A belt-type digital printing machine and a media flattening method

Abstract

This invention relates to the field of digital printing technology, specifically disclosing a belt-type digital printing machine and a media flattening method. The belt-type digital printing machine includes at least a frame, a drive roller, a driven roller, a guide belt, and a media flattening mechanism. The media flattening mechanism includes at least a rotary mechanism, a spreading roller, and a rotary drive mechanism. The rotary drive mechanism is fixedly connected to one end of the driven roller's spindle and drives the driven roller's spindle to rotate bidirectionally. This structure, through the synchronous rotary motion of the spreading roller and the driven roller's spindle, effectively flattens wrinkles on the printing media, changing the traditional horizontal movement of flattening devices. The design is ingenious, the structure is simple, and the mechanism control is simpler and more stable. It effectively utilizes the outer circumferential surface of the driven roller as the working surface for flattening the printing media, requiring a shorter guide belt length and a smaller distance between the driven roller and the drive roller, resulting in a smaller printing machine size, less space required, and lower equipment cost.

Description

Technical Field

[0001] This invention relates to the field of digital printing technology, specifically to a belt-type digital printing machine and a media flattening method. Background Technology

[0002] A belt-type digital printing machine uses a flattening device to flatten the media and attach it to the guide belt. The media moves with the guide belt to the printing position at the front of the printing machine, and then the print head prints the image onto the media.

[0003] Current media flattening devices either involve a spreading roller moving horizontally on a guide belt to adhere the media, or a spreading roller moving downwards to press the media and then dragging the fabric along the guide belt. However, the method of moving the media vertically to press it and then dragging the fabric along the guide belt is not very effective at flattening wrinkles and is therefore less commonly used.

[0004] Among these, horizontally moving media flattening devices are widely used. For example, Chinese utility model patent CN217996238U discloses a media flattening device for a belt-type digital printing machine, and Chinese invention patent CN103612486A discloses a printing machine and its media flattening method; both employ this horizontally moving media flattening method. In these devices, the spreading roller (flattening roller) is equipped with a translation mechanism, which can achieve media flattening by reciprocating above the guide belt.

[0005] While this horizontally moving media flattening method achieves good flattening results, its drawback lies in the fact that the guide belt is relatively long due to the translation mechanism, which further increases the size of the printing machine, requires more space, and raises equipment costs. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a structurally improved guide belt digital printing machine and a flattening method to solve the technical defects of the traditional horizontal moving media flattening method, which results in a long guide belt, large printing machine size, large space requirement and high equipment cost.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a belt-type digital printing machine, comprising at least a frame, a drive roller, a driven roller, a guide belt surrounding the drive roller and the driven roller, and a media flattening mechanism, wherein the driven roller is provided with a driven roller spindle, the driven roller spindle is rotatably connected to the driven roller, and the driven roller spindle is rotatably connected to the frame;

[0008] The media flattening mechanism includes at least:

[0009] A rotary mechanism, a pair of rotary mechanisms are symmetrically installed on both sides of the driven roller along the axial direction, and the rotary mechanism is fixedly connected to the driven roller spindle;

[0010] A spreading roller is located between a pair of rotary mechanisms, with both ends of the spreading roller being rotatably connected to the rotary mechanisms respectively. The spreading roller has a first state located above the driven roller and a second state located on the side of the driven roller away from the driving roller.

[0011] A rotary drive mechanism is fixedly connected to one end of the driven roller spindle and is used to drive the driven roller spindle to rotate bidirectionally. The driven roller spindle drives the spreading roller to reciprocate between a first state and a second state.

[0012] In a preferred embodiment, the rotary mechanism includes at least a support base, a sliding base, and a displacement drive mechanism for driving the sliding base to move linearly relative to the support base. The support base is fixedly connected to the driven roller spindle, and both ends of the spreading roller are rotatably connected to the sliding base.

