JPH0443337A - Winding and installing method for optical driving wire and locking method for optical system - Google Patents

Abstract

PURPOSE:To easily and surely lock the optical system of an image forming device when the image forming device is shipped and transported by removing a metallic holder after fitting a fitting plate to a 2nd travel table, and using the metallic holder as a metallic lock for the optical system. CONSTITUTION:The wire 76 is put in the metallic clamper 28 of a 1st travel table 20 at a specific position and fixed, and screws 85 and 82 are removed from the metallic holder 81 in this state to detach the metallic holder 81. Then the metallic holder 81 is fixed on a rail table 16 with a screw 82 and the surface of a support frame 41 which connects with a guide part is pressed with the stepped surface of the metallic holder 81 to clamp a lens unit 40. Thus, the metallic holder 81 is utilized as the clamp of the optical system 40 during the forwarding of the image forming device to prevent shock in the transportation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention enables simple, easy, and accurate assembly work of a scanning optical system of an image forming apparatus, and also provides a holding metal fitting as a jig used therein. The present invention relates to an improvement for use as a lock fitting for an optical system of an image forming apparatus.

[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 simply maintaining horizontal movement on the other side.

This eliminates fluctuations that may occur due to different extensions of the wires, making it possible to perform accurate straight-line scanning, compared to a method in which drive wires are provided approximately symmetrically on the left and right sides.

Such a case is described in Japanese Patent Application Laid-Open No. 53-87234.

That is, there is a drive transmission wire wound around a pulley unit attached to the second traveling table, 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. Both ends are fixed to the main body,
A specific point in the middle of the wire is fixed to the first traveling base.

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.

However, in order to ensure 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 body frame, and the drive boot connected to it is also installed inside the seven frames of the main body. The gap between each carriage and its end and the main body frame is made to be extremely small.

[Problem to be solved by the invention]

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

In addition, the scanning optical system is regulated by guide rails or guide bars, whether it is a lens moving table or each traveling table, and maintains its straight running property, but there are parts where the vertical direction depends on its own weight. Yes, and depending on the impact during transportation, it may rattle significantly.

In addition, in the running direction, positioning is performed using cams and springs, and running is performed using wire drive. However, when the above-mentioned impact is applied, the device components become rattled against the spring force and wire regulation. This can lead to injury or functional impairment.

The present invention solves these problems and maintains accurate and stable operation of the scanning optical system, without increasing the size of the image forming apparatus that houses the scanning optical system.
To easily and reliably assemble and adjust a drive system while making it as compact as possible, and to easily and reliably lock an optical system during shipping and transportation of an image forming apparatus using the jig used.

[Failure to solve the problem]

The purpose of this is to provide a scanning optical system of an image forming apparatus in which a first traveling table having an exposure light source and a first mirror and a second traveling table having at least a second mirror and a mirror pulley run parallel to the document surface along a guide bar. In this method, the mirror pulley is installed by temporarily fixing the plate to the main body frame using a holding metal fitting, and then attaching the mirror pulley to a plurality of fixed pulleys provided on the main body frame, and a drive boolean connected to a drive motor installed on the main body. After completing the winding and installation of the optical drive wire, the first traveling base, the second traveling base, and the guide bar are attached, and the mounting is performed after the plate is attached to the second traveling base. This is accomplished by a method for winding and installing an optical drive wire and for opening and closing an optical system, characterized in that the holding fitting is removed and the holding fitting can also be used as a locking fitting for the optical system of the image forming apparatus. .

〔Example〕

A top view of FIG. 1, a front view of FIG. 2, and FIGS. 3(a) and 4(a), which are partially enlarged views of FIG. ) and its third side sectional view.
This will be explained with reference to FIG. 4(b) and FIG. 4(b). However, the present invention is not limited thereto.

The main body 7 frame 11 of the image forming apparatus l includes a scanning optical system lO.
or stored.

Sochi, lamp 24, reflector 23, slit 25, vgl
A first traveling table 20 is equipped with a mirror 26 and runs in the same direction as the original on the document platen glass 18, and a second mirror and a third mirror are mounted and the document moves in the same direction at half the speed of the first traveling table. The lens barrel 41 is regulated by the second carriage 30 that runs on the rail 16 on the shelf 15 of the main body frame and can be set at a predetermined magnification position, the fourth mirror 56 is regulated by the rail 17, and the lens unit 40 is regulated by the rail 17. The document surface on the document table 18 passes through a variable magnification means 50 equipped with a fifth mirror 57 and a fixed sixth mirror 58, and is imaged onto a photosensitive drum 6I rotating at a constant speed ratio with respect to the first traveling table. An image is formed.

Base 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 rollers 27 and 39 mounted on the side opposite to the portion 22.32 of the base frame 21.31 are slidable in the running direction on the guide bar 13 attached to the main body frame 11. A first traveling platform 20 is mounted on and in contact with a rail 14 fixed to 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.

Attach a mirror pulley (hereinafter simply referred to as a pulley) 37 to the rotating support shaft 38 installed in play 1-31A.
are fitted and installed, and furthermore, the mounting plate l-31A
is attached to the frame 31 of the second carriage 30. Further, fixed pulleys 71 and 72 are provided to fit into a rotating support shaft 73 attached to the inner wall surface of the main body frame 11, and are connected to a rotating shaft connected to a motor 74 attached to the shelf 15 of the main body frame. A drive pulley 75 is attached.

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

The first traveling base 20 is fixed to a predetermined location of the wire 76 via a stopper 28. In addition, a plurality of line wires are wound around each fixed boob at an angle of approximately 180 degrees, and a plurality of wires are wound around a drive pulley 75 connected to a motor 74.
A wire having an end on the hook 78 side and a wire having an end on the hook 79 side are wound around the pulley 37 of the second traveling base 30 by 1806 turns in opposite directions.

The space in which the wire 76 is wound and stretched is the inner wall surface of the main body frame 11 and the frame 21.3 of each carriage.
1, and making the space between the two sides as small as possible greatly contributes 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.

A means to overcome such difficulties will be explained below.

During the winding work of the wire 76, the guide bar 13. First traveling platform 20. The second traveling base 30 has been removed from the main body frame 11.

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

When the pulley 37 provided on the second traveling base 30 is attached, the plate 31A is removed from the second traveling base 30, and as a means for not changing its reference position, the holding fitting 81 is attached to the main body 7.
It is fixed to the frame 11 with screws 85. 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 the plate 31A to form a pulley unit, and the pulley 37 is attached to the plate 31A.
is attached to the seven frames 31 of the second traveling base 30. When the second traveling base is removed from the main body, the pulley 37 is left as a unit while being attached to the plate 31A, and the attachment is such that the threaded hole 31G of the plate 31A is connected to the holding metal fitting. 8
1 through the fixing hole 81B of the metal fitting and tightened with a screw 82, and accurate positioning is achieved by the pin hole 31E and the pin-like protrusion 31E' connected thereto. Furthermore, the holding fitting 81 is attached to the main body frame 11 by screws 85.
is fixed to complete positioning. And a window 11A for easily performing this work and the second traveling platform installation work to be described later.
or is bored in the main body frame 11.

In this manner, the fixed pulleys 71 and 72 are also attached to the inner side of the main body frame 11 together with their rotating shafts 73 in a state where the inside of the main body frame 11 is left wide open.

To attach the shelf 15 of the main body frame 11, a pulley 75 connected to a motor 74 attached to the surface is also set, and a wire 76 is wound and installed between each pulley, and either end of the wire 76 is attached to the inner wall of the main body frame 11. Fixed hook 78.
It is called 79. At this time, a spring 77 is interposed on one of the hooks, for example on 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 guide bar 13 via the slide supports 22 and 32, and the notches 19 at both ends of the main body frame 11 are fitted.
After dropping it into the holder, it was positioned and fixed, and each carriage was slid to a predetermined reference position and clamped.In that state, the holder A81 was attached as shown in Fig. 3(a) and (b). As for the installation, which is visible through the escape hole 83 of the metal A81, the screw hole of the frame 31 of the second traveling base is firmly fastened with the screw 31C through the stop hole 31B of the plate 31A. At that time, the pin hole 31D for positioning the frame 31 and the bottle-shaped protrusion 3 of the plate 31A are used for mounting.
1D' is fitted, and the frame 31 and installation are plate 31A.
The position of the carriage 2 is accurately determined, and the attachment of the carriage 2 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.

If the metal fitting 81 is removed by removing the screws 85 and 82 from the holding metal fitting 81 in this state, the installation and adjustment of all the wire hooks is completed.

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).

Further, the holding fitting 81 that has contributed to the easy and reliable work of winding and installing the wire 76 can also contribute to the work of winding and installing the wire when overhauling the image forming apparatus after shipment. Furthermore, in order to prevent each component from wobbling during shipping, a holding bracket 81 is used to rotate the support frame 41 and guide portion 42 of the lens unit 40 around the drive shaft 43 on the rail 16 for variable magnification. It is made movable by a cam 44 and a spring 45, and can be set to any magnification position.However, various forces are applied during shipping and transportation, and the vertical direction is guided by the rail in this case, so it is not safe. It is safe because it cannot move in one direction in the guide direction of the rail, that is, in the direction in which it presses against the cam 44. However, in the opposite direction, the spring 45
Because it can move against

In order to prevent this, the holding fitting 81 is fixed on the rail base 16 with screws 82 as shown by the two-dot chain line in FIG. Since the surface is pressed down, the lens unit 40 is completely clamped. Further, by screwing a screw into a screw hole provided in the stepped surface, the height direction of the stepped surface can be adjusted to make the clamping more reliable.

Similarly, using the holding fitting 81, the first. Each second moving table 20
．． Although not shown, it is easily possible to use the holding fittings 81 to maintain the state in which the rollers 27 and 39 of 30 are in contact with the rail 14.

Furthermore, the movable table 51 on which the fourth mirror 56 and the fifth mirror 57 are mounted as the variable magnification means 50 can also be easily clamped to the rail 17 using the holding fittings 81, as described above, and protection during transportation is reduced. You can achieve your goals.

[Effects of the Invention] According to the method of the present invention, the mirror pulley is first temporarily fixed with a holding metal fitting, and the optical drive wire can be wound around the plurality of fixed pulleys and the drive pulley, so the scanning optical system can be miniaturized.
Even if the drive device is placed in a narrow space, the ease and accuracy of its assembly work will not be compromised, and the entire image forming device can be made compact, stable, and reliable. Furthermore, the holding fittings can be used, for example, to clamp the optical system of an image forming apparatus during shipping and transportation, thereby making it possible to prevent shocks during transportation.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a scanning optical system used in one embodiment 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. Figures 3(b) and 4(b) are respectively shown in Figure 3(a).
). FIG. 4(a) is a side sectional view of FIG. l... Image forming device IO... Scanning optical system 11.
...Body frame IIA...Window 11B...Stopping hole 13...Guide bar 14...Rail 15...Shelf part I6...Rail
I7...Rail 18...Original table 20...First carriage 21...Travel frame 22...Guide receiver part 28...Stopper 31...Travel frame 31C...・Screws 31D', 31E'...Bottle-shaped protrusion 31G...Screw hole 35...Second mirror 37...Mirror pulley 38...Rotation shaft 40...Lens unit 42...Guy Door portion 44...Cam 50...Magnification variable means 56...Fourth mirror 61...Photosensitive drum 73...Rotation shaft 75...Drive pulley 77...Spring 81...・Holding metal fittings 82...Biss (booley) 27.39...Roller 30...Second traveling base 31A...Mounting is done on plates 31D, 31E...Bin hole 32...Guide receiver is part 36... Third mirror 41... Lens barrel 43... Drive shaft 45... Spring 51... Moving base 57... Fifth mirror 71, 72... Fixed pulley 74... Motor 76... Wire 78.79... 7 hooks 81B... Stopper hole 83... Relief hole 85... Screw

Claims (1)

[Claims] In a scanning optical system of an image forming apparatus in which a first traveling table having an exposure light source and a first mirror and a second traveling table having at least a second mirror and a mirror pulley run parallel to a document surface along a guide bar, the mirror pulley Temporarily fix the mounting plate to the main body frame using the retaining metal fittings,
After winding and installing the optical drive wire around the mirror pulley, a plurality of fixed pulleys provided on the main body frame, and a drive pulley connected to a drive motor installed on the main body, the first traveling base and the After attaching the second traveling base and the guide bar and further attaching the mounting plate to the second traveling base, the holding metal fitting is removed, and the holding metal fitting is replaced with a locking metal fitting of the optical system of the image forming apparatus. A method for winding and installing an optical drive wire and locking an optical system, characterized in that it can be used for both purposes.