JP2002137358A - Doctor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a doctor device a which has a simple constitution and needs less space and has no restriction on setting doctoring conditions. SOLUTION: In the doctor device used in gravure printing, a mechanism in which a doctor blade itself is made to be a belt type and while the belt-type doctor blade 1 is rotated and moved, it is pushed to a plate cylinder is provided. As a mechanism for rocking a doctor holding trestle like the conventional doctor device is not necessary, the constitution can be made very simple and a space around the doctor device can be ensured. For rocking of the doctor blade 1, as it is only enough to change rotating and moving speed of the doctor blade 1, the rocking speed of the doctor blade 1 can be set without receiving any restriction on rotating speed of the plate cylinder and in addition, as there exists no movement back and forth caused by rocking as before, there exists no stopping point when left and right are switched.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a doctor device used for removing ink on the surface of a plate cylinder in gravure printing.

[0002]

2. Description of the Related Art In general, in a gravure printing machine or a gravure coater machine, a doctor device is used to scrape off unnecessary ink on the surface of a plate cylinder. A steel blade of about 0.30 mm is used for the doctor blade. Mechanically, the doctor blade is shaped so that the doctor blade in the shape of a strip is sandwiched and fixed in the doctor holder, the doctor holder is fixed to the holder holding base, and the doctor blade is pressed against the plate cylinder surface. The device is common. Then, the doctor blade is strongly pressed against the chrome-plated plate cylinder surface, and the ink is scraped off while sliding on the plate cylinder surface which is a non-image area.

[0003]

In the above-mentioned conventional doctor device, it is necessary to swing the doctor blade relative to the plate cylinder surface in order to stabilize and improve the scraping property of the doctor blade. For this reason, the blade is swung by directly swinging the holder holding gantry, but since a mechanism for swinging the holder holding gantry is required,
The doctor device has a complicated and space-saving structure. Further, when a positioning function (elevating, turning, etc.) is required for the doctor holding base, the apparatus is inevitably complicated and enlarged.

Further, when the driving source for swinging the doctor blade is taken from the main engine for driving the plate cylinder, the swing speed must depend on the rotation speed of the plate cylinder. is there.

[0005] Since the present swing of the doctor blade reciprocates in the axial direction of the plate cylinder, a stop point always occurs when the moving direction is switched, and the reciprocating range is limited. However, the setting of doctoring conditions was limited.

[0006] The present invention has been made in view of the above problems, and an object of the present invention is to provide a doctor device which has a simple structure, does not take up space, and has no restriction on setting of doctoring conditions. To provide.

[0007]

In order to achieve the above object, the present invention relates to a doctor device used in gravure printing, wherein the doctor blade itself is a belt type, and the doctor blade of the belt type is rotated and moved. It is characterized by having a mechanism for pressing against the plate cylinder.

[0008]

FIG. 1 is a plan view showing a main part of a doctor device according to the present invention, and FIG. 2 is a sectional view taken along line XX of FIG.

1 and 2, reference numeral 1 denotes an endless belt type doctor blade, 2 denotes a slide plate for assisting sliding of the doctor blade 1, 3 denotes a doctor holder for fixing the doctor blade 1 and the slide plate 2, and 4 denotes a doctor holder. A blade guide, 5 is a blade cover, 6 is a blade fixing bolt, and 7 is a holder handle. Also,
8 is a servomotor for driving the doctor blade 1, 9 is a driving pulley for rotating the doctor blade 1, 10 is a driven pulley with a tensioner mechanism for adjusting the tension of the doctor blade 1, and 11 is a tensioner support block. is there. In FIG. 1, the upper part of the rotating doctor blade 1 is cut away for clarity, and the blade cover 5 and the blade guide 4 therein are also omitted.
The blade cover 5 and the blade guide 4 have the same length as the slide plate 2 and the doctor holder 3.

The doctor blade 1 of the endless belt type has its lower portion held by a slide blade 2 (slide receiver) using a dry bearing or the like, and can slide with respect to the plate cylinder surface. . The sliding speed of the doctor blade 1 is controlled by a servo motor 8, and can be set to an arbitrary speed. The side that does not slide with the plate cylinder (upper part)
The doctor blade 1 is guided by a blade guide 4 to stabilize the blade trajectory, and is covered with a blade cover 5 to ensure safety. Further, by adjusting the blade tension with the pulley 10 having the tensioner mechanism, an appropriate doctoring state is created.

FIG. 3 is a plan view showing a setting state of the doctor device shown in FIG. 1, and FIG. 4 is a side view thereof.
In FIG. 4, F indicates a plate cylinder, and I indicates an impression cylinder.

To set the doctor device, as shown in FIGS. 3 and 4, the doctor holder 3 is attached to the doctor holding frame 12 of the printing press, and the doctor blade 1 is set.
Is in contact with the peripheral surface of the plate cylinder F. As in the conventional doctor device, the holder holding base 12 may be provided with a holder fixing holder 13, a doctor extension adjusting knob 14, an elevating arm 15 that enables elevating and turning, a doctor turning knob 16, and the like. For example, a conventional adjustment method can be used for setting.

If the shape of the doctor holder 3 is adjusted to the current doctor holding base, it can be used for the current doctor device.

Further, when the reciprocating operation of the doctor blade 1 is required, it can be dealt with only by switching the operation mode of the control for the servomotor 8 for driving the doctor blade 1.

The driving mechanism of the doctor blade 1 is as follows.
In addition to the drive by the friction between the doctor blade 1 which is an endless belt and the drive pulley 9, various drive modes as shown in FIG. 5 can be freely selected. FIG.
In the example shown in FIG.
a formed in parallel with each other, and a groove 9 meshed with the ridge 1a.
a is provided on the driving pulley 9. In the example shown in FIG. 5B, the holes 1b are formed in the doctor blade 1 in a line, and the projection 9b corresponding to the holes 1b is provided on the driving pulley 9. In the example shown in FIG. 5C, pins 1c are arranged in a row on the doctor blade 1 and the pins 1c are formed.
The driving pulley 9 is provided with a hole 9c matching c.

Further, as shown in FIG. 6, the doctor blade 1 may be of an open endless belt type, and the doctor blade 1 wound on the driven pulley 11 may be wound on the driving pulley 9.

The doctor device of the present invention is applicable to a converting device having a doctor, such as a gravure printing machine, as well as a gravure printing machine.

[0018]

As described above, according to the present invention, in a doctor device used for gravure printing, a mechanism in which the doctor blade itself is a belt type and the belt type doctor blade is pressed against the plate cylinder while rotating and moving. Since there is no need to have a mechanism to swing the doctor holding frame as in the conventional doctor device, it is possible to make a very simple configuration and secure the space around the doctor device. it can.

Further, the swing of the doctor blade only needs to change the rotational movement speed of the doctor blade.
The swing speed of the doctor blade can be set without being restricted by the rotation speed of the plate cylinder. Further, since there is no reciprocating motion due to swing as in the related art, there is no stop point when switching between left and right. Further, doctoring can be performed by reciprocating motion by swinging, and the swinging width at that time can be freely set.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a doctor device according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a plan view showing a setting state of the doctor device shown in FIG. 1;

FIG. 4 is a side view showing a setting state of the doctor device shown in FIG. 1;

FIG. 5 is an explanatory view illustrating another driving mode of the doctor blade.

FIG. 6 is a plan view showing a main part of a doctor device having an open endless type doctor blade.

[Explanation of symbols]

 1 Doctor Blade 2 Slide Plate 3 Doctor Holder 4 Blade Guide 5 Blade Cover 6 Blade Fixing Bolt 7 Holder Handle 8 Servo Motor 9 Drive Pulley 10 Follower Pulley 11 Tensioner Support Block 12 Holder Holder 13 Holder Holder 14 Dr. Adjustment knob 15 Lifting arm 16 Doctor turning knob F Plate cylinder I Impression cylinder

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomohisa Kida 1-1-1 Ichigaya Kagacho, Shinjuku-ku, Tokyo F-term in Dai Nippon Printing Co., Ltd. (reference) 2C034 CA02 CA10

Claims (1)

[Claims] 1. A doctor device used in gravure printing, wherein the doctor blade has a belt type, and has a mechanism for pressing the belt type doctor blade against a plate cylinder while rotating the doctor blade.