JPS6153293B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joining device for flexible strips (hereinafter referred to as "webs") such as films and papers, and more specifically, the present invention relates to a so-called "web joining apparatus" for joining new and old webs by facing each other at their ends. The present invention relates to a preparation and supply mechanism for a bonding adhesive tape used in an automatic web bonding device that automatically performs butt bonding.

Conventionally, web joining methods include a polymerization method in which the joined ends of the webs are overlapped and joined together using a joining method such as adhesive tape or heat sealing, and a method in which the joined ends of the webs are butted against each other and then joined. There is a butt joining method in which tape or the like is attached to join. However, in the former case, because the joint is particularly thick and the entire joint is glued, there are major obstacles in subsequent handling, such as cutting the web or surface treatment of the web. In such cases, the latter method is generally adopted.

By the way, the above-mentioned butt joining methods that are generally known in the past can be divided into the following two types. One method is to cut the end of the old web and the tip of the new web separately, as disclosed in, for example, JP-A-49-98222 or JP-A-49-120076. The other method is to join the ends by butting them together, as disclosed in, for example, Japanese Patent Publication No. 49-33098 or Japanese Patent Publication No. 53-29174, by joining the end of the new web and the tip of the old web. After overlapping each other, both webs are cut at the same time and butt-joined.

However, in the former method, in which the web is cut individually, it is difficult to match the mating parts completely, and it is unavoidable that there will be some gaps between the ends of the web, which reduces the strength of the joint. Also, there were drawbacks such as problems in web handling due to adhesive extrusion.

On the other hand, in the latter method, in which the webs are overlapped and cut, the upper and lower webs are cut at the same time using the same cutting blade, so the cut edges of each web can be perfectly aligned, and this state can be maintained while cutting the joining tape, etc. If the joining is performed by the method, it is possible to join the webs in which the abutting portions are perfectly aligned, but on the other hand, there are the following drawbacks.

(1) Since the webs are overlapped and cut, the life of the cutting blade is shorter than when cutting the web individually, resulting in poor cutting edge shape due to reduced blade sharpness.

(2) Since the webs are held one on top of the other, the web surface is easily damaged, and the degree of damage is particularly severe when the web is photographic film or photographic paper that has a flexible photosensitive coating on its surface. .

(3) Since it is necessary to prepare the new web to be joined in close proximity to the old web, the space occupied by the cutting section and the joining section is restricted, and the equipment becomes complex and expensive.

(4) For the same reason as (3) above, maintenance such as replacing the cutting blade and inspecting it is troublesome.

The present invention eliminates the above-mentioned drawbacks of conventional web butt splicing devices, and provides a web splicing device that allows the butt portions to perfectly match and automatically butts and splices webs in a short time with simple operation. The purpose is to provide.

An object of the present invention is to provide a mechanism for preparing and supplying adhesive tape to a suction-type splicing drum, which comprises: a tape pull-out claw that presses the adhesive tape against the splice drum and moves; A preparation and supply mechanism for adhesive tape for bonding, characterized in that each arm swinging about the same axis is provided with a cutting blade that operates to cut the adhesive tape when the adhesive tape returns to its position; A web splicing device that transfers the ends of the web while abutting each other to a splicing part and butts the web with a splicing tape, comprising means for guiding and transporting the web ends, and means for gripping and fixing the guided web ends; A means for cutting the fixed end of the web is arranged along the web travel path in two series on the same movable table at a certain distance, and the movable table is connected to the web. provided so as to be movable alternately by the predetermined distance with respect to a common web running path leading to the section,
A web joining apparatus that alternately switches the web transport system during joining.

achieved by.

The details will be explained below based on preferred embodiments of the present invention.

FIG. 1 shows a schematic front view of a web joining apparatus that is an embodiment of the present invention.

In the figure, 1 is the old web currently being fed, 2 is the new web to be sent next, 3 is a lifting device for switching between the new and old webs, 4 is a movable blade for cutting the web, 5 is a splicing drum, 6 is a tape preparation device, 7 is an adhesive tape for joining the web, 8 is a release paper peeled off from the adhesive tape 7, and 9 is a web winding section.

The old web 1 and the new web 2 are respectively wound into rolls of a predetermined length and mounted on unwinding shafts 10 and 10a. The new web 2 is prepared during the unwinding operation of the old web 1, as will be described later. Rewinding shaft 10, 10a
is provided with a known tension adjusting means (not shown) for applying an appropriately adjusted tension so that the web 1 (or 2) does not slack during unwinding.

The lifting device 3 is driven by a motor 11 and moves up and down along a guide 12 arranged in the vertical direction of the machine frame 22.

The lifting device 3 is provided with a pair of upper and lower web travel guide means. These guide means include fixed rollers 13, 13a, guide rollers 14, 14a, clamp rollers 15, 15a, and guide plates 16, 16.
a. Consists of fixed blades 17, 17a for cutting the web. The clamp rollers 15, 15a are operated vertically by air cylinders (not shown), and clamp the web 1 or 2 in cooperation with the fixed rollers 14, 14a. The guide plates 16, 16a are connected to clamp rollers 15, 15a, respectively, and operate in the vertical direction following the movement of these clamp rollers.

The fixed blades 17, 17a are provided in sliding contact with the movable blade 4.

The movable blade 4 has three opening windows 18 at the top, bottom, and middle of a long rectangular rigid plate, and cutting blades 4a, 4b, and 4c of the same shape are provided at the lower edges of these windows. It is supported by holders 19 from both sides, and its upper end is connected to an air cylinder 21 via a lever 20, as shown in a side view in FIG. The size of the opening window 18 is at least the same as that of webs 1 and 2.
must be able to pass through, and the distance between the three must match the vertical distance between the fixed blades 17, 17a.
The movable blade 4 is guided by the holder 19 and reciprocates in the vertical direction as the air cylinder 21 operates.

The bonding drum 5 is connected to the feed roller 13 (or 1
3a), it is configured to rotate in the direction shown by the arrow in synchronization with the chamber 23, and has a chamber 23 inside thereof that communicates with a vacuum source (not shown), and a chamber 23 on its surface for adsorbing the adhesive tape 7. A plurality of small holes 24 are provided. The tape preparation device 6 includes a tape cutting blade 25 and a tape pull-out claw 26, and is reciprocated within a certain area on the circumference of the splicing drum 5 by a drive means separate from the splicing drum 5. The detailed structure and operation of the tape cutting blade 25 and the tape pull-out claw 26 will become clear from the explanation of the tape preparation operation to be described later.

A clamp roller 37 is provided below the bonding drum 5 and moves up and down via an arm 36 as the air cylinder 35 operates.

The adhesive tape 7 is a known type having an adhesive layer 28 on the upper surface of a support 27 and a release paper 8 on the upper surface, as shown in FIG. After being fed onto the circumference of the bonding drum 5 through the tape, the release roller 30 separates the release paper 8 from the support 27 having the adhesive layer 28, and only the release paper 8 is wound onto the winding shaft 31. It will be done.

Next, the operation of the present web joining apparatus configured as described above will be explained.

Now, as shown in FIG. 1, it is assumed that the old web 1 is being rewound, and a case where a new web 2 is butt-joined to the old web 1 after the old web 1 has been rewound will be described. In this case, the lifting device 3
is in the lowered position as shown.

The new web 2 is prepared to be mounted on the unwinding shaft 10a during the unwinding operation of the old web 1. At this time, the clamp roller 15a and the guide 16a are in the lowered position. After that, the tip of the new web 2 is pulled out from the roll, passed through the feed roller 13a, and then passed through the fixed roller 14a, the clamp roller 15a, and the guide plate 1.
6a to the opening window 18. It is unnecessary to explain that such paper passing work is not limited to manual work but can also be performed automatically.

The new web 2 is transferred to a position where its leading end is somewhat outside the opening window 18. Thereafter, the clamp roller 15a and guide plate 16a are raised to clamp the new web 2 to the fixed roller 14a, and in this way the preparation of the new web 2 is completed.

During this time, the adhesive tape 7 will be used for the next joining operation.
is prepared on the circumference of the bonding drum 5 by the tape preparation 6. This state will be explained with reference to operation diagrams shown in FIGS. 4 to 9.

FIG. 4 shows a state in which the adhesive tape 7 is fed out by a predetermined length required for bonding. The upper end of the adhesive tape 7 separated into release paper 8 by the peeling roller 30 is pressed down by the tape pull-out claw 26, and the lower surface is pressed onto the bonding drum 5 by air sucked through the small holes 24. is adsorbed to.

The tape pull-out pawl 26 is provided so as to swing about a shaft 33 via an arm 32, and this movement is provided by a cam mechanism and a spring member (not shown).

Further, the tape cutting blade 25 is provided at the end of an arm 34 that swings about a shaft 33 by a mechanism similar to that described above. As shown in the figure, the tape pull-out pawl 26 is pushed down by a spring means, while the cutting blade 25 is held at a position away from the drum surface by a cam. While maintaining this state, the splicing drum 5 and the tape preparation device 6 are rotated at a constant speed by separate drive means, respectively, and stopped at a predetermined position shown in FIG. 5. Thereafter, as shown in FIG.
7, and then returned to its original position as shown in FIG. At this time, as shown in FIG. 8, the tape cutting blade 25 descends to cut the adhesive tape 7 into a predetermined length, and as shown in FIG. Prepared above.

Next, the joining operation will be explained.

