Electric anti-expansion device for a book printing press

Abstract

The utility model discloses a kind of electric anti-expansion devices for book printing machine, including bracing file bracket, two horizontal adjusting mechanisms and two compression wheel movement mechanisms.Bracing file bracket is fixed between the two wallboards of printing machine;Two horizontal adjusting mechanisms are installed on the surface of bracing file bracket oppositely;Every horizontal adjusting mechanism includes horizontal adjusting servo motor, horizontal adjusting lead screw and horizontal slider;Compression wheel movement mechanism includes speed reducer and compression wheel;Speed reducer is connected with compression wheel base by flange base, the main drive bevel gear connected with the rotating shaft of speed reducer, the driven bevel gear meshed with main drive bevel gear, a screw rod shaft inserted in the axle hole of driven bevel gear by key and a compression wheel bracket sleeved on screw rod shaft are equipped in this compression wheel base;Compression wheel is installed in the gap of the front end of compression wheel bracket;The compression wheel base of two compression wheel movement mechanisms is installed on two horizontal sliders one by one.The utility model has the characteristics of high adjustment accuracy and flexible adjustment.

Description

Technical Field

[0001] This utility model relates to an electric anti-expansion device for a book and periodical printing press. Background Technology

[0002] With the development of printing presses, and to meet the ever-changing needs of printing plants, various factors can lead to paper expansion during the printing process. For example, after each color unit is printed, the paper absorbs moisture from the printing plate, resulting in a fan-shaped expansion of the paper. This affects the registration accuracy of the newspaper, reduces printing efficiency and quality, and increases the scrap rate. To avoid paper expansion, anti-expansion mechanisms are usually installed in the printing press. Existing anti-expansion mechanisms (see...) Figure 1 The pressure adjustment requires manual adjustment of the handle 11 to drive the adjusting rod 12, which in turn is driven by the rotator 13 on the support frame 14 to swing the pressure roller 15 at the front end on the paper 16. The existing mechanical anti-expansion mechanism has the following disadvantages: 1. Low adjustment accuracy; 2. Inconvenient adjustment during printing press operation; 3. Cannot be coordinated with other automatic equipment for real-time adjustment. Utility Model Content

[0003] The purpose of this utility model is to overcome the defects of the prior art and provide an electric anti-expansion device for book and magazine printing machines. It has the characteristics of high adjustment efficiency, high adjustment accuracy, flexible adjustment and good pressure consistency. It effectively solves the problem of paper deformation caused by paper defects or water on the paper, thereby ensuring the accuracy of registration.

[0004] The purpose of this utility model is achieved as follows: an electric anti-expansion device for a book and periodical printing press, installed between every two adjacent printing units of an offset printing press, includes a support bracket, two lateral adjustment mechanisms, and two pressure roller movement mechanisms; wherein, The support bracket is fixed parallel to the printing cylinder of the printing unit between the two wall panels of the printing machine; Two lateral adjustment mechanisms are mounted opposite to each other on one surface of the support bracket; each lateral adjustment mechanism includes a lateral adjustment servo motor, a lateral adjustment screw connected to the rotating shaft of the lateral adjustment servo motor, and a lateral slider mounted on the lateral screw. The pressure roller motion mechanism includes a geared motor and a pressure roller; the geared motor is connected to a box-shaped pressure roller base via a flange seat. The pressure roller base contains a driving bevel gear connected to the shaft of the geared motor, a driven bevel gear meshing with the driving bevel gear, a lead screw shaft keyed into the shaft hole of the driven bevel gear, and a pressure roller bracket mounted on the lead screw shaft; the front end of the pressure roller bracket extends beyond the front end of the pressure roller base, and a notch is formed at the front end of the pressure roller bracket; the pressure roller is installed in the notch at the front end of the pressure roller bracket. The pressure roller bases of the two pressure roller motion mechanisms are installed one-to-one on the transverse sliders of the two transverse adjustment mechanisms.

[0005] The aforementioned electric anti-expansion device for a book and periodical printing press includes a geared motor comprising a servo motor and a reducer, wherein the shaft of the reducer is fitted with a drive bevel gear via a coupling.

[0006] In the aforementioned electric anti-expansion device for a book and periodical printing press, a guide sleeve with a sliding sleeve is also fixed inside the pressure roller base at the front of the pressure roller bracket.

[0007] The aforementioned electric anti-expansion device for a book printing press includes a rear bearing supporting the rear end of the lead screw shaft and a middle bearing supporting the middle part of the lead screw shaft and located in front of the driven bevel gear, which are also installed in the pressure roller base.

[0008] In the aforementioned electric anti-expansion device for a book and periodical printing press, the front end and rear end of the pressure roller base are respectively provided with a front end cover and a rear end cover.

[0009] The features of the electric anti-expansion device for book and periodical printing presses of this utility model are: 1. The pressure roller is pressed down and released from the paper by a servo motor, so that the pressure of the pressure roller on the paper reaches the optimal value and remains constant. It not only has the advantages of high adjustment efficiency, high adjustment accuracy, flexible adjustment and pressure consistency, but can also be adjusted in real time with other automatic equipment.

[0010] 2. By adjusting the servo motor laterally, the pressure roller movement mechanism can be adjusted so that the pressure roller presses down on the non-printing area of ​​the paper according to the printing width, thus avoiding the smudging caused by residual ink on the pressure roller.

[0011] 3. It effectively solves the problem of paper deformation caused by paper defects or water on the paper, thus ensuring accurate registration. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an electric anti-expansion device for a book and periodical printing press in the prior art; Figure 2 This is a schematic diagram of the structure of the electric anti-expansion device for a book and periodical printing machine according to this utility model; Figure 3 yes Figure 2 A bottom view; Figure 4 This is a schematic diagram of the pressure wheel motion mechanism in the electric anti-expansion device of this utility model. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Please see Figures 2 to 4 The electric anti-expansion device for a book and periodical printing machine of this utility model is installed between every two adjacent printing units of the offset printing machine and includes a support bracket 1, two lateral adjustment mechanisms 2 and two pressure roller movement mechanisms 3.

[0015] The support bracket 1 is fixed parallel to the printing cylinder 100 of the printing unit between two wall panels (not shown) of the printing press.

[0016] Two lateral adjustment mechanisms 2 are mounted opposite each other on one surface of the support bracket 1; each lateral adjustment mechanism includes a lateral adjustment servo motor 20, a lateral adjustment lead screw 21 connected to the rotating shaft of the lateral adjustment servo motor 20, and a lateral slider 22 mounted on the lateral lead screw 21.

[0017] The pressure roller motion mechanism 3 includes a geared motor and a pressure roller 39; the geared motor includes a servo motor 30 and a planetary reducer 31. The reducer 31 is connected to a pressure roller base 3B with a box structure via a flange seat 3A. The pressure roller base 3B is provided with a coupling 32 connected to the shaft of the reducer, a driving bevel gear 33 mounted on the coupling 32, a driven bevel gear 34 meshing with the driving bevel gear 33, a lead screw shaft 36 inserted into the shaft hole of the driven bevel gear 34 via a key 35, and a sleeve on the lead screw shaft 36. The pressure roller bracket 37 includes a guide sleeve 38 that slides on the front of the pressure roller bracket 37, a rear bearing 361 supported on the rear end of the lead screw shaft 36, and a middle bearing 362 that supports the middle of the lead screw shaft 36 and is located in front of the driven bevel gear 34. The front end of the pressure roller bracket 37 extends out of the front end of the pressure roller base 3B, and a notch is opened at the front end of the pressure roller bracket 37. The pressure roller 39 is installed in the notch at the front end of the pressure roller bracket 37. The front end and rear end of the pressure roller base 3B are provided with a front end cover 3a and a rear end cover 3b, which correspond to each other.

[0018] The pressure roller bases 3B of the two pressure roller motion mechanisms 3 are installed on the transverse sliders 22 of the two transverse adjustment mechanisms 2 in a one-to-one correspondence.

[0019] This utility model discloses an electric anti-expansion device for a book and magazine printing press. Based on the width of the printing paper 16, it controls the rotation of the lateral adjustment servo motors 20 of the two lateral adjustment mechanisms 2, adjusting the positions of the two pressure roller motion mechanisms 3 one-to-one, so that the pressure rollers 39 on the two pressure roller motion mechanisms 3 are in the non-printing position of the paper 16. Based on the printing effect, it controls the rotation of the servo motors 30 on the two pressure roller motion mechanisms 3, which drives the driven bevel gear 34 to rotate via the active bevel gear 33. The driven bevel gear 34 then drives the lead screw shaft 36 to rotate, thereby causing the pressure roller support 37 to move along the length of the lead screw shaft 36, ultimately adjusting the extension and retraction position of the pressure rollers 39, achieving pressure regulation of the pressure rollers 39 on the paper 16, and thus shrinking the paper 16. This ensures smooth paper feeding and accurate registration during printing, and reduces the impact of paper expansion on printing. Since the two pressure roller motion mechanisms 3 are independent, the pressure of each pressure roller 39 on the paper 16 can be controlled according to the actual expansion of the paper 16.

[0020] The above embodiments are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. An electric anti-expansion device for a book and periodical printing press, installed between every two adjacent printing units of an offset printing press and comprising a support bracket, two lateral adjustment mechanisms, and two pressure roller movement mechanisms; characterized in that, The support bracket is fixed parallel to the printing cylinder of the printing unit between the two wall panels of the printing machine; Two lateral adjustment mechanisms are mounted opposite to each other on one surface of the support bracket; each lateral adjustment mechanism includes a lateral adjustment servo motor, a lateral adjustment screw connected to the rotating shaft of the lateral adjustment servo motor, and a lateral slider mounted on the lateral screw. The pressure roller motion mechanism includes a geared motor and a pressure roller; the geared motor is connected to a box-shaped pressure roller base via a flange seat. The pressure roller base contains a driving bevel gear connected to the shaft of the geared motor, a driven bevel gear meshing with the driving bevel gear, a lead screw shaft keyed into the shaft hole of the driven bevel gear, and a pressure roller bracket mounted on the lead screw shaft; the front end of the pressure roller bracket extends beyond the front end of the pressure roller base, and a notch is formed at the front end of the pressure roller bracket; the pressure roller is installed in the notch at the front end of the pressure roller bracket. The pressure roller bases of the two pressure roller motion mechanisms are installed one-to-one on the transverse sliders of the two transverse adjustment mechanisms.

2. The electric anti-expansion device for a book and periodical printing press according to claim 1, characterized in that, The geared motor includes a servo motor and a reducer, and the shaft of the reducer is equipped with a drive bevel gear via a coupling.

3. The electric anti-expansion device for a book and periodical printing press according to claim 1, characterized in that, A sliding sleeve is also fixed inside the pressure roller base to the guide sleeve at the front of the pressure roller bracket.

4. The electric anti-expansion device for a book and periodical printing press according to claim 1, characterized in that, The pressure roller base also houses a rear bearing that supports the rear end of the lead screw shaft and a middle bearing that supports the middle part of the lead screw shaft and is located at the front of the driven bevel gear.

5. The electric anti-expansion device for a book and periodical printing press according to claim 1, characterized in that, The front and rear ends of the pressure roller base are each provided with a front cover and a rear cover.

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