Cleaning mechanism for impression cylinder of sheet-fed offset press, impression cylinder device with cleaning mechanism and cleaning method

Abstract

A cleaning mechanism for an impression cylinder of a sheet-fed offset press comprises a supporting frame and a machine body arranged in the supporting frame, and is characterized in that the machine body is elastically arranged in the supporting frame and can ascend and descend; a driving source and a pressing rod connected with the power output end of the driving source are arranged on the machine body, and the driving source can drive the pressing rod to stretch out and draw back. The invention further discloses an impression cylinder device and a cleaning method. The machine body can automatically avoid the gripper bar higher than the circumferential surface in the impression cylinder through cooperation of the protruding block and the pressing rod, reliability and stability are achieved, the implementation cost is low, and popularization is facilitated.

Description

Technical Field

[0001] The invention relates to a cleaning device, in particular to a cleaning device applied to an impression cylinder of a sheet-fed offset printing press. The invention also relates to an impression cylinder of a sheet-fed offset printing press and a cleaning method of the impression cylinder. Background Art

[0002] Figure 1 and Figure 2 The present invention is an impression cylinder device of a sheet-fed offset printing machine in the prior art, which includes an impression cylinder 2a and a machine wallboard 1a. The machine wallboard 1a is divided into two pieces and arranged at intervals. The impression cylinder 2a can be rotatably arranged between the machine wallboards 1a. Two raised circumferential surface tooth rows 3a are installed on the circumference of the impression cylinder 2a. The tooth rows 3a are used to hold paper. For related literature, please refer to the Chinese utility model patent "An Impression Cylinder of a Coding Printing Machine" with patent number ZL201920198396.3 (authorization announcement number CN210026693U).

[0003] After the impression cylinder of a sheet-fed offset printing press has been working for a certain period of time, its circumferential surface will be contaminated with ink and dirt, thus affecting the quality of printed products. Therefore, it is required to clean the circumferential surface of the impression cylinder in a timely manner. Since the impression cylinder has a different structure from the rubber cylinder, it has an additional raised tooth row on the circumferential surface. Therefore, the existing rubber cylinder cleaner used to clean the impression cylinder of a sheet-fed offset printing press has the disadvantage that the tooth row may damage the cleaning cloth.

[0004] At present, the surface cleaning of the impression cylinder of a sheet-fed offset printing press is still done manually by wiping it with a cleaning cloth, which is not only inefficient, time-consuming, and has a harsh manual working environment, but also very unsafe. As an improvement, there is a circuit control in the prior art to achieve a cleaning design with a tooth row avoidance, but it is costly and prone to failure. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a cleaning mechanism for the impression cylinder of a sheet-fed offset printing press which can avoid the tooth row in view of the above-mentioned technical status quo.

[0006] The second technical problem to be solved by the present invention is to provide a cleaning mechanism for the impression cylinder of a sheet-fed offset printing press which is low in cost and stable and reliable.

[0007] The third technical problem to be solved by the present invention is to provide a stable and reliable method for cleaning the impression cylinder device of a sheet-fed offset printing press.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: a cleaning mechanism for the impression cylinder of a sheet-fed offset printing machine, comprising a support frame and a machine body arranged in the support frame, characterized in that the machine body is elastically arranged in the support frame and can be raised and lowered; a driving source and a pressure rod connected to the power output end of the driving source are arranged on the machine body, and the driving source can drive the pressure rod to extend and retract. The pressure rod contacts the convex block on the impression cylinder only when the impression cylinder is in a state of being cleaned.

[0009] Preferably, the machine body is elastically arranged in the supporting frame via a spring.

[0010] Preferably, the driving source is a cylinder or a motor.

[0011] Furthermore, a roller is provided at the head of the pressure rod, and the top surface of the roller is higher than the upper end surface of the pressure rod. The roller cooperates with the convex block on the impression cylinder to reduce wear.

[0012] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: a pressing roller device having a cleaning mechanism for the pressing roller of a single-sheet offset printing press, characterized in that it includes a pressing roller and a cleaning mechanism arranged below the pressing roller, the aforementioned pressing roller has a tooth row, and protrusions are arranged on both sides close to the tooth row, and the protrusions cooperate with the extended pressure rod to drive the machine body to descend so that the machine body avoids the tooth row during cleaning.

