JPS6333131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to an electrostatic copying apparatus equipped with a so-called moving optical system for projecting an image of an original to be copied onto the surface of a photosensitive member.

<Prior Art> As is well known to those skilled in the art, electrostatic copying apparatuses equipped with so-called moving optical systems are widely used in practice. The optical system includes a scanning section that includes first and second support frames that are reciprocatably mounted on the suspension rod, and a first reflecting mirror that is mounted on the first support frame. , a second reflective mirror attached to the second support frame; A configuration that includes a reciprocating mechanism including a pulley and a wire for reciprocating the second support frame is advantageously used.

<Problems of the Prior Art> The conventional optical system of the above type in an electrostatic copying apparatus has the following problems to be solved. That is, in the optical system of the above form, when performing wire wrapping in the reciprocating mechanism (more specifically, an operation of wrapping the wire around multiple pulleys as required and fixing a specific part of the wire at a required position), In particular, it is important to position the first reflecting mirror attached to the first support frame and the second reflecting mirror attached to the second support frame in a predetermined spaced relationship. However, as described above, since the first support frame and the second support frame have different moving speeds, the first support frame and the second support frame move at different speeds depending on the position of the first support frame (or the second support frame). 2 (therefore, the relative separation relationship with the support frame 1)
(relative positional relationship between the second reflecting mirror and the second reflecting mirror) changes. Therefore, in conventional optical systems,
First, the first support frame (or the second support frame) is positioned at a specific position, and then the second support frame (or the first support frame) is positioned at a specific position.
The operation of positioning a first support frame (or a second support frame) at a predetermined distance from a first support frame (or a second support frame) positioned at a specific position was performed using a plurality of spacing gauges. . Such positioning in conventional optical systems is quite complicated, and errors often occur.

<Problems to be solved by the invention> The present invention has been made in view of the above facts, and its technical problem is to improve the optical system of the above form in an electrostatic copying apparatus so that the first support frame can be fixed when hanging a wire. and the second support frame, and thus the first reflecting mirror and the second reflecting mirror, can be quickly and easily set in a predetermined spaced relationship.

<Solution Means of the Invention> The solution means of the present invention for achieving the above technical problem is that each of the first and second support frames is provided with a block portion set to a predetermined size, and The second support frame is moved beyond the reciprocating range of copy scanning, and the block portion of the second support frame is brought into contact with the stationary member present at one end of the suspension rod, and the first support frame is brought into contact with the stationary member present at one end of the suspension rod. When the block portion of the frame is brought into contact with the block portion of the second support frame, the first reflecting mirror and the second reflecting mirror are brought into contact with each other.
and the reflecting mirror are set at a predetermined distance from each other so that the reciprocating mechanism can perform wire hooking.

That is, according to the present invention, an optical system for projecting an image of a document to be copied onto the surface of a photosensitive member is provided;
The scanning section of the optical system includes first and second support frames reciprocably mounted on the suspension rod, and the first and second support frames.
a first reflecting mirror mounted on a support frame;
a second reflecting mirror mounted on the support frame;
a reciprocating mechanism including a slide and a wire for reciprocating the first support frame and the second support frame so that the speed of movement of the support frame is half the speed of movement of the first support frame; In an electrostatic copying apparatus, each of the first and second support frames is provided with a block portion set to a predetermined size, and the first and second support frames are configured to scan the first and second support frames for copying. The block portion of the second support frame is brought into contact with the stationary member present at one end of the suspension rod, and the block portion of the first support frame is moved beyond the reciprocating range of the suspension rod. When brought into contact with the block portion of the second support frame, the first reflecting mirror and the second reflecting mirror are set in a predetermined spaced relationship,
There is provided an electrostatic copying apparatus, characterized in that it is configured to be able to perform wire hooking in the reciprocating mechanism.

<Function> In the electrostatic copying apparatus of the present invention, the first and second support frames are moved beyond the reciprocating range of copy scanning, and the block portion of the second support frame is brought into contact with a stationary member. At the same time, as long as the block portion of the first support frame is brought into contact with the block portion of the second support frame, the first reflecting mirror and the second reflecting mirror are set in a predetermined spaced relationship. Therefore, the first reflecting mirror and the second reflecting mirror can be quickly and easily set in a predetermined spaced relationship when the wire is attached to the reciprocating mechanism.

<Specific Example> Reference will now be made to the accompanying drawings illustrating a specific example of an electrostatographic reproduction apparatus improved in accordance with the present invention.
This will be explained in more detail.

