Method for converting a wrapping machine into a transport condition, and a wrapping machine

Abstract

A method for converting a wrapping machine into a transport condition, said wrapping machine comprising a wrapping machine frame, as well as a circular guide mounted on the frame, whereby, in order to convert the wrapping machine into a transport condition, the circular guide mounted on the wrapping machine frame is tilted with respect to the wrapping machine frame. The invention relates also to such a wrapping machine.

Claims

1. A method for converting a wrapping machine from an operating position into a transport position, said wrapping machine comprising a wrapping machine frame having a first side and a second side opposite the first side and a circular guide pivotably connected to the frame via a first connecting part and an opposing second connecting part, said method comprising: providing the wrapping machine in the operating position, wherein in the operating position the first connecting part and the second connecting part are between the first and second sides of the frame; and when the wrapping machine is in the operating position in which a first portion of the circular guide extends outside of the first side of the frame and a second portion of the circular guide extends outside of the second side of the frame, pivoting the circular guide relative to the wrapping machine frame about a pivot axis to the transport position in which part of the first portion of the circular guide and part of the second portion of the circular guide are between the first and second sides of the frame, the pivot axis extending between the first and second connecting parts and through an area bound by the circular guide.

2. The method of claim 1, wherein the wrapping machine includes attachment components configured to lock the circular guide in a horizontal orientation when the circular guide is in the operating position, the method including unlocking the attachment components before pivoting the circular guide.

3. The method of claim 2, wherein the attachment components are configured to lock the circular guide to at least one pivot shaft about which the circular guide is pivotable to secure the circular guide in the operating position, the method including unlocking the circular guide from the at least one pivot shaft before pivoting the circular guide.

4. The method of claim 1, which includes pivoting the circular guide relative to the wrapping machine frame about the pivot axis until the circular guide is angled about 45 degrees to about 90 degrees relative to a horizontal plane.

5. The method of claim 1, wherein the wrapping machine further includes a first pivot shaft and an opposing second pivot shaft, the first pivot shaft connected to the first connecting part and the second pivot shaft connected to the second connecting part.

6. The method of claim 5, wherein the first pivot shaft is connected to the first connecting part at a midpoint of the first connecting part and the second pivot shaft is connected to the second connecting part at a midpoint of the second connecting part.

7. The method of claim 5, wherein the pivot axis extends between the pivot shafts.

8. The method of claim 1, wherein the pivot axis extends across a diameter of the area bound by the circular guide.

9. The method of claim 1, wherein when the circular guide is in the transport position, all of the first portion of the circular guide is between the first and second sides of the frame and all of the second portion of the circular guide is between the first and second sides of the frame.

10. The method of claim 1, further comprising wrapping a load positioned in an area defined by the circular guide by rotating the circular guide while simultaneously moving the circular guide in a vertical direction.

11. A wrapping machine comprising: a frame having a first side and a second side opposite the first side, a first connecting part supported by the frame; an opposing second connecting part supported by the frame; a circular guide pivotably mounted to the first and second connecting parts so the circular guide is pivotable relative to the frame and about a pivot axis between an operating position and a transport position, wherein the pivot axis extends between the first and second connecting parts and through an area bound by the circular guide; and elements connected to the circular guide and configured to wrap a plastic film web around a load placed within the area bound by the circular guide, wherein when the circular guide is in the operating position: (i) the first connecting part and the second connecting part are between the first and second sides of the frame; and (ii) a first portion of the circular guide extends outside of the first side of the frame and a second portion of the circular guide extends outside of the second side of the frame, and wherein when the circular guide is in the transport position, part of the first portion of the circular guide and part of the second portion of the circular guide are between the first and second sides of the frame.

12. The wrapping machine of claim 11, which includes attachment components configured to lock the circular guide in the operating position.

13. The wrapping machine of claim 12, wherein the attachment components are configured to lock the circular guide to at least one pivot shaft about which the circular guide is pivotable to secure the circular guide in the operating position.

14. The wrapping machine of claim 11, wherein the circular guide is pivotable relative to the wrapping machine frame about the pivot axis between a horizontal orientation and an angle about 45 degrees to about 90 degrees relative to a horizontal plane.

15. The wrapping machine of claim 11, which includes a first pivot shaft and an opposing second pivot shaft, the first pivot shaft connected to the first connecting part and the second pivot shaft connected to the second connecting part.

16. The wrapping machine of claim 15, where the first pivot shaft is connected to the first connecting part at a midpoint of the first connecting part and the second pivot shaft is connected to the second connecting part at a midpoint of the second connecting part.

17. The wrapping machine of claim 16, wherein the pivot axis extends between the pivot shafts.

18. The wrapping machine of claim 11, wherein when the circular guide is in the transport position, all of the first portion of the circular guide is between the first and second sides of the frame and all of the second portion of the circular guide is between the first and second sides of the frame.

Description

(1) The invention will now be described more precisely by way of example with reference to the accompanying figures, in which

(2) FIG. 1 shows schematically one wrapping machine according to the invention in an operating condition three-dimensionally in a view obliquely from above,

(3) FIG. 2A shows the wrapping machine of FIG. 1 in a transport condition in a view from end,

(4) FIG. 2B shows the wrapping machine of FIG. 1 in a transport condition three-dimensionally in a view obliquely from above,

(5) FIG. 3A shows schematically one optional wrapping machine according to the invention in an operating condition,

(6) FIG. 3B shows the wrapping machine of FIG. 3A in a transport condition, and

(7) FIG. 4 shows schematically a frame structure for one wrapping machine according to the invention in a transport condition.

(8) A wrapping machine 1 according to the invention, which is shown schematically in FIGS. 1, 2A and 2B, comprises a frame 2, a substantially horizontal stationary circular guide 4 movable in a vertical direction of the machine and mounted on the frame by way of connecting parts 3, 3, from which stationary circular guide is suspended by way of rollers a movable circular guide 5 located underneath the stationary circular guide. To the movable circular guide 5 are attached film supply carriages 6 and 6, the number of which is two in the illustrated embodiment and which are placed in mutually opposite positions relative to the movable circular guide. To the stationary circular guide 4 are attached, so as to lie above the circular guide, linear guides 7, 7 for an upper film unit, as well as fastening means 8, 8 for a gripper and cutter of the upper film unit.

(9) The wrapping machine's 1 frame 2 consists of four vertical columns, as well as crossbars securing these vertical columns to each other at top edges thereof, the frame becoming a quadrangle. The frame 2 has the longer sides of its quadrangle, i.e. the longer crossbars, defining a longitudinal direction of the wrapping machine 1, and the shorter sides, i.e. the shorter crossbars, defining a lateral direction of the wrapping machine. The wrapping machine 1 is secured to a solid foundation by the bottom ends of the frame's 2 vertical columns.

(10) In order to move the circular guides 4, 5 in vertical direction, the frame 2 has its vertical columns formed with vertical tracks, along which the connecting parts 3, 3, and therefore the circular guides, are moved in vertical direction with a motor 9. On the other hand, the motion of the movable circular guide 5 is achieved with a rotating motor 10 mounted on one of the connecting parts 3.

(11) When operating the wrapping machine 1, which operating condition is shown in FIG. 1, the load to be wrapped is brought on a pallet inside an area defined by the circular guides 4, 5. This is followed by lowering the circular guides 4, 5 to a starting height around the load, and the ends of film webs located in the film supply carriages 6, 6 are brought into contact with the load and attached to a surface of the load for starting the wrapping process. If necessary, prior to attaching the film webs of the film supply carriages 6, 6 to the load, a plastic film is provided by the upper film unit for covering a top surface of the load. At the start of a wrapping process, the end of a film web can be held for example by a film gripper (not shown), whereby, after a first wrapping cycle, the film gripper releases its grip of the film and the first end of the film is left underneath the following film layers.

(12) Once the ends of film webs are attached to a load to be wrapped, the actual wrapping process is conducted by rotating the film supply carriages 6, 6 around the load being wrapped by rotating the movable circular guide 5, while the circular guide 5 is simultaneously moved also in vertical direction. The wrapping process is continued until a predetermined amount of film web has become wrapped around the load. The amount of film web to be wrapped varies from case to case, nor is the entire load necessarily always wrapped in a film web. The wrapping process is terminated by cutting the film web and by attaching the end of the wrapped film web to a surface of the load. Finally, the circular guides 4, 5 are lifted to a top position and the load is removed from the wrapping apparatus. In connection with cutting the film web, the above-mentioned film gripper takes hold of the film web end remaining in the wrapping machine, whereby the wrapping machine is ready to start wrapping the next load.

(13) In the wrapping machine 1 embodiment of FIGS. 1, 2A and 2B, the attachment of the stationary circular guide 4 to the connecting parts 3, 3 for converting the machine into a transport condition shown in FIGS. 2A and 2B has been implemented in such a way that each connecting part has its mid-portion fitted with a pivot shaft 11, said pivot shaft connecting the stationary circular guide 4 to the connecting part in a pivotable manner. In addition, the circular guide 4 is secured at two connecting points located on either side of the pivot shaft 11 to the connecting points when the circular guides 4, 5 are in an operating condition, whereby the attachments of the connecting points are disengaged for releasing the circular guides for tilting.

(14) In the transport position shown in FIGS. 2A and 2B, the wrapping machine 1 has its circular guides 4, 5 attached in a disengageable and suitable manner for example to a crossbar of the frame 2 for retaining a tilted position.

(15) The circular guides 4, 5 in a transport position have a tilt angle of preferably about 45 relative to horizontal plane.

(16) With regard to the illustrated embodiment, it is also to be noted that this embodiment enables the wrapping machine 1 to be installed, for example in connection with a conveyor line, such that the loaded pallets are brought to the wrapping machine in a longitudinal direction of the wrapping machine for a wrapping process. Such a longitudinally effected installation along the line reduces the space demand of a wrapping machine in lateral direction, the widest part of the wrapping machine 1 being constituted by the film supply carriages 6, 6 attached to the movable circular guide 5 during rotation of the same along the circular guide. Hence, this longitudinal installation of the wrapping machine 1 enables more efficient space utilization.

(17) In FIGS. 3A and 3B is schematically shown one optional wrapping machine 21 according to the invention. In this embodiment, the wrapping machine 21 consists of a simplified frame 22, a frame supporting structure 23, a circular guide 24 in the form of a ring, supporting parts 25, 25 for the circular guide, connecting parts 26, 26 attaching the circular guide supporting parts to the frame, as well as a film supply carriage 27.

(18) In this embodiment, the circular guide 24 only comprises a single piece in the form of a ring, which is rotated in a horizontal plane by the action of the circular guide supporting parts 25, 25. Rotating the circular guide 24 enables the film supply carriage 27 mounted on the circular guide to be set in rotation around a load to be wrapped and placed inside the circular guide. A vertical movement of the circular guide 24 is effected with actuators (not shown) moving the connecting parts 26, 26 along vertical members of the frame 22.

(19) A tilting capability of the circular guide 24, shown in FIG. 3B, with respect to the frame 22 of the wrapping machine 21 for converting the wrapping machine into a transport condition has been achieved in this embodiment with a two-piece structure of the connecting parts 26, 26. Hence, the pieces of the connecting parts 26, 26, which attach to the supporting parts 25, 25 of the circular guide 24, are pivotable with respect to the pieces of the connecting parts, which attach to the frame 22 of the wrapping machine 21, about a pivot axis extending lengthwise of the frame 22.

(20) In the embodiment of FIGS. 3A and 3B, the locking of the circular guide 24 to an operating position by using the two-piece connecting parts 26, 26 and disengaging/releasing the locking for tilting the circular guide to a transport position is achievable in a simple manner obvious for a skilled person. Neither does this embodiment necessarily call for any other actions besides tilting the circular guide 24 for converting the wrapping machine 21 into a transport condition, whereby setting up the wrapping machine on its working site is a highly simple and expedient process.

(21) In FIG. 4 is schematically shown one wrapping machine frame structure 31 according to the invention, wherein a circular guide 32 has been pivoted for a transport condition into a parallel relationship with a plane defined by the frame structure, i.e. pivoted to an angle of 90 with respect to a horizontal plane defined by an operating position of the circular guide. The attachment of the circular guide 32 to the frame 31 and the tilting ability of the circular guide relative to the frame have been accomplished in this embodiment with elements according to the embodiment of FIGS. 3A and 3B.

(22) This type of most advantageous and most compact transport position is possible with such wrapping machines, the size of whose circular guide 32 is such that it fits in its entirety within an area defined by the wrapping machine frame 31.

(23) The circular guides presented in the preceding embodiments are rotatable relative to the wrapping machine frame during operation, whereby the movement of film supply carriages or elements mounted on the circular guide is effected on the basis of a movement of the circular guide. However, in a solution of the invention, the circular guide can be constructed in such a way that, with the exception of a vertical movement, the circular guide itself is stationary with respect to the wrapping machine frame. In this case, the film supply carriage is provided with elements by means of which the carriage is able to move independently along a track formed by the circular guide. In a solution such as this, the attachment of a circular guide to the frame of a wrapping machine is generally simpler, whereby the tilting ability of a circular guide with respect to the frame of a wrapping machine is more easily achieved.

(24) Regarding the embodiments shown in the figures and described above, it should be noted that those are by no means intended to limit the invention, but only as examples to clarify the invention. The scope of protection for the invention is solely defined by the appended claims, so the invention can be modified from the preceding embodiments as obvious for a skilled artisan within the scope of protection defined by the claims.