JPS5991469A - Electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To obtain securely an unfixing copy not damaging an unfixing toner image by providing a means for transporting unfixing transfer paper by making it contact with a surface forming no toner image on an unfixing transfer paper discharging device. CONSTITUTION:A microswitch 58 is operated on by a lever 52 to make a fixing device 45 execute no fixing and when transfer paper 34 separated from a photosensitive drum 30 moves on a transportation belt 44, a microswitch 47 is operated to drive the belt 51a from the time point when the tip of the paper 34 reaches a discharge part 51. On the other hand, the lever 52 is turned clockwise to a position for turning on the microswitch 58 to turn a supporting member 54 counterclockwise, to space discharge rolls 48, 49 and the upper surface of the belt 51a is positioned on almost the same horizontal surface as the upper surface of the belt 44, to discharge unfixing transfer paper 34b to the discharge part 51 by the belt 51a. In this case, a microswitch 57 is operated to stop the belt 51a at the time point when the rear end of the paper 34b reaches the discharge part 51, and to discharge the paper 34b so as a formed toner image does not contact with any part but is placed horizontally.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic copying machine that has four transfer paper fixing modes and four non-fixing modes.

? @, When copying a document with a secondary photocopying machine (hereinafter simply referred to as a copying machine), is it possible to eject one image of transferred toner on the transfer paper to the output tray of the copying machine without setting it? 'C is very convenient for the reason.

In other words, an unfixed copy in which the transferred toner image has not been fixed can be easily erased using a spray rubber or the like. After fixation, the desired copy can be easily obtained by making the necessary additions, and by using the partially erased unfixed copy as a manuscript, it is possible to create similar drawings, etc. Can be done efficiently.

For this reason, copying machines that can produce unfixed copies have been proposed. Figures 1 and 2 are
FIG. 1 is a schematic diagram illustrating this conventional copying machine CM.

In the figure, 1 is a photosensitive drum, 2 and 3 are paper feed rollers, 4 is a paper feed guide, and 5 is 'ii)? ? 4 a charger, 6 a static elimination charger, 7 a conveyor belt, 8 a suction fan, 9 a guide plate, 1O and 11 a heat fixing roller,
Reference numeral 12 indicates an ejection tray for fixed transfer paper, and 13 indicates an ejection tray for unfixed transfer paper.

If you want to obtain a safe copy, as shown in Figure 1? r. Level the soil surface 9a of the inner plate 9. Therefore, when the transfer paper 14 on which the toner image has been transferred is conveyed by the carry-in belt 7, the transfer paper 14d is guided along the upward direction 9a of the guide plate 9. As a result, the transfer paper 14 is heated to the fixed Zh roller 10.
and 11, is suppressed and heated to fix the dove formation, and is discharged onto a shipping tray 12.

To obtain a copy of an undefined base, the guide plate 9 is rotated by a predetermined angle counterclockwise one time.

Therefore, the transfer paper 14 conveyed by the conveyor belt 7 is
Surface 9bK of guide plate 9 comes into contact with surface QblC1
As a result, the transfer paper 14 is ejected to the output tray 13 without being input into the transfer tray 13.

However, in such a copy-like CM, when obtaining an undetermined copy, the surface 9b of the guide plate 9 and the transfer x'++, 14
The toner image came into contact with the toner image, causing the inconvenience that the image was streaked or partially erased due to smearing/scanning.

The object of the present invention is to eliminate such inconveniences and to provide an electrophotographic copying system that can reliably obtain a copy of an undefined toner image without damaging the undefined toner image.

Hereinafter, with reference to the attached drawings, the solid line of non-invention.

An example will be explained in detail.

FIG. 3 shows an embodiment of an electrophotographic copying machine (hereinafter simply referred to as a copying machine) CM according to the present invention - no model IV<1. In the figure, 21 and 22 are transport rollers that transport the original 20, 23 is a contact glass, 24 is a backup grate, 25 and 26 are ejection rollers that eject the original 20, and 27 and 28 are rungs that illuminate the original 20. , 29t, j A focusing light transmitting member for forming a reflected light image from the original 20 on the photoreceptor drum 30; 31 is a band m for uniformly charging the surface of the photoreceptor drum; 32 is a photoreceptor drum; This is a developing device that uses toner to develop the static latent texture formed on the surface.

