Paper conveying device for lithographic printing machine

Abstract

The utility model relates to the technical field of lithographic printing, and discloses a paper conveying device for a lithographic printing machine, which comprises a conveying table, crankshafts are rotatably connected to two sides of the conveying table, conveying rollers are fixedly sleeved outside the crankshafts at equal intervals, a compression roller is rotatably connected above the conveying rollers through a connecting seat, and the compression roller is fixedly connected with the conveying table. The distance adjusting assembly comprises supports fixedly connected to the two sides of the conveying table, a lead screw is rotationally connected to the center of the top of a connecting base and is in threaded connection with the supports on the same side, a transmission rod is rotationally connected to one side of each support, and the anti-deviation assembly comprises hollow pipes fixedly connected to the bottom of the conveying table at equal intervals. Piston plates are symmetrically and movably connected to the interior of the hollow pipe, connecting rods are fixedly connected to the exteriors of the piston plates, sleeves are movably arranged on the exteriors of the crankshafts at equal intervals in a sleeving mode, connecting rods are symmetrically hinged between the sleeves and the connecting rods on the same sides through hinge pieces, and the applicability and practicability of the device are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithographic printing, in particular to a paper feeding device for a lithographic printing machine. Background Art

[0002] A lithographic printing machine is a printing device that applies printing ink on the surface of a flat plate and transfers the printing pattern to the surface of the printed matter through pressure and friction. When a lithographic printing machine is printing, it is necessary to convey paper, so a special paper feeding device is required.

[0003] In a Chinese utility model patent with the publication number CN216403197U, a paper supply device for a printing machine is disclosed. This device can gradually convey paper between multiple paper pressing rollers by using two paper feeding rollers, and can convey the flattened and dust-removed paper to the printing part of the printing machine for printing processing. Regarding the above related technology, the inventor believes that there are the following defects:

[0004] When this device is actually used, since the distances between the two groups of paper feeding rollers and the two groups of paper delivery rollers are fixed, it is not convenient to adjust them, making it difficult for the device to convey papers of different thicknesses, thus reducing the applicability of the device. Therefore, we provide a paper feeding device for a lithographic printing machine. Content of the Utility Model

[0005] To solve the problem in the above background art that the distances between the two groups of paper feeding rollers and the two groups of paper delivery rollers are not convenient to adjust, resulting in a reduction in the applicability of the device, the utility model provides a paper feeding device for a lithographic printing machine.

[0006] The utility model is realized by adopting the following technical solutions: A paper feeding device for a lithographic printing machine, comprising:

[0007] A conveying table, both sides of the conveying table are rotatably connected with crankshafts, one end of each crankshaft is coaxially and fixedly connected with a motor, the outer parts of the crankshafts are equidistantly and fixedly sleeved with conveying rollers, and a pressing roller is rotatably connected above the conveying rollers through a connecting seat;

[0008] A spacing adjusting assembly, the spacing adjusting assembly includes brackets fixedly connected to both sides of the conveying table, a lead screw is rotatably connected to the center of the top of the connecting seat and is in threaded connection with the bracket on the same side, a transmission rod is rotatably connected to one side of the bracket, the outer parts of the other ends of the crankshafts and the bottom ends of the transmission rods are fixedly sleeved with bevel gears I and the bevel gears I are meshed with each other, one end of the pressing roller is coaxially and fixedly connected with a bevel gear II, a connecting plate is fixedly connected to one side of the connecting seat, a bevel gear ring is rotatably connected to the connecting plate and is meshed with the bevel gear II and is movably connected with the transmission rod;

[0009] Anti-offset component, the anti-offset component includes hollow tubes fixedly connected to the bottom of the conveying table at equal intervals, piston plates are symmetrically and movably connected inside the hollow tubes, connecting rods are fixedly connected to the outside of the piston plates, sleeves are movably sleeved on the outside of the crankshaft at equal intervals, and connecting rods are symmetrically hinged between the sleeve and the connecting rod on the same side through hinge members. Exhaust pipes are symmetrically and fixedly communicated with the bottom of the hollow tube, and intake pipes are symmetrically and fixedly communicated with the top of the hollow tube and the intake pipes penetrate through the conveying table.

[0010] As a further improvement of the above solution, the top of the conveying roller is on the same horizontal line as the upper surface of the conveying table.

[0011] As a further improvement of the above solution, guide rods are symmetrically and fixedly connected to the top of the connecting seat and are slidably connected between the guide rods and the bracket.

[0012] As a further improvement of the above solution, limiting strips are symmetrically and fixedly connected to the outside of the transmission rod, limiting grooves are symmetrically formed on the inner side surface of the bevel gear ring and are slidably connected with the limiting strips.

[0013] As a further improvement of the above solution, a partition is fixedly connected to the center of the hollow tube.

[0014] As a further improvement of the above solution, one-way valves are respectively arranged inside the intake pipe and the exhaust pipe. The opening direction of the one-way valve inside the intake pipe is consistent with the air inflow direction, and the opening direction of the one-way valve inside the exhaust pipe is consistent with the air outflow direction.

[0015] As a further improvement of the above solution, the end of the intake pipe is flush with the upper surface of the conveying table.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. By rotating the screw rod and with the sliding cooperation between the guide rod and the bracket, the present utility model can push the pressure roller to move vertically downward, so as to facilitate adjusting the distance between the pressure roller and the conveying roller according to papers with different thicknesses, and has a wide application range. At the same time, with the sliding cooperation between the limiting strip and the limiting groove, no matter how the height position of the pressure roller is adjusted, when the conveying roller rotates, the pressure roller can be driven to rotate simultaneously, thereby reducing the energy consumption of the device and having strong practicability.

[0018] 2. While the motor drives the conveying roller to rotate, the present utility model utilizes the movable cooperation between the sleeve and the crankshaft, and the hinge action between the sleeve and the connecting rod as well as between the connecting rod and the connecting rod, so that the crankshaft can drive the piston plate to perform horizontal reciprocating movement inside the hollow tube while rotating, thereby being able to suck air to achieve the adsorption effect on the paper. Furthermore, while preventing the paper from shifting during the conveying process, the energy consumption of the device is further reduced, and the practicability of the device is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0020] Figure 2 is a bottom three-dimensional structural schematic diagram of the present utility model;

[0021] Figure 3 is a longitudinal section three-dimensional structural schematic diagram of the hollow tube of the present utility model.

[0022] MAIN SYMBOL DESCRIPTION:

[0023] 1. Conveying table; 2. Crankshaft; 3. Conveying roller; 4. Pressing roller; 101. Lead screw; 102. Transmission rod; 103. First bevel gear; 104. Second bevel gear; 105. Bevel gear ring; 106. Guide rod; 107. Limit strip; 201. Hollow tube; 202. Piston plate; 203. Connecting rod; 204. Sleeve; 205. Link; 206. Exhaust pipe; 207. Intake pipe; 208. Partition plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, in combination with the drawings and the specific embodiments, the present utility model will be further described. It should be noted that on the premise of no conflict, the following described embodiments or technical features can be arbitrarily combined with each other to form new embodiments. Embodiment

[0025] Please refer to Figures 1-3 , a paper conveying device for a lithographic printing machine in this embodiment includes:

[0026] A conveying table 1, both sides of the conveying table 1 are rotatably connected with a crankshaft 2, one end of the crankshaft 2 is coaxially and fixedly connected with a motor, the outer part of the crankshaft 2 is equidistantly and fixedly sleeved with conveying rollers 3, the upper part of the conveying rollers 3 is rotatably connected with a pressing roller 4 through a connecting seat, and the top of the conveying rollers 3 is on the same horizontal line as the upper surface of the conveying table 1, which is convenient for conveying the paper;

[0027] Spacing adjustment component. The spacing adjustment component includes brackets fixedly connected to both sides of the conveying table 1. The center of the top of the connecting seat is rotatably connected to a lead screw 101, and the lead screw 101 is threadedly connected to the bracket on the same side. One side of the bracket is rotatably connected to a transmission rod 102. Fixed sleeves of bevel gears 103 are sleeved on the outer part of the other end of the crankshaft 2 and the outer part of the bottom end of the transmission rod 102, and the bevel gears 103 are meshed with each other. One end of the pressure roller 4 is coaxially and fixedly connected to a bevel gear 104. One side of the connecting seat is fixedly connected to a connecting plate. A bevel gear ring 105 is rotatably connected to the connecting plate. The bevel gear ring 105 is meshed with the bevel gear 104 and is movably connected to the transmission rod 102. Guide rods 106 are symmetrically and fixedly connected to the top of the connecting seat, and the guide rods 106 are slidably connected to the brackets, which can play a certain guiding role in the vertical movement of the pressure roller 4. Limit strips 107 are symmetrically and fixedly connected to the outer part of the transmission rod 102. Limit grooves are symmetrically formed on the inner side surface of the bevel gear ring 105 and are slidably connected to the limit strips 107. While facilitating the movement of the bevel gear ring 105 outside the transmission rod 102, it can also ensure the normal transmission between the two;

[0028] Anti-offset component. The anti-offset component includes hollow tubes 201 fixedly connected to the bottom of the conveying table 1 at equal intervals. Piston plates 202 are symmetrically and movably connected to the inside of the hollow tubes 201. Connecting rods 203 are fixedly connected to the outside of the piston plates 202. Sleeves 204 are movably sleeved on the outside of the crankshaft 2 at equal intervals. Connecting rods 205 are symmetrically hinged between the sleeves 204 and the connecting rods 203 on the same side through hinge parts. Exhaust pipes 206 are symmetrically and fixedly communicated with the bottom of the hollow tubes 201. Intake pipes 207 are symmetrically and fixedly communicated with the top of the hollow tubes 201, and the intake pipes 207 penetrate through the conveying table 1. Check valves are installed in the intake pipes 207 and the exhaust pipes 206. The opening direction of the check valve in the intake pipe 207 is consistent with the air inflow direction, and the opening direction of the check valve in the exhaust pipe 206 is consistent with the air outflow direction. The end of the intake pipe 207 is flush with the upper surface of the conveying table 1, which is convenient for conveying paper.

[0029] The implementation principle of a sheet feeding device for a lithographic printing press in an embodiment of this application is as follows: First, pass the paper through between the conveying roller 3 and the pressure roller 4, and then rotate the lead screw 101. By rotating the lead screw 101 and with the sliding fit between the guide rod 106 and the bracket, it is possible to push the pressure roller 4 vertically downward, so as to facilitate adjusting the distance between the pressure roller 4 and the conveying roller 3 according to papers of different thicknesses, with a wide range of applications. At the same time, during the process of the pressure roller 4 moving vertically downward, with the sliding fit between the limiting strip 107 and the limiting groove, it is possible to drive the bevel gear ring 105 to slide on the outside of the transmission rod 102. Then, start the motor. During the process of the motor driving the crankshaft 2 to rotate, it can drive the conveying roller 3 fixedly sleeved equidistantly on its outside to rotate counterclockwise together. At the same time, by the meshing action between the first bevel gears 103, the meshing action between the second bevel gears 104 and the bevel gear ring 105, and the limiting action between the limiting strip 107 and the limiting groove, it is possible to drive the pressure roller 4 to rotate clockwise simultaneously, so as to convey the paper. And during the rotation of the crankshaft 2, with the movable fit between the sleeve 204 and the crankshaft 2, and the hinged action between the sleeve 204, the connecting rod 203 and the connecting link 205, the crankshaft 2 can drive the piston plate 202 to move horizontally back and forth inside the hollow tube 201 while rotating, so as to suck air to achieve the adsorption effect on the paper, thereby preventing the paper from shifting during the conveying process and further reducing the energy consumption of the device. The suction force generated by the negative pressure can make the paper fit more closely to the surface of the conveying table 1. Due to the increase in friction, the paper is not easily skewed during conveying. Finally, print the conveyed paper. Embodiment

[0030] On the basis of Embodiment 1, a further improvement in this embodiment lies in that: A partition plate 208 is fixedly connected to the center of the hollow tube 201, which is convenient for partitioning the internal space of the hollow tube 201.

[0031] The above-mentioned implementation manners are only the preferred implementation manners of the present utility model, and cannot be used to limit the protection scope of the present utility model. Any non-substantial changes and substitutions made by those skilled in the art on the basis of the present utility model belong to the protection scope required by the present utility model.

Claims

1. A paper feeding device for a lithographic printing press, characterized in that: include: A conveying platform (1), wherein both sides of the conveying platform (1) are rotatably connected to a crankshaft (2), one end of the crankshaft (2) is coaxially fixedly connected to a motor, and a conveying roller (3) is equidistantly fixedly sleeved outside the crankshaft (2), and a pressure roller (4) is rotatably connected to the top of the conveying roller (3) via a connecting seat; A spacing adjustment component, the spacing adjustment component comprising brackets fixedly connected to both sides of the conveying platform (1), the top center of the connecting seat being rotatably connected to a screw rod (101), and the screw rod (101) is threadedly connected to the bracket on the same side, one side of the bracket is rotatably connected to a transmission rod (102), the other end of the crankshaft (2) and the bottom end of the transmission rod (102) are both fixedly sleeved with a bevel gear 1 (103), and the bevel gears 1 (103) are meshingly connected, one end of the pressure roller (4) is coaxially fixedly connected to a bevel gear 2 (104), one side of the connecting seat is fixedly connected to a connecting plate, the connecting plate is rotatably connected to a bevel gear ring (105), and the bevel gear ring (105) is meshingly connected to the bevel gear 2 (104) and is movably connected to the transmission rod (102); An anti-deviation component comprises a hollow tube (201) equidistantly fixedly connected to the bottom of a conveying platform (1), the interior of the hollow tube (201) is symmetrically and movably connected to a piston plate (202), the exterior of the piston plate (202) is fixedly connected to a connecting rod (203), the exterior of the crankshaft (2) is equidistantly and movably sleeved with a sleeve (204), a connecting rod (205) is symmetrically hinged between the sleeve (204) and the connecting rod (203) on the same side via a hinge, the bottom of the hollow tube (201) is symmetrically and fixedly connected to an exhaust pipe (206), the top of the hollow tube (201) is symmetrically and fixedly connected to an intake pipe (207), and the intake pipe (207) passes through the conveying platform (1).

2. A paper feeding device for a planographic printing press as claimed in claim 1, characterized in that: The top of the conveying roller (3) is on the same horizontal line as the upper surface of the conveying platform (1).

3. A paper feeding device for a planographic printing press as claimed in claim 1, characterized in that: A guide rod (106) is symmetrically fixedly connected to the top of the connection seat, and the guide rod (106) is slidably connected to the bracket.

4. A paper feeding device for a planographic printing press as claimed in claim 1, characterized in that: The outside of the transmission rod (102) is symmetrically fixedly connected to a limit strip (107), and the inner side surface of the bevel gear ring (105) is symmetrically provided with limit slots and is slidably connected to the limit strip (107).

5. A paper feeding device for a planographic printing press as claimed in claim 1, characterized in that: A partition plate (208) is fixedly connected to the center of the hollow tube (201).

6. A paper feeding device for a planographic printing press as claimed in claim 1, characterized in that: Both the air inlet pipe (207) and the exhaust pipe (206) are provided with a one-way valve inside. The opening direction of the one-way valve inside the air inlet pipe (207) is consistent with the air inflow direction, and the opening direction of the one-way valve inside the exhaust pipe (206) is consistent with the air outflow direction.

7. A paper feeding device for a planographic printing press as claimed in claim 1, characterized in that: The end of the pipe opening of the air inlet pipe (207) is flush with the upper surface of the conveying platform (1).

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