Defective printed paste rejecting device of offset press

Abstract

The invention discloses a defective printed paste rejecting device of an offset press, which comprises a rack, four rack legs of the rack are connected with ground feet through threads, the rack is connected with a swinging unit, a power unit and a paper blocking unit, the power unit is arranged between the swinging unit and the paper blocking unit, the defective printed paste rejecting device further comprises a pressing plate unit, and the pressing plate unit is arranged on the rack on one side of the paper blocking unit. The defective printed paste rejecting device of the offset press is compact in structure, the occupied area is greatly reduced, and rejecting of printed pastes with different thicknesses and different widths can be met.

Description

Technical Field

[0001] The invention relates to the technical field of offset printing machine devices, in particular to a defective printed sheet rejecting device of an offset printing machine. Background Art

[0002] At present, the traditional printing industry is developing rapidly, the printing speed is constantly increasing, and the technology and auxiliary products of post-press equipment involved are also constantly innovating. There will be printing defects in the fish-scale continuous prints produced by traditional printing machines, so special waste rejection equipment is needed to reject the prints with printing defects. The existing waste rejection equipment is large in size, occupies a large area, and has low waste rejection efficiency.

[0003] The offset printing machine market urgently needs waste rejection equipment with high waste rejection efficiency, good stability and the ability to adapt to high-speed printing. Summary of the invention

[0004] The purpose of the present invention is to provide a defective printed sheet rejection device for an offset printing machine, which solves the problem of large volume of the existing rejection equipment.

[0005] The technical solution adopted by the present invention is: a defective print rejection device for an offset printing machine, including a frame, four frame legs of the frame are all connected to ground feet through threads, the frame is connected to a swing unit, a power unit and a paper stop unit, the power unit is arranged between the swing unit and the paper stop unit, and also includes a pressure plate unit, which is arranged on the frame on one side of the paper stop unit.

[0006] The technical solution of the present invention is also characterized in that: The swing unit includes a swing unit driven shaft and a swing unit power shaft, the swing unit driven shaft and the swing unit power shaft are rotatably connected to the frame, one end of the swing unit power shaft extends out of the frame, and the end of the swing unit power shaft extending out of the frame is sequentially connected to a reducer and a servo motor; a plurality of pulleys of the same number are fixedly connected to the swing unit driven shaft and the swing unit power shaft, and the corresponding pulleys on the swing unit driven shaft and the swing unit power shaft are connected by belts; it also includes two first cylinders, one end of each first cylinder is respectively hinged on the frame leg corresponding to the frame, the telescopic end of each first cylinder is respectively hinged with a connecting plate, each connecting plate is in a "Z" shape, the connecting plate is provided with a first rotating hole and a second rotating hole, the first rotating holes of the two connecting plates are rotatably connected with the swing unit driven shaft, the two connecting plates are respectively located at the two ends of the swing unit driven shaft, the second rotating holes of the two connecting plates are rotatably connected with the swing shaft, and the swing unit driven shaft and the swing shaft are connected by a plurality of groups of belt transmission units.

[0007] The power unit includes a first rotating shaft, a power unit driven shaft and a power unit power shaft. The first rotating shaft, the power unit driven shaft and the power unit power shaft are rotatably connected to the frame. One end of the power unit driven shaft extends out of the frame. The end of the power unit driven shaft extending out of the frame is sequentially connected to a reducer and a servo motor; the power unit driven shaft and the power unit power shaft are connected through a plurality of groups of belt transmission units, and the power unit driven shaft and the first rotating shaft are connected through a plurality of groups of belt transmission units.

[0008] The paper stop unit includes a paper stop unit screw shaft and a paper stop unit supporting shaft, which are rotatably connected to the frame, one end of the paper stop unit screw shaft extends out of the frame and is fixedly connected to a handwheel, half of the threads on the paper stop unit screw shaft are left-handed, and the other half of the threads on the paper stop unit screw shaft are right-handed; the paper stop unit screw shaft is threadedly connected to a pair of symmetrical paper stoppers, which are composed of a translational baffle section and a horn guide section, and the bottom surfaces of the two paper stoppers are in contact with the paper stop unit supporting shaft, and the two paper stoppers are arranged on both sides of the belt drive unit between the driven shaft of the power unit and the first rotating shaft.

