JPS6031985A - Paper sheet feeding device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a paper sheet feeding device that is detachably attached to a business machine such as a printer or a writer and supplies paper sheets to the business machine.

[Technical background of the invention]

Printers, typewriters, etc. are constructed such that a pinch roller is circumferentially attached to a platen, and by rotating the platen in the normal direction, the platen is inserted between the digraten and the pinch roller to feed nine sheets of paper in a predetermined direction. This type of office machine is generally equipped with a paper feeder having a paper holding section, and the paper sheets stacked and held in the paper holding section are taken out one by one by a separation roller and placed between a platen and a pinch roller. We are trying to supply it to In this paper feeding method, for example, the platen rotates in the opposite direction, and in conjunction with this, the separation roller is rotated via a rotation lever to adjust the inner end position of the plurality of sheets stacked and held in the sheet holder. A method is used in which the paper is brought into pressure contact with the surface of the paper and rotated in the paper feeding direction. When the platen rotates in the forward direction, that is, in the printing direction, the separation roller separates from the sheet holding section.

Generally, when printing on a sheet of paper, new lines are printed one after another from the top to the bottom of the sheet, and therefore the platen rotates within a predetermined range when starting a line and repeats this process intermittently. In addition, as a mode of printing on a sheet of paper, for example, as shown in FIG. 1, printing may be performed separately in two rows on the left and right sides. In such a case, first print on the left side (section A in the figure) sequentially from top to bottom, then print on the right side (section B in the figure), then rotate the platen in the normal direction and print on the left side. After that, when the platen is rotated in the opposite direction and the sheet 1 is returned to its original printing start position, the rear portion of the sheet 1 is returned to the outside of the sheet feeding device. However, for example, when printing on the left side ends in the middle of sheet 1 and moves on to printing on the right side, sheet 1 cannot be returned to the outside of the sheet feeding device because the button inside the sheet feeding device remains at the rear of sheet 1. .

If the trailing edge of the sheet 1 is between the separating roller and the sheet holding section, it can be returned into the sheet holding section, but if the trailing end of the sheet 1 is under the force holding the sheet. In such cases, the paper sheet cannot be returned to the paper holder, and an attempt to forcefully return the paper sheet may cause a complicated jam phenomenon.

[Purpose of the invention]

An object of the present invention is to prevent the trailing edge of the sheet from being under the force of holding the sheet when the sheet is once sent in the printing direction and is then reversely fed and printed again, for example, when printing in two rows on the left and right sides separately. To provide a paper sheet feeding device that can guide paper sheets to the opposite side of a paper sheet holding portion of a separation roller even when paper sheets are held, thereby preventing a jam phenomenon and thereby improving reliability.
be.

[Summary of the invention]

The paper sheet feeding device according to the present invention is configured such that a pinch roller is placed in circumferential contact with the platen and the platen is rotated in the forward direction so that the paper sheet inserted between the pinch roller and the platen is fed in a predetermined direction. A main body of a feeding device is detachably attached to an office machine, and the main body of the feeding device is provided with a paper sheet holding unit that presses the surface of a plurality of sheets held in a stacked manner at the inner end position of the paper sheets. a separation roller that rotates in a predetermined direction and supplies the sheet at its most extreme position between the platen and the pinch roller; a roller shaft that supports the separation roller and rotates integrally with the separation roller; A transmission mechanism that has an idle angle in the rotational direction with the roller shaft and transmits the rotation of the platen to the roller shaft; A plunger mechanism that contacts the leaf, and a control that stops energizing the plunger mechanism a short time after the platen is switched from reverse rotation to forward rotation by energizing the plunger mechanism in response to a paper feed command signal. means, and a paper for guiding the paper to the side opposite to the paper holding portion of the separation p-ra when returning the paper with the trailing end of the paper being positioned under the paper holding portion after printing has started. This configuration includes a leaf guide plate.

Therefore, when printing six sheets of paper in two rows on the left and right sides, which are once sent in the printing direction, are sent backwards and printed again, even if the trailing edge of the sheet is under the force holding the sheet, it will not move on the sheet guide plate. Since the paper sheet can be guided to the side opposite to the paper holding part of the separation roller, the paper sheet can be prevented from shading, and the paper sheet that has been sent in the printing direction can be reversed and printed again. It is possible to operate functionally even in the case of , and the reliability can be significantly improved.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIGS. 2 to 11. Figure 2 shows office machines such as Zolinta typewriters 1
The paper sheet feeding device is shown with a 12-karat gold sheet feeding device attached to the top surface of the paper sheet. FIG. 3 is a longitudinal cross-sectional view showing the paper sheet supply device 12 in relation to the office machine 1 side, with one (front side) side plate omitted.

As shown in FIG. 3, the office machine 1 includes a platen 13, a pinch roller 14 a t 14 b surrounding the platen 13, a vapor disposed along the outer periphery of the platen 13, and an id 15 and ! It is equipped with a motor 16 etc. for Latin drive.

On the other hand, the paper sheet feeding device 12 is equipped with a removable mounting base 18 on the bottom of the feeding device main body 11. A platen gear 20 and! The platen pulley 21 is attached to the motor 16 side, and the motor 16 side 22 is configured to drive the platen gear 21 via a belt 23.

The mounting base 18 of the paper sheet feeding device 12 has legs 24 provided on the front left and right sides (only one side is shown). latin axis 19
It is mounted on the office machine 11 with one leg 24
A pair of upper and lower transmission gears 25 and 26 are provided, and the lower transmission gear 26 meshes with the platen gear 2o.

Further, at the lower part of one side plate of the supply device main body 17, a passive gear 21 and a tie-mounted pulley 2 as a drive pulley are provided.
8 is coaxially provided, and the passive gear 22 is connected to the transmission gear 2.
It meshes with 5. Further, a timing pulley 29 is provided at the front of the -1 side plate, and rotating levers 3 J a * 3 jF b are provided on the left and right side plates (only one side is shown) of the supply device main body 17, respectively. A roller shaft 3 is provided on both levers 3 J a * 32 b.
3 is rotatably supported at both ends. A pair of left and right separation rollers 34 and a timing pulley 35 as an operating rotating body are integrally attached to the roller shaft 33, respectively.

And these timing pulleys 28, 29 +35
A tine belt 36 is wrapped around the transmission gear 1.
! 5. i! Together with 6, a rotation transmission mechanism 31 is configured. In addition, 38g in the figure is "Jab".

J 9 a * J 9 b is rotating lever 32m, 32
It is a stone medium to limit the rotation range of b.

The timing pulley 29 is rotatably supported on a shaft 51 supported between left and right side plates.

A sheet receiving roller 52 is integrally attached to this shaft 51.

Further, a cassette loading groove 54 is provided on the inner surface of the left and right side plates (only one side is shown) of the feeding device main body 17, and a paper sheet holding cassette 55 as a sheet holding portion is mounted in this loading groove 54 with respect to the feeding device main body 17. It is loaded upwards at a slightly backward angle.

The sheet holding cassette 55 has a sheet placing plate 56 therein, and the sheet placing plate 56 is rotatably supported at its upper edge inside the cassette 55. Paper sheets 57 of a predetermined size are stacked and held on this sheet placement plate 56.

Further, the lower end of the paper sheet placement plate 56 is biased outward by a lower side biasing spring 58, but the maximum amount of rotation in the biasing direction is that of the uppermost position of the stacked and held paper sheets 57. It is configured to be limited by bringing the surface into contact with the strut horn 959JIC.

9- The rotating levers 32*, 32b and the sheet holding cassette 55 selectively move the separating roller 34 to the lower surface of the uppermost sheet 57 by the rotation of the rotating levers 32IL, 32b. Contact relationships are getting busy. and each rotating lever 32a.

32b is constantly biased by return springs 6oa and 6ob in a direction to separate the separation roller 34 from the surface of the sheet 57, and is held in contact with the stone/43B&esitbltc.

Further, in a position in front of the cassette loading groove 54, a stocker 63 is provided for receiving processed paper sheets 57 sent out from the office machine 1 side. The sheet receiving roller 52 has a reed at a lower position of the stocker 63, and a receiving pinch roller 64 is in contact with the circumference thereof.

