JP2003173073A - Writing head adjuster and image forming device having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing head adjuster capable of adjusting at least one of a distance from the side of a main body device to a writing head, a distance from that to a photoreceptor drum and the scanning inclination of the writing head relative to the photoreceptor drum and to provide an image forming device having the adjuster. <P>SOLUTION: A moving member 5 is moved in the axial direction of the photoreceptor drum 222 by a distance adjustment screw 9 provided on a longitudinal end. Also, an abutting member 7 pressed to the moving member 5 by an elastic member 8 is moved toward or away from the photoreceptor drum 222. Thus, a distance H between an LED head 227 and the photoreceptor drum 22 is adjusted. Accordingly, the distance from the side of the main body device to the LED head 227 and the distance from that to the photoreceptor drum 222 can be adjusted. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing unit used in an image forming apparatus such as a digital multi-function peripheral, a printer, and a facsimile, and more particularly to a gap between a writing head and a photosensitive drum and a photosensitive drum of the writing head. The present invention relates to a write head adjustment device that adjusts the inclination of a scanning direction with respect to the scanning direction, and an image forming apparatus including the same.

[0002]

2. Description of the Related Art A writing head used in an electrophotographic image forming apparatus such as a digital multifunction peripheral, a printer and a facsimile, for example, an LED (Light Emit).
The tingDiode) head and the like are positioned and attached to the photosensitive drum at predetermined intervals.

However, it is very difficult to assemble the write head and the photosensitive drum so that the distance between them is the same, and variations occur during assembly. Therefore, it is necessary to adjust the position of the write head for each device after assembly.

In view of these problems, a clamshell type image forming apparatus is known in which the lower part of the LED head can be opened. In the clamshell type image forming apparatus, since the lower part of the LED head can be opened when the writing head and the photosensitive drum are positioned at a predetermined distance, the mounting position of the writing head can be adjusted.

Further, Japanese Patent Laid-Open No. 5-278266 discloses a printer device capable of adjusting the distance between the writing head and the photosensitive drum. In the conventional technique disclosed in Japanese Patent Laid-Open No. 5-2782266, one frame to which the LED head is attached is configured to be openable above the main body frame, and the distance between the LED head and the photosensitive drum is set from above the main body device. Can be adjusted.

[0006]

However, the LED
In the case of an image forming apparatus having a structure in which the clamshell system that can open the lower part of the head cannot be adopted and an image forming apparatus in which an empty space cannot be provided for downsizing, once the apparatus is assembled, the writing head Adjustment tools, etc., cannot be inserted into the position where the position is adjusted. Therefore, it is necessary to disassemble the device in order to adjust the position of the LED head, and there is a problem that adjustment takes time.

In the printer disclosed in the prior art of Japanese Patent Laid-Open No. 5-278266, since the position of the LED head is adjusted from above the LED head, the LED
If there is a component of the printer device above the head, it is necessary to disassemble the printer device. Also LED
Although it is possible to adjust the distance between the head and the photosensitive drum, it is not possible to adjust the scanning inclination of the LED head with respect to the photosensitive drum.

Further, since the writing head is adjusted by performing test printing and based on the printing result, an image forming apparatus capable of adjusting the LED head in a printable state as soon as possible is desired. .

An object of the present invention is to provide a write head adjusting device capable of adjusting at least one of a distance between a writing head and a photosensitive drum from a side portion of a main body device and a scanning inclination of the writing head with respect to the photosensitive drum, and a writing head adjusting device therefor. An image forming apparatus is provided.

[0010]

SUMMARY OF THE INVENTION The present invention is a write head adjusting device for adjusting the position of a write head that is arranged to face a cylindrical photosensitive drum that is rotatably supported between frames of a main body device. A moving member that moves substantially parallel to the axis of the photosensitive drum, a contact member that is provided at both ends of the writing head and that contacts the moving member, and an elastic member that urges the contact member toward the moving member. A write head adjusting device comprising a flexible member and adjusting means provided on the frame side of the main body device to move the moving member to adjust the distance between the write head and the photosensitive drum.

According to the present invention, the moving member can be moved substantially parallel to the axis of the photosensitive drum by the adjusting means provided on the frame side of the main body device in which the cylindrical photosensitive drum is rotatably supported. it can. The contact members contact the moving members provided at both ends of the writing head, and the contact members are biased toward the moving member by the elastic member.
With the movement of the moving member in the axial direction of the photosensitive drum,
The distance between the writing head and the photoconductor drum can be adjusted by moving the contact member in the direction toward the photoconductor drum or in the direction away from the photoconductor drum. Therefore, the distance between the writing head and the photosensitive drum can be adjusted from the side of the main body device.

Further, the present invention provides a write head adjusting device for adjusting the position of a write head which is arranged so as to face a cylindrical photosensitive drum which is rotatably supported between frames of a main body device. Support shafts arranged substantially parallel to each other, a frame member that holds the write head and is supported by the support shafts, and a frame member provided on the frame side of the main body device, wherein the frame member is twist-rotated about the support shafts. The adjusting means for adjusting the scanning inclination of the writing head held by the frame member with respect to the photoconductor drum is provided.

According to the invention, the support shaft is arranged substantially parallel to the photosensitive drum, and the support shaft supports the frame member for holding the write head. The adjusting means provided on the frame side of the main body device in which the cylindrical photosensitive drum is rotatably supported can twist and rotate the frame member about the support shaft, whereby the writing held by the frame member is performed. The scanning inclination of the head with respect to the photosensitive drum can be adjusted. Therefore, the scanning inclination of the writing head with respect to the photosensitive drum can be adjusted from the side of the main body device. The adjustment of the scanning inclination means that the longitudinal direction of the writing head is parallel to the axial direction of the photosensitive drum within a cylindrical surface centered on the rotational axis of the photosensitive drum.

Further, the present invention is a writing head adjusting device for adjusting the position of a writing head which is arranged so as to face a cylindrical photosensitive drum which is rotatably supported between frames of a main body device. A support shaft arranged substantially in parallel, a moving member that moves along the support shaft and moves substantially parallel to the axis of the photosensitive drum, and a frame member supported by the support shaft and both ends of the writing head. An abutting member that is provided to abut the moving member and the frame member, an elastic member that biases the abutting member toward the moving member and the frame member, and an abutting member that is provided on the frame side of the main body device, First adjusting means for moving the moving member to adjust the distance between the writing head and the photoconductor drum, and a photosensitive head of the writing head held by the frame member by twisting and rotating the frame member about the support shaft. A write head adjustment apparatus, characterized in that it comprises a second adjustment means for adjusting the scanning inclination with respect to the drum.

According to the present invention, the support shaft is arranged substantially parallel to the photosensitive drum, and the support shaft supports the frame member holding the write head. A moving member is moved along the support shaft by the first adjusting means provided on the frame side of the main body device in which the cylindrical photosensitive drum is rotatably supported, and is moved substantially parallel to the axis of the photosensitive drum. You can The contact member abuts on the moving member and the frame member provided at both ends of the writing head, and the abutting member is urged toward the moving member and the frame member by the elastic member. Along with the movement of the moving member in the axial direction of the photoconductor drum, the contact member is moved in the direction toward the photoconductor drum or in the direction away from the photoconductor drum so that the write head and the photoconductor drum are separated from each other. The distance can be adjusted. Also,
The second adjusting means provided on the frame side of the main body device is capable of twisting and rotating the frame member about the support shaft, thereby adjusting the scanning inclination of the writing head held by the frame member with respect to the photosensitive drum. be able to. Therefore, it is possible to adjust the distance between the writing head and the photosensitive drum from the side portion of the main body device and the scanning inclination of the writing head with respect to the photosensitive drum.

In the present invention, at least one of the moving member and the contact member has an inclined surface inclined in the axial direction of the photosensitive drum, and the contact member is guided by the inclined surface to move. Is used to adjust the distance between the writing head and the photosensitive drum.

According to the present invention, at least one of the moving member and the abutting member has an inclined surface inclined in the axial direction of the photosensitive drum. Therefore, by moving the moving member in the axial direction of the photoconductor drum, the contact member can be guided along the inclined surface toward the photoconductor drum or away from the photoconductor drum. That is, by moving the moving member substantially parallel to the axis of the photosensitive drum, the contact member can be moved in the direction perpendicular to the axial direction of the photosensitive drum, and the contact member between the writing head and the photosensitive drum can be moved. The distance can be adjusted.

Further, the present invention is characterized in that the moving member is provided for both abutting members provided at both ends of the write head.

According to the present invention, since the moving member is provided for both the abutting members provided at both ends of the writing head, the distance between the both ends of the writing head and the photosensitive drum can be adjusted individually. You can Therefore, the distance between the write head and the photoconductor drum can be adjusted with high accuracy and easily along the axial direction of the photoconductor drum.

According to the present invention, the moving member includes a protruding piece protruding toward the frame side of the main body device, and the frame member is
An opening portion is provided for confirming the positional relationship between the writing head and the photoconductor drum based on the positional relationship with the projecting piece.

According to the present invention, the moving member is provided with a projecting piece that projects toward the frame of the main body device, and the frame member is provided with an opening through which the projecting piece can project. When the moving member is moved by the adjusting means to adjust the distance between the write head and the photoconductor drum, the moving member moves to move the projecting piece. Therefore, depending on the positional relationship between the opening and the projecting piece. , The positional relationship between the writing head and the photosensitive drum can be confirmed.

In the present invention, the axial direction of the photosensitive drum is the X-axis direction, and the direction perpendicular to the X-axis direction and extending from the axial line of the photosensitive drum to the moving member is the Y-axis direction. When the direction perpendicular to the Y-axis direction is the Z-axis direction, the elastic member has the Y-axis one end of the first contact member provided at one end of the write head, and the Y-axis with respect to the moving member. In the Y-axis direction, the other end of the Y-axis direction is urged in the Z-axis direction with respect to the frame member, and one end of the second contact member provided in the other end of the write head in the Y-axis direction is used as the moving member. To Y
The writing head is positioned by urging in the axial direction and the Z-axis direction and urging the other end portion in the Y-axis direction against the frame member in the X-axis direction and the Z-axis direction.

According to the present invention, one end of the write head can be positioned in the Y-axis direction and the Z-axis direction, and the other end can be positioned in the X-axis direction, the Y-axis direction and the Z-axis direction. Can be positioned in all directions of the X-axis direction, the Y-axis direction, and the Z-axis direction. Also, the first
Since the Y-axis one end and the other end of the moving member and the Y-axis one end and the other end of the second moving member are not individually positioned in the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively. It is possible to prevent the writing head from twisting when the frame member is twisted and rotated about the support shaft.

According to the present invention, the moving member has a recess with which one end of the second contact member in the Y-axis direction abuts, and the bottom of the recess is an inclined surface inclined in the X-axis direction. The writing head is positioned in the Y-axis direction and the Z-axis direction by being urged by the elastic member so that the contact member comes into contact with the bottom portion and the side surface.

According to the present invention, the moving member has a recess with which one end of the second contact member in the Y-axis direction abuts. The bottom of the recess is formed as an inclined surface that inclines in the X-axis direction, and the resilient member urges the bottom of the recess and the side surface of the recess to contact the second contact member. Direction and Z-axis direction positioning can be performed.

Further, according to the present invention, the frame member has a locking portion with which the other end of the second contact member in the Y-axis direction is locked, and the locking portion has a tip portion in the Z-axis direction. A wedge-shaped notch is formed, and the writing head is positioned in the X-axis direction and the Z-axis direction by urging the elastic member so that the first abutting member abuts on the bottom of the notch. Is characterized by.

According to the present invention, the frame member has a locking portion for locking the other end of the second contact member in the Y-axis direction. A wedge-shaped notch having a tip in the Z-axis direction is formed in the locking portion. By urging the elastic member so that the first contact member comes into contact with the two places on the bottom of the notch, it is possible to perform positioning in the X-axis direction and the Z-axis direction by the urging force in one direction.

In the present invention, a second inclined surface inclined in the Z-axis direction is formed on the bottom of the recess, and the recess is X-shaped.
The cross-sectional shape perpendicular to the axis is wedge-shaped.

According to the present invention, the bottom of the recess has a Z
A second inclined surface that is inclined in the axial direction toward the photoconductor drum is formed. By contacting the second inclined surface formed on the bottom of the recess, the first contact member easily contacts the side surface of the recess, and is biased in one direction to urge the first contact member in the Y-axis direction. And, the positioning in the Z-axis direction can be reliably performed.

Further, the present invention is characterized in that the frame member has lower rigidity than that of the writing head.

According to the present invention, since the frame member is lower in rigidity than the writing head, the frame member is twisted and rotated to move the writing head supported by the frame member, and the scanning tilt of the writing head with respect to the photosensitive drum. Can be adjusted. Also, when the frame member is twisted and deformed,
It is possible to prevent the writing head from being twisted and deformed.

According to the present invention, an electrostatic latent image is formed on the cylindrical photosensitive drum, which is provided with the writing head adjusting device and is rotatably supported between the frames, by the writing head held by the writing head adjusting device. The image forming apparatus is characterized in that a formed electrostatic latent image is developed with toner, and the developed image is transferred to a recording member to obtain an image formed product.

According to the present invention, an electrostatic latent image can be formed on the cylindrical photosensitive drum rotatably supported between the frames by the write head held by the write head adjusting device. A high-quality image can be formed by developing the electrostatic latent image formed on the photosensitive drum with toner and transferring it to the recording member. Further, since the position of the writing head can be adjusted from the side portion of the main body device, it is possible to perform the adjustment work while executing the test printing.

According to the present invention, the write head adjusting device is detachably attached to the frame together with the write head as one unit, and the positioning of the unit with respect to the frame is provided by a notch provided on one side of the frame. And a hole provided on the other side.

According to the present invention, the write head adjusting device is detachably attached to the frame of the main body device together with the write head as one unit. Therefore, when the write head is replaced, the write head adjusting device together with the write head is removed from the frame of the main body device. Can be removed and replaced. Further, the frame is provided with a notch on one side and a hole is provided on the other side, and the unit is positioned on the frame by these, so that the write head is reliably positioned with respect to the photosensitive drum. be able to.

According to the present invention, the writing head adjusting device is provided, and an electrostatic latent image is formed on the cylindrical photosensitive drum rotatably supported between the frames by the writing head held by the writing head adjusting device. An image forming apparatus for forming an electrostatic latent image, developing the formed electrostatic latent image with toner, and transferring the developed image to a recording member to obtain an image-formed product.
The write head adjusting device is configured to be attachable to and detachable from the frame together with the write head as one unit, and the unit is positioned with respect to the frame by contacting one side of the support shaft with a notch provided in one side portion of the frame. The image forming apparatus is characterized in that the unit is positioned by contacting and inserting the other side of the support shaft into a hole provided in the other side portion.

According to the present invention, an electrostatic latent image can be formed on the cylindrical photosensitive drum rotatably supported between the frames by the write head held by the write head adjusting device. A high-quality image can be formed by developing the electrostatic latent image formed on the photosensitive drum with toner and transferring it to the recording member. Further, since the position of the writing head can be adjusted from the side portion of the main body device, it is possible to perform the adjustment work while executing the test printing. Further, the write head adjusting device is detachably attached to the frame of the main body device as one unit together with the write head. Therefore, when the write head is replaced, the write head adjusting device can be removed from the frame of the main body device and replaced. it can. In addition, one side of the support shaft is brought into contact with a notch provided on one side portion of the frame, and the other side of the support shaft is inserted into a hole provided on the other side of the frame, so that the writing head is moved relative to the photosensitive drum. Can be positioned reliably.

According to the present invention, an electrostatic latent image is formed on the cylindrical photosensitive drum, which is provided with the writing head adjusting device and is rotatably supported between the frames, by the writing head held by the writing head adjusting device. An image forming apparatus for forming an electrostatic latent image, developing the formed electrostatic latent image with toner, and transferring the developed image to a recording member to obtain an image-formed product.
An adjusting means is arranged at one end of the frame member, one end of the frame member is rotatably supported on one side of the frame about a support shaft, and the other end of the frame member is fixed on the other side of the frame. The image forming apparatus is characterized in that one end of the frame member is twisted and rotated about the support shaft by the adjusting means to adjust the scanning inclination of the writing head held by the frame member with respect to the photosensitive drum. .

According to the present invention, an electrostatic latent image can be formed on the cylindrical photosensitive drum rotatably supported between the frames by the write head held by the write head adjusting device. A high-quality image can be formed by developing the electrostatic latent image formed on the photosensitive drum with toner and transferring it to the recording member. Further, since the position of the writing head can be adjusted from the side portion of the main body device, it is possible to perform the adjustment work while executing the test printing. Further, one end of the frame member of the writing head adjustment device is rotatably provided with respect to one side part of the frame, and the other end of the frame member is fixed with respect to the other side part of the frame. The adjusting means is arranged at one end of the frame member, and by twisting and rotating the frame member around the support shaft, the scanning inclination of the writing head held by the frame member with respect to the photosensitive drum can be adjusted.

[0040]

1 is a sectional view schematically showing the structure of a digital color copying machine (hereinafter referred to as a copying machine) 1 which is an image forming apparatus according to an embodiment of the present invention.

The copying machine 1 is provided with a document table 111 and an operation panel (not shown) on the upper part of the main body, and an image reading section 110 and an image forming section 210 inside the main body. The upper surface of the document placing table 111 is supported so as to be openable and closable with respect to the document placing table 111, and has a predetermined positional relationship with the document placing table 111 and has a double-sided automatic document feeder (RADF;
An rsing Automatic Document Feeder) 112 is provided.

