APPARATUS FOR READING AND IDENTIFYING THE PROFILE OF A KEY

Abstract

The invention relates to an apparatus (1) for reading the profile of a key (5) defined by a head portion (5) and a shank portion (5). Such an apparatus comprises a lighting chamber (60) provided with an inlet section (9) for inserting said key and an optical device (50) operatively associated with the chamber (60). The optical device (50) defines an optical axis (200) and is configured to capture at least one image of the profile. The apparatus (1) further comprises a support device (10) which defines a bearing plane (100) for at least one segment of said key (5), in which such a bearing plane (100) is parallel to said optical axis (200). The apparatus further comprises a lighting device configured to illuminate at least one terminal part of the key shank once it has been inserted into the chamber (60).

Claims

1. An apparatus for reading the profile of a shank portion of a key said shank portion comprises at least one terminal part, said apparatus being characterized in that it comprises: a chamber provided with an inlet section for the insertion of at least one segment of said shank portion; an optical device operatively associated with said chamber, said optical device defining an optical axis and being configured to capture an image comprising at least one view of said profile; a support device which defines a bearing plane for at least one segment of said key, said optical axis being parallel to said bearing plane; a lighting device operatively associated with said chamber and configured to illuminate said at least one terminal part of said shank portion, wherein said lighting device comprises: a first source of scattered light operatively associated with said chamber and configured to illuminate a first side of said shank portion comprised between a first face resting on said bearing plane and a second face opposite to said first face; a second source of scattered light operatively associated with said chamber and configured to illuminate a second side of said shank portion opposite to said first side.

2. An The apparatus according to claim 1, wherein said optical device is a telecentric lens.

3. The apparatus according to claim 1, wherein said sources of scattered light extend mainly along a reference direction parallel to said optical axis.

4. The apparatus according to claim 1, wherein said apparatus comprises dimming means of said inlet section configured to limit, at least during the activation of said light sources, the entry of light in said chamber.

5. An The apparatus according to claim 1, wherein said apparatus comprises positioning means of said key configured to define a limit position of insertion of said key in said chamber and/or alignment means of said key which define an orientation direction of said key.

6. The apparatus according to claims 1, wherein said apparatus comprises a closure device comprising a pair of walls of which at least one wall is movable along a direction parallel to the bearing plane and orthogonal to the optical axis, said at least one of said walls being subjected to the thrust of an elastic element which acts so as to draw up the walls themselves, said walls being configured to interact with a corresponding side of said key during the insertion thereof.

7. The apparatus according to claim 1, wherein said support device comprises: a bearing element having a flat surface which defines said bearing plane; a blocking element which is opposite to said bearing element with respect to said bearing plane, said blocking element blocking said key against said flat surface.

8. The apparatus according to claim 1, wherein said chamber comprises a first side wall to which said first source of scattered light is connected and a second side wall to which said second source of scattered light is connected, said side walls being configured so that at least the corresponding inner surface extends on a plane parallel to the optical axis and orthogonal to the bearing plane.

9. The apparatus according claim 1, wherein said chamber comprises a first transverse wall which extends in a position above the bearing plane and a second transverse wall which extends in a position below said bearing plane, one between said first transverse wall and said second transverse wall being made of reflective material, the other being made of non-reflective material.

10. The apparatus according to claim 9, wherein said lower wall and said upper wall are made of a translucent material.

11. The apparatus according to claim 9, wherein said transverse walls extend between said side walls.

12. The apparatus according to claim 9, wherein at least one inner surface of said first transverse wall is inclined at a first angle (1) with respect to the bearing plane, said inner surface extending on a plane which diverges from said bearing plane in the direction of said optical device.

13. The apparatus according to one of claims 9, wherein at least one inner surface of said second transverse wall is inclined at an angle (2) with respect to the bearing plane, said inner surface extending on a plane which diverges from said bearing plane in the direction of said optical device.

14. An The apparatus according to claims 1, wherein said apparatus comprises an openable casing that defines an internal, volume in which a support structure is placed, said chamber being installed on a support connected in removable manner to said support structure.

Description

LISTING OF DRAWINGS

[0021] Further features and advantages of the present invention will become more apparent from the following detailed description, provided by way of non-limiting example and shown in the accompanying drawings, in which:

[0022] FIG. 1 is an image comprising a view of a first key and a view of the profile of the key itself which may be read and identified through an apparatus according to the present invention:;

[0023] FIG. 1A is a view of a key blank having the same profile as the key in FIG. 1, and length compatible with it;

[0024] FIGS. 2 to 6 are images of certain types of keys, the profile of which may be read and identified through an apparatus according to the present invention;

[0025] FIGS. 7 and 8 are diagrammatic cross-section views of a device according to the present invention;

[0026] FIG. 9 is a diagrammatic view of a group of components of an apparatus according to the invention;

[0027] FIG. 10 shows an example of image which can be captured by an optical device of an apparatus according to the invention;

[0028] FIG. 11 and 12 are a first view and a second view, respectively, of a possible embodiment of an apparatus according to the invention;

[0029] FIG. 13 is a perspective view of a first group of components of the apparatus shown in FIGS. 11 and 12;

[0030] FIG. 14 is an exploded view of a second group of components of the apparatus shown in FIGS. 11 and 12.

DETAILED DESCRIPTION

[0031] The present invention relates to an apparatus 1 for reading the profile of a key 5, for example for locks or for motor vehicles. With reference to FIG. 1, a key 5 generically comprises a head portion 5 (or head 5) and a shank portion 5 (or shank 5) connected to the head portion 5. The shank 5 is defined by a first face 8 and a second face 8 (indicated in FIG. 7), opposite to each other. A first side 7 of the shank 5 and a second side 7, opposite to said first side, is defined between such faces 8, 8. For the purposes of the present invention, the distance between said faces 8, 8 is defined thickness (indicated with S) of the shank 5. The shank 5 further comprises a terminal part 3, this meaning the free end (or tip) of the shank 5, opposite to the head 5.

[0032] The apparatus 1 according to the invention is configured to read the profile and thus identify different types of keys, such as for example the standard type shown in FIG. 1, which has one cut side 7 and a stop portion 4 (or even stop 4). FIG. 1a instead shows a key blank having a profile (indicated with P1) corresponding to that of the key in FIG. 1 (indicated with P). The length of the key in FIG. 1A also is compatible with that in FIG. 1. FIGS. 2 and 3 show keys 5 for motor vehicles and the related profiles P of the shank 5. In particular, the key in FIG. 3 comprises two cut sides 7, 7, each of which defines a stop portion 4. FIG. 4 refers to a key for safes, while FIG. 5 is a view of a key without a stop, with two cut sides. FIG. 6 instead shows a notched key with two stops 4 defined on the two sides 7 7of the shank 5. The keys shown in FIGS. 1 to 6 are only possible, non-limiting examples of keys, the profile of which may be identified through the apparatus according to the invention.

[0033] FIGS. 7 and 8 are diagrammatic views of an apparatus I according to the invention, which comprises an optical device configured to capture at least one image of the profile of the shank 5of said key 5. The optical device defines an optical axis 200 which maintains a fixed position during the normal use of the apparatus 1. The device for capturing images preferably comprises a telecentric lens 50 to which reference will be made in the following description for simplicity only. However, the possibility of using other functionally equivalent optical devices falls within the scope of the present invention.

[0034] The apparatus 1 according to the invention comprises a chamber 60 operatively associated with the telecentric lens 50. The chamber 60 comprises an inlet section 9 through which is inserted the key 5, the profile of which is to be read/identified. Such an inlet section 9 is preferably defined through a bottom wait 68 of the chamber itself. Such a bottom wall 68 is preferably defined in a dark, opaque and non-reflective material. The telecentric lens 50 is installed in a position which is substantially in front of the inlet section 9, i.e. opposite to the bottom wall 68. As is shown in FIG. 8, the key 5 is inserted into the chamber 60 with the terminal part 3 (or end 3) of the shank 5 facing towards the telecentric lens 50. In this manner, the telecentric lens 50 captures an image comprising at least one front view of the profile of the shank 5substantially corresponding to the projection of the portion itself onto a reference plane 300 which is substantially perpendicular to the optical axis 200.

[0035] With reference to FIG. 7, the apparatus 1 according to the invention comprises a support device of the key 5, which defines a bearing plane 100 on which the key 5 at least partially rests. Such a bearing plane 100 is substantially parallel to the optical axis 200 of the telecentric lens 50. As is better specified below, the support device preferably comprises first blocking means configured to block the key 5 on the bearing plane 100.

[0036] With reference to FIG. 8, according to the invention, the apparatus 1 comprises a lighting device operatively associated with the chamber 60 and configured to illuminate, following the activation thereof, at least one terminal part 3 of the portion of the shank 5. Unlike the solution described in WO 2008/071619, the lighting device of the apparatus 1 according to the invention does not create a white background at the head of the key and/or below the bearing plane of the key, but contrarily serves the purpose of illuminating/scattering light onto at least one terminal part 3 of the shank 5. In this manner, the image captured by the telecentric lens 50 comprises a front view of the profile of the portion of the shank 5 which appears light against a dark background. In this regard, FIG. 10 shows an example of an image which can be captured by the telocentric lens. Such an image comprises a first front view 71 of the profile of the shank portion and a second view 72 reflected onto an upper wall 65 of the chamber 60, as described below in detail.

[0037] According to a preferred embodiment shown in the drawings, the lighting device comprises a first source 21 of scattered light and a second source 22 of scattered light placed in fixed position inside the chamber 60 and configured to illuminate two opposite sides 7, 7 of the shank 5. In this manner, direct illumination, and not backlit illumination, of the key shank is obtained. Namely, the first source 21 is configured to illuminate/scatter the light onto a first side 7 of the shank 5, while the second source 22 is configured to illuminate a second side 7, opposite to said first side 7. For this purpose, the sources 21, 22 are arranged, with respect to the bearing plane 100, so as to face the sides 7, 7 of the shank 5 once the key 5 has been inserted into the chamber 60, as shown in FIG. 8. For the purposes of the present invention, the expression scattered light is used to indicate the capacity of the two sources 21, 22 to scatter the light radiation in a substantially homogeneous manner according to various directions.

[0038] The two sources 21, 22 (or light sources 21, 22) are each arranged along a reference direction 101 which is parallel to the optical axis 200. Preferably, the two light sources 21, 22 extend for the whole length of the chamber 60, which length is assessed according to a direction parallel to the optical axis 200. Again according to a preferred embodiment, the two light sources 21, 22 are also arranged in a specular position with respect to a reference plane 109 (indicated in FIG. 6) containing the optical axis 200 and orthogonal to the bearing plane 100 of the key.

[0039] According to a possible embodiment schematized in the drawings, the two light sources 21, 22 are each defined by a plurality of LEDs 21, 22 aligned according to a row which defines the corresponding reference direction 101 indicated above. Preferably, each light source 21, 22 comprises scattering means of the light operatively associated with the corresponding plurality of LEDs 21, 22 for scattering the light generated by the LEDs themselves. With reference to FIG. 8, according to a preferred embodiment, such scattering means comprise, for each source 21, 22, a wall 61, 62 made of translucent material in which the corresponding LEDs 21, 22 are partially inserted.

[0040] In an alternative embodiment, the light sources 21, 22 could be defined by one LED or alternatively by a pair of LCD strips arranged on opposite sides of the chamber 60 in symmetrical position with respect to the above-defined reference plane 109. In all cases, according to the invention, the two light sources 21, 22 are configured in the shape of light strips, bands or walls arranged on opposite sides of the chamber 60 so as to illuminate opposite portions of the shank 5.

[0041] According to a preferred embodiment, the light sources 21, 22 are arranged above the bearing plane 100 of the key 5 so as to scatter the light generated mainly in a reference volume V defined between the bearing plane 100 itself and a reference plane 119 parallel to the bearing plane 100 (see the diagram in FIG. 8). In particular, the reference plane 119 is such that the distance between the two planes involved (100, 119) is less than or equal to the maximum thickness Smax allowed for the shank 5 assessed in reference to the area of the inlet section 9. According to such an arrangement, in the diagram in FIG. 8 for example, the LED rows defining the two light sources 21, 22 are installed at a height from 2 to 5 mm from the bearing plane 100, considering a maximum thickness of 6 mm for the shank portion 5. Alternatively, when the light source is defined by a light strip or band, the latter is configured so as to have a height, assessed with respect to the bearing plane 100, at least equal to the above-defined maximum thickness Smax.

[0042] In general, through the above-described arrangement, the light generated by the light sources 21, 22 is reflected from the sides 7, 7 of the shank 5. The light which hits the terminal part 3 of the shank portion 5 is reflected towards the telecentric lens 50. As a whole, due to the illumination defined in the chamber 60, the image of the shank 5 captured by the telecentric lens 50 is advantageously light against a dark background, as shown in FIG. 10. It is worth noting that this principle is entirely contrary to that at the basis of the technical solution described in the patent application WO 2008/071619 and allows a more effective identification of the profile of the key 5, as better specified below. The principle of illumination implemented in the apparatus 1 according to the invention is advantageously valid and effective even when tip 3 of the key is rounded or chamfered.

[0043] According to the invention, the chamber 60 of the apparatus 1 is configured so as to be dark to the reference radiation of the light sources 21, 22, or more generally, of the lighting device employed. In other words, the chamber 60 is configured so as not to have light radiations in the reference band of the light sources/lighting device other than the light sources 21, 22 themselves.

[0044] According to a possible preferred embodiment, the two light sources 21, 22 generate infrared light. It has been shown how this solution ensures capturing a sharp image regardless of the color of the shank portion 5 of the key examined. Moreover, the infrared radiation stands out for a slight or even non-existent wavelength in the work environments in which an apparatus for reading the profile of a key is typically used. This means that any radiations which cross the inlet section 9 in fact have no effect on the illumination of the shank 5 and accordingly on the quality of the image captured by the telecentric lens 50. However, the possibility of using other functionally equivalent light sources 21, 22 capable of emitting light having various wavelengths as visible or UV, falls within the scope of the present invention. In the case indicated above in which the two light sources 21, 22 generate infrared light, an IR-pass filter (this term meaning a filter capable of passing only IR radiation) is preferably mounted on the telecentric lens 50.

[0045] FIGS. 11 to 14 show a preferred embodiment of the apparatus 1 according to the present invention. The apparatus 1 comprises a casing which defines an internal volume in which a support structure 95 is arranged, configured to support the chamber 60 and the telecentric lens 50. The apparatus 1 further comprises an electronic unit 150, also preferably arranged inside the volume of the casing. Such an electronic unit 150 is operatively connected to the telecentric lens 50 and also preferably to the lighting device (light sources 21, 22) to control the activation/deactivation thereof. The electronic unit 150 and the lighting device are powered by supply means 155 which can be connected to an electric network or alternatively in the form of electric batteries.

[0046] With reference to FIG. 11, the casing of the apparatus 1 is defined at least by a first portion 90 and by a second portion 90 removably connected to the first portion 90. In this manner, the apparatus is substantially openable. The first portion 90 defines the bottom wall 68 of the chamber 60 through which is defined the insertion section 9 of the key 5 to be examined. The casing 90 defines a resting base 91 for the apparatus 1.

[0047] With reference to FIG. 13, according to an embodiment, the chamber 60 is mounted on a support 93 removably connected to the support structure 95 placed in the internal volume defined by the casing 90. The removable connection between the portions 90, 90 of the casing and the use of the removable support 65 advantageously facilitate the inspection, maintenance and possibly replacement operations of the chamber 60.

[0048] With reference again to FIGS. 7 and 8, the apparatus 1 according to the invention preferably comprises dimming means of the inlet section 9 operatively arranged close to the section itself. Such means are configured to at least partially prevent the inlet of light radiations from the outside into chamber 60 during the activation of the lighting device, such as for example, reflections which may be fanned on the head 5 of the key 5. For the purposes of the present invention, the term outside means natural or artificial light in any case generated outside the chamber 60 and in the reference band generated by the lighting device. The dimming means substantially limit the generation of stray light inside the chamber 60, the presence of which could cause a reduction in the quality of the image captured by the image capturing device 50.

[0049] The apparatus 1 according to the invention preferably comprises positioning means of the key 5 configured to define a physical limitation to the insertion of the key itself into the chamber 60 and/or alignment means for aligning the key during the insertion along a substantially parallel direction to the optical axis 200. The positioning means substantially define a limit insertion position in the key 5, so that the head 5 remains substantially outside the chamber 60. The alignment means instead define a direction of orientation for the >key 5. According to a preferred embodiment, the positioning means and the alignment means are defined by a surface on which the stop portion 4 of the key 5 rests in abutment during the insertion of the key. Such an abutment defines a limit position for the insertion of the key and at the same time determines an orientation of the key itself.

[0050] With reference to FIGS. 7, 8 and 14, the dimming means, the positioning means and the alignment means defined above are advantageously integrated in a closure device. Such a device is operatively arranged close to the inlet section 9 and preferably downstream of the section itself with respect to the insertion direction of the key 5. With reference to FIGS. 7 and 8, the closure device comprises at least one pair of substantially coplanar walls 31, 32, of which at least a first wall 31 is movable along a sliding direction 400 (FIG. 8) parallel to the bearing plane 100 and orthogonal to the optical axis 200. Namely, such a first wall 31 is movable in contrast with an elastic element 35 which exerts a force which moves the first wall 31 close to the second wall 32. In an alternative embodiment (not shown), both the walls 31, 32 are movable along said sliding direction 400 in contrast with a corresponding elastic element 35. Each or the walls 31, 32 constantly interacts with a corresponding side 7, 7 of the key 5 during the insertion thereof; due to the elastic elements 35. This results in a closure of the side space between the sides 7, 7 and the sides of the inlet section 9. Such a closure prevents the light from crossing such a side space.

[0051] With reference to FIG. 14, according to a possible embodiment, the first movable wall 31 slides inside a seat 31 defined by the bottom wall 68 of the chamber 60. Such a first wall 31 moves in contrast with two elastic elements 35 accommodated in the seat 31 itself. The second wall 32 is instead fixed and defined by a portion of the bottom wall 68 itself.

[0052] The two walls 31, 32 comprise an inner surface 36 which faces the chamber 60, or more generically faces the telecentric lens 50, and an outer surface 37 opposite to the inner surface 36. According to the invention, the inner surface 36 is not reflective for the purposes of absorbing the light radiation and therefore for preventing the head 5 and the stop 4 of the key 5 from being visible to the telecentric lens 50. In fact, the inner surface 36 is not reflective in order to increase the quality of the image captured by the telecentric lens 50.

[0053] The outer surface 37 of at least one of the walls 31, 32 instead forms the abutment for a stop portion 4 of the key 5. Due to such an abutment, the shank 5 is positioned inside the chamber 60, while the head portion 5 advantageously remains outside the chamber itself. This means that the head 5 advantageously remains excluded from the image captured by the telecentric lens 50. When the key has a dual stop 4 (see for example FIGS. 2, 3 and 6), then the outer surface 37 of both walls 32, 32 defines an abutment for a corresponding stop.

[0054] With reference again to FIGS. 7, 8 and 14 the support device comprises a bearing element 11 having substantially prismatic configuration, provided with a flat surface 11 defining the bearing plane 100. Preferably, the bearing element 11 is placed downstream of the above-described closure device, again with respect to the insertion direction of the key 5. In this manner, only the shank portion 5 or a first segment thereof rests on the flat surface 11. In particular, the bearing element is placed in position adjacent to the walls 31, 32 of the closure device. However, the possibility of placing the support device upstream of the closure device falls within the scope of the present invention.

[0055] Preferably, the flat surface 11 of the bearing element I l has an axial extension, i.e. assessed along a direction parallel to the optical axis 200, in the range from 5 to 15 mm. In this manner, at the end of the insertion of the key 5, at least one segment of the shank 5 advantageously will overhangingly emerge inside the chamber 60. It has been shown that such an overhanging arrangement improves the definition of the image captured by the telecentric lens 50.

[0056] In the embodiment shown in FIGS. 7, 8 and 14, the support device comprises a mechanical blocking element 12 which is movable in contrast with an elastic element 8 along a substantially orthogonal direction to the flat surface 11 of the bearing element 11. The blocking element 12 exerts a constant pressure on the key 5 through the elastic element 18, preferably on the shank portion 5 which keeps the same against the flat surface 11. Preferably, the blocking element 12 is defined by a cylindrical body on which the elastic element 18 acts, for example in the form of a spring.

[0057] In an alternative embodiment, the blocking clement 12 could have a similar configuration to that of the bearing element 11. Further constructional variants of the blocking element however are to be considered as falling within the scope of the present invention.

[0058] According to a further aspect, at least the surfaces of the bearing element 11 and of the blocking element 12 facing the telecentric lens 50 are made of a non-reflective material in order to absorb the light scattered by the light sources 21, 22 to the greatest extent possible, i.e. in order to increase the quality of the image captured by the telecentric lens 50.

[0059] Preferably, the bearing element 11 comprises a pair of non-reflective chamfer surfaces 13, 13 (FIG. 7 and FIG. 9) defined at the flat surface 11. A first chamfer surface 13, facing the inlet section 9, serves the function of facilitating the insertion of the key 5, thus preventing the abutment of the key against the bearing element 11. The other chamfer surface 13, facing towards the telecentric lens 50, instead serves the purpose of avoiding the reflection of the light towards the telecentric lens 50 itself, at the height of face 8.

[0060] It is worth noting that the same effects obtained by the chamfer surfaces 13, 13 in the blocking element 12 are achieved due to the cylindrical shape assigned to the body of the element itself. The second chamfer surface 13 and the cylindrical shape of the blocking element 12 as a whole generally define shielding means of the support device 10 configured to prevent the reflection of the light towards the telecentric lens 50 close to the surfaces 8, 8 of the shank 5 in contact with the device 10 itself.

[0061] As shown in FIG. 7, the bearing element 11 defines the bearing plane 100 by being placed in a position below the plane itself. The blocking element 12 instead is placed in the opposite position, i.e. above the plane itself. However, the position of the two elements (11, 12) could be inverted.

[0062] It is worth noting that in light of the principle of illumination implemented in the apparatus 1 according to the invention, the elements of the support device may advantageously be made of metal material to the benefit of increased resistance against wear, and decreased costs.

[0063] With reference to FIGS. 8, 13 and 14, the chamber 60 comprises a first side wall 61 and a second side wall 62, opposite to the first wall 61. With reference to FIG. 8, a first row of LEDs 21 (first light source 21) is operatively connected to the first wall 61, while a second row of LEDs 22 (second light source 22) is connected to the second wall 62. In particular, the LEDs are at least partially inserted into the structure of the corresponding walls 61, 62. Preferably, the two side walls 61, 62 extend over planes parallel to the optical axis 200 and orthogonal to the positioning plane 100. Such walls 61, 62 are preferably made of translucent material, such as for example Plexiglas, to scatter the light generated by the LEDs towards the shank 5 and also to an upper wall 65 of the chamber 60 defined below.

[0064] With reference again to FIGS. 8, 13 and 14, the chamber 60 preferably also comprises a first transverse wall 65 (or upper wall 65) which extends between the side walls 61, 62 above the bearing plane 100. Preferably, the chamber 60 also comprises a second transverse wall 66 (or lower wall 66) which extends between the side walls 61, 62 in a position below the bearing plane 100. Namely, such a lower wall 66 extends from a minimum distance from the bearing plane 100 to avoid collisions with the key 5 during the insertion of the key into the chamber 60.

[0065] According to the invention, the inner surface 65 of one of the two walls mentioned (preferably the upper wall 65) is made of a reflective translucent material, while the inner surface 66 of the other wall (preferably the lower wall 66) is made of a non-reflective translucent material. In particular, the use of a translucent material for both the inner surfaces 65, 66 mentioned advantageously allows the terminal part 3 of the shank 5 to be effectively illuminated also when a key has a rounded/chamfered end/tip. The use of a reflective material for at least one of the two inner surfaces instead allows a reflected view of the shank 5 to be obtained on such a surface according to the above description.

[0066] With reference to the diagram in FIG. 5, according to a further aspect, the inner surface 65 of the upper wall 65 is preferably inclined by an angle 1 with respect to the bearing plane 100. Such a solution advantageously allows the telecentric lens 50 to capture an image which comprises a further view (reference 72 in FIG. 10) of the shank 5 reflected onto the inner surface 65 of the upper wall 65. The length of the shank 5, and therefore a further piece of information related to the morphology of the shank 5 being examined, and in particular of the terminal portion 3, may advantageously be estimated from such a further view. The surface 65 advantageously substantially allows an image to be captured which contains two points of view (view of the profile and reflected view) of the shank portion 5.

[0067] According to an alternative embodiment, the inner surface 66 of the lower wall 66 is also inclined with respect to the bearing plane 100, in an opposite direction to the inner wall 65 of the upper wall 65 and namely, so that the two surfaces 65, 66 extend over planes which diverge in the direction of the telecentric lens 50. The surface 66 is inclined, with respect to the bearing plane 100, by a second angle 2 with respect to the bearing plane 100. Due to such an inclination, the lower wall 66 is not an impediment to the insertion of the key 5 through the inlet section 9. At the same time, such an inclination avoids the lower wall 66 itself from being scratched by the shank portion 5. Moreover, the inclination of the inner surface of the lower wall 66 also allows the downwards deposition of possible dirt.

[0068] Other possible embodiments of the upper wall 65 and/or of the lower wall 66 are in any case to be considered as falling within the scope of the present invention. For example, the lower wall may extend over a plane spaced apart from and parallel to the bearing plane 100 (angle .sub.2 null). Likewise, the upper wall 65 could also extend over a plane spaced apart from and parallel to the bearing plane 100 (angle .sub.1 null). In this case, the telecentric lens 50 could capture an image in fact comprising only a front view of the profile of the shank portion 5.

[0069] The operating principle of the apparatus shown in FIGS. 7 to 14 is described below, assuming to examine a key with a single cut side and provided with a stop, like that shown in FIG. 1. It is understood that the apparatus 1 itself may in any case be used to identify other types of keys, such as for example those shown in FIGS. 2 to 6. The switching on of the apparatus 1 causes the activation of the light sources 21, 22 and therefore the illumination of the chamber 60. The key 5 to be examined is inserted into the inlet section 9 up to reaching an operating position established by the abutment of the stop 4 of the key 5 against at least one of the vertical walls 31, 32 of the closure device. In such a position, the head portion 5 of the key 5 remains outside the chamber 60. The shank portion 5 instead emerges overhangingly inside the chamber itself due to the configuration of the support device. In greater detail, only a first segment of limited extension of the shank 5 rests against the flat surface 11 of the support element 11. The blocking element 12 of the support device acts on such a first segment, which element 12 stably blocks the <key 5 during the reading of the profile.

[0070] The shank portion 5 is illuminated by the two light sources 21, 22 arranged on opposite sides of the chamber 60 according to the principles indicated above. The telecentric lens 50 captures at least one image comprising a front view of the profile of the key 5 and a further view of the shank portion reflected onto the inner surface 65 of the upper wall 65 of the chamber 60. Such an image advantageously is displayed on a screen 111 or display (FIG. 10) of the apparatus 1 (FIG. 11). It is worth noting that such a display allows an operator to intervene on the head portion 5 of the key to correct the orientation of the shank 5 inside the chamber 60, This need could occur for example, in the ease of a key without a stop (for example, like those shown in FIGS. 4 and 5), for which the abutment, and therefore the alignment allowed by the walls 31, 32 of the closure device, may not be taken advantage of.

[0071] As indicated above, due to the configuration of the chamber 60 and due to the arrangement of the light sources 21, 22 and the reflection of the light onto the key 5, a direct illumination, and not a backlit illumination, is obtained whereby the front view of the profile of the shank 5 in the image captured by the telecentric lens 50 always appears light against a dark background. Due to the position of the light sources which partially or totally illuminate the sides 7, 7 of the shank 5, the reflection of the light towards the telecentric lens may be taken advantage of, a reflection which occurs at the inclined surfaces of shank 5.

[0072] The processing unit 150 of the apparatus 1 processes the image captured by the telecentric lens 50, thus obtaining a reference profile of the shank 50. Such a reference profile is compared, through a comparison algorithm, with a series of profiles saved in a database, to each of which an identification code is assigned. Following the occurrence of a correspondence between the reference profile and one of those saved in the database, the processing unit 150 displays the identification code assigned to the profile saved, on the display 111. In this manner, the operator may track down the key blank (see FIG. 1A) by taking advantage of the identification code assigned to the profile. The operator therefore may proceed with duplicating the key.

[0073] As indicated above, the image of the telecentric lens 50 also comprises a view of the shank 5 reflected onto the inner surface 65 of the upper wall 65 of the chamber 60. The processing unit 150 processes this information by advantageously estimating the length of the shank 5 according to the geometrical features of the chamber 60 (extension along an axis parallel to the optical axis, inclination of the angle of the inner surface 65, etc.) and according to the position of the stop 4 of the key 5 known due to the abutment against the walls 31, 32 of the closure device.

[0074] The technical solutions implemented for the apparatus according to the present invention allow the preset task and objects to be completely achieved. In particular, the apparatus is versatile because it may identify the profile of various types of keys. The use of a lighting device configured to scatter the light over the key shank allows a high quality image to be obtained without affecting the complexity of the other parts of the apparatus.