JPH0646704Y2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an erasing mechanism of a printing apparatus for correcting erroneous printing on printing paper with a correction ribbon.

[Prior Art] In the conventional electronic typewriter, when correcting the erroneous printing, when the carriage is moved to face the erroneous printing and the correction key is operated, the type of the type wheel is printed by the hammer through the correction ribbon. It is struck by erroneous printing on the paper. Next, the carriage moves slightly with the correction ribbon in the left-right direction with respect to the previous erroneous printing, and each time, the character erasing operation is performed twice more in the same manner as described above.

[Problems to be Solved by the Invention] As described above, at the time of correction, the character erasing operation is performed three times for one erroneous printing. In this case, however, the correction ribbon is not fed, so erroneous printing and printing paper are performed. The position of the correction ribbon that abuts on the position does not change during the three character erasing operations.

However, although the consumption of the correction ribbon is saved in such a case, there is a possibility that the erasing effect against erroneous printing may be reduced, unerased may occur, the paper surface may be soiled, and the appearance of the printed matter may be deteriorated.

[Object of the Invention] The present invention has been made in view of the above circumstances, and when correcting erroneous printing, the purpose of the invention is to eliminate erasure of erroneous printing while ensuring saving of the amount of consumption of the correction ribbon. It is an object of the present invention to provide an erasing mechanism for a printing apparatus, which has excellent effects such that the erasing effect is improved, the paper surface is prevented from becoming dirty, and the appearance of the printed matter is improved.

[Means for Solving Problems] According to the present invention, a carriage provided with a printing mechanism is reciprocally moved in the longitudinal direction of the platen, and a character is struck by a hammer from the back side of the platen on the platen via a printing ribbon. In a printing device that prints on a printing sheet and erases the incorrect printing by hitting the type with a hammer multiple times when correcting the incorrect printing, the correction ribbon is supported by the printing mechanism. A holder, which is independently swingably provided on the carriage, and whose correction ribbon is selectively arranged at a rest position where printing does not face erroneous printing and a printing position which faces erroneous printing; When hitting, the holder is swung from the rest position to the printing position where the center portion in the width direction of the correction ribbon faces erroneous printing, and the second and subsequent times. When hitting, the first position in the width direction of the correction ribbon, which is above the central portion of the correction ribbon, faces the erroneous printing on the printing paper, or below the center portion in the width direction of the correction ribbon. The unit is provided with an elevating mechanism for alternately minutely displacing the correction ribbon to a second position facing the erroneous printing on the printing paper.

[Operation] According to the present invention configured as described above, the correction ribbon is slightly displaced in the vertical direction with respect to the erroneous printing on the printing paper as the erroneous printing is corrected. Separately from the above, a slight vertical displacement is generated. As a result, the position of the correction ribbon that comes into contact with erroneous printing when the hammer is struck multiple times is slightly different from the center portion in the width direction of the correction ribbon, the upper portion or the lower portion of the correction ribbon each time the striking operation is performed. The erroneous printing will be erased by the unused portion of the correction ribbon without sending. Moreover, since the correction ribbon is displaced vertically, it does not affect the consumption amount of the correction ribbon.

[Embodiment] An embodiment in which the present invention is applied to an electronic typewriter will be described below with reference to the drawings.

Printing paper 1 is placed in a flat box-shaped casing (not shown).
A platen 2 that supports the platen 2 is rotatably provided, and a carriage 3 is reciprocally movable in the longitudinal direction of the platen 2. The carriage 3 is provided with a printing mechanism 7 including a hammer 4 driven by a solenoid (not shown) and a type wheel 6 having a type 5 formed on the outer peripheral edge. Further, a holder 8 is pivotally supported on the upper surface of the carriage 3 by a pin 9 so as to be vertically swingable.
A ribbon cassette 10 is attached to the. In the ribbon cassette 10, a take-up spool and a supply spool (both not shown) around which the print ribbon 11 is wound are provided, and the print ribbon 11 exposed from the ribbon cassette 10 is placed on the platen 2.
Facing the side.

Then, the holder 8 has guides 12, 12 as shown in FIG.
Semicircular support plates 13 and 14 are formed in a hanging state adjacent to, and support shafts 13a and 14a (not shown) are horizontally projected at the center of the support plates 13 and 14. A supply spool 15 and a take-up spool 16 are respectively supported by the support shafts 13a and 14a, and a correction ribbon 17 is hung from the supply spool 15 via the guide 12 to the take-up spool 16. The supply spool 15 is constantly urged to rotate in the counter supply direction by a mainspring (not shown) to give a proper tension to the correction ribbon 17 and prevent the correction ribbon 17 from sagging. This holder 8 is the first
From the rest position shown by the solid line in the figure to the printing position of the one-dot chain line (printing position of the printing ribbon 11) and the correction position of the two-dot chain line (printing position of the correction ribbon 17), the holder is selectively rocked. The spring 8 is constantly biased by a spring 18 toward the correction position. Therefore, between the support plate 14 and the take-up spool 16, the holder 8 sequentially sends the correction ribbon 17 for a predetermined length as the holder 8 swings from the correction position to the rest position. A well-known correction ribbon feeding mechanism 19 as shown in Kaisho 62-70957) is attached.

In the correction ribbon feeding mechanism 19, the rotary wheel 20 and the ratchet wheel 21 are individually attached to the support shaft 14a in a freely rotatable state, and the link arm 22 and the blocking arm 23 are radially extended to the rotary wheel 20. There is. A pin 24 is vertically attached to the tip of the link arm 22, and
The tip of 23 is bent in a dogleg shape and has a claw portion 23a that is constantly meshed with the teeth of the ratchet wheel 21. Meanwhile, ratchet car 2
Reference numeral 1 corresponds to an elongated stopper 25. One end 26 of the stopper 25 is attached to the holder 8, and the other end has a claw 27 that engages with the ratchet wheel 21. This allows the take-up spool 16 to rotate only in the direction in which the correction ribbon 17 is taken up, that is, in the direction of arrow A in FIG. The take-up spool 16 is connected to the ratchet wheel 21 via connecting teeth 16a. Further, one end of the swing rod 28 is rotatably supported by a stud 29 fixed to the carriage 3, the other end is pivotally supported by a pin 24 of the link arm 22, and an intermediate part thereof is held by the holder 8.
It is pivotally supported by a pin 31 on a link 30 depending from.

Now, the carriage 3 has a step motor capable of rotating in the forward and reverse directions.
32 is attached, its motor shaft 32a is oriented horizontally, and a pinion 33 is fitted therein, and the pinion 33 is meshed with a drive pinion 35 via a spur gear 34. The drive pinion 35 is rotatably supported on the carriage 3 by a support shaft 37 together with a disk-shaped ribbon lift cam 36 which constitutes the lifting mechanism of the present invention. As shown in FIG. 4, a spiral cam portion 38 is formed on one side of the ribbon lift cam 36. The cam portion 38 continuously forms a uniform diameter groove 39, a first cam groove 40 and a second cam groove 41. The uniform diameter groove 39 corresponds to the rest position of the print ribbon 11 and the correction ribbon 17 and is shown in FIG. As shown by the section between the position T and the position U, it has an arc shape with a circumferential angle θ0. The first cam groove 40 corresponds to the print position, has an angular interval of θ1 as shown by the section between the position U and the position V, and gradually increases in diameter as the angle in the direction of the position V increases. The second cam groove 41 corresponds to the corrected position, and as shown by the section between the position V and the position W, θ
It has an angular interval of 2 and gradually increases in diameter as the angle increases in the position W direction.

