JPH0592090A - Embroidery sewing machine with automatic thread size detecting function - Google Patents

Abstract

PURPOSE:To provide the embroidery sewing machine with the automatic thread size detecting function which can detect automatically thread size of a needle thread used for embroidery sewing, and also, can derive needle position data which becomes thread density being optimal for this thread size, and moreover, can execute sewing at an optimal sewing speed which does not generate a thread breakage. CONSTITUTION:In a bobbin winder base 20 of a multi-needle type embroidery sewing machine, a bobbin winder bar 22 is provided vertically. A bobbin winder bobbin 36 is inserted through this bobbin winder bar 22. In the part of a supporting plate 21 against which the bobbin face of the bobbin winder bobbin 36 is pressed, four pieces of detection switches 25-28 are placed, and in the lower end part of the bobbin winder bobbin 36, a notch (k) for turning on selectively the detection switches 25-28 is formed. The notch (k) is formed in accordance with thread size of a needle thread wound round to the bobbin winder bobbin 36 and it is detected. In accordance with this thread size, optimal thread density and a sewing speed are determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embroidery sewing machine with a thread thickness automatic detection function, and more particularly, to detecting the thread thickness of an upper thread wound around a thread winding, and detecting a thread density optimum for this thread thickness. The present invention relates to a sewing machine in which embroidery is sewn and a sewing machine motor is controlled at an optimum rotation speed for the thread thickness.

[0002]

2. Description of the Related Art Conventionally, a work cloth is provided with a moving mechanism capable of moving in the X and Y directions of a horizontal XY plane, and the work cloth is moved in the X and Y directions based on embroidery data. An embroidery sewing machine having an embroidery pattern formed on it has been put to practical use. By the way, the applicant of the present application divides the embroidery pattern into a plurality of embroidery areas (blocks) in Japanese Patent Publication No. 60-42740, and the position coordinate data of each vertex of these blocks and the reference thread thickness (for example, 1).
(mm) needle thread data for each block is stored based on the position coordinate data and thread density data. The embroidery area data including the number of stitches (thread density) formed in the block by the upper thread is stored. Then, an embroidery pattern storage / reproduction device was proposed in which the embroidery pattern was sewn using the needle position data.

In the case of forming an embroidery pattern on a work cloth by the embroidery sewing machine, when the operator attaches an upper thread having a thread thickness other than the standard thread thickness to the spool, this thread thickness Based on this, the thread density is determined, the thread density is set in the embroidery sewing machine, trial sewing is performed, and then regular sewing is performed. However, when the set thread density is not optimum during the trial sewing, the trial sewing is repeated while changing the thread density. Further, the sewing speed at the time of trial sewing and lock stitching is set based on the operator's intuition and experience based on the thread thickness of the needle thread used.

[0004]

As described above, when an embroidery pattern is formed on the work cloth by the embroidery sewing machine using the embroidery area data, it is optimal for the thickness of the needle thread to be used. Since the trial sewing is repeated until the thread density is determined, there is a problem that the trial sewing work becomes very troublesome and the work efficiency is lowered.

Further, since the sewing speed of the embroidery sewing depends on the intuition and experience of the operator, especially when sewing a stitch having a long stitch length with a thin upper thread, the upper thread is dependent on the sewing speed. There is a problem in that the tension applied to the thread becomes large and thread breakage frequently occurs, resulting in a decrease in work efficiency.

An object of the present invention is to obtain needle position data capable of automatically detecting the thread thickness of a needle thread used for embroidery sewing, and obtaining the optimum thread density for this thread thickness. Another object of the present invention is to provide an embroidery sewing machine with a thread thickness automatic detection function that enables sewing at an optimal sewing speed without thread breakage.

[0007]

An embroidery sewing machine with a thread thickness automatic detection function according to a first aspect of the invention is provided with a thread winding stand equipped with a thread winding, and embroidery sewing is performed using a needle thread supplied from the thread winding. In the embroidery sewing machine configured as described above, a thread thickness detecting means for detecting the thread thickness of the upper thread of the thread wound on the thread spool and outputting a signal related to the thread thickness is provided.

An embroidery sewing machine with a thread thickness automatic detection function according to a second aspect is the embroidery sewing machine with a thread thickness automatic detection function according to the first aspect, in which a thread thickness related signal from the thread thickness detecting means is sent. Using the thread density determining means for determining the thread density when embroidering with the upper thread from the thread winding, the embroidery area data storing means for storing the embroidery area data for applying the embroidery pattern to the embroidery area, and the thread density determination Based on the thread density from the means and the embroidery area data from the embroidery area data storage means,
A needle position calculation means for calculating needle position data for performing embroidery on the embroidery area so that the thread density is obtained.

An embroidery sewing machine with a thread thickness automatic detection function according to a third aspect is the embroidery sewing machine with a thread thickness automatic detection function according to the first aspect, wherein the thread thickness related signal from the thread thickness detecting means is used. Based on this, the motor rotation speed calculation means for calculating the rotation speed of the sewing machine motor when embroidering with the upper thread from the spool and the rotation speed obtained by the motor rotation speed calculation means when embroidering with the upper thread are used. And a rotation speed control means for controlling the sewing machine motor.

[0010]

In the embroidery sewing machine with the automatic thread thickness detecting function according to the first aspect of the invention, the thread thickness detecting means detects the thread thickness of the upper thread of the thread wound on the thread winding stand, and determines the thread thickness. Output the relevant signal.

In the embroidery sewing machine with the thread thickness automatic detection function according to the second aspect, basically the same operation as in the first aspect is performed. Further, the thread density determining means uses the thread thickness related signal from the thread thickness detecting means to determine the thread density when embroidering with the upper thread from the thread winding. The needle position calculation means, based on the thread density from the thread density determination means and the embroidery area data for applying the embroidery pattern stored in the embroidery area data storage means, achieves the thread density determined as described above. The needle position data for embroidering the area is calculated.

The embroidery sewing machine with the thread thickness automatic detection function according to the third aspect of the invention basically operates in the same manner as that of the first aspect. Further, since the motor rotation speed calculation means calculates the rotation speed of the sewing machine motor when embroidering with the upper thread from the thread winding, based on the thread thickness related signal from the thread thickness detection means, the rotation speed control is performed. The means is, when embroidering with the upper thread,
The sewing machine motor is controlled so that the rotation speed is obtained by the motor rotation speed calculation means. When the number of rotations of the sewing machine motor is calculated as a number of rotations that does not cause thread breakage based on the thread thickness related signal, embroidery sewing can be performed using the upper thread of this thread thickness without thread breakage.

[0013]

According to the embroidery sewing machine with the automatic thread thickness detecting function according to the first aspect of the invention, as described in the section [Operation], the thread thickness of the upper thread of the thread wound is detected and the thread thickness is detected. Since the thread thickness detecting means for outputting a signal related to the thickness is provided, this thread thickness related signal can be used for various controls necessary for embroidery sewing.

According to the embroidery sewing machine with the thread thickness automatic detection function according to the second aspect, basically the same effect as that of the first aspect can be obtained. In addition, since the thread density determination means, the embroidery area data storage means, and the needle position calculation means are provided, it is possible to obtain the optimum thread density for the thread thickness of the upper thread, and to achieve this thread density. Since the position data is required, the embroidery pattern can be sewn neatly without any trial sewing, and the work efficiency can be greatly improved.

According to the embroidery sewing machine with the thread thickness automatic detection function according to the third aspect, basically the same effect as that of the first aspect can be obtained. In addition, since the motor rotation speed calculation means and the rotation speed control means are provided, the sewing machine motor is controlled at a motor rotation speed that does not cause thread breakage, for example, according to the thread thickness of the needle thread. It can be used for embroidery sewing without thread breakage, and work efficiency can be greatly improved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a multi-needle type embroidery sewing machine. Multi-needle embroidery sewing machine 1
The sewing machine table 2 will be described with reference to FIG.
A sewing machine arm 3 is arranged on the upper side, and a needle bar support case 4 which supports five needle bars 5 so as to be vertically movable is attached to the front end of the sewing machine arm 3 so as to be movable in the left and right directions. Sewing needles 6 are attached to the lower ends of these needle bars 5, and the needle thread 37 supplied from the thread winding 35 passes through the corresponding thread tensioner 7 and the balance 8 and the sewing needle 6
Are supplied to each.

The needle bar support case 4 is moved in the left-right direction by driving the needle bar changing motor 9, and is moved to a driving position to reciprocate vertically by driving the sewing machine motor 10. Be moved. A sewing machine bed 11 is provided at the front end of the sewing machine table 2 so as to extend forward. Inside the sewing machine bed 11, a thread for forming a stitch on the work cloth W in cooperation with the vertical movement of the sewing needle 6. A wheel catcher (not shown) is provided.

Inside the sewing machine table 1, 1
A pair of Y-direction moving arms (only one is shown) 12 are provided so as to be movable in the Y-direction (front-back direction) in the XY plane by a Y-direction feed motor 13 (see FIG. 6). Protrudes upward at both left and right ends of the sewing machine table 2 so as to face the upper surface.

A support member 14 extending in the left-right direction is fixed between the upper ends of the pair of Y-direction moving arms 12, and an X-direction moving arm 15 is attached to the support member 14 in the X-direction feed motor 16 (see FIG. 6). Is provided so as to be movable in the X direction (horizontal direction) within the XY plane. Further, an embroidery frame 17 for detachably mounting the work cloth W is attached to the front end of the X-direction moving arm 15. Therefore, the work cloth W mounted on the embroidery frame 17 is moved by the Y-direction feed motor 13
X which is moved in the Y direction by the Y-direction moving arm 12 driven by
The work cloth W is moved in the X direction by the direction moving arm 15.
Various embroidery patterns such as letters and figures are formed on the top.

Next, the bobbin winding base 20 placed on the upper side of the sewing machine arm 3 and capable of supporting the five bobbins 35 will be described with reference to FIGS. 1 and 2. The bobbin winding base 20 is placed and fixed on the upper side of the sewing machine arm 3. The lower ends of the five bobbin winding rods 22 extending in the vertical direction are fixed to the supporting plate 21 at predetermined intervals, and the bobbin winding 35 is formed in a through hole formed by penetrating in the vertical direction. The thread winding rod 22 is inserted and attached. Further, when the thread winding 35 is mounted on the thread winding rod 22, the protrusion 22a is formed on a part of the outer peripheral surface of the thread winding rod 22 so that the mounting phase of the thread winding 35 on the thread winding rod 22 is always a predetermined phase. 3 spools formed over
In the through hole formed in the bobbin 36 of No. 5, the protrusion 2
A recess that can be engaged with 2a is formed. A support arm 31 is provided on the upper side of the sewing machine arm 3. The support arm 31 is provided with a guide member 30 for guiding the upper thread 37 fed from each of the five thread windings 35.

At the time of embroidery sewing, the spool 35 to the upper thread 37
In order to prevent the bobbin winder 35 from moving upward when the bobbin is fed upward, the support plate 21 is provided with a circular step drop portion 23 for pressing and holding the outer peripheral portion of the lower end of the bobbin 36. 22 are respectively formed. Also, spool 3
The first detection switch 25, the second detection switch 26, and the third detection switch are provided at the predetermined phase portion of the outer peripheral portion of each step drop portion 23 with which the lower end portion of the bobbin 36 comes into contact when the bobbin 5 is mounted on the bobbin winding 22. 27 and a fourth detection switch 28 are provided in a predetermined order. In addition, the thread winding rod 2 on the left side of the front row
The four detection switches 25 to 28 corresponding to 2 are a first switch group G1 (see FIG. 6), and the bobbin winding rod 2 on the left side in the rear row is used.
The four detection switches 25 to 28 corresponding to No. 2 are the second switch group G2, the four detection switches 25 to 28 corresponding to the central bobbin winding 22 in the front row are the third switch group G3, and the right winding bobbin in the rear row is The four detection switches 25 to 28 corresponding to 22 are set as a fourth switch group G4, and the four detection switches 25 to 28 corresponding to the spool pin 22 on the right side in the front row.
28 is a fifth switch group G5.

Further, the bobbin 36 of each bobbin 35 has a lower end portion corresponding to the first to fourth detection switches 25 to 28 according to the thickness of the upper thread 37 wound on the bobbin 35. A unique notch k is formed. That is, for example, as shown in FIG. 3, the needle thread 37 (D
Bobbin 36 (D) of spool 35 (D1) wound with 1)
In 1), the notch k1 corresponding to the first to third detection switches 25 to 27 is formed, and the upper thread 37 (D2) having a thread thickness of "0.6 mm" is wound as shown in FIG. Spool 35
A notch k2 corresponding to the first and second detection switches 25 and 26 and a notch k3 corresponding to the fourth detection switch 28 are formed in the bobbin 36 (D2) of (D2), and FIG.
As shown in FIG. 5, the needle thread 37 (D
Bobbin 36 of bobbin 35 (D12) wound with 12)
A notch k4 corresponding to the third and fourth detection switches 27 and 28 is formed at (D12). In addition, although not shown, many thread thicknesses (“0.7 mm”, “0.8 mm”, “0.
9 mm "," 1.0 mm "," 1.1 mm ", ...) Each of the bobbins 36 has a unique notch k.

Therefore, the needle thread 37 (D
When the thread winding 35 (D1) wound with 1) is attached to the thread winding rod 22, the first to third detection switches 25 to 27 of the four detection switches 25 to 28 corresponding to the thread winding rod 22 have the cutout k1. Thus, the switch signal of "0" is output, and the fourth detection switch 28 outputs the switch signal of "1". Similarly, when the bobbin winder 35 (D2) having a thread thickness of "0.6 mm" is mounted, the first, second, and fourth detection switches 25, 26, and 28 output the switch signal of "0" by the notches k2 and k3. The third detection switch 28 outputs the switch signal of "1". When the thread winding 35 (D12) having the thread thickness of "1.6 mm" is mounted, the first and second detection switches 25 and 26 output the switch signals of "1" respectively, and the third and fourth detection switches 27・
28 outputs the switch signal of "0" respectively by the notch k4.

Next, the control system of the embroidery sewing machine M is constructed as shown in the block diagram of FIG. An operation panel 40 provided with a large number of switches such as a start / stop switch for instructing start / stop of embroidery sewing, a pattern selection switch for selecting an embroidery pattern, and a thread color switch for setting a thread color. A first to fifth switch groups G1 to G5, a drive circuit 41 for the sewing machine motor 10, a drive circuit 42 for the X direction feed motor 16, and a drive circuit 43 for the Y direction feed motor 13. A drive circuit 44 for the needle bar changing motor 9 and a floppy disk controller (FDC) 46 for a floppy disk drive (FDD) 45 in which a floppy disk can be attached / detached are connected to an input / output interface 47 of the controller C, respectively. Has been done.

A floppy disk (not shown) detachably attached to the floppy disk drive 45 stores a plurality of types of embroidery area data (pattern contour data) such as characters and figures in association with embroidery pattern numbers. An embroidery data memory 55 is provided. Each of the embroidery area data stored in the embroidery data memory 55 includes color number data for designating the thread color of the upper thread 37, thread density data for designating the number of sewing threads, block coordinate data for a plurality of blocks, Feed data for instructing the movement of the work cloth W and the like are stored. For example, the embroidery pattern 6 shown in FIG.
As shown in FIG. 8, the embroidery area data for 0 is the color number data C3 (blue) for the outer first pattern A and the thread density when the upper thread of the reference thread thickness (for example, about 1 mm) is used. Data (E5), coordinate data of block A1 (embroidery area data), coordinate data of block A2, ... Block A
18 coordinate data, feed data, inner second pattern B
The color number data C5 (purple) and the yarn density data (E
8), the coordinate data of the block B1, the coordinate data of the block B2, ... The coordinate data of the block B18 are stored.

By the way, as the block coordinate data, for example, in the case of the block A1 as shown in FIG.
Four block defining points a that define a quadrangle (block)
It is composed of coordinate data of 11, a12, a13, a14 and number data attached to these block defining points. However, regarding the block A2, two block defining points a21 and a22 out of the four block defining points a21, a22, a23 and a24 are the same as the two block defining points a13 and a14 of the block A1.
It is composed of two block defining points a23 and a24. The same applies to blocks A3 to A18.

The controller C has a CPU 49 and a CPU 49.
And an input / output interface 47, a ROM 50, and a RAM 51, which are connected to each other via a bus 48 such as a data bus. In the ROM 50, each motor 9/10
A drive control program for driving 13 and 16 and a control program for embroidery sewing control, which will be described later, peculiar to the present application, are stored. The RAM 51 has a data memory for storing the embroidery area data read from the embroidery data memory 55,
A developed data memory for storing needle position data (one stitch data) developed based on the embroidery area data, a buffer for temporarily storing the calculation result calculated by the CPU 49, a counter, a pointer, a flag memory, and the like are provided. .. Further, in the ROM 50, as shown in FIG. 10, a table 56 of switch data (hexadecimal number) determined by a combination of switch signals input from the four detection switches 25 to 28, and these switches as shown in FIG. Data and thread thickness data (D1, D2, D3 ... D12)
And the thread thickness table 57 corresponding to each other, and thread thickness data (D1, D2, D3 ... D12) as shown in FIG.
And a maximum rotation speed table 58 that associates the maximum rotation speed (rpm) of the sewing machine motor 10 with each other.

Next, an embroidery sewing control routine executed by the controller C of the embroidery sewing machine 1 will be described with reference to the flowchart of FIG. In the figure, reference numeral Si
(I = 10, 11, 12 ...) is each step.
However, prior to the start of this control, the pattern number of the embroidery pattern is designated from the operation panel 40, the embroidery area data of the designated pattern number is read from the embroidery data memory 55 of the floppy disk, and the data of the RAM 51 is read. It is assumed to be stored in memory.

When the start switch on the operation panel 40 is operated, this control is started. First, with respect to the first switch group G1 to the fifth switch group G5, each switch group G1 to G
The switch signals of the four detection switches 25 to 28 of No. 5 are sequentially read, and the switch data corresponding to these four switch signals are determined based on the switch data table 56 (S10). Next, based on the switch data and the thread thickness table 57, the needle bar number of each needle bar 5 and the thread thickness data are associated with each other and stored in the buffer of the RAM 51 (S11). For example, as shown in Table 1 below, a needle bar / thread thickness correspondence table in which needle bar numbers “1” to “5” are associated with thread thickness data is created in the buffer.

[0030]

[Table 1]

Next, on the operation panel 40, the thread color of the thread winding 35 mounted on the thread winding base 20 is set corresponding to each needle bar 5, and the set color number data is buffered corresponding to the needle bar number. (S12). For example,
As shown in Table 2 below, a needle bar / thread thickness / thread color correspondence table is created in the buffer.

[0032]

[Table 2]

Next, based on the embroidery area data stored in the data memory of the RAM 51, the number N of patterns is obtained by adding "1" of the number of feed data (S1).
3), "1" is set to the pattern pointer P to indicate the first pattern
Is set (S14). Next, this pattern pointer P
The thread density data E included in the n-th pattern embroidery area data designated by is read (S15), and based on the needle bar / thread thickness / thread color correspondence table in Table 2, the pattern pointer P is used. Thread thickness data D of the needle bar number corresponding to the color number data included in the instructed nth pattern is obtained (S1).
6).

Next, by dividing the thread density data E by the thread thickness data D, the corrected thread density data ES corresponding to the thread thickness D with the thread thickness of "1.0 mm" as a reference is obtained. The corrected thread density data ES is stored in place of the thread density data E of the nth pattern pointed by the pattern pointer P (S17). Next, based on the maximum rotation speed table 58, the maximum rotation speed corresponding to the thread thickness data D is read,
It is inserted and stored next to the corrected yarn density data ES of the nth pattern pointed by the pattern pointer P (S18).

Next, using the corrected thread density data ES, all the block coordinate data of the n-th pattern pointed by the pattern pointer P is expanded into needle position data (one stitch data) and stored in the expanded data memory. (S19). Next, the feed data stored next to the nth pattern designated by the pattern pointer P is read out and stored in the expanded data memory (S20), and the pattern pointer P is incremented by 1 (S21). When the value of the pattern pointer P is smaller than the number N of patterns (S22: No), S15
~ S22 is repeated. For example, as shown in FIG. 14, the embroidery area data of the embroidery pattern 60 including the first pattern A and the second pattern B shown in FIG. 1 ", it is expanded into a plurality of stitch data, and with respect to the second pattern B, it is expanded into the maximum rotation speed data, needle bar number data" 3 ", and a plurality of stitch data and stored in the expanded data memory.

When the value of the pattern pointer P becomes larger than the number N of patterns (S22: Yes), the rotation speed of the sewing machine motor 10 is determined based on the stitch data and the maximum rotation speed data stored in the expanded data memory. , The embroidery stitches are sequentially formed while being limited by this maximum number of revolutions (S2
3) When the embroidery sewing based on all the stitch data ends, this control ends.

As described above, each thread winder 35 is provided with the unique notches k1, k2, k3, k4, ... For identifying the thickness of the upper thread 37 wound around it. Since the notch k is detected by the first to fourth detection switches 25 to 28, the thread thickness of the upper thread 37 of the bobbin winder 35 can be detected, and the first to fourth detection switches 25 to 2 can be detected.
The thread thickness data can be obtained based on the switch data from the first to fifth switches G1 to G5 provided with 8.

Further, using this thread thickness data, the optimum thread density when embroidering with the upper thread of this thread thickness is corrected,
Since the needle position data of each block coordinate data is obtained using this corrected thread density, the embroidery pattern can be sewn neatly without any trial sewing, and the working efficiency can be greatly improved. In addition, based on this thread thickness data, the sewing machine motor 10 is controlled at an optimum rotation speed that does not cause thread breakage when embroidering with an upper thread of this thread thickness. Embroidery can be sewn without thread breakage, and work efficiency can be greatly improved.

Instead of the notch k, it is also possible to attach a light reflecting seal such as a metal foil to the bobbin 36 and detect the light reflecting seal by an optical sensor. A bar code for identifying the thread thickness of the upper thread 37 wound around the bobbin 36 of the thread winding 35 is marked, and a bar code reader for reading the bar code is provided on the thread winding base 20. It is also possible to configure such that the bar code reader reads these bar codes by rotating the spool pin 20 by a predetermined angle. It is also possible to directly detect the thread thickness of the upper thread 37 of the bobbin 35 with an electronic camera or the like.

[Brief description of drawings]

FIG. 1 is a perspective view of a multi-needle type embroidery sewing machine.

FIG. 2 is a partially cutaway and partially enlarged perspective view of the bobbin winding base.

FIG. 3 is an explanatory diagram illustrating the shapes of notches formed in the bobbin of the bobbin and the operating states of the first to fourth detection switches.

FIG. 4 is an explanatory diagram illustrating the shapes of notches formed in the bobbin of the bobbin and the operating states of the first to fourth detection switches.

FIG. 5 is an explanatory diagram illustrating the shapes of notches formed in the bobbin of the thread winding and the operating states of the first to fourth detection switches.

FIG. 6 is a block diagram of a control system of an embroidery sewing machine.

FIG. 7 is an exemplary diagram of an embroidery pattern including two patterns.

FIG. 8 is an explanatory diagram illustrating a data structure of embroidery area data stored in an embroidery data memory.

FIG. 9 is an explanatory diagram illustrating block coordinate data.

FIG. 10 is a diagram illustrating a switch data table in which switch signals of first to fourth detection switches and switch data formed of these switch signals are associated with each other.

FIG. 11 is a diagram illustrating a thread thickness table in which switch data and thread thickness data are associated with each other.

FIG. 12 is a diagram illustrating a maximum rotation speed table in which thread thickness data and maximum rotation speeds are associated with each other.

FIG. 13 is a schematic flowchart of a routine for embroidery sewing control.

FIG. 14 is an explanatory diagram illustrating a data configuration of needle position data developed based on block coordinate data.

[Explanation of symbols]

 1 Embroidery sewing machine 20 Thread winding stand 25 First detection switch 26 Second detection switch 27 Third detection switch 28 Fourth detection switch 35 Thread winding 37 Upper thread 49 CPU 50 ROM 51 RAM C Controller FDD Floppy disk drive k Notch

Claims (3)

[Claims] 1. An embroidery sewing machine including a thread winding stand equipped with a thread winding and configured to perform embroidery sewing using an upper thread supplied from the thread winding, wherein a thread thickness of an upper thread of the thread winding attached to the thread winding stand. An embroidery sewing machine with a thread thickness automatic detection function, which is provided with thread thickness detection means for detecting the thickness and outputting a signal related to the thread thickness. 2. A thread density determining means for determining a thread density when embroidering with an upper thread from the thread winding by using a thread thickness related signal from the thread thickness detecting means, and an embroidery pattern in an embroidery area. On the basis of the embroidery area data storage means for storing embroidery area data to be applied, the thread density from the thread density determination means, and the embroidery area data from the embroidery area data storage means,
2. An embroidery sewing machine with a thread thickness automatic detection function according to claim 1, further comprising: needle position calculation means for calculating needle position data for embroidering the embroidery area so as to obtain the thread density. .. 3. A motor rotation speed calculation means for calculating the rotation speed of the sewing machine motor when embroidering with an upper thread from the thread winding, based on a thread thickness related signal from the thread thickness detection means, and a motor rotation speed calculation means therefor. 2. A thread thickness automatic detection function according to claim 1, further comprising rotation speed control means for controlling the sewing machine motor so that the rotation speed is obtained by the motor rotation speed calculation means when embroidering with threads. Embroidery sewing machine.