JPS6199129A - Optical device for exposure - Google Patents

Abstract

PURPOSE:To cool an original setting surface and an exposing light source effectively with a simple constitution by forming a separating means so that a cooling air passage is formed along the original setting surface. CONSTITUTION:A shielding member 65 to be used also as a lens cover is formed so as to cover the upper surface of a lens unit 54 and an optical unit 60 and a shielding member 66 is formed on an optical unit 57 so that a part of the member 66 is superposed to the member 65. The separating means 68 for forming the cooling air passage 67 along the original setting surface 5a is formed on the upper surface side of the shielding members 65, 66. Air led from the right side part of a copying machine body 4 into the passage 67 by an exhaust fan 71 is guided so as to be passed up to the left side part along the lower surface side of a picture board glass 5 by the shielding members 65, 66 and then exhausted to the outside.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention is applied, for example, to a copying machine, etc., and includes an exposure light source that irradiates light onto a document placement surface and a device that reflects reflected light from the document placement surface in a predetermined direction. a first optical unit that has a reflective member that moves along the document placement surface;
The optical unit moves at a speed of 1/2 and has a reflecting member that reflects the optical image reflected by the first optical unit toward the lens side, and scans the original placed on the original placing surface. The present invention relates to an improvement in an exposure optical device that forms an image on an exposed portion.

[Technical background of the invention and its problems]

A fixed document copying machine has an exposure light source that irradiates light onto the document placement surface and a reflecting member that reflects light reflected from the document placement surface in a predetermined direction, and moves along the document placement surface. A first optical unit moves in the same direction in synchronization with the first optical unit at a speed that is half the speed of the first optical unit, and reflects an optical image by the first optical unit. The second optical unit includes a second optical unit having a reflective member that reflects light toward the lens side, and is configured to scan a document placed on a document placement surface and form an image on the exposed portion.

) However, in the conventional exposure optical apparatus, only a lens cover is provided, and the movement of the first optical unit having a reflection member that reflects light reflected from the exposure light source and the document placement surface in a predetermined direction is difficult. The lower side of the road is open.

Therefore, cooling air does not flow over the entire document placement surface, causing problems such as the document placement surface becoming hot and causing the operator to feel uneasy, and the light source becoming overheated and shortening its lifespan. . Another problem is that stray light leaking from the light source directly enters the lens, giving an image formation effect.

[Purpose of the invention]

The present invention has been made based on the above circumstances, and its purpose is to provide sufficient cooling of the document placement surface and the exposure light source, while having a fairly simple configuration, and to prevent stray light. The present invention aims to provide an exposure optical device that can reliably prevent adverse effects.

[Summary of the invention]

In order to achieve the above object, the present invention includes an exposure light source that irradiates light onto a document placement surface and a reflection member that reflects reflected light from the document placement surface in a predetermined direction, a first optical unit that moves, and one-half the speed of the first optical unit in synchronization and in the same direction as the first optical unit;
and a second optical unit having a reflecting member that reflects the optical image reflected by the first optical unit toward the lens side, and scans an original placed on an original placing surface. image on the exposed area.

In the exposure optical apparatus, a first shielding member provided to cover the lens and a second shielding member attached to the second optical unit and movable with a part overlapping the first shielding member are provided. The apparatus has two damping members, and is provided with a partitioning means for partitioning the document placement surface to form a cooling air conduction path.

(Embodiment of the Invention) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the external appearance of an image forming unit device employing the exposure optical device of the present invention, and FIG. 2 is a schematic longitudinal sectional front view thereof.

In the figure, 1 is a copying device as an image forming device, and 2 also serves as a mounting table on which the copying device 1 is placed, and the paper P as an image recording medium discharged from the discharge section of the copying device 1 is stored as necessary. This is a direction changing/conveying device that receives the paper P and guides it to the copying apparatus 1 again in the same state or in a reversed state in order to form multiple or double-sided images on the paper P. Reference numeral 3 denotes an automatic document feeder which is mounted on the top surface of the copying machine 1 and automatically supplies the document A. The copying machine 1 is constructed as shown in FIG.

That is, in the figure, 4 is a main body of the copying machine, and on the top surface of the main body 4 of the copying machine, there is provided a document placement glass 5 as a document placement section on which a document sent by the automatic document feeder 3 is placed. In addition, an operation panel 6, which will be described later in FIG.
tt and s are installed. Further, the upper paper feed cassette 70 and the cassette cover 10 serve as a manual paper feed table 11 for manually feeding paper P as appropriate.

A drum-shaped photoreceptor 12 is arranged approximately in the center of the main body 4 of the copying apparatus. A charging device 1 is provided around the photoreceptor 12.
3. Exposure optical device 14, dichromatic power 2-developing device 1 to be described later
5, a transfer device 16, a peeling device 17, a cleaning device 18, and an afterimage erasing device 19 are arranged in this order.

In addition, paper feed cassettes 7, 8, .
Paper 2 fed from the automatic paper feeder 2o equipped with 9
1. The paper P1 manually fed from the manual paper feed table 11 and the paper P1 fed from the direction conversion conveyance device 2 are transferred to the main body of the copying machine via the image transfer section 2 between the photoreceptor 12 and the transfer device 16. The discharge part 2 provided on the left side of 4
A paper conveyance path 23 leading to the paper sheet 2 is formed.

Further, a pair of aligning rollers 24 is arranged on the upstream side of the image transfer section 21 of the paper transport path 23, and a fixing device 25 and a pair of paper ejection rollers 26 are arranged on the downstream side.

Further, the operation panel 6 has a K shape as shown in FIG.

That is, on the right end side of the operation panel 6, there is a start button 30,
Three numeric keys, a total counter 72 are arranged, and on the left end side, a mode switching button 33, a single-sided copy mode display LED 34, a double-sided copy mode display LED 35, a double copy mode display LED 36, a density adjustment button 37,
An automatic exposure button 38 and a first display section 39 are arranged. Further, in the center part, a reduced display section 40, a same-size display section 41, an enlarged display section 42, a variable magnification button 43, a zoom button 44, a color specification button 45, and a second display section 46 for displaying the status are arranged. The situation is as follows.

Further, as shown in FIGS. 5 and 6, the exposure optical device gt14 has an exposure light source 2 whose back part is surrounded by a reflector 50 and which irradiates light onto the document placement surface 5a.
The mirror 51, which reflects the reflected light from the document placement surface 5a in a predetermined direction, can move along the surface 5a. 1st
optical unit! 53, the light travels in the same direction in synchronization with this first optical unit 53 at a speed of 1/2 of the speed of 1 degree of the first optical unit 53, and is reflected by the first optical unit 53. A second optical unit 57 having a second mirror 55 and a third mirror 66 that reflect the image toward the lens unit 54 is provided. Furthermore, a fourth mirror 5 as a reflecting member is provided at the rear stage of the lens unit 54.
8. Third optical unit 6 (7) having a fifth mirror 59
The configuration includes a sixth mirror 61 as a fixed reflecting member that reflects the optical image reflected by the third optical unit 60 toward the photoreceptor 12 side.

Note that 62 is a dustproof glass provided between the sixth mirror 61 and the photoreceptor 1°2, and 63 is a heat ray absorbing glass provided in front of the exposure lamp 51.

Thus, with the exposure lamp 5) turned on, the first optical unit 53 moves at a speed V along the document placement surface 5a, and in synchronization with this movement, the second optical unit 57 moves.
moves in the same direction at a speed that is half the speed V, thereby scanning the original placed on the original placing surface 5a, on the photoreceptor 12 as a pre-rotating presentation part. It is designed to form an image.

Then, the photoreceptor 1 is charged at once by the charging device 13.
An electrostatic latent image corresponding to the document A is formed on the document A.

The electrostatic latent image formed in this manner is developed by facing the developing device 15, and then sent to the image transfer section 21 facing the transfer device 16, and the developer image is formed by the aligning roller pair 24t- It is transferred to the 76 p that was sent through. Next, the paper P on which the image has been transferred is peeled off from the photoreceptor 12 by a peeling device 17, and then transferred to a conveyance path 23.
The sheet is guided to a fixing device 25 through which the image is fixed, and is discharged to a discharge section via a pair of discharge rollers 26.

On the other hand, the surface of the photoreceptor 12 after the developer image has been transferred to the paper P faces a cleaning device 18 to clean residual developer (toner) remaining on the photoreceptor 12, and then an afterimage erasing device 19, the intensity on the photoreceptor 12 is lowered below a certain level to enable the next copying operation.

Further, as will be described later, the lens unit 54 and two mirrors 58.5 arranged at an angle of 90 degrees
A third optical unit 60 having a lens 9 can be moved as shown by arrows A and B in FIG. The structure is as follows.

Further, as shown in FIGS. 3 and 6, a first shielding member 65 that also serves as a lens cover is provided to cover the upper surfaces of the lens unit 54 and the third optical unit 60, and The unit 57 includes a first shielding member 6
A second shielding member 66 is provided to partially overlap the upper surface of the shielding member 65, and a partitioning means 68 is provided on the upper surface side of these shielding members 65 and 66 to form a cooling air passage 67 along the document placement surface 5a. It consists of

When the second shielding member 66 is not attached, the end side of the second shielding member 66 is attached to the first shielding member 66 via a supporting means 69 consisting of a roller or a sliding member. It is designed to be guided on the shielding member 65, and is a trap so that no special guide means is required.

