Workpiece referencing system for referencing workpieces

Abstract

A workpiece referencing system, the system having a workpiece support assembly for supporting a plurality of workpieces, wherein the support assembly includes a support platform and a plurality of support members which are disposed to the support platform, each support member being configured to support an individual workpiece; and a workpiece referencing assembly for referencing the workpieces, as supported by the support assembly, to predetermined positions; wherein the support members each includes a body which includes a support surface which supports a workpiece and a resilient coupling which resiliently couples at least an upper part of the body relative to the support platform, such that the at least part of the body is displaceable relative to the support platform from a first, unbiased position to a second, biased reference position by operation of the referencing assembly, and, when released, the at least part of the body returns to the first, unbiased position.

Claims

1. A workpiece referencing assembly for referencing workpieces, as supported by support members of a support assembly, to predetermined positions, wherein the referencing assembly comprises a horizontal referencer for referencing the workpieces to the predetermined positions in a horizontal orient, wherein the horizontal referencer comprises a horizontal referencing unit which comprises at least one horizontal referencing member which includes a plurality of referencing surfaces which are arranged in correspondence to the support members such as to engage the workpieces as supported by the respective support members when the at least one horizontal referencing member is moved in the horizontal orient, wherein the horizontal referencing unit comprises first and second horizontal referencing members which are arranged in correspondence to the support members, and wherein the horizontal referencing members each comprise a plate element which includes a plurality of apertures which each define at least one referencing surface.

2. The assembly of claim 1, wherein the referencing surfaces each comprise at least one elongate edge or discrete contact point, or a plurality of elongate edges or discrete contact points.

3. The assembly of claim 2, wherein the contact point or points comprise resilient elements.

4. The assembly of claim 3, wherein the contact point or points comprise elastomeric or rubber elements.

5. The assembly of claim 3, wherein the contact point or points comprise spring elements.

6. The assembly of claim 5, wherein the contact point or points comprise helicoidal or leaf springs.

7. The assembly of claim 1, wherein at least one horizontal referencing member is moved along an axis which is inclined to at least one edge of the workpieces.

8. The assembly of claim 7, wherein the workpieces have orthogonal edges, and the at least one horizontal referencing member is moved in a direction intermediate the two orthogonal edges.

9. The assembly of claim 1, wherein the horizontal referencing members are movable in different directions, such as to engage the workpieces as supported by the respective support members when the horizontal referencing members are moved in a horizontal orient.

10. The assembly of claim 9, wherein the horizontal referencing members are moved in substantially opposite directions.

11. The assembly of claim 9, wherein one of the horizontal referencing members includes apertures of fixed shape which are oversized relative to the size of the workpieces, at least one edge of which includes a first referencing surface, and the other of the horizontal referencing members includes counterpart apertures, at least one edge of which includes a projection which extends into the respective apertures in the one horizontal referencing member and provides a second referencing surface, whereby movement of the first and second horizontal referencing members acts to engage the workpieces by the first and second referencing surfaces and position the workpieces in predetermined referencing positions.

12. The assembly of claim 1, wherein the referencing assembly comprises a vertical referencer which is operative to reference the workpieces as supported by the support members to a common height.

13. The assembly of claim 12, wherein the vertical referencer comprises a vertical referencing member which is in use disposed at a predetermined height above the support assembly and acts to reference the workpieces as supported by the support members to a common height.

14. The assembly of claim 13, further comprising: a transport mechanism for moving the vertical referencing member from a first, storage position to a position above the support assembly.

15. The assembly of claim 14, wherein the transport mechanism comprises a support cradle which supports the vertical referencing member, a pivotable linkage which is coupled to the support cradle and acts to translate the support cradle between the inoperative and operative positions, and an actuator which is operable to move the support cradle between the inoperative and operative positions.

16. The assembly of claim 15, wherein the support cradle comprises first and second arms which engage lateral edges of the vertical referencing member and a body which supports the arms in fixed relation, optionally the arms are cantilevered from the body.

17. The assembly of claim 1, wherein the workpieces comprise a plurality of workpiece elements which are supported by a common carrier element.

18. A workpiece referencing system incorporating the assembly of claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Preferred embodiments of the present invention will now be described hereinbelow by way of example only with reference to the accompanying drawings, in which:

(2) FIG. 1 illustrates a perspective view of a workpiece referencing system in accordance with a preferred embodiment of the present invention, with the workpiece support assembly and the workpiece referencing assembly thereof omitted for ease of illustration;

(3) FIG. 2 illustrates a perspective view of the workpiece support assembly of the workpiece referencing system of FIG. 1;

(4) FIG. 3 illustrates a vertical sectional view (along section I-I) of the workpiece support assembly of FIG. 2;

(5) FIG. 4 illustrates a perspective view of the workpiece referencing assembly of the workpiece support system of FIG. 1;

(6) FIG. 5 illustrates an enlarged perspective view (detail A) of the workpiece referencing assembly of FIG. 4; and

(7) FIGS. 6(a-j) illustrate the operative steps in use of the workpiece support system of FIG. 1.

DESCRIPTION OF PREFERRED EMBODIMENTS

(8) The workpiece referencing system comprises a workpiece support assembly 3 for individually supporting a plurality of workpieces W which are transported in singulated fashion in a workpiece carrier 7, and a workpiece referencing assembly 11 for referencing the workpieces W, as supported by the support assembly 3, each to predetermined positions.

(9) In this embodiment the workpiece carrier 7 comprises a plurality of carrier units 15, which support individual workpieces W in spaced relation. In this embodiment the carrier units 15 are arranged in a regular array, typically in an m×n array, here in a 3×7 array, but could have any arrangement. In this embodiment the workpiece carrier 7 is JEDEC style carrier or boat, but could have any other style, such as an Auer style.

(10) The support assembly 3 comprises a base unit 17 and a support module 19 which is disposed to the base unit 17. In this embodiment the support module 19 is a removable, replaceable module, which allows for the use of different support modules 19 and thereby accommodates the use of different workpiece carriers 7 and workpieces W without requiring replacement of the entire support assembly 3.

(11) In this embodiment the base unit 17 includes a manifold cavity 20 in an upper surface thereof, to which a platform 21 of the support module 19 is fluidly connected. As will be described in more detail hereinbelow, the manifold cavity 20 is fluidly connected to a vacuum or reduced pressure source 85. With this configuration, individual connections to support members 23 of the support module 19 are not required, and the support module 19 can be removed as an integral assembly.

(12) The support module 19 comprises a support platform 21 and a plurality of support members 23 which are disposed to the support platform 21, each being configured to support an individual workpiece W.

(13) In this embodiment the support members 23 are arranged in a regular array, typically in an m×n array, here in a 3×7 array, which corresponds to the configuration of the carrier units 15 of the workpiece carrier 7, but could have any arrangement.

(14) In this embodiment the support platform 21 comprises a platform body 25, here in the form of a plate, which has upper and lower surfaces 27, 29 and includes a plurality of bores 31 which each receive a respective support member 23 and are configured in accordance with the arrangement of carrier units 15 in the workpiece carrier 7.

(15) In this embodiment the platform body 25 comprises an upper body element 41 and a lower body element 43, which together define a cavity 45, which extends laterally across the platform body 25 and receives a locking member 51, as will be described in more detail hereinbelow.

(16) In this embodiment the support platform 21 further comprises a locking member 51, which is operative to lock the vertical or Z-axis height of the support members 23.

(17) In this embodiment the locking member 51, here in the form of a plate, includes a plurality of apertures 53 which are arranged in correspondence with the plurality of bores 31 in the platform body 25, and is actuatable between a first, unlocked or rest position, in which the support members 23 are movable vertically, such as to allow adjustment of the height of the support members 23, and a second, locked position in which the locking member 51 engages a part of the support members 23, in this embodiment stems 77 of the support members 23, and locks the vertical or Z-axis height of the support members 23.

(18) In this embodiment the locking member 51 includes a plurality of contact elements 54, here in the form of resilient elements, such as a rubber or elastomeric pad, which are disposed at the respective apertures 53, such as to provide a contact surface with the respective support member 23 when the locking member 51 is in the locked position.

(19) In this embodiment the support platform 21 further comprises a biasing element 55, here a spring element, which acts to bias the locking member 51 to the unlocked position when the locking member 51 is not actuated. With this configuration, the locking member 51 automatically adopts the unlocked position without requiring any separate actuation or intervention.

(20) In this embodiment the support module 19 comprises an integral module which is removable from a processing machine, such as a screen printing machine, as a single unitary module.

(21) In this embodiment the support module 19 is re-configurable, such that the support members 23 can be arranged in any desired configuration and additionally or alternatively allows different support members 23 to be fitted to the support platform 21.

(22) The support members 23 each comprise a base 56 which is attached to the support platform 21, a body 57 which is movably coupled to the base 56, in this embodiment at least in the vertical or Z-axis orient, and a biasing element 59 which acts to bias the body 57 away from the base 56, and the support platform 21 on which the base 56 is mounted, in this embodiment upwardly, such as to allow for depression of the body 57 from an unbiased or rest position and return the body 57 to the unbiased position on releasing the bias as applied to the body 57.

(23) In this embodiment the body 57 comprises a first, lower body part 61 and a second, upper body part 63, at least part of which is movably coupled to the lower body part 61, here at least in a horizontal or X-Y plane and preferably allowing for rotation θ relative to the vertical or Z-axis.

(24) In this embodiment the upper body part 63 includes a head 64 which provides a support surface 65 for supporting a workpiece W.

(25) In this embodiment the body 57 further comprises a resilient coupling 75 which resiliently couples the upper body part 63 to the lower body part 61, such that the upper body part 63 is displaceable in a horizontal orient relative to the lower body part 61, and the support platform 21 to which the lower body part 61 is coupled, from a first, unbiased position to a second, biased reference position by operation of the referencing assembly 11, as will be described in more detail hereinbelow, and, when released, the upper body part 63 returns to the first, unbiased position.

(26) In this embodiment movement of the upper body part 63 relative to the lower body part 61 is constrained such that the support member 23 provides a stable support to the supported workpiece W.

(27) With this configuration, the workpieces W are each individually referenced to a reference position and each returns to their original position without any control input on releasing the workpieces W, thus allowing for the workpieces W to be engaged directly in the carrier units 15 of the workpiece carrier 7 without any positional adjustment by simply raising the workpiece carrier 7 in relation to the supported workpieces W, which can be done by raising the workpiece carrier 7 with the support module 19 fixed, lowering the support module 19 with the workpiece carrier 7 fixed or both raising the workpiece carrier 7 and lowering the support module 19.

(28) In this embodiment the resilient coupling 75 comprises an elastomeric or rubber element, which is deflected on displacement of the upper body part 63.

(29) In one embodiment the resilient coupling 75 could be formed of a low durometer material, such as a disk or sleeve.

(30) In another embodiment the resilient coupling 75 could be formed of a foam material, such as a disk or sleeve.

(31) In this embodiment the resilient coupling 75 comprises a plurality of resilient coupling elements.

(32) In another embodiment the resilient coupling 75 could comprise a single resilient coupling element.

(33) In one embodiment the resilient coupling 75 could comprise one or more spring elements, such as helicoidal or leaf springs.

(34) In another embodiment the resilient coupling 75 could comprise one or more elastomeric or rubber elements, such as elastic bands.

(35) In other embodiments the resilient coupling could comprise combinations of any of the above-described elements.

(36) In this embodiment the body 57 includes a stem 77 which extends into the respective bore 31 in the support platform 21, and is slideable within the bore 31 to allow for displacement of the body 57 in the vertical or Z-axis orient.

(37) In this embodiment the stem 77 extends from the upper body part 63 through the respective bore 31 in the support platform 21, and defines a fluid channel 81, which extends between the upper body part 63 and a lower surface of the support platform 21, which is fluidly connected to a vacuum or reduced pressure source 85, whereby a vacuum or reduced pressure is applied to the support surface 65 of the head 64 of the upper body part 63, such as to fix a supported workpiece W at a defined position on the upper body part 63, and also maintain the workpiece W flat, where the workpiece W is warped or flexible.

(38) In this embodiment, by applying a vacuum or reduced pressure source 85 commonly to the manifold cavity 20, individual connections to each of the support members 23 are not required, and the support module 19 can be removed as an integral module.

(39) The referencing assembly 11 comprises a support platform 100, a horizontal referencer 101 for referencing the workpieces W supported by the carrier units 15 of the workpiece carrier 7 in a horizontal orient relative to the support platform 100, and a vertical referencer 102 for referencing the workpieces W supported by the carrier units 15 of the workpiece carrier 7 in a vertical orient relative to the support platform 100.

(40) The horizontal referencer 101 comprises a horizontal referencing unit 103 which is supported by the support platform 100 over the upper body parts 63 of the support members 23, and an actuation mechanism 104 which is operative to actuate the horizontal referencing unit 103 to reference the workpieces W supported by the carrier units 15 of the workpiece carrier 7 in a horizontal or X-Y orient.

(41) In this embodiment the horizontal referencing unit 103 comprises first and second referencing members 111a, b, here in the form of plates, which each include a plurality of counterpart apertures 113a, b which are arranged in correspondence with the support members 23 and are configured to receive the respective workpieces W as supported thereby.

(42) In this embodiment the first and second referencing members 111a, b are displaceable in opposite directions, such as to center the workpieces W in the respective apertures 113a, b and reference the horizontal or X-Y orient of the workpieces W.

