JPS5952678A - Apparatus for detecting abnormality of printing apparatus - Google Patents

Abstract

PURPOSE:To prevent error printing, in a printing apparatus such as an impact line printer, by detecting whether the address of character code memory is read or not in predetermined order. CONSTITUTION:When printing scanning comprising five sub-scannings is performed at every one character pitch movement and the comparison of a character code of every fifth number and printing data of every sixth figure is performed during a sub-scanning period, the output of a code address counter 5 is coincided in lower rank two bits in each sub-scanning. Therefore, lower rank two bits of the value of a character position counter 4 loaded to a flag counter 24 by a clock pulse generator 25 generating one pulse in starting sub-scanning and lower rank two bits of the code address counter 5 loaded by the character mark signal in the sub-scanning are compared by a comparator 26 to make it possible to prevent error printing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an abnormality detection device for preventing printing errors in an impact line printer tongue printing device.

Print position IPf: For printing devices that use a type carrier such as a live τ band that continuously runs across k, as shown in Figure 'a1, the :r-doke of the type on the type band 1 is stored in the type code memory ( 6 and 1 line of print data are compared with the print code and print data of 75 print data memory (hereinafter referred to as PT, M) 9 by comparator 7, and if they match,・・Place the driver 10 in the ft-L. Corresponding digit mark "r hammer 3
Drive and print. The address of 00M6 is:
The instructions are provided by a sensor 2 for detecting type marks on the type band 1, a type position counter (hereinafter referred to as CPC) 4, and a code address counter (hereinafter referred to as OAO) 5;
Directed by.

With such a printing device, if the output values of the CCM 6 or PDM 9 become abnormal, erroneous printing will occur. For this reason, it is common practice to perform all parity checks on these outputs to detect whether or not they are abnormal.

(If there is an abnormality in the above (j T' (j 4, OAO 5 or PDM counter 8, etc.)
There was a drawback that a parity check error did not occur, erroneous printing occurred, and 'C could not be checked.

The purpose of non-invention is to eliminate the drawbacks of the prior art described in L,
a t' c or O that indicates the address of the OCM.
The object of the present invention is to detect an abnormality in an OOM address caused by an AO error 7, thereby preventing erroneous printing.

In the present invention, the COM addresses read in each sub-scan of each print scan for printing are determined in a predetermined order (μ(
, rule), it is possible to detect whether or not the CCM addresses are read out in a predetermined order.

The present invention will be explained below with reference to embodiment drawings.

First, a printing method of a printing device to which the present invention is applied will be briefly described.

FIG. 2 shows the facing relationship between the type characters on the type band 1 and the printing hammer 6. The printing type and the printing hammer 3 do not have a one-to-one correspondence, but approximately a five-to-six correspondence. For this reason,
For each character pitch movement, a print scan consisting of five sub-scans is performed, and during the sub-scan period, a comparison is made between every fourth character code and every five digits of print data. The {h and type positions where comparisons are made in scanning are shown together. In addition, if one digit is 136 digits and the character type on type band 1 is 64 character types, and the position of the type opposite to the first digit printing mark 3 in sub-scan 1 is set to 1, the type position is shown in parentheses. Shown below. Also, all digits and character positions are read out in regular order according to the direction of the arrow.

As is clear from the above, the character positions in each sub-scan are always read out in a predetermined order and are the same. Therefore,
OCM caused by CPC and OAO errors can be detected by monitoring whether or not the print positions are read in the above order.
address anomalies can be detected.

In other words, if the print code corresponding to print position 1 in a certain print scan is stored at the address n = 1 of 00M6, the readout code in each sub-scan is
The address of OM6, ie, the count value of 0AO5, is as shown in the following table.

Therefore, by monitoring whether the lower two pits 'f of the CAC3 count value match each sub-scan,
01" 04 or (!AO5 errors can be detected.

FIG. 6 is a diagram showing an embodiment of the present invention (7). Signal O
HA RM RK 1 is a pulse signal generated when the sensor 2 loads a type mark, and a signal CI (AFjM
IRK2 is a signal obtained by delaying the type mark signal CHARMRKl; signal 5TART MRK is a start mark signal generated when a start mark (not shown) provided at the beginning of a group of type characters on the type band 1 is detected;
The signal GS 5TART is set to 1 each at the start of each sub-scan.
This is a pulse signal generated from individual sources. The 0PO4 uses the signals CHARMRKl and S'rAR'r MRK as a clock input and a clear input, respectively. 0AO5 is the CPC! A count value of 4 is loaded at the timing of generation of the signals CHARMRK2 and BSSTART. In addition, 0AO5 determines the 4-up clock generator 21 which generates 4 pulses at each readout to read every 4th address of 00M, and the readout address at the start of each sub-scanning except sub-scanning 1. The respective outputs of the clock generator 22 are used as clock inputs via an OR gate 2. The clock generator 22 is
As shown in the timing diagram of FIG. 4, 1, 2, 3 and 4 pulses are output at the start of sub-scanning 2 to sub-scanning 5, respectively. 0P at the generation timing of the signal CHARMRK2
The flag counter 24, to which the count value of O4 is loaded, receives the output of the clock generator 25, which generates one pulse at the start of each sub-scan except sub-scan 1, as a clock input. Therefore, the count value of the flag counter 24 becomes the same value in the middle of each sub-scan. The flag counter 24 and the lower two bits of the count value of OA(,!5) are added to a comparator 26 and compared.

That is, the comparator 26 generates an output of logical value 1 when these lower two bits match, and outputs an abnormal signal of logical value O when they do not match.

The output of the comparator 26 is applied to the AND gate 27 together with the output of the comparator 7, and when an abnormal signal is generated, the gate of the AND gate 27 is closed and the drive signal HAMMER8FjT is prohibited from being sent to the Hammerton Eve 10.

Note that 29 is a 5-up clock generator that applies 5 clock pulses each to the PDM counter 8 in order to read out every 45 pieces of the PDM 9 during print scanning.

As is clear from the above configuration, the comparator 2 receives the counter value t of OAC which indicates the address of OCXI/+.
If there is an abnormality in the OPC 4 or OA O5, an abnormality signal is output from the comparator 26, so that printing errors can be prevented.

In the embodiment described in -h, the lower 2 bits of the count value of CAC3 are monitored, but of course only the lower 1 bit may be monitored. In other words, although the detection accuracy is slightly lowered, there is virtually no problem in practice, and the effect is that the configuration becomes simpler.

As described above, according to the present invention, it becomes possible to quickly detect the remaining seats at the read address 00M, and it becomes possible to prevent erroneous printing due to address abnormality.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a printing device to which the present invention is applied, and FIG. 2 is an explanatory diagram showing the facing relationship between a printing handle and type on a type band. FIG. 6 is a T-hook diagram showing an embodiment of the apparatus of the present invention, and FIG. 4 is a time chart for explaining the operation of FIG. 3. In the figure, 1 is a type band, ro is a print knob, 4 is OPC, 5 is 0AC16, 16 is OOM. 7.26 is a comparator, 8 is a PDM counter, 9 is a PDM,
2i is a 4-up clock generator, 22 and 25 are clock generators, and 24 is a jig/J counter.

Claims (1)

[Claims] 1. A type carrier that continuously travels across the printing position;
Opposed to the type carrier [2, printing hammers arranged in line along the printing 11' r decoy and accessed by an address counter, a character code corresponding to the type on the front type character carrier is read. Compare the printed code and print data of the printed code storage means and printed data storage means with the printed code storage means and the printed data storage means accessed by the counter and stored in the print data 7-11 which stores the notations to be printed. and a comparing means for generating an output for driving the printing hammer of the corresponding digit when the two characters match, and comparing and printing each time the second character moves.・
)Print scan-f is divided into multiple sub-scans, and each sub-scan 1 (14r) print data of fixed digits and the type code of a specific position are printed.
In the printing device 6 which performs reading and comparison printing, the lower number pits of the address counter are monitored for each sub-scanning 1, and pits that do not match occur in each sub-scanning 1.
．． An abnormality detection device characterized in that it is provided with a detection means that generates a normal signal when the address counter is activated.
The type mark on the sending body and the star I indicating the beginning of the type group.
A type position 16 counter which uses the type mark signal and start mark signal generated when a mark is detected as clock input and clear input, respectively, and the count value of the type position counter delays the type mark signal (IT number or One tie of the signal generated at the start of each sub-runner,
, '/g can be reloaded, and a code address counter/'nno which uses a predetermined number of pulses indicating the position of printed characters to be read out in each sub-scanning as a clock is used. 3. An abnormality detection device for a printing device according to claim 1. 3. The inspection means is loaded with the count value of the type position counter at the timing of the delayed signal of the type mark signal, A flag counter that counts the signal generated at the start of each sub-scan, and the lower several bits of the respective count values of the flag counter and the code address counter ?I: Ratio axis 1~, generates an abnormal signal when they do not match. A patent publication 1, characterized in that it also consists of a comparison means for making a comparison.