JPH0626866B2 - Transfer control device for automatic bag making machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is to seal a bag-making material in the process of intermittently transferring a long bag-making material, and cut the bag-making material after completion of the sealing. The present invention relates to a bottom-seal type automatic bag-making machine for automatic bag-making, and more particularly to a transfer control device for an automatic bag-making machine that accurately corrects and controls a feed amount when intermittently transferring bag-making material.

(Prior Art) Conventionally, a bottom-seal type automatic bag-making machine detects a mark when intermittently transferring a long-sized bag-making material with a mark or the like, and based on the distance between the marks. The material is intermittently transferred, and when the bag-making material is stopped, the bag-making material is sealed and cut to automatically make the bag.

(Problems to be solved by the invention) The conventional bottom-seal type automatic bag-making machine transfers the bag-making material at a high speed, and therefore does not stop the transfer of the bag-making material at the moment when the mark is detected. It is common to stop at a position separated from the mark detection position by a predetermined distance. However, the stop position of the bag-making material varies due to various conditions, for example, the temperature or the secular change of the feeding mechanism, and the stop error tends to be accumulated. for that reason,
Bag making dimensions may be out of specification.

Therefore, in the present invention, the bag-making material is intermittently transferred, and the set distance from the mark detection position to the stop position when the bag-making material is stopped,
The difference from the actual measured distance during that time is calculated, and the value of the previous mark distance corrected based on the difference is set as the current feed amount to prevent the error of the feed amount from accumulating and to exceed the specified dimension. The technical problem to be solved is to suppress the production of the bag to the minimum.

(Means for Solving the Problem) A technical means for solving the above-mentioned problems is to drive a transfer servomotor and transfer a long bag-making material,
Seals the bag-making material in the process of detecting each mark attached to the bag-making material at a predetermined interval corresponding to the bag-making dimension and intermittently transferring the bag-making material with the feed amount corresponding to the distance between the marks. Then, the transfer control device of the bottom-seal type automatic bag-making machine that automatically makes bags by cutting the bag-making material after completion of sealing detects the rotation of the transfer servomotor and outputs a detection signal corresponding to the rotation. A rotation detector that outputs, a mark sensor that detects the mark in a state where the bag-making material is being transferred, and a mark sensor that outputs the detection signal, and from the time when the detection signal output from the mark sensor is input, Mark distance calculation means for calculating the distance between the marks based on the count value of the detection signal from the rotation detector until the mark detection signal is input, and the mark distance calculation means for storing the calculated distance. Feed correction amount setting means for setting a feed correction amount corresponding to the distance from when the bag is detected to when the bag-making material is stopped, a detection signal from the mark sensor, and a detection signal from the rotation detector. The stop distance calculating means for calculating and measuring the actual distance from the mark to the stop position of the bag-making material based on the above, and the previous mark distance stored in the mark distance calculating means are Mn−
1. If the actual distance from the previous mark detection to the stop time calculated by the stop distance calculation means is ΔFn−1, and the feed correction amount set by the feed correction amount setting means is ΔF0, Fn = Mn−1− (ΔFn−1−ΔF0) is calculated with the current feed amount of the bag material being Fn, and a feed control means for intermittently transferring the bag making material at the calculated feed amount Fn is provided. It is to make a structure.

(Operation) According to the transfer control device of the automatic bag making machine having the above configuration, the previous mark distance stored in the mark distance calculating means is Mn-
1. When the actual distance from the previous mark detection to the stop calculated by the stop distance calculation means is ΔF-1, and the feed correction amount set by the feed correction amount setting means is ΔF0, the feed control is performed. The means calculates the current feed amount Fn of the bag-making material by the following formula, Fn = Mn-1− (ΔFn-1-ΔF0), and intermittently transfers the bag-making material with the calculated feed amount Fn.

Since the feed amount Fn of this time is determined as described above, the stop position of the bag-making material in the previous feed is the feed correction amount ΔF0.
Even if the position is different from the corresponding position, the feed amount can be corrected in the current feed, and thus the feed error is prevented from being accumulated.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a bottom seal type in which a double sheet-shaped bag-making material M in which a cylindrical long synthetic resin film is flatly folded is intermittently transferred in parallel in two rows, and sealed and cut at predetermined intervals. FIG. 3 is a front view of a double-row automatic bag making machine 1 for manufacturing the bag body of FIG.

