JPH0577523A - Printer - Google Patents

Abstract

PURPOSE:To reduce electric capacity and to minimize the generation of printing operation sound by operating a plurality of the operation elements of a recording head so that one recording element is operated and, during the next operation of said element, the operation of the other recording element is completed with a time lag. CONSTITUTION:At the time of the printing operation of a recording head, the printing data of a plurality of characters are transmitted in synchronous relation to the scanning of recording dots and (m) printing pins 7 arranged in a vertical direction are started. An A-row and a B-row of pins 7 are arranged at an interval shifted by a predetermined dimension P/m from the multiple nP (n: arbitrary natural number) of a printing pitch P in a main scanning direction and, since the printing pins mutually adjacent in the same row are arranged at a 2 P/m pitch interval in the main scanning direction, when the moving speed of the recording head is set to V, a plurality of printing pins 7 reach a printing position individually and separately in the order of pins 7a...7m with a time lag P/mV and, as a result, printing command timing pulses are outputted at every pins 7a...7m in a dispersed state.

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 capable of reducing the capacity of a power source used and suppressing 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 of such a printer, and as an example of the structure of the recording head of the printer that employs the hammer striking method, there is one shown in FIG. 14, for example.

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. 14) of the front yoke 1 on the slightly proximal end side of the pin through hole 8. A tip 10 is attached to the 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 of the magnetic members 3, 4, 5, the leaf spring 6, and the printing pin 7 are provided for one recording head (for example, 24 sets).
Sets), and the tips of the print pins 7 for the number of sets face the platen surface.

The print pins 7 have an arrangement as shown in FIG. 15 as an example when viewed from the front of the recording head. The recording head according to this example has a 24-dot configuration,
Twelve print pins 7 are arranged at equal intervals in the vertical direction at the front end portion, and are arranged in two lines in the horizontal direction (main scanning direction) along with the print pin lines L1 and L2. Between the first print pin row L1 and the second print pin row L2, the print pins 7 of one row and the marking pins 7 of the other row are arranged vertically offset from each other by a half pitch. Adjacent print pins between both print pin rows (eg print pins 7a and 7b)
One printing pitch (denoted as P) in the sub-scanning direction is formed between them. The interval between the first print pin row L1 and the second print pin row L2 in the main scanning direction is set to an integral multiple nP of one print pitch. In addition, in FIG. 15, reference symbol B indicates a base plate which is installed further forward of the front yoke 1 of the recording head. The print pin 7 projects from the rear side of the base plate B toward the front side of the base plate B. Then, the base plate B is formed with through holes corresponding to the arrangement of the print pins 7, through which the print pins 7 are inserted.

In such a structure, when the electric current is not 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, during the operation of the recording head, every time the recording head moves by one printing pitch in the main scanning direction, the operation circuit has a timing pulse as shown in FIG. As a result, the drive circuit operates and a current is passed through the electromagnetic coil 5. When a current is applied to the electromagnetic coil 5, the electromagnetic coil 5 is excited and the magnetic flux generated by the permanent magnet 3 is canceled. As a result, the leaf spring 6 becomes free and is separated from the core 4 by its own repulsive force, and the printing pin 7 prints on the recording paper. When the electric current to the electromagnetic coil 5 is cut off, the leaf spring 6 is again moved to the permanent magnet 3
Is attracted to the surface of the core 4. Since the print pins 7 are arranged at the print pin row interval of nP in the main scanning direction as described above, all the print pins 7 arrive at the print position at the same time, and the output of one timing pulse causes 24 All of the print pins 7 operate simultaneously. By repeating this operation every time the recording head moves by one printing pitch P in the main scanning direction, a dot matrix as shown in FIG. 17 is formed on the recording paper.

