JP2852967B2 - Method of making the variation of the stitch control amount of the sewing machine 1 / f fluctuation - Google Patents
Method of making the variation of the stitch control amount of the sewing machine 1 / f fluctuationInfo
- Publication number
- JP2852967B2 JP2852967B2 JP19059690A JP19059690A JP2852967B2 JP 2852967 B2 JP2852967 B2 JP 2852967B2 JP 19059690 A JP19059690 A JP 19059690A JP 19059690 A JP19059690 A JP 19059690A JP 2852967 B2 JP2852967 B2 JP 2852967B2
- Authority
- JP
- Japan
- Prior art keywords
- sewing machine
- control amount
- variation
- stitch
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000009958 sewing Methods 0.000 title claims description 25
- 238000004519 manufacturing process Methods 0.000 title description 3
- 239000004744 fabric Substances 0.000 claims description 12
- 238000001228 spectrum Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 1
Landscapes
- Sewing Machines And Sewing (AREA)
Description
本発明は、コンピュータミシンに係わり、特にミシン
の縫目制御量のバラツキを1/fのゆらぎとする方法に関
する。The present invention relates to a computer sewing machine, and more particularly, to a method for making a variation in a stitch control amount of a sewing machine 1 / f fluctuation.
従来、ミシンの縫目制御量のバラツキ、例えば布送り
量のバラツキを０（ゼロ）になるようにし、一定の布送
り量が得られるようにしていた。 しかし、その結果として得られる縫い目は、整然とは
しているが、機械縫製に特有のある種の固さ、冷たさを
感じさせる縫い目であった。Conventionally, the variation in the stitch control amount of the sewing machine, for example, the variation in the cloth feed amount is set to 0 (zero) so that a constant cloth feed amount is obtained. However, the resulting seam, while neat, was a kind of firm, cold seam characteristic of machine sewing.
本発明は、コンピュータミシンにおいて、ミシンによ
り縫製される縫目の制御量を、ｉを整数として、定数項
と基本角振動数および基本角振動数のｉ倍の角振動数の
周期関数の和の形であらわし、且つ前記各周期関数の項
を に比例する値の重み付けをした演算式で与えることによ
り、前記角振動数に比例する空間周波数ｆに対して、ミ
シンで縫製される縫目の制御量のバラツキのパワースペ
クトルが1/fの傾向を示すようにしたミシンの縫目制御
量のバラツキを1/fのゆらぎとする方法を提供するもの
で、 更に具体的には、前記縫目制御量が布送り量であり、
また針振幅量であるようにしたコンピュータミシンの縫
目制御量のバラツキを1/fのゆらぎとする方法を提供す
るもので、従来のミシンにより縫製された機械縫製特有
の縫目が与える感覚としてのある種の固さ、冷たさとい
ったものがなくなり、一種の心地よさ、暖かさを感じさ
せる縫目が得られるという作用がある。According to the present invention, in a computer sewing machine, a control amount of a stitch to be sewn by a sewing machine is defined as a constant term, a basic term, and a sum of a periodic function of an angular frequency i times the basic angular frequency. And each term of the periodic function The power spectrum of the variation in the control amount of the stitches sewn by the sewing machine with respect to the spatial frequency f proportional to the angular frequency tends to be 1 / f A method for providing a method of making the variation of the stitch control amount of the sewing machine as 1 / f fluctuation, more specifically, the stitch control amount is a cloth feed amount,
It also provides a method of making the stitch control amount of the computer sewing machine that has the needle amplitude amount a fluctuation of 1 / f, and gives the stitch unique to the machine sewing sewn by the conventional sewing machine. There is an effect that a certain kind of hardness and coldness is eliminated, and a seam that gives a feeling of comfort and warmth is obtained.
以下、本発明を実施例により説明する。 ○1/fのゆらぎの関連事項 実施例の説明に先立ち1/fのゆらぎに関連する事項に
ついて説明する。 今、第１図に示すように、時刻０から時刻t1におい
て、振幅ｘが同図に示すように不規則な値を示す連続す
る波形を考えた場合、フーリエ展開で知られているよう
に、この波形を定数項と基本角振動数をωとして、周期
関数としての角振動数ｊω（ｊ＝１、２、３‥‥）のコ
サイン項、サイン項との和に展開することができ、係数
を含む角振動数ｊωのコサイン項の値をCj、係数を含む
角振動数ｊωのサイン項の値をSjとすると、角振動数ｊ
ωにおけるパワースペクトルPSは、PS＝Cj2＋Sj2で与え
られる。 第１図の波形から、周波数をｆ（ｆ∝ｊω）として、
第２図に示すようにパワースペクトルPSが周波数ｆの逆
数1/fに比例するような分布となる場合、第１図に示す
元の波形は1/fのゆらぎのある波形であると定義され
る。 従って、それとは逆に各角振動数ｊωにおけるコサイ
ン項の値Cj、サイン項の値Sjを適宜に設定し、パワース
ペクトルPS＝Cj2＋Sj2が1/fとなるような波形制御を行
うことにより、1/fのゆらぎのある波形を作ることも可
能である。 最近の研究の結果、そのメカニズムは十分には解明さ
れてはいないが、現象的に1/fのゆらぎのある波形は、
人間に対してある種の心地よさ、安らぎといったプラス
の感情を引き起こす事が知られている。 ○送り量制御の例 本実施例では、ミシンの縫目制御量の例として、布送
り量の例で説明する。布送り量をＦ（ｎ）（n:縫い目の
番号、ｎ＝１、２、３、‥‥）として、本実施例では、
Ｆ（ｎ）を次式で与える。 Ｋ＝360/θａ ここで、 P:基本送り量（単位mm） A:ゆらぎの重み付け Ａ＝0.5P〜Ｐ θa:基本分割角度 実験の結果、１周期360゜を数十から百前後に分割す
る値に設定すると良好な結果が得られた。 θi:乱数 乱数θｉは、θａ・ｎが360゜を越える場合に、制御
量の繰り返しを避けるためにθａ・ｎが360゜のサイク
ルを繰り返す毎にランダムに変化するように加える値で
ある。 パワースペクトル調整用の係数 パワースペクトルは、各角振動数ｉ・θａ（空間周波
数をｆとしてｉ・θａ∝ｆ）の項の送り量の重み付けの
自乗となるので、各項を自乗して得られるパワースペク
トルの傾きが1/fとなるようにこの数値を掛ける。 実用上、（１）式の主要な項をとり、同式を近似的
に、 で表す。 具体的な例として、 P :2.0mm A :1.0mm θi:40゜、70゜、33゜、10゜、８゜、100゜ （ｉ＝１、２、３、４、５、６） θa:4゜ とすると、布送り量は、（１）′式から、 と変化して行く。 この演算結果により、布送り用の制御モータを制御し
て縫製を行う。 その結果、第３図に示すように、布送り量のバラツキ
のパワースペクトルが空間周波数ｆ（ｆ∝ｉ・θａ）に
対して1/fの傾向を示す縫目が得られる。 以上は、布送り量について説明したが、同様にして針
振幅量を制御することにより、針振幅量のバラツキのパ
ワースペクトルが空間周波数ｆに対して1/fの傾向を示
す縫目が得られる。Hereinafter, the present invention will be described with reference to examples. ○ Matters Related to 1 / f Fluctuation Prior to the description of the embodiment, matters related to 1 / f fluctuation will be described. Now, as shown in FIG. 1, when considering a continuous waveform in which the amplitude x shows an irregular value as shown in FIG. 1 from time 0 to time t1, as is known from Fourier expansion, This waveform can be expanded into a sum of a cosine term and a sine term of an angular frequency jω (j = 1, 2, 3 ‥‥) as a periodic function, where ω is a constant term and a basic angular frequency, and a coefficient Let Cj denote the value of the cosine term of the angular frequency jω including S and Sj the value of the sine term of the angular frequency jω including the coefficient.
The power spectrum PS at ω is given by PS = Cj 2 + Sj 2 . From the waveform of FIG. 1, letting the frequency be f (fωjω),
When the power spectrum PS has a distribution proportional to the reciprocal 1 / f of the frequency f as shown in FIG. 2, the original waveform shown in FIG. 1 is defined as a waveform having a fluctuation of 1 / f. You. Therefore, conversely, the value Cj of the cosine term and the value Sj of the sine term at each angular frequency jω are appropriately set, and waveform control is performed so that the power spectrum PS = Cj 2 + Sj 2 becomes 1 / f. Thus, it is possible to create a waveform having a fluctuation of 1 / f. As a result of recent research, the mechanism has not been fully elucidated, but a phenomenally fluctuating waveform of 1 / f
It is known to cause certain feelings of comfort and peace to humans. Example of Feed Amount Control In the present embodiment, an example of the cloth feed amount will be described as an example of the stitch control amount of the sewing machine. In this embodiment, assuming that the cloth feed amount is F (n) (n: the number of the stitch, n = 1, 2, 3, ‥‥),
F (n) is given by the following equation. K = 360 / θa Here, P: basic feed amount (unit: mm) A: weighting of fluctuation A = 0.5P-P θa: basic division angle As a result of the experiment, 360 ° per cycle is divided into several tens to about one hundred. Good results were obtained when set to a value. θi: random number The random number θi is a value added so that θa · n changes randomly every time a cycle of 360 ° is repeated in order to avoid repetition of the control amount when θa · n exceeds 360 °. Power Spectrum Adjustment Coefficient The power spectrum is obtained by squaring each term because the square of the feed amount of the term of each angular frequency i · θa (i · θa∝f where f is the spatial frequency) is obtained. Multiply this number so that the slope of the power spectrum is 1 / f. Practically, taking the main terms of equation (1), approximate the equation, Expressed by As a specific example, P: 2.0 mm A: 1.0 mm θi: 40 °, 70 °, 33 °, 10 °, 8 °, 100 ° (i = 1, 2, 3, 4, 5, 6) θa: Assuming 4 ゜, the cloth feed amount is given by And change. Based on this calculation result, the sewing motor is controlled by controlling the cloth feed control motor. As a result, as shown in FIG. 3, a stitch is obtained in which the power spectrum of the variation of the cloth feed amount tends to 1 / f with respect to the spatial frequency f (f∝i · θa). The cloth feed amount has been described above. By controlling the needle amplitude amount in the same manner, a stitch whose power spectrum of the variation of the needle amplitude amount has a tendency of 1 / f with respect to the spatial frequency f can be obtained. .
以上のように本発明によれば、従来のミシンにより縫
製された機械縫製特有の縫目が与える感覚としてのある
種の固さ、冷たさといったものがなくなり、一種の心地
よさ、暖かさを感じさせる縫目が得られるという効果が
得られる。As described above, according to the present invention, there is no longer a certain kind of firmness or coldness as a sense given by a machine sewing specific seam sewn by a conventional sewing machine, and a kind of comfort and warmth are felt. The effect that the stitch to be made is obtained is obtained.
図面は本発明の実施例に係り、第１図は時刻ｔに対する
振幅の波形の例を示す図、第２図は第１図の波形から各
周波数に対するパワースペクトルの値を求めた結果を示
す図である。 第３図は縫製順序に対する布送り量の関係から各空間周
波数に対するパワースペクトルの値を求めた結果を示す
図である。1 is a diagram showing an example of an amplitude waveform with respect to time t, and FIG. 2 is a diagram showing a result of obtaining a power spectrum value for each frequency from the waveform of FIG. It is. FIG. 3 is a diagram showing the result of obtaining the value of the power spectrum for each spatial frequency from the relation of the cloth feed amount to the sewing order.
Claims (3)
づき針の振幅量および布送り量を制御して縫い模様を形
成するコンピュータミシンにおいて、ミシンにより縫製
される縫目の制御量を、ｉを整数として、定数項と基本
角振動数および基本角振動数のｉ倍の角振動数の周期関
数の和の形であらわし、且つ前記各周期関数の項を に比例する値の重み付けをした演算式で与えることによ
り、前記角振動数に比例する空間周波数ｆに対して、ミ
シンで縫製される縫目の制御量のバラツキのパワースペ
クトルが1/fの傾向を示すようにしたことを特徴とする
ミシンの縫目制御量のバラツキを1/fのゆらぎとする方
法。In a computer sewing machine for forming a sewing pattern by controlling a needle amplitude amount and a cloth feed amount based on sewing pattern data created in advance, a control amount of a stitch to be sewn by the sewing machine is represented by an integer. As a sum of a constant term and a periodic function of a fundamental angular frequency and an angular frequency i times the fundamental angular frequency. The power spectrum of the variation in the control amount of the stitches sewn by the sewing machine with respect to the spatial frequency f proportional to the angular frequency tends to be 1 / f Wherein the variation of the stitch control amount of the sewing machine is made to fluctuate by 1 / f.
徴とする請求項１に記載のミシンの縫目制御量のバラツ
キを1/fのゆらぎとする方法。2. The method according to claim 1, wherein the stitch control amount is a cloth feed amount, and the stitch control amount variation of the sewing machine is fluctuated by 1 / f.
徴とする請求項１に記載のミシンの縫目制御量のバラツ
キを1/fのゆらぎとする方法。3. The method according to claim 1, wherein the stitch control amount is a needle amplitude amount, and the variation of the stitch control amount of the sewing machine is fluctuated by 1 / f.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19059690A JP2852967B2 (en) | 1990-07-20 | 1990-07-20 | Method of making the variation of the stitch control amount of the sewing machine 1 / f fluctuation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19059690A JP2852967B2 (en) | 1990-07-20 | 1990-07-20 | Method of making the variation of the stitch control amount of the sewing machine 1 / f fluctuation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0479982A JPH0479982A (en) | 1992-03-13 |
| JP2852967B2 true JP2852967B2 (en) | 1999-02-03 |
Family
ID=16260700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19059690A Expired - Fee Related JP2852967B2 (en) | 1990-07-20 | 1990-07-20 | Method of making the variation of the stitch control amount of the sewing machine 1 / f fluctuation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2852967B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8186290B2 (en) | 2007-03-20 | 2012-05-29 | Brother Kogyo Kabushiki Kaisha | Sewing machine and computer-readable recording medium with recorded sewing machine control program |
| US10995437B2 (en) | 2018-07-05 | 2021-05-04 | Janome Sewing Machine Co., Ltd. | Coordinate data generator, sewing machine, and non-transitory recording medium |
| US11649575B2 (en) | 2020-03-13 | 2023-05-16 | Janome Sewing Machine Co., Ltd. | Coordinate data creating device and sewing machine |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007181607A (en) * | 2006-01-10 | 2007-07-19 | Juki Corp | sewing machine |
| JP2022170499A (en) * | 2021-04-28 | 2022-11-10 | 株式会社ジャノメ | Coordinate data creation device, sewing machine and program |
-
1990
- 1990-07-20 JP JP19059690A patent/JP2852967B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8186290B2 (en) | 2007-03-20 | 2012-05-29 | Brother Kogyo Kabushiki Kaisha | Sewing machine and computer-readable recording medium with recorded sewing machine control program |
| US10995437B2 (en) | 2018-07-05 | 2021-05-04 | Janome Sewing Machine Co., Ltd. | Coordinate data generator, sewing machine, and non-transitory recording medium |
| US11649575B2 (en) | 2020-03-13 | 2023-05-16 | Janome Sewing Machine Co., Ltd. | Coordinate data creating device and sewing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0479982A (en) | 1992-03-13 |
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