Positioning adjusting mechanism of pad printing equipment
Through the use of electric screw drive and closed-loop stepper motor combined with mechanical micrometer and probe, the problem of low positioning and adjustment accuracy of traditional pad printing equipment is solved, and the effect of fast and efficient positioning and adjustment and absolute centering of the workpiece is achieved, and the printing quality is improved. .
Patent Information
- Application Number
- CN202421194200.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-29
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-29
AI Technical Summary
Traditional pad printing equipment has low accuracy when adjusting the positioning table, long debugging time, and it is difficult to ensure absolute centering of the glass panel, resulting in poor printing quality.
The electric screw drive system and closed-loop stepping positioning motor are adopted to achieve rapid and precise adjustment through mechanical micrometers and compression springs to ensure strict centering of the positioning table and the rubber head, and to ensure absolute centering of the workpiece with probes and electronic micrometers.
Improve the accuracy and efficiency of positioning adjustment, reduce debugging time, and ensure high accuracy and consistency of printed materials.
Smart Images
Figure CN222246546U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of pad printing equipment, in particular to a positioning and adjusting mechanism of pad printing equipment. Background Art
[0002] With the rapid development of electronic devices such as mobile phones and tablets, the requirements for the accuracy and efficiency of supporting production equipment are becoming higher and higher. Among them, the pad printing equipment for printing ink on the frame of its glass panel is one of them. Unlike the pad printing of other products, this type of electronic product has very high requirements for printing accuracy. For example, when printing a frame pattern on a glass panel (printing a black rectangular frame around the edge of the panel), it is necessary to strictly ensure the accuracy of the printing position, otherwise it will cause poor display on the screen. Therefore, on the one hand, it is necessary to adjust the positioning table on which the glass panel to be printed is placed to a position corresponding to the complete center of the transfer rubber head, which requires the positioning table to be adjusted along the three dimensions of the X-axis, Y-axis, and rotation direction; however, in traditional pad printing equipment, the multiple adjustment plates for adjusting the three dimensions are locked and fixed by several bolts arranged around the circumference. When adjusting, they need to be loosened and then locked again after they are adjusted in place. Since the adjustment plate is easy to move after all the bolts are loosened, it is difficult to ensure the movement accuracy, so it is necessary to adjust repeatedly, and repeatedly lock or loosen all the bolts, resulting in a lot of time for debugging before starting production.
[0003] On the other hand, due to the slight size errors between batch-printed glass panels, it is necessary to ensure that the center of each glass panel is consistent with the center of the positioning table in order to achieve consistent printing results. However, traditional pad printing equipment cannot ensure that each glass panel is absolutely centered, so the printing quality can only rely on the stability of the glass panel size. Utility Model Content
[0004] The utility model aims to provide a pad printing equipment positioning adjustment mechanism with high debugging efficiency and high precision.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A positioning and adjustment mechanism for a pad printing device, used for positioning a rectangular workpiece, comprises a base plate, which is fixedly arranged in the horizontal direction; a first adjustment plate, which is installed in parallel to the top surface of the base plate through a Y-axis electric screw drive system to adjust the Y-axis position, a positioning cylinder protruding vertically from the center of the top surface of the first adjustment plate, and at least two vertical first adjustment bolts are installed on the top surface in a centrally symmetrical manner through threads; a second adjustment plate, which is superimposed on the top surface of the first adjustment plate, the center of the second adjustment plate is adaptively penetrated on the positioning cylinder through a circular hole, and the second adjustment plate has a plurality of arc-shaped long holes for each of the first adjustment bolts to pass through and which are concentric with the positioning cylinder, and a first compression spring is also sleeved between the T-head of the first adjustment bolt and the top surface of the second adjustment plate, and at least two vertical second adjustment bolts are installed on the top surface of the second adjustment plate in a centrally symmetrical manner through threads. Adjusting bolt; at least two groups of mechanical micrometers are fixedly installed on one side of the first adjusting plate, and the ends of the measuring rods are against the side of the second adjusting plate; a third adjusting plate is superimposed on the top surface of the second adjusting plate, and the center of the third adjusting plate is provided with a first elongated hole for the positioning cylinder to pass through and extending along the X-axis direction, the width of the first elongated hole is adapted to the diameter of the positioning cylinder, and the third adjusting plate has a plurality of second elongated holes for the second adjusting bolts to pass through and extending along the X-axis direction, and a second compression spring is also sleeved between the T-head of the second adjusting bolt and the top surface of the third adjusting plate; a first threaded seat is installed on one side of the second adjusting plate, and the first threaded seat is threaded with an adjusting screw that can push the third adjusting plate to move along the X-axis direction; and a positioning table, used to place and position the workpiece, is concentrically installed on the third adjusting plate.
