JP2673407B2 - Film feeding control method and apparatus for vertical bag-making filling and 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 film feed control method and device in a vertical bag-making filling and packaging machine in which a film is intermittently delivered.

[0002]

2. Description of the Related Art A belt-shaped film fed from an original roll is formed into a tubular shape by a bag making machine, and the tubular film is vertically sealed along the outer periphery of a vertical filling cylinder while being fed vertically. , A product is dropped and supplied to a tubular film through the filling cylinder, and a horizontal seal is provided before and after sandwiching the product of the tubular film according to the timing of intermittent stop after the tubular film is fed for a predetermined length. BACKGROUND ART Vertical bag-making filling and packaging machines that obtain so-called pillow packages by cutting have been widely used in various industrial fields. In this packaging machine, a pair of film feed belts are movably arranged with a filling cylinder sandwiched therebetween, and the feed belts are driven and driven in a predetermined direction by a servomotor or a stepping motor to move along the outer peripheral surface of the filling cylinder. A means for intermittently feeding the guided tubular film downward by a predetermined length is adopted.

As a method for suppressing the slip between the belt and the tubular film or the advance of the film, which occurs when the film feed belt is activated or decelerated at the time of intermittent feeding of the tubular film by the feeding means, for example, JP-A-63-294314 and JP-A-63-1
The invention disclosed in Japanese Patent No. 62412 exists. According to this method, a servo motor or a stepping motor that drives a film feed belt is controlled so as to be gradually increased to the maximum speed at the time of start-up and gradually decelerated from the maximum speed at the time of stop.

[0004]

In the above-described film feeding control method, the film feeding speed at the time of feeding the film is the acceleration value from the start to the maximum speed and the deceleration from the maximum speed to the stop. The value is always held at a fixed value (fixed value), and when the film feed time (cut pitch) or the film feed time is changed due to a change in the packaging speed, the maximum value of the film feed speed is A control method is adopted in which the film feed amount set in advance is fed within a predetermined time by being automatically changed.

Regarding the film to be used, a thick film or a film having a large bag-making width and a thin film or a film having a small bag-making width are strip-shaped films fed from a raw roll at the time of film feeding. The degree of slippage between the feed belt and the film varies due to the difference in bag making resistance when the film is formed into a tubular shape by the bag making device. In addition, the amount of elongation of the film at the time of feeding the film is different between the film that easily causes elongation and the film that hardly causes elongation. As described above, the speed increase value and the deceleration value are always constant when the film feed belt is started and stopped during the film feeding as described above, although the degree of slippage and the amount of elongation are different depending on the characteristics of the film. For those that are controlled by a fixed value, especially when the packaging processing speed is high, or when the film feed amount per hour is large, when the film feeding speed is set to a high speed, the film meanders and is manufactured. Occurrence of bag wrinkles, variation in film feed amount, etc.
There is a problem in that good film cannot be fed.

Therefore, in consideration of the degree of slip between the feed belt and the film due to the bag-making resistance at the time of feeding the film, the elongation amount of the film, etc., the film feeding speed is set to be as low as possible. It is possible to set the maximum speed and film feed time to average values based on empirical values.However, even if such control is performed, film feed under various conditions will always be performed under optimal conditions. Was difficult to do.

Further, even when a plurality of different types of products are packaged together, it is difficult to set the optimum film feeding conditions for each characteristic of the film used or packaging conditions.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed to solve the above problems inherent in the vertical bag-making filling and packaging machine according to the prior art described above. Vertical type bag-filling packaging that enables optimal film feed control according to packaging conditions, etc., and can prevent film meandering, bag-making wrinkles due to defects during film feeding, and variations in packaging length, etc. An object of the present invention is to provide a film feed control method and a device therefor in a machine.

[0009]

In order to overcome the above-mentioned problems and to achieve the intended purpose, a film feed control method for a vertical bag-making filling and packaging machine according to the present invention is manufactured by feeding from a raw roll. A film feeding means for intermittently feeding a film formed into a tubular shape by a bag device starts the feeding of the film.
Hayashi increase until reaches a maximum speed after the start-up at the time, then Fi
In a vertical bag-making filling and packaging machine that is rotationally driven and controlled so as to decelerate from the maximum speed and stop when the feeding of rum is stopped, the film feeding means is started according to the characteristics of the film used or the packaging conditions. the respective acceleration and deceleration values during deceleration and stopping accelerated during, individually set to any value in the input, the
Acceleration / deceleration value set and input and the maximum of the film feeding means
It is characterized in that the film feeding speed is speed-change controlled based on the rotation speed value .

In order to preferably carry out the above-mentioned film feed control method, a film feed control device of a vertical bag-making filling and packaging machine according to another invention of the present application is a bag-making machine which is fed out from an original roll. A film feeding means for intermittently feeding a cylindrically shaped film downward, a servomotor for driving the film feeding means, and an acceleration value from the rotation start of the film feeding means to the maximum speed and a setting input means for inputting data <br/> data each relating to deceleration values in to a stop from maximum speed individually, storage means for storing data input by said setting input means, stored in said storage means Data about acceleration and deceleration
And a control means for performing acceleration / deceleration control of the servo motor based on the maximum rotation speed value of the rum feeding means .

[0011]

The data about the acceleration / deceleration value at the time of starting and stopping regarding the intermittent drive of the film feeding means is input through the setting input means according to the characteristics of the film and various packaging conditions, and the servo motor receives the input data. By controlling the acceleration and deceleration based on the above, the film feeding means intermittently travels and the tubular film is fed downward by a required feeding amount.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a film feed control method and apparatus for a vertical bag-making filling and packaging machine according to the present invention will be described with reference to the accompanying drawings, with reference to preferred embodiments.

As shown in FIG. 1, the film 12 wound on the original fabric roll 10 is delivered by a pair of delivery rollers 14, 14 and directed to a bag making machine 20 via a dancer roller 16 and a number of guide rollers 18. Be delivered. Bag making machine 2
0 is arranged substantially concentrically on the upper part of the filling cylinder 22 arranged upright, and the film 12 is formed into a cylindrical shape by passing through the bag making machine 20. The film 12 formed into a tubular shape runs along the outer periphery of the filling cylinder 22 and is positively moved downward by a pair of film feed belts 24, 24 (only one is shown) that are arranged opposite to each other with the filling cylinder 22 interposed therebetween. Will be delivered. The longitudinal edges of the tubular film 12 that overlap in the longitudinal direction are vertically sealed by a vertical sealer 33 during feeding by the film feed belts 24, 24.

The film feed belt 24 is driven by a servo motor SM controlled by a servo amplifier 26, as shown in FIG. The servo motor SM is provided with a rotary encoder E for detecting a rotational position, and the output thereof is supplied to the servo amplifier 26 and the servo control unit 28. And this servo motor S
As will be described later, M is an operation based on an acceleration value, a deceleration value, and a maximum speed value for intermittently driving the film feed belt 24 that is arbitrarily set according to the characteristics of the film 12 to be used, packaging conditions, and the like. Controlled. The control pattern during acceleration / deceleration is a constant acceleration straight line, or (a) cycloid curve, (b) deformation constant velocity curve, (c) deformation trapezoidal curve,
(D) Based on each cam curve of the modified sine curve, a preprogrammed control pattern can be selected,
The film feed belt 24 with the entered values
Is controlled to rotate at a non-constant speed, and when the cylindrical film 12 is intermittently fed, optimum feeding control is performed according to the film characteristics, packaging conditions and the like. Reference numeral S indicates a registration mark sensor that detects a register mark attached to the film 12, and a detection signal of the sensor S is input to the register unit 34 via the sensor input interface 32.

As shown in FIG. 1, a hopper 38 into which various products 36 are loaded is disposed immediately above the bag making machine 20,
The filling cylinder 22 located below and the axis thereof are aligned. Above the hopper 38, a supply device (not shown) for supplying and dropping the product at predetermined time intervals is provided. Below the filling cylinder 22, a pair of horizontal sealers 40,
40 are arranged to face each other so as to be able to approach and separate from each other, and these lateral sealers 40, 40 are adapted to laterally seal the tubular film 12.

FIG. 2 is a block diagram schematically showing the control circuit 42 of the vertical bag-making filling and packaging machine according to this embodiment.
Data processing calculation unit 44 that performs calculation processing of input data
And a servo control unit 28 for controlling the servo motor SM
And a register section 34 for storing control data relating to the servo motor SM. The operation panel 46 as a setting input means provided in the main body of the packaging machine has a keyboard for inputting various data, a button for instructing start / stop of the packaging machine, and the input data from the keyboard is the operation panel interface 48. It is stored in the register unit 34 via. As input data, numerical data relating to the feed amount and feed time of the tubular film 12 required for one pillow packaging, the film feed belt 24,
24 are acceleration / deceleration values, maximum speed values, and the like during intermittent driving. Further, the operation panel 46 is provided with means for selecting the control pattern at the time of acceleration / deceleration of the servo motor 12 from the uniform acceleration straight line or the cam curves of (a) to (d), and the selected desired control pattern and the above-mentioned The acceleration control pattern is set by the various input data, and is stored in the register unit 34. Further, the signal from the registration mark sensor S of the register mark attached to the film 12 is transferred to the register unit 3 via the sensor input interface 32.
When the input signal is delayed with respect to a preset reference position so that the print pattern of the film 12 is received in response to the input signal, the film feed belts 24, 24 An interrupt signal is input to a predetermined acceleration / deceleration control signal of the servo motor SM for driving the servo motor SM, and the servo motor SM is accelerated / decelerated according to the degree of retardation of the interrupt signal, so that the print pattern of the film 12 is aligned. Is being carried out.

Further, reference numeral 50 indicates a pulse generating means represented by a clock pulse generator, and each operating mechanism of the packaging machine is based on pulses generated at predetermined intervals.
It is set so that (horizontal sealer, etc.) is drive-controlled. The pulse generated by the pulse generating means 50 controls the shift of the position and speed of the servo motor SM that drives the film feed belt 24.

Here, the film feed belts 24, 2
4 regarding the maximum speed value and rotational acceleration / deceleration value that are rotationally driven, the maximum speed with respect to the rotational peripheral speed of the film feed belt 24, the time from the start of the start up to the maximum speed, and the maximum speed. The time until it stops and the feed amount of the film 12 are respectively set on the operation panel 4
Data is set by inputting with the keyboard of No. 6. With these data settings, the film feed time with respect to the set feed amount (cut pitch) of the tubular film 12 is calculated, and the calculated data is stored in the register unit 34. Then, the servo motor SM for driving the film feed belt 24 is pulse-controlled based on the data, so that the film feed belt 24 is rotated in a required acceleration / deceleration pattern when the film feed belt 24 is rotated intermittently and repeatedly. .
Regarding the data settings related to the maximum speed value,
Regarding the acceleration / deceleration value, while inputting the data of the acceleration / deceleration acceleration data, the feed time for the preset film feed amount is set, and the control pattern is calculated by calculating the maximum speed value from the set data. It is also possible to ask.

Further, the above-mentioned setting data can be stored for each of a plurality of types of packaging films 12 having different characteristics, and only when the order is changed at the time of production, the product type is set and the previously set data is set. Is set automatically. Since the packaging film 12 used for the packaging product 36 is set in most cases,
It is also possible to automatically set the data by setting the type of the packaged product 36. For the input of the type setting, a method of inputting an actual type name or inputting a type number previously assigned to each type is adopted.

[0020]

Next, the operation of the vertical bag making and filling machine according to this embodiment will be described.

Prior to the operation of the packaging machine, the operation panel 4
Operate the keyboard of No. 6 to operate the film 12 or the product type name of the film 12 or the packaging product 36, and the film 1
Enter the feed amount of 2. The film feed belt 24,
The acceleration / deceleration value and the maximum speed value for driving 24 are input, and these data are stored in the register unit 34 via the operation panel interface 48. Furthermore, the servo motor SM
Regarding the control pattern at the time of acceleration / deceleration, the optimum one is selected from the four options corresponding to the constant acceleration straight line or the above-mentioned cam curve. The various data set and input by the keyboard and stored in the register unit 34 are arithmetically processed by the arithmetic unit 44 to be processed by the servo control unit 28.
Is input to the servo motor 28 in the servo control unit 28 based on the input data, for example, FIG. 3, FIG. 4, FIG. 5 (example in which constant acceleration straight line is selected), and FIG. 6 (cam curve). An acceleration control pattern for acceleration / deceleration is set as shown in the example (1) is selected and stored in the register unit 34. The film feed amount is (film feed speed)
X (film feed time), which is shown in FIG.
This is shown as an example in which the areas of the hatched portions in FIG. 6 are the same and the film feed amounts are the same.

By operating the start command button of the packaging machine provided on the operation panel 46, the packaging machine outputs a supply OK signal to the supply device and enters a state of waiting for arrival of the product 36. Then, the product 36 is put into the hopper 38 of the packaging machine from the supply device, and when the detection means (not shown) detects this, the servo motor SM for driving the film feed belt 24 is started. That is, the servo control unit 2
The control signal generated from 8 provides a required speed command to the servo motor SM via the servo amplifier 26,
Pulse control is performed based on the acceleration control pattern described above. As a result, the film feed belt 24 is controlled to rotate at a non-constant speed under the optimum conditions for the characteristics of the film 12, the packaging conditions, etc., and the tubular film 12 is reliably fed by the predetermined feed amount within the set time. . Further, it is possible to effectively prevent the occurrence of bag-making wrinkles, the meandering of the film, and the variation of the packaging length due to the slip of the tubular film 12 and the film feed belt 24 during the film feeding or the elongation of the film 12. .

Next, when the type of the film 12 or the product 36 is changed due to the order change, the data relating to the acceleration / deceleration control of the servo motor SM is input by the keyboard of the operation panel 46 to deal with this. The acceleration control pattern is set. For example, FIGS.
FIG. 3 shows each acceleration control pattern with the same film feed amount in the case where a constant acceleration straight line is selected as a control pattern at the time of acceleration / deceleration of the servo motor SM. FIG. 3 shows acceleration / deceleration values. 4 is a graph in which the same ratio is set, and FIG. 4 shows the same feed time as the film feed time of FIG.
FIG. 5 is a graph in which the maximum speed value is set high, and FIG.
5 is a graph in which the speed increase value and the maximum speed value are set smaller than those in FIG. 4 and the feed time is set long.
Further, FIG. 6 is a graph showing an acceleration control pattern when a cam curve is selected as a control pattern during acceleration / deceleration of the servo motor SM. If the type has already been set and stored, the acceleration control pattern of the servo motor SM is automatically set by calling the data,
The loss time required for order change can be greatly reduced.

As described above, in the packaging machine according to the embodiment, the optimum value for the film 12 and the packaging conditions can be set as the acceleration / deceleration value for driving the film feeding belts 24, 24. The original packaging is possible. Therefore, even if it is a film that is elastic, such as a thick packaging film having an aluminum foil layer laminated, which has been difficult to package in the past, and has an extremely high bag-making load, and that wrinkles are produced, Can be packaged. Also, when using an easily stretchable film such as low density polyethylene (LDPE), by setting a small acceleration value at startup (longer time to reach maximum speed),
Packaging can be performed under the condition that elongation does not occur during film feeding, and the types of packaging film that can be used can be increased. Further, even with the same film feed amount (cut pitch), the film feed time can be set to the shortest time as required, and the speed can be increased.

In this embodiment, the case where the film is fed only by the belt as the film feeding means has been exemplified. However, a belt having a vacuum suction means for vacuum-adsorbing the cylindrical film to feed the film may be used as needed. It can be appropriately adopted. A roller can also be used as the film feeding means.

[0026]

As described above, according to the film feeding control method and apparatus for the vertical bag-making filling and packaging machine according to the present invention, the film is intermittently fed depending on the characteristics of the film used and various packaging conditions. Since the speed-up value and the deceleration value at the time of starting and stopping the film feeding means at the time of feeding can be input and set to desired values, optimum film feeding control can be set. Therefore, it is possible to effectively prevent the occurrence of bag wrinkles, the meandering of the film, and the variation of the packaging length due to the slip between the film and the feeding belt during the film feeding or the elongation of the film. Further, even in the case where a plurality of different types of products are combined and used, optimum film feeding conditions can be set according to the characteristics of the film used, the packaging conditions, and the like.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a vertical bag-making filling and packaging machine according to an embodiment for preferably achieving a film feed control method of the vertical bag-making filling and packaging machine according to the present invention.

FIG. 2 is a control block diagram of the vertical bag-making filling and packaging machine according to the embodiment.

FIG. 3 is a graph showing an acceleration control pattern of a servo motor as a relationship between speed and time.

FIG. 4 is a graph showing another acceleration control pattern of the servo motor in terms of the relationship between speed and time.

FIG. 5 is a graph showing another acceleration control pattern of the servo motor in terms of the relationship between speed and time.

FIG. 6 is a graph showing yet another acceleration control pattern of the servo motor as a relationship between speed and time.

[Explanation of symbols]

10 Original roll 12 Cylindrical film 2
0 bag making machine 24 film feed belt (film feed means) 26 servo amplifier (control means) 28 servo control section (control means) 34 register section (storage means) 46 operation panel (setting input means) SM servo motor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-217913 (JP, A) JP-A-63-294314 (JP, A) JP-A-3-176317 (JP, A) Actual development Sho-55- 36112 (JP, U)

Claims (6)

(57) [Claims] 1. A bag-making device (2 ) fed from a raw roll (10).
The film feeding means (24) for intermittently feeding the film (12) formed into a tubular shape in ( 0) opens the feeding of the film (12).
When starting the Hayashi increased until it reaches the maximum speed after startup, then the film (12) feeding a vertical bag filling and packaging to be rotated drive control to stop decelerating from maximum speed when stopping the in machine, the characteristics or husband acceleration and deceleration values in the film feed means (24) for startup acceleration time and deceleration stop depending on the packaging conditions of the film (12) used s, individually set to any value in the input ,
The acceleration / deceleration value input by this setting and the film feeding means (2
A film feed control method for a vertical bag-making filling and packaging machine, characterized in that the feeding speed of the film (12) is controlled based on the maximum rotation speed value of 4) . 2. A bag-making device (2 ) fed from a raw roll (10).
Film feed means (24) for intermittently feeding a film (12) formed in a tubular shape in ( 0) , and a servo motor (SM) for driving the film feed means (24 )
If the the film feed means (24) setting input means for inputting the respective data individually regarding deceleration value at the rotation start until the stop speed increasing value and the maximum speed to reach a maximum speed of (46), wherein Storage means (34) for storing the data input by the setting input means (46), and data relating to the acceleration / deceleration value stored in the storage means (34)
And a film for a vertical bag-making filling and packaging machine, characterized by comprising a control means (28) for performing acceleration / deceleration control of the servomotor (SM) based on the maximum rotation speed value of the film feeding means (24). Feed control device. 3. The control means (28) is the setting input means.
The film feed control device for a vertical bag-making filling and packaging machine according to claim 2, wherein the film feed means (24) is controlled on the basis of the maximum rotation speed value data set and input by the (46) . Wherein said control means (28), said film feeding means by setting input by the setting input unit feeding time for acceleration and deceleration values and film feed amount of (24) (46), said film feed means Calculate the maximum rotation speed value of (24)
The film feed control device for a vertical bag-making filling and packaging machine according to claim 2, further comprising a data calculation processing unit (44) for performing the operation . 5. A control pattern at the time of acceleration / deceleration of the film feeding means (24) is set by selecting from a plurality of types of data corresponding to a uniform acceleration straight line or a cam curve, and stored in the storage means (34). The film feed control device for the vertical bag-making filling and packaging machine according to claim 2. 6. The film feed control of a vertical bag-making filling and packaging machine according to claim 2 or 5, wherein the input data is stored in the storage means (34) as setting data for each type of packaging film (12). apparatus.