JPS63165232A - Recording device - Google Patents

Abstract

PURPOSE:To arrange the recording paper sheets in the page order by sending the recording paper which is supplied from an intermediate paper feeding part to a discharge part after the reversal in a reversal part. CONSTITUTION:Wen a paper sheet printed on one side reaches a switching part 9, it advances to a reversal part 7 and reaches the point E. When it is detected that the edge part of the paper passes through the switching part 9, paper feed is suspended, and reverse revolution is started, and the rear edge which forms the top edge passes through the point F, and is stacked into an intermediate paper feeding part 8. Then, paper feed is started from the intermediate paper feeding part 8, and the paper sheet is sent into an image forming part 4 again, passing through a passage G. A toner image is printed onto the back surface side, and the sheet reaches the switching part 9 through a fixation part 5 after passing through the passage C. The paper sheet is sent into the reversal part 7 by the operation of the switching part 9, and when the paper sheet reaches the passage E, the paper sheet is sent to the position D after passing through the passage H by the reverse revolution. Therefore, a paper sheets can be stacked in the page order.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording apparatus, such as a printer or a copying machine, which is equipped with a paper discharge section that reverses and discharges printed recording paper to the outside of the machine.

Prior Art The recording device of the above type is of the R type. As shown in Figure 9, this type of recording device uses the so-called face-down stacking method, in which the recording paper that has been printed on one side is reversed and discharged at the paper ejection section, so that the recording paper recorded on the pages is stacked in the order in which it is printed. The paper is ejected with the back side facing up (Fig. 10).

The applicant has also proposed a recording device equipped with a double-sided printing function.

However, if the recording paper that has been printed on both sides is discharged as it is through the paper discharge section, there is a problem (1) and (b) that even when pages are recorded, they are not arranged in the order shown in FIG. 11.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording apparatus which solves the above-mentioned problems and can arrange recording sheets recorded on pages in the same order regardless of whether they are printed on one side or both sides.

In addition, the present invention has a reversing section that reverses the recording paper after printing on one side, and an intermediate paper feeding section that stacks the reversed recording paper and refeeds the paper for printing on the other side. However, this was achieved by re-feeding the recording paper from the intermediate paper feeding section, inverting it through the reversing section, and then sending it to the ejecting section.

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

FIG. 1 is a schematic diagram of a recording apparatus configured as a laser printer, in which paper is fed from the first paper feed section 2 or the second paper feed section 3 of the printer main body 1, and is transferred to the image forming section 4. The toner image is transferred, fixed by a fixing section 5, and sent to a paper discharge section 6. The paper ejection unit 6 is of a face-down stack type and ejects the paper so that the image surface is facing downward. In addition,
Although a sorter is attached to the paper discharge section 6 in this example, the paper may be stacked on a paper discharge tray.

The laser printer configured as described above includes a reversing section 72 for reversing the paper printed on one side, and an intermediate paper feeding section 8 for stacking the inverted paper and refeeding the paper for printing on the other side.

In the laser printer configured as described above, when two-sided printing is selected, paper fed from the first or second paper feed section 2.3 passes through path A or B and is transferred by the image forming section 4. is sent through the path C to the fixing section 5 and then to the path by the switching section 9, which will be described in detail later.
Gets stuck facedown.

Next, when double-sided printing is selected, the process is the same as above until the paper with single-sided printing passes the fixing unit 5, but when the paper reaches the switching unit 9, it advances to the reversing unit 7 and reaches position E. reach Here, when it is detected that the foot end of the paper has passed through the switching unit 9, the paper feed is stopped and then reverse rotation starts, passing through the trailing edge side or the leading edge F, and being stacked in the intermediate paper feeding unit 8. be done.

Next, the paper is re-fed from the intermediate paper feed section 8, and the paper passes through G and is sent to the image forming section 4 again. Here, the toner image is transferred to the back side, passes through C, and is transferred to the switching unit 9 via the fixing unit 5.
reach.

Here, if the paper is simply sent through D to the paper discharge section 6, a problem arises in that when printing on pages as described above, the sheets are not aligned on the pages.

Therefore, in the present invention, the paper is printed on both sides and sent to the reversing part 7 by the operation of the switching part 9, and when it reaches E, it is sent through H and to D by reverse rotation.

With this configuration, the first printed side of the paper for double-sided printing discharged to the paper discharge section 6 will be the bottom side, and even if multiple double-sided printing is performed on the pages, the pages will not be printed as shown in FIG. can be stacked.

By the way, the switching section 9 switches the paper that has passed through the fixing section 5 to the paper ejection section 6 and the reversing section 7, and switches the paper that has passed through the reversing section 7 to the intermediate paper feed section 8 and the paper ejection section 6. It is necessary to perform switching, and FIGS. 3 to 5 show an embodiment of a switching section 9 that enables the above-mentioned switching.

In FIG. 3, the switching section 9 has a first switching pawl 10 and a second switching pawl 11, and the first switching pawl 10 is used to switch the paper sent from path C to path E. , the second switching pawl 11 serves to switch from the path E to the path F and then to the path D via the path H.

The first switching pawl 10 is fixed to a support shaft 12 rotatably mounted on a frame (not shown), and a screw 13 is attached to the support shaft 12 at a position outside the paper path as shown in FIG. One end of 14 is fixed. A plunger 15a of an electromagnet 15 is connected to the center part of the bracket 14, and a fourth plunger 15a is connected to the other end when the electromagnet 15 is demagnetized.
A spring 16 is locked to maintain the state shown in the figure. 1st
At the top of the switching claw 10, there is a pin 1 as shown in FIG.
7 is provided, and this pin 17 is engaged with a groove of a fork portion 18 formed at the lower part of the second switching pawl 11.

The second switching pawl 11 is rotatably supported on the shaft 19 (
Figure 3).

Here, when the paper is sent from the path C to the paper discharge section 6 for single-sided printing, the electromagnet 15 is demagnetized. At this time,
The bracket 14 is held in the position where the plunger 15a of the electromagnet 15 is extended by the action of the spring 16, and the first switching claws 11 are held in the positions indicated by solid lines in FIG. 3, respectively. Therefore, the paper sent from the path G passes through the right side of the first switching pawl 10 and the second switching pawl 11 and is sent to the path.

Next, when paper is sent to the intermediate paper feed section 8 via the reversing section 7 for double-sided printing, the electromagnet 15 is energized.

The bracket 14 rotates together with the support shaft 12 in the counterclockwise direction in FIG. Due to this rotation, the first switching pawl 10 is rotated to the position shown by the chain line, and the pin 17 is also rotated counterclockwise.
Accordingly, the second switching pawl 11 rotates clockwise around the shaft 19 and reaches the position shown by the chain line.

Thus, when the first and second switching claws 10.11 move to the positions indicated by the chain lines, the paper conveyed from the path C passes to the left of the first and second switching claws and is sent to the reversing section 7. and,
When the trailing edge of the paper is detected by the sensor 20,
After the reversible rollers 21 holding the paper stop, the paper is reversed. At this time, the paper is sent to the path F by holding the first and second switching claws io and ti at the positions indicated by the chain lines.

Next, when the paper is sent from the path C again after one-sided printing is completed, the electromagnet 15 is energized, and the paper is sent to the reversing section 7 in the same manner as described above. Then, when the trailing edge of the paper is detected by the sensor 20, the reversible roller 21 rotates in the reverse direction, and the electromagnet 15 is demagnetized. As a result, the first and second switching claws 10.11 return to the positions indicated by solid lines, and the paper passes through the path H along the upper curve of the second switching claw 11 to the paper discharge section 6.
sent to.

Thus, the switching part 9 can obtain the operating position with one electromagnet 15 by adapting the two switching claws 10, 11 according to the invention.

Next, specific examples of the double-sided unit provided according to the present invention are shown in FIGS. 6 and 7.

The paper conveyed to the duplex unit for printing is passed through the entrance roller 41. After passing through the switching claw 42, the paper is discharged toward the intermediate tray 44, where the discharge position is selected by the shank discharge gate section 32, which has a plurality of switching claws that switch the discharge position depending on the paper size. The ejected paper is conveyed by a shifting roller 46 until it reaches a stopper 47 releasably provided at the front end of the intermediate tray, and then a jogger unit 45 is provided with a jogger fence 62 that is moved left and right by a jogger motor 61. Due to the lateral position! The positioning is completed.

After the stopper 47 is released, the paper re-feeding unit 33 starts re-feeding the aligned paper, and the intermediate roller 49 and ball discharging roller 50 re-feed the paper to the printer main body 1 via the outlet 0UT1.

As shown in FIG. 8, the above-mentioned shifting roller 46 is connected to a solenoid 65, and when the solenoid is turned on, the shifting roller 46 rises and separates from the paper surface (or the tray surface), and when it is turned off, it falls under its own weight. Press it against the paper surface.

In addition to refeeding paper for double-sided recording, for double-sided printing, the recording paper is carried into the printer body 1 via the entrance IN1 from a large-volume paper feed unit (not shown), passes through the printer body 1 and the reversing unit 6, and prints the recording paper on both sides of the book. The recording paper returned to the unit is
In order to convey the job to a job stacker (not shown), the direction is switched by the switching claw 42.

The above-mentioned duplex unit is in a mode (referred to as stack mode) in which a predetermined number of sheets of paper printed on one side are stacked on the intermediate tray, and then the stacked sheets are re-fed one by one.
and a mode (referred to as a through mode) in which sheets are continuously conveyed and re-feeded without stacking.

In the stack mode, when the alignment of one sheet of paper is completed, the jogger motor 61 rotates again, and the jogger fences 62 on both sides are moved to a position, for example, 15+nm outward from the predetermined paper alignment position, in preparation for the entry of the next sheet. At the same time, the solenoid 65 for the shifting roller is turned off as shown in FIG. 8, and the shifting roller 46 is returned to the plane of the paper.

This operation is repeated by the number of rotations corresponding to the predetermined number of stacked sheets, and when the stacking operation of the last sheet is completed and a command to start refeeding is received, the stopper 47 is released and the jogger motor 61
rotates, moves the jogger fence 62 to the position of the side edge of the paper stack to prevent the paper from skewing, and operates the paper refeed unit 33, which includes a pickup solenoid (not shown), paper feed clutch, etc., to feed the paper. At this time, the shifting roller lenoid 65 is turned on so that the shifting roller 46 does not become a load for paper feeding. When the last paper is fed and a paper end sensor (not shown) detects that there is no paper left.

In preparation for the entry of the next sheet, the jaw fence 62 opens, for example, 15 nm+ to the side from a predetermined sheet side edge position, and the shifting colonnoid 65 is turned off. Also, the stopper 47 returns to its operating position.

When performing double-sided printing using the operations explained above,
As described above, the movement of the jogger fence 62, the operation of the pickup solenoid, and the paper feed clutch are required between the completion of stacking the last sheet of one-sided recorded paper and the printing of the first sheet of reverse-side recording. There are problems in that it takes time to print, a large number of sheets are stacked, and if a jam occurs when refeeding the paper, it is very difficult to recover the contents of that page.

Therefore, it is equipped with a through mode that can solve this problem.

In the through mode, the operation until a sheet of paper recorded on one side is fed into the duplex unit 7 and aligned with the jogger fence 62 is the same as in the stack mode.

However, in the through mode, the paper is fed after the paper is aligned, so the jogger fence 62 maintains the position of the paper side edge according to the paper size, and it takes a long time to accept the paper feed command. Minutes, the gap between the paper and the next paper gets smaller.
In order to prevent the next paper alignment operation from being disturbed and floating, the paper feed clutch, pickup solenoid, etc. are turned on in advance to perform preliminary paper feeding before receiving a paper feeding command. When the paper feed command is accepted, the paper feed clutch, pickup solenoid, etc. are turned on, and then, at the timing when the paper is fully gripped by the intermediate roller 49, the jogger fences 46 on both sides are opened by, for example, 15 steps, and the next When paper enters, it is prevented from getting caught on the jogger fence 46. Repeat the above operation until the final paper.

The stopper 47 is released when preliminary paper feeding starts, and returns when the paper end sensor indicates that there is no paper. Since the jogger fence 46 is closed until the paper reaches the intermediate roller 49, the paper will not be skewed.

As described above, when the through mode is selected, the single-sided recorded paper is aligned in the intermediate tray and then stacked, so there is no need to move the jogger fence, operate the pickup solenoid, or operate the paper feed clutch during that time. The time it takes to send out the paper can be shortened. In addition, if a jam occurs during printing on the back side, the contents of the print on both the front and back sides of the paper are those that were input immediately before the jam, so it is extremely easy to recover.

As mentioned above, by providing two types of transport modes with the same duplex unit, the number of sheets required by the user,
The book can be used in a variety of ways depending on the number of copies, print types, etc.

According to the present invention, both single-sided and double-sided recorded paper can be discharged and stacked into pages.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a recording device of the present invention, FIG. 2 is an explanatory diagram illustrating the order of sheets for double-sided printing stacked according to the present invention, and FIG. 3 is a diagram showing a switching method applied to the present invention. FIG. 4 is an explanatory diagram showing the drive section, and FIG.
The figure is a partially enlarged view of Figure 3, Figures 6 to 8 are explanatory diagrams showing an example of a duplex unit, Figure 9 is a diagram showing the operation of a conventional recording device, and Figure 10 is a single-sided recording device. FIG. 11 is an explanatory diagram showing the stacked paper order for printing, and FIG. 11 is an explanatory diagram showing the paper order for double-sided printing. 1...Printer 6...Paper discharge section 7...Reversing section 8...Intermediate paper feeding section 9...Switching section 3 included t, t.

Claims (1)

[Scope of Claims] A recording device equipped with a paper ejecting section that inverts the printed recording paper and discharges it outside the machine, comprising: a reversing section that inverts the recording paper that has been printed on one side, and the inverted recording paper. and an intermediate paper feeding unit that stacks the recording paper and refeeding the paper for printing on the other side, and after the recording paper re-fed from the intermediate paper feeding unit is reversed via the reversing unit, the recording paper is The recording device is characterized in that the recording device is sent to a discharge section.