[0009] The first rotating shaft, the paper blocking unit supporting shaft, the paper blocking unit screw shaft, the power unit driven shaft, the power unit power shaft, the swing unit driven shaft and the swing unit power shaft are connected to the frame in sequence.

[0010] The pressure plate unit includes a first right-angled plate and a second right-angled plate, which are fixed to the side of the frame by bolts, and are arranged between the paper-blocking unit support shaft and the paper-blocking unit screw shaft; it also includes a second cylinder, which is fixed to the first right-angled plate and aligned with the center line of the frame; it also includes a thin shaft, which is passed through the second right-angled plate, and the thin shaft and the telescopic rod of the second cylinder are jointly fixed with the pressure plate, and the angle between the pressure plate and the conveyor belt is an acute angle; it also includes a support plate, one end of the support plate is fixed to the frame, and the other end of the support plate is rotatably connected to the driven shaft of the power unit, and the support plate is arranged directly below the pressure plate.

[0011] The beneficial effects of the present invention are: The defective print rejection device of the offset printing machine of the present invention realizes the rejection of defective prints by arranging a pressure plate unit and a swing unit. When a defective print appears, the defective print passes through the pressure plate unit, and the pressure plate unit presses down to intercept the defective print and the non-defective print after the defective print. At the same time, the swing unit moves to make the defective print fall and finally achieve rejection. The device has a compact structure and greatly reduces the floor space. The rejection process is controlled by a servo electrode. The running speed can be adjusted according to needs to keep the sample route stable. While achieving rejection, the rejection efficiency is improved. The device has strong applicability and can meet the rejection of prints of different thicknesses and widths. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a schematic diagram of the overall structure of the defective printed sheet rejection device of the offset printing press of the present invention; Figure 2 It is a schematic diagram of the top view structure of the present invention; Figure 3 It is a schematic structural diagram of the connecting plate of the present invention.

[0013] In the figure: 1. foot, 2. frame, 3. first cylinder, 4. connecting plate, 501. first rotating shaft, 502. driven shaft of power unit, 503. power shaft of power unit, 504. driven shaft of swing unit, 505. power shaft of swing unit, 6. belt, 7. swing shaft, 8. pressure plate, 9. second cylinder, 10. thin shaft, 11. first right angle vertical plate, 12. second right angle vertical plate, 13. support plate, 14. hand wheel, 15. pulley, 16. screw shaft of paper stop unit, 17. paper stop paper, 18. supporting shaft of paper stop unit. DETAILED DESCRIPTION

[0014] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] like Figure 1-3 As shown, the present invention provides a defective print rejection device for an offset printing machine, including a frame 2, four frame legs of the frame are all connected with feet 1 through threads, the frame 2 is connected with a swing unit, a power unit and a paper stop unit, the power unit is arranged between the swing unit and the paper stop unit, and also includes a pressure plate unit, which is arranged on the frame 2 on one side of the paper stop unit.

[0016] like Figure 1-3 As shown, the swing unit includes a swing unit driven shaft 504 and a swing unit power shaft 505, the swing unit driven shaft 504 and the swing unit power shaft 505 are rotatably connected to the frame 2, one end of the swing unit power shaft 505 extends out of the frame 2, and the end of the swing unit power shaft 505 extending out of the frame 2 is sequentially connected to a reducer and a servo motor; the swing unit driven shaft 504 and the swing unit power shaft 505 are respectively fixed with a plurality of pulleys 15 of the same number, and the corresponding pulleys 15 on the swing unit driven shaft 504 and the swing unit power shaft 505 are connected by a belt 6 to perform printing and labeling transportation work; and also includes two first cylinders 3 One end of each first cylinder 3 is hinged on the frame leg corresponding to the frame 2, and the telescopic end of each first cylinder 3 is hinged with a connecting plate 4, each connecting plate 4 is in a "Z" shape, and the connecting plate 4 is provided with a first rotating hole 401 and a second rotating hole 402. The first rotating holes 401 of the two connecting plates 4 are rotatably connected with a swing unit driven shaft 504. The two connecting plates 4 are respectively located at the two ends of the swing unit driven shaft 504, and the second rotating holes 402 of the two connecting plates 4 are rotatably connected with a swing shaft 7. The swing unit driven shaft 504 and the swing shaft 7 are connected by a plurality of belt transmission units to perform printing and labeling transportation work.

