JPH0115388B2 - - 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 print quality and high speed. The type wheel printer, as shown in Figure 1a,
A type wheel 2 is mounted on the shaft of a servo motor 1 on the carriage assembly, and a sensor disk 3, which is a transducer, is mounted on the same shaft.
, and a position detection sensor 4 is installed on the sensor disk 3. During operation, the position detection sensor 4 first detects the position, sets the selection angle of the wheel 2, and then adjusts the selection angle according to the set angle. Rotate the motor 1 to align the letters on the wheel 2 to a predetermined 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 generator 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, which is equipped with a 128-character wheel 2, is equipped with a sensor disk 3 having a resolution of 128 steps around the entire circumference 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.

Thus, the printer of FIG. 2 requires two types of carriage transducers and sensor/receiver circuits, one for 96 characters and one for 128 characters.

The object of the present invention is to eliminate these conventional drawbacks, and to eliminate these conventional disadvantages, whether 96-character or 128-character wheels are used, it is possible to use a common carriage assembly and a common carriage by simply exchanging the wheels and switching control signals. An object of the present invention is to provide a printer capable of printing using a sensor receiver.
The printer of the present invention generates a signal from a transducer attached to the type selection motor, counts the initially set number of rotations of the type wheel using the above signal, outputs the speed level of the type wheel, and outputs the speed level of the type wheel. In a printer that controls the speed of the type wheel by the value obtained by subtracting the actual speed signal created from the speed level from the speed level, two
A transducer having a resolution that is a common multiple of the stop positions on the circumference of the type wheels or more; a switching means for switching a multiplier a to the desired rotation speed N of the type wheels depending on the type of the type wheels; The present invention is characterized in that a conversion means is provided for converting the desired number of revolutions N of the type wheel counted by the signal , into a numerical value aN corresponding to the type wheel.

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, a multiplication circuit 21, which is a conversion means, is provided before the subtraction counter 11, and a multiplier is switched according to the type of wheel by a printing number switching circuit 20. It will be done. Further, the number of printed characters switching circuit 20 switches the switching timing of the designated speed value from the subtraction counter 11 depending on the type of wheel, and also switches the analog amount of the digital/analog converter 12.

128 characters with a circumference of 64 characters and 96 characters with a circumference of 64 characters
If the resolution of the transducer for both wheels is 192, which is the least common multiple of 48, then in the case of 96 characters there will be 4 steps between each character, and in the case of 128 characters there will be 3 steps between each character.
It becomes a step.

Therefore, at the start of operation, when the desired number of rotations N of the wheel 2 is initially set in the multiplication circuit 21, which is a conversion means, by an external processing device, the number of printed characters switching circuit 20 changes the number of rotations of the multiplication circuit 21 according to the type of the set type wheel. Switch the multiplier a. That is, in the case of a 96-character wheel, a multiplier of 4 is selected for the desired number of circuits N, and 4N data is sent from the multiplication circuit 21 to the counter 11. Also, in the case of a 128 character wheel, a multiplier of 3 is selected and the multiplier circuit 21
3N data is input to the counter 11 from .
Further, the number of printed characters switching circuit 20 inputs information on the number of printed characters to the counter 11 and the DA converter 12, and switches the step of switching the speed instruction signal based on the number of printed characters and the analog amount at the time of DA conversion.

Other circuit operations are almost the same as in FIG.

FIG. 4 is an operation time chart in FIG. 3.

Now, in the case of a 96-character wheel, if the desired number of rotations is set to 6 from the external processing device, the multiplier circuit 21 is switched to the multiplier 4 by the number of characters switching circuit 20, so 6×4=24 is the next stage. counter 11
is input. In this case, the number of switching steps and the amount of conversion of the counter 11 and the DA converter 12 are not switched by the number of printed characters switching circuit 20.

FIG. 4d shows a clock (step signal) C applied to the counter 11 from the step signal generation circuit 18. As the counter 11 counts down, the remaining steps of the counter 11 are counted down.
CTRRD indicates the value shown in FIG. 4c.

The counter 11 gives a speed instruction at the speed level V3 shown in FIG. 4g until 12 steps before the stop position, and then is switched to the speed level V2 shown in FIG. The signal is switched to the speed level V1 shown in FIG. 1, and then switched to the position signal in the detent area near the stop position.

That is, as in the embodiment shown in FIG. 2, when the type approaches the stop position, the position signal switching circuit 19
is activated and the position signal P is given to the subtraction circuit 13.

As a result, the DA converter 12 outputs an analog output V _a to the subtraction circuit 13 as shown in FIG.
On the other hand, the actual speed signal V _P as shown in FIG.
3, so in the subtraction circuit 13, V _a −V _p
is calculated, and the difference output shown in _FIG . As shown in Figure 4j, the rotation of the wheel is braked twice, once before the 12th step and once before the 4th step.

As shown in FIG. 4a, the character steps of the 96 character wheel are sequentially decreased from the initial setting value of 6 every 4 steps of the step signal C, and the stop position is 0.
approach.

Next, in the case of a 128 character wheel, if a desired number of rotations of 8 is initially set from the external processing device in the same way, the multiplier circuit 21 is switched to the multiplier of 3 by the number of printed characters switching circuit 20, so 8×3= twenty four
is input to the counter 11 at the next stage. In this case as well, the number of switching steps and the amount of conversion of the counter 11 and the DA converter 12 are not switched from the printed character number switching circuit 20. Therefore, counter 1
1, when a predetermined number of steps are reached for the DA converter 12, as shown in FIG. 4g, f, and e,
Instructions are given at each speed level of V3, V2, and V1.

Then, as shown in FIG. 4b, the character steps of the 128 character wheel approach the stop position 0 by sequentially subtracting from the initial value 8 every three steps of the step signal C.

In the embodiments shown in FIGS. 3 and 4, a multiplier circuit 21 is provided to convert the initially set desired type rotation number into the number of steps corresponding to the wheel.
Converting the step signal produced by the transducer itself into a clock corresponding to the wheel also allows the transducer receiver and carriage assembly to be made common to dissimilar wheels. In that case, instead of providing means such as a counter for converting the step signal, the multiplication circuit 21 becomes unnecessary.

As explained above, according to the present invention, a multiplier circuit is provided which converts the desired number of rotations of type into a number of steps corresponding to the type of wheel.
Both 96- and 128-character wheels can be printed using a common carriage assembly and common sensor receiver, allowing users to simply swap wheels and switch control signals. That's fine.

[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. , FIG. 4 is an operation time chart of FIG. 3. 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, 12: DA converter,
13: Subtraction circuit, 14: Power amplifier, 15:
Type selection drive unit, 16: Position signal generator, 1
7: speed signal generation circuit, 18: step signal generation circuit, 19: position signal switching circuit, 20: number of printed characters switching circuit, 21: multiplication circuit.

Claims (1)

[Claims] 1 Create a signal from the transducer attached to the type selection motor, count the initially set number of rotations of the type wheel using the above signal, output the speed level of the type wheel, 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 a speed signal from the speed level, a transducer having a resolution that is a common multiple of the stop positions on the circumference of two or more types of type wheels having different numbers of characters; A switching means for switching a multiplier a for the desired number of rotations N of the type wheel depending on the type of the type wheel, and a value corresponding to the type wheel, the desired number of rotations N of the type wheel counted by a signal from a transducer.
A printer characterized in that it is provided with conversion means for converting into aN.