JPS6219336B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper feeding device that separates and feeds a plurality of stacked sheets one by one, and particularly relates to a paper feeding device used in facsimile machines, copying machines, and the like.

For example, in a facsimile machine, various types of paper feeding devices have been proposed for feeding multiple sheets of transmission documents one by one to the reading section of the facsimile machine, one of which is the sheet feeding device. a separation roller that is rotationally driven in the sheet feeding direction; a brake member that contacts the circumferential surface of the separation roller; and a feeder that is provided in a sheet feeding path in front of the separation roller and that is rotationally driven in the sheet feeding direction. the feeding roller feeds the originals to be sent between the separation roller and the brake member, and the originals to be sent are removed from the originals to be sent, excluding the original closest to the separation roller. There is a known paper feeding device configured to apply a braking action using the brake member to prevent the document from passing, and to feed only the one document closest to the separation roller by passing through it. ing.

In the above-mentioned type of paper feeding device, if sheets such as the original to be sent are sequentially fed between the separating roller and the brake member, the sheets will be separated and fed one after another, but the sheets may curl or curl. For example, if the sheet rolls upward and is not fed between the separating roller and the brake member, the sheet will not be separated and fed, resulting in a paper jam.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding device that is improved in the above-mentioned respects.

According to the present invention, the present invention provides a separation roller that is rotatably driven in the sheet feeding direction, a brake member that contacts the circumferential surface of the separation roller, and a brake member that is provided in the sheet feeding path in front of the separation roller. A paper feeder comprising a paper feed roller rotationally driven in the sheet feeding direction, and guide members on both sides of the brake member that guide the sheet between the separation roller and the brake member. This is accomplished by a device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a facsimile machine equipped with a paper feeding device according to the present invention. The facsimile apparatus has a document placing table 1 of a paper feeding device in the front part, and the transmission documents placed on the document placing table 1 are fed into the apparatus one by one by the paper feeding device, Information is photoelectrically read when the document passes through a reading section 2 inside the device, and is then discharged from the document discharge port 3 to the outside of the device. The facsimile apparatus also has a recording paper stacker 4 for receiving received documents (recording paper). In FIG. 1, reference numeral 5 is an operation panel for controlling transmission and reception of the facsimile machine, and reference numeral 6 is a continuous automatic paper feeding button of the paper feeding device.

FIG. 2 is a side view showing the drive system of the paper feeding device according to the present invention. In FIG. 2, reference numeral 7 indicates an electric motor. The electric motor 7 has a rotating shaft 8, to which a sprocket 9 is fixed. An endless chain 10 is engaged with the sprocket 9, and this endless chain 10 is connected to the sprocket 9, a sprocket 12 fixedly supported on the roller drive shaft 11, and a shaft 17 fixedly planted on the side plate 28. It is spanned between the idle sprocket 18, which is rotatably supported, and rotates in the direction of the arrow during sheet feeding operation. The reading section 2 is provided with two roller shafts 13 and 14, and each roller shaft is rotationally driven by a drive system of the facsimile body (not shown) via sprockets 15 and 16 fixed to the respective shafts. be done.

The roller shafts 13 and 14 are rollers 19 and 2, respectively.
These rollers 19 and 20 form a pair with rollers 23 and 24 attached to shafts 21 and 22, respectively, and when rotated counterclockwise in the figure, the transmitted document is moved to the right in the figure. It is designed to be transported in both directions. The original to be sent is exposed to the light source 25 while being transported as described above.
The transmission original is irradiated with a light beam emitted by the transmission original, and the light reflected on the original surface of the transmission original is detected by a light receiving element 26, whereby information on the transmission original is read photoelectrically. Further, the reading section 2 includes a photoelectric detector 27 for detecting passage of the transmitted original.
is provided.

3 to 19 show an embodiment of a paper feeder according to the present invention. As clearly shown in FIGS. 3, 8, and 9, the roller drive shaft 11 is connected to side plates 28,
It is rotatably supported by 29. A clutch 30 is provided on the roller drive shaft 11. This clutch 30 is connected to the roller drive shaft 1.
The disk cam 100 rotatably mounted on the drive shaft 11 is rotatably connected to the drive shaft 11,
It is integrated with the disk cam 100. Clutch 30 is
When one end of the lever 33 is engaged with the notch 32 provided in the clutch disk 31, the roller drive shaft 11 and the disk cam 100 are separated,
On the other hand, one end of the lever 33 is connected to the notch 3.
2, the roller drive shaft 11 and the disk cam 100 are connected as described above. The lever 33 is pivotally supported on a shaft 34 and connected at the other end to a plunger 36 of a first solenoid 35. When the first solenoid 35 is energized, the lever 33 is moved by the spring 37.
The spring 37 is rotated clockwise as seen in FIGS. 8 and 9 against the spring force to disengage it from the notch 32, whereas when the current is not energized, the spring 37
flexibly pressing one end of the lever 33 toward the circumferential surface of the clutch disk 31 by a spring force;
This moves it into a state where it can engage with the notch 32.

As clearly shown in FIGS. 3, 13, and 14, the roller drive shaft 11 is connected to the side plates 28, 29.
A sleeve 38 is rotatably supported between them.
A spring clutch 39 is provided between the sleeve 38 and the roller drive shaft 11.
The spring clutch 39 has a clutch sleeve 40 with ratchet teeth 41, and when a pawl 45 provided at one end of a lever 44 is engaged with one of the ratchet teeth 41, the clutch sleeve 40 rotation is prevented and the spring 42 does not wrap around the drive sleeve 43, thereby separating the roller drive shaft 11 and the sleeve 38. In response, the pawl 45 disengages from the engagement with the ratchet teeth, and the clutch sleeve 4
0 is allowed to rotate freely, the spring 42 wraps around the drive sleeve 43, causing the roller drive shaft 11 and the sleeve 3 to
8 are connected to each other in a torque transmission relationship. The lever 44 is pivotally supported on a shaft 46 and connected at the other end to a plunger 48 of a second solenoid 47. When the second solenoid 47 is energized, it drives the lever 44 clockwise as viewed in FIG. 13, disengaging the pawl 45 from engagement with the ratchet teeth 41, whereas when it is not energized, The lever 44 is driven counterclockwise to engage the pawl 45 with one of the ratchet teeth 41.

Further, another sleeve 50 is fitted around the outer periphery of the sleeve 38. A one-way clutch 51 is provided between the sleeves 38 and 50, and this one-way clutch 51 is connected to the sleeve 3.
8, only clockwise rotation as seen in FIG. 13 is transmitted to the sleeve 50, and when the sleeve 38 is at rest, the sleeve 50 is free to rotate in the clockwise direction as seen in FIG. I'm learning to forgive.

As best shown in FIGS. 3, 4, and 6, the sleeve 50 has a plurality of paper feed rollers 52, four in this embodiment, spaced apart from each other in the axial direction. It is held in a fixed state. Each of the paper feed rollers 52 passes through an opening 53 provided in the original document placing table 1, and a part thereof passes through the opening 53 provided in the original document placing table 1.
It protrudes upward in the figure. The paper feed roller 52 may be made of rubber or a rubber-like product.

As shown in FIGS. 3 and 10 to 13, a separation roller drive shaft 54 is provided at a position on the advancing side of the roller drive shaft 11 in the document conveyance direction. The separation roller shaft 54 is rotatably supported by the side plates 28 and 29 below the document placement plate 1, and supports the sleeve 55 in a fixed state. Another sleeve 56 is fitted around the outer periphery of the sleeve 55, and a one-way clutch (not shown) is provided between this sleeve 56 and the sleeve 55. Similar to the one-way clutch 51, this one-way clutch transmits only the rotation of the sleeve 55 in the clockwise direction in FIG.
As seen in the figure, it is designed to allow free rotation in the clockwise direction. A sprocket 57 is integrally formed on the sleeve 55, and an endless chain 59 is stretched between the sprocket 57 and a sprocket 58 attached to the sleeve 38.

As best shown in FIGS. 3, 4, and 5, the sleeve 56 fixes a plurality of separating rollers 60, five in this embodiment, spaced apart from each other in the axial direction. It is being held in good condition. A portion of each of the separating rollers 60 projects upwardly in the drawing of the original placing table 1 through the opening 53 provided in the original placing table 1. The amount of protrusion may be approximately the same as that of the paper feed roller 52, as shown in FIGS. 10 to 12.
Further, the separation roller 60 is made of rubber or a rubber-like product.

Further, on the document mounting table 1, FIGS. 4, 8,
As shown in FIG. 15, a guide member 61 is attached to prevent the transmitted original from entering below the original placing table 1. As shown in FIG.

As shown in FIGS. 3, 5, 8, and 10 to 12, the side plates 28 and 29 rotatably support a shaft 62 above the document table 1. The shaft 62 fixedly supports one end of a yoke-shaped support frame 64 by means of a screw 63.
One end of a polymer of a brake plate 65 and a leaf spring 66 made of a rubber material such as urethane rubber is attached to the other end of the support frame 64, and this polymer is attached to the brake plate at the other end. 65 is in contact with the outer circumferential surface of the separating roller 60, and the other end and the circumferential surface of the separating roller 60 form a wedge-shaped space 6.
7 (see Figure 15). In this embodiment, two brake plates 65 are provided, each in sliding contact with a corresponding separation roller 60. As shown in FIG. 15, a highly slippery layer 68 such as a fluorine resin layer is provided on the surface of the brake plate 65, except for the portion that contacts the separation roller 60. The brake plate 65 is flexibly pressed against the outer peripheral surface of the separating roller 60 by the leaf spring 66, and is also pressed against the outer peripheral surface of the separating roller 60 by a pressing rod 70 supported by a support case 69. It is flexibly pressed towards the surface. Pressing rod 70
is given a downward spring force in the figure by the spring force of a compression coil spring 73 provided between its flange portion 71 and a plug 72 screwed to the support case 69. This breaking force is adjusted by adjusting the screwing amount of the plug 72.

Further, the support frame 64 has a stopper member 74 in front of the brake plate 65, in other words, at a position on the lag side in the document feeding direction. Stopper member 74
are provided on both outer sides of the brake plate 65, and their lower ends are located at the same position as the upper outer circumferential surface of the separation roller 60, or slightly below it, and are placed on the document mounting table 1. It is designed to allow only a few sheets of transmitted originals to pass through. Moreover, the shaft 6
2 has a guide piece 75 that prevents the transmitted original from being rolled up and guides the transmitted original to the reading section 2.

Further, a lever 7 is attached to one end of the shaft 62, as shown in FIGS. 3, 8, and 16 to 19.
6 is installed. The lever 76 has two rotational positions as shown in FIGS. 8 and 18 and a first
It is possible to rotate between the rotational positions as shown in FIG. 6 and FIG. The attached telescopic coil spring 79 allows it to be stably held in the two rotational positions described above. When the lever 76 is in the pivoted position as shown in FIGS. 8 and 18, the support frame 64 is in the operative position as shown, whereas the lever 7
6 is in the pivoted position as shown in FIGS. 16 and 17, the support frame 64 is thrown upwardly into an inactive position. This inactive position is used for cleaning and removing jammed documents. The lever 76 also has an operating knob 80 at one end thereof. Further, the side plate 29 pivotally supports a lever 82 by means of a pin 81, as shown in FIGS. 18 and 19. The lever 82 has a solenoid 83 at one end thereof.
The solenoid 8 is connected to a plunger 84 of the solenoid 8.
When the solenoid 3 is not energized, it is held in a position separated from the lever 76 by the spring force of the telescopic coil spring 85 as shown in FIG. When the operation is performed, the lever rotates by a predetermined angle clockwise as seen in FIG. 19 about the pin 81, about 30 degrees in this embodiment, and the other end touches the operating knob 80 of the lever 76. engaged, said lever 7
6 and rotate the shaft 62 counterclockwise as viewed in FIG. 8 to slightly lift the support frame 64. The solenoid 83 is energized when a paper jam is detected.

Also, Fig. 3, Fig. 8, Fig. 9, Fig. 10 to Fig. 1
As shown in FIG. 2, the side plates 28 and 29 rotatably support a shaft 86 above the document table 1 and at a position on the lag side of the shaft 62 in the document feeding direction. The shaft 86 engages a bracket 88 provided at one end of the presser plate 87 with an elongated hole 89 extending vertically in the figure, and swingably supports the presser plate 87. Further, the shaft 86 supports one end of a drive lever 90 in a fixed state with a screw 91. The other end of the drive lever 90 engages in a hole 93 in an elastic bracket 92 provided near the other end of the holding plate 87. The presser plate 87 faces the paper feed roller 52, and its tip extends to the separation roller 60 and has a comb-like shape. The comb teeth 94 are opposed to the outer circumferential surface of the separation roller 60 on both sides of the brake plate 65 on which the brake plate 65 is not in sliding contact.
(See Figure 5). Further, the comb teeth 95 on both outer sides are located on the outer side of the stopper member 74. Further, the presser plate 87 is provided with a lever member 96 on its lower bottom surface along each of the comb teeth. This rod member 96
are located on both sides of the paper feed roller 52, as shown in FIG. In addition, this rod member 96
may be integrally formed with the holding plate 877 by press-molding the pressure plate 87, as shown in FIG. Further, the presser plate 87 has an inclined plate 97 on the one end side thereof.

The shaft 86 carries one end of a lever 98 at one end thereof, as best seen in FIGS. 3, 8 and 9. The lever 98 has a cam follower 99 at its other end, and the cam follower 99 is pressed against a disc cam 100 attached to the roller drive shaft 11 by the force of a spring 101. The spring 101 is connected to the lever 98.
It is attached between a pin 102 attached to the side plate 28 and a pin 103 attached to the side plate 28.
The lever 33 is located in the notch 32 of the clutch disc 31.
When the cam follower 99 is engaged with the top portion 100a of the Enwa cam 100, as shown in FIG. As shown in the figure. It is held in an upwardly raised position.
On the other hand, when the lever 33 is disengaged from the notch 32 and the disk cam 100 follows the roller drive shaft 11 and rotates clockwise as seen in FIG. Section 100b
9, the shaft 86 is rotated clockwise as viewed in FIG. 9, and the presser plate 87 is lowered to the lowered position as shown in FIG. 11. When the press plate 87 is in the lowered position as shown in FIG. 11, the press plate 87 contacts the upper circumferential surface of the separation roller 60 at the tip of the lever member 96. The disc cam 100 moves the presser plate 87 to the lowered position as described above until the document to be transmitted, which is abutting against the stopper member 74 at its leading edge, is sandwiched between the separation roller 60 and the brake plate 65. It is formed to be lowered. Specifically, the cam edge of the disc cam 100 is
When the height of the documents to be sent is high, the press plate 87 is configured to hold down the document stack for a long time, and when the height of the documents to be sent is low, the press plate 87 is configured to press the document stack for a short time. This short period of time is a period of time during which at least the last sheet of the document to be sent is fed until its leading edge is nipped between the separation roller 60 and the brake plate 65.

The paper feeding device constructed as described above operates as follows. Before operating the continuous automatic paper feed button 6, when setting the transmission document D on the document table 1, the lever 33 engages with the notch 32 of the clutch disc 31, as shown in FIG. However, the cam follower 99 is attached to the top portion 100a of the disc cam 100.
10 and 12 to hold the presser plate 87 in the raised position as shown in FIGS. 10 and 12. Therefore, at this time, a plurality of transmission documents D are passed through between the document placement table 1 and the presser plate 87, and their leading edges are abutted against the stopper member 74, and the document placement table 1 is moved.
It can be placed on top.

When the continuous automatic paper feed button 6 is operated after the setting of the transmission document D as described above is completed, the first and second solenoids 35 and 47 are energized. When the first solenoid 35 is energized, the lever 33 rotates clockwise as viewed in FIG. As a result, the clutch 30 is engaged, and the rotation of the normally rotating roller drive shaft 11 is transmitted to the disc cam 100. As a result, the disk cam 100 rotates clockwise as seen in FIG. 9, and the cam follower 99 moves to the top portion 100a.
It comes to engage with the bottom portion 100b further apart. As a result, the presser plate 87 is momentarily lowered to the lowered position as shown in FIG. At this time, the presser plate 87 is attached to the roller 60 with its comb tooth portion 94.
is pressed toward the upper circumferential surface of the document D, and also presses the transmission document D against the feeding roller 52 at the rear end side. When the number of originals to be transmitted on the original platen 1 decreases, as shown in FIG. The lifting members 96 are positioned between the respective feeding rollers 52 to corrugate the transmitted document to increase its stiffness, and also apply a gentle pressing force to the transmitted document D. Further, as described above, when the second solenoid 47 is energized, the lever 44 rotates clockwise as seen in FIG.
is disengaged from the ratchet teeth 41 provided on the clutch sleeve 40, and the spring clutch 3
9 are connected, and the rotation of the roller drive shaft 11 is transmitted to the sleeve 38. The rotation of the sleeve 38 is transmitted to the paper feed roller 52 via the one-way clutch 51 and the sleeve 50, and also to the sprocket 58, the endless chain 59, and the sprocket 5.
7. Separation roller 60 via sleeves 55, 56
, causing each of these rollers to rotate clockwise as viewed in FIG. The paper feed roller 52 and separation roller 60, which rotate at the same time, are connected to the presser plate 8.
The transmission original D, which is pressed against it by the handle 7, is conveyed to the right as seen in FIG. As a result, the transmitted document D collides with the stopper member 74 as shown in FIG. Board 65
The distal end edge is allowed to enter into a wedge-shaped space 67 defined by. At this time, the leading edge of the transmitted document is prevented from curling upward as shown in the figure by the comb-teeth portion 94 of the presser plate 87, and the leading edge of the transmitted document is properly entered into the deep part of the wedge-shaped space 67. do. Furthermore, even if the leading edge of the transmitted document moves diagonally upward in the wedge-shaped space 67, the leading edge collides with the highly slippery layer 68, and is guided by this to descend downward in the figure, and the edge of the transmitted document also moves diagonally upward in the wedge-shaped space 67. You can now enter the inner part of the screen correctly.

Therefore, among the several sheets of transmission documents that have been fed into the wedge-shaped space 67, all documents other than the lowest transmission document are stopped at that position due to the friction between them and the brake plate 65, and the lowest transmission document As the separation roller 60 rotates, only the paper is conveyed to the right in the figure, and the roller 1 of the reading section 2 shown in FIG.
9 and 23, and is further conveyed to the right in the figure. It should be noted that when the transmitted document collides with the brake plate 65, the brake is applied to the transmitted document to temporarily stop it, albeit for a moment. At this time, if the document to be transmitted is continuously forcibly fed out by the feeding roller 52 with a strong feeding force, wrinkles will occur in the document to be transmitted, especially when there are few documents D to be transmitted on the document tray 1. As shown in FIG. 6, the presser plate 87 lightly presses the original to be sent against the feeding roller 52 in a slightly raised state, so that the feeding roller 52 is forced to send out the original to be sent. Therefore, even if the transmitted document collides with the brake plate and temporarily stops as described above, the transmitted document will not be wrinkled. Further, when the leading edge of the transmission document is caught between the separation roller 60 and the brake plate 65 and is conveyed by the separation roller 60,
The shaft 86 is rotated counterclockwise as viewed in FIG. 9 by the continuously rotating disc cam 100, and the retaining plate 87 is moved from the lowered position as shown in FIG. 11 to the position shown in FIG. The document to be sent will be raised to the raised position as shown in FIG.
This will release the pressure towards the object.
In this embodiment, the presser plate 87 in the lowered position is lifted in the following manner. That is, when the shaft 86 rotates counterclockwise as seen in FIG. 11, the lever 90 rotates accordingly, and the entire presser plate 87 rotates counterclockwise around the shaft 86. They are lifted apart by separation rollers 60. The tip of the presser plate 87 is attached to the frame 64.
When it comes into contact with the lower end edge of the presser plate 87, the presser plate 87 rotates clockwise as seen in FIG. It becomes as if it were lifted horizontally upwards.

The leading edge of the separated transmission document passes through the detector 27 of the reading unit, and when it is detected by the detector 27, the rollers 19 and 20 (see FIG. 2)
The drive to is stopped, and the original to be transmitted is therefore temporarily stopped at that position. Also, at this time, energization to the first and second solenoids 35 and 47 is also stopped. Therefore, the lever 44 rotates counterclockwise as seen in FIG.
0 engages with one of the ratchet teeth 41, and the spring clutch 39 is disengaged. Also lever 33
rotates counterclockwise as viewed in FIG. When the preparations on the receiving side of the facsimile machine are completed, the drive stoppage of the rollers 19 and 20 is released and they again rotate counterclockwise as viewed in FIG. As a result, rollers 19 and 20
rotate to convey the transmission document to the right in the figure. At this time, the information of the transmitted document is photoelectrically read by the light source 25 and the light receiving element 26. Incidentally, at this time, the feeding roller 52 and the separating roller 60 rotate freely as the original to be transmitted is carried out. Further, the lever 33 engages with the notch 32 of the clutch disc 31, thereby disengaging the clutch 30 and stopping the rotation of the disc cam 100. As a result, the cam follower 99 is again connected to the top portion 10 of the disc cam 100, as shown in FIG.
0a, and the presser plate 87 is moved to the 10th position.
It is adapted to be held in the raised position as shown in FIGS.

Then, the rear end of the transmitted document passes through the detector 27, and when it is detected by the detector 27, the first and second solenoids 35 and 47 are energized again, and from then on, the document mounting table 1 The above-described operation is repeated until all of the above transmission originals are fed.

As described above, according to the present invention in which the guide members are provided on both sides of the brake member and guide the fed sheet between the brake member and the separation roller, even if the sheet is curled, Even if there is a paper jam, the leading end of the paper is guided between the brake member and the separation roller, so that the paper can be reliably separated and fed without jamming.

In the above description, the present invention has been described with reference to specific embodiments, but the present invention is not limited thereto, and those skilled in the art will recognize that various embodiments are possible within the scope of the present invention. It would be obvious to

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of a facsimile device equipped with a paper feeding device according to the present invention, FIG. 2 is a schematic side view showing the paper feeding device and the drive system of the facsimile device, and FIG. A plan view showing the main parts of one embodiment of the paper feeding device (this third
4 is a plan view showing the roller arrangement portion; FIGS. 5 and 6 are sectional views taken along lines - and - in FIG. 3, respectively; FIG. 7 is a sectional view corresponding to the sectional view taken along the line - in FIG. 3 showing another embodiment of the presser plate, and FIG. FIGS. 9 and 10 are sectional views taken along the lines - and - of FIG. 3, respectively. FIG. 11 is a sectional view showing another state of the part shown in FIG. Figure, Figure 13, 1st
Figure 4 corresponds to the lines XII-XII, -, in Figure 3, respectively.
15 is an enlarged vertical sectional view showing the separation roller, brake plate, and stopper member;
FIG. 16 is a sectional view corresponding to the sectional view taken along the line - in FIG. 3 showing the state during cleaning, and FIG. 17 is a perspective view of the main parts showing the state during disassembly and cleaning.
18 and 19 are left side views of FIG. 3. DESCRIPTION OF SYMBOLS 1... Document placement table, 2... Reading unit, 7... Electric motor, 11... Roller drive shaft, 30... Clutch, 39... Spring latch, 52... Feeding roller, 60... Separation roller, 65 ... Brake plate, 74 ... Stopper member, 87 ... Holding plate, 8
6... Shaft, 94... Comb teeth as a guide member, 98
...Lever, 99...Cam follower, 100...
disc cam.

Claims (1)

[Scope of Claims] 1. A separation roller 60 that is rotationally driven in the sheet feeding direction, a brake member 65 that contacts the circumferential surface of the separation roller 60, and a sheet feeding path in front of the separation roller 60. a paper feed roller 52 that is provided and feeds the sheet between the separation roller 60 and the brake member 65; A paper feeder comprising a guide member 94 that guides the sheet fed by the paper feed roller 52 between the brake member 65 and the separation roller 60.