[0017] like Figure 1 and Figure 2 As shown, the power unit includes a first rotating shaft 501, a power unit driven shaft 502 and a power unit power shaft 503. The first rotating shaft 501, the power unit driven shaft 502 and the power unit power shaft 503 are rotatably connected to the frame 2. One end of the power unit driven shaft 502 extends out of the frame 2. The end of the power unit driven shaft 502 extending out of the frame 2 is connected to a reducer and a servo motor in sequence; the power unit driven shaft 502 and the power unit power shaft 503 are connected by a plurality of belt transmission units for printing and labeling transportation, and the power unit driven shaft 502 and the first rotating shaft 501 are connected by a plurality of belt transmission units for printing and labeling transportation.

[0018] like Figure 1 and Figure 2 As shown, the paper stop unit includes a paper stop unit screw shaft 16 and a paper stop unit support shaft 18, the paper stop unit screw shaft 16 and the paper stop unit support shaft 18 are rotatably connected to the frame 2, one end of the paper stop unit screw shaft 16 extends out of the frame 2 and is fixedly connected to a hand wheel 14, the purpose of which is to realize the rotation of the paper stop unit screw shaft 16 by rotating the hand wheel, half of the threads on the paper stop unit screw shaft 16 are left-handed, and the other half of the threads on the paper stop unit screw shaft 16 are right-handed; the paper stop unit screw shaft 16 is connected to a pair of symmetrical The paper baffle 17, the two paper baffles 17 are respectively connected with threads of different rotation directions, so that the distance between the two paper baffles 17 can be adjusted by rotating the screw shaft 16 of the paper baffle unit, which can be suitable for printing plates of different widths. The paper baffle 17 is composed of a translation baffle section and a horn guide section. The bottom surfaces of the two paper baffles 17 are in contact with the paper baffle unit support shaft 18, which plays a supporting role for the two paper baffles 17. The two paper baffles 17 are arranged on both sides of the belt drive unit between the driven shaft 502 of the power unit and the first rotating shaft 501.

[0019] The first rotating shaft 501 , the paper blocking unit supporting shaft 18 , the paper blocking unit lead screw shaft 16 , the power unit driven shaft 502 , the power unit power shaft 503 , the swing unit driven shaft 504 and the swing unit power shaft 505 are sequentially connected to the frame 2 .

[0020] like Figure 1 and Figure 2As shown, the pressure plate unit includes a first right-angled vertical plate 11 and a second right-angled vertical plate 12, which are fixed to the side of the frame 2 by bolts, and the first right-angled vertical plate 11 and the second right-angled vertical plate 12 are arranged between the paper-blocking unit support shaft 18 and the paper-blocking unit screw shaft 16; it also includes a second cylinder 9, which is fixedly connected to the first right-angled vertical plate 11 and aligned with the center line of the frame 2; it also includes a thin shaft 10, which is passed through the second right-angled vertical plate 12, and the thin shaft 10 and the telescopic rod of the second cylinder 9 are jointly fixedly connected with the pressure plate 8, which plays a role in limiting the pressure plate 8, and the angle between the pressure plate 8 and the conveyor belt is an acute angle; it also includes a support plate 13, one end of the support plate 13 is fixedly connected to the frame 2, and the other end of the support plate 13 is rotatably connected to the driven shaft 502 of the power unit, and the support plate 13 is arranged directly below the pressure plate 8.

[0021] The working principle of the defective printed sheet rejection device provided by the present invention is as follows: at a fixed position, i.e., at the support plate 13, the defective printed sheet is pressed for a short time by the pressing plate unit composed of the pressing plate 8, the second cylinder 9, the thin shaft 10, the right-angled vertical plate 11, and the right-angled vertical plate 12, and then the upper belt 6 in the swing unit composed of the first cylinder 3, the connecting plate 4, and the swing shaft 7 is lifted, and finally the pressing stop unit is reset to release the defective printed sheet, and the defective printed sheet will fall along the belt 6 to the rejection paper feed belt or the rejection bin, completing the rejection process; after the rejection process, the connecting plate 4 in the pressing plate unit and the upper belt 6 in the lifted state are reset. The hand wheel 14, the paper stop unit screw shaft 16, the paper stop paper 17, and the paper stop unit support shaft 18 constitute the paper stop unit, which is used to align the fish scale printed sheets, avoid printed sheets placed at a large angle, and avoid paper blocking, which affects the rejection process.

[0022] The specific method is as follows: a waste rejection device control system in the field is installed, and after the waste rejection device control system reads the defect signal, its photoelectric sensor is immediately started to start counting; the position of the defective print is calculated according to the algorithm of the control system, and after the defective print passes through the pressing stop mechanism, the first cylinder 3 is controlled to start and press the defective print; after the pressing stop mechanism presses the print for about two seconds, the connecting plate 4 in the waste rejection mechanism and the belt 6 thereon are controlled to be lifted, and then the cylinder 3 in the pressing stop mechanism is controlled to be closed, so that the defective print enters the waste bin; when the control system cannot read the defect signal, the position of the last defective print is calculated according to the algorithm of the control system, and before it reaches the waste rejection mechanism, the connecting plate 4 and the belt 6 thereon are dropped and reset about 0.5 seconds in advance, so that the defect-free print enters the stacker or the subsequent paper feed belt through the paper feed belt; the swing unit is driven by a servo motor, which adapts to the host speed and adjusts the belt running speed in the waste rejection device during the waste rejection process, so as to realize the precise waste rejection function.

[0023] Example 1 like Figure 1As shown, the defective print rejection device of the offset printing machine proposed in this embodiment includes a frame 2, and the four frame legs of the frame are all connected with feet 1 through threads. The frame 2 is connected with a swing unit, a power unit and a paper stop unit, and the power unit is arranged between the swing unit and the paper stop unit. It also includes a pressure plate unit, and the pressure plate unit is arranged on the frame 2 on one side of the paper stop unit.

[0024] Example 2 like Figure 1 and Figure 2 As shown, the defective printed sheet rejection device of the offset printing machine proposed in this embodiment includes a frame 2, and the four frame legs of the frame are all connected to the ground feet 1 by threads. The frame 2 is connected with a swing unit, a power unit and a paper stop unit, and the power unit is arranged between the swing unit and the paper stop unit. It also includes a pressure plate unit, and the pressure plate unit is arranged on the frame 2 on one side of the paper stop unit. The swing unit includes a swing unit driven shaft 504 and a swing unit power shaft 505. The swing unit driven shaft 504 and the swing unit power shaft 505 are rotatably connected to the frame 2, and one end of the swing unit power shaft 505 extends out of the frame 2. The end of the swing unit power shaft 505 extending out of the frame 2 is connected to a reducer and a servo motor in sequence; the swing unit driven shaft 504 and the swing unit power shaft 505 are respectively fixed with a plurality of pulleys 15 of the same number, and the corresponding pulleys 15 on the swing unit driven shaft 504 and the swing unit power shaft 505 are connected by a belt 6; it also includes two first cylinders 3, each One end of each first cylinder 3 is hinged on the frame leg corresponding to the frame 2, and the telescopic end of each first cylinder 3 is hinged with a connecting plate 4, each connecting plate 4 is in a "Z" shape, and the connecting plate 4 is provided with a first rotating hole 401 and a second rotating hole 402. The first rotating holes 401 of the two connecting plates 4 are rotatably connected with a swing unit driven shaft 504. The two connecting plates 4 are respectively located at two ends of the swing unit driven shaft 504, and the second rotating holes 402 of the two connecting plates 4 are rotatably connected with the swing shaft 7. The swing unit driven shaft 504 and the swing shaft 7 are connected by a plurality of belt transmission units.

[0025] Example 3 like Figure 1-3As shown, the defective printed sheet rejection device of the offset printing machine proposed in this embodiment includes a frame 2, and the four frame legs of the frame are all connected to the ground feet 1 by threads. The frame 2 is connected with a swing unit, a power unit and a paper stop unit, and the power unit is arranged between the swing unit and the paper stop unit. It also includes a pressure plate unit, and the pressure plate unit is arranged on the frame 2 on one side of the paper stop unit. The swing unit includes a swing unit driven shaft 504 and a swing unit power shaft 505. The swing unit driven shaft 504 and the swing unit power shaft 505 are rotatably connected to the frame 2, and one end of the swing unit power shaft 505 extends out of the frame 2. The end of the swing unit power shaft 505 extending out of the frame 2 is connected to a reducer and a servo motor in sequence; the swing unit driven shaft 504 and the swing unit power shaft 505 are respectively fixed with a plurality of pulleys 15 of the same number, and the corresponding pulleys 15 on the swing unit driven shaft 504 and the swing unit power shaft 505 are connected by a belt 6; it also includes two first cylinders 3, each One end of each first cylinder 3 is hinged on the frame leg corresponding to the frame 2, and the telescopic end of each first cylinder 3 is hinged with a connecting plate 4, each connecting plate 4 is in a "Z" shape, and the connecting plate 4 is provided with a first rotating hole 401 and a second rotating hole 402. The first rotating holes 401 of the two connecting plates 4 are rotatably connected with a swing unit driven shaft 504. The two connecting plates 4 are respectively located at two ends of the swing unit driven shaft 504, and the second rotating holes 402 of the two connecting plates 4 are rotatably connected with the swing shaft 7. The swing unit driven shaft 504 and the swing shaft 7 are connected by a plurality of belt transmission units. The power unit includes a first rotating shaft 501, a power unit driven shaft 502 and a power unit power shaft 503. The first rotating shaft 501, the power unit driven shaft 502 and the power unit power shaft 503 are rotatably connected to the frame 2. One end of the power unit driven shaft 502 extends out of the frame 2. The end of the power unit driven shaft 502 extending out of the frame 2 is connected to a reducer and a servo motor in sequence; the power unit driven shaft 502 and the power unit power shaft 503 are connected by a plurality of groups of belt transmission units, and the power unit driven shaft 502 and the first rotating shaft 501 are connected by a plurality of groups of belt transmission units.

[0026] Example 4 like Figure 1-3As shown, the defective printed sheet rejection device of the offset printing machine proposed in this embodiment includes a frame 2, and the four frame legs of the frame are all connected to the ground feet 1 by threads. The frame 2 is connected with a swing unit, a power unit and a paper stop unit, and the power unit is arranged between the swing unit and the paper stop unit. It also includes a pressure plate unit, and the pressure plate unit is arranged on the frame 2 on one side of the paper stop unit. The swing unit includes a swing unit driven shaft 504 and a swing unit power shaft 505. The swing unit driven shaft 504 and the swing unit power shaft 505 are rotatably connected to the frame 2, and one end of the swing unit power shaft 505 extends out of the frame 2. The end of the swing unit power shaft 505 extending out of the frame 2 is connected to a reducer and a servo motor in sequence; the swing unit driven shaft 504 and the swing unit power shaft 505 are respectively fixed with a plurality of pulleys 15 of the same number, and the corresponding pulleys 15 on the swing unit driven shaft 504 and the swing unit power shaft 505 are connected by a belt 6; it also includes two first cylinders 3, each One end of each first cylinder 3 is hinged on the frame leg corresponding to the frame 2, and the telescopic end of each first cylinder 3 is hinged with a connecting plate 4, each connecting plate 4 is in a "Z" shape, and the connecting plate 4 is provided with a first rotating hole 401 and a second rotating hole 402. The first rotating holes 401 of the two connecting plates 4 are rotatably connected with a swing unit driven shaft 504. The two connecting plates 4 are respectively located at two ends of the swing unit driven shaft 504, and the second rotating holes 402 of the two connecting plates 4 are rotatably connected with the swing shaft 7. The swing unit driven shaft 504 and the swing shaft 7 are connected by a plurality of belt transmission units. The power unit includes a first rotating shaft 501, a power unit driven shaft 502 and a power unit power shaft 503. The first rotating shaft 501, the power unit driven shaft 502 and the power unit power shaft 503 are rotatably connected to the frame 2. One end of the power unit driven shaft 502 extends out of the frame 2. The end of the power unit driven shaft 502 extending out of the frame 2 is connected to a reducer and a servo motor in sequence; the power unit driven shaft 502 and the power unit power shaft 503 are connected by a plurality of groups of belt transmission units, and the power unit driven shaft 502 and the first rotating shaft 501 are connected by a plurality of groups of belt transmission units. The paper stop unit includes a paper stop unit screw shaft 16 and a paper stop unit supporting shaft 18, which are rotatably connected to the frame 2. One end of the paper stop unit screw shaft 16 extends out of the frame 2 and is fixedly connected to a handwheel 14. Half of the threads on the paper stop unit screw shaft 16 are left-handed, and the other half of the threads on the paper stop unit screw shaft 16 are right-handed. The paper stop unit screw shaft 16 is threadedly connected to a pair of symmetrical paper stoppers 17, which are composed of a translational baffle section and a horn guide section. The bottom surfaces of the two paper stoppers 17 are in contact with the paper stop unit supporting shaft 18, and the two paper stoppers 17 are arranged on both sides of the belt drive unit between the driven shaft 502 of the power unit and the first rotating shaft 501.The first rotating shaft 501 , the paper blocking unit supporting shaft 18 , the paper blocking unit lead screw shaft 16 , the power unit driven shaft 502 , the power unit power shaft 503 , the swing unit driven shaft 504 and the swing unit power shaft 505 are sequentially connected to the frame 2 .

