JPH03275427A - Method and device for end seal positioning in pillow packaging machine - Google Patents

Abstract

PURPOSE:To prevent generation of mispositioning of end seal by a method wherein a sealing bar of an end sealing device, while the device is in sealing operation, operates at peripheral speed the same as sending speed of packing film and, while in non- operation, undergoes quick sending to return to a sealing operation starting position and wait there. CONSTITUTION:In an end sealing device, a servo-motor 87 is driven, while a recessed part 842 of a sealing bar 84 and 84a is moving from a sealing starting position A-A and A'-A' to an sealing ending position B-B and B'-B' in direction Z and Z', to make the peripheral speed of the outer peripheral surface of the recessed part the same as the speed of packing film, and when the sealing bar 84 and 84a returns from a sealing finishing position to the sealing starting position, to return the bar 84 and 84a quickly. When the recessed part is at the sealing starting position, the servo-motor is stopped and the sealing bar is waiting. When an operation starting command based on an original point signal which is sent from an original point sensor to a controller for whole of a packing machine is sent from the controller to the servo-motor 87, the servo-motor rotates to do end sealing operation operation by lateral sealing bar 84 and 84a.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method and apparatus for aligning end seals in a pillow packaging machine.

(b) Prior art A band-shaped packaging film is formed into a cylindrical shape using a bag-making machine, an object to be packaged is fed into the cylindrical packaging film, and the side edges of the packaging film are vertically sealed. Various so-called pillow packaging machines that end-seal the packaging film with an end-sealing device at the front and rear have been developed in the past, as shown in, for example, Japanese Patent Publication No. 16740 and Japanese Patent Application Laid-Open No. 63-20911. There is.

In the packaging machine shown in (■) above, the items to be packaged are fed into a cylindrical packaging film at a constant speed. Since the pitch of the cut marks usually changes depending on the precision of the printing machine used for printing patterns and cut marks, the feeding speed of the packaging film is changed to match the pitch of the cut marks, and the end seal The rotation speed of the device can also be changed.

By the way, in such a packaging machine, (a) the speed of the sealing bar that performs end sealing, that is, the end sealer, and the packaging film must be the same while they are in contact with each other; (
b) The end seal must be located between adjacent packaged items, and (C) The cut mark must be positioned in the center of one end seal. These requirements are met. Therefore, there is a problem in that the control of the above-mentioned packaging machine becomes extremely complicated.

On the other hand, in the packaging machine described in item (2) above, the operation of the device that feeds the packaged object and the operation of the device that cuts the end sheet are controlled based on the operation of the device that pulls out the strip-shaped film. Since the machine also has to satisfy the above requirements (a) to C), there is also the problem that the control becomes complicated.

In any of the above packaging machines, aligning the packaged items, the end seal position, and the cut mark position to a predetermined positional relationship is achieved by controlling a single motor that performs the end seal in a fixed position and drives the end sealer. This is due to the point that the user is trying to cut, and this causes a delay in control and misalignment of the end seal and cut mark.

(c) Problems to be solved by the present invention The problems to be solved by the present invention are to change the position of the end seal device along the feeding direction of the packaging film in pillow packaging, and to rotate the horizontal seal bar of the end seal device. The object of the present invention is to prevent the occurrence of misalignment of the end seal with respect to the packaged object by separately controlling the end seal device and the movement of the end seal device.

(d) Means for Solving the Problems One of the inventions of the present application is to form a band-shaped packaging film into a cylindrical shape using a bag-making machine, and feed the article to be packaged into the cylindrical packaging film using a feeding device. In an end seal positioning method for a pillow packaging machine, in which both edges of the packaging film are vertically sealed with a vertical sealing device, and then the packaging film is end-sealed with a horizontal sealing bar of an end sealing device before and after the packaged object. A signal generated based on the operation of the feeding device or the feeding operation of the packaging film feeding device to control a moving motor for moving the end sealing device by changing the position of the sealing device along the feeding direction of the packaging film. The moving motor is operated just before the packaged object reaches the end sealing position, and the seal bar of the end sealing device has a circumferential speed that is the same as the feeding speed of the packaging film during the sealing operation, and a During sealing, it is configured to rapidly advance to the sealing operation start position and stand by at the sealing operation start position.

Another invention of the present application is to form a band-shaped packaging film into a cylindrical shape using a bag-making machine, feed the article to be packaged into the cylindrical packaging film using a feeding device, and vertically seal both side edges of the packaging film. In the end seal positioning device of the bellows packaging machine, in which the packaging film is end-sealed before and after the packaging film with the horizontal seal bar of the end sealing device after vertical sealing with An origin sensor and a seal position setting sensor are provided that generate signals in connection with the operation, and the end seal device is movable along the feeding direction of the packaging film, and the movement of the end seal device is controlled from the seal position setting sensor. The horizontal seal bar is controlled by a moving motor based on a signal from the moving motor, and the horizontal seal bar is operated by a sealing motor separate from the moving motor, so that the horizontal seal bar can be moved rapidly during non-sealing operation, and the sealing The motor is configured to operate based on a signal from the origin sensor.

(E) Effect In the above configuration, prior to starting the operation of the packaging machine, the end seal position is preset by moving the moving motor of the end seal device based on the detection signal of the seal position setting sensor of the feeding device. Further, while the packaging machine is in operation, the end seal position is finely adjusted by moving the position motor based on the detection signal of the seal position setting sensor. Furthermore, the operation of the sealing motor of the end sealing device is controlled based on the detection signal of the origin sensor of the feeding device. This makes it easier to control the end seal position in the raw packaging machine.

(fart)! l! Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, an embodiment of a billow packaging machine equipped with an end seal positioning device of the present invention is schematically shown. The billow packaging machine (hereinafter simply referred to as a packaging machine) 1 of this embodiment is roughly divided into a supply conveyor 2 that supplies a packaged article m.
, a feeding device 3 that feeds out the packaging film f, a bag making device 4 that forms the packaging film fed out by the feeding device 3 into a bag shape, and a feeding conveyor into the packaging film formed into the bag shape by the bag making device 4. 2, a vertical sealing device 6 that is provided downstream of the bag making device 4 and adhesively seals both edges of the packaging film, and a downstream of the bag making device 4. It includes a feed conveyor 7 provided on the side and an end seal device 8, which are arranged in a positional relationship as schematically shown in FIG.

The supply conveyor 2 is a conveyor of a known structure in which the packaged items m are conveyed by a feed pawl 24 attached to a chain 23 suspended between a drive sprocket 22 driven by a drive motor 21 and an idle sprocket (not shown). A detection plate 25 is attached to the driving sprocket so as to rotate at the same time, and a sensor 26 detects a detection mark attached to the detection plate 25.

The mark on this detection plate 25 cooperates with the feed claw of the conveyor,
By detecting the mark with the sensor 26, it is detected that the object to be packaged has been fed to a predetermined position by the feeding claw.

The supply conveyor 2 is also provided with a sensor 27 that detects the presence or absence of an object to be packaged on the conveyor.

The feeding device 3 feeds out the packaging film f toward the bag making machine 4 by cooperating with a feeding roller 32 driven by a feeding servo motor 31 and a pressing roller 33 that presses the packaging film f against the feeding roller. It looks like this. A detection plate 34 is attached coaxially with the feeding roller, and a sensor 35 detects marks made on the detection plate. The feeding device 3 is further provided with a sensor 36 for detecting a register mark M attached to the packaging film f.

The bag making device 4 is a hollow box-like body of a known structure that folds the packaging film f into a bag shape while transporting it, and receives the object to be packaged m therein.

The feeding device 5 includes a pusher 53 that is rotated by a feeding servo motor 51 via a transmission mechanism 52 . This bushing 53 has an arm shape extending l in the radial direction. A detection plate 54 is coaxially fixed to the rotating shaft of the feed motor 51, and an origin sensor 55 can detect an origin mark attached to the detection plate and generate a detection signal.

Another detection plate 56 is attached to the glaze of the transmission mechanism 52,
The mark attached to the detection plate is transferred to another position setting sensor 57.
can be detected and generate a detection signal. This feeding device 5 is configured to push the rear end (as viewed in the direction of travel) of the object to be packaged, which has been fed close to the bag making machine 4 by the supply conveyor 2, with a pusher 53 and feeding it into the bag making machine. .

Then, the object to be packaged m is placed into the bag making device 4 by the pusher 53.
A position setting sensor 57 detects a mark on the detection plate 56 at a certain point during the feeding operation or when the feeding is completed, and a detection signal is generated.

The vertical sealing device 6 includes a plurality of pairs of feed rollers 61, 62 driven by the feeding motor 31 of the feeding device 3, and a pair of vertical sealers 63 arranged between the rollers. It is of a known structure in which both side edges of the packaging film f formed in the above are sandwiched and pressure-sealed.

Note that this vertical sealing device is ## described in the above patent publication.
It may be made of IF. Note that the vertical sealer 63 has a shape of 12 so that it can be moved along the packaging film feeding direction I.

As shown in detail in FIG. 2, the end seal device 8 includes a fixed base 81, a movable housing 83 movably guided by a guide rail 811 on the fixed base, and a packaging film f mounted on the housing 83. A pair of lateral sealers 84 and 84a are provided, which are rotatably mounted substantially perpendicularly to the feeding direction and parallel to each other.

The transverse sealers 84 and 84a are caused to rotate simultaneously in opposite directions and at the same speed by gears 85 and 85a attached to them and meshing with each other. A screw shaft 82 is rotatably attached to the fixed base 81 in parallel with the guide rail 811, and the screw shaft 82 is rotated by a moving motor 86. The screw shaft 82 is screwed into a screw hole formed in a block 831 that is attached to the lower side of the housing 83 and extends toward the fixed base, so that rotation of the screw shaft causes the housing a3t to move along the guide rail. It is designed to move in the direction aa[.

A portion 841 of the horizontal seal par g4 extending outside the -NAlt housing δ3 is connected to a servo motor 87 through a known interlocking mechanism 88 consisting of a toothed belt wheel and a toothed belt, and is rotated by the servo motor. It is now possible to do so. Horizontal seal par 84 (1) N4m8
411Z has a detection plate 9o fixed thereon, and a sensor 91 detects a detection mark attached to the detection plate J. This sensor 91 is used to generate a signal for controlling the stop position of the servo motor 87 based on the signal from the origin sensor 55 of the feeding device 5 in order to keep the starting position of the servo motor 87 constant.

As shown in FIG. 3, each of the horizontal sealers 84 and 84a is formed with a convex portion 842 extending over the entire width of the packaging film f and extending in the radial direction. The outer peripheral surface of the convex portion 842 is a curved surface, and the packaging film is pressed and heat-sealed by the outer peripheral surface. Further, a cutter 845 is attached to the center of the outer peripheral surface of one horizontal sealer 84a and extends across the entire width of the packaging film, and the cutter 845 is attached to the outer peripheral surface of the other horizontal sealer 84.
A groove 846 for receiving 45 is formed. Although not shown, a heater is built into the protrusion 716842 so that the protrusion can be heated.

In this machine tool device, the servo motor 87 is
The seal par 84 and the convex 5842 of δ4a are the third
While moving in the directions of arrows 2 and 2' from the seal start positions A-A and A'-A' to the seal end positions B-B and B'-B' in the figure, the peripheral speed of the outer peripheral surface of the convex portion is It is rotated at the same speed as the film and so as to rapidly feed when returning from the sealing end position to the sealing start position. When the convex portion is at the sealing start position, the servo motor is stopped and the sealer is on standby, based on the origin signal sent from the origin sensor 55 to the control device (not shown) of the packaging machine metal body. The operation start command is sent from the control device to the servo motor 87.
When the servo motor is sent to the side sealer 8, the servo motor rotates and
4.84 Perform the end seal in step a. The time delay in sending the operation start command to the servo motor is approximately the same as the time delay in starting the operation of the moving motor 86 of the end seal device, which will be described later. The operation start command is sent to the servo motor 87 when the end seal position for the corresponding packaged object reaches the seal start position.

Next, the operation of the apparatus of the present invention will be explained in relation to the operation of the pillow packaging machine as a whole.

First, the horizontal sealing position is determined based on the values calculated from the length l and height h of the object to be packaged, with the pusher 53 of the feeding device 5 being the reference (butcher 53j = inside the bag making machine 4). The position measured along the transport direction of the packaging film from the bushing at a certain point in time during the feeding operation of the packaged object or at the time when feeding is completed is determined. Based on the determination, the control device (not shown) of the entire device rotates the moving motor 86 of the end seal device 8 by a predetermined amount to rotate the screw shaft 82, thereby moving the housing 83 of the end seal device and thereby the lateral seal member. 84 and 84a
Move it to the set position. Further, the packaging film f is manually pulled out and set in advance to the position of the vertical sealing device.

When the bellows packaging machine starts operating under such conditions, the motor 21 operates and the supply conveyor 2 supplies the object m to be packaged toward the bag making machine 4 .

When the object m to be packaged is fed to a predetermined position, the servo motor 51 of the feeding device 5 operates (this detects the mark on the detection plate 25 by the sensor 26 and operates based on the detection signal), and the transmission mechanism A bushing 53 is rotated via the bushing 52, and the bushing 53 sends the object m to be packaged into a bag-shaped packaging film f in the bag making device 4. On the other hand, when the servo motor 51 rotates and the detection plate 54 rotates, and the origin sensor 55 detects the mark attached to the detection plate and sends a detection signal to the control device, the feeding device 3 The servo motor 31 of the end seal device 8 and the servo motor 87 of the end seal device 8 start operating. In this case, the servo motor 31 is started to operate by the control device as soon as the detection signal from the origin sensor is sent to the control device, but the servo motor 87 stores the detection signal from the origin sensor in the control device and detects it. When the packaged object m associated with the signal reaches a predetermined position immediately in front of the end seal device (this is determined by calculating the amount of feeding of the packaging film), an operation start command is sent from the control device. The reason why such a time delay is provided is that there is a vertical sealing device 6 between the bag making device 4 and the end sealing device 8, and they are separated from each other, so when the set time detection signal is issued, This is because there is a time delay because there are a plurality of other objects to be packaged before the sent object to be packaged. Note that this set time detection signal is generated for each object to be packaged, sent to the control device, and stored within the control device.

Since the feed roller 61 feed 62 of the vertical sealing device 6 is interlocked with the feed roller 32 of the feed device 3 via the interlocking mechanism 65, it starts operating at the same time as the servo motor 31 starts operating, and moves the packaging film f along the arrow The packaging film is fed in the same direction as the speed at which the packaging film is fed out by the feeding roller 32. Therefore, when the object to be packaged is fed into the packaging film f by the pusher 53, the packaging film is also being fed. Moreover, this feed-out speed is set as one cycle from when the bushing 53 returns from its origin to the next origin, and is set to be the same as the speed at which the material m to be packaged is fed by the bushing 53. , there is no relative speed between the packaging film and the packaged item during feeding of the packaged item. When the objects to be packaged m are sent from the supply conveyor 2 at predetermined intervals, the servo motor 51 of the feeding device 5 rotates and controls the servo motor 31 of the feeding device 3 and the servo motor of the end seal device 8. 87 continues to operate.

On the other hand, when the pusher 53 begins to rotate due to the start of the operation of the feeding device 5, the seal position setting sensor 57 detects the mark on the detection plate 56 to detect the set time, and sends the set time detection signal to the control device. Then, the control device memorizes the set time detection signal, and when the packaged object m sent in when the set time detection signal is output comes just before the end seal device 8 (as described above, the bag making process is started). Vessel 4
There is a vertical sealing device 6 between the end sealing device 8 and the end sealing device 8, and since they are separated from each other, there are a plurality of other packages in front of the packaged product sent in when the set time detection signal is issued. Therefore, the control device operates the moving motor 86 of the end sealing device to move the housing 83 and end seal the packaging film at an appropriate position relative to the object to be packaged. And cut. This makes it possible to appropriately control the end seal position and cutting position for each side of the packaged object. Note that this set time detection signal is also generated for each object to be packaged, sent to the control device, and stored within the control device.

After the packaged item m is fed into the packaging film f in the bag making machine 4, the packaged item is sent along with the packaging film onto the feed conveyor 7 in the direction of the arrow Y, and is sent to the vertical sealing device. After being vertically sealed by a seal bar 63 of No. 6 in a known manner, it is sent to the end sealing device 8. When the object to be packaged (m) arrives in front of the end sealing device in a bag-shaped packaging film, the moving motor 86 of the end sealing device is rotated by the control device to move the housing 83 as described above. The end seal is sent to the most appropriate end seal position for the packaged item, and the end seal position is finely adjusted.

