JPS60244529A - Stacker for plastic bag - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic bag stacking device arranged at the outlet of a plastic bag making machine.

Devices for stacking plastic bags are known, in which the plastic bags are placed on a conveyor belt and the rear part of the bag is hung on a shaft provided at the outlet of a bag-making machine.

This shaft is used in combination with two means for keeping the bag on the shaft and one means for collapsing the back of the bag.

However, in known devices of this type, the shaft supporting the rear part of the bag is a fixed shaft. Therefore, as the bag stack or crystallization progresses, the thickness of this stack will interfere with the bags being delivered from the bag making machine. To prevent this, the shaft must be placed at a sufficiently low position.

Another disadvantage of these devices is that they require that the rear part of the bag be large enough to be hung on a shaft, and therefore cannot be used in short bag making machines.

Furthermore, the level difference between the production delivery surface of the bag making machine and the conveyor belt is large.

Finally, the known device is limited to the thickness of the bag stack due to the need for spacing between the mechanical means.

According to the invention, the shaft supporting the bag rear portion is carried by means that allow the shaft to be lowered relative to the bag delivery means as the stack of bags progresses.

By lowering the support shaft of the bag stack, the device according to the invention is able to maintain the top of the bag stack at the same level or height with respect to the exit surface of the bag making machine, regardless of the thickness of the bag stack.

It is also possible to stack a much larger amount of bags because the bag carrying shaft advances and descends.

According to the device of the present invention, extremely short bags can be stacked;
By increasing the level of the conveyor belt it is possible to shorten the stroke of each bag holding and loading means.

Further characteristics and advantages of the invention will become apparent from the following description based on an example illustrated in the accompanying drawings.

FIG. 1 shows a bag stacking device located at the outlet of a bag making machine. The illustrated bag making machine moves the plastic tube 2 by arrow F
roller 1%la driven in the direction of and tube cutting means 4
A pair of welding jaws 3% 3a and a guide means 5 are provided.

Welding and cutting means are installed in a known manner to produce the bag from the tube 2.

The improved bag stacking device of the present invention is installed subsequent to a bag making machine. The device comprises an endless conveyor belt 6 stretched over drive rollers 7, which conveyor belt carries a stack of bags 8. The rear part 8a of the bag is supported on a rotatable roll 9 mounted between the outlet of the bag making machine and the endless conveyor belt, and the roll 9 (FIGS. 1 and 2) cooperates with a maintenance means 10. do. Means 10 abut against the bag stack 8 and press the bags against the roll 9.

The retaining means 10 is constituted by a roller and is driven by a cam driven by a motor means of the manufacturing machine, as in the prior art, to select either the solid line position or the dotted line position shown in the drawing.

An auxiliary plate 11 is provided between the welding jaw 3.3a and the roll 9. The auxiliary plate 11 extends in the traveling direction of one bag and the direction intersecting therewith, and constantly presses the bag against the roll 9 by the action of a spring 290, as shown by the solid line in FIG.

The auxiliary plate 11 can be moved to a retracted position shown in dotted lines in FIG. At this time, the folding means 12 of the bag rear part 8a can be moved. The means 12 consists of a plurality of wire rods arranged laterally;
When the auxiliary plate 11 is at the dotted line position, the position rI! , 12
to position 12g to perform bag folding.

The auxiliary plate 11 and the folding means 12 are driven as in the prior art by cams driven by motor means of the manufacturing machine.

Both ends of the roll 9 (Figures 1 and 2) have roller bearings 1.
Km is rotatably attached to the shaft 14 via 3. axis 14
is fixed to arm 15.

Although only one arm is shown, these arms are fixed to the shaft 16 via a clasp 17.

Both ends of the shaft 16 are rotatably mounted in bearings 18 fixed to a side plate 19 of the support frame. Only one side plate is shown ◎ At least one cage 2
1 is rotatably mounted on the shaft 16 via a bearing 20. The cage is fixed to one part of the freewheel 22 and another part of the freewheel is fixed to the freewheel 22.
3 and is fixed to the shaft 16. One end of the cage carries a pole plate 24 which cooperates with magnetic damping means 25 fixed to the frame 19 by screws 26.

The gap X provided between the pole plate 24 and the magnetic damping means 25 can be adjusted by means of a bearing 20.

The arm 15 has an extension 15 extending beyond the shaft 16.
Equipped with. One end of the spring 27 is connected to the extension 15a and the other end is fixed to means 28 of the frame of the manufacturing machine. The function of the spring 27 is to return the roll 9 to the raised position.

The device of the invention operates as follows.

Once the bags have been welded and cut and stacked in the stack 8, the retaining means 10 (FIG. 1) is lowered into contact with the stack.

At this time, the auxiliary plate 11 has been moved to the dotted line position, and the folding means 12 folds the bag rear part 8a against the stack 8. The means 12 then rises again and the auxiliary plate 11 returns to the solid line position in FIG. 1 and comes into contact with the bag stack.

When the retaining means 10 is raised again, a length of tube for forming a new bag is guided by the rollers 1.1a onto the bag stack 8. The rear part 8a of the bag formed by cutting and welding is folded by the folding means 12 in the same way as before.

