JPH0430889A - Controlling method for changeover to embroidery stitching in sewing machine - Google Patents

Abstract

PURPOSE:To move a carriage at a high speed in an oscillation-less and noise-less state by performing arithmetic on required rise data, fall data, and high speed movement step number, from stored coordinates and initial setting coordinates, or stitching data coordinates, and by saving stop-control on the way to drive a device. CONSTITUTION:When a normal stitching mode is switched to an embroidery stitching mode, then through a distance between coordinates stored in an initially set coordinate storage means 19 and the initial position coordinates of the embroidery stitching mode, arithmetic is performed on a moving step number, and against an arithmetic operation result, a step number except the using number of rise and fall stored in a driving curve storage means 17 is set as a high speed moving step number. The movement is performed continuously without stopping a motor shaft and is stopped at the initial setting position of the embroidery stitching. After that, the required patterns of the embroidery stitching are selected, and a needle rod amplitude stepping motor 9 and an operation-regulating stepping motor 10 which are switched respectively for the X-directional driving and Y-directional driving of an embroidery frame are regulated according to the vertical movement of the needle, and are driven based on the stitching data of a stitching data storage means 20, and the embroidery stitching patterns are formed.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for controlling a stepping motor of a sewing machine that can be used by switching between a normal pattern sewing mode and an embroidery sewing mode. Problems to be solved) Regular stitching in which a pattern is formed by controlling the feed back and forth in synchronization with the left-right movement of a needle that moves up and down and the up-and-down movement of an edging needle, and embroidery in which the fabric is held against a needle that moves up and down. A sewing machine has been proposed that enables switching between embroidery stitching and embroidery stitching in which a pattern is formed by driving a frame back and forth and left and right.

In such a sewing machine, when the power is turned on, the sewing machine is set to be controlled so as to correspond to a predetermined specific pattern of normal stitching.

During normal sewing, the carriage that holds the embroidery frame is set to a retracted position that does not interfere with sewing.

Although this retracted position is generally set at a predetermined mechanical position, the position of the carriage when the power is turned on may not necessarily be set to the retracted position. Therefore, when the power is turned on, a setting operation to the retracted position is performed.

In this setting operation, the stepping motor is driven every step (l pulse) until the detection sensor can detect the retracted position.

Next, when the embroidery mode is selected after the power is turned on, the carriage is moved from the retracted position to the initial position for embroidery stitching. Even in this operation, take one step (
1 pulse) to drive the stepping motor.

To control the drive of the embroidery frame from the initial position of the embroidery stitch, the stepping motor is driven based on the control signal stored in the storage means to form the embroidery stitch.

Generally, when driving a stepping motor one step at a time (l pulse), as shown in Fig. 5, a stop control is included in order to read the detection result of the sensor every l operation, and the detection value of the detection sensor is The speed of the motor cannot be increased to read and stop the motor, and the motor shaft of the stepping motor vibrates due to the stop control, causing vibration and noise from the drive system.

For this reason, it has been proposed to increase the speed by loading and stopping detected values not every step but every few steps. However, even with this, vibrations and noise as described above occur.

It is an object of the present invention to provide a control method that allows setting to be performed at high speed without vibration and noise from the stepping motor during these controls.

(Means for Solving the Problem) Therefore, in the present invention, there is a normal sewing mode in which a pattern is formed by controlling the feed back and forth in synchronization with the horizontal movement of the vertically moving needle and the vertical movement of the corrosive needle, and the vertical sewing mode. For sewing machines that can switch between the embroidery mode in which a pattern is formed by moving the embroidery frame that holds the fabric against a moving needle back and forth, left and right, the machine is set to a specific pattern in the predetermined normal stitch mode when the power is turned on. a step of returning the carriage holding the embroidery frame during the normal sewing mode using a sensor that detects the retracted position coordinates; a step of storing the retracted position coordinates as the initial set position of the stepping motor; a step of calculating the number of driving steps of the stepping motor using the moving distance from the initial set position for carriage movement, and subtracting the number of steps required for a rising curve and the number of steps required for a falling curve from the step number; The method also includes a step for setting the number of steps for driving the stepping motor without stop control, and moving the carriage from the retracted position when switching from normal sewing mode to embroidery mode and switching from embroidery mode to normal sewing mode. Drives high-speed movement to the retracted position when switching.

(Example) Next, an example of the present invention will be described in detail with reference to the drawings.

FIG. 3 is an external view of a sewing machine equipped with the drive control method of the present invention.

This sewing machine has a normal sewing mechanism that forms a pattern by controlling the feed back and forth in synchronization with the left-right movement of the needle that moves up and down and the up-and-down movement of the corrosive needle, and a mechanism that holds the fabric against the needle that moves up and down. It incorporates an embroidery sewing mechanism that drives the embroidery frame back and forth, left and right to form a pattern, and a switching mechanism. For details of this mechanism, please refer to the Japanese Patent Application No. 1-1 proposed earlier by the applicant.
Since it has already been explained in 87269 and others, the explanation will be omitted.

In FIG. 3, a pattern selection means 4 is mounted on the sewing machine frame l. The pattern selection means has a transparent touch panel disposed on a liquid crystal display panel that displays each pattern group, and is formed so that many patterns can be selected. The details of the selection means are the same as those in Japanese Patent Application No. 181485/1983, so the explanation will be omitted.

This selected pattern is displayed on the pattern display means 5.

Reference numeral 6 denotes a sewing mode selection means, which can be operated to select between a normal sewing mode in which a pattern is formed by controlling the left and right movement of the needle and the forward and backward movement of the feed, and a normal sewing mode in which the embroidery frame holding the fabric against the needle is driven back and forth and left and right. to switch between the embroidery sewing mode and the sewing mode that forms the pattern.

A drive shaft (none of which is shown) that is connected to a sewing machine motor as a drive source and whose rotation is transmitted is rotatably supported in the sewing machine frame l, and the needle bar 2 connected to the drive shaft is It is supported on the sewing machine frame l so that it can move up and down. A needle 3 is fixed to the tip of the needle bar.

Reference numeral 7 denotes a carriage, which is equipped with screws for attachment, and an embroidery frame 8 for tensioning the cloth for embroidery stitching.
However, the installation is done by screws.

The sewing machine frame 1 is provided with a stepping motor 9 for needle bar amplitude that moves the needle bar 2 left and right in the normal sewing mode by a switching means, and controls the carriage 7 in the X direction in the embroidery sewing mode; A stepping motor 10 for adjusting the feed is mounted in the frame of the sewing machine to control the forward and backward movement of the feed dog in the sewing mode and to drive and control the carriage 7 in the Y direction in the embroidery sewing mode.

Next, a control block diagram of the present invention will be explained with reference to FIG.

Reference numeral 11 denotes a central processing unit to which the pattern selection means 4, pattern selection means 5, and sewing mode selection means 6 are connected, and the needle bar amplitude stepping motor 9 and the feed adjustment stepping motor 1O are connected to a stepping motor. It is connected via a drive device 12.

The sewing machine motor 13 is connected to the central processing unit 11 via a speed control device 14 including a drive circuit.

Reference numeral 15 denotes a speed setting device, which is attached to the sewing machine frame 1 so as to be manually operable, and is connected to the speed control device 14.

Reference numeral 16 denotes a speed detection device, which detects the rotational speed of the sewing machine motor and enables feedback control.
It is connected to the.

Reference numeral 17 denotes a drive curve data storage means, which stores the number of steps and speed required for the rise (speed increase) curve B and the fall (fall) curve C with respect to the MAX speed of the stepping motor as shown by the solid line in FIG. It stores relational data and is connected to the central processing unit 11.

Further, when the stepping motor is driven at the highest speed, as shown in FIG. 6, the motor shaft is driven continuously without any stopping portions.

18 is an initial set position detection device, which detects the
A pair of photo ink printers 31 provided in the direction
is a detection means formed by a light emitting part a and a light receiving part mounted on the sewing machine frame 1, and a shielding plate 33 integrally mounted on the carriage 7, respectively, as shown in FIG. The position where the light receiving section is shielded by the shielding plate (the position indicated by the two-dot chain line in the figure) is used as the initial set position detection, and the detection result is connected to the central processing unit 11 so as to be able to output the detection result.

Reference numeral 19 denotes an initial set coordinate storage means, which stores the data of the detected and set initial set position.
Connected to 1.

Reference numeral 20 denotes a storage means for ordinary pattern sewing data and embroidery sewing data, in which control data for each pattern is stored, and is connected to the central processing unit 11.

Next, the operation of the drive control device configured as described above will be explained with reference to the flowchart of FIG. 2.

By turning on a power switch (not shown), in step (a), a predetermined specific pattern of normal stitching, for example, "straight stitching" is set.

In normal sewing, the carriage is required to be in a position corresponding to normal sewing, and in the present invention, the initial set position is required to be in the retracted position.

Therefore, in step (b), the initial set position detection means 18 drives the stepping motors 9 and 10, respectively, while detecting the retracted position for each operation of the stepping motor.

Therefore, driving and stopping are performed, and the driving speed is necessarily low. (a in FIG. 4) When the initial set position, which is the retracted position, is detected in step (C), the initial set position coordinates are stored in the storage means 19 in step (d). Incidentally, at the moment of emergency, the value at which the stepping motor was initialized is stored.

Next, in step (e) it is determined whether or not to switch to embroidery mode, and if you want to perform normal sewing without switching, select the normal sewing pattern in step (f), and in step (g) The sewing data of the selected pattern is read from the sewing data storage means 20, and the stepping motor 9 for needle bar amplitude and the stepping motor 10 for feed adjustment are driven in synchronization with the vertical movement of the needle to form a normal sewing pattern. .

Next, in step (h), it is determined whether or not the selected normal sewing pattern has been completed, and if it has been completed, it is determined in step (i) whether or not to switch the mode.

When switching the mode, and when switching from the normal sewing mode to the embroidery sewing mode in step (e) above, (in step D, the coordinates stored in the initial set coordinate storage means 19 and the initial setting of the embroidery sewing mode The number of movement steps is calculated from the distance between the position coordinates, and in step (k), the calculation result is stored in the drive curve storage means 17.
The number of steps excluding the number of rising and falling steps stored in is set as the number of high-speed movement steps, and these movements are performed continuously without stopping the motor shaft as shown in Figure 6. and stops at the initial setting position for embroidery stitching.

Next, in step <a), a desired pattern for embroidery stitching is selected.

In step (m), the needle bar amplitude stepping motor 9 and the feed adjustment stepping motor 10, which are switched to drive the embroidery frame in the X direction and in the Y direction, are timed to the vertical movement of the needle, It is driven based on the sewing data stored in the sewing data storage means 20 to form an embroidery sewing pattern.

Next, in step (n), it is determined whether or not the embroidery stitching has been completed, and when the embroidery stitching has been completed, it is determined in step (p) whether or not to switch to the normal sewing mode.

When switching, in step (q), the final coordinate position (generally the initial setting position for embroidery stitching) coordinates and storage means 1 are stored.
The number of moving steps is determined from the distance between the initial set coordinates stored in 9, and the number of high-speed moving steps is determined from the required number of rising and falling steps corresponding to the number of steps, and high-speed driving is performed.

(Effects of the Invention) As described above, according to the present invention, when the embroidery sewing carriage is retracted to the initial set position of the retracted position when the power is turned on, the drive is controlled while detecting the retracted position, and the initial set position is For example, by initializing the stepping motor and storing the coordinates, the stepping motor can be controlled from the initial setting position to the initial setting position for the embroidery sewing mode, or from the initial setting position to the retreat position for the normal sewing mode. Vibration and noise can be reduced by calculating the required starting and stopping data and the number of high-speed movement steps from the stored coordinates, initial setting coordinates, or sewing data coordinates, and driving without intermediate stop control. High-speed carriage movement is achieved without the need for

[Brief explanation of drawings]

The drawings relate to specific embodiments of the present invention; FIG. 1 is a control block diagram of the sewing machine of the present invention, FIG. 2 is a flowchart explaining the control method, FIG. 3 is an external view of the sewing machine, and FIG. 4 is a stepping motor. FIG. 5 is an explanatory diagram of the driving of a stepping motor that is controlled to stop every step. FIG. 6 is an explanatory diagram of the stepping motor during high-speed driving. FIG. 7 is an explanation of the initial cent position detection means. In the figure, 3 is a needle, 8 is an embroidery frame, 7 is a carriage, 18 is an initial set position detection device, and 9 and 10 are stepping motors. Patent applicant: Janome Sewing Machine Industry Co., Ltd.

Claims (2)

[Claims] (1) A normal sewing mode that forms a pattern by controlling the left-right movement of the needle that moves up and down, and controlling the feed back and forth in synchronization with the up-and-down movement of the needle, and an embroidery frame that holds the fabric against the needle that moves up and down. In a sewing machine that can switch between the embroidery sewing mode in which a pattern is formed by moving forward and backward, left and right, the steps include setting a specific pattern in a predetermined normal sewing mode when the power is turned on, and holding the embroidery frame in the normal sewing mode. a step of returning the carriage to its retracted position while detecting the retracted position coordinates by an initial set position detection device; a step of storing the retracted position coordinates as an initial set position of the stepping motor; A step of calculating the number of driving steps of the stepping motor using the moving distance from the set position, and controlling the number of steps excluding the required number of steps for the rising curve and the required number of steps for the falling curve from the step number. A method for controlling embroidery stitch switching in a sewing machine, comprising the step of setting the number of steps to drive a stepping motor without moving, and driving the carriage to move at high speed from an initial retracted position. (2) The embroidery stitch switching method for a sewing machine according to claim 1, wherein the retracted position is a machine origin coordinate.