Precise positioning mechanism for cam of paper conveying / impression cylinder

Abstract

The utility model relates to an accurate cam positioning mechanism for a paper / impression cylinder, which is characterized in that shaft heads at two ends of the paper / impression cylinder are respectively and rotatably mounted on side plates on two sides, round holes for mounting the shaft heads are designed on the side plates, fixing sleeves are mounted in the round holes, bearings are mounted between the shaft heads and the fixing sleeves, and the bearings are connected with the paper / impression cylinder. One end of the fixing sleeve is fixed on the upper surface of the outer side of the side plate through a flange, and the other end of the fixing sleeve penetrates through the round hole and then is fixedly connected with a pressing cover used for pressing a bearing. The positioning sleeve is pressed on the outer side of the gland through the annular step and is axially positioned and fixed on the inner side of the side plate; and the sleeve-shaped cam is positioned and mounted at the end part of the other end of the positioning sleeve. The device has the advantages that the cam is mounted and positioned on the side plate through the independent positioning sleeve, so that the cam is separated from the fixing sleeve, the problem that the fixing sleeve deforms due to long-time stress is avoided, the mounting precision is ensured through the independently mounted cam, and the long-time use requirement of the printing machine is met.

Description

Technical Field

[0001] This utility model relates to the field of printing press manufacturing, specifically to a precise positioning mechanism for a paper / impression cylinder cam. Background Technology

[0002] In the past, during the operation of the paper feed / impression cylinder of a printing press, the gripper mechanism mounted on the cylinder moved along cams via rollers. The cams were traditionally fitted onto the outer side plates of the shaft ends on both sides of the cylinder. The shaft ends were rotatably mounted on the side plates via bearings, which were then fixed between the side plates and shaft ends by a retaining sleeve and a pressure cap. The pressure cap was fixedly connected to one end of the retaining sleeve, and the cam was mounted on the pressure cap. Before installation, the retaining sleeve and side plates needed to be precisely positioned to ensure the cam path accuracy met the operating requirements of the gripper mechanism. However, with prolonged use, the shaft ends would exert force on the retaining sleeve through the bearings, causing deformation of the retaining sleeve on the side plates and a shift in its center. This affected the positional accuracy of the cam mounted on the retaining sleeve, leading to unstable gripping and poor print quality. Regular adjustment of the retaining sleeve's installation position was necessary, which was time-consuming and labor-intensive. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this utility model proposes a precise positioning mechanism for the paper / impression cylinder cam, which is ingeniously designed and has a reasonable and compact structure to ensure the installation accuracy of the cam.

[0004] The technical solution of this utility model:

[0005] A precise positioning mechanism for a paper feed / impression cylinder cam is disclosed. The two ends of the paper feed / impression cylinder are rotatably mounted on side plates on both sides. The side plates have circular holes for mounting the shafts, and a fixing sleeve is installed within each hole. A bearing is installed between the shaft and the fixing sleeve. One end of the fixing sleeve is fixed to the outer side of the side plate via a flange, and the other end of the fixing sleeve passes through the circular hole and is fixedly connected to a pressure cap for pressing the bearing. The mechanism includes a sleeve-shaped cam and a positioning sleeve. One end of the positioning sleeve has an annular step, which presses against the outer side of the pressure cap, and the positioning sleeve is axially positioned and fixed to the inner side of the side plate. The sleeve-shaped cam is positioned and mounted at the other end of the positioning sleeve.

[0006] The sleeve-shaped cam includes a left half cam and a right half cam. The mating surfaces of the left half cam and the right half cam are designed as axially inclined surfaces. The left half cam and the right half cam are each designed with at least two mounting countersunk holes. The positioning sleeve is designed with a corresponding number of mounting threaded holes at corresponding positions. The left half cam and the right half cam are positioned and installed by bolts passing through the mounting countersunk holes and screwing them into the mounting threaded holes.

[0007] The inner side of the flange of the fixed sleeve is designed with an annular boss, and the inner side of the gland is also designed with an annular boss. The annular boss of the fixed sleeve and the annular boss of the gland fix and clamp the outer ring of the bearing from both sides. The inner side of the bearing's inner ring is pressed against the root step of the shaft head, and the outer side of the bearing's inner ring is fixed by rotating the thread on the outer side of the shaft head end with a lock nut.

[0008] The advantages of this utility model are its ingenious design and reasonable and compact structure. The cam is installed and positioned on the side plate by an independent positioning sleeve, so that the cam is disconnected from the fixed sleeve, avoiding the problem of deformation of the fixed sleeve under long-term force. The independently installed cam ensures the installation accuracy and meets the needs of long-term use of the printing press. Attached Figure Description

[0009] Figure 1 This is a simplified schematic diagram illustrating the application and use of this utility model.

[0010] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0011] Figure 3 yes Figure 2 Schematic diagram of a partial cross-section.

[0012] Figure 4 This is a schematic diagram of the positioning sleeve and sleeve-shaped cam of this utility model.

