JPS63232107A - Packaging method and device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides various block-shaped frozen foods and snack foods to be processed using film-shaped sheets such as polyethylene.
Conflict-,! This article relates to a packaging method and a packaging device for seven small gods.

(Prior Art) Today, a transaction format in which products are weighed by a set weight, packaged using continuous packaging means, and distributed is becoming popular. A variety of packaging devices have been developed for this purpose, but the combination of a cylinder that supplies the object to be packaged and a molding fitting that forms the packaging material into a cylindrical shape BACKGROUND OF THE INVENTION Vertical type pie and row packaging machines are efficiently preferred for continuously packaging weighed products, and are widely used.

In this vertical pillow packaging machine, a film-like sheet is continuously fed from a sheet roll, and the contents are filled during or immediately after forming a cylindrical sheet into a bag.
Since the bags are sealed by heat-pressure sealing and separated into individual bags, it is possible to automate bagging work for a wide range of products such as solid bulk materials, powders, granules, liquids, and sticky materials. Can be done. The performance of this type of packaging machine is determined by the accuracy with which the timing can be adjusted when various mechanisms such as the feeding mechanism for packaging material from sheet rolls, the sealing mechanism, and the cutting mechanism are continuously driven. It depends on whether you can do it well or not.

(Problem to be Solved by the Invention) In the drive mechanism of such a conventional packaging device, a sealing device simultaneously seals a predetermined length in the width direction of the top of the bag and the sealed portion that will become the bottom of the next bag. The intermittent drive system uses an intermittent drive system that cuts the center of the cylindrical sheet, and the sealing device itself that seals the cylindrical sheet in the width direction is fixed without moving up and down. There is a rotary drive method that is used to transmit the data. In the former method, since the hot plate directly grabs the sheet and pulls it out from the sheet roll, depending on the material of the sheet, cutting accidents may occur and continuous packaging operations may be interrupted.

On the other hand, although the latter rotational drive method eliminates the disadvantages of the former, the feeding of the sheet is stopped for the time required to seal the bag in the width direction, which limits the coloring efficiency.

The purpose of the present invention is to provide a packaging method that solves the problems of the prior art, and to interrupt the packaging process by continuously burying sheets in a series of packaging processes using a plurality of servos. The aim is to provide a packaging device that can be realized efficiently without any problems.

(Means for Solving the Problems) According to the present invention, the first step is to feed a sheet from a sheet roll at a predetermined feeding speed, and the fed sheets are joined together at both sides to form a cylindrical sheet. a second step of sealing the joint in the longitudinal direction of the cylindrical sheet and inserting the article to be packaged therein; and a third step of moving the transverse sealing device in synchronization with the speed of the sheet. A fourth step is to seal the joined cylindrical sheet by a predetermined length in the width direction and cut it from the center part of the sealed part, and to cut the cylindrical sheet with the ends widthwise sealed. against the fourth
and a fifth step of returning the horizontal sealing device to a position corresponding to the vertical width of the bag, which is set to repeat the step, and an invention of this packaging method. In a packaging device that is used directly for carrying out the above-mentioned method, a cylindrical sheet is formed from a film-like sheet roll into a cylindrical shape, and an article placed therein is hermetically packaged. A first servo motor that feeds out at a predetermined speed, a vertical sealing device that seals the longitudinal joint while operating in synchronization with the first servo motor, and a vertical sealing device that seals and cuts the cylindrical sheet in the horizontal direction. It is possible to provide a packaging device characterized by comprising a horizontal sealing device that moves the horizontal sealing device at a constant speed in the feeding direction of the cylindrical sheet.

