JPH0679633B2 - Embroidery sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine, and more particularly to an embroidery sewing machine that can sew sewing elements such as various characters and patterns.

(Prior Art) Conventionally, when sewing is performed in this type of sewing machine, it is necessary to first confirm the sewing area so that a sewing pattern or the like is sewn within a predetermined area on the work cloth held by the embroidery frame. . For example, when setting a rectangular sewing area, after determining the origin (upper left of the normal sewing area), the sewing area is set by numerically inputting the distances from the origin in the X-axis and Y-axis directions.

(Problems to be solved by the invention) However, in the conventional setting of the sewing area, all that is required is to input the above-mentioned numerical values, and therefore an unintended sewing area is set due to the way of setting the origin or improper input numerical values. However, there is no means for confirming it, and when a small embroidery frame is used, it may be set beyond the embroidery frame. In such a case, if the sewing is executed as it is, there is a problem that a needle and an embroidery frame collide with each other.

(Object of the Invention) An object of the present invention is to solve the above-mentioned problems of the prior art. After the sewing area is set, the embroidery frame is visually traced by tracing the outer shape of the setting area. (EN) Provided is an embroidery sewing machine capable of confirming a sewing area set by a person, thereby finding an inappropriate setting of the sewing area at an early stage and enabling reliable sewing work.

(Means for Solving the Problems) The present invention includes a stitch forming means that includes a needle that moves up and down, and that forms a stitch on a work cloth; a work cloth holding means that holds the work cloth;
In a sewing machine including a feeding device that changes a relative position between the needle and the work cloth holding means, sewing area setting means for setting a sewing area on the work cloth held by the work cloth holding means, and The driving means includes a computing means for computing drive data for driving the feeding device along the outer periphery of the setting area set by the sewing area setting means, a driving means for confirming and driving the feeding device based on the driving data, and the driving means. The gist of the invention is to include a start means for applying a start signal for the confirmation drive to the drive means.

(Operation) First, when the sewing area is set on the work cloth held in the work cloth holding means by the sewing area setting means, the calculating means is set on the outer periphery of the setting area set by the sewing area setting means. Drive data for driving the feeding device is calculated along the line. When the start signal is input by the start means, the drive means confirms and drives the feeding device based on the drive data.

(Embodiment) An embodiment in which the present invention is embodied in an embroidery sewing machine will be described below with reference to FIGS. 1 to 7.

A sewing machine arm 3 is provided on the work cloth supporting surface 2 of the sewing machine table 1. A sewing machine motor 4 for rotationally driving a sewing machine main shaft (not shown) is mounted on the right side of the sewing machine arm 3. The sewing machine arm 3
A needle bar 6 having a needle 5 at its lower end and vertically moved with the rotation of the sewing machine main shaft is attached to the left side of the machine. A sewing machine bed (not shown) facing the needle 5
Has a built-in hook (not shown) that cooperates with the needle 5 to form a stitch on the work cloth on the work cloth support surface 2.
The stitch forming means is configured by the cooperation of the shuttle and the needle 5.

A feeding device 8 is arranged below the needle 5 and on the work cloth supporting surface 2. The feed device 8 is provided with a pair of pulse motors (not shown) that are rotationally driven in synchronization with the vertical movement of the needle 5 in the front-back direction (Y direction) and the left-right direction (X direction).
A mounting arm 9 that moves in the direction) is provided, and an embroidery frame 10 as a work cloth holding means is mounted.

An electrical configuration will be described below. A central processing control device (hereinafter referred to as a CPU) 12 as a calculation means and a drive control means is provided in a control box 13 of an embroidery sewing machine, and includes a program memory 14 including a ROM and RAM. Working memory 15 is connected. In the program memory 14, a data editing program for creating sewing data by combining various embroidery patterns, a data registration program for storing the data in the floppy disk, and sewing based on the stored data A sewing program for performing the above, and an area setting program for setting the embroidery range are stored. The CPU 12 outputs a drive signal to the sewing machine motor 4 via the input / output interface 17 and the sewing machine motor drive circuit 26. Therefore, the sewing machine motor 4 rotationally drives the sewing machine main shaft to operate the stitch forming means.

Further, a detecting device 16 for detecting the needle upper position corresponding to the top dead center of the needle 5 and the needle lower position corresponding to the lower dead center is mounted in the sewing machine arm 3, and the detecting device 16 is installed. The detection signal output from is input to the CPU 12 via the input / output interface 17. Then, the CPU 12 receives the input / output interface 17 and the drive circuit based on the detection signal.
A drive signal is output to a pair of pulse motors (not shown) of the feeding device 8 via 25. As a result, the feeding device 8 is operated in a state where the needle 5 is pulled out upward from the work cloth W. Further, in the sewing area setting mode, the CPU 12 drives a pair of pulse motors (not shown) of the feeding device 8 through the input / output interface 17 and the drive circuit 25 based on a signal input based on the operation of the jog key 23. Output a signal. As a result, the feeding device 8 is operated in a state where the needle 5 is pulled out upward from the work cloth W.

On the upper surface of the control box 13, there is provided an input board 19 having a confirmation key 22, a jog key 23, an execution key, a data input key, an edit key, and an embroidery pattern selection key group 18 as start means. The display device 20 provided on the input board 19 is composed of a liquid crystal display device, and is driven by a display device drive circuit 21 which operates based on a display control signal output from the CPU 12 via the input / output interface 17. Further, a floppy disk drive device 24 is connected to the CPU 12 via an input / output interface 17, and a floppy disk (not shown) is detachably attached to the floppy disk drive device 24. This floppy disk stores sewing data corresponding to code data of various embroidery patterns including various kanji, hiragana, alphabetic characters, numbers and patterns.

The operation of the embroidery sewing machine configured as described above will be described.

When performing sewing, before selecting an embroidery pattern, the operator sets a sewing area in order to determine to what extent the work cloth W held in the embroidery frame 10 should be sewn.
First, the case of setting a rectangular area will be described.

The sewing area setting mode key of the input board 19 is operated to enter the sewing area setting mode (step 1, hereinafter step is represented by S), and then the jog key 23 is operated to operate the feeding device 8
Drive control (S2), and set the embroidery frame 10 attached to the mounting arm 9 so that the upper left position of the rectangular area A1 is directly below the needle 5 in S3 (movement of the embroidery frame 10 to the absolute origin position is completed. ).

Next, when the rectangular area setting key is turned on (S4), CP
U12 sets the rectangular area identification flag. Then, by inputting the coordinates (x, y) of the point P2 located at the lower right of the rectangular area A1 (that is, located at the diagonal position) with the ten keys 26, the CPU 12 causes the remaining vertices P1 and P3 of the rectangular area A1 to be displayed. The calculation is performed and the coordinate data P0 (0,0), P1 (x, 0), P2 (x,
y) and P3 (0, y) are stored in a predetermined storage area (S5).

When the confirmation key 22 is turned on after the sewing area is set, the confirmation mode is set (S6). Then, the CPU 12 determines that it is a rectangular area because the rectangular identification flag is set (S7), and the working memory 15
Coordinate data P0 (0,0), P1 (x, 0) of each vertex stored in
P2 (x, y) and P3 (0, y) are read from a predetermined storage area, and the moving direction and moving amount of the feeding device 8 (that is, the number of steps of the pulse motor) are calculated and obtained based on each coordinate data. (S8). After that, the CPU 12 drives the feeding device 8 to bring the origin P0 of the rectangular area A1 to the corresponding position under the needle (S9).

Subsequently, the CPU 12 moves the pulse motor for the X-axis direction by the moving amount x
Drive by the number of pulses to move only to move to point P1 (x, 0) (S10). Next, the pulse motor for the Y-axis direction is driven by the number of pulses to move by the moving amount y, and moves to the point P2 (x, y) (S11). Thereafter, similarly, the CPU 12 drives the pulse motor for the X-axis direction by the number of pulses to move by the moving amount −x, and moves to the point P3 (0, y) (S12). Next, the pulse motor for the Y-axis direction is driven by the number of pulses to move by the moving amount −y, and moves to the point P0 (0,0) (S13). In this way, the CPU 12 drives the feeding device 8 to move along the outer circumference of the rectangular area A1 to make the operator confirm. As a result of this confirmation, if the sewing area is the desired sewing area, the confirmation mode is ended by operating the execution key (S14). On the other hand, if the desired sewing area is not reached, the cancel key is operated by a key to return to S2.

Next, the case of setting a circular area will be described.

In S2, the operator operates the jog key 23 to move the feeding device 8
Is controlled to set the embroidery frame 10 mounted on the mounting arm 9 so that the center position of the circular area A2 is directly below the needle 5 (S3). Next, when the circular area setting key on the input board 19 is turned on (S4), the CPU 12 sets the circular area identification flag. Next, use the numeric keypad 26 to enter the circular area A2.
The radius R is input and stored in a predetermined storage area of the work memory 15 (S15).

After the sewing area is set, when the confirmation key 22 is turned on (S6), the CPU 12 shifts to S21 because the circular identification flag is set (S7).
In the calculation in S21, the outer circumference of the circular area A2 can be faithfully placed at the needle position, but since the calculation processing requires time, the circumference of the circular area A2 is often inscribed in the circumference. The processing is approximated to a polygon, and in this embodiment, it is a decagon. That is, first, the coordinates of the corner vertices of the decagon are calculated, and the coordinates of the vertices are stored in a predetermined storage area of the working memory 15 in the clockwise order (S2
1). When approximating an n-sided polygon (n is an integer of 3 or more), Θ = 2π / n as shown in FIG. 6, and the feeding device 8 sets the n-sided apex to be moved next from the origin P0 to C1. (0, R)
Then, the coordinates of the remaining vertices are C2 (Rsin Θ, Rcos Θ), C
3 (Rsin2Θ, Rcos2Θ), ……, Cn (Rsin (n-1) Θ, R
cos (n-1)?). However, in practice, it is preferable that n is 8 or more.

Next, the CPU 12 drives the feeding device 8 in S22 to bring the first vertex C1 of the n-gon into the corresponding position under the needle. continue,
In S23, the CPU 12 sets the coordinates (0, R) of the vertex C1 to the starting point coordinates (X, Y) and adds 1 to the count register. In S24, the coordinates of the vertices adjacent to each other in the clockwise direction (initially the coordinates of C2 (Rsin Θ, Rcos Θ)) are set in the end point coordinates (x, y), and then the feeding device 8
The moving direction and the moving amount (that is, the number of steps of the pulse motor) are calculated and obtained. Then, in S25, the CPU 12 drives the pulse motor for the X-axis direction and the pulse motor for the Y-axis direction of the feeding device 8 based on the calculation result.

Then, in S26, the starting point coordinates (X, Y) are rewritten to the same coordinates (Rsin Θ, Rcos Θ) of the vertex C2 as the last end point coordinates, and 1 is added to the count register. In S27, the CPU 12 determines whether or not the count number of the count register has reached a predetermined number (n = 21 in this embodiment). If not reached, the process returns to S24, and if reached, the process proceeds to S14. Therefore, the confirmation drive by the feeding device 8 is coordinate (0,
It will be repeated until the apex of R) reaches the needle down position again, and it will be performed along almost the same outer shape as the outer circumference of the circular area.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be arbitrarily modified without departing from the spirit of the present invention.

(Effect of the Invention) As described in detail above, according to the present invention, after the sewing area is set, the sewing area set by the operator can be visually confirmed by tracing the outer shape of the set area with the embroidery frame. As a result, it is possible to find an inappropriate setting of the sewing area at an early stage and to perform a reliable sewing operation, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is an electric block diagram of an embodiment embodying the present invention, FIG. 2 is a perspective view of a sewing machine, FIG. 3 is a plan view of a confirmation key and a jog key, and FIG. 4 is a rectangular area in an embroidery frame. FIG. 5 is an explanatory view for setting a circular area in the embroidery frame, FIG. 6 is an enlarged view for the same, and FIG. 7 is a flowchart. In the figure, 5 is a needle constituting stitch forming means, 8 is a feeding device,
9 is a mounting arm, 10 is an embroidery frame as a work cloth holding means,
Reference numeral 12 is a central processing control unit (CPU) as a calculation means and a drive control means, and 22 is a confirmation key as a start means.

Claims (1)

[Claims] 1. A stitch forming means for forming a stitch on a work cloth, comprising a vertically moving needle, a work cloth holding means for holding the work cloth, and a relative position between the needle and the work cloth holding means. In an embroidery sewing machine including a feeding device, a sewing area setting means for setting a sewing area on the work cloth held by the work cloth holding means, and an outer periphery of the setting area set by the sewing area setting means. And a drive control means for confirming and driving the feed device based on the drive data; and a drive control of a start signal for causing the drive control means to perform the confirmation drive. An embroidery sewing machine comprising: a starting means to be added to the means.