JP2000033914A - Method and device for regulating cut position for packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate the cut position without wasting a film by setting the start timing at the position of origin of a horizontal seal member based on the feed of the film until the cut position of the film reaches the cut position from the time when a match mark is detected. SOLUTION: A film feed counter 11 is operated when a match mark sensor 1 detects a match mark m, and the feed of a film f from the match mark position is measured as the pulse number. When the film f passes the cut position B in one operation pattern, a belt drive motor 3 is stopped, and the pulse number corresponding to the feed of the film f up to this point is preset as the reference value to a film feed storage means 12. Then, the movement of horizontal seal jaws 4, 4 from the match mark detection point to the cut position B is calculated based on the reference pulse number inputted as the feed of the film f to calculate the start timing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a method and an apparatus for automatically adjusting a cut position of a film in a packaging machine.

[0002]

2. Description of the Related Art As a technique for determining a cutting position of a bag,
A method of adjusting the time from when the eye mark is attached to the film to when the eye mark is detected to when the film is cut, that is, by checking the amount of shift in the cut position while changing the time set on the timer with a dial etc. The method of adjusting the position of the eye mark sensor and the method of shifting the position of the eye mark sensor, that is, the method of shifting the position of the eye mark sensor by a distance corresponding to the amount of shift of the cut position, the former method requires trial and error There is a lot of film loss,
In the latter method, it is only necessary to shift the position of the eye mark sensor, but on the other hand, there is a problem that the position adjustment must be performed while looking at the scale.

Further, in a continuous type packaging machine having a horizontal sealing operation, for example, when the ironing distance is changed or the operation pattern of the horizontal sealing jaws is changed according to the contents to be packaged, the film is simultaneously removed. In addition to the fact that the cutting position changes, the operator has to change the cutting position each time, and the adjustment requires more film.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem.
It is an object of the present invention to provide a method and an apparatus for adjusting a cut position in a new packaging machine that can automatically adjust a seal cut position of a bag simply by transporting a film to a cut position.

[0005]

That is, the present invention relates to a method of adjusting a cutting position in a packaging machine for achieving the above object until a cut portion of a film reaches a cutting position after detecting an eye mark. The feed amount of the film is measured, and the timing at the origin position of the horizontal seal member is calculated and set based on the feed amount, and an eye mark is detected as a device for this purpose. Means for measuring and storing the feed amount of the film from when the cut portion of the film reaches the cutting position, and means for calculating and storing the start timing from the origin position of the horizontal seal member based on the feed amount Is provided.

[0006]

Embodiments of the present invention will be described below. The drawings show an embodiment of the present invention applied to a vertical packaging machine having a horizontal sealing jaw performing a linear horizontal sealing operation.

First, the outline of the adjustment operation of the cut position of this apparatus will be described. The pull-down belt 2 is operated to detect the eye mark m while moving the film f. The feed amount of the film f is measured until the cut position is reached, and based on the measured amount, the bite position of the horizontal seal jaw 4, that is, the cut position of the film f is set.

Further, even when an operation parameter such as an ironing operation or a sealing operation is changed, a change in the meshing position of the lateral seal jaw 4 caused by the change is calculated based on the feed amount of the film f. And the adjustment is made.

FIG. 1 shows an embodiment of a device necessary for performing this adjustment operation. In the figure, reference numeral 10 denotes a cut position control circuit.
Is a film feed amount counter 11 that counts the feed amount of the film f by the pull-down belt 2 based on a detection signal from the eye mark sensor 1 as the number of rotations of the belt drive motor 3, and a film feed amount counter 11 that detects the eye mark m. f until the film f passes through a cutting position B in a simple operation pattern, for example, to a position where the cut portion attached to f crosses a straight line connecting the rotation axes of the left and right horizontal sealing jaws 4. Film feed amount storage means 12 for storing the film feed amount as a pulse number; and a jaw rotation counter 1 for counting the rotation amount of the horizontal seal jaw 4 from the origin position A to the film cutting position B as the rotation number of the jaw drive motor 6.
3, a jaw rotation amount storage unit 14 for storing the rotation amount of the horizontal seal jaws 4, 4 from the origin position A to the film cutting position B for each operation pattern as a pulse number, and a pulse stored in the film feed amount storage unit 12. Calculating means 15 for deriving the time when the horizontal sealing jaws 4 and 4 pass through the origin position A as the number of pulses of the film feed amount after passing through the eye mark m based on the number, and calculating the calculated number of pulses horizontally. The meshing position storage means 16 for storing the meshing positions of the seal jaws 4, 4, the jaw drive motor 6 for each operation pattern, and the drive motor 7 for horizontally moving and displacing the rotation axis of the horizontal seal jaws 4, 4 are provided. Operation pattern storage means 17 for performing the above-mentioned operation, and a required operation pattern designating signal is output to the operation pattern storage means 17 so that each motor control means 24, 2 It is constituted by the operation pattern designating means 18 for causing operation required jaw drive motor 6 and the rotary shaft movement motor 7 through.

