JPH0721290B2 - Drive transmission device such as recording device - Google Patents

Description

The present invention relates to a drive transmission device used in a recording apparatus such as an electrophotographic copying apparatus.

[Prior art and its problems]

Generally, a recording device, such as an electrophotographic copying device, can be attached and detached in order to inspect and replace parts as necessary.
In addition, the driven member such as an image carrier and a developing brush, which is adapted to rotate by receiving a rotational force from the driving member in the mounted state, is provided.

However, in such a conventional one, the drive transmission device does not smoothly engage when the driven member or the driving member is mounted, and it is necessary to rotate the driven member or the driving member by hand to engage them. There are cases in which a member that constitutes the drive transmission device is damaged.

In order to avoid these inconveniences, there are drive transmission devices in which the driven member can be easily mounted, but these have the problem that the torque that can be transmitted from the drive member to the driven member is small.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a drive transmission device which eliminates the above-mentioned problems of the conventional device and which can easily mount a driving member or a driven member and which transmits a large torque.

[Means for solving problems]

According to the present invention, in a drive device for transmitting a rotational force from a drive member to a driven member, an engagement member is provided on either the drive member or the driven member, and the other is loosely fitted to the engagement member in the axial direction. Can be mounted in a state of being engaged, and after mounting, engages with the engaging member in the rotation direction by rotating relative to the engaging member, and is held at a predetermined position by the urging force of the urging member when disengaged. In addition, a transmission member having a projecting piece that can move in the axial direction against the biasing force of the biasing member when pressed from the axial direction by the engaging member during mounting is provided. ing.

[Action]

According to the present invention, by adopting the above-mentioned means, the protrusion of the transmission member is loosely fitted in the engaging member from the axial direction, and the engaging member is rotated relative to the engaging member. The transmission members are engaged with each other in the rotational direction, and the two members are integrally connected so that torque can be transmitted. On the other hand, when the protrusion of the transmission member comes into contact with the engagement member and is pressed in the axial direction during mounting, the protrusion of the transmission member moves in the axial direction against the biasing force of the biasing member, and Bending and damage of one side are prevented. Then, by rotating the transmission member relative to the engagement member from this state, both members are brought into a normal engagement state and are integrally connected.

〔Example〕

 Embodiments of the present invention shown in the drawings will be described below.

An embodiment of the present invention is shown in FIGS. 1 to 7. First, the case of use in a general electrophotographic copying apparatus will be described. As shown in FIG. Is provided with a document placing table 11 and a platen cover 12 capable of opening and covering the upper surface thereof, and a sheet feeding cassette 13 on which sheets are stacked is detachably provided at a lower part of one side of the main body 10. A paper discharge tray 14 is provided on the lower part of the other side.

On the other hand, inside the main body 10, an exposure device 16 including a lens, a mirror and the like for irradiating the original on the original placing table 11 with light and guiding the reflected light to the photosensitive drum 15 which is an image carrier. (A portion surrounded by a broken line) is provided, a charging device 17 facing the photosensitive drum 15 is provided in the vicinity of the upper side of the photosensitive drum 15, and a developing device is provided ahead of the charging device 17 in the rotation direction of the photosensitive drum 15. The device 18, the transfer electrode 19, the separation electrode 20, and the cleaning device 21 are sequentially arranged on the photosensitive drum 15 respectively.
Are arranged so as to approach and face each other.

Further, a paper feed roller 22 that can come into contact with the uppermost one of the paper bundles in the paper feed cassette 13 is provided,
A pair of upper and lower re-feeding rollers 23 are provided in the paper transport area up to the photoconductor drum 15, and a transport device 24 and a fixing device are provided in the paper transport area from the photoconductor drum 15 to the paper discharge tray 14. Each device 25 is provided.

Then, when using the one configured as described above, first, after placing the original on the upper surface of the original placing table 11 is covered with the platen cover 12, and after operating the operation panel, When the copying operation is started, the image of the original is transferred by the exposure device 16 to the surface of the photoconductor drum 15 charged by the charging device 17, and the photoconductor drum 15 is transferred.
An electrostatic latent image corresponding to the original image is formed on the upper surface of 15.

After that, it is developed by the developing device 18, is transferred to the paper which is located at the uppermost position in the paper feed cassette 13 by the transfer pole 19 and is conveyed by the paper feed roller 22 and the paper feed roller 23, and the separation pole 20
Are separated by the fixing device 25 after being fixed by the fixing device 25 via the conveying device 24, and then discharged to the paper discharge tray 14.
The photoconductor drum 15 is cleaned by the cleaning device 21, one step is completed, and it stands by until the next copying operation.

The electrophotographic copying apparatus configured as described above is the first
The drive transmission device shown in FIGS. 6 to 6 is used, and the rotational force is transmitted from the drive member to the driven member, for example, the photosensitive drum 15.

As shown in FIGS. 1 (a) and 1 (b), a coupling 31 fixed to a shaft 30 of a motor (not shown) is provided with two protrusions 31A for transmitting the rotational force, and the coupling 31 is engaged. The diameter of the coupling 31, which is a member, is slightly smaller than the inner diameter of the tubular portion 37 of the gear 32 fixed to the photoconductor drum 15, and is large enough to be inserted into the tubular portion 37.

The coupling claw 33, which is a transmission member that engages with the protrusion 31A of the coupling 31, is formed of steel or the like having an annular shape as shown in FIG. 2, and two pieces 34 are integrally provided on the central axis side. A spring 35, which is an urging member for moving the coupling claw 33 in a direction opposite to the rotation direction of the coupling 31, is provided at one end of these pieces 34, and the other end is a protrusion that engages with the protrusion 31A. The piece 34A is formed by bending.

Since the spring 35 for moving the coupling pawl 33 is attached to the gear 32 while being inclined as shown in FIG. 1 (a), the coupling pawl 33 is always shown in the right direction in FIG. 1 and in FIG. When the projection 31A of the coupling 31 is not engaged, the projection 34A is held by the spring 35 while being in contact with one end of the hole 36, as shown in FIG. Therefore, the coupling claw 33 is prevented from rotating further in the direction opposite to the rotation direction during drive transmission.

When the gear 32 and the coupling claw 33 as described above are provided on the shaft of the photosensitive drum 15, the photosensitive drum 15
Since the projection 31A of the coupling 31 is located at the position shown in FIG. 4 when the is mounted on the main body 10 of the electrophotographic copying apparatus, the photosensitive drum 15 can be mounted smoothly.
When the coupling 31 is rotated about half way by the motor, the protrusion
31A engages with the projecting piece 34A of the coupling claw 33, and the coupling claw 33 rotates integrally against the urging force of the spring 35, but when the projecting piece 34A comes into contact with the other end of the hole 36, the gear Protrusion 3 against 32
The further rotation of 4A stops, and thereafter, the gear 32 rotates together with the gear 32. Then, this rotational force is transmitted to the photoconductor drum 15 to rotate it.

Unlike FIG. 4, when the tip end portion of the protrusion 31A is mounted at a position where it abuts the protrusion 34A, the protrusion 31A causes the protrusion 34A to move.
However, since the spring 35 attached to the coupling claw 33 extends to the left in FIG. 1, the protrusion 34A escapes and a large force does not act on the protrusion 31A and the protrusion 34A.

Then, in this case, since the projection 31A and the projection piece 34A are only in contact with each other, the rotational force of the coupling 31 is not transmitted, but when rotated a little, the tip of the projection 31A and the projection piece 34A come out of contact. Transition to the state shown in FIG.
Is returned to the initial state by the spring 35, and thereafter, the protrusion 31A and the protrusion 34A are engaged with each other in the same manner as described above, the rotational force of the coupling 31 is transmitted to the coupling claw 33, and thus the photoconductor drum 15 is rotated. Transmitted.

As is clear from the above description, since no force other than the biasing force of the spring 35 is applied to the protrusion 34A provided on the coupling claw 33 when the photosensitive drum 15 is not mounted, the protrusion 34A is not attached. Even if 34A and the protrusion 31A come into contact with each other, the protrusion 34A is
It is possible to prevent a situation in which the protrusion 34A is deformed without a large force being applied to both sides by escaping due to the extension of the protrusion.

Therefore, the photoconductor drum 15 and the main body 10 can be easily attached and detached regardless of the positions of the protrusion 34A and the protrusion 31A. Further, if the protrusion 34A is formed of a material having a high shape and strength, it is possible to transmit even a large torque, and since the mechanism is simple, it can be manufactured easily and inexpensively.

In the above-described embodiment, the case where the two protrusions 34A and the protrusions 31A are provided has been described. However, the same effect as in the above-described embodiment can be obtained when both of them are provided one by one or two or more. Further, in the above-described embodiment, the attachment / detachment of the photoconductor drum 15 is described as an example, but needless to say, the present invention can be applied to other drive transmission devices that require attachment / detachment.

〔The invention's effect〕

Since the present invention is configured as described above, the driven member (photoreceptor drum or the like) is attached to the drive member (motor or the like) either by the engaging member provided on the driven member or the drive member. By mounting the protrusion of the transmission member provided on the other side in a loosely fitted state and rotating relative to the engagement member, the transmission member and the engagement member engage in the rotational direction and are integrally connected. The torque can be transmitted. Also, when the projection of the transmission member comes into contact with the engagement member during mounting,
Since the transmission member moves in the axial direction against the urging force of the urging member, it is possible to prevent the protrusion of the transmission member from being bent or damaged. That is, the urging force of the urging member may be set smaller than the load at which the projecting piece bends or breaks. Therefore, if the transmission member is attached to the engagement member so that the axis of the transmission member coincides with the axis of the engagement member,
Regardless of the angle of the transmission member with respect to the engagement member, both members can be brought into a normal engagement state, and the transmission member (driven member) can be easily attached to and detached from the engagement member (driving member). You can do it. Further, since the engagement member and the transmission member are engaged with each other in the rotational direction, the engagement state of both members can be perfected, whereby the rotational force of the driving member is applied to the driven member. In addition to being transmitted without difficulty, it is possible to sufficiently cope with a large load on the driven member. Further, it has an excellent effect that it is easy to manufacture because of its simple structure and that it can be provided at a low cost.

[Brief description of drawings]

1 (a) and (b) are explanatory views showing an embodiment of the present invention, and FIG. 2 is a view taken along the line AA of FIG. 1 (a).
3 and 4 are views showing the positional relationship between the projecting piece and the projection, FIG. 5 is a cross-sectional view of FIG. 3, and FIG. 6 shows the positional relationship between the projecting piece and the projection when rotating. FIG. 7 and FIG. 7 are schematic views of the electrophotographic copying apparatus. 10 …… Main body 11 …… Original platen 12 …… Platen cover 13 …… Paper feeding cassette 14 …… Paper ejection tray 15 …… Photosensitive drum 16 …… Exposure device 17 …… Charging device 18 …… Developing device 19… … Transfer pole 20 …… Separator pole 21 …… Cleaning device 22 …… Feeding roller 23 …… Refeeding roller 24 …… Conveying device 25 …… Fixing device 30 …… Axis 31 …… Coupling 31A …… Protrusion 32 ...... Gear 33 …… Coupling pawl 34 …… Side 34A …… Projection piece 35 …… Spring 36 …… Hole 37 …… Cylindrical part

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-60-188627 (JP, A) JP-A-58-24154 (JP, A) JP-A-62-113915 (JP, A) Actual development Sho-55- 14195 (JP, U)

Claims (1)

[Claims] 1. A drive device for transmitting a rotational force from a drive member to a driven member, wherein one of the drive member and the driven member is provided with an engagement member, and the other is provided with the engagement member from the axial direction. It can be mounted in a loosely fitted state, is engaged with the engaging member in the rotation direction by rotating relative to the engaging member after mounting, and has a predetermined position by the urging force of the urging member at the time of disengagement. And a transmission member having a protrusion capable of moving in the axial direction against the urging force of the urging member when pressed by the engaging member from the axial direction during mounting. A drive transmission device such as a recording device.