(Function) In the present invention, the longitudinal joint portion of the cylindrical sheet is sealed, and the lateral sealing device is moved at the same speed as the cylindrical sheet to seal and cut the lateral direction, and then the lateral sealing device Packaging is performed through a series of steps in which the bag returns to its initial position according to the vertical width of the bag, and by accurately controlling the timing of the servo motor, the packaging process is stopped for individually weighed and supplied products. It can be efficiently sealed and packaged in a bag without any hassle.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a perspective view schematically showing an example of a packaging device that continuously processes products weighed by set weight in flexible polyethylene bags, and Fig. FIG. 3 is a diagram for further schematically explaining the sheet processing process.

The packaging device 1 is connected to a polymerization hopper of a combination weighing device (not shown) via a cone-shaped chute 3 provided at the top of a frame 2, and includes a power source, a control device 4, and a computer 5. At the rear, a polyethylene film-like sheet roll 6 of a predetermined size is provided in a replaceable manner, and the sheet 7 pulled out from the roll is delivered to a predetermined combination and weighed sheet that is discharged from above through a shade 3 in a preset cycle. In order to accommodate a heavy article 8, it is formed into a cylindrical sheet 10 by a former 9.

A feeding device 11 for the cylindrical sheet 10 is arranged a predetermined distance below the vertical sealing device 12, and is connected to the cylindrical sheet 10 at a predetermined pressure from a first servo motor 13 via a shaft, a transmission belt, a link mechanism, etc. The vertical sealing device 12 is moved at a speed that is synchronized with the vertical speed, and the vertical joint portion of the cylindrical sheet 10 is sealed by the sealing mechanism having a thermal welding action. ing. This vertical sealing operation is repeated by the box motion of the vertical sealing device 12 corresponding to the sealable length of the sealing mechanism, thereby continuously forming bags in which the longitudinal direction of the cylindrical sheet 10 is sealed. be done.

The horizontal sealing device 14 includes a sealing mechanism that sandwiches the vertically sealed cylindrical sheet 10 from the front and back and thermally welds it by a predetermined length in the width direction using heat from a heater inserted therein, and a central portion in the width direction. It has a cutter for cutting the cylindrical sheet 10 from the sheet. Further, this structure sealing device 14 is driven by a third servo motor 1 that drives the sealing mechanism and the cutter.
5, which together form a second servo motor 16.
The cylindrical sheet 10 is moved at a constant speed in the vertical direction, that is, in the feeding direction of the cylindrical sheet 10, by the elevating parr 17, which moves up and down by converting the rotational force of the cylindrical sheet 10.

As will be described in detail later, the horizontal sealing mechanism 14 is returned at a predetermined timing to a position corresponding to the vertical width of a bag 18 of a predetermined size in which the article 8 is sealed. This movement is a so-called box motion.

Based on FIG. 2, the three servo motors 13,
The process control from the sheet roll 6 to the packaging of the article according to 15.16 will be explained.

The first servo motor 13 is an AC servo motor that feeds the sheet 7 from the sheet roll 6 at a constant speed.

The sheet 7 is accurately positioned and supplied from the pinch roller 19 to the former 9 by a sheet tracking motor 20 that controls and tracks the sheet roll 6 in the axial direction. And cylindrical sheet 1
A vertical sealing device 12 equipped with a heater for vertical sealing seals the sheet formed into a cylindrical shape at the joint portions on both sides thereof. While descending at a speed synchronized with the servo motor 13, the sheet is cylindrical in a predetermined cycle. It is processed into

Further, the second servo motor 16 is an AC servo motor for lowering the horizontal sealing device 14 in synchronization with the sheet feeding speed, and the horizontal sealing device 14 seals and cuts the cylindrical sheet 10 in the horizontal direction. It is lowered at the same speed as the sheet feeding speed for a period of time, then raised along the rack 17 for lifting/lowering control with a predetermined lifting stroke, and returned to the position corresponding to the upper end of the bag 18 in the next cycle. ing. The horizontal sealing heater and knife unit provided in the horizontal sealing device 14 are operated by the third servo motor 15.
Articles inputted from the weighing device 21 and bags I to be described in detail later.
It is driven to open and close at a predetermined timing with an opening and closing stroke according to the set width of B. Note that the rising speed v1 of the horizontal sealing device 14 is greater than the descending speed v2, which will be detailed later (
Vl>v2), forming a quick return cycle.

22 is a dancer bar, which adjusts the tension of the sheet 7. Further, a sensor 23 for detecting an eye mark and a printer 24 are arranged close to the sheet 7. The eye mark is
It forms a reference signal for the position at which the bag 18 is closed and cut by the horizontal sealing device 14, and also by the printer 2.
4, the manufacturing date and the like are imprinted at a predetermined position on the sheet 7. Furthermore, a vibrator is required when the article 8 that is inserted while sealing the joint in the longitudinal direction by the vertical sealing device 12 is sticky, for example.
Also provided are an accelerator 25 for accelerating the falling speed of the article 8 from the weighing device 21, an air pressure generator 26 connected to the vertical and horizontal sealing devices 12, 14, and the like.

FIG. 3 is a block diagram showing an example of a controller that controls the packaging device 1 including the packaging process configured as described above.
A controller unit 30 that controls the sheet feeding timing including three servo motors 13 and 15° 16, and a bag i8
It is comprised of a sequencer section 31 that performs sequence control of heaters that perform vertical and horizontal sealing.

The controller unit 30 has a control panel 34, and is configured to be connectable to a program loader 32, a teaching pendant 33, etc. via the control panel 34. In other words, setting data is input to the controller 35 composed of a CPU board, and while controlling the weighing operation in the weighing device 21, the position and speed of the servo motors 13, 15, and 16 are transmitted via AC servo drivers 361, 362, and 363, respectively. It also receives and receives information 37 from limit switches such as the horizontal seal device 14 and the dancer bar 22.
Accelerator 25, printer 24, and horizontal sealing device 1
It is connected to the knife drive unit 141 of No. 4 and controls their drive timing.

In the sequencer section 31, heater H1 for vertical sealing, heater H2 for horizontal sealing, )! 3, on/off control of the motor 20 for sheet tracking, pressure control for pressing from the air pressure generator 26, on/off control of the accelerator 25, etc. Man for that purpose
As a machine interface, heater 81. H2,H
3, a graphic programmer 40, a mini programmer 41, etc., which display and change the control sequence of the sequencer 39, and monitor the operating status thereof. is configured to be connectable to the sequencer section 31.

Next, the manufacturing process in the packaging apparatus 1 having the above configuration will be explained with reference to the flow of the apparatus operating procedure shown in FIG. 4 and the basic flow of mode setting operation shown in FIG.

First, in step a, turn on the power to the sequencer section 31,
Next, in step b, the controller unit 30 is powered on. In step C, the controller panel 34 servo
Press the on button to turn on the servo motors 13, 15, 16. If the controller unit 30 does not know the stop position of each servo motor 13, 15, 16 at the time when the power is turned on, a return-to-origin operation is normally performed at this point. This return to origin in step d is performed by M3.
This is done in the order of Ml and Ml.

The servo motor 15, that is, M3, has an origin set based on the origin position detected by a limit switch etc. when the horizontal seal device 14, which opens and closes with a cylindrical sheet in between, is operated in the closing direction. The position is called the ready position of the transverse sealing device.

The origin of the servo motor 16, that is, Ml, is set based on the motor phase when the horizontal sealing device 14, which has risen in the opposite direction to the eighth shift of the cylindrical sheet, reaches the origin position detected by a limit switch or the like.

The servo motor 13, that is, Ml, rotates the vertical sealing device 12 in the normal rotation with the moving direction of the cylindrical sheet being the normal rotation direction.
The origin is set based on the motor phase when the motor reaches the origin position detected by a limit switch or the like. The controller 35 stores the operating conditions, and if necessary in step e, moves to step f for manual operation in line 8 to change the set value of the operating conditions.

This manual operation is executed by selecting the manual mode, which will be explained later.The conditions that can be changed and set at this time are the production speed indicated by the number of bags produced per minute, the production speed indicated by the number of bags produced per minute, The vertical width, the same horizontal width, the distance from the eye mark to the cutting position of the sheet, the drive of the horizontal sealing device, that is, the measuring device prior to the timing of sealing the cylindrical sheet by a predetermined length in the width direction. 21 to output a dump request signal requesting the input of the article, and the distance from the eye mark to the position where the printer 24 prints. Note that if the eye mark is not used, it is also possible to perform seek processing using a preset bag length. Furthermore, in the sequencer section 31, the heater H1
, H2, 83 temperature control target values, pressing air pressure control target values, etc. When changing and setting the operating conditions, it is possible to switch to manual mode, manually move each part of the packaging device 1 as necessary, and check the operation.

In step g, the semi-automatic mode is selected and a trial run is performed. This test run is a step of making an empty bag and checking the quality of the bag before actually bagging the weighed items, and this is performed as necessary.

In step h, the automatic mode is selected, and the actually weighed articles are placed in a bag and packaging work is performed. The settings in the controller section 3o and sequencer section 31 can be changed during operation, but when operating under the changed conditions, the cycle must be stopped once until the scheduled number of packages have been completed, or When stopping for other reasons, first the servo drivers 361 to 36
3 is turned off, and then the controller section 30 and the sequencer section 31 are turned off (steps i to k).

When executing the main functions of the controller section 30, an appropriate mode must be selected.
Here, basic operations will be explained according to the mode flow shown in FIG.

When the power is turned on, the controller unit 30 enters manual mode, and manual operation becomes possible. At this time, since the controller unit 30 does not know the position of each servo motor, it is necessary to select the origin return mode and search for the origin position for each axis. After the return to the origin is completed, the manual mode is selected to perform fine adjustment of the mechanical part of the packaging apparatus, for example, the sheet position. Edit mode is a mode for setting and changing operating conditions during automatic operation, and as mentioned above, similar mode selections are also possible from automatic mode. The automatic mode includes an automatic mode and a semi-automatic mode, and when an abnormality occurs during driving, the manual mode is selected and the cause is removed by manual operation.

FIGS. 6(b) to 6(d) show the operation patterns of each servo motor Ml, M2, and M3 during automatic operation, and the timing relationship with the external input/output signals of the controller will be explained next. .

In the same figure (a), when the sensor 23 detects the eye mark on the sheet, a detection signal is sent, and the timing Txl, T defined by the sheet feeding speed by the servo motor Ml is reached.
The horizontal sealing device 14 and printer 24 operate according to x2. Xl and X2 are calculated as the length of the seat based on the values set as operating conditions and the acceleration/deceleration parameters of each motor.

The horizontal sealing device 14 starts descending from its origin position after T x 1 has elapsed after the eye mark is detected, continues descending for a predetermined time at the same speed as the sheet feed speed, completes the horizontal sealing process, and then stops. It has a cycle in which it moves up, then returns to the origin position. In this cycle, a predetermined time elapses after the horizontal sealing device 14 reaches the sheet feeding speed.
Servo motor M3 is used to close the sealing mechanism and knife.
is controlled, and just before the horizontal sealing device 14 starts decelerating, the sealing mechanism and the knife are opened by the servo motor M3 to the position where the width specified by the width of the bag is reached, and the horizontal sealing device 14 is opened to the cylindrical sheet. and start to rise relatively.

Figure (f) shows the dump request output for the weighed articles, which is controlled so that the articles fall to the bag at the timing when the horizontal sealing device 14 closes in the next cycle, and the dump preparation completion input for that cycle. It is output after confirmation. If there is no dump ready input, the system exits automatic mode and stops.

FIG. 4(h) shows the timing of quantity control of the vertical sealing device 12. If the vertical seal device 12 is in the closed state when the machine is stopped, the sheet will burn out, so it is returned to its origin at the timing of opening, and here the vertical seal device 12 is returned to its origin position. Servo motor M
1, the longitudinal joints of the cylindrical sheet are continuously sealed to form a bag by a box motion that is mechanically interlocked with the box motion.

FIG. 6(j) shows the printer command output for printing the date and the like on the bag. This is eye mark detection,
If the printer ready input is on when the sheet is fed x2 by the servo motor from then on, it will be output. Note that if a printer command cannot be output twice in a row during automatic operation, the cycle is stopped.

In this manner, in the packaging apparatus of the present invention, the three servo motors Ml, M2, and M3 are controlled at appropriate timings to continuously form bags in accordance with the feeding speed of the sheet formed into a cylindrical shape. The sealing mechanism, which performs vertical and horizontal sealing using these servo motors, can be controlled in accordance with the precisely set bag size without interrupting the packaging process. In addition, the sealing time can be determined independently of the bag size setting and the type of goods being packaged, and by setting the timing appropriately according to the material of the sheet, reliable packaging is possible. Become.

Although this invention has been described in some detail with respect to its most preferred embodiment, the description of the preferred embodiment does not include modifications in the detailed parts of the structure unless they are contrary to the spirit of the invention as described in the claims. It is clear that various modifications or combinations of these can be made.

(Effects of the Invention) As explained above, according to the packaging method of the present invention, precise automatic operation is possible without stopping the sheet by controlling the timing of each mechanical part with a servo motor, and the packaging method for this purpose To provide an efficient packaging device, and also to provide a versatile packaging device without damaging bags or their contents during continuous manufacturing.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing a packaging device according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing an outline of the sheet processing process controlled by a servo motor, and FIG. 3 is a diagram showing each part of the packaging device. FIG. 4 is a block diagram showing the controller that controls the mechanism; FIG. 4 is a flowchart showing the operating procedure in the same embodiment; FIG. 5 is a flowchart showing basic mode setting operations; FIG. 6 is a flowchart showing the continuous operation. FIG. 3 is a diagram showing the timing of one cycle of time. 1... Packaging device, 7... Sheet, 8... Article, 1
1... Feeding device, 12... Vertical sealing device, 13...
・First servo motor, 14... Lateral seal device, 15
...Third servo motor, 16...Second servo motor.

Claims (3)

[Claims] (1) A first step of feeding a sheet from a sheet roll at a predetermined feeding speed, a second step of joining the fed sheets to each other on both sides to form a cylindrical sheet, and a second step of forming a cylindrical sheet. a third step of sealing the joint in the longitudinal direction and inserting the article to be packaged there; and a third step of sealing the joined part in the longitudinal direction and inserting the article to be packaged therein, and moving the joined cylindrical sheet in a predetermined width direction while moving the horizontal sealing device in synchronization with the speed of the sheet. The fourth step is to seal the length of the sheet and cut it from the center of the sealed portion, and the fourth step is set to be repeated for the cylindrical sheet whose end portion is sealed in the width direction. A packaging method comprising: a fifth step of returning the horizontal sealing device to a position corresponding to the vertical width of the bag. (2) In a packaging device that forms a sheet pulled out from a film-like sheet roll into a cylindrical shape, and seals and packages an article placed therein, the cylindrical sheet is fed out from the sheet roll at a predetermined speed. 1 servo motor, a vertical sealing device that seals a longitudinally jointed portion while operating in synchronization with the first servomotor, and a lateral sealing device that seals and cuts a cylindrical sheet in the lateral direction; A packaging device comprising: a second servo motor that moves the horizontal sealing device at a constant speed in the feeding direction of the cylindrical sheet. (3) The horizontal sealing device includes a third servo motor that repeatedly drives its sealing mechanism and cutting mechanism at predetermined timing in synchronization with the second servo motor to form bags from the cylindrical sheet. The packaging device according to claim 2, characterized in that it has: