Abstract: An overlock sewing machine includes: a main body; a needle bar mounted to reciprocate in an axial direction; plural needles positioned at the needle bar; a main feeding mechanism adjusted to control a cloth feeding amount of a main feed dog; a differential feeding mechanism adjusted to control a cloth feeding amount of a differential feed dog; a memorizing device configured to memorize at least one sewing pattern, the memorizing device being provided at the main body; a pattern selecting device provided at the main body and configured to select the at least one sewing pattern memorized in the memorizing device; and a control device provided at the main body and configured to control the selected at least one sewing pattern.

Abstract: An overlock sewing machine includes: a main body; a needle bar mounted to reciprocate in an axial direction; plural needles positioned at the needle bar; a main feeding mechanism adjusted to control a cloth feeding amount of a main feed dog; a differential feeding mechanism adjusted to control a cloth feeding amount of a differential feed dog; a memorizing device configured to memorize at least one sewing pattern, the memorizing device being provided at the main body; a pattern selecting device provided at the main body and configured to select the at least one sewing pattern memorized in the memorizing device; and a control device provided at the main body and configured to control the selected at least one sewing pattern.

Abstract: The over lock sewing machine for forming seams of an over-edge chain stitch and a double-thread chain stitch on a work cloth is provided with a needle bar holding a plurality of needles for forming a seam by a vertical reciprocating movement a plurality of loopers and a needle bar transmitting mechanism moving the needle bar in approximately orthogonal direction relative to a cloth feeding direction of the work cloth and the vertical reciprocating direction of the needle bar. Accordingly, the over lock sewing machine can make various decorative stitches with an over-edge chain stitch function and a zigzag stitch function. Moreover, the over lock sewing machine is capable with operation at a low cost.

Abstract: The over lock sewing machine for forming seams of an over-edge chain stitch and a double-thread chain stitch on a work cloth is provided with a needle bar holding a plurality of needles for forming a seam by a vertical reciprocating movement a plurality of loopers and a needle bar transmitting mechanism moving the needle bar in approximately orthogonal direction relative to a cloth feeding direction of the work cloth and the vertical reciprocating direction of the needle bar. Accordingly, the over lock sewing machine can make various decorative stitches with an over-edge chain stitch function and a zigzag stitch function. Moreover, the over lock sewing machine is capable with operation at a low cost.

Abstract: A sewing machine which includes a main shaft motor for driving a main shaft; a needle bar for moving up and down by rotation of the main shaft motor; a thread exchanging mechanism, having a swinging member swingable by rotation of the main shaft motor, for exchanging a thread by moving a thread barrel having an opening through which a thread is passed, from a standby position to an exchange position; and a controller for controlling the rotation of the main shaft motor.

Abstract: A device for controlling feeding quantity of a sewing machine includes a driver for driving an upper feed-dog and a lower feed-dog, a first setter for setting the feeding quantity of the lower feed-dog, a second setter for setting a ratio of the feeding quantity of the upper feed-dog to that of the lower feed-dog, a first adjuster for adjusting the feeding quantity of the lower feed-dog based on the set value at the first setter, and a second adjuster for adjusting the feeding quantity of the upper feed-dog based on the set value at the first setter and the ratio set at the second setter.

Abstract: An apparatus for conveying an article, as during a sewing operation, includes a pair of driving pulleys supported on a first support simultaneously rotatably by an electric motor and spaced apart from each other transversely of the apparatus and a pair of driven pulleys supported simultaneously rotatably on a second support and spaced apart from each other transversely of the apparatus. A pair of first fixed intermediate pulleys and a pair of first movable intermediate pulleys are supported simultaneously rotatably on the first support below the driving pulleys and between the driving pulleys and the fixed intermediate pulleys, respectively. The second support is spaced apart from the first support longitudinally of the apparatus and the first and second supports are horizontally movable to and away from each other.