KR100268134B1 - Automatic feeding devicee. - Google Patents

Abstract

PURPOSE: An apparatus for supplying automatically papers is provided to transfer correctly a provided paper without an error by maintaining constantly a gap between a pickup roller and a paper bottom plate. CONSTITUTION: A pickup roller(52), an ADF roller(62), and a transfer roller(19) are driven by a transfer motor(18). A paper bottom plate(51) is contacted closely with the pickup roller(52). A paper sensor(55) is installed at a lower portion of a paper supply cassette(50). A rubber plate(60) is contacted with the ADF roller(62). A cam motor(10) is fixed to one side of a frame. A cam(21) is rotated by the cam motor(10). A lever bracket(30) is moved to an upper and a lower direction by the rotation of the cam(21). A lever(40) and an ADF spring(49) are moved according to the movement of the lever bracket(30).

Description

Automatic feeder

The present invention relates to an automatic paper feeder for general office equipment such as a facsimile machine or a copy machine, in particular, a device that requires a precise feed, such as a digital video printer, and more particularly, the sheet separated into sheets by the automatic paper feeder once the feed roller. When engaged, the sheet separator is separated from the roller surface by a certain distance, and relates to a detachable automatic feeding device configured not to disturb the flow of paper precisely conveyed by the transport roller.

In general, general office equipment such as copiers, fax machines, and printers are equipped with an automatic paper feeder for feeding paper loaded in the paper cassette into the feed path of the machine, and the automatic paper feeder feeds several sheets at a time. A sheet separator is provided to separate and feed the sheet so that it is not fed.

As a representative example of such an automatic paper feeder, as shown in FIG. 1, the paper bottom plate 51 at the tip of the paper feeder cassette 50 is installed to be in close contact with the pickup roller 52, and the rubber pad 70 has a leaf spring ( 71) is fixedly attached to the ADF roller 62, and the feed roller 19 is provided on the feed path passing through the ADF roller 62.

Looking at the operation relationship of the automatic paper feeder of this structure, first, when the paper base plate 51 and the pickup roller 52 is engaged to feed the paper loaded in the paper cassette 50 to the ADF roller 62, then The ADF roller 62 is in close contact with the rubber pad 70 to separate the supplied sheet into sheets and feed the sheet into the feed roller 19.

At this time, the front end of the paper is engaged with the above-mentioned feed roller, and the rear of the paper is in a state of being engaged between the ADF roller 62 and the rubber pad 70.

In addition, the feed roller and the ADF roller 62 is configured to have a slightly different circumferential speed, and is designed to rotate the feed roller 19 a little faster so that the paper to be fed is not wrinkled.

Therefore, since the paper engaged by the feed roller 19 is also engaged with the ADF roller 62 at the rear, there is a problem that tension is generated in the paper to be conveyed, which hinders the conveyance of the paper.

In order to prevent this problem, the power transmission device of the ADF roller 62 is provided with various types of one-way power transmission devices such as a spring clutch.

Therefore, when the fed sheet starts to be conveyed quickly by the feed roller 19, the ADF roller 62 held behind the sheet is configured to idle by the tension of the conveyed sheet.

However, even in the paper feeder by this one-way power transmission device, since the paper to be conveyed is held between the rear ADF roller 62 and the rubber pad 70, it is prevented from being accurately conveyed by the feed roller 19. There was a problem.

In particular, in a device in which image data is overlaid and repeatedly printed along a transport path, such as in a digital video printer, the data must be output while the paper is precisely conveyed. There is a problem that output errors occur without overlapping each other.

Therefore, the present invention has been devised to solve such a conventional problem, and the main object of the present invention is that the ADF roller and the rubber pad and the pickup roller and the bottom plate of the paper when the leading end of the paper is engaged with the feed roller. It is an object of the present invention to provide an automatic paper feeder configured to be spaced apart from each other by a certain distance so as not to impede precise feeding of paper.

1 is a cross-sectional view of main parts of a conventional automatic paper feeder,

2 is an exploded perspective view of an automatic paper feeder according to the present invention;

3A is a sectional view showing the principal parts of a sheet feeder when an automatic sheet feeder according to the present invention feeds paper;

3B is a sectional view showing the principal parts of a standby state of the automatic document feeder according to the present invention.

4 is a floor chart showing an operation procedure of the microprocessor according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: cam motor 11: worm

12: gear train 15: frame

17: auxiliary frame 18: feed motor

19: feed roller 20: cam shaft

21: cam 22: protrusion

25 Actuator 26 Porter Sensor

30: lever bracket 31: bottom surface

33: side 35: through hole

40: lever 41: tip

43: bracket 44: incision surface

45: through hole 46: pin

48: torsion spring 49: ADF spring

50: paper feed cassette 51: paper bottom plate

52: pickup roller 53: guide hole

54: through hole 55: paper presence sensor

60: rubber plate 61: rubber

62: ADF roller 63: hinged ball

65: sensor 70: rubber pad

71: leaf spring

The construction means for achieving the object of the present invention is provided with a pick-up roller, an ADF roller and a feed roller, which are supported by the transfer motor and supported by both side frames, and a paper base plate in close contact with the pick-up roller. An automatic paper feeder comprising an installed paper feed cassette and a rubber plate in close contact with the ADF roller for separating paper.

A cam motor fixed to one frame;

Lifting means for pivoting the paper base plate and the rubber plate up and down while being linked by the cam motor;

It characterized in that it comprises a control means for controlling the rotation of the cam motor and the transfer motor.

As a preferred embodiment of the above configuration, the elevating means includes: a cam provided at the center of the shaft so as to be interlocked by the cam motor; A lever bracket which is hinged so as to be interlocked up and down by being pressed by the protrusion of the cam as the cam rotates; A lever installed on the lever bracket to rotate the paper base plate up and down; It is made of the ADF spring is installed on the lever bracket to rotate the rubber plate up and down,

The control means may include: a sensor installed on a transport path to detect whether paper feeding is completed; An actuator comprising a large diameter semicircle and a small diameter semicircle, the actuator being installed to rotate integrally with the camshaft; A photo sensor controlled by the actuator for sensing a rotational angle of the camshaft; It consists of a microprocessor for controlling the cam motor according to a pre-input based on the electrical signal received from the sensor and the photosensor.

According to the above configuration, when an operation signal is applied from the outside, when the built-in microprocessor drives the cam motor to rotate the cam and the actuator of the cam shaft 180 degrees, it is detected by the photosensor and transmitted to the microprocessor, The microprocessor stops the cam motor. Therefore, at this time, the cam presses the rear end of the lever bracket to bring the paper bottom plate and the rubber plate into close contact with the upper pickup roller and the ADF roller. Subsequently, the microprocessor drives the transfer motor to separate the sheets loaded in the feed cassette into sheets through the pickup roller and the ADF roller and feed them into the feed path.

Subsequently, when the leading edge of the sheet of paper to be fed operates the sensor installed on the feed path, the microprocessor rotates the cam motor after a certain step, and as described above, when the signal contracted by the photosensor is input, the cam is again cam. The motor will be stopped. Therefore, at this time, the paper bottom plate and the rubber plate are separated by a certain distance from the upper pickup roller and the ADF roller, and the paper fed by the conveying path is engaged with the conveying roller to perform the printing operation.

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

2 is an exploded perspective view of the automatic paper feeder according to the present invention, reference numeral 10 denotes a cam motor controlled by an embedded microprocessor, and 20 denotes a cam which integrally couples the cam 21 and the actuator 25. It is a shaft, 30 is a lever bracket operated by the above-described cam 21, 40 is installed in the lever bracket 30 to close the paper base plate 51 of the paper feed cassette to the upper pickup roller 52. The reference numeral 49 denotes an ADF spring provided on the lever bracket 30 to close the rubber plate 60 to the upper ADF roller 62.

The cam motor 10 is electrically connected to the microprocessor and fixedly mounted to one frame not shown in the drawing so as to be rotated according to the control signal. A worm 11 is provided at the shaft end of the cam motor 10, and the worm 11 is engaged with a gear train 12 arranged to transmit power to a cam shaft 20 to be described later.

The cam shaft 20 is coupled to the central portion thereof so that the cam 21 and the actuator 25 can be integrally rotated. In this case, the actuator 25 is formed of a large diameter semicircle and a small diameter semicircle. It is installed to be located between the light emitting portion and the light receiving portion so as to control the lower photosensor 26. In addition, the photosensor 26 is configured to be electrically connected to the built-in microprocessor to deliver a contracted signal. In addition, the cam 21 is provided with a constant protrusion 22 is configured so that the rear end of the lever bracket 30 to be described later to interlock. As a result, the cam 21 and the actuator 25 are rotated integrally and the rotation angle is sensed by the photosensor 26 to transmit the electrical signal contracted to the microprocessor, thereby the cam motor 10 described above. ) Can be controlled to drive.

The lever bracket 30 is formed in such a way that the upper part of the lever bracket 30 is bent by opening the flat member, and the lever bracket 30 has the cam 21 positioned at the rear upper part thereof, as described above. As the cam 21 rotates, the pin 46 is coupled to the auxiliary frame 17 so as to be interlocked up and down by the protrusion 22 of the cam.

The lever 40 is coupled with the pin 46 to the lever bracket 30 by extending a predetermined length thereof so as to be in contact with the paper bottom plate 51 of the paper cassette, which will be described later. The lever 40 is provided with brackets 43 at both rear sides thereof, and a cut surface 44 penetrates a predetermined area therebetween. On the other hand, the pin coupling portion of the lever 40 is provided with a torsion spring 48 so that the elastic force acts on the upper side, one side end of the torsion spring 48 is also provided on the bottom surface of the lever 40 through the incision surface (44) The other end is coupled to the pin 46 so as to span each of the bottom surface 31 of the lever bracket.

On the other hand, both sides of the lever 40 is provided with an ADF spring 49, the ADF spring 49 is one end thereof on the bottom surface 31 of the lever bracket, the other end rubber plate to be described later It is coupled to the lever 40 and the same pin 46 so as to span the bottom surface of each 60.

The paper feeding cassette 50 is provided with a paper bottom plate 51 rotatably installed up and down inside its front end, and a guide hole 53 through which the front end 41 of the lever passes through is provided on the front end wall. In the paper presence sensor 55, the through hole 54 is installed.

At this time, the paper presence sensor 55 is electrically connected to the built-in microprocessor, the microprocessor is electrically connected to the paper out indicator lamp (not shown) on the outside to determine the presence or absence of paper from the outside. It will be marked for you to know.

The rubber plate 60 is provided with a hinge hole 63 is pin-coupled to the rear end to be detachable to the surface of the ADF roller 62, and is transported on the transport path passing through the rubber plate 60. A detection sensor 65 which is operated by paper is provided. At this time, the detection sensor 65 is electrically connected to deliver a signal to the built-in microprocessor.

Referring to Figure 4 with respect to the operation sequence of the present invention by the above configuration as follows.

First, in the state as shown in FIG. 3B, when a feed command signal is input to the built-in microprocessor (ST step 1), the microprocessor is provided with a paper sheet from the paper presence sensor 55 installed on the bottom surface of the paper cassette 50. Receive a contracted signal according to the stateless state (ST step 2), and if there is no paper, apply power to an external display lamp to allow the user to load paper in the paper cassette 50 (ST step 3). ).

Subsequently, the microprocessor rotates the cam 21 and the actuator 25 which are integrally coupled to the shaft 20 by interlocking the cam shaft 20 through the cam motor 10 (ST). Step 4). At this time, the cam 21, as shown in Figure 3a, as the projection 22 is rotated to the bottom press the bottom surface 31 of the rear end of the lever bracket, the lever (30) installed in the lever bracket (30) 40) and the ADF spring 49 are integrally rotated to bring the paper bottom plate 51 and the rubber plate 60 into close contact with the pickup roller 52 and the ADF roller 62. On the other hand, the actuator 25 of FIG. 2 integrally coupled to the shaft 20 is rotated together with the cam 21 and becomes the opposite position as the first time, so that the photo sensor 26 located at the bottom detects this ( ST step 5), the microprocessor stops the cam motor 10 to maintain the above-mentioned close contact state (ST step 6).

