KR102490694B1 - Apparatus for supplying wrapping paper for components packing system - Google Patents

Abstract

The present invention relates to a wrapping paper supply device for a parts packaging system, comprising: a support wall (10) having an upright flat plate structure; a one-end reel 20 connected to one end of the lower end of the support wall and having a wrapping support end wound around an outer circumferential surface thereof; a first guide roller (30) disposed rotatably on one side of an upper end of the support wall above the fabric reel and guiding the wrapping support end; a second guide roller 40 axially rotatably disposed on one side of the upper end of the support wall, which is one side of the first guide roller in a lateral direction, and guiding the pavement support end through the first guide roller; a direct descending guide roller 50 axially rotatably disposed on one side of the upper end of the support wall, which is one side of the second guide roller in a lateral direction, and guiding the pavement support end vertically downward through the second guide roller; and a wrapping paper sealing auxiliary tube 60 disposed below the direct descending guide roller and wrapped around the outside of the supplied wrapping support end before sealing to form two layers. Therefore, it is possible to prevent wrinkles from occurring in the packaging support stage in advance, thereby minimizing product defects and improving productivity, and in addition, the fabric reel is moved in the direction of the support wall, and the packaging support stage supplied By allowing the position of the width to be finely adjusted, as a result, it is possible to obtain effects such as being able to prevent the occurrence of defects in sealing the wrapping paper in the final stage.

Description

Wrapping paper supply device for parts packaging system {APPARATUS FOR SUPPLYING WRAPPING PAPER FOR COMPONENTS PACKING SYSTEM}

The present invention relates to a wrapping paper supply device for a parts packaging system, and more particularly, to supply wrapping paper for a parts packaging system in which a wrapping support end is supplied in a taut state from a reel of fabric on which a wrapping support end is wound to an auxiliary wrapping paper sealing tube at the final point. It's about the device.

In general, a wrapping paper supplying device refers to a device that automatically and smoothly supplies to a destination while winding a flat sheet-shaped packaging support end in a separate winding device and then properly unwinding the wrapping paper.

As an example, schematically looking at the fabric supply device of the prior art, a fabric supply unit provided to supply processed fabric, and spaced apart from the other side of the fabric supply unit, a support is provided perpendicular to the ground, and an upper side of one side of the support A tension support support extending toward the fabric supply side is formed, and one side of the tension support is provided with a tension support roller receiving fabric and a support target roller receiving fabric passing through the tension support roller, and spaced apart from the support roller. On the other side of the lower part, a missing mark detection sensor is provided that detects a sewing line or pattern formed on the processed fabric and transmits a signal, and an opener that spreads the fabric passing through the support roller is provided at the lower part spaced from the missing mark detection sensor. , The lower part of the opener has a structure including a sensing unit provided with a support lower roller for receiving the fabric that has passed through the opener, and a plurality of transfer rollers that are spaced apart on the other side of the sensing unit and promote the transfer of the fabric. there is.

However, the fabric feeding device of the prior art is such that the fabric to be unwound from the fabric supply unit is transported to a desired location through various rollers, and a separate means for maintaining the tension while the fabric is being transported is provided as well as the supplied fabric. Since there is no means for adjusting the position in the width direction of the fabric, as a result, wrinkles are formed while the fabric is supplied, resulting in defects, and also, it is impossible to adjust the width of the fabric to be supplied. As a result, this also had problems such as ultimately leading to defective finished packaging.

Republic of Korea Patent No. 10-2112453

The present invention has been made to solve this problem, and while appropriately applying a load to the supplied packaging support stage, the packaging support stage is supplied in a tight state from the fabric reel on which the packaging support stage is wound to the wrapping paper sealing auxiliary tube at the final point. Its purpose is to provide a wrapping paper supply device for a parts packaging system.

Another object of the present invention is to provide a wrapping paper supply device for a parts packaging system that allows a fabric reel to move in and out in the direction of a supporting wall so that the width of the supplied wrapping support end can be finely adjusted.

