JPH06190178A - Pedal device and controller, and sewing machine provided with them - Google Patents

Abstract

PURPOSE:To arbitrarily select and connect even the pedal device using either a CCD sensor or an encoder as a pedal sensor, and also, to detect abnormality of the pedal sensor and falling-out of a connector or a contact failure. CONSTITUTION:The pedal device is provided with a CCD sensor 36, and a connector 43 for connecting it to a controller 5 of the sewing machine, and provided with a data output terminal for outputting step-in amount data, a first deciding terminal connected to an earth, and a second deciding terminal for outputting a CCD clock, in its connector 43. In the case of using encoder instead of the CCD sensor 36, a first deciding terminal of the connector is opened, and a second deciding terminal is grounded. On the controller side, a state transition of these first and second deciding terminals is discriminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pedal device for generating stepping amount data of a sewing machine pedal, a controller for controlling a rotation speed of a sewing machine motor for rotating a sewing machine spindle according to the stepping amount data, and a connector for connecting them. The present invention relates to a sewing machine electrically connected to the sewing machine.

In an electric sewing machine, a sewing machine motor rotates a sewing machine main shaft for sewing, and a pedal device operated by a worker is provided to control a rotation speed of the sewing machine motor, that is, a sewing speed. . The pedal device has a pedal sensor, senses the amount of depression of the sewing machine pedal, and outputs data corresponding to the amount of depression to the controller. The controller determines the rotation speed of the sewing machine motor according to the data.

Therefore, when the pedal sensor is abnormal,
There is a danger that the sewing machine will not sense even if the sewing machine pedal is depressed, or the sewing machine will not move, or conversely, the sewing machine will start to move even if the sewing machine pedal is not depressed, causing the sewing machine to move out of control and becoming a dangerous situation. .

For example, the sewing machine does not operate when the connector for connecting the sensor portion of the pedal system to the controller is disconnected. If the connector is clearly disconnected, the operator will notice, but if the connector is apparently connected but there is poor contact, it will not be connected or connected, resulting in a problem that the sewing machine sometimes does not work. .

A CCD (Charge Coupl) is used as a pedal sensor.
ed Device) sensor, it is possible to repeat the reading of data at a constant cycle, and since it becomes absolute position information, even if the contents of the reading counter (data of the depression amount) are destroyed by noise, The correct data can be replaced in the next cycle without returning the pedal to the neutral position. Further, the CCD has advantages such as a fine image element pitch (7 to 35 μm) and high resolution, and is excellent in reliability and performance.
A little expensive in terms of system.

On the other hand, when an incremental encoder or an absolute encoder is used as the pedal sensor, the neutral position (neutral position) is set to "0", and the slit number is electrically added / subtracted in relation to the operation direction and operation amount of the sewing machine pedal. Therefore, the addition / subtraction counter may malfunction due to external noise or the like, but the reliability is slightly inferior, but the system becomes inexpensive.

[0007]

In the conventional sewing machine, which system is used as the pedal sensor of the pedal device is fixed, and an expensive system that requires reliability and a system that prioritizes cost are used. However, there was a problem that the controller (control device) of the sewing machine had to be made separately, because it was not possible to select. Further, as described above, if the pedal sensor is abnormal, or the connector for connecting the pedal device to the controller is disconnected or the contact is poor, the sewing machine may be out of control and may run out of control or may not operate. .

The present invention has been made in view of the above points, and it is possible to arbitrarily select a system using a CCD sensor, an incremental encoder, or an absolute encoder as a pedal sensor of a pedal system. To prevent the runaway of the sewing machine and inoperability of unknown cause from occurring by allowing the controller side to determine whether the connector of the pedal sensor is missing or the contact is defective. With the goal.

[0009]

In order to achieve the above object, the present invention comprises a CCD sensor for detecting the amount of depression of the sewing machine pedal and generating a detection signal, and a connector for connecting to a controller of the sewing machine. In a pedal device of a sewing machine, a data output terminal of a predetermined bit for outputting stepping amount data based on a detection signal of a CCD sensor, a first determination terminal in a state in which the connection of the CCD sensor can be identified, to the connector. Provided is a pedal device of a sewing machine provided with a second judgment terminal for outputting a clock pulse for data latch of a CCD sensor.

Further, in a pedal device of a sewing machine including an encoder for detecting a stepped-on amount of a sewing machine pedal to generate a detection signal, and a connector for connecting to a controller of the sewing machine, the detection signal of the encoder is connected to the connector. A data output terminal of a predetermined bit for outputting the depression amount data based on the above, a first judgment terminal in a state different from the state in which the connection of the CCD sensor can be discriminated, and a constant voltage level is output or opened. Also provided is a pedal device for a sewing machine in which a second determination terminal is provided, and at least one of the first and second determination terminals is not opened.

Further, the sewing machine is provided with a connector which can be connected to the connector of the pedal device of any of the above-mentioned sewing machines, and means for controlling the rotation speed of the sewing machine motor in accordance with the depression amount data inputted through the connector. In the controller, the connector is provided with a data output terminal of the connector of the pedal device and a data input terminal and first and second determination connection terminals respectively connected to the first and second determination terminals. At the same time, the state transition of the first and second connection terminals for determination is detected, and the presence or absence of connection of the pedal device, the type of sensor of the connected pedal device, and the presence or absence of abnormality of the CCD sensor are determined from the combination thereof. A controller of the sewing machine provided with the judging means is also provided.

Further, a pedal device in which at least one of a CCD sensor and an encoder for detecting the amount of depression of the sewing machine pedal and generating a detection signal can be arranged, and the amount of depression data based on the detection signal from the pedal device is used. Accordingly, there is also provided a sewing machine in which the rotation speed of the sewing machine motor is electrically connected to the controller by a connector.

The connector of the pedal device has a data output terminal of a predetermined bit for outputting stepping amount data based on a detection signal of the CCD sensor or the encoder, a state in which the CCD sensor is connected and a state in which the encoder is connected or nothing is connected. Outputs a clock pulse for the data latch when the first determination terminal and the CCD sensor that can identify the non-operation state and the CCD sensor are arranged, and outputs a constant voltage level when the encoder is arranged. Or a second determination terminal which is opened, and at least one of the first and second determination terminals is not opened.

The controller is provided with a data input terminal and first and second determination connection terminals respectively connected to the data output terminal and the first and second determination terminals of the pedal device. Whether or not the CCD sensor is connected is determined by the state of the first determination connection terminal, and if it is determined that the CCD sensor is connected, the presence or absence of abnormality of the CCD sensor is determined by the state of the second determination connection terminal. If it is determined that the CCD sensor is not connected according to the state of the first determination connection terminal, it is determined whether the encoder is connected or not connected according to the state of the second determination connection terminal. Equipped with means.

[0015]

When the pedal device and the controller according to the present invention configured as described above are used, both the pedal device using the CCD sensor as the pedal sensor and the pedal device using the encoder have the same connector, and a common connector for the controller. Since any of the pedal devices can be arbitrarily selected, the sewing machine can be configured.

Then, the determination means of the controller detects the state transition of the first and second connection terminals for determination of the connector, and based on the combination, whether or not the pedal device is connected and the sensor of the connected pedal device is detected. Type and CCD
Since it determines whether or not there is a sensor abnormality, it is not necessary to perform any switching operation even if the pedal device changes, and it is possible to properly handle connector disconnection, contact failure, or sensor abnormality, and to cause runaway or cause of the sewing machine. It is possible to prevent an unknown inactivity.

When a pedal device having a CCD sensor is connected to the connector of the controller, the first judgment connection terminal is brought into a state in which it can be discriminated (for example, ground or open), and the second judgment is made. The clock pulse for data latch of the CCD sensor is input to the connection terminal. However, when the CCD sensor is abnormal, the clock pulse is not input to the second determination connection terminal and remains at the high level or the low level, so that the determination means can determine it.

When the connector of the pedal device using the encoder is connected, the first determination connection terminal is in a state different from the state in which the connection of the CCD sensor can be identified, and the second determination is made. Since a certain level of voltage (including ground) is input to or opened to the connection terminal for use and neither the first nor the second connection terminal for opening is opened, the determination means of the controller is an encoder. Can be determined to be connected.

If none of the pedal devices is connected or if there is poor contact (a state in which the respective terminals are not electrically connected even if the connector is apparently connected), the first and second determinations are made. Since all the connection terminals for use are open, it can be determined. In this way, the determination means of the controller detects and determines the combination of the state transitions of the first and second determination connection terminals.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 3 is a perspective view showing an example of an external appearance of an electric sewing machine using the pedal device and the controller according to the present invention.

In this electric sewing machine 1, a sewing machine main body 3 is mounted on an operation console 2, and a sewing machine motor 4 and a controller 5 which is a sewing machine controller are arranged below the operation console 2. The sewing machine motor 4 and the sewing machine main body 3 are the pulley 6 and the sewing machine main body 3 provided on the rotary shaft of the sewing machine motor 4.
Is connected to a synchronizer 7 provided on the main shaft by a belt 8 stretched around the synchronizer 7.

Further, a sewing machine pedal 10 is provided below the operation console 2 so as to be capable of stepping on and off by a worker's foot, and a sensor section 1 for sensing the amount of stepping.
1 and a link rod 12 are connected. The sewing machine pedal 10, the sensor unit 11 and the link rod 12 constitute a pedal device. The sensor unit 11 is connected to the controller 5 by a connector (not shown).

The controller 5 receives data on the amount of depression of the sewing machine pedal 10 from the sensor unit 11, a motor encoder (motor speed detector), a sewing machine needle position detector (inside the synchronizer 7), etc., which are not shown. The rotation speed of the sewing machine motor 4 is controlled based on the detection signal of.

FIG. 4 is a block diagram showing only a portion of the control system of the electric sewing machine 1 relating to the present invention. The controller 5 mainly includes a sewing machine control unit 15 and a motor control unit 16
And an arithmetic processing unit (CPU), a read only memory (ROM), and a random access memory (R).
AM), an input / output device (I / O), and the like.

Then, the sewing machine control section 15 inputs the stepping amount data of the sewing machine pedal 10, the CCD / encoder identification signal and the CCD clock (in the case of a CCD sensor) from the sensor section 11 of the pedal device through a connector described later, Whether or not the pedal device is connected and the type of the sensor when connected and the presence or absence of an abnormality are determined, and the rotation speed of the sewing machine motor 4 is determined according to the depression amount data.
The motor control unit 16 is instructed to rotate / stop and the rotation speed of the sewing machine motor 4.

As a result, the motor control unit 16 controls the rotation and stop of the sewing machine motor 4 that rotationally drives the sewing machine spindle via the motor driver 17. At this time, the motor encoder 18 detects the speed and phase of the sewing machine motor 4 and feeds them back to the motor control unit 16 to perform accurate motor control.

The sewing machine needle position detector 18 detects a needle upper point or a needle lower point among the needle positions, and inputs the detection signal to the sewing machine controller 15. The sewing machine controller 15 counts the number of cycle needles, drives the thread cutting solenoid 21 via the thread cutting solenoid driver 20, and uses it as a drive trigger for various actuators.

5A and 5B are mechanical views showing an example of the sensor section 11 of a pedal device incorporating a CCD sensor as a pedal sensor. FIG. 5A is a front view and FIG. 5B is a side view of the main part. A frame 30 is provided in the sensor unit 11, a rod 31 penetrating vertically in the frame 30 is slidably held, and a front stepping spring 32 and a rear stepping spring 33 return to a neutral state. Giving habits. This rod is connected to the sewing machine pedal 10 via the link rod 12 shown in FIG.

A light-shielding plate 34 is fixedly mounted on the rod 31, and one end of the light-shielding plate 34 is fitted into a rotation stop groove 30a formed in the frame 30 to prevent the rod 31 from rotating. On the other hand, a light source 35 such as an LED and a CCD sensor 36 face each other across the light shielding plate 34 and are fixed to the frame 30.

When the sewing machine pedal 10 is depressed, the rod 31 descends and the light shielding plate 34 and the light source 35 and CC
Move between the D sensors 36 in the opening direction to move the sewing machine pedal 1
When 0 is stepped backward, the rod 31 moves up and the light shield plate 3
4 moves in the closing direction between the light source 35 and the CCD sensor 36.

FIG. 1 is a circuit block diagram showing a part of a controller 5 and a sensor portion 11 of a pedal device using this CCD sensor. The sensor unit 11 includes an oscillator 37,
And a frequency dividing counter 38 for dividing the clock pulse generated therein to generate a clock pulse for data latch of the CCD sensor 36, and a CCD drive circuit 39 for operating the CCD sensor 36 by using the divided clock pulse. There is.

Further, the comparator 40 for binarizing the signal Vout read from the CCD sensor 36 in synchronization with the clock pulse, the counter 41 for counting the binarized signal, and the count data of the counter 41 are latched. The latch circuit 42 is also provided. The counter 41 is started by a pulse from the CCD driving circuit 39, outputs the count data by the data latch clock pulse from the frequency dividing counter 38, and causes the latch circuit 42 to latch it.

The CCD sensor 36 detects a bright portion and a dark portion and outputs Vout. This Vout is binarized by the comparator 40, and the position of the light shielding plate 34 on the CCD sensor 36 can be detected as the count value of the counter 41. The position of the light shielding plate 34 is set to the sewing machine pedal 1
It is replaced with a stepping amount of 0 and output as stepping amount data. Here, the value latched by the latch circuit 42 is the depression amount data, and the data latch clock pulse from the frequency division counter 38 is also latched and output as the CCD clock.

Reference numeral 43 denotes a connector for connecting to the controller 5, and the CCD sensor 36 from the latch circuit 42.
Data output terminal 43a of a predetermined bit (8 bits in this example) that outputs the depression amount data based on the detection signal of
And a first determination terminal (CCD / encoder identification terminal) 43b connected to the ground and a second determination terminal (CCD clock terminal) 43c for outputting a data latch clock pulse of the CCD sensor. There is. The connector 43 is also provided with a power supply terminal, a control signal terminal, and the like, but they are not shown, and the light source 35, the light shielding plate 34, and the like shown in FIG. 5 are also omitted.

On the other hand, the controller 5 side is also provided with a connector 44 which is fitted to the connector 4 and to which each terminal is connected. The connector 44 of the pedal device is attached to this connector 44.
Data output terminal 43a and first and second determination terminals 4
Data input terminals 44 connected to 3b and 43c, respectively
a and the first and second determination connection terminals 44b and 44c are provided. Although the connector 44 is also provided with a power supply terminal, a control signal terminal and the like, they are not shown.

The first and second determination connection terminals 44b and 44c of the connector 44 have pull-up resistors 45 and 46, respectively.
Connected to a 5V DC power source via a high level “H”
When the connector 43 of the sensor unit 11 is not connected to the connector 44, the low level “L” signal is used as the signal b and the signal c in the sewing machine. The input is made to the control unit 15.

FIG. 2 is a circuit block diagram of a sensor portion of a pedal device using a known incremental encoder as a pedal sensor. The sensor unit 11 'includes an incremental encoder 50 and an origin detector 51 for the origin.
And a counter 52 that counts encoder pulses generated by the incremental encoder 50 according to the amount of depression of the sewing machine pedal 10 shown in FIG. 3, and a latch circuit 53 that latches the count value and outputs it as depression amount data. ing.

Further, a connector 54 for connecting to the controller 5 of the sewing machine is provided, and the connector 54 has the same shape and terminal arrangement as the connector 43 of FIG. 1, and the depression amount data based on the detection signal of the incremental encoder 50. A predetermined bit (8 bits in this example) data output terminal for outputting
It was opened at the same position as (No Connect: N.
C) The first determination terminal 54b and the second determination terminal 54c, which is located at the same position as the second determination terminal 43c and is connected to the ground, are provided. Although the connector 54 is also provided with a power supply terminal and a control signal terminal, they are not shown.

The connector portion 11 or 11 'of such a pedal device can be connected by connecting the connector 43 or 53 and the connector 44 on the controller 5 side, but the sewing machine control portion 15 in the controller 5 is First,
The state transition of the second determination connection terminals 44b and 44c is detected, and the presence or absence of connection of the pedal device, the type of sensor of the connected pedal device, and the presence or absence of abnormality of the CCD sensor are determined from the combination thereof.

FIG. 6 is a flow chart of a subroutine of pedal judgment processing by the sewing machine control section (microcomputer) at that time, and FIG. 7 shows judgment results for the combination of the signals b and c shown in FIG. 1 at that time. It is a figure which shows a relationship.

When the processing of FIG. 6 is started, first, the signal b
It is determined whether or not (inversion signal of CCD / encoder identification signal) is "H", and if YES, it is determined that the pedal device using the CCD sensor is connected. Then, it is judged whether or not the CCD clock is input to the signal c, and if YES, it means that the CCD sensor is normal and NO.
If it is (fixed to "H" or "L"), it is determined that the CCD sensor is abnormal, and the process returns to the main routine (not shown).

If the signal b is "H" and it is NO, it is further judged whether or not the signal c is "H". If YES, a pedal device using an incremental encoder is connected. If NO, it is determined that the pedal device is not connected (including disconnection of the connector or poor contact of the terminal), and the process returns to the main routine. Therefore, in the main routine, it is possible to perform control processing, display, warning, etc. according to the respective judgment results.

When it is determined that any one of the pedal devices is connected and the sensor is normal, the depression amount data from the data input terminal 4a is input in the main routine, and the sewing machine motor 4 corresponding to the data is input. The motor control unit 16 is caused to control the rotation speed of.

Although the incremental encoder is used for the sensor portion 11 'of the pedal device using the encoder as the pedal sensor in the above-mentioned embodiment, an ordinary encoder or an absolute encoder may be used.

Further, a sensor section 11 provided with a CCD sensor
The first determination terminal of the connector 43 of No. 4 is connected to the ground of 43b, and the connector 5 of the sensor unit 11 'provided with the encoder is connected.
The first determination terminal 43b of No. 4 is opened, but this may be reversed, in which case the signal b in FIG. 7 is "L" when the CCD is used and when the pedal is not used.
And becomes "H" when the encoder is used. In this case, the second judgment terminal 54c of the connector 54 may be opened (the signal c becomes "L").

However, it is possible to determine whether or not the pedal device is connected by preventing the first and second determination terminals from being opened in either connector. Further, when these determination terminals are connected to the ground, a zero level voltage is output, but instead of this, a positive or negative constant voltage level may be output. In that case, the pull-up resistor and the inverter on the controller 5 side can be omitted.

[0047]

As described above, when the pedal device and controller of the sewing machine and the sewing machine according to the present invention are used, a pedal device using a CCD sensor as a pedal sensor and a pedal device using an incremental encoder are optional. It is possible to configure the electric sewing machine system by connecting to a common controller.

At this time, not only the type of sensor of the connected pedal device can be automatically judged by the controller side but also disconnection of the connector, contact failure of the terminal and sensor abnormality can be judged, so that switching by a dip switch or the like is not required. Both can control the speed of the sewing machine motor according to the type of sensor of the pedal system, and can also perform appropriate processing when the connector is disconnected or the sensor is abnormal, causing the sewing machine to run out of control or become inoperable for unknown reasons. You can prevent this.

Further, since a common connector can be used for the sensor section of any type of pedal device, there is a cost advantage, and the pedal device can be arbitrarily changed.
It is also possible to increase the expandability of the system.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing a sensor unit 11 and a part of a controller 5 of a pedal device which is an embodiment of the present invention using a CCD sensor as a pedal sensor.

FIG. 2 is a circuit block diagram of a sensor portion of a pedal device that is an embodiment of the present invention using a known incremental encoder as a pedal sensor.

FIG. 3 is a perspective view showing an example of an external appearance of an electric sewing machine using a pedal device and a controller according to the present invention.

FIG. 4 is a block diagram showing only a portion of the control system of the electric sewing machine shown in FIG. 3 related to the present invention.

FIG. 5 is a mechanism diagram showing an example of a sensor unit 11 of a pedal device incorporating a CCD sensor as a pedal sensor.

FIG. 6 is a flowchart of a subroutine of pedal determination processing by the sewing machine controller (microcomputer) shown in FIGS. 1 and 4.

7 is a diagram showing a relationship of determination results with respect to a combination of the signals b and c shown in FIG. 1 in the processing of FIG.

[Explanation of symbols]

1 electric sewing machine 2 operation console 3 sewing machine main body 4 sewing machine motor 5 controller 7 synchronizer 8 belt 10 sewing machine pedal 11, 11 'sensor section 12 link rod 15 sewing machine control section 16 motor control section 18 motor encoder 19 sewing machine needle position detector 30 frame 31 Rod 32 Front step spring 33 Rear step spring 34 Light shield plate 35 Light source 36 CCD sensor 37 Oscillator 38 Frequency divider 39 CCD drive circuit 40 Comparator 41, 52 Counter 42, 53 Latch circuit 43, 54 Pedal device side connector 43a, 53a Data Output terminal 43b, 53b First determination terminal 43c, 53c Second determination terminal 44 Controller side connector 44a Data input terminal 44b First determination connection terminal 44c Second determination connection terminal 45, 4 6 Pull-up resistance 47, 48 Inverter 50 Incremental encoder 51 Origin detector

Claims (4)

[Claims] 1. A pedal device for a sewing machine, comprising: a CCD sensor for detecting a stepping amount of a sewing machine pedal to generate a detection signal; and a connector for connecting to a controller of the sewing machine. A first bit in a state in which the connection between the CCD sensor and a data output terminal of a predetermined bit for outputting the depression amount data based on a detection signal can be identified.
And a second determination terminal for outputting a data latching clock pulse of the CCD sensor, the sewing machine pedal device. 2. A pedal device for a sewing machine, comprising: an encoder for detecting a stepping amount of a sewing machine pedal to generate a detection signal; and a connector for connecting to a controller of the sewing machine, wherein the connector has a detection signal from the encoder. A data output terminal of a predetermined bit for outputting the depression amount data based on the above, a first determination terminal in a state different from the state in which the connection of the CCD sensor can be identified, and a constant voltage level is output or opened. And a second determination terminal, wherein at least one of the first and second determination terminals is not opened. 3. A connector which can be connected to any connector of the pedal device of the sewing machine according to claim 1 or 2, and means for controlling the rotation speed of the sewing machine motor in accordance with stepping amount data input through the connector. And a data input terminal and a first and second data input terminal connected to the data output terminal and the first and second determination terminals of the connector of the pedal device, respectively. A connection terminal for determination is provided, and state transitions of the first and second connection terminals for determination are detected,
A controller of a sewing machine, which is provided with a judging means for judging whether or not the pedal device is connected, the type of sensor of the connected pedal device, and the presence or absence of abnormality of the CCD sensor based on the combination. 4. A pedal device in which at least one of a CCD sensor or an encoder for detecting a stepping amount of a sewing machine pedal and generating a detection signal can be arranged, and a stepping amount data based on the detection signal from the pedal device. In the sewing machine in which the rotation speed of the sewing machine motor is electrically connected to the controller by a connector, a connector of the pedal device is provided with a predetermined bit for outputting stepping amount data based on a detection signal of the CCD sensor or the encoder. In the case where the data output terminal, the first determination terminal in a state in which the state in which the CCD sensor is connected and the state in which the encoder is connected or the state in which nothing is connected are distinguishable, and the CCD sensor are arranged, When the clock pulse for the data latch is output and the encoder is arranged, A second terminal for determination that outputs a constant voltage level or is open, and at least one of the first and second terminals for determination is not open; A data input terminal connected to the data output terminal and the first and second determination terminals;
A second determination connection terminal is provided, and it is determined whether or not the CCD sensor is connected according to the state of the first determination connection terminal. If it is determined that the CCD sensor is connected, the second determination connection terminal is connected. The presence or absence of abnormality of the CCD sensor is determined by the state of the determination connection terminal, and when it is determined that the CCD sensor is not connected by the state of the first determination connection terminal, the second determination connection terminal A sewing machine having a determination means for determining whether the encoder is connected or not connected according to the state of.