JPS5925664Y2 - Typewriter ribbon cassette loading device - Google Patents

Description

[Detailed description of the invention] This invention aims to provide a ribbon cassette loading device that can reliably hang a ribbon cassette on a typewriter body, can be easily detached from the body, and has good operability. The details will be explained below with reference to the drawings.

In the figure, reference numeral 1 denotes a cassette holder, which is fixed on a carriage (not shown) supported by the typewriter body so as to be movable relative to the printing paper.

This cassette holder 1 has a substantially rectangular bottom wall 3 on which a ribbon cassette 2 is placed, a pair of side walls 4 that are continuous with the bottom wall 3 and that position the ribbon cassette 2 in the lateral direction, and a pair of side walls 4 that are continuous with each side wall 4. It is composed of a pair of front walls 5 and a rear wall 6.

A gap is formed between both left and right ends of the rear wall 6 and the rear wall of each side wall 4, and the ribbon guide portion 7 of the ribbon cassette 2 projects rearward from the gap.

A horizontal protrusion 8 facing inward is formed at the upper rear end of each side wall 4 .

Further, two openings 9 are formed in the rear wall 6, and positioning projections 1 formed on the ribbon cassette 2 as shown in FIG.
0 is inserted, the ribbon cassette 2 is positioned.

The bottom wall 3 of the cassette holder 1 has a stepped portion 11 formed at a right rear portion thereof which is lower than the other portion.

A through hole 12 is formed in the stepped portion 11, and a drive shaft (not shown) connects a ribbon drive mechanism (not shown) provided on the carriage and a ribbon feed roller (not shown) in the Novov cassette 2. ) is inserted.

Further, a pair of support parts 13 protruding forward are formed on the front wall 5 so as to have a gap 14 in the center.

As shown in FIG. 2, both ends of a rotating shaft 15 are fixed below both supporting parts 13 so as to bridge the gap 14.

A manual operation lever 17 having both side walls 16 and having a substantially U-shaped longitudinal section is rotatably supported on the rotation shaft 15 .

An arc-shaped guide hole 18 centered on the rotation shaft 15 is formed in both side walls 16, and a guide shaft 19 passing through the guide hole 18 is arranged such that both ends of the guide shaft 19 are fixed to the support portion 13, respectively. has been done.

The amount of rotation of the manual operation lever 17 is regulated by the guide hole 18 and the guide shaft 19.

A hook-shaped hook portion 20 is formed on the rear surface of the manual operation lever 17 and projects rearward (to the right in FIG. 2).

This hooking portion 20 can engage with a hook-shaped hooked portion 21 formed at the rear end of the outer wall of the ribbon cassette 2.

Reference numeral 22 denotes a cassette floating member whose one end is rotatably supported by the rotation shaft 15, and has a front protrusion 23 that can be engaged with the bottom wall of the manual operation lever 17, and whose other end is connected to the bottom wall of the cassette holder 1. It extends rearward along the step portion 11 of No. 3.

Reference numeral 24 denotes a biasing spring, whose intermediate portion is wound around the rotating shaft 15, and whose one end is hooked to the upper surface of the front protruding portion 23 of the cassette floating member 22 and the other end is hooked to the inner wall of the manual operation lever 17. ing.

In an apparatus having such a configuration, when storing the ribbon cassette 2 in the cassette holder 1, the positioning protrusion 10 formed at the rear of the ribbon cassette 2 is inserted into the opening 9 of the cassette holder 1, and the rear part of the ribbon cassette 2 is inserted into the opening 9 of the ribbon cassette 2. is inserted between the bottom wall 3 and the protrusion 8 of the side wall 4 of the cassette holder 1 to bring the ribbon cassette 2 into the state shown in FIG.

Next, when the front end of the ribbon cassette 2 is pushed down, the latched portion 21 of the ribbon cassette 2 and the manual operation lever 1
Due to the mutual cam action of the locking portion 20 of 7, the manual operation lever 17 is rotated counterclockwise in FIG. 3 against the spring force of the biasing spring 24.

When the latched portion 21 has climbed over the latched portion 20, the manual operation lever 17 is rotated clockwise by the biasing spring 24, and the latched portion 20 and the latched portion 21 are held in a latched state. .

At this time, the cassette floating member 22 is pushed by the bottom of the ribbon force set 1-2, rotated clockwise against the biasing force of the biasing spring 24, and is maintained in the state shown in FIG.

Next, when removing the ribbon cassette 2 from the cassette holder 1, the manual operating lever 17 is rotated counterclockwise against the biasing spring 24 from the state shown in FIG. 2
0 and the latched portion 21 is released.

The cassette floating member 22 acts to constantly float the ribbon cassette 2 due to the biasing spring 24, and in conjunction with the counterclockwise rotation of the manual operation lever 17, the ribbon cassette 2 is moved to the positioning protrusion 10. Centering on the front end, float it to the position shown in FIG. 3.

As described in detail above, this invention reliably engages the engaging part 20 of the manual operation lever 17 on the cassette holder side and the engaged part 21 of the ribbon cassette 2 by the biasing force of the biasing spring 24, and Since the front end of the ribbon cassette 2 is configured to float above the bottom wall 3 of the cassette holder 1 by the biasing force of the biasing spring 24 when the latching state between the latching part 20 and the latched part 21 is released, To provide a ribbon cassette loading device which has a simple configuration, allows extremely easy loading and unloading of the ribbon cassette 2, and has good operability.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a partially broken main part of an embodiment of this invention, FIG. 2 is a central vertical sectional view of the assembled state, and FIG. 3 is an explanatory view of the operation. In the figure, 1 is a cassette holder, 2 is a ribbon cassette, 1
5 is a rotating shaft, 17 is a manual operation lever, 20 is a latch part, 2
Reference numeral 1 designates a hooked portion, 22 a cassette floating member, and 24 a biasing spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A typewriter that includes a ribbon cassette that has a hooked part on the outer wall and has four compartments for printing ribbon inside, and a cassette holder that stores and holds the ribbon cassette. , a manual operating member rotatably supported by the cassette holder and having a latching portion that can be latched with the latched portion; a cassette floating member supported rotatably around the ribbon cassette, the other end of which is extended so as to be engageable with the bottom wall of the ribbon cassette; 1. Provided between the upper member and the manual operation member, the cassette is provided with a rotational force to the other end of the floating member in the direction of constantly levitating the cassette stored in the cassette holder, and the manual operation member The latching portion and the latched portion may include a biasing member that applies a biasing force to maintain the latched state, and the manual operation member rotates against the biasing force of the biasing member. When the latched portion and the latched portion are released from the latched state, the other end of the cassette floating member floats the ribbon cassette based on the biasing force of the biasing member. A typewriter ribbon cassette mounting device characterized by: