JPH06316354A - Sheet feeding device - Google Patents

Abstract

PURPOSE:To cause the tip of a paper sheet to stop in a given position with high precision by a method wherein the tip of a paper sheet under a feed is brought into butt against the nip part of a reversed conveyance rotary body and after a feed rotary body is rotated as it is slipped over the sheet, the conveyance rotary body is rotated forward. CONSTITUTION:When a motor is driven according to a sheet feed command and a feed roller 6 is rotated through a gear train, the topmost paper sheet of paper sheets P on a sheet placing table 4 is fed to a gap between a sheet press roller 8 and a separation plate 9. The paper sheets P are separated one by one in coordination of the feed roller 6 with a separation sheet 11 and fed to an engaging part (a nip part) between a main roller 13, rotated in a reverse direction to a sheet feed direction, and a main pinch roller 16. Since the paper sheer P fed to the nip part is not moved forward any more, the feed roller 6 is rotated as it is slipped over a paper sheet surface in a state to bend the paper sheet P and stopped in a given position. Thereafter, the rollers 13 and 16 are rotated forward and the paper sheet P is fed frontward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printer, a typewriter, a copying machine, a facsimile, and the like, which feeds a plurality of sheets of paper one by one to a recording section or a reading section. The present invention relates to a device for feeding a bent sheet in a direction perpendicular to the generatrix of the main roller without bending.

[0002]

2. Description of the Related Art A sheet feeding device of this type has a function of surely separating a plurality of sheets one by one, a function of conveying the separated sheets in a direction perpendicular to a generatrix of a main roller, and a predetermined sheet of paper. There is a demand for a function of accurately transporting to the position. In recent years, it has been required to feed various types of paper such as thin paper, cardboard, postcards, envelopes, and resin films with the same device.

Japanese Patent Publication No. 58-6633 is a technique for solving a part of the above functions. With this technology, the driving force of the printing cylinder is transmitted to the separating roller of the paper feeding device through the one-way clutch, and when the printing cylinder reverses, the separating roller rotates in the paper feeding direction, so that the paper enters the entrance of the printing cylinder. After reaching, it is curved into an arc by further feeding of the separation roller. Next, when the print cylinder rotates in the forward direction, the paper is drawn into the print cylinder by the force of the bent paper and is then sent to a predetermined position. The above-mentioned technique has a drawback that it cannot be used for paper that is difficult to bend, such as postcards and envelopes.

Next, in the technique disclosed in Japanese Patent Publication No. 62-3826, the paper fed from the pickup roller of the feeding device to the drive roller is fed backward until it passes through the meshing portion of the drive roller. A method is proposed in which the front end of the paper is brought into contact with the meshing portion of the drive roller by bending the paper between the pickup roller and the drive roller, and then the drive roller is normally rotated to feed the paper. However, this technique is also a postcard,
It had the drawback that it could not be used on paper that is difficult to bend, such as envelopes.

[0005]

Since the object of the present invention is to use only flexible paper in the prior art, it is possible to use various types of thin cardboard, postcards, envelopes, resin films, etc., except for the drawback that the type of paper is limited. Paper feed that separates multiple types of paper for each type, passes the main roller with the front edge of the separated paper along the generatrix of the main roller, and then conveys it to a predetermined position with high accuracy. To provide a device.

Still another object of the present invention is to provide an extremely small-sized sheet feeding apparatus by reducing the large space and the long conveying path required for folding the sheet in the prior art. is there.

[0007]

The structure of the present invention for attaining the above-mentioned object is a feed rotary member for feeding a sheet in a predetermined direction, and a forward / reverse rotatable member. A pair of conveyance rotators that nip the sheet fed by the feeding rotator and convey the sheet in the predetermined direction, and the feeding rotator are rotated to feed the sheet in the predetermined direction, and the tip of the sheet is rotated in the reverse direction. The feeding rotating body is abutted against the nip portion of the conveying rotating body, and after the abutting, the feeding rotating body is rotated while sliding on the sheet to continuously apply the feeding force in a predetermined direction. And a control unit for rotating the sheet in the forward direction.

According to the present invention, the sheet is sent to the main roller pair without being bent by the feeding roller, and the sheet is further fed by the feeding roller in the direction perpendicular to the main roller generatrix, followed by the main roller. As a result, it is possible to feed even paper that is difficult to bend because it is conveyed to a predetermined position.

As described above, since it is not necessary to provide a large space for bending the sheet and a long conveying path while the sheet is being fed from the feeding roller to the main roller, the feeding roller and the main roller are separated from each other. It became possible to install them very close together, which made it possible to make the device extremely small.

Further, a part of the transmitting portion is composed of a sun gear and a planetary gear that revolves while meshing with the sun gear, and does not affect the sheet feeding operation within the non-interlocking process area due to the revolution. The ink suction pump can be operated by rotating the motor forward and backward, so that one motor can be used as a power source for a plurality of mechanisms having different functions without providing a discontinuous process by a special member. This makes it possible to provide a device with low manufacturing cost.

[0011]

1 and 2 show a first embodiment in which the present invention is applied to an ink jet printer, FIG. 1 is a schematic view showing the mechanism of the present apparatus, and FIG. 2 is a sectional view of the present apparatus.

In FIG. 2, a cover 1 is provided on the outside of the main body of the apparatus.
And a lid 2 rotatable about a shaft 2a. The lid 2 also serves as a paper tray. The sheet is inserted through the insertion opening 1a provided in the cover 1 and ejected through the ejection opening 1b. Inside the plurality of side plates 3 provided in the cover 1, the sheet loading table 4, which is urged to rise in the direction of the feeding roller 6 by a spring 5 around a shaft 4a, can come into contact with the sheet. A feeding roller 6 having a long diameter portion and a short diameter portion that does not come into contact with a sheet and fixed to a shaft 7, and a rotation roller provided on the shaft 7 so as to be shorter and shorter than the long diameter portion of the feeding roller 6. A paper pressing roller 8 having a longer radius, and a separating pad 11 having a high friction characteristic on the surface by a spring 10 around a shaft 9a.
Separation plate 9 that is in pressure contact with the long diameter portion of the feeding roller 6 and the paper pressing roller 8 via a shaft, and is fixed to the shaft 12 and is guided by the feeding roller 6 by an upper paper guide 28a and a lower paper guide 71. A main roller 13 that conveys the fed sheet at a constant speed, a first pinch roller 16 that is rotatably provided on a shaft 14 and presses the sheet against the main roller by the force of a spring 15 via the shaft 14. Ink absorber 1
A platen 18 having a built-in 7; a paper discharge roller 20 fixed to a shaft 19 for discharging printed paper; and a shaft 21 rotatably provided on the shaft 21 by the force of a spring 22 to discharge the paper. A second pinch roller 23 that presses against
A carriage 26 which is guided by the guide shafts 24 and 25 and is movable in the width direction of the paper, and a recording head 27 which is mounted on this carriage and ejects ink from an ejection unit 27a in accordance with image information to perform printing. It has and.

The carriage 26 has a paper guide 28a.
A motor 29 provided on a central side plate 28 having a drive shaft, a pulley 30 provided on an output shaft of the motor 29, and one end of the carriage 2
It is driven by a belt 31 fixed to 6 and attached to the pulley 30.

Further, an operation electric board 33 having a plurality of switch buttons 32 protruding from the holes of the case 1 and a microcomputer and a memory are mounted inside the case 1 to control the operation of the apparatus. A control electric board 34 is provided.

The mechanism of the apparatus will be further described with reference to FIG. A plurality of auxiliary feeding rollers 35 having long and short radii and fixed to the shaft 7 are provided to the feeding rollers 6 over the width of the sheet.
Cooperate with to feed the form.

The cam plate 36 fixed to the shaft 7 and the paper tray 4
The convex portion 4C of the guide portion 4b provided on the base plate 4a is always in contact with the convex portion 4C by the force of the spring 5, and the cam plate 36 also rotates in synchronization with the paper feed rotation of the feeding roller 6 and As a result, the paper table 4 moves up and down. Main roller shaft 1
Since the pulley 37 provided at one end of 2 and the pulley 38 provided at one end of the paper discharge roller shaft 19 are connected by the belt 39, the rotation of the motor M is transmitted to the roller 20 via the shaft 12. .

A cap base 41 on which a cap 40 for covering the ink ejection portion 27a of the recording head 27 is arranged.
Has a rotating shaft 41a and a push-down cam portion 41b,
Since the rotation of the carriage 26 is urged in the counterclockwise direction about the shaft 41a by the force of the spring 42, the protrusion 26a of the carriage 26 is moved by the movement of the carriage 26 so that the pushing-down cam 4 is pushed.
When it comes into contact with 1b, the cap base 41 is pushed down against the force of the spring 42, so that the cap 40 also falls and when the protrusion 26a passes the push-down cam 41b, the cap 4 is pushed.
0 rises and comes into close contact with the discharge part 27a to cover the discharge port.

The pump 43 has a piston shaft 43b forming a rack 43a, a suction port 43c, and a discharge port 43d. The suction port 43c and the cap 40 are formed by a tube 40a, while the discharge port 43b is formed by a platen base 18. And the tube 44 are connected to each other, and the ink flowing from the cap 40 is discharged to the absorbing member 17 in the platen base 18.

The pump drive gear 45 is provided on the shaft 12 so as to be movable in the direction along the shaft center of the shaft 12 and interlocked with the rotation of the one shaft 12, and is constantly operated by a spring 46. It is located where it does not mesh with the rack 43a. Solid components of the ink are likely to adhere to the vicinity of the ejection port of the recording head 27, which may cause ejection failure. At this time, in order to perform the ejection failure recovery operation, the motor 29 moves the carriage 26 in accordance with a command from the controller 34 to couple the ejection portion 27a with the cap 40. By the movement of the carriage 26, the protrusion 26b of the carriage 26 moves the pump drive gear 45 to the position shown by the two-point lacing line, so that the gear 45 meshes with the rack 43a. When the gear M 45 is repeatedly rotated forward and backward within a predetermined rotation angle a predetermined number of times by driving the motor M in the above state, the rack 43 is rotated.
a performs reciprocating movement in the straight direction a predetermined number of times. Since the piston reciprocates in conjunction with the piston shaft 43b, the pump 4
Reference numeral 3 denotes the absorbing member 1 in the platen table 18 which absorbs the ink and its solid content from the projecting portion 27 a and further sucks the ink.
Discharge to 7.

The motor M rotates the main roller pair 13 via the output gear 47, the two-step gear 48, and the main roller gear 49 fixed to the shaft 12 in response to a signal from the controller 34 to convey the paper.

On the other hand, the motor M rotates the shaft 51 via the output gear 47, the two-stage gear 50 and the gear 52 fixed to the shaft 51. A first carrier 55 that axially supports a first planetary gear 54 that meshes with a sun gear 53 fixed to a shaft 51.
Similarly to the above, the second carrier 57, which supports the second planetary gear 56, is rotatably provided on the shaft 51, and the carrier is spring 5 so as to follow the rotation of the sun gear 53.
It is pressed against the side surface of the sun gear 53 by 8. When the shaft 51 rotates in the direction of arrow 59 by the rotation of the motor M in the direction in which the main roller 13 feeds the paper in the forward direction, the first planetary gear 54 is driven by the sun gear 53, and the first planetary gear 54 is the internal gear. While engaging with 60, it rotates and revolves, and when it is out of mesh with the internal gear 60, the pin 55a hits the pin 61 and stops its revolution.

When the shaft 51 rotates in the direction of arrow 62 by the rotation of the main roller 13 of the motor M in the direction for feeding the paper backward, the first planetary gear 54 rotates and revolves in the direction of arrow 62.
When the gear 63 comes out of the engagement with the internal gear 60, the gear 63
Mesh with. When the motor M further continues to rotate in the direction of the arrow 62 in the above state, the sun gear 63 rotates the toothless gear 64 fixed to the shaft 7 through the first planetary gear 54 and the gear 63 and having the toothless portion 64a. Then, the tooth-chipped gear 64 transmits the rotation in the feeding direction to the paper feed roller 6 via the shaft 7.
When the rotation of the tooth-chipped gear 64 progresses and the tooth-chipped portion 64a reaches the meshing position with the gear 63, the gear 63 idles and is not transmitted to the tooth-chipped gear 64. Then, the rotation of the paper feed roller 6 is stopped.

When the shaft 51 rotates in the direction of arrow 62, the second
The planetary gear 56 revolves in the same direction, and when the pin 57a implanted in the carrier 57 hits the pin 65, the revolution stops. After the above state, when the shaft 51 rotates in the direction of the arrow 59, the second planetary gear 56 revolves in the same direction and meshes with the toothless gear 64, and the sun gear 64 continues to move to the second planetary gear 56 and The rotation in the sheet feeding direction is transmitted to the sheet feeding roller 6 via the toothless gear 64. When the rotation of the tooth-chipped gear 64 progresses and the tooth-chipped gear 64a reaches a position where it meshes with the second planetary gear 56, the second planetary gear 56 idles and transmission to the tooth-chipped gear 64 is not performed. Therefore, the toothless gear 64
Then, the rotation of the feeding roller 6 is stopped.

Next, another embodiment of the transmitting portion will be described with reference to FIGS. 1 and 3. In FIG. 3, the same members as those in FIG. 1 are denoted by the same numbers as those in FIG. In FIG. 3, a gear 66 having the same shape as the sun gear 53 of FIG. 1 is fixed to an end of the shaft 51 facing the sun gear 53, and the first planetary gear 54 that revolves while meshing with the gear 66 is a carrier. It is rotatably supported by 55. Since the carrier 55 is pressed against the side surface of the gear 66 by the spring 67, the carrier 55 follows the rotation of the gear 66 and rotates in the same direction. Further, a gear 68 having the same shape as that of the gear 63 of FIG. 1 is fixed to opposite ends of the shaft 69, and when the first planetary gear 54 drives the gear 68, the gear 63 also rotates together. Here, as a design example in FIG. 1, the reduction ratio of the gear transmission unit from the motor M to the main roller shaft 12 and the reduction ratio of the gear transmission unit from the motor M to the shaft 51 are designed to be the same value, and the pump drive gear is further used. 45 is 2
If the pump 43 is driven by forward / reverse rotation of 50 °, the first planetary gear 54 has the pin 55a and the pin 61 because the feed roller 6 is not driven by the rotation of the shaft 51 in the direction of the arrow 62 in FIG. The non-interlocking process area 70 from the contacting position to the position where the gear 68 is meshed is set to 250.
It is necessary to set the angle at or above, for example, the non-interlocking process area 70 becomes 280 ° with a margin. Therefore, in order to increase the revolution angle of the first planetary gear 54, the structure of FIG. 3 has two sun gears to secure the non-interlocking process area. On the other hand, when the pump 43 operates, the rotation of the arrow 59 of the shaft 51 does not transmit the rotation to the toothless gear 64 because the second planetary gear 56 always idles due to the toothless portion 64a, so that the feeding roller 6 does not rotate.
Is not driven.

The configuration of the gear transmission portion in FIG. 3 requires a large space because the revolving angle of the first planetary teeth 54 is large, and the number of gears and shafts is large. There was a problem.

The gear transmission section shown in FIG. 1 solves the above problem by using an internal gear.

The internal gear will be described based on a design example of the internal gear 60 in FIG. Number of teeth of the sun gear 53 Z ₁ = 1
8, the module M ₁ = 0.6, the number of teeth of the first planetary gear 54 Z ₂ = 10, and the module M ₂ = 0.6, the specification of the internal gear 60 is the number of teeth of the internal gear 60 Z ₃ = 38, the module M ₃ = 0.6. On the other hand, rotating the sun gear 54 by 280 ° means that the sun gear 53 rotates by 14 teeth.

When the sun gear 54 rotates 14 teeth, the first planetary gear 54 rotates while meshing with the internal gear 60, and revolves for 14 teeth by the number of teeth of the internal gear 60.

The 14 teeth of the internal tooth 60 are approximately 1 when angled.
It becomes 33 °, and the revolution angle can be made smaller than that of the example in FIG. 3, and as a result, it is possible to arrange a plurality of planetary gears around one sun gear, and the transmission unit can be miniaturized. . Further, since the revolving operation of the first planetary gear 54 is carried out while meshing with the fixed internal gear 60, slipping or the like does not occur and a reliable operation can be obtained.

Other than the above design, the revolution angle can be further reduced depending on the combination of the number of teeth of the sun gear and the planetary gear.

Next, the feeding operation in the first embodiment will be described with reference to FIGS. 1, 2 and 4 to 8. Figure 4
8 is a sectional view showing the main members for feeding the paper in FIG. In the figure, the same members as those shown in FIG. 1 are designated by the same reference numerals.

In FIG. 4, an upper guide 28a which is provided at the tip of the inner side plate 28 to fill the paper width and a lower guide 71 which is also provided to fill the paper width feed the paper P fed by the feeding roller 6. This is for guiding the sheet to the meshing portion of the main roller 13 and the main pinch roller 16 without bending, and the gap between the upper guide 28 and the lower guide 71 becomes narrower as it approaches the meshing portion. FIG. 4 shows the state before the start of the feeding operation, with the paper tray 4 in the lowered position,
The pin 55a and the pin 61 are in contact with each other, the second planetary gear 56 and the toothless portion 64a of the toothless gear 64 are out of mesh with each other, and the separation pad 11 is in contact with the sheet pressing roller 8 and the feeding roller. 6 is at the illustrated position, and the paper table 4 is
A plurality of sheets P are stacked on the sheet.

When the motor M shown in FIG. 1 rotates the shaft 51 in the direction of arrow 62 according to a command from the controller 34 shown in FIG. 2, the first planetary gear 54 rotates while meshing with the internal gear 60 and further the sun gear 53. Revolves around and meshes with the gear 63, resulting in the state shown in FIG.

In FIG. 5, the feeding roller 6 which is rotated in the feeding direction by the sun gear 53, the first planetary gear 54, the gear 63, and the toothless gear 64 moves the plurality of sheets of paper P by raising the sheet loading table 4. The upper sheet is moved to the gap formed by the sheet pressing roller 8 and the separating plate 9. On the other hand, the second planetary gear 56 also has an arrow 6
It revolves in two directions, and stops when the pin 57a hits the pin 65. Due to the revolution, the second planetary gear 56 is disengaged from the mesh with the toothless gear 64.

FIG. 6 shows a state in which the feeding roller 6 is further rotated in the feeding direction by the subsequent rotation of the shaft 51 in the direction of the arrow 62. The feeding roller 46 and the separating sheet 11 cooperate with each other. The sheets are separated sheet by sheet, and the leading end of the sheet P is driven to rotate in the opposite direction to the feeding direction by the rotation of the sheet feeding roller 64. The meshing portion (nip portion) between the main roller 13 and the main pinch roller 16 is driven. ) Will be sent to. Since the sheet sent to the meshing portion does not further advance, the feeding roller 64 rotates while slipping on the upper surface of the sheet P without bending the sheet P. Said slip is achieved by the proper pressure of springs 5 and 10. Next, when the toothless portion 64a reaches the position where it meshes with the gear 63, the gear 63 idles, so that the drive transmission of the motor M to the feeding roller 6 is cut off, and the rotation of the feeding roller 6 is stopped. . If the paper is bent in the state where the feeding roller is stopped, the paper may reverse the feeding roller and the stop may not be performed completely.Therefore, it is necessary to feed the paper without bending it. There is. Since the sheet mounting table 4 is lowered during the rotation of the tooth-chipped gear 64, the sheet is pressed against the feeding roller 64 by the rising force of the table 4 and the feeding roller 64 is moved.
Does not pull out the next sheet.

FIG. 7 shows a state in which the shaft 51 moves in the direction of the arrow 59 shown in FIG. 2 by the rotation of the main roller 13 of the motor M in the direction of forward feeding of the paper, and the second planetary gear 56 shows the arrow. It revolves in the 59 direction and meshes with the toothless gear 64. Due to the meshing, the feeding roller 6 is rotated in the feeding direction by the sun gear 53, the second planetary gear 56, and the toothless gear 64. The rotated feeding roller 6 allows the sheet P to pass through the meshing portion of the main roller 13 and the main pinch roller 16. During the passage of the sheet P, the main roller 13 is rotating in the direction in which the sheet is normally fed.

FIG. 8 shows the state in which the feeding roller 6 is finally rotated by the subsequent rotation of the shaft 51 in the direction of the arrow 59. The rotation of the tooth-chipped gear 64 causes the tooth-chipped portion 64a to move to the second toothed portion 64a. When the meshing position with the planetary gear 56 is reached, the meshing between the second planetary gear 56 and the toothless gear 64 is cut off, and the second planetary gear 56 runs idle, so the drive transmission of the motor M to the feeding roller 6 is cut off. Therefore, the feeding roller stops rotating while the feeding roller is separated from the surface of the paper P, but the main roller 13 does not rotate.
Is conveyed to a predetermined position. During the conveyance, the paper pressing roller 8 rotates following the paper. Following the continuous rotation of the sun gear 53 in the direction of arrow 59, the second planetary gear 54 revolves while meshing with the internal gear 60, and the pin 55 moves.
The revolution stops when a contacts the pin 61. As a subsequent operation, as shown in FIG. 2, the motor M feeds the paper P conveyed between the predetermined positions in the forward direction by a predetermined amount based on the print signal of the controller 34, and the carriage 26 reciprocates in the paper width direction. During the reciprocating movement, ink is ejected from the ejection portion 27a of the head 27 to perform printing.
The paper P on which printing has been completed is discharged by the discharge roller 20 to the discharge port 1
It is discharged from b. As described in detail above, in the transmission portion of the present device, the amount of rotation required by the motor M in the direction of the arrow 62 is the amount by which the first planetary gear 54 revolves, and the toothless gear 6
4 is the amount by which the toothless portion 64a of No. 4 rotates to the meshing position with the gear 63, while the rotation amount in the direction of arrow 59 is the amount by which the second planetary gear 56 revolves and the toothless portion of the toothless gear 64. 64a is added to the amount of rotation to the meshing position with the second planetary gear 56 and the amount of idle rotation of the second planetary gear 56. The motor can be set by appropriately setting the amount of idle rotation in any rotation direction. The rotational position of the feeding roller 6 can be controlled with high accuracy by the toothless portion 64a without performing highly accurate rotation control by M.

Next, the operation of the paper tray 4 in the first embodiment will be described with reference to FIGS. 1, 2 and 9 to 11.

9 to 11 show the paper tray 4 in FIG.
FIG. 9 is a cross-sectional view showing a main part member related to the operation of FIG.

In FIG. 9, the leading end 4d of the sheet mounting table 4 which is rotatably provided around the shaft 4a is always given a rising force by a spring 5. The guide portion 4 by the ascending force
The convex portion 4c of b is the concave portion 36 of the cam plate 36 fixed to the shaft 7.
The rotation of the cam plate 36 is prevented in the state of falling to a. At the position where the convex portion 4c and the concave portion 36b mesh with each other, the cam plate 36 keeps the paper tray 4 in the lowered position.

In FIG. 10, when the feeding roller 6 rotates in the feeding direction, the cam plate 36 also rotates through the shaft 7 in synchronization with the rotation of the feeding roller 6, so that the convex portion 4c is cammed. From the maximum lift surface 36b of the plate 36, the force of the spring 5 causes the tip portion 4d of the sheet loading table 4 to rise until it contacts the major radius surface of the feeding roller 6. In the above state, the paper table 4
The sheets stacked on the sheet are pressed against the long radius surface of the feeding roller 6, and the sheet is fed by the rotation of the feeding roller 6.

In FIG. 11, when the cam plate 36 further rotates in synchronization with the subsequent rotation of the feeding roller 6 in the feeding direction, the cam surface 36c of the cam plate 36 pushes the convex portion 4c,
Then, the maximum lift surface 36b continues to push the convex portion, and finally, as shown in FIG.
-Return to state A. In this state, since the end 4d is separated from the major radius surface of the feeding roller 6, the feeding roller 6 does not move the sheet at this position, but the spring 15 causes the feeding roller 6 to move to the feeding roller via the separating pad 11. The pressed sheet is moved by the rotation of the feeding roller 6.

Next, another sheet platform driving mechanism will be described with reference to FIGS. 1, 2 and 12 to 14. 12 to 14, the same members as those in FIG. 1 are denoted by the same reference numerals. 12
, The cam plate 72 having the convex portion 72a and the gear 73 are both fixed to the shaft 74, and the gear 73 is the gear 75.
It is rotated by a gear 76 fixed to the shaft 7 via. Since the gear 73 and the gear 76 have the same number of teeth, therefore, when the feeding roller 6 makes one rotation, the cam plate 72 also makes one rotation in synchronization. A concave portion 77b is provided on a side portion 77a of the paper table 77, and the convex portion 72a and the concave portion 77b of the cam plate 72 are provided at the posture position of the feeding roller shown in FIG.
Are engaged.

In the above state, the end 7 of the paper tray 77 is
7c has fallen to the bottom. In the above configuration, the engagement position between the cam plate 72 and the paper tray 77 can be selected by selecting the number of the gears 75 that drive the cam plate 72, so that the degree of freedom in design is increased.

In FIG. 13, when the cam plate 72 also rotates in synchronism with the rotation of the feeding roller 6, the convex portion 72a moves to the sheet loading table 7.
7 is displaced from the upper surface of the side portion 77a of the sheet 7, the sheet mounting table 77 is lifted by the spring 5, and the end portion 77c is pressed against the long radius surface of the feeding roller 6.

In FIG. 14, the maximum lift surface 72b of the cam plate 72 pushes down the upper surface of the side portion 77a by rotating the cam plate 72 in synchronization with the subsequent rotation of the feeding roller 6, The paper table 77 descends. Feeding roller 6
The further rotation of returns to the state shown in FIG.

Next, a second embodiment will be described with reference to FIGS. 1, 2 and 15. FIG. 15 is a cross-sectional view of the present apparatus of the second embodiment. In FIG. 15, the same members as those shown in FIGS. 1 and 2 are given the same numbers.

In the first embodiment, the method of separating a plurality of sheets of paper one by one is a method of separating the plurality of sheets of paper by shifting the leading ends of the plurality of sheets of paper by the separating pad and the feeding roller.
In the embodiment, a so-called abutment separation method is used in which thin paper is separated by a corner claw and thick paper such as a postcard or an envelope is abutted against a slope.

In FIG. 15, a rotary shaft 7 is attached to a side plate 78b provided on a side portion of a paper tray 78 supported by a shaft 78a.
A claw member 80 having a claw portion 80a pivotally supported by 9 is attached. The pawl member 80 is constantly urged by a spring 81 to rotate in a direction of approaching the paper tray 78.

Switching lever 8 pivotally supported by a shaft 82
Reference numeral 3 switches the separation method between the claw method and the abutting method, and the tip end 83a of the lever 83 is engaged with a hook portion 80b provided on the claw member 80. When the lever 83 is tilted in the clockwise direction, the claw 80b and the sheet tray 78 are opened, and the sheet can be inserted below the claw 80a.
The inserted sheet can be separated by the claw portion 80a.

When the lever 83 is tilted counterclockwise, the spring 81
By this action, the claw portion 80a enters the concave portion 78c provided at the front end of the sheet loading table 78, so that the sheets can be stacked above the claw portion 80a, and the sheets stacked on the claw portion 80a can be stored in the slope member 84. The leading edge of the sheet can be abutted against the inclined surface portion 84a to be separated. A feeding roller 6 having a long radius and a short radius is fixed to a shaft 7, and the feeding roller feeds a sheet toward the main roller 13 by rotating twice. The main roller 13 and the main pinch roller 16 nip the fed sheet and feed the sheet to a predetermined position. Subsequent configurations and element members are the same as those already described with reference to FIG.

Next, the transmission section in the second embodiment will be described with reference to FIGS. FIG. 16 is a partial schematic view showing the transmission portion and its peripheral members in the second embodiment.
The same members as those in FIG.

In FIG. 16, when the shaft 51 rotates in the direction of arrow 59 driven by the motor M through the gears 50 and 52, the first planetary gear 54 revolves in the direction of arrow 59 and the pin 55a abuts the pin 61. At that point, the revolution stops.

On the other hand, the second planetary gear 56 revolves in the same direction to rotate the tooth-chipped gear 64 in the direction of arrow 59 while meshing with the tooth-chipped gear 64 fixed to the shaft 85. When the toothless portion 64a comes to the meshing position by the rotation, the second planetary gear 56 idles and cuts off the transmission to the toothless gear 64. Next, when the shaft 51 is rotated by the motor M in the direction of the arrow 62, the first planetary gear 54 revolves in the direction of the arrow 62 while rotating by rotating with the inner gear 60, and finally the gear 6 is rotated.
The tooth-chipped gear 64 is rotated in the direction of arrow 59 while meshing with 3. The rotation of the tooth-chipped gear 64 is performed by a gear 86 fixed to the shaft 85, a gear 88 fixed to the shaft 87, a gear 89 fixed to the shaft 87, and a gear 90 fixed to the shaft 7. It is transmitted to the feeding roller 6 by transmission. The gear 86 and the gear 88 are set to have the same number of teeth, and the gear 89 is set to have the number of teeth twice that of the gear 90. It rotates twice in the feeding direction.

The cam plate 72 fixed to the shaft 72, which operates in the same manner as shown in FIGS. 12 to 14, passes through the gear 73, the gear 75, and the gear 90, which are also fixed to the shaft 74, to rotate the tooth-missing gear 64. Motion is transmitted. Since the number of teeth of the gear 73 is set to be twice that of the gear 90, when the feeding roller 6 makes two rotations, the cam plate 72 makes one rotation in the direction of arrow 59 and returns to the original position.

Next, the operation of feeding a sheet in the second embodiment will be described with reference to FIGS.

In FIG. 15, when the switching lever 83 is rotated in the clockwise direction, the claw 80a is separated from the surface of the sheet mounting table 78, and a plurality of sheets are inserted between the separated portions. On the other hand, for thick paper, the lever 83 is rotated counterclockwise for use.

In FIG. 16, when a signal from the controller 34 causes the main roller 13 of the motor M to rotate in the direction for feeding the paper backward, the gear 52 rotates via the gear 50 in the direction of arrow 62. From the position where the pin 55a of the carrier 55 and the pin 61 fixed to the side plate are in contact with each other, the planetary gear 54 is indicated by the arrow 62.
It meshes with the gear 63 through a non-interlocking process of a predetermined angle by revolving in the direction. By the rotation of the gear 63, the toothless gear 64 also rotates in the direction of arrow 59. The rotation of the gear 64 is transmitted to the feeding roller 6 through the gear 86, the gear 88, the gear 89, and the gear 90, and the feeding roller 6 rotates in the sheet feeding direction.

On the other hand, when the cam plate 72 is rotated in the direction of the arrow 59 through the gear 90, the gear 75, and the gear 73, the convex portion 72a and the concave portion 77b of the mounting base 77 are disengaged from each other, and the mounting base 77 is raised. The platform 77 causes the uppermost surface of the plurality of placed sheets to contact the feeding roller 6.

When the feeding roller 6 moves the uppermost sheet by the abutment, the leading end of the sheet rides over the claw portion 80a in FIG. 7, and then the feeding roller 6 is rotated so that the leading end of the sheet becomes the main roller 13. The sheet is fed to a position where it meshes with the main pinch roller 16.

When the tooth-chipped portion 64a of the tooth-chipped gear 64 reaches the meshing portion with the gear 63 during the plurality of rotations of the feeding roller 6, the gear 63 idles and the transmission is cut off. The rotation is stopped and the feeding roller 6 is also stopped.

Next, when the motor M rotates in the direction in which the main roller 13 feeds the paper in the forward direction, the sun gear 53 rotates in the direction of arrow 59, and following the rotation, the first planetary gear 54 rotates the gear 63.
Revolves away from the position where it meshes with. On the other hand, when the pin 57a and the pin 65 of the carrier 58 are in the contact state position, the second planetary gear 56 revolves in the direction of the arrow 59 and meshes with the toothless gear 64, and the base 2 planetary gear 56 is the toothless gear. 64 is rotated in the direction of arrow 59.

By the rotation, the feeding roller 6 also rotates in the feeding direction to move the sheet, so that the leading end of the sheet passes through the meshing position of the main roller 13 and the main pinch roller 16 which are rotating in the forward direction. Then, the main roller 13 conveys it to a predetermined position.

At the end of a plurality of rotations of the main roller 6, the short radius surface of the main roller 6 rotates on the sheet surface to cut off the contact with the sheet, and at the same time, synchronizes with the feeding roller. Since the maximum lift surface of the cam plate 72 that rotates by pushing down pushes down the upper surface of the projecting portion 77a of the above-described stand 77, the sheet is fed by the feeding roller 6
Is released from the action of being pressed against the surface.

When the tooth-missing portion 64a, which is the tooth-missing gear 64 rotated by the second planetary gear 56, reaches the meshing position of the second planetary gear 56, the second planetary gear 56 idles and cuts off the transmission thereof. The feeding roller 6, which is connected to the toothless gear 64 by a gear, stops rotating. At the stopped position, the recess 77b of the paper tray and the protrusion 72a of the cam plate return to the engaged state.

In the above-mentioned two embodiments, it is extremely easy to apply the present paper feeding device to the original reading device by disposing the reading head instead of the recording head. If the main roller pair of this apparatus is used as a registration roller used in a copying machine or the like, it can be applied to the copying machine very easily.

The recording head in the above embodiment is of the ink jet type. This inkjet head is for recording a character or the like on a paper by causing a state change including formation of bubbles in the ink by using thermal energy to form an ink droplet corresponding to a recording signal.

[0068]

As described above, according to the present invention, the transmission portion for transmitting the power of the output shaft 55 of the motor for driving the main roller to the feeding roller having the long and short radii is rotated by a predetermined amount of the motor. The transmission section drives the feeding roller through a predetermined non-interlocking step by the rotation in one direction,
The feeding roller feeds the paper to the meshing portion of the main roller pair, and then the transmission unit stops the feeding roller, and then the rotation of the motor in the other direction causes the transmission unit to further drive the feeding roller.
The driven feeding roller moves a sheet between a pair of main rollers by a series of feeding operations, so that a sheet such as a thin paper or a thick sheet can be raised to a predetermined position in a direction perpendicular to a generatrix of the main roller regardless of its thickness. It has become possible to carry with precision. Further, since the feeding roller and the main roller can be set at extremely close intervals, the device can be downsized. Even if it is difficult to provide a special member for the non-interlocking step, the transmission section
The non-interlocking step operation is possible, and by providing the non-interlocking step, one motor can be used as a drive source for a plurality of mechanisms, so that an apparatus with low manufacturing cost can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view of a sheet feeding device embodying the present invention.

FIG. 2 is a sectional view of a sheet feeding device embodying the present invention.

FIG. 3 is a perspective view of a second embodiment of the present invention.

FIG. 4 is an operation explanatory view of the sheet feeding device embodying the present invention.

FIG. 5 is an operation explanatory view of the sheet feeding device embodying the present invention.

FIG. 6 is an operation explanatory view of the sheet feeding device embodying the present invention.

FIG. 7 is an operation explanatory view of the sheet feeding device embodying the present invention.

FIG. 8 is an operation explanatory view of the sheet feeding device embodying the present invention.

FIG. 9 is an operation explanatory view of the sheet mounting table of the sheet feeding apparatus embodying the present invention.

FIG. 10 is an operation explanatory view of the sheet mounting table of the sheet feeding apparatus embodying the present invention.

FIG. 11 is an operation explanatory view of the sheet mounting table of the sheet feeding device embodying the present invention.

FIG. 12 is an operation explanatory view of another embodiment of the sheet mounting table of the sheet feeding device according to the present invention.

FIG. 13 is an operation explanatory view of another embodiment of the sheet mounting table of the sheet feeding apparatus according to the invention.

FIG. 14 is an operation explanatory view of another embodiment of the sheet placing table of the sheet feeding device according to the invention.

FIG. 15 is a sectional view of the second embodiment of the present invention.

FIG. 16 is a perspective view of the second embodiment of the present invention.

[Explanation of symbols]

 6 Feeding Roller 13 Main Roller 16 First Pinch Roller 18 Platen 27 Recording Head

Claims (9)

[Claims] 1. A feeding rotating body that feeds a sheet in a predetermined direction, and a forward / reverse rotatable member that clamps the sheet fed by the feeding rotating body when the sheet rotates in the normal direction to sandwich the sheet in the predetermined direction. A pair of conveying rotating bodies to be conveyed, and the feeding rotating body is rotated to feed a sheet in a predetermined direction, and the leading end of the sheet is abutted against the nip portion of the rotating conveying body that is rotating in the reverse direction, and after being abutted Control means for rotating the feeding rotating body while sliding on the sheet to continuously apply a feeding force in a predetermined direction, and subsequently rotating the conveying rotating body pair in the forward direction. Sheet feeding device. 2. The sheet feeding apparatus according to claim 1, wherein the feeding rotator separates from the sheet when the feeding operation is completed. 3. A mounting table for mounting a sheet, a large-diameter portion for contacting the sheet mounted on the mounting table and feeding the sheet in a predetermined direction when rotated in a forward direction, and a sheet. A feed rotating body having a small diameter portion that does not contact with each other, and a pair of feed rotating bodies that can rotate in forward and reverse directions and that sandwich the sheet fed by the feed rotating body and convey the sheet in the predetermined direction. A drive source that rotates the transport rotating body in the forward direction when rotating in the first direction, and rotates the transport rotating body in the reverse direction when rotating in the second direction; and a first direction of the drive source. Drive transmission means for transmitting the rotation of the drive source to rotate the feed rotating body in the forward direction and transmitting the rotation of the drive source in the second direction to rotate the feed rotating body in the forward direction; The source in the second direction to rotate the feed rotator in the forward direction, Sheet is fed in a predetermined direction, and the leading edge of the sheet is abutted against the nip portion of the conveying rotary body that is rotating in the reverse direction. Control means for controlling the drive source such that the drive source is rotated in the forward direction and the conveying rotating body pair is rotated in the forward direction. Sheet feeding device. 4. The drive transmission means meshes with a sun gear that is rotated by receiving drive from the drive source, and a gear that meshes with the sun gear and is connected to the feeding rotary body, either directly or via an idle gear. 4. The sheet feeding apparatus according to claim 3, further comprising a planetary gear that meshes with the planetary gear. 5. The sheet feeding apparatus according to claim 4, wherein the gear connected to the feeding rotating body is a toothless gear having a toothless portion on a part of its outer circumference. 6. The sheet feeding device according to claim 5, wherein the planetary gear or the idle gear transmits drive to the tooth-chipped gear until it faces the tooth-chipped portion. 7. When the planetary gear meshes with the toothless gear to transmit the drive and the drive transmission is cut off in opposition to the toothless portion, the feeding rotating body finishes feeding the sheet. 7. The sheet feeding device according to claim 6, wherein the small diameter portion is configured to face the sheet and stopped. 8. The sheet feeding apparatus according to claim 1, further comprising an inkjet head that forms an image on a sheet conveyed by the conveyance rotating body. 9. The sheet feeding apparatus according to claim 8, wherein the inkjet head forms an image by ink droplets formed by thermal energy.