The copying machine 1 is an electrophotographic image forming apparatus capable of copying color images. An image of a document placed on the document table 111 or a double-sided automatic document feeder 11
The image of the original document conveyed by the image reading unit 11
The image of the read original is read by the image forming unit 21.
0 to 1st to 4th image forming stations Pa, Pb, P
Reproduced on the recording paper 100 with c and Pd. The first image forming station Pa reproduces the image of the black component of the original image on the recording paper 100, the second image forming station Pb reproduces the image of the cyan component of the original image on the recording paper 100, and the third image. The forming station Pc reproduces the image of the magenta component of the original image on the recording paper 100, and the fourth image forming station Pd reproduces the image of the yellow component of the original image on the recording paper 100. First to fourth image forming stations P
Since a to Pd have the same configuration, they will be collectively described as the image forming station P.

FIG. 2 is an enlarged sectional view showing the structure of the image forming station P of the image forming section 210. The image forming station P is a unit that forms a toner image on the recording paper 100. The image forming station P has a cylindrical photosensitive drum 222 that is horizontally supported rotatably between frames of the copying machine 1, a charger 223 that uniformly charges the photosensitive drum 222, and a surface of the photosensitive drum 222. A developing device 224 that attaches toner to the formed electrostatic latent image to develop it, a transfer discharger 225 that transfers the developed toner image on the surface of the photoconductor drum 222 to the recording paper 100, and the surface of the photoconductor drum 222. And a cleaning device 226 for removing the toner remaining on the surface. The charger 2
23, 224, the transfer discharger 225, and the cleaning device 226 are sequentially arranged along the rotation direction of the photosensitive drum 222. Further, a transfer / transport belt 216 for transporting the recording paper 100 is provided between the photosensitive drum 222 and the transfer discharger 225, and the recording paper 100 is transported in the arrow Z direction. The photoconductor drum 222 rotates in the direction of arrow F about a rotation axis L1 extending in a direction perpendicular to the paper surface of FIGS. 1 and 2.

The image forming station P also includes an LED head 227 which is a writing head. The LED head 227 is provided above the photoconductor drum 222 and its longitudinal direction is substantially parallel to the axial direction of the photoconductor drum 222.
The LED head 227 is arranged between the charger 223 and the developing device 224 provided along the rotation direction of the photoconductor drum 222, and irradiates the surface of the photoconductor drum 222 charged by the charger 223 with light. Form an electrostatic latent image.

The LED head 227 is an LED board unit formed by linearly forming light emitting diodes emitting dot light modulated according to image data on the board,
And the light from the light emitting diode to the photosensitive drum 22.
Lens array and LED head 22 for forming an image on the surface of No. 2
It is configured to include a base member forming a skeleton 7. The base member extends in the longitudinal direction of the LED head 227 and is formed of a highly rigid metal block. Also LED
Since the head 227 generates heat, the base member is made of aluminum having good thermal conductivity. Thereby, heat generation of the LED head 227 can be suppressed. Also, by using aluminum for the base member, L
The ED head 227 can have sufficient rigidity, and the LED head can be made lightweight. Also, L
Both ends of the base member project from both ends of the ED head 227 to form the head support portion 2.

FIG. 3 shows the LED head 227 and this LED.
FIG. 9 is a perspective view of a writing unit configured by a writing head adjusting device 3 holding a head 227. The writing head adjustment device 3 holds the LED head 227, adjusts the distance between the LED head 227 and the photoconductor drum 222, and controls the photoconductor drum 22 of the LED head 227.
Adjust the scan tilt for 2. Here, the adjustment of the scanning inclination means that the longitudinal direction of the writing head is set to the photosensitive drum 222.
This is to be parallel to the axial direction of the photoconductor drum 222 within a cylindrical surface centered on the rotation axis line. The writing head adjusting device 3 is attached at both longitudinal ends thereof to the frame of the copying machine 1 on which the photosensitive drum 222 is supported.

FIG. 4 is a front sectional view of the writing unit. 5A is an enlarged front sectional view showing one end of the writing unit, and FIG. 5B is an enlarged front sectional view showing the other end of the writing unit. 6A is a cross-sectional view taken along the section line AA of FIG. 4, and FIG.
FIG. 5 is a cross-sectional view as seen from the section line B-B in FIG. 4.

The write head adjusting device 3 is provided so as to be movable along the support shaft 4 and the support shaft 4 which are arranged substantially parallel to the photosensitive drum 222, and moves so as to be substantially parallel to the axis of the photosensitive drum 222. A member 5, a frame member 6 supported by the support shaft 4, an abutting member 7 provided at both ends of the LED head 227 and abutting the moving member 5 and the frame member 6, and the abutting member 7 is a moving member 5. The spring 8 which is an elastic member for urging the side and the frame member 6 side, the frame side of the copying machine 1, that is, the longitudinal direction end portion of the frame member 6, and the LED.
It is configured to include first adjusting means 9 for adjusting the distance H between the head 227 and the photosensitive drum 222, and second adjusting means 10 for adjusting the scanning inclination of the LED head 227 with respect to the photosensitive drum 222.

In the following description, the axial direction of the photosensitive drum 222 will be referred to as the X-axis direction, and the direction perpendicular to the X-axis direction and extending from the axial line of the photosensitive drum 222 toward the moving member 5 will be referred to as the Y-axis direction. The direction perpendicular to the direction and the Y-axis direction is the Z-axis direction. In this embodiment, the X-axis direction and the Z-axis direction are horizontal directions, and the Y-axis direction is a vertical direction.

The abutting member 7 is a pin member fixedly provided on the head supporting portions 2 at both ends of the LED head 227 and extending in a direction perpendicular to the longitudinal direction of the LED head (left and right direction in FIG. 4). is there. The contact member 7 extends in the Y-axis direction,
The upper end, which is one end in the Y-axis direction, abuts the moving member 5,
The lower end, which is the other end in the axial direction, contacts the frame member 6. The contact member 7 includes a first contact member 7a provided at one end of the LED head 227 and a second contact member 7b provided at the other end of the LED head 227.

The moving member 5 is provided for both of the contact members 7 provided at both ends of the LED head 227. The moving member 5 includes a first moving member 5a with which a first contact member 7a provided at one end of the LED head 227 contacts.
And a second moving member 5b with which the second contact member 7b provided at the other end of the LED head 227 abuts. The moving member 5 moves along the support shaft 4 along the photosensitive drum 222.
Is provided so as to be movable substantially parallel to the axis of the. In particular,
As shown in FIGS. 5 and 6, the moving member 5 is provided by being fitted into the support shaft 4. The moving member 5 is urged to both ends in the axial direction of the support shaft 4 by the spring 11 which is an elastic member. The spring 11 is a coil spring, and the support shaft 4
It is installed by being inserted into.

The moving member 5 has an inclined surface 15 which is inclined in the axial direction of the photosensitive drum 222, that is, in the X-axis direction. The inclined surface 15 is formed by the photosensitive drum 22 of the moving member 5.
It is formed on the side toward 2, that is, on the lower part of the moving member 5.
In the present embodiment, the inclination directions of the inclined surfaces 15 provided on the first moving member 5a and the second moving member 5b are different. That is, in the first moving member 5a, the inclined surface 15 is formed so as to incline upward from one side of the support shaft 4 toward the other side, and in the second moving member 5b, from the other side of the support shaft 4. The inclined surface 15 is formed so as to incline upward as it goes to one side. By providing the inclined surface of the moving member 5 in this manner, the LED head 227 can be stabilized in the X-axis direction.

As shown in FIG. 6A, the first moving member 5a is formed with an inclined surface 15 so as to come into contact with the first contact member 7a at one point. In the second moving member 5b, as shown in FIG.
As shown in (b), the second contact member 5b has a recess 16 in the lower part so that it contacts the second contact member 7b at two or more points, and the inclined surface 15 is formed at the bottom of the recess 16. . In this embodiment, the recess 16 is formed in a groove shape extending in the X-axis direction. By thus providing the recessed portion 16 and contacting the contacting member 7, the contacting member 7 can be positioned by the inclined surface 15 formed at the bottom of the recessed portion 16 and the side surface of the recessed portion 16.

The frame member 6 is provided so as to cover the LED head 227. The frame member 6 has a first end portion on the first end side in the longitudinal direction.
Frame 20, second frame 21 on the other end side in the longitudinal direction,
And a third frame 23 between the first frame and the second frame. The first to third frames have an integrated structure in which a single metal plate material is bent. Both longitudinal ends of the frame member 6, that is, the first frame 2
0 and the second frame 21 are provided with through holes. The support shaft 4 is inserted into the through hole to support the frame member 6.
The frame member 6 is rotatably supported by the support shaft 4. A locking portion 25 with which the other end (lower end portion) of the contact member 7 in the Y-axis direction contacts is provided on the side of the frame member 6 facing the photoconductor drum 222, that is, on the lower portion of the frame member 6. The locking portion 25 is formed on the third frame 22. Also LED
The locking portion 25 at one end of the frame member 6 with which the first contact member 7a provided at one end of the head 227 abuts the first locking portion 2
5a, and the locking portion 25 at the other end of the frame member 6 that comes into contact with the second contact member 7b provided at the other end of the LED head 227 is referred to as the second locking portion 25b.

FIG. 7A shows the first locking portion 25a of the frame member 6.
7B is a partial bottom view of the frame member 6 of FIG.
It is a partial bottom view which shows the locking part 25b. As shown in FIGS. 7A and 7B, the first locking portion 25a and the second locking portion 25a
The shape of the locking portion 25b is different. The first locking portion 25a is Z
It is configured by a substantially U-shaped cut having a tip portion in the axial direction. By the first locking portion 25, the first contact member 7a
The lower end of the can be positioned in the Z-axis direction. Second
The locking portion 25b has a wedge shape (substantially V) having a tip in the Z-axis direction.
It is composed of notches. Second locking portion 25
By b, the lower end portion of the second contact member 7b can be positioned in the X-axis direction and the Z-axis direction. In the present embodiment, the locking portion 25 is formed by a notch in which the front side of the writing unit is opened, but it may be formed by a through hole or a recess having a notch.

A spring 8 is provided between the head support 2 and the frame member 6 to bias the LED head 227 diagonally upward. In this embodiment, a coil spring is used as the spring 8. Specifically, as shown in FIGS. 4 and 6, the spring 8 is provided over the head support portion 2 of the LED head 227 and the upper rear surface of the frame member 6, and
The D head 227 is urged to the upper rear surface of the frame member 6. Therefore, since the biasing force always acts on the LED head 227 toward the upper rear side, the contact member 7 is moved toward the moving member 5 and the frame member 6.
Is biased to the side. The spring 8 is the LED head 227.
Of the first abutting member 7a in the Y-axis direction from the first end (upper end) to the first
The other end portion (lower end portion) of the first contact member 7a of the LED head 227 in the Y-axis direction is urged in the Y-axis direction with respect to the moving member 5a.
The LED head 2 against the frame member 6 in the Z-axis direction.
The second abutting member 7b of the LED head 227 of the second abutting member 7b of the LED head 227 is biased in the Y-axis direction and the Z-axis direction with respect to the second moving member 5b. The other end portion (lower end portion) in the Y-axis direction can be biased in the X-axis direction and the Z-axis direction with respect to the frame member 6. Therefore, the LED
The head 227 can be positioned in all directions of the X axis direction, the Y axis direction, and the Z axis direction.

FIG. 8 is an enlarged sectional view showing a contact portion between the second moving member 5b and the second contact member 7b. As described above, the groove-shaped recess 16 is formed in the lower portion of the second moving member 5. The inclined surface 15 formed at the bottom of the recess 16 is
It has a surface inclined in two directions. The inclined surface 15 formed on the bottom of the recess 16 has a first inclined surface 15a inclined in the X-axis direction and not inclined in the Z-axis direction, and the first inclined surface 1 described above.
5a, a second inclined surface 15b that is inclined in the X-axis direction and further inclined in the Z-axis direction toward the photoconductor drum 222. The second contact member 7b is provided with the recess 16
When contacted with, the biasing force Fs1 of the spring 8 exerts component forces Fu and Fh in the Y-axis direction and the Z-axis direction. As a result, a space 18a is formed on the wall surface of the concave portion 16 and a space 18b is formed on the bottom portion of the concave portion 16, and the second inclined surface 16 of the concave portion 16 and the side surface 19 close to the spring 8 form a second portion. 2 The contact member 7b contacts. Therefore, the second contact member 7b is moved in the Y-axis direction and the Z-direction.
Positioning can be performed by reliably abutting in the axial direction. In this embodiment, the other end side of the frame member 6 on which the second moving member 5b is arranged serves as a reference side for positioning the LED head 227 with respect to the writing head adjusting device 3. On the other hand, in the contact portion between the first moving member 5a and the first contact member 7a, the positioning is performed only in the Y-axis direction, and the positioning is not performed in the Z-axis direction. As described above, on the side of the first moving member 5a, the position of the LED head 227 is not regulated in the Z-axis direction, but since the LED head 227 has sufficient rigidity, even if the LED head 227 is pulled obliquely upward by the spring S1, it does not move in the Z-axis direction. The contact member 7a does not tilt.

At the frame side of the copying machine 1 of the write head adjusting device 3, that is, at one end and the other end in the longitudinal direction of the write head adjusting device 3, a distance H between the LED head 227 and the photosensitive drum 222 is set. First adjusting means 9 for adjusting are respectively provided. The first adjusting means 9 includes a gap adjusting screw 30 and a screw hole 31 provided in the frame of the frame member 6.
Composed of. The screw hole 31 is provided at a position corresponding to the side surface of the moving member 5. The interval adjusting screw 30 is screwed into the screw hole 31 so that the tip end of the screw is brought into contact with the moving member 5. Since the moving member 5 is biased by the spring 11 toward the end portion in the longitudinal direction of the write head adjusting device 3, the moving member 5 is positioned in the X-axis direction by the biasing force of the spring 11 and the gap adjusting screw 30. It can be performed. The space adjusting screw 30 is provided on the copying machine 1 when the writing head adjusting device 3 is mounted on the frame of the copying machine 1.
It is configured to project outward from the side portion of the. Therefore, it is possible to easily rotate the gap adjusting screw 30 to move the moving member 5 only by leaving the exterior of the copying machine 1 open and removing the exterior.

When the moving member 5 is moved along the support shaft 4 by rotating the interval adjusting screw 30, that is, in the X-axis direction, the contact member 7 that contacts the inclined surface 15 of the moving member 5 is moved. , Guided by the inclined surface 15 to move in the Y-axis direction. When the contact member 7 moves in the Y-axis direction, the LED head 227 moves in the Y-axis direction. Therefore, the distance H between the LED head 227 and the photoconductor drum 222 can be adjusted.

Next, the adjusting operation of the distance H between the LED head 227 and the photosensitive drum 222 by the writing head adjusting device 3 will be described with reference to FIGS. 9, 10 and 11. Here, only the adjustment by the first adjusting means 9 at one end of the write head adjusting device 3 will be described.
The same applies to the first adjusting means 9 at the other end. Note that FIG.
In FIG. 11, the frame member 6, the spring 8 and the like are omitted in order to prevent the drawing from being complicated, and in FIG. 11, the gap adjusting screw 30, the support shaft 4, and the spring 11 are further omitted.

As shown in FIG. 9, the urging force Fo of the spring 11 acts on the first moving member 5a at the end of the support shaft 4 in the axial direction. The first contact member 7a is acted on by the force Fu acting upward in the Y-axis direction of the biasing force of the spring 8.

FIG. 10 relates to the first moving member 5a which moves when the distance adjusting screw 30 is moved back and forth in the X-axis direction.
FIG. 11 is a front view showing a state where the LED head 227 moves up and down in the Y-axis direction, and FIG. 11 is a front view schematically showing the operation. When the distance between the LED head 227 and the photoconductor drum 222 is H, by moving the interval adjusting screw 30 forward and backward, as shown in FIG.
The distance between the photosensitive drum 222 and the photosensitive drum 222 is shorter than H1.
Alternatively, it can be H2, which is longer than H.

More specifically with reference to FIG. 10, when the first moving member 5a is at the position Xa, the inclined surface 15 of the first moving member 5a and the first contact member 7a contact at the contact point a. However, the distance H between the LED head 227 and the photoconductor drum 222 at this time is Ha. When the first moving member 5a is moved from the position Xa to the position Xb inside the writing head adjusting device 3 from this state, the first moving member 5 is moved.
The contact point between a and the first contact member 7a moves downward in the Y-axis direction, and the first moving member 5a and the first contact member 7a contact at the contact point b. The contact point between the first moving member 5a and the first contact member 7a is downward in the Y-axis direction, that is, the photosensitive drum 222.
The distance H between the LED head 227 and the photosensitive drum 222 is shorter than Ha by moving in the direction toward
b. On the contrary, when the first moving member 5a is moved from the position Xa to the position Xc on the end side of the write head adjusting device 3, the contact point between the first moving member 5a and the first contact member 7a is in the Y-axis direction. It moves upward and the first moving member 5a and the first contact member 7a come into contact with each other at the contact point c. The contact point between the first moving member 5a and the first contact member 7a moves upward in the Y-axis direction, that is, in the direction away from the photoconductor drum 222, so that the LED head 227 and the photoconductor drum 222 are separated from each other. The distance H is Hb which is longer than Ha.

FIG. 12A is a front view showing an operation when the distance H between the LED head 227 and the photosensitive drum 222 is narrowed. When the distance H between the LED head 227 and the photosensitive drum 222 is narrowed, the gap adjusting screw 30 is inserted to oppose the biasing force Fo of the spring 8, that is, the inside of the writing head adjusting device 3 (FIG. 11).
The first moving member 5a is moved by X1 in the right direction of (a). With the movement of the first moving member 5a, the first contact member 7
a is a downward force in the Y-axis direction against the force Fu acting upward in the Y-axis direction of the biasing force of the spring 8, that is, the photosensitive drum 2
Move Y1 in the direction toward 22. This allows LE
The distance between the D head 227 and the photosensitive drum 222 is set to H
Can be made narrower than H1.

FIG. 12B is a front view showing the operation when the distance H between the LED head 227 and the photosensitive drum 222 is widened. When the distance H between the LED head 227 and the photosensitive drum 222 is widened, the gap adjusting screw 30 is retracted and the urging force Fo of the spring 8 acts, that is, the outside of the writing head adjusting device 3 (FIG. 11).
The first moving member 5a is moved by X2 in the left direction of (b). With the movement of the first moving member 5a, the first contact member 7
a is an upper part of the urging force of the spring 8 in the Y-axis direction in which a force Fu acting in the upper Y-axis direction acts, that is, the photosensitive drum 2
Move Y2 in the direction away from 22. By this, L
The distance between the ED head 227 and the photosensitive drum 222 can be set to H2 which is wider than H.

In this embodiment, the moving member 5 having the inclined surface 15 at the lower portion is brought into contact with the upper portion of the abutting member 7, but conversely, the abutting portion extending downward is provided at the moving member 5.
The inclined surface may be formed on the upper surface of the LED head support member 3 with which the tip of the contact portion abuts.
Accordingly, when the moving member 5 moves along the support shaft 4, the LED head 227 can be moved up and down in the Y-axis direction by the inclined surface provided on the upper portion of the LED head support member 3, and the LED head 227. The distance H between the photosensitive drum 222 and the photosensitive drum 222 can be adjusted.

By using the write head adjusting device 3 as described above, the LEs are applied from both sides of the LED head 227.
The distance H between the D head 227 and the photosensitive drum 222 can be adjusted. Therefore, the LED head 22
Even if the lower part of 7 is not opened, the position of the LED head 227 with respect to the photosensitive drum 222 can be easily adjusted from the side of the writing head adjusting device 3. Further, as the first adjusting means 9, the space adjusting screw 30
Since the rotation of the gap adjusting screw 30 is converted into the linear movement of the moving member 5 by using, the LED head 227
The distance H between the photosensitive drum 222 and the photosensitive drum 222, that is, L
The focus of the ED head can be precisely adjusted.

Further, by changing the inclination angle of the inclined surface 15 provided on the moving member 5, the interval adjusting screw 3
The adjustment rate, which is the amount of movement of the LED head 227 with respect to the amount of movement of 0, may be changed. By reducing the inclination angle of the inclined surface 15 with respect to the X-axis direction, it is possible to reduce the movement amount of the LED head 227 with respect to the movement amount of the adjustment screw 15, and thus it is possible to perform fine adjustment of the distance. Further, the inclined surface 15 provided on the moving member 5 may be a curved surface having a predetermined curvature.

Further, in the write head adjusting device 3, LE
The moving members 5 are provided on both of the abutting members 7 provided at both ends of the D head 227, and the moving members 5 are respectively provided with the first moving member 5.
Since the adjusting means 9 is provided, the distance from the photoconductor drum 222 can be individually adjusted at both ends of the LED head 227. Therefore, even if the axis of the photosensitive drum 222 is inclined, the position of the LED head 227 can be adjusted correspondingly.

Further, the moving member 5 is provided with a projecting piece 35 projecting toward the longitudinal end of the frame member 6. 13 is an enlarged front cross-sectional view showing the protruding piece 35 of the first moving member 5a, and FIG. 14 is a protruding piece 3 of the first moving member 5a.
It is a side view which expands and shows 5. An opening 36 is provided in the first frame 20 of the frame member 6 at a position corresponding to the end of the protruding piece 35. The opening 36 may be a hole in the frame member 6 or a notch. Accordingly, the position of the tip of the protruding piece 35 can be confirmed through the opening 36, and the LED head 227 can be confirmed by the positional relationship between the protruding piece 35 and the opening 35.
The distance H between the photosensitive drum 222 and the photosensitive drum 222 can be confirmed. 13 and 14, only the projecting piece 35 provided on the first moving member 5a at one end of the write head adjusting device 3 is shown, but the projecting piece provided at the second moving member 5b at the other end. The same applies to 35. Further, the frame of the copying machine 1 is provided with a confirmation window at a position where the position of the protruding piece 35 can be confirmed when the writing head adjusting device 3 is attached to the frame of the copying machine 1. Therefore, even when the writing head adjusting device 3 is mounted on the copying machine 1, the LED
The positional relationship between the head 227 and the photosensitive drum 222 can be confirmed.

FIG. 15 is a perspective view showing a writing unit attached to a frame of the copying machine 1 (hereinafter referred to as a main body frame). FIG. 16 shows a section line C of FIG.
It is the front sectional view seen from -C. FIG. 17 (a) is shown in FIG.
FIG. 17B is a cross-sectional view taken along section line D-D of FIG.
FIG. 17 is a cross-sectional view taken along the section line EE of FIG. 16. FIG. 18 is a plan view of the writing unit attached to the body frame as seen from the photosensitive drum 222 side. Figure 1
9A is a side view of the writing unit attached to the main body frame as seen from one side, and FIG.
[Fig. 6] is a side view of the writing unit attached to the main body frame as seen from the other side.

The second adjusting means 10 is provided at one end of the frame member 6. The second adjusting means 10 includes a support plate 40, a screw hole 41, and a scan tilt adjusting screw 42. The support plate 40 projects from the first frame 20 at one end of the frame member 6 in the longitudinal direction (X-axis direction) of the frame member 6. The support plate 40 is provided with a screw hole 41, and a scanning tilt adjusting screw 42 is screwed into the screw hole 41. In this embodiment, the support plate 4
0 is arranged at the upper end of the first frame 20. The support plate 40 may be configured integrally with the frame member 6. Second
The adjustment of the scanning inclination of the LED head 227 with respect to the photosensitive drum 222 by the adjusting means 10 will be described later.

A frame (hereinafter referred to as a first main body frame) 45 on one side of the copying machine 1 is provided with a notch 46 having the same outer shape as that of the support shaft 4 projecting in the longitudinal direction of the write head adjusting device 3. . One end of the support shaft 4 is provided with the notch 4
6 is contacted and positioned, and the frame member 6 is fixed to the first main body frame 45 by the first fixing screw 47. First
The fixing screw 47 is inserted into a hole 48 provided in the first frame 20 of the frame member 6 and screwed into a corresponding screw hole provided in the first main body frame 45. Hole 48 is first
When the fixing screw 47 is loosened, the frame member 6 becomes the first main body frame 4
It is provided so as to be movable with respect to 2, and has a substantially elliptical shape in the present embodiment.

A hole 51 through which a support shaft 4 projecting in the longitudinal direction of the write head adjusting device 3 is inserted into a frame (hereinafter referred to as a second main body frame) 50 on the other side of the copying machine 1.
Is provided. The other end of the support shaft 4 is inserted into the hole 51 for positioning, and the frame member 6 is fixed to the frame on the other side of the copying machine 1 with a fixing screw. In this embodiment, two of the second fixing screws 52 provided above the support shaft 4 and the third fixing screws 53 provided below the support shaft 4 are provided.
The other end of the frame member 6 is fixed to the second main body frame 50 at some point. Further, in the present embodiment, the first fixing screw 47 is
It is fixed at a position corresponding to the second fixing screw 52. Also,
The second main body frame 50 is provided with a frame opening 54 at a position where the projecting piece 35 projecting from the moving member 5 of the write head adjusting device 3 is provided. by this,
Even when the writing head adjusting device 3 is attached to the body frame of the copying machine 1, the position of the locking piece 35 can be confirmed from the side, and the distance H between the LED head 227 and the photoconductor drum 222 can be confirmed. Adjustment becomes easy.

As described above, the frame member 6 is mounted on the frame of the copying machine 1 with the support shaft 4 as a reference and is fixed by a plurality of fixing screws. By attaching the writing unit to the frame of the copier 1 as described above, the LED
When replacing the head 227, the fixing screw can be removed from the side of the copying machine 1 to easily remove the writing unit.

The first body frame 45 projects outward,
Frame protrusion 6 facing the support plate 40 of the frame member 6
Has 0. The frame protrusion 60 may be integrally formed with the first main body frame 45. A spring 61 that biases the frame member 6 in a predetermined direction is attached to the frame projecting portion 60. The spring 61 provided on the frame projecting portion 60 of the first main body frame 45 biases the tip of the scanning tilt adjusting screw 42 toward the frame projecting portion 60.

Here, L is performed by using the second adjusting means 10.
The adjustment of the scanning inclination of the ED head 227 with respect to the photosensitive drum 222 will be specifically described. 20 and 2
1A and 1B are a side view and a plan view showing the operation of the write head adjustment device 3 when adjusting the scanning inclination. First, with the other end of the frame member 6 fixed to the second body frame 50, the first fixing screw 47 fixing one end of the frame member 6 to the first body frame 45 is loosened. Here, when the scanning tilt adjusting screw 42 is rotated to enter in the direction toward the frame protrusion 60 (the direction of arrow F1 in FIGS. 20 and 21), the scanning tilt adjusting screw 42 is blocked by the frame protrusion 60. The upper end portion 70 of the frame member 6 is acted in the direction away from the frame protrusion 60 (the direction of arrow F2 in FIGS. 20 and 21). Since the frame member 6 is rotatably supported by the support shaft 4, the frame member 6 is twisted and rotated about the support shaft 4, and a rotational force acts on the lower end portion 71 of the frame member 6 in the direction of arrow F3 in FIG. To do. As a result, the frame member 6 is twisted around the support shaft 4.

When the frame member 6 is twisted and rotated, the LED head 227 held inside the frame member 6 swings and rotates with the second contact member 7b side as the reference side. As a result, the longitudinal direction of the LED head 227 can be made parallel to the axial direction of the photosensitive drum 222 within a cylindrical surface centered on the axial line of the photosensitive drum 222. Further, FIG. 22 is a cross-sectional view showing the operation of the writing unit when the adjustment is performed. The solid line shown in FIG. 22 shows the state of the writing unit before adjustment, and the broken line shows the state of the writing unit after adjustment. In the write head adjusting device 3,
Since the inclined surface 15 of the first moving member 5a with which the upper end of the first contact member 7a of the LED head 227 in the Y-axis direction contacts has a flat shape without a recess, when the frame member 6 is twisted and rotated. As shown in FIG. 22, the first contact member 7a can slide on the inclined surface 15. Further, as described above, the lower end portion of the first contact member 7a is positioned only in the Z-axis direction. Therefore, the LED head 227
It is possible to dissipate the force that gives distortion to the LED head 227 and prevent the LED head 227 from being broken or deformed even when the frame member 6 is twisted and rotated. 20 and 21, the case where the scanning tilt adjusting screw 42 is inserted in the arrow F1 direction has been described, but when it is moved in the direction opposite to the arrow F1 direction, the frame member 6 is twisted in the opposite direction. You can By twisting and rotating the frame member 6 around the support shaft 4 as described above, the second adjusting means 10 causes the LEDs to be formed in a cylindrical plane centered on the axis of the photosensitive drum 222.
The longitudinal direction of the head 227 can be made parallel to the axial direction of the photoconductor drum 222, and the scanning tilt of the LED head 227 with respect to the photoconductor drum 222 can be adjusted.

Photosensitive drum 222 of LED head 227
The adjustment of the scanning inclination with respect to can be performed from one side of the copying machine 1. In addition, since the scanning tilt adjusting screw 42 is used to rotate the scanning tilt adjusting screw 42 to linearly move the frame member 6, the scanning tilt of the LED head 227 with respect to the photosensitive drum 222 is precisely adjusted. Can be done.

Further, in this embodiment, the scanning tilt adjusting screw 4 is used.
2 is adjusted by using the eccentric member.
May be configured to rotate around the support shaft 4.

The scanning tilt adjusting screw 42 is used to set LE
After adjusting the scanning inclination of the D head 227 with respect to the photosensitive drum 222, one end of the frame member 6 is fixed to the frame on one side of the copying machine 1 with a fixing screw. At this time,
In addition to the fixing screws, fixing means for fixing the frame member 6 to the frame on one side of the copying machine 1 may be further provided.

As described above, the writing head adjusting device 3 can adjust the distance H between the LED head 227 and the photosensitive drum 222, and the LED head 2 can be adjusted.
The scanning inclination of 27 with respect to the photosensitive drum 222 can be adjusted. Further, the distance H between the LED head 227 and the photosensitive drum 222 can be individually adjusted at both ends of the LED head 227. Photoconductor drum 222
The position of the LED head 227 with respect to can be precisely adjusted.

Referring to FIG. 1 again, another configuration of the copying machine 1 will be described. The double-sided automatic document feeder 112 first conveys the document so that one surface of the document faces the image reading unit 110 at a predetermined position of the document table 111, and after the image reading on this one surface is completed, The original is inverted and conveyed toward the original placing table 111 so that the other surface of the original faces the image reading unit 110 at a predetermined position of the original table 111. Then, the double-sided automatic document feeder 112 discharges this document after the reading of the images on both sides of one document is completed, and carries out the conveying operation for the next document. The above-described document feeding and reversing operations are controlled by the control unit 200 in relation to the operation of the entire copying machine 1. Further, each unit of the copying machine 1 has a control unit 20.
Controlled by 0.

The document reading section 110 is arranged below the document table 111, and the document placed on the document table 111 or the document table 111 by the double-sided automatic document feeder 112 is used.
Read the image of the original that has been conveyed above. The image reading unit 110 includes document scanning bodies 113 and 114 that reciprocate in parallel along the lower surface of the document table 111, and the optical lens 11.
5 and a CCD (Charge Coupled Dev) which is a photoelectric conversion element.
ice) line sensor.

The original scanning bodies 113 and 114 are composed of a first scanning unit 113 and a second scanning unit 114. The first scanning unit 113 has an exposure lamp that exposes the surface of the document, and a first mirror that deflects the reflected light image from the document in a predetermined direction.
It reciprocates in parallel at a predetermined scanning speed while maintaining a constant distance from the lower surface of the. The second scanning unit 114 is
The first scanning unit 113 has a second mirror and a third mirror that further deflects the reflected light image from the document deflected by the first mirror of the first scanning unit 113 in a predetermined direction. It moves back and forth in parallel while maintaining the speed relationship.

The optical lens 115 reduces the reflected light image from the document deflected by the third mirror of the second scanning unit 114, and the reduced optical image CCD line sensor 116.
An image is formed at a predetermined position above.

The CCD line sensor 116 sequentially photoelectrically converts the formed optical image and outputs it as an electric signal. CC
The D line sensor 116 is a three-line color CCD capable of reading a monochrome image or a color image and outputting line data decomposed into R (red), G (green), and B (blue) color components. The document image information converted into an electric signal by the CCD line sensor 116 is further transferred to an image processing unit (not shown) and subjected to predetermined image data processing.

Next, the structure of the image forming unit 210 and the structure of each unit related to the image forming apparatus 210 will be described.

Below the image forming unit 210, the paper feed mechanism 21 for separating the recording papers 100 stacked and accommodated in the paper tray one by one and feeding them toward the image forming unit 210.
1 is provided. The recording papers 100 separated one by one by the paper feeding mechanism 211 are conveyed to the image forming unit 210 at a timing controlled by a pair of registration rollers 212 provided in front of the image forming unit 210.

A transfer / conveying belt mechanism 213 is arranged below the image forming section 210. The transfer / conveying belt mechanism 213 stretches the transfer / conveying belt 216 between the driving roller 214 and the driven roller 215 so as to extend substantially in parallel, and electrostatically adsorbs the recording paper 100 to the transfer / conveying belt 216 to convey it. .

Transfer Conveying Belt Mechanism 2 in Paper Conveying Path
On the downstream side of 13, a fixing device 2 for fixing the toner image transferred and formed on the recording paper 100 onto the recording paper 100.
17 are arranged. The recording paper 100, which has passed through the nip portion between the pair of fixing rollers included in the fixing device 217, passes through the conveyance direction switching gate 218 and then the discharge roller 219.
Is discharged onto a discharge tray 220 attached to the outer wall of the main body of the copying machine 1.

The transport direction switching gate 218 selectively selects a transport route for the recording paper 100 after the toner image is fixed, a route for discharging from the main body of the copying machine 1 and a route for re-supplying to the image forming section 210. Switch. Switching gate 21
The recording paper 100 conveyed again toward the image forming unit 210 by 8 is turned upside down by the switchback conveyance path 221, and then the timing is controlled by the registration rollers 212 to be supplied again to the image forming apparatus 210. .

At the upper part of the image forming section 210, the first image forming station Pa,
The second image forming station Pb, the third image forming station Pc, and the fourth image forming station Pd are arranged in parallel in order from the upstream side of the recording paper 100 conveyance path.

The transfer / transport belt 216 is connected to the driving roller 21.
4 is frictionally driven in the direction of arrow Z in FIG. 1 and is fed by the paper feed mechanism 211 as described above.
00, and the first to fourth image forming stations Pa
To Pb in sequence.

The respective image forming stations have substantially the same structure, that is, the structure shown in FIG. LED head 2
An image signal corresponding to the black component image of the color image is input to 27a, and an image signal corresponding to the cyan component image of the color image is input to LED head 227b.
An image signal corresponding to the magenta component image of the color image is input to the head 227c, and an image signal corresponding to the yellow component image of the color image is input to the LED head 227d.

As a result, the electrostatic latent images corresponding to the color-converted original image information are converted into the respective photosensitive drums 222a to 222.
formed on d. The developing device 224a contains black toner, the developing device 224b contains cyan toner, the developing device 224c contains magenta toner, and the developing device 224d ends yellow toner. The electrostatic latent images formed on the photoconductor drums 222a to 222d are developed by the toners of the respective colors. As a result, the color-converted original image information is reproduced as a toner image of each color.

Further, a sheet adsorption charger 228 is provided between the first image forming station Pa and the sheet feeding mechanism. The paper suction charger 228 is a brush charger,
The surface of the transfer / transport belt 216 is charged. As a result, the recording paper 100 supplied from the paper supply mechanism 211 is conveyed between the first image forming station Pa and the fourth image forming station Pd while being surely adsorbed on the transfer conveying belt 216. You can

On the other hand, between the fourth image forming station Pd and the fixing device 217, a slowing device 229 is provided above the driving roller 214. An alternating current is applied to the grading device 229, and the recording paper 100 attracted to the transfer / transport belt 216 is separated from the transfer / transport belt 216.

In the copying machine 1 having the above structure, the recording paper 10
As 0, a cut sheet recording paper 100 is used.
When the recording paper 100 is sent out from the paper feed tray and supplied into the guide of the paper feed transport path of the paper feed mechanism 211, the front end portion of the recording paper 100 is detected by a sensor (not shown). 1 based on the output detection signal
It is once stopped by the pair of registration rollers 212.

Then, the recording paper 100 is timed with the first to fourth image forming stations Pa to Pd in FIG.
Is fed onto the transfer / conveying belt 216 rotating in the Z direction. At this time, since the transfer / conveying belt 216 is charged by the attraction charger 228 as described above, the recording paper 100 is stable while passing through the first to fourth image forming stations Pa to Pb. And then transported.

First to Fourth Image Forming Stations Pa
At Pd, the toner images of the respective colors are superposed on the recording paper 100 that is electrostatically attracted and conveyed by the transfer and conveyance belt 216. When the transfer of the toner image onto the recording paper 100 by the fourth image forming station Pd is completed, the recording paper 100
Is sequentially peeled off from the transfer conveyor belt 216 by the static eliminator 229 from the tip portion thereof, and is guided to the fixing device 217. Finally, the recording paper 100 having the toner image fixed by the fixing device 217 is discharged onto the paper discharge tray 220 from a paper discharge port (not shown).

As described above, in the digital color copying machine 1 of the present invention, the LED head 227 and the photosensitive drum 222 are used.
The distance H between and can be adjusted from the side of the frame of the copier 1, and the scanning tilt of the LED head 227 with respect to the photosensitive drum 222 can be adjusted from the side of the frame of the copier. Therefore, the photosensitive drum 222 of the LED head 227 can be simply opened by opening the exterior of the main body device.
The position with respect to can be adjusted.

Although the LED head 227 is used as the writing head in the above-described embodiment, a writing head using a solid state light emitting element such as a phosphor light emitting element (FL) or electroluminescence (EL), a shutter for liquid crystal, etc. You may use the write head using.

In addition to the copying machine 1, the present invention can be suitably applied to an image forming apparatus such as a printer and a facsimile.

[0105]

As described above, according to the present invention, the distance between the writing head and the photosensitive drum can be adjusted from the side portion of the main body device by the adjusting means. Therefore, the distance between the writing head and the photoconductor drum can be adjusted by simply opening the exterior of the main body device without disassembling the internal parts of the main body device.

Further, according to the present invention, the scanning inclination of the writing head with respect to the photosensitive drum can be adjusted from the side portion of the main body device by the adjusting means. Therefore, the scanning tilt of the writing head with respect to the photosensitive drum can be adjusted by simply opening the exterior of the main body device without disassembling the internal parts of the main body device.

Further, according to the present invention, since at least one of the moving member and the abutting member has an inclined surface inclined in the axial direction of the photosensitive drum, the moving member in the axial direction of the photosensitive drum is moved. As a result, the contact member can be moved in a direction perpendicular to the axial direction of the photosensitive drum, and the distance between the writing head and the photosensitive drum can be adjusted.

Further, according to the present invention, since the moving member is provided for both the abutting members provided at both ends of the writing head, the writing head and the photosensitive drum are arranged along the axial direction of the photosensitive drum. The distance between them can be adjusted with high accuracy and easily.

According to the present invention, the positional relationship between the writing head and the photosensitive drum can be confirmed by the positional relationship between the opening provided in the frame member and the projecting piece provided in the moving member. The distance between the head and the photosensitive drum can be easily adjusted.

Further, according to the present invention, one end of the write head is positioned in the Y-axis direction and the Z-axis direction, and the other end is X-axis.
By positioning in the axial direction, the Y-axis direction and the Z-axis direction, the write head can be positioned in all the directions of the X-axis direction, the Y-axis direction and the Z-axis direction. Also,
The twisting of the writing head can be prevented when the frame member is twisted and rotated about the support shaft, so that the writing head is not broken or deformed.

Further, according to the present invention, the moving member has a recess with which one end of the second contact member in the Y-axis direction abuts. The bottom of the recess is formed as an inclined surface that is inclined in the X-axis direction, and the resilient member urges the bottom of the recess and the side surface of the recess to contact the second contact member.
Axial and Z-axis positioning can be performed.

Further, according to the present invention, the frame member has a locking portion with which the other end of the second contact member in the Y-axis direction abuts. A wedge-shaped notch having a tip in the Z-axis direction is formed in the locking portion. By urging the elastic member so that the first contact member comes into contact with the two places on the bottom of the notch, it is possible to perform positioning in the X-axis direction and the Z-axis direction by the urging force in one direction.

Further, according to the present invention, since the second inclined surface which is inclined in the direction toward the photosensitive drum in the Z-axis direction is formed at the bottom of the recess, the first abutting member in the Y-axis direction. The one end can be surely brought into contact with the bottom and side surfaces of the recess.

Further, according to the present invention, since the frame member has lower rigidity than the writing head, the frame member is twisted and rotated,
By moving the contact member of the writing head supported by the frame member, the scanning inclination of the writing head with respect to the photosensitive drum can be adjusted. Further, it is possible to prevent the writing head from being twisted and deformed when the frame member is twisted and deformed.

Further, according to the present invention, an electrostatic latent image can be formed on the cylindrical photosensitive drum rotatably supported between the frames by the write head held by the write head adjusting device. . A high-quality image can be formed by developing the electrostatic latent image formed on the photosensitive drum with toner and transferring it to the recording member. Further, since the position of the writing head can be adjusted from the side portion of the main body device, it is possible to perform the adjustment work while executing the test printing.

According to the present invention, the write head adjusting device is detachably attached to the frame of the main body device as one unit together with the write head. Therefore, when replacing the write head, the write head adjusting device and the frame of the main body device are replaced. It can be removed and replaced. Further, the frame is provided with a notch on one side and a hole is provided on the other side, and the unit is positioned on the frame by these, so that the write head is reliably positioned with respect to the photosensitive drum. be able to.

Further, according to the present invention, one side of the support shaft is brought into contact with the notch provided on the one side portion of the frame, and the other side of the support shaft is inserted into the hole provided on the other side of the frame. The writing head can be reliably positioned with respect to the photosensitive drum.

According to the invention, one end of the frame member of the write head adjusting device is rotatably provided with respect to one side part of the frame, and the other end part of the frame member is provided with respect to the other side part of the frame. Fixed. The adjusting means is arranged at one end of the frame member, and by twisting and rotating the frame member around the support shaft, the scanning inclination of the writing head held by the frame member with respect to the photosensitive drum can be adjusted.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing the configuration of a digital color copying machine 1 which is an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a configuration of an image forming station P of an image forming section 210.

FIG. 3 shows an LED head 227 and this LED head 227.
FIG. 6 is a perspective view of a writing unit configured by a writing head adjusting device 3 that holds the.

FIG. 4 is a front sectional view of a writing unit.

5A is an enlarged front sectional view showing one end of the writing unit, and FIG. 5B is an enlarged front sectional view showing the other end of the writing unit.

6A is a sectional view taken along section line AA of FIG. 4, and FIG. 6B is a sectional view taken along section line BB of FIG.

7A is a partial bottom view showing the first locking portion 25a of the frame member 6, and FIG. 7B is the second locking portion 25b of the frame member 6.
FIG.

FIG. 8 is an enlarged sectional view showing a contact portion between a second moving member 5b and a second contact member 7b.

FIG. 9 is a front view showing forces acting on a first moving member 5a and a first contact member 7a.

FIG. 10 is a front view showing a state in which the LED head 227 moves up and down in the Y-axis direction in relation to the first moving member 5a that moves when the space adjusting screw 30 is moved back and forth in the X-axis direction. It is a front view which shows the operation typically.

FIG. 11 is a front view schematically showing the LED head 227 moving up and down in the Y-axis direction in relation to the first moving member 5a that moves when the space adjusting screw 30 is moved back and forth in the X-axis direction.

12A is a front view showing the operation when the distance H between the LED head 227 and the photoconductor drum 222 is narrowed, and the distance H between the LED head 227 and the photoconductor drum 222 is shown in FIG. It is a front view which shows operation | movement in the case of making it wide.

FIG. 13 is a front sectional view showing, in an enlarged manner, a protruding piece 35 of the first moving member 5a.

FIG. 14 is an enlarged side view showing a projecting piece 35 of the first moving member 5a.

15 is a perspective view showing a writing unit attached to the frame of the copying machine 1. FIG.

16 is a front cross-sectional view taken along the section line C-C of FIG.

17A is a sectional view taken along the section line DD of FIG. 16, and FIG. 17B is a sectional view taken along the section line EE of FIG.

FIG. 18 is a plan view of the writing unit attached to the main body frame as seen from the photosensitive drum 222 side.

FIG. 19 (a) is a side view of the writing unit attached to the main body frame as seen from one side, and FIG.
[Fig. 6] is a side view of the writing unit attached to the main body frame as seen from the other side.

FIG. 20 is a side view showing the operation of the write head adjustment device 3 when adjusting the scan inclination.

FIG. 21 is a plan view showing the operation of the write head adjustment device 3 when adjusting the scan tilt.

FIG. 22 is a sectional view showing the operation of the write head adjustment device 3 when the frame member 6 is twisted and rotated.

[Explanation of symbols]

1 Digital color copier 2 head support member 3 Write head adjustment device 4 Support shaft 5 Moving member 6 frame members 7 Abutment member 8 springs 9 First adjusting means 10 Second adjusting means 15 inclined surface 15a Second inclined surface 16 recess 25 Locking part 30 interval adjustment screw 31, 41 screw holes 35 protruding piece 36 openings 40 support plate 42 Scan tilt adjustment screw 45 First body frame 46 notches 50 Second body frame 51 holes 222 photoconductor drum 227 LED head

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 1/036 (72) Inventor Koichi Yamauchi 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Prefecture (72) Inventor Mitsuyoshi Terada, 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Prefecture, Sharp Corporation (72) Norio Tomita 22-22, Nagaike-cho, Abeno-ku, Osaka City, Osaka Prefecture (72) Invention Person Komura Nakamura 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Prefecture F-terms within Sharp Corporation (reference) 2C064 CC02 CC05 CC13 DD02 DD14 2C162 AE12 AE21 AE28 AE47 AE55 AE57 FA04 FA17 FA45 FA50 FA67 FA68 2H076 AB42 AB51 AB1 EA24 5C05 CA08 DA03 DB02 DB29 DB35 DE21

Claims (15)

[Claims] 1. A writing head adjusting device for adjusting the position of a writing head arranged to face a cylindrical photosensitive drum that is rotatably supported between frames of a main body device. A moving member that moves in parallel; an abutting member that is provided at both ends of the writing head and that abuts on the moving member; an elastic member that urges the abutting member toward the moving member; A writing head adjusting device, comprising: an adjusting unit provided on the frame side for adjusting the distance between the writing head and the photosensitive drum by moving the moving member. 2. A writing head adjusting device for adjusting the position of a writing head arranged to face a cylindrical photosensitive drum rotatably supported between frames of a main body device, wherein the writing head adjusting device is substantially parallel to the photosensitive drum. A support shaft arranged, a frame member that holds the write head and is supported by the support shaft, and a frame member that is provided on the frame side of the main body device and is twisted and rotated about the support shaft to form a frame. An adjusting device for adjusting the scanning inclination of the writing head held by the member with respect to the photosensitive drum. 3. A writing head adjusting device for adjusting the position of a writing head arranged to face a cylindrical photosensitive drum rotatably supported between frames of a main body device, wherein the writing head adjusting device is substantially parallel to the photosensitive drum. A support shaft arranged, a moving member that moves along the support shaft and moves substantially parallel to the axis of the photosensitive drum, and a frame member supported by the support shaft and provided at both ends of the writing head, An abutting member that abuts the moving member and the frame member, an elastic member that urges the abutting member toward the moving member side and the frame member side, and a moving member that is provided on the frame side of the main body device and that includes the moving member. First adjusting means for moving the write head to adjust the distance between the write head and the photosensitive drum; and a photosensitive drum of the write head held by the frame member by twisting and rotating the frame member about the support shaft. And a second adjusting means for adjusting a scanning inclination with respect to the writing head adjusting apparatus. 4. At least one of the moving member and the abutting member has an inclined surface that is inclined in the axial direction of the photosensitive drum, and the abutting member is guided by the inclined surface to move to write head. 4. The writing head adjusting device according to claim 1, wherein the distance between the photosensitive drum and the photosensitive drum is adjusted. 5. The write head according to claim 1, wherein the moving member is provided for both abutting members provided at both ends of the write head. Adjustment device. 6. The moving member includes a protruding piece protruding toward the frame side of the main body device, and the frame member confirms the positional relationship between the writing head and the photosensitive drum by the positional relationship with the protruding piece. 4. The write head adjusting device according to claim 3, further comprising: 7. An X-axis direction is defined as an axial direction of the photosensitive drum, and a Y-axis direction is a direction perpendicular to the X-axis direction and extending from the axial line of the photosensitive drum toward the moving member. When the direction perpendicular to the Z axis direction is set to the Z axis direction, the elastic member attaches one end portion of the first contact member provided at one end portion of the write head in the Y axis direction to the moving member in the Y axis direction. The other end of the Y-axis in the Z-axis direction against the frame member, and one end of the second contact member provided in the other end of the write head in the Y-axis direction is moved relative to the moving member. The write head is positioned by urging in the axial direction and the Z-axis direction and urging the other end in the Y-axis direction against the frame member in the X-axis direction and the Z-axis direction. 3. The write head adjusting device according to item 3. 8. The moving member has a recess with which one end of the second contact member in the Y-axis direction contacts, and the bottom of the recess is an inclined surface inclined in the X-axis direction. The write member Y is urged by urging the elastic member so as to contact the contact member.
8. The write head adjusting device according to claim 7, wherein positioning is performed in the axial direction and the Z axis direction. 9. The frame member has an engaging portion with which the other end of the second contact member in the Y-axis direction is engaged, and the engaging portion has a wedge-shaped notch having a tip in the Z-axis direction. Is formed, and the writing head is positioned in the X-axis direction and the Z-axis direction by urging the elastic member so that the first contact member comes into contact with the cut bottom portion at two positions. The write head adjusting device according to claim 7. 10. The bottom surface of the recess is formed with a second inclined surface that is inclined in the Z-axis direction, and the recess has a wedge-shaped cross-section perpendicular to the X-axis. Write head adjusting device as described. 11. The write head adjustment device according to claim 2, wherein the frame member has a rigidity lower than that of the write head. 12. A write head adjusting device according to claim 1, wherein the write head adjusting device holds a cylindrical photosensitive drum rotatably supported between frames. An image forming apparatus characterized in that an electrostatic latent image is formed by a writing head, the formed electrostatic latent image is developed by toner, and the developed image is transferred to a recording member to obtain an image formed product. 13. The write head adjusting device is configured to be attachable to and detachable from the frame as one unit together with the write head, and the positioning of the unit with respect to the frame is performed by a notch provided on one side of the frame and the other. 13. The image forming apparatus according to claim 12, wherein the image forming apparatus is formed by using holes provided on a side portion. 14. A write head adjusting device according to claim 2, wherein a cylindrical photosensitive drum rotatably supported between frames is provided with an electrostatic latent image by a write head held by the write head adjusting device. An image forming apparatus that forms an image, develops the formed electrostatic latent image with toner, and transfers the developed image to a recording member to obtain an image-formed product. One unit is detachably attached to the frame, and the positioning of the unit with respect to the frame is performed by abutting one side of the support shaft with a notch provided in one side portion of the frame, and a hole provided in the other side portion. An image forming apparatus characterized in that the unit is positioned by inserting the other side of the support shaft. 15. An electrostatic latent image is provided on a cylindrical photosensitive drum, which comprises the write head adjusting device according to claim 2 or 3 and is rotatably supported between frames, by a write head held by the write head adjusting device. An image forming apparatus for forming an image, developing the formed electrostatic latent image with toner, and transferring the developed image to a recording member to obtain an image-formed product, wherein an adjusting unit is arranged at one end of a frame member. One end of the frame member is rotatably supported on one side of the frame about the support shaft, and the other end of the frame member is fixed on the other side of the frame. An image forming apparatus, wherein the scanning inclination of a writing head held by a frame member with respect to a photosensitive drum is adjusted by twisting and rotating one end of the frame member.