JP2000025704A - Packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sense an abnormality of a former tube ahead. SOLUTION: In a process wherein a pair of pull-down belts 1L, 1R are brought into contact with a former tube 9 by a turnbuckle mechanism 4, a distance from a point when one pull-down belt 1R has come into contact with the former tube 9 to a point when the other comes into contact with, is measured as a pulse number, and when the moving distance exceeds a previously set distance, it is judged that there is a deformation on the former tube 9, or a dislocation of the installation, and a warning lamp 18 is lit up.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging machine, and more particularly, to a vertical packaging machine characterized in that abnormality of a former tube is monitored.

[0002]

2. Description of the Related Art In a vertical packaging machine, usually, a pair of left and right pull-down belts are pressed against the peripheral surface of a former tube, and a long film bent in a cylindrical shape by a former is sequentially disposed below the former. It is configured to transfer to the horizontal seal mechanism.

For this reason, in this type of vertical packaging machine, it is desirable that the axis of the former tube is correctly positioned between the left and right pull-down belts in order to transfer the film correctly. In some cases, misalignment may occur in the shaft center due to an assembly error or damage when dropped, and in such a case, there is a difference in film feeding, and the film feeding may meander, or the cutting position of the bag. Inconveniences such as the occurrence of deviation occur.

[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 new packaging machine capable of detecting an abnormality of a former tube in advance in a preparation operation for bringing a pull-down belt into contact with the former tube.

[0005]

That is, according to the present invention, as a packaging machine for achieving the above object, a driving means for moving a pair of pull-down belts apart from and closer to a former tube, and one of the pull-down belts is a former. Means for measuring the moving distance of the pull-down belt from when the tube comes into contact with the other, and means for judging the former tube as abnormal when the moving distance exceeds a predetermined distance. It is provided with.

[0006]

According to this structure, in the process of preparing the pair of pull-down belts to abut on the former tube, a pair of pull-down belts is formed on the basis of a moving distance from when one abuts to when the other abuts. Be sure to detect any abnormalities in the Martube in advance.

[0007]

Embodiments of the present invention will be described below. The drawings show an embodiment of the present invention.

In the figure, reference numerals 1L and 1R denote a pair of pull-down belts disposed on both sides of the former tube 9 so as to sandwich the former tube 9 therebetween.
1R is attached to sliders 3 and 3 via parallel link mechanisms 2 and 2 so that it can be displaced left and right by about 12 mm while always maintaining a neutral position by a spring (not shown), and is driven by drive motor 5. The turnbuckle mechanism 4 is operated so as to be able to separate and approach.

The sliders 3, 3 are provided with displacement detection sensors 7L, 7R for detecting a displacement when the pull-down belts 1L, 1R abut on the former tube 9 within a maximum allowable error range of, for example, 4 mm. Further, a reference position sensor 8 for detecting a part 3a of one of the sliders 3 and outputting a reference position signal is provided here.

Reference numeral 6 in the drawing denotes a detector for counting the number of rotations of the drive motor 5 as a pulse number via a rotary encoder in order to detect the feed amount of the sliders 3, 3.

On the other hand, reference numeral 10 in the drawing denotes an abnormality judging device for the former tube 9, and the abnormality judging device 10
Receives the first detection signal from one of the displacement detection sensors 7 and outputs a signal for storing the pulse count value in the storage means 13, and inputs the next detection signal and outputs the pulse count value to the comparison means 15. A signal input / output means 11 for outputting a signal to the pulse counting means 12 and outputting a motor stop signal to the motor control means 16 for inputting, and a pulse signal from the counter 6 upon receiving a reference position signal from the reference position sensor 8 And receives the first signal from the signal input / output means 11 and stores the pulse count signal at that time in the storage means 13
And the pulse counting means 12 for counting the number of pulses between the first and second signals and outputting the counted value signal to the comparing means 15, and between the pull-down belt 1 and the former tube 9. A maximum allowable error value setting unit 14 that outputs the maximum allowable error value to the comparing unit 15 as the number of pulses;
The count signal from the pulse counting means 12 is compared with the set value signal from the maximum allowable error value setting means 14, and a signal is output to turn on the external alarm lamp 18 when the count value exceeds the set value. And a comparing means 15.

