JPS6334911Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a method for transporting raw fabric in a multi-row bag making machine, in which multiple rows of raw fabric are sandwiched and transferred by a common intermittent transfer device, and the fabric is welded and cut or fused and made into bags at the same time. The present invention relates to a self-adjusting device.

This type of bag making machine, as seen in Utility Model Publication No. 16929 of 1972, for example, allows multiple rows of raw fabric fed by a feeding device consisting of a pair of transfer trochanters to hang down once in a slack section, and then is configured to be pulled up by an intermittent transfer device consisting of a pair of intermittent transfer trochanters. In such a configuration, the intermittent transfer device feeds the original fabric forward by a fixed length by intermittent transfer, but the feeding device operates continuously to obtain a good fabric rewinding effect, and continuously transports the original fabric. It sends it forward. For example, when a feeding device is adopted that alternately starts and stops, at the start of operation (startup), the material is pulled against a heavy roll-shaped object that has stopped rotating. In the case of thin raw material, elongation may occur, which is disadvantageous. For this reason, the feeding device is operated continuously as mentioned above,
In this case, the lower end of the original material hanging between the two devices is
It moves up and down in response to the operation of the intermittent transfer device. Therefore, when the feed rate of the intermittent transfer device is fast, the above-mentioned sagging gradually decreases, and as a result, the web tensioned between the two devices is torn or stretched. To solve this problem, the feeding speed of the feeding device is increased somewhat, but this gradually increases the amount of sagging of the original fabric. Therefore, in the past, a limit switch was used to detect when the amount of drooping exceeded a certain level.
A braking band formed by engaging a braking drum integrated with a support shaft on which the original fabric is mounted in a roll is applied by a cylinder, thereby resisting the unwinding of the original fabric.

According to such a conventional method, the material subjected to resistance is in a state where the material feeding action by the feeding device is stopped, and when the brake is released, the material stretches, etc., resulting in the above-mentioned good material. This is contrary to continuous operation to obtain an anti-rewind effect.
In addition, a common feeding device is used for multiple rows of raw material, and in this case, stretching and wrinkling occur due to the sliding resistance that occurs between the braked material and the feeding device. Furthermore, the sliding resistance has an adverse effect on the continuous operation of the feeding device, making it impossible to smoothly feed other raw materials.

The purpose of this invention is to propose an automatic fabric feeding adjustment device for a multi-row bag making machine that can automatically adjust the amount of sagging within a certain range for each fabric while the feeding device is continuously operated. It is something to do.

In order to achieve this purpose, the automatic fabric feeding adjustment device in the multi-row bag making machine of the present invention is designed to move multiple rows (N rows) of fabric with printing on them at approximately equal intervals using a common intermittent transfer device. It is clamped and transported intermittently at regular intervals, and the arrival of each print is detected before the completion of one transport. When the printing of the most preceding original is detected, braking is applied only to that original, and the last ( In a multi-row bag making machine, the intermittent transfer device is stopped upon detection of the Nth printing, and the transfer of all the original sheets is stopped, and the bag making process is performed. A plurality of feeding devices are provided corresponding to the opposite rows, and these feeding devices are linked to respective variable speed motors, and the feeding devices are normally rotated at high speed to gradually increase the amount of original fabric at the lower end of the feeding device and hang it down. A plurality of detection devices are provided at the sagging portion to detect hanging of each original fabric by a certain amount or more, and a timer is provided to measure time from the time when these detection devices detect the original fabric, and each of the variable speed motors is configured as much as possible. , the speed is switched from high speed to low speed individually in conjunction with the original fabric detection operation of the corresponding detection device, and the speed is switched from low speed to high speed individually in conjunction with the delay operation of the timer.

In such a configuration of the present invention, when each feeding device is rotated at high speed and the feeding amount is made slightly faster, the amount of hanging of each fabric gradually increases, although it is uneven. Then, one or more sheets of the original fabric are detected by the detection device, and based on this detection, an instruction is given to the control section of the corresponding variable speed motor to rotate the variable speed motor at a low speed. As a result, only the corresponding feeding device will move to low speed rotation,
The amount of drooping of the original fabric gradually decreases. The timer starts counting from the time of detection by the detection device, and the variable speed motor is rotated at high speed again after a predetermined period of time. In this way, by rotating the variable speed motor at a high speed, the amount of hanging of the web can be gradually increased, and by rotating the motor at a low speed, it can be gradually decreased, and this action is automatically performed for each row of the web.

Hereinafter, one embodiment of the present invention will be described, taking as an example a case in which two rows of raw fabric are handled. Reference numerals 1A and 1B are belt-shaped original fabrics made of double layers of synthetic resin film, which are held in a pre-wound roll state by an original fabric holding device (not shown). Reference numerals 2A and 2B are feeding devices, which include push conveyors 3A and 3B, each of which has a plurality of guide springs hung at regular intervals around the width of the rollers in order to prevent the original fabrics 1A and 1B from being rolled in, and a similar driving conveyor. 4A and 4B, and is configured to separately hold the original fabrics 1A and 1B rewound from the original fabric holding device, and to prevent thin original fabrics from being entangled due to static electricity. Both drive conveyors 4A and 4B are provided with winding transmission mechanisms 5A and 5, respectively.
It is interlocked with variable speed motors 6A and 6B via B. Reference numeral 7 denotes a guide roll that is well placed in the feeding devices 2A and 2B. 8 is a feeding device 2A,
A guide roll placed below 2B moves the raw fabrics 1A and 1B between the feeding devices 2A and 2B.
Let it hang down. Tension brake devices 9A and 9B are provided opposite the guide roll 8. A wrinkle removing roll 13 is disposed below the guide roll 8. Receivers 14A, 14B are arranged below the hanging portions of the original fabrics 1A, 1B. The receiving trays 14A, 14B are configured such that the lower surfaces of the ends on the side of the feeding devices 2A, 2B are received by a horizontal shaft 15 so as to be able to swing up and down around the horizontal axis, and balance weights 16A, 1
6B is provided so that it is balanced horizontally. Limit switches 17A, 17B are provided below the opposite ends of the saucers 14A, 14B, respectively.
detects when the saucers 14A, 14B move downward. The above 14A, 14B to 17A, 17B constitute detection devices 18A, 18B that detect hanging of the original fabrics 1A, 1B by a certain amount or more. 19
2 is a guide plate on the feeding device 2A, 2B side, 20 is a guide plate on the opposite side, and a width gauge 21 is connected to this guide plate 20.

Reference numeral 22 denotes an intermittent transfer device common to both the original fabrics 1A and 1B, which includes a delivery roll 23 and a presser roll 2 that is urged toward the delivery roll 23 by a spring.
4, and both rolls 23 and 24 sandwich both raw fabrics 1A and 1B. The feed roll 23 is interlocked with a forward/reverse rotating gear 28 that engages with a fan-shaped gear 27 through a unidirectional clutch 25 and an electromagnetic clutch 26 that controls on/off transmission of rotational force, and when the electromagnetic clutch 26 is in an on state. In,
It rotates intermittently in the direction of arrow A in response to only the forward rotation of the forward and reverse rotation gear 28. Further, the delivery roll 23 is provided with an electromagnetic brake 29 that prohibits rotation of the electromagnetic clutch 26 when the electromagnetic clutch 26 is in the OFF state. The fan-shaped gear 27 is connected via a connecting rod 33 to a crank arm 32 protruding from the crankshaft 31 so as to reciprocate once per rotation of the crankshaft 31 driven by a motor 30. 3
4, 35, and 36 are cam bodies provided on the crankshaft 31, and switches 34a, 35a, and 36a detect the states of the cam bodies 34, 35, and 36. The tension brake devices 9A, 9B include rotary solenoids 39A, 39B, and rotor shafts 40 of these rotary solenoids 39A, 39B.
It is composed of brakes 41A and 41B rotatably connected around A and 40B, and the rotor shaft 40
Apply excitation voltage to rotary solenoids 39A and 39B so that A and 40B rotate in the direction of arrow B,
The brakes 41A, 41B act to press the raw fabrics 1A, 1B against the guide roll 8 and limit the transfer amount of each separately. The strength of the braking can be adjusted by controlling the excitation current of the rotary solenoids 39A and 39B, and the brake release state where no excitation voltage is applied is the state of the braking that is applied to the rotor shafts 40A and 40B.
No rotational force is generated, and the brakes 41A, 41B are in contact with the webs 1A, 1B by their own weight, but their strength does not restrict the transfer amount. 42 is a photoelectric detection device that can be moved and adjusted in the length direction of the original fabric;
Consisting of a light emitting part 43 and a light receiving part 44A, 44B, which are arranged across the original fabrics 1A, 1B, the original fabrics 1A, 1B
The light-receiving section 4
The arrival of the register marks 45A, 45B is detected separately by changing the amount of light reaching the register marks 4A, 44B. Reference numeral 46 denotes a welding/cutting section provided below the intermittent transfer device 22, which heat-seals and cuts the original fabrics 1A and 1B at once when the intermittent transfer device 22 is stopped. 48 is a control unit, and the cam switch 34
The operations of tension brakes 37A, 37B, electromagnetic clutch 26, and electromagnetic brake 29 are controlled by a, 35a, 36a and light receiving portions 44A, 44B.

Next, the operation of the control section 48 shown in FIG.
The explanation will be based on 4, 35, and 36. The arrangement of the protrusions on the cam bodies 34, 35, and 36 provided on the crankshaft 31 is as shown in FIGS. Just before the forward/reverse rotating gear 28 starts rotating forward, the cam switch 34a (FIG. 5A) detects the protrusion 34b of the cam body 34, and the R-S flip-flop 49 is set. When the R-S flip-flop 49 is set, the electromagnetic brake 2
9 is turned off, and the electromagnetic clutch 26 is turned on. However, at this point, the reverse rotation of the forward/reverse rotation gear 28 is not transmitted to the delivery roll 23 by the unidirectional clutch 25, and at time _t0 when forward rotation begins, the intermittent transfer device 22 transfers the original fabrics 1A, 1B. Start the transfer. At time t ₁ before time t ₂ when the crankshaft 31 rotates 180 degrees from time t ₀ and the forward/reverse rotation gear 28 switches from normal rotation to reverse rotation, the cam switch 35a [FIG. 5B] is activated by the projection 35b of the cam body 35 is detected, and the signals from the light receiving sections 44A, 44B are stored in the holding circuits 50A, 5.
The switch unit 51 is controlled to input the signal to 0B. 52 is a transfer state determination circuit;
The arrival of register marks 45A and 45B of each of the webs 1A and 1B is detected from the output signals of A and 50B, and for the web whose register mark is detected first, the tension brake device for that web is in a braking state. If the register mark is not found, the brake is brought into a braking state at the register mark detection timing, and the driving of the intermittent transfer device 22 is stopped upon detection of the last (second) register mark. The intermittent transfer device 22 is stopped by turning off the electromagnetic clutch 26 and turning on the electromagnetic brake 29. For example, tension brake devices 9A, 9B
are all in the state of brake release, register mark 4
5A and 45B, first, the output signal of the holding circuit 50A [FIG. 5D] is at time ta.
A signal is generated and the tension brake device [5th
Turn on the brake 41A for the original fabric 1A.
to limit the transfer amount (Fig. 5-1).
Furthermore, register mark 4 which is the furthest behind time tc
5B is detected, the output signal of the holding circuit 50B (FIG. 5E) causes the R-S flip-flop 4 to
Reset 9. Therefore, even though the forward/reverse rotation gear 28 is rotating in the forward direction at time tc, the electromagnetic clutch 26 (FIG. 5) is turned off and the electromagnetic brake 29 is turned on to complete one transfer by the intermittent transfer device 22. do. Here, forward and reverse rotation gear 28
Until time t ₅ when the rotation starts from reverse rotation to forward rotation, bag making processing is performed by the welding/cutting section 46 . Further, at time tc, the deviation of the register marks 45A, 45B that had occurred during the transfer has been somewhat reduced by the braking action of the tension brake device 9A.

Time when the crankshaft 31 rotates 90 degrees from time t ₂
When the cam switch 36a detects the protrusion 36b of the cam body 36 (FIG. 5C) while the transfer is stopped at _t3 , the holding circuit 5 that had been holding the output state until then is activated.
0A and 50B are reset and prepared for the next detection. At time t _{4 before time t 5 when} the forward/reverse rotation gear 28 changes from reverse rotation to forward rotation, the cam switch 34
a sets the R-S flip-flop 49 and prepares for the start of transfer at time _t5 .

When time t ₅ is reached, the tension brake device 9A that was activated in the previous transfer section is still in the braking state, so the transfer is resumed with braking applied to the original fabric 1A and no braking applied to the delayed original fabric 1B. be done. At time _t6 , which is a predetermined time elapsed from the transfer start time _t5 , the switch section 51 is turned on again by the cam switch 35a, and detection of register marks is started. Here, if the tension brake device 9A added an appropriate amount of braking from the previous transfer section, the register mark 45A will be 45.
Detected simultaneously with B. However, if the amount of braking of the original fabric 1A is not appropriate, one register mark 45A is detected before the other register mark 45B. For example, as shown in FIG. 5, the braking amount is close to the appropriate amount and immediately after time _t6 , register marks 45B,
5A, first, at time tb' when the register mark 45B is detected, the transfer state determination circuit 52 determines whether or not the tension brake device 9B is braking. Since the brake is released, the brake 41B is pressed against the original fabric 1B at this timing to regulate the amount of transfer (FIG. 5-). Along with this, the original fabric 1A that was determined to be ahead in the previous time and is in a braking state
The tension brake device 9A is immediately released because they are not the same material, and the brake is released from time tb' until time ta' when the light receiving section 44A detects the register mark 45A. At time ta', the R-S flip-flop 49 is reset to stop the transfer of all the original rolls 1A and 1B. In other words, the leading web 1B is braked to regulate its transfer amount, and the delayed web 1A is transported until time ta' when the register mark 45A is detected, and at time tb' the braking is applied too much. Tension brake device 9 for original fabric 1A
A is released at time tb' and transferred to time ta' to compensate for excessive braking.

In addition, if the register mark 45B still precedes the next transfer section even though braking is applied from time ta, the tension brake device 9A is released even after time ta' when the register mark 45A is detected. The braking state is maintained continuously without being affected.

In this way, the tension brake device that is under braking is not released regardless of the transfer state, but is controlled after determining the transfer state of the material being braked, so that when one transfer is completed, the above-mentioned register is Mark misalignment can be reliably reduced. Furthermore, the tension brake device that is braking will be released in the next register mark detection section when the material that is ahead of the material that is being braked occurs. Even if the elongated state of the original fabric returns to its original state, this does not affect the transfer control, and even if the original fabric to be processed is made of a highly extensible material such as a polyethylene tube, this will not affect the transfer control. Efficient and accurate processing can be performed.

During such intermittent transfer control of the original fabrics 1A, 1B, both feeding devices 2A, 2B rotate at high speed and feed a little faster, so that the original fabric 1
Although the amount of drooping of A and 1B is uneven, it is gradually increasing. Then, one or both of the original fabrics 1A, 1B is received by the receiving trays 14A, 14B, and as the amount of the received material increases, the receiving trays 14A, 14B are moved against the balance weights 16A, 16B.
14B around the horizontal axis 15, for example, the first
The state will be as shown by the virtual line in the diagram. Then, in Figure 6,
The R-S flip-flops 53A, 53B are set when the limit switches 17A, 17B are turned on, the output Q is inverted to logic level "H", and the control section of the variable speed motors 6A, 6B is set to the variable speed. The motors 6A and 6B are instructed to rotate at low speed. Furthermore, the timers 54A and 54B are
When the outputs Q of the -S flip-flops 53A and 53B are inverted to logic level "H", time measurement is started, and after a predetermined period of time, the R-S flip-flops 53A and 53B are automatically reset, and the output Q is returned to the logic level "L", and the variable speed motors 6A, 6B are rotated at high speed again. In this way, by rotating the variable speed motors 6A, 6B at high speed, the amount of hanging of the webs 1A, 1B can be gradually increased, and by rotating them at a low speed, it can be gradually decreased. can be done automatically.

In the embodiment described above, the detection device 18A, 1
8B shows a combination configuration of saucers 14A, 14B, limit switches 17A, 17B, etc.
Various modifications are possible for this, such as a phototube device that detects the amount of drooping. Further, in the embodiment, the original fabric is arranged in two rows, but the same applies even if there are multiple rows of three or more rows.

As described above, according to the present invention, in a multi-row bag making machine in which multiple rows of original fabric are intermittently transferred by a common intermittent transfer device while automatically adjusting the printing deviation, each original fabric is While detecting the amount of sagging separately, each feed device installed corresponding to each of these fabrics can be switched between high speed and low speed, and the amount of feed of these fabrics can be controlled individually. It is possible to automatically and reliably adjust the amount of sagging of each fabric while operating continuously without elongation or slipping resistance.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view, Fig. 2 is a perspective view, Fig. 3 is a block diagram of the transfer control section, Figs. 4A-4H are diagrams of the main parts of Fig. 1, Figs. 5A-5J are waveform diagrams of the main parts of Fig. 3, and Fig. 6 is a block diagram of the feed control section. 1A, 1B... original roll, 2A, 2B... feed device, 3A, 3B... pressing conveyor, 4A, 4B
... Drive conveyor, 6A, 6B ... Variable speed motor, 9A, 9B ... Tension brake device, 1
4A, 14B: tray; 17A, 17B: limit switch; 18A, 18B: detection device; 2
2: intermittent transport device; 42: photoelectric detection device;
45A, 45B: Register mark (printed), 4
8...Control unit, 54A, 54B...Timer.

Claims (1)

[Scope of utility model registration request] Multiple rows (N rows) of original fabric with prints attached at approximately equal intervals are held between a common intermittent transfer device and transferred intermittently at regular intervals, and the arrival of each print is detected before one transfer is completed. As soon as the printing on the most preceding original is detected, the brake is applied only to that original, and the printing is applied to the last (N)
In a multi-row bag making machine, the intermittent transfer device is stopped to stop the transfer of all the original fabrics upon detection of the printing (th), and the transfer of all the original fabrics is performed. A plurality of feeding devices are provided corresponding to the rows, and these feeding devices are linked to respective variable speed motors, and the feeding devices are normally rotated at high speed to gradually increase and hang the original fabric at the lower end of the feeding device. A plurality of detection devices are provided at this sagging portion to detect hanging of each material by a certain amount or more, and a timer is provided to measure time from the time when these detection devices detect the material, and each of the variable speed motors is configured to In a multi-row bag making machine, the speed is changed individually from high speed to low speed in conjunction with the detection operation of the detection device for detecting the sheet material, and the speed is changed individually from low speed to high speed in conjunction with the delay operation of the timer. Automatic feed adjustment device.