JPH05306740A - Drive transmitting mechanism of image forming device - Google Patents

Abstract

PURPOSE:To obtain the drive transmitting mechanism of an image forming device which can be easily assembled without raising its cost. CONSTITUTION:In the drive transmitting mechanism of an image forming device, the rotation of a main drive wheel 8 connected to the motor shaft 10a of a motor 10 attached to a frame 3 through a bracket 9 is transmitted to a driven wheel 1. A supporting shaft 11 is coaxially provided on the motor shaft 10a. The main drive wheel 8 is attached on the supporting shaft 11. The motor shaft 10a is fixed and connected to the main drive wheel 8 in the rotational direction so as to be axially moved freely, and a cutout portion 9a for seeing the connecting portion between the motor shaft 10a and the main drive wheel 8 through it is provided on the bracket 9.

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 For transmission of driving force of an image forming apparatus, a gear may often cause an increase in load torque and noise, and therefore 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 main driving pulley 5 is screwed to a motor shaft 4a as shown in FIG. The motor 4 is mounted via the bracket 6 with the motor shaft 4a on the frame 3 side, and the timing belt 7 is wound around the driven pulley 1, the tensioner 2, and the main driving pulley 5.

Next, what is shown in FIG. 6 is a second conventional example (the same parts as those in the above-mentioned conventional example are designated by the same reference numerals).
Mounted on the side of the motor shaft 4 as in the conventional example.
A driving pulley 5 is screwed to a, a driven pulley 1 and a tensioner 2 are provided at positions apart from the frame 3 in accordance with the driving pulley 5, and the timing belt 7 is attached to the driven pulley 1, the tensioner 2, and the driving pulley 5. It is wound.

[0005]

In the above-mentioned first conventional example, since the motor 4 is located in front of the timing belt 7, it is possible to install it on the assembly line or at the time of maintenance.
The motor 4 is in the way and interferes with the winding of the timing belt 7.

In the second conventional example, since the timing belt 7 is located in front of the motor 4, it is easy to wind the timing belt 7, but since the driven pulley 1 has a long shaft, the tension of the timing belt 7 is increased. In this case, there is a fear 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.

Since both of these problems are factors of cost increase, they must be solved in today's demand for cost reduction.

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

[0009]

According to a first aspect of the present invention, drive transmission of an image forming apparatus for transmitting rotation of a main driving wheel connected to a motor shaft of a motor mounted on a frame via a bracket to a driven vehicle. In the mechanism, a support shaft is provided on the same axis as the motor shaft, and the main drive wheel is rotatably attached to the support shaft, and the motor shaft is movable in the axial direction and rotatable in the rotation direction. The bracket was fixedly connected to the bracket, and a cutout portion was provided in the bracket for seeing through the connecting portion between the motor shaft and the prime mover.

According to the second aspect of the invention, the motor has an open portion formed at a position corresponding to the cutout portion of the bracket.

According to a third aspect of the present invention, a bracket for mounting the frame on which the support shaft is projected is provided with a motor mounting surface that is separated from the frame surface by a predetermined dimension, and the motor shaft is located on the frame side of the motor mounting surface. I installed a motor.

According to the fourth aspect of the invention, the support shaft is formed with a flange for fixing the axial movement of the driving wheel.

[0013]

According to the first aspect of the invention, the main drive wheel is rotatably mounted on a support shaft located on the same axis as the motor shaft, and the motor shaft is rotatably rotatable on the main drive wheel. Since the endless belts are fixedly connected in the direction, for example, when the endless belt is used for transmitting the rotation, the motor can be attached after winding the endless belt around the driving wheel and the driven wheel, and the assembly is easy. Further, the motor mounting bracket is provided with a cutout portion for see-through, and when the motor shaft is coupled to the driving vehicle, the coupling portion can be easily confirmed by the operator, so that the axial alignment can be easily performed and the assembling time can be shortened. ..

According to the second aspect of the present invention, since the open portion is formed at the position corresponding to the cutout portion of the bracket of the motor, the connecting portion can be easily confirmed by the operator when connecting the motor shaft to the driving vehicle. Aligning the axes is easy and assembly time can be shortened.

According to the third aspect of the present invention, the main drive wheel can be located close to the frame, and the shaft of the follower wheel can be shortened when the shaft of the follower wheel is attached to the frame. It is possible to prevent an increase in load torque due to.

According to the fourth aspect of the present invention, since the axial movement of the main drive vehicle is fixed by the support shaft, the main drive vehicle will not be pulled out even if the motor shaft is pulled out for maintenance. In addition to being easy to assemble, the motor can be easily attached and detached.

[0017]

DETAILED 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 conventional example are designated by the same reference numerals. The present 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 wheel and a driving pulley 8 serving as a driving wheel, which are connected to a conveyance roller (not shown), are located in positions close to the frame 3 with their shafts supported by the frame 3. The timing belt 7 as an endless belt is wound around the driven pulley 1 and the main driving pulley 8. Further, the motor 10 with a control board is connected to the motor shaft 1 via a gate-shaped bracket 9 having a motor mounting surface 9a spaced from the surface of the frame 3 by a predetermined dimension.
The tip of 0a is inserted into the driving pulley 8 and attached to the frame 3. The tension belt 2 applies tension to the timing belt 7.

As shown in FIG. 2, the drive pulley 8 has a shaft hole 8a and a D-shaped deformed hole 8b formed from the frame 3 side, and is supported by a support shaft 11. Further, the tip of the motor shaft 10a of the motor 10 is formed as a D-shaped deformed rod 10b like the deformed hole 8b so as to be inserted into the deformed hole 8b of the driving pulley 8. Further, the gate-shaped bracket 9 is provided with a window 9b serving as a notch so that the operator can confirm the tip of the motor shaft 10a inserted into the driving pulley 8.
The control board portion 10c of the motor 10 is shifted downward so as to open the window 9b.

In such a structure, during assembly on the assembly line, the main drive pulley 8 is attached to the frame 3 together with the driven pulley 1 by the support shaft 11 in advance.
The timing belt 7 may be wound around the main driving pulley 8 and the driven pulley 1 and then the motor 10 may be attached, whereby the assembly is easy. Further, when the motor 10 is attached, the tip of the motor shaft 10a is inserted into the main drive pulley 8. However, since it is possible to work while checking the insertion portion from the window 9b provided in the bracket 9, it is possible to align the center of the shaft and the deformed rod 10b. The angle of the hole 8b can be easily adjusted, and the work can be done 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 shown in the above-mentioned embodiment are designated by the same reference numerals. In this embodiment, instead of the support shaft 11, a support shaft 12 with a flange 12a is provided. The driving pulley 8 is attached to the support shaft 12 so as to be rotatable and fixed in the axial direction.

In such a structure, the main drive pulley 8 is not pulled out even if the motor 10 is detached and the tip of the motor shaft 10a is pulled out for maintenance or the like, and the assembly is easy 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 invention, the main drive wheel is rotatably attached to the support shaft positioned on the same axis as the motor shaft, and the motor shaft is movable in the main drive wheel in the axial direction. Since the endless belts are fixedly connected in the rotational direction by means of, for example, when the endless belts are used for rotation transmission, the endless belts can be wound around the main drive wheel and the driven wheel and then the motor can be attached to facilitate the assembly. Further, since the motor mounting bracket is provided with a cutout portion for see-through, when the motor shaft is coupled to the driving vehicle, the coupling portion can be easily confirmed by the operator, the axis alignment can be easily performed, and the assembling time can be shortened. it can. With such a simple structure, it is possible to improve the assemblability in the assembly line and the serviceability in the market without increasing the cost.

According to the second aspect of the present invention, since the open portion is formed at the position corresponding to the cutout portion of the bracket of the motor, the connecting portion can be easily confirmed by the operator when connecting the motor shaft to the driving vehicle. The axis alignment is easy and the assembly time can be shortened.

According to the third aspect of the present invention, the main drive wheel can be located close to the frame, and the shaft of the follower wheel can be shortened when the shaft of the follower wheel is attached to the frame. It is possible to prevent an increase in load torque due to.

According to the invention as set forth in claim 4, since the axial movement of the main drive vehicle is fixed by the support shaft, the main drive vehicle will not be pulled out even if the motor shaft is pulled out for maintenance. In addition to being easy to assemble, the motor can be easily attached and detached.

[Brief description of drawings]

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

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

FIG. 3 is a plan sectional view showing an exploded relation 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]

 1 Driven Vehicle 3 Frame 8 Drive Vehicle 9 Bracket 9a Motor Mounting Surface 9b Notch 10 Motor 10a Motor Shaft 11 Support Shaft 12 Support Shaft 12a Flange

Claims (4)

[Claims] 1. A drive transmission mechanism of an image forming apparatus for transmitting the rotation of a main driving wheel connected to a motor shaft of a motor mounted on a frame via a bracket to a driven vehicle,
The support shaft is provided so as to be positioned on the same axis as the motor shaft,
The main drive wheel is rotatably attached to the support shaft, and the motor shaft is movably axially fixed in the rotational direction and fixedly connected to the main drive wheel, and a cutout for seeing through a connecting portion between the motor shaft and the main drive wheel. A drive transmission mechanism for an image forming apparatus, wherein a portion is provided on the bracket. 2. A motor having an opening formed at a position corresponding to the notch of the bracket.
The drive transmission mechanism of the described image forming apparatus. 3. A bracket for mounting a frame having a support shaft protruding therefrom is provided with a motor mounting surface which is separated from the frame surface by a predetermined dimension, and a motor is mounted on the motor mounting surface with the motor shaft facing the frame. The drive transmission mechanism of the image forming apparatus according to claim 1. 4. A drive transmission mechanism for an image forming apparatus according to claim 1, wherein the support shaft is formed with a flange for fixing movement of the driving wheel in the axial direction.