A printing plate in and out device for a fully automatic plate changing system of an offset printing press

Abstract

The present invention discloses a printing plate entry and exit device of a fully automatic plate changing system of an offset printing press, comprising a plate box, a new plate hook mechanism and a plate retracting mechanism. The plate box is installed on the rear side of the two side wall panels of the offset printing press so as to switch back and forth from a vertical state to an inclined state. The plate box comprises a rectangular frame with an opening at the lower end formed by an upper baffle plate and two side baffle plates; the plate box is divided into a new plate bin and an old plate bin by an upper baffle plate, a middle baffle plate, a lower baffle plate and a plurality of inner support strips; an old printing plate exit port is provided on a side baffle plate corresponding to the old plate bin, and a new printing plate insertion port is provided corresponding to the new plate bin; the new plate hook mechanism is installed on the upper part of the new plate bin, and is used to hang the new printing plate in the new plate bin and realize the plate removal; the plate retracting mechanism is installed in the old plate bin, and is used to pull the old printing plate removed from the printing plate cylinder into the old plate bin. The printing plate entry and exit device of the present invention is not only easy to operate, but also can save costs and reduce the occurrence of plate changing failures.

Description

Technical Field

[0001] The invention relates to a printing plate in-and-out device of a full-automatic plate changing system of an offset printing press. Background Art

[0002] Offset printing cannot do without printing plates. Plate loading, plate calibration, and plate unloading are all necessary operations. The plate changing system is an important device in modern offset printing equipment. In the printing industry that pursues high speed, the speed of plate changing is becoming more and more the main factor affecting production efficiency. Large-scale printing does not require high plate changing, but with the fierce competition, large-scale printing business is becoming less and less, while the demand for small-batch, high-quality, and high-efficiency printing has increased dramatically. Compared with the increasingly shorter startup time, the proportion of preparation time such as loading and unloading printing plates and plate calibration in the production process of a single printing order is gradually increasing. At present, the automatic plate loading device on the market can be divided into two types: semi-automatic plate loading device and fully automatic plate loading device. The plate box of the current fully automatic plate changing device is on the top of the plate box during the insertion of the new plate and the withdrawal of the old plate. In this way, the operator needs to climb to a higher position, which is difficult to operate. At the same time, it is also necessary to add a higher footboard and safety guardrail. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a printing plate in-and-out device for a fully automatic plate changing system of an offset printing press, which is not only easy to operate, but also can save costs and reduce the occurrence of plate changing failures.

[0004] The object of the present invention is achieved as follows: a printing plate feeding and discharging device of a fully automatic plate changing system of an offset printing press comprises a plate box, a new plate hooking mechanism and a plate withdrawing mechanism, wherein:

[0005] The plate box is installed on the rear side of the two side wall panels of the offset printing machine so as to switch back and forth from a vertical state to an inclined state. The plate box includes a rectangular frame with an opening at the lower end formed by an upper baffle and two side baffles; a front upper frame plate, a front middle frame plate and a front lower frame plate are arranged horizontally on the front end surface of the frame, and a plurality of front support strips are arranged vertically; a rear upper frame plate, a rear middle frame plate and a rear lower frame plate are arranged horizontally on the rear end surface of the frame, and a plurality of rear support strips are arranged vertically; an upper partition plate, a middle partition plate and a lower partition plate are arranged horizontally in the middle part of the frame, and a plurality of inner support strips are arranged vertically, and the plate box is divided into a new plate bin located at the rear part of the plate box and an old plate bin located at the front part of the plate box by the upper partition plate, the middle partition plate, the lower partition plate and the plurality of inner support strips; an old printing plate exit port is opened on one side baffle corresponding to the old printing plate bin, and a new printing plate insertion port is opened on the corresponding new printing plate bin; three side positioning blocks are installed on the inner side surface of the other side baffle; a plurality of photoelectric sensors are respectively installed on the front end surface and the rear end surface of the inner support strip;

[0006] The new plate hook mechanism is installed on the upper part of the new plate bin, and the new plate hook mechanism includes a plate hanging shaft rotatably straddling between the upper parts of the two side baffles of the plate box, a hook installed on the plate hanging shaft, and a plate hanging cylinder installed on the upper part of the outer side surface of the other side baffle of the plate box and fixedly connected to one end of the plate hanging shaft through a plate hanging transition rod;

[0007] The plate withdrawing mechanism is installed in the old plate bin, and includes guide rails installed one-to-one on the upper inner side surfaces of the two side baffles of the plate box, sliders installed one-to-one on the pair of guide rails, a plate drawing shaft straddling the pair of sliders, a plurality of plate drawing structures fixedly installed on the plate drawing shaft at intervals, and plate drawing cylinders installed one-to-one at both ends of the front lower frame plate and hinged to both ends of the plate drawing shaft.

[0008] The above-mentioned printing plate entry and exit device of the fully automatic plate changing system of the offset printing press, wherein a damping mechanism is also installed in the middle of the new plate bin, and the damping mechanism includes a plurality of brackets installed at intervals on the rear end surface of the middle partition of the plate box, a pressure shaft rotatably spanning between the middle parts of the two side baffles of the plate box and passing through the plurality of brackets, a plurality of damping wheels installed on the pressure shaft at intervals and with staggered brackets, and a damping cylinder installed in the middle part of the outer side surface of the other side baffle of the plate box and fixedly connected to one end of the pressure shaft through a damping transition rod; a one-way bearing is installed on the wheel axle of the damping wheel.

[0009] The above-mentioned plate loading and unloading device of the fully automatic plate changing system of the offset printing press, wherein a plate guiding mechanism is arranged at the lower part of the old plate bin and the lower part of the new plate bin, and the plate guiding mechanism comprises a plurality of new plate guiding plates installed at intervals on the rear end surface of the lower partition plate, a plurality of new plate guiding wheels installed at intervals at the lower end of the inner support strips and a plurality of old plate guiding plates installed one-to-one at the lower ends of a plurality of the front support strips.

[0010] The printing plate in-and-out device of the fully automatic plate changing system of the offset printing press of the present invention has the following characteristics: by providing an old printing plate outlet and a new printing plate insertion port on the side of the plate box, the printing plate can be put into the plate box from the side, and the operator can complete the operation at the side without setting up a climbing device, which is not only convenient to operate but also can save costs. In addition, a photoelectric detection sensor is added in the plate box to reduce the occurrence of plate changing failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a printing plate in-and-out device of a fully automatic plate changing system of an offset printing press of the present invention;

[0012] Figure 2a It is a side view of a plate box in the printing plate feeding and discharging device of the present invention;

[0013] Figure 2bIt is a rear view of the plate box in the printing plate feeding and discharging device of the present invention;

[0014] Figure 3a It is a side view of a new plate hook mechanism in the printing plate feeding and discharging device of the present invention;

[0015] Figure 3b yes Figure 3a An enlarged view of the P site in FIG.

[0016] Figure 3c It is a rear view of a new plate hook mechanism in the printing plate feeding and discharging device of the present invention;

[0017] Figure 4a is a side view of a printing plate damping mechanism in a printing plate entry and exit device of the present invention;

[0018] Figure 4b It is a rear view of the printing plate damping mechanism in the printing plate entry and exit device of the present invention;

[0019] Figure 5a It is a rear view of the plate retracting mechanism in the printing plate feeding and discharging device of the present invention;

[0020] Figure 5b It is a side view of the plate retracting mechanism in the printing plate feeding and discharging device of the present invention;

[0021] Figure 5c yes Figure 5a AA view in the figure;

[0022] Figure 5d It is a side view of the state of the plate retracting mechanism in the printing plate feeding and discharging device of the present invention when the old printing plate is being unloaded. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] See also Figures 1 to 5d The printing plate entry and exit device of the fully automatic plate changing system of the offset printing press of the present invention comprises a plate box 2, a new plate hook mechanism 3, a side positioning mechanism, a damping mechanism 5, a printing plate guiding mechanism and a plate withdrawing mechanism 7.

