Abstract: A zigzag sewing machine is provided. The zigzag sewing machine includes a stitching motor which moves a needle, a feeding motor which moves a feed dog to feed a cloth, a needle swinging motor which swings the needle, a multistage-operating portion operable to adjust at least one of a feed amount of the cloth and a swing amount of the needle in a minimum adjustable unit, and a control section which controls the stitching motor, the feeding motor and the needle swinging motor to carry out a zigzag sewing in accordance with the at least one of the feed amount and the swing amount adjusted by the multistage-operating portion. The control section is configured to selectively assign a first value and a second to the minimum adjustable unit depending on whether the stitching motor is in operation or not.

Abstract: A feed generating device for a sewing machine capable of selectively sewing one of a plurality of utility patterns and a plurality of super patterns including a single super feed cam generating a cloth feed for sewing the super pattern, a single or a plurality of feed contacts capable of contacting the super feed cam and a switching mechanism that moves the feed contact to a plurality of contact locations having different swing phases with respect to the super feed cam. The cloth feed for sewing the super pattern is a combination of a forward feed and a backward feed and by moving the feed contact to either one of a plurality of contact locations by the switching mechanism, cloth feed including different patterns of combination of the forward feed and the backward feed are generated.

Abstract: An apparatus for adjusting a timing of a needle and a looptaker of a sewing machine provided at a zigzag sewing machine having an upper shaft for driving a needle bar, a lower shaft for driving a looptaker, a machine frame, and a timing belt for connecting and synchronizing the shafts includes a cam member including a first cam surface and a second cam surface, a first arm member and a second arm member supported by the machine frame and a first pulley and a second pulley mounted to the first arm member and the second arm member respectively and always contacting the timing belt, the first pulley following the first cam surface and the second pulley following the second cam surface.

Abstract: A pattern stitching sewing machine is disclosed, wherein a pattern selecting device including a pattern selecting dial is rotatingly operated to select at least one of a plurality of different patterns pattern. First and second indication means are operated in association with operation of the pattern selecting device to indicate a pattern selected by the pattern selecting and an adjustment scope of the selected pattern with respect to at least one of the stitch width and the work feeding amount respectively.

Abstract: A fabric feeding device for a sewing machine, including a horizontally and vertically reciprocable feed dog, a feed control cam member with a forward and a reverse feed cam for controlling forward and reverse feed distances of the feed dog, a manually operated feed adjusting member for operating the cam member, a control plate operated by the cam member for changing the angle of a feed regulator for adjusting the fabric feed distances, an auxiliary feed cam member operated by a manually operated buttonhole stitching pattern selector member, an auxiliary feed plate positioned by the auxiliary feed cam member and cooperating with the feed control cam member to move the control plate, a buttonhole reverse feed auxiliary cam member operated by the feed adjusting member, and a buttonhole fine feed adjusting lever rotatably supported by a manually operated buttonhole fine feed adjusting masher and positioned by the buttonhole reverse feed auxiliary cam member for positioning the auxiliary feed plate, wherein a smal

Abstract: A safety device for a zigzag sewing machine comprising a swing width adjusting mechanism, a basic line setting mechanism, and a pattern setting mechanism, is made up of: pattern change inhibiting mechanism which, where a basic line other than the middle basic line has been set by the basic line setting mechanism, prevents a regular pattern sewing mode set by the pattern setting mechanism from being changed to an inverse pattern sewing mode; and basic line change inhibiting mechanism which, where an inverse pattern has been set by the pattern setting mechanism, prevents the middle basic line set by the basic line setting mechanism from being changed to other than the middle basic line.

Abstract: A sewing machine has a vertical needle bar pivotable about a point thereon adjacent the upper end and moveable up and down. A sewing needle is detachably secured to the lower end of the bar and has an eye adjacent its lower end. The machine has an adjustable stitch width and, during its operation at a preset width, satisfies the requirement that the eye must be continuously properly positioned with respect to the machine hook at all times. The eye is vertically aligned with the hook point when the eye is in proximity of the hook, so as to insure reliable stitch formation at any selected stitch width. An arrangement for maintaining such proper positioning employs a first stop secured to the bar at a first location thereon intermediate its ends. A second stop is secured to the bar at a second and lower position intermediate its ends. A member is slidable along and is disposed on the bar in the space between the two stops. A spring is disposed on the bar between the first stop and the member.