JPS62198471A - Wire dot printer - Google Patents

Abstract

PURPOSE:To enable normal printing to be performed even where one or more of printing wires are broken, by a method wherein a printing head is moved upward or downward according to breakage information on the printing wires, a reprinting signal is generated, data necessary for reprinting is taken out, and is shiftedly transmitted to a normal one of the printing wires. CONSTITUTION:When one of a group of printing wires 21-27 is broken, a broken-wire number 10 is inputted to a controlling circuit 11, and normal printing for one line is performed. Rotation of a platen 7 is momentarily stopped by a signal 11c from the controlling circuit 11, and an AND gate 14 so functions that dot data to be transmtited to the broken printing wire is shiftedly transmitted to a normal one of the printing wires, based on a signal 11b. On the other hand, the controlling circuit 11 forms a signal 11a for moving a printing head 6 upward or downward by a one-dot amount, based on the broken-wire number 10. Under this condition, the head 6 is horizontally moved according to a printing signal 3a and a horizontal-movement signal 3b from the controlling circuit 11, and corrective overprinting of missing dots in the one line previously printed is performed for all of the relevant characters in the line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wire dot printer that prints in series by the impact of a group of printing wires.

[Conventional technology]

Figure @2 is a block diagram showing the configuration of this type of conventional wire dot printer. In the figure, (1) is an interface circuit that performs level conversion of control signals and data signals with a processor, etc.; (2) is a register circuit that holds print data, (81 [timing circuit for t printing, (4) is a wire drive circuit that drives the wire, (6) is a print head (6) t-head horizontal that drives in the horizontal direction Drive circuit, (γ) is a platen for loading printing paper, (8)
is a platen drive circuit that drives this platen (γ).

Figure 3 is a diagram showing the positional relationship between the print head and the print surface of this wire dot printer, with +211 to - indicating the print head (
6) Printing wire protruding from the surface, Hou) Printing paper that moves while being wound around the hub latin (7), and Rigidity indicates the printing surface plate, respectively.

The operation of the dot printer configured as described above is explained in the fourth section.
The explanation will be made with reference to the drawings and the print pattern diagram in FIG.

When data from a processor (not shown) is to be printed on the printing paper (to) loaded on the platen (a), the data (1b) level-converted by the interface circuit (1) is first transferred to the register circuit (2). ).

On the other hand, the print control signal (1a) whose level has been similarly converted by the interface circuit (1) is sent to the timing circuit (8).
).

As is well known, a dot printer prints by a combination of several dots in the vertical direction and several dots in the horizontal direction, as shown in Figure 4. For example, a character consisting of 7 dots vertically and 4 dots horizontally. For example, consider the case of printing the character "Japanese", and there is data corresponding to the dot O in FIG. 4.

In this case, the signal (3a) U from the timing circuit (8:
Of the data in the register circuit (2), all data corresponding to column A is selected and sent to the wire drive circuit (4).

The positions from No. 1 to No. 7 in the vertical direction in Fig. 4 are the print wires (
21) - (corresponding to each other. Therefore, at this timing of column A, the printing wires corresponding to the dots 1 to 7 of column A are driven, and the printing paper I2
Printing is performed by contacting the printing surface (2)) of 8).

Thereafter, a signal (3b) from the timing circuit (8) is supplied to the head horizontal drive circuit (5), which causes the print head (6) to move horizontally by one dot. Next, the signal (3a) from the timing circuit (8) is transmitted to the register (2).
) data corresponding to column B is selected and sent to the wire drive circuit (4). At this timing of column B, the wires fa*9! corresponding to dots 1, 4, and 7 of column B are connected. l@e (b) is pivoted, and the data in column B is printed in the same way as in column A. The above operation is also performed for the 0 column and the D column, and after repeating a total of 4 times, printing of the characters for "day" is completed.

Next, when the register circuit (2) finishes printing one line, at stage t, the signal (3C) from the timing circuit (3) is supplied to the platen drive circuit (8), and at the same time the printing paper is sent to the platen (7). (281, on the printing surface) Film; moves by one line.From this point on, printing continues in the same manner as described above while data to be printed and control signals are supplied from the processor or the like.

If a particular print wire is missing during these series of @h operations, dots will be missing in all the related print characters. FIG. 5 shows an example of printing when the fourth wire is missing, and since the 0 portion of the "day" that should be printed is not printed, it appears as "0".

[Problem that the invention seeks to solve]

Conventional wire dot printers are configured as described above, so if a particular printing wire in a group of printing wires is missing, the part corresponding to the missing printing wire becomes blank, resulting in insufficient characters. There was a problem with it being put away.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a wire dot printer that enables normal printing even when there is a missing wire.

[Means for solving problems]

In the wire dot printer according to the present invention, the first circuit means moves the print head up and down according to the print wire defect information.
t is moved downward, while the second circuit means generates a reprint signal, the third circuit means is used to extract only the data necessary for reprinting, and the circuit means of wc4 transmits it to the originally defective wire. The output of the fifth circuit means should be shifted and transmitted to the normal printing wire.

[Operation] In the present invention, the first circuit means moves the print head so that a normal printing wire is located at the position where the wire was missing, the second circuit means generates a reprint signal, and The data obtained through the third circuit means and necessary for the next printing is transmitted to the normal printing wire to perform reprinting, and the defective hot portion is corrected to obtain normal printing.

〔Example〕

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, in which the same reference numerals as in FIG. 2 are used to designate the same elements. αD other than these inputs the missing wire number information (hereinafter referred to as the missing wire number) aol and generates a signal for moving the head up and down (10a), a signal for shifting dot data and transmitting it to other wires (11b), and a signal for shifting the dot data to other wires (11b). A control circuit that outputs a signal (11c) that temporarily stops the rotation, and a signal (1a) for normal operation.
On the other hand, the signal when there is large input missing wire information (11c)
is the other input and the logical sum signal (12a) of both is added to the timing circuit (3). 181 is the print head (181) by the signal (11a) when there is missing wire information.
6) is a head vertical drive circuit that drives the circuit in the vertical direction, 4 is a signal (11b) when there is missing wire information, f is one input, and the other input is the data (2a)' of the register circuit (2), which is the logical product of both. This is an AND gate that supplies dot data that needs to be removed and reprinted to the wire drive circuit (4).

The operation of the nine embodiments configured as described above will be described below.

First, when data from a processor (not shown) or the like is printed on printing paper μs) loaded on a platen (γ),
The series of printing operations performed when no printing defects of specific dots are found in printed characters are exactly the same as in the conventional example.

Next, if any of the printing wire groups 1211 to 1271 in FIG. This shows an example of missing dots due to missing parts.

In order to obtain normal printing even if there is a defect in one of the printing wire groups, here we will introduce the control circuit 01).
Input the missing wire number Qoli.

Then, normal printing is performed for one line. Conventionally, at this point, the output (3C) from the timing circuit (3) would have caused the platen (γ) to rotate once, but in this case, the platen (A) would have been rotated by the signal (11c) from the control circuit C11). Pause. On the other hand, in the AND gate α signal, the dot data to be transmitted to the missing print wire is shifted and transmitted to the normal print wire by the signal (11b) from the control circuit α. Here, assuming that the defective wire is the fourth print wire, that is, print wire 4, the signal is transmitted to the normal print wire μs). Furthermore, in the AND gate α4), the signal (11b)
This prevents print data from being transmitted to anything other than the print wire μs).

On the other hand, the control circuit αη creates a false code (11a) for vertical movement of the print head (6) by one dot based on the contents of the missing wire number (to). In this case, when the missing wire number information is number 1, a signal is applied to the head vertical drive circuit (1B) to move the head vertically, and when it is numbers 2 to 7, it moves downward. To explain this using figure 9 t-84, if the 4th data is transmitted to the 3rd print wire) and the print head (6) is moved downward by t-1 dots, the originally required A column 4 It will be printed on the number dot. In this state, the print signal (3a
), the head (6) is driven horizontally by the horizontal movement signal (3b), thereby correcting and overprinting all the characters that were missing during the previous printing of one line. After the correction printing is completed, the overlap printing end signal (3c
) by rotating the platen (γ) t-. That is,
During normal operation, the print head (6) completes a one-way operation to print one line, but when specific wire loss information is input, it makes one round trip to print a - line and completes printing. By sniffing, a complete print of the negative part is obtained.

The above is the operation when the missing wire report is number 4,
If the missing wire number information is 2.3, 5, 6°7, the dot data will be the print wire 1, which is one above, as in the above case.
2, 4, 5.6 and is transmitted to move the print head downward.

However, only when the missing wire is the first wire (21), when the head (6) moves downward, there is no printing wire corresponding to the originally required printing surface, so the control circuit (9) A signal (11a) for moving the print head (6)'t-upward is output.

Also, AND game) (141 acts to transmit the data to be transmitted to the missing print wire (211) to the second print wire (2)) accordingly.

In the above embodiment, the correction overlap printing operation is configured to operate one by one for all characters in one line, but if a character unrelated to the missing wire is detected in advance, the character valve will jump, etc. By adding this function, the speed of corrected overlapping printing can be increased.

Furthermore, in this example, the structure of the character pattern is 7×4.
A dot wire dot printer is described, but the present invention is not limited thereto, and 16 wire% 2
It can also be applied to a 4-wire dot printer.

Friend, in the above embodiment, the case where there is one defective wire has been explained, but the effectiveness of the present invention can be easily inferred even when a plurality of wires are defective.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, even if six specific printing wires are missing, the data that should be transmitted to them is transmitted to the normal printing wires, and the wire loss occurs. Since the head is moved so that a normal printing wire is located in the correct position and the head is reprinted, normal printing can be obtained even after the defective printing wire is discovered until it is repaired or replaced. There is.

[Brief explanation of drawings]

@1 Figure is a block diagram showing the configuration of an embodiment of this invention.
Figure 2 is a block diagram showing the configuration of a conventional wire dot printer, Figure 3 is a diagram of the positional relationship between the print head and printing surface of this wire dot printer, and Figures 4 and 5 are diagrams of the printing pattern of this wire dot printer. be. (211-Register circuit (3)...Timing circuit (
4)・O-wire drive circuit (6)・-Print head (2)・・Control circuit ((2)
. . . OR gate Oll . . . Head vertical drive circuit (4) Fist ・AND gate ( 21 ) to (b) . . . Print wire Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] In a wire dot printer that has a print head in which multiple print wires are arranged vertically and prints in series,
a first circuit means for vertically moving the print head by at least one dot based on the missing information of the printing wire; a second circuit means for generating a reprint signal based on the missing information; and missing wire number information. a third circuit means for extracting only the data necessary for reprinting based on the above, and shifting the data of the third circuit means to the normal print wire that has been moved to the position of the defective print wire by the movement of the print head. and fourth circuit means for transmitting the information.