Further, the cam portion 38 is formed with a shift cam groove 42 continuously at the position W at the end of the second cam groove 41. The shift cam groove 42 includes a first shift portion 42a and a second shift portion 42b. The first shift portion 42a has a slight angular interval Δθ as shown in the section between the position W and the position X, the cam diameter gradually increases from the position W toward the position X, and the cam diameter dimension at the position X is It is set to be slightly larger than that at the position W. Further, the second shift portion 42b has an angular interval Δθ as shown in the section between the position X and the position Z, the cam diameter gradually decreases from the position X to the position Z, and the cam diameter dimension at the position Z is the position. It is set to be slightly smaller than that for X.

Therefore, the equal-diameter groove 39, the first cam groove 40, the second cam groove 41, and the first and second shift portions 42a and 42b of the cam portion 38 are moved by the rotation of the ribbon lift cam 36 as shown in FIGS. In the figure, there is a cam characteristic in which the vertical axis represents displacement (h) and the horizontal axis represents rotation angle (deg). Further, a crescent-shaped relief groove 43 is formed in the cam portion 38 from the shift cam groove 42 to the middle of the equal-diameter groove 39 on the outer periphery. An inclined bottom groove 44 and a shallow bottom groove 45 having a depth gradually decreasing from the clearance groove 43 toward the position V are formed so as to surround the first cam groove 40 from the middle of the equal-diameter groove 39. . Then, the shallow groove 45 and the first cam groove
The portion where 40 joins is a step 46.

On the other hand, on one side wall 8a of the holder 8, a connecting plate 47 having a U-shaped cross section, which is located between the guide 12 and the pin 9, is fixed by a pair of screws 48 as shown in FIGS. , The opposing hanging pieces 47a, 47b of the connecting plate 47 are the ribbon lift cams 36.
Are arranged so as to sandwich the upper end portion of the. The hanging piece portion 47a of the connecting plate 47 corresponds to the cam portion 38 and forms a support piece 49 protruding outward in an angle shape, and the other hanging piece portion 47b.
Forms an L-shaped hooking portion 50 extending downward.
In this state, a pin-shaped follower 51 is provided between the support piece 49 and the hanging piece portion 47a, one end thereof penetrates the hanging piece portion 47a, and the other end thereof penetrates the supporting piece 49, so that the ribbon lift cam 36 is provided. It is located in the cam portion 38. The follower 51 is displaced along the cam portion 38 as the ribbon lift cam 36 rotates in the direction of arrow K in FIG. In this case, the follower 51 has the first and second shift portions 42.
When displaced along a and 42b, the holder 8 is slightly rocked up and down. The positions that the holder 8 occupies in the vertical direction with the correction position sandwiched by this slight swing are the first position and the second position as indicated by the one-dot and two-dot chain lines in FIG. 9, respectively. The follower 51 is a leaf spring 52.
Is constantly urged to come into contact with the bottom surface of the cam portion 38,
Normally, it is located at the position U in the equal-diameter groove 39.

On the other hand, the oscillating member 53 is arranged in the vicinity of the ribbon lift cam 36, and the oscillating member 53 integrally includes branch members 53a and 53b that branch upward from the base end portion as shown in FIG. It is formed, and the base end is rotatably supported on the carriage 3 by a pin 54. The branch elements 53a and 53b of the rocker 53 are located on the opposite side of the cam portion 38 of the ribbon lift cam 36, and pin-shaped C cam followers 55 and pivot pins 56 are provided at the respective tip ends of the branch elements 53a and 53b.
Are installed respectively. Also, ribbon lift cam
A stopper member 57 is rotatably provided on the support shaft 37 so as to overlap with the support shaft 36, a bent piece 57a that can be engaged with and disengaged from the hooking portion 50 of the connecting plate 47 is formed at one end, and a branch is provided at the other end. A long hole 57b into which the pivot pin 56 of the child 53b is inserted is provided. When the oscillating member 53 is at the position shown by the solid line in FIG. 2, the bending piece 57a is located in a state of facing the hooking portion 50 of the connecting plate 47 from above.

Further, as shown in FIG. 8, a cam groove portion 58 for receiving the C cam follower 55 of the rocker 53 therein is formed on the surface of the ribbon lift cam 36 opposite to the cam portion 38. The cam groove portion 58 is provided with an annular circulation groove 59 and an end-shaped annular groove 60 formed in a C shape around the outer periphery of the circulation groove 59 and arranged concentrically. The circulator groove 59 is disposed in the operating position as shown by the solid line in FIG. 2 in order to hold the holder 8 at the printing position during the printing operation, and the annular groove 60 is oscillated at the time of correction as shown by the dashed line in FIG. The armature 53 is arranged at the inoperative position where the holder 8 is released from the holding state. Further, in the cam groove portion 58, a first guide groove 61 and a second guide groove 62 are formed in opposite directions from the circulation groove 59 to the annular groove 60 so as to be substantially in contact with the circulation groove 59. The first guide groove 61 allows the C cam follower 55 to be introduced from the circulation groove 59 into the annular groove 60 as the ribbon lift cam 36 rotates in the direction opposite to the arrow K in FIG. 4 (in the direction of arrow J in FIG. 8). In the second guide groove 62, the C cam follower 55 can be introduced from the annular groove 60 into the circulation groove 59 as the ribbon lift cam 36 rotates in the arrow K direction. And C
The cam follower 55 is located at the standby position G near the first guide groove 61 in the circulation groove 59.

Next, the operation of the above configuration will be described according to the use of the electronic typewriter.

First, when a predetermined character key is pressed during printing, the step motor 32 is energized, and the ribbon lift cam 36 is moved in the direction of arrow K in FIG. 4 via the pinion 33, spur gear 34 and drive pinion 35. The follower 51 is displaced by an angle of θ1 and is displaced from the position U to the position V along the first cam groove 40.
Along with this, the holder 8 is pushed up via the connecting plate 47 and cooperates with the spring 18 to swing to the print position of the one-dot chain line in FIG. In this case, the C cam follower 5 of the branch 53b of the rocker 53
5 is displaced along the circulation groove 59 of the cam groove portion 58, and the hooking portion 50 of the connecting plate 47 engages the bent piece 57a of the stopper member 57 to hold the holder 8 at the previous printing position. In this state, the solenoid of the printing mechanism 7 is energized to hit the type 5 of the type wheel 6 by the hammer 4 to print on the printing paper 1 via the printing ribbon 11.

When the next character key is continuously operated within a predetermined elapsed time after the previous character key operation, the ribbon lift cam 36 is held in the state where the holder 8 is held at the print position for each operation of the character key. The step motor 32 rotates intermittently by a predetermined angle. Along with this, the C cam follower 55 has a cam groove
It is displaced so as to circulate along the circulation groove 59 of 58, and the hook 50
Are kept engaged with the bent pieces 57a. Therefore, the follower 51 circulates in a substantially circular shape along the inner peripheral surface of the clearance groove 43, the inclined bottom groove 44, the shallow bottom groove 45 and a part of the first cam groove 40 in order as shown by the broken line in FIG. Displace. At this time, if the next character key is not operated within a predetermined time after the continuous printing operation is completed, the position storage means (not shown) that stores the rotation angle position of the ribbon lift cam 36 is used. The step motor 32 is rotated so that the follower 51 can return to the position U of the equal-diameter groove 39 with minimum rotation. Therefore, the ribbon lift cam 36 is rotated in the arrow K direction or the counter arrow K direction, the follower 51 is displaced along each cam groove of the cam portion 38, and the holder 8 is returned to the original position U. Swing back to the rest position.

When the next character key is not operated within a predetermined time after the first character key is operated (during single-shot printing), the ribbon lift cam 36 is rotated in the direction of the counter arrow K by the angle of θ1 and the follower 51. Moves from the position V through the first cam groove 40 and returns to the initial position U. Therefore, the holder 8 swings back to the rest position against the spring 18.

Further, when correcting erroneous printing, first, the backspace key is operated to make the character wheel 6 correspond to erroneous printing on the printing paper 1. Next, when the correction key is operated, the stepper motor 32 causes the ribbon lift cam 36 to rotate in the opposite arrow K direction by an angle of θ3. Along with this, the C cam follower 55 present at the standby position G of the circulation groove 59 of the cam groove portion 58 is the first
It is displaced into the annular groove 60 via the guide groove 61. As a result, the oscillating member 53 oscillates around the pin 54 in the counterclockwise direction in FIG. 2 and occupies the position indicated by the chain double-dashed line from the position indicated by the solid line. Therefore, the stopper member 57 rotates clockwise about the support shaft 37, and the bent piece 57a
Becomes free to be disengaged from the hook portion 50.

In this state, the ribbon lift cam 36 is rotated by an angle of (θ3 + θ1 + θ2) in the direction of arrow K in FIG. 4, and the C cam follower 55 is displaced by an angle of (θ3 + θ1 + θ2) along the annular groove 60, while the follower 51 is moved. Equal diameter groove 39, first cam groove 40
And is displaced to the position W along the second cam groove 41. Therefore, the oscillating member 53 is held in the state of the chain double-dashed line in FIG. 2, the bending piece 57a is free from the engagement of the hook portion 50, and the holder 8 of the ribbon lift cam 36 is released. Rotation and spring 18
Is pushed up via the connecting plate 47 and swings to the correction position. In this state, the solenoid of the printing mechanism 7 has a
The energizing operation is repeated intermittently and quickly. With the first energization, the hammer 4 hits the type 5 on the type wheel 6,
Erroneous printing is removed through the correction ribbon 17 which is still at the correction position. Then, the step motor 32 and the solenoid are energized with the second energization, and the step motor 32 is rotated in the normal direction to move the ribbon lift cam 36 through the pinion 33, the spur gear 34, and the drive pinion 35 by an angle Δθ in the arrow K direction. It is rotated. Therefore, the follower 51 is displaced from the position W to the position X via the first shift portion 42a, the holder 8 is pushed up via the connecting plate 47, and the correction ribbon 17 is erroneous as shown by a chain line in FIG. The printing and printing wheel 6 occupies a first position slightly offset from the printing character 5 above the printing character 5.
As the holder 8 swings to the first position, the link 30 is slightly displaced by the correction ribbon feeding mechanism 19 in the direction of arrow H in FIG. 3, and the swing rod 28 moves in the direction of arrow B around the stud 29. It turns only a small amount. For this reason the link arm 22
Although the rotating wheel 20 slightly rotates in the direction opposite to the arrow A direction via the lever, the ratchet wheel 21 is prevented from rotating by the stopper 25 because the claw portion 23a of the blocking arm 23 only slides on the teeth of the ratchet wheel 21. It is kept as it is. In this state, the type wheel 6 is set by the hammer 4 in the same manner as at the beginning.
The character 5 is struck and the erroneous printing is removed by the unused portion of the correction ribbon 17 shown by the broken line in FIG.

Further, the step motor 32 is energized at the same time as the solenoid of the printing mechanism 7 is energized for the third time.
Rotates further in the positive direction. This allows the ribbon lift cam
36 rotates in the direction of arrow K by an angle of Δθ, and the follower 51 is displaced from position X to position Z via the second shift portion 42b. Along with this, the holder 8 is pulled down via the connecting plate 47, and the correction ribbon 17 is misprinted as shown by the chain double-dashed line in FIG. Occupy As the holder 8 swings to the second position, the correction ribbon feeding mechanism 19 causes the link 30 to move in the opposite arrow H direction.
The oscillating rod 28 slightly rotates in the direction opposite to the arrow B around the stud 29 by a slight displacement in the direction. Accordingly, the rotating wheel 20 slightly rotates in the arrow A direction via the link arm 22, so that the ratchet wheel 21 rotates in the same direction by the claw portion 23a of the blocking arm 23 by an amount smaller than the inter-tooth pitch size. Move. Further, the claw 27 of the stopper 25 is located on the tooth in a state of being slightly separated from the tooth end portion of the ratchet wheel 21. The rotation power of this ratchet wheel 21 is the take-up spool 1 via the connecting teeth 16a.
6 and the take-up spool 16 rotates in the direction of arrow A by a small amount. Therefore, the correction ribbon 17 is supplied from the supply spool 15 by a minute length and slightly moved to the right, that is, in the direction of arrow N in FIG. In this state, the hammer 5 hits the type 5 on the type wheel 6 and the correction ribbon 17
Erroneous printing is eliminated by the unused part shown by the one-dot chain line in Fig. 10.

After the correction of such erroneous printing is completed, the stepping motor 32 causes the ribbon lift cam 36 to move in the opposite arrow K direction (θ1 + θ2 +
2Δθ), the follower 51 moves from the position Z to the first position,
Second shift portions 42a, 42b, second cam groove 41 and first cam groove 40
After returning to the position U, the holder 8 swings downward against the spring 18 and returns from the correction position to the rest position. In this case, the holder 8 swings from the second position to the first position while the follower 51 moves from the position Z to the position X along the second shift portion 42b. Therefore, the rotating wheel 20 slightly rotates in the direction opposite to the arrow A as when the holder 8 swings from the position W to the position X, and the claw portion 23a of the blocking arm 23 slightly moves on the teeth of the ratchet wheel 21. Separate from the tooth end. At this time, supply spool
Correction ribbon because 15 is urged to rotate in the anti-feed direction
The ratchet wheel 21 is slightly rotated in the direction opposite to the arrow A direction via the 17 and the take-up spool 16, and the pawl 27 of the stopper 25 is moved to the ratchet wheel.
Abut the tooth end of 21. On the other hand, the C cam follower 55 returns from the annular groove 60 to the circulation groove 59 via the second guide groove 62 and returns to the original standby position G. Then, in the process in which the C cam follower 55 passes through the second guide groove 62, the oscillating element 53 oscillates from the alternate long and short dash line in FIG. 2 to the solid line position via the branch element 53a. The rocking force of the rocker 53 is transmitted to the stopper member 57 via the pin 54, the stopper member 57 rotates from the position of the one-dot chain line to the position of the original two-dot chain line, and the bending piece 57a becomes the connecting plate 47. Hook 50
Is placed in an initial position in which it can be engaged with.

On the other hand, as the holder 8 first swings from the rest position to the correction position, in the correction ribbon feeding mechanism 19, the link 30 is displaced in the direction of arrow H in FIG. And rotate in the direction of arrow B. Therefore, the rotating wheel 20 rotates in the direction opposite to the arrow A direction via the link arm 22, but the claw portion 23a of the blocking arm 23 slips on the teeth of the ratchet wheel 21, and the ratchet wheel 21 is rotated by the stopper 25. It is kept forbidden. Therefore, the take-up spool 16 does not rotate and the correction ribbon 17 is not taken up. On the contrary, when the holder 8 swings back from the correction position to the rest position, the link 30 is displaced in the counter arrow H direction, and the swing rod 28 is rotated about the stud 29 in the counter arrow B direction.
As a result, the rotating wheel 20 rotates in the direction of arrow A via the link arm 22, and the pawl portion 23a of the blocking arm 23 causes the ratchet wheel 2 to rotate.
1 rotates in the same direction. The turning force of the ratchet wheel 21 is transmitted to the take-up spool 16 via the connecting teeth 16a, and the take-up spool 16 rotates in the direction of arrow A to take up the correction ribbon 17 from the supply spool 15 by a predetermined length.

According to the above configuration, when the erroneous printing is corrected, the correction ribbon 17
Erroneous printing is erased by the correction ribbon 17
Is slightly moved up and down with respect to the printing paper 1, so that in the second and third erasing operations, the correction ribbon 17 is slightly misaligned vertically from the first position and the second position. Occupies the position, and the erroneous printing is removed by the unused portion of the correction ribbon 17. Therefore, unlike the conventional case in which erroneous printing is removed by the same portion of the correction ribbon through the three erasing operations, the erasing effect is greatly improved, there is no unerased residue, and stains on the paper surface are prevented. Can be created. Moreover, since the correction ribbon 17 is displaced in the vertical direction, the correction ribbon 17 is not excessively consumed, which contributes to the saving of the correction ribbon 17.

In the above embodiment, the correction ribbon 17 is moved in the direction of the arrow N at the third time when the erroneous printing is corrected. However, in addition to this, the correction ribbon is moved in the direction opposite to the arrow N at the time of the second correction.
It may be configured to move in the direction. In addition, the number of corrections by the correction ribbon 17 is not limited to three, and for example, a plurality of shift cam grooves may be formed in the outer peripheral edge of the escape groove 43, and the follower 51 may correct these errors when correcting erroneous printing. It may be configured to be displaced along the shift cam groove. In this case, the distance dimension between the first position and the second position is made different for each shift cam groove, and the vertical width dimension of the correction ribbon is set to be large so that the unused portion of the correction ribbon is corrected each time the correction operation is performed. The erroneous printing may be erased by.

Further, the holder may be separately provided with an extremely small electric motor capable of rotating in the forward and reverse directions, and the correction ribbon may be moved by the electric motor during the correction operation in the left-right direction, that is, the arrow N and the opposite arrow N direction. Is. In addition, in concrete implementation, various modifications can be made without departing from the gist of the invention.

[Advantage of Device] As described above, according to the present invention, when erroneous printing is corrected, the consumption of the correction ribbon is saved and the unerased portion due to the erroneous printing is eliminated. It is possible to provide a practically excellent erasing mechanism for a printing device, which prevents the stains from being generated and, in turn, improves the appearance of the printed matter.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a vertical cross-sectional view of a main part, FIG. 2 is a vertical cross-sectional view at a position different from FIG. 1, and FIG.
The figure is a front view of the correction ribbon feeding mechanism, FIG. 4 is a front view of the cam portion of the ribbon lift cam, FIGS. 5 and 6 are characteristic diagrams of the cam portion of the ribbon lift cam, and FIG. 7 is the upper surface of the connecting plate. FIGS. 8 and 9 are front views of the cam grooves in the ribbon lift cam, FIG. 9 is a detailed view for explaining the operation, and FIG. 10 is an enlarged front view of the correction ribbon when erroneous printing is corrected. In the figure 1 ... Printing paper, 2 ... Platen, 3 ... Carriage, 7 ... Printing mechanism, 8 ... Holder, 11 ... Printing ribbon, 17 ... Correction ribbon, 32 ... Step motor (driving motor) , 36 …… Ribbon lift cam (elevating mechanism), 38…
... Cam section, 42 ... shift cam groove section, 42a, 42b ... first and second shift sections, 51 ... follower

Claims (2)

[Scope of utility model registration request] 1. A carriage provided with a printing mechanism is reciprocally moved in the longitudinal direction of a platen, and a character is struck from the backside by a hammer to print on a printing paper on the platen via a printing ribbon, and at the same time, an error is caused. When correcting printing, in a printing device that erases erroneous printing by striking the type with a hammer multiple times with the correction ribbon facing each other, the correction ribbon is supported and shaken on the carriage independently of the printing mechanism. A holder which is movably provided and is selectively arranged at a rest position where the correction ribbon does not face erroneous printing and a printing position which faces erroneous printing; and the holder when the first striking is made at the time of correction. Is oscillated from the rest position to a printing position where the central portion in the width direction of the correction ribbon faces erroneous printing, and the correction correction is performed at the second and subsequent impacts. The first position in the width direction of the correction ribbon facing the erroneous printing on the print sheet, or the erroneous printing on the correction paper in the width direction of the correction ribbon below the center portion. And an elevating mechanism for alternately finely displacing the correction ribbon to a second position opposed to the printing device. 2. The lifting mechanism comprises a ribbon lift cam having a cam portion and rotated by a drive motor, and a follower provided between the cam portion and the holder. The printing device according to claim 1 of the utility model registration claim.