In the figure, tts indicates a plunger mechanism, and this plunger mechanism U is composed of a granger 66 and a solenoid 61, and the gransha 66 is connected to the rotating lever 12a via a spring 68. That is, by energizing the solenoid 61 and moving the plunger in the direction shown by the arrow in the figure, the rotary levers 32a and 32b are rotated toward the sheet 57, and the separating roller 34 is moved to the uppermost sheet 57. It is configured so that it comes into contact with the The syranger mechanism 65 is energized by a control unit 69 (shown in FIG. 5) provided in the office machine 11.
The control of the silancia mechanism 65 by the zero-order pressure control section 691C will be described with reference to FIGS. 5 to 7. FIG. 5 is a diagram showing a control section 69 on the side of the office machine 11 that controls the sheet feeding device 12. First, a format signal (
F-8) is input and thereby CPU 7 o is RO
Control is started according to the program of M71. Then, a sheet feeder control signal is output to the one-shot multi 23 via the input/output port 12 in order to feed the paper.

The one-shot multi 73 outputs a signal to the magnet drive 14 for a preset time according to this signal,
The solenoid 67 of the plunger mechanism 65 is energized to move the plunger 66 in the direction of the arrow in FIG. 3, and the separation row 234 is brought into contact with the uppermost sheet 57 as shown in FIG. At the same time, the platen motor 16tlC is connected via the input/output cupboard door 2 and the platen drive 25.
A control signal is output to rotate the platen 13 in the reverse direction. Paper feeding will now start. To explain this in Figure 6, the CPU
7 o first checks whether there is an error. What is this error? If there is an error, the error lamp is lit and a BUSY signal is output.

If there is no error, the presence or absence of data in the data buffer of the RTJM 7F is checked. After confirming that data exists, the data is determined.

Then, after confirming that it is the paper feeding data, the above-mentioned control, that is, the sheet feeder control signal is output, and the solenoid 67 is energized for a predetermined time to move the platen 13 by a predetermined amount (Ail).
) Rotate in the opposite direction. Then, as the separating roller 34 rotates in the paper feeding direction, the upper end paper sheet 57 is fed between the platen 13 and the pinch roller 14b. Then the CPU
70 rotates the platen I3 forward by a predetermined amount (Bi-) via the platen drive 75 and the platen motor 16. As a result, the paper sheet 57 is fed to the printing start position.

Now, a display (T-0-F set) indicating that the printing start conditions have been met is displayed on the RUM 77, and printing is started. For example, when printing on the paper sheet 57 in two rows on the left and right, the paper sheet 57 must be reversely fed once after printing on the left side and returned to its original position (printing start position). That is, CPU y o is the input/output port 22,! The platen 13 is reversely rotated by a predetermined amount via the platen drive 75 and the platen motor 16.

At this time, the sheet feeder control signal is not outputted from the CPU 7o, and the solenoid 62 is not energized.

Therefore, the separation roller 34 does not come into contact with the paper sheet 51 and no paper feeding is performed. After the paper sheet 57 is reversely fed to a predetermined position, the CPU 70 rotates the platen 13 forward to start printing on the right side (13-). After the printing on the right side is completed, the sheet 57 is fed into the stocker 63.

The series of operations from paper feeding to feeding into the stocker 63 will be explained using the time chart shown in FIG. First, solenoid F67 is excited at time (To) and for a minute time ΔT
Reverse rotation of the platen 13 starts after a delay (at time T1). The reason why the delay of the minute time ΔT is provided is that even if the solenoid 67 is energized, the two separation rollers 34 do not always come into contact with the paper sheet 57 at the same time.
This is to rotate the platen 13 in the opposite direction after contacting the platen 13.

Then, at time (Tg), the platen 13 starts to rotate forward and feeds the sheet to a predetermined printing position. At this time, solenoid 67
remains excited for a short time (ΔT'). This is because, as shown in FIG. 4, when the paper sheet 51 is fed, the paper sheet 57 on the separation roller 34 side is bent.
52 paper leaves for this deflection! A force is applied between the latin 13 and the pinch roller 14b to smoothly feed the sheet 57. Therefore, if the separation platen 34 is detached at the same time as the 14-platen 13 rotates forward, the above-mentioned deflection effect cannot be obtained, and there is a possibility that the paper cannot be fed smoothly. Therefore, as described above, even if the platen 13 starts to rotate forward, the solenoid 62 is energized for a short time (Δ'r'), and the paper sheet 52 is pressed by the separation roller 34. After the paper sheet 57 is sent to a predetermined printing position, printing on the left side is started (between Ts and T4).

After the printing on the left side is completed, the platen 13 is rotated in the reverse direction to return the paper sheet 57 to the printing position. (Between Ta-T5).

At this time, the solenoid 67 is not excited. Then, print on the right side (between Ti and T6) and after printing is completed, the stocker 63
A sheet of paper 57 is fed into (between Ts and T1).

In Fig. 5, 28 is an interface, 79 is a carriage drive, 80 is a carriage motor, and 8 beams? N drive, 82 beams? motor, 83 is a hammer dryer,
Reference numeral 84 indicates a nominal magnet, and reference numeral 85 indicates a DP switch.

As shown in FIGS. 8 and 9, the timing pulley 35 is formed with a fan-shaped (for example, θ=120°) convex portion 86, and the roller shaft 33 is provided with a protruding locking portion 87. has been done. This is after paper feeding has finished! When the latin 13 starts rotating in the normal direction, the solenoid 67 is energized for a short time (ΔT') as described above, and the separation roller J4 is in contact with the sheet. Therefore, if the separation roller 34 rotates (in the counter-feeding direction) at the same time as the platen 13 starts to rotate forward, there is a risk that the fed paper sheet 52 will return. 86 and a locking portion 87 are provided to prevent the separation roller 34 from rotating until the protruding portion 86 comes into contact with the locking portion 81.

Next, the configuration of the portion that guides the paper sheet 57 during paper feeding or reverse feeding υ will be explained with reference to FIG. In the figure, 88 indicates an upper guide plate that guides the paper sheet 57 from the upper surface side of the paper sheet 57 between the platen 13 and the pinch roller 14b. The tip of this upper guide plate 88 is curved toward the sheet 57 side. On the side facing this upper guide plate 88 and the paper leaf 57,
A lower guide plate 89 is provided to guide the paper sheet 57 from the lower surface side. Further, a third guide plate 90 is provided between this lower guide plate 89 and the office machine 11.
A paper sheet storage section 91 is formed between the paper sheet storage section 9 and the paper sheet storage section 91 for storing the nine paper sheets 57 that are reversely fed. The lower guide plate 89 is provided such that its extension line is located above the tip of the upper guide plate 88. This makes the paper sheet storage section 91 wider so that the reversely fed paper sheets 57 will not return between the upper guide plate 88 and the lower guide plate 89 and will be surely stored in the paper sheet storage section 91. It is for this purpose.

In FIGS. 3 and 4, 92 is a receiving paper guide, 94 is a feeding paper guide, and 93 is a printed body.

Below the separation roller 34, the paper feeding paper 9- is placed at the side 94.
A sheet guide plate 95 is provided above as shown in FIG. The paper guide plate 95 has its lower end opposed to one end of the paper feeding paper id 94 upper 17 with a gap therebetween, and curves toward the opposite side from the paper holding cassette 55 of the separation roller 34 as it goes upward. It is set up and crowded. That is, when printing in two rows on the left and right on a sheet of paper 57, if printing on the left side is finished and printing on the right side is to be performed, the sheet of paper 57 must be reversed and returned to the printing start position on the right side. In that case, if the rear part of the sheet 57 is below the lower end of the lower guide plate 89, it can be returned to the sheet storage section 91 as described above, but for example, printing on the left side ends near the middle of the sheet 57. In this case, the trailing end of the sheet 52 is inside the sheet feeding device 12 and cannot be returned to the sheet storage section 9. Therefore, by providing the paper sheet guide plate 95, for example, when the printed paper sheet 57 on the left side ends near the middle and the rear end of the paper sheet 52 is inside the paper sheet feeding device 12,
This is separated using the rotational force of the separation roller 34.
It is configured to guide the paper sheet holding cassette 55 to the side opposite to No. 4. Note that if the rear end of the paper sheet 52 is between the separation p-ra 34 and the paper sheet holding cassette 55, the paper sheet holding cassette 1
8=The configuration is such that it is returned to the seat 55.

Next, the operation will be explained.

First, sheets 57 of a certain size are stacked on the sheet mounting plate 56 of the sheet holding cassette 55, and the cassette 55 is inserted into the cassette loading groove 54.

When a predetermined operation is performed to feed the paper sheet 57, the solenoid 67 is energized, the motor 16 on the office machine 11 is started, and the platen 13 is rotated in the reverse direction (counterclockwise rotation in FIG. 3). let and platen gear 20
The rotational force of the transmission gears 26 and 25 is sequentially transmitted to the passive gear 2.
7. Then, the mapping pulleys 35 and 29 are further rotated clockwise in the figure via the timing belt 36.

