Juki Corporation

Ando Electric Company

Atsushi Kudo

Tatsuya Ogawa

Shoji Adachi

Takashi Nishikawa

Mitsuhiro Tachikawa

Takuya Hosoda

Sadao Oshima

A sewing machine zigzag pattern changing device comprises: a cam drive shaft (11) supported in a sewing machine frame in such a manner that it can be rotated deceleratingly in linking with a sewing machine main shaft; a needle swing cam (13) supported on the cam drive shaft and including at least two cams which are spaced apart from each other in the axial direction of the needle swing cam and respectively correspond to different needle swing patterns; a needle swing drive shaft (20) disposed in parallel to the cam drive shaft, supported in the sewing machine frame in such a manner that it is capable of swing motion about the axis thereof, and connected to a needle mechanism so that it can move a needle in a direction at right angles to a cloth feeding direction due to the above swing motion; a cam body (50) including a pair of contact bodies separately engageable with and removable from the two cams, capable of transmitting the swing motion of the contact body due to one of the needle swing cams to be engaged to the needle swing drive shaft, and supported on the needle swing drive shaft in such a manner that it can be moved in the axial direction of the needle swing drive shaft; switch means (59) connected to the cam body for moving the cam body in the axial direction of the needle swing drive shaft to one position where one contact member can be engaged with one cam groove as well as to another position where the other contact member can be engaged with the other cam groove; a guide member disposed in parallel to the axial direction of the needle swing drive shaft; and, a member to be guided engageable with the guide member and relatively movable in the axial direction of the needle swing drive shaft.

Zigzag pattern changing device for a sewing machine

A thread cutting device of a sewing machine comprises: a movable knife having a thread pickup portion and being movable between a standby position and a thread pickup position; a fixed knife being movable between a standby position and an operating position close to a needle locating point and cutting sewing threads in cooperation with the movable knife at the operating position; a front stopper for holding the fixed knife at the standby position, wherein the front stopper is released from the fixed knife in the course of the movable knife making a forward movement; and a rear stopper for holding the fixed knife at the operating position, wherein the rear stopper is released from the fixed knife in the course of the movable knife making a backward movement and after the sewing threads have been cut.

Thread cutting device of sewing machine

An apparatus for measuring a radiation characteristic of a laser diode. An AC signal and a step-like DC voltage are applied to the laser diode and the radiant power output thereof is received by a photodiode having an output to which a first amplifier, a transformer, a capacitor and an AC amplifier for extracting the AC signal. The apparatus further comprises a first switch connected between the input of the first amplifier and the capacitor, and a second switch connected between both ends of the transformer. Every time the step-like voltage is stepped up, the first and second switches are closed for a short time as compared with the duration of a step period to protect the measurement from the influence of the change in the DC voltage.

Radiation characteristic measuring apparatus for laser diode

Growing community of inventors

Tokyo, Japan

Atsushi Kudo