JPS62270371A - Typewriter with manual erasing mechanism - Google Patents

Abstract

PURPOSE:To enhance operability when a printed character is erroneous, by a method wherein an erasing mechanism is operated so as to follow one push- down operation of a character key at the setting time of a single erasure mode and the erasing mechanism is operated repeatedly at the setting time of a continuous erasure mode and a moving mechanism is operated. CONSTITUTION:When only one character is printed eroneously, a change-over member 40 sets a single erasure mode and, when printing operation is performed by an erroneously printed character key, a cam 20 is revolved and a ribbon vibrator 18 rises to an acting position to erase the character by an erasing ribbon CR. At this time, an escaping pin 17 is detached from the second crank 14 of an escapement mechanism to make said mechanism ineffective and printing paper is not stepped to a character feed direction. When a large number of characters are erroneously printed continuously, the change-over member 40 is set to a rearward continuous erasure mode and, when printing operation is performed corresponding to the erroneously printed characters, the characters are erased and, because a link 36 is detached from the escaping pin 17, the escapement mechanism is in an effective state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a typewriter with a manual erasing mechanism for erasing characters on printing paper by pressing a character key.

[Prior Art] Conventionally, in this type of typewriter, when manually correcting an erroneously printed character, the print head is faced to the erroneously printed character, and after operating a correction key, the character corresponding to the erroneously printed character is corrected. Press the key.

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 via the correction ribbon to erase the character.
The correction ribbon was returned to its original position.

[Problems to be Solved by the Invention] However, when erasing consecutive erroneously printed characters, after performing the above operation, the print head is moved to face the next erroneously printed character, and the same procedure as above is performed. It was necessary to perform the erasing operation according to the operating procedure, which made the operation very cumbersome.

[Purpose of the Invention] The present invention was made to solve the above-mentioned problems, and provides 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. The purpose is to provide

[Means for Solving the Problems] In order to achieve the above object, the present invention uses a printing mechanism that prints on a printing paper based on pressing a character key, and an erasing ribbon to print on the printing paper. an erasing mechanism for erasing predetermined characters; a moving mechanism for relatively moving the printing paper and the printing mechanism in conjunction with the erasing operation; a selection means for selecting and setting a single erasing mode and a continuous erasing mode; When the erase mode is set, the erase mechanism is actuated by following the press of only one character key, and after the erase operation, the erase mode is canceled, and when the continuous erase mode is set, all subsequent characters are activated. The gist of the typewriter is that the typewriter is characterized by an erasing control means that repeatedly operates the erasing mechanism in accordance with the depression of a key and operates the mobile vJR mechanism in conjunction with each erasing operation.

[Operation] In the typewriter with a manual erasing mechanism according to the present invention, when a character key is pressed, the printing mechanism prints on the printing paper. Further, when erasing an erroneously printed character, a single erasing mode or a continuous erasing mode is appropriately set by the selection means depending on the situation of the erroneously printed character.

Then, when the erase control means sets the single erase mode,
The erasing mechanism is activated following the subsequent depression of only one character key, and after the erasing operation, the car-erase mode is canceled. Furthermore, when the continuous erasing mode is set, the erasing mechanism is repeatedly operated following the subsequent presses of all character keys, and the moving mechanism is operated in conjunction with each erasing operation.

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

Next, an explanation will be given of the escapement mechanism for moving the sharp edge stepwise in the character feeding direction based on the printing operation.
has a rack plate (not shown) attached to the carriage.
A pinion (not shown) that meshes with the carriage is fixed, and a ratchet wheel 5 for moving the carriage at a predetermined pitch is fixed on the same axis, and an appropriate biasing means (
Based on the biasing force applied to the sharp edge in the character feeding direction by the blade (not shown), the blade is rotated (JIF') 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 behind the ratchet wheel 5, and one of the arm portions 7a has the ratchet A claw portion 8 that engages with the wheel 5 is formed, and the other arm portion 7b extends toward the opposite side from the one arm portion 7a.

A tri-arm-shaped feed claw body 9 is supported on the support shaft 6 so as to rotate 1q on the same axis as the holding claw body 7, and the first arm portion 9a and one arm portion 7a of the holding claw body 7 A tension spring 10 is hung between the first arm portion 9 and the first arm portion 9.
a is provided with a claw portion 11, and the ratchet wheel 5
The ratchet wheel 5 is engaged with the ratchet wheel 5 at a position opposite to the pawl portion 8 with the ratchet wheel 5 interposed therebetween.

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 a stationary 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 connected to one of the first cranks 3 rotatably supported on the left side of the support shaft 6 on an axis extending parallel to the support shaft 6. The first crank 13 rotates clockwise as the first crank 13 rotates.

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

Therefore, when the support base 2 is rotated counterclockwise and a printing operation is performed, the movement of the escape bin 17 causes the claws 7 and 9 to move through the first and second cranks 13 and 14. are integrally rotated in the clockwise direction, and both claw portions 8,
11 with respect to the ratchet wheel 5 is switched, the carriage is moved by half a pitch in the character feeding direction, and then, as the support base 2 is rotated back, both claws 7 are moved.
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 advances one pitch in the character feeding direction for each printing operation of the print head 3. It is moved so that the print position on the print paper is updated. 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 is a pair of arms 18a extending on both sides of the print head 3 so as to sandwich the print head 3 therebetween.