In order to achieve the above object, a wrapping paper supply device for a parts packaging system according to an embodiment of the present invention includes a support wall having an upright flat plate structure; A one-piece reel connected to one end of the lower end of the support wall and having a wrapping support end wound around the outer circumferential surface; a first guide roller disposed rotatably on one side of an upper end of the support wall above the fabric reel and guiding the wrapping support end; a second guide roller axially rotatably disposed on one side of the upper end of the support wall, which is one side of the first guide roller in a lateral direction, and guiding the pavement support end through the first guide roller; a direct descending guide roller axially rotatably disposed on one side of the upper end of the support wall, which is one side of the second guide roller in a lateral direction, and guiding the pavement support end vertically downward through the second guide roller; and a wrapping paper sealing auxiliary tube disposed below the direct descending guide roller and wrapping the supplied packing support end to the outside before being sealed to form two layers.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, the one-piece reel allows the wrapping support ends to advance and retreat in the direction of the supporting wall so that the wrapping paper sealing auxiliary tube body is wrapped so that the wrapping support ends are aligned with each other. Advance and retreat control means for adjusting the length of the overlapping ends may be further provided.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, the advance and retreat control means has a screw groove provided on one side of the support wall, and the one-piece reel has a tubular structure having a hollow, It penetrates the hollow of the raw material reel and is disposed with a bearing interposed between the inner circumferential surface of the hollow, and a screw thread is provided at one end to advance and retreat by being threaded with the screw groove of the support wall, and the other end extends to the outside of the hollow of the raw material reel. It may include a rotational shaft having a handle that is rotated in a protruding state.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, the first guide rollers are disposed in a state of contact with each other in the vertical direction and the first auxiliary guide roller rotates in a direction in which they are engaged with each other. may be more provided.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, the first guide roller and the first auxiliary guide roller perforate the surface of the wrapping support end so that air rises into the sealed finished wrapping paper later. A wrapping paper expansion prevention means for preventing swelling may be further provided.

In addition, in the wrapping paper supply device for a component packaging system according to an embodiment of the present invention, the wrapping paper expansion preventing means is provided on one side of the outer circumferential surface of either the first guide roller or the first auxiliary guide roller on the surface of the wrapping support end. A drilling needle for drilling may be provided, and an accommodation groove for accommodating the drilling needle may be provided on one side of another outer circumferential surface corresponding to the drilling needle.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, the wrapping support end progressing through the first guide roller is moved to the second guide roller between the first guide roller and the second guide roller. An anti-wrinkle means may be further provided so that the wrapping support end can be supplied in a taut state by preventing it from being loosened and wrinkled during supply.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, the wrinkle preventing means is provided with a horizontal support roller that rotates in place on one side of the same height of the first guide roller, and the first guide roller A load for maintaining a tight state between the horizontal support roller and the horizontal support roller by applying a load on the pavement support end in a state of being placed on the upper surface of the pavement support end going to the second guide roller on one lower side between the guide roller and the horizontal support roller A pressure roller may be further provided.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, a pair of guide rails are provided on both sides of the load-pressing roller so that both ends go up and down along the guide rails, and the guide rails Each position sensor is provided at a certain height interval up and down, and while the load-pressing roller moves up and down between the position sensors in a state of being placed on the pavement support stage, the load-pressing roller descends by its own weight and When detected by the position detection sensor, the operation of the first guide roller is stopped so that the supply of the wrapping support end from the fabric reel is stopped, and the second guide roller is operated to pull the wrapping support end while simultaneously pulling the load. The pressure roller is also lifted upward together, and when the load pressure roller is lifted and detected by the position sensor at the top, the first and second guide rollers are operated to resume supply of the wrapping support end from the fabric reel. At the same time, the pavement support end supplied to the second guide roller may be automatically controlled so that the pavement support end is supplied in a taut state while being pressed downward by downward pressure by the weight of the load-pressing roller.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, the second guide rollers are arranged in a state of contact with each other in the horizontal direction and the second auxiliary guide roller rotates in a direction in which they are engaged with each other. may be more provided.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, the wrapping support end, which advances to the direct descending guide roller through the second guide roller, is guided in a vertical zigzag manner to assist in sealing the wrapping paper A vertical support roller that pivots in place may be further provided at one side of the second guide roller on the same straight line downward so that the wrapping support end guided directly under the tube body is maintained in a taut state.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, the initial packaging shape is pushed so that both ends in the width direction are folded while facing each other by pushing the central portion of the wrapping support end having a flat plate shape on one side of the wrapping paper sealing auxiliary tube. A wrapper folding inducer that induces may be further provided.

