JPH022610Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a locking device for supporting the attachment to the main body in a printer having a main body on which printing paper is arranged and an attachment on which a type holder is arranged, and in particular, the invention relates to an improvement thereof. Regarding.

Conventionally, in a line printer that prints by hitting a type holding body such as a type drum or a type belt with a hammer, as shown in FIG.
A main body 1 has an aperture 1a formed on the front surface through which the ribbon passes, and a type holder 2 and a hammer (not shown) are held, and the center is centered on an axis perpendicular to the main body 1, with the type holder 2 facing the aperture. The attachment is separated into an attachment 3 whose base end is rotatably supported, and the attachment is arranged so that the front of the opening 1a of the main body 1 is opened during work such as cleaning or replacing the type holder, hammer, ink ribbon, etc. 3 is rotated to the open state, and during printing operation, the attached body 3 is rotated to the closed state so that the opening portion 1a is covered and the type holder 2 faces the paper. As a locking means for locking the appendage 3 to the main body 1 in an openable and closable manner, a structure shown in FIGS. 2 and 3 is known. That is, 4 is a support plate fixed to the end face of the appendage 3 on the distal end side, and has a slot 5 opening on the surface facing the main body 1 along the opening/closing direction, and has a slot 5 opened above the slot 5 in the opening/closing direction. A support shaft 6 having intersecting horizontal axes is fixed. Support shaft 6
On the other hand, a locking body 8 having a pin 7 parallel to the support shaft 6 fixed at its tip and having a lower end edge as a circular arc surface 8a, and an operating body 9 forming an engaging portion 9a that can be engaged with the lower surface of the pin 7. Each is rotatably supported and receives a different elastic force in the counterclockwise direction in FIG. The arcuate portion 8a of the locking body 8 that engages with the engaging portion 9a when in the position is located below the upper end surface of the slot 5, and when the operating body 9 is in the operating position where it rotates clockwise from there, it is engaged. The pin of the stopper 8 is pushed up by the engaging portion 9a, and the arcuate portion 8a is separated above the upper end surface of the slot 5. In addition, on the main body 1 side, there is a pivot shaft 13 that rotates around a support shaft 13 having an axis parallel to the support shaft 6, facing the movement path of the slot 5 and the circular arc portion 8a of the locking body 8 due to the opening/closing operation of the appendix 3. The rotating body 14 is supported as possible.

With these configurations, when the attachment 3 is rotated from the open state to the closed state, the rotating body 14 engages the arcuate surface 8 of the locking body 8 located below the upper end surface of the slot 5.
a and pushes up, and the locking body 8 is fitted into the slot 5 while rotating clockwise. When the rotating body 14 passes through the locking body 8, the locking body 8 moves as the rotating body 14 enters. The elastic force of the coiled spring 10 causes it to rotate counterclockwise again, and the pin 7 engages with the engaging portion 9a of the operating body 9, and the locking body 8 prevents the rotating body 14 from moving in the opening direction. It was located on the path of the rotating body 14 below the upper surface of the hole 5, and the rotating body 14 was locked inside the slot 5. To open the attachment 3 again, rotate the operating body 9 clockwise to push up the pin 7 using the engaging portion 9a, and rotate the locking body 8 clockwise to align the arc portion 8a with the path of the rotating body 14. This was made possible by separating from the

However, in this conventional configuration, the portion of the rotating body 14 that engages with the lower end surface of the slot 5 and the locking body 8
Since the part that engages with the part is integrally formed,
When the rotating body 14 is inserted into the slot 5, the rotating body 14
When the locking body 8 is pushed up and when the locking body 8 returns, a clockwise rotational force is applied due to friction with the locking body 8, whereas a counterclockwise rotational force is applied due to friction with the lower end surface of the slot hole 5. The rotating body 14 cannot rotate due to the rotating force in the opposite direction, and the rotating body 14 cannot be smoothly inserted into the slot 5. 14 could not be inserted reliably, and the attachment of the appendix 3 to the main body 1 became uncertain, resulting in defects such as uneven spacing between the type holder, printing paper, etc. during printing, and deterioration of printing quality. .

This invention aims to eliminate the above-mentioned conventional drawbacks.

An embodiment of this invention will be described with reference to the drawing of FIG. 4, and the same components as those of the conventional example will be denoted by the same reference numerals and the description thereof will be omitted. Support shaft 13 supported on main body 1
The rotating body 15 has a perfectly circular outer periphery that can be fitted into the slot 5 of the support plate 4, and the rotary body 15 has a perfectly circular outer circumference that can be opposed to the arcuate portion 8a of the locking body 8 supported on the support plate 4. A rotary body 16 having an outer periphery is individually rotatably supported.

In this configuration, when the attachment 3 is rotated from the open state to the closed state, the rotating body 1 fits into the slot 5.
5 engages with the lower end surface of the slotted hole 5, and due to the friction, a rotational force is applied in the counterclockwise direction and rotates, and the locking body 8
The rotating body 16 that engages with the arcuate surface of the rotating body 16 is given a clockwise rotational force by the friction and rotates. Therefore, both rotating bodies 15 and 16 rotate in different directions, and the rotating body 15 smoothly fits into the slot 5 and is latched by the locking body 8.

Note that in this embodiment, the rotating body 1 is provided on the main body side.
5 and 16 and the support plate 4 etc. are provided on the appendage side, but conversely, the support plate 4 etc. may be provided on the main body side and the rotating bodies 15, 16 on the appendage side.

As described above, according to this invention, the rotary body 15 that fits into the slot 5 of the support body and the rotary body 16 that engages with the locking body 8 are individually rotatable about the support shaft 13. When the attachment is opened and closed, both rotating bodies rotate in opposite directions due to friction with the end face of the slot and the end face of the locking body, so that the attachment can be smoothly opened and closed to the main body and can be locked in the closed position. is ensured, and the spacing between the type holder, printing paper, etc. is always kept at a predetermined distance, resulting in the effect of improving printing quality.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a belt-type line printer, Fig. 2 is a perspective view of a conventional locking means, Fig. 3 is a front view of Fig. 2, and Fig. 4 is a perspective view of the locking means of this embodiment. It is. In the figure, 1... Main body, 3... Accessory body, 4... Support plate (support body), 13... Support shaft (support shaft), 15... Second rotating body, 16... First rotating body, 8... Locking body, 9... Operating body (locking means), 12... Pin (locking means).

Claims (1)

[Scope of Claim for Utility Model Registration] A main body 1 that movably holds printing paper and has an opening on one side of the machine frame facing the movement path of the printing paper, and An attachment 3 supported on the main body so as to be able to face the hole and be rotatable about a fixed axis so as to open and close the opening; a support body 4 having a slot 5 opened on opposite surfaces along the same direction; and a support shaft 13 supported on the other side of the main body or attached body and disposed opposite to the slot on an axis that intersects with the opening direction of the slot. , a first rotary body 15 facing the opening direction of the slot so that it can be inserted and removed and rotatably supported on the support shaft; The two rotating bodies 16 are supported rotatably around an axis parallel to the support shaft at a locking position opposite to the movement path of the second rotation body and a remote position away from the movement path, and are always in the locking position. The second rotary body is allowed to move in relation to the closing operation of the appendage, and the second rotary body is prevented from moving when the first rotary body is fitted into the deepest part of the slot. A locking device for a printer, comprising locking means 8.