JPS6160558A - Sheet feed roller - Google Patents

Abstract

PURPOSE:To form a projection, the forward end of which is sharpened to eat into a sheet satisfactorily even if it is low by forming a lot of pointed projections having inward curved surfaces on a surface member by edging and sticking ultra-hard particles to the surface of the projections. CONSTITUTION:A photosensitive material is applied to a thin plate roller surface member 16 formed of a material to be corroded, a mask 18 formed by disposing a lot of square transparent portions 18a on a black film regularly to be insular is placed on a photosensitive material layer, and light is applied to the member, so that the photosensitive material on the transparent portion 18a is exposed to light and fixed. Subsequently, the mask 18 is detached, and the member is washed, so that unfixed photosensitive material on the black portion of the mask 18 is washed away from the surface. When the surface member 16 is soaked in a corrosion liquid during a fixed time, corrosion is gradually progressed deeply from the portion 18 having no photosensitive material, so that the longitudinal section thereof is a round shape having the upper part thereof notched. Thus, a keen-edged projection 22 having inward curved surfaces 22a, 22b is formed. Subsequently, ultra-hard particles 30 comprising powder diamond particles No.500 are stuck to the surface of the projection by electroplating the obtain a low sharp projection.

Description

DETAILED DESCRIPTION OF THE INVENTION [“Industrial Application Field”] The present invention relates to a feed roller for driving paper used in automatic drafting machines and the like.

[Conventional technology]

As shown in FIG. 6, irregular protrusions are formed on the surface of the drive feed roller 2, and a paper 6 is placed between the protrusion surface of the feed roller 2 and the pressure roller 4. A recess is formed in the paper 6 by biting into the protrusion, and the recess is engaged with the protrusion to ensure that the paper 6 is fed forward and backward, and a drawing is drawn on the paper 6 with the writing instrument 10 attached to the drawing head 8. U.S. Patent No. 438 for automatic drafting machine
This method is proposed in Japanese Patent Publication No. 4298 (Japanese Unexamined Patent Publication No. 57-98398). Based on this proposal, a method has been developed in which protrusions are formed on the surface of the roller by etching technology. As shown in FIG. 5, this method involves preparing a plurality of film masks and etching the lowest part a of a strip-shaped metal plate 12 to form a protrusion 1 having a triangular cross-sectional shape.
4 is formed. The metal plate 12 on which the projections 14 are formed is wound around the roller body 2a by a known winding technique, thereby producing the driving feed roller 2.

[Problems that the invention attempts to solve]

When the cross-sectional shape of the protrusions is triangular, if the protrusions 14 are too thick, the paper 6 will be torn.

If the height of the protrusions 14 is low, there is a problem of abrasion and the tip cannot be sharpened, so there is a drawback that the protrusions 14 have poor grip on the paper.

The present invention aims to solve the above problems.

[Means to resolve issues]

In the present invention, a large number of pointed protrusions with inwardly curved surfaces are formed by etching on a roller surface member made of a material to be corroded, and fine carbide particles are fixed to the surface of the protrusions. be.

[Effect]

The tip of the protrusion becomes sharp due to the surface curving inward,
Even if the height of the protrusion is low, the protrusion digs into the paper sufficiently, and the protrusion is protected by a film of carbide particles to prevent wear.

〔Example〕

The configuration of the present invention will be explained below with reference to the accompanying drawings.

First, a thin plate-shaped roller surface member 16 made of a material to be corroded.
Apply photosensitive material to. Next, as shown in FIG. 3(, ), a mask 18 in which a large number of rectangular transparent portions 18a are regularly formed in a black film in the form of islands is placed over the photosensitive material layer on the surface of the surface member 16. The surface member 16 is exposed to light to expose the transparent portion 18a and the photosensitive material in the area where the mask 18 is not placed, thereby fixing the photosensitive material to the surface member 16.

Next, the mask 18 is removed from the surface member 16 and the surface member 16 is cleaned. At this time, the photosensitive material in the black portion of the mask 18 that has not been exposed to light and is not fixed on the surface member 16 is washed away from the surface of the surface member 16. next,
The surface member 16 is immersed in a corrosive liquid for a certain period of time. As time passes, corrosion gradually progresses inward from the portion 18b of the surface member 16 where there is no photosensitive material. As shown in Figure 1, this corrosion phenomenon causes the corroded volume to continue expanding over time.

Its vertical cross-sectional shape is circular with the top cut out.

Due to this corrosion phenomenon, a sharp protrusion (2J) having inwardly curved surfaces 22a and 22b is formed at the portion where the corroded parts 20 touch each other. It is not particularly limited to what is shown in FIG. 3(a).

As shown in FIG. 3(b), a mask 24 having a black opaque portion 24a formed on a transparent film may be used, or as shown in FIG. 3(c), a circular mask 24 may be used on a black opaque film. A feeding roller is constructed by wrapping a surface member 16 in the shape of a transparent portion 26a around the surface of the roller body.
The protrusions may be formed by directly etching the surface of the roller body made of a corrosive material.
Carbide particles 30 made of No. 500 powdered diamond particles are fixed to the surface of the protrusion 22 by a known electroplating technique.

〔effect〕

As mentioned above, even if the height of the protrusion is formed low, the present invention
The inwardly curved surface of the protrusion allows the tip of the protrusion to be sharpened, allowing the protrusion to bite firmly into the paper.Moreover, since the carbide particles are fixed to the surface of the protrusion,
There are effects such as being able to prevent wear of the sharp ends of the protrusions.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram, Figure 2 is a sectional view, Figure 3 is a plan view of the mask, Figure 4 is an explanatory external view, Figure 5 is an explanatory diagram, Figure 6 is a side view, and Figure 7 is a cross section. It is a diagram. 2...Feed roller, 4...Pressure roller, 6...Paper, 8...Drawing head, 1
0...Memorization tool, 12゜16...Surface member, 18.24.26...Mask. 18a, 26a...transparent part, 24a...
...opaque portion, 22a, 22b...curved surface,
30...Cemented carbide particle patent applicant Ayao Nishijima Patent attorney representing Muto Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 (C)

Claims (1)

[Claims] (1) A roller surface member made of a material to be corroded is etched to form a large number of pointed protrusions with surfaces that curve inward, and fine carbide particles are fixed to the surface of the protrusions. paper feed roller.