JPH0423740A - Automatic paper feeding device and usage thereof - Google Patents

Abstract

PURPOSE:To set multiple pieces of sheets easily by touching a paper feeding roller on the lower surface of the sheets set on a horizontal paper feeding frame, and providing a means for moving an initial carrying spring for pressing the top surface of the sheets from a pressure position to a separation position. CONSTITUTION:Multiple sheets 3 are piled on a paper feeding frame 11 which is formed horizontally, and a paper feeding roller 13 projecting a little from the frame 11 touches the lower surface of the paper feeding roller 13. The top surface of the sheets 3 is pressurized by an initial carrying spring 16. When the paper feeding roller 13 is rotated in the negative direction, a reversing roller 17 touching the paper feeding roller 13 is locked and moved to an upper position to push the carrying spring 16 up. When the paper feeding roller 13 is rotated normally, the reversing roller 17 is rotated together and is fallen to a certain position, and the top surface of the sheets 3 is pushed by the carrying spring 16 to be fed out by the paper feeding roller 13. Consequently, multiple pieces of sheets 3 can be set and fed smoothly.

Description

[Detailed Description of the Invention] [Summary] In a facsimile (hereinafter referred to as FAX) device or an electronic printer (hereinafter referred to as printer) device, sheet-like media (hereinafter referred to as sheet) such as a plurality of stacked originals or recording paper are To provide an automatic paper feeding device that automatically feeds sheets one by one and a method of using the same, which smoothly and reliably feeds sheets one by one without the need to wedge the sheets even when feeding a large number of sheets. The paper feed frame has a substantially horizontal paper feed frame, and a paper feed that protrudes slightly upward from the top surface of the paper feed frame and contacts the bottom surface of the sheet set on the paper feed frame. a roller, an initial conveyance spring provided above the paper feed roller that presses the top surface of the sheet with a predetermined pressure, and an initial conveyance spring that is placed between a lower position in contact with the upper surface of the sheet and an upper position away from the sheet. An automatic sheet feeding apparatus is constituted by a means for moving the sheet, and the sheet downstream from the pressing area of the initial conveyance spring in the direction in which the sheet travels.

[Industrial application field]

The present invention is an automatic machine that automatically feeds sheet-like media (hereinafter referred to as sheets) such as stacked manuscripts or recording paper one by one in a facsimile (hereinafter referred to as FAX) device or an electronic printer (hereinafter referred to as printer) device. This paper relates to a paper feeding device and how to use the same.

In recent years, it has become necessary to improve the reliability of automatic paper feeding devices for FAX or printer devices, that is, to be able to reliably and smoothly feed a large number of stacked sheets one by one, and to have a simple sheet setting method. is required.

[Conventional technology]

FIGS. 5 and 6 show conventional automatic paper feeding devices in FAX or printer devices. In these figures, 1 is the main body of the apparatus, 2 (2a) is a paper feeding frame tilted downward in the direction of movement for placing sheets, 3 (3a) is a large number of sheets, 4.5 is an auxiliary roller, and 6 (6a) is a paper feed roller, 7 is a separation pad, 8 is a pressure spring, 9 (9a) is an initial conveyance spring, and 10 is a guide plate.

When there are a large number of sheets 3, as shown in the enlarged view of FIG. 6, the tips of the sheets 3 are placed in a wedge shape on the inclined frame 2, and the sheets 3 are set so as to be slid thereon. The set sheet 3 is transported between a paper feed roller 6 arranged so as to protrude slightly upward from the frame 2, and this paper feed roller 6.
It is clamped between the initial conveyance spring 9 and the initial conveyance spring 9, which presses it diagonally against the initial conveyance spring 9. When the paper feed roller 6 rotates, the bottom sheet is sent out. The fed sheet passes between the paper feed roller 6 and the separation pad 7, further passes through the guide plate 10, and is sent in the traveling direction A by a pair of auxiliary rollers 4 and 5.

The separation pad 7 is pressed against the paper feed roller 6 with an appropriate pressure by a pressure spring 8 downstream of the initial conveyance spring 9 in the advancing direction. Therefore, when two or more sheets advance beyond the initial conveyance spring 9, the separation pad 7 holds the upper sheet, and the paper feed roller 6 allows only the lower sheet to pass.

In this case, the conveying force of the paper feed roller 6 is set larger than the braking force of the separation pad 7. That is, if the friction coefficient between the paper feed roller 6 and the sheet is μm, the friction coefficient between the sheet and the separation pad 7 is μ2, and the friction coefficient between the sheets is μ, then the relationship μm>μm>μm is satisfied. It is set up to work.

[Problem to be solved by the invention]

With the conventional automatic paper feeder described above, you only need to set a small number of sheets with their edges aligned, but when you have a large number of sheets, you have to unravel them into a wedge shape, which requires skill and requires a lot of skill. 3 and the initial conveyance spring 9 have an acute angle, so the clamping by the initial conveyance spring 9 is limited, and when a large number of sheets are set, the sheets cannot be smoothly fed out one by one. was there.

SUMMARY OF THE INVENTION The present invention provides an automatic paper feeder and a method for using the same, which can smoothly and reliably feed out sheets one by one without the need to make the sheets into a spiral shape even when a large number of sheets are fed. The purpose is to provide

[Means to solve the problem]

In order to solve such problems, according to the first invention, as shown in FIG.
), a paper feed roller (13) that protrudes slightly upward from the top surface of the paper feed frame and contacts the bottom surface of the sheet (3) set on the paper feed frame; an initial conveyance spring (16) for pressing the upper surface of the sheet with a predetermined pressure; and means (17) for moving the initial conveyance spring between a lower position in contact with the upper surface of the sheet and an upper position away from the sheet. and a separation pad (14) that contacts the paper feed roller downstream of the pressing area of the initial conveyance spring in the sheet traveling direction.

According to the second invention, the substantially horizontal paper feeding frame (11)
, a paper feed roller (13) that protrudes slightly upward from the top surface of the paper feed frame and contacts the bottom surface of the sheet (3) set on the paper feed frame; Regarding A), there is a sensor (12) provided upstream of the paper feed roller to detect whether a sheet is set, and a sensor (12) provided above the paper feed roller that presses the top surface of the sheet with a predetermined pressure. means (17) for moving the initial conveyance spring between a lower position in contact with the upper surface of the sheet and an upper position away from the sheet; In an automatic paper feeder comprising a separation pad (14) that contacts the paper feed roller downstream, the sensor (12)
By detecting the tip of the initial conveyance spring (process 6),
) is raised, and the initial conveyance spring (16) is lowered after a predetermined time has elapsed since the detection.

[For production]

According to the first aspect of the present invention, since the paper feeding frame (11) is substantially horizontal, there is no need to form the sheets into a tree shape even when a large number of sheets (3) are set. Further, since the initial conveyance spring (8) moves up and down, sheet setting and sheet feeding are performed smoothly.

According to the second invention, the sensor (12) is attached to the seat (3).
By detecting the tip of the initial conveyance spring (
16) is raised to facilitate setting, and after a predetermined time has elapsed since the detection by the sensor, that is, when the sheet setting is completed, the initial conveyance spring (16) is lowered,
Apply pressing force to the sheet. Therefore, reliable and smooth automatic paper feeding is possible.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an embodiment of the automatic paper feeder of the present invention;
FIG. 2 is a perspective view of an embodiment of the invention.

In the embodiment, a document (sheet) supply unit in a printer device or a FAX device is shown. In these figures, 11
is a substantially horizontal sheet feeding frame, on which a large number of sheets 3 are stacked and set.

12 is a sensor provided on the paper feeding frame 11;
The tip of the sheet 3 is brought into contact when the sensor is sensed in the direction of arrow A. Reference numeral 13 denotes a paper feed roller that protrudes slightly upward from the top surface of the paper feed frame 11.
When the sheet 3 is set on the paper feeding frame 11, the lower surface of the sheet 3 comes into contact with the paper feeding roller 13. In addition,
The sensor 12 detects the paper feed roller 13 in the paper feed direction A of the sheet.
It is installed immediately upstream of the 16 is an initial conveyance spring provided above the paper feed roller.

This initial conveyance spring 16 is positioned at a lower position (where it contacts the upper surface of the sheet 3 and presses the upper surface of the sheet downward with a predetermined pressure).
1) and an upper position away from the sheet 3 or paper feed roller 13 (position indicated by a two-dot chain line in FIG. 1). 17 is the initial conveyance spring 16
It is a reversing roller that serves as a means to move the A ratchet (not shown) or the like is incorporated so as to idle when a rotational force in the direction of arrow C is applied. Reversing roller 1
7 is attached to the free end of an arm 18 so as to be in constant contact with the paper feed roller 13 with appropriate pressure, and this arm 18 is supported on a fixed shaft 19 by a long base 20 thereof.

Therefore, when the paper feed roller 13 rotates by a predetermined angle in the negative direction, the reversing roller 17 is locked in its own rotation and is raised from the solid line position in FIG. 1 to the chain line position.

On the other hand, when the paper feed roller 13 rotates in the positive direction, that is, in the paper feed direction, the reversing roller 17 also rotates at the same time and descends along the surface of the paper feed roller 130. Then, the arm 17 reaches a position regulated by the elongated hole 20 (ie, the solid line position in FIG. 1) and stops. After that, even if the paper feed roller 13 rotates in the positive direction, the reverse rotation roller 17 simply idles on the paper feed roller 13.

The initial conveyance spring 16 is constantly biased downward, for example in the area of the paper feed roller 13. Then, the reversing roller 17
is in constant contact with the lower surface of the initial conveyance spring 16. Therefore, when the reversing roller 17 is raised as described above, the initial conveyance spring 16 resists its biasing force and moves upward (the position indicated by the two-dot chain line in FIG. 1), and the reversing roller 17 is lowered. When this occurs, the initial conveyance spring 16 descends due to its biasing force and presses the upper surface of the sheet 3 set on the sheet feeding frame 11 (the position indicated by the solid line in FIG. 1). In this case, the reversing roller 17 separates from the initial conveyance spring 16 and further descends.

Next, the operation of the embodiment of the present invention will be explained with reference to FIG. First, a large number of sheets 3 are set while sliding on the paper feeding frame 11 in the direction of arrow A. The leading edge of the sheet 3 rotates an actuator attached to the leading end of the sensor 12, turning the sensor 12 ON. As a result, the paper feed roller 13 driven by the motor (not shown) rotates in the negative direction by a predetermined angle as described above, and the torque causes the reversing roller 17, which is appropriately pressed against the paper feed roller 13, to rotate in the negative direction. Lift it along the surface of the paper feed roller 13 without rotating it. Also, lift up the initial conveyance spring 16 that is in pressure contact with this reversing roller 17 (the position indicated by the two-dot chain line in Fig. 1). In this state, the setting of the sheet 3 is completed, and the lower side of the leading edge of the sheet 3 is fed. It comes into contact with the upper part of the paper roller 13. The paper feed roller 13 is set to rotate in the forward direction several seconds after the sensor 12 is turned on. As a result, the reverse rotation roller 17 idles and descends as described above, and the initial conveyance roller 13 descends to press the upper surface of the sheet 3. Thereafter, the sheets 3 are sequentially fed one by one by the paper feed roller 13, starting from the bottom one, based on a paper feeding command from the apparatus main body. At this time, the idling reversing roller 17 acts as an auxiliary roller for paper feeding, and the sheet 3 passes between the paper feeding roller and the reversing roller 17.

