JP3155338B2 - Drive transmission mechanism of image forming apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive transmission mechanism for an image forming apparatus such as a copying machine or a printer.

[0002]

2. Description of the Related Art When transmitting the driving force of an image forming apparatus, if a gear is used, an increase in load torque or noise may be a problem, so that a timing belt or the like is often used.

FIG. 4 shows a first conventional example, in which a driven pulley 1 and a tensioner 2 are provided near a frame 3, and a driving pulley 5 is screwed to a motor shaft 4a as shown in FIG. A motor 4 is mounted via a bracket 6 with the motor shaft 4 a facing the frame 3, and a timing belt 7 is wound around the driven pulley 1, the tensioner 2, and the driven pulley 5.

[0006] FIG. 6 shows a second conventional example (the same parts as those in the conventional example are denoted by the same reference numerals).
Side of the motor shaft 4
a, the driven pulley 5 is screwed, and the driven pulley 1 and the tensioner 2 are provided at a position separated from the frame 3 in accordance with the driven pulley 5. It is wound.

[0005]

In the above-mentioned first conventional example, the motor 4 is located before the timing belt 7, so that the motor 4 can be installed at an assembly line or at the time of maintenance.
The motor 4 hinders the winding of the timing belt 7.

Further, in the second conventional example, the timing belt 7 is located in front of the motor 4 so that the winding of the timing belt 7 is easy. However, since the shaft of the driven pulley 1 is long, the tension of the timing belt 7 is increased. As a result, there is a concern that the load torque may increase due to the occurrence of a fall, so that it is often necessary to newly provide a bracket for supporting the shaft near the driven pulley 1.

[0007] Both of these problems are factors that increase costs, and must be solved in today's strict demand for cost reduction.

Accordingly, it is an object of the present invention to provide a drive transmission mechanism of an image forming apparatus which is easy to assemble without increasing the cost.

[0009]

According to the first aspect of the present invention, a drive transmission of an image forming apparatus for transmitting rotation of a main vehicle connected to a motor shaft of a motor mounted on a frame via a bracket to a driven vehicle. in mechanism, the support shaft is provided by positioning the motor shaft on the same axis, the main driving wheel
A shaft hole rotatably fitted to the support shaft, and the same as the shaft hole.
Forming an axially formed odd-shaped hole, and
Slidable in the axial direction and fixedly fitted in the rotating direction in the irregular shaped hole
And a rotatable fitting that is rotatably fitted to the support shaft.
Move the motor shaft to the main vehicle in the rotational direction only by moving in the axial direction.
The bracket is fixedly connected to the bracket, and a notch for seeing through a connecting portion between the motor shaft and the driving vehicle is provided.

According to the second aspect of the present invention, the motor has an opening formed at a position corresponding to the notch of the bracket.

According to the third aspect of the present invention, a motor mounting surface which is separated from the frame surface by a predetermined distance is formed on a bracket mounted on the frame from which the support shaft is projected, and the motor shaft is formed on the motor mounting surface. The motor was installed.

According to the fourth aspect of the present invention, the support shaft is provided with a flange for fixing the movement of the driving vehicle in the axial direction.

[0013]

According to the first aspect of the present invention, the main vehicle is rotatably mounted on the support shaft positioned on the same axis as the motor shaft, and the motor shaft is rotatably mounted on the main vehicle so as to be movable in the axial direction. Since the endless belt is connected in a fixed direction, for example, when an endless belt is used for rotation transmission, the endless belt may be wound around a main driving vehicle and a driven vehicle, and then a motor may be attached. In addition, a notch for see-through is provided in the motor mounting bracket, and when connecting the motor shaft to the driving vehicle, the connecting portion can be easily checked by the operator, so that the alignment of the shaft center is easy and the assembling time can be reduced. .

According to the second aspect of the present invention, since the opening is formed at a position corresponding to the notch of the bracket of the motor, the connecting portion can be easily confirmed by the operator when connecting the motor shaft to the main vehicle. Axis alignment is easy and assembly time can be reduced.

According to the third aspect of the present invention, the driven vehicle can be located close to the frame, and the shaft of the driven vehicle can be shortened when the shaft of the driven vehicle is mounted on the frame. This can prevent the load torque from increasing.

According to the fourth aspect of the invention, since the movement of the driving vehicle in the axial direction is fixed by the support shaft, the driving vehicle is not pulled out even if the motor shaft is pulled out during maintenance. It is easy to assemble and easy to attach and detach the matching motor.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. The same parts as those shown in the above-mentioned conventional example are denoted by the same reference numerals. This embodiment is applied to a cassette bank section in an image forming apparatus. here,
As shown in FIG. 1, a driven pulley 1 serving as a driven vehicle and a driven pulley 8 serving as a driven vehicle connected to a transport roller (not shown) are positioned close to the frame 3 with their respective shafts supported by the frame 3. And a timing belt 7 as an endless belt is wound around the driven pulley 1 and the driven pulley 8. Further, the motor 10 with the control board is connected to the motor shaft 1 via a gate-shaped bracket 9 having a motor mounting surface 9a separated from the surface of the frame 3 by a predetermined distance.
0a is inserted into the driving pulley 8 and attached to the frame 3. Further, the tension is applied to the timing belt 7 by the tensioner 2.

The driving pulley 8 has a shaft hole 8a and a D-shaped irregular hole 8b formed from the frame 3 side as shown in FIG. Further, the distal end of the motor shaft 10a of the motor 10 is formed as a D-shaped deformed rod 10b similar to the deformed hole 8b so as to be inserted into the deformed hole 8b of the driving pulley 8. In addition, the gate-shaped bracket 9 is provided with a window 9b serving as a notch so that a tip of the motor shaft 10a inserted into the driving pulley 8 can be confirmed by an operator,
The motor 10 has its control board 10c shifted downward so as to open the window 9b.

In such a configuration, at the time of assembly on an assembly line, the driving pulley 8 is attached to the frame 3 together with the driven pulley 1 by the support shaft 11 in advance.
It is sufficient to wind the timing belt 7 around the driving pulley 8 and the driven pulley 1 and then attach the motor 10, and assembly is easy. When the motor 10 is mounted, the distal end of the motor shaft 10a is inserted into the driving pulley 8, but the operation can be performed while checking the insertion portion from the window 9b provided in the bracket 9, so that the shaft centering and the deformed rod 10b are deformed. The angle adjustment of the hole 8b is easy and the work can be performed smoothly.

Further, since the driven pulley 1 is arranged at a position close to the frame 3, the shaft of the driven pulley 1 does not tilt and the load torque does not increase.

Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those described in the above embodiment are denoted by the same reference numerals. In this embodiment, a support shaft 12 with a flange 12a is provided instead of the support shaft 11. The driving pulley 8 is attached to the support shaft 12 so as to be freely rotatable and fixed to move in the axial direction.

In such a configuration, even when the motor 10 is detached and the tip of the motor shaft 10a is pulled out at the time of maintenance or the like, the driving pulley 8 is not pulled out and the assembling is simple as described in the above embodiment. In addition, the motor 10 can be easily attached and detached.

[0023]

According to the first aspect of the present invention, the main drive vehicle is rotatably mounted on the support shaft positioned on the same axis as the motor shaft, and the motor shaft is freely movable in the axial direction on the main drive vehicle. For example, when the endless belt is used for rotation transmission, the endless belt can be wound around the main driving vehicle and the driven vehicle, and then the motor can be attached. Furthermore, the motor mounting bracket is provided with a notch for see-through, so that when connecting the motor shaft to the driving vehicle, the connecting portion can be easily confirmed by the operator, and the alignment of the shaft center is easy and the assembly time can be reduced. it can. With such a simple configuration, it is possible to improve the assemblability on the assembly line and the serviceability in the market without increasing the cost.

According to the second aspect of the present invention, since the opening is formed at a position corresponding to the notch of the bracket of the motor, the connecting portion can be easily confirmed by the operator when connecting the motor shaft to the main vehicle. The shaft center can be easily adjusted, and the assembling time can be reduced.

According to the third aspect of the present invention, the driven vehicle can be positioned close to the frame, and the shaft of the driven vehicle can be shortened when the shaft of the driven vehicle is mounted on the frame. Therefore, it is possible to prevent the load torque from increasing.

According to the fourth aspect of the present invention, since the movement of the driving vehicle in the axial direction is fixed by the supporting shaft, the driving vehicle is not pulled out even if the motor shaft is pulled out during maintenance. It is easy to assemble and easy to attach and detach the matching motor.

[Brief description of the drawings]

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

FIG. 2 is an exploded plan sectional view showing a relationship between a driving pulley and a support shaft.

FIG. 3 is an exploded plan sectional view showing a relationship between a driving pulley and a support shaft according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing a first conventional example.

FIG. 5 is a perspective view showing screwing of a driving vehicle.

FIG. 6 is a perspective view showing a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 driven vehicle 3 frame 8 main driven vehicle 9 bracket 9a motor mounting surface 9b notch 10 motor 10a motor shaft 11 support shaft 12 support shaft 12a flange

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16H ⁷ /00-7/24 F16H 53/00-55/56 F16H 57/02 521 G03G 15/00 550-556

Claims (4)

(57) [Claims] 1. A drive transmission mechanism of an image forming apparatus for transmitting rotation of a driving vehicle connected to a motor shaft of a motor mounted on a frame via a bracket to a driven vehicle, wherein the driving transmission mechanism is disposed on the same axis as the motor shaft. the support shaft is provided by positioning the front
A shaft hole rotatably fitted to the support shaft in the driving vehicle and
Forming a shaft hole and a modified hole formed coaxially;
Axle is freely slidable in the axial direction and fixed in the rotation direction
The specially shaped rod is fitted to the support shaft rotatably.
The motor shaft is rotated only by moving the motor shaft in the axial direction.
A drive transmission mechanism for an image forming apparatus, wherein the bracket is fixedly connected in a rolling direction, and a cutout portion for seeing through a connection portion between the motor shaft and the driving vehicle is provided in the bracket. 2. A motor having an opening formed at a position corresponding to a notch of a bracket.
A drive transmission mechanism for the image forming apparatus according to any one of the preceding claims. 3. A bracket attached to a frame from which a support shaft protrudes is provided with a motor mounting surface separated by a predetermined distance from the frame surface, and the motor is mounted on the motor mounting surface with the motor shaft being on the frame side. The drive transmission mechanism for an image forming apparatus according to claim 1, wherein: 4. The drive transmission mechanism for an image forming apparatus according to claim 1, wherein a flange for fixing movement of the driving vehicle in the axial direction is formed on the support shaft.