JPH05138769A - Bag making machine provided with bag material belt feed controller - Google Patents

Abstract

PURPOSE:To discriminate whether a feeding action is properly carried out by a method wherein every feed dimension by a servo motor under the control of a computer is determined to be shorter than a mark pitch, the remaining amount is fed by driving the servo motor by another power source, and the servo motor can be directly stopped on a detection signal of a mark detection sensor. CONSTITUTION:Upon issuance of a main power source OFF command signal from a computer C, a main power source E1 is turned OFF, and a servo motor 15 is driven only by a sub-power source E2. The running speed is as low as the order of 5-15cm/sec. While a bag material belt F is fed in this state, a mark detection sensor 13 detects a mark. On this detection signal, a switching element 16 is turned OFF, and also the sub-power source E2 is interrupted. Therefore, the servo motor 15 comes to a stop immediately, and also a conveyor 10 and the bag material belt F come to a stop immediately. At this time, the mark on the bag material belt F comes to a position of the mark detection sensor 13. Therefore, an accurate bag material belt feeding can be identified at a glance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a servo motor as a drive source when a bag material band is intermittently conveyed by a pair of sandwich type conveyors, and a program is input in advance for each intermittent drive of the servo motor. The present invention relates to a bag making machine equipped with a bag material band conveyance control device which is controlled and operated by a computer, and in particular, a mark (including a part of a character and a pattern) is displayed at a pitch of one bag on the bag material band. If the mark is detected, the mark is detected, the servo motor is stopped, and the bag material band conforming to the mark pitch is conveyed.

[0002]

2. Description of the Related Art Conventionally, when a bag material strip on which a mark of this kind is displayed is conveyed by a pair of sandwiching type conveyors, in recent years, a servomotor has been used as a drive source to control the operation of the servomotor in advance. It can be seen that the program is input by the computer. In this case, the output signal of the mark detection sensor is once input to the computer, the arithmetic unit in the computer calculates the signal, and the computer outputs a stop signal of the servo motor to stop the signal.

However, there is a limit to the calculation speed, and after the output signal of the mark detection sensor, during the time lag period until the servo motor stops, the bag material band is conveyed by about 3 to 5 mm, and as the conveyance speed becomes faster. , The size transported during this time lag period tends to increase. Therefore, in the actual bag material band, the mark stops just after the position of the mark detection sensor, and it is not possible to immediately determine whether accurate feeding has been done only with this stop position, and normally this mark detection The judgment is made only by the processing result at the processing station located a few stations downstream of the sensor position.

However, the improvement of the processing accuracy applied to the bag material band is not achieved by the actual processing, and if it is possible to determine that the accuracy of the conveying dimension and the position of the bag material is the desired one, it will be a wasteful processing. Since the production rate of non-defective products decreases and industrial waste also decreases, when carrying the bag material belt intermittently,
When the mark on the bag material band stops at the mark detection sensor position, the operator can immediately determine whether or not the conveyance is correct, and thus the development of such a device is desired.

[0005]

Therefore, in order to eliminate the time lag due to the limitation of the computing speed of the computer, the present invention reduces the conveyance size of the servomotor controlled by the computer every time smaller than the mark pitch, and the remaining minute amount. Conveyance of various dimensions conveys the servomotor with a power source separate from computer control, and the servomotor can be stopped directly by the detection signal of the mark detection sensor,
An object of the present invention is to provide to the market a bag making machine equipped with a bag material band conveyance control device in which a mark accurately stops at the position of a mark detection sensor and the quality of conveyance can be discriminated at a glance.

[0006]

In order to achieve the above object, the present invention has a servomotor coupled as a drive source of a pair of sandwich type conveyors for conveying a bag material band, and the intermittent operation of this servomotor. In a bag-making machine controlled and operated by a computer in which a program is input in advance, a mark detection sensor for detecting a mark for each bag length pitch displayed on the bag material band is provided on the upstream side of the conveyor. It is provided in the vicinity of the conveyance path of the bag material band, and the input power of the servo motor is an OR circuit having two main power sources, a main power source controlled by the computer and a sub power source for rotating the servo motor at an extremely low speed. Connected via an element, the sub power supply is turned on by a signal immediately before the main power supply off command signal for each intermittent operation by the computer, To bag making machine equipped with a bag material strip conveyance control apparatus, characterized in that the switching element to turn off it is provided by the detection signal of the mark detection sensor.

In order to achieve the above-mentioned object, the signal immediately before the main power-off command signal for each intermittent operation by the computer of the bag making machine provided with the bag material belt conveyance control device of the present invention is the computer. It is preferable that the auxiliary power-on command signal that is pre-programmed in step 1 and a signal from an encoder that is rotated by a servo motor are one type.

