JP2003110814A - Inertial weight for drive shaft of image processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inertial weight for the drive shaft of an image processor capable of adjusting the value of an inertial moment, by providing the inertial weight attached to the output shaft of a motor with an inertial weight auxiliary body which protrudes/depresses in the radial direction, as a slight vibration of a motor is transferred to a carriage to make the acquired image data unstable if the speed of carriage is raised in response to a demand for faster process. SOLUTION: An inertia 40 comprises an inertia main body 41 attached to an output shaft 9b of a motor 9, and inertial weight auxiliary bodies 42 slidable in the radial direction of the inertia main body 41 on the surface of the inertia main body 41 with almost constant intervals. By changing the amount of protrusion of the inertial weight auxiliary body 42, the inertial moment of the inertia 40 is adjusted. After the adjustment, a locking screw 43 is tightened to fix the inertial weight auxiliary body 42.

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 irradiating a photographic original image or an original document with a light beam and sequentially reading and scanning image information formed on the original photographic image or the original document, or a photosensitive material such as photographic paper. The present invention relates to an image processing device such as an image writing device which prints while sequentially reproducing and scanning, and an image processing device for stabilizing the output rotation of a drive motor that drives a carriage along a photographic original image or a document for scanning. Of the drive shaft inertia weight.

[0002]

2. Description of the Related Art For example, an image reading apparatus, such as a copying machine or a scanner, which reads an image of an original document displayed on a paper surface and performs various processes, irradiates the original document with light from a light source lamp such as a fluorescent lamp. The reflected light is made incident on a light receiving portion provided with a photoelectric conversion device such as a CCD. The light receiving unit includes the photoelectric conversion device and an imaging lens for forming an image on the photoelectric conversion device, and the imaging lens and the photoelectric conversion device must be in a predetermined positional relationship.

On the other hand, a reflecting mirror or the like is used to guide the reflected light reflected by the document to the light receiving portion. In a stationary original image reading apparatus, the optical path length from the original to the light receiving portion needs to be kept constant even when the irradiation position on the original changes, so that the reflecting mirror or the like should be moved along the original. There is.

The structure of an image reading apparatus of this type is shown in FIGS. FIG. 6 is a perspective view showing a schematic structure of the original stationary image reading apparatus 1. Image reading device 1
Two guide plates 2b and 2e are provided in a shelf shape on the inner side surface of the longitudinal wall portion 2a of the housing 2, and the full rate carriage 3 and the half rate carriage 4 are mounted on these guide plates 2b and 2e, respectively. These carriages 3 and 4 are guide plates
Guided by 2b and 2e respectively, they move in the longitudinal direction of the housing 2. Further, a platen glass (not shown) is attached to the upper surface of the housing 2, and a document is placed on the platen glass. A light source lamp 5 such as a fluorescent lamp is mounted on the full rate carriage 3, and the original is illuminated by the light source lamp 5. A light receiving unit 20 including an imaging lens 6 and a photoelectric conversion device 7 such as a CCD (charge imaging device) is provided at an appropriate position on the bottom plate 2c of the housing 2.

The full rate carriage 3 is provided with a first reflecting mirror (not shown), and the half rate carriage 4 is provided with a second reflecting mirror and a third reflecting mirror (not shown). The light emitted from the light source lamp 5 and reflected from the original is
The first reflecting mirror, the second reflecting mirror, and the third reflecting mirror are sequentially reflected to pass through the imaging lens 6 and enter the photoelectric conversion device 7. The first reflecting mirror and the second reflecting mirror An optical path from the document to the photoelectric conversion device 7 is formed by the mirror and the third reflecting mirror. Since the entire area of the original must be illuminated when acquiring image information of the original, the full rate carriage 3 can move over the entire area of the platen glass. Even with the movement of the full rate carriage 3, the length of the optical path to the photoelectric conversion device 7 must be constant. For this reason, the half-rate carriage 4 is moved by a half of the movement amount of the full-rate carriage 3 in synchronization with the full-rate carriage 3 so that the optical path has a constant length.

FIG. 7 is a perspective view showing the outline of a driving mechanism for moving the carriages 3 and 4 in synchronization. A drive shaft 8 whose axial direction is a direction orthogonal to the scanning direction of the carriages 3 and 4 is rotatably supported at one end of the housing 2 in the longitudinal direction, and a driven pulley 8a is provided at the center thereof. It is fitted. On the other hand, a motor 9 is arranged on the bottom plate 2c of the housing 2, and an output shaft of this motor 9 has a drive side pulley.
9a is fitted. A first drive belt 11a is wound around the drive pulley 9a and the first intermediate pulley 10a,
A second drive belt 11b is attached to the second intermediate pulley 10b integrally formed with the first intermediate pulley 10a and the driven pulley 8a.
Have been passed over. That is, the output rotation of the motor 9 is appropriately decelerated and transmitted to the driven pulley 8a, and the drive shaft 8
Is designed to rotate at a low speed. Therefore, the drive shaft 8
Rotation of the carriage becomes smooth, and the carriage 3, which is driven by this,
It is possible to suppress the vibration when the 4 moves as much as possible. In particular, suppressing this vibration is advantageous in reducing the size of the image reading apparatus.

A take-up pulley 13 is fitted on both ends of the drive shaft 8, and a central portion of a wire rope 14 is wound around the take-up pulley 13 at an appropriate number of turns. A pair of guide pulleys 15, 16 are coaxially provided on the side surface of the half rate carriage 4.
Are rotatably supported about a direction orthogonal to the scanning direction. A guide pulley 17 is rotatably supported at the end of the housing 2 opposite to the side where the drive shaft 8 is disposed, about a direction orthogonal to the scanning direction. A bracket 2d is provided at an appropriate position on the wall 2a of the housing 2. The take-up pulley 13, the wire rope 14, the guide pulleys 15, 16, 17 and the bracket 2d are provided inside the housing 2 on both sides of the scanning areas of the carriages 3 and 4.

One end of the wire rope 14 is fixed to the bracket 2d, and the full rate carriage 3
Wind the guide pulley 15 located on the opposite side to
The full-rate carriage 3 is connected by the connecting portion 18, the winding pulley 13 is wound, the guide pulley 17 and the guide pulley 16 are sequentially wound, and the other end of the tension spring 19 is a tension coil spring or the like. It is hooked on the side wall of the housing 2 via.

The connecting portion 18 is formed by a tongue piece portion 18a formed by projecting a part of a bottom plate constituting the full rate carriage 3, and a female screw formed on the connecting portion 18 is tightened with a fixing screw 18b. The wire rope 14 is sandwiched between the fixing screw 18b and the tongue portion 18a, and the full rate carriage 3 and the wire rope 14 are connected to each other.

Further, Japanese Patent Laid-Open No. 2001-100326 discloses a photographic printing apparatus which is an image reproducing / scanning apparatus for forming an image on a photosensitive material. Are sequentially irradiated with light to form an image on the photosensitive material, and a carriage mechanism for moving the position where the light is irradiated is used.

[0011]

In recent years, there has been a demand for speeding up of processing by an image processing apparatus, and there is a demand for speeding up of image reading and writing. For this reason, increasing the moving speed of the carriage has come to be performed. However, when the moving speed of the carriage is increased, even if the vibration of the motor 9 is small,
The carriage is likely to be affected by the vibration, and the image data of the obtained original may become unstable.

In order to stabilize the rotation of the motor 9, as shown in FIG. 7, an inertia 30 which is an inertia weight is fitted to the output shaft of the motor 9. For example, JP-A-11-3039
Japanese Patent Laid-Open No. 42-42 discloses an inertial weight for a drive shaft of this type.

By the way, as the processing speed increases, the number of models of the image reading apparatus also increases, and the processing speed varies depending on the model. If parts can be made common to different models, part management becomes easy and cost reduction can be promoted. Therefore, it is preferable that the inertia 30 can be made common.

Further, when the rotation of the motor 9 becomes high in order to increase the moving speed of the carriage, the inertia is increased.
Even if the inertia moment of 30 is as designed, the motor 9
The rotation of is not stable, and the inertia moment needs to be finely adjusted.

Therefore, according to the present invention, the inertia weight for the drive shaft of the image processing apparatus can be made common as much as possible even if the motor speed is different, and the output shaft of the motor can be easily finely adjusted for stabilization. It is intended to be provided.

[0016]

As a technical means for achieving the above-mentioned object, an inertia weight for a drive shaft of an image processing apparatus according to the present invention carries an optical scanning member and drives along an original. In the inertial weight for the drive shaft that suppresses the vibration during the operation of the image processing apparatus including the carriage that is moved by the main body of the inertial weight fitted to the output shaft of the drive motor of the carriage, Providing an appropriate number of inertia weight auxiliary bodies so that they can project from the outer circumference, and adjusting the amount of protrusion of the inertia weight auxiliary bodies to change the inertia moment of the inertia weight main body,
A feature is that a fixing member for fixing after adjustment is provided.

When the amount of protrusion of the inertia weight auxiliary body from the main body of the inertia weight is changed, the inertia moment is changed. Therefore, the amount of protrusion is adjusted so as to stabilize the output rotation of the motor. Therefore, even if the rotation speeds of the motors are different, the common inertial weight can be used. Further, since the amount of protrusion is adjusted, the magnitude of the moment of inertia can be finely adjusted, and the motor can be stably rotated as much as possible. Moreover, the amount of protrusion of each inertia weight auxiliary body can be made different, and the rotation balance of the motor can be easily adjusted.

Further, the inertial weight for the drive shaft of the image processing apparatus according to the invention of claim 2 is characterized in that the inertial weight auxiliary body is provided mainly on the inertial weight so as to be slidable in the radial direction.

When the inertia weight auxiliary body is slid in the radial direction, the amount of protrusion from the main body of the inertia weight is changed, so that the magnitude of the moment of inertia can be adjusted.

In the inertial weight for the drive shaft of the image processing apparatus according to the third aspect of the present invention, the inertial weight auxiliary body is swingably provided mainly on the inertial weight, and the amount of protrusion from the outer periphery is adjusted by the swing. The feature is that it is possible.

When the inertial weight auxiliary body is swung, it can be projected from the outer circumference of the inertial weight main body, so that the inertia moment changes according to the amount of projection, and the magnitude of the inertia moment can be adjusted. Moreover, since the amount of protrusion from the outer circumference of the inertial weight main body is small with respect to the swing angle, the moment of inertia can be easily finely adjusted.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An inertial weight for a drive shaft of an image processing apparatus according to the present invention will be specifically described below based on the illustrated preferred embodiments. In this embodiment,
A light source is mounted on the carriage as an image processing device.
An image reading apparatus is shown as an example in which the original is irradiated with light while moving the light source and the image data formed on the original is read from the reflected light.

As shown in FIG. 5, the drive side pulley 9a is fitted on the output shaft 9b of the motor 9. Output shaft
The drive pulley 9a is protruded from the drive pulley 9a, and the inertia 30 which is an inertia weight is fitted to the protruded tip portion.

FIGS. 1 and 2 show an inertia 40 which is a first embodiment of a drive shaft inertial weight according to the present invention. FIG. 1 is a front view and FIG. 2 is a side view. The inertia 40 is composed of an inertia main body 41 and an inertia weight auxiliary body 42 having appropriate weights. The inertia main body 41 is formed in a disk shape, and a boss portion 41a is formed in the center thereof as shown in FIG. 2, and a shaft hole 41b into which the output shaft 9b of the motor 9 is fitted is formed in the boss portion 41a. And the inertia main body 41.

The inertia weight auxiliary body 42 is composed of the inertia main body 41.
Are provided at four locations at substantially equal intervals. The inertia weight auxiliary body 42 is formed of a substantially rectangular parallelepiped with an appropriate weight, and a long hole 42 whose longitudinal direction is the longitudinal direction of the rectangular parallelepiped is formed in the central portion thereof.
a is formed. On the other hand, a female screw portion is formed on the surface of the inertia main body 41, and a fixing screw 43 penetrating the elongated hole 42a is screwed with the female screw portion.

The long hole 42a of the inertia weight auxiliary body 42 is aligned with the female screw portion (not shown) of the inertia main body 41, and the fixing screw 43 is passed through the long hole 42a and screwed into the female screw portion. If tightened, inertia weight auxiliary body 42 will
Fixed to. In this state, the motor 9 is operated to drive the image reading apparatus 1, and image data such as a test chart is acquired to confirm the operation stability. At this time, if the fixing screw 43 is loosened, the inertia weight auxiliary body 42 is moved to the inertia main body 41.
On the other hand, since it can slide in the radial direction, the magnitude of the inertia moment of the inertia 30 is adjusted by moving it to a proper position. By this adjustment, the position of the inertia weight auxiliary body 42 with respect to the inertia main body 41 is determined in a state where the image obtained from the test chart becomes clear.

