Paper pressing device and digital printer

Abstract

The embodiment of the present invention provides a paper pressing device and a digital printer, the device comprising: a limiting pressure strip respectively assembled on both sides of the printing substrate conveying path of the digital printer by means of a support member and suspended above the edge of the bearing platform on both sides in the printing substrate conveying path in parallel with the printing substrate conveying path, and a gap adjustment component arranged between the support member and the limiting pressure strip for adjusting the height of the paper pressing gap formed between the limiting pressure strip and the bearing surface of the bearing platform to match the thickness of a single printing substrate, the gap adjustment component comprising a connecting frame fixed on the support member and provided with a first perforation, a fixing block fixed on the limiting pressure strip and provided with a first screw hole, and an adjustment bolt with a threaded end passing through the first perforation and then screwed into the first screw hole, the axial direction of the adjustment bolt being perpendicular to the bearing surface. This embodiment can effectively make the warped edge of the printing substrate fit smoothly on the bearing platform.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of digital printers, and in particular to a paper pressing device and a digital printer. Background Art

[0002] Printing substrates (such as cardboard) usually form warping edges during movement and transportation. When the printing substrate with warping edges is supplied to a digital printer for printing, the warping edges usually interfere with the printer, resulting in relatively poor printing effects, and in severe cases even damaging the printer.

[0003] In order to improve the printing effect of printing substrates with warped edges, an existing digital printer usually uses a suction platform to carry the printing substrate, and the suction platform forms a negative pressure between the printing substrate and the suction platform to adsorb and adhere the printing substrate to the bearing surface of the suction platform, and the warped edge of the printing substrate can also be flatly adsorbed and adhered to the bearing surface of the suction platform. However, since it is also necessary to take into account the continuous forward conveyance of the printing substrate along the bearing surface of the suction platform, the negative pressure formed by the suction platform cannot be too large, otherwise the printing substrate cannot be smoothly conveyed forward, and when a relatively small negative pressure is set, the adsorption effect is also poor for some printing substrates with relatively large hardness or large warping of the edge. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present invention is to provide a paper pressing device for a digital printer, which can effectively make the warped edge of the printing substrate fit evenly on the carrying platform.

[0005] A further technical problem to be solved by the embodiments of the present invention is to provide a digital printer that can effectively ensure the implementation of printing on a printing substrate with warped edges.

[0006] In order to solve the above technical problems, an embodiment of the present invention first provides the following technical solutions: a paper pressing device of a digital printer, comprising: a limiting pressure strip which is respectively assembled on both sides of a printing substrate conveying path of the digital printer by means of a supporting member and suspended above the edge parts of a carrying platform on both sides of the printing substrate conveying path in parallel with the printing substrate conveying path, and a gap adjustment component which is arranged between the supporting member and the limiting pressure strip and is used to adjust the height of the paper pressing gap formed between the limiting pressure strip and the carrying surface of the carrying platform to match the thickness of a single printing substrate, the gap adjustment component comprising a connecting frame fixed to the supporting member and provided with a first through-hole, a fixing block fixed to the limiting pressure strip and provided with a first screw hole, and an adjusting bolt which passes a threaded end through the first through-hole and is screwed into the first screw hole, the axial direction of the adjusting bolt is perpendicular to the carrying surface.

[0007] Furthermore, one end of the limiting pressure strip located at the feeding end of the paper pressing gap is obliquely bent in a direction away from the bearing platform to form a guiding portion having a predetermined acute angle with the bearing surface.

[0008] Furthermore, the two ends of the limiting pressure strip are respectively assembled on the support member by means of a gap adjustment component.

[0009] Furthermore, the device is provided with a plurality of limiting pressure bars, which are divided into two groups. One group of limiting pressure bars is provided on opposite sides of the printing substrate conveying path, and each limiting pressure bar in the same group is arranged in a row in sequence along the printing substrate conveying path.

[0010] Furthermore, the support member is a beam perpendicular to the printing substrate conveying path and suspended above the supporting platform, the beam is provided with a shrinking groove extending along the length direction of the beam, the connecting frame is provided with a sliding block, and the connecting frame is slidably arranged in the shrinking groove through the sliding block.

[0011] Furthermore, the device is provided with a plurality of mutually parallel limiting pressure strips, and the opposite ends of each of the limiting pressure strips are respectively assembled on the corresponding crossbeam through one of the gap adjustment components.

[0012] Furthermore, the connecting frame is provided with a second through hole, the sliding block is provided with a second screw hole, and a locking bolt passes through the second through hole and is screwed into the second screw hole. The head of the locking bolt cooperates with the sliding block to clamp and position the connecting frame and the beam.

[0013] Furthermore, the connecting frame includes a vertical plate vertically arranged with respect to the bearing surface and a horizontal plate vertically connected with the vertical plate, the vertical plate is fixedly connected with the horizontal beam, and the first through hole and the second through hole are respectively arranged on the horizontal plate and the vertical plate.

[0014] On the other hand, in order to solve the above-mentioned further technical problems, an embodiment of the present invention further provides the following technical solution: a digital printer, comprising a carrying platform for carrying a printing substrate and a paper pressing device fixedly assembled above the carrying platform, wherein the paper pressing device is a paper pressing device as described in any one of the above items.

[0015] Furthermore, the bearing platform is an air suction platform.

[0016] After adopting the above technical scheme, the embodiment of the present invention has at least the following beneficial effects: the embodiment of the present invention assembles a limiting pressure strip above the carrying platform with the help of a support member, and the limiting pressure strip is arranged at the edge portions of the carrying platform on both sides in the printing substrate conveying path, and a paper pressing gap is formed by the limiting pressure strip and the bearing surface of the carrying platform, and the gap adjustment component is adjusted so that the height of the paper pressing gap is only sufficient for a single printing substrate to pass through, and when a printing substrate with a warped edge enters the paper pressing gap, the warped edge can be effectively pressed against the bearing surface by the limiting pressure strip, thereby ensuring the printing effect of the digital printer, and when it is specifically necessary to adjust the height of the paper pressing gap, the adjusting bolt can be screwed to change the axial length of the fixing block that the adjusting bolt is screwed into and fixed on the limiting pressure strip, so that the limiting pressure strip can be simply raised or lowered relative to the bearing surface, thereby adjusting the height of the paper pressing gap, so that the paper pressing device of the present invention can be compatible with printing substrates of different thicknesses. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the structure of the disassembled state of an optional embodiment of the paper pressing device of the digital printer of the present invention.

[0018] Figure 2 The figure is a schematic diagram of the structure of the combined state of an optional embodiment of the paper pressing device of the digital printer of the present invention.

[0019] Figure 3 The figure is a schematic diagram of the structure of the combined state of another optional embodiment of the paper pressing device of the digital printer of the present invention.

[0020] Figure 4 The present invention is a partial cross-sectional structural schematic diagram of an optional embodiment of the paper pressing device of the digital printer of the present invention along the central axis of the adjusting bolt.

[0021] Figure 5 This is a schematic diagram of the lateral structure of an optional embodiment of the paper pressing device of the digital printer of the present invention, showing a printing substrate with a warped edge before entering the paper pressing gap.

[0022] Figure 6 This is a schematic diagram of the lateral structure of an optional embodiment of the paper pressing device of the digital printer of the present invention, showing a printing substrate with a warped edge entering the paper pressing gap. DETAILED DESCRIPTION

[0023] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. In addition, the embodiments and features in the embodiments of the present application may be combined with each other without conflict.

[0024] like Figure 1-Figure 6As shown, an optional embodiment of the present invention provides a paper pressing device 1 of a digital printer, comprising: a limiting pressure strip 12 respectively assembled on both sides of a printing substrate 3 conveying path of the digital printer by means of a support member 10 and suspended above the edge portions of a carrying platform 5 on both sides of the printing substrate 3 conveying path in parallel with the printing substrate 3 conveying path, and a gap adjustment component 14 arranged between the support member 10 and the limiting pressure strip 12 for adjusting the height of a paper pressing gap A formed between the limiting pressure strip 12 and a bearing surface of the carrying platform 3 to match the thickness of a single printing substrate 3, the gap adjustment component 14 comprising a connecting frame 141 fixed on the support member 10 and provided with a first through hole 141a, a fixing block 143 fixed on the limiting pressure strip 12 and provided with a first screw hole 143a, and an adjusting bolt 145 with a threaded end passing through the first through hole 141a and then screwed into the first screw hole 143a, the axial direction of the adjusting bolt 145 being perpendicular to the bearing surface.

[0025] The embodiment of the present invention assembles a limiting pressure strip 12 above the carrying platform 5 with the help of a support member 10, and the limiting pressure strip 12 is arranged at the edge portions of the carrying platform 5 on both sides in the conveying path of the printing substrate 3, and a paper pressing gap A is formed by the limiting pressure strip 12 and the bearing surface of the carrying platform 3. By adjusting the gap adjustment component 14, the height of the paper pressing gap A is only sufficient for a single printing substrate 3 to pass through. When the printing substrate 3 with a warped edge 30 enters the paper pressing gap A, the warped edge 30 can be effectively pressed and adhered to the bearing surface by the limiting pressure strip 10, thereby ensuring the printing effect of the digital printer. When it is specifically necessary to adjust the height of the paper pressing gap A, by screwing the adjusting bolt 145 and changing the axial length of the fixing block 143 screwed into the adjusting bolt 145 and fixed on the limiting pressure strip 12, the limiting pressure strip 10 can be simply raised or lowered relative to the bearing surface, thereby adjusting the height of the paper pressing gap A, so that the paper pressing device 1 of the present invention can be compatible with printing substrates 3 of different thicknesses.

[0026] In an optional embodiment of the present invention, Figure 1 As shown, one end of the limit pressure strip 12 located at the feeding end of the paper pressing gap A is bent obliquely toward the direction away from the bearing platform 3 to form a guide portion 121 having a predetermined acute angle with the bearing surface. In this embodiment, by providing the guide portion 121, the printing substrate 3 is effectively guided to enter the paper pressing gap A, and the warped edge 30 of the printing substrate 3 can be gradually pressed down as the printing substrate 3 moves. Figure 1 In the embodiment, the guide portion 121 is an arc-shaped projection that bends upwardly toward the bearing surface; of course, it may also be a seesaw that extends obliquely upwardly toward the bearing surface.

[0027] In another optional embodiment of the present invention, the two ends of the limiting pressure strip 12 are respectively assembled on the support member 10 by means of a gap adjustment component 14. In this embodiment, by respectively assembling the two ends of the limiting pressure strip 12 on the support member 10 by using the gap adjustment components 14, and by respectively adjusting the gap adjustment components 14 at the two ends, the adjustment accuracy of the paper pressing gap A is higher and the adjustment is more convenient.

[0028] In an optional embodiment of the present invention, Figure 2 As shown, the device is provided with a plurality of limiting pressure strips 12, and the limiting pressure strips 12 are divided into two groups, one group of limiting pressure strips 12 is provided on opposite sides of the conveying path of the printing substrate 3, and the limiting pressure strips 12 in the same group are sequentially arranged in a row along the conveying path of the printing substrate 3. In this embodiment, when the length of the printing substrate 3 is relatively long and the length of a single limiting pressure strip 12 is insufficient to meet the pressure on the printing substrate 3, by providing one group of limiting pressure strips 12 on opposite sides of the conveying path of the printing substrate 3, and the limiting pressure strips 12 in the same group are sequentially arranged in a row along the conveying path of the printing substrate 3, the long printing substrate 3 can be effectively limited by the pressure.

