Front-back double-servo device for screen printing machine

Abstract

The utility model relates to the field of screen printing machines, and discloses a front-back double-servo device for a screen printing machine, a front paper pulling head comprises two front supports which are symmetrically arranged, the two front supports are fixed at the left end of a pneumatic screen printing machine through fixing plates, and a front conveying roller is rotatably arranged between the two front supports through a bearing; the front paper pulling head comprises two rear supports installed at the right end of the pneumatic screen printing machine, a rear conveying roller is rotatably installed between the two rear supports through a bearing, and the rear conveying roller is rotatably installed on the left side of the rear conveying roller through a bearing. The front paper pulling head and the rear paper pulling head are arranged at the left end and the right end of the pneumatic screen printing machine respectively, double-servo material pulling is adopted for the front paper pulling head and the rear paper pulling head, then the tension balance of materials in the feeding process is controlled, namely, the tension balance of the materials located at the front paper pulling head and the rear paper pulling head is achieved, and the precision of secondary nesting can be improved.

Description

Technical Field

[0001] The utility model relates to the field of screen printing machines, in particular to a front and rear double servo device for a screen printing machine. Background Technique

[0002] When part of the material is screen printed, generally a unwinding mechanism and a winding mechanism are respectively arranged at the left and right ends of the screen printing machine. The unwinding mechanism enables the coiled material to be unwound and move to the right under the action of the winding mechanism, so that the material is conveyed under the screen and then printed. This structure requires the cooperation of the unwinding mechanism and the winding mechanism when loading the printing substrate, and the printed material must also be wound. When performing secondary nested material printing, it is also necessary to unwind and rewind again. If only one set of unwinding and winding mechanisms is used, or two sets of screen printing machines are placed between the unwinding and winding mechanisms, it is difficult to ensure the tension balance of the material during the conveying process, and the printing accuracy cannot be guaranteed either. For this reason, we have designed a front and rear double servo device for a screen printing machine. Content of the Utility Model

[0003] To solve the technical problems that it is difficult to ensure the tension balance of the material during the conveying process and the printing accuracy cannot be guaranteed, the utility model provides a front and rear double servo device for a screen printing machine.

[0004] The utility model is realized by adopting the following technical solutions: A front and rear double servo device for a screen printing machine, including a pneumatic screen printing machine, and a front paper pulling head and a rear paper pulling head are respectively installed at the left and right ends of the pneumatic screen printing machine;

[0005] Among them, the front paper pulling head includes two symmetrically arranged front brackets. Both of the two front brackets are fixed to the left end of the pneumatic screen printing machine through fixing plates, and a front conveying roller is rotatably installed between the two front brackets through bearings. A pressure roller is rotatably installed on the left side of the front conveying roller, and two rotatable pressure wheels 1 are symmetrically arranged above the left upper part of the front conveying roller. A chasing mark sensor is also slidably arranged above the right upper part of the front conveying roller;

[0006] The rear paper pulling head includes two rear brackets installed at the right end of the pneumatic screen printing machine. A rear conveying roller is rotatably installed between the two rear brackets through bearings, and two rotatable pressure wheels 2 are symmetrically installed above and below the right upper part of the rear conveying roller.

[0007] As a further improvement of the above solution, a support plate is installed above between the two front brackets. The upper end surface of the support plate is tangent to the outer surface above the front conveying roller, and the left and right ends of the upper surface of the support plate are designed with rounded corners to form arc surfaces. The material after passing through the front conveying roller can be directly placed above the support plate and finally conveyed above the pneumatic screen printing machine for printing.

[0008] As a further improvement of the above solution, a transverse rail is installed at the outer end of each of the two front brackets. A transverse sliding seat is slidably arranged left and right above the transverse rail. A longitudinal rail is installed between the two transverse sliding seats. A longitudinal sliding seat is slidably arranged back and forth on the longitudinal rail. The tracking sensor is installed on the longitudinal sliding seat, and the position of the tracking sensor can be adjusted accordingly as needed, so as to perform feeding and positioning of the material, ensuring the nesting accuracy.

[0009] As a further improvement of the above solution, a first mounting shaft is rotatably installed at the upper left of the two front brackets. A first mounting roller seat is slidably sleeved at both the front and rear ends of the first mounting shaft. The first pressing wheel is rotatably installed on the first mounting roller seat through a bearing. The first pressing wheel can make the material fit on the surface of the front conveying roller, so as to enable the material to have a force moving to the right, enabling it to move to the right.

[0010] A mounting rotating shaft is rotatably installed at the upper left of the two front brackets. Second mounting roller seats are fixed at both the front and rear ends of the mounting rotating shaft. The pressing roller is rotatably installed on the two second mounting roller seats through bearings, which can make the material fit on the surface of the front conveying roller, so as to enable the material to have a force moving to the right.

[0011] As a further improvement of the above solution, two rotatably designed second mounting shafts are symmetrically installed at the upper right and lower right of the rear conveying roller. A third mounting roller seat is slidably sleeved at both the front and rear ends of the second mounting shaft. A second pressing wheel is rotatably installed on the second mounting roller seat through a bearing, which can make the material fit on the surface of the rear conveying roller, so as to enable the material to have a force moving to the right.

[0012] As a further improvement of the above solution, wrenches are provided at the rear ends of the first mounting shaft, the second mounting shaft and the mounting rotating shaft. The first mounting roller seat, the second mounting roller seat and the third mounting roller seat are respectively eccentrically arranged on the corresponding first mounting shaft, mounting rotating shaft and second mounting shaft. The first mounting roller seat, the second mounting roller seat and the third mounting roller seat have the same structure, which is a disc structure, and a round hole is opened at a position deviating from the center of the circle above it. The first mounting shaft, the second mounting shaft and the mounting rotating shaft are fixed to the round hole, and the axles of the first pressing wheel, the pressing roller and the second pressing wheel are collinear with the center of the disc. When the wrench is turned, the distances between the first pressing wheel, the pressing roller and the second pressing wheel and the front conveying roller and the rear conveying roller can be changed, so as to be applicable to materials of various thicknesses. Moreover, the positions of the first pressing wheel and the second pressing wheel can be adjusted, so that the first pressing wheel and the second pressing wheel can be pressed on the two side edges or other positions of the material, avoiding damage to the printed position and causing the pattern to be blurred.

[0013] As a further improvement of the above solution, the rear end of the front conveying roller is connected to the output shaft of an external servo motor I through a coupling, and the rear end of the rear conveying roller is connected to the output shaft of an external servo motor II through a coupling. Moreover, the servo motor I and the servo motor II rotate synchronously, and the front conveying roller and the rear conveying roller rotate synchronously, thereby enabling the material to move stably to the right, ensuring the tension balance of the material, and improving the accuracy of secondary nesting.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. By respectively arranging a front paper pulling head and a rear paper pulling head at the left and right ends of the pneumatic screen printing machine, both of which adopt double-servo paper pulling to control the tension balance of the material during the feeding process, that is, the tension balance of the material in the front paper pulling head and the rear paper pulling head parts, the accuracy of secondary nesting can be improved;

[0016] 2. By arranging a pressing wheel I and a pressing roller on the front paper pulling head, and a pressing wheel II on the rear paper pulling head, they can make the material fit on the surfaces of the front conveying roller and the rear conveying roller, thereby providing corresponding pulling forces to enable the material between the front conveying roller and the rear conveying roller to move stably. The distances between the pressing wheel I, the pressing roller, the pressing wheel II and the front conveying roller and the rear conveying roller can be adjusted according to needs, and thus it is applicable to materials of various thicknesses. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of the overall structure of a front and rear double-servo device for a screen printing machine provided by the present utility model;

[0018] Figure 2 is Figure 1 the isometric view of;

[0019] Figure 3 is Figure 1 the schematic diagram of the front paper pulling head in;

[0020] Figure 4 is Figure 3 the front and rear isometric view of;

[0021] Figure 5 is Figure 1 the schematic diagram of the rear paper pulling head in;

[0022] Figure 6 is Figure 5 the front and rear isometric view of.

[0023] Main Symbol Explanation:

[0024] 1. Pneumatic screen printing machine; 2. Front paper pulling head; 21. Front support; 211. Support plate; 22. Fixed plate; 23. Tracking sensor; 231. Horizontal track; 232. Horizontal sliding seat; 233. Vertical track; 234. Vertical sliding seat; 24. Mounting shaft one; 25. Pressing wheel one; 251. Mounting roller seat one; 26. Pressing roller; 261. Mounting roller seat two; 27. Front conveying roller; 3. Rear paper pulling head; 31. Rear support; 32. Rear conveying roller; 33. Mounting shaft two; 34. Pressing wheel two; 341. Mounting roller seat three. Specific embodiments

[0025] Next, in combination with the accompanying drawings and specific embodiments, the present invention 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 to form new embodiments.

[0026] Embodiment:

[0027] Please refer to Figures 1-6 , A front and rear double servo device for a screen printing machine in this embodiment includes a pneumatic screen printing machine 1, and a front paper pulling head 2 and a rear paper pulling head 3 are respectively installed at the left and right ends of the pneumatic screen printing machine 1;

[0028] Among them, the front paper pulling head 2 includes two symmetrically arranged front supports 21. Both front supports 21 are fixed to the left end of the pneumatic screen printing machine 1 through a fixed plate 22. A front conveying roller 27 is rotatably installed between the two front supports 21 through a bearing. A pressing roller 26 is rotatably installed on the left side of the front conveying roller 27. And two rotatable pressing wheels one 25 are symmetrically arranged above the left upper part of the front conveying roller 27. A tracking sensor 23 is also slidably arranged above the right upper part of the front conveying roller 27;

[0029] The rear paper pulling head 3 includes two rear supports 31 installed at the right end of the pneumatic screen printing machine 1. A rear conveying roller 32 is rotatably installed between the two rear supports 31 through a bearing. Two rotatable pressing wheels two 34 are symmetrically installed above and below the right upper part of the rear conveying roller 32.

[0030] A support plate 211 is installed above between the two front supports 21. The upper end surface of the support plate 211 is tangent to the outer surface of the front conveying roller 27 above. And the left and right ends of the upper surface of the support plate 211 are designed with rounded corners to form arc surfaces. The material after passing through the front conveying roller 27 can be directly placed above the support plate 211 and finally conveyed above the pneumatic screen printing machine 1 for printing.

[0031] Transverse rails 231 are installed at the outer ends of both of the two front brackets 21. A transverse slide 232 is slidably arranged left and right above the transverse rails 231. A longitudinal rail 233 is installed between the two transverse slides 232. A longitudinal slide 234 is slidably arranged back and forth on the longitudinal rail 233. The tracking sensor 23 is installed on the longitudinal slide 234, and the position of the tracking sensor 23 can be adjusted accordingly as needed, so as to perform feeding and positioning of the material, ensuring the nesting accuracy.

[0032] A mounting shaft one 24 is rotatably installed above the left of the two front brackets 21. Mounting roller seats one 251 are slidably sleeved at both the front and rear ends of the mounting shaft one 24. The pressing wheel one 25 is rotatably installed on the mounting roller seat one 251 through a bearing. The pressing wheel one 25 can make the material fit on the surface of the front conveying roller 27, so as to enable the material to have a force moving to the right, enabling it to move to the right.

[0033] A mounting rotating shaft is rotatably installed above the left of the two front brackets 21. Mounting roller seats two 261 are fixed at both the front and rear ends of the mounting rotating shaft. The pressing roller 26 is rotatably installed on the two mounting roller seats two 261 through a bearing, and can make the material fit on the surface of the front conveying roller 27, so as to enable the material to have a force moving to the right.

[0034] Two rotatably designed mounting shafts two 33 are symmetrically installed above and below the upper right of the rear conveying roller 32. Mounting roller seats three 341 are slidably sleeved at both the front and rear ends of the mounting shaft two 33. The pressing wheel two 34 is rotatably installed on the mounting roller seat two 261 through a bearing, and can make the material fit on the surface of the rear conveying roller 32, so as to enable the material to have a force moving to the right.

[0035] Wrenches are arranged at the rear ends of the mounting shaft one 24, the mounting shaft two 33 and the mounting rotating shaft. And the mounting roller seats one 251, the mounting roller seats two 261 and the mounting roller seats three 341 are eccentrically arranged on the corresponding mounting shaft one 24, the mounting rotating shaft and the mounting shaft two 33 respectively. The structures of the mounting roller seats one 251, the mounting roller seats two 261 and the mounting roller seats three 341 are the same, all being a disc structure, and a circular hole is opened at a position deviating from the center above it. The mounting shaft one 24, the mounting shaft two 33 and the mounting rotating shaft are fixed to the circular hole, while the axles of the pressing wheel one 25, the pressing roller 26 and the pressing wheel two 34 are collinear with the center of the disc. When the wrench is turned, the distances between the pressing wheel one 25, the pressing roller 26 and the pressing wheel two 34 and the front conveying roller 27 and the rear conveying roller 32 can be changed, so as to be applicable to materials of various thicknesses. And the positions of the pressing wheel one 25 and the pressing wheel two 34 can be adjusted, so that the pressing wheel one 25 and the pressing wheel two 34 can be pressed on the two side edges or other positions of the material, avoiding damage to the printed position and causing the pattern to be blurred.

[0036] The rear end of the front conveying roller 27 is connected to the output shaft of an external servo motor one through a coupling, and the rear end of the rear conveying roller 32 is connected to the output shaft of an external servo motor two through a coupling. The servo motor one and the servo motor two rotate synchronously, and the front conveying roller 27 and the rear conveying roller 32 rotate synchronously, so that the material moves stably to the right, ensuring the tension balance of the material and improving the accuracy of secondary nesting.

[0037] In the embodiment of the present application, the implementation principle of the front and rear double servo device for a screen printing machine is as follows: The material passes through the front paper pulling head 2, the pneumatic screen printing machine 1, and the rear paper pulling head 3 only once from the left, and the pressing wheel one 25, the pressing roller 26, and the pressing wheel two 34 are attached to the upper surface of the material. After turning on the power supplies of the servo motor one and the servo motor two, the front conveying roller 27 and the rear conveying roller 32 will rotate synchronously, so that the material can move synchronously to the left, and the tension balance of the material can always be ensured during the conveying process, making the printing nesting more accurate.

[0038] By respectively arranging the front paper pulling head 2 and the rear paper pulling head 3 at the left and right ends of the pneumatic screen printing machine 1, and both of them adopt double servo material pulling, the tension balance of the material during the feeding process is controlled, that is, the tension balance of the material in the part of the front paper pulling head 2 and the rear paper pulling head 3, and the accuracy of secondary nesting can be improved.

[0039] By arranging the pressing wheel one 25 and the pressing roller 26 on the front paper pulling head 2, and the pressing wheel two 34 on the rear paper pulling head 3, they can make the material fit on the surfaces of the front conveying roller 27 and the rear conveying roller 32, so as to provide corresponding pulling forces, enabling the material between the front conveying roller 27 and the rear conveying roller 32 to move stably. The distances between the pressing wheel one 25, the pressing roller 26, the pressing wheel two 34 and the front conveying roller 27 and the rear conveying roller 32 can be adjusted as needed, so as to be applicable to materials of various thicknesses.

[0040] The above implementation manners are only the preferred implementation manners of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention belong to the protection scope required by the present invention.

Claims

1. A front and rear dual servo device for a screen printing machine, comprising a pneumatic screen printing machine (1), characterized in that: The pneumatic screen printing machine (1) is provided with a front paper pulling head (2) and a rear paper pulling head (3) at the left and right ends respectively; The front paper pulling head (2) comprises two symmetrically arranged front brackets (21), the two front brackets (21) are fixed to the left end of the pneumatic screen printing machine (1) through a fixing plate (22), and a front conveying roller (27) is rotatably installed between the two front brackets (21) through a bearing, a pressure roller (26) is rotatably installed on the left side of the front conveying roller (27), and two rotating pressure wheels (25) are symmetrically arranged on the upper left of the front conveying roller (27), and a tracking sensor (23) is also slidably arranged on the upper right of the front conveying roller (27); The rear paper pulling head (3) comprises two rear brackets (31) mounted on the right end of the pneumatic screen printing machine (1), a rear conveying roller (32) is rotatably mounted between the two rear brackets (31) via a bearing, and two rotating pressure wheels (34) are symmetrically mounted on the upper right and lower right sides of the rear conveying roller (32). 。 2. A front and rear dual servo device for a screen printing machine as claimed in claim 1, characterized in that: A support plate (211) is installed above the two front brackets (21), the upper end surface of the support plate (211) is tangent to the upper surface of the outer ring of the front conveying roller (27), and the left and right edges of the upper surface of the support plate (211) are both chamfered to form an arc surface.

3. A front and rear dual servo device for a screen printing machine as claimed in claim 1, characterized in that: A transverse track (231) is installed at the outward end of the two front brackets (21), a transverse slide (232) is slidably arranged on the top of the transverse track (231), a longitudinal track (233) is installed between the two transverse slides (232), a longitudinal slide (234) is slidably arranged on the longitudinal track (233), and the tracking sensor (23) is installed on the longitudinal slide (234).

4. A front and rear dual servo device for a screen printing machine as claimed in claim 1, characterized in that: A mounting shaft (24) is rotatably mounted on the upper left of the two front brackets (21); a mounting roller seat (251) is slidably sleeved at both front and rear ends of the mounting shaft (24); and the pressure roller (26) is rotatably mounted on the mounting roller seat (251) via a bearing; A mounting shaft is rotatably mounted on the upper left of the two front brackets (21), and mounting roller seats (261) are fixed at both front and rear ends of the mounting shaft. The pressure roller (26) is rotatably mounted on the two mounting roller seats (261) via bearings.

5. A front and rear dual servo device for a screen printing machine as claimed in claim 4, characterized in that: Two rotatably designed mounting shafts (33) are symmetrically installed at the upper right and lower right sides of the rear conveying roller (32), and mounting roller seats (341) are slidably sleeved at the front and rear ends of the mounting shaft (33), and a pressure wheel (34) is rotatably installed on the mounting roller seat (261) via a bearing.

6. A front and rear dual servo device for a screen printing machine as claimed in claim 5, characterized in that: The rear ends of the mounting shaft 1 (24), the mounting shaft 2 (33) and the mounting rotating shaft are all provided with wrenches, and the mounting roller seat 1 (251), the mounting roller seat 2 (261) and the mounting roller seat 3 (341) are respectively eccentrically arranged on the corresponding mounting shaft 1 (24), the mounting rotating shaft and the mounting shaft 2 (33).

7. A front and rear dual servo device for a screen printing machine as claimed in claim 1, characterized in that: The rear end of the front conveying roller (27) is connected to the output shaft of an external servo motor 1 through a coupling, and the rear end of the rear conveying roller (32) is connected to the output shaft of an external servo motor 2 through a coupling, and the servo motor 1 and the servo motor 2 rotate synchronously.

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