That is, by adjusting the position of the inertia weight auxiliary body 42, the magnitude of the inertia moment of the inertia 30 can be changed. Therefore, an appropriate moment of inertia can be set according to the rotation speed of the motor 9, and the output rotation of the motor 9 can be adjusted to be stable by finely adjusting the magnitude of the inertia moment.
Moreover, since this adjustment only adjusts the position of the inertia weight auxiliary body 42 with respect to the inertia 41, the adjustment can be performed by a simple operation.

3 and 4 show an inertia 50 which is a second embodiment of the drive shaft inertial weight according to the present invention. FIG. 3 is a front view and FIG. 4 is a side view. In this embodiment, the inertia weight auxiliary body 52 is swingably attached to the inertia main body 51. A boss portion 51a is formed on the inertia main body 51, and the shaft hole 51b is formed on the boss portion 51a.
It is formed so as to penetrate through the inertia main body 51. The inertia shaft 50 is attached to the output shaft 9b by fitting the output shaft 9b of the motor 9 into this shaft hole.

The inertia weight auxiliary body 52 is formed of a flat plate having an appropriate thickness, as shown in FIG. 3, in an external shape substantially similar to the external shape of a curved ball, or in any other suitable shape. A through hole through which the support screw 53 passes is formed, and the support screw 53 is formed.
It is possible to swing around 53. Mainly inertia
A female screw portion to which the support screw 53 is screwed is formed on the 51. On the tip end side of the inertia weight auxiliary body 52, there is formed a cam hole 52a having a shape along an arc suitable for performing the operation described later.

On the other hand, in the outer peripheral edge portion of the inertia main body 51, a guide hole 51 is formed along an arc centered on the axis of the shaft hole 51b.
c are formed in four places at equal intervals. Further, an inertia weight auxiliary body holding portion 55 is rotatably fitted to the boss portion 51a, and a cam pin 54 penetrating the guide hole 51c is provided at a tip end portion of the inertia weight auxiliary body holding portion 55. It is provided.
The inertia weight auxiliary body holding portion 55 has a fixing screw 56 as a fixing means.
Is provided, and the inertia weight auxiliary body holding portion 55 is fixed to the boss portion 51a by tightening the fixing screw 56.

The inertia weight auxiliary body holding portion 55 is attached to the boss portion.
With the cam pin 54 fitted in the guide hole 51a,
It passes through c and further through the cam hole 52a.

In the inertial weight for drive shaft according to the second embodiment, the through hole formed in the base end portion of the inertial weight auxiliary body 52 is aligned with the female thread portion of the inertia main body 51, and the support screw 53 is The weight auxiliary body 52 is passed through the through hole at the base end portion and screwed into the female screw portion of the inertia main body 51. In this state, the inertia weight auxiliary body 52 becomes swingable around the support screw 53. While fitting the inertia weight auxiliary body holding portion 55 into the boss portion 51a of the inertia main body 51, insert the cam pin 54 into the guide hole 51c.
And the cam hole 52a.

With the cam pin 54 penetrating the guide hole 51c and the cam hole 52a, the inertia weight auxiliary body holding portion 55 is attached to the boss portion 51.
When rotated around a, the cam pin 54 will
Turn in c. When this cam pin 54 turns, the cam hole
Since the wall surface of the cam hole 52a is pushed while moving inside the 52a, the inertia weight auxiliary body 52 swings around the support screw 53. This swinging causes the inertia weight auxiliary body 52 to project beyond the outer periphery of the inertia main body 51. Moreover, the protruding amount of the inertia weight auxiliary body 52 is changed depending on the position of the cam pin 54 with respect to the cam hole 52a. Therefore, the amount of protrusion of the inertia weight auxiliary body 52 is adjusted so that the inertia 50 has an appropriate moment of inertia by appropriately setting the rotation angle of the inertia weight auxiliary body holding portion 55. That is, the protrusion amount of the inertia weight auxiliary body 52 is adjusted so that the image obtained by the image reading apparatus 1 becomes the clearest, and when the adjustment is completed, the fixing screw 56 is tightened to support the inertia weight auxiliary. The body holding portion 55 may be fixed.

In the above-described embodiment, the case where the inertial weight for the drive shaft is mounted on the image reading device has been described, but the invention is not limited to the image reading device, and for example, a light-sensitive material including image data may be provided on a stopped photosensitive material. It can also be mounted on an image writing device such as a photo printing device using a carriage mechanism that moves the position of irradiating light in order to sequentially form the image on the photosensitive material.

[0035]

As described above, according to the drive shaft inertial weight of the image processing apparatus of the present invention, the magnitude of the moment of inertia of the inertial weight fitted to the output shaft of the motor for driving the carriage can be determined. Since it can be changed, it can be adjusted according to the rotation speed of the motor to an inertia moment of a size that stabilizes the rotation. Therefore, the vibration due to the fluctuation of the rotation of the motor can be eliminated, the carriage can be moved stably, the stable image data can be acquired, and the image formed based on the image data can be made clearer. .

According to the drive shaft inertial weight of the image processing apparatus of the second aspect, the amount of protrusion from the main body of the inertial weight can be easily changed by sliding the inertial weight auxiliary body. Therefore, the magnitude of the moment of inertia can be easily changed, and the moment of inertia can be adjusted to an appropriate magnitude.

According to the drive shaft inertial weight of the image processing apparatus of the third aspect, the amount of protrusion from the main body of the inertial weight can be easily changed by swinging the inertial weight auxiliary body. Therefore, the magnitude of the moment of inertia can be easily changed, and the moment of inertia can be adjusted to an appropriate magnitude.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a drive shaft inertial weight of an image processing apparatus according to the present invention, and is a front view of the inertial weight.

FIG. 2 is a side view of the inertial weight according to the first embodiment.

FIG. 3 is a front view of an inertial weight according to a second embodiment.

FIG. 4 is a side view of the inertial weight according to the second embodiment.

FIG. 5 is a side view for explaining a mounting state of an inertia weight for speed stabilization.

FIG. 6 is a schematic perspective view illustrating the structure of the image reading apparatus.

FIG. 7 is a schematic perspective view for explaining a drive mechanism of a carriage of a document stationary type image reading apparatus suitable for including the drive shaft inertial weight according to the present invention.

[Explanation of symbols]

1 Image reading device 3 full rate carriage 4 Half rate carriage 5 light source lamp 6 Imaging lens 7 Photoelectric conversion device 8 drive shafts 9 motors 9a Drive side pulley 9b output shaft 14 wire rope 30 inertia (weight of inertia) 40 inertia (weight of inertia) 41 Mainly inertia 41a Boss 41b shaft hole 42 Inertial weight auxiliary body 43 fixing screw 50 inertia (inertial weight) 51 Inertia 51a Boss 51b shaft hole 52 Inertial weight auxiliary body 52a circular arc through hole 53 fixing screw 54 Cam pin 55 Inertial weight auxiliary body holder 56 fixing screws

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Osamu Shinohara             1-324 Uetakecho, Saitama City, Saitama Prefecture             Fuji Photo Optical Co., Ltd. F-term (reference) 5C072 AA01 BA13 MA06 XA01

Claims (3)

[Claims] 1. An inertial weight for a drive shaft, which suppresses vibration during operation of an image processing apparatus, which comprises a carriage that carries an optical scanning member and is moved along a document by a drive means. The inertia weight main body fitted to the main body is provided with an appropriate number of inertia weight auxiliary bodies capable of projecting radially from the outer circumference of the inertia weight main body. An inertial weight for a drive shaft of an image processing apparatus, which is provided with a fixing member that has a variable moment and is fixed after adjustment. 2. The inertial weight for a drive shaft of an image processing apparatus according to claim 1, wherein the inertial weight auxiliary body is provided mainly on the inertial weight so as to be slidable in a radial direction thereof. 3. The image processing apparatus according to claim 1, wherein the inertia weight auxiliary body is swingably provided mainly on the inertia weight, and the amount of protrusion from the outer circumference can be adjusted by the swing. Inertial weight for drive shaft.