JPH06199301A - Operating method for bag filling machine - Google Patents

Abstract

PURPOSE:To avoid improper detection, and improve productivity by a method wherein the opening condition of a bag is detected in an opening process by utilizing cases with and without negative pressure occurring in the pipe to a vacuum pump and, if no negative pressure is detected, the bag is filled with its contents and sent back to the opening process to repeat the aforesaid detecting action. CONSTITUTION:A detecting vacuum pressure switch 8 is for detecting the existence of negatice pressure when a bag 2 is opened in an opening process and, if any negative pressure is detected, the bag is filled with its contents, its opening is sealed and the bag is sent to the next process. On the other hand, if no negative pressure is detected, the bag 2 is filled with the contents, its opening is left unsealed, the bag is sent back to the opening process without being carried out and by being clamped by a table clamping means and the aforesaid detecting action is repeated. Since this negative pressure detection is numerically performed by the instructions from a sequencer 7, independently of the shape and size of the bag 2 or changes in the material, the aforesaid method provides a proper and efficient inspection and freedom in mounting a detecting vacuum pressure switch 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating an intermittent drive rotary type bagging and packaging machine.

[0002]

2. Description of the Related Art FIG. 9 is a schematic plan view of a rotary type bag packing and packaging machine disclosed in Japanese Patent Laid-Open No. 12421/1989, which is in the middle of intermittent rotation of the table 1 in the arrow direction, that is, to be filled. During the rotation of the filling process C and the sealing process D, the detection means p
There is disclosed a device for confirming the existence of an object to be filled by contacting with the packaging bag 2 and circulating the clamping means for grasping the bag without releasing it when the object to be filled is not present. In the drawing, A is a bag supplying process, B is a bag opening process, E is a seal cooling process, and F is a bag discharging process.

[0003]

According to the above-mentioned device, since the detecting means p is attached in the state of protruding in the vicinity of the table 1 which rotates, it hinders the operation and causes a change in various packaging bags. There is a problem of how to deal with the problem, and how to properly operate the packing bag, otherwise, there is a problem of detection error and a hindrance to productivity.

[0004]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and is characterized in that the change in the vacuum suction action of the suction cup that opens the bag in the opening step, that is, in the vacuum pump. The open state of the bag is detected by using the presence / absence of negative pressure in the piping path. If negative pressure is detected, the filling material is put in, the mouth seal is applied, and the bag is discharged to the next process.
If the negative pressure is not detected, the bag is not charged and the mouth seal is not sealed, and the bag is not discharged and is guided to the opening step again while being clamped by the table clamping means. The purpose is to repeat the cycle.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an overall perspective view of an intermittent drive rotary type bag packing and packaging machine. 1 is a table which is rotated intermittently, 2 is a packaging bag (hereinafter referred to as a bag), 3 is a clamp means which is attached to the table 1 at equidistant circumferential positions so as to grip the bag. The bag 2 is grasped by the clamp means 3, and the table 1 is intermittently rotated in the direction of the arrow to imprint the date (II), open the bag (III), and put the object to be filled (IV). Sealing process (V), cooling process (V)
Each work is performed while passing through I) and the bag discharge process (VII) in this order.

Numeral 4 is an adsorption plate for opening the bag in the bag opening step (III), which is abutted on the front and rear positions of the center of the bag and is adsorbed by the negative pressure by the operation of the vacuum pump. The opening action is performed by the operation described below. FIG. 2 shows the structure of the bag opening means.
Is a vacuum pump, 6 is a solenoid vacuum switching valve, 7 is a sequencer, and 8 is a detection vacuum pressure switch provided in the pipe 9 path to the suction plate 4.

In the above, the detection vacuum pressure switch 8 is the bag 2
It detects the negative pressure when the opening occurs, and when the adsorption is not performed, the negative pressure is not generated. Here, the solenoid vacuum switching valve 6 is turned on and off in accordance with the instruction of the sequencer 7 in synchronization with the intermittent rotation of the table.

FIG. 3 shows the releasing operation by the above-mentioned detection vacuum pressure switch 8 with respect to the clamping means of the bag 2.
The configuration is such that the bag 2 supply step (I) and the bag discharge step (VI)
I). In the drawing, portions other than the one-dot chain line excluding the cylinder 10 have the conventional structure, that is, the rotation of the cam 11 rotated in conjunction with the rotation of the table 1 causes the operating rod to move through the lever 12 and the rod 13. By swinging 14 and impressing the engagement piece 16 of the bag grasping arm 15, the grasping claw 3 is released against the spring 18, and the bag is grasped and the grasped bag 2 is discharged.

