JP2967165B2 - Drive motor control device for packaging machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed control device for a motor for operating each section of a bag making, filling and packaging machine.

[0002]

2. Description of the Related Art On the other hand, a bag making, filling and packaging machine basically forms a film into a tube, fills an object to be packaged therein, and cuts and seals the tube film.
The structure is such that a continuous belt-like film is formed into a tube in the longitudinal direction, objects to be packaged are carried into the tube film at equal intervals, and the tube film is cross-sealed between the objects to be packaged.

Therefore, this type of packaging machine is provided with at least a motor for transporting a film, a motor for carrying in an article to be packaged, and a motor for rotating a sealer, and the rotational speed of each motor is controlled by a microcomputer. ing.

For example, Japanese Patent Application Laid-Open No. Sho 63-218008 discloses that a speed of a film transfer motor and a speed of a sealer rotation motor are controlled on the basis of the speed of the motor for transporting the packaged product at a constant speed. On the other hand, Japanese Patent Application Laid-Open No. 63-281913 discloses means for controlling the respective speeds of the motor for transporting the packaged object and the motor for rotating the sealer based on the speed of the motor for transporting the film.

[0005]

In the case of this type of packaging machine, when an operation stop signal is transmitted, the reference motor stops at a predetermined home position, and the other two motors are located between the reference motor and the reference motor. Thus, the vehicle stops at the position of the predetermined deviation angle. For example, of the above two types of packaging machines, the former one is such that when the motor for carrying in the package is stopped at the origin position by the stop signal, the motor for transferring the film and the motor for rotating the sealer are provided with the above-mentioned packaged machine. The motor stops at a predetermined position with respect to the carry-in motor. As a result, the sealer comes into contact with the film and stops, causing a problem that the film is melted by the heat of the sealer while the operation is stopped.

Since these motors are originally positioned by computer control, position control for avoiding contact of the sealer with the film is easy. However, it is inevitable that the sealer touches the film when the origin position of the sealer is changed according to the length of the packaged object or the printing pitch of the film. Therefore, considering this point,
It is most appropriate to control other motors based on the sealer rotation motor.

JP-A-63-26 and JP-A-63-960
No. 16 discloses that the movement of the seal shaft is converted into a pulse signal and input to a computer to adjust the film feed speed. However, since the seal shaft is rotating at a periodic speed change state, that is, at an irregular speed. However, the technology for accurately controlling the film speed based on the movement of the shaft is far from being a technology.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a method for transferring a continuous strip film through a tube forming means and forming the film as a continuous tube. A film transfer motor, a carry-in motor for feeding the articles to be packaged into the tube film at equal intervals from an inlet portion of the tube-making means, and an inner packaged article at an outlet side of the tube-making means. A control motor for operating a drive motor of a sealer for cross-sealing the tube film at a speed related to each other by a reference pulse signal input to a central processing unit through a cycle setting means, Timing means for outputting one signal at an equal pitch every time the shaft of the rotary sealer operated by the power of the motor rotates once; Comparing means for detecting a phase shift between a force signal and a pulse transmitted from a first encoder attached to the film transfer motor; and an error signal read by the comparison means, the correction signal being used to correct the error signal read by the film transfer motor. And a means for correcting the rotation angle of the film transfer motor in accordance with the rotation timing of the drive motor. A second aspect of the present invention is a film transport motor for transporting a continuous band-shaped film through a tube forming means, and forming the film as a continuous tube into a tube. A periodical setting of a carry-in motor for feeding the articles to be packaged at equal intervals, and a drive motor of a sealer for cross-sealing the tube film between each of the articles to be packaged at the outlet side of the tube-making means. A control device operating at a speed related to each other by a reference pulse signal input to a central processing unit through a means, wherein one signal is generated each time the shaft of the rotary sealer operated by the power of the driving motor rotates once. From the second encoder associated with the output signal from the timing unit and the carry-in transfer motor. A comparison unit for detecting a phase shift between the transmission pulse and the error signal read by the comparison unit, sent to the carry-in motor through a correction device, And means for correcting the rotation angle. A third aspect of the present invention provides a film transport motor for transporting a continuous band-shaped film through a cylinder-forming means and for producing the film as a continuous tube.
A carry-in motor for feeding the articles to be packaged into the tube film at equal intervals from an inlet portion of the tube-making means, and a sealer support frame at the outlet side of the tube-making means in the same direction as the transfer direction of the tube film. And a frame drive motor for reciprocating the frame and a motor for driving a sealer mounted on the frame and opening and closing a pair of sealers to cross-seal the tube film between each packaged object through the cycle setting means 80. A control device operating at a speed related to each other by a reference pulse signal 79 input to a device 81, a timing means 84 for outputting one signal each time the shaft of the frame driving motor 63 makes one rotation; The output signal from the timing means and the transmission signal of the encog 86 attached to the film transfer motor are centered. Means for detecting a phase shift between the compared to two signals with management device 81, in accordance with the timing of the frame drive motor based on the detection data constituting a means for correcting the rotational angle of the film transfer motor.

