KR100263053B1 - Exit mechanism of duplexer apparatus - Google Patents

Abstract

PURPOSE: A discharge mechanism of an apparatus for printing on both sides of the paper is provided to miniaturize a system generally, stack paper with a face down method and improve the efficiency of a memory by printing an image print on a photosensitive drum of a printer according as order received from a PC. CONSTITUTION: The discharge mechanism includes a pair of discharging rollers(510), a material(501) of a disc type, a frictional plate(502), a compressed coil spring(503) and a solenoid. The discharging rollers are each other gone in gear so that paper is discharged by a driving portion. The material of a disc type includes the pair of discharging rollers, positions between the driving portion and the pair of discharging rollers, is installed so as to rotate in the same axis direction as the axis of the driving portion, thereby rotating the pair of discharging rollers in the center of the driving portion and stacking with a face down method selectively according to a mode transformation. The frictional plate is attached to the surface of one side of the gear of the discharging rollers to convey the power of the driving portion to the material of the disc type. The compressed coil spring positions between the frictional plate and the material of the disc type, is installed with the same axis as the pair of discharging rollers and sticks the frictional plate in the one direction. The solenoid is worked together the surface of the outer circumference so that whether a current is applied or not is decided by the sensing of a sensor and power convey between the material of the disc type and the driving portion is selectively cut off.

Description

Exit mechanism of duplex printing machine {EXIT MECHANISM OF DUPLEXER APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplex printing apparatus using an electrophotographic developing method, and more particularly, to a discharge mechanism for face down stacking of paper.

Generally, a device using an electrophotographic development method refers to a device such as a copy machine, a digital copy machine, a printer, a facsimile machine and a multifunction machine. Among such apparatuses, a copy machine or a printer may have a function of selectively copying only one end face, or a function of selectively copying both sides. At this time, a device capable of copying both sides of the paper is called a duplex printing apparatus, and the duplex printing apparatus selects one side or both sides at the user's will.

A schematic configuration of such a duplex printing apparatus is shown in FIG. As shown in FIG. 1,

The conventional duplex printing apparatus is selectively provided with a normal mode and a duplex printing mode. In the normal mode, a plurality of sheets of paper are loaded into the paper feed cassettes 110 and 112, in which the paper feed cassette may be installed at the bottom of the apparatus or may be installed at an angle to the rear. Or both. Subsequently, the paper P at the top of each of the paper feeding cassettes 110 and 112 is conveyed toward the alignment roller 124 by the pickup rollers 120 and 122 and fingers not shown in the drawing. Toner is copied onto the upper surface (surface indicated by 2) of the sheet while passing through the developing unit 130 and the fixing unit 140 while the sheet of the sheet is arranged by the alignment roller 124. The paper on which only one surface is copied is guided by the lever 143, and then passed through the paper path 144 by the feed roller 142, and then by the feed roller 146 and the discharge roller 148. Discharged to the discharge stage 150.

This sheet is loaded with the copied side facing the bottom of the discharge bin 150. These badges are face down loaded. At this time, the paper path is guided by the paper path lever 143, and this lever 143 is operated by a sensor not shown in the figure. In the drawing, the upper surface of the paper is indicated by 2, and the lower surface of the paper is indicated by 1. In FIG.

On the other hand, in the duplex printing mode, a plurality of sheets of paper are loaded into one of the paper feed cassettes 110 and 112, and the uppermost paper P is aligned by the pickup roller and the finger not shown in the drawing. Is transferred to the After the ends of the paper are aligned, the bottom surface of the paper is first copied through the developing unit 130 and the fixing unit 140.

At this time, the paper path guide lever 143 is rotated by the detection of an optical sensor not shown in the drawing, and is then guided to a separate paper path by the lever 143. Subsequently, the paper on which only one side is printed passes through the discharge roller 152, and the rear end of the paper is sensed while passing through the discharge roller 152 so that the discharge roller 152 reversely rotates, and then the reverse roller reversely rotates. By a separate paper path (155). The paper copied only on one side is directed toward the alignment roller 124 which is the initial position by the plurality of transfer rollers 160, 162, 164 and 166. The paper is aligned with the tip of the paper by the alignment roller 124, and then the upper surface is printed by passing through the developing unit 130 and the fixing unit 140.

On both sides of the printed sheet, the paper path is guided by the lever 143, and then toward the discharge roller 152. Subsequently, the rear end of the paper is sensed while passing through the discharge roller 152, and then directed to a separate paper path 149 by reverse rotation of the discharge roller. This sheet is discharged to the discharge stage 150 by the final discharge roller 148.

In this case, the bottom surface of the paper is printed toward the bottom. In other words, it is face down. In the figure, the upper surface of the paper (the surface copied first) is denoted by 2, and the lower surface of the paper (the surface copied later) is denoted by 1. Several levers operating independently in this configuration are operated by the instructions of an optical sensor, not shown.

But. The duplex printing device having the above-described configuration is required to configure a separate paper reversal path because the paper is loaded on the output tray face down in order to improve the memory efficiency of the computer system. There is a structural problem that requires the installation of the lever. Since such a paper path guide lever or paper path is required, a problem arises in that the system becomes bulky. Moreover, the printing of the image printing order on the photosensitive drum of the developing device could not be performed in the order of sending from the PC, resulting in a problem of low memory efficiency. That is, when one sheet of paper is fed and developed, the next sheet of paper is not fed after being discharged to the output tray, but one sheet of paper is continuously fed, and when such paper is developed, the next sheet of paper is fed. The problem was that the memory efficiency of the computer was lowered because it was directed toward the developer.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a discharge mechanism of the duplex printing apparatus, which is advantageous for miniaturization of the entire system.

Another object of the present invention is to provide a discharge mechanism of the duplex printing apparatus capable of stacking paper face down.

Another object of the present invention is to provide a discharge mechanism of the duplex printing apparatus which can improve the memory efficiency by printing the image printing order on the photosensitive drum of the developing machine in the order of sending from the PC.

In order to achieve the above objects, the present invention is a double-sided printing apparatus using an electrophotographic development method having a discharge mechanism including a pair of discharge roller,

A pair of discharge rollers engaged with each other to discharge the paper by the drive unit;

And a pair of discharge rollers, positioned between the drive unit and the pair of discharge rollers, installed to rotate coaxially with the axis of the drive unit, and selectively shifting the pair of discharge rollers to the drive unit. A disc-shaped member that can be rotated to be loaded face down;

A friction plate attached to one side of a gear of a discharge roller to transfer power of the drive unit to the disc-shaped member;

A compression coil spring disposed between the friction plate and the disc-shaped member and installed coaxially with the pair of discharge rollers to closely adhere the friction plate in one direction; And

It is composed of a solenoid is installed in conjunction with the outer peripheral surface of the disk-shaped member to selectively block the power transmission between the disk-like member and the drive unit by the detection of the current by the sensor.

1 is a schematic view showing a duplex printing apparatus according to a conventional embodiment

Figure 2 is a schematic view showing a duplex printing apparatus according to an embodiment of the present invention

Figure 3 is a block diagram showing the media mechanism according to an embodiment of the present invention from the front

Figure 4a is a side view showing a medium mechanism of the pre-operation state according to a preferred embodiment of the present invention

Figure 4b is a side view showing a medium mechanism of the post-operation state according to an embodiment of the present invention

Hereinafter, with reference to the accompanying drawings will be described in detail the most preferred embodiment of the present invention. First, in describing each of the drawings, only the same components have the same reference numerals as much as possible even if shown on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Figure 2 is a schematic diagram showing a duplex printing apparatus according to an embodiment of the present invention. The duplex printing apparatus of the present invention can selectively perform single-sided copying or double-sided copying according to the user's will.

In order to face down the duplex copying, a discharge mechanism 50 is installed. The mechanism 50 is installed just before the discharge tray 150 for the final discharge of the paper. If the configuration of such a medium mechanism 50 is roughly referred to with reference to FIG.

A pair of discharge rollers 510 for discharging paper, a drive gear 520 engaged with the discharge roller gear 512 to transmit power to one discharge roller gear 512 of the discharge rollers 510, and A disk-shaped member 501 including a pair of discharge rollers 510 and fixed to the frame and installed between the discharge roller 510 and the discharge roller gear 512 in a coaxial direction with the axis of the drive gear 520; A solenoid 70 installed on the outer circumferential surface of the disc-shaped member 501 to block rotation of the disc-shaped member 501, a friction plate 502 provided on one side of the discharge roller gear 512, and It is comprised between the friction plate 502 and the disk-shaped member 501, and the compression coil spring 503 etc. which are penetrated by the discharge roller shaft. Each of the components of this medium mechanism 50 is interlocked.

When the drive gear 520 rotates, the discharge roller gear 512 meshed with the gear 520 rotates, and the discharge roller 510 rotates. At this time, the disc-shaped member 501 does not rotate by the actuator of the solenoid 70. Therefore, the paper discharge roller 510 rotates to discharge the paper.

On the other hand, when the rear end of the paper is sensed by the detection of the sensor and the current is applied to the solenoid 70, the actuator comes into contact with the solenoid 70, and then the disc-shaped member 501 is free from the solenoid 70. .

Therefore, when the drive gear 520 rotates to load the paper face down, the discharge roller gear 512 rotates simultaneously, and the disc-shaped member is caused by the elastic force of the friction plate 502 and the compression coil spring 503. 501 also rotates. Since the drive gear 520 has a fixed shaft and the discharge roller gear 512 is not a fixed shaft, the discharge roller gear 512 rotates while rolling along the drive gear 520. At this time, it rotates about 180 degrees by the stopper of a disk-shaped member. The operation of this media mechanism will be described in detail below.

As shown in Figure 2, in the normal mode where only the cross section is copied,

A plurality of sheets of paper is loaded into the paper feed cassettes 10 and 12. The topmost sheet of paper loaded in one of the paper feeding cassettes is sequentially fed sheet by sheet by the pickup rollers 20 and 22 and fingers not shown in the drawing. The sheet of paper arrives at the alignment roller 24 to arrange the leading edge of the sheet. Then, after passing through the alignment roller 24, the toner is fixed to the lower surface of the paper through the developing unit 30 and the fixing unit 40. The toner is fixed by high heat and high pressure of the heating roller and the compression roller of the fixing unit 40. The paper on which only one surface is copied passes through the paper path 44 by the feed roller 42. At this time, the paper path is guided by the paper path guide lever 46, and is then discharged through the final discharge mechanism 50 to the discharge tray 51. The paper is stacked in the order in which the copied surface is face down and is copied to the discharge tray 51.

On the other hand, in the duplex copy mode in which the copying process is carried out on both sides, the above-described discharge mechanism 50 operates differently. In the paper cassette loaded with a plurality of sheets, sheets are fed one by one by a pickup roller and a finger not shown in the drawing. Subsequently, the sheet of paper fed is trimmed by the alignment roller 24, and then the toner is fixed on the paper while passing through the developing unit 30 and the fixing unit 40. FIG. The toner is fixed by high heat and high pressure of the heating roller and the pressing roller of the fixing unit 40. The paper on which only one side is copied is directed toward the delivery mechanism 50 by the transfer roller 42 and the paper path 44, and the delivery roller is reversed by the detection of a sensor not shown while passing through the delivery roller of the delivery mechanism. Rotate The rear end of the paper is sensed by the sensor, and the reverse rotation is performed by the operation instruction of the sensor. Simultaneously, the paper path is guided by the lever 46 and passes through the paper path 52. This sheet is a state where only the bottom surface of the sheet is copied. Then, the paper passes through the paper paths 54, 56, 58 by the plurality of feed rollers 60, 62, 64, 66, 68, and reaches the alignment roller 24 which is the initial position.

Toner is copied onto the upper surface of the paper while the paper on which only one surface of which the tip is aligned by the alignment roller 24 is passed through the developing unit 30 and the fixing unit 40. In this state, both sides of the paper are copied.

The sheet of paper arrives at the dispensing mechanism 50 by the feed roller 42 and the paper path 44.

Referring to Figure 4a and 4b in detail the operation of the media mechanism as follows.

The discharge mechanism of the present invention is provided so that the upper surface of the paper is loaded face down. 4A is a state in which the discharge mechanism 50 is not in operation, and power transmission from the driving unit to the disc-shaped member 501 is blocked by the solenoid 70. Therefore, the disk-shaped member 501 cannot rotate by the solenoid 70. FIG. The stopper 5011 protruding in the circumferential direction is caught in the end of the actuator and cannot be rotated.

That is, the drive gear 520 rotates, and then the interlocking discharge roller gear 512 rotates, and then only a pair of the discharge roller 510 rotates. This is the state in the hibernation mode.

On the other hand, in the duplex copy mode, the paper P arriving at the discharge mechanism 50 passes through the discharge roller 510, and when the rear end of the paper is detected by a sensor not shown, power is supplied to the solenoid 70 simultaneously. Is approved.

Subsequently, an actuator simultaneously supported by the tension coil spring comes into contact with the solenoid 70, and the stationary state of the disc-shaped member 501 is released. Next, the disk member 501 rotates in the counterclockwise direction (arrow direction) by the friction plate and the compression coil spring.

The disc-shaped member 501 rotates by about 180 degrees, and the disc-shaped member 501 is stopped again by the actuator of the solenoid 70. The end of the actuator is located between the stoppers 5012. This state is the state of FIG. 4B. The end of the actuator while the disk-shaped member 501 rotates makes sliding surface contact along the outer circumferential surface. When the disc-shaped member 501 is rotated and rotation is again stopped by the actuator of the solenoid 70, the discharge roller 510 conveys the paper. Therefore, the paper is loaded into the discharge stand 51 in the face down state.

The discharge mechanism 50 described above is preferably installed on one side of the discharge roller 510, and is preferably provided on both sides of the discharge roller 510. In addition, this operation is repeated so as to face-down the paper.

As a result, the copying process is performed in the order sent from the computer to improve memory efficiency and to minimize the volume of the device.

On the other hand, in the detailed description of the present invention has been described with respect to specific embodiments, it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.

As described above, the present invention is advantageous in miniaturizing the equipment set by installing a separate discharge mechanism in the duplex printing apparatus using the electrophotographic development method and loading the paper face down, and is effective in maximizing PC memory efficiency. to be.

Claims (3)

In a two-sided printing apparatus using an electrophotographic development method having a discharge mechanism including a pair of discharge rollers, A pair of discharge rollers engaged with each other to discharge the paper by the drive unit; And a pair of discharge rollers, positioned between the drive unit and the pair of discharge rollers, installed to rotate coaxially with the axis of the drive unit, and selectively shifting the pair of discharge rollers to the drive unit. A disc-shaped member that can be rotated to be loaded face down; A friction plate attached to one side of a gear of a discharge roller to transfer power of the drive unit to the disc-shaped member; A compression coil spring disposed between the friction plate and the disc-shaped member and installed coaxially with the pair of discharge rollers to closely adhere the friction plate in one direction; And The current supply is determined by the detection of the sensor and the solenoid is installed in conjunction with the outer peripheral surface of the disk member to selectively block the power transmission between the disk member and the drive unit of the duplex printing apparatus, characterized in that Badge mechanism. The discharge mechanism of claim 1, wherein at least one stopper protrudes in the circumferential direction at a predetermined position on the outer circumferential surface of the disc-shaped member so as to cooperate with the solenoid. 3. The discharge mechanism of claim 2, wherein the stoppers are formed symmetrically at opposite positions and have inclined surfaces on only one side of the stopper.

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