JPS59191028A - Optical system driving device - Google Patents

Abstract

PURPOSE:To execute easily coincidence of an initial tension of a wire of both end sides, to execute easily its adjustment, and also to secure exactly a parallel mirror by forming wire members on a rack base in a solid structure, and fixing it at one place. CONSTITUTION:Wires 10a, 11a are extended to fixed pulleys 20, 21, pressed by a fixing member 25 and become one wire from the left and right. Wires 10b, 11b are also extended to fixed pulleys 22, 23 in the same way, extended to a tension adjusting pulley 24 and form one wire. Accordingly, after a mirror is made parallel and an initial tension of the wire is adjusted, the member 25 presses down and fixes the wires 10a, 11a by clamping them with a small screw 26 for clamping the member 25, and the adjustment is completed. The wires 10a, 11a form one wire, therefore, when clamping and fixing them with the screw 26, there is no difference of a wire tension at all between both the ends by consisting so that there is no position shift of the wire.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a driving device for a moving optical system used in a copying machine, etc., and more particularly to an improvement in an optical system driving device using a single wire member. be.

BACKGROUND OF THE INVENTION A moving optical system including a movable reflector (such as a movable mirror) used in conventional copying machines and the like is driven by an optical system drive device.

Especially in slit exposure type copying machines, IL'! It is necessary to move the mirror and the photoreceptor while keeping them parallel to the longitudinal direction of the slit in order to obtain a good bin)-distortion-free image.

Such moving optical systems are provided with rollers at both ends, or rollers on one side and guides on the other end, and are moved back and forth on a mount.

A pulley is provided at the end of the moving optical system on the roller side and is driven by a wire.

Optical system drive devices that drive the moving optical system using a wire stretched on one side do not require optical axis adjustment and are easy to set the wire tension, but they require a support member to support the optical system. However, it was difficult to make the device smaller and lighter.

On the other hand, a double-sided wire drive system in which wires are stretched independently on both sides is advantageous in terms of size and weight reduction, but the tension setting of each wire, the balance of tension between both wires, and the amount of movement There were difficulties in adjusting the balance etc. FIG. 1 shows a drive system of an optical system drive device of a slit exposure type copying machine of a double-sided wire drive type. In the figure, 1.2 is a drive pulley for driving both ends of the mirror support member, and is fixed to the drive shaft 3K with screws or the like.

The drive shaft 3 is rotated forward and backward by a drive mechanism (not shown). Further, the second support member M2 that holds the second and third mirrors has a moving pulley 4.5 at one end and a moving pulley 6.7 at the other end 1H1. Furthermore, a fixed pulley 8.9 that is pivotally supported on the main frame is arranged as shown in the figure.

Next, let's talk about the wiring. On one end side of the support member, a wire member 10a fixed to a frame at one end 12a is wound around a moving pulley 4 in a U-shape, and is fixed to the first mirror support member ML at an intermediate position 14, and is driven. Pulley 1 is wound several times. In addition, the wire member 10b, whose one end 12b is fixed to the stand, is wound around the moving pulley 5 in a U-shape, and then folded back around the fixed pulley 8 and wound around the driving pulley 1 several times, so that it can be used in real snow. The wire is integrated with the member 10n.

The other end of the support member is also stretched in a similar manner, and the wire 1 member 11a and the wire 1 member 1. It is substantially integrated with Ib.

The optical system drive device having the above structure has fixed positions 1.4.15 for fixing the fixed ends 12a 112b - 13a 113b of the wires and the first mirror support member M1, and the drive pulley 1.2 during assembly. By adjusting the mutual phases, parallelism can be achieved and the initial tension applied to the wires can be adjusted to be equal on both sides.

This is because when the first drive shaft 3 starts to rotate and drives the mirror support member, if there is a difference in the initial tension of the wire between the two sides, the mirror support member will run tilted.

Financial Measures 1 We will limit ourselves to the mirror support member M1 and mechanically examine the inclination that occurs here.

The initial tension ta of the wires 10a and 10b on one end side.

The initial tension of the wires 11a and llb on the other end side is tb.

1 drive pulley 1 and the fixing part 14 of the first mirror support member M1
The length of the wire between the two is Aa.

Fixing part 15 between drive pulley 2 and first mirror support member M1
Let the length of the wire between the two be ebl. Usually the length,
6a and length 7b are configured to be approximately equal. The drive shaft 3 is now rotating, and the first mirror support member M is connected via the wire.
Suppose that a force F is transmitted to both ends of the wire 10a's i and the wire 10a's i is driven in the forward direction indicated by the arrow in the figure.
Force F is also applied to ob.

Now, if the spring constant of the wire is R, the length la of the wire 10a on one end side is La=la+(F-ta)/R, and the length lb of the wire 10b on the other end side is Lb=lb+CF-tb)/ R and 1: Cru.

The first mirror support member M1 has a wire length of 1 when assembled.
Although parallelism is maintained in the state of a and zb, the lengths of the wires at the moment of driving become La and Lb, and in this case, unless (y-ta)/R=CF-tb)/R, the first The parallelism of the mirror support member M1 is not maintained.

That is, as is clear from the above discussion, during assembly, not only the static parallel state but also the initial tension t of the wires at both ends
a, , tb must also be equal.

However, conventionally, by tensioning the wire as shown in FIG. 1, it was possible to change the position of the stopping position 14 and 15 after adjusting the initial tension for the first mirror support member M1 and fix it again in a parallel state. However, in the parallel state of the second mirror support member M2 (in other words, the fixed end 12a of the wire
13a z i2b % 1.3b cannot be moved, so the inclination of the second mirror support member M2 is determined by the movable boolean IJ4.
5 and the phase of the dynamic pulley 6.7.

Therefore, in order to adjust the parallelism of the second mirror support member M2, the positional relationship between the second and third mirrors and the moving pulleys 4.5 and 6.7 may be configured to be adjustable. The drive pulleys 1.2 are configured such that their mutual phases can be adjusted.

As an adjustment method to match the initial tension, while measuring the initial tension with a spring scale etc., adjust the fixed end of the wire 12a1]2b.
By adjusting the position of 113as and 13b, as shown in Figure 2, springs 16 and 17 with a small spring constant and controlled accuracy are provided in the wire path, and the displacement of the springs is matched on both sides. Wire fixed end 1.2a 112
b 11.3a z Adjusting the position of 13b.

However, it is difficult to match accurately and it takes time to make adjustments. After arranging the wire members, fix the first mirror support member Mi, fix the second and third mirrors or fix the drive pulley 1.2, and align the mirrors7. ! :However, this task is not easy. In addition, the wire tends to stretch as the number of repetitions of the optical system support member increases, and the amount of stretch of the wire at both ends differs due to variations in the physical properties of the wire, causing the initial tension of the wire to become out of order. Therefore, it is necessary to make adjustments again, which also requires a lot of time. Furthermore, measurement errors or errors in spring scales, errors in springs, etc. are factors that reduce the parallelism of the mirror.

Purpose of the Invention The optical system 1 is driven at a position where the initial tensions of the wires on both sides can be easily matched during assembly, and the optical parallelism of the dynamic mirror support member can be maintained. To provide an optical system drive device that can easily match the initial tensions of wires on both sides in a short time even if readjustment is required due to an increase in the number of movements.

Structure of the Invention The present invention provides a driving device for moving both sides of a plurality of optical systems on a mount using a wire member, in which the wire members provided on both sides have an integral structure, and the wire member is moved at one location. The present invention provides an optical system drive device characterized in that one member is fixed on a frame.

Embodiment Fig. 3 shows an embodiment of the present invention, in which a fixed pulley is newly added to the conventional example shown in Fig. 1, a 21.22X B, a tension adjustment pulley A for tension adjustment, and a fixed member. 5
The wires 10a and lla are hung on fixed pulleys 20 and 21, respectively, and held down by the fixed member 5, so that there is only one wire from the left and right sides. FIG. 4 is a perspective view of the main parts showing the state in which they are integrated by this fixing member part, and FIG. 4 (,) shows the embodiment shown in FIG.
b) and (C) show other examples.

Similarly, the wires 10b and llb are hung on the fixed pulleys n and ot, and then on the tension adjustment pulley 24 to form one wire.

With the above structure, after aligning the mirrors and adjusting the initial tension of the wires, by tightening the machine screws 26 that tighten the fixing member 5, the fixing member 5 holds down the wires 10a-11a and fixes them. Complete the adjustment. Since the wires 10a and lla are one piece, when fixing the wires by tightening the machine screws 26 after adjustment, the difference in wire tension between the two ends (or It has the characteristic of not having any

In addition, as the number of repetitions of reciprocating increases, the wire stretches, and even if the initial tension of the wire goes out of order on both sides, just loosen the machine screws and tighten them again, and the wires 10a and lla on both sides will automatically tighten. The initial tension between the two sides is easily eliminated.

Figure 3 shows one embodiment. However, the relationship between the tensile force/adjustment pulley 24 and the fixing member 5 may be reversed.

Further, it is also possible to provide a plurality of tension adjustment booleans and fixing members 5.

As for the fixing member δ, in FIG. 4(a), the integrated wires IQa and lla are loosened and tightened to freely move and adjust the wires by loosening and tightening the machine screws 26&, and then the fixing member 25a is used to secure the wires IQa and lla to the frame fixing part. It has a structure that allows it to be fixed by being pressed against it. FIG. 4(b) shows the wire 10aslla being held together on the fixing member 25b, and the machine screw 2
6b and fixing member 25b together with
, lla are moved and adjusted from side to side, and then fixed by tightening the small screw 26b. In addition, FIG. 4(c) shows a wire 10a%1 on the fixing member 25c.
The ends of 1a are fixed respectively, and the adjustment method is shown in Figure 4 (b
) is the same as the example. Any of these examples can be used in the present invention.

Effects of the Invention The optical system drive device of the present invention can easily match the initial tension of the wires on both ends, making initial assembly adjustment and readjustment after use extremely easy, and ensuring that the mirror is parallel at the initial stage and during movement. It has a guaranteed excellent effect.

[Brief explanation of the drawing]

1 and 2 show a conventional example, and FIG. 3 shows a drive system according to an embodiment of the present invention. Figure 4 (a), (b),
(c) both show fixing members used in the present invention. 1.2... Drive pulley 3... Drive shaft 4.5.6, 7... Moving pulley 8.9... Fixed pulley 10a, 10b, lla, llb
=- wire one member), 21.22.23...
Fixed pulley 2.1...Dension adjustment pulley...Identification member 26...Machine screw M1...Mirror first support member M2...-・Mirror 2nd support member representative Yoshi Kuwahara Miho, Figure 5

Claims (1)

[Claims] In a drive device that uses a wire member to move both sides of a plurality of optical systems on a pedestal, the wire members provided on both sides have an integral structure, and the wire member is moved on the pedestal at one location. An optical system drive device, characterized in that it is fixed to.