Printing medium anti-wrinkle device

Abstract

The utility model provides a printing medium anti-wrinkle device. The printing medium anti-wrinkle device comprises a printing platform and supporting rollers arranged at the front end and the rear end of the printing platform. A plurality of grooves are distributed in the upper surface of the printing platform, the printing platform is divided into a plurality of small-area supporting parts by the grooves, and each supporting part is used for supporting a passing printing medium; a plurality of annular grooves are distributed in the surface of the supporting roller in the axial direction and divide the surface of the supporting roller into a plurality of annular supporting parts, and the annular supporting parts are used for supporting passing printing media. The device can effectively prevent the printing medium from generating transverse wrinkles or ripples near the printing platform.

Description

Technical Field

[0001] The utility model relates to the technical field of printers, in particular to a printing medium wrinkle prevention device. Background Art

[0002] With the development of printers, the types of printing media materials are increasing. In one of the branches, the printing media are becoming thinner and thinner than traditional media, and the span of printing media is also getting larger and larger. This is due to both material development and cost control factors, which puts higher requirements on printing equipment.

[0003] Specifically, the printing medium needs to detour in the roller system during the printing process. The longer the detour path, the more likely it is to deform, such as horizontal wrinkles, corrugations, and other deformation problems.

[0004] The printing platform is the core of the printed pattern. Therefore, to ensure printing accuracy, wrinkles or ripples are not allowed near the printing platform.

[0005] Currently, the structures for tensioning the printing medium mainly include tension rollers and other structures, which tension the printing medium through its own gravity to prevent local folding of the printing medium. However, the main force direction of this tension roller is along the traveling direction of the printing medium, and there is still a lack of structures to constrain the deformation of the printing medium in the lateral direction of the printing medium.

[0006] In order to solve the above problems, people have been seeking an ideal technical solution. Utility Model Content

[0007] The purpose of the utility model is to address the deficiencies of the prior art and thus provide a printing medium anti-wrinkle device which can effectively prevent the printing medium from having transverse wrinkles or ripples near a printing platform.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a printing medium wrinkle prevention device, comprising a printing platform and support rollers arranged at the front and rear ends of the printing platform;

[0009] The upper surface of the printing platform is provided with a plurality of grooves, which divide the printing platform into a plurality of small-area support portions, each of which is used to support a passing printing medium;

[0010] The surface of the support roller is provided with a plurality of annular grooves distributed along the axial direction. The annular grooves divide the surface of the support roller into a plurality of annular support portions. Each annular support portion is used to support the passing printing medium.

[0011] Based on the above, the groove on the upper surface of the printing platform includes a vertical groove arranged along the traveling direction of the printing medium.

[0012] Based on the above, the groove on the upper surface of the printing platform further includes a prismatic grid groove covering the vertical groove.

[0013] Based on the above, a first support roller and a second support roller are arranged at the upstream end of the printing platform, the annular groove is arranged on the outer surface of the first support roller close to the printing platform, and a transverse groove extending axially and distributed circumferentially is arranged on the surface of the second support roller located upstream of the first support roller.

[0014] Based on the above, the transverse grooves in the second support roller divide the roller surface into a plurality of axially extending ridges, and each of the ridges is densely covered with flexible supporting hairs.

[0015] Based on the above, a rolling rod is provided immediately downstream of the printing platform.

[0016] Based on the above, a circular arc guide surface is provided on the downstream side of the rolling rod.

[0017] Based on the above, a third supporting roller is provided on the downstream side of the arc guide surface, and the annular groove is provided on the outer surface of the third supporting roller.

[0018] Based on the above, the upstream side of the printing platform forms a large arc angle under the support of the first support roller and the second support roller.

[0019] Based on the above, the downstream side of the printing platform forms a large arc angle under the support of the third support roller, the arc guide surface and the rolling rod.

[0020] The present invention has substantial features and progress compared to the prior art. Specifically, the present invention sets a groove structure on the surface of the printing medium, decomposing the entire support surface into several smaller support parts. When the printing medium passes through, it is supported by the densely distributed support parts, and the local position of the printing medium is deformed toward the grooves between the support parts, so that the deformation of the printing medium is dispersed and it is no longer easy to form large-area deformation problems, which is conducive to maintaining the extension of the printing medium; at the same time, several tiny deformations of the printing medium on the printing platform are controlled within the range constrained by the printing accuracy, thereby ensuring the printing quality.

[0021] In order to further ensure the extension of the printing medium, it is necessary to consider the control issues of the upstream and downstream of the printing medium. In the upstream area, two support rods are set. One support rod uses an annular groove to disperse the deformation of the printing medium from the lateral direction, controlling the occurrence of large-volume wrinkles. The other support rod is provided with a lateral groove and supporting upright hairs, and uses soft upright hairs to restrain wrinkles through flexible support.

[0022] In the downstream area, a rolling rod is set to cooperate with the guide surface, and a supporting roller with an annular groove is added to solve the problem of large-area wrinkles of the downstream printing medium.

[0023] This multi-position anti-wrinkle design can effectively solve the wrinkle problem of the printing medium near the printing platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional structural diagram of the printing medium anti-wrinkle device in the utility model.

[0025] Figure 2 It is a side view of the printing medium anti-wrinkle device in the utility model.

[0026] Figure 3 This is a partial view of the printing medium anti-wrinkle device in the present invention.

[0027] In the figure: 1. Printing platform; 2. First support roller; 3. Second support roller; 4. Rolling rod; 5. Arc guide surface; 6. Third support roller; 7. Printing medium; 11. Groove; 21. Annular groove; 31. Horizontal groove; 32. Supporting hairs. DETAILED DESCRIPTION

[0028] The technical solution of the present utility model is further described in detail below through specific implementation methods.

[0029] like Figure 1 、 Figure 2 and Figure 3 As shown, a printing medium wrinkle prevention device includes a printing platform 1 and support rollers arranged at the front and rear ends of the printing platform.

[0030] In this embodiment, a plurality of grooves 11 are distributed on the upper surface of the printing platform 1 , and the grooves divide the printing platform into a plurality of supporting portions of small areas, each supporting portion being used to support a passing printing medium 7 .

[0031] The principle is that when the printing medium passes through the printing platform, it is supported by densely distributed support parts. At the grooves formed between the support parts, the printing medium has no support and undergoes a slight downward deformation. However, due to the dense distribution and large number of grooves, this tiny downward deformation is also dispersed, so that the deformation trend of the printing medium is controlled and no longer prone to large-area deformation, thus ensuring the flatness of the printing process. At the same time, by controlling the groove size to adapt to the printing medium, the slight deformation caused by the densely distributed grooves is within the allowable printing accuracy range and will not affect the printing quality.

[0032] In this embodiment, the grooves on the upper surface of the printing platform include vertical grooves arranged along the traveling direction of the printing medium, and prismatic grid grooves covering the vertical grooves, forming a complex and regularly distributed groove panel as a whole.

[0033] The surface of the support roller is provided with a plurality of annular grooves distributed along the axial direction. The annular grooves divide the surface of the support roller into a plurality of annular support portions. Each annular support portion is used to support the passing printing medium.

[0034] The principle of the support roller working is:

[0035] The printing medium is usually tightened by a tension roller with a counterweight in the traveling direction to prevent wrinkles, but there is no constraint in the transverse direction. After the annular support parts distributed on the support roller support the printing medium, several tiny annular grooves are formed between the annular support parts. The printing medium produces a tiny deformation toward each annular groove in the transverse direction, making it no longer easy to cause larger deformation, and the tiny deformation is within the set printing accuracy range, thereby solving both the accuracy problem and the support problem.

[0036] In a specific embodiment, a first support roller 2 and a second support roller 3 are provided at the upstream end of the printing platform 1, the annular groove 21 is provided on the outer surface of the first support roller 2 close to the printing platform 1, and a transverse groove 31 extending axially and distributed circumferentially is provided on the surface of the second support roller 3 located upstream of the first support roller 2. The transverse grooves in the second support roller divide the roller surface into a number of axially extending ridges, and each of the ridges is densely covered with flexible supporting upright hairs 32.

[0037] Among them, the first support roller 2 prevents the printing medium from wrinkling through the aforementioned principle, and the second support roller uses soft supporting hairs 32 to support the printing medium to adapt to its deformation trend and prevent wrinkles from occurring. The two are one in front and the other behind. The second support roller 3 first prevents the printing medium from deforming, and then the first support roller 2 disperses the printing medium deformation.

[0038] A rolling rod 4 is provided on the downstream side of the printing platform 1 for connecting the printing platform 1 and the arc guide surface 5. The downstream side of the rolling rod 4 is provided with an arc guide surface 5. The downstream side of the arc guide surface 5 is provided with a third support roller 6. The annular groove is provided on the outer surface of the third support roller 6, and its principle is the same as that of the first support roller.

[0039] The upstream side of the printing platform 1 forms a large arc angle under the support of the first support roller 2 and the second support roller 3, and the downstream side of the printing platform 1 forms a large arc angle under the support of the third support roller 6, the arc guide surface 5 and the rolling rod 4.

[0040] This large arc angle design can fully support the printing medium, avoid deformation problems such as rib marks caused by small local corners of the printing medium, and reduce the probability of the occurrence of lines. At the same time, the upstream and downstream cooperate with the printing platform to form a larger support surface, forming almost 95% of the support area in the printing area centered on the printing platform, so that even if the paper is suspended in some places, it is not easy to wrinkle.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and not to limit it; although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solution of the utility model, they should all be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A printing medium wrinkle prevention device, characterized in that: It includes a printing platform and support rollers arranged at the front and rear ends of the printing platform; The upper surface of the printing platform is provided with a plurality of grooves, which divide the printing platform into a plurality of small-area support portions, each of which is used to support a passing printing medium; The surface of the support roller is provided with a plurality of annular grooves distributed along the axial direction. The annular grooves divide the surface of the support roller into a plurality of annular support portions. Each annular support portion is used to support the passing printing medium.

2. The printing medium wrinkle prevention device according to claim 1, characterized in that: The groove on the upper surface of the printing platform includes a vertical groove arranged along the traveling direction of the printing medium.

3. The printing medium wrinkle prevention device according to claim 2, characterized in that: The groove on the upper surface of the printing platform further includes a prismatic grid groove covering the vertical groove.

4. The printing medium wrinkle prevention device according to any one of claims 1 to 3, characterized in that: A first support roller and a second support roller are arranged at the upstream end of the printing platform, the annular groove is arranged on the outer surface of the first support roller close to the printing platform, and a transverse groove extending axially and distributed circumferentially is arranged on the surface of the second support roller located upstream of the first support roller.

5. The printing medium wrinkle prevention device according to claim 4, characterized in that: The transverse grooves in the second supporting roller divide the roller surface into a plurality of axially extending ridges, and each of the ridges is densely covered with flexible supporting hairs.

6. The printing medium wrinkle prevention device according to any one of claims 1 to 3, characterized in that: A rolling rod is provided on the downstream side of the printing platform.

7. The printing medium wrinkle prevention device according to claim 6, characterized in that: The downstream side of the rolling rod is provided with an arc guide surface.

8. The printing medium wrinkle prevention device according to claim 7, characterized in that: A third supporting roller is provided on the downstream side of the arc guide surface, and the annular groove is provided on the outer surface of the third supporting roller.

9. The printing medium wrinkle prevention device according to claim 4, characterized in that: The upstream side of the printing platform forms a large arc angle under the support of the first support roller and the second support roller.

10. The printing medium wrinkle prevention device according to claim 8, characterized in that: The downstream side of the printing platform forms a large arc angle under the support of the third supporting roller, the arc guide surface and the rolling rod.

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