Further, the first optical unit 57, the lens unit 5
4 and the third optical unit 6° are covered with a partition plate 70 that partially holds the dustproof glass 62, and one end of this partition plate 7o is connected to the exhaust fan 71. 7 is connected to the uncasing 72, and substantially partitions the copying apparatus main body 4 into upper and lower sections.

As shown by the arrow in FIG. After being guided by the member 65 and the second rattan shielding member 66 to ensure that it passes along the lower surface side of the image stage glass 5 to the left side surface, it is discharged to the outside. Therefore, the exposure lamp 5 can be sufficiently cooled, the exposure lamp 51 can be prevented from overheating and its life can be extended, and the adverse effects of heat on other parts can be prevented as much as possible. Further, heating is prevented over the entire area of the document table 5, so that the operator does not feel uneasy. In addition, the second shielding member 66
The stray light shown in is blocked, and the stray light is transmitted to the lens unit 5.
It is possible to reliably prevent image defects caused by the condition 4.

Further, the first optical unit 53 and the second optical unit 57 are mounted and supported as shown in FIG. is configured to be able to move at half the speed V.

That is, the upper horizontal piece 7 is provided on the mutually opposing surfaces of the rear frame 75 and the front frame 76 which are arranged in parallel at a distance.
Guide frames 77.77 are attached parallel to the guide frames 5a and 76a, and sliders 78 attached to the lower surfaces of both ends of the guide frames 77.77 are in sliding contact with the first optical unit 53, In this way, the first optical unit 53 and the second optical unit 57, which are provided movably on the guide frame 77. is moved in a predetermined direction at a predetermined speed.

The optical unit operating means 79 has the following configuration. That is, a drive shaft 80 is horizontally mounted corresponding to one end of the optical unit 53.57 in the moving direction, and drive pulleys 81.81 are attached to both ends of the drive shaft 80, that is, to the outside of both frames 75.76. . Further, a driven pulley 82 is rotatably provided on the outside of the frame 75.76 via a support shaft 83 corresponding to the other end in the moving direction of the optical unit 53.57.

On the other hand, both ends of the carriage 84 of the first optical unit 53 protrude outside the frame 75, 76.
Both ends of the carriage 85 of the second optical unit 57 have pulley attachment parts 85a and 85b that are vertically folded back along the outer surface of the frame 75.76, and a pair of boots 1) g that function as movable pulleys. e and 87 are each attached.

Further, a midway portion of a wire 88 is wrapped around each pulley 81, 82, 86, 87 in a predetermined state. That is, the wire 88 whose one end is fixed to the fixture 90 via the spring 89 is pulled out to the driven pulley 82 side, wrapped around the first pulleys 8 and 6 of the second optical unit 57 and folded back, and then attached to the drive pulley 81. The driven pulley 82 is wrapped around the driven pulley 82 several times.
Fold back to the side. Then connect the wire 8 to the driven pulley 82.
8 to the second pulley 87 of the second optical unit 57.
After it is folded back with a spring, the other end is fixed to a fixture 92 via a guide 91.

Further, both ends of the carriage 84 of the first optical unit 53 are directly fixed to a wire 88.

On the other hand, the drive @80 is interlocked via a pulse motor 93 and a timing belt 94, so that the drive pulleys 81, 61 around which the wire 88 is wound are driven in the forward or reverse direction. There is. The first optical unit 53, which is directly fixed to the wire 88, has a speed of V, and the second optical unit to which the wire 88 is attached and which acts like a movable pulley is attached. 57 is configured to move at half the speed V.

Further, as shown in FIG. 8, a pair of pulleys 86 and 8 are respectively attached to both ends of the second optical unit 57.
7 are attached to support shafts 95 and 96 that are arranged independently on a line parallel to the direction of movement of the optical unit 57, that is, in a direction along the tension direction of the wire 88. ) □ so that a stable support state can be maintained for a long period of time without applying a moment in the direction perpendicular to the direction and without generating vibration.

Note that 97 is a connection reinforcing member that connects the free end sides of support shafts 95 and 96 that rotatably support the pulleys 86 and 87.

Furthermore, in order to change the copying magnification as described above, a third optical unit (6) comprising a lens unit 54 and two mirrors (58, 59) arranged at a 90 degree angle is required.
o by a predetermined amount, that is, for example, the focal length f is 2.
When using a 10 JEl lens, it is necessary to move it approximately as shown in the table below.

The 1/lens unit 54 and the third optical unit 60 are supported (as shown in FIG. 9), so that the lens unit 54 can be moved and the amount of movement is smaller than that of this lens unit 54. In this state, the third optical unit 60 is made movable so that a predetermined copying magnification can be obtained.

That is, a pair of screw shafts 100 and 101 are rotatably installed in parallel across the movement path of each unit 54 and 60, and these screw shafts zo
The third optical unit 60 is slidably supported by externally fitting slide bushes 103 attached to both ends of the carriage 1020 onto the third optical unit 60 and 101.

Further, a spiral housing 104 is disposed at one end of the carriage 102 and is engaged with the screw shaft 101.
is attached, and as the screw shaft 10 rotates forward and backward, the third optical unit 60 reciprocates with the screw shaft 101° 100 as a guide. The driving force of the pulse motor 105 is transmitted through a set of gears 106 and 107.

On the other hand, one end of the carriage 108 of the lens unit 54 is held by the screw shirt 'p100 via slide bushes 120, 120, and the other end is attached to the lower surface of the carriage 108, and the nine slider 121 is attached to the carriage of the third optical unit 60. By placing it directly on 102, it is supported in a slidable manner.

Further, a spiral housing 122 is disposed at one end of the carriage 108 and engaged with the screw shaft 100.
is attached, and is configured to reciprocate as the screw shaft 100 rotates in forward and reverse directions.

The screw shaft 100 is a lens! The driving force of the dynamic pulse motor 105 is transmitted through a set of gears 124 and 125.

Accordingly, as the mirror and drive pulse Tanabata 105 rotates forward and backward, the third optical unit 60 moves a predetermined distance in a predetermined direction, and as the lens drive pulse motor 123 rotates forward and backward, the L/lens The unit 51 moves by a predetermined distance in a predetermined direction. At this time, the mirror drive pulse motor 105 and the lens drive pulse motor 123
By changing the period of the drive pulse of the lens unit 54, the amount of movement per simple time of the third optical unit 60, which requires less movement than the lens unit 54, can be changed.
It is in a state where it is set smaller than the movement amount of 4.

The ζ lens unit 60 and the third optical unit 54
Since the change in focus and magnification for the same amount of movement is greater in the third optical unit 54, the third optical unit 54 is moved slowly so as not to have an adverse effect on the power of view, and a higher t lit K can be obtained. The developing device 15 is the 10th developing device 15.
The configuration is as shown in FIG. That is, as shown in FIG. 10, a developing roller 1301 as a first developing body and a developing roller 13 as a second developing body
1, and by selectively driving these developing rollers 130° and 131, it is possible to develop, for example, black or red.

Further, the developing device 4 includes a first developing roller 130 .
The first developing unit 132 in the upper stage uses red developer Da, which is used less frequently, and the second developing unit 133 includes the second developing roller 131. The second developing unit 133 uses black developer Db, which is frequently used. Note that the developers Da and Db are two-component developers consisting of toner and carrier.

The first developing unit 132 that uses the red developer na is composed of a developing mechanism section 134 and a developer stirring section 135, as shown in FIGS. A doctor 137 is provided at the sliding contact portion of the developer magnetic brush Da' formed on the surface of the roller 130 with the photoreceptor 12, that is, upstream of the development position 136, and regulates the thickness of the developer magnetic brush Da'; A developing roller 130 is provided downstream of the developing position 1.36.
A casing 141 houses a scraper 139 that scrapes off the developer magnetic brush Da' on the surface of the developer storage section 138 and guides it to the developer storage section 138, and developer stirring bodies 140, 140 accommodated in the developer storage section 138. It has become.

Further, the first developing roller 130 includes a magnetic roll 142 and a sleeve 143 fitted around the magnetic roll 142. The magnetic roll 142 has five magnetic pole parts 144a to 1
44e, 1st degree, 3rd degree. Fifth magnetic pole part 144a,'
144c and 144e are N poles; Fourth magnetic pole part 144
b, 144d are S poles, and each magnetic pole part 144a~
144e is arranged at an angle of about 50° to 70'', and the third magnetic pole part 144c facing the development position is arranged at an angle of about 700 to 100''.
0 Gauss, other magnetic pole parts 144a, 144b, 144d.

144e has a magnetic force distribution of 300 to 600 gax.

