JPS5924386Y2 - Coating machine for sheet paper - Google Patents

Description

[Detailed description of the invention] This invention relates to a coating machine that applies relatively high viscosity paint, such as ultraviolet curable resin paint, to sheets of paper in order to polish the printed surface. .

To apply ultraviolet curable resin paint to the surface of paper sheets,
Gravure coaters, 3-roll coaters, 14-roll direct type coaters, etc. are used, and these coaters have a coating temperature of 300 C, for example.

It is difficult to apply a paint with a high viscosity such as P or S.

Further, it is generally known that it is extremely difficult to make a solvent-free ultraviolet curable resin coating suitable for paper surface treatment with a low viscosity of less than 300 C, P, S.

Although a reverse roll coater is known as a device capable of applying relatively high viscosity paint, it was generally considered impossible to apply this to sheets of paper.

The main reason for this is that it is impossible to feed the sheet with the feed roll of the paper feed mechanism and pass it between the reverse-rotating application roll and backup roll of the reverse roll coater. Even if this were done, the front edge of the sheet would be coated with a thick coat of paint, and after the trailing edge of the sheet had passed the feed roll, the feeding speed of the sheet would change and the coated surface would be coated. There is a problem that boundaries are formed between the sheets, resulting in uneven coating.Furthermore, if the backup roll is replaced depending on the width of the sheet, this roll is expensive and extremely uneconomical in terms of workability.

This invention solves the above-mentioned problems and makes it possible to apply paint to sheets of paper using a reverse roll coater and without the use of fingernails. The object of the present invention is to provide a sheet coating machine that can apply a highly viscous paint evenly.

An embodiment of this invention will be described below with reference to the drawings.

In the figure, 1 is a reverse type roll coater.
This coater 1 includes a coating roll 2 and a coating roll 2.
This is a conventionally known device comprising a plowing roll 3 circumscribing the plowing roll 3 and a plowing plate 4 contacting the plowing roll 3.

A backup roll 5 is installed below the application roll 2 of the reverse type roll coater 1 and rotates forward in the sheet transport direction. 6 is formed, and mounting means 8 for a band-like object 7, which will be described later, is provided in the relief groove so as not to protrude from the outer periphery of the side 5a.

The strip 7 is made of an elastic material with a large coefficient of friction such as rubber, and is removably wound under tension around the outer peripheral surface of the body 5a of the backup roll 5 by means of attachment means 8.

The shaft 5b of the backup roll 5 is pivotally supported by a swing lever 9, the base end of the swing lever 9 is pivotally connected to a machine frame (not shown), and a cam follower 10 is rotatably attached to the tip of the swing lever 9. installed.

The swing lever 9 is supported by the first and second cams 12.13 of the operating mechanism 11 via a cam follower 10, and these cams 12.13 are equipped with a servo motor and a planetary gear mechanism via a shaft 14. Drive is transmitted from drive means 15.

A paper feed mechanism 16, which will be described later, is installed behind the backup roll 5 and coating roll 2, a paper feeder 17 is installed behind this mechanism 16, and a conveyor 18 is installed in front of the backup roll 5 and coating roll 2. is installed.

The paper feeding mechanism 16 has an upper and a lower pair of cr) o-ru 19.
a, 19 b and h 20a.

Front and rear infeed rolls 19 and 2 with 20 b
0 and a front register 21 installed between these, the front,
The upper rolls 19a, 20a of the post-feed rolls 19, 20 are vertically swingable.

Then, in response to the feeding operation of one sheet by the paper feeder 17, the backup roll 5 rotates once and moves up and down once, and the front register 21 rotates once, and the front and rear feed rolls 19
, 20 and 20 are configured to move up and down once each, and each roll and cam is configured to rotate in the direction of the arrow in the figure.

Next, the operation of the sheet coating machine configured as described above will be explained.

When a sheet of paper is sent from the paper feeder 17, it passes under the upper roll 20a of the rear feed roll 20 that is raised, and the front end hits the raised front register 21 and rolls over. Stop.

At the same time as the front register 21 is lowered, the upper roll 20a of the rear feed roll 20 is lowered to transport the sheet forward.

When this sheet reaches the front feed roll 19, the upper roll 19a has been lowered, so the front feed roll 19
At this point, the sheet begins to be transported forward, and at the same time, the upper roll 20a of the rear feed roll 20 is raised, and the sheet transport operation by the rear feed roll 20 is completed.

