JPS61226763A - Image forming device - Google Patents

Abstract

PURPOSE:To simplify wiring and to transmit main display elements to a user by providing a character display device in an operation panel and using it to display three main display elements of copy magnification, a message, and the quantity of copies. CONSTITUTION:A display part 456 for displaying three transmission elements indicating copy condition, the state of a copying machine, and an operation indication to a user is arranged on the operation panel. A microcomputer 610 for display control interchanges data with a microcomputer 611 for main body control and the computer 610 selects drivers 612... on the basis of the display data to display characters on a display tube 46. Left four digits (615) are used to display copy magnification, center 31 digits (614) are used to make a message display, and right 3 digits (615) are used to display the quantity of copies, thus displaying three main display elements on one display tube. Consequently, the wiring is simplified and the user knows the main display elements at a glance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image forming apparatus such as a copying machine, and particularly to a display on an operation panel thereof.

[Technical background of the invention and its problems]

Generally, the three main display elements of a copying machine, including the copy magnification, message, and number of copies, are arranged on the operation panel of the copying machine (for example, as shown in FIG. 45. In FIG. 45, 501 is a message 502 is a display state block, 503 is a magnification block, 504 is a paper selection block, and 505 is a numeric keypad block.

The message block 5011 magnification block 503,
The three blocks of the numeric keypad block 505 include the three main display elements described above, and are distributed over the entire area of the operation panel. For this reason, there is a drawback that the user has to search the entire area of the operation panel for the ζ2 main display element when copying. Furthermore, the electrical drive circuits are also separated, making the wiring complicated.

[Purpose of the invention]

This invention was made in view of the above circumstances,
The objectives are: 1) The electronic drive circuit can be placed centrally, wiring can be simplified, and the display is equipped with a display that can convey the main display elements to the user at a glance. An object of the present invention is to provide an image forming apparatus.

[Invention Fence Key]

That is, in this invention, in order to achieve the above object, a character display is provided in the operation panel, and this character display is used to display three main display elements: copy magnification, message, and number of copies. This is how it was done.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.
1 Qjru. FIG. 2 shows the external appearance of an image forming unit according to an embodiment of the present invention, and FIG. 3 is a schematic longitudinal sectional front view thereof. In the figure, 1 is a copying apparatus as an image forming apparatus, and 2 is a It also serves as a mounting table on which the copying device 1 is placed.

If necessary, the paper P as an image recording medium discharged from the discharge section of the copying device 1 is removed, and the paper P is fed again as it is or with its front and back reversed in order to form multiple or double-sided images on the paper P. This is a direction changing conveyance device leading to the copying machine 1. 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 1 is constructed as shown in FIG.

In other words, numeral 4 in FIG. 1 is a main body of the copying apparatus, which is provided with a document placement glass 5 as a document placement section on which the document A sent by the copying device 3 is placed, and also has a front edge portion of the top surface. is provided with an operation panel 6, which will be described later with reference to FIG.

Further, a paper feed cassette 7.
8.9 is installed. Also, the upper paper feed cassette 7
The cassette cover 10 serves as a manual paper feed stand 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. Two-color developing device 1 to be described later
5. Transfer device 16° Peeling device 17. Cleaning device 18. and a residual erasing device 19 are arranged in this order.

In addition, a paper feed cassette 7, II
. A paper conveyance path 23 leading to the discharge section 22 provided on the left side of the apparatus main body 4 is formed.

Further, a pair of aligning rollers 24 is disposed on the upstream side of the image transfer section 2 of the paper conveyance path 23, and a fixing device 25 and a pair of paper discharge rollers 26 are disposed on the downstream side.

Further, the operation panel 6 is arranged as shown in FIG. Button 331 Single-sided copy mode display LBDs41 Double-sided copy mode display LED
ss.

Dual copy mode display LED? 6i, density adjustment button 37. An automatic exposure button 38 is arranged. Also, in the center part there is a variable magnification button 43. Zoom button 449 Color specification button 45. A display section 46 is arranged to display three communication elements indicating copying conditions (image forming apparatus), the status of the copying machine, or operating instructions to the operator.

The display section 46 consists of a display tube as shown in FIG.

46a, . . . are arranged in tandem over a length of, for example, 190 iu.

46a, . . . have a circuit configuration as shown in FIG. 1 (el). In FIG. one light emitting segment 42a
f? - select and perform digit selection by 40 grids 602; The plate 601 is coated with fluorescent paint, and when electrons ejected from the cathode 603 collide with the plate 601, light is emitted.

At this time, when a positive voltage is applied to the grid 602, the electrons emitted from the cathode 603 are absorbed by the grid 602, so that the plate 601 does not emit light. Therefore,
Light emission can be controlled by voltage C2 applied to the grid 602. In addition.

Reference numeral 604 denotes a heater, and by applying an alternating current voltage with a superimposed direct current bias to this heater 604, the gradient of brightness across one display tube is suppressed.

FIG. 1 (fl shows a block diagram for controlling the above-mentioned display. The display control A microconvenience store 10 exchanges data with the main body control microcomputer 611, and uses this display data. Based on the display control microcomputer 610, the latch driver 6
12°612, . . . are selected and characters are displayed on the 1 display tube 46. An example of this display is shown in FIG. (operation instructions, etc.), and then press the right three digits (6
15) to display the number of copies.

By displaying the three main display elements in one display tube in this way, the user can know the copying conditions, the status of the copying machine, operating instructions, etc. at a glance. In addition,
Here, the display section is constructed using a fluorescent display tube, but a liquid crystal display may be used instead. Furthermore, the contents of the 0 display are not limited to those described above.

Further, as shown in FIGS. 5 and 6, the exposure optical device 14 has a back portion surrounded by a reflector 50, and includes an exposure lamp 51 serving as an exposure light source. A first optical unit 53 that has a first mirror 52 as a reflecting member that reflects light reflected from the document placement surface 5a in a predetermined direction and is movable along the document placement surface 5a; In synchronization with the optical unit 53 and in the same direction'!
A second mirror 55 moves at half the speed of the optical unit 53 of the iS1 and reflects the optical image reflected by the first optical unit 53 toward the lens unit 54. Third
A second optical unit 57 with a mirror 56 is provided. Further, after the lens unit 54, there is a third optical unit 60 having a fourth mirror 5B and a fifth mirror 59 as reflecting members.

A sixth mirror 61 serves as a fixed reflecting member that reflects the optical image reflected by the third optical unit 60 toward the photoreceptor 12.
It has a configuration with.

Note that 62 is a dustproof glass provided between the sixth mirror 61 and the photoreceptor 12.

63 is a heat ray absorbing glass provided in front of the exposure lamp 51.

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 52 moves.
by moving in the same direction at half its speed v.

The original tAA placed on the document placement surface 5a is scanned and an image is formed on a photoreceptor 12 as an exposed portion which is rotated in advance.

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

The electrostatic latent image thus formed is developed by facing the developing device 15, and then sent to the image transfer section 2 facing the transfer device 16, and the toner image is transferred to the aligning roller. 24, the inner paper P (transferred twice) is peeled off from the photoreceptor 12 by the peeling device 17, and then guided to the fixing device 25 through the conveyance path 23. Then, the image is fixed, and the sheet is discharged to a discharge section via a pair of paper 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 potential on the photoreceptor 12 is lowered below a partial level to enable the primary copying operation.

Further, as will be described later, the lens unit 54 and two mirrors 511 arranged at an angle of 90 degrees are also provided.
A third optical unit 60 having a lens 59 can be moved as shown by arrows A and B in FIG. #! It has become a reality.

In addition, as shown in Figure @3 and Figure 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 a first shielding member 65 that also serves as a lens cover is provided. The unit 57 includes a first shielding member 6
A second shielding member 66 is provided in such a manner that it partially overlaps with the original 1#.
A partitioning means 68 is configured to partition the cooling air passages 67 along the placement 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 consisting of a roller or a sliding member, and no special guide means is required. It looks like this.

Further, the first optical unit 57. Lens unit 5
4. The lower surface side of the third optical unit 60 is covered with a partition plate 70 that holds a part of the dustproof lath 62, and one end of this partition plate 70 is covered with a fan casing of an exhaust fan 71. 72, and almost partitions the main body 4 of the copying apparatus vertically.

Therefore, as shown by the arrow in FIG.
As a result, the cooling air introduced into the cooling air passage 67 from the right side of the copying apparatus main body 4 is passed through the image stand glass 5 by the first shielding member 65 and the second shielding member 66.
After being guided so as to pass reliably along the bottom side of the C to the left side, it is discharged to the outside C;. For this reason, f! The light lamp 51 can be sufficiently cooled, preventing overheating of the exposure lamp 51 and extending its life, and also preventing the adverse effects of heat on other parts as much as possible. Also.

Overheating is prevented over the entire area of the document table 5, so that the operator does not feel uneasy. Also'! Stray light as shown by arrow E is blocked by the shielding member 66 g2, and image defects caused by stray light entering the lens unit 54 can be reliably prevented.

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

That is, an 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 frame 77.77 in parallel with 5a and 76a.
are installed and these guide frames 77.77
The first optical unit 53 is brought into sliding contact with the sliders 78 attached to the lower surfaces of both ends thereof. and a second optical unit 57 are installed. in this way.

The first optical unit 53. is provided movably on the guide frame 77.77. and second optical unit 57
is moved in a predetermined direction at a predetermined speed by an optical unit operating means 79.

The optical unit operating means 79 has the following configuration. That is, a drive shaft 8θ is horizontally mounted corresponding to one end in the moving direction of the optical unit 53.57, and drive pulleys 81.81 are respectively attached to both ends of the drive shaft 8θ, that is, to the outside of the frames 75.76. ing. 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, and
Both ends of the carriage 85 of the optical unit 57 of 's2 have pulley attachment parts ssa and ssb that are vertically bent along the outer surface of the frame 75. , 117 are each attached.

Further, a midway portion of a wire 88 is wrapped around each pulley 81, 82, 116, 87 in a predetermined state. That is, after 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, wound around the first pulley 86 of the second optical unit 57, and then folded back.

It is wound around the drive pulley 81 multiple times and then wrapped around the driven pulley 82 again. Then, the wire 88 is wound around the driven boob 982, and then around the second pulley 87 of the second optical unit 57 and folded back.

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 shaft 80 is interlocked with a pulse motor 93 and a timing belt 94, and has a drive shaft 81 around which a wire 88 is wound. Ill is driven in the forward direction or in the reverse direction. and,
First optical unit 53 fixed directly to wire 88
is the speed ■, and the second optical unit 57, to which pulleys 86 and 87 to which the wire 88 is connected and which functions as a moving pulley, is attached moves at a speed that is half of the speed ■. It becomes.

Further, as shown in FIG. 8, a pair of pulleys 86 and 11 are respectively attached to both ends of the second optical unit 57.
7 are attached to support shafts 95 and 96 that are 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 support state can be maintained for a long period of time without any moment acting in a direction perpendicular to the tension direction of the wire 88 and without generating vibrations.

In addition, 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.

Also, as mentioned above, in order to change the copying magnification, the lens unit 54. and a third optical unit 60 equipped with two mirrors 511 and 59 arranged at a 90 degree angle, respectively, by a predetermined amount f, that is, full.If a lens with a focal length f of 21011i1 is used, approximately the following It is necessary to move it as shown in the table.

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, making the lens unit 54 movable and the third optical unit 60 movable with a smaller amount of movement than this lens unit 54. It is possible to obtain a copy magnification of .

In other words, a pair of screw shafts 100 and 101 are rotatably installed in parallel across the movement path of each unit 54 and 60.

The third optical unit 60 is slidably supported by fitting slide pushers jL103 attached to both ends of the carriage 102 onto these screw shafts 100, 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 101 rotates in the forward and reverse directions, the @3 optical unit 60 reciprocates using the screw shafts 101 and 100 as a guide.

The screw shaft 101 is configured such that the driving force of the mirror driving 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 on the screw shaft 100 via slide bushes 120, 120, and the other end is attached to the slider 121 attached to the lower surface of the carriage 108 of the optical unit 60 of @3. By placing it directly on top, it is in a slidable C: supported state.

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 configured such that the driving force of the lens driving pulse motor 105 is transmitted through a set of gears 124 and 125.

As a result, the third optical unit 60 moves a predetermined distance in a predetermined direction as the mirror drive pulse motor 105 rotates forward and backward, and the lens unit 54 moves in a predetermined direction as the lens drive pulse motor 123 rotates in a predetermined direction. It will move a predetermined distance. At this time, by changing the period of the drive pulses of the mirror drive instep pulse motor 105 and the lens drive pulse motor 123.

gJ3 requires less movement than lens unit 54
The amount of movement of the optical unit 60 per unit time is set to be smaller than the amount of movement of the lens unit 54. and.

L/ y ; Move slowly.

High positional accuracy can be obtained.

The developing device 15 has a configuration as shown in FIGS. 10 to 16 (2). That is, as shown in the iop, a developing roller 130 is used as a first developing member, and a developing roller 130 is used as a second developing member. It has a developing roller 131, and these developing rollers 13o.

131 can be selectively driven to perform black or red development, for example.

Also, current g! The device 4 is divided into two parts: a first developing unit 132 including a first developing roller 130 and a second developing unit 133 including a second developing roller 131. The second image unit 133 on the lower stage uses the image side Da for red viewing with less
The black developer Db, which is frequently used, is used. Note that the developers Da and Db are two-component developers consisting of toner and carrier.

The first developing unit 132 that uses red developer Da #4'' is composed of a developing mechanism section 134, an image side agitating section 135, and a developing roller 130, as shown in FIG. 12 and FIG. 211113. , which is provided at the sliding contact portion of the developer magnetic plan Da' formed on the surface of the developing row 2130 with the photoreceptor 12, that is, on the upstream side of the development position 136, and regulates the thickness of the developer brush Da'. A scraper 137 and a scraper 139 that scrapes off the developer magnetic brush Da' provided on the surface of the developing roller 130 downstream of the developing position 136 and guides it to the developer accommodating section 138 and Housed developer agitator 140
, 140 are housed in a casing 141.

Further, the first developing roller 130 includes a magnetic roll 142 and a sleeve 143 fitted around the magnetic roll 142. Magnetic roll 142 5 magnetic pole parts 144a to 1
44e, the first, third . Fifth magnetic pole part 144a, 1
44G.

144e is the N pole, 2.8% 4 (7') magnetic pole part 144
b.

144d is an S pole, and each magnetic pole part 144ja ~
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 Gauss.

Therefore, in this first developing unit 132, 1
The rotating sleeve 143 is rotated clockwise in the figure to develop a so-called "against" mode, and the photoreceptor 1
The electrostatic latent image formed on the photoreceptor 12 is developed by sliding a developer brush Da' held on the surface of the photoreceptor 12 in a direction opposite to the flow of the image. 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.

Here, since the diameter of the photoreceptor 12 is 78u, one circumference from the exposure position to the transfer position is about 122vuIL. 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 C2.

The inventors have already confirmed that it is possible to install a developing device in which the developing roller 130 has a diameter of 40 μm or less in terms of space through the above-mentioned transportation. Further, the height of the developing unit 133 of the first developing unit 132.1@2 is limited, and when the drum diameter is 781EI, 1201! It has been confirmed that it must be less than or equal to II. 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 opening of the developing unit faces downward, so in the with mode where the developer [a] flows from the top to the bottom, problems such as spilling of the developer Da may occur. occurs. In this respect as well, it is advantageous for the upper first developing unit 132 to operate in the opposite mode.

Further, in the first developing unit 132, the developer magnetic brush Da' on the one-rotation sleeve 143 is removed by a developer removing means 145. As shown in FIG. 12, this developer removing means 145 simply moves the rotating sleeve 143 in a direction C (counterclockwise) opposite to that when viewing images.
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 the developer Da on the one-rotation 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, if the magnetic pole part is five poles here, the first magnetic pole part (conveyance part) 144a and the fifth magnetic pole part (conveyance h) J44
The farther apart e is, the more efficiently the developer Da is transported.
Because 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 scraper pane 39 with its tip in contact with the rotating sleeve 143 to prevent reverse conveyance of the cursed image side Da. It's higher.

Further, the reverse rotation of the one-rotation sleeve 143, that is, the removal of the developer magnetic plastic plate VDa, is performed not only after the development operation is completed (after the copy operation is completed) but also after the apparatus is inadvertently stopped. Ding nawachi.

In the event that the power is turned off or the device suddenly stops due to a paper jam, etc., the power is turned on again and measures such as removing the paper jam are taken and the optical system of the exposure optical device 14 is returned to its initial state. At the same time, the reversal is performed again, and the developer Da is implanted so that there is no developer Da on the rotating sleeve 143 at least in the vicinity of the developing position 136 during the "copy town" state, that is, at the time of resolving. It becomes.

In addition, the diameter of the one-turn sleeve 143 is approximately 4011! II and below 1 width is about 230! ! In the case of a small device of about 1 or less, the method for controlling the conveyance and non-conveyance of the developer Da is other than changing the direction of rotation of the rotary sleeve 143 as described above! I! This can also be carried out by rotationally displacing the magnetic roll 142 via a drive source such as a solenoid so that the first magnetic pole portion 144a faces the doctor blade 137 made of a non-magnetic member.

Further, as shown in FIGS. 13 and 14, 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, and includes a developing roller 131 and a developing roller 147. a doctor 149 that 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 photoreceptor 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 this doctor 149 is transferred to the developer storage section 1.
50 and a developer stirring body 152 housed in the developer storage section 150 are housed in a casing 153.

Further, the developing roller 131 is fitted around a magnetic roll 154 and the magnetic roll 154.

It is composed of a rotating sleeve 155 that rotates counterclockwise in the figure.

In this IS2 developing unit 133,
In order to enable high-speed development, the developing roller 131 is made larger than the first developing roller 130, and the rotating sleeve 15 is made larger than the first developing roller 130.
5 is developed by rotating it counterclockwise in the figure. In this mode, the developer brush Da' held on the surface of the photoconductor 12 is brought into sliding contact in a direction that follows the flow of the image on the photoconductor 12, thereby ensuring sufficient development time.
The electrostatic latent image formed on 2 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 first developing roller 130, so as to be suitable for the with mode. 4th. Sixth magnetic pole part 156b.

zsed, rsef are N poles, 1st. Third. The fifth magnetic pole parts 156a, 156C, and 156e are S poles, and each of the magnetic pole parts 156a to 156f is arranged at an angle of approximately 50' to 60', and the fourth magnetic pole part 156a, 156C, and 156e is arranged at an angle of approximately 50' to 60'.
g d is 800 to 1000 Gauss, other magnetic pole part 156a
, 156b.

156C1156e and 156f have a magnetic force distribution of 400 to 600 Gauss.

Further, in the second developing unit 133, the developer magnetic brush Db/ on the one-rotation sleeve 155 is removed by the developer removing means 152. As shown in FIGS. 13 and 14, this developing side removing means 152 is composed of a blade 158 made of an elastic member such as urethane rubber, and a blade moving machine 159 for horizontally moving this blade 158. 15
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 that is integrated with a blade holder 160 . Then, the motor 163 is turned in the forward direction.
By rotating the slider 16 in the opposite direction, the slider 16 is advanced or retreated, and the blade 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 blade 158 in pressure contact with the photoreceptor 12 exists between the position of the doctor blade 1-9 and the second magnetic pole portion (carrying pole) 156b. This means that the position of the second transport pole 156b is most efficient for scraping off the visual agent plan Db/, but when the interval is increased by 1, the position of the blade 1 is the most efficient.
Ruen gllDb that accumulates between 58 and doctor blade 149
As the amount of developer Db increases, the developer Db that has accumulated during the next copy may be scraped off as the photoreceptor 12 rotates and contaminate the interior of the machine. A reservoir of Db! ] is set at a position where scraping is performed efficiently, that is, between the doctor blade 149 and the magnetic pole portion 156b of fFJ2.

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. For this reason, at least the developer Db at the development position on the one-turn sleeve 155 is removed.

Further, the contact operation of the blade 158, that is, the removal operation of the developer magnetic plan Db is performed by the first developing unit 1 described above.
As in the case of No. 32, this is performed not only after the copying operation is completed (after the copying operation is completed) but also after the attachment is unexpectedly stopped. In other words, if the ILE source is turned off or if the power is suddenly loaded due to a paper jam, etc.
When the power is turned on after a power outage, etc.
1. At the same time that the optical system of the exposure optical device 14 is returned to its initial state by taking measures such as removing a paper jam, the contact operation of the blade 158 is performed again, and the "copy ready" state is reached. The structure is such that the developer Db is not present at least in the vicinity of the developing position 148 on the rotating sleeve 155 at the time of resolving 7-6. The first device configured in this way. The second developing units 132 and 133 are configured to operate selectively in accordance with designation 1 from a color designation section (not shown). In other words, when red is specified, the 15th
As shown in the figure, the magnetic plan Da' is formed only on the rotating sleeve 143 of the first developing unit 132, and when black is specified, the rotating sleeve of the second developing unit 133 is formed as shown in FIG. Only the upper seam of 155 is provided with a magnetic brush Db/.

When the first developing unit 132 side is designated to be operated, the rotary sleeve 143 of the first developing roller 130 rotates clockwise as shown in FIG.
Surface 1 of one-rotation sleeve 143: Developer magnetic brush Da
' is formed.

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

When the development of this electrostatic latent image is completed, R? As described above, the developer removing means 145 operates and the rotating sleeve 143 rotates in the reverse direction, and at least the developer Da at the developing position 136 is removed in preparation for the next developing operation.

