JPH0692140B2 - Bag making equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bag-making apparatus that sequentially heat-welds and cuts end portions of a thermoplastic resin film formed into a cylindrical shape to manufacture a bag body, particularly from a CPU. The present invention relates to a bag-making apparatus in which the number of bag-makings per a predetermined time, the length of a bag body is set / changed, and the temperature for heat-sealing a film is set / changed.

[Background of the Invention]

FIG. 11 shows a main part of a conventional bag making apparatus. This bag-making apparatus is basically the same as that disclosed in, for example, Japanese Patent Laid-Open No. 59-162034.

Reference numeral 1 in the drawing is a welding cutting mechanism. In this welding cutting mechanism 1, the welding cutting base 3 is installed on the fixed side base 2,
A welding cutting base 5 is held on a movable base 4 opposite to this. An arcuate heating portion is provided on both or one of the facing surfaces of the two welding cutting bases 3 and 5. Further, one welding cutting base 5 is provided with a cutter 6 having a shape along the arc-shaped heating portion. The thermoplastic resin film F is formed into a cylindrical shape. This film F is sent by a roller in a flat state. Then, the film F is intermittently fed by the film supply roller 7 to the middle of the welding bases 3 and 5 facing each other. The rod 8 is driven in synchronization with the intermittent supply of the film F,
The movable base 4 moves toward the fixed base 2, and the welding cutting bases 3 and 5 facing each other are pressed against each other with the film F sandwiched therebetween. By this pressing operation, the film is heat-welded by the heating portion provided on both or one of the welding cutting bases 3 and 5, and the welding seal line A is formed at the lower end of the film F as shown in FIG. In the welding operation of the welding cutting bases 3 and 5, the film is cut by the cutter 6 prior to the heating and welding operation. Since the welding cutting bases 3 and 5 repeat the pressing operation intermittently, the film F is cut from the cutting line B by the cutter 6 after the welding seal line A is formed and fed for a predetermined length. By this operation, the film bag body shown in FIG. 12 is continuously manufactured.

[Problems to be solved by the invention]

In the above bag making apparatus, the intermittent feeding operation by the film supply roller 7 and the pressure welding operation of the welding cutting base 5 on the movable side are synchronized by a mechanical means, and the welding cutting bases 3 and 5 are also operated. The heater temperature for the heating units provided in both or one of the two is artificially set.

As a specific example of a mechanism for driving the welding cutting bases 3 and 5 and the film supply roller 7, the film supply roller 7 is first driven by a crank mechanism, a one-way clutch, or the like. The rod 8 connected to the movable base 4 is driven by a cam or the like. The heater temperature of the welding and cutting base is set by means different from the setting conditions of the above mechanism, corresponding to the setting of bag making conditions by the above mechanism.

Therefore, in this conventional example, the setup work when changing the manufacturing conditions of the bag body, that is, the setting of the number of bag makings per time and the length of the manufactured bag body, and the setting of the film welding temperature are complicated, There is a drawback that the work becomes inefficient. That is, for example, when changing the length 1 (see FIG. 12) of the bag to be manufactured, it is necessary to change the feed length of the film F between the welding cutting bases 3 and 5 during the pause of the pressure welding operation. In order to change the feed length of the film F, it is necessary to change the rotation angle of the film supply roller 7 that rotates during the pause of the pressure welding operation of the welding and cutting base 5. In a mechanism in which the film supply roller 7 is driven by a crank mechanism and a one-way clutch as in the prior art, when changing the rotation angle of the film supply roller 7 once, it is necessary to change the operation radius of the crank. is necessary. This work is performed by changing the connection point between the crank arm and the link, but the changing work is very complicated. The number of bags manufactured per time can be set by changing the drive rotation speed of the main motor that drives the welding cutting base 5 and the drive mechanism of the film supply roller 7. In this case, the film welding temperature The setting must be made by artificial experience and intuition according to the bag making operation cycle. Therefore, the temperature setting condition must be set by a skilled worker, which is inferior in workability.

Furthermore, when a pattern etc. is printed on the film F,
It is necessary to match the printing position with the welding seal line A and the cutting position, but it is very difficult to perform this positioning by changing the operating radius of the crank. In addition, the bag that is continuously manufactured,
When a pattern shift occurs during the continuous manufacturing, it is necessary to correct the rotation angle of the film supply roller 7 during the process. In this case, it is necessary to stop the apparatus once and set the rotation angle of the film supply roller 7 again.

