CN214267001U

CN214267001U - High adaptability offset press

Info

Publication number: CN214267001U
Application number: CN202023278192.2U
Authority: CN
Inventors: 陈正芳
Original assignee: Zhangjiagang Jinggong Packing & Color Printing Co ltd
Current assignee: Zhangjiagang Jinggong Packing & Color Printing Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-09-24
Anticipated expiration: 2030-12-30

Abstract

The application relates to a high-adaptability offset press, which comprises a case, wherein a rubber roller and a pressure roller which is abutted against the rubber roller are arranged in the case, and the pressure roller comprises a mandrel and a barrel body which is coaxially arranged on the mandrel; arc-shaped guide grooves are formed in two opposite side plates of the case, the circle centers of the arc-shaped guide grooves fall on the axis of the blanket cylinder, and the end parts of the mandrels penetrate through the arc-shaped guide grooves and penetrate out of the side plates of the case; the outer wall of the case is rotatably connected with a swinging arm capable of swinging around the axis of the blanket cylinder, and one end of the mandrel extending out of the case is rotatably connected with the swinging arm; the core shaft is connected with a power mechanism for driving the core shaft to rotate, and the swing arm is connected with a driving mechanism for driving the swing arm to swing. The application discloses offset press's pressure cylinder position is adjustable, can adapt to the poor paper printing demand of bold face pattern or permeability, and adaptability is good.

Description

High adaptability offset press

Technical Field

The application relates to the field of printing equipment, in particular to a high-adaptability offset press.

Background

In the related art, an offset printing press includes an ink cylinder, a plate cylinder abutting on the ink cylinder, a blanket cylinder abutting on the plate cylinder, and a pressure cylinder abutting on the blanket cylinder. During offset printing, the paper passes between the blanket cylinder and the pressure cylinder. The inking cylinder transfers the ink to the plate cylinder to form patterns or characters on the plate cylinder; the plate cylinder transfers the ink to a rubber cylinder, and the rubber cylinder and the pressure cylinder are squeezed to transfer the ink to paper to be printed with patterns and characters.

In the related art offset printing machine, the blanket cylinder and the pressure cylinder are in line contact with each other, and the paper is nipped between the blanket cylinder and the pressure cylinder for a very short time to complete the ink transfer. However, in actual production, the ink permeability, thickness and printed pattern area of offset paper are different, when a large-area pattern is printed on the surface of thick paper or a pattern is printed on paper with poor permeability, the phenomenon of uneven color of the printed pattern is easy to occur because the retention time of the paper between the blanket cylinder and the pressure cylinder is short, and the offset printing machine in the related art has the defect that the offset printing machine cannot well adapt to the printing requirements of various types of paper.

SUMMERY OF THE UTILITY MODEL

In order to increase the adaptability of the offset printing machine, the application provides a high-adaptability offset printing machine.

The application provides a high adaptability offset press adopts following technical scheme:

a high-adaptability offset press comprises a case, wherein a rubber roller and a pressure roller abutted against the rubber roller are arranged in the case, and the pressure roller comprises a mandrel and a barrel body coaxially arranged on the mandrel; arc-shaped guide grooves are formed in two opposite side plates of the case, the circle centers of the arc-shaped guide grooves fall on the axis of the blanket cylinder, and the end parts of the mandrels penetrate through the arc-shaped guide grooves and penetrate out of the side plates of the case; the outer wall of the case is rotatably connected with a swinging arm capable of swinging by taking the axis of the blanket cylinder as a rotating shaft, and one end of the mandrel extending out of the case is rotatably connected with the swinging arm; the core shaft is connected with a power mechanism for driving the core shaft to rotate, and the swing arm is connected with a driving mechanism for driving the swing arm to swing.

By adopting the technical scheme, when a large-block-surface pattern needs to be printed or a pattern needs to be printed on paper with deviation of ink permeability, the swinging arm is driven to swing by the driving mechanism so as to change the relative positions of the pressure roller and the blanket cylinder, so that the horizontal distance between the axis of the pressure roller and the axis of the blanket cylinder is increased, the wrapping angles on the blanket cylinder and the pressure roller are increased when the paper runs, and the large-block-surface color pattern is favorably printed and a clear pattern is obtained by printing on the paper with deviation of permeability. When fine line patterns need to be printed or the paper has good ink permeability, the swinging arm is driven to swing reversely by the driving mechanism, and the horizontal distance between the axis of the pressure roller and the axis of the blanket roller is reduced.

Compared with the offset press with the relative constant positions of the blanket cylinder and the pressure cylinder in the related art, the offset press has the advantages that the position of the pressure cylinder is adjustable, and the adaptability is better.

Optionally, the driving mechanism comprises a cross rod and a cross plate, the cross rod and the cross plate are both arranged in the chassis along a direction parallel to the axis of the pressure roller, and the side wall of the chassis is provided with a guide groove for the end of the cross rod to penetrate out; each swing arm is rotatably connected with a connecting rod, and one end of each connecting rod, which is far away from each swing arm, is rotatably connected with the cross rod; and the transverse plate is provided with a driving part for generating push-pull power to drive the transverse rod to be far away from or close to the pressure roller.

Through adopting above-mentioned technical scheme, the drive division produces push-and-pull power and orders about the horizontal pole along guide way length direction translation, and the connecting rod at horizontal pole both ends is synchronous to exert push-and-pull power to pressure roller both ends to realize the regulation of pressure roller position, stability is good.

Optionally, the driving portion includes a threaded sleeve fixed to the cross rod and an adjusting screw inserted into the cross plate, the adjusting screw penetrates through the cross plate and is inserted into the sleeve, and the adjusting screw is in threaded connection with the threaded sleeve.

Through adopting above-mentioned technical scheme, rotatory adjusting screw changes adjusting screw and inserts the telescopic degree of depth of screw thread and can adjust the interval between horizontal pole and the diaphragm to make the connecting rod promote the swing arm swing, realize pressure cylinder position control.

Optionally, a hand wheel is arranged at one end, away from the threaded sleeve, of the adjusting screw.

Through adopting above-mentioned technical scheme, increased the convenience of rotatory adjusting screw operation.

Optionally, the power mechanism includes a motor, a transmission belt, and a belt tightening portion for keeping the transmission belt in a tightened state, and the transmission belt is sleeved on the mandrel and the motor driving end together.

Through adopting above-mentioned technical scheme, the motor circular telegram work can order about pressure cylinder through the drive belt transmission and rotate, and this kind of transmission mode adapts to pressure cylinder position change easily.

Optionally, the belt tightening part comprises a movable block and a fixed block fixed on the side wall of the case, a tightening wheel is arranged on the fixed block through a roller mounting seat, and the transmission belt is arranged around the tightening wheel; the movable block is provided with a guide rod, and the fixed block is provided with a guide hole for inserting the guide rod; a compression spring is sleeved on the guide rod; one end of the compression spring is fixed on the movable block, and the other end of the compression spring is fixed on the fixed block.

Through adopting above-mentioned technical scheme, when pressure roll position changed, driving belt can be not hard up at small amplitude within range, because compression spring's existence can make the movable block have the trend of being close to the fixed block for the driving belt can be tightened to the tight wheel, guarantees pressure roller axle normal rotation.

Optionally, the tightening wheel is a sheave.

Through adopting above-mentioned technical scheme, the driving belt is difficult for breaking away from the tight pulley.

Optionally, the guide bar is provided with at least two.

Through adopting above-mentioned technical scheme, restricted the moving direction of movable block for the movable block is difficult for deflecting and causes driving belt to break away from the tight pulley.

In summary, the present application includes at least one of the following beneficial technical effects:

1. according to the paper wrapping machine, the arc-shaped guide groove is formed in the side plate of the machine box, the pressure roller is arranged through the swing arm at the end part, under the driving of the driving mechanism, the swing arm swings to change the relative position of the pressure roller and the rubber roller, the wrapping angle of paper on the pressure roller and the rubber roller can be adjusted, different processing requirements can be met, and the adaptability is good;

2. the driving mechanism comprises a cross rod, a transverse plate and a driving part, a connecting rod is connected between the cross rod and the swing arm, acting force can be synchronously applied to the two ends of the pressure roller, and the pressure roller can stably move.

Drawings

Fig. 1 is a schematic structural diagram of a high-adaptability offset printing machine in the embodiment of the present application.

Fig. 2 is a schematic structural diagram of a high-adaptability offset printing machine in the embodiment of the present application.

Fig. 3 is an enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic structural view of a belt tightening part in the embodiment of the present application.

Description of reference numerals: 1. a chassis; 11. a water tank; 12. washing the roller with water; 13. an ink feeding roller; 14. a plate cylinder; 15. an arc-shaped guide groove; 16. a guide groove; 2. a blanket cylinder; 3. a pressure roller; 31. a mandrel; 32. a barrel; 4. a swing arm; 5. a cross bar; 51. a connecting rod; 52. a threaded sleeve; 6. a transverse plate; 61. adjusting the screw rod; 62. a hand wheel; 7. a motor; 71. a drive belt; 8. a movable block; 81. a tension wheel; 82. a roller mounting seat; 83. a guide bar; 831. a compression spring; 9. a fixed block; 91. and (4) a guide hole.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses a high-adaptability offset press.

Referring to fig. 1 and 2, the high-adaptability offset printing press includes a cabinet 1. A plate cylinder 14, a blanket cylinder 2 abutting against the plate cylinder 14, and a impression cylinder 3 abutting against the blanket cylinder 2 are provided in this order from top to bottom in the housing 1.

Referring to fig. 1 and 2, the cabinet 1 is further provided with an ink feed roller 13 abutting against the plate cylinder 14, and printing ink is transferred to the surface of the plate cylinder 14 by the ink feed roller 13. A water tank 11 is arranged on one side of the plate cylinder 14, and a washing roller 12 is arranged above the water tank 11. The water wash roller 12 abuts against the plate cylinder 14, and the roller body portion is located in the water tank 11. The undertransferred ink on the surface of the plate cylinder 14 can be cleaned by the water wash roller 12.

Referring to fig. 1 and 2, a plate cylinder 14 abuts the blanket cylinder 2, and the plate cylinder 14 transfers ink to the blanket cylinder 2 during rolling, forming a pattern or letter on the blanket cylinder 2.

Referring to fig. 1 and 2, the pressure roller 3 includes a mandrel 31 and a cylinder 32 coaxially disposed on the mandrel 31, the cylinder 32 abuts against the blanket cylinder 2, and a power mechanism is connected to an end of the mandrel 31.

Referring to fig. 1 and 2, the power mechanism includes a motor 7 and a transmission belt 71, and the transmission belt 71 is sleeved on the end of the mandrel 31 and the driving end of the motor 7 together. The motor 7 is electrified to work, and the spindle 31 is driven to rotate through the transmission belt 71.

Referring to fig. 1 and 2, in the present embodiment, in order to increase the adaptability of the offset printing press, the pressure cylinder 3 is movably disposed so that the relative position thereof to the blanket cylinder 2 can be adjusted. Arc-shaped guide grooves 15 are formed in the side plates on the two opposite sides of the machine box 1, and the circle centers of the arc-shaped guide grooves 15 fall on the axis of the blanket cylinder 2. The ends of the mandrel 31 protrude through the arcuate guide slots 15. The outer wall of a side plate of the case 1 is rotatably provided with a swing arm 4, the swing axis of the swing arm 4 is superposed with the axis of the blanket cylinder 2, and one end of the mandrel 31 extending out of the case 1 is rotatably connected with the swing arm 4.

Referring to fig. 2 and 3, the swing arm 4 is connected with a drive mechanism. The driving mechanism comprises a cross bar 5 and a cross plate 6 which are arranged in a direction parallel to the axis of the pressure roller 3. The transverse plate 6 is fixed on the feeding side of the case 1, and two ends of the transverse plate are respectively fixed on two side plates of the case 1. The cross bar 5 is located between the pressure roller 3 and the cross plate 6. The opposite two side walls of the case 1 are provided with guide grooves 16 for the end parts of the cross rods 5 to penetrate through, and the guide grooves 16 are arranged along the horizontal direction. The end of the cross bar 5 penetrates out of the guide groove 16 and is rotatably connected with a connecting rod 51, and one end of the connecting rod 51 far away from the cross bar 5 is hinged with the swing arm 4. The cross bar 5 is fixed with a threaded sleeve 52, the threaded sleeve 52 is arranged along the direction perpendicular to the cross bar 5, and the threaded sleeve 52 is fixed in the middle of the cross bar 5. An adjusting screw 61 penetrates through the transverse plate 6, one end of the adjusting screw 61 is inserted into the threaded sleeve 52, and a hand wheel 62 is fixed at the other end of the adjusting screw. By rotating the hand wheel 62, the depth of the adjusting screw 61 inserted into the threaded sleeve 52 is changed, and the distance between the cross rod 5 and the cross plate 6 is changed, so that the cross rod 5 slides along the guide groove 16. When the crossbar 5 moves, the swing arm 4 is swung by the link 51. At this time, the mandrel 31 slides in the arc-shaped guide groove 15, and the horizontal distance between the axis of the pressure cylinder 3 and the axis of the blanket cylinder 2 is changed.

Referring to fig. 2 and 4, in order to keep the driving belt 71 in a tightened state when the position of the pressure roller 3 is changed, a belt tightening portion for tightening the driving belt 71 is further provided on the side wall of the cabinet 1. The belt tightening part comprises a movable block 8 and a fixed block 9, and the fixed block 9 is fixed on the case 1. Two guide holes 91 are formed in the fixing block 9, and the guide holes 91 are arranged along the horizontal direction. Two guide rods 83 are fixed on the side face of the movable block 8, the two guide rods 83 correspond to the two guide holes 91 one by one, and one end, far away from the movable block 8, of each guide rod 83 is inserted into each guide hole 91. A compression spring 831 is sleeved on the guide rod 83, one end of the compression spring 831 is fixed on the movable block 8, and the other end of the compression spring 831 is fixed on the fixed block 9. One side of the movable block 8, which deviates from the fixed block 9, is provided with a roller mounting seat 82, and the roller mounting seat 82 is provided with a tightening wheel 81. In this embodiment, the tightening wheel 81 is a sheave, and the transmission belt 71 is disposed around the tightening wheel 81. The compression spring 831 is always in a stretched state, so that the transmission belt 71 is always kept in a tightened state, and the spindle 31 can be stably driven to rotate.

The implementation principle of the high-adaptability offset printing machine in the embodiment of the application is as follows:

for general pattern printing or pattern/text printing on regular permeable paper, the pressure cylinder 3 is located below the blanket cylinder 2 with a horizontal spacing equal to zero between the axes. In this state, when the paper passes between the pressure roller 3 and the blanket roller 2, the paper is in line contact with both the pressure roller and the blanket roller, and the pressing time is short, so that patterns such as small pieces and fine lines can be clearly printed.

When a large-block pattern needs to be printed or a piece of paper with poor ink permeability needs to be printed, the hand wheel 62 is rotated to enable the length of the adjusting screw 61 inserted into the threaded sleeve 52 to be shortened, the cross rod 5 is driven to move, the swing arm 4 is driven to swing through the connecting rod 51, the pressure roller 3 is driven to rotate around the axis of the blanket cylinder 2, and the distance between the axis of the pressure roller 3 and the axis of the blanket cylinder 2 is larger than zero. At this time, when the sheet passes between the pressure cylinder 3 and the blanket cylinder 2, the wrap angle increases in both the pressure cylinder 3 and the blanket cylinder 2, and ink diffusion and penetration are accelerated, so that it is easier to print a large surface pattern having a uniform color. Compared with the offset printing machine with the fixed positions of the pressure roller 3 and the blanket cylinder 2, the offset printing machine has better adaptability and can adapt to different printing requirements.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a high adaptability offset press, includes quick-witted case (1), be equipped with blanket cylinder (2) and with pressure cylinder (3) of blanket cylinder (2) butt in quick-witted case (1), its characterized in that: the pressure roller (3) comprises a mandrel (31) and a cylinder body (32) coaxially arranged on the mandrel (31); arc-shaped guide grooves (15) are formed in two opposite side plates of the case (1), the circle centers of the arc-shaped guide grooves (15) are located on the axis of the blanket cylinder (2), and the end part of the mandrel (31) penetrates through the arc-shaped guide grooves (15) and penetrates out of the side plates of the case (1); a swinging arm (4) capable of swinging by taking the axis of the blanket cylinder (2) as a rotating shaft is rotatably connected to the outer wall of the case (1), and one end of the mandrel (31) extending out of the case (1) is rotatably connected with the swinging arm (4); the core shaft (31) is connected with a power mechanism for driving the core shaft (31) to rotate, and the swing arm (4) is connected with a driving mechanism for driving the swing arm (4) to swing.

2. The high-adaptability offset printing machine according to claim 1, characterized in that: the driving mechanism comprises a cross rod (5) and a transverse plate (6), the cross rod (5) and the transverse plate (6) are both arranged on the case (1) along the direction parallel to the axis of the pressure roller (3), and a guide groove (16) for the end part of the cross rod (5) to penetrate out is formed in the side wall of the case (1); each swing arm (4) is rotatably connected with a connecting rod (51), and one end, far away from the swing arm (4), of each connecting rod (51) is rotatably connected with the cross rod (5); and the transverse plate (6) is provided with a driving part for generating push-pull power to drive the transverse rod (5) to be far away from or close to the pressure roller (3).

3. The high-adaptability offset printing machine according to claim 2, characterized in that: the driving part comprises a threaded sleeve (52) fixed on the cross rod (5) and an adjusting screw rod (61) inserted into the transverse plate (6), the adjusting screw rod (61) penetrates through the transverse plate (6) and is inserted into the sleeve, and the adjusting screw rod (61) is in threaded connection with the threaded sleeve (52).

4. A high-adaptability offset printing press as set forth in claim 3, wherein: and a hand wheel (62) is arranged at one end of the adjusting screw rod (61) far away from the threaded sleeve (52).

5. The high-adaptability offset printing machine according to claim 1, characterized in that: the power mechanism comprises a motor (7), a transmission belt (71) and a belt tightening part used for keeping the transmission belt (71) in a tightening state, and the transmission belt (71) is sleeved on the mandrel (31) and the driving end of the motor (7) together.

6. The high-adaptability offset printing machine according to claim 5, wherein: the belt tightening part comprises a movable block (8) and a fixed block (9) fixed on the side wall of the case (1), a tightening wheel (81) is arranged on the fixed block (9) through a roller mounting seat (82), and the transmission belt (71) is arranged by bypassing the tightening wheel (81); the movable block (8) is provided with a guide rod (83), and the fixed block (9) is provided with a guide hole (91) for the guide rod (83) to insert; a compression spring (831) is sleeved on the guide rod (83); one end of the compression spring (831) is fixed on the movable block (8), and the other end of the compression spring is fixed on the fixed block (9).

7. The high-adaptability offset printing machine according to claim 6, wherein: the tightening wheel (81) is a grooved wheel.

8. The high-adaptability offset printing machine according to claim 6, wherein: the number of the guide rods (83) is at least two.