By the way, in the present invention, the rod 13 and the lever 1
2 is attached via an air cylinder 10, and the operation of the operating rod 14 with respect to the bag gripping arm 15 can be changed by the air cylinder 10 regardless of the rotation of the cam 11.

That is, the signal detected by the detection vacuum pressure switch 8 is switched by the sequencer 7 to switch the compressed air of the compressed air switching valve 19 to operate the air cylinder 10 as appropriate, regardless of the rotation of the cam 11. That is, when no negative pressure is generated in the suction cup 4 for opening the bag, the operating rod 14 is not operated and the bag 2 is not discharged.

FIG. 4 shows the function of stopping the bag feeding by the above-mentioned detection vacuum pressure switch 8 in the bag feeding step (I), and the portion other than the one-dot chain line shows the conventional construction. Although not described, in the present invention, when the negative pressure is not detected by the detection vacuum pressure switch 8, the bag 2 is not released, and the bag suction cup 19 and the vacuum pump 5 are not released.
The vacuum switching valve 20 provided between and cuts the vacuum to stop the bag supply.

FIG. 5 is a flow sheet showing the process of the method of the present invention, which is an example in which the material to be filled is charged separately into a solid material and a liquid. In the figure, the opening detection is the detection of the presence or absence of negative pressure by the detection vacuum pressure switch 8, the recycling is incorporated in the sequence so as to be performed three times, and the rest is the automatic drop as in the conventional case.

FIG. 6 shows an example in which the object to be filled is manually inserted in the inserting step. The bag 2 on the table whose opening is detected and which is gripped by the clamp means is temporarily stopped and the lower position of the insertion is performed. A closing confirmation switch is provided in the table, and the table is restarted when the switch is detected.

FIG. 7 shows a process in the case of interlocking the loading of the object to be filled with a computer scale. The table is temporarily stopped and the loading is confirmed and detected only when there is a time delay in weighing with respect to the number of revolutions of the packaging machine. It is a flow sheet showing an efficient process for preventing empty bags by incorporating an electric circuit for restarting.

FIG. 8 is a flow sheet showing the process in the case of interlocking the can inserter.

[0016]

The present invention is carried out as described above, and it is simple and easy to improve a part of the conventional device, and it is extremely economical. In particular, the detection vacuum pressure switch according to the present invention has no restriction on the mounting position thereof, so that the entire apparatus can be made compact. Further, since the negative pressure is detected numerically regardless of changes in the shape, size and material of the bag, there is no detection error and the efficiency is extremely good.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an intermittent drive rotary type bag filling and packaging machine.

FIG. 2 is an explanatory view showing a structure of bag opening means.

FIG. 3 is an explanatory view showing a releasing operation of the clamp means.

FIG. 4 is an explanatory view showing a bag supply stopping action in a bag supply process.

FIG. 5 is a flow sheet showing the process of the method of the present invention.

FIG. 6 is a flow sheet of another example.

FIG. 7 is a flow sheet of another example.

FIG. 8 is a flow sheet of another example.

FIG. 9 is a schematic plan view of a conventional rotary bag filling and packaging machine.

[Explanation of symbols]

 1 table 2 packaging bag 4 suction plate 5 vacuum pump 7 sequencer 8 vacuum pressure switch for detection

Claims (1)

[Claims] 1. A rotary type having a step of supplying bags one by one to a table provided with a plurality of clamping means, opening the gripping state, charging a filling material, sealing a mouthpiece, and discharging the bag. In the bag packing machine, the open state of the bag is detected by using the change of the vacuum suction action of the suction cup that opens the bag in the opening process, that is, the presence or absence of negative pressure in the piping path of the vacuum pump. When the pressure is detected, the filling material is added, the sealing is performed, and the bag is discharged to the next process. However, when the negative pressure is not detected, the filling material is added and the sealing sealing is performed. And without being discharged, the bag is guided to the opening step again while being clamped by the clamping means of the table,
A method for operating a bag packaging machine, which is characterized by repeating circulation.