JPH085463B2 - Crimping device for film heating and compression rolls - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a roll crimping device for heating and crimping a film in a packaging machine or the like for packaging powders or liquids.

[Prior Art] Conventionally, a film heat-bonding roll of a packaging machine for packaging powder particles or the like is provided with a plurality of recessed rows having a plurality of recesses in the axial direction at equal intervals in the circumferential direction. It is provided with a pair of fixed-side rolls and movable-side rolls in which a seal portion having a large number of minute irregularities with a fine pitch is formed. The fixed-side roll is fixedly supported by bearings, while the movable-side roll is supported by bearings that can adjust the clearance and pressure contact pressure with the fixed-side roll along the guide rails. It is configured to be capable of synchronous rotation in opposite directions. In such a film thermocompression bonding roll, two films supplied to the gap between a pair of rolls are heat-sealed by sandwiching the two films with a sealing part having minute irregularities to heat-seal the hollow part. The powder and granules supplied to are packaged.

The sealing effect of the film by the film heat-bonding roll is mainly influenced by the pressure of pressing both rolls, the temperature of both rolls, and the time, and by appropriately managing them, a sealing failure is prevented from occurring. Of these, although the temperature and time can be controlled relatively easily, it is relatively difficult to properly control the pressure.

In particular, when the movable roll is adjusted in the gap and pressure with the fixed roll along the guide rail as described above, the movable roll must be guided very accurately by the guide rail. The rattling of the rolls prevents the peaks and troughs of the seal portions of the pair of pressure-bonding rolls from properly meshing with each other, resulting in poor sealing, resulting in a precise and expensive device.

[Problems to be Solved by the Invention] An object of the present invention is to make it possible to accurately control the position and pressure contact pressure of a pair of film heating and pressing rolls by a simple means.

[Means for Solving the Problems] The present invention is capable of rotating a pair of fixed-side and movable-side film heating and pressure-bonding rolls provided with a seal portion having a large number of finely-pitched concavities and convexities on the surface with the base end as a machine body. The rotation arm attached to the shaft is pivotally supported so that the rolls can be synchronously driven in the opposite directions, and a position control mechanism for controlling the roll position is provided on the rotation arm that supports the fixed pressure roll. , A detector for detecting the roll position is provided, and a position-adjustable adjuster that engages with the pressure detection load cell on the machine body is provided on the pressure displacement adjusting shaft connected to the rotating arm that supports the movable pressure-bonding roll. A spring for applying a pressure contact force to the pressure roll is interposed between the pressure detecting load cell and the pressure displacement adjuster whose position is adjustable on the adjusting shaft, and It is a solution to the problem.

[Operation] When the film is heat-sealed, an appropriate position is determined in advance according to the film thickness of the fixed roll. The position of the fixed roll is determined by moving the roll once to a position in contact with the other movable roll, setting it as the origin position, and retracting it by an appropriate amount determined by the thickness of the film. Its position can be detected by a detector.

When setting the film between the pair of pressure-bonding rolls at the time of heat-sealing, the fixed-side roll is once moved to the retracted position, and after inserting the film between the pair of pressure-bonding rolls in this state, the position is set to the previously determined position. Move the fixed roll. As a result, the roll can be held at an appropriate position determined by the film thickness. The position of the other movable pressure-bonding roll is adjusted by the position of an adjuster provided on the pressure displacement adjusting shaft, and the pressure contact force of the roll with respect to the film is adjusted by the pressure displacement adjuster.

When the film is set between both rolls, the movable roll retracts slightly according to the film thickness, the force of the spring acts on the film as the pressure contact force between the rolls, and the roll position as the output of the pressure detection load cell. And the pressure is detected.

After making the necessary adjustments for each of the above parts, the rolls that were inserted between the two rolls were driven by rotating both rolls.
A sheet of film is heat sealed.

[Embodiment] FIGS. 1 and 2 show an embodiment of the present invention, in which a pair of film thermocompression-bonding rolls 1 and 2 have a plurality of recesses 3, ... A plurality of rows are formed at equal intervals in the direction, and a seal portion 4 having a large number of irregularities with a fine pitch is regularly formed on the roll surface between the depressions.

Roll shafts 5 and 6 integrated with the film heating and pressing rolls 1 and 2 are rotatably supported at the tips of rotating arms 7 and 8, respectively, and these rotating arms 7 and 8 are supported by a support shaft 9 at a fixed portion of the machine body. It is rotatably attached by 10 and 10. Therefore,
The film heating and pressing rolls 1 and 2 are rotated around the support shafts 9 and 10 so as to come into contact with and separate from each other, or are brought into pressure contact with each other at a required pressure.

Further, as can be seen from FIG. 2, the film heating and pressure bonding rolls 1 and 2 have a gear train 13, 14, 1 axially supported on a rotating arm 7, 8 from a drive gear 11 which is appropriately driven by a driving device.
5 and 16, 17 and 18 are configured to be synchronously rotatable in mutually opposite directions, and the gear 16 meshing with the drive gear 11 and the gear 13 meshing with the gear 16 are the rotating arms 8 and 7, respectively.
It is rotatably mounted on the spindles 10 and 9. Therefore, each gear can always be kept in an appropriate meshing state regardless of the rotational positions of the rotary arms 7 and 8.

The rotary arm 7 having the fixed-side roll 1 of the pair of film thermocompression-bonding rolls 1 and 2 attached at its tip,
A position control mechanism for controlling the roll position is provided.
That is, at the base end of the rotary arm 7, a worm wheel 21 is fixed to the rotary arm 7 on a support shaft 9 supporting the rotary arm, and a worm screw 22 meshing with the worm wheel 21 has a power transmission mechanism 23. Through servo motor
Connected to 24. Also, the worm screw 22 has
A rotary encoder is connected as a detector 25 for detecting the rotational position of the rotary arm 7.

On the other hand, the rotary arm 8 that supports the movable pressure-bonding roll 2
A pressure displacement adjusting shaft 30 is rotatably connected to the intermediate position of the adjusting shaft 32, and an adjusting element 32 constituted by a position adjusting nut is screwed into a threaded portion 31 of the adjusting shaft 30.
The pressure detection load cell 33 with the outer case 33a attached to the machine body 34
Is engaged with the outer side of the inner case 33b. Further, the spacer 36 abutting on the opposite side of the inner case 33b and the adjustment shaft 30
A spring 38 for applying a pressure contact force to the pressure roll 2 is provided between the pressure displacement adjuster 37 and a pressure displacement adjuster 37 formed by a nut screwed into the upper screw portion 31.

The output of the pressure detection load cell 33 can be appropriately displayed on a display device, and if necessary, the servo motor 24 can be driven by the output to control the position of the pressure bonding roll 1.

When heat-sealing a film with the roll pressure bonding device having the above-described configuration, first, the fixed-side roll 1
Is moved to the retracted position indicated by the chain line by the servo motor 24, and in this state, the film 41, 42 is placed between the pair of pressure-bonding rolls 1, 2.
Insert.

The operating position of the pressure-bonding roll 1 on the fixed side for heat sealing is determined in advance before the films 41 and 42 are inserted. The operation position is determined by moving the roll 1 to a position where it comes into contact with the roll 2 and setting it as the origin position, and then retracting the roll 1 by an appropriate amount determined by the thickness of the film. Since the position of the roll 1 can be detected by the rotary encoder provided on the worm screw 22, the position can be easily set when the roll 1 is moved to the operating position during heat sealing.

The position of the other pressure-bonding roll 2 can be adjusted by the adjuster 32 screwed into the screw portion 31 of the pressure displacement adjusting shaft 30,
The pressure contact force of the roll 2 with respect to the film can be adjusted by the pressure displacement adjuster 37.

When the films 41 and 42 are not set, the pressure detection load cell 33 is in a state where the reaction force of the spring 38 acts via the spacer 36 and at the same time, the same force acts from the adjuster 32 in the opposite direction. On the other hand, when the films 41 and 42 are set, the load cell 2 is slightly retracted according to the thickness of the films, and the force of the spring 38 acts as a pressure contact force against the films 41 and 42 by the roll 2. In this state, the inner body 33 of the pressure detection load cell 33 is
A small displacement occurs between a and the outer case 33b, and the position and pressure of the roll 2 are detected as the output of the pressure detection load cell 33. The output of this pressure detection load cell 33 is the servo motor 24
By feeding back to, the pressure between the load cells can be controlled to be constant.

After performing necessary adjustments in each of the above parts, and setting the films 41 and 42 between the pair of pressure bonding rolls 1 and 2, from the drive gear 11 that is rotationally driven, the gear that is axially supported on the rotary arms 7 and 8. Both rolls 1, 2 are rotationally driven in opposite directions via rows 13, 14, 15 and 16, 17, 18 so that each of the two films 41, 42 inserted between the heated rolls is It is heat-sealed by the seal portion 4 of the roll.

[Effects of the Invention] According to the present invention, the following effects can be expected.

(1) Conventionally, since the unevenness of the surface of the pressure-bonding roll cannot be visually observed, the gap between the rolls is manually adjusted by relying on the intuition, while the gap between both pressure-bonding rolls and the pressure-bonding force of the film are controlled. Automation can be realized.

(2) The pressure bonding force of the roll can be controlled by detecting and quantifying the pressure bonding force of the roll.

(3) Since the roll on the fixed side can be easily moved to the retracted position, the work of passing the film through and the maintenance are facilitated.

(4) When the thickness of the film changes, the gap between the pressure-bonding rolls is arbitrarily adjusted by holding the position of the fixed roll at an appropriate position according to the thickness, and The thickness can be adjusted and the work can be performed automatically.

(5) Since the fixed-side and movable-side rolls are attached to the tip of the rotatable rotation arm, the seal parts of the pair of rolls are compared to when the movable-side roll is slidable along the guide rails. It is possible to properly engage the peaks and troughs of each other and suppress the occurrence of defective sealing.

[Brief description of drawings]

FIG. 1 is a front view showing a part of an embodiment of a roll crimping device according to the present invention in section, and FIG. 2 is a front view of a drive system for a crimping roll. 1,2 …… Film heating and pressure roll, 4 …… Seal part, 7,8
...... Rotary arm, 25 …… Detector, 30 …… Pressure displacement adjustment shaft, 32 …… Adjuster, 33 …… Pressure detection load cell, 34 ……
Aircraft, 37 …… Pressure displacement regulator, 38 …… Spring, 41,4
2 ... film.

Claims (1)

[Claims] 1. A pair of fixed-side and movable-side film heating and pressure-bonding rolls, each having a seal portion having a large number of fine pitch irregularities on its surface, are attached to the tip of a rotary arm whose base end is rotatably attached to a machine body. By supporting them, the rolls can be driven to rotate synchronously in mutually opposite directions, and a position control mechanism that controls the roll position is provided on the rotating arm that supports the pressure-bonding roll on the fixed side, and detection that detects the roll position is performed. The pressure displacement adjusting shaft connected to the rotating arm that supports the movable side pressure roll is equipped with a position adjustable adjuster that engages with the pressure detecting load cell on the machine body, and the pressure detecting load cell and the adjusting shaft are also provided. A film heating and pressure-bonding roll characterized in that a spring for exerting a pressure contact force on the pressure-bonding roll is interposed between the pressure-displacement adjuster whose position can be adjusted above. Crimping machines.