JPS59190135A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To have sure operation of paper feeding by furnishing an inertia crank having an inertia moment, which is enough to allow contact of a separator roller with the surface of sheets when a platen is in reverse rotation, and thereby providing easy control of the device with simple construction. CONSTITUTION:When a platen 13 is rotated reversely to allow rotation of levers 32a, 32b in the direction stoppers 39a, 39b, a separator roller 34 comes into contact with the uppermost sheet 57, and now only one sheet is taken out by the roller 34 and held while contacting the platen 13 and pinch roller 14. Here inertia cranks 46a, 46b stretch compression springs 62a, 62b and thereafter turn in the same direction quickly, and following the reduction of resilient force the levers 32a, 32b return in the direction toward the stoppers 38a, 38b. At this time the cranks 46a, 46b are rotated by the inertia force for a certain specific amount so as to hold the separator roller 34 at the position contacting the sheet 57. Thus the leading edge of the sheet is inserted at all times between the rollers, so that paper feed for the subsequent sheet is secured with sure operation, and further this arrangement requires simple control.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is detachably attached to an office machine such as a printer or a type-like machine, and is connected to the office machine by using the rotational force of a platen provided on the office machine side. The present invention relates to a paper sheet feeding device for feeding paper sheets.

[Technical background of the invention]

Printers, typewriters, etc. are configured such that a pinch roller is placed in circumferential contact with a platen, and by rotating the platen in the forward direction, a sheet of paper inserted between the platen and the pinch roller is sent 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 on the paper holding section are fed out 91 sheets at a time by a separating roller, and transferred to a platen and a pinch roller. However, while the sheet between the platen and the pinch roller is being fed in a predetermined direction, there is a possibility that the next sheet will be fed from the sheet feeding device. It is necessary to make sure that there is no such thing.

On the other hand, it is desired that the sheet feeding device is not provided with a drive source and that the sheet feeding device is made to use the rotational force of the platen on the office machine side to perform sheet feeding.

Therefore, when transmitting the rotational force of the platen to the separation roller on the sheet feeding device side, it is necessary to prevent the sheet feeding operation by the platen and the sheet feeding operation by the separation roller from being performed at the same time. It has been proposed to transmit the rotational force to the separation roller only when the platen rotates in the reverse direction, and to feed paper sheets between the platen and the pinch roller while rotating the platen in the reverse direction.

FIGS. 1 to 5 show examples of conventional devices developed based on this idea. In the figure, reference numeral 1 denotes a passive rotating body provided on the side of the sheet feeding device, which is driven in conjunction with the platen by a common drive source. Further, reference numeral 2 denotes a cam plate mounted on a shaft 3 common to the passive rotating body 1, and the rotational force of this cam plate 20 is transmitted to the separating roller on the sheet feeding device side. An engaging piece 4 is rotatably supported on the passive rotating body 1.

The cam plate 2 has a retaining portion 5 in a part thereof, and a swinging piece 6 is pivotally supported in the vicinity of the retaining portion 5. Swing piece 6
The spring 7 has one end in contact with the cam surface of the cam plate 2, and the other end covers the retaining opening 5. Further, the engagement piece 4 has an engagement pin 8 at its rotating end, and a spring 9 causes the engagement pin 8 to come into contact with the cam surface or the outer surface of the swinging piece 6.

Therefore, in order to rotate the separating roller on the paper sheet feeding device side by the drive source for driving the platen on the office machine side, the passive rotating body 1 is first rotated in the direction of the arrow as shown in FIG. The rotational direction of the drive source at this time is the direction in which the grating is rotated in the opposite direction.

As the passive rotating body l rotates, the locking pin 8 moves from the cam surface of the cam plate 2 to the outer surface of the swinging piece 6, and when the position of the locking pin 8 exceeds the fulcrum position of the swinging piece 6. The pressing force of the engagement pin 8 caused by the spring 9 overcomes the spring 7, causing the swinging piece 6 to swing as shown in FIG. 2, so that the other end of the swinging piece 6 comes into contact with the cam surface.

When the passive rotating body 1 further rotates in the same direction and the engagement pin 8 moves from the swinging piece 6 to the cam surface as shown in FIG. to return to.

When the rotational direction of the drive source is changed and the passive rotating body 1 is slightly rotated in the opposite direction (the direction in which the grating is rotated in the forward direction), the engagement pin 8 is moved into the engagement recess 5 of the cam plate 2 as shown in FIG.
It will fall into.

Next, when the rotational direction of the drive source is switched again and the passive rotary body 1 is returned to the initial rotational direction, the passive The rotating body 1 and the cam plate 2 rotate together, the rotational force of the cam plate 2 is transmitted to the separation roller on the paper sheet feeding device side, and the rotation of the separation roller feeds the paper sheets to the office machine side. become.

[Problems with background technology]

As described above, in conventional devices that feed sheets using a drive source for driving the platen on the office machine side, the separation roller is rotated only when the platen is rotated in the reverse direction. It requires a complicated mechanism that combines the plate 2, the engagement piece 4, the swinging piece 6, etc., and the rotation direction of the drive source must be changed many times, and the control on the office machine side to control the drive source is required. There was also the problem that the system became complicated.

Furthermore, it is necessary to replenish the sheet feeding device with sheets while the separating roller is separated from the surface of the sheet, but this operation also has to be performed as a separate operation, which is troublesome.

[Purpose of the invention]

The present invention was made based on these circumstances, and
The purpose of this is to use an extremely simple configuration to feed paper sheets by transmitting the rotational force of the platen on the office machine to the separation roller, eliminating the need for troublesome operations when replenishing paper sheets, etc. An object of the present invention is to provide a paper sheet feeding device with reliable paper operation.

[Summary of the invention]

The present invention provides a paper sheet feeding device that feeds paper sheets to an office machine using the rotational force of a silencer on the side of the office machine. At the same time, an inertia crank body is provided, and the inertia crank body and the rotary lever are connected to each other by pressure springs, and the rotary lever is rotated back and forth as the crank rotates. The rotational force transmission mechanism is configured to transmit the rotational force of the platen to the separation roller and also to the inertial crank body via a one-sided clutch, so that when the platen rotates in reverse, the rotational force of the platen is transmitted to the separation roller. is configured to rotate in a predetermined sheet feeding direction, and rotate a rotary lever in a direction to press the separation roller against the surface of the sheet, and the mounting portion of the pressure spring of the inertial crank body rotates. When the rotation lever is rotated by the biasing force of the return spring beyond the farthest position with respect to the lever, the mounting portion of the pressure contact spring is rotated by the inertia force beyond the closest position with respect to the rotation lever, and the rotation lever is rotated by the biasing force of the return spring. The separation roller is characterized in that it has a sufficient moment of inertia to rotate the separation roller against the surface of the sheet and bring the separation roller into contact with the surface of the sheet.

Therefore, with an extremely simple configuration, the rotational force of the platen can be transmitted to the separation roller to feed paper sheets, and the separation roller is pressed against the surface of the paper sheet only when the platen is rotating in the opposite direction. Therefore, when replenishing paper sheets, etc., there is no need to pull the separating roller away from the surface of the paper sheets.

In addition, when the paper feeding operation is finished, the inertia crank body rotates due to inertia and the separation roller stops with the paper sheet surface in contact with the surface of the paper sheet, so the fed paper sheet does not return and the paper sheet is It is held in a bent position. Therefore, due to the elastic force of this sheet, its leading edge is always inserted between the platen and the pinch roller, and when the sheet is then fed onto the platen, it is immediately inserted between the platen and the pinch roller. Since the pressure is applied, the paper feeding operation is ensured.

[Embodiments of the invention]

Figures 6 to 10 show one embodiment of the present invention, and Figure 6 shows a state in which a paper sheet feeding device 12 is attached to the top surface of an office machine 1 such as a printer or a typewriter. ing. The paper supply device 12 is detachable from the office machine 11. Further, FIG. 7 is a longitudinal cross-sectional view showing the sheet feeding device 12 in relation to the office machine 11 side, with one (front side) side plate omitted.

As shown in FIG. 7, the office machine 11 includes a platen 13, a pinch roller 14 surrounding the platen, a plate 74 guide 15 disposed along the outer periphery of the platen 13, a motor 16 for driving the platen, and the like.

On the other hand, the sheet feeding device 12 is provided with a removable mount J8 at the bottom of the feeding device main body 17.

A platen gear 2θ and a platen pulley 21 are attached to a shaft 19 of the platen 13, and a motor 16 side 22 is configured to drive the platen pulley 21 via a belt 23.

The mounting base J8 of the paper sheet feeding device 12 is mounted on the office machine 11 by placing the legs 24 provided on the front part -10 = left and right (only one side is shown) on the platen shaft 19. , one leg 24 is provided with a pair of upper and lower transmission gears 25 and 26, and the lower transmission gear 26 is meshed with the platen gear 20.

Further, a passive gear 27 and a timing pulley 28 are coaxially provided at the lower part of one side plate of the supply device main body 17, and the passive gear 27 is meshed with the transmission gear 25. Furthermore, one side plate has one on the front and two on the rear.
timing pulley 29.・30 and 31 are provided respectively. Further, the left and right side plates (only one side is shown) of the supply device main body 17 have rotating levers 32a and 32b, respectively.
are provided as shown in FIG. 8, and a roller shaft 33 is rotatably supported at both ends of both levers 32a and 32b. A pair of left and right separation rollers 34 and a timing pulley 35 are integrally attached to the roller shaft 33, respectively. And these timing pulleys 2B,
A timing belt 36 is wrapped around 29, 35, 30.31, and the rotation transmission mechanism 3 is connected to the transmission gear 25.26.
7 is made up. In addition, 38a, 38b: 39 in the figure
a.

39b is a stop/4' for limiting the rotation range of the rotation levers 32m and 32b. Also, 40.4 in Figure 7
1 is in contact with the back side of the timing belt 36 and this belt 3
A tension roller 42 is pressed against the back surface of the belt 36 by the elasticity of a spring 43. The timing pulley 30 has a small gear 4.
4 are integrally provided. A crankshaft 45 supported between the left and right side plates of the device main body 17 is disposed below the timing boot IJ 30. At both ends of the crankshaft 45, there are disc-shaped inertial crank bodies 46a as shown in Figure 8.

46b is integrally attached, and one end of the crankshaft 45 is equipped with a large diameter reduction gear 47.
8 is provided. The reduction gear 47 is meshed with the small gear 44 to transmit 300 rotations of the timing pulley to the one-sided clutch 48. In addition,
When the one-way crank 48 rotates counterclockwise in FIG.
The structure is such that the transmission is transmitted to the rotation direction, and the transmission is not transmitted when rotating clockwise. Further, on the outer periphery of one inertial crank body 46h, one end of the brake lever 49 and a spring 5 are attached as shown in FIG.
00 elasticity.

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

A sheet receiving roller 52 is integrally attached to this shaft 5, and a one-sided clutch 5 is attached to one end of the same shaft 51.
3 is provided. When the timing pulley 29 rotates counterclockwise in FIG.
When the timing pulley 29 rotates clockwise, the transmission is not transmitted to the timing pulley 29.

In addition, cassette loading grooves 5413- are provided on the inner surfaces of the left and right side plates (only one side is shown) of the feeding device main body 17, and paper sheet holding cassettes 55 as sheet holding sections are provided in both loading grooves 54. It is loaded from above at a slightly backward angle compared to 17.

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 downward 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 restricted by bringing the surface into contact with the striker 59.

Both rotating levers 32a, 32b and paper holding cassette 5
5 is such that the separation roller 34 can be selectively brought into contact with the lower surface of the uppermost sheet 57 by rotation of the rotation levers 32a, 32b. and each rotating lever 32a.

32b is constantly biased by return springs 60 and 60b in the direction of separating the separation roller 34 from the surface of the paper sheet 57, and the rollers 32b and 32b are constantly biased in a direction to separate the separation roller 34 from the surface of the paper sheet 57, and the rollers 32b and 32b are always biased in the direction of separating the separation roller 34 from the surface of the paper sheet 57.

It is held in contact with 38b. Further, one end of the connecting pieces 61h, 61b is pivotally supported on each of the inertial crank bodies 46a, 46b at a position deviated from the center of rotation by a certain amount.
1h, the other end of 61b and each inertia crank body 46g, 46b
A pressure contact spring 62 such as a tension boiling spring is provided between the
a.

62b is spanned. The above pressure contact spring 62a #62b
, the rotating levers 32h, 3'2b are the stoppers 38h, 3
8b side has reeds and a connecting piece 61a.

It is adjusted so that when the lever 61b approaches the pivot levers 32e, 32b, it has almost a free length (zero tension). The connecting pieces 61a and 61b are connected to the inertial crank body 46a.
, 46b (counterclockwise rotation in FIG. 7), the further away from the rotating levers 32a and 32b,
The tension of the pressure contact springs 62h, 62b increases, and the rotation lever 32a resists the return springs 6θa, 60b.

, 92b are rotated toward the stoppers 39a, 39b, and the connection pieces 61m, 61b are separated while they move within a certain range (that is, while the inertial crank bodies 46m, 46b move within a certain range every rotation). The roller 34 is configured to be brought into pressure contact with the surface of the paper sheet 57. The inertia crank bodies 46a, 46b are pressed against the springs 62h, 62b.
When the mounting portion of the rotating levers 32h, 32b is rotated by the biasing force of the return springs 60m, 60b beyond the farthest position with respect to the rotation levers 32h, 32b, the inertia force causes the pressure contact springs 62h, 62
The attachment part b rotates beyond the closest position to the rotation levers 32h and 32b, and the rotation levers 32h and 32b are rotated against the biasing force of the return springs 60m and 60b, and the separation roller 34 is separated from the paper sheets. It is configured to have a sufficient moment of inertia to still contact the surface.

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 11 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.

Reference numerals 65 and 66 in FIG. 7 indicate a supply paper guide and a receiving paper guide provided at the lower part of the main body 17 of the supply device, and the supply paper guide 65 is used for paper sheets taken out by the separation roller 34. 57 between the platen 13 and the pinch roller 14 on the side of the office machine 11. The paper guide 66 for receiving processed paper sheets 57 that has been sent out from the side of the office machine 11 is guided between the platen 13 and the pinch roller 14 on the side of the office machine 11. 52 and the receiving pinch roller 64. Further, a single sheet insertion guide 67 is provided at the lower end of the back plate of the stocker 63, which communicates with the supply paper guide 65 from the inside of the stocker 63.

Next, the operation will be explained.

First, sheets 57 of a certain size are stacked on the sheet placement plate 56 of the sheet holding cassette 55, and the cassette 55 is inserted into the cassette loading groove 54 to create the state shown in FIG.

17- Then, when a predetermined operation for feeding the paper sheet 57 is performed, the motor 16 on the office machine 11 side starts to rotate the platen 13 in the reverse direction (counterclockwise rotation in FIG. 7).
let The rotational force of the platen gear 200 is transmitted to the transmission gear 2.
6.25 and then transmitted to the driven gear 27. And then, through the timing belt 36, the timing boo! Rotate J so, ss, 29 clockwise in the diagram,
The rotational force of the timing pulley 300 is transmitted to the inertia crank body 46h via the one-way clutch 48.

46b.

As a result, the inertia crank bodies 46m, 46b rotate clockwise in the figure as shown in FIG. ga styno 438m
, rotates from the 38b side to the Systra 1439*, 39b side. Then, the separation roller 34 comes into pressure contact with the surface of the uppermost paper sheet 57, and the rotation of the separation roller 34 causes only 91 sheets of paper 57 to be removed.
is taken out and fed between the platen 13 and the pinch roller 14 through the feeding paper guide 18-6'5. Note that at this time, the platen 13
is rotating in the opposite direction, so the sheet 57 fed upward is not drawn between the platen 13 and the pinch roller 14, and the lower end of the sheet 57 contacts the platen 13 and the pinch roller 14. held in a fixed position.

On the other hand, the inertia crank bodies 46a and 46b are pressed against the spring 6.
After stretching 2a and 62b to their maximum length, they rapidly rotate in the same direction due to the elasticity stored in these springs 62g and 62b, and as the elastic force of these springs 62a and 62b decreases, The rotation levers 32a and 32b are the return springs 60
a.

60b and cyst collar 38a, 38b (II
Return to.

At this time, the power supply to the motor 16 is stopped, but since the inertia crank bodies 46a and 46b have a predetermined moment of inertia, they do not remain in the position where the pressure contact springs 62a and 62b have the shortest length, and their own inertia Rotates by a predetermined amount.

Therefore, the rotating levers 3211, 32b are again struck.
7 a+ 39 a.

39b direction, and the separation roller 34 is held in a position where it is in light contact with the upper end of the sheet 57 that has been sent out. Here, as shown in FIG. 10, the paper sheet 57 has its lower end in contact with the platen 13 and the pinch roller 14, and its upper end in contact with the separation roller 34, so that it is prohibited from returning upward, and its center portion is brought into contact with the separation roller 34. It is held in a state where it is slightly bent and has an elastic force that extends up and down.

Next, when the paper sheet 57 is processed, for example, an operation to start printing is performed, the motor 16 is driven in the direction of forward rotation of the grating 13, and the rotational force of the platen 13 is transferred to the transmission gear 26° 25 and the passive gear 27. and is transmitted to the timing pulleys 29, 35, and 3θ via the timing belt 36.

The paper sheet 57, which was in a waiting state with its lower end in contact with the platen 13 and the pinch roller 14, is drawn between the platen 13 and the pinch roller 14 at the same time as the grating 13 starts rotating. The paper is fed along the epa guide 15 so as to wrap around the outer periphery of the platen 13.

Furthermore, since the direction of rotation of the timing pulley 30 at this time is reverse rotation for the one-sided clutch 48, no rotational force is transmitted to the cranks 46g, 46b. When the timing belt 36 starts running, the rotation lever 3
The levers 2a and 32b are immediately returned to the side of the stoppers 38a and 38b by the return springs 60a and 60b, but the tension of the timing belt 36 also helps the rotation levers 32a and 32b to return, and the separating roller 34 is moved back to the paper sheet 57. This will cause the surface to be spaced apart. Therefore, even though the rotational direction of the separation roller 34 is opposite to the sheet feeding direction, the next sheet will not be fed during the forward rotation of the grating 13.

On the other hand, the paper sheets 57 processed in the office machine 11 are guided through the receiving paper guide 64 between the paper sheet receiving roller 52 and the receiving pinch roller 64, but at this time,
The rotational force from the platen 13 side is transmitted to the sheet receiving roller 21-52 via the one-sided clutch 53, and the direction of rotation is the direction in which the sheet 57 is sent upward. + The paper leaf 57 sent out from the office machine 11 side through the guide 64 is passed through the paper leaf receiving roller 52 and the receiving pinch roller 6.
4, and is sent upward and stored in the stocker 63.

Therefore, according to the paper sheet feeding device configured in this way, the separation roller 3 is rotated by rotating the inertia crank bodies 46a and 46b.
4 is selectively brought into pressure contact with the surface of the sheet 57, the rotational force of the platen 13 can be transmitted to the separation roller 34 even when the platen 13 rotates in any direction. By adopting such a configuration, a complicated mechanism as shown in FIGS. 1 to 5 is not required, and a simple configuration can be achieved. Further, since the separation roller 34 does not come into pressure contact with the surface of the paper sheet 57 unless the platen 13 is rotated in the reverse direction, the separation roller 34 is required to pull out and insert the paper sheet holding cassette 55 when replenishing the paper 22-sheets, etc. This can be easily done without involving the operation of separating 34.

Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, the rotating levers 32 a j32 b
s inertia crank body 46a, 46b1 return spring 60*,
60b, pressure contact springs 62th, 62b, etc. are provided in pairs on the left and right sides and are operated simultaneously on the left and right sides, thereby making the plurality of separating rollers 34 evenly contact with the surface of the sheet 57. One shaft is rotatably supported, and left and right turning levers 32a are provided at both ends of the shaft.
, 32b are fixed and the levers 32h, 32b are configured to operate integrally, so that the inertia crank body, the return spring, the pressure contact spring, etc. can be provided only on one side. If there is only one separation roller 34, one end of the roller shaft 33 is supported by the rotating lever 32h as shown in FIG.
The other end of the separating roller 34 can be moved toward and away from the surface of the paper sheet 57 by supporting the other end of the separating roller 34 on the other side plate and rotating one of the rotating levers 32a. Further, in the embodiment described above, a mechanism using gears and belt transmission is employed as the rotation transmission mechanism 37, but the rotation transmission mechanism is not limited to this, and may be configured using only gears, for example.

〔Effect of the invention〕

As detailed above, the present invention relates to a printer.

In a paper sheet feeding device that feeds paper sheets to the office machine using the rotational force of a platen installed in an office machine such as a tie writer, the rotating lever that supports the separation roller is moved by a return spring. At the same time, an inertia crank body is provided, and the inertia crank body and the rotary lever are connected by a pressure spring, and the rotation of the inertia crank body causes the rotary lever to reciprocate. Further, the rotational force transmission mechanism is configured to transmit the rotational force of the platen to the separating roller and also to the inertial crank body via the one-way helical lug and ch. When rotating, the separation roller is rotated in a predetermined sheet feeding direction, and a rotary lever is rotated in a direction to press the separation roller against the surface of the sheet. When the rotation lever is rotated by the biasing force of the return spring beyond the farthest position with respect to the rotation lever, the mounting portion of the pressure contact spring is rotated due to the inertia force beyond the furthest position with respect to the rotation lever, and the rotation lever is rotated by the urging force of the return spring. The separation roller is characterized in that it has a sufficient moment of inertia to rotate the separation roller against the urging force of the separation roller and bring the separation roller into contact with the surface of the sheet.

Therefore, with an extremely simple configuration, the rotational force of the platen can be transmitted to the separation roller to feed the paper sheets, and the separation roller is pressed against the surface of the paper sheets only when the platen rotates in the reverse direction. Even when replenishing paper sheets, it is not necessary to perform a special operation to separate the separation roller from the surface of the paper sheets, and other advantages can be obtained.

In addition, when the paper feeding operation is completed, the inertia crank body -25= rotates due to inertia and the separation roller stops in contact with the surface of the paper sheet, so the fed paper sheet does not return and the paper sheet is scattered. It is held in a bent position. Therefore, due to the elastic force of this sheet, its leading edge is always inserted between the platen and the pinch roller, and when the sheet is then fed onto the platen, it is immediately inserted between the platen and the pinch roller. Since the pressure is applied, the paper feeding operation is ensured.

[Brief explanation of the drawing]

Figures 1 to 5 are plan views showing a conventional example, Figures 6 to 8 show an embodiment of the present invention, and Figure 6 shows a state in which a paper sheet feeding device is installed in an office machine. Perspective view shown, No. 7
The figure is a longitudinal sectional view showing the paper sheet feeding device in relation to an office machine.
FIG. 8 is a schematic perspective view showing the relationship between the rotary lever and the crank, FIG. 9 is a vertical sectional view of the sheet feeding device showing different operating states, and FIG. 10 is a schematic diagram illustrating the operation. 11... Office machine, 12... Paper sheet feeding device, 13...
26- platen, 14... pinch roller, 32a, 32b...
... Rotation lever, 34 ... Separation roller, 37 - Rotation transmission mechanism, 46a, 46b ... Inertia crank body, 48
...One-way clutch, 55...Paper holding cassette (
paper sheet holding section), 52... paper sheet, 60a, 6θb...
Return spring, 62m, 62b... pressure contact spring. Applicant's agent Patent attorney Takehiko Suzue 27- Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] Detachably attached to an office machine configured so that paper sheets inserted between the platen and the pinch roller are fed in a predetermined direction by placing a pinch roller around the platen and rotating the platen in the normal direction. a feeding device main body, a rotating lever rotatably provided on the feeding device main body,
This rotary lever is pivotally supported, and when the rotary lever rotates in one direction, it presses against the surface of the outermost sheet among the multiple sheets stacked and held in the sheet holder and moves it in a predetermined direction. a separation roller that rotates to feed the paper sheet at its end position between the platen and the pinch roller; and a return force that urges the rotary lever in a direction to separate the separation roller from the paper sheet. The rotary lever is connected to the rotary lever through a spring and a press-contact spring rotatably provided on the main body of the supply device, and the rotary lever is rotated against a return spring while the rotary lever moves within a certain range for each rotation. When the separation roller is brought into pressure contact with the surface of the paper sheet, and when the mounting portion of the pressure contact spring is rotated by the elastic force of the return spring beyond the farthest position with respect to the rotary lever, the pressure contact spring is removed by inertia force. The mounting portion of the rotating lever is rotated past the closest position relative to the rotating lever, and the rotating lever is rotated against the biasing force of the return spring to bring the separation roller into foil contact with the surface of the paper sheet. an inertia crank body having a sufficient moment of inertia; a one-way clutch that is provided coaxially with the inertia crank body and transmits rotational force in only one direction to the inertia crank body; The paper is characterized in that it is equipped with a rotation transmission mechanism that transmits the rotational force of the platen and rotates the one-way lathe and ch in the rotational force transmission direction when the platen rotates in the reverse direction, and also rotates the separation roller in the paper sheet supply direction. Leaf feeding device.