The servo motor 87 of the end seal device 8 is connected to the origin sensor 5
Based on the origin signal sent from 5 to the control device, the control device starts the operation at a different time. That is, when the convex portions 842 of the horizontal seal bars 84 and 84a are waiting in a state facing the sealing start position and a command to start the operation of the servo motor 87 is sent from the control device (at this time, the end sealing target is When the end seal position with respect to the package reaches the position where it matches the seal start position), the servo motor 87 starts operating and the convex portions 84 of the pair of seal bars
The packaging film is crimped and sealed on the outer circumferential surface of No. 2 and cut with a cutter 845.

The above series of operations is performed while checking the pitch between adjacent register marks M attached to the packaging film f as follows. That is, the register mark pitch is determined from the time it takes for the register mark M to pass the position of the sensor 36 of the feeding device 3, and is compared with a preset register mark pitch to determine its length. Then, index t: When the difference between the register mark pitch and the set register mark pitch is within a certain small range, the above operation is continued as is, but when the difference between them exceeds a certain value, the following The rotation of the servo motor 31 is controlled so as to perform mark alignment by changing the feed amount of the packaging film. Also, based on the determination, the feeding device 5
The rotation of the servo motor 51 is also controlled to control the feeding of the packaged item so that the packaged item is positioned between adjacent register marks on the packaging film. Furthermore, based on the determination, the horizontal sealers 84 and 8 of the end seal device 8 are
The rotation of the servo motor 87 is also controlled so that the circumferential speed of the outer circumferential surface of the convex portion 4a during the sealing operation is changed in accordance with the change in the feeding of the packaging film described above.

(g) Effects According to the present invention, two separate servo motors for positioning the end seal position and the end seal device are used to control the rotation of the horizontal seal bar and to control the position of the horizontal seal bar. It's easy to do. Moreover, the article to be packaged can be placed in the center of the end seal positions at both ends, making it possible to obtain a pillow package with a good appearance.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a pillow packaging machine that performs end seal positioning according to the present invention, Fig. 2 is an enlarged perspective view of the end seal device of the pillow packaging machine shown in Fig. 1, and Fig. 3 is a horizontal seal bar FIG. 1: Pillow packaging machine 2: Supply conveyor 3: Feeding device 31: Servo motor 34 Second detection plate 35: Sensor 4: Bag making machine 5: Feeding device 51: Servo motor 53: Pusher 54: Detection plate
55: Origin sensor 56: Detection plate 57
: Position setting sensor 6: Vertical seal device 8: End seal device 82: Screw shaft 83: Housing 84.84a
:Horizontal seal bar 86:Movement motor 87:Servo motor 90:Detection plate 91:Sensor

Claims (1)

[Claims] 1. A band-shaped packaging film is formed into a cylindrical shape using a bag-making machine, an article to be packaged is fed into the cylindrical packaging film using a feeding device, and both edges of the packaging film are vertically sealed. In a method for positioning an end seal in a pillow packaging machine, in which the packaging film is end-sealed with a horizontal seal bar of an end-sealing device before and after the packaged object is vertically sealed by the device, the end-sealing device is moved in the direction in which the packaging film is fed A moving motor that moves the end sealing device by changing its position along the line is operated by a signal generated based on the operation of the feeding device or the feeding operation of the packaging film feeding device, so that the end sealing device can be moved by moving the end sealing device. The moving motor is operated just before reaching the sealing position, and the seal bar of the end seal device has a circumferential speed that is the same as the feeding speed of the packaging film during the sealing operation, and rapidly moves to the sealing operation start position during the non-sealing operation. A method for positioning an end seal in a pillow packaging machine, characterized in that the end seal is placed on standby at the sealing operation start position. 2. Form a band-shaped packaging film into a cylindrical shape using a bag-making machine, feed the item to be packaged into the cylindrical packaging film using a feeding device, and vertically seal both edges of the packaging film using a vertical sealing device. In an end seal positioning device for a pillow packaging machine that end-seals the packaging film before and after the object to be packaged with a horizontal seal bar of an end seal device, the feeding device has a device that is connected to the feeding operation of the object to be packaged. An origin sensor and a seal position setting sensor that generate signals are provided, the end seal device is movable along the feeding direction of the packaging film, and the end seal device is moved based on the signal from the seal position setting sensor. The horizontal seal bar is controlled by a moving motor, and the horizontal seal bar is operated by a sealing motor separate from the moving motor, so that the horizontal seal bar can be moved rapidly during non-sealing operation, and the operation of the sealing motor is controlled. An end seal positioning device for a pillow packaging machine, characterized in that it is configured to operate based on a signal from the origin sensor.