JPH0720774B2 - Printer automatic paper feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an automatic paper feeder for a printer that feeds printing paper sheet by sheet.

(Prior Art) As a conventional paper feeding device of this type, a printing paper in a stacked state is pushed up by a spring to be sent out and brought into contact with a roller,
By rotating the feed roller, the print sheets are fed one by one, and when the print sheet reaches the feed roller provided on the downstream side of the feed roller, the feed roller continuously feeds the print sheet. There was one configured.

(Problems to be Solved by the Invention) However, in this conventional paper feeding device, even after the print sheet is fed by the feed roller subsequent to the feed roller, the feed roller causes the print sheet to be fed. Is in contact with the sheet and becomes a load of feeding by the feeding roller. In order to solve this, a structure has been proposed in which the feeding roller is separated from the printing paper, but there is a problem that the structure becomes very complicated.

Configuration of the Invention (Means for Solving Problems) In order to solve the above-mentioned problems, the present invention provides a stock unit for stocking printing paper in a stacked state and a top printing paper on the stock unit. A delivery roller arranged so as to face the upper surface, a drive motor for rotationally driving the delivery roller, a print sheet on the stock portion, and a print motor located opposite to the delivery roller. When the pressing member for pressing the feeding roller against the feeding roller and the drive motor rotate in the forward direction, the feeding roller is rotated in the feeding direction of the print sheet, and the pressing member is pushed against the feeding roller to drive the driving roller. When the motor rotates in the reverse direction, a pressing and separating means for separating the pressing member from the feeding roller and a downstream side of the feeding roller in the sheet feeding direction are provided. When the drive motor is normally rotated, the leading edge of the printing paper fed is stopped, and when the driving motor is rotated in the reverse direction to separate the pressing member from the feeding roller, the printing paper is fed. A feed roller that rotates in the feed direction and the drive motor are driven to feed the print sheet from the stock section until the leading end of the print sheet reaches the feed roller, and then,
The drive motor is driven in the reverse direction to separate the pressing member from the delivery roller, and the delivery roller is rotated in the delivery direction of the printing paper to feed the printing paper. .

(Operation) Therefore, in the automatic paper feeder of the printer of the present invention, when the drive motor is rotated in the forward direction, the feeding roller rotates in the feeding direction of the printing paper and the pressing member is pressed against the feeding roller. The printing paper is sent from the stock section. Then, the leading end of the fed printing paper stops at the position where it abuts the feeding roller. afterwards,
When the drive motor is driven in the reverse direction, the pressing member separates from the feeding roller, and the feeding roller rotates in the feeding direction of the printing paper to feed the printing paper to the printing unit side. Therefore, since the pressing member can be pressed against and separated from the delivery roller by utilizing the rotation of the drive motor, and the rotation of the delivery roller can be controlled, the structure is extremely simple and the printing paper is It can be delivered accurately.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

In the printer of this embodiment, as shown in FIGS. 1 and 2, the platen 2 is rotatably supported in the printer frame by the platen shafts 2a protruding at both ends thereof, and the printing paper PS is circulated around the outer periphery thereof. It can be supported. An inlet 2b for the print paper PS is provided on the upper surface of the printer frame behind the platen 2, and an outlet 2c for the print paper is provided on the upper surface of the printer frame above the platen 2. A guide shaft 3 is provided in the printer frame so that it extends parallel to the platen 2 in front of the platen 2.
And the guide rail 4 is erected and supported. A carriage 5 is supported on the guide shaft 3 and the guide rail 4 so as to be capable of reciprocating left and right, and a print head 6 is placed on the upper portion thereof. Then, while the carriage 5 is reciprocally moved along the platen 2, the platen 2 is moved by the print head 6.
Printing is performed on the upper printing paper PS.

A paper feed motor 7, which is a pulse motor as a drive motor, is mounted in the printer frame at the right end of the platen 2 via a mounting plate 8, and a gear 9 is fixed on the motor shaft of the platen 2. It meshes with the gear 10 at the right end of the shaft 2a. Each time the print head 6 prints one print line of the print paper PS, the paper feed motor 7 is rotated, and the platen 2 is moved counterclockwise in FIG. 1 via the gears 9 and 10. The paper is fed by being rotated by a fixed amount.

As shown in FIGS. 1 and 2, a paper feeding device is detachably mounted on the upper surface of the print frame above the platen 2. A plurality of pull-out rollers 11 are rotatably supported via roller shafts 12 between both side plates 1a and 1b of the frame 1 of the sheet feeding device, corresponding to above the print sheet discharge port 2c of the printer frame. By rotating the pull-out roller 11 counterclockwise in FIG. 1, the printing paper PS printed on the platen 2 is fed out from the pull-out port 13 on the frame 1. . A paper loading portion 14 formed by bending a metal wire is provided on the frame 1 in the vicinity of the drawer opening 13, and the printed printing paper PS sent from the drawer opening 13 is placed on the paper carrying portion 14. It can be placed.

A plurality of driving and driven feed rollers 15 and 16 are in contact with each other between both side plates 1a and 1b of the frame 1 corresponding to above the printing paper inlet 2b of the printer frame via roller shafts 17 and 18, respectively. Rotatingly supported, drive feed roller 15
1 is rotated counterclockwise in FIG. 1 so that the printing paper PS supplied to the upper part between the feeding rollers 15 and 16 is fed.
Are sent to the outer periphery of the platen 2. Frame 1 above the rear of the feed rollers 15 and 16
A stock section 19 for stocking the printing paper PS in a laminated state is provided on the upper side, and as will be described later, this stock section 19 is provided.
19 Printing paper PS from above one by one, the feed rollers 15 and 16
It is designed to be fed to the upper part of the space.

A sheet insertion port 20 is formed on the frame 1 above the feeding rollers 15 and 16, and one printing sheet PS can be manually inserted from the sheet insertion port 20 to the upper part between the feeding rollers 15 and 16. It has become. A paper guide plate 21 made of a conductive metal plate is disposed in the frame 1 between the lower part of the paper insertion port 20 and the stock portion 19, and is grounded through an appropriate electric conductor. The statically charged printing paper PS fed between the feeding rollers 15 and 16 from the stock portion 19 or the paper insertion port 20 comes into contact with the paper guide plate 21 so as to be discharged. A sheet passage is defined by the sheet guide plate 21, a first sheet passage 55 on the stock portion 19 side and a second sheet passage 56 on the sheet insertion port 20 side.
It has become.

Next, the construction of the stock section 19 and the device for feeding the printing paper from the stock section 19 will be described in detail. As shown in FIGS. 1 to 3, both side plates 1a, 1a of the frame 1 corresponding to the stock section 19 will be described. A roller shaft 22 is rotatably supported between 1b. On the roller shaft 22, a pair of left and right feeding rollers 23 are fitted and supported via a sleeve 24 so as to be integrally rotatable and relatively movable in the left and right directions, and the upper surface of the uppermost printing paper PS on the stock portion 19 is supported. It is facing so that it can touch.

A recess 25 extending in the left-right direction is formed on the frame 1 below the rear portion of the roller shaft 22. In the recess 25, a pair of left and right paper support plates that constitute the stock portion 19 are provided.
The papers 26 are movably supported in the left-right direction, and have paper-sheet-carrying surfaces 26a formed on their upper surfaces and paper-width-regulating surfaces 26b at their side edges. As shown in FIGS. 1, 3, and 4, a through hole 27 and a substantially U-shaped engaging portion 28 are formed in the sheet width regulating surface 26b of both sheet supporting plates 26, and the engaging portion 28 is used for each feeding roller. It is engaged with the sleeve 24 of the 23 between the pair of flange portions, so that both paper support plates 26 can be fed out in accordance with the width of the print paper PS and moved in the left-right direction integrally with the roller 23. There is.

Roller for feeding the printing paper PS on the stock section 19 by sandwiching it
A pressing member 29 is provided on both paper supporting plates 26 so as to be located on the opposite side to the through holes 2 at the engaging protrusions 29a at the four corners thereof.
It is supported movably up and down in a state of being engaged with both sides of the opening edge of 7 and the edge of the lower wall portion 26c.
Is projected. An operating shaft 30 is vertically movably arranged between the both side plates 1a and 1b of the frame 1 so as to pass through the leg pieces 29b of both pressing members 29. Then, when the operating shaft 30 is moved upward, the two pressing members 29 are fed by the feed rollers.
The print sheet PS is moved toward 23 and pressed against the delivery roller 23, and in that state, the delivery roller 23 is rotated counterclockwise in FIG. Both feed rollers 1 through one paper passage 55
It is designed to be fed to the upper part between 5,16.

As shown in FIGS. 2, 5 and 6, a transmission mechanism 31 is provided between the paper feed motor 7 and the delivery roller 23, and the rotation of the paper feed motor 7 is transmitted through the transmission mechanism 31 to the delivery roller 23. To be transmitted to. Therefore, the transmission mechanism 31 will be described in detail. Gears 32, 33, and 34 are fitted to the left end portions of the platen shaft 2a of the platen 2, the roller shaft 12 of the pull-out roller 11, and the roller shaft 17 of the drive feeding roller 15, respectively. Fixed together, teeth 3
Intermediate gears 35, 36 are rotatably supported on the left side plate 1a of the frame 1 between the gears 2, 33 and the teeth 33, 34. Then, the platen 2 is rotated by rotating the paper feed motor 7 in one direction.
1 is rotated in the direction opposite to the paper feed indicated by the arrow P in FIGS. 1 and 5, the pull-out roller 11 and the drive feed roller 15 are rotated in the clockwise direction in FIG. When the platen 2 is rotated in the paper feeding direction indicated by the arrow Q in FIGS. 1 and 5 by the other rotation of the feeding motor 7, the pull-out roller 11 and the drive feeding roller 15 are rotated counterclockwise in FIG. It has become so.

As shown in FIGS. 2 and 6, a gear 37 is fitted and fixed to the right end of the roller shaft 17 of the drive feed roller 15, and a gear 38 is attached to the right end of the roller shaft 22 of the feed roller 23. Fitted and supported so as to be relatively rotatable. A pair of intermediate gears 39, 40 integrally formed on the right side plate 1b of the frame 1 between the gears 37, 38 are rotatably supported via a support shaft 41, and one intermediate gear 39 is attached to the gear 37. It is meshed. The support shaft
A switching lever 42 is rotatably supported on 41, and an intermediate gear 43 meshing with the gears 38, 40 is rotatably supported on the outer surface thereof.

As shown in FIGS. 2 and 7, the roller shaft 2 of the delivery roller 23 is
Rotating bodies 44 are fitted and fixed to the left and right ends of 2, respectively.
A pinion 45 is formed almost at the center. A spring clutch 46 is interposed between the gear 38 on the roller shaft 22 and the right rotating body 44, and the rotation of the gear 38 is always kept on the right rotating body 44.
To rotate the roller shaft 22 and the delivery roller 23. Both pinions 4 as shown in Figures 2, 5 and 6
On the peripheral side of 5 is a rack portion 47a that meshes with those pinion 45.
Rack bodies 47 each having the above are disposed, and the operating shaft 30 of the pressing member 29 is coupled and fixed at both ends to the lower portion thereof.

Further, in this embodiment, the pinion 45 and the rack body 47 constitute a rack and pinion mechanism 48 as a pressing and separating means, and the platen 2 is rotated in one direction to cause the platen 2 to move in the direction shown by arrows in FIGS. When it is rotated in the direction opposite to the paper feed indicated by P, the pinion 45 and the delivery roller 23 are rotated in the direction of the arrow in FIGS. With the rotation of 45, the rack body 47 is linearly moved upward, the pressing member 29 is pressed and moved toward the sending roller 23, and the platen 2 is rotated in the other direction to move the platen 2 to the positions shown in FIGS. When rotated in the paper feed direction indicated by the arrow Q, the pinion 45 and the delivery roller 23 are rotated in the opposite direction to the arrow in FIGS. 1, 5, 6 and the rack body is rotated with the rotation of the pinion 45.
47 is linearly moved downward, and the pressing member 29 is moved away from the feeding roller 23. Further, the printing paper PS is pushed against the feeding roller 23 by the pushing movement of the pushing member 29, and the printing paper PS and the feeding roller 23 are pushed.
When the contact pressure with the certain pressure exceeds a certain level, the spring clutch 46
Is released, the working connection between the gear 38 and the rotating body 44 is cut off, and the pressing operation of the pressing member 29 is stopped.

Further, in this embodiment, a disconnecting mechanism for connecting / disconnecting the power transmission to the delivery roller 23 by the switching lever 42 and the intermediate gear 43 on the switching lever 42.
49 are configured. A tension spring is provided between the switching lever 42 and the right side plate 1b of the frame 1 as shown in FIG.
50 is provided to urge the switching lever 42 to rotate clockwise so that the intermediate gear 43 is always meshed with the gear 38 on the roller shaft 22 as shown by the solid line in FIGS. It is designed to be held in the connected state (automatic sheet feeding state).

An arcuate groove 51 is formed in the right side plate 1b of the frame 1, an enlarged portion 51a is provided at one end thereof, and a stop projection 51b is provided near the other end thereof. A pin 52 having a diametrical expansion head 52a is formed on the inner surface of the switching lever 42 so as to project, and the diametrical expansion head 52a is inserted into the groove 51 from the widening portion 51a. It is designed to be moved along 51. When the switching lever 42 is rotated forward against the action of the tension spring 50 as shown by the chain double-dashed line in FIGS. 6 and 8, the intermediate gear 43 disengages from the gear 38 on the roller shaft 22. The transmission mechanism 31 is cut off (manual paper feeding state), and in this state, the pin 52 rides over the locking projection 51b and is locked on the front side thereof so that the switching lever 42 is held at the rotating position. It has become.

As shown in FIG. 6, an operating piece 53 is formed on the lower rear portion of the switching lever 42 so as to project therefrom. A detection switch 54 as a detector is arranged on the right side plate 1b of the frame 1 so as to correspond to the operating piece 53, and is opened and closed through the operating piece 53 in accordance with the switching operation of the switching lever 42 to shut off. Mechanism 49
It outputs the detection signal according to the connection state and the shield state.

Next, in the printer configured as described above, the configuration of the control circuit for controlling the operation of the paper feed motor 7 will be described with reference to FIG. 10. In the central processing unit (CPU) 61 that constitutes the control means, , Read only memory (ROM) 62
And a random access memory (RAM) 63 is connected. The ROM 62 stores a program for controlling the entire printer, and the RAM 63 stores the number of supply pulses (paper number) for obtaining a predetermined rotation angle in the direction opposite to the paper feed of the paper feed motor 7 in the automatic paper feed switching state. A pulse motor is used as the feed motor 7), and the number of supply pulses for obtaining a predetermined rotation angle of the paper feed motor 7 in the paper feed direction in a switching state between automatic paper feed and manual paper feed is stored. There is.

Further, the CPU 61 is connected to a paper feed switch 64 for starting a paper feed operation provided on the frame 1 and the detection switch 54 via an input interface 65, and a start signal and detection from the paper feed switch 64 are performed. The detection signal from the switch 54 is input to the CPU 61. In addition, the CPU
The paper feed motor 7 is connected to 61 via the output interface 66 and the driver 67.
A drive or stop signal is output to.

Next, the operation of the printer configured as described above will be described. Now, in this printer, during the paper feeding operation for feeding the printing paper PS onto the platen 2, the program shown in the flowchart of FIG. 11 is disclosed under the control of the CPU 61. First, the CPU 61 feeds the paper at the Sup S1. Switch 64 O
When N is waited and the paper feed switch 64 is turned on, the program proceeds to the next step S2. In step S2, it is determined whether or not the detection switch 54 is turned on.
As shown by the solid lines in FIGS. 6 and 8, when the switching lever 42 is switched to the automatic paper feeding state and the detection switch 54 is turned on, the paper feed motor 7 is used to print the paper at the time of the next step S3. While being rotated in the direction opposite to the feed, it is determined in step S4 whether or not the predetermined number of rotations stored in the RAM 63 has been reached, and the step S3 is continuously scanned around step S4 until the predetermined number of rotations is completed. .

As described above, when the paper feed motor is rotated in the direction opposite to the paper feed at the time of printing and the platen 2 is rotated in the direction of arrow P in FIGS. 1 and 5, the rollers are transmitted via the transmission mechanism 31 in the connected state. The shaft 22 is rotated in the direction of the arrow in Figs. 5 and 6, and its roller shaft 22
The upper feed roller 23 is fed counterclockwise in FIG. 1 and rotated. Further, as the roller shaft 22 rotates, the pair of left and right rack bodies 47 are moved upward via the pinions 45 at both ends thereof,
The pressing member 29 is pressed and moved toward the delivery roller 23, and the printing paper PS is pressed against the delivery roller 23. Therefore, the topmost sheet of printing paper PS on the stock section 19
Is a pair of feed rollers 15, 16 via the first paper path 55.
It is delivered toward the upper part of the space. At this time, the drive feeding roller 15 is rotated in the direction opposite to the feeding direction as indicated by the arrow in FIG.
The PS does not pass between the feeding rollers 15 and 16, and the leading end of the printing paper PS is retained at the contact point between the rollers.

Further, at the time of feeding the printing paper PS, the pressing member
When the contact pressure between the printing paper PS and the feeding roller 23 becomes a certain value or more due to the pressing movement of 29, the spring clutch 46 shown in FIGS. 2 and 7 is released, and the operation between the gear 38 and the rotating body 44. The connection is broken, and the pressing operation of the pressing member 29 is stopped. Therefore, the printing paper PS is always pressed against the feeding roller 23 with a constant contact pressure regardless of the amount of the printing paper PS stacked on the stock portion 19, and one sheet is printed as the feeding roller 23 rotates. The printing paper PS of is surely sent out from the stock unit 19.

Then, the paper feed motor 7 is rotated by a predetermined number of steps in the direction opposite to the paper feed at the time of printing, so that the print paper PS is slightly spread on both feed rollers 15 and 16 as shown by the chain double-dashed line in FIG. When in a curved state, the program proceeds from step S4 to step S5 shown in FIG. 11 under the control of the CPU 61. In step S5, the paper feed motor 7 is rotated in the paper feed direction during printing, and in the next step S6, it is determined whether or not the predetermined number of steps stored in the RAM 63 has been reached, and the predetermined number of steps is reached. Until then, the scan from step S5 to step S4 is continued.

As described above, when the paper feed motor 7 is rotated in the paper feed direction at the time of printing and the platen 2 is rotated in the direction of arrow Q in FIGS. 1 and 5, the drive feed roller 15 is moved to the first position via the transmission mechanism 31. 1
Rotated counterclockwise in the figure, the printing paper PS passes between the two feeding rollers 15 and 16 and is fed onto the platen 2.
At this time, the delivery roller 23 is moved to the first position via the transmission mechanism 31.
Rotated clockwise in the figure, the pinion 45 on the roller shaft 22 rotates so as to move the rack body 47 downward due to the friction between the rotating body 44 and the gear 43 via the spring clutch 46. (The rotation in this direction does not act so that the spring clutch 46 positively rotates the pinion 45, but since there is almost no load, the above friction is sufficient to rotate the pinion 45.) By the movement, the pressing member 29 is moved in the direction away from the feeding roller 23, and the pushing roller 29 is moved.
Since the pressing operation of the printing paper PS against 23 is released,
The feeding of the printing paper PS is never hindered.

When the paper feed motor 7 is rotated in the paper feed direction at the time of printing by a predetermined number of steps, the print paper PS is arranged between the platen 2 and the print head 6 as shown by a broken line in FIG. The rotation of the paper feed motor 7 is stopped, and the paper feeding operation ends. The leading edge of the printing paper PS is the feed roller 15,1
Since it is already determined by 6, the print start position is maintained constant by the rotation of the motor 7 by the predetermined number of steps. After that, while the carriage 5 is reciprocally moved along the platen 2, printing is performed on the printing paper PS on the platen 2 by the print head 6, and when the printing operation of one print line is completed, the paper feed motor 7 is printing. When the platen 2 is rotated in the paper feeding direction, a predetermined amount of paper is fed by the rotation of the platen 2 in the direction of the arrow Q, and the end of the printing paper PS is sequentially drawn out from the drawing opening 13 by the rotation of the drawing roller 11. To be done.

On the other hand, step S2 in the flowchart shown in FIG.
When determining the above, if the switching lever 42 is arranged to be switched to the manual feeding state as shown by the chain double-dashed line in FIGS. 6 and 8 and the detection switch 54 is turned off, the program proceeds to steps S3 and S4. Skip to step S5. Therefore, when one sheet of printing paper is manually inserted for printing, the printing paper PS is fed from the paper insertion port 20 through the second paper passage 56 as shown by the alternate long and short dash line in FIG. roller
When the paper feed switch 64 is turned on after inserting it between the upper part of the paper 15, the paper feed motor 7 is rotated in the paper feed direction at the time of printing by a predetermined number of steps in steps S5 and S6, and the feed roller 15, The printing paper PS is fed onto the platen 2 with the rotation of 16.

Further, during the rapid feeding operation, the intermediate gear 43 on the switching lever 42 is disengaged from the gear 38 on the roller shaft 22 to transmit the transmission mechanism 31.
Is in a power transmission cutoff state, the rotation of the paper feed motor 7 is not transmitted to the roller shaft 22, and the feeding roller 23 and the pressing member 29 are stopped. Therefore, it is possible to smoothly insert the printing paper PS manually by hand without applying an extra load to the paper feeding motor 7.

The present invention is not limited to the configuration of the above-described embodiment, and the configuration can be arbitrarily changed to each part without departing from the spirit of the present invention.

As described above in detail, according to the present invention, the forward rotation of the drive motor causes the feeding roller to rotate in the feeding direction of the printing paper, and the pressing member pushes the feeding roller to feed it. The leading edge of the incoming printing paper stops at the position where it abuts the feed roller. On the other hand, due to the reverse direction of the drive motor, the pressing member separates from the feeding roller and
The feeding roller rotates in the feeding direction of the printing paper, and the printing paper is fed to the printing unit side. Therefore, since the pressing member can be pressed against and separated from the delivery roller by utilizing the rotation of the drive motor, and the rotation of the delivery roller can be controlled, the structure is extremely simple and the printing paper is It can be delivered accurately.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a printer embodying the present invention, FIG. 2 is a partial horizontal cross-sectional view of the printer mainly showing a rotation transmission structure of each roller, and FIG. 3 is a line AA of FIG. Partial sectional view, FIG. 4 is a partial sectional view taken along line BB in FIG. 3, FIG. 5 is a partial left side view of the printer, FIG. 6 is a partial right side view of the same, and FIG. 7 is a partial side view of FIG. FIG. 8 is a partial sectional view showing an enlarged structure of a spring clutch portion, FIG. 8 is a partial side sectional view showing an enlarged structure of a switching lever of a breaking mechanism, and FIG. 9 is a partial sectional view taken along line CC of FIG. FIG. 10 and FIG. 10 are control circuit diagrams for controlling the operation of the paper feed motor, and FIG. 11 is a flowchart showing the paper feeding operation. 7 ... Paper feed motor as drive motor, 15, 16 ... Feeding roller, 19 ... Stock section, 23 ... Feeding roller,
29 ... pressing member, 48 ... rack and pinion mechanism as pressing / separating means, 61 ... CPU constituting control means.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location B65H 3/06 350 C 8712-3F A 8712-3F

Claims (1)

[Claims] 1. A stock section (19) for stocking printing paper (PS) in a laminated state, and a top printing paper (P) on the stock section (19).
S), the delivery roller (2
3), a drive motor (7) for rotationally driving the delivery roller (23), and a position opposite to the delivery roller (23) with the printing paper (PS) on the stock section (19) being sandwiched between them. Then, the pressing member (2) that sends out the printing paper (PS) and presses it against the roller (23).
9) and when the drive motor (7) rotates forward, the feed roller (23) is rotated in the direction of feeding the printing paper (PS), and the pressing member (29) is pushed to the feed roller. A pressing and separating means (48) for separating the pressing member (29) from the delivery roller (23) when the drive motor (7) is pressed against (23) and rotates in the reverse direction; and the delivery roller (23). Is provided on the downstream side in the paper feeding direction of, and when the drive motor (7) is normally rotated,
The leading end of the printing paper (PS) sent in is stopped, and the drive motor (7) is rotated in the reverse direction to push the pressing member (29).
When the feeding roller (1) is separated from the feeding roller (23), the feeding roller (1) rotates in the feeding direction of the printing paper (PS).
5,16) and the drive motor (7) to drive the print paper (PS)
From the stock section (19) until its tip reaches the feed rollers (15, 16), and then the drive motor (7) is driven in the reverse direction to move the pressing member (29) to the above-mentioned state. A control means (61) for feeding the print paper (PS) by separating the feed roller (23) and rotating the feed roller (15, 16) in the feed direction of the print paper (PS). An automatic paper feeder for a printer characterized by the above.