The present invention is to solve the above-mentioned conventional problems, and to manufacture a bag-making apparatus capable of easily changing the length of a bag to be manufactured and setting the number of bag-makings per unit time. It is an object.

[Means for solving problems]

The bag making apparatus according to the present invention is a pair of welding cutting members, which are arranged to face each other and have a welding portion for welding bag material and a cutting mechanism for cutting the bag material, and convert rotational power into reciprocating motion. The welding cutting member includes a drive mechanism that presses and separates the welding cutting members from each other, and a speed changing unit that receives rotational power obtained from the same drive source as the driving mechanism and obtains a speed change rotation output. Pulse generation means for producing a pulse train having a pulse speed change corresponding to a speed change of the speed change rotation output, a speed change rotation output accelerating when the welding cutting members are separated from each other are obtained when the welding cutting members are pressed against each other. A frequency conversion means for changing the number of pulses of the pulse train per predetermined time, a motor whose rotation speed is controlled by a pulse example obtained by the frequency conversion means, and this motor And a roller that supplies a bag material between the welding and cutting members, and the rate of change in the number of pulses in the frequency conversion means can be changed according to the length of the bag body to be manufactured. It is a thing.

[Action]

In the above means, the rotational power is converted into a reciprocating motion so that the pair of welding cutting members come into pressure contact with each other and separate from each other, and at the time of this pressure operation, the bag material such as a film is welded at the welding portion and cut by the cutting mechanism. To be done. Rotational power from a drive source common to the drive mechanism for moving the welding cutting member is applied to the converting means, and the speed changing means obtains a variable speed rotation output synchronized with the operation of the welding cutting member. This variable speed rotation output is a deceleration output that decreases the rotation speed when the pair of welding cutting members are in pressure contact, and an acceleration output that increases the rotation speed when the welding cutting members separate from each other. Are repeated in synchronism with the pressing and separating operations of the welding and cutting member. The pulse generating means generates a pulse train having a pulse interval change corresponding to the speed change of the variable speed rotation output, and the number of pulses per predetermined time in this pulse train is changed by the frequency converting means. The rotation speed of the roller that supplies the bag material between the welding and cutting members is controlled by the pulse train obtained by the frequency changing means. Therefore, the bag material is fed between the welding and cutting members at an increased feed rate when the welding and cutting members are separated from each other, and the feeding speed of the bag material is reduced when the welding and cutting members are pressed against each other.

Here, when changing the length dimension of the bag to be manufactured, the rate of change in the number of pulses in the frequency conversion means may be changed. As a result, only the feed length dimension of the bag material between the welding and cutting members is changed without changing the synchronous relationship between the operation of pressing and separating the welding and cutting member and the supply speed of the bag material. Further, when changing the number of bags manufactured per predetermined time, only the rotation speed of the rotational power from the drive source per predetermined time may be changed. In this way, the bag manufacturing conditions can be set only by electrical control, and the setup work when changing the manufacturing conditions can be simplified.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a front view showing the overall structure of a bag making apparatus according to the present invention, and FIG. 2 is a perspective view showing a welding cutting mechanism and a drive unit of a film supply roller in the bag making apparatus shown in FIG.
Fig. 3 shows the mechanism for pulling out the film from the original fabric and CCD.
FIG. 4 is a perspective view showing the detector, and FIG. 4 is a second view showing the pulse generator.
5 is a block diagram of the motor control device.

As shown in Fig. 1, this bag-making machine has three motors M
a, Mb, Mc are provided. Ma is a main motor for driving a welding cutting base as a welding cutting member described later and for driving a pulse generator. In this embodiment, the film F is used as the bag material. Mb is a motor for pulling out the film F from the original 10. Mc is for driving the film supply roller to intermittently feed the film between the welding and cutting bases, and is controlled by the pulse generated from the pulse generator.

