JPH05294041A - Printer - Google Patents

Abstract

PURPOSE:To suppress the generation of noise even when printing due to a hammering system is performed. CONSTITUTION:Sound generating means 14, 17 provided in the vicinity of printing sound outlets and a control circuit 23 for controlling the operation of the sound generating means 14, 17 are provided to a printer. The control circuit 23 generates sound reverse to printing sound in phase and having magnitude equal to that of the printing sound in the sound generating means while printing sound generating timing coincides with the sound generating timing of the sound generating means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording printer, and more particularly to a printer which suppresses the generation of sound during a printing operation.

[0002]

2. Description of the Related Art With the recent development and popularization of OA equipment,
Printers are used as accessories for office computers and word processors in each office. There are various printing methods for such a printer, and an example of the structure of a printer head that employs a hammer striking method is, for example, as shown in FIG.

This recording head faces a front yoke 1 and a rear yoke 2 for forming an electromagnetic circuit, a permanent magnet 3 attached and fixed to one end of these yokes 1 and 2, and a permanent magnet 3. Between the core 4 fixed to the rear yoke 2 at a position, the electromagnetic coil 5 wound around the core 4 and electrically connected to the control circuit and the drive circuit, and the front yoke 1 and the permanent magnet 3. The leaf spring 6 is sandwiched between the leaf spring 6 and a printing pin 7 which is attached to the tip of the leaf spring 6 and constitutes a printing hammer together with the leaf spring. The front yoke 1 has a pin through hole 8 at the tip thereof, and the print pin 7 projects forward of the front yoke 1 through the pin through hole 8. Further, a second through hole 9 is provided in a portion (lower side position in FIG. 6) of the front yoke 1 on the slightly proximal end side of the pin through hole 8. And
A tip 10 is attached to a portion of the leaf spring 6 corresponding to the second through hole 9, and the tip 10 projects forward of the front yoke 1 through the second through hole 9. A plurality of sets (for example, 24 sets) of the magnetic members 3, 4, 5, the leaf springs 6, and the print pins 7 are provided for one recording head, and the tips of the print pins 7 for the number of sets face the platen surface. ing.

In such a structure, when no current is conducted to the electromagnetic coil 5, the leaf spring 6 is attracted to the core 4 by the magnetic action of the permanent magnet 3. In this case, the leaf spring 6
The gap between the front yoke 1 and the front yoke 1 is filled with the chip 10, and the magnetic flux density of the permanent magnet 3 does not decrease and reaches the rear yoke 2 from the front yoke 1 through the core 4.

On the other hand, when a timing pulse for a print command is output from the control circuit and the drive circuit operates, a current is passed through the electromagnetic coil 5 in a direction to cancel the magnetic flux of the permanent magnet 3. When a current is conducted to the electromagnetic coil 5 and the magnetic flux from the permanent magnet 3 is canceled, the leaf spring 6 becomes free accordingly, and the leaf spring 6 separates from the core 4 by its own repulsive force, and the printing pin 7 prints on the recording paper.

[0006]

However, in such a conventional printer, since the printing operation is performed by hitting the platen with a hammer, noise is generated, and the noise makes the office noisy. There was a risk of becoming.

The present invention has been made in view of the above problems, and an object thereof is to provide a printer capable of suppressing the generation of noise even when printing is performed by a striking method using a hammer or the like.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a printer with voice generating means and control means for causing the voice generating means to generate voice at a predetermined timing. And

[0009]

In the printing operation of the printer, printing is performed by the hammering operation of the hammer. The control means detects the striking motion by the hammer and operates the sound generating means with a delay of a certain time from the striking motion. Since the voice generation means generate various voices from high to low,
A plurality of them are provided to generate and output a sound having a phase opposite to that of a sound generated by a driving mechanism such as a hammer or a motor or a hammer and having the same magnitude. As a result, the sound generated from the hammer or the like and the sound output from the sound generating means cancel each other out, and the surroundings of the printer are kept quiet.

Embodiment FIG. 1 to FIG. 4 are views showing an embodiment of a printer according to the present invention. Of these, FIG. 1 is a perspective view of the embodiment. In this figure, reference numeral 11 is a printer main body, 12 is a key for inputting various operation instructions to the printer,
13 is an opening for inserting and ejecting recording paper, 14
Is a speaker as a sound generating means provided near the opening 13. FIG. 2 schematically shows the internal structure of this printer. Inside the printer, a recording head 15 similar to that shown in FIG. 5, and a platen 16 installed facing the recording head 15 are shown. Is provided. A speaker 17 is provided near the recording head 15 and the platen 16 in addition to the speaker 14. As the speaker 14, a speaker that emits a low tone is used so as to match a sound having a relatively low frequency, that is, a low tone generated from a motor portion of the printer, an operating portion of the platen 16, and the like. A speaker that emits a high-pitched sound is used so as to match a sound with a relatively high frequency generated during the printing operation, that is, a high-pitched sound.

FIG. 3 is a diagram showing an example of a control circuit for controlling the operations of the speakers 14 and 17 of the printer according to this embodiment. In this figure, reference numeral 21 is a buffer for temporarily storing the image data to be printed, and 22 is the recording head 1 which receives data from the buffer 21.
5 is a driver for performing a printing operation, and these operating parts execute a printing processing operation by a head drive signal.
As the head drive signal, image data for one line or image data for one line divided into a predetermined group is input as print data.

The control circuit 23 is roughly classified into a high-pitched speaker 1
7 is divided into a treble control section for controlling the operation and a bass control section for controlling the operation of the bass speaker 14. The treble control unit is connected to the output side of the buffer 21 and takes in image data to be transferred, and delays the transfer time of this image data, a delay circuit 24 that differentiates the output of the delay circuit 24, and a buffer. An OR gate 26 that takes the logical sum of the outputs of 21 and a filter 27 that shapes the waveform of the output signal of the OR gate 26.
And a signal inversion circuit 28 that inverts the filter output,
The gain circuit 29 that amplifies the inverted signal and the driver 30 that drives the high-pitched speaker 17 are included. The bass control section also shares the delay circuit 24, the differentiating circuit 25, and the OR gate 26 with the treble control section, and filters the output signal waveform of the OR gate 26.
1 and a signal inverting circuit 32 for inverting the filter output
A gain circuit 33 for amplifying the inverted signal, and a driver 34 for driving the high frequency speaker 14.

Further, in this printer, the counting circuit 35 for detecting the number of dot data to be printed in the head drive signal from the output of the buffer 21.
And a delay circuit 36 for time-adjusting the output of the counting circuit 35.
And a D / A conversion circuit 37 for converting a digital signal into an analog signal and inputting it to the gain circuits 29 and 33. A head drive timing signal is input to the counting circuit 35.

The operation of the printer having the above structure will be described below. In the printing operation, when the head drive signal is input to the buffer 21 in synchronization with the head drive timing signal, this signal is transferred to the driver 22 to drive the recording head 15 and print. This operation causes the printer to generate a print sound.

This print sound is shown in FIG.
As is clear from this figure, the print sound includes a high tone region component A and a low tone region component B. The delay circuit 24 takes in the head drive output signal outputted from the buffer 21, and the time from the recording operation of the recording head 15 to the actual generation of the printing sound and the time when the speakers 14 and 17 make a sound. Match the timing with. The signal pulsed by the differentiating circuit 25 is input to the OR gate 26, where it is checked whether or not there is image data to be printed in the head drive signal. If there is even one piece of data to be printed, the OR gate output is turned on and the speakers 14 and 17 are driven. OR gate 26
The output is branched and input to filters 27 and 31 so as to be divided into a high-pitched sound control unit and a low-pitched sound control unit, filtered by filters 27 and 31, respectively, and converted into a high-pitched sound signal and a low-pitched sound signal, and then a reversing circuit 28. , 32.

The inversion circuits 28 and 32 perform signal inversion processing so that the speaker output has a reverse phase with respect to the print sound. The inverted signal is amplified by the gain circuits 29 and 33, passes through the drivers 30 and 34, and the treble speaker 1
7. The sound is input to each of the bass speakers 14 and sounds are emitted. In parallel with this voice generation operation, the buffer 21
Is also input to the counting circuit 35. The head drive signal is also input to the counting circuit 35, and the number of data to be printed is included in the head drive signal transferred at each timing.
The output of the counting circuit is input to the delay circuit 36, whereby the timing of the print sound generation time and the timing of the sound generation of the speakers 14 and 17 are adjusted.

The output signal of the delay circuit 36 is D / A converted by the D / A conversion circuit 37, and then the gain circuit 2
It is input to 9 and 33 as a gain control signal.
As a result, when the head drive signal contains a large amount of data to be printed, a large amplification factor is input to the gain circuits 29 and 33. On the other hand, when the data to be printed included in the head drive signal is small, a small amplification factor is input to the gain circuits 29 and 33. As a result, the high-pitched loudspeaker 17 outputs a voice having a phase opposite to that of the print sound and having the same volume as shown in FIG. 4B.
Further, the low-pitched speaker 14 outputs a voice having a phase opposite to that of the print sound and having the same volume as shown in FIG. 4C. These voices emitted from the speakers 14 and 17 are synthesized with the actual print sound. As a result, the synthesized sound becomes almost 0 as shown in FIG.

As described above, according to the present invention, the control means is provided with the sound generating means provided in the vicinity of the printing sound outlet of the printer and the means for controlling the operation of the sound generating means. Since the sound generating means generates a sound having a phase opposite to that of the printing sound and having the same volume, an extremely quiet environment can be maintained even during the printing operation.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing an external structure of an embodiment of a printer according to the present invention.

FIG. 2 is a side view schematically showing the inside of the housing of the embodiment.

FIG. 3 is a block diagram showing an example of a speaker control circuit in the embodiment.

4A and 4B are waveform charts for explaining a speaker drive control operation in the above-described embodiment, in which FIG. 4A is a waveform chart of a print sound generated during a printing operation, and FIG. 4B is a waveform chart showing a sound generated by a high-pitched speaker. c) A waveform diagram showing a sound generated by a low-pitched speaker, and (b) a waveform diagram showing a synthesized sound of a sound generated by a high-pitched speaker and a low-pitched speaker and a print sound.

FIG. 5 is a side sectional view showing an example of a recording head adopted in a printer to which the present invention is applied.

[Explanation of symbols]

 14 high-tone speaker 15 recording head 16 platen 17 low-tone speaker 21 buffer 22 driver 23 control circuit (control means) 24 delay circuit 27, 31 filter 28, 32 inverting circuit 29, 33 gain circuit 35 counting circuit 36 delay circuit 37 D / A conversion circuit

Claims (2)

[Claims] 1. A recording head for recording by a striking operation, a platen provided so as to face the recording head, and a drive mechanism for reciprocating the recording head along the platen.
In a printer having a housing for accommodating these actuating members, the printer comprises a sound generating means provided in the vicinity of a print sound outlet and a means for controlling the operation of the sound generating means, and the control means is a sound generating means, In opposite phase to the printing sound,
A printer that produces sounds of equal volume. 2. The printer according to claim 1, wherein the sound generating means comprises a high-frequency speaker installed near the recording head and a low-frequency speaker installed in the housing.