KR20000031153A - Clutch of printing device - Google Patents

Abstract

PURPOSE: A clutch of a printing device is provided to reduce the whole apparatus of an ink-jet printer by making the structure of paper supplier simple and to rapidly supply and transfer paper by using a single power source. CONSTITUTION: A clutch is composed of a gear clutch(246), a pickup shaft(241), a hub(254), a screw(258), a spring clutch(251), a ratchet(252) having one protrusion(253) on a circumference, a spring stopper(247) and a stopper(248). A hub protrusion(255) is placed under the stopper by lifting the stopper as the gear clutch is forward rotated and the ratchet and the hub are rotated. In here, when the hub is first rotated, the hub projection is rotated to lift the stopper so that the projection of the ratchet is prevented from sticking to the stopper by force.

Description

Clutch of printing device

The present invention relates to a printing device, and more particularly, to a power switching device of a clutch having a structure for double operation.

An inkjet printer is a device that prints the contents (data) on a monitor by printing an electric signal from a computer. The inkjet printer has a paper feeder unit 20 for supplying paper, a feeder unit 50 for feeding and feeding paper from the paper feeder unit 20, and a transporter unit 50 as shown in FIG. It includes a printing device unit 40 for printing on the paper conveyed by the) and the paper discharge device unit 60 for discharging the paper printed by the printing device unit 40 to the outside.

The paper feeder unit 20 includes a pickup roller 24 for supplying the paper 23 of the paper tray 21 to the feeder unit 50, and the pickup roller 24 for picking up the paper 23. It comprises a paper stacking plate 22 to provide a frictional force so that it can be, and a spring 25 to provide a predetermined pressure to the paper stacking plate 22. The rotational force of the line feed motor 30 is transmitted to the idle gears 26, 27, 28, and 29 to drive the pickup roller 24. The paper 23 picked up by the pickup roller 24 is drawn between the friction roller 51 of the feeder unit 50 and the feed roller 52 through the feed path, and is conveyed to the printing apparatus unit 40. After the printing process is completed, the paper passes through the base frame 61 and is discharged to the outside of the printing device by the star wheel 62 and the discharge roller 63 of the paper discharge device unit 60.

When the paper feeder unit 20 drives the motor 30 in the forward direction, the pin gear 26 connected to the motor shaft is driven, and the plurality of idle gears 27, 28, 29 engaged with the pin gear 26 are driven. The driving force transmitted through) is transmitted to the pickup roller 24 to transfer the uppermost sheet 23 to the printing apparatus unit 50 while the pickup roller 24 rotates once.

Then, when the motor 30 rotates backward, the feed roller 52 engaged with the pinch gear 27 is driven to transfer the paper 23 to the printing unit 40 to perform printing.

In order to perform various operations for sheet feeding and continuous paper movement during printing in an automatic sheet feeding type printer, an additional power source for changing the direction of power in support of one driving source (motor) is used or Sensors and the like for detecting the operation position are often mobilized.

It is the technical field of the present invention to seek a method for implementing these mechanical operations most concisely and inexpensively.

Since the paper is held close to the pickup shaft by the feed spring even though the driving force of the pick-up roller is intermittent, the above-mentioned resistance force is applied when the paper leaves the pickup shaft by applying a resistance force to the main feed part by the load of the rotating friction part. Removal at one time affects high-quality print line feed behavior, resulting in uneven prints.

In other words, after feeding, the paper and the pick-up shaft continue to contact each other and rotate, thereby causing load variation. In order to operate the paper feeder with a single power source and to separate the paper and the pick-up shaft after feeding, the pick-up roller (pick-up shaft) has to be rotated only once, and is a semi-circular structure, so it is a sensor for detecting the rotational position. The external power shall be used for the operation of the clutch to switch the power after feeding.

Among the methods using external power, the method of moving the carriage motor for the reciprocating motion of the ink head to a specific position and operating the clutch to release the paper after supplying it again can not avoid the feeding operation delay and structural complexity. There is a problem.

In other words, the paper feeder unit 20 as described above uses a large number of idle gears 27 to 29 from the pinch gear 26, and thus has a large number of parts and is complex to assemble. As it requires a sensor 36 for checking the potential value after the rotation, the operation circuit is complicated.

Therefore, the present invention is to solve the above-mentioned problems, to simplify the configuration of the paper feed device so that the entire apparatus of the inkjet printer is reduced, it is possible to quickly perform the paper feeding operation and transfer operation using a single power source There is an object of the present invention.

The present invention for achieving this purpose is provided with a gear clutch that rotates in conjunction with the pickup shaft receives power from the line feed motor, a spring stopper mounted in the concave groove formed in the extension shaft of the gear clutch, and has a protrusion on the circumference A ratchet, a spring clutch which is installed to surround the extension shaft of the gear clutch and is inserted into the ratchet, and transmits power when rotated in the wound direction, and springs are unfolded to block power transmission when driving in the opposite direction, and the ratchet The hub coupled to one side of the pickup shaft passed through has a protrusion on the rotating surface, and is in close contact with or separated from the protrusion of the ratchet according to the operation of the spring stopper, and by the protrusion of the hub during the momentary reverse rotation operation of the pickup shaft. And a stopper for releasing the stopping function.

In addition, another feature of the present invention is to perform a quick feeding operation by operating the clutch without further mobilizing the power source.

1 is a schematic diagram schematically showing a configuration of an inkjet printer;

2 is an exploded perspective view showing the configuration of a clutch device according to the present invention;

FIG. 3 is a cross-sectional view of a portion of the component of FIG. 2 assembled; FIG.

4 is a side view showing a state in which the gear clutch rotates so that the protrusion of the ratchet is in close contact with the stopper, and the hub protrusion is not in contact with the stopper;

5 is a side view showing a state in which the stopper is lifted while the clutch of FIG. 4 is rotated in reverse;

6 is a side view showing a state where the protrusions of the hub protrusion and the ratchet are positioned below the stopper;

Figure 7 is a side view showing a state that the protrusion and the hub protrusion of the ratchet passed through the stopper.

* Description of symbols on the main parts of the drawings *

24; Pickup roller 241; Pickup shaft

241a; Guide 242; Sidewall

243; Hole 244; Pinhole

245; Support holes 246; Gear clutch

246a; Concave groove 247; Spring stopper

248; Stopper 249; Support

250; Stopper pin 251; Sprinkler clutch

252; Ratchet 253; Protrusion

254; Hub 255; Hub protrusion

256; Guide groove 257; Fastening groove

258; screw

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings. Exemplary drawings FIGS. 2 to 3 illustrate disassembled and assembled various components of the paper feeding unit according to the present invention.

The gear clutch 246 connected to the idle gear from the line feed motor 30 is rotatably inserted into the pickup shaft 241. The hub 254 is firmly assembled to one side of the pickup shaft 241 by the screw 258. One end of the sprinkler 251 is fitted into the fastening groove 257 of the hub 254, and is configured to surround the gear clutch 246 at the same time.

When the gear clutch 246 rotates in the wound direction, it is tightened and transmits power, and when the gear clutch 246 is driven in the opposite direction, the sprinkler clutch 251 is unfolded and turned away. One end 251a of the sprinkler 251 is inserted into the fastening groove 257 of the hub 254 so that there is no mutual movement, and the other end 251b of the ratchet 252 has one protrusion 253 on the circumference thereof. Inserted into the side groove 259 formed on the side to stop the ratchet 252, the transmission power is also cut off. That is, the spring clutch 251 has a function of transmitting power to the pickup shaft 241 or blocking it. The spring stopper 247 is inserted into the concave groove 246a of the gear clutch 246 for continuous frictional rotation, but can operate the stopper 248 with a certain amount of friction torque. The stopper 248 is installed on the side wall 242 to be in close contact with and detached from the protrusion 253 of the ratchet 252 to allow only one rotation of the pickup shaft 241, and each movement thereof is a spring stopper 247. Depends on

Guides 241a are formed at both ends of the circumferential surface of the pickup shaft 241 to fasten the gear clutch 246 and the ratchet 252 to the pickup shaft 241. It is inserted into the guide groove 256 formed on the inner circumferential surface of the hole of the hole 254, and is firmly fastened. After inserting the screw 258 through the hole penetrated in the center of the hub 254, it is locked to the hole of the end of the pickup shaft 241. Assemble

The spring stopper 247 is fastened to one outer circumferential surface of the gear clutch 246, and the spring clutch 251 and the ratchet 252 are assembled to the other outer circumferential surface of the gear clutch 246. Orienting and inclining toward the ratchet 252, one end of the spring clutch 251 is inserted into the ratchet 252 and fastened, the other end is fixed to the fastening groove 257 formed in the hub 254. When the ratchet 252 is rotated in the unwinding direction of the spring clutch 251, the ratchet 252 is restored to its original state by the elastic force of the spring.

In addition, a pinhole 244 is formed at an adjacent portion of the pickup shaft 241 fastened to the side wall 242 of the paper storage box, and a stopper pin 250 is inserted therein, and is separated from the pinhole 244 to support holes 245. ) Is formed and the stopper 248 is assembled to the side wall 242 via the support piece 249 integrally formed. The stopper 248 is fastened to the stopper pin 250, and the stopper 248 moves through the stopper pin 250 in the assembled state via the support piece 249. When the gear engaged with the gear clutch 246 rotates, the pickup shaft 241 rotates once in the direction of the arrow, and the protrusion 253 of the ratchet 252 is in close contact with the stopper 248 and then rotates.

In addition, the spring clutch 251 inserted and wound on a portion of the gear clutch 246 rotates the ratchet 252 having the opposite side inserted in the unfolding rotation direction instead of the original tightening (close contact) direction, and the ratchet ( The protrusion 253 of the 252 pushes the portion in contact with the stopper 248 with the spring clutch 251 elastically. At this time, the amount of forced rotation (the reverse direction of the power transmission) to expand the spring clutch 251, and pushes the stopper 248 with the unfolded elasticity.

4 illustrates that the gear clutch 246 rotates forward in the direction of the arrow, and the ratchet 252 also rotates by the spring stopper 247 so that the protrusion 253 is engaged with the stopper 248 to be in close contact. The hub protrusion 255 is positioned behind the protrusion 253 and spaced apart from the stopper 248 at an acute angle. The stopper 248 is in close contact with the protrusion 253 of the ratchet 252, indicating that the rotation of the pickup shaft is momentarily delayed.

FIG. 5 illustrates a state in which the sprinkler clutch 251, which is frictionally inserted into the gear clutch 246, lifts the stopper 248 when the motor 30 rotates in a reverse direction according to a print signal of the inkjet printer. At this time, the stopper 248 and the protrusion 253 of the ratchet 252 is formed to be inclined by a predetermined amount (about 3 °), but the spring clutch 251 is rotated while being reversed by rubbing, so that it retracts smoothly.

The stopper 248 is lifted up, but the ratchet 252 is only retracted only a minute distance and remains in place. When the gear clutch 246 rotates in the direction of the arrow, the stopper 248 rotates clockwise while one end of the spring stopper 247 pushes the catch 248a formed on the stopper 247.

In addition, the gear clutch 246 instantaneously reverses, and accordingly, the ratchet and the hub rotate reversely, and the stopper 248 stops the spring stopper 247 fastened to the gear clutch 246 while the reverse stopper 248 rotates. Push the locking hole 248a of the clockwise movement, and at this time, the angle between the projection 253 and the hub projection 255 of the ratchet is reversed while maintaining the same.

6 again shows an operation when the motor 30 starts forward rotation. The gear clutch 246 starts to rotate with one end of the sprinkler 251 connected to the hub 254 while tightening the sprinkler 251, and the other end of the sprocket 251 of the ratchet 252 is inserted. The protrusion 253 also passes below the lifted stopper 248. The pickup shaft will rotate once. While the spring stopper 247 pushes the stopper 248a of the stopper 248 down, the stopper 248 descends to contact the outer circumferential surface of the ratchet 252 but the protrusion 253 of the ratchet 252 is already rotated. Starting with the gear clutch 246, the spring clutch 251, the hub 254 and the pickup roller 24 is rotated in this order.

That is, the gear clutch 246 rotates forward, and the ratchet and the hub 254 also rotate so that the hub protrusion 255 lifts the stopper 248 and is located below the stopper 248. Here, when the pickup shaft 241 operates normally, the hub protrusion 255 stays behind the protrusion 253 of the ratchet 252 and does nothing, but when the hub 254 rotates first, the hub protrusion 255 rotates. It rotates to push up the stopper 248 to prevent the protrusion 253 of the ratchet 252 from being forcibly in close contact with the stopper 248.

7 shows a state in which the gear clutch 246 rotates forward by receiving the rotational force from the idle gears 260 and 261 by driving the motor 30 so that the ratchet and the hub pass through the stopper 248 and rotate once. will be.

As described above, the hub protrusion formed on the hub rotates to push up the stopper, thereby preventing the protrusion of the ratchet from being forcibly contacted by the stopper.

As described above, the present invention has an effect of achieving a quick feeding operation by operating without an additional power source for driving the gear clutch and the sprinkler clutch. In addition, the sensor for detecting the position of the pickup roller is not necessary.

Claims (3)

A gear clutch that receives power from the line feed motor and rotates in conjunction with the pickup shaft, A spring stopper mounted in a concave groove formed in the extension shaft of the gear clutch; A ratchet having protrusions on the circumference, A spring clutch which is installed to surround the extension shaft of the gear clutch and is inserted into the ratchet and transmits power when rotated in the wound direction, and springs are unfolded when driving in the opposite direction to block power transmission; A hub coupled to one side of the pickup shaft passing through the ratchet and having a hub protrusion on a rotating surface; The clutch of the printing device, characterized in that the stopper is in close contact with or separated from the projection of the ratchet according to the operation of the spring stopper, the stopper is released by the hub projection. The method of claim 1; One end of the sprinkler clutch is inserted into the coupling groove of the hub and the other end of the clutch of the printing device, characterized in that inserted into the side groove of the ratchet. The method of claim 1; The hub is a guide groove for fixing to the pickup shaft, A hub protrusion for pushing up the stopper by a rotation operation; Clutch of the printing device characterized in that it has a fastening groove for fixing one end of the sprinkler.