The motor Mb is arranged on the upper right side of the gantry 11 in the figure.
As shown in FIG. 3, the motor Mb is a film drawing roller.
Driving twelve. The power of the motor Mb is, for example, gears 13 and 14
And is transmitted to the film pull-out roller 12. The film F wound on the original 10 is the film pull-out roller 12
Is pulled out by and is fed into the holding portion G provided on the right side of the gantry 11 in a hanging state. Sensors 15a and 15b, which are vertically arranged at intervals, are provided in the holding section G. The motor Mb is controlled according to the detection outputs of the pair of sensors 15a, 15b, and the amount of film pulled out from the material 10 is adjusted so that the lower end of the slack portion of the film F can be maintained between the sensors 15a and 15b. It Also, the motor Mb is controlled in relation to the amount of film consumed in manufacturing the bag per unit time, so that when the film processing speed becomes faster, the motor Mb is accelerated so that the film drawing speed becomes faster. Is set.

The film F that has passed through the holding section G is guided by the guide rollers 16, 17, 18
It passes over and is sent forward. As shown in FIG. 3, the film F located between the pair of guide rollers 17 and 18
A CCD camera 19 is arranged above. This CCD camera 19 is for measuring the feed amount error of the film F by observing the position of the pattern H of the film F which is intermittently fed and stopped when the film F has a target pattern H. is there. The correction of the error of the feed amount will be described later.

As shown in FIG. 1, the film F is guided on a roller group 20 arranged in a predetermined number and fed to the upper left portion of the gantry 11.
The motor Mc provided in the upper left portion of the gantry 11 directly drives the film supply roller 21 (see FIG. 2). This motor Mc is a servomotor (AC motor or DC motor) with a pulse generator. The rotation speed and rotation angle of this motor Mc are set by pulse control by a control device described later. The film supply roller 21 is intermittently driven by this motor Mc, whereby the film F
Are sent to the intermittent part by the set length.

Reference numeral 30 is a welding cutting mechanism. As shown in FIG. 2, in this welding cutting mechanism 30, a welding cutting base (welding cutting member) 32 is fixed to a fixed base 31 fixed to the gantry 11. Further, a welding cutting base (welding cutting member) 34 is provided on a movable side base 33 provided so as to face the fixed side base 31. A heating portion having a substantially arc shape is provided on the facing surface of both or both of the welding cutting bases 32 and 34. This heating part functions as a welding part for the film F which is a bag material, and in this embodiment, the film is heat-welded by the heating part (see symbol A in FIG. 12). The temperature of the heating unit can be changed by changing the heating condition by the heater, and the setting of the heating condition for the heater is performed by a command from the CPU described later. The judgment condition of the command from the CPU is mainly determined in accordance with the number of bag makings per hour (the operation cycle of the welding cutting base 34 on the movable side; the number of operation shots of the welding cutting base 34 per minute). .

A cutter 35 is provided on the movable welding cutting base 34, and a receiving blade is provided on the stationary welding cutting base 32. The movable base 33 is driven in the (a)-(b) directions. When it is driven in the (a) direction, it first meshes with the cutter 35 receiving blade, and subsequently, the movable welding base. 34 is pressed against the welding cutting base 332 on the fixed side. A shaft 36 is fixed to the fixed-side base 31, and the movable-side base 33 moves to (a)-(b) by sliding the shaft 36.

The movable base 33 is driven in the directions (a)-(b) by the power of the main motor Ma. A plurality of drive rods 37 are connected to both sides of the movable side base 33, and the other end of each of the drive rods 37 is connected to a rotary link 38. The rotation link 38 to which each drive lot 37 is connected is rotatably supported by a pair of support shafts 41 and 42 arranged vertically. The power of the main motor Ma provided in the frame 11 is driven by the drive pulley 45 and the toothed belt 46.
And is transmitted to the main drive shaft 48 by the driven pulley 47. A drive pulley 49 is provided on the main drive shaft 48. Reference numeral 53 is a cam shaft. A driven pulley 52 is provided on the cam shaft 53, and a toothed belt 51 is wound around the driven pulley 52 and the drive pulley 49. A pair of cams 54 are fixed to the cam shaft 53. A follower 61, which is in sliding contact with the cam 54, is provided at one end of the swing link 62. The swing link 62 is a support member
It is rotatably supported by 63. A drive link 64 is connected to the other end of the swing link 62. The rotating links 36 arranged above and below are connecting links.
The drive link 64 is connected to the lower end of the connection link 65. The rotational force of the main drive shaft 48 driven by the main motor Ma is transmitted to the cam shaft 53 by the toothed belt 51. When the cam 54 is driven together with the cam shaft 53, the swing link 62 is swing-driven according to the shape of the cam. This swinging motion drives the drive link 64 up and down, and further drives the drive rod 37 in the horizontal direction via the rotary link 38.
As a result, the movable base 33 is driven in the (a)-(b) directions, and the welding cutting base 34 is fixed to the welding cutting base.
The pressure contact / separation operation is repeated for 32. The main motor Ma is a servo motor, and its speed can be changed as necessary.

Another drive pulley on the main drive shaft 48
71 are provided. The power of the drive pulley 71 is transmitted to the driven pulley 73 by the toothed belt 72. The driven pulley 73 is fixed to the input shaft 75 of the transmission box 74, as shown in FIG. A gear 77 is fixed to the output shaft 76 of the transmission box 74. The power of the gear 77 is increased by the speed increasing gear group 78 and transmitted to the driven gear 79. The driven gear 79 is fixed to the input shaft 82 of the pulse generator (encoder) 81.

The speed change box 74 has a cam mechanism inside. In this speed change box 74, when the input shaft 75 is continuously rotated according to the rotation of the main drive shaft 48, the output shaft 76
Is set so as to output the rotation as shown in the diagram of FIG. The welding cutting mechanism 30 is driven by the rotation of the main drive shaft 48. However, in the transmission box 74, the welding cutting mechanism 30 operates in synchronization with the operation of the welding cutting mechanism 30.
The force shaft 75 makes one rotation in each cycle, and the output shaft 76 rotates in one cycle of variable speed rotation as shown in FIG. This variable speed rotation output serves as a reference for the rotation operation of the film supply roller 21. The rotation output shown in FIG. 6 is gradually accelerated (range α) immediately after the movable welding cutting base 34 is separated from the fixed welding cutting base 32, and then reaches a constant speed (range β). Further deceleration (range of γ)
Pause. The welding cutting mechanism 30 is set to perform the welding cutting operation while the rotation output is stopped. The rotation output shown in FIG. 6 is similar to or similar to the rotation power of the film supply roller 21 driven by the conventional crank mechanism. The pulse generator 81 shown in FIG. 4 comprises, for example, a disk that is rotationally driven by the input shaft 82, and optical detection means that detects the detection units provided at equal pitches along the circumference of the disk. Is. Alternatively, it is possible to form the pulse by magnetic means. The rotation shown in FIG. 6 is output from the output shaft 76 of the speed change box 74, but the rotation increased by the speed increasing gear group 78 is input to the pulse generator 81, so that the pulse generator 81 outputs the rotation. A pulse corresponding to the rotation output in FIG. 6 is generated. Figure 7 shows the pulse generator
The pulse generated from 81 is shown schematically.
When the rotation output from the speed change box 74 is accelerated (in the range of α), the pulse generation frequency gradually increases and the output rotation from the output shaft 76 reaches a constant speed (in the range of β). Then the frequency becomes constant. Further, when the rotation speed of the output shaft 76 is reduced (range of γ), the frequency gradually decreases. And, of course, no pulse is emitted when the rotation output is at rest. The servomotor Mc with a pulse generator, which serves as a drive source for the film supply roller 21, is drive-controlled based on the pulses shown in FIG. That is, the servomotor Mc is the welding cutting mechanism 30.
In the state of being synchronized with, the rotation output similar to the rotation output shown in FIG. 6 is exerted.

FIG. 5 is a block diagram showing a control device of the servomotor Mc with pulse generator.

Reference numeral 91 in FIG. 5 is a frequency converter.
The frequency converter 91 thins out and divides the setting pulse VII generated by the pulse generator 81. The thinning rate and the frequency division rate are performed based on the frequency conversion rate instruction from the CPU 92. FIG. 8 schematically shows the pulse that has passed through the frequency converter 91. Pulse generator
The setting pulse VII issued from 81 (see FIG. 7) is CPU92.
When thinned and divided by the instruction from
As shown in the figure, the number of pulses generated in one cycle is reduced. However, the pulse frequency distribution is similar to the setting pulse VII shown in FIG. Servo motor Mc is 1
Since the step rotation angle per pulse is constant, when the servo motor Mc is controlled by the pulse which is thinned and divided as shown in FIG.
The rotation angle per cycle is reduced by the number of decimated and divided pulses. However, the speed distribution such as acceleration and deceleration is similar to the rotation output diagram shown in FIG.

