JPS61101338A - Stacking/taking out unit for paper sheets - Google Patents

Abstract

PURPOSE:To enable both stacking and taking out of paper sheets to be carried out neatly regardless of their sizes, by arranging the receiving/delivering position, for one-side copied paper sheets, of a paper sheet feed-in means assigned to a temporary accumulation area, freely movable in alignment with the paper sheets feeding direction. CONSTITUTION:In the case of making either multiple or both-sides duplication, one-side copied paper sheets are brought in a temporary accumulation area 352 via a transport roll couple 371, 372 and stacked there. When one-side duplication is completed and a document is replaced with new one, a taking out roll 377 is lowered to have copied paper sheets taken out one by one by means of its turning motion. Those paper sheets are transported again to an image formation part along the assigned transport route via a direction reversing transport unit. Said transport roll couple 372 is held between the concave part 410 of a positioning lever 411 energized upward by a spring 413 and the slit 405 of a side frame 408 and movable to another concave part 410 against the spring 413 depending upon the size of paper sheet. The paper sheets can be, in this way, neatly stacked and taken out regardless of their sizes.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is directed to sending paper sheets such as image recording bodies that are sequentially conveyed to a temporary stacking section through a carrying means and stacking them once. The present invention relates to a stacking and taking-out device for good-quality paper sheets, in which sheets of paper sheets stacked in a section are taken out one by one by a take-out means.

[Technical background of the invention and its problems]

In recent years, single image forming apparatuses capable of forming multiple or double-sided images on an image recording medium have been put into practical use. On the other hand, in this type of image forming apparatus, in order to form multiple or double-sided images on an image recording medium, it receives an image recording medium with an image formed on one side, temporarily accumulates the received image recording medium, and forms an image on one side. After all the printing is completed, the sheets are taken out one by one and guided again to the image forming section of the image recording apparatus either in that state or in a reversed state.

On the other hand, copying machines and the like usually use multiple image recording bodies of different sizes, and it is necessary to reliably integrate the image forming bodies whose directions should be changed for these multiple image recording bodies of different sizes. You need to take it out.

However, the table shows that in the past, the carrying means provided at the front stage of the temporary stacking section was fixedly provided at a position that matched the large size image recording medium, and In some cases, the position of the tip may be uneven, making it impossible to collect the material in an orderly manner, resulting in failure to take it out.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and an object thereof is to be able to set the conveying means to a position corresponding to the size of paper sheets such as image recording bodies by an extremely simple operation. It is an object of the present invention to provide a paper sheet stacking and retrieving device that can stack and take out paper sheets in an orderly manner regardless of their size.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention sends paper sheets that are sequentially conveyed to a temporary stacking section via a carrying means, stacks them once, and then takes out the stacked paper sheets that have been stacked in this temporary stacking section. In the stacking and taking out device for paper sheets, which is adapted to take out paper sheets one by one by a means, the receiving and discharging position of the paper sheets of the carrying means is movable with respect to the feeding direction of the paper sheets. be.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the external appearance of an image forming unit device employing the paper sheet stacking and taking-out 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 that is attached to the top surface of the copying apparatus 1 and automatically supplies the document A.

The copying apparatus I is constructed as shown in FIG.

In other words, 4 in the figure is the main body of the copying machine, and the upper surface of the main body 4 of the copying machine serves as a document resting section on which the document A sent from the automatic document feeder @sK is placed. A mounting lath 5 is provided, and an operation panel 6, which will be described later in FIG. 4, is provided at the front edge of the upper surface.

In addition, there is a paper feed cassette (7) on the right side of the copying machine main body 4.
8.9 is installed. Also, the upper paper feed cassette 7
The 0 cassette cover 10 serves as a manual paper feed tray 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, 2 electric power 2-developing device R1 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, a paper feed cassette door, 11
．． The paper 21 supplied from the automatic paper feeder 2o equipped with a paper feeder 21, the paper P1 manually fed from the manual paper feeder 11, and the paper P guided from the direction conversion conveyance device 2 are transferred to the photoreceptor 12 and the transfer device 16. A paper conveyance path 23 is formed that guides the image transfer section 21 between the copying apparatus main body 4 and the image transfer section 21 to the discharge section 22 provided on the left side of the copying apparatus main body 4 by means of a string.

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

Further, the operation panel 6 is designed as shown in FIG. 4.

That is, on the right end side of the operation panel 6 there is a start button 30.
A numeric keypad 31 and a total counter 32 are arranged, and on the left end side there is a mode switching I button 33 and a one-sided copy mode display I.
JD J4, double-sided copy mode display LED J5
, dual copy mode display LED J 6, density adjustment-evening 31, automatic exposure methane 38, and first display 39
is located. In addition, a reduced display section 40 is provided in the center part.
゜Same magnification display section 4, enlarged display section 42, variable magnification gettanim 3,
Zoom methane 44, color specified methane 45.

A second display section 46 for displaying the status is also arranged.

As shown in FIGS. 5 and 6, the exposure optical device 14 also includes an exposure run fsx as an exposure light source whose back part is surrounded by a reflector 50 and which irradiates light onto the document placement surface 5a; a first optical unit 53 that has a first mirror 52 as a reflecting member that reflects the reflected light from 5a in a predetermined direction and is movable along the document placement surface 6&;
The first optical unit ss moves in the same direction in synchronization with the first optical unit ss at a speed that is half the speed of the first optical unit 53, and transfers the optical image reflected by the first optical unit 53 to the lens unit 54. The second mirror 55 and the third mirror S
6, and a ninth second optical unit 57 is provided.

Further, at the rear of the lens unit 54, there is a third optical unit 60 having a mirror 58 and a fifth mirror 59 as reflecting members, and the light reflected by the third optical unit 22 and the third mirror 54 is located behind the lens unit 54. The configuration includes a sixth mirror 61 as a fixed reflection member that reflects the image toward the photoreceptor 12 side.

Note that 62 is a dustproof glass provided between the sixth mirror 61 and the photoreceptor 12, and 63 is the exposure lamp 5.
This is a heat ray absorbing glass provided on the front surface of 1.

Then, with the exposure run fsz turned on, the first optical unit 53 moves at a speed V along the original loading surface 5&, and in synchronization with this movement, the second optical unit 53 moves along the document loading surface 5&.
57 moves in the same direction at a speed that is half the speed V, the original placed on the original placing surface JIIK is scanned, and the photoreceptor 12 as the exposed part which is rotated in advance is The image is harmonized so that it forms an image.

And uniformly by charging device R13? An electrostatic latent image corresponding to the original image is formed on the electrified photoreceptor 12.

The electrostatic latent image formed in this way is transferred to the developing device 1sVC.
After being developed by facing the sheet PK, it is sent to the image transfer section 21 facing the transfer device 16, and the developed image is transferred to the sheet PK fed through the aligning roller pair 24. Next, the paper P on which the image has been transferred is subjected to a peeling device [zy
After being peeled off from the photoreceptor 12, the sheet is guided through a conveyance path 23 to a fixing device 25, where image fixation is performed, and then discharged to a discharge section via a pair of paper discharge rollers 26.

On the other hand, the surface of the photoconductor 12 after the paper PK development and abrasion image has been transferred is cleaned by facing the cleaning device 18.
The residual developer (toner) left on the top is cleaned, and then
The afterimage erasing device 19 lowers the potential on the photoreceptor 12 to below a certain level, making the next copying operation possible.

Further, as will be described later, the lens unit 54, and two mirrors 58.5 arranged at an angle of 90 degrees
The third optical unit 6Q 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 serving as a lens force and a force is provided to cover the upper surfaces of the lens unit 54, the third optical unit 54, and the third optical unit 0. At the same time, a second shielding member 66 is provided in the second optical unit (7) so as to partially overlap the first shielding member 65, and a document is placed on the upper surface side of these shielding members 65 and 66. A partition means 68 is configured to form a cooling air guide path 67 along the mounting surface 5a. When the second shielding member 66 is not attached, the end side is guided over the first shielding member 65 via a support means 69 made of a row 2 or a sliding member, and special guiding means is required. It's becoming very dangerous.

9. The first optical unit 57, the lens unit 5
4, and the lower surface side of the third optical 22 and Toro 0 are covered with a partition plate 70 that holds the dustproof lath 62 as a part thereof, and one end of this partition plate 70 is connected to an exhaust fan. The reed copying apparatus main body 4 is substantially partitioned into upper and lower sections when it is connected to the fan casing 72 of 71.

Therefore, as shown by the arrow in FIG.
Due to the function K, the cooling air introduced into the cooling air conduit passage 67 from the right side of the main body of the copying machine A is blocked by the first shielding member 65 and the second shielding member 66 so that the image stand is
After being guided so that it passes reliably along the lower surface side to the left side surface, it is discharged to the outside. For this reason,
The exposure rung 51 can be sufficiently cooled, preventing overheating of the exposure rung 51 and extending its life, and also preventing the adverse effects of heat on other parts as much as possible. Moreover, overheating is prevented over the entire area of the document table 5, so that the operator does not feel uneasy. Also, the second shielding member 6
6 blocks stray light as shown by arrow E, and it is possible to reliably prevent image defects caused by stray light entering 54.

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

That is, the upper horizontal piece 7 is provided on the side of the mutually opposing surfaces of the rear frame 75 and the front frame 16 which are arranged in parallel at a distance.
Guide frames 77, 77 are attached parallel to the guide frames 77, 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. , and t42 optical units 57 are installed. In this way, the first optical unit 53 and the second optical unit 57, which are provided movably on the guide frame 77, 77, are moved in a predetermined direction at a predetermined speed by the optical unit actuating means 29. It has become.

The optical unit operating means 79 has the following construction. 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 III, 81 are attached to both ends thereof, that is, to the outside of both frames 75, 76, respectively. It is being A driven pulley 82 is attached to the support shaft 8 on the outside of the frame 75, 76 corresponding to the other end of the optical unit) 5J, 57 in the moving direction.
3 and is rotatably provided.

On the other hand, both ends of the caliper 84 of the first optical unit ss protrude to the outside of the frame 75, 76.
Both ends of the caliper 85 of the second optical unit 57 have pulley mounting portions 85*, 85b that are vertically folded back along the outer surfaces of the frames 75, 76, and a pair of pulleys II 6 that function as movable pulleys. , 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 90Vc via the spring 89 is pulled out to the driven pulley 82 side, wrapped around the first googly 86 of the second optical unit 57, and folded back. It is wound around and folded back around the driven pulley 82 again. Next, the wire 88 is wound around the driven pulley 82 and then around the second gooey 82 of the second optical unit 57 and folded back, and then 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 the wire 5sFc.

On the other hand, the drive shaft 8o is arranged to be interlocked with a nollus motor 93 and a timing belt 94, and has a drive shaft around which a wire 88 is wound.
If the number 1 is square, it is driven in the opposite direction. The first optical unit ) 53, which is directly fixed to the wire 88, has a speed of V, and the pulley se, which acts like a moving pulley, is connected to the wire 88. ? The second optical unit 51 to which 7 is attached is configured to move at half the speed V.

Further, as shown in FIG. 8, a pair of pulleys lJ6.
7 are attached to support shafts 95° 96 that are each independently arranged on a line parallel to the moving direction of the optical unit 57, that is, in a direction along the tension direction of the wire 88. A stable supporting state can be maintained for a long period of time in a state where no moment in the direction perpendicular to the direction of tension acts and no vibration is generated.

Note that 91 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.

In addition, in order to change the copying magnification as described above, the lens unit 54 and the third optical unit equipped with two mirrors 511 and 59 arranged at a 90 degree angle each have a predetermined amount of Toro 0, i.e. , for example, focal length f
When using a lens with a diameter of 2IC1m, it is necessary to move it approximately as shown in the table below.

However, the direction approaching the third optical unit is (-) and the direction away from the third optical unit is (+).
0 is mounted and supported as shown in FIG. 9, and the lens unit 54 is movable, and the third optical unit 60 is also movable with a small amount of movement compared to the lens unit 54. , a predetermined copying magnification can be obtained.

That is, a pair of screw shafts 100 and 101 are rotatably installed in parallel with each other, sandwiching the movement path of each unit.
0.101, the third optical unit 60 is slidably supported by externally fitting the slide bushes 103 attached to both ends of the carrier 102.

Further, at one end of the carriage 102, there is a four-wheel housing 10 that is engaged with the screw shaft 101.
4 is attached, and as the screw shaft 101 rotates forward and backward, the third optical unit 60 moves toward the screw shaft 10.

It moves back and forth using 100 as a guide.

The screw shaft 101 is configured such that the driving force of the mirror driving pulse motor 1050 is transmitted through a set of gears 106 and 107.

On the other hand, one end of the carrier 10B of the lens unit 54 is held on the screw shaft 100 via slide pushers 120, and the other end is attached to the slider 121 attached to the lower surface of the third optical unit 60. Especially when placed directly on the carrier 102, it is supported in a slidable manner.

Further, at one end of the carriage 10B, there is provided a screw shaft 12 that is engaged with the screw shaft 100.
2 is attached so that it reciprocates as the screw shaft 100 rotates in the forward and reverse directions.

The screw shaft 100 is for lens driving/4
'The driving force of the Luss motor 105 is connected to a set of gears 124.12.
It seems to be transmitted through 5.

Accordingly, as the mirror drive Nolls motor 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 lens unit 54 moves. It often moves a predetermined distance in a predetermined direction. At this time, the mirror drive pulse motor 105 and the lens [driving] #Rusmoke 123
By changing the period of the pivoting pulse of the third optical unit, the amount of movement of the lens unit 54 can be changed to the amount of movement of the lens unit 54. It is set to a smaller value than that. And Lens Uni,... Toe; o To51E 3
Since the third optical unit 54 has a larger change in focus and magnification for the same amount of movement of the optical unit 54, it can be moved slowly to avoid the adverse effects of inertia, and high positional accuracy can be obtained. It looks like this.

The developing device @IS has a configuration as shown in FIGS. 10 to 16. That is, as shown in FIG. 10, it has a developing row 21305 as a first developing body, a second developing body, and 17 developing rows 2131, and these developing rows 2130°13 are selectively driven. For example, it is possible to perform black or red development.

Further, the developing device 4 includes a first developing row 2130.
The first developing unit 132 in the upper stage uses red developer Da, which is rarely used, and the second developing unit 133 including the second developing row 2131 is divided into VC2. 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.

Further, as shown in FIGS. 12 and 13, the first developing unit 132 that uses the red developer Da includes a developing mechanism section 134 and a developer stirring section 135, and includes a developing roller 130 and a developing roller 130. A doctor 137 is provided on the upstream side of the sliding contact portion of the developer magnetic brush Da' formed on the surface of the developer magnetic brush Da' with the photoreceptor 12, that is, the development position 136, and regulates the thickness of the developer magnetic brush Da'; A scraper 139 is also provided on the downstream side of the development position 136 and scrapes off the developer magnetic brush Da' on the surface of the development roller 130 and guides it to the developer storage section 138, and the developer stored in the developer storage section 138 is provided. The stirring bodies 140 and 140 are housed in a casing 141VC.

