JP2783176B2 - Stretch wrapping machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging machine which draws out a film drawn from a film roll into a packaging section via a film guide roller, and stretches the packaging by pushing up an object to be packaged. The present invention relates to a stretch wrapping machine for preventing the film from being entangled by the film guide roller at the time of drawing.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional stretch wrapping machine includes a film 1 drawn from a film roll.
00 is held by a film holding unit 102 via a film guide roller 101, and the leading end of the film held by the film holding unit 102 is gripped by a gripper 103 having substantially the same width as the film width and horizontally pulled out. In some cases, the film is stretched on a wrapping portion, and the object to be wrapped is pushed up on the film to perform stretch wrapping.

[0003]

As described above, the film guide roller 101 for introducing the film 100 drawn from the film roll into the film holding section 102 is a single-sheet roller having a length substantially equal to the width of the film. A roller is supported horizontally before the film holding unit 102. The film 100 held by the film holding unit 102 via the film guide roller 101 is gripped by the gripper 103 and is automatically pulled out toward the packaging unit every time the packaged object is wrapped. Is configured.

[0004] However, as shown in FIG.
In the case where the leading end of the film is obliquely torn or bent due to cutting at 00, etc., the leading end of the film having a short width may be held by the film holding unit 102. In this case, the film holding unit 1
In the state where the holding width of the film in 02 is insufficient, gripping by the gripper 103 is performed, and the film 100 is pulled out by the gripper 103 while a part of the film 100 is gripped. As described above, when only a part of the film 100 is gripped and pulled out by the gripper 103, the gripper 103 is pulled out.
As a result, the portion of the film 100 that is not gripped is loosened without being pulled out, so that the film 100 may be caught on the outer periphery of the rotating film guide roller 101, making it impossible to continue the operation.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a stretch wrapping machine as described above, even when the holding width of the film holding portion is insufficient due to cutting of a film or the like. An object of the present invention is to provide a function capable of preventing the film from being rolled up by the film guide roller.

[0006]

In order to achieve the above-mentioned object, the present invention holds a leading end of a film pulled out from a film roll in a film holding section via a film guide roller, so that each time a product is packaged. to the tip of the film were gripped by gripping means, mosquitoes are drawn out horizontally a predetermined length
In a stretch wrapping machine that cuts by a cutter and spreads it on a wrapping section, and then pushes up an object to be wrapped with respect to the film and wraps the film, the film guide roller is divided into a plurality of pieces in the axial direction. Each is configured to rotate independently.

[0007] The split roller has a mirror-like outer peripheral surface.
Finish and attach a one-way clutch to the split roller.
So that it can be rotated only in the direction in which the film is pulled out.
Film guide roller near the film holder
Deploy.

In the stretch wrapping machine, a free roller rotatable in forward and reverse directions is provided between adjacent divided rollers, and the outer peripheral surface of the free roller has a smaller adhesive force to the film than the outer peripheral surface of the divided roller. You may comprise with a low member.

[0009]

According to the above means, the film pulled out from the film roll is held by the film holding section via the outer periphery of the film guide roller. Further, the film guide roller is divided into a plurality in the axial direction,
Each split roller rotates independently.

When the width of the leading end of the film held by the film holding portion is insufficient due to cutting of the film or the like, when the leading end of the film held by the film holding portion is gripped by the gripping means, the leading end of the film is lifted. The film is pulled out with only part of the film being gripped. When the film is pulled out in the above state, the divided rollers in the area in contact with the film in the portion gripped by the gripping means are rotated by the contact of the film. However, the split roller in the other portion, that is, the portion corresponding to the portion not gripped by the leading end of the film, does not rotate because no rotating force is applied, and the possibility of winding the film is eliminated.

Further, in a configuration in which a one-way clutch is provided on a predetermined split roller and is rotatable only in the film pull-out direction, the reverse rotation of the split roller is completely prevented in order to completely prevent reverse rotation of the split roller. There is no going back.

Further, in the case where a free roller is provided between the divided rollers, and the surface of the free roller is formed of a member having low adhesion to the film, the rotational force transmitted between the adjacent divided rollers is used. Is reduced by interposing a free roller having a small frictional resistance on the outer peripheral surface.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. 1 and 5 show a stretch packaging machine embodying the present invention. The stretch wrapping machine is for wrapping a product in a loose state or a product placed on a tray in a film package. A placement section C is provided on the front surface of the apparatus main body B, and the stretch wrapping machine is provided on an upper part of the apparatus main body B. A packaging section D for wrapping and taking out goods conveyed from the placing section C is disposed, and a film supply section E provided at an upper portion of the apparatus main body B is provided.
Is set with a film roll a.

In the packaging machine, a placing portion C for placing a product to be packaged is disposed on the front side of an apparatus main body B formed in a substantially box shape by a machine frame and a decorative cover. A packaging unit D for horizontally pulling out and stretching a film roll a for wrapping is provided on the upper surface of the apparatus main body B. Carrying table F that receives the product from the placing section C and conveys it to the packaging section D
Is configured so as to move the carriage F, which has received the product, in the apparatus main body B in the horizontal direction and the vertical direction by linking with the drive mechanism G. For details, see
See -179407.

The transfer table F is a horizontal operating unit G of a driving mechanism G.
1 moves horizontally below the placing portion C on which the product 1 is placed. In the placing section C, the receiving section F1 is vertically moved so as to protrude upward from the placing section C, and receives the product placed on the placing section C. Then, the transport table F on which the goods are placed in the receiving section F1 is horizontally moved below the packaging section D by the operation of the horizontal operation section G1, and further, the packaging section D is moved by the vertical operation section G2.
To the film a 'which is stretched horizontally
Is vertically moved, and the film a 'is folded up and down and wrapped while pushing up and stretching the film a' upward.

The leading edge of the film drawn from the film roll a a 'is Ru is held by the film holder J. Then, the film held by the film holding unit J is gripped by the front gripper H serving as a film gripping unit every time the product is wrapped, and is pulled out horizontally toward the packaging unit D by a predetermined length. The film is cut by a film cutter K, and the front and rear sides of the film are gripped by a pair of a front gripper H and a rear gripper I, and are conveyed to a predetermined position of the packaging unit D.

The film roll a is set by being fitted to a roll set shaft 5 which is horizontally supported by a film supply section E at the uppermost portion of the apparatus main body B. The film a 'wound around the film roll a is drawn downward toward the film guide roller 1 provided at a middle position on the rear side of the apparatus, and is horizontally bent by passing through the film guide roller 1. Then, the film is introduced into the film holding section J to hold the leading end of the film.

As shown in an enlarged view of FIG. 1, a film holding portion J includes a holding plate j1 bent along a drawing path of a film a 'which is bent in a substantially rectangular shape by a film guide roller 1, and a film a. 'And a holding plate j2 disposed horizontally along the lower surface of the bent portion. The two holding plates j1 and j2 are vertically stacked via the gap j3 so as to form a gap j3 for horizontally sandwiching the leading end of the film a '. Further, the front sides of the holding plates j1 and j2 are cut out in a planar comb shape, and the film a 'is introduced and held up to the front ends. Further, as described above, the leading end of the film a 'held between the two holding plates j1 and j2 is gripped by the front gripper H formed in a flat comb shape similarly to the holding plates j1 and j2, and from within the gap J3. It is configured to be pulled out horizontally.

The film guide roller 1 is rotatably supported in a horizontal state by fixing both ends of the support shaft 1b with both support pieces 2 protruding from both right and left sides of the holding plate j1. As shown in FIG. 2, the film guide roller 1 is divided into a plurality in the axial direction, and each of the divided rollers 1a is rotatably supported by being fitted on a support shaft 1b. In the case of the above embodiment, the film guide roller 1 is divided into six divided rollers 1a, and each divided roller 1a is freely rotated individually by being fitted to the support shaft 1b so as to be rotatable forward and backward. It is configured in. In addition, a fine uneven line extending in the axial direction is formed on the outer peripheral surface of each of the divided rollers 1a to reduce the adhesive force with the film a '.

In the stretch wrapping machine constructed as described above, the film a 'pulled out from the film roll a is introduced between the two holding plates j1 and j2 of the holding section J via the film guide roller 1. It is held in the state where it was. Then, each time packaging is performed, the front gripper H grips the leading end of the film a 'held by the holding portion J and pulls the film a' toward the packaging portion D by a predetermined length to perform packaging.

For example, when the leading end of the film a 'held by the film holding portion J is cut off obliquely due to cutting of the film a or the like and the width to be gripped is insufficient, the film is held by the film holding portion J. When the front end of the film a 'is gripped by the front gripper H, as in the case shown in FIG.
Is pulled out.

In the above state, when the film a 'is pulled out horizontally, the divided roller 1a in the range S1 in contact with a portion gripped by the front gripper H, for example, one half of the film a', one side 3 The divided rollers 1a rotate.
However, the range S2 corresponding to the portion that is not gripped by the gripper H, that is, the remaining three divided rollers 1a located in the other half do not rotate because no rotational force is applied from anywhere. Therefore, even if the film a 'is pulled out in the above state, the three divided rollers 1a in the other half of the film guide roller 1 do not rotate, so that the winding of the film a' by these divided rollers 1a can be prevented. .

As the film guide roller provided in the above-mentioned stretch wrapping machine, the one shown in FIG. 3 may be used. The film guide roller 11 shown in FIG. 3 is configured by dividing the film guide roller into six divided rollers 11a, similarly to the film guide roller 1 described above. However, the film guide roller 11
Is provided with a one-way clutch (not shown) between each divided roller 11a and the support shaft 11b so that each divided roller 11a rotates only in the direction in which the film a 'is fed.

The surface of each split roller 11a is mirror-finished by chrome plating to increase the adhesion between the roller surface and the film a '. In the stretch wrapping machine including the film guide roller 11, when the film a 'is pulled out by the front gripper H, the reverse rotation of each of the divided rollers 11a is completely prevented. The film a 'can be effectively prevented from returning due to the reverse rotation of the film a' and causing the film a 'to be loosened or detached from the film holding portion J.

Further, the film guide roller provided in the stretch packaging machine of the present invention may be configured as shown in FIG. The film guide roller 21 shown in FIG. 4 is configured by alternately arranging relatively short divided rollers 21a and free rollers 21c rotatable in forward and reverse directions. Each of the split rollers 21a is a roller having a small width. The outer peripheral surface is subjected to chrome plating to be mirror-finished, and a one-way clutch (not shown) is provided for the support shaft 21b.
And is configured to rotate only in the feeding direction of the film a ′.

The free roller 21c is a roller having a relatively large width between the above-mentioned divided rollers 21a, and is fitted on the support shaft 21b and supported so as to be freely rotatable forward and backward. Further, a fine uneven line extending in the axial direction is formed on the outer periphery of each free roller 21c, and the adhesion of the outer peripheral surface to the film is suppressed to be lower than that of the split roller 21a.

In the stretch wrapping machine provided with the film guide roller 21 configured as described above, the cost of the split roller 2 increases because the one-way clutch is provided.
The length and the number of 1a can be reduced. Further, the free roller 2 having a small coefficient of friction is provided between the divided rollers 21a.
1c, the film guide roller 2
As the number of divisions of 1 increases, the phenomenon that the rotation of the division roller 21a in the range rotated by drawing out the film a ′ is transmitted to the division roller 21a in the non-rotation range via frictional force is reduced, The effect of preventing the winding of the film a 'can be improved.

In order to prevent transmission of rotation between rollers due to friction, it is preferable that the friction coefficient at the contact surface of each roller is low. Therefore, by applying a lubricant to the contact surface between the split roller 21a and the free roller 21c, or by interposing a slippery ring, it is possible to effectively reduce the frictional force generated between the rollers. it can. These friction reducing means are also effective for the film guide rollers 1 and 11 described above.

In the above-mentioned stretch wrapping machine, the position for mounting the film roll a is located on the upper back side of the apparatus main body B, but the position for mounting the film roll a is not limited to this. May be located at the lower part or on both the left and right sides. Further, in the above-described embodiment, the front gripper H is used as the gripping means for the film a ', but the film gripping means may be modified such that a belt is used instead of the gripper.

[0030]

As described above, according to the present invention, since the film guide roller is divided into a plurality of pieces in the axial direction, only a part of the film width held by the film holding portion can be gripped. Even when the film is pulled out, only the split roller in the range that comes into contact with the film in the gripped range rotates, and the split roller in the range corresponding to the cutout portion of the film does not rotate. It is possible to prevent the problem of being caught in the.

Further, by dividing the film guide roller into a plurality of divided rollers, the weight per roller is reduced, so that the overrun of the roller that occurs immediately after the film is drawn can be reduced. Therefore, it is possible to prevent the film from being rolled up due to the overrun of the roller with a simple configuration.

[0032] The one-way clutch provided at a predetermined split roller, since the rotatable in only the divided roller drawing direction of the film, reversal of the divided roller at the film draw-out can be completely prevented, thereby Fi <br It is possible to prevent a problem that the film held by the film holding section is returned and comes off.

A free roller is provided between the split rollers,
In the case where the outer peripheral surface of the free roller is formed of a member having low adhesion to the film, the length and the number of the split rollers, which are expensive due to the provision of the one-way clutch, can be reduced. Furthermore, by interposing a free roller with low frictional resistance between each split roller,
The number of divisions of the film guide roller can be increased,
This effectively reduces the transmission of the rotation of the split roller in the range rotated by drawing the film through the frictional force to the split roller in the non-rotated range, thereby further improving the effect of preventing film entanglement. Can be done.

[Brief description of the drawings]

FIG. 1 is a longitudinal side view showing a stretch packaging machine embodying the present invention.

FIG. 2 is a front view showing a film guide roller.

FIG. 3 is a front view showing a film guide roller provided with a one-way clutch.

FIG. 4 is a front view showing a film guide roller including a split roller and a free roller.

FIG. 5 is a longitudinal sectional side view showing a film holding unit.

FIG. 6 is a perspective view showing a film holding section of a conventional stretch packaging machine.

[Explanation of symbols]

 a: film roller a ': film H: front gripper J: film holding unit 1: film guide roller 1a, 11a, 21a: split roller 21c: free roller

Claims (2)

(57) [Claims] 1. A film drawn from a film roll
Of the film is held by the film holding unit via the film guide roller, and the leading end of the film is gripped by the gripping means for each package of the product, and is pulled out horizontally for a predetermined length.
In a stretch wrapping machine that cuts and spreads the package on the film and then pushes up the object to be wrapped against the film, the film guide roller is divided into a plurality in the axial direction, and the outer periphery of each divided roller is divided. Stretch wrapping machine that has a mirror-finished surface and a one-way clutch provided on the split roller so that it can rotate independently only in the direction in which the film is pulled out, and the film guide roller is arranged near the front of the film holding unit. . 2. A free roller rotatable in forward and reverse directions is provided between adjacent divided rollers, and an outer peripheral surface of the free roller is formed of a member having a lower adhesive force to a film than an outer peripheral surface of the divided roller. The stretch wrapping machine according to claim 1, comprising: