JPS61243437A - Driving device for moving optical system of copying machine or the like - Google Patents

Abstract

PURPOSE:To eliminate a twist and to make a moving scan by providing the 1st optical system with wire fixing ends and the 2nd optical system with movable pulleys in a copying machine which moves the 1st and the 2nd optical systems to make an exposure scan, and driving them through two wires. CONSTITUTION:The wire fixing ends 28a and 28b are provided to both ends of the 1st optical system 26 and the movable pulleys 29a and 29b are provided to both ends of the 2nd optical system 27. Further, fixed pulleys 31a-31f and a driving pulley 30 for motor driving are provided to both sides of a scanning path. The 1st wire 32 is extended among the movable pulley 29a, pulley 31a, driving pulley 29b, pulleys 31c-31f, and fixing end 28a. The 2nd wire 33, on the other hand, is extended among the movable pulley 29b, pulleys 31c-31f, and fixing end 28b. The 1st wire 32 and the 2nd wire 33 are coupled by a fastener 34. The 1st optical system 26 and the 2nd optical system 27 are driven to both sides by the driving pulley 30. The 2nd optical system 27 is moved a half as fast as the 1st optical system 26. Thus, both side driving is carried out by the 1st and the 2nd wires, so the twist and inclination of each optical system are eliminated to make a stable scan.

Description

TECHNICAL FIELD The present invention relates to a moving optical system drive device in a copying machine or the like that exposes and scans a document using first and second optical systems and sequentially forms an image on a light receiving section such as a photoreceptor or COD.

BACKGROUND ART In general, in this type of copying machine, a first optical system including a lamp and a first mirror, and a second optical system including a second mirror are movably provided. and the second optical system are moved in the same direction at a speed of 2:1 to keep the optical path length constant and form the original image on a photoreceptor or the like.

Looking at conventional optical system drive methods, a one-sided wire drive method as shown in FIG. 4 is often adopted. That is, the first optical system 1 and the second optical system 2 are driven by a wire 3, and this wire 3 connects from one end fixed side to a movable pulley 4 provided on one side of the second optical system 2 and a scanning path. A fixed pulley 5a provided at one end of one side, a driving pulley 6, a fixed pulley 5b provided at the other end of one side of the scanning path, a wire fixed end 7 on one side of the first optical system 1, and the movable pulley 4 are stretched. By driving the wire 3 with the driving pulley 6, the first optical system 1 and the second optical system 2 can be scanned with a speed relationship of 2=1. Become.

However, in the case of this one-sided wire drive method, the optical systems 1 and 2 tend to tilt or vibrate when starting or returning. In particular, when the scanning speed is increased, this tilt and vibration become large, so it is necessary to increase the rigidity of the constituent members of the optical systems 1 and 2.

In order to eliminate the drawbacks of such one-sided wire drive system,
As shown in FIG. 5, there is also a type that uses wires on both sides. This includes fixed pulleys 10a, 10b, lla, ll at both ends of the scanning path of the first optical system 8 and the second optical system 9.
b, drive pulleys 13a and 13b supported by one support shaft 12 provided in the scanning path width direction are provided, and wire fixed ends 14 are provided at both ends of the first optical system 8.
a.

14b, movable pulleys 15a, 1 are provided at both ends of the second optical system 9.
5b and a wire 16a on each side.

16b is stretched. However, in the case of this method, it is necessary to increase the rigidity of the support shaft 12 in order to prevent the support shaft 12 from twisting so as to cope with high-speed scanning. Increasing the rigidity of the support shaft 12 in this way increases the moment of inertia of the support shaft 12, which requires a large drive torque.

Purpose The present invention has been made in view of the above points.
2 without twisting or tilting the optical system.

Another object of the present invention is to provide a moving optical system drive device for a copying machine or the like that can perform scanning movement at high speed without requiring a large drive torque.