Note that, at this time, since the developer magnetic brush Db/ is not formed on the rotary sleeve 155 of the second developing unit 133, problems such as color mixing may occur even if either of the developing units 132, 133 is designated as the primary developing unit. It is designed not to occur.

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 developer magnetic brush Db' is formed on the surface.

In order to cope with high-speed copying, a first developing unit 1 is installed.
Photoreceptor 1 whose rotation was controlled at a higher speed than during development using 32ζ2
The electrostatic latent image previously formed on 2 is developed with black developer Db.

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
There is also a developer magnetic brush 1) a on the rotating sleeve 143 of 2.
/ is not formed so that problems such as color mixing will not occur even if either primary developing unit 132 or 133 is specified.

Please note that the process speed for black copying is high.
Color (red) copying time is set to be low, improving the image quality of color copying.

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 12 is 22.
3 tomo/8,35 sheets/min.

During color copying for A4 landscape paper, that is, during development in the first developing unit 132, the peripheral speed of the drum-shaped photoreceptor 12 is 136+ff/a, 25 sheets/min.

The speed is variable for A4 horizontal paper, and the diameter of the developing roller 130 is 3811 mm compared to 50113 mm for the second developing roller 131.
It is as small as 3% and by ensuring sufficient development time.
You can get high-quality color images. The black copy is even more frequently used.

Enables high-speed copying.

Further, each developing unit 132 configured as described above,
133 has a front cover 17 as shown in Figure 17.
By opening 0, the developer transport shafts 132a and 133a protrude from the exposed state, and these developer receiving and transporting parts 1:9! a, 133al: Cartridge-type developer replenishing devices 171 and 172 are removably attached to the connected state. And developer storage section 138
．． Based on the detection signals from the developer empty detectors 173 and 174 (see FIG. 3) which detect the amount of developer ff1 (toner amount) of 150, the amount of developer Da corresponding to the consumption amount is detected.
The structure is such that Db is replenished as appropriate.

Developer replenishing device 17 on the second developing unit 133 side
2 is configured as shown in FIGS. 18 to 20. That is, 175 is a container that stores the developer Da, and a transfer screw 1 is provided at the bottom of the container 175 to transfer the developer gI and Db in the axial direction by being rotationally driven.
76 is in a stored state.

Further, at the lower part of one end of the transfer screw 176 of the container 115 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 125a is formed that can be freely inserted into and removed from 7. A developer release 0178 for releasing the developer Db transferred by the transfer screw 176 is formed on the lower surface side of the fitting protrusion 125a.

Further, the holder 171 is connected to the developer receiving and conveying section 133.
It is rotatably attached to the top surface of a, and a replenishment port 179 is formed on the bottom surface of the toner a, corresponding to the developer transport shaft (toner auger) 182 of the developer receiving and transporting section 133a. It is in a state of

Further, the holder 1 is attached to one end of the transfer block 9x-176.
It has a connecting portion 176a that protrudes from the end surface of 27 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 175a.
A lid 183 is provided to be slidable to open and close the lid 8. On the other hand, on the holder 177 side, a recess 18 serving as an engaging portion that engages with an engaging protrusion 183a formed on the lid body 183.
20(a) when the fitting protrusion 175a is inserted into and removed from the holder 127.

As shown in FIG. 3B, a lid 183 slides to open and close the developer discharge port 180.

Further, as shown in FIGS. 17 and 18, the drive device 180 includes a 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 base 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 transport screen L-176 is rotated.

As a result, the developer Db in the container 175 is released to zero.
178 side, and is fed into the replenishment port 179 of the developer receiving and conveying section 133a.

Next, the replenishment port 179 of the s-image side receiving and conveying section 133a
The developer Db fed into the developer storage section 150 is carried upwardly within the developer storage section 150 as the developer transfer shaft 82 rotates.

On the other hand, developer discharge ports 201a to 2 are provided at the bottom of the developer guide 200 that surrounds the image separation transfer shaft 182.
01h is provided with a certain interval La to Lg,
The developer is distributed over substantially the entire axial direction of a developer agitator 152 provided in the developer storage section 150 . The intervals La to Lg between the developer discharge ports 2013 to 201h become narrower as they go in the developer transport direction, and C2, the opening area of the developer discharge ports 201a to 201h is larger in the developer transport direction. Currently, the image side Db is uniformly distributed.

In addition, when removing the cartridge-type developer replenishing device 122, 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 screw 126
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.

The fitting protrusion 1 is removed from the holder 177 by pulling it toward you.
75a will be pulled out.

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

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. s18 and 19. . That is, 5210 is developer D
The container 210 houses a transfer screw 211 in the bottom thereof which is rotated to transfer the developer Da in the axial direction.

Further, 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 133a.
A fitting protrusion 210a is formed which can be inserted into and removed from the fitting projection 210a. A transfer sleeve 9 is provided on the lower surface side of this fitting protrusion 210a.
A developer discharge 0213 is formed to discharge the developer Da transferred by 3-211.

Further, the holder 212 is connected to the developer receiving and conveying section 133.
Rotatable C: is attached to the upper surface of a, and a replenishment port 214 is formed on the bottom of the developing agitator 140, which is formed of a spiral shaft, and corresponds to the space between the developing agitators 140, 140. It has become.

Furthermore, one end of the transfer screen L-221 has a connecting portion 211a that protrudes from the end surface of the holder 212 and is connected 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, a recess 218 is formed on the holder 212 side as an engaging portion that engages with an engaging protrusion 217a formed on the lid body 217.
When the developer guide 10a is inserted and removed, the lid 217 slides to open and close the developer guide 213 in the same manner as described above.

Further, as shown in FIGS. 17 and 18, the drive unit B215 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. ing.

Note that 223 shown in FIG. 18 is a support member that supports the side end surface of the container 2)0.

Accordingly, the detection signal 1 from the developer encroachment detector 173 described above: Therefore, the motor 221 is driven for a predetermined period of time.
Transfer screw 211 rotates.

As a result, the nine images 111)a in the container 210 are sent to the developer discharge port 213 side and sent to the replenishment target 0214 of the developer receiving and conveying section 132a.

Next, the replenishment port 214 of the developer receiving and conveying section 132a
The developer pa 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 171 is rotated toward the front about the holder 212.

The fitting protrusion 2 is removed from the holder 212 by pulling it toward you.
10a will be pulled out.

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 stirring body 225, 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 side C2. A plurality of pawls 227 are provided to protrude and engage with the attached sprocket 226. Then, as the transfer valve knee 176 rotates, the stirring blade 225
rotates to prevent the developer Db in the container 175 from clumping or shifting, thereby making it possible to reliably supply the developer Db without leaving any residue.

On the other hand, in the container 210 that houses the developing side Da, similarly,
The stirring blade is housed, and is configured to similarly stir the developer Da in the container 210.

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. Also.

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.

28th [! As shown at 21, paper feed cassettes 7, 8, 9 each containing paper P... are removably mounted on the upper surface of the base 240 via guides (not shown).

As shown in FIG. 25, these paper feed cassettes 7, 8, and 9 each have guides 241 and 242a that regulate the rear end position and both side ends of the paper P.

242b, and a paper support plate 243 that supports the paper output end side.
It has a configuration with.

