JPH033591B2 - - Google Patents

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 typewriter, 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]

2. Description of the Related Art Printers, typewriters, and the like are configured such that a pinch roller is circumferentially attached to a platen, and by rotating the platen in the normal 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 in the paper holding section are taken out one by one by a separating roller and placed between a platen and a pinch roller. However, while the sheet between the platen and the pinch roller is being fed in a predetermined direction, the next sheet is not fed from the sheet feeding device. It is necessary to

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 feeding operation by the platen and the sheet feeding operation by the separation roller from being performed at the same time.One way to do this is to reverse the platen. It has been proposed to transmit the rotational force to the separation roller only when the platen rotates, and to feed paper sheets between the platen and the pinch roller while rotating the platen in the opposite 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 2 is transmitted to the separation 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 an engagement recess 5 in a part thereof, and a swinging piece 6 is pivotally supported in the vicinity of the engagement recess 5 . The swinging piece 6 has one end connected to the cam plate 2 by a spring 7.
The engagement recess 5 is contacted with the cam surface of the engagement recess 5 at the other end. Further, the engagement piece 4 has an engagement pin 8 at its rotating end, and a spring 9 brings the engagement pin 8 into contact with the cam surface or the outer surface of the rocking piece 6.

Therefore, in order to rotate the separation roller on the 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 platen is rotated in the opposite direction.

As the passive rotating body 1 rotates, the engagement pin 8 moves from the cam surface of the cam plate 2 to the outer surface of the rocking piece 6,
When the position of the engagement pin 8 exceeds the fulcrum position of the swinging piece 6, the pressing force of the engagement pin 8 by the spring 9 overcomes the spring 7, and the swinging piece 6 swings as shown in FIG. Piece 6
The other end will come 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. 3, the swinging piece 6 is returned to its original position by the spring 7.

Here, when the rotational direction of the drive source is switched and the passive rotating body 1 is slightly rotated in the opposite direction (the direction in which the platen is rotated forward), 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 rotating body 1 is returned to the initial rotational direction, the engaging pin 8 is engaged with the engaging recess 5 of the cam plate 2, as shown in FIG. 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 paper 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 a problem that made the system 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 has been made based on the above circumstances, and its purpose is to feed paper sheets by transmitting the rotational force of the platen on the office machine side to the separation roller with an extremely simple configuration, and to feed paper sheets. It is an object of the present invention to provide a sheet feeding device that does not require troublesome operations when replenishing or the like.

[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 platen on the office machine, in which the roller shaft of a separation roller is supported by a rotary lever, and the roller shaft is An operating gear is attached to the rotating lever, and an interlocking gear that meshes with the operating gear and a rotating cam coaxial therewith are provided on the rotating lever.Furthermore, a cam engaging member is provided on the feeder main body 1, and this member is connected to the rotating cam. The rotational force of the platen is transmitted to the operating gear or the interlocking gear by a rotation transmission mechanism, and only when the platen rotates in the opposite direction, the rotational force of the interlocking gear is transferred to the rotating cam via the one-way clutch. The rotating lever rotates back and forth as the rotating cam rotates, and while the separation roller is in contact with the surface of the paper sheet, the rotational force of the separation roller causes the sheet feeding operation to be performed. It is characterized by being made to perform.

[Embodiments of the invention]

6 to 9 show an embodiment of the present invention, and FIG. 6 shows a state in which a sheet feeding device 12 is mounted on the top surface of an office machine 11 such as a printer or a typewriter. Paper sheet supply device 12 is office machine 11
It can be attached and detached freely. 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 has a platen 1
3. A pinch roller 14 surrounding this, and a paper guide 15 disposed along the outer periphery of the platen 13.
and a motor 16 for driving the platen.

On the other hand, the sheet feeding device 12 is provided with a detachable mounting base 18 at the bottom of the feeding device main body 17.

A platen gear 20 and a platen pulley 21 are attached to a shaft 19 of the platen 13, and a motor pulley 22 on the motor 16 side is configured to drive the platen pulley 21 via a belt 23.

The mounting base 18 of the paper sheet feeding device 12 is mounted on the office machine 11 by placing the legs 24 provided on the front left and right sides (only one side is shown) on the platen shaft 19. 24 has a pair of upper and lower transmission gears 2.
5 and 26 are provided to mesh the lower transmission gear 26 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 timing pulleys 2 at the front and center.
9 and 30 are provided, respectively. Further, a rotation shaft 31 is supported at both ends of the left and right side plates (only one side is shown) of the supply device main body 17. Rotating levers 32 are provided at both ends of this rotating shaft 31, respectively.
a and 32b are fixed as shown in Fig. 8, and both levers 3
A roller shaft 33 is rotatably supported at both ends of the roller shafts 2a 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 28,2
A timing belt 36 is wrapped around the timing belts 9, 35, and 30, and together with the transmission gears 25 and 26, a rotation transmission mechanism 37 is constituted. Further, reference numeral 41 in FIG. 7 is a tension pulley pressed against the back surface of the belt 36 by the elasticity of a spring 43.

A small-diameter operating gear 44 is attached to one end of the roller shaft 33 integrally with the timing pulley 35. Further, a large-diameter interlocking gear 45 that meshes with an operating gear 44 is pivotally supported on one of the rotating levers 32a. Furthermore, a rotating cam 46 is provided coaxially with this interlocking gear 45, so that when the interlocking gear 45 rotates clockwise in FIG. It is configured. The rotating cam 47 has radius dimensions that differ by about 180°, with about half of the outer circumference being a long radius portion 47a and the other half being a short radius portion 47b.

On the other hand, a pulley 48 as a cam engaging member is rotatably provided in the supply device main body 17. A return spring 5 is inserted between the spring hook pin 49 provided on a part of the rotating cam 47 and the shaft of the pulley 48.
0 is hung, and this spring 50 causes the rotating cam 4 to
The annular cam surface or outer periphery of 7 is always pressed against the outer periphery of the pulley 48, and the rotating cam 47 is elastically held at a fixed position.
The terminal end of the short radius portion 47b is configured to be in contact with the pulley 48.

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 51, and a one-way clutch 53 is provided at one end of the same shaft 51. This one-way clutch 53 transfers the rotational force to the shaft 5 when the timing pulley 29 rotates counterclockwise in FIG.
1 to the sheet receiving roller 52, and is not transmitted when the timing pulley 29 rotates clockwise.

Furthermore, cassette loading grooves 54 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 portions are installed in both loading grooves 54. On the other hand, it is loaded from above 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. Also, the paper sheet placement plate 56
The lower end of the sheet 57 is urged outward from the lower side by a spring 58, and the maximum amount of rotation in the urging direction is such that the surface of the uppermost sheet 57 stacked and held comes into contact with the stopper 59. It is configured to be limited by this.

The rotating levers 32a, 32b and the sheet holding cassette 55 move the separation roller 34 to the uppermost sheet 5 position by rotating the rotating levers 32a, 32b.
The relationship is such that it can be brought into selective contact with the lower surface of 7.

Furthermore, a stocker 63 is provided at a position in front of the cassette loading groove 54 to receive processed paper sheets 57 sent out from the office machine 11 side.
The sheet receiving roller 52 is located at a lower position of this stocker 63, and the receiving pinch roller 6
It surrounds 4.

In addition, 65 and 66 in FIG. 7 are the supply device main body 17.
A feeding paper guide and a receiving paper guide are provided at the bottom of the paper. The supply paper guide 65 guides the paper sheet 57 taken out by the separation roller 34 between the platen 13 and the pinch roller 14 on the office machine 11 side, and the receiving paper guide 66 guides the paper sheet 57 taken out by the separation roller 34 between the platen 13 and the pinch roller 14 on the office machine 11 side. The processed paper sheet 57 sent out from the side is guided from below between the paper sheet receiving roller 52 and the receiving pinch roller 64. Further, at the lower end of the back plate of the stocker 63, a single sheet insertion guide 67 is provided which leads from the inside of the stocker 63 to the paper supply guide 65.
is provided.

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 form the state shown in FIG.

Therefore, when a predetermined operation for feeding paper sheets 57 is performed, the motor 16 on the office machine 11 side is activated to rotate the platen 13 in the reverse direction (counterclockwise rotation in FIG. 7). The rotational force of the platen gear 20 is then transmitted to the passive gear 27 via the transmission gears 26 and 25 in sequence. Further, via the timing belt 36, the timing pulley 29,
35 and 30 in the clockwise direction in the figure, the rotational force of the timing pulley 35 is applied to the operating gear 44 and the interlocking gear 4.
5 and the rotating cam 4 via the one-way clutch 46
7.

As a result, the rotating cam 47 rotates counterclockwise in the figure. At this time, the long radius portion 47 of the rotating cam 47
Since point a comes into contact with pulley 48, rotating levers 32a and 32b rotate rightward in FIG. 7. Therefore, the separation roller 34 comes into pressure contact with the surface of the paper sheet 57 at the uppermost position as shown in FIG.
While the long radius portion 47a is in contact with the pulley 48, one sheet of paper 57 is taken out by the rotation of the separation roller 34, and is fed between the platen 13 and the pinch roller 14 through the feeding paper guide 65. become. Note that at this time, the platen 13 is rotating in the opposite direction, so the paper sheet 57 fed from above is not drawn into between the platen 13 and the pinch roller 14, and the lower end of the paper sheet 57 is placed on the platen 13.
and is held at a fixed position in contact with the pinch roller 14.

On the other hand, when the rotating cam 47 rotates approximately 180 degrees, the short radius portion 47b comes into contact with the pulley 48, and at this time, the rotating levers 32a, 32b rotate to the left in FIG.
is pulled away from the surface of the paper sheet 57.

Next, when processing is performed on the paper sheet 57, for example, an operation to start printing is performed, the motor 16 is driven in the direction of forward rotation of the platen 13, and the rotational force of the platen 13 is transferred to the transmission gears 26, 25 and the passive gear 27. and is transmitted to the timing pulleys 30, 35, and 29 via the timing belt 36.

Then, 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 platen 13 starts rotating.
3, the paper is fed along the paper 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 opposite to that of the one-way clutch 46, the rotational force of the interlocking gear 45 is not transmitted to the rotating cam 47. Then, the separation roller 34
Since the separation roller 34 is spaced apart from the surface of the platen 13, the next sheet will not be fed during forward rotation of the platen 13, even though the rotation direction of the separation roller 34 is opposite to the sheet feeding direction.

On the other hand, the paper sheet 57 processed in the office machine 11 is guided between the paper sheet receiving roller 52 and the receiving pinch roller 64 through the receiving paper guide 66; Since the rotational force from the platen 13 side is transmitted via the one-way clutch 53, and the direction of rotation is to send the paper sheets 57 upward, the paper sheets 57 are sent out from the office machine 11 side through the receiving paper guide 66. The paper sheet 57 that has been removed is drawn between the paper sheet receiving roller 52 and the receiving pinch roller 64, is sent upward, and is stored in the stocker 63.

Therefore, according to the sheet feeding device configured in this way, the rotary cam 47 is rotated via the one-way clutch 46, and the rotary levers 32a, 32b are rotated only when the platen 13 rotates in the reverse direction. Since the separating roller 34 is brought into pressure contact with the surface of the sheet 57, rotational force can be transmitted to the separating 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 becomes unnecessary, and a simple configuration can be achieved. Furthermore, the separation roller 34 is connected to the platen 13.
Since it does not come into pressure contact with the surface of the paper sheet 57 unless it is rotated in the reverse direction, the paper sheet holding cassette 55 can be pulled out and inserted when replenishing paper sheets, etc., without having to separately separate the separation roller 34. , can be easily done.

Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, the rotation transmission mechanism 37
Although a mechanism based on gears and belt transmission is adopted as a mechanism, the rotation transmission mechanism is not limited to this, and may be configured using only gears, for example.

〔Effect of the invention〕

As described in detail above, the present invention provides a paper sheet feeding device that feeds paper sheets to an office machine using the rotational force of a platen on the side of the office machine, in which the roller shaft of the separation roller is rotated by a rotating lever. In addition to supporting the roller shaft, an operating gear is attached to the roller shaft, and the rotating lever is provided with an interlocking gear that meshes with the operating gear and a rotating cam that is coaxial with the interlocking gear, and furthermore, a cam engagement member is provided on the supply device main body 1. A lever member is brought into contact with the annular cam surface of the rotary cam, and a rotation transmission mechanism transmits the rotational force of the platen to the operating gear or the interlocking gear, so that the rotational force of the interlocking gear is transferred in one direction only when the platen rotates in the opposite direction. The rotation lever is configured to rotate back and forth as the rotating cam rotates, and the rotation of the separating roller is controlled while the separating roller is in contact with the sheet surface. It is characterized in that the paper sheet feeding operation is performed by force.

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 an operation to separate the separation roller from the surface of the paper sheets, and other excellent effects can be obtained.

[Brief explanation of the drawing]

Figures 1 to 5 are plan views showing a conventional example, Figures 6 to 9 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. 7 is a vertical sectional view showing the 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, and FIG. 9 is a sheet feeding operation state. FIG. 11... Office machine, 12... Paper sheet feeding device, 13
...Platen, 14...Pinch roller, 32a,
32b...Rotating lever, 34...Separation roller, 3
7... Rotation transmission mechanism, 44... Operating gear, 45...
...Interlocking gear, 46...One-way clutch, 47...
Rotating cam, 48...Pulley (cam engagement member), 5
0...Return spring, 55...Paper holding cassette (paper holding section), 57...Paper.

Claims (1)

[Claims] 1. A device that can be detachably attached to an office machine configured to have a pinch roller circumferentially attached to the platen and rotate the platen in the normal direction so that paper sheets inserted between the platen and the pinch roller are fed in a predetermined direction. The main body of the feeding device to be mounted, the rotating lever rotatably provided on the main body of the feeding device, and the rotating lever is pivoted on the rotating lever, and when the rotating lever rotates in one direction, the sheets are stacked on the sheet holder. a separation roller that presses against the surface of the paper sheet at the endmost position among the plurality of sheets held and rotates in a predetermined direction to supply the paper sheet at the endmost position between the platen and the pinch roller; an operating gear that rotates integrally with the separation roller; an interlocking gear that is pivotally supported by the rotary lever so as to mesh with the operating gear; and transmitting the rotational force of the platen to either the interlocking gear or the operating gear. a rotational force transmission mechanism, a rotating cam coaxially provided with the interlocking gear, a one-way clutch that transmits the rotational force of the interlocking gear to the rotating cam only when the platen rotates in reverse, and an annular shape of the rotating cam. a cam engaging member that is provided on the feeding device main body so as to be in contact with a cam surface, and that rotates the rotary lever back and forth as the rotary cam rotates to temporarily hold the separation roller in a position where it is brought into pressure contact with the sheet surface; and a return spring that elastically holds the rotary lever at a position where the separating roller is separated from the surface of the sheet by holding the rotary cam at a constant position.