JPH078623U - End structure of shaft member for office automation equipment - Google Patents

Abstract

(57) [Summary] [Objective] The end of the hollow shaft member for OA equipment can be applied to a conventional D-shaped gear and the fitting can be made firm. [Structure] According to the present invention, in a hollow shaft member 1 for OA equipment to which a functional member K such as a roller is attached, the split groove is 1 to 4% of the circumferential length before being molded into a D shape. The head flat surface 3 having a D-shaped cross section is formed by cutting the groove 3a at intervals such that the groove 3a is cut into a certain width and spring elasticity can be exhibited at the time of compression. The split groove 3a
It is characterized in that a fan-shaped inclined surface 4 in which a buffer groove 4a slightly wider than the split groove is engraved in a continuous manner is continuously provided, and a projection 5 is formed on a part of the flat surface of the head portion. As a result, ready-made gears can be used, and the fitting thereof becomes firm.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an end structure of a hollow shaft member to which a functional member such as a paper feeding roller used mainly in OA equipment such as a copying machine, a word processor, a facsimile, and a printer is attached.

[0002]

[Prior art]

 Many shaft members are used in OA equipment such as copiers, word processors, facsimiles, printers, etc. for paper feeding, paper pressing, transfer, and other purposes. Gears are attached for torque transmission. In connection with the gear and the shaft, conventionally, as shown in FIG. 7, a D-shaped concave portion is formed inside the gear, and the end of the shaft member is formed in the same D-shaped convex portion. , The gears are engaged with each other by concavo-convex to transmit the rotational force of the gear to the shaft member side.

By the way, since a solid material is conventionally used for the shaft member, and the solid material has a large weight and is expensive, the inventor of the present invention, on the other hand, reduces the weight and the material. For the purpose of reducing the price through the above-mentioned method, Japanese Patent Application No. 61-291775 proposes a means of using a hollow shaft tube in the shape of a pipe by omitting the contents.

Therefore, it has been studied to apply a hollow shaft pipe to a shaft member having such a D-shaped end structure. However, as shown in FIG. 8, a split groove is formed at the end of the pipe. When I tried to form a D-shaped shaft end by applying a pressing force to the head with a press or the like to dent it, the pressing force distorted the pipe diameter to the outside, and it became a normal diameter. There was an inconvenience such as having to cut out to restore it.

[0005]

[Problems to be solved by the device]

 The present invention has been made in view of the above-mentioned problems, and makes it possible to apply the end of the hollow shaft member to a conventional D-shaped gear and to improve the fitting thereof. It is a good addition.

[0006]

[Means for Solving the Problems]

 The end part structure of the shaft member for OA equipment is a hollow shaft member for OA equipment to which a functional member such as a roller is attached, and a sectional groove is formed at intervals so that spring elasticity can be exhibited. On the flat surface of the head, a fan-shaped inclined surface, which is connected to the split groove and has a buffer groove slightly wider than the split groove, is connected continuously, and a protrusion is formed on a part of the flat surface of the head. Is characterized by. It is desirable that the split groove be cut into a width of 1 to 4% of the circumferential length before being pressed into the D-shape.

[0007]

[Action]

 If the split groove is carved into a width of 1 to 4% of the circumferential length before forming into a D-shape, the deformation when molding into a D-shape will be absorbed by pressing, and the circular part will become the center circle. And form into a distortion-free shape. When the end of the shaft of the present invention is inserted into a gear having a D-shaped recess, it is pressed by the inner wall of the gear recess and contracts entirely through the buffer groove on the inclined surface and the split groove on the flat surface, and its reaction force. The elastic force of the leaf spring is exerted at, and the end is pressed into contact with the gear. At this time, the protrusion strengthens the contact force with the inner wall surface and enhances the fitting in the sliding contact state. At the time of manufacturing, since it is only necessary to engrave the split groove and to form by a press or the like, the manufacturing becomes simple.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 6, the present invention is used in an OA machine such as a copying machine, a word processor, a facsimile, a printer (the drawing shows a printer). , A shaft member 1 to which a functional member K such as a roller is attached for paper feeding and transfer. The end of the shaft member 1 is attached with a gear, a bearing or the like for transmitting the rotational force, and the present invention relates to the end structure when the gear G is attached.

Conventionally, the gear G has a recess S having a D-shaped cross section for fitting therein. However, the present invention is premised on that the gear G is used as it is without being deformed. And This is because, when a hollow shaft member is used, it is difficult to form a D-shape due to distortion and the like, and it is easier to manufacture if the gear is deformed by pin coupling or the like. In this case, new molding is required, and procurement of parts is troublesome for maintenance.

Therefore, first, in the structure of the end portion 2 of the shaft member 1 of the present invention, the split groove 3a has a width of 1 to 4% with respect to the circumferential length of the shaft tube before forming into a D-shape. Carve. That is, as shown in Fig. 4, when a circular shaft tube is pressed by a press or the like to form a shrinkage, the shrinkage is absorbed, and after the formation, the groove width is reduced. Is set to a width that allows spring elasticity to be exerted with respect to the rotational movement after fitting with the gear G or after mounting, and the value is 1 to 4%, and more preferably 2% with respect to the circumferential length. Specifically, a 1 mm-wide split groove 3a is carved into a tube having a radius of 8 mm, and the groove is formed into a D-shape. A 2 mm spacing was maintained. The length of the split groove is such that it can be fitted into the recess of the gear G, and is usually about 10 to 30 mm.

