JPS60259477A - Automatic retraction mechanism for printing head - Google Patents

Abstract

PURPOSE:To simply attach a printing paper to a printer by a method in which a carriage is moved in a rocking manner around a fixed shaft by the eccentric rotation of a rotary shaft in such a way as to enable the separating distance between a printing head, a platen, and a printing paper to be properly adjusted. CONSTITUTION:A shaft stopper 10 is fixed through an eccentric bush 9 of the same eccentricity as an eccentric bush 5 in the same direction to one end of a rotary shaft 3. Both the eccentric bushes 5 and 9 do the same action, and the rotation of a drive motor 7 is positioned even on a shaft stopper 10. When a printing paper 15 is set, the stopper 10 is turned toward the direction of retracting a printing head 13 from the platen 14 by the drive motor 7 and comes into contact with a stopper brakcet 11 for stoppage. Since the interval between the tip of the head 13 and the platen 14 is sufficiently increased in this case, the setting of printing paper 15 can be very simply made.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an automatic print head retraction mechanism.

[Prior art and its problems]

Conventionally, when loading printing paper onto the platen, the print head
It is located at a distance from the platen approximately equal to the thickness of the printing paper, and may come into contact with the print head when loading the printing paper, making it difficult to load the printing paper or even causing a problem with the print head. There was a drawback that there was.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks by retracting the print head from the platen when the print paper is attached to the platen, and adjusting the spacing to match the thickness of the print paper after the print paper is attached. The purpose is to provide an automatic evacuation mechanism for

[Structure of the invention]

To achieve this, the configuration of the present invention includes a fixed shaft, a rotating shaft arranged parallel to the fixed shaft and rotated eccentrically about a predetermined axis parallel to the fixed shaft, and a drive for driving the rotating shaft. means, a carriage having one end movably fitted to the fixed shaft and a modified cross-sectional hole at the other end fitted to the rotating shaft, and a print head fixed to the carriage, the printing head being fixed to the carriage; The carriage is configured to swing around the fixed shaft due to the eccentric rotation of the printer, thereby variably adjusting the distance between the print head, the platen, and the printing paper.

[Embodiments of the invention]

Next, one embodiment will be explained with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of a print head retraction mechanism according to the present invention, and FIGS. 2 and 3 are a perspective view and a side view of the main parts of the mechanism, respectively.

In FIG. 1, 14 is a platen, and 15 is a printing paper placed on the platen 14.

2 is a fixed shaft, and 3 is a rotating shaft that is arranged parallel to the fixed shaft 2 and rotates eccentrically around the central axis (parallel to the fixed shaft 2) of the eccentric shaft 5.9, which will be described later at both ends. It is.

Reference numeral 1 denotes a carriage, one end of which is movably fitted to a fixed shaft 2, and a long hole 1a serving as a hole of irregular cross section at the other end is fitted to a rotating shaft 3. A gear 6 is fixed to one end of the rotating shaft 3 via an eccentric bush 5. A sling clutch 8 (having a gear on the outer periphery) fixed to the drive shaft of the drive motor 7 is engaged with the gear 6 to transmit the rotation of the drive motor 7 to the rotating shaft 3. The carriage 1 is swung by the rotation of the rotary shaft 30, so that the print head 13 fixed to the carriage 1 moves away from or approaches the platen L4. A shaft stopper 10 is fixed to the other end of the rotating shaft 3 via an eccentric bushing 9 eccentrically arranged in the same direction and by the same dimensions as the eccentric bushing 5. The eccentric bushing 5 and the eccentric bushing 9 move in the same manner, and the rotation of the drive motor 7 is also positioned at the shaft stopper IO. Accordingly, the shaft stopper 10 is also rotated to selectively come into contact with the stopper bracket 11 and the detent lever 12 (each fixed to a frame, not shown). That is, when the shaft stopper 10 is attached with the printing paper 15,
The drive motor 7 moves the υ print head 13 to the platen [4].
It rotates in a direction to be retracted from the position, and comes into contact with the stopper bracket 11, as shown by the solid line in FIG. 3, and is stopped. At this time, the distance between the tip of the print head 13 and the platen L4 is sufficiently V.
After opening, you can easily insert the printing paper 15.
can be attached. Further, upon receiving a printing command from the outside after mounting the printing paper 15, the drive motor 7U transmits the rotation opposite to that when the printing paper 15 is mounted to the rotating shaft 3, and the print head 13 approaches the printing paper 15. , it comes into contact with a detent lever 12 fixed at a predetermined position, as shown by the dashed line in FIG. 3, and is stopped. At this time, the distance between the tip of the print head 13 and the printing surface of the print paper 15 is a predetermined distance suitable for printing operation. Incidentally, by adjusting the position of the detent lever 12, the above-mentioned spacing can be adjusted as appropriate.

FIG. 2 shows a transmission system for a 70-rotation drive motor. In the figure, the rotation of the drive motor 7 is controlled by the slip clutch 8.
, the gear 6 and the eccentric bushing 5 to the rotating shaft 3, and from the rotating shaft 3 to the eccentric bushing 29 and the shaft stopper 10 in FIG. However, 7 Yaftostonba L
Since the position of O is not known before the printing paper 15 is installed, the drive motor 7 always rotates with a sufficient constant sound using the slip clutch 8 fixed to the drive shaft of the drive motor 7.
to communicate. The slip clutch 8 consists of a bush 8a that is directly fixed to the drive shaft of the drive motor 7, a spring (not shown) that is fixed to the bush 8a, and a gear 8b that is sandwiched between the bush 8a and the spring. Since the spring presses the plane of the gear 8b with a certain tension, the spring and the gear 8b rotate at the same rate within a certain tension. However, the shaft stopper 10 is not connected to the stopper bracket 11 or the detent lever 1.
2, rotation stops and gear 8b of slip clutch 8
When the spring is fixed, the spring slides on the plane of the gear 8b, and the rotation of the drive motor 7 is transmitted to the spring of the slip clutch 8, causing a slip to release the rotational force of the drive motor 7. I have to.

〔Effect of the invention〕

As explained above, according to the print head evacuation mechanism according to the present invention, the print head is retracted from the platen by swinging the carriage having the print head as necessary by the eccentrically rotating rotating shaft. , 1o Yoka 3.6 Yoo, □Ahe1
10. Ka, eh, no.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the print head retraction mechanism according to the present invention, and FIGS. 2 and 3 are perspective views of the main parts of the above mechanism, respectively. It is a front view. ■... Carriage 1a... Long hole 2... Fixed shaft 3... Rotating shaft 5.9... Eccentric bushing 6... Gear 7... Drive motor 8-mounted Srinopukunsochi River... Shaft Stopper 11... Stopper Graquent L2... Detent lever 13... Print head [4.
...Platen 15-...Printing paper Applicant Nippon "Kameki Co., Ltd. Ohtori"

Claims (1)

[Claims] a fixed shaft; a rotating shaft arranged parallel to the fixed shaft and eccentrically rotated about a predetermined axis parallel to the fixed shaft;
a drive means for driving the rotating shaft; a carriage having one end movably fitted to the fixed shaft and a irregular cross-sectional hole at the other end fitted to the rotating shaft; and a print head fixed to the carriage. In particular, the carriage is configured to swing around the fixed shaft due to the eccentric rotation of the rotating shaft, thereby variably adjusting the distance between the print head, the platen, and the printing paper as appropriate. Automatic evacuation mechanism for the print head.