JPH0664875U - Ink calling device - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to control the number of times the ink calling roller is called according to the area ratio of the image area of the plate. [Structure] An ink recalling roller 4 is provided between an ink source roller 2 and an ink reciprocating roller 3 so as to reciprocate. The operating solenoid 17 of the stopper 21 for stopping the swing of the ink calling roller 4 is deenergized by the control device 25 which stores the area ratio of the image area of the plate and the number of times of calling according to the printing speed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ink recalling device provided in an inking device of a printing unit.

[0002]

[Prior art]

 FIG. 2 shows a swinging device of an ink feeding roller provided in an inking device of a printing unit and a conventional calling number control mechanism. This inking device has an ink retrieving roller 4 which reciprocally swings between an ink source roller 2 and an ink reciprocating roller 3 provided in the ink fountain 1, and the ink source roller 2 is rotated intermittently or at a constant continuous low level. The ink taken out from the ink fountain 1 by the rotation is transferred to the ink reciprocating roller 3 by the rocking of the ink feeding roller 4, and is attached to the plate cylinder via a group of ink kneading rollers 5 connected to the ink reciprocating roller 3. Are supplied to the image area of the printing plate (neither is shown).

A mechanism 6 for swinging the ink feeding roller 4 is rotatably supported by the operating-side and drive-side ink frames, and serves as a swinging center, and both side shaft portions of the spindle 7 and one shaft end thereof. A pair of arms 8 and a lever 9 fixed to each other, and a cam 11 for driving a cam follower 10 rotatably attached to the front end of the lever 9; A pair of bearings 13 is mounted on the arm 8 and can rotate on the main shaft 7, which is composed of a driving device 12 including a rotating gear, a sprocket, and a chain, and rotatably supporting both shaft ends of the ink inking roller 4. As described above, the ink ejecting roller 4 is always attracted by the tension spring 15 attached to the fixed shaft 14 so as to come into contact with the ink source roller 2.

Therefore, when the cam 11 is rotated by the drive unit 12 according to the speed of the plate cylinder, the lever 9, the arm 8 and the bearing 13 swing around the main shaft 7, and the ink retrieving roller 4 and the ink source roller 2 and the ink are rotated. It reciprocates between the reciprocating rollers 3 according to the number of revolutions of the plate cylinder. Further, a pin 19 attached to a bolt 18 at an output end of a solenoid 17 fixed to the ink frame 16 is fitted therein, and a stopper 21 and a stopper 21 which swing about a fixed shaft 20 by the movement of the pin 19 and the fixed shaft. A spring 23 is provided between the first and second springs 22. When the solenoid 17 is excited, the stopper 21 descends to the lower position shown by the solid line, and the adjusting screw 24 attached to the stopper 21 presses the arm 8 to stop the reciprocating swing of the ink ejecting roller 4. When the solenoid 17 is demagnetized, the stopper 21 is pulled back by the spring 23 to move up to the upper position shown by the one-dot chain line, and the ink feeding roller 4 reciprocally swings.

[0005]

[Problems to be solved by the device]

 As described above, the number of reciprocal swings of the ink feeding roller (hereinafter referred to as the number of feedings) depends on the number of rotations of the plate cylinder, that is, the printing speed. To continue supplying ink. Therefore, only by adjusting the ink supply amount by adjusting the rotation amount of the ink source roller, there are cases where printing defects such as density decrease due to insufficient ink supply and scumming due to excessive supply occur.

In view of the above situation, the present invention controls the number of times the ink calling roller is called according to the area ratio of the image area of the printing plate, thereby making it possible to adjust the ink supply amount. The purpose is to provide a device.

[0007]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The present invention shows that the ink ejecting roller 4 reciprocates between an ink source roller 2 and an ink reciprocating roller 3. In the ink recalling device in which the swinging of the ink is stopped by the stopper 21 which is activated by the excitation and demagnetization of the solenoid 17, the solenoid 17 is controlled to change the area ratio of the image area of the plate and the number of recalls according to the printing speed. It is characterized in that it is demagnetized by the stored control device 25.

[0008]

[Action]

 According to the present invention, when the plate is placed in a portion for reading the area ratio of the image area of the plate of the controller by the above means, or when the area ratio of the image area is input to the controller, the controller having cpu , The number of times the ink calling roller is called according to the area ratio of the image area of the plate is printed from the memory that stores the number of times the ink calling roller is called, which is optimum for the area ratio of the read or input image area. Pick up the number of calls according to the speed and turn the solenoid on and off to reach the optimum number of calls for this ink call roller.

While the solenoid is in the OFF state, the ink feeding roller swings back and forth, and conversely, when the solenoid is in the ON state, the swing back and forth stops. Therefore, the number of times of calling changes when the ratio in the ON and OFF states is adjusted.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. 1. Reference numerals 1 to 24 in the drawing denote the same parts as those in the conventional example shown in FIG. Further, in the present invention, the control device 25 for exciting and deactivating the solenoid 17 is provided, and therefore the control device 25 integrates the area of the image area of the plate to calculate the area ratio, and the image reading device 26. The memory 27 that stores the number of times the ink calling roller 4 is called according to the area ratio of the drawing area of the ink, and the ink calling roller 4 that is taken out from the memory 27 according to the drawing rate designated by reading or input. And a control unit 28 for controlling the solenoid 17 to be turned on and off so that the number of times the ink is called is increased. While the solenoid 17 is in the off state, the ink calling roller 4 includes the ink source roller 2 and the ink reciprocating roller 3. Between the plate cylinder is rotated p times per revolution of the plate cylinder, and while in the ON state, the rocking is stopped by q times of one revolution of the plate cylinder. = Pq round trips To do.

The reciprocating rocking frequency r has a constant value due to the driving device 12 and the cam 11 described above if the rotation speed of the plate cylinder is constant. Therefore, the number of times q to stop by controlling the solenoid 17 is controlled. When the adjustment is performed by the device 25, the number of times r the ink is called by the ink calling roller 4 changes.

[0012]

[Effect of device]

 As described above, according to the present invention, the operation solenoid of the stopper that stops the swing of the arm that supports the ink feeding roller stores the area ratio of the image area of the plate and the number of times of calling according to the printing speed. When the area ratio of the image area and the printing speed are input, the number of reciprocating oscillations of the inking roller, that is, the ringing, is input according to the area ratio and the printing speed. The number of times is controlled, and the ink supply amount can be adjusted, which has the effect of eliminating printing problems such as density reduction due to insufficient ink supply or background stains due to excessive supply, which cannot be solved by adjusting the ink amount by the ink source roller.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a side view showing a conventional example.

[Explanation of symbols]

 2 Ink source roller 3 Ink reciprocating roller 4 Calling roller 17 Solenoid 21 Stopper 25 Control device

Claims (1)

[Scope of utility model registration request] 1. An ink retrieving device in which the swing of an ink retrieving roller that reciprocates between an ink source roller and an ink reciprocating roller is stopped by a stopper that operates by excitation / demagnetization of the solenoid. An ink recalling device is characterized in that the control unit that stores the area ratio of the image area of the plate and the number of recalls according to the printing speed is demagnetized.