Further, the first developing roller 130 has a magnetic roll 142 and a slot IJ-fx4s fitted onto the magnetic roll 142. The magnetic roll 1-2 has five magnetic pole parts 144a~
144e, the 1st degree, the 3rd degree. 5th magnetic pole part 144m,
144c, Ii 46 is the N pole, the 2nd. Fourth magnetic pole part 244
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 portion 144c facing the development position is arranged at an angle of about 700° to 1000°.
Gauss, other magnetic pole parts 144*, 144b, 144d, 1
44* has a magnetic force distribution of 300 to 600 Gauss.

Therefore, in the first developing unit 132VC, the rotary sleeve 143 is rotated clockwise in the drawing to develop the image, which is called an advanced mode. By sliding the developer brush Da' held on the surface of the photoreceptor 12,
The electrostatic latent image formed by Vc is developed.

By reducing the diameter of the developing roller 130, 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 wm, the circumference from the exposure position to the transfer position is approximately 122 smL. 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 a developing device with a developing roller 130 having a diameter of 40 mm or less can be installed in a space-saving manner. Further, it has been confirmed that the heights of the first developing unit 132 and the second developing unit 133 are limited, and must be 120 m or less when the drum diameter is 78 m0. That is, 1st. Together with the second developer unit 132, 133, it must be made thinner.

For this reason, advanced mode developing devices are often used, which are advantageous in terms of space in one height direction, have a small number of poles, and are inexpensive in cost. The first thing to be installed at the top of the special trap.

Since the developing device opening of the image unit 132 faces downward, in the quiz mode in which the developer Da flows from the top to the bottom, problems such as the developer Da spilling out occur. In this respect as well, the developing unit 132 of the upper cylinder 1 is
Advent mode is advantageous.

Further, in the first developing unit I32, the developer magnetic brush Da' on the rotating sleeve 143 is removed by the developer removing means 145. As shown in FIG. 12, this developer removing means 145 simply moves the rotating sleeve 143 in the opposite direction (counterclockwise direction) during development.
This is an extremely simple and inexpensive method in which it is removed by rotating it by K.

The rotary sleeve 143 rotates in the opposite direction when copying is completed, and the developer D8 is conveyed in the opposite direction. Therefore, all the developer Da on the rotary sleeve f143 is transferred to the P lid blade 13 as shown in FIG. It is collected between the pipe and the scrape A139.

If the magnetic pole part has five poles, if the first magnetic pole part (carrying pole) 144 & and the fifth magnetic pole part (carrying pole) 1446 are separated from each other, the developer can be transported more efficiently. Since non-conveyance can be controlled, the number of poles is preferably 5 or less.

In addition, an elastic thin plate member (not shown) such as Mylar (trade name) is attached to the Scra-4139 with its tip in contact with the rotating sleeve 143, which prevents the reverse conveyance of the developer Da. It's higher.

Further, the reverse rotation operation of the rotating sleeve 143, that is, the removal operation of the developer magnetic brush DIL 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 power is turned on again, paper jam removal, etc. are taken, and the exposure light R14 optical system, etc. is restored to its initial state, and at the same time,
The reversal is performed again, and the configuration is such that there is no developer Da at least near the development position 136 on the rotary sleeve f143 during the "copyable" state, that is, at the time of resolving. .

However, if the rotating sleeve 143 is small, with a diameter of about 40++ m or less and a width of about 230 m or less, the above-mentioned method of controlling the conveyance and non-conveyance of the developer Da is as follows. In addition to changing the direction of rotation, it is also possible to rotationally displace the magnetic roll 142 via a drive source such as a Lemade so that the first magnetic pole part 144a faces the doctor blade 137 made of a non-magnetic material. It is.

The second developing unit 133, which uses the black developer Db, is composed of a developing mechanism section 146 and a developer stirring section 147, as shown in FIGS. 13 and 14. The developer magnetic brush Db' formed on the surface of the developing roller 131 is provided upstream of the sliding contact portion with the photoreceptor 12, that is, the current position 148.
5. A doctor 149 that regulates the thickness of the blade Db', a guide 151 that guides the developer Db scraped off by the doctor 149 to the developer storage section 150, and the developer storage section 15.
0 and the developer stirring body 152 housed in the casing 15.
The configuration accommodates 3.

The developing roller 13 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 130 to enable high-speed development, and the rotating sleeve 155 is made larger than the first developing roller 130.
is developed by rotating it counterclockwise in the figure, in a so-called with mode, 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. , ensure sufficient development time, and
The electrostatic latent image formed on the image is developed into a high-quality image.

The magnetic roll 154 has six magnetic pole parts 156a to 156f, which is one more than the first developing row 2130, so as to be suitable for the with mode. 4th. Sixth magnetic pole portions 156b and 156d.

156f is the N pole, the 1st. Third. fifth magnetic pole part 156*,
156e and 156* are S poles, and each magnetic pole part 15
6&~156f are arranged at an angle of about 50° to 60°,
The fourth magnetic pole 156d facing the development position is 800 to 10
00 Gauss, other magnetic pole parts 156*, 156b, 156c
, 156@, and 156F have a magnetic force distribution of 400 to 60 (lus).

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, this developer removing means 157 consists of a blade 158 made of an elastic member such as urethane rubber, and a blade moving mechanism 159 that moves this blade 158 in the horizontal direction. By pressing the blade 1511 against the surface of the sleeve 155, 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 163VC is engaged with a ridge 162 provided on a slider 161 integrated with a blade holder 160. Then, by rotating the motor 163 in the forward and reverse directions, the system slider 16) is advanced and retracted, and the blade 158 is brought into contact with the surface of the photoreceptor 12 as shown in FIG. 14, as shown in FIG. Photoreceptor 12
It is designed to be separated from the surface of the

Further, the position of the blade 158 in pressure contact with the photoreceptor 12 exists between the position of the doctor blade 149 and the second magnetic pole portion (carrying pole) 156b. This means that the position of the second conveyor @156b is the most efficient for scraping off the developer brush Db', but when the interval is widened, the blade 1
Since the amount of developer DbO that accumulates between the photoreceptor 12 and the doctor blade 149 increases, the developer Db that has accumulated during the next copy may be scraped off as the photoreceptor 12 rotates, and the inside of the machine may become contaminated. Therefore, the pressure contact position of the blade 158 is set at a position where the amount of developer Db is small and scraping is performed efficiently, that is, between the doctor blade 149 and the second magnetic pole portion 156b.

On the other hand, 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.

Furthermore, the contact operation of the blade 158, that is, the removal operation of the developer magnetic brush Db, is performed not only after the completion of the development operation (after the completion of the copy operation) but also inadvertently, as in the case of the first development unit 132 described above. This is also done after the equipment is stopped. In other words, if the power is turned off or the device suddenly stops due to a paper jam, etc., the power cannot be 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 jammed paper, the blade 1 is turned on again.
58 is performed, and the developer Db is always not present on the rotating sleeve 155 at least in the vicinity of the developing position 1413 during the "copyable" state, that is, during resolving.

Moreover, the first. The 20th developing units 132 and 133 are configured to operate selectively in accordance with designations from a color designation section (not shown). That is, when red is specified, the first developing unit 1 is
In order to form the magnetic plan Da′ only on the rotating sleeve 143 of the second developing unit 133, as shown in FIG.
5 so that the magnetic brush Db/ is formed only on top of the magnetic brush Db/.

When the first developing unit 132 side is designated to be operated, the rotating sleeve 143 of the first developing roller 130 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 D&.

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 reverse direction, and at least the developer Da at the main development position 136 is removed in preparation for the next development operation. In addition,
At this time, the rotating sleeve 15 of the second developing unit 133
The developer magnetic brush Db' is not formed in the developing unit 5 either, so that problems such as color mixing will not occur even if any of the developing units 132 and 133 is designated next.

Further, when the second developing unit and the tonneau 33 side are designated to be operated, the second developing roller 1310 rotation sleeve 155 rotates counterclockwise as shown in FIG.
A developer magnetic brush Db' is formed on the surface of the rotating sleeve 155. In order to cope with high-speed copying, the electrostatic latent image formed in advance on the photoreceptor 12, which is controlled to rotate at high speed, is developed with black developer Db during development by the first developing unit 132. Become.

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 surface of the developer Db, and at least the developer Db at the development position 148 is removed in preparation for the next development operation. Note that at this time, the first developing unit 13
The developer magnetic brush Da′ is not formed in the 20-turn sleeve 143 either, and next, any one of the developing units 132
．． Even if 133 is specified, problems such as color mixing will not occur.

Note that K is set so that the grossing speed is high for black copying, and low for color (red) copying, thereby improving the image quality of color copying.

However, once the black copy was made, the second developing unit was used.)
During development at 1 j J, the circumferential speed of the drum-shaped photoreceptor 12 is 223 wm/s, 35 sheets/min, color copying is performed on A4 size paper, that is, during development at the first developing unit 132, the drum-shaped photoreceptor 12 The circumferential speed of is 136 +w
/s, 25 sheets/minute, variable speed for A4 landscape,
The diameter of the developing roller 2130 is 50 mm of that of the second developing roller 131.
Their stomachs are small (38 cm) compared to the food, so if you allow enough time for development, you can obtain high-quality color images.

Furthermore, black copying, which is frequently used, enables high-speed copying.

In addition, each developing unit 132 configured as described above.
133 has a front cover 17 as shown in FIG.
The developer receiving and conveying sections 132* and 133* protrude in an exposed state when the developer receiving and conveying sections 132m and 133m are opened, and cartridge-type developer replenishing devices 171 and 172 are connected to these developer receiving and conveying sections 132m and 133mVC. It is attached removably. Then, based on the detection signals from the developer empty detectors 1y3 and 1y4 (see Figure 3) that detect the amount of developer (toner amount) in the developer storage section 138°J50, the amount of development corresponding to the amount consumed is determined. The configuration is such that the agents Da and Db are replenished as appropriate.

Developer replenishing device 17 on the second developing unit 133 side
2 is constructed as shown in FIGS. 18 to 20. That is, 176 is a container that stores the developer T)a, and a transfer screw 17 is provided at the bottom of the container 175 to transport the developer Db in the axial direction by being rotationally driven.
6 is stored.

Further, at the lower part of one end of the transfer screw 176 of the container 175 located in the developer transfer direction, there is a holder 17 as a mounting section connected to the developer receiving and conveying section 133a.
A fitting protrusion 175 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 175m.

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

Further, one end of the transfer screw 176 has the holder 1
It has a connecting portion 176a that protrudes from the end surface of 72 and connects to the driving force lug ring 181 of the driving device 180.

A developer discharge port 17 is provided on the lower surface side of the fitting protrusion 1751.
An i body 183 is provided so as to be slidable to open and close g. ! 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 175 is inserted into and removed from the holder 177, as shown in FIG. 20(a),
As shown in (b), a lid 183 slides to open and close the developer discharge port 180.

In addition, as shown in FIG. 17 and VT18, the driving device 180 has the force, ! Gear 1 integrated with ring 181
86, and a worm gear 187 that meshes with this gear 186.
A movable pace 190Vc, which has a motor 188 for driving the worm gear 181 and is slidable in the direction of arrow F in FIG. 18, is attached.

Thus, the motor 188 is driven for a predetermined period of time by the detection signal from the above-mentioned phenomenon agent hardness detector 174.
Transfer screw 126 rotates.

From this K, the developer Db in the container 175 is sent to the developer discharge port 178 side, and is sent to the replenishment port 179 of the developer receiving and conveying section 133a. Next, the developer Db sent into the replenishment port 179 of the developer receiving and conveying section 133&
As the developer transport shaft 182 rotates, the developer storage section 15
It is carried upward within 0.

On the other hand, the developer surrounding the developer transport shaft 182 is disposed at the bottom of the id 200 through developer discharge ports 201h to 201h.
1h are provided at certain intervals La to Lg, and the pressure is such that the developer is distributed over substantially the entire axial direction of the developer stirring body 152 provided in the developer storage section 150. The intervals La to Lg between the developer discharge ports 201a to 201h are as follows:
The opening area of the developer discharge ports 201* to 201b is larger in the developer transport direction, and the developer D
b is evenly distributed.

In addition, when removing the force-tridge type developer replenishing device 172, such as when the developer Db runs out, first move the drive device 180 to the right in the state shown in FIG. Connection part 1 of transfer screw 176
The engagement operation between 76a and coupling 181 is released.

Next, the entire developer replenishing device 172 is rotated toward the front about the holder 177, and then the fitting protrusion 175a is pulled out from the holder 177 by pulling toward the front.

Furthermore, when installing a new developer replenishing device 172, it is sufficient to perform the procedure in reverse order.

On the other hand, the developer replenishing device 171 on the first developing unit 132 side has approximately the same configuration as the developer replenishing device 172 on the second developing unit 133 side, as shown in FIGS. 18 and 19. There is. That is, 210 is developer D
The container 210 houses a transfer screw 211 at the bottom thereof which is rotated to transfer the developer DLL in the axial direction.

In addition, at the lower part of one end of the transfer screw 211 of the container 210 located in the developer transfer direction, there is a holder 212 as a mounting section connected to the developer receiving and conveying section 133&.
A fitting protrusion 210a is formed which can be inserted into and removed from the fitting projection 210a. 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 210*.

Further, the holder 212 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 214 is formed on the bottom surface thereof corresponding to between the developer stirring bodies 140 and 140 exposed from the spiral shaft. It becomes.

Further, the holder 2 is attached to one end side of the transfer screw 211.
It has a connecting portion 211 & that protrudes from the end surface of the drive device 12 and connects to the drive 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 the engaging protrusion 2I7& formed on the lid body 217, and the fitting protrusion 218 is formed on the holder 212 side.
When the ZOm is inserted or removed, the lid 217 is shown to slide to open and close the developer discharge port 213 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 222 that is slidable in the direction of arrow G in FIG.

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

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.

As a result, the developer Da in the container 210 is sent to the developer discharge port 213 side, and is sent to the replenishment port 214 of the developer receiving and conveying section 132&. Next, the developer Da fed into the replenishment port 214 of the developer receiving and transporting section 132m
is uniformly distributed to the developer storage section 138 by developer agitators 140 and 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, it is necessary to first displace the drive device 215 in the right direction in the figure in the state shown in FIG. 211 connecting part 2
11& and the coupling 216 are released.

Next, after the entire developer replenishing device 171 is rotated toward the front about the holder 212, the fitting protrusion 210a is pulled out from the folder 212 by pulling toward the front.

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, and a transfer screw 176 is attached to the periphery of one end surface of the stirring body 225 to transfer the developer Db to the developer discharge port 178 side. A plurality of claws 227 are provided to protrude and engage with the attached streak rocket 226. As the transfer screw 176 rotates, the stirring blade 225 rotates, thereby preventing the developer Db in the container 175 from clumping or shifting, thereby ensuring that the developer Db can be reliably supplied without remaining. There is.

On the other hand, similarly, inside the container 210 containing the developer Da,
The stirring blade is housed, and is configured to stir the developer Da in the container 210 by applying the same pressure.

Incidentally, reference numeral 228 shown in FIG. 17 is a collection index for collecting the developer scraped off by the cleaning device 18, and it can be easily removed by opening the front cover 170. Moreover, 229 is a mognet catch for holding the 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, a paper feed cassette containing paper P...
The door, IJ, and 9 are each attached to the upper surface of the spacer 240 via an id (not shown) so that they can be inserted and removed.

As shown in FIG. 25, each of these paper feed cassettes 7, 8, 9 has guides 241, 242*, 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. In addition, through holes 245 and 245 are formed in the paper support plate 243, and the paper support plate 245 at the bottom of the cassette body 244
An opening 246 is formed at a position corresponding to .

Further, the cover 10 of the paper feed cassette 7 in the uppermost stage constitutes a manual paper feed tray 11 as shown in FIG. A pair of guide members 247, 247 are provided. These pair of guide members 247, 247 are attached to the cover 10 as shown in FIGS. 27 to 29, and when one of the guide members 247 is moved, the stone and the other guide member 247 are interlocked. It is supposed to move.

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

Therefore, when one guide member 247 is moved along the width direction H, the other guide member 247 is interlocked with this and slides toward or away from each other. i.e. binio/248 and rack 249
This constitutes interlocking means for interlocking both guide members 247.

Since the pins 250 and 251 are inserted into the corresponding guide slots 252 at intervals as shown in FIG.
The rack 249 is thereby guided to move along the width direction H. In addition, on both sides of the pinion 248, guide bins 256 are protruded from the cassette body 10VC, and the rack member 249 is guided and held by the back surface of the corresponding rack 248 to prevent it from coming out of mesh with the pinion 248. are doing.

In the figure, reference numeral 257 denotes a guide reinforcing plate attached to the back surface of the cover 10 by appropriate means, and is provided in the width direction along the travel 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 IQ.

Further, the pivot shaft portion 2 rotatably supports the −ion 248.
58 is provided protruding from the back surface of the cover 10 as shown in FIG. There is. The left and right pair of cut-and-raised tongues 259&, 259& of this brake member 259 are bent and elastically frictionally engaged with the outer peripheral edge of the pinion 248, and both ends 259b of the brake member 2590.

259b is bent at right angle and has a cutout (
(not shown) is engaged with the guide pin 256°256. Therefore, the pinion 248 is connected to the braking member 259
Since the tongue pieces 259* and 2591L receive a slight braking effect on the rotational movement, blind movement such as excessive rotation 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 due to the inertia of each moving member or positional shift due to vibration.

In addition, each paper feed cassette, door, each paper support plate 243 of 8.9
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 lever 264 and the actuating lever 262 are attached with their phases shifted by 80 degrees. Further, the operating lever 267Vc is connected to a spring 268), and is biased so that the lower surface of its free end is always in contact with the circumferential surface of the eccentric cam 269.

The eccentric cam 269 sequentially meshes gears 270°271.2
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 261
is pushed up against the biasing force of the spring 268 (
The state shown by the solid line in FIG. 30) is reached, and the least eccentric portions face each other, so that the actuating lever 267 is pulled by the force of Sgeling (the state shown by the 301st chain double-dashed line).

Accordingly, with this movement, the push-up lever 264, which is in an integral relationship with the operating lever 267 via the shaft 266, is also rotated to the state shown by the solid line or the two-dot chain line in FIG. The sheets P... accumulated on the take-out roller 243 are separated from the take-out roller 265 and come into contact with the take-out roller 265.

Further, as shown in FIG. 24, in the paper take-out direction of the take-out row 2265, there are rows 2289 and 290 that roll into contact with each other as a separating means 288 that separates the second and subsequent sheets of paper P that have been picked up and prevents them from being taken out. 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
1 is in mesh 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 cracker and a chi 296 in the middle.
It has a configuration that works with 0.

Further, the spring clutch 296 has a low 2289
, 290 is set to slip when the force at the contact portion exceeds T&. Further, if the frictional force between the rows 2289 and 290 is Tb, it is set to be T&)Tb, and the roller 289 is configured to rotate according to the roller 290.

In addition, the frictional force between the paper P and the paper P is Tf, and the roller 26
5. If the frictional force with the paper P is Tr, generally the roller 2
65 is Tr)Tf because it is molded from a material with a high coefficient of friction such as rubber. And Ta is Tr ) Ta
) Tf.

Thus, during paper feeding standby, the paper P is in a state away from the take-out row 2265, as shown in FIG. 23(,). During paper feeding, as shown in FIG.
Then, as the take-out row 2265 rotates, the uppermost sheet P is taken out and sent between rollers 289 and 290 forming the separating means 288.

'-No. 2 The second and subsequent sheets of paper P that have been taken out by adsorption to the topmost paper P are separated by the reverse rotation of the roller 290 as shown in FIG. Only the paper P of is taken out. This means that paper P is on roller 289
．． 290, the roller 289 moves the paper PftTr>T
from fK in the direction of arrow J, and roller 290 and paper P.
... is returned in the opposite direction from Tr) Ta) Tfic.

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

Further, as shown in FIG. 33, at a position corresponding to the bottom side of the paper feed cassette 7°8.9 and a position corresponding to the paper conveyance path immediately before the separating means 288, there are paper sheets connected to a control section (not shown). Reflective optical sensor 300 as a detector.
301 is provided. And these two sensors 30
The sum of the "no paper" detection signals of 0°30 constitutes a paper no detection means 302 that determines that there is no paper J.

When the paper P is placed on the paper support plate 243 as shown in FIG. 33(a), it is possible to detect when the paper support plate 243 is lowered.
As shown in FIG. 33(b), if the last sheet separated by the row 2290 is held between the rollers 2B9, 290, it corresponds to the bottom side of the paper feed cassette 7 (8, 9). This cannot be detected by the sensor 300 provided at the position where the separation means 288 is located, but it is possible to detect this by the sensor 301 provided at the position corresponding to the paper conveyance path immediately before the separating means 288. Therefore, even though there is paper P,
This prevents a determination that the paper is out of paper.

In addition, a reflective optical sensor 300.3 is used as a paper detector.
By using 01, paper P can be detected in a non-contact state, and compared to using a transmission type optical sensor, it has the advantages of being less affected by external light and being easier to install. There is.

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 V-no roller pair 24.
It is brought into contact with the contact portion between a and 24b, and after the inclination (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 305b of the transfer roller pair 305, and the rollers 24g of the registration roller pair 24 are configured to be driven via a power transmission system 306 shown in FIG. .

That is, 307 in the figure is a pulse motor as a driving means, and a driving gear 308 attached to a driving shaft of this motor 307 is in mesh with a gear 31Q via an intermediate gear 309.

The gear 310 is one of the rollers 24 of the registration roller pair 24.
It is attached to the shaft of & via a one-sided clutch 31.

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.
It is configured to work in conjunction with Suge Rocket 315, which is integrated with 14.

315 is attached to the shaft of the transfer roller 305b via a one-sided clutch 319, and a gear 314 is attached to the shaft of the transfer roller 305b. Gear 314 further includes intermediate gear 316 .
317 are successively valved to mesh with a gear 318 attached to the shaft of the take-out roller 265.

Therefore, when the motor 307 rotates forward (in the direction of the solid line arrow), the one-way clutch 311 is turned off, and the one-way clutch 311 is turned off.
315 is turned on, the take-out roller 265 and the roller 305b are driven, and no power is transmitted to the roller 24&, resulting in a stopped state. Additionally, when the motor 307 rotates in the reverse direction (in the direction of the dashed arrow), the one-way clutch 311
is on, the one-way clutch 315 is off, and only the rows 224& are driven, and the rollers 305b and 26
5 is in a stopped state with no power being transmitted due to the action of the one-way clutch 319.

In this way, the configuration is such that the take-out roller 265 and one row 224IL of the reno roller pair 24 are selectively rotated by the forward and reverse rotation of the pulse motor 307 as a driving means.

Further, in the uppermost paper feed cassette installation section, a manual feed roller 321 is provided that sequentially takes out the sheets P set in the manual feed tray 11 one by one and sends them to the separating 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 be able to freely approach and separate from the paper conveyance path, and at least when manually feeding paper, the take-out roller 265 is separated from the paper conveyance path.

That is, the spindle 265a of the take-out roller 265 is attached to and supported by the free ends of arms 323, 323 which are rotatable about the spindle 289& of the roller 289 of the separation means 288 as a fulcrum. Also, the manual feed roller 32 is replaced by the take-out roller 26.
The arm 324 is rotatable around the support shaft 265a of No. 5 as a fulcrum.
, 324.

In addition, the free ends of the arms 324 and 324 are integrally provided with latching protrusions 342a that are perpendicular to each other, and these latching protrusions 742a.

342a is a lever 327.32 attached to a rotating member 326 rotatably supported around a supporting shaft 325;
7 and extends upwardly from 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
4m has been lifted.

Further, the rotating member 326 includes a plunger type lunoid 32.
The nine plungers 329a are connected via a connecting member 330, and the rotating member 326 can be rotated against the biasing force of a spring 328.

Note that 331 in FIG. 24 is a manual paper feed switch arranged in front of the manual feed roller 321. Also, the 35th
As shown in the figure, a sedge rocket 332 is attached to the spindle 265a of the take-out roller 265, and a sedge rocket 333 and a spindle 321 of the manual feed roller 32 are attached.
The traps are interlocked with each other via a chain 334.

When the paper P is placed on the paper feed table 11, the manual paper feed switch 331 is turned on, and the start is turned on by turning the button 30 on. Soshi°C1
The rotating member 326 rotates against the biasing force of the spring 328, and as the manual feed roller 321 lowers, the take-out roller 265, which is a perfect circular roller, moves upward away from the paper conveyance path. Displace.

Then, when the paper P is sent to the separating means 288, the lunoid 329 is turned off, the manual feed roller 32 is raised, and the take-out roller 265 is accordingly lowered.

At this time, the push-up lever 264 that pushes up the paper support plate 243 of the paper feed cassette 7 is in a lowered state, and the paper P
The take-out roller 265 is also separated.

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 331.

Upper Roller Units) J36Fi, a heat roller 338 that houses a heat source (not shown) inside and has a Teflon coated outer surface is attached to a bracket 340 that is rotatably supported via a support shaft 339. It is planted.

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 guide shafts 344, 344 are inserted, and can move up and down within the circumference of the elongated holes 345.

A movable frame 346 is provided near the free end side of the bracket 340 of the upper roller unit 336. 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 (Ill
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 platen 340, and the heat roller 338 is attached to the compression spring 342. A trap is formed so that the pressure roller 341 is brought into contact with the pressed down state against the force 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.
As shown by al, the bracket 340 is configured to be able to rotate by a maximum of 95 degrees using the support shaft 339 as a rotation fulcrum. Note that such a configuration makes it easy to replace the heat roller 338 and the pressure roller 341.

Next, the paper P ejected from the paper ejection unit 22 of the image forming apparatus 1 configured as described above is received (receiving the paper P ejected from the paper ejection unit 22 of the image forming apparatus 1 configured as described above), and then returned to the image recording apparatus 1 in the same state or with the front and back reversed.
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 riL2 is composed of a unit independent of the image recording device 1, and also serves as a mounting table on which the image forming section #1 is removably mounted.

This direction conversion conveyance device 2 is a discharge section 2 of an image forming apparatus 1.
f-id means 350 which is provided near 2 and which guides the ejected paper P as necessary;
A carry-in path 35 for carrying in the paper P guided by the IC;
A temporary stacking section 352 that temporarily stacks the sheets P carried in through the paper input path 351, a take-out means 353 that sequentially takes out the sheets P accumulated in the temporary stack 352 one by one, and a temporary take-out means 353. In order to form a multiple image on the taken out paper P, the paper introduction section 3 as an image recording body introduction section of the image forming apparatus 1 is operated again without changing its leading edge direction.
54, and a first transport section 355 that leads to the first transport section 3.
55, and the extraction means 353
a second conveying section 356 that converts the Ic conveying direction so that the trailing edge becomes the leading edge in order to form a double-sided image on the sheet P that has been taken out, and guides the sheet P again to the sheet introduction section 354 of the image forming apparatus 1; This second transport section 356 and the first transport section 35
5, a sorting means 351 that selectively distributes the sheets P taken out by the taking out means 353, and a motor switching getan 33 as an operation section of the image forming apparatus 1;
The guide means 3 receives multiplexed and double-sided switching signals from
50, drive means 358, 3 for switching the distribution means 357, etc.
59.

The guide 9 means 350 consists of a gate 362 rotatably provided by a support shaft 361, and this r-toe 36
2 is a straight conveyance path 365 that passes through the paper ejection section 22 of the image forming apparatus 1 and the paper ejection roller pair 363 and reaches the paper ejection tray 364;
It is provided at a branch of the carry-in path 366 leading to the temporary stacking section 352, and is driven by a driving means 358 to selectively guide the sheets P. 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 linear conveyance path 365 is in the "open" state. Further, a solenoid 369 is connected to the gate 362 via a connecting member 378, and a solenoid 369 is connected to the entrance path 362 as needed.
The gate 362 can be rotated against the biasing force of the spring 361 in order to open the line 66 and close the linear conveyance path 365.

In addition, a first conveying roller pair 370 is provided in the carry-in path 366.
．． Second conveyance roller pair 371, third conveyance roller pair 37
2 is arranged so that the paper P is forcibly fed into the temporary stacking section 352. Note that the third conveying roller pair 372 is configured to be able to freely move the receiving and discharging position of the paper P in the feeding direction of the paper P, as will be described later.

Regardless of the size of the paper P, the leading end thereof can be adapted to the ejection means 353 provided in correspondence with the button at the end of the temporary stacking section 352 in the ejection direction.

Further, the temporary stacking section 352 is constituted by the upper surface portion of the guide plate 373, and the actuator 374h of the paper detecting means 314 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.
From υ, this take-out roller 377 is displaced upward Ka when the paper P is temporarily stacked in the collection section a 352 so as not to interfere with the stacking of the paper P.

That is, the pivot end side &C of the arm 376 is formed with a protrusion 376m that comes into contact with the lever 378 that rotates using the solenoid 328 as a drive source.
78, the roller 377 that takes out the protrusion 326a is displaced upward as shown by the solid line in FIG.
As a result of the roffJ operation, the take-out roller 377 moves downward under its own weight as shown by the two-dot chain line in FIG. 37, and rolls into contact with the sheets P accumulated in the temporary accumulation section 352.

Further, a pair of conveying rollers 380 consisting of rollers J 8 (7a + 3110b) is provided in the paper taking out direction of the taking out means 353 configured in this way,
The paper P taken out from 52 is fed into the sorting means 357.

Next, the configuration of the direction changing portion of the paper P taken out from the temporary stacking section 352 and fed through the pair of conveyance rollers 380 will be explained with reference to FIG.

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 384 that is provided in communication with the first conveyance path 382 and includes a pair of conveyance rollers 383 as a second conveyance means. and a third conveyance path 386 that branches from the terminal end of the first conveyance path 382 and is provided with a pair of conveyance rollers 385 as a third conveyance means, and this third conveyance path, ? s t
; K is configured to have a fourth conveyance path 387 branched from the base end of the second plaster conveyance path 3840 in a state where they merge.

