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CN-121990397-A - Paper positioning device for sheet-fed printing press

CN121990397ACN 121990397 ACN121990397 ACN 121990397ACN-121990397-A

Abstract

The invention belongs to the technical field of flat printing equipment, and particularly relates to a paper positioning device for a flat printing machine, which comprises a support frame, a positioning platen, a first strip-shaped opening and a second strip-shaped opening, wherein the positioning platen is fixed on the support frame, the first strip-shaped opening and the second strip-shaped opening are arranged on the positioning platen in parallel, support plates are slidably arranged in the second strip-shaped openings, the second positioning plates are slidably arranged in the first strip-shaped opening, the first positioning plates are fixedly arranged on the top sides of the corresponding support plates respectively, an installation box is arranged on the bottom side of the support frame, a spacing adjusting assembly is arranged on the installation box and connected with the two support plates, and a linkage assembly is arranged on the spacing adjusting assembly and connected with the second positioning plates. The invention has reasonable overall structure design and convenient operation and maintenance, has good adaptability to the positioning of paper with different specifications and thicknesses, and can effectively eliminate the influence of curl and self-stress existing in the paper on the positioning precision of the paper, thereby meeting the diversified printing production requirements.

Inventors

  • LI PENG
  • TANG SHIJIAN
  • CHEN KANG
  • REN ZHENG
  • LUO YUANJUN

Assignees

  • 四川蓝彩书美科技有限公司

Dates

Publication Date
20260508
Application Date
20260330

Claims (10)

  1. 1. A sheet positioning device for a sheet-fed printing press, comprising: a support (1); The positioning platen (11) is fixed on the support frame (1), a first strip-shaped opening (111) and two second strip-shaped openings (112) which are arranged in parallel are formed in the positioning platen (11), support plates (31) are slidably arranged in the two second strip-shaped openings (112), and a second positioning plate (4) is slidably arranged in the first strip-shaped opening (111); the first positioning plates (3) are respectively and fixedly arranged on the top sides of the corresponding support plates (31); the mounting box (2) is arranged at the bottom side of the supporting frame (1); the interval adjusting assembly is arranged on the mounting box (2) and is connected with the two support plates (31); The linkage assembly is arranged on the interval adjusting assembly and is connected with the second positioning plate (4); The contact sensors (301) are fixedly arranged on one side, close to each other, of the two first positioning plates (3); The blowing component is arranged above the supporting frame (1) and can be used for blowing and positioning paper on the positioning platen (11); and the photoelectric sensor (7) is arranged on the blowing component and is used for detecting whether paper exists on the positioning platen (11).
  2. 2. The paper positioning device for the sheet-fed printing press according to claim 1, wherein the distance adjusting assembly comprises a servo motor (52), a transmission gear (51) and two toothed plates (511), the two toothed plates (511) are slidably mounted on the mounting box (2), the two toothed plates (511) are fixedly connected with the corresponding support plates (31) respectively, the servo motor (52) is fixedly mounted on one side of the mounting box (2), a rotating shaft (5) is connected to an output shaft of the servo motor (52), and the transmission gear (51) meshed with the two toothed plates (511) is fixedly sleeved on the rotating shaft (5).
  3. 3. The paper positioning device for the sheet printing machine according to claim 1, wherein the linkage assembly comprises a supporting rod (53), guide pins (54) and lifting plates (41), the lifting plates (41) which are in sliding contact with the inner walls of the front side and the rear side of the installation box (2) are fixedly arranged on the bottom side of the second positioning plate (4), guide grooves are formed in the lifting plates (41), the supporting rod (53) is fixedly arranged at the end part of the rotating shaft (5) in the radial direction, the guide pins (54) are fixedly arranged on the supporting rod (53) in the radial direction, and the guide pins (54) are slidably arranged in the guide grooves.
  4. 4. The paper positioning device for the sheet-fed printing press according to claim 1, wherein the blowing assembly comprises a hollow plate (6), a variable frequency fan (61) and a plurality of blowing holes (62), four support columns (601) are fixedly arranged on the support frame (1), the hollow plate (6) is fixedly arranged at the top ends of the four support columns (601), the variable frequency fan (61) is fixedly arranged at the top side of the hollow plate (6), an air outlet of the variable frequency fan (61) is communicated with the hollow plate (6), a plurality of blowing holes (62) which are arrayed in a circumferential array shape with the middle point of the top side of the positioning table plate (11) as the center are formed in the inner wall of the bottom of the hollow plate (6), and the photoelectric sensor (7) is fixedly arranged at the bottom side of the hollow plate (6).
  5. 5. A sheet positioning apparatus for a sheet printing press according to claim 4, wherein the angle between the axis of the plurality of air blowing holes (62) and the axis of the midpoint of the top side of the positioning platen (11) increases in order from inside to outside, and the inclination angle of the plurality of air blowing holes (62) other than the air blowing hole (62) at the center position is in the range of 15 to 30 degrees.
  6. 6. The paper positioning device for a sheet-fed printing press according to claim 1, wherein the positioning platen (11) has a through hole at a midpoint thereof, and the positioning platen (11) has a plurality of radially arranged air guide grooves centered on the through hole.
  7. 7. A paper positioning device for a sheet-fed printing press according to claim 3, wherein a fixing plate (21) is fixedly arranged in the mounting box (2), a mounting opening is formed in the fixing plate (21), a bearing is fixedly arranged in the mounting opening, and an inner ring of the bearing is fixedly sleeved outside the rotating shaft (5).
  8. 8. A sheet positioning device for a sheet printing machine according to claim 3, wherein the second positioning plate (4) and the lifting plate (41) are provided with cavities on one side far away from the first positioning plate (3).
  9. 9. A paper positioning device for a sheet-fed printing press according to claim 1, wherein the elastic cushion is fixedly mounted on one side of each of the two positioning plates (3) which are adjacent to each other, the thickness of the elastic cushion is 3-5mm, and the plurality of contact sensors (301) are respectively embedded and fixed in the elastic cushion on the corresponding side.
  10. 10. A paper positioning device for a sheet-fed printing press according to claim 1, wherein the top parts of both sides of the mounting box (2) are fixedly provided with strip-shaped plates (22), and both strip-shaped plates (22) are fixed on the bottom side of the supporting frame (1) through at least two bolts.