Then, by pressing with a press or the like to form a D-shape, a head flat surface 3 is formed on the head as shown in FIGS. 1, 2 and 3, and the head is further flattened. The buffer groove 4a is formed so as to be continuous with the flat surface 3 and slightly wider than the above-mentioned split groove 3a, and the inclined surface 4 inclined by about 20 to 45 °, more preferably 30 ° is formed. The inclined surface 4 and the buffer groove 4a play the role of a leaf spring in exerting spring elasticity based on the above-mentioned split groove 3a, and when fitted to the gear G and when rotated after mounting, The entire body exerts spring elasticity, facilitating fitting and enhancing adhesion to deepen the followability to rotational movement.

Further, as shown in FIG. 5 (B), a protrusion 5 for increasing the pressure contact force to the inner wall surface of the gear G is formed near the end of the flat portion 3 of the head. For example, in the case of a tube having a radius of 8 mm, the height is set to about 0.5 mm, the width is set to 1.5 mm, and the length is set to about 3 mm. The projections 5 are formed by press molding by forming the projections on a mold during the above molding.

Next, the operation of the shaft member according to the present invention will be described. Since the shaft member 1 according to the present invention is preliminarily formed with 1 to 4% of the circumferential groove 3a, as shown in FIG. Even when pressed by a D-shaped mold having a circular portion of the core circle, the width of the split groove is narrowed to absorb the deformation caused by the pressing force, and the circular portion is not distorted. When they are fitted into the gear recess S, they can be closely fitted to each other (see FIG. 5).

When the product after molding is fitted into a gear of a copying machine, a printer, etc., and mounted, the gear member G is fitted into the recess S of the shaft member 1 when fitted. When the end 2 is inserted, the split groove 3a is cut at intervals that can exert spring elasticity, so the groove width is narrowed once and the whole shrinks inward, but then the reaction force against the shrinkage repels the split groove 3a. The entire tubular body having 3a acts as a leaf spring. At that time, the inclined surface 4 and its buffer groove 4a play a role of a fan shape, adjust contraction and repulsion of the left and right plates of the flat surface 3, and double the resilience of the shaft member. Stick it to the inner wall of the gear.

Further, the projection 5 formed near the end of the end contacts the inner wall surface of the gear G after fitting, and the spring elasticity described above supports this and further increases the contact pressure.

As a result, not only the fitting of the gear G and the shaft member 1 is improved, but also the operation of the functional member K such as the roller associated with the rotational movement of the gear G is delayed, so-called backlash. Is eliminated, the followability to the rotational movement is improved, and the operation of the functional member K is extremely smoothed.

[0017]

[Effect of device]

 The shaft member of the present invention based on the above configuration and operation does not require new molding and is easy to maintain since the conventional gear can be used as it is when using the hollow shaft member. It exhibits excellent effects such as becoming. Also, since the entire end portion exhibits spring elasticity, close fitting is possible, the rotating force of the gear can be accurately transmitted by the functional member, and the manufacturing is easy and the cost can be reduced. Combines the effects.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an end portion of a shaft member of the present invention.

FIG. 2 is a partially cutaway vertical side view showing an end portion of the shaft member of the present invention.

FIG. 3 shows an end portion of the shaft member of the present invention, (A)
Is a front view, and (B) is a vertical sectional front view taken along the line AA of FIG. 1.

FIG. 4 is a schematic vertical sectional front view showing a process of molding the shaft member of the present invention.

FIG. 5 is a perspective view showing a shaft member and a gear of the present invention.

FIG. 6 is a perspective view showing a state where the shaft member of the present invention is attached to a printer.

FIG. 7 is a perspective view showing a relationship between a shaft end portion and a gear made of a conventional solid material.

FIG. 8 is a schematic front view in the case where a hollow shaft member is simply pressed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft member 2 End part 3 Head flat surface 3a Split groove 4 Sloping surface 4a Buffer groove 5 Protrusion

Claims (3)

[Scope of utility model registration request] 1. A hollow shaft member for OA equipment, to which a functional member such as a roller is attached, and a flat surface of a head having a D-shaped cross section in which split grooves having intervals capable of exhibiting spring elasticity are engraved, An end structure of a shaft member for OA equipment, characterized in that a fan-shaped inclined surface, which is connected to the split groove and is provided with a buffer groove, is continuously provided, and a projection is formed on a part of the flat surface of the head portion. . 2. The end structure of the shaft member for OA equipment according to claim 1, wherein the split groove is carved into a width of 1 to 4% of the circumferential length before being formed into a D shape. 3. The end structure of the shaft member for OA equipment according to claim 1, wherein the buffer groove is formed to be slightly wider than the split groove.