JPH0115387B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to printers, and particularly to 96-character and 128-character printers.
The present invention relates to a printer that can use a common carriage assembly and sensor receiver for character type wheels.

Recently, in the field of word processors, etc., instead of the golf ball method and type bar method,
Type wheel type printers are the mainstream, taking advantage of their high speed and print quality. As shown in FIG. 1a, the type wheel printer has a type wheel 2 attached to the shaft of a servo motor 1 on the carriage assembly, and a sensor disk 3, which is a transducer, attached to the same axis. Furthermore, a position detection sensor 4 is provided on the sensor disk 3, and during operation, the position detection sensor 4 first detects the position, sets the selection angle of the wheel 2, and operates the motor 1 according to the set angle. Rotate to align the type on wheel 2 to the desired position. After the type is selected in this way, a hammer operation is performed by driving a magnet (not shown) to print the characters on the type wheel 2 on the paper. As shown in FIG. 1b, the sensor disk 3 has slits 5 arranged at a constant angle along the circumference of the disk 3, and a reference hole 6 provided at a reference position. As a position detection sensor, in addition to the photo-sensing method described above, an inductosyn method is generally used.

As shown in FIG. 1c, the type wheel 2 has fingers 8 extending radially, and a type face 7 is disposed at the tip of the finger 8. By rotating the type wheel 2, a type is selected and printed. Usually up to 96 in two rows on the circumference, top and bottom
Can accommodate characters. In addition, in another type of type wheel 2, the maximum
It can accommodate 128 characters (64 characters per row).

With a traditional type wheel, 128 characters or 96
Since the transducer attached to the motor 1 that indicates the position of the type is different depending on the character, it is necessary to prepare two types of carriage assemblies, one for 128 characters and the other for 96 characters, depending on the intended use. Therefore, the receiver circuit of the transducer also needs to be adjusted together with the transducer of the carriage, so two types of receiver circuits are prepared.

FIG. 2 is a block diagram of a conventional type wheel type printer.

In FIG. 2, a type selection drive device 15 is equipped with a type selection motor 1, and a type wheel 2 is rotated by the type selection motor 1. A position signal generator 16 is connected directly or indirectly to the rotation shaft of the type selection motor 1.
This position signal generator 16 is composed of a slit 5 on the sensor disk 3 shown in FIG. A sinusoidal position signal P is generated. This position signal P is first input to a step signal generation circuit 18, which generates a step signal C indicating a unit movement amount.
This becomes an input to the subtraction counter 11.

A desired rotational speed N of the wheel 2 is initially set in the subtraction counter 11 by an external processing device (not shown) at the start of operation, and this N is sequentially subtracted by a step signal C. In other words, this subtraction counter 11
represents the number of remaining steps of wheel 2.

On the other hand, the position signal P generated by the position signal generator 16 is input to the speed signal generation circuit 17, and the actual speed signal V _p of the wheel 2 is generated.

This actual speed signal V _p is input to the subtraction circuit 13, and the contents of the subtraction counter 11 are converted from digital to analog to provide an analog speed instruction signal.
V _A is inputted to the subtraction circuit 13, V _A −V _p is calculated, and the difference signal is amplified by the power amplifier 14 and given to the type selection drive unit 15 to control the speed of the wheel 2. Ru.

When the type approaches the stop position, the position signal switching circuit 19 that has determined the value of the position signal P is activated and supplies the position signal P to the subtraction circuit 13, so that this position signal P is passed through the power amplifier 14 to select the type. It is applied to the drive unit 15, and the type is stopped at a desired position.

The position signal generating device 16 in FIG. 2 accommodates two characters in the upper and lower rows of the wheel 2 for 96 characters, so the number of fingers is 48, and the character spacing is 2.
Since it is a step sensor, it is equipped with a sensor disk 3 having a resolution of 96 steps all around the circumference. Also,
The position signal generator 16 with a 128-character wheel 2 is equipped with a sensor disk 3 having a resolution of 128 steps all around with 2 steps between characters. In addition, the reason why the character spacing is set to 2 steps is
This is to reduce the static position error when stopped and to increase the accuracy of speed control. in this way,
In the printer shown in Figure 2, the carriage's transducer and sensor/receiver circuits are designed for 96 characters.
Two types are required: one for 128 characters.

It is an object of the present invention to eliminate such drawbacks of the prior art, so that whether 96-character or 128-character wheels are used, a common carriage assembly and a common An object of the present invention is to provide a printer capable of printing using a sensor receiver.
The printer according to the present invention generates a signal from a transducer attached to a type selection motor, and counts the initially set number of rotations of the type wheel using the signal in a first counter to speed up the speed of the type wheel. In a printer that outputs a level and controls the speed of the type wheel by a value obtained by subtracting an actual speed signal created from the signal from the speed level, the signal is input and a signal corresponding to the rotation of the type wheel is output. and a switching means for switching the count rate of the second counter depending on the type of the type wheel, wherein the second counter converts the rotation of the type wheel used from the signal of the transducer. The present invention is characterized in that the drive speed of the type wheel is switched by creating a signal corresponding to , and counting the signal by the first counter.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a block diagram of a type wheel type printer of the present invention.

In FIG. 3, as is clear from a comparison with FIG. 2, two printers are provided to apply and subtract the step signal C from the step signal generation circuit 18.
First, the second counter 21 performs a subtraction, and then the output is given to the first counter 11 and subtracted from the initially set value N.

For both 96-character and 128-character wheels, if we set the resolution to 192, which is the least common multiple of the number of fingers accommodating 48 circumferential type for 96 characters and the number of fingers accommodating circumferential type 64 for 128 characters, in the case of 96 characters The number of steps between characters in the case of 128 characters is 4 steps, and the number of steps between characters in the case of 128 characters is 3 steps.

Therefore, as shown in FIG. 3, a character number switching circuit 20 is installed, and a second
When an instruction is given to the counter 21 to use a 96 character wheel, the second counter 21 is a quaternary counter, and when a 128 character wheel is used, the second counter 21 is a quaternary counter.
The counter 21 is operated as a ternary counter.

Further, the output of the second counter 21 is given to the first counter 11. The signal from the first counter 11 is input to the position signal switching circuit 19, and when the remaining steps on the first counter 11 reaches zero, the position signal switching circuit 19 outputs the signal from the position signal generator 16.
By applying the analog signal P from the subtraction circuit 13 to the subtraction circuit 13, the type is stopped at a desired position, as in the embodiment of FIG.

On the other hand, the output of the number of printed characters switching circuit 20 is directly connected to the first counter 11 and the DA converter 12. This is to switch the analog instruction speed V _A based on differences in wheel inertia or finger vibration frequency for different typefaces.

At this time, the count rate of the first counter 11 is switched depending on the type of wheel, and the output of the DA converter 12 is changed to obtain different analog instruction speeds. The other circuits are exactly the same as in FIG.

4 and 5 are operation time charts of the first counter and the second counter in FIG. 3, respectively.

FIG. 4 shows each timing when selecting 8 characters with a 128-character wheel, and FIG. 5 shows each timing when selecting 6 characters with a 96-character wheel.

In Figure 4, the output of the second counter CTRA is a clock signal (step signal) after the start.
At the rise of the first pulse of C, it becomes low level,
Next, it becomes high level at the third rising edge, and becomes low level again at the fourth falling edge.
Next, it becomes high level at the sixth rising edge, and becomes low level at the seventh falling edge. In this way, positive pulses are output every third clock signal C and applied to the first counter CTRB.

The first counter CTRB is the second counter CTRA
is sequentially subtracted by the output of
A speed instruction is given to the next stage DA converter 12 based on the value of RD. V1 to V3 are the first counters
This is the instruction speed timing that CTRB outputs to the DA converter 12. That is, at the start of operation,
The output is kept at a high level until the remaining steps of the first counter CTRB reach 5, and a speed instruction of V3 is given. Next, when the number of remaining steps on the first counter CTRB reaches 4, the output is set to high level for a period of 4 to 2, and a speed instruction of V2 is given. Finally, when the remaining steps of the first counter CTRB become 1,
Instructs the speed of V1. In response to the instructions from V3 to V1, the value subtracted by the subtraction circuit 13 is applied to the character selection drive device 15 through the power amplifier 14, and the rotation of the wheel is decelerated to complete the desired rotation.

Next, in FIG. 5, the second counter CTRA
After starting, clock signal (step signal) C
It goes low at one step of the clock signal C, then goes high between the 4th and 5th steps, then goes high between the 8th and 9th steps, and thereafter outputs a high level at every 4th step of the clock signal C to start the quaternary counter. operates as

The first counter CTRB is the second counter CTRA
is sequentially subtracted by the output of V1 to V3 to give speed instructions of V1 to V3 to the DA converter.

First, at the start of operation, the first counter CTRB
The speed of V3 is instructed from the 1st counter.
When the remaining step RD of CTRB becomes 3, a speed instruction of V2 is given, and then when the remaining step RD becomes 1, the speed instruction changes to V1.

That is, according to the instructions from the number of printed characters switching circuit 20,
The first counter CTRB switches from the V3 instruction speed to the V2 instruction speed for the DA converter 12.
When using a 128-character wheel, the process is performed at the timing of the remaining step 4, and when using a 96-character wheel, the process is performed at the timing of the remaining step 3.

In this example, in order to simplify the explanation,
The output of the first counter CTRB is set to be the same for 96 characters and 128 characters, but as mentioned above, to achieve stricter control, the optimal control for each can be achieved by making the output different. can be set. Also, the count of the second counter
As a means for switching the rate, in addition to switching manually or using a control signal, it is also possible to detect and judge the state of wheel replacement using a sensor or the like and automatically switch the rate.

As explained above, according to the present invention, the signal from the transducer is counted by switching the second counter depending on the type of wheel (128 characters or 96 characters), and the clock signal corresponding to the wheel is counted by switching the second counter depending on the type of wheel (128 characters or 96 characters).
A common carriage assembly and sensor receiver can be used regardless of whether a 96-character or 128-character wheel is used, and the user can swap wheels to generate control signals. You can easily switch between 96 characters and 128 characters by simply switching.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the wheel and sensor disk of a type wheel type printer, Figure 2 is a block diagram of a conventional type wheel type printer, and Figure 3 is a block diagram of a type wheel type printer showing an embodiment of the present invention. , 4 and 5 are operation time charts of the first and second counters for 128 characters and 96 characters, respectively. 1: Servo motor, 2: Type wheel, 3:
Sensor disk, 4: Position detection sensor, 5: Slit, 6: Reference hole, 7: Type surface, 8: Finger, 11: Subtraction counter (first counter), 1
2: D-A converter, 13: Subtraction circuit, 14: Power amplifier, 15: Type selection drive unit, 16: Position signal generator, 17: Speed signal generation circuit, 18:
Step signal generation circuit, 19: position signal switching circuit, 20: number of printed characters switching circuit, 21: second counter.

Claims (1)

[Claims] 1. Generate a signal from a transducer attached to the type selection motor, count the initially set number of rotations of the type wheel using the signal, and output the speed level of the type wheel; In a printer that controls the speed of the type wheel by a value obtained by subtracting an actual speed signal created from the signal from the speed level, a second printer receives the signal and generates a signal corresponding to the rotation of the type wheel. A counter and a switching means for switching the count rate of the second counter depending on the type of type wheel, and the second counter generates a signal corresponding to the rotation of the type wheel used from the signal of the transducer. death,
A printer characterized in that the drive speed of the type wheel is switched by counting the signal by the first counter.