JPS64234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a typewriter with a manual erasing function that erases characters printed on printing paper based on pressing of a character key.

[Prior art]

Conventionally, in this type of typewriter, when manually correcting an erroneously printed character, the print head is placed opposite to the erroneously printed character, a correction key is operated, and then a character key corresponding to the erroneously printed character is pressed. As a result, the correction ribbon is swung to a printing position facing the erroneously printed character, and the type element corresponding to the character key is struck against the erroneously printed character through the correction ribbon to erase the character, and then the correction ribbon is returned to its original position. It was returned to its position.

[Problem that the invention seeks to solve]

However, when erasing consecutive erroneously printed characters, it is necessary to perform the above operation, move the print head to face the next erroneously printed character, and perform the erasing operation using the same operating procedure as above. , it was very difficult to operate.

[Purpose of the invention]

This invention was made in order to solve the above-mentioned problems, and its purpose is to provide an extremely easy-to-operate typewriter that can set the erasing mode according to the situation of the misprinted characters that you want to erase. It is something to do.

[Means for solving problems]

In order to achieve this object, the typewriter with a manual erasing function of the present invention includes a printing mechanism that prints on printing paper based on the pressing of a character key, and an erasing ribbon that prints on printing paper based on the pressing of a character key. Select an erasing mechanism that erases the corresponding characters on the printing paper, a movement mechanism that can move the printing paper, the printing mechanism, and the erasing mechanism relative to each other in conjunction with the erasing operation, and a first erasing mode and a second erasing mode. mode setting means for setting, mode canceling means for canceling the second erase mode, canceling the first erase mode after the erase operation when setting the first erase mode, and interlocking with the erase operation when setting the second erase mode. and an erase control means that operates the moving mechanism and maintains the second erase mode, and releases the second erase mode by operating the mode release means.

[Effect]

In the typewriter with a manual erasing function according to the present invention, the printing mechanism prints on the printing paper based on the pressing of a character key. In addition, when erasing a misprinted character, the first erasing mode or the second erasing mode is set as appropriate by the selection means depending on the situation of the misprinting, and the erasing ribbon is erased based on the press of a character key. The erasing mechanism erases the incorrectly printed characters on the printing paper.

When the first erase mode is set, the erase control means cancels the first erase mode after the erase operation by the erase mechanism. Further, when setting the second erasing mode, the moving mechanism is operated in conjunction with the erasing operation by the erasing mechanism, and the second erasing mode is maintained so that the erasing operation can be performed continuously. The second erase mode is canceled.

〔Example〕

An embodiment embodying the present invention will be described below with reference to the drawings.A well-known platen (not shown) is mounted on the upper part of the carriage, which is supported movably in the left and right directions on a board provided at the rear of the machine frame. A support base 2 is rotatably supported by a support shaft 1 in front of the support shaft 1. On the support stand 2, a nearly spherical print head 3 having a large number of type characters arranged on its outer circumferential surface is supported so as to be tiltable and rotatable.
Based on the selection operation of a large number of character keys arranged at the front of the machine frame, one character on the printing head 3 is selected so as to face the printing surface on the platen,
As the support base 2 is rotated thereafter, the selected characters are printed on the printing paper on the platen via a normal ink ribbon.

Next, an explanation will be given of the escapement mechanism for moving the carriage step by step in the character feeding direction based on the printing operation. A pinion (not shown) that meshes with a plate (not shown) is fixed, and a ratchet wheel 5 for moving the carriage at a predetermined pitch is fixed on the same axis, and is energized by an appropriate biasing means (not shown). Based on the biasing force applied to the carriage in the character feeding direction, the carriage is biased to rotate in the direction of the arrow in FIG. 1 via the rack plate and pinion.

A biarm-shaped holding claw body 7 is rotatably supported on a support shaft 6 extending parallel to the rotation shaft 4 at the rear of the ratchet wheel 5. A pawl portion 8 that can engage with the ratchet wheel 5 is formed, and the other arm portion 7b extends to the opposite side from the one arm portion 7a.

A tri-arm-shaped feeding claw body 9 is supported on the support shaft 6 so as to be able to rotate coaxially with the holding claw body 7, and the first arm portion 9a of the triarm-shaped feed claw body 9 and one arm portion 7a of the holding claw body 7 are connected to each other. A tension spring 10 is hung between the first arm portion 9a, and a claw portion 11 is provided on the first arm portion 9a. It is designed to mesh with the wheel 5.

An eccentric screw 12 is fixed to the second arm portion 9b of the feed claw body 9, so that it can be engaged with the other arm portion 7b of the holding claw body 7. Therefore, both claw bodies 7 and 9 are always maintained in an engaged state by the action of the tension spring 10 and can rotate integrally. Further, the third arm portion 9c of the feed claw body 9 is attached to one side of the first crank 13, which is rotatably supported on the left side of the support shaft 6 on an axis extending parallel to the support shaft 6. , and rotates clockwise as the first crank 13 rotates.

A support shaft 6 is provided in front of the first crank 13.
A second crank 14 is rotatably supported on an axis extending in a direction perpendicular to the second crank 14, and one arm portion 14a of the second crank 14 engages with the other side of the first crank 13,
The first crank 13 rotates following the rotation of the second crank 14. The other arm portion 14b of the second crank 14 is provided with a notch 15, and an escape pin 17 screwed onto one side of the support base 2 via a link 16 is always engaged by a tension spring Z. It's starting to match.

Therefore, when the support base 2 is rotated counterclockwise to perform a printing operation, the first and second cranks 1 are moved by the movement of the escape pin 17.
Both pawls 7 and 9 are integrally rotated clockwise via 3 and 14, and the engagement relationship of both pawls 8 and 11 with respect to the ratchet wheel 5 is switched, and the carriage is moved half a pitch in the character feeding direction. Then, as the support base 2 is rotated back, both claw bodies 7,
9 is rotated back to the original position shown in FIG. 1, and the carriage is further moved by half a pitch. By repeating this operation, the carriage moves one pitch at a time in the character feed direction for each printing operation of the print head 3. The print position on the print paper is updated accordingly. Note that the escapement mechanism constitutes a moving mechanism.

Next, the configuration of the erasing mechanism for erasing characters when erroneous printing is performed will be described. On the front surface of the platen, there are a pair of arms 18a extending on both sides of the printing head 3 so as to sandwich the printing head 3.
18b and a connecting rod 18c connecting both arms 18a, 18b, the ribbon vibrator 18 is rotatably supported, and is configured to hold the erasing ribbon CR at the upper ends of both arms 18a, 18b. , is biased clockwise by a tension spring 19 provided at the lower end of one arm 18a.

A cam follower 21 that can be engaged with a cam 20 that rotates when all the character keys (not shown) are pressed is protruded from the lower side surface of one arm 18a, and the upper side surface is provided with two cam followers 21. Engagement pins 22 and 23 are provided in a protruding manner.

Below the ribbon vibrator 18, on an axis extending parallel to its rotational axis, an erasing actuation member 24 having an approximately inverted U-shape in front is rotatably supported, and an arc-shaped notch is provided at the lower end of the erasing actuating member 24. 24a is formed and is urged to rotate counterclockwise by a tension spring 25, so that the tip of the one side arm portion 26 is removably engaged with the one arm 18a of the ribbon vibrator 18. . Further, an engagement piece 28 is formed at the tip of the other side arm part 27 extending on the opposite side of the one side arm part 26, and the other side arm part 27
An operating arm 29 is formed to protrude downward from approximately the center.

A releaser 30 is rotatably supported inside and coaxially with the erasing actuating member 24, and a bent piece 30a formed near the tip of the releaser 30 separates from the engagement piece 28 of the erasing actuating member 24. They are designed to be able to engage with each other, and their rotational range is restricted by a stopper 31 fixed to the machine frame, as shown in FIG.

A lock link 32 is rotatably disposed between the ribbon vibrator 18 and the erasing actuating member 24, and is biased clockwise by a tension spring 33 suspended between the ribbon vibrator 18 and the erasing actuating member 24. The upper end cam surface 32a can be engaged with one of the engagement pins 22 of the ribbon vibrator 18. A locking step portion 3 is provided at the lower end of this lock link 32.
2b and an arc-shaped cam portion 32c continuous above it.
is formed. As shown in FIG. 3, the bent piece 30a of the releaser 30 is always engaged with the lower end of the lock link 32, and the erasing actuating member 24 is engaged with the lower end of the lock link 32.
The engaging piece 28 is adapted to engage with one side of the lower part of the lock link 32.

An escape release crank 34 is rotatably disposed behind the lock link 32, and is biased to rotate counterclockwise by a tension spring 35, and one arm portion 34a of the crank 34 is rotatably disposed behind the lock link 32. 18 , and can rotate following the rotation of the ribbon vibrator 18 .

An escape release link 36 is rotatably supported at the lower end of the other arm portion 34b of the crank 34, and a pin 36a, which is usually provided approximately in the center, is provided near the lower end of the other arm portion 34b. The protruding piece 34c is held in an engaged state. Further, this pin 36a is located within the rotation range of the operating arm 29 of the erasing operating member 24, and when the erasing operating member 24 is rotated to the second movement position shown in FIG. The actuating member 24 is adapted to engage with the actuating member 24 .

An escape pin 17 provided on one side of the support base 2 is disposed in front of the escape release link 36, and is always in contact with one side of the escape release link 36.

Next, to explain the operation procedure for erasing, a correction key 37 for setting the single character erasing state is rotatably supported at one end of the key lever at the front of the machine frame, and a bendable key lever 37 is supported at the other end. A portion 37a is formed. A rod 38 is installed between the bent portion 37a and the notch 24a of the erasing actuating member 24, and is biased forward by a tension spring 39. A space S is normally formed between the engaging portion 38a formed on a portion of the rod 38 and the bent portion 37a of the correction key 37.

Adjacent to the correction key 37, a single character erasing state (first erasing mode) and a continuous character erasing state (second erasing mode) are arranged.
Erase mode) or one of the states (mode)
A switching member 40, which is a selection means of the present invention for selectively setting , is rotatably supported, and has a pin 40a protruding from the tip of its arm. The switching member 40 is held in the two switching states by the action of the toggle spring 41.

An operating link 42 for erasing continuous characters is rotatably disposed behind the correction key 37, and the pin 40a engages with the groove 42a at the upper end of the link 42, and the bending of the rod 38 engages with the protrusion 42b at the lower end. The portion 38b is adapted to engage.

Therefore, when erasing a single character, after manually operating the switching member 40 to set the forward single character erasing state (first erasing mode) shown in FIG. 2, press the correction key 37. , the bent portion 3
7a engages with the engaging portion 38a of the rod 38, and the rod 38 is moved rearward against the spring force of the tension spring 39. Note that the rod 38 is immediately returned to its original position by the tension spring 39 at the same time as the correction key 37 is released from the press. When erasing continuous characters, the switching member 40 is rotated counterclockwise from the state shown in FIG. 2 to switch to the backward continuous character erasing state (second erasing mode). The operating link 4 follows the rotation of the switching member 40.
2 rotates, and the engagement of the actuating link 42 with the rod 38 causes the rod 38 to be moved rearward by a predetermined amount.

Note that the amount of movement of the rod 38 is set to be larger when erasing consecutive characters than when erasing single characters, so when the second erasing mode is set, the space S is expanded and single characters can be erased. Even if the correction key 37 for deletion is pressed, the bent portion 37
a does not engage with the engaging portion 38a of the rod 38, and the continuous erasing mode is maintained.

Next, the operation of the erasing mechanism operated by the erasing operating means will be explained.

Now, if only one character is printed incorrectly, press the backspace key (not shown) to return the printing paper on the platen that has been advanced in the character feeding direction to its original position. Set the switching member 40 to the first erasing mode as shown in FIG.
7, the erasing actuating member 24 is rotated clockwise as the rod 38 moves from the rest position shown in FIG. 3 to the first moving position shown in FIG. The engaging piece 28 of the portion 27 engages with the locking stepped portion 32b of the lock link 32, resulting in a locked state. At this time, the releaser 30 and the lock link 32 are maintained in an engaged state.

Further, due to the rotation of the erasing actuating member 24, the engagement between the one side arm portion 26 and the lower end of one arm 18a of the ribbon vibrator 18 is disengaged, and the tension spring 1
9 causes the ribbon vibrator 18 to move to the second position.
The ribbon vibrator 18 is rotated clockwise from the state shown in the figure, and the cam follower 21 is engaged with the cam 20, and the ribbon vibrator 18 is set in a state where it can be moved from the rest position to the operating position.

Thereafter, in order to erase the erroneously printed character, when the character key is pressed down again to perform the printing operation, the cam 20 is rotated and the ribbon vibrator 18 is raised to the operating position via the cam follower 21. Erasing ribbon CR supported at its tip
The characters will be deleted. At this time, the escape release crank 34 is rotated counterclockwise following the upward movement of the ribbon vibrator 18 due to the engagement between the engagement pin 23 and one arm portion 34a, and the escape release link 36 pin 36a and the protruding piece 34c of the crank 34, the link 36 is rotated integrally with the crank 34, and the escape pin 17 in contact with one side of the link 36 is rotated by the urging force of the tension spring Z. is moved forward against the As a result, the escape pin 17 separates forward from the notch 15 of the second crank 14 in the escapement mechanism shown in FIG. 1, and the escapement mechanism is disabled.
Therefore, during the printing operation based on the operation of the character keys, the printing paper on the platen is not advanced in the character feeding direction.

After the erroneously printed characters are erased,
When the ribbon vibrator 18 is returned to the rest position, the lock link 32 is rotated counterclockwise due to the engagement between the engagement pin 22 and the cam surface 32a of the lock link 32, and the locking step 32b and the eraser are rotated. The engagement piece 28 of the actuating member 24 is disengaged, and the lock link 32 and the erasing actuating member 24 are moved to the second position.
Each returns to the rest position shown in FIG. Further, the escape release crank 34 is rotated back clockwise by the return movement of the ribbon vibrator 18, and the escape release link 36 is returned to the original position shown in FIG. 3 together with the escape pin 17. The pin 17 is returned to engage with the notch 15 of the second crank 14, and the escapement mechanism is activated. Therefore, based on the subsequent depression of the character key, a normal printing operation using the ink ribbon is performed with a stepwise operation.

In addition, if a large number of characters are printed incorrectly in a row, press and hold the backspace key repeatedly to return the printing paper on the platen to the first printing position where the printing errors occurred in a row. After that, when the switching member 40 is set to the rear second erasing mode, the erasing actuating member 24 moves from the rest position shown in FIG. 3 to the first moving position shown in FIG. 4 as the rod 38 moves. Then, it is largely rotated to the second movement position shown in FIG. As a result of this rotation, the engagement piece 28 of the other side arm portion 27 engages with the arcuate cam portion 32c of the lock link 32, and the lock link 32 is rotated counterclockwise, so that the lower end of the lock link 32 is rotated counterclockwise. and bent piece 30 of releaser 30
The engagement with a is released. As a result, the releaser 30 is rotated clockwise by the action of the tension spring 33, and the bent piece 3 of the releaser 30 is rotated as shown in FIG.
0a engages with one side of the lower part of the lock link 32, and at the engaged position, the rotation of the releaser 30 is restricted by the stopper 31.

Further, as in the first erasing mode, the engagement between the one side arm portion 26 and one arm 18a of the ribbon vibrator 18 is released as the erasing operating member 24 rotates, so the ribbon vibrator 18 is stopped. It is set in a state where it can be moved from the position to the operating position. Further, as the erasing actuating member 24 rotates to the second movement position, the operating arm 29 moves to the escape release link 36 as shown by the two-dot chain line in FIG.
It engages with the upper pin 36a, and the link 36 is rotated clockwise to separate from the escape pin 17.

Therefore, in this state, when a character key corresponding to a large number of characters that have been printed incorrectly in succession is pressed down to perform a printing operation, the ribbon vibrator 18 follows the rotation of the cam 20 and operates from the rest position. It is raised to the position and the characters are erased using the erasing ribbon CR. At this time, as the ribbon vibrator 18 moves upward, the escape release crank 34 and the escape release link 36 are rotated widely counterclockwise in FIG. 17, the pin 17 is not moved and the escapement mechanism is in an enabled state.

Further, even if the lock link 32 is rotated counterclockwise from the state shown in FIG. 5 due to the engagement between the engagement pin 22 and the cam surface 32a as the ribbon vibrator 18 is lowered, the switching member 40 will be moved to the second erase position. As long as the mode is set, the rod 38 and the erasing actuating member 24 maintain the state shown in FIG.
The state in which the ribbon vibrator 18 can be moved from the rest position to the active position and the activation state of the escapement mechanism are maintained. Therefore, the carriage is moved step by step in the character feeding direction by the operation of the escapement mechanism in conjunction with the printing operation,
Erroneously printed characters can be erased continuously.

If the correction key 37 is pressed down by mistake during the erasing operation of continuous characters, the bent portion 37a will not come into contact with the engaging portion 38a of the rod 38, so the erasing operation will not be affected in any way.

When the switching member 40, which has completed the erasing operation, is switched to the setting position of the single character erasing state, the rod 38 returns to the original position shown in FIG.
4 is rotated back by the urging force of the tension spring 25, and its one side arm portion 26 engages with one arm 18a of the ribbon vibrator 18, and the cam follower 21 is separated from the cam 20.

In addition, due to the return rotation of the erasing actuating member 24,
The engagement piece 28 is connected to the cam portion 32 of the lock link 32.
c, and the engagement piece 28 moves to the fifth position.
By engaging the bent piece 30a in the state shown in the figure, the releaser 30 is rotated counterclockwise together with the engagement piece 28 from the state shown in FIG.
2 returns to the rest position shown in FIG. At the same time, the working arm 29 is disengaged from the pin 36a of the escape release link 36, and the escape release link 36 rotates back to its current position. Therefore, all the members return to their normal states as shown in FIG.

Note that the present invention is not limited to the above-mentioned embodiments. For example, if one correction key is provided as the erasing operation means, and the correction key is pressed one step, the first erasing mode is set, and when the correction key is pressed one step further, the first erasing mode is set. It is also possible to make arbitrary changes without departing from the spirit of the present invention, such as configuring the second erase mode to be set when the value is lowered.

〔Effect of the invention〕

As described in detail above, the present invention sets the first erasing mode when correcting one erroneous printing,
When an erase operation is performed based on pressing the corresponding character key, the erase mode is automatically canceled and reprinting can be performed immediately, and the second erase mode is set when correcting consecutive incorrect prints. The erasing mechanism and the moving mechanism are activated based on the pressing of the character key, the erasing operation and movement to the erasing position are performed, and the erasing mode is activated only when the next character key is pressed and the mode release means is activated. Release. Therefore, it is possible to set the erasure mode according to the situation of the misprinted characters that you want to erase, and even if you set the second mode by mistake, you can erase unnecessary characters by operating the mode release means. This has excellent effects such as eliminating the need for unnecessary erasing operations.

[Brief explanation of drawings]

Fig. 1 is a partially exploded perspective view showing the escapement mechanism, Fig. 2 is a perspective view showing the erasing operation means and main parts of the erasing mechanism, Fig. 3 is an enlarged front view also showing the erasing mechanism, and Fig. 4 and 5 The figure is also an enlarged front view showing the operating state of the erasing mechanism. 3...Printing head, 5...Ratchet wheel, 7...Holding claw body, 9...Feeding claw body (5, 7,
9 etc. constitute a moving mechanism), 14...
Second crank, 17... Pin, 18... Ribbon vibrator, 24... Erasing operating member, 29...
...Action arm, 32... Lock link (24, 32, etc. constitute an erasing mechanism), 37... Correction key, 40... Switching member.

Claims (1)

[Scope of Claims] 1. A printing mechanism that prints on a printing paper based on the pressing of a character key, and an erasing mechanism that erases the corresponding character on the printing paper using an erasing ribbon based on the pressing of a character key. , a moving mechanism capable of relatively moving the printing paper, a printing mechanism, and an erasing mechanism in conjunction with an erasing operation; a mode setting means for selectively setting a first erasing mode and a second erasing mode; and the second erasing. mode canceling means for canceling the mode; when setting the first erasing mode, canceling the first erasing mode after the erasing operation; and when setting the second erasing mode, actuating the moving mechanism in conjunction with the erasing operation. and maintain the second erase mode,
A typewriter with a manual erasure function, comprising: erasure control means for canceling the second erasure mode by activation of the mode release means. 2. The manual erasure according to claim 1, wherein the erasure control means operates the erasure mechanism when setting the first erasure mode and disables the operation of the moving mechanism after the erasure operation. Functional typewriter.