JP2008265958A - Shaft for roller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft for a roller having corrosion resistance not relating to environment problems of the waste liquid treatment or the like of an industrial chemical used for plating, attaining light weight and having a D cut-part for receiving a rotation drive force with high accuracy. <P>SOLUTION: The shaft 1 for the roller is characterized in that a hollow-like connection part 3 constituted of a circular plate 4 and a flat plate 5 is integrally formed at the end 7 of a hollow cylinder body 2 in which a rectangular metal thin plate is formed into a hollow cylindrical shape through an extension part 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to various roller shafts used in printers, copiers, fax machines, and the like, and more particularly to a cylindrical shaft that receives a rotational driving force.

  Conventionally, an OA device such as a printer, a copier, or a FAX has an elastic roller with a shaft in which a shaft of a solid round bar is inserted and bonded to the center of an elastic roller made of a resin such as urethane or rubber. It is used, or a roller provided with various functional materials by painting or the like on the surface of a single solid round bar. The material of the solid round bar may be plastic, but metals such as stainless steel, aluminum, aluminum alloy, and carbon steel are mainly used. Among them, carbon steel is used as disclosed in Patent Document 1. The case is common. However, the shaft of carbon steel needs to be plated for rust prevention, and there is a problem related to the environment of waste liquid treatment of industrial chemicals used for the plating. Moreover, since carbon steel is comparatively heavy, when it is used for a shaft as a part of OA equipment, there is a problem that it is contrary to the demand for weight reduction of the entire OA equipment.

  The problem of the waste solution of the plating solution is solved by using a non-ferrous metal or stainless steel, but the problem remains that the weight cannot be reduced as long as a solid round bar is used as the shaft. Therefore, it is conceivable to use a hollow round bar instead of using a solid round bar of stainless steel. As a reference technique, a conventional technique related to a paper feed roller can be cited.

As shown in FIG. 11, for example, in Patent Document 2, a metal tube 71 is prepared, a disk with a flange portion is formed from a perforated disk of a thin metal plate, and the outer flange 72 is used as a metal tube as a roller body. A technique relating to a metal paper feed roller 70 obtained by press-fitting into a 71 and a steel rod 74 as a roller shaft into an inner flange 73 is disclosed. Although this technique relates to a roller, not a shaft, it is possible to design and manufacture a roller shaft with reference to this technique by reducing the radial dimension (thickness).
Japanese Patent Laid-Open No. 2004-264568 JP-A-11-139612

  By the way, in order to reduce the weight of the shaft, referring to the technique disclosed in Patent Document 2 shown in FIG. 11, a steel bar 74 is directly attached to the end of the metal tube 71 as shown in FIG. Consider a method of forming a roller shaft having the metal pipe 71 as a shaft body by press-fitting. Here, if the D cut part 75 for receiving the rotational driving force is formed at the end of the steel bar 74 before press fitting, the D cut part 75 is provided by press fitting the steel bar 74 into the metal tube 71. The shaft is completed. However, it is necessary to keep the coaxiality of the metal tube 71 and the steel bar 74 within an allowable range. Therefore, if the press-fitting allowance is increased, a contradiction that deteriorates the press-fitting conditions such as an increase in press-fitting resistance occurs. In order to solve the problems associated with such press-fitting, there is a method in which a metal tube 71 and a steel bar 74 are joined by welding to form a roller shaft. Generally, however, welding of stainless steel requires advanced welding techniques and equipment. There is another problem that it is necessary and corrosion is likely to occur at the welded part. Moreover, although the technique which joins the steel bar 74 to the metal pipe 71 using an adhesive agent does not produce the problem in joining by welding, the further another problem which concerns on the sustainability of adhesive strength may arise.

  On the other hand, as a well-known technique, the end of the cylindrical shaft is inserted into the rotation drive transmission member, a hole is formed through the rotation drive transmission member and the end of the shaft, and a pin is inserted into the hole to rotate. Although a shaft capable of receiving a driving force is produced, there is a problem that it is not always easy to make a hole in a hollow cylindrical body made of stainless steel with high accuracy.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to have corrosion resistance without concern for environmental problems such as waste liquid treatment of industrial chemicals used for plating, to reduce weight, and to receive a robust and highly accurate rotational driving force. It is providing the roller shaft provided with the plane part.

  In order to achieve the above object, the roller shaft according to the first aspect of the present invention is a roller shaft formed of a hollow cylindrical body, and includes an arc-shaped plate portion and a flat plate portion at an end of the hollow cylindrical body. The hollow connecting portion is integrally formed. Here, the “flat plate portion” does not necessarily indicate a single flat plate, but also includes a flat plate portion. Moreover, the connection corner | angular part of an arc-shaped board part and a flat plate part shall include the case where it is curved surface shape.

According to a second aspect of the present invention, in the roller shaft according to the first aspect, the connecting portion is integrally formed with an end portion of the hollow cylindrical body via an extending portion.
According to a third aspect of the present invention, in the roller shaft according to the first or second aspect, the hollow cylindrical body is formed by stamping a rectangular metal thin plate.

  According to a fourth aspect of the present invention, in the roller shaft according to any one of the first to third aspects, the connecting portion is bent and extended from both ends in the circumferential direction of the arcuate plate portion. The flat plate portion is characterized in that its end portions are opposed to each other.

  According to a fifth aspect of the present invention, in the roller shaft according to any one of the first to third aspects, the connecting portion is integrated with an end portion of the hollow cylindrical body via an extending portion. The inferior arc of the formed hollow cylindrical body is formed in a flat plate portion having a ridge portion directed inward of the hollow cylindrical body.

  According to a sixth aspect of the present invention, in the roller shaft according to the first or second aspect, the connecting portion is a hollow cylinder formed integrally with an end of the hollow cylindrical body made of plastic via an extending portion. The inferior arc of the body is formed on the flat plate portion by a hot press.

(Function)
The roller shaft according to the present invention receives a rotational driving force from a driving source via a gear or the like by inserting a connecting portion formed by pressing at one end of a cylindrical shaft body into a receiving portion such as a gear. It is done. Accordingly, it is possible to avoid problems such as coaxiality, corrosion, and adhesive strength sustainability that occur when the D-cut shaft body is press-fitted, welded, or bonded to the shaft body.

  In the present invention, when a stainless steel or non-ferrous metal thin plate is used, it has a corrosion resistance and is strong and can receive a rotational driving force that is reduced in weight without being concerned with environmental problems such as waste liquid treatment related to plating. A roller shaft can be provided. In the present invention, it is possible to provide a plastic roller shaft that is cylindrical and receives a rotational driving force.

(First embodiment)
Hereinafter, an embodiment of a roller shaft embodying the present invention will be described with reference to FIGS. 1 to 3A and 3B. FIG. 1 is a partial perspective view showing a roller shaft having a substantially D-shaped connecting portion, and FIG. 2 is a plan view showing a state before (after trimming) a thin metal plate is formed into a hollow cylindrical body by bending. FIGS. 3A and 3B are partial cross-sectional views showing a process of forming a substantially D-shaped connecting portion from the hollow cylindrical body.

  As shown in FIG. 1, the roller shaft 1 is connected to an end 7 of a hollow cylindrical body 2 made of stainless steel via an extension 6 and an arcuate plate 4 and a bent portion 11 at the end. A substantially D-shaped connecting portion 3 constituted by the connected flat plate portions 5 is integrally formed. The substantially D-shaped connecting portion 3 serves as a D-cut portion that serves as a detent for connecting a gear or pulley (not shown) that receives a rotational driving force as the roller shaft 1. Here, as shown in FIG. 1, the flat plate portion 5 is not constituted by a single piece, but is constituted by two flat plate portions 5 with their respective end portions 8 facing each other. In FIG. 1, the gaps are clearly drawn so that gaps exist between the respective end portions 8, but there is no problem even if the gaps become zero due to the contact of the respective end portions 8. However, in consideration of manufacturing problems such as variations in lots of raw materials and variations in press processing, it is more stable to intentionally provide a gap rather than a specification in which each end 8 abuts. The roller shaft 1 can be obtained. Even if the flat plate portion 5 is composed of two pieces and there is an appropriate gap at each end portion 8, there is no problem as a D-cut portion for obtaining the rotational driving force in the roller shaft 1. In addition, when the bending process of the bent part 11 is insufficient, the respective end parts 8 of the two opposing flat plate parts 5 are lifted outward, but if there is an appropriate gap between the respective end parts 8 When the D-cut receiving part such as a gear is fitted on the connecting part 3, the two flat plate parts 5 can be deformed inward. In addition, the substantially D-shaped connecting portion 3 is fitted into a D-cut receiving portion such as a gear in a press-fitted state, and a reaction force of the bent portion 11 in an elastically deformed state acts, so that a reliable fitting is performed.

(Production method)
Next, a method of manufacturing the roller shaft 1 by press working will be briefly described with reference to FIG. First, a stainless steel rectangular metal thin plate 9 having a long side 14 and a short side 15 that are the same as the axial length and circumferential length of the roller shaft 1 is cut out from the raw material. In order to form the extending portion 6 and the arc-shaped plate portion forming portion 13 on the short side 15 side, a rectangular metal is formed so that a pair of notches 12 having appropriate widths face each other inward from the long side 14 side. The thin plate 9 is trimmed. The width of the notch 12 is appropriately selected as long as it does not interfere with the movement of a die or the like for press-forming the connecting portion 3. Next, each long side 14 on the short side 15 side from the notch portion 12 is trimmed to a predetermined length to form the end portion 8 to form the arcuate plate portion forming portion 13.

  Although not shown, the rectangular thin metal plate 9 trimmed to the developed shape of the roller shaft 1 is formed into the hollow cylindrical body 2 by bending using a press technique, and the extending portion 6 and the arc-shaped plate portion forming portion 13 are formed. And is formed into an arcuate plate portion 24 ((FIG. 3A)) having the same radius as the hollow cylindrical body 2. Next, as shown in FIG. The arc-shaped plate portion 24 is inserted into a gap formed by a mold 21 that accommodates the outer peripheral surface of the arc-shaped plate portion 4 and a substantially D-shaped mold 22 having an outer peripheral surface along the inner peripheral surface of the arc-shaped plate portion 4. When the protruding portion 25 that is not accommodated between the mold 21 and the mold 22 is pressed by the pressing mold 23, the substantially D-shaped connecting portion 3 is formed as shown in FIG.

According to the roller shaft 1 of the above embodiment, the following effects can be obtained.
(1) In the above embodiment, the hollow cylindrical body 2 and the arcuate plate part 4 are formed by bending the rectangular thin metal plate 9 made of stainless steel by the press working technique, and the arcuate plate part 4 and the flat plate part 5 are used as D. Since the cut portion is formed, it is possible to provide a roller shaft 1 that is lightweight and has corrosion resistance and can receive a rotational driving force.

  (2) In the above-described embodiment, the end portions 8 of the two flat plate portions 5 are separated from each other as appropriate so that a gap is provided. Therefore, an outward biasing force of the bent portion 11 is likely to act on the flat plate portion 5. When the substantially D-shaped connecting portion 3 is inserted into a D-cut receiving portion such as a gear, it can be fitted in a press-fitted state.

  (3) In the above-described embodiment, since the end portions 8 of the two flat plate portions 5 are separated and faced appropriately, variations due to manufacturing factors are easily absorbed and required as a D-cut portion. A connecting portion 3 having a substantially D shape can be formed.

