JPS62136444A - Automatic sheet feeding mechanism - Google Patents

Abstract

PURPOSE:To prevent device from containing residual sheets at the time of cassette taking-out by releasing the pushing force of a separator roller and by returning the recording sheet whose rear end remains in the separation part, to inside the cassette through utilization of rotation of the separator roller and its own weight of the sheet. CONSTITUTION:Because the frictional transmission remains minor when a recording sheet 60 transported by a flat belt 37 intrudes into a separation part 64 with the aid of friction force of the recording sheets between, the transmissive drive force of a feed roller 31 is smaller than the drive force given through a slip mechanism 63, so that a separator roller 39 rotates clockwise to carry all recording sheets 60 but the uppermost one back to the separation part 64, where balance is attained with the drive force. The roller 39 come to a standstill and only one recording sheet 60 is fed onto a platen drum 1. If an idler 52 is restituted when sheet thus separated 60 is going to pass by a sensor 26, the sheet 60 which has remained together with a tray 59, is accommodated in a cassette 58, and the roller 39 rotates clockwise. The recording sheet 60 which is separated by the roller 39 and whose leading edge remains thereon will be returned into the cassette 58 by its own weight.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hard copy device, and particularly to an automatic paper feeding mechanism suitable for conveying recording paper.

[Background of the invention]

An example of this type of automatic paper feeding device using a folding mechanism is shown in FIG. 8, such as a facsimile document feeding unit.

As shown in FIGS. 9 and 10, the lower conveying roller 66 is made up of a lower conveying roller pulley portion 664 rotated counterclockwise by the motor 65 and an elastic body 664 formed on the outer periphery of the pulley portion 66tL. A paper feed roller 31 and a lower conveyance roller 67 rotationally driven by a lower conveyance roller 66
, a rotary roller 68 that is coaxial with the lower conveyance roller 67 and rotationally driven via a slip mechanism 63, and a separation roller 39 that is in pressure contact with the paper feed roller 31 and the rotary roller 68. The recording paper 6 on the recording paper tray 69
o is separated and conveyed at separation N564. In this case, if the roller that picks up the recording paper 60 is applied to a removable cassette, the separated paper will remain in the separating section 64 and will not return to the cassette, resulting in a problem when the cassette is taken out of the device. This can cause phenomena such as recording paper remaining inside the device.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to improve the inadequacies of the prior art and provide an automatic paper feeding mechanism with good operability.

[Summary of the invention]

The present invention is an automatic paper feeding mechanism that uses a sliding mechanism and is compatible with removable paper cassettes.By releasing the pressure between the separating rollers and continuing the rotation of the rollers, the paper that has protruded from the paper cassette is returned to the inside of the cassette. [Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. Figures 1 to 3 are full-circle diagrams showing the hard copy apparatus according to the present invention. Figure 1 shows the paper feeding state in the recording paper cassette, Figure 2 shows the same paper ejecting state, and Figure 3 shows the recording paper manual feed. This is the paper feeding state at the time.

The shaft portion 1a of the platen drum 1 is rotatably supported by a bearing 4 attached to a substrate 3, and is connected to a drive motor 2 attached to a button substrate 3 so as to transmit rotation. A 5° shaft 6 is embedded in the base plate 3, and a reel stand 7 for winding ink paper and a reel stand 8 for feeding out are rotatably attached to the reel stand 8, respectively. Brake force is constantly applied. The reel stand 7 connects the drive motor 2 to the belt 11 and shaft 5.
Rotational power is transmitted and driven through a pulley 12 rotatably attached to a slide clutch 13, which is comprised of a felt washer, a spring, etc. (not shown).

The ink paper 14 before use is wound around a core 15, and the tip of each ink paper 14 is fixed to the core so that the ink paper 14 after use is wound around the core 16. . - Ten thousand roll cores 15 and 16 are reel stands 8 and 7 respectively
It is configured to be engaged and rotationally coupled to the. Board 3
A head arm 19 on which a thermal head 18 is mounted is rotatably attached to a shaft 17 mounted above, and a spring 20 is also pivotally supported. spring 20
is mounted between a pin 21 implanted in the substrate 3 and a pin 22 implanted in the head arm 19 so as to bias them in the direction of separation. The ink paper 14 is connected to the spring 20
It is pressed between a part of the circumference of the platen drum 1 and the thermal head 18. The paper guide 25 is attached to the base plate 3 along the upper and lower sides of the circumference of the platen drum 1, and a leaf spring 24 is attached to a part of the paper guide 23.
The auxiliary roller 25 is rotatable and the platen drum 1
The platen drum 1 is arranged so as to be press-bonded to the platen drum 1, and is configured to rotate as a result of the platen drum 1. A sensor 26 for detecting paper is disposed in another part of the paper guide 23, and is capable of detecting the presence or absence of paper on one revolution of the platen drum.

The tip 184 of the thermal head 18 is attached to the ink paper 14ya
It is rounded so that it can be easily removed from the L-platen drum 1.

On the circumference of the platen drum 1, the head tip 18α
Next to this, there is an ejection piece 28 which is rotatably attached to a shaft 27 mounted on the board 3, and a pin 29 mounted on the ejection piece 28 and a part 3a of the board are connected in the pulling direction. The ejecting piece 28 is moved by the spring 30 which is stretched so as to be biased.
The tip of the platen drum 1 is made to come into light pressure contact with a portion of the circumference of the platen drum 1. FIGS. 4, 6, and 7 show the paper feeding and discharging mechanism. The paper feed roller 31 has a shaft portion 314 rotatably supported by a bearing 32 attached to the substrate 3.1. Rotational power t is transmitted from the drive motor 2 to a belt 35 and a pulley 34 fitted to the shaft portion 31α, thereby driving the drive motor. The pickup roller 35 is rotatably attached to a shaft 36 mounted on the substrate 3, and a flat belt 57 is stretched around the circumference of the paper feed roller 31 and the pickup roller 55, so that the pickup roller 35 can be driven to rotate. Further, a plate spring 38 attached to a part of the substrate 5 is pressed onto the pickup roller 35 via a flat belt 35. As shown in Fig. 5, the separation roller 39 is made of plastic.
An elastic body 39b is stretched in a cylindrical shape around the circumference of the shaft 9a, and a shaft 401C is rotatably attached. The shaft 40 is
It is rotatably supported by a bearing 43 that is tightly coupled to a roller arm 42 that is rotatably attached to a pin 41 implanted in the substrate 3 . The rotational power of the paper feed roller 31 is provided by the shaft portion 3.
A belt 45. axis 40
The felt receiver 47 is transmitted to the pulley 46 engaged with the shaft 40, the felt washer 4B is attached to the felt receiver 47, the separation roller boot portion 39a,
A spring receiver 49 rotatably attached to the shaft 40 and the shaft 40
Stopper 5 pulling separation roller pulley part 394 engaged with
The force is transmitted to the separating roller 39 via a slip mechanism 63 formed by a spring 51 disposed between the spring receiver 49 and the spring receiver 49 . The paper feed idler 52 is rotatably attached to a shaft 53 implanted in the substrate 3, and a portion of the paper feed idler 52 engages with a worm portion 544 of the motor 54. Further, the paper feed idler 52 has a protrusion 52a, and when the paper feed idler 52 rotates clockwise, the roller arm 42
It is configured to push down the bottom edge of the. A lift arm 56 and a spring 57 are rotatably attached to a shaft 55 implanted in the paper feed idler 52. A paper feed idler 52 is mounted at the center of the shaft 55 so as to bias it counterclockwise.

A vapor tray 59 is disposed inside the recording paper cassette 58, and an IJ7 tom arm 56 can enter through a partial cutout of the recording paper cassette 58. A plurality of recording papers 60 are arranged on the vapor tray 59, and the paper feed idler 5
2, the uppermost recording paper 60 is lifted together with the paper tray 59 and comes into pressure contact with a part of the flat belt 37 disposed above. Exterior 61
A paper feed/discharge tray 611, which is a part of the recording paper 60, is a tray for manually feeding and discharging the recording paper 60.

Next, the operations of paper feeding, printing, and paper ejection will be explained. To feed paper, first load the recording paper cassette 58 or place a sheet of recording paper 60 on the paper feed/discharge tray 61a and open the paper feed/discharge port 62.
Insert into. The former will be explained first, and the latter will be explained second.

In order to load the recording paper cassette 58, the paper feed idler 52 is in an initial state as shown in FIGS. 2 and 7. First, the drive motor 2 is driven to drive the platen drum 1. Reel stand7. Paper feed roller 31, pickup roller 551
Rotate the separation roller 39 clockwise. Next motor 5
0 to rotate the paper feed idler 52 counterclockwise around the pin 53 by a required angle. Paper feed idler protrusion 52α
The tension of the belt 45 causes the separation roller 59 to rotate together with the roller arm 42 counterclockwise around the bin 41 until the separation roller 39 comes into pressure contact with the flat belt 37 below the paper feed roller 31. Flat belt 3 at this time
The required pressing force of the first separation roller 39 is obtained by the belt 45.

Further, the separation roller 39 is connected to the paper feed roller 3 via the belt 37.
Since the driving force transmitted from 1 is greater than the driving force transmitted through the slip mechanism 63, it rotates counterclockwise. On the other hand, the lift arm 56 also rotates in synchronization to lift one end of the recording paper 60 together with the paper tray 59 so that the uppermost recording paper 60 comes into pressure contact with the flat belt 57 . At this time, since the overall thickness of the recording paper 60 differs depending on the number of sheets of recording paper 60, the setting is made so that the required pressure can be formed between the flat belt 37 and the recording paper 600 using the spring 57. As soon as the recording paper 60 is applanated on the flat belt 37, the recording paper 60 is transferred to the paper feed roller 31.
The paper is conveyed between the belt 67 and the separation roller 39 located at the bottom of the paper. At this time, the recording paper 60 may cause friction and be transported several sheets, so the recording paper 60 Perform the separation. This recording paper separation operation will be explained later.

The separated recording paper 60 is guided by a part of the ejection frame 28, is conveyed between the platen drum 1 and the paper guide 23, and is conveyed under pressure between the auxiliary roller 25 and the platen drum 1. When the recording paper 60 passes above the sensor 26, the motor 5
0 is reversely rotated and the paper feed idler 52 is rotated at a required angle around the bin 41 to return the paper feed idler 52 to its initial setting state.

Next, as the platen drum 1 rotates, the thermal head 1
When the ink paper 14 enters between the ink paper 14 which is being conveyed under pressure between the thermal head 18 and the platen drum 1, and passes between the thermal head 18 and the platen drum 1, energization to the thermal head 18 is started. The printing operation is performed for the required time. The used ink paper 14 is wound up by the drive of the reel stand 7. When the recording paper 60 reaches the tip of the ejection frame 28 , the recording paper 60 moves along a part of the ejection frame 28 toward the flat belt 37 , is conveyed under pressure between the flat belt 37 and the leaf spring 38 , and is conveyed from the paper feed/discharge port 62 . The paper is discharged onto the paper feed/discharge tray 614, the drive motor 2 is stopped, and the operation is completed.

Second, first, the motor 50 is driven and the paper feed idler 5
Rotate 2 counterclockwise by the required angle.

Next is the drive motor 2y! / Drive platen drum 1° reel stand 7. Paper feed roller 3t Pick-up roller 35
Rotate it clockwise. The separation roller 39 is driven by the paper feed roller 51 via the belt 37 and rotates counterclockwise. Recording paper 60mm paper feed/output tray tsta 1
When the recording paper 60 is stacked and pushed into the paper feed/discharge port 62, the recording paper 60 is conveyed under pressure in the separating section 64.

The subsequent operation is the same as that of f'l.

Here, the recording paper separation operation described above will be described. When only the uppermost sheet of the recording paper 60 conveyed by the flat belt 37 below the pickup roller 35 enters the separation unit 64, the separation roller 39 transfers the information from the paper feed roller 31 via the flat belt 37 and the recording paper 60. Since the driving force transmitted is larger than the driving force transmitted via the slip mechanism 63, the recording paper 60 rotates counterclockwise and is conveyed onto the circumference of the platen drum 1. Flat belt 3 below pickup roller 55
When the recording paper 60 conveyed by 7 enters the multi-plate separation unit 64 due to the frictional force between the recording papers 60, the frictional transmission between the recording papers 60 is small, so the paper is fed via the flat belt 37 and the recording paper 60''11. Since the driving force transmitted from the roller 31 is smaller than the driving force transmitted through the slip 4N1465, the separating roller 39 rotates clockwise and reversely conveys all but the top recording paper 6λ to the separating unit 64. death,
When the driving force transmitted through the flat belt 37 and the recording paper 60 and the driving force transmitted through the slip mechanism 63 are balanced, the separation roller 39 stands still and only the 601 recording papers move up the platen drum 10 times. and is transported.

The recording paper 60 separated into one sheet as described above is sent to the sensor 2.
When the paper feed idler 5Q is returned to its initial state when passing through the paper feed idler 5Q, the recording paper 60 remaining together with the vapor tray 59 is stored in the recording paper cassette 58. On the other hand, since the separation roller 39 is in its initial state, it rotates clockwise, and as shown in FIG.
The recording paper 60 which was separated at 9 and whose leading edge remained on the circumference of the separation roller 39 is returned to the recording paper cassette 58 by its own weight.

〔Effect of the invention〕

According to the present invention, in an automatic paper feeding mechanism compatible with a two-paper cassette that utilizes a sliding mechanism, by releasing the pressing force of the separating section, the recording paper with the leading edge left in the separating section can be removed by rotation of the separating roller and The recording paper can be returned to the inside of the cassette by its own weight, so when removing the cassette from the device,
This has operational advantages such as no paper remaining in the device.

[Brief explanation of drawings]

Figures 1, 2, and 3 are all front views showing one embodiment of the automatic paper feed mechanism according to the present invention, Figure 4 is a perspective view of the automatic paper feed mechanism, and Figure 5 is a view of the inside of the separation roller. A block diagram of the slip mechanism, FIGS. 6 and 7 are front views of the automatic paper feed mechanism, FIG. 8 is a perspective view showing the automatic paper feed machine IR of a conventional fax machine, FIG. 9 is a block diagram of the same, and FIG. 10 is a configuration diagram of the slip machine shoulder. 31...Paper feed roller, 35...Pickup roller, 39...Separation roller, 56...Lift arm, 5
8... Recording paper cassette, 60-... Recording paper. ITh] Invitation 4m 6th exit

Claims (1)

[Claims] Recording paper cut to a predetermined length, a cassette in which a plurality of recording papers can be placed and removable from the apparatus, and a part of the recording paper lifted from the bottom when the cassette is loaded into the apparatus. an arm disposed; a first roller disposed so as to press the recording paper when the arm rises; and a first roller disposed in a direction in which the recording paper is conveyed by rotation of the first roller. A second roller rotates in the same direction as the first roller, and a rotational force is transmitted to the lower part of the second roller by a sliding mechanism such as a friction clutch in the same direction as the second roller. and a conveying member for conveying the recording paper located downstream of the second roller and the third roller, and for conveying the recording paper. By pressing the arm, the recording paper is conveyed between the second roller and the third roller (hereinafter referred to as a separating section), and the recording paper is conveyed between the second roller and the third roller. In the apparatus including a separating section that separates the recording paper into one sheet, when the recording paper separated into one sheet in the separating section is conveyed by the conveyance member, the arm is lowered and the unconveyed recording paper is transferred to the cassette. Store it inside the
Furthermore, by moving the second roller that is rotating or the third roller that is transmitting rotational power, releasing the pressure between the second roller and the third roller, and continuing to rotate the third roller. An automatic paper feeding mechanism characterized in that the recording paper protruding from the cassette toward the separating section is stored in the cassette.