JPH0655503B2 - Printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is a printer for a line printer, which is capable of easily obtaining a print timing signal by using a management table without calculating it by a complicated calculation. In particular, the present invention is intended to correct printing fluctuation factors such as a slow frequency fluctuation of a power source with a simple configuration.

For example, in a line printer in which a type running body such as a type belt is run and the number of printing digits for one line is prepared and a type is selectively ejected to perform printing, a normal type running body is used. A mark corresponding to the print type is read by a sensor such as a magnetic sensor or a photo sensor in proximity to the mark, and the mark is collated with the print data stored in the memory, and if there is a match, the hammer magnet is excited. Print by operating the hammer. In this case, the code corresponding to each type and the code in the memory must be collated, which complicates the control method.

In the line printer, as shown in FIG. 3, the characters A, B, C, D, ...
...) is that when the letter A corresponds to the hammer, the letter E corresponds to the hammer,
When the type A is printed by the hammer, the next type printed by the hammer is the type B. That is, 6 printing hammers correspond to 5 type characters, and when the first-digit hammer opposes the type A first, the next opposing position is the 6th-type character E.
Therefore, in the state shown in FIG. 3, the letters A, E, ... Corresponding to the hammer, ... Can be printed.
In the sub-scan 1 of the print scan 1 shown in FIG. 9A, the respective digits of the hammer, ... Are printed.
During this period, the type traveling body V travels by d in FIG. 3, so that in the next sub-scan 2, the type letters B, F, ... Can be printed for the hammers ,. Can be printed. When the sub-scan 5 is performed in this manner, the type traveling body V
Runs only D in FIG. 3, and this time type B corresponds to the hammer, and type F corresponds to the hammer. Therefore, as shown in FIG. The numeral 8) in FIG. 3 and the type F (numeral 12 in FIG. 3) can be printed with a hammer, .... And the relationship between them is shown in Fig. 4 (b),
It is a figure shown in (c). Here, the type A shown in FIG.
The numbers 7, 8, 9 ... Described above B, C ... are character numbers.

In FIG. 4 (b), the numbers 1, 2 ...
Corresponds to a hammer, ...
It indicates that the hammer of the digit of the number shown in the section can be printed. In FIG. 4C, the numbers 7, 8, 9 ... In the items of each sub-scan indicate the letters A, B, C ... As shown in FIG. (C) shows that the print characters A, E, ... Can be printed during the sub scan 1 of the print scan 1, and the print characters B, F, ... Can be printed during the sub scan 2.

The hammer excited for printing is shown in Fig. 4 (a).
As shown in, the sub-scan is turned off after 7 cycles.
Therefore, as shown in FIG. 4B, the hammers that can be excited during the sub scan 1 are turned off in the sub scan 3 of the next print scan.

As described above, the excited hammer is turned off after 7 cycles in the sub-scan, so the hammer excited in the sub-scan 1 is turned off at the beginning of the sub-scan 3 of the next print scan. Stop AD of sub-scan 3 in FIG.
, 1, ... Show this state.

Of course, when returning from the last address of the sub-scan to the first address of the next sub-scan, see Fig. 4 (b) and (c).
It returns to a predetermined address like.

[Conventional technology]

Since such a printer has regularity as shown in FIGS. 4 (b) and 4 (c), these control sequences are held in the memory in advance, and this is used to save the hardware configuration. The applicant of the present patent application filed as Japanese Patent Application No. 57-231951.

FIG. 5 shows a printing control method according to the application, FIG. 6 is a concrete explanatory view of the control table, and FIG. 7 is a concrete explanatory view of the print data memory.

In FIG. 5, reference numeral 21 is an address counter, an initial address is set by a signal 30, and a clock 31 is applied. The control table 22 is filled with the table shown in FIG. 6 and is composed of, for example, a ROM.

In this control table 22, for example, the magnet set address is written in page 1, the magnet reset address is written in page 2, the code memory address (1) is written in page 3, and the code memory address is written in page 4. Address (2) is filled in, page 5 is filled with code memory address (3) and page 6 is filled with code memory address (4). In this magnet set address, as shown in FIG. 4 (b), printable information of each hammer indicating which of the hammers, ... Is capable of printing on each sub-scan 1, 2 ... Is entered.

At the code memory address (1) of page 3, a print for indicating which characters of the type of the type running body shown in FIG. 4 (c) can be printed in the sub-scans 1 to 5 is printed. The character numbers of possible characters are entered.

The first character number of each sub-scan is entered in the code memory address (2) of page 4, and the content corresponding to the input address output from the code memory address section 27 is “input address + 1”. The content is written. That is, the code memory address (2) is +1
Function as a soft counter.

