JPH06160985A - Copying device - Google Patents

Abstract

PURPOSE:To simplify an adjusting work necessary for smoothly moving an optical element for a copying device while keeping the posture of the optical element. CONSTITUTION:A mirror holder 235 for holding the optical element to be moved is supported in cantilever so as to freely ascend and descend by engaging both guide bushes 237A and 237B of an elevation body 237 with a main guide shaft 247 which is erected so that the axial core may agree with the vertical direction. A distance L between both guide bushes is adjusted so as to prevent the mirror holder 235 from getting twisted by taking considerations of 21 force applied on the mirror holder 235 (gravity of each member and a transmitted driving force, etc.). By adjusting in such a way, the mirror holder 235 supported in cantilever smoothly ascends and descends along the main guide shaft 247 by use of a ball screw 246, etc., while keeping the posture of the optical element with reference to the main guide shaft 247. And also, the rotation of the mirror holder 235 around the main guide shaft 247 is controlled by a subguide shaft 248 whose parallelism, etc., with reference to the main guide shaft 247 is not required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying apparatus for copying an image on a document onto a recording material. More specifically, the magnification is increased by moving an optical element of an optical system for forming an image on the document on the recording material. The present invention relates to a copying machine that changes.

[0002]

2. Description of the Related Art Conventionally, in this type of copying apparatus, at least one of the optical elements constituting the optical system is movable for changing the magnification and scanning the image. A copying apparatus in which an optical system is movable for changing the magnification has a lens for image formation, and is provided with a configuration for changing the optical path length between this lens and a document or the optical path length between the lens and a recording material. Various configurations of such an optical system are known. Especially, in the case where a document is conveyed and copied by a slit-shaped optical image, the degree of freedom in designing the optical system is high. Realizing a structure that changes the optical path length by moving the optical element up and down, downsizing of the copying machine,
As a result, it has been proposed to reduce the installation space.

For example, two mirrors are arranged orthogonally so that the reflected light returns in the direction of the incident light, and the direction of the incident light incident on the combination mirror is set to be vertically upward, and the combination mirror reflects the incident light. It is configured to be able to move up and down along the direction. And if you raise and lower the combination mirror,
The optical path length is decreased / increased by the moving distance (elevation distance) of the mirrors when the combined mirrors are moved up / down. Therefore, if this combination mirror is moved up and down by a drive mechanism using a stepping motor or the like as a drive source and is precisely positioned, the optical path length can be accurately changed.
It is possible to easily and accurately set the magnification when forming an image of a document on a recording material.

Explaining the above-mentioned structure concretely, as shown in FIG. 7, a pair of guide shafts 502 and 504 are erected parallel to each other, fitted into the respective guide shafts, and slid along the guide shafts. Guide block 5 having bushes 506 and 508
Prepare 10,512. Then, a mirror holder 516 holding the combination mirror 514 which is an optical element.
The guide blocks 510 and 512 are fixed to the guide blocks 510 and 512, the guide bushes 506 and 508 of the respective guide blocks are fitted to the guide shafts 502 and 504, respectively, and the mirror holder 516 is hung over the pair of guide shafts. Therefore, the combination mirror 514 has the guide bush 50 of each guide block.
6, 508 is guided along the guide shafts 502, 504 and can be vertically moved up and down.

A stepping motor 518 with an electromagnetic clutch is used as a drive source for moving the combined mirror 514 up and down, and a ball screw 520, a ball nut 522, and a nut holder 524 for engaging the ball nut 522 with the mirror holder 516. Through
The rotational drive of the motor is converted into a vertical driving force and transmitted to the mirror holder 516. Therefore, when the stepping motor 518 is driven by a predetermined number of pulses, the combination mirror 514 moves up and down along the guide shafts 502 and 504 by the amount of rotational drive of the motor and the amount of movement defined by the ball screw pitch.

In place of the combination of the pair of guide shafts and the guide bushes fitted to the guide shafts, a combination of a pair of linear guides and a guide block sliding along the guide surfaces is also used.

[0007]

When the combination mirror 514, which is an optical element, is moved up and down along the guide shafts 502 and 504 and the posture of the combination mirror 514 with respect to the guide shafts 502 and 504 changes, the combination mirror 514 enters the combination mirror 514. The incident light to be transmitted is the combination mirror 51.
After the reflection at 4, the optical path will be different from the previous one. Therefore, the combined mirror 514 is maintained while maintaining the posture with respect to the guide shafts 502 and 504.
It is essential to raise and lower along 02,504.

Therefore, in the copying machine having the above-mentioned structure for moving the optical element up and down, the pair of guide shafts 50 is used.
2, 504 are erected while ensuring their parallelism with high accuracy, and the parallelism and pitch of this guide shaft and the parallelism and pitch of the guide bushes 506 and 508 in the mirror holder 516 are matched with high accuracy. Need to be adjusted. If the parallelism of the guide shafts and the guide bushes is not so high, the guide shafts 502, 50
Combination mirror 51 while maintaining the posture with respect to 4
The mirror holder 516 cannot be smoothly moved up and down along the guide shaft. Even if a pair of linear guides is used, there is a similar problem.

As described above, in order to vertically install the pair of guide shafts while ensuring their parallelism with high accuracy and to adjust the relationship between the guide shafts and the bushes with high accuracy, a high degree of skill and great labor are required. Needed and complicated. Such complicated adjustment work must be performed not only when the guide shaft or the like is assembled, but also when the guide shaft is erroneously impacted.

The present invention has been made to solve the above problems, and moves the optical elements constituting the optical system for forming the image on the original on the recording material smoothly and while maintaining its posture. The purpose is to simplify the necessary adjustment work.

[0011]

In order to achieve the above object, the means adopted by the present invention is an optical system for forming an image on a document on a recording material, and an optical element forming the optical system. A copying device for copying the image on the original document onto the recording material by changing the magnification by the movement of the optical element, which is provided along the moving direction of the optical element. A column for converting the rotational driving force of the driving means into a driving force for moving the optical element, a guide shaft provided in parallel with the column, an optical element holding member for holding the optical element, and an engagement with the column. And has a plurality of sliding portions that are fitted to the guide shaft and slide along the guide shaft at predetermined intervals, are fixed to the optical element holding member, and are converted by the column. The driving force causes the optics to move along the guide axis. A sliding member that moves the element holding member; and a rotation restricting member that engages with the optical element holding member and restricts rotation of the optical element holding member that moves along the guide axis around the guide axis. The gist of the invention is that the distance between the sliding portions is adjusted so as to move the optical element holding member along the guide shaft while maintaining the posture of the optical element with respect to the guide shaft. .

[0012]

The copying apparatus of the present invention constructed as described above is
The support provided along the moving direction of the optical element that constitutes the optical system converts the rotational driving force of the driving unit into a driving force that moves the optical element and transmits the driving force to the optical element holding member that holds the optical element. . Therefore, the driving force that receives this transmission causes the optical element to move via the optical element holding member, so that the magnification is changed.

Further, by providing the guide shaft in parallel with the support column, the guide shaft serves as a movement locus of the optical element. Further, the optical element holding member is fixedly provided with a sliding member having a plurality of sliding portions that slide along the guide shaft. Then, by fitting each sliding portion of the sliding member to the guide shaft,
The optical element holding member, that is, the optical element held by the optical element holding member is supported on the guide shaft in a so-called cantilever state and guided along the guide shaft.

On the other hand, since the rotation restricting member engaged with the optical element holding member restricts the rotation of the optical element holding member around the guide shaft, the optical element cantilevered by the guide member by the sliding member. The holding member, and thus the optical element, moves along the guide axis without rotating about the guide axis. Then, the spacing of the sliding portion of the sliding member that cantilevers the optical element on the guide shaft is adjusted so that the optical element holding member can be moved along the guide shaft while maintaining the posture of the optical element with respect to the guide shaft. I chose That is, by adjusting this distance, the optical element holding member supported in a cantilever manner is prevented from being twisted by the weight of the member itself or the optical elements held by the holding member or the driving force transmitted through the support column. It becomes possible to do.

Therefore, in moving the optical element smoothly along the moving direction while maintaining its posture,
It suffices to adjust the guide shafts along the columns to adjust the intervals of the sliding parts of the sliding members.

Since the weight of the optical element holding member cantilevered on the guide shaft and the weight of the optical element held by the guide shaft, and the magnitude of the driving force transmitted through the support column are known from the design stage, At the stage, the interval between the sliding parts is determined.
Therefore, it is not necessary to adjust this interval during assembly.

[0017]

Preferred embodiments of the present invention will be described below in order to further clarify the structure and operation of the present invention described above. FIG. 1 shows a slit exposure type copying camera 20 (hereinafter simply referred to as copying camera 2) which is a kind of copying apparatus as an embodiment.
It is an explanatory view showing the whole composition seen from the front and the side.

As shown in the figure, the copying camera 20 is
A document rack drive unit 100 incorporating a base body 40 accommodating the electronic control device 30 and the like, and a mechanism assembled on the base body 40 to convey the document rack 50 in the horizontal direction.
And an optical unit 200 and a drum unit 300 that are integrally assembled above the document rack drive unit 100.
It consists of and. Two magazines A and B containing roll-shaped photosensitive materials can be mounted on the drum unit 300, and a collecting box 305 for collecting the exposed photosensitive materials can be attached.

Next, the structure of each part will be briefly described. The document rack driving unit 100 carries the document rack 50 in the horizontal direction by using a stepping motor 102 as a power source, and transports the document rack 50 slidably held on a transport rail (not shown). It is conveyed using 110. The document rack 50 is composed of a lower frame 52 in which a transparent glass on which a document is placed is fitted, and an upper frame 55 which is supported by two gas springs 53 on the left and right from the lower frame 52 and in which the transparent glass is similarly fitted. ing. The original to be copied is placed on the glass plate of the lower frame 52 with the upper frame 55 opened upward, and is ready for copying with the upper frame 55 closed.

An operation panel 60 (see FIG. 5) is arranged on the upper portion of the frame of the document stack driving unit 100, and the operation panel is used to instruct the copy magnification and the start of the exposure operation of the copy camera 20. Has been done. Note that the details thereof are omitted because they are not directly related to the gist of the present invention.

Next, the structure of the optical unit 200 will be described. The optical unit 200 uses the drum 31 provided on the drum unit 300 to convert an optical image obtained from a document.
It is for forming an image on the photosensitive material which is electrostatically adsorbed to zero. The optical system of the optical unit 200 includes a lens 2 for image formation.
02, a first lamp unit 204 for a reflective light source, a second lamp unit 206 for a transmissive light source, and first, second, and third mirrors 211, 212, 213 that guide light from a document to a lens 202. , Fourth, fifth, sixth and seventh mirrors 21 for guiding the light passing through the lens 202 to the sensitive material
4, 215, 216, 217. Of these, the third, fourth and seventh mirrors 213, 214, 21
7 is fixed to the optical unit 200. On the other hand, the first and second mirrors 211 and 212 are incorporated in the object-side moving mirror unit 220 that can move up and down.
The mirrors 215 and 216 are also incorporated in the image-side moving mirror unit 230 that can be moved up and down.

The object-side moving mirror unit 220 and the image-side moving mirror unit 230 can be raised and lowered independently of each other, and depending on the raising and lowering position, the optical distance (object distance) X from the document to the lens 202 or the lens 202 can be changed. An optical distance (image distance) Y to the surface of the drum 310 is determined. If both distances X and Y satisfy the relationship of 1 / F = 1 / X + 1 / Y (1) with respect to the focal length F of the lens 202, the optical image of the original image is formed on the surface of the drum 310. The magnification at that time is Y / X. Therefore,
If the object-side moving mirror unit 220 and the image-side moving mirror unit 230 are moved so as to satisfy the relationship of Expression (1) according to the designated magnification, the photosensitive material electrostatically adsorbed on the surface of the drum 310 is An image of specified magnification can be obtained.
Control of the positions of the object-side moving mirror unit 220 and the image-side moving mirror unit 230 is performed by the electronic control unit 3 described later.
Performed by 0.

Since the copying camera 20 of the embodiment is of the slit exposure type, the optical magnification has meaning only in the width direction of the original. The magnification in the length direction of the document is 5
It is determined by the ratio of the transport speed of 0 and the peripheral speed of the drum 310. Therefore, the electronic control unit 30 sets the mirror units 220, 23 according to the magnification input from the operation panel 60.
After controlling the position of 0, at the time of exposure, the document rack 50
And the speed ratio of the drum 310 is also controlled. In practice, the rotation speed of the drum 310 is constant and the conveyance speed of the document rack 50 is variable.

The mechanical structure of the optical unit 200 and the mechanism for moving the object side moving mirror unit 220 and the image side moving mirror unit 230 up and down will be described with reference to FIGS.
Will be explained. 2 is a side view of a main part of the optical unit 200, FIG. 3 is a front view of a mechanism for moving up and down the image side moving mirror unit 230, and FIG. 4 is an arrow AA in FIG. It is a perspective view.

As shown in FIGS. 2 and 3, the optical unit 200 has its own left and right side plates 240 and 241, a top plate 243, and a bottom plate 244 inside the frame of the entire copy camera 20.
With a frame consisting of. This top plate 243 and bottom plate 24
An object-side moving mirror unit 220 and an image-side moving mirror unit 230 are vertically movable between them.

As shown in FIG. 4, the image side moving mirror unit 230 has the fifth mirror 215 and the sixth mirror 216 attached to the mirror cases 232 and 233 at both ends of the mirrors and accommodated therein. Are fixed to the mirror holder 235. Further, the mirror holder 235 is fixed to the elevating body 237 via the support member 236. Similarly, the object side moving mirror unit 22
In the case of 0, the first mirror 211 and the second mirror 212 are attached and housed in the mirror cases 222 at both ends of the mirror (see FIG. 2).
It is fixed at 25. Furthermore, this mirror holder 225
Are fixed to the lifting body 227 via a support member 226.

Next, taking the image side moving mirror unit 230 as an example, the structure around the elevating bodies 227 and 237 will be described in detail. Although not shown, the support structure of the object-side moving mirror unit 220 and the configuration of each guide shaft and the like are also the same.

The top plate 243 and the bottom plate 2 of the optical unit 200
As shown in FIG. 3, a main guide shaft 247 for guiding the image-side moving mirror unit 230 is provided between the main guide shaft 247 and the reference numeral 44.
(Diameter 30 mm) and a ball screw 246 (diameter 18 m for moving the image side moving mirror unit 230 up and down).
m, feed pitch 8 mm), and a sub guide shaft 248 for restricting rotation of the image side moving mirror unit 230 around the main guide shaft 247.

The main guide shaft 247 is mounted on the top plate 243.
When installed between the bottom plate 244 and the bottom plate 244, its axis is adjusted to coincide with the vertical direction, which is the movement locus of the image-side moving mirror unit 230. Further, the ball screw 246 is erected so that its axial center is substantially aligned with the main guide shaft 247. Further, as shown in FIG. 3, the ball screw 246 has a main guide shaft 247 in order to avoid interference with the lens 202 arranged at the center of the left and right side plates 240 and 241 of the optical unit 200.
It is provided offset to the side. Moreover, the distance l between the ball screw 246 and the main guide shaft 247 is set to about 50 mm so that the driving force is transmitted to the mirror holder 235 via the ball screw 246 as close to the main guide shaft 247 as possible.

Since the main guide shaft 247 and the ball screw 246 are provided so that their axes are substantially aligned with each other,
In FIG. 2, only a part of the ball screw 246 is shown. The sub guide shaft 248 is not shown. Also, the object side moving mirror unit 22
At 0, only the ball screw 245 is shown.

A guide bush 237 is attached to the lifting body 237.
A and 237B are fitted and fixed to the upper end and the lower end of the lifting body 237 at intervals L, respectively. Both guide bushes 237A and 237B are connected to the main guide shaft 247.
It fits and slides along its outer circumference smoothly and without rattling, and has a height of 20 mm. Therefore, by fitting the guide bushes 237A and 237B of the lifting body 237 to the main guide shaft 247, respectively,
As shown in FIGS. 3 and 4, the image-side moving mirror unit 230 is cantilevered by the main guide shaft 247 via the elevating body 237 and is supported so as to be vertically movable along the main guide shaft 247. Become. That is, the image-side moving mirror unit 230 is guided along the main guide shaft 247 in a cantilevered state.

Here, both guide bushes 237A, 237
The interval L of B will be described. As described above, when the image side moving mirror unit 230 is cantilevered by the main guide shaft 247 and the driving force is transmitted to the image side moving mirror unit 230 via the ball screw 246, the fifth mirror 215 and the sixth mirror 215. Mirror holder 2 for holding 216
The weight of each member around the mirror holder 235 and the transmitted driving force act on 35. Therefore, if the distance L between the guide bushes 237A and 237B is narrow, the mirror holder 235 and thus the image-side moving mirror unit 230 cannot be properly cantilevered against the force acting on the mirror holder 235, and the mirror holder 235 cannot be supported. Twist occurs.
When such a situation occurs, the image side moving mirror unit 23
0 cannot be smoothly moved up and down along the main guide shaft 247. Further, since the mirror holder 235 is tilted with respect to the main guide shaft 247, the attitudes of the fifth mirror 215 and the sixth mirror 216 with respect to the main guide shaft 247 are changed.
Therefore, the optical path K (see FIG. 2) after being reflected by the fifth mirror 215 and the sixth mirror 216 becomes an optical path different from the previous one.

Therefore, in this embodiment, both guide bushes 2 are
The distance L between 37A and 237B was adjusted to about 180 mm in consideration of the force acting on the mirror holder 235 (the weight of each member, the driving force transmitted, etc.). In addition, this interval L is about 1
In this embodiment, the main guide shaft 2 has a length of 80 mm.
The point of action of the driving force transmitted from the motor 47 (ball screw 24
6 and the space between the main guide shaft 247 (l (= 50 mm))
In consideration of the above, the relational expression L ≧ l is established between the interval L and the interval l. That is, the interval L is set in consideration of the moment generated based on the driving force transmitted through the ball screw 246.

By making such adjustments, the mirror holder 235 is supported by the main guide shaft 247 in a cantilever manner so as not to twist, and the postures of the fifth mirror 215 and the sixth mirror 216 with respect to the main guide shaft 247 are adjusted. The image side moving mirror unit 230 can be smoothly moved up and down along the main guide shaft 247 while maintaining the same.

The above-mentioned distance L can be set to exceed 180 mm, but it is set to 180 mm as a reasonable distance in terms of equipment design or assembly. Further, when the elevating body 237 is provided with a single guide bush having the same length as the elevating body 237, the sliding contact area between the main guide shaft 247 and the guide bush increases, so that the main guide shaft 247 extends along the main guide shaft 247. The image-side moving mirror unit 230 cannot be smoothly moved up and down, which is unreasonable. Further, since the guide bushes 237A and 237B are integrated, the weight is increased, which adversely affects the torque of the motor.

A pulley 254 is attached to the shaft end of the ball screw 246 protruding above the top plate 243, and is connected to a drive motor 256 for raising and lowering the image side moving mirror unit via a drive belt 255. Therefore, the rotation of the drive motor 256 is transmitted to the ball screw 246 via the drive belt 255 and the pulley 254. When the ball screw 246 rotates, the ball screw 246 is converted to the vertical direction by the combination with the ball nut 238 fixedly provided on the elevating body 237 and transmitted to the elevating body 237, so that the main guide shaft 247 is cantilevered. The image-side moving mirror unit 230 is smoothly moved in the vertical direction along the main guide shaft 247 via the elevating body 237 as described above and the fifth mirror 21 with respect to the main guide shaft 247.
5, The sixth mirror 216 is moved up and down while maintaining its posture.
Similarly, for the object side moving mirror unit 220, the rotation of the drive motor 252 is transmitted to the object side moving mirror unit 220 by the drive belt 251, the pulley 250, the ball screw 245, the ball nut, etc. Moves up and down along the main guide shaft via the lifting body 227. Both mirror units are independently moved up and down.

Further, the support member 236 has a mirror holder 235 depending on a screw feed amount toward the mirror holder 235.
Adjusting screw 23 for adjusting the angle of the lifting body 237
6A is provided. Therefore, this adjustment screw 236A
Thus, the horizontal adjustment of the mirror holder 235 in the image side moving mirror unit 230 is performed. That is, the fifth mirror 215, the sixth mirror 216 of the image side moving mirror unit 230 and the first mirror of the object side moving mirror unit 220 fixed to the mirror holder 235 in a predetermined positional relationship (positional relationship in which both mirrors are orthogonal to each other). 211, second
The optical path K shown in FIG. 2 is adjusted by the mirror 212 and the like.

Further, the mirror holder 235 is provided with a guide member 239 which engages with a sub guide shaft 248 for restricting the rotation of the image side moving mirror unit 230 around the main guide shaft 247. As shown in FIG. 4, the sub guide shaft 248 and the guide member 239 are merely engaged with each other in a form that allows play in the left and right directions, but by engaging in this way, the main guide Axis 24
The rotation of the image-side moving mirror unit 230 around 7 is reliably regulated. Therefore, the sub guide shaft 248 is not required to have high parallelism with the main guide shaft 247, the ball screw 246, and the like.

Next, the structure of the drum unit 300 will be briefly described with reference to FIG. Drum unit 300
Draws the sensitive material stored in the upper magazine A or the lower magazine B, and winds the sensitive material around the drum 310 by the winding transport mechanism 320. The sensitive material is cut to a length designated by the operation panel 60 by a cutting device 330 provided in the middle of the winding transport mechanism 320. Drum 3
A high voltage is applied to 10 from a high voltage generator 315 (see FIG. 5), and when the drum 310 is rotated at a rotation speed corresponding to the transport speed of the sensitive material, electrostatic attraction causes
The sensitive material is sequentially adsorbed on the surface of the drum 310,
Is set on the outer circumference of. When the photosensitive material is adsorbed, the drum 31
0 rotates counterclockwise in FIG. 1, and when cutting and suction of the photosensitive material are completed, the photosensitive material 0 rotates and stops until the tip of the photosensitive material is positioned immediately before the exposure position. The drum 310 is the motor 34.
With 0, it is possible to rotate in both forward and reverse directions.

At the time of exposure, first, the document rack 50 is conveyed below the optical unit 200 and moved to the initial position. While the document rack 50 is being conveyed, the object side moving mirror unit 2
20 and the image side moving mirror unit 230 are moved to a position where a predetermined magnification is realized. From this state, drum 3
1 is rotated clockwise at a constant speed in FIG. 1, and at the same time, the original rack 50 is conveyed at a speed determined based on the set magnification. Note that the initial positions of the drum 310 and the document rack 50 require a predetermined time until the rotation speed and the transport speed reach a constant speed at the start of the rotation of the drum 310 and the transport of the document rack 50. It is supposed to be a position where you can afford. Except for the rotation of the drum 310, the winding transport mechanism 320, the discharge transport mechanism 360, etc. are driven by a single stepping motor 370 (not shown in FIG. 1).

When the tip of the photosensitive material reaches the peeling device 350 by the rotation of the drum 310, it is peeled from the drum 310 by a peeling claw (not shown), and is conveyed to the collecting box 305 by the discharging conveying mechanism 360. In this embodiment, the photosensitive material is collected in the collecting box 305 and is developed by the developing device installed elsewhere. However, the automatic developing device is connected to the drum unit 300 of the copying camera 20 and the developing is performed integrally. You can do it.

Copy camera 2 of the embodiment briefly described above
Each of these units of 0 is managed by the electronic control unit 30. The electronic control unit 30, as shown in FIG.
A well-known CPU 31 that executes logical operations, a ROM 32 that stores programs and data in advance, a RAM 33 that temporarily stores data and the like, a clock circuit 34 that generates an operation clock of the CPU 31, and the like are built-in, and an interface with the outside world is further provided. An input / output port 35, a stepping motor controller 36, etc. are provided. These respective circuits are connected to each other via a bus 30A.

The input / output port 35 is an input / output driver 35.
Via A, the first and second lamp units 204, 206
Besides, various external sensor groups 37 and high voltage generators 31
This is the circuit that governs the interface with 5. The input / output driver 35A drives the sensor group 37 and the lamp unit. An open / close signal of a switch incorporated in the high voltage generator 315 is output to the high voltage generator 315. Then, the high voltage generator 315 that receives this open / close signal opens and closes the switch based on the signal, and applies a high voltage DC voltage to the drum 310.

The CPU 31 reads the state of each part of the copy camera 20 via the input / output port 35 and the input / output driver 35A, and controls the turning on / off of the lamp unit as necessary. The stepping motor controller 36 includes stepping motor drivers 38 and 39.
Various motors are controlled via. To the stepping motor driver 38, the drive motor 252 of the object side moving mirror unit 220 and the drive motor 256 of the image side moving mirror unit 230 are connected. Further, the stepping motor driver 39 is connected with a stepping motor 102 for conveying the document rack 50, a drum driving motor 340, a stepping motor 370 for driving each part of the drum unit 300 such as a winding conveying mechanism 320, and the like. . Therefore, the CPU 31 freely activates / operates / drives each motor through the stepping motor controller 36.
You can stop.

Next, the outline of the exposure process, which is the main process executed by the electronic control unit 30, will be described. Normally, the electronic control unit 30 executes the exposure processing routine shown in FIG. In this routine, first, the key input from the operation panel 60 is read (step S400),
Various settings are made according to key input (step S41).
0). Various settings include, for example, selection of magazine A or magazine B, selection of light source, setting of magnification, setting of document length, object side moving mirror unit 220 according to the set magnification,
For example, the image-side moving mirror unit 230 is moved up and down.

After the various settings have been made, if the start key on the operation panel is pressed (step S42)
0), the process proceeds to S430, and the exposure process is performed by controlling the operation of each unit described above. That is, in this exposure process, the document rack 50 is conveyed, the sensitive material is wound by electrostatic attraction through the output of the switch-on signal (DC voltage application start signal) to the high voltage generator 315, and the lamp unit 20.
4 or 206 is turned on, exposure is performed (the document rack 50 and the drum 310 are synchronously driven), and the like. If the start key has not been pressed, the process returns to step S400 and the above-described processing is repeated from the key input from the operation panel.

As described above, in the copying camera 20 of this embodiment, the first mirror 211, the second mirror 212, the fifth mirror 215, and the sixth mirror 215 that move up and down along the vertical movement trajectory to change the optical path length. One main guide shaft 247 is used to hold the moving optical element of the mirror 216 up and down.
Is installed upright along this movement locus, and the main guide shaft 2
Two guide bushes 237A, 2 sliding along 47
By fitting 37B to the main guide shaft 247, the movable optical element is cantilevered on the main guide shaft 247 via the mirror holders 225 and 235. And
The optical element to be moved is cantilevered to the main guide shaft 24.
Follow along 7. At this time, the rotation of the optical element to be moved around the main guide shaft 247 is controlled by the sub guide shaft 24.
8. By regulating by the guide member 239, the movement target optical element can be guided along the main guide shaft 247 without rotating around the main guide shaft 247. In this case, since it is not necessary to adjust the parallelism or pitch between the main guide shaft 247 and the sub guide shaft 248 that regulates the rotation around the main guide shaft 247, the work of assembling the sub guide shaft 248 can be simplified. .

Then, both guide bushes 237 for cantilever supporting the optical element to be moved on the main guide shaft 247.
A force that acts on the mirror holders 225 and 235 holding the optical elements to be moved by adjusting the distance L between A and 237B to 180 mm (self-weight of each mirror holder peripheral member, driving force transmitted via the ball screw 246, etc.) Thus, the mirror holders 225 and 235 are prevented from being twisted. Therefore, by adjusting the distance L, the movement target optical element can be guided along the main guide shaft 247 while maintaining the posture with respect to the main guide shaft 247.

As a result, according to the copying camera 20 of the present embodiment, only one main guide shaft 247 is adjusted so as to stand upright along the movement locus of the vertically moving optical element.
A space L between the guide bushes 237A and 237B for supporting the moving target optical element on the main guide shaft 247 in a cantilever manner.
It is possible to raise and lower the movement-target optical element smoothly along the movement locus thereof while maintaining the posture with respect to the main guide shaft 247 only by performing the above adjustment. That is, according to the copying camera 20 of the present embodiment, the adjustment work necessary to obtain the proper vertical movement of the optical element to be moved is performed by adjusting only one main guide shaft 247 and both guide bushes 237A. It is possible to simplify the adjustment work such as the adjustment work of the interval L of 237B.

Moreover, the force acting on the mirror holders 225 and 235 (the weight of each mirror holder peripheral member, the driving force transmitted through the ball screw 246, etc.) is the same as the copy camera 2.
It is understood from the design stage of 0. Therefore, according to the copying camera of the present embodiment, both guide bushes 23 are designed at the design stage.
By setting the distance L between the 7A and 237B, adjustment of the distance L between the guide bushes 237A and 237B at the time of assembling can be omitted, and the load and labor of the assembling work can be reduced.

Further, in this embodiment, both guide bushes 23
When adjusting the distance L between 7A and 237B, the ball screw 2
In consideration of the moment generated based on the driving force transmitted via the ball screw 46, the ball screw 246 and the main guide shaft 2
The relational expression L ≧ l is established between the interval 1 between 47 and the interval L between the guide bushes 237A and 237B. Therefore, according to the copying camera 20 of the present embodiment, it is possible to more reliably obtain the above-described proper vertical movement of the movement target optical element.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment and can be implemented in various modes without departing from the scope of the present invention. Of course.

For example, the driving force obtained by vertically converting the rotational driving force of the motor by the ball screw 246, the ball nut 238 and the like is transmitted to the mirror holder 235. However, the lifting body 237 itself to which the mirror holder 235 is fixed. It is also possible to transmit the converted driving force to.

When adjusting the distance L between the guide bushes 237A and 237B in the lifting body 237, the distance is not limited to the above-described distance (180 mm), and the weight and size of the mirror holder 235 and the like are taken into consideration. Just select it. In this case, the gap 1 between the ball screw 246 and the main guide shaft 247 and both guide bushes 237A, 237
It is more preferable to adjust so that the relational expression L ≧ l holds with the interval L of B.

Furthermore, in the present embodiment, the moving direction of the optical element to be moved is the vertical direction, but the present invention is not limited to this, and it may be the horizontal direction.

[0056]

As described above, in the copying apparatus of the present invention, when moving the optical elements constituting the optical system to change the magnification, the optical elements are guided in parallel with the columns provided along the moving direction of the optical elements. A shaft is provided, and a sliding member having a plurality of sliding portions that slide along the guide shaft at predetermined intervals is fitted to the guide shaft. By doing so, the optical element is cantileveredly supported by the guide shaft via the optical element holding member. The rotation restricting member engaged with the optical element holding member regulates the rotation of the optical element holding member around the guide axis.

As a result, the drive force transmitted through the optical element holding member, the own weight of the optical element, and the support column can be obtained only by adjusting the predetermined interval of the sliding portion for supporting the optical element on the guide shaft in a cantilever state. It is possible to prevent the optical element from being twisted due to force or the like. Therefore, according to the copying apparatus of the present invention, the optical element can be moved smoothly and in a state in which the posture with respect to the guide axis is maintained. That is, according to the copying apparatus of the present invention, the adjustment work required to move the optical element in this way can be simplified to a simple adjustment work of adjusting a predetermined interval of the sliding portion.

[Brief description of drawings]

FIG. 1 is a front view of a copying camera that is an embodiment of the present invention and an explanatory view showing its configuration from the side.

FIG. 2 is a side view showing a configuration of an optical unit 200.

3 is an explanatory view of a main part of a mechanism for driving an image side moving mirror unit 230 as seen from the front of the copy camera 20. FIG.

FIG. 4 is a view on arrow AA in FIG.

5 is a block diagram showing a schematic configuration of an electronic control device 30. FIG.

FIG. 6 is a flowchart showing an outline of an exposure processing routine executed by the electronic control unit 30.

FIG. 7 is an explanatory diagram used for explaining the configuration of a conventional copying camera and its problems.

[Explanation of symbols]

 20 ... Slit exposure type copy camera (copy camera) 30 ... Electronic control device 40 ... Base body 50 ... Document rack 100 ... Document rack drive unit 200 ... Optical unit 202 ... Lens 220 ... Object side moving mirror unit 225 ... Mirror holder 226 ... Support member 227 ... Elevating body 230 ... Image side moving mirror unit 235 ... Mirror holder 236 ... Supporting member 236A ... Adjusting screw 237 ... Elevating body 237A, 237B ... Guide bush 238 ... Ball nut 239 ... Guide member 245 ... Ball screw 246 ... Ball screw 247 ... Main guide shaft 248 ... Sub guide shaft 252 ... Drive motor 256 ... Drive motor 300 ... Drum unit K ... Optical path

Claims (1)

[Claims] 1. An optical system for forming an image on a document on a recording material, and a drive means for moving an optical element constituting the optical system, the magnification being changed by the movement of the optical element. A copier for copying an image on the document onto the recording material, the pillar being provided along a moving direction of the optical element and converting a rotational driving force of the driving means into a driving force for moving the optical element. A guide shaft provided in parallel with the supporting column, an optical element holding member for holding the optical element, a member engaging with the supporting column and fitted to the guide shaft, and sliding along the guide shaft. A slide having a plurality of moving sliding parts at predetermined intervals, and moving the optical element holding member along the guide shaft by the driving force fixed to the optical element holding member and converted by the support post. A member and the optical element holding member A rotation restricting member that restricts rotation of the optical element holding member that moves along the guide axis around the guide axis, and a gap between the sliding portions maintains a posture of the optical element with respect to the guide axis. The copying apparatus, wherein the optical element holding member is adjusted so as to move along the guide shaft in this state.