JPH0441377U

JPH0441377U -

Info

Publication number: JPH0441377U
Application number: JP8338190U
Authority: JP
Priority date: 1990-08-07
Filing date: 1990-08-07
Publication date: 1992-04-08

Description

[Brief explanation of the drawing]

第１図は本考案の１実施例のミシンの斜視図、
第２図は第１図のミシンに使用する上糸把持装置
の概略構成図、第３図は第２図の上糸把持装置の
ソレノイドに電流を流す状態を示した図、第４図
は第２図の上糸把持装置を駆動する駆動装置の回
路図、第５図は第４図のリセツト信号発生回路か
らのリセツト信号とアツプソレノイド信号発生回
路からのアツプソレノイド信号の波形図、第６図
は従来のミシンの斜視図である。２１……上糸把持装置、２２……永久磁石、２
３……アツプソレノイド、２４……ダウンソレノ
イド、２５……プランジヤ、２６……ばね、２７
，２８……ダイオード、２９，３０……トランジ
スタ、３１……アツプソレノイド駆動回路、３２
……アツプソレノイド信号発生回路、３３……ダ
ウンソレノイド駆動回路、３４……リセツト信号
発生回路。 FIG. 1 is a perspective view of a sewing machine according to an embodiment of the present invention;
Fig. 2 is a schematic configuration diagram of the upper thread gripping device used in the sewing machine shown in Fig. 1, Fig. 3 is a diagram showing the state in which current is applied to the solenoid of the upper thread gripping device in Fig. 2, and Fig. 4 Figure 2 is a circuit diagram of the drive device that drives the upper thread gripping device, Figure 5 is a waveform diagram of the reset signal from the reset signal generation circuit of Figure 4 and the up-solenoid signal from the up-solenoid signal generation circuit, and Figure 6. is a perspective view of a conventional sewing machine. 21...Needle thread gripping device, 22...Permanent magnet, 2
3...Up solenoid, 24...Down solenoid, 25...Plunger, 26...Spring, 27
, 28...Diode, 29, 30...Transistor, 31...Up solenoid drive circuit, 32
. . . Up solenoid signal generation circuit, 33 . . . Down solenoid drive circuit, 34 . . . Reset signal generation circuit.

Claims

[Scope of utility model registration request]

In a sewing machine in which upper thread from a thread supply source is fed by a thread feeding device having a feeding roller between a thread presser solenoid and sent to a needle, a reset signal is generated when the power of the sewing machine is turned on or turned off. an up solenoid signal generation circuit that generates an up solenoid signal in response to a signal from the reset signal generation circuit when the power is turned on; and an up solenoid signal generation circuit that generates an up solenoid signal when the power is turned off, and drives the upper thread by a down solenoid signal from the reset signal generation circuit when the power is turned off. A sewing machine characterized in that an upper thread gripping device is provided in the upper thread passageway, the upper thread gripping device having a down solenoid for gripping and an up solenoid for releasing the upper thread in response to an up signal from the up solenoid signal generation circuit when the power is turned on. Upper thread control device.