[0007] In a preferred embodiment, a plurality of guide posts are vertically protruded from the top surface of the second adjustment plate, and a third elongated hole is correspondingly provided on the third adjustment plate for the guide posts to pass through and extending along the X-axis, and the width of the third elongated hole is adapted to the guide posts.
[0008] In a preferred embodiment, the first adjustment plate, the second adjustment plate, and the third adjustment plate are all roughly rectangular, and the first adjustment bolt and the second adjustment bolt each include four bolts disposed at the four corners of the rectangle and distributed on the concentric circles of the positioning cylinder.
[0009] A preferred solution, the positioning table includes a supporting platform arranged above the third adjustment plate in parallel and at intervals, and the supporting platform is supported and fixed to a plurality of supports on the third adjustment plate; a rectangular positioning groove for placing a workpiece is concentrically provided on the top surface of the supporting platform, and two groups of centering devices along the X-axis and Y-axis directions of the positioning groove are installed between the supporting platform and the third adjustment plate, each group of the centering devices includes at least two first probes vertically arranged on the first side of the positioning groove and distributed on both sides of the midpoint of the side, a closed-loop stepping positioning motor driving the first probe to approach or move away from the first side of the positioning groove, a second probe vertically arranged at the midpoint of the second side opposite to the positioning groove, a mounting block for mounting the second probe, an approach spring forcing the mounting block to approach the second side, a drag motor forcing the mounting block to move away from the second side, and an electronic micrometer for non-contact measurement of the translation distance of the mounting block; the supporting platform has an elongated through groove for the first probe and the second probe to vertically penetrate and translate.
[0010] In a preferred embodiment, the closed-loop stepping positioning motor transmission is installed with a first screw rod, the first probe is installed on the first screw rod through a second threaded seat, and the second threaded seat is slidably installed on the bottom surface of the supporting platform and / or the top surface of the third adjustment plate through a slide rail pair.
[0011] A preferred solution is that the traction motor transmission is installed with a second screw rod, and the second screw rod is installed on a fixed third threaded seat so that the traction motor can move along the length direction of the second screw rod, a vertical first mounting plate is fixed on the traction motor, and a second mounting plate parallel to the first mounting plate is provided at the far end of the second screw rod, the first mounting plate and the second mounting plate are connected and fixed by a plurality of guide columns parallel to the second screw rod, the mounting block is slidably installed on the guide column through a guide sleeve, and the approach spring is installed between the mounting block and the first mounting plate.