With respect to the traveling direction of the sheets 3, the separation pad 14, which is pressed against the paper feed roller 13 by the pressure spring 15 downstream of the pressure region of the initial conveyance spring 16, is configured to move when two or more sheets 3 are fed. It is to be separated so that there is no problem. In this case, the friction coefficient between the paper feed roller 13 and the sheet 3 is set to μm, and the friction coefficient between the sheet 3 and the separation pad 14 is As in the conventional case, the friction coefficient μ2 between the sheets 3 and the friction coefficient μ3 between the sheets 3 are set so that the relationship μm>μ2>μm holds true.

〔Effect of the invention〕

According to the present invention as described above, since the paper feed frame 11 is made substantially horizontal, it is possible to set a large capacity of sheets, and there is no need to unravel the sheets into a wedge shape, making it easy to set the sheets. be. Further, the front edge of the sheet, especially the lowermost sheet, is no longer folded or caught, as shown in FIG. 4, and the reliability of automatic sheet feeding is improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the automatic paper feeder of the present invention;
Fig. 2 is a perspective view of the embodiment of the present invention, Fig. 3 is a diagram showing the operation of the embodiment of the present invention, Fig. 4 is a diagram showing the state of a document (sheet) being caught, and Fig. 5 is a diagram of the conventional automatic FIG. 6 is a schematic cross-sectional view of the paper feeding device, and is an enlarged view of the portion marked ■ in FIG. 5. 3... Original (sheet), 11... Paper feed roller, 1
2... Sensor, 13... Paper feed roller, 14... Separation pad, 15... Pressure spring, 16... Initial conveyance roller, 17... Reverse roller, 18... Arm, 19... axis, 20... long. Collection of embodiments of the present invention 1 Fig. 11...Paper feed frame 17...Perspective view of an embodiment of a reversing roller Fig. 220...Example of a long original in a folded state Fig. 4

Claims (1)

[Claims] 1. A substantially horizontal paper feed frame (11), and a frame that protrudes slightly upward from the top surface of the paper feed frame and is attached to the bottom surface of the sheet (3) set on the paper feed frame. a paper feed roller (13) in contact with the paper feed roller;
An initial conveyance spring (1
6), and a means (6) for moving the initial conveyance spring between a lower position in contact with the upper surface of the sheet and an upper position away from the sheet.
17), and a separation pad (1
4) An automatic paper feeding device consisting of. 2. Means (1) for moving the initial conveyance spring (16) up and down
7) is held in pressure contact with the paper feed roller (13) at all times, and when the paper feed roller rotates in the negative direction, its own rotation is locked and rises; It consists of a reversing roller (17) that rotates idly and descends when the roller rotates in the positive direction, and the lower surface of an initial conveyance spring (16) that is urged downward comes into contact with the reversing roller. The automatic paper feeder according to claim 1, characterized in that: 3. A substantially horizontal paper feed frame (11), and a paper feed roller (which protrudes slightly upward from the top surface of the paper feed frame and contacts the bottom surface of the sheet (3) set on the paper feed frame). 13), a sensor (12) provided upstream of the paper feed roller in the sheet feeding direction (A) to detect whether or not a sheet is set, and a sensor (12) provided above the paper feed roller. , an initial conveyance spring (16) that presses the upper surface of the sheet with a predetermined pressure, means (17) for moving the initial conveyance spring between a lower position in contact with the upper surface of the sheet and an upper position away from the sheet; In an automatic sheet feeding device comprising a separation pad (14) that contacts the sheet feeding roller downstream from the pressing area of the conveyance spring in the sheet traveling direction, the sensor (12) detects the leading edge of the sheet (3). to raise the initial conveyance spring (16), and to raise the initial conveyance spring (16) after a predetermined time has elapsed since the detection.
16) A method of using an automatic paper feeder, characterized in that the paper feeder is lowered.