JPH0452929B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a variable power optical system operating device for a copying machine such as an electrophotographic copying machine.

[Conventional technology]

The optical system of a variable-magnification copying machine, for example, as shown in Figure 1, reflects light from an original 2 on an original platen glass surface 1 through a first mirror 3 and a second mirror 4, and then through an in-mirror lens (in the case of a through-lens). The reflected light from the in-mirror lens 5 passes through the third mirror 6 and forms an image on the photoreceptor surface 7. However, when changing the magnification, the in-mirror lens 5 and the second mirror 4 must be changed. It must be accurately moved to a predetermined position in the directions of arrows A and B according to the magnification. In this case, the amount of movement between the lens and the mirror is not the same, and as to how to make this difference, as described in Japanese Utility Model Publication No. 11084/1984, the lens slide frame and the mirror slide frame are placed on the same plane. Since they were arranged side by side and slidably fitted to different parts of the same shaft on one side, they had the disadvantage of requiring a large installation space, and the movement of the lens slide frame was moved to the mirror slide frame. The transmission means includes a "cam" fixed to the other side of the lens slide frame, and an "L-shaped lever" whose one end is in sliding contact with the cam and the other end is pivoted to a bushing on the shaft fitting side of the mirror slide frame. Since it was composed of a "spring member" that was biased so that one end of the L-shaped lever slid into contact with the cam, the "L-shaped lever" was large enough to straddle the sliding area of both frames, and it itself It was heavy and therefore slow in movement, and had the disadvantage of not being able to sensitively transmit the movement of one to the other.

[Purpose and structure of the invention]

This invention is intended to solve the above-mentioned conventional problems.The lens slide frame is shaped and the mirror slide frame is shaped, and they are slidably fitted to the same shaft so that the groove sides engage with each other, thereby reducing the installation space for both frames. A spring member that acts in the expansion direction is interposed between the opposing inner frames of both frames, and the movement of the lens slide frame in the forward and reverse directions can be transmitted to the mirror slide frame by the action of the spring member. The L-shaped lever is large enough to straddle both frame rods and is slidably fitted to the same shaft so that the groove sides engage with each other, and a curved cam that operates the L-shaped lever. It is an object of the present invention to provide a variable magnification optical system operating device for a copying machine which defines the movement of both frames during magnification change and sensitively transmits the movement of one to the other.

〔Example〕

Next, the present invention will be explained based on an embodiment shown in the drawings from FIG. 2 onwards. Note that the same parts as in FIG. 1 are indicated by the same reference numerals.

10 and 11 are front and rear side plates 13 of the unit frame 12,
Two parallel shafts are provided near both ends of the shaft 14, and a shape slide frame 15 and a shape slide frame 16 are slidably fitted to one of the shafts 10 so that the groove sides of the frame 15 and 16 are engaged with each other. ing. Further, on the other shaft 11, the other end of the lens base plate 17 whose one end is fixed to the shaped slide frame 15 and the other end of the mirror frame 18 whose one end is fixed to the shaped slide frame 16 are mounted on rollers 19, respectively. 2
It is designed to slide through 0.

A second mirror 4 is attached to the rear surface of the mirror frame 18 that moves integrally with the slide frame 16,
Lens base plate 17 integrated with the slide frame 15
An in-mirror lens 5 is attached to the front surface of the mirror lens 5 via a movable plate 22 that can be moved in the plane direction using a pin 21 as a fulcrum.

A wire 23 is stretched between two pulleys 24 and 25, and both ends of the wire are connected to the slide frame 15.
The shaped slide frame 15 slides along the shaft 10 by driving the pulley 24 in forward and reverse directions by a drive motor (not shown).

Reference numeral 26 denotes a spring member interposed so as to expand between the inner frames 15a and 16a of the slide frame 15 and the slide frame 16, and the spring member 26 is a coil-shaped member that fits into the shaft 10. ,
The shape slide frame 15 is pressed forward (to the right) and the shape slide frame 16 is pressed backward (to the left). 28 is a shaft rod 27 placed in the appropriate position of the slide frame 15.
The L-shaped lever is rotatably attached via the
The horizontal arm 28a of the shaped lever 28 has its tip roller 29.
The vertical arm 28b is in sliding contact with the curved cam 30 installed on the bottom plate of the unit frame 12, and the vertical arm 28b is connected to the rear edge of the protrusion 32 protruding from the slide frame 16 via the tip roller 31 of the spring member 28b. is in contact against the elastic force of. Therefore, when the slide frame 15 for moving the mirror lens 5 moves forward by being pulled by the wire 23, the tip roller 31 of the vertical arm 28b of the L-shaped lever 28 moves against the protrusion 32.
, the slide frame 16 for moving the second mirror 4 moves forward against the spring member 26. In this case, the amount of movement La of the sliding frame 16 is determined by the L-shaped lever 28 as shown in FIG.
The horizontal arm 28a of the curved cam 3 in the process of movement.
Since it rotates counterclockwise by 0, the amount of rotation l becomes smaller than the amount of movement Lb of the shaped slide frame 15. Also, when the shaped slide frame 15 slides backward from the reference point, the shaped slide frame 16 moves backward by the elastic force of the spring member 26, but the L-shaped lever 28 is clockwise moved by the curved cam 30. It decreases by the amount of rotation in that direction. Next, the operation of the above embodiment will be explained.

The slide frame 15 for moving the in-mirror lens 5 and the slide frame 16 for moving the second mirror 4 have their initial positions set at the same-magnification copying position, and move forward or backward from their initial positions when changing the magnification. Therefore, the in-mirror lens 5 and the second
When the copy start button is pressed with the mirror 4 in the above-mentioned initial position, the document table glass moves together with the document, and the reflected light emitted from the light source lamp and reflected on the document surface is reflected by the first mirror 3, second mirror 4, The image is formed on the photoreceptor 7 through the in-mirror lens 5 and the third mirror 6. In this case, the tip roller 29 of the horizontal arm 28a of the L-shaped lever 28, which is rotatably attached to the slide frame 15 for moving the in-mirror lens 5, is located at approximately the midpoint of the curved cam 30 relative to the in-mirror lens 5. The distance between the second mirrors 4 is maintained.

Next, when making a reduced copy, press the setting button to specify the magnification, and the drive motor is driven to slide the shaped slide frame 15 along the shafts 10 and 11, moving the in-mirror lens 5 forward ( (rightward in the figure) by the required amount according to the magnification ratio. With this movement of the sliding frame 15, the tip roller 31 of the vertical arm 28b of the L-shaped lever 28 moves the sliding frame 16 in the same direction against the spring member 26.
Since the horizontal arm 28a of the shaped lever 28 is rotated counterclockwise by the curved cam 30 during the movement process,
The amount of movement of the shaped slide frame 16 is limited by the amount of rotation l. In other words, the amount of movement of the second mirror 4 with respect to the in-mirror lens 5 is adjusted.

Also, when making an enlarged copy, when you press the setting button and specify the magnification, the drive motor is driven to move the shape slide frame 15 backward (to the left in the figure) along the shafts 10 and 11, and this shape slide As the frame 15 moves, the slide frame 16, which was in contact with the tip roller 31 of the vertical arm 28b of the L-shaped lever 28 due to the elastic force of the spring member 26, also moves in the same direction, but the L-shaped lever 28 moves in the same direction. During the movement of the horizontal arm 28a, the curved cam 30 rotates the horizontal arm 28a clockwise, so the movement of the slide frame 16 is suppressed by the amount of rotation 1, and the amount of movement of the second mirror 4 is adjusted.

When the copying magnification is further changed, the same operation as above is repeated, and the in-mirror lens and the second
It becomes possible to accurately move the mirror to a variable magnification position corresponding to the set magnification. In the above embodiment, the mirror frame is moved in conjunction with the movement of the lens frame, but the opposite may be used, that is, the lens frame may be moved in conjunction with the movement of the mirror frame.

〔Effect of the invention〕

As described above, according to the present invention, the lens slide frame is formed into a shape, and the mirror slide frame is formed into a shape, and they are slidably fitted onto the same shaft so that the groove sides engage with each other, and between the opposing inner frames of both frames. By interposing a spring member that acts in the expansion direction, the mirror slide frame is configured to follow the movement of the lens slide frame in the forward and reverse directions, and
L rotatably attached to the appropriate position on the lens slide frame
One end of the shaped lever is in sliding contact with a curved cam provided along the sliding direction, and the other end is connected to a part of the mirror slide frame, so the installation space for both frames can be made compact, and
The mechanism that can transmit the forward and reverse movement of the lens slide frame to the mirror slide frame can be simplified. Furthermore,
Since the L-shaped lever that connects both frames is small, the movement of one frame when changing magnification can be sensitively transmitted to the other frame, resulting in various excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a variable magnification copying machine, Fig. 2 is a partially cutaway perspective view of an optical system unit showing an embodiment of the invention, Fig. 3 is a side sectional view, and Fig. 4 is a perspective view of the main parts. FIG. 5 is an explanatory view showing the operation of the L-shaped lever. 10, 11...shaft, 15... type slide frame (lens slide frame), 16... type slide frame (mirror slide frame), 26... spring member,
28...L-shaped lever, 28a...horizontal arm (one end),
28b...Vertical arm (other end), 29, 31...Tip roller, 30...Curved cam, 32...Protrusion.

Claims (1)

[Claims] 1 A spring member shaped into a lens slide frame and a mirror slide frame, slidably fitted to the same shaft so that the groove sides engage with each other, and which acts in the expansion direction between the opposing inner frames of both frames. By interposing the lens slide frame, the lens slide frame is configured to follow the movement of the lens slide frame in the forward and reverse directions, and one end of the L-shaped lever is rotatably attached to the appropriate position of the lens slide frame. A variable magnification optical system operating device for a copying machine, characterized in that the variable magnification optical system operating device for a copying machine is brought into sliding contact with a curved cam provided along a sliding direction, and the other end is connected to a part of a mirror slide frame.