JPS6175281U

JPS6175281U -

Info

Publication number: JPS6175281U
Application number: JP15935984U
Authority: JP
Priority date: 1984-10-22
Filing date: 1984-10-22
Publication date: 1986-05-21

Description

[Brief explanation of the drawing]

第１図はこの考案の実施例になる下糸検出装置
の回路図、第２図はそのタイミングチヤート、第
３図は構造を示す断面図、第４図はミシンの外観
を表わす斜視図、第５図はセンサー用発光ダイオ
ードおよびセンサー用ホトトランジスタの指向性
を示す特性図である。１……発振器、２……フリツプフロツプ、３，
１０……トランジスタ、４，７……可変抵抗、５
……センサー用発光ダイオード、６……センサー
用ホトトランジスタ、８……遅延回路、９……ブ
リンキング回路、１１……表示用発光ダイオード
、１２……下糸ボビン、１３……下糸、１４……
釜蓋、１５……針棒、１６……ミシン頭部、１７
……下方アーム、１８……釜軸、１９……外釜、
２０……上糸、２１……釜蓋用板ばね、２２……
センサーカバー、２３……中釜、２４……ボビン
ケース、Ｒ……収納室。 Figure 1 is a circuit diagram of a bobbin thread detection device that is an embodiment of this invention, Figure 2 is its timing chart, Figure 3 is a sectional view showing the structure, Figure 4 is a perspective view showing the external appearance of the sewing machine, and Figure 4 is a perspective view showing the appearance of the sewing machine. FIG. 5 is a characteristic diagram showing the directivity of a light emitting diode for a sensor and a phototransistor for a sensor. 1...Oscillator, 2...Flip-flop, 3,
10...Transistor, 4,7...Variable resistor, 5
... Light emitting diode for sensor, 6 ... Phototransistor for sensor, 8 ... Delay circuit, 9 ... Blinking circuit, 11 ... Light emitting diode for display, 12 ... Lower thread bobbin, 13 ... Lower thread, 14 ……
Pot lid, 15...Needle bar, 16...Sewing machine head, 17
... lower arm, 18 ... hook shaft, 19 ... outer hook,
20... Upper thread, 21... Leaf spring for hook lid, 22...
Sensor cover, 23...Inner hook, 24...Bobbin case, R...Storage room.

Claims

[Scope of Claim for Utility Model Registration] 1. A hook that performs a thread catching motion in synchronization with the rotation of the main shaft of the sewing machine, and a cylindrical portion that is attached to a storage chamber formed inside the hook and in which the bobbin thread is wound. In a sewing machine equipped with a bobbin thread bobbin formed of a translucent material and having flanges provided at both ends thereof, in order to detect the bobbin thread in the bobbin thread bobbin installed in the storage chamber, A light emitting part that emits light to the bobbin thread through one of both flanges of the bobbin thread bobbin and a light receiving part that receives the light reflected by the bobbin thread through the one flanged part are disposed in the sewing machine frame, and the light emitting part A current regulator that adjusts the operating current of at least one of the light emitting part and the light receiving part is connected to a current supply circuit for supplying operating current to the light emitting part and the light receiving part, respectively, and the current is detected by the light emitting part and the light receiving part. A lower thread detecting device for a sewing machine, characterized in that the remaining amount of lower thread in the lower thread bobbin is set by adjusting the current regulator. 2. Utility model registration claim 1, characterized in that the current regulator is provided corresponding to the light emitting section and the light receiving section, respectively, in order to individually adjust the operating current of the light emitting section and the light receiving section. A bobbin thread detection device for a sewing machine as described in Section 1.