In addition, you may change the said embodiment as follows.
-Although the stainless steel thin plate was used as the rectangular metal thin plate 9, another metal, for example, aluminum, an aluminum alloy, etc., may be sufficient.
-The hollow cylindrical body 2 was formed by bending a rectangular metal thin plate 9 into a cylinder by bending, but using a metal seamless pipe, a notch was formed in the vicinity of the end, leaving an extension, An axial separation part may be formed on the outer periphery of the cylinder on the end side from the notch part, and then a substantially D-shaped connection part 3 may be formed as shown in FIG.
Although the end portions 8 of the two flat plate portions 5 are separated and faced as appropriate, they may be brought into contact with each other without being separated.
Although the substantially D-shaped connecting portion 3 is integrally formed with the hollow cylindrical body 2 via the extending portion 6, the substantially D-shaped connecting portion 3 is directly integrated with the hollow cylindrical body 2 without forming the extending portion 6. It may be formed. The notch 12 at this time is for separating the end 7 of the hollow cylindrical body 2 and the arcuate plate portion forming portion 13 without having a width.

(Second Embodiment)
Next, a second embodiment of the roller shaft 1 embodying the present invention will be described with reference to FIGS. The second embodiment is different from the configuration in which the substantially flat D-shaped connecting portion 3 is formed by using the two flat plate portions 5 in the first embodiment, and the two flat plate portions 32 are provided with the protrusions 31. It is the structure which made it unite through. Therefore, detailed description of the same parts as those in the first embodiment is omitted.

  In FIG. 4, the substantially D-shaped connecting portion 3 is composed of an arc-shaped plate portion 4 and a flat plate portion 32 having a protruding portion 31 in the middle by connecting the bent portions 11 at both ends thereof. The hollow cylinder 2 is integrally formed. Since this protrusion 31 is an elastically deformable part, when the substantially D-shaped connecting part 3 of this embodiment is inserted into a D-cut receiving part such as a gear, it is in a press-fitted state using the elasticity of the protrusion 31. Can be fitted.

(Production method)
The manufacturing method will be described with reference to FIGS. 4 and 5A. A hollow cylindrical body 2 is formed using a seamless pipe made of stainless steel, a notch 40 is formed at a predetermined position thereof, and an arcuate plate portion 4 is formed at an end of the hollow cylinder 2 defined by the notch 40. Is inserted into a gap formed by a die 41 that accommodates the outer circumferential surface of the major arc 46 and a substantially D-shaped die 42 having an outer circumferential surface along the inner circumferential surface of the hollow cylindrical body 2. To do. A concave portion 45 for forming the ridge portion 31 is formed on the upper surface of the mold 42, and a convex portion 44 for forming the ridge portion 31 is formed on the pressing die 43. When the pressing die 43 presses the inferior arc 47 at the end of the hollow cylindrical body 2, as shown in FIG. Part 3 is molded. Here, since the circumference of the subarc 47 is longer than the length of the string, the protrusion 31 is for absorbing the difference.

Therefore, according to the second embodiment, in addition to the effects described in the first embodiment, the following effects can be obtained.
(1) In the second embodiment, since the notch 40 is formed in the stainless steel seamless pipe as the material, and the substantially D-shaped connecting portion 3 is formed by pressing, the manufacturing process is simplified. it can.

  (2) In 2nd Embodiment, since the protrusion part 31 is provided in the intermediate part of the flat plate part 32, the connection part 3 excellent in elastic force can be formed. Therefore, the substantially D-shaped connecting portion 3 of the present embodiment can be fitted into a D-cut receiving portion such as a gear in a press-fitted state, and the roller shaft 1 that can receive an accurate rotational driving force from a driving source can be provided.

Note that the second embodiment may be modified as follows.
Although a seamless pipe made of stainless steel is used as a material, a seamless pipe made of other metals such as aluminum or aluminum alloy may be used.
A stainless steel seamless pipe was used as the material, but as shown in the first embodiment, the rectangular thin metal plate 9 was bent into a hollow cylindrical body 2 and the ridge 31 was formed in the same manner as described above. You may form the substantially D-shaped connection part 3 which has.
Although the substantially D-shaped connecting portion 3 is integrally formed with the hollow cylindrical body 2 via the extending portion 6, the substantially D-shaped connecting portion 3 is directly integrated with the hollow cylindrical body 2 without forming the extending portion 6. It may be formed. The cutout 40 at this time is for separating the hollow cylindrical body 2 and the inferior arc 47 with almost no width.

(Third embodiment)
Next, a third embodiment of the roller shaft 1 embodying the present invention will be described with reference to FIGS. Unlike the above embodiment, the third embodiment has a configuration in which the arc-shaped plate portion 4 and the single flat plate portion 51 form a substantially D-shaped connecting portion 3 using a plastic pipe. is there. Therefore, detailed description of the same parts as those in the first and second embodiments is omitted.

  As is apparent from FIG. 6, the substantially D-shaped connecting portion 3 of the present embodiment is connected to both end portions of the arc-shaped plate portion 4 with a single flat plate portion 51, and is hollow through the extending portion 6. The cylindrical body 2 is integrally formed. The thickness of the flat plate portion 51 is thicker than the thickness of the plastic pipe that is the material. In addition, since the flat plate portion 51 is formed by hot pressing as described later, the formed outer shape is different from that of the press forming of the first or second embodiment, and has a predetermined shape without worrying about springback. Become.

(Production method)
The manufacturing method will be described with reference to FIG. 6 and FIG. The hollow cylindrical body 2 is formed by using a plastic pipe, a notch 40 is formed at a predetermined position, and the arc-shaped plate 4 is formed at the end of the hollow cylinder 2 defined by the notch 40. The arc 64 is inserted into a gap formed by a mold 61 that accommodates the outer circumferential surface of the dominant arc 64 and a substantially D-shaped mold 62 having an outer circumferential surface along the inner circumferential surface of the hollow cylindrical body 2. After heating the inferior arc 65 to a predetermined temperature with a heat source (not shown), if the pressing die 63 presses the inferior arc 65 at the end of the hollow cylindrical body 2, as shown in FIG. A connecting portion 3 composed of the arcuate plate portion 4 is formed. The plate thickness of the flat plate portion 51 is slightly thick because the circumference of the subarc 65 is longer than the length of the chord, so that the difference in length is absorbed.

Therefore, according to the third embodiment, the following effects can be obtained in addition to the effects described in the first and second embodiments.
(1) In the third embodiment, a notch 40 is formed at a predetermined position of a plastic pipe, and then a substantially arcuate arc 65 at the end of the hollow cylindrical body 2 is subjected to hot press molding to thereby form a substantially D-shaped connection. The part 3 can be formed integrally. Therefore, the roller shaft 1 having a D-cut portion with high shape accuracy for receiving the rotational driving force can be provided.

  (2) In the third embodiment, since a plastic roller shaft having a D-cut portion can be formed using a plastic pipe, a rotational driving force with a corrosion-resistant weight reduction can be received. A roller shaft can be provided.

Note that the third embodiment may be modified as follows.
The hollow cylindrical body 2 is formed by using a plastic pipe, and the notch 40 is formed at the predetermined position. However, the end of the hollow cylindrical body 2 is hot-pressed without forming the notch 40, and the flat plate 51 The substantially D-shaped connecting portion 3 constituted by the flat plate portion 51 and the arcuate plate portion 4 may be formed. At this time, the extending portion 6 includes an arc-shaped portion, an oblique curved surface connecting the end of the flat plate portion 51 and the end of the hollow cylindrical body 2.

(Fourth embodiment)
Next, a fourth embodiment of the roller shaft 1 embodying the present invention will be described with reference to FIG. The fourth embodiment is different from the first embodiment in which the flat plate portion 5 is connected to both ends of the arc-shaped plate portion 4 via the bent portions 11 in the first embodiment. This is a configuration in which the two flat plates 5 are additionally arranged at a target position with respect to the axis of the arc-shaped plate 4 to form a hollow connecting portion 3. Therefore, detailed description of the same parts as those in the first embodiment is omitted.

  In the fourth embodiment, as shown in FIG. 8, the two flat plate portions 85 are formed at positions symmetrical to the two flat plate portions 5 with respect to the axis of the arcuate plate portion 4. Then, the flat plate portion 5, the arc-shaped plate portion 84, and the flat plate portion 85 are integrated in this order via the bent portion 11, respectively, and the cross-sectional shape becomes a substantially inverted U shape, and the flat plate portion 85, the arc-shaped plate portion 84. And the flat plate part 5 is arranged so that the cross-sectional shape integrated through the bent part 11 in this order faces the substantially U-shaped part, and the connecting part 3 is formed.

  The manufacturing method is different from the first embodiment in that when the rectangular thin metal plate 9 made of stainless steel is cut out from the raw material and trimmed into a developed shape, two arc-shaped plate portion forming portions 13 are provided side by side at intervals. However, since the manufacturing procedure is almost the same, the description thereof is omitted.

Therefore, according to the fourth embodiment, the following effects can be obtained in addition to the effects described in the first to third embodiments.
(1) In the fourth embodiment, since the two flat plate portions 5 and the two flat plate portions 85 are formed in parallel to the axial object, it is possible to provide the connecting portion 3 in which the rotational driving force is transmitted more reliably. .

(Fifth embodiment)
Next, a fifth embodiment of the roller shaft 1 embodying the present invention will be described with reference to FIG. Note that the fifth embodiment differs from the second embodiment in that it is formed so as to connect the arcuate plate portion 4 and the two flat plate portions 32 integrated via the ridge portion 31. Two flat plate portions 932 integrated through the strip portion 31 are additionally arranged at the target position with respect to the flat plate portion 32 with respect to the axis of the arcuate plate portion 4 so as to be a hollow connecting portion 3. It is a configuration. Therefore, detailed description of the same parts as those of the second embodiment is omitted.

  In the fifth embodiment, as shown in FIG. 9, two flat plate portions 932 integrated via the ridge portion 31 are arranged via the ridge portion 31 with respect to the axis of the arcuate plate portion 4. The two flat plate portions 32 integrated with each other are formed at symmetrical positions. Then, the flat plate portion 32, the arc-shaped plate portion 94, and the flat plate portion 932 and the arc-shaped plate portion 94 integrated through the protruding portion 31 are bent in this order. A hollow connecting portion 3 integrated through 11 is formed. In the present embodiment, as shown in FIG. 9, the two ridges 31 are formed so that the tops thereof are in contact with each other, but are not necessarily in contact with each other, and are appropriately spaced. Also good. The interval is appropriately determined depending on the position of the chord of the subarc 47 and the size of the protrusion 31 to absorb the difference between the circumference of the subarc 47 and the length of the chord. As for the manufacturing method, although another mold to be added to the mold used in the second embodiment is necessary, the procedure of the second embodiment may be repeated in substantially the same manner, and the description thereof will be omitted.

Therefore, according to the fifth embodiment, in addition to the effects described in the first to fourth embodiments, the following effects can be obtained.
(1) In 5th Embodiment, the flat plate part 32 integrated via the protrusion 31 and the flat plate part 932 integrated via the protrusion 31 are arrange | positioned in parallel, and the connection part 3 is provided. Since it is formed, it is possible to provide the connecting portion 3 capable of transmitting a larger rotational driving force.

  (2) In the fifth embodiment, since the connecting portions 3 are formed by arranging the two protrusions 31 so that the respective top portions are in contact with each other, the connecting portions 3 capable of transmitting a larger rotational driving force. Can provide.

(Sixth embodiment)
Next, a sixth embodiment of the roller shaft 1 embodying the present invention will be described with reference to FIG. The sixth embodiment is different from the third embodiment in which both ends of the flat plate portion 51 are connected by the arc-shaped plate portion 4, and the flat plate portion 151 is used as the axis of the arc-shaped plate portion 4. On the other hand, it is the structure which was additionally arranged in the position which becomes the flat plate part 51 and object, and was set as the hollow connection part 3. FIG. Therefore, detailed description of the same parts as those of the third embodiment is omitted.

  In the sixth embodiment, as shown in FIG. 10, the flat plate portion 151 is disposed at a target position with respect to the flat plate portion 51 with respect to the axis of the arc-shaped plate portion 4. The flat plate portion 151 and the arc-shaped plate portion 104 are integrated in this order via the bent portion 11 to form a hollow connecting portion 3. As for the manufacturing method, although another mold to be added to the mold used in the third embodiment is required, the procedure of the third embodiment may be repeated almost in the same manner, and thus the description thereof is omitted.

Therefore, according to the sixth embodiment, the following effects can be obtained in addition to the effects described in the first to fifth embodiments.
(1) In 6th Embodiment, since the flat plate part 51 and the flat plate part 151 were formed in parallel with the axis | shaft object, the connection part 3 in which transmission of rotational drive force is performed more reliably can be provided.

The partial perspective view of the shaft for rollers provided with the substantially D-shaped connection part which materialized the present invention. The top view which shows the state before shape | molding a metal thin plate in a hollow cylinder by bending process in 1st Embodiment of this invention (after trimming). (A), (b) is a partial cross section figure which shows the process of shape | molding a substantially D-shaped connection part from a hollow cylinder in 1st Embodiment of this invention. The partial perspective view of the shaft for rollers provided with the substantially D-shaped connection part in a 2nd embodiment of the present invention. (A), (b) is a partial cross section figure which shows the process of shape | molding a substantially D-shaped connection part from a hollow cylinder in 2nd Embodiment of this invention. The partial perspective view of the shaft for rollers provided with the substantially D-shaped connection part in a 3rd embodiment of the present invention. (A), (b) is a partial cross section figure which shows the process of shape | molding a substantially D-shaped connection part from a hollow cylinder in 3rd Embodiment of this invention. The partial perspective view of the shaft for rollers provided with the hollow connection part in 4th Embodiment of this invention. The partial perspective view of the shaft for rollers provided with the hollow connection part in 5th Embodiment of this invention. The partial perspective view of the shaft for rollers provided with the hollow connection part in 6th Embodiment of this invention. FIG. 6 is a partial cross-sectional view of a metal paper feed roller in the prior art. The partial cross section figure of the shaft which consists of a metal pipe and the rod-shaped body with D cut which can be easily thought of from the prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Roller shaft, 2 ... Hollow cylindrical body, 3 ... Connection part, 4 ... Arc-shaped board part, 5 ... Flat plate part, 6 ... Extension part, 7 ... End part, 8 ... End part, 9 ... Rectangular metal thin plate 11 ... Bending part, 31 ... Projection part, 32 ... Flat plate part, 46 ... Superior arc, 47 ... Inferior arc, 51 ... Flat part, 64 ... Superior arc, 65 ... Inferior arc

Claims (6)

  A roller shaft formed of a hollow cylindrical body, wherein a hollow connecting portion composed of an arc-shaped plate portion and a flat plate portion is integrally formed at an end portion of the hollow cylindrical body.   2. The roller shaft according to claim 1, wherein the connecting portion is integrally formed with an end portion of the hollow cylindrical body via an extending portion.   The roller shaft according to claim 1 or 2, wherein the hollow cylindrical body is formed by punching a rectangular metal thin plate.   4. The connection portion according to claim 1, wherein a flat plate portion that is bent and extended from both end portions in the circumferential direction of the arc-shaped plate portion is opposed to the end portion thereof. 5. The shaft for rollers as described in 2.   The connecting portion is formed by forming an inferior arc of a hollow cylindrical body integrally formed at an end portion of the hollow cylindrical body via an extending portion in a flat plate portion having a ridge portion directed inward of the hollow cylindrical body. The roller shaft according to any one of claims 1 to 3, wherein the roller shaft is provided.   2. The connecting portion according to claim 1, wherein an inferior arc of a hollow cylindrical body integrally formed on an end portion of the hollow cylindrical body made of plastic via an extension portion is formed on a flat plate portion by a hot press. 2. The roller shaft according to 2.

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