[0013] In a preferred embodiment, a guide shaft is provided at one end of the support base away from the driven roller spindle, and the sliding base is axially movably connected to the guide shaft.

[0014] In a preferred embodiment, the sliding seat is provided with a linear bearing or guide hole adapted to the guide shaft.

[0015] In a preferred embodiment, a fixed base plate is provided at the end of the guide shaft away from the support seat, and the displacement driving mechanism is a cylinder mounted on the fixed base plate, with the piston rod end of the cylinder fixedly connected to the sliding seat.

[0016] In a preferred embodiment, the rotary drive mechanism includes a worm gear reducer and a drive motor, wherein the input end of the worm gear reducer is connected to the drive motor, and the output end of the worm gear reducer is connected to the driven roller spindle.

[0017] In a preferred embodiment, the system further includes a displacement adjusting mechanism for adjusting the relative displacement between the driven roller and the driving roller. Two sets of the displacement adjusting mechanism are symmetrically mounted on both axial sides of the driven roller. The displacement adjusting mechanism includes at least:

[0018] A slide rail, which is fixedly mounted on the frame;

[0019] An adjusting seat is slidably connected to the slide rail, and the driven roller spindle is rotatably connected to the adjusting seat;

[0020] An adjustment drive mechanism is provided on the side of the driven roller close to the driving roller and is used to drive the adjustment seat to move along the slide rail.

[0021] In a preferred embodiment, the adjustment drive mechanism includes an adjustment bolt and a bolt seat that is helically engaged with the adjustment bolt. The bolt seat is fixedly mounted on the frame, and one end of the adjustment bolt is fixedly connected to the adjustment seat.

[0022] This embodiment also provides a media flattening method for the aforementioned belt-type digital printing machine. A preferred embodiment includes at least the following steps:

[0023] Step A describes a rotary drive mechanism that drives the spreader roller to a first state located above the driven roller, allowing the printing medium to pass through the gap between the spreader roller and the guide belt from the side away from the drive roller.

[0024] Step B describes a rotary drive mechanism that drives the spreading roller to rotate from the first state to the second state, and uses rolling pressure to adhere the printing medium to the guide belt.

[0025] Step C: The active roller drives the guide belt to move. During the movement of the active roller, the rotary drive mechanism drives the spreading roller to rotate from the second state to the first state and then stops. The active roller stops moving when the printing medium on the guide belt is in the printing position.

[0026] During step D of the printing process, the rotary drive mechanism drives the spreading roller to rotate from the first state to the second state, and the printing medium is adhered to the guide belt by rolling and pressing.

[0027] Repeat steps C and D above until printing is complete.

[0028] In a preferred embodiment, step A includes:

[0029] In step A01, the rotary drive mechanism drives the spreading roller to move to the first state above the driven roller;

[0030] The displacement driving mechanism described in step A02 drives the spreading roller to rise, thereby increasing the gap between the spreading roller and the guide belt;

[0031] Step A03: Pass the printing media through the gap between the spreader roller and the guide belt from the side away from the drive roller;

[0032] The displacement driving mechanism described in step A04 drives the spreading roller to descend, causing the spreading roller to press against the printing medium.

[0033] Compared with the prior art, the belt-type digital printing machine and media flattening method of this embodiment have the following advantages:

[0034] (1) Based on the setting of the rotary mechanism, the wrinkles of the printing medium can be effectively flattened by the synchronous rotary motion of the spreading roller and the driven roller core shaft. This changes the traditional horizontal movement working mode of the flattening device. The design concept is ingenious, the structure is simple, and the mechanism control is simpler and more stable.

[0035] (2) The outer circumferential surface of the driven roller is effectively used as the working surface for flattening the printing medium. Compared with the traditional horizontal moving flattening device, the required guide belt length is shorter and the distance between the driven roller and the driving roller is smaller, which makes the printing machine smaller in size, requires less space, and has lower equipment cost.

[0036] (3) The adjustment drive mechanism for adjusting the distance between the driven roller and the driving roller is set on the side of the driven roller close to the driving roller, which effectively utilizes the space between the driving roller and the driven roller, resulting in a shorter length, a more compact structure, and a smaller space occupation for the belt-type digital printing machine. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the structure of the belt-type digital printing machine in this embodiment;

[0038] Figure 2 This is a partial structural diagram showing the location of the driven roller and the spreading roller in the belt-type digital printing machine of this embodiment;

[0039] Figure 3 This is a partial cross-sectional view of the location of the driven roller and the spreading roller in the belt-type digital printing machine of this embodiment;

[0040] Figure 4 This is a schematic diagram of the fabric spreading roller in the second state of the conveyor belt digital printing machine in this embodiment;

[0041] Figure 5 This is a partial structural diagram of the displacement adjustment mechanism in the belt-type digital printing machine of this embodiment. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0043] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to the internal connection of two components; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] like Figure 1 As shown, this embodiment of a belt-type digital printing machine includes a frame 10, a drive roller 13, a driven roller 14, a guide belt 15 surrounding the drive roller 13 and the driven roller 14, a crossbeam 11 located above the guide belt, a printing carriage 12 moving along the crossbeam 11, a feed roll 18, and a fabric winding mechanism located between the feed roll 18 and the driven roller 14. The printing medium 17 reaches the position of the driven roller from the feed roll 18 via the fabric winding mechanism. It should be noted that the above structure is a common structure of existing belt-type digital printing machines and will not be described in detail here.

[0046] As a special feature of this embodiment, such as Figure 3 As shown, the driven roller 14 is provided with a driven roller spindle 141, which is rotatably connected to the driven roller 14 via a first bearing 142, and is rotatably connected to the adjusting seat 41 on the frame 10 via a second bearing 143. In traditional belt-type digital printing machines, the driven roller 14 and the driven roller spindle 141 are an integral structure.

[0047] In this embodiment, a media flattening mechanism is also provided. For example... Figures 1-3 As shown, the media flattening mechanism includes a rotary mechanism 20, a spreading roller 16, and a rotary drive mechanism. The rotary drive mechanism includes a worm gear reducer 30 and a drive motor (not shown in the figure). The input end of the worm gear reducer 30 is connected to the drive motor, and the output end is connected to the driven roller spindle 141.

[0048] As a special feature of this embodiment, a pair of rotary mechanisms 20 are provided and symmetrically installed on both sides of the driven roller 14. In this embodiment, the rotary mechanism 20 includes a support base 21, a sliding base 22, and a displacement driving mechanism, which is used to drive the sliding base 22 to move linearly relative to the support base 21.

[0049] In this embodiment, the support seat 21 is fixedly connected to the driven roller core 141 through the expansion sleeve 27, and the spreading roller 16 is located between a pair of rotating mechanisms 20, with its two ends respectively rotatably connected to the sliding seat 22 through the third bearing 161.

[0050] In this embodiment, a preferred displacement driving mechanism is a cylinder 25. Two guide shafts 23 are provided on the support base 21 at the end away from the driven roller spindle 141. A fixed base plate 24 is provided at the end of the guide shafts 23 away from the support base 21. The cylinder 25 is fixedly connected to the fixed base plate 24, and the end of the piston rod 251 of the cylinder 25 is fixedly connected to the sliding seat 22.

[0051] In this embodiment, preferably, the sliding seat 22 is axially movably connected to the guide shaft 23. Accordingly, the sliding seat 22 is provided with a linear bearing or guide hole adapted to the guide shaft 23. In this embodiment, the sliding seat 22 is provided with a linear bearing 26.