In FIG. 5, the pulse frequency-converted by the frequency converter 91 is the frequency / voltage converter (F / V converter) 93.
And is converted into a voltage corresponding to the pulse frequency. This voltage is supplied to the servo motor Mc through the voltage amplifier 94, and the servo motor Mc is driven at a speed corresponding to the pulse frequency. At the same time, the pulse that has passed through the frequency converter 91 is sent to the voltage amplifier 94 through the counter 95 and the digital / analog converter (A / D converter) 96. The servo motor Mc is provided with a pulse generator 97 and outputs a pulse having a frequency corresponding to the rotation angle of the motor. In the control device, the drive pulse and pulse generator shown in FIG.
The number of pulses output from 97 is compared, and the motor rotates by an angle corresponding to the number of pulses shown in FIG.

Next, the operation of the bag manufacturing apparatus according to the above embodiment will be described.

In this bag manufacturing apparatus, the main motor Ma is driven at the set rotation speed. The setting of the rotation speed of this main motor Ma is
Number of bags made per hour (welding and cutting base 34 per minute)
The number of operation shots) is input by a command from the CPU. And the welding temperature condition is
It is set according to the input of the number of bag makings per time.
Specifically, a temperature setting condition corresponding to the number of bag makings per hour is stored in the RAM or the like. For example, if the number of bag making shots per minute is 120, the temperature of the heating part of the welding cutting bases 2,34 is 300 ° C, and at 100 (shots / min) it is 280
℃, 80 (shots / minute) at 250 ℃, 50 (shots / minute)
Min) is 200 ° C. When it is necessary to add a correction to the temperature setting due to various environmental conditions, the correction is performed. This correction may be performed artificially, or the CPU may perform an operation according to the correction formula.

Thereafter, the bag making operation is performed according to the setting of such conditions.

As shown in FIGS. 1 and 3, the motor Mb drives the film drawing roller 12 to draw the film F from the original 10. The film wound on the material 10 is formed into a cylindrical shape, and is wound in a flat state. The pulled-out film F hangs down to the storage section G. The excess and deficiency of the withdrawal amount of the film F is determined by the sensors 15a,
It is detected by b, the rotation speed of the motor Mb is controlled according to the detection output, and the film supply amount is adjusted. The film F passes through the guide rolls 16, 17, 18 and then the roller group 20.
And is sent to the upper left part of the gantry 11 shown in FIG. As shown in FIG. 2, in this portion, the film F is intermittently sent out by the film supply roller 21 and supplied to the middle of the facing welding cutting bases 32 and 34.

The power of the main motor Ma is transmitted to the main drive shaft 48 by the toothed belt 46. Further main drive shaft
The rotational force of 48 is transmitted to the driven pulley 52 by the drive pulley 49 and the belt 51, and the cam shaft 53 is driven. When the cam 54 fixed to the cam shaft 53 rotates, the follower
The swing link 62 provided with 61 swings. This power is transmitted to each rotary link 38 by the drive link 64 and the connecting link 65, and the movable base 33 is driven in the (a)-(b) directions by the rod 37 connected to this rotary link 38. When the movable base 33 is moved in the direction (a), the cutter 35 first cuts the film F welded in the previous cycle. Immediately after that, the welding cutting base 34 provided on the movable side base 33 is pressed against the welding cutting base 32 on the fixed side, and the lower end of the film is heat-welded in an arc shape by the heating portion (see symbol A in FIG. 12). .

