JPS6014589Y2 - Typewriter error printing correction mechanism - Google Patents

Description

[Detailed description of the invention] This invention relates to a printing error correction mechanism for typewriters, and in particular, the printing mechanism is activated by the swinging action of a ribbon vibrator that raises the correction ribbon to the printing position when a character key is operated following the depression of a correction key. It is an object of the present invention to provide a printing error correction mechanism having a novel configuration in which the operational connection with the escapement mechanism is severed.

This invention will be explained in detail below with reference to the drawings.

In FIGS. 1 and 2, 1 is a correction key, which is placed on the keyboard in front of the typewriter (on the left in FIG. 1).

Reference numeral 2 designates a correction key lever to which the correction key 1 is fixed at one end, and is supported so as to be movable in the vertical direction, and its lower end is pivotally connected to one arm of a bell crank 3 which is pivotally supported on a frame (not shown). There is.

This bell crank 3 is biased clockwise in FIG. 1 by a spring 4 placed between it and the frame, and also biases the correction key 1 toward its original position.

The front end of a lever 5 is pivotally attached to the thin arm of the bell crank 3,
The rear end of the lever 5 is a shaft 6 rotatably supported by the frame.
It is pivotally connected to a bell crank 7 fixed to.

Another bell crank 8 is fixed to the center of the shaft 6 in the left-right direction of the typewriter, and the rear end of a wire 9 is connected to this bell crank 8.

The front end of the wire 9 is connected to a rotating lever 10 that is pivotally supported on the frame.
The thin arm of the rotary lever 10 extends upward to form an actuating portion 10a.

Reference numeral 11 denotes a ribbon vibrator that raises a correction ribbon 12 to the printing position for erasing erroneously printed characters; It is composed of a pair of arms 14.15 arranged on the left and right so that the arms 14.15 are connected to each other, and a connecting rod 16 that connects both arms 14.15.

This ribbon vibrator 11 is rotatably supported by a short shaft 18° 19 fixed to a frame 17, and a spring 20 is hung between it and the frame as shown in FIG.
The arms 14 and 15 are biased clockwise in FIG. .

As shown in FIG. 1, a two-armed latch lever 22 is pivotally attached to the left side surface of the right arm 15 of the ribbon vibrator 11 approximately midway between the short shaft 19 and the ribbon guide 21. As shown in FIG.

A horizontal bent portion 23 is formed on one arm extending rearward of the latch lever 22, and a notched stepped portion 2 is formed on the thin arm extending downward.
4 is formed.

The horizontal bent portion 23 is arranged so as to be able to come into contact with the upper edge of the actuating portion 10a of the rotary lever 10.

A tri-arm-shaped operating lever 25 is pivotally mounted on the right side surface of the right arm 15 in the vicinity of the latch lever 22 .

A bent portion 26 that can engage with the rear edge of the actuating portion 10a of the rotating lever 10 is formed on the first arm extending downward of the operating lever 25, and a bent portion 26 that can engage with the rear edge of the operating portion 10a of the rotating lever 10 is formed on the second arm extending forward. A hooking portion 27 that abuts the lower edge and can be hooked to the stepped portion 24 of the latch lever 22 is formed in a bent manner.

Further, the third arm extends rearward and is formed with a cam portion 28 whose distal end is curved into an arc shape.

A tension spring 29 is applied between the hook 27 of the actuating lever 25 and the horizontal bent portion 23 of the latch lever 22 to hold both levers 22.25 in the inoperative state shown in FIG. .

In FIG. 1, reference numeral 30 denotes a drive shaft disposed below the ribbon vibrator 11, which is driven one rotation each time a printing operation is performed based on the operation of a character key.

A drive cam 31 as a drive member is fixed to this drive shaft 30.

A cam follower 32 is rotatably supported by the frame 17 (FIG. 2), and a roller 33, which is in constant contact with the outer peripheral edge of the drive cam 31, is pivoted to one arm extending rearward.

The other arm of the cam follower 32 extends below the hook 27 of the operating lever 25.

In FIG. 2, 1.34 is a support shaft fixed to a frame (not shown), and this support shaft 34 is equipped with a ratchet wheel 35 having serrated teeth on the outer periphery, and a ratchet wheel 35 for each printing operation. A rotating V-shaped feed lever 36 is loosely fitted in each.

A ratchet wheel 35 is always attached to one end of the feed lever 36.
A feed pawl 37 is pivotally attached to the feed pawl 37, which is urged to mesh with the teeth of the feed pawl 37.

