Unreeling device of rotary press

Abstract

The utility model relates to the field of rotary presses, in particular to an unwinding device of a rotary press, which comprises a first supporting plate, a pressing mechanism and a deviation rectifying mechanism, the pressing mechanism comprises a second supporting plate, the second supporting plate is fixed on the front side of the first supporting plate, and two fixing frames are fixed on the top of the second supporting plate. And sliding rods are connected into the two fixing frames in a sliding manner. Continuous pressing on paper is kept through the pressing mechanism, paper wrinkles are avoided, a gear in the deviation correcting mechanism rotates to drive a first rack and a second rack to move, then the first rack and the second rack drive two corresponding moving frames to move correspondingly, the two moving frames drive two corresponding limiting plates to move, and therefore the deviation correcting effect is achieved. Limiting and deviation rectifying of paper with different widths are met, the two limiting plates move on the outer side of the pressing shaft to drive the two corresponding brush rings to move, then the brush rings sweep off dust, paper scraps or other impurities on the surface of the pressing shaft, the pressing shaft is cleaned in time, and the flatness of the paper is improved.

Description

Technical Field

[0001] This utility model relates to the field of rotary printing presses, and in particular to an unwinding device for a rotary printing press. Background Technology

[0002] According to the patent document with publication number CN221051130U, the patent document uses a fixed sleeve that can move back and forth in the distance adjustment structure to make the tensioning shaft move accordingly. So when the paper or cloth on the air shaft is pulled, the tensioning shaft can prevent the paper or cloth from being too loose or too tight. When the paper or cloth is pulled normally, the tensioning shaft can be returned to its original position by the telescopic spring. Through the speed adjustment structure, when the tensioning shaft is away from the air shaft, the second friction cone wheel is brought into close contact with the friction belt under the action of the spring. The change in position of the second friction cone wheel can change the transmission ratio of the first friction cone wheel and the second friction cone wheel, so the cloth or paper wrapped on the tensioning shaft can change the rotation speed, thereby realizing the automatic adjustment of the tightness of the cloth or paper.

[0003] The patent document states that during the continuous unwinding of paper on the air shaft, uneven paper distribution or electrostatic adsorption can easily cause paper position shifts, leading to inaccurate printing patterns or paper damage. Furthermore, dust, paper scraps, or other impurities in the workshop may adhere to the surface of the tension shaft, increasing the friction between the paper and the tension shaft, thus causing paper wrinkles. Utility Model Content

[0004] The purpose of this invention is to provide an unwinding device for a rotary printing press in order to solve the above-mentioned problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] An unwinding device for a rotary printing press includes a first support plate, a pressing mechanism, and a web-correcting mechanism;

[0007] The clamping mechanism includes a second support plate, which is fixed to the front side of the first support plate. Two fixed frames are fixed to the top of the second support plate. Sliding rods are slidably connected in both fixed frames. A clamping shaft is rotatably connected between the tops of the two sliding rods. Springs are fixed to the bottoms of the two sliding rods.

[0008] The correction mechanism includes two limiting plates, both of which are sleeved on the outside of the clamping shaft. A movable frame is slidably connected to the bottom of the limiting plates. A gear is provided between the two movable frames. A first rack meshes at the top of the gear and a second rack meshes at the bottom of the gear. A brush ring is fixed on the side of the two limiting plates that are far apart from each other.

[0009] Preferably, an air shaft is rotatably connected to the front side of the first support plate, and a first motor is fixedly installed at the input end of the air shaft. The second support plate is located below one side of the first support plate.

[0010] Preferably, the two fixed frames have a first sliding groove for cooperating with the sliding rod, and the spring is located in the first sliding groove.

[0011] Preferably, the bottom of the limiting plate is provided with a second sliding groove, and a connecting rod that cooperates with the second sliding groove is fixed inside the movable frame.

[0012] Preferably, two movable frames are located on top of the second support plate, the first rack is fixed on the other side of the movable frame close to the first support plate, the second rack is fixed on the other side of the movable frame away from the first support plate, and the first rack is located on the upper side of the second rack.

[0013] Preferably, a second motor is fixedly installed at the gear input end, and the brush ring is located outside the clamping shaft.

