JPS6132153B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an impact type high-speed printer using a type carrier such as a belt, train, chain, etc. More specifically, the present invention relates to an impact type high-speed printer using a type carrier such as a belt, a train, or a chain. The present invention relates to a printing hammer control device that corrects printing hammer drive times so that they always match. Such type carriers are manufactured by mechanical means, but if the pitch between each type is not within a predetermined range, phenomena such as missing characters and side clipping occur. Therefore, very strict mechanical pitch accuracy is required. For this reason, the current situation is that type carriers are generally very expensive. In view of the above points, the present invention relaxes the strict mechanical precision required of the type carrier, and electrically compensates for this relaxed mechanical precision. That is, an object of the present invention is to reduce the mechanical precision required of a type carrier, thereby reducing the manufacturing cost of the type carrier. Another object of the present invention is to perform N sub-scans constituting each print scan while the type on the type conveyor moves one type pitch, two sub-scans excluding the first sub-scan.
The purpose of this invention is to electrically calculate and determine the driving timing of the printing hammer that is driven first in the (N-1) sub-scans after the (N-1)th sub-scan, thereby improving printing quality. The present invention will be explained below with reference to embodiment drawings in which the type conveyor is limited to a type belt.
It is clear from the following explanation that the invention can also be applied to chains and the like. FIG. 1 shows a part of a belt-type printer, and 10 is an endless type belt constituting a type conveyor, on the outer circumference of which there are type 11, reference marks 12 (see FIG. 3), and character marks. 1
3 is engraved. A pulley 14 drives the type belt 10, and is driven by a drive source such as a motor (not shown) to run the type belt 10 at a predetermined speed. Detectors 15 and 16 detect the reference mark 12 and character mark 13 on the type belt 10, and are installed close to the type belt 10. 17 is an ink ribbon, 18 is a printing paper, 19 is a printing paper 18
and a printing hammer that faces the type belt 10 via an ink ribbon 17, and is biased and driven by an electromagnet 20 as is well known. The printing method of such a belt type printer will be briefly described below with reference to FIG. Type 11 on type belt 10 and printing hammer 1
9 is 3:4, and sub-scanning is performed three times between when the character mark detector 16 detects one character mark 13 and when it detects the next character mark 13. , the printing hammer 1 whose printed character 11 matches the character to be printed during each sub-scanning
9 is driven to print (in FIG. 2A, the type 11 marked with an x is pressed by the printing hammer 19 and printed). First, in sub-scanning 1, 1 of the printing hammer 19
If the character to be printed in the digit matches the character 11 on the character belt 10 corresponding to the printing hammer 19, the printing hammer 19 is driven and the character in the first digit is printed. Next, if the character to be printed in the fourth digit of the printing hammer 19 matches the character 11, that is, the character 11 two characters after the character 11 corresponding to the first digit of the printing hammer 19, it will be printed in the same manner as described above. . Thereafter, the characters to be printed in the 7, 10, 13, . to print. Subsequently, in sub-scanning 2, the character to be printed by the printing hammer 19 in the second digit is compared with the printed character 11 corresponding to the printing hammer 19, and if they match, the printing hammer 19 is driven to print. From then on 5, 8, 11,
......, the printing hammer 19 of the 131st and 134th digits is compared with the type 11 corresponding to each digit, and if they match, the printing hammer 19 is driven to print. Furthermore, in sub-scanning 3, 3, 6, 9, ......, 132, 135
The digit printing hammer 19 is compared and printed in the same manner. These sub-scans 1, 2, and 3 constitute one print scan, which is continued until printing for one line is completed. (See FIG. 2B) Therefore, this printing scan is performed as many times as there are types of characters 11 on the maximum character belt 10. The above-mentioned correspondence 3:4 between the printing type 11 and the printing hammer 19 is a perfect correspondence (for example, the printing hammer 19
When the 1st digit of the printing hammer 19 corresponds to a certain type 11, the 4th digit of the printing hammer 19 corresponds to the type 1 two places after the said type 11.