A take-up reel 38 is rotatably supported on the frame 39, and is used to sequentially wind up the used correction ribbon 12 that has passed through the printing section (not shown) of the typewriter.

This take-up reel 38 is connected to a power transmission mechanism 40 such as a gear train.
is connected to the ratchet wheel 35, and when the ratchet wheel 35 is rotated by a certain amount, the correction ribbon 1
It is configured to wind up a predetermined amount of 2.

A releaser 41 is rotatably supported on the frame, and has an arc-shaped cam arm 42 extending forward (leftward in FIG. 2) and an arm 43 extending near the cam portion 28 of the operating lever 25. have.

This releaser 41 is always biased and held in the release position shown by the solid line in FIG.

As shown in FIG. 5, the left arm 14 of the ribbon vibrator 11 has a pin 44 between the short shaft 18 and the ribbon guide 21.
is implanted, and the upper end of a wire 45 is connected to the pin 44.

Reference numeral 46 designates a swing lever pivotally supported by a frame (not shown), and one arm extending forward is connected to the lower end of the wire 45, and an operating arm 47 extends downward.

Reference numeral 48 denotes a print head support stand rotatably supported by a support shaft 49 fixed to a frame (not shown), which is a well-known ball-shaped printing element (see Fig. (not shown).

This printing element selects a desired type by pressing a character key, and when the print head support base 48 is swung to the printing position shown by the dashed line in FIG. The desired characters are printed on printing paper (not shown) placed on a platen 13.

The upper end of an escapement crank 50 is pivotally attached to the front left side of the print head support 48 .

A pin 51 is implanted at the lower end of the escapement crank 50 so as to pass through it, and this pin 51 is inserted into a long hole 53 of a guide lever 52 supported at the front end so as to be swingable in the vertical direction. It is arranged so as to be able to engage with the operating arm 47 of the swing lever 46.

Further, the escapement crank 50 is biased by a spring 54 hung between the print head support 48 and the pin 5.
1 is held in an operating position where it abuts the rear end edge of the elongated hole 53.

55 is an escape actuation plate pivotally supported on the frame;
The engaging portion 56 extending forward is the escapement crank 5
It is arranged above the pin 51 of 0.

An upwardly extending actuating portion 57 of the escape actuating plate 55 is operatively connected to an escapement mechanism (not shown), and allows the escape actuating plate 55 to reciprocate from the original position shown by the solid line in FIG. 5 to the actuating position shown by the dashed line. Each time a character is moved, a relative character feeding operation is performed between the platen 13 and the printing element.

The operation of the above configuration will now be described.

First, in a normal printing operation in which the correction key is not pressed, the drive cam 31 rotates and the cam follower 32 swings with the printing operation. Therefore, the ribbon vibrator 11 with the correction ribbon 12 inserted therethrough cannot be raised and remains in its original position.

Furthermore, in FIG. 5, since the swing lever 46 remains in the inoperative position shown by the solid line, when the escapement crank 50 rises during printing operation, the pin 51 swings the escape actuation plate 55, causing the escapement The mechanism is activated.

Next, a correction operation in the case of erroneous printing will be explained.

First, operate the backspace mechanism to return the erroneously printed characters to the printing position.

Next, when the correction key 1 is pressed, the rotation lever 1 is moved through the linkage of the key lever 2, bell crank 3, lever 5, etc.
0 is rotated clockwise in FIG.

As a result, the rear edge of the actuating portion 10a of the rotating lever 10 presses the bent portion 26 of the actuating lever 25, and the actuating lever 25
The hook part 2 is rotated counterclockwise against the tension spring 29.
7 is lowered to a position where it can engage with the cam follower 32.

As the rotary lever 10 rotates, the upper end of its actuating portion lea slides to the right along the lower surface of the horizontal bent portion 23 of the latch lever 22.

When the rotating lever 10 is rotated by the maximum amount, the actuating part lea is removed from the horizontal bending part 23, and the latch lever 22 is moved by the tension spring 29.
The stepped portion 24 is urged to rotate clockwise, and the stepped portion 24 engages with the latching portion 27 of the operating lever 25, which has already moved downward, resulting in the latched state shown in FIG.

Further, as the actuation lever 25 rotates, the cam portion 28 moves the releaser 41 from the release position shown by the solid line to the actuation position shown by the two-dot chain line as shown in FIG.
7 meshes with one of the teeth of the ratchet wheel 35.

In this state, when the same character key as the character previously printed by mistake is pressed and the printing operation is started, first, in the forward stroke, the drive cam 31 rotates and the cam follower 3
2 pushes up the hook 27 of the operating lever 25, the ribbon vibrator 11 is rotated around the short axis 18, 19, and the correction ribbon 12 held by the ribbon guide 21 is moved onto the platen 13 as shown in FIG. Raise it to the front printing position.

At this time, the operating portion lea of the rotating lever 10 comes off the rear edge of the horizontal bent portion 23 of the latch lever 22 and returns to its original position.

Further, as described above, the feed pawl 37 is connected to the ratchet wheel 3.
5, the ratchet wheel 35 is rotated as the feed lever 36 swings, and the take-up reel 38 connected to the wheel 35 is rotated, so that the correction ribbon 12 is wound by a predetermined amount. It is wound onto a take-up reel 38.

Further, due to the upward movement of the ribbon bi-break 11, the swing lever 46 is rotated as shown by the solid line in FIG. is moved to an inoperative position where it cannot be used.

In this state, even if the escapement crank 50 moves upward as the print head support base 48 rotates, the pin 51 does not engage the escape actuating plate 55, and therefore the escapement mechanism is not operated.

It goes without saying that the timing at which the ribbon vibrator 11 rises and moves the escapement crank 50 to the inoperative position is set earlier than the timing at which the print head support base 48 starts moving to the operating position. At this time, the same character on the printing element is printed via the correction ribbon 12, which has already been lifted, toward the incorrectly printed character on the printing paper (not shown) on the platen 13.
Erroneously printed characters are erased.

Next, in the backward stroke of this correction operation, when the ribbon vibrator 11 descends, the horizontal bent part 23 of the latch lever 22 comes into contact with the upper edge of the actuating part 10a of the rotary lever 10, and the latch lever 22 is moved by the tension spring. 29 and is rotated counterclockwise with respect to the ribbon vibrator 11.

As a result, the latching action between the stepped portion 24 of the latch lever 22 and the latching portion 27 of the operating lever 25 is released, and these levers 1G, 22, 25 return to their original positions shown in FIG.

At this time, the releaser 41, which had been held at the operating position by the cam portion 28 of the operating lever 25, returns to the release position, and the ratchet wheel 35 is prevented from rotating during the subsequent printing operation.

Furthermore, as the ribbon vibrator 11 descends, the swing lever 46 returns to the position shown by the solid line in FIG. 5, and the operative connection between the printing mechanism and the escapement mechanism via the escapement crank 50 is restored.

As described in detail above, the mechanism according to this invention utilizes the raising operation of the ribbon vibrator 11 to raise the correction ribbon 12 during the operation of erasing erroneously printed characters to interrupt the connection between the printing mechanism and the escapement mechanism. A swing lever 4 is attached to the ribbon vibrator 1 for the correction ribbon 12.
This is a printing error correction mechanism of an extremely simple structure in which the two mechanisms are connected together and the operational connection between the two mechanisms is interrupted by the operation of the swing lever 46.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the main part showing the ribbon vibrator drive section of this invention, Fig. 2 is a plan view of the main part of Fig. 1, Fig. 3 and Fig. 4 are partial operational views of Fig. 1, and Fig. 5 The figure is a reduced sectional view of the ribbon vibrator seen from the other side, and Figure 6 is the operating diagram of Figure 5.In the figure, 1 is a correction key, 11 is a ribbon vibrator, 12
is a correction ribbon, 31 is a drive cam, 46 is a swing lever, 5
0 is an escapement crank, and 55 is an escape actuation plate.

Claims (1)

[Scope of utility model registration request] A printing mechanism, an escapement mechanism, an escapement crank which is always held in an operating position to operatively connect the two mechanisms, a ribbon vibrator through which a correction ribbon is inserted, and a drive which is rotated each time a printing operation is performed. a connecting means for temporarily connecting the driving member and the ribbon vibrator when a correction key is pressed until one printing operation is completed by pressing a subsequent character key;
a swinging lever connected to the ribbon vibrator and abutting against the escapement crank to move the escapement crank to an inoperative position where the escapement mechanism is not activated when the ribbon vibrator is raised; A misprint correction mechanism for a typewriter, characterized in that when a character key subsequent to a correction key is operated, the ribbon vibrator is raised and the escapement mechanism is not activated.