JPS5825981A - Ribbon lift mechanism - Google Patents

Abstract

PURPOSE:To achieve a smaller size and a lighter weight by arranging a first electromagnet for turning a ribbon holder to the first position and a second electromagnet for turning it further to the second position in a ribbon lift mechanism provided with two kinds of ribbons. CONSTITUTION:A supporting platform 3 is supported movably on a guide shaft 2 parallel to a platen 1 along the printing line. A cassette holder 5 is pivoted rotatively in the vertical way on a support shaft 4 mounted on the supporting platform 3 and a first carbon ribbon 6 and a second correction ribbon 9 are mounted thereon. When selecting the first carbon ribbon 6, the first electromagnet 17 is excited to turn the cassette holder 5 to the first position. When selecting the correction ribbon 9, following the first electromagnet 17, the second electromagnet 19 is excited to turn the cassette holder 5 to the second position being attracted with the first electromagnet.

Description

Detailed Description of the Invention Technical Field The present invention relates to a ribbon lift mechanism for lifting a ribbon from a rest position to a predetermined operating position in a printing device such as a typewriter.
This invention relates to a ribbon lift mechanism equipped with two types of ribbons such as collection ribbons.

[1] An object of the present invention is to provide a ribbon lift mechanism that uses an electromagnet to drive the ribbon lift, and allows the use of a small, lightweight electromagnet with low power, thereby reducing costs. It's about doing.

EXAMPLE Below, an example embodying the present invention will be described with reference to the drawings.A typewriter frame (not shown) has a platen 1 rotatably supported at a predetermined position, and parallel to the platen 1. Guide shaft 2 that extends
has been erected. A support stand 3 is supported on the guide shaft 2 so as to be movable along the printing lines of the platen 1, and is configured to move step by step based on print signals from each operation key.

A cassette holder 5 as a ribbon holder is pivotally attached to a support shaft 4 installed at the upper end of the support base 3 so as to be rotatable in the vertical direction. A ribbon cassette 7 is removably attached.

A pair of left and right ribbon spools 8 (only one is shown) is supported on the cassette holder 5 on both sides of the carbon ribbon cassette 7, and a collection ribbon 9 as a second ribbon wound around one ribbon spool 8 is supported. It is guided by a pair of left and right guide pins 10 (only one of which is shown), and leads below the outwardly exposed portion of the carbon ribbon 6. Then, by appropriately selecting the amount of rotation of the cassette holder 5, the carbon ribbon 6 or the collection ribbon 9 is raised to the printing point P on the platen 1.

A rotary member 11 is rotatably supported on the support shaft 4, and a support arm 12 extending toward the platen 1 is formed at one end thereof. 1. The support arm 12 is adapted to receive the lower surface of the cassette holder 5 with a stopper rubber 13 provided at its tip. A locking arm 15 is provided at the other end of the rotating member 11 and faces a stopper 14 protruding from the rear end of the support base 3. Rotating member 1
1 is biased by a tension spring 16 in the counterclockwise direction in the drawing, that is, in the direction in which the locking arm 15 comes into contact with the stopper 14.

On one side of the rotating member 11 are character and symbol keys (not shown).
The first electromagnet 1T, which is energized based on the operation, is fixed, and when it is energized, it attracts the magnetic piece 18 fixed to the lower surface of the cassette holder 5 near the proximal end, and the cassette holder 5 is rotated clockwise in the drawing. Ru.

A second electromagnet 19 is attached to the support base 3 and is energized slightly later than the first electromagnet 17 based on the operation of a correction key (not shown), and the movable plunger 20 is connected to the connecting member. Rotating member 11 via 21
The locking arm 15 is connected to the tip of the locking arm 15. When the second electromagnet 19 is excited, the movable plunger 2
0 is retracted, and the rotating member 11 is rotated clockwise in the drawing via the connecting member 21.

The typewriter ribbon lift mechanism constructed as described above operates as follows.

Now, when not printing, as shown in FIG. 1, the first and second electromagnets 17 and 19 are demagnetized, and the tension spring 16
Due to the spring force, the rotating member 11 is held in contact with the stopper 14 of the support base 3 with its locking arm 13, and the cassette holder 5 is received by the support arm 12 due to its own weight and positioned at a downward position. . Therefore, the exposed portion of the carbon ribbon 6 and the collection ribbon 9 are placed at a rest position below the printing point P of the platen 1. In this pause state, if you selectively operate a character or symbol key while printing, the first
The electromagnet 17 is excited by a predetermined print signal, and the cassette holder 5 is rotated to the first rotation position shown in FIG. 2 by the magnetic force. For this reason, carbon ribbon 6
The exposed portion faces the printing point P of the platen 1, allowing printing of characters, symbols, etc.

Next, when the collection key is operated for collection, the first electromagnet 17 is first activated based on a predetermined signal.
is excited, and the cassette holder 5 is held at the first rotational position in the same manner as during the printing operation. In this state, the second electromagnet 19 is excited following the excitation of the first electromagnet 11, and the retracting movement of the movable plunger 20 moves the rotating member 11 in the direction of the arrow in FIG. 2 via the connecting member 21. The cassette holder 5 rotates to the second rotation position shown in FIG. 3 while being attracted to the first electromagnet 17. Therefore, the collection ribbon 9 faces the printing point P of the platen 1, and a collection operation is possible.

In this manner, according to the ribbon lift mechanism in the typewriter of this embodiment, the second electromagnet 19 for lifting the collection ribbon 9 to the printing point P is moved to the cassette holder 5 in the first rotation position. The second electromagnet 19 only needs to have a small operating capacity to rotate the electromagnet 19 to the second rotation position, and the second electromagnet 19 can be made smaller and lighter, resulting in cost reduction. Furthermore, since the weight of the entire support stand 3 is reduced, it is also possible to reduce the load on the drive motor for moving the support stand 3 step by step.

Note that the present invention is not limited to the above-mentioned embodiment, and may be embodied in a typewriter in which the platen 1 moves in steps, contrary to the above-mentioned embodiment, without departing from the spirit of the invention. It is also possible to change the configuration of each part arbitrarily and embody it.

Effects As detailed above, the present invention includes a first electromagnet that rotates a ribbon holder to a first rotating position in order to move a first ribbon to a printing position, and a first electromagnet that moves a second ribbon to a printing position. In order to move the ribbon holder, the second electromagnet is configured to move the ribbon holder, which has been moved to the first rotational position, to the second rotational position, so that the second electromagnet can be small and lightweight. This has the excellent effect of reducing costs and the like.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the ribbon lift mechanism of a typewriter embodying the present invention, FIG. 2 is a side view showing the ribbon lift mechanism with the cassette holder in the first rotational position,
FIG. 3 is a side view of the ribbon lift mechanism with the cassette holder in the second rotational position. Platen 1, support base 3, cassette holder 5, carbon ribbon 6, carbon ribbon cassette 7, collection ribbon 9, first electromagnet 17, second electromagnet 19, printing point P0

Claims (1)

[Claims] 1. A support stand (3), a ribbon holder (5) rotatably supported by the support stand (3), and a ribbon holder (5) supported by the ribbon holder (5) and always used for printing. A first ribbon (6) located below the point (P) and a second ribbon (9) located below the first ribbon (6) are provided, and the amount of rotation of the ribbon holder (5) is controlled by the amount of rotation of the ribbon holder (5). Select the appropriate number and place the first and second ribbons (6, 9) at the printing point (P).
The ribbon lift mechanism includes a rotating member (11) which is rotatably supported by the support base (3) and always positions the ribbon holder (5) at a lower position; A first electromagnet (17) is fixed to the rotation member (11) and rotates the ribbon holder (5) to a first rotation position in order to move the first ribbon (6) to the printing position. ), and the first electromagnet (17) is fixed to the support base (3) and rotates the rotating member (11) to move the second ribbon (9) to the printing position. The ribbon lift mechanism includes a second electromagnet (19) that moves the ribbon holder (5), which has been moved to the first rotational position, to the second rotational position.