Abstract: A thread end holding device for a sewing machine comprises a needle thread catching puller which is swingably supported on the side of a sewing machine arm and is driven to swing between a thread catching position and a home position, and which comprises a hook portion at the tip end thereof for catching a needle thread extending from a needle when said needle thread catching puller is at its thread catching position and holds the needle thread at its home position and first and a second holding members which are respectively mounted on the side of the sewing machine arm and is disengaged from the both clamping portions when the needle thread catching puller is at its thread catching position and enters a gap between the both clamping portions at the hook portion thereof so as to elastically clamp the end of the needle thread between the clamping portions when the needle thread catching puller is at its home position.

Abstract: A wiper for a sewing machine wherein a hook portion formed at the tip end portion thereof comprises an inclined guide portion for contacting an upper thread in the forward stroke of a wiping operation of the wiper so as to guide the upper thread toward the tip end thereof. The wiper has an inclined introduction portion for guiding the upper thread, and has a thread hooking guide portion formed inside the inclined guide portion, for hooking the upper thread.

Abstract: A wiper unit has a supporter secured to the arm of a sewing machine. A stopper is secured to the supporter. A wiper shaft is rotatably supported by the supporter. The stopper restricts the rotation of the shaft. A wiper is mounted on the shaft. The wiper has a wiper arm and a tip end thereof. The tip end has a hook for wiping the tip end of an upper thread. A wiper operation crank is secured to the wiper shaft for adjusting a turning operation thereof relative to the wiper. An operation link is connected by a pin to the operation crank. A driving unit drives the operation crank reciprocally and drives the crank and shaft to turn about the axis of the shaft.

Abstract: A thread end holding unit of a sewing machine employs a needle thread gripping puller driven so as to be positioned either at a thread catch position or a return position. The puller has a hook portion at a tip end thereof adapted for catching a needle thread extended from a needle when the needle thread gripping puller is positioned at the thread catch position. The needle thread is caught and held by the hook at the return position. First and second holding members are respectively fixedly mounted on a supporter fixed to the arm. These holding members have press portions forcibly pushed elastically by both sides of the needle thread gripping puller for pressing and holding the thread end of the needle thread caught by the hook when the hook portion is positioned at the return position.

Abstract: A needle thread drawing device utilizes a thread end holding device rotatably mounted on an arm of a sewing machine. A needle thread gripping puller which can be disposed to be at a thread catch position or a return position has a hook portion at a tip end thereof for catching a needle thread extended downward from a needle hole of a needle. A needle thread drawing member is mounted swingably on the side of the arm and has a hook portion at a tip end thereof. A cam member is positioned at the side of the thread end holding device and is rotatable in synchronism with the puller for rotatably swinging the needle thread drawing member so that the hook portion can hold the needle thread when the needle thread holding portion is positioned over the needle hole of the needle and can draw a thread end of the needle thread when the hook portion of the puller is positioned under the needle hole of the needle when the puller is disposed in the thread catch position.

Abstract: A slackened needle thread assuring unit includes a thread tension member mounted on a side wall of a frame secured to the bed of a sewing machine. A thread takeup is positioned above the thread tension member. A needle/bobbin thread cutter is positioned apart from and under the frame for cutting a needle thread. A thread end holder holds an end of the thread to be cut by the needle/bobbin thread cutter. A thread guide extending across the front portion of the frame has one end supported by a support plate and the other free end defining a hook. A drive mechanism supported by the support plate reciprocally moves the hook in the direction substantially perpendicular to the threading direction of the needle thread.