33 is a transfer paper tray, 34 is a transfer paper, 35 is l1lr (
A pickup roller 36 and 37 separates and conveys the transfer paper 34 one by one, and registration rollers 38 and 39 are used to feed the photo paper 34 from the tray 33.

40 is a transfer device that charges the transfer paper 34 and transfers one image of toner on the surface of the photoreceptor drum; 41 is a separator that removes electricity from the transfer paper 34 and separates it from the photoreceptor drum 30; 42 is a photoreceptor 9; Cleaner to remove residual toner from the surface of the ram 300
and a static eliminator that removes residual charges on the surface of the photoreceptor drum 30.

44 is a conveyor belt that conveys the separated transfer paper 34;
a and 44b are rollers that are connected to a drive source (for example, a motor) not shown to drive the conveyor belt 44; 45 is a seven-layer sealing type fixing device that heats and fixes the toner image on the transfer sheet; and 46 is a roller that conveys the transfer sheet 34. A suction fan is brought into close contact with the belt 44, 47 is a microswitch, 48 and 49 are drive sources such as motors (not shown), one of which is a driven discharge roller, 50 is a discharge tray for accumulating the fixed transfer paper, and 51 is an unfixed transfer paper discharge section (hereinafter simply referred to as discharge section) that discharges unfixed transfer paper.

#PPI3 of this discharge section 51 is shown in FIG. In the figure, U-ra 51b and 5 which drive the quick bell) 51a are shown.
1c has shafts 51b' and 51c on the side plate 51d, respectively.
The shaft 51b' is rotatably supported by the casing of the copying machine CM (not shown). Therefore, the cell feeding belt 5]a and the rollers 51b, 51
The H1u plate 51d provided with the H1u plate 51d can rotate integrally around the shaft 51b'.

Leno E-52 is fixed on one end of it! State 152A
A 'II connecting member 52b is provided around the rotating +>r'M part, and a side plate 51d [formed elongated hole 51eK is fitted into the connecting member 52b]. A matching bin 53 is fixedly installed.

A support ff1l member 540 that pivotally supports the discharge a-ra 48 at one end thereof has a bottle 54 fitted to the elongated hole 51et/C at the other end thereof.
A is fixedly provided, and this supporting portion ladle 54 is pivotally supported by the casing via a shaft 54b fixedly provided approximately at the center thereof.

It's gravel, there's a conveyor bell inside Guava 55) transfer paper 3 on 51a.
A suction fan 56 (see FIG. 3) that brings the transfer paper 34 into close contact with the transfer paper 34 is installed on the side plate 51d, and a microswitch 57 that detects the transfer paper 34 is installed on the side plate 51d.
Further, a microswitch 58 is provided in the housing, which is actuated by the lever 52 and detects the position of the unfixed transfer paper discharge section 51.

FIG. 5 is a block diagram showing a control device for the fixing device 45. As shown in FIG. In the figure, 101 is a shift register for delaying the activation signal SR of the microswitch 47;
, 111.112, 114 and 119 are OR circuits, 1
03, 109 and ]15 flip flock 0.1
04,107°1, 08, 110, 118 and 1
20 is an AND circuit h;] 1.113 and 117 are inverters, and 116ij7'l, t--)' is a differentiating circuit consisting of a capacitor and a resistor.

With the above configuration, first, the operation when fixing a toner image on the transfer paper 34 will be explained. In this place, t, 8
As shown in Figure J'44, the lever 52 is rotated counterclockwise, so that the pin 53 slides leftward within the elongated hole 51e and rotates the side plate 51d counterclockwise. In response to this, the pin 54a slides to the right in the elongated hole 51e, the support portion 54 is rotated in the δ1 direction, and the discharge roller 48 is brought into contact with 49 If.

Therefore, the discharge section 51 is placed in such a manner that the upward direction of the conveyor belt 44 and the discharge roller 49 and the upper surface of the conveyor pel 51a are not on the same plane as shown in FIG.

The original plate 20 placed on the top surface of the copying machine CM is transported in the direction of the arrow by the general feeders 21 and 22 to the contact glass 23 and the contact glass 23 and the contact glass 24. and is discharged rightward by discharge rollers 25 and 26.

During this conveyance, the image of the document 20 is illuminated by the rungs 27 and 28 on the contact glass 23, and the reflected image is uniformly υ' jj7% and is formed on the photosensitive drum 30, which is rotating in the direction of the arrow, so that an electrostatic latent image of the image on the original 20 is formed in the concavity of the photosensitive drum 30.

This foil 1'' x 7 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1 x 1.5 cm foil is subjected to a toner effect by the !Jl!r imager 32 .

On the other hand, the transfer paper tray 33 is moved by the pick-up roller 35.
The transferred paper 34 is conveyed in synchronization with the photoconductor drum 30 by registration rollers 38 and 39 so that its leading edge coincides with and contacts the leading edge of the image on the photoconductor drum 30, and the transfer paper is transferred. The toner image on the surface of the photoreceptor drum is transferred by the device 40 . Then, the transfer paper 34 separated by the separator 41 is transferred to a fixed viewing island 45 by a conveyor belt 44.
transported to.

During this conveyance, the transfer paper 34 turns on the microswitch 47. Therefore, the microswitch 47 is opened when the transfer paper 34 is passing over it, and a signal S1 as shown in FIG.
Add to.

The shift register 101 outputs the signal S1 delayed by τ2 and delayed by τ3 to the respective output terminals Q.
m, Qn and Ql are output ((b) in the same figure,
(c) and (d)).

This delay time τ1 is the time required for the shifter 11/soster 101 to shift In times, that is, the time required for the transfer paper 34 to shift.
is the micro switch 4'7 (37, ijj) y
The delay time τ2 is the time required for the loading paper 45 to move to the transfer paper entrance "IHI" required for the shift register 1full to shift n times, that is, the transfer paper 34 does not move to the microswitch 470 entrance. The delay time τ3 is the 11.1 time it takes for the shifter 11/soster 101 to perform one shift operation. That is, the time required for the transfer paper 34 to move from the microswitch 47 position IW to the output tray 50 (reed or 4iF output F't1$51) is set respectively. In addition, m
(n(i).

Therefore, the output signal of OR time #6102 is
), the tip 5W of the transfer paper 34 is the constant collapse device L1.
The logic level is "H" from the time when the rear end enters the JIP output point 45 to the four points where the rear end is JIP-outed.

Then, the output of this OR circuit 102 is Δ1. The state of the 7-rig block 103 is changed by the clock signal PC, which is output from the output terminal Q, and the output terminal Q becomes the power level "■I" (see (f) in the same figure). At the same time, the output end stone of the tilted flip frog 103 is logical level j-1,
Since the voltage falls to J, the AND circuit 120 is disabled,
As a result, the state of the 7-rig frog 103 is maintained.

In addition, the output terminal Q of the free lag flop 103 is
The counter 105 of “Bell r I” is enabled.
Therefore, the counter 105 counts up the clock signal PC by 0, and increments the old enemy 1+0 of the counter I()6 every time there is an overflow. Then, when the g1 number 11 (t of this counter 106 reaches a value equal to 7yI constant time TI), the output of the AND circuit 107 becomes positive as shown in FIG.
The level r n becomes J. Therefore, and times wT1
The output of 7 becomes the logic level rHJ in synchronization with the clock signal pc as shown in (i) of the figure.
Lip 70 and counters 105 and 106 are reset.

Immediately after this, the clock signal pc generates the state of the soli-lag frog 103, and the logic level of its output terminal Q rises to rHJ.

Therefore, the logic level of the output terminal Q of the free-lag flop 103 is in a state that becomes rLJ for one clock cycle after reaching IrHJ for time 1' while the output of the OR circuit 102 is at the logic level "H". It will be repeated.

The E number of the output ψ1^IQ of this flip 70ff103 is passed through the AND circuit 104 to fill %, control fillIi
It is output to the fixing device attack 45 as No. 4 SC, and the container for flash lamp emission of the first constant shield device 45 is outputted as SC No. 4.
the sensor is charged. Therefore, the above time T + k,
Accumulate a constant charge of n[V in the capacitor with f and jin? L
The time to watch is set. In addition, the AND circuit 110
The output of is applied to the constant speed device i 45 via the OR circuit 111, and acts as a trigger signal ST for the flash run.

In this way, the transfer paper 34 is fixed)-1 device (, I,
45 and every time the transfer paper passes a predetermined distance, the seven rattan lamps emit light, and the toner image on the transfer paper is heated and fixed.

Note that this action ends when the output of the OR circuit 102 reaches the logic level rLJ, that is, after the transfer paper 34; and when the HA is discharged from the fixing device 45.

Then, this fixed transfer paper 34B is transferred to the discharge roller 4
8 and 49, the paper is discharged onto the discharge tray 50.

Next, the operation of this actual/iai example when the transfer paper is discharged in an unfixed state will be explained.

In this case, as shown in FIG.
It is rotated in one direction to 1i1 to the extent that the microswitch 58 is turned on. At this time, the bottle 53 slides to the right through the elongated hole 51e, and rotates the side plate 51d clockwise. Along with this, the first pin 54a slides to the left inside the elongated hole 51e, and the support member 54 rotates counterclockwise so that the discharge row 248
is the discharge roller 49 and Ff! will be interrupted. Note that in the illustrated state, the discharge portion 51 contacts a locking member (not shown), and this state is maintained.

Therefore, as shown in FIG.
The upper surface of the photographing unit 51) 51a is set at approximately the same level as the upper surface of the IA transport belt 44 in the horizontal direction (M ljt), and the ejection roller 48 is spaced apart from the ejection roller 49.

As mentioned above, since the microswitch 58 is actuated on by the lever 52, in this case the actuation signal s2 of the microswitch 58 reaches the logic level r f (J) as shown in FIG. There is one.This signal S,
is OR circuit 114 begging, fixing operation prohibited (No. 8 8D
is added to the fixing device f', c 45, so that when the logic level of this signal SD is rHJ, the fixing device 4
Even if the above-mentioned signals SC and ST are applied to 5, the fixing device f:+', 45 does not perform the fixing operation.

Also, the signal S 2 &j' acts as a suction fan 560 control signal, so that the suction fan 56 is activated by the lever 5
2 to the position shown in Fig. 7, the rotational angle υ
Start.

When the transfer paper 34 separated from the photosensitive drum 30 moves on the conveyor belt 44, the microswitch 47 is activated in the same manner as described above, and an activation signal S1 as shown in FIG. 9(a) is output. . Then, as shown in FIG. 3(b), the shift register 101 is delayed by a time τ3 from this signal S1.
When the output terminal Q1 rises to the logic level rHJ, the state of the flip 70 knob 115 changes and its output signal SM
becomes the logic level rHJ (see (f) in the same figure), and at the same time, the output of the differentiating circuit 116 becomes the logic level rHJ (see (c) in the same figure).

The above (No. B SΔ1 is the discharge part 510 rollers 51b and 51
It acts as an operation control signal for a magnetic latch (not shown) that connects the drive source of this roller to 51, the transport bell (b) 51a is activated, and as a result, the unfixed transfer paper 3 (b) is activated.
4b is conveyed to the discharge section 51 by the conveyor belt 51a.

The microswitch 57 is actuated by the transfer paper 34b conveyed by the discharge section 51, and as shown in FIG. 9(g), the actuation No. 18 S3 rises to the logic level rHJ, and the AND circuit 118 becomes operable. It becomes a state.

Then, when the rear end of the transfer paper 34b reaches the discharge section 5, the logic level of the shift register 1010 output foot 4Qi falls to "L", and this falling shift causes the differential circuit 1
16, and the output of this differentiating circuit 116 is converted into an i+rus signal PS by an inverter 117 (9th pulse signal PS).
(See figure (d)). This pulse signal ps is supplied to the AND circuit 11
8 and OR circuit 119 to 7 rip 70 tug 11
5 is reset, thereby causing the logic level of the signal SM to fall to rLJ and the conveyor belt 5ia to stop.

In this way, the conveyor belt 51a transfers the transfer paper 34b
From the time when the leading edge of the paper 34b reaches the discharge section 51, the paper 34b is transferred to 11.
The transfer paper 34b is hooked until the rear end gets on the discharge section 51, and thereby the transfer paper 34b is suction-held while being conveyed to the discharge section 51.

In FIG. 5, signals R8 and JM are a reset signal and a paper jam occurrence signal No. 1, respectively, which are output from a copy control section (not shown). This 16
When signal R8 is added, shift register 101, flip-frog 103, counters 105 and 106, flip-flop 70 knob 109 and flip-frog 0115 are reset.

, this newsletter R8 is triggered via the OR circuit 111.
It is output to the flash lamp as ST, which resets the capacitor that connects the flash lamp to the current.

In No. 1a JM, the signal ST is outputted to the flash lamp via the OR circuit 111, and the fixing operation inhibit signal SD is outputted to the fixing device via the OR circuit 114, so that the capacitor is reset. At the same time, the fixing 11 (b operation) of the fixing device is prohibited.

As explained above, in this embodiment, the transfer paper to which one head of toner has been fixed and the transfer paper to which one toner has not been fixed are separately
I can do something. The unfixed transfer paper is ejected without the toner image formed on it touching anywhere and in a substantially horizontal state, so the toner image is not damaged.

In addition, the above-mentioned signal S3 is sent to both parts of the frame copying system. ' - Shift I to add as an inhibit signal: [, 'l'? Output 5 Output 511 The output unfixed copy is not removed. Since the 1st scale 9th copying operation is not performed, another transfer paper overlaps the soil of the undetermined JT transfer paper - C) The toner image is damaged. This can prevent such inconveniences. This is a repeat on ll\)
This will be effective if you use a copying machine that has a lit function.

In the embodiment described above, the fixing device') - Toshimata Fludge -
Although a rung-shaped fixing device is used, the present invention is not limited to this. For example, the same procedure can be carried out using a heating roller type 5F:, %';I device. However, in the case of 1, -, an appropriate transfer paper conveying means is installed before and after the heating fixing roller (or either one of Q; , in conjunction with the j-output unit 51, the heat fixing process is carried out for a distance of 1ζ11, and this separated roller and the jIiQ of the paper are transferred.
It is necessary to introduce a heat shielding phase at the end of the store.

In addition, make the discharge part 51! 1! The movement of the shaking lever 52 can be done manually or by a motor operated in a swivel mode that selects four non-fixing modes.

FIG. 10 shows another embodiment of the electrophotographic copying machine according to the present invention. This embodiment has a discharge tray 50 and a discharge section 5, except for the rollers 48 and 49 of the above-mentioned actual #i example.
1 toward the fixing device 45 by the width of the rollers 48 and 49. Even in such an embodiment, the same effects as those of the above-described embodiment can be achieved. Note that the other parts are the same as those in the previous embodiment, so the explanation thereof will be omitted.

As explained above, according to the theory 1, the toner image on the transfer paper is prevented from coming into contact with the transfer paper ejecting means, so it is possible to reliably prevent unfixed copies from being damaged. Therefore, it has the effect of facilitating the creation of similar drawings.

[Brief explanation of drawings]

1 and 2 show a conventional copying machine.
Approximately 1 branch], ε (Figure L3 is a schematic diagram showing the operation mode of one embodiment of the present invention when obtaining a fixed transfer paper, and Fig. 4 shows an unfixed transfer paper when obtaining a fixed transfer paper. A schematic diagram showing the operating mode of the discharge section, Fig. 5 t''1, a block diagram showing a control device in an embodiment of the present invention, Fig. 6 (, ) to 0
) is a waveform diagram showing the operating state of the device shown in Fig. 5 when transferring the fixed transfer paper, and Fig. 7 shows the unfixed transfer paper discharge when obtaining the unfixed transfer paper. Fig. 8 is a schematic diagram showing the operating mode of the part, and Fig. 9 is a schematic diagram showing the operating mode of the present invention when obtaining unfixed transfer paper.
a) to (g) ld2, a waveform diagram showing the operating state of the device shown in FIG. 5 when obtaining unfixed transfer paper; FIG. 10 is a schematic diagram showing another embodiment of the present invention. . 50... Ejection tray, 51... Ejection section for unfixed transfer paper, 51a... Conveyance belt, 51b, 51c... Roller, 52... Lever, 58... Switch.

Claims (1)

[Claims] In an electrophotographic copying machine that has a mode in which the transferred toner image formed on the transfer paper is fixed and then ejected, and a mode in which the transferred toner image formed on the transfer paper is ejected as is, an unfixed layer is ejected.
Transfer paper discharge 111 for discharging the fixed transfer paper. a device;
An unfixed transfer paper discharging device for discharging the unfixed transfer paper is provided, and the unfixed layer transfer paper discharging device is provided with a conveying means for conveying the unfixed transfer paper in contact with a surface on which a toner image is not formed. An electrophotographic copying machine featuring: