JPH05138965A - Perfecting press - Google Patents

Abstract

PURPOSE:To enable perfect front operation on the front side of a printer and to make the printer small-sized and inexpensive by also using a manual paper feed port as a discharge port of printing paper subjected to double-side printing processing. CONSTITUTION:A manual paper feed port 4 is also used as a discharge port of printing paper subjected to double-side printing processing. As a result, an exclusive paper delivery part separate from the manual paper feed port can be dispensed with and, since the delivery of printed paper is also performed from the manual paper feed port on the front side of a printer by providing the manual paper feed port to the front of the printer, operability is improved and the peripheral space of the printer can be effectively utilized. Further, a mechanism is simplified and the body of the printer can be miniaturized and decreased in cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided printer (double-sided printing device).

[0002]

2. Description of the Related Art Conventionally, most printers which are output terminals as computer peripherals are serial printers, and only print on one side of a printing paper. Normally, this type of printer has its own characteristic mechanism so that it can handle various types of paper.

FIG. 4 shows a schematic configuration of a typical printer configuration of this type. This example is a printer that can feed and print single sheets (sheets, cut sheets) of printing paper and feeding and printing of continuous paper such as form paper (fanfold paper). is there.

Reference numeral 30 denotes a printer outer casing, and 31 is a paper stacker for single-leaf printing paper. The single-leaf printing paper is stacked and set on the stacker, and the pickup roller 32 is rotated by a print start signal to load the stacked set paper on the stacker. One sheet is fed into the printer and the paper guide 3
While being guided by 3.34, the platen roller 35 and the first
The sheet is pinched by the pinch roller 36 and conveyed along the lower surface of the platen roller 35, and then is pinched by the platen roller 35 and the second pinch roller 37 and conveyed upward, so that the leading end of the sheet faces the print head 38. The paper is continuously fed to the position.

Then, the paper is intermittently fed by a predetermined pitch, and at a predetermined timing, the print head 38 is driven to reciprocate along the guide shaft 40 in a direction perpendicular to the paper surface, and the print head is driven. The target printing is sequentially performed by the.

The printed paper portion is discharged onto the paper discharge tray 42 outside the machine by the paper discharge roller 41, and the printed (single-sided print) paper is sequentially stacked on the tray 42. For feeding and printing the continuous printing paper, the continuous printing paper is fed to the platen roller 35 along the paper guide 34 by using the tractor unit 43 provided in the printer or optionally installed later. The same printing as that of the single-leaf printing paper is performed and the printing process is sequentially executed. The printed paper portion (single-sided printing) is normally discharged to another stacker outside the machine without using the tray 42.

On the other hand, although it has not been put to practical use, various studies have been made to enable double-sided printing in this type of printer.

For example, as shown in FIG. 5, a structure using two first and second print heads 38A and 38B for the first side (front side) printing and the second side (back side) printing of the printing paper is used. 6 and the like, which has a configuration in which front and back both sides printing is performed by one print head 38 as shown in FIG.

Referring to FIG. 5, the single-leaf printing paper stacked and set on the paper stacker 31 is fed by the pickup roller 32 into the printer for one sheet, and the fed paper is fed by the paper guide 34 and the pinch roller 36. The first surface of the first platen roller 35A is laid out by 37 so that the first surface is the outer side, and the first print head 38A receives the printing processing on the first surface.

Next, the second platen roller 35B is moved to, the second surface is wound around the second platen roller so that the second surface is the outer side, and the second print head 38B performs a printing process on the second surface. ..

The paper on which both the front and back sides have been printed is ejected onto a paper ejection tray 42 by a paper ejection roller 41. In the single-sided print mode, the second print head 38B does not operate.

Referring to FIG. 6, the single-leaf printing paper stacked and set on the paper stacker 31 is fed by the pickup roller 32 into the printer for one sheet, and the paper guide 34 and the pinch rollers 36 and 37 platen the rollers. The first surface side is wound around the periphery of 35 so that the print head 38 performs a printing process on the first surface.

In the single-sided printing mode, the printed sheet portion on the first side is guided to the sheet discharge roller 41 side by the lower guide surface of the movable guide 44 which is switched to the first switching posture shown by the solid line. The paper roller 41 discharges the paper to the paper discharge tray 42.

In the double-sided printing mode, the printed sheet portion for the first side is sent to the upper side of the platen roller 35 by the left side guide surface of the movable guide 44 which is switched to the second switching posture shown by the two-dot chain line. , The first-side printed sheet passes over the platen roller 35 and is printed on the second stacker (pseudo stacker) 45 arranged on the opposite side of the sheet discharge tray 42 with the platen roller 35 in the middle. One side is discharged as the outside.

Then, the first surface printed paper discharged to the second stacker 45 slides down on the surface of the second stacker 45 and platen roller 35 and first pinch roller 36.
When the platen roller 35 is rotated, it is drawn into the printer again as the platen roller 35 rotates, and the paper guide 34 and the pinch rollers 36 and 37 squeeze the platen roller 35 around the second surface so that the second surface is outside. The print processing on the second surface by the head 38 is performed. By this time, the movable guide 44 has been switched again to the first switching posture shown by the solid line, and the sheet on which double-sided printing has been performed is moved to the guide 4
The lower guide surface of the sheet 4 guides the sheet to the sheet discharge roller 41 side, and the sheet with double-sided printing is discharged onto the sheet discharge tray 42.

[0016]

By the way, at the present time when computers are remarkably developed and personal computers are rapidly spread, consumption of printing paper used for a printer which is an output terminal and consumption is also remarkable. It is increasing.

Therefore, from the viewpoint of resource saving and energy saving, it is desirable that the printing paper is used for front and back side double-sided printing to improve the paper usage efficiency.

The conventional printers have low printing performance and have various problems such as printing accuracy and printing strike-through, and it is difficult to use the same printing paper for the front and back sides. By improving the performance, these problems are solved and double-sided printing itself is sufficiently possible.
However, with regard to the printer, the printer that can print on both sides is more complicated than the printer that prints on only one side.
It is a win because it becomes larger and leads to an increase in initial cost, and it is also inferior in ease of paper handling and high speed.

For example, in the case of the printer capable of double-sided printing shown in FIG. 5, the most expensive and accurate output terminal is required.
Two print heads are used for printing by performing the control.
The need for 38A and 38B alone increases the initial cost and complicates the device configuration.

The print control method is also applied to each print head 38A.
Each command must be transmitted to the 38B, and the print buffer and the like are required to be doubled. In addition, the power capacity for driving these is doubled, and the sound and vibration generated while the device is operating become large, so that it is difficult to be adopted as a practical machine in total.

Further, in the case of the double-sided printable printer of FIG. 6 provided with the second stacker 45 for reversing and reintroducing the paper on which the first side is printed, a paper path for reversing and reintroducing the paper is provided. If the size of the device is increased to secure it and it is tried to put it together in a small printer, the space from the paper path switching mechanism after printing to the second stacker 45 cannot be taken long, and the top and bottom of the printing result are reversed. It was ejected, and when printing on the back side, the top and bottom had to be printed in reverse, which made it necessary to have a memory for one page and the print control was complicated.

In the case of miniaturization, the second stacker 4
It is necessary to reduce the size of the device by ejecting the paper paths up to 5 out of the machine, and ejecting the paper on which the first side is printed out of the machine is an unexpected trouble for the printer (environmental environment of the device, such as wind). And objects in the space above the device interfere with the paper path, etc.), which made it difficult to achieve miniaturization without realizing it.

Further, in the conventional printer, the required space including the paper feeding / discharging when actually used is considerably large in addition to the size of the device, and the paper path configuration makes one direction (only the front side of the printer). It was difficult to create the operability of). From the right side of the printer to the left side, from the front side to the rear side, and from the rear side to the rear side, it is difficult for the operator to operate only on the front side of the printer, which requires a certain space around the output terminal. In addition, the operator had to extend his hands to operate the terminal.

In view of the above, it is an object of the present invention to provide a double-sided printer, which is capable of full front operation on the front side of the printer, and which can be downsized and reduced in cost.

[0025]

SUMMARY OF THE INVENTION The present invention is a double-sided printer having the following configuration.

(1) A double-sided printer characterized in that it is used both as a manual sheet feed port and a discharge port for printing paper which has been subjected to double-sided printing.

(2) The double-sided sheet according to (1), characterized in that the feeding roller in the vicinity of the manual sheet feeding port is driven to rotate in the direction for pulling the printing sheet into the machine only when the sheet is fed in the manual feeding mode. Printer.

(3) The double-sided printer according to (2), characterized in that the feeding roller in the vicinity of the manual feeding port is stopped in the normal rotation after feeding the printing paper for a certain length. ..

(4) The feeding roller in the vicinity of the manual paper feed port is reversely driven to eject the print paper which has been subjected to double-sided printing from the manual paper feed port to the outside of the machine (2). ) Two-sided printer described.

(5) The double-sided printer according to (1), characterized in that the single-sided printed printing paper in the single-sided printing mode is discharged as the face-down output port with the manual feed port.

[0031]

[Advantages] By making the manual paper feed port and the paper ejection port for double-sided print processing double, it is possible to eliminate the need for a dedicated paper ejection section separate from the manual paper feed port. Also, by making the manual paper feed port on the front of the printer, the printed paper can also be ejected from this manual paper feed port to the front side of the printer. The paper handling makes the operability good, the space around the apparatus can be effectively used, the mechanism is simplified, and the printer main body can be downsized and the cost can be reduced.

[0032]

【Example】

 <Embodiment> (FIG. 1) FIG. 1 is a schematic configuration diagram of a printer according to a first embodiment.

Reference numeral 1 is a printer, and D is a base on which the printer is mounted. Reference numeral 2 is a printer front plate, 3 is a paper cassette insertion / removal opening opened at a lower portion of the printer front plate, and 4 is a paper manual insertion opening opened at an upper portion of the printer front plate.

Reference numeral 5 denotes a paper cassette in which single-leaf printing paper P is stacked and stored, which is inserted and mounted in the printer main body through the insertion / removal opening 3 and is pulled out and taken out (front loading type). A pickup roller 6 feeds one sheet from the sheet cassette 5.

Reference numeral 7 denotes a manual feed tray provided at the manual paper feed port 4 so as to project outward. As will be described later, the manual paper feed port 4 and the manual paper feed tray 7 also serve as a discharge port and a discharge tray for double-side printed paper in the double-sided printing mode. Further, it also serves as a sheet discharge port and a discharge tray for the one-side printed sheet when face-down sheet discharge is selected in the one-side print mode.

Reference numeral 8 denotes a first sheet feeding roller which is arranged near the manual paper feed opening 4 and which is controlled to rotate in the forward and reverse directions. The second and third sheet feeding roller pairs, and 11 are the second and third sheet feeding roller pairs.
Platen plate disposed between the pair of paper feeding rollers 9 and 10.
A print head 12 is arranged above the platen plate 11 and is reciprocally driven along a guide shaft 13 in a direction perpendicular to the paper surface. The print head 12 may be of any type, such as a wire dot type, a thermal transfer type, or an inkjet type, as long as it forms an image with dots.

Reference numeral 14 is a movable guide for switching the paper path, which is arranged next to the second paper feed roller pair 10, 15 is a paper reversing roller, and 17 is a paper discharge port opened to the rear side of the printer top plate. Reference numeral 16 denotes a discharge paper path that leads from the second pair of paper feed rollers 10 to the paper discharge port 17, reference numeral 18 denotes a paper discharge roller provided at the paper discharge port 17, and reference numeral 19 projects outward from the paper discharge port 17. This is a face-up paper ejection tray provided in the single-sided printing mode.

Reference numeral 20 denotes a reversing paper path which leads from the second paper feeding roller pair 10 to the reversing roller 15, and 21 denotes the reversing roller 1.
5 is a pinch roller abutting on 5, 5 is a return paper path for returning the U-turned paper to the second paper feeding roller pair 10 about halfway around the reversing roller 15, and 23 is provided in the middle of this return paper path. And a fourth feeding roller pair. (A) Single-sided printing mode a) When feeding from a paper cassette.

A single-sided / double-sided print changeover switch (not shown) provided in the printer is set to the single-sided print mode, or the single-sided print mode is designated by a soft command, or sent from the host device side such as a computer word processor. The control system of the printer enters a single-sided printing execution sequence in response to the incoming single-sided printing mode command signal.

Further, whether the paper discharge mode is a face-up mode for outputting a print result quickly or a face-down mode for outputting while aligning pages is selected and designated by a control means (not shown) in the control system, or the host is selected. The mode designation signal is input to the control system from the device side.

When a print start command is sent to the control system, the pickup roller 6 on the side of the paper cassette 5 is driven and one paper P in the cassette 5 is fed out and guided by the U-turn guide member 24 to the second position. Is fed to the nip portion of the feeding roller pair 9.

The second and third feeding roller pairs 9 and 10 feed the sheet from the second feeding roller pair 9 to the third feeding roller pair 10.
It is driven in the forward direction in the conveying direction.

Paper cassette 5 to pickup roller 6
The sheet P sent out by is fed to the print position by the second and third feeding roller pairs 9 and 10 driven in the normal direction. At this time, after the cue is performed by the pair of rollers 9 and 10, intermittent feed is performed by a predetermined amount, and the print head 12 is reciprocated and driven to print the target image information on the first surface of the paper. The processing is sequentially executed.

In order to prevent the sheet from being bent on the platen 11, a drive transmission mechanism (not shown) allows the second and third feeding roller pairs 9 and 10 to feed several percent of the third feeding roller at the peripheral speed. The feeding roller pair 10 is set to exceed the number.

.. In face-up paper ejection mode.

When the face-up paper discharge mode is designated, the movable guide 14 is switched and held in the first switching posture indicated by the chain double-dashed line, and the discharging paper path 16 is opened by this posture, and the reversing paper is reversed. Pass 20 is closed.

Therefore, the portion of the sheet on which the first surface has been printed which has passed through the third pair of feeding rollers 10 passes through the upper surface side of the movable guide 14 in the first switching posture and enters the discharge sheet path 16.
The first side that has been subjected to the printing is output upward from the sheet discharge roller 18 to the face-up sheet discharge tray 19 from the sheet discharge port 17.

.. In face-down paper ejection mode.

When the face-down sheet discharge mode is designated, the movable guide 14 is switched and held in the second switching posture shown by the solid line, and this posture causes the discharging path 1 to pass.
6 is closed and the reversal paper path 20 is open.

Therefore, the portion of the paper on which the first surface has been printed which has passed through the third pair of feeding rollers 10 passes through the lower surface of the movable guide 14 in the second switching posture to enter the reversal paper path 20 and is reversed. U-turn is carried around the roller 15 about half way,
The paper is passed through the return paper path 22 and turned upside down and conveyed back to the third feeding roller pair 10.

Reference numeral S1 denotes a first paper sensor disposed at a position near the third feed roller pair 10 on the return paper path 22, and goes toward the third feed roller pair 10 through the return paper path 22. Detects the leading edge of inverted paper. The detection signal is input to the control system.

The control system uses the third input signal based on the input signal.
The second feeding roller pair 10.9 is switched to the reverse drive. As a result, the reversal return sheets from the return sheet path 22 to the third feeding roller pair 10 are respectively driven in the reverse rotation to the third feeding roller pair 1.
0: The printing unit is fed backward by the second feeding roller pair 9.
At this time, the print head 12 is inoperative. When the second paper sensor S2 detects the leading edge of the printed portion of the first surface which has exited the second feeding roller 9, the signal is input to the control circuit and the first signal is output based on the signal. The feeding roller 8 is reversely driven after a certain time or a certain pulse, and the sheet is fed from the sheet manual feed port 4 onto the manual feed tray 7, and this manual feed tray is used as a face-down discharge tray, with the first side on which printing has been performed facing downward. Is output.

When the second paper sensor S2 detects the passage of the second feeding roller pair 9 at the rear end of the sheet to be discharged face down on the manual feed tray 7, the detection signal is sent to the control system. Based on the input detection signal, the control system receives the first feeding roller 8 and the first feeding roller 8 after a predetermined time or a predetermined pulse when the trailing edge of the sheet passes through the first feeding roller 8 and the discharge is completed. 2. The reverse drive of the third and third feeding roller pairs 9 and 10 is stopped, and in the case of continuous printing, the next sheet is fed from the sheet cassette 5 and the printing processing sequence starts.

As described above, by ejecting the one-side printed sheet face down, the page alignment is automatically performed, and the sheet file after outputting a large number of sheets is easy and very convenient. b) In the case of manual feeding.

When a sheet is placed on the manual feed tray 7 and inserted into the printer from the manual feed port 4 until the leading edge of the sheet hits the contact nip portion between the first feeding roller 8 and the tray 7, the sheet is inserted first. 3 is detected by the paper sensor S3, and the detection signal is input to the control system, and it is determined that there is a manually fed sheet.

Then, when the print start command is sent to the control system, the first feeding roller 8 and the second and third feeding roller pairs 9 and 10 are driven to rotate in the normal direction, so that the sheet is manually fed into the printer. Will be delivered. The print processing operation for the manually fed sheet is the same as that for the automatically fed sheet from the sheet cassette 5 in the above a).

In the present embodiment, the first feeding roller 8 is driven to rotate in the normal direction by a predetermined constant pulse to feed the print paper for a certain length, and then the rotation is stopped or the rotation is controlled to be free. The paper is continuously fed or intermittently fed by the second and third feeding roller pairs 9 and 10.

In the face-up paper discharge mode.

As in the case of a)-, the first-side printed manual sheet that has passed the third feeding roller pair 10 is the first sheet.
The movable guide 14 which is switched and held in the switching posture is guided to the discharge path 16 side, and the printed first surface is output upward on the face-up discharge tray 19.

In the face-down paper discharge mode.

As in the case of a)-, the manually fed paper on which the first surface has been printed that has passed through the third feeding roller pair 10 is reversed by the movable guide 14 which is held in the second switching posture. The guide tray 20 is guided to the reversing roller 15 → returning paper path 22 → reversely driven third and second feeding roller pairs 10 and 9 and the first feeding roller 8 → the manual feeding tray in the path of the manual feeding port 4. The first side, which has been printed, is output downward on the sheet 7 by using this manual feed tray as a face-down discharge tray.

When the control system judges completion of the discharge of the sheet based on the sheet trailing edge passage detection signal of the second or third sheet sensor S2, S3, the reverse rotation drive of the feeding rollers 8, 9, 10 is performed. The printer is stopped, and the printer is in a standby state until the third paper sensor S3 detects that the next sheet is manually inserted.

(B) Double-sided printing mode a) In case of paper feeding from a paper cassette.

The control system of the printer enters the double-sided printing execution sequence by designating the double-sided printing mode by the mode changeover switch or the soft command, or by the double-sided printing mode command signal from the host device side.

The movable guide 14 is switched and held in the second switching posture shown by the solid line.

By sending a print start command to the control system, the paper P is fed from the paper cassette 5 and the printing process for the first side of the fed paper is executed as in the case of (A) -a). To be done.

As in the case of the first side, the printed sheet portion on the first surface exiting the third pair of feeding rollers 10 enters the reversing sheet path 20 by the movable guide 14 held in the second switching posture. Then, the sheet is turned upside down through the path from the reversing roller 15 to the return paper path 22 and is returned and conveyed to the third feeding roller pair 10.

The reverse rotation of the third and second feeding roller pairs 10 and 9 is performed based on the leading edge detection signal of the front and back reversed sheet conveyed by the first paper sensor S1, and the front and back reversed sheet is conveyed to the third side. The sheet is fed backward from the pair of feeding rollers 10 to the second pair of feeding rollers 9 and fed to the printing position. At this time, the rollers 10 and 9 perform the indexing, and then a predetermined amount of intermittent feeding is performed, and the print head 12 is reciprocated and driven to sequentially print the target image information on the second surface of the paper. It will be executed.

In order to prevent the sheet from bending on the platen 11, the driving mechanism (not shown) causes the third and second feeding roller pairs 10. The roller pair 9 is designed to exceed the roller pair.

When printing on the second side of the front and back reverse feed paper, the dot lines are replaced with each other so that output is performed upside down on the print head 12. In the case of a dot matrix printer that prints by dots, the output of print commands can be sent upside down, and a memory or the like is not required.

When the second paper sensor S2 detects the leading edge of the printed portion of the second side which has exited the second feeding roller pair 9, the signal is input to the control system and based on the signal. The first feeding roller pair 8 is reversely driven after a fixed time or a fixed pulse, and the second-side printed sheet is placed on the manual feed tray 4 onto the manual feed tray 7, and this manual feed tray is used as a face-down discharge tray. The output is face down.

When the second paper sensor S2 detects the passage of the position of the second feeding roller pair 9 at the rear end of the front and back double-sided printed sheets discharged to the manual feed tray 7, the detection signal is controlled. Based on the input detection signal, the control system inputs the first feeding roller 8 after a predetermined time or a predetermined pulse after the trailing edge of the sheet passes through the first feeding roller 8 and the discharge is completed. Then, the reverse driving of the second and third feeding roller pairs 9 and 10 is stopped, and then, in the case of continuous printing, the feeding and printing processing sequence of the next paper from the paper cassette 5 is started.

As described above, the manual paper feed port 4 and the manual paper feed tray 7 are also used as the paper discharge port and the discharge tray to discharge the front and back side double-sided printed paper facedown (first surface side downward discharge). Alignment is done automatically, making it easy and convenient to output paper files after printing a large number of sheets.

B) In the case of manual sheet feeding As in the case of (A) -b), when the sheet is inserted into the printer from the manual feed port 4, the insertion of the sheet is detected by the third paper sensor S3. When the print start command is sent to the control system, the manual feed paper is drawn into the printer by the forward rotation drive of the first feeding roller 8 and fed, and the printing process on the first side of the paper is executed.

Then, as in the case of (B) -b), the printed sheet portion on the first side that has left the third feeding roller pair 10 is the second
The movable guide 14 which is switched and held in the switching posture moves into the reversing paper path 20, is reversed upside down in the path from the reversing roller 15 to the returning paper path 22, and is conveyed back to the third feeding roller pair 10. The reversely driven third and second feeding roller pairs 9 and 10 convey the print position in reverse to perform the printing process on the second surface, and the reversely driven first feeding roller 8 → passage path 4 path Then, the front and back double-sided printed sheets are output downward on the first side on the manual feed tray 7.

When the control system determines that the paper has been discharged based on the paper trailing edge passage signal of the second or third paper sensor S2, S3, the reverse rotation drive of the respective feeding rollers 8, 9, 10 is stopped. The printer then waits until the third paper sensor S3 detects that the next sheet has been manually inserted.

The printer of this embodiment can be operated for double-sided printing on the front side of the printer, and can be downsized as a whole.
This is a configuration that enables cost reduction and the like.

<Embodiment 2> (FIG. 2) As for the output of the single-sided printing paper, if the printer only needs to perform the page-down output of the face-down paper discharge, the face-up paper discharge system mechanism is not required. As shown in FIG.
Since the movable guide 14 for paper path switching, the paper discharge path 16, the paper discharge port 17, the paper discharge roller 18, the face-up paper discharge tray 19 and the drive mechanism associated therewith are not required from the printer of FIG. Can be made smaller and simpler.

Further, since the upper surface of the printer is not used,
Other devices can be installed, the space around the printer can be effectively used, and the initial cost can be reduced.

<Embodiment 3> (FIG. 3) As shown in FIG. 3, the second feeding roller pair 9 is also used as a paper pulling roller at the time of manual feeding in FIG. 1 and the first feeding roller 8 is omitted. It is also possible to have various printer configurations.
In this case, the third paper sensor S3 is unnecessary, and the second paper sensor S2 may also be used.

With such a printer configuration, the apparatus can be made smaller and simpler than the printer shown in FIGS. 1 and 2.

In Examples 1 to 3, when the printing method is the ink jet method, the feeding roller on the printing surface side after printing may be separated from the printing surface to protect the printing surface. In this case, The first side printed sheet may be brought into contact with the second side of the sheet when printing is performed on the second side of the sheet after the sheet is reversed and fed back (backward).

[0083]

As described above, in the double-sided printer, the manual paper feed port is also used as the ejection port for the printing paper on which the double-sided printing has been performed, so that a dedicated paper different from the manual paper feed port is provided. It is possible to eliminate the need for the paper ejection section, and by making the manual paper feed port on the front of the printer, the printed paper can also be ejected from this manual paper feed port to the front side of the printer. The paper can be handled only on the front side of the printer which is the easiest to operate, the operability is improved, the space around the apparatus can be effectively used, the mechanism is simplified, and the size of the printer main body can be reduced and the cost can be reduced.

Therefore, it is possible to construct a practical printer capable of performing double-sided printing, and by using such a double-sided printing printer, printing paper can be used for front and back double-sided printing as much as possible to improve the efficiency of use of the paper and save resources. It is possible to meet the demand for energy saving.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a printer according to a first embodiment.

FIG. 2 is a schematic configuration diagram of a printer according to a second embodiment.

FIG. 3 is a schematic configuration diagram of a printer according to a third embodiment.

FIG. 4 is a schematic configuration diagram of an example of a conventional printer.

FIG. 5: Configuration example of printer capable of double-sided printing (No. 1)

FIG. 6 is a configuration example (2) of a printer capable of double-sided printing.

[Explanation of symbols]

 1 General code of the printer 2 Front plate of the printer 3 Paper cassette insertion / removal port 4 Paper manual insertion port 5 Paper cassette 6 Pickup roller 7 Manual paper feeding tray 8 First feeding roller 9 Second feeding roller pair 10 Third feeding Roller pair 11 Platen plate 12 Print head 13 Print head guide shaft 14 Movable guide 15 Reversing roller 16 Discharging paper path 17 Discharging port 18 Discharging roller 19 Face-up discharging tray 20 Reversing paper path 21 Pinch roller 22 Returning paper path

Claims (5)

[Claims] 1. A double-sided printer, wherein the double-sided printer is used as both a manual paper feed port and a discharge port for printing paper that has undergone double-sided printing. 2. The double-sided printer according to claim 1, wherein the feeding roller in the vicinity of the manual feeding port is driven to rotate in the direction for pulling the printing paper into the machine only when feeding in the manual feeding mode. .. 3. The double-sided printer according to claim 2, wherein the feeding roller in the vicinity of the manual paper feeding port is stopped in the normal rotation drive after feeding the printing paper for a certain length. 4. The feeding roller in the vicinity of the manual paper feed port is reversely driven to eject the print paper which has been subjected to double-sided printing from the manual paper feed port to the outside of the machine. Double-sided printer as described. 5. The double-sided printer according to claim 1, wherein the single-sided printing-completed printing paper in the single-sided printing mode is discharged by using the manual paper feeding port as a face-down output port.