Abstract: A chain stitch sewing machine comprises a needle for penetrating through a cloth on a throat plate to be vertically moved interlockingly with a main spindle of the sewing machine, thereby holding a needle thread, a cloth presser mounted on the throat plate and serving to press the cloth, a looper having a looper thread for reciprocating in such a direction as to cross a cloth feeding direction below the throat plate interlockingly with the main spindle of the sewing machine, a main feed dog for feeding a loop formed by the needle thread and the looper thread in cooperation of the needle and the looper rearward in the cloth feeding direction, and a loop engagement member for protruding from an upper surface of the throat plate and engaging the loop with the cloth presser when the main feed dog is descending from the upper surface of the throat plate.

Abstract: A pressing portion is formed at one end portion of a horizontal wall portion of a cloth feeding unit, a bed portion is installed with a moving member pressed by the pressing portion and a slide member pressed to move by the moving member, a pivoting lever is pivoted by moving the slide member, a switch lever is switched to a drop position by the pivoting lever and a follower of the switch lever is switched to a position in correspondence with an escape driving cam. At such a time, a contact portion of the moving member is exposed to outside of a machine cover and can be visually observed and an operating portion of the slide member can be observed visually by being exposed to the outside via a notched window.

Abstract: A sewing machine includes a feed dog disposed in a bed of a main body to be displaced between positions above and below a top face of the bed in a normal state to feed a workpiece cloth, and a control device. When a presser foot is vertically moved during sewing, the control device judges that the feed dog is in the drop feed state. The vertical movement of the presser foot is detected on the basis of an output of a cloth thickness sensor which detects the height of the presser foot. When the feed dog is in the drop feed state, the control device judges whether a stitch pattern selected by a user is suitable for formation of stitches in the drop feed state of the feed dog. When the stitch pattern is unsuitable, information to that effect is provided, and the sewing is stopped.

Abstract: An apparatus in combination with a sewing machine having a stitch-former that utilizes thread, alternately engageable and disengageable with a garment having portions of different thickness material, and a feeder for feeding the garment through the stitch-former when the stitch-former is disengaged from the garment, comprises a puller roller, a feed rocker shaft, first and second presser feet and first and second pneumatic cylinders. The puller roller is positioned downstream of the feeder for uniformly pulling the garment when the stitch-former is disengaged from the garment. The feed rocker shaft is clampingly-attached to the feeder for driving the puller roller in synchronization with the stitch-former. The feed rocker shaft intermittently engages the puller roller when the stitch-former is disengaged from the garment and intermittently disengages the puller roller when the stitch-former is engaged with the garment.

Abstract: A side-by-side material feed system is provided for feeding two dissimilar strips of material. The material is fed along parallel feed paths by first and second drive mechanisms which move the material toward respective cutters. The operation of the feed mechanisms and the cutters is controlled by a programmable controller which permits each of the material strips to be fed and cut to form pieces of predetermined length which may be removed by an operator or conveyed to a subsequent station for further processing.

Abstract: A puller device of a sewing machine having a stitch-forming mechanism alternately engageable and disengageable with a garment for stitching the garment and a feed mechanism for feeding the garment through the stitch-forming mechanism. The puller device comprises a puller roller downstream of the feed mechanism for uniformly pulling the garment when the stitch-forming mechanism is disengaged from the garment. The puller device also comprises a feed rocker shaft, clampingly-attached to the feed mechanism, for driving the puller roller in synchronization with the stitch-forming mechanism, intermittently engaging the puller roller when the stitch-forming mechanism is disengaged from the garment and intermittently disengaging the puller roller when the stitch-forming mechanism is engaged with the garment. The puller device includes first and second presser feet positioned adjacent the puller roller for urging the garment against the puller roller.

Abstract: A method and apparatus provided for the automatic production of discrete cuffed sleeve blanks from distinct initial sleeve blanks and a continuous roll of knit cuffing material. The initial sleeve blanks are place end-to-end, a gap is introduced between them, and they are passed in a first direction with a first edge thereof parallel to the first direction. The continuous length of cuffing material is folded over to provide a double thickness having a first edge which is parallel to the sleeve blank first edge, the cuffing material and sleeve blank first edges are overlapped, moved together, and sewn to each other with an "over-edger" automatic sewing machine. The cuffing material is stretched just prior to being fed to the sewing machine, and is stretched again after sewing and severed from the rest of the roll. A driven roller includes non-rotatable washers having projecting portions engaging a blade of the cutting mechanism.

Abstract: A device is disclosed for pulling out and cutting off the needle and looper threads in a sewing machine with a delivery roller for delivering material to the machine sewing station. The delivery roller is driven over a first drive, which is dependent on the sewing machine main drive and over a second drive, which is independent of the sewing machine main drive. On the looper of the sewing machine is secured a cutting blade for the needle thread. Furthermore, a needle thread clamp is provided. In order to manage, with a single means for pulling out the needle and looper threads by different lengths, a cutting device for the looper thread is arranged between the cutting blade and the delivery roller, with a guide which is traversed by a thread inlet groove and with a counterknife for a thread severing knife that moves transverse to the material feeding direction. The delivery roller is driven over the second drive for pulling out the threads.

Abstract: A hem securing method utilizing a narrow bight bar tack in which the bobbin thread appears on the outer face of the hemmed article. The hem is folded and needle penetrations take place from the inner side to draw a bobbin thread selected for a color match and without regard to stitch ability. A sequence of stitches is selected for the bar tack to enhance lock up of the threads so as to permit close trimming of the bar tack with lessened likelihood of unraveling.

Abstract: A mechanism for a sewing machine for enabling the manual or automatic control of the direction and of the amplitude of movement of a transporting claw guide for material to be sewn. The mechanism is driven from the main driving shaft of the sewing machine via a cam and a series of intermediate lever members connected to a rotatable shaft connected to the transporting claw guide. The control is automatically accomplished by means of a cam driven from the main driving shaft of the machine via the arrangement of levers to obtain back-and-forth movement of the claw guide or, when a cam follower is disengaged from the cam, the control can be accomplished manually without the automatic back-and-forth movement.