JPH01225560A - Magnet driving circuit - Google Patents

Abstract

PURPOSE:To perform printing at a high speed, in a dot line printer having a plurality of heads, by storing the data to be printed next in a pin especially during the driving of said pin. CONSTITUTION:A decoder 11 sends out a decoded pin selection signal to a supply means 26 and, corresponding to a printing speed, the change-over signal corresponding to the supply interval of the exciting current sent out to a magnet coil 22 is sent out to the supply means 26 from a terminal SELb. Therefore, the supply means 26 alternately sends out data showing whether the magnet coil 22 is selected to a memory means 27 or 28 on the basis of said change-over signal. By this method, the memory means 27, 28 receive data showing whether the magnet coil 22 is to be selected next from the supply means 26 during a time when the magnet coil 22 is selected and excited for the sake of printing to store the same and successively sends out said data through an indication means 29. Therefore, a time wherein a processor sets data to the decoder 11 can be set to 0 apparently and the load of the processor is reduced and a printing speed can be increased.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a magnet drive circuit that enables high-speed printing in a dot line printer by storing data to be printed next by the bin while the bin is being driven, improving printing speed. In order to achieve this, a plurality of heads are each equipped with a plurality of magnetic coils for driving printing pins, and the magnetic coil to be driven for printing is selected for each head in accordance with the printing data.
A dot line printer that prints dots by supplying excitation current to the selected magnetic coil, comprising: a storage means for storing a plurality of pieces of information indicating whether or not to select the magnetic coil in correspondence with the print data; means for sequentially supplying the information to the storage means; and means for sequentially reading the information from the storage means and instructing the driving of the magnet coil specified by the information, and supplying an excitation current to the selected magnet coil. During this time, the next information is stored, and the selection of the magnet coil to be driven next is completed based on the stored information.

[Industrial application field]

The present invention relates to a tontoline printer, and more particularly to a magnet drive circuit that enables high-speed printing by storing data to be printed next by a pin while the pin is being driven.

BACKGROUND OF THE INVENTION With the development of an information society, dot line printers are being used to quickly print results processed by data processing devices. This dot line printer has a plurality of heads, which are arranged at equal intervals, and all of the heads print while simultaneously moving in the horizontal direction.

The print area of one head is the distance between it and the adjacent head, and each head reciprocates over this distance to perform printing.

By the way, this dot line printer is required to increase the printing speed, and the number of heads is increasing accordingly, and the number of magnets that are driven simultaneously is increasing, but it does not affect the printing speed. It is necessary.

[Conventional technology]

FIG. 4 is a block diagram showing an example of a dot line printer.

The processor 1 operates by reading a program stored in the ROM 2, passes through the interface circuit 4, stores print data input from the host device in the RAM 3, reads it out, and sends it to the line head 6 via the head control circuit 5. to print.

At the same time, the processor 1 drives the space motor 8 via the space control circuit 7 to perform a space operation that positions each head of the line head 6 at the print start position.

When the printing of one line is completed, the processor 1 drives the line feed motor 10 via the line feed control circuit 9 to feed the paper.

FIG. 5 is a block diagram showing an example of a magnet drive circuit.

FIG. 5 shows a drive circuit for one magnet of one of the plurality of heads constituting the line head 6 of FIG. 4. FIG. A pin selection signal is input from the head control circuit 5 shown in FIG. 4 to the terminals A-C, and this pin selection signal is taken into the decoder 11 by the cent signal input from the terminal SET, decoded by the decoder 11, and sent to the terminal. A signal for selecting the magnet coil 22 is sent from O to the driver 26 in accordance with the print data.

In addition, a signal for selecting a magnet coil is sent from the ■ terminal of the decoder 11 in response to print data for one magnet of another head (not shown), and a signal for selecting a magnet coil is sent from the ■ terminal of the ζ decoder 11 (not shown). A signal for selecting a magnet coil is sent in response to print data for one magnet of the other one head.

When a signal enabling the driver 26 is input from the terminal SEL to drive the magnet coil 22, the driver 26 sends out "0", so the NOT circuit 21 outputs "1".
'' and the internal impedance becomes high, the current sent by the comparator circuit 2o is input to the base of the transistor 24, the transistor 24 is turned on, and current flows from the power supply ■E to the magnet coil 22. Therefore, the magnet coil Reference numeral 22 drives a pin (not shown) to print dots on the paper.

This current flows to the resistor 25 via the transistor 24, and the voltage generated at the resistor 25 is sent to the comparison circuit 2o, where it is compared with the reference voltage input from the terminal 8. When the voltage developed across resistor 25 becomes higher than this reference voltage, comparator circuit 20 stops sending current to the base of transistor 24, so transistor 24 is turned off.

Furthermore, when the voltage generated across the resistor 25 becomes lower than this reference voltage, the comparator circuit 20 sends out current again, so the transistor 24 is turned on. By repeating such operations, a constant current determined by the reference voltage flows through the magnet coil 22 on average.

When the transistor 24 is turned off, the diode 23
Extra energy generated in the magnet coil 22 is absorbed.

[Problem to be solved by the invention]

In order to improve the printing speed, it is necessary to shorten the time interval at which the magnet coil 22 is excited to speed up the printing cycle, but as mentioned above, conventionally the magnet coil 22 is excited to print dots. After that, the next pin selection signal is sent to the decoder 11 in accordance with the print data, and data indicating whether or not to excite the magnet coil 22 is set.

Moreover, as the number of heads constituting the line head 6 has increased as described above, the amount of data sent to the decoder 11 has also increased, so the burden on the processor 1 has increased, and it is difficult to set data in the decoder 11. It took a long time,
There is a problem in that it is becoming difficult to respond to the increase in printing speed.

In view of these problems, the present invention allows the processor 1 to set data in the decoder 11 by latching data inside the magnet drive circuit and storing the next data while the magnet coil 22 is being excited. The apparent time for printing is set to zero, and the purpose is to improve printing speed.

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of the present invention.

The same symbols as in FIG. 5 indicate the same functions. Decoder 1
1 sends the decoded pin selection signal to the supply means 26. A switching signal corresponding to the supply interval of the excitation current sent to the magnet coil 22 is sent from the terminal 5ELb to the supply means 26 in accordance with the printing speed. Therefore, based on this switching signal, the supply means 26 supplies the magnet coil 22 with
Information on whether or not has been selected is alternately sent to the storage means 27 or 28.

The memory means 27 clears its memory contents in response to a resetting signal inputted from the terminal RESb, and the auxiliary memory means 28 clears its memory contents in response to a reset signal inputted from the terminal RESa, and takes in the information sent out by the supply means 26.

The instruction means 29 reads information from the storage means 27 or 2 on whether the magnet coil 22 is selected or not using the switching signal inputted from the terminal 5ELa, and sends it to the transistor 24 via the NOT circuit 21.

Therefore, when the magnet coil 22 is selected, an excitation current flows and drives the pin.

In addition, the switching signal input from terminal 5ELb and the terminal RES
A reset signal input from terminal 5ELa and terminal RESa and a switching signal input from terminal 5ELa are generated and supplied from the head control circuit 5 shown in FIG. 4 in correspondence with the print cycle.

[Effect]

By configuring as described above, the storage means 27 and 28
While the magnet coil 22 is selected and energized for printing, it receives from the supply means 26 information on whether or not it has been selected next, stores it, and sequentially sends it out via the instruction means 29. Processor 1 shown in Figure 4 is decoder 1
It becomes possible to reduce the apparent time for setting data to 1 to 0, reducing the burden on the processor 1 and improving the printing speed.

〔Example〕

FIG. 2 is a block diagram of a circuit showing an embodiment of the present invention.
FIG. 3 is a chart illustrating the operation of FIG. 2.

In the north of FIG. 2, the same reference numerals as in FIG. 5 indicate the same functions. As shown in FIG. 3 A-C, the pin selection signal ■ is inputted from the head control circuit 5 in FIG.
A set signal inputted from the terminal 1 is taken into the decoder 11, decoded by the decoder 11, and a signal for selecting the magnet coil 22 is sent from the terminal 2 to the drivers 12 and 13 in accordance with the print data.

In addition, a signal for selecting a magnet coil is sent from the ■ terminal of the decoder 11 in response to print data for one magnet of another head (not shown), and a signal for selecting a magnet coil is sent from the ■ terminal of the decoder 11 (not shown). A signal for selecting a magnet coil is sent in response to print data for one magnet of the other one head.

At this time, as shown in FIG. 3, 5ELb, "0" is sent from the terminal 5ELb to the drivers 12 and 13, and the driver 13 is enabled, but the driver 12 does not operate. Therefore, data sent from the O terminal of the decoder 11 is sent to the NAND circuit 16 via the driver 13.

NAND circuits 16 and 17 form a latch circuit, and NAND circuits 16 and 17 form a latch circuit.
As shown in FIG. 3, 5ELa, "l" is always input to the D circuit 17 from the terminal RESa, so the NAND circuit 1
6 sends "1" to the driver 19 when the driver 13 sends "0".

When the terminal 5ELa is inverted from "1" and outputs "0" as shown in FIG.
Inverts the “1” sent by the
The NOT circuit 21 sends the signal to
1'' to transistor 24.

That is, since the internal impedance of the NOT circuit 21 becomes high, the transistor 24 is turned on, and current flows from the power supply V to the magnet coil 22. Therefore, the magnet coil 22 drives a pin (not shown) to print dots on the paper.

Since the operation of the comparator circuit 20 is the same as described above, detailed explanation will be omitted.

When "0" is input as a reset signal to the NAND circuit 17 from the terminal RESa, the NAND circuit 16 sends "0" to the driver 19, and the driver 19 sends "1" to the NOT circuit 21, so the NOT circuit 21 outputs "0". 0'' to transistor 24.

That is, since the internal impedance of the NOT circuit 21 becomes low, the base voltage of the transistor 24 decreases, turning it off, and the current flowing from the power source 2 to the magnet coil 22 is blocked.

Next, as shown in FIG. 3 A-C, the pin selection signal ■ is input from the head control circuit 5 in FIG. A set signal input from SET is taken into the decoder 11, decoded by the decoder 11, and a signal for selecting the magnet coil 22 is sent from the terminal 2 to the drivers 12 and 13 in accordance with the print data.

At this time, as shown in FIG. 3, 5ELb, "1" is sent from the terminal 5ELb to the drivers 12 and 13, and the driver 12 is enabled, but the driver 13 does not operate. Therefore, data sent from the O terminal of the decoder 11 is sent to the NAND circuit 14 via the driver 12.

NAND circuits 14 and 15 form a latch circuit, and NAND circuits 14 and 15 form a latch circuit.
Since @1'' is always input to the D circuit 15 from the terminal RESb as shown in FIG. 3 5ELa, the NAND circuit 1
4 sends "1'" to the driver 18 when the driver 12 sends "0".

When the terminal 5ELa is inverted from "0" and sends "1" as shown in FIG. 3, the driver 18 is enabled and the NAND circuit 14 is
Inverts the “1” sent by the
The NOT circuit 21 sends the signal to
“1” is sent to transistor 24.

That is, since the internal impedance of the NOT circuit 21 becomes high, the transistor 24 is turned on, and current flows from the power source 2 to the magnet coil 22. Therefore, the magnet coil 22 drives a pin (not shown) to print dots on the paper.

When "0" is input as a reset signal from the terminal RESb to the NAND circuit 15, the NAND circuit 14 sends "0" to the driver 18, and the driver 18 sends "l" to the NOT circuit 21, so the NOT circuit 21 “O” is sent to transistor 24.

That is, since the internal impedance of the NOT circuit 21 becomes low, the base voltage of the transistor 24 decreases, turning it off, and the current flowing from the power source VE to the magnet coil 22 is blocked.

〔Effect of the invention〕

As explained above, the present invention can reduce the burden on the processor and improve the printing speed.

[Brief explanation of the drawing]

Fig. 1 is a principle block diagram of the present invention, Fig. 2 is a block diagram of a circuit showing an embodiment of the present invention, Fig. 3 is a time chart explaining the operation of Fig. 2, and Fig. 4 is a block diagram of the principle of the present invention.
The figure is a block diagram showing an example of a dot line printer, and FIG. 5 is a block diagram showing an example of a magnet drive circuit. In the figure, 1 is a processor and 2 is a ROM. 3 is RAM, 4 is interface circuit, 5
is a head control circuit, 6 is a line head, 7 is a space control circuit, 8 is a space motor, 9 is a line feed control circuit, IO is a line feed motor, 11 is a decoder, 12, 13, 18, and 19 are drivers, 14 to 17 are 20 is a comparison circuit, 21 is an N07 circuit, 22 is a magnet coil, 23 is a diode, 24 is a transistor, 25 is a resistor, 26 is a supply means, 27 and 28 are storage means, and 29 is an instruction means. Dot line 1 nonta one octopus and no fupa 0 soft drawing 4 (2)

Claims (1)

[Claims] A plurality of heads are each provided with a plurality of magnet coils (22) for driving printing pins, and the magnet coils (22) to be driven for printing for each head are provided in accordance with print data.
22) and select the selected magnet coil (22).
In a dot line printer that prints dots by supplying excitation current to the magnetic coil (22), the magnetic coil (22)
Storage means (27) for storing a plurality of information on whether to select
) (28), means (26) for sequentially supplying the information to the storage means (27) and (28), and reading out the information sequentially from the storage means (27 and 28) to determine the information specified by the information. Means (29) for instructing the drive of the magnet coil (22) is provided, and while the exciting current is being supplied to the selected magnet coil (22), the following information is stored, and the stored information is A magnet drive circuit characterized in that the selection of the magnet coil (22) to be driven next is completed based on the selection of the magnet coil (22) to be driven next.