JPH062378B2 - Cornerless bag manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to an apparatus for producing a plastic film bag, in particular, a cornerless bag.

<Prior Art> The general manufacturing method of a plastic film bag is 2
The folded plastic film is intermittently transferred by a take-up roller, and the plastic film is side-sealed at a predetermined width in a direction orthogonal to the transfer direction by a heat seal bar or the like, and the width of the side seal is cut by a cutter. The inside is cut and separated. in this case,
The corners at the four corners of the bag have right-angled corners. Due to the sharp corners, there are problems such as punctures of fingertips when the articles are packed in a bag, and other bag bodies are pierced and damaged.

In order to solve such a problem, Japanese Patent Publication No. 59-44263 provides a method for manufacturing a bag body having a shape in which corners are cut.

This product has notches with notches on both edges of the side seal, and if a tangent is drawn to the center of the notch or its vicinity, the slope of this tangent is zero or substantially zero. Then, after making the notch, a hot blade simultaneously melts and cuts the side seal.

In the above method, the fusing separation is positioned within a certain tolerance range in the width direction of the notch so that no cut pieces are left on the lip side, but the notch cutter and the heat blade film transfer. They are arranged at different positions along the direction, and the notches, the side seals, and the fusing are made at the different positions. Therefore, in order to perform positioning of the fusing separation within a certain tolerance range in the width direction of the notch, it is necessary to set the transfer speed of the film and the timing of operating the hot blade, and the width of the bag body is The above-mentioned timing setting work for dealing with various types of bag manufacturing of different sizes is very difficult.

Even if the above timing is set, the fusing and separating position may be outside the certain tolerance range in the width direction of the notch due to the slack or extension of the film when the film is moved by the roller, and the uncut portion is always left uncut. It is not possible to obtain products with no corners, and even if the fusing separation occurs within a certain allowable error range, if the fusing separation point is within the allowable error range, there will be at least some cutting left. There is a problem that the corner angle realizes.

A bag-cutting device for bag-making machines that solves the above problems
-160213 publication. This one is
On the intermittent feed line of the side seal and the laterally sealed bag film, a corner cutter for cutting out both ends of the horizontal seal, and a cutter (shear) for cutting the horizontal seal part at another position past this corner cutter, An optical image sensor for detecting the positional relationship between the cutter and the bag film, and a control device for finely adjusting the cutter to an appropriate position with respect to the bag film by a detection signal of the image sensor.

<Problems to be Solved by the Invention> In the bag cutting device of the bag making machine disclosed in Japanese Patent Publication No. 62-160213, the cutter position for cutting the lateral seal portion is a position separated from the corner cutter position, and the cutter is moved between these positions. As a matter of course, the bag film is displaced from the positional relationship with the cutter.

Therefore, in order to correct this deviation, an optical image sensor for detecting the positional relationship between the cutter and the bag film, and the detection signal of this image sensor are used to move the cutter to an appropriate position with respect to the bag film for fine adjustment. Although the control device is provided, there is a problem in that these optical image sensors and control devices are expensive, the structure is complicated, and maintenance and inspection are troublesome.

<Means for Solving the Problems> The present invention has been made to solve the above-mentioned conventional problems, and its characteristic configuration is that the take-up roller folds in two in an intermittent transition, and the side surfaces are spaced at regular intervals. A movable table is disposed on the transition line of the sealed plastic film so as to be capable of reciprocating in the direction of transition of the plastic film, and a corner cutter is formed on the movable table, the corner edges of the side seals being notched into r-shaped or V-shaped notches. A main cutter that cuts the side seal portion at a ridge line matching point of the notch is provided in parallel with the transition direction of the plastic film,
The corner cutter and the main cutter are provided with the actuator of the movable table for alternately shifting the corner cutter and the main cutter to a fixed position on the same line with respect to the plastic film.

<Operation> According to the present invention, with the above-described structure, notches of r-type or V-type are formed by the corner cutters at both end edges of the side seals in the stopped state of the film which is intermittently moved, and then the movable table is moved to insert the notches. The main cutter is shifted to a fixed position on the same line, and the side cutter is cut by the main cutter at the notch ridge line matching point.

<Example> An example of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a plastic film (hereinafter referred to as a film at the end), and a side seal 2 having a predetermined width B1 and a required width B2 by a well-known side seal device not shown
Has been applied. Reference numeral 3 denotes a planned cutting line to be cut by the main cutter 17 described later. Reference numeral 4 is a notch cut into an r shape by a corner cutter 14 described later. The notches 4 are put in both end edges of the side seal 2. 5 is film 1
Is a feed roller, and 6 is a take-up roller. The film 1 is intermittently transferred by the feed aura 5 and the take-up roller 6. YY 'is a corner cut portion where the notches 4 are inserted in both end edges of the side seal 2 and a cut portion. That is, they are at the same position Y-Y '.
Therefore, the intermittent transfer of the film 1 is performed by the side seal 2
The planned cutting line 3 of the part is intermittently moved so as to stop at the YY 'position.

Reference numeral 7 is a corner cutting and cutting device. The configuration of this device will be described below. First, the corner cutting and cutting device 7 is arranged between the feed roller 5 and the take-up roller 6. 8 is a fixed base installed on the floor. The fixed base 8 is provided with a pair of guide rods 9 along an axis line in the same direction as the moving direction of the film 1, and a movable table 10 is guided by the guide rods 9 so as to be slidable in the axial direction. In addition, a cylinder for a moving table is provided on the front wall of the fixed base 1.
12 is fixed, and its piston rod 13 is connected to the moving base 10. A gate-shaped column 11 capable of passing through the moving film 1 is integrally fixed on the moving table 10.
On this column 11, a corner cutter 14 and a main cutter 17 are arranged in parallel in the moving direction of the film 1 at a constant interval S and are vertically movable. Reference numeral 15 is a lift cylinder for the corner cutter 14, and 18 is a lift cylinder for the main cutter 17.

The main cutter 17 is a single piece having an inclined blade over the entire length in the left-right direction when viewed from the front of FIG. Further, the corner cutters 14 are made up of a pair of left and right parts to cut both end edges of the side seal 2. The pair of left and right corner cutters 14 are not shown in the figure so as to correspond to bags of various widths, but can be moved and adjusted to change the left and right spacing. Further, the corner cutter 14 has a r-shaped (or V-shaped) shape.

On the other hand, a lower blade 16 corresponding to the corner cutter 14 and a lower blade 19 corresponding to the main cutter 17 are installed on the moving table 10. When the corner cutter 14 can be moved and adjusted, the lower blade 16 corresponding to the corner cutter 14 can be similarly moved and adjusted.

Therefore, in the present invention, in the above structure, the film 1 is intermittently moved by the feed roller 5 and the take-up roller 6, and the portion corresponding to the planned cutting line 3 of the side seal 2 is temporarily stopped on the line YY '. Then, first, the corner cutter 14 is moved downward as shown in FIG.
Cut into a shape (or V shape) and insert a notch 4. Cylinder for moving table when the corner cutter 14 is returned to the ascending end
The shift table 10 is shifted rightward in FIG. This shift amount corresponds to a constant interval S between the corner cutter 14 and the main cutter 17. As a result, as shown in FIG. 2, the main cutter 17 and the corresponding lower blade 19
Is located on the YY 'line including the notch 4, and the main cutter 17 is correctly located at the ridge line matching point of the notch 4. Therefore, when the main cutter 17 is moved down and the side seal 2 is cut, the notches 4 on both edges of the side seal 2 are cut off.
The ridge line coincident point, that is, in both the r shape and the V shape, cuts between the coincident vertices of the ridge line, and as shown in A of FIG. Film 1
More separated.

When the main cutter 17 is cut by the main cutter 17 and the main cutter 17 is returned to the rising end, the movable table 10 is moved leftward in FIG. 2 by the predetermined shift amount, and the corner cutter 14 is moved to Y-
Return to Y'line.

Then, the separated bag is sent to the take-up roller 6, and the film 1 is drunk by the feed roller 5 and transferred to the take-up roller 6, and then the side seal 2 to be corner cut and cut YY is cut. It is stopped on the line 'and the same cycle as described above is repeated continuously.

The plastic film also includes a multi-layered paper or aluminum foil coated with a plastic film.

<Effects of the Invention> As described above, according to the present invention, the corner cutter and the main cutter are integrally moved by the same moving table at a predetermined position on the same line cut by the corner cutter at a predetermined interval to form the notch. Since there is no deviation of cutting for accurate positioning at the ridge line coincidence point, and without using an expensive and complicated optical image sensor or control device for deviation correction, it is cheap and simple structure Corner cut and main cut are obtained.

[Brief description of drawings]

The drawings show an embodiment of the method of the present invention, FIG. 1 is a side view in a corner cut state, FIG. 2 is a side view in a main cut state,
FIG. 3 is a view on arrow in FIG. 1 ... Film, 2 ... Side seal, 4 ... Notch, 5 ... Feed roller, 6 ... Take-up roller, 10 ... Moving base, 11 ... Column, 14 ... Corner cutter, 16 ... Lower blade, 17 ... Main cutter,
19 ... lower blade.

Claims (1)

[Claims] 1. A moving base is arranged on a transfer line of a plastic film, which is intermittently transferred by a take-up roller, and which is side-sealed at a constant interval so as to be capable of reciprocating in the transfer direction of the plastic film. A corner cutter having both end edges of the side seal cut out into an r-shaped or V-shaped notch and a main cutter cutting the side seal portion at a ridge line matching point of the notch are provided in parallel with each other in the transfer direction of the plastic film. An apparatus for manufacturing a cornerless bag body, comprising: the actuator of the movable table for alternately shifting the corner cutter and the main cutter to a fixed position on the same line with respect to the plastic film.