Referring to FIG. 1, the illustrated electrostatographic reproduction apparatus has a generally rectangular housing generally designated by the numeral 100. On the upper surface of the housing 100, there is a transparent plate 10 on which a document to be copied is placed.
2. A flexible original holding plate 104 is provided to cover the original placed on the transparent plate 102.

At the center of the lower half of the housing 100, a rotating drum 108 having a photosensitive member 2 mounted on its surface is arranged. Around the rotating drum 108, which is rotationally driven in the direction of arrow B, there are
A charging corona discharger 20, a developing device 6, a transfer corona discharger 36, a static elimination lamp 32, and a cleaning device 34 are arranged. Also, rotating drum 1
08, that is, in the upper half of the housing 100, an image of the original placed on the transparent plate 102 is displayed.
An optical system 22 for projecting light onto the surface of the rotating drum 108 is arranged in an exposure area between the charging corona discharger 20 and the developing device 6. Further, below the rotating drum 108, and therefore at the lower part of the housing 100, there is a paper feed cassette 110a attached to one side of the housing 100 (the right side in FIG. 1).
Alternatively, the transfer paper housed in 110b is transferred to a receiving tray attached to the other side of the housing 100 (the left side in FIG. 1) via the transfer area where the transfer corona discharger 36 is arranged. A conveyance system 112 for conveying up to 30 is arranged. Transport system 11
A fixing device 28 including a pair of cooperating pressure rollers 114a and 114b is disposed between the transfer area 2 and the tray 30.

A front vertical board (not shown) and a rear vertical board 103 (see FIG. 3) are disposed inside the housing 100 and extend from one side to the other side of the housing 100. The space between both substrates extends from one side of the substrate 100 to the other side, and includes an upper half where the optical system 22 is arranged, a rotating drum 108, and the various types described above arranged around the rotating drum 108. A partition plate 116 is attached that partitions the lower half portion into which the device and the transfer paper conveyance system 112 are arranged. This partition plate 116
An opening 118 is formed in the opening 118 through which the light beam irradiated onto the surface of the rotating drum 108 by the optical system 22 passes, as will be explained later. In addition, the partition plate 11
6, a lower end of an upright transparent plate 120 through which the above-mentioned light beam can pass is connected to a position a predetermined distance to the left from the opening 118 in FIG. If the upright transparent plate 120 does not have the same refractive index as the transparent plate 102 on which the document is placed, the image projected onto the surface of the rotating drum 108 will be out of focus. It is preferable that the transparent plate 102 is made of the same material and has the same thickness. The upper end of this upright transparent plate 120 is connected to a partition plate 122 extending to the right side of the housing 100. The partition plate 122 has an opening 124 in its right half extending substantially horizontally. Furthermore, the partition plate 116 and the partition plate 122
There is an opening 1 formed in the partition plate 116 between
A partition plate 126 is removably attached to prevent communication between the opening 124 formed in the partition plate 122 and the partition plate 18 .

As described above, the space between the front vertical board and the rear vertical board 103 is divided into an upper half and a lower half by the partition plate 116, and the space between the front vertical board and the rear vertical board 103 is divided into an upper half and a lower half. The parts include the partition plate 116, the upright transparent plate 120, the partition plate 122, and the partition plate 12.
It will be clear that by the cooperation of 6, they are separated in a non-communicating manner, ie, sealed partitions.

The optical system 22 is disposed in the upper half of the space between the front vertical substrate and the rear vertical substrate 103, and an original illumination lamp 128 of the optical system 22 (this lamp 128 is connected to the housing as will be described in detail later). 10
A suction device 130 is disposed that constitutes a cooling system for cooling the air (reciprocated in a substantially horizontal direction). The suction device 130 located near the left end of the upper half is connected to the housing 10 as indicated by the arrow.
Air is sucked in from a suction opening 132 formed in the left side wall of 0. The airflow sucked by the suction device 130 is passed through an opening 136 formed in the partition plate 134.
The liquid then passes to the right of the upper half, passes through the opening 124 in the partition plate 122, and is further discharged from the housing 100 through the discharge opening 138 formed in the right side wall of the housing 100. This air flow effectively cools the document illumination lamp 128.

Next, referring to FIGS. 1 to 3, the optical system 2
2 will be explained in detail.

The optical system 22 includes the document illumination lamp 128 described above.
, a first reflecting mirror 140 , and a second reflecting mirror 142
, an in-mirror lens 144 , and a third reflecting mirror 1
46. The document illumination lamp 128 and the first reflector 140 are connected to a pair of suspension rods 148a, 148b extending substantially horizontally within the upper half of the space between the front vertical substrate and the rear vertical substrate 103.
The first support frame 150 is slidably attached to the first support frame 150. The second reflector 142 is attached to a second support frame 152 that is slidably attached to the pair of suspension rods 148a, 148b. The in-mirror lens 144 is attached at a predetermined position between the partition plates 116 and 134 described above. The third reflecting mirror 146 is attached at a predetermined position between the partition plates 116 and 122 described above.

Original illumination lamp 128 and first reflecting mirror 140
The first support frame 150 to which the first
The second support frame 152, to which the second reflecting mirror 142 is attached, is reciprocated between the position shown by the solid line and the position shown by the two-dot chain line in the figure, and the speed of the second support frame 152 is 1/1/1 of the speed of the first support frame.
It is reciprocated between the position shown by the solid line in FIG. 1 and the position shown by the two-dot chain line at a speed of 2. Mainly the second
Referring to the figure, the reciprocating mechanism for reciprocating the first support frame and the second support frame as described above will be described. The rear vertical substrate 103 provided in the housing 100 (see FIG. 3) The electric motor DM is connected via a suitable transmission system (not shown).
(Fig. 1) is connected to the electric motor DM.
A driven pulley 156 and first and second driven pulleys 158 and 160 are rotatably installed. Further, a third driven pulley 162 is rotatably installed on the second support frame 152. A first wire 164 and a second wire 166 are wound around these pulleys in the following manner. One end 164 fixed to rear vertical board 103
The first wire 164 extending from a is first wrapped around the third driven pulley 162, then around the first driven pulley 158, and then wrapped around the driven pulley 1.
56 and further the second driven pulley 1
60, and the other end 164b is fixed to the first support frame 150. On the other hand, rear vertical board 1
A second wire 166 extending from one end 166a fixed to 03 is wound around a third driven pulley 162, and the other end 166b is fixed to the first support frame 150.

As described above, when the driven pulley 156 is rotated at a predetermined speed in the direction of arrow E, the first
The support frame 150 is moved in the direction of arrow E at the peripheral speed of the driven pulley 156, and the second support frame 15
2 is moved in the direction of arrow E at a speed of 1/2 of the above circumferential speed according to the pulley principle, and the driven pulley 156
When is rotated in the direction of arrow F at a predetermined speed,
The first support frame 150 is moved in the direction of arrow F at the same speed as the circumferential speed of the driven pulley 156,
It will be clear that the second support frame 152 is moved in the direction of arrow F on the pulley principle at a speed that is half the circumferential speed.

The optical system 22 as described above is attached to the first support frame 15
0 moves forward from the position shown by the solid line to the position shown by the two-dot chain line at the same speed as the moving speed of the surface of the rotating drum 108, and the second support frame 152 moves at half the moving speed of the surface of the rotating drum 108. When moving forward from the position shown by the solid line to the position shown by the two-dot chain line at a speed of
project onto the surface of Further, the first support frame 150 and the second support frame 152 move back and forth from the position shown by the two-dot chain line to the position shown by the solid line, if necessary, at a higher speed than the forward movement.

Briefly explaining the path of the reflected light rays from the original illuminated on the original illumination lamp 128 attached to the first support frame 150, the reflected light rays from the original first pass through the transparent plate 102 and pass through the first reflecting mirror 14.
0, then reflected by the first reflecting mirror 140 to reach the second reflecting mirror 142, reflected by the second reflecting mirror 142 to reach the in-mirror lens 144, and then reflected in the in-mirror lens 144. The light is reflected by the third mirror 146 through the upright transparent plate 120, and then reflected by the third mirror 146 and reaches the surface of the rotating drum 108. In this optical path, as the first support frame 150 and the second support frame 152 move, the document illumination lamp 128, the first reflecting mirror 140, and the second reflecting mirror 142 move back and forth. When scanning a document by scanning a document, the document illumination lamp 128 and the first reflecting mirror 140 move at the same speed as the surface speed of the rotating drum 108, while the second reflecting mirror 142 moves at the same speed as the surface speed of the rotating drum 108, as described above. Because it moves at half the speed of the document, the optical length from the document to the lens of the in-mirror lens 144 and the optical length from the lens of the in-mirror lens 144 to the surface of the rotating drum 108 are is maintained substantially constant at all times. In addition, if the upright transparent plate 120 is made of the same material and has the same thickness as the transparent plate 102 on which the original is placed, the transparent plate for the optical path from the original to the lens of the in-mirror lens 144 is 102 influence, i.e. refractive index and in-mirror lens 14
The influence of the upright transparent plate 120 on the optical path from the lens of No. 4 to the surface of the rotating drum 108, that is, the refractive index, is equal, and therefore the optical system 22 Each element can be positioned.

Therefore, in the electrostatic copying apparatus as described above, when replacing the first wire 164 or the second wire 166 that was cut during initial assembly or after long-term use, the first wire 164 or the second wire 166 is replaced. Reflector 140
(Thus the first support frame 150 on which it is attached)
It is necessary to separate the second reflector 142 (therefore the second support frame 152 on which it is mounted) from each other as required to accomplish the so-called wire hooking in the interlocking mechanism. However, the mutual distance between the first reflecting mirror 140 and the second reflecting mirror 142 changes depending on their respective positions because the moving speed of the latter is half that of the former. Therefore, conventionally, the first reflecting mirror 140 and the second reflecting mirror
A plurality of spacing gauges and the like are required for mutual positioning with the reflecting mirror 142, which is complicated and is likely to cause errors.

However, in the optical system 22 of the electrostatographic copying apparatus improved according to the present invention, the first support frame 150
A block portion of the second support frame 152, for example, a block portion 150a having a hole through which the suspension rod 148b passes, and a block portion of the second support frame 152, for example, the suspension rod 14.
A block portion 152a having a hole through which the block portion 8b passes is set to a predetermined size. The suspension rod 1 is fixed near the right end of the rear vertical board 103 together with the block parts 150a and 152a.
Support bracket 1 supporting the right end of 48b
The stationary member, which may be 68 (FIG. 3) itself, cooperates,
It constitutes positioning means for the first support frame 150 and the second support frame 152. That is, in the illustrated optical system 22, the first support frame 150 and the second support frame 152 are moved beyond the reciprocating range of copy scanning, and in the illustrated example, beyond the end point of the forward movement, that is, the first support frame 150 and the second support frame 152 are 1 beyond the position indicated by the two-dot chain line in FIG. 1, and then moved to the right in FIG. Block portion 150a of support frame 150 of No. 1
The right end of the block part 152 of the second support frame 152
If it comes into contact with the left end of a, the first support frame 150
and the second support frame 152 are set in the required positional relationship, and the first reflecting mirror 140 and the second reflecting mirror 142 are set in the required spaced relationship (such work is performed by
(This must be carried out before the partition plate 122 that obstructs the movement of the second support frame 152 is installed in a predetermined position, or after the partition plate 122 installed in a predetermined position is removed) .
Therefore, during assembly or repair, the block portion 150a of the first support frame 150 and the second support frame 15
2 block portion 152a and support bracket 16
8 are abutted against each other as described above to effect wire hooking of the first wire 164 to the second wire 166, thus holding the first support frame 150 and the second support frame 152 in a predetermined position relative to each other. the first support frame 1
50 and the second support frame 152, for example, may be moved to the scanning start position shown by the solid line in FIG.
In addition, in the illustrated example, the first support frame 15
0 and the second support frame 152 move forward in a direction in which the separation distance between them gradually decreases (to the right in FIG. 1), and in a direction in which the separation distance between them gradually increases (in the first direction).
(left side in the figure), but for example,
As described in Publication No. 72786, the first support frame and the second support frame move in a direction in which the distance between them gradually increases, and in a direction in which the distance between them gradually decreases. In the specific example of backward movement, during the above-described wire hooking operation, the first support frame and the second support frame are moved beyond the end point of the backward movement of the reciprocating range of copy scanning.

Furthermore, in the optical system 22 of the illustrated electrostatographic reproduction apparatus improved in accordance with the present invention, positioning or focusing of the in-mirror lens 144 is also easier to accomplish than in conventional optical systems 22. It is composed of

Conventionally, the positioning of the in-mirror lens 144 is as follows:
Check whether the image of the document placed on the transparent plate 102 is correctly formed on the surface of the rotating drum 108 by actually observing the image projected on the surface of the rotating drum 108, and This was accomplished by finely adjusting the position of the lens 144. However, since it is necessary to arrange various devices such as a developing device around the rotating drum 108, the rotating drum 108 is generally arranged approximately at the center of the housing 100, and the various devices such as the developing device arranged around it are rotated. Because the view to the surface of the drum 108 is obstructed, it is relatively difficult to observe the surface of the rotating drum 108 while finely adjusting the position of the in-mirror lens 144.

However, in the optical system 22 of the illustrated electrostatographic copying apparatus improved in accordance with the present invention, the mirror surface of the third mirror 146 is separated by the same optical length as the rotating drum 108. At this position, a translucent imaging member, such as frosted glass (member 170 shown in double-dashed lines in FIG. 1), can be temporarily mounted.

In the optical system 22 as described above, the in-mirror lens 144 can be positioned relatively easily as follows. That is, when positioning the in-mirror lens 144, the imaging member 170 is placed in a predetermined position while not only the right side wall of the housing 100 and the partition plate 126 but also the third reflecting mirror 146 are not attached. Installing. In this way, the image of the original placed on the transparent plate 102 is projected onto the imaging member 170. Imaging member 17
0 is the right side wall of the housing 100 (not attached when positioning the in-mirror lens 144)
Since the image forming member 170 is located near the image forming member 170 and is made of a semitransparent member such as frosted glass, the original image projected onto the front surface of the image forming member 170 can be easily observed from the back surface of the image forming member 170. Therefore, the position of the in-mirror lens 144 can be easily finely adjusted while observing the original image projected onto the surface of the imaging member 170. As described above, the optical length of the imaging member 170 from the surface of the third reflecting mirror 146 installed later to the surface of the imaging member 170 is such that the original image on the rotating drum 108 is Since the in-mirror lens 14 is mounted at the same position as that of the projected portion, the in-mirror lens 14 is located at a position where the original image is correctly formed on the surface of the image forming member 170.
After positioning and fixing mirror 4, the third reflector 1
46, the original image will be correctly formed on the surface of the rotating drum 108.

After positioning and fixing the in-mirror lens 144, the imaging member 170 is removed, and the third reflecting mirror 146, the partition plate 126, and the right side wall of the housing 100 are attached. Furthermore, the imaging member 1
The space between divider plate 126 and divider plate 116, in which 70 is temporarily mounted, is provided for housing the electrical means necessary to operate and control the various components of the electrostatographic apparatus. It is used as a space.

<Effects> As described above in detail, in the electrostatic copying apparatus improved according to the present invention, the first and second support frames are scanned for copying when performing wire hooking in the reciprocating mechanism. The block portion of the second support frame is brought into contact with the stationary member present at one end of the suspension rod, and the block portion of the first support frame is moved beyond the reciprocating range of the second support frame. The first reflecting mirror and the second reflecting mirror can be quickly and easily set to a predetermined spacing relationship by a simple operation of bringing them into contact with the block portion.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of an electrostatic copying apparatus improved in accordance with the present invention. FIG. 2 is a simplified partial perspective view showing the optical system in the electrostatic copying apparatus of FIG. 1. FIG. 3 is a partially cutaway perspective view showing an upper portion of the electrostatic copying apparatus of FIG. 1; 2... Photosensitive member, 6... Developing device, 20... Charging corona discharger, 22... Optical system, 36... Transferring corona discharger, 102... Transparent plate, 108...
... Rotating drum, 112 ... Transfer paper conveyance system, 128
...Original illumination lamp, 140...First reflecting mirror,
142... Second reflecting mirror, 144... In-mirror lens, 146... Third reflecting mirror, 148a, 1
48b... Suspension rod, 150... First support frame, 150a... Block portion of first support frame, 1
52...Second support frame, 152a...Block portion of second support frame, 156, 158, 160, 16
2... Pulley, 164, 166... Wire, 168
...Support bracket (stationary member).

Claims (1)

[Scope of Claims] 1. An optical system for projecting an image of a document to be copied onto the surface of a photosensitive member, and a scanning section of the optical system includes a first and a first scanning section reciprocatably mounted on a suspension rod. A second support frame, a first reflector attached to the first support frame, a second reflector attached to the second support frame, and a moving speed of the second support frame. a reciprocating mechanism including a pulley and a wire for reciprocating the first support frame and the second support frame so that the movement speed of the first support frame is half the moving speed of the first support frame; In an electronic copying machine; each of the first and second support frames is provided with a block portion set to a predetermined size, and the first and second support frames are configured to move beyond the reciprocating range of copy scanning. The block portion of the second support frame is brought into contact with a stationary member present at one end of the suspension rod, and the block portion of the first support frame is moved against the stationary member of the second support frame. When brought into contact with the block portion, the first reflecting mirror and the second reflecting mirror are set in a predetermined spaced relationship,
An electrostatic copying apparatus, characterized in that it is configured to be able to carry out wire hooking in the reciprocating mechanism.