JPS6110971Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminator, and particularly relates to an improvement in a pressure adjustment device for a pressure roller that pressures a heated plastic film together with a sheet to be sealed.

Although the surface layer of the laminator's pressure roller has some elasticity, the objects to be sealed range from thin paper sheets to thick plates, so all of these objects can be crimped with appropriate pressure. It is impossible to do so.

In order to adjust this pressure bonding force, stopping the operation of the laminator and replacing pressure rollers with different diameters for each object to be sealed is not only inefficient, but also requires time to reheat the pressure rollers after replacement. It is time consuming and extremely inefficient. In addition, simply configuring the distance between the pressure rollers to be variable requires strict adjustment according to the thickness of the sheet, which not only results in poor operability, but also makes it difficult to obtain the appropriate pressure force. Can not.

Furthermore, if one of the roller shafts of a pair of pressure rollers is set as a fixed shaft and the other is set as a movable shaft, the movable shaft is biased by a spring, and the spring biasing force is simply varied by a cam, the cam will not be affected by the component force. The force generated causes the cam to rotate inadvertently, making it impossible to maintain a constant spring biasing force.

The present invention was developed in view of the above points, and its purpose is to fix one roller shaft of a pair of pressure rollers that press a heated plastic film together with a sheet, while making the other roller shaft movable. The movable roller shaft is supported by a spring in the direction of the fixed roller shaft, and the spring biasing pressure can be adjusted by a cam whose rotation is adjusted by an externally operable ratchet mechanism. Therefore, it is an object of the present invention to provide a laminator that can eliminate the above-mentioned defects and provide an appropriate pressure bonding force depending on objects to be sealed having different thicknesses.

The configuration of the laminator according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the laminator according to the present invention, showing a state in which a plastic film is stretched.

The plastic films 1, 1' are, for example, transparent films laminated with polyethylene and Mylar, and are wound around a pair of upper and lower supply reels (or cassettes), not shown.

The intermediate rollers 2, 2' are arranged to hold the film 1, 1' unwound from the supply reel so that the film 1, 1' is in contact with the rotating heating roller 3, 3' for a long time.
This is to change the running direction of the vehicle.

A pair of upper and lower rotating heating rollers 3, 3' of the same type are equipped with a heating element, and heat the films 1, 1' in contact with the heating element to a temperature at which they can be fused.

Since the circumferential speed of the heating rollers 3, 3' and the transport speed of the films 1, 1' are the same, the films 1, 1' are transported to the pressure rollers 5, 5' while rolling in contact with each other without slipping.

The pressure rollers 5, 5' are each made of a hollow cylinder made of a material having heat resistance and elasticity, such as silicone rubber, which is fitted onto a roller shaft, and its surface is finished to be smooth.

On the other hand, a sheet 7, which is an object to be sealed and placed on an insertion table 6 and laterally regulated by a guide plate 8, is spread over a pair of upper and lower pressing rollers 5, 5' to form two sheets of film 1, 1'. When inserted between them, the pressure rollers 5, 5' press the films 1, 1' together with the sheet 7 from above and below, and heat-seal the peripheral edge of the film, which is slightly larger than the sheet 7. Furthermore, film 1, 1'
By appropriately selecting the type and heating temperature, it is possible to fuse one or both of the films 1, 1' and the sheet 7.

The films 1, 1' with the sheet 7 sealed thereon are held between a pair of upper and lower pull-out rollers 9, 9' and led out to the left take-out port, completing the sealing process.

The pull-out rollers 9, 9' are molded from the same material as the pressure rollers 5, 5', and their circumferential speed is set to be slightly faster than that of the pressure rollers 5, 5'. 1 and 1' are transported under constant tension.

The rotating heating rollers 3, 3', the pressure rollers 5, 5', and the pull-out rollers 9, 9' are driven by a drive motor 10 via a chain, a timing belt, or the like.

FIG. 2 is a cross-sectional view showing the detailed configuration of the crimping force adjusting device according to the present invention, and FIG. 3 is a vertical cross-sectional view thereof. The pressure rollers 5, 5' are integrally fitted onto the roller shafts 4, 4'. The roller shaft 4' of the lower pressure roller 5' is fixedly supported by the machine frame 11, while the roller shaft 4 of the upper pressure roller 5 is supported by a movable bearing 12 that moves in parallel in the vertical direction. ing.

An operating handle 1 extending outward from the cover 13
Reference numeral 4 is for adjusting the pressing force between the pressing rollers 5 and 5', and a pointer 16 fixed to the operating handle shaft 15 is connected to a scale (not shown) engraved on the cover 13. A predetermined pressure force can be set by matching scales such as the distance between sheets, the thickness of the sheet, and the angle.

An eccentric cam 17 and a ratchet wheel 18 are arranged side by side on the operating handle shaft 15 and fixed with a set screw. A circular hole 19a into which the eccentric cam 17 fits is formed in the lower part of the sliding plate 19, and a U-shaped notch 19b is formed in the upper part to allow the eccentric cam 17 to slide, avoiding the fixed roller shaft 4'. Two guide rods 21 and 21' are installed on both sides of the U-shaped notch 19b, and in order to allow the ratchet wheel 18 to rotate in only one direction, it is provided with right-handling properties by a spring. The pivot of the ratchet pawl 20 is implanted.

A movable bearing 12 and a spring receiver 22 are loosely fitted into the guide rods 21, 21', and stoppers 21a, 21a' are formed above the guide rods 21, 21' to limit the upward movement of the spring receiver 22.

A spring 23 is provided between the movable bearing 12 and the spring bearing 22.
is inserted.

On the spring receiver 22 side, a spring pressure fine adjustment bolt 24 is screwed into a screw hole drilled in the spring receiver 22 in order to finely adjust the spring pressure, and a nut 25 that contacts this bolt 24 and the spring 23 is attached. They are screwed together to form a compression force fine adjustment mechanism.

Since this crimping force fine adjustment mechanism utilizes a screw connection, it can be inserted into the transmission system from the cam to the spring, allowing fine crimping force adjustment and crimping force adjustment that cannot be achieved with a ratchet mechanism alone. This is effective for expanding the range.

To describe the operation of the pressure roller pressure adjustment device having the above configuration, the sheet 7 and the plastic film 1 to be sealed with a laminator,
When the operating handle 14 is rotated to bring the pointer 16 into alignment with a scale (not shown) displayed on the cover 13 that corresponds to the crimping force according to the thickness of the cover 13,
The eccentric cam 17 rotates at the same time, and the sliding plate 19 moves up or down.

2 and 3 show a state in which the eccentric cam 17 is maximally displaced in the upward direction. In this case, the upper end of the sliding plate 19 directly pushes up the movable bearing 12 and The pressure roller 5 is spaced apart from the lower pressure roller 5' to facilitate the work when the films 1, 1' are spread on the laminator.

Films 1 and 1' are held between pressure rollers 5 and 5',
After being expanded, if the operating handle 14 is operated and rotated clockwise from the position shown in FIG. 3, the pressure force between the rollers will be strengthened.

For example, at a certain angle from the starting position in Figure 3,
When it rotates clockwise, the ratchet pawl 20 engages with the teeth of the ratchet wheel 18 to prevent the eccentric cam from rotating counterclockwise, and the eccentric cam 17 eccentrically lowers the sliding plate 19 by a certain amount, so that it slides. The guide rod 21 installed on the moving plate 19 also lowers, and the stoppers 21a, 21'
The position of a is lowered. Therefore, the spring receiver 22 also resists the expanding force of the spring 23 and closes to the stoppers 21a, 21'a.
, the distance between the movable bearing 12 and the spring bearing 22 becomes smaller, and the spring pressure roller 5
The pressure to do so will become stronger. In this way, by appropriately setting the rotational position of the eccentric cam 17 with the operation handle 14, the pressing force between the pressing rollers 5 and 5' can be changed arbitrarily, and the eccentric cam 17 can be changed as desired.
The rotation position is between the ratchet wheel 18 and the ratchet pawl 2.
By engaging with 0, fine adjustments can be made, and
Sliding plate 1 subjected to rising behavior due to the pressure of spring 23
9, even if a rotational force is applied to the eccentric cam 17, the ratchet pawl 20 prevents it from rotating, so the eccentric cam 17 does not rotate unexpectedly, and therefore the pressing force is maintained constant.

As is clear from the detailed description above, the present invention fixes one roller shaft of a pair of pressure rollers, movably locks the other roller shaft, and springs the movable roller shaft in the fixed roller axial direction. At the same time, since the spring biasing force can be adjusted by a cam whose rotation is adjusted by an externally operable ratchet mechanism, it is easy to replace the pressure roller when sealing sheets having various thicknesses. Therefore, there is no need to stop the operation of the equipment each time, so there is no need to reheat the heating roller that has cooled down while it is stopped, making it an efficient laminator that eliminates the waste of waiting. Second, since it does not adjust the gap between the pressure rollers, it is easy to adjust, and it is possible to apply pressure suitable for sealing sheets of a wide range of thicknesses. Thirdly, since the cam that varies the pressing force is associated with the ratchet mechanism, it is possible to make quick and delicate adjustments, and the pressing force is always kept constant by preventing rotational couples caused by component forces acting on the cam. Can be done.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view schematically showing the structure of a laminator, FIG. 2 is a cross-sectional view of the crimping force adjusting device according to the present invention, and FIG. 3 is a vertical cross-sectional view thereof. 1,1...plastic film, 3,3'...
...Heating roller, 4...Movable roller shaft, 4'...
Fixed roller shaft, 5, 5'... Pressure roller, 7...
...Sheet, 9,9'...Pull-out roller, 10...
Drive motor, 12...Movable bearing, 14...Operation handle, 17...Eccentric cam, 18...Ratchet wheel, 19...Sliding plate, 20...Ratchet claw, 2
1, 21'... Guide rod, 22... Spring holder, 23...
...Spring, 24...Spring pressure fine adjustment bolt, 25...
Natsuto.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a laminator that heats two sheets of plastic film and then sandwiches and seals the sheet to be sealed between the two sheets, a pair of crimping that presses the heated plastic film together with the sheet. One roller shaft of the roller is fixed, the other roller shaft is movably supported, the movable roller shaft is biased by a spring in the direction of the fixed roller shaft, and is rotated by an externally operable ratchet mechanism. A laminator having a crimping force adjusting device, characterized in that a spring biasing pressure can be adjusted by a cam that is adjusted. (2) A laminator having a crimping force adjustment device according to claim 1, wherein a spring pressure fine adjustment mechanism by screw connection is inserted in the transmission system from the cam to the spring.