JPS6359938B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a feeding device for a plastic strip, and more particularly to a feeding device for feeding a plastic strip, such as a thermoplastic resin film or sheet, to a processing machine for secondary processing.

Plastic band-like members such as plastic films and sheets are widely used as various products after being subjected to so-called secondary processing such as printing, bag making, perforation, and perforation. The manufacturing of the band-shaped member and the secondary processing are performed in separate processes. In other words, a plastic strip is produced as a so-called raw material with a roll length of 300 m to 2,000 m and a weight of 30 kg to 40 kg for ease of handling, and this plastic strip is attached to various secondary processing machines to perform secondary processing. It is something. The processing speed of plastic strip-shaped members in secondary processing machines is usually 30 m/min ~
The speed is approximately 30 to 80 m/min even in bag making processing, which takes a relatively long processing time.
Therefore, processing for one roll of the original fabric is completed in 5 to 10 minutes, and it is necessary to frequently replace the original plastic strip member. Since this replacement work required the processing machine to be temporarily stopped, not only did the replacement work require a lot of effort, but the processing was frequently interrupted, resulting in a decrease in productivity. Ta. Furthermore, it has disadvantages such as the frequent occurrence of substandard products due to replacement of the original fabric.

Therefore, a device has been developed that detects the ending end of the currently supplied strip material and connects the starting end of the spare strip material material to this ending end. The original fabric was easily damaged during splicing, and reliable splicing could not be expected.

An object of the present invention is to be able to join a spare plastic strip material original fabric to an operational plastic strip material original fabric without stopping a processing machine for secondary processing, and to damage the original fabric when joining the original fabrics. To provide a feeding device for plastic strip members which can be reliably joined without causing any damage.

According to the present invention, a rotatable roller and a driving roller, and a guide roller and a stopper are arranged at a predetermined interval along the feeding direction of a working plastic strip member attached to an attachment mechanism, and between them. By providing a moving block that grips the starting end of the preliminary plastic strip member attached to the mounting mechanism and a slide piece equipped with a welding belt so as to be able to approach and separate from each other with the operating plastic strip member in between, It is an attempt to achieve a goal.

Specifically, the present invention includes a mounting mechanism capable of removably and rotatably attaching an operating plastic strip material original material and a spare plastic strip material material material, as well as mutually converting the mounting positions of the two materials; A feed roller that pulls out the working plastic strip material attached to the mechanism and sends it out to the processing machine; a detector that detects the end end of the working plastic strip member on the mounting mechanism side; a drive roller that is rotatably provided in contact with one surface of the moving plastic strip member on the feeding direction side of the strip member and that stops rotating when the end end is detected by the detector; A roller that is rotatable and displaceable in the axial direction of the drive roller is provided at a position facing the drive roller and the plastic strip member for operation, and a roller for displacing the plastic strip member for operation between this roller and the feed roller. A guide roller is rotatably provided in contact with the surface, and a guide roller is provided at a position opposite to the guide roller with the operating plastic strip member in between so as to be movable in a direction perpendicular to the feeding direction of the operating plastic strip member. a stopper that advances toward the guide roller when the terminal end is detected by the detector and clamps a moving plastic strip between the guide roller; and a stopper that extends between the drive roller and the guide roller. A moving block and a slide piece are provided so as to be movable toward and away from each other with a plastic strip member for operation in between, and are moved toward each other when the end end is detected by the detector, and the moving block rotates. a movable roller that grips the starting edge of the preliminary plastic strip between the gripping roller and the movable roller that is retracted from the gripping roller immediately before the gripping roller contacts the working plastic strip; and a welding belt rotatably provided on the slide piece.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a plastic strip member feeding apparatus according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall structure of the feeding device, and in this figure, a rectangular main body frame 2 and a workpiece attachment mechanism 3 for operation and backup are installed on a movable base 1. There is. This original fabric attachment mechanism 3
has a pair of substantially trapezoidal plate-shaped mounts 3A, on which a rotary arm 5 is rotatably supported via a rotating shaft 4 in a counterclockwise direction in the figure. rotating arm 5
An operating plastic strip material 6 is rotatably and removably attached to the upper end of the figure, and a spare plastic strip material 7 is attached to the lower end of the figure. The strip-like members of these raw fabrics 6 and 7 are made of polyethylene with a wall thickness of 8 to 250 μm;
A film or sheet made of a soft thermoplastic resin such as polypropylene, polystyrene, polycarbonate, or polyvinyl chloride, or a laminate of these resin films or sheets and paper or aluminum foil can be used. In addition, a gear 8 is provided on the rotating shaft 5.
A worm gear 9 is meshed with this gear 8, and when a handle 10 attached coaxially with the worm gear 9 is rotated, the rotating arm 5 is rotated counterclockwise in the figure. .