In the figure, reference numeral 8 denotes a former, 21, 22
Denotes operation keys for starting and stopping the belt drive motor 3 and the jaw drive motor 6.

Next, a description will be given of the operation of adjusting the cutting position by the apparatus having the above-mentioned configuration with reference to FIGS. First, the belt drive motor 3 is started by the film feed key 21, and the film f is
(Step a). When the eye mark sensor 1 detects the eye mark m (step b)
The film feed amount counter 11 is operated by the detection signal, and the feed amount of the film f from the position of the eye mark is measured as a pulse number (step c). The measured value is reset every time an eye mark is detected, that is, every time the feeding of one bag is completed, and the measurement is restarted.

Next, when the cut portion applied to the film f crosses, for example, a line connecting the rotation axes 5, 5 of the left and right horizontal sealing jaws 4, 4, that is, the film f passes through the cutting position B in a certain operation pattern. (Step d), the film feed key 2 is used to adjust the cut portion to the cutting position B.
1 to stop the belt drive motor 3 (step E), and by operating a setting key (not shown), the number of pulses corresponding to the feed amount of the film f so far is stored in the film feed amount storage means 12 as a reference value. Preset as (Step f). Thereby, the feed amount from the eye mark to the cut portion for each bag is stored.

On the other hand, the horizontal sealing jaws 4, 4 are in the standby position,
That is, since the rotation amount from the starting position A to the cutting position B where the starting position A meshes is determined in advance by the set packaging speed and the starting position, this is set as the jaw rotation amount to the cutting position B and the jaw rotation amount. It is stored in the storage means 14.

Next, based on the number of reference pulses input as the feed amount of the film f, the amount of movement of the horizontal seal jaws 4, 4 from the point of detection of the eye mark to the point of reaching the cutting position B is calculated. To calculate the start timing of the lateral seal jaws 4, 4 at the origin position (step
G).

For example, assuming that the feed amount from the eye mark to the eye mark of each bag is 1000 pulses and the feed amount from the eye mark to the cut position of the bag is 500 pulses, the horizontal sealing jaws 4 are equivalent to 1000 pulses. Since one rotation is made by the film feed, if the feed amount from the eye mark detection to the film cut position is 500 pulses,
At the time of detection of the eye mark, the horizontal seal jaws 4, 4 must be located a half turn before the cutting position B.

On the other hand, the amount of rotation (time) from when the horizontal seal jaws 4, 4 start the origin position to reach the cutting position B.
Is stored in the jaw rotation amount storage means 14,
The rotation amount (time) is, for example, 30 times the film feed amount.
If it is equivalent to 0 pulse, at the time when the remaining 200 pulses (that is, 500−300 = 200) have elapsed,
If the waiting horizontal seal jaws 4 and 4 are started from the origin position, when 300 pulses have passed therefrom,
When the film reaches the cutting position B, the film cut portion also reaches the cutting position B at the same time.

In this way, the start timings of the seal jaws 4, 4 are determined and input to the mesh position storage means 16 (step).

Thus, if the horizontal seal jaws 4 are started at the time when the time from the detection of the eye mark m to the start timing has elapsed, the film f
And the transverse seal jaws 4 and 4 are properly engaged with the cut portion and cut.

On the other hand, when the packaging speed is changed, the ironing distance is adjusted according to the type of articles to be stored in the bag, or the sealing time is adjusted according to the material of the film f to be used. In other words, in the case of changing the operation parameter, from the origin position A to the meshing position B
Since the angular velocity up to and the meshing position B of the horizontal seal jaws 4 change, it is necessary to change the respective operation patterns of the motor 6 for rotating the horizontal seal jaws 4 and the motor 7 for moving the rotation axis in the horizontal direction.

That is, as shown in FIG. 4, during one rotation of the transverse seal jaw 4, the acceleration section Wa for the approach from the origin position A and the acceleration / deceleration section Wb for the stripping operation (ironing operation). , A stripping operation Wc for performing a constant speed operation of, for example, twice the speed of the film f, a sealing operation section Wd for operating the horizontal sealing jaw 4 at the same speed as the film f, and a uniform operation from the sealing operation. And a constant speed section Wf up to the origin position A. When these are changed according to changes in the packaging speed, the distance of the stripping operation, the sealing operation time, or the like, the horizontal seal jaw 4 is used. And the contents stored in the jaw rotation storage means 14 change at the same time.

Therefore, when the packaging speed, the stripping distance, the type of the sealing operation, the time thereof, and the like are designated by the operation pattern designating means 18 such as a keyboard while the packaging machine is operating or stopped, a flowchart shown in FIG. As described above, it is determined whether or not the operation parameter has been changed (step). If the operation parameter has been changed, the operation pattern storage unit 17 determines in advance the change in the angular velocity and the meshing position of the lateral seal jaw 4 in advance. The stored number of pulses is output, and based on this, the motor control means 2
The rotations of the jaw drive motor 6 and the rotation axis moving motor 7 are controlled via 4 and 25 (step nu).

Further, the rotation amount (time) from the origin position of the horizontal seal jaws 4, 4 to the meshing position according to the specified operation pattern is calculated in the same manner as described above (step). Based on the feed amount, the start timing of the horizontal seal jaws 4, 4 at the origin position is calculated and stored in the meshing position storage means 16 (step o), and the cut portion of the film f meshes with the horizontal seal jaws 4, 4. Match the position correctly.

In the above, the present invention has been described by using an example of a continuous packaging machine in which the swivel arm 5 is moved in the horizontal direction and the horizontal sealing jaws 4 perform a linear horizontal sealing operation. Other than this, for example, the present invention can be applied to a packaging machine of a type in which a horizontal seal member performs a box motion by a cam mechanism or the like.

[0024]

As described above, according to the present invention, the start timing at the origin position of the horizontal seal member is determined based on the film feed amount from the time of detection of the eye mark to the time the cut position of the film reaches the cut position. By simply setting the film feed amount from when the eye mark is detected until the cut part reaches the cutting position, the cutting position of the film and the meshing position of the horizontal seal member can be easily determined. In addition to being able to set correctly, such adjustments can be made without wasting film.

Further, even when an operation parameter such as an ironing operation or a sealing operation is changed, a change in the start timing at the origin position of the horizontal seal jaw caused by the change is obtained by calculation based on the film feed amount. Can be set easily.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an apparatus showing one embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of adjusting a cut position.

FIG. 3 is a flowchart illustrating adjustment of a cutting position when an operation parameter is changed.

FIG. 4 is a diagram showing an operation pattern of a horizontal seal jaw.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 eye mark detection sensor 2 pull-down belt 3 belt drive motor 4 side seal jaw 6 jaw rotation drive motor 7 jaw shaft drive motor 10 control circuit f film m eye mark

Claims (3)

[Claims] 1. A film feed amount from when an eye mark is detected until a cut portion of a film reaches a cutting position is measured, and a start timing at an origin position of the horizontal seal member is calculated based on the feed amount. A method for adjusting a cutting position in a packaging machine, characterized in that the cutting position is set. 2. A film feed amount from when an eye mark is detected to when a cut portion of the film reaches a cutting position is measured, and based on the feed amount, an origin position of the horizontal seal member which varies depending on an operation parameter. 2. The method according to claim 1, wherein the start timing is calculated and set. 3. A means for measuring and storing the feed amount of the film from when the eye mark is detected until the cut portion of the film reaches the cutting position, and based on the feed amount, the position at the origin position of the horizontal seal member is determined. An apparatus for adjusting a cut position in a packaging machine comprising means for calculating and storing a start timing.