KR20040078016A - Paper feeding device for printer - Google Patents

Abstract

PURPOSE: A paper feeding apparatus for a printer is provided to allow a user to easily remove papers jammed between feed rollers by moving an idle gear engaged with the feed rollers. CONSTITUTION: A paper feeding apparatus for a printer includes a pickup roller(210), an LF motor(220), a gear train, a gear moving unit, and a feed roller(250). The pickup roller(210) picks up papers stacked on a paper guide(110) so as to transfer the papers toward the feed roller(250). The pickup roller(210) is installed on a pickup roller shaft which is rotatably supported by a frame(101). The LF motor(220) generates driving force for driving the pickup roller(210) and the feed roller(250). The driving force of the LF motor(220) is transferred to the pickup roller(210) and the feed roller(250) through the gear train.

Description

Paper feeder for printers {PAPER FEEDING DEVICE FOR PRINTER}

The present invention relates to a printer, and more particularly, to a paper feeding device for a printer that can easily remove the paper jam occurs.

In general, a printer is an office device that attaches a developer such as ink or toner onto a sheet of paper, and outputs a desired image, and includes a paper feeding device for feeding the sheet to the printhead.

1 shows a conventional inkjet printer and a paper feeding device thereof as an example for a printer. As shown in FIG. 1, a paper feeding device 100 of a conventional inkjet printer includes a paper guide 110 on which paper is loaded, and a paper guide. In order to line feed the pick-up roller 120 installed in the frame 101 and the paper picked up by the pick-up roller 120 to the print head side in order to pick up the sheets stacked on the sheet 110 in a single sheet. The feed roller 130 installed in the frame 101, the LF motor 150 for generating a driving force for driving the pickup roller 120 and the feed roller 130, and the driving force generated in the LF motor 150 And a gear train 160 for supplying the pickup roller 120 and the feed roller 130.

In the conventional printer paper feeder 100 having the above configuration, when a print job is started, the pickup roller 120 receives a driving force generated from the LF motor 150 through the gear train 160 to receive the paper guide 110. Pick up a sheet of paper loaded in the printer. After the paper pick-up, the LF motor 150 changes the rotation direction, whereby the feed roller 130 rotated in the paper feed direction transfers the picked paper to the printhead side.

On the other hand, if the paper jam occurs due to damage or curl of the paper while the paper is in contact with the pickup roller 120 and / or the feed roller 130 during the process of feeding the paper to the ink cartridge side, the user The paper is pulled in the opposite direction of the transfer to remove the paper jammed in the pickup roller 120 and / or feed roller 130.

However, in the conventional paper feeder as described above, the pickup roller gear 162 coupled to the pickup roller 120 is engaged with other gears, and the pickup roller 120 is also fed by the gear train 160. Since it is connected to the roller 130, the pickup roller 120 is not easily rotated. Therefore, it is not easy for the user to pull out the paper that is in close contact with the pickup roller 120.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a printer paper feeder that can easily pull out the paper jammed in the feed roller when paper jam occurs.

1 is a perspective view schematically showing the configuration of a conventional paper feeding device for a printer;

Figure 2 is a perspective view schematically showing a paper feeding device for a printer according to a preferred embodiment of the present invention,

3 is a side view showing a paper feeding device for a printer according to a preferred embodiment of the present invention shown in FIG.

FIG. 4 is a front view showing an essential part of a configuration of a paper feeding device for a printer according to a preferred embodiment of the present invention shown in FIG.

5 is a plan view showing a main configuration of a paper feeding device for a printer according to another embodiment of the present invention, and

6 is a plan view showing a main configuration of a paper feeding device for a printer according to another embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

200; Paper Feeding Unit 210; Pick-up Roller

220; LF motor 230; gear train

231; LF motor gear 232; reduction gear

233; connecting gear 235; swing gear

236; Pickup Roller Gear 237; Feed Roller Gear

238; kids gear 241; gear shifting motor

242; screw rods 243, 283, 292; levers

250; feed roller 260; gear guide shaft

270; friction roller 281; pinion motor

282; pinion gear 291; spring

Printer feeder according to the present invention for achieving the above object, the printer feeder, the motor; A feed roller which transfers paper by receiving a driving force from the motor; An idle gear movably installed to be selectively geared with a feed roller gear coupled to the feed roller; And gear moving means for selectively moving the idle gear.

According to this, when the paper jam occurs, the idle gear is moved to make the feed roller idle, and the paper jammed in close contact with the feed roller can be easily pulled out.

In the present invention having the above configuration, it is preferable that the idle gear is installed to be slidable along the gear guide shaft installed in the printer frame.

And, the gear shifting means, a lever for pressing the idle gear; A screw rod having one end spirally coupled to the lever; And a gear moving motor for rotating the screw rod, wherein the lever slides the idle gear by one end of the lever being moved along the screw rod by the rotation of the screw rod.

In addition, the idle gear is elastically supported by a spring installed on the gear guide shaft, the gear shifting means includes a lever that is pushed and moved by a carrier linearly moving in the axial direction of the gear guide shaft, the carrier is It is preferable that the lever moves the idle gear by pressing the lever, and when the pressing force of the lever is released, the idle gear is returned to the initial position by the elastic force of the spring.

In addition, the gear shifting means, a lever for pressing the idle gear; A pinion motor to which the pinion gear is rotatably coupled; And a rack gear coupled to the other end of the lever to engage with the pinion gear, wherein one end of the lever is moved by moving the rack gear by rotation of the pinion gear.

In addition, during the movement of the idle gear, the motor is preferably rotated by a predetermined angle to facilitate the movement of the idle gear.

Hereinafter, a paper feeding device for a printer according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. For reference, in describing the present invention, the same reference numerals refer to the same parts as those in the related art.

2 is a perspective view schematically showing a printer paper feeder according to a preferred embodiment of the present invention, Figure 3 is a side view showing a paper feeder according to a preferred embodiment of the present invention shown in Figure 2, Figure 4 Fig. 5 is a front view showing a main configuration of a printer feeder according to a preferred embodiment of the present invention shown in FIG. 2, FIG. 5 is a plan view showing a main configuration of a feeder for a printer according to another embodiment of the present invention, and FIG. Fig. 1 is a plan view showing the main configuration of a paper feeding device for a printer according to another embodiment of the present invention.

2 and 3, the printer paper feeding device 200 according to a preferred embodiment of the present invention, the pickup roller 210, LF motor 220, gear train 230, gear shift And a means 240 and a feed roller 250.

The pickup roller 210 is for picking up sheets of paper loaded in the paper guide 110 into the feed roller 250 side and installed on the pickup roller shaft 211 rotatably supported by the frame 101. .

The LF motor 220 generates a driving force for driving the pickup roller 210 and the feed roller 250, and is controlled by the control device on / off and forward / reverse rotation.

The gear train 230 is to transfer the driving force generated in the LF motor 220 to the pickup roller 210 and the feed roller 250 to the LF motor gear 231 is coupled to the LF motor 220, LF motor gear 231 is engaged with the reduction gear 232, the reduction gear 232 is engaged with the coupling gear 233 is integrally coupled to the center of the connection gear 233 by the swing arm 234 Swing gear 235 is installed so as to be able to swing a predetermined angle, the pickup roller gear 236 is coupled to the pickup roller shaft 211 to be selectively geared to the swing gear 235, the feed roller 250 is installed A feed roller gear 237 coupled to the feed roller shaft 251 and a coupling gear 233 and / or feed roller gear 237 while sliding on the gear guide shaft 260 installed on the frame 101. An idle gear 238 is optionally geared. The idle gear 238 has a first bracket 261 sliding on the gear guide shaft 260 integrally with the idle gear 238 at an outer side thereof and spaced at a predetermined interval, whereby the idle gear 238 and Grooves 262 are formed between the first brackets 261. A second bracket 263 is installed at the end of the gear guide shaft 260 to prevent the idle gear 238 from being separated from the gear guide shaft 260.

The driving force generated in the LF motor 220 by the configuration of the gear train 230 is LF motor gear 231, reduction gear 232, coupling gear 233, swing gear 235 and pickup roller gear ( 236 is transmitted to the pickup roller shaft 211 and the pickup roller 210, the transmission is interrupted by the swinging movement of the swing gear 235 through the swing arm 234. In addition, the driving force generated in the LF motor 220 is the feed roller shaft 251 and the feed roller 250 through the reduction gear 232, the connecting gear 233, the idle gear 238 and the feed roller gear 237. Is transmitted to, and the transmission is interrupted by the sliding movement of the idle gear 238.

The gear moving means 240 is for sliding the idle gear 238 on the gear guide shaft 260 and includes a gear moving motor 241, a screw rod 242, and a lever 243. The screw rod 242 is installed on the gear movement motor 241 so as to be rotated by the driving of the gear movement motor 241, and the spiral coupling portion 243a of one end of the lever 243 is spirally formed on the outer circumferential surface of the screw rod 242. Combined. The other end of the lever 243 is inserted into the groove 262 between the idle gear 238 and the first bracket 261. Accordingly, when the screw rod 242 is rotated, one end of the lever 243 moves in the axial direction along the outer circumferential surface of the screw rod 242, and the other end of the lever 243 moves the idle gear 238 to the gear guide shaft ( Slid on 260. Here, the lever 243 is moved along the guide rail 244 in a state where the guide protrusion 243b provided at one side thereof is supported by the guide rail 244 installed in the gear movement motor 241.

The feed roller 250 is installed on the feed roller shaft 251 rotatably installed in the frame 101 to move the paper picked up by the pickup roller 210 toward the print head. The feed roller 250 is in close contact with the friction roller 270. When the paper is picked up, the feed roller is rotated in the opposite direction of the paper feed, and the paper reaches between the feed roller 250 and the friction roller 270 so that the tip is aligned. The paper is fed while being rotated in the feed direction.

Hereinafter, the operation of the printer paper feeder 200 according to the present invention will be described.

As shown in FIG. 3, when the LF motor 220 is driven and the LF motor gear 231 rotates counterclockwise, the reduction gear 232 and the reduction gear 232 meshed with the LF motor gear 231 are rotated. Connecting gear 233 integrally coupled to one side of the) is rotated in the clockwise direction. At this time, the swing gear 235 supported by the swing arm 234 and engaged with the connecting gear 233 is engaged with the pickup roller gear 236, whereby the pickup roller 210 is rotated clockwise while Pick up the paper loaded in the guide 110 in a sheet. In addition, the idle gear 238 meshed with the connecting gear 233 rotates the feed roller gear 237 clockwise while being rotated counterclockwise. Therefore, when the paper picked up by the pickup roller 210 comes into contact with the pickup roller 210 which is reached between the feed roller 250 and the friction gear 270 and is being rotated backward, the ends of the paper are aligned side by side. After the paper is aligned, the rotation direction of the LF motor 220 is changed so that when the LF motor gear 231 is rotated clockwise, the swing arm 234 is rotated counterclockwise while the swing gear 235 and the pickup roller gear 236 are rotated. Connection drops. In addition, the feed roller 250 is rotated in the counterclockwise direction to move the aligned sheet to the print head side.

On the other hand, when paper jam occurs, the LF motor 220 is stopped, the pickup roller 210 and the feed roller 250 stops rotating, the gear movement motor 241 is driven. As shown in FIG. 4, when the gear movement motor 241 is driven and the screw rod 242 is rotated, the lever 243 moves toward the second bracket 263 while being supported by the guide rail 244. 1 Push the bracket (261). At the same time, the LF motor 220 (see FIG. 3) is temporarily driven so that backlash is generated between the idle gear 238 and the feed roller gear 237 and between the idle gear 238 and the connecting gear 233. do. As a result, friction is reduced between the idle gear 238, the feed roller gear 237, and the connecting gear 233, and the idle gear 238 smoothly slides. When the lever 243 pushes the first bracket 261, the idle gear 238 slides toward the second bracket 263 together with the first bracket 261 and is separated from the connecting gear 233 and the feed roller gear 237. do.

After the idle gear 238 is separated from the connecting gear 233 and the feed roller gear 237, the gear shift motor 241 is stopped. At this time, since the feed roller 250 is in the idle state and the pickup roller 210 is disconnected from the feed roller 250, the feed roller 250 is closely attached to the feed roller 250 and the pickup roller 210, or the pickup roller 210. Only the sheets of paper that are in close contact can be easily removed by being pulled by the user. After the paper is removed, the gear shifting motor 241 reversely rotates and presses the lever 243 to return the idle gear 238 to an initial state where the idle gear 238 engages with the connecting gear 233 and the feed roller gear 237. Is stopped.

In the above description, the idle gear 238 is separated from both the connecting gear 233 and the feed roller gear 237. However, the idle gear 238 is two gears of the connecting gear 233 or the feed roller gear 237. The present invention can be established even if it deviates from either.

5 shows a main configuration of a paper feeding device for a printer according to another embodiment of the present invention. As shown in FIG. 5, the printer paper feeding device according to another embodiment of the present invention is the same as the printer paper feeding device according to the preferred embodiment except for the gear moving means 280.

The gear shifting means 280 includes a pinion motor 281, a pinion gear 282, and a lever 283. The pinion gear 282 is coupled to the pinion motor 281 so as to be rotated by the drive of the pinion motor 281, and the lever 283 is installed to be pivotable by the hinge shaft 284 on the second bracket 263. One end of the lever 283 has a rack gear portion 283a engaged with the pinion gear 282, and the other end of the lever 283 is provided in the groove 262 between the idle gear 238 and the first bracket 261. Is inserted.

As in the preferred embodiment, when a paper jam occurs, the LF motor 220 (see FIG. 3) is stopped and the pinion motor 281 is driven to rotate the pinion gear 282 counterclockwise. At this time, while the rack gear portion 283a of the lever 283 engaged with the pinion gear 282 is moved, the lever 243 is rotated clockwise about the hinge axis 284. At the same time, the other end of the lever 283 presses the first bracket 261 toward the second bracket 263 so that the idle gear 238 is released from the connecting gear 233 and the feed roller gear 237. It is slidably moved toward the second bracket 263 on the guide shaft 260. When the idle gear 238 is separated from the feed roller gear 237 and the feed roller 250 (see FIG. 3) is in the idle state, the paper is pulled out by the user and removed. After the paper is removed, the pinion gear 282 is removed. ) Is rotated clockwise by pinion motor 281 and idle gear 238 is returned to its initial state by lever 283.

6 shows a paper feeding device for a printer according to another embodiment of the present invention.

As shown in FIG. 6, the paper feeding device for a printer according to another embodiment of the present invention does not include a separate driving device as the gear moving means 290, and includes a carrier reciprocated along the guide rod 102. The idle gear 239 is slid on the gear guide shaft 260 using 170. A spring fixing bracket 264 is installed at an end of the gear guide shaft 260, and a spring 291 is elastically supporting one side of the idle gear 239 between the spring fixing bracket 264 and the idle gear 239. It is interposed. The other side of the idle gear 239 comes into contact with one end of the lever 292 which is installed to be pivotable on the frame 101 (see FIG. 3).

In the paper feeding apparatus of the printer according to another embodiment of the present invention having the above configuration, when the paper jam occurs, the LF motor 220 (see FIG. 3) is stopped. Then, the carrier 170 moves out of the printing area and moves along the guide rod 102 to press the lever 292 so that the idle roller 239 slides toward the spring fixing bracket 264. When the idle roller 239 overcomes the elastic force of the spring 291 and slides along the gear guide shaft 260 to be separated from the connecting gear 233 (see FIG. 3) and the feed roller gear 237 (see FIG. 3), the carrier ( 102 is stopped and the idle roller 239 maintains the disconnected state of the connection gear 233 and the feed roller gear 237. When the paper causing the paper jam is removed, the carrier 103 returns to the printing area along the guide rod 242 and the idle gear 239 is connected to the connecting gear 233 and the feed roller by the elastic restoring force of the spring 291. The initial position is engaged with the gear 237. A fixing member 265 is installed at one side of the gear guide shaft 260 so that the idle roller 239 accurately stops at an initial position.

According to the present invention as described above, when the paper jam occurs and the paper is stuck in the state in close contact with the feed roller, the feed roller by moving the idle gear geared with the feed roller gear to transfer power to the feed roller Can be placed in an idle state. Therefore, the paper adhered to the feed roller can be easily pulled out and removed.

While the invention has been shown and described with respect to preferred embodiments for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Claims (6)

In the paper feeder for the printer, motor; A feed roller which transfers paper by receiving a driving force from the motor; An idle gear movably installed to be selectively geared with a feed roller gear coupled to the feed roller; And And a gear moving means for selectively moving the idle gear. The method of claim 1, The idle gear is a paper feeding device, characterized in that the sliding movement is installed along the gear guide shaft is installed in the printer frame. The method of claim 2, wherein the gear shifting means, A lever for pressing the idle gear; A screw rod having one end spirally coupled to the lever; And It includes; a gear moving motor for rotating the screw rod, And the lever slides the idle gear by one end of the lever being moved along the screw rod by the rotation of the screw rod. The method of claim 2, The idle gear is elastically supported by a spring installed on the gear guide shaft, The gear shifting means includes a lever that is pressed and moved by a carrier linearly moving in the axial direction of the gear guide shaft, The lever moves the idle gear by the carrier pressing the lever, and when the pressing force of the lever is released, the idle gear is returned to the initial position by the elastic force of the spring. . The method of claim 2, wherein the gear shifting means, A lever for pressing the idle gear; A pinion motor to which the pinion gear is rotatably coupled; And And a rack gear coupled to the other end of the lever to engage with the pinion gear. And one end of the lever moves as the rack gear moves by the rotation of the pinion gear. The method of claim 1, When the idle gear is moved, the motor feeding device for the printer, characterized in that the motor rotates a predetermined angle to facilitate the movement of the idle gear.