JPH0462926B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a device for correcting misalignment of the bonded portion of a strip film in a continuous bag making device such as a bag making machine or a bag making and filling machine, and particularly relates to a forming guide. is characterized in that it is tilted from side to side according to the deviation of the film.

(Prior art) Generally, when forming a bag using a synthetic resin film or non-woven fabric, first, a strip of film is rolled out into a tube shape, and both ends are overlapped, and as the tape is fed out, the bag is rolled up. The overlapped parts are sequentially welded to form a cylindrical body, and when this cylindrical body is let out for a certain length, it is welded in a direction perpendicular to the direction of the cylindrical body, and then the welded line is Then, the tape is fed out, welded, and cut away repeatedly.

As a means for rolling the strip film into a cylindrical shape, a plate material having a width slightly wider than the strip film F and an appropriate length with both edges folded back to form a guide groove 1 is used as shown in Fig. 1. A molded guide 2 is used which is curved gradually inward from the upper edge to the lower edge to form a funnel shape.

That is, the strip-shaped film F wound around the drum 3
is hung between several auxiliary rolls 4 and a guide roll 5, and is further sandwiched between a feeding roll 6, and is fed out by the rotation of this feeding roll 6.
The above-mentioned forming guide 2 is provided between the forming guide 2 and the film F is fed out while slidingly contacting the back surface of the forming guide 2.
It is gradually rolled into a cylindrical shape following the curved shape of the molding guide 2, and finally reaches the lower end of the forming guide 2, and both edges thereof are overlapped.

(Problems to be Solved by the Invention) By the way, in order to form a bag, it is necessary that both edges of the strip-shaped film F rolled into a cylindrical shape are accurately aligned and overlapped, and a misalignment occurs between the two. Not only is the product, the bag, unfavorable in its appearance, but depending on the degree of misalignment, the bonded portion may become poorly bonded, leading to damage and reduced strength.

Therefore, conventionally, methods have been studied to eliminate the misalignment of both edges of the strip-shaped film F at the lower end portion of the forming guide 2. One of the methods is to correct the misalignment by moving the drum 3 left and right, but the distance between the drum 3 and the forming guide 2 is quite large, and several auxiliary rolls must be passed between the drums 3 and the forming guide 2. 4 and guide roll 5, drum 3
Since the response of the deviation to the lateral movement of the drum 3 is slow, it takes a considerable amount of time after the drum 3 is moved laterally until the deviation is corrected. It has the disadvantage of becoming a bag.

Therefore, as a means to eliminate such defects, there is a method in which a pair of pull-back rolls are installed at appropriate positions on the back surface of the forming guide 2, and the strip-shaped film F, which is in sliding contact with the forming guide, is moved from side to side by these rolls. An attempt was made (Jitsugan No. 59-147730). This method is much superior to the previous method described above in that it can quickly correct the misalignment of the strip film F, but it requires a control mechanism that automatically operates the pullback roll, and Film F
There are restrictions on the materials used, making it difficult to apply to extremely flexible and weak materials such as film for teabags. Therefore, there was a desire to develop a misalignment correcting device that could be selected from a variety of film materials and that was easy to operate.

(Means for Solving the Problems) The present invention has been made in order to solve the above-mentioned drawbacks of the conventional art. In a bag making device that rolls the film into a cylindrical shape following the shape, overlaps both edges thereof, and welds the overlapping portions, one end of the forming guide on the center line in the sliding direction of the film strip is pivotally attached to the forming guide. , a support frame to which a molded guide is attached so that the other end can swing around one end;
a screw shaft that is screwed to the other end of the forming guide and is rotatably supported by the support frame, and adjusts the inclination angle of the forming guide with respect to the direction in which the strip film is fed out by rotating forward and backward; It is characterized by

(Function) Since the present invention has the above-described configuration, by rotating the screw shaft in the forward and reverse directions, the forming guide can be swung left and right about the pivot point, and its inclination angle can be adjusted.

When a deviation occurs in the joining portion of both edges of the strip-shaped film, the forming guide is tilted to either the left or right to correct the deviation.

(Examples) Hereinafter, the present invention will be specifically described based on illustrated examples.

FIG. 2 shows an example in which the forming guide shown in FIG. 1 can be tilted left and right. First, a pin 7 is provided at a point on the center line of the forming guide 2 so as to project forward. This is fitted into a mounting hole 9 drilled in a support frame 8 fixed to the body. Then, a female spiral 10 is formed at an appropriate position on the forming guide 2, and is screwed into a male screw shaft 11 mounted substantially horizontally on the support frame 8. That is, by doing this, when the male spiral shaft 11 is rotated in either the forward or reverse direction, the female spiral 10 moves left and right accordingly, so that the forming guide 2 eventually moves left and right around the pin 7. The angle of inclination changes.

Suppose that during bag making or bag making and filling operations, both edges of the strip film F shift as shown in FIG. 5, with the right edge becoming longer. At this time, the male screw shaft 11 is rotated to tilt the forming guide 2 to the left. Then, the lower end of the forming guide 2 moves to the right side 2a, so that the deviation of the band-shaped film F is inevitably eliminated.

(Effects of the Invention) As described in detail above, the present invention forms the forming guide so that it can be tilted left and right, and by changing the inclination angle, it is possible to correct the overlapping portion of the strip film. It has the advantage that it is extremely easy to operate and that the purpose can be achieved reliably regardless of the material and physical properties of the film. Although the figure shows an example in which the male screw shaft 11 is operated manually, the method is not limited to this method. It is also possible to automatically detect the rotational force using a motor and transmit the detection output to the motor to rotate the male screw shaft 11.

[Brief explanation of the drawing]

Figure 1 is a perspective view schematically showing the bag making mechanism;
The figure is an exploded perspective view showing an example in which the forming chute can be tilted from side to side, FIG. 3 is a partially cutaway plan view of the same, FIG. Figure 5 is a front view of the same as above. 1... Guide groove, 2... Forming guide, 3... Drum, 4... Auxiliary roll, 5... Guide roll, 6...
...Feeding roll, 7...Pin, 8...Support frame, 9
...Mounting hole, 10...Female spiral, 11...Male spiral shaft.

Claims (1)

[Scope of Claims] 1. A strip-shaped film is fed out while slidingly in contact with a funnel-shaped forming guide, rolled into a cylindrical shape following the shape of the back surface of the forming guide, and both edges are overlapped, and the overlapping portion is welded. In the bag making apparatus, the forming guide is attached to a support such that one end of the forming guide on the center line in the sliding direction of the strip film is pivotally attached, and the other end is swingable about the one end. a frame, and a screw shaft that is screwed to the other end of the forming guide and is rotatably supported by the support frame, and that adjusts the inclination angle of the forming guide with respect to the direction in which the strip film is fed out by rotating in forward and reverse directions. What is claimed is: 1. A device for correcting misalignment of overlapping portions of film strips in a bag making device, comprising: .