JPS58130852A - Tension adjusting device of belt-like member - Google Patents

Abstract

PURPOSE:To eliminate a damage of a film and also to prevent the snaking of the film by arranging a reversing roller with a dancer roller so as to stabilize the tension applied to the film in a plastic film feed unit of a packing bag production device. CONSTITUTION:A reversing roller 12 and a dancer roller 16 are arranged in a tension adjusting mechanism 10 adjusting the tension of a film 1 in addition to a free roller 13. According to this constitution, when the film 1 is in a state likely to generate a slack, the dancer roller 16 is descended so as to prevent the slack of the film 1 effectively. In addition, the film 1 is stopped during machining by a machining mechanism 5, however no tensile action toward the transfer direction of the film 1 is applied by the reversing roller 12 at this time, thus only a predetermined minor tension is applied to the film 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the tension of a belt-shaped member during the transportation process, and in particular, to a device for adjusting the tension of a belt-shaped member such as a plastic film during transportation so as to maintain appropriate tension in the transportation direction. The present invention relates to a tension adjustment device for a band-shaped member, which is large in order to increase the tension, while reducing the tension on the side opposite to the transport direction so as not to interfere with the processing of the band-shaped member.

In recent years, glass bags have been widely used as packaging materials because they are hygienic and can be mass-produced at low cost. Also, how about folding the continuous band-like member of a plastic bag each time? It has also been proposed to store the paper in a box or the like, and to take it out and use it one by one as needed, like the Bog-Arag type Teishupeno arm (I￥f Application No. 168412/1986). I like this! In order to manufacture plastic bags of the same type, a tube-shaped plastic film that is folded flat is supplied from the raw material, perforated and heat-sealed at predetermined lengths, and then folded into pieces one after another. However, when folding, the band-like member tends to become loose, which hinders proper folding.

This is different from winding up the strip using a roller-like winder, etc. When the strip is folded,
The movement of the strip material is a double track with frequent changes in direction, so if the strip material is constantly fed to the folding mechanism at a constant speed, the strip material will not have the appropriate tension and will be oversupplied. This is because it happens.

Normally, in order to prevent the belt-like member from sagging during the transportation process, a so-called dancer mechanism is used, which is configured to mutually hang and rotate the belt-like member between a group of fixed pulleys and a group of movable pulleys for yarancing. In the dancer mechanism, which is generally used, tension is applied not only to the belt-like member on the side in the transport direction of the dancer mechanism, but also on the belt-like member on the opposite side to the transport direction. Therefore, the anti-transfer direction (
11 (in the case of applying perforation processing, heat sealing processing, etc. to the glass film as a band-shaped member,
Tension toward the dancer mechanism will act on the glass film during processing, which may prevent the processing from being done in the correct position, or the melted area may be pulled by a large force, causing the sealing process to fail. Therefore, it was not possible to use a dancer mechanism.

For this reason, the present applicant has already proposed a device that adjusts the tension of the belt-like member so as to apply tension only to the belt-like member on the side of the belt-like member in the transport direction (l!
6-89192). This previously proposed device includes a reversing roller that rotates in a direction opposite to the direction in which the belt-shaped member is transported, and a suppression roller that clamps the belt-shaped member between the reversing roller and the reversing roller while abutting against the reversing roller with a predetermined pressing force. However, since the belt-like member is brought into local contact at the location where it is held between the two rollers, there is a risk of damaging the belt-like member. Furthermore, the tension of the strip member on the side opposite to the transfer direction of the reversing roller is not necessarily stable, and the transfer state tends to become unstable, which may cause meandering of the strip member during transfer. .

An object of the present invention is to maintain a high tension in the belt-shaped member in the transport direction, while reducing tension in the belt-shaped member in the opposite direction, without damaging or meandering the belt-shaped member during transport. It is an object of the present invention to provide a tension adjustment device that can stably adjust the tension of a band-like member that is becoming smaller.

The present invention provides a reversing roller around which a belt-shaped member is wound and which rotates in a direction opposite to the direction in which the belt-shaped member is transported, and operates this reversing roller while the belt-shaped member is being transported to apply tension only to the belt-shaped member on the transporting direction side. The above objective is achieved by increasing the directional stability of the belt-shaped member during transport while increasing the number of belt-shaped members and by providing a dancer roller on the side opposite to the transport direction of the reversing roller to prevent the belt-shaped member on the side opposite to the transport direction from loosening. It is something.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment in which the belt-shaped member tension adjusting device according to the present invention is applied to a belt-shaped member folding device. After the original fabric 2 is wound up at a predetermined speed by a take-up roller 3, it is supplied to a processing mechanism 5 via three lifting rollers and a guide roll 4. In addition, the lifting roller 3
A can be raised and lowered freely, and its own weight applies a slight tension to the plastic film 1.

After the plastic film IK is subjected to predetermined perforations and heat sealing in the processing mechanism 5, it is supplied to the belt-shaped member tension adjustment device 10 according to the present invention.

This belt-shaped member tension adjustment device 10 is shown enlarged in FIG. A reversing roller 12 is provided. This reversing roller 12 is driven by a drive motor (not shown) and is constantly rotated in the opposite direction to the transport direction of the plastic film 1, and the surface of this reversing roller 11 is a smooth metal surface. This prevents the surface of the glass film 10 formed and wound from being damaged. In addition, a free roller 13 is rotatably provided at a predetermined interval near the bottom III of the reversing roller 12 between the brackets 11.
The glasstic film 1 wound around is also wound around this free roller 13, so that the film 1 is brought into surface contact with the reversing roller 12 over a relatively wide range, and the winding on the reversing roller 12 is The amount is kept approximately constant.

One row 14 is provided at a predetermined position on the -@ edge of each of the two brackets 11, and these pillows 14
A swing arm 15 made of a metal rod or the like is swingably supported. A dancer roller 16 having a flange 16A is rotatably provided between one end of the swinging arm 15 attached to each platen 11, and a lance weight is provided at the other end of the swinging arm 15. 17 is attached via a mounting screw 17A so that the mounting position can be adjusted. Further, this dancer roller 16 is connected to the elevating row 23.
It is said to be slightly lighter than A.

A swing range regulating device is provided on the side edge of one of the brackets 11 of the two platens 11 opposite to the side edge where the pillow 14 is provided, that is, the side edge where the dancer roller 16 is placed. 21 are provided. This swing range regulating device 21 has an upper strut 23 and a lower strut 424 that can come into contact with the forearm 15, and when the screwing position of the strut 423 e24 to the threaded rod 22 is adjusted. The upper and lower limits of the swing of the swing arm 15 across K are regulated.

A folding IL device 30 is provided below the tension adjusting device 10 for continuously folding the plastic film l into a predetermined folding width. This folding device 30 includes the tension adjustment device 1
2 that clamps the plastic film 1 that is supplied by 0
A holding roller 31 that reciprocates between the book's 7-lead rollers and the folding end, and a plastic film 1t that is arranged at both folding end positions and is opened and closed as appropriate to be supplied by the holding roller 31. It has an opening/closing wing 32 that folds, and a pedestal 33 that gradually lowers as the amount of folding increases when the plastic film 1 that is folded in the ψ order is laminated.

Next, the operation of this embodiment will be explained.

One end of the plastic film 1 is pulled out from the original film 2 and wound around a take-up roller 3, a lifting roller 3, a guide roll 4, and then passed through a processing mechanism 5 to a dancer roller 16, a reversing roller 12, and a free roller of a tension adjustment mechanism 10. 13, and then the holding roller 31 of the folding device 30.
Let the time pass.

In order to ensure that all the perforations made by the processing mechanism 5 are accurately overlapped at the center position of the folded glass film 1 on the pedestal 33, the holding roller 31 must be moved back and forth. When the plastic film 1 is located at one dead point of the movement and is folded on the pedestal 33, from the perforation at the uppermost position to the processing mechanism 5 from the perforation at the uppermost position toward the raw material 2 side. The position of the upper stop horn 423 of the swing range regulating device 21 is adjusted so that the length of the plastic film l is an integral multiple of the predetermined interval between the perforations of the plastic film 1, and the processing mechanism 5 is operated. For example, when perforating the plastic film 1 every 340 mm, when the pinching roller 31 is at one dead center position, When the length from the perforation of the topmost plastic film l to the processing mechanism 5 is an integral multiple of 340, for example 1020, which is equivalent to 3 times, the processing mechanism 5 operates and the plastic film IK sewing machine The operation timing of the processing mechanism 5 is adjusted while glancing at the swing range regulating tool 21 so that the eyes are processed.

When the folding operation is started while feeding the glass film 1 from the original roll 2, the clamping roller 31 starts to fluctuate from one dead center to the other dead center, and the glass film 1
is shifted to the state in which slack is most likely to occur, but since the part of the plastic film 1 is wound around the reversing roller 12, no slack will occur between the free roller 13 and the holding roller 31. It looks like this.

Furthermore, at the moment when the processing mechanism 5 perforates the plastic film 1, the holding roller 31 is located at one dead center of its reciprocating motion, so the part to be processed on the plastic film 1 is stopped. Since the reversing roller 12 does not pull the workpiece in the transport direction during processing, no extra force is applied to the film 1 during perforation or heat sealing, and the dancer roller 16 A slight tension is applied to the film 1 located between the dancer roller 16 and the lifting row 23, which is slightly heavier, so that the processing in the processing mechanism 5 is carried out very appropriately.

When the glass film 1 between the reversing roller 12 and the clamping roller 31 is in a state where it is easy to loosen, that is, while the clamping roller 31 is moving from one dead center to the other dead center, the processing mechanism Although the glass film 1 between the processing mechanism 5 and the reversing roller 12 is likely to loosen, the dancer roller 16 provided between the processing mechanism 5 and the reversing roller 12 is lowered, and the film 1 is loosened between the processing mechanism 5 and the reversing roller 12. Slack is effectively prevented. It should be noted that the plastic film 1 is always wound around the circumferential surface of the reversing roller 12 by the dancer roller 16 over a predetermined range or more in a state of surface contact.

Further, the directional stability of the plastic film 1 between the processing mechanism 5 and the reversing roller 12 is enhanced by the dancer roller 16, and in particular, since the dancer roller 16 is provided with the flange 16A, the directional stability of the film 1 is increased. further enhanced,
In Film 1, no snakes or lines occur.

This embodiment has the following effects.

Appropriate tension is always applied to the plastic film 1 on the folding device 30 side from the tension adjustment device 10, and a weak tension is applied to the plastic film 1 in the processing mechanism 5flll from the tension adjustment device 10 to ensure proper processing. Since no extra tension is applied other than the tension, the folding device 30
There is an effect that both the folding operation in and the processing operation in the processing mechanism 5 are performed properly. That is, the film 1 being processed in the processing mechanism 5 will not be pulled and the processing will not fail, and the folding device 30 will not cause wrinkles in the film 1.

Further, since the film 1 is always wound around the reversing roller 12 in surface contact over a predetermined range or more by the dancer roller 16, the reversing roller 212 and the film 1 are never brought into local contact.

Therefore, there is an effect that the film 1 is less likely to be scratched. Furthermore, the directional stability of the film 1 is significantly improved by the dancer roller 16, and meandering phenomenon does not occur during transport, so that not only the processing mechanism 5 but also the folding device 30 can be properly folded. There is an effect.

In addition, the overall structure is simple and small,
It can be easily installed and utilized.

In the above embodiment, the tension adjustment device 10 is installed between the processing mechanism 5 and the folding device 30, but the tension adjustment device 10 is not limited to this.
In short, it can be widely applied when it is required to increase the tension on the side of the belt-shaped member in the transport direction and to reduce the tension on the side opposite to the transport direction. For example, the processing mechanism 5 is used for perforation processing, etc. It is not something that does--
Alternatively, instead of the folding device 30, a simple winding device for the processed band-like member may be provided.

Further, the reversing row 212 is not limited to a metal rod with a smooth surface, but may be made of a material coated with heat-shrinkable resin, for example. Alternatively, if the tension of the belt-shaped member on the side in the direction of the transfer force is to be increased, a rubber roller or other material with a large frictional force may be used, or several reverse rollers may be provided.

Furthermore, although the dancer roller 16 is provided with the flange 16A, the flange 16A is not necessarily necessary, but the meandering of the film 1 can be more effectively prevented if the flange 16A is provided. It has the effect of

As described above, according to the present invention, without damaging or meandering the belt-like member during transport, the tension is large on the belt-like member on the side facing the transporting force, and the tension is large on the side facing the transporting force. Regarding the band-shaped member, there is an effect that the tension of the band-shaped member can be stably adjusted so that the tension becomes small.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the overall configuration when an embodiment of the belt-shaped member tension adjustment device according to the present invention is applied to a belt-shaped member folding device, and FIG. 2 is an enlarged view showing the main parts of the embodiment. It is a front view. 1...Glasstic film as a strip member, 5.
... Processing mechanism, 10... Tension adjustment device, 12... Reverse roller, 16... Dancer roller, 30... Folding device for band-like member, 31... Clamping roller. Agent Patent Attorney Minoru Kinoshita Figure 1 Figure 2 ＼, Ha ＼

Claims (1)

[Claims] (1) A reversing roller around which the belt-like member being transported is wound and rotating in a direction opposite to the transporting direction of the belt-like member, and a reversing roller located on the side opposite to the transport direction of the reversing roller and preventing the slack of the belt-like member due to its own weight. A belt-like member tension adjustment device 0 characterized by having a dancer roller that prevents