KR20040020593A - A paper pick-up device for image forming aparatus - Google Patents

Abstract

PURPOSE: A paper pick-up device of an image forming system is provided to move a pick-up point based on the characteristic and kind of paper set by a printing command. CONSTITUTION: A paper pick-up device of an image forming system includes a pick-up roller(311), the first and second drivers(320,340), a pick-up bracket(310), and a loading/unloading means. The pick-up roller applies a rotation force to paper to transfer the paper in one direction. The first driver transmits the rotation force to the pick-up roller. The pick-up bracket has a free end that rotatably supports the pick-up roller and a fixed end that supports the first driver. The loading/unloading means up/down the free end of the pick-up bracket to load/unload the pick-up roller on/from paper. The second driver reciprocates the pick-up bracket to change a point at which the pick-up roller comes into contact with the paper according to characteristic of the paper loaded in a cassette.

Description

A paper pick-up device for image forming aparatus}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper pick-up device for picking up paper loaded in a cassette of an image forming machine such as a printer or a copying machine and transferring the paper to an image forming engine. It relates to a paper pick-up device of the image forming machine that can be moved in conjunction with the pick-up.

In general, an image forming machine such as a laser printer or a copying machine is configured to pick up printing paper loaded in a cassette which is detachably attached to a main body from a top end by a paper pick-up device, and to transfer it to the image forming engine unit.

As an example of a paper pick-up device of a conventional image forming machine, FIG. 1 schematically shows a paper pick-up device of a printer for a computer network. Referring to FIG. 1, the paper pick-up apparatus of the conventional image forming machine is installed inside the cassette mounting unit 101 provided in the image forming apparatus main body 100 as shown in the drawing, and sequentially picks up the paper loaded in the cassette 120. And a paper pick-up unit 200 for transferring to the forming engine unit 110.

The paper pick-up unit 200 includes a pickup roller 211 rotatably supported at a free end of the pickup bracket 210 so as to transfer paper in a direction orthogonal to the direction in which the cassette 120 is attached or detached. Loading / unloading means 200A for driving the pick-up roller 211 to be moved up and down with respect to the loaded paper upper surface by rotating the free end of the pickup bracket 210 up and down in association with the detachment of the cassette 120. And a driving means 200B for transmitting a rotational driving force to the pickup roller 211 in order to sequentially transport the paper loaded in the cassette 120.

The pickup roller 211 is installed to pick up the paper in a direction orthogonal to the detachable direction of the cassette 120. The cassette 120 has the printing paper picked up and transported to the image forming body 100 as shown. It is provided so that attachment or detachment may be carried out in the direction orthogonal to the direction to be discharged and the direction to be discharged. Here, reference numerals 121 and 201 of FIG. 1 are main components constituting the loading / unloading means 200A, 121 is a cam protrusion formed at the tip of the cassette 120, and 201 is the cam protrusion 121. The cam lever provided in the paper pick-up unit 200 to rotate by the interference of?).

The cam protrusion 121 rotates the cam lever 201 when the cassette 120 is mounted, thereby releasing the restrained state in which the pickup bracket 210 floats, thereby lowering the pickup roller 211 to lower the cassette ( Landed on the upper surface of the paper loaded on the 120 is to be in contact with.

On the other hand, according to the paper pick-up apparatus of the conventional image forming machine as described above, the pickup roller 211 is shown in Figure 2 regardless of the characteristics such as the thickness or surface roughness according to the type of paper loaded on the cassette 120 As described above, since it is installed to be able to contact the paper 1 at a specific point, that is, a point spaced apart from the front end of the paper 1 by a predetermined distance X, the paper 1 is rotated by the pickup roller 211. ) Is pushed up to the inclined resistance plate (120a) of the cassette 120 and the slip or the cassette (120) that is often conveyed in a state in which a plurality of sheets are overlapped due to the type of paper and its characteristics There is a problem that a jam occurs in which paper is jammed between the pickup rollers 211.

The present invention was created to improve the problems of the paper pick-up device of the conventional image forming machine as described above, and an object of the present invention is to move the pick-up point in accordance with the characteristics and type of paper set by the print command. It is an object of the present invention to provide a paper pick-up apparatus of an image forming machine capable of being picked up.

1 is a schematic perspective view showing a paper pick-up apparatus of a conventional conventional image forming machine,

2 is a side view schematically showing a conventional paper pick-up device shown in FIG.