In addition, in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, the wrapping paper folding inductor is disposed at the upper end of the wrapping paper sealing auxiliary tube body, and the upper side of the wrapping support end supplied is wide and tight at both ends in the width direction It may be of a conical structure with upper and lower sides so that both ends in the width direction are narrowed downward in a rounded state and supplied in a straightened state to the fusion splicer.

As described above, the wrapping paper supply device for a parts packaging system, which is an embodiment of the present invention, while appropriately applying a load to the supplied packaging support stage, wraps the packaging support stage from the original reel on which the packaging support stage is wound to the wrapping paper sealing auxiliary tube at the final point. By supplying it in a taut state, it is possible to prevent wrinkles from occurring on the packaging support end in advance, thereby minimizing product defects and improving productivity.

In addition, by allowing the fabric reel to move in and out in the direction of the supporting wall, the width position of the supplied packaging support end can be finely adjusted, which prevents the occurrence of defects in sealing the wrapping paper at the final stage, which also improves productivity as well as prompt response It is possible to obtain effects such as being able to improve competitiveness according to manipulation.

1 is a perspective view showing a wrapping paper supply device for a parts packaging system according to an embodiment of the present invention.
2 is a schematic view showing an operating state of a one-piece reel in a wrapping paper supply device for a parts packaging system according to an embodiment of the present invention.
3 is a schematic view showing a perforator needle of a first auxiliary guide roller and a receiving groove of a first guide roller in a wrapping paper supply device for a parts packaging system according to an embodiment of the present invention.
4 is a schematic diagram illustrating a process of unwinding a wrapping support end from a fabric reel while a load-pressing roller descends by its own weight in a wrapping paper supply device for a parts packaging system according to an embodiment of the present invention.
5 is a process in which a load-pressing roller presses the wrapping support end downward by its own weight while the wrapping support end is in the sealing step in the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention so that the wrapping support end is tightened. is a schematic diagram showing

Hereinafter, the present invention will be described based on the accompanying drawings.

As shown in FIGS. 1 to 5, a wrapping paper supply device for a parts packaging system according to an embodiment of the present invention includes a support wall 10, a fabric reel 20, a first guide roller 30, and , It includes a second guide roller 40, a direct descending guide roller 50, and a wrapping paper sealing auxiliary tube body 60.

The support wall 10 has a wall structure of an upright flat plate, and includes the one-piece reel 20, the first guide roller 30, the second guide roller 40, the direct descending guide roller 50, and the wrapping paper. It has a function for installing and supporting the sealing auxiliary tube body 60.

The fabric reel 20 has a reel shape in which one end is connected to one side of the lower end of the support wall 10 and the packaging support stage is wound on the outer circumferential surface, and the fabric reel 20 has the flat plate structure. ) advances and retreats in the direction of the support wall 10, so that the wrapping paper sealing auxiliary tube 60 is wrapped around the wrapping paper support end 5, and for adjusting the length of overlapping ends of the wrapping support ends 5 are provided.

Here, the advance and retreat control means has a screw groove 11 provided on one side of the support wall 10, and the one-piece reel 20 has a tubular structure having a hollow 21, and the one-piece reel 20 A screw thread that passes through the hollow 21 of the hollow 21 and is disposed with the bearing 22 interposed between the inner circumferential surface of the hollow 21 and is engaged with the screw groove 11 of the support wall 10 at one end to advance and retreat ( 23a) is provided and has a structure including a rotating shaft 23 having a handle 23b rotated in a state in which the other end protrudes out of the hollow 21 of the fabric reel 20.

The first guide roller 30 is rotatably disposed on one side of the upper end of the support wall 10 above the fabric reel 20 and has a roller structure for guiding the wrapping support end 5.