[0013] Figure 5 yes Figure 1 A diagram of the other side. Detailed Implementation

[0014] See attached document Figure 1-5 A precise positioning mechanism for a paper feed / impression cylinder cam is disclosed. The two ends of the paper feed / impression cylinder 1, shaft heads 2, are rotatably mounted on the side plates 3 on both sides. The side plates 3 are designed with circular holes for mounting the shaft heads 2. A fixing sleeve 4 is installed in the circular hole. A bearing 5 is installed between the shaft head 2 and the fixing sleeve 4. One end of the fixing sleeve 4 is fixed to the outer side of the side plate 3 by a flange. The other end of the fixing sleeve 4 passes through the circular hole and is fixedly connected to a pressure cover 6 for pressing the bearing 5. The pressure cover 6 includes a sleeve-shaped cam 7 and a positioning sleeve 8. One end of the positioning sleeve 8 is designed with an annular step. The positioning sleeve 8 is pressed against the outer side of the pressure cover 6 by the annular step and is axially positioned and fixed to the inner side of the side plate 3. The sleeve-shaped cam 7 is positioned and installed at the other end of the positioning sleeve 8.

[0015] The sleeve-shaped cam 7 includes a left half cam 71 and a right half cam 72. The mating surfaces of the left half cam 71 and the right half cam 72 are designed as axially inclined surfaces 73. At least two mounting countersunk holes are designed on each of the left half cam 71 and the right half cam 72. The positioning sleeve 8 has a corresponding number of mounting screw holes at corresponding positions on the mounting countersunk holes. The left half cam 71 and the right half cam 72 are positioned and installed by bolts passing through the mounting countersunk holes and screwing them into the mounting screw holes. The cam is designed as a two-half structure for easy installation and replacement. The axially inclined surfaces on the left and right half cams ensure smooth movement of the roller 10 traveling on the outer path of the cam, ensuring accurate paper gripping and improving printing quality.

[0016] The inner side of the flange of the fixing sleeve 4 is designed with an annular boss, and the inner side of the pressure cap 6 is also designed with an annular boss. The annular bosses of the fixing sleeve 4 and the pressure cap 6 clamp the outer ring of the bearing 5 from both sides. The inner side of the inner ring of the bearing 5 is pressed against the root step of the shaft head 2, and the outer side of the inner ring of the bearing 5 is fixed by rotating the thread on the outer side of the end of the shaft head 2 through the locking nut 9. The fixing sleeve and pressure cap are used to fix and install the bearing, which is the prior art. This utility model is briefly introduced.

[0017] In use, the fixing sleeve is first installed in the round hole on the side plate through its flange. Then, the bearing is installed in the fixing sleeve, with one end of the bearing pressing against the annular boss on the inner side of the fixing sleeve. Next, the pressure cap is pressed against one end of the bearing through the annular boss and fixedly installed on the other end of the fixing sleeve. At this time, the positioning sleeve is positioned and installed inside the round hole of the side plate, with the annular step on the inner side of the positioning sleeve pressing against the outer side of the pressure cap. Then, the sleeve-shaped cam is precisely installed on the outer side of the positioning sleeve according to the positioning design. Finally, the shaft head passes through the sleeve-shaped cam, positioning sleeve, pressure cap, and fixing sleeve, with the root of the shaft head pressing against the outer side of the inner ring of the bearing. The end of the shaft head passes through the other side of the inner ring of the bearing and is locked by screwing a lock nut onto the thread on the end of the shaft head.

Claims

1. A precise positioning mechanism for a paper feed / impression cylinder cam, wherein the two ends of the paper feed / impression cylinder are rotatably mounted on side plates on both sides, the side plates are designed with circular holes for mounting the shafts, a fixing sleeve is installed in the circular hole, a bearing is installed between the shaft and the fixing sleeve, one end of the fixing sleeve is fixed to the outer side of the side plate by a flange, and the other end of the fixing sleeve passes through the circular hole and is fixedly connected to a pressure cap for pressing the bearing, characterized in that... It includes a sleeve-shaped cam and a positioning sleeve. One end of the positioning sleeve is designed with an annular step. The positioning sleeve is pressed against the outside of the pressure cover by the annular step and is axially positioned and fixed to the inside of the side plate. The sleeve-shaped cam is positioned and installed at the other end of the positioning sleeve.

2. The paper / impression cylinder cam precision positioning mechanism according to claim 1, characterized in that, The sleeve-shaped cam includes a left half cam and a right half cam. The mating surfaces of the left half cam and the right half cam are designed as axially inclined surfaces. The left half cam and the right half cam are each designed with at least two mounting countersunk holes. The positioning sleeve is designed with a corresponding number of mounting threaded holes at corresponding positions. The left half cam and the right half cam are positioned and installed by bolts passing through the mounting countersunk holes and screwing them into the mounting threaded holes.

3. The paper / impression cylinder cam precision positioning mechanism according to claim 1, characterized in that, The inner side of the flange of the fixed sleeve is designed with an annular boss, and the inner side of the gland is also designed with an annular boss. The annular boss of the fixed sleeve and the annular boss of the gland fix and clamp the outer ring of the bearing from both sides. The inner side of the bearing's inner ring is pressed against the root step of the shaft head, and the outer side of the bearing's inner ring is fixed by rotating the thread on the outer side of the shaft head end with a lock nut.

Images