[0012] The beneficial effects of the utility model are: 1. When adjusting the position of the positioning platform, the Y-axis position of the first adjusting plate is first adjusted by the electric screw drive system, and then the rotation direction position is adjusted by rotating the second adjusting plate, and the adjustment accuracy is ensured by the two sets of mechanical micrometers, and finally the X-axis position of the third adjusting plate is adjusted by the adjusting screw, so as to achieve strict centering correspondence between the positioning platform and the rubber head; the second adjusting plate is fixed to the first adjusting plate by the first adjusting bolt, and the first adjusting bolt elastically presses the second adjusting plate to the top surface of the first adjusting plate through the first compression spring, so when rotating the second adjusting plate, there is no need to loosen the first adjusting bolts one by one, and there is no need to lock the bolts after the adjustment is completed, so the position adjustment of the second adjusting plate can be completed quickly, and similarly, the adjustment of the third adjusting plate can also be completed quickly, so that while ensuring the adjustment accuracy of the positioning platform, the adjustment efficiency can be greatly improved. 2. During the printing process, after placing the rectangular workpiece in the positioning groove of the positioning table, the first probe is driven by the closed-loop stepping positioning motor to move to the first side reference position set in the X-axis and Y-axis directions of the workpiece, and the drag motor is released at the same time, so that the first probe moves to the other side of the X-axis and Y-axis directions of the workpiece under the thrust of the proximity spring, so that the two opposite sides of the workpiece are in contact with the first probe and the second probe at the same time, and the offset distance between the actual position of the second probe and the second side reference position set for the workpiece is calculated by the electronic micrometer, and then the first probe is translated to half of the offset distance to ensure the absolute centering of the workpiece. Therefore, even if there is a dimensional error in the workpiece, the centering of the printing can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0014] Figure 1 It is a schematic diagram of the overall structure of the positioning adjustment mechanism in the embodiment;
[0015] Figure 2 Schematic diagram of the overall installation structure of each adjustment plate in the embodiment;
[0016] Figure 3 It is a schematic diagram of the partial installation structure of each adjustment plate in the embodiment;
[0017] Figure 4 It is a schematic diagram of the overall installation structure of the positioning platform in the embodiment;
[0018] Figure 5 It is a structural schematic diagram of one side of the first probe of the centering device in the embodiment;
[0019] Figure 6 Schematic diagram of the structure of the second probe side of the centering device in the embodiment. DETAILED DESCRIPTION
[0020] The utility model is further described below in conjunction with the accompanying drawings:
[0021] It should be noted that the words indicating directions in the present application document, such as above, below, top surface, vertical, etc., are only for the convenience of a more intuitive description of the structure in combination with the drawings, and are not intended to limit the product structure.
[0022] refer to Figures 1 to 6 , a positioning and adjustment mechanism of a pad printing device of the present embodiment is used for positioning a rectangular workpiece, comprising a base plate 1, which is fixedly arranged in the horizontal direction; a first adjustment plate 2, which is installed in parallel on the top surface of the base plate 1 through a Y-axis electric screw drive system 21 to adjust the Y-axis position, a positioning cylinder 22 is vertically protruded from the center of the top surface of the first adjustment plate 2, and at least two vertical first adjustment bolts 23 are installed on the top surface in a centrally symmetrical manner; a second adjustment plate 3, which is superimposed on the top surface of the first adjustment plate 2, the center of the second adjustment plate 3 is adaptively penetrated on the positioning cylinder 22 through a circular hole, and the second adjustment plate 3 has a plurality of arc-shaped long holes 31 for each of the first adjustment bolts 23 to pass through and which are concentric with the positioning cylinder 22, and a first compression spring 32 is also sleeved between the T-head of the first adjustment bolt 23 and the top surface of the second adjustment plate 3, and at least two vertical second adjustment bolts are installed on the top surface of the second adjustment plate 3 in a centrally symmetrical manner. bolt 33; at least two groups of mechanical micrometers 34 are fixedly installed on one side of the first adjustment plate 2, and the end of the measuring rod 341 is against the side of the second adjustment plate 3; the third adjustment plate 4 is superimposed on the top surface of the second adjustment plate 3, and the center of the third adjustment plate 4 is provided with a first elongated hole 41 for the positioning cylinder 22 to pass through and extending along the X-axis. The width of the first elongated hole 41 is adapted to the diameter of the positioning cylinder 22, and the third adjustment plate 4 has a plurality of second elongated holes 42 for each second adjusting bolt 33 to pass through and extending along the X-axis. A second compression spring 43 is also sleeved between the T head of the second adjusting bolt 33 and the top surface of the third adjustment plate 4; a first threaded seat 34 is installed on one side of the second adjustment plate 3, and the first threaded seat 34 is threaded with an adjusting screw 44 that can push the third adjustment plate 4 to move along the X-axis; and a positioning table 5, which is used to place and position the workpiece and is concentrically installed on the third adjustment plate 4.
