JPH0144620B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention intermittently transports a synthetic resin bag material belt by an intermittent transport conveyor, and processes the bag material belt each time the conveyor stops to transfer bags, bag-like articles (book covers, diapers). (including covers), etc., and especially when the two strips of bag material are transported by hanging two strips of bag material using a common pair of clamping type conveyor, it is printed on each strip of bag material. The present invention relates to a bag material belt transfer control device for ensuring that the bag, etc., after having been processed with patterns, characters, trademarks, etc., is positioned at a desired position.

Conventionally, in this type of device, when two strips of bag material are sandwiched and transported in parallel by a common pair of gripping type conveyors (including transfer rollers) in a slippable manner, the left and right bag material strips are connected to the conveyor, respectively. The amount of slippage is slightly different, and even with the same printing machine,
Even if letters, patterns, etc. are printed on bag material strips made of the same material at predetermined pitches, each pitch may not be exactly the same due to the partial elongation or shrinkage of these bag material strips. When two strips of bag material like this are transported using a common pair of clamping type conveyor,
Inevitably, one of the bag material strips is transferred first, and as the intermittent transfer is repeated, the difference accumulates, and if processing is performed to match the printed pattern and letter position on one bag material strip, the difference will be reflected in the other bag material strip. Otherwise, there is a risk that the printed pattern or characters may be separated in the middle, or the processing may become defective or impossible.

Conventionally, as a means of controlling such transfer dimensions, the dimensions for transferring a bag material strip at one time by a conveyor are determined by determining the size of the bag material strip by the pitch of a register mark (including a part of a pattern or letter) displayed on the bag material strip. The conveyor is conveyed for a slightly longer distance, and the mark is detected by each mark detection device, and the conveyor is stopped in response to this signal, thereby shortening the conveyance dimension of the two bag material strips and removing the preceding bag material strip. During the next conveyance period, a brake plate is brought into contact with only the bag material strip to apply a transfer load to the packaging material strip, causing slippage between it and the conveyor, and the preceding bag material strip is removed. is shortened to an appropriate transfer size.

However, as mentioned above, when the pitch of the register marks on two bag material strips is generally shorter on one side and longer on the other, or when the above tendency occurs in a certain part of a roll of bag material strip, Braking is applied continuously to only one side of the bag material band,
This biased operation applies a load only to the bearing at one end of the conveyor, and increases the number of times only one brake is operated, resulting in severe wear and tear on these devices.Also, the brake plate is normally operated by energizing a solenoid. However, if only one side is continuously excited, overheating may occur and there is a risk of burnout.

When the difference in pitch between the register marks of the two bag material strips is large, set the transfer dimension of the conveyor so that a transfer dimension that is longer than the pitch of the longer bag material strip is sent at each intermittent transfer, and Braking must be applied to match this to the short pitch, and with conventional methods and equipment, it is necessary to apply extremely strong braking, making delicate adjustments difficult, and resulting in bags with irregular dimensions as a whole. It will be packed.

Therefore, in this invention, when one of the two bag material strips tends to lead as described above, a transfer load different from that of the other bag material strip is continuously applied to that packaging material strip in advance or during operation. This is to enable the strength of the transfer load to be adjusted depending on the magnitude of the tendency.

This invention has a common conveyor of a clamping type that grips and conveys two strips of bag material parallel to each other in a slippable manner. The two bag material strips are brought into contact with a braking rotary roller in the conveying path so that the two strips of bag material rotate in opposite directions, and the braking rotary roller is driven by a forward/reverse variable speed drive source. This is a bag material band transfer dimension control device in a double-line bag making machine characterized by being connected.

First, an example of a general bag making machine to which the device of the present invention is installed will be explained.

10 is a bag making machine, and 11 is a pair of upper and lower sandwich type conveyors, which sandwich the bag material strips A and B in parallel (see Figure 2) and transport them intermittently, and during this stop period, the above-mentioned The two strips of bag material bands A and B are processed by processing means 13 (welding, welding, fusing, drilling, foil stamping, cutting, etc.).