[0027] Example 5 like Figure 1-3As shown, the defective printed sheet rejection device of the offset printing machine proposed in this embodiment includes a frame 2, and the four frame legs of the frame are all connected to the ground feet 1 by threads. The frame 2 is connected with a swing unit, a power unit and a paper stop unit, and the power unit is arranged between the swing unit and the paper stop unit. It also includes a pressure plate unit, and the pressure plate unit is arranged on the frame 2 on one side of the paper stop unit. The swing unit includes a swing unit driven shaft 504 and a swing unit power shaft 505. The swing unit driven shaft 504 and the swing unit power shaft 505 are rotatably connected to the frame 2, and one end of the swing unit power shaft 505 extends out of the frame 2. The end of the swing unit power shaft 505 extending out of the frame 2 is connected to a reducer and a servo motor in sequence; the swing unit driven shaft 504 and the swing unit power shaft 505 are respectively fixed with a plurality of pulleys 15 of the same number, and the corresponding pulleys 15 on the swing unit driven shaft 504 and the swing unit power shaft 505 are connected by a belt 6; it also includes two first cylinders 3, each One end of each first cylinder 3 is hinged on the frame leg corresponding to the frame 2, and the telescopic end of each first cylinder 3 is hinged with a connecting plate 4, each connecting plate 4 is in a "Z" shape, and the connecting plate 4 is provided with a first rotating hole 401 and a second rotating hole 402. The first rotating holes 401 of the two connecting plates 4 are rotatably connected with a swing unit driven shaft 504. The two connecting plates 4 are respectively located at two ends of the swing unit driven shaft 504, and the second rotating holes 402 of the two connecting plates 4 are rotatably connected with the swing shaft 7. The swing unit driven shaft 504 and the swing shaft 7 are connected by a plurality of belt transmission units. The power unit includes a first rotating shaft 501, a power unit driven shaft 502 and a power unit power shaft 503. The first rotating shaft 501, the power unit driven shaft 502 and the power unit power shaft 503 are rotatably connected to the frame 2. One end of the power unit driven shaft 502 extends out of the frame 2. The end of the power unit driven shaft 502 extending out of the frame 2 is connected to a reducer and a servo motor in sequence; the power unit driven shaft 502 and the power unit power shaft 503 are connected by a plurality of groups of belt transmission units, and the power unit driven shaft 502 and the first rotating shaft 501 are connected by a plurality of groups of belt transmission units. The paper stop unit includes a paper stop unit screw shaft 16 and a paper stop unit supporting shaft 18, which are rotatably connected to the frame 2. One end of the paper stop unit screw shaft 16 extends out of the frame 2 and is fixedly connected to a handwheel 14. Half of the threads on the paper stop unit screw shaft 16 are left-handed, and the other half of the threads on the paper stop unit screw shaft 16 are right-handed. The paper stop unit screw shaft 16 is threadedly connected to a pair of symmetrical paper stoppers 17, which are composed of a translational baffle section and a horn guide section. The bottom surfaces of the two paper stoppers 17 are in contact with the paper stop unit supporting shaft 18, and the two paper stoppers 17 are arranged on both sides of the belt drive unit between the driven shaft 502 of the power unit and the first rotating shaft 501.The first rotating shaft 501 , the paper blocking unit supporting shaft 18 , the paper blocking unit lead screw shaft 16 , the power unit driven shaft 502 , the power unit power shaft 503 , the swing unit driven shaft 504 and the swing unit power shaft 505 are sequentially connected to the frame 2 . The pressure plate unit includes a first right-angled plate 11 and a second right-angled plate 12, which are fixed to the side of the frame 2 by bolts, and the first right-angled plate 11 and the second right-angled plate 12 are arranged between the paper-blocking unit support shaft 18 and the paper-blocking unit screw shaft 16; it also includes a second cylinder 9, the second cylinder 9 is fixedly connected to the first right-angled plate 11, and it is aligned with the center line of the frame 2; it also includes a thin shaft 10, the thin shaft 10 is passed through the second right-angled plate 12, the thin shaft 10 and the telescopic rod of the second cylinder 9 are jointly fixed with the pressure plate 8, and the angle between the pressure plate 8 and the conveyor belt is an acute angle; it also includes a support plate 13, one end of the support plate 13 is fixedly connected to the frame 2, and the other end of the support plate 13 is rotatably connected to the driven shaft 502 of the power unit, and the support plate 13 is arranged directly below the pressure plate 8.

Claims

1. A defective printing rejection device for an offset printing machine, characterized in that: The invention comprises a frame (2), wherein four frame legs of the frame are all connected to feet (1) via threads, the frame (2) is connected to a swing unit, a power unit and a paper stop unit, the power unit is arranged between the swing unit and the paper stop unit, and further comprises a pressure plate unit, wherein the pressure plate unit is arranged on the frame (2) on one side of the paper stop unit.

