Abstract: Since a solenoid device generates the maximum drawing force at the final position of the retracting stroke of a plunger when it retracts into the solenoid device, the drawing force becomes so large at a position close to a pressing end position of a pressing member that energy is consumed than necessity, and the solenoid device is made large-sized. Accordingly, an arch clamp foot lifting apparatus of the present invention solved this problem by connecting a wedge-shaped block member to a plunger of the solenoid device and retaining an upper portion of the pressing member on a cam surface of a block member through a driven portion.

Abstract: When arch clamp feet are replaced with other, set screws fastening a retaining plate are all removed, and the same set screws are fastened again to the retaining plates after the replacement of the arch clamp feet, which takes time and labor. Accordingly, the replacement of the arch clamp feet involved in the change of working process in a sewing mill, causes the deterioration of the rate of operation. A arch clamp foot pressing device is provided with a carrying unit which moves arch clamp foot lifting levers substantially horizontally along axes connecting between tip end portions and base end portions of the arch clamp foot lifting levers while it is guided by a pin, wherein the arch clamp foot lifting levers are moved in the direction of the base end portions by the carrying unit so that the tip end portions of the arch clamp foot lifting levers are disengaged from slots of arch clamp feet.

Abstract: An apparatus for monitoring consumption of a supply of thread includes entry keys for allowing a user to input an initial supply of thread, and a minimum allowable supply of thread, and a detector for providing signals indicative of the rate of thread consumption. The apparatus also includes a control circuit for receiving the initial supply, the minimum allowable supply, and the signal indicative of the rate of thread consumption. The control circuit then calculates a consumed amount of thread and an actual supply of thread remaining, and produces a display signal indicative of the actual supply and/or the consumed amount, and an alarm when the actual supply of thread is equal to or less than the minimum allowable supply. The apparatus further includes a display panel for displaying the actual supply and the consumed amount upon receipt of the display signal from the control circuit.

Abstract: A sewing machine is provided with a workpiece clamping unit which clamps and carries a workpiece along the surface of the bed during stitching operation, and a workpiece clamping unit driving mechanism comprising a driving means and a motion converting means. The driving means comprises first and second drive shafts, first and second driving sources for driving the first and the second drive shaft, and first and second compound plate cams fixedly mounted respectively on the first and the second drive shafts. The motion converting means converts the angular motions of the first and the second drive shaft into motions parallel to the upper surface of the bed (6) of the sewing machine.

Abstract: A needle thread restraining device in a thread cutting sewing machine comprising a needle thread restraining device 18 which is disposed on a needle thread path between a needle take-up mechanism (5) and a needle thread supplying source (6) for setting the tension of the needle thread 4 to substantially zero when the thread cutting mechanism (9) does not operate and to a given value when the thread cutting mechanism (9) operates, and a tension nullification means 31 for setting the tension applied by a tension regulator (10) to a given value when the thread cutting mechanism (9) does not operate and for nullifying the tension applied by the tension regulator when the thread cutting mechanism operates. The amount of the needle thread to be drawn under the work can be set properly and independently, nullifying of the tension set by the tension discs when the sewing thread is cut by the thread cutting mechanism.

Abstract: A presser regulating thumb screw device of a sewing machine screwed into an arm ?2! of the sewing machine and including a presser regulating thumb screw ?18!, the pressure regulating thumb screw ?18! being turned clockwise or counter clockwise for regulating to increase or decrease a pressing force by a presser foot ?6!, wherein the presser regulating thumb screw ?18! comprises a screw body ?8! and a fitting member ?9! fitted in the screw body ?8!, the screw body ?8! is bored in a central axis thereof to form a small diameter fitting hole ?8a!, a large diameter receiving hole having a diameter larger than that of the fitting hole ?8a!, and a spot facing part ?8c! extending from the large diameter hole ?8b! having a diameter larger than that of the large diameter hole ?8b!, the small diameter fitting hole ?8a!, the large diameter fitting hole ?8b! and the spot facing part ?8c! are arranged in an ascending order, and wherein the fitting member ?9! is fixed to the spot facing part ?8c! so as not to turn relative

Abstract: A needle clamping mechanism capable of preventing tip end positions of a pair of needles from being set back or forth and right or left, thereby obtaining excellent sewing performance.

Abstract: A bed slide comprises a bed slide body which is slidably provided on the bed, and a closing plate being disposed at a portion adjacent to the bed slide body in a sliding direction thereof, wherein the closing plate is placed on a stage surface of the bed, and is supported by the bed slide body with a hinge device to be opened or closed.

Abstract: A presser foot device comprises a presser foot shank ?2! which has clamp member through holes ?2d! for guiding clamp members in moving forward and backward formed at the lower portion thereof and a groove for receiving the hinge pin ?3b! of a presser foot plate ?3! formed on the lower surface of the front side thereof and a groove ?2a! for receiving the hinge pin ?3b! of a presser foot plate ?3! therein formed on the lower surface of the front side thereof, and which is detachably attached to a presser bar ?5,! an elastic ?9! member which is fixed to the rear portion of the presser foot shank ?2! at one end portion thereof, and the clamp members ?7! each having a hook portion ?7a! for retaining the hinge pin ?3b! of the presser foot plate ?3! at the tip end portion thereof, wherein the hinge pin ?3b! of the presser foot plate ?3! is elastically clamped by the hook portions ?7a! of the clamp members ?7! and the rear wall ?2c! of the groove ?2a!.

Abstract: A feeding mechanism of an eyelet-end buttonhole sewing machine comprising a bed shaft rotatably supported by a bed, a rapid feed shaft rotatably supported by the bed, a pattern wheel shaft being rotatably supported by the bed and driven by the rapid feed shaft, and a feed wheel being rotatably supported by the bed and driven by the pattern wheel shaft for giving rapid feed to a cloth to be sewn in a forward and backward direction, and also being rotatably driven by the bed shaft for giving rapid feed to the cloth to be sewn in a forward and backward direction involved in a sewing step, the feeding mechanism further comprising a rotary driving source being rotatably driven normally and reversely, a bed shaft rotary member being rotatably driven normally and reversely by the rotary driving source, a rapid feed rotary member being fixed to the rapid feed shaft and retained by the bed shaft rotary member so as to be reversely rotated therewith, a one way sewing clutch for transmitting only a normal rotation of th

Abstract: A right looper release mechanism in an overlock sewing machine is disclosed comprising a vertically movable needle having a needle thread, a right looper disposed under the vertically movable needle and reciprocally movable in a direction crossing the vertically movable needle, a rear driving lever attached to the right looper and engaged in a right looper shaft so as to be freely turned relative thereto, a front driving lever fixed to the right looper shaft, a fixing screw member inserted in a throughhole of the front driving lever so as to be freely turned, said fixing screw member having a male screw being screwed into a female screw 3a of the rear driving lever so as to transmit a motion of the right looper shaft to the rear driving lever by way of the front driving lever, and an elastic member for elastically biasing the fixing screw member in a direction to release the fixing screw member so as to be unscrewed from the female screw of the rear driving lever.

Abstract: A thread cutting device of a sewing machine comprising a groove defined in a sewing machine, the groove extending back and forth and having an opening at a back end thereof, a plurality of thread cutting blades having inclined grooves along which each piece of thread cutting blades can be broken off every given interval, wherein a tip end of each thread cutting blade is disposed to across an intermediate portion of the groove, and the each thread cutting blade is fixed to the sewing machine by way of a detachable fixing means.

Abstract: In a presser foot unit for a sewing machine, a holding member including a presser foot holding knuckle is provided. A presser foot having a pair of knuckles at the back end of the presser foot is also included. The knuckles on the presser foot are spaced apart to receive the presser foot holding knuckle. A presser foot support pin extends through the pair of knuckles on the presser foot and also through a groove in the presser foot holding knuckle, thereby mounting the presser foot to the holding member such that the presser foot can pivot about the support pin. The presser foot holding knuckle also forms curved protrusions that engage the pair of knuckles on the presser foot, such that the presser foot is constrained from moving laterally relative to the holding member. In addition, a spring is supported by the holding member for biasing the presser foot against a piece fabric during operation of the sewing machine.