JPH0728656U - Two-stage printing ribbon cassette - Google Patents

Abstract

(57) [Summary] [Structure] The ribbon cores 3a and 3b of the two-stage ink ribbons a and b are rotatably supported on the left and right common bobbin cores 2a and 2b, respectively, and between the bobbin cores 2a and 2b and the upper and lower ink ribbons. The torsion coil springs 11 and 12 are arranged so as to be in contact with each other inside and outside, and the winding direction of the torsion coil spring from the engaged one ends 111a and 12a is set to the inner torsion coil spring 11 on the ink ribbon winding side. The same as the direction of rotation of the bobbin core, and the outer torsion coil spring 12
Is opposite to the direction of rotation of the bobbin core, the inner side of the coiled coil spring 11 is opposite to the direction of rotation of the ribbon core, and the outer side torsion coil spring 12 is the same as the direction of rotation of the ribbon core on the winding side. [Effect] The ribbon cassette can be smoothly and reliably moved up and down in the printing apparatus, and the ink ribbon can be wound up without slack.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a two-stage type ink ribbon cassette for printing in which different ink ribbons are wound in two stages.

[0002]

[Prior art]

 A conventional ink ribbon cassette has an ink ribbon ribbon core rotatably supported by a bobbin adapter provided in a printing device such as a time recorder. There is known a two-stage type ink ribbon cassette in which two different levels of ink ribbons of different black are provided and two-color printing is performed by moving the ink ribbon cassette up and down. However, in the configuration in which the upper and lower ink ribbons are provided in two stages, the upper and lower ink ribbons are used differently, so that the diameters of the two ink ribbons are also different. Therefore, if the upper and lower ink ribbons rotate at the same amount, one of them will loosen. For this reason, this two-stage type ink ribbon cassette is provided with bobbin adapters in two upper and lower stages, and the ribbon cores of the ink ribbons of each color correspond to the bobbin adapters of each stage.

However, in such a configuration in which the bobbin adapter and the ribbon core are separately provided in the upper and lower sides, if the positions of the engaging protrusions of the upper and lower bobbin adapters and the engaging protrusions of the ribbon core are displaced in the rotational direction, the ink ribbon cassette is When the bobbin adapter is moved up and down, the engagement protrusion of the bobbin adapter hits the upper surface of the engagement protrusion of the ribbon core, so that the ribbon cassette cannot be moved up and down properly and two-color printing cannot be performed.

[0004]

[The purpose of the device]

 The present invention solves the above-mentioned drawbacks, and in particular, by integrally forming the bobbin core with the upper and lower ribbon cores, the ribbon cassette can be reliably moved up and down in the printing apparatus, and the ink ribbon can be wound without slack. It is an object of the present invention to provide a two-stage printing ribbon cassette that can be printed.

[0005]

[Means for achieving the purpose]

 In order to achieve the above object, the two-stage type ribbon ribbon for printing according to the present invention rotatably supports ribbon cores of different ink ribbons on upper and lower two stages of a pair of left and right common bobbin cores provided in the casing. , Two torsion coil springs are placed in contact with each other inside and outside between the outer peripheral surface of the bobbin core and the inner peripheral surface of the upper and lower ribbon cores facing each other on the left and right sides, respectively, and Each end of the torsion coil spring is engaged with the bobbin core and the ribbon core respectively, and the winding direction of the torsion coil spring from each of the above ends is set so that the inner torsion coil spring is aligned with the rotation direction of the bobbin core on the ink ribbon winding side. Make the same winding direction, and set the outer torsion coil spring in the winding direction opposite to the rotation direction of the bobbin core, and place it on the winding side. Is inside the torsion coil spring as the rotation direction opposite to the winding direction of the ribbon core, characterized in that the outer torsion coil spring and the same winding direction as the rotation of the ribbon core.

[0006]

[Function and effect of the device]

 According to the above configuration, when the ink ribbon cassette is mounted on the bobbin adapter of the printing apparatus, the bobbin adapter and the bobbin core of the ink ribbon cassette are formed integrally on the left and right sides in common with the ribbon cores of the upper and lower stages. Therefore, since the bobbin adapter and the bobbin core always rotate together, there is no deviation in the direction of rotation, so the ribbon cassette can always be moved smoothly up and down, and printing with the selected ink ribbon is ensured. Can be realized.

Further, printing is performed from one side on the left and right toward the other side, and the ink ribbon is wound around the bobbin core on the one side. In this case, the bobbin adapter on the winding side of the ink ribbon is driven to rotate. Rotate in the ribbon winding direction. At this time, since the inner torsion coil spring is also wound in the winding direction, the diameter of the inner torsion coil spring expands as the bobbin core rotates, and comes into pressure contact with the outer torsion coil spring. As a result, the frictional force between both torsion coil springs becomes large, and the ribbon core follows the rotation of the bobbin core and the ink ribbon is wound up.

At this time, the ribbon core also rotates in the same direction on the wound side of the ink ribbon. However, since the outer torsion coil spring is wound in the same direction as the rotation direction of the ribbon core, the diameter of the outer torsion coil spring expands as the ribbon core rotates and comes into pressure contact with the inner peripheral surface of the ribbon core. Therefore, the frictional force between the inner torsion coil spring and the inner torsion coil spring is reduced, and the ribbon core rotates while the outer torsion coil spring slides on the inner torsion coil spring. Therefore, since the appropriate back tension is applied to the ink ribbon, the ink ribbon does not loosen during winding.

When printing is performed from the other side of the left and right toward one side, the ink ribbon is wound in the same manner by the action of the torsion coil spring which is opposite to the above-described case.

Therefore, according to the present invention, the ribbon cassette can always be smoothly moved up and down, the printing with the selected ink ribbon can be surely realized, and the ink ribbon is loosened at the time of winding. There is no.

[0011]

【Example】

 1 and 2 are a plan view and a sectional view of a two-stage type ink ribbon cassette. The ink ribbon cassette is different in upper and lower two stages of a pair of left and right bobbin cores 2a and 2b provided in a casing 1. The color ink ribbons a and b have ribbon cores 3a, 3b, 4a, and 4b rotatably supported. The bobbin adapters 5a and 5b provided in a printing device such as a time recorder (not shown) are attached to the bobbin cores. The engaging projections 6 on the outer sides of the bobbin adapters 5a and 5b to engage with the engaging grooves 7 formed on the inner peripheral surfaces of the bobbin cores 2a and 2b, and are mounted on the printer. At this time, the print head 8 provided in the printing device is configured to be positioned in the recess 9 formed in the casing 1.

The printing device has a drive mechanism for moving the bobbin adapters 5a and 5b up and down so that the print head 8 can select the upper ink ribbon a or the lower ink ribbon b, and the printing material ( It is configured so that bidirectional printing from left to right and right to left can be performed on a time card or the like). The ink ribbons a and b are multi-time ribbons that can be used repeatedly.

Next, the bobbin cores 2a and 2b are integrally formed in common on each of the left and right sides, and the ribbon cores 3a, 3b, 4a and 4b are rotatably arranged on the outer side of the bobbin cores 2a and 2b in upper and lower two stages. An annular space S is formed between the outer peripheral surfaces 9 of the bobbin cores 2a and 2b facing each other and the inner peripheral surfaces 10 of the upper and lower ink ribbons a and b.

In each of the upper and lower annular spaces S, as shown in FIGS. 3 and 4, two torsion coil springs 11 and 12 are arranged so as to face each other inside and outside. The bobbin cores 2a, 2b and the ribbon cores 3a, 3b, 4a, 4b are provided with engagement holes 13, 14 for the inner and outer torsion coil bars 11, 12, respectively, and the bobbin cores 2a, 2b are provided with the engagement holes 13 for engagement. One end 11a of the inner torsion coil spring 11 is engaged with one end 12a of the outer torsion coil spring 12 in the engagement holes 12 of the ribbon cores 3a, 3b, 4a, 4b. The other end of each torsion coil spring 11, 12 is free. The torsion coil springs 11 and 12 are in contact with each other. In the drawings (in particular, FIGS. 3, 5, and 6), there is a space between the torsion coil springs 11 and 12, but this is for the sake of easy understanding of the structure, and in reality, they are not in contact with each other. , They are pushing each other a little.

By the way, in the above spring mounting structure, when the bobbin core or the ribbon core is rotated, a large rotational force acts on the one ends 11a and 12a of the torsion coil springs 11 and 12, but the rotation with respect to the other end. The power is small. Therefore, when the bobbin cores 2a, 2b or the ribbon cores 3a, 3b, 4a, 4b are rotated in the same direction as the winding direction from the one ends 11a, 12a of the torsion coil springs 11, 12 as a whole, the torsion coil springs 11, A force acts to rewind 12 and the spring diameter increases, and when rotating in the opposite direction, a force acts to further wind up the torsion coil springs 11 and 12, and the overall spring diameter decreases.

Therefore, as for the winding direction from the respective ends 11a and 12a of the respective torsion coil springs 11 and 12, the inner torsion coil spring 11 on the left side in FIG. 3 is counterclockwise, and the outer torsion coil spring 12 is It is wound clockwise. On the other hand, as shown in the drawing, the inner torsion coil spring 11 on the right side is wound in the clockwise direction, and the outer torsion coil spring 12 is wound in the counterclockwise direction. Specifically, since the bobbin cores 2a, 2b and the ribbon cores 3a, 3b, 4a, 4b are the winding side of the ink ribbons a, b, or the winding side, the respective one ends 11a, The winding direction of the torsion coil springs 11 and 12 from 12a is the same as the rotation direction of the bobbin cores 2a and 2b on the winding side of the ink ribbons a and b, and the winding direction of the outer torsion coil springs 12 is The inner torsion coil spring 11 has a winding direction opposite to that of the ribbon cores 3a, 3b, 4a and 4b so that the winding direction is opposite to the rotation direction of the bobbin cores 2a and 2b and on the wound side. The outer torsion coil spring 12 is set to have the same winding direction as the rotating direction of the ribbon cores 3a, 3b, 4a, 4b.

According to the above configuration, when the ink ribbon cassette is first attached to the bobbin adapters 5a and 5b of the printer, the bobbin adapters 5a and 5b and the bobbin cores 2a and 2b of the ink ribbon cassette are left and right as shown in FIG. On the side, it is formed integrally with the upper and lower ribbon cores. Therefore, since the bobbin adapters 5a and 5b and the bobbin cores 2a and 2b always rotate integrally, there is no deviation in the rotation direction. Therefore, even if the ink ribbon cassette is moved up and down, the bobbin adapters 5a and 5b are engaged. Since the abutment piece 6 does not hit the bobbin cores 2a, 2b, the ribbon cassette can always be smoothly moved up and down, and printing with the selected ink ribbon a or b can be reliably realized.

When printing from left to right when printing, the ink ribbons a and b wound around the right ribbon core 3a (4a) are wound around the left bobbin cores 2a and 2b rotating counterclockwise. Being rolled up. In this case, as shown in FIG. 5, the left bobbin adapter 5a is rotationally driven, and the left bobbin core 2a rotates counterclockwise (winding direction). At this time, since the inner torsion coil spring 11 is also wound in the counterclockwise direction, the diameter of the inner torsion coil spring 11 expands as the bobbin core 2a rotates, and comes into pressure contact with the outer torsion coil spring 12. For this reason, the frictional force between the inner and outer torsion coil springs 11 and 12 becomes large, so that the ribbon core 3a (4a) follows the rotation of the bobbin core 2a and rotates counterclockwise to wind the ink ribbons a and b. Be done.

At the same time, the ribbon core 3b (4b) on the right side (winding side) also rotates counterclockwise. However, since the outer torsion coil spring 12 is also wound in the counterclockwise direction, the diameter of the torsion coil spring 12 expands as the ribbon core 3b (4b) rotates in the counterclockwise direction, and the torsion coil spring 12 becomes the ribbon core 3b (4b). ), The inner peripheral surface 10 of FIG. For this reason, the frictional force with the inner torsion coil spring 11 becomes small, so that the ribbon coil 3b (4b) rotates while the outer torsion coil spring 12 slides on the inner torsion coil spring 11. Therefore, an appropriate back tension is applied to the ink ribbons a and b, so that the ink ribbon does not loosen during winding.

On the other hand, when printing is performed from right to left and the ink ribbon is wound around the bobbin core 2b on the right side, the torsion coil springs 11 and 12 on the inner and outer opposite sides act. That is, as shown in FIG. 6, the right bobbin core 2b rotates clockwise (winding direction) together with the right bobbin adapter 5b. As the bobbin core 2b rotates, the diameter of the inner torsion coil spring 11 which is wound in the clockwise direction expands, and the frictional force between the outer torsion coil springs 11 and 12 increases due to the pressure contact with the outer torsion coil spring 12, so that the bobbin core 2b The ribbon cores 3b (4b) follow the rotation of (1) and rotate clockwise, and the ink ribbons a and b are wound up.

At the same time, the left side (winding side) ribbon core 3a (4a) also rotates clockwise, but at this time, since the outer torsion coil spring 12 is wound clockwise, its diameter expands. The inner peripheral surface 10 of the ribbon core 3a (4a) comes into pressure contact. For this reason, the frictional force with the inner torsion coil spring 11 becomes small, and the ink ribbon rotates while the outer torsion coil spring 12 slides on the inner torsion coil spring 11. At this time, an appropriate back tension is applied to the ink ribbons a and b, so that the ink ribbon does not loosen during winding.

[Brief description of drawings]

FIG. 1 is a front view of the inside of a two-stage printing ink ribbon cassette according to the present invention.

FIG. 2 is a side view showing a cross section of a part of the inside of the ink ribbon cassette.

FIG. 3 is a plan view illustrating an arrangement state of a torsion coil spring between a bobbin core and a ribbon core.

FIG. 4 is a side cross-sectional view illustrating an arrangement state of a torsion coil spring between a bobbin core and a ribbon core.

FIG. 5 is an explanatory diagram that schematically shows a state in which the ink ribbon is wound around one side.

FIG. 6 is an explanatory view schematically showing a state of winding the ink ribbon on the opposite side.

[Explanation of symbols]

 a ink ribbon b ink ribbon 2a bobbin core 2b bobbin core 3a ribbon core 3b ribbon core 4a ribbon core 4b ribbon core 11 inner torsion coil spring 11a one end (inner torsion coil spring) 12 outer torsion coil spring 12a one end (outer torsion coil spring)

Claims (1)

[Scope of utility model registration request] 1. A pair of left and right common bobbin cores provided inside a casing rotatably support ribbon cores of different ink ribbons respectively, and the outer peripheral surface of the bobbin core and the upper and lower ribbon cores facing each other on each of the left and right sides. Two torsion coil springs are arranged in contact with each other in an inner and outer double manner between the inner circumferential surface and the inner peripheral surface, and one ends of the inner torsion coil spring and the outer torsion coil spring are engaged with the bobbin core and the ribbon core, respectively. On the winding side of the ink ribbon, the winding direction of the torsion coil spring from each end is the same as the rotation direction of the bobbin core, and the outside torsion coil spring is the winding direction opposite to the rotation direction of the bobbin core. On the winding side, the inner torsion coil spring is wound in the opposite direction to the ribbon core rotation direction. The two-stage ribbon ribbon for printing is characterized in that the twist coil spring on the outside is in the same winding direction as the rotation direction of the ribbon core.