[0009]

When the reference pulse signal is input to the central processing unit through the cycle setting means, three motors connected to the central processing unit, ie, a film transfer motor, a carry-in motor, and a sealer drive motor are respectively set to the cycle setting means. It rotates at an interrelated speed under the control of the means. In this case, the film transfer motor and the carry-in motor rotate at an average speed, but only the sealer drive motor has a constraint to rotate a pair of sealers at the same speed as the film in a part of one rotation. The cyclic shift is repeated, and the cycle speed is controlled so as to be variously changed according to the change of the film cut pitch. Since the synchronous rotation of the three motors is only a command from the central processing unit, it is only apparent synchronization, and a slight synchronization deviation may occur between the three motors. Therefore, the sealer driving motor outputs one signal at a constant pitch every time the shaft of the rotary sealer makes one revolution by the timing means, and outputs this signal and the first encoder attached to the film transport motor. Is sent to the comparing means to read out the rotation angles of both motors, and this error signal is sent to the film transfer motor through the correction device. Therefore, the film is synchronized with the timing of one rotation per rotation of the drive motor. The deviation of the rotation angle of the transfer motor is corrected.

The output signal from the timing means provided on the shaft of the motor for driving the sealer and the output signal from the second encoder attached to the carry-in motor are input to the comparison means, and the signal is output between the two motors. The rotational deviation of the carry-in motor with respect to the sealer driving motor is corrected by the correction means.

According to a third aspect of the present invention, the output signal from the timing means provided on the shaft of the drive motor of the sealer support frame and the output signal from the first encoder attached to the film transfer motor are input to the comparison means. Then, the rotational deviation between the two motors is read out, and the rotational deviation of the film transport motor with respect to the frame driving motor is corrected by the correction means.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a feed roll 11 rotated by a first motor 10 draws a belt-like film 12 and feeds it in the direction of a cylinder forming means 13. The belt-like film 12, which is pulled by the rotation of the upper and lower belts 14, 15 installed behind the cylinder-making means, is formed on the tube 16 when passing through the cylinder-making means 13.

The conveyor 17 installed on the inlet side of the cylinder-making means 13 rotates continuously by the power of the second motor 18 and pushes the articles 19 to be packaged by the attachment 20 to feed them into the tube film 16 at equal intervals.

A pair of shafts 2 provided behind the belt 14
Sealers 23 and 24 are provided on the peripheral surfaces of the shafts 1 and 22 in parallel with the center line of the shaft. Since the two shafts are connected to each other by a spur gear (not shown), when one shaft 21 is driven by the third motor 25, the two shafts 21 and 22 rotate in opposite directions. For this reason, the sealers 23 and 24 intermittently press the tube film, weld and cut the pressing portion, thereby forming a bag 26 in which the packaged material is sealed.

A clock 28 connected to a microprocessor or central processing unit 27 further subdivides the movement of the second hand and emits 120 electrical pulses per second. A watch equipped with a crystal oscillator as a signal source is suitable for accuracy.
The cycle setting device 29 connected to the timepiece has a function of setting, for example, 100 pulses as one cycle out of 120 pulses. That is, as shown in FIG. 2, one cycle (100 pulses) is 0.83 seconds, and the third cycle is as follows.
The power output from the motor 25 via the speed reducer 30 is
The sealer 23 makes one revolution per 0.83 seconds.

That is, the cam 32 and the encoder 33 are provided on the shaft 31 of the third motor 25. The cam 32 is a shaft 3
Each time 1 rotates one time, it contacts the switch 34 and inputs the rotation cycle of the shaft 31 to the central processing unit 27. On the other hand, the pulse signal output from the encoder 33 feeds back the subdivision angle of the shaft 31 to the central processing unit 27. Then, while reading the signal from the cam switch 34, the movement of the third motor 25 is controlled so that the shaft 31 makes exactly one rotation per 0.83 seconds.

On the other hand, from the cycle setting means 29 to the central processing unit 2
7 to give a command to the first motor 10
Control is performed such that the mark printed on the film 12 moves by one pitch per 0.83 seconds.

Also, the second attachment 20 of the conveyor 17 is moved by one pitch every 0.830 seconds.
An instruction is given to the motor 18. In this case, the mark printed on the film is detected by the sensor 37. Feedback signals from the encoders 35 and 36 provided on the motor shaft are used for motor speed control.

When the length of an article to be packaged is input as a numerical value to the central processing unit 27 using the input device 40 shown in FIGS. 3 and 4, specific information is extracted from the memory 41 so as to match the numerical value. . This extracted information is
In FIG. 1, the film 12 is adjusted according to the length of the article 19 to be packaged.
To set the transfer speed of the
3 and 24 are set. Therefore, in FIG. 3, while the speed of the second motor 18 is kept constant, the speed of the first motor 10 is set to change the speed, and the periodic transmission 42 changes the changing speed of the periodic speed of the third motor 25.

In FIG. 5, assuming that the seal width S1 between the packages 19 is always kept constant, a package having a long length L2 compared to a short L1 has a difference in length. It should be easy to understand the need to increase the speed of the tube film 16 by this amount.

In FIG. 2, one cycle (0.83 sec.)
The ratio of the time T0 during which the sealer is in contact with the film in c) varies slightly depending on the speed of the film.
When the film speed is high H, the sealer must be kept at the same speed as the film at the time of contact T0. Therefore, while the sealer is away from the film, the sealer is kept at a relatively low speed L while keeping the sealer away from the film. The cycle is kept at 0.83 sec. Conversely, if the sealer speed at the time of contact T0 is relatively low L, the sealer speed when the film is separated from the film is kept at high speed H1 or H2, and one cycle is 0.83 sec.
To hold.

In FIG. 4, the rotation angle of the shaft of the third motor 25 is detected by the subdivision angle detection means 33 such as an encoder, and the data is fed back to the central processing unit 27 to set the rotation cycle of the third motor 25 to 0, Since the control is accurately performed in 83 seconds, the timing means 32 by the electronic cam is used.
One timing signal per 0.83 sec output from the first encoder 45 and pulse signals output from the first encoder 45 and the second encoder 46 are compared by the comparing devices 47 and 48. The cycle deviation between the first motor 10 and the second motor 18 is corrected.

As compared with the embodiment described so far, in FIG. 6, the third motor 63 connects the frame 60 to the guide rail 61.
And the upper and lower sealers 74 and 75 provided on the frame 60 are operated by a fourth motor 69.

That is, the feed roll 52 rotated by the first motor 51 pulls out the belt-like film 53,
It is supplied in the direction of the cylinder making means 54. The belt-like film 53 which is pulled by the rotation of the upper and lower belts 55 and 56 installed behind the tube-making means is formed on the tube 57 when passing through the tube-making means 54.

The conveyor 58 installed on the inlet side of the cylinder-making means 54 rotates continuously by the power of the second motor, and
Is pushed by the attachment 91 and fed into the tube film 57 at equal intervals.

Immediately behind the belt 55, a frame 60 is supported by a guide rail 61 and installed. FIG.
The frame 60 is almost frame-shaped as shown in FIG.
The guide rails 61 support both sides of the frame 60.

A crank lever 65 provided on an output shaft 64 of the third motor 63 and the frame 60 are connected to a connecting rod 66.
When the crank lever 65 is rotated by the third motor 63, the frame 60 is connected to the guide rail 6.
Reciprocate along 1.

A shaft 68 rotatably provided between both side walls of the frame 60 is connected to a fourth motor 69 mounted on the same frame 60 via two gears 70 and 71, and The both ends of a bell crank 72 fixed to both ends of the shaft 68 and both ends of a pair of sealers 74 and 75 supported by a vertical groove guide 73 of the frame 60 are connected by a link 7.
6, 77 are connected.

Therefore, by inverting the gear 70 in the forward and reverse directions by the fourth motor 69, the upper and lower sealers 74 and 75 relatively close to each other, and after pressing and sealing the tube film 57, separate from each other. In this case, the frame 60 operated by the third motor 63 moves forward in accordance with the moving speed of the tube film 57, and then retreats at a speed speed corresponding to the distance between the front and rear packages 60.

A period setting means 80 connected to a clock 79 using a crystal oscillator as a signal source fixes a fixed reference period by an input to the central processing unit 81.

A cam 82 for the timing means and an encoder 8 for the subdivision angle detecting means are provided on the shaft 64 of the third motor.
3 is provided. Each time the cam 82 makes one rotation, the switch 84
, The rotation cycle of the shaft 64 is input to the central processing unit 81, and the rotation cycle of the third motor 63 is set by collation with the reference cycle specified by the cycle setting device 80. In this case, the subdivision angle detection data fed back from the encoder 83 to the central processing unit 81 functions as auxiliary data for setting the cycle.

From the input device 85 to the central processing unit 81
When the length of the packaged object 90 is input as a numerical value, the first motor 51 adjusts the feeding speed of the film 53 based on the data stored in the central processing unit, and at the same time, reads the feedback signal from the encoder 86. ,
The cyclic speed of the third motor 63, that is, the frame 60
Is changed so that the speed of the film coincides with the forward speed of the film.

The central processing unit 81 includes a third motor 63
The timing of the forward / reverse point of the fourth motor 69 is controlled so that the upper and lower sealers 74 and 75 operate in accordance with the movement of the frame 60 reciprocating.

A timing signal from an electronic cam constituted by a cam 82 and a switch 84 is sent to a central processing unit 81, and the central processing unit 81 controls the encoder 86,
The deviation of the rotation angle of the first and second motors 51 and 59 fed back from the motor 87 is read out, and a correction signal based on the movement of the axis of the third motor 63 is sent to both the motors 51 and 59. Can be

[0035]

According to the present invention, the rotation periods of the three motors are apparently set with reference to the pulse generated from the reference pulse generation source, and the rotation motors are provided on the shaft of the sealer driving motor that periodically shifts among the motors. A comparison is made between a signal output one by one per rotation from the timing means and a feedback pulse signal from another film transfer motor or a packaged object carry-in motor, and a film transfer motor or a film transfer motor based on a sealer drive motor is used as a reference. Detects the subtle periodical deviation of the motor for loading the packaged object and corrects the deviation between the motors.This control enables operation based on the motor for driving the sealer, so that when the operation is stopped, the sealer contacts the film. Stopping is possible at the avoided origin position. As a result, in response to a change in the length of the packaged product or a change in the print mark on the film, the film and the packaged-in conveyor must be moved while the sealer is stopped at the origin position. Melting by heat can be prevented.

[Brief description of the drawings]

FIG. 1 is a three-dimensional side view of the apparatus.

FIG. 2 is an explanatory diagram of a cyclic shift speed of a sealer.

FIG. 3 is an explanatory view of the configuration of the apparatus.

FIG. 4 is an explanatory diagram based on a block diagram of the apparatus.

FIG. 5 is an explanatory diagram relating to a film speed according to the length of a packaged object.

FIG. 6 is a side view of an apparatus according to different embodiments.

FIG. 7 is a view taken along the line VII-VII in the preceding figure.

[Explanation of symbols]

10: Film transport motor 12: Strip film 1
3 ... Cylinder-making means 16 ... Tube 18 ... Motor for carrying in packaged goods 23,24 ... Sealer 25 ... Sealer driving motor
28 pulse generation source 29 cycle setting means 32 timing means 33 subdivision angle detecting means 35, 36 encoder 51 ... first motor 58 ... conveyor 5
9 ... 2nd motor 60 ... frame 61 ... guide rail 63 ... 3rd motor 64 ... output shaft 65 ...
‥ Crank lever 69 ‥ Fourth motor 72 ‥ Bell crank 74,75 ‥ Sealer 80 ‥ Cycle setting means 81 手段 Central processing unit 82 ‥ Timing means
83 ... ‥ Subdivision angle detecting means 85… ‥ Input device

Claims (3)

(57) [Claims] 1. A film transfer motor for transferring a continuous belt-shaped film through a tube forming means, and forming the film as a continuous tube into the tube film from an inlet portion of the tube forming means. A carry-in motor for feeding the articles to be packaged at equal intervals, and a drive motor for a sealer for cross-sealing the tube film between each of the articles to be packaged at the outlet side of the tube-making means are periodically provided.
Reference pulse signal input to the central processing unit through the
A control device that operates at a speed related to each other by a signal, the timing device outputting one signal at an equal pitch every time the shaft of the rotary sealer operated by the power of the driving motor rotates once; Means for detecting a phase shift between an output signal from the means and a pulse transmitted from a first encoder associated with the film transfer motor.
Correcting the error signal read by the comparing means.
Through the device to the film transfer motor,
Means for correcting the rotation angle of the film transfer motor in accordance with the rotation timing of the moving motor . 2. A continuous strip film is passed through a cylinder forming means.
And transfer the film into a continuous tube.
Motor for transferring a film, and an inlet of the cylinder forming means
Parts to be packaged into the tube film
A carry-in motor for feeding in, and an outlet side of the cylinder making means
, The tube film between the respective inner packaged objects.
The sealer drive motor that cross seals the
Reference pulse signal input to the central processing unit through the
Control devices that operate at interrelated speeds depending on the signal
And a rotary sealer operated by the power of the driving motor.
Outputs one signal at equal pitch every time the shaft makes one revolution
Timing means, and an output signal from the timing means
From the second encoder attached to the carry-in motor
Comparing means for detecting a phase shift between the received pulse and
The error signal read by the comparing means is passed through a correction device.
To the carry-in motor and rotate the drive motor.
A motor control device configured to correct the rotation angle of the carry-in motor in accordance with timing . 3. A film transfer motor for transferring a continuous band-shaped film through a tube forming means and forming the film as a continuous tube into a tube from an inlet portion of the tube forming means. A carry-in motor for feeding the articles to be packaged at equal intervals, a frame drive motor for reciprocating the sealer support frame in the same direction as the tube film transfer direction on the outlet side of the tube-making means, and mounted on the frame. And a sealer driving motor for opening and closing a pair of sealers to cross-seal the tube film between each packaged object, and a reference pulse signal 79 input to the central processing unit 81 through the cycle setting means 80.
A control device that operates at a speed related to each other, and the shaft of the frame drive motor 63 makes one rotation each time.
Timing means 84 for outputting one signal;
Output signal from the filming means and the film transfer motor
And the central processing unit
Means for detecting the phase shift between the two signals by comparing at 81,
Based on the detection data, the timing of the frame drive motor
Means for correcting the rotation angle of the film transfer motor in accordance with the speed of the film.