The paper support plate 243 is supported in a swingable manner by engaging a groove formed on the bottom surface of the cassette body 244 with the opposite paper output end side thereof. Further, the paper support plate 243 is formed with through holes 245, 245, and the paper support plate 245 at the bottom of the cassette body 244 is formed with through holes 245, 245.
An opening 246 is formed at a position corresponding to 3.

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. 24 to 28C, and when one of the guide members 247 is moved, the other guide member 247 is moved It is supposed to move.

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

Both guide members 24 are
2 constitutes an interlocking means for interlocking the two.

As shown in FIG. 28, the bottles 250, 251 are inserted into the corresponding guide slots 252 at intervals, so that
The rack 249 is guided to move along the width direction H. In addition, two guide pins 256 are protruded from the cassette body 10 on both sides of the binion 248, and the rack member 249 is prevented from coming out of engagement with the binion 24B by the back surface of the corresponding rack 248. Holds guidance.

In addition, 257 in FIG. 1 is a guide reinforcing plate attached to the back surface of the cover 10 by appropriate means, and an interlocking means is provided in the width direction along the running path of the knife rack 249. This guide reinforcing plate 257 also has a long hole formed in a state that matches the long hole 252 of the cover 10.

Also, the pivot shaft portion 2 rotatably supports the binion 248.
As shown in Fig. 29, 58 is provided protruding from the back surface of the cover 10, and a braking member 259 consisting of a rectangular plate spring is attached to the upper end of this pivot shaft 258 and fixed with a screw 260. has been done. The left and right pair of cut and raised tongue pieces 259a, 259a of the braking member 259 are bent to form the pinion 25.
8, and both ends 269b, 259b of the braking member 259 are bent at right angles, and cutouts (not shown) formed therein are inserted into the guide pins 256, 256. It is engaged with. Therefore, the pinion 248 is the tongue piece 259a of the braking member 259,
259H applies a slight braking effect to the rotational movement, thereby preventing blind movement such as one rotation too far. 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 letter support plate 24 of each paper feed cassette 7.11.9
3 is a support plate push-up mechanism 2 provided in each cassette mounting section;
The uppermost sheet P is selectively pushed up by the rotating operation of the push-up lever 264 of 63, and is pressed with appropriate force against a take-out roller (paper feed roller) 265 as a take-out means.

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 operating lever 267 are attached with a phase shift of 80 degrees. Further, a spring 268 is connected to the first operating lever 267, and the lower surface of its free end is always urged to abut against 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 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 Section 30).

Accordingly, with this movement, the push-up lever 264, which is in an integral relationship with the first operating lever 262 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 top may be separated from the take-out roller 265, come into contact with it, or be torn.

In addition, as shown in FIG. 24, rollers 2119 and 290 that roll into contact with each other serve as separation means 288 for separating the second and subsequent sheets of paper P picked up in a single layer and preventing the paper from being taken out. is provided. These rollers 2119, 290 are constructed as shown in FIG. In other words, 291 in Figure 1 is a motor, and this motor 291 is connected to gears 293 and 294 via a gear 292.
It is in a state of engagement.

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 290 via a shaft 297 having a spring rat f296 in the middle.
It is configured to work in conjunction with.

Further, the spring clara f296 is the roller 2B9.
, 290 is set to slip when the force at the contact portion exceeds Ta. Further, let Tb be the frictional force between the rollers 2119 and 290.

Ta)Tb, and the roller 289 is configured to rotate according to the roller 290.

Also, let Tf be the frictional force between paper P and paper P.

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 friction coefficient such as rubber. And %Ta is Tr:
>Ta)Tf.

Thus, during paper feeding standby, the paper P is in a state I separated from the take-out roller 265 as shown in FIG. 23 (al).

During paper feeding, as shown in FIG.
After being transferred to 5.

As the take-out roller 265 rotates, the uppermost sheet P is taken out from the roller 211 constituting the one-separation means 288.
It will be sent between 9,290 and 9,290.

At this time, the second and subsequent sheets of paper P that have been adsorbed and taken out by the uppermost paper P are %
The sheets P are separated by the reverse rotation operation of 90, and only the uppermost sheet P is taken out.

This is because when the paper P enters between the rollers 2B9 and 290, the roller 289 moves the paper P in the direction of arrow J due to Tr:>Tf, and the roller 290 and the paper P... return it in the opposite direction due to Tr>Ta>Tf. This is because

Note that when one sheet is started to be taken out, the push-up lever 264 is lowered as shown by the ridge in FIG. 23, and the machine is again on standby in the state shown in FIG. 23 (at).

Further, as shown in FIG. 33, there is a position corresponding to the bottom side of the paper feed cassette 7°8.9 and a paper transport path (two corresponding positions) immediately before the separating means 288.

Reflective optical sensors f300 and 301 are provided as paper detectors, each connected to a control section (not shown). The sum of the "no paper" detection signals of these two sensors 300 and 301 constitutes a paper no detection means 302 that determines that there is no paper.

33 (as shown by al, upper ζ of the paper support plate 243: If the paper P is placed on the paper support plate 243, this can be detected when the paper support plate 243 is lowered; (As shown by bl, the last sheet separated by the roller 290 is held between the rollers 289 and 290 (if there are two, the paper feed cassette) corresponds to the bottom side of 7 (8 @ 4?) Although the sensor 300 installed at the position cannot detect this, it can be detected by the centimeter 301 installed at the position corresponding to the paper conveyance path just before the separating means 288. Therefore, even if there is paper P, This prevents it from being determined as "out of paper" regardless of the situation.

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 one-separation means 288 is transferred to the roller 24 of the stopped registration roller pair 24.
After it is brought into contact with the contact portion between a and 24b and 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 5osb 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. 30 in 1 figure
7 is a pulse motor as a driving means, and a driving gear 30B attached to the driving shaft of this motor 307 is in mesh with a gear 310 via an intermediate gear 309. The gear 310 is one of the rollers 2 of the registration roller pair 24.
A sprocket 312 is integrally attached to the intermediate gear 309, and a sprocket 312 is attached to the intermediate gear 309 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 latte 319, and teeth Ti:xi are attached to the shaft of the transfer roller 305b. The gear 314 further includes an intermediate gear 316
, 317 in order, and is meshed with a gear 318 attached to the shaft of the roller 265.

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 3/5 is turned on, driving the take-out roller 265 and the roller 305b, and driving the roller 24a. is not transmitted and is in a stopped state. Further, when the motor 307 rotates in the reverse direction (in the direction of the dashed arrow), the one-way clutch 31 is turned on, the one-way clutch 315 is turned off, and only the roller 24a is driven.

The rollers 305b and 265 are in a stopped state due to the action of the one-sided clutch 319, with no power being transmitted to them.

In this way, by the forward and reverse rotation of the pulse motor 307 as a driving means, the take-out roller 265° registration roller pair 2
The configuration is such that one of the rollers 2411 of 4 is selectively rotated.

In addition, the uppermost paper feed cassette mounting section is equipped with a manual feed roller that sequentially takes out the sheets of paper P set in one manual feed tray one sheet at a time and sends them to the separation means side through the take-out roller 265 section. 32 holes are provided. The manual feed roller 321 and the take-out roller 265 are connected by a roller contact/separation means 322 shown in FIGS. 24 and 35.

Can be freely moved towards and away from the paper transport path! l! It has become a
At least during manual paper feeding, the output 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 the arms 323, 323, which are rotatable about the spindle 289a of the roller 289 of the separating means 28B. Also, the one manual feed roller 321 is the take-out roller 26.
The arm 324 is rotatable around the support shaft 265a of No. 5 as a fulcrum.
Attachment is supported at the free end of 324 degrees.

In addition, locking protrusions 342a are integrally provided at the free ends of the arms 324, 324 in a state that intersects perpendicularly with each other, and these locking protrusions 3422°342a are attached to the support shaft 325.
The free ends of levers 327, 327 attached to a rotating member 326 which is rotatably supported using the lever as a fulcrum extend upward.

The rotating member 326 is always urged counterclockwise by a spring 328 in the state shown in FIG. 324a, 3
24a is in a lifted state.

In addition, the first rotating member 326 has a plunger type lunoid 32.
No. 9 plungers 329a are connected via a connecting portion side 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 sprocket 332 is attached to the spindle 265a of the take-out roller 265, and a sprocket 333 is attached to the spindle 321a of the manual feed roller 321.

They are interlocked with each other via a chain 334.

When the paper P is placed on the paper feed tray 11, the manual paper feed switch 331 is turned on, and the solenoid 329 is turned on as the start point 9'/30 is turned on. Then, the first rotating member 326 is rotated against the biasing force of the spring 328, and the first manual feed roller 321 is lowered, and in conjunction with this movement, the take-out roller 265, which is a perfect circular roller, is moved upward away from the paper conveyance path. Displace.

Then, when the paper P is sent to the separation means 288, the solenoid 329 is turned off, the manual feed roller 321 is raised, and the output 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 is separated from the take-out roller 265.

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

The fixing bag #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.
and a heat roller 338 whose outer surface is coated with Teflon.

Bracket 3 rotatably supported via support shaft 339
The lower roller unit 3 is configured to be attached to 40.
37, a pressure roller 341 made of a rubber roller is pressed against a bracket 3 that is constantly urged upward by a compression spring 3421.
The configuration is that it is attached to 43. The bracket 343 has a long hole 345°34 through which the guide shafts 344, 344 are inserted.
A movable frame 346 is provided near the free end side of the bracket 340 of the upper roller unit 336, and is movable up and down within the range of the elongated hole 345. 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. As shown in FIG. 36(a), 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 resists the biasing force of the compression spring 342 and rolls into contact with the pressure roller 341 in a depressed state, so that a predetermined contact pressure is obtained.

In addition, if necessary, such as checking paper jam 1, etc., the paper transport path 2
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 about 95 degrees using the support shaft 339 as a rotation fulcrum. Furthermore, with such a configuration.

The heat roller 338 and the pressure roller 341 can be easily replaced.

Next, the paper P discharged from the paper discharge section 22 of the image forming apparatus 1 which has been formed as described above is received as necessary, 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 that feeds the image to the image forming section will be explained with reference to FIGS. 37 to 41.

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

This direction conversion conveyance device 2 is a discharging 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 paper sheets P that have been collected; a sheet extracting means 353 that sequentially takes out the paper sheets P accumulated in the temporary stacking section 352 one by one; A first conveyance section 355 that leads to a paper introduction section 354 as a dual-saving recording medium introduction section of the image forming apparatus 1 without changing its leading edge direction to form a sheet, and a state branched from this first conveyance section 355. In order to form a double-sided image on the sheet P taken out by the take-out means 353, the conveyance direction is changed so that the trailing end becomes the leading edge, and the sheet P is guided again to the sheet introduction section 354 of the image forming apparatus 1. Transport section 356 of fs2
and.

A sorting means 357 that is provided at a branching point between the second conveying section 356 and the first conveying section 355 and selectively distributes the paper P taken out by the collecting means 353; and an operation section of the image forming apparatus 1. The guide means 350. The configuration includes drive means 358 and 359 for switching the distribution means 357 and the like.

The guide means 350 includes a gate 362 rotatably provided on a support shaft 361.

This gate 362 is connected to the paper discharge section 22 of the image forming apparatus 1.
, a straight conveyance path 365 that passes through a paper ejection roller pair 363 to a paper ejection tray 364, and a carry-in path 3 that reaches the temporary stacking section 352.
66, and is driven by a driving means 358 to selectively guide the paper P. In other words, the gate 362 is connected to the spring 367.
It is always biased in a certain direction by

Normally, the carry-in path 366 is in the "closed" state and 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 the gate 362 is operated by a spring 36 to open the carry-in path 366 and close the linear conveyance path 365 as necessary.
The structure is such that it can be rotated against two biasing forces C.

Also, in the carry-in path 366, @1 conveying roller pair 3'
70, second conveyance roller pair 371. A third pair of conveying rollers 372 is arranged to transport the paper P to the temporary nucleation section 352.
Note that the third pair of transport rollers 372 is configured to be able to move the receiving and discharging position of the paper P in the direction in which the paper P is fed, as will be described later.

Regardless of the size of the paper P, its leading edge is I& shaped so that it can correspond to the correspondingly provided ejecting means 353 on the ejecting direction end side C of the temporary nucleus concentrating section 352.

Further, the temporary accumulation section 352 is constituted by the upper surface portion of the guide plate 373, and the actuator 374a of the paper detection 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 such that when the sheets P are piled up at the core J 52 C, the take-out roller 377 is displaced upward so that it does not interfere with the pileup of the sheets P.

In other words, a protrusion 376a is formed on the pivot end side of the arm 316 and comes into contact with a lever 378 that rotates using a solenoid 378 as a drive source.
8, the roller 377 that takes out the protrusion 376a is displaced upward as shown by the solid line in FIG.

[The take-out roller 377 is the third one by offJliJT.]
As shown by the two-dot chain line in FIG. 7, it moves downward under its own weight and comes into rolling contact with the sheets P accumulated in the temporary accumulation section 352.

Furthermore, a pair of conveying rollers 380 consisting of rollers 380a and 380b is provided in the paper ejecting direction of the ejecting means 353 configured as described above.

The sheets P taken out from the temporary stacking section 352 are sent to 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 in via the pair of transport rollers 380 will be described with reference to FIG.

That is, the roller pair 311 as the first conveying means
a first conveyance path 382 for conveying the paper P, and a second conveyance path 384 for conveying the paper P; and.

A $3 conveyance path 386 branches from the terminal end of the first conveyance path 382 and includes a pair of conveyance rollers 385 as a third conveyance means, and a second conveyance path 386 is connected to the third conveyance path 386. A fourth conveyance path 3 branched from the base portion of the conveyance path 384
87.

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 386ζ and a second conveyance means 383 provided at a branching point between the second conveyance path 384 and the fourth conveyance path 387
1g2 guide means 38 that guides the paper P that has been reversely fed through the second conveyance path 383 to the fourth conveyance path 387 side.
9 is provided.

It constitutes the distribution means 357.

In addition, the second conveyance path 384 includes a first conveyance path 38.
It is detected that the trailing edge of the paper P guided from the second transport path 384 to the second transport path 384 has reached a predetermined position, and the transport roller pair 383
paper detection means 39 for controlling the paper P so that it can be conveyed in the reverse direction;
0 is set.