As shown in FIG. 1, at the upper end of the frame 32, passages 33 through which the two rows of bag-making material M pass in parallel are formed from the rear end to the front end of the frame 32. The tension is adjusted by a pair of left and right feeding mechanisms (not shown), and the tension is fed into the passage 33. Each bag-making material M fed into the passage 33 advances in sliding contact with the upper surface of the conveyor 9 installed in the center of the upper end of the frame 32 so as to be able to circulate, and further moves in the vertical direction to the upper front of the conveyor 9. It is hooked in an inverted V shape on a length adjusting roller 35 which is horizontally mounted so as to be adjustable, advances to the front end of the passage 33, and is forwarded by a carrying-out mechanism (not shown).

A controller 200 having a built-in microcomputer for controlling various operations of the entire automatic bag making machine 1 is installed near the frame 32, and three servo motor drivers 201, 202, 203 are connected to the controller 200.

Above the rear portion of the frame 32, there are first and second mark detection sensors 209 for detecting marks, patterns, etc., which are marked on the bag-making material M at regular intervals in correspondence with the bag length of the bag body to be manufactured. 210 is installed close to the passage 33, and a detection signal is input to the controller 200 every time a mark or the like passes directly under both mark detection sensors 209, 210.

A feed 1 servomotor 91 and a feed 2 servomotor 92, which can be speed-shifted by a command signal from the controller 200, are arranged side by side in the front and rear of the frame 32, and the encoders 20 are respectively provided in the motors 91 and 92.
4,205 are attached. The motor 91 is based on the one-time feed length of the bag-making material M input in advance to the controller 200, the detection signal of the first mark detection sensor 209, and the output signal of the encoder 204.
The gear shift control is performed in accordance with the gear shift command signal output by, and the rotation is intermittently driven. The motor 92 also feeds the bag-making material M once fed into the controller 200 in advance, the detection signal of the second mark detection sensor 210, and the encoder 2.
The shift control is performed according to the shift command signal output from the controller 200 on the basis of the output signal of 05, and the rotation is intermittently driven.

Above the motors 91 and 92, the first feed roll drive shaft 13 and the second feed roll drive shaft 14 are provided with the passage 33.
It is laid horizontally and in parallel along the width direction.

At the upper end of the front part of the frame 32, a pair of upper and lower first feed rolls 6, 6 are rotatably provided above the second feed roll drive shaft 14 and have a length of about 1/2 of the passage. A pair of upper and lower feeding rolls 25 and 25 rotatably placed in front of both the first feed rolls 6 and 6, and a large number of pairs of the first feed rolls 6 and 6 and the feeding rolls 25 and 25. A first feeding mechanism 36 having spring belts 26, 26 is installed for intermittently feeding the first bag-making material M, and a second feeding mechanism having a similar configuration to the side of the first feeding mechanism 36. And the second bag-making material M is provided.
Intermittently.

The output rotation of the motor 91 is transmitted to the first feed roll drive shaft 13 via the pulley and the belt, and the rotation of the first feed roll drive shaft 13 is transmitted to the lower first feed roll 6 via the pulley and the belt. Then, the first feeding mechanism 36 is driven. Similarly, the output rotation of the motor 92 drives the second feeding mechanism.

A seal cut servomotor 93 capable of gear shift control according to a command signal from the controller 200 is installed in the lower rear portion of the frame 32.
6 is attached. A sealing reduction gear 5 having a clutch 214 and a brake 17 is provided on a side of a connecting shaft 41 directly connected to an output shaft of a motor 93 via a coupling 18.
And a blade (cutter device) speed reducer 4 having a brake 16 and a clutch 215 attached to both sides thereof, so that the rotation of the connecting shaft 41 is transmitted to both speed reducers 4 and 5 via pulleys and belts. It has become.

Above the sealing speed reducer 5, a sealing drive shaft 15 through which the output rotation of the sealing speed reducer 5 is transmitted via a sprocket wheel 27 and a chain is rotatably provided horizontally. A sensor operation piece having a protrusion is attached to one end of the sensor so as to face a sensor 211 for detecting an upper end position, which will be described later.

Next, the seal device S will be described. The frame 32
Of the pair of front and rear cam shafts 42, 42, which are rotatably laid laterally near the center of the upper end of the shaft and through which the rotation of the sealing drive shaft 15 is transmitted via a sprocket wheel and a chain. 10 are fitted, and the respective sealing cams 10 are provided with rollers 10a arranged at even eccentric positions.

A pair of right and left laterally long elevating plates 43 are attached to both side surfaces near the center of the upper end of the frame 32 so as to be vertically movable.
Horizontally elongated guide holes, into which the rollers 10a of the sealing cam 10 are fitted, are formed at the front and rear ends of both the elevating plates 43. The rail 43b is horizontally attached, and the lifting plate 43 is synchronously repeatedly moved up and down by the rotation of the sealing drive shaft 15 to repeatedly move the sealing mechanism 23 up and down.

In order to weld the upper and lower films of the bag-making material M linearly along the width direction at predetermined intervals, the sealing mechanism 2 is provided above the vicinity of the central portion of the frame 32 along the width direction of the passage 33.
3, the seal bar holder 5 installed above it
Shafts are formed to project at the left and right ends of 5, respectively,
Both shafts are non-rotatably pressed, and the seal bar holder 55 is jointly connected to both bearings so as to be able to move up and down in response to the repeated up and down movements of the elevating plates 43, and is supported in a cantilevered manner.

Below the seal bar holder 55, a seal bar 8 for heat sealing, which is attached to the lower surface of the seal bar holder 55 via a bracket 56, is installed horizontally along the width direction of the passage 33. The seal 8
a is formed in a sharp shape.

Below the sealing mechanism 23, when the seal bar 8 descends to the sealing position near the bottom dead center, the bag-making material M is nipped between the seal bar 8 and the bag-making material M to escape downward. In order to prevent it, a pedestal 24 is installed horizontally above the upper part of the frame below the upper part of the conveyor 9, and the sealing cam 10 is installed.
Is rotated once from the top dead center, the seal bar holder 55
And the seal bar 8 and the bearings 52 have a top dead center of 1
A part of the bag-making material M descends and rises and the seal bar 8
And a pedestal 24 is sealed.

The seal bar 8 performs an ascending / descending operation of descending from the top dead center to the seal position near the bottom dead center and again rising to the top dead center each time the sealing cam 10 makes one rotation.

Next, the cutter device C will be described. The clutch 215 is directly connected to the output shaft of the blade reducer 4 and is connected to the clutch 215.
The blade cam 11 is fitted on the blade drive shaft 29 that is driven to rotate during excitation.

The blade cam 11 is movably linked to a lower piece 12a of a pair of left and right swing levers 12 that are pivotally supported in front of the blade drive shaft 29 through a connecting rod 63. There is.

A fixed blade 62 is installed at a front end on the frame 32 and slightly in front of the both feeding mechanisms 36, and at the front end of the frame 32, in cooperation with the fixed blade 62, the bag-making material M is cut at predetermined intervals. A movable knife 7 that is opposed to the fixed knife 62 is vertically movable. The upper end of a connecting rod 64 that is connected to the front pieces 12b of the two rocking levers 12 is connected to the left and right ends of the movable knife 7. Then, every time the blade cam 11 rotates, the movable blade 7 moves up and down in synchronization with the mode in which the seal bar 8 moves up and down, and the bag-making material M is cut.

Next, the control device of the automatic bag making machine 1 will be described.

FIG. 2 is a control block diagram of the control device of the automatic bag making machine 1 according to the present invention.

The automatic bag making machine 1 is bag-controlled by a controller 200 equipped with a microcomputer. An operation panel 100 provided with various operation tools (not shown) necessary for bag making operation is electrically connected to the controller 200. Further, servo motor drivers 201, 202, 203 for outputting drive power are connected to the feed 1 servo motor 91, feed 2 servo motor 92, and seal cutting servo motor 93, respectively, and further feed 1 servo motor 91, The encoders 204, 205, 206 for outputting signals corresponding to the respective rotation speeds of the feed 2 servo motor 92 and the seal cutting servo motor 93 are
It is connected to the controller 200.

Further, as a sensor for controlling the automatic bag making machine 1, two rows of bag-making materials M are detected, and material detection sensors 207 and 208 for outputting the detection signals, and two rows of bag-making materials M are printed. Detects marks or patterns,
Mark detection sensors 209, 2 that output the detection signal
10 and a seal device upper end sensor 2 that outputs a position signal when the seal bar 8 of the seal device is located at the upper end.
11 and the fact that the cutter device is located at the upper end,
Cutter device upper end sensor 21 that outputs the detection signal
2 are used, and the respective sensors are electrically connected to the controller 200.

On the other hand, the controller 2 controls the seal device clutch 214, the cutter device clutch 215, and the seal device brake 17 and the cutter device brake 16 so that they are activated by signals output from the controller 200.
00 electrically connected. The sealing device clutch 214 and the brake 17, and the cutter device clutch 2
When the clutch signal is output from the controller 200, the servo motor 93 for seal cutting and the brake motor 15 and the brake 16 are provided.
While the seal device S and the cutter device C are connected to each other, when the clutch signal is cut off, the above respective connections are released and the brake is applied.

Next, the transfer control according to the present invention will be described.

The automatic bag-making machine 1 of this embodiment is configured such that the bag-making material M can be transferred in two rows. However, since both rows have the same transfer control, one row (feed 1 servo) is used. Motor 91
An example of controlling the transfer of the bag-making material M in the column in which the bag-making material M is transferred by

After the bag-making material M is set in the automatic bag-making machine 1 and various setting operations for bag-making are performed on the operation panel 100 connected to the controller 200, the operation panel 100
When an origin return switch (not shown) is pressed, the controller 200 feeds the mark detection sensor 209 until the mark (predetermined pattern) MA printed on the bag-making material M is detected as shown in FIG. The servo motor 91 is driven at a low speed to feed the bag-making material M at a low speed, and a set distance from the time when the mark MA is detected to the stop position of the bag-making material M, that is, a feed (not shown) of the operation panel 100 in advance. The distance equal to the feed correction amount set by the correction amount setting device is fed at a low speed and stopped. The position stopped in this way becomes the origin position of the bag-making material M.

Next, when a start switch (not shown) of the operation panel 100 is pressed, the bag making at the value set by the feed amount setting device (not shown) of the operation panel 100 is performed in the feeding of the first bag making. Send material M. Also, from the second sheet, the fourth sheet
As shown in the figure, the distance between the marks is measured, and the distance for feeding the next bag is calculated using the distance. In addition, in order to measure the distance between marks, the controller 200 starts counting the pulse signals from the encoder 204 when the first signal from the mark detection sensor 209 is input.
When the next signal is input from the mark detection sensor 209, counting of the pulse signal from the encoder 204 is stopped, and the distance between marks is calculated based on the counted number.

As described above, for the bag making from the second sheet, the bag making material M is intermittently transferred based on the distance between the marks, but due to secular change of the feeding mechanism of the automatic bag making machine 1, weather conditions, etc. It does not always stop at the position set by the feed correction amount setting device, and a stop error may occur. Therefore, even if the distance between marks can be measured accurately,
If the actual stop position of the bag-making material M varies, the error of the stop position of the bag-making material M is gradually accumulated. Therefore, it is necessary to correct the feed stop position of the bag-making material M so that it is always moved by the set feed correction amount after the mark MA is detected.

Therefore, as shown in FIG. 5, the controller 200 calculates and measures the inter-mark distance Mn−1 in the previous feeding based on the signal from the mark detection sensor 209 and the signal from the encoder 204, and the previous mark. Distance from detection to stop position of bag-making material M ΔFn-1
Is calculated and calculated, the current feed amount Fn is calculated based on the following equation.

Fn = Mn−1− (ΔFn−1−ΔF0) where ΔF0 is a feed correction amount set in advance by a feed correction amount setting device (not shown) of the operation panel 100.

As shown in the above equation, the controller 200, every time the bag-making material M is intermittently transferred from the previous stop position, the feed correction amount ΔF0 set by the feed-correction-amount setting device and the bag-making material from the previous mark detection. Actual distance ΔFn− to the stop position of M
Calculate the difference from 1. If the actual distance ΔFn−1 is larger than the feed correction amount ΔF0, the value of (ΔFn−1−ΔF0) becomes positive. Therefore, the feed amount Fn is made smaller while the feed correction amount ΔF0 is larger ( ΔFn-1-
Since the value of ΔF0) becomes negative, the bag-making material M is transfer-controlled such that the current feed amount Fn is increased. As a result, even if an error occurs in the stop position of the bag-making material M in the previous feeding, the feed amount is corrected in the current feeding, so the bag-making material M
It is possible to minimize the problem that the error of the stop position is accumulated and a bag having a size different from a predetermined size is manufactured.

In FIG. 5, Fn-1 is the previous feed amount, and Fn-
2 indicates the feed amount before the previous feed, and Mn−2 indicates the inter-mark distance in the feed before the feed.

(Effects of the Invention) As described above, according to the present invention, a bottom-seal type automatic bag-making machine that intermittently transfers bag-making material and makes a bag by sealing and cutting when the bag-making material is stopped. At
If the previous mark distance is Mn-1, the actual distance from the previous mark detection to the stop is ΔFn-1, and the set feed correction amount is ΔF0, the current feed amount Fn of the bag-making material is The bag making material is controlled by the following formula, Fn = Mn-1-([Delta] Fn-1- [Delta] F0), and the bag making material is controlled to be transferred by the calculated feed amount Fn. Even if there is an error in the feed amount, the feed amount can be corrected with this feed, and the accumulation of feed amount errors is prevented.
There is an effect that it is possible to suppress the production of a bag having a size other than the specified size.

[Brief description of drawings]

FIG. 1 is a front view of an automatic bag-making machine, FIG. 2 is a block diagram of a control device for the automatic bag-making machine, and FIGS. 3, 4, and 5 are control explanatory views. 1: Automatic bag making machine 91: Feed 1 servo motor 92: Feed 2 servo motor 100: Operation panel 200: Controller 201: Servo motor driver 202: Servo motor driver 204: Encoder 205: Encoder 209: Mark detection sensor 210: Mark detection Sensor M: Bag making material MA: Mark

Claims (1)

[Claims] 1. A transfer servomotor is driven to detect a mark formed on a bag-making material at a predetermined interval corresponding to a bag-making dimension while a long bag-making material is being transferred. The bottom-seal type automatic manufacturing that automatically seals the bag-making material by sealing the bag-making material in the process of intermittently transferring the bag-making material with a feed amount corresponding to the distance between the marks and cutting the bag-making material after the sealing is completed. A transfer control device for a bag machine, which detects the rotation of the transfer servomotor and outputs a detection signal corresponding to the rotation, and a rotation detector that detects the mark while the bag-making material is being transferred. The mark sensor that outputs the detection signal, and the count value of the detection signal from the rotation detector from when the detection signal output from the mark sensor is input to when the detection signal of the next mark is input The distance between the marks is calculated based on the distance between the marks, and the distance between the marks is calculated, and the feed correction amount corresponding to the distance from when the marks are detected to when the bag-making material is stopped is set. Stopping distance calculating means for calculating and measuring the actual distance from the mark to the stopping position of the bag-making material based on the feed correction amount setting means, the detection signal from the mark sensor and the detection signal from the rotation detector. And the previous distance between marks stored in the distance calculation means between the marks is Mn-1, and the actual distance from the time when the previous mark is detected to the time when the distance is stopped calculated by the stop distance calculation means is ΔFn-1. When the feed correction amount set by the feed correction amount setting means is ΔF0, Fn = Mn−1− (ΔFn−1−ΔF0) is calculated with the current feed amount of the bag-making material as Fn. A transfer control device for an automatic bag-making machine, comprising: a feed control means for intermittently transferring the bag-making material with the above-mentioned feed amount Fn.