Semi-automatic plate loading system for printing presses

Abstract

The present invention relates to a semi-automatic plate loading system of a printing machine, belonging to the technical field of printing equipment, comprising a printing cylinder, a first printing clamping system, a second printing clamping system, a rotary pressure system and a unilateral pre-pressing system, wherein an installation cavity is arranged in the printing cylinder, the first printing clamping system can be pressed on a side of the second printing clamping system close to the rotation axis of the printing cylinder, the first printing clamping system and the second printing clamping system respectively press the side of the installation cavity, the rotary pressure system comprises a reciprocating air pumping device, a push air bag and an exhaust tension spring, the reciprocating air pumping device is installed in the installation cavity, the reciprocating air pumping device is connected with the push air bag, the push air bag is installed between the installation cavity and the first printing clamping system, the exhaust tension spring pulls the push air bag to exhaust when in a free state, the action force of the unilateral pre-pressing system causes the second printing clamping system to rotate toward the direction close to the rotation axis of the printing cylinder, the push air bag is transmission-connected with the first printing clamping system, thereby shortening the plate loading time.

Description

Technical Field

[0001] The invention relates to the technical field of printing presses, in particular to a semi-automatic plate loading system of a printing press. Background Art

[0002] The printing plate is installed on the printing cylinder, and the printing cylinder and the rubber roller rotate in coordination with each other, so that the paper passes between the printing plate and the rubber roller and is printed. Plate loading is the preparatory link of the printing process. The printing plate is installed on the printing cylinder and arranged and adjusted according to the order of the page numbers, the color and clarity of the prints, and the pressure of the printing press.

[0003] The existing plate loading method is to first clamp one end of the printing plate, clamp and install one end of the printing plate on the printing cylinder, then start the printing cylinder to rotate the printing cylinder, the printing plate rotates with the printing cylinder and then the rubber roller squeezes the printing plate, adjust the position of the printing plate, then operate the printing cylinder to stop rotating, and then clamp and install the other side of the printing plate. In this way, the clamping needs to be divided into two steps, and the printing cylinder needs to stop rotating and then start the printing cylinder, which is cumbersome and troublesome. Summary of the invention

[0004] In order to overcome the technical defects of the prior art, the present invention provides a semi-automatic plate loading system for a printing press, which realizes semi-automatic plate loading and shortens the plate loading time.

[0005] The technical solution adopted by the present invention is:

[0006] The semi-automatic plate loading system of the printing press comprises a printing cylinder, a first printing clamping system, a second printing clamping system, a rotary pressure system and a unilateral pre-pressing system. The printing cylinder is provided with a mounting cavity. The first printing clamping system and the second printing clamping system can be rotatably mounted in the mounting cavity. The first printing clamping system can be pressed on the side of the second printing clamping system close to the rotation axis of the printing cylinder. The first printing clamping system and the second printing clamping system press the side of the mounting cavity respectively. The rotary pressure system is mounted in the mounting cavity of the printing cylinder. The rotary pressure system comprises a reciprocating air pumping device, a push air bag and an exhaust tension spring. The inflation device is installed in the installation cavity, and the reciprocating inflation device is connected to the pushing airbag. The pushing airbag is installed between the installation cavity and the first printing clamping system. The two ends of the exhaust tension spring are respectively installed in the installation cavity and outside the pushing airbag. When the exhaust tension spring is in a free state, it pulls the pushing airbag to exhaust. A pressure relief hole is provided on the pushing airbag. The unilateral pre-stressing system is a pre-stressing spring. The two ends of the pre-stressing spring are respectively installed on the installation cavity and the second printing clamping system. The action force of the pre-stressing spring makes the second printing clamping system rotate toward the side direction close to the nearest installation cavity. The pushing airbag is transmission connected with the first printing clamping system.

[0007] Preferably, a pressure relief valve is provided on the push airbag.

[0008] Preferably, the first printing clamping system includes a first rotating frame and a plurality of first extrusion plates, the first rotating frame is rotatably installed in the installation cavity, the first extrusion plates are installed on the first rotating frame, and the pushing airbag is transmission-connected to the first rotating frame.