At code memory address (3) of page 5, subscan 5 to subscan 1 of the next print scan cycle
The first print address of is written. The return address from each sub-scan is written in the code memory address (4), the print scan 1 is composed of the sub-scans 1 to 5, and the type number is the fourth as shown in FIG. It is read in synchronization with the reading in FIG. Then, when the scan from the first 7 ... to the end of the sub-scan 1 indicates that the first character number to the next sub-scan 2, that is, the return address, is 8 (that is, the character B), the sub-scan 2 It is entered that the return address 9 is from the end to the next sub-scan 3.

Reference numeral 23 is an address register in which an address for accessing the print data memory 24 is set. And this address is the control table 2 shown in FIG.
The magnet set address and reset address of 2 are entered.

The print data memory 24 is set with print information indicating characters to be printed for all the digits of at least one line, and is entered for each digit, that is, for each hammer. Therefore, when the address register 23 outputs the addresses 1, 6, 11, ... In the sub-scan 1, the character codes (for example, A, B, ...
・ The code corresponding to is output.

Reference numeral 25 is a comparator for checking whether or not the character code output from the print data memory 24 and the character code output from the code memory 28, which will be described later, match, and if they match, the corresponding hammer The set signal SET9 for exciting the
Will flag some of the

Reference numeral 26 is a secreter, which outputs an address for accessing the control table 22.

The print data is stored in the print data memory 24 from the host device, and the print cycle is executed when the print command is notified. Further, when the printing cycle is not executed, the type running body is running for a certain period of time. For this reason, it is necessary to always know the position of the printed character traveling body.

Reference numeral 27 is a code memory address section, in which an address for accessing the code memory 28 is written.

The contents of the code memory address portion 27 are selectively included in the code memory addresses (1), (3) and (4) of the control table 22 shown in FIG. 6 including the operation of the soft counter during the printing cycle. Is set to. When the print cycle is not executed (the signal 46 is inhibited by the AND gate 53 during the execution of the print cycle)
A pulse (hereinafter referred to as a type pulse) 45 corresponding to a type on the type traveling body is input to the code memory address section 27 through the OR gate 54, and page 4 of the control table 22.
The output of the code memory address (2) of is set. Then, it is reset by the reset signal 39. Further, the output signal 44 of the code memory / address unit 27 is input via 43 of the selector 26. At this time, the input signal of the selector 26 is switched to the 43 side by the select signal 32 and is input to it.

At this time, the fourth page of the control table 22 is selected by the page designation signal 33, and the content of the output signal 44 + 1 of the code memory address section 27 is accessed. In this way, when the printing cycle is not executed, the code memory address section 27 is incremented by +1 by the type pulse 45. Further, when the set of characters on the character traveling body reaches a set break, the signal 39 resets the address of the code memory address unit 27.

In the print cycle, print data for at least one digit of each hammer, ... Is set in the print data area of page 1 of the print data memory 24.

(B) When the print cycle starts, the address counter 2
1 is reset by signal 30 to all zeros. At this time, the selector 26 outputs the signal 42 according to the selector switching signal 32.
The side is selected, and thereby the control table 22 is accessed. The magnet set address of pages 1 and 2 in FIG. 6 is first output by the address of all zeros and the page selection signal 33, which is the set signal 35.
Is set in the address register 23. The output of the address register 23 accesses the print data memory 24 in which page 1 in FIG. 7 is selected by the signal 36, and the address of the hammer that can be printed in the sub-scan 1 is read out and printed. Output the character code that should be output.

(B) Next, the page selection signal 33 outputs the code memory address (1) of page 3 of the control table 22, and this is set in the code memory address section 27 by the set timing signal passing through the OR gate 54. .
(However, the value is not set at the beginning of the print cycle.) Then, the character codes 7, 11 ... Which can be printed by the sub scan 1 of the print scan 1 are output from the code memory 28. Thus, in the comparator 5, the character code to be printed corresponding to the hammer and the character code 7, the character code corresponding to the hammer and the character code 9 ... Are compared, and the matched ones are output to the register 48, The set signal 29 and the output of the print data memory 24 are temporarily stored. The set signal 29 is output to the hammer drive circuit to perform printing. By the way, this coincidence signal set in the register 48 is output by the write signal 49 via the buffer 50, and indicates which hammer was able to print in the control area of the print data memory 24 in page 2 of FIG. Remember the flag. The information in this control area is used for the following purposes.

That is, in the main scan 7 of FIG. 4 (a), the excitation at the n-th digit is performed on the hammers, ... Although the same timing exists in the main scan 8, the set signal 29 output in the previous main scan 7 at that timing sets the flag (A flag) in the control area of the print data memory 24 via the register 28 as described above. Since it is being done, judge the contents,
The set signal 29 is prevented from being output again, and the contents of the set signal 29 set in the control area are output to the register 48 in order to reset the excitation signal. Therefore, this signal is stored again in the control area as the B flag, and the reset pulse is output only when the B flag is turned on at the reset timing. When the A flag is read and written as the B flag, the print end flag C
The flag is written at the same time so that the next collation is not performed.

(C) In this way, after the prints that have been verified in the sub-scan 1 are printed, the print verification of the hammers, ... Is performed in the sub-scan 2, and only the prints that have been verified are printed. In this way, when the sub-scan 5 is performed and only the collated print is printed, the next print scan 2 is started. In this print scan 2, the character addresses 8, 12, ... Correspond to the hammer, ...
Some of the characters that could not be matched in the sub scan 1 of the previous print scan 1
The collation is obtained in the sub-scan 1 of. If the collation cannot be obtained even in this case, the hammers, ... Correspond to the character addresses 9, 13, ... In the sub-scan 1 of the print scan 3 (not shown). In this way, all print data can be printed when the print scan is passed through the character type of the character carrier V in FIG.

In this way, the desired printing can be performed by the sequence shown in FIGS. 2B and 2C.

[Problems to be solved by the invention]

By the way, generally, in a character belt type line printer, a type drum type line printer, etc., an electric motor driving a character conveyer is controlled by a means such as a DC motor for servo control unless the number of revolutions is specially controlled. Unless otherwise, the number of rotations varies depending on the power supply frequency, power supply voltage, printing load, etc.

That is, as shown in FIG. 8, when the type conveyor 65 is rotated by the pulley 61 driven by the electric motor 60, the type position detector 63 detects the character position display protrusion 62 and outputs a type pulse. When the collation of the printing is started by the clock pulse corresponding to the above, that is, the printing clock, if the speed of the electric motor 60 is changed, the timing at which the printing hammer 64 collides with the printing is deviated. Further, the dummy in the collation cycle described later also has a time lag unless it is set to a value corresponding to the speed fluctuation.

This shift will be described. The standard speed of the print carrier is V
_N , V'when the speed of the print carrier fluctuates,
Assuming that the time from the excitation of the print hammer magnet to the collision of the print hammer with the print carrier is T and the gap between the print carrier and the print hammer is X, the relationship shown in FIG. 9 is obtained. If the speed fluctuation rate is α, then V ′ = α
It becomes V _N. Incidentally, in the case T 'is the speed of print carrier is V' time to print hammer when it collides with the print carrier beyond the gap X, [Delta] T is the rate of V _N in Figure 9, V ' Is the difference in time for the print hammer to fly through the gap X at.

Now, when the speed is V _N , the print hammer is excited at the 0 point in FIG. 9 and the print hammer collides with the printed characters after the time T. Therefore, the expression (1) is established.

X = V _N T (1) When the speed of the print carrier fluctuates to V _N ′,
The following relationship is established when the speed fluctuation rate is α.

By the way, since T has a unique value depending on the magnet, if the speed fluctuation rate α can be detected, if the timing of exciting the print hammer is advanced by ΔT time obtained by this, the print hammer collides with the print carrier at time T. As a result, accurate printing can be performed. The reverse relationship occurs when the speed of the print carrier increases.

Similarly, as the speed of the print carrier fluctuates, the dummy time between matching cycles must also change. The normal collation cycle is performed as shown in FIG. Type clock P
Collation for sub-scans 1 to 5 must be performed between _{1 and} P ₂ . This matching time is shown as T _{1 to} T _{5 in} FIG. 8, and t _{1 to} t ₅ are surplus time called dummy time, and T ₀ − (T ₁ + T ₂ + T ₃ + T ₄ + T ₄ ).
₅ ) The time is averaged. During this dummy time t _{1 to} t ₅ , the speed of the print carrier changes and the print cycle T
_{If 0} fluctuates, naturally, there is a problem that the timing of collation is shifted unless it is increased or decreased.

Further, as another collation timing control method, as shown in FIG. 11, the collation timings T ₁ ′ to T ₅ ′ are provided in the print cycle T ₀ without dummy time, and when each row is composed of 136 digits, each digit is used. The matching time of And constructing T ₁ ′ to T ₅ ′ by 136 × Δt,
There is also a method of making this Δt variable according to the change of the cycle T ₀ , but since the matching time is configured by Δt of a very small cycle and this cycle is changed, the frequency of the basic clock becomes high. However, there are problems that control is difficult in a microcomputer, for example, and the circuit becomes complicated.

[Means for solving problems]

The present invention provides a printing apparatus capable of preventing a print deviation from occurring on a printed character carrier due to a gentle speed fluctuation caused by, for example, a speed change of an electric motor due to a slight frequency fluctuation, by a very simple means. For this reason, in the printing apparatus of the present invention, a printing belt having print characters arranged at a predetermined interval and a print hammer arranged at an interval different from the above interval are provided, and the print characters and the print characters are provided. A magnet set address area for holding the print hammer number information facing the hammer, a magnet reset address area for holding timing information for resetting the energized print hammer, and character number information of characters printable by the print hammer. Has a code memory address area (1) for holding A control table 3 in which each of the areas is selected, an address register 4 for holding information on a print hammer position that can be printed when the type belt is running, and information to be held by the address register 4 should be accessed for printing. A print data memory 5 for storing a character code of a character corresponding to the position of the print hammer, a code memory / address unit 8 having character number information of the printable characters, an output from an address counter 1, and the code memory Selector 2 for selectively outputting any one of the output from the address section 8 to the control table 3 and the character number information held in the code memory / address section 8 are accessed to correspond to the character number information of the printed characters. A code memory 9 for holding a print code and the print data memory 5
The print code output from the code memory 9 is compared with the print code output from the code memory 9 read by the information held in the code memory / address section 8, and when a match is found, the print hammer excitation signal In the printing apparatus including the comparator 6 that outputs the coincidence signal, the average value calculation unit 7 that calculates the average value of the speed fluctuations of the type belt and the control table 3 are provided. Data storage for correction holding a collation start adjustment time which is a timing adjustment time for determining and controlling the start timing of the first sub-scan of the print scan cycle and a dummy time for adjusting the time between the sub-scans according to the speed fluctuation The area 3-1 and the address for accessing the control table 3 are output, and the output of the average value calculator 7 is input / output. From the counter 1, the delay timer 10 in which the collation start adjustment time obtained from the correction data storage area 3-1 is set based on the average value, and the correction data storage area 3-1 based on the average value. Dummy timer 11 in which the obtained dummy time is set
Based on setting the average value of the speed fluctuations of the printing belt obtained by the average value calculation unit 7 in the address counter 1, the correction data storage area 3-1 is accessed to check the adjustment start adjustment time. For controlling the delay timer 10 to obtain the dummy time and the dummy timer 1
1 is controlled, the first sub-scan is performed by the output of the delay timer 10, and the next sub-scan is performed by the output of the dummy timer 11.

[Action]

Accordingly, in the present invention, when the speed of the printed character carrier fluctuates, the correction data for the print timing correction stored on the basis of the output of the average value calculation unit is stored in the memory so that the fluctuation does not affect the printing. The print timing can be controlled by reading it out, and the dummy time of the collation cycle can be corrected to a value corresponding to this speed fluctuation, so that the print deviation can be corrected very easily.

〔Example〕

An outline of the present invention will be given prior to a detailed description based on an embodiment.

In the present invention, correction data corresponding to the rate of change in speed, that is, how much the print start time should be corrected according to the degree of change in the speed of the print carrier, is prepared in advance as a table. When printing, a plurality of printing pulses, for example, several tens
Individually read and calculate the speed fluctuation rate from this, and based on this, find the optimum correction data according to the fluctuation at that time, and adjust the collation start time and dummy time based on this to adjust the speed fluctuation of the print carrier. Even if there is, it can be printed accurately.

An embodiment of the present invention will be described in detail with reference to FIGS.

FIG. 1 (A) is a configuration diagram of an embodiment of the present invention, FIG. 1 (B) is an operation explanation time chart thereof, and FIG. 1 (C) is a state relationship explanation diagram of each part of steps S13 to S21 in the sub-scan, FIG. 2 is an explanatory diagram of the operation.

In the figure, 1 is an address counter, 2 is a selector, 3 is a control table, 4 is an address register, 5 is a print data memory, 6 is a comparator, 7 is an average value circuit, 8 is a code memory address section, 9 is a code memory, 10 is a delay,
Timer, 11 is a dummy timer, 12 is an OR gate,
13 is an AND gate.

The address counter 1 corresponds to the address counter 21 in FIG. 5 and performs the same operation. However, in the present invention, it also operates as a register for temporarily setting the output of the average value circuit 7 described later. .

The selector 2 selects the output of the address counter 1 or the code memory address unit 8 and performs the same operation corresponding to the selector 26 in FIG.

The control table 3 is similar to the control table 22 in FIG. 5, and includes a magnet set address (verification address), a magnet reset address (stop address), a code memory, as shown in pages 1 to 6 shown in FIG. The correction data storage unit 3-1 is provided outside the addresses (1), (2), (3), and (4). This correction data storage unit 3-1
In the column, the collation start adjustment time ΔT (calculated by the above formula (3)) and the dummy time, which are calculated in advance in accordance with various speed fluctuation rates of the print carrier, are stored. Then, when the speed variation rate output from the average value circuit 7 described later is transmitted, the matching start adjustment time and the dummy time corresponding thereto are output, and the matching start adjustment time is set in the delay timer 10 and the dummy time is set. Is set in the dummy timer 11.

The address register 4 corresponds to the address register 23 in FIG. 5, and the address for accessing the print data memory 5 is set.
And this address is the control table 22 shown in FIG.
The magnet set address of is written.

The print data memory 5 stores the print data shown in FIG.
It corresponds to the memory 24, has a page structure as shown in FIG. 7, and is set with print characters for all the digits of at least one line.
... (see Fig. 3) is filled in. Therefore, when the addresses 1, 6, 11, ... Are output from the address register 4 in the sub-scan 1, the character code set at that address is output accordingly.

The comparator 6 corresponds to the comparator 25 in FIG. 5, and includes a character code output from the print data memory 5 and
It is checked whether or not the character codes output from the code memory 9 to be described later match, and if they match, a signal instructing the excitation of the corresponding hammer is output.

The average value circuit 7 is for detecting the speed fluctuation of the character carrier, and continuously receives, for example, about 30 character pulses output from the character position detector 63 shown in FIG. The value is calculated and the speed variation rate is output. In the average value circuit 7, for example, the number of reference clocks in the period in which the specified number of the type pulse is detected is added,
The speed fluctuation rate can be calculated by comparing it with the reference clock number when the type traveling body travels at the standard speed. The average value circuit 7 operates while the type traveling body is running, and detects the speed fluctuation and calculates the speed fluctuation rate even during printing by hammer stamping. It is possible to take the average of 1 to 30 type pulses, then take the average of 31 to 60 pulses, or first take the average of 1 to 30 pulses and then take the average of 2 to 31 pulses. The latter is preferable because the average value of the cycles at that time is continuously obtained.

The average value circuit 7 acts as a buffer against momentary fluctuations in order to average the periods of a plurality of print pulses as described above, but is designed to give a response suitable for the running system of the type conveying body. There is a need to.

The code memory address section 8 corresponds to the code memory address section 27 in FIG. 5, and the address for accessing the code memory 9 is written therein.
The address for accessing this code memory 9 is
In the print cycle, the code memory address of the control table 3 (see FIG. 6) is selectively set. Since the print signal applied to the gate 13 is "0" except during the printing cycle, the type clock (PSE) is OR gate 1
It is input to the code memory / address section 8 via 2 and the output of the control table 4 is set. At this time, the selector 2 is controlled by the selection signal so as to output the signal on the side of the code memory / address unit 8, so that the code memory / address unit 8 is incremented by +1 by the type clock pulse PSE except during the printing cycle. .

That is, at times other than the printing cycle, the selection signal 18 is input so as to select the lower side of the selector 2, that is, the code memory address section 8 side, and the control table 3 stores the code memory address (2) of page 4 The signal 17 is input so as to select the +1 address. When not printed in this way, the position of the printed characters is updated according to the movement of the printed character running body. That is, the content of the code memory / address section 8 is +
The current position of the print type traveling body is updated by stepping one by one.

In addition, when the type of the type carrier reaches a set of breaks,
The address of the code memory address unit 8 is reset by the reset signal.

In the print cycle, print data for at least one row of each hammer, ... (See FIG. 3) is set in the print data area of page 1 (see FIG. 7) of the print data memory 5. This printing is the same as (a), (b), and (c) described above with reference to FIG. 5, except for timing correction for speed fluctuations and control of dummy time, which will be described later, and therefore description thereof will be omitted.

In the present invention, the output of the average value circuit 7 is set in the address counter 1 at the start timing of each main scan. Further, the selector 2 causes the address counter 1 to operate in response to the selection signal 18.
The side is switched to output selectively. The output of the address counter 1 passing through the selector 2, that is, the average value is input as the address of the control table 3.

On the other hand, the control table 3 has a page select signal (SEL
S) 17 selects the correction data storage unit 3-1. The correction data storage unit 3-1 stores the matching start adjustment time ΔT (t ₅ ) of the main scan and the dummy times (t ₁ , t ₂ , t ₃ , t ₄ ) according to the average value.

Here, the collation start adjustment time ΔT is obtained by the equation (3). Further, the dummy time is obtained in advance as follows. That is, as shown in FIG. 2, when the average value of the printing cycle is T ₀ and the matching time of the sub-scan 1 to sub-scan 5 is T _{1 to} T ₅ , T ₀ − (T ₁ + T ₂ + T ₃ + T ₄ + T ₅ ) and the value obtained by dividing this by 4 is used as dummy time (t ₁ , t ₂ , t ₃ , t ₄ ).

By the output of the selector 2, the correction data storage unit 3-1
The main scan collation start adjustment time and the dummy time corresponding to the average value are set in the delay timer 10 and the dummy timer 11, respectively.

After this operation ends, the delay timer 10 starts.
When the collation start adjustment time ΔT set in the delay timer 10 is reached, the output signal 19 is obtained as the output of the delay timer 10. Sub-scan 1 is subsequently started.

When the sub scan 1 is completed, the dummy timer 11 set previously is started. When the output signal 14 of the dummy timer 11 is obtained, the sub scan 2 starts. Then, similarly, the dummy timer 11 is restarted and the same control is performed. In this way, the sub scans 1 to 5 are performed.

The delay timer 10 is started when the next type clock pulse P ₂ is output near the sub-scan 5. Then, when the output signal 19 is obtained from the delay timer 10, the delay value (matching start adjustment time) and the dummy value according to the average value at that time are again set from the correction data storage section 3-1 of the control table 3 again as before. Delay timer 10,
It is stored in the dummy timer 11. Then, based on these, the control as described above is performed.

The collation start adjustment time and the dummy time read before the main scan are used as the dummy time (t ₁ , t ₂ , t ₃ , t ₄ ) for the sub scan performed immediately after and the sub scan is being executed. It is used for the collation start adjustment time started by the type clock Pi obtained in the above.

At the beginning of the printing cycle, the collation start adjustment time is read out first, in which case the delay timer 10 is started. Therefore, the collation start adjustment time t ₅ ′ that is performed near the end of the first main scan is the one obtained at the beginning of the print cycle.

Next, the above operation will be described with reference to the time chart shown in FIG. As described above, the average value circuit 7 may calculate the speed variation rate by a method of comparing the number of clocks counted during the period of the constant print pulse number with that at the time of traveling at the standard speed. An example of obtaining the fluctuation rate will be described.

That is, the standard clocks generated between the print pulses are added by the adder (S1), and a 5-bit shift (32
Then, the average value is obtained (S2) and stored in the register (S3). This value is a value corresponding to the speed fluctuation rate.

Since the type clock P ₁ is input, the access cycle D of the collation start adjustment time and the dummy time is reached.

By the method as described above, the average value of the average value circuit 7 calculated prior to the type clock P ₁ is set in the address counter 7 (S4). The selection signal 18 of the selector 2 is set to the address counter 1 side (S5). Further, the page selection signal for the delay page in the control table 3 is input to the control table 3 (S6).

As a result, the delay page of the correction data storage unit 3-1 is read out, and the obtained delay value (collation start adjustment time) is stored in the delay timer 10 by the set signal 15 (S).
7).

Then, the page selection signal 17 of the dummy page is input to the control table 3 (S8). As a result, the dummy page is read, and the obtained dummy value is stored in the dummy timer 11 by the set signal 16 (S9).

Then, the address counter 1 is reset (S1
0), return to the initial value. Further, the delay timer 10 is activated (S11). When the delay value of the delay timer 10 has elapsed, the output signal 19 of the delay timer 10 is output (S12). As a result, the sub scan 1 is started.

In FIG. 1 (B), D is shown in a large size for the purpose of explaining the contents executed during the access cycle D.
In reality, the access cycle D is on the order of several hundreds of ns, and the printing cycle is on the order of several hundreds of μs, which is very short, so it can be ignored.

The selection signal 18 of the selector 2 is set to the address counter 1 side by the output signal 19 of the delay timer 10 (S
13). In addition, the page selection signal 17 of the control table 3
The magnet set address of page 1 is set so as to be selected (S14).

As a result, due to the output of the address counter 1 (1 in this case) reset to the initial value in S10, the division of 1 of the magnet set address, that is, the item of scan order 1 in FIG. Is set to (S15).

Next, the selection signal 18 of the selector 2 is set on the code memory / address section 8 side (S16). Control table 3
The page selection signal 17 is set to the code memory address (1) side of page 3 (S17). Then, by the set signal 12 output from the OR circuit 12, the scan order 1 of the code memory address (1) of page 3
The item of sub-scan 1 of print scan 1 is set in the code memory address section 8 (S18).

Then, the first digit of the print data area of the print data memory 5 is accessed by the data set in the address register 4 and the character code to be printed is output, and the code set by the data set in the code memory / address section 8 is coded. The memory 9 is accessed and the output character code is output (S19). The character code thus output is collated by the comparator 6 (S20). Then, the address counter 1 is incremented by 1 to prepare for the next scan order (S21).

By the way, each sub-scan 1 to sub-scan 5 is composed of a small cycle for accessing the memory, as shown in scan order 1, 2, 3 ... In FIG.
This is called a memory cycle. Further, the scan orders 1, 2, 3, ... In FIG. 4C have a corresponding relationship with this memory cycle. Then, as shown in FIG. 1B, the scans A1 and A2 correspond to memory cycles. That is,
Set the selector 2 to the address counter 1 side (S1
3) The control table 3 is designated as the magnet set address (S14). Next, the contents of the control table 3 are set in the address register 4 (S15). On the other hand, the access cycle of the code memory in the memory cycle is performed as follows. That is, the selection signal 18 of the secreter 2 selects the output of the code memory / address unit 8 (S16).
Next, the control table 3 is switched to the +4 address side of the code memory address (1) (S17). Subsequently, the timing signal for setting the accessed output of the control table 3 in the code memory / address unit 8 is the OR circuit 12.
Is input from below (S18). In this way (S
15), the print data memory 5 and the code memory 9 are accessed according to the contents set in the address register 4 and the code memory / address section 8 in (S18) (S19). Subsequently, the comparator 6 compares and collates the outputs of the print data memory 5 and the code memory 9 (S2).
0). After that, the address counter 1 is incremented by 1 in preparation for the next memory cycle (S21). The state of each part of these steps S13 to S21 can be summarized as shown in FIG.

When the scan A as in S13 to S21 is not obtained, the scan A1, A2, ... Are repeated until the scan order shown in FIG. . At this time, the dummy timer 11 operates at the end of the sub-scan 1, and the output signal 14 is generated after the dummy time t ₁ has elapsed. As a result, the sub scan 2 is started.

Also in the sub-scan 2, the scans A1, A2 ...
The same control as is performed. Such a process is repeated until the sub-scan 5 is executed.

In this way, when the next type clock P ₂ is input,
Similarly, the dummy time access cycle D ′ is performed, the same control as described above is performed, the delay timer 10 operates, and after the delay value (collation start adjustment time) has elapsed, the sub-scan 1 is executed. Control is performed. Such an operation is performed during the print cycle. The time T _{1 to} T ₅ of the sub-scan 1-5 does not matter even if the speed of the print carrier fluctuates.

Thus, when the cycle of the type clock gradually changes, the collation start timing time t ₅ and the dummy times t _{1 to} t ₄ follow this, and the collation operation corresponding to the type clock period is performed to obtain a collation match. Excitation is performed on the digit. This excitation time is automatically corrected by each dummy time. In addition, the start timing of the sub-scan 1 is controlled by the collation start adjustment time, and as a result, proper printing is performed in conformity with the speed of the type traveling body.

As a result, even if there is a speed change in the type conveyance body, since it can be corrected accurately and by a simple means, it is possible to always obtain good print quality. Moreover, the data can be rewritten, and a plurality of conditions can be set. Further, by providing the average value calculation unit, it is possible to correct fluctuations over a long period of time, and it is possible to exclude instantaneous fluctuations.

〔The invention's effect〕

According to the present invention, even if the speed of the print carrier varies due to frequency fluctuations or voltage fluctuations, the delay time (matching start adjustment time) and the dummy time of the matching start timing corresponding to the speed fluctuations are calculated in advance. deep. Then, the delay time (matching start adjustment time) and the dummy time are stored as correction data in the correction data storage area of the control table, respectively, and the delay time and the dummy time are used to determine each sub-scan timing. Has been corrected,
It is possible to correct the change in the speed of the print carrier, which is caused by the fluctuation of the motor speed, by a very simple means.
In this case, it is possible to more accurately adjust the excitation timing of the sub-scan by adjusting the dummy time, so it is possible to print the entire typeface accurately, and the part on the right or left side of the typeface may be cut and printed. Can be prevented and high quality printing can be performed. In this way, the average value calculating unit not only obtains the correction time data as described above, but also calculates the average value of the print variation factors, so that the instantaneous value due to mechanical disturbance such as the impact of the printer or the vibration from the outside can be obtained. The temporary variation acts as a buffer, and the printing position shift due to the instantaneous variation can be ignored.

Moreover, since the delay time (matching start adjustment time) and the dummy time, which are the correction data, can be obtained from the correction data storage area in the control table, the output of the average value calculation unit can be input to the address counter to This can be done by reading the set / reset address at the timing of the sub-scan as a part of the access to the control table, which enables hardware sharing and does not require any special hardware configuration or access control processing means. It is only necessary to generate the read timing after recognizing the timing of ending the sub-scan. For this reason, the increase in the amount of hardware is suppressed to the necessary minimum, without requiring complicated control,
The delay time (matching start adjustment time) and the dummy time can be obtained very easily.

Furthermore, it becomes possible to easily respond to a review of environmental conditions. That is, it is possible to easily change the data in response to the review of this condition. Further, fine adjustment of the correction result and the like becomes possible by rewriting the delay time and the dummy time.

[Brief description of drawings]

FIG. 1 (A) is a configuration diagram of an embodiment of the present invention, FIG. 1 (B) is an operation explanation time chart thereof, and FIG. 1 (C) is an explanation diagram of a state relation of each part of steps S13 to S21 in the sub-scan.
FIG. 3 is a diagram for explaining the operation, FIG. 3 is a diagram for explaining the correspondence between the type and hammer of the line printer, and FIG.
FIG. 5 is a conventional printing apparatus, FIG. 6 is an explanatory view of a control table, FIG. 7 is an explanatory view of a print data memory, FIG. 8 is a perspective view of a main part of a printer, and FIG. 9 is an explanatory view of problems. , FIG. 10 is an explanatory diagram of a conventional collation cycle and dummy time, and FIG. 11 is an explanatory diagram of another collation method. In the figure, 1 is an address counter, 2 is a secreter, 3 is a control table, 4 is an address register, 5 is a print data memory, 6 is a comparator, 7 is an average value circuit, 8 is a code memory address section, 9 is a code memory, 10 is a delay,
Timer, 11 is a dummy timer, 12 is an OR gate, 1
3 is a gate.

Continuation of front page (56) Reference JP-A-59-124878 (JP, A) JP-A-58-119883 (JP, A) JP-A-55-133978 (JP, A) JP-A-59-140071 (JP , A) JP-A-57-8348 (JP, A) JP-A-55-131880 (JP, A)

Claims (1)

[Claims] 1. A print hammer number having print characters arranged at predetermined intervals and print hammers arranged at intervals different from the above, and a print hammer number in which the print characters and print hammers face each other. A magnet set address area for holding information, a magnet reset address area for holding timing information for resetting the energized print hammer, and a code memory address area for holding character number information of printable characters by the print hammer. A control table 3 having (1), in which each area is selected by a selection signal, an address register 4 that holds information on a print hammer position that can be printed when the type belt is running, and an address register 4 that holds the information. The character code of the character to be printed, which is accessed by the information A print data memory 5 for storing the position corresponding the serial print hammer, a code memory address portion 8 with character number information of the printable print, and output from the address counter 1, the code memory
A selector 2 for selectively outputting any one of the output from the address section 8 to the control table 3, and a character type corresponding to the character number information of the type accessed by the character number information held in the code memory address section 8. A code memory 9 for holding a code, a print code output from the print data memory 5,
A comparator which compares the print codes output from the code memory 9 read by the information held in the code memory / address unit 8 and, when a match is obtained, outputs a match signal which is a print hammer excitation signal. In the printing apparatus including 6, an average value calculation unit 7 that calculates an average value of speed fluctuations of the type belt, and a first sub-portion of the print scan cycle provided in the control table 3 according to the speed fluctuations of the type belt. A correction data storage area 3-1 for holding a collation start adjustment time which is a timing adjustment time for determining and controlling a scan start timing and a dummy time for adjusting a time between sub-scans according to the speed fluctuation; Output the address to access table 3,
Further, the address counter 1 to which the output of the average value calculation unit 7 is input, and the correction data storage area 3-1 based on the average value.
The delay timer 10 in which the collation start adjustment time obtained from the above is set, and the correction data storage area 3-1 based on the average value.
Dummy timer 1 in which the dummy time obtained from is set
1 and accessing the correction data storage area 3-1 on the basis of setting the average value of the speed fluctuations of the print belt obtained by the average value calculation unit 7 in the address counter 1 to adjust the collation start adjustment. The delay timer 10 is controlled for the time, the dummy timer 11 is controlled for the dummy time, the first sub-scan is performed by the output of the delay timer 10, and the next sub-scan is performed by the output of the dummy timer 11. A printing device characterized by the above.