Structure In order to achieve the above object, the present invention has a first optical system and a second optical system.
These optical systems are set to move and scan the second optical system in the same direction with respect to the first optical system at a speed of 1/2, and perform exposure scanning of the original to extract information from the original. In a copying machine or the like that sequentially images reflected light on a light receiving section, the first optical system is provided with wire fixed ends at both ends, and the second
Movable pulleys are provided at both ends of the optical system, and a drive pulley is provided outside the scanning range of these optical systems.
A plurality of fixed pulleys are provided at both ends of the scanning paths of these optical systems, and a wire fixed end at one end of the first optical system, a movable pulley at one end of the second optical system, a part of the fixed pulley, and the drive A first wire is provided that is stretched through a pulley and driven by the driving pulley, and is stretched through a wire fixed end at the other end of the first optical system, a movable pulley at the other end of the second optical system, and another fixed pulley. The present invention is characterized in that a second wire is provided, and a second wire is partially connected and fixed to the first wire at a close parallel portion along the scanning direction of the optical system.

Hereinafter, a first embodiment of the present invention will be described based on FIGS. 1 and 2. FIG. 2 shows an example of the basic configuration of an optical system of a copying machine to which the present invention is applied. First, the original 18 set on the contact glass 17 is moved to the lamp 19.
The reflected light from the original 18 is transmitted to the first mirror 20, the second mirror 21, the through lens 22, and the third and fourth mirrors 23.
, 24 on a photoreceptor 25 (light receiving section) to form a latent image. Here, the H document 18 is fixed on the contact glass 17, and the document 18 is scanned by exposure scanning of the optical system. For this reason, the lamp 19 and the first mirror 20 are integrated into a unit as a first optical system 26, and are movable back and forth so that the surface of the document can be scanned.

Further, the second mirror 21 is used as a second optical system 27, and moves in the same direction at a speed of v/2 when the speed of the first optical system 26 is V, so as to maintain a constant optical path length during exposure scanning. is set to.

A drive system for such first and second optical systems 26 and 27 is shown in FIG. First, wire fixed ends 28a and 28b are provided at both ends of the first optical system 26.

"The second optical system 27 is provided at both ends of the second optical system 27.
Movable pulleys 29a and 29b are provided for moving together with the motor 7 to ensure a 1/2 speed relationship. Further, a drive pulley 30 is provided outside the scanning range of the first and second optical systems 26 and 27 and is rotationally driven by a motor or the like. Furthermore, these first and second optical systems 26.27
For example, six fixed pulleys 31a are installed at both ends of the scanning path.
~31f are provided. Thus, from the movable pulley 29a at one end of the second optical system 27 to the fixed pulley 31a, the drive pulley 3o, and the fixed pulley 31b (fixed pulley 31
a) and the wire fixed end 28a at one end of the first optical system 26.
The first wire 32 is stretched in a loop so as to return to 9a.
is provided.

Both ends of this first wire 32 are fixed to a stand or the like. Further, from the movable pulley 29b at the other end of the second optical system 27, fixed pulleys 310 to 31f and the first
A second wire 33 is provided in a loop shape so as to pass through the wire fixed end 28b at the other end of the optical system 26 and return to the movable pulley 29b. Both ends of this second wire 33 are also fixed to a stand or the like. Here, the first of these,
The two wires 32 and 33 are connected and fixed by a fixture 34 between fixed pulleys 31a and 31b (between fixed pulleys 31d and 31a), which are stretched in close proximity and parallel to the scanning direction.

In such a configuration, by rotating the drive pulley 30 in a predetermined direction to wind and move the first wire 32, the second wire 33 connected by the fixture 34 is also driven. As a result, the first and second optical systems '26 and 27 move to expose and scan the original 18. and,
By reversing the rotation direction of the drive pulley 30, the first
, and the two optical systems 26' and 27 perform a return operation. In these reciprocating movements, regarding the first optical system 26, the first and second wires 32 and 33 are connected to the wire fixed ends 28a and 2, respectively.
．． Since both ends are connected by 8b, both sides are driven, and the first optical system 26 is driven in a well-balanced state on both sides without being twisted or tilted. This is the second
The same goes for the optical system 27 side, and the first and second wires 32.3
3 are connected at both ends by movable pulleys 29a and 29b, so both sides are driven, and the second optical system 27 is also driven in a well-balanced manner without twisting or tilting.

At this time, the movable boolean IJ 29 is connected to the second optical system 27.
Since the connection is made through a and 29b, a speed of 1/2 relative to the first optical system 26 is maintained. By such both-side driving, the guide members for the first and second optical systems 26.27 can also be simplified, and the weight of the first and second optical systems 26.27 itself can be reduced. Furthermore, since it does not use a supporting shaft system that spans the width direction as in the past, there is no need to increase the driving torque. In this way, high-speed scanning can be performed satisfactorily.

Next, a second embodiment of the present invention will be described with reference to FIG. Basically, it is the same as the previous embodiment, but the position of the drive pulley 30 is changed, and the first and second wires 3
This is a modification of the tensioning route for the fixed boos 1J31a to 31f in 2.33. Note that the drive pulley 30 is outside the movement range of the fixture 34, and the first and second optical systems 26.2
The position can be set as appropriate as long as it does not interfere with the scanning and return of step 7.

In addition, in this example, the application example to a copying machine was explained, but
The present invention can be similarly applied to a moving optical system in a facsimile reading device, a digital copying machine, etc., which uses a CCD, a photodiode array, or the like as a light receiving section instead of the photoreceptor 25.

Effect As described above, the present invention provides the first and second optical systems with respect to the first and second optical systems.
, two wires are arranged at both ends of each wire, and these first and second wires are connected to each other.
The wires are partially connected and the first drive pulley is connected to the
Since the first and second optical systems can be driven on both sides by two wires, the first and second optical systems can be scanned in a stable state without requiring a large driving torque and without causing left/right twisting or tilting. It can be moved and enables high-speed scanning without any problems.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of the present invention, and FIG.
The figure is a side view showing the basic configuration of the optical system, FIG. 3 is a schematic perspective view showing the second embodiment of the present invention, FIG. 4 is a schematic perspective view showing a conventional example of the one-sided wire system, and FIG. FIG. 2 is a schematic perspective view showing a conventional example of a double-sided wire system. 18... Original, 25... Photoreceptor (light receiving section), 26.
...First optical system, 27...Second optical system, 28a, 28
b...Wire fixed end, 29a, 29b...Movable pulley, 30...Drive pulley, 31a-31f...Fixed pulley. 32...first wire, 33...second wire, 34.
・Fixing tool 3Z

Claims (1)

[Claims] It has a first optical system and a second optical system, and these optical systems are set to move and scan the second optical system in the same direction with respect to the first optical system at 1/2 the speed of the original. In a copying machine or the like that performs exposure scanning and sequentially images reflected light from a document on a light receiving section, the first optical system is provided with wire fixed ends at both ends, and the second optical system is provided with movable pulleys at both ends, A drive pulley is provided outside the scanning range of these optical systems, and a plurality of fixed pulleys are provided at both ends of the scanning paths of these optical systems, and a wire fixed end at one end of the first optical system and the first wire fixed end are provided at both ends of the scanning paths of these optical systems. A first wire is provided that is stretched through a movable pulley at one end of the two optical systems, a part of the fixed pulley, and the drive pulley and is driven by the drive pulley, and a fixed end of the wire at the other end of the first optical system. The wire is stretched through a movable pulley at the other end of the second optical system and another fixed pulley, and a portion is connected and fixed to the first wire at a close parallel portion along the scanning direction of the optical system. A moving optical system drive device for a copying machine or the like, characterized in that a second wire is provided.