US1065941A - Strip-cutting attachment for sewing-machines. - Google Patents

Description

J. HOLTZMANN. STRIP CUTTING ATTACHMENT FOR SEWING MACHINES.

APPLICATION TILED NOV. 25, 1912.

Patented July 1, 1913,

2 SHEETS-SHEET 1.

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STRIP CUTTING ATTACHMENT FOR SEWING MACHINES.

APPLICATION FILED NOV 25, 1912.

Patented July 1, 1913.

2 SHBETS $HBET 2.

JOHN HoLrzMAnN, or BALTIMORE, MARYLAND.

STRIP-CUTTING ATTACHMENT son SEWING-MACHINES.

Specification of Letters I'atent.

Patented July 1, 1913.

Application filed November 25, 1912. Serial No. 733,455.

To all whom it may concern Be it known that I, JOHN HOLTZMANN, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented or discovered certain'new and useful Improvements in Strip-Cutting Attach ments for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has for its object to provide a cutting attachment for sewing machines whereby a strip of fabric which may be of suflicient length to be applied to several pieces of work passing through a sewing machine may be severed at any desired point, so that the successive pieces of work which might be otherwise connected together by a continuous strip will be separated from each other.

To this end the invention comprises acutting device which is' mounted on the head or face-plate of a sewing machine, and which includes a knife or cutting blade disposed at a right angle to or across the direction of the feed of the material through the machine, the said cutting blade being thus above the strip to be severed.

The throat-plate or work-plate of the machine is provided with a slot the edge or edges of which will act'as a ledger blade cotiperating with the knife or blade above referred to in such a manner that when the said knife or blade is depressed by the operative the strip passing beneath the said knife or blade will "be severed.

The invention also preferably comprises certain work-guiding and folding devices by which strips of fabric may be' properlv folded and guided to a stitch-forming mechanism comprising a plurality of needles and cooperating loop-taking devices, thereby adapting the invention to special kinds of work, as will hereinafter "more fully apear.

p In the accompanying drawings Figure l is a perspective view of a portion of a sewing machine embodying the present invention. Fig. 2 is a rear side view of the same. Figs. 3 and 4 are detailviews of cutting blades or knives such as will preferably be employed in carrying the invention into effect.

Referring to the drawings, 12 denotes the bracket arm and 13 the work-plate of a sewing machine which may be of any suitable construction, but which, as herein shown, is

of a multiple-needle type for simultaneously forming a plurality of parallel seams. To this end the vertically reciprocating needlebar 14 is provided at its lower end with a cross-head or clamp to which the several needles 15 are secured, and which needles cooperate with loop-taking devices (not shown) which are beneath the work-plate, and which may be of any well-known or suitable form. Cooperating with the stitch-forming devices is a resser-foot 16 carried by a presser-bar 17 which may be raised, when the work is to be inserted or removed, by means of a lever 18 connected with a rod 19 adapted to be connected with a treadle or knee-lifter of any suitable construction.

Mounted in the face-plate 20 is a cutterbar 21 to the lower end of which is secured a knife holder 22 to which is attached a knife or cutting blade 23 by means of a clamping plate'24, a set'screw 25 and pins 26 fixed to the said knife-holder and passing through a slot or holes in the knife or cutting blade. The knife or cutting blade 23' is preferably a two-edged one, so that when one edge becomes dulled by use the said knife or cutting blade may be reversed to bring the other edge thereof. into cutting position. Moreover the said knife or cutting blade is preferably so disposed or mounted that the edge or edges thereof will be inclined relative to the work so as to enable the said cutting blade to operate with a shear cu The said knife or cutting blade is disposed above the work-plate of the machine, rearward of the stitch-forming devices, and transverse to the direction of the feed of the material, and registers with a slot 27formed, as shown in the present instance, in the throat-plate 28 of the machine. The said slot,- asherein shown, consists in forming the said throatplate in two sections, one of which is slightly separated from the other. To maintain the knife or cutting blade i working position in register with the slot in the throat-plate a bracket 29 'is rigidly attached, as by a set screw 30, to the cutterbar 2l, said bracket being forked at its inner end to em race the presser-bar 17 so as to prevent the cutter-bar from turning in its vertical hearings in the face-plate 20. The cutter-bar 21 is preferabl provided'at its u per end with a knob or liand piece 31 which may be struck or pressed upon by the attendant to depress the cutter-bar when,

desired, and interposed between the said knob or hand piece and the-face-plate 20 is a spiral spring 32 which will lift the said cutter-bar after each cutting operation.

Instead of depressing the cutterbar, for its cutting operations, by means of the knob or hand piece referred to, the said -cutterbar may be depressed by a lever 33 provided at its forward end with a projection 34 engaging a pin or projection 35 on the said cutter-bar, the said depressing lever 33 being connected at its rear end with a rod 36 extending down through the work-plate and adapted to be operated by a treadle device or knee operating device of any suitable or well-known construction. The means by which the knife or blade may thus be depressed by the attendant of the machine, to sever a stitched strip after the machine has been stopped, will be hereinafter referred to as manually operated means, in cont-radistinction to automatic or mechanically operated means which would depress the cutting blade at predetermined intervals while the machine is running, and the operation of which could not be controlled by the operative or attendant. Thus stitched strips of any desired length or of varying lengths may be formed by the use of applicants machine, as will be understood.