[7] The above-mentioned No. 1. Second guide means 388°389
By switching the , the paper P conveyed through the first conveyance path 382 can be conveyed without changing its leading edge in the conveying direction, or the sheet P can be conveyed by changing the conveying direction so that the trailing edge in the conveying direction becomes the leading edge. Then, the paper can be fed into the paper introduction section 354 of the image forming apparatus 1 again.

In addition, the above-mentioned No. 1. The second guide means 388°389 is
A plunger 39 of a plunger type solenoid 392 that is pivotally supported via a support shaft 391 and serves as a two-wheel drive device.
The solenoid 392 is turned on.

The OFF operation causes rotational displacement as shown by the solid line or the two-dot chain line in FIG.

Next, the operation of one-sided copying will be explained.

(al First, press the mode switch button 3 on the operation panel 6.
3 to specify "duplex mode" and set the number of sheets, exposure magnification, etc. using separate operations, and then press the start button (print button) 30.

(bI 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 stacked in the temporary core collecting section 352.

(dl Solenoid 396 of guide means 350 returns.

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

(fl Removal means 35 provided in the temporary accumulation section 352
No. 3 solenoid 378 is pulled, and the take-out roller 377 is lowered.

(gl Take-out roller 312, conveyance roller pair 380% and conveyance roller pair (switch pack roller pair) 383, which also serve as separation means, rotate.

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

(It) The pair of conveyor rollers 380 stops when the leading edge of the paper P reaches the pair of conveyor rollers 383. (However, the pair of conveyor rollers 380 is equipped with a one-way latch, (jl When the trailing edge of the paper P passes the paper detection means 390, the conveyance roller pair 383 is reversed, the solenoid 392 of the sorting means 357 is pulled, and the conveyance roller pair (Feed roller pair) 385 rotates.

(kl) When the leading edge of the paper P reaches the pair of aligning rollers 24 located in front of the image transfer section 2 of the copying device 1, the pair of transport rollers 383 and 385 stop, and the paper P is aligned.

(2) When the paper P is sent to the image transfer section 21 and the trailing edge 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
5b has a one-way latch.

It is rotated by the paper P pulled by the pair of aligning rollers 24. ) (...with the sorting means 357 in its original position.

The operations from 1 to 1 are repeated until the paper P on which one-sided copies have been made in the temporary stacking section 352 runs out.

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

(al First, press the mode switch button 3 on the operation panel 6.
3 to specify "duplex mode" and set the number of sheets, exposure magnification, etc. using separate operations, and then press the start button (print 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.

(C) The paper P that has been copied on one side is temporarily transferred to the nucleus collection unit 352
are accumulated in

(dl Solenoid 396 of guide means 350 returns.

(el Replace the original, set i! light, etc., and press the start button 30.

(G) The solenoid 378 of the take-out means 353 provided in the temporary accumulation section 352 is pulled, and the take-out roller 377 is lowered.

(gl The solenoid 392 of the sorting means 357 is pulled, and the take-out roller 377 and the pair of conveyance rollers 3 which also serve as separation means
80. 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 roller solenoid 378 returns and the take-out roller 377 rises.

(il) 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 380 is equipped with a one-way latch, and (J) When the leading edge of the sheet P reaches the aligning roller pair 24 located in front of the image transfer section 21 of the copying device 1, the conveyance roller pair 385 stops. death.

After aligning the paper P, the paper P is transferred to the image transfer section 21ζ
Two are sent out.

(kl with the guide means 350 in its returned position.

Repeat the operations of (g) to (jl) until there are no more single-sided copied sheets in the temporary stacking section 352.

Furthermore, in this way, the paper ejection section 22 of the image forming apparatus 1
The paper P ejected from the paper P is received as required, and the paper P is transferred to the image transfer unit 217 as an image forming unit of the image recording device 1 again in the same state or with its front and back reversed. In the direction changing conveyance device 2 configured to form a double-sided image, '7
As shown by the two-dot chain line in Figure s37, the member located on one side (lower side) of the paper P passage section can be freely displaced outward (lower side) to open the paper passage path. In other words, the lower guide plate 400a of the guide plates 400a and 400b forming a part of the carry-in path 366, the lower roller 371a of the transport roller pair 371a and 371b, the guide plate 373 forming the temporary accumulation section 352, and the first ．． The lower guide plate 401° that constitutes the second conveyance path 382, 383, the lower roller 380a of the conveyance roller pair 380a, 380b, and the lower roller 383a of the conveyance roller pair 383a, 31J3b rotate with the negative side of the conveyance direction of the paper P as a fulcrum. It is movably provided and attached to a support frame 402, and this support frame 40
In accordance with the displacement operation of step 2, the rollers can be displaced outward all at once to open the paper passage path.

Furthermore, on the free end side of the support frame 402, there are holding means 403, 403 that can hold the support frame 402 in a predetermined state.
By operating these holding means 403, 403, the paper conveying section can be opened, making it possible to easily deal with paper jams and the like.

Further, as shown in FIGS. 39 to 41, a carrying means that receives the sheets P that are sequentially conveyed and sends them to be accumulated in the temporary nucleation part 352 is movable in the direction in which the sheets P are fed. .

That is, the carrying 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 $2 preferential feed roller.

The drive roller 372a has a slit 40 as a guide section.
The driven roller 372b has a supporting shaft 407 which is movably supported horizontally by holding a bearing (bush) 406 at 5,405.
drive roller 372a to sandwich and convey paper P between
The drive roller 3 is provided so as to be in constant rolling contact with the
It is configured to be movable integrally with 72a. The slit 405° 405 serving as the guide portion is formed by a pair of side frames 408, 40 facing apart and sandwiching the paper conveyance path.
8, respectively.

Also, li? The bearings 406, 406 held by the I slits 405, 405 are attached to the frames 408, 408.
The paper P is fixed at a predetermined position depending on the size of the paper P by positioning means 409, 409 provided on the outside of the paper P.

Each positioning means 409 is provided along the movement path of the bearings 406, 406, as shown in FIGS. The structure includes a lever 411 as a positioning member having a diameter of .410. One end of this lever 411 is rotatably attached to the frame 408 via a shaft 412, and the free end serves as a biasing member that constantly biases the concave portion 410 to fit into the bearing 406. The spring 413 is in a connected state.

Note that f414 shown in FIGS. 39 and 41 is the bearing 4.
06, 406 and moves together with the drive roller 372a.

A leaf spring 415 is attached to the movable frame 414 and urges the driven roller 372b toward the driving roller 372a.

Therefore, when setting the transport roller pair 407 that feeds the paper P to the temporary core collecting section 352 to a position corresponding to the size of the paper P, the zero lever 411 is rotated against the biasing force of the spring 413. State 1: Movable frame 4
14 and place the bearing 406°4 in the predetermined recess 410.
It is sufficient if 06 is fitted. In this way, paper P
The transport roller pair 407 can be moved extremely easily to a position appropriate for the size of the sheet P without using a tool such as a screwdriver, and the sheets P can be neatly accumulated in the temporary nucleation section 352 in a removable state.

Also, as shown in FIG. 42, if necessary.

A large capacity paper feeder 420 storing a large amount of paper P can be installed in place of the paper feed cassette 9 at the lowest stage, and a sorter 421 can be installed in place of the paper discharge tray 364.

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 in J order. Further, the taken out paper P is transferred to a guide plate 420 provided in the transport section 420a.
, 427 to a take-out roller 265 disposed in the cassette loading section, and then to a pair of aligning rollers 24 via a separating means 288.