Therefore, in this first developing unit 132,
The rotating sleeve 143 is in a so-called "against mode" in which it is rotated clockwise to develop the image, and the developer brush Da' held on its surface is brought into sliding contact in a direction opposite to the flow of the image on the photoreceptor 12. Accordingly, the photoreceptor 12
The electrostatic latent image formed on the image is developed. Therefore, by reducing the diameter of the developing loan 13θ, the space from the exposure position to the transfer position is reduced as much as possible, thereby making the copying machine smaller.

In the present invention, since the diameter of the photoreceptor 12 is 78 circles, there are only about 122 circumferences from the exposure position to the transfer position.

In order to widen the distance between the development position, that is, the exposure position and the transfer position, the charging device 13 and the cleaning device 18 must be made smaller, but there is a limit to this.

For the above reasons, the inventors of the present invention have already confirmed that it is possible to install a developing device in which the diameter of the developing roller 130 is 40 mm or less in terms of space. Also, first developing unit 132, second developing unit)7. ? ,? It has been confirmed that the height of the drum must be 120 mm or less if the drum diameter is 78 m. That is, 1st. It must be made thinner together with the second developing units 132 and 133. For this reason, an against mode developing device is often used, which is advantageous in terms of space in the height direction, has a small number of poles, and is inexpensive in cost. In particular, in the first developing unit 132 installed at the top, the developing device opening faces downward, so in the with mode where the developer Da flows from the top to the bottom, problems such as ζ dripping of the developer Da occur. occurs. In this respect as well, the first developing unit 13
2, the against mode is advantageous.

Further, in the first developing unit 132, the developer magnetic brush Da' on the rotating sleeve 143 is removed by a developer removing means 145. As shown in the twelfth factor, this developer removing means 145 simply moves the rotating sleeve 143 in the opposite direction (counterclockwise direction) to that during development.
This is an extremely simple and inexpensive method of removing the particles by rotating them.

The rotating sleeve 143 rotates in the opposite direction when copying is completed, and the developer Da is conveyed in the opposite direction. Therefore, all of the upper developer Da of the rotating sleeve 143 is transferred to the doctor blade 137 and the scraper as shown in FIG. It is accumulated between 139 and 139.

In addition, when the magnetic lotus part has five poles, the farther apart the first magnetic pole part (carrying pole) 144a and the fifth magnetic pole part (carrying pole) 144e are, the higher the efficiency is <'fA of the image agent Da. Since conveyance and non-conveyance can be controlled, the number of poles is preferably 5 or less.

The scraper 139 also has a rotary sleeve 14 at its tip. ? An elastic thin plate member (not shown) such as Mylar (trade name) is attached in contact with the developer Da to further enhance the effect of preventing the developer Da from being fed in reverse.

Further, the reverse rotation operation of the rotating sleeve 143, that is, the removal operation of the developer magnetic brush Da is performed not only after the development operation is completed (after the copy operation is completed) but also after the apparatus is inadvertently stopped. In other words, when the power is turned off or the device suddenly stops due to a paper jam, etc., the optical system of the exposure optical device 14 is then turned on, the paper jam is removed, etc. At the same time as returning to the initial state, reversal is performed again. The configuration is such that the developer Da does not exist on the rotating sleeve 143 at least in the vicinity of the developing position 136 during the [copy possible] state, that is, during the resolving period.

Note that if the rotating sleeve 143 is small, with a diameter of about 40 RK or less and a width of about 230 RK or less, the above-mentioned rotating sleeve In addition to changing the rotational direction of the magnetic roll 143, the magnetic roll 142 can also be rotated via a drive source such as a solenoid so that the first magnetic pole part 144m faces the doctor blade 137 made of a non-magnetic member. It is possible.

Further, the second developing unit 133 that uses the black developer Db is composed of a developing mechanism section 146 and a developer stirring section 147, as shown in the glB diagram and FIG. A doctor 149 is provided at the sliding contact portion of the developer magnetic brush Db' formed on the surface of the developer magnetic brush Db' with the photoconductor 12, that is, on the upstream side of the development position 148, and regulates the thickness of the developer magnetic brush Db'. The developer Db scraped off by 149 is transferred to developer storage section 1
50 and a developer stirring body 152 housed in the developer storage section 150 are housed in a casing 153.

The developing roller 131 is composed of a magnetic roll 154 and a rotating sleeve 155 that is fitted around the magnetic roll 154 and rotates counterclockwise in the figure.

In the second developing unit 133, the developing roller 131 is made larger than the first developing roller 30 in order to enable high-speed development, and the rotating sleeve 155 is made larger than the first developing roller 30.
This is a so-called quiz mode in which the image is developed by rotating it counterclockwise in the figure.By sliding the developer brush Da' held on the surface of the photoreceptor 12 in a direction that follows the flow of the image on the photoreceptor 12, A sufficient development time is ensured, and the electrostatic latent image formed on the photoreceptor 12 is developed in a high quality image state.

The magnetic roll 154 has six magnetic pole parts 156a to 156f, which is one more than the Ml developing roller 30 described above, so as to be suitable for the with mode. 4th. Sixth magnetic pole portions 156b, 156rl.

156f is the N pole, the 1st. Third. fifth magnetic pole part 156a,
156e and 156m are S poles, and each magnetic pole part 15
61-156f are arranged at an angle of about 50° to 60°,
The fourth magnetic pole portion 156d facing the development position is SOO~1
000 GAX, other magnetic pole parts 156m, 156b, 156
c, 156*, and 1561 have a magnetic force distribution of 400 to 600 Gauss.

Further, in the second developing unit 133, the developer magnetic brush Db' on the rotating sleeve 155 is removed by a developer removing means 157.

As shown in FIGS. 13 and 14, the developer removing means 57 is comprised of a blade 158 made of an elastic member such as tefuretane rubber, and a blade moving mechanism 159 that moves this blade 158 in the horizontal direction. By pressing the blade 158 against the surface of the developer Db, the developer Db is prevented from being conveyed to the development position 148.

The blade moving mechanism 159 has a configuration in which a pinion 164 driven by a motor 163 is engaged with a rack 162 provided on a slider 161 integrated with a blade holder 160.Then, the motor 163 is moved in the forward direction.
By rotating the slider 16 in the opposite direction, the slider 16 is advanced or retreated, and the plaid 158 is brought into contact with the surface of the photoreceptor 12 as shown in FIG. 14, or separated from the surface of the photoreceptor 12 as shown in FIG. It has become.

Further, the position of the first plaid 158 in pressure contact with the photoconductor 12 exists between the position of the doctor plaid 149 and the second magnetic pole portion (conveyance 'W) lscb. This is because the position of the second transport pole 156b is most efficient for scraping off the developer brush Db', but if the interval is widened, the position of the second transport pole 156b is the most efficient for scraping off the developer brush Db'.

Since the amount of developer Db accumulated between the lid blade 149 increases, the developer sludge Db accumulated during this time may be scraped off as the photoreceptor 12 rotates and contaminate the inside of the machine. Therefore, the pressure contact position of the blade 158 is the developer D.
The position where there is less accumulation of b and where scraping is performed efficiently, that is, the doctor blade 149 and the second magnetic pole part 1
56b.

Note that 166 and 167 are position detectors that detect the forward and backward positions of the slider 161, and these detection signals are used to stop the motor 163.

After copying is completed, the blade 158 touches the photoreceptor 12 immediately before the rotating sleeve 155 stops, as shown in FIG.
After that, the rotating sleeve 155 makes more than half a turn and stops, and then the blade 158 separates from the rotating sleeve 155 as shown in FIG. Therefore, at least the developer Db on the rotating sleeve 155 at the developing position is removed.

Further, the contact operation of the blade 158, that is, the removal operation of the developer magnetic brush Db is performed by the first developing unit 1 described above.
As in the case of 32, this is performed not only after the development operation is completed (after the copy operation is completed), but also after the apparatus is inadvertently stopped. In other words, if the power is turned off or the device suddenly stops due to a paper jam, etc., then the power is turned on again.
At the same time that the optical system of the exposure optical device 14 is restored to its initial state by taking measures such as removing a paper jam, the blade 1 is turned on again.
58 contact operations are performed. The structure is such that in the [copyable] state, that is, during the resolving period, there is always no developer Db' on the rotating sleeve 155 at least in the vicinity of the developing position 148.

Moreover, the first. The second developing units 132 and 133 are configured to operate selectively in response to designations from a color designation section (not shown). That is, when red is specified, the first developing unit 1 is
The magnetic brush Da is formed only on the rotating sleeve 143 of the second developing unit 133, and when black is specified, the rotating sleeve 155 of the second developing unit 133 is formed as shown in FIG.
A magnetic brush Db is formed only on the top.

When the first developing unit 132@ is designated to be operated, the rotating sleeve 143 of the first developing row 2130 rotates clockwise as shown in FIG.
A developer magnetic brush Da is formed on the surface of the rotating sleeve 1430.

Then, the electrostatic latent image previously formed on the photoreceptor 12 is developed with the red developer Da.

When the development of this electrostatic latent image is completed, the developer removing means 145 operates as described above, and the rotating sleeve 143
rotates in the opposite direction, and at least the developer Da at the developing position 136 is removed in preparation for the next developing operation. In addition,
At this time, the second developing unit 1330 rotating sleeve 15
54 is also not provided with a developer magnetic brush Dh', so that problems such as color mixing will not occur even if either of the developing units 132, 133 is designated next.

Further, when the second developing unit 133 side is designated to be operated, the rotating sleeve 155 of the second developing roller 131 rotates counterclockwise as shown in FIG. A magnetic brush Db is formed. In order to cope with high-speed copying, the electrostatic latent image formed in advance on the photoreceptor 12, whose rotation is controlled at a higher speed than during development by the first developing unit 132, is transferred to the black developer D.
It will be developed in step b.

When the development of this electrostatic latent image is completed, the developer removing means 157 operates as described above, and the rotating sleeve 155
The blade 158 is in pressure contact with the 0 surface, and at least the developer Db at the development position 148 is removed in preparation for the next development operation.
320 rotating sleeve 143 also has a developer magnetic plan Da.
' is not formed, then one of the developing units 132,
Even if 133 is specified, problems such as color mixing will not occur.

The image quality of color copies is improved by increasing the printing speed for black copies and decreasing it for color (red) copies.

Therefore, at the time of black copying, that is, during development in the second development unit 133, the peripheral speed of the drum-shaped photoreceptor 120 is 22.
3 ore/8.35 sheets/min, A4 When color copying is performed horizontally, that is, during development in the first developing unit 132, the peripheral speed of the drum-shaped photoreceptor 12 is 136 + y, /8, 2
5/min, variable to A4 horizontal speed, developing roller 13
The diameter of 0 is 38mm compared to 50mm of the second developing row 5131.
It is as small as 1XJl, and high-quality color images can be obtained by ensuring sufficient development time. Furthermore, black copy, which is frequently used, enables high-speed copying.

Further, each developing unit 132 configured as described above,
133 has a front cover 17 as shown in FIG.
Developer receiving and conveying sections 132a and 133a protrude to be exposed by opening 0, and these developer receiving and conveying sections 132a, I;? A cartridge type developer replenishing device 171, 1 is connected to 3a.
72 are detachably attached. Developer empty detectors 173 and 174 (see FIG. 3) detect the amount of developer (toner*>) in the developer storage portions 138 and 150.
The amount of developer D commensurate with the consumption amount is determined by the detection signal from
The configuration is such that a and Db are replenished as appropriate.

i The developer replenishing device 172 on the second developing unit 133 side is configured as shown in FIGS. 18 to 20. That is, 175 is a container for storing the developer Da, and a transfer screw 176 that is rotationally driven to transfer the developer Db in the axial direction is housed at the bottom of the container 175. .

Further, a developer receiving and conveying section 133 is located at the lower part of one end of the conveying screw 176 of the container 175 located in the developer conveying direction. A holder 17 as a mounted part connected to the holder 17
A fitting protrusion 175a is formed that can be freely inserted into and removed from 7. A developer discharge port 178 for discharging the developer Db transferred by the transfer screw 176 is formed on the lower surface side of the fitting protrusion 175a.

Furthermore, the holder 177 is connected to the developer receiving and conveying section 133.
It is rotatably attached to the upper surface side of a, and a replenishment port 179 is formed on the bottom surface thereof corresponding to the developer transport shaft (toner auger) 182 of the developer receiving and transporting section 133. The situation is as follows.

Further, one end of the transfer screw 176 has the holder 1
It has a connecting portion 176a that protrudes from the end face of the drive device 77 and connects to the drive coupling 181 of the drive device 180.

A developer discharge port 17 is provided on the lower surface side of the fitting protrusion 125a.
sfq Close A lid 183 is provided to be slidable. On the other hand, on the holder 177 side, there is a recess 18 as a retaining portion that engages with a retaining protrusion 183a formed on the lid body 183.
4 is formed, and when the fitting protrusion 175a is inserted into and removed from the holder 177, it is removed as shown in FIG. 20(a).
As shown in FIG. 17(b), the lid 183 slides to open and close the developer discharge port 180. Furthermore, as shown in FIG. 17 and FIG. Gear 18 integrated with the coupling 181
6, a worm gear 187 that meshes with this gear 186, and a motor 188 that drives this worm gear 187, and is attached to a movable pace 190 that is slidable in the direction of arrow F in FIG.

The motor 188 is driven for a predetermined period of time by the detection signal from the developer embossing detector 174, and the transfer screw 176 is rotated.

As a result, the developer Db in the container 175 is sent to the developer discharge port 1'78 side, and is sent to the replenishment port 179 of the developer receiving and conveying section 133a.

Next, the replenishment port 179 of the developer receiving and feeding section 133a is opened.
The developer Db fed into the developer container 150 is transported upward into the developer storage section 150 as the developer transfer shaft 182 rotates.

On the other hand, developer discharge ports 201a to 201 are provided at the bottom of the developer guide 200 surrounding the developer transport shaft 182.
1b is provided with a certain interval La to Lg, and the developer stirring body 15 is provided in the developer storage section 150.
It is distributed over substantially the entire axial direction of the two. Interval La%L between the developer discharge ports 201a to 201h
g becomes narrower as it goes in the developer transport direction, and the opening area of the developer discharge ports 201a to 201h is larger in the developer transport direction, so that the developer Db is uniformly distributed. It has become.

In addition, when removing the cartridge-type developer replenishing device 172, such as when the developer Db runs out, first move the drive device 180 in the state shown in FIG. 18 to the right in the figure. The engagement operation between the connecting portion 176a of the transfer screay 176 and the coupling 181 is released. Next, the entire developer replenishing device 172 is placed in the holder 177.
The fitting protrusion 175m is pulled out from the holder 177 by rotationally displacing the fitting protrusion 175m to the front side around , and then pulling the fitting protrusion 175m to the front side.

Furthermore, when installing a new developer replenishing device 172, the above procedure can be reversed.

On the other hand, as shown in FIGS. 18 and 19, the developer replenishing device 17 on the first developing unit 132 side is different from the developer replenishing device 17 on the second developing unit 133 side.
It has almost the same configuration. That is, 210 is a container that stores the developer Da, and a transfer screw 211 that is rotated and driven to transport the developer Da in the axial direction is housed at the bottom of the container 210.

Further, at the lower part of one end of the nine-feed screwdriver 211 of this container 210 located in the developer transfer direction, there is a holder 21 as a mounting section connected to the developer receiving and conveying section 1338.
A fitting protrusion 210a that can be freely inserted into and removed from 2 is formed. A developer discharge port 213 for discharging the developer Da transferred by the transfer screw 211 is formed on the lower surface side of the fitting protrusion 210a.

Further, the holder 212 is connected to the developer receiving and conveying section 133.
It is rotatably attached to the top surface of a, and a replenishment port 214 is formed on the bottom surface of the developer stirring body 140, which corresponds to the area between the developer agitating bodies 140, 140, which are formed of spiral shafts. It has become.

Further, the holder 2 is attached to one end of the transfer screw 211.
12 has a connecting portion 211a that protrudes from the end surface of the drive device 215 and connects to the quick-motion coupling 216 of the drive device 215.

A developer discharge port 21 is provided on the lower surface side of the fitting protrusion 210a.
A lid body 217 is provided to be slidable to open and close 3.

On the other hand, on the holder 212 side, a recess 218 is formed as a retaining portion that engages with a retaining protrusion 217a formed on the lid body 217.
During the insertion/removal operation of 10 m, the lid body 217 slides to open and close the developer discharge ports 2 and 3 in the same manner as described above.

Further, as shown in FIGS. 17 and 18, the drive device 215 includes a gear 21 integrated with the coupling 216.
9, a worm gear 220 that meshes with this gear 219, and a motor 221 that drives this worm gear 220, and is attached to a movable base 2, 22 that can slide in the direction of arrow G in FIG. There is.

Note that 223 shown in FIG. 18 is a support member that supports the side end surface of the container 210.

Then, the motor 221 is driven for a predetermined period of time by the detection signal from the developer embossing detector 173, and the transfer screw 211 is rotated.

From this K, the developer Da in the container 2 θ is sent to the developer discharge port 213 side, and is sent to the replenishment port 214 of the developer receiving and conveying section 132a.

Next, the replenishment port 214 of the developer receiving and conveying section 132a
The developer Da fed into the developer storage section 138 is uniformly distributed to the developer storage section 138 by developer agitators 140, 140 each having a spiral shaft.

In addition, when removing the cartridge-type developer replenishing device 171, such as when the developer Da runs out, first displace the drive device 215 in the right direction in the figure in the state shown in FIG. Connecting part 2
11a and the coupling 216 are released.

Next, the entire developer replenishing device 121 is rotated toward the front about the holder 212, and then pulled toward the front to pull out the fitting protrusion 210g from the holder 212.

Furthermore, when installing a new developer replenishing device 171, the above procedure can be reversed.

Further, as shown in FIGS. 22 and 23, the developer Db
A stirring blade 225 is rotatably housed in the container 175 containing the developer Db.

Transfer screw 176 that transfers to the developer discharge port 17B side
A plurality of pawls 22 that mesh with a sprocket 226 attached to the
7... is provided protrudingly. And transfer class I):,
, -1y6, the stirring blade Dk225 rotates,
The configuration is such that the developer Db in the container 175 is prevented from clumping or having a one-sided smell, and can be reliably supplied without any residual developer Db.

1 On the other hand, a stirring blade is similarly housed in the container 210 that houses the developer Da, and is configured to similarly stir the developer Da in the container '2 no.theta. .

Note that 228 shown in FIG. 17 is a collection box for collecting the developer scraped off by the cleaning device 18, and can be easily removed by opening the front cover 170. It is also a mognet catch for holding the 229-piece front cover 170 by suction.

Next, with reference to FIGS. 24 to 28, the automatic paper feeder 2
The configuration of 0 will be explained.

As shown in FIG. 28, paper feed cassettes 7, 8, 9 each containing paper P are removably attached to the upper surface of the base 240 via guides (not shown).

As shown in FIG. 25, each of these paper feed cassettes 7, 8, 9 has guides 241, 242a, 242b that regulate the rear end position and both side edges of one paper P, and a paper support that supports the paper output end side. It has a configuration including a plate 243.

The paper support plate 243 is supported so as to be able to swing freely by engaging a groove formed on the bottom surface of the cassette main body 244 with the end opposite to the paper output side thereof. Further, the paper support plate 243 is formed with through holes 245, 245, and the paper support plate 243 at the bottom of the cassette body 244 is
Four openings 246 are formed at positions corresponding to the four openings 246.

In addition, the cover 10 of the uppermost paper feed cassette 7 constitutes a manual paper feed tray 1, as shown in FIG. A pair of guide members 247, 247 for guiding are provided. These pair of guide members 247, 247
As shown in FIGS. 29 to 29, they are attached to the cover 10, and when one of the guide members 247 is moved, the other guide member 247 is moved in conjunction.

FIG. 27 shows the cover 10 viewed from the back side, and a pair of racks 249, 249 are arranged symmetrically around a pinion 248 that is rotatably arranged at the center of the width direction of the cover 10. One end engages with the pinion 248, and the other end is fixed to the corresponding guide member 247 through pins 250 and 251, respectively.

Therefore, when one guide member 247 is moved along the width direction {circle around (2)}, the other guide member 247 slides toward or away from each other in conjunction with this movement. That is, the binions 248 and 249 constitute interlocking means for interlocking both guide members 247. The bins 250, 251 are inserted into corresponding elongated guide holes 252 at intervals, as shown in FIG. Because there are
The rack 249 is thereby guided to move along the width direction H. In addition, a guide pin 256 is further provided on both sides of the cassette body 1, sandwiching the binion 248.
0, and the rack member 249 is guided and held by the back surface of the corresponding rack 248 so that it does not come out of mesh with the pinion 248. In the figure, 257 is provided on the back surface of the cover 10 by appropriate means. This is an attached guide reinforcing plate, and is provided in the width direction along the running path of the rack 249 which constitutes the interlocking means. This guide reinforcing plate 257 is also formed with a long hole that matches the long hole 252 of the cover 100.

Further, the pivot shaft portion 2 rotatably supports the pinion 248.
58 is provided protruding from the back surface of the cover 10 as shown in FIG. 29, and a braking member 259 made of a rectangular leaf spring is fixed to the upper end of the pivot shaft 258 with a screw 260. . The left and right pair of cut-and-raised tongues 259a and 259m of this braking member 259 are bent and elastically frictionally engaged with the outer peripheral edge of the pinion 248, and both ends 259b of the braking member 2590.

269b is bent at a right angle and a cut is formed there.
A large portion (not shown) is engaged with the guide pin 256. Therefore, the rotational movement of the pinion 248 is slightly braked by the tongues 259a and 259m of the braking member 269, so that blind movement due to overturning is prevented. Therefore, the entire movement of the interlocking means is also subjected to a light braking action, so that when the guide members 247, 247 are moved, it is possible to prevent blind movement of each moving member due to inertia or positional shift due to vibration.

In addition, each paper support plate 243 of each paper feed cassette 7, g, 9
is a support plate push-up mechanism 26 provided in each cassette mounting section.
The uppermost sheet of paper P is selectively pushed up by the rotating operation of the push-up lever 264 of No.
Appropriate pressure is applied to the paper feed roller) 265 using force.

The support plate push-up mechanism 263 has a configuration as shown in FIG. 30. That is, 266 is a shaft rotatably supported by a bearing (not shown), and this shaft 266 has approximately 1
The push-up bar 264 and the operating lever 267 are attached with a phase shift of 80 degrees. Further, a spring 268 is connected to the operating lever 267, and the lower surface of the free end thereof is biased so as to be in constant contact with the circumferential surface of the eccentric cam 269.

The eccentric cam 269 sequentially meshes with gears 270j271.2.
The driving force of the motor 274 is transmitted through a gear mechanism 273 consisting of 72. And motor 2
As the eccentric cam 269 rotates, the maximum eccentric part of the eccentric cam 269 opposes the actuating lever 267, so that the actuating lever 267
is pushed up against the biasing force of the spring 268 (
When the least eccentric portions face each other, the operating lever 267 is pulled by the force of the spring (the state shown by the two-dot chain line in FIG. 30).

Accordingly, with this movement, the push-up lever 264, which is in an integral relationship with the operating lever 262 via the shaft 266f, is also rotationally displaced to the state shown by the solid line or the two-dot chain line in FIG. The accumulated MPs are separated from or come into contact with the take-out roller 265.

Further, as shown in Fig. M24, rollers 289 and 290 that roll into contact with each other serve as separating means 288 for separating the second and subsequent sheets of paper P and preventing them from being taken out. It is provided. These rollers 289 and 290 are constructed as shown in FIG.

That is, 291 in the figure is a motor, and this motor 29
are meshed with gears 293 and 294 via gear 292.

The gear 293 is configured to be interlocked with the roller 289 via a shaft 295, and the gear 294 is interlocked with the roller 29 via a shaft 297 having a spring clutch 296 in the middle.
It is configured to work in conjunction with 0.

Further, the spring clutch 296 has a low 5289
, 290 is set to slip when the force at the contact portion exceeds Ta. Further, if the frictional force between the rollers 289 and 290 is Tb, it is set to be Ta)Tb, and the roller 289 rotates according to o-9x9o.
It has become.

In addition, the frictional force between paper P and paper P is Tf, and roller 2
If the frictional force between the roller 265 and the paper P is Tr, it is Tr)Tf since the roller 265 is generally made of a material with a high coefficient of friction such as rubber. And Ta is T r
) T a ) T f.

When the paper is on standby, the paper P is separated from the take-out roller 265, as shown in FIG. 23(,). When feeding paper, as shown in FIG.
After being brought into rolling contact with the sheet P, the uppermost sheet P is taken out as the take-out roller 265 rotates and is sent between rollers 289 and 290 forming the separation means 288.

1 At this time, the second and subsequent sheets of paper P that are taken out by adsorption to the topmost paper P are separated by the reverse rotation of the roller 290, as shown in FIG. 23(c), and only the topmost paper P is separated. It will be taken out.

This means that when paper P enters between rollers 2B9 and 290, roller 289 moves paper P in the direction of arrow J by Tr)Tf.
Also, row, 729o and paper P... are Tr)Ta)T
This is because it is returned in the opposite direction by f.

Note that when one sheet is started to be taken out, the push-up lever 264 is lowered as shown in FIG.
It will wait in the state shown below.

Also, as shown in Figure 33, the paper feed cassette 7°8.9
At a position corresponding to the bottom side of the paper and at a position corresponding to the paper transport path immediately before the separation means 288, there are reflective optical type seven F300 paper detectors connected to a control section (not shown).
, 301 are arranged. And these two sensors f3
00° 301 constitutes a paper-absence detection means 302 that determines that there is no paper based on the sum of the paper-no-paper detection signals.

Then, as shown in FIG. 33(a), the paper support plate 243
When the paper P is placed on top of the paper P, this can be detected when the paper support plate 243 is lowered, but as shown in FIG. If one sheet is held between the rollers 289 and 290, it cannot be detected by the 9 cm 300 installed at the position corresponding to the bottom side of the paper feed cassette 7 (8, 9). This can be detected by a sensor f301 provided at a position corresponding to the paper conveyance path immediately before the separating means 288. Therefore, it is possible to prevent a determination that there is no paper even though there is paper P.

In addition, a reflective optical sensor 300.3 is used as a paper detector.
01, it is possible to detect the paper P in a non-contact state, and in addition, compared to using a transmission type optical centimeter, it is less affected by external light and is easier to install. There are benefits.

Further, as shown in FIG. 24, the paper P that has passed through the separating means 288 is transferred to the roller 24 of the stopped registration roller pair 2a.
The aperture is attached to the contact portion between a and 24b, and after the skew of its tip is corrected, it is sent to the image transfer section 21 in synchronization with the image forming operation on the photoreceptor 12. Also, the uppermost separation means 288 and the registration roller pair 24
A pair of transfer rollers 305 consisting of rollers 305 and 306 is arranged between them.

The take-out rollers 265..., the transfer rollers 305bs of the transfer roller pair 305, and the rollers 24a of the registration roller pair 24 are configured to be driven via a power transmission system 306 shown in FIG. In other words, 3 in the figure
07 is a pulse motor as a driving means, and a driving gear 308 attached to the driving shaft of this motor 307 is meshed with a gear 310 via an intermediate gear 309. The gear 310 is attached to the shaft of one roller 24a of the pair of registration rollers 24 via a one-way clutch 311.

Further, a sprocket 312 is integrally attached to the intermediate gear 309, and a sprocket 312 is attached to the driven gear 312 via a chain 313.
14 and a sprocket 315 that is integrated with the sprocket 315.

The sprocket 315 is attached to the shaft of the transfer roller 305b via a one-way clutch 319, and a gear 314 is attached to the shaft of the transfer roller 305b. The gear 314 further includes an intermediate gear 316,
317, and is in mesh with a gear 318 attached to the shaft of the take-out roller 265.

When the motor 307 rotates forward (in the direction of the solid arrow), the one-way clutch 311 is turned off and the one-way clutch 315 is turned on, and the take-out roller 26
5 and roller 305b are driven, and the roller 24a is in a stopped state with no power being transmitted to it. Also, motor 3
When 07 rotates in the opposite direction (in the direction of the dashed arrow), it rotates in one direction 2.
□ Te 311 is on, one-way clutch 315 is o
ff state, only the roller 24a is driven, and the rollers 305b and 265 are in a stopped state with no power being transmitted due to the action of the one-way latte 319.

In this way, the take-out roller 265 and the registration roller pair 2 are rotated in the forward and reverse directions of the pulse motor 307 as a driving means.
The configuration is such that one of the rollers 24a of the rollers 24a is selectively rotated.

Further, in the uppermost paper feed cassette mounting section, there is a manual feed roller 321 that sequentially takes out the sheets of paper P set in the manual feed tray 11 one by one and sends them to the separation means side via the take-out roller 265 section. is provided. The manual feed roller 321 and take-out roller 265 are shown in FIGS. 24 and 35.
The roller approaching/separating means 322 shown in the figure is configured to freely approach and separate from the paper conveyance path, and is configured to separate the take-out roller 265 from the paper conveyance path at least during manual paper feeding.

That is, the spindle 265a of the take-out roller 265 is attached to and supported by the free ends of the arms 323, 323, which are rotatable about the spindle 289a of the roller 289 of the separation means 288 as a fulcrum. In addition, the manual feed roller 321 is
The arm 324 is rotatable around the support shaft 265a of No. 5 as a fulcrum.
, 324.

Further, latching protrusions 342a are integrally provided at the free ends of the arms 324, 324 in a state that they are perpendicular to each other, and these latching protrusions 342m.

342a is a reno (-327,3
27 and extends above the free end thereof.

The rotating member 326 is always urged counterclockwise by the spring 328 in the state shown in FIG. Part 324m, 32
4a is in a lifted state.

Further, the rotating member 326 includes a plunger-type lensoid 3.
29 plungers 329a are connected via a connecting member 330, and the rotating member 326 is connected to a spring 328.
The structure is such that it can be rotated against the urging force of.

Note that 331 in FIG. 24 is a manual paper feeder placed in front of the manual feed roller 321. Also, the 35th
As shown in the figure, the spindle 265aJfC of the take-out roller 265
A sprocket 332 is attached to the support a 321a of the manual feed roller 321, and a sprocket 333 is attached to the support a 321a of the manual feed roller 321, so that they are interlocked with each other via a chain 334.

When paper P is placed on the nail feed table 1), the manual paper feed switch 331 is turned on, and the start button 30 is turned on.
As a result, the solenoid 329 is turned on. and,
The rotating part 326 is rotated against the biasing force of the spring 328, and the manual feed roller 321 is lowered, and in conjunction with this movement, the take-out roller 265, which is a perfect circular roller, moves upward to move away from the paper conveyance path. Displaced to.

Then, when the paper P is sent to the separating means 288, the solenoid 329 is turned off, the manual feed roller 321 is raised, and the take-out roller 265 is accordingly lowered.

At this time, the push-up lever 264 that pushes up the claw support plate 243 of the paper feed cassette 7 is in a lowered state, and the paper P
is separated from the extraction a-/Fze5.

Next, the fixing device 25 will be explained with reference to FIG.

The fixing device 25 is roughly divided into an upper roller unit 336 and a lower roller unit 337.

The upper roller unit 336 has a heat source (not shown) inside.
A heat roller 338, which houses the heat roller 338 and whose outer surface is coated with Teflon, is attached to a bracket 34θ rotatably supported via a support shaft 339.

The lower roller unit 337 has a pressure roller 341 made of a rubber roller attached to a bracket 343 that is always urged upward by a compression spring 342. The bracket 343 has elongated holes 345° 345 through which guides @ 344 and 344 are inserted, and can move up and down within the range of the elongated holes 345.

The bracket of the roller unit 336? A movable frame 346 is provided near the free end side of 40 . The movable frame 346 is a part of the frame of the upper unit, which is rotatably provided so as to be separated from the lower unit almost at the paper conveyance path 23 of the copying apparatus main body 4. And FIG. 36(a)
As shown in , when the upper unit is superimposed on the lower unit, the movable frame 346 is in contact with the upper surface of the free end side of the bracket 340, and the heat roller 338 is biased by the biasing force of the compression spring 342. The pressure roller 341 is brought into contact with the pressed roller 341 in a depressed state, and a predetermined contact pressure is obtained.

In addition, the paper conveyance path 2 is
3, when the upper unit is separated from the lower unit to open the bracket 346, the movable frame 346 is far away from the upper surface of the free end side of the bracket 340, and as shown in FIG.
, ), the bracket 340 has a configuration in which the bracket 340 can be rotated by a maximum of about 95 degrees using the support shaft 339 as a rotation fulcrum.
It has become. Note that such a configuration makes it easy to replace the heat roller 338 and the pressure roller 341.

Next, the paper P discharged from the paper discharge section 22 of the image forming apparatus 1 configured as described above is received as necessary, and the paper P is returned to the image recording apparatus 1 in the same state or in the reversed state.
The configuration of the direction changing conveyance device 2 for conveying the image to the image forming section is as follows.
This will be explained with reference to FIGS. 7 to 41.

As shown in FIG. 37, this direction conversion conveyance device 2 is composed of a unit independent of the image recording device 1, and also serves as a mounting table on which the image forming device 1 is removably mounted.

This direction conversion conveyance device 2 is a discharge section 2 of an image forming apparatus 1.
2, a guide means 350 is provided near the guide means 350 for introducing the ejected paper P as necessary; a carry-in path 351 for carrying in the paper P guided by the guide means 350; a temporary stacking section 352 that temporarily stacks the sheets P that have been collected, a take-out means 353 that sequentially takes out the sheets P accumulated in the temporary stack 352 one by one, and a multiplex image formed on the sheets P taken out by the take-out means 353. A first conveyance section 355 that guides the paper to the paper introduction section 354 as an image recording body introduction section of the image forming apparatus 1 without changing its leading edge direction, and a first conveyance section 355 that is branched from the first conveyance section 355. , a second conveying section that changes the conveying direction so that the trailing end becomes the leading edge in order to form a double-sided image on the sheet P taken out by the taking out means 353, and guides the sheet P again to the sheet introducing section 354 of the image forming apparatus 1; 356 and the paper P taken out by the take-out means 353 provided at the branching part between the second transport section 356 and the first transport section 355.
a driving means 358 for switching the guide means 3501, the distributing means 357, etc. in accordance with multiplex and double-sided switching signals from the motor switching button 33 as an operation section of the image forming apparatus l; 359.

The guide means 350 consists of a gate 362 rotatably provided by a support shaft 361, and this gate 362
The paper ejection unit 22 and the paper ejection roller pair 3 of the image forming apparatus 1
63 to the paper discharge tray 364 and the input path 366 to the temporary stacking section 352, and is driven by the driving means 358 to selectively guide the paper Pt. It has become. That is, the gate 362 is always urged in a predetermined direction by a spring 367, and normally the gate 362 is pushed in a predetermined direction by a spring 367.
The straight conveyance path 365t is in the "closed" state, and the linear conveyance path 365t is in the "open" state.

A solenoid 369 is connected to the gate 362 via a connecting member 378, and the gate 362 is operated by a spring 367 in order to open the carry-in path 366 and close the linear conveyance path 365 as needed. The structure is such that it can be rotated against biasing force.

In addition, a first conveying roller pair 370 is provided in the carry-in path 366.
．． Second transport roller pair 371. Third conveyance roller pair 37
2 is arranged to forcibly feed the paper P to the temporary stacking section 352. As will be described later, the third pair of transport rollers 372 is configured such that the receiving and discharging position of the paper P is movable with respect to the feeding direction of the paper P.
Regardless of the size, the tip thereof is configured to be compatible with the take-out means 353 provided corresponding to the end side of the temporary accumulation section 352 in the take-out direction.

Further, the temporary stacking section 352 is constituted by the upper surface portion of the guide plate 373, and the actuator 374a of the paper detecting means 374 faces the central portion thereof.

The take-out means 353 includes a take-out roller 377 held at the free end of an arm 376 that is pivotally supported via a support shaft 375.
The take-out roller 377 is configured to be displaced upward when the paper P is accumulated in the temporary accumulation section 352 so as not to interfere with the accumulation of the paper P.

That is, a protrusion 376a is formed on the pivot end side of the arm 376 and comes into contact with a lever 378 that rotates using a solenoid 378 as a drive source.
8, the on J operation causes the take-out roller 377 to displace the protrusion 376a upward as shown by the solid line in FIG. It moves downward under its own weight and comes into contact with the paper P accumulated in the temporary accumulation section 352.

In addition, a pair of rollers 380 (7a * 80b) is provided in the paper ejecting direction of the ejecting means 353 configured as described above, and a pair of rollers 380 consisting of rollers 38 (7a*j80b) is used to transfer the paper P taken out from the temporary stacking section 352. The liquid is sent to the sorting means 357.

Next, the transport roller pair ? The configuration of the direction changing portion of the paper P fed through the paper P will be described with reference to FIG. 38.

That is, the roller pair 380 as the first conveying means
a first conveyance path 382 for conveying the paper P; and a second conveyance path 382 for conveying the paper P, and a second conveyance path 383 for communicating with the first conveyance path 382 and serving as a second conveyance means. 384, a third conveyance path 386 that branches from the terminal end of the first degree conveyance path 382 and is provided with a pair of conveyance rollers 385 as a third conveyance means, and a state where it merges with this third conveyance path 386. and a fourth conveyance path 387 branched from the base end of the second conveyance path 384.

Furthermore, the first conveyance path 382 and the third conveyance path 386
The paper P conveyed through the first conveyance path 382 by a pair of conveyance rollers 380 provided at a branching point between the two conveyance paths 384 and
Alternatively, a first guide means 388 that selectively guides the third conveyance path 386 and a second conveyance means 383 provided at a branching point between the second conveyance path 384 and the fourth conveyance path 387 The paper P that has been reversely fed through the conveyance path 383 is transferred to the fourth
A second guide means 389 for guiding the paper to the conveyance path 387 side is provided, and constitutes the sorting means 357.

Further, the second conveyance path 384 includes a first conveyance path 38
2 to the second conveyance path 384 reaches a predetermined position, and controls the conveyance roller pair 383 to reversely convey the sheet P.
is provided.

And the above-mentioned 1. By switching the second guide means 388 and 389, the sheet P conveyed through the first conveyance path 382 can be conveyed without changing its leading edge in the conveying direction, or the trailing edge in the conveying direction becomes the leading edge side. After changing the conveyance direction to
54.

In addition, the above-mentioned No. 1. The second guide means 388 and 389 are pivotally supported via a support shaft 39 and a plunger 39 of a plunger type solenoid 392 as a driving device.
2a through connecting members 393 and 393t, respectively, and turn on the solenoid 392.
, OFF operation causes a rotational displacement as shown by a solid line or a two-dot chain line in FIG.

Next, we will explain the temporary duplex copying operation. , start button (
Press the print button) 30.

(b) The solenoid 369 of the guide means 350 is activated.
``Here, the copied paper P is transferred to the direction changing conveyance device 2.''
guided by.

(c) The sheets P on which one-sided copies have been made are accumulated in the temporary accumulation section 352.

(d) The solenoid 396 of the guide means 360 returns to 0 (,) Replace the original, set exposure, etc., and press the start button 30.

(f) Retrieval means 35 provided in the temporary accumulation section 352
No. 3 solenoid 378 is pulled, and the take-out roller 777 is lowered.

(ω To take out -2377, a pair of conveying rollers 380 that also serves as a separating means, and a pair of conveying rollers (pair of rollers) 383 rotate.

(h) When the leading edge of the paper P has sufficiently reached the pair of transport rollers 380, the take-out roller solenoid 378 returns and the take-out roller 377 rises.

(i) The transport roller pair 380 stops at the time when the leading end of the iP sufficiently reaches the transport roller pair 383.

(However, the conveyance roller pair 380 has a one-way latch and is rotated by the paper P until the rear end of the paper P pulled by the conveyance roller pair 383 separates.) (j) The rear end of the paper P is detected by the paper detection means. 390, the conveyance roller pair 383 reverses, the solenoid 392 of the distribution means 357 is pulled, and the conveyance roller pair (feed roller pair) 385 rotates.

(k) The leading edge of the paper P is the image transfer section 21 of the copying device 1
When the sheet P reaches the pair of aligning rollers 24 located in front of the sheet P, the pair of transport rollers 383 and 385 stop, and the sheet P is aligned.

When the JEP for (1) is sent to the image transfer section 2I and its rear end is separated from the distribution means 357, the solenoid 392 of the distribution means 357 returns.

(However, the rollers 385a and 38 of the conveyance roller pair 385
Reference numeral 5b has a one-way latch and is rotated by the paper P pulled by the pair of aligning rollers 24. ) - With the distribution means 357 in its returned state, the temporary accumulation section 3
Until the one-sided copied paper P in 52 runs out (f) ~
The operation of (1) will be repeated.Next, we will explain the operation of double copy temporary.0 (,) First, operate the mode switching button 33 on the operation panel 6 to specify "duplex mode". After setting the number of sheets, exposure, magnification, etc. using separate operations, press the start button (
Press the print button) 30.

(b) The solenoid 369 of the guide means 350 is pulled, and the copied paper P is guided to the direction changing conveyance device 2.

(c) The sheets P on which one-sided copies have been made are accumulated in the temporary accumulation section 352.

(d) Solenoid 396 of guide means 350 returns 0 (e) Replaces the original, sets exposure, etc., and presses start button 30 (f) Retrieval means 35 provided in temporary accumulation section 352
No. 3 solenoid 378 is pulled, and the take-out roller 377 is lowered.

(ω The solenoid 392 of the sorting means 357 is pulled, the take-out roller 377 and the conveying roller pair 380 which also serves as the separating means
, and a pair of transport rollers (pair of feed rollers) 385 rotate.

(h) When the leading edge of the paper P has sufficiently reached the transport roller pair 380, the take-out roller solenoid 378 returns and the take-out row 5377 rises.

(i) The transport roller pair 380 stops when the leading edge of the paper P reaches the transport roller pair 385 sufficiently. (However, the transport roller pair 38θ has a one-way latch and is rotated by the paper P until the trailing edge of the paper P pulled by the transport roller pair 385 separates.) (j) When the leading edge of the paper P Image transfer section 21
When reaching the aligning roller pair 24 located in front of In this state, the paper capacity of the one-sided copied paper in the temporary storage section 352; until it runs out;
The operations (f) to (j) above are repeated.0 Furthermore, the paper P ejected from the paper ejection section 22 of the image forming apparatus 1 is received as needed, and the paper P is left as it is or the front side is turned upside down. In the direction changing conveyance device 2 configured to be able to form multiple or double-sided images on the paper P by guiding it to the image transfer section 21 of the image recording device 1 again as the image forming section of the image recording device 1, As shown by the two-dot chain line in FIG. 37, the member located on one side (lower side) of the paper P passage section is configured to be freely displaceable outward (lower side) to open the paper passage path. ing.

That is, the lower guide plate 400a of the guide plates 400a and 400b forming a part of the carry-in path 366.

Lower roller 371 of conveyance roller pair 37111, 371b;
The guide plate 373 that constitutes the is temporary accumulation section 352, and the first. The lower guide plate 401, the lower roller 380a of the pair of conveying rollers 180a, 380b, and the lower roller 383a of the pair of conveying rollers 383a, 383b, which constitute the second conveying path 382, 383, are arranged with the − side of the conveying direction of the paper P as a fulcrum. It is rotatably provided and attached to a support frame 402, and is configured to be able to be displaced outward all at once in order to open the paper passageway as the support frame 402 is displaced.

Further, on the free end side of the support frame 402, holding means 403, 403 for holding the support frame 402 in a predetermined state are provided.
By operating these holding means 403 and 403, the paper transport section can be opened, and paper jams and the like can be easily dealt with.

In addition, as shown in FIGS. 39 to 41, the carrying means that receives the paper P that is next conveyed and sends it to be stacked in the temporary stacking section 352 is movable in the feeding direction of the paper P. It has become.

That is, the carrying-in means is composed of the conveying roller pair 372 having a driving roller 372a as a first conveying roller and a driven roller 372b as a second conveying roller.

The drive roller 372a has a slit 40 as a guide section.
5, 405 has a support shaft 407 that is movably horizontally supported by holding a bearing (push: L) 406° 406, and the driven roller 372b is connected to the driving roller 37.
A driving roller 372 is used to nip and convey the paper P between the drive roller 372 and the
It is provided so as to be in continuous rolling contact with a and is movable integrally with the variable roller 372a.

The slits 405, 405 as the guide portions are formed by a pair of side frames 408 that are spaced apart and facing each other with the paper conveyance path in between.
, 408, respectively. Furthermore, the bearings 406, 406 held by the slits 405, 405 are positioned by positioning means 409, 409 provided on the outside of the frames 408, 408.
It is fixed at a predetermined position depending on the O size.

Each positioning means 409 is provided along the movement path of the bearings 406, 406, as shown in FIGS. It has a lever 411 as a positioning member having a diameter of .410, and has a 7IC configuration. This lever 411 has one end connected to the frame 41 through a shaft 412.
A spring 113 is rotatably attached to the shaft B and is connected to the free end side of the spring 113 as a biasing member that constantly biases the concave portion 410 to fit into the bearing 406.

Note that 414 shown in FIGS. 39 and 41 is the bearing 4.
06, 406 is a movable frame that moves together with the drive roller 372a, and 415 is a movable frame 41
4 to drive the driven roller 372b.
) 372a side.

Therefore, when setting the transport roller pair 407 that feeds the paper P to the temporary stacking section 352 to a position corresponding to the size of the paper P, both levers 411 are rotated against the biasing force of the spring 413. In the moved state, the movable frame 41
4 and place the bearings 406, 40 in the predetermined recess 410.
6 should be fitted. In this way, the transport roller pair 407 can be moved to a position that suits the paper P very easily without using any tools such as a screwdriver.
The used iPs can be accumulated in the temporary accumulation section 352 in a removable manner in an orderly manner.

As shown in FIG. 42, if necessary, a large-capacity paper feeder 420 that stores a large amount of paper P instead of the lowermost paper feed cassette 9 can also be used instead of the paper ejection tray 364 for collating paper. A device (sorter) 421 can be attached.

The large-capacity paper feeding device 420 has a configuration in which the movement of an elevator plate 424 that can be raised and lowered is controlled by a lifting means 423 that uses a motor 422 as a drive source so that the uppermost sheet P is always in rolling contact with a take-out roller 425. As the take-out roller 425 rotates, the topmost paper P
are taken out sequentially. Further, the taken out paper P is transferred to a guide plate 426 provided in the conveying section 420a,
427 to the take-out roller 265 disposed in the cassette loading section, and then to the pair of aligning rollers 24 via the separating means 288.

On the other hand, as described above with reference to FIG. 33, a reflection amount optical sensor 300 is disposed corresponding to the paper feed section as a paper no-paper detector that sends a "no paper" detection signal to the main body of the apparatus. It is in a state. Therefore, this large capacity paper feeder 42
The conveyance section 420a of No. 0 has a built-in signal generation control means 428 for controlling the generation of a signal indicating "no paper" even though there is paper P.

As shown in FIGS. 43 and 44, this signal generation control means 428 has a shutter member 429 made of a reflective plate that can be moved freely with respect to the optical path of the reflective optical centimeter 300, The device 420 is configured with a shutter mechanism that blocks light with the shutter member 429 when there is paper P, and allows light to pass through when there is no paper P.

The shutter member 429 is provided at the free end of an arm 431 that is pivotally supported by a shaft 430, and is in a state where it can open and close a mouth portion 432 formed at the bottom of the conveyance section 420a.

The arm 431 is urged by a spring 433 to a state in which it constantly contacts the stopper 434, that is, a position in which the shutter member 429 does not close the opening 432.

Further, a solenoid 34 is provided on the pivot end side of the arm 431.
5 are connected, and by turning on the renoid 345, the arm 431 is displaced against the biasing force of the spring 433, and the shutter member 42 is connected.
9 can be opposed to the opening 432.

〔Effect of the invention〕

As described above, the present invention includes an exposure light source that irradiates light onto the document placement surface and a reflection member that reflects reflected light from the original and the document placement surface in a predetermined direction. a first optical unit that moves along the same direction as the first optical unit;
The second optical unit has a reflecting member that moves at one-times the speed of the first optical unit and reflects the optical image reflected from the first optical unit toward the lens side.
an exposure optical device comprising an optical unit configured to scan a document placed on a document placement surface KR and form an image on an exposed area; a first shield provided to cover the lens; and a second shielding member that is attached to the second optical unit and movable with a portion overlapping the first O shielding member, and is partitioned to form a cooling air conduction path along the document placement surface. The structure is provided with partition means. Therefore, although the configuration is extremely simple, it is possible to provide an exposure optical device that can sufficiently cool the document @I and the exposure light source, and can reliably prevent the adverse effects of stray light.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of an image forming unit device employing the exposure optical device of the present invention, FIG. 2 is a schematic longitudinal sectional front view, FIG. 3 is a schematic longitudinal sectional front view of the image forming apparatus, and FIG. 4 is a schematic longitudinal sectional front view of the image forming apparatus. A plan view of the operation panel, Fig. 5 is an explanatory diagram of the configuration of the exposure optical device, Fig. 6
The figure is an explanatory diagram showing the cooling air conduction path, and FIG. FIG. 8 is a perspective view showing the operating means of the second optical unit, FIG. vertical side view, M2O diagram (a),
(b) is an explanatory diagram showing the opening and closing states of the developer discharge port when the container of the developer replenishing device is attached and removed, and FIG. 21 is a schematic plan view showing the configuration around the developer receiving and conveying section of the second developing unit. 22 is a schematic sectional view of the developer replenishing device, FIG. 23 is a schematic exploded perspective view of the developer replenishing device, FIG. 24 is a schematic front view of the paper feeding device, and FIG. 25 is a schematic sectional view of the developer replenishing device. A perspective view of the paper feed cassette with the cover removed; Figure 26 is a perspective view of the cassette cover that also serves as a manual paper feed tray; and Figure 27 shows the installation of the guide member of the manual paper feed tray with support for pushing up the support plate. A schematic perspective view of the plate push-up mechanism, FIG. 31 is a schematic configuration explanatory diagram of the separating means, and FIGS. 32 (,) to (d)
is an explanatory diagram showing the paper separation state of the separation means, FIG. 33(a)
), (b) is an explanatory diagram showing the arrangement state of the no-paper detector in the paper feed cassette installation part, FIG. 34 is a configuration explanatory diagram showing the take-out roller and aligning roller (7) ffi dynamic system,
5 is a schematic plan view showing the configuration of the roller approaching/separating means for approaching and separating the manual feed roller, FIGS. 36(a) and 36(b) are schematic front views showing the configuration of the fixing device, and FIG. 37 is a direction change. FIG. 38 is a front view showing the configuration of the paper sorting section of the direction changing conveyance device; FIG. 39 is a schematic longitudinal sectional front view of the conveying device; FIG. 40 is a partially cutaway front view, FIG. 40 is a perspective view of the main parts of the paper loading section, FIG.
Figure 2 is a schematic vertical cross-sectional front view of the image forming unit device in which a large-capacity tray paper feeder is installed in place of the lowermost lick feeding cassette, and a collating device is installed in place of the paper ejection tray, and Figure 43 is a collating unit. 44th plan view of the signal generation control means incorporated in the conveyance section of the device;
The figure is a side view of the same signal generation control means. 5... Original placing section, 14... Exposure optical device, 5...
... Exposure lamp (light source), 52 ... Reflection member (first mirror), 53 ... First optical unit, 54 ... Lens unit, 55 ... Reflection member (second mirror), 5
6... Reflection member (third mirror), 57... Second optical unit, 67... Cooling air guide path. Applicant's Representative Patent Attorney Takehiko Suzue Figure 7 Figure 8 North Side Figure 11 Figure 12 Figure 13 Figure 14 Figure 19 Figure 20 (a) (b) Figure 26 tbb 7 (8, 9) Fig. 27 14 745 14 1 U Fig. 30 Fig. 32 (a) (b) Fig. 32 (c) Fig. 34...tsu 0 Fig. 35 Fig. 43 Fig. 44 4 J2 JIJLI Procedure Correction Writing Method) % Formula % 1. Indication of the case/Patent Application No. 59-220504 2. Name of the invention Exposure optical device 3. Person making the correction Relationship to the case Patent applicant (307) Higashi Co., Ltd. C4, agent

Claims (3)

[Claims] (1) A first optical unit that moves along the document placement surface and includes an exposure light source that irradiates light onto the document placement surface and a reflection member that reflects light reflected from the document placement surface in a predetermined direction; ,
A reflecting member that moves in synchronization with the first optical unit in the same direction at a speed that is half the speed of the first optical unit, and reflects the optical image reflected by the first optical unit toward the lens side. and a second optical unit having a second optical unit configured to scan a document placed on a document placement surface and form an image on the exposed area, the second optical unit having a second optical unit provided in a state covering the lens. A second shielding member is attached to the first shielding member and the second optical unit and is movable while partially overlapping the first shielding member, and the cooling air guide path extends along the document placement surface. What is claimed is: 1. An exposure optical device characterized by comprising a partitioning means for partitioning to form a. (2) The non-attached end side of the second shielding member attached to the second optical unit is guided over the first shielding member via a support means. Exposure optical device as described in . (3) The exposure optical apparatus according to claim 1 or 2, wherein the support means for supporting the non-attached end side of the second shielding member comprises a roller or a sliding member.