[0023] When adjusting the position of the positioning platform 5, the Y-axis position of the first adjustment plate 2 is first accurately adjusted by the electric screw drive system 21, and then the rotation direction position is adjusted by rotating the second adjustment plate 3. The accuracy of the rotation angle is guaranteed by two sets of mechanical micrometers 34 arranged at intervals, that is, the forward movement distance of one mechanical micrometer 34 is equal to the backward movement distance of the other mechanical micrometer 34. Finally, the X-axis position of the third adjustment plate 4 is adjusted by rotating the relative position of the adjusting screw 44 and the first threaded column, so as to achieve strict centering correspondence between the positioning platform 5 and the rubber head; the second adjustment plate 3 is fixed to the first adjustment plate 2 by a plurality of first adjustment bolts 23, and the first adjustment bolts 23 elastically press the second adjustment plate 3 on the top surface of the first adjustment plate 2 through the first compression spring 32. Therefore, when rotating the second adjustment plate 3, there is no need to loosen the first adjustment bolts 23 one by one, and there is no need to lock the bolts after the adjustment is completed. Therefore, the position adjustment of the second adjustment plate 3 can be completed quickly. Similarly, the adjustment of the third adjustment plate 4 can also be completed quickly. Therefore, while ensuring the adjustment accuracy of the positioning platform 5, the adjustment efficiency can be greatly improved.
[0024] In a preferred embodiment, the top surface of the second adjustment plate 3 of this embodiment further has a plurality of guide posts 35 protruding vertically, and the third adjustment plate 4 is correspondingly provided with a third elongated hole 45 for the guide posts 35 to pass through and extending along the X-axis, and the width of the third elongated hole 45 is adapted to the guide posts 35. In addition to being limited by the positioning cylinder 22, the Y-axis position of the third adjustment plate 4 can also be further limited by a plurality of guide posts 35, thereby ensuring that the third adjustment plate 4 will not be rotated and offset during the adjustment process, and the accuracy can be further improved.
[0025] In a preferred embodiment, the first adjustment plate 2, the second adjustment plate 3, and the third adjustment plate 4 of this embodiment are all roughly rectangular, and the first adjustment bolt 23 and the second adjustment bolt 33 each include four bolts disposed at the four corners of the rectangle and distributed on the concentric circles of the positioning cylinder 22. The first adjustment bolt 23 and the second adjustment bolt 33 disposed at the four corners can ensure uniform distribution of the bonding force between the first adjustment plate 2, the second adjustment plate 3, and the third adjustment plate 4, thereby improving overall stability.
[0026] A preferred solution, the positioning platform 5 of this embodiment includes a supporting platform 51 arranged above the third adjustment plate 4 in parallel and at intervals, and the supporting platform 51 is supported and fixed to a plurality of supports 52 on the third adjustment plate 4; the top surface of the supporting platform 51 is concentrically provided with a rectangular positioning groove 53 for placing the workpiece, and two groups of centering devices 54 along the X-axis and Y-axis directions of the positioning groove 53 are installed between the supporting platform 51 and the third adjustment plate 4, and each group of the centering devices 54 includes at least two first probes 541 vertically arranged on the first side of the positioning groove 53 and distributed on both sides of the midpoint of the side, and the first probes 541 are driven 41 a closed-loop stepping positioning motor 542 for approaching or moving away from a first side of the positioning slot 53, a second probe 543 vertically arranged at the midpoint of a second side opposite to the positioning slot 53, a mounting block 544 for mounting the second probe 543, an approach spring 545 for forcing the mounting block 544 to approach the second side, a dragging motor 546 for forcing the mounting block 544 to move away from the second side, and an electronic micrometer 547 for contactlessly measuring the translation distance of the mounting block 544; the supporting platform 51 has an elongated through slot 511 for the first probe 541 and the second probe 543 to vertically penetrate and translate.
[0027] First, the reference position of each side is set according to the standard size of the rectangular workpiece; at the beginning of each printing cycle, after the workpiece is placed in the positioning groove 53 of the positioning table 5, two sets of closed-loop stepping positioning motors 542 are used to drive two sets of first probes 541 to move to the first side reference positions set in the X-axis and Y-axis directions of the workpiece, and at the same time, the two sets of drag motors 546 are released, that is, the drag motors 546 do not limit the movement of the mounting block 544 toward the workpiece, so that the two sets of first probes 541 only move to the other side of the workpiece in the X-axis and Y-axis directions under the thrust of the approaching spring 545, until the two opposite sides of the workpiece are in contact with the first probe 541 and the second probe 543 at the same time, and the offset distance between the actual position of the second probe 543 and the second side reference position set for the workpiece is calculated by the electronic micrometer 547, and then the first probe 541 is translated by half of the offset distance by the closed-loop stepping positioning motor 542, so that the absolute centering of the workpiece can be guaranteed. Therefore, even if there is a size error in the workpiece, it can be guaranteed that each workpiece is strictly centered during printing, thereby significantly improving the printing accuracy.
[0028] A preferred solution is that the closed-loop stepping positioning motor 542 of this embodiment is driven and installed with a first screw rod 5421, the first probe 541 is installed on the first screw rod 5421 through a second threaded seat 5422, and the second threaded seat 5422 is slidably installed on the bottom surface of the supporting platform 51 and / or the top surface of the third adjustment plate 4 through a slide rail pair 5423. That is, the two first probes 541 move axially along the first screw rod 5421 with the second threaded seat 5422 under the drive of the closed-loop stepping positioning motor 542, and the stability of the movement is ensured by the slide rail pair 5423.
[0029] A preferred solution is that the drag motor 546 of this embodiment is transmission-installed with a second screw rod 5461, and the second screw rod 5461 is penetrated and installed on a fixed third threaded seat 5462, so that the drag motor 546 can move along the length direction of the second screw rod 5461, and a vertical first mounting plate 5463 is fixed on the drag motor 546, and a second mounting plate 5464 parallel to the first mounting plate 5463 is provided at the far end of the second screw rod 5461, the first mounting plate 5463 and the second mounting plate 5464 are connected and fixed by a plurality of guide columns 5465 parallel to the second screw rod 5461, the mounting block 544 is slidably installed on the guide column 5465 through a guide sleeve, and the approach spring 545 is installed between the mounting block 544 and the first mounting plate 5463. During operation, the drag motor 546 drives the second screw rod 5461 to rotate. At this time, the second screw rod 5461 and the drag motor 546 make axial movement relative to the fixed third threaded seat 5462, and the first mounting plate 5463, the guide column 5465 and the second mounting plate 5464 fixedly installed with the drag motor 546 all translate with the drag motor 546; when it is necessary to make the second probe 543 press against the side of the workpiece, the drag motor 546 moves a sufficient distance to one side of the workpiece. At this time, the second mounting plate 5464 does not block the shape of the mounting block 544, and the mounting block 544 approaches the workpiece under the thrust of the approach spring 545. When the second probe 543 is reset to leave the workpiece, the second mounting plate 5464 is driven by the drag motor 546 to move to the side away from the workpiece, thereby dragging the mounting block 544 and the second probe 543 thereon away from the workpiece. In other embodiments, the mounting block 544 can be slidably installed on a slide rail, and the drag motor 546 is fixedly installed with an L-shaped pull rod, and the pull rod is used to pull the mounting block 544 along the slide rail to complete the reset; or the mounting block 544 can be slidably installed on a slide rail, and then the mounting block 544 is pushed to complete the reset by a linear motion mechanism such as a motor or a cylinder to achieve the reset of the mounting block 544.
