JP2595249Y2 - Gear mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear mechanism in which gears provided on a plurality of members are meshed in an appropriate state.

[0002]

2. Description of the Related Art Conventionally, in a process of assembling an apparatus such as an electronic device, meshing between gears provided on a plurality of members has been performed by moving and adjusting members having fixed gears. FIG. 4 is a plan view showing a conventional gear meshing state, and FIG. 5 is a front view showing a conventional gear meshing state.

In FIGS. 4 and 5, a gear 4 is rotatably provided on a shaft 3a of a stud 3 attached to a main body 2 of the apparatus 1. Further, a motor bracket 6 is fixed to the main body 2 with a screw 5, and the motor bracket 6 can be moved by loosening the screw 5. A motor 7 is fixed to the motor bracket 6, and a motor gear 9 is provided on a shaft 7 a of the motor 7. A stud 10 is further attached to the motor bracket 6, and a gear 11 is provided on a shaft portion 10 a of the stud 10. The gear 4, the gear 11, and the motor gear 9 are in mesh with each other in this order, that is, the gear 11 transmits the rotation of the motor 7 to the gear 4.

Next, the mounting operation of the gears 4 and 11 will be described with reference to FIGS.
A description will be given based on FIG. After attaching the stud 3 provided with the gear 4 to the main body 2 in both figures, the motor bracket 6 to which the motor 7 is fixed is fixed to the main body 2 with the screw 5.
At this time, the meshing between the gear 11 and the gear 4 for transmitting the rotation of the motor 7 is adjusted based on a previously determined design value,
The position of the motor bracket 6 is determined.

[0005] In the case of meshing the gear teeth, the amount of meshing such that the play (backlash) between the tooth surfaces generated when the teeth of one gear and the teeth of the other gear mesh with each other is appropriate, and the other tooth is adjusted. The size of the gap created by the peak of one tooth and the valley of the other tooth when meshing with the other tooth is given in advance as a design value, and the backlash is directly measured based on this design value. It is engaged.

Then, the screw 5 is loosened, and the motor bracket 6 is adjusted and moved in the direction of the arrow AB in the figure based on the design value to engage the gear 4 and the gear 11 in an appropriate state, thereby positioning the motor bracket 6. The rear screw 5 is tightened to complete the mounting.

[0007]

However, in the above adjusting method, when the amount of meshing of the gear teeth or the gap formed between the peak of one tooth and the valley of the other tooth is very small, precise adjustment of the meshing is required. Adjustment is difficult and time-consuming, resulting in a problem that adjustment workability deteriorates.

According to the present invention, in order to eliminate the above-mentioned problems, the two gears are accurately engaged by bridging a link having a hole into which each shaft is fitted between the shafts of the meshing gears. It is another object of the present invention to provide a gear mechanism excellent in adjustment workability for positioning the shafts of both gears and for positioning a bracket to which one of the gears is fixed.

[0009]

In order to solve the above-mentioned problems, the present invention comprises a main body, a first gear fixed to the main body, a second gear meshing with the first gear, and a second gear. A third gear meshing with the gear, a bracket for fixing the second gear and the third gear, fixing means for fixing the bracket to the main body, and a shaft of the first gear inserted into one end and the other end And a link for fitting the shaft of the second gear into the second gear and holding the engagement between the first gear and the second gear in an appropriate state, and the bracket has a degree of freedom of attachment to the fixing means. It is.

[0010]

The shaft of the first gear is fitted to one end of the link, and the shaft of the second gear is fitted to the other end of the link. As a result, both shafts are positioned, and the teeth of the first and second gears are properly engaged with each other. Further, the mounting position of the bracket with respect to the main body is determined by positioning the shafts of the first and second gears. Thereafter, the bracket is fixed to the main body by the fixing means.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. Elements common to the drawings are assigned the same reference numerals. FIG. 1 is a plan view showing the meshing of the gears according to the embodiment of the present invention, and FIG. 2 is a front view showing the meshing of the gears of the embodiment. FIG. 3 is a perspective view showing the link of this embodiment.

Referring to FIGS. 1, 2 and 3, a link 21 is provided between the shaft 3a and the shaft 10a of the apparatus 20 according to the present embodiment. As shown in FIG. 2
Individual holes 21a and 21b are formed. These holes 2
The distance L between 1a and 21b is made with high precision, and when the shaft portions 3a and 10a of the gear 4 and the gear 11 are fitted into the holes 21a and 21b, the engagement of the gears 4 and 11 is in an appropriate state. It has become a distance. Therefore, in the state shown in FIGS. 1 and 2, the gears 4 and 11 mesh with each other in an appropriate state. Other structures are the same as in the related art.

Next, the operation in mounting the gears 4 and 11 will be described. First, the stud 3 of the shaft portion 3 a on which the gear 4 is rotatably provided is attached to the main body 2. Next, motor bracket 6
A motor gear 9 is provided on a shaft 7a of a motor 7 fixed to
Further, the motor gear 9 is engaged with the gear 11 provided on the shaft portion 10a of the stud 10 attached to the motor bracket 6.

The shaft portions 3a, 10a of the gears 4, 11
Are fitted into the two holes 21a and 21b of the link 21, respectively. The shaft portions 3a and 10a are provided with holes 21a and 21b.
, The gears 4 and 11 are accurately engaged with each other in an appropriate state, and the shaft 3a is positioned.
The motor bracket 6 is also positioned by positioning the shaft portion 3a. Thereafter, when the motor bracket 6 is fixed to the main body 2 with the screw 5, the state shown in FIGS. 1 and 2 is obtained.

[0015]

As described in detail above, according to the present invention, the shaft of the first gear is fitted at one end and the shaft of the second gear is fitted at the other end, and the first gear is A link for maintaining the engagement with the second gear in an appropriate state, a bracket to which the second gear and the third gear are fixed and having a degree of freedom of attachment to the main body, and a fixing for fixing the bracket to the main body With the provision of the means, the adjustment operation based on the design value in the meshing of the gears becomes unnecessary, and the positioning of the bracket can be performed. As a result, the work time required for assembling the device is reduced. The link also functions as a shaft reinforcing member that prevents the gear shaft from tilting due to the deflection of the motor bracket during use of the device.

[Brief description of the drawings]

FIG. 1 is a plan view showing gear engagement of an embodiment of the present invention.

FIG. 2 is a front view showing the meshing of the gears of the embodiment.

FIG. 3 is a perspective view showing a link according to one embodiment.

FIG. 4 is a plan view showing a meshing state of a conventional gear.

FIG. 5 is a front view showing a meshing state of a conventional gear.

[Explanation of symbols]

 2 Body 3a Shaft 4 Gear 6 Motor bracket 10a Shaft 11 Gear 21 Link

Claims (1)

(57) [Scope of request for utility model registration] A first gear fixed to the main body; a second gear meshing with the first gear; a third gear meshing with the second gear; A bracket for fixing the gear and the third gear; fixing means for fixing the bracket to the main body; a shaft of the first gear is fitted at one end and a shaft of the second gear at the other end. And a link for maintaining the engagement between the first gear and the second gear in an appropriate state, wherein the bracket has a degree of freedom of attachment to the fixing means. Gear mechanism.