JPS5991466A - Electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To obtain securely an unfix copy without damaging an unfix toner image by providing a switching means for switching the transfer ion path of transfer paper after passing through a fixing device to a fixing or unfixing transfer paper discharging device, a switch operated by the switching means, and a detecting means for detecting the unfixing transfer paper in the unfixing transfer paper discharging device. CONSTITUTION:When a lever 52 is turnd clockwise to a position for turning on a microswitch 58, the upper surface of a transportation belt 5a attains almost the same horizontal surface as the upper surface of a transportation belt 44 to space discharge rolls 48, 49 and on the other hand, a fixing device 45 does not execute a fixing. When transfer paper 34 separated from a photosensitive drum 30 moves on the belt 44, a microswitch 47 is operarted to move the transportation belt 51a from the time point when the tip of the paper 34 reaches a discharge part 51, and unfix transfer paper 34b is transported to the discharge part 51. Also, a microswitch 57 is operated by the paper 34b to stop the belt 51a at the time point when the rear end of the paper 34b reaches the discharge part 51, and discharge the paper 34b so as a 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 having a transfer paper fixing mode and a shortage mode.

When copying the original image using electrophotographic copying (hereinafter simply referred to as copying), if it were possible to control the amount of transferred toner 1, 44 on the transfer paper onto the output tray of the computation machine without fixing it,
Is it better for the following reasons? Il! This is the case.

In other words, an unfixed copy on which the transferred toner image has not been fixed can easily erase 11H using a polyurethane rubber or the like. Appropriate 5. After fixing with fH device,
The desired copy can be easily obtained by writing the necessary 7J[], and by using the partially erased unfixed copy as the original], similar drawings 11 can be obtained. ．． - t'r JJy, can be performed with high efficiency.

Because of this, tifE, all 2N copies of the unspecified future
(!↑A copying machine has been proposed that can
¥1 and Figure 2 are +:11l4 diagrams illustrating this conventional copying machine CM.

In the same figure, ] &J, photoreceptor drum, 2Ji'
4 is a paper feed guide, 5 is an electrostatic charger, 6 is an ML charger, 7 is a conveyor belt, 8 is a suction fan, 9 is a guide plate, 1 ( ) and 11 are heating constant danger The rollers 12 are J and Jl output trays for fixed transfer paper, and 13 is an output tray for unfixed transfer paper.

When obtaining a fixed copy, use the guide plate 9 as shown in FIG.
Make the upper surface 9a horizontal. Therefore, when the transfer paper 14 on which the toner image has been transferred is conveyed by the conveyor belt 7,
The transfer paper 14 is guided along the upper surface 9a of the guide plate 9.

As a result, the transfer paper 14 is fixed to the heat fixing rollers lO and 1.
1, the toner image is fixed by being suppressed and heated, and the toner image is ejected to the ejection tray 2.

To obtain an unfixed copy, rotate the guide plate 9 by a predetermined angle 101 times counterclockwise as shown in FIG.

Therefore, the transfer paper 14 conveyed by the conveyor belt 7 is
The transfer paper 14 comes into contact with the surface 9b of the guide plate 9 and is guided by this surface 9b, so that the transfer paper 14 is not fixed and is transferred to the discharge tray]3. Ru.

However, in such a copy 11-5C, when obtaining an unelectrodeposited copy, the guide plate 90 surface 9b and the toner image on the transfer paper 14 come into contact, resulting in a streaked image. However, this caused the inconvenience of partially disappearing. Also, when making multiple unfixed copies, for example, before the first unfixed copy is taken out from the output tray 1/2, the second unfixed copy is ejected, and the first unfixed copy is This has caused an inconvenience in that the toner image of the image is damaged by the second copy.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic photocopying machine that eliminates such inconveniences and can actually obtain unfinished copies ff:me without damaging unfinished toner images.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 3 is a schematic diagram showing an embodiment of the copy mcM according to the present invention. In the figure, 21 and 22 are the original 20
23 is a contact glass, 2
4 is backup grade, 25 and 26 are original 20
27 and 28 are rungs that illuminate the original 20; 29 is a convergent light transmission array that focuses the reflected light image from the original 29 on the photosensitive drum 3;
A charger 32 uniformly charges the surface of the photoreceptor drum, and a developer 32 develops the electrostatic IH image formed on the surface of the photoreceptor drum with toner.

33 is a transfer paper tray, 34 is a transfer paper, 35 is a transfer paper 34
When the transfer paper is sent out from the tray 33, the quano rollers 36 and 37 separate the transfer sheets one by one and feed them.

4() is a transfer device that charges the transfer paper 34 and transfers the toner image on the surface of the photosensitive drum; 41 is the transfer paper 34t -=7
14: a separator for separating the photoreceptor drum 3(); 42 is a cleaner for removing residual toner on the surface of the photoreceptor drum 30; and a static eliminator for removing residual charge on the surface of the photoreceptor drum 30.

44 is a conveyor belt that conveys the transfer paper 34 that has been transferred by F11;
45 is a flash rung type fixing device N that heats and fixes the toner image on the transfer paper; 46 is a fixing device N that heats and fixes the toner image on the transfer paper;
4 is a suction fan that is placed in close contact with 4, 47 is a micro switch,
48 and 49 are ejection rollers, 50 is an ejection tray that stores the fixed transfer paper 34, and 51 is an unfixed transfer paper ejection section (hereinafter simply referred to as ejection t) that ejects the unfixed transfer paper 34. fi1~).

The details of this discharge section 51 are shown in FIG. In the same figure,
The rollers 51b and 51e that drive the conveyor bell) 5] and a are supported on the side plate 51d via respective shafts 51b' and 510', and 1111+51
b' is rotatably supported by the body of the copying machine CM (not shown). Therefore, the side willow 51d provided with the conveyor bell) 51a and the rollers 51b, 51e is connected to the shaft 5l.
It can rotate integrally around b'.

The lever 52 is pivotally supported by the casing via a shaft F12SL fixed to one end thereof, and has a connecting portion 5 at the rotating end.
2b is fixedly installed, and the connecting member 52b is further provided with elongated holes 5, t formed in the side plate 51d.

A pin 53 that fits in is fixedly installed.

A bottle 54a that fits into an elongated hole 51e is fixedly attached to the other end of the supporting member 54 that pivotally supports the discharge roller 48 at one end thereof. It is pivotally supported by the housing via a shaft 54h provided therein.

Also, inside the cover 55, there is a paper 34 on the conveyor belt 51a.
A suction lid 56 (see Fig. 3) that brings the side plate 5 into close contact with the
1d is provided with a microswitch 57 for detecting the transfer paper 34, and furthermore, a microswitch 58 for detecting the position of the lever 52 and the position of the unfixed transfer paper discharge section 51 is provided. It is installed in the casing.

FIG. 5 is a block diagram showing a control device for the constant H device 45. As shown in FIG. In the same figure, reference numeral 101 denotes a shift register and output terminal for delaying the activation signal S1 of the microswitch 47;
2,111,112,114 and] 191-i OR circuit, 103.109 and 115 are flip frogs, 104,107°108.110.118 and ]2
0t;j, an AND circuit, 113 and 117 are inverters, and 116 is a differentiating circuit consisting of a diode, 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. To this jA8, the lever 52 is rotated counterclockwise as shown in FIG. 4, and therefore the bottle 53 slides to the left within the long diameter 51s, and the side plate 51d is rotated in one direction. . Along with this,
The bottle 54a slides in the 4% hole 51e in the right direction, the support member 54 rotates in the clockwise direction, and the discharge roller 48 moves to 49. ,ru.

Therefore, as shown in FIG. 3, the discharge section 51 is placed in such a manner that the upper surfaces of the conveyor belt 44 and the discharge roller 49 and the upper surface of the conveyor belt 5Ja are not located on the same plane.

The original 20 placed on the top surface of the copying machine CM is transported in the direction of the arrow by the data feed rollers 21 and 22, guided between the contact glass 23 and the backup plate 24, and is guided by the ejection rollers 25 and 26. Ejects to the right.

