JPH0630945B2 - Winding mechanism to prevent meandering of carbon ribbon - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a carbon ribbon such as a thermal transfer carbon ribbon wound in a roll shape and printed on a continuous body such as a tag or a label from the feeding side to the winding side. Absorbs the slack at the time of being rolled up,
The present invention relates to an improvement in a winding mechanism for preventing the ribbon from meandering.

[0002]

2. Description of the Related Art Conventionally, a brake device is provided on the payout side as a mechanism for absorbing the slack on the payout side of this type of carbon ribbon, but since the take-up side and the payout side are independent rotation systems, respectively. The ribbon is loosened due to the inertial action of the feeding roll on the feeding side against a very small stop due to the intermittent rotation of the stepping motor on the winding side, which is necessary for printing and for cutting the continuous tag.

Further, when the ribbon, the tag, or the label is damaged during printing on the tag, label, or the like which is transferred and printed on the carbon ribbon, the print head is released from the rotation or the platen is separated. When the ribbon, tag, or label is reset, the ribbon has been in contact with the print head for a long time and has run. Since a certain amount of brake cannot be obtained on the side and printing is performed while the ribbon is slack, the ribbon wobbles.

Incidentally, when the ribbon meanders, there is a defect that printing cannot be performed at the widthwise ends of the tag and the label continuum which are printed together with the ribbon.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned conventional points, the present invention takes an excessive feeding due to the inertial action of the feeding side of a carbon ribbon wound in a roll shape or a slack due to the attraction of the ribbon due to the static electricity of the print head On the payout side, the rotational driving force in the direction opposite to the payout direction, so-called,
Applying back tension to feed the ribbon excessively,
An object of the present invention is to provide a carbon ribbon meandering-prevention winding mechanism that absorbs slack and always adheres the ribbon with an appropriate tension to prevent the meandering of the ribbon from being wound properly, and also to perform proper printing. To do.

[0006]

SUMMARY OF THE INVENTION The present invention focuses on applying a belt made of a coil spring having self-elasticity to a feeding rotary member such as a feeding shaft or a feeding pulley on the feeding side, and a roll on the feeding side. When winding the thermal transfer carbon ribbon wound like a coil from the feeding side to the winding side, a part of a belt composed of a coil spring is wound around the outer peripheral portion of the feeding rotation member on the feeding side, and the feeding side When the thermal transfer carbon ribbon is unwound from the sheet, and when the unwinding rotating member is rotated, an urging force that urges the unwinding rotating member in a direction opposite to the unwinding direction is accumulated in the belt composed of the coil spring. It is a winding mechanism to prevent meandering of carbon ribbon.

The feeding rotary member may be a feeding pulley.

The feeding rotary member may be a feeding shaft.

[0009]

In the present invention, a part of the belt composed of the coil spring is wound around the outer peripheral portion of the feeding rotation member on the feeding side, and the thermal transfer carbon ribbon is fed from the feeding side and the feeding rotation member is rotated. At this time, an urging force for urging the feeding rotary member in a direction opposite to the feeding direction is accumulated in the coil spring due to a frictional force between the outer peripheral portion of the feeding rotary member and the belt formed of the coil spring due to the rotation. Therefore, due to the accumulated force of this coil spring accompanying the rotation of the feeding rotary member,
A constant resistance force can always be applied to the feeding rotation member, that is, the thermal transfer carbon ribbon, and it is possible to guarantee reliable and stable feeding movement of the thermal transfer carbon ribbon.

Since the belt composed of the coil spring can store an urging force in its length direction, and can store the urging force larger than that of a general rubber belt or the like, the belt of the feeding rotary member can be used. It is possible to efficiently generate a resistance force in the direction opposite to the feeding direction.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, for example, a rotary shaft 1 of a step motor M installed inside a thermal printer P adopting a thermal transfer system, and a winding side A of a carbon ribbon R (hereinafter referred to as "ribbon"). A belt 4 is attached to the shaft 2 so that the rotational force of the rotating shaft 1 is transmitted to the winding shaft 2 and the winding reel 3.

Between the take-up pulley 5 on the take-up side A and the take-up pulley 7 on the take-out side B, a coil spring belt having self-elasticity for imparting a rotation transmission force in a direction opposite to the take-out direction, so-called back tension. (That is, a belt made of a coil spring) 8 is suspended.

As shown in detail in FIG. 2, a feeding shaft 6 rotatably held by a mounting plate 9 is mounted on the feeding pulley 7.

More specifically, one of the feeding pulleys 7 is provided with a friction member 11 such as felt and a shaft support member 12, and the other is provided between a double nut 15 with a flange 16 and a washer 13. A brake device 17 is provided which interposes a spring 14 and urges the spring pressure toward the feeding pulley 7, the friction member 11, and the shaft support member 12.

A delivery reel 10 having a carbon ribbon R wound in a roll is fixed in front of the mounting plate 9 of the delivery shaft 6.

Returning to FIG. 1, the feeding reel 1 on the feeding side B
The carbon ribbon R set to 0 is intermittently rotated by the take-up shaft 2 on the take-up side A in the direction of solid arrow (a) via the guide rollers 18 and 19 and the guide roller 21 of the print head 20 and the take-up reel. 3 is wound with a stopper such as a grip interposed.

On the other hand, a coil spring belt 8 suspended from a take-up pulley 5 on the take-up side A and a take-up pulley 7 on the take-out side B is provided on the take-up reel 10 in a direction opposite to the take-out direction of the carbon ribbon R. This is a configuration in which back tension in the direction of a certain dotted arrow (b) is applied.

In the figure, reference numeral 22 is a sensor of the carbon ribbon R, T is, for example, a tag continuum, and this tag continuum T has the carbon ribbon R on its surface via a holding member 23 of an opening / closing system. In the superposed state, desired printing is performed by the print head 20 at the platen roller 24 portion, then guided by the pair of rollers 25 and 26, transferred to a cutting device (not shown), and cut to a prescribed size. , Which is stored.

As described above, this mechanism has a so-called back tension between the winding side A and the feeding side B of the carbon ribbon R, which is a rotational driving force on the feeding side B in a direction opposite to the ribbon feeding direction. Since the coil spring belt 8 having self-elasticity is suspended in order to impart the cross section, the cross section disclosed in the appropriate winding mechanism of the tape-like continuous body of the prior application of the present invention, Japanese Patent Laid-Open No. 60-157440. Excessive feeding of the carbon ribbon R due to inertial action of the feeding reel 10 on the feeding side B and electrostatic action due to contact traveling with the print head 20 due to the stored energy of the coil spring belt 8 itself, as compared with a rubber belt having a circular shape. Can be absorbed more reliably.

This absorption is a back tension acting on the payout side B of the carbon ribbon R in the direction opposite to the payout direction, that is, in the winding tightening direction wound in a roll shape, which is the coil spring belt 8 itself. It is compression energy.

Therefore, since the excess and slack of the carbon ribbon R is stretched back by the coil spring belt 8, the ribbon meandering can be prevented.

Further, the feeding side B is also provided with a brake device 17 which elastically biases at least two members having different friction coefficients, so that the carbon ribbon R is always in a tense state and stable transfer is achieved. It

In the above embodiment, the feeding pulley 7 is used as the feeding rotary member, but the feeding rotary member 6 may be used as the feeding shaft 6 if necessary.

[0025]

As described above, according to the present invention, when the carbon ribbon wound in a roll shape is wound from the feeding side to the winding side, a belt composed of a coil spring is hung on the feeding rotating member to form a carbon ribbon. Since the back tension can be applied to the feeding side by rotating the feeding rotating member accompanying ribbon feeding, slack wrinkles during intermittent traveling of ribbon running and stop processing are always eliminated to prevent meandering and to achieve proper winding. Is possible.

[0026]

[Brief description of drawings]

FIG. 1 is an overall schematic view of a meandering preventive winding mechanism for a carbon ribbon according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view of a feeding side B including a coil spring belt 8 suspended on a winding side A and a brake device 17 of the same.

[Explanation of symbols]

R Carbon ribbon T Tag continuum A Winding side B Feeding side 1 Rotating shaft 2 Winding shaft 3 Winding reel 4 Belt 5 Winding pulley 6 Feeding shaft 7 Feeding pulley 8 Coil spring belt (Belt consisting of coil spring) 9 Mounting Plate 10 Feeding reel 11 Friction member 12 Shaft support member 13 Washer 14 Spring 15 Double nut 16 Flange 17 Brake device 18 Guide roller 19 Guide roller 20 Print head 21 Guide roller 22 Sensor 23 Holding member 24 Platen roller 25 Roller 26 Roller

Claims (3)

[Claims] 1. When winding a thermal transfer carbon ribbon wound in a roll shape on the payout side from the payout side to the takeup side, a belt made of a coil spring is provided on an outer peripheral portion of the payout rotation member on the payout side. When the thermal transfer carbon ribbon is partially wound and the thermal transfer carbon ribbon is unwound from the unwinding side and the unwinding rotating member rotates, an urging force that urges the unwinding rotating member in a direction opposite to the unwinding direction is the coil spring. A winding mechanism for preventing meandering of a carbon ribbon, which is accumulated on a belt made of. 2. The carbon ribbon meandering-preventive winding mechanism according to claim 1, wherein the feeding rotary member is a feeding pulley. 3. The meandering preventing winding mechanism for a carbon ribbon according to claim 1, wherein the feeding rotating member is a feeding shaft.