JPH0628853Y2 - Optical system drive for image forming apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an optical system drive for horizontally moving an optical system composed of a light source and a mirror on the lower surface of a document table in an image forming apparatus such as a copying machine. Regarding the device.

(b) Conventional Technology In an image forming apparatus such as a copying machine, an image of a document is relatively scanned by light from a light source, and reflected light from the document is distributed to a photoconductor through a mirror and a lens. In general, an image forming apparatus of a medium-sized machine or higher has a document table fixed on the upper surface of the apparatus main body, and a light source and a mirror are configured to be horizontally movable on the lower surface of the document table. In order to faithfully read the image of the original and accurately form the electrostatic latent image on the surface of the photoconductor, the optical system composed of the light source and the mirror must be moved smoothly.

Therefore, in the conventional image forming apparatus, an optical system drive including a drive shaft to which the rotational force of the motor is transmitted, a plurality of pulleys including a drive shaft pulley attached to the drive shaft, and a wire wound around the plurality of pulleys. The device is used.
In this optical system driving device, a mirror base having a light source and a mirror is fixed to a part of the wire, and the wire is wound around the drive pulley or sent out from the drive shaft pulley by rotation of the drive shaft and the drive shaft pulley. The mirror base is fixed to a part of the wire that is leveled by another pulley, and moves in the horizontal direction together with the wire by the rotation of the pulley. Since the wire itself has elasticity, it absorbs the vibration generated in the transmission member or the like formed by the gear and the clutch located between the motor and the drive shaft. Further, since the wire makes line contact with the pulley and the contact surface of the pulley is formed into a smooth cylindrical shape, the mirror base smoothly moves horizontally on the lower surface of the document table.

Further, in the conventional image forming apparatus, in order to make the movement of the mirror base smoother, an optical system driving device is provided at both ends perpendicular to the moving direction of the mirror base, and the driving force is evenly transmitted to both ends of the mirror base. There are things I tried to do. In such an image forming apparatus, since the operations of both optical system driving devices are synchronized, each driving shaft pulley is connected by one driving shaft whose rotation axis length is equal to the distance between both optical system driving devices. Has been done.

(c) Problems to be solved by the invention When assembling the optical system driving device configured as described above in the image forming apparatus, after the pulleys are pivotally supported on the apparatus main body, the wires are hooked on the pulleys in order. I will hand it over. However,
In the case where the mirror base is provided with the optical system drive device at both ends, the drive shaft pulleys are fixed on both sides of the drive shaft and the wires are hung over, so that the drive shafts are provided between the opposite side surfaces of the respective drive shaft pulleys. If the wire exists around the drive shaft pulley, the wire must be held by sandwiching the drive shaft. In particular, in order to reliably transmit the driving force to the wire, it is necessary to wind the wire around the drive shaft pulley a plurality of times, and it is necessary to carry the wire from one hand to the other hand every time the wire goes around the drive shaft pulley. There is a drawback that the work of hanging the wire becomes complicated.

An object of the present invention is to allow a wire to be wound around the drive shaft pulley in a state where the drive shaft pulley is removed from the drive shaft during assembly work in the image forming apparatus, and to simplify the wire hanging work. To provide.

(d) Means for Solving the Problems An optical system driving device of an image forming apparatus of the present invention comprises a plurality of drive shafts connected to a motor via a transmission member and a drive shaft pulley attached to the drive shaft. In the optical system driving device of the image forming apparatus, which includes a pulley and a wire wound around the plurality of pulleys, and transmits the driving force in the horizontal direction to the optical system on the lower surface of the document table, the drive shaft pulley is It is characterized in that a drive shaft pulley supporting member pivotally supported on the frame and a drive shaft pulley attaching member for detachably attaching the drive shaft pulley to the drive shaft are provided.

(e) Action The drive shaft pulley is pivotally supported by the drive shaft pulley support member on the frame of the apparatus body. Further, the drive shaft pulley is detachably attached to the drive shaft by a drive shaft pulley attachment member. Therefore, the drive shaft pulley is rotatably supported on the apparatus main body side independently of the drive shaft, and the drive force is transmitted in a state of being attached to the drive shaft.

(f) Embodiment FIG. 3 is a schematic front sectional view of a copying machine having an optical system driving device according to an embodiment of the present invention.

A photoconductor drum 32 is rotatably provided in the center of the inside of the copying machine body 31, and constitutes a copy process unit 34 together with devices such as a developing device 33 on the outer peripheral portion thereof. A manual paper feed tray 35 and paper cassettes 36 and 37 are provided on one side surface of the copying machine body 31, and paper feed rollers 38 to
41 is provided, and the paper feeding unit 42 is configured. A paper discharge tray 46 is provided on the other side surface of the copying machine main body 31,
The paper discharge unit 48 is configured. A timing roller 43, a conveyance belt 44, and a fixing roller 45 are provided between the paper feed unit 42 and the copy process unit 34 to reach the paper ejection unit 48, and a paper conveyance path 47 is configured. On the upper surface of the copying machine body 31, a document table 4 made of hard transparent glass is used.
9 is formed. An optical system 11 including a light source 21, mirrors 22 to 25, and a lens 26 is provided on the lower surface of the original table 49. The light source 21 and the lens 22 are mounted on the first mirror base 28, and the mirrors 23 and 24 are mounted on the second mirror base 27. The mirror bases 27 and 28 reciprocate in the direction of arrow A or B on the lower surface of the document table 49. At this time, the second mirror base 27 moves at half the speed of the first mirror base 28. As a result, the light of the light source 21 scans the entire surface of the image of the document set on the document table 49, and the reflected light from the document is distributed to the photosensitive drum 32 as shown by the broken line in the figure.

FIG. 2 is a perspective view of the optical system driving device. Arrow A
Alternatively, optical system driving devices 20 and 20 'are provided at both ends of the first mirror base 28 and the second mirror base 27 that move in the B direction in the direction perpendicular to the moving direction. In the optical system drive device 20, the wire 2 is wound around the pulleys 9 to 31 and the drive shaft pulley 1. Each end of the wire 2 is fixed to the copying machine main body 31 side by an adjusting screw 14 and a stopper 15. Also,
The pulleys 10 to 13 are pivotally supported on the copying machine main body 31.
The pulley 9 is pivotally supported on the side surface of the second mirror base 27. A part of the horizontal portion of the wire 2 is fixed to the first mirror base 28 by the plate 8. The drive shaft pulley 1 is attached to the drive shaft 6 together with one drive shaft pulley 1 '. The optical system driving device 20 'has the same configuration as the optical system driving device 20.

With the above configuration, when the drive shaft pulley 1 rotates in the direction of arrow C, the rotation moves the wire 2, and the first mirror base 28 moves in the direction of arrow A. The second mirror base 27 moves in the direction of arrow A at a speed half that of the first mirror base 28.

FIG. 1 is a side sectional view showing a main part of the optical system driving device.

The drive shaft pulley 1 is axially supported by a bearing 4 provided on the frame of the copying machine main body 31 via a retaining ring 5. As a result, the drive shaft pulley 1 is rotatable with respect to the frame 3. Hole 1 provided at the center of drive shaft pulley 1
The inner diameter of a is substantially equal to the outer shape of the drive shaft 6. Further, the flange 1b of the drive shaft pulley 1 is provided with a screw hole 7, and the drive shaft 6 is also provided with a screw hole 6a. The drive shaft 6 is inserted into the hole portion 1a of the drive shaft pulley 1 as shown by the one-dot chain line in the figure, the screw hole 6a is aligned with the screw hole 7, and the both are screwed, so that the drive shaft 6 is attached to the drive shaft pulley 1. Can be fixed.

In the above, the bearing 4 and the retaining ring 5 constitute the drive pulley supporting member of the present invention, and the screw holes 6a, 7 and the screw 7 are provided.
Similarly, a constitutes a drive shaft pulley mounting member.

With the above configuration, when assembling the optical system drive device,
The drive shaft pulley 1 is supported by the frame 3 and the drive shaft 6 is pulled out from the hole 1a. At this time, the side surface of the drive shaft pulley 1 is opened, and there is no need to change the wire 2 when winding around the drive shaft pulley 1. After the wire-hanging work is completed, the drive shaft 6 is inserted into the hole portion 1a of the drive shaft pulley 1 and both are screwed with the screw 7a, whereby the drive force transmitted to the drive shaft 6 is transferred to the drive pulley 1 and the wire. Two
Can be told.

(g) Effect of the Invention According to this invention, since the drive shaft pulley can be pivotally supported on the main body of the device independently of the drive shaft, the wire of the drive shaft pulley can be opened with the side surface of the drive shaft pulley open. Can be carried over. Therefore, when the wire is wound around the drive shaft pulley, it is not necessary to change the wire and the assembly work of the optical system driving device including the hanging work can be performed very easily.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an essential part of an optical system driving device of an image forming apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of the optical system driving device, and FIG. 3 is the optical system driving device. 2 is a schematic front cross-sectional view of a copying machine that is an image forming apparatus including the above. DESCRIPTION OF SYMBOLS 1 ... Drive shaft pulley, 2 ... Wire, 4 ... Bearing, 5 ... Retaining ring, 6 ... Drive shaft, 7 ... Screw hole.

Claims (1)

[Scope of utility model registration request] 1. A manuscript comprising: a drive shaft connected to a motor via a transmission member; a plurality of pulleys including a drive shaft pulley attached to the drive shaft; and a wire wound around the plurality of pulleys. In an optical system driving device for an image forming apparatus that transmits a horizontal driving force to an optical system on the underside of a stand, a driving shaft pulley supporting member that pivotally supports the driving shaft pulley on a frame of the apparatus body, and a driving shaft pulley as a driving shaft. An optical system driving device for an image forming apparatus, comprising: a drive shaft pulley mounting member that is detachably mounted.