JP2712040B2 - Image exposure equipment - Google Patents

Description

The present invention relates to an image exposure apparatus applied to, for example, a copying machine, an OCR (optical character reader), a computer input device, and the like, and particularly relates to a light source, a mirror, and the like. The present invention relates to an image exposure apparatus that guides a light image of a document to a light receiving unit by moving a traveling optical system configured as described above.

(Prior Art) Conventionally, in this type of apparatus, a traveling optical system is used to prevent a traveling optical system, which is a main movable part inside the apparatus, from being damaged or displaced due to vibration and impact during transportation. A device that can fix a system is known. In this case, in a device of a type that drives both sides of the traveling optical system, if the one end of the traveling optical system is simply fixed, the other end is swung. Therefore, a device in which both ends are fixed is also proposed. Has been issued.

FIGS. 6A and 6B show the configuration of such a device. In the this device, a light source 101, a light source unit U ₁ consists mirror 102 and the base, the two mirrors 10
4,105 and a configured mirror unit U ₂ from the base 106 or the like, is set to be imaged exposed on the photoelectric conversion element 109 by the imaging lens 108 while deflecting the light image of the original 107 by the mirror 102, 104 and 105 .

Here, both ends of both units U ₁ and U ₂ are driving drums.
It is connected to a wire 111 wound around 110 and is configured to move at a speed ratio of 1: 1/2 along a shaft 112 as a travel guide by the principle of a moving pulley. Both units U ₁ and U ₂ are configured so that both ends are fixed during transportation by the configuration shown in FIGS. 7A and 7B.

As shown in the drawing, shafts 120 and 121 are fixed on a substrate 122, and a relay gear 123 and a driving drum 110 that mesh with each other are rotatably inserted. A motor 124 for driving the driving drum 110 is similarly fixed to the substrate 122,
A gear 125 meshing with the relay gear 123 is inserted into the gear 124a so as to be driven to rotate. Slot 110 on the underside of the drive drum 110
a is formed, and a fixing member 127 for fixing the units U ₁ and U ₂ at the time of transportation is provided on the outer cover 126 of the apparatus.
Is detachable. As shown in FIG. 8A, a pin 127a is fixed to the fixing member 127, and a claw 127b for holding the fixing member 127 at a predetermined position when fixing the units U ₁ and U ₂ is formed. ing.

As shown in FIG. 8 (b), a long hole 110a is formed on the bottom surface of the drive drum 110 so that its long axis coincides with the rotation direction in consideration of an error from a normal stop position. Further, a long hole 122a having a long axis in a direction orthogonal to the long hole 110a is formed in the substrate 122.

(Problem to be Solved by the Invention) In the above configuration, the fixing member 127 is moved upward in a state where the traveling optical system, that is, the light source and the mirror units U ₁ and U ₂ have completed the reading operation and have returned to the normal stop position. When pushed up, the claw 127b of the fixing member 127 engages with the protruding portion of the facing outer cover 126 to hold the fixing member 127. On the other hand, the fixing member 127
Of the drive drum 1
It is inserted into ten long holes 110a. When the drop impact during transportation conveyed in the arrow A direction of FIG. 6 is a scanning direction of the running optical system in this state (a) is applied, the light source unit U ₁ and the mirror unit U ₂ is by the inertia force of itself same Move in the direction. In this case, since the driving drum 110 is connected to the units U ₁ and U ₂ via the wires 111, FIG. 9 (b)
And stops when the pin 127a of the fixing member 127 hits the wall surface of the elongated hole 110a. As a result, the wires 11 locked on both sides of each unit U ₁ , U ₂
1 also stops, but since the units U ₁ and U ₂ receive the inertial force from the wire 111 equally to the left and right, the set positions at both ends do not shift.

However, in such a conventional example, each unit U ₁ ,
Because if the inertia force of U ₂ is large, the drive drum 110 to try to continue further rotated in the direction of arrow B, FIG. 9 (b)
The shaft 121 fitted to the drive drum 110 as shown in FIG.
The rotation starts around the seventh pin 127a, and falls in the direction of arrow R, which is the direction in which the drive drum 110 and the relay gear 123 are separated from each other. The falling of the shaft 121 causes the gear teeth formed on the driving drum 110 and the relay gear 123 to mesh with each other in a shallower manner, which causes the gear teeth to jump, and further the reaction force from the pin 127a to the driving drum 110 causes the shaft to move. When the teeth of the two gears collide with each other when the 121 is restored to the original position, there is a problem that the driving drum 110 and the relay gear 123 may lose their teeth or chip.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to obstruct a driving system for driving a traveling optical system during transportation of a device (gear of a gear, missing teeth, etc.). And the like, to provide an image exposure apparatus that can securely fix the traveling optical system so as not to cause the exposure.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a traveling optical system for forming and exposing a light image of a document to a light receiving unit by moving the document in a predetermined direction is provided. An image exposure apparatus for fixing a scanning optical system by fixing a predetermined one of rotatable drive transmission members for driving the traveling optical system with a predetermined play using a fixing member. When the rotation axis of the first drive transmission member among the drive transmission members is O ₁ , the contact point between the first drive transmission member and the fixed member at the time of impact is Q, and the first drive transmission member is The arrangement position of the fixing member is determined such that the angle of the line segment ▲ ▼ with respect to the line segment ▲ ▼ is within the range of 0 ° to 180 ° in the direction in which the first drive transmission member rotates due to the play at the time of impact. It is characterized by having.

(Operation) In the present invention having the above configuration, the line segment ▲ ▼
Is an angle in the direction in which the first drive transmission member rotates due to play between the first drive transmission member and the fixed member at the time of impact, and the magnitude of the angle is 0 to 180 degrees. Since the position of the contact point Q is determined so as to be within the range, the traveling optical system moves during transportation or the like, and the first drive transmission member rotates in the above direction due to its inertia force and contacts the fixed member. In this case, a force acts on the first drive transmission member to rotate in the same direction about the contact point Q. As a result, a force that presses the first drive transmission member against the second drive transmission member acts, so that the engagement between the first and second drive transmission members does not become shallow.

(Example) Hereinafter, the present invention will be described based on an illustrated example.

FIGS. 1 to 3 show the first embodiment of the image exposure apparatus according to the present invention.
FIG. 3 (a) and (b) show an embodiment of the present invention.

In the figure, V ₁ is a light source unit as a traveling optical system, the light source 1, and a mirror 2 and the base 3. V ₂ is a mirror unit as a traveling optical system, and is composed of two mirrors 4 and 5 and a base 6 fixed so that mirror surfaces are orthogonal to each other. Then, the optical image of the original 7 placed on the original platen D is turned back by the mirrors 2, 4, and 5, and the photoelectric conversion element 9 serving as a light receiving unit is formed by the imaging lens 8.
It is configured to perform imagewise exposure on the top.

The light source unit V ₁ and the mirror unit V ₂ is adapted to be driven by the first 2 is wound on the drive drum 10 is a drive transmission member of the family of wires 11 (11A, 11B). That is, one wire 11A is a pulley P ₃ having one end configured with mounted on both end portions of the light source unit V ₁ via a pulley P _1, P _2, the movable pulley provided at both ends of the mirror unit V ₂ , wound P ₄ wound, and the other end is fixed to the apparatus main body with a fixed light source conversion element 39 or the like. Further, another wire 11B is routed around pulleys P ₃ and P ₄ , one end of which is connected to each other via a spring (not shown), and the other end of which is connected to the drive drum via pulleys P ₁ and P _2. Returned to 10. Further, the light source unit V ₁ and the mirror unit V ₂
Is movably supported by a pair of parallel shafts 12,13. Thus, the light source unit V ₁ and the mirror unit
The V _2, 1 in accordance with the principles of the movable pulley: adapted to travel in the arrow M or N direction at half the speed ratio is.

FIGS. 3 (a) and 3 (b) show the two units.
This shows a state in which V ₁ and V ₂ are stopped at the normal stop position. Near the stop position of each unit V ₁ and V ₂ , a pair of stopper members 30 and 31
Is provided.

1A and 1B are an enlarged front view and a plan view showing the vicinity of the drive drum 10. FIG. As shown in FIG.
Shafts 20 and 21 are provided on the relay gear 22, and the relay gear 2 meshes with each other.
3 and the drive drum 10 are rotatably inserted. A motor 24 for driving the drive drum 10 is provided below the substrate 22, and a shaft 24 a of the motor 24 protrudes from the substrate 22. A gear 25 is fixed to the shaft 24a so as to mesh with a relay gear 23 as a second drive transmission member.

On the other hand, a fixing member 27 having the same configuration as the fixing member 127 shown in FIG. 8A is detachably attached to the exterior cover 26 of the apparatus. Here, a long hole 22a is formed in the base 22 for passing a fixing pin 27a provided in the fixing member 27, and a long hole 10a having a long axis in the rotation direction is formed on the lower surface of the drive drum 10. Are formed. When the fixing member 27 is pushed upward when the light source and the mirror units V ₁ and V ₂ are stopped at the regular stop position, the claws 27 _b of the fixing member 27 are locked by the locking portions (not shown) of the outer cover 26. )
And the pin 27a is inserted into the elongated hole 10a of the drive drum 10, and the units V ₁ and V ₂ are fixed. still,
The clearance between each of the units V ₁ and V ₂ and the stopper members 30 and 31 should be such that the pin 27 a of the fixing member 27 does not abut on the wall surface of the elongated hole 10 a of the driving drum 10 when they are brought into contact. Is set.

Further, the pin 27a of the fixing member 27 is connected to the axis O ₁ from a line connecting the axis O ₂ of the shaft 20 and the axis O ₁ of the shaft 21 in FIG.
Is inserted into the elongated hole 10a at a position rotated 90 degrees counterclockwise around the center.

FIGS. 2 (a) and 2 (b) show the movement of the drive system when a drop impact during transportation is applied in the direction of arrow M or N (FIG. 3 (a)). Drum 10 is second
As shown in FIG. 9A, the rotation is performed in the directions of arrows M 'and N', respectively.

Here, when a drop impact is applied in the direction of the arrow M, the pin 2 of the fixing member 27 is attached to the wall surface of the long hole 10a of the drive drum 10.
Before the unit 7a abuts, the units V ₁ and V ₂ abut against the corresponding stopper members 30 and 31, respectively, and the movement of the wire 11 and the rotation of the drive drum 10 stop. In this case, the distance between each of the units V ₁ and V ₂ and the stopper members 30 and 31 is set to be very short, and both units V ₁ and V ₂ are connected to the stopper members 30 and 31 before the traveling optical system has a large inertial force. Since they come into contact with each other, the impact force is extremely weak, and there is no problem such as displacement of the set positions of the units V ₁ and V ₂ .

On the other hand, when a drop impact during transportation is applied in the direction of the arrow N, both units V ₁ and V ₂ move in the same direction, and as shown in FIG. The drive drum 10 rotates until the pin 27a of the fixing member 27 abuts on the contact point Q, and this stops. Here, in this embodiment, the pin 27a inserted into the elongated hole 10a is connected to the shaft center O ₁ ,
Rotation of the drive drum 10 when O ₂ the arrow N 'direction about the axis O ₁ from the line connecting the (light source and the mirror unit V _1, V ₂ is applied impact direction no impinge on the stopper member 30, 31 Direction), the drive drum 10 is pressed against the relay gear 23 even if a force in the S direction about the contact point Q acts on the shaft 21. Therefore, even when a drop impact is applied in the direction of arrow N, the meshing of the gears of the drive drum 10 and the relay gear 23 does not become shallow, and it is possible to prevent tooth crushing or the like caused by gear skipping. .

It should be noted that the gear engagement between the drive drum 10 and the relay gear 23 can be prevented from becoming shallow even at positions other than the position of the pin 27a of the fixing member 27 described above. That is, in FIG. 2 (b), a portion (engagement point T) of the drive drum 10 meshing with the relay gear 23 is an arrow perpendicular to a straight line connecting the contact point Q of the wall surface and the mesh point T. The drive drum 10 rotates in the direction S '. Therefore, in order to prevent the gear meshing from becoming shallow, the arrow S 'only needs to be directed upward in the figure from the tangent G of the gear meshing, so that the position of the pin 27a of the fixing member 27 is It is not limited to a straight line having an angle of 90 degrees with respect to a straight line passing through the axis O ₁ , O ₂ , and is within a range from I to J in the drawing, that is, What is necessary is just to set to the position where the connecting straight line is included in the left side of the drive drum 10 in the figure.

FIGS. 4 and 5 show the main parts of a second embodiment of the present invention. The same parts as those of the above embodiment will be described with the same reference numerals.

In this embodiment, the driving drum is not fixed as in the above embodiment, but the relay gear 73 is fixed.
That is, as shown in FIG.
From the line connecting the the 'axis O ₂ of the shaft 21' the axis O ₁ of the shaft 20,
The relay gear 73 when an impact is applied in a direction in which the light source and the mirror units V ₁ and V ₂ do not hit the stopper members 30 and 31.
Is inserted into the elongated hole 73a of the relay gear 73 at a position rotated by 90 degrees about the axis O ₁ ′ in the rotation direction (the direction of the arrow N ″ in FIG. 5). The gear 25 is a relay gear 73 on an extension of the shaft 21 and the pin 27a side of the fixing member 27.
It is arranged to mesh with.

Also in this embodiment, if a drop impact is applied in the direction of arrow M in FIG.
There is no problem because the units V ₁ and V ₂ are received and stopped by 30, 31.

Further, when a drop impact is applied in the direction of arrow N in FIG. 1, the relay gear 73 is inserted into the slot 73a as shown in FIG.
The rotation is stopped until the pin 27a of the fixing member 27 abuts against the contact point Q 'on the wall of the unit V. When the inertia force of each unit V ₁ and V ₂ is large, the units V ₁ and V ₂ try to rotate in the same direction. Since the gear 73 rotates in the direction of the arrow K, the engagement between the relay gear 73 and the drive drum 60 does not become shallow. Incidentally, the gear 25, which is the other gear meshing with the relay gear 73, has a small meshing position with the pin 27a of the fixing member 27, so that the meshing between the gears does not become shallow.

In the above embodiment, an apparatus for guiding a light image of a document to a photoelectric conversion element has been described as an example. However, the present invention is not limited to this, and a copying machine for guiding a light image of a document to an electrophotographic photosensitive member. It is needless to say that the present invention can be applied to such a device.

Further, in the above embodiment, the drive drum and the like are fixed from below, but the present invention is not limited to this, and the drive drum may be fixed from above.

Further, the means for fixing the drive drum and the like is not limited to the above embodiment, but may be any other means (for example, a drive transmitting member having a projection and a fixing member having a concave portion) as long as it can fix it with a predetermined play. May be used. However, according to this embodiment, the drive drum and the like can be fixed without taking up space.

(Effects of the Invention) As described above, in the present invention, by appropriately arranging the fixed position of the drive transmission member by the fixed member, the drive transmission member can be connected to each other due to the inertia of the traveling optical system at the time of impact. The engagement can be prevented from becoming shallow. As a result, it is possible to prevent tooth jump between gears when the drive transmission member is constituted by gears, and to securely fix the traveling optical system without causing gear tooth breakage and tooth missing during transportation and transport of the apparatus. It has the effect of gaining.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) show a main part of an image exposure apparatus according to a first embodiment of the present invention. FIG. 1 (a) is an enlarged front view showing the vicinity of a driving drum, and FIG. ) Is a plan view of the portion shown in FIG. 3A, FIGS. 2A and 2B are explanatory diagrams showing movements of the drive drum and the relay gear at the time of a drop impact in the embodiment, and FIG. 4A and 4B show the entire configuration of the embodiment, FIG. 4A is a plan view, FIG. 4B is a longitudinal sectional view, and FIG. 4 is a main part of a second embodiment of the present invention. FIG. 5 is an explanatory view showing the movement of the drive drum and the relay gear at the time of a drop impact of the embodiment, and FIGS.
(B) shows the overall configuration of a conventional image exposure apparatus.
7 (a) is a plan view, FIG. 7 (b) is a longitudinal sectional view, and FIGS. 7 (a) and 7 (b) show essential parts of the conventional apparatus, and FIG. FIG. 8B is an enlarged front view showing the vicinity, FIG. 8B is a plan view of the portion shown in FIG.
Is an enlarged perspective view showing a fixing member of the conventional device, FIG. 8B is a plan view showing a lower surface of a driving drum of the conventional device, and FIGS. 9A and 9B are devices of the conventional device. FIG. 5 is an explanatory diagram showing movements of a drive drum and a relay gear at the time of a drop impact. EXPLANATION OF SYMBOLS 7 Original document 9 Photoelectric conversion element (light receiving unit) 10 Driving drum (first driving transmitting member) 10a Elongated hole 11 Wire 23 Relay gear (second driving unit) Transmission member) O ₁ , O ₂ … axis (rotation axis) Q… contact point V ₁ … light source unit (traveling optical member) V ₂ … mirror unit (traveling optical member)

Claims (1)

(57) [Claims] A moving optical system for forming a light image of the original on a light receiving portion by moving the original in a predetermined direction with respect to the original, and a rotatable drive transmission member for driving the traveling optical system; In the image exposure apparatus for fixing the scanning optical system by fixing a predetermined one with a predetermined play using a fixing member, the rotation axis of the first drive transmission member among the drive transmission members may be adjusted. When O ₁ , the contact point between the first drive transmission member and the fixed member at the time of impact is Q, and the rotation axis of the second drive transmission member meshing with the first drive transmission member is O ₂ , a line segment ▲ ▼
Angle from the line segment ▲ ▼ in the direction of rotation of the first drive transmission member due to the play at the time of impact from 0 degree
An image exposure apparatus, wherein an arrangement position of a fixing member is determined so as to be within a range of 180 degrees.