This improved cdtting-ofi device is more especially adapted for severing strips of fabric having in-folde'd edges and which strips of fabric are intended to be sewed to pieces or sections of garments, as to the bosoms of shirts, and in such instances the folded strips to be severed may constitute plaits. As illustrating a preferred embodi ment of the present invention the sewing machine to which the same is shown as being applied is equipped with upper and lower strip folding and guiding devices 37 and 38 arranged in front or forward of the stitch-forming devices. The upper folding and guiding device 37 is supported from the head of the machine by an arm or bracket 39, and the lower strip folding and guiding device 38 is mounted on a holder 40 having slotted arms 41 by means of which it may be attached to the work-plate 13 of the machine by set screws 42.

The folding and guiding devices herein shown are adapted to fold in the edges of two strips of fabric which will be presented to the stitch-forming devices one on top of the other, the upper folded strip being wider than the lower folded strip so that said upper strip will overlap said lower strip and thus, when secured to the garment section, will provide suitable plaits. In the construction shown the edges of the upper strip are folded in downward, while the -int0 the machine.

stitched together and to the garment section the edges of said strips will present a finished appearance. In stitching the folded or turned-in edges of the strips, to form the completed strip, a stitch-forming mechanism comprising two separated pairs 'of needles, as shown in Fig. 1, to form double rows of stitches at the edges of the completed strip, will preferably be employed.

In the operation ofthe machine herein shown and described, when a suitable length of strip has been sewed to a garment section, the machine will be stopped and the,

cutter bar will be depressed by the operative to sever the strip, and thus disconnect the garment section the stitching of which has just been completed from the following garment section which will have been entered From this it will be understood that the present improvement provides convenient means whereby a strip which has been stitched either to a garment section or otherwise may be quickly and conveniently severed at any desired point without removing the work from the machine. The inclined two edged cutting blade may be provided either with holes 43 registering with the pins 26 on the knife-holder 22, or said blade may be providedwith a slot 44 the ends of which may be engaged by said pins, to maintain the said cutting blade in place.

The invention is not to be understood as being limited to the details herein shown, as it is obvious that such details may be varied, within the limits of mechanical skill, without departing from the invention as defined by the claims hereunto appended.

Having thus described my invention 1 claim and desire to secure .by Letters Patent:

1. In a sewing machine, the combination with suitable stitch-forming devices, of a strip-severing device mounted above the work-plate of the machine and rearward of the said stitch-forming devices, and comprising a knife or blade disposed transverse to the direction of the feed of the work, so as to sever a strip'of fabric after it has been stitched, said strip-severing device including a vertically reciprocating cutter-bar mounted on the head or face-plate of the machine and provided at its upper end with a knob or hand piece by which it may be depressed for a cutting operation, when desired, and a spring encircling said bar for automatically lifting the same after it has been depresse 2. In a sewing machine, the combination with suitable stitch-forming devices, of a strip-severing device mounted above the work-plate of the machine and rearward of the said stitch-forming devices, and.comprising a knife or'blade disposed transverse to the direction of the feed of the work, so

i as to sever a strip of fabric after. it has been stitched, said strip-severing device including a vertically reciprocating cutter-bar mounted on the head or face-plate of the machine and provided at its up er end with a knob or hand-piece by which it may be depressed for a cutting operation, when desired, and a spring encircling said bar for automatically lifting the same after it has been depressed, said cutter-bar being provided with a rigid guiding bracket, and a bar slidably engaged by said bracket so that the latter will prevent the cutter-bar from turning, and will thereby maintain the cut ter in operative position.

3. In a sewing machine, the combination with suitable stitch-forming devices, of a strip-severing device mounted above the work-plate of the machine and rearward of the said stitch-forming devices, and comprising a knife or blade disposed transverse to the direction of the feed of the work, manually operated means for depressing said knife or blade to sever a strip of fabric after it has been stitched and the machine has been stopped, and means, disposed in front of the said stitch-forming devices, for guiding strips of fabric thereto, said means comprising upper and lower guiding folders adapted to turn in the edges of two superposed strips of fabric and direct the same to said stitch-forming devices.

4. In a sewing machine, the combination with suitable stitch-forming devices comprising two separated pairs of needles, of a strip-severing device mounted above the work-plate of the machine and rearward of the said stitch-forming devices, and comprising a knife or blade disposed transverse to the direction of the feed of the work, manually operated means for depressing said knife or blade, to sever a strip of fabric after it has been stitched and the machine has been stopped, and upper and lower guid ing folders dlsposed in front of said needles and adapted to turn in the edges of two superposed strips of fabric and direct the same to said stitch-forming devices; whereby the turned-in edges of said strips may be stitched together and to the garment by double rows of stitches, and whereby also the completed strip may be severed at intervals, as may be desired.

In testimony whereof I affix my signature, in presence of two witnesses.

JOHN HOLTZMANN.

Witnesses:

JAMES C. SPITLER, ROLAND H. HURST.

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