JPH11165714A - Heat-sealing apparatus for automatic packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate correctly the gap (clearance) between a pair of lateral heat-sealing rolls by single manipulation based on numerical control according to a program preset for each of elements such as the kind of a packaging film, the thickness thereof, or the material therefor in a die roll sealing system automatic packaging machine. SOLUTION: In this die roll sealing system automatic packaging machine, one lateral heat-sealing roll 1 is constituted into a stationary structure, and the other lateral heat-sealing roll 2 into a movable structure. By constituting the other lateral heat-sealing roll 2 in such a manner that its up-and-down motion can be freely operated by a motor 10M, and by controlling the operation of the motor 10M by a control unit 12 in accordance with an element of a packaging film to be used, the clearance H between both the lateral heat-sealing rolls 1, 2 is properly regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat sealing apparatus suitable for use in an automatic packaging machine, and more particularly, to a horizontal heat sealing apparatus for applying a horizontal seal to a packaging film.

[0002]

2. Description of the Related Art Since a packaging film used in an automatic packaging machine has different thickness and properties depending on various factors such as quality and material, a pair of horizontal heat seals rotating oppositely rotating packaging films having different thicknesses and properties. When used in an automatic packaging machine of a die roll sealing system configured to perform horizontal sealing by pressing between rolls, it is necessary to adjust the interval between the horizontal heat sealing rolls according to the type of packaging film.

Therefore, conventionally, the interval between the rolls has been adjusted by replacing the horizontal seal member (seal bar) attached to the horizontal heat seal roll main body with one having an arbitrary thickness (width).

FIGS. 3 and 4 are a cross-sectional view and an exploded perspective view for explaining the above-mentioned conventional structure. In FIG.
Is a pair of left and right horizontal heat seal rolls, YA and XA are the roll bodies, YD and XD are rotation axes of the roll bodies YA and XA, SH is a horizontal seal section, and YB and XB are each roll body Y
A, XA reference flanges attached to both ends of XA, Y
C ... and XC ... are seal bars which are fitted into mounting grooves formed on the peripheral surfaces of both roll bodies YA and X, and are replaced by replacing the seal bars YC and XC with each other to provide a space between the horizontal heat seal rolls Y and X. It is a mechanism to adjust H.

[0005] However, in the structure in which the seal bars YC and XC are exchanged to adjust the interval H between the horizontal heat seal rolls Y and X, the horizontal heat seal rolls Y and X are packed every time the interval H is adjusted. Remove from the machine side, each seal bar YC,
Since the XC has to be replaced, there is a problem that the adjustment work is very troublesome and takes time and effort.

On the other hand, for example, Japanese Patent Laid-Open No. 1-2389
The heat sealing device described in FIG. 8 of Japanese Patent Publication No. 22 and FIG. 2 of Japanese Patent Application Laid-Open No. 4-1144841 is configured such that one of a pair of horizontal heat sealing rolls is fixed and the other is movable. The distance H between the horizontal heat seal rolls Y and X is adjusted by adjusting the movement of the other movable horizontal heat seal roll using an adjusting bolt or a cylinder mechanism. It has features that make adjustments relatively easy.

[0007]

However, in all of the above-mentioned conventional heat sealing apparatuses, the distance H is adjusted almost by relying on the operator's intuition by manually operating an adjusting bolt or a cylinder mechanism. In addition, it is extremely difficult to adjust the clearance (clearance) of the thickness of the packaging film, which is several μ to several tens μ, with sufficient precision, and it takes a considerable amount of time to adjust the clearance. Even after adjusting the distance, it is necessary to repeat the fine adjustment by monitoring the actual dimensions and the condition of the horizontal seal while continuing the trial sealing for a while. During that time, the packaging film and filling material (material to be packaged) However, there is also the uneconomical disadvantage that a considerable amount is wasted.

Accordingly, a technical problem of the present invention is to determine the distance (clearance) between a pair of horizontal heat seal rolls in an automatic packaging machine of a die roll seal system by changing the type, thickness, material, etc. of the packaging film. And one-touch accurate adjustment by numerical control according to a program preset for each element.

[0009]

Means taken by the present invention to solve the above-mentioned technical problems are as follows.

[0010] An automatic packaging machine of a die roll seal system, wherein a packaging film is sandwiched between a pair of horizontal heat sealing rolls rotating opposite to each other to perform horizontal sealing,

(1) At least one of the pair of horizontal heat seal rolls has a fixed structure and the other has a movable structure, and the movable horizontal heat seal roll has a fixed structure according to the rotation of the motor. , The distance between the two horizontal heat seal rolls is configured to be adjustable, and the horizontal heat seal roll distance adjustment by rotation of the motor is controlled by the type of packaging film,
Numerical control is performed based on each element such as thickness and material, and a program for this numerical control is stored in a memory for each element of the packaging film. (Claim 1)

(2) A movable bearing that rotatably supports a horizontal heat seal roll having a movable structure, the movable bearing approaches the horizontal heat seal roll having a fixed structure. And various pressurizing means such as an air cylinder or a pressurizing spring that can move in the direction of pressure, and operate in accordance with the rotation of the motor to move the movable bearing in the opposite direction away from the pressing force of the pressurizing means. Linking a movable distance adjusting member. (Claim 2)

According to the first aspect of the present invention, by calling the program stored in the memory, the interval between the horizontal heat seal rolls can be changed so that the type, thickness, material, etc. of the packaging film to be used can be determined. Can be adjusted automatically and accurately in a short time to the interval suitable for the element of the above. It is possible to simplify the interval adjustment and uselessly consume the packaging film and filling material by trial seal. It is possible to reduce as much as possible.

According to the second aspect of the present invention, the motor, which is numerically controlled in accordance with the program, activates the distance adjusting member, so that the movable bearing is fixed to the pressurizing means. By moving the roller in the direction of contact with and separating from the bearing, the distance between the horizontal heat seal rolls can be automatically adjusted to a distance suitable for the packaging film to be used.

As described above, the above (1),
By solving the above technical problem by means of (2),
The problem of the conventional technique can be solved.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the entirety of the present invention. FIGS. 2A and 2B are side sectional views of the relevant parts. In these drawings, reference numerals 1 and 2 generally denote a pair of horizontal heat seal rolls 1A and 1A, respectively. 2
A is the roll main body, 1B, 1B and 2B, 2B are inter-axis reference flanges mounted on both ends of each roll main body 1A, 2A, and 1C... 2C are equally spaced on the peripheral surface of each roll main body 1A, 2A. The seal bars 1D and 2D mounted on the shafts are rotating shafts protruding in the axial direction at both ends of each of the roll bodies 1A and 2A.
The other horizontal heat seal roll 2 has a movable structure.

Reference numeral 3 denotes a fixed frame on an automatic packaging machine (not shown) side, and 1E and 1E denote fixed bearings mounted on the fixed frame 3 via mounting members 6 and 6. These fixed bearings 1E, The rotating shafts 1D, 1D of one of the horizontal heat seal rolls 1 having the above-mentioned fixed structure are rotatably supported during 1E.

Reference numerals 2E and 2E denote movable bearings mounted on a frame (not shown) of the automatic packaging machine so as to be movable (movable to and away from) the fixed bearings 1E and 1E. The rotating shafts 2D, 2D of the other horizontal heat seal roll 2 having the movable structure described above are rotatably supported between the movable bearings 2E, and the movable bearings 2E, 2E have guides for guiding the movement. The members 7, 7 are attached.

Each of the automatic packaging machines 5 and 5 has an end 5a, 5a abutting against one side of the movable bearing 2E, 2E (specifically, one side of the guide member 7, 7). An adjustment screw shaft screwed forward or backward in one of the fixed frames 4, 4 or the mounting members 6, 6 described above.
10M is provided with each adjusting screw shaft 5 via a shaft coupling (not shown).
A motor such as a servo motor connected to 5 and 11 is a support base to which these motors 10M and 10M are attached.

8, 8 are fixed frames 9, 9 of the automatic packaging machine.
Between the distal ends of the adjustment dials 8, 8 and the other side surfaces of the movable bearing dials 2E, 2E (specifically, the other side surfaces of the guide members 7, 7). , Movable bearings 2E, 2E are always fixed bearings 1E, 1
Pressing springs 8S, 8S for pressing and moving in the direction of E are interposed, and the above-mentioned bearings 1E, 8S are driven by the forward / reverse rotation of the motors 10M, 10M and the resilient action of the pressing springs 8S, 8S. The interval between 1E and 2E, 2E, specifically, the interval H (clearance) between the horizontal heat seal rolls 1 and 2
Is designed to be freely adjustable.

