JPH08143003A - Operation controller of packaging machine - Google Patents

Abstract

PURPOSE: To smooth operation control without loading a frame having a heavy load frame on control variable speed function by controlling drive of a motor for carrying objects to be packaged, a film transfer motor and a seal bar open/ close motor synchronously with rotation of a seal frame reciprocating motor. CONSTITUTION: While a lever 66 is swung by a rotating lead of a cam 62 rotating at a constant speed by a motor 55, a frame 29 is reciprocated by the swing of the lever 66. Rotation of this motor 55 is converted into a pulse signal by an encoder 84 and input to a controller 85 for processing, and an output signal from the controller 85 is sent to respective motors 56, 57, 58 through a synchronizer, whereby the motor 56 for supplying objects to be packaged, the motor 57 for carrying a frame and the motor 58 for opening/closing a seal bar are respectively rotated synchronously with the motor 55. Further an inverter between the synchronizer and the motor 58 controls opening/closing of seal bars 52, 53 with timing aligned with reciprocation of the frame 29. Thus a load to a motor at the time of varying motor speed can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed for transporting a large number of articles to be packaged at equal intervals in a row, a film transport speed for covering a long film around each article to be packaged in a tubular shape, and the tubular film. The present invention relates to an operation control device that synchronously controls the cycle speed of a sealer that cross-seals each packaged object.

[0002]

2. Description of the Related Art JP-A-61-2599 and JP-A-62-1599
As shown in FIG. 5, 109712 changes the speed of the power source motor 3 of the conveyor 2 that conveys the objects to be packaged 1 at equal intervals in a row into the electric signal 4 and inputs it to the computer 5 for processing. With the output signals 6 and 7 of
A control device for synchronously rotating the transport motor 9 of the film 8 and the power source motor 11 of the rotary sealer 10 is disclosed. In the above apparatus, the speed of the motor 3 is kept constant, and the motor 9,
It is provided with a function of performing control for synchronizing 11 with the motor 3.

[0003]

However, when the packaging machine equipped with the box motion type sealing device is operated and controlled by the above-mentioned method, a control deviation may occur.

That is, for example, when welding a thick packaging material, it is necessary to maintain the heating time of the packaging material for a moment or more. Therefore, the frame supporting the seal bar is reciprocated in the moving direction of the packaging material to seal. The bar must be operated in box motion track. According to the existing box motion type seal device, the support frame of the seal bar may be 50 kg or more, and if the speed of such a heavy frame is controlled by gear shifting of the motor, the load on the motor is inevitably large. Control deviation occurs.

[0005]

In order to eliminate the above-mentioned drawbacks, the present invention provides a third motor for transporting a belt-shaped film in a longitudinal direction through a tube making mechanism, and a tube made by the tube making mechanism. A second motor for feeding the articles to be packaged in the film at equal intervals in a row and a pair of seal bar support frames arranged above and below the track of the tube film accommodating the articles to be packaged. The encoder includes a first motor that reciprocates in the moving direction of the tube film by a motion, and a bell crank reversing fourth motor that causes the pair of seal bars to come into contact with and separate from each other, and an encoder that is moved by the first motor. A synchronizing device for synchronizing the rotation of each of the second and third motors with the rotation of the first motor by means of a digital output of a controller for processing the pulse of , Said reversing device to a signal line connecting the synchronizer and said fourth motor provided are those configured to set the reciprocation of the the inverting action of the fourth motor frame synchronization relationship.

[0006]

The lever is oscillated by the rotating lead of the cam which rotates at a constant speed by the first motor, and the oscillating movement of the lever causes the frame to reciprocate. The rotation of the first motor is converted into a pulse signal by an encoder and input to a controller for processing, and an output signal from the controller is sent to each motor through a synchronizer. Therefore, a second motor and a film for supplying a packaged object. Third motor for transportation and fourth motor for opening and closing the seal bar
Each of the motors rotates synchronously with the first motor. Further, the reversing device between the synchronizing device and the fourth motor controls the opening / closing action of the seal bar in synchronism with the forward and backward movement of the frame.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in FIG.
The band-shaped film 23 unwound from the roll film 22 is fed to the tube-making means 24 by the feeding roll 21 rotated by the driving force of the motor 57, and the band-shaped film 23 is rolled into a tube shape by the tube-making means, and the palm portions on both side edges of the film Are continuously welded by the center sealer 25. While the second
A conveyor 26 rotated by a motor 56 carries a large number of articles 27 to be packed into the tube film 28 at equal intervals in a vertical line.

A frame 29 is supported on a guide rail 20 parallel to the transportation path of the tube film 28, and the machine base 6
The output shaft 61 of the first motor 55 fixed to 0 and the shaft 63 of the cam 62 also supported on the machine base 60 are connected via a chain 64, and the main body pivotally supported on the machine base 60 via pins 65. A pin 67 of the lever 66 is engaged with an endless groove 68 formed on the surface of the cam 62, and a sub lever 70 having one end engaged with the frame 26 and the main lever 66 are connected by a connecting rod 71. Then, when the cam 62 is rotated by the power of the first motor 65, the lead of the cam groove 68 causes the main lever 66 and the sufflever 70 to swing around the pins 65 and 72 at the lower ends, respectively, so that the frame 29 is guided to the guide rail 20. Along the tube film 2
Reciprocates at the same speed as 8.