1), but there is a slight deviation Trp as shown in FIG. 2A. This gap
Trp limits the number of printing hammers 19 that drive the printing hammers 19 all at once and press the printing belt 10 at the same timing, thereby reducing the strength of the printing belt 10 and reducing the impact when the printing hammers 19 press. This is to reduce speed fluctuations of the type belt 10 due to force. Therefore, this discrepancy is 1x, 2x, 3x, etc.
If the pattern is regular, then each printing hammer 19 corresponding to this deviation is set in one sub-scanning.
By delaying the time by Trp and sequentially applying the bias, the printing hammer 19 and each corresponding printing 11 can be correctly aligned. That is, as shown in FIG.
If the pitches between the printed characters 11 above, that is, the pitches d _i between the character marks 13, are all equal or within a predetermined precision range, the character mark detector 16 detects the character mark 13. or after a certain period of time, the printing hammer 19
All you have to do is drive it. However, if the printing hammer 19 is driven as described above when the accuracy of the pitch d _i is poor, the missing characters and side clipping occur, resulting in poor printing quality. In order to improve the printing quality, the timing at which the printing hammers 19 are driven may be adjusted for each printing hammer 19. In the present invention, the driving timing of the printing hammers 19 is adjusted for each printing hammer 19 in this way.Hereinafter, the present invention will be limited to a printing method in which each printing scan is divided into three sub-scans for printing. explain. In FIG. 4, the character mark detector 16
The distance from the position to the first digit of the printing hammer 19 is D _p , and the time from when the energizing current flows to the driving electromagnet 20 of the printing hammer 19 until the printing hammer 19 presses the type 11 on the type belt 10 is If the time required, that is, the flight time, is T _F and the type belt 10 is running at a predetermined speed υ, then the distance that the type belt 10 moves during the flight time T _F is D _F = υ×T _F ( 1) It can be expressed as Therefore, in order for the type 11 to be placed correctly at the center of the first digit of the printing hammer 19, it must be moved a distance D _F from the center of the first digit of the printing hammer 19 (indicated by the arrow ↑ in Fig. 4). All you have to do is drive the first digit of the printing hammer 19. Here, for convenience of the following explanation, the following is assumed. (i) Each flight time T _F of each printing hammer 19 is the same for each hammer. (ii) Pitch of each printing hammer 19 (D _H in Figure 4)
is the same across pitches. (iii) The running speed υ of the type belt 10 does not change and remains constant. Now, in order to press the first digit of the printing hammer 19 on the type 11 to be printed, the timing is such that the type to be printed (the 13th character mark 13 in Figure 4) is at the point F. It is time to pass through. Therefore, the character mark detector 16 detects the character mark 13 of the type 11 to be printed.
If you know how much time it takes to reach the target after it is detected, you will be able to print correctly. When the character mark 13 is detected by the character mark detector 16, the printed character 11 printed in the first digit of the printing hammer 19 is located nine places after the detected character mark 13 in FIG. Type 11 will be printed. That is,
In Figure 4, the fourth character mark 13
When detected, the 13th printed character 11 becomes the character printed in the first digit of the printing hammer 19. The total character pitch from this 4th character mark 13 to the 13th character mark 13 is It can be expressed as This value D _T is not constant because each character pitch d _i takes various values. Therefore, if the printing hammer 19 is driven when the character mark detector 16 detects the character mark 13 or after a certain period of time, correct printing will not be performed. Character mark detector 16 to printing hammer 1
Printing hammer 1 with distance D _P to the center of the first digit of 9
Since the distance D _F corresponding to the flight time T _F of 9 is constant, the distance D D between the type to be printed and the point _F is D _D = D _T − (D _P + D _F ) (3) It is. That is, the character mark detector 16
After detecting the character mark 13, if you wait until the type 11 to be printed moves by D _D and then drive the first digit of the printing hammer 19, correct printing will be achieved. Since D _T , D _p , and D _F above are distances, the value obtained by dividing these by the traveling speed υ has the dimension of time. T _T =D _T /υ T _P =D _P /υ T _F =D _F /υ (4) Here, for D _T Therefore, it may be set as d _i /υ=t _i . The character pitch d _i can be replaced by the time t _i . Therefore, when the traveling speed υ is constant, the above equation (3) becomes Then, when character mark 13 is detected,

If the first digit of the printing hammer 19 is driven after the time [Equation], correct printing will be performed. In this way, the driving timing for the printing hammer 19 in the first digit of the sub-scanning 1 of the printing scanning 1 to correctly press the type 11 is determined. After the first digit of the printing hammer 19 is driven, 4.
