Filament separating cloth guide roller and digital printing equipment

Abstract

The utility model is suitable for the technical field of digital printing, and provides a silk separating cloth guide roller and digital printing equipment. The silk separating cloth guide roller comprises a roller body, spiral grooves with opposite spiral directions are formed in the two sides of the middle of the outer surface of the roller body respectively, the two spiral grooves with the opposite spiral directions extend to the two ends of the roller body from the middle of the roller body respectively, and the groove bottoms of the spiral grooves form concave surfaces relative to the outer surface of the roller body. And the outer surface of the roller body between two adjacent groove bottoms forms a convex surface relative to the groove bottoms of the spiral grooves. The silk separating cloth guide roller provided by the utility model can better remove wrinkles on a printing medium which generates certain tension after being wetted by ink, so that the printing effect can be better improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of digital printing, and in particular relates to a wire-separating cloth guide roller and digital printing equipment. Background Art

[0002] Digital printing equipment achieves printing function by spraying ink onto the printing medium. The printing medium is mainly transported by rollers. In existing digital printing equipment, after the ink is sprayed onto the printing medium, the printing medium is transported by a light roller, and the printing medium is prone to wrinkles, especially paper media. After inkjet printing, the ink will penetrate and diffuse, causing the surface area of ​​the paper medium to expand, the surface tension of the medium to be uneven, and the paper medium will produce a certain degree of relaxation. When passing through the light roller, wrinkles are particularly prone to occur. Utility Model Content

[0003] The utility model provides a filament guide roller, which aims to solve the problem in the prior art that a printing medium is easily wrinkled after being stretched by inkjet.

[0004] The utility model is implemented as follows: a wire guide roller comprises a roller body, wherein the outer surface of the roller body is provided with spiral grooves with opposite spiral directions on both sides of the middle thereof, the two spiral grooves with opposite spiral directions extend from the middle of the roller body to both ends thereof, the groove bottom of the spiral groove is formed as a concave surface relative to the outer surface of the roller body, the outer surface of the roller body located between two adjacent groove bottoms is formed as a convex surface relative to the groove bottom of the spiral groove, a plane transition is adopted between the concave surface and the convex surface, and the planes on both sides of the concave surface are inclined outward relative to the concave surface.

[0005] Furthermore, the widths of the convex surface and the concave surface along the axis direction of the roller body are equal.

[0006] Furthermore, the height difference between the concave surface and the convex surface is 0.2 mm to 0.3 mm.

[0007] Furthermore, the pitch of the spiral groove is equal to 1 / 8 to 1 / 6 of the outer diameter of the roller body.

[0008] Furthermore, mounting portions are provided at both ends of the roller body.

[0009] Furthermore, the roller body is made of a rigid material, and the interior of the roller body is a hollow structure.

[0010] The present utility model also provides a digital printing device, comprising a machine body, a printing platform arranged on the machine body and at least one of the aforementioned filament guide rollers, at least one of the filament guide rollers being rotatably arranged on one side of the output end of the printing platform, and the printing medium passing through the printing platform and being wound around the filament guide roller and then moving to a rear workstation.

[0011] The beneficial effect achieved by the present invention is that the middle part of the roller body perpendicular to the axial direction is used as a dividing line, and spiral grooves with opposite spiral directions are provided on both sides of the dividing line on the outer surface of the roller body. When the printing medium is wrapped on the outer surface of the roller body and the roller body rotates to convey the printing medium, the presence of the concave surface increases the stroke of the roller body along the axial direction. When the printing medium wetted by ink and generating a certain tension passes through the roller body, the printing medium can be spread on the convex surface and partially sink into the concave surface, thereby flattening the printing medium to a certain extent. When part of the printing medium sinks into the concave surface, the plane can support the printing medium located between the concave and convex surfaces to a certain extent, which can avoid Creases are generated on the printing medium between the concave and convex surfaces; at the same time, when the roller makes circular motion during operation, the spiral grooves with opposite spiral directions can generate a certain guiding force on the printing medium from the middle of the roller to the two ends. Under the action of this guiding force, the printing medium will be stretched and extended to both sides of the roller, thereby achieving the effect of expanding the width, further improving the flattening effect of the printing medium, and having a better wrinkle removal effect on the printing medium. The printing medium that is partially sunken into the concave surface can also be better transferred from the concave surface to the convex surface through the plane during the rotation of the roller, and can also be transferred from the convex surface to the concave surface through the plane, which can make the printing medium expand more smoothly from the middle of the roller to the two ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a three-dimensional diagram of a wire-separating cloth guide roller provided by the utility model;

[0013] Figure 2 This is a front view of a wire-separating cloth guide roller provided by the utility model;

[0014] Figure 3 It is a schematic plan view of the concave surface, flat surface and convex surface of the yarn distribution roller provided by the utility model in the cross-sectional direction;

[0015] Figure 4 This is a schematic diagram of the main device structure of a digital printing device provided by the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] See also Figure 1-Figure 4 The embodiment of the utility model provides a filament guide roller, comprising a roller body 1, the outer surface 1a of the roller body 1 is from the middle ( Figure 1The two sides of the roller body 1 are provided with spiral grooves 11 with opposite spiral directions, and the two spiral grooves 11 with opposite spiral directions extend from the middle of the roller body 1 to both ends ( Figure 1 ), the bottom of the spiral groove 11 is formed as a concave surface 1b relative to the outer surface of the roller body 1, and the outer surface 1a of the roller body 11 located between two adjacent groove bottoms is formed as a convex surface 1c relative to the bottom of the spiral groove 11. A plane 1d is used to transition between the concave surface 1b and the convex surface 1c. The planes 1d on both sides of the concave surface 1b are inclined outward relative to the concave surface 1b, that is, the concave surface 1b, the convex surface 1c and the plane 1d all have a spiral structure on the roller body.

[0018] By using the middle part of the roller body 1 perpendicular to the axial direction as a dividing line, and providing spiral grooves 11 with opposite spiral directions on both sides of the dividing line on the outer surface 1a of the roller body 1, when the printing medium 100 is wrapped on the outer surface 1a of the roller body 1 and the roller body 1 rotates to convey the printing medium 100, the presence of the concave surface 1b increases the stroke of the roller body 1 along the axial direction. When the printing medium 100 wetted by ink and generating a certain tension passes through the roller body 1, the printing medium 100 can be spread on the convex surface 1c and partially sink into the concave surface 1b, thereby flattening the printing medium 100 to a certain extent. When part of the printing medium 100 sinks into the concave surface 1b, the plane 1d can support the printing medium 100 between the concave surface 1b and the convex surface 1c to a certain extent, which can avoid the concave surface 1b and the convex surface 1c from being distorted. At the same time, when the roller body 1 makes a circular motion during operation, the spiral grooves 11 with opposite spiral directions can generate a certain guiding force on the printing medium 100 from the middle part to the two ends of the roller body 1. Under the action of this guiding force, the printing medium 100 will be stretched and extended to both sides of the roller body 1, thereby achieving the effect of expanding the width, further improving the flattening effect of the printing medium 100, and having a better wrinkle removal effect on the printing medium 100. The printing medium 100 partially sunk into the concave surface 1b can also be better transferred from the concave surface 1b to the convex surface 1c through the plane 1d during the rotation of the roller body 1, and can also be transferred from the convex surface 1c to the concave surface 1b through the plane 1d, which can make the printing medium 100 expand more smoothly from the middle part to the two ends of the roller body 1.

[0019] The filament guide roller provided by the present invention can better remove wrinkles from the printing medium 100 that has a certain tension after being wetted by ink, thereby better improving the printing effect.

[0020] It should be noted that, since the print medium 100 has already been inkjetted, the ink droplets located on the print medium 100 have a certain weight. Therefore, even with the spiral grooves 11, the guiding force exerted by the spiral grooves 11 on the print medium 100 during the rotation of the roller 1 will not completely pull the print medium 100 out of the concave surface 1b. On the contrary, the spiral grooves 11 can better stretch the print medium 100, which has increased in weight due to the ink, thereby offsetting some of the force exerted by the ink on the print medium 100, ultimately achieving a better widening and wrinkle-removing effect.

