JP2002252741A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reader with excellent quality that prevents a lope having a spiral part from being damaged. SOLUTION: Since a width w2 of an inter-teeth groove 9c2 of a pulley component 9B is wider than a width w1 of an inter-teeth groove 9c1 of a pulley component 9A by about 20% or more, even when the positions of the two pulley components 9A, 9B are somewhat deviated in the case of incorporation, the inter-teeth groove 9c has a linear width w1 (at least nearly coincident with a width w of the spiral part, and, specifically, wider by a fitting common difference) the two pulley components 9A, 9B, the spiral part is meshed with the inter-teeth groove 9c without causing torsion so that it is prevented that a synchromesh rope is damaged because the adhesion of a spiral wire of the synchromesh rope is exfoliated because of the overload of the torsion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus for reading an original on a platen glass by scanning an image sensor.

[0002]

2. Description of the Related Art Conventionally, as this type of image reading apparatus,
There is one shown in FIG.

In FIG. 8, an image reading apparatus 200 places an original on an original platen glass 103 provided on a frame 101, closes an original cover 102, and places the original on the original platen glass 1.
The image reading is performed by pressing the button 03.

The frame body 101 also serves as an exterior cover,
The components described below are disposed inside. Frame body 101
A document table glass 103 on which a document is placed is provided on the upper surface of the document table. A document cover 102 is rotatably attached to the frame 101 so that the document is sandwiched between the document table glass 103.

[0005] Inside the frame 101, the image of the original loaded on the platen glass 103 is read by being guided by the guide shaft 106 by the rotation of the motor 105 and scanning in parallel along the platen glass 103. A reading unit 104 is provided.

The reading unit 104 includes three color (R, G, B) LEDs, which are light sources for illuminating the original, a rod lens array for forming reflected light from the original on a light receiving element of an image sensor, and An image sensor is incorporated. In the reading unit 104, the three color LEDs are sequentially switched and turned on, and the image sensor reads the reflected light from the document for each color to perform color separation reading.

[0007] The reading unit 104 is arranged on a holder 107. The holder 107 includes a slider 10
8 is provided, and the slider 108 can slide on the guide shaft 106. Therefore, the reading unit 104 is guided by the guide shaft 106 by the holder 107 having the slider 108 that slides on the guide shaft 106.

The holder 107 is provided with a motor 105 as a drive source for moving the reading unit 104 while being guided by the guide shaft 106.

Here, the end of the guide shaft 106 for guiding the reading unit 104 is supported by a bearing of the frame 101 and is fixed to the frame 101 with screws to prevent rotation and position.

In the frame 101, the driving force from the motor 105 is applied to the holder 107, that is, the holder 107.
A transmission mechanism for transmitting the image data to the reading unit 104 held by the image forming apparatus is accommodated.

The transmission mechanism includes a synchromesh pulley 109 which rotates by the rotation of a motor 105, and a frame 1
And a synchromesh rope 110 that converts the rotation of the synchromesh pulley 109 into a linear movement of the reading unit 104.

[0012] The synchromesh pulley 109 is shown in FIG.
(B) As shown in FIG.
A groove around which 0 is wound is formed.

The synchromesh rope 110 has one end fixed to the frame 101 and the other end supported by biasing means (not shown) to maintain a predetermined tension. Further, as shown in FIG. 10, the synchromesh rope 110 is provided with a core 110a and a spiral 110b.
The core portion 110a and the spiral portion 110b of the synchromesh rope 110 are formed by winding a spiral wire around the core wire and bonding the core wire with an adhesive.

Then, the synchromesh rope 110
Is a synchromesh pulley 10 as shown in FIG.
9, the rotation of the synchromesh pulley 109 causes the synchromesh pulley 109 itself to move linearly in the direction in which the synchromesh rope 110 extends.

Accordingly, the driving force of the motor 105 is transmitted to the synchromesh pulley 109, and the synchromesh pulley 109 rotates forward and backward in accordance with the forward and reverse rotation of the motor 105, so that the reading unit 104 is moved to the platen glass 103. Can move back and forth in parallel.

Further, the main board 1 is provided inside the frame 101.
11 are provided, and the reading unit 104 and the motor 1
The flat cable 112, which is the control signal path 05, is connected.

[0017]

However, in the case of the above-described prior art, the following problems have occurred.

The synchromesh pulley 109 is used to regulate the movement of the synchromesh rope 110 as shown in FIG.
As shown in (b), in the outer peripheral groove around which the synchromesh rope 110 is wound, a groove (interdental groove 109c) of a predetermined pitch of the synchromesh pulley 109 meshing with the spiral portion 110b of the synchromesh rope 110.
And an annular groove 109d into which the core 110a of the synchromesh rope 110 is fitted.

Such a synchromesh pulley 10
In the case of manufacturing the pulley part 9A, first, as shown in FIG. 9A, the pulley part 109A is divided into two parts by an annular groove 109d in which the core 110a of the synchromesh rope 110 at the bottom of the outer circumferential groove is fitted. , 109B are molded, and after molding, the pulley parts 109A, 109B are integrally manufactured by welding or the like.

The two pulley parts 109A, 109B
12, the interdental groove 109c provided in the outer peripheral groove of the two pulley parts 109A, 109B does not become linear over the two pulley parts 109A, 109B, but is shifted. May occur.

As shown in FIG. 13, the displacement of the interdental groove 109c is caused by the spiral portion 1 of the synchromesh rope 110 wound around the outer circumferential groove of the synchromesh pulley 109.
10b is twisted, and due to the overload of the twist,
The adhesion of the spiral wire to the core wire of the synchro mesh rope 110 was peeled off, and the synchro mesh rope 110 could be damaged.

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 provide an image reading apparatus having excellent quality for preventing breakage of a rope having a spiral portion. It is in.

[0023]

According to the present invention, there is provided a pulley having an interdental groove between teeth provided at a predetermined pitch on an outer periphery thereof, the pulley being rotated by driving a rotary drive source. And a rope that has a spiral portion and a linear core that mesh with the interdental groove of the pulley, and that is wound around the outer periphery of the pulley and converts the rotation of the pulley into linear motion, and a rope that is converted by the rope. An image reading device that reciprocates by a linear motion and reads an image of a document, wherein the pulley is formed by integrating two parts separated by an outer peripheral position around which the core of the rope is wound. On one side of the split pulley, an outer inter-tooth groove is formed to have a groove width substantially matching the width of the spiral portion of the rope, and on the other side, an outer inter-tooth groove is formed in the rope. The width of the spiral Characterized in that also is formed in a large groove width.

A pulley having an interdental groove between teeth provided at a predetermined pitch on the outer periphery, the pulley being rotated by driving a rotary driving source;
A rope having a spiral portion meshing with the interdental groove of the pulley and a linear core, being wound around the outer periphery of the pulley and converting the rotation of the pulley into linear motion, a linear motion converted by the rope; An image reading means for reciprocating and reading a document image, wherein the pulley has a structure in which the pulley divided into two parts at an outer peripheral position around which the core of the rope is wound is integrated. On both sides of the divided pulley, the inter-tooth groove on the outer periphery is formed to have a groove width wider than the width of the spiral portion of the rope.
When the divided pulleys are integrated, the width of the interdental groove that is common to the same straight line on both sides from the position where the positions of the teeth on both sides are aligned in the same straight line substantially matches the width of the spiral portion of the rope. It is characterized by being integrated in the range up to the position where

Accordingly, the inter-tooth groove on one side of the split pulley is formed to have a groove width substantially matching the width of the spiral portion of the rope, and the inter-tooth groove on the other side is wider than the width of the spiral portion of the rope. The width of the structure and the inter-tooth grooves on both sides are formed to be wider than the width of the spiral part of the rope, and the positions of the teeth on both sides are common to the same straight line on both sides from the position aligned in the same straight line The spiral width of the rope that is wound around the outer circumference of the pulley is not twisted by adopting a configuration in which the groove width of the interdental groove is slightly shifted and integrated until it reaches a position that approximately matches the width of the spiral portion of the rope. In addition, it is possible to prevent the rope from being broken due to the peeling of the adhesion of the spiral wire to the core wire due to the overload of the twist.

[0026]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the dimensions of the components described in this embodiment,
The materials, shapes, relative arrangements, and the like are not intended to limit the scope of the present invention only to them unless otherwise specified.

(First Embodiment) An image reading apparatus according to a first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing the image reading apparatus according to the first embodiment.

In FIG. 1, an image reading apparatus 100 places an original on a platen glass 3 provided on a frame 1, closes an original cover 2 and presses the original against the platen glass 3 to read an image. Is what you do.

The frame 1 also serves as an exterior cover, and has components to be described later disposed therein. An original table glass 3 on which an original is placed is provided on the upper surface of the frame 1. A document cover 2 is rotatably attached to the frame 1 so that the document is sandwiched between the document table glass 3.

In the frame 1, the rotation of the motor 5
A reading unit 4 is provided which reads an image of a stacked original on the original platen glass 3 by being guided by the guide shaft 6 and scanning in parallel along the original platen glass 3.

The reading unit 4 includes three color (R, G, B) LEDs, which are light sources for illuminating the original, a rod lens array for forming reflected light from the original on a light receiving element of an image sensor, and An image sensor is incorporated. In the reading unit 4, the LEDs of the three colors are sequentially switched and turned on,
The color separation reading is performed by the image sensor reading the reflected light from the document for each color.

The reading unit 4 is arranged on a holder 7. A slider 8 is provided on the holder 7, and the slider 8 is slidable on the guide shaft 6. For this reason, the reading unit 4 includes the guide shaft 6
Is guided by the guide shaft 6 by a holder 7 having a slider 8 that slides on the guide shaft 6.

The holder 7 is provided with a motor 5 as a drive source for moving the reading unit 4 while being guided by the guide shaft 6.

Here, the end of the guide shaft 6 for guiding the reading unit 4 is supported by a bearing of the frame 1 and is fixed to the frame 1 with screws to prevent rotation and position.

A transmission mechanism for transmitting the driving force from the motor 5 to the holder 7, that is, the reading unit 4 held by the holder 7, is housed inside the frame 1.

The transmission mechanism includes a synchromesh pulley 9 that rotates by the rotation of the motor 5 and a synchromesh rope 10 that is stretched inside the frame 1 and converts the rotation of the synchromesh pulley 9 into a linear motion of the reading unit 4.
And

As shown in FIG. 3, the synchromesh pulley 9 has an outer peripheral groove around which the synchromesh rope 10 is wound. The specific configuration of the synchromesh pulley 9 will be described later.

The synchromesh rope 10 has one end fixed to the frame 1 and the other end supported by a biasing means (not shown) to maintain a predetermined tension. In addition, the synchro mesh rope 10 has a core 10a as in the conventional FIG.
And a spiral part 10b. Core part 10a and spiral part 10b of synchromesh rope 10
Is a spiral wire wound around the outer periphery of the core wire,
It is configured by being bonded to the core wire with an adhesive.

The synchromesh rope 10 is
Similar to the related art in FIG. 11, it is wound around the outer circumferential groove of the synchromesh pulley 9, and the rotation of the synchromesh pulley 9 causes the synchromesh pulley 9 itself to move linearly in the direction in which the synchromesh rope 10 extends.

Accordingly, the driving force of the motor 5 is transmitted to the synchromesh pulley 9, and the synchromesh pulley 9 rotates forward and reverse in accordance with the forward and reverse rotation of the motor 5, so that the reading unit 4 moves to the platen glass 3. Can move back and forth in parallel.

Further, inside the frame 1, a main board 11 is provided, and a flat cable 12 which is a control signal path of the reading unit 4 and the motor 5 is connected.

Next, the structure of the synchromesh pulley 9 which is a feature of the present invention will be described.

As shown in FIG. 3, the synchronous mesh pulley 9 is provided with a spiral portion 10b of the synchronous mesh rope 10 in an outer circumferential groove around which the synchronous mesh rope 10 is wound.
A groove between the teeth (interdental groove 9c) of a predetermined pitch of the synchromesh pulley 9 meshing with the
And an annular groove 9d into which the core 10a is fitted.

When manufacturing the synchromesh pulley 9, first, as shown in FIG. 2, the synchromesh pulley 9 is divided into two parts by an annular groove 9 d into which the core 10 a of the synchromesh rope 10 at the bottom of the outer peripheral groove is fitted. To form pulley parts 9A and 9B.

In FIG. 2, one of the two divided pulley parts 9A has the width w1 of the interdental groove 9c1 meshing with the spiral part 10b of the synchromesh rope 10 substantially equal to the width w of the spiral part 10b of the synchromesh rope 10. Specifically, it is formed with a width wider by the fitting tolerance.

The other of the two divided pulley parts 9B has the width w2 of the interdental groove 9c2 meshing with the spiral portion 10b of the synchromesh rope 10, and the width w2 of the interdental groove 9c of the pulley part 9A.
It is formed with a width that is about 20% or more wider than the width w1 of c1.

Then, the formed pulley parts 9A, 9B
Are integrated by welding or the like to form a synchromesh pulley 9
To produce When the two pulley parts 9A and 9B are integrated, predetermined positioning is performed, but the positioning between the two pulley parts 9A and 9B may be slightly shifted.

In this embodiment, the width w2 of the interdental groove 9c2 of the pulley component 9B is about 20% or more wider than the width w1 of the interdental groove 9c1 of the pulley component 9A. Even if the positioning between the two pulley parts 9A and 9B is slightly shifted, the width w1 of the interdental groove 9c1 can be secured within the range of the width w2 of the interdental groove 9c2.

That is, as shown in FIG. 3, the inter-groove 9c of the integrated synchromesh pulley 9 has a linear width w1 (at least the spiral of the synchromesh rope 10) over the two pulley parts 9A and 9B. The width substantially coincides with the width w of the portion 10b, specifically, a width wider by the fitting tolerance.)
Can be provided.

Therefore, as shown in FIG. 4, when the synchromesh rope 10 is wound around the outer circumferential groove of the synchromesh pulley 9, the spiral portion 10b having the width w of the synchromesh rope 10 becomes two of the interdental grooves 9c. The spiral portion 10b of the synchromesh rope 10 can be engaged with the interdental groove 9c without being twisted, because it can be fitted straight into the linear width w1 extending over the pulley components 9A and 9B.

As described above, in the present embodiment, since the spiral portion 10b of the synchromesh rope 10 wound around the outer periphery of the synchromesh pulley 9 does not twist, the twist of the synchromesh rope 1
It is possible to prevent the adhesion of the 0 spiral wire to the core wire from being peeled off and the synchromesh rope 10 from being damaged.

(Second Embodiment) FIGS. 5 to 7 show a second embodiment. Unlike the first embodiment, each interdental groove 9c1 of the pulley parts 9A, 9B is different from that of the first embodiment.
The width w3 of 9c2 is formed to be 20 to 30% wider than the width w of the spiral portion 10b of the synchromesh rope 10, and the linear minimum width w extending over the pulley parts 9A and 9B.
4 is secured to be larger than the width w of the spiral portion 10b and integrated.

Since other structures and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof will be omitted. Therefore, in the present embodiment, only the configuration of the synchromesh pulley 9 which is a feature of the present invention will be described.

Synchromesh pulley 9 of the present embodiment
As shown in FIG. 6, in order to restrict the movement of the synchromesh rope 10, the synchronous mesh pulley 9 meshes with the spiral portion 10b of the synchronous mesh rope 10 in an outer circumferential groove around which the synchronous mesh rope 10 is wound.
And the annular groove 9 into which the core 10a of the synchromesh rope 10 is fitted.
and d are formed.

When the synchromesh pulley 9 is manufactured, first, as shown in FIG. 5, the synchromesh pulley 9 is divided into two parts by an annular groove 9d into which the core 10a of the synchromesh rope 10 at the bottom of the outer peripheral groove is fitted. To form pulley parts 9A and 9B.

In FIG. 5, one of the two divided pulley parts 9A and 9B has a width w3 of interdental grooves 9c1 and 9c2 that mesh with the spiral portion 10b of the synchromesh rope 10.
With the spiral part 10b of the synchromesh rope 10.
Is wider than the width w of about 20 to 30% or more.

Then, the formed pulley parts 9A, 9B
Are integrated by welding or the like to form a synchromesh pulley 9
When manufacturing the same, even if the positioning between the two pulley parts 9A and 9B is slightly shifted, the linear minimum width w4 extending over the pulley parts 9A and 9B is inserted into the interdental groove 9c by the spiral portion of the synchromesh rope 10. 10b are formed so as to be wider than the width w, and the minimum width w4 is secured.

That is, the formed pulley parts 9A and 9B are integrated from the position where the tooth positions of the pulley parts 9A and 9B are aligned in the same straight line (the position where the minimum width w4 is also the width w3) and the interdental groove 9c. The minimum width w4 of the straight line extending over the pulley parts 9A and 9B is the spiral portion 1 of the synchromesh rope 10.
This is performed in a range up to a position which substantially matches the width w of 0b, specifically, a width which is wider by the fitting tolerance.

Therefore, as shown in FIG. 7 (a), the minimum width w4 is also the same as the width w3, or as shown in FIG. 7 (b), the minimum width w4 is the width w of the spiral portion 10b by the fitting tolerance. When the synchromesh rope 10 is wound around the outer peripheral groove of the synchromesh pulley 9, the spiral portion 10b having the width w of the synchromesh rope 10 becomes two pulley parts 9A of the interdental groove 9c. ,
9B can be fitted to a linear minimum width w4,
The spiral portion 10b of the synchromesh rope 10 can be engaged with the interdental groove 9c without twisting.

As described above, in the present embodiment, the spiral portion 10b of the synchromesh rope 10 wound around the outer periphery of the synchromesh pulley 9 does not twist, so that the twist of the synchromesh rope 1
It is possible to prevent the adhesion of the 0 spiral wire to the core wire from being peeled off and the synchromesh rope 10 from being damaged.

[0061]

As described above, according to the present invention, the interdental groove on one side of the split pulley is formed to have a groove width substantially equal to the width of the spiral portion of the rope, and the interdental groove on the other side is formed. The configuration in which the groove width is wider than the width of the spiral part of the rope, and the interdental groove on both sides is formed in the groove width wider than the width of the spiral part of the rope, and the positions of the teeth on both sides are aligned in the same straight line It is wound around the outer periphery of the pulley by adopting a configuration in which the groove width of the inter-tooth groove common to the same straight line on both sides is slightly shifted and integrated within a range from the position to the position that approximately matches the width of the spiral part of the rope. Since the spiral part of the rope is not twisted, it is possible to prevent the rope from being broken due to the peeling of the adhesion of the spiral wire to the core wire due to the overload of the twist.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an image reading apparatus according to a first embodiment.

FIG. 2 is a front view showing a state where the synchromesh pulley according to the first embodiment is divided into two parts during molding.

FIG. 3 is a front view showing an integrated state of the synchromesh pulley according to the first embodiment.

FIG. 4 is an explanatory diagram showing an interdental groove of the synchromesh pulley according to the first embodiment.

FIG. 5 is a front view showing a state where a synchromesh pulley according to a second embodiment is divided into two parts during molding.

FIG. 6 is a front view showing an integrated state of a synchromesh pulley according to a second embodiment.

FIG. 7 is an explanatory diagram showing an interdental groove of a synchromesh pulley according to a second embodiment.

FIG. 8 is a perspective view showing a conventional image reading apparatus.

FIG. 9 is a front view showing a divided state and an integrated state of a conventional synchromesh pulley during molding.

FIG. 10 is a front view showing a synchromesh rope.

FIG. 11 is a front view showing a state where a synchromesh rope is wound around a synchromesh pulley.

FIG. 12 is a front view showing a state in which a tooth gap of a conventional synchromesh pulley has been shifted and integrated.

FIG. 13 is an explanatory diagram showing an interdental groove in a case where a shift occurs in the interdental groove of the conventional synchromesh pulley.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 frame 2 document cover 3 platen glass 4 reading unit 5 motor 6 guide shaft 7 holder 8 slider 9 synchromesh pulley 9A, 9B pulley parts 9c interdental groove 9c1 interdental groove 9c2 interdental groove 9d annular groove 10 synchromesh rope 10a core portion 10b spiral portion 11 main board 12 flat cable 100 image reading device

Claims (2)

[Claims] A pulley having an interdental groove between teeth provided at a predetermined pitch on an outer periphery thereof, the pulley being rotated by driving of a rotary drive source, a spiral portion meshing with the interdental groove of the pulley, and a linear core portion. A rope that is wound around the outer periphery of the pulley and converts the rotation of the pulley into linear motion; and image reading means that reciprocates by the linear motion converted by the rope and reads a document image. In the image reading device, the pulley is configured such that the pulley divided into two parts at an outer peripheral position where the core of the rope is wound is integrated, and one side of the divided pulley is an inter-dental groove on the outer periphery. Is formed with a groove width substantially matching the width of the spiral portion of the rope, and on the other side, an inter-tooth groove on the outer periphery is formed with a groove width wider than the width of the spiral portion of the rope. Image reading device. 2. A pulley which has an interdental groove between teeth provided at a predetermined pitch on the outer periphery and is rotated by driving of a rotary drive source, a spiral portion and a linear core which mesh with the interdental groove of the pulley. A rope that is wound around the outer periphery of the pulley and converts the rotation of the pulley into linear motion; and image reading means that reciprocates by the linear motion converted by the rope and reads a document image. In the image reading apparatus, the pulley has a structure in which two parts are integrated at an outer peripheral position around which the core of the rope is wound. It is formed in a groove width wider than the width of the spiral portion of the rope, and when the two divided pulleys are integrated, the positions of the teeth on both sides are common to the same straight line on both sides from the position aligned in the same straight line The width of the interdental groove is Image reading apparatus characterized by integrated within a range of up to a width substantially matching the position of the spiral portion of the serial rope.