JPH05158329A - Moving device - Google Patents

Abstract

PURPOSE:To always keep a moving body at a fixed angle to a guiding member regardless of the dimensional accuracy of the component element of a pair of driving force transmitting means. CONSTITUTION:This moving device has a pair of guide rails 15a and 15b arranged in parallel, and 1st and 2nd mirror carriages 13 and 9 which are installed so as to freely move along a pair of guide members so that both end sides may be held by the rails 15a and 15b; and it is provided with a rotating coupling shaft 2, a pair of driving pulleys 1a and 1b attached to the coupling shaft 2, and a pair of driving force transmitting means F and G which individually transmit the rotational torque of the pair of driving pulleys 1a and 1b to both sides of the mirror carriages 13 and 9 as moving force. In this device, a holding means for keeping the mirror carriages 13 and 9 at the fixed angle to the pair of guide rails 15a and 15b, and a viscous coupling 60 which transmits the rotational torque in proportion to relative angular speed between one driving pulley and the coupling shaft 2 to the driving pulley 1b are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving device used in a document reading system such as a copying machine, an image reader and a facsimile.

[0002]

2. Description of the Related Art FIG. 11 shows a document reading system to which a moving device of a first conventional example is applied. Reference numerals 100 and 101 denote guide rails as a pair of guide members, which are arranged parallel to each other. Both ends of a first mirror carriage 102 and a second mirror carriage 103 as movable bodies are movably held on the guide rails 100 and 101. Specifically, it is held by a roller or the like not shown.

A pair of driving force transmitting means A and B are provided beside the guide rails 100 and 101. The driving force transmission means A and B are drive pulleys 104 and 105 as rotating bodies,
It has driven pulleys 106 and 107. Further, pulleys 108 and 109 are attached to both ends of the second mirror carriage 103.

Wires 110 and 111 are separately wound around the drive pulleys 104 and 105, the driven pulleys 106 and 107, and the pulleys 108 and 109.
Both ends of 0 and 111 are fixed portions 112 of the apparatus main body,
It is fixed to 113. Also, the wires 110, 1
A part of 11 is fixed to both ends of the first mirror carriage 102 by fixing tools 114.

The drive pulleys 104 and 105 are connected shafts 1.
The pulley 1 is fixed to the end of the connecting shaft 115.
16 is fixed. 117 is a motor,
A pulley 119 is fixed to the output shaft 118 of 17.
A belt 120 is wound around the pulleys 116 and 119.

On the other hand, a lens 121 and a reading sensor 122 are provided between the guide rails 100 and 101.

In the above structure, the driving force of the motor 117 is transmitted via the pulleys 119 and 116 to the driving pulleys 104 and 1.
When the drive pulleys 104 and 105 rotate, the first mirror carriage 102 and the second mirror carriage 103 reciprocate on the guide rails 100 and 101 in the arrow D direction.

During the above movement, the first mirror carriage 102
The light of the lamp mounted on illuminates the document on the platen glass, and the reflected light passes through the slit 123 and
The image of the original is read by reaching the reading sensor 122 via a mirror and mirrors 124 and 125 (not shown) and a lens 121.

FIG. 12A shows a second conventional example. The guide rod 513 and the guide rail 516 are provided in parallel, and the first mirror carriage 510 and the second mirror carriage 512 are respectively attached to the sliders 514 and 515.
It is slidably supported by. The first mirror carriage 510 has a light source lamp and a mirror (not shown), and the second mirror carriage 512 has two mirrors.

Reference numeral 501 denotes a drive pulley as a drive means, which is rotatably supported by the main body by a bearing (not shown). A timing pulley 502 and a motor pulley 503 are fixed to an output shaft of a motor 504 which is rotationally driven by a control device (not shown). The drive pulley 501 is rotationally driven by a motor 504 via a belt 505.

Reference numerals 506 and 520 denote wires as wire rods.
One end of the wire 506 is wound around a driven pulley 508 and then connected to a mounting portion 500 of the apparatus body (not shown) via a second mirror pulley 507 and a spring 509. The other end of the wire 506 is wound around the drive pulley 501 and then mounted on the mounting portion 51 of the first mirror carriage 510.
It is connected to 1. Further, one end of the wire 520 is connected to the mounting portion 511, and the other end is fixed to the mounting portion 518 of the apparatus main body via the second mirror pulley 507.

