JPS6279436A - Optical movement type exposure device - Google Patents

Abstract

PURPOSE:To make an exposure device compact by interposing a spring clutch which operates in a clamping direction with natural falling force based upon a component of gravitational force of an optical element in a driving system which moves down the optical element on the side of the driven-side optical element. CONSTITUTION:When the driving for the backward motion (b) or forward motion (a) of a mirror case 15 as a moving optical element is stopped, the natural falling force based upon a component of gravitational force of the driven-side mirror case 15 operates on a shaft 40 for forward movement as a force which rotates it clockwise, and consequently the clutch spring 48 clamps the boss part 41a of a power take-off gear 41 and a ring member 42 united with the shaft 40. Namely, the driven side and driving side are linked together and the natural falling force based upon the component of gravitational force of the driven mirror case 15 is supported by the rotary drag of the driving source side, so that the mirror case 15 is stopped and held stably at a halfway position on a slanting guide member without falling naturally.

Description

[Detailed description of the invention] B. Purpose of the invention [Industrial application field] The present invention relates to an optical system moving type exposure apparatus.

More specifically, the present invention relates to an optical system moving type exposure apparatus that includes an optical element that is driven to move forward and backward in a descending direction and an ascending force direction by a drive system along an inclined or non-horizontal guide member.

[Conventional technology]

For convenience, a microfilm printer will be described as an example in which a frame image of a microfilm is scanned through a moving optical exposure device such as the one described above, and enlarged and projected onto a photoreceptor to obtain a copy.

In Figure 4, ■ is the microfilm, 2 is the lamp 3
- An illumination unit consisting of a reflection plate 4, a condenser lens (condenser lens) 5, etc., and the required frame image tfffi of the microfilm l is searched and positioned at the illumination position 6. 7 is an imaging lens; 8 to 10 are first to third mirrors; 12 is a photosensitive drum rotated at a predetermined circumferential speed in the direction of the arrow; 11
is a slit plate disposed at the slit exposure position 13 of the drum to block excess light. Photosensitive drum 12 (7
) Image forming process equipment such as electrophotography is installed in the surrounding area, but is omitted from Figure 1.

This device converts the light transmitted through the imaging lens 7 of the microfilm frame image into the first mirror 8 → second mirror 9 → third mirror lO.
→The light is guided to the slit exposure section 13 of the photosensitive drum 12 through the path of the slit plate 11. The first mirror 8 is a fixed mirror, the second mirror 9 and the third mirror 10 are movable scan mirrors, and The mirrors 9 and 10, etc., form an optical path from the first mirror 8 to the second mirror 9, and an optical path in which the light incident from the second mirror 9 to the third mirror 10 is reflected by the $3 mirror 10 and reaches the photosensitive drum 12. They are arranged and accommodated in a mirror case 15 serving as a common support member such that they intersect 14 and face each other at an included angle of 45°. The mirror case 15 is tilted (in the case of this example device, 4 degrees with respect to the horizontal direction).
The drive system moves forward (forward movement) in the downward direction along the guide member tilted at 5 degrees (Af), and conversely moves backward (in the upward direction).
backward movement) b.

5 and 6 are schematic diagrams of the drive system of the mirror case 15, and 16 and 17 are fixed to immovable members of the device as movement guide members of the mirror case 15, parallel to each other and at an angle of 45 degrees with respect to the horizontal direction. The guide rod on the front side and the rail on the back side are arranged at an angle. The mirror case 15 is supported on the front side by the passage of the guide rod 16, and on the rear side by receiving the roller 18 provided on that side on the rail 17, and is supported by the inclined guide rod 16 and the rail. 17
It is free to move smoothly in the downward direction a and in the upward direction.

19 is a stationary drive pulley that is driven forward and backward by a drive mechanism (not shown); 20 and 21 are stationary driven pulleys disposed at the lower and upper ends of the inclined guide rod 16, respectively; 22 is the drive pulley 19 described above; This is a tension wire that is suspended around driven pulleys 20 and 21, and both ends 22a and 22a are fixed to the front outer end surface of the mirror case 15 and stretched without slack. A plurality of wires are wound around the drive pulley 19 to prevent the wire from slipping. Therefore, as the drive pulley 19 is driven in the forward direction A, the mirror case 15, which is a moving optical element, is moved forward in the downward direction along the inclined guide members 16 and 17 via the pull wire 22, and conversely, as the drive pulley 19 is driven in the reverse direction, it is moved forward in the downward direction. It will not move backwards in the upward direction. Reference numerals 23 and 24 denote a forward end point stopper portion and a reverse end point stopper portion of the mirror case 15, which are provided on the lower end side and the upper end side of the guide rod 16.・Moves backwards. The mirror case 15 normally waits at its home position at the position where it has been completely lowered until it is received by the forward end point stop/pa part 23 on the lower end side of the inclined guide rod 16.

Then, when the desired frame image portion of the microfilm l is located at the illumination position 6 and the copy button (not shown) is pressed,
The drive pulley 19 is driven in the reverse direction B, and the mirror case 1
5 moves backward in the upward direction along the inclined guide members 16 and 17, and when it reaches the backward movement end point stopper part 24 and is stopped, it is detected by a sensor (not shown), and the signal causes the drive pulley 19 to move backward. The mirror case 15 is turned into a forward movement A in a downward direction along the inclined guide members 16 and 17. Mirror case 15 is photosensitive drum 1
forward movement aL toward the forward end point stopper portion 23 at a predetermined constant speed synchronized with the rotation of No. 2;

During the forward movement process, the second mirror 9 in the mirror case 15 scans the microfilm frame image light that has passed through the imaging lens 7 and has been changed in optical path by the first mirror 8 toward the second mirror 9. The surface of the photosensitive drum 12 is scanned by the third mirror 10 receiving the scanning light, and enlarged projected images of the film frame images are sequentially guided through the slits onto the surface of the rotating photosensitive drum 12, and copying is executed.

The entire scanning of the film frame image light is completed before the mirror case 15 reaches the home position, that is, the forward end point stopper section 23, and when the mirror case 15 reaches the forward end point stopper section 23 and is received, it is It is detected by a sensor (not shown), and the normal rotation drive A of the drive pulley 19 is stopped in response to the signal, and the mirror case 15 enters the standby state at the home position until the next copying.

Slit exposure of the film frame image light onto the rotating photosensitive drum 12 can also be performed during the backward movement sb of the mirror case 15. The home position of the mirror case 15 is set to a position where it is fully raised until it is received by the backward movement end point stopper part 24 on the upper end side of the inclined guide rod 16, and from that position the mirror case 15 moves forward a until it reaches the forward movement end point stopper part. 23, and then reverses and moves backward to return to the home position. In the process of the forward movement a of the mirror case 15 or in the process of backward movement, the slit exposure of the film frame image light to the rotating photosensitive drum 12 is performed. You can also make it happen.

[Problem that the invention seeks to solve]

As opposed to the device (first method device) in which the moving optical element 15 is driven forward and backward in the downward and upward directions along the inclined guide member, the moving optical element 15 is moved forward and backward in the horizontal direction. There is also a device (second method device) that drives backward movement, and FIG. 7 is an example of this. Reference numerals 25 and 26 are first and second mirrors as moving optical elements, and both mirrors have a common mirror. The movable support member 27 is firmly attached and held so that it faces the movable support member 27 with an included angle of 90° with the reflecting surface facing diagonally downward. The movable support member 27 is moved forward to the left (a) and backward to the right by a drive system along a horizontal guide member (not shown) at a predetermined speed. In the process of forward movement a or backward movement, the light transmitted through the imaging lens of the film frame image is scanned by the first mirror 25, and the surface of the photosensitive drum 12 is scanned by the second mirror 26, causing the photosensitive drum 12 to rotate once. Enlarged projected images of film frame images are sequentially exposed to slit light on the surface, and copying is executed.

In contrast to the second method, the first method device can make the entire device more compact because the scanning mirror as a moving optical element is smaller, and the angle of incidence of light is acute, which is advantageous for the surface accuracy of the mirror. It has the following advantages.

However, in the case of the first type device, the natural downward movement force along the inclined guide members 16 and 17 due to the force of the own weight of the moving optical element 15 acts constantly, so the configuration of the drive system should be appropriately designed in consideration of this. There is a need.

Specifically, in the case of the second type device, the clutch device of the drive system that moves the moving optical element 27 forward and backward along the horizontal guide member does not have a natural moving force due to the force of the own weight of the moving optical element, so this should be taken into consideration. You can design without However, in the case of the first type device, the structure of the drive system must be appropriately designed to cancel the natural downward movement force along the inclined guide members 16 and 17 due to the force of the moving optical element 15's own weight.
Forward movement a of the moving optical element in the downward direction along the inclined guide member
In the process, acceleration due to the above-mentioned natural downward movement force of the moving optical element itself is added to the forward movement speed, and the rotation peripheral speed of the photosensitive drum 12 becomes out of synchronization.

The synchronization deviation causes distortion in the imaged image. Since it accelerates until it stops at the stopper portion 23 at the end of its descent, a large impact occurs when it stops. The clutch device in the drive system that switches the moving optical element 15 between forward motion and backward motion becomes difficult to operate smoothly and reliably due to the effect of the natural downward movement force of the moving optical element acting on the clutch device. When the power is turned off in the middle of the forward movement a or backward movement of the moving optical element, the clutch device becomes inoperative, and the moving optical element 15 is not stopped and held at the position in the middle of its movement, and its own natural downward movement force This causes problems, such as accelerating and descending along the inclined guide members 16 and 17, and being impacted by the stopper portion 23 at the end of the descent.

As a means for canceling the natural downward slope of the moving optical element 15 along the inclined guide members 16 and 17, for example, the pulling wire 22 on the side that pulls up and moves the moving optical element 15 along the inclined guide members 16 and 17, A weight 28 (two-dot chain line in FIG. 5) whose weight almost balances the natural downward force of the moving optical element 15 is attached to the wire portion between the driven pulley 21 and the driving pulley 19.
A configuration (hanging structure) in which a holder is added is conceivable, but this imposes restrictions on the arrangement and prevents miniaturization of the entire device.

The present invention relates to the first type of apparatus as described above, that is, an optical system moving type exposure apparatus of a type in which the moving optical element 15 is driven to move forward and backward in the downward direction and upward direction along the inclined guide members 16 and 17. It is an object of the present invention to rationally eliminate various problems caused by the natural downward movement force along the inclined guide members 16 and 17 due to the force of the moving optical element 15's own weight.

1. Structure of the Invention [Means for Solving Problems] The present invention provides an optical system moving type exposure apparatus including an optical element that is driven to move in a descending direction and an ascending direction by a drive system along an inclined guide member. , a drive system that moves the optical element in the downward direction along the inclined guide member, and the optical element side, which is the driven side, is tightened by the natural downward movement force along the inclined guide member due to the force of its own weight. The object of the present invention is to provide an optical system moving type exposure apparatus, which is characterized in that a spring clutch is interposed on the drive source side to bring it into a connected state.

[For production]

The movement of the moving optical element in the upward direction along the inclined guide member is caused by the driving force of the drive system that performs the movement, against the natural downward movement force (passing force) due to the force of the moving optical element's own weight. It is carried out at a predetermined speed according to the following.

The movement of the movable optical element in the downward force direction along the inclined guide member is performed by a spring clutch, which is interposed in the drive system that accompanies the movement, by the natural downward movement force along the inclined guide member due to the force of the optical element's own weight. The winding is tightened, and the optical element side, which is the driven side, is connected to the drive source side, and the natural downward movement along the inclined guide member due to the force of the optical element's own weight is caused by the rotational drag (self-rotation restraining force) on the drive source side. ), and as a result, it is carried out at a predetermined speed according to the driving force of the driving source.

The on/off control link of the spring clutch is designed to tighten the spring clutch when the control is off, so that the driving source can be used while the optical element is moving in the upward or downward direction along the inclined guide member. Even if the 'ilt source of the control system is turned off, the moving optical element tends to slide downward along the inclined guide member due to the natural downward movement force due to the force of its own weight. The downward movement force causes the winding to tighten, and the optical element side, which is the driven side, becomes connected to the drive source side, which is in a stopped state, via the spring clutch. As a result, the natural downward movement force along the inclined guide member due to the force of the optical element's own weight is supported by the rotational resistance on the drive source side in the stopped state (for a kind of engine brake-like braking action on the drive source side in the stopped state). The optical element that is in the middle of movement is stably stopped and held at the movement position in the middle of the inclined guide member when the drive source and control system power is turned off.
Natural sliding movement is prevented.

〔Example〕

FIG. 1 shows the above-mentioned drive pulley 19 being rotated in the forward direction AΦ reverse rotation vJ.
FIG. 2 is a front view of a forward/reverse clutch mechanism section 100 of a drive system that performs B. 39 and 49 are the reverse gear and the forward south gear,
They mesh with each other. 50 is a relay gear (idler gear) that is meshed with the forward gear 49, 51 is an output wheel that is meshed with the relay gear, and the output south-1 is coaxial with the drive pulley 19 and is connected to the drive pulley 19. It meshes with the southeast 19a, which is integrated with the river.

As a result, the gear 19a, that is, the drive pulley 19, undergoes forward rotation A and reverse rotation B in conjunction with the forward rotation A1 and reverse rotation B1 of the output vehicle 51 accompanying the switching operation described later of the clutch mechanism 100. The mirror case 15, which is a moving optical element, is moved forward in the downward direction a and backward in the upward direction along the inclined guide members 16 and 17 via the pull wire 22.

FIG. 2 is an enlarged longitudinal sectional front view of the main parts of the forward/reverse clutch mechanism section 100, and FIG. 3 is an enlarged longitudinal sectional plan view. Sl・S2
30 and 40 are a pair of parallel vertical side plates (chassis side plates) in the front and rear, and 30 and 40 are a pair of left and right shafts that are supported by bearings for free rotation in parallel with each other between the two side plates S1 and S2, the left side is the reverse shaft and the right side is the This is the forward shaft. D is the bearing of those shafts 30 and 40.

31 is a power transmission gear loosely fitted on the reverse shaft 30;
2 is a ring member that is press-fitted into the shaft 30 and integrated with the shaft; 33 is a cylinder holder that is loosely fitted on the shaft 30; 34 is a claw type that is loosely fitted on the outside of the cylinder holder; 34a;
35 is a donut-shaped criction plate interposed between the flange 33a of the tube holder 33 and the end face of the nail shape 34, and 36 is a stopper ring plate fixed to the tube holder 33. It is. 37 is the stoppering plate 3
6 is a coil spring that is compressed between the end face of the low weight 34 on the friction plate 35 side and the opposite side, and the tensile force of this spring 37 causes the low weight 34 to be pushed through the friction plate 35 to the flange of the cylinder holder 33. 33a is constantly kept in a suppressed state. 38 is the boss portion 31 of the power taking gear 31;
a and a ring member 32 integrated with the shaft 30. Both ends 38a of the spring are connected to the side surface of the power-taking gear 31 and the cylinder holder 33, respectively. Notch groove 31 on the side surface of the flange 33a
Hook it on b-33b and lock it. The above-mentioned reverse gear 39 is press-fitted into the tip of the reverse shaft 30 and is integrally attached and supported.

41 is a power-taking gear loosely fitted to the forward shaft 40;
2 is a ring member press-fitted into the same shaft 40 and integrated with the shaft, 43 is a cylinder holder loosely fitted on the same shaft 40, 44 is a claw +lt loosely fitted on the outside of the cylinder holder, 4
4a is a claw carved on the outer periphery of the low weight, 45 is a simple holder 4
A donut-shaped friction plate 46 is interposed between the flange 43a of No. 3 and the end face of the low weight 44, and 46 is a stoppering plate fixed to the cylinder holder 43. 47 is a coil spring that is compressed between the stopper ring 46 and the end face of the low weight 44 opposite to the friction plate 45 side, and the tension of this spring causes the low weight 44 to be moved through the friction plate 45 to the cylinder holder. 43 is kept in a pressed state at all times. 48 is a boss portion 41a of the power taking gear 41;
It is a coil type clutch spring fitted to the outer periphery of both the shaft 40 and the integral ring member 42, and one of the both ends 48a of the spring is hooked and locked on the cylinder holder 43 side, and the other is It is hooked and locked onto the ring member 4z side that is integrated with the shaft 40. The aforementioned forward gear 41 is attached to and supported at the tip of the forward shaft 40 integrally with the shaft.

Gl (Figure 2) is a drive gear that is pivotally supported inside the back side plate S2, and is driven in the direction of the arrow by a motor (not shown) serving as a drive source via a reduction gear mechanism (not shown) as necessary. Rotationally driven. G2 is a relay gear similarly supported by the side plate S2, and the drive gear G1. The three power take-offs 31 and 41 (FIG. 3), which are loosely fitted into the reverse shaft 30 and the forward shaft 40, respectively, are in mesh with each other.

Reference numeral 60 (FIG. 2) is a clutch lever that can freely swing around a shaft 61 fixed to the side plate S2, which operates the first to third three-piece arms (arm portions) 60□, 6021+603. 62 is a pin shaft embedded in the side plate S2, 63 is a tension spring stretched between the pin shaft and the first arm 601 of the lever 60, and the lever 60 is always centered around the shaft 61 by the tension of this spring 63. is urged to rotate counterclockwise. Reference numeral 64 denotes an electromagnetic solenoid Φ plunger device (SL device) mounted and supported on the side plate S2, and the tip of the advance/retreat plunger 64a of the SL device and the second arm 602 of above-mentioned 8-60.
and are connected by a link 65. The third arm 603 of the lever 60 is extended between the low weight 34 on the reverse shaft 3O side and the low weight 44 on the forward shaft 40 side, and the low weight on the reverse shaft 30 side is inserted in the middle. A retaining claw portion 66 corresponding to and opposing the outer peripheral claw portion 34a of 34 is attached to the tip portion i.
Each of them is provided with an engaging claw portion 67 that corresponds to and opposes the outer circumferential claw portion 44a of the low weight 44 on the TA shaft 40 side.

When the SL device 64 is de-energized, the lever 60 is moved by the spring 63.
The third arm 603 of the lever 60 is rotated counterclockwise around the shaft 61 by the tensile force of , as shown by the solid line in FIG.
The engaging claw portion 67 at the tip engages with the outer peripheral claw portion 44a of the low weight 44 on the forward movement shirt 40 side, and the engaging claw portion 66 at the middle
is maintained in a state of non-engagement with the outer circumferential claw portion 34a of the low weight 34 on the side of the backing shirt) 30. When the SL device 64 is energized, the forward and backward plunger 64a of the SL device 64 moves backward into the solenoid 64b, so that the lever 60 is moved by the spring 6.
The engaging claw portion at the tip of the third arm 603 of 8-60 is rotated clockwise around the shaft 61 against the tensile force of 3, and opposite to the above, as shown by the two-dot chain line. 67 is not aligned with the outer circumferential claw portion 44a of the wind turbine 44 on the side of the winding shaft 40,
The retaining claw part 66 in the middle part is connected to the wind turbine 3 on the reverse shaft 30 side.
4, and this state is maintained.

Next, the operation will be explained.

The mirror case 15, which is a moving optical element, is normally stopped at a home position, that is, at a fully lowered position until it abuts and is received by the forward end point stopper portion 23 on the lower end side of the inclined guide rod 16. The SL device 64 is normally in a non-energized state.

(0) When the main power switch (not shown) of the device is turned on in this state 8, rotational driving of the motor (not shown) is started.

The drive gear Gl (Fig. 2) rotates in the direction of the arrow by the drive of the remoter, and the reverse shaft 3 is rotated through the relay gear G2.
Same as the power take-off gear 31 on the 0 side and the forward shaft 40 side
1 is in a rotating state.

(2) The rotational force of the power gear 31 on the reverse shaft 30 side is transmitted to the cylinder holder 33 via the clutch spring 38.

In this case, the windmill 34, which is pressed against the core holder 33 via the friction plate 35, is stopped from rotating because the engagement claw 66 on the clutch lever 60 side is not engaged with the claw 34a on the outer peripheral surface of the windmill 34. Therefore, the force that tightens the boss portion 31a of the power take-up gear 31 and the ring member 32 that is integrated with the shaft 30 does not substantially act on the clutch spring 38 (clutch-off). The rotational force of the power gear 31 is not transmitted to the reverse gear 39, and the power gear 31, clutch spring 38,
A cylinder holder 33 including a windmill 34 idles around the shaft 30.

- On the male advancement shaft 40 side, the engaging claw part 67 on the lever 60 side is engaged with the outer peripheral claw part 44a of the windmill 44 attached to the cylinder holder 43 on this shaft side, so that the windmill 44
The mirror case 15 on the driven side is in contact with and received by the forward end point stopper part 23, and the mirror case 1 acting on the tension wire 22 is stopped from rotating.
The natural downward movement force along the inclined guide members 16 and 17 due to the self-weight force of No. 5 is zero, and therefore, based on the natural downward movement force, the wire 22 → pulley 19 → south wheel 19a → same 51 → same 5
0 → Since the rotational force acting on the forward shaft 40 through the clutch spring 49 in the direction of tightening the clutch spring 48 is zero, The clutch spring 48 is not tightened around the ring member 42 (clutch-off).

Therefore, only the power gear 41 idles around the forward shaft 40, and the rotational force of the power gear 41 is not transmitted to the forward shirt 40 and the forward gear 49 integrated therewith.

[2] In the state described above, when the SL device 64 is energized based on the mirror box reverse drive command signal from the control circuit, the outer claw portion 3 of the wind turbine 34 on the reverse shaft 30 side
4a is engaged with the engaging claw portion 66 on the lever 60 side (as shown by the two-dot chain line in FIG. 2), and the wind turbine 34 is rotated IF. - The engagement claw portion 66 on the lever 60 side escapes from the outer peripheral claw portion 44a of the windmill 44 on the male advancement shaft 40 side and disengages, thereby releasing the rotation stop of the windmill 44.

Due to rotation stoppage by the engaging claw portion 66 of the wind turbine 34 on the reverse shaft 30 side, a load (rotational resistance) is applied to the rotation of the cylinder holder 33 due to the pressing force of the coil spring 37 and the frictional force of the friction plate 35. Then, the clutch spring 38 is connected to the boss portion 31a of the power transmission gear 31 and the shaft 3.
A tightening force is applied to the ring member 32 integral with the first winding (clutch-on), and by tightening the first winding, the power take-up gear 31 and the shaft 30 are integrated, and the shaft 30 and the reverse gear 39 integral therewith are connected to the first In the figure, it is rotated clockwise. The cylinder holder 33 rotates together with the shaft 30 while slipping through the friction plate 35 with respect to the windmill 34 which is stopped from rotating.

Thus, the rotational force of the reverse gear 39 is transferred to the forward gear 49→
Transmission is transmitted from the relay gear 50 to the southeast 19a integral with the drive pulley 19 via the output gear 51, and the drive pulley 19 is rotationally driven in the B direction.
・A backward movement in the ascending direction along line 17 is performed.

On the other hand, the forward gear 49, which is integral with the shaft and meshes with the reverse gear 39, is driven to rotate in the counterclockwise direction in FIG. The rotation direction of the gear 41 is opposite to that of the gear 41). The rotational force of the shaft 40 is transmitted to the tube holder 43 via a ring member 42 that is integral with the shirt 40 and a clutch spring 48 that connects the ring member 42 and the tube holder 43. However, the direction of rotation is opposite to the direction in which the clutch spring 48 tightens the ring member 42 and the boss portion 41a of the power-taking gear 41, and the low weight that is pressed against the cylinder holder 43 via the friction plate 45 44, the engaging claw portion 67 on the clutch lever 60 side is not engaged with the claw portion 44a on the outer circumferential surface of the clutch lever 44 and is not stopped from rotating. Therefore, the spring clutch connection between the shaft 40 and the power transmission gear 41 does not occur. First, the cylinder holder 43 including the shaft 40, the ring member 42, the clutch spring 48, and the low weight 44 rotates together in the driven rotation direction of the forward gear 49, and the power take-up gear 41 rotates around the shaft 40. It is in a state where it is rotating in the opposite direction.

- When the mirror case 15 rises until it contacts and is received by the reverse end stopper portion 24, this is detected by a sensor, and the communication to the SL device 64 is cut off based on the mirror box forward drive command signal.

As a result, the clutch lever 60 is rotated counterclockwise around the shaft 61 by the tensile force of the spring 63, and the rotation stop by the clutch lever pawl 66 of the low weight 34 on the backing shirt 30 side is released. . - The low weight 44 on the side of the male advancement shaft 40 is stopped from rotating by a clutch lever 8 pawl portion 67.

When the rotation stop of the low weight 34 on the reverse shaft 30 side is released, the tightening force of the clutch spring 38 against the boss portion 31a of the power take-up gear 31 and the ring member 32 integrated with the shaft 30 is loosened (clutch- OFF), the edge between the power-taking gear 31 and the shaft 30 is cut.

On the other hand, on the forward shaft 40 side, rotational resistance is applied to the cylinder holder 44 due to the rotation of the low weight 44, and a natural downward force due to the self-weight component of the mirror case 15, which is the driven side with respect to the shaft 40. acts as a force to rotate the shaft 40 in the clockwise direction in FIG.
8 is the boss portion 41a of the power-taking gear 41 and the shaft 40
and the ring member 42 integral with the shaft 40. A forward gear 49, which is integral with the shaft, is rotated clockwise in FIG. 1 integrally with the power take-off gear 41.

The tube holder 43 rotates together with the shaft 40 while slipping via a friction plate 45 against a low weight 44 that is stopped from rotating.

Thus, the rotational force of the forward gear 49 is transferred to the relay gear 40→
Output pulley 51 → drive pulley 1 via boolean gear 19a
9, the drive pulley 19 is rotated in the forward direction A, and the mirror case 15 is rotated downward along the inclined guide members 16 and 17 at a predetermined rotational drive speed of the power take-up gear 41 on the forward shaft 40 side. It moves forward at a speed of a.

During this time, the reverse shaft 30 receives a driven rotational force in the counterclockwise direction in FIG. 1 from the forward gear 49 via the reverse gear 39; Since the shirt 30 is in the clutch-off state, the shirt 30 simply performs the above-mentioned driven rotation, and the power take-up gear 31 idles around the shaft 30 in the opposite direction.

(When the Φ mirror case 15 reaches the home position, that is, the end point of forward movement, and is abutted against and received by the stopper part 23, the forward movement shaft 40r: the self-weight of the mirror 7-s 15, which is the driven side, is acting). The natural descending force due to component force becomes zero, and the tightening force of the clutch spring 48 against the ring member 42 integrated with the boss portion 41a of the power take-up gear 41 and the shirt) 40 becomes slack (clutch-off), and the power take-up gear 41 and the shaft 40 are cut, and the shaft 4
0 stops rotating, and the mirror case 15 is in a standby state at the home position until the SL device 64 is energized by the next reverse command signal.

(F) In the process of moving the mirror case backward in step (2) above, when the device power is turned off, the drive of the motor is stopped and the power to the milk device 64 is turned off, and in the process of moving the mirror case forward in step (a) of step (2) above, the power to the device 6 is turned off. Even if the motor is stopped, in the former case, when the power to the milk device 64 is turned off, the counterclockwise rotation biasing force of the spring 63 of the clutch lever 60 will automatically move the reverse shaft. 30 side nail east 34
The rotation stopper is released, and the wind turbine 44 on the forward shaft 40 side
The rotation of the mirror case 15 is stopped, and in the latter case it is already in that state, so in either case, when the mirror case 15 moves backward or the drive of the forward movement a stops, the self-weight of the mirror case 15 on the driven side is The naturally descending blade due to the force acts as a force to rotate the forward shaft 40 clockwise in FIG. The member 42 is in a tightened state (clutch-on), that is, the driven side and the drive source side are connected, and the mirror on the driven side The naturally descending blade is supported by the force of the case 15's own weight, and as a result, the mirror case 15 moves backward without naturally descending, or the intermediate position of the inclined guide member 16-17h at the time when the forward motion a is stopped. It is stably stopped and held.

C. Effects of the Invention As described above, according to the present invention, the various problems described above due to the natural downward movement force along the inclined guide members 16 and 17 due to the self-gravity force of the moving optical element 15 can be rationally solved. Ru.

The SL device 64 can be easily controlled because it is only necessary to energize the movable optical element 15 during backward movement in the upward direction along the inclined guide members 16-17. Furthermore, it is possible to construct a compact device as a whole.

[Brief explanation of drawings]

Fig. 1 is a front view of the forward/reverse clutch mechanism, Fig. 2 is an enlarged longitudinal sectional front view of its main parts, and Fig. 3 is an enlarged longitudinal sectional plan view of the same.
Figure 4 is a schematic diagram of an example of the exposure optical system of a microfilm printer, Figure 5 is a partially cutaway front view of the mirror case, Figure 6 is a plan view of the same, and Figure 7 is a diagram of another exposure optical system. Schematic. 15 is a mirror case as a moving optical element, 16 and 17
is the inclined guide member, lOO is the forward/reverse clutch mechanism, 30
is a shaft for backward movement, 40 is a shaft for forward movement, 31 to 38
41 to 48 are spring clutch mechanisms for the reverse shaft, 60 to 67 are clutch lever mechanisms. ” Figure 3 Figure 5 Figure 6 Figure 7

Claims (2)

[Claims] (1) In an optical system moving type exposure apparatus including an optical element that is driven to move in a descending direction and an ascending direction by a drive system along an inclined guide member, the optical element is driven to move in a descending direction along an inclined guide member. A spring clutch is interposed in the drive system to connect the optical element side, which is the driven side, to the drive source side by tightening the optical element by a natural downward movement force along the inclined guide member due to the force of its own weight. A moving optical system exposure apparatus characterized by the following. (2) The optical system movable exposure apparatus according to claim 1, wherein the spring clutch on/off control link brings the spring clutch into a tightened state when the control is off.