KR100258324B1 - Slidable driving system for thermal transfer ribbon - Google Patents

Abstract

PURPOSE: A device for transmitting a friction power of a heat transcription ribbon of a facsimile is provided to transfer a thermal transcription ribbon with a fixed tension maintained. CONSTITUTION: A winding gear(10) is slidably mounted to a rotating shaft(27) for being geared a gear train moved by a driving motor. A friction surface(11) closely contacted to a fixing disk(20), and a moving disk(30) is formed at both side surfaces of the winding gear(10). The rotating shaft(27) is rotatably mounted to a penetration groove(57) of a frame(55). The fixing disk(20) integrally mounted to the rotating shaft(27) for being contacted at the inner surface of the winding gear(10). The moving disk(30) slidably mounted to the rotating shaft(27) for being contacted at the outer surface of the winding gear(10). A disk-typed push plate(37) is mounted at the outer end portion of the rotating shaft(27). A compression coil spring(35) is mounted between the push plate(37) and the moving disk(30). An intermediate gear(47) is mounted at the inner end portion of the rotating shaft(27) for being integrally rotated with the rotating shaft(27).

Description

Fax Thermal Transfer Ribbon Friction Power Train

The present invention relates to a frictional power transfer device of a thermal transfer ribbon used in a plain paper facsimile, and more particularly, a thermal transfer ribbon passing through a thermal print head (TPH) can be conveyed with a recording paper at a constant speed and tension. It relates to a friction power transmission device configured to be.

In general, a facsimile is a device that electrically transmits and receives text, pictures, and photographs on a paper, and includes a transmission unit including a CIS (Contact Image Sensor) that recognizes the contents of the document and a CIS roller that transfers the document to the CIS. It is divided into a receiving unit including a TPH (Thermal Print Head) for receiving the electrical signal received from the outside and printing it on the recording paper, and a platen roller for transporting the recording paper to the TPH.

On the other hand, such a facsimile is generally classified into a method of using a specially processed roll-type thermal recording paper and a method of printing data using a general paper and a thermal transfer ribbon.

As shown in FIG. 1, the plain paper used in this method is configured such that the plain paper contained in the paper feed cassette 86 passes through the TPH 85 by the transfer roller 81, the platen roller 83, and the like. At this time, the thermal transfer ribbon 75 is interposed between the TPH 85 and the general paper to be transferred with the paper to print the data on the recording paper.

To this end, gear trains interlocked with each other to be interlocked by the drive motor 80 are installed outside the frame, and TPH gears of the platen roller 83 shaft end and winding gears 70 of the shaft end are installed in the gear train. Is engaged to rotate at a constant rotation ratio.

In addition, the recording paper and the thermal transfer ribbon should be configured to pass between the platen roller 83 and the TPH 85 at the same speed, and if the thermal transfer ribbon 75 is transported slower than the recording paper, One thermal transfer ribbon 75 is stretched in front of the TPH 85 to prevent the transfer of the recording paper, to be wrinkled or folded, and the like.

Therefore, in order to solve this problem, the transfer speed of the thermal transfer ribbon 75 should always be slightly faster than the recording paper transfer speed so that the tension is generated in the thermal transfer ribbon 75. However, if the tension is too high, the thermal transfer ribbon 75 is broken, and in order to prevent this, if a certain amount of tension is generated in the thermal transfer ribbon 75, the power transmitted to the thermal transfer ribbon 75 is reduced. It must be configured to be delivered while sliding.

As a representative example of the conventional thermal transfer ribbon winding power transmission device, a power transmission device using the sprinkler shown in FIG. 2 will be described.

An idling roller 65 is provided on the same axis as the above-described winding gear 60. A spring clutch 63 is installed at the idling roller shaft end 66 and the shaft end 61 of the winding gear, and is driven by frictional force. It is configured to deliver. In addition, one surface of the idling roller 65 is coupled to the shaft 71 extending from the take-up roller 70 is configured to transmit power.

Therefore, when the drive motor rotates, the winding roller 70 is rotated by the frictional power transmission of the sprinkler 63, and the thermal transfer ribbon is wound around the winding roller 70 to be transferred.

However, in such a power transmission device, since the frictional contact force is generated from the point where the spring clutch 63 is tightened, such frictional contact force is not always kept constant, and therefore, the tension of the thermal transfer ribbon in which sliding occurs is not constant. There is a problem that it is difficult to maintain a proper tension in the thermal transfer ribbon because it is changed without.

Therefore, the main object of the present invention is to provide a power transmission device that can be transferred while maintaining the above-mentioned thermal transfer ribbon constant tension.

1 is a schematic cross-sectional view showing the main structure of the facsimile,

Figure 2 is a main portion coupling cross-sectional view showing a representative example of a conventional thermal transfer ribbon power transmission device,

3 is a perspective view of main parts of a thermal transfer ribbon friction power transmission device according to the present invention;

4 is a cross-sectional view of main parts of the thermal transfer ribbon friction power transmission device according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: winding gear 11: friction surface

20: fixed disk 21: friction felt

27 axis 30 floating disk

31: friction felt 35: spring

37: Push Plate 47: Middle Gear

55: inner frame 56: outer frame

57: through groove 60: winding gear

61: shaft end 63: spring clutch

65: idling roller 66: shaft end

70: winding roller 71: shaft

73: cartridge 75: thermal transfer ribbon

77: driven gear 80: drive motor

81: feed roller 83: platen roller

85: TPH 86: Paper Feed Cassette

A constitutional means for achieving the object of the present invention is a power transfer apparatus for winding a thermal transfer ribbon of a facsimile,

A rotating shaft rotatably installed on the main body frame;

A winding gear slidably coupled to the rotating shaft by engaging a gear train outside the frame so as to be interlocked by a driving motor;

A fixed disk positioned on an inner side of the winding gear and coupled to rotate integrally with the rotary shaft, the fixed disk attaching a frictional felt to a contact surface with the winding gear;

A floating disk positioned on an outer surface of the winding gear so as to be slidably coupled to the rotation shaft and attaching a frictional felt to a contact surface of the winding gear;

A push plate coupled to an outer end of the rotation shaft;

A compression spring installed between the floating disk and the push plate to closely contact the side of the winding gear with the floating disk;

An intermediate gear coupled to the inner end of the rotating shaft so as to rotate integrally with the shaft;

It characterized in that it comprises a driven gear which is integrally coupled to the shaft end of the winding roller of the thermal transfer ribbon to engage the intermediate gear.

According to the above configuration, when the drive motor rotates to rotate the take-up gear, the fixed disk and the floating disk, which are in close contact with each other by the tension of the spring, rotate by the frictional force, thereby rotating the rotary shaft integrally, and coupled to the rotary shaft. As the intermediate gear is rotated, the transfer gear is transferred by rotating the interlocking driven gear and the winding roller.

At this time, the frictional force of the disk is always maintained within a certain range because the friction area and the adhesion force is constant, and if the tension of the thermal transfer ribbon is greater than the frictional force of the disk, the disk slides on the wall of the winding gear to transfer power. do.

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

Figure 3 is a perspective view of the main portion of the thermal transfer ribbon friction power transmission device according to the present invention, reference numeral 10 is a take-up gear interlocked by a drive motor, 20 is in close contact with the take-up gear 10, the rotating shaft coupled while frictional rotation ( 27 is a fixed disk which rotates integrally, and 30 is a floating disk which closely holds the take-up gear 10 toward the fixed disk 20 by the elasticity of the spring 35. In addition, reference numeral 47 is an intermediate gear that is coupled to the end of the rotary shaft 27 and transmits power to the driven gear 77 coupled to the winding roller 70 shaft end.

The take-up gear 10 is installed to slide on the rotation shaft 27 so as to be engaged with the gear train interlocked by the drive motor. Both sides of the take-up gear 10 are fixed disks 20 and floating disks 30 to be described later. Friction surface 11 is formed in close contact with each other. At this time, the rotating shaft 27 is rotatably coupled to the through groove 57 of the one side frame (55).

The fixed disk 20 is integrally coupled with the rotary shaft 27 to be in contact with the inner surface of the winding gear 10, wherein the contact surface with the winding gear 10, such as wool or synthetic fibers having a large friction resistance Attached to the friction felt 21 is made to be configured to receive power smoothly.

The floating disk 30 is slidably coupled to the rotating shaft 27 to be in contact with the outer surface of the take-up gear 10. At this time, the contact surface with the take-up gear 10 also has a friction felt 31 having a large friction force. I attach it.

At this time, the disc-shaped push plate 37 is coupled to the outer end of the rotating shaft 27, the compression coil spring 35 is provided between the push plate 37 and the floating disk 30. The fluid disk 30, the winding gear 10, the fixed disk 20 serves to elastically close to each other.

The inner end of the rotary shaft 27 is provided with an intermediate gear 47 coupled to rotate integrally with the rotary shaft 27, the intermediate gear 47 is at the shaft end of the winding roller 70 of the thermal transfer ribbon Engages with the driven gear 77 integrally coupled to serve to transfer the rotational force of the rotary shaft to the take-up roller 70.

Referring to Figure 4 with respect to the operation example according to the present invention configured as described above are as follows.

First, when the driving motor rotates to drive the gear train, the TPH gear meshed with the gear train and the winding gear 10 rotate at the same time.

At this time, the outer side of the winding gear 10 is provided with a floating disk 30, the outer side of the floating disk 30 is the compression coil spring 35 and the push plate 37 is installed Thus, the above-mentioned moving disk 30, the take-up gear 10, the fixed disk 20 is configured to be in close contact with each other.

At this time, the floating disk 30 and the fixed disk 20 receives the rotational force of the winding gear 10 by the friction force of the friction felt 31, 21, wherein the fixed disk 20 is the rotating shaft Since the rotary shaft 27 rotates as described above, the intermediate gear 47 coupled to the inner end of the rotary shaft 27 is integrally rotated and then engaged with the intermediate gear 47. As the driven gear 77 of the thermal transfer ribbon rotates, the winding roller 70 is integrally rotated, and the thermal transfer ribbon is wound around the circumferential surface of the winding roller 70 to be transferred.

At this time, since the circumferential speed of the winding roller 70 is always designed to be a little faster than the feeding speed of the recording paper, tension is generated in the thermal transfer ribbon, and thus, the fixed disk 20 and the winding gear are described. (10) The rotational force is transmitted while a slip is generated between the walls, and the thermal transfer ribbon is transferred at the same speed as the recording paper with a constant tension.

In addition, at this time, the compression coil spring 35 is interposed between the floating disk 30 and the push plate 37 so that the floating disk 30, the winding gear 10, and the fixed disk 20 are always elastic at a constant pressure. It comes in close contact. In addition, a sliding film is attached to the wall of the fluid disk 30 and the push plate 37 which are in contact with the compression coil spring 35, and the spring 35 is slid to wind the fluid disk 30 as a sliding gear ( 10) It is configured to be in close contact with.

As can be seen above, the power transmission device according to the present invention is to transmit power by the friction force of the fixed disk 20 and the take-up gear 10, wherein the push plate 37 and the floating disk 30 Springs (35) installed between the elastically close the fluid disk 30, the winding gear 10, the fixed disk 20 at a constant pressure.

Therefore, in the above power transmission device, since the area of the friction surface and the pressing force acting on the friction surface are always kept constant, the thermal transfer ribbon is transferred by the constant frictional force, so that the thermal transfer ribbon has excessive tension, It is possible to transfer while maintaining a constant tension without a transfer failure occurs.

Claims (3)

In a power train for winding a thermal transfer ribbon of a facsimile, A rotating shaft 27 rotatably installed on the main body frame 55; A winding gear 10 engaged with the gear train on the outside of the frame 55 so as to be interlocked by a drive motor and slidably coupled to the rotation shaft 27; A fixed disk 20 positioned at an inner side of the winding gear 10 and coupled to rotate integrally with the rotation shaft 27; A floating disk 30 positioned on an outer surface of the winding gear 10 and slidably coupled to the rotation shaft 27; A push plate (37) coupled to an outer end of the rotation shaft (27); A spring (35) installed between the floating disk (30) and the push plate (37) to bring the floating disk (30) into close contact with the side of the take-up gear (10); An intermediate gear (47) coupled to the inner end of the rotating shaft (27) to rotate integrally with the rotating shaft (27); A facsimile thermal transfer ribbon friction power transfer device, characterized in that it comprises a driven gear (77) integrally coupled to the winding roller (70) shaft end of the thermal transfer ribbon to engage the intermediate gear (47). The method of claim 1, wherein the friction felt 21, 31 is attached to the contact surface of the winding gear 10 of the fixed disk 20 and the floating disk 30 to smoothly transfer the power of the winding gear (10). A facsimile thermal ribbon friction power transmission device, characterized in that configured to receive. 2. The thermal transfer ribbon friction power of the facsimile according to claim 1, wherein a sliding film capable of sliding can be attached to a wall of the floating disk 30 or the push plate 37 in contact with the spring 35. Delivery device.

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