In addition, the first guide roller 30 is disposed in a state of contact with each other in the vertical direction, and a first auxiliary guide roller 31 having the same roller structure rotated in the direction in which the first guide roller 30 engages with each other is provided.

In addition, the first guide roller 30 and the first auxiliary guide roller 31 perforate the surface of the wrapping support end 5 to prevent expansion of the wrapping paper to prevent air from rising and swelling into the sealed finished wrapping paper later. Means are in place.

More specifically, the wrapping paper expansion prevention means is a perforating needle for perforating the surface of the wrapping support end 5 on one side of the outer circumferential surface of any one of the first guide roller 30 and the first auxiliary guide roller 31 ( 31a) is provided, and a concave receiving groove 30a is provided on one side of the outer circumferential surface corresponding thereto to accommodate the drilling needle 31a.

And, between the first guide roller 30 and the second guide roller 40, while the pavement support end 5 progressing through the first guide roller 30 is supplied to the second guide roller 40 An anti-wrinkle means is provided to prevent wrinkles from being loosened so that the wrapping support end 5 can be supplied in a taut state.

Here, the anti-wrinkle means is provided with a horizontal support roller 32 that rotates in place on one side of the same height of the first guide roller 30, and the first guide roller 30 and the horizontal support roller 32 A state in which a load is applied on the pavement support end 5 in a state of being placed on the upper surface of the pavement support end 5 that advances to the second guide roller 40 on one side below the gap between the horizontal support roller 32 and the tensioned state A load pressing roller 33 is provided so that is maintained.

More specifically, the load-pressing roller 33 is provided with a pair of guide rails 34 on both sides so that both ends ride up and down along the guide rails 34, and the guide rails 34 are spaced apart at a certain height. Position sensors 35 and 36 are provided, respectively, while the load-pressing roller 33 moves up and down between the position sensors 35 and 36 in a state of being placed on the pavement support end 5. , When the load-pressing roller 34 descends by its own weight and is detected by the position sensor 35 at the lower end, the operation of the first guide roller 30 is stopped, and the wrapping support end from the original reel 20 ( 5) in a state where the supply is stopped, the second guide roller 40 is operated to pull the pavement support end 5 and simultaneously lift the load pressing roller 33 upward together, and press the load When the roller 33 is lifted and detected by the position sensor 36 at the top, the first and second guide rollers 30 and 40 are operated to supply the wrapping support end 5 from the fabric reel 20. At the same time as this is resumed, the pavement support end 5 supplied to the second guide roller 40 is pressed downward by the downward pressure by the weight of the load-pressing roller 33, so that the pavement support end 5 is taut. It is made in an automatic control way so that it can be supplied in the state.

The second guide roller 40 is axially rotatably disposed at one side of the upper end of the support wall 10, which is one side of the lateral direction of the first guide roller 30, and the pavement support end through the first guide roller 30 It has a roller structure that guides (5).

In addition, the second guide roller 40 is provided with a second auxiliary guide roller 41 having the same roller structure that is disposed in a state of contact with each other in the horizontal direction and rotates in a direction in which the second guide roller 40 engages with each other.

Further, below the second guide roller 40, the wrapping support end 5, which advances to the direct descending guide roller 50 through the second guide roller 40, is guided in a vertical zigzag manner to seal the wrapping paper. A vertical support roller 42 that rotates in place is provided on one side of the second guide roller 40 on the same straight line so that the wrapping support end 5 guided directly down to the auxiliary tube body 60 is maintained in a taut state.

The direct descending guide roller 50 is axially rotatably disposed at one side of the upper end of the support wall 10, which is one side of the second guide roller 40 in the lateral direction, and the pavement support end through the second guide roller 40. It performs the function of guiding (5) vertically downward.

The wrapping paper sealing auxiliary pipe body 60 is disposed below the direct descending guide roller 50 and wrapped around the outside of the wrapping paper sealing auxiliary pipe body 60 before the supplied wrapping support end 5 is sealed by a separate fusion splicer or the like. It has an upright tubular structure to perform the function of assisting in forming two layers.

In addition, at one side of the upper end of the wrapping paper sealing auxiliary tube body 60, the central portion of the wrapping support end 5 having a flat plate shape is pushed toward the center of the supporting wall 10 so that both ends in the width direction are directed toward the outside of the supporting wall 10. There is provided a wrapping paper folding inducer 70 for inducing an initial wrapping shape so as to face each other toward each other and be folded.

Here, the wrapping paper folding inductor 70 is disposed at the upper end of the wrapping paper sealing auxiliary tube body 60, and the upper side of the wrapping support end 5 supplied is wide at both ends in the width direction and is tightly rounded. As both ends in the direction are narrowed, it is supplied in a flattened state to the fusion splicer and has a conical structure with an upper and lower narrow conical structure to ensure smooth fusion.

Looking at an example of using the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention having such a configuration is as follows.

First, the wrapping support end 5 of the fabric reel 20 passes between the first guide roller 30 and the first auxiliary guide roller 31 and rises again while supporting the bottom surface of the lower load-pressing roller 33. After riding the horizontal support roller 32 via the second guide roller 40 and the second auxiliary guide roller 41, riding the lower vertical support roller 42 again, the upper direct descending guide roller 50 Then, it is guided to the wrapping paper folding guide 70 and the wrapping paper sealing auxiliary tube 60 below.

After the arrangement of the packaging support stage 5 from the fabric reel 20 to the wrapping paper sealing auxiliary tube 60 is completed, the respective rollers are automatically controlled to continuously guide the packaging support stage 5.

And, when the folding length of the side end of the wrapping support end 5 reaching the wrapping paper sealing auxiliary tube 60 is misaligned, the handle 23b of the fabric reel 20 is rotated forward and backward to rotate the fabric reel 20. It is possible to accurately match the folded length of the side end of the pavement support end 50 by moving it in the direction of the support wall 10 .

In this way, the preparation for supplying the packaging support stage 5 is completed, and first of all, the packaging support stage 5 supplied from the fabric reel 20 is first between the first guide roller 30 and the first auxiliary guide roller 31 In the process of passing through the first auxiliary guide roller 31, the surface of the wrapping support end 5 is punctured by the perforating needle 31a formed on the outer circumferential surface to prevent air from rising and swelling into the sealed finished wrapping paper later. make it possible

Then, the pavement support end 5 progresses to the second guide roller 40 while passing through the load-pressing roller 33 provided below between the first guide roller 30 and the horizontal support roller 32 By applying a load to the upper surface of the support roller 32 to maintain a tight state between them, the paving support end 5 is supplied to the next step.

More specifically, while the load-pressing roller 33 moves up and down between the position sensors 35 and 36 in a state of being placed on the pavement support end 5, the load-pressing roller 34 is under its own weight. When it descends and is detected by the position sensor 35 at the lower end, the operation of the first guide roller 30 is stopped, and the supply of the wrapping support end 5 from the fabric reel 20 is stopped. The second guide roller 40 is operated to pull the pavement support end 5 and at the same time lift the load-pressing roller 33 upward together, and the load-pressing roller 33 is lifted to the upper end position. When detected by the detection sensor 36, the first and second guide rollers 30 and 40 are operated, and the supply of the wrapping support end 5 from the fabric reel 20 is resumed, and at the same time, the second guide roller 40 ), the paving support end 5 is pressed downward by the weight of the load pressing roller 33, so that the paving support end 5 can be supplied in a taut state.

Then, the pavement support end 5 passes through the lower vertical support roller 42 between the second guide roller 40 and the second auxiliary guide roller 41 so that it becomes taut again, and finally the upper It is guided to the wrapping paper sealing auxiliary tube 60 below through the direct descending guide roller 50, and then goes through a sealing step later.

On the other hand, in order to induce an overlapping shape in advance before the lateral ends of the wrapping support ends 5 overlap each other, the wrapping paper folding guide 70 provided at the top of the wrapping paper sealing auxiliary tube body 60 passes through the flat-plate package. By pushing the central portion of the support end 5 toward the center of the supporting wall 10, the initial pavement shape is induced such that both end portions in the width direction face each other toward the outside of the supporting wall 10 and are folded.

Then, the wrapping paper support stage 5 is finally guided to the wrapping paper sealing auxiliary tube 60 and then sealed to complete the wrapping paper supplying operation of the present invention.