Subsequently, the microprocessor drives the transfer motor 18 to feed the paper stacked in the paper feed cassette 50. At this time, the paper loaded in the paper feed cassette 50 is first separated into sheets by the pickup roller 52 to feed the paper between the ADF roller 62 and the rubber plate 60, and then the paper is fed in this way. The paper is secondarily separated by the ADF roller 62 and the rubber plate 60 to be supplied to the feed path (ST 7 step).

Subsequently, when the front end of the sheet to be fed is operated by the sensor 65 installed on the transport path (ST 8), the microprocessor is configured to enter a predetermined step, that is, the front end of the sheet sensor 65 After passing through the number of steps that can be bitten by the feed roller 19, the cam motor 10 is driven again (ST 9). At this time, as described above, the cam 21 and the actuator 25 of FIG. 2 are simultaneously linked, and as shown in FIG. 3B, the protrusion 22 of the cam is rotated to be positioned upward, such as the lever bracket 30 described above. The lever 40 installed on the lever bracket 30 and the ADF spring 49 are rotated integrally, and the paper bottom plate 51 and the rubber plate 60 are fixed by the pickup roller 52 and the ADF roller 62. Allow distance At this time, the actuator 25 of FIG. 2, which is integrally coupled to the shaft 20, is rotated together with the cam 21 to be rotated back to the initial position so that the photo sensor 26 detects this (ST 5). Step), the microprocessor stops the cam motor 10 to maintain the above-described spaced state (step ST 6).

Therefore, as described above, the paper is fed to the conveying roller 19 and transferred to the next printing step.

As can be seen from the above, in the automatic sheet feeding apparatus according to the present invention, when the leading end of the sheet to be fed is engaged with the feed roller 19, the microprocessor drives the cam motor 10 in accordance with a previously input rubber. By separating the plate 60 and the paper bottom plate 51 from the upper rollers 62 and 52 by a predetermined distance, the paper is not subjected to the transfer resistance by the pickup roller 52 and the ADF roller 62, It is engaged with the feed roller 19 and precisely conveyed.

Claims (4)

A pickup roller 52, an ADF roller 62, and a transfer roller 19 driven by the transfer motor 18 and supported by both sides of the frame, and a paper base 51 which is in close contact with the pickup roller 52. In the lower part of the automatic paper feeder including a paper feed cassette (50) provided with a paper presence sensor (55), and a rubber plate (60) in close contact with the ADF roller (62), which is fixed to one frame. A cam motor 10; The cam 21 rotated by the cam motor 10, the lever bracket 30 installed to be interlocked up and down according to the rotation of the cam 21, and the hinge bracket 30 to be rotated up and down together. An elevating means composed of a combined lever (40) and an ADF spring (49) for rotating the paper base plate (51) and the rubber plate (61) up and down; Automatic feeding device characterized in that it comprises a control means for controlling the rotation of the cam motor (10) and the transfer motor (18). According to claim 1, The lifting means, Cam (21) is provided in the central portion of the shaft 20 to be interlocked by the cam motor (10); A lever bracket 30 coupled to the cam part 22 by being rotated by being pushed up and down by the cam protrusion 22; A lever 40 installed on the lever bracket 30 to rotate the paper base 51 up and down; The automatic feeding device, characterized in that it comprises an ADF spring (49) installed on the lever bracket (30) for rotating the rubber plate (60) up and down. 2. The control apparatus according to claim 1, wherein the control means comprises: a sensing sensor (65) installed on a transport path to sense whether paper feeding is completed; Rotation angle sensing means for sensing a rotation angle of the cam shaft 20; And a microprocessor for controlling the cam motor (10) according to a pre-input based on an electrical signal transmitted from the sensing sensor (65) or the rotation angle sensing means. According to claim 3, The rotation angle detection means, the actuator consisting of a large diameter semi-circle and a small diameter semi-circle to be integrally rotated to the cam shaft (20); And a photosensor (26) controlled by the actuator (25) to transmit an electrical signal to the microprocessor.

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