The printing hammers 19 for digits 7, 133, and 136 are driven, but as described above, the printing hammer 1 for a certain digit
When 9 perfectly corresponds to the type 11, there is a slight misalignment between the type 11 to be printed next and the printing hammer 19, so when the type belt 10 has moved by this amount of deviation, the printing hammers 19 are driven one after another. Just do it. However, since this amount of deviation differs for each digit, the timing at which the print hammer 19 is driven also differs for each digit. A method for correctly performing this drive timing and performing correct printing will be explained with reference to the timing for driving the fourth digit of the printing hammer 19. The type 11 on the type belt 10 corresponding to the fourth digit of the printing hammer 19 is the 15th type 11 in FIG. When the 13th printed character 11 corresponding to the 1st digit of the printing hammer 19 passes point F, the 15th printed character 11
is at a distance of (d ₁₃ +d ₁₄ ) from point F. Further, the distance from the center of the first digit to the center of the fourth digit of the printing hammer 19 is three times the hammer pitch _dH . When the 13th printed character 11 is now aligned with the center of the printing hammer 19, the 15th printed character 11 is offset by _δ2 from the center of the printing hammer 19, as shown in FIG. Therefore, after the first digit of the printing hammer 19 is driven, the fourth digit of the printing hammer 19 may be driven when the type belt 10 has traveled by _δ2 . This deviation δ ₂ is δ ₂ =(d ₁₃ +d ₁₄ )−3d _H (7). When converting this δ ₂ into time, since the type belt 10 runs at a predetermined speed υ, t ₂ =δ ₂ /υ (8). That is, the fourth digit may be driven _t2 hours after the first digit of the printing hammer 19 is driven. Furthermore, the driving _timing of the 7th digit of the printing hammer 19 is as shown in _FIG . All you have to do is drive the 7th digit. Here, δ ₂ ′ is δ ₂ ′=(d ₁₅ +d ₁₆ )−3d _H (10). Thereafter, the drive timing for the 10th, 13th, 16th, ......, 133rd, and 136th digits will be t from the drive timing of the printing hammer that was driven before the printing hammer 19 to be driven (for example, the 7th digit for the 10th digit). It is sufficient to drive with a delay of ₂ ⁽ⁿ⁾ = δ ₂ ⁽ⁿ⁾ / υ = {(d _i +d (i +1)) - 3d _H } / υ (11). The hammer drive timing in sub-scanning 1 printing has been described above, and next, the hammer drive timing in sub-scanning 2 printing will be explained. From the time when the first digit of the printing hammer 19 is driven in sub-scanning 1, the second digit of printing hammer 19 is driven first in sub-scanning 2.
The moving distance of the type belt 10 until a digit is correctly printed is indicated by D _M1 in FIG. Since this D _M1 is D _M1 = d ₁₃ - d _H (12), when converted into time it becomes T _M1 = D _M1 /υ = (d ₁₃ - d _H )/υ (13). In other words, in sub-scanning 1, 1 of printing hammer 19
If the second digit of the first printing hammer 19 is driven in sub-scanning 2 at a time T _M1 delayed from the time when the digit is driven, the 14th printed character 11 and the second digit of the printing hammer 19 match. Here, the driving time of the first digit of the printing hammer 19 that is driven first in sub-scanning 1 was taken as the reference time.
The printing hammer 19 that is driven last in sub-scanning 1
It is also possible to set the drive time of the 136th digit as the reference time, and in this case, the printing hammer 19 should be driven with a delay of T _M1 ′=T _M1 −t ₂ Σ (14) from the drive time of the 136th digit. Bye. Here, t ₂ Σ is the time elapsed from the driving of the first digit of the printing hammer 19 to the driving of the final 136th digit, It can be expressed as The subsequent driving of the 5th, 8th, 131st, and 134th digits may be performed sequentially using the method described in sub-scanning 1. In other words, the fifth digit of the printing hammer 19 only needs to be driven with a delay of t ₁₂ = δ ₁₂ /υ = {(d ₁₄ + d ₁₅ )−3d _H }/υ (16) from the driving time of the second digit. Also, printing hammer 19
The 8th digit is t ₁₂ ′=δ ₁₂ ′/υ={(d ₁₆ +d ₁₇ )−3d _H }/υ(17
). Subsequent 11, 14,...
...The same applies to digits 131 and 134. Next, in sub-scanning 3, the type belt runs from the time when the first digit of the printing hammer 19 is driven in sub-scanning 1 until the third digit of the printing hammer 19 that is first driven in sub-scanning 3 is correctly printed. The moving distance of 10 is indicated by D _M2 ' in FIG. This D _M2 ′ is D _M2 ′=(d ₁₃ +d ₁₄ )−2d _H (18), and if this is converted into time, T _M2 ′=D _M2 ′/υ={(d ₁₃ +d ₁₄ ) −2d _H }υ (19). That is, if the third digit of the printing hammer 19 that is driven first in the sub-scanning 3 is driven at a time T _M2 ' delayed from the time when the first digit of the printing hammer 19 is driven in the sub-scanning 1, the 15th digit is driven. The third digit of the type 11 and the printing hammer 19 match. Also, printing hammer 1 is driven first in sub-scanning 2.
If the time when the second digit of 9 is driven is taken as the reference time, the moving distance of the type belt 10 is shown as D _M2 in FIG. 5, and this D _M2 is T _M2 = d ₁₄ - d _H (20). Therefore, in terms of time, T _M2 = (d ₁₄ - d _H )/υ (21). That is, if the third digit of the printing hammer 19 is driven at a time T _M2 delayed from the time when the second digit of the printing hammer 19 is driven in sub-scanning 2, it will perfectly match the 15th printed character 11 . In sub-scanning 3, the following 6, 9, 12, ......, 132,
The 135-digit hammer drive timing is determined in exactly the same manner as in the sub-scanning 1 and sub-scanning 2 cases. In other words, after the third digit is driven, the 6th digit is t ₂₂ = t ₂₂ = δ ₂₂ /υ = {(d ₁₅ + d ₁₆ ) − 3d _H } / υ
It is sufficient to drive with a delay of (22). When the printing hammer at the 135th digit is driven, sub-scanning 3
That is, print scan 1 is completed and the process moves to print scan 2. The timing at which sub-scan 1 of print scan 2 is entered will be explained below. 1 of the printing hammer 19 that is first driven in sub-scan 1 of print scan 2 from the driving time of the first digit of the printing hammer 19 that is first driven in sub-scan 1 of print scan 1.
The distance that type belt 10 travels before a digit is driven is _d13 . Therefore, printing hammer 1 in sub-scan 1 of print scan 2 is delayed by T ₁ = d ₁₃ /υ (23) from the drive time of the first digit of print hammer 19 in sub-scan 1 of print scan 1.
All you have to do is drive the first digit of 9. If the driving time of the third digit of the print hammer 19 that is driven first in the sub-scan 3 of the print scan 1 is used as the reference time, the type 11 on the type belt 10 will be driven by the print hammer 19 in the sub-scan 1 of the print scan 2. The distance traveled to the center of the first digit is indicated by D _M3 in Figure 5, and this D _M3
is D _M3 = 2d _H − d ₁₄ (24), and when converted to time, it becomes T _M3 = (2d _H − d ₁₄ )/υ (25). Therefore, it is only necessary to drive the print hammer 19 with a delay of T _M3 from the drive time of the third digit in the sub-scan 3 of the print scan 1. Furthermore, if the drive time of the 135th digit of the print hammer 19 that is driven last in the sub-scan 3 of the print scan 1 is set as the reference time, then After the time, print hammer 19 in sub-scan 1 of print scan 2.
All you have to do is drive the first digit of . The drive timing of each print hammer 19 for the subsequent 4, 7, . Each character pitch d _i is a type belt 10.
If it is running at a predetermined speed υ, as mentioned above, it is converted to time t i expressed as t _i = d _i /υ (27), and using _{t i in} place of the character pitch d _i in each equation, Correct drive timing can be obtained by performing calculations. An example of the calculation formula necessary to obtain correct drive timing is shown below. T _M1 = t ₁₃ −T _H (13)′ T _M2 = t ₁₄ −T _H (21)′ T _M3 = 2T _H −t ₁₄ (25)′ t ⁽ⁿ⁾ = t _i +t _i+1 −3T _H (11)′ Note that here T _H =d _H /υ. In the above equation, only t _i can be considered as a variable, and the others T _p , T _F , and T _H can be considered constants. This variable t _i is measured and stored over all pitches before entering the printing process and while the type belt 10 is running at a predetermined speed υ, and the variable t _i necessary for determining the drive timing is read out. ,
Correct drive timing can be determined by performing predetermined calculations. Below, the process of measuring and storing the variable t _i is explained in the seventh section.
This will be explained with reference to the figures. In FIG. 7, 71 is the reference mark detector 15.
The clock pulse generator (hereinafter referred to as CPO) starts oscillation by the output from the clock pulse generator, and generates a clock pulse having a predetermined width t _w and a predetermined period t _f .
72 is a gate control circuit (hereinafter referred to as GCC) that generates a gate control output based on the output from the character mark detector 16;
4 is an AND gate that matches the outputs of the CPO 71 and GCC 72, respectively. Since the gate control output of GCC72 is generated alternately,
These AND gates 73 and 74 do not open their gates at the same time. 75 and 76 are outputs from AND gates 73 and 74, respectively, CPO7
a counter that counts clock pulses from 1 to 7;
7 is connected to the counter 7 via data buses a and b, respectively.
5 and 76, which is controlled by the output of the GCC 72 and alternately sends the count values of the counters 75 and 76 to a character pitch memory (hereinafter referred to as CPM) 78 via the data bus c. It is something that is remembered. When the reference mark detector 15 detects the reference mark 12 on the type belt 10, the output indicates the CPO.
71 starts oscillating and generates the clock pulse of the predetermined period t _f described above. Thereafter, the character mark detector 16 detects the character mark 13 (as shown in FIG. 3, the reference mark 12 and the character mark 13 are on the same vertical line, so they are actually detected at the same time, but the subsequent waveform shaping operation (This makes it as if the reference mark detector 15 detected it first), the GCC 72 operates based on its output, and the AND gate 73 generates an output that opens its gate. As a result, the clock pulse of CPO 71 is passed through AND gate 73 to counter 75.
and the number is counted. This counting continues until the character mark detector 16 detects the next character mark 13. When the character mark detector 16 detects the next character mark 13, the GCC 72 is activated, the AND gate 73 closes its gate, and the AND gate 74 opens its gate. As a result, counter 76 counts clock pulses from CPO 71. At the same time, the count value N _i of the counter 75 is input to the CPM 78 from the data selector 77. Note that since N _i is t _i =d _i /υ≒t _f ·N _i (28), the variable t _i is converted into the number of pulses N _i and then measured and stored. Thereafter, each time the character mark detector 16 detects the character mark 13, the counters 75 and 76 alternately count clock pulses, and the number of pulses N _i , that is, the variable t _i
is measured and memorized across all pitches before starting the printing operation. FIG. 8 is a block diagram of an arithmetic comparison circuit for determining drive timing. 81 is the character pitch memory address control counter (hereinafter referred to as
CPAC), which specifies an address within the CPM 78. 82 is the aforementioned T _H , T _p , T _F
83 is an arithmetic data memory (hereinafter referred to as ADM) for converting and storing numerical values N _H , N _p , N _F obtained by dividing the clock pulse by the period t _f of the clock pulse.
Arithmetic data memory address control counters (hereinafter referred to as DACs) 84, 86, and 88 which designate the address of are X register, Y register, and Z register, respectively. 87 is a logical operation unit (hereinafter referred to as ALU) that receives data from the X register 84 and the Y register 86 and performs the above-mentioned operations to determine drive timing, and its operations are controlled by the ALU control logic 85. Ru. Also
The calculation result of the ALU 87 is entered into the Z register 88. 89 receives the output from the character mark detector 16, which character mark 13 (number from the reference mark 12) is detected by the character mark detector 1.
This is an address counter control (hereinafter referred to as ACC) that determines whether the address counter 6 has passed, and controls the CPAC 81 and DAC 83 based on its output. 90 is the above CPO71
Count the clock pulses with exactly the same width t _w and the same period t _f as the pulses of
It is clock logic sent to ALU 87, and its operation is controlled by the output from character mark detector 16. The process of calculating and determining drive timing operations will be described below with reference to FIGS. 4 and 8. It is assumed that before this, the character pitches on the type belt 10 are measured over all pitches using the number N _i of clock pulses converted into time as described above, and are stored in the CPM 78. Character mark detector 16 detects character mark 1
3 is detected, ACC89 determines that it is the fourth mark, and CPAC81
is memorized. At the same time, clock logic 90 begins counting the clock pulses. Character pitch data t ₄ , that is, N ₄ stored at the address of CPM 78 specified by CPAC 81
is read out and this N ₄ is stored in the X register 84. Next, increase CPAC81 by 1 counter.
Read data N ₆ from CPM78 Y register 8
6. After that, X, Y registers 84, 8
The ALU 87 adds N ₄ and N ₅ stored in 6, and the resulting value (N ₄ +N ₅ ) is temporarily stored in the Z register 88 and then stored in the X register 84. Furthermore
The CPAC 81 is counted up by 1, and data _N5 is read from the CPM 78 and placed in the Y register 86. Here, the data of the X and Y registers 84 and 86 are added again by the ALU 87, and the result (N ₄ + N ₅ +
N ₆ ) is stored in the Z register 88 and then in the X register 84. Repeat the above operation until N ₁₂ and add it to the X register 84.

Store the value of [formula]. Next, N _p is stored in DAC83.
Specify the address of ADM 82, read N _p and store it in Y register 86. Here, the ALU 87 subtracts the data in the Y register 86 from the data in the X register 84, and the result of the subtraction is

[Formula] is stored in the Z register 88 and then stored in the X register 84. After that, change the DAC 83, specify the address of the ADM 82 where N _F is stored, read N _F and store it in the Y register 86, subtract the data in the Y register 86 from the data in the X register 84 again using the ALU 87, and then result

[Formula] is stored in the X register 84. With the above, the driving timing of the first digit of the printing hammer 19 that is driven first in the sub-scanning 1 of the printing scanning 1 is determined, and after this, the calculation result from the X register 84 is determined.

The ALU 87 compares [Formula] with the count value of the clock logic 90, and when the count value of the clock logic 90 matches the above calculation result,
A signal is output from the comparison output terminal of ALU87. This signal becomes the signal that drives the first digit of the printing hammer 19 (of course, before this, the characters to be printed and the type 11 on the type belt 10 are compared, and the drive signal is issued only when they match. ).
Note that clock logic 90 is cleared by this match output signal from ALU 87. The fourth and subsequent digits are determined as follows. First, N ₁₃ is stored in the counter of CPAC81.
After specifying the address of CPM 78 and reading N ₁₃ and storing it in X register 84 , CPAC 81 is counted up by 1, and N ₁₄ is read and stored in Y register 86 . After this, the data in the X and Y registers 84 and 86 are added, and the result of this addition (N ₁₃ +N ₁₄ ) is
It is stored in the X register 84 via the register 88. Next, N _H is stored in DAC83.
Specify the address of the ADM ₈₂ , read N _H and store it in the Y register 86, then subtract the data in the Y register ₈₆ from the data in _the The data is stored in the X register 84 via 88. Here, the Y register 86 is subtracted from the X register 84 again, and the result (N ₁₃ +N ₁₄ -2N _H ) is stored in the X register 84. Furthermore, by subtracting the data in the Y register 86, a result of (N ₁₃ +N ₁₄ -3N _H ) is obtained, which is stored in the X register 84. The ALU 87 compares this calculation result with the counter output of the clock logic 90, which counts clock pulses since the first digit of the printing hammer 19 is driven, and when they match, a drive signal is generated from the comparison output terminal. . The timing for driving the printing hammer for digits 7, 10, . . . 133, and 136 is determined in the same manner. In the case of the 7th digit, it is (N ₁₅ +N ₁₆ −3N _H ), and in the case of the 10th digit, it is (N ₁₇ +N ₁₈ −3N _H ), and the count starts from the time when the drive signal was generated one time before. The signal is compared with the counter output of the clock logic 90 that started the signal, and when they match, a drive signal is generated. The rest are exactly the same. The start timing of sub-scanning 2 is determined as follows after the 136th digit of printing hammer 19 is driven in sub-scanning 1. The CPAC 81 specifies the address of the CPM 78 where N ₁₃ is stored, reads N ₁₃ and stores it in the X register 84, and the DAC 83 specifies the address of the ADM 82 where N _H is stored.
N _H is read and stored in the Y register 86.
Next, from the data of X register 86, Y register 8
6 data and the result (N ₁₃ −N _H ) is Z
It is stored in the X register 84 via the register 88. During this time, the clock logic 90 is sending a counter output that has been counting clock pulses since the first digit of the printing hammer 19 was driven in sub-scanning 1 to the ALU 87, and this counter output is sent to the X register 84. When they match, a drive signal is generated from the comparison output terminal of ALU 87, and this is used for sub-scanning 2.
This becomes the second-digit printing hammer drive signal for the printing hammer 19 that is driven first. The determination of drive timing in subsequent sub-scanning 2 is performed in exactly the same manner as in sub-scanning 1. The start timing of the sub-scan 3 is determined as follows after the 134th digit of the printing hammer 19 is driven in the sub-scan 2. The CPAC 81 specifies the address of the CPM 78 where N ₁₄ is stored, reads N ₁₄ and stores it in the X register 84, and the DAC 83 specifies the address of the ADM 82 where _NH is stored.
N _H is read and stored in the Y register 86.
Next, from the data in the X register 84, the Y register 8
6 data and the result (N ₁₄ −N _H ) is Z
It is stored in the X register 84 via the register 88. During this time, the clock logic 90 outputs the counter output which has been counting clock pulses since the second digit of the printing hammer 19, which is first driven in sub-scanning 2, is driven.
It is sent to ALU87, and this counter output is
When the register 84 matches, a drive signal is generated from the comparison output terminal of the ALU 87, and this becomes the print hammer drive signal for the third digit of the print hammer 19 that is driven first in sub-scanning 3. The drive timing for subsequent sub-scanning 3 is determined in the same way as for sub-scanning 1. Finally, the timing determination when sub-scanning 3 ends, that is, printing scanning 1 ends, and moving to printing scanning 2 will be described. First, specify the address of CPM 78 where N ₁₄ is stored using CPAC 81, read N ₁₄ and store it in the X register 84, and specify the address of ADM 82 where _NH is stored using DAC 83.
N _H is read and stored in the Y register 86.
Next, from the data in Y register 86,
4 data is subtracted in register 87, and the result (N _H −N ₁₄ ) is sent to X register 8 via Z register 88.
4 to be memorized. Furthermore, the data in the X register 84 and the data in the Y register 86 are added by the ALU 87,
The result (2N _H −N ₁₄ ) is sent to X via Z register 88.
It is stored in the register 84. During this time, the clock logic 90 sends the output of a counter that counts clock pulses from the time of driving the third digit of the print hammer 19, which is first driven in the sub-scan 3 of the print scan 1, to the ALU 87, and this counter output is sent to the X register 84. When they match, a drive signal is generated from the comparison output terminal of the ALU 87, and this becomes the print hammer drive signal for the first digit of the print hammer 19 that is driven first in the sub-scan 1 of the print scan 2. Subsequent timing decisions for driving the print hammer can be made in exactly the same way as in print scan 1. The above calculations and comparisons of the ALU 87 are performed under the control of the ALU control logic 85. As described above, the present invention provides two
Since the driving timing of the printing hammer that is driven first in each subsequent sub-scanning is calculated and determined electrically, the desired type can be hit accurately even if the type pitch on the type carrier is misaligned. This makes it possible to improve printing quality and to easily determine the driving timing of the printing hammer to be driven thereafter in each sub-scan. In addition, the accuracy of forming the type on the type carrier does not require the same strict precision as in the past, and the type carrier can be manufactured easily and the manufacturing cost can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment in which the type conveyor of the present invention is limited to a type belt, FIG. 1 is a perspective view schematically showing the printing section, and FIGS. 2A and 2B show a printing hammer and a type belt for explaining the printing method. Correspondence diagram and correspondence diagram of print scanning and each sub-scan, Figure 3 is an enlarged front view of the type belt, Figure 4 is a correspondence diagram of the print hammer and type belt to explain the method of determining drive timing, Figure 5 6 is a diagram showing the correspondence between the printing hammer and each type, FIG. 6 is a drive timing diagram of each printing hammer, and FIG. 7 is a block diagram showing a configuration for measuring and storing character pitch.
FIG. 8 is a block diagram showing a configuration for calculating and determining the drive timing of each printing hammer. 10 in the diagram
11 is a type belt (conveyor), 11 is a type, 12 is a reference mark, 13 is a character mark, 16 is a character mark detector, 19 is a printing hammer, 71 is a clock pulse generator (CPO), 72 is a gate control circuit (GCC), 75 and 76 are counters, 78 is character pitch memory (CPM), 8
1 is a character pitch memory address control counter (CPAC), 82 is an arithmetic data memory (ADM), 83 is an arithmetic data memory address control counter (DAC), 84, 86, and 88 are registers, and 87 is an arithmetic logic unit (ALU). , 89 is an address counter control (ACC), and 90 is a clock logic.

Claims (1)

[Claims] 1. A type carrier having type characters and character marks corresponding to the type characters on its outer periphery, and a plurality of type carriers arranged in line along the printing position to strike the type on the type carrier. a printing hammer; a character mark detector for detecting the character mark;
a pitch storage means for running the type carrier at a predetermined speed, dividing each pitch between the character marks by the traveling speed of the type carrier over all pitches, converting the result into time, and measuring and storing the result; and the printing hammer. data storage means for storing a time value obtained by dividing the distance between the centers of the characters by the running speed and converting the distance between the centers of the characters by the traveling speed, and storing each printing scan while the characters on the type carrier move by one character pitch. In a high-speed printer in which the drive timing of each print hammer is calculated and determined by pitch data from the pitch storage means and time data from the data storage means, the first sub-scan in each print scan is divided into two sub-scans. When driving the printing hammer that is driven first in each sub-scanning after the second sub-scanning, the pitch data between the first printed character and the next printed character in the previous sub-scanning is read from the pitch storage means and also from the data storage means. Read the time data, determine the drive timing time by calculating the difference between the pitch data and the time data, measure the elapsed time from the start of driving of the printing hammer that was first driven in the previous sub-scanning, and measure this time. A printing hammer control method characterized in that a drive timing signal is generated when a value coincides with the drive timing time.