3 is a schematic perspective view illustrating a paper pick-up device of an image forming machine according to the present invention;

4 is a schematic perspective view showing the paper pick-up device of the image forming machine according to the present invention;

5 is a plan view schematically showing a paper pickup apparatus of the image forming machine according to the present invention;

6 and 7 are schematic perspective views showing the main components of the paper pickup apparatus according to the present invention, respectively;

8 is a schematic side view showing for explaining the operating state of the paper pick-up apparatus of the image forming machine according to the present invention.

<Description of Symbols for Major Parts of Drawings>

100. Imager main body 101 ... Cassette mounting

110 ... imaging engine unit 120 ... paper cassette

121.Camping projection 300 ... Paper pickup unit

310 ... Pickup Bracket 311 ... Pickup Roller

312 ... Jump jaw 320 ... First driving means

321 1st drive motor 323 Belt pulley

326 ... gear 330 ... locking / unlocking means

331 Cam lever 333 Lift lever

340 ... 2nd drive means 341 ... transfer frame

342 Rack member 343 Pinion

345.2nd drive motors 346, 347 ... guide bar

In order to achieve the above object, the paper pick-up device of the image forming apparatus according to the present invention is a paper pick-up unit installed in the main body to pick up the paper loaded in the cassette detachably installed in the main body of the image forming machine and to transfer it to the image forming engine unit. A paper pick-up apparatus of an image forming machine, the paper pick-up unit comprising: a pickup roller for transferring the paper in one direction by transmitting a rotational driving force in contact with an upper surface of the paper loaded in the cassette; First driving means for transmitting a rotational driving force to the pickup roller; A pickup bracket having a free end up and down to support the pickup roller in a rotatable state, and the first driving means supported on the fixed end side; Loading / unloading means for loading / unloading the pickup roller onto paper by up / down the free end of the pickup bracket in association with the detachment of the cassette; And second driving means for linearly reciprocating the pickup bracket to change the point where the pickup roller contacts the paper according to the characteristics of the paper loaded in the cassette.

In the paper pick-up apparatus of the image forming apparatus according to the present invention having the configuration as described above, the first driving means includes the first driving motor provided on the pickup bracket and the rotation driving force output from the first driving motor. It is preferably configured to include a power transmission means for delivering to the pickup roller.

According to one aspect of the invention, the power transmission means, preferably comprises a belt pulley provided on the pickup bracket to be connected to the output shaft of the first drive motor and the rotation shaft of the pickup roller.

According to another aspect of the invention, the power transmission means, a drive gear installed on the output shaft of the first drive motor, driven gears provided on the rotation shaft of the pickup roller and a plurality of drive gears provided between the drive gear and the driven gear It may also be configured to include a connecting gear.

Meanwhile, according to the present invention, the loading / unloading means may include a cam protrusion provided to protrude from one side of the cassette, a support frame installed on the cassette mounting portion of the main body, and the cam protrusion when the cassette is attached or detached. A cam lever provided to be unidirectionally elastically biased to the support frame to rotate in an interfering manner, a pickup bracket installed on the support frame having a free end up and down supported by the pickup roller in a rotatable state, and a free end of the pickup bracket. And a locking arm connected to the cassette to elastically bias the cassette and interlocked with the cam lever to selectively lock / unlock the pickup bracket.

The second driving means may include: a transfer frame supporting a fixed end of the pickup bracket and installed in the pickup unit main body in a linear reciprocating state; It is preferably configured to include; a conveying means for moving the conveying frame linearly reciprocating.

In addition, the transfer means, the rack member provided in the transfer frame; A pinion engaged with the rack member; And a second drive motor installed in the pickup unit main body to rotationally drive the pinion.

Hereinafter, a paper pick-up apparatus of an image forming machine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 3, the paper pick-up apparatus of the image forming apparatus according to the present invention picks up the paper loaded in the cassette 120 detachably installed in the cassette mounting unit 101 of the image forming apparatus main body 100, as shown. And a paper pick-up unit 300 embedded in the main body 100 so as to be transferred to the image forming engine 110. Here, reference numeral 121 in FIG. 3 denotes a cam protrusion formed at the front end of the cassette 120, and 331 denotes a frame 301 of the paper pickup unit 300 to rotate by the interference of the cam protrusion 121. FIG. The cam lever is installed to be elastically biased in one direction.

As shown in FIGS. 4 and 5, the paper pick-up unit 300 contacts the upper surface of the paper loaded in the cassette 120 and transmits rotational driving force to transfer the paper in one direction. 311, a first driving means 320 for transmitting a rotational driving force to the pickup roller 311, and a free end up and down supported by the pickup roller 311 in a rotatable state, and on the fixed end side. The pick-up bracket 310 on which the first driving means 320 is supported and the free end of the pick-up bracket 310 are connected to each other in accordance with the detachment of the cassette 120 to cover the pick-up roller 311. Loading / unloading means 330 for loading / unloading the upper surface and changing the contact point where the pickup roller 311 is landing on the paper according to the type and characteristics of the paper loaded in the cassette 120 In order to straighten the pickup bracket 310 Supporting the second driving means 340 and the, above-described components to the reciprocating move to is characterized in that it comprises a frame 301 which is installed to be built in the image-forming body 100.

According to the present invention, the first driving means 320 is rotated output from the first driving motor 321 and the first driving motor 321 installed in the pickup bracket 310 as shown in FIG. It is preferably configured to include a power transmission means built in to transfer the driving force to the pickup roller (311).

According to one aspect of the invention, the power transmission means, preferably comprises a belt pulley 323 is installed to be connected to the output shaft of the first drive motor 321 and the rotary shaft of the pickup roller (311).

According to another aspect of the present invention, the power transmission means, at least one drive gear 324 and the pickup roller 311 is installed to be connected to the output shaft of the first drive motor 321 or the belt pulley 323. It may be configured to include a driven gear 325 and a plurality of connecting gears 326 provided between the drive gear 324 and the driven gear 325 installed on the rotating shaft of the).

According to the present invention, the loading / unloading means 330 is one direction to the frame 301 of the paper pick-up unit 300 to rotate by the interference of the cam protrusion 121 as shown in FIG. 7. Cam lever 331 is installed so as to be elastically biased, and the lifting lever 333 is installed so as to interlock with the cam lever 331 and the lever shaft 332 so as to restrain the lifting state of the pickup bracket (310). do.

The free end of the lifting lever 333 is selectively caught by the locking jaw 312 protruding to one side of the pickup bracket 310 to restrain the lifting movement of the pickup bracket 310.

Therefore, the cam protrusion 121 rotates the cam lever 331 when the cassette 120 is mounted, and the lever shaft 332 rotates in accordance with the rotation of the cam lever 331 so that the lifting lever 333 is rotated. ), And by releasing the restrained state so that the pick-up bracket 310 is floated, the pick-up roller 211 descends and is brought into contact with the top surface of the paper loaded on the cassette 120. .

On the other hand, the second driving means 340, as shown in Figures 3 to 6 support the fixed end of the pickup bracket 310, the linear reciprocating movement to the frame 301 of the pickup unit 300 It is preferably configured to include a transfer frame 341 installed in a possible state, and a transfer means for linearly reciprocating the transfer frame 341.

In addition, the transfer means, the pickup unit to rotate the rack member 342 provided in the transfer frame 341, the pinion 343 and the pinion 343 meshed with the rack member 342 A pair of guide bars provided to protrude to both sides of the body of the pickup bracket 310 to allow a linear reciprocating motion of the second driving motor 345 and the pickup bracket 310 installed in the frame 301 of (300). As shown in FIG. 4, the pickup units 300 are disposed between the pickup brackets 310 so that the guide bars 346 and 347 are inserted to allow the linear reciprocating sliding movement. It comprises a pair of guide rails (301a, 301b) formed in the frame 301 of.

Hereinafter, an operation state of the paper pickup apparatus according to the present invention having the configuration as described above will be described in detail with reference to the accompanying drawings.

The paper pick-up apparatus of the image forming apparatus according to the present invention is capable of picking up by picking up the paper pick-up point in accordance with the characteristics and type of the paper set by the print command, the cassette mounting portion 110 of the main body 100 When the cassette 120 on which paper is loaded is mounted, the cam lever 331 is rotated upward by the cam protrusion 121 provided at the front end of the cassette 120 as shown in FIG. 7. At the same time the lifting lever 333 is rotated downward.

Accordingly, the pickup bracket 310 is constrained to be lifted from the bottom of the cassette 120 as the locking jaw 312 provided at one side thereof is released by the locking pin of the lifting lever 333. As a result, the pickup roller 311 is down-loaded to come into contact with the top surface of the paper loaded on the cassette 120. At this time, the pick-up bracket 310 is elastically biased downward by the tension force of the coil spring installed at the front end thereof, so that the pick-up roller 311 presses the upper end surface of the paper loaded on the cassette 120 with a constant tension force. In contact with the state.

As described above, the pickup roller driving means 320 is operated by the sequential control operation of the main controller in the state in which the pickup roller 311 is downloaded. That is, the driving force of the driving motor 321 is transmitted to the pickup roller 311 by a power transmission means such as a belt pulley 323 and a plurality of connecting gears 326, so that the pickup roller 311 is The paper loaded in the cassette 120 is sequentially transferred to the image forming engine 110 by the rotation driving force.

On the other hand, according to a feature of the present invention, by the user inputs the information according to the characteristics and type of the printing paper by the operation of the control panel (not shown), the information is transferred to the main controller (not shown), so that the paper pickup process Before the second drive means 340 is driven, the second drive means 340 linearly reciprocates the pickup bracket 310 according to the characteristics and type of paper as shown in FIG. The paper can then be picked up at the appropriate pick up point.

That is, the second driving motor 345 is driven in the forward or reverse direction based on the input information according to the characteristics and type of the printing paper by the control signal of the main controller (not shown). Accordingly, the pinion 343 provided on the output shaft of the second driving motor 345 rotates to linearly reciprocate the rack member 342 of the transfer frame 341 connected to the pickup bracket 310. The bars 346 and 347 slide along the guide rails 301a and 301b to move the pickup bracket 310 forward or backward. At this time, the pickup bracket 310 is freely separated between the points A and B spaced apart by a predetermined distance (X, Y) from the leading end of the paper 1, as shown in Figure 8 according to the characteristics and type of printing paper It is controlled to be set at a specified point while moving, and then the pickup roller 311 is loaded to be able to contact the paper 1 so as to pick up the paper.

Therefore, according to the paper pick-up apparatus according to the present invention, when the paper 1 is pushed up to the inclined resistance plate 120a of the cassette 120 by the rotation driving of the pickup roller 311, the paper type or the Since it is possible to suppress a slip phenomenon that is often generated according to characteristics, and to prevent the feeding of a plurality of sheets in an overlapped state, the sheet is sandwiched between the cassette 120 and the pickup roller 211. Jam can be suppressed.

According to the paper pick-up device of the image forming machine according to the present invention as described above, in consideration of the characteristics of differentiation such as thickness and surface roughness according to the type of printing paper, picking up by moving the printing paper pickup point to cooperate with it By doing so, it is possible to prevent slips, heavy feeding and jams during printing of paper sheets, and to obtain an effect of significantly improving paper pick-up and conveying accuracy.

Although the present invention has been described with reference to a preferred embodiment shown in the drawings, which are merely exemplary, and the present invention is not limited to the above-described embodiments and various modifications therefrom to those skilled in the art. And other equivalent embodiments will be possible.

Claims (7)

In the paper pick-up device of the image forming machine comprising a paper pick-up unit installed in the main body to pick up the paper loaded in the cassette detachably installed in the image-forming machine main body and to transfer it to the image forming engine unit, the paper pick-up unit, A pick-up roller for transferring the paper in one direction by transmitting a rotational driving force in contact with the top surface of the paper loaded in the cassette; First driving means for transmitting a rotational driving force to the pickup roller; A pickup bracket having a free end up and down to support the pickup roller in a rotatable state, and the first driving means supported on the fixed end side; Loading / unloading means for loading / unloading the pickup roller onto paper by up / down the free end of the pickup bracket in association with the detachment of the cassette; And And second driving means for linearly reciprocating the pickup bracket to change the point where the pickup roller contacts the paper according to the characteristics of the paper loaded in the cassette. Device. The method of claim 1, wherein the first driving means, And a first transmission motor provided on the pickup bracket, and a power transmission means for transmitting the rotation driving force output from the first driving motor to the pickup roller. The method of claim 2, wherein the power transmission means, And a belt pulley installed on the pickup bracket so as to be connected to the output shaft of the first driving motor and the rotation shaft of the pickup roller. The method of claim 2, wherein the power transmission means, And a drive gear installed on the output shaft of the first drive motor, a driven gear installed on the rotary shaft of the pickup roller, and a plurality of connecting gears installed between the drive gear and the driven gear. Device. The method of claim 1, wherein the loading / unloading means, A cam lever provided to protrude from one end of the cassette, a support frame installed on the cassette mounting portion of the main body, and a cam lever installed to elastically bias in one direction to the support frame so that the cassette rotates when the cassette is attached or detached. And a pickup bracket installed on the support frame having a free end up and down to support the pickup roller in a rotatable state, an elastic body elastically biasing the free end of the pickup bracket toward the cassette, and the cam lever. And a locking arm connected to selectively lock / unlock the pickup bracket. The method of claim 1, wherein the second driving means, A transport frame supporting a fixed end of the pickup bracket and installed in the pickup unit body in a linear reciprocating state; And transfer means for linearly reciprocating the transfer frame. According to claim 6, The transfer means, A rack member provided in the transfer frame; A pinion engaged with the rack member; And And a second drive motor installed in the pickup unit main body to rotationally drive the pinion.