[0021] Specifically, the plane 1d connecting the convex surface 1c and the concave surface 1b can be formed at one time when the spiral groove 11 is processed by using a matching forming cutter.

[0022] Furthermore, the convex surface 1c and the concave surface 1b have equal widths along the axis of the roller 1. This ensures that when the roller 1 performs circular motion, the guiding force exerted by the spiral groove 11 on the printing medium 100 along the axis of the roller 1 is uniform at all locations on the printing medium 100, thereby further improving the wrinkle removal effect.

[0023] Furthermore, the height difference between the concave surface 1b and the convex surface 1c is 0.2mm-0.3mm, that is, the groove depth of the spiral groove 11 is 0.2mm-0.3mm. This can avoid a large height difference between the convex surface 1c and the concave surface 1b, thereby preventing the printing medium 100 from sinking too much into the concave surface 1b and generating new wrinkles.

[0024] Furthermore, the pitch of the spiral groove 11 is equal to 1 / 8 to 1 / 6 of the outer diameter of the roller body 1. This ensures the tightness of the spiral groove 11 and prevents the spiral groove 11 from being too sparse, thereby reducing the density of the guiding force applied per unit area of ​​the printing medium 100 and affecting the wrinkle removal effect.

[0025] See also Figure 1 Furthermore, mounting portions 12 are provided at both ends of the roller body 1. Thus, the roller body 1 can be mounted on the following machine body 20 through the mounting portions 12.

[0026] Furthermore, the roller body 1 is made of a rigid material, and the interior of the roller body 1 is a hollow structure. The hollow structure can reduce the weight of the roller body 1 and reduce the material cost of the roller body 1.

[0027] See also Figure 4 The embodiment of the present invention also provides a digital printing device, including a body 20, a printing platform 30 arranged on the body 20, and at least one of the aforementioned filament guide rollers. One of the at least one filament guide rollers is rotatably arranged on the output end side of the printing platform 30 through the mounting portion 12. The printing medium 100 passes through the printing platform 30 and is wound around the filament guide roller and then extends to the rear station.

[0028] The digital printing device provided by the present invention can better remove wrinkles from the printing medium 100 that has a certain tension after being wetted by ink, thereby better improving the printing effect.

[0029] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A filament guide roller, characterized in that: The roller body comprises a roller body, wherein the outer surface of the roller body is provided with spiral grooves with opposite spiral directions from both sides of the middle thereof, and the two spiral grooves with opposite spiral directions extend from the middle of the roller body to both ends thereof respectively, and the groove bottom of the spiral groove is formed as a concave surface relative to the outer surface of the roller body, and the outer surface of the roller body located between two adjacent groove bottoms is formed as a convex surface relative to the groove bottom of the spiral groove, and a plane transition is adopted between the concave surface and the convex surface, and the planes on both sides of the concave surface are inclined outward relative to the concave surface.

2. The filament guide roller according to claim 1, wherein: The widths of the convex surface and the concave surface along the axis direction of the roller body are equal.

3. The filament guide roller according to claim 1 or 2, characterized in that: The pitch of the spiral groove is equal to 1 / 8 to 1 / 6 of the outer diameter of the roller body.

4. The filament guide roller according to claim 1, wherein: The height difference between the concave surface and the convex surface is 0.2 mm to 0.3 mm.

5. The filament guide roller according to claim 1, wherein: Mounting parts are provided at both ends of the roller body.

6. The filament guide roller according to claim 1, wherein: The roller body is made of rigid material, and the interior of the roller body is a hollow structure.

7. A digital printing device, characterized in that: It includes a machine body, a printing platform arranged on the machine body and at least one filament guide roller as described in any one of claims 1 to 6, at least one of the filament guide rollers is rotatably arranged on the output end side of the printing platform, and the printing medium passes through the printing platform and is wound around the filament guide roller and then moves to the next workstation.

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