JPH0375671A - Copying machine - Google Patents

Abstract

PURPOSE:To simplify adjustment of focusing and to obtain a stable image by carrying out positioning of a first frame of a scanning means, a second frame of an optical system, and frame members by engagement of pins utilizing gages and fixing the spacing of pins on the gages responding to image forming distance of a lens. CONSTITUTION:In a lamp unit 26 of a scanning means, a reflecting mirror 102 and a first mobile mirror 103 are supported by the first frame, that is, a facing L-shaped side plate 27, and the mirror unit 29 is constituted from the second frame consisting a thin plate bent into U-shape, that is a mirror retaining part 1 and a pair of mobile mirrors 104 and 105. Then positioning holes 28, 30, 31, 22a, and 22b are formed on the first and the second frames and frame members 27, 1, and 19 to position them, and by engaging the gage pins to the positioning holes 28, 30, 31, 22a and 22b, the first and the second frames and the frame members 27, 1, and 19 are positioned in the direction of scanning and the direction which crosses it. Thus, the adjustment of the mirror unit can be simplified and a stable image can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic copying machine, and more particularly to a copying machine in which the height and movement direction of an optical system can be determined.

[Conventional technology]

In a copying machine, the optical system is an important element in image formation. FIG. 9 is a schematic vertical sectional view showing the configuration of the optical system of a conventional copying machine.

In the figure, reference numeral 101 denotes a glass document table provided on the top surface of the copying machine, and the document table 101 has a document 90 to be copied.
is placed. A lamp unit 26 is provided below the document table 101 as a scanning means for exposing and scanning the document 90. The lamp unit 26 is a light source 1OO1
A reflecting mirror 102 having an elliptical cross section for irradiating light from the light source 100 in the direction of the original 90 and a first movable mirror 103 fixed to the reflecting mirror 102 and reflecting the original image exposed by the light source 100. configured. The original image reflected by the first movable mirror 103 enters a pair of second movable mirrors 104 and 105, and is reflected by them in the opposite direction.
incident on . The second movable mirrors 104 and 105 are attached to the mirror holding part 1 at a dogleg-shaped attachment angle, and move in the same direction as the lamp unit 26 at a moving speed of % of the lamp unit 26. A mirror unit 29 is constituted by these movable mirrors 104, 105 and the four-sided holding part 1.

The original image incident on the imaging lens 106 is reflected again in the opposite direction by a pair of first fixed mirrors 107 and 108, and then passes through a second fixed mirror 109 and an infrared absorption filter 110 to a photosensitive material charged to a predetermined potential. The drum 33 is exposed to form a latent image thereon.

On the other hand, the imaging distance of the imaging lens 106 has a slight error for each lens, and the lens manufacturer measures this for each lens and displays it on each lens. For example, if the design value is in the hundreds range, there is an error of about 1%, that is, a few milliliters.

[Problem to be solved by the invention]

However, in conventional copying machines, the height and scanning direction positional relationship between the lamp unit 26 and the mirror unit 29 are not determined, and when so-called out-of-focus occurs due to fluctuations in the imaging distance of the lens, it is difficult to move each unit in either direction. There was a problem in that it took a long time to adjust the focus because it was difficult to decide whether to move or not, and the camera had to adjust the position and focus while looking at the actual image. Furthermore, even when the focus is correct, the mounting height of the copying machine in the sub-scanning direction is different, and as shown by the broken line in Figure 9, the mirror unit 2
When the front side of the lens 9 shifts downward from its normal position, the optical axis shifts vertically as shown by the broken line. Therefore, the image on the photosensitive drum 33 changes in the sub-scanning direction as shown in FIG. An image will be formed and the perpendicularity of the image will be shifted.

Furthermore, even if the installation height is the same, the lamp unit 2
If the positions of the mirror unit 6 and the mirror unit 29 in the scanning direction are shifted at both ends in the sub-scanning direction, the typing exposed on the photosensitive drum 33 will be shifted, and the leading and trailing edges of the image will be tilted as shown in FIG. 10 (111). Thus, a distorted parallelogram image is formed.

There is a problem in that if the lamp unit and the lamp unit are misaligned in this way, a normal image cannot be formed on the photosensitive drum 33.

The present invention has been developed in view of the above circumstances, and it is possible to position each unit using a gauge with a bottle installed when assembling the lamp unit and mirror unit into the frame, and to determine the mechanical positional relationship. It is an object of the present invention to provide a copying machine that simplifies the adjustment of the mirror unit and throat during focus adjustment and can obtain a stable image on a photosensitive drum.

[Means to solve the problem]

A copying machine according to the present invention includes a light source that illuminates an original, a first mirror that reflects light from the original, and a first mirror that holds them.
a movable mirror unit having a second frame that holds the mirror and moves in the scanning direction of the scanning means; and a frame member that supports the second frame movably in the scanning direction. It is characterized by having a plurality of positioning holes that fit into the pins for positioning in the scanning direction and in the direction crossing the scanning direction.

[Effect]

In the copying machine of the present invention, positioning holes are formed in the first and second frames and the frame member for positioning them, and by fitting the gauge bottle into the positioning holes, the first and second frames are aligned. A frame and a frame member are positioned in a scanning direction and a direction intersecting the scanning direction.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on drawings showing embodiments thereof.

FIG. 1 is a longitudinal sectional view showing the internal structure of a copying machine according to the present invention (hereinafter referred to as the apparatus of the present invention). Copying device main body 50
As shown in FIG. 1, a document table 101 made of a transparent glass plate is fixedly provided on the upper surface of the document plate. An automatic document feeder 301 is attached to the upper part of the document table 101 by a hinge at the end thereof.

The automatic document feeder 301 is for taking in and transporting the document 90 placed on the document tray 302, and the copied document passing through the automatic document feeder 301 is sent to the document tray 306.

A light source 100 for exposing and scanning the original 90 is provided below the original table 101 of the main body 50. Light source 100 is movable from one end of document table 101 to the other end, and vice versa. This movement of the light source 100 in the left-right direction is achieved by driving the servo motor 66. In relation to the light source 100, a reflecting mirror 1 whose cross section is elliptical.
02 is provided, and the reflecting mirror 102 includes a first movable mirror 1
03 is fixed. These lights 'tX100, the reflecting mirror 102, and the first movable mirror 103 constitute a lamp unit 26 which is a scanning means.

When the lamp unit 26 including the light source 100 is moved by the servo motor 66 in the direction of arrow a within the frame 19 described later, the original 90 placed on the original carriage 101 is exposed to slit light.

In relation to the first movable mirror 103, a pair of second movable mirrors 1
02 and 105 are provided. The pair of movable mirrors 104 and 105 are for reflecting the original image reflected by the first movable mirror 103 toward the imaging lens 106 again. The second movable mirrors 104 and 105 move the light source 10 inside the frame 19 at a speed of % of the moving speed of the light source 100.
Move in the same direction as 0. Note that the imaging lens 106 is
It is constituted by a zoom lens, and therefore the copying magnification of the copying machine of this embodiment can be changed.

In front of the imaging lens 106, a pair of fixed lenses are provided to reflect the original image transmitted through the lens 106 again toward a fixed reflecting mirror 109, which reflects the original image toward the photosensitive drum 33, which is rotated in the direction indicated by the arrow. vt107.108 Kati.

That's it. An infrared absorption filter 110 is interposed between the fixed reflecting mirror 109 and the photosensitive drum 33.

The movable mirrors 104 and 105 are integrally held by a mirror holding part l (see Fig. 2), which will be described later, and are movable! 10
A mirror unit node 29 of the optical system is constructed from the 4.105 and the ξ mirror holding portion l.

The exposure position of the photosensitive drum 33, that is, reflection! A partial cursor lamp 111 is provided upstream of the position where the original image is formed by fl 109. The partial silage lamp 111 is for removing unnecessary electrostatic latent images on the photosensitive drum 33. A charging corotron 112 for uniformly charging the photosensitive drum 33 with a specific polarity is provided further upstream of the partial silage lamp 111.

A developing device 11 is located downstream of the exposure position of the photosensitive drum 33.
3 is a provision. The developing device 113 is a charging corotron 1
12. The electrostatic latent image formed on the photosensitive drum 33 by the light source 100 and the imaging lens 106 is developed using toner. The developing device 113 is provided with an agitation roller for agitating the toner and a supply roller for supplying the charged toner to the photosensitive drum 33.

A paper feed section is formed on the lower side of the copying device main body 50,
As shown in the figure, a paper feed force sensor 150 is detachably attached to the paper feed unit. In the paper feed cassette 150, sheets 151 are stored in a stacked manner.

A transfer corotron 114 is located downstream of the developing device 113.
and a separation corotron 115 are integrally provided.

When the paper 151 is supplied from the paper feeding case 150, the toner image formed on the photosensitive drum 33 is transferred to the transfer corotron 11.
4, it is transferred to its G151. During the transfer by the transfer corotron 114, the Gion 151 is attached to the photosensitive drum 33.
However, it is separated by the dispensing corotron 115 and sent toward the vacuum conveyor 116.

A cleaning device 117 is provided along the photosensitive drum 33 on the downstream side of the separation corotron 115.

The cleaning device 117 removes toner remaining on the photosensitive drum 33 without being transferred to the cover 151. This cleaning device 117 includes a rubber blade 118 for scraping off residual toner on the photosensitive drum 33.
including. The residual toner scraped off by the blade 118 is sent to a waste toner container (not shown) by a screw conveyor 119.

Further downstream of the cleaning device 1170, a charge eliminating lamp 120 for removing residual charges on the photosensitive drum 33 is provided. Further downstream of the static elimination lamp 120, the above-mentioned charging corotron 112 is arranged.

The paper 151 separated from the photosensitive drum 33 by the separating corotron 115 is sent to the fixing device 121 by the vacuum conveyor 116. The fixing device 121 has a heating roller with a built-in heater and a pressure roller for pressing the paper against the heating roller, and the toner image transferred onto the paper 151 is heated by the heating roller and the pressure roller. , and is fixed on the paper 151 by applying pressure. After fixing, the paper 151 is discharged onto a paper discharge tray (not shown) by a pair of rollers 122.

A control box 130 is formed above the vacuum conveyor 116. Inside the control box 130, circuit components 131 for a control system are housed.

Next, the configuration of the optical system, which is the gist of the present invention, will be explained.

FIG. 2 is a perspective view showing the structure of the frame 19 that supports the optical system. The frame body 19 has opposing guide frames 40.40
and a connecting frame 4L41 that connects them. The guide frame 40° 40 has a channel steel-like cross section, and the guide frame 4 is located in the center of the web part.
A guide rail 23.23 having approximately the same length as 0.40 mm is attached. The guide rails 23.23 have an upright cross section, and the upper surface thereof serves as a first guide portion 24 for supporting and guiding the lamp unit 26. Further, a second guide portion 25, which protrudes from the tip of the L-shape, is formed approximately half the length of the guide rail 23.23 from the left side in FIG. 2 in the longitudinal direction. The second guide portion 25 is for supporting the mirror unit 29.

In addition, when assembling the frame 19, the lower four corners of the frame 19 are
Four round holes 20 for determining the right angle and parallelism of the frame 19
, 20... are opened. Also, guide frame 4
An imaging lens 10 is installed on the lower flange of 0.40 mm at an appropriate distance apart.
A circular hole 21a and an elongated circular hole 21b are opened for positioning a lens unit (not shown) incorporating a lens unit 6.

Furthermore, a round hole 22a and an oblong hole 22b for positioning the lamp unit 26 and the light unit 29 are formed at one end of the upper side of the guide frame 40.40.

FIG. 3 is a partially enlarged perspective view of the lamp unit, in which the lamp unit 26 has a reflecting mirror 102 and a first movable mirror 103 with opposing L-shaped side plates 27 (one not shown) serving as a first frame. I support it. A circular hole 28 for positioning is bored in one side of the side plate 27.

FIG. 4 is a partially enlarged perspective view of the ξ-ray unit, in which the mirror unit 29 is a second frame made of a thin plate bent in a U-shape, and the mirror holding part 1 and a pair of movable mirrors 104.
．． 105. A collar part 2 is formed on one side in the scanning direction of both ends of the holding part 1 in the longitudinal direction (=sub-scanning direction) by bending both ends outward, and a height adjustment member 5 described later is attached thereto. has been concluded.

A bracket 18 is fastened to the other side surface of the mirror holding section 1 in the scanning direction. An L-shaped mounting portion is provided at one end of the bracket 18, where a ξ-lar holding portion l is provided.
The sides are fastened. The height adjusting members 5, 5 mentioned above are fastened to the other end, and the tips of these two height adjusting members 5.5 abut against the guide rail 25, and the mirror unit 1. , the positioning of the height direction is performed. Furthermore, positioning round holes 30 and 31 are formed above the bracket 18 and below the flange 2 of the mirror holding section 1.

FIG. 5 is a perspective view showing the structure of the height adjusting member, and FIG. 6 is a bottom view of the main body of the height adjusting member. Bolt holes 3 for mounting the height adjustment member 5 are provided at one end of the flange 2 and the bracket 8.
3 and a round hole 4 are opened. The height adjustment member 5 includes a disc-shaped main body 6 having a central hole 7 in the center, two license-shaped mounting seats 8°8 that are fixed to the outside facing the center and have mounting holes, and a lower surface thereof. 4 pairs of implanted opposing pins 9.9, 10,10, 11,11, 12.1
2 and a slider section 13. These pins 9 to 12 are gradually shortened in length as they proceed from pin 9 to pin 12. A slider portion 13 is attached to a position facing the main body 6 with the flange portion 2 or the bracket 18 in between. The slider portion 13 has a top-like shape consisting of a boss portion 17a and a top portion 17b, and the bottom surface 31 has a substantially hemispherical shape. A screw hole 16 is formed in the center of the slider section 13, and the slider section 13 is attached to the main body 6 with a bolt inserted into the center hole 7 of the main body 6. Also, the slider part 1
Two fitting holes 14.14 and six fitting holes 15.15... are formed on the upper surface of the piece part 17b of No. 3. Fitting hole 14.14 is for height adjustment, fitting hole 15.15
... is deeper than the length of pin 9.

On the other hand, as shown in FIG. 1, a pulley 63 is rotatably attached to one end on both sides of the frame 19, and a pulley 63 is attached to the other end.
5 and a drive pulley 64 attached to a servo motor 66
is installed. Further, pulleys 61 and 62 are rotatably attached to both sides of the mirror holder 1. Then, one ends of two wires 60 with springs attached are attached to one end side of the frame 19, and the wires 60 are connected to the pulley 61,
After winding around the pulley 63 and drive pulley 64, the pulley 65
, is wound around the pulley 62, and the other end is attached approximately to the center of the frame I9. As a result, the mirror unit 29 is moved at a speed of % of the lamp unit 2G.

Next, a procedure for assembling the copying machine of the present invention will be explained. First, the procedure for assembling the height adjusting member of the holding portion 1 will be explained based on FIGS. 5 and 6.

The height adjustment member 5 is attached to the flange 2 provided on the mirror holding part I, and the round hole 3 provided in the flange 2 or the bracket 18 is attached.
, 3 into the mounting holes of the mounting seats 8, 8, respectively, and fix them with screws. Next, the boss portion 17a provided on the slider portion 13 is fitted into the round hole 4. At this time, pins 9 to 12 and fitting hole 1
It is opposite to 4, 14 and 15, 15...
They are in a mating relationship. For example, the case where the pin 11 and the fitting hole 14 are fitted is set as the design dimension, and temporary fixing is performed.

Next, a procedure for assembling the lamp unit throat 26 and the mirror unit 29 into the frame body 19 will be explained. FIG. 7 is a perspective view illustrating the installation procedure.

First, the pins 38a, 38b... of the first gauge 38 with pins 38a, 38b... implanted in the four corners of the flat plate are fitted into the four round holes 20, 20 of the frame body, and the frame body 19 is It is placed on the first gauge 38, the guide frames 40, 40 and the connecting frames 4], 41 are connected, and the frame 19 is assembled. This is necessary to determine the squareness and parallelism of the frame 19. Next, the first gauge 38 is inserted into the round holes 21a and 21b of the frame 19.
The lens unit (not shown) is positioned and fastened to the frame 19 by fitting the pin (not shown).

Next, the second gauge 36 is used to adjust the scanning direction and height direction of the comb unit 29. The second gauge 36 is formed by planting four pins 36a to 36d on a flat plate.
a is inserted into the round hole 30 of the mirror holding part l, and the pin 36b is inserted into the frame 1.
9, the pin 36c is inserted into the round hole 22a, and the pin 36d is inserted into the round hole 31, respectively.

By fitting the second gauge 36 into the hole, the sea unit 29 is positioned with respect to the frame 19 in the main scanning direction and the height direction. If a gap occurs between the bottom surface 31 and the guide part 25 during adjustment using the second gauge 36, this means that the height adjustment member 5 is shorter than the designed dimension, so rotate the slider part 13 in the direction C in FIG. By making the pin 1o or 9, which is longer than the pin 11, fit into the fitting hole 14, the correct height dimension can be adjusted.

If the second gauge 36 cannot be used to fit the slider part 13 and the height adjustment member 5 together, it means that the mounting dimensions of the slider part 13 and the height adjustment member 5 are too long than the designed dimensions, so rotate the slider part 13 in the direction d in FIG. This allows the pin 12, which is shorter than the pin 11, to fit into the fitting hole 14, so that the correct height dimension can be adjusted. In this way, the unit 2
9 is positioned in the height direction and main scanning direction, the second
The gauge 3G is removed from the frame 19, and then the lamp unit 26 and mirror unit 29 are positioned in the main scanning direction using the third gauge 37. The third gauge 37 is made up of four wooden pins 37a to 37d planted on a flat plate, and the pin 37a is ξ
The pin 37b is inserted into the round hole 31 of the holder 1, the pin 37b is inserted into the long round hole 22b of the frame 19, the pin 37c is inserted into the round hole 22a, and the pin 37d is inserted into the round hole 22a of the frame 19.
is a round hole 28 made in the side plate 27 of the lamp unit 26.
It is planted in such a position that it mates with the By fitting the third gauge 37 into the hole, the mirror unit 29 and lamp unit 26 are positioned in the main scanning direction. By stretching the wire 60 around each pulley in this state, the predetermined dimensions of the mirror unit 29 and the lamp unit 26 are ensured.

Note that the second and third gauges must be fitted from both sides of the frame 19 at the same time.

For example, adjustment of the mirror unit 29 in the main scanning direction due to a change in the focal length of the imaging lens 106 is performed using the imaging lens 106.
The third gauge 37 is manufactured in advance in accordance with the imaging distance displayed in i! By translating the information, adjustments can be made in a short time.

Furthermore, the structure of the slider portion 13 not only forms a fitting hole, but also forms a helical slope on the upper surface of the top portion 17b, as shown in FIG. 8, so that the height can be adjusted. Good too.

Note that in this embodiment, positioning in the height direction and main scanning direction was performed using two gauges, the second and third gauges, but the present invention is not limited to this, and positioning in two directions can be performed using one gauge. Needless to say, you can go there.

〔effect〕

As explained above, in the present invention, the first frame of the scanning means, the second frame of the optical system, and the frame member are positioned by pin fitting using a gauge, so that a stable image can be obtained on the photosensitive drum. In addition to being able to obtain
By determining the pin spacing of the gauge according to the imaging distance of the lens, excellent effects such as simplifying focus adjustment can be achieved.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the structure of a copying machine according to the present invention, FIG. 2 is a perspective view showing the structure of the frame, FIG. 3 is a partially enlarged perspective view of the lamp unit, and FIG. - A partially enlarged perspective view of the unit; FIG. 5 is a perspective view showing the configuration of the height adjustment member;
Fig. 6 is a bottom view of the main body of the height adjustment member, Fig. 7 is a perspective view illustrating the procedure for assembling the lamp unit and mirror unit, and Fig. 8 shows another embodiment of the slider portion of the height adjustment member. FIG. 9 is a schematic vertical sectional view showing the configuration of an optical system of a conventional copying machine, and FIG. 10 is a diagram illustrating distortion of an image on a photosensitive drum. 1...Mirror holding part 19...Frame body 22a...
Round hole 22b... Oblong hole 26... Lamp unit
27... Side plate 28... Round hole 29... Mirror unit 30... Round hole 3... Round hole 36... Second
Gauge 37...Third gauge 50...Copier main body
100... Light source 103... First movable mirror 104.
105...Second movable mirror patent Applicant Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A light source that illuminates a document, a first mirror that reflects light from the document, and a first frame that holds them;
a scanning means for scanning the original, a pair of mirrors, and a second mirror that holds the mirror and moves in the scanning direction of the scanning means;
A copying machine comprising a movable mirror unit having a frame, and a frame member movably supporting the first and second frames in the scanning direction, wherein the first and second frames and the frame member are in predetermined positions. 1. A copying machine, wherein positioning in the scanning direction and a direction crossing the scanning direction is to be performed by a gauge having a plurality of pins embedded therein, and the copying machine has a plurality of positioning holes into which the pins are fitted.