In the apparatus having the above-described structure, first, the former tube 9 corresponding to the size of the bag to be formed is mounted on the packaging machine, and then the drive motor 5 is started by operating the manual operation means 17 to turn the drive motor 5 on. The pair of pull-down belts 1L, 1R coupled to the left and right sliders 3, 3 screwed to the respective reverse screw portions 4a, 4b of the buckle mechanism 4 via the parallelogram links 2, 2 are moved toward the former tube 9. Let it.

When the slider 3 starts moving in the center direction beyond the reference position with this operation, a detection signal from the reference position sensor 8 is input to the pulse counting means 12 to count the number of pulses from the counter 6. Let count.

In this manner, for example, the right pull-down belt 1R having a small distance CR from the former tube 9 abuts on the former tube 9, and is displaced from the neutral position to the right in the figure, and a part 1a thereof is formed. Displacement detection sensor 7R
Is detected, the pulse counting means 12 which has received the first detection signal outputs the number of pulses from the reference position to the storage means 13 and simultaneously starts counting the number of new pulses therefrom.

Then, slightly later, when the left pull-down belt 1L contacts the former tube 9 and is detected by the corresponding displacement detection sensor 7L, the signal input / output means 11 receives the second detection signal. The driving motor 5 is stopped via the motor control means 16, and the count signal from the pulse counting means 12 is compared with the comparison means 15.
Output.

Since the number of pulses corresponding to the preset maximum allowable error value δ of, for example, 4 mm is input to the comparing means 15 from the maximum allowable error value setting means 14, the first and second pulses are input here. When the signal of the number of pulses counted during the detection signal is input, the comparing means 15 determines that the count value is equal to or smaller than the maximum allowable error value δ, that is, δ> CL−
If CR, the former tube 9 is determined to be normal, and if the count value is equal to or greater than the maximum allowable error value δ, that is, if δ <CL−CR, the former tube 9 is abnormal. And outputs an abnormal signal to the external alarm lamp 18 to light it, and the former tube 9
The operator is notified that the tube itself is deformed or the assembly position is misaligned, and the former tube 9 is inspected or replaced.

It should be noted that the pulse counting means 12 to the storage means 1
The number of pulses from the reference position input to 3 is used as a teaching when the former tube 9 of the same size is mounted next.

[0018]

As described above, according to the present invention, the moving distance from the time when one of the pull-down belts comes into contact with the former tube to the time when the other comes into contact is measured. Because it was made to judge that there was something wrong with the former tube when it exceeded it,
In the process of preparing for the operation of the packaging machine, such as bringing a pair of pull-down belts into contact with the mounted former tube, detect deformation of the former tube, abnormalities in the assembly position, etc. in advance. In addition, the formation of a defective bag can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a packaging machine according to an embodiment of the present invention.

[Explanation of symbols]

 1L, 1R Pulldown belt 3, 3 Slider 4 Turnbuckle mechanism 5 Drive motor 7L, 7R Displacement detection sensor 9 Former tube 10 Judging device

Claims (3)

[Claims] A driving means for moving a pair of pull-down belts away from and approaching the former tube; and a movement of the pull-down belt from when one of the pull-down belts comes into contact with the former tube until the other comes into contact therewith. A packaging machine comprising: means for measuring a distance; and means for determining that the former tube is abnormal when the moving distance exceeds a predetermined distance. 2. The packaging machine according to claim 1, wherein said pair of pull-down belts are moved while supporting said pair of pull-down belts so as to be displaceable in a radial direction of said former tube. 3. The packaging machine according to claim 1, wherein said determination means outputs a signal for activating an alarm means when an abnormality is determined.