18b and a connecting rod that connects both arms 18a and 18b.
A ribbon vibrator 18 consisting of a ribbon vibrator 18c is rotatably supported and is capable of holding an erasing ribbon CR at the upper ends of both arms 18a and 18b, and a tension spring provided at the lower end of one arm 18a. 19 to rotate clockwise.

A cam follower 21 that can be engaged with a cam 2Q that rotates when all character keys (not shown) are pressed is protruded from the lower side surface of one arm 18a.
Two engaging pins 22 and 23 are provided protruding from the upper side surface.

Below the ribbon vibrator 18, on an axis extending parallel to its rotational axis, an erasing actuation member 24 having a roughly inverted U-shape on the front is rotatably supported, and an arc-shaped notch is provided at the lower end of the erasing actuation member 24. 24a is formed and is urged to rotate counterclockwise by a tension spring 25, so that the tip of the minus side arm portion 26 is releasably 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 that extends on the opposite side of the negative side arm part 26, and an operating arm 29 protrudes downward from the center of the other side arm part 27. It is already formed.

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 is connected to the engagement piece 28 of the erasing actuating member 24.
The rotation range is regulated by a stopper 31 fixed to the machine frame as shown in FIG. 5.

A lock link 32 is rotatably disposed between the ribbon vibrator 18 and the erasing actuating member 24, and is biased to rotate clockwise by a tension spring 33 suspended between the ribbon vibrator 18 and the releaser 30. The upper end cam surface 32a can be engaged with one engagement pin 22 of the ribbon vibrator 18σ. At the lower end of this lock link 32, there is a locking stepped portion 32b and an arc-shaped cam portion 32G that continues above the locking step portion 32b.
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 engaging piece 28 of the erasing actuating member 24 is always engaged with the lower side of the lock link 32. It is designed to match.

A crank 34 for escape release 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 connected to the ribbon vibrator. It engages with the other engagement pin 23 of the ribbon vibrator 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. Also, 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. It is designed to engage.

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 3B 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, there is provided a button of the present invention for selectively setting one of a single character erasing state (single erasing mode) and a continuous character erasing state (continuous erasing mode). A switching member 40, which is a selection means, is rotatably supported and has a pin 40a protruding from the tip of its arm. The switching member 40 is maintained in the two switching states for one night 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 its upper end groove 42a, and the rod 38 bends into its lower end protrusion 42b. The portion 38b is adapted to engage.

Therefore, when erasing a single character, after manually operating the switching member 40 to set the front single character erasing state (single erasing mode) shown in FIG. 2, press and operate the correction key 37. The bent portion 37a is the engaging portion 3 of the rod 38.
8a, 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 suppression. In addition, 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 (continuous erasing mode). The actuation link 42 rotates following the rotation of the member 40, and the rod 38 is moved rearward by a predetermined amount due to the engagement between the actuation link 42 and the rod 38.

Furthermore, since the movement m of the rod 38 is set to be larger when erasing continuous characters than when erasing single characters, when the continuous erasing mode is set, the space S is expanded and when erasing single characters. Even if the correction key 37 is pressed, the bent portion 37a 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. When the switching member 40 is set to the single erasure mode as shown in the figure, and the correction key 37 is pressed down, the rod 38
With this movement, the erasing actuating member 24 is rotated clockwise from the rest position shown in FIG. 3 to the first moving position shown in FIG. It engages with the locking step portion 32b of the link 32 and becomes locked.

At this time, the releaser 30 and the lock link 32 are maintained in an engaged state.

Also, by rotating the erasing actuating member 24, the one arm portion 2
6 is disengaged from the lower end of one arm 18a of the ribbon vibrator 18, and the ribbon vibrator 18 is rotated clockwise from the state shown in FIG. When engaged, the ribbon vibrator 18 is set to be movable 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. Characters are erased by the erasing ribbon CR supported at its tip. 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 34a, and the escape release link 36's engagement with the protruding piece 34c of the crank 34, the link 36 is rotated integrally with the crank 34, and the escape pin 17 that is in contact with the side surface of the link 36 is rotated by the biasing 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 8 is moved back to the rest position, the lock link 32 is reversed by the engagement between the engagement pin 22 and the cam 32a of the lock link 32. The lock link 32 and the erasing operating member 24 are rotated clockwise to disengage the engagement piece 28 of the erasing operating member 24, and the lock link 32 and the erasing operating member 24 are at rest as shown in FIG. Return to their respective positions. 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 with the ink ribbon accompanied by a stepping operation is performed.

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 incorrect characters were printed in a row. After that, when the switching member 40'f is set to the backward continuous erasing mode, the erasing actuating member 24 changes from the rest position shown in FIG. 3 to the first moving position shown in FIG. 4 as the rod 38 moves. Beyond that, the second section shown in Figure 5
It is rotated greatly to the moving position. Due to its 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 to fold the lower end of the lock link 32 and the releaser 3Q. The engagement with the curved piece 30a is released. As a result, the releaser 30 is rotated clockwise by the action of the tension spring 33, and the bent piece 30a of the releaser 30 engages with the lower side of the lock link 32, as shown in FIG. Rotation of the releaser 30 is restricted by the stopper 31 in the matching position.

Furthermore, similarly to the single erasing mode, the erasing actuating member 2
4, the engagement between the one side arm portion 26 and one arm 18a of the ribbon vibrator 18 is released.
The ribbon vibrator 18 is set to be movable from the rest position to the operating position. Roughly, as the erasing operating 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, if a printing operation is performed by depressing a character key corresponding to a large number of characters that have been printed incorrectly in succession in this state, the ribbon vibrator 18 will operate from the rest position following the rotation of the cam 20. The character is raised to the position and the character is 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 counterclockwise in FIG. 17, the pin 17 is not moved and the escapement mechanism is in an enabled state.

Also, as the ribbon vibrator 18 descends, the engagement bin 2
2 and the cam surface 32a, even if the lock link 32 is rotated counterclockwise from the state shown in FIG. 5, as long as the switching member 40 is set to the continuous erasure mode, the rod 3
8 and the erasing actuating member 24 maintain the state shown in FIG. 5, the state in which the ribbon vibrator 18 can be moved from the rest position to the operating position and the enabled state of the escapement mechanism are maintained. Therefore, in conjunction with the printing operation, the carriage is moved step by step in the character feeding direction by the operation of the escapement mechanism, and erroneously printed characters can be continuously erased.

Incidentally, if the correction key 37 is pressed down by mistake during the erasing operation of continuous characters, the bent portion 37a does not come into contact with the engaging portion 38a of the rod 38, so there is no effect on the erasing operation.

When the switching member 40 is switched to the setting position of the single character erasing state after the erasing operation is completed, the rod 38 returns to the original position shown in FIG.
The − side arm portion 26 is rotated back by the urging force of
is engaged with one arm 18a of the ribbon vibrator 18, and the cam follower 21 is separated from the cam 20 1B26.

Further, due to the return rotation of the erasing actuating member 24, the engaging piece 2B is disengaged from the cam portion 32C of the lock link 32, and the engaging piece 28 is engaged with the bent piece 30a in the state shown in FIG. By this, the releaser 30 and the engagement piece 28 are rotated counterclockwise from the state shown in FIG. 5, and the lock l link 32 is returned to the rest position shown in FIG. 3.

At the same time, the action arm 29 and the escape release link 36
is disengaged from the pin 36a, 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-described embodiment; for example, one correction key is provided as an operation means for erasing, and when the correction key is pressed down one step, the single-measurement mode is set, and It is also possible to make arbitrary changes without departing from the spirit of the invention, such as configuring the continuous erasing mode to be set when the button is depressed step by step.

[Effects of the Invention] As detailed above, the present invention provides a selection means that can be used both in cases where only one character is erroneously printed and in cases where a large number of characters are erroneously printed in succession. The single erasing mode and the continuous erasing mode can be easily set at 22 times, and the erasing mechanism operates reliably based on the pressing operation of a predetermined character key to erase each erroneously printed character. be effective.

[Brief explanation of the drawing]

Figure 1 is a partially exploded perspective view showing the front escapement groove;
2 is a perspective view showing the main parts of the erasing operation means and the erasing mechanism; FIG. 3 is an enlarged front view also showing the erasing mechanism;
FIG. 5 is an enlarged front view showing the operating state of the erasing mechanism.

Claims (1)

[Scope of Claims] 1. A printing mechanism that prints on printing paper based on the press of a character key, an erasing mechanism that erases a predetermined character on the printing paper using an erasing ribbon, and interlocked with the erasing operation. a moving mechanism for relatively moving the printing paper and the printing mechanism; a selection means for selecting and setting a single erase mode and a continuous erase mode; and a selection means for selecting and setting a single erase mode and a continuous erase mode; Activating the erasing mechanism following the press, and canceling the single erase mode after the erase operation, and repeatedly operating the erase mechanism following the subsequent presses of all character keys when the continuous erase mode is set. A typewriter with a manual erasing mechanism, comprising: erasing control means for operating the moving mechanism in conjunction with each erasing operation. 2. When setting the single erase mode, the erase control means:
2. A typewriter with a manual erasing mechanism according to claim 1, wherein said erasing mechanism is operated and said moving mechanism is disabled. 3. The erasing mechanism has an erasing actuating member that is always held in an inoperative position, and when the single erasing mode is set, the erasing operating member is temporarily moved from the inactive position to the first operating position. , and when the continuous erasing mode is set, the ribbon vibrator is moved and held from the inoperative position to the second moving position, and the movement of the ribbon vibrator to the operating position is controlled according to the moving position of the erasing actuating member. The typewriter with a manual erasing mechanism as described in item 2.