JPS6119376A - Printer - Google Patents

Abstract

PURPOSE:To enhance accuracy of printing positions and enhance printing quality in shadow printing, by providing a commanding means for commanding to printing data stored in the first line in a memory means storing a two-line amount of printing data and then to print, in the same line, printing data stored in the second line in the memory means, and a comparing means for comparing the printing data stored at corresponding positions of the first line and the second line in the memory means. CONSTITUTION:After the two-line amount of printing data a1, a2 are momentarily stored in a line buffer 20, the printing data for the first line are printed in a forward direction. When performing shadow printing, underlining or the like is to be conducted for the first line thus printed, a same-line command is outputted, and a command is outputted from a main controlling part 12a, whereby a comparing part 21 compares the corresponding printing data a1, a2 in the first line and the second line in the line buffer 20 on a character basis, the results of comparison are sent to the main controlling part 12a, and when the data thus compared are ''the same'', it is decided that shadow printing is to be conducted, and a command for printing in the forward direction is outputted. Accordingly, by conducting the shadow printing in the same direction as the preceding normal printing, the direction of positioning for printing and the direction of selecting types in the shadow printing are the same as in the preceding normal printing, so that accuracy of printing positions is enhanced, and printing quality is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to shadow printing in a serial printer device that performs type printing, and particularly to a printer device that can prevent splitting of shadow print and improve print quality. It is something.

In recent years, with the spread of various computer-applied devices, various printer devices have been developed and put into practical use, and serial printer devices that use a type wheel are used when particularly high printing quality is required.

In addition to normal printing, some of these serial printers are equipped with a function to perform shadow printing that emphasizes a specific printed area. There is a need for a method that does not cause this.

[Conventional technology]

4 is a perspective view showing the main parts of the serial printer, FIG. 5 is a control block diagram of FIG. 4, and FIGS. 6(a) and 6(b) are explanatory diagrams of FIG. 4. The same reference numerals indicate the same objects throughout the figures.

As shown in FIG. 4, printing paper 2 is set on the platen 1, and on the right side of the front surface of the platen 1 in FIG. The carrier 3 is also screwed into a feed screw 5 which is also provided parallel to the platen 1. Feed screw 5
is connected to the space pulse motor 7 (hereinafter S) via the belt 6 etc.
Therefore, the feed screw 6 moves the carrier 3 in the direction of arrow A in the figure by the forward and reverse rotation of the S motor 7.
, move in direction B.

The carrier 4 includes a rotation pulse motor (hereinafter referred to as R motor)8. and a hammer magnet 9, and a type wheel 10 is detachably attached to a motor shaft (not shown).

In the type wheel 10, type characters 10a are provided at the tips of radially formed arms, alternately arranged at equal pitches around the entire circumference. The hammer 9a of the hammer magnet 9 hits the uppermost type 1
It faces the back of 0a.

By energizing and de-energizing the hammer magnet 9, the hammer 9a can be moved in the directions of arrows C and D in the figure.

Next, in FIG. 5, the interface circuit 11 has a function of determining a series of input print information a and sending it to the main control section 12.

The main control unit 12 includes a line buffer that temporarily holds one line of print data and a printing sequence program, and input print information sent from the interface circuit 11.
Print position data b based on a.

Print data C, hammer drive signal d, and line feed data e
It has the function of sending out and controlling each part.

The space control circuit 13 receives input print position data b.
It has a function of controlling the movement of the type wheel 10 to the printing position by driving the S motor 7 based on the above.

The type selection control circuit 14 has a function of controlling type selection by driving the R motor 8 and rotating the type wheel 10 in the directions of arrows E and F in FIG. 4 based on the input print data C. .

Based on the input line feed data e, the line feed control circuit 15 rotates a line feed pulse motor (hereinafter referred to as LF motor) 17 and drives a feed mechanism (not shown) to move the printing paper 2 in the direction indicated by the arrow G in FIG. It has the function of transferring a predetermined amount in a direction.

Further, 16 indicates a hammer magnet drive circuit.

With such a configuration and function, the printing information 4TJa inputted from a computer etc. is transmitted to the interface circuit 1.
1 and sent to the main control unit 12, and print position data b is sent to the space control circuit 13 and printed on the type wheel 10.
moves to determine the print position, print data C is sent to the type selection control circuit I4, and when the type to be printed is selected, the print drive signal d is sent to the hammer magnet drive circuit 16.
The hammer magnet 9 is energized, and the hammer 9a collides with the printing paper 2 and the platen 1 from the back side via the ink ribbon (not shown), thereby printing on the printing paper 2.

When the hammer magnet 9 is de-energized, the hammer "9a retreats, and printing of one character is completed. Printing position data b, printing distance C, etc. for the next printing are sent out from the main control unit 12, and the printing is completed. The wheel 10 continues printing m while moving in the direction of arrow 8.

When printing for one line is completed, the line feed data e is sent to the line feed control port 15, and when the LF motor 17 rotates and feeds the printing paper 2 by the line feed feed amount, the printed printing paper 2 moves along the arrow G.
transported in the direction. Thus, the type wheel 10 continues printing while moving in the direction of arrow B.

Here, shadow printing may be performed to emphasize printed characters. As shown in FIG. 6, t and i+, a dark print can be obtained by printing the same print again with a slight shift and making the vertical line thicker.

In other words, when there is a character to be shadow printed in one line of print data C, the print data to be shadow printed on the same line is sent next to the one line of normal printing data, so after one line is finished. , by printing in the same line in the opposite direction at the same speed, the characters to be shadow printed are printed again at a position shifted by the shift amount S.

In this case, the straight star s has a dimension 1 which is slightly smaller than the width W of the line printed by the type 10a, for example, 1/120 inch (approximately 0.21 mm) corresponding to one step of the S motif.
) is set.

[Problem that the invention seeks to solve]

In the above conventional method, the width tS during shadow printing is set to about 0.21 mm as mentioned above, and the line width of the type varies depending on the type of type, but for example, 0.20 to
Since it is molded to 0.25 mm, even if the line width becomes a little thicker due to printing, the overlap of the print when shadow printing is extremely small, and there is also a difference in type selection pinch between forward printing and reverse printing.

Since the positioning accuracy of space feed and space feed varies due to mechanical errors of the device, there is a difference in shadow printing as shown in Fig. 6(b) for normal shadow printing shown by the broken line in Fig. There is a problem that the formation of a gap g is unavoidable.

[Means for solving problems]

The present invention includes a storage means for storing two lines of print data;
a command means for instructing to print the print data stored in the second line of the storage means on the same line after printing the print data stored in the first line of the storage means; and a storage means when instructed by the command means; and comparing means for comparing the print data stored in corresponding positions of the first line and the second line, and when at least one piece of the same print data exists as a result of the comparison by the comparison means, the print data of the second line This is a printer device that prints in the same printing direction as the first line print data, and prints in the opposite direction when the same print data is not available, thereby solving the above problem.

[Effect]

According to the present invention, instead of the conventional method of printing at the same speed in the forward and reverse directions, shadow printing is performed in the storage area of the first line of the storage means having a storage area for temporarily storing print data of two lines. The normal print data of the print data including the part to be printed is stored, the print data for shadow printing is stored in the storage area of the second line, and after the printing of the first line is finished, the same line printing is commanded. At this time, the comparison means compares the opposing print data on the first and second lines, and if they are the same character, the print control means transfers the corresponding print data stored on the second line to the first line. By printing in the same direction as the stored print data, it is possible to increase the printing position accuracy and improve the print quality of shadow printing.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a control block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of FIG. 1, and FIG. 3 is a flowchart of FIG. 1. The same reference numerals indicate the same objects throughout the figures.

In FIG. 1, the main control section 12a has the function of the main control section 12 described in the conventional example with the lines and buffers removed, and when a same line printing command is manually input,
A comparison command signal is sent to the comparison section 21, and the comparison result sent from the comparison section 21 is "difference".

When the “same” signal is “same”, the same direction printing and shadow printing commands are sent to the space control circuit 13;
It has a function of instructing the type selection control circuit 14 to select type by printing in the same direction.

As shown in FIG. 2, the line buffer 20 includes storage areas 20a and 20 for temporarily storing two lines of print data a for each line.
It is a memory method that allows you to remember b. The part indicated by the solid line in FIG. 2 is the first line print data al in the storage area 20a,
A state is shown in which the second line of print data a2 is stored in 0b.

When the main control unit 12a commands printing on the same line, the comparison unit 21 compares the print data a1. It is a comparison means for comparing +a2 and has a function of sending the comparison result to the main control section 12a.

Since the apparatus has such a configuration and function, a method for performing shadow printing will be explained with reference to the flowchart shown in FIG.

(2) First, when print data a is input to the interface circuit 11, two lines of print data al and a2 are temporarily stored in the line buffer 20, regardless of whether shadow printing is performed or not, and then output and printing is started.

For example, the print data of the first line is printed in the forward direction.

When there is no shadow printing in the print data aLa2, a line feed command causes a line break and the second line of print data is printed in the opposite direction.

■When it is necessary to print shadow printing or an underline on the first printed line, a same line command is issued, and based on this command, a command is issued from the main control unit 12a,
The comparison section 21 compares the opposing print data aLa2 of the first and second lines of the line buffer 20 character by character, and the comparison results are sent to the main control section 12. a, and if it is “different”, it is an underline, for example, so printing in the reverse direction is commanded, and “same”
In this case, it is determined that it is shadow printing, and forward printing is commanded to perform the respective printing.

By printing the shadow print from the same direction in this manner, the print positioning direction and the character selection direction become the same, thereby increasing the accuracy of the print position. Therefore, the variation in the amount of shift S is reduced, a split state is prevented, and printing quality can be improved.

↓The example explained the case where the printing speeds of normal printing and shadow printing are the same, but by making the printing speed of shadow printing slower than the printing speed of normal printing, it is possible to improve the printing positioning and mechanical part during type selection. It is possible to further improve the quality of shadow printing by reducing printing position errors caused by vibrations and the like.

Although the present invention has been described in the case of shadow printing, the same characters are printed in the same line and at the same position in an overlapping manner.

A similar effect can be obtained when applied to so-called "bold printing".

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to prevent the split phenomenon of shadow printing, and the printing quality can be improved.

[Brief explanation of drawings]

FIG. 1 is a control block diagram showing an embodiment according to the present invention, FIG. 2 is an explanatory diagram of FIG. 1, FIG. 3 is a flowchart of FIG. 1, and FIG. 4 is a main part of a serial printer explaining a conventional method. Fig. 5 is a control block diagram of Fig. 4;
. Figure 6 fal and (bl are explanatory diagrams of Figure 4. In the figure, l is the platen, 2 is the printing paper, 3 is the carrier, 7 is the S motor, 8 is the R motor, 9 is the hammer magnet, and 10 is the Type wheel, 10a1 is the type, 11 is the interface circuit, 12.128 is the main control section, 13 is the space circuit, 14 is the type selection control circuit, 15 is the line feed control circuit, 16
2] is a hammer magnet drive circuit, 20 is a line bumper, and 2] is a comparison section. 'I# wo iz) Koto 2 呵 v-5 song #bt: 1

Claims (1)

[Claims] In an apparatus that includes a platen member and a printing unit including a type wheel facing the platen member, and prints on a printing medium set on the platen member while moving the printing unit, printing data for two lines is printed. A storage means for storing, a command means for instructing to print the print data stored in the second line of the storage means on the same line after printing the print data stored in the first line of the storage means, and the command means and a comparison means for comparing the print data stored in the corresponding positions of the first and second lines of the storage means when instructed by the above, and as a result of the comparison by the comparison means, at least one piece of the same print data is found. A printer device characterized in that when the second line of print data exists, it prints in the same printing direction as the first line of print data, and when the same print data does not exist, it prints in the opposite direction.