JPH046927Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Background of the Invention] The present invention relates to a printer such as a daisy-type printer, and particularly relates to a printer equipped with a print correction mechanism.

[Example of idea]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the carriage with the cassette removed.

The carriage 1 is intermittently fed at a predetermined pitch by the guidance of a guide member 2 and the driving force of a carriage transfer mechanism (not shown).
In front of the carriage 1, a platen 4 on which printing paper 3 is wound is arranged substantially parallel to the transport direction of the carriage 1.

Next, various mechanisms mounted on the carriage 1 will be explained. A pulse motor 6 for rotationally driving the daisy wheel 5 is installed approximately at the center of the carriage 1. An electromagnetic solenoid 7 is provided on the right side of the pulse motor 6 when viewed from the drawing.
By energizing this, the hammer 8 is rotated by a predetermined angle toward the daisy wheel 5 side. A ribbon drive mechanism 9, which will be described later, is provided on the left side of the pulse motor 6 when viewed in the drawing. In front of the pulse motor 6, a daisy wheel 5 as shown in FIG. 4 is arranged obliquely at an inclination angle of about 45 degrees, and a part of its periphery is connected to the platen 4 as shown in FIG. They face each other at a predetermined interval.

A ribbon cassette 10 is detachably attached above the carriage 1. As shown in FIG. 3, the ribbon cassette 10 has a print ribbon supply reel 11 and a print ribbon take-up reel 12 rotatably disposed inside it. A collection ribbon supply reel 14 is connected to the lower surface (the upper side in FIG. 3) of the ribbon cassette 10 via a reel support member 13, and a reel support member 15 is connected thereto at a predetermined interval. Collection ribbon take-up reels 16 are arranged rotatably. The front surface of the ribbon cassette 10 is provided with an inclined guide section 17 in which two shallow guide grooves are formed in parallel at an angle of about 45 degrees.
Note that a recessed notch 18 is formed in the intermediate portion of the inclined guide portion 17 to allow the hammer 8 to rotate.

The printing ribbon 19 with carbon attached thereto is let out from the printing ribbon supply reel 11, guided by the inclined guide part 17 toward the daisy wheel 5, and
The printing ribbon is sequentially wound onto the printing ribbon take-up reel 12. Also, collect ribbon 2 made of adhesive ribbon
0 is unwound from the collection ribbon supply reel 14, guided to the daisy wheel 5 side like the print ribbon 19, and sequentially wound onto the collection ribbon take-up reel 16. The printing ribbon 19 and the collection ribbon 20 are arranged in parallel on the inclined guide portion 17, and the printing ribbon 19 is arranged in the front.

By attaching the ribbon cassette 10 to the carriage 1, the printing ribbon 19 is inserted as shown in FIG.
and a collection ribbon 20 are arranged between the platen 4 and the daisy wheel 5.

FIG. 4 is a plan view of the daisy wheel 5. Many spokes 43 from the center to the outer circumference
extend radially, with one short spoke 43
With the exception of a, there are various type parts 21 at their ends.
is formed. At the end of the short spoke 43a, there is a collect character 2 for correcting the print.
2 is formed.

As shown in FIG. 2, the printing ribbon 19 is opposed to the type section 21 of the daisy wheel 5, and the pulse motor 6 is rotated by a predetermined angle based on a type selection signal from a control section (not shown). ,
The selected type portion 21 is stopped facing the hammer 8. Next, by momentarily energizing the electromagnetic solenoid 7, the hammer 8 is rotated in the direction of the arrow, and the printing section 21 is moved along with the printing ribbon 19 onto the paper 3.
It is designed to print the desired character by pressing it against the surface.

Next, the ribbon feeding mechanism will be explained. This mechanism can be divided into a ribbon drive mechanism 9 mounted on the carriage 1 and a ribbon cassette 10. First, the ribbon drive mechanism 9 will be explained.

At a predetermined position of the carriage 1, there is a direct current motor 2 capable of forward and reverse rotation, as shown in FIGS. 5 and 7, for example.
3 is fixed, a driving side belt gear 24 is attached to its rotating shaft, and a reflecting plate 25 made of a disc is fixed to the upper part of the belt gear 24. As shown in FIG. 5, the reflecting plate 25 has a large number of slits 26 radially formed at predetermined intervals along the circumferential direction. Below the reflector 25,
A rotation angle detection section 27 including a light emitting element and a light receiving element as a pair is installed (see FIG. 7).

A driven side belt gear 28 is provided at a predetermined interval from the driving side belt gear 24, and both gears 2
An endless belt 29 is stretched between the 4 and 28 sides.

A gear 30 is integrally provided on the upper part of the driven belt gear 28, and the upper end of a fixed shaft 31 that rotatably supports the driven belt gear 28 protrudes from the gear 30, and the base of the rotating arm 31 is attached to this protrusion. It is rotatably supported. A stud 32 is provided vertically at the free end of the rotating arm 31, an idler 33 is supported on the stud 32, and a leaf spring 34 is inserted between the idler 33 and the rotating arm 31.
The leaf spring 34 is in elastic contact with the upper surface of the idler 33. The idler 33 has a small diameter gear part 35 on the upper side,
It has a large diameter gear part 36 on the lower side, and the large diameter gear part 3
6 is always meshed with the gear 30 of the driven side belt gear 28.

A first gear 37 for printing ribbon is arranged near the driven belt gear 28 at a predetermined interval, and also has a small diameter gear part 38 on the upper side and a large diameter gear part 39 on the lower side. A first collect ribbon gear 40 and a second collect ribbon gear 41 are arranged at an intermediate position between the driven side belt gear 28 and the reflector 25, and both gears 40 and 41 are always in mesh with each other. The first gear 40 for the collection ribbon and the first gear 37 for the printing ribbon are separated, and the idler 3
3 are movably arranged. The outer peripheral portion of the second gear 41 for the collection ribbon partially protrudes outward from the side plate 42 of the carriage 1, as shown in FIG. 1, in order to mesh with a crown gear 59, which will be described later. The ribbon drive mechanism 9 has the structure described above.

Next, the ribbon cassette 10 will be explained in detail. As shown in FIG. 3, there are positioning holes 44 on both sides of the ribbon cassette 10, positioning claws 45 on both sides of the rear part, and slightly in front of the positioning claws 45, that is, the reels 14 and 15 are held. A chevron-shaped positioning abutment portion 62 is formed in the vicinity of each of them. The aforementioned printing ribbon take-up reel 1
A second printing ribbon gear 46 protruding downward is provided near 2. The rotation shaft 47 of this second gear 46 for printing ribbon is tightly fitted into the center hole of a ratchet gear 48 shown in FIG.

FIG. 9 is a partial plan view of the ribbon cassette 10 with the case removed. In the same figure, a rotary plate 49 is provided below the ratchet gear 48 and rotates integrally with the ratchet gear 48, and the outer periphery of the rotary plate 49 is connected to the printing ribbon wound body 5.
It has an uneven shape to prevent slipping with zero. The print ribbon take-up reel 12 is supported on the free end of an arm 51, and the arm 51 is urged by a spring 52 in a direction in which the print ribbon roll 50 comes into elastic contact with the rotating body 49. Reference numeral 53 denotes a reversal prevention member for the ratchet gear 48, which is made of elastic synthetic resin.

FIG. 10 shows the collection ribbon supply reel 14.
2 is a side view of the reel support member 13 supporting the reel support member 13. As shown in this figure, unevenness 54 is formed along the circumferential direction on the side surface of the reel 14, and the free end of the helical spring 55 supported by the reel support member 13 enters the recessed part of the unevenness 54. A predetermined back tension is applied to the collection ribbon 20.

FIG. 11 is a partial sectional view showing the state in which this reel support member 13 is attached to the ribbon cassette 10. An L-shaped locking portion 56 and an elastic locking claw 57 are provided on the upper part of the reel support member 13, and by locking these to hook-shaped mounting portions 58 formed on the ribbon cassette 10, A reel support member 13 is removably attached to the ribbon cassette 10. This mounting structure is the same on the reel support member 15 side that supports the collection ribbon take-up reel 16. As shown in FIG. 3, a crown gear 59 is integrally formed on the inner side surface of the collection ribbon take-up reel 16. Although not shown, a ratchet mechanism is provided between the collection ribbon take-up reel 16 and the reel support member 15, and the reel 16
can only rotate in the ribbon winding direction.

Next, ribbon cassette 10 for carriage 1
The positioning will be explained with reference to FIGS. 12 and 13. Ribbon cassette 10 as mentioned above
Positioning holes 44 are provided on both sides of the front part, and positioning holes 45 are provided on both sides of the rear part. On the other hand, at the front of the side plate 42 of the carriage 1, there is a chevron-shaped positioning protrusion 60 that protrudes upward.
However, on the other hand, claw hooks 61 (see FIG. 1) that protrude toward both left and right sides are provided at the rear.

When attaching the ribbon cassette 10 to the carriage 1, the ribbon cassette 10 is lowered onto the carriage 1 in an inclined state so that the front part is slightly downward, and is first guided forward by the inclined guide part 17. The printing ribbon 19 and the collection ribbon 20 are also brought to the front side of the daisy wheel 5. By lowering the rear part of the ribbon cassette 10 onto the carriage 1, the positioning protrusion 60 enters the positioning hole 44, and finally the positioning pawl 45 rides over the pawl hook 61 and comes into elastic engagement with it. As shown in FIG. 13, the ends of the positioning abutment portions 62 (see FIG. 3) on both sides protruding from the ribbon cassette 10 abut against the outer surface of the side plate 42 of the carriage 1, respectively. When the ribbon cassette 10 is installed in the carriage 1 in this manner, the longitudinal positioning of the ribbon cassette 10 is performed by using the opening edge of the positioning hole 44 and the positioning protrusion 60.
engagement with the positioning pawl 45 and the pawl hook 61
This is done by engaging with. Further, the ribbon cassette 10 is positioned in the left-right direction by the positioning abutting portions 62 abutting against the side plates 42 of the carriage 1, respectively.

In addition, as shown in FIG. 13, a ribbon cassette 10
When the collection ribbon supply reel 11 and the collection ribbon take-up reel 16 are mounted on the carriage 1, the collection ribbon supply reel 11 and the collection ribbon take-up reel 16 are arranged outside the side plate 42 of the carriage 1. Therefore, these reels 11,1
The arrangement of the ribbon cassette 6 has no effect on the increase in the total height, and the total height is increased by the thickness of the ribbon cassette 10, so that the increase in the total height can be suppressed as much as possible. In addition,
In order to do this, it is necessary to make the distance between the reels 11 and 16 slightly larger than the distance between the side plates 42 and 42 of the carriage 1.

Further, when the ribbon cassette 10 is attached to the carriage 1, the second gear 46 for printing ribbon on the ribbon cassette 10 side is opened as shown in FIG.
meshes with the small diameter gear portion 38 of the first gear 37 for printing ribbon. Further, as shown in FIG. 6, the crown gear 59 on the ribbon cassette 10 side meshes with the second collect ribbon gear 41. Since the above-mentioned positioning means is located near these meshing positions, the meshing relationship can be maintained normally.

In this way, the ribbon cassette 10 is connected to the carriage 1.
While the printer is attached to the printer, type selection is made, and then printing is performed by the printing mechanism shown in FIG. Before printing the next digit, it is necessary to move the printing ribbon 19 by a predetermined distance so that the new printing ribbon surface faces the hammer 8 in preparation for the next printing. The feeding operation of this printing ribbon 19 will be explained next.

When feeding the printing ribbon 19, the DC motor 2
3 (drive side belt gear 24) rotates in the direction of arrow A as shown in FIG. Then belt 29
, the driven side belt gear 28 rotates in the direction of arrow B. Since the large diameter gear portion 36 of the idler 33 is always meshed with the gear 30 of the driven side belt gear 28, the idler 33 rotates in the direction opposite to the direction of arrow B, and the gap between the idler 33 and the leaf spring 34 (FIG. 7) The rotating arm 31 is rotated in the direction of arrow C as shown in FIG.

With this rotation, the idler 33 moves to the first gear 37 for printing ribbon while being engaged with the gear 30, and the small diameter gear portion 35 of the idler 33 moves to the first gear 37 for printing ribbon while being engaged with the gear 30.
It meshes with the large diameter gear part 39 of. This idler 3
3 and the first gear 37 for printing ribbon, the driving force of the DC motor 23 is transmitted to the drive side belt gear 24, the belt 29, the driven side belt gear 28, and the idler 3.
3. The rotational force of the printing ribbon 19 is transmitted to the rotating plate 49 via the first gear 37 for printing ribbon and the gear 46 for printing ribbon, and the printing ribbon 19 is wound onto the take-up reel 12 by the rotational force of the rotating plate 49. The flat side faces the hammer 8. This printing ribbon 19
The amount of winding is controlled by the rotation angle detection section 27 (seventh
This is done by detecting the rotation angle of the DC motor 23 (see figure). In this way, the printing ribbon 19 is intermittently wound one after another at a predetermined pitch for each printing, and as the outer diameter of the printing ribbon roll 50 (see FIG. 3) becomes larger, the arm 51 is rotated for printing. It rotates in the direction away from the second gear 46 for ribbon.

Next, print correction will be explained. As shown in FIG. 2, the collection ribbon 20 is located below the print ribbon 19, so when correcting printing, rotate the platen 4 in the direction of arrow D as shown in FIG. Return the printed portion 63 to the position facing the collection ribbon 20. In this embodiment, the collection ribbon 20 is made of an adhesive ribbon, which is pressed against the printed portion 63 on the paper 3, and correction is performed by peeling off the carbon particles on the printed portion 63 using adhesive force. In order to ensure the removal of these carbon particles and make clean corrections, the size of the collect character 22 is made smaller than the other type parts 21 as shown in FIG. 4, and as shown in FIG. 15. 1 character as shown (in this illustration, the letter "H" is printed)
The system is now divided into multiple areas and revised sequentially.

This will be explained using FIGS. 14 to 16. The example shown in Figure 15 A to B is a 10-pitch printing format (printing 10 characters per inch).
An example of correction is shown below.

As shown in Figure 15 A, each character has a character area.
X ₁ , X ₂ , X ₃ ... (virtual areas) are provided consecutively in the horizontal and vertical directions, and in this example, the character "H" printed in character area X ₂ is erased. It shows. One character area X is equally divided into a plurality of vertically elongated collect areas (six in total in this example) C ₁ to C ₆ (virtual areas). The ribbon contact surface of the collect character 22 is 1
It is equal to one collect Elijah. Note that each pitch of P ₁ to _{P 5} in the figure indicates the minimum movement pitch of the carriage 1.

Normally, during printing, the stop position of the carriage 1 is at a position that coincides with the vertical center line of the printed characters (printed portion 63), that is, on _P1 . When the electromagnetic solenoid 7 is energized based on the first collect signal and the collect character 22 is struck with the hammer 8, the first collect area corresponding to the center of the upper stage of the printing section 63 is C ₁
Corrections will be made. FIG. 16A is a diagram showing how the collection ribbon 20 is used at this time, and the shaded area in the figure is the ribbon usage area 64.

Next, leave the platen 4 as it is and move the carriage 1 slightly to the right to point _P3 . This movement from P ₁ to P ₃ corresponds to two pitches of the minimum feed pitch of the carriage 1. At the same time, as shown in FIG.
8 rotates in the direction of arrow F. This causes the idler 33 to rotate in the direction opposite to the direction of arrow F,
The rotating arm 31 is rotated in the direction of arrow G using the frictional force generated between the plate spring 34 (see FIG. 8).

With this rotation, the idler 33 moves to the first collect ribbon gear 40 side while being engaged with the gear 30 and engages with it, and the driving force of the DC motor 23 is transmitted to the drive side belt gear 24, the belt 29, and the driven side belt gear. 28, idler 33, first gear 40 for collection ribbon, second gear 4 for collection ribbon
1 and the crown gear 59 to the collection ribbon take-up reel 16, and feeds the collection ribbon 20 by a dimension corresponding to the width of the collection character 20. The feed amount of the collection ribbon 20 is controlled by detecting the rotation angle of the DC motor 23 with a rotation angle detection section 27 (see FIG. 7). Arrow H shown in FIG. 16 indicates the direction in which the collection ribbon 20 is fed. After that, by removing the electromagnetic solenoid 7,
As shown in the 15th c, the collection area C ₁
The second collect area C ₂ to the right of is corrected. FIG. 16B shows how the collection ribbon 20 is used at this time.

Next, leave the carriage 1 as it is and slightly rotate the platen 4 in the direction opposite to the direction of the arrow D. At the same time, the collection ribbon 20 is fed by a predetermined distance as described above, and the electromagnetic solenoid 7 is removed as shown in FIG. Modify the third collection area _C3 at the right end of the lower row as shown in (d).

Next, leave platen 4 as it is and move carriage 1.
is moved slightly to the left to position P ₁ , and the collection ribbon 20 is sent to the first position with a correction operation.
Modify the fourth collection area _C4 as shown in Figure 5E. Continue to leave platen 4 as it is, move carriage 1 slightly to position P ₄ ,
Repeat the same operation and this time correct the collect area _C5 as shown in the same figure.

Next, while leaving the carriage 1 as it is, the platen 4 is slightly rotated in the direction of arrow D (see Fig. 14), and the collect ribbon 20 is fed by a predetermined distance, and a corrective operation is performed to move it to the last collect area as shown in Fig. 15 G. Modify C ₆ . This completes the correction of the printing section 63, returns the carriage to position P ₁ , rotates the platen 4 in the direction opposite to the direction of arrow D (see FIG. The printer stops at a position facing the printer and prepares for the next print. Note that, as shown in FIG. 16, the collection ribbon 20 is sequentially moved in the direction of the arrow H for each correction operation of each collection area, so the ribbon-used portion 64 becomes a band-like shape and is effectively used without waste.

Figure 17 A to F are 12 pitches (12 pitches per inch).
An example of modification is shown for the case of the format for printing characters).

As shown in A of the same figure, carriage 1 is initially on _P1 , so the first collect area _C1 in the center of the upper row is corrected by the collect operation, and then carriage 1 is moved to position _P1 as shown in B of the same figure. Correct the second collection area _C2 by making a slight movement. Next, as shown in Figure C, after slightly rotating the platen 4 while leaving the carriage 1 as it is, the third collection area _C3 is corrected. Next, as shown in Figure D, return the carriage 1 to _P1 and move it to the fourth collection area _C4.
Then, move the carriage 1 to _P3 and correct the fifth collection area _C5 as shown in E of the same figure. Finally, leaving the carriage 1 as it is, the platen 4 is slightly rotated and returned to correct the sixth collection area _C6 .

Figure 18 A to F are 15 pitches (15 pitches per inch).
This example shows an example of a modification for the format of printing characters. This example differs only in the collection area from the 12-pitch type, and the feeding order of the carriage 1 and platen 4 is the same as the 12-pitch type, so a description thereof will be omitted.

As shown in FIGS. 15, 17, and 18, even if the character pitch, that is, the size of the characters, is different, when correcting the edges in the character area,
The transport pitch of the carriage 1 can be finely adjusted, for example from P ₁ to _{P 5} , so that the edge of the striking surface of the collect character 22 coincides with the edge of the character area. Incidentally, such fine adjustment of the carriage transfer is facilitated by using a rotary or linear pulse motor as the carriage transfer means.

FIGS. 19 and 20 are explanatory diagrams showing other examples of dividing the collect area. In the case of FIG. 19, the collect area is divided into a plurality of parts in the vertical direction, and by intermittently and minutely moving the carriage 1 with respect to the printing section 63 at a predetermined pitch, each collect area is corrected one after another. . In the case of FIG. 20, the collection area is divided into a plurality of parts in the horizontal direction, and is corrected by slightly moving the platen 4 with respect to the carriage 1 at a predetermined pitch.

[Effect of idea]

As explained above, according to the present invention, it is possible to switch the drive of the print ribbon and collect ribbon transport means simply by selecting (switching) the rotation direction of the drive motor. The switching mechanism and control of the transfer means are simplified, and the switching timing is accurate and reliability is improved, which is a remarkable effect.

[Brief explanation of the drawing]

The figures are all for explaining the embodiments of the present invention. Figure 1 is a plan view of the cartridge with the cassette removed, Figure 2 is a side view of the main parts showing the printing mechanism, and Figure 3 is a ribbon cassette. Figure 4 is the bottom view of the daisy wheel, Figures 5 and 6 are the top views of the daisy wheel.
The figures are top views of the ribbon drive mechanism, Figures 7 and 8.
9 is a partial side view of the ribbon drive mechanism, FIG. 9 is a partial plan view of the ribbon cassette, FIG. 10 is a side view of the reel support member, and FIG. 11 shows the state in which the reel support member is attached to the ribbon cassette. 12 and 13 are schematic diagrams for explaining the positioning of the ribbon cassette with respect to the carriage. FIG. 14 is a side view of the main part showing the print correction mechanism. An explanatory diagram showing the correction order per character, Figures 16A to 16F are explanatory diagrams showing the state of use of the correct ribbon during print correction, and Figures 17A to F.
F and FIGS. 18A to 18F are explanatory diagrams showing the order of correction of other character sizes, and FIGS. 19 and 20 are explanatory diagrams showing other examples of dividing the collect area. 1... Carriage, 3... Print paper, 4... Platen, 5... Daisy wheel, 7... Electromagnetic solenoid, 8... Hammer, 9... Ribbon drive mechanism, 10... Ribbon cassette, 11... Printing Ribbon supply reel, 12...Print ribbon take-up reel, 13, 15...Reel support member, 14...Collect ribbon supply reel, 16...Collect ribbon take-up reel, 19...Print ribbon, 20 …
...Collection ribbon, 21...Type section, 22...Collection character, 23...DC motor, 28...
... Driven side belt gear, 30 ... Gear, 31 ... Rotating arm, 33 ... Idler, 34 ... Leaf spring, 37 ... First gear for printing ribbon, 40 ... First gear for collect ribbon, 41 ... ...Second gear for collection ribbon, 44...Positioning hole, 45...Positioning claw, 46...Second gear for printing ribbon, 56
... L-shaped locking part, 57 ... locking claw, 58 ... mounting part, 59 ... crown gear, 60 ... positioning protrusion, 61 ... claw hooking part, 62 ... positioning contact part, 63...Printing part, X...Character area, C...
Collect Elijah.

Claims (1)

[Scope of utility model registration request] A gear of the print ribbon transport means, a gear of the collect ribbon transport means arranged at a predetermined distance from the gear, a drive gear connected to a drive motor capable of forward and reverse rotation, and a gear always meshing with the drive gear. a moving gear disposed between the gear of the printing ribbon transport means and the gear of the collection ribbon transport means, and capable of selectively meshing with either one of these gears;
a rotating arm that supports the moving gear at its free end and whose base is rotatably supported on the axis of the driving gear; and a pressing spring member that applies a frictional force against the rotation of the printer, wherein by rotating the drive motor in forward and reverse directions, the rotating arm is moved to the printing position by the frictional force of the pressing spring member. The moving gear is selectively engaged with one of the two gears by rotating the gear of the ribbon transport means or the gear of the collect ribbon transport means, and the printing ribbon transport means or the collect ribbon transport means is rotated. A ribbon feeding mechanism for a printer, characterized in that it is configured to be driven.