JPS6366036A - Automatic duplex copying machine - Google Patents

Abstract

PURPOSE:To correct the curl of a sheet by providing a pair of the upper and lower transfer rollers with heater on the sheet transfer path to a middle tray and selectively controlling the energization of the heater of each roller depending on whether the operation of a reverse transfer means is enabled or disabled. CONSTITUTION:An automatic duplex copying machine has a main transfer section from a sheet feed section 30 to a sheet discharge section 32 via a copying process section 26 and an auxiliary transfer section from the sheet discharge section 32 to the sheet feed section 30 via a sheet reverse section 38 and a middle tray 2 in sequence. In this case, a pair of transfer rollers 1a, 1b with heater are provided on the sheet transfer path to the middle tray 2. If the operation of a sheet reverse section 38 is enabled according to the output signal of a multiplex copying mode selection means selectively inputting whether to enable or disable the sheet reverse section 38 when a sheet passes the auxiliary transfer path, the heater of the lower transfer roller 1b is energized; on the other hand, if the operation of the sheet reverse section 38 is disabled, the heater of the upper transfer roller 1a is energized.

Description

DETAILED DESCRIPTION OF THE INVENTION (AL Industrial Field of Application) This invention relates to a main conveyance path for conveying paper from a paper feed section through a copying process section to a paper discharge section, and a sub-conveyance path from the paper discharge section to the paper feed section. The present invention relates to an automatic double-sided copying machine that enables composite copying or double-sided copying by having a conveyance path and a reversing conveyance means that is enabled or disabled by a multiple copy mode selection means on the conveyance path.

(b1 Summary of the Invention The automatic double-sided copying machine according to the present invention has a reversing conveyance means for reversing the paper on which an image is formed on the first side in the sub-conveyance path. When the operation of the reversing feeding means is enabled by the multiple copying mode selection means for selecting the copying mode (copying mode), the heater-equipped conveying roller installed in the sheet 1, 1ffi feeding path in front of the intermediate tray is activated. The heater of the lower roller is energized, and the heater of the upper roller is energized when the operation of the reversing roller feeding means is disabled.This allows the first When the paper with the side copied passes through the heated transport roller, the back side of the copy side is heated, correcting the curl of the paper that occurred during the first fixing of the copy side of the paper, and during duplex and composite copying operations. This is to prevent troubles such as jams.

(C1 Conventional technology) In general, an automatic double-sided copying machine has a main conveyance path from a paper feed section to a paper discharge section via a copy process section, and a sub conveyance path that connects the paper discharge section and the copy process section. This sub-feed path is provided with a paper reversing means and an intermediate tray in this order.The paper reversing means is enabled or disabled by the multiple copy mode selection means.In other words, when double-sided copy mode is set, the first Since it is necessary to reverse the paper surface facing the photoreceptor surface when passing through the first copying process and during the second pass, the paper is passed through a paper reversing means, and when the composite show-through mode is set, the paper is passed through a paper reversing means. Instead, the first sheet of paper is made to face the photoreceptor again with its top and bottom surfaces in the same direction.

As a result of the paper reversing means being enabled or disabled depending on the mode as described above, in the intermediate tray, the sheets are stacked one after another in the duplex copying mode with the copying side facing up and in the composite copying mode with the copying side facing down. Stored temporarily. When the next copying cycle begins, the temporarily stored paper is fed by a paper feeding roller disposed in the paper feeding section of the intermediate tray and conveyed to the copying process section.

(d1 Problem to be Solved by the Invention) However, since the amount of heat applied to the upper roller of the fixing roller is normally set to be larger than that of the lower roller, in the conventional automatic double-sided copying machine, the first During the copying process, the copy side (front side) of the paper is heated more than the back side by the fixing roller when it passes through the fixing section, and as a result, the moisture content on the copy side is reduced compared to the moisture content on the back side.
Paper is curled and stored in the intermediate tray. Therefore,
This curled paper causes troubles such as paper jams when stored in the intermediate tray or during the second copying operation when the paper is fed from the intermediate tray. Furthermore, if the paper is sent to the copying process section while curled, white spots on the leading edge of the paper, stains from the peeling nails, fusing wrinkles, etc.
It also had the disadvantage of causing various problems such as folding.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, an object of the present invention is to provide a pair of heater-equipped conveyance rollers in a paper conveyance path for conveying single-sided copying paper to an intermediate tray, and to When selected, depending on each mode, the heater type selectively turns on the heaters of the upper and lower rollers of the feed roller to heat one of the upper and lower rollers, correcting paper curls and preventing paper from being stored in the intermediate tray. Provides an automatic double-sided copying machine that prevents problems such as paper jams during the second copying operation, and also prevents problems such as white spots at the leading edge of the paper, peeling nail stains, fixing wrinkles, and creases. It's about doing.

(Means for Solving Problems 81) This invention provides a main conveyance path from a paper feed section to a copy process section to a paper discharge section, a reversing conveyance means for selectively reversing the conveyance direction of paper, and A sub-conveyance path that passes through intermediate storage trays in order from the paper discharge section to the paper feed section, and a multiplex function that allows you to select and input whether to enable or disable the reversing conveyance means when paper passes through the sub-conveyance path. In an automatic double-sided copying machine equipped with a copy mode selection means, a sheet is installed in the paper 1 general feed path that conveys paper to the intermediate tray,
a pair of heated conveyor rollers each having a heater that is selectively energized, and a heater for the lower white roller of the heated conveyance rollers when the operation of the reversing conveyance means is enabled by the multiple copy mode selection means. The present invention is characterized in that it is provided with heater selection means that energizes the heater of the upper roller when the operation of the reversing 1 forwarding means is disabled.

(f) Function The automatic double-sided copying machine according to the present invention enables or disables the reversing conveyance means according to the mode selected by the multiple mode selection means, and when the reversing conveyance means is enabled (double-sided copying mode). In this step, the heater of the white lower roller of a pair of heated conveyance rollers installed in the paper conveyance path of the intermediate tray is energized. In this way, the paper on which the image has been transferred in the copying process section and fixed in the fixing section is conveyed to the heater-equipped conveyance roller with the copy side facing up via the paper reversing means. In this heater-equipped conveyance roller, the lower roller heats the back side of the copy side to make the back side have the same moisture content as the copy side, thereby correcting curls that occur when fixing the paper. Further, when the reversing conveyance means is disabled (composite copying mode), the heater of the upper roller of the conveyance roller equipped with a heater is energized. In this way, the paper on which the image has been transferred in the copying process section and fixed in the fixing section is transported with the copy side facing down to the heater-equipped transport roller without passing through the paper reversing means. In this heater-equipped conveyance roller, the upper roller heats the back side of the copy side to make the back side have the same moisture content as the copy side, thereby correcting the curling of the paper caused by the fixing section. That is, whether in the double-sided copy mode or in the composite copy mode, the back side of the copy side of the paper that has undergone single-sided copying is heated while being conveyed to the intermediate tray.

tg) Embodiment FIG. 1 CA) is a schematic configuration diagram showing the configuration of an automatic double-sided copying machine which is an embodiment of the present invention. FIG. 1(B) is a partial sectional view showing the main parts of the copying machine.

A document table is provided on the top surface of the copying machine main body 21, and an automatic document feeder 22 is mounted on the top of the document table.

A phosphor drum 25 is provided at the center of the interior of the copying machine main body 21, and a copying process section 26 is configured. On the right side of the copying process section 26, there is constructed a paper feeding section 30 that includes a paper feeding tray 27 and paper cassettes 28 and 29. On the other hand, a paper ejection roller 31 is located on the left side of the copying process section 26.
A paper discharge section 32 is configured.

A sorter 23 is attached to the outside of the paper discharge section 31 of the main body 21 of the copying machine. The sorter 23 is provided with a plurality of bins 33 in multiple stages. Upper paper ejection roller 34 inside the sorter 23
sends the ejected paper to the bin 33. A flapper 35 is provided on the paper and feeding path above the sorter 23. This flapper 35 distributes the paper to either a lower conveyance path 36 or a paper discharge roller 34. Below the conveyance path 36,
A flapper 37 is provided for sorting the sheets to a path to a sheet reversing section 38 provided at the bottom of the sorter or to a path of the cabinet 24 on the right side.

An intermediate tray 2 is provided inside a cabinet 24 in which a copying machine main body 21 is placed. A paper transport path 39 is provided between the intermediate tray 2, the transport path 36, and the paper reversing unit 38. A conveyance roller l with a heater is provided on the left side of the paper conveyance path 39.

As shown in FIG. 1(B), the heater-equipped conveyance rollers 1 are upper rollers la each equipped with a heater 49,50 inside.
, and a lower roller 1b. Furthermore, the paper conveyed into the paper conveyance path 36 on the left side and the paper conveyed to the paper reversing unit 38 disposed at the lower left side are shown. This paper is a schematic representation smaller than the actual item. The heater of the conveyance roller facing the back side of the copy side (front side) of this paper is energized. Further, a paper feed roller 3 is provided at the paper feed section of the intermediate tray, and a paper and feed path 40 for conveying the absorbed paper to the copying process section is further provided at the upper left.

Inside the copying machine main body 21, the path from the paper feed section 30 to the paper discharge section 30 via the copy process section 26 is the main conveyance path, and from the paper discharge section 32 to the copy process section 26 via the intermediate tray 2. The route leading thereto is the sub-conveyance route.

FIG. 2 is a block diagram of the control section 111 of the automatic double-sided copying machine.

The control of the copying process is performed by the CPU 41, and the RO
M45 is the control! Write the program 1° in advance. R.A.
M46 is used as a working area for the program, and stores operation modes (duplex rendering mode, composite copying mode, etc.). The CPU 41 receives copy data from the operation panel 44 through panels li,:i, and section 43. and ■/
○ Human input is performed via the interface 42. This copy data includes the original size, paper size, i-choice code for double-sided copy mode and composite copy mode, and the number of copies. Duty data is output from the CPU 4i to the heater driver 48 and the solenoid driver 51 via the I10 interface 47. The heater driver 48 energizes the heater 49 or 50 based on the signal output from the I10 ink face 47 when multiple copying mode is selected, thereby raising the temperature of the heater. Heater 49.5
0 are respectively provided on the upper rollers la and lb of the conveyor roller with heater used in the embodiment of the present invention. Also, the solenoid driver 51 operates the solenoid based on the signal output from the I10 interface 47.
．． 53 to drive the flappers 35 and 37 shown in FIG.

FIGS. 3(A) and 3(B) are flowcharts showing the operation of the above-mentioned 3-sided copying method.

This automatic double-sided copying machine will be explained with reference to the same figure.

When the power is turned on, step ni (hereinafter step n
(i is simply referred to as ni), a warming amplifier is provided. Wait for the warming-up to finish at n2. Thereafter, when the ready lamp is turned on and the warming amplifier is completed, the key is read and the copy data is input (n3). At this time, it is determined whether the multiple copy mode has been selected (n4). If the multiple copy mode is not selected, when the print key is operated, paper is fed from the paper feed unit 30 and the copying process is performed (
1, -4H, -4nヮ). When the copy process is completed, it is determined in n8 whether the multiple copy mode is 'MtH', and if the multiple copy mode is not selected, that is, if it is the normal single-sided copy mode,
Turn off solenoid SQL 1, feed the paper in the paper ejection direction, and end the single-sided copying operation (n8-n, -n,.)
.

If the multiple copy mode is selected in n4, the ready lamp is turned off and skipped to nil, and it is determined whether the double-sided copy mode is selected.

When the double-sided copy mode is not selected, the heater in the lower roller 1b of the conveyor roller with heater shown in FIG. 1 is energized to heat the lower paper feed roller 1b (n, , -
+ Q, □). In this state, the ready lamp is off and it is like warming up! It's a voice. When warming up is complete, the ready lamp is turned on and the system waits for other key inputs. In addition, when the double-sided copy mode is not selected, that is, when the composite copy mode is selected, the heater in the upper roller 1a of the heater-equipped conveyance roller is energized to heat the upper roller 1a (nll" n 14)
. When this warming amplifier state is completed, the ready lamp is turned on and the device waits for other key inputs in the same way as above. When this print key is operated, the copying process is performed in the same way as the one-sided copying operation described above (ns→l'l 6
-4 il 7). Furthermore, it is determined again whether or not this copy mode is a multiple copy mode, and if it is a multiple copy mode, the process skips to n16 as shown in FIG. It is determined whether there is one (n16). When the duplex copying mode is selected, the solenoid SQL is turned on and the flapper 35 is swung in the direction of the arrow to guide the paper to the paper scraping path 36. Furthermore, the solenoid 5QL2 is turned off to guide the paper to the paper scraping path 36. The heater-equipped conveyance roller 1
(n+7'=n115). Since the lower roller 1b is heated when the double-sided copying mode is selected, the heated urine feed roller 1 heats the back side of the copying surface with the lower roller when the paper passes through the paper reversing section and is conveyed. By reducing the amount of water, the paper is stored in the intermediate tray 2 while correcting the curling of the paper that has occurred in the single-sided copying operation (021).

If the double-sided copy mode is not selected at n16, that is, if the composite copy mode is selected, the process proceeds to nlQ-n2G.

At nZ I + 02 Z, solenoid SQL 1 and SQL 2 are turned on in this order. As a result, the flapper 35 swings in the direction of arrow A and guides the paper that has passed the paper discharge roller 31 to the paper transport path 36. Furthermore, flapper 3
7 swings in the direction of arrow B, and guides the paper directly to the heated conveyance roller 1 without passing through the paper reversing section 38. Since the upper roller of the heater-equipped m feed roller 1 is heated when the composite copying mode is selected, when the paper is fed, the upper roller heats the back side of the copying surface and reduces the amount of moisture on the back side of the paper. As in the case of execution of the double-sided copying mode, the curl of the paper that has been subjected to the single-sided copying operation is corrected while being stored in the intermediate tray 2.

Next, when the print key is operated again during the second copy execution, paper is fed from the intermediate tray by the paper feed roller 3 and the second copy process is performed Cn2□
-nax-n 24). When the second copying process is executed, solenoid SQL 1 turns off and flapper 3
5 is returned to its original position and the paper is guided to a paper discharge roller in the sorter and discharged into each bin 33.

In the above operation, when the double-sided copy mode is selected among the multiple copy modes, the heater of the lower roller 1b of the heater-equipped feed roller that feeds the paper 1' to the intermediate tray is heated, so that the paper is When the paper is conveyed to this heater and double feed roller, the lower roller heats the back side of the copy surface. Furthermore, when the composite copying mode is selected, the paper reversing section 33, which is the reversing conveyance means, is disabled, and the heater of the upper roller 1a of the heater-equipped m feed roller 1 is heated, so that the paper does not pass through the paper reversing section 38. How many stages of heater feed roller 1 without passing through
is conveyed to the upper roller 1a? 2 Heat the back side of the photo surface.

In this way, by heating the back side of the paper after the single-sided copying operation, the amount of moisture on the back side is frozen, and the curl can be corrected by the phenomenon of moisture in the paper due to the fixation of the one-sided copying side. As a result, paper jams can be prevented when the paper is stored in the intermediate tray or when the second copy is executed using the paper.

(h) Effects of the Invention As described above, the automatic duplex copying machine of the present invention enables or disables the reversing conveyance means by the multiple copy mode selection means, and conveys the paper to the intermediate tray according to the selected mode. Since the heater of the inner roller of the pair of heater row feed rollers facing the back side of the paper is energized, even if the copy mode is the composite copy mode, the double-sided copy mode is set. Therefore, it is possible to correct the curl of the paper that occurred during the first copying side fixing of the paper.
It is possible to prevent troubles such as paper jams when storing paper in the intermediate tray or when performing the second copy, and
It also has the effect of preventing problems such as white spots, peeling nail stains, fixation wrinkles, and creases caused by curls.

[Brief explanation of drawings]

FIG. 1(A) is a schematic diagram of an automatic double-sided copying machine according to an embodiment of the present invention. FIG. 1 (,B) is a partial cross-sectional view showing the main part of the stomach. Figure 2 is a diagram of the control section of the automatic double-sided copying machine. FIGS. 3A and 3B are flowcharts showing the operation of the automatic double-sided copying machine. 1a - Upper roller of m feed roller with heater, lb - Lower heater row feed roller (jI"10 - Ra, 2 - Intermediate tray, 26 - Copying process section, 30 - Paper feeding section, 31 - Paper ejection roller , 32-sheet discharge section, 38-sheet reversal section (reversal conveyance means).

Claims (1)

[Claims] (1) Paper is ejected through the main conveyance path from the paper feed section through the copying process section to the paper ejection section, the reversing conveyance means that selectively reverses the paper conveyance direction, and the intermediate tray where the paper is temporarily stored. Automatic double-sided copying equipped with a sub-conveyance path leading from the copying section to the paper feed section, and a multiple copy mode selection means for selectively inputting whether to enable or disable the reversing conveyance means when the paper passes through the sub-conveyance path. In the machine, a pair of heater-equipped transport rollers are installed in the paper transport path that transports paper to the intermediate tray, and are each equipped with a heater that is selectively energized, and a multiple copy mode selection means enables the operation of the reversing transport means to be effective. automatic double-sided copying, comprising: heater selection means for energizing the heater of the inner lower roller of the heater-equipped conveying roller when the heater is turned on, and energizing the heater for the upper roller when the operation of the reversing conveyance means is disabled; Machine.