[0014] The beneficial effects compared with the existing technology are as follows: The pressing mechanism maintains continuous pressure on the paper, avoiding paper wrinkles; the gear rotation in the correction mechanism drives the first and second racks to move, which in turn drives the two corresponding moving frames to move, thereby driving the two moving frames to move the two corresponding limiting plates, satisfying the limiting and correction of paper of different widths; the movement of the two limiting plates outside the pressing shaft drives the movement of the two corresponding brush rings, thereby sweeping off dust, paper scraps or other impurities from the surface of the pressing shaft, cleaning the pressing shaft in time, and improving the flatness of the paper. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the unwinding device of a rotary printing press according to the present invention;

[0017] Figure 2 This is a cross-sectional view of the unwinding device of a rotary printing press according to the present invention;

[0018] Figure 3 This is a schematic diagram of the pressing mechanism structure of the unwinding device of a rotary printing press according to the present invention;

[0019] Figure 4 This is a schematic diagram of the correction mechanism structure of the unwinding device of a rotary printing press according to the present invention;

[0020] Figure 5 This is a schematic diagram of the fixed frame and sliding rod structure of the unwinding device of a rotary printing press according to the present invention;

[0021] Figure 6 This is a schematic diagram of the limiting plate structure of the unwinding device of a rotary printing machine according to the present invention;

[0022] Figure 7 This is a schematic diagram of the movable frame structure of the unwinding device of a rotary printing press according to the present invention;

[0023] Figure 8 This is a schematic diagram of the brush ring structure of the unwinding device of a rotary printing press according to the present invention;

[0024] Figure 9 This is a partial sectional view of the unwinding device of a rotary printing press according to the present invention.

[0025] The annotations in the attached figures are explained as follows:

[0026] 1. First support plate; 2. Pressing mechanism; 201. Second support plate; 202. Fixed frame; 203. Sliding rod; 204. Spring; 205. Pressing shaft; 3. Correction mechanism; 301. Limiting plate; 302. Moving frame; 303. Gear; 304. First rack; 305. Second rack; 306. Brush ring; 4. Air shaft. Detailed Implementation

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The present invention will be further described below with reference to the accompanying drawings:

[0029] like Figures 1-9 As shown, an unwinding device for a rotary printing press includes a first support plate 1, a pressing mechanism 2, and a web-correcting mechanism 3.

[0030] In this embodiment: the clamping mechanism 2 includes a second support plate 201, which is fixed to the front side of the first support plate 1. An air shaft 4 is rotatably connected to the front side of the first support plate 1, and a first motor is fixedly installed at the input end of the air shaft 4. The second support plate 201 is located below one side of the first support plate 1. Two fixing frames 202 are fixed to the top of the second support plate 201, and sliding rods 203 are slidably connected in both fixing frames 202. First sliding grooves that cooperate with the sliding rods 203 are opened in the two fixing frames 202, and springs 204 are located in the first sliding grooves. A clamping shaft 205 is rotatably connected between the tops of the two sliding rods 203, and springs 204 are fixed to the bottoms of the two sliding rods 203. 4. The paper to be printed is supported by the air shaft 4. The first motor drives the air shaft 4 to rotate the paper to be printed. When the paper slackens between the air shaft 4 and the pressure shaft 205, the spring 204 pulls the sliding rod 203 to move the pressure shaft 205 downward, increasing the distance between the air shaft 4 and the pressure shaft 205. At this time, the paper returns to its original tension. When the paper is tightened between the air shaft 4 and the pressure shaft 205, the pressure shaft 205 moves the sliding rod 203 upward, the spring 204 is stretched, and the distance between the pressure shaft 205 and the air shaft 4 shortens, thus restoring the paper to its original tension. This ensures that the pressure shaft 205 always presses the conveyed paper.

[0031] In this embodiment: the correction mechanism 3 includes two limiting plates 301, both of which are sleeved on the outside of the clamping shaft 205. A movable frame 302 is slidably connected to the bottom of the limiting plate 301. A second sliding groove is provided at the bottom of the limiting plate 301. A connecting rod that cooperates with the second sliding groove is fixed inside the movable frame 302. A gear 303 is provided between the two movable frames 302. A first rack 304 meshes with the top of the gear 303, and a second rack 305 meshes with the bottom of the gear 303. The two movable frames 302 are located on the top of the second support plate 201. The first rack 304 is fixed on the other side of the movable frame 302 close to the first support plate 1, and the second rack 305 is fixed on the other side of the movable frame 302 away from the first support plate 1. The first rack 304 is located above the second rack 305. A brush ring 306 is fixed on the side of the two limiting plates 301 that are far apart from each other. A second motor is fixedly provided at the input end of the gear 303. The brush ring 306 is located on the clamping shaft 205. On the outer side of 05, the second motor drives the gear 303 to rotate. The gear 303 meshes with the first rack 304 and the second rack 305 simultaneously. The forward and reverse rotation of the gear 303 causes the first rack 304 and the second rack 305 to move closer and further apart, respectively. The first rack 304 and the second rack 305 drive the corresponding two moving frames 302 to move. Through the connecting column on the moving frame 302 and the second sliding groove on the limiting plate 301, the moving frame 302 can drive the limiting plate 301 to move without affecting the pressing shaft 205 to drive the limiting plate 301 to move up and down. Thus, the two moving frames 302 drive the corresponding two limiting plates 301 to move, adjusting the distance between the two limiting plates 301. The movement of the two limiting plates 301 outside the pressing shaft 205 drives the corresponding two brush rings 306 to move, thereby sweeping off the dust, paper scraps or other impurities on the surface of the pressing shaft 205.

[0032] Working principle: The paper to be printed is placed on the outside of the air shaft 4, and the paper is passed through the lower side of the pressing shaft 205 to be connected to the subsequent printing device. The second motor drives the gear 303 to rotate. The gear 303 meshes with the first rack 304 and the second rack 305 at the same time. Then the gear 303 rotates in the opposite direction, causing the first rack 304 and the second rack 305 to move away from each other. The first rack 304 and the second rack 305 respectively drive the corresponding two moving frames 302 to move. The connecting column on the moving frame 302 and the second sliding groove on the limiting plate 301 enable the moving frame 302 to drive the limiting plate 301 to move. Thus, the two moving frames 302 drive the corresponding two limiting plates 301 to move, adjusting the distance between the two limiting plates 301, thereby limiting and correcting the paper to be printed.

[0033] Printing begins. The first motor drives the air shaft 4 to rotate the paper to be printed. When the paper loosens between the air shaft 4 and the pressure shaft 205, the spring 204 pulls the sliding rod 203 to move the pressure shaft 205 downward, increasing the distance between the air shaft 4 and the pressure shaft 205. During this process, the pressure shaft 205 moves the two limit plates 301 downward and the second slide groove downward. When the paper between the air shaft 4 and the pressure shaft 205 is tightened, the pressure shaft 205 moves the sliding rod 203 upward, the spring 204 is stretched, and the distance between the pressure shaft 205 and the air shaft 4 shortens. During this process, the pressure shaft 205 moves the two limit plates 301 upward and the second slide groove upward.

[0034] After printing, the gear 303 rotates in the positive direction, causing the first rack 304 and the second rack 305 to move closer to each other. Then, the two limiting plates 301 move outside the pressing shaft 205, causing the corresponding two brush rings 306 to move, so that the brush rings 306 sweep off the dust, paper scraps or other impurities on the surface of the pressing shaft 205.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An unwinding device for a rotary printing press, comprising a first support plate (1), characterized in that: It also includes a clamping mechanism (2) and a correction mechanism (3); The pressing mechanism (2) includes a second support plate (201), which is fixed to the front side of the first support plate (1). Two fixed frames (202) are fixed on the top of the second support plate (201). Sliding rods (203) are slidably connected in both fixed frames (202). A pressing shaft (205) is rotatably connected between the tops of the two sliding rods (203). A spring (204) is fixed at the bottom of both sliding rods (203). The correction mechanism (3) includes two limiting plates (301), both of which are sleeved on the outside of the clamping shaft (205). A movable frame (302) is slidably connected to the bottom of the limiting plate (301), and a gear (303) is provided between the two movable frames (302). A first rack (304) is meshed at the top of the gear (303), and a second rack (305) is meshed at the bottom of the gear (303). A brush ring (306) is fixed on the side of the two limiting plates (301) that are far apart from each other.

2. The unwinding device for a rotary printing press according to claim 1, characterized in that: The first support plate (1) is rotatably connected to an air shaft (4) on its front side. The input end of the air shaft (4) is fixedly equipped with a first motor. The second support plate (201) is located below one side of the first support plate (1).

3. The unwinding device for a rotary printing press according to claim 1, characterized in that: The two fixed frames (202) are provided with first sliding grooves that cooperate with the sliding rod (203), and the spring (204) is located in the first sliding groove.

4. The unwinding device for a rotary printing press according to claim 1, characterized in that: The bottom of the limiting plate (301) is provided with a second sliding groove, and the movable frame (302) is fixed with a connecting rod that cooperates with the second sliding groove.

5. The unwinding device for a rotary printing press according to claim 1, characterized in that: Two movable frames (302) are located on top of the second support plate (201). The first rack (304) is fixed on the other side of the movable frame (302) near the first support plate (1), and the second rack (305) is fixed on the other side of the movable frame (302) away from the first support plate (1). The first rack (304) is located on the upper side of the second rack (305).

6. The unwinding device for a rotary printing press according to claim 1, characterized in that: The input end of the gear (303) is fixedly equipped with a second motor, and the brush ring (306) is located outside the clamping shaft (205).

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