JPS6214677A - Small-sized electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To obtain superior carrying performance by providing a main body mounted on an original surface, a couple of pinch rollers, an electrostatic charging brush, an optical scanning system, and a developing drum. CONSTITUTION:When the main body 12 has an opening/closing lid 16 opened, a gap is formed between both pinch rollers 19 and 20, so electrophotographic sensitive paper 13 is easily inserted into between both pinch rollers 19 and 20. An image forming lens 34 which forms an image of both-image information of the original surface 11 on the surface of the electrophotographic sensitive paper 13 positioned at the longitudinal wall part of a guide plate 18 for the electrostatic charging and exposure of the electrostatic charging brush 21 and the couple of pinch rollers 19 and 20 is fixed to a lens holder 36 formed inside a window plate 35, and a partition plate 37 formed on the main body 12 functions as a mask which controls an image formation area.

Description

[Detailed Description of the Invention] <Industrial Applications> The present invention provides a compact, wet-type electronic photograph with excellent portability, which is placed on the surface of a document and copies image information on the surface of the document. Relating to a copying device.

<Prior art> Conventionally known electrophotographic copying devices include
There are two types: xerography, in which the surface of a photoconductive insulating material is electrically charged and image information is exposed there, and a toner image of the electrostatic latent image is formed and fixed on transfer paper, and the other is the surface of the photoconductive paper. There is an electrofax method in which the electrostatic latent image is charged and exposed to light, and the electrostatic latent image is developed with toner.

After xerography-based electrophotography, the photocopying device is equipped with a light source, a band (
It also has a developing device, a transfer device, a fixing device, etc., and an electrofax type electrophotographic copying device is composed of a light source, a charging device, a developing device, etc.

<Problems to be solved by the invention> The light source in conventional electrophotographic copying devices needs to be powerful for high-speed exposure, and the charger itself using corona discharge must also generate a high voltage, making it large and Moreover, the power consumption is extremely large, making it difficult to use a battery as a power source. In addition, the pressure fixing type requires a powerful reduction roller, and compared to the electrofax type, an extra toner cleaner, transfer device, etc. must be installed, and the overall size of the device increases. It is impossible to avoid this. By the way, with the conventional ones, the size was at most about the size of a handbag. Moreover, constant maintenance is required to obtain high-quality copied images. Incidentally, in the type of heat fixing, a heater is required, resulting in a further increase in power consumption.

On the other hand, electrofax-type electrophotographic copying machines that use a liquid developer (hereinafter referred to as developer) are only stationary types due to problems such as the sealing properties of the developer, and xerography Although it is possible to make it smaller than the conventional method, it is not portable and cannot be easily carried around due to problems such as maintenance.

If we are trying to make a copying machine smaller and lighter so that it can be held in one hand, we can consider using wire dot printers or thermal printers, but this increases the cost due to photoelectric conversion of image information, and the resolution of the image is poor, making it difficult to make fine and clear images. It is essentially impossible to expect good image quality.

Based on this knowledge, it is an object of the present invention to provide an electrophotographic copying device that is compact enough to be held in one hand, can be powered by a battery, and has excellent portability and can be carried around without any inconvenience.

Means for Solving the Problems> The electrophotographic copying apparatus of the present invention includes a main body in which a roll of electrophotographic photosensitive paper is rotatably stored and placed on a document surface; a pair of pinch rollers that pinch photographic paper and are rotatably attached to the main body and feed out the electrophotographic paper; and a pair of pinch rollers that are attached to the main body so as to come into sliding contact with the electrophotographic paper. A charging brush electrostatically charges the paper, and as the electrostatically charged electrophotographic paper moves, the document surface is scanned, and image information of this document surface is projected onto the electrophotographic paper to form an electrostatic latent image. A scanning optical system is attached to the main body and rotates in conjunction with the pair of pinch rollers, and a developer solution that oozes out onto the outer peripheral surface is stored inside to form an electrostatic potential on the electrophotographic photosensitive paper. It is equipped with a developing drum that develops the image with toner.

Function: The electrophotographic paper fed out by a pair of pinch rollers slides into contact with a charging brush to which a voltage is applied, and its surface is charged, and this image information is transferred to the scanning optical system that scans the image information on the document surface. The images are sequentially projected and exposed onto electrophotographic paper, and an electrostatic latent image of image information is formed on the electrophotographic paper. This electrostatic latent image is developed with toner using a developer seeped from the outer peripheral surface of a developing drum that rotates as the electrophotographic paper moves, and a toner image of this image information is formed on the electrophotographic paper.

Embodiment As shown in FIG. 1 showing the cross-sectional structure of an embodiment of the electrophotographic copying apparatus according to the present invention and FIG. 2 showing its appearance, one end of the main body 12 placed on the document surface 11 is A paper roll shaft 14 that rotatably supports a roll of electrophotographic photosensitive paper 13 is provided in the section. The lower side is an opening/closing lid 16 rotatably attached to the main body 12 via a hinge 15. The electrophotographic photosensitive paper 13 of this embodiment is one in which a fine powder of zinc oxide or the like, which becomes photosensitive when charged, is applied to the surface through a binder.

FIG. 3 shows an enlarged view of the mechanism of the opening/closing lid 16, FIG. 4 shows the drive mechanism of the movable part of this embodiment, FIGS. 5 and 6 show the planar structure and right side structure thereof, and the bottom surface thereof. As shown in FIG. 7 showing the shape, an electrophotographic photosensitive paper 1 is rotatably supported within a main body 12 by a paper roll shaft 14.
3; the direction is changed by the roller 17 and guided by the charging/exposure guide plate 18, held between a pair of pinch rollers 19 and 20, and fed out as the pinch rollers 19 are rotated. The charging/exposure guide plate 18 has a cross-sectional shape having a horizontal wall portion and a vertical wall portion, and a charging brush 21 is fixed to the opening/closing lid 16 facing the horizontal wall portion, and the tip of the charging brush 21 is charged. - It is designed to come into sliding contact with the surface of the electrophotographic photosensitive paper 13 located on the side wall portion of the exposure guide plate 18.

The charging brush 21 is connected to an electric circuit (not shown) driven by a battery power source 22 housed in the main body 12.
By applying a voltage to this charging brush 21, the electrophotographic photosensitive paper 13 is charged. In this embodiment, the electrophotographic paper 13 is wound so that the photoconductive photosensitive layer is on the inner circumferential side, but electrophotographic paper 13 is used that is wound so that the photosensitive layer is on the outer circumferential side. Of course, it is also possible to use Further, the reference numeral 33 in FIG. 7 is a lid for replacing the battery power source 22, and the battery power source 2 is used as a power source.
It is of course possible to use an external power source in addition to 2.

Of the pair of pinch rollers 19 and 20, the drive pinch roller 19 is rotatably supported by the main body 12 via a bearing bush 23, and the worm wheel 24 fixed to the shaft end thereof is installed inside the main body 12. The pinch roller 19 is engaged with a worm 26 connected to a drive motor 25, and the drive motor 25 rotates the drive pinch roller 19. Note that the drive motor 25 is also driven by the battery power source 22 via an electric circuit (not shown). The other pinch roller 20 has both ends connected to a pair of left and right swinging levers 2.
It is rotatably supported at the tip of 7 and rotates as a result. The swing lever 27 has a bell crank shape, is rotatably supported by the main body 12 at its bent portion by a support pin 28, and has one end connected to a spring 29 fixed to the main body 12. Further, an engaging pin 30 is implanted at the other end of the swing lever 27, and a notch 31 is formed at the tip of the opening/closing lid 16 to removably engage with the engaging pin 30. When the lid 16 is closed, they are engaged and the driven pinch roller 20 is pressed toward the driving pinch roller 19 by the spring 29.

Therefore, when the opening/closing lid 16 is opened, the swing lever 27 is initially moved by the spring 2 via the engagement pin 30 as the opening/closing lid 16 is opened.
When the pinch rollers 19 and 20 rotate in the direction of separation against the rotational force 9 and the opening/closing lid 16 is further opened, the engagement between the engagement pin 30 and the notch 31 is released due to the difference in rotation radius. . At this time, the rotation of the swing lever 27 causes the spring 2 to
The fixed position of 9 with respect to the swinging lever 27 is the swinging lever 2
7 and the fixed position of the spring 29 relative to the main body 12. In this state, the swing lever 27 is moved by the spring 29 to both pinch rollers 1.
9 and 20 are urged apart, and both pinch rollers 19
, 20 are kept spaced apart from each other. Note that after the engagement pin 30 and the notch 31 are disengaged, the opening/closing lid 16 can be opened independently. When the opening/closing lid 19 is closed, the notch 31 engages with the engagement pin 30 during the closing process to rotate the swing lever 27 and drive the driven pinch roller 20. It is brought into contact with the pinch roller 19.

In short, when the lid 16 is opened, a gap is formed between the pinch rollers 19 and 20, so the electrophotographic photosensitive paper 13 can be easily inserted between the pinch rollers 19 and 20. When the lid 16 is closed, the electrophotographic paper 13 is automatically pinched by the pinch rollers 19 and 20. Note that the opening/closing lid 16 is fixed to the main body 12 by a lock screw 32 in the closed state.

An imaging lens 34 that forms an image of the image information of the document surface 11 on the surface of the electrophotographic photosensitive paper 13 located on the vertical wall of the charging/exposure guide plate 18 of the charging brush 21 and the pair of pinch rollers 19, 20. is fixed to a lens holder 36 formed inside a window plate 35, which will be described later, and a partition plate 37 formed on the main body 12 functions as a mask for regulating the imaging area. The document placement surface of the main body 12 located below the imaging lens 34, that is, the side facing the document surface 11, and the surface of the main body 12 located above the imaging lens 34, facing the document placement surface, respectively. Rectangular openings are formed into which transparent window plates 35, 38 are respectively fitted.

In this embodiment, positioning marks 39 indicating the copy area are drawn on the four corners of the window plate 38 on the document placement surface side. Therefore, when copying, the main body 12 is placed on the document surface 11 and the top While viewing the document surface 11 through the window plate 35, the main body 12 can be positioned at the desired copying area using the positioning marks 39. Note that if appropriate characters or symbols are drawn in advance in the copy area of the window plate 38 on the document placement surface side, or if they are appropriately displayed on a liquid crystal display device, etc., they can be displayed together with the image information on the document surface 11 in the electronic photograph. Since the light is exposed on the photosensitive paper 13, 1. It can be used to search for manuscripts that do not allow writing or as some kind of recorded information.

In this embodiment, in order to make the main body 12 more compact, the original surface 11 is scanned and the image information is exposed onto the electrophotographic paper 13. Therefore, the scanning speed of the original surface 11 and the electrophotographic paper 13 are The feeding speed is set to be the same as that of . A pair of mutually parallel side frames 40 are formed on both sides of the window plates 35 and 38 of the main body 12, and a first guide groove 41 extending parallel to the optical axis of the imaging lens 34 is formed in these side frames 40. and a second guide groove 42 are provided, respectively. A first slider 45 is engaged with the first guide groove 41 so as to be slidable on the first guide groove 41 via pins 43 and 44, and a first reflective optical system that is inclined with respect to the document surface 11 is connected to the first slider 45. A first mirror 46, which is a system, is fixed across the width direction of the first slider 45, and a lamp 47 for illuminating the document surface 11 is attached to the first slider 45. Note that a metal fitting 48 is attached to the pin 43 of the first slider 45.

A second varnish slider 51 is slidably attached to the second guide groove 42 via pins 49 and 50 on the second guide groove 42.
The pulley 52 is engaged with the pin 49 of the second varnish slider 51.
is rotatably mounted. This varnish slider 51
A second mirror 53 and a third mirror 54, which are a second reflecting optical system that guides the image information reflected by the first mirror 46 to the electrophotographic photosensitive paper 13 via the imaging lens 34, are connected to the width of the varnish slider 51. They are fixed in each direction.

On the other hand, small gears 55 are integrally provided on both ends of the drive pinch roller 19, and these small gears 55 are connected to rotating shafts 56 protruding from the main body 12 located at both ends of the paper roll shaft 14. and mesh with large gears 57 that are rotatably supported. These rotating shafts 56 have large gears 5
A drive pulley 58 is rotatably supported in parallel with 7. As shown in FIG. 8, which is an enlarged view of the large gear 57 and drive pulley 58, and FIG. 9, which shows the operating state thereof,
A convex portion 5 is provided on the surface of the canine gear 57 facing the drive pulley 58.
9 is formed, and a lever 60 is provided on the surface of the drive pulley 58 facing so as to have the same circumference as the convex portion 59 of the large gear 57.
is provided. The lever 60 is biased by a spring 61 so that one end projects toward the large gear 57 and the other end projects from the outer surface of the drive pulley 58 . That is, the convex portion 59 of the drive pulley 58 is a latch mechanism that can be locked by the lever 60 of the large gear 57, and the large gear 57 and the drive pulley 58 can rotate together. . In addition, the reference numeral 62 in the figure is a release plate fixed to the main body 12 side, and when the convex portion 59 and the lever 60 rotate in a locked state and the lever 60 comes to the position of this release plate 62, the lever is released. 60 is pushed by the release plate 62 against the spring 61, and the engagement between the convex portion 59 and the lever 60 is released.

One end of a wire 63 is fixed to the drive pulley 58,
The other end of this wire 63 is fixed to one end of the metal fitting 48. One end of another wire 64 is fixed to the other end of the metal fitting 48, and this wire 64 is wound around the pulley 52.
- and the other end is fixed to a pin 65 provided on the side frame 40. Therefore, the metal fitting 48 is connected to the first guide groove 4.
1, the pulley 52 will move along the second guide rail 42 by L/2,
From the first mirror 46 to the second mirror 53 and the third mirror 54
The length of the optical path to the imaging lens 34 is always constant no matter where the first slider 45 is in the first guide groove 41, and defocusing caused by the imaging lens 34 is prevented.

A spring catch 66 is formed on the second varnish slider 51, and a main body side spring catch 67 is provided at the end of the main body 12 opposite to the end where the paper roll shaft 14 is provided. A tension spring 68 is attached to these spring hooks 66 and the main body side spring hook 67.
The hook is passed, and the second varnish slider 51 is attached to this tension spring 68.
In FIG. 5, it is biased downward. Said large gear 5
7 and the lever 60 of the drive pulley 58 are such that when the varnish slider 51 is located at the scanning start portion shown in FIG.
7, the driving pulley 58 rotates together with the first mirror 46, the lamp 47, the second mirror 53, the third mirror 54, etc., and the scanning optical system scans the document surface 11.
6 and the lamp 47 scan to the end of scanning indicated by the two-dot chain line in FIGS. 1 and 4, the lever 60 releases the release plate 62.
It is set in such a position that it can be pressed by. In other words,
Electrophotographic paper 1 by a pair of pinch rollers 19 and 20
The first mirror 46 and ramp 47 are synchronized with the feed speed of 3.
When the varnish slider 51 scans the document surface 11 together with the first slider 45 and reaches the end of scanning, the varnish slider 51 releases the tension spring 68.
The first slider 45 is returned to the scanning start part by the spring force of
is quickly returned to the scanning start portion together with the varnish slider 51.

Further, at this time, the drive pulley 58 also rotates in the opposite direction by the amount rotated integrally with the large gear 57 due to the spring force of the tension spring 68.

In the above embodiment, the scanning optical system was driven by winding the wire 64 around the pulley 52, but it is also possible to use a combination of a sprocket and a chain, and the present invention is not limited to this. Further, electrophotographic paper 13 is used as a driving source.
Although the drive motor 25 for feeding is used in combination, an independent drive source may also be used as long as it can be synchronized with the feeding speed of the electrophotographic photosensitive paper 13. Furthermore, a first mirror 46, a second mirror 53, and a third mirror 5 are used as a reflective optical system.
4 was used, but it is not limited to mirrors, and other reflective optical systems such as prisms may be used.

A developing drum 69 is provided above the pair of pinch rollers 19 and 20 for developing an electrostatic latent image of image information on the document surface 11 formed on the electrophotographic photosensitive paper 13. FIG. 10 shows the appearance of this developing drum 69, and FIGS. 11 and 12 show the cross-sectional shape when it is used and when it is used as a stone.
As shown in the figure, the developing drum 69 is connected to the pinch roller 1.
A developer 70 rotates in conjunction with 9 and is stored inside.
The electrostatic latent image of the image information on the document surface 11 formed on the electrophotographic photosensitive paper 13 is developed with toner by causing it to ooze out onto the outer peripheral surface. That is, the developing drum 69 is removably held at both end surfaces by a pair of holding plates 71 and 72, and one of the holding plates 71 is engaged with a connecting concave-convex portion 73 formed on one end surface of the developing drum 569. The other holding plate 72 rotatably holds the developing driver 569. A gear 75 is integrally fitted into a shaft portion 74 protruding from one of the holding plates 71, and a small gear 55 that meshes with this gear 75 is integrally provided on the driving pinch roller 19.

Therefore, when the driving pinch roller 19 rotates and one of the holding plates 71 rotates due to the engagement of the small gear 55 and the gear 75, this rotation is transmitted to the developing drum 69 via the connecting uneven portion 73. That will happen. The numbers of teeth of the gear 75 and the small gear 55 are set so that the peripheral speed of the developing drum 69 and the driving pinch roller 19 at this time are equal.

As shown in FIG. 13, which shows an enlarged structure of the developing drum 69 corresponding to FIG. A shaft portion 74 protruding from the retaining plate 71 and a spline shaft portion 76 protruding from the retaining plate 72 are attached to the main body 12 so as to switch between a state in contact with the roller 19 and a state in which the roller 19 is not in contact. They are respectively fitted and supported at the tips of pivotally supported levers 77. That is, by rotating the lever 77, the holding plates 71, 72 and the developing drum 69 held therebetween are slightly moved up and down in FIG. 6, thereby switching between the contact state and the non-contact state. This switching operation is automatically performed in conjunction with the operation of the scanning optical system.

That is, since a torsion coil spring 78 is attached to the pivot portion of the lever 77, the lever 77 is urged to rotate downward in FIG. 4, and the developing drum 69 is pressed against the drive pinch roller 19. The state will be as follows. In this state, the lever 77 is in sliding contact with a groove 79 on the outer peripheral surface of a large gear 57 coaxial with the pair of knobs 56 shown in FIG. The small gear 55 meshes with the small gear 55. This big gear 5
The groove 79 on the outer peripheral surface of No. 7 functions as a cam with a shallow bottom at only one point in the circumferential direction, and therefore, the lever 77 that slides into this groove 79 only has a shallow bottom once during one revolution of the large gear 57. The developing drum 69 is rotated upward in FIG. 4, and the developing drum 69 is separated from the driving pinch roller 19. As mentioned above, the large gear 57 is linked to the operation of the scanning optical system via the drive pulley 58 by the clutch mechanism, so after the scanning optical system finishes scanning one screen, it returns to the scanning start position and resumes scanning again. Until then, the relative relationships among the large and small gears 55 and 57, the pulley 58, and the lever 77 are set so that the developing drum 69 and the pinch roller 19 are in a non-contact state.

On the other hand, the developing drum 69 has an inner cylinder 80 and an outer cylinder 8 each having end surfaces that are held between the holding plates 71 and 72 from both sides.
1 are slidably fitted together in the axial direction to store a developer 70, and an outer cylinder 81 has a coating layer 82 of nonwoven fabric, foamed urethane rubber, etc. on the outer peripheral surface.

A stopper 83 having a smaller diameter than the inner cylinder 80 is formed at the open end of the outer cylinder 81. A compression coil spring 84 is housed in the inner cylinder 80, and the end face of the inner cylinder 80 is fixed by the compression coil spring 84. is pressed against the stopper 83.

Since the inner cylinder 80 is set to have a slightly shorter axial length than the outer cylinder 81, the inner cylinder 80 resists the compression coil spring 84.
Can you move 0 by pushing it to the right in Figure 12? Each of the inner cylinder 80 and outer cylinder 71 is provided with a seepage hole 85, 86, and as shown in FIG.
5.86 are overlapped and connected, whereas
As shown in FIG. 12, when no external force is applied, each seepage hole 85, . 86 is shifted, and the developer 70 becomes sealed inside the developing drum 69. The developer 70 oozing out from the oozing holes 85 and 86 in the communicating state is applied to the coating layer 82.
The coating layer 82 becomes wet.

This coating layer can be made of a permeable material such as the nonwoven fabric mentioned above.

The developer 70 has positive or negative polarity, and contains a carrier liquid soluble component such as an electrodeposit, a dispersed polymer, or a charge control agent, in addition to a coloring agent and a toning agent. In addition, the outer cylinder 8
1 is made of a conductive material to allow bias current to flow.

A semi-cylindrical shutter 8 is rotatably supported by the main body near the developing drum 69 and shields the developing drum 69.
As shown in FIG. 6, a lever "89" is integrally fixed to one end of the 7 through a side plate 88. By operating this lever "89," as shown in FIG. 87 can be rotated around the developing drum 69 and retracted above the developing drum 69, or the shutter 87 can be rotated to close the developing drum 69 as shown in FIG.
and the drive pinch roll 19. Here, when the shutter 87 is opened as shown in FIG. 13, a lever 89 rotates an arm 90 pivotally connected to the main body 12 and pushes a limit switch 91, so that the main switch of the electric circuit is turned on. It has become.

Therefore, as shown in FIG. 14, the electric circuit does not operate when the shutter 87 is closed, thereby preventing malfunction of the device.

As shown in FIG. 6, the spline shaft 76 of the holding plate 72 passes through the other end surface 92 of the shutter 87, and the holding plate 72 is attached to the outer periphery of the spline shaft 76.
A compression coil spring 93 is attached to press against the other end surface 92 of 7. The spline shaft 76 is supported slidably in the axial direction with respect to the lever 77, and a cam mechanism is incorporated between the other end surface 92 of the shutter 87 and the holding plate 72.

As shown in Figure 15, which shows the disassembled state of this cam mechanism,
The cam mechanism of this embodiment includes an annular follower 94 fixed to the other end surface 92 of the shutter 87 and an annular end cam 95 fixed to the holding plate 72. The cam curve of this end cam 95 has a step 97 formed at the deepest part of the slope 96 and a small step 98 formed at the shallowest part of the slope 96. A protrusion 99 is formed that comes into sliding contact with the surface 96.

Therefore, when the shutter 87 is rotated as shown in FIG.
When rotating as shown in FIG.
moves to the left in FIG. 6, and as shown in FIG. 11, the inner cylinder 80 of the developing drum 69 is pushed in, and the developer 70 oozes out.

Above the developing drum 69 is a semi-cylindrical opening/closing lid 100.
is pivotally supported on the main body 12 so as to be able to open and close freely, and in FIG.
As shown by the two-dot chain line, the opening/closing lid 100 can be opened to replace the developing drum 69. A cutter 101 is attached to the tip of the opening/closing lid 100, and a photosensitive paper outlet 102 is provided between the cutter 101 and the main body 12.
A gap is formed. This photosensitive paper outlet 10
2 and the drive pinch roll 19 is a guide plate 10.
3 is provided.

Therefore, the electrophotographic photosensitive paper 13 sandwiched between the driving pinch roll 19 and the developing drum 69 comes into close contact with the coating layer 82 of the developing drum 69, and after the electrostatic latent image is developed with toner by the developer 70, The photosensitive paper is guided by a guide plate 103 and fed out of the main body 12 from the outlet 102, and the cutter 1
01 allows manual cutting.

In this embodiment, the structure of the developing drum 69 is such that the inner cylinder 80 and the outer cylinder 81 are slid in the axial direction to switch between a state in which the oozing portion 685°86 is in communication and a state in which it is blocked. However, the structure is not limited to this, and for example, a structure in which the seepage hole can be switched between a state in which it is communicated and a state in which it is blocked by sliding the inner cylinder and the outer cylinder in the circumferential direction. may be adopted. Furthermore, the opening and closing of the shutter 87 is not limited to a structure that utilizes rotational motion.
It is also possible to create a structure that utilizes linear motion.

During actual copying work, place the main body 12 at a predetermined position on the original surface 11, or press the main body 12 against the original surface 11 if the original surface 11 is tilted or vertical, and then press the lever. 89 to flip up the shutter 87 from between the driving pinch roller 19 and the developing drum 69,
Press the copy switch 104. As a result, the drive morph 25 is activated, and the electrophotographic photosensitive paper 13 charged by the charging brush 21 is sent to the developing drum 69 side. 13 is continuously exposed through the scanning optical system. Then, while passing through the developing drum 69, the electrostatic latent image of the image information is developed, and the photosensitive paper feed port 1
02 to the outside of the main body 12. Then, as shown in FIG. 4, a switch 105 attached to the main body 12 comes into contact with a dog 106 protruding from the large gear 57, and all operations are stopped by detecting one rotation of the large gear 57. After that, the developed electrophotographic photosensitive paper 13 drawn out from the photosensitive paper outlet 1 is cut by the cutter 101. In this case, there is a margin at the front end and rear end of the separated electrophotographic paper 13 where no image information is copied, so the margin can be used as a record memo or the like.

Note that when carrying the device, it is preferable to operate the lever 89 to move the shutter 87 under the developing drum 69 in order to prevent the developer 70 from evaporating from the coating layer 82.

<Effects of the Invention> According to the compact electrophotographic copying apparatus of the present invention, since image information is directly exposed to the electrophotographic paper and the electrophotographic paper is charged with a brush, a high voltage is not applied to the charging brush. This makes it possible to significantly reduce the amount of power consumed in combination with the fact that there is no need for a transfer device or a fixing device, and it is possible to use a battery as a power source.

In addition, since the developing drum controls the amount of developer that oozes out, it is possible to prevent the developer from evaporating, and there is no problem even if the entire device is tilted, so it can be carried freely and Copying work can be performed even on the original surface or perpendicular original surface.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing the internal structure of an embodiment of a small-sized electrophotographic copying device according to the present invention, FIG. 2 is a perspective view showing the overall appearance, and FIG. 3 is a mechanism of the opening/closing lid portion. Fig. 4 is a conceptual diagram of the mechanism representing the drive mechanism of the movable part corresponding to Fig. 1, Fig. 5 is its plan view, Fig. 6 is a right side view of Fig. 4, Fig. 7 is a bottom view of the device of this embodiment, No. 8
9 and 9 are operational conceptual diagrams of the quick return mechanism incorporated in the scanning optical system, FIG. 10 is a perspective view of the developing drum, and FIG. 11 is a sectional view showing the state of the developing drum during copying work. , Fig. 12 is a sectional view showing the state of the developing drum when not in use, Fig. 13 is an enlarged sectional view showing the developing drum part in Fig. 1, and Fig. 14 is a sectional view showing the developing drum when not in use. FIG. 15 is an exploded perspective view of the cam mechanism incorporated in the developing drum. Also, in the figure, 11 is the document surface, 12 is the main body, 13 is electrophotographic paper, 19.20 is a pinch roller, 21 is a charging brush, 22 is a battery power supply, 25 is a drive motor,
34 is an imaging lens, 35° 38 is a window plate, 45, 51 is a slider, 46, 53° 54 is a mirror, 47 is a lamp, 5
2, 58 are pulleys, 55, 57, 75 are gears, 63, 6
4 is a wire, 68.84 is a spring, 69 is a developing drum, 7
0 is a developer, 80 is an inner cylinder, 81 is an outer cylinder, 82 is a coating layer,
Reference numerals 85 and 86 indicate a seepage hole, 87 a shutter, 89 a lever, 101 a cutter, 102 a photosensitive paper outlet, and 104 a copy switch.

Claims (1)

[Claims] A main body in which a roll of electrophotographic paper is rotatably stored and placed on the document surface, and a main body that holds the electrophotographic paper and is rotatably attached to the main body, a pair of pinch rollers for feeding out the photosensitive paper; a charging brush attached to the main body so as to be in sliding contact with the electrophotographic paper and electrostatically charging the electrophotographic paper; and a charging brush for moving the electrostatically charged electrophotographic paper. a scanning optical system that scans the document surface and projects image information of the document surface onto the electrophotographic photosensitive paper to form an electrostatic latent image; and a pair of pinch rollers that are attached to the main body. A small electrophotographic copying apparatus comprising a developing drum that rotates in conjunction with the developing drum and stores therein a developer that oozes out onto the outer circumferential surface and develops an electrostatic latent image formed on the electrophotographic photosensitive paper with toner.