JPH066363Y2 - Drive transmission device for copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> In the present invention, a photoconductor device and a developing device are detachably attached to a copying machine body, and a photoconductor driving gear and a developing driving gear are connected to a copying machine body from a driving source. The present invention relates to the improvement of the drive transmission device of the electrostatic transfer type copying machine which is arranged so as to sequentially transmit the power of 1., and can be utilized in, for example, a laser printer.

<Prior Art> Generally, in an electrostatic transfer type copying machine, light emitted from an exposure lamp to an original is received on a photoconductor to form an electrostatic latent image, and toner is attached from a developing device adjacent to the photoconductor. A visible image is formed on the photoconductor, and this is transferred to a transfer paper. Therefore, a rotation driving mechanism for the photoconductor and a rotation driving mechanism for the developing roller of the developing device are required. These driving forces are transmitted from the driving source of the main body of the copying machine to the photoconductor driving gear and the developing driving gear.

In addition, the photoconductor is required to be replaced because its photoconductor surface deteriorates after a predetermined number of transfer operations. The developing device also needs replacement because the toner deteriorates. Therefore, the photosensitive device and the developing device are detachably attached to the main body of the copying machine.

When only the developing device is operated without mounting the photosensitive device,
Toner may be scattered in the main body of the copying machine.

Therefore, conventionally, the presence or absence of the photosensitive device is detected by a micro switch or the like to control the driving.

<Problems to be Solved by the Invention> However, detecting the presence or absence of the photosensitive device by an electric signal may cause malfunction, and reliable mechanical control has been desired.

In view of the above, the present invention is to provide a drive transmission device that can mechanically detect the presence or absence of a photosensitive device and control the drive of the photosensitive device and the developing device.

<Means for Solving Problems> In the means for solving problems according to the present invention, as shown in FIGS. 1 and 2, the photosensitive device 2 and the developing device 3 are separately and detachably mounted on the copying machine main body 1, and In the copying machine in which the photoconductor drive gear 16 and the development drive gear 18 are arranged in the copier body 1 so that the power from the drive source 8 is sequentially transmitted through a plurality of gears, the photoconductor drive gear 16 is The support shaft 20 of the copying machine body 1 is movably fitted in a power transmission posture 21A and a transmission cancellation posture 21B in the axial direction, and the photosensitive member drive gear 16 is moved from the power transmission posture 21A to the transmission cancellation posture 21B. A spring 22 for urging is provided, and an engaging portion 23 that is integrally rotatably engaged with the photosensitive device 2 is projectingly formed on the tip end side of the support shaft 20 of the photosensitive device drive gear 16, and the photosensitive device 2 is provided. Photoconductor drive gear 16, a center hole 28 that fits with the support shaft 20 and an engaged hole 29 that engages with the engaging portion 23 are formed, and mesh with the photoconductor drive gear 16 and the gear 16. Gears 15,1
7, the outer edges of the facing surfaces are chamfered.

<Operation> In the above problem solving means, the power of the drive motor 8 is
It is sequentially transmitted to the photoconductor drive gear 16 and the developing drive gear 18 via the idle gear 15. When the photoconductor device 2 is not mounted, the photoconductor drive gear 16 is biased by the spring 22 to be in the transmission releasing posture 21B, so that the photoconductor drive gear 16 disengages from the idle gears 15 and 17, The drive force of the drive motor 8 is not transmitted to the photoconductor drive gear 16.

In this state, even if the developing device 3 is mounted, the developing drive gear 18
Since the power is not transmitted to the developing device 3, the developing device 3 does not operate and toner scattering is prevented.

Next, the central hole 2 of the photoconductor 25 is mounted so that the photosensitive device 2 is mounted.
8 is inserted into the support shaft 20, the engaging portion 2 is inserted into the engaged hole 29.
3, the photoconductor 25 is engaged with the photoconductor drive gear 16 so as to be integrally rotatable. Then, the photoconductor drive gear 16 is pushed to switch from the transmission release posture 21B to the power transmission posture 21A on the support shaft 20 against the spring 22, and meshes with the idle gears 15 and 17. At this time, the photoconductor drive gear 1
Since the outer edges of 6 and the idle gears 15 and 17 are chamfered, they mesh smoothly and it is possible to prevent tooth damage due to poor meshing of the gears.