[0013] Furthermore, the embossing roller can be rotatably arranged between two spaced-apart machine wall panels, the machine body has two spaced-apart mounting plates, the supporting frames are two pieces and are arranged on the inner side of the corresponding machine wall panels, and the aforementioned mounting plates can be raised and lowered in the supporting frames.

[0014] At least one of the machine wall panels is provided with a through hole near the support frame, and the machine body can be laterally separated from the support frame and pulled out from one side of the machine wall panel through the through hole. Compared with front installation and removal, the side pull-out design is not limited by the space under the impression roller, which is more conducive to the installation and removal of the machine body. At the same time, the impression roller will not be touched during the operation, so it is highly safe.

[0015] The support frame is provided with a guide rail, and correspondingly, the lower end surface of the mounting plate has a guide groove adapted to the guide rail.

[0016] The bottom of the support frame has an installation slot with an upward port, a spring is arranged in the installation slot, and the lower end surface of the guide rail is provided with a cushion block, which abuts against the top of the spring. The combination of the guide fit and the elastic setting of the body can make the body installation more convenient and firm.

[0017] The technical solution adopted by the present invention to solve the third technical problem is: a cleaning method for an impression roller device, characterized in that the machine body is provided with a cleaning cloth and a pressure strip for driving the cleaning cloth to press the surface of the impression roller, comprising the following steps:

[0018] ① Turn on the cleaning switch in the impression roller device;

[0019] ② The pressure rod is displaced below the circumference of the bump under the action of the driving source;

[0020] ③The cleaning cloth of the cleaning mechanism is closely attached to the surface of the impression cylinder under the action of the pressure strip;

[0021] ④Start the impression roller to enter the cleaning speed and rotate, and the impression roller is cleaned;

[0022] ⑤ When the convex block on the impression roller rotates with the impression roller to the top of the pressure rod, the convex block acts on the pressure rod, and the pressure rod pushes the body downward after receiving the force. At this time, the cleaning cloth and the pressure strip move downward with the body, thereby avoiding the teeth row on the impression roller; when the convex block rotates with the impression roller and leaves the pressure rod, the cleaning mechanism is reset under the action of elasticity, and the cleaning cloth of the cleaning mechanism continues to press the surface of the roller to scrub;

[0023] ⑥ When the set cleaning program is completed, the cleaning cloth and pressure strip in the cleaning mechanism are reset; the pressure rod is also reset to the non-cleaning position, and the cleaning is completed.

[0024] Compared with the prior art, the advantages of the present invention are: when the convex block on the impression roller rotates with the impression roller to the top of the pressure rod, the convex block acts on the pressure rod, and the pressure rod pushes the machine body downward after receiving the force, thereby avoiding the teeth row on the impression roller; when the convex block rotates with the impression roller and leaves the pressure rod, the machine body is reset under the action of elasticity, and the cleaning cloth of the cleaning mechanism continues to press the surface of the roller to scrub. The cooperation between the convex block and the pressure rod can allow the machine body to automatically avoid the teeth row on the impression roller that is higher than the circumferential surface, which is reliable and stable, and has a low implementation cost, which is conducive to promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural diagram of an impression roller device in the prior art.

[0026] Figure 2 for Figure 1 Magnified view of the separate impression cylinder.

[0027] Figure 3 It is a schematic diagram of the structure of an embodiment.

[0028] Figure 4 for Figure 3 A magnified view of the machine with the wall panels removed.

[0029] Figure 5 for Figure 4Enlarged view of the cleaning mechanism.

[0030] Figure 6 This is an exploded view of the cleaning mechanism.

[0031] Figure 7 It is a schematic diagram of the state when the pressure rod is extended. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below with reference to the accompanying drawings.

[0033] like Figure 3-4 As shown, the impression roller device with a cleaning mechanism in this embodiment is applied to a sheet-fed offset printing machine, and specifically includes a machine wall panel 1, an impression roller 2 and a cleaning mechanism arranged below the impression roller 2. The impression roller 2 can rotate between two spaced-apart machine wall panels 1. The impression roller 2 has two tooth rows 21 (one of which is not shown), and protrusions 22 are provided on both sides close to the tooth rows 21.

[0034] Combination Figure 5 and Figure 6 As shown, the cleaning mechanism includes a support frame 31 and a body 3 disposed in the support frame 31, Figure 7 As shown, a driving source 34 and a pressure rod 342 connected to the power output end of the driving source 34 are respectively provided on both sides of the machine body 3, and the driving source 34 can drive the pressure rod 342 to extend and retract. The driving source 34 is arranged on the mounting plate 33 of the machine body 3 through a support 341. A roller 343 is provided at the head of the pressure rod 342, and the top surface of the roller 343 is higher than the upper end surface of the pressure rod 342 so as to abut against the protrusion 22. The driving source 34 in this embodiment is a cylinder. The protrusion 22 cooperates with the extended pressure rod 342 to drive the machine body 3 to descend and avoid the tooth row 21.

[0035] The machine body 3 has two installation plates 33 arranged at intervals, and a guide rail 32 is provided on the support frame 31 . Correspondingly, the lower end surface of the installation plate 33 has a guide groove adapted to the guide rail 32 .

[0036] The support frame 31 is composed of two pieces and is arranged on the inner side of the corresponding machine wall panel 1 through a connecting pin 37. The machine body 3 is elastically arranged on the corresponding support frame 31 and can be raised and lowered. Specifically, the bottom of the support frame 31 has a mounting groove 311 with the port facing upward, and the spring 42 is placed in the mounting groove 311. The lower end surface of the guide rail 32 is provided with a cushion block 41 through an axle pin 43, and the cushion block 41 abuts against the top of the spring 42. In this way, the guide rail 32 and the mounting plate 33 are guided and matched and abut against each other, so that the machine body 3 is elastically arranged. The machine body 3 is provided with a cleaning cloth 35 and a pressure strip 36 that drives the cleaning cloth 35 to press the surface of the impression cylinder 2.

[0037] The machine wall panel 1 is provided with a through hole 11 near the support frame 31, and the machine body 3 can be laterally separated from the support frame 31 and pulled out from one side of the machine wall panel 1 through the through hole 11. A stop block 38 is provided on the mounting plate 33 so that the machine body 3 can be accurately placed on the support frame 31. When the machine body 3 is installed, it acts downward on the guide rail 32, the spring 42 is compressed, and the machine body 3 is pushed through the through hole 11, and the installation can be easily completed. After installation, the machine body 3 and the support frame 31 are tightly matched due to the action of the spring 42 in the vertical direction, and the stop block 38 is set to limit the position in the horizontal direction. When disassembling, the stop block 38 is first removed to overcome the spring elastic force and pull out the machine body from the side of the machine wall panel.

[0038] The cleaning process includes the following steps:

[0039] ① Turn on the cleaning switch in the impression roller device;

[0040] ② The pressure rod 342 is displaced below the circumference of the protrusion 22 under the action of the driving source 34;

[0041] ③ The cleaning cloth 35 of the cleaning mechanism is in close contact with the surface of the impression cylinder 2 under the action of the pressure strip 36;

[0042] ④ Start the impression cylinder 2 to rotate at a cleaning speed, and the impression cylinder 2 is cleaned;

[0043] ⑤ When the convex block 22 on the impression cylinder 2 rotates with the impression cylinder 2 to the top of the pressure rod 342, the convex block 22 acts on the pressure rod 342, and the pressure rod 342 pushes the machine body 3 downward after receiving the force, and at this time, the cleaning cloth 35 and the pressure strip 36 move downward with the machine body 3, thereby avoiding the tooth row 21 on the impression cylinder 2; when the convex block 22 rotates with the impression cylinder 2 and leaves the pressure rod 342, the machine body 3 is reset under the action of elasticity, and the cleaning cloth 35 of the cleaning mechanism continues to press the surface of the cylinder to scrub;

[0044] ⑥ When the set cleaning program is completed, the cleaning cloth 35 and the pressure bar 36 in the cleaning mechanism are reset; the pressure rod 342 is also reset to the non-cleaning position, the cleaning is completed, and the next cleaning instruction is waited for, and the above action is repeated.

Claims

1. A cleaning mechanism for an impression cylinder of a sheet-fed offset printing press, comprising a support frame (31) and a body (3) arranged in the support frame (31), characterized in that The machine body (3) is elastically arranged in the support frame (31) and can be raised and lowered; the machine body (3) is provided with a driving source (34) and a pressure rod (342) connected to the power output end of the driving source (34), and the aforementioned driving source (34) can drive the pressure rod (342) to extend and retract.

2. The cleaning mechanism for the impression cylinder of a sheet-fed offset printing press according to claim 1, characterized in that The machine body (3) is elastically arranged in the supporting frame (31) via a spring (42).

3. The cleaning mechanism for the impression cylinder of a sheet-fed offset printing press according to claim 1, characterized in that The driving source (34) is a cylinder or a motor.

4. The cleaning mechanism for the impression cylinder of a sheet-fed offset printing press according to claim 1, characterized in that The head of the pressure rod (342) is provided with a roller (343), and the top surface of the roller (343) is higher than the upper end surface of the pressure rod (342).

5. An impression cylinder device having a cleaning mechanism for an impression cylinder of a sheet-fed offset printing press according to any one of claims 1 to 4, characterized in that The invention comprises an impression roller (2) and a cleaning mechanism arranged below the impression roller (2), wherein the impression roller (2) has a tooth row (21), and protrusions (22) are arranged on both sides close to the tooth row (21), and the protrusions (22) cooperate with the extended pressure rod (342) to drive the machine body to descend so that the machine body avoids the tooth row (21) during cleaning.

6. The impression cylinder device according to claim 5, characterized in that The embossing roller (2) is rotatably arranged between two spaced-apart machine wall panels (1), the machine body (3) has two spaced-apart mounting plates (33), the supporting frame (31) is composed of two pieces and is arranged on the inner side of the corresponding machine wall panels (1), and the aforementioned mounting plates (33) are movably arranged in the supporting frame (31).

7. The impression cylinder device according to claim 6, characterized in that At least one of the machine wall panels (1) is provided with a through hole (11) near the support frame (31), and the machine body (3) can be laterally separated from the support frame (31) and pulled out from one side of the machine wall panel (1) through the aforementioned through hole (11).

8. The impression cylinder device according to claim 7, characterized in that The support frame (31) is provided with a guide rail (32), and correspondingly, the lower end surface of the mounting plate (33) has a guide groove adapted to the guide rail (32).

9. The impression cylinder device according to claim 8, characterized in that The bottom of the support frame (31) is provided with a mounting groove (311) with the port facing upwards, a spring (42) is arranged in the mounting groove (311), and a cushion block (41) is arranged on the lower end surface of the guide rail, and the cushion block abuts against the top end of the spring (42).

10. A method for cleaning the impression cylinder device according to any one of claims 5 to 9, characterized in that The machine body (3) is provided with a cleaning cloth (37) and a pressing strip (36) for driving the cleaning cloth (37) to press against the surface of the impression roller (2), and comprises the following steps: ① Turn on the cleaning switch in the impression roller device; ② The pressure rod (342) is displaced below the circumference of the protrusion (22) under the action of the driving source (34); ③ The cleaning cloth (35) of the cleaning mechanism is in close contact with the surface of the impression cylinder (2) under the action of the pressure strip (36); ④ starting the impression roller (2) to rotate at a cleaning speed, and the impression roller (2) is cleaned; ⑤ When the convex block (22) on the impression roller (2) rotates with the impression roller (2) to the top of the pressure rod (342), the convex block acts on the pressure rod (342), and the pressure rod (342) pushes the machine body downward after receiving the force, and at this time, the cleaning cloth (35) and the pressure strip (36) move downward with the machine body, thereby avoiding the tooth row (21) on the impression roller (2); when the convex block (22) rotates with the impression roller (2) to leave the pressure rod (342), the machine body is reset under the action of elasticity, and the cleaning cloth of the cleaning mechanism continues to press the surface of the roller to scrub; ⑥ When the set cleaning program is completed, the cleaning cloth (35) and the pressure strip (36) in the cleaning mechanism are reset; the pressure rod (342) is also reset to the non-cleaning position, and the cleaning is completed.

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