JPH0427033B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a small type serial printer capable of printing in multiple colors.

Conventionally, regarding serial printers capable of two-color printing, there are large-sized so-called daisy printers, badminton printers, golf hole printers, etc. that use two-color ribbons, and for small-sized printers such as those used in calculators, the following There are only types that are briefly explained in . An example is the serial printer type proposed in Japanese Patent Application Laid-open No. 56-28885 (although it can only print in one color), which uses basically two types of type that carry type around a circumference. Printing is performed while the wheel moves step by step in the direction of the digits on the guide shaft.In the standby state, of the two type wheels, the first color type wheel is on the lowest digit side, and the second color type wheel is on the lowest digit side. The type wheel for the color is located on the side of the most significant digit, and when printing the first color, the type wheel for the first color is moved up in order from the lowest digit, printing is done, and the second color is printed. When printing, printing is performed while the second color type wheel is successively lowered from the upper digit to the lower digit.

When a printer is used with a calculator, etc., the number of digits handled by the calculator is often much smaller than the maximum number of digits that can be handled.
In the case of color printing, since printing starts from the lower digit standby position side, the type wheel can return to the standby position as soon as the necessary printing is completed, so there is no problem in terms of printing speed, but in the case of second color printing, Since it is necessary to print a considerable number of blanks from the upper digits and then print the necessary numerical value to the lowest digit, the printing wheel must always move by all the digits of the numerical value, resulting in an extremely slow printing speed. It was hot. Therefore, the mental irritation caused to users of such printer-equipped calculators during operation was also a major drawback. Furthermore, this type of printer cannot perform multi-color printing of a third color or higher at all.

The present invention has been made in view of the above drawbacks.

The object of the present invention is to provide a novel type two-color printing serial printer that can achieve almost the same printing speed for the same number of digits and the same print content in both the first color printing and the second color printing. It's about providing structure.

Another object of the present invention is to provide a serial printer structure capable of printing symbols in a third color.

Yet another object of the present invention is to provide a serial printer structure with any type of printing color.

Hereinafter, the content of the present invention will be explained in detail together with examples.
FIG. 1 is a plan cross-sectional view showing one embodiment of a serial printer according to the present invention, and unnecessary parts are omitted in order to explain the content of the present invention in an easy-to-understand manner. Reference numeral 1 indicates a platen, and reference numeral 2 indicates printing paper, which is fed and guided along the platen 1 to the front of a type ring 3 made of rubber or the like by a paper feed roller and a paper guide device (not shown). The type ring 3 is a ring that supports 14 types (3R, 3B, 3S) on the circumference, as shown in the cross-sectional view of the type in FIG. , and is wound around the holding member 4 of the type wheel. To explain in detail, the holding member 4 has a substantially cage-like shape so that it can be easily rubbed as shown in FIGS.
a (14 pieces) and circumferential ribs 4c, 4d and 4e
and flange 4b (42
The type ring 3 is held in such a manner that the type base 3a is held in the hole. The holding member 4 also has a boss portion 4f at the center of the car, and the boss portion 4f is slidable in the axial direction of the guide shaft 5, which has a cross-sectional shape like a flat cut of the circumferential surface of a cylinder. The left end of the boss portion 4f (Fig. 1) is biased by a compression coil spring (biasing means) 6 in the direction of arrow A. has been done. The seat 19 of the compression coil spring 6 rotates integrally with the guide shaft 5. 7 is a hammer which is a printing means, and one end of the pressing part 7a pushes out the type base 3a toward the platen 1 as shown by the two-dot chain line in FIG.
By pressing R, 3B, or 3S, the ink on the printing surface is transferred onto the printing paper 2. The means for supplying ink to the typeface is an ink roll 30 arranged so as to be in constant rolling contact with the typeface, as shown in FIG. 8 (detailed explanation will be given later).

The hammer 7 has a shaft 8a (part of the operation trajectory determining means of the pressing part 7a) mounted on a carriage 8 which can move in the axial direction of the guide shaft 5 basically independently of the holding part 4 within a certain range. The arm 7 is held rotatably in the
b receives a driving force from the arm end 9a of the hammer drive lever 9 so that the hammer 7 rotates counterclockwise in FIG. The hammer drive lever 9 is rotatably held on a shaft 8b mounted on the carriage 8, with one end fixed on the hammer drive lever 9 and the other end attached to the bowl-shaped cam surface 10a of the hammer drive cam 10. It carries a torsion coil spring 11 which is to become a follower of the. The hammer drive cam 10 is
In the axial direction of the guide shaft 5, the guide shaft 5 is sandwiched between end surfaces 8c and 8d of a hole provided in the carriage 8.
For example, the drive shaft 12 is disposed parallel to the guide shaft 5 and has a cross-sectional shape substantially similar to that of the guide shaft 5. The drive shaft 12 is slidably slidable in the axial direction and integrally fitted in the rotation direction. That is, when the drive shaft 12 rotates counterclockwise when viewed in the direction of arrow B for the printing operation, the hammer drive cam 10 also rotates in the same direction, during which time the follower portion 1 of the torsion coil spring 11 first rotates.
1a moves approximately in the direction of arrow B, the hammer drive lever 9 rotates clockwise, and the arm end 9a moves in the direction of arrow B.
arm 7b is pushed approximately in the direction of arrow A, the hammer 7 is rotated counterclockwise, and one end 7a of the hammer 7 pushes the type base material 3a toward the platen 1 side to print, and then the bowl-shaped cam surface 10a is pressed. The follower part 11a of the torsion coil spring 11 is too thick and the follower part 11a is opposite to the arrow B.
In the process of moving in the direction (hammer return stroke), the hammer drive lever 9 and the hammer 7 move in the opposite direction to the above explanation. It borrows the force of a tension coil spring 20 whose other end is hooked onto the carriage 8.

The printer according to the present invention is a serial printer, in which arrows B are
Printing must be performed while being carried forward in the direction. Therefore, the following method is used to carry the carriage 8. That is, the end faces 8e and 8f of the hole provided in the carriage 8
A protruding strip 13a having a cylindrical shape and having a lead on its circumferential surface is fitted to the drive shaft 12 so as to be slidable in the axial direction and integrally in the rotating direction.
During the carry stroke, the strip 13a of the carry cam 13, which supports
The carry cam 13 meshes with the teeth 14a disposed on the positioning plate 14, which are disposed in the axial direction of the drive shaft 12. The carriage 8 is carried up integrally. As is clear from the above description, the hammer drive cam 10 and the carry cam 13
Since the is designed to rotate integrally with the drive shaft 12, the angle of 360° of one rotation is divided into two so that printing and carrying can be completed with one rotation of the drive shaft 12. During the period of movement, the strip 13a of the carry cam 13 does not produce a lead (the carriage 8 does not move in the axial direction of the drive shaft 12), and after the printing operation is completed, the strip 13a produces a lead. The cam phase is determined so that the portion meshes with the teeth 14a and carry is performed.

Further, in order to return the carriage 8 to the standby position after completing printing while carrying up to an arbitrary digit, the positioning plate 14 (that is, the tooth 14a) is forcibly separated from the strip 13a. A tension coil spring 21 is tensioned between a portion of the carriage 8 and a stationary portion such as the frame 15 as a means for applying a return force to the carriage 8 at this time.

Next, a mechanism that enables two-color printing, which is the main objective of the present invention, will be explained.

In the example of the present invention, a serial printer used for a calculator etc. prints from the lower digits (on the right side on the printing paper 2), and in FIG. It is a diagram when the coil spring 6 and the tension coil spring 21 are pressed to the standby position (right end). Between the flange 4b of the holding member 4 and the frame 15, an end surface 16k is in contact with the carriage stopper 18, and the guide shaft 5 is fitted so as to be slidable in the axial direction thereof and rotatable in the rotational direction thereof. A member P16 that is attached to the guide shaft 5 is slidable in the axial direction of the guide shaft 5, and one end is connected to the part 2 of the guide shaft 5.
The member Q is biased toward the member P16 side by a compression coil spring 25 (biasing means) seated on the member P16, and is fitted so as to rotate integrally with the guide shaft 5 in the direction of rotation.
17, and a carriage stopper 1 fixed to the frame 15 and abutting against the carriage portion 8a-1.
8 and the outer circumferential surface of member P16, and one end surface 2
3a is in contact with the flange 4b of the holding member 4, and the other end surface 23b is in contact with the surface 18a of the carriage stopper 18.
member R facing with a little clearance from
(Part of the trigger means) 23 is present. Part P
Opposing surfaces 16b and 17b of each of the 16 members Q17
At the top, there are at least a pair of teeth 16c and 17c that can engage with each other in the direction of rotation when the member P16 and the member Q17 rotate about the guide shaft 5.

For a better understanding of the shapes of member P16 and member R23, member P16 and member R2 shown in FIG.
This will be explained with reference to the perspective view of No. 3. Part P16
is a part having a substantially cylindrical shape with the round hole 16d fitted into the guide shaft 5 as its center and is approximately symmetrical with respect to the center line of the round hole 16a, and has a circumferential surface 16j bearing the inner circumferential surface 23c of the member R23 on the outer circumferential surface. and a portion of the carriage 8, 8g.
-1 and a side surface 8 of the carriage part 8g-1 perpendicular to the axial direction of the guide shaft 5.
g-2, two stepped surface-shaped portions 16f and 16g that abut and engage in a certain operating state, and a surface 16h and a stepped surface 16 perpendicular to the surface of the portion 16f at one end of the portion 16f.
have l. As explained above, substantially triangular teeth 16c are set on the annular surface 16b perpendicular to the guide shaft 5 at the back of the inner cylinder of the member P, and the teeth 16c and the end face 17b of the member Q17 are connected to each other. It is possible to engage with the raised approximately triangular teeth 17c in the rotational direction.

The member R23 is a substantially cylindrical component as shown in FIG. 3, and includes a cylindrical inner circumferential surface 23c that is supported by the outer circumferential surface 16j of the member P16, a cylindrical outer circumferential surface 23d, and a cylindrical wall portion. Notch 23e provided in
, a step surface 23f provided at the end of the notch 23e on the end surface 23b side of the cylinder, a wall 23f-1 parallel to the axial direction provided at one end of the step surface 23f, and a wall 23f-1 provided on the cylinder outer peripheral surface 23d. 23g of cylindrical protrusions
have.

Now, in Fig. 1, there are three type wheels 3, and the active annual ring 3 on which the type 3S is placed is basically a symbol type ring 3-3S for printing the type of numerical value of the printed line. It is usually printed in the first digit. The type wheel 3 on which the type characters 3B are placed is basically a numeral type wheel 3-3B for printing numerical values, and is coated with first color ink and used for first color printing. The type wheel 3 on which the type 3R is placed is basically a numeral type wheel 3-3R for printing numerical values.
A second color ink is applied and used for second color printing.

Figure 1 shows a state in which any of the 14 types 3S can be selectively printed in the first digit, and the drive shaft 12
is not rotating, and the guide shaft 5 is being rotated clockwise when viewed in the direction of arrow B by a drive source (such as a motor and a gear train) that is not shown. At this time, the guide shaft 5, the member Q17, and the holding member 4 are rotating integrally, and the member R23 is held at the end surface 23a by the holding member 4.
Although there is a possibility that the carriage 8 may rotate at first due to the rotational force due to friction with the wall 23f,
Rotation can be stopped from the moment -1 is locked. However, since the member P16 pivotally supports the member R23 and the end face 16k is in friction with the carriage stopper 18, the rotation due to the frictional force received from the guide shaft 5 or the holding member 4 is braked, and eventually The tooth 16c is pushed by the tooth 17c (the member P16 and the member Q17 are engaged in the rotational direction), and this state continues until a point in time described below.

Also, at this time, naturally, the pressing part 7a of the hammer 7
is opposite the symbol type wheel 3-3S. As explained previously, the holding member 4, that is, the type wheel 3, rotates integrally with the guide shaft 5, so that the type wheel 3 is rotated so that the desired type 3S stops facing the printing paper 2. A detector 24 (in FIG. 1, 2
4-1 is a disk fixed to the guide shaft 5, and carries electric conductors 24-4, 24-5 arranged so as to be in contact with the fixed detection flanges 24-2, 24-3. The detection brushes 24-2 and 24-3 are pressed toward the disk 24-1 by springs. The electric conductors 24-4 and 24-5 are always conductive, and at the radial position on the disk 24-1 where the detection brush 24-3 contacts, the electric conductor 24-4 is completely continuous in the circumferential direction. , the electric conductor 24-5 at the radial position on the disc 24-1 in contact with the detection brush 24-2.
contacts the detection brush 24-2 discontinuously at every angle obtained by equally dividing 360° into the number of printed characters on one printing wheel 3 (14 in this example).
That is, the rotation of the disc 24-1 causes the terminals 24-6, 24 of the detection brushes 24-2, 24-3 to
A conduction signal (character position detection signal) corresponding to the character position is obtained between -7. ), an electromagnet or the like (not shown) is excited to activate the stop means (character selection means) of the guide shaft 5,
At the same time, the mechanism that stops and holds the rotation of the drive shaft 12 is released and the rotation of the drive shaft 12 is stopped and held (character selection).
Look in the direction of arrow B and turn counterclockwise once.
In the course of this one rotation, the desired characters (symbols) on the type wheel 3-3S are printed on the printing paper 2 as described above, and a carry is carried out by one digit. At the same time as the carry is completed, the rotation of the drive shaft 12 is stopped and maintained, the stopped state of the guide shaft 5 is released, and the type wheel 3 starts rotating and becomes ready for character selection again.

FIG. 4 shows this state, and portions unnecessary for this explanation are omitted from FIG. 1. In this state, the strip 13a of the carry cam 13
is the tooth 14 of the teeth 14a on the positioning plate 14.
It meshes with a-1. The amount of carry of the carriage 8, that is, the hammer 7, from the first digit to the second digit is adjusted by the position of the tooth 14a-1.

In this carrying process, a portion of the carriage 8
g-1 is carried up by pushing the step surface 23f of member R23 with its end surface 8g-2. Therefore, member R
23, that is, the amount of movement of the type wheel 3 in the direction of arrow B is almost the same as the amount of movement of the carriage 8, that is, the hammer 7 (the difference is the minute distance between the stepped surface 23f and the end surface 8g-2 in the standby state in FIG. 3), the type wheel 3-3S and the pressing portion 7a of the hammer 7 remain opposed to each other. In this process, the engagement between the teeth 16c and 17c is caused by the member Q17
Since it continues to be biased toward the member P16 by the compression coil spring 25, it does not come off.

Therefore, select the desired character in this second digit,
It is possible to print and carry to the third digit.

At the time when the carry is carried to the third digit, the strip 13a of the carry cam 13 touches the tooth 14a of the positioning plate 14.
2, the pressing part 7a of the hammer 7
The relative positions of the carriage 8, member P16, member Q17, member R23, holding member 4, and type ring 3 are the same, except that the facing positional relationship with the type wheel 3-3S is exactly the same as that of the previous digit (second digit). The positional relationship is exactly the same as the second digit (the state shown in FIG. 4).

The print color in the subsequent digits is determined by how the character position in the third digit is selected. The mechanism is the main content of the present invention. The contents are as described below.

As shown in Figure 3, from the printer of this example,
When viewed with reference to a portion 8g-1 of the carriage 8, which is fixed with respect to the rotational direction of the type wheel 3, the position of the type on the type wheel 3 is changed by rotating the type wheel 3, that is, the disk 24-1. A character position detection signal Tn (n=1 to 14) corresponding to Tn is obtained.
The projections of parts 16f and 16g of member P16 onto the virtual plane Tp plotted are 16f-
This is the region indicated by T, 16g-T.

First, first color printing will be explained.

Projection 16f-T of the current character position detection signal Tn
If you select a character corresponding to T ₅ and T ₆ (hereinafter referred to as the B signal) that is sufficiently included in the signal including machine tolerances (hereinafter referred to as the case of B selection), the selected character is converted into 3 digits. A carry is performed at the fourth digit, but during the carry process, the projection of the portion 8g-1 of the carriage 8 onto the portion 16f in the direction of arrow B is completely included in the direction of rotation of the member P16. I end up. In other words, 8g-1 and 16f face each other. On the other hand, when carrying from the third digit to the fourth digit, the protrusion 23g on the member R23 is forced to rotate along the cam surface 26 fixedly provided on the frame 15 etc., i.e. As shown by arrow C in FIG.
When rotated, a portion of the carriage 8 weighs 8g.
-1 is relatively rotated into the circumferential width of the notch 23e. When transitioning to this state, member R
23. Since the member P16 and the holding member 4 are integrally urged toward the lower digit side by the compression coil spring (biasing means) 6, until the part 8g-1 of the carriage 8 and the part 16f of the member P16 come into contact , member P16, member P23, and holding member 4 move toward the lower digit in such a way that 8g-1 is sandwiched between notches 23e. At this time, the member Q17 is naturally also pushed back to the lower digit side. The spring force of the compression coil spring 25 is designed to be smaller than the spring force of the compression coil spring 6.

FIG. 5 shows the state immediately after the carry is carried to the fourth digit through the above process. At this time, the pressing part 7a of the hammer 7 is for first color printing, and in the case of a calculator, is completely opposed to the first color printing type ring 3-3B, which is mainly used for printing numerical information. There is. The position of the portion 16f is designed so as to be like this.

In order to select the fourth digit character, the guide shaft 5, member Q17, member P16, member R23 and holding member 4 start rotating from the state shown in FIG. , and the surface 16h of member P16 is 8g-1
Since the member P16 and the member R
The rotation of 23 is stopped. At this time, the teeth 16c and 17c are in an engaged state, but these teeth have a shape that disengages in an overload state (for example, a triangular tooth as described in the present invention or a similar shape). ) is designed with compression coil spring 6
Since the spring force is strong, the compression coil spring 25 is bent, and the member Q17 eventually escapes to the lower digit side. Therefore, it will be understood that since the pressing portion 7a of the hammer 7 and the type wheel 3-3B remain opposed to each other, any character can be selectively printed at the fourth digit. According to the explanation up to now, the axial relative position between the pressing part 7a and the type ring 3-3B will naturally be carried up from the 5th digit onwards without changing, and any character on the type ring 3-3B will be selected. It is possible to print, therefore, printing in the first color is possible from the fourth digit onwards. Basically, after the fourth digit, it is preferable that the teeth 16c and 17c are disengaged, and care must be taken to ensure the free length of the biasing means 25 and the spring force.

Next, the second color printing will be explained.

As shown in FIG. 3, the character position detection signal Tn,
When a character corresponding to T ₁ and T ₂ (hereinafter referred to as R signal) that is sufficiently included in projection 16g-T including machine tolerances is selected (hereinafter referred to as R selection case), the selected Print the character in the third digit and press 4
A carry is carried out to the digit, but in this case, the part 8g-1 of the carriage 8 is moved to the part 16 of the member P16.
g, so when carriage 8 is carried to the fourth digit, member P16 and member R2
3. The holding member 4 has moved integrally toward the lower digit to a position where the end surface 8g-2 of the portion 8g-1 of the carriage 8 and the portion 16g abut. At this time, the member Q17 is naturally also pushed back toward the lower digit.

FIG. 6 shows this state. At this time, the pressing part 7a of the hammer 7 is for second color printing, and in the case of a calculator, is completely opposed to the second color printing type ring 3-3R, which is mainly used for printing numerical information. . The position of the portion 16g is designed so as to be like this. Therefore, even if an arbitrary character on the type wheel 3-3R is selected and printed at the fourth digit and carried to the fifth digit or later, the relative position in the axial direction between the type wheel 3-3R and the pressing part 7a remains unchanged. , second color printing is possible from the fourth digit onwards.

In the explanation so far, we have assumed that the third digit will be printed, but in reality, only a certain group of characters can be selected for B selection and R selection, so in order to make the printing easier to see, in the case of these B selections Include at least one blank printable character (printed character) in each of the character group (character group B) and the character group for R selection (character group R), and print these characters in the third digit. It is preferable to select B selection or R selection.

In addition, in the explanation so far, in the process of carrying from the third digit to the fourth digit, after the carry is carried up, the pressing part 7a of the hammer 7 and the type ring 3-3B or 3-
A rotatable member R23 is fixed to a frame or the like at a portion pivotally supported by member P16 as a means (trigger means) for providing a tightening force for moving the holding member 4 toward the lower digit so that 3R faces the member P16. Combination of cam surfaces 26 provided as shown in Fig. 3
As described above, there is also a method as shown in FIG. 7 as another embodiment. This is a partial change to a new method by omitting the mechanism part for B selection or R selection in FIG. 1. The difference is that a lever 26 that can be inserted into the gap between the stepped surface 16l of the member P16 and the end surface 8g-2 of the portion 8g-1 of the carriage 8 is used in place of the member R23 in the standby state (same as the state shown in FIG. 1). That's what I'm doing. A guide for inserting and extracting the lever 26 into and out of the gap is provided on the carriage 8 (not shown), and this method includes, for example, a shaft support means for providing the rotation center of the lever 26, and a guide for inserting and removing the lever 26 into the gap. is a guide such as a wall to prevent involuntary movement in the direction of arrow B or in the opposite direction of arrow B.

As shown in FIG. 7, as the lever 26 is pushed up while being inserted between the step surface 16l and the end surface 8g-2, the pressing portion 7a of the hammer 7 and the type ring 3
-3S's facing relationship remains unchanged. However, as in the first embodiment, while the carriage 8 is being carried up from the third digit to the fourth digit, the lever 26 is forcibly removed by a cam fixedly provided on the frame or the like. With this structure, B selection or R
A trigger for relative axial movement of the carriage 8 and the holding member 4 for selection can be provided. Depending on the case, this lever 26 is always on the stepped surface 16l.
It is preferable that it is biased by a biasing means so as to be inserted into the gap between the end face 8g-2 and the end face 8g-2. In that case, after B selection or R selection is made so that the lever 26 can be easily rubbed, the lever 26 is held and held on the outer circumferential surface 16j of the member P16 by the biasing means.

Furthermore, in the above description, the teeth 16c on the member P16 and the teeth 17c on the member Q17 are made into a pair, but they may be made into two pairs, for example. For example, two pairs
If they are arranged 180 degrees apart, that is, in symmetrical positions, the teeth 16c and 17c will mesh when the carriage 8, holding member 4, etc. return to the standby position (the state shown in Figure 1) after printing one line. When this happens, there are two cases in which the rotational direction phase relationship between member P16 and member Q17 differs by 180 degrees.
If 6f and 16g are arranged in pairs with the same shape at symmetrical positions with respect to the axis of the guide shaft 5, B selection and R selection can be made without any problem.

In this case, the character position detection signal Tn that enables selection of B and R at the third digit arrives earlier, so 1
The time required to print a line is short. Moreover, it goes without saying that the number of pairs described above may be three or more.

Additionally, the cam surface 26, which is fixedly provided on the frame or the like and plays a part of the role of triggering means for B selection or R selection, is triggered between the third and fourth digits as described above. It may be provided between other girders instead of being provided separately. The difference is that the characters on the type ring 3-3S are the 2nd and 3rd digits on the cam surface 26.
1 if the trigger is set between the digits.
1, 2, 3 if the cam surface 26 is provided so that the trigger is made between the 4th and 5th digits only.
It is possible to print on the digit. In other words, it is possible to selectively control printing in the first color or the second color for a higher-order digit than an arbitrary digit.

In addition, in the above explanation, the number of printed characters in one printing wheel 3 has been assumed to be 14, but it is not limited to this, and the explanation has been given using an example of one symbol printing wheel 3-3S. However, even in the case where there are two or more symbol type wheels, the above explanation can be applied to the symbol type wheel on the most significant digit side and onwards, so the present invention is not limited to one symbol type wheel 3-3S. .

In addition, in this embodiment, the portion 16f for B selection,
A region 16g for R selection is provided on the member P16, and, for example, regions for third and fourth colors are also provided, and a type wheel 3 for printing in the third and fourth colors and an inking means are provided. By providing this, it is possible to realize a type-type multicolor printer having an arbitrary number of printing colors.

Next, the ink supply means will be explained.

FIG. 8 is a plan sectional view of one embodiment showing only the portion related to ink supply. Reference numeral 30 denotes a cylindrical ink roll made of a material such as a foam material impregnated with ink, which consists of an ink roll 30B for a first color and an ink roll 30R for a second color. Or notch 8
h and 8i, and 30B and 30R are disposed with a flange-shaped separator 29a integrally provided on the ink roll shaft 29 sandwiched therebetween. 28 is an ink roll cover pivotally supported by an ink roll shaft 29;
c and 28d sandwich the ink roll 30, and the arm ends 28a and 28b hold the flange 4b of the holding member 4.
and sandwiching the circumferential rib 4e. Although not shown, in this state, the ink roll cover 28 is pushed in the direction of arrow D by a biasing means such as a spring provided on the carriage 8, so that the ink roll 30 is pushed onto the type letters 3S, 3B, and 3R. The ink is transferred onto the type. Since the holding member 4 is held between the arm ends 28a and 28b, even if there is a relative movement in the axial direction between the carriage 8 and the guide shaft 5 of the holding member 4 (for example, as shown by the two-dot chain line, the carriage 8 Even if the ink roll 30 and the type wheel move relative to each other), the above-mentioned relative positions in the axial direction between the ink roll 30 and the type wheel remain unchanged at all times.
-Touching 3R. Therefore, in this example, type 3
The digit where S is printed is always printed in the first color.

Naturally, the second separator 29b may be provided at the position of the ink roll 30B facing the circumferential rib 4c, and the color of the ink roll at the portion facing the type ring 3-3S may be set to the third color. In this case, a calculator or the like has the advantage of separating numerical information from symbol information indicating its classification, making the printed data easier to see.

Also, instead of holding the holding member 4 between the arm ends 28a and 28b, a groove is provided on the outer circumferential surface of the circumferential rib 4d, and a portion of the separator 29a near the outer circumference is inserted into the groove, and the ink roller 30 and type wheel 3
It may be possible to prevent relative movement with the

In addition, as an ink supply means, instead of the ink roll, the type wheel 3 itself may be made of a material that can be impregnated with ink, and may be impregnated with ink beforehand, and the ink can be easily applied to the type wheel. In order to do this, ink may be additionally supplied using an ink roll.

As explained above, in the case of first color printing, second color printing, and even multicolor printing, printing starts from the lowest digit, and in the case of first color selection (B selection) and In the case of two-color selection (R selection) and the case of selecting another color, the only difference is the timing of character selection in the digit where the selection is made (in the case of this embodiment, the third digit). Since it is,
If the same character combination and number of digits are printed, it is possible to print one digit in almost the same amount of time, which fully covers the shortcomings of the conventional method.Furthermore, it is possible to print in two colors, which did not exist before. , it is possible to realize a type-type serial printer that can have two or more completely independent symbol type wheels, and it is also possible to use another third color for symbol printing, or to select three or more printing colors for numerical information printing. This has the effect of making it possible.

The present invention has the following remarkable effects.

That is, the hammer member that presses the type onto the printing paper is mounted on the carriage, and the holding member that holds the type wheel is rotatable and slidable within the carriage, so that the control of the digits to be printed is simply carried out by the carriage. It is only necessary to carry up one digit at a time, so the carry control is simple, the mechanism is simple and compact, and the printing speed can be increased.

Further, the ink roll holder moves integrally with the holding member, with its position in the sliding direction being regulated by the holding member;
A mechanism in which the ink roll of a specific color always contacts a specific type ring at an accurate position, so that color mixing does not occur even when the type member slides, and it is possible to print in three or more colors. This greatly expands the degree of freedom when designing.

Furthermore, since the positional accuracy of the ink roll relative to the type wheel is ensured, there is no need to provide a large gap between the holding member and the ink roll holder to prevent color mixing, and the width of the ink roll and the width of the holding member can be minimized. This makes it possible to reduce the impact when the type member and ink roll return to the standby position, which improves reliability, produces quieter collision noise, and is compact and available in multiple colors. This makes it possible to provide a printer that does not cause color mixing due to color switching.

Therefore, it contributes to improving the printing quality of serial printers, making the device more compact, and increasing the printing speed.

[Brief explanation of drawings]

1, 4, 5, and 6 are plan sectional views showing one embodiment of the serial printer of the present invention, and state diagrams for each digit. FIG. 2 is a diagram showing a cross-sectional structure of the type wheel 3, holding member 4, and hammer 7. FIG. 3 is a perspective view of the member P. FIG. 7 is a partial plan cross-sectional view showing another embodiment of the present invention. FIG. 8 is a diagram showing an embodiment of the ink supply means. Here, 2...paper to be printed, 3B...type B for first color printing, 3R...type R for second color printing, 4...
... Holding member, 5 ... Guide shaft, 6 ... Biasing means, 7
...Hammer, 7a... Pressing part, 8... Carriage, 8a... Shaft (part of the means for determining the operating locus of the pressing part 7a), 8g... Part of the carriage, 12
...Drive shaft, 13...Carry cam, 13a...
Strip, 14... Positioning plate, 14a... Teeth, 12,
13, 13a, 14, 14a... Carry means, 1
6... Member P, 16c... Teeth, 16f, 16g...
...Part, 17... Member Q, 17c... Teeth, 16
c, 17c...Engagement means (teeth), 23... Member R,
25... Biasing means, 26... Cam surface, 23, 26
...Trigger means, 28...Ink roll cover, 29...Ink roll shaft, 30...Ink roll.

Claims (1)

[Scope of Claims] 1. In a serial printer that presses an ink roller against type to supply ink to the type to print in a plurality of printing colors, a carriage member installed movably in the direction of the printing column; , a plurality of type wheels having a plurality of types arranged on their surfaces; a holding member mounted on the carriage and rotatably and slidably supported within the carriage, to which the type wheels are attached; an ink roll impregnated with ink of a plurality of colors corresponding to each of the ring groups; and the ink roll is rotatably supported, and the position in the sliding direction is regulated by the holding member and moves integrally with the holding member. A serial printer comprising: an ink roll holder; and a hammer member that is held by the carriage and presses the selected type by rotating or sliding the holding member to print on printing paper.