On the other hand, as described above with reference to R33Nk, a reflection type optical sensor 300 as a paper non-detector is disposed corresponding to the paper feeding section C = a paper non-detection signal that sends a "paper non-existent" detection signal to the stomach packaging body side. It is in a state. Therefore, even though there is paper P in the transport section 420a of this large-capacity paper feeder 420,
A signal generation control means 428 is incorporated in the signal generation control means 428 for controlling the generation of a signal indicating ``no paper.'' This signal generation control means 428 is a reflection type optical It has a shutter member 429 made of a reflector that can be moved out of the optical path of the type sensor 300, and when there is paper P in the large capacity paper feeder #420, the shutter member 429 blocks the paper P. If there is no one, a shutter model that allows light to pass through is used.

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 an opening 432 formed at the bottom of the conveyance section 420a.

The arm 431 is biased by a spring 433 to a state where it is always in contact with the stopper 434, that is, to a position where the shutter member 429 does not close the opening 432.

In addition, a solenoid 34 is provided on the pivot end side of the arm 431.
5 are connected.

By turning on the solenoid 345, the arm 43
1 is displaced against the biasing force of a spring 433, and the shutter member 429 is made to face the opening 432.

Note that although the stacking/unloading device has been described here as being suitable for the temporary core collection section 352 of the direction changing/conveying device 2, it can also be applied to other devices as long as the stacking/unloading device collects and takes out paper sheets of different sizes. You can also do it.

Further, although the conveyance roller serving as the carrying means is fixedly supported in two stages, if there are three or more sizes of paper sheets to be handled, three or more stages may be used.

〔Effect of the invention〕

As explained above, according to the present invention, electrical drive circuits can be arranged in a concentrated manner.

It is possible to obtain an image forming apparatus equipped with a display that can simplify wiring and inform the user of main display elements at a glance.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a display in an image forming apparatus according to an embodiment of the present invention. FIG. 2 is an external perspective view of the image forming unit device. FIG. 3 is a schematic longitudinal sectional front view of FIG. 2 above. FIG. 4 is a schematic longitudinal sectional front view of the image forming apparatus. FIG. 5 is an explanatory diagram of the configuration of the exposure optical device. FIG. 6 is a diagram showing a cooling air conduction path. No. 71!21 is No. 1 of the exposure optical device. FIG. 7 is a perspective view showing the actuating means of the second optical unit. FIG. 8 is an explanatory diagram of the configuration of the main parts. FIG. 9 is a plan view showing the lens unit of the exposure optical device and the operating means of the third optical unit, and FIG. 10 is a schematic longitudinal sectional front view of the two-color developing device. FIG. 11 and FIG. 12 are diagrams showing different operating states of the first developing unit, respectively. FIG. 13 and FIG. 14 are diagrams showing different operating states of the second developing unit, respectively. FIG. 15 and FIG. 16 are diagrams showing the state of the developing device. FIG. 17 is a diagram showing the state when the front cover of the image forming apparatus is opened. No. 18121 is a schematic longitudinal sectional front view of the developer replenishing device. FIG. 19 is a schematic vertical side view of the developer replenishing device. 20(a) and (bl) are explanatory diagrams showing the open/closed state of the developer discharge port when the container of the developer replenishing device is attached/detached. A schematic plan view showing the surrounding structure. Fig. 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 diagram of the paper feeding device section. Fig. 25 is a perspective view showing the paper feed cassette with the cover removed. Fig. 26 is a perspective view of the cassette cover that also serves as a manual paper feed tray. Fig. 27 is a perspective view of the guide member of the manual paper feed tray. Figure 28 is a cross-sectional view taken along the line E in Figure 27. Figure 29 is a cross-sectional view taken along the Ro-Ro line in Figure 27. Figure 301F is a support that pushes up the support plate of the paper feed cassette. A schematic perspective view of the board push-up mechanism. Fig. 31 is a schematic illustration of the separating means. Fig. 32 is an explanatory drawing showing the inner paper separating state of the separating means. Fig. 33 (al, (bl is An explanatory diagram showing the arrangement state of the paper-free detector in the paper feed cassette mounting section. Figure tJ134 is a configuration explanatory diagram showing the drive system of the take-out roller and aligning roller. Figure 35 is a roller approaching/separating means for approaching and separating the manual feed roller. A schematic plan view showing the configuration of the fixing device. Figure 36 is a schematic front view showing the configuration of the fixing device. A front view showing the configuration of the letter sorting section of the conveying device. Fig. 39 is a partially cutaway front view showing the configuration of the inner paper carrying section to the temporary accumulation section of the direction changing conveyance device. Fig. 40 also shows the inner paper. A perspective view of the main parts of the loading section. Figure 41 is a partially cutaway side view. Figure 42 shows a large-capacity paper feeder in place of the lowest paper feed cassette and a paper output tray, and a collation device. A schematic longitudinal sectional front view of the image forming units ψ installed respectively. Fig. 43 is a plan view of the signal generation control means incorporated in the transport section of the collating device. Fig. 44 is a side view of the signal generation control means. Fig. 45 is a diagram showing an operation panel in a conventional image forming apparatus. 1... Copying device (image forming apparatus), 6... Operation panel, 46... Display unit. Figure 2 Figure 7 Figure 8 Tatsumi Soko Figure 11 Figure 12 Figure 13 Figure 14 Figure 17 Figure 19 Figure 20 (a) (b) Figure 22 Figure 231!'1 Figure 27 Figure 28 Figure 30 Figure 31 Figure 32 (a) (b) Figure 33 Figure 34 (Knee + 1 0
Figure 35 Procedural Amendment (1st System Patent Office Commissioner Michibe Uga 1, Indication of the case Japanese Patent Application No. 1983-66791 2, Name of the invention Image forming device 3, Person making the amendment Relationship with the case Patent applicant (307) Toshiba Corporation 4, as per the attachment of the agent (no change in content) Procedural amendment written by Satoshi Uga, Commissioner of the Japan Patent Office dated July 21, 1989 1, Patent Application No. 60-66791 No. 2 , Invention Name Artist Formation Device 3, Person Making Amendment Case.Relation: Patent Applicant (307) Toshiba Corporation 4, Agent 5, Voluntary Amendment 7, Contents of Amendment (1) Page 52, No. 10 of the Specification "Figure 23 (a)" is replaced with "Figure 23 (a)" in line 1 and line 10 of page 53
Figure 32(a)” is corrected. (2) In the 12th line of page 52 of the specification, “Figure 23(b)
'' should be corrected to ``Figure 32 (b)''. (3) On page 52, line 20 of the specification, “Figure 23 (C
)” should be corrected to read “Figure 32 (C).” (4) Page 53, line 8 K of the specification “Figure 23 cd)”
The statement has been corrected to read "Figure 32 (d)." (5) Add attached drawing Figure 32 (C) $ (d). Figure 32 (C)

Claims (2)

[Claims] (1) Optically scan the original image placed on the original table,
In both image forming devices that transfer an image corresponding to a document image onto a transfer material, image forming conditions and the status of the image forming device or operating instructions to the user are displayed as contents transmitted from the image forming device to the user. An image forming apparatus characterized by being provided with a display means. (2) The image forming apparatus according to claim 1, wherein the image forming conditions are a copy magnification and a number of copies.