JP2002303362A - Connecting member and driving force transmitting member with usage of it and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving force transmitting member and a manufacturing method thereof capable of preventing slip between a driving shaft, and a resin member with a simple structure without increasing a man hour for producing and capable of surely transmitting driving force. SOLUTION: A shaft member 10 to which the driving force is applied and the resin member 30 on which a tooth part 31 of a gear is formed are connected by the connecting member 20. When the connecting member 20 is molded, the resin member 30 is insert-molded with the connecting member 20 as an insert article. The resin constituting the inserted resin member 30 is filled in a cutout of a recessed and protruding part 24 formed on the connecting member 20. The shaft member 10 is pressed into the connecting member 20. Even when large driving force is applied to the shaft member 10, therefore, loss does not occurr in the transmission of the driving force caused by slip between the connecting member 20 and the resin member 30. Thus, the driving force is surely transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining member, a driving force transmitting component using the joining member, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a driving force generated by a driving means such as a motor is transmitted from a driving shaft to a driving force transmitting means such as a gear (hereinafter, a gear is referred to as a "gear"). The driving force transmitted to the driving force transmitting means is distributed to a plurality of driving units by a driving force distribution means such as a gear box, and transmitted to a predetermined portion. For example, in the case of a printer that prints an image, a plurality of rollers that convey a sheet are driven by a driving force transmitted from one driving unit.

When a plurality of driving units are driven by one driving unit as described above, a large force is generated from the driving unit. Conventionally, a gear is formed by sintering, and a molded portion of the gear and a hole to which a drive shaft is attached are integrally formed of metal or injection molded with resin.

[0004]

However, when the drive-side gear is formed of metal by sintering, and when the driven-side gear that meshes with the drive-side gear is formed of resin, the driven-side gear formed of resin is used. Gear wear is severe. for that reason,
The durability is reduced and the life of the driven gear is shortened.

On the other hand, when the driving gear is formed of resin, the precision of the molded portion of the driving gear can be improved.
In addition, wear of the driven gear is also reduced. However, since the drive shaft is usually made of metal, it is not possible to secure a sufficient fastening force between the drive shaft and the gear on the drive side. For this reason, when a large driving force is applied to the drive shaft and the gear, there is a problem that a slip occurs between the drive shaft and the gear. In order to prevent slippage, it is necessary to machine knurls on the drive shaft, which causes an increase in man-hours and manufacturing costs.

Accordingly, an object of the present invention is to provide a joining member for preventing rotation between a drive shaft and a resin member due to slippage. Another object of the present invention is to provide a driving force transmitting member for preventing slippage between a driving shaft and a resin member with a simple configuration without increasing the number of manufacturing steps, and for reliably transmitting a driving force, and manufacturing the driving force transmitting member. It is to provide a method.

[0007]

According to the joint member of the present invention, the metal joint member has a flange portion projecting in the outer peripheral direction. An uneven portion for preventing rotation of the resin member is formed on an outer peripheral portion of the flange portion.
The uneven portion is formed in the circumferential direction of the collar portion. When the joining member is insert-molded into the resin member, the resin member is filled in the uneven portions. Therefore, the space between the uneven portion and the resin member has a complicated shape. As a result, friction between the metal joining member and the resin member increases, and relative rotational movement with the joining member is prevented. Further, since the shaft member is press-fitted into the metal joining member, the relative rotational movement between the shaft member and the joining member is also prevented. Therefore, rotation due to slippage between the drive shaft and the resin member can be prevented.

According to a second aspect of the present invention, there is provided a driving force transmitting member including the joining member according to the first aspect. Therefore, the shaft member and the resin member can be joined to each other while preventing rotation due to slippage between the shaft member and the resin member. Therefore, loss of driving force due to slippage can be prevented,
Driving force can be transmitted reliably. Further, since only the concave and convex portions are formed on the outer peripheral portion of the joining member, slippage can be prevented with a simple configuration without increasing the number of manufacturing steps.

According to a third aspect of the present invention, the resin member is formed in a gear shape. Therefore, when the driving force transmitting member described in claim 2 is applied as a gear to which a large driving force is applied, it is possible to prevent slippage occurring between the driving shaft and the resin member.

According to the method of manufacturing a driving force transmitting member according to a fourth aspect of the present invention, after the hole is roughly formed, the hole is shaped into a predetermined shape. Therefore, the accuracy of the inner diameter of the hole can be improved, and the press-fitted drive shaft does not rattle or slip. Further, the outer peripheral side of the hole is formed in a predetermined shape, and a resin member is molded using the joining member as an insert product. Then, the shaft member is press-fitted into the hole of the joining member formed with the resin member. Therefore, it is not necessary to add a special process for forming the joining member and the driving force transmitting member, and the number of manufacturing steps is not increased.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 shows a driving force transmitting member according to an embodiment of the present invention. The driving force transmission member 1 according to the present embodiment is connected to, for example, a motor (not shown) that is a driving unit of a printer. The driving force transmitting member 1 includes a shaft member 10, a joining member 20, and a resin member 30. The shaft member 10 is a drive shaft of a motor, and its end is supported by a brush and a bearing (not shown) of the motor. The shaft member 10 is formed of a metal and has a columnar shape having a circular cross section perpendicular to the shaft.

The joining member 20 is provided on the outer peripheral side of the shaft member 10. The joining member 20 has a cylindrical portion 22,
As shown in FIGS. 2 and 3, a hole 21 through which the shaft member 10 penetrates is formed in the center of the cylindrical portion 22. Tube part 22
A flange 23 projecting from the cylindrical portion 22 in the outer peripheral direction is formed at one end. As shown in FIG. 3, the flange 23 has an uneven portion 24 formed on an outer peripheral portion. The uneven portion 24 includes a plurality of arc-shaped notches 24 a formed in the flange portion 23.
Is formed in the circumferential direction of the collar portion 23 by being formed at the end portion on the outer peripheral side of. The joining member 20 is formed of metal.

The resin member 30 is joined to the shaft member 10 via the joining member 20 as shown in FIG. The resin member 30 is formed in a gear shape, and has a tooth portion 31 on an outer peripheral portion as shown in FIGS. The resin member 30 is formed on the outer peripheral portion of the joining member 20 by insert-molding the joining member 20 as an insert product. Therefore, the notch 24a of the uneven portion 24 of the joining member 20 is filled with the resin member.

Next, a manufacturing procedure of the driving force transmitting member 1 having the above-described structure will be described with reference to FIGS. The first punch member 41 is driven into a predetermined position of the metal plate member 40. The first punch member 41 forms a roughly shaped hole 42 at a predetermined position of the plate member 40. In addition, due to the impact of the first punch member 41 into which the plate member 40 is driven, a portion on the side opposite to the side where the first punch member 41 is driven protrudes. Thus, a cylindrical portion 43 is formed around the hole 42. Since the hole 42 formed by the first punch member 41 has a low inner diameter accuracy, the shaft member 10
The shaft accuracy cannot be increased by press fitting. Therefore,
The second punch member 44 is driven into the hole 42 to enlarge the hole 42 to a predetermined inner diameter. By driving the second punch member 44, the hole 42 formed in a schematic shape is formed.
Is shaped into a predetermined shape. Thereby, the inner diameter accuracy of the hole 42 is ensured.

When the shaping of the hole 42 is completed, the plate member 40
The outer peripheral side of the hole 42 shaped into the shape shown in FIG. The press member 45 cuts out the plate member 40 so that the outer diameter of the outer peripheral side of the hole 42 is larger than the outer diameter of the cylindrical portion 43. Thereby, the joining member 20 having the flange 23 formed on the outer peripheral side of the cylindrical portion 22 as shown in FIG. 2 is formed. At the same time, since a not-shown uneven portion is formed on the press member 45, the uneven portion having a shape corresponding to the not-shown uneven portion of the press member is formed on the outer peripheral portion of the collar portion 23 as shown in FIG. 24 are formed.

The joining member 2 cut out as shown in FIG.
0 indicates that the resin member 30 is insert-molded as an insert product. Thus, a gear-shaped resin member 30 is formed on the outer peripheral side of the joining member 20. The joining member 20 and the resin member 30 are integrally formed by insert-molding the resin member 30 using the joining member 20 as an insert product.

When molding the resin member 30, the resin member 3
0 is filled in the uneven portion 24 of the joining member 20. As a result, as shown in FIG. 4, the space between the uneven portion 24 of the joining member 20 and the resin member 30 has a complicated and complicated shape. Therefore, the frictional force between the joining member 20 and the resin member 30 increases, and no slippage occurs between the joining member 20 and the resin member 30.

When the resin member 30 is formed on the outer peripheral portion of the joining member 20, as shown in FIG.
The shaft member 10 is press-fitted. The inner diameter of the hole 21 is the shaft member 1
The diameter of the shaft member 10 is equal to or slightly smaller than the outer diameter of 0, and the press-fitted shaft member 10 is firmly held in the hole 21. Therefore, the shaft member 10 does not rotate or move inside the hole 21. By press-fitting the shaft member 10 into the hole 21, the driving force transmitting member 1 in which the shaft member 10, the joining member 20 and the resin member 30 are integrated is formed.

As described above, according to the driving force transmitting member 1 according to one embodiment of the present invention, the joining member 20 and the resin member are formed by forming the uneven portion 24 on the outer peripheral portion of the flange portion 23 of the joining member 20. The friction increases with 30. Therefore, slip between the joining member 20 and the resin member 30 can be prevented, and relative rotation between the shaft member 10 and the resin member 30 can be prevented by the driving force applied to the shaft member 10. Therefore, even when the driving force applied to the shaft member 10 is large, the driving force can be transmitted without loss.

The unevenness 24 formed on the joining member 20 prevents slippage between the joining member 20 and the resin member 30. The uneven portion 24 can be formed simultaneously with cutting out the joining member 20. Therefore, the uneven portion 2
There is no need for a special step or treatment for the formation of 4, and no increase in man-hours and increase in manufacturing cost is caused. In addition, since the uneven portion 24 has a simple shape, it can be easily formed.

As described above, in the embodiment of the present invention, the example in which the driving force transmitting member is applied to the motor of the printer has been described. However, the present invention is not limited to a printer and can be applied as a driving force transmitting member for various devices that transmit driving force.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a driving force transmitting member according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line II-II of FIG.

FIG. 3 is a schematic plan view showing a joining member of a driving force transmitting member according to one embodiment of the present invention.

FIG. 4 is a schematic diagram showing a configuration of a driving force transmitting member according to one embodiment of the present invention.

FIG. 5 is a schematic view showing a manufacturing procedure of the driving force transmitting member according to one embodiment of the present invention, and is a view showing up to formation of a joining member.

FIG. 6 is a schematic view illustrating a manufacturing procedure of the driving force transmission member according to the embodiment of the present invention, and is a diagram illustrating a process from a formed joining member to the formation of the driving force transmission member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Driving force transmission member 10 Shaft member 20 Joining member 21 Hole 22 Cylindrical part 23 Collar part 24 Uneven part 30 Resin member 31 Tooth part 40 Plate member 41 First punch member 44 Second punch member

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) B29L 9:00 B29L 9:00 15:00 15:00 (72) Inventor Kenzoku Rokuhara Yamato 3 Suwa City, Nagano Prefecture 3-5-5 Seiko Epson Corporation (72) Inventor Keiichi Shiohara 3-3-5 Yamato Suwa City, Nagano Prefecture F term in Seiko Epson Corporation 3J030 AC03 BA01 BC01 BC08 BC10 BD06 4F206 AD03 AD12 AD25 AG03 AH12 JA07 JB12 JL02 JM14 JN11 JW41 4F213 AD03 AD07 AD24 AG03 AH12 WA41 WA52 WA63 WB01 WB11

Claims (4)

[Claims] 1. A metal joining member for joining a shaft member to which a driving force is applied and a resin member attached to the shaft member, wherein a hole for press-fitting the shaft member is formed in an axial direction. A cylindrical portion that is formed on the outer peripheral side of the cylindrical portion so as to protrude radially outward from the cylindrical portion; and an outer peripheral portion of the collar portion that is formed in a circumferential direction of the collar portion. And a concavo-convex portion. 2. The joining member according to claim 1, a shaft member press-fitted into the hole of the joining member, and a resin inserted into the joining member and formed on an outer peripheral side of the joining member. A driving force transmitting member, comprising: a member; 3. The driving force transmitting member according to claim 2, wherein the resin member is formed in a gear shape. 4. A hole forming step of driving a first punch member into a predetermined position of a plate member to form a substantially circular hole, and forming a second hole in the hole formed in the plate member. A hole shaping step of punching a punch member to shape the hole into a predetermined shape; cutting out an outer peripheral side of the hole of the plate member to form a bonding member of a predetermined shape; An insert molding step of inserting a joining member to mold a resin member on the outer peripheral side of the joining member; and a shaft member press-fitting step of pushing a shaft member into the hole of the joining member on which the resin member is molded. A method for manufacturing a driving force transmitting member, comprising: