Water transfer mechanism for an offset printing press

Abstract

The application discloses a water transmission mechanism of a printing machine, which comprises a water outlet roller, a metering roller, a water receiving roller and a water stringing roller. The water outlet roller is rotatably arranged on a first swing arm, a water tank is installed on the first swing arm, and the first swing arm is swingably arranged on a rack. The metering roller is rotatably arranged on a second swing arm, and the second swing arm is swingably arranged on the first swing arm. The water receiving roller is rotatably arranged on a third swing arm, the third swing arm is connected with a third driving member for driving the third swing arm to swing, and the third driving member is installed on the second swing arm. The water stringing roller is rotatably arranged on the rack, the third swing arm and the water stringing roller are coaxially arranged, and the third swing arm and the water stringing roller are oppositely rotatably arranged. The water outlet roller, the metering roller, the water receiving roller and the plate cylinder can be pressed together or separated, and can be selected according to different states. When the equipment is stopped, the rollers are in a separated state, the rollers are not pressed, are not easy to be deformed, and have a longer service life.

Description

TECHNICAL FIELD

[0001] The present application relates to an improved water transfer mechanism of a flexographic printing machine. BACKGROUND

[0002] The flexographic printing machine has an ink path and a water path, and the water path usually has a water roller, a string water roller, a metering roller and a water outlet roller; when starting, the water roller is attached to the plate cylinder, and the water outlet roller transfers dampening liquid to the plate cylinder through the metering roller and the water roller in turn, and the string water roller rotates relative to the water roller and moves axially to make the dampening liquid on the water roller evenly distributed; when stopping, the water roller is detached from the plate roller.

[0003] The main problems of the current water path are: 1. The fixed pressing state of the water roller, the metering roller and the water outlet roller when stopping will cause the deformation of the rollers, affecting the service life of the rollers; 2. The rollers are worn and deformed during use, and the pressure and gap between the rollers change, and too much water on the plate cylinder will cause printing problems. SUMMARY

[0004] In view of the technical problems in the background art, the technical problem solved by the present application aims to provide a water transfer mechanism of a flexographic printing machine capable of adjusting the position of the rollers and the pressure between the rollers.

[0005] To solve the above technical problems, the present application adopts the following technical scheme: the water transfer mechanism of the flexographic printing machine, characterized by comprising a water outlet roller, a metering roller, a water roller and a string water roller;

[0006] The water outlet roller is rotatably arranged on a first swing arm, and a water tank is installed on the first swing arm, and the first swing arm is swingably arranged on a machine frame;

[0007] The metering roller is rotatably arranged on a second swing arm, and the second swing arm is swingably arranged on the first swing arm;

[0008] The water roller is rotatably arranged on a third swing arm, and the third swing arm is connected with a third driving member for driving the swing of the third swing arm, and the third driving member is installed on the second swing arm;

[0009] The string water roller is rotatably arranged on the machine frame, the third swing arm and the string water roller are coaxially arranged, and the third swing arm and the string water roller are relatively rotatably arranged.

[0010] The water outlet roller, the metering roller, the water receiving roller and the cylinder of the application can be pressed together or separated, and are selected according to different states; in the printing state, the water outlet roller is attached to the metering roller, the metering roller is attached to the water receiving roller, and the water receiving roller is also attached to the water string roller and the cylinder; when the printing is paused, the first swing arm swings, and the water outlet roller, the metering roller, the water string roller and the water receiving roller move together, and the water receiving roller is separated from the cylinder; when the equipment is stopped, the first swing arm swings, the water receiving roller is separated from the cylinder, the second swing arm swings, the metering roller is separated from the water outlet roller, the third swing arm swings, the water receiving roller is separated from the metering roller, the rollers are in a separated state, the rollers are not pressed and are not easy to deform, and the service life is longer.

[0011] Preferably, the first swing arm is connected with a first driving member for driving the first swing arm to swing on the frame, and the first driving member is installed on the frame;

[0012] The second swing arm is connected with a second driving member for driving the second swing arm to swing on the first swing arm, and the second driving member is installed on the first swing arm;

[0013] The third swing arm is connected with a third driving member for driving the third swing arm to swing, and the third driving member is installed on the second swing arm.

[0014] The first driving member, the second driving member and the third driving member respectively drive the first swing arm, the second swing arm and the third swing arm to swing, so that the rollers are attached or separated.

[0015] Preferably, the first swing arm is provided with a first connecting rod and a second connecting rod which rotate on the first swing arm;

[0016] One end of the first connecting rod is coaxially arranged with the water outlet roller, and the other end of the first connecting rod is rotatably arranged on the frame;

[0017] One end of the second connecting rod is rotatably connected with the first swing arm, and the other end of the second connecting rod is rotatably arranged on the frame;

[0018] The connecting points of the first connecting rod, the second connecting rod, the first swing arm and the frame form an equal-arm double-rocker mechanism, and one end of the first connecting rod or the second connecting rod is connected with the first driving member. The first driving member drives the first swing arm to swing on the frame, and the equal-arm double-rocker mechanism not only enables the first swing arm to stably swing on the frame, but also enables the first swing arm to horizontally swing, so that the dampening solution in the water tank is relatively stable during the swinging process of the first swing arm and is not spilled or poured out.

[0019] Preferably, a first gear is arranged on the mounting shaft of the water outlet roller, a transmission gear is arranged on the connecting shaft of the first connecting rod and the frame, and the first gear is engaged with the transmission gear;

[0020] The mounting shaft of the metering roller is provided with a second gear, the first gear and the second gear are in transmission, and the second gear has a speed difference with the first gear. The water outlet roller and the metering roller are driving rollers, and the two are counter-rotating, and the metering roller has a speed difference with the water outlet roller to produce a small range of slip, so that the water outlet amount is large, and the metering roller transmits the dampening solution to the water roller.

[0021] As preferred, the first swing arm is connected with a first adjusting member for adjusting the pressure between the metering roller and the water outlet roller, the first adjusting member comprises a screw rod and a nut in threaded connection, the nut is rotationally arranged on the first swing arm, a connecting shaft is rotationally arranged on the second swing arm, the connecting shaft is arranged in parallel with the metering roller, and the screw rod is arranged in perpendicular with the connecting shaft and rotationally connected with the connecting shaft.

[0022] When the screw rod is rotated, the screw rod moves relative to the nut, the second swing arm swings relative to the first swing arm, so as to adjust the pressure between the metering roller and the water outlet roller; when the second driving member drives the second swing arm to swing, the nut rotates relative to the first swing arm, the connecting shaft swings relative to the second swing arm, and the distance between the screw rod and the first swing arm and the second swing arm remains unchanged, that is, after the pressure between the metering roller and the water outlet roller in the working state is adjusted, the metering roller and the water outlet roller will not be affected by the disengagement, and after the metering roller and the water outlet roller are disengaged, the pressure adjusted will not be affected when the metering roller and the water outlet roller are pressed again.

[0023] As preferred, the metering roller is provided with a second adjusting member for adjusting the pressure between the metering roller and the water roller, the second adjusting member comprises a cam and a first worm, the cam is rotationally connected with the mounting shaft of the metering roller, the cam comprises a raised section matched with the water roller and a worm section meshed with the screw rod, the worm section is coaxially arranged with the metering roller, and the first worm is rotationally arranged on the second swing arm. The first worm drives the cam to rotate, so as to adjust the pressure between the metering roller and the water roller, the raised section gradually turns to the water roller at the high point, so that the smaller the pressure between the metering roller and the water roller is, and vice versa.

[0024] As preferred, the third swing arm is provided with a circumferential pressing surface matched with the raised section of the cam. The raised section of the cam acts on the pressing surface of the third swing arm, the water roller is not directly pressed, the damage of the water roller is reduced, and the service life of the water roller is prolonged.

[0025] As preferred, the third swing arm is provided with a third adjusting member for adjusting the pressure between the dampening roller and the plate cylinder, the third adjusting member comprises a second worm and an eccentric gear engaged with each other, the eccentric shaft of the eccentric gear is rotatably mounted on the third swing arm, the mounting shaft of the dampening roller is rotatably connected with the eccentric gear, and the second worm is rotatably mounted on the third swing arm, and the eccentric gear is locked with the mounting shaft of the dampening roller during adjustment. The second worm drives the eccentric gear to rotate, so that the dampening roller rotates eccentrically, thereby adjusting the pressure between the dampening roller and the plate cylinder, and after the adjustment is completed, the dampening roller is unlocked and can rotate relative to the eccentric gear, and the two do not affect each other.

[0026] As preferred, the mounting shaft of the metering roller is rotatably connected with a third connecting rod, the third connecting rod is provided with an adjusting hole, and the end of the third connecting rod provided with the adjusting hole is sleeved outside the eccentric shaft, and the eccentric shaft has a moving gap in the adjusting hole. The third connecting rod plays a guiding and positioning role, so that the third swing arm swings stably and the dampening roller moves stably.

[0027] As preferred, an intermediate gear is arranged between the first gear and the second gear, and the swing shaft of the second swing arm on the first swing arm is coaxially arranged with the intermediate gear. When the second swing arm swings, the second gear of the metering roller and the intermediate gear rotate in pairs, and the two gears do not disengage, so that the transmission is stable. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The figure is a structural schematic diagram of the present application.

[0029] Figure 2 The figure is a sectional view of the present application.

[0030] Figure 3 The figure is a partial schematic diagram of the present application Figure 1 .

[0031] Figure 4 The figure is a partial schematic diagram of the present application Figure 2 .

[0032] Figure 5 The figure is a schematic diagram of the adjusting member of the present application.

[0033] Figure 6 The figure is a schematic diagram of the third connecting rod and the cam shaft of the present application. DETAILED DESCRIPTION

[0034] The relevant details and working principles of the embodiments and examples of the present application are described below in conjunction with the drawings. The water transmission mechanism of the offset printing machine comprises a water outlet roller 2, a metering roller 3, a water application roller 5 and a water string roller 4. The water outlet roller 2 is rotatably arranged on a first swing arm 21, the first swing arm is provided with a water tank 1, and the first swing arm is swingably arranged on a machine frame 7. The metering roller 3 is rotatably arranged on a second swing arm 22, and the second swing arm is swingably arranged on the first swing arm 21. The water application roller 5 is rotatably arranged on a third swing arm 23. The water string roller 4 is rotatably arranged on the machine frame. The third swing arm 23 is coaxially arranged with the water string roller 4, and the third swing arm 23 is rotatably arranged opposite to the water string roller 4, i.e. the third swing arm swings around the center of the water string roller. The water outlet roller 2 of the present application can be pressed together with the metering roller 3, the metering roller 3 can be pressed together with the water application roller 5, and the water application roller 5 can be pressed together with the plate cylinder 6. In different working conditions, the water outlet roller, the metering roller, the water application roller and the plate cylinder are in different states. In the printing working condition, the water outlet roller is pressed together with the metering roller, the metering roller is pressed together with the water application roller, and the water application roller is also pressed together with the water string roller and the plate cylinder. When the printing is temporarily stopped, the first swing arm 21 swings, and the water outlet roller 2, the metering roller 3, the water string roller 4 and the water application roller 5 move together, and the water application roller 5 is separated from the plate cylinder 6, so that the dampening solution cannot be transmitted to the plate cylinder. When the equipment is stopped, the first swing arm 21 swings, and the water outlet roller, the metering roller, the water string roller and the water application roller move together, and the water application roller is separated from the plate cylinder. The second swing arm 22 swings, and the metering roller moves together with the water application roller. The metering roller is separated from the water outlet roller. The third swing arm 23 swings, and the water application roller 5 moves and is separated from the metering roller 3. The rollers are in a separated state, the rollers are not pressed, are not easy to deform, and have a longer service life.

[0035] The first swing arm 21 is connected with a first driving element 11 for driving it to swing on the frame, and the first driving element is installed on the frame 7. The first swing arm 21 is provided with a first connecting rod 14 and a second connecting rod 15 which are rotatably arranged on the first swing arm 21. One end of the first connecting rod is coaxially arranged with the water outlet roller 2, and the other end of the first connecting rod is rotatably arranged on the frame 7, and the rotation point is point A. One end of the second connecting rod 15 is rotatably connected with the first swing arm 21, and the other end of the second connecting rod is rotatably arranged on the frame 7, and the rotation point is point B. The connecting points of the first connecting rod, the second connecting rod, the first swing arm and the frame form an equal-arm double rocker mechanism. The first driving element 11 is connected with one end of the first connecting rod or the second connecting rod. In the figure, the first driving element 11 is a pneumatic cylinder, and the piston rod of the pneumatic cylinder is connected with one end of the first connecting rod 14. When the piston rod of the pneumatic cylinder is extended, the first connecting rod swings counterclockwise with point A as the center, drives the first swing arm to swing with points A and B as the fulcrums, and drives the water outlet roller, the metering roller, the water string roller and the water receiving roller to move together with the first swing arm. The water receiving roller 5 is separated from the plate cylinder 6. The equal-arm double rocker mechanism not only enables the first swing arm to stably swing on the frame with points A and B as the fulcrums, but also enables the first swing arm to horizontally swing. In this way, the dampening solution in the water tank 1 remains stable during the swinging of the first swing arm and will not be spilled or poured out. The equal-arm double rocker mechanism can be a parallelogram or an isosceles trapezoid. The second swing arm 22 is connected with a second driving element 12 for driving it to swing on the first swing arm, and the second driving element is installed on the first swing arm 21. The third swing arm 23 is connected with a third driving element 13 for driving it to swing, and the third driving element is installed on the second swing arm. The second driving element and the third driving element can both be pneumatic cylinders. The first driving element, the second driving element and the third driving element respectively drive the first swing arm, the second swing arm and the third swing arm to swing, so that the rollers are in contact or separated from each other. When the complete separation operation is performed, the first swing arm is first swung, then the second swing arm is swung, and finally the third swing arm is swung.

[0036] A first gear 18 is arranged on the mounting shaft of the water outlet roller, a transmission gear 17 is arranged on the connecting shaft of the first connecting rod which is rotatably connected with the frame, the first gear is engaged with the transmission gear, a second gear 19 is arranged on the mounting shaft of the metering roller, the first gear and the second gear are in transmission, and the second gear 19 has a speed difference with the first gear 18. The water outlet roller and the metering roller are driving rollers, the two rollers are counter-rotated, the metering roller has a speed difference with the water outlet roller, a small range of slipping is generated, the water outlet amount is large, and the metering roller further transmits the dampening solution to the water receiving roller. An intermediate gear 20 is arranged between the first gear and the second gear, the swinging shaft 24 of the second swing arm 22 on the first swing arm is coaxially arranged with the intermediate gear, the second swing arm 22 swings, the second gear 19 of the metering roller is counter-rotated with the intermediate gear 20, the two gears are not separated, and the transmission is stable.

[0037] The first swing arm 21 is connected with a first adjusting member for adjusting the pressure between the metering roller and the water outlet roller, the first adjusting member comprises a screw rod 32 and a nut 31 which are connected by screwing, the nut is rotatably arranged on the first swing arm 21, a connecting shaft 33 is rotatably arranged on the second swing arm, the connecting shaft is arranged in parallel with the metering roller 3, the screw rod 32 is arranged in perpendicular with the connecting shaft and the screw rod is rotatably connected with the connecting shaft 33. When the screw rod is rotated, the screw rod moves relative to the nut, the screw rod drives the second swing arm to swing relative to the first swing arm, so as to adjust the pressure between the metering roller 3 and the water outlet roller 2; when the second driving member 12 drives the second swing arm to swing, the nut 31 rotates relative to the first swing arm, the connecting shaft 33 rotates relative to the second swing arm, and the distance between the connecting position of the screw rod and the first swing arm and the connecting position of the screw rod and the second swing arm remains unchanged, that is to say, after the pressure between the metering roller and the water outlet roller in the working state is adjusted, the metering roller and the water outlet roller will not be separated, and meanwhile, the second driving member will not affect the pressure between the metering roller and the water outlet roller when the metering roller and the water outlet roller are separated or attached.

[0038] The metering roller is provided with a second adjusting member for adjusting the pressure between the metering roller and the water receiving roller, the second adjusting member comprises a cam 34 and a first worm 36, the cam is rotatably connected with the mounting shaft of the metering roller, the cam comprises a raised section 37 matched with the water receiving roller and a worm section 35 meshed with the screw rod, the worm section is coaxially arranged with the metering roller 3, and the first worm 36 is rotatably arranged on the second swing arm 22. When the first worm is rotated, the cam 34 is driven to rotate, if the high point of the raised section is gradually turned to the water receiving roller 5, the pressure between the metering roller and the water receiving roller becomes smaller; when the first worm is reversely rotated, the low point of the raised section is gradually turned to the water receiving roller, the pressure between the metering roller and the water receiving roller becomes larger, and the water receiving roller receives more fountain solution. The third swing arm 23 is provided with a circumferential pressing surface 38 matched with the raised section of the cam, that is to say, the raised section of the cam is matched with the circumferential pressing surface on the third swing arm, the raised section 37 of the cam acts on the pressing surface 38 of the third swing arm, which is equivalent to acting on the water receiving roller, and the water receiving roller and its mounting shaft are not directly pressed, so as to reduce the damage of the water receiving roller and prolong the service life of the water receiving roller.

[0039] The third swing arm is provided with a third adjusting member for adjusting the pressure between the dampening roller and the plate cylinder, the third adjusting member comprises an eccentric gear 40 and a second worm 39, the eccentric shaft of the eccentric gear is rotatably arranged on the third swing arm 23, the mounting shaft of the dampening roller 5 is rotatably connected with the eccentric gear 40, and the second worm 39 is rotatably arranged on the third swing arm 23; during the adjustment, the eccentric gear 40 is locked with the mounting shaft of the dampening roller 5, the locking can be locked and locked, the second worm 39 is rotated, the second worm drives the eccentric gear 40 to rotate, the dampening roller 5 is driven to rotate eccentrically, the dampening roller is pressed to the plate cylinder 6, and the pressure between the dampening roller and the plate cylinder is increased, if the second worm is reversely rotated, the pressure between the dampening roller and the plate cylinder is reduced, the adjustment is completed, the dampening roller can rotate relative to the eccentric gear, and the dampening roller and the plate cylinder are not affected. The mounting shaft of the metering roller is rotatably connected with a third connecting rod 16, the third connecting rod is provided with an adjusting hole 25, the end of the third connecting rod provided with the adjusting hole is sleeved with the eccentric shaft 26 of the eccentric gear 40 outside, and the eccentric shaft has a moving gap in the adjusting hole; when the third swing arm 23 swings, the eccentric shaft of the eccentric gear moves in the adjusting hole 25, the third connecting rod 16 plays a guiding and positioning role, so that the third swing arm swings stably and the dampening roller moves stably. During the adjustment, the pressure between the dampening roller and the plate cylinder is first adjusted by the third adjusting member, then the pressure between the metering roller and the dampening roller is adjusted by the second adjusting member, and finally the pressure between the water roller and the metering roller is adjusted by the first adjusting member.

Claims

1. A water transfer mechanism for an offset printing machine, characterized in that: It includes a water outlet roller, a metering roller, a water application roller, and a water flow roller; The water outlet roller is rotatably mounted on a first swing arm, on which a water tank is installed. The first swing arm is oscillating on the frame and is connected to a first driving component that drives it to oscillate on the frame. The first driving component is mounted on the frame. A metering roller is rotatably mounted on a second swing arm, and the second swing arm is oscillatingly mounted on a first swing arm. The second swing arm is connected to a second driving member that drives it to oscillate on the first swing arm, and the second driving member is mounted on the first swing arm. The water-receiving roller is rotated on the third swing arm; A water-passing roller is rotatably mounted on a frame. The third swing arm is coaxially mounted with the water-passing roller and rotates relative to the water-passing roller. The third swing arm is connected to a third driving component that drives its swinging motion. The third driving component is mounted on the second swing arm. The first swing arm is connected to a first adjusting component that adjusts the pressure of the metering roller and the water outlet roller. The first adjusting component includes a screw and a nut that are threaded together. The nut is rotatably mounted on the first swing arm. A connecting shaft is rotatably mounted on the second swing arm. The connecting shaft is parallel to the metering roller. The screw is perpendicular to the connecting shaft and is rotatably connected to the connecting shaft. The metering roller is equipped with a second adjusting component to adjust the pressure between it and the water-receiving roller. The second adjusting component includes a cam and a first worm gear. The cam is rotatably connected to the mounting shaft of the metering roller. The cam includes a protruding section that cooperates with the water-receiving roller and a worm gear section that meshes with a screw. The worm gear section is coaxially arranged with the metering roller. The first worm gear is rotatably mounted on a second swing arm. The third swing arm is provided with a circumferential pressing surface that presses against the protruding section of the cam. The third swing arm is equipped with a third adjusting component for adjusting the pressure between the water-applying roller and the printing cylinder. The third adjusting component includes a meshing eccentric gear and a second worm gear. The eccentric shaft of the eccentric gear is rotatably mounted on the third swing arm. The mounting shaft of the water-applying roller is rotatably connected to the eccentric gear. The second worm gear is rotatably mounted on the third swing arm. During adjustment, the eccentric gear is locked to the mounting shaft of the water-applying roller.

2. The water transfer mechanism of the offset printing machine according to claim 1, characterized in that: The first swing arm is rotatably equipped with a first connecting rod and a second connecting rod; One end of the first connecting rod is coaxially arranged with the water outlet roller, and the other end of the first connecting rod is rotatably mounted on the frame. One end of the second connecting rod is rotatably connected to the first swing arm, and the other end of the second connecting rod is rotatably mounted on the frame; The connection points of the first link, the second link, the first swing arm, and the frame form an equal-arm double rocker mechanism, and the first driving member is connected to one end of the first link or the second link.

3. The water transfer mechanism of the offset printing machine according to claim 2, characterized in that: The water outlet roller is provided with a first gear on its mounting shaft, and a transmission gear is provided on the connecting shaft that rotatably connects the first connecting rod to the frame. The first gear meshes with the transmission gear. The metering roller is provided with a second gear on its mounting shaft. The first gear and the second gear are driven by each other, and there is a speed difference between the second gear and the first gear. An intermediate gear is provided between the first gear and the second gear, and the swing shaft of the second swing arm on the first swing arm is coaxially arranged with the intermediate gear.

4. The water transfer mechanism of the offset printing machine according to claim 1, characterized in that: The mounting shaft of the metering roller is rotatably connected to a third link. The third link has an adjustment hole. The end of the third link with the adjustment hole is sleeved outside the eccentric shaft, and the eccentric shaft has a movement clearance within the adjustment hole.

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