Abstract: An upper hook structure for use in conjunction with a lower hook and a needle to form overedge stitches, in which the hook has a hole, a tip curved in the direction of the lower hook and a shoulder formed in a middle position on the upper hook to stop and guide the thread of the lower hook.

Abstract: The invention relates to an apparatus for feeding thread in a sewing machine. The apparatus includes a thread feeding pass, a base tension disc, a thread holding device, an encoder, and a thread feeding device. The thread feeding device includes a presser roller and a feeding roller driven synchronously with a sewing needle. When a predetermined length of thread is fed to a thread take-up lever, the thread holding device is actuated to hold and stop the thread without stopping rotation of the thread feeding rollers such that the thread slips on the feeding rollers.

Abstract: A sewing machine is disclosed herein. The sewing machine comprises a looper rockably supported on the frame of the machine below the throat plate for rocking movement in response to the rotation of the machine shaft and having first and second thread holes, a thread transfer mechanism adapted to move the leading end of a looper thread to a position facing the second thread hole after the leading end of the thread has passed through the first thread hole and a threading device adapted to pass the leading end of the looper thread through the second thread hole.

Abstract: An upper looper for a three thread overedge stitch machine having a hole in its end and having a tip which is curved toward a lower looper to facilitate transfer of the thread of the lower looper onto the upper looper.

Abstract: A detecting device for detecting a thickness of a fabric inserted between a presser foot and a needle plate of a sewing machine includes an electric iron core having an electric coil and inserted at a space between the needle plate and the fabric presser foot, into which a fabric under stitching is fed. Said space is changed by the fabric thickness. The device detects a change in said space and calculates a length of the changed space.

Abstract: A sewing machine is provided with an upper thread dyeing mechanism for dyeing an upper thread a given color while driving the sewing machine. An upper thread feeding mechanism is also provided for the sewing machine and operative in combination with the dyeing mechanism when a stitching operation is initiated or a change in color of the upper thread is required. A predetermined amount of the upper thread, which remains to be located on the sewing machine, is drawn out by the feeding mechanism, while being colored by the dyeing mechanism.

Abstract: An electric motor is supported at one end on a molded plastic electrically non-conducting housing which is slidably mounted on the metallic frame of a sewing machine at the base and which is biased toward the base of a compression spring to set tension in a belt through which the motor drives a pulley on the arm shaft of the sewing machine.

Abstract: A thread is passed through a dyeing apparatus before the thread is supplied to a sewing machine as an upper thread. The dyeing apparatus has a cylinder containing a plurality of coloring members, each coloring member containing a coloring liquid of a different color. The cylinder is rotated by a manually operated dial to select one of the coloring members in accordance with a stitch to be sewn with a sewing machine. A coloring section of the selected coloring member is exposed to the outside of the cylinder for establishing contact between the thread and the coloring section. A heat-set roller is adapted to come into contact with the thread for heat-setting the coloring liquid applied thereto. The contact between the thread and the coloring member and the heat-set roller is actuated in response to operation of the sewing machine.

Abstract: A plastic guide for thread extending from a supply spool to the sewing instrumentalities of a sewing machine is provided with a metal wear bar to engage thread exiting from an opening in the guide and prevent the thread from cutting a groove in the plastic material of the guide at the edge of the opening.

Abstract: An assembly for converting a sewing machine speed controller of the foot operated type to hand operation thereof includes a housing for slidably accepting the speed controller therein. Hand operable speed setting means mounted on the housing are provided for an operator to manipulate so as to set a desired speed, the speed setting means maintaining its set condition. Actuator means are further provided, coupled to the speed setting means and responsive to a set condition thereof for controlling the compression of the speed controller.

Abstract: A portable thread dyeing kit comprises, preferably, a plurality of separate compartments each containing a liquid dye with an integral felt piece inside the compartment, the felt piece reaching into the dye and being soaked with same. Near the top of each compartment is a pair of orifices in opposite side walls of the compartment for transversely passing a needle through the container and through the respective felt piece. Accordingly, as a white thread is passed through the appropriate felt piece, the thread is dyed to the respective color. The device is extremely simple and thus inexpensive to produce as it avoids split arrangement of absorbent pads used for the same purpose in prior art.

Abstract: A conventional ruffling machine, which contemporaneously receives a forwardly moving strip of base material (a.k.a. dust ruffle platform) and an overlying flat faster moving strip of stock material to be ruffled, whch progressively forms a succession of ruffles in said ruffling stock material along a given line and which immediately sews the ruffles to the base material, is provided with one or more (length or speed) measuring rolls engaged with and rotated by said fast moving ruffling material and an indicator actuatable by at least one roll and operative, when actuated, to indicate the actual (length or speed) ratio, between a given length of ruffling material fed rapidly to said machine and the corresponding smaller length of sewn ruffled material delivered more slowly from said machine, and its relationship to a desired ratio.

Abstract: An electrically operated chain stitch sewing maching having a cartridge carrying a spool of thread and a pre-threaded needle mounted in the side of the head, the needle being normally biased in a retracted position within the cartridge and being actuated by a crank arm provided with means for rendering an electrical switch inoperative until the needle is retracted into the cartridge. The bed of the machine is provided with a thread looping subassembly actuated by the needle.

Abstract: A sewing machine having a cartridge containing a spool of thread and a pre-threaded needle mounted inside of the head, the cartridge having the lower end thereof terminating in proximity to the fabric to be worked upon. The cartridge is provided with integral means for receiving a spool carrying ribbon-like material, the cartridge having a channel means integral therewith adjacent the aperture of the cartridge through which the needle passes, the spool of ribbon being so mounted, and the channel so configured, that the natural unwinding tendency of the ribbon automatically positions the ribbon on the fabric in the path of the needle.

Abstract: A blind stitch sewing machine is provided on its cloth carrying arm with a fabric feeler or sensor and a rod system which automatically adjusts the depths of penetration of the fabric by the needle. The sensor may be a single arm lever on a rotatably supported shaft. A second lever may be disposed on the shaft for positioning the cloth bender relative to the needle.