) X et al., the first conveyance path 382 and the third conveyance path 38
The first
The paper P fed Fa through the conveyance path 382 is transferred to the second conveyance path 3.
A first guide means 388 that selectively guides the conveyance j78J #6 of #84 or #'1WfJ3, and a second conveyance means provided at the branching point between the second conveyance path 384 and the fourth conveyance path 387. , 183K, and a second guide slave 389 for guiding the paper P reversely fed through the second conveyance path 383 from 183K to the fourth conveyance path 387 side, the sorting means 352 is moved from t4 to hK. are doing.

In addition, the second conveyance path 384 includes the first conveyance path 38.
Detecting that the trailing edge of the paper P guided from 2 to the second conveyance path 384 has reached the fixed position 17, the conveyance roller pair 383
paper detection means 39 that controls the paper P to be conveyed in the reverse direction.
0 is set.

And the above-mentioned 1. By switching the second guide means 388 and 389, the paper P transported through the first transport path 382 can be transported without changing its leading edge in the transport direction, and the trailing end in the transport direction becomes the leading edge side. After changing the conveyance direction to
The structure is such that it can be sent to the 5th station.

In addition, the above-mentioned No. 1. Second guide means 388°3119F
i. Plunger solenoid 3920 Grand Tsuya 3 which is pivotally supported via the support shaft 39 and serves as a driving device.
It is composed of guide members connected to each other through connecting members 393 and 393, respectively, and the o
By the n*oN operation, K is rotated as shown by the solid line or the two-dot chain line in FIG.

Next, the operation during double-sided copying will be explained.

(al First, operate the mode switching button 33 on the operation panel 6 to specify "duplex mode" and set the number of sheets, exposure, magnification, etc. using separate operations, then press the start button (
Glint Detan) Press 30.

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

(el The paper P that has been copied on one side is stored in the temporary stacking section 352.
are accumulated in

(dl Solenoid 396 of guide means 350 returns.

(s) Replace the original, set exposure, etc., and press 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 371 is lowered.

('') Take-out cooler 377, conveyance a that also serves as separation means
-5 pair J80, and conveyor roller pair (switch no 4
(pair of rollers) 383 rotates.

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

(11 The transport roller pair 3110 stops when the leading edge of the paper P reaches the transport roller pair 383 sufficiently. (However,
The transport port 6-ra pair 380 is equipped with a one-way latch and is rotated by the paper PK until the rear end of the paper P pulled by the transport roller pair 383 separates. ) fj) When the trailing edge of the paper P passes 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
), the transport roller pair 3113.385 stops and aligns the paper P.

(1) When the paper P is sent to the image transfer section 21 and the trailing edge is separated from the distribution means 351, the solenoid 392 of the distribution means 357 returns.

(However, roller 3B5g+3 of conveyance roller pair 385
Reference numeral 85b has a one-way latch and is rotated by the paper PK pulled by the aligning roller pair 24Vc. ) - 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 in step 11 will be repeated.

Next, the double copy/temporary operation will be explained.

(al First, change the mode on the operation panel 6 d?Methane 3
After specifying "double mode" by operating , and setting the number of sheets, exposure, magnification, etc. using separate operations, press start button 30'.

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

(e) One-sided copied paper P is temporarily stored in the stacking section 352.
are accumulated in

(The solenoid 396 of the dl ff id means 350 returns.

(s) Replace the original, set exposure, etc., and press start button 30.

(fl) The renoid 378 of the take-out means 353 that has been thrown into the temporary accumulation section 352 is pulled, and the take-out roller 377
descends.

Excellent) The 7lenoid 392 of the sorting means 357 is pulled, and the take-out roller 3179 is moved to the conveying roller pair 380 which also serves as the separating means.
And the conveying roller pair (feed roller pair) 385 rotates.

(h+) When the leading edge of the paper P has sufficiently reached the pair of transport rollers 380, the take-out 0-ra solenoid 328 returns and the take-out roller 377 rises.

(g) The pair of conveying rollers 380 stops when the leading edge of the paper P reaches the pair of conveying rollers 385 sufficiently. (However, the transport roller pair 3801' and Image transfer unit 21 of ear device 1
Aligning roller pair 24 located in front of (when reached, transport 1 roller pair 385 stops, and after aligning sheet P, sheet P is transferred to transfer section 2) IC.

Long) With the guide means 35[theta] in the returned state, the operations of (fl~('') are repeated until there are no more single-sided copied sheets in the temporary stacking section 352.

Furthermore, if necessary, the paper P ejected from the paper ejection section 22 of the image forming apparatus 1 is received, and the image recording apparatus J
Since the image transfer unit 21KM as an image forming unit of As shown by the chain line, a stone member located on one side (lower side) K of the paper P passage section is arranged outward (lower side) [2nd place] in order to open the paper passage path.

That is, the guide plate 400*, which forms part of the general entrance path 366, below the ID plate 400a, the lower roller 371a of the transport roller pair 371m, 171b, and the guide plate 373 that constitutes the temporary accumulation section 352. and @1. lower guide plate 40 that constitutes the transport path 3FL2, 383 of the bamboo grass 2],
Conveyance roller pair? 80 m +380b lower roller 3
80%% conveyor roller pair 38.1 &.

Lower end of 383b - Conveying direction of 538, 1 & creeping paper P -
With the side as a fulcrum, they are freely provided and attached to the support frame 402, and are configured to be able to be displaced outward all at once to open the paper passageway as the support frame 402 moves. ing.

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, 403, the paper conveying section can be opened, and paper jams and the like can be easily dealt with.

Further, as shown in Figs. 39 to 41, the carrying means that receives the sheets P that are sequentially conveyed and sends them to be accumulated in the temporary stacking section 352 is movable in the feeding direction of the sheets P. There is.

That is, the carrying-in means consists of the carrying roller pair 372, which has a drive opening roller 3721 as a second carrying roller and a driven roller 372b as a second carrying roller.

Drive roller J72alj% Slit 4 as guide part
The driven roller 372b has a supporting shaft 407 which is movably supported horizontally by holding a bearing (bush) 406 at 05, 405, and the driven roller 372b
A drive roller 372 is used to sandwich and transport the paper P between
It is provided so as to be in continuous rolling contact with the drive roller 372a and is movable integrally with the drive 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 path in between.
, 408, respectively.

Further, the bearings 406, 406 held by the slits 405, 405 are fixed at predetermined positions according to the size of the paper P by positioning means 409, 409 provided on the outside of the frames 408, 4011. It looks like this.

Furthermore, each positioning means 409 is provided along the movement path of the bearings 406, 405, as shown in FIGS. The structure includes a lever 411 as a positioning member having a diameter of .410. This lever 411 has one end rotatably attached to the frame 408 via a shaft 412, and a spring serving as a biasing member that constantly biases the concave portion 410 to the bearing 406KPfjj on the free end side. 413 are in a connected state.

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.
This plate spring is attached to the drive roller 372a and urges the driven roller 372b toward the drive roller 372a.

Therefore, when setting the transport roller pair 4θ7 for feeding the paper P to the temporary stacking section 352 at a position corresponding to the size of the paper P, both levers 411 must be rotated against the biasing force of the spring 413. The movable frame 414
the bearings 406, 406 into the predetermined recess 410.
It would be a good idea to fit them together. In this way, the transport roller pair 407 can be moved extremely easily to a position that matches the size of the paper P without using a tool such as a driver, and the paper P can be neatly accumulated in the temporary stacking section 352 in a removable state. I can do it.

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. The device (sorter) is a trap so that 42 pieces can be used.

In the large-capacity sheet feeding device #420, the movement of an elevator plate 424 that can be raised and lowered is controlled by a lifting means 423 using a motor 422 as a driving source so that the uppermost sheet P is always in rolling contact with a take-out roller 425. The configuration is such that as the take-out roller 425 rotates, the uppermost sheet P is taken out 1:xI times. Further, the taken out paper P is guided by guide plates 426 and 427 provided in the conveying part 420a to the taking out roller 265 arranged in the cassette mounting part, and then guided to the aligning roller pair 24 via the separating means 288. It's like K.

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

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

Said shutter member 4291-4. It 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 +A opening 432 formed at the bottom of the conveying section 420*.

The arm 431 is urged by a sliding ring 433 to a state where it is always in contact with the stop A 434, that is, to a position where the shutter member 429 does not close the opening 432.

Further, a solenoid 34 is provided on the pivot end side of the arm 43.
5 are connected, and by turning on the solenoid 345, the arm 43 is connected to the spring 43.
It is possible to displace the member 429 against the urging force of No. 3 so that the member 429 of No. 7 can be opposed to the opening 432.

Although the stacking and take-out device of the present invention has been described with reference to the case where it is applied to the temporary stacking section 352 of the direction changing and conveying device 2, it can be applied to other devices as long as paper sheets of different sizes are stacked and taken out. It's okay.

In addition, although the configuration has been described in which the conveying roller, which is the carrying means, is fixedly supported in two stages, if there are three or more sizes of paper sheets to be handled, it may be arranged in three or more stages.

Other 1 It goes without saying that the present invention can be modified in various ways without departing from the gist of the present invention.

〔Effect of the invention〕

As explained above, according to the present invention, the paper sheets that are sequentially conveyed are sent to the temporary stacking section via the carrying means and are once stacked, and the stacked paper sheets stacked on the temporary stacking section are In the paper sheet accumulation and take-out device in which the paper sheet is taken out one by one by the take-out means, the paper sheet receiving and unloading position of the carrying-in means is movable in the paper sheet feeding direction. It is possible to provide a paper sheet stacking and unloading device that allows the loading means to be set in a position according to the size of paper sheets such as image recording media through extremely simple operations, and that allows paper sheets to be stacked and retrieved in an orderly manner regardless of size. such as. Show your strength.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of an image forming unit device that employs the paper sheet stacking/retrieval device of the present invention, FIG. 2 is a schematic longitudinal sectional front view, and FIG. 3 is a schematic longitudinal sectional front view of the image forming apparatus. FIG. 4 is a plan view of the operation panel, FIG. 5 is an explanatory diagram of the configuration of the exposure optical device, FIG. 6 is an explanatory diagram showing the cooling air conduction path, and FIG. 7 is the first section of the exposure optical device. FIG. 8 is a perspective view showing the operating means of the second optical unit; FIG. 8 is a diagram illustrating the configuration of the main parts; FIG. 10 is a schematic vertical sectional side view of the two-color developing device; FIG. 20 (at) and FIG. 22 is a schematic sectional view of the developer replenishing device. FIG. 23 is a schematic plan view of the developer replenishing device. Figure 24 is an exploded perspective view, Figure 24 is a schematic front view of the paper feed unit, Figure 25 is a perspective view of the paper feed cassette with the cover removed, Figure 26 is a cassette cover that also serves as a manual paper feed stand. FIG. 27 is a diagram showing the installation and support state of the guide member of the manual paper feed tray; FIG. 31 is a schematic perspective view of the support plate push-up mechanism; FIG. Figure (a
) ~ (dl is an explanatory diagram showing the paper separation state of the separating means, Figure 33 (al l (bl is an explanatory diagram showing the arrangement state of the paper non-detector in the paper feed cassette installation part, and Figure 34 is an explanatory diagram showing the arrangement state of the paper-free detector in the paper feed cassette installation part. FIG. 35 is a schematic plan view showing the configuration of the roller approaching/separating means for approaching and separating the manual feed roller. FIGS. 36 (al) and (b) are the configuration of the fixing device. FIG. 37 is a schematic longitudinal sectional front view of the direction changing conveyance device, FIG. 38 is a front view showing the structure of the sheet sorting section of the direction changing conveyance device, and FIG. 39 is a direction changing conveyance device. FIG. 40 is a partially cutaway front view showing the structure of the paper carrying section to the temporary stacking section of the device; FIG. 40 is a perspective view of the main parts of the paper carrying section; FIG. The figure is a schematic longitudinal sectional front view of an image forming unit device in which a large-capacity paper feeder is installed in place of the lowest paper feed cassette, a collation device is installed in place of the paper ejection tray, and FIG. 43 is a conveyance of the collation device. FIG. 44 is a side view of the signal generation control means. 2. Direction changing conveyance device, 351. Carrying means, 3.
52... Temporary accumulation section, 353... Retrieval means, 37
2a... Drive roller (conveyance roller), 372b...
Driven roller (conveyance roller), 405... slit, 4
06... Bearing, 407... Support shaft, 408... Side frame, 409... Positioning means, 410...
Recessed portion, 411...positioning member (lever), 412
... Shaft, 413 ... Biasing means (sgeling), 41
4...Movable frame, a15... Leaf spring. Applicant's Representative Patent Attorney Takehiko Suzue Figure 1 Figure 7 Figure 8 Figure 96 Soko Figure 11 Figure 12 Figure 13 Figure 19 Figure 20 (a) (b) Figure 26 Figure 27 Figure 28 Figure 30 Figure 316 Figure 32 (a) (b) Figure 32 (c) Figure 33 Figure 34.
Figure 5Figure 43Figure 44Figure 4al JUU Procedures Amendment (Method) 1, Case Indication Japanese Patent Application No. 59-220503 2, Name of Invention Paper Sheet Accumulating and Retrieving Device 3, Person Making Amendment Case and Relationship Patent applicant (307) Toshiba Corporation 4, Agent No. 17 Mori Building, 1-26-5 Toranomon, Minato-ku, Tokyo February 26, 1985 6, Subject of amendment

Claims (5)

[Claims] (1) The paper sheets that are sequentially conveyed are sent to the temporary stacking section via the carry-in means and are once stacked, and the stacked paper sheets accumulated in the temporary stacking section are taken out one by one by the take-out means. 1. A paper sheet stacking and discharging device characterized in that a paper sheet receiving and discharging position of said carry-in means is movable with respect to a paper sheet feeding direction. (2) The carry-in means includes a first conveyance roller having a support shaft that is movably supported horizontally by holding a bearing with a guide section provided to sandwich the paper sheet conveyance path, and this first conveyance roller. a second conveyance roller which is provided so as to be in constant rolling contact with the first conveyance roller and which is movable integrally with the first conveyance roller in order to sandwich and convey paper sheets; and a bearing held by the guide section. 2. The paper sheet stacking and retrieval device according to claim 1, further comprising positioning means for fixing the paper sheet at a predetermined position according to the size of the paper sheet. (3) The guide part consists of slits formed in a pair of side frames facing apart from each other with the paper sheet conveyance path in between,
3. The paper sheet stacking and taking-out device according to claim 2, wherein the bearing is movable along the longitudinal direction of the slit. (4) The positioning means includes a positioning member that is provided along the movement path of the bearing and has a plurality of recesses that can fit into a part of the outer periphery of the bearing, and a positioning member that has a plurality of recesses that can fit into a part of the outer periphery of the bearing, and a positioning member that has a plurality of recesses that can fit into a part of the outer periphery of the bearing. 3. The paper sheet stacking and taking-out device according to claim 2, further comprising a biasing member that always biases the paper sheets in a predetermined direction so as to align the paper sheets. (5) Claim 2, characterized in that the first conveyance roller is a driving roller and the second conveyance roller is a driven roller.
The paper sheet accumulation/retrieval device described in Section 1.