JPH10164312A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reader in which one drive motor is used in common for moving a scanner and for driving rotation of an original feed roller. SOLUTION: In an image reader having a scanner 3 provided freely and movably from a still original read area B to a continuous original read position C and an original feed roller 4 for a continuous original read, one of a drive motor 6 that moves the scanner 3 and drives the rotation of the original feed roller 4 via a transmission mechanism 5 is provided and the transmission mechanism 5 moves the scanner in the still original read area B in the case of reading a still original, stops the scanner 3 at the continuous original read position C in the case of reading a continuous original and drives the rotation of the original feed roller 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image reading apparatus for reading an image described on a document.

[0002]

2. Description of the Related Art Some image reading apparatuses have both a function of reading a still document and a function of reading a continuous document. In the case of a static original reading, the original placed on the platen glass
Scanning and reading are performed by a scanner device that reciprocates in the sub-scanning direction under the platen glass. In the case of continuous document reading,
Documents fed one by one by a rotating document feed roller are scanned and read by a scanner device that is stationary at a continuous document reading position.

A conventional image reading apparatus includes a driving motor for reciprocating a scanner device in a stationary document reading area and moving the scanner device from the stationary document reading area to a continuous document reading position, and a driving motor for rotating a document feed roller. And a separate motor.

[0004]

However, separately providing a motor for driving the scanner device and a motor for driving the document feed roller has a problem that the cost is increased and the weight is increased. Therefore, the present invention provides an image reading apparatus in which the movement of the scanner device and the rotation of the document feed roller are shared by one drive motor.

[0005]

Means adopted by the present invention is an image reading apparatus provided with a scanner device movably provided from a static original reading area to a continuous original reading position and an original feed roller for continuous original reading. A single drive motor for moving the scanner device and rotating the document feed roller via a transmission mechanism, wherein the transmission mechanism moves the scanner device in the static document reading area when reading a static document, In reading a document, the scanner device is stopped at the continuous document reading position and the document feed roller is rotated.

According to the present invention, the movement of the scanner device and the rotation of the document feed roller can be performed by one drive motor, and the movement of the scanner device in the stationary document reading area when reading a static document can be achieved. The transmission mechanism can select the stop of the scanner at the continuous document reading position and the rotation of the document feed roller when reading the continuous document.

The transmission mechanism includes a drive pulley meshing with a toothed belt for moving the scanner, a drive gear connected to the motor and rotating integrally with the drive pulley, and rotating the document feed roller. A driven gear, and an intermediate gear that moves together with the scanner when the scanner reaches the continuous original reading position and meshes with the driving gear and the driven gear. May be formed so as not to mesh with the drive pulley when it reaches.

When the transmission mechanism includes the toothed belt, the intermediate gear, and the like, the intermediate gear does not mesh with the driving gear and the driven gear when reading a stationary document, so that the driving force of the motor is transmitted via the driving pulley. When the continuous document is read, the intermediate gear meshes with the driving gear and the driven gear, and the driving pulley does not mesh with the toothed belt. And the intermediate gear and the driven gear are sequentially transmitted to rotate only the document feed roller.

The present invention may include a stopper for stopping the scanner at a continuous document reading position.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image reading apparatus according to the present invention will be described based on an embodiment shown in the drawings.

(First Embodiment) FIGS. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a side view showing a general outline, with intermediate parts omitted, and FIG. FIG. 3 is a side view showing a state in which only the document feed roller is rotated, showing an enlarged portion, and FIG. 3 is a side view showing a state in which only the scanner device is moved, showing an enlarged main portion.

As shown in FIG. 1, the image reading apparatus 1 has both a static original reading function and a continuous original reading function. In the case of reading a stationary document, a scanner device 3 provided with a light source that reciprocates a document (not shown) placed on the platen glass 2 in the sub-scanning direction (the direction of arrow A) under the platen glass 2. Scan and read with. In the case of continuous document reading, the document fed one by one by the rotating document feed roller 4 is scanned and read by the scanner device 3 that is stationary at the continuous document reading position C.

The image reading apparatus 1 is characterized in that the movement of the scanner 3 and the rotation of the document feed roller 4 can be selected by a single drive motor 6 via a transmission mechanism 5. The transmission mechanism 5 reciprocates the scanner device 3 in the static document reading area B when reading a static document, stops the scanner device 3 at the continuous document reading position C when reading a continuous document, and rotates only the document feed roller 4. It is configured so that

The transmission mechanism 5 includes toothed belt pulleys 7, 8 disposed near both ends in the sub-scanning direction (the direction of arrow A).
And an endless toothed belt 9 stretched between the pulleys 7 and 8 and connected 13 to the scanner 3 and connected to the output shaft 6a of the motor 6 shown in FIG. And a driven gear 11 for rotating the document feed roller 4, and an intermediate gear 12 disposed between the drive gear 10 and the driven gear 11. Intermediate gear 1
Numeral 2 is rotatably attached to the scanner device 3 and meshes with the drive gear 7 and the driven gear 8 only when the scanner device 3 reaches the continuous document reading position C. When the scanner device 3 reaches the continuous document reading position C, the toothed belt 9 prevents the driving device 7 from meshing with the driving belt 7.
A missing tooth region 9b lacking a is formed.

The intermediate gear 12 moves together with the scanner device 3 moving toward the continuous original reading position C as the driving pulley 7 rotates in the direction of the arrow F by the drive of the motor 6, and moves along with the driving gear 10 and The engagement with the driven gear 11 is started. The intermediate gear 12 that has started to mesh with the drive gear 10
As a result, the clutch is urged in the direction of the arrow E by receiving the transmitting force from the motor, so that stable engagement is maintained. Further, the scanner device 3 receives the biasing force and abuts on the stopper 14 so as to press the stopper 14, thereby maintaining the stopped state. The scanning device 3 is the stopper 1
When the toothed belt 9 is stopped in contact with the toothed belt 4, the toothless belt 9 is wound around the driving pulley 7 to make the driving pulley 7 idle, so that the driving force of the motor 6 is not transmitted to the toothed belt 9.

In order to move the scanner 3 in the continuous original reading state stopped at the continuous original reading position C to the stationary original reading area B, the motor 6 is rotated in the reverse direction. Motor 6
, The drive gear 10 and the drive pulley 7 move in the direction of the arrow G.
When rotated in the direction, the intermediate gear 12 is urged in the direction of arrow H by the transmission force from the drive gear 10 and starts moving together with the scanner device 3 and the toothed belt 9. The toothed belt 9 that has started moving, as shown in FIG. 3, starts meshing the teeth 9a with the drive pulley 7, and moves the scanner device 3 in the direction of arrow H to move the stationary document reading area B (see FIG. 1). ).

The structure of the intermediate gear 12 is not limited to the structure to be attached to the scanner device 3, and although not shown, the meshing position meshed with the drive gear 10 and the driven gear 11, and the two gears 10, It is also possible to arrange so as to be slidable along the moving direction of the scanner device 3 between a non-meshing position where it does not mesh with the gear 11. In this case, the intermediate gear 12 is urged by a spring toward the non-meshing position when the scanner device 3 is located in the stationary document reading area B, and is pressed when the scanner device 3 reaches the continuous document reading position C. The urging force is pressed by the scanner device 3 to move to the meshing position.

As shown in FIG. 1, the driven gear 11 includes a pulley 15 that rotates integrally with the driven gear 11 and an intermediate pulley 1.
6 and the toothed belt 18, and the intermediate pulley 1.
A toothed belt 19 is stretched around the pulley 6 and the pulley 17 that rotates integrally with the document feed roller 4, and the driving force from the motor 6 is transmitted to the document feed roller 4. Note that the driven gear 11 may be configured to rotate integrally with the document feed roller 4, and the intermediate pulley 16 and the like may be omitted.

The scanner device 3 is of a type in which a light source and a light receiving element are integrally incorporated, and is not shown in the drawings.
The type in which the light source is moved by the toothed belt 9 and the reflecting mirror is moved at half the moving speed of the light source, and the reflected light is received by the fixedly arranged light receiving element is appropriately selected.

(Second Embodiment) FIG. 4 shows a second embodiment of the image reading apparatus according to the present invention, and is a partially cutaway side view showing a state in which the scanner device is moved. .

The difference between this embodiment and the first embodiment is the transmission mechanism 20. The transmission mechanism 20 uses a toothed belt 9 having no toothless region so that the driving pulley 7 and the toothed belt 9 always mesh with each other, and a driven gear 21 and a driven gear 11 that rotate integrally with the driving pulley 7.
The drive gear 22 is selectively meshed with either one of them. The structure other than this difference is substantially the same as that of the first embodiment, and the same reference numerals denote the same components.

The drive gear 22 is rotatably supported on an arm 23 pivotally supported on the output shaft 6a of the drive motor 6 as a center, and meshes with an output gear 24 fixed to the output shaft 6a. It is like that. The drive gear 22 is moved by operating an operating tool 25 such as a solenoid that swings an arm 23. When reading a stationary original, drive gear 2
The scanner device 3 is reciprocated in the stationary document reading area B (see FIG. 1) by meshing the driven document 2 with the driven gear 21. Conversely, during continuous document reading, immediately after the scanner device 3 reaches the continuous document reading position C, the drive gear 22
Is engaged with the driven gear 11 to rotate the document feed roller 4.

[0023]

In the image reading apparatus according to the first aspect of the present invention, the movement of the scanner and the rotation of the document feed roller are shared by one drive motor, so that the cost and weight can be reduced. Can be planned.

The image reading apparatus according to the second aspect of the present invention can be realized with a simple structure, so that the cost and weight can be further reduced.

The image reading apparatus according to the third aspect of the present invention does not require a sensor or the like for stopping the scanner.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention;
It is the side view which carried out the intermediate omission which shows the whole outline | summary.

FIG. 2 is an enlarged side view of a main part in the embodiment, and is a side view showing a state in which only a document feed roller is rotated.

FIG. 3 is an enlarged side view of a main part in the embodiment, and is a side view showing a state in which only the scanner device is moved.

FIG. 4 is an enlarged view of a main part according to a second embodiment of the present invention, and is a partially cutaway side view showing a state in which a scanner device is moved.

[Explanation of symbols]

 3. Scanner device 4. Document feed roller for continuous document reading 5. Transmission mechanism 6. Drive motor B. Static document reading area C. Continuous document reading position

Claims (3)

[Claims] 1. An image reading apparatus comprising: a scanner device movably provided from a stationary document reading area to a continuous document reading position; and a document feed roller for continuous document reading, the movement of the scanner device and the rotation of the document feed roller. One drive motor that performs the movement via a transmission mechanism, the transmission mechanism,
An image reading apparatus wherein the scanner is moved in a static original reading area when reading a static original, and the scanner is stopped at a continuous original reading position and the original feed roller is rotated when reading a continuous original. . 2. The transmission mechanism includes: a drive pulley that meshes with a toothed belt that moves the scanner; a drive gear that is connected to the motor and rotates together with the drive pulley; A driven gear, and an intermediate gear that moves together with the scanner when the scanner reaches the continuous original reading position and meshes with the driving gear and the driven gear. 2. The image reading apparatus according to claim 1, wherein the toothless region is formed so as not to mesh with the drive pulley when the reading position is reached. 3. The image reading apparatus according to claim 1, further comprising a stopper for stopping the scanner at a continuous document reading position.