JPH10101008A - Positioning device of pull-down belt in bag forming and packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly and continuously feed a packaging material by supporting a pull-down belt through an elastic member, detecting the displacement of the elastic member, stopping the movement of the pull-down belt, and bringing the pull-down belt into contact with automatic contact with the packaging material with a small force to reduce the friction between the belt and a former tube. SOLUTION: A turnbuckle which has been driven and rotated by a step motor 5 brings a pair of right and left belt support frames 4 close to each other from the position of the origin, and a pull-down belt 1 supported through a parallelogram link 18 is brought into contact with a packaging material S along the former tube. A limit switch 19 on the belt support frame 4 stops the pull-down belt 1 and detects a projected rod 14 to be detected, outputs the detected signal to a motor control means, and drives the step motor 5 for several pulses in the reverse direction to retract the pull-down belt 1 from a surface of the packaging material S. The pull-down belt 1 is located at the position suitable for sucking the packaging material S.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction pull-down belt positioning device in a bag making and packaging machine of a type in which packages are continuously formed from long packaging materials.

[0002]

2. Description of the Related Art A pull-down belt for pulling down a packaging material bent into a tubular shape under a horizontal sealing mechanism is generally of a type in which the packaging material is strongly sandwiched between a belt and a filling cylinder and pulled down. Although these are widely used, this type requires a roller or sliding plate to be embedded in the filling cylinder side, narrowing the passage of the filling material, or adjusting the contact pressure programmatically In addition, in order to solve such a problem, the present applicant proposes a pull-down belt proposed in Japanese Patent Application Laid-Open No. Hei 5-4609, that is, while adsorbing a packaging material by a suction force. Although the pull-down belt of the pulling-down type does not have the above-described disadvantages, even if the gap between the pull-down belt and the packaging material is too large or small, the packaging material can be efficiently moved by the suction force. Room for further improvement in terms such as can not be sent are left.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of this type of suction-type pull-down belt, and an object thereof is to provide a tubular-shaped packaging material. On the other hand, an object of the present invention is to provide a new pull-down belt positioning device in a bag making and packaging machine that can automatically bring the pull-down belt into contact with a small force that is not enough to utilize the frictional force.

[0004]

That is, the present invention provides a positioning device for a pull-down belt in a bag-making and packaging machine for achieving the above object. Driving means for moving and displacing to the surface, means for detecting that the pull-down belt has approached the surface of the packaging material by displacement of the elastic member supporting the pull-down belt, and stopping the driving means based on the detection output of this detecting means Control means for stopping the driving means based on the detection output of the detection means, and then separating the pull-down belt from the surface of the packaging material by a distance necessary to bring about the suction action. It is intended to be controlled.

[0005]

Embodiments of the present invention will be described below. The drawings show an embodiment of the present invention for a pull-down belt positioning device.

FIG. 2 shows a suction-type pull-down belt mechanism which is controlled to move toward and away from a packaging material S which is bent into a cylindrical shape. Each is supported by belt support frames 4 and 4 screwed to the turnbuckle 3, and is configured to move between the former tube 9 and the origin position by a step motor 5 fixed to the machine frame 2, The amount of movement of these pull-down belts 1 and 1 is determined by the drive motor 5
Motor 5 via a rotary encoder 6 attached to the
Is configured to be detected by a pulse transmitter 7 proportional to the rotation of. In addition, the code | symbol 8 in a figure has shown the heater belt which welds the longitudinal edge of the packaging material S mutually.

FIG. 1 shows an embodiment of the present invention for a position adjusting mechanism of the lower pull-down belt 1. As shown in FIG. This device is configured so that a belt supporting frame 4 is separated and approached by a turnbuckle 4 driven and rotated by a step motor 5 on a machine frame 2.

At the tip of the adjustment frame 4, an L supporting the pull-down belt 1 via a parallelogram link 18
A mold support plate 17 is attached, and a weak return spring 13 is interposed between the L-shaped support plate 17 and the protrusion 16 protruding from one end of the belt support frame 4.
3, the pull-down belt 1 is always held at a neutral position, that is, a no-load position indicated by a solid line in the drawing.

A detection rod 14 protruding from one side of the belt support frame 4 is attached to the L-shaped support plate 17 and detected by a limit switch 19 provided on the belt support frame 4. , So that it can be detected that the pull-down belt 1 has come into contact with the packaging material S.

In the embodiment configured as described above, when the currently specified former tube 9 is mounted on the apparatus and an operation button (not shown) is pressed, the turnbuckle 3 driven by the stepping motor 5 and started to rotate is turned off. Then, the pair of left and right belt support frames 4 are made to approach from the origin position, and the pull-down belt 1 supported via the parallelogram link 18 is brought into contact with the packaging material S located along the former tube 9.

Although this contact involves a certain contact pressure,
As described above, since the pull-down belt 1 and the belt support frame 4 are attached in opposite directions via the weak return spring 16, when the pull-down belt 1 comes into contact with the packaging material S, the pull-down belt 1 When stopped, the detected rod 14 projects to the position indicated by the two-dot chain line in FIG.

Therefore, in such a state, the limit switch 19 on the belt support frame 4 detects the detected rod 14, outputs a detection signal to the motor control means, and drives the step motor 5 by several pulses. And then pull down the pull-down belt 1 as shown in FIG.
The pull-down belt 1 is positioned at a position suitable for sucking the packaging material S by slightly retreating from the surface.

In the above-described embodiment, the weak return spring 13 is interposed between the end of the belt support frame 4 and the L-shaped support plate 17, and the detection rod 14 is attached to the L-shaped support plate 17. Although the relative displacement between the belt support frame 4 and the pull-down belt 1 is detected by a limit switch 19 on the belt support frame 4, the pull-down belt 1 is supported via a parallel leaf spring. Attached to the frame 4, the relative displacement between the pull-down belt 1 and the belt support frame 4 can be detected by a strain gauge provided on a parallel leaf spring.

[0014]

As described above, according to the present invention, the pull-down belt is supported via the elastic member, and the displacement of the elastic member is detected to stop the movement of the pull-down belt. Can be automatically brought into contact with the packaging material with a small force that is not sufficient to utilize the frictional force.

[0015] Further, since the pull-down belt is slightly retracted from the surface of the packaging material after contact, the contact pressure with the packaging material is reduced, so that the frictional resistance between the packaging material and the inner former tube is reduced. And the packaging material can be smoothly and continuously fed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a belt position adjusting mechanism according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a pull-down belt mechanism to which the present invention is applied.

FIG. 3 is a diagram showing an operation of a belt position adjusting mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pull-down belt 4 Belt support frame 5 Step motor 13 Return spring 18 Parallelogram link 19 Limit switch S Packaging material

Claims (2)

[Claims] 1. A bag making and packaging machine of a type in which a long packaging material bent into a cylindrical shape is transferred to a horizontal sealing site by a suction type pull-down belt, wherein the pull-down belt is bent from an origin position into a cylindrical shape. Drive means for moving and displacing to the surface of the packaging material, and means for detecting that the pull-down belt has approached the surface of the packaging material by displacement of an elastic member supporting the pull-down belt,
A pull-down belt positioning device in a bag making and packaging machine, comprising: a control unit for stopping the driving unit based on a detection output of the detection unit. 2. The control means stops the driving means on the basis of the detection output of the detection means, and then separates the pull-down belt from the surface of the packaging material by a distance necessary for providing the suction action. The pull-down belt positioning device in the bag making and packaging machine according to claim 1, wherein the pull-down belt positioning device controls the pull-down belt.