JPS6024594Y2 - typewriter - Google Patents

Description

[Detailed Description of the Invention] Technical Field and Purpose of the Invention This invention consists of a plurality of letter key levers, a swinging claw whose claw portion moves to an operating position by abutting the key levers when the key levers are pressed down, and each swinging claw. A spring that urges the movable claw to move upward in the front part engages with a claw portion of the swinging claw that is moved in response to the depression of the key lever, and the swinging claw resists the spring force of the spring. The present invention relates to a typewriter comprising a drive shaft that makes a swinging motion, and a type bar that is connected to the swinging claw of the drive shaft through a connecting means, and that performs a printing operation by transmitting the swinging motion. The purpose is to provide a typewriter which can be manufactured at low cost by reducing the number of parts and yet can reliably prevent over-striking.

EXAMPLE Hereinafter, an example embodying this invention will be described with reference to the drawings. (the right side in Fig. 1 is the front), a large number of character key levers 2 integrally formed of a resin material are arranged and fixed in parallel at a mounting part 3 at the rear end, and these character key levers 2 are fixed to the lower end of the mounting part 3. Each of them can be pressed down by a thin flexible portion 4 provided therein.

An operating key 5 is provided on the top surface of each character key lever 2, and an engaging protrusion 2a is provided protruding from the rear bottom surface.
A locking protrusion 2b is provided protruding from the front side surface.

In addition, an equi-contact part 6 is vertically provided on the front lower surface of each character key lever 2, and is difficult to deform in the direction in which the character key lever 2 is pressed down.
That is, when the character key lever 2 is pressed down, it is subjected to buckling stress, and is formed into a thin plate shape so that it can be easily elastically deformed in the front-rear direction orthogonal to the direction in which the character key lever 2 is pressed down.

A large number of spring members 7 are attached at their base ends to the upper surface of the lower part of the mounting frame 1 so as to correspond to the engaging protrusions 2a of each character key lever 2, and urge each character key lever 2 upward. ing.

A regulating frame 8 is installed on the frame of the typewriter below the front of the character key lever 2, and the regulating frame 8 has a guide slit 8a for guiding and regulating the pressing direction of the character key lever 2, and a guide slit 8a for guiding and regulating the pressing direction of the character key lever 2. A locking portion 8b that engages with the projection 2b to restrict the upper position of each character key lever 2 based on the spring member 7 is provided.

A support shaft 9 is installed on the machine frame behind the character key lever 2, and a plurality of bell cranks 10 are mounted on the support shaft 9 so as to correspond to each character key lever 2, respectively.
is rotatably supported.

A contact portion 10a is provided at the front portion of each 10 to protrude upward, and corresponds to the lower surface of the mounting frame 1 so as to be able to come into contact with and separate from it.

On the frame of the machine behind the bell crank 10 there are printed letters 1.
A number of type bars 12 having 2a are arranged, which type bars 12 are connected to each corresponding bell crank 10 via a connecting link 11.

A swing claw 13 is supported at the upper rear end of the lower part of each bell crank 10 so as to correspond to each character key lever 2, and a pressing protrusion 13a is supported at the lower rear end of the swing claw 13.
is provided to protrude rearward, and a claw portion 13b is provided on the upper portion.
The force is uniform and protrudes downward.

An L-shaped engaging portion 14 is suspended from the lower surface of the swing claw 13 so as to correspond to the abutting portion 6 of the character key lever 2, and an engaging protrusion 14a is protruded from the lower surface thereof. A stepped portion 14b is formed on the upper surface of the front portion and is removably engaged with the contact portion 6 of the character key lever 2.

A large number of swing claw return springs 15 are attached to the machine frame at their base ends so as to individually engage with the pressing protrusions 13a at the rear of each swing claw 13. 1
3 toward the upper front.

Further, at a position substantially directly below the claw portion 13b of the swinging claw 13, a drive shaft 16 having an axis perpendicular to the swinging plane of the swinging claw 13 is mounted on the machine frame and constantly rotates counterclockwise in FIG. The claw portion 1 is supported on the circumferential side of the drive shaft 16.
An engaging protrusion 16a that can be engaged with and detached from the engagement protrusion 3b is provided.

A swinging claw regulating frame 17 is installed on the machine frame below the swinging claw 13, and the regulating frame 17 includes a guide ring 17a for guiding and regulating the back and forth movement of the engaging portion 14 of the swinging claw 13. ,
A regulating portion 17b is provided which engages with the engaging protrusion 14a of the engaging portion 14 to regulate the position in which the swing pawl 13 is pressed down by the character key lever 2.

Next, the operation of the typewriter constructed as described above will be explained.

Now, when any key 5 is selected and the character key lever 2 is pressed down, the engaging part 14 of the swing claw 13 corresponding to the selected key 5 is pushed downward by the contact part 6 of the character key lever 2. The swing claw 13 is pushed down to the operating position of
The claw portion 13b is engaged with the engagement protrusion 16a of the drive shaft 16, and the swinging claw 13 is blown rearward against the swinging claw return spring 15 to the position shown in chain lines in FIG.

As a result, the bell crank 10 is rotated clockwise,
The type bar 12 is rotated via the connecting link 11 to perform a printing operation.

When this printing operation is completed, the spring force of the swing claw return spring 15 returns the swing claw 13 to its original position.

As shown in FIG. 2, even if the character key lever 2 is still in the depressed state when the swing claw 13 returns,
The contact part 6 of the character key lever 2 is the step part 14b of the swinging claw 13
Since the swinging claw 13 is engaged with the spring 15 and curved in the front-back direction by the spring force of the spring 15, the swinging claw 13 will not be pushed down again, and overprinting of characters is reliably prevented.

On the other hand, the impact given to the typist via the character key lever 2 is also significantly reduced.

When the character key lever 2 is returned to its original upper position from this state, the abutting portion 6 is restored and its lower end is returned to a position corresponding to the upper surface of the engaging portion 14 of the swing pawl 13.

Effects of the invention As detailed above, the key lever of the typewriter of this invention is integrally molded from a resin material, including the contact part with the swinging claw, and the contact part is not used to press down the character key lever. It is difficult to deform in the direction <, and when pressed, it is formed into a plate shape that is easily deformed in the front and rear directions, and when the character key lever is continuously pressed during operation, the spring force of the spring is applied after the printing operation is completed. Based on this, the abutment part is deformed in the front-back direction through engagement with the swinging claw, so that the swinging claw is returned to the upper part of the front part, thereby reducing the number of parts and reducing the cost. Even though it can be manufactured, it has the excellent effect of reliably preventing overlapping.

[Brief explanation of drawings]

FIG. 1 is a side sectional view showing an embodiment of the key lever of a typewriter of this invention, and FIG. 2 is a side sectional view of the main part similarly showing the operating state. Character key lever 2, contact part 6, bell crank 10, type bar 12, connecting link 11, swinging claw 13, claw part 13b
1 Swing claw return spring 15, drive shaft 16°

Claims (1)

[Claims for Utility Model Registration] A plurality of character key levers 2 are provided correspondingly to each of them, and when the corresponding character key lever 2 is pressed down, the character key lever 2 comes into contact with the character key lever 2 and is pressed down. A swinging claw 13 whose claw portion 13b moves to the operating position, and a spring 1 which biases each swinging claw 13 to move upward in the front part.
5, and a drive that engages with the claw portion 13b of the swinging claw 13 moved in response to the depression of the character key lever 2, and causing the swinging claw 13 to swing against the spring force of the spring 15. In a typewriter comprising a shaft 16 and a type bar 12 that performs a printing operation by transmitting the swinging movement of its swinging pawl 13 via coupling means 10, 11, etc., the character lever 2 is It is integrally molded from a resin material, including the abutting part 6 with the movable pawl 13, and the abutting part 6 is bent along the depressing direction so as to receive buckling stress when the character key lever 2 is depressed. It is formed into a plate shape that extends in a straight line and is easily deformed in the front-rear direction perpendicular to the pressing down, and when the character key lever 2 is continuously pressed, it oscillates based on the spring force of the spring 15 after the printing operation is completed. A typewriter 0 characterized in that the abutting portion 6 is deformed in the front-rear direction through engagement with the movable claw 13, so that the swinging claw 13 is returned to the upper front direction.