JPH0466927A - Method for exchanging optical drive motor - Google Patents

Abstract

PURPOSE:To easily exchange an optical drive motor with another motor by exchanging the motor after a driving pulley is fixed to a main body frame and releasing the direct coupling between the driving pulley and the drive motor in a state where optical driving wires are wound around each pulley. CONSTITUTION:Spacers 92 are put between the flange section of a driving pulley 75 and a main body frame 11 while a motor 27 is mounted after a running table 20 is retreated from the mounted position of the motor 74. Screw sections 93A are screwed in tapped holes 93 provided into the frame 11 through stay bolts 91 screwed in stopping holes 75A through the spacers 92. Then the motor 74 is removed after a set screw 95 and screws 74a are removed. The wire put around the motor 74 is maintained in the same state. A new drive motor 74 is fixed with the screws after the rotating shaft of the new motor 74 is put in the pulley 75 and the screw 95 is set and the bolts 91 and spacers 92 are removed. Thus the exchange of drive motors 74 is completed. When this method is used, repairing or exchange of the motor can be exchanged extremely easily when the motor becomes faulty.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides an improvement in the ability to simply, easily and accurately assemble the scanning optical system of an image forming apparatus and repair or replace the drive motor. Regarding.

[Conventional technology]

In an image forming apparatus, a single-side guide, single-side drive type scanning optical system has a linearity regulating guide and a wire drive mechanism arranged on one side, and a guide mechanism for maintaining horizontal movement on the other side.

This is because, compared to a drive system in which drive wires are provided approximately symmetrically on the left and right sides, as described in JP-A No. 58-37670, there is less variation that can occur due to the different extension of the wires. This makes accurate straight-line scanning possible. Such cases are described in Japanese Patent Application Laid-Open No. 53-87234, Japanese Patent Publication No. 1-45064, etc.

That is, according to Japanese Patent Application Laid-Open No. 53-87234 ζ, a mirror pulley attached to a second traveling base, a pulley fixed to the main body of the image forming apparatus, and a drive pulley connected to a drive motor fixed to the main body are wound. There is a rotated drive transmission wire,
Both ends of the wire are fixed to the main body C2, and a specific point in the middle of the wire is fixed to the first carriage. Note that Japanese Patent Publication No. 1-45064 is similar to Habokore, or the wire is connected endlessly after winding, and both ends are not fixed to the main body.

As a result, the scanning optical system is configured such that the amount of movement of the second traveling table on which at least the second mirror is mounted is one half of the amount of movement of the first traveling table on which the document irradiation light source and the first mirror are mounted. A system is formed.

Then, the moving distance, moving direction, and stopping position of each carriage are ensured to be straight and precise, and the accuracy of screen scanning at each magnification is also maintained. As the magnification variable means, there is a rear pass variable method described in Japanese Patent Application Laid-Open No. 61-56335.

However, ensuring the compactness of the image forming device! The fixed pulley is attached to the inner wall of the main body frame,
The drive motor is also installed inside the main frame, and the drive pulley connected to it is also installed inside the main frame. It is conceivable that the gap between each carriage and its end and the main body frame be made smaller by J.

[Invention or problem to be solved]

However, it is very difficult to assemble the drive wires in such a narrow space.

In order to solve these problems, first of all, the scanning optical system must maintain accurate and stable operation, and the image forming apparatus housing the scanning optical system must be made as compact as possible without increasing its size. It is necessary to easily and reliably assemble and adjust the drive system, such as winding and installing wires around each pulley while maintaining Iζ. Furthermore, even if the assembly and adjustment have been completed, if the drive motor malfunctions and requires repair or replacement, the wires must be unwound, the motor must be repaired, and the wires can be reassembled after that. Going through this process takes time and effort, and results in big losses. An object of the present invention is to provide a motor replacement method that solves these problems.

[Means to solve the problem]

This purpose is to connect a first carriage having an exposure light source and a first mirror, at least a second mirror and an E-roller 7 to the first carriage.
In a scanning optical system of an image forming apparatus in which a second traveling table runs at 1/2 the speed of the traveling table and runs parallel to the document surface, a mirror pulley provided on the second traveling table and a mirror pulley provided on the main body frame are used. Optical drive wires are wound around a plurality of fixed pulleys and a drive pulley that is releasably directly connected to the drive motor installed on the main body, and in this state, the drive pulleys are fixed to the main body frame, and the drive pulleys and This is achieved by an optical drive motor replacement method characterized in that the drive motor is replaced after the direct connection with the drive motor is released.

〔Example〕

First, a scanning optical system using an embodiment of the method of the present invention is
3(a) and 4(a) which are a top view of the figure, a front view of FIG. 2, a partially enlarged view of FIG. 2, and 3(b) and 4 which are side sectional views thereof This will be explained with reference to FIG. However, the present invention is not limited thereto.

A scanning optical system 10 is mounted on the main body frame 11 of the image forming apparatus l.
is stored.

That is, it is equipped with a lamp 24, a reflecting mirror 23, a slit 25, a first mirror 26, a first carriage 20 that runs in the same direction as the original on the platen glass 18, a second mirror, a third mirror, and a third mirror. A lens unit in which a lens barrel 41 is regulated by a second traveling table 30 that travels in the same direction at half the speed of the first traveling table and a rail 16 on a shelf part IS of the main body frame, and can be centered at a predetermined magnification position. 40, variable magnification means 50 regulated by rail 17 and equipped with a fourth mirror 56 and a fifth mirror 57;
The screen on the original platen 18 passes through a fixed sixth mirror 58 and is transferred to the photosensitive drum 6 which rotates at a constant speed ratio with respect to the first traveling table.
1 to form a latent image.

Base 7 frame 21 of the first traveling platform 20 and the second traveling platform 30
．． 31 is reinforced with ribs 34 and connected to the guide receiver portions 22, 32 . The roller 27.39 attached to the opposite side of the base frame 21.32 is slidable on the guide bar 13 attached to the frame 11 of the main body in the running direction. A first traveling platform 20 is placed in contact with the rail 14 fixed to the frame 11,
The horizontal position of the second traveling platform 30 is maintained.

Such drive transmission to the first traveling platform 20 and the second traveling platform 30 is performed as follows.

The installation is carried out by fitting a mirror pulley (hereinafter simply referred to as a pulley) 37 onto a rotating support shaft 38 installed in play 1-31A.
It is designed to be attached to the base frame 31 of the traveling platform 30. In addition, the fixed pulley 7172 is connected to the main body frame 11.
The motor 7 is fitted onto a rotation support shaft 73 attached to the inner wall surface of the main body frame, and is attached to the shelf 15 of the main body frame.
A drive pulley 75 is attached to a rotating shaft connected to 4.

A wire 76 is wound around these pulleys 37, 71, 72, and 75, and one end of the wire (j is fixed to a hook 78 of the main body frame 11, and the other end is fixed to a hook 77 of the main body frame 11).
It is fixed to the hook 79 via.

The first traveling base 20 is fixed to a predetermined location of the wire 76 via a stopper 28. In addition, a wire is wound around each fixed pulley at an angle of approximately 180 degrees, a driving boo 1j75 directly connected to the motor 74 is wound with a wire several times, and a wire is wound around the pulley 37 of the second traveling base 30 at a 78° angle. The wire having the end on the side and the wire having the end on the hook 79 side are wound 180 degrees in opposite directions.

The space where the wire 76 is wound and stretched is the inner wall surface of the main body frame 11 and the base frame 21 of each traveling platform.
．． 31, and minimizing the space between the two sides will greatly contribute to making the device more compact.

However, when the space is reduced in this way, the work of winding and fixing the drive wire 76 around each pulley becomes increasingly difficult and unstable.

Two means for solving such difficulties will now be described.

During the winding work of the wire 76, the guide/<-13, the first traveling base 20. The second traveling base 30 has been removed from the main body frame 11.

However, the first wire winding at the same time. The reference position of each second traveling platform is determined and can be accurately and easily identified by index marks or the like.

To attach the pulley 37 provided on the second traveling base 30, the plate 31A is removed from the traveling base 30, and as a means for not changing its reference position, a holding metal fitting 81 is fixed to the main body frame 11 with screws 85. There is. The position of the fixing hole 11B of this screw 85 is determined from the reference position of the pulley 37. On the other hand, the pulley 37 is attached to a plate 31A with a pulley rotation spindle 38 to form a pulley unit. It is designed to be installed. When the second traveling base is removed from the main body, the pulley 37 is attached to the plate 3.
1A remains as a unit, and the screw hole 31G of the plate 31A is connected to the holding metal fitting 81.
It is tightened with a screw 82 through a fixing hole 81B of the metal fitting, and accurate positioning is achieved by a pin hole 31E and a bottle-shaped protrusion 31E' connected thereto. Further, the holding fitting 81 is fixed to the main body frame 11 with screws 85 to complete positioning. A window 11A is provided in the frame 11 of the main body 7 to facilitate this work and the work of attaching the second carriage to be described later.

In this manner, the fixed boos IJ71, 72 are also attached to the inner surface of the main body frame 11 together with their rotational support shafts 73 in a state where the inside of the main body frame 11 is left wide open.

In order to install the shelf 15 in the main body frame 1, a pulley 75 connected to a motor 74 mounted on the surface is also set, and a wire 76 is wound and installed between each pulley, and both ends of the shelf 15 are attached to the inner wall of the main body frame 11. Fixed hook 78.7
It is multiplied by 9. At this time, a spring 77 is interposed on one of the hooks, for example, the hook 79 side.

After completing the winding and erection work of the wire 76 in this way, the first. The second traveling bases 20 and 30 are fitted into the kite bar 13 via the slide receivers 22 and 32, and the notches 19 at both ends of the main frame 11 are inserted into the kite bar 13.
After dropping it into the holder, it was positioned and fixed, and each traveling platform was slid to a predetermined reference position and flanted, and in that state, the holding bracket 81 was attached as shown in Fig. 3 (a) and (b). For installation, which is visible at the back of the escape hole 83 of the metal fitting 81, firmly connect the screw hole Mj of the frame 31 of the second traveling platform through the stop hole 31B of the plate 31A with the screw 3IC. At that time, the pin hole 3LD for positioning the frame 31 and the mounting plate 31A are fitted with the bottle-shaped protrusions 31D', and the frame 31 and the mounting plate 31A are fitted together.
The position of A is accurately determined, and the attachment of the second traveling base to the pulley 37 is completely completed. Moreover, the wire 76 is inserted and fixed in the clamping fitting 28 of the first traveling base at a predetermined position. In that state, the hiss 85 and 8 are removed from the holding fitting 81.
If the metal fitting 81 is removed by removing 2,
All wire hooks are installed and adjusted.

In order to secure the wire 76 using the fastening fitting 28, it is preferable that the main body frame 11 has a window (not shown).

In this way, the work of winding and installing the optical system drive wire can be easily and reliably performed in a narrow space.

However, if quite severe starting and stopping operations are repeated, the optical system driving motor 74 may fail.

In that case, the motor 74 may be damaged for repair or new replacement work.
Removal and installation work is involved. In that case, first, the wire clamp of the first traveling base 20 and the second traveling base 30 are
Remove the pulley 37, and then remove both running bases and guide bar 13.
, unwind the wire 76 , remove the motor 74 , and then re-wrap the wire 76 in the above-described manner for repair or new replacement.
Work must be done to install the 3rd class. This would require a lot of effort and time.

Therefore, in the present invention, in order to save such labor and time, a method as shown in FIG. 5 is used.

That is, the first traveling platform 20 is moved away from the installation position of the motor 74, and the spacer 9 is inserted between the flange of the drive pulley 75 and the main body frame 41 with the motor 74 attached.
2 and provided in the flange portion I, - Pass the stay port 91 through the spacer 92 and the threaded hole 93 provided in the body frame 11 through at least one fixing hole 75A, and tighten the threaded portion 93A for temporary fixing. Then, remove the setscrew 95 that fastens the rotating shaft of the motor 74 and the drive pulley 75, remove the screw 74A that fixes the motor 74 to the shelf 15, remove the motor 74, and repair it at another location. It becomes possible to carry out inspections. The state of the wound wire is maintained as it is.

After the repaired motor 74 or the new motor 74 has its rotating shaft fitted into the drive pulley 75 fixed to the main body frame 11 and set with the setscrew 95, the drive motor 74 is attached to the shelf 15 with the screw 74A. After fixing, the stay port 91 and spacer 92 are removed to complete the restoration to the steady state.

By adopting such a method, repair or replacement work of the motor in the event of a failure is greatly improved.

Now, in the embodiment shown in FIG. 5, the drive pulley 75 is temporarily fixed to the x-body 7 rem 11 by using a spacer 92 in the stay port 91. Next, a second embodiment is shown in FIG.

In this embodiment, the spacer 92 is not used and the stay port 96 is
and the nut 97 to connect the drive pulley 75 to the main body frame 1.
This is a method of temporarily fixing it to 1.

As shown in FIG. 6, the stay port 96 includes a threaded portion 96A at the base with a head and a stepped portion 9 at the middle stage with a smaller diameter than the threaded portion 96A at the base.
6B and an even smaller diameter tip threaded portion 96C.

If you strain it like this, the screw hole 93 of the main body frame 11
Screw the threaded part 96A of the stay port 96 into the stopper hole 75A of the clamp part of the drive pulley 75.
The pulley 75 can be temporarily fixed to the main body frame 11 by penetrating the pulley 75 and having the stepped portion 96B receive the pulley 75, and then fastening the napht 97 to the threaded portion 96. In this case, the spacer 92 shown in FIG. 5 becomes unnecessary. Instead, you will need Natsu 97.

Although it is possible to use one stay port in such a temporary fixing method, it is preferable to use two or more stay ports if possibleG).

In this way, the same effect as shown in FIG. 5 is obtained, and motor replacement becomes much easier and more accurate, and can be carried out in a very short time.

〔Effect of the invention〕

By the method of the present invention, the scanning optical system can be miniaturized, and even if the driving device is placed in a narrow space, the ease and accuracy of the assembly work will not be impaired. The repair and replacement work has also improved, making it possible to make the entire image forming apparatus compact, stable, and reliable.

[Brief explanation of drawings]

FIG. 1 is a plan view of a scanning optical system using a practical example of the method of the present invention. Figure 2 is its front view. 3(a) and 4(a) are partially enlarged views of FIG. 2. Figure 3 (b) and Figure 4 (b) are respectively shown in Figure 3 (a).
). Side sectional view of FIG. 4 Ca). 5 and 6 are side sectional views showing temporary fixing of the motor drive pulley to the main body frame. 1... Image forming apparatus 10... Scanning optical system II
...Body 7 frames IIA...Window 11B...
Stopper hole 13...Guide bar 14...Rail 15...Shelf section 16...Rail
18... Original table 20... First traveling table
21... Traveling base 7 frame 22... Guide support is part
27.39...Roller 28...Stopper
30... Second running platform 31... Running platform frame
31A...Mounting is done using plate 31G...screws
31D, 31E...pin holes 31D', 31E'
... Bottle-shaped projection 31G ... Threaded hole 35 ... Second mirror 37 ... Mirror pulley 38 ... Rotation shaft 41 ... Lens barrel 56 ... Fourth mirror 61 ... Photosensitive Body drum 73...Rotation shaft 75...-Drive pulley 76...Wires 78, 79...Hook 81B...Stopping hole 83...Escape hole 91.96...Stay bolt 93... ...Screw hole 96B...Stepped part 97...Nut 32...Guide receiver is part 36...Third mirror (branch) 40...Lens unit 50...Magnification adjustment means 57 ...Fifth mirror 71, 72...Fixed pulley 74...Motor 75A...Stopping hole 77...Spring 81...Holding fitting 82...Brew 85...Hiss 92... Spacer 96A... Root threaded part 96C... Tip threaded part

Claims (1)

[Claims] a first carriage having an exposure light source and a first mirror; and a 1/1/2 inch of the first carriage having at least a second mirror and a mirror pulley;
In a scanning optical system of an image forming apparatus in which a second traveling table runs at a speed of 2 and parallel to the document surface, a mirror pulley provided on the second traveling table and a plurality of fixed pulleys provided on the main body frame. An optical drive wire is wound and installed around a drive pulley that is releasably directly connected to the drive motor installed in the main body, and in this state, the drive pulley is fixed to the main body frame, and the drive pulley and the drive motor are directly connected. A method for replacing an optical drive motor, comprising replacing the drive motor after the release.