When web 1 is nearing the end during rewinding,
This is detected by a known winding diameter detector or the like, and based on this signal, the web unwinding speed is gradually reduced until it reaches zero. At this time, the air cylinder 35 is activated and the clamp roller 37 is pushed upward via the arm 36, and at the same time, the clamp roller 15 and the guide plate 16 are raised. As a result, the old web 1 is connected to the splicing drum 5, the clamp roller 37, and the fixed roller 1.
4, a clamp roller 15, and a guide plate 16. At this time, the fixed end of the old web 1 is at least at a position where it does not pass through the opening window 18 (the first
The opening window 18 is set to remain at a position to the right of the opening window 18 in the figure.

After that, the air cylinder 21 is activated, and the movable blade 4
moves up and down. When the movable blade 4 rises, the cutting blade 4
b and the fixed blade 17 cut the end of the old web 1, and at the same time, the cutting blade 4c and the fixed blade 17a cut the tip of the new web 2. Cutting waste is taken out via suction pipes 39a, 39b.

When the web cutting is completed, the motor 11 starts,
The lifting device 3 rises along the guide 12 and is transferred to a predetermined position indicated by the chain line in FIG. When the lifting device 3 stops at a predetermined position, the leading end of the new web 1a that has been cut first coincides with the end of the old web 1, thus completing the matching of the old and new webs.

After that, the clamp roller 15a, the guide plate 16
a is released from the fixed roller 14a, and at the same time the feed roller 13a and the splicing drum 5 rotate in the direction shown by the arrow in FIG. location). At this time, the feed roller 13 and the splicing drum 5 are synchronized with each other and rotate at the same transfer speed, so that the web abutting portions are reliably transferred without shifting. In this case, it goes without saying that a guide plate 38 may be provided along the travel path as shown in FIG. 1, if necessary.

When the web abutting portion reaches the joining position P, the suction action inside the joining drum 5 is released, and the joining drum 5
The adhesive tape 7 prepared on the bonding drum 5
Separated from and affixed to the web. At this time, as described above, the adhesive tape 7 is previously placed in a predetermined position on the bonding drum 5 so that the abutting portion is located at the center thereof.

The predetermined joining is completed when the web abutting portion passes through the joining position P, and then the clamp roller 37 is released from the joining drum 5 and the intended rewinding operation of the new web 1a begins.

While the new web 2 is being unwound, another new web is attached to the unwinding shaft 10, and its leading end is set on the web travel path shown by the chain line in FIG. 1 by the method described above.

By repeating the above operations, the webs are butt-joined continuously.

As detailed above, the present web joining apparatus provides the following effects.

(1) Since the new and old webs are individually cut using separate cutting blades, the life of the blades is extended compared to conventional equipment that overlaps the old and new webs and cuts them with a single cutting blade, and the quality of the blades is reduced due to deterioration in the sharpness of the blades. impact is reduced.

(2) Since there is no need to overlap the webs during cutting, failure of the web surface due to friction between the webs is eliminated.

(3) When preparing a new web to be joined, it can be prepared on a separate running path that is distanced from the running path of the old web that is being rewound, making preparation work and maintenance easier.

The above is a description of one embodiment of the present invention, and therefore, it goes without saying that the present invention is not necessarily limited to the above embodiment.

In the above embodiment, the main body of the apparatus is arranged in a vertical direction, but there is no problem even if the design is changed to a horizontal direction.

Various known joining tapes can be used depending on the type of web or application, and the tape preparation device can be omitted if necessary. In this case, for example, after cutting the splicing tape to a predetermined length, it is possible to manually hold the splicing tape at a predetermined position on the splicing drum.

As detailed above, according to the present invention, a new web can be easily prepared, and the cutting of the old and new webs, the butting of the web ends, and the joining using joining tape are automatically performed in a short time. This makes it possible to streamline the joining work.

[Brief explanation of the drawing]

FIG. 1 is a front view of a device according to an embodiment of the present invention, FIG. 2 is a side view of the web cutting device shown in FIG. 1, and FIG. 3 is an example of a bonding adhesive tape used in the device of the present invention. The cross-sectional views shown in FIGS. 4 to 9 are explanatory diagrams showing a preparation and supply mechanism for a bonding adhesive tape according to the present invention. 1: Old web, 2: New web, 3: Lifting device,
4: Movable blade, 5: Bonding drum, 6: Tape preparation device, 7: Adhesive tape, 8: Release paper, 9: Winding section, 10, 10a: Unwinding shaft.

Claims (1)

[Claims] 1 A mechanism that prepares and supplies adhesive tape to a suction-type bonding drum, including a tape pull-out claw that presses and moves the adhesive tape onto the bond drum, and a mechanism that operates when the pull-out claw returns to the position before movement. A preparation and supply mechanism for adhesive tape for bonding, characterized in that a cutting blade for cutting the adhesive tape is provided on each arm that swings about the same axis as a fulcrum.