The transverse member 2A located at the upper part of the main body frame 2 has a photoelectric detector 12 for detecting the end end of the moving plastic strip member 11 from the moving plastic strip member raw material 6, and a photoelectric detector 12 for detecting the end end of the moving plastic strip member 11 from the moving plastic strip member raw material 6. Drive roller 1 sent to the processing machine (not shown) side
3. A cutter 14 that advances and retreats toward the strip member 11 to fuse and cut the strip member 11 as appropriate; an auxiliary roller 15 for making the cut by the cutter 14 more reliable; a welding mechanism 16; a stopper 17 that interlocks with the photoelectric detector 12; a guide roller 18, a dancer mechanism 19,
and feed rollers 20 are provided in sequence along the feeding direction of the moving plastic strip 11, respectively.

First and second moving rollers 21 and 22 are attached to the driving roller 13 and the auxiliary roller 15 so as to sandwich the strip member 11 therebetween. One end of the first and second moving rollers 21 and 22 is rotatably supported by a rectangular moving plate 26, and this moving plate 26 is vertically erected and supported by a small wheel 23 attached at the bottom. As shown in FIG. 2, it is configured to be able to retreat toward the front in the figure on a rail 25 laid on a protrusion 24 extending toward the front in the figure. Further, a fixed plate 27 is provided upright on the movable plate 26 so as to face each other with the belt-shaped member 11 in between. A bearing portion 28 is provided for bearing the end.

The moving plate 26 also includes third and fourth moving rollers 21A and 22A at predetermined positions below the first and second moving rollers 21 and 22.
One end is supported by a shaft, and when the movable plate 26 advances, the other end is supported by a bearing part 28 in the same way as the first and second movable rollers 21 and 22, and the starting end of the spare plastic strip material 7 is supported. The spare plastic strip 29 on the side is guided from below.

The cutter 14 located between the drive roller 13 and the auxiliary roller 15 is equipped with a nichrome wire and has a cutter 30 inside that can move forward and backward toward the strip member 11. When advancing, the cutter 14 cuts the strip member 11. It is configured to melt.

The welding mechanism 16 includes an outer frame 32 having a guide portion 31, a pair of slide pieces 33 that move forward and backward toward the strip member 11 along the guide portion 31, and a support shaft 34 that moves the slide pieces 33 back and forth. ing. The slide piece 33 is equipped with a welding roller 35 and a belt drive roller 36, which are provided with heating means (not shown).
are vertically supported in FIG. A strip member 11 for advancing and operating and a reserve strip member 29
When welding the belt-like members 11 and 29, the welding roller 35 and the welding belt 37 are rotated by the belt drive roller 36, so that the welding width of the belt-shaped members 11 and 29 becomes wider.

A gripping mechanism 38 is provided vertically below the welding mechanism 16 so as to sandwich the strip member 11 and face the welding mechanism 16.
is provided. The gripping mechanism 38 includes a column 3 vertically attached between the base 1 and the transverse member 2A.
9, the moving block 40 is configured to be able to move forward and backward toward the strip member 11 by means of an air cylinder 41 located at the lower part of the support column 39.

A gripping roller 41 is attached to the upper end of the moving block 40.
This gripping roller 41 is provided with a movable roller 42 which is movable in the vertical direction and can press, grip, and release the starting edge of the spare strip member 29 between the gripping roller 41 and the gripping roller 41. ing. The movable shaft roller 42 is equipped with a locking mechanism (not shown) so that it can rotate counterclockwise in the figure but cannot rotate clockwise, and the movable shaft roller 42 rotates vertically downward within the moving block 40. The movable shaft 43 is attached to the upper end of the movable shaft 43. The movable shaft 43 is biased vertically upward by a compression spring 44 interposed at the lower part of the movable shaft 43.
Further, a plate piece 45 is fixed to a substantially central position of the movable shaft 43. Further, an eccentric cam 46 is attached to a portion of the moving block 40 close to the plate piece 45, and when a lever 47 coaxially attached to the eccentric cam 46 is operated, the plate piece 45 is compressed by the eccentric cam 46. The gripping roller 41 and the movable roller 42 are configured to be pushed vertically downward against the biasing force of the spring 44, thereby separating the gripping roller 41 and the movable roller 42. However, even if the lever 47 is not operated, the moving block 4
Immediately before the gripping roller 41 comes into contact with the movable belt-like member 11 as the gripping roller 41 rises, a projecting piece 42A fixed to the movable shaft 43 is provided immediately below the movable roller 42.
is a stopper 39A fixed to a predetermined position on the support column 39.
The holding roller 41 and the movable roller 42 are separated from each other by coming into contact with the movable roller 42 to prevent the movable roller 42 from rising.

On the right side of the gripping mechanism 38 in the figure, there is a guide roller 18 that guides the movable band member 11 to the dancer mechanism 19.
The guide roller 18 can appropriately press and clamp the movable band member 11 between it and a roller-shaped stopper 17 to stop the feed to the dancer 19. Band member 1
1 is configured to be smoothly sent to the dancer mechanism 19.

The dancer mechanism 19 has a rectangular dancer frame 48 fixed to the transverse mechanism 2A and elongated in the vertical direction. A fixed roller group 49 consisting of a plurality of rollers arranged horizontally is provided at the upper end of the dancer frame 48, while a sliding member 50 that can slide up and down along the dancer frame 48 is provided at the lower side of the dancer frame 48. The sliding member 50 is provided with a vertically movable roller group 51 consisting of a plurality of rollers arranged horizontally, and the sliding member 50 is balanced by a weight (not shown) or the like. After the movable band member 11 is alternately wrapped around the rollers of the fixed roller group located above the dancer frame 48 and the rollers of the vertically movable roller group 51 located below, it is passed through the feed roller 20 as shown in the figure. Although the sliding member 5 is supplied to a processing machine that does not
0 is configured to be moved up and down by a slight change in the tension of the band-shaped member 11 that is stretched over it, and therefore even when the feeding of the band-shaped member 11 is stopped by the stopper 17, the vertical movement roller The group is configured to rise quickly and supply of the strip member 11 to the processing machine continues for a while. on the other hand,
When the stoppage of the feed by the stopper 17 is released, the vertically movable roller group 51 is configured to quickly descend and return to its original state.

Next, the operation of this embodiment will be explained.

An operating plastic strip material 6 and a spare plastic strip material 7 are attached in advance to the upper and lower ends of the rotating arm 5, respectively. Then, as shown in FIG. 1, the operational strip member 11 is guided through a predetermined path to a processing machine (not shown), while the starting end side of the preliminary strip member 29 is held by the gripping mechanism 3.
Hold it at 8. In this state, the supply of the strip member 11 to the processing machine is continued, and the end of the raw material 6 for operation is as follows.
It is detected by a photoelectric detector 12 which detects the passage of the end end. Note that the cutter 14 is used to cut off a bent portion or a tape-attached portion at the starting end of the original fabric 7.

As soon as the end end is detected, the drive roller 1
3 is stopped, and the stopper 17 is activated to stop feeding the band member 11 to the dancer mechanism 19. At the same time, the welding belt 37 of the welding mechanism 16
advances toward the strip member 11, while the gripping mechanism 3
The moving block 40 of No. 8 also advances toward the strip member 11, and the starting end side edge of the spare plastic strip member 29, which is held between the gripping roller 41 and the movable roller 42, and the movable strip member 11 are brought into pressure contact. Ru. At this time, the welding belt 37 is heated and rotated, so that the two strip members 11 and 29 are welded over the entire width in the width direction at the same time as the pressure welding, but the welding belt 37 is not rotated during welding. As a result, a sufficient width of the welded portion in the direction of feeding of the belt-shaped members can be obtained, and the welding of the belt-shaped members 11 and 29 can be ensured.

It should be noted that just before the strip members 11 and 29 are pressed together, the protruding piece 42A and the stopper 39A come into contact with each other to prevent only the movable roller 42 from rising.
The edge grip of 9 is open. Also, when welding by the welding belt 37, the welding belt 37
Since the amount of rotation of the belt 37 is from several mm to about 10 mm at most, the belt-like member 11 stretched between the movable roller 15 and the movable roller 22 and the guide roller 18 and the stopper 17 is free from wrinkles caused by the rotation of the belt 37. There will be no adverse effects such as generation or disconnection.

After welding of the belt-like member 11 and the belt-like member 29 is completed, the welding belt 37 and the gripping mechanism 38 are respectively retreated to their original positions. When the moving block 40 is lowered, the gripping roller 41 and the movable roller 42 are separated from each other until the protruding piece 42A and the stopper 39A are separated.
The edge of the welded band member 29 will not be pulled downward as the belt member 29 descends.

Note that when welding and retracting the welding mechanism 16 and the gripping mechanism 38 from the strip members 11 and 29, the auxiliary roller 15 on the left side of the welding location in FIG.
Since the strip member 11 is supported by the stopper 17 and the guide roller 18 on the right side by the second moving roller 22, the welding and the above-mentioned retreat can be performed reliably.

After the welding mechanism 16 and the gripping mechanism 38 are retreated, the movable plate 26 is moved along the rail 23 to a predetermined position on the near side in the figure by a motor or the like (not shown). When the moving plate 26 moves to a predetermined position, the rollers 21, 22, 21A, and 22A are no longer located below the strip members 11 and 29, as shown in FIG. In this state, the rotary arm 5 is reversed by operating the handle 10, and the positions of the spare roll 7 and the used working roll 6 are switched by a so-called turret method. It is assumed that the function of the photoelectric detector 12 is stopped during the switching operation.

After the switching operation, the moving plate 26 is returned to its original position, and the spare web 7 is used as a new working web to continue supplying the strip member to the processing machine. Further, only the core material of the used raw fabric remains at the lower end of the rotating arm 5, but this core material is removed and a new raw fabric is attached in its place. and,
Roller 21A rolls the starting edge of this new original fabric.
and 22A, and is guided to the gripping mechanism 38. In the gripping mechanism 38, the lever 47 is operated to separate the gripping roller 41 and the movable roller 42, and the starting edge of a new original fabric is inserted between these rollers 41, 42. When the lever 47 is released, the movable roller 42 is moved by the action of the compression spring 40.
rises and comes into contact with the gripping roller 41, and the edge thereof is gripped.

Note that during the operation of replacing the used working original fabric with the spare original fabric, the vertically movable roller group 51 in the dancer mechanism 19 is raised, and the supply of the strip member to the processing machine is continued without any hindrance. There is.

This embodiment has the following effects.

Since the original fabric can be replaced without stopping the supply of the strip member to the processing machine for secondary processing, a decrease in productivity due to replacement can be eliminated. Moreover, the frequent occurrence of non-standard products due to replacement is eliminated, and the band-like members can be used more effectively.

In addition, in a state where the operational strip member 11 is supplied, the moving block 4 holding the starting end of the spare strip member 29 is placed against the strip member 11.
0 and a slide piece 33 with a welding belt 37
Since they are spaced apart from each other, they do not come into contact with the strip-shaped member 11, and as a result, it is possible to prevent scratches or the like from occurring on the strip-shaped members 11 and 29.

Further, the end end of the strip member 11 is connected to the photoelectric detector 1.
2, the drive roller 13 is stopped and the stopper 17 is moved to the guide roller 18.
After that, the moving block 40 and the slide piece 33 move toward each other to press and weld the starting end of the spare strip member 29 to the operating strip member 11, that is, at the time of welding. ,
The movable band member 11 is maintained at a constant tension by the driving roller 13 and roller 21, the guide roller 18 and the stopper 17 on both sides of the welding part, so that welding can be performed reliably, and the movable block 40 and Since the slide pieces 33 come close to each other, no unreasonable force is applied to the strip member 11, and the welded portion can be neatly finished.

Further, since the gripping by the gripping roller 41 and the movable roller 42 in the gripping mechanism 38 is performed by pressure contact between the rollers, the gripping is ensured, and the gripping is automatically released when the movable block 40 is raised, so that after welding It is possible to reliably prevent a situation in which the edge of the band-shaped member 29 is inadvertently pulled.