[0009] Preferably, the second printing clamping system includes a second rotating frame and a plurality of second extrusion plates, the second rotating frame is rotatably installed in the installation cavity, the second extrusion plates are installed on the second rotating frame, the second rotating frame is transmission-connected to the pre-stressed spring, and the first printing clamping system is pressed on the second rotating frame.

[0010] Preferably, the reciprocating air pump device comprises a reciprocating air pump and an arc transition plate, the reciprocating air pump is installed in the installation cavity, and the arc transition plate is installed on the reciprocating air pump.

[0011] Preferably, the arc axis of the arc transition plate coincides with the rotation axis of the printing cylinder.

[0012] Preferably, the push airbag is provided with an air release port, and the air release port is equipped with an air release screw plug through a threaded pair.

[0013] Preferably, the exhaust tension spring pulls the push airbag to retract when the push airbag is not inflated.

[0014] The beneficial effects of the present invention are:

[0015] The printing cylinder is provided with an installation cavity, the first printing clamping system and the second printing clamping system are both rotatably installed in the installation cavity, the first printing clamping system is pressed on the side of the second printing clamping system close to the rotation axis of the printing cylinder, the first printing clamping system and the second printing clamping system respectively press the side of the installation cavity, the rotary pressure system is installed in the installation cavity of the printing cylinder, the rotary pressure system includes a reciprocating air pumping device, a push air bag and an exhaust tension spring, the reciprocating air pumping device is installed in the installation cavity, the reciprocating air pumping device is connected with the push air bag, the push air bag is installed between the installation cavity and the first printing clamping system, and the push air bag is installed between the installation cavity and the first printing clamping system. The airbag is transmission-connected to the first printing clamping system. The pushing airbag expands and pushes the first printing clamping system when the reciprocating inflation device inflates. The two ends of the exhaust tension spring are respectively installed in the installation cavity and outside the pushing airbag. When the exhaust tension spring is in a free state, it pulls the pushing airbag to exhaust air, thereby resetting the first printing clamping system. A pressure relief hole is provided on the pushing airbag to facilitate the resetting of the pushing airbag. The unilateral pre-stressing system is a pre-stressing spring. The two ends of the pre-stressing spring are respectively installed in the installation cavity and on the second printing clamping system. The action force of the pre-stressing spring causes the second printing clamping system to rotate toward the side direction close to the nearest installation cavity.

[0016] When loading the plate, first clamp one end of the printing plate on the second printing clamping system, and place the other end of the printing plate between the first printing clamping system and the mounting cavity. The pre-stressed compression spring drives the first printing clamping system to clamp one end of the printing plate. Then, as the printing cylinder rotates, the reciprocating air pumping device repeatedly inflates, and the push air bag is gradually inflated, thereby gradually pushing the first printing clamping system to rotate and clamp, clamping the other end of the printing plate and gradually clamping it. In the prior art, the printing cylinder cooperates with the rubber roller, and the printing plate is repeatedly squeezed and adjusted by the rubber roller in the process of following the rotation of the printing cylinder until the two ends of the printing plate are clamped by the first printing clamping system and the second printing clamping system respectively, thereby realizing semi-automatic plate loading and shortening the plate loading time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] Figure 2 for Figure 1 Enlarged schematic diagram at point A in the middle.

[0019] Figure 3 for Figure 1 Enlarged schematic diagram of point B in the middle.

[0020] Figure 4 It is a schematic cross-sectional view of the present invention.

[0021] Description of reference numerals:

[0022] 1. Printing cylinder; 11. Mounting cavity;

[0023] 2. First printing clamping system; 21. First rotary frame; 22. First extrusion plate;

[0024] 3. Second printing clamping system; 31. Second rotating frame; 32. Second squeezing plate; 33. Second lever arm;

[0025] 4. Rotary pressure system; 41. Reciprocating air pump; 411. Reciprocating air pump; 412. Arc transition plate; 42. Push air bag; 43. Exhaust tension spring;

[0026] 5. Single-side preloading system;

[0027] 6. Printing plate. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings:

[0029] like Figure 1 — Figure 4As shown, this embodiment provides a semi-automatic plate loading system of a printing press, including a printing cylinder 1, a first printing clamping system 2, a second printing clamping system 3, a rotary pressure system 4 and a unilateral pre-pressing system 5. The printing cylinder 1 is provided with a mounting cavity 11, and the first printing clamping system 2 and the second printing clamping system 3 can be rotatably mounted in the mounting cavity 11. The first printing clamping system 2 can be pressed on the side of the second printing clamping system 3 close to the rotation axis of the printing cylinder 1, so that the first printing clamping system 2 can push the second printing clamping system 3 to rotate. The first printing clamping system 2 and the second printing clamping system 3 respectively press the sides of the installation cavity 11, so that the printing plate 6 can be pressed on the two sides of the installation cavity 11 by the first printing clamping system 2 and the second printing clamping system 3 respectively, thereby fixing the printing plate 6. The rotary pressure system 4 is installed in the installation cavity 11 of the printing cylinder 1. The rotary pressure system 4 includes a reciprocating air pumping device 41, a push air bag 42 and an exhaust tension spring 43. The reciprocating air pumping device 41 is installed in the installation cavity 11. 1, the reciprocating air pumping device 41 is connected with the pushing airbag 42, and then the reciprocating air pumping device 41 guides the high-pressure gas to the pushing airbag 42, the pushing airbag 42 is installed between the installation cavity 11 and the first printing clamping system 2, the pushing airbag 42 is in transmission connection with the first printing clamping system 2, the pushing airbag 42 expands and pushes the first printing clamping system 2 when the reciprocating air pumping device 41 is inflated, and the two ends of the exhaust tension spring 43 are respectively installed in the installation cavity 11 and outside the pushing airbag 42, and the exhaust tension spring 43 pulls the pushing airbag 42 when it is in a free state The air is exhausted, thereby resetting the first printing clamping system 2. A pressure relief hole is provided on the pushing airbag 42 to facilitate the resetting of the pushing airbag 42 and also limit the pressure of the pushing airbag 42 to prevent the pushing airbag 42 from being burst. The unilateral pre-stressing system 5 is a pre-stressing spring, and the two ends of the pre-stressing spring are respectively installed on the mounting cavity 11 and the second printing clamping system 3. The action force of the pre-stressing spring causes the second printing clamping system 3 to rotate toward the side direction of the nearest mounting cavity 11, and then clamp one end of the printing plate 6, thereby realizing semi-automatic plate loading and shortening the plate loading time.

[0030] When installing the plate, first clamp one end of the printing plate 6 on the side wall of the second printing clamping system 3 and the installation cavity 11, and place the other end of the printing plate 6 between the first printing clamping system 2 and the other side wall of the installation cavity 11. The pre-compression spring drives the second printing clamping system 3 to clamp one end of the printing plate 6. Then, as the printing cylinder 1 rotates, due to the well-known structure in the prior art, the printing cylinder 1 cooperates with the rubber roller and rotates synchronously. The reciprocating air pumping device 41 repeatedly pushes the rubber roller to inflate, and the pushing airbag 42 gradually inflates, thereby gradually pushing the first printing clamping system 2 to rotate and clamp the other side of the printing plate 6, so as to clamp the other end of the printing plate 6 and gradually clamp it. In the prior art, the printing cylinder 1 cooperates with the rubber roller, and the printing plate 6 is automatically adjusted by the repeated squeezing of the rubber roller in the process of following the rotation of the printing cylinder 1 to fit the outer side of the printing cylinder 1 until the two ends of the printing plate 6 are clamped by the first printing clamping system 2 and the second printing clamping system 3 respectively.

[0031] Specifically, a pressure relief valve is provided on the push airbag 42 , and the pressure relief valve is installed on the pressure relief hole through a threaded pair, in order to prevent the pressure in the push airbag 42 from being too high.

[0032] Specifically, the first printing clamping system 2 includes a first rotating frame 21 and a plurality of first squeezing plates 22. The first rotating frame 21 is rotatably installed in the installation cavity 11. The first squeezing plates 22 are installed on the first rotating frame 21. The pushing airbag 42 is transmission-connected to the first rotating frame 21. Each first squeezing plate 22 directly cooperates with the side wall of the installation cavity 11 to clamp the printing plate 6.

[0033] Specifically, the second printing clamping system 3 includes a second rotating frame 31 and a plurality of second squeezing plates 32. The second rotating frame 31 is rotatably installed in the installation cavity 11, and the second squeezing plates 32 are installed on the second rotating frame 31. The second rotating frame 31 is connected to the preload spring through a second force arm 33 installed on the second rotating frame 31. The first printing clamping system 2 is pressed on the second rotating frame 31, and the clamping of the printing plate 6 undergoes three processes. The first process is that one end of the printing plate 6 is clamped by the second rotating frame 31 under the action of the preload spring; the second process is that the printing plate 6 then rotates with the printing cylinder 1 until the first rotating frame 21 clamps the other end of the printing plate 6; the third process is that the first rotating frame 21 presses the second rotating frame 31 under the push of the pushing airbag 42, so that the second rotating frame 31 continuously presses the printing plate 6 to ensure the clamping force.

[0034] Specifically, the reciprocating air pump device 41 includes a reciprocating air cylinder 411 and an arc transition plate 412. The reciprocating air cylinder 411 is installed in the installation cavity 11, and the arc transition plate 412 is installed on the reciprocating air cylinder 411. The arc axis of the arc transition plate 412 coincides with the rotation axis of the printing cylinder 1, ensuring smooth inflation.

[0035] Specifically, a deflation port is provided on the push airbag 42, and a deflation screw plug is installed on the deflation port through a threaded pair, so as to quickly release the high-pressure gas in the push airbag 42 when the printing plate 6 is replaced.

[0036] Specifically, the exhaust tension spring 43 pulls the push airbag 42 to retract when the push airbag 42 is not inflated, so as to facilitate the installation of the printing plate 6.

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. The semi-automatic plate loading system of the printing press is characterized by: It includes a printing cylinder, a first printing clamping system, a second printing clamping system, a rotary pressure system and a unilateral pre-pressure system, the printing cylinder is provided with an installation cavity, the first printing clamping system and the second printing clamping system can be rotatably installed in the installation cavity, the first printing clamping system presses on the side of the second printing clamping system close to the rotation axis of the printing cylinder, the first printing clamping system and the second printing clamping system press the side of the installation cavity respectively, the rotary pressure system is installed in the installation cavity of the printing cylinder, the rotary pressure system includes a reciprocating air pumping device, a push air bag and an exhaust tension spring, the reciprocating air pumping device is installed in the installation cavity, the reciprocating air pumping device is connected with the push air bag, the reciprocating air pumping device includes a reciprocating air pump and an arc transition plate, the reciprocating air pump is installed in the installation cavity, the arc transition plate is installed on the reciprocating air pump, the arc axis of the arc transition plate coincides with the rotation axis of the printing cylinder, the push air bag is installed between the installation cavity and the first printing clamping system, the first printing The brush clamping system includes a first rotating frame and a plurality of first extrusion plates, the first rotating frame is rotatably installed in the installation cavity, the first extrusion plate is installed on the first rotating frame, the pushing airbag is transmission-connected with the first rotating frame, the two ends of the exhaust tension spring are respectively installed in the installation cavity and outside the pushing airbag, the exhaust tension spring pulls the pushing airbag to exhaust when it is in a free state, and a pressure relief hole is provided on the pushing airbag, the unilateral pre-stressing system is a pre-stressing spring, the two ends of the pre-stressing spring are respectively installed in the installation cavity and on the second printing clamping system, the action force of the pre-stressing spring makes the second printing clamping system rotate toward the side direction close to the nearest installation cavity, the pushing airbag is transmission-connected with the first printing clamping system, the second printing clamping system includes a second rotating frame and a plurality of second extrusion plates, the second rotating frame is rotatably installed in the installation cavity, the second extrusion plate is installed on the second rotating frame, the second rotating frame is transmission-connected with the pre-stressing spring, and the first printing clamping system is pressed on the second rotating frame.

2. The semi-automatic plate loading system of a printing press according to claim 1, characterized in that: The push airbag is provided with a pressure relief valve.

3. The semi-automatic plate loading system of a printing press according to claim 1, characterized in that: The push airbag is provided with an air release port, and the air release port is equipped with an air release screw plug through a thread pair.

4. The semi-automatic plate loading system of a printing press according to claim 1, characterized in that: The exhaust tension spring pulls the push airbag to retract when the push airbag is not inflated.

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