The frame 29 is specifically shown from the front side as shown in FIG. In addition to vertically supporting the columnar guide 31 on the upper surfaces of the two blocks 30 arranged to be supported by the two horizontal guide rails 20 described above,
Both ends of upper and lower two frame members 32 and 33 are slidably supported by these columnar guides through sleeves 34 and 35.
Further, side plates 37 fixed to the outer surfaces of both blocks 30 with screws 36 are erected in parallel with the columnar guides 31, and the upper ends of the two columnar guides 31 and the two side plates 37 are integrated by a top plate 38. To form a portal frame 29. Also, the lateral holes 39 formed in the blocks 30 on both sides
In addition, a shaft 41 is rotatably supported via a bearing 40, and bell cranks 42 are provided at both ends of the shaft 41, respectively.
The bell cranks at both ends and the upper and lower erection members 32,
Both ends of 33 are connected via links 43 and 44 (see FIG. 1 for such structure). Therefore, if the bell crank 42 is alternately inverted in the forward and reverse directions integrally with the shaft 41,
Along with this, the upper and lower bridge members 32, 33 approach and separate from each other. In this case, the frame members 32 and 33 fitted in the vertically long slits 45 formed on both side plates without slack move up and down along the slits 45.

Further, a base 46 installed between both blocks
A fourth servomotor 47 equipped with a speed reducer is installed on the above, and a pinion 48 provided on the shaft of the fourth motor and a gear 48 fixed to the shaft 41 are engaged to drive the fourth motor 47. As a power source, the shaft 41 is configured to be inverted. Piston rod 51 of air cylinder 50 on the upper surface of upper frame 32
When the seal bar 52 fixed to the tube collides with the seal bar 53 on the upper surface of the lower frame member 33, the tube film 1 is buffered by the compressed air sent to the air cylinder 50.
5 is crushed, and the film is cut with the blade housed in the seal bar.

In FIG. 1, the frame 29 has a forward direction 74.
When moving to, the upper and lower seal bars 52 and 53 crush the tube film 28 to heat-seal it, and
When 9 moves in the backward direction 75, both seal bars 52, 5
Since 3 is separated, both seal bars 52, 53 eventually perform a box motion action. In this case frame 29
A conveyor belt 77 supporting wheel shafts 76, 78 on
79 is equipped with variable tension rolls 80 and 81, respectively.
Allows expansion and contraction of 7,79.

A screw rod 8 provided along the main lever 66.
2, a variable block 83 having an internal thread is engaged, and the lower end of the screw rod 82 is connected to the output shaft of the fifth servomotor 58. When the screw rod 82 is rotated by the fifth motor 58 and the variable block 83 is displaced along the main lever 66, the swing width of the sub-lever 70 changes, and the movement amount and speed of the frame 29 proportionally change. To do. The output pulse of the encoder 84 attached to the first motor 55 that drives the cam is sent to the computer 85.
And the rotation of each motor is controlled by the computer.

That is, the drive control device 88 in FIG.
The rotation speed is instructed by a pulse signal sent from the first motor 55 to the first motor 55, and the rotation speed of the first motor 55 is stabilized by forming a closed circuit with the output circuit 86 of the encoder 84, while another output of the encoder is output. Circuit 8
7 is connected to the computer 85. In FIG. 4, since the output circuit 87 is connected to the synchronizer 89 in the computer, the first motor 55 and the second motor 56 are subject to synchronous control, and the reciprocation of the frame 29 operated by the first motor 55. The repeated operation in the direction is synchronized with the feeding pitch of the articles to be packaged on the conveyor 26 rotated by the second motor 56.

Further, as shown in FIG. 4, the output branch circuit of the synchronizer 89 is connected to the third motor 57 and the fourth motor 47. Therefore, the rotational speed of the roll groups 21, 25, 77 receiving the rotational power of the third motor 57 in FIG. 1 and the speed of the frame 29 and the conveyor 26 are controlled in a proportional relationship. In FIG. 4, since the reversing device 90 in front of the fourth motor 47 is operated by the output signal 91 of the synchronizer 89, the reciprocating motion of the frame 29 and the bell crank 42 driven by the fourth motor 47 in FIG. The inversion is controlled in a synchronous state. As a result, the upper and lower seal bars 52, 53 pinch and heat the tube film 28 in the middle of the front and rear objects to be packaged.

The keyboard 93 shown in FIG. 3 is used to instruct the computer 85 on the film cutting pitch.
Generally, when the length of the packaged item changes, the cut pitch of the film can be changed accordingly. When the cut pitch determining device 94 of FIG. 4 determines the cutting length of the film according to the instruction, the film speed selecting device 95 operates accordingly. In FIG. 1, the tube film 2 is naturally used depending on whether the length of the packaged object 27 sent at the same intervals as the intervals of the attachments 96 of the conveyor 26 is short or long.
Since the space between the items to be packaged in 8 changes, it is necessary to change the film speed according to the length of the items to be packaged in order to keep the space between the items to be packaged in the tube film in any case. is there. Therefore, when the film speed selection device 95 operates in FIG. 4, the speed of the third motor 57 is first changed and the speed of the film feed roll 21 is changed. At the same time, the rotation direction and rotation angle of the fifth motor 58 are set via the forward / reverse direction selection device 97 and the rotation angle setting device 98. As a result, the fifth motor 58 in FIG.
Rotates in the selected rotation direction by the determined rotation angle,
The block 83 is displaced to change the reciprocating amount and speed of the frame 29. That is, when the length of the object to be packaged 27 is increased, the speed of the film 23 is reduced, while the amount of reciprocal movement of the frame 29 is increased to increase the cut pitch of the film.
The rocking speed of the film becomes slower, and the relative speed between the film 23 and the frame 29 changes proportionally.

Generally, a short length of a packaged object has a small height, and a large length of the packaged object tends to have a large height.
Then, as shown in FIG. 4, when the cut pitch determining device 94 operates, its output signal 99 is sent to the fourth motor 47 via the rotation angle selecting device 100, and the fourth motor 47 in FIG. Both seal bars 5 according to height
Bell crank 4 to prevent 2, 53 from separating more than necessary
Adjust the reversal angle of 2. Such adjustment eliminates unnecessary opening and closing of the fourth motor 47. In addition, as shown in FIG.
The four motors other than the first motor are encoders 1
It forms a closed circuit comprising 01 to 104.

[0017]

[Effect] The present invention makes the seal frame reciprocate first.
The rotation of the second motor for sending the output pulse of the encoder of the motor to the second and third motors through the synchronizer to feed the article to be packaged into the tube film and the third motor for transferring the film are described above. The rotation of the first motor is controlled synchronously and the reversing action of the fourth motor for opening and closing the seal bar is maintained in a synchronous relationship with the first motor, so that the reciprocating motion of the heavy-load frame is maintained at a constant speed by the first motor. However, the second and third motors that always rotate in the same direction and the opening and closing of the lightweight seal bar may be controlled by the fourth motor, which is different from the first motor. As it does not take, smooth operation control can be performed.

[Brief description of drawings]

[Figure 1] Side view

FIG. 2 is a front view of the sealing device.

FIG. 3 is an explanatory diagram of an electronic device

FIG. 4 is a block diagram of the entire apparatus

FIG. 5 is an explanatory diagram of a conventional example.

[Explanation of symbols]

23 ... Belt-shaped film 24 ... Cylinder manufacturing means 27 ... Packaged object 29 ... Frame 47 ... Fourth motor 52, 53 ... Seal bar 55 ... First motor 56 ... Second motor 57 ...
Third motor 62 ... Cam 66 ... Main lever 85 ... Computer 89 ... Synchronizing device 90 ... Reversing device 94 ... Cut pitch determining device 95 ... Film speed selecting device 97 ... Forward / reverse direction selecting device 98 ... Rotation angle setting device 100 ... Rotation angle Selection device

Claims (3)

[Claims] 1. A third motor for transporting a belt-shaped film in a longitudinal direction through a tube-making mechanism, and a second motor for supplying an object to be packaged into the film tubed by the tube-making mechanism at equal intervals in a column. And a first motor for reciprocating the support frames of the pair of seal bars disposed above and below the track of the tube film accommodating the object to be packaged in the moving direction of the tube film by the swing motion of the lever by the rotation lead of the cam. And a fourth motor for reversing a bell crank that causes the pair of seal bars to come into contact with and separate from each other, and a digital output of a controller that processes an input pulse from an encoder driven by the first motor, A synchronizing device for synchronizing the rotation of each of the second and third motors with the rotation of the first motor is provided, and a signal line connecting the synchronizing device and the fourth motor is further provided. An operation control device for a packaging machine, wherein a reversing device is provided in the engine, and the reversing action of the fourth motor and the reciprocating motion of the frame are set in a synchronous relationship by the synchronizing device signal. 2. A screw rod is rotatably installed along the lever swung by a lead of a rotary cam, and a variable block engaged with the screw rod through a female screw portion and a support frame of a seal bar are connected to each other. With the configuration of connecting via a rod and the input signal input to the computer according to the change in the length of the packaged product fed at a constant pitch into the tube film, the cut pitch determination device and the film speed selection device are operated, One output signal from the film speed selection device is sent to the third motor, and another output signal is sent to the fifth motor through the forward / reverse direction selection device and the rotation angle setting device.
And a reciprocating movement amount of the frame determined by a rotation direction and a rotation angle of a screw rod connected to the fifth motor by the fifth motor, respectively. The operation control device according to claim 1, further comprising: a structure for controlling the length of the packaged object. 3. A cut pitch determining device is operated by an input signal input to a computer in response to a change in the length of an object to be packed fed into the tube film at a constant pitch, and an output signal from the cut pitch determining device is rotated by a rotation angle. The operation control device according to claim 2, wherein the rotation angle selection device controls the reversal angle of the fourth motor in proportion to the length of the article to be packaged by feeding the fourth motor through a selection device.