[0007]

However, in such a conventional recording head using the hammer striking method, as described above, the output of one timing pulse is 24
Since all the print pins 7 of the book have to be driven at the same time, it is necessary to increase the power supply capacity of the drive circuit to supply a large amount of electric power, which causes a problem that the device becomes large and the cost increases. In addition, the printing pin 7
There was a problem that loud sound was generated by simultaneous driving.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a recording head which has a small power supply capacity and which can minimize the generation of sound during a printing operation. Is.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a printer with a sound generating means, and the sound generating means is provided with a sound having a phase opposite to that of a sound generated during operation of the printer. A plurality of recording elements of the recording head are arranged at a pitch interval deviating from the multiple of the printing pitch P in the main scanning direction by a predetermined dimension, and one recording element operates to The gist is to complete the operation while causing a time difference in other recording elements during the operation of.

[0010]

In the printing operation of the printer, printing is performed by the hammering operation of the hammer. As described above, since the plurality of recording elements are arranged at a pitch interval that is deviated from the multiple of the printing pitch P in the main scanning direction by a predetermined dimension, the plurality of recording elements are arranged during the movement of the recording head in the main scanning direction. The print command timing pulse reaching each print position individually is dispersed for each print element such that one print element operates and the other print element completes its operation while causing a time difference while performing the next operation. Is output. For this reason, the power for driving the printhead is also dispersedly supplied, and a large amount of power supply is not required at one time, so that the capacity of the power supply circuit can be reduced. Further, since the plurality of recording elements are dispersed to perform the printing operation, the sound generated during the printing operation is extremely small.

Further, in order to cancel the beat noise which is further generated after the volume is lowered by the distributed printing operation in this way, the control means detects the hammering motion by the hammer and is more constant than the hammering motion. The voice generating means is operated with a time delay. Since the sound generating means generates various sounds from high-pitched to low-pitched sounds, a plurality of them are provided, and 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 is generated. Is output. 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.

[0012]

1 and 2 are views showing the mechanical construction of a printer according to the present invention. Of these, FIG. 1 is a perspective view of the printer. In this figure, reference numeral 11 is a printer main body, 12 is a key for inputting various operation instructions to the printer, and 13 is an opening through which recording paper is inserted and ejected. FIG. 2 schematically shows the internal structure of this printer. Inside the printer, a speaker 14 as a sound generating means, a recording head 15 similar to that shown in FIG. 5, and this recording head 15 are shown. And a platen 16 installed to face each other. A speaker 17 is provided near the recording head 15 and the platen 16 in addition to the speaker 14. The speaker 14 includes a motor portion of the printer and a platen 16
Sound with relatively few frequencies generated from the operating parts of
That is, a speaker that emits a low tone is used so as to match the low tone, while a speaker that emits a high tone is used as the speaker 17 so as to match a relatively high frequency sound generated during the printing operation of the recording head 15, that is, a high tone. .. The high-pitched speaker 17 is placed on the recording head 15, and even if the position changes due to the movement of the recording head 15 in the main scanning direction, it is possible to always emit sound from the position of the recording head 15. There is. The recording head 15 has the same structure as that shown in FIG.

3 and 4 are views showing a first embodiment of the print pin arrangement of the recording head according to the present invention. In this embodiment, the print pin 7 is, as shown in FIG.
m rows from a to 7 m are provided, and the plurality of printing pins 7 a to 7 m are slightly inclined and extend in the vertical direction in rows A and B.
It is arranged in two columns. Between row A and row B, the print pins 7a, 7c, ... 7m-1 of one row and the print pins 7b, 7d, ... 7m of the other row are staggered in the vertical direction by a half pitch and staggered. , And one print pitch P in the sub-scanning direction is formed between adjacent print pins (for example, 7a and 7b) between both print pin rows.

Further, in the row A, the adjacent print pins (for example, 7a and 7c) are arranged with a pitch of 2 P / m in the main scanning direction. The same print pin arrangement is made in the row B as well.

Further, the main scanning direction interval between the print rows A and B is nP + P / m, where n: an arbitrary natural number P: print pitch on the recording paper.

