JPH0733229Y2 - Optical system drive for image forming apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to an optical system driving device for an image forming apparatus such as a copying machine, and more particularly to improving the workability of assembling a moving wire in the device. .

(2) Related Art Generally, an image forming apparatus such as a copying machine is provided with an optical system including an illumination unit, a unit for accommodating a right-angle mirror (hereinafter referred to as a mirror unit), and scans each unit. The original is scanned and exposed by being moved. The drive of each unit is performed by using a moving wire, a drive pulley, and the like. That is, the moving wire is fixed to the frame of the lighting unit, and the moving wire is wound around the pulley attached to the mirror unit. The moving wire is wound around a drive pulley connected to a drive system via an idle pulley or the like, and by rotating the drive pulley, each unit is moved at a predetermined speed ratio via the moving wire. Move to scan.

(3) Problems to be Solved by the Invention As described above, since the driving of the optical system is performed via the moving wire wound around each pulley, when the optical system is assembled, the moving wire may be wound or A step for fixing or the like is required. When winding the moving wire, it is necessary to pay attention to the winding direction in relation to other members, but it is easy to make a mistake in the winding direction during the assembling work. In addition, in the winding step during the assembling work, if the work procedure of finally winding around the drive pulley is taken, it is necessary to loosen the attachment end portion of the moving wire to the main body frame. Further, since the moving wire is composed of a twisted piano wire, it has high elasticity, and when it is wound around the drive pulley during assembly, it is wound around the drive pulley and then wound. In addition, there is a problem in that workability is extremely poor because the subsequent work must be performed while holding or pulling the moving wire by hand.

The present invention has been made in view of the above points, and an object thereof is to obtain an optical system driving device of an image forming apparatus capable of improving the workability of assembling (winding) a moving wire.

(4) Means for Solving the Problems An optical system driving device of an image forming apparatus of the present invention is an optical system driving device for scanning an optical system of an image forming apparatus,
A moving wire attached to a moving member of the optical system and a drive pulley around which the moving wire is wound, and the moving wire is wound around the driving pulley so as to temporarily fix the both. The wire fixing member can be removably attached, and the wire fixing member is attached to the drive pulley so that the moving wire is pressed and fixed.

(5) Action In this invention, since the moving wire can be temporarily and easily fixed while being wound around the drive pulley, the moving wire is first wound around the driving pulley in the moving wire winding step during assembly work. It is possible to fix them in this state, and then wrap both ends of the moving wire around each pulley in that state, or fix them to the fixing portion of each unit for assembly.

(6) Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows a sectional structure of a copying machine to which the present invention is applied.
First, the structure of the entire copying machine will be briefly described.
A document table 2 on which a document is placed is provided above the copying machine body 1, and an optical system 30 for scanning and exposing the document is provided below the document table 2. A photoconductor drum 4 is provided in the center of the copying machine body 1, and a corona discharger 5 for main charging, a developing device 6, a corona discharger 7 for transfer, and a cleaning device 8 are arranged around the photoconductor drum 4. Has been done.

The optical system 30 includes a lighting unit 31 having a light source 31a and a first mirror 31b, a mirror unit 32 having a second mirror 32a and a third mirror 32b, a transmissive projection lens 33, and a fixed fourth mirror 34. Have

Next, the drive device for the optical system will be described with reference to FIG.
The illumination unit 31 and the mirror unit 32 of the optical system,
The drive pulleys 10a and 10b are driven by the drive wires 11a and 11b wound around the drive pulleys 10a and 10b, and the drive pulleys 10a and 10b are connected by a drive shaft 12. The frame of the lighting unit 31 is provided with fixing members 13a and 13b for fixing the moving wires 11a and 11b, respectively, and the frame of the mirror unit 32 is wound with the moving wires 11a and 11b. Outer pulleys 14a and 14b and inner pulleys 15a and 15b are rotatably mounted. Further, the first idle pulley 16a around which the moving wires 11a and 11b are wound is provided between the drive pulleys 10a and 10b and each unit.
, 16b and second idle pulleys 17a, 17b are rotatably provided on a body frame (not shown). And
One ends of the moving wires 11a and 11b are connected to biasing members 18a and 18b such as springs attached to the main body frame, and the other ends are connected to fixing members 19a and 19b.

FIG. 1 shows the details of the drive pulleys 10a and 10b. (A) shows the wire fixing member 23 on the drive pulleys 10a and 10b.
FIG. 3B is a sectional view taken along the axial direction of the drive pulleys 10a and 10b in the case where the
It is the figure seen from the upper surface and side surface of 23. FIG. 2 shows the moving wires 11a and 11b fitted in the drive pulleys 10a and 10b.
FIG. 8 is a perspective view of a wire fixing member 23 for temporarily fixing the wire.
Since both drive pulleys 10a and 10b have the same structure, only the drive pulley 10a will be described below. As shown in FIG. 1, the drive pulley 10a is fixed to the drive shaft 12 with a screw 20. A part of the moving wire 11a is always fixed to the drive pulley 10a by a wire fixing screw 21. Further, on the side surface of the drive pulley 10a, the recess 2
2, 22 are formed, and by fitting the claw portions 24, 24 of the wire fixing member 23 into the recesses 22, 22, the drive pulley 10
The moving wire 11a wound around a can be temporarily fixed in the wound state.

As shown in FIG. 2, the wire fixing member 23 includes the claw portions 24, 2
4.There are photographing parts 25, 25, and when the photographing parts 25, 25 are picked with a finger, the wire fixing member 23 is formed of an elastic material such as resin or rubber. 24 will open outwards. A pressure contact member 26 made of an elastic material such as rubber or sponge is attached to the wire fixing member 23 so that the moving wire 11a can be pressed against and fixed thereto. If the material of the wire fixing member 23 is rubber or a resin having a large elasticity, the pressing member 26 does not need to be particularly attached and the wire fixing member may directly press the moving wire.
Further, if the gap between the wire fixing member 23 and the drive pulley 10a is smaller than the wire diameter of the moving wire 11a, the moving wire 11a can be pressed and fixed without the pressing member 26.

When the wire fixing member 23 is detached from the drive pulley 10a, the wire fixing member 23 is formed of an elastic material, so that the wire fixing member 23 can be fixed by pinching the photographing portions 25, 25 of the wire fixing member 23 with a finger. The claw portions 24, 24 of the member 23 are disengaged from the recesses 22, 22 of the drive pulley 10a, and the wire fixing member 23
Can be removed from the drive pulley 10a.

Next, the winding state of the moving wire will be described while explaining the method of assembling the optical system driving device. In addition, the movement wire is wound around both ends of each unit (front and rear direction in FIG. 4).
Since both are the same, only one side will be described below. First, a part of the moving wire 11a is fixed to the drive pulley 10a fixed to the drive shaft 12 with a screw 21. Next, the moving wire 11a is wound around the drive pulley 10a according to the moving distance (including a margin) of the illumination unit 31 (the state shown in FIG. 1), and the wire fixing member 23 and The moving wire 11a is temporarily fixed to the drive pulley 10a using the recesses 22, 22 of the drive pulley 10a (hereinafter,
The state shown in FIG. 1 (a) is referred to as a drive pulley unit).

The drive pulley unit is attached to the body frame, and both ends of the moving wire 11a are stretched. That is, as shown by the solid line arrow in FIG. 4, one end side of the moving wire 11a is connected to the first idle pulley 16a → the inner pulley 1 of the mirror unit 32.
5a → The biasing member 18a is passed over in that order. On the other hand, the other end side of the moving wire 11a is first hung on the second idle pulley 17a and then temporarily fixed to the frame body of the lighting unit 31 by the fixing member 13a, as indicated by a broken line arrow in the figure. . Then, the fixed moving wire 11a is further hung on the outer pulley 14a of the mirror unit 32, and finally fixed to the main body frame by the fixing member 19a.

By such a work procedure, the winding process of the moving wires 11a and 11b is completed, but in the case of actually using the copying machine, the wire fixing member 23 fitted in the recesses 22, 22 of the drive pulleys 10a and 10b. Is removed.

In this way, by moving the moving wires 11a and 11b to the respective pulleys, the lighting unit 31 and the mirror unit
32 and 32 can be scanned and moved at a speed ratio of 2: 1 by applying the principle of the pulley.

In this embodiment, since the moving wire can be temporarily fixed while being wound around the drive pulley, these can be made into subunits, and it is not necessary to consider the winding direction at the time of assembling work. When the moving wire is wound around the pulley or the like, it is not necessary to fix the moving wire and the drive pulley by hand or the like. Therefore, the winding process of the moving wire during the assembling work becomes very easy. Further, in the conventional copying machine or the like, some unit locking means was required so as not to move the lighting unit or the like at the time of shipping, but in this embodiment, the wire fixing member 23 is used.
By keeping the attached state, it is possible to prohibit the movement of the illumination unit and the like, and the special unit locking means as in the prior art becomes unnecessary.

FIG. 5 is a view showing another embodiment of the wire fixing member 23. Since the shape of the photographing portion 25 'is different from that of the wire fixing member 23 of FIG. 2, the same effect as the embodiment of the present invention can be obtained.

(7) Effect of the Invention As described above, by attaching the wire fixing member to the drive pulley, both can be temporarily fixed while the movement wire is wound around the drive pulley. This has the effect of facilitating the wire winding work.

[Brief description of drawings]

FIG. 1 (a) is a sectional view of a driving pulley applied to an optical system driving device of an image forming apparatus according to an embodiment of the present invention,
1 (b) is a plan view thereof, FIG. 1 (c) is a side view thereof, FIG. 2 is a perspective view of a wire fixing member according to an embodiment of the present invention, and FIG. 3 is an application of the present invention. FIG. 4 is an overall perspective view of a copying machine, FIG. 4 is an overall perspective view of an optical system driving device, and FIG. 5 is a perspective view of a wire fixing member showing another embodiment of the present invention. 10a, 10b ...... Drive pulley 11a, 11b ...... Moving wire 12 ...... Drive shaft 22 ...... Recess 23 ...... Wire fixing member 24 ...... Claw 25 ...... Shooting part 26 ...... Press contact member

Claims (1)

[Scope of utility model registration request] 1. An optical system driving device for scanning an optical system of an image forming apparatus, comprising: a moving wire attached to a moving member of the optical system; and a drive pulley around which the moving wire is wound. The drive pulley can be detachably attached with a wire fixing member for temporarily fixing the two in a state where the moving wire is wound, and by attaching the wire fixing member to the drive pulley, An optical system driving device for an image forming apparatus, which is configured to press and fix a moving wire.