The rotational force of the main drive shaft 48 driving the welding cutting mechanism 30 is input to the input shaft 75 of the transmission box 74 shown in FIG. 4 by the drive pulley 71, the toothed belt 72 and the driven pulley 73. . From the output shaft 76 of the speed change box 74, for example, the speed change rotation shown in the diagram of FIG. 6 is output.
This rotation output is accelerated by the speed increasing gear group 78 and input to the input shaft 82 of the pulse generator 81. And pulse generator
From 81, a pulse corresponding to the rotation output shown in FIG. 6 is generated. This pulse corresponds to the rotation output of FIG. 6, as schematically shown in FIG.
The frequency distribution is according to the speed change of the output. The setting pulse VII output from the pulse generator 81 is thinned and divided by the frequency converter 91 according to an instruction from the CPU 92. As a result, a pulse as schematically shown in FIG. 8 is formed. The frequency of this pulse is distributed at the same ratio as the setting pulse VII shown in FIG. 7, but the number of pulses in one cycle is reduced. The pulse thus frequency-divided is replaced by a change in voltage by the frequency / voltage converter 93, whereby the rotation speed of the servomotor Mc is set. The frequency-divided pulse is analog-converted by the digital / analog converter 96. Then, the pulse sent from the pulse generator 97 provided in the servo motor Mc is compared with the frequency-divided pulse number as the drive signal, and the servo motor Mc rotates by a rotation angle corresponding to the pulse number after frequency division. That is, the film supply roller 21 driven by the motor Mc is driven according to the divided pulses shown in FIG. In the actual operation, the welding and cutting operations by the welding cutting mechanism 30 are completed, and the servo motor Mc is started while the movable welding base 34 is away from the fixed welding base 32, and the film supply roller 21 Is rotated and the film F is supplied between the welding and fusing bases 32 and 34. The rotation speed of the film supply roller 21 at this time corresponds to the divided pulse output, that is, the rotation output from the transmission box 74 (see FIG. 6) has a similar relationship. in this way,
By the welding cutting mechanism 30 and the film supply operation of the film supply roller 21 which are driven in synchronization with each other by the rotation of the main motor Ma, the bag shown in FIG. 12 is continuously manufactured.

In the above series of operations, first, the length of the bag body manufactured is set by changing the film length supplied by the film supply roller 21 in one cycle.
This is realized by the frequency conversion rate instruction from the CPU shown in FIG. When the frequency converter 91 decimates and divides the pulse number of the setting pulse VII according to the instruction of the CPU, the servo motor Mc rotates by an angle corresponding to the converted pulse number. Therefore, the rotation angle of the film supply roller 21 is determined by frequency conversion, and the film feed amount in one cycle, that is, the length of the bag body manufactured is determined.

Also, the number of bags manufactured per unit time (welding cutting base 34
Number of shots), that is, the number of operations of the welding cutting mechanism 30 and the film supply roller 21, is determined by the number of rotations of the main motor Ma set based on the instruction from the CPU as described above. When the rotation speed of the main motor Ma is set, the movable side base 33 driven by the cam 54 operates only the number of times corresponding to this rotation speed. The speed of each rotation input of the speed change box 74 and the pulse generator 81 depends on the rotation speed of the main motor Ma. Therefore, the frequency of the pulse generated from the pulse generator 81 is
It will be changed depending on the speed of Ma, the servo motor
The speed of Mc is set according to the change in pulse frequency. In this case, the frequency of the pulse is changed as a whole pulse group while maintaining the frequency distribution shown in FIG. As a result, the servo motor Mc and the welding / cutting mechanism 30 maintain their synchronous relationship, and the speed of one cycle changes according to the rotation speed of the main motor Ma, which determines the number of bags manufactured per unit time. Will be done. In this case as well, the rotation angle of the servo motor Mc can be freely changed according to the conversion rate of the pulse frequency (according to the number of pulses for motor control). Therefore, regardless of the number of bags made per unit time, Of course, the length of can be changed freely. Further, the amount of film used per unit time is obtained by multiplying the number of manufactured bag bodies (the number of operation shots) by the length of one film feed by the film supply roller 21.

The above conditions are set according to the calculation result by the CPU. FIG. 9 is a chart showing an example of calculation. In an actual device, the rotation speed of the main motor Ma is limited. Therefore, as one limitation, the number of operations of the welding cutting mechanism 30 and the film supply roller 21 is limited to 120 shots per minute. As another restriction, the feed length of the film F is set to 80 m per minute. Under such constraints,
Enter the film cut length (bag length) as shown in the chart. The CPU determines whether or not the value obtained by dividing the film feed length for 1 minute (film consumption amount for 1 minute; in this case, the limit is 80 m) by the film cut length exceeds 120. If not exceeded (120 shots)
In the following cases), set the film processing speed to 80 m / min. If the number of shots exceeds 120, the film processing speed is determined by limiting the number of shots to 120 and multiplying the film cut length by 120. Third
The rotation speed of the film drawing motor Mb shown in the figure is determined according to the film processing speed. Then, the CPU issues a command of the temperature condition of the welding heating unit according to the determined number of shots, by which the heating temperature of the heater provided in the welding cutting bases 32 and 34 is set, and the welding temperature of the film is It will be set to a value corresponding to the number of shots.

Next, the case of using the CCD camera 19 will be described.

