KR20060025507A - A printing-ribbon operating apparatus for card-printer - Google Patents

Abstract

The present invention is to provide a printing ribbon drive device for a card printer, so that the power transmission is stable and accurate as well as the durability is improved while the appropriate slip phenomenon is generated so that the rotational speed of the take-up roll is kept constant,

Accordingly, the printing ribbon driving device of the card printer rotates the take-up roll 330 by the power transmitted from the driving motor 340 to move the print ribbon 320 wound on the supply roll side to the print head to perform the printing process. In the printing ribbon drive device to be wound on the take-up roll after the roll, the roll drive gear 350 and the gear drive is formed so as to be engaged with the roll drive gear is formed on one side end of the take-up roll, the driven protrusion formed on the outside A gear 360, a spring 370 inserted into the locking protrusion of the driven gear and having a protruding pin formed outward, a groove portion into which the spring is inserted, and a pin insertion hole into which the protruding pin is inserted are formed, and the driving motor An electric gear 380 meshed with a drive gear coupled to an axis of the is configured.

Description

Print Ribbon Drive of Card Printer {A PRINTING-RIBBON OPERATING APPARATUS FOR CARD-PRINTER}

1 and 2 is a view showing a printing ribbon drive device of a conventional card printer,

3 is an exploded perspective view showing a print ribbon driving apparatus of a card printer according to a preferred embodiment of the present invention;

4 is a schematic cross-sectional view showing a print ribbon driving apparatus of a card printer according to a preferred embodiment of the present invention;

5 is a perspective view illustrating a coupling state of a print ribbon driving device of a card printer according to an exemplary embodiment of the present invention.

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

310: case, 320: print ribbon,

330: winding roll, 340: driving motor,

342: drive gear, 350: roll drive gear,

360: driven gear, 370: spring,

380: Electric gear.

The present invention relates to a printing ribbon drive device for a card printer, and more particularly, a printing ribbon supply roll for enabling a printing process by a thermal transfer head in an apparatus for printing a pattern or a character on a card such as a card printer. And it relates to a printing ribbon drive device for a card printer to facilitate the process of unwinding and winding on the take-up roll.

In general, a card printer that prints characters or patterns on various types of cards is provided with a card supplied from a card feeder and moved, and the card is positioned on the thermal head and the print ribbon is placed on the printing surface of the card. The printing process by the thermal transfer head is performed.

In addition, the printing ribbon is moved by the printing ribbon driving device during the printing process of the card. Such a printing ribbon driving device includes a plurality of guide rollers having a printing ribbon wound on a supply roll mounted on the supply side case of the card. The printing ribbon used in the printing process is driven to be wound around the take-up roll mounted on the discharge side case of the card while being guided to the printing process so as to be carried out.

And the conventional print ribbon drive as described above, as shown in the Republic of Korea Utility Model Registration No. 20-0277605 (Registration Date: May 27, 2002) bar (refer to Fig. 1) belt driven by the lower DC motor drive As the take-up roll 212 is rotated by the connection to the 213, the ribbon 216 is moved from the supply roll 214 to be transferred along the guide roller 215 to perform a printing process.

That is, the conventional print ribbon drive device is provided between the motor pulley coupled to the shaft of the DC motor and the roll pulley coupled to the shaft of the winding roll side is a method for transmitting power from the DC motor to the take-up roll side. Because it is made by belt, it is impossible to transmit power accurately, and the adjustment of reduction ratio must be dependent on the size of the outer diameter of the pulley, which causes the device to be larger than necessary or causes problems in configuration. Especially, the printing ribbon is wound around the winding roll side. If the outer diameter becomes large, the length of the printing ribbon unrolled from the supply roll side becomes too long in one rotation of the take-up roll. To prevent this, when the tension applied to the printing ribbon becomes large, slippage occurs in the belt. Is generated and the rotational speed of the take-up roll must be lowered, but slip phenomenon is very difficult with the belt power transmission method. I had a problem in that the belt is damaged.

The print ribbon driving device as shown in FIG. 2 is applied and used to solve the problems occurring in the belt driving type printing ribbon driving device as shown in FIG. 1. 20) an electric gear 30 rotatably inserted on the roll shaft 12 protruding to the outside is constituted, and the first and second friction members 40 and 50 on the left and right sides of the electric gear 30 are generally; (Consisting of Felt) is coupled to the outer side of the roll shaft 12 in contact with the first and second friction members, the first fixing ring 60 is installed to be movable and the movement inside the roll shaft 12 While the second fixing ring 70 is impossible, the compression spring 80 is installed by the washer 82 on the roll shaft corresponding to the outside of the first fixing ring 60.

In addition, a driving gear 92 coupled to a shaft of the driving motor 90 installed on the case 10 is coupled to the electric gear 30 so that the rotational force generated from the driving motor 90 is used to drive the driving gear 92. It is transmitted to the electric gear 30 through which the roll shaft 12 is rotated accordingly to rotate the take-up roll 10 is to move the printing ribbon wound on the supply roll (not shown) side.

The rotation of the winding roll 10 as described above is the compression spring (80) by applying a compressive elastic force to the first fixing ring 60, the electric gear including a first and second friction member (40, 50) ( 30) is performed in close contact with the first and second fixing rings 60 and 70.

However, in the structure as shown in FIG. 2, the frictional force of the first and second friction members 40 and 50 is changed during long-term use so that power transmission is not smoothly performed or the accuracy of power transmission is lowered. There is a problem in that the poor print quality is deteriorated, and the first and second friction members are worn during use, which requires frequent troubleshooting or replacement.

The present invention is to solve the above problems, the object of the card printer to ensure that the power transmission is stable and accurate as well as to improve the durability while the appropriate slip phenomenon occurs so that the rotational speed of the take-up roll is kept constant It is to provide a printing ribbon drive device.

The printing ribbon drive device of the card printer for achieving the above object rotates the take-up roll by the power transmitted from the drive motor, moves the print ribbon wound on the supply roll side to the print head side, and then prints the roll on the take-up roll again. A printing ribbon driving device to be wound around, comprising: a roll driving gear configured at one end of the take-up roll; A driven gear having a gear portion formed therein to be engaged with the roll driving gear and a locking protrusion formed on the outside thereof; A spring inserted into the locking protrusion of the driven gear and having a protruding pin formed outwardly; The groove is inserted into the spring is formed, the pin insertion hole is formed is inserted into the protrusion pin is characterized in that the electric gear is configured to be engaged with the drive gear coupled to the shaft of the drive motor.

Preferably, the coil winding direction of the spring is to be wound in a direction in which the inner diameter is kept constant without contraction of the winding interval of the coil when the driven gear is rotated to perform the normal winding operation of the winding roll.

The roll drive gear is integrally formed on the take-up roll or detachably formed.

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

Figure 3 is an exploded perspective view showing a print ribbon driving device of a card printer according to a preferred embodiment of the present invention, Figure 4 is a schematic cross-sectional view showing a print ribbon driving device of a card printer according to a preferred embodiment of the present invention, Figure 5 Is a perspective view showing a coupling state of a print ribbon driving device of a card printer according to a preferred embodiment of the present invention.

As shown in FIGS. 3 and 4, the printing ribbon driving apparatus of the card printer according to the present invention is a printing process wound around the supply roll mounted on the supply side case 310 of the card is guided to a plurality of guide rollers while the printing process is performed. The printing ribbon 320 used in the printing process to be released and moved to be performed is installed on the case 310 and applied to the shaft to apply a driving force to the winding roll 330 mounted on the discharge side case of the card. A driving motor 340 coupled to the 342, a roll driving gear 350 configured at one end of the winding roll 330, and a gear part 362 to be engaged with the roll driving gear 350. And a driven gear 360 having a locking protrusion 364 on the outside, a spring 370 inserted into the locking protrusion 364 of the driven gear 360 and having a protruding pin 372 on the outside, and the spring ( A groove into which the engaging protrusion 364 of the driven gear 360 into which the 370 is inserted is inserted A pin insertion hole 384 is formed in which a 382 is formed and a protruding pin 372 is inserted, and an electric gear 380 engaged with the drive gear 342 coupled to the shaft of the drive motor 340 is included. do.

The coil winding direction of the spring 370 should be wound in a direction in which the winding interval of the coil is kept constant without contraction when the driven gear 360 is rotated so that the normal winding operation of the winding roll 330 is performed. That is, in the normal rotational direction of the driven gear 360, the wound coil is not contracted so that the inner diameter does not change and smooth rotation is possible. When the driven gear rotates in the reverse direction, the coil interval becomes narrow and the inner diameter of the coil is small. While the inner circumferential surface is in close contact with the engaging protrusion 364, it is impossible to rotate the driven gear. In the accompanying drawings, as shown in FIG. 3, the coil is wound in a clockwise direction on the protruding pin 372 side of the spring 370.

The mounting ring part 366 on which the spring 370 is seated protrudes on the locking protrusion 364 in contact with the gear part 362 of the driven gear 360, and the electric gear 380 side in the center of the driven gear 360. A hole communicating with a hole formed in the hole is drilled.

The roll driving gear 350 may be formed integrally on the take-up roll 330 or may be configured to be separable, that is, in consideration of assemblability according to the structure of the card printer.

The operation of the present invention configured as described above is as follows.

As shown in FIGS. 4 and 5, when the driving motor 340 is driven in response to a user's operation signal, the driving gear 342 is rotated, and the electric gear 380 engaged thereto rotates, and thus the spring 370. The driven gear 360 is rotated in conjunction with the elastic force of the.

Since the roll drive gear 350 meshed with the driven gear 360 rotates, the take-up roll 330 on which the roll drive gear 350 is formed is rotated, so that the printing ribbon is wound on the take-up roll. The printing ribbon wound on the feed roll side is guided to the guide roller to pass the print head side to perform the printing process.

Referring to the above process in more detail as shown in Figure 5, when the drive gear 342 of the drive motor 340 is rotated in the clockwise direction, the electric gear 380 is rotated counterclockwise and interlocked driven gear In addition, the roll driving gear 350 is rotated in the clockwise direction while being rotated counterclockwise to perform the action of the printing ribbon 320 being wound to the take-up roll 330, at which time the coil of the spring 370 is wound. 3, when the driven gear 360 is rotated counterclockwise as shown in FIG. 3, the winding interval of the coil is not contracted and is wound in a direction in which the inner diameter is kept constant. Due to the increased thickness of the printing ribbon 320 wound on the roll roll, the tension applied to the printing ribbon increases at a time when the moving distance of the printing ribbon is increased in one rotation due to the increased roll roll diameter. Load on When the driven gear 360 engaged therewith is a slip (sliding action) phenomenon, the rotational speed is lowered and the rotational speed of the take-up roll 330 is lowered, thereby keeping the moving speed of the print ribbon 320 constant. do.

In addition, the printing ribbon driving apparatus of the card printer according to the present invention is not limited to the above-mentioned, but can be variously modified and applied within the technical scope of the present invention.

According to the printing ribbon drive device of the card printer according to the present invention as described above, since the power is transmitted by the gear system, the power transmission is accurate, the adjustment of the reduction ratio, etc. can be simplified, and the apparatus can be simplified. Even if the outer diameter becomes large, it is possible to adjust the rotational speed of the take-up roll due to the sliding action of the spring, so that the feeding speed of the printing ribbon can be kept constant at all times, and there are no failure factors and no replacement parts are required. It is a very useful invention that reduces maintenance costs and improves durability.

Claims (3)

In the printing ribbon drive device for rotating the take-up roll by the power transmitted from the drive motor to move the printing ribbon wound on the supply roll side to the printer head side to be wound on the take-up roll after the printing process is performed, A roll drive gear configured at one end of the take-up roll; A driven gear having a gear portion formed therein to be engaged with the roll driving gear and a locking protrusion formed on the outside thereof; A spring inserted into the locking protrusion of the driven gear and having a protruding pin formed outwardly; The groove of which the spring is inserted is formed, the pin insertion hole is formed is inserted into the projecting pin is formed, the print ribbon drive device of the card printer, characterized in that the electric gear is configured to be engaged with the drive gear coupled to the shaft of the drive motor. The method of claim 1, The coil winding direction of the spring is the print ribbon drive of the card printer, characterized in that when the driven gear is rotated so that the normal winding operation of the winding roll is wound in the direction that the coiling interval of the coil is not contracted and the inner diameter is kept constant Device. The method of claim 1, And the roll drive gear is formed integrally on the take-up roll or is detachably configured.

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