JPH0958606A - Feeding device for cylindrical packaging material in bag making/packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bring a suction type pull-down belt into contact with a packaging material with an appropriate pressure. SOLUTION: A pair of position adjusting rods 13, 13 are attached in such a manner that they may separate from or approach each other by a turnbuckle 16. In addition, to the leading ends of the position adjusting rods 13, 13, suction type pull-down belts 4, 4 to which a returning habit is imparted, are attached by combining pieces 20... to constitute a parallel link. By doing so, the pull-down belts 4, 4 are pulled down by bringing them into contact with a packaging material with an appropriate pressure respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for feeding a tubular packaging material, which is generally called a pull-down belt, used in a bag-making packaging machine.

[0002]

2. Description of the Related Art A bag making and packaging machine typified by a vertical pillow packaging machine has a vertical edge formed by bending a long packaging material fed into a peripheral surface of a filling cylinder by a former so as to overlap each other. They are configured to be welded to each other and further pulled down to a horizontal seal mechanism immediately below by using a pull-down belt to weld the top portion and the base portion of the next bag at the same time.

As a pull-down belt used in this type of packaging machine, a type in which a packaging material is strongly pushed down and pulled down between a belt and a filling cylinder is widely used. It is necessary to embed rollers and slide plates on the cylinder side, which has the disadvantage of narrowing the passage path of the filling material. Also, in this type of device, the contact pressure can be adjusted programmatically. It was difficult.

On the other hand, the applicant of the present invention has disclosed in Japanese Patent Application Laid-Open No. 5-460.
In the case of the pull-down belt of the type proposed in Japanese Patent Publication No. 9 in which it is pulled down while adsorbing the packaging material, it does not have the above-mentioned inconvenience, but if the gap between the pull-down belt and the packaging material is too large. However, there is a problem in that the packaging material cannot be sufficiently conveyed due to insufficient suction force, and meandering occurs when the gaps between the left and right belts are not even.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of pull-down belts,
It is an object of the present invention to provide a new tubular packaging material feeding device that uniformly presses the packaging material with a slight force that is not sufficient to utilize the frictional force and conveys the packaging material.

[0006]

[Means for Solving the Problems] That is, in order to achieve the above object, the present invention conveys a long packaging material bent in a tubular shape along a filling cylinder by a pair of pull-down belts. In a packaging machine of a type, a pair of position adjusting members are arranged on both sides of a filling cylinder so as to be spaced apart from each other, and a pull-down belt provided with return habit is displaceably attached to each of these position adjusting members. It is the one.

[0007]

EXAMPLES Examples of the present invention will be described below. The drawings each show an embodiment of the present invention.

First, the outline structure of the vertical pillow packaging machine will be described with reference to FIG. 3. The packaging material S bent into a tubular shape by the former 2 mounted below the hopper 1 is arranged below the packaging material S. A pair of pull-down belts 4 and 4 equipped with a suction chamber 5 are pulled down to a horizontal seal mechanism (not shown) disposed below the filling cylinder 3 along the peripheral surface of the filling cylinder 3, and are shown separated from each other during this time. The vertical sealing jaws 8 are configured to seal the vertical joints.

On the other hand, reference numeral 10 in the drawing is a position adjusting mechanism for separating the left and right pull-down belts 4, 4 from each other according to the size of the mounted former 2, and this adjusting mechanism 10
Holds a pair of left and right position adjusting rods 13, 13 supporting the pull-down belts 4, 4 by a guide rod 12 hung on the machine frame 11 so as to be horizontally movable,
Further, a position adjusting motor 15 provided on one side of the machine casing 11
The position adjusting rods 13 and 13 can be moved away from each other by a turnbuckle 16 which is driven by.

1 and 2 show a fine adjustment mechanism for the pull-down belt 4 provided at the tip of the position adjusting rod 13, and a belt unit support plate for supporting the pull-down belt 4 together with a belt driving motor 6. A block 19 having an L-shape when viewed from the top is integrally fixed to the back surface of 18 and between the block 19 and the tip of the position adjusting rod 13 is a vertical parallel link mechanism. The position adjusting rod 13 is connected by a pair of connecting pieces 20, 20 and further protrudes to one side of the tip of the position adjusting rod 13.
A weak return spring 22 is interposed between the pull-down belt 4 and the L-shaped block 19 described above to keep the pull-down belt 4 at the neutral position, that is, the unloaded position shown by the solid line in FIG.
Is configured to be positioned and held.

Further, a detected rod 27 protruding to one side of the position adjusting rod 13 is fixed to the above-mentioned block 19, and the detected rod 23 is attached to the position adjusting rod 13.
Is provided with a limit switch 25 that outputs a signal for detecting the displacement of the position adjusting motor 15 and stopping the position adjusting motor 15.

FIG. 4 shows a control device for controlling the positioning adjusting mechanism 10. The control device 30 receives a signal from an external setting means 31 such as a keyboard or a touch panel and stores it in the storage means 33. Selected data for each former and outputting it to the comparing means 34, a storage means 33 for storing the count data for each former from the counting means 35, a data from the data selecting means 32 and the counting means 35. On the basis of the output pulse from the comparison means 34 which compares the count data from the above and outputs the signal just before the match and the match signal to the motor control means 36 and the rotary encoder 17 fixed to the axis of the position adjusting motor 15. , Counting means 35 for counting the number of rotations of the position adjusting motor 15 until a signal from the limit switch 23 is input.
And a motor control means 36.
Receives the signal from the comparing means 34 immediately before the coincidence and decelerates the position adjusting motor 15, and controls to stop it by the coincidence signal.

Next, the operation of the apparatus thus constructed will be described. First, the former 2 and the packaging material roll corresponding to the specifications and size of the package to be formed are attached to the packaging machine, and then the packaging material S is sent out to the former tube 3.

Under this state, the position adjusting motor 15 is operated to move the pair of left and right position adjusting rods 13 and 13 screwed to the common turnbuckle 16 in the direction in which they approach each other from the separated position holding them. .

When the pull-down belts 4 and 4 attached to the tips of the position adjusting rods 13 and 13 through the parallelogram link mechanism come into contact with the packaging material S located along the filling cylinder 3, these are moved. The weak pressure springs 22 and 22 are independently displaced while bending, and occupy positions suitable for sucking and transporting the packaging material S.

On the other hand, when the pull-down belts 4, 4 reach this position, the limit switch 25 attached to one of the position adjusting rods 13 causes the detected rod 2 to project.
3 is detected and the counting operation of the counting means 35 is stopped by the output signal thereof, while a signal is output to the motor control means 36 to stop the position adjusting motor 15.

When the above-described operation is repeated for each former 2, the movement amount for adjusting the position of the pull-down belt 4 for each former 2 is stored in the storage means 33 as the count number of the counting means 35. After that, when the size or the like of the former 2 is designated by the touch panel or the like, the data selection means 32 extracts the corresponding data from the storage means 33 and inputs this into the comparison means 34, and from this and the count amount of the counting means 35. It is possible to operate the position adjusting motor 15 and correctly position the two pull-down belts 4 and 4 without waiting for the detection signal from the limit switch 25 by outputting the output signal just before the match and the match signal. Becomes

In the embodiment described above, the parallelogram link mechanism with the weak return spring 22 interposed is used as the fine adjustment mechanism of the pull-down belt 4.
This can be replaced with a simple mechanism with one leaf spring interposed.

Further, a proximity switch is arranged at the contact portion between the filling cylinder 3 and the pull-down belt 4, and after the detection signal is output from this switch, the position adjusting motor 15 is reversed by a predetermined amount. Alternatively, the contact pressure between the filling cylinder 3 and the pull-down belt 4 may be adjusted.

[0020]

As described above, according to the present invention, a pair of position adjusting members arranged on both sides of the filling cylinder are arranged so as to be spaced apart from each other, and the position adjusting members are provided with a return habit. Since the attached suction type pull-down belt is attached via a parallel link mechanism so as to be freely displaceable, each pull-down belt is brought close to the packaging material fed along the filling cylinder with an appropriate pressing force. It is possible to pull down the packaging material correctly and effectively.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main part of a packaging material feeding mechanism that constitutes an embodiment of the present invention.

FIG. 2 is a top view of a main part of the same mechanism.

FIG. 3 is a perspective view showing an example of a vertical pillow wrapping machine having the same mechanism.

FIG. 4 is a view showing a control device for controlling the same mechanism.

[Explanation of symbols]

 1 Hopper 2 Former 4 Pull-down Belt 10 Position Adjustment Mechanism 13 Position Adjustment Rod 15 Position Adjustment Motor 16 Turnbuckle Mechanism 20 Coupling Piece 22 Return Spring 25 Limit Switch

Claims (5)

[Claims] 1. A packaging machine of the type in which a long packaging material bent in a tubular shape is transferred by a pair of pull-down belts along a filling cylinder, and a pair of position adjusting members are separated from each other on both sides of the filling cylinder. A tubular packaging material feeding device in a bag-making packaging machine, wherein the pull-down belt provided with return habit is displaceably attached to each of the position adjusting members so as to be accessible. 2. The bag making and packaging machine according to claim 2, wherein each of the position adjusting members is movably attached with the pull-down belt provided with return habit through a parallelogram link mechanism. Feeder for tubular packaging material 3. A driving means for moving the pair of position adjusting members away from each other is provided, and the driving means is stopped by the displacement of the pull-down belt on the position adjusting member. Claim 1
A device for feeding a tubular packaging material in the bag making and packaging machine described. 4. A control means for storing a movement amount of the position adjusting member which varies depending on a size of the former and for controlling the driving means based on the stored movement amount. A device for feeding a tubular packaging material in the bag making and packaging machine described. 5. The bag-making package according to claim 1, wherein after the proximity switch is actuated, the contact pressure can be adjusted by operating the driving means in reverse by a predetermined amount. Feeder for tubular packaging materials in machines.