JPH0437254A - Original still picture reader - Google Patents

Abstract

PURPOSE:To prevent a carrier from being tilted during running by devising 1st and 2nd restriction members so as to be disabled of moving in the lengthwise direction of the carrier and devising 3rd and 4th restriction members so as to be enable of moving in the lengthwise direction of the carrier and depressing them on a shaft. CONSTITUTION:Since 1st and 2nd restriction members 30,32 installed in a way not able to be moved in the lengthwise direction of a carrier have no gap with respect to a shaft in a direction in which the carrier 4 receiving a torque is going to be tilted, the means prevent occurrence of a tilt of the carrier 4. Moreover, 3rd and 4th restriction members 34,38 installed while being pressed toward the shaft 8 respectively locate the carrier 4 gradually in a direction opposite to the direction in which the carrier 4 tends to be tilted, then a load torque is not increased. Thus, the deterioration in the read picture quality due to a deviation in the image forming face of an original picture caused by a tilt of the carrier is not caused.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a still document image reading device using a contact type image sensor.

[Conventional technology]

4 and 5 show a conventional document static image reading device disclosed in, for example, Japanese Unexamined Patent Publication No. 60-260915,
In the figure, a pair of light sources (2) are provided on both sides of a pair of rod lens arrays (1).
) is provided with a photoelectric conversion element (3). Rod lens array (1), light source (2), photoelectric conversion element (
3) is mounted on the carrier (4). A glass document surface transparent plate material (5) is attached to the main body (6) of the apparatus at a constant distance from the rod lens array (1).

The sliding bearing (7) fixed to the negative end of the carrier (4) is
It is slidably attached to a shaft (8) fixed to the main body (6) of the apparatus in parallel with the document surface transparent plate (5). Thereby, the carrier (4) is positioned in the main scanning direction and supported so as to be movable in the sub-scanning direction. A wheel (9) is rotatably attached to the other end of the carrier (4). Position in the vertical direction. The electric circuit section (11) includes a light source (2
), a circuit for driving the photoelectric conversion element (3), etc., and is fixed to the carrier (4). The stay/7-bing motor (12) is connected to the device body (6) via the mounting stay (13).
A timing belt (15) is stretched between a pulley (14a) attached to the shaft of the motor (12) and another pulley (14b). The negative portion of the belt (15) is fixed to the carrier (4). When reading an image, the original (16) is placed on the original transparent plate (5) with the side to be read facing down.

With the above configuration, the light source (2) is turned on by the light source drive circuit in the electric circuit (11) in response to an external instruction during image reading, and the document (16) on the document surface transparent plate material (5) is irradiated. The reflected light from the original (]6) is imaged at the same magnification by the rod lens array (1) onto the photoelectric conversion element (3).The photoelectric conversion element (3) is a drive circuit in the electric circuit (11). The stepping motor (12) is rotated at the same time, and is sequentially converted into an electric signal in the main scanning direction.
The power is transmitted to the carrier (4) via the pulleys (1, 4a) (14b) and the timing belt (15), and the sliding bearing (7) fixed to the carrier <4) slides on the shaft (8). The carrier (4) is moved in the sub-scanning direction in the direction of arrow A.
move in a direction. Further, one end of the carrier (4) is supported by wheels (9) and rails (10),
Shift (8), rail < 10) is a transparent plate material for the original surface (5)
Since the carrier (4) is fixed parallel to the document (
16) Always move at a constant distance. In this way, by sequentially and repeatedly reading in the main scanning direction while moving the carrier (4) in the sub-scanning direction, the original (16)
Converts the image into an electrical signal and sends it to the outside as a read image signal.

[Problem to be solved by the invention]

Since the conventional document static image reading device is configured as shown in the Y-plane, the longitudinal direction of the carrier (4) is driven by the belt (15), and the other side moves by following the driving force. Show behavior. On the other hand, as shown in Figure 6, the shaft (8) and the sliding bearing (7) are made so that the outer diameter d of the shaft (8) is slightly smaller than the inner diameter of the sliding bearing (7) so that they can slide smoothly. Career (4)
During sub-scanning, the carrier (4) is tilted by the gap D-d as shown in FIG. 7, and as shown by the broken line in FIG. Since the side movement is delayed, there is a problem in that the imaged image of the original document is shifted and the quality of the read image deteriorates. In addition, in order to prevent the carrier (4) from tilting, the shaft (
8) and the sliding bearing (7) by reducing the clearance D-d.
The load torque increases and the motor becomes unable to rotate, and to prevent this, it is necessary to increase the size of the motor.
There was a problem with the large size of the device. In addition, the carrier (
Even when the span L (Fig. 6) of the sliding bearing (7) was made longer in order to make the bearing (4) less likely to tilt, there were problems such as the device becoming larger.

This invention was made to solve the above-mentioned problems, and it is possible to control the movement of the non-driving part of the carrier during carrier sub-scanning without increasing the size of the device or increasing the load torque. It is an object of the present invention to provide a still image reading device for a document in which there is no delay in image reading, that is, the quality of the read image does not deteriorate due to a shift in the imaging plane of the document image caused by tilting of the carrier.

[Means to solve the problem]

In the document static image reading device according to the present invention, a driving force is transmitted to the carrier by sandwiching the shaft between the regulating members installed on the carrier and moving along the shaft to regulate the longitudinal movement of the carrier. The first regulating member on the front end side in the carrier traveling direction and the second regulating member on the opposite side, on the rear end side in the carrier traveling direction, are made immovable in the longitudinal direction of the carrier and connected to the shaft. A third regulating member on the leading side in the carrier traveling direction, on the side where the driving force is transmitted to the carrier, and a fourth regulating member on the rear end side in the carrier traveling direction, on the opposite side. and the regulating members are movable in the longitudinal direction of the carrier and are installed by being pressed toward the shaft.

[For production]

In this invention, among the above-mentioned regulating members, the first and second regulating members, which are installed so as not to be movable in the longitudinal direction of the carrier, are connected to the shaft in the direction in which the carrier receives the driving force and tends to tilt. Since there is no gap, it prevents the carrier from tilting. In addition, the third and fourth regulating members, which are movable in the longitudinal direction of the carrier and are installed by pressing toward the shaft, slowly tilt the carrier in the opposite direction to the direction in which the carrier tends to tilt. For positioning,
No increase in load torque occurs.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figures, (4) is a carrier on which a rod lens array, a light source, a photoelectric conversion element, etc. (not shown) are loaded. (15) is a timing belt that transmits driving force from a drive power source such as a motor (not shown) to the carrier (4), and its negative portion is coupled to the carrier (4). The rollers (30), (32), (34), and (38) position the carrier (4) in the longitudinal direction of the carrier (4) on a shaft (8) fixed to the apparatus main body (not shown); A regulating member that rotates along the shaft (8),
It is installed using the following method. First, the shaft (8
) between the timing belt (15) and the carrier (4).
), which is the first regulating member on the leading side in the carrier traveling direction (direction A), and the second regulating member on the rear end side in the carrier traveling direction (direction A) on the opposite side. The rollers (32), which are regulating members, each have a pin (31).
), (33), so that it has a degree of freedom only in the direction of rotation and without any gap with the shaft (8).
Each is held in a carrier (4).

Next, hold the shaft (8〉) between the timing bells l~
(15) is connected to the carrier (4), the roller (34) is the third regulating member on the front side in the carrier traveling direction (direction A), and the roller (34) on the opposite side in the carrier traveling direction (
A direction) A roller (38) which is the fourth regulating member on the rear end side
The stay (
35) and (39), respectively. The stays (39), (39) are held by the carrier (4) so as to be movable in the longitudinal direction of the carrier (4), and are moved in the shaft (4) direction by springs (41), (37), respectively. Being pressed.

The rollers (42) and (44) are connected to the pins (43) and (
45) rotatably held on the carrier (4);
The carrier (4) is rotated along the shaft (8) to position the carrier (4) in the vertical direction with respect to the shaft (8). (9) is a wheel rotatably attached to one end of the carrier (4) opposite to the shaft (8) side, and is fixed to the device body (not shown) parallel to the shaft (8). It is supported by rails (10).

Note that the refinement of other parts of the single image reading device is the same as that shown in FIGS. 4 and 5, and will therefore be omitted.

Next, the operation will be explained. The image reading operation is the same as the conventional technique described above, and will not be described here.

Now, when power is transmitted to the timing belt (15) by a power source such as a motor (not shown), the carrier (4) starts traveling in the direction of arrow A. At this time, carrier (4)
Since the non-driving part side of the carrier (4) moves following the driving force, the non-driving part side of the carrier (4) lags in the direction of arrow B, and the carrier (4) tends to tilt in the direction of arrow B. However, since the rollers (30) and (32) have no clearance between them and the shaft (8) and are given a degree of freedom only in the direction of rotation, the carrier (4) cannot tilt in the direction of arrow B. Also, the rollers (34) and (38) are not compatible with the carrier (4).
) installed movably in the longitudinal direction, each with a shaft (
8> direction, the carrier (4) is slowly positioned in the direction opposite to the direction in which the carrier (4) is inclined in the direction of arrow B. Therefore, no increase in load torque occurs when the carrier (4) runs.

Further, the carrier (4) has rollers (4) in its vertical direction.
2), (44) and shaft (8), as well as wheels (9) and rails (10).

As a result of the above, the carrier (4) loaded with the light source, rod lens array photoelectric conversion element, etc. travels without tilting while traveling, so the image plane of the original image does not shift and the quality of the read image does not deteriorate. . Furthermore, since no increase in load torque occurs, problems such as the inability of the motor to rotate do not occur.

In the above embodiment, a roller is used as a regulating member for positioning the carrier (4) on the shaft (8) in each direction, but other types of regulating member such as a sliding member may be used.

Further, in the above embodiment, the rollers (34) and (38) that are pressed in the direction of the shaft (8) are connected to the stay (35), respectively.
, (39), but this is not intended to limit the holding method in particular, and in the above embodiment, the carrier (4) is held in each direction on the shaft (<8). Although two regulating members for positioning are installed in each direction, the number thereof is not particularly limited.

Further, in the above embodiment, a timing belt (15) is used as the power transmission means, but other means such as a wire lobe may be used.

Further, in the above embodiment, the shaft (8) of the carrier (4) is
), but it may also be of a type that transmits the driving force to the inside of the shaft (8) of the carrier (4), and the arrangement of each member may be changed. By doing so, the same effects as in the above embodiment can be achieved.

Further, in the above embodiment, a close-contact type reading device using a same-magnification optical system using a rod lens array (1) was described, but an image reading device using a reduction optical system using a mirror, a lens, etc. may also be used. The same effects as in the above embodiment are achieved.

〔Effect of the invention〕

As described above, according to the present invention, among the regulating members installed on the carrier and regulating the longitudinal movement of the carrier moving along the shaft, the side on which the driving force is transmitted to the carrier with the shaft in between The first regulating member at the front end in the carrier traveling direction and the second regulating member at the rear end in the carrier traveling direction on the opposite side are made immovable in the longitudinal direction of the carrier and have a gap with the shaft. In addition to installing without
A third regulating member on the front end side in the carrier traveling direction on the side where the driving force is transmitted to the carrier with the shaft in between, and a fourth regulating member on the opposite side on the rear end side in the carrier traveling direction are connected to each other in the longitudinal direction of the carrier. Since the structure is such that the carrier is movable in the direction and is pressed in the direction of the shaft, the carrier can be prevented from moving due to the transmitted driving force while the carrier is traveling, so the quality of the read image will not deteriorate. This has the effect of providing a compact device that does not require increasing the size of the motor or the like due to an increase in load torque.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional plan view of essential parts of an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line U-II in FIG. 1, and FIG. 5. Planar cross-sectional view 5. FIG. 4 is a perspective view of the main parts of a conventional document still image@reading device, FIG. 5 is a cross-sectional side view of the main parts showing the optical system of the device shown in FIG. 4, and FIG. 4 is a cross-sectional plan view of the main part of the carrier part showing the dimensional relationship between the bearing and the shaft of the device shown in FIG. 4. FIG. 87 is a plan view of the main part of the carrier portion showing the behavior of the carrier while the carrier is traveling in the device shown in FIG. 4. (2) Light source, (3) Photoelectric conversion element, (4
) Carrier, (5) Document surface transparent plate material, (8)...
Shaft, (15) Timing belt, (16)
・・Manuscript, (30), (32), (34), (38)・
Roller (first to fourth regulating member), (35), (
39) Arm, (37, (41) Spring. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A document surface transparent plate material on which a document is placed, a light source that illuminates the document, a photoelectric conversion element that receives reflected light from the document and converts it into an electrical signal, a carrier on which the light source, etc. is loaded, and an apparatus main body. and a shaft fixed to the carrier for slidably positioning and supporting the carrier, the document stationary image reading device having a shaft fixed to the carrier for slidably positioning and supporting the carrier, and a shaft for supporting the carrier in a longitudinal direction. comprising first to fourth regulating members that regulate movement;
Moreover, the first regulating member is located on the leading side in the carrier advancing direction on the side where the driving force is transmitted to the carrier across the shaft, and the carrier is on the opposite side of the first regulating member across the shaft. The second regulating member on the rear end side in the traveling direction is movable in the longitudinal direction of the carrier and is provided without a gap with the shaft,
the third regulating member on the leading side in the traveling direction of the carrier on the side where driving force is transmitted to the carrier across the shaft; and the carrier on the opposite side of the third regulating member across the shaft. A document stationary image reading device characterized in that the fourth regulating member on the rear end side in the traveling direction is movable in the longitudinal direction of the carrier and is installed by being pressed toward the shaft.