(B) shows the connection structure of the wire 520. A hook 522 having a hole 523 is fixed to the end of the wire 520, and the mounting portion (pin) 5 is inserted in the hole 523.
18 is inserted. The other mounting portions have the same structure.

A lens unit 517 including a lens and an image reading sensor is provided between the guide rod 513 and the guide rail 516.

In the above structure, the motor 504 is driven, and its rotational torque is transmitted to the drive pulley 501 via the belt 505 and the timing pulley 502. Then, the drive pulley 501, the driven pulley 508, and the mirror pulley 507 rotate to drive the wires 506 and 520, and the first mirror carriage 510 and the second mirror carriage 512 reciprocate along the rod guide 513 and the guide rail 516. , The light source lamp illuminates the original. The reflected light is reflected by a total of three mirrors of the first mirror carriage 510 and the second mirror carriage 512, and an image is read by the lens unit 517.

[0015]

However, in the above-mentioned first conventional example, the rotational driving force of the connecting shaft 115 causes the driving pulleys 104, 105, the wires 110, 111, and the driven pulley 1 to rotate.
Even if the torques transmitted from the connecting shaft 115 to the drive pulleys 104, 105 are equal, the driving force transmission means A, B are transmitted.
Therefore, due to dimensional accuracy and shape errors such as the diameter of the pulley and the wire, a difference in moving speed occurs on both ends of the first mirror carriage 102 and the second mirror carriage 103. As a result, there is a problem that the first and second mirror carriages 102 and 103 cannot hold the positions perpendicular to the guide rails 100 and 101, and the straightness and squareness of the read image deteriorate.

[0016] These problems occur, in particular, in the case of a reading apparatus of the type in which a moving body is moved a plurality of times to read the same original in a color copying machine or the like, the reading timing of the same pixel is slightly shifted at each scanning opportunity. As a result, the color information was erroneously detected, and it was easy to appear as a change in color tone or unevenness.

In the second conventional example, the one end mounting portion 500,
Since the wires 506 and 520 connected to 511 and 518 have no degree of freedom in the circumferential direction, the following problems occur.

The wires 506 and 520 are connected to the drive pulley 5
01, the driven pulley 508, and the mirror pulley 507, the wires 506 and 520 are twisted to increase the tension, and the winding workability is poor.

Further, in the shape of the conventional hanging wheel 522,
Since the insertion direction is limited to 180 degrees, such as whether it is inserted from one side of the hole 523 or the other side, the attachment portion 518 is inserted into the hole 523 of the hanging wheel 522. At this time, the wire 506 can be up to 90 degrees.
The work of twisting 520 is required, which is one of the causes for leaving the twisting stress.

If the wires 506 and 520 are pulled and driven while the wires 506 and 520 have a torsional stress, the frictional resistance between the wires 506 and 520 and the drive pulley 501, the driven pulley 508, and the mirror pulley 507 increases, and The smooth pulling motion of 506 and 520 is obstructed and a slight blur occurs, and the first mirror carriage 51
0, and the second mirror carriage 512 is shaken. As a result, the read image is likely to be disturbed.

Particularly, in a color copying machine or the like, the first mirror carriage and the second mirror carriage are reciprocally moved a plurality of times to read the same original, and therefore, even if the blur is extremely small, the color information can be obtained. Was erroneously detected and was likely to appear as a change in color or unevenness.

Further, the wires 506 and 5 are twisted by the torsional stress.
20 is likely to be damaged, resulting in poor movement of the first mirror carriage 510 and the second mirror carriage 512 and a decrease in durability.

The present invention is intended to solve the above problems, and a first object of the present invention is to always keep a fixed angle of a moving body with respect to a guide member regardless of dimensional accuracy of components of a pair of driving force transmitting means. It is to provide a moving device that can be held.

A second object of the present invention is to provide a moving device capable of rotating the wire rod in the circumferential direction with respect to the mounting portion.

[0025]

In order to achieve the above object, the first means of the present invention is to provide a pair of guide members arranged in parallel and a pair of guide members to hold both end sides of the guide members. A movable body provided movably along the member, a rotating drive shaft, a pair of rotating bodies attached to the drive shaft, and a rotational torque of the pair of rotating bodies to move force to both sides of the movable body. In a moving device provided with a pair of driving force transmitting means for separately transmitting as the above, holding means for keeping the moving body at a constant angle with respect to the pair of guide members is provided, and one rotating body and the drive shaft are relatively opposed to each other. Torque transmitting means for transmitting the rotational torque proportional to the angular velocity to the rotating body is provided.

The torque transmitting means may be a viscous coupling containing a viscous fluid.

Further, the second means of the present invention has a moving body movably held by the apparatus main body, and a wire rod around which the wire rod is wound around the drive means, and the wire rod is a first mounting portion of the apparatus main body. In the moving device respectively connected to the second mounting portion of the moving body, the wire is configured to be rotatable in the circumferential direction of the wire with respect to at least one of the first and second mounting portions. ..

[0028]

In the first means of the present invention based on the above construction, when the drive shaft is rotated, the rotational torque is transmitted to the pair of driving force transmitting means via the pair of rotating bodies, and the pair of driving force transmitting means is operated. The moving body is moved along the pair of guide members by the power separately transmitted to both sides of the moving body via the moving body.

When the speeds transmitted to both sides of the moving body differ due to the dimensional difference between the pair of driving force transmitting means, the angle of the moving body with respect to the guide member tends to change. However, a difference in rotational angular velocity between the drive shaft and the rotating body occurs, and
Since the angular velocity difference is generally small, the rotational torque transmitted by the torque transmitting means is small and the influence on the holding means is small. Therefore, the moving body is always maintained at a substantially constant angle with respect to the guide member by the holding means.

Further, when vibration occurs while moving the moving body at a high speed, a difference in rotational speed occurs between the torque transmitting means and the rotating body, but the relative speed difference in this case is larger than that in the above case. Therefore, it exhibits a large resistance and suppresses the vibration of the moving body.

In the second means, the wire rod is pulled and driven by the driving means to move the moving body. On the other hand, since the wire rod can rotate in the circumferential direction when it is wound around the driving means,
Less likely to twist. Further, even if the wire rod is twisted around the drive means, the restoring force and the tension due to the rigidity of the wire rod are combined to rotate the wire rod in the circumferential direction to correct the twist.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the first means of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a first embodiment in which the present invention is applied to a document reading system such as a copying machine or an image reader.
Reference numerals 15a and 15b are guide rails as a pair of guide members, and the guide rails 15a and 15b are parallel to each other. The guide rails 15a and 15b are U-shaped in cross section as shown in the figure, and have upper plates 50 and 51 and side plates 52 and 53. The guide rails 15a and 15b are provided below the original platen glass (not shown) in parallel with the original platen glass.

On the guide rails 15a and 15b, a first mirror carriage 13 and a second mirror carriage 9 are mounted as movable bodies which can reciprocate in the direction of arrow E. Recesses 54 and 55 corresponding to the guide rails 15a and 15b are provided on the lower surface side of the first mirror carriage 13, and the recesses 54 and 55 have guide rails 15a and 15b.
b, a spherical slider 14 contacting the upper plates 50, 51
a and 14b are provided.

The recess 54 is provided with a pair of holding sliders 16a which come into contact with one side plate 52, and an urging slider 17a which comes into contact with the other side plate 52 by the elastic force of the leaf spring 18. There is. The biasing slider 17a is located substantially at the center of the pair of holding sliders 16a.

The holding slider 16a, the biasing slider 17a, and the leaf spring 18 are holding means, which hold the first mirror carriage 13 in the guide rail 15a.
15b is always kept at a constant angle in the horizontal direction.
The sliders 14a and 14b position the first mirror carriage 13 in the height direction.

A slit 22 is provided on the upper surface of the first mirror carriage 13 at right angles to the moving direction, and an illumination lamp and a mirror (not shown) are mounted on the slit 22.

The second mirror carriage 9 is also provided with sliders 14a and 14b as height direction positioning means similar to the first mirror carriage 13, and a pair of holding sliders 16c and leaf springs 18b as holding means.
A biasing slider 17b is provided.

The second mirror carriage 9 is the mirror 5
It is equipped with 6,57.

The holding means for the first and second mirror carriages 13 and 9 is provided only on one guide rail 15a side.

Further, mirror pulleys 20a and 20b are rotatably attached to both end surfaces of the second mirror carriage 9.

The first and second mirror carriages 13 and 9
A pair of driving force transmitting means F and G is provided on both end sides of the guide rails 15a and 15b. The driving force transmission means F, G are driving pulleys 1a, 1b as opposed rotating bodies, driven pulleys 10a, 10b provided at predetermined intervals from the driving pulleys 1a, 1b, and the driving pulleys 1a, 1b, driven. It has components such as wires 8a and 8b wound around pulleys 10a and 10b and mirror pulleys 20a and 20b.

Then, one ends of the wires 8a and 8b are fixed to a device body (not shown) by a fixing tool 58 via a tension spring 11a, and the other ends of the wires 8a and 8b are fixed by a fixing tool 59. is there. Further, the wires 8a and 8b, which are the drive pulleys 1a and 1b and the mirror pulleys 20a and 2b,
The portions corresponding to 0b are fixed to both end surfaces of the first mirror carriage 13 by fixing tools 12a.

The drive pulleys 1a and 1b are attached to the connecting shaft 2, and the drive pulley 1a corresponding to the driving force transmitting means F on the side having the holding means is directly fixed to the connecting shaft 2 as a drive shaft. is there.

The other drive pulley 1b is connected to the connecting shaft 2 via a viscous coupling 60 as a torque transmitting means.
It is attached to. FIG. 4A shows a viscous coupling 60.
FIG.

Reference numeral 3a is a cylindrical inner ring, which is fixed to the connecting shaft 2 with screws 23. An outer ring 3b is fixed to the drive pulley 1b at its outer periphery and is rotatably supported by the inner ring 3a. 3 c is a blade integrally formed with the inner ring 3 a, and 2 to 6 blades are radially formed. 3d is a silicone oil as a viscous fluid, which is an inner ring 3a and an outer ring 3b.
The space 61 is filled with

The support portions of the inner ring 3a and the outer ring 3b have thrust regulating means and oil sealing means (not shown) to prevent the outer ring 3b from moving in the thrust direction and prevent oil leakage. With such a configuration, the connecting shaft 7 can transmit the rotational torque proportional to the mutual relative angular velocity to the drive pulley 1b.

The connecting shaft 2 is rotatably held with respect to the main body (not shown), and the connecting shaft pulley 4 is fixed to the end portion. Further, 6 is a motor, and the output shaft 6 of the motor 6
The motor pulley 5 is fixed to a. A belt 7 is wound around the connecting shaft pulley 4 and the motor pulley 5.

A lens 65 and a reading sensor 21 are provided between the guide rails 10a and 10b.

In the above structure, the driving force of the motor 6 is transmitted to the driving force transmission means F, G via the connecting shaft 2 and the driving pulleys 1a, 1b, and the first and second mirror units 13, 1 are transmitted.
It is transmitted as separate power to both sides of 9 and reciprocates in the direction of arrow E. The second mirror carriage 9 moves at half the speed of the first mirror carriage 13.

During this movement, the original is illuminated by the light of the illumination lamp of the first mirror carriage 13, and the reflected light passes through the slit 22 and is read by the reading sensor 21 via the mirrors 56, 57 and the lens 65.

By the way, when there is no dimensional error in the drive pulleys 1a, 1b, the driven pulleys 10a, 10b, the wires 8a, 8b, etc., that is, when the scanning speeds by the two are the same, the distance between the drive pulley 1b and the connecting shaft 2 is increased. Since there is no fast-to-angular velocity, the viscous coupling 60 does not generate a transmission torque by its nature.

At this time, the drive pulley 1a and the drive pulley 1b apparently rotate at the same rotation, but this is not due to the transmission torque of the viscous coupling 60, but rather the drive pulley 1
The first and second mirror carriages 13 and 9 are driven by the driving force transmission means F including a and wires 8a.

As a result, the drive pulley 1b runs around.

That is, the scanning drive is performed only by the drive system on the side including the drive pulley 1a, and the first mirror carriage 13 and the second mirror carriage 9 are held sliders 16a, 16b, 16c, 16d and bias sliders. 17a and 17b keep a constant angle with respect to the guide rail 15a, that is, a right angle to the arrow E direction.

Next, in this state, the first mirror carriage 1
Consider a case where vibration is generated in 3 and the tip end portion on the driving force transmitting means F side is displaced with respect to the normal position. At this time, since the wire 8b is fixed to the end portion of the first mirror carriage 13, the displacement of the tip portion due to the vibration is caused by the drive pulley 1
A slip between b and the connecting shaft 2 is caused.

Therefore, if this state is modeled, FIG.
It can be expressed as in (B). That is, 60 is a viscous coupling 6
0 is modeled and the damping coefficient C of the coupling is
By setting (kg / sec) sufficiently large, it is possible to suppress the maximum value of the fluctuation x due to slippage to a small value.

Next, when there is a shape error between the driving force transmitting means F including the driving pulley 1a and the like and the driving force transmitting means G including the driving pulley 1b and the like, and there is a difference in scanning speed between the two, the first mirror carriage. As for the first mirror carriage 13, one end of the first mirror carriage 13 has the first mirror holder 1
Since it is held by 5, the slip occurs between the drive pulley 1b and the connecting shaft 2.

At this time, a transmission torque proportional to the sliding speed is generated in the viscous coupling 60, and the transmission torque causes the first mirror carriage 13 to bend and the end portion to be displaced from the normal position. Since the difference in scanning speed caused by the shape error of the two drive systems is extremely small, the transmission torque generated by the viscous coupling 60 is small, and therefore the displacement of the end portion of the first mirror carriage 13 is also small.

For example, according to an experiment by the applicant, a first mirror carriage 13 having a displacement x of about 0.1 mm when a load of 9.8 Newton is applied in the direction of arrow H in FIG. The one-side driven original scanning device without the driving force transmission means G and the original scanning device in this embodiment are used, and the first mirror carriage 13 during scanning is used.
The displacement x of the end portion of the viscous coupling with respect to the normal position was measured. When the damping coefficient of the viscous coupling 60 was converted into a load in the scanning direction and set to C = 680 kg / sec or more, x could be halved.

Next, it is assumed that there is a difference in diameter between the drive pulleys 1a and 1b, which causes a difference in scanning speed between the two drive systems. Normally, the difference in the feed amount due to the diameter error of the drive pulley is about 0.1 mm per drive pulley circumference,
On the other hand, the time required for one revolution of the drive pulley is about 1 second.

In this case, the average speed difference dv between the two drive systems is dv = 10 ^-4 m / sec. Due to this speed difference, slippage occurs in the viscous coupling 60, but the transmission torque F of the viscous coupling 60 due to the speed difference at this time is
Converted to the load of the first mirror carriage 13 in the scanning direction, F = C · dv. When the viscous coupling of C = 680 kg / sec is used as described above, F = C · dv = 680 × 10 ⁻⁴ = 0.068 (Newton). That is, a load of 0.068 Newton is applied to the tip portion of the first mirror carriage 13, but as described above, in the case of the first mirror carriage which is displaced by 0.1 mm under the load of 9.8 Newton, the first mirror carriage due to the load. 1
The displacement dx of the three tips is: dx = 0.1 / 9.8 × 0.068 = 6.9 × 10
It will be ^-4 (mm). In the conventional two-sided drive document scanning apparatus, the drive pulley 1 with respect to the feed amount by the drive pulley 1a
Since the difference in the feed amount due to b is the displacement of the tip of the first mirror carriage 13, if this is dx ', then dx' = 0.1 (mm) in the above example, and it is sufficient to compare the above dx. I understand that it is small.

The effect of reducing the displacement of the first mirror carriage 13 has been described above.
Also has the same effect.

Another embodiment of the present invention will be described with reference to FIG. Incidentally, in the present embodiment, the description of the same reference numerals as those in the first embodiment will be omitted.

In FIG. 5, reference numeral 26 denotes a sensor unit (moving body) including a light source lamp, a rod lens array, and a linear image sensor (not shown). A sensor unit holder 24 provided at one end of the sensor unit guide rod (guide member). 16 is slidably supported, and the other end is supported by a slider 25 that abuts on a guide rail (guide member) 18.

Then, the sensor unit holder 24 as a holding means supports the sensor unit 26 so as to be always perpendicular to the guide rod 16. The wire 8a is wound around the drive pulley 1a, and one end thereof is wound around the driven pulley 10a and then connected to the other end via the spring 25a.

The sensor unit 26 is fixed to a part of the wire 8a by a fixing tool 12a fixed on the wire 8a. The wire 8b is also wound in the same manner and constitutes a drive system at the other end of the sensor unit 26.

With this configuration, the sensor unit 21 is caused to scan along the guide rod 16 by rotationally driving the motor 6, and the sensor unit 26 is provided with the reflected light of the original image (not shown) above the sensor unit 26. Photoelectric conversion is performed with a linear image sensor.

With the above structure, the sensor unit 2 is provided in the same manner as the description of the first mirror carriage 13 in the first embodiment.
It is possible to reduce the vibration of No. 6 and prevent the tip of the sensor unit from being displaced by the difference in scanning speed due to the shape error of the two drive systems.

6 to 10 show the second means.

(Third Embodiment) FIG. 6 is a perspective view showing the entire document scanning device using the present invention. Guide rod 21
3 and the guide rail 216 are provided in parallel, and the guide rod 213 and the guide rail 216 are the first moving body.
Mirror carriage 210, second mirror carriage 212
Are slidably supported by sliders 214 and 215, respectively.

The first mirror carriage 210 includes a light source lamp and a mirror (not shown), and the second mirror carriage 2
12 includes two mirrors 260 and 261. A lens unit 217 including an image reading sensor is provided between the guide rod 213 and the guide rail 216.

Beside the guide rod 213, a drive pulley 201 as a drive means is provided. Drive pulley 20
1 is fixed to one end of a drive shaft 200 rotatably supported by a bearing (not shown), and a timing pulley 202 is fixed to the other end of the drive shaft 200.

Reference numeral 203 denotes a motor pulley, which is an output shaft 25 of a motor 204 which is rotationally driven by a controller (not shown).
It is fixed at 0. A belt 205 is wound around the timing pulley 202 and the motor pulley 203.

Reference numerals 206 and 251 are wires as wire rods.
One end of the wire 206 has a driven pulley 20 as a driving means.
After being wound around 8, it is connected to a first mounting portion 252 of the apparatus main body (not shown) via a second mirror pulley 207 as a driving means and a spring 209. Also, wire 2
The other end of 06 is wound around the drive pulley 201 and then connected to the second mounting portion 211 of the first mirror carriage 210.

Further, one end of the wire 251 is attached to the second mounting portion 2
11 (a), and the other end is connected to the first mounting portion 218 of the apparatus main body via the second mirror pulley 207.
Is an enlarged view of the end portion of the wire 251, and FIG. 7B is a sectional view thereof. Reference numeral 219 is an end fitting fixed to the end of the wire 251 by crimping, and 220 is a free hook. The terminal fitting 219 has a cylindrical portion 219 holding the wire 251 and a spherical locking portion 219a.

The free hook 220 is provided with a locked portion 271 and a hanging wheel 272. A hole 220 is formed in the locked portion 271.
a is provided. This hole 220a is provided with the engaging portion 219a.
The diameter is slightly smaller than the outer diameter of the cylindrical portion 219. In addition, the hanging wheel 272 has a hole 220b along the radial direction of the wire 251. A cylindrical portion 219 is inserted and supported in the hole 220a. Therefore, the wire 251 is rotatable about the axis of the free hook 220 in the circumferential direction, that is, the pulling direction.

A bracket 273 is fixed to the main body of the apparatus, and the bracket 273 is provided with a pin 218 as a mounting portion projecting in a direction orthogonal to the wire 251. This pin 218 is the hole 220b of the universal hook 220.
Have been inserted into.

The other mounting portions 252 and 211 are also constructed in the same manner as above.

In the above structure, the motor 204 is driven, and its rotational torque is transmitted to the drive pulley 201 via the belt 205 and the timing pulley 202. Then, the drive pulley 201, the driven pulley 208, and the mirror pulley 207 are rotated to pull and drive the wires 206 and 251, and the first mirror carriage 210 and the second mirror carriage 212 reciprocate along the rod guide 213 and the guide rail 216. , The light source lamp illuminates the original.

This reflected light is reflected by the first mirror carriage 21.
The image is read by the lens unit 217 after being reflected by three mirrors of 0 and the second mirror carriage 212.

By the way, according to the present invention, the wire 20
Since 6, 251 can be rotated in the circumferential direction when being wound around the drive pulley 201, the driven pulley 208, and the mirror pulley 207, increase in tension due to twisting can be prevented.
Therefore, the hooking operation can be easily and quickly performed with a small force.

Further, even if the wires 206, 251 are wound around in a twisted state, the wires 206, 251
The restoring force due to the rigidity of 251 itself and the tension work together to rotate the wires 206 and 251 in the twist releasing direction to correct the twist, and the tension returns to an appropriate value.

Therefore, the wires 206 and 251 are not damaged by the torsional stress, and the wires 206 and 2 are not damaged.
The frictional resistance between 51 and the drive pulley 201, the driven pulley 208, and the mirror pulley 207 also decreases, and the wire 206,
The durability of 251 is improved, and stable traction operation can be performed for a long period of time. Therefore, the first mirror carriage 21
0, the second mirror carriage 212 can be moved back and forth with high accuracy, and the quality of the read image is improved.

In particular, when the present invention is applied to a color copying machine or the like in which the same original is read by moving the first mirror carriage and the second mirror carriage back and forth a plurality of times, the color information is erroneously detected and the tint changes. A good copy image without unevenness can be obtained. (Fourth Embodiment) In FIG. 8A, a sensor unit 221 includes a light source lamp (not shown), a rod lens array, and a linear image sensor, which is slidably supported by a guide rod 213 and is also a slider. 214
The guide rail 216 is brought into contact with and positioned in the height direction.

After the wire 206 is wound around the drive pulley 201, one end is connected to a bracket 280 as a mounting portion on one end side of the sensor unit 221, and the other end is also connected to the bracket 280 via a spring 209. To be done.

FIG. 8B is a detailed view of the bracket 280. Reference numeral 219 denotes an end fitting fixed to one end of the wire 206 by crimping, and the end fitting 219 is a spherical locking portion 2
It has 19a and the cylindrical part 219b. A bracket 280 fixed to the sensor unit 221 with a screw 223 is provided with a protrusion 281.
A hole 211a having a smaller diameter than 19a and a larger diameter than the cylindrical portion 219b is provided. A cylindrical portion 219b is inserted into the hole 211a so as to be rotatable in the circumferential direction.

A wire hook 222 is fixed to the other end of the wire 206, and is hooked through a spring 209 into a hole provided in the protruding portion 282 of the bracket 280. Further, the wire 206 does not rotate in the circumferential direction at this portion. The rest of the configuration is similar to that of the third embodiment.

With this structure, by rotating the motor 204, the sensor unit 221 is caused to scan along the guide rod 213 to illuminate an original document (not shown) above the sensor unit 221 and the reflected light from the sensor unit 221. Photoelectric conversion is performed by the linear image sensor provided in the. Also in this embodiment, the same effect as in the fifth embodiment can be obtained. (Fifth Embodiment) FIG. 9 shows a fifth embodiment of the present invention. The cylindrical portion 270 includes thrust washers 224a, 224 made of a low friction material such as copper metal or polyacetal resin.
b is provided. Thrust washer 224a, 22
4b is supported between the locking portion 219a and the locked portion 271. The thrust washer 224a is fixed to the cylindrical portion 270, and the thrust washer 224b is the locked portion 271.
It is fixed to.

The other parts are the same as those in the third embodiment.

According to this structure, the same effect as that of the third embodiment is obtained, and when the wire 251 rotates in the circumferential direction, the thrust washers 224a and 224b are rotated.
Since and slide, the frictional resistance is small and the rotation of the wire 251 can be further promoted. (Sixth Embodiment) FIG. 10 shows a sixth embodiment of the present invention. A thrust bearing 225 is arranged on the outer periphery of the cylindrical portion 270. One bearing ring 2 of the thrust bearing 225
25a is fixed to the locked portion 271, and the other race 225b is fixed to the locked portion 219a. The rest of the configuration is similar to that of the third embodiment.

According to this structure, the same effect as the third embodiment can be obtained, and the thrust bearing 225 reduces the load in the thrust direction generated between the end fitting 219 and the free hook 220 when the wire 251 is pulled and rolled. Therefore, there is an effect that the rotation of the wire 251 in the circumferential direction can be performed more smoothly.

[0092]

Since the first means of the present invention is configured as described above, the difference in the moving speed or the vibration at both ends of the moving body when the driving force transmitting means has a dimensional difference is caused by the torque transmitting means. It is absorbed, and the movable body can be constantly maintained at a constant angle with respect to the guide member, and stable mobility can be secured.

According to the second means, since the wire can be rotated in the circumferential direction when it is wound around the drive means, it is possible to prevent the tension from increasing due to the twist. Therefore, the hooking operation can be easily and quickly performed with a small force.

Even if the wire is twisted around in a twisted state, the restoring force due to the rigidity of the wire itself and the tension are combined to rotate in the circumferential direction to correct the twist, and the tension is also increased. Return to a proper value.

Therefore, the wire is not damaged by the torsional stress, the frictional resistance between the wire and the driving means is reduced, the durability of the wire is improved, and the stable pulling operation can be performed for a long time. Therefore, the moving body can be reciprocated with high accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment in which the present invention is used in a document reading system of a copying machine.

FIG. 2 is a side view of the first mirror carriage of FIG.

3 is a plan view of the first and second mirror carriages of FIG. 1. FIG.

4A is a cross-sectional view of the viscous coupling of FIG. 1,
FIG. 7B is a conceptual diagram showing vibration of the first mirror carriage.

FIG. 5 is a perspective view of a second embodiment of the present invention.

6 (a) and 6 (b) are a perspective view and a sectional view of a main part of a third embodiment in which the present invention is applied to a document scanning device.

FIG. 7 is a perspective view showing the overall configuration of a third embodiment.

FIG. 8A is a schematic perspective view of a document scanning device according to a fourth embodiment of the present invention, and FIG. 8B is a cross-sectional view of main parts of the device.

9 (a) and 9 (b) are a perspective view and a sectional view of a main part showing a fifth embodiment of the present invention.

FIG. 10 is a cross-sectional view of essential parts showing a sixth embodiment of the present invention.

FIG. 11 is a perspective view of a moving device to which the first conventional example is applied.

12A is a schematic perspective view of a document reading device to which a moving device of a second conventional example is applied, and FIG. 12B is a perspective view showing a main part of FIG.

[Explanation of symbols]

 2 connecting shaft (driving shaft) 1a, 1b driving pulley (rotating body) F, G driving force transmitting means 9 second mirror carriage (moving body) 13 second mirror carriage (moving body) 60 viscous coupling (torque transmitting means) 201 drive pulley (driving means) 206, 251 wire (wire material) 218 pin (mounting part) 280 bracket (mounting part) 210 first mirror carriage (moving body) 212 second mirror carriage (moving body) 221 sensor unit (moving body) )

Claims (3)

[Claims] 1. A pair of guide members arranged in parallel, and a movable body movably provided along the pair of guide members by holding both end sides by the pair of guide members to rotate. In a moving device provided with a drive shaft, a pair of rotating bodies attached to the drive shaft, and a pair of driving force transmitting means for separately transmitting the rotational torque of the pair of rotating bodies to both sides of the moving body as a moving force. Holding means for keeping the moving body at a constant angle with respect to the pair of guide members, and torque transmitting means for transmitting a rotating torque proportional to the relative angular velocity between the one rotating body and the drive shaft to the rotating body. A moving device comprising: 2. The moving device according to claim 1, wherein the torque transmission means is a viscous coupling containing a viscous fluid. 3. A moving body movably held by the apparatus main body, and a wire rod wound around a driving means, wherein the wire rod is respectively attached to a first mounting portion of the apparatus main body and a second mounting portion of the moving body. In the connected moving device, the wire device is configured to be rotatable in the circumferential direction of the wire member with respect to at least one of the first and second attachment portions.