The operation of the recording head having such a print pin array will be described below. In the printing operation, the print data for a plurality of characters is transferred in synchronization with the scanning of the recording head, and the plurality of print pins 7 arranged in the vertical direction are activated. As described above, the rows A and B in which the printing pins 7 are arranged are arranged at intervals of a predetermined dimension P / m from the multiple nP of the printing pitch P in the main scanning direction, and within the same row. Since adjacent print pins are arranged in the main scanning direction at a pitch interval of 2 P / m, the plurality of print pins 17 set the moving speed of the print head to V while the print head is moving in the main scanning direction. Then, with the time difference of P / mV, the print pins 7a, 7b, 7c, ...
Each of the print pins 7a to 7m reaches the print position in the order of 7m-1 and 7m, and as a result, the print command timing pulse is applied to the print pins 7a to 7m.
It is distributed for every m and output.

FIG. 4 shows an example of the operation timing of the print pin 7 when it is activated. In FIG. 4, when the encoder output E1 is sent from the control circuit, 7a, 7a are sent to the recording head for the m print pins.
b, 7c, ... 7m-1, 7m are dispersed in this order, and print command timing pulses are applied to start up. In this embodiment, the printing operation when m = 24 is shown. As a result, the print pin 7a first reaches the predetermined print position, the print command timing pulse is applied, and the print operation is performed on the recording paper, and then the print pin 7b reaches the print position with a time difference of P / mV. Similarly, a print command timing pulse is applied to perform a printing operation on the recording paper. Hereinafter, this operation is continuously continued for the remaining print pins. Then, after the last print pin 7m finishes the printing operation, the next encoder output E2 is sent out where the first print pin 7a has advanced by one print pitch P from the previous print position, and the next encoder output E2 is sent in the same manner as above. Distributed printing operation is performed. By repeating this operation, a dot matrix as shown in FIG. 17 is obtained. The operation of the magnetic drive member and the like when the printing pin 7 performs printing is almost the same as that described in the conventional example.

FIGS. 5 and 6 are views showing a second embodiment of the print pin arrangement of the recording head according to the present invention in which the print pin arrangement is different from that of the first embodiment. Also in this embodiment, as in the first embodiment, the print pins 7 are
m rows from a to 7 m are provided, and the plurality of printing pins 7 a to 7 m are slightly inclined and extend in the vertical direction in rows A and B.
It is arranged in two columns. Further, between row A and row B, the print pins 7a, 7c, ... 7m-1 of one row and the print pins 7b, 7d, ... 7m of the other row are vertically displaced from each other by a half pitch. And the print pins adjacent to each other between both print pin rows (for example, 7a and 7a).
One print pitch P in the sub-scanning direction is formed between b).

However, unlike the first embodiment, in this embodiment, as shown in FIG. 4, the print pins 7a, 7c, ... Are offset by a pitch of P / m. Even in the B row, the print pins 7b, 7d, ... 7m are arranged in the same manner as in the A row.

Further, between the rows A and B, the interval in the main scanning direction between the last pin 7m-1 of the row A and the first pin 7b of the row B is set to nP + P / m.

The operation of the recording head having such a print pin array will be described below. As described above, the print pins 7 are arranged at a pitch interval of P / m in the main scanning direction in the same row, and between the rows A and B,
The final pin 7m-1 of the row and the first pin 7b of the row B are a predetermined dimension P / m from the multiple nP of the printing pitch P in the main scanning direction.
Since the plurality of print pins 7 have a time difference of P / mV when the moving speed of the recording head is V while the recording head is moving in the main scanning direction, the plurality of printing pins 7a, 7a, 7c, ... 7m-1,7
b, 7d, ... 7m in order, individually reaching the print position,
As a result, the print command timing pulse is applied to each print pin 7a ...
It is distributed and output every 7 m.

FIG. 6 shows an example of the operation timing of the print pin 7 when it is activated. In FIG. 6, when the encoder output E1 is sent from the control circuit, 7a, 7
.. 7m-1, 7b, 7d ,. As a result, the print pin 7a first reaches the predetermined print position, the print command timing pulse is applied, and the print operation is performed on the recording paper, and then the print pin 7c reaches the print position with a time difference of P / mV. Similarly, a print command timing pulse is applied to perform a printing operation on the recording paper. Hereinafter, this operation is continuously continued for the remaining print pins. Then, after the last print pin 7m finishes the printing operation, the next encoder output E2 is sent out where the first print pin 7a has advanced by one print pitch P from the previous print position, and the next encoder output E2 is sent in the same manner as above. Distributed printing operation is performed. By repeating this operation, a dot matrix as shown in FIG. 17 is obtained.

In the above-mentioned two embodiments, 24 print pins are arranged in two rows that are slightly inclined and extend in the vertical direction, but this arrangement may be one row or three rows. It may be arranged in rows or more.

FIG. 7 is a diagram showing a third embodiment of the print pin arrangement of the recording head according to the present invention. In this example,
As shown in FIG. 7, there are m (24 in the figure) print pins 7 from 7A to 7M, and a predetermined tilt angle θ1 is formed in the scanning direction of the recording head behind the base plate B in the scanning direction. They are arranged in a straight line. In FIG. 7, the right part is the front part and the left part is the rear part in the figure. The print pin 7 has a pitch in the main scanning direction from the frontmost print pin 7A to the rearmost print pin 7M in the inclined column direction, nP + P / m, where m: the number of print pins, n: an arbitrary natural number P: on the recording paper Print pitch P is arranged at equal intervals in the sub-scanning direction.

The operation of the recording head having such a print pin array will be described below. In the printing operation, the print data for a plurality of characters is transferred in synchronization with the scanning of the recording head, and the plurality of print pins 7 arranged obliquely are activated. Therefore, regarding the case where characters are printed by the recording head, among the plurality of printing pins 7, there are a printing pin 7A at the front side in the scanning direction of the recording head and a printing pin 7M at the rear side in the scanning direction of the recording head. Between the two, the characters to be printed are in a relationship in which they are offset from each other in the front-back direction. Focusing on the printing operation of one character, among the plurality of printing pins, printing is started by passing the printing pin 7A at the foremost part in the scanning direction of the recording head, and the printing pin 7M at the last part in the scanning direction of the recording head is started. The printing of the character is completed by passing. When this printing is completed, the print pin 7A at the forefront of the recording head is printing another character further forward, or has finished the printing operation for that line.

In such a printing operation, the plurality of printing pins 7 are arranged at a pitch interval deviated from the multiple nP of the printing pitch P by a predetermined dimension P / m in the main scanning direction as described above. While the recording head is moving in the main scanning direction, the plurality of print pins 7 are individually arranged in the order of 7A, 7B, 7C, ... 7M with a time difference of P / mV, where V is the moving speed of the recording head. When the print position is reached, as a result, the print command timing pulse is dispersed and output for each print pin 7A to 7M.

The same timing as that shown in FIG. 4 is used as the operation timing when the print pin 7 is activated. That is, when the encoder output E1 is sent from the control circuit, the print command timing pulses are applied to the print head in the order of 7A, 7B, 7C ,. Be done. As a result, the print pin 7A first reaches the predetermined print position, the print command timing pulse is applied, and the print operation is performed on the recording paper. Then, the print pin 7B reaches the print position with a time difference of P / mV. Similarly, a print command timing pulse is applied to perform a printing operation on the recording paper. Hereinafter, this operation is continuously continued for the remaining print pins. And the last printing pin 7M
After the end of the printing operation, the next encoder output E2 is sent out when the first printing pin 7A advances by one printing pitch P from the previous printing position, and the next distributed printing operation is performed in the same manner as above. . By repeating this operation, as shown in FIG.
A dot matrix as shown in is obtained.

In the third embodiment, the print pins 7 of the recording head are linearly arranged in a line in the scanning direction of the recording head with a predetermined inclination angle of θ1 with respect to the scanning direction. Although the example attached to B is shown, various changes and modifications can be made to the arrangement structure of the printing pins. For example, on the base plate B, the printing pins 7 are linearly inclined and arranged as described above, and
It may be divided into two or more rows.

FIG. 8 is a diagram showing a fourth embodiment of the print pin arrangement of the recording head according to the present invention. In this example,
As shown in FIG. 8, the recording head has a long print pin block 20 which supports the print pins 7 and covers the width dimension of the recording paper to be printed. And the print pin 7 is
The print heads 20 are arranged in a straight line in the longitudinal direction on the print block 20 at a predetermined pitch length S at a ratio of a predetermined number of dots (for example, 9 dots) of the recording head 15. In FIG. 8, when the right direction is the front, the printing pin 7
From the frontmost printing pin 7a to the last printing pin 7g, the pitch length is S = nP + P / m, where m is the total number of dots printed by the printing pin 7, n is any natural number, and P is the printing pitch. Are evenly spaced. This pitch length (nP
+ P / m) contains 9 dot points, and these 9 dot points are set to be printed by one printing pin 7a, 7b, ... 7g.

The operation of the recording head having such a print pin array will be described below. During the printing operation, print data for a plurality of characters is transferred to the recording head in synchronization with the scanning of the recording head. The recording head moves in the main scanning direction, and during this movement, a print command timing pulse is applied to the print pin 7 to activate it.
Print. Since the plurality of printing pins 7 linearly arranged in the main scanning direction have a pitch interval of (nP + P / m), the plurality of printing pins 7 are not moved during the movement of the recording head in the main scanning direction. Assuming that the moving speed of the recording head is V, each print position is individually reached with a time difference of P / mV. Therefore, the print command timing pulses are dispersed and output to the individual print pins 7a ... 7g in the order of reaching the print position. And all the printing pins 7 are 5
When the dots are printed, the printing of one line is completed, and then the recording paper is fed by one printing pitch P in the sub-scanning direction. When the recording paper is fed, the recording head moves again in the main scanning direction, and the same printing operation as above is performed.
By repeating this operation, a dot matrix as shown in FIG. 17 is obtained.

In the above four embodiments, a hammer striking type recording head using a printing pin as a recording element has been described, but the present invention can be applied to a wire dot type recording head in addition to this. You can Further, as for the arrangement of the print pins, the print heads of various print pin arrangements can be applied in addition to the vertical arrangement, the horizontal arrangement, and the inclined arrangement described above.

Furthermore, in the examples of the respective print pin arrangements, as an example in which one print pin operates and another print pin completes its operation with a time lag until the next operation, There is an example in which the print pins are all dispersed and operated, but this is shown as the best example for reducing the generation of print noise. Therefore, not all the print pins work one by one,
For example, even if a distributed operation is performed such that the print pins are operated two by two (partial dispersion), the object of the present invention of preventing the generation of sound is sufficiently achieved.

With the recording head configuration as described above, it is possible to greatly reduce the generation of sound due to the operation of the recording head. However, it is generated to further minimize the generation of sound or reduce it to zero. A circuit is provided to cancel the sound made.

FIG. 9 is a diagram showing a basic circuit configuration example of the printer of the present invention. In this figure, reference numeral 21 is a buffer for temporarily storing a head drive signal generated based on image data to be printed, and 22 is a buffer 2.
1 is a driver for receiving a data transfer from the print head 15 to perform a print operation, and these operating parts execute a print 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. Reference numeral 23 is a control circuit for controlling the operation of the speaker S. This control circuit 23 generates a reverse print sound that generates a sound of the same magnitude in a phase opposite to the print sound of the recording head based on the head drive timing signal a. It is composed of a circuit 23a and a driver 23b for operating the speaker S. As the speaker S, the bass speaker 14 and the treble speaker 17 shown in FIG. 2 correspond.

FIG. 10 is a diagram showing a first embodiment of the control circuit 23. The control circuit 23 according to this embodiment is used to control the sound erasing in the recording head 15 of the type that performs simultaneous printing on a plurality of printing pins 7. In this embodiment, the control circuit 23
Are roughly divided into a high-pitched sound control unit that controls the operation of the high-pitched sound speaker 17 and a low-pitched sound control unit that controls the operation of the low-pitched sound speaker 14. The common part of the high-pitched sound control unit and the low-pitched sound control unit is connected to the output side of the buffer 21, and the OR gate 26 that takes the logical sum of the outputs of the buffer 21 and the delay circuit 24 that delays the transfer time of the output data of the OR gate 26. Composed of and. The treble control unit includes a filter 27 that shapes the waveform of the output signal of the delay circuit 24, a signal inverting circuit 28 that inverts the filter output, a gain circuit 29 that amplifies the inverted signal, and a treble speaker 17. Driver 30 to drive
It consists of and. The bass controller drives the filter 31 that shapes the waveform of the output signal of the delay circuit 24, the signal inverting circuit 32 that inverts the filter output, the gain circuit 33 that amplifies the inverted signal, and the bass speaker 14. And a driver 34.

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. The head drive timing signal a is supplied to the counting circuit 35.
Is entered. The head drive timing signal a is also input to the buffer 21.

The operation of the control circuit according to the first embodiment 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 a, this signal is transferred to the driver 22 to drive the recording head 15 to perform printing. This operation causes the printer to generate a print sound.

This printing sound is shown in FIG. 11 (a). 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 is
By taking the logical sum output of the head drive signals output from the buffer 21, the time from the recording operation of the recording head 15 until the actual print sound is generated and the time at which the speakers 14 and 17 emit a sound. Adjust the timing. The output of the delay circuit 24 is branched and input to the filters 27 and 31 so as to be divided into a high-pitched sound control unit and a low-pitched sound control unit, and filtered by the filters 27 and 31, respectively, and converted into a high-pitched sound signal and a low-pitched sound signal. After that, it is input to the inversion circuits 28 and 32.

The inversion circuits 28 and 32 perform signal inversion processing so that the speaker output has an opposite phase 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 2
The output of 1 is also input to the counting circuit 35. Counting circuit 35
A head drive signal is also input to the device, 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 treble speaker 17 outputs a voice having a phase opposite to that of the treble component A of the print sound and having the same volume as shown in FIG. As shown in (c), a voice having a phase opposite to that of the low tone component B of the print sound and having the same volume is emitted. In particular, the high-pitched speaker 17 is placed on the recording head 15 and moves together with the movement of the recording head 15 in the main scanning direction. Therefore, it is possible to always emit a sound of opposite phase from the position of the recording head 15. Great muffling effect. These speakers 1
The voices emitted from Nos. 4 and 17 are synthesized with the actual print sound. As a result, the synthesized sound becomes almost 0 as shown in FIG.

FIG. 12 is a diagram showing a second embodiment of the control circuit 23 shown in FIG. The control circuit 23 according to this embodiment is used to control the sound erasing in the recording head 15 of the type that performs divided printing on the plurality of printing pins 7. Also in this example,
The control circuit 23 is divided into a treble control section and a bass control section, as in the first embodiment. The common part of the treble control unit and the bass control unit is connected to the output side of the buffer 21,
A delay circuit 24 that takes in the head drive signal to be transferred and delays the transfer time of the head drive signal, and a differentiating circuit 2 that differentiates the output of the delay circuit 24
OR gate 2 which takes the logical sum of 5 and the output of the buffer 21
6 and 6. The high-pitched sound control unit and the low-pitched sound control unit have the same configurations as those in the first embodiment.

The operation of the control circuit according to the second embodiment 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 a, this signal is transferred to the driver 22 to drive the recording head 15 to perform printing. Since the head drive signal is input and transferred separately for a plurality of print pins 7, the print pins 7 in the recording head 15 operate with a certain timing deviation to perform division printing. In this divisional printing, the print command timing pulse is applied at a predetermined time interval to the predetermined print pins 7 in order, and the printing operation starts in the order in which the print command timing pulse is applied. As a result, in the case of division printing, for example, the frequency is 109.3.
High-frequency, low-level volume print sound of 5 kHz and volume level Lo is generated. Therefore, as shown in (a) of FIG. 11, compared with the level (maximum peak) of the print sound when a plurality of print pins 7 start the print operation all at once, in the case of divided print, As shown in (a), the printing sound becomes low level Lo, and the volume can be reduced to some extent.

The delay circuit 24 takes in the head drive signal output from the buffer 21, and the time from when the recording head 15 performs a printing operation to when a printing sound is actually generated and the speakers 14 and 17 produce a sound. Match the timing with the time of departure. The signal pulsed by the differentiating circuit 25 is input to the OR gate 26, where it is checked whether or not there is data to be printed in the head drive signal. If there is even one piece of data to be printed, the output of the OR gate 26 is turned on and the speakers 14 and 17 are driven.

The output of the OR gate 26 is branched and input to filters 27 and 31 so as to be divided into a high tone control section and a low tone control section, and filtered by the filters 27 and 31, respectively, and converted into a high tone sound signal and a low tone sound signal. Then, it is input to the inverting circuits 28 and 32. The inversion circuits 28 and 32 perform signal inversion processing so that the speaker output has the opposite phase to the print sound. The inverted signals are amplified by the gain circuits 29 and 33. At this time, when the head drive signal includes 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. Then, the amplified inverted print sound signal is input to the high-pitched speaker 17 and the low-pitched speaker 14 via the drivers 30 and 34, and a voice is emitted. As a result, the high-pitched speaker 17 and the low-pitched speaker 14 emit a voice having a phase opposite to that of the print sound and having the same volume, as shown in FIG. 13B. In particular, the high-pitched speaker 17 is placed on the recording head 15 and moves together with the movement of the recording head 15 in the main scanning direction. Therefore, it is possible to always emit a sound of opposite phase from the position of the recording head 15. Great muffling effect. These voices emitted from the speakers 14 and 17 are combined with the actual print sound. As a result, the synthesized sound becomes almost 0 as shown in FIG.

In the above description, the high-pitched loudspeaker 17 and the low-pitched loudspeaker 14 are separately prepared as the loudspeaker S that emits the reverse printing sound, and the high-pitched loudspeaker 17 is placed on the recording head 15 while the low-pitched loudspeaker 17 is placed. Although the speaker 14 is attached to the main body of the printer, differently from this, the high-pitched speaker and the low-pitched speaker may be integrated and the integral speaker may be attached to the recording head 15.

[0046]

As described above, according to the present invention, since the plurality of recording elements of the recording head are arranged at the pitch intervals deviating from the multiple of the printing pitch in the main scanning direction by a predetermined dimension, the main scanning of the recording head is performed. During the movement in the direction, the plurality of recording elements individually reach the print position, and the print command timing pulse is distributed and output for each recording element. For this reason, the power for driving the printhead is also dispersedly supplied, and a large amount of power supply is not required at one time, so that the capacity of the power supply circuit can be reduced. Further, since the plurality of recording elements are dispersed to perform the printing operation, it is possible to obtain the effect that the sound generated during the printing operation is extremely small.

Further, according to the present invention, the sound generating means is provided on the recording head of the printer, and the means for controlling the operation of the sound generating means is provided. Since the sound of the same magnitude is generated in the opposite phase, 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 a printer according to the present invention.

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

FIG. 3 is a front view showing a first embodiment of a print pin arrangement of a recording head used in the printer.

FIG. 4 is a diagram showing an example of operation timings of print pins in the embodiment.

FIG. 5 is a front view showing a second embodiment of the print pin arrangement of the recording head used in the printer.

FIG. 6 is a diagram showing another example of the operation timing of the print pin in the second embodiment.

FIG. 7 is a front view showing a third embodiment of a marking pin arrangement of a recording head used in the printer.

FIG. 8 is a front view showing a fourth embodiment of the print pin arrangement of the recording head used in the printer.

FIG. 9 is a diagram showing a basic circuit configuration example of the printer.

FIG. 10 is a block diagram showing a first embodiment of a speaker control circuit of the printer.

11A and 11B are waveform diagrams illustrating a speaker drive control operation in the first embodiment, including (a) a waveform diagram of a print sound generated during a printing operation, and (b) a waveform showing a sound generated by a high-pitched speaker. FIG. 6 (c) is a waveform diagram showing a sound generated by a low-pitched speaker, and (b) is 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. 12 is a block diagram showing a second embodiment of the speaker control circuit of the printer.

13A and 13B are waveform charts for explaining the speaker drive control operation in the above-described embodiment, including (a) a waveform chart of a print sound generated during a printing operation, and (b) a sound generated from a high-pitched speaker and a low-pitched speaker. FIG. 4C is 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. 14 is a side sectional view showing an example of a recording head adopted in a printer to which the present invention is applied.

FIG. 15 is a front view showing an example of a conventional print pin arrangement of the recording head.

FIG. 16 is a diagram showing an example of operation timings of print pins in the conventional example.

FIG. 17 is a diagram showing a dot matrix printed on a recording sheet by a recording head.

[Explanation of symbols]

 1 Front Yoke 2 Rear Yoke 3 Permanent Magnet 4 Core 5 Electromagnetic Coil 6 Leaf Spring 7 Printing Pins 8, 9 Through Hole 10 Chip 11 Printer Main Body 12 Key 13 Opening 14 High Sound Speaker 15 Recording Head 16 Platen 17 Bass Speaker 21 Buffer 22 Driver 23 Control circuit (control means) 24 Delay circuit 27, 31 Filter 28, 32 Inversion circuit 29, 33 Gain circuit 35 Counting circuit 36 Delay circuit 37 D / A conversion circuit

Claims (5)

[Claims] 1. A recording head having a plurality of recording elements for recording by a striking operation while moving in the main scanning direction on a recording paper, a platen provided facing the recording head, and a platen for the recording head. In a printer having a driving member that reciprocates along the path and causes a recording element to perform a printing operation, and a housing that accommodates these operating members, a sound generating unit that is placed on the recording head and moves with the recording head, The sound generating means is provided with a control means for sending a sound signal, and the plurality of recording elements of the recording head are arranged at a pitch interval deviated from the multiple of the printing pitch in the main scanning direction by a predetermined dimension, and the driving member is , For each recording element that has reached the printing position during the movement of the recording head in the main scanning direction, one recording element operates until the next operation. Printer recording elements divided drive to operate completed while generating a time difference, which the control means is voice generating means, in printing noise and antiphase by the recording head, characterized in that to output magnitude equal sound. 2. The printer according to claim 1, wherein the divisional driving of the recording heads is performed by grouping together two or more recording elements. 3. A sound generating means other than the sound generating means mounted on the recording head is attached to the housing,
2. The printer according to claim 1, wherein the sound generating means mounted on the recording head comprises a high-pitched speaker, while the sound generating means mounted on the housing comprises a low-pitched speaker. 4. The printer according to claim 1, wherein both the high-pitched sound speaker and the low-pitched sound speaker are incorporated in the sound generating means mounted on the recording head. 5. The printer according to claim 1, wherein, in addition to the sound generating means mounted on the recording head, a sound generating means is provided for each sound generating source of the printer.