Then, the driving force of the drive motor 8 is equal to that of the idle gear 1.
5 is transmitted to the developing drive gear 18 via the photoconductor drive gear 16 and the developing drive gear 18 rotates, so that the developing device 3
Is driven.

Therefore, it is possible to mechanically detect whether or not the photosensitive device is mounted, and there is no fear of malfunction as compared with the case where electrical detection is performed using a micro switch or the like, and reliable control is possible.

Moreover, since a member relating to drive transmission is not formed to project on the photosensitive device, damage and deformation due to contact with other members during transportation cannot occur, and reliable drive transmission can be achieved.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan sectional view showing a drive transmission device according to an embodiment of the present invention in a state in which a photosensitive device is not mounted, and FIG. 2 is a plan sectional view showing a state in which the drive transmission device is mounted in a photosensitive device.
FIG. 4 is an overall cross-sectional view of the copying machine, FIG. 4 is a front view showing the drive gear connection state of the copying machine, and FIG. 5 is a perspective view showing the back surface of the photosensitive device and the developing device.

In the copying machine of this embodiment, as shown in FIG. 3, the photosensitive device 2 and the developing device 3 are detachably mounted on the copying machine main body 1, and the transfer paper is supplied to the photosensitive device 2 below the photosensitive device 2. Sheet feeding device 4 and a transfer section 5 disposed below the photosensitive device 2.
And a fixing device 6 arranged on the paper discharge side from the transfer section 5, and a paper discharge tray 7 arranged on the paper discharge side of the fixing device 6.

Then, the drive transmission device is, as shown in FIG.
Power of a plurality of gear trains 10, 11, 12, 13, 14, 15, 16, 17, supported on the rear plate 9 of the copying machine body 1.
18 is transmitted. Of these, the photoconductor drive gear 16
Are arranged closer to the drive motor 8 than the developing drive gear 18.

Then, as shown in FIGS.
Is fitted to the support shaft 20 of the copying machine main body 1 so as to be switchable between a power transmission posture 21A and a transmission cancellation posture 21B in the axial direction, and the photoconductor drive gear 16 is moved to the power transmission posture 21A.
Is provided with a spring 22 for urging from the transmission release posture 21B side, and an engaging portion 23 that engages with the photosensitive device 2 so as to rotate integrally with the tip end side of the support shaft 20 of the photosensitive member drive gear 16.
Are formed. The outer edge of the surface of the photoconductor drive gear 16 that faces the idle gears 15 and 17 is chamfered. Correspondingly, the outer edges of the surfaces of the idle gears 15 and 17 facing the photoconductor drive gear 16 are also chamfered.

The power transmission posture 21A of the photoconductor drive gear 16 is set to the second
As shown in the figure, the photoconductor drive gear 16 and the idle gears 15 and 17 on both sides thereof are in mesh with each other. Further, the transmission releasing posture 21B of the photoconductor drive gear 16 is a state where the photoconductor drive gear 16 and the idle gears 15 and 17 on both sides thereof are disengaged as shown in FIG.

The spring 22 is a coil-shaped compression spring, and includes a rear plate 9
And the photoconductor drive gear 16. The photoconductor drive gear 16 is provided on the side of the photoconductor 25 of the support shaft 20.
The retaining member 24 is fixed. The pin as the engaging portion 23 is formed on the outer peripheral portion of the photoconductor drive gear 16.

On the other hand, as shown in FIG.
The charging device 26 and the cleaning device 27 are unitized. The photoconductor 25 is, as shown in FIGS.
A center hole 28 for fitting the support shaft 20 is formed at the center of rotation, and the photoconductor drive gear 1 of the photoconductor 25 is formed.
An engaged hole 29 that engages with the engaging portion 23 in a disengageable manner is formed on a surface facing the member 6. Further, a photoconductor positioning stopper 31 is provided on the front plate 30 of the copying machine body 1.

The developing drive gear 18 is connected to the photoconductor drive gear 16 via an idle gear 17, and a plurality of engaging projections 32 are formed on the front surface of the developing drive gear 18, and the projections 32 are developed. It is releasably engaged with an engaged hole 36 of a connecting cylinder 35 that rotates integrally with the rotary shaft 34 of the developing roller 33 of the apparatus 3.

As shown in FIG. 3, the developing device 3 includes a developing tank 37 and a toner replenishing tank 38. The developing roller 33 and the stirring roller 39 are rotatably supported by the developing tank 37, and the toner replenishing tank 38 is supplied with a supplying roller. 40 and a stirrer 41 are arranged.

In the above structure, the power of the drive motor 8 is sequentially transmitted to the photoconductor drive gear 16 and the developing drive gear 18 via the idle gear 15. When the photosensitive device 2 is not installed,
Since the photoconductor drive gear 16 is biased by the spring 22 to be in the transmission releasing posture 21B, the photoconductor drive gear 16 is disengaged from the idle gears 15 and 17, and the photoconductor drive gear 16 has the drive motor 8 Is not transmitted.

In this state, even if the developing device 3 is mounted, the developing drive gear 18
Since the power is not transmitted to the developing device 3, the developing device 3 does not operate and toner scattering is prevented.

Next, the central hole 2 of the photoconductor 25 is mounted so that the photosensitive device 2 is mounted.
8 is inserted into the support shaft 20, the photoconductor drive gear 16 is pushed to move the support shaft 20 against the spring 22 against the transmission releasing posture 2
The gear 1B is switched to the power transmission posture 21A and meshes with the idle gears 15 and 17. Then, the driving force of the drive motor 8 is transmitted from the idle gear 15 to the developing drive gear 18 via the photoconductor driving gear 16, and the developing drive gear 18 rotates, so that the developing device 3 is driven.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, the engaging portion 23 may use a magnet instead of the pin as in the above embodiment. Further, as the spring 22, a leaf spring may be used instead of the coil spring as in the above embodiment.

<Advantages of Device> As is apparent from the above description, according to the present invention, when the photosensitive device is not mounted, the photosensitive member drive gear is biased by the spring to be in the transmission canceling position. The driving force of the drive motor is not transmitted to the gear, and in this state, even if the developing device is mounted, the developing device does not operate and toner scattering is prevented. When the photosensitive device is mounted, the photosensitive member driving gear is pushed to switch the transmission shaft from the transmission canceling position to the power transmitting position against the spring on the support shaft, and the driving force of the drive motor changes from the idle gear to the photosensitive member driving gear. After that, it is transmitted to the developing drive gear, the developing drive gear rotates, and the developing device is driven.

Therefore, it is possible to mechanically detect whether or not the photosensitive device is mounted, and there is no fear of malfunction as compared with the case where electrical detection is performed using a micro switch or the like, and reliable control is possible.

Moreover, since the member relating to drive transmission is not formed to project on the photosensitive device, damage and deformation due to contact with other members during transportation cannot occur, and reliable drive transmission can be achieved.

Further, since the photoconductor drive gear and the gear that meshes with the photoconductor are chamfered, it is possible to prevent tooth damage due to poor meshing of the gears when the photoconductor device is mounted.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing a drive transmission device according to an embodiment of the present invention in a state in which a photosensitive device is not mounted, FIG. FIG. 4 is an overall cross-sectional view of the copying machine, FIG. 4 is a front view showing the drive gear connection state of the copying machine, and FIG. 5 is a perspective view showing the back surface of the photosensitive device and the developing device. 1: Copier body, 2: Photosensitive device, 3: Developing device, 8: Driving source, 16: Photoconductor driving gear, 18: Development driving gear, 2
0: support shaft, 21B: transmission release posture, 21A: power transmission posture, 22: spring, 23: engaging part.

Claims (1)

[Scope of utility model registration request] 1. A photoconductor device and a developing device are detachably attached to a main body of a copying machine, respectively, and a photoconductor drive gear and a development drive gear are attached to the main body of the copier via a plurality of gears. In the copying machine arranged so as to be sequentially transmitted, the photoconductor drive gear is fitted to the support shaft of the copying machine main body so as to be switchable between a power transmission posture and a transmission canceling posture in the axial direction thereof. A spring is provided for urging the body drive gear from the power transmission posture to the transmission release posture, and the engaging portion that engages with the photosensitive device so as to rotate integrally with the photosensitive device is provided at the tip of the support shaft of the photosensitive body drive gear. A center hole that fits with the support shaft and an engaged hole that engages with the engagement portion are formed on a surface of the photosensitive device facing the photoconductor drive gear. Faces of the gears that mesh with each other Driving device for a copying machine, characterized in that the outer edge is chamfered.