JP2002317867A - Driving device, scanner and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device for producing a reduction in the number of machining processes for driving pulleys and in the weight thereof. SOLUTION: The driving device for moving a traveler with a wire driven by the driving pulleys 5, 6 mounted on a driving shaft 3 has the driving pulleys 5, 6 formed by pressing or rolling. Therefore, the number of machining processes for the driving pulleys 5, 6 is reduced and the weight of the driving pulleys 5, 6 in hollow structures are reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device for moving a movable body by a driving wire driven by a driving pulley attached to a driving shaft, a scanner having the driving device, and an image forming apparatus having the scanner. Related to the device.

[0002]

2. Description of the Related Art Conventionally, a driving wire is wound around a driving pulley attached to a driving shaft, a movable body to be moved is connected to a part of the driving wire, and the driving shaft is rotated together with the driving pulley. 2. Description of the Related Art A driving device in which a movable body is moved by a wire is known.

[0003] Such a driving device is used, for example, when a reading optical system for reading a document image is moved in a scanner or the like. The scanner may be used as a peripheral unit connected to a personal computer, or may be incorporated as a unit in an image forming apparatus such as a facsimile or a copying machine.

[0004]

The driving pulley used in such a driving device is conventionally made by aluminum die casting or the like, and when higher accuracy is required, cutting is performed as secondary processing. ing. However, this processing method requires a lot of man-hours and costs,
Further, there is a problem that the weight increases.

In the case where a plurality of drive pulleys for driving wires are attached to both ends of one drive shaft, and a movable body is moved by two wires driven by these drive pulleys, the left and right are used. If there is a difference in the wire winding length of the driving pulley, the moving speed and the moving distance at both ends will be different in the process of moving the movable body by the predetermined moving distance, and the posture of the movable body will be changed in the traveling direction of the wire. Cannot always be maintained in parallel to a straight line perpendicular to. As a result, for example, when the movable body supports the reading optical system for reading the document image, the reading optical system cannot be maintained parallel to the reading line in the main scanning direction, and the document image is not read. There is a problem that affects the reading system.

An object of the present invention is to reduce the number of processing steps and the weight of a driving pulley.

It is a further object of the present invention to facilitate positioning and assembling of the drive wire with respect to the drive pulley.

It is another object of the present invention to simplify the assembling of the drive wires to the drive pulleys without increasing the number of parts and the cost, and to improve the accuracy of extending the drive wires.

Another object of the present invention is to simplify the structure of assembling a drive pulley to a drive shaft without using new parts.

Another object of the present invention is to make it possible to easily correct the length of the drive wire pulled out from the drive pulley and the error in the mounting position of the drive shaft.

Another object of the present invention is to suppress variations in the winding position of the driving wire around the driving pulley.

It is still another object of the present invention to prevent a drive wire from moving between drive pulleys when drive pulleys are attached to both ends of a drive shaft.

[0013]

According to a first aspect of the present invention, there is provided a driving device for moving a movable body by a driving wire driven by a driving pulley attached to a driving shaft, wherein the driving pulley is formed by press working. Or, it is formed by forging.

Therefore, the number of processing steps of the drive pulley can be reduced, and the weight can be reduced by making the drive pulley a hollow structure.

According to a second aspect of the present invention, in the driving device according to the first aspect, the driving pulley has a hole through which the driving wire passes.

Therefore, by passing the driving wire through the hole provided in the driving pulley, the winding position of the driving wire with respect to the driving pulley is determined.

According to a third aspect of the present invention, in the driving device according to the first aspect, the driving pulley has a locking means for locking the driving wire.

Therefore, by fixing the drive wire to the drive pulley via the locking means, the assembly of the drive wire to the drive pulley can be simplified without increasing the number of parts and the cost, and the accuracy of the extension of the drive wire can be reduced. Improvement can be achieved.

The invention described in claim 4 is the first to third aspects of the present invention.
In the driving device according to any one of the above, at least one of the driving pulleys is formed so as to be pressed into the driving shaft.

Therefore, by press-fitting the drive pulley into the drive shaft, it is possible to simplify the structure of assembling the drive pulley to the drive shaft without using new parts.

[0021] The invention according to claim 5 is the invention according to claims 1 to 4.
In the drive device according to any one of the above, a stop position of the drive pulley in a rotation direction with respect to the drive shaft is adjustable.

Therefore, by adjusting the stop position of the drive pulley relative to the drive shaft in the rotational direction, it is possible to easily correct errors in the length of the drive wire pulled out from the drive pulley and the mounting position of the drive shaft. Becomes

According to a sixth aspect of the present invention, in the driving device according to the fourth or fifth aspect, the driving pulley is attached to both ends of the driving shaft, and these driving pulleys are provided at stop positions in the rotation direction with respect to the driving shaft. Adjustment is possible from the same direction.

Therefore, when the drive pulley fitted to the drive shaft is fixed by a fastening member such as a screw, the stop position for loosening or tightening the screw can be adjusted from the same direction. Position adjustment man-hours can be reduced and adjustment can be easily performed.

The invention according to claim 7 is the invention according to claims 1 to 6
In the driving device according to any one of the above, the driving pulley has a flange on at least one side of a wire winding portion around which the driving wire is wound. Therefore, the driving during the assembly of the driving wire to the driving pulley and the rotation operation of the driving pulley. The detachment of the wire can be prevented by the flange, and the performance and the assemblability during the rotation operation can be improved.

According to an eighth aspect of the present invention, in the driving device according to the seventh aspect, the flange of the driving pulley has a cut.

Therefore, by using the cuts in the flanges as marks for winding the drive wire, it is possible to improve the assemblability without increasing the cost of adding components or the like. When a part of the drive wire is fixed to the inside of the drive pulley, and the drive wire is wound around the outer peripheral surface of the drive pulley, the drive wire is passed through the notch of the flange so that the drive wire is outside the flange. This eliminates the need to move over the inside of the drive pulley, allows the drive wire to be wrapped around the drive pulley in an orderly manner, and further saves space on the outer peripheral portion of the drive pulley.

According to a ninth aspect of the present invention, in the driving device according to the seventh aspect, the driving pulley has a groove for holding the driving wire in the wire winding portion.

Therefore, the driveability is improved by winding the drive wire along the groove of the wire winding portion. In addition, it is possible to reduce variations in assembling, such as uneven winding of the drive wire and a shift in the winding position, so that the drive wire can be wound more orderly. Therefore, the driving accuracy can be further improved.

According to a tenth aspect of the present invention, in the driving device according to the second aspect, the driving pulley is attached to both ends of the driving shaft, and the hole through which the driving wire passes is formed between the driving pulleys in the rotation direction. It is formed at a position where the positions are equal.

Therefore, even if the outer diameter of a part of the outer periphery of the drive pulley changes due to the formation of the hole, the state of the change becomes equal between the drive pulleys when the drive shaft rotates.

According to an eleventh aspect of the present invention, in the driving device according to the eighth aspect, the driving pulley is attached to both ends of the driving shaft, and the cut is provided at a position where the driving pulleys have the same rotational position. Is formed.

Therefore, even if the outer diameter of a part of the outer periphery of the drive pulley changes due to the formation of the cut, the state of the change becomes equal between the drive pulleys when the drive shaft rotates.

According to a twelfth aspect of the present invention, a scanner includes:
The movable body for supporting a reading optical system for optically reading an image of a document placed on the document table, and the movable body is reciprocally driven along the document table. And a driving device.

Therefore, it is possible to provide a scanner having high image reading accuracy by obtaining the same effects as in the invention according to any one of the first to eleventh aspects.

An image forming apparatus according to a thirteenth aspect includes the scanner according to the twelfth aspect, and an image output unit that outputs an image read by the scanner.

Therefore, it is possible to provide an image forming apparatus capable of outputting image data with high image reading accuracy.

[0038]

FIG. 1 shows a first embodiment of the present invention.
This will be described with reference to FIG. 1 is a perspective view showing a driving device, FIG. 2 is a perspective view showing a schematic structure of a driving pulley fitted to a driving shaft, FIG. 3 is a vertical sectional front view showing details of the driving pulley, and FIG. FIG. 5 is a vertical sectional front view showing a state in which a driving wire is fixed inside a driving pulley, and FIG. 6 is a side view thereof.

First, the configuration of the driving device 1 will be described with reference to FIG. In the present embodiment, the carriages A and B that support the optical system in the scanner are movable bodies, and the movable bodies are moved. However, the movable body to be moved is not limited to this.

As shown in FIG. 1, the stepping motor 2
Is rotatably provided. A power transmission mechanism 4 for converting the rotational movement of the drive shaft 3 into a linear movement and transmitting the linear movement to the carriages A and B is provided.

The power transmission mechanism 4 is rotatably supported at fixed positions on both ends of the carriages A and B in the scanning direction, and driving pulleys 5 and 6 fixedly fitted near both ends of the driving shaft 3. Transmission pulleys 7 and 8, a transmission pulley 9 rotatably supported at both ends of the carriage B, a driving wire 10 wound around the driving pulleys 5 and 6 and the transmission pulleys 7 to 9.
And The transmission pulleys 7 and 8 are supported by opposed side plates (not shown) and the like. Both ends 10a and 10b of the drive wire 10 are fixed by support members (not shown). The driving wire 10 is fixed to both sides of the carriage A by fixing members 11.

When the driving shaft 3 is driven by the stepping motor 2 in such a driving device 1, the driving wires 10 are driven, so that the carriages A and B are scanned in the direction of reading the image of the original.

The driving device 1 according to the present embodiment is characterized by driving pulleys 5 and 6. Hereinafter, description will be made with reference to FIGS. As shown in FIG.
Are fitted to the drive shaft 3 and fixed by screws 12. As shown in FIG. 3, the driving pulleys 5 and 6 include a drum 15 having a flange 13 bent outward from the periphery of the opening surface and a fitting portion 14 fitted to the driving shaft 3. Flange 16 fixed to the surface opposite to the opening
And

As shown in FIG. 4, a mounting piece 17 having a semicircular cross section which surrounds substantially a half circumference of the drive shaft 3 is formed on the flange 16 of the driving pulleys 5 and 6 by bending.
A long hole 18 through which the air flows is formed in the circumferential direction.

The outer peripheral surface of the drum 15 is a wire winding portion 19 around which the driving wire 10 is wound. And FIG.
As shown in FIG. 6, holes 20 for passing the drive wire 10 are formed in a part of the outer periphery of the drive pulleys 5 and 6 so as to extend from the side surface of the drum 15 to the wire winding portion 19.
The flanges 13 and 16 of the driving pulleys 5 and 6 have cuts 2
1a and 21b are formed. The cut 21b of the flange 16 is formed at a position where the hole 20 is opened. On the inner side surface of the drum 15, two locking claws 22 as locking means for locking the driving wire 10 introduced from the hole 20 are formed by press working.

That is, as shown in FIG. 6, a metal ball 23 is fixed to a part of the drive wire 10, and this ball 23
Of the drive pulleys 5 and 6
The drive wire 10 is fixed inside. FIG.
, An opening 22a is formed in the side surface of the drum 15 to cut and raise the locking claw 22. The drive wire 10 is wound a plurality of times from the center of the wire winding portion 19 toward the flange 16 side.
The wire is wound inward from the flange 13 side of the wire winding portion 19 toward the center portion, and is wound around the wire winding portion 19 from the flange 13 side. . FIG. 6 shows the inner surface of the right drive pulley 6 as viewed from the center in the longitudinal direction of the drive shaft 3, but the left drive pulley 5 is symmetrical with FIG. 3 and 5, reference numeral 25 denotes a washer.

In FIGS. 3 and 5, the position of the cut 21a and the positions of the cut 21b and the hole 20 are illustrated as being formed in the same cross section for convenience of explanation. 6 differ in the circumferential direction (rotation direction). The cut 21b and the hole 20 are connected to the drive pulleys 5,6.
Are the same in the circumferential direction (rotational direction), but as shown in FIG.
Are different in the circumferential direction. For this position,
This will be described in detail in a second embodiment.

The drum 15 of the driving pulleys 5, 6
Is formed by drawing a steel plate, and the flange 16 is formed by punching and bending a steel plate. that time,
The outer diameter of the drum 15 and the fitting portion 14 are formed in the same process to ensure the positional accuracy between the fitting portion 14 and the drive shaft 3, so that the inner diameter of the drive pulleys 5 and 6 through which the drive shaft 3 passes is formed. And the wire winding portion 19 around which the drive wire 10 is wound, the coaxial accuracy is ensured, whereby a highly accurate drive system can be realized. The drive pulleys 5 and 6 may be formed by a wrench construction method. The locking means for fixing the drive wire 10 is not limited to the locking claw 22 alone.

In such a configuration, the driving pulleys 5,
6 has flanges 13 and 16 on both sides, so that rotation of the drive pulleys 5 and 6 prevents the drive wire 10 from shifting and dropping off the wire winding portion 19. Also, when the drive wire 10 is wound around the drive pulleys 5, 6, the fall of the drive wire 10 from the wire winding portion 19 can be prevented by the flanges 13 and 16, and the workability of the winding operation can be improved. In this case, the driving pulleys 5 and 6 have a flange 13 on one side and a flange 16 on the other side.
Although it is desirable to have, the effect can be expected on the other hand.

In this example, the movable bodies to be driven are the carriages A and B. In general, when the carriages A and B are moved, the drive wires 10 wound around the paired drive pulleys 5 and 6 are used. To move the carriages A and B. In this case, the carriages A and B must be positioned and clamped in a direction perpendicular to the drive wire 10. Therefore, when the drive wire 10 is wound around the pair of drive pulleys 5 and 6 and clamped on the carriages A and B, uneven winding of the drive wire 10 between the drive pulleys 5 and 6 may occur.

This winding unevenness appears as a difference in the length of the drive wire 10 pulled out from the drive pulleys 5 and 6. As a result, the positions of both ends of the carriages A and B in the movement direction (sub-scanning direction) of the carriages A and B are different, and the carriages A and B cannot be positioned parallel to the reading line (main scanning direction). .

Therefore, according to the present embodiment, the drive shaft 3
When the drive pulleys 5 and 6 are fixed to the
The above winding unevenness can be corrected by adjusting the position of the drive pulleys 5, 6 in the rotation direction with respect to the drive shaft 3 within the range of play between the drive shaft 2 and the slot 18 (see FIG. 4).

Even if at least one of the drive pulleys 5 and 6 is press-fitted into the drive shaft 3,
By adjusting the press-fit position of the drive pulleys 5 and 6 with respect to the drive shaft 3, that is, the position in the rotation direction, it is possible to correct winding unevenness between the drive pulleys 5 and 6. By adopting the press-fitting method, the assembling work can be simplified and the number of parts can be reduced.

Further, since the driving pulleys 5 and 6 are formed with locking claws 22 for fixing the driving wire 10, by adjusting the position where the driving wire 10 is locked by the locking claws 22, the driving is performed. The positions of the drive pulleys 5 and 6 with respect to the shaft 3 in the rotation direction can be aligned.

Further, since the driving pulleys 5 and 6 have the holes 20 through which the driving wires 10 pass, the driving wires 10 are positioned by passing through the holes 20 provided in the driving pulleys 5 and 6, and the driving wires 10 are positioned. , 6 can facilitate and simplify positioning and assembling.

Further, the drive pulleys 5 and 6 are
Since the cuts 21a and 21b are provided at the cuts 3 and 16, the cuts 21a and 21b can be used as marks when the drive wire 10 is wound. As a result, the assemblability can be improved without increasing the cost of adding components or the like.

Further, as shown in FIG.
When a part of the drive wire 10 is fixed to the inside of the drive pulley 6 by the locking claw 22, and the drive wire 10 is wound around the wire winding portion 19 of the drive pulleys 5, 6, the drive wire 1
0 is passed through the notch 21a of the flange 13 so that the drive wire 10 does not need to be passed over from the outside to the inside of the flange 13 and the drive pulleys 5 and 6
Can be wound neatly, and the driving pulley 5,
Space saving can be achieved in the outer peripheral part of the sixth embodiment.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted. 7 is a side view showing the internal structure of one drive pulley 5, and FIG. 8 is a side view showing the internal structure of the other drive pulley 6 symmetrical to one drive pulley 5 shown in FIG. 3 is viewed from the center in the longitudinal direction. FIG. 9 is a cross-sectional view showing a pair of driving pulleys 5 and 6 provided at both ends of the driving shaft 3 and a drum 15 provided along a line XX in FIGS. 7 and 8, and FIG. Pulley 5,
6 is provided with a drum 15 as shown in FIGS.
FIG. 11 is a cross-sectional view showing a cross section taken along a line, and FIG. 11 is a cross-sectional view showing a cross section taken along line TT in FIGS.

7 to 11, for convenience of explanation, the drum of the left drive pulley 5 is denoted by reference numeral 15L, and the drum of the right drive pulley 6 is denoted by reference numeral 15R. The drums 15L and 15R are formed by pressing or forging, while the holes 20 through which the drive wires 10 pass and the cuts 21a are formed by punching. As a result, assuming that the outside diameter of a portion not affected by the formation of the hole 20 and the cut 21a is c (see FIG. 9), the hole 20
In the part where the material was punched, the material was
Since it is pulled toward the center of 0, the outer diameter d (see FIG. 10) of that portion is smaller than c, and the outer diameter e (see FIG. 11) of the portion where the cut 21a is formed is larger than c due to the spread of the cut 21a. Therefore, distortion occurs in the drums 15L and 15R.

Therefore, as shown in FIGS. 7 and 8, the cut 21a is rotated clockwise with respect to the horizontal XX line so that the positions of the drive pulleys 5 and 6 in the rotational direction are equal. It is formed at a position at an angle α in the direction (on the line TT). The hole 20 is positioned at an angle β in the clockwise rotation direction with respect to the horizontal XX line (on the UU line) so that the positions of the drive pulleys 5 and 6 in the rotation direction are equal to each other.
Is formed.

In such a configuration, the driving pulleys 5,
Even if the outer diameter of a part of the outer periphery of the drums 15L and 15R included in the drum 6 changes due to the formation of the holes 20 and the cuts 21a, the state of the change is the same between the drive pulleys 5 and 6 when the drive shaft 3 rotates. Can be equal. Accordingly, when the pair of drive pulleys 5 and 6 are driven by one drive shaft 3, the moving length of the drive wire 10 is reduced.
6 can be avoided and the drive wires 10
, And the parallelism of the carriages A and B with respect to the axis of the drive shaft 3 can be maintained.

Next, a third embodiment of the present invention will be described with reference to FIG.
It will be described based on. The same parts as those in the above embodiment are denoted by the same reference numerals, and description thereof is omitted. FIG. 12 is a vertical sectional front view showing the internal structure of the driving pulley. Although only one of them is shown, the drive pulleys 5 and 6 have a groove 24 having a U-shaped cross section in the wire winding portion 19.

Therefore, the groove 2 of the wire winding portion 19
By winding the drive wire 10 along 4, the assemblability is improved. In addition, variations in the assembling such as uneven winding of the drive wire 10 and deviation of the winding position are reduced,
The drive wire 10 can be wound more evenly, whereby the drive accuracy can be further improved. Further, it is possible to prevent the winding of the driving wire 10 from shifting or interfering with the wound driving wire 10,
Thereby, the durability of the drive wire 10 can be improved.

Next, the structure of an image forming apparatus according to a fourth embodiment of the present invention will be described with reference to FIG. The image forming apparatus 100 according to the present embodiment includes a scanner 101
And a copy machine having an image output unit 102 for printing out image data read by the scanner 101, but a modem is added to transmit image data read by the scanner 101 to the outside, The MFP may have a function as a facsimile that receives image data transmitted from the outside and prints out the image data using the image output unit 102.

The image forming apparatus 100 is a large-size paper feeder 1
It is installed at the top of 03. An image output unit 102 forms an image on the photosensitive member 104 with image data read by the scanner 101 or image data received from the outside, and transfers the image to a fed transfer sheet by a known electrophotographic method. It is a printer.

The scanner 101 has a contact glass 10
In a known configuration, a reflected image from a document placed on the document 5 is deflected by a first optical system 106 and a second optical system 107 and is imaged on a CCD sensor 109 via a converging lens 108. is there. The first optical system (illumination light source and mirror) is mounted on the carriage A, and the second optical system (mirror) is mounted on the carriage B. These carriages A and B are incorporated in the driving device 1 shown in FIG.

The effects of the driving pulleys 5 and 6 of the driving device 1 for driving the carriages A and B are as described above, and therefore the description is omitted.

[0068]

According to the first aspect of the present invention, since the driving pulley for driving the driving wire is formed by press working or forging, the number of processing steps of the driving pulley can be reduced. By using a hollow structure, weight reduction can be achieved.

According to a second aspect of the present invention, in the driving device of the first aspect, since the driving pulley has a hole through which the driving wire passes, the driving wire is wound around the driving pulley by passing the driving wire through the hole. Can be determined. Therefore, the operation of positioning and assembling the drive wire with respect to the drive pulley can be facilitated.

According to a third aspect of the present invention, in the driving device according to the first aspect, since the driving pulley has a locking means for locking the driving wire, the driving wire is fixed to the driving pulley via the locking means. Accordingly, it is possible to simplify the assembling of the drive wires to the drive pulleys without increasing the number of parts and the cost, and to improve the span accuracy of the drive wires.

The invention described in claim 4 is the first to third aspects of the present invention.
In the driving device according to any one of the above, since at least one of the driving pulleys is formed so as to be pressed into the driving shaft, by pressing the driving pulley into the driving shaft,
The structure for assembling the drive pulley to the drive shaft and the assembling work can be simplified without using new parts. Thereby, the number of assembling steps can be reduced, and the cost can be reduced.

The invention according to claim 5 provides the invention according to claims 1 to 4
In the driving device according to any one of the above, since the driving pulley can adjust the stop position in the rotation direction with respect to the driving shaft,
By adjusting the stop position of the drive pulley with respect to the drive shaft in the rotational direction, it is possible to easily correct the length of the drive wire pulled out from the drive pulley, the error in the mounting position of the drive shaft, and the like.

According to a sixth aspect of the present invention, in the driving device according to the fourth or fifth aspect, the driving pulleys are attached to both ends of the driving shaft, and these driving pulleys have the same adjustment of the stop position in the rotation direction with respect to the driving shaft. Since it is possible from the direction,
When the drive pulley fitted to the drive shaft is fixed with a fastening member such as a screw, the stop position for loosening or tightening the screw can be adjusted from the same direction, thereby
The man-hour for adjusting the position of the driving pulley can be reduced, and the adjustment can be easily performed.

The invention according to claim 7 provides the invention according to claims 1 to 6
In the driving device according to any one of the above, since the driving pulley has a flange on at least one side of a wire winding portion around which the driving wire is wound, the driving wire is attached to the driving pulley and the driving wire is rotated during the rotation operation of the driving pulley. Dropping can be prevented by the flange, and therefore, performance during rotation operation and assemblability can be improved.

According to an eighth aspect of the present invention, in the driving device according to the seventh aspect, since the flange of the driving pulley has a cut, the cut of the flange is used as a mark for winding the driving wire, so that the cost of adding parts and the like is reduced. It is possible to improve the assemblability without increasing the size. When a part of the drive wire is fixed to the inside of the drive pulley, and the drive wire is wound around the outer peripheral surface of the drive pulley, the drive wire is passed through the notch of the flange so that the drive wire is outside the flange. The need to get over from the inside can be eliminated. Thereby, the drive wire can be wrapped around the drive pulley in an orderly manner, and further, the space at the outer peripheral portion of the drive pulley can be saved.

According to a ninth aspect of the present invention, in the driving device according to the seventh aspect, since the driving pulley has a groove for holding the driving wire in the wire winding portion, the driving wire is wound along the groove of the wire winding portion. Thereby, the assemblability can be improved. In addition, variations in the assembling of the drive wire, such as uneven winding of the drive wire and displacement of the winding position, are reduced, and the drive wire can be wound more orderly.
Therefore, the driving accuracy can be further improved.

According to a tenth aspect of the present invention, in the driving device of the second aspect, the driving pulley is attached to both ends of the driving shaft, and a hole formed in the driving pulley for passing the driving wire is rotated between the driving pulleys. Direction is formed at a position where the directions are equal, so even if the outer diameter of a part of the outer periphery of the drive pulley changes due to the formation of a hole, the state of the change is that between the drive pulleys when the drive shaft rotates. Become equal. Therefore, when a pair of drive pulleys is driven by one drive shaft, it is possible to avoid that the moving length of the drive wire is generated between the drive pulleys. The parallelism of the movable body to the axis of the shaft can be maintained.

According to an eleventh aspect of the present invention, in the driving device according to the eighth aspect, the driving pulley is attached to both ends of the driving shaft, and the cut formed on the flange of the driving pulley is
Since the driving pulleys are formed at positions where the positions in the rotational direction are equal, even if the outer diameter of a part of the outer periphery of the driving pulley changes due to the formation of a cut, the state of the change is when the driving shaft rotates. , The drive pulleys are equal. Therefore, when a pair of drive pulleys is driven by one drive shaft, it is possible to avoid that the moving length of the drive wire is generated between the drive pulleys. The parallelism of the movable body to the axis of the shaft can be maintained.

According to a twelfth aspect of the present invention, the scanner includes the driving device according to any one of the first to eleventh aspects, wherein the movable body is reciprocally driven along the document table.
The same effects as in the case of the invention described in any one of 1 to 1 can be obtained, whereby a scanner with high image reading accuracy can be provided.

According to a thirteenth aspect of the present invention, there is provided an image forming apparatus capable of outputting image data with high image reading accuracy because the image forming apparatus includes the scanner and the image output part according to the twelfth aspect. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view of a driving device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a schematic structure of a drive pulley fitted to a drive shaft.

FIG. 3 is a vertical sectional front view showing details of a driving pulley.

FIG. 4 is a perspective view showing a schematic shape of a driving pulley.

FIG. 5 is a longitudinal sectional front view showing a state where a driving wire is fixed inside the driving pulley.

FIG. 6 is a side view thereof.

FIG. 7 is a side view showing an internal structure of one drive pulley according to a second embodiment of the present invention.

FIG. 8 is a side view showing the internal structure of one drive pulley symmetrical to one drive pulley shown in FIG.

FIG. 9 is a cross-sectional view showing a drum included in a pair of driving pulleys attached to both ends of the driving shaft, taken along line XX in FIGS. 7 and 8;

FIG. 10 is a cross-sectional view showing a drum included in a pair of drive pulleys along a line UU in FIGS. 7 and 8;

FIG. 11 is a cross-sectional view showing a drum included in the pair of drive pulleys along a line TT in FIGS. 7 and 8;

FIG. 12 is a longitudinal sectional front view showing an internal structure of a drive pulley according to a third embodiment of the present invention.

FIG. 13 is a vertical sectional front view showing an internal structure of an image forming apparatus according to a fourth embodiment of the present invention.

[Explanation of symbols]

 A, B Movable body 1 Driving device 3 Driving shaft 5, 6 Driving pulley 10 Driving wire 13, 16 Flange 19 Wire winding portion 20 Hole 21a, 21b Cut 22 Locking means 24 Groove 100 Image forming device 101 Scanner 102 Image output portion

 ──────────────────────────────────────────────────続 き Continued from the front page (72) Yoshiaki Nagao 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company (72) Sachiko Kinshino 1-3-6 Nakamagome, Ota-ku, Tokyo Stock F-term in Ricoh Company (reference) 2H071 CA05 DA02 3J031 BA04 BA09 BA10 BB06 BC03 CA05 5C072 AA01 BA02 BA04 BA20 MA01 MA04 MB01

Claims (13)

[Claims] 1. A drive device for moving a movable body by a drive wire driven by a plurality or a single drive pulley attached to a drive shaft, wherein the drive pulley is formed by press working or forging. A driving device characterized by the above-mentioned. 2. The drive device according to claim 1, wherein the drive pulley has a hole through which the drive wire passes. 3. The drive device according to claim 1, wherein the drive pulley has a locking means for locking the drive wire. 4. The driving device according to claim 1, wherein at least one of the driving pulleys is formed so as to be pressed into the driving shaft. 5. The drive device according to claim 1, wherein a stop position of the drive pulley in a rotation direction with respect to the drive shaft is adjustable. 6. The drive pulley is attached to both ends of the drive shaft, and the drive pulleys can adjust a stop position in a rotational direction with respect to the drive shaft from the same direction. 5. The driving device according to 5. 7. The drive device according to claim 1, wherein the drive pulley has a flange on at least one side of a wire winding portion around which the drive wire is wound. 8. The drive device according to claim 7, wherein the flange of the drive pulley has a cut. 9. The driving device according to claim 7, wherein the driving pulley has a groove for holding the driving wire in the wire winding portion. 10. The drive pulley is attached to both ends of the drive shaft, and the hole through which the drive wire passes is formed at a position where the positions of the drive pulleys in the rotational direction are equal. The drive device according to claim 2. 11. The drive pulley according to claim 8, wherein the drive pulleys are attached to both ends of the drive shaft, and the cuts are formed at positions where the drive pulleys have the same rotational position. Drive. 12. A document table, a movable body that supports a reading optical system that optically reads an image of a document placed on the document table, and reciprocally drives the movable body along the document table. A scanner comprising: the driving device according to any one of 1 to 11; 13. An image forming apparatus comprising: the scanner according to claim 12; and an image output unit that outputs an image read by the scanner.