JPH0572844U - Print medium transport roller - Google Patents

Abstract

(57) [Summary] [Purpose] The transport roller arranged on the downstream side of the print head has a structure in which the character image on the print medium is not easily transferred. [Structure] Various particles 8 such as abrasive grains, glass particles, and metal particles were projected on the surface, and the surface was coated to form a roller.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a print medium conveying roller applied to a printer having a print head that uses an ink ribbon.

[0002]

[Prior Art]

 FIG. 1 is a schematic configuration diagram in which a printing unit of a printer is extracted. 1 is a print head, 2 is a ribbon cassette containing an ink ribbon, 3 is a platen, 4 is a transport roller on the upstream side of the print head, and 5 is a downstream side. And a reference numeral 6 is a printing medium which is conveyed in the direction of arrow A.

[0003]

[Problems to be solved by the device]

 In the above printer, a polyurethane rubber roller is generally used as the conveying rollers 4 and 5 to increase the conveying force even in the case of a thick medium, but the conveying roller 5 arranged on the downstream side of the print head is used. With the rubber roller, the character image printed on the print medium 6 is easily transferred to this rubber roller, particularly to the rubber roller on the same side as the print head, and the character image on the rubber roller is retransferred to the subsequent print medium 6 to form the print medium. There was a problem of making 6 dirty.

An object of the present invention is to solve the above-mentioned drawbacks of the conventional device and to make the transport roller arranged on the downstream side of the print head a structure in which a character image on a print medium is difficult to be transferred. is there.

[0005]

[Means for Solving the Problems]

 The above object is achieved by using a roller on the same side as the print head on the downstream side of the print head, which is formed by protruding abrasive grains, glass particles, metal particles or the like on the surface. This can also be achieved by coating the transport roller with a material having surface slipperiness and allowing the particles to project on the surface thereof.

[0006]

[Action]

 If a roller that has abrasive grains, glass particles, metal particles, etc. protruding upward from the surface is used as the transport roller on the print head side (image transfer surface side) on the downstream side of the print head, these projected particles cause Since the contact area between the roller surface and the print medium surface is reduced, the transfer of character images to the roller is significantly reduced. In this case, if the surface of the roller is coated with a surface-slipping material, the transfer prevention effect will be further enhanced.

Examples of the transport roller having such a structure include a toy roller and a ceramic roller, but a ceramic roller is more difficult to transfer than a toy roller and is low in cost.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a vertical cross-sectional view of the surface layer portion of the transport roller according to the embodiment, FIGS. 3A and 3B are vertical cross-sectional views of the toy roller and the ceramic roller, and FIG. 4 is an enlarged surface layer portion of the ceramic roller. FIG.

As shown in FIG. 2, the surface of the conveying roller 5 is coated with the coating layer 7, and the particles 8 such as abrasive grains, glass particles, and metal particles are projected on the surface with an appropriate density. It has a structure.

As a roller in which the particles 8 are projected at a predetermined density above the surface, a toy roller 5A as shown in FIG. 3A and a ceramic roller 5B as shown in FIG.

As shown in detail in FIG. 4, the ceramics roller 5B has a first coating layer 11, abrasive grains 8, and a second coating layer on the outer periphery of a roller 9 made of metal such as aluminum. 12 and the third coating layer 13 are formed in this order, the abrasive grains 8 are fixed, and the coating layer 7 having a surface smoothness such as fluororesin is formed on the outer surface of the ceramic layer 10. It is provided and configured.

In such a ceramics roller 10, the fluorine coating layer 7 on the outer surface prevents the adhesion of paper powder and the like, and the fluorine coating layer 7 and the abrasive grains 8 projecting upward from the fluorine coating layer 7. Due to both of the above actions, it is possible to suppress the transfer of the character image printed on the printing medium 6 to the maximum. Further, the ceramic roller is formed by coating the outer periphery of the roller 9 without using the entire roller as a ceramic, and thus the price is lower than that of the toy roller.

[0013]

[Effect of the device]

 According to the first aspect of the invention, the transfer of the character image on the print medium can be reduced by using the roller in which the particles are projected on the surface.

According to the second aspect of the invention, not only the particles are projected, but also the surface is coated with a material having lubricity (for example, fluorine coating), whereby the transfer prevention effect can be further enhanced. .

Further, according to the third aspect of the invention, it is possible to enhance the above effect by using a commercially available ceramic roller.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a printing unit of a printer.

FIG. 2 is a vertical cross-sectional view of a surface layer portion of a conveying roller according to an embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a toy roller and a ceramics roller applied as a conveying roller of the present invention.

FIG. 4 is a vertical sectional view of a surface layer portion of a ceramics roller.

[Explanation of symbols]

1 Print Head 2 Ribbon Cassette 3 Platen 5 Transport Roller Downstream of Print Head 1 Coating Layer (eg Fluorine Coating Layer) 8 Particles (eg Abrasive Grains) 5A Toy Roller 5B Used as Transport Roller 5 Used as Transport Roller 5 Ceramic roller

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B65H 27/00 B 7018-3F

Claims (3)

[Scope of utility model registration request] 1. A print medium conveying roller which is arranged on the downstream side of a print head using an ink ribbon and which is formed by protruding abrasive grains, glass particles, metal particles and the like on the surface. 2. The print medium carrying roller according to claim 1, wherein the material is coated with a material having surface lubricity, and particles are projected above the material. 3. The print medium carrying roller according to claim 1, wherein the print medium carrying roller comprises a ceramics roller.