JPS60201957A - Impact crossbar type dot printer - Google Patents

Abstract

PURPOSE:To permit a dot printing in an oblique direction of high density to enable to solve problems of ambiguity of printing in an oblique direction by forming ridges that are skew to a platen. CONSTITUTION:An impact crossbar type dot printer has ridges 19 on its platen 18, and a print hammer 14 which is placed against these ridges is scanned along a guide rail 13 in a direction vertical to that of feeding of a recording paper, and the flat impact portion which is provided in the tip of a hammer is made to strike the ridges 19 by crossing to perform the dot printing. These ridges 19 are formed obliquely with an angle alpha to the platen 18, and a printing of dots 33, 34 can be performed sequentially in an oblique line direction with a pitch (d) in a line direction of dot matrix hitherto used and a pitch (d'') almost equal to the former. Therefore, the dot printing is performed with high density in the oblique direction with a pitch (d'') almost a half of the dot pitch (d') hitherto used in the oblique direction and an ambiguity is eleminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to an impact crossbar complete dot printer that prints by crossing and colliding the impact portion of a printing hammer against the protrusion of a platen.

[Prior Art] Conventionally, this type of impact/crossbar dot printer has a platen having a plurality of linear protrusions parallel to the axial direction, and a recording paper feeding device disposed opposite to the platen and located in front of the platen. a carriage that scans in a direction perpendicular to the axial direction; a printing hammer provided on the carriage in a direction that is an angle perpendicular to the axial direction plus a correction angle for forming a straight dot array; The printing hammer has an impact portion provided at the tip thereof, and as the platen rotates and the printing hammer scans, the impact portion of the printing hammer crosses and collides with a linear protrusion parallel to the axial direction. There are some things that need to be printed.

However, as shown in FIG. 12, the protrusion 1 of the platen is formed parallel to the axial direction, so the dot 2
The bits d' in the diagonal direction of dot 2 are printed sequentially in the same direction as the recording paper feeding direction at a pitch of d<
d', and the bit d' of the dot 2 in the diagonal direction becomes relatively thick, making dot matrices such as characters and symbols having diagonal lines unclear and difficult to see. For example, to explain the character of the dot matrix of 7 rows and 5 columns, in the case of "4" in Fig. 13, the number written in the driver l-2 is changed due to the collision between the impact part 3 of the printing hammer and the projection 1. The dots are printed sequentially in columns along the feeding direction of the recording paper at a pitch of d in the order J shown, but are obscured by the portion 4 of the pitch d- of the dots 2 formed in the shaded area. Further, in the case of "2" in FIG. 14, the characters are printed sequentially in columns like "4", but the portions 4 of the pitch d- are formed at appropriate locations and become unclear.

Also, in the case of rAJ in FIG. 15, d portions 4 are formed at both corners of the upper end, making them unclear. Furthermore, in the case of rXJ shown in FIG. 16, d-sections 4 are formed at several locations at the intersection of medium flames, making them unclear. As described above, since the dot bit d' portion 4 is formed in the printed portion representing the diagonal line portion, the print quality is likely to be low, which tends to result in an unclear dot matrix.

[Object of the Invention 1] An object of the present invention is to provide an impact crossbar dot printer which eliminates the above-mentioned drawbacks and enables print display in highly dense areas.

[1llt Essentials of the Invention] The features of the present invention include a platen having a plurality of protrusions, a printing hammer arranged opposite to the platen and scanning in a direction perpendicular to the feeding direction of the recording paper, and a printing hammer provided at the tip of the printing hammer. In an impact/crossbar complete dot printer, the impact part of the printing hammer crosses and collides with the protrusions of the platen, and a plurality of skewed protrusions are formed on the platen to prevent diagonal lines in printing. This eliminates the problem of ambiguity in the direction, enables high-density print display, and improves print quality.

[Embodiments of the Invention] As shown in FIGS. 1 to 5, a carriage 11 is a non-magnetic light suspension material, and is slidably mounted on a pair of guide rails 13 installed on a side plate 12. It is set up. 1
Reference numeral 4 denotes a printing hammer, the end of which is provided in a cantilever shape on the key 1# ridge 11 via a pin 15. Reference numeral 16 denotes a plate-shaped impact portion, which is fixed to the tip of the printing hammer 14. 17 is an electric drive device for the printing hammer 14 that moves the magnet 17a and the movable coil 17b;
1 is provided. Reference numeral 18 denotes a platen, which is fixed to a platen shaft 18a pivoted on the side plate 12 in a position opposite to the printing hammer 14. Reference numeral 19 indicates a plurality of protrusions (12 in Fig. 3) formed on the outer circumferential surface of the platen 18, and the protrusions are set at an appropriate angle α to the axis of the platen 18 downward as the carriage 11 advances in the direction of movement.
(45 degrees in Figure 1 (A>).

20 degrees in Figure 1 (B), 30 If in Figure 1 (C)
f) Protrudingly formed with a skew. In that case, the inclination angle β of the printing hammer 14 in FIG.
The correction angle Δβ, that is, the angle for forming the dot array in the column direction straight parallel to the paper feeding direction of the recording paper 20, for example, 7 degrees, is added to the angle β=142 degrees, which is set to 35 degrees.
It is inclined at this β angle and intersects with the protrusion 19. 21 is a drive motor, and its output shaft 21a is fixed to a pair of gears 22 and a slit disk 23 shown in FIG. A gear 24 is fixed to the platen shaft 18a protruding from the side plate 12, and a reduction gear 25 is disposed between this gear 24 and the gear 22 of the output shaft 21a.

26 is a traction loaf 2 connected to the end of the carriage 11
1 through a pulley 29 against the force of a return spring 28, and is integrally formed with a gear 30.

Reference numeral 31 denotes a clutch that connects the gear 30 of the winding drum 26 and the gear A722 of the drive gear 21 via a reduction gear 25a, and the carriage 11 is scanned and returned by the quick disengagement action of this clutch 31.

Reference numeral 32 denotes a detector, through which the outer circumferential portion of the slit disk 23 is inserted so that the slit 23a is in relation to the opening thereof, and the output signal of the detector 32 is used to synchronize the printing operation. In that case, the detector 32 is provided with a light emitting element and a light receiving element (not shown) at a portion 1710. The number of slits 23a corresponds to the number of rows M of characters in the dot matrix of M rows and N columns, and is a multiple of (M+n). Reference numeral 11 indicates a play for transitioning from the bottom row to the top row of the next row, and at least one row is required. FIG. 5 shows the case of 7 rows, and 13 slits 23a are provided at equal pitches. Dot 3 is detected by the detection pulse by this detector 32.
The line position of 3 is detected. Figure 2.

Reference numeral 35 in FIG. 3 is an ink ribbon inserted between the impact portion 16 of the printing hammer 14 and the outer peripheral surface of the platen 18. Note that the scanning speed of the carriage 11 is the same as that of the platen 18.
It is related to the rotation speed of the motor and is set by the gear ratio.

Therefore, when the carriage 11 is at the home position at the left end of the guide rail 13 and the drive motor 21 is activated, its rotational force is transmitted to the gear 22, the reduction gear 25, and the gear 2.
The rotational force is sequentially transmitted to the gear 22, the reduction gear 25a1, the clutch 31, and the gear V730 to rotate the winding drum 26. The towing rope 27 is wound up and the carriage 11 is scanned from the home position to the right in FIG. As a result, the relative positional relationship between the protrusion 19 of the platen 18 and the impact portion 16 of the printing hammer 14 gradually changes diagonally, forming dot matrix characters.

Now, in the case of "4" in row 7 and column 5, in FIG. Then, as the carriage 11 moves and the platen 18 rotates, the protrusions 19 are sequentially moved (2), 3rd column, 2nd row (3), (4), 2nd column, 3rd row (5)
.

(6), 1 column, 4 rows (7), (8), 5 - column 5 rows < 9)
, (10) , 4'-column 6 rows (11) , <12)
, moves to column 3', row 7 (13) at a pitch of d'', and then the next protrusion 19 appears at the position of column 5, row 1 (1-), Sequentially (21, 4 columns, 2 rows (3-
), (4-).

3rd column, 3rd row (5,), (6-), 2nd column, 4th row (71, (81
, 1 column, 5 rows (9-), (10-), 5-column, 6 rows (11M
, (12-), 4-column 7f] (13-). In that case, the carriage 11 has a distance of 111110 while the platen 18 rotates 1/L (or the number of protrusions on the platen).
It is set to move by just one pitch (pitch between dots in the column direction). The detector 32 also outputs a pulse P (1)
.

A detection signal is generated in which P(2)...P(13) is one cycle, and pulses P(1>, P
(2)...P(13) is each platen 18
The protrusions 19 are (1), (11, (2), (2) in Fig. 7.
')...(13), corresponds to when located at (13-).

Therefore, pulses P(1), P(2)...P(13
), the impact portion 1G collides with the protrusion 19 by selectively applying a drive voltage to the movable coil 17b in synchronization with the movement coil 17b, and the dot matrix characters as shown in FIGS. 7 to 10 are printed on the recording paper 20. etc. are formed. When the required printing of one line is completed, a carriage turn signal is sent to the clutch 31.
Since the clutch 31 is in the disengaged state, the carriage 11 returns to its initial home position by the restoring force of the return spring 28. Also, clutch 3 is activated by the return signal.
1 becomes connected and the same operation as above is repeated 3.
In that case, the slit disk 23 is provided with a starting sulin 1~ (as shown in the figure).
) may be provided for synchronization. In the above embodiment, the drive source for the carriage 11 and the platen 18 is common, but they may be separated separately.

Further, the rotation direction of the platen 18 may be reversed. Further, the number of protrusions 19 on the platen 18 may be changed as appropriate. Further, as a means for selectively applying a drive voltage to the movable coil 17b, for example, a dot matrix pattern of characters and symbols corresponding to data sent from an electronic meter f'X IXII is stored in advance, and an appropriate drive control circuit using a microcomputer is used. It can be controlled by. Moreover, the pulse P is generated by the slit disk 23.
Although the noise is generated using the detector 32, it may be generated using a pure electric circuit using a timer or the like.

Therefore, as shown in FIG.
Because the platen 18 is rotated to print two dots 2 in FIG.
3 can be printed, for example "4" shown in Figure 7.
In the case of , dots are printed sequentially in the diagonal direction (45 degrees in Figure 7) at a pitch of d'' in the order shown in the numbers written in the driver 1, so the dot pitch in the row direction is the same as in Figure 13. d, but the pitch in the diagonal direction is the 13th d-
The diagonal line portion is formed by the d” pitch portion 34 and is printed with high density. In the case of "2" in FIG. 8, as in the case of "4" in FIG. 7, printing is performed sequentially in the diagonal line direction at a pitch of d", and the printing is performed with high density by the d" pitch portions 34 having high density. , In the case of rAJ in Fig. 9, printing is performed sequentially in the diagonal direction at a pitch of d'', so d is printed in part 4 of d at both upper corners of rAJ in Fig. 15.
A "pitch part 34" is formed and printed with high density. In rXJ in FIG. 10, the central intersection part is displayed with high density by the diagonally shaded part of the d" pitch part 34.

Further, there is an advantage that the horizontal 1] of the dot matrix of characters, symbols, etc. can be freely selected by changing the skew angle of the protrusion 19. For example, when the skew angle α of the protrusion 19 is 45 degrees as shown in Fig. 1(A), "2" becomes wider laterally as shown in Fig. 11(A>), whereas in Fig. 1(C) When the skew angle α is 30 degrees, the horizontal 11'' becomes wider than when α is 45 degrees.In addition, when the skew angle α is 30111, it is necessary to change the inclination angle of the printing hammer 14 as appropriate. By configuring the angle of the printing hammer 14 to be freely adjustable according to changes in skew, it is possible to attach the platen 18 having a protrusion 19 with a desired skew angle and to arrange the dots at an angle perpendicular to the protrusion 19. By adjusting the printing hammer 14 to an angle including a correction angle for forming the recording paper 20 straight and parallel to the paper feeding direction,
The horizontal tIJ of the hema matrix can be freely selected.

[Effects of the Invention] As described above, the present invention includes a platen having a plurality of protrusions;
The printing hammer is arranged opposite to the platen and scans in a direction perpendicular to the feeding direction of the recording paper, and an impact part is provided at the tip of the printing hammer, and the impact part of the printing hammer hits the protrusion of the platen. The impact of crossing and colliding
In the crossbar set dot printer, a plurality of skewed protrusions are formed on the platen, and the pitch d is approximately the same as the pitch d in the row direction of a conventional dot matrix.
'' dot pitch makes it possible to print dots sequentially in the diagonal direction, and as a result, dots can be printed in the diagonal direction with high density at a pitch d'', which is approximately 1/2 of the conventional dot pitch d' in the diagonal direction. This is to improve printing quality by solving the problem of ambiguity in the direction of diagonal lines.

[Brief explanation of the drawing]

Figures 1 (A), (B), and (C) are front views showing the state of the platen and printing hammer of the present invention, Figure 2 is an overall plan view of the apparatus of the present invention, and Figure 3 is A-- 4 is a front view showing the printing hammer, 5 is a front view of the slit disk,
FIG. 6 is an explanatory diagram showing the state of dot printing according to the present invention, FIGS. 7 to 10 are front views of the dot matrix according to the present invention, and FIG.
Figures 1 (A) and (B) are front views of the dot matrix corresponding to Figures 1 (A) and (C), Figure 12 is a clear view showing the conventional dot printing state, and Figures 13 to 16. is a front view corresponding to FIGS. 7 to 10 without showing the conventional dot matrix. 11...Killing ridge 14...Printing hammer 16...
・Impact part 18...Platen 19...Protrusion 20・
...Recording paper Figure 1 (A) 11/3 1B3 Figure 19 @ Figure 4 space ○ ○ ○ 0 0 00

Claims (1)

[Claims] The above-mentioned apparatus includes a platen having a plurality of protrusions, a printing hammer arranged opposite to the platen and scanning in a direction orthogonal to the feeding direction of the recording paper, and an impact part provided at the tip of the printing hammer. An impact crossbar complete dot printer in which the impact part of the printing hammer crosses and collides with the protrusion of the platen, characterized in that the platen has a plurality of skewed protrusions. .