JPH07669A - Control device for sewing machine - Google Patents

Abstract

PURPOSE:To confirm a needle location point without rotating a pulley by the hand by providing a control means for driving a motor so that a needle is moved from an upper stop position to the needle location point in a one for relatively moving the needle and a cloth in XY direction along a sewing pattern. CONSTITUTION:A control device for sewing machine controls the operation of a magnet/air driving part 40 such as a cloth presser, a pulse motor driving part 32 for moving the cloth presser in XY-direction and the motor driving part 38 of a head part driving motor M by a CPU 18 according to a prescribed program stored in a RAM 22. At the pushing operation of a needle location confirming key on an operation part 26, the motor M is drive-controlled on the basis of the output of a sensor for detecting the needle position, the needle is first lowered from an upper stop position to a needle location point near a throat plate surface, the needle location point is confirmed in this state, and the needle location confirming key is released when the needle locating point is OK, whereby the needle is raised. Thus, the operation for rotating a pulley by the hand to confirm the needle location point is not required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to control of a needle bar of an electronic cycle sewing machine, and in particular, when selecting an input function of a main body, the needle is lowered to a needle plate surface by an input from an operating section and a pulley is manually rotated. The present invention relates to a control device for a sewing machine that can perform coordinate confirmation without the need.

[0002]

2. Description of the Related Art FIG. 1 shows an overview of an electronic cycle sewing machine. In FIG. 1, reference numeral 2 is a motor, 3 is a cloth presser, and 4 is a needle. The motor 4 drives the needle 4 up and down, and the cloth presser 3 is moved and sewing is performed in accordance with previously instructed data.
Further, 6 is a pulley, 8 is an operating portion, and the operating portion 8 has a JOG key and an input key as shown in FIG.

Conventionally, in such a sewing machine, as shown in FIG. 3, when a part 12 is placed on a cloth 10 and is sewn along a sewing line 14, a needle drop is performed to instruct the sewing line 14 to the sewing machine. Coordinate input (spline input) must be performed on the point (P) 16 as shown in FIG.

At this time, a conventional coordinate input method will be described with reference to the flowchart of FIG. First, step 100
In step 3, the JOG key of the operation portion 8 is used to move the work clamp 3 left and right, up and down (coordinates X direction, Y direction) to roughly determine the position, and in step 102, manually rotate the pulley 6 behind the sewing machine head. , The needle 4 is lowered, and the needle drop point 16 is visually checked.

If the needle drop point 16 is good, step 1
At 04, the pulley 6 is manually rotated again to raise the needle, and at step 106, the needle drop point is set to be OK, and the input key is pressed at step 108 to confirm the coordinates.

If the needle drop point 16 is misaligned, the needle is raised by the pulley 6 in step 104, and then step 1
Since the needle drop point is NO at 06, the process returns to step 100 and the JOG key is used again to finely move the work clamp 3 to perform alignment.

In this way, when the input of one coordinate point is completed, the JOG key is used again to move to the next coordinate, and the same work is repeated by the number of coordinate points, and it is determined in step 110 that the input of all coordinates is completed. Then, the input work ends.

[0008]

However, in the conventional input method, as described above, the pulley 6 is manually rotated by the number of coordinate input points or more, and the needle is lowered or raised to raise the needle drop point 1.
You must check item 6. Moreover, at this time, one hand must be input to the pulley 6 and the other hand to the JOG key, input key, etc., with both hands closed, and the coordinate points such as spline input must be With many functions, there is a problem in that work efficiency is poor and operator fatigue is great. When the depth of the sewing machine is large, the pulley 6
Since they are far away from each other, the operator is forced to take an unreasonable posture, and the input work becomes more difficult.

In order to remedy this drawback, some hand pulleys are attached to the front side of the sewing machine head, but the hand pulley must still be turned above and below the needle, which results in work efficiency. Hasn't improved much.

The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide a sewing machine control device which facilitates the needle drop point confirmation work and improves the efficiency.

[0011]

SUMMARY OF THE INVENTION The present invention provides a motor for driving a sewing machine spindle in a sewing machine in which one of a needle and a cloth is relatively moved in XY along a sewing pattern to input coordinates.
A sensor that detects the rotation angle of the sewing machine spindle, and a confirmation switch, and a control means that drives the motor so that the needle moves from the upper stop position to the needle drop point near the needle plate surface while the sensor detects the sensor by operating the confirmation switch. By providing the above, the above-mentioned object is achieved.

In the present invention, the control means causes the needle to drop to the needle drop point near the needle plate surface when the confirmation switch is operated, and to rise to the upper stop position when the confirmation switch is not operated. is there.

The present invention is also one in which the confirmation switch is arranged in an operating portion equipped with a coordinate input switch.

[0014]

According to the present invention, since the means for lowering the needle to the needle drop point is provided without using the pulley, the needle drop point can be confirmed without turning the pulley by hand.

Further, in particular, when the means for lowering the needle to the needle drop point is a push button switch, and the needle is lowered while it is being pushed and raised when it is released, first,
By moving the work clamp and aligning the target coordinate point with the needle entry point, you can easily check the needle entry point by pressing the push button switch and lowering the needle to the needle entry point. .

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 6 is a block diagram showing the outline of the sewing machine controller of this embodiment.

In FIG. 6, reference numeral 18 is a CP for performing various controls.
U and 20 are ROMs, and 22 is a RAM, in which predetermined programs for controlling are stored.
Reference numeral 24 is an input unit for giving instructions from the outside through a floppy disk, and 26 is an operation unit for key input. As shown in FIG. 7, in addition to the JOG key, a needle drop confirmation key 17
have. A display unit 28 displays these input instructions. Further, 30 is a magnet for driving the cloth presser or the like, or an air drive unit, and 32 is a magnet for the cloth presser.
Motor drive unit for moving in the Y and Y directions, 3
Reference numeral 4 is a sensor input unit for detecting the position of the needle, and M is a head drive motor, which is driven through an interface (I / F) 36 and a motor drive unit 38.

As the head drive motor M, an inverter motor or an AC servomotor capable of rotating in the forward and reverse directions can be used.

The operation of this embodiment will be described below with reference to the flowchart of FIG.

In inputting coordinates when inputting the main body, first, in step 200, it is checked whether or not the needle is raised. This is because even if the needle is descending, if the JOG key is used to move the work clamp in the next step, the needle will break. If the needle is descending, error processing such as issuing a warning sound is performed in step 202, and the process returns to the original.

Next, at step 204, the XY movement of the work clamp is performed by the JOG key on the operation section as shown in FIG. After positioning, in step 206, when the needle drop confirmation key 17 on the operation unit as shown in FIG. 7 is pressed, the needle descends to the needle drop point. Check the needle drop point in this state,
When the needle drop point is OK in step 208, step 212
When the needle drop confirmation key 17 is released, the needle rises, and the coordinates are input by pressing the input key in step 214. When the needle drop point is NO in step 208, the needle drop confirmation key 17 is released in step 210 and the process returns to the beginning.
Align again with the JOG key.

Here, as for the lowering and raising of the needle, as shown in FIG.
By rotating the pulley 6 in the forward and reverse directions, and it is not necessary to turn the pulley 6 by hand.

Reference numeral 35 in FIG. 9 is a sensor (synchronizer) attached to the pulley 6, and the needle position is detected by the output of the sensor 35.

A typical output of the sensor 35 is shown in FIG. In FIG. 10, the normal stop positions above (UP) and below (DOWN) the needle are 40 ° to 70 ° and 1 respectively.
It is in the range of 25 ° to 165 °. Further, TG is a timing pulse indicating the sewing machine speed.

As shown in FIG. 11, the position of the needle at the time of inputting the main body includes A, the needle drop point and B, and the needle upward recoil,
FIG. 12 shows respective motor control timings.

In FIG. 10, for example, when one rotation of the pulley 6 is divided into 48, one pulse is 360 ° / 48 = 7.5.
11 and the needle drop point is 110 ° as shown in FIG. 11, (110 ° -70 °) ÷ 7.5 ° = 5
The point where 5 pulses advance from ° is the needle drop confirmation point. Apparently the needle drop point is the needle position where the tip of the needle is near the needle plate surface, and it is located near the cloth or slightly pierced.

In addition, as shown in FIG. 13, the head motor control can control the position by feeding back the output of the sensor 35 to the motor control section 40.

Returning to the flow chart of FIG. 8 again, when the input key is pressed to input coordinates in step 214, it is checked in step 216 whether or not all coordinates have been input. Similarly, use the JOG key and needle drop confirmation key 17 to check the coordinates,
Make an input.

The needle drop point can be dealt with by converting the angle inside the control by setting the material thickness and the like in advance with the operation keys. To prevent this, the needle can always be lowered to a certain height, and the operator can concentrate his nerve only at the coordinate position.

Conventionally, when the needle is lowered by the pulley, the cloth presser may be mistakenly moved by the JOG key, and the needle may be hooked and broken, but according to this embodiment, the needle drop confirmation key 1
Since the function of the JOG key can be prohibited while pressing 7 continuously (while the needle is descending), there is no such concern.

Instead of newly providing the needle drop point confirmation key 17, the needle drop confirmation key 17 is attached to the start pedal switch.
May have the function of.

[0033]

As described above, according to the present invention, the control for driving the motor so that the needle moves from the upper stop position to the needle drop point near the needle plate surface while being detected by the sensor by operating the confirmation switch. Since the means is provided, the needle can be lowered and raised without turning the mechanical pulley 6 by hand,
It has an excellent effect that it can be easily operated with one hand and the efficiency of input work is greatly improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a sewing machine having electronic control means.

FIG. 2 is a front view of a JOG key and an input key of a conventional operation unit.

FIG. 3 is a perspective view showing a state of inputting coordinates.

FIG. 4 is a diagram showing an example of coordinate points.

FIG. 5 is a flowchart showing a conventional coordinate input method.

FIG. 6 is a block diagram showing an outline of a sewing machine controller of the present embodiment.

FIG. 7 is a front view showing a JOG key and a needle drop confirmation key in this embodiment.

FIG. 8 is a flowchart showing a coordinate input method of this embodiment.

FIG. 9 is a side view of a sewing machine showing a mechanism for moving a needle up and down without manually rotating a pulley.

FIG. 10 is a diagram showing a sensor output at a needle position.

FIG. 11 is a table showing needle positions when the main body is input.

FIG. 12 is a diagram showing the motor control timing of the needle position when the main body is input.

FIG. 13 is a block diagram showing head motor control.

[Explanation of symbols]

 6 ... Pulley 16 ... Needle drop point 17 ... Needle drop confirmation key 26 ... Operating section 35 ... Sensor (synchronizer)

Claims (3)

[Claims] 1. A needle or a cloth is X-shaped along a sewing pattern.
In a sewing machine that moves coordinates relative to Y and inputs coordinates, a motor that drives the sewing machine spindle, a sensor that detects the rotation angle of the sewing machine spindle, a confirmation switch, and the needle from the upper stop position while the sensor detects it by operating the confirmation switch. A control device for a sewing machine, comprising: a control unit that drives a motor so as to move to a needle drop point near the needle plate surface. 2. The control means according to claim 1, wherein the needle descends to a needle drop point near the needle plate surface when the confirmation switch is operated, and the needle rises to an upper stop position when the confirmation switch is not operated. And the control device of the sewing machine. 3. The control device for a sewing machine according to claim 1, wherein the confirmation switch is arranged in an operation section equipped with a coordinate input switch.