[0008]

The bag material strip on which the mark is displayed is supplied to the pair of sandwich type conveyors of the apparatus, and the intermittent conveyance dimension according to the program is set to be slightly shorter than the supplied bag material strip mark pitch dimension. Next, align one position of the mark with the detection position of the mark detection device, and in the entire length of the transport path from the mark detection sensor to the conveyor,
The entire device is operated with no looseness in the bag material band.

In this way, every time the intermittent driving is started, the main power is turned on according to the program input to the computer, the servomotor starts to rotate, and the conveyor driven by this starts the conveyance of the bag material band. The switch element is turned on by the signal of the sub power supply on immediately before being conveyed by a predetermined size which is slightly shorter than the mark interval, immediately after this the main power supply is turned off according to the program, and then the servo motor is turned on. When the mark reaches the position of the mark detection sensor when the mark is detected by the mark detection sensor, the switch element is turned off by this detection signal, the servo motor stops immediately, and the bag The mark on the material band stops at the position of the mark detection sensor. This operation is repeated thereafter. When the signal for turning off the main power supply is one of the command signal preprogrammed in the computer and the signal from the encoder rotated by the servomotor, the command signal turns off the main power supply.

[0010]

EXAMPLES The present invention will now be specifically described based on typical examples. A is a bag-making machine, which is provided with a pair of sandwich-type conveyors (including rolls) 10 for sequentially unwinding and transporting a bag material band F rolled into a roll, and the bag material band F is usually provided on the upstream side. A welding device 11 which is one of the processing means for heat-sealing in the transverse direction is also provided on the downstream side of the conveyor 10 and a cutter 1 which is one of the processing means for cutting the vicinity of the seal portion F1 formed by the welding by the welding device 11.
2 is provided.

The type of the bag making machine A described above is merely an example, and the present invention is not limited to this. A welding blade of a welding type is provided immediately downstream of the conveyor 10 instead of the processing means. It may be one, or one that is made into individual bags, or one that is discontinuous (usually called perforations)
It may be a bag-making machine for producing continuous bags.

The bag material band F on the upstream side of the conveyor 10
A mark detection sensor 13 is provided on the conveyance path of the device for detecting marks (including characters, patterns, or part of figures) displayed on the bag material belt F at a pitch of one bag, which is usually made of an optical element. It is a thing.

The above-mentioned processing means is connected to a motor 17 which is an ordinary independent power source so as to move up and down every set cycle to process the bag material band F. The number of cycles of these processing means depends on the mark interval of the bag material band F, that is, the length of the bag, but is usually about 60 to 150 cycles per minute. As this processing apparatus, a known apparatus having an arbitrary structure is selected and used.

A drive source of the conveyor 10 is connected to a servo motor 15, and the servo motor 15 is controlled and operated by a computer C in which a program is input in advance.

The program input to the computer includes a voltage correction and a stop instruction signal transmission timing calculation based on the ON instruction signal timing, voltage, and feedback information from the servo motor 15 for each main power supply E1 of the servo motor 15. Program, voltage adjustment of main power supply E1 based on these calculation results, main power supply off instruction signal and transmission timing,
At least an on-instruction signal of the sub power supply and a transmission timing are included. Then, the program is set such that the conveying size of each time by the program is shorter than the mark pitch by, for example, 3 mm to 20 mm. The cycle by the main power source E1 is synchronized with the cycle of the processing means, and is turned on while the processing tool of the processing means is separated from the bag material band F,
The servo motor 15 is operated. The voltage of the sub power source E2 is set so that the servomotor 15 has a low speed, for example, about 5 to 15 cm per second.

The timing of the command signal for turning on the sub power source is set such that it has been conveyed to a size shorter by about 5 to 3 cm than the size of the bag material band conveyed while the main power source E1 is on. Reference numeral 16 is a switch element. The main power source E1 and the sub power source E2 are connected to the servo motor 1 via the OR circuit element 18.
It is connected to 5. Normally, if the size to be conveyed at one time is set from the input section of the computer, the voltage program of the main power supply E1 that is most suitable for this is set, and at the same time the sub power supply on command timing can also be set. Even if there is one, use one whose transfer dimensions can be changed.

The switch element 16 of the auxiliary power source E2 is turned off by the output signal of the mark detection sensor 13. In the figure, the mark detection sensor 1
Although the signal 3 is directly shown to directly turn off the switch element, it is needless to say that there is actually a control circuit that amplifies the signal of the mark detection sensor 13 and outputs an output signal for operating the switch element 19.

Operation of the Embodiment The bag material band F in which the marks are displayed at a predetermined pitch is supplied to the apparatus of this embodiment configured as described above, and the mark detecting sensor 13 is placed at the position of the mark. I'm putting together.

When the apparatus is operated, the welding apparatus 1
The processing means represented by 1 is operated in a predetermined cycle,
During this non-operation, that is, each time the heat-sealing jaw or the cutter 12 separates from the bag material band F, the main power of the servo motor 15 is turned on by the signal from the computer, and the servo motor 15 operates at the speed according to the program. Then, the conveyor 10 connected to this rotates and conveys the bag material band F at a predetermined speed.

The bag material belt F is 3 m from the set size
When conveyed from m to 20 mm, the switch element 16 is turned on by the command signal for turning on the sub power source from the computer C, and the sub power source E2 is coupled to the servo motor 15 via the OR element 18. That is, the main power source E1 and the sub power source E
2 is connected in parallel to the servomotor 15.

Next, a command signal for turning off the main power source is issued from the computer C, the main power source E1 is turned off, the servo motor 15 is driven only by the sub power source E2, and the operation speed is low at about 5 to 15 cm per second. The mark detection sensor 13 detects a mark while the bag material belt F is being conveyed at a high speed in this state, the switch element 16 is turned off by this detection signal, and the sub-power supply E2 is also cut off to thereby cause the servo motor. 15 stops immediately, conveyor 1
0 and the bag material band 15 also immediately stop. Bag material belt F at this time
The mark is the position of the mark detection sensor 13. Thus, the bag material belt F that is stopped is processed by the processing means. This operation is repeated thereafter.

[0022]

According to the present invention, which is constructed and operates as described above, the bag material band is set so that the mark position is aligned with the sensor position at the time of the first setup, and the program is pre-programmed in the computer when the operation is started. The servo motor is mostly driven by the main power supply and the remaining slight drive is driven at a low speed by the separate sub power supply under the condition that the output signal of the mark detection sensor is not input to the computer during this period. Since the signal directly turns off the switch element of the sub power supply, there is no time lag due to the limit of the computing speed of the computer, the servo motor can be stopped immediately, and the mark of the bag material band can be placed at the position of the mark detection sensor. The operator or the measuring machine can confirm at a glance that the bag material belt is accurately conveyed. Therefore, at the time of setup to start the work, only the bag material band needs to be trial-fed, and it is not necessary to perform trial processing as in the past, and if it can be confirmed that the feeding is accurate, the trial-feed bag material band can be returned to the start position. Then, if you start the regular work, the material of the bag material belt for trial feeding will not be wasted at all.

Effects of the Embodiments The effects of the embodiments are of course the same as the effects of the present invention, and after the drive of the servomotor 15 by the main power source E1 is completed, the driving speed by only the sub power source E2 is obtained. However, the bag material belt F is transported at a speed of 5 cm to 15 seconds per second.
Since the speed is extremely low as cm, the servomotor 15, the conveyor 10 and the bag material band F can be immediately stopped by turning off the sub power supply.

Further, since the bag material belt F conveyed by the auxiliary power source E2 has a very small size, it is extremely small in time even at an extremely low speed, and the number of operation cycles of the bag making machine A as a whole. Does not affect.

[Brief description of drawings]

FIG. 1 is a block diagram showing a combined state of components of the present invention.

FIG. 2 is a schematic side view of a bag making machine.

FIG. 3 is a graph showing a state of a transport speed.

[Explanation of symbols]

 A Bag-making machine C Computer E1 Main power supply E2 Sub-power supply F Bag material belt 10 Conveyor 11 Welding device 13 Mark detection sensor 15 Servo motor 16 Switch element 18 Or element

Claims (2)

[Claims] 1. A bag-making machine controlled by a computer to which a servomotor is coupled as a drive source of a pair of sandwich-type conveyors for conveying a bag material band, and an intermittent operation program of this servomotor is previously input. In, the mark detection sensor for detecting the mark for each one bag length pitch displayed on the bag material strip, is provided in the vicinity of the conveyor path of the bag material strip on the upstream side of the conveyor,
The input power source of the servo motor is composed of a main power source controlled by the computer and a sub power source for rotating the servo motor at an extremely low speed, and these two power sources are connected via an OR circuit element. A bag material belt conveyance control device characterized in that a switch element is provided which is turned on by a signal immediately before a main power-off command signal for each intermittent operation by the computer and turned off by a detection signal of the mark detection sensor. Bag making machine. 2. The signal immediately before the main power-off command signal for each intermittent operation by the computer is one of a sub-power-on command signal preprogrammed in the computer and a signal by an encoder rotated by a servomotor. A bag making machine provided with the bag material band conveyance control device according to claim 1.