KR200151930Y1 - Device preventing reverse-feeding of paper for ink-jet printer - Google Patents

Abstract

This invention has been improved to prevent paper jams caused by the reverse conveying of paper to be ejected due to the reverse rotation drive to draw the next paper to be printed out when the printed paper is ejected. The present invention relates to an apparatus for preventing the reverse feed of paper of an inkjet printer, the feed roller receiving power of the main stationary motor, the pulley contacting the feed roller to transmit power to the discharge roller, and the tension applied to the pulley upward. Power spring provided with a spring shaft and a discharge roller that is discharged by receiving the power by the pulley and the friction star wheel is installed on the upper side, the power short circuit provided to one side of the pulley during the reverse rotation drive of the main stationary motor By the means, the pulley is moved to the lower side and the reverse rotation power of the feed roller is transferred to the discharge roller. The power shorting means of the pulley includes a lock spring which transmits power only when the pulley is reversely rotated, a cam that is rotated by the lock spring, and the cam is caught and pulled downward. The stopper is configured to be movable, so that the pulley is lowered during the reverse rotation of the printer so that the printed paper is not conveyed as the output roller is stopped because it is not powered.

Description

Paper backward feed prevention device of inkjet printer

The present invention is improved to prevent the paper jam caused by the reverse conveying of the paper to be discharged due to the reverse rotation drive to draw the next paper to be printed out when the printed paper is discharged. The present invention relates to a paper back feed preventing device of an inkjet printer.

In general, the inkjet printer is configured to supply the paper P of the paper feeder unit 1 by the paper feed roller 1a as shown in FIG. 1, and the paper fed in this way is the feed roller of the paper feeder unit 2. It is conveyed by 2a and friction roller 2b for printing.

In addition, by the ink cartridge (3b) attached to the carriage (3a) of the printing device unit 3 to be transferred to the left and right, one row is printed on the paper, the paper thus printed is passed through the base frame (4) The discharge roller 5a and the friction star wheel 5b of the discharge device unit 5 are discharged.

As shown in FIG. 3, the gears 7, 7 ′ and 7 ″ are linked to each other by the power of the main stationary motor 6 to rotate the feed roller 2a as shown in FIG. 3. From 2a, through the pulley 8 provided by the spring shaft 8a, the discharge roller 5a is rotated as a frictional force.

Accordingly, when the main stationary motor 6 is driven forward, the feed roller 2a and the discharge roller 5a are rotated forward in the counterclockwise direction in FIG. 3 so that the paper p is fed forward, and vice versa. When the motor 6 is driven in reverse rotation, the paper is conveyed backward.

Although the drawing is omitted in the feeding roller 1a of the paper feeding unit 1, the main reverse motor 6 and the gear (not shown) are connected to the forward and reverse rotations.

In the paper feeding, printing, and discharging process, the normal feed motor is operated by the forward rotation driving of the main reverse motor (6).

Specifically, the paper p printed by the printing device unit 3 has its front end entered between the discharge roller 5a and the friction star wheel 5b of the delivery device unit 5 and discharged by their pressure. To become a process.

However, in some cases, when there is an obstacle in front of the paper discharge, or when the paper is not properly discharged due to low pressure, the paper feed roller unit 1 performs a reverse rotation operation to draw the next sheet. In the reverse rotation operation (5a), there is a case where the printed paper p is again conveyed into the printer.

That is, when one sheet of paper is printed and discharged by the discharge device unit 5, the main reverse motor 6 is reversely rotated at the same time. It is to align the paper leading end in the paper feeder unit 1, and the paper p of the cassette 9 enters the feed roller 2a and the friction roller 2b at the beginning of the feed roller 1a by forward rotation. At the same time, as the reverse rotation drive of the main stationary motor 6 is instantaneously operated, the feed roller 2a is instantaneously reversed, so that the front end of the paper p is exactly matched to the feeding roller and the friction roller. This is to ensure that the paper is fed in a straight line without being stiff.

If the paper leading edge is not supplied in a straight line and is fed to the paper feeder unit 2 as a result, the paper is printed in a stiff state. As a result, the reverse rotation operation is instantaneously rotated again after each new paper is fed. It is supposed to work.

As a result, when the printer executes the reverse rotation operation as described above, all the driving units are reverse rotated, and the discharge roller 5a also rotates reversely. If the state is in the state of being stuck between the discharge roller (5a) and the friction star wheel (5b) by the reverse direction is fed back into the printer. At this time, the set will operate abnormally, not only the printed paper can be used but also paper jam will occur.