As the stacking of bags progresses and the thickness of the stack increases, roll 9 moves downward and approaches position 9a (FIG. 1). The top bag is therefore always maintained at the same level relative to the exit of the bag making machine.

Movement of the rolls as described above is made possible by the freewheel 22. The freewheel 22 can rotate the arm 15 and the roll 9 downward as shown by the arrow F1, but can completely prevent the arm 15 and the roll 9 from rotating upward in the opposite direction.

During the above movement, the spring 27 is gradually stretched. Therefore, when the stack 8 reaches the desired thickness and actuates the braking means 25 and disengages the braking means from the plates fixed to the cage 21, so that the cage 21 is released, the shaft 16 is moved under the action of the spring 27. can rotate in the opposite direction of arrow F1.

The roll 9 can therefore return to its initial position and receive a new stack of bags.

Of course, the invention is not limited to the specific examples described. It will be apparent to those skilled in the art that various modifications may be made within the scope of the invention.

[Brief explanation of drawings]

FIG. 1 is a side elevational view of the bag stacking apparatus of the invention, and FIG. 2 is a front elevational view of the apparatus showing the brake and freewheel of the carrying shaft of the bag support roll. 1.1a...Roller, 2...Plastic tube, 3.3a...Welding means, 4...Cutting means, 5.
・・Guiding hand &, 6・Conyer belt, 7・Row 2.8・Bag stack, 8a・FB after bag, 9・・
- Roll, 10... Maintenance means, 11... Auxiliary plate, 1
2... Convolution means. Procedural amendment 1. Display of case 1985 patent application No. 6493'9 2
, Title of the invention: Plastic bag stacking device 3, Relationship to the amended case Patent applicant Name: Giorgico Ragan 4, Agent: 1-14 Shinjuku, Shinjuku-ku, Tokyo
Yamada Building 5, date of M'iE order Voluntary 6, number of inventions increased by amendment 7, subject of amendment Drawing 8, content of amendment Official drawings will be supplemented as shown in the attached sheet. (No change in content) Procedure 7m1E May 13, 1985 1, Case indication Patent Application No. 64939 of 1985 2,
Title of the invention: Plastic bag stacking device 3, amendment J
Relationship with Personnel I1 Patent Applicant Name Georges Lagan 4, Agent 1-14 Shinjuku, Shinjuku-ku, Tokyo
Yamada Building (zip code 160) Telephone (03) 354-8
6238, Contents of amendment The claims in Specification B are amended as shown in the attached sheet. 2. Scope of Claims (1) A plastic bag stacking device disposed at the exit of a plastic bag manufacturing machine, comprising a conveyor belt, the plastic bags are stacked on the conveyor belt, and the plastic bags are stacked on the conveyor belt. In an apparatus in which the rear part of the bag is supported on a shaft cooperating with two bag retaining means and one bag rear collapsing means, the shaft supporting the bag rear part is suspended from the shaft according to the stacking of the bags. A plastic bag stacking device characterized in that the plastic bag stacking device is carried by means capable of being gradually lowered relative to the bag delivery means. (21) The bag bearing shaft consists of a roll mounted on one of the ends of two arms, said arm being fixed to a shaft rotatably mounted on the support frame, said shaft A patent characterized in that means for driving the arm stepwise in one direction and means for freely returning it in the other direction by the action of elastic means are provided between the arm and the support. The apparatus according to claim 1. (3) A cage fixed to one part of the freewheel is rotatably mounted on the pivot shaft of the arm, and another part of the freewheel is rotatably mounted to the pivot shaft of the arm. Claim 2, characterized in that the cage is fixed to the shaft, the cage carrying one part of the braking means, and another part of the braking means being fixed to the support frame.
The equipment described in section. (4) The arm has an extension extending beyond the shaft, one end of the spring is fixed to the extension, and the other end of the spring is fixed to the frame. The device according to claim 2. (5) The auxiliary plate and the folding means are operated by a cam driven by motor means of the machine, said cam being synchronous with another cam. 2. A device according to claim 1, characterized in that:

Claims (4)

[Claims] (1) A plastic bag stacking device disposed at the exit of a plastic bag making machine, comprising a conveyor belt, the plastic bags are stacked on the conveyor belt, and the rear part of the bag is stacked between two bags. In a device carried on a shaft cooperating with the retaining means and one bag rear collapsing means, the shaft supporting the bag rear is configured to move the shaft against the bag delivery means in response to bag stacking. Plastic bag stacking device, characterized in that it is carried by means that can be lowered gradually. (2) the bag support shaft is composed of a roll rotatably attached to one of the ends of two arms, and the arm is fixed to a shaft rotatably attached to the support frame; Means for driving the shaft stepwise in one direction and means for freely returning it in the other direction by the action of elastic means are provided between the arm and the support. An apparatus according to claim 1. (3) a cage fixed to one part of the freewheel is rotatably mounted on a rotating shaft of the arm; another part of the freewheel is fixed to the shaft; Claim 2, characterized in that it carries one part of the braking means, and another part of said braking means is fixed to the support frame.
The equipment described in section. (4) The arm has an extension extending beyond the shaft, one end of the spring is fixed to the extension, and the other end of the spring is fixed to the frame. Apparatus according to claim 2.