Furthermore, the welding mechanism 16 is made of Teflon (trade name).
Since the welding belt 37 made of plastic is rotated during welding, not only does the melted plastic not adhere to the welding belt 37, but also a sufficient welding width is obtained, so that welding is performed reliably, and the welding is performed reliably. This has the effect of ensuring that switching is performed reliably.

In addition, since a cutter 14 is provided, it is possible to cut off the folded part at the beginning of the roll of the original fabric, adhesive tape, etc. without introducing it into the secondary processing machine. Even if the original roll is not completed, it is possible to switch to a spare original roll as needed.

In the above-described embodiment, the band members 11 and 29 are made of a soft thermoplastic resin with a wall thickness of 8 to 250 μm; however, depending on the welding ability of the welding mechanism 16, other thermoplastic resins may be used. You can also do it.

In addition, although it is assumed that the end end of the plastic strip member 11 for operation is detected by the photoelectric detector 12, detection is not limited to the photoelectric detector 12, but other detection methods such as a detector using static electricity, a mechanical detector, etc. It can also be a vessel.

Furthermore, it is convenient to provide an indicator lamp, a warning device, etc. to notify the completion of welding of the strip member, and to perform a switching operation in the original fabric attachment mechanism 3.

Further, the feeding of the strip member 29 from the spare web 7 is not performed until the rotating arm 5 is reversed and the original web 7 is positioned at the upper end of the rotating arm 5 as a new working web. However, it is also possible to send it out at a low speed immediately after welding is completed. However, in this case, a drive roller or the like for feeding out the preliminary web 7 is required.

As described above, according to the present invention, the operating plastic strip member and the spare plastic strip member can be joined together without stopping the processing machine for secondary processing, and the plastic strip member cannot be damaged during the joining. Therefore, it is possible to provide a feeding device for plastic strip-like members that can be reliably joined together without any problems.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the overall structure of an embodiment of the plastic strip supply apparatus according to the present invention, and FIG. 2 is an explanatory diagram showing the state of the plastic strip material replacement operation. 3... Original fabric attachment mechanism, 6... Original plastic strip member for operation, 7... Original fabric for plastic strip member for spare, 12... Photoelectric detector, 13... Drive roller, 17... Stopper, 18... ...Guide roller,
20...Feeding roller, 21...Moving roller,
33...Slide piece, 37...Welding belt, 40
...Moving block, 41...Gripping roller, 42...
...Operational roller.

Claims (1)

[Claims] 1. A mounting mechanism capable of removably and rotatably attaching the operating plastic strip material original material and the spare plastic strip material material material, and also capable of mutually converting the mounting positions of the two materials; a feed-out roller that pulls out the raw plastic strip material for operation and sends it out to the processing machine; a detector that detects the end end of the plastic strip member for operation on the mounting mechanism side; a drive roller which is rotatably provided in contact with one surface of the moving plastic strip member on the direction side and whose rotation is stopped when the end end is detected by the detector; rollers that are rotatable and displaceable in the axial direction of the drive roller at opposing positions across the operating plastic strip member;
A guide roller is rotatably provided between this roller and the feed roller in contact with one surface of the plastic strip member for operation, and a guide roller for operation is provided at a position opposite to the guide roller and the plastic strip member for operation. A plastic strip member for operation is provided so as to be movable back and forth in a direction orthogonal to the feeding direction of the plastic strip member, and when the end end is detected by the detector, the plastic strip member advances toward the guide roller and is disposed between the guide roller and the plastic strip member for operation. a stopper for sandwiching the driving roller and the guide roller, and a moving plastic strip member is provided between the drive roller and the guide roller so that they can approach and separate from each other, and the direction in which the rollers approach each other when the end end is detected by the detector; A moving block and a slide piece are moved to the moving block, a gripping roller is rotatably provided on the moving block, and the starting edge of the spare plastic strip member is gripped between the gripping roller and the gripping roller is activated. 1. A feeding device for a plastic strip-shaped member, comprising: a movable roller that is retracted from a gripping roller immediately before contacting the plastic strip-shaped member; and a welding belt rotatably provided on the slide piece.