As described above, the wrapping paper supply device for a parts packaging system according to an embodiment of the present invention, while appropriately applying a load to the supplied packaging support stage, wraps the packaging support stage from the original reel on which the packaging support stage is wound to the wrapping paper sealing auxiliary tube at the final point. By supplying it in a taut state, it is possible to prevent wrinkles from occurring on the packaging support end in advance, and accordingly, it is possible to improve productivity by minimizing product defects.

In addition, by allowing the fabric reel to move in and out in the direction of the supporting wall, the width position of the supplied packaging support end can be finely adjusted, which prevents the occurrence of defects in sealing the wrapping paper at the final stage, which also improves productivity as well as prompt response Competitiveness can be improved through manipulation.

As described above, one embodiment of the present invention has been described, but based on this, those skilled in the art can add, change, Various modifications and changes may be made to the present invention by deletion or addition, and this will also be included within the scope of the present invention.

5: pavement support 10: support wall
11: screw groove 20: fabric reel
21: hollow 22: bearing
23: axis of rotation 23a: thread
23b: handle 30: first guide roller
30a: receiving groove 31: first auxiliary guide roller
31a: perforation needle 32: horizontal support roller
33: load press roller 34: guide rail
35, 36: position sensor 40: second guide roller
41: second auxiliary guide roller 42: vertical support roller
50: direct descent guide roller 60: wrapping paper sealing auxiliary tube
70: wrapping paper folding derivative

Claims (7)

a support wall having an upright plate structure;
A one-piece reel connected to one end of the lower end of the support wall and having a wrapping support end wound around the outer circumferential surface;
a first guide roller rotatably disposed on one side of an upper end of the support wall above the fabric reel and guiding the wrapping support end;
a second guide roller axially rotatably disposed on one side of the upper end of the support wall, which is one side of the first guide roller in a lateral direction, and guiding the pavement support end through the first guide roller;
a direct descending guide roller axially rotatably disposed on one side of the upper end of the support wall, which is one side of the second guide roller in a lateral direction, and guiding the pavement support end vertically downward through the second guide roller; and
A wrapping paper sealing auxiliary tube arranged below the direct descending guide roller and wrapped around the outside before the supplied packing support end is sealed to make it double,
The fabric reel further includes advance and retreat control means for adjusting the length of overlapping ends of the wrapping support ends that surround the wrapping paper sealing auxiliary tube by advancing and retracting the wrapping support ends in the direction of the supporting wall. Wrapping paper supply device for parts packaging system. delete According to claim 1,
The advance and retreat control means,
A screw groove is provided on one side of the support wall,
The one-piece reel has a tubular structure having a hollow,
It penetrates the hollow of the raw material reel and is disposed with a bearing interposed between the inner circumferential surface of the hollow, and a screw thread is provided at one end to advance and retreat by being threaded with the screw groove of the support wall, and the other end extends to the outside of the hollow of the raw material reel. A rotating shaft having a handle that is rotated in a protruding state;
Wrapping paper supply device for parts packaging system comprising a. According to claim 1,
The first guide rollers are disposed in a state of contact with each other in the vertical direction and a first auxiliary guide roller axially rotated in the direction of engagement with each other is further provided. According to claim 1,
Between the first guide roller and the second guide roller, the wrapping support end progressing through the first guide roller is supplied in a taut state by preventing the wrapping support end from being loosened and wrinkled while being supplied to the second guide roller. A wrapping paper supply device for a parts packaging system, characterized in that an anti-wrinkle means is further provided so as to be. According to claim 1,
The second guide rollers are disposed in a state of contact with each other in the horizontal direction and a second auxiliary guide roller axially rotated in the direction of engagement with each other is further provided. According to claim 1,
The second guide roller so that the wrapping support end, which advances to the direct descending guide roller through the second guide roller, is guided in a vertical zigzag manner so that the wrapping support end guided directly down to the wrapping paper sealing auxiliary tube body is maintained in a taut state. A wrapping paper supply device for a parts packaging system, characterized in that a vertical support roller that rotates in place on one side of the same straight line is further provided.

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