JPH01113770A - Both-surface recorder - Google Patents

Abstract

PURPOSE:To effectively print on both surfaces by providing a carrier path for feeding paper to a printing forming position, a carrier path for selectively transmitting the paper and a movable carrier path for taking in the recording paper by rocking a transmission path and transmitting the recording paper. CONSTITUTION:The recording paper 2 passes a recording paper supply path 51 and is printed and fixed in the printing forming position 1 and a fixing device 7 to be transmitted to a 2nd carrier path 8. In case of both-surface recording, the recording paper is transmitted to a recording transmission path 82 by a traveling switching lever 9 and carried in the movable carrier path 20. Then the second sheet of recording paper is transmitted from a tray 3 to be printed. During the above-mentioned actions, a motor 22 is driven to the normally rotated and the carrier path 20 is moved to a position communicating a recording paper supply path 52 so as to resupply the paper to the printing forming position 1 in a state here a surface and a back surface are inverted. When the first sheet of recording paper where the printing on the both surfaces is completed gets out of the device 7, the lever 9 is switched and the paper is ejected to a paper ejection tray 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a double-sided recording device that prints on both sides of a sheet of recording paper.

(Prior Art) Some conventional technologies perform so-called double-sided copying in which images are formed on both sides of a sheet of copy paper. In this case, the copy paper is sent to the copy processing section, and after copying on one side, the paper is turned over and sent to the copy processing section again.

An example of a copy paper feeding device for this purpose is a paper feed tray that stacks and stores new copy paper that has not yet been copied, and feeds the copy papers in this paper feed tray one by one to a copy processing section. a first feeding device; a reversing device having a conveyor belt that curves and conveys the copy paper that has been fed to the copying processing section and has a copy image formed on one side, in order to reverse the sheet; Some printers include an intermediate tray that takes in copy paper, and a second feeding device that feeds the copy paper in the intermediate tray one by one to a copy processing section.

(Problems to be Solved by the Invention) The conventional structure as described above has the drawback of high cost due to the large number of parts and complicated configuration.

Furthermore, since the recording paper, which has been reversed from front to back by the reversing device, is once taken into the intermediate tray and then fed again, it takes time to convey the recording paper, and there is a problem that the double-sided printing speed decreases as a whole.

A first object of the present invention is to improve double-sided printing speed.

A second object of the present invention is to reduce the number of parts of the double-sided printing mechanism to reduce manufacturing costs.

(Means for Solving the Problems) A feature of the present invention is that the present invention includes at least two or more recording paper supply paths, and a first conveyance system that transports the recording paper supplied from each recording paper supply path to a print forming position. a second conveyance path that includes at least two or more recording paper delivery paths and that selectively sends out the recording paper printed at the print forming position; , the other end swings between one of the recording paper feeding paths and one of the recording paper feeding paths, takes in the recording paper from one of the printing paper feeding paths, and transfers the recording paper to one of the printing paper feeding paths. It is equipped with a movable conveyance path for sending out,
The movable conveyance path is provided with a drive roller that is driven to rotate in the normal direction when the recording paper is taken in and driven in the reverse direction when the recording paper is sent out.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows an embodiment applied to an electrostatic transfer type recording device. A print forming position 1 for recording data stored in a data buffer on a recording paper according to an address signal sent from a central processing unit includes a photosensitive drum 11 and a transfer means 12. A charging device 13. Electrostatic latent image forming device 14.
Developing device 15. Transfer means 12. A cleaning device 16 and a static eliminator 17 are provided in this order. The unprinted recording paper 2 is stocked in a stacked state in the recording paper tray 3 and is supplied to the first conveyance path 5 via the supply path 51 .

Note that the first conveyance path 5 has a supply path 52, which will be described later, in addition to the supply path 51, and thus has two supply paths. The recording paper 2 supplied to the first conveyance path 5 is conveyed to the print forming position 1 by conveyance rollers 53 .

A shutter 6 is disposed before reaching the print forming position 1 and detects the leading edge of the recording paper 2. The photosensitive drum 11 rotates in accordance with this detection signal, the recording paper 2 is fed to the print forming position 1, and the photosensitive drum 11 is moved by the transfer means 12.
The upper developed image is transferred onto the recording paper 2. A fixing device 7 is provided at a position outside the print forming position 1. The fixing device 7 fixes the toner image transferred to the recording paper 2 by heat fixing, pressure fixing, or the like.

The recording paper 2 with a print formed on one side is sent out from the fixing device 7 to a second conveyance path 8 including two recording paper sending paths 81 and 82, and is conveyed by conveyance rollers 83 . A feed switching lever 9 is arranged at a branch position between the recording paper feed paths 81 and 82. That is, when printing is performed on one side and subsequently on the other side, the lever 9 is positioned in the position shown by the solid line in Figure 1 due to the signal, so the recording paper 2 is placed in the recording position. The paper is fed into the paper delivery path 82. In the case of single-sided printing, since the travel switching lever 9 is in the position shown by the chain line in FIG.

As shown in Figure 1.2, the movable conveyance path 20 has one end (
The lower end portion) is pivotally supported by a shaft 21 and is swingable.

As shown in the second diagram, the shaft 21 has a motor 2 that can freely rotate in forward and reverse directions.
2 is transmitted through the gears 23 and 24, the other end (upper end) of the movable conveyance path 20 is located between the recording paper delivery path 82 and the recording paper supply path 52 with the shaft 21 as the center. oscillate. The movable conveyance path 20 is provided with a drive roller 25 and a pinch roller 26 that comes into elastic contact with the drive roller 25. The drive roller 25 is fixed to a shaft 27 that is rotatably supported on the side plate of the movable conveyance path 20, and the shaft 27 receives a driving force from a motor (not shown) that can freely rotate in forward and reverse directions. belt 2
8. It is transmitted via the pulley 29 and gears 30, 31, and rotates the conveying roller 27 in forward and reverse directions. The shaft 32 to which the pulley 29 and the gear 30 are fixed is rotatably supported by a support plate (not shown) that swings together with the movable conveyance path 20. The drive roller 25 is driven to rotate normally when the other end of the movable conveyance path 20 faces the recording paper feed path 82 as shown by the solid line in FIG. As shown in the figure, when facing the recording paper supply path 52, the recording paper 2 is driven in reverse to the movable conveyance path 20.
send it out from

Next, the operation of an example of double-sided recording will be described. The first sheet of recording paper fed from the recording paper tray 3 passes through the recording paper supply path 51 and is printed on its surface (first page) at the print formation position 1, and then fixed by the fixing device 7 and printed on the second page. It is sent out to the conveyance path 8. At this time, in the case of double-sided recording, since the travel switching lever 9 is at the position shown by the solid line, the recording paper is sent to the recording paper delivery path 82 and carried into the movable conveyance path 20. At this time, the drive roller 25 is driven to rotate normally and takes the recording paper into the movable conveyance path 20. Then, the second sheet of recording paper from recording paper tray 3 follows the same path as above.
The paper is sent to the print forming position 1, and print is made on the surface (third page). During this printing, the movable conveyance path 20 is swung counterclockwise by the forward rotation of the motor 22, and is moved to a position where the other end communicates with the recording paper supply path 52. After printing the third page described above, the drive roller 25 is driven in reverse, and the first sheet of recording paper that was waiting in the movable conveyance path 20 is now printed with its front and back reversed through the recording paper supply path 52. It is fed again toward the forming position 1. Next, when the movable conveyance path 20 is returned to its original position by reverse driving of the motor 22, the second recording paper on which the third page has been printed comes out of the fixing device 7 and is moved through the feed path 28 to the movable conveyance path 20. 20. During this time, printing is performed on the back side (second page) of the first sheet of recording paper that has been fed to print forming position 1. When the first sheet of recording paper on which both sides have been printed leaves the fixing device 7, the travel switching lever 9 has been switched to the position shown by the chain line, so that the first sheet of recording paper on which both sides have been printed is placed in the output tray. It is discharged to 10.

By switching the travel switching lever 9, the third recording paper is supplied from the recording paper tray 3, and the fifth page is similarly printed on its surface. In the same manner, unprinted recording paper from the recording paper tray 3 and recording paper with prints on the surface from the movable conveyance path 20 are alternately supplied to the recording paper supply path 51 or 52 to the print forming position. 1, printing is done on the top or back side of the paper, and the recording paper feed path 82 or 8
1 is sent out alternately. As a result, printing is performed in the order of 1st page - section 3rd page -> 2nd page -> 5th page -> 4th page -> 7th page -> 6th page, and so on.

Note that the order of double-sided printing is not limited to the upper side;
The configuration may be such that after the first and second pages are printed on the front and back sides of the second recording paper, the second recording paper is printed.

Also, to prevent the top and bottom from being reversed on the front and back,
Correct printing is easily possible by sending address signals from the central processing unit in the reverse order of the front.

(Effects of the Invention) The present invention having the above configuration is capable of efficiently performing double-sided printing with a simple configuration because a movable conveyance path for reversing the recording paper is provided between the first and second conveyance paths. Printing time can be shortened, and the number of parts can be reduced, reducing manufacturing costs.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic configuration diagram, and FIG. 2 is a perspective view of a movable conveyance path. DESCRIPTION OF SYMBOLS 1... Print formation position, 2... Recording paper, 5... First conveyance path, 51.52. Recording paper supply path, 8... Second conveyance path, 81.82. ...Recording paper sending path, 20...Movable conveyance path, 25...Φ drive roller. that's all

Claims (1)

[Scope of Claims] A first conveyance path that includes at least two or more recording paper supply paths and feeds the recording paper supplied from each of the recording paper supply paths to a print forming position; and at least two or more recording paths. a second paper feed path, which selectively sends out the recording paper printed at the print forming position;
one end is swingably supported, the other end swings between one of the recording paper supply paths and one of the recording paper delivery paths, a movable conveyance path that takes in recording paper from one of the recording paper supply paths and sends out the recording paper to one of the recording paper supply paths;
A double-sided recording device characterized by being provided with a drive roller that is driven in reverse when recording paper is sent out.