JPS59188484A - Printer - Google Patents

Abstract

PURPOSE:To reduce the overall width of a printer and contrive to reduce the size and weight of a carrier, by a method wherein one ribbon spool is provided on a carrier, while the other is provided on the outside of the carrier, and a rotational motion converted by the carrier is transmitted selectively to the ribbon spool on the carrier through a clutch. CONSTITUTION:When returning the carrier 11 in the direction of an arrow L after printing in one line is completed, a motor 14 is reversely rotated to feed the carrier 11 leftward. At this time, a solenoid 7 is energized to turn a carrier frame 6 and the carrier 11 counterclochwise with a carrier shaft 3 as a fulcrum. A locking lever 30 the rotating position of which is not changed is engaged to a hole 29 of a disk 28 to lock the rotational motions of a ratchet 25 and later parts, so that a ratchet 26 is retracted from the ratchet 25. Namely, when the carrier 11 is returned leftward, the ribbon spool 20 is stopped, while the ribbon spool 19 is rotated, and a fresh part of a ribbon 18 is drawn out from the spool 19 to the front side of a plate 2. Accordingly, both the spool 19 on the outside of the carrier 11 and the spool 20 in the carrier 11 are single, the carrier 11 can be reduced in size and weight.

Description

[Detailed description of the invention] Technical field of invention The present invention relates to a printer.

Technical Background of the Invention and Problems There are two types of printers in which a carrier is moved along a platen: one in which a pair of ribbon spools is arranged on both sides outside the carrier, and the other in which a pair of ribbon spools is mounted on the carrier. Exists. The former increases the width of the entire device;
The latter is disadvantageous for high-speed printing because the carrier becomes larger and heavier.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a printer in which the width of the entire device can be reduced and the carrier can be made smaller and lighter.

Summary of the Invention This invention reduces the width of the entire device by mounting one ribbon spool on a carrier and placing the other ribbon spool outside the carrier, making the carrier smaller and lighter, allowing high-speed printing, and improving the straight line of the carrier. The motion is converted into rotational motion and the rotational motion is selectively transmitted to the ribbon spool on the carrier through the clutch, thereby causing the ribbon pulled out to the front of the platen to be transferred to the ribbon spool on the carrier when the carrier moves. Unused ribbon can be pulled out from the ribbon spool outside the carrier to the front of the platen, and a one-way clutch is used as a clutch to lock the ribbon spool on the carrier when the carrier moves in one direction. By locking the ribbon spool on the carrier, the ribbon spool on the carrier can be automatically switched between a rotating state and a fixed state each time the operating direction of the carrier changes.

Examples of the invention An embodiment of this invention will be described based on the drawings.

The platen (2), the carrier shaft (3), and the two spring hooks are mounted on a shaft (41 (51)) on the opposite frame (1), and the carrier frame (6) rotates on the carrier shaft (3). The left front part of the carrier frame (6) is equipped with a solenoid (force plunger (8)).
), and a spring (9) is tensioned between both rear sides and the spring hook shaft (5).

Next, a carrier α1) on which a thermal head (10) serving as a print head is mounted is rotatably and slidably held on the carrier shaft (3). At the rear of this carrier (11), there is formed a bending piece 0 (part) that slidably fits into the guide part (121) formed at the rear edge of the carrier frame (6). 1) On the side is a pulley (151) directly connected to the motor Q41.
is provided, and the left frame (1) has a pulley (16).
are attached, and both ends of a wire (lη) wound around these pulleys α51 (16) are fixed to both sides of the carrier aυ.

Furthermore, the vicinity of the right frame (1) and the carrier (lυ
A pair of ribbon spools (18) are wound around the ribbon (18).
11 (20) are provided. One ribbon spool (00) rotates integrally with a rotating shaft (2υ) supported on the carrier circle, and a wire rod whose both ends are fixed to the frame (1) is wound around this rotating shaft (21). A pulley (c), which is a conversion part for converting linear motion of the carrier (11) into rotational motion, is fitted in a slidable and rotatable manner while being urged upward in the axial direction by a spring (c). In addition, a ratchet (25) fixed to this rotating shaft (2]) and a ratchet (26) fixed to the pulley 123 are attached.
), a one-way clutch 07) is formed. Further, a circular plate having a large number of holes arranged radially is fixedly fitted to the rotating shaft Q. The carrier shaft (3) has a lock lever (to) which is a locking part that engages with the hole (2) of the disc (28) and is biased upward by a spring Oυ and is rotatable. carrier a
υ and Tomo are held in a freely sliding manner. moreover,
The carrier αυ is provided with a ribbon guide roller CI.

In such a configuration, when the carrier (1) is located on the left side of the platen (2), the ribbon α barrel, which has been wound around the ribbon spool α, is pulled out along the platen (2). Printing is performed while the carrier αυ is moved in the direction of the arrow hole as shown in FIG. That is, the motor (14) is rotated clockwise to move the carrier α1)fc to the right by the wire aη, but at this time the wire (
The two-wound pulley (c) rotates counterclockwise. This rotation is transmitted to the rotating shaft (2υ), the disk I2 barrel, and the ribbon spool (2Q).The ribbon spool σ is pulled out to the front of the Q platen (2) by providing rotational resistance. The ribbon is wound onto the ribbon spool (A) on the carrier α gauze. - When the line printing is finished and the carrier aυ is returned in the direction of the arrow shown in Fig. 5, the motor I is reversed and the carrier aυ is moved to the left. At this time, the pulley (c) and ratchet 06) rotate, but the solenoid (7) is energized and the carrier frame (6) and carrier circle are connected to the carrier shaft 7) (3) as a fulcrum by the spring (9). While bending, rotate it counterclockwise as shown in Figure 3. The lock lever C30, which is biased by the spring 61) and whose rotational position does not change, engages with the hole in the disc (C) and locks the rotational movement after the ratchet (251). Company) resists the force of Spring and evacuates from C1!51. In other words, when carrier 0υ returns to the left, carrier α
The ribbon spool on the gauze (201 is a stopper, and the ribbon spool handle is given rotation resistance, but the tension of the Ribo 70 barrel is greater, so it rotates, and the unused glue bon 08) is attached to the ribbon spool (from 1→ It is pulled out to the front of the platen (2).

In this way, since there is only one ribbon spool α outside the carriers α and υ, the width of the entire device (the interval between frames (1)) can be completely reduced. Since there is only one ribbon spool (20) on the carrier αυ, the carrier Oυ can be downsized and quantized, thereby enabling high-speed printing.

The ribbon spool can also be driven using the movement of the carrier αυ, and its drive can be reliably switched between a one-way clutch (2η) and a lock lever.

Effects of the Invention Since the present invention is configured as described above, the movement of the carrier can be converted into a rotational movement and the ribbon spool on the carrier can be selectively rotated by the clutch, thereby allowing the ribbon spool to be pulled out to the front of the platen. Wrap the ribbon around the ribbon spool on the carrier, Bon spool, 27...One-way clutch By using this and locking the ribbon spool on the carrier to the locking part, the ribbon spool on the carrier can be automatically switched between the rotating state and the fixed state each time the direction of movement of the carrier changes. This has the effect of reducing the width of the carrier, making the carrier smaller @11, and enabling high-speed printing.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view, Fig. 2 is a vertical side view showing the ribbon spool on the carrier rotating, and Fig. 3 is the ribbon spool fixed on the carrier. FIG. 4 is a reduced plan view showing the direction of printing operation of the carrier, and FIG. 5 is a reduced plan view showing the direction of return operation of the carrier. 2.Platen, 10...-Thermal head (print head), 11.Carrier, 18...Ribbon, 19, 20
...Applicant Tokyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A carrier on which a print head is mounted is provided so as to be movable along a platen, and one of a pair of ribbon spools around which both ends of ribbon are wound is set at a fixed position near the end of the platen. The other is provided on the carrier, and the carrier is provided with a conversion section that converts linear motion of the carrier into rotational motion and a clutch that transmits the rotational motion of the conversion section to the ribbon spool on the carrier. printer. 2. A carrier on which a print head is mounted is provided so as to be movable along the platen, and one of a pair of ribbon spools around which both ends of ribbon are wound is set at a fixed position near the end of the platen, and the other is placed on the carrier. a converter for converting the linear motion of the carrier into a rotational motion; a one-way clutch for transmitting the rotational motion of the converter to the ribbon spool on the carrier; and a one-way clutch for transferring the ribbon spool when the carrier moves in one direction. A printer characterized in that the carrier is provided with a locking portion for locking.