JPS58110285A - Printer - Google Patents

Abstract

PURPOSE:To lighten the weight of a printer, and to reduce its cost by driving the shift of a printing ribbon and the feeding of the printing ribbon by one motor in the printer such as a typewriter. CONSTITUTION:A pawl 13a integrally turned is mounted to a gear 13 decelerating the revolution of the ribbon-feed motor 14, the pawl 13a is fitted to a ribbon winding shaft 7c projected from a cassette 7, and torque is transmitted to the cassette 7 side by the revolution of the gear 13 and the ribbon 7a is fed. Convex sections 13b are formed where synchronizing with a ribbon-feed pitch in the upper surface of the gear 13, and a cassette shift lever 12 is moved upward centering around a shaft 11 every time the gear 13 is rotated and the convex sections 13 reach the position of the cassette shift lever 12. Accordingly, the nose 12a of the shift lever 12 pushes up the bottom of the cassette 7, and the ribbon 7a is shifted to the position of printing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ribbon shift and ribbon feeding mechanism used in a printing device such as a typewriter.

In general, the print ribbon of a tygrapher shifts upward during printing, but at other times it has the function of descending so that the printed line is within the field of view of the typist. In order to perform such functions, a drive source for feeding the print ribbon and a drive source for shifting the print ribbon are required, but providing each separately would be extremely inconvenient as it would increase cost and weight. .

The present invention has been made in view of the above drawbacks, and an object of the present invention is to provide an inexpensive and lightweight printing device by driving printing ribbon shift and printing ribbon feeding with one motor.

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 shows the appearance of a typewriter equipped with a ribbon device according to an example of the present invention. By operating keys arranged on a keyboard 2 on the front of the main body case 1, printing is performed on printing paper (not shown) wound around a platen 6 via a hammer 4 mounted on a carriage 3 and a type wheel 5. . As shown in FIG. 2, the carriage 6 is mounted on a rail shaft 10 and can move left and right via a gIA movement mechanism (not shown). A hammer 4 is attached to the front part of the carriage 3 facing the platen 6, and a petal type type ring 5 having type letters arranged in the circumferential direction at its tip is rotatably attached to the front of the hammer 4. A printing cassette 7 is attached to the upper part of the carriage 3. ° Port 1 - Printing ribbon 7au stored in the printing cassette 7. A ribbon winding shaft 7C with a pawl 15a protruding from the cassette 7 shown in FIG. The feeding of the ribbon 7a is realized by transmitting the mating torque to the cassette side.

At the same time, a convex portion 13b is provided on the upper surface of the carrier 13 at a position synchronized with the ribbon feeding pitch, and each time the convex portion 13b comes to the position of the cassette silver 12 as the gear 16 rotates, the cassette shift lever 12 is moved upward about the shaft 11 as shown by the arrow in FIG. This movement causes the cassette shift lever tip 12a to move toward the cassette 7.
The printing ribbon 7a is moved to the printing point by pushing up the bottom of the printing ribbon 7a. The two-dot chain line in FIG. 4 shows the state during printing, and the solid line shows the state when not printing. This operation timing diagram is shown in the fifth diagram. Twice before and after printing, 1/
The motor is driven to feed the printing ribbon two pitches at a time. That is, the first pulse performs an upward shift, and the subsequent pulse performs a downward shift. As a result, the print ribbon is shifted only when printing, and is lowered the rest of the time. Also, during the upward shift of the ribbon, the motor is stopped, so ribbon feeding is stopped.

As described above, according to the present invention, ribbon feeding and ribbon shifting are performed by driving one motor multiple times, so the weight of the carriage can be reduced and an inexpensive and lightweight printing device can be obtained. It is also clear that the ribbon for printing correction can be used for a variety of purposes.

[Brief explanation of the drawing]

FIG. 1 shows the external appearance of a typewriter incorporating a ribbon device according to an example of the present invention. +Congratulations, Figure 2 is a perspective view showing details of the ribbon device k on the carriage, Figure 3 is a diagram showing the ribbon feeding mechanism of the ribbon device, and Figure 4 is the cassette of the ribbon device. Diagram showing the shift mechanism,
FIG. 5 is a diagram showing the operation timing in detail. Here 7...Fist printing force set) 7c... Ribbon winding shaft 11-...Rotation shaft 12...Cassette shift lever 13...Gear 13 a11@ @11・Claw 13b-・■・Protrusion 14・・・・Ribbon feed motor Tamu Canon Co., Ltd.

Claims (2)

[Claims] (1) A printing device characterized in that a single motor on a carriage performs ribbon shifting and ribbon feeding. (2) The printing device according to claim (1), wherein the motor is driven multiple times.