A collecting device for an offset printing machine

Abstract

The utility model relates to offset printing equipment technical field, concretely is a kind of material receiving device of offset press, including machine body and speed reduction mechanism;First cross frame is provided on the base;Speed reduction mechanism includes the stand of being set on first cross frame, has respectively rotating setting on both sides stand and the suction speed reducer roll of drive shaft, first motor is set on one side stand, negative pressure generator is set on first cross frame, the hard tube of both ends respectively with the intercommunication of negative pressure generator, and the rotary connector of being set in hard tube one end and with intercommunication rotation connection;First motor and drive shaft drive connection, the roller surface of suction speed reducer roll is provided with rubber coating, and spiral negative pressure hole is provided on suction speed reducer roll;The utility model can play good speed reduction effect to paper in the process of material receiving, avoid the damage caused by impact and the problem that the avoidance distance is too long and cannot be stably stacked.

Description

Technical Field

[0001] This utility model relates to the field of offset printing equipment technology, and in particular to a material receiving device for an offset printing machine. Background Technology

[0002] Offset printing presses are core equipment that utilize the principle of ink-water balance and indirect printing methods for efficient and high-quality printing. They are widely used in the printing of books, newspapers, packaging, posters, and other products. The receiving device of an offset printing press, also known as the paper receiving device, is an important component of the offset printing press. It is responsible for receiving the printed sheets from the printing unit and stacking them neatly.

[0003] Chinese Patent No. CN212687130U discloses a paper receiving device for an offset printing machine, including a machine body. One side of the machine body is attached to the offset printing machine, and a paper receiving table is installed on the machine body. A lifting device is provided between the paper receiving table and the machine body. The lifting device drives the paper receiving table to slide along the height direction of the machine body. A forward baffle is installed on the side of the machine body away from the offset printing machine, and side baffles are installed on both sides of the machine body perpendicular to the installation of the forward baffle. The forward baffle is slidably disposed on the machine body in the direction of approaching or moving away from the offset printing machine. A driving assembly is provided between the forward baffle and the machine body, and the driving assembly drives the forward baffle to slide. This device has the effect of adjusting the paper by sliding the forward baffle after the paper stops moving due to loss of inertia, thereby reducing the probability of paper damage while ensuring the paper is neat.

[0004] However, the above technical solution has the following shortcomings: After the paper leaves the offset printing press and enters the delivery table under the action of inertia, the device uses the forward baffle to slide to give the paper enough distance so that the paper speed disappears and stops. However, the actual speed of the paper leaving the offset printing press is relatively large when the paper is actually delivered. Even if the forward baffle can avoid the buffer distance, the distance cannot exceed the length of the paper, otherwise it cannot be stacked. As a result, the impact of the paper contacting the forward baffle is still relatively large, which affects the integrity of the paper. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the background technology by proposing a paper receiving device for an offset printing machine. This device can effectively slow down the paper during the paper receiving process, avoiding damage caused by impact and preventing stable stacking due to excessive clearance distance.

[0006] The present invention provides a material receiving device for an offset printing machine, comprising a machine body and a speed-reducing mechanism; a first crossbeam is provided on the machine body; the speed-reducing mechanism includes a vertical frame provided on the first crossbeam, an air-suction reduction roller having a connecting shaft and a drive shaft respectively rotatably provided on the two vertical frames, a first motor provided on one vertical frame, a negative pressure generator provided on the first crossbeam, a rigid tube with both ends respectively connected to the connecting shaft and the negative pressure generator, and a rotating connector provided at one end of the rigid tube and rotatably connected to the connecting shaft; the first motor and the drive shaft are drivenly connected, the roller surface of the air-suction reduction roller is provided with a rubber coating, and the air-suction reduction roller is provided with spiral negative pressure holes.

[0007] Preferably, a convex ring is coaxially provided on the connecting shaft, the convex ring is rotatably disposed inside the rotating connector, and a sealing ring is provided inside the rotating connector.

[0008] Preferably, a guide conveyor is provided on the first crossbeam, and two vertically distributed limiting plates are provided on the guide conveyor.

[0009] Preferably, the machine body is provided with three second crossbeams and a vertically sliding paper receiving table, and the second crossbeams are provided with an alignment mechanism.

[0010] Preferably, the leveling mechanism includes a fixed seat on the second crossbeam, a second motor on the second fixed seat, a turntable driven and connected to the second motor, an eccentric rod on the turntable, a first connecting rod movably connected to the eccentric rod, a second connecting rod movably connected to the first connecting rod, a slider on the second connecting rod, a guide block on the fixed seat, and a push plate on the fixed seat; the slider and the guide block are horizontally slidably connected.

[0011] Preferably, the machine body is provided with a top frame, and an ultrasonic sensor is provided on the top frame.

[0012] Preferably, a drive device is provided on the machine body.

[0013] Compared with the prior art, the present invention has the following beneficial technical effects: 1. This utility model can greatly reduce the moving speed of paper when it is conveyed to the paper receiving table by setting a speed reduction mechanism. It can not only avoid the problem of impact damage caused by excessive paper speed during traditional material receiving, but also avoid the problem of paper not being able to be stacked normally and stably due to excessive avoidance distance. In addition, the setting of spiral negative pressure hole and rubber coating can prevent paper from tangling. It has good practicality. 2. This utility model avoids the problem of accelerated equipment wear caused by the need to constantly adjust the driving direction of the motor or cylinder in the traditional method of driving the push plate through the flushing mechanism. In addition, the size of the connecting rod can be designed according to the size of the paper to ensure the adaptability of the device and reduce costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the speed reduction mechanism of this utility model; Figure 3 This is a schematic diagram of the structure of the suction speed reduction roller of this utility model; Figure 4 This is a schematic diagram of the alignment mechanism of this utility model; Reference numerals in the attached drawings: 1. Machine body; 2. First crossbeam; 3. Vertical frame; 4. Suction reduction roller; 5. Connecting shaft; 6. Drive shaft; 7. First motor; 8. Negative pressure generator; 9. Rigid tube; 10. Rotary connector; 11. Convex ring; 12. Sealing ring; 13. Spiral negative pressure hole; 14. Guide conveyor table; 15. Limiting plate; 16. Paper receiving table; 17. Second crossbeam; 18. Fixed base; 19. Second motor; 20. Turntable; 21. Eccentric rod; 22. First connecting rod; 23. Second connecting rod; 24. Slider; 25. Guide block; 26. Push plate; 27. Top frame; 28. Ultrasonic sensor; 29. ​​Drive device. Detailed Implementation

[0015] Example 1, as Figure 1 - Figure 4 As shown in the figure, the material receiving device of the offset printing machine proposed in this embodiment includes a machine body 1 and a speed reduction mechanism; a first crossbeam 2 is provided on the machine body 1, and the machine body 1 is located at the tail end of the offset printing machine conveyor line for continuous material receiving.

[0016] The speed reduction mechanism includes a vertical frame 3 mounted on the first horizontal frame 2, an air intake reduction roller 4 having a connecting shaft 5 and a drive shaft 6 respectively rotatably mounted on the two vertical frames 3, a first motor 7 mounted on one vertical frame 3, a negative pressure generator 8 mounted on the first horizontal frame 2, a rigid tube 9 with both ends connected to the connecting shaft 5 and the negative pressure generator 8 respectively, and a rotating connector 10 mounted on one end of the rigid tube 9 and rotatably connected to the connecting shaft 5; the first motor 7 and the drive shaft 6 are driven together, the roller surface of the air intake reduction roller 4 is provided with a rubber coating, the air intake reduction roller 4 is provided with a spiral negative pressure hole 13, a convex ring 11 is coaxially mounted on the connecting shaft 5, the convex ring 11 is rotatably mounted inside the rotating connector 10, and a sealing ring 12 is provided inside the rotating connector 10. The rotating connector 10, the convex ring 11, and the sealing ring 12 are provided so that the rotation of the air intake reduction roller 4 and the sealing performance are not affected when the rigid tube 9 is subjected to air intake negative pressure.

[0017] The first crossbeam 2 is equipped with a guide conveyor 14, and the guide conveyor 14 is equipped with two vertically distributed limit plates 15. The machine body 1 is equipped with three second crossbeams 17 and a vertically sliding paper receiving table 16.

[0018] In this embodiment, before the paper after offset printing needs to be transported to the receiving table 16 for stacking and collection, the paper passes through the suction deceleration roller 4 and the guide conveyor table 14. The first motor 7 drives the suction deceleration roller 4 to rotate through the drive shaft 6. At the same time, the negative pressure generator 8 applies negative pressure to the inside of the suction deceleration roller 4 through the rigid tube 9 and the connecting shaft 5, thereby causing the spiral negative pressure holes 13 of the suction deceleration roller 4 to generate a certain suction force. When the paper passes through the suction deceleration roller 4, the roller surface contacts the paper, thereby reducing the paper speed through friction. This greatly reduces the speed at which the paper falls onto the receiving table 16, avoiding damage caused by needing to stop the movement by impacting the paper-blocking structure. Furthermore, the spiral negative pressure holes 13 are arranged in a spiral, causing the paper adsorption points to change dynamically with rotation, preventing the formation of a fixed entanglement path. At the same time, the rubber coating has the characteristics of high friction coefficient and low adhesion, avoiding the formation of a force around the suction deceleration roller 4 due to continuous adsorption of the paper, thus avoiding the drawback of entanglement and having good practicality.

[0019] Example 2, as Figure 1 and Figure 4 As shown, the material receiving device for an offset printing machine proposed in this embodiment differs from that in Embodiment 1. In this embodiment, a leveling mechanism is provided on the second crossbeam 17. The leveling mechanism includes a fixed base 18 on the second crossbeam 17, a second motor 19 on the second fixed base 18, a turntable 20 driven and connected to the second motor 19, an eccentric rod 21 on the turntable 20, a first connecting rod 22 movably connected to the eccentric rod 21, a second connecting rod 23 movably connected to the first connecting rod 22, a slider 24 on the second connecting rod 23, a guide block 25 on the fixed base 18, and a push plate 26 on the fixed base 18. The slider 24 and the guide block 25 are horizontally slidably connected.

