JPH0448706B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION -Technical Field- The present invention relates to a web butt splicing device used in various web processing devices.

-Prior art- Generally, in production equipment that uses long strips of paper, synthetic resin sheets, metal foils, etc. (hereinafter collectively referred to as webs), a new It is often necessary to process the web without splicing it. In such cases, conventionally, a web butt joining apparatus as shown in FIGS. 1 and 2 has been used.

That is, this web butt splicing device has a structure disclosed in Japanese Patent Application No. 58-32521 filed by the present applicant, and has a structure in which the preceding web original volume A1 and the subsequent web original volume are
It has a rotating arm 1 that can support B1. As shown in FIG. 2, the leading web A is moved at a constant speed through a running path 5 through guide rollers 3 and 4 arranged along the lower part of a leading web removing machine 2, which will be described later. Further, when the trailing web B is joined to the leading web A, it is pulled out into the running path 5 by the perforated belt 7 of the trailing web puller 6 located below the leading web removing machine 2, and is joined to the leading web A. The speed is controlled to a synchronized speed.

Above and below the running path 5, when joining the web,
A pair of cutting drums 8A, 8B and a pair of joining drums 9A, which are rotated in the directions of the arrows at speeds synchronized with the preceding web A and the following web B, respectively.
9B is located. Each cutting drum 8A, 8B
has cutting blades 8a and 8b, and these cutting blades 8
Leading web A and trailing web B by a and 8b
and are disconnected at the same time. In addition, the joining drum 9A,
9B is provided with tape stands 9a and 9b capable of holding the joining tape T under vacuum pressure, and these joining tapes T are stuck to the upper and lower surfaces of the butt ends of the webs A and B when they pass through. In addition, between the following web drawing machine 6 and the cutting drum 8B and between the cutting drum 8B and the joining drum 9B, there are first and second guide plates 10 arranged along the lower surface of the running path 5,
11 is located.

Since the web butt splicing device described above has the above structure, the preceding web A and the following web B
If joining is carried out with the subsequent web drawing machine 6
The succeeding web B is pulled out from the succeeding web original roll B1 onto the first guide plate 10 by the vacuum pressure of It hangs downward from between the surface 12 and the tip of the second guide plate 11. Thereafter, when the speed of the following web B matches the traveling speed of the preceding web A, the cutting drums 8A, 8B and the joining drums 9A, 9B are rotated, and the cutting drum 8
The leading web A and the trailing web B are simultaneously cut by the cutting blades 8a and 8b of A and 8B, and the rear end of the leading web A is taken up by the leading web removing machine 2.
Therefore, the butt ends of both webs advance toward the joining drums 9A, 9B along the second guide plate 11, and the joining tapes T, T are applied to the upper and lower surfaces to complete the joining. .

In the cutting process using the cutting drums 8A and 8B described above, the cutting drums 8A and 8B are
When in the cutting position shown in the figure, the leading end of the subsequent web B cut by the jet from the compressed air nozzle 13 aligned with the running path 5 is turned over from the cutting drum 8B, and the leading end of the subsequent cut is turned over from the cutting drum 8B.
Since it moves while being attracted to the vacuum suction holes 14 on the circumferential surface of the web B, the leading end of the cut subsequent web B is transferred to the guide plate 11.

However, while there is no problem in the case of a relatively thick web with stiffness, if the web to be joined is thin with weak stiffness, the behavior of the tip b of the cut leading web B becomes very unstable. The vehicle could not be transferred to the guide board 11 because it had turned up in a U” shape.
On the other hand, there were cases in which the fumes from the compressed air nozzle holes 13 stuck to the circumferential surface of the cutting drum B and did not transfer to the guide plate 11 in the same way.

-Object of the Invention- In view of the problems of the conventional web butt splicing devices as described above, the present invention provides a web butt splicing device that does not cause welding errors even when thin webs with weak elasticity are used. The purpose is to

-Structure of the Invention- To summarize the present invention for achieving this object, the trailing end of a leading web moving on a traveling path and the leading end of a trailing web are overlapped and cut by a pair of cutting drums having cutting blades. In a web butt splicing device in which the abutting ends of both webs moved in a butt state are joined by a pair of splicing drums located behind the cutting drum, immediately after the cutting blade of one of the cutting drums. A plurality of trailing web cut end support surfaces are formed on the circumferential surface of the cutting drum, arranged in the length direction of the cutting drum, and a plurality of trailing web cut end support surfaces located between the trailing web cut end support surfaces are formed on the circumferential surface immediately after the cutting blade of the other cutting drum. It is proposed that the cut end of the succeeding web be "stiffened" by protruding a pressing member and sandwiching the cut end of the trailing web between the cutting end support surface of the trailing web and the pressing member. .

-Embodiment- Hereinafter, details of an embodiment of the present invention will be explained with reference to FIGS. 4 to 6.

FIGS. 4 and 5 showing the embodiment of the present invention are sectional views corresponding to FIGS. 2 and 3 described as conventional examples, respectively, and the same structural parts as FIGS. 2 and 3 are The same reference numerals are given.

The present invention is characterized by a plurality of subsequent web cut end support surfaces 15 and a plurality of pressing members 16 provided on the peripheral surfaces immediately after the cutting blades 8a and 8b of both cutting drums 8A and 8B. The cut end b of the following web B is held between the press member 16 and the pressing member 16, and the cut end b is made to have a wavy cross section, thereby "setting up" the cut end b. That is,
As shown in FIG. 6, the compressed air nozzle 13 described above
a plurality of trailing web cut end support surfaces 15 forming a
are provided on the circumferential surface of the cutting drum 8B in a state aligned in the length direction of the drum, and these trailing web cut end support surfaces 15 support the trailing web cut end b.
It is designed to support multiple locations. A plurality of pressing members 16 made of a rigid member are provided on the circumferential surface of the cutting drum 8A at positions corresponding to the rotational direction with respect to the trailing web cut end support surface 15, and are arranged in the same manner as the trailing web cut end support surface 15. The cutting end support surfaces 15 are interposed in pitch between the supporting surfaces 15 of the cutting end of the trailing web. However, the important point in the present invention is that the trailing web cut end b is held between the trailing web cut end support surface 15 and the pressing member 16, so that the shape of the trailing web cut end b has a wave-shaped cross section. Therefore, the present invention is not limited to the configuration of the illustrated embodiment. For example, the trailing web cut end support surface 15 may be provided on the cutting drum 8A, and the pressing member may be provided on the cutting drum 8B, and the pressing member 16 does not necessarily have to be made of a rigid member, but may be made of a sponge or the like placed inside. It may be constructed from an elastically deformable member.

Since the illustrated embodiment has the above structure,
At the time of cutting the web shown in FIG.
The cross section is corrected to a wavy shape as shown in the figure. Therefore, the cut end b is in a so-called "stiffened" state, and has the same effect as if it were given rigidity that would not bend due to the action of some external force. This clamping action by the trailing web cut end support surface 15 and the pressing member 16 continues until the cutting drums 8A, 8B rotate from the cutting position and the cut end b of the trailing web B is transferred onto the guide plate 11. Even if the web is thin, it will surely rest on the guide plate 11 and be joined with the joining tape T.

-Effects of the Invention- In the end, according to the present invention, even thin webs with no stiffness can be reliably joined by a simple configuration in which a plurality of subsequent web support surfaces and a pressing member are provided immediately after the cutting blade of the cutting drum. There is.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a conventional web butt splicing device, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a sectional view of the main part of the web butt splicing device in a cut state, and Fig. 4 and FIG. 5 are sectional views corresponding to FIGS. 2 and 3 showing a web butt-joining device according to the present invention, and FIG. 6 is an enlarged sectional view of essential parts of the same web butt-joining device taken along the line - in FIG. 5. . 8A, 8B... Cutting drum, 9A, 9B... Joining drum, 15... Trailing web cut end support surface, 1
6... Pressing member, b... Cut end, A, B... Web.

Claims (1)

[Claims] 1. The rear end of the leading web moving on the running path and the front end of the trailing web are overlapped and cut by a pair of cutting drums having cutting blades, and the abutting ends of both webs being moved in a butt state are cut by the cutting drums. In a web butt splicing device that splices webs using a pair of splicing drums located behind a pair of splicing drums, a plurality of subsequent web cuts aligned in the length direction of the cutting drum are arranged on the peripheral surface immediately after the cutting blade of one of the cutting drums. A plurality of pressing members are formed on the peripheral surface immediately after the cutting blade of the other cutting drum and are located between the trailing web cut end supporting surface, and the pressing members are positioned between the trailing web cut end supporting surface and the pressing members. A web butt splicing device characterized in that the cut end of the succeeding web is "stiffened" by sandwiching the cut end between the two webs.