During this conveyance, the image of the document 20 is illuminated on the contact glass 23 by the rungs 27 and 28, and the reflected image is transmitted to the charger 31 via the convergent light transmitter array 29.
The electrostatic charge of the image on the surface of the photoreceptor drum 30 is uniformly banded by 19 d and is also applied to the surface of the photoreceptor drum 30 which is rotating in the direction of the arrow. A latent image is formed.

This still image is developed with toner by the developing device 32.

On the other hand, the transfer paper tray 33 is
The transfer paper 34 (li, fed out from the transfer device 40 The toner image on the surface of the drum is transferred by the transfer paper 34 (f11111v transport belt 44) separated by the separator 41.
is conveyed to the fixing device 45 by.

During this feeding, the transfer paper 34 turns on the microswitch 47. Once upon a time, the micro switch 47 was opened when the transfer paper 34 was passing through it.
As shown in FIG. 6(a), ζ1 correction code S1 is added to the shift register 101.

The shift register 101 outputs signals delayed by times t1, r, t2 and t3 from the signal S1 to the respective output terminals Qm, Qn and Qi (same as 1xl(b)).
), (c) and (d)).

This delay time 1. The delay time t2 is the time required for the shift register 1.01 to shift m times, that is, the time required for the transfer paper 34 to move from the position of the microswitch 47 to the transfer paper entrance of the fixing device 45.
The time required for the shift register 1 ( ) 1 to perform n-times shifting operations - that is, the time required for the transfer paper 34 to shift by the microswitch 4
The time required to move from Q 177 to the transfer paper outlet of the constant f device 45, and the delay time t3, is the 11t period that the shift register 101 takes for one shift operation, that is, the transfer paper 34 is Micro switch 47
From the device to the output tray 5 (1 (or control unit 51)
) are set in special feature 1 required for ISSi20.

N, 辷Oh, m (n (i).

Therefore, the output signal of the OR circuit 102 is as shown in FIG.
As shown in FIG. 3, the logic level is rHJ from the time when the leading edge of the transfer paper 34 enters the Uji device 45 until the time when the trailing edge is ejected.

And this OR circuit】0? The state of the flip-flop 0103 is changed by the clock signal PC after the IC whose output signal rises and falls, and its output terminal Q becomes the logic level rl (J (see #(f) in the same figure). At the same time, the output terminal of the free-laugh 0 flop I+)3 goes to logic level rL.
Since it falls to J, the AND circuit 120 is disabled! 1ift operation, thereby maintaining the state of the flip-flop 103.

'Also, while the output terminal Q of Brisogeflo 7'l03 is at logic level rHJ, the counter 105 is enabled νIX
During this period, the counter 105 counts up the clock signal PC, and increments the count value of the counter 106 every time there is a carry (overflow). Then, the count value of this counter 1()6 reaches a predetermined time T! As soon as the value reaches the value shown in FIG. 3(g), the output of the AND circuit 07 becomes the logic level rHJ. Therefore, the output of the AND circuit 110 is synchronized with the clock signal PC and becomes the logic level "H" as shown in FIG. Ru.

The clock signal PC generated immediately after this changes the state of the flip-flop 1()3, and the logic level of its output terminal Q rises to l'-HJ. Therefore, the logic level of the output terminal Q of the flip-flop 1()3 repeats the state of becoming 1 clock cycle rLJ after the time TtrHJ while the output of the OR circuit 102 is the Oborozuki level rHJ. Naruko's Frizzoflo f1
The coefficient of the output terminal Q of 03 is determined by the AND circuit 1. (+4
'(f) is output to the fixing device 45 as a charge IIi control signal SC, and the capacitor for flash rung emission of the >T-' fixing device 45 is charged by this signal. The time required to accumulate the charge of act.

In this way, a flash rung is emitted every time the transfer paper 34 advances a predetermined distance after entering the fixing device ft.
The toner image on the transfer paper is heated and fixed.

This operation ends when the output of the OR circuit 1()2 reaches the logic level "T," that is, when the rear end of the transfer paper 34 is ejected from the fixed beak crocodile 45.

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

Next, when the transfer paper is discharged in an unfixed state, the actual %1lio'! Explain the effect of l.

In this case, as shown in FIG.
It is rotated in the direction jI-g to the point where the microswitch 58 is turned on. At this time, the bottle 53 slides on the long side 51e to the right, and the side plate fil (1) is rotated clockwise.
Wru. Along with this, the pin 54& slides to the left inside the elongated hole 51e, and the support part IEJ' 54 rotates clockwise, separating the ejection roller 48 from the JV+ output roller 49. In the illustrated state, the discharge portion 51 comes into contact with a locking member (not shown), and this state 17J: is maintained.

Therefore, as shown in FIG. 8, the upper surface of the conveyor belt 51a of the discharge section 51 is positioned in substantially the same horizontal plane as the upper surface of the conveyor belt 44, and the discharge roller 48 is 49 years apart.

Since the 1 microswitch 58 is turned on by the lever 52 as described above, in this case, the activation signal s2 of the microswitch 58 goes to logic level "11" as shown in FIG. 9(e). It has become. This signal S2
is applied to the fixing device direct 45 via the OR circuit 114 as the T-adhesive operation prohibition signal SD, and therefore, when the logic level of this signal SD is [HJ, the above-mentioned signals SC and ST are applied to the fixing device 45. Even if the fixing device 45 is fixed, the fixing device 45 does not perform the fixing operation. The signal s2 also acts on the suction fan 56 as 1liQ I'1118, so that the suction fan 56 starts its operation when the lever 52k is turned to the position shown in FIG.

The transfer paper 34 separated from the photoreceptor drum 30 is 4,',
When it moves on the Li feed belt 44, the microswitch 47 is activated in the same way as described above, and the reliable activation signal s1 shown in FIG. 9(a) is output. And the same figure (b)
As shown in , when the output terminal Q1 of the shift register 101 rises to the logic level rHJ after a time t3 delay from the signal S1, the state of the flip-flop 0115 changes and its output signal SM becomes the logic level rHJ. The same figure (f
) At the same time, the output of the differentiating circuit 116 becomes logic level "II" (see (C) in the same figure).

The above number SM is the roller 5J, b, 51 of the discharge section 51.
rW, which connects c and the drive source of this roller, acts as a control signal for the activation of a magnetic clutch (not shown), and therefore, when this signal SM reaches the logic level rHJ, that is, the leading edge of the transfer paper 34 - From the time when it reaches the discharge section 51, the conveyance bell) 51m is activated, whereby the unfixed transfer paper 34b is conveyed to the discharge section 51 by the conveyance bell) 51a.

The microswitch 57 is activated by the transfer paper 34b conveyed by the discharge section 51 (Fig. 19 (FC)
As if Vt:71, the activation signal S3 rises to the logic level (''), and the AND circuit 118 becomes active +tJ: [J:H, :y,Q.

Then, the rear end of the transfer paper 341) is placed on the tll exit portion 51:r
When the logic level of the output end QB of shift register 1()1 falls to rLJ at the moment when
is differentiated by a differentiating circuit 116, and the output of this differentiating circuit 11G is converted into a pulse signal PS by an inverter 117 (see FIG. 9(d)). This Yarusu Gogo PS resets the flip-flop 115 via the AND circuit 118 and the OR circuit 119, whereby the logic level of the signal SM falls to "L" and the lLi1j transport belt 51a stops.

In this way, the mine feed belt 51ft transfers the transfer paper 34b.
The leading edge of the transfer sheet 34h is transferred to the ejecting section 51 from the time when the transfer paper 34b is placed on the ejecting section 51 until the rear end of the transfer paper 34b is placed on the ejecting section 51. Retained.

In addition, 570 microswitches are made! The NIJ signal S3 is seen by the copy control section as a copy prohibition signal, and therefore, when the logic level of the signal S3 is rHJ, that is, when there is unfixed transfer paper in the ejection section 51, a continuous The photocopying operation is prohibited, and a display to that effect is displayed on a display (not shown).

As described above, according to this embodiment, it is possible to separately obtain a transfer paper on which a toner image is fixed and a transfer paper on which a toner image is not fixed. Further, since the unfixed transfer paper is discharged without the toner image formed thereon touching anywhere and in a substantially horizontal state, the toner order is not damaged.

Historically, the next copy is not made until the unfixed copy ejected to the ejecting section 51 is removed, so another transfer paper is placed on top of the unfixed transfer paper so that the toner particles are on top. This can prevent inconveniences. This is effective when the present invention is implemented in a copying machine having a repeat function in step 11.

In FIG. 5, signals R8 and JM are a reset signal and a paper jam occurrence signal, respectively, which are output from a copy control section (not shown). When this signal R8 is applied, the shift register 101, flip-flop 103, counters 1()5 and 106, flip-flop 1f)9 and flip-flop 115 are reset. Ru. ′! j, this signal R8 is the OR circuit 111
The trigger signal 81' is outputted to the flash lamp via the trigger signal 81', thereby resetting the capacitor that drives the flash lamp.

The signal JM is output to the flash rung via the OR circuit 111 as a trigger signal ST. At the same time, the fixing operation prohibition signal 81) is outputted to the fixing device via the OR circuit 114, so that the capacitor is reset and the constant 7+! 9. The fixing operation of the device h' is prohibited.

In the embodiments described above, a flash rung type fixing device is used as the fixing device, but the fixing device is not limited to this type. For example, it can be carried out in the same way even when using a heated roller-type fixed shore fitting. However, in that case, the appropriate transfer paper conveying means must be hit before and after the heat fixing roller (or either one of them), and the 7IO heat roller can be separated by the activation signal S2 of the microswitch 58 (or in conjunction with the discharge section 51). At the same time, it is necessary to insert a thermal tracer between the separated roller and the transport path of the transfer paper.

Note that the lever 52 that operates the discharge section 51 can be moved manually or by a motor that is operated by a switch that selects the non-fixing mode.

As explained above, according to the present invention, unfixed co-♂-
This has the effect that similar drawings can be easily created.

In particular, it is possible to prevent a situation in which the fixed copies are piled up at the discharge section and damage the toner image, which is advantageous when a plurality of unfixed layer copies are made in succession.

[Brief explanation of the drawing]

IJA1 and FIG. 2 are schematic diagrams showing a conventional copying machine, FIG. 3 is a schematic diagram showing the operation mode of an embodiment of the present invention when obtaining fixed transfer paper, and FIG. Fig. 1n3, Fig. 5 & J1, a block diagram showing the control device in an embodiment of the present invention, Fig. 6, showing the operation mode of the unfixed transfer paper discharge section when obtaining fixed transfer paper. (, ) ~ 0) is a waveform diagram showing the operating state of the apparatus shown in Fig. 5 when obtaining a fixed transfer paper, and Fig. 7 is an unfixed transfer paper ff: an unfixed transfer when obtaining a fixed transfer paper. FIG. 8 is a schematic diagram showing the operating mode of the paper discharge section, and FIG. 9(a) to FIG. 9 are schematic diagrams showing the operating mode of an embodiment of the present invention when obtaining unfixed transfer paper.
(g) iJl is a waveform diagram showing the operating state of the device 6 shown in FIG. 5 at the point where the unfixed transfer paper is obtained. 50...Ejection tray, 51...Ejection section, 52...Lever, 57.58...Micro switch. Figure 3 Figure 8 Figure 4 Figure 7 5θ

Claims (1)

[Claims] From time to time: i? J (a mode in which the toner image formed on the top is fixed and discharged, and a mode in which it is discharged without being fixed) k 1I
In a photocopying machine, the transfer paper ejecting device that takes out the fused transfer paper and the unfixed transfer paper ejecting device that takes out the unfixed transfer paper ↓11 are set higher than the fixing device. The transfer M (IIIlψ is provided on the downstream side of the transport path, and the transport path of the transfer paper after passing through the fixing device 4 is replaced by either the transfer paper ejection device d or the unfixed transfer paper ejection device (i7I). a switching means, a switching means for operating the switching means at the desired timing, and a composition means for detecting that there is unfixed transfer paper in the unfixed transfer paper J1/output device. At the end of the day, the fixing operation of the fixing device -' is prohibited according to the operation status of the sir switch j11-, and when the fixing unit 11jQ operation is prohibited and the forcible means detects unfixed transfer paper, copying is performed. A photo of Tsutako is shown as a sign of prohibiting the starting motion.