The front end of the sheet being transferred and the backup roll 5
The backup roll 5 is adjusted so that the front end in contact with the escape groove 6 of the sheet coincides with the front end of the sheet, and the front end of the sheet is transferred to the contact point between the coating roll 2 and the backup roll 5 of the reverse type roll coater 1. When the first cam 12 of the operating mechanism 11 rotates, the convex portion 12a of the first cam 12 rotates the swing lever 9 via the cam follower 10, pushes up the backup roll 5, and coats the sheet via the strip e77. Press it against roll 2.

At the same time, the upper roll 19a of the front feed roll 19 is raised, and the sheet transport operation by the front feed roll 19 is completed.

By this time, the front register 21 has been raised to prevent the next sheet from being transferred forward.

The frictional force of the strip 7 is large, and the frictional force between it and the sheet of paper is greater than the frictional force between the sheet of paper, the paint, and the applicator roll 2, so the backup roll 5 rises and this causes the strip of material 7 and When pressed against the application roll 2 through the sheet,
The sheet is fed forward by the rotation of the backup roll 5 and coated with paint by the coating roll 2.

When the sheet is fed forward to a certain extent in this state, the cam follower 10
is transferred from the convex part 12a of the first cam 12 to the convex part 13a of the second cam 13, which rotates integrally with the first cam 12, and the rear end of the sheet is transferred to the backup roll 5 and the coating roll. 2, the cam follower 10 comes off the protrusion 13a of the second cam 13, and the backup roll 5
The swing lever 9 is rotated by gravity and lowered, separating from the coating roll 2 and completing the coating work.

At this time, since the front part of the sheet is placed on the conveyor 18, the sheet is conveyed out by driving the conveyor 18 immediately after the backup roll 5 is lowered.

Note that the convex portions 12a and 13a of the first and second cams 12.13
The continuous length of the second cam 13 in the circumferential direction needs to be changed depending on the length of the sheet and changes in the coefficient of friction between the sheet and the application roll. By adjusting the rotation, the convex portions 1 of the first and second cams 12.13
This is adjusted by changing the overlapping length of 2a and 13a.

The rotation of the second cam 13 is adjusted by making use of the planetary gear mechanism used in the drive means 15, and can be adjusted by looking at the actual coated sheet during rotation, or by moving the sheet forward. Preferably, a mechanism for detecting the front end is provided for adjustment.

Furthermore, the width of the strip is somewhat narrower than the width of the sheet of paper to be coated to prevent paint from adhering to the strip,
Depending on the width of the sheet, replace it as appropriate and use one with an appropriate width.

In this invention, the paper feeding mechanism can be modified as appropriate, such as using a swing gripper or a register with a chain, and the operating mechanism is not necessarily limited to that of the above-described embodiment.

As explained above, the sheet coating machine of this invention includes a reverse type roll coater, a backup roll with a relief groove provided in a part of the circumferential direction of the body, and a mounting roller provided in the relief groove. A belt-like material made of an elastic material having a large coefficient of friction and detachably wound around the backup roll by a means, and a swinging lever on which the backup roll is pivotally supported, and the backup roll is coated with the roll coater at a predetermined timing. The apparatus is equipped with an operating mechanism that moves toward and away from the roll, and a paper feeding mechanism that is installed behind the backup roll and the coating roll and sequentially feeds sheets between them.

Therefore, according to this invention, the operating mechanism starts coating the sheet by bringing the backup roll into pressure contact with the applicator roll through the strip and sheet of paper, and further coats the sheet by separating the backup roll from the applicator roll. During coating, because the coefficient of friction between the strip and the sheet of paper is large, the sheet of paper can be transferred and coated by the rotation of the backup roll without using nails. By using a reverse roll coater, it is possible to coat sheets of paper evenly with a highly viscous paint, and there is no need to use nails.

Furthermore, this invention has the advantage that if the strip is replaced according to the width of the sheet, there is no need to replace rolls such as backup rolls, and it can be used economically to coat twigs of different widths. There is.

[Brief explanation of drawings]

The figure is a schematic side view showing one embodiment of this invention. 1... Reverse type roll coater 2...
・Application roll, 5...Backup roll, 6
... Relief groove, 7 ... Band-like material, 8 ...
... Mounting means, 9... Swinging lever, 11...
...Operating mechanism, 16...Paper feeding mechanism.

Claims (1)

[Scope of utility model registration request] A Novath type roll coater, a backup roll with a relief groove provided in a part of the circumferential direction of the drum, and an elastic material with a large coefficient of friction that is removably wrapped around the backup roll using a mounting means provided in the relief groove. A strip consisting of;
an operating mechanism that supports a swing lever on which the backup roll is pivotally supported and causes the backup roll to approach and separate from the application roll of the roll coater at a predetermined timing; and an operation mechanism that is installed behind the backup roll and the application roll; A coating machine for sheet paper, characterized by a paper feeding mechanism that sequentially feeds sheets of paper between.