JP2003165033A - Manufacturing method of metal shaft for printing mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten manufacturing time of a metal shaft provided in a printing mechanism and to reduce its manufacturing cost. <P>SOLUTION: Plural lines of circumferentially extending annular grooves are formed by rolling in an outer circumferential wall of a columnar or tubular metal material (step S1), and the outer circumferential wall of the metal material formed with the annular grooves is ground (step S2). By the manufacturing method, since the plural lines of annular grooves can be formed at once by rolling, the manufacturing time is shortened in comparison with forming the annular grooves by cutting. Since the plural lines of annular grooves can be formed by one rolling machine, space necessary for forming the annular grooves is comparatively small, and plant and equipment investment can be suppressed also. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal shaft of a printing mechanism.

[0002]

2. Description of the Related Art Conventionally, a printing mechanism provided in a printing apparatus such as a printer or a copying machine is provided with a cylindrical or cylindrical metal shaft. The metal shaft of the printing mechanism is rotatably supported by the bearing and functions as, for example, a transport roller that transports the print medium. As the metal shaft of the printing mechanism, one having a plurality of annular grooves extending in the circumferential direction of the outer peripheral wall is used. For example, a member for suppressing the movement of the metal shaft in the axial direction is fitted in the annular groove. Further, the annular groove can be used as an axial reference position set on the metal shaft.

The metal shaft of the printing mechanism is required to have high processing accuracy with respect to the formation position and groove width of the annular groove and the uniformity of the outer diameter. Therefore, conventionally, in order to manufacture a metal shaft of a printing mechanism, first, a plurality of annular grooves are cut and formed on an outer peripheral wall of a cylindrical or cylindrical metal material by an NC lathe, thereby ensuring the processing accuracy of the annular groove. . Next, the outer peripheral wall of the metal material is ground to secure the outer diameter machining accuracy.

[0004]

However, in order to form a plurality of annular grooves by cutting, each annular groove must be individually formed with a single cutting tool. Therefore, it takes a long processing time, and since a large number of lathes must be provided for mass production, a vast space and a large amount of capital investment are required, which increases the manufacturing cost. The present invention has been made in view of the above problems, and an object of the present invention is to shorten the manufacturing time of the metal shaft provided in the printing mechanism and to reduce the manufacturing cost thereof.

[0005]

In the method of manufacturing a metal shaft of a printing mechanism according to the present invention, a plurality of annular grooves extending in the circumferential direction are formed on a peripheral wall of a cylindrical or tubular metal material by rolling. And a step of grinding the outer peripheral wall of the metal material in which the annular groove is formed. According to this manufacturing method, since a plurality of annular grooves can be formed at once by rolling, the manufacturing time is shorter than that in the case where the annular grooves are formed by cutting. Further, since a plurality of annular grooves can be formed by one rolling machine, the space required for forming the annular groove is relatively small, and the equipment investment can be suppressed. Therefore, according to this manufacturing method, it is possible to shorten the manufacturing period of the metal shaft provided in the printing mechanism and reduce the manufacturing cost thereof.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment showing an embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a schematic view showing the metal shaft 10 of the printing mechanism according to the embodiment of the present invention. The metal shaft 10 is formed of a metal material such as steel and has a columnar shape. The outer peripheral wall of the metal shaft 10 has three extending in the circumferential direction.
Ring-shaped annular grooves 12a, 12b, 12c are formed.

The annular grooves 12a, 12b have a rectangular cross section,
It is formed at one end 13 of the metal shaft 10 with a space therebetween. Ring-shaped or C-shaped rings 20a and 20b are fitted in the annular grooves 12a and 12b, respectively. Between the two rings 20a, 20b, two flat washers 14a,
The spring 16 and the bearing 22 sandwiched by 14b are arranged side by side in the axial direction around the metal shaft 10, whereby the movement of the metal shaft 10 in the axial direction is suppressed. The annular groove 12c has a V-shaped cross section, and is formed on the opposite side to the annular groove 12a with respect to the annular groove 12b. Annular groove 12c
Represents a reference position in the axial direction set on the metal shaft 10. On the opposite side of the annular groove 12a from the annular groove 12b, the gear 24 is fixed to the metal shaft 10 by the spring pin 18, and the rotation driving force transmitted to the gear 24 causes the metal shaft 10 to rotate.
Can be rotated.

FIG. 1 is a flow chart showing a method of manufacturing the metal shaft 10. 3 and 4 show step S of FIG.
1 shows a rolling machine 50 used in No. 1 and a rolling die 60 attached to the rolling machine 50, and FIG.
It is a figure which shows the centerless (centerless) grinder 80 used by step S2 of. Hereinafter, a method of manufacturing the metal shaft 10 will be described in detail.

First, in step S1 of FIG. 1, a plurality of annular grooves 12a to 12c are formed on the outer peripheral wall of a cylindrical metal material 30 by rolling. In this embodiment, the rolling machine 50 shown in FIG.
Although the rolling is carried out by a flat die method using, a round die method may be adopted. Pedestals 52, 52 of the rolling machine 50
Are opposed to each other at a predetermined interval, and are relatively moved in a direction parallel to each other during rolling. The pedestals 52 and 52 may be moved in directions opposite to each other as indicated by arrows A and B in FIG. 3, or one of them may be fixed and the other may be moved. Rolling dies 60 are attached to the facing surfaces of the bases 52, 52.

As shown in FIGS. 3 and 4, the rolling die 60 has blades 62a, 62b and 62c, which form annular grooves 12a, 12b and 12c, on a base 64. The rolling die 60 also includes a blade portion 62d that smoothes the end surface of the end portion 13 of the metal shaft 10 on the base 64. The blade portions 62a to 62d extend in parallel with the movement direction axis of the pedestal 52 and are arranged at intervals. Each of the blade portions 62a to 62d of the one rolling die 60 is connected to the other rolling die 6
Face each of the blade portions 62a to 62d of 0 directly. Each blade 62a-
62d is formed with a wedge-shaped introduction portion 66 whose width and height gradually increase toward the rear end, and each blade portion 62a-6.
It is easy for 2d to bite into the metal material 30. Blade 62
The positions of the introduction portions 66 of a, 62b, and 62c are different in the longitudinal direction of the base 64. Therefore, at the time of rolling, the timing at which the formation of the annular grooves 12a, 12b, 12c is started is different. In the groove portion 67 provided on each side of the blade portions 62a, 62b, 62c, the blade portions 62a, 62b, 62
A step surface (not shown) is formed to make the distance portion lower than the distance portion c.

An annular groove 1 is formed in the metal material 30 by using the rolling machine 50.
In order to form 2a to 12c, first, the metal material 30 is set between the front end portions 68 of the rolling dies 60 in the moving direction, and the metal material 30 is pinched. From this state, the pedestals 52 and 52 are moved in the A and B directions, respectively, as shown in FIG. Then, metal material 3
0 on the outer peripheral wall of each rolling die 60 of each blade portion 62a-62c
Penetrates from the introduction portion 66 in a predetermined order, and as a result, the annular grooves 12a to 12c are formed. At this time, the vicinity of the edges of the annular grooves 12a to 12c is recessed by the portion of the groove portion 67 near the blade portion, and the material flows into the recessed portions by being pressed by the blade portions 62a to 62c. The rise of the outer peripheral wall is reduced near the edge of ~ 12c. At this time, the end surface of the end portion 13 of the metal shaft 10 is smoothed by the blade portion 62d.

Next, in step S2 of FIG. 1, the annular groove 12
The outer peripheral wall of the metal material 30 on which a to 12c are formed is ground. For grinding, for example, a centerless grinding machine 80 shown in FIG. 5 is used. The centerless grinder 80 includes a grinding wheel 82 and an adjusting wheel 8.
4, a blade 86 and a grinding fluid supply unit 88.
The grinding wheel 82 and the adjusting wheel 84 both have a columnar shape, and are rotatably arranged around parallel central axes and are spaced apart from each other by a predetermined distance. The metal material 30 is set between the grinding wheel 82 and the adjusting wheel 84 in parallel with the axis. The blade 86 supports the set metal material 30 from below. The grinding fluid supply unit 88 supplies the grinding fluid between the grinding wheel 82 and the adjusting wheel 84.

In order to grind the metal material 30 using the centerless grinder 80, first, the metal material 30 is ground with the grinding wheel 82 and the adjusting wheel 8.
4 and the blade 86 supports it. Next, while supplying the grinding fluid from the grinding fluid supply unit 88, as shown in FIG. 5, the adjusting wheel 84 is rotated in the C direction and the grinding wheel 82 is rotated in the same D direction as the adjusting wheel 84. Then, the adjustment car 84
The metal material 30 is driven to rotate in the E direction opposite to the direction of the grinding wheel 82. Since there is a difference in peripheral speed between the grinding wheel 82 and the adjusting wheel 84, the outer peripheral wall of the metal material 30 is ground by the grinding wheel 82.

According to the method of manufacturing the metal shaft 10 described above,
By forming the annular grooves 12a to 12c by rolling, it is possible to achieve the same degree of processing accuracy as in the case of cutting with respect to the formation positions and groove widths of the annular grooves 12a to 12c. By scraping off, the outer shape of the metal shaft 10 can be finished, and the outer diameter of the metal shaft 10 can be made uniform in the axial direction.

Further, according to the above-described manufacturing method, since a plurality of annular grooves 12a to 12c can be formed at once by rolling, the manufacturing time can be shortened to, for example, about 1/6 as compared with the case of cutting. Moreover, according to the manufacturing method described above,
Since the plurality of annular grooves 12a to 12c can be formed by one rolling machine 50, space saving and cost reduction can be achieved.

Further, according to the above method, the annular groove 12a is formed.
Unlike the cutting process, chips are not discharged when forming the to 12c, so that the chip collecting operation can be omitted and the material is not wasted. Further, according to the method described above, when forming the annular grooves 12a to 12c, the crystal structure can be made dense by rolling without breaking the metal crystal unlike cutting, so that the toughness of the material is increased.

Although one embodiment of the present invention has been described in detail above, this is merely an example, and the present invention should not be construed as being limited by the description of such an embodiment. For example, although the method of manufacturing the metal shaft by using the cylindrical metal material has been described in the above-described embodiments, the metal shaft may be manufactured by using the cylindrical metal material. In the case of manufacturing a metal shaft using a cylindrical metal material, the material flows to the inner wall side of the metal material by being pressed by the blade part of the rolling die when forming the annular groove by rolling. . Therefore, it is possible to prevent the material from flowing in the axial direction and the metal shaft 10 to extend in the axial direction. Further, as compared with the case where a groove is formed in a circular metal material by cutting, the portion forming the bottom of the annular groove is thicker, so that the material strength is improved.

[Brief description of drawings]

FIG. 1 is a flowchart showing a method of manufacturing a metal shaft of a printing mechanism according to an embodiment of the present invention.

2A and 2B are schematic diagrams showing a metal shaft of a printing mechanism according to an embodiment of the present invention, in which FIG. 2A is a front view and FIG. 2B is a cross-sectional view for explaining an assembled state to the printing mechanism. .

FIG. 3 is a sectional view schematically showing a configuration of a rolling machine used in step S1 of FIG.

4 is an external perspective view schematically showing a rolling die attached to the rolling machine of FIG.

5 is a sectional view schematically showing the configuration of a centerless grinding machine used in step S2 of FIG.

[Explanation of symbols]

10 metal shaft 12a, 12b, 12c annular groove 30 metal materials 50 rolling machine 60 Rolling dies 80 centerless grinder

Claims (2)

[Claims] 1. A step of forming a plurality of annular grooves extending in a circumferential direction on an outer peripheral wall of a cylindrical or cylindrical metal material by rolling, and grinding the outer peripheral wall of the metal material in which the annular groove is formed. The method of manufacturing a metal shaft of a printing mechanism, comprising: 2. A metal shaft of a columnar or cylindrical printing mechanism, wherein a plurality of annular grooves extending in the circumferential direction are formed on the outer peripheral wall by rolling, and the outer peripheral wall is ground. And the metal shaft of the printing mechanism.