The control by the CCD camera 19 is for preventing the produced bag body from being displaced in the pattern when the pattern is printed on the film F. In this case, the target pattern H on the film F is captured by the CCD camera 19 as shown in FIG. The film F is intermittently fed by the film supply roller 21, but when the intermittent feeding is stopped, the CCD camera 19
The stop position of the target pattern H is measured by. This measured value is sent to the CPU, and the film feed error is recognized. The film feed error is corrected by the frequency conversion command to the frequency converter 91 shown in FIG. That is, the frequency conversion rate by the frequency converter 91 is set according to the amount by which the film feed error is corrected. As a result, the error correction amount is added to the number of pulses for controlling the servo motor Mc, and the rotation angle of the servo motor Mc is corrected.
Therefore, the rotation angle of the film supply roller 21 is corrected, and the position of the pattern of the film sent to the welding and cutting mechanism 30 is set so as not to deviate from the welding and cutting positions.
Note that the correction amount in this case does not correct the error of the film feed length caused by the immediately preceding cycle by one time, but
It is set to correct at an appropriate ratio, such as 1/3, 1/2, or 2/3 of the error δ (see FIG. 10) due to the immediately preceding cycle. As a result, even if the CCD camera 19 fails to detect the target pattern H, extreme correction can be prevented in the next cycle.

In the bag making apparatus in the above embodiment, the main motor Ma, the motor Mb for pulling out the film from the raw material 10, the various controls of the motor Mc for driving the film supply roller 21, and the temperature control by the heater in the welding cutting base are all CPU. It will be carried out based on the command from. Therefore,
This CPU can set various conditions other than the above mechanism.

First, in this type of bag manufacturing apparatus, not only the length but also the width dimension are appropriately changed according to the required size of the bag body.
In this case, the width dimension of the film F itself supplied from the original fabric is changed. In this case, it is necessary to change the set interval of the guide member provided on each guide roller in order to regulate the width of the film fed by each guide roller. The position of each guide member provided on each guide roller can be moved collectively by a drive source such as a servo motor, and the amount of movement from the CPU to the servo motor can be changed according to the input width of the film to be used. It is also possible to automatically set the interval between the width-regulating guide members by giving the above data. Alternatively, a sensor for detecting the width of the material 10 or the width of the film F supplied is provided,
A detection signal from this sensor may be input to the CPU, and a guide member for width regulation may be automatically set according to a command from the CPU.

Further, a meandering preventive device is provided at the position of the roller group indicated by reference numeral 20 in FIG. This device comprises a meandering detector and a meandering correction roller. In this device, a command is issued from the CPU in response to a change in the width dimension of the film supplied from the original fabric 10, and the arrangement interval of the meandering detection device is automatically changed. It is also possible to control the settings of the controller.

Further, the CCD camera 19 is provided in the bag making apparatus, but the camera position needs to be changed according to the stop position of the pattern H of the film to be used, that is, the pattern H targeted for control. In this case, the target pattern position of the film to be used can be input or stored as a numerical value, and the position of the CCD camera 19 can be automatically changed by a command from the CPU.

Further, as disclosed in Japanese Utility Model Laid-Open No. 58-110424, in this type of bag-making apparatus, bag bodies that have been manufactured by the welding cutting mechanism 30 are sequentially inserted into stack pins, and after this reaches a certain number. A mechanism for chucking both ends of the bag and discharging the bag may be provided. In this case, it is also possible to issue a command from the CPU according to the change in the width dimension of the film to be used so that the distance between the stack pin and the chucking holder is automatically set.

Further, as disclosed in JP-A-59-162035,
It is possible to provide a cooling mechanism in the bag making apparatus. This cooling mechanism is for separating the heat-sealing lines A of the manufactured bags from each other or shifting their positions to prevent the bags from sticking to each other by the heat-sealing lines A. When this cooling mechanism is provided, it is necessary to change the set height according to the length 1 of the bag body to be manufactured. As described above, in this bag-making machine, the film feed length l
Is input or the CPU advances the film feed length l
Is calculated, the height of the cooling mechanism can be calculated based on the data, and a command from the CPU can be transmitted to a motor or the like to automatically set the height position of the cooling mechanism.

Further, by providing a CPU, it is possible to create quality control data for each lot, for example. In other words, if one lot of bags to be manufactured is, for example, 1000 bags, it is possible to detect the manufacturing dimensions of these 1000 bags and the thickness dimension of the twist-twist seal part with a sensor and store them as data. Is. At this time, it is possible to collect the data of each bag of one lot and calculate the average value, but only one of the production bags of one lot (for example, the one manufactured at the end of the lot) is measured. By storing the data, it is also useful for quality control. This quality control data can be stored in RAM and printed out as a display or hard copy. This facilitates quality control for each lot. In particular, when the manufacturing dimensions are changed for each lot, the quality control data is left, and the subsequent data processing can be applied to the variation of the quality and the cost calculation.

In addition, as a method of using the CPU, when the production schedule for each lot is to be produced, for example, when a certain number of pieces of a certain size are produced and then a certain number of pieces of which the bag length l is changed are produced, By storing this production plan, it becomes possible to continue the automatic work for a certain period of time.

〔The invention's effect〕

As described above, in the present invention, when the rate of change in the number of pulses of the pulse train by the frequency converting means is changed, the welding cutting member does not change the synchronous relationship between the pressure contact and separation operations of the welding cutting member and the bag material feeding speed. Only the feed length dimension of the bag material in between can be varied. Therefore, the length dimension of the bag to be manufactured can be set or changed by electrical control of the frequency conversion means. The number of bags manufactured per predetermined time can be adjusted by changing the rotation speed of the rotational power obtained from the power source per predetermined time. In this way, the manufacturing conditions can be changed by a simple setup operation.

[Brief description of drawings]

1 to 10 show an embodiment of the present invention. FIG. 1 is a front view showing the entire structure of a bag making apparatus, and FIG. 2 shows a welding cutting mechanism and a drive unit of a film feed roller. Fig. 3 is a partial perspective view showing the film drawing mechanism and CCD from the original fabric.
FIG. 4 is a partial perspective view showing a measuring unit by a camera, FIG. 4 is a view showing a transmission box and a pulse generator, and is a view taken in the direction of arrow IV in FIG. 2, FIG. 5 is a block diagram showing a pulse control device, and FIG. FIG. 7 is a diagram showing the rotation output of the transmission box, FIG. 7 is a diagram schematically showing pulses emitted from a pulse generator, and FIG.
Figure is a diagram schematically showing the pulse after frequency conversion, Figure 9 is a chart showing an example of commands by the CPU, Figure 10 is a partial side view showing the measurement operation by the CCD camera, and Figure 11 is a conventional product. FIG. 12 is a partial perspective view showing the bag device, and FIG. 12 is a perspective view showing the manufactured bag body. 10 …… Film original, 12 …… Film pull-out roller,
19 …… CCD camera, 21 …… Film feed roller, 30 ……
Weld cutting mechanism, 31 …… Fixed side base, 33 …… Movable side base,
32,34 …… Weld cutting base, 35 …… Cutter, 48 …… Main drive shaft, 53 …… Camshaft, 74 …… Shift box, 75 …… Shift box input shaft, 76 …… Shift box output shaft , 81 …… Pulse generator, 82 …… Pulse generator input shaft, F …… Film, Ma …… Main motor, Mb…
… Film pull-out motor, Mc… Servo motor that drives the film supply shaft.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-162034 (JP, A) JP-A-54-42266 (JP, A) JP-A-60-13533 (JP, A) JP-B-49- 27548 (JP, B2)

Claims (1)

[Claims] 1. A pair of welding and cutting members, which are arranged to face each other and have a welding portion for welding the bag material and a cutting mechanism for cutting the bag material, and the welding and cutting member for converting rotational power into reciprocating motion. It has a drive mechanism that presses and separates them from each other, and a speed change means that receives rotational power obtained from the same drive source as the drive mechanism and obtains a speed change rotation output, and the welding cutting member is pressed against each other from the speed change means. When the speed decreases and the welding cutting member separates, a variable speed rotation output that accelerates is obtained, and pulse generating means for generating a pulse train having a pulse interval change corresponding to the speed change of the variable speed rotation output; Frequency conversion means for changing the number of pulses per predetermined time, a motor whose rotation speed is controlled by the pulse train obtained by the frequency conversion means, and a motor driven by this motor A bag-making apparatus having a roller for supplying a bag material between the welding and cutting members, wherein the rate of change in the number of pulses in the frequency converting means can be changed according to the length of the bag to be manufactured. .