In some cases, air cylinders or other cushion members are attached to the movable dials 2E, 2E in place of the adjusting dials 8, 8 and the pressure springs 8S, 8S to press the movable bearings 2E, 2E. Which one to use is optional.

Further, in FIG. 1, reference numeral 12 denotes a control unit for each of the motors 10M, 10M constituted by using a microcomputer, and 13 denotes various control units for numerically controlling the interval H to the control unit 12. An interval setting means 14 such as a numeric keypad for inputting a program is a memory for storing a system program and various data.

As shown in FIG. 2, a packaged product F which is sandwiched by a pair of horizontal heat seal rolls 1 and 2 and has a horizontal seal SH is made of various materials such as the type and thickness of the packaging film to be used or the material. The most preferable thickness of the horizontal seal portion SH is different depending on the element, and the distance H between the horizontal heat seal rolls 1 and 2 is inevitably different depending on the element. Therefore, in the present invention, each element of the packaging film is The program for numerical control for adjusting to the preferable interval H required for the memory is stored in the memory 14 of the controller 12 using the interval setting means 13 in advance.
By storing a large number in the (RAM), the operation of each motor 10M, 10M is to be controlled.

When the packaging film to be used is determined, an operation unit (not shown) provided in the control unit 12 is operated to store a numerical control program suitable for the element in the memory 14.
Select and call from each motor 1 according to this program.
By controlling and operating 0M and 10M (rotational pulse) to advance or retreat each of the adjusting screw shafts 5 and 5, the distance H between the two horizontal heat seal rolls 1 and 2 is most suitable for the packaging film used. It is set automatically to the state.

Although the drawings show adjusting screw shafts 5 and 5 as interval adjusting members operated by the motors 10M and 10M, this is an example of the embodiment, and for example,
The movable bearings 2E, 2E may be configured to be pressed and moved by using an actuator such as a cam disk rotated by the motors 10M, 10M, and the selection is arbitrary.

[0026]

As described above, according to the heat sealing apparatus for an automatic packaging machine according to the present invention, the interval between the pair of horizontal heat sealing rolls is set by numerical control to the most preferable state suitable for the packaging film to be used. The operation between the two rolls can be done very easily and accurately with one touch, so the operation is very simple. It is also economical to minimize as much as possible, and is very suitable for use in an automatic packaging machine of the die roll seal type.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a part of a cross section of a heat sealing apparatus for an automatic packaging machine according to the present invention.

FIG. 2 is a sectional view of a main part of the present invention.

FIG. 3 is a sectional view of a conventional device.

FIG. 4 is an exploded perspective view of a conventional device.

[Explanation of symbols]

 1, a pair of horizontal heat seal rolls 1E fixed bearing 2E movable bearing 5 interval adjusting member (adjusting screw) 8S pressing spring (pressing means) 10M motor 12 control unit 13 interval setting means 14 memory H roll interval

Claims (2)

[Claims] 1. A die roll seal type automatic packaging machine configured to compress a packaging film between a pair of horizontal heat seal rolls rotating opposite to each other to perform horizontal sealing, wherein the pair of horizontal heat At least one of the seal rolls has a fixed structure, and the other has a movable structure. The interval between the seal rolls is configured to be adjustable, and the adjustment of the interval between the horizontal heat seal rolls by the rotation of the motor is numerically controlled based on each type of packaging film, such as the type, thickness, and material. A heat sealing apparatus for an automatic packaging machine, wherein the program for the numerical control is stored in a memory for each element of the packaging film. 2. A movable bearing for rotatably supporting a horizontal heat seal roll having a movable structure, wherein the movable bearing is provided in such a direction that the horizontal heat seal roll of the movable structure approaches the horizontal heat seal roll having a fixed structure at all times. Various pressurizing means such as air cylinders or pressurizing springs that can be pressurized and moved in accordance with the rotation of the motor to move the movable bearing in the opposite direction away from the pressing force of the pressurizing means. 2. The heat sealing device for an automatic packaging machine according to claim 1, wherein a distance adjusting member that can be connected is connected.