JP2009226114A - Controller for sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a controller for a sewing machine which is capable of minutely performing the driving control of respective actuators in consideration of a deviation angle, and is versatile for a plurality of models of sewing machines. <P>SOLUTION: The controller for the sewing machine includes: a motor angle detecting unit for detecting the rotary angle of a rotary shaft in a sewing machine motor, based on a motor shaft reference angle signal and an encoder signal; a storage unit for storing marker coincidence stamping angle and a control angle as angle information in response to the plurality of models of sewing machines; an input unit for inputting the angle of the rotary shaft in the sewing machine motor, which is detected by the motor angle detecting unit, in the storage unit as a marker coincidence rotary shaft angle; a specifying unit for specifying and recognizing the model of the sewing machine among the plurality of models of sewing machines; and a driving control unit for obtaining the deviation angle (a deviation phase angle), based on the marker coincidence stamping angle and marker coincidence rotary shaft angle of the sewing machine specified in model, correcting the control angle in consideration of the deviation angle, and then, driving the sewing machine motor and the actuators. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control device for a direct drive type sewing machine that performs driving control of each associated actuator based on a rotation angle of a sewing machine main shaft.

  In recent years, in order to simplify and miniaturize the drive system by the sewing machine motor, the sewing machine motor is provided at the upper end portion of the pedestal, that is, the base end portion of the arm portion, and the sewing machine main shaft for moving the needle bar of the sewing machine up and down is the sewing motor In other words, so-called direct drive type sewing machines that are directly driven by the motor have been adopted.

  For example, a sewing machine described in Patent Document 1 includes a sewing machine main body including a pedestal portion standing on a bed portion of the sewing machine and an arm portion extending horizontally from the pedestal portion, and an upper end of the pedestal portion. A sewing machine motor is disposed in the section, the rotation shaft (output shaft) of the sewing machine motor and the sewing machine main shaft are coupled by a coupling or the like, and the sewing machine main shaft is directly driven by the sewing machine motor.

  In such a direct drive type sewing machine, the origin position of the sewing machine main spindle (for example, using the needle up position or needle down position) and the reference position (predetermined angle) of the sewing machine motor are detected, and the machine spindle from the origin position is detected. In addition to driving the sewing machine motor, for example, a back tack solenoid for performing lap stitching at the start and end of sewing, sewing, and the rotation angle of the sewing motor from the reference position It controls the drive of an actuator composed of a number of solenoids, such as a thread trimming solenoid for cutting the upper thread after the end of operation, a wiper solenoid for feeding the cut upper thread, and a dish floating solenoid for lifting the thread presser tray.

  Therefore, in a direct drive type sewing machine, it is desirable to connect the sewing machine motor and the main shaft so that the origin position of the sewing machine main shaft and the reference position of the sewing machine motor are accurately in phase. This is extremely difficult due to factors such as the accuracy of assembly.

JP-A-9-276580

  And, when performing angle detection of the main spindle of the direct drive type sewing machine and the rotation axis of the sewing machine motor, for example, as described in Patent Document 1, using an encoder disposed in the sewing machine motor, In order to control the drive of the sewing machine motor and each actuator installed in the sewing machine more closely, consider the deviation angle, which is the deviation angle between the origin position of the sewing machine spindle and the reference position of the sewing machine motor before sewing. It is necessary to perform the control.

  Conventionally, a control device for controlling the driving of each actuator as described above is prepared for each type of sewing machine (sewing machine head), and is mounted on the corresponding sewing machine to control the angle of each sewing machine. Therefore, there was room for improvement in terms of versatility between different sewing machine models.

  In view of these points, the present invention grasps a deviation angle, which is a deviation angle between the origin position of the sewing machine spindle and the reference position of the sewing machine motor, using an encoder disposed in the sewing machine motor, and considers the deviation angle. Thus, it is an object of the present invention to provide a sewing machine control device that can precisely control the drive of each actuator and can be used for a plurality of sewing machine models.

  In order to achieve the above-mentioned object, the control device of the sewing machine according to the first aspect of the present invention is characterized in that a rotary shaft connected with the same main axis as the main spindle of the sewing machine that moves the needle bar of the sewing machine up and down is provided. The rotation angle of the rotation shaft of the sewing machine motor is determined by a motor shaft reference angle signal that is output at a predetermined reference angle and a plurality of encoder signals that are output every rotation of the sewing machine motor. Motor angle detecting means for detecting, a marker formed on the outer periphery of a pulley connected to the sewing machine main shaft, and a marker formed on a sewing machine frame adjacent to the outer periphery of the pulley, corresponding to a plurality of sewing machine models Marker coincidence marking angle that is the angle of the main spindle of the sewing machine and the sewing machine main spindle that is used as a reference when driving the sewing machine motor and the actuator disposed on the sewing machine. Rotation shaft of the sewing machine motor is rotated from the reference angle of the motor shaft to an angle where both markers formed on the pulley and the machine frame coincide with each other. An input means for inputting the marker coincidence rotation axis angle detected by the motor angle detection means at the time to the storage means, a specifying means for recognizing the sewing machine model from the plurality of sewing machine models, and a model A deviation angle (deviation phase angle) is obtained based on the marker coincidence marking angle and the marker coincidence rotation axis angle of the sewing machine specified by the sewing machine, and the control angle is corrected in consideration of the deviation angle, and the sewing machine motor and Drive control means for driving the actuator.

  That is, in the direct drive type sewing machine scheduled to be mounted with the sewing machine control device of the present invention, one marker is formed on the outer periphery of the pulley connected to the sewing machine main shaft, and the sewing machine frame close to the outer periphery of the pulley. Is formed with the other marker that matches the marker formed on the pulley.

  Also, a marker coincidence marking angle that is an angle of the sewing machine main shaft when both of these markers coincide with each other, and a control angle that is a reference angle of the sewing machine main shaft when driving the sewing machine motor and the actuator disposed on the sewing machine. Is set for each of a plurality of sewing machine models on which the control device for the sewing machine is scheduled to be mounted, and is stored in the storage means.

  The motor shaft reference angle sensor disposed in the sewing machine motor having a rotation shaft connected with the same axis as the main shaft of the sewing machine that moves the needle bar of the sewing machine up and down is provided every time the rotation shaft is positioned at a predetermined angle. A reference angle signal is output, and an encoder disposed in the sewing machine motor is configured to output a plurality of encoder signals for each rotation of the sewing machine motor.

  Prior to the work, the operator determines the rotation angle of the rotation axis of the sewing machine motor detected by the motor angle detection means when both the markers formed on the pulley and the machine frame coincide with each other. Is stored in the recording means by the input means.

  In this state, the specifying means specifies the sewing machine model from among a plurality of sewing machine models stored in the control device, and the drive control means is configured to specify the sewing machine type specified by the sewing machine. Based on the marker coincidence marking angle and the marker coincidence rotation axis angle, a deviation angle that is a deviation angle between the origin position of the sewing machine spindle and the reference position of the sewing machine motor is obtained, and the control angle is determined in consideration of this deviation angle. Correction is performed, and the drive of the sewing machine motor and the actuator is controlled while the rotation angle of the rotation shaft of the sewing machine motor is detected by the motor angle detection means.

  As described above, the sewing machine control apparatus of the present invention is compatible with a plurality of sewing machine models, and uses the encoder disposed on the sewing machine motor of each type of sewing machine to use the origin position of the sewing machine spindle and the reference angle of the sewing machine motor. The deviation angle, which is a deviation angle from the position, is grasped, and the drive control of each actuator can be easily and carefully performed in consideration of the deviation angle.

  And, according to the control device for the sewing machine of the present invention, as described above, there is no need to arrange other position detectors or the like for general drive control, and for precise drive control. This contributes to cost reduction by minimizing the number of points, and when connecting the sewing machine motor to the spindle in a direct drive type sewing machine, the origin position of the sewing machine spindle and the reference angle of the sewing machine motor Since the accuracy with the position is not as strict as the conventional one, the assembly work is also simplified.

  As described above, according to the sewing machine control apparatus of the present invention, it can be used for a plurality of sewing machine models, and the origin position of the sewing machine spindle and the reference of the sewing machine motor can be obtained by using the encoder disposed in the sewing machine motor. By grasping the deviation angle, which is a deviation angle from the angular position, and considering the deviation angle, it is possible to precisely control the drive of each actuator. In addition, the cost is low and the assembly work is simplified.

  Hereinafter, an embodiment of a control device for a sewing machine according to the present invention will be described with reference to FIGS.

  As described above, the sewing machine according to the present invention is a so-called direct drive type sewing machine, and a leg pillar part standing on the bed part of the sewing machine on the bed part, and an arm extending in the horizontal direction from the leg pillar part. A sewing machine body is placed, and a sewing machine motor is disposed at the upper end of the pedestal column, and the rotary shaft (output shaft) of the sewing machine motor and the sewing machine main shaft are coupled by a coupling or the like. The sewing machine main shaft is configured to be directly driven.

  Then, one marker is formed on the outer periphery of the pulley connected to the sewing machine main shaft, and the other marker to be aligned with the marker formed on the pulley is formed on the sewing machine frame close to the outer periphery of the pulley. Yes.

  A controller as a control device is disposed under the bed portion, and the controller is configured to detect and input a depression amount of a sewing machine pedal disposed under the bed portion by a pedal sensor. Has been.

  In addition, presser lift solenoid, thread trimmer solenoid, wiper solenoid, back tack solenoid, etc. are provided in the machine body as actuators for driving the fabric presser lifter, thread trimmer cutter, wiper, back tack, etc. It is connected to a controller as control means via a drive circuit, and is configured to be driven and controlled at a predetermined timing.

  The control panel of the sewing machine main body is provided with a display device having a display such as a liquid crystal display device, and this display device is connected to a controller as a control means via a drive circuit and has a predetermined display. It is comprised so that it may perform. The control panel is provided with operation switches as input means capable of inputting the sewing machine model, spindle angle setting mode ON / OFF, spindle angle setting, and the like. In the present embodiment, a touch panel type liquid crystal panel is used as the display device of the display device, and the operation switch is a switch button displayed in a part of a display area of the liquid crystal panel, and the area of the switch button The input operation can be performed by touching. For example, when a sewing machine model is selected from a plurality of sewing machines, a plurality of the switch buttons are provided, and a desired switch button is selected and input.

  The sewing machine motor is connected to a controller as control means via a drive circuit, and is configured to control rotation. The sewing machine motor is provided with a motor shaft reference angle sensor, and outputs a motor shaft reference angle signal each time the rotation shaft of the sewing machine motor is positioned at a predetermined angle. A motor encoder is provided on the rotation shaft of the sewing machine motor, and the motor encoder outputs an encoder pulse as a rotation signal corresponding to the rotation angle of the sewing machine main shaft by the sewing machine motor. That is, one to a plurality of encoder signals are output for each rotation of the sewing machine motor.

  The controller then rotates the sewing motor, drives the solenoids, displays the display device, etc. based on data or detection signals from a pedal sensor, a motor shaft reference angle sensor, a motor encoder, an operation switch, etc. Is controlling.

  FIG. 1 is a block diagram showing the control system of the sewing machine together with the internal configuration of the controller.

  A controller as a control device that controls driving of each actuator of the sewing machine, a sewing machine motor, etc., connects external storage means such as a read only memory (ROM), a random access memory (RAM), and an EEPROM (EEPROM). The microcomputer comprises a CPU as a control means.

  In the present embodiment, the storage means (for example, EEPROM) is formed on a sewing machine frame close to the outer periphery of the pulley and a marker formed on the outer periphery of the pulley connected to the main spindle of the sewing machine for each of a plurality of sewing machine models. Marker coincidence marking angle, which is the angle of the main spindle of the sewing machine when matched with the marked marker, and control angle, which is the angle of the main spindle of the sewing machine used as a reference when driving the sewing machine motor and the actuator disposed on the sewing machine Are stored as angle information (based on the top dead center of the needle bar) and detected by the motor angle detection means when both the markers formed on the pulley and the sewing machine frame match. The marker coincident rotation axis angle, which is the rotation angle of the rotation axis of the sewing machine motor, is stored.

  In the present embodiment, the CPU as the control means each time the rotation axis of a sewing machine motor having a rotation axis connected with the same axis as the main spindle that moves the needle bar of the sewing machine up and down is positioned at a predetermined angle. A motor angle for detecting a rotation angle of the rotary shaft of the sewing machine motor based on a motor shaft reference angle signal output from the motor shaft reference angle sensor and a plurality of encoder signals output from the encoder for each rotation of the sewing machine motor. A detecting means, a specifying means for recognizing the sewing machine model from a plurality of sewing machine models, and a deviation angle based on the marker matching marking angle and the marker matching rotation axis angle of the sewing machine for which the model is specified As a drive control means for driving the sewing machine motor and the actuator by correcting the control angle in consideration of the deviation angle. To function.

  On the output side of the controller, a sewing machine motor drive circuit that drives the sewing machine motor to rotate by a drive control signal sent from a CPU as drive control means, and a display device that drives a display device arranged in front of the machine body A drive circuit, a drive circuit for driving each actuator, and the like are connected.

  On the other hand, the pedal sensor, motor shaft reference angle sensor, motor encoder, operation switch, and the like described above are connected to the input side. That is, the amount of depression of the sewing machine pedal from the pedal sensor is used to control the rotation / stop and rotation speed of the sewing machine motor that rotates the sewing machine main shaft from the controller via the sewing machine motor drive circuit. The motor encoder generates an encoder pulse every time the rotating shaft of the sewing motor rotates by a certain angle (for example, 1 °). The encoder pulse detects the rotational speed and the phase of the sewing motor, and detects the main shaft angle. Used for. The detection signal output from the motor shaft reference angle sensor is used to detect the origin of the angle of the rotation shaft of the motor as described above.

  Next, control of the control device in the sewing machine having such a configuration will be described based on the flowcharts of FIGS. 2 and 3 and the timing chart of FIG.

  First, after turning on the sewing machine, the operator touches the sewing machine (sewing machine head) on the sewing machine model selection screen displayed on the operation panel. A selection is input by operation (step ST1). In the following description, for the sake of convenience, it is assumed that a sewing machine having a sewing machine head of type A is selected.

  By this selection operation, the specifying means of the control device allows the selected sewing machine to be selected from the table such as the angle information corresponding to a plurality of sewing machine models as shown in FIG. The angle information corresponding to the model is read (step ST2).

  As the angle information, in this embodiment, the main axis rotation angle (upper needle stop angle) at the needle upper position where the marker coincidence marking angle (main axis marking angle) A is used, and the main axis at the needle lower position. The rotation angle (lower needle stop angle), the rotation angle of the main shaft that triggers the start of driving the thread trimming actuator (thread trimming ON angle), the rotation angle of the main shaft that triggers the end (thread trimming OFF angle), etc. are managed ing.

  Next, in the control device of the sewing machine, it is determined whether or not the operation switch in the spindle angle setting mode has been selected. That is, the operator sets the main shaft angle for calculating the deviation angle after turning on the power of the sewing machine (main shaft angle setting mode ON state), or operates the sewing machine while maintaining the current setting state. Whether to start (main shaft angle setting mode OFF state) is selected and input by selecting the operation switch (step ST3).

  When an operation switch that turns on the spindle angle setting mode is selected, an initial screen in the spindle angle setting mode as shown in FIG. 6 is displayed in the display area of the display device. In this initial screen, the shaft angle of the rotation shaft of the motor is displayed, but at this stage, it is in a no count state (step ST4).

  From this state, the operator manually turns the pulley connected to the main shaft in a predetermined direction (forward direction) (step ST5), and detects a signal of the motor shaft reference angular position generated by the motor shaft reference angle sensor (step ST6). ).

  When the ON edge of the motor shaft reference angle is detected (YES in step ST6), the encoder pulse signal count is started (step ST8) while notifying with a buzzer (step ST7). Displays the motor shaft angle obtained based on the encoder pulse signal (step ST9) At the stage where the ON edge of the motor shaft reference angle is detected, the encoder pulse signal count is "0" and the display screen As shown in FIG. 7, “0” is displayed as the motor shaft angle.

  As shown in FIG. 4, in the present embodiment, the encoder pulse is configured to output 360 pulses per rotation. Therefore, the motor shaft angle is incremented by 1 ° for each count of the encoder pulse.

  From that state, the operator manually turns the spindle pulley (step ST10), and is formed on one marker formed on the outer periphery of the pulley connected to the sewing machine main shaft and the sewing machine frame adjacent to the outer periphery of the pulley. The other marker is matched (step ST11).

  At this time, until one marker formed on the outer periphery of the pulley connected to the main spindle of the sewing machine matches the other marker formed on the sewing machine frame adjacent to the outer periphery of the pulley, the pulse signal of the encoder Repeating the count-up and displaying the motor shaft angle corresponding to the display screen for each count-up (NO in step ST11).

  When one marker formed on the outer periphery of the pulley connected to the sewing machine main shaft and the other marker formed on the sewing machine frame adjacent to the outer periphery of the pulley coincide with each other (YES in step ST11), the operator Touches the switch button for setting the spindle angle displayed in the display area (step ST12).

  In the present embodiment, as shown in FIG. 4, it is assumed that the switch button for setting the spindle angle is touch-operated when the motor shaft angle is 27 degrees.

Then, the motor shaft rotation angle B in the current state, that is, “27” is stored in the recording means (step ST13), and then the deviation angle C is calculated by the following formula (step ST14).

Deviation angle C = main shaft marking angle A−motor shaft rotation angle B

  That is, in the present embodiment in which the type A sewing machine head is selected, as shown in FIG. 4, it is formed on the outer periphery of the pulley connected to the shaft from the main shaft marking angle 50 ° in the read angle information. 23 ° obtained by subtracting 27 °, which is the motor shaft rotation angle when one marker and the other marker formed on the sewing machine frame close to the outer periphery of the pulley coincide, is calculated as the deviation angle C.

  Then, “23 °” as the deviation angle C is stored in the storage means and displayed on the display screen (step ST15), the spindle angle setting mode is completed, and the power is turned off. FIG. 8 shows an example of the display of the deviation angle C.

  Then, the power is turned on again to perform the sewing work, and through the steps of sewing head selection (step ST1) and angle information corresponding to the type of the sewing machine head (step ST2), The spindle angle setting mode OFF state in which the driving operation of the sewing machine is started is selected and input by the selection operation of the operation switch (step ST3).

  Thereafter, as shown in the flowchart of FIG. 3, every time the rotation shaft of the sewing machine motor is positioned at a predetermined angle, a motor shaft reference angle signal output from the angle sensor of the motor shaft reference angle is detected (step ST16). Then, initialization is performed to set the angle of the upper stop lower position and the lower stop position of the spindle at the deviation angle C, that is, 23 ° in the present embodiment, and management of the spindle angle is started from this state (step ST17). ), Upper needle stop control for stopping at a predetermined upper stop angle according to the head of the sewing machine is performed (step ST18).

  Subsequently, sewing machine operation control by pedal operation is performed (step ST19). If there is no rotation command (NO in step ST19), the sewing machine is stopped and waits for the rotation command. When there is a rotation command (YES in step ST19), the sewing machine is rotated while counting up and updating the spindle angle for each encoder pulse (step ST21), and angle control of the actuator such as thread trimming is performed (step ST22). ).

  FIG. 9 is a timing chart showing the timing of the spindle angle at which thread trimming control is performed as an example of actuator angle control.

  As shown in this figure, in the sewing machine having the machine head as type A, as shown in FIG. 5, the main shaft angle which is originally the ON timing of the thread trimmer actuator is 210 °, and the thread trimmer actuator is ON. Drive control is performed as timing. Similarly, 45 °, which is the OFF timing of the thread trimming actuator, is driven and controlled as the OFF timing of the thread trimming actuator.

  When the deviation angle C is a positive value, as described above, the angle is managed with the same value as the initial value. However, when the deviation angle C is a negative value, it is calculated at 360 ° -C. The value may be substituted as an initial value to perform angle management.

  According to the sewing machine control device of the present embodiment that performs angle management during drive control in this way, the drive control of each actuator can be performed closely, and a plurality of pre-stored sewing machine models Since the sewing machine model may be selected from the angle management data corresponding to (sewing machine head), the control device can be mounted on a plurality of sewing machine models.

  In addition, this invention is not limited to the said embodiment, It shall change variously as needed.

The block diagram which shows the relationship between the control apparatus of the sewing machine of embodiment of this invention, and the principal part structure of a sewing machine. Flow chart of angle control in control device for sewing machine according to embodiment of the present invention (No. 1) Flow chart of angle control in control device for sewing machine according to embodiment of the present invention (No. 2) Timing chart for explaining how to obtain a deviation angle of angle control in the control device for the sewing machine according to the embodiment of the present invention The table which shows an example of the angle information memorize | stored in the control apparatus of the sewing machine of embodiment of this invention Example of initial screen display in spindle angle setting mode of angle control in control device for sewing machine according to embodiment of present invention An example of a screen display at a stage where an ON edge of a motor shaft reference angle for angle control is detected in the control device for the sewing machine according to the embodiment of the present invention. An example of display of this deviation angle C obtained by angle control in the sewing machine control apparatus of the embodiment of the present invention Timing chart for explaining angle control in the control device for the sewing machine according to the embodiment of the present invention

Claims (1)

A motor shaft reference angle signal for outputting a rotation shaft of a sewing machine motor having a rotation shaft connected at the same axis as a main shaft for moving the needle bar of the sewing machine up and down at a predetermined reference angle, and for each rotation of the sewing machine motor. Motor angle detection means for detecting the rotation angle of the rotary shaft of the sewing machine motor by means of a plurality of encoder signals output to
The sewing machine main shaft when the marker formed on the outer periphery of the pulley coupled to the sewing machine main shaft and the marker formed on the sewing machine frame adjacent to the outer periphery of the pulley are matched with each other corresponding to a plurality of sewing machine models Storage means for storing, as angle information, a marker coincident marking angle that is an angle of the angle, and a control angle that is a reference angle of a sewing machine spindle that is used as a reference when driving the sewing machine motor and an actuator disposed on the sewing machine,
Marker coincidence rotation detected by the motor angle detection means when the rotation shaft of the sewing machine motor is rotated from a reference angle of the motor shaft to an angle at which both markers formed on the pulley and the sewing machine frame coincide. Input means for inputting a shaft angle to the storage means;
A specifying means for specifically identifying the sewing machine model from a plurality of sewing machine models;
A deviation angle is obtained based on the marker coincidence marking angle and marker coincidence rotation axis angle of the machine whose model is specified, and the control motor is corrected by taking the deviation angle into account to drive the sewing machine motor and the actuator. Drive control means for
Sewing machine control device.

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