JPS6392482A - Ink ribbon cassette - Google Patents

Abstract

PURPOSE:To enable high-speed printing without increasing a torque of a motor for oscillating a ribbon cassette, by providing a storing member so supported that it can be oscillated in a direction orthogonal to the feeding direction of an ink ribbon, and a gear member for transmitting the rotation of the motor for oscillating the storing member. CONSTITUTION:An ink ribbon cassette 11 is provided with a gear 11a integrally with a casing of the cassette 11. The casing is provided with bosses 11b at left and right parts, the bosses are fitted into grooves 12a provided in a carriage body, and the cassette is so fitted that it can be rotated with the bosses 11b as a center of rotation by cassette holders 14 rotatably fitted to the carriage body by springs 13. Therefore, there is no need for a cassette frame. In addition, at the time of moving a printing part of an ink ribbon to a predetermined position, it is sufficient for a pulse motor 5 to generate a torque necessary for accelerating or decelerating an inertial load of the cassette 11, so that a small inexpensive motor for oscillation may be used, the weight of the carriage is reduced, and 1 high-speed printing may be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ribbon cassette used in printers such as typewriters and electronic typewriters.

[Prior Art] Generally, in a printer that uses an ink ribbon, the marks and side portions of the ink ribbon, which are wide enough to print several rows of type, are placed in a standby position that allows the operator to see the printed characters. Therefore, a phone vibration mechanism has been considered to move the type to several predetermined positions on the front surface during printing.

An example of the configuration of a conventional ribbon vibration mechanism of this type is shown in FIG.

In FIG. 4, the ribbon cassette l stores an ink ribbon 1a having a width sufficient to print two stages of type, and is rotatably supported by a part of the carriage body 2 and mounted on the main cassette frame 3. The ribbon cassette 2 is attached by presser springs 3a and 3da.

The rotation of the pulse motor 5 is transmitted to the ribbon cassette 1 to the ribbon cassette frame 3 by an arc-shaped gear 4 centered on the rotation center 3C and a gear 5a of the pulse motor 5 meshing with the gear 4. Or sway. When printing is performed continuously, the ribbon cassette is swung so that the printed portion of the ink ribbon 1a is cyclically positioned in front of the type from the first stage to the second stage.

In such a conventional vibration mechanism, when high-speed printing is performed, the cassette frame 3 must be oscillated at high speed together with the ribbon cassette. However, since it is difficult to miniaturize conventional ribbon cassettes, the pulse motor 5 requires torque to accelerate and decelerate the inertial load, which is the combination of the inertial load of the ribbon cassette 1 and cassette frame 3, and the inertial load of the gear 4. The more torque that is required, the greater the required torque, and large pulse motors capable of generating high torque or expensive pulse motors with powerful magnets have been used. Therefore, conventional devices have had the problem that a large pulse motor is expensive and that the weight of the motor is heavy, which increases the weight of the carriage and requires a load to be applied to the motor for moving the carriage.

(Problem to be solved by the invention) Therefore, an object of the present invention is to
To provide a ribbon cassette that enables high-speed printing without increasing the evening torque.

[Means for solving problems]

In order to achieve such an object, the present invention provides an ink ribbon, a storage member that stores the ink ribbon and is held swingably in a direction substantially orthogonal to the running direction of the ink ribbon;
The present invention is characterized by comprising a gear member provided on the storage member so as to transmit the rotation of a motor that swings the storage member.

[For production]

The present invention eliminates the conventional phone frame and sets the gear for swinging the ink ribbon cassette to be integrated with or attached to the case of the ink ribbon cassette, thereby reducing the weight of the ribbon cassette mechanism.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of the main part configuration of a carriage using an ink ribbon cassette according to an embodiment of the present invention.

In FIG. 1, the ink ribbon cassette 11 has a gear I1g, which corresponds to the gear 4 in FIG. 4, integrally formed with the case of the ink ribbon cassette l].

Bosses Ilb are formed on the left and right sides of the case of the ink ribbon cassette 11, and the boss Ila fits into a groove 12a formed of a part of the carriage body. It is rotatably attached with Ilb as the center of rotation. 5 is a pulse motor, and 5a is a gear.

With this configuration, the present embodiment eliminates the need for the cassette frame in the conventional example, so the weight of the cassette mechanism is reduced, and when moving the printed part of the ink ribbon to a predetermined position, the pulse motor 5 moves the ink ribbon cassette 1.
It is sufficient to generate the torque required to accelerate or decelerate an inertial load of 1, so a small pulse motor that generates a small torque or an inexpensive pulse motor with a weak magnet can be used.

Furthermore, by downsizing the pulse motor, the weight of the carriage can be reduced by φY, and a low torque, small, and inexpensive motor can be used for the carriage movement motor. In addition, there is a cost advantage due to the elimination of the ribbon frame.

In addition, in order to move and stop the ribbon printing part to the front of the type with high precision, the ink ribbon cassette gear lla
Is it necessary to minimize the backlash of the gear 5a of the pulse motor?

λ To achieve this, as shown in FIG. 1 (8), when the case of the ink ribbon cassette and the gear 4a are integrally molded, a constricted shape 11b is created, and the springiness of the plastic etc. that makes the gear 5a is used. If the gear Ila is shifted so as to press against the gear 5a, the hacklash will be sufficiently reduced. Furthermore, if a chamfer as shown by the symbol jiTI l c is provided at the lower end of the gear lla, when a cassette is installed as shown in FIG. It can be easily mated to.

If the pushing force against the gear 5a is weak due to the spring nature of plastic, etc., as shown in FIG. It is possible to rotatably load the cartridge and abut against part 11g of the case to regulate its position when it is not attached to a cassette or carriage.

It is technically difficult to mold the gear integrally with the case with high precision, or this method and the gear part are separate parts.
It is easy to mold high-precision gears. However, since the gear part is a separate member and the springs are added, there is a drawback that the cost is high.

Therefore, as shown in Fig. 3, if a post is made in the case of the cassette 1, and if the gear part is composed of the gear 21, the mounting plate 23, and the spring 22, then when the ribbon of the ink ribbon cassette is finished, , the gear section can be removed and the gear section attached to a new cassette.The gear section can be reused, is inexpensive, and is easy to handle, even an ordinary operator can do the work. Also, if the gear was integrated with the case, it would be bulky and expensive to transport, but with this method, the replacement ribbon cassette does not have the gear attached, so it is not bulky.

〔Effect of the invention〕

As described above, according to the present invention, the ribbon cassette has a gear for swinging the ribbon cassette attached to the ribbon cassette case, thereby eliminating the ribbon cassette frame and reducing the inertial load during swing. Therefore, a small and inexpensive swinging motor can be used, the weight of the carriage is also reduced, and the motor for moving the carriage can also be made inexpensive, resulting in significant cost benefits.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the main part configuration in the embodiment of the present invention, Fig. 2 is an explanatory diagram showing an example of the shape of the gear part in the embodiment of the invention, and Fig. 3 is the main part in the second embodiment of the invention. A perspective view showing an example of the structure. FIG. 4 is a perspective view showing the structure of the main parts of a conventional ink ribbon cassette and carriage. 5... Pulse motor, 11... Ink ribbon cassette, 11a... Gear, 12... Carriage tenon 1 13... Spring, 14... Cassette holder.

Claims (1)

[Scope of Claims] 1) An ink ribbon, a storage member that stores the ink ribbon and is held swingably in a direction substantially orthogonal to the running direction of the ink ribbon, and a motor that swings the storage member. An ink ribbon cassette comprising: a gear member provided on the storage member to transmit rotation. 2) In the ink ribbon cassette according to claim 1, a second gear member is attached to the motor, the second gear member is meshed with the gear member provided on the storage member, and the second gear member is meshed with the gear member provided on the storage member. An ink ribbon cassette, characterized in that the gear member provided in the ink ribbon cassette is pressed by the second gear member. 3) In the ink ribbon cassette according to claim 1 or 2, the gear member connected to the storage member has an arc shape, and a notch is provided on the gear side of the distal end opposite to the storage member. An ink ribbon cassette characterized by being provided with. 4) The ink ribbon cassette according to any one of claims 1 to 3, wherein the gear member is integrated with the storage member. 5) The ink ribbon cassette according to any one of claims 1 to 3, wherein the gear member is detachably attached to the storage member.