[0020] In this embodiment, after the paper falls onto the receiving table 16, the second motor 19 is started to drive the turntable 20 to rotate. The turntable 20 drives the eccentric rod 21 to rotate, and the eccentric rod 21 drives one end of the first connecting rod 22 to rotate around the center of the turntable 20. At the same time, under the guidance of the slider 24 and the guide block 25, the other end of the first connecting rod 22 pulls one end of the second connecting rod 23 to perform horizontal reciprocating motion. Then, the second connecting rod 23 drives the push plate 26 to perform horizontal reciprocating motion. The three push plates 26 are located on the three sides of the paper. When the restricted space formed by the three push plates 26 is in accordance with the size of the paper, the sides of the paper delivered to the receiving table 16 become neat. This avoids the problem of accelerated wear of the equipment caused by the need to constantly adjust the driving direction of the motor or cylinder in the traditional way of driving the push plate 26. Moreover, the size of the connecting rod can be designed according to the size of the paper to ensure adaptability and reduce the cost of the drive structure from high functional requirements.

[0021] Example 3, as Figure 1As shown, the material receiving device for an offset printing machine proposed in this embodiment, compared with the first embodiment, has a top frame 27 on the machine body 1, an ultrasonic sensor 28 on the top frame 27, and a drive device 29 on the machine body 1. The drive device 29 adopts a motor-driven lead screw transmission method and is equipped with a guide structure and an encoder (not shown).

[0022] In this embodiment, as the paper is continuously collected, the stack height will increase. The ultrasonic sensor 28 can detect the height of the top of the paper stack and provide real-time feedback to the control system. The encoder can monitor the motor speed, calculate the position of the paper receiving platform 16, and then drive the lead screw to rotate and the screw drive to raise and lower the paper receiving platform 16. When the height of the paper stack approaches the set value, the motor drives the paper receiving platform 16 to descend, maintaining a constant drop, thereby achieving stable paper collection.

[0023] It should be noted that the descent speed of the paper receiving table 16 needs to be matched with the printing speed to avoid paper piling up too quickly and causing chaos. This technology and the structure of the drive device 29 are both existing mature technologies, and this part is not an innovative part of this application. The technical effect of this application is achieved entirely through the aforementioned mechanical structure improvement.

[0024] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A receiving device for an offset printing machine, characterized in that, include: The body (1) is equipped with a first crossbar (2); The speed reduction mechanism includes a frame (3) mounted on the first crossbeam (2), an air intake deceleration roller (4) having a connecting shaft (5) and a drive shaft (6) respectively mounted on the two side frames (3), a first motor (7) mounted on one side frame (3), a negative pressure generator (8) mounted on the first crossbeam (2), a rigid tube (9) with both ends connected to the connecting shaft (5) and the negative pressure generator (8) respectively, and a rotating connector (10) mounted on one end of the rigid tube (9) and rotatably connected to the connecting shaft (5); the first motor (7) and the drive shaft (6) are driven together, the roller surface of the air intake deceleration roller (4) is provided with a rubber coating, and the air intake deceleration roller (4) is provided with a spiral negative pressure hole (13).

2. The material receiving device for an offset printing machine according to claim 1, characterized in that, A convex ring (11) is coaxially provided on the connecting shaft (5). The convex ring (11) is rotatably disposed inside the rotating connector (10). A sealing ring (12) is provided inside the rotating connector (10).

3. The material receiving device for an offset printing machine according to claim 1, characterized in that, The first crossbeam (2) is provided with a guide conveyor (14), and the guide conveyor (14) is provided with two vertically distributed limiting plates (15).

4. The material receiving device for an offset printing machine according to claim 1, characterized in that, The machine body (1) is provided with three second crossbars (17) and a vertically sliding paper receiving table (16), and the second crossbars (17) are provided with a leveling mechanism.

5. The material receiving device for an offset printing machine according to claim 4, characterized in that, The leveling mechanism includes a fixed seat (18) on the second crossbeam (17), a second motor (19) on the second fixed seat (18), a turntable (20) driven and connected to the second motor (19), an eccentric rod (21) on the turntable (20), a first connecting rod (22) movably connected to the eccentric rod (21), a second connecting rod (23) movably connected to the first connecting rod (22), a slider (24) on the second connecting rod (23), a guide block (25) on the fixed seat (18), and a push plate (26) on the fixed seat (18); the slider (24) and the guide block (25) are horizontally slidably connected.

6. The material receiving device for an offset printing machine according to claim 4, characterized in that, The body (1) is equipped with a top frame (27), and an ultrasonic sensor (28) is installed on the top frame (27).

7. The material receiving device for an offset printing machine according to claim 4, characterized in that, A drive device (29) is installed on the body (1).

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