On the carry-in side of the conveyor 11 mentioned above, a transfer load such as friction plates 16a and 16 is applied to the bag material bands A and B.
When the bag material strips A and B are brought into contact with each other, the bag material strips A and B are conveyed with such a clamping pressure that a slip occurs between them and the conveyor 11.

Each bag material strip A processed by the bag making machine,
Register marks 14a, 14b are displayed at predetermined intervals on B, respectively, and the register marks 14a, 14b are displayed on the bag making machine 10.
Mark detection sensors 15a and 15b that detect 4b
are provided corresponding to the bag material bands A and B, respectively, so that the conveyor 11 is immediately stopped by an input signal from one or both of these mark detection sensors 15a and 15b. It's summery.

In addition, in the illustrated embodiment, during the next transfer period, the friction plate 16a or 16b is brought into contact with the bag material band A or B on the preceding side to apply a transfer load to the bag material band. conveyor 11
This creates a slip between the two and reduces the length of the transport.

In this invention, as described above, during the transfer section D where the two bag material bands A and B are subjected to a slight tension while being transferred by the conveyor 11, the following bag material bands A and B are transported by the conveyor 11. , B is provided.

As the device C for controlling the transfer dimension, a braking rotary roller 17 having an axis parallel to the surfaces of the bag material strips A and B and perpendicular to the transfer direction thereof is mounted on the machine frame 18 of the bag making machine 10. A reversible speed motor 19 is directly connected to this shaft.

Of course, there is no difference even if a constant speed motor is connected in place of the motor 19 with a continuously variable speed forward/reverse switching mechanism interposed therebetween. The diameter of this rotating roller 17 is not particularly limited, but is approximately 8 to 15 cm. A pair of upper and lower guide rollers 20 and 2 are provided immediately on the loading/unloading side of the brake rotary roller 17 to sandwich the two bag material bands A and B from the front and back.
1 is supported on the machine frame 18 in parallel with the braking rotating roller 17. These respective pairs of guide rollers 20 and 21 are very close to each other (2 to 5 mm), but are not in contact with each other. These guide rollers 20 and 21 regulate the positions of the bag material bands A and B.

The guide roller 2 is further provided between the braking rotary roller 17 and the pair of guide rollers 20 and 21.
2 or a guide rod 23, the present invention is the same (see FIGS. 4 to 6).

In other figures, 24a and 24b are web support devices that support the bag material strips A and B wound into rollers, 25 is a pair of clamping type feeding rollers, and 26 is provided just before the device C that controls the transfer size. The guide roller has one end attached to the machine frame 1.
8 or a member fixed thereto is hooked from the carry-in side to the carry-out direction, so that an extremely slight transfer load is applied to the bag material bands A and B. That is, the area from the conveyor 11 to the guide roller 26 is a transfer section D in which the bag material bands A and B are under some tension.

In the bag making machine 10 equipped with the device of the present invention configured as described above, two bag material bands A and B are formed.
To manufacture these individual bags using
These bag material bands A and B wound into rollers are supported on original fabric support devices 24a and 24b, respectively,
The continuous bag material bands A and B are arranged in parallel and passed through a feeding roller 25, and then passed through a guide roller 26.
Passing between a pair of guide rollers 20 in parallel, one of the bag material strips A and B, for example A, is guided above the braking rotation roller 17, and the other bag material strip B is guided below this; Both are passed between a pair of guide rollers 21, and further provided in the bag making machine 10.
8 and 29, and then clamped onto the conveyor 11. Thus, the positions of the register marks 14a and 14b of the two bag material bands A and B are aligned in a straight line in the transverse direction. Further, the cloth 27 is placed over the bag material bands A and B at the guide roller 26 portion.

Then, heat is applied to the processing means 13, for example, a hot knife type fusing welding device, and the mark detection sensor 15 is heated.
a, 15b, register marks 14a, 14b
While detecting this, the two bag material bands A and B are transported by the conveyor 11 while corresponding to their mark pitches, processed by the processing means 13 at each stop, and the bag material bands A and B are processed at each stop. Individual bags are manufactured from B.

In this case, in the apparatus of the present invention, the register mark 14a or 1 of one bag material band A or B is
4b tends to lead, for example, when the register mark 14a of the bag material band A precedes the register mark 14b of the other bag material band B, the circumferential surface of the braking rotary roller 17 is in front of the bag material band A. by the motor 19 in the opposite direction to the transport direction, that is, in the same direction as the transport direction for the bag material band B.
Rotate slowly and maintain the rotation speed.

By rotating the braking rotary roller 17 in the opposite direction to the preceding bag material strip A or B, the frictional resistance or load between the bag material strip A or B and the conveyor 11 is increased. A slip is caused in between to shorten the transport dimension of the bag material band A or B.

In this way, if the two bag material strips A or B continue to be transported, and the bag material strips on the same side show a tendency to advance further, the rotational speed of the motor 19 is further increased.

On the other hand, when the bag material band B or A on the opposite side tends to take the lead, if the braking rotary roller 17 is already rotating in the forward direction, reduce its rotation speed, or or stop it. When the vehicle is stopped, the slow braking roller 17 is reversely reversed to maintain its rotational speed.

It is sufficient if the rotational speed of the above-mentioned braking rotary roller 17 can be switched in 3 to 5 steps for forward and reverse rotation, and when the rotation speed is the fastest, the rotation speed of the brake rotation roller 17 can be changed over the length of one bag by the conveyor 11. It is sufficient that the rotational speed is sufficient to apply a transfer load to the extent that the length can be shortened by about 10 mm compared to other bag material bands A or B.

As described above, in the apparatus of the present invention, the transfer load applied to the two bag material strips A and B is changed by rotating the braking rotary roller 17 in the forward or reverse direction. It is possible to correct the tendency to
This can be sufficiently corrected by further increasing the rotational speed of the braking rotary roller 17 according to the dimensional difference.
By maintaining the rotational speed of the braking rotary roller 17 in accordance with the tendency of deviation in the transfer dimensions of the two bag material bands A and B, it is possible to maintain a state in which the deviation is corrected.

Further, in the apparatus of the present invention, the braking rotary roller 17 and the guide rollers 20, 21 on the loading and unloading side
However, its position does not move, and only the braking rotary roller 17
Since this is simply performed by rotating forward and backward and by changing the rotational speed, the mechanical structure is extremely simple and the braking operation itself is easy. For example, a control device is used that determines whether the signals entering the mark detection sensors 15a and 15b are before or after and measures the time difference between the two, and accordingly issues a command signal to change the rotation speed of the motor 19 in the forward or reverse direction. This further improves the effect of controlling the transfer dimensions of the two bag material bands A and B.

In this invention, the braking rotary roller 17 and the motor 19 are both movable in the direction perpendicular to the surfaces of the bag material bands A and B,
Due to this displacement, it is also possible to use it as a device that rotates the bag material strip on the side receiving greater contact resistance in a direction where the resistance increases.

In addition, the positioning guide rollers 20 and 21 may be one roller at a time as shown in FIG. 7, as long as the bag material bands A and B do not loosen at the portions where they contact the braking rotary roller 17.

[Brief explanation of drawings]

The drawings show typical embodiments of the present invention, in which FIG. 1 is a mechanical side view of the entire bag making machine incorporating the device of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. Figure 3 is a longitudinal sectional front view taken along line 3-3 in Figure 1;
FIG. 4 is a side view showing the principle of the main part of this invention;
FIG. 5 is a side view showing the second embodiment, FIG. 6 is a side view showing the third embodiment, and FIG. 7 is a side view showing another embodiment of the guide roller. Symbols in the figure: 10...Bag making machine, 11...Conveyor, 13...Processing means, 17...Rotating roller for braking, 19...Motor, 20, 21...Guiding roller, A, B...Bag material Band, C...device for controlling transfer dimension, D...transfer path to which some tension is applied.

Claims (1)

[Claims] 1. It has a common conveyor of a clamping type that grips and transfers two strips of bag material in parallel in a slippable manner, and the two strips of bag material transported by this conveyor are slightly tensioned. In the transfer path, the two bag material strips are brought into contact with a braking rotary roller so that the directions of rotation are opposite to each other, and the braking rotary roller is connected to a forward/reverse variable speed drive source. A bag material band transfer size control device in a double-line bag making machine, characterized in that: