JPH022601Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an improvement of a print control circuit for a print drum type printer (hereinafter simply referred to as a printer) used in measuring instruments, general-purpose communication terminal devices, and the like.

(Prior Art) In general, printers continuously rotate or intermittently rotate a printing drum that has a predetermined number of digits (for example, 8 digits) in the axial direction on which codes such as numbers, letters, or symbols are placed in the circumferential direction of the surface. Usually, printing is performed by rotating a printing drum by a fixed angle and driving a printing hammer corresponding to a desired code on the printing drum at a certain timing. In this type of printer, generally, a plurality of digits of the same code are arranged in a row in the axial direction of the printing drum, and 0, 1 to 9, . . . , / are arranged in a circumferential direction perpendicular to the axial direction.

If there is a request to print a three-digit number, and one of the three digits is to be printed, for example, "2", the second last digit (tens), such as "002", is printed. In order to prevent "0" from being printed in each last third digit (hundredth place), the print control circuit has been devised.

That is, FIG. 1 shows a print control circuit of a conventional printer, and 11 indicates print information S, for example.
The hammer drive signals d1, d2,...d
8 (hereinafter referred to as drive signal, collectively referred to as d)
This signal generating circuit 11 is a hammer drive signal generating circuit (hereinafter referred to as the signal generating circuit) that generates a signal.Normally, this signal generating circuit 11 is not blank, but some kind of code is set, and the printing drum is also blank. There are often no printed parts.

The signal generated by the signal generating circuit 11 is a pulse, and its length is the time required to print one code on the printing drum. For example, the drive signal is issued at a timing earlier for the number "0" than for the number "1", regardless of whether it is an upper or lower order.

In other words, as an example, when printing a 7-digit number "1020201", the 2nd, 4th, and 6th digits "0" are simultaneously output as a drive signal at the earliest time, and at the next timing, the 1st digit is printed. and the 7th digit “1” at the same time, and finally the 3rd and 5th digit “2”
is simultaneously output as a drive signal.

12-1 to 12-2 are output lines corresponding to each position 1...8 of the signal generating circuit 11 (in the illustrated example, 8 represents the last digit, that is, the first digit).

13 is a hammer drive element for amplifying the drive signal d, and 14 is a printer hammer solenoid that receives the amplified drive signal d and drives a hammer (not shown) for printing a predetermined code at a predetermined timing. It is.

15 is a hammer drive signal control circuit (hereinafter referred to as
(referred to as a signal control circuit), and is configured such that its inhibit output i is input to an AND circuit 16 provided to the tens digit and hundreds digit output lines, respectively.

When this prohibition output i is input to the AND circuit 16, the drive signals d6 and d7 are not output from the AND circuit 16 while the print drum (not shown) rotates once.

For example, as shown in the time chart in FIG. 2, when the drive signals d6, d7, and d8 are output, respectively, the output lines 12-7, 12- 6 drive signal d7,
Since the inhibit output i output from the signal control circuit 15 is input to the AND circuit 16 at the same timing as d6, the output from the AND circuits provided on the output lines 12-7 and 12-6 is inhibited, and the printer The drive signal d8 of only the first digit 8 is now input to the hammer solenoid 14, and "2"
Only "002" is printed, and "002" is not printed.

(Problems to be Solved by the Invention) However, in order to configure the device in this way, it is necessary to separately provide a signal control circuit 15 in addition to the signal generation circuit 11.

In recent years, as a result of the remarkable progress in circuit integration, the signal generation circuit 11 is often constructed of LSI, and adding the signal control circuit 15 reduces the manufacturing cost, mounting space, etc. of this type of printer, etc. There was a problem that was considered undesirable from the viewpoint of

Means for Solving the Problems) In the present invention, in the printing circuit of the printing drum type printer as described above, three-digit printing information in which information indicating whether the number zero (0) is printed or not printed is set in advance. A signal generation circuit is provided as an input signal, and this signal generation circuit generates a 3-digit drive signal and a digit zero in a different digit from the 3-digit drive signal based on the information that the number zero (0) is not printed. A drive signal for printing (0) is generated.

Then, the drive signal of another digit is inverted through an inverting circuit, and this is added to the drive signal of the three digits to one gate of an AND circuit provided at the signal output point of the tenth place and the hundredth place. digit is 0
In this case, "0" in the tens or hundreds place is not printed.

(Function) In the above-mentioned configuration, if the number zero (0) unprinted information is added to the printed information, for example, "002",
When the hundredth digit is “0”, such as “010” or “022”, “0” is set in another digit, so
In synchronization with this digit drive signal, the above-mentioned upper digit "0" is made unprinted, "2", "10",
You can print something like “22”.

(Example) An example of the present invention will be described based on the drawings from FIG. 3 onwards.

FIG. 3 shows an example of a print control circuit for a printer according to this invention, and the major difference from the one in FIG. 1 is that one of the drive signals of the signal generation circuit 21 is used instead of the signal control circuit 15. The point is that it outputs a prohibited output.

In other words, a multi-digit drive signal is used to print a code that exists at a certain phase (position) in the circumferential direction of the printing drum, and to print a code of other digits that are in the same phase in the circumferential direction as this signal. A drive signal (d9 in the figure) is used to output a prohibition output, and a number zero (0) among the plural-digit printing code existing in the certain phase is printed as a blank. It is.

A drive signal d9 used for this inhibition is generated by the signal generating circuit 21 in synchronization with the drive signals d1 to d8, and is output to the signal line 12-9.

22 is an inverting circuit provided between this signal line 12-9 and the AND circuit 16.

In addition, in the figure, the same reference numerals as in FIG. 1 indicate the same parts.

In this way, when information with the number zero (0) not printed is added to the printed information S, for example, as shown in the time chart in Figure 4, a three-digit number such as "002" is added. If the drive signal d9 is set to "0" when the hundredth digit is zero (0), then when the drive signals d6, d7, and d8 are output, the tenth digit 7 and hundreds Drive signals d7, d for output lines 12-7, 12-6 of digit 6
Drive signal d for prohibition outputted from the signal generation circuit 21 at the same timing (synchronized) as 6.
9 is inverted by the inverting circuit 22, there is no output for printing from the AND circuit 16 provided on the output lines 12-7 and 12-6.

Therefore, printer hammer solenoid 1
Since the drive signal d8 of only the first digit 8 is inputted to 4, only "2" is printed and "002" is not printed, which is the same as in the conventional case.

By the way, in the above case, when setting the drive signal d9 to "0", the condition is that the hundredth digit is zero (0), but if the circuit is
Since it is configured as shown in the figure, if you delete this condition or add that the 10th digit is zero (0), the print information will change to, for example, “101” or “201”.
etc. are inappropriate because they will be printed as "11" or "21".

In addition, when the drive signal d9 used for prohibition is not output to the signal line 12-9 in the tens digit 7 and the hundreds digit 6, the prescribed printing is performed in the same way as for other digits. Needless to say, it will be done.

Further, whether or not to print 0 is determined by a determining means (not shown) provided upstream of the signal generating circuit 21, such as the number of digits, and the result is input to the signal generating circuit 21 as printing information.

(Effect of the invention) As described above, according to this invention, one of the drive signals of the signal generation circuit 21 is used to output the prohibition, so the upper two digits of the three-digit print information You can easily print the number zero (0) or print a blank.

For this reason, a separate signal control circuit 15 is required as in the conventional case.
There is no need to prepare.

Therefore, this type of printer can be manufactured economically and can be implemented rationally.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing a conventional example, Fig. 2 is a time chart for explaining the operation of the conventional example, Fig. 3 is a circuit diagram showing an embodiment of this invention, and Fig. 4 is a circuit diagram showing the operation of the embodiment. This is a time chart for explanation. d, d1, d2...d6, d7, d8, d9...
...Hammer drive signal, 16...First and second AND circuits, 21...Hammer drive signal generation circuit, 22...Inversion circuit.

Claims (1)

[Claim for Utility Model Registration] Drives a printing hammer for printing a necessary code using a printing drum with a plurality of different codes arranged in the circumferential direction and a predetermined number of digits arranged in the axial direction. In the print control circuit of the printer, input is three-digit print information in which information indicating whether the number zero (0) is printed or not printed is input, and the number on the print drum is input. Based on the three-digit printing hammer drive signal for printing, the information that zero (0) is not printed, and the information that the hundredth place of the three-digit number is zero (0), the three-digit a signal generating circuit that generates a printing hammer drive signal for printing a number zero (0) in a digit different from the digit that outputs the printing hammer drive signal; and printing the zero (0) in the other digit. an inverting circuit which takes as input a printing hammer drive signal for printing, and one input of which is the printing hammer drive signal of the tens digit among the three-digit printing hammer drive signals, and the inversion output of the inversion circuit is connected to the other a first AND circuit which has two inputs, a printing hammer drive signal of the hundredth digit of the three-digit printing hammer drive signal as one input, and an inverted output of the inverting circuit as another input; A printer print control circuit consisting of a second AND circuit and.