[0029] In another optional embodiment of the present invention, Figure 1 As shown, the support member 10 is a beam perpendicular to the conveying path of the printing substrate 3 and suspended above the carrying platform 5. The beam 10 is provided with a shrinking chute 101 extending along the length direction of the beam 10. The connecting frame 141 is provided with a sliding block 103. The connecting frame 141 is correspondingly slidably arranged in the shrinking chute 101 through the sliding block 103. In this embodiment, the support member 10 adopts a beam, which can effectively realize the support and positioning of the limiting pressure strip 10; by providing the shrinking chute 101 on the beam 10, and the connecting frame 141 is correspondingly slidably arranged in the shrinking chute 101 through the sliding block 103, the limiting pressure strip 12 can slide along the length direction of the beam 10 to adapt to printing substrates 3 of different widths. In specific implementation, it can be understood that the shrinking chute 101 specifically refers to a chute whose slot width is smaller than the slot width.

[0030] In another optional embodiment of the present invention, Figure 3 As shown, the device is provided with a plurality of mutually parallel limiting pressure strips 12, and the opposite ends of each of the limiting pressure strips 12 are respectively assembled on the corresponding cross beam 10 through a gap adjustment component 14. In this embodiment, in view of the situation that the carrying platform 5 carries multiple printing substrates 3 at the same time, by using a plurality of limiting pressure strips 12, the opposite ends of each limiting pressure strip 12 are respectively assembled on the corresponding cross beam 10 through a gap adjustment component 14, and the pressing and limiting of multiple printing substrates 3 can be achieved at the same time.

[0031] In another optional embodiment of the present invention, Figure 1 and Figure 4 As shown, the connecting frame 141 is provided with a second through hole 141b, the sliding block 103 is provided with a second screw hole 105, and a locking bolt 141c passes through the second through hole 141b and is screwed into the second screw hole 105, and the head of the locking bolt 141c cooperates with the sliding block 103 to clamp and position the connecting frame 141 and the beam 10. In this embodiment, the locking bolt 141c passes through the second through hole 141b and is screwed into the second screw hole 105. On the one hand, the connection and assembly between the connecting frame 141 and the sliding block 103 can be realized. On the other hand, by respectively rotating the locking bolt 141c in different clockwise directions, the head of the locking bolt 141c and the sliding block 103 can be moved relative to each other, thereby realizing the positioning and loosening of the connecting frame 141 and the beam 10. When the connecting frame 141 and the beam 10 are relatively loosened, the connecting frame 141 can drive the limiting pressure strip 12 to slide along the length direction of the beam 10 to realize position adjustment. After the adjustment is in place, the locking bolt 141c is screwed in the reverse direction to relative position the connecting frame 141 and the beam 10. The assembly structure is simple and the operation is convenient.

[0032] In another optional embodiment of the present invention, Figure 4 As shown, the connecting frame 141 includes a vertical plate 1410 vertically arranged with the bearing surface and a horizontal plate 1412 vertically connected with the vertical plate 1410, the vertical plate 1410 is fixedly connected with the crossbeam 10, and the first through hole 141a and the second through hole 141b are respectively arranged on the horizontal plate 1412 and the vertical plate 1410. In this embodiment, the connecting frame 141 adopts the horizontal plate 1412 and the vertical plate 1410, and the first through hole 141a and the second through hole 141b are respectively arranged on the horizontal plate 1412 and the vertical plate 1410, and the overall assembly structure is simpler and more convenient.

[0033] In a specific implementation, the limiting pressure strip 12 is a metal belt (for example, a steel belt) with a predetermined toughness. The metal belt can also stably and effectively press and limit the printing substrate 3 (for example, cardboard) with a certain hardness to prevent the limiting pressure strip 12 from being easily deformed by force.

[0034] On the other hand, Figure 1As shown, an embodiment of the present invention provides a digital printer, including a carrying platform 5 for carrying a printing substrate 3 and a paper pressing device 1 fixedly assembled on the carrying platform 5, wherein the paper pressing device 1 is a paper pressing device as described in any of the above items. The digital printer of this embodiment adopts the paper pressing device 1 as described above, which can effectively press the warped edge 30 of the printing substrate 3 flatly on the carrying platform to ensure the printing effect. In a specific implementation, the crossbeam 10 of the paper pressing device 1 can be assembled on the carrying platform 1 by being relatively fixed to the supporting fixed structure of the digital printer, such as: the frame of the digital printer, etc.

[0035] In another optional embodiment of the present invention, the carrying platform 5 is a suction platform. In this embodiment, the carrying platform 5 is a suction platform, and suction is also performed on the bottom of the printing substrate 3 to generate negative pressure at the bottom of the printing substrate 3, thereby adsorbing the printing substrate 3 on the carrying surface, thereby improving the positioning effect of the warped edge 30 of the printing substrate 3.

[0036] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, which all belong to the protection scope of the present invention.

Claims

1. A paper pressing device for a digital printer, characterized in that: The device comprises: a limiting pressure strip respectively assembled on both sides of the printing substrate conveying path of the digital printer by means of a supporting member and suspended above the edge of the bearing platform on both sides in the printing substrate conveying path in parallel with the printing substrate conveying path, and a gap adjustment component arranged between the supporting member and the limiting pressure strip for adjusting the height of the paper pressing gap formed between the limiting pressure strip and the bearing surface of the bearing platform to match the thickness of a single printing substrate, the limiting pressure strip is a metal belt with a predetermined toughness, the gap adjustment component comprises a connecting frame fixed on the supporting member and provided with a first perforation, a fixing block fixed on the limiting pressure strip and provided with a first screw hole, and an adjusting bolt with a threaded end passing through the first perforation and then screwed into the first screw hole, the axial direction of the adjusting bolt is perpendicular to the bearing surface; the supporting member is a beam perpendicular to the printing substrate conveying path and suspended above the bearing platform, the beam is provided with a shrinking slot extending along the length direction of the beam, the connecting frame is provided with a sliding block, and the connecting frame is correspondingly slidably arranged in the shrinking slot through the sliding block.

2. The paper pressing device of a digital printer according to claim 1, characterized in that: One end of the limiting pressure strip located at the feeding end of the paper pressing gap is bent obliquely toward a direction away from the bearing platform to form a guiding portion having a predetermined acute angle with the bearing surface.

3. The paper pressing device of a digital printer according to claim 1, characterized in that: The two ends of the limit pressure strip are respectively assembled on the support member by means of a gap adjustment component.

4. The paper pressing device of a digital printer according to claim 1, characterized in that: The device is provided with a plurality of limiting pressure strips, which are divided into two groups. One group of limiting pressure strips is provided on opposite sides of the printing substrate conveying path, and each limiting pressure strip in the same group is arranged in a row in sequence along the printing substrate conveying path.

5. The paper pressing device of a digital printer according to claim 1, characterized in that: The device is provided with a plurality of mutually parallel limiting pressure strips, and the opposite ends of each of the limiting pressure strips are respectively assembled on the corresponding crossbeam through one of the gap adjustment components.

6. The paper pressing device of a digital printer according to claim 1, characterized in that: The connecting frame is provided with a second through hole, the sliding block is provided with a second screw hole, and a locking bolt passes through the second through hole and is screwed into the second screw hole. The head of the locking bolt cooperates with the sliding block to clamp and position the connecting frame and the crossbeam.

7. The paper pressing device of a digital printer according to claim 6, characterized in that: The connecting frame includes a vertical plate vertically arranged with respect to the bearing surface and a horizontal plate vertically connected with the vertical plate, the vertical plate is fixedly connected with the horizontal beam, and the first through hole and the second through hole are respectively arranged on the horizontal plate and the vertical plate.

8. A digital printer, comprising a carrying platform for carrying a printing substrate and a paper pressing device fixedly assembled above the carrying platform, characterized in that: The paper pressing device is the paper pressing device as described in any one of claims 1 to 7.

9. The digital printer according to claim 8, characterized in that: The bearing platform is an air suction platform.

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