2. The defective printing rejection device of the offset printing machine according to claim 1 is characterized in that: The swing unit comprises a swing unit driven shaft (504) and a swing unit power shaft (505), the swing unit driven shaft (504) and the swing unit power shaft (505) being rotatably connected to the frame (2), one end of the swing unit power shaft (505) extending out of the frame (2), and one end of the swing unit power shaft (505) extending out of the frame (2) being connected in sequence to a reducer and a servo motor; The swing unit driven shaft (504) and the swing unit power shaft (505) are respectively fixedly connected with a plurality of pulleys (15) of the same number, and the corresponding pulleys (15) on the swing unit driven shaft (504) and the swing unit power shaft (505) are connected via a belt (6); It also comprises two first cylinders (3), one end of each of the first cylinders (3) being hinged to a corresponding frame leg of the frame (2), the telescopic end of each of the first cylinders (3) being hinged to a connecting plate (4), each of the connecting plates (4) being in a "Z" shape, the connecting plates (4) being provided with a first rotating hole (401) and a second rotating hole (402), a swing unit driven shaft (504) being rotatably connected in the first rotating holes (401) of the two connecting plates (4), the two connecting plates (4) being respectively located at two ends of the swing unit driven shaft (504), the second rotating holes (402) of the two connecting plates (4) being jointly rotatably connected to a swing shaft (7), the swing unit driven shaft (504) and the swing shaft (7) being connected via a plurality of groups of belt transmission units.

3. The defective printed sheet rejection device of the offset printing press according to claim 2, characterized in that: The power unit comprises a first rotating shaft (501), a power unit driven shaft (502) and a power unit power shaft (503); the first rotating shaft (501), the power unit driven shaft (502) and the power unit power shaft (503) are rotatably connected to the frame (2); one end of the power unit driven shaft (502) extends out of the frame (2); and one end of the power unit driven shaft (502) extending out of the frame (2) is sequentially connected to a reducer and a servo motor; The power unit driven shaft (502) and the power unit power shaft (503) are connected via a plurality of groups of belt transmission units, and the power unit driven shaft (502) and the first rotating shaft (501) are connected via a plurality of groups of belt transmission units.

4. The defective printed sheet rejection device of the offset printing press according to claim 3 is characterized in that: The paper stop unit comprises a paper stop unit screw shaft (16) and a paper stop unit support shaft (18), the paper stop unit screw shaft (16) and the paper stop unit support shaft (18) are rotatably connected to the frame (2), one end of the paper stop unit screw shaft (16) extends out of the frame (2) and is fixedly connected to a hand wheel (14), half of the threads on the paper stop unit screw shaft (16) are left-handed, and the other half of the threads on the paper stop unit screw shaft (16) are right-handed; The paper baffle unit lead screw shaft (16) is threadedly connected to a pair of symmetrical paper baffles (17), wherein the paper baffles (17) are composed of a translation baffle section and a horn guide section, and the bottom surfaces of the two paper baffles (17) are in contact with the paper baffle unit support shaft (18), and the two paper baffles (17) are arranged on both sides of the belt transmission unit between the driven shaft (502) of the power unit and the first rotating shaft (501).

5. The defective printing rejection device of the offset printing machine according to claim 4, characterized in that: The first rotating shaft (501), the paper stop unit supporting shaft (18), the paper stop unit lead screw shaft (16), the power unit driven shaft (502), the power unit power shaft (503), the swing unit driven shaft (504) and the swing unit power shaft (505) are sequentially connected to the frame (2).

6. The defective printing rejection device of the offset printing machine according to claim 5, characterized in that: The pressure plate unit comprises a first right-angled vertical plate (11) and a second right-angled vertical plate (12), the first right-angled vertical plate (11) and the second right-angled vertical plate (12) being fixed to the side of the frame (2) by means of bolts, and the first right-angled vertical plate (11) and the second right-angled vertical plate (12) being arranged between the paper stop unit support shaft (18) and the paper stop unit lead screw shaft (16); It also includes a second cylinder (9), the second cylinder (9) being fixedly connected to the first right-angled vertical plate (11) and aligned with the center line of the frame (2); It also includes a thin shaft (10), the thin shaft (10) is inserted into the second right-angled vertical plate (12), the thin shaft (10) and the telescopic rod of the second cylinder (9) are fixedly connected to a pressing plate (8), and the angle between the pressing plate (8) and the conveyor belt is an acute angle; It also includes a support plate (13), one end of which is fixedly connected to the frame (2), and the other end of which is rotatably connected to the driven shaft (502) of the power unit, and the support plate (13) is arranged directly below the pressure plate (8).

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