The present invention is to solve the conventional problems as described above, by the reverse rotation operation for the straight line alignment of the paper leading end at the time of feeding the new paper in the printer is not discharged again without the paper is discharged again paper jam is generated The purpose is to be able to prevent it in advance.

In order to achieve the above object, the present invention provides a feed roller receiving power of a main stationary motor, a pulley contacting the feed roller to transmit power to the discharge roller, and a tension force applied to the pulley upward. Power spring means for having a spring shaft to be discharged by receiving the power by the pulley to discharge the paper and the friction star wheel is installed on the upper side, the power short means provided to one side of the pulley during the reverse rotation drive of the main stationary motor By the pulley is moved to the lower side is characterized in that the reverse rotational power of the feed roller is configured to block the transmission to the discharge roller.

The power shorting means of the pulley includes a lock spring which transmits power only when the pulley is rotated in reverse, a cam that is rotated by power by the lock spring, and a stopper that enables the pulley to move downward by being caught by the cam. It was made.

1 is a cross-sectional side view of an inkjet printer according to the prior art,

Figure 2 is a partially separated perspective view of the prior art Figure 2,

Figure 3 is a schematic configuration diagram of one side showing a paper transfer process according to the prior art,

4 is a cross-sectional configuration of the main line AA ′ of FIG. 3,

Figure 5 is a schematic configuration diagram showing one side of the main portion showing the paper transfer process according to the present invention,

6 is an exploded perspective view of the main portion of the device of the present invention,

FIG. 7 is a cross-sectional view taken along line BB ′ of FIG. 6;

8A and 8B are perspective views showing the action of the lock spring according to the present invention,

Figure 9 is a side view showing a forward rotation drive and action in the present invention,

10 is a side view showing the reverse rotation drive and action in the present invention.

Explanation of symbols on the main parts of the drawings

10: cassette 11: feed roller

12: Feed Roller 13: Friction Roller

14: base frame 15: badge roller

16: main station motor 18: pulley

19: shaft boss 20: spring shaft

21: Cam 22: Lock Spring

23: stopper

The paper reverse feed prevention apparatus according to the present invention will be described in more detail based on the attached preferred embodiment as follows.

According to FIG. 5, the paper p of the cassette 10 is fed by the feeding roller 11 which is linked by the power of the main stationary motor 16. As shown in FIG. The power transmission structure is omitted here.

Therefore, when the leading end of the paper p fed as described above reaches the beginning of the feed roller 12 and the friction roller 13, the paper p is momentarily reversed by the main reverse motor 16. When the reverse rotation process is completed, the main reverse motor 16 receives the power by the gears 17, 17 ', and 17 while the reverse rotation process is completed. The feed roller 12 is rotated forward so that the paper p is conveyed.

The feed roller 12 repeats the forward and stop operations corresponding to one-row transfer according to a printing command so that the print roller 12 can be printed one by one on the paper, and the paper p completes the printing. If the rear end is completely out of the feed roller 12 is driven from this time to continue the constant speed rotation.

Therefore, the pulley 18 receiving surface rotation from the feed roller 12 and receiving the rotational force, and the discharge roller 15 receiving the power from the pulley 18 are continuously rotated, so that the friction star wheel 15 ' ), The printed paper p is completely discharged.

Therefore, the pulley 18 is to be installed by the elongated spring shaft 20 which is installed so that both ends of the shaft boss 19 is formed to protrude to the bottom portion of the base frame 14 as shown in FIG. The both ends of the spring shaft 20 is installed to be bent in the upper direction, so that the pulley 18 is configured to have an elastic action in the upper direction.

Therefore, the pulley 18 is configured to obtain a frictional force for power transmission while being in close contact with the feed roller 12 and the medium roller 15 by the elastic action of the spring shaft 20.

In addition, one side of the pulley 18 is provided with a cam 21 having a shaft portion 21a, one end of which is inserted into the pulley boss 18a. The shaft portion 21a is configured to be loosely inserted into the pulley boss 18a so that the power of the pulley 18 is not directly transmitted to the cam 21.

Therefore, the lock spring 22 is installed in the shaft portion 21a of the cam 21. The lock spring 22 is installed such that one end portion 22a of the lock spring 22 is fixed to the pulley boss 18a.

8A and 8B show the action of the lock spring 22. That is, since the lock spring 22 has one end 22a of the lock spring 22 fixed to the pulley boss 18a, when the pulley 18 rotates in reverse, the lock spring 22 has one end 22a as shown in FIG. 8A. ) Is rotated inward, so that the diameter d of the lock spring 22 gradually comes to a state where the cam 21 shaft portion 21a is gradually tightened.

Therefore, when the lock spring 22 is no longer able to tighten the cam 21 shaft portion 21a by the continuous reverse rotation of the pulley 18, the cam 21 rotates from this time. Referring to FIG. 10, the rotational direction of the cam 21 is counterclockwise, which is the reverse rotational direction of the pulley 18.

FIG. 8B shows the lock spring 22 in a state in which the pulley 18 is rotated forward. At this time, as its one end 22a is rotated outward, the diameter d 'of the lock spring 22 is gradually increased. ) Will become large. Therefore, eventually, the lock spring 22 and the shaft portion 21a of the cam 21 are spaced apart from each other so that the power is not transmitted to the cam 21 even if the lock spring 22 is rotated together with the pulley 18. It will not be delivered.

The stopper 23 which can stop the rotation of the cam 21 protrudes from the bottom of the base frame 14 at the upper side of the cam 21.

9 shows a state during the forward rotation of the printer. At this time, the pulley 18 receives power by the feed roller 12 that is powered from the main stationary motor 16 to perform the forward rotation operation in the clockwise direction. As a result, the discharge roller 15 rotates forward clockwise, thereby smoothly discharging the paper p.

In this forward rotation drive, the lock spring 22 does not transmit the turning power of the pulley 18 to the cam 21 as its diameter d opens as shown in FIG. 8B. Of course, some power is initially transmitted to the cam 21 shaft portion 21a at the beginning of the forward rotation, so that the cam 21 can be rotated, but since the cam 21 protrusion 21b is caught by the stopper 23, No more power transmission.

Therefore, in the forward rotational drive, the power of the feed roller 12 is smoothly transmitted to the discharge roller 15 by the pulley 18, thereby achieving a normal paper p discharging function.

Fig. 10 shows the state during reverse rotation driving of the printer. Since the reverse rotation drive in the printer has already been mentioned above, the description thereof will be omitted, and only the information related to the present invention will be described.

That is, when the main reverse motor 16 reversely drives to align the leading edge of the paper according to the feeding of the next sheet, the pulley 18 reverses the rotation of the feed roller 12.

Accordingly, the reverse rotation of the pulley 18 causes the lock spring 22 to be reduced in diameter d, as shown in FIG. 8A, to compress and rotate the cam 21 shaft portion 21a.

Accordingly, the cam 21 is rotated in the clockwise direction so that the wheel portion 21b thereof is caught by the stopper 23 but nevertheless the cam 21 continuously tries to rotate.

However, since the stopper 23 is fixed, it is not pushed, and the cam 21 is eventually pushed out by the rotational force of the cam 21, so that the pulley 18 itself installed in the spring shaft 20 is slightly It is pushed to the right and downwards.

Therefore, the pulley 18 is in a state in which it is spaced apart from the discharge roller 15 so that the pulley 18 does not receive power from the pulley 18.

That is, the output roller 15 is not rotated due to the separation action of the pulley 18 during the reverse rotation driving of the printer, so when there is an obstacle in front of paper discharge or when the next sheet of paper is fed by a low discharge pressure Even if it is not discharged even when the rotation operation occurs, the discharge roller 15 is stopped without being rotated backwards, so that the sheet which is not discharged is not transferred back into the printer.

Next, when the printer is driven forward again, the spring shaft 20 is always raised to the original position by the spring force that pushes the pulley 18 upwards, and then returns to the original position. Contact with the feed roller 12 and the discharge roller 15 is in a state of transmitting power.

According to the above description, since the present invention automatically cuts off power transmission from the pulley at the time of reverse rotation of the printer, the output roller is stopped so that the printed paper is not transferred back. There is an effect that can be completely prevented from generating paper jam.

Therefore, it is a useful design that provides the effect of increasing product reliability and distributing high quality products.

Claims (3)

A feed roller receiving the power of the main stationary motor, a pulley contacting the feed roller to transmit power to the discharge roller, a spring shaft for applying tension to the pulley upward, and a pulley to supply power to the feed roller. In having the discharge roller which receives the paper and receives the friction star wheel installed at the top, The paper station of the inkjet printer, characterized in that the pulley is moved to the lower side by the power short means provided to one side of the pulley when the reverse rotation drive of the main stationary motor is blocked from being transmitted to the discharge roller. Feed prevention device. The method of claim 1, The power shorting means of the pulley includes a lock spring which transmits power only when the pulley is rotated in reverse, a cam that is rotated by power by the lock spring, and a stopper that enables the pulley to move downward by being caught by the cam. Paper back feed prevention device of the ink-jet printer, characterized in that. The method of claim 2, One end of the lock spring is configured to be fixed to the pulley, the cam back of the ink jet printer, characterized in that the cam shaft portion is configured to be inserted into the diameter of the lock spring.