Then, as shown in FIG. 4, the separation roller 34 comes into pressure contact with the surface of the uppermost sheet 51, and 91 sheets of paper 52 are taken out by the rotation of the separation roller 34 and placed between the platen 13 and the pinch roller 14. will be supplied. In addition, Konoto 17
° Since the latin 13 rotates in the opposite direction, the sheet 57 fed upwards is not drawn between the platen 13 and the pinch roller 14, and the lower end of the sheet 57 is held between the platen 13 and the pinch roller 14. It is held in a fixed position where it abuts.

Here, the lower end of the paper sheet 57 is brought into contact with the platen 13 and the pinch ruler J4, and the upper end is brought into contact with the separation roller 34, so that the sheet 57 is prevented from returning upward, and the central part is slightly bent. It is maintained in a state with an inherent elastic force that extends up and down.

Next, when processing is performed on the paper sheet 57, for example, an operation is performed to start printing, the motor 16 starts! The Latin 13 is driven in the direction of forward rotation, and! The rotary force of the Latin 130 is transmitted to the timing 4 bolt 29.35 via the transmission gears 116, 25, the passive gear 21, and the timing 4 bolt 36.

Therefore! The paper sheet 52, which has been in a waiting state with its lower end in contact with the laten 13 and the pinch roller 14, is drawn between the platen 13 and the pinch roller 14 at the same time as the platen 13 starts rotating, and is pulled in between the platen 13 and the pinch roller 14 by the rotation of the platen 13. Paper is fed so that the paper sheet wraps around the outer periphery of the platen 13 along the idler 15, and printing, for example, on the left side is started. Thereafter, after the printing on the left side is completed, the platen 13 is rotated in the reverse direction to return the sheet 51 to the original printing start position.

At this time, if the trailing end of the paper sheet 57 is outside the paper sheet feeding device 12 when printing on the left side is completed, the nine sheets 57 are fed backwards and placed on the lower guide plate 89 and the third guide plate. The sheet is stored in the sheet storage section 91 via the space between the sheet and the sheet storage section 90 . Further, when the printing on the left side ends near the middle of the sheet 57 and the rear end of the sheet 52 is in the sheet feeding device 12, the nine sheets 57 are fed backwards and the nine sheets 57 are guided by the sheet guide plate 91VC. The sheet is then guided by the rotational force of the separation roller 34 to the side opposite to the sheet holding cassette 55 of the separation roller 34 . Therefore, as in the past, the paper leaf 51
There is no need to forcefully return the paper sheet 57 into the paper sheet holding cassette 55 and cause a jam phenomenon.In addition, when the rear end of the paper sheet 57 is between the separation roller 34 and the paper sheet holding cassette 55, the paper sheet 57 is reversely fed. Of course, the stolen paper 57 is guided into the paper holding cassette 55 (21-). When the sheet 57 is fed backwards, the solenoid 61 is not energized. When the paper leaf 52 returns to the predetermined position! The Latin 13 starts rotating forward and starts printing on the right side. After printing is completed, the receiving paper is transferred to the stocker 6 via the ID 92 and the receiving pinch roller 64.
Send within 3.

As described above, according to this embodiment, when the sheet 57 is reversely fed to print on the right side after the printing on the left side is completed, the printing on the left side ends near the middle of the sheet 57, and the printing on the left side ends at the rear end of the sheet 51. If the paper sheet holding cassette 55 is located below the sheet holding cassette 55 in the sheet feeding device 12, the rotational force of the separating roller 34 is used to remove the sheet holding cassette of the separating roller 34 via the paper industry guide plate 95. 55
Since the sheet can be guided to the opposite side, there is no need to forcefully return the sheet into the sheet holding cassette 55 as in the conventional case, and the occurrence of a jam phenomenon can be prevented. When the rear end of the sheet 57 is outside the sheet feeding device 12, the lower guide plate 89
and the third guide plate 90, the paper industry storage section 22
- When the sheet 57 can be returned into the sheet 91 and the rear end of the sheet 57 is between the separation roller 34 and the sheet holding cassette 55,
can be returned to the sheet holding cassette 55. Therefore, it is possible to operate functionally even in printing modes such as printing in two rows on the left and right separately, in which the sheet 57 that has been sent in the printing direction is returned to the printing start position again, and reliability can be significantly improved. can.

〔Effect of the invention〕

The sheet feeding device according to the present invention has a configuration in which a pinch roller is placed in circumferential contact with the platen and the platen is rotated in the normal direction so that nine sheets are inserted between the platen and the pinch roller and fed in a predetermined direction. A main body of a feeding device is detachably attached to an office machine, and the main body of the feeding device is provided with a paper sheet holding unit that presses the surface of a plurality of sheets held in a stacked manner at the inner end position of the paper sheets. a separation roller that rotates in a predetermined direction to feed the sheet at the end position between the platen and the pinch roller; a roller shaft that supports the separation roller and rotates integrally with the separation roller; There is a transmission mechanism that has a play angle in the rotational direction between the roller shaft and the transmission mechanism that transmits the rotation of the platen to the roller shaft. A silanizer mechanism that contacts a sheet of paper, and a control means that energizes the silanizer mechanism in response to a paper feed command signal and stops energizing the silanizer mechanism a short time after the platen switches from reverse rotation to forward rotation. and a paper guide plate that guides the paper to the side opposite to the paper holding portion of the separation roller when returning the paper with the trailing end of the paper being positioned under the paper holding portion after printing has started. The configuration includes the following.

Therefore, when a sheet of paper that has been sent in the printing direction is reversed and printed again, such as when printing in two rows on the left and right sides separately, even if the trailing edge of the sheet is under the force holding the sheet, the sheet guide plate will not hold the sheet. Since the paper sheet can be guided to the opposite side of the paper holding part of the separation roller, it prevents jamming and can also be used in printing situations where paper that has been sent in the printing direction is sent backwards and printed again. It can operate functionally and significantly improve reliability.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a paper sheet showing the case of printing in two rows on the left and right, and Figs. 2 to 11 are views showing an embodiment of the present invention. 3 is a vertical cross-sectional view showing the sheet feeding device in relation to the office machine, FIG. 4 is the same view showing the separating roller in contact with the uppermost sheet, and FIG. Figure 5 is a diagram showing the configuration of the control section.
Fig. 6 is a diagram for explaining the control of the control unit, Fig. 7 is a diagram for explaining the operation of the platen and solenoid, Fig. 8 is a perspective view of the rotating lever and separation roller, etc., and Fig. 9 is a diagram for explaining the operation of the platen and the solenoid. FIG. 8 is a partially detailed front view of FIG. 8, FIG. 10 is a partial vertical cross-sectional view of the vicinity of the platen, and FIG. 11 is an enlarged view of the separation roller and the vicinity of the lower part of the sheet holding cassette. 11... Office machine, 12... Paper sheet feeding device, 13...
・Platen, 14m, 14b...Pinch roller, 33
... Roller shaft, 34 ... Separation roller, 37 ... Rotary transmission 25-speed mechanism, 65 ... Sylanger mechanism, 69 ... Control section, 95 ... Paper guide plate. Applicant's agent Patent attorney Takehiko Suzue 261 In Figure 8 Figure 9. 7

Claims (1)

[Claims] By placing a pinch roller circumferentially around the platen and rotating the platen in the forward direction, the sheet of paper inserted between the pinch roller and the platen is fed in a predetermined direction (for an office machine configured as C). A main body of a feeding device is detachably attached, and a plurality of sheets of paper are stacked and held in a paper holding portion provided on the main body of the feeding device, and the paper sheet is pressed against the surface of the paper sheet at the inner end position and rotated in a predetermined direction. Particularly, there is a separation roller that feeds the sheet at the extreme end position between the platen and the pinch roller, a roller shaft that supports this separation roller and rotates integrally with the separation roller, and this roller shaft. a transmission mechanism that has an idle angle in the rotational direction and transmits the rotation of the platen to the roller shaft; and a silansha that, when energized, urges the pinch roller toward the paper sheet side and contacts the paper sheet at the extreme end position. a control means that energizes the plunger mechanism in response to a paper feed command signal and stops the energization of the plunger mechanism a short time after the platen switches from reverse rotation to forward rotation, and starts printing. and a sheet guide plate for guiding the sheet to the opposite side of the sheet holding portion of the separation roller when returning the sheet with the trailing end of the sheet being located at the lower force for holding the sheet. A paper sheet feeding device characterized by: