JPS5928847Y2 - Typewriter print head attachment/detachment device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a print head attachment/detachment device for a single print head typewriter.The purpose of this invention is to have a simple structure and to make it easy to attach/detach the print head. To provide an attachment/detachment device which can perform a print head and firmly fix a print head.

Hereinafter, an embodiment embodying the present invention will be explained with reference to FIGS. (not shown) is placed upright on the printing part of the plantain (not shown).
The key lever (
(not shown) is a support shaft that can be selectively rotated around the axis and swung in the direction of the platen, and has a groove 2 on the outer periphery of its upper end. Groove 2
A large-diameter mounting part 3 is formed at the bottom of the mounting part 3, and a disc-shaped locking part 4 is formed at the bottom of the mounting part 3. A slope 2a is formed.

Reference numeral 5 denotes a print head attached to the support shaft 1, which has a large number of characters 6 engraved on its outer circumferential surface, has a spherical shell shape with a flat surface 7 at its upper end, and has a vertically penetrating hole in its center. A through hole 8 is provided, and a portion of the through hole 8 is attached to the mounting portion 3 of the support shaft 1, and the lower end of the through hole 8 is brought into contact with the locking portion 4. The portion where 2 is formed protrudes from the upper end of the through hole 8.

Reference numeral 9 denotes a key groove formed on the inner peripheral surface of the lower part of the through hole 8, and the print head 5 and the support shaft 1 are connected by fitting into a key 10 protruding from the mounting portion 3 of the support shaft 1. Alignment should be done.

Reference numeral 11 denotes a hollow camp fixed on the flat part γ of the printing hand 5, and as shown in FIGS. 2a and 2b, the planar shape is approximately semicircular. The upper end is almost hidden inside this hollow shape.

Reference numeral 12 denotes an operating piece formed in a substantially semicircular shape to substantially cover the flat part T of the print head 5 in accordance with the planar shape of the camp 11, and is integrated with a hooking piece 13 arranged at the lower part of the operating piece. It is pivotally mounted on the flat surface γ of the print head 5 so that it can be rotated within a plane substantially parallel to the flat surface γ of the print head 5.

The latching piece 13 has a hook-shaped notch facing toward the support shaft 1 at a height that includes the boundary between the concave groove 2 of the support shaft 1 and its tapered slope 2a, and forms a notch with the support shaft 1. Two surfaces 13a facing each other.

Since the notches 13b are formed with different curvatures, the notches are narrowed inwardly in a wedge-like manner, and furthermore, the deep part 13c of the notches 13b is formed with different curvatures.
The tip of 3 is cut so that it can elastically rotate and the wedge-shaped interval can be expanded.

Reference numeral 14 denotes an engaging convex portion formed on the lower surface of the tip of the operation piece 12, and when the operation piece 12 is in a position forming a substantially circular shape with the camp 11 as shown in FIG. engages with a locking recess 15 provided in the flat part γ,
Prevents the operation piece 12 from rotating counterclockwise in the figure.

In the above configuration, when the operating piece 12 on the print head 5 is in the state shown in FIG. 2a, the locking piece 1
3 elastically clamps the vicinity of the concave groove 2 of the support shaft 1 with its notch, and the clamping action causes the engagement convex part 14 and the locking concave part 1
The print head 5 is held by a click stomp mechanism consisting of 5, and is prevented from separating from the support shaft 1.

In order to remove the print head 5 which is in such a detachment-preventing state as shown in Figure 2, the operation piece 12 is rotated counterclockwise in the figure against the holding force of the Klinxt knob mechanism. This rotation operation can be performed by inserting the fingertip into the recess 16 formed between the camp 11 and the rotation tip of the operation piece 12 in FIG. 2a.
In the state shown in FIG. 2, the print head 5 can be removed from the support shaft 1 without being obstructed by the latching piece 13.

FIG. 3 shows a mechanism in which cam surfaces 13d and 13d' that engage with the vicinity of the groove 2 of the support shaft 1 are formed in the notch of the locking piece 13 instead of the above-mentioned clink stop mechanism. It is advantageous when the hooking piece 13 is made of a synthetic resin material because its good workability and elasticity can be fully utilized, and in that case, it is also possible to form it integrally with the operating piece 12. Yes, the entire print head can be configured inexpensively.

In this way, the present invention forms a groove on the outer periphery of the upper end of the support shaft for supporting the print head of a typewriter, and when the print head is installed, this groove protrudes from the upper end of the print head. One end is rotatably pivoted on the upper end of the print head in a plane substantially parallel to the upper end plane, and the other end has a notch that can be engaged with the groove. This typewriter has a hooking member and maintains the engagement between the hooking member and the recessed groove, and is extremely simple compared to conventional typewriters and is easy to attach and detach. This is the realization of a head attachment/detachment device, and it is the key to its practical effects.

Note that the present invention is not limited to the above-described embodiment; for example, the camp 11 and the operating piece 12 may be eliminated, and the locking piece 13 may be rotatably operated directly, or the locking piece may be provided with elasticity. It goes without saying that various modifications are possible, such as not holding the latch piece but elastically pressing the latch piece to maintain the state of engagement between the latch piece and the groove of the support shaft.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the main parts of a typewriter print head attaching/detaching device according to the present invention, Figs. FIG. In the figure, 1 is the support shaft, 2 is its groove, 5 is the print head, 1
3 is a latching member, 13a and 13b are faces forming notches thereof, 13d and 13d' are cam surfaces, and 14.15 is an engaging protrusion and a locking recess of a clickstone knob mechanism forming a holding mechanism. .

Claims (1)

[Claims for Utility Model Registration] 1. A support shaft which is arranged to be movable relative to the platen in the longitudinal direction of the platen within the main body of the typewriter, and which has a groove formed on the outer periphery of its upper end; A through hole into which the support shaft is inserted from below is provided in the center of the area where characters are engraved, and a concave groove portion of the support shaft protrudes from the upper end of the through hole. A shaft is rotatably supported at the upper end in a plane substantially parallel to the upper end plane, and the other end is engageable with a concave groove of the support shaft protruding from the upper end of the through hole of the printing head. a latching member having a notch formed therein; and latching so that the latching member is retained in a rotational position where the notch of the latching member and the groove of the support shaft engage with each other. a retaining mechanism formed between the member and the print head or the support shaft, the retaining member is rotated against the retaining force of the retaining mechanism, and the notch is inserted into the groove of the support shaft. A print head attachment/detachment device for a typewriter, characterized in that it can be removed more easily. 2. The printing hand for a typewriter according to claim 1, wherein the holding mechanism includes a clink stop mechanism provided between the printing head and the hooking member. Attachment and detachment device. 3. Attaching and detaching the print head of a typewriter according to claim 1, wherein the notch of the hooking member is formed with a cam surface that engages with the groove of the support shaft. Device.