[0052] In this embodiment, the media flattening mechanism can drive the driven roller spindle 141 to rotate bidirectionally via a rotary drive mechanism, thereby causing the rotary mechanism 20 to swing in sync with the driven roller spindle 141. The spreading roller 16 located between the rotary mechanisms 20 has... Figures 1-3 The first state shown is located above the driven roller 14, and as shown in the figure. Figure 4 In the second state shown, located on the side of the driven roller away from the driving roller, the spreading roller 16 can reciprocate between the first state and the second state under the driving force of the rotary drive mechanism. During the rotary movement from the first state to the second state, the printing medium 17 is adhered to the guide belt 15 by rolling and pressing.

[0053] In this embodiment, a displacement adjustment mechanism is also included for adjusting the relative displacement between the driven roller 14 and the driving roller 13. The displacement adjustment mechanism is provided in two sets and is symmetrically installed on both sides of the driven roller 14.

[0054] like Figure 2 , Figure 3 as well as Figure 5 As shown, the displacement adjustment mechanism of this embodiment includes a pair of slide rails 40 arranged parallel to each other on the frame 10, an adjustment seat 41 slidably connected to the slide rails 40, and an adjustment drive mechanism for driving the adjustment seat to move along the slide rails 40. The driven roller spindle 141 is rotatably connected to the adjustment seat 41 via a second bearing 143.

[0055] A unique feature of this embodiment is that the adjustment drive mechanism is located on the side of the driven roller 14 closest to the driving roller 13. In conventional belt-type digital printing machines, the displacement adjustment structure used to adjust the displacement of the driven roller relative to the driving roller is usually located on the side of the driven roller furthest from the driving roller. In this embodiment, by placing the adjustment drive mechanism on the side of the driven roller 14 closest to the driving roller 13, the space between the driving roller and the driven roller is effectively utilized, resulting in a shorter length, a more compact structure, and a smaller footprint for the belt-type digital printing machine.

[0056] As a preferred option, such as Figure 5 As shown, the adjustment drive mechanism in this embodiment includes an adjustment bolt 43 and a bolt seat 42 that is screwed into the adjustment bolt 43. The bolt seat 42 is fixedly mounted on the frame 10, and one end of the adjustment bolt 43 is fixedly connected to the adjustment seat 41 via a fixing structure 44. In this embodiment, by rotating the adjustment bolt, the relative displacement between the driven roller and the driving roller can be adjusted, thereby adjusting the tension of the guide belt.

[0057] The media flattening method of the belt-type digital printing machine in this embodiment includes the following steps:

[0058] Step A describes a rotary drive mechanism that drives the spreading roller to move to... Figure 1 The first state, shown above the driven roller, involves the printing media passing through the gap between the spreader roller and the guide belt from the side away from the driving roller. Step A further includes the following steps: Step A01, the rotary drive mechanism drives the spreader roller to move to the first state above the driven roller; Step A02, the displacement drive mechanism drives the spreader roller to rise, increasing the gap between the spreader roller and the guide belt; Step A03, the printing media passes through the gap between the spreader roller and the guide belt from the side away from the driving roller; Step A04, the displacement drive mechanism drives the spreader roller to descend, pressing the spreader roller against the printing media.

[0059] Step B describes a rotary drive mechanism that drives the spreading roller to rotate from the first state to... Figure 4 In the second state shown, the printing medium is adhered to the guide tape by rolling and pressing.

[0060] Step C: The active roller drives the guide belt to move. During the movement of the active roller, the rotary drive mechanism drives the spreading roller to rotate from the second state to the first state and then stops. The active roller stops moving when the printing medium on the guide belt is in the printing position.

[0061] During the printing process of step D, the rotary drive mechanism drives the spreading roller to rotate from the first state to the second state, and the printing medium is adhered to the guide belt by rolling and pressing.

[0062] Repeat steps C and D above until printing is complete.

[0063] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A belt-type digital printing machine, comprising at least a frame, a drive roller, a driven roller, a guide belt surrounding the drive roller and the driven roller, and a media flattening mechanism, characterized in that, The driven roller is provided with a driven roller mandrel, which is rotatably connected to the driven roller and rotatably connected to the frame; The media flattening mechanism includes at least: A rotary mechanism, comprising a pair of rotary mechanisms symmetrically mounted on both axial sides of the driven roller, is fixedly connected to the driven roller spindle. Each rotary mechanism includes at least a support base, a sliding base, and a displacement drive mechanism for driving the sliding base to move linearly relative to the support base. The support base is fixedly connected to the driven roller spindle. A guide shaft is provided at one end of the support base away from the driven roller spindle, and the sliding base is axially movably connected to the guide shaft. The sliding base is provided with a linear bearing or guide hole adapted to the guide shaft. A fixed base plate is provided at one end of the guide shaft away from the support base. The displacement drive mechanism is a cylinder mounted on the fixed base plate, and the piston rod end of the cylinder is fixedly connected to the sliding base. A spreading roller is located between a pair of rotary mechanisms. Both ends of the spreading roller are movably connected to sliding seats in the rotary mechanisms. The spreading roller has a first state located above the driven roller and a second state located on the side of the driven roller away from the driving roller. A rotary drive mechanism is fixedly connected to one end of the driven roller spindle and is used to drive the driven roller spindle to rotate bidirectionally. The driven roller spindle drives the spreading roller to reciprocate between a first state and a second state.

2. The belt-type digital printing machine according to claim 1, characterized in that, The rotary drive mechanism includes a worm gear reducer and a drive motor. The input end of the worm gear reducer is connected to the drive motor, and the output end of the worm gear reducer is connected to the driven roller spindle.

3. The belt-type digital printing machine according to claim 1 or 2, characterized in that, It also includes a displacement adjusting mechanism for adjusting the relative displacement between the driven roller and the driving roller. Two sets of the displacement adjusting mechanism are symmetrically installed on both sides of the driven roller's axial direction. The displacement adjusting mechanism includes at least: A slide rail, which is fixedly mounted on the frame; An adjusting seat is slidably connected to the slide rail, and the driven roller spindle is rotatably connected to the adjusting seat; An adjustment drive mechanism is provided on the side of the driven roller close to the driving roller and is used to drive the adjustment seat to move along the slide rail.

4. The belt-type digital printing machine according to claim 3, characterized in that, The adjustment drive mechanism includes an adjustment bolt and a bolt seat that is screwed into the adjustment bolt. The bolt seat is fixedly mounted on the frame, and one end of the adjustment bolt is fixedly connected to the adjustment seat.

5. A media flattening method for a belt-type digital printing machine according to any one of claims 1-4, characterized in that, At least the following steps are included: Step A: The rotary drive mechanism drives the spreader roller to a first state located above the driven roller, so that the printing medium passes through the gap between the spreader roller and the guide belt from the side away from the driving roller. Step B: The rotary drive mechanism drives the spreading roller to rotate from the first state to the second state, and the printing medium is adhered to the guide belt by rolling and pressing. Step C: The active roller drives the guide belt to move. During the movement of the active roller, the rotary drive mechanism drives the spreading roller to rotate from the second state to the first state and then stops. The active roller stops moving when the printing medium on the guide belt is in the printing position. In step D, during the printing process, the rotary drive mechanism drives the spreading roller to rotate from the first state to the second state, and the printing medium is adhered to the guide belt by rolling and pressing. Repeat steps C and D above until printing is complete.

6. The medium flattening method according to claim 5, characterized in that, Step A includes: In step A01, the rotary drive mechanism drives the spreading roller to move to the first state above the driven roller; Step A02: The displacement driving mechanism drives the spreading roller to rise, thereby increasing the gap between the spreading roller and the guide belt. Step A03: Pass the printing media through the gap between the spreader roller and the guide belt from the side away from the drive roller; The displacement driving mechanism described in step A04 drives the spreading roller to descend, causing the spreading roller to press against the printing medium.

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