JPH0548569U - Gear mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] The support shaft of the driven gear that meshes with the drive gear directly connected to the drive motor is fixed to the gear frame with a simple structure. [Structure] The support shaft 15 having a flange portion 26 is inserted into the gear frame 12 from the back side, and the gear frame 1
The front surface of the drive motor 6 mounted on the rear surface of the flange 2
The support shaft 15 is fixed to the gear frame 12 by abutting on the gear shaft 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gear mechanism used for a drive mechanism of a printer device or the like.

[0002]

[Prior Art]

 At present, a gear mechanism in which a drive motor is combined with a gear train is generally used as a drive mechanism for a movable part such as a platen roller of a printer.

Therefore, a conventional example of such a gear mechanism will be described with reference to FIG. First, in the gear mechanism 1, a driven gear 4 is rotatably supported by a support shaft 3 provided on the front surface of a flat plate-shaped gear frame 2, and a drive gear 5 meshing with the driven gear 4 is supported. It is mounted on the drive shaft 7 of the drive motor 6. Here, the drive motor 6 is fixed to the rear surface of the gear frame 2 by a screw (not shown) which is a fixing mechanism, and the drive motor 6 is provided in a drive shaft hole 8 penetrating the front and rear surfaces of the gear frame 2. The drive shaft 7 of the drive motor 6 is inserted. Further, in the gear mechanism 1, the support shaft 3 is fixed by caulking after being inserted into a support shaft hole 9 penetrating the front and rear surfaces of the gear frame 2, and an E-ring 10 is attached to the tip portion thereof. As a result, the driven gear 4 is rotatably held. In this gear mechanism 1, the drive motor 6 is actually fixed to the gear frame 2 with a screw (not shown) or the like, and the gear frame 2 is screwed to a main body frame (not shown). It is designed to be fixed with (not shown) or the like.

In such a structure, in the gear mechanism 1, the driven gear 4 is rotatably supported by the support shaft 3 provided in the vicinity of the drive shaft 7 of the drive motor 6 so that the drive motor 6 can rotate. The driving force is transmitted from the driving gear 5 to another place via the driven gear 4.

[0005]

In the gear mechanism 1 described above, the driving force of the drive motor 6 can be transmitted from the drive gear 5 to another place via the driven gear 4.

Here, in the gear mechanism 1 described above, the support shaft 3 that pivotally supports the driven gear 4 is mounted on the gear frame 2 by caulking, but such caulking requires a dedicated tool. Since the work is complicated, the productivity of the gear mechanism 1 is reduced.

[0007]

[Means for Solving the Problems]

 A drive shaft in which a drive gear that meshes with the driven gear is attached to the drive shaft by forming a flange portion that abuts the rear surface of the gear frame on the support shaft that rotatably supports the driven gear through the gear frame from the rear. A fixing mechanism for fixedly arranging the motor on the rear surface of the gear frame is provided, and a stopper portion, which comes into contact with the front surface of the drive motor opposed to the gear frame by the fixing mechanism, penetrates the gear frame. Formed on the supporting shaft.

[0008]

[Action]

 Since the support shaft can be fixed to the gear frame manually without the need for a special tool, the productivity of the gear mechanism can be improved.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. First, the gear mechanism 11 is connected to a platen roller (not shown) as a part of a printer device (not shown), for example.

In the gear mechanism 11, as shown in FIG. 1, a pair of gear frames 12 and 13 facing each other are integrally formed to form a gear box 14, and the gear box 14 has a gear. The gears 4 and 5 are located between the frames 12 and 13. Therefore, in the gear mechanism 11, the driven gear 4 is rotatably supported by the support shaft 15 mounted between the gear frames 12 and 13, and the drive gear 5 meshing with the driven gear 4 is the gear frame. It is mounted on the drive shaft 7 of the drive motor 6 that penetrates through the 12 drive shaft holes 16.

In this gear mechanism 11, the drive motor 6 has a cylindrical main body 17 and two triangular flange portions 18 integrally formed on the outer periphery of the front surface thereof. As illustrated in FIG. 3, an arcuate support portion 19 that rotatably supports the main body 17 of the drive motor 6 and a recess portion that engages with the flange portion 18 of the drive motor 6 in a detachable manner are formed. The holder portion 20 is formed integrally with the rear surface of the gear frame 12. In the gear mechanism 11, as shown in FIG. 4, the drive motor 6 is engaged with the rear surface of the gear frame 12 by engaging the main body 17 and the flange portion 18 with the support portion 19 and the holder portion 20 as described above. By fixing the gear box 14 mounted on the main body frame 21 with the screw 22, the flange portion 18 in the holder portion 20 is held in position on the main body frame 21, and the drive motor 6 is moved to the gear box 14. It is designed to be fixed to. That is, in the gear mechanism 11, the fixing mechanism 23 for fixing the drive motor 6 to the rear surface of the gear frame 12 includes the flange portion 18, the support portion 19, the holder portion 20, the main body frame 21, and the screw. 22 and the like.

Further, in the gear mechanism 11, the support shaft 15 has a flange portion 26 integrally formed at the end thereof, and the support shaft 15 is sequentially inserted into the support shaft holes 24 and 25 formed in the gear frames 12 and 13, respectively. ing. In the gear mechanism 11, the drive motor 6 is mounted on the gear box 14 as described above in a state where the flange portion 26 formed at the end of the support shaft 15 is in contact with the rear surface of the gear frame 12. As a result, the front surface of the drive motor 6 is brought into contact with the flange portion 26, which also serves as a stopper portion, so that the support shaft 15 is fixed between the gear frames 12 and 13.

In such a structure, in the gear mechanism 11, the driven gear 4 is rotatably supported by the support shaft 15 provided in the vicinity of the drive shaft 7 of the drive motor 6, so that the drive motor 6 is driven. The driving force is transmitted from the driving gear 5 to another place via the driven gear 4.

Here, in the gear mechanism 11, the support shaft 15 that rotatably supports the driven gear 4 as described above is inserted into the support shaft holes 24 and 25 of the gear frames 12 and 13, and the end flanges are inserted. The portion 26 is fixed in the gear box 14 by being positioned and held on the rear surface of the gear frame 12 by the front surface of the drive motor 6, and since this fixing is realized manually without requiring a special tool or the like. Good productivity. Moreover, in the gear mechanism 11, since the tip end portion of the support shaft 15 projectingly provided on the front surface of the gear frame 12 is inserted into the support shaft hole 25 of the gear frame 13 as described above, the support shaft 15 is not supported. The position of 15 is firmly held, and the driven gear 4 is rotatably held without requiring an E ring or the like.

Further, in the gear mechanism 11, as described above, the drive motor 6 can be manually attached to the gear box 14 that is attached to the main body frame 21 with the screw 22 without using a tool, so that productivity is improved. Is very good. Here, the mounting process of such a drive motor 6 will be described in detail below with reference to FIG. First, as illustrated in FIG. 1A, the main body 17 of the drive motor 6 is set so that the flange portion 18 of the drive motor 6 is positioned within the gap between the support portion 19 of the gear frame 12 and the holder portion 20. 12 is inserted into the support portion 19, and the drive motor 6 is rotated in this state to engage the flange portion 18 with the holder portion 20. Then, as illustrated in FIG. 2B, the gear box 14 to which the drive motor 6 is detachably mounted in this way is fixed to the main body frame 21 with the screw 22, so that the flange in the holder portion 20 is The drive motor 6 is fixed to the gear box 14 by holding the portion 18 on the main body frame 21. By doing so, in the gear mechanism 11, the drive motor 6 can be attached to the gear box 14 very easily.

In the gear mechanism 11 of the present embodiment, the tip end of the support shaft 15 projecting from the gear frame 12 is held by the gear frame 13, but the present invention is not limited to the above structure. Alternatively, for example, it is possible to form a large-diameter disk-shaped flange portion 26 at the end of the support shaft 15 and omit the gear frame 13. Further, the front side in the present invention means the direction in which the drive shaft 7 projects from the drive motor 6, and does not limit the actual use direction of the device or the arrangement direction of various parts.

[0017]

[Effect of the device]

 As described above, the present invention forms a flange portion that abuts the rear surface of the gear frame on the support shaft that rotatably supports the driven gear by penetrating the gear frame from the rear side, and drives the mesh with the driven gear. A fixing mechanism for fixedly disposing a drive motor, in which a gear is mounted on a drive shaft, on a rear surface of the gear frame is provided, and a stopper with which the front surface of the drive motor opposed to the gear frame abuts by the fixing mechanism. By forming the part on the support shaft that penetrates the gear frame, it is possible to fix the support shaft to the gear frame manually without the need for a dedicated tool, etc., so that the productivity of the gear mechanism is improved. It has the effect of being able to contribute to.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view observed from the rear.

FIG. 3 is a plan view showing a gear box.

FIG. 4 is a rear view showing the step of mounting the drive motor on the gear box.

FIG. 5 is an exploded perspective view showing a conventional example.

[Explanation of symbols]

 4 Driven Gear 5 Drive Gear 6 Drive Motor 7 Drive Shaft 11 Gear Mechanism 12 Gear Frame 15 Support Shaft 16 Drive Shaft Hole 23 Fixing Mechanism 24 Support Shaft Hole 26 Flange and Stopper

Claims (1)

[Scope of utility model registration request] 1. A flange portion that abuts a rear surface of the gear frame is formed on a support shaft that pierces a gear frame from the rear and rotatably supports a driven gear, and a drive gear that meshes with the driven gear is a drive shaft. A fixing mechanism for fixedly arranging the drive motor mounted on the rear surface of the gear frame in a fixedly opposed manner, and a stopper portion with which the front surface of the drive motor opposed to the gear frame abuts by the fixing mechanism. A gear mechanism, characterized in that it is formed on the support shaft that penetrates through.