JPH03182329A - Folding lip opening device for film bag manufacturing machine - Google Patents

Abstract

PURPOSE:To manufacture a device for opening a lip folded to cut both ends of the folded lip by transferring a film with folded lip to idler rollers supported on the ends of two couples of arm levers and press rollers for pressing a half- folded overlapped section of the film provided on a base of the arm levers while the lip is being opened. CONSTITUTION:Press rollers 94 are installed on a base of two couples of arm levers 11, 11 moving back and forth through a slot 95 in the width direction, and a film (b) with a folded lip (a) is transferred in induction tension from the upper sections of idler rollers 93 of arm levers 91 in the standing state to the lower sections of the idler rollers 93 of arm levers 91 in the almost horizontal state through the lower sections of the press rollers 94 to open the lip (a), while the lip (a) is open in order to open the lip (a) horizontally again. The folded lip, therefore, is guided and transferred from the upper sections of idler rollers 93 of the arm levers 91 directly to the lower side of the idler rollers 93 of the arm levers 91 in the almost horizontal state and transferred in the state of opening the lip (a) again.

Description

[Detailed description of the invention]

[3172 Field of Industrial Application] The present invention relates to a device for opening a folded lip in a film bag making machine for forming bags such as envelopes from plastic film.

[Conventional technology]

A plastic film is folded in half to form a lip on one side, and the lip is cut into approximately ■ shapes at predetermined intervals, and the half-folded film at the ■-shaped cut portions is sealed-cut in the width direction to form a plastic film. Forming a bag from a film is described in Japanese Patent Publication No. 59-44263 and Japanese Patent Application Laid-Open No. 1999-1-
It is known from Publication No. 133725 and the like. [Problem to be solved by the invention] However, it is difficult to use elastic plastic films such as polyethylene (PE), biaxially oriented polypropylene (OPP), or unoriented polypropylene (CPP) by folding them in half or folding their lips. When a bag is manufactured, the elasticity of the film prevents the half-folded part or the folded part of the lip from folding in half or folding reliably, resulting in a bulky bag, which becomes cumbersome to store and transport when assembled into a bundle. For this reason, bags have traditionally been manufactured without folding the lip. In view of these current circumstances, the present invention has been developed to produce a bag that does not become bulky even when the lip is folded using an elastic plastic bag as described above. The object is to provide a lip opening device.

[Means to solve the problem]

In order to achieve the above object, the present invention provides idler rollers that are rotatably supported in the longitudinal direction of the arm rod at the tip of an upright arm rod whose intersecting angle can be freely adjusted and a substantially horizontal arm rod. At the same time, a pressure roller is provided at the base of the arm rod so as to be freely adjustable in the axial direction, and the film is folded in half to form a lip on one side, and the film with the lip folded is placed on the idler roller of the one upright arm rod. The half-folded overlapping portion of the film is guided by a pressing roller at the upper part of the arm, and the lip is opened below the idler roller of the other substantially horizontal arm rod for guidance. The crossing angle of the arm rod is to adjust the distance between the idler rollers depending on the type, thickness, and hardness of the film.1 For example, when the film is hard, the distance between the idler rollers is increased, and when the film is soft, the distance between the idler rollers is adjusted. The lengthwise adjustment of the idler roller using the elongated hole in the arm rod is used to finely adjust the tension of the film in these cases, and the axial adjustment of the pressure roller is used to shorten its tip. It is adjusted to match the fold line of the lip.

[Effect]

The half-folded overlapping part of the film with the folded lip is pressed and transferred into a folded shape by a pressing roller between the idler roller of the upright arm lever and the idler roller of the approximately horizontal arm arm, and the folded lip is folded into an upright shape. It is opened continuously by the transport action of being guided and transferred directly from the idler roller of the arm rod to the lower side of the idler roller of the approximately horizontal arm rod. [Example] To explain the present invention with reference to drawings of an example, a film continuous transport device 2 consisting of a roller 1... is folded in half so as to form a lip a on one side using a known half-folding device (not shown). The film continuous transport device 2 is configured to continuously transport the folded film b, and the film continuous transport device 2 includes a folding line side thermoforming device 3 for heating and melting the folding line C at the base of the lip a, and a folding line side thermoforming device 3 for heating and melting the folding line C at the base of the lip a. a lip folding device 4 consisting of a pressing roller 41 and a folding bar 42 for folding film B from C to a half-folded overlapped portion; and a heating block 52 that presses and heats the half-folded portion of film b and the folded portion of lip a from the surface. A folding forming mold [5] for forming folds by heating, which includes a heating block 54 that presses and heats from both sides, is sequentially provided toward the rear. Therefore, the film b that is supplied to the film continuous transport device 2 after being folded in half to form the lip a is first formed with a fold 11Ac at the base of the lip a by the folding line side thermoforming device 3, and then folded into the lip folding device 4. After that, the half-folded part of the film b and the folded part of the lip are folded by heating in the folding device 5, and then the film b is passed between the pressure rollers 6 and 6. The lower rolls 71, 71, 71, .
The film is transferred to an intermittent film transfer device 8 driven by 1 and converted into an intermittent transfer action. The film intermittent transfer device 9!8 includes a lip opening device 9 of the present invention for reopening the folded lip a, a detection device 10 for detecting the edge of the lip a opened by the lip opening device R9, and the detection device. 10, a cutting device 11 moves in the width direction of the film to cut the lip a into a substantially V shape; a lip folding device 2, which folds the opened lip a again consisting of a twisted bar; Seal cut device fI that welds and cuts the V-shaped cut part of the film in the width direction! t1
3 are provided in sequence. Thus, the lip opening device 9 identifies two pairs of arm rods 91, 91, front and rear, whose intersecting angles can be adjusted, one in an upright position and the other in a substantially horizontal position, and each arm rod 91, 9.
Idler rollers 93, 93 are rotatably supported at the tips of the arms through elongated holes 92, 92, respectively, and at the bases of the two sets of arm rods 91, a pressure roller 94 is supported in the width direction through elongated grooves 95. The film b with the folded lip a is passed from the upper part of the idler roller 93 of the upright arm rod 91 while opening the lip a, and passes through the lower part of the pressing roller 94 to open the lip a to form a substantially horizontal arm. Rod 9
By transferring it under induced tension to the lower part of the idler roller 93 of No. 1, the lip a is horizontally opened again. The crossing angle of the arm rods 91, 91 and the position of the idler rollers 93, 93 relative to the long holes 92, 92 can be adjusted depending on the material, thickness, lip width, etc. of the film, respectively. 15I. Therefore, the film b obtained by folding the lip a, which is intermittently transferred by the intermittent transfer device 8, is transferred to the lip opening device 9. The folded lip passes under the idler roller 93 of the arm rod 91 which is in an upright shape while being folded and guided and transferred to the lower part of the idler roller 93 of the arm rod 91 which is in a substantially horizontal shape. The arm rod 91 is guided and transferred under the idler roller 93, and is transferred again with the lip a open, and the position of the edge thereof is detected by the detection device IO, and the position of the cutting device 11 is detected by the lip a. The cutting device 11 is adjusted so that it is at a predetermined position from the edge of the film b.
The lip a is cut into a substantially V-shape, and then the lip a is folded again by a lip folding device 12 consisting of a twisted guide bar and transported intermittently.
1 and a sealing cutter 132, when the seal cutting device 13 is stopped intermittently, the V-shaped cut portion of the film 6 is welded and cut at the same time to continuously produce bags A with folded bag-shaped lips a. be. Of the two sets of arm rods 91, the degree of upright arm rod is adjusted so as not to put stress on the film depending on the hardness, softness, thickness, etc. of the film, and is adjusted to the same degree as the idler roller 93 with respect to the elongated hole 92. This is further finely adjusted by Fa51ffi5, and the pressure roller 94 is adjusted so that its tip coincides with the folding line C according to the width of the lip a. [Effects of the Invention] The present invention is a film 11 bag manufacturing machine that manufactures bags with folded lips. By pressing the half-folded overlapping part of the film provided at the base, the lip is stretched and transferred to a pressing roller with the lip opened, and the folded lip is smoothly transferred to the half-folded overlapping part of the film using the transfer action. It can be opened easily, and the material such as hardness, softness, thickness, etc. The lip can be opened without straining the film depending on the width of the film or the width of the lip, and the lip can be folded without damaging the film or stretching the film.
It has excellent features that allow for efficient bag manufacturing.

[Brief explanation of drawings]

Fig. 2 is a perspective view of the present invention, Fig. 2 is a plan view of essential parts of the invention, and Fig. 3 is a sectional view taken along the line A--A in Fig. 2. 9...Folding lip opening device, 91...Arm rod. 92...Long hole, 93...Idler roller 94.
... Press roller, 95 ... Long groove, a ... Lip,
b...Film.

Claims (1)

[Claims] 1. An idler roller is rotatably supported in the longitudinal direction of the arm rod at the tip of an upright arm rod whose intersecting angle can be freely adjusted and a substantially horizontal arm rod, and is pressed against the base of the arm rod. A roller is provided that can be freely adjusted in the axial direction, and the film is folded in half to form a lip on one side, and the film with the lip folded is guided by the upper part of the idler roller of the one upright arm, and the film is folded in half. A folding lip opening device for a film manufacturing machine, which is formed so as to press an overlapping part with a pressure roller and further open and guide the lip below an idler roller of the other substantially horizontal arm rod.