Description

Paper positioning device for sheet-fed printing press Technical Field The invention relates to the technical field of sheet printing equipment, in particular to a paper positioning device for a sheet printing machine. Background In the sheet printing process, accurate positioning of the paper is a key element for ensuring printing quality. The traditional paper positioning device is easy to cause the situation that the paper is extruded and deformed when the positioning adjustment is carried out on the single paper. The Chinese patent literature of the prior authorized publication number CN218753861U announces a high-precision paper positioning mechanism for a printing machine, the core positioning structure is a combination of a positioning roller, a movable frame and a paper guide roller, and simultaneously, a motor is adopted to drive a double screw rod to drive the movable frame to control the positioning roller to limit paper. The Chinese patent literature of the prior authorized publication number CN219906259U announces a high-precision paper positioning mechanism for a printing machine, the core positioning mechanism adopts a mode of matching a U-shaped seat, a supporting roller, a limiting plate and a gear, and meanwhile, the mechanism drives the limiting plate to slide through the gear, and the paper is positioned in an auxiliary mode of a flattening mechanism. However, the prior art represented by the above patent still has the technical problems that in the process of being applied to sheet printing, the accurate positioning of the paper is generally performed only from the front side and the rear side of the paper conveying direction to prevent the deviation phenomenon, and meanwhile, the adjustment is performed in an independent driving mode, meanwhile, in practical application, the situation that the paper with possibly existing warping and internal stress cannot be effectively positioned easily occurs, and meanwhile, the capability of effectively eliminating the warping and internal stress of the paper can not be provided, so that the effect of final printing can be influenced. Accordingly, the present invention provides a paper positioning device for a sheet-fed printing press to solve the above-mentioned problems. Disclosure of Invention The invention aims to solve the defects of the prior art and provides a paper positioning device for a sheet-fed printing machine. The technical aim of the invention is achieved by the following technical scheme that the paper positioning device for the sheet-fed printing machine comprises: a support frame; the positioning platen is fixed on the support frame, a first strip-shaped opening and a second strip-shaped opening which are arranged in parallel are formed in the positioning platen, support plates are slidably arranged in the second strip-shaped openings, and the second positioning plate is slidably arranged in the first strip-shaped opening; The first positioning plates are fixedly arranged on the top sides of the corresponding support plates respectively; the mounting box is arranged at the bottom side of the support frame; The interval adjusting assembly is arranged on the mounting box and connected with the two support plates; the linkage assembly is arranged on the interval adjusting assembly and is connected with the two positioning plates; The contact sensors are respectively and fixedly arranged on one side, close to each other, of the two positioning plates; The blowing component is arranged above the supporting frame, and can be used for blowing and positioning paper on the positioning platen; and the photoelectric sensor is arranged on the blowing component and is used for detecting whether paper exists on the positioning platen. Preferably, the interval adjusting assembly comprises a servo motor, a transmission gear and two toothed plates, wherein the two toothed plates are slidably arranged on the mounting box and fixedly connected with the corresponding support plates respectively, one side of the mounting box is fixedly provided with the servo motor, the output shaft of the servo motor is connected with a rotating shaft, and the transmission gear meshed with the two toothed plates is fixedly sleeved on the rotating shaft. Preferably, the linkage assembly comprises a supporting rod, a guide pin and a lifting plate, the lifting plate which is in sliding contact with the inner walls of the front side and the rear side of the installation box is fixedly arranged at the bottom side of the positioning plate II, a guide groove is formed in the lifting plate, the supporting rod is radially and fixedly arranged at the end part of the rotating shaft, the guide pin is radially and fixedly arranged on the supporting rod, and the guide pin is slidably arranged in the guide groove. Preferably, the blowing component comprises a hollow plate, a variable frequency fan and a plurality of blowing holes, four supporting columns are fixedly arranged on the