(43) In this embodiment the first, upper referencing member 111a includes apertures 113a of fixed shape, here having a rectangular profile which is oversized relative to the size of the workpieces W, at least one edge of which, here two adjacent orthogonal edges, define a workpiece-engagement surface, and the second, lower referencing member 111b includes counterpart apertures 113b, at least one edge of which, here two adjacent orthogonal edges, include a projection 115a, b which extends into the respective apertures 113a in the upper plate element 111a to an upper surface of the upper referencing member 111a and defines a workpiece-engagement surface.

(44) With this configuration, the at least one, here adjacent, orthogonal edges, of the apertures 113a in the upper referencing member 111a and the at least one, here first and second projections 115a, b at adjacent, orthogonal edges at the apertures 113b in the lower referencing member 111b act to engage opposite edges of the respective workpieces W and center the workpieces W at predetermined positions in the horizontal orient, here both in terms of their X, Y position and in terms of their rotation θ relative to the vertical or Z-axis.

(45) In this embodiment the referencing members 111a, b are moved along an axis which is inclined to at least one edge of the workpieces W. In one embodiment, where the workpieces W have orthogonal edges, the referencing members 111a, b are moved in a direction intermediate the two orthogonal edges, typically at 45 degrees thereto.

(46) In this embodiment the workpieces W have a rectangular shape and the apertures 113a, b define orthogonal edges against which the workpieces W are engaged.

(47) In an alternative embodiment the apertures 113a, b could define point contacts, such that the workpieces W are contacted only at points along the edges thereof.

(48) In another alternative embodiment the apertures 113a, b could include resilient contacts, such as spring contacts, such that the workpieces W are contacted only at points along the edges thereof.

(49) In this embodiment the support platform 100 comprises a support body 117 which includes an aperture 119 through which the upper body parts 63 of the support members 23 are displaceable.

(50) In this embodiment the actuation mechanism 104 comprises a plurality of actuators 121a-f, 122a-f which are configured to displace the first and second referencing members 111a, b in a horizontal plane.

(51) In this embodiment the actuation mechanism 104 comprises a plurality of first actuators 121a-f which engage the first referencing member 111a and displace the same in a first direction H1 and a plurality of second actuators 122a-f which engage the second referencing member 111b and displace the same in a second direction H2, which is opposite to the first direction H1.

(52) The vertical referencer 102 comprises a vertical referencing member 125 and a transport mechanism 127 for transporting the vertical referencing member 125 from a first, inoperative or rest position to a second, operative position over the support members 23 of the support module 19.

(53) In this embodiment the vertical referencing member 125 comprises a plate, here a relatively-heavy plate, against which the workpieces W as supported by the support members 23 are biased, which acts to reference the supported workpieces W to a common height when the workpieces W are raised from the carrier units 15 in the workpiece carrier 7.

(54) In this embodiment the vertical referencing member 125 has a planar lower surface, but in other embodiments the lower surface could be profiled, such as by way of including recesses, in order to accommodate features or components on the upper surfaces of the workpieces W.

(55) In this embodiment the vertical referencing member 125 is located adjacent and below the support platform 100 when in the inoperative or rest position.

(56) In this embodiment a lower surface of the vertical referencing member 125 is located at a predetermined height relative to the support platform 100 when in the operative position. In one embodiment the vertical referencing member 125 is located on the upper surface of the horizontal referencing unit 103 when in the operative position.

(57) In use, when raising the support module 19, the support members 23 are raised until the supported workpieces W each engage the lower surface of the vertical referencing member 125. The workpieces W can engage at different times depending upon the thicknesses of the workpieces W, and this configuration also allows for some variation in the heights of the support members 23, meaning that the support members 23 do not need to be calibrated to have the same height in the manner of existing support systems. As the support members 23 engage the lower surface of the vertical referencing member 125, the support platform 21 can be raised further as the stems 77 are slideable through the respective bores 31 in the platform body 25, and the support platform 21 can be raised until the upper surfaces of all of the workpieces W engage the lower surface of the vertical referencing member 125. When in this configuration, the locking member 51 is actuated to lock the vertical or Z-axis height of the support members 23, such that the workpieces W are at a common vertical or Z-axis position.

(58) In one embodiment the vertical referencer 102 could be omitted. In one embodiment the support members 23 are calibrated and the workpieces W have a substantially uniform thickness,

(59) In this embodiment the transport mechanism 127 comprises a support cradle 128 which comprises first and second arms 131 which engage lateral edges of the vertical referencing member 125 and a body 133 which supports the arms 131 in fixed relation, a pivotable coupling 135 which couples the support cradle 128 relative to the support platform 100 and acts to translate the support cradle 128 between the inoperative and operative positions, and an actuator 137 which is operable to drive the support cradle 128 between the inoperative and operative positions.

(60) FIGS. 6(a-j) illustrate the operative steps in use of the workpiece support system of FIG. 1.

(61) As illustrated in FIG. 6(a), with the support module 19 of the support assembly 3 in a lowered configuration relative to the horizontal referencing unit 103, a workpiece carrier 7 is introduced beneath the horizontal referencing unit 103.

(62) The vertical referencer 102 is operated to move the vertical referencing member 125 from the inoperative position to the operative position above the horizontal referencing unit 103, as illustrated in FIG. 6(b).

(63) The vacuum pressure source 85 is then actuated to provide a vacuum at the heads of the support members 23, and the support module 19 of the support assembly 3 is raised relative to the horizontal referencing unit 103.

(64) As illustrated in FIG. 6(c), the heads 64 of the support members 23 engage a lower surface of the workpieces W, which are held thereto by the vacuum thereat, and lift the workpieces W from the carrier units 15 of the workpiece carrier 7.

(65) The support members 23 are raised until the supported workpieces W each engage the lower surface of the vertical referencing member 125, as illustrated in FIG. 6(d), with the workpieces W engaging at different times depending upon the thicknesses of the workpieces W. In this configuration the workpieces W are located in the respective apertures 113a, b in the referencing members 111a, b of the horizontal referencing unit 103.

(66) With the workpieces W referenced in the vertical position, locking member 51 of the support platform 21 is actuated to lock the support members 23 at the vertical or Z-axis height, in this embodiment by engagement of the contact elements 54 with the stems 77 of the support members 23, as illustrated in FIG. 6(e).

(67) The vertical referencer 102 is operated to move the vertical referencing member 125 from the operative position to the inoperative position away from the horizontal referencing unit 103, as illustrated in FIG. 6(f).

(68) As illustrated in FIG. 6(g), the actuators 121a-f, 122a-f of the actuation mechanism 104 are actuated to displace the first referencing member 111a in a first direction H1 and the second referencing member 111b in a second direction H2, being opposite to the first direction H1, which causes the adjacent, orthogonal edges of the apertures 113a in the upper referencing member 111a and the first and second projections 115a, b at adjacent, orthogonal edges at the apertures 113b in the lower referencing member 111b to engage opposite edges of the respective workpieces W and center the workpieces W at predetermined positions in the horizontal orient, here both in terms of their X, Y position and in terms of their rotation θ relative to the vertical or Z-axis. This referencing of the workpieces W is made possible by the resilient couplings 75 between the lower and upper body parts 61, 63 of the support members 23 which allow the upper body part 63, and hence the head 64 thereof which supports the workpiece W, to be displaced from a first, unbiased position to a second, biased position.

(69) In this horizontal referenced position, a process operation is performed on the workpieces W. Such operations include printing and pick-and-place operations, by way of example.

(70) As illustrated in FIG. 6(h), the actuators 121a-f, 122a-f of the actuation mechanism 104 are actuated to displace the first referencing member 111a in the second direction H2 and the second referencing member 111b in the first direction H1, which causes the adjacent, orthogonal edges of the apertures 113a in the upper referencing member 111a and the first and second projections 115a, b at adjacent, orthogonal edges at the apertures 113b in the lower referencing member 111b to dis-engage opposite edges of the respective workpieces W. With this action, the resilient couplings 75 between the lower and upper body parts 61, 63 of the support members 23 cause the upper body part 63, and hence the head 64 thereof which supports the workpiece W, to return from the biased position to the unbiased position without any intervention.

(71) The vacuum pressure source 85 is then de-actuated to release the vacuum at the heads 64 of the support members 23, and the support module 19 of the support assembly 3 is lowered relative to the horizontal referencing unit 103.

(72) As illustrated in FIG. 6(i), the heads 64 of the support members 23 dis-engage a lower surface of the workpieces W as the workpieces W are seated in the carrier units 15 of the workpiece carrier 7.

(73) The support module 19 of the support assembly 3 is returned to the lowered configuration relative to the horizontal referencing unit 103, which allows the workpiece carrier 7 to be transported from beneath the horizontal referencing unit 103 and the process repeated.

(74) Finally, it will be understood that the present invention has been described in its preferred embodiments and can be modified in many different ways without departing from the scope of the invention as defined by the appended claims.

(75) In one embodiment the workpieces W could comprise a plurality of workpiece elements which are supported by a common carrier element.

(76) In one modification the horizontal referencing unit 103 could comprise only a single referencing member 111a which is displaced in a horizontal plane and acts to engage all of the workpieces W to move the same to predetermined reference positions in the horizontal or X-Y plane.