[0025] The plate box 2 is installed on the frame plate 10 on the rear side of the two side wall panels 100 of the offset printing machine so that it can be switched back and forth from a vertical state to an inclined state through an automatic flipping mechanism; the plate box 2 includes a rectangular frame with an open lower end composed of an upper baffle plate 21, a left baffle plate 22 and a right baffle plate 23; the frame is made of aluminum alloy; a front upper frame plate 24a, a front middle frame plate 24b and a front lower frame plate 24c are horizontally arranged on the front end surface of the frame, and six front support bars 24 are vertically arranged at intervals; a rear upper frame plate 25a, a rear middle frame plate 25b and a rear lower frame plate 25c are horizontally arranged on the rear end surface of the frame, and six rear support bars 25 are vertically arranged at intervals; an upper partition plate 26a, a middle partition plate 26b and a The lower partition 26c is provided with three inner support bars 26 arranged vertically at intervals; the front support bar 24, the rear support bar 25 and the support bar 26 are all made of nylon, which can effectively prevent the printing plate from being scratched during movement; the plate box 2 is divided into a new plate bin 2A located at the rear of the plate box 2 and an old plate bin 2B located at the front of the plate box 2 by the upper partition 26a, the middle partition 26b and the lower partition 26c and the three inner support bars 26; an old plate exit is provided on the left baffle plate 22 corresponding to the old plate bin 2B, and a new plate insertion port is provided corresponding to the new plate bin 2A; a plurality of photoelectric sensors 27 are respectively installed on the front end face and the rear end face of an inner support bar 26 located in the middle and an inner support bar 26 located on the right.

[0026] The new plate hook mechanism 3 is installed on the upper part of the new plate bin 2A, and is used to hang the new printing plate 20A in the new plate bin 2A and realize plate removal; the new plate hook mechanism 3 includes a plate hanging shaft 30, a hook 31 and a plate hanging cylinder 33; wherein, the plate hanging shaft 30 is rotatably connected between the upper parts of the left baffle 22 and the right baffle 23 of the plate box 2; the hook 31 is installed on the plate hanging shaft 30 through the hook connecting plate 32; the plate hanging cylinder 33 is installed on the upper outer surface of the right baffle 23 of the plate box 2, and the end of the piston rod of the plate hanging cylinder 33 is hinged to one end of a plate hanging transition rod 34, and the other end of the plate hanging transition rod 34 is fixedly connected to one end of the plate hanging shaft 30.

[0027] The side positioning mechanism is installed on the inner side surface of the right baffle 23 of the plate box 2 and is located in the new plate bin 2A, so that the new printing plate 20A is positioned in the correct position of the new plate bin 2A; the side positioning mechanism includes three side positioning blocks 41, 42, and 43 fixed on the inner side surface of the right baffle 23, one of the side positioning blocks 41 is fixed to the upper part of the right baffle 23, and the other two side positioning blocks 42, 43 are closely fixed to the lower part of the right baffle 23.

[0028] The damping mechanism 5 is installed in the middle of the new plate bin 2A, and is used to control the speed at which the new printing plate 20A slides downward; the damping mechanism 5 includes two brackets 50, a pressing shaft 51, two damping wheels 52 and a damping cylinder 53; wherein the two brackets 50 are installed at intervals on the rear end surface of the middle partition 26b of the plate box 2; the pressing shaft 51 is rotatably connected between the middle of the left baffle 22 and the right baffle 23 of the plate box 2 and passes through the through holes opened at the lower ends of the two brackets 50; the two damping wheels 52 The brackets 50 are installed on the pressure shaft 51 at intervals and staggered. The two damping wheels 52 are made of polyurethane rubber, and one-way bearings are installed on the wheel axles so that the damping wheels 52 can only roll in one direction; the damping cylinder 53 is installed in the middle of the outer side surface of the right side baffle 23 of the plate box 2, and the end of the piston rod of the damping cylinder 53 is hinged to one end of a damping transition rod 54, and the other end of the damping transition rod 54 is fixedly connected to one end of the pressure shaft 51; one-way bearings are installed on the wheel axles of the two damping wheels 53.

[0029] The printing plate guiding mechanism is installed at the lower part of the old plate bin 2B and the lower part of the new plate bin 2A, and is used to guide the new printing plate 20A into the plate clamping gap of the plate cylinder 200 and to guide the old printing plate 20B into the old plate bin; the printing plate guiding mechanism includes two new plate guide plates 61, two new plate guide wheels 62 and six old plate guide plates 63; wherein, the two guide plates 61 are installed at intervals on the rear end surface of the lower partition 26c; the two new plate guide wheels 62 are installed at the lower end of an inner support bar 26 located on the left and the lower end of an inner support bar 26 located on the right; the six old plate guide plates 63 are installed one by one at the lower ends of the six front support bars 24.

[0030] The plate withdrawing mechanism 7 is installed in the old plate bin 2B, and is used to pull the old printing plate 20B into the old plate bin 2B; the plate withdrawing mechanism 3 includes a pair of guide rails 71, a pair of sliders 72, a plate pulling shaft 73, two plate pulling mechanisms 84 and a pair of plate pulling cylinders 70; wherein, the pair of guide rails 71 are installed one-to-one on the upper inner side surfaces of the left baffle 22 and the right baffle 23 of the plate box 2; the pair of sliders 72 are installed one-to-one on the pair of guide rails 81; the plate pulling shaft 73 is bridged on the pair of sliders 72; the two plate pulling mechanisms 74 are fixedly installed on the plate pulling shaft 73 one on the left and one on the right through the mounting blocks 740; a pair of plate pulling cylinders 70 are installed one-to-one on the rear end surfaces of the two ends of the front lower frame plate 24c, and the ends of the piston rods of the pair of plate pulling cylinders 70 are hinged to the two ends of the plate pulling shaft 73 one-to-one.

[0031] The printing plate in-and-out device of the fully automatic plate changing system of the offset printing press of the present invention, when installing a new printing plate: the plate box 2 is in a vertical state; the trailing side of the new printing plate 20A is manually folded in advance to ensure that the bending edges at both ends of the new printing plate 20A are accurately shaped; then, the trailing side of the new printing plate 20A is manually inserted into the new printing plate bin 2A from the new printing plate bin insertion port of the left baffle 22 of the plate box 2 and hung on the hook 31 of the new printing plate hook mechanism 3, and then the new printing plate 20A is manually pushed against the left end surfaces of the three side positioning blocks 41, 42, 43 to achieve the centering of the position of the new printing plate 20A. When the printing plate cylinder 200 needs to install a new printing plate 20A, the plate box 2 is converted into an inclined state through the automatic flipping mechanism. When the plate cylinder 200 is loaded with a new plate 20A, the piston rod of the plate hanging cylinder 33 of the new plate hook mechanism 3 extends, causing the plate hanging shaft 30 to rotate and driving the hook 31 to rotate to release the drag side of the new plate 20A; because the plate box 2 is tilted at a certain angle, under the guidance of the two new plate guide plates 61 and the two new plate guide wheels 62, the new plate 20A automatically slides to the predetermined position of the plate cylinder 200 under the action of gravity. During the sliding process of the new plate 20A, its sliding speed needs to be controlled by the damping mechanism 5. Before the plate box 2 is flipped and tilted, the piston rod of the damping cylinder 53 extends, causing the two damping wheels 52 to swing backward and lean against the new printing plate 20A, so that the new printing plate 20A is pressed against the surface of the rubber gasket 250 corresponding to the damping wheel 52 installed on the inner side of the rear support bar 25. Since the two damping wheels 52 are both equipped with one-way bearings, the damping wheels 52 can only roll along the sliding direction of the new printing plate 20A, and at the same time provide a certain resistance, which can control the sliding speed of the new printing plate 20A.

[0032] When the old printing plate 20B is unloaded: the plate box 2 is turned over and tilted to a specified position by the automatic turning device; then the printing plate cylinder 200 rotates to a certain angle, the plate clamp in the plate clamp notch 201 opens, and the trailing side of the old printing plate 20B pops out of the plate clamp notch 201; the printing plate cylinder 200 continues to rotate counterclockwise, and the old printing plate 20B is pushed and introduced into the old plate bin 2B through the six old plate guide plates 63; when the trailing side of the old printing plate 20B reaches the middle of the old plate bin 2B (see Figure 5d When the plate 20B is in position 1), the bent edge of the dragging side of the old printing plate 20B is pushed into the two plate pulling hooks 74 of the plate ejecting mechanism 7. At this time, the photoelectric sensor 27 in the old plate bin 2B detects the old printing plate 20B and sends a signal to extend the piston rod of the plate pulling cylinder 70 of the plate ejecting mechanism 7, pushing a pair of sliders 72 to move upward along a pair of guide rails 71, and then through the plate pulling shaft 73, the two plate pulling hooks 74 arrive at the upper part of the old plate bin 2B (see Figure 5d Position 2 in the middle), the two pull plate hooks 74 pull the old printing plate 20B completely away from the printing plate cylinder 200 and enter the old plate bin 2B, thus completing the unloading operation of the old printing plate 20B.

[0033] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A printing plate feeding and discharging device of a fully automatic plate changing system of an offset printing press, comprising a plate box, a new plate hooking mechanism and a plate withdrawing mechanism, characterized in that: The plate box is installed on the rear side of the two side wall panels of the offset printing machine so as to switch back and forth from a vertical state to an inclined state. The plate box includes a rectangular frame with an opening at the lower end formed by an upper baffle and two side baffles; a front upper frame plate, a front middle frame plate and a front lower frame plate are arranged horizontally on the front end surface of the frame, and a plurality of front support strips are arranged vertically; a rear upper frame plate, a rear middle frame plate and a rear lower frame plate are arranged horizontally on the rear end surface of the frame, and a plurality of rear support strips are arranged vertically; an upper partition plate, a middle partition plate and a lower partition plate are arranged horizontally in the middle part of the frame, and a plurality of inner support strips are arranged vertically, and the plate box is divided into a new plate bin located at the rear part of the plate box and an old plate bin located at the front part of the plate box by the upper partition plate, the middle partition plate, the lower partition plate and the plurality of inner support strips; an old printing plate exit port is opened on one side baffle corresponding to the old printing plate bin, and a new printing plate insertion port is opened on the corresponding new printing plate bin; three side positioning blocks are installed on the inner side surface of the other side baffle; a plurality of photoelectric sensors are respectively installed on the front end surface and the rear end surface of the inner support strip; The new plate hook mechanism is installed on the upper part of the new plate bin, and the new plate hook mechanism includes a plate hanging shaft rotatably straddling between the upper parts of the two side baffles of the plate box, a hook installed on the plate hanging shaft, and a plate hanging cylinder installed on the upper part of the outer side surface of the other side baffle of the plate box and fixedly connected to one end of the plate hanging shaft through a plate hanging transition rod; The plate withdrawing mechanism is installed in the old plate bin, and includes guide rails installed one-to-one on the upper inner side surfaces of the two side baffles of the plate box, sliders installed one-to-one on the pair of guide rails, a plate drawing shaft straddling the pair of sliders, a plurality of plate drawing structures fixedly installed on the plate drawing shaft at intervals, and plate drawing cylinders installed one-to-one at both ends of the front lower frame plate and hinged to both ends of the plate drawing shaft.

2. The printing plate in-and-out device of the fully automatic plate changing system of the offset printing press according to claim 1, characterized in that: A damping mechanism is also installed in the middle of the new plate bin, which includes a plurality of brackets installed at intervals on the rear end surface of the middle partition of the plate box, a pressure shaft rotatably spanning between the middle parts of the two side baffles of the plate box and passing through a plurality of brackets, a plurality of damping wheels installed on the pressure shaft at intervals and with staggered brackets, and a damping cylinder installed in the middle of the outer side surface of the other side baffle of the plate box and fixedly connected to one end of the pressure shaft through a damping transition rod; a one-way bearing is installed on the wheel axle of the damping wheel.

3. The printing plate in-and-out device of the fully automatic plate changing system of an offset printing press according to claim 1, characterized in that: A printing plate guiding mechanism is arranged at the lower part of the old plate bin and the lower part of the new plate bin, and the printing plate guiding mechanism includes a plurality of new plate guiding plates installed at intervals on the rear end surface of the lower partition, a plurality of new plate guiding wheels installed at intervals at the lower end of the inner support strips, and a plurality of old plate guiding plates installed one by one at the lower end of the plurality of the front support strips.

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