[0030] The above description does not limit the technical scope of the present invention. Any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A positioning and adjustment mechanism for a pad printing device, used for positioning a rectangular workpiece, characterized in that: It includes a bottom plate, which is fixedly arranged horizontally; A first adjustment plate is installed in parallel to the top surface of the base plate through a Y-axis electric screw drive system to adjust the Y-axis position, a positioning cylinder protrudes vertically from the center of the top surface of the first adjustment plate, and at least two vertical first adjustment bolts are threadedly installed on the top surface in a centrally symmetrical manner; The second adjusting plate is superimposed on the top surface of the first adjusting plate, the center of the second adjusting plate is adaptively penetrated on the positioning cylinder through a circular hole, and the second adjusting plate has a plurality of arc-shaped long holes for each of the first adjusting bolts to pass through and are concentric with the positioning cylinder, and a first compression spring is also sleeved between the T-head of the first adjusting bolt and the top surface of the second adjusting plate, and at least two vertical second adjusting bolts are installed on the top surface of the second adjusting plate in a centrally symmetrical manner with threads; at least two groups of spaced-apart measuring rod ends are also fixedly installed on one side of the first adjusting plate A mechanical micrometer abutted against the side of the second adjustment plate; A third adjustment plate is stacked on the top surface of the second adjustment plate, a first elongated hole is provided in the center of the third adjustment plate for the positioning cylinder to pass through and extending in the X-axis direction, the width of the first elongated hole is adapted to the diameter of the positioning cylinder, the third adjustment plate has a plurality of second elongated holes for the second adjustment bolts to pass through and extending in the X-axis direction, a second compression spring is sleeved between the T-head of the second adjustment bolt and the top surface of the third adjustment plate; a first threaded seat is installed on one side of the second adjustment plate, and an adjustment screw that can push the third adjustment plate to move in the X-axis direction is threadedly matched on the first threaded seat; And a positioning table, used for placing and positioning the workpiece, is concentrically mounted on the third adjustment plate.
2. The positioning adjustment mechanism of a pad printing device according to claim 1, characterized in that: The top surface of the second adjustment plate is also vertically protruded with a plurality of guide posts, and the third adjustment plate is correspondingly provided with a third elongated hole for the guide posts to pass through and extending along the X-axis direction, and the width of the third elongated hole is adapted to the guide posts.
3. The positioning adjustment mechanism of a pad printing device according to claim 1, characterized in that: The first adjustment plate, the second adjustment plate, and the third adjustment plate are all roughly rectangular, and the first adjustment bolt and the second adjustment bolt each include four bolts which are respectively arranged at the four corners of the rectangle and distributed on the concentric circles of the positioning cylinder.
4. The positioning adjustment mechanism of a pad printing device according to claim 1, characterized in that: The positioning platform includes a supporting platform arranged above the third adjustment plate in parallel and at intervals, and the supporting platform is supported and fixed to a plurality of supports on the third adjustment plate; a rectangular positioning groove for placing a workpiece is concentrically provided on the top surface of the supporting platform, and two sets of centering devices along the X-axis and Y-axis directions of the positioning groove are installed between the supporting platform and the third adjustment plate, each set of the centering devices includes at least two first probes vertically arranged on the first side of the positioning groove and distributed on both sides of the midpoint of the side, a closed-loop stepping positioning motor driving the first probe to approach or move away from the first side of the positioning groove, a second probe vertically arranged at the midpoint of the second side opposite to the positioning groove, a mounting block for mounting the second probe, an approach spring for forcing the mounting block to approach the second side, a drag motor for forcing the mounting block to move away from the second side, and an electronic micrometer for non-contact measurement of the translation distance of the mounting block; the supporting platform is provided with an elongated through groove for the first probe and the second probe to vertically penetrate and translate.
5. The positioning adjustment mechanism of a pad printing device according to claim 4, characterized in that: The closed-loop stepping positioning motor is driven and installed with a first screw rod, the first probe is installed on the first screw rod through a second threaded seat, and the second threaded seat is slidably installed on the bottom surface of the supporting platform and / or the top surface of the third adjustment plate through a slide rail pair.
6. The positioning adjustment mechanism of a pad printing device according to claim 4, characterized in that: The traction motor transmission is installed with a second screw rod, and the second screw rod is installed on a fixed third threaded seat so that the traction motor can move along the length direction of the second screw rod. A vertical first mounting plate is fixed on the traction motor, and a second mounting plate parallel to the first mounting plate is provided at the far end of the second screw rod. The first mounting plate and the second mounting plate are connected and fixed by a plurality of guide columns parallel to the second screw rod. The mounting block is slidably installed on the guide column through a guide sleeve, and the approach spring is installed between the mounting block and the first mounting plate.