US2089551A - Sewing machine mechanism - Google Patents

Sewing machine mechanism Download PDF

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US2089551A
US2089551A US752441A US75244134A US2089551A US 2089551 A US2089551 A US 2089551A US 752441 A US752441 A US 752441A US 75244134 A US75244134 A US 75244134A US 2089551 A US2089551 A US 2089551A
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cam
work
shaft
movement
secured
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US752441A
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John F Hand
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De Long Hook & Eye Co
DE LONG HOOK AND EYE Co
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De Long Hook & Eye Co
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B3/00Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
    • D05B3/12Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing for fastening articles by sewing
    • D05B3/18Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing for fastening articles by sewing hooks or eyelets
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B73/00Casings
    • D05B73/04Lower casings
    • D05B73/12Slides; Needle plates

Definitions

  • the invention relates to sewing machine mechanism and involves various improvements for the purpose of adapting such mechanism for sewing r eyelet tape' or the like to strips or pieces of fabric.
  • the invention has for one of its principal objects the provision of a pocket for the eyelets, formed between the eyelet tape and the goods to which the tape is secured and having one side 10 thereof open in order to give access to the eyelets.
  • This object is accomplished by the provision of mechanism for stitching the eyelet tape to the goods lengthwise of the tape and in line with the eyelets, and deflecting the line of stitching inwardly from one edge of the tape around each of the eyelets as they are successively reached in the stitching operation.
  • the invention has for a further object the provision of improved mechanism for deflecting 20 the line of stitching around the eyelets during the process of securing the eyelet tape to a strip of fabric.
  • This object is accomplished by eniploying a reciprocating needle bar mounted for swinging movement transversely of the direction 25 of feed of the goods, and by providing improved mechanism for swinging the needle bar, the operation of which is initiated by means of a feeler device arranged to be actuated by engagement with the successive eyelets.
  • a further object of the invention is the provision of mechanism for varying the speed of the work feeding device during the formation of the eyelet pockets. This object is accomplished by the provision of speed varying mechanism the 35 operation of which isinitiated likewise by the engagement of a feeler device with the eyelets as the successive eyelets approach the stitch forming mechanism.
  • Another object of the invention is the provi- 40 sion of improved mechanism for transmitting power from the main drive shaft of the sewing machine to the actuating mechanism for the speed varying device and the needle-bar swinging device.
  • a still further object of the invention is the provision of improved mechanism for varying the speed of the work feeding device associated with the stitch forming mechanism of a sewing machine.
  • a further object of the invention is the provision of an improved feeler device for cooperation with the successive eyelets of eyelet tape in order to initiate the actuation of the speed N changing mechanism of the work feeding device and the actuation of the needle bar swinging mechanism as the successive eyelets approach the stitch forming mechanism.
  • a further object of the invention is the provision of an improved feeler or tripping device which is so constructed that it will operate by engagement with the eyelets and will not be operated by engagement with an increased thickness of the goods, such as a seam.
  • a still further object of the invention is the provision of an improved structure for feeding the work so as to enable the entire length of the strip of eyelet tape or the like and of the fabric to be stitched together.
  • This object is accomplished by the provision of a work feed structure wherein the work is advanced past the stitch forming mechanism by means of a carrier tape acting in cooperation with a pair of feed rolls positioned in the rear of the stitch forming mechanism.
  • Fig. l is a perspective view of a sewing machine mechanism with the present improvements incorporated therein;
  • Fig. 2 is a front elevational view thereof, with parts omitted or broken away;
  • Fig. 3 is an elevational view of the end of the machine with which the stitch forming mechanism is associated;
  • Fig. 4 is a horizontal, longitudinal, sectional view of the machine taken on the line 6-4 of Fig. 2;
  • Fig. 5 is a longitudinal, sectional view taken on the line 55 of Fig. 4;
  • Fig. 6 is a vertical, sectional view taken on the line 6-6 of Fig. 2;
  • Fig. 7 is a vertical, sectional view taken on the line i-l of Fig. 5; t
  • Fig. 8 is an enlarged, sectional view taken on the line 8-8 of Fig. 4, and showing details of the transmission mechanism between the main drive shaft and the cam shaft for controlling the speed of the work feeding device and the swinging action of the needle bar;
  • Fig. 9 is a view similar to Fig. 8, showing the parts in a diflerent position
  • Fig. 10 is a plan view, partly in section, of the transmission mechanism shown in Fig. 8;
  • Fig. 11 is a sectional view taken on the line 40 in a swinging arm
  • Fig. 13 is a transverse, sectional view taken on the line l3-l3 of Fig. 4, and showing one position of the adjustable eccentric forming part of the work feeding mechanism;
  • Fig. 14 is a view similar to Fig. 13 showing another position of the adjustable eccentric
  • Fig. 15 is a detailed, elevational view showing the contour of the cam employed for swinging the needle bar:
  • Fig. 16 is a detailed, elevational view showing the contour of the cam employed for controlling the speed of the work feeding mechanism
  • Fig. 1'! is an enlarged, transverse, sectional view taken on the line i1i1 of Fig. 4;
  • Fig. 18 is a transverse, sectional view taken on the line ll-IB of Fig. 1'7;
  • Fig. 19 is a transverse, sectional view taken on the line i8-l3 of Fig. 17;
  • Fig. 20 is an enlarged, plan view showing a section-of a strip of eyelet tape stitched to a strip oi fabric by the improved mechanism disclosed herein;
  • Fig. 21 is a transverse, sectional view of the same.
  • Fig. 22 is a transverse, sectional view similar to Fig. 21 but showing the strip of fabric folded upon and stitched to itself and to the eyelet tape in position to be attached to a piece of fabric material.
  • the needle bar 4 is mounted to reciprocate longitudinally in guideways 6 formed 1 pivoted at its upper end to the head 3, as shown at 8, and provided with a pin and slot structure 9 near the lower end thereof for guiding the arm in its swinging movement with respect to the head.
  • the main drive shaft it extends through the horizontal portion of the bracket'arm 2 and is mounted for rotation in suitable bearings in the bracket arm.
  • the drive shaft it is rotated by means of a belt ll passing over a pulley I2 50 secured on the outwardly projecting end of the shaft, the belt being driven from any suitable source of power, such as an electric motor.
  • the end of the drive shaft adjacent the head 3 of the bracket arm may be provided with any well known means, such as a pitman structure l3, for imparting reciprocatory movement to the needle bar 6.
  • a shaft i5 Extending longitudinally beneath the bed plate 1 and supported in suitable bearings I4 on the 60 bed plate is a shaft i5 having a pulley i6 secured on one end thereof and driven by a belt l1 passing around a pulley l8 secured on the main drive shaft.
  • the opposite end of the shaft l5 terminates beneath the head 3 and is provided with 65 a bevel gear l8 which meshes with a bevel gear 20 secured on a stub shaft 2
  • a rotary hook or looping device 23 of usual structure for cooperation with the needle 5 to provide stitch 75 25 having a feed roll 26 secured thereon in cooperative relation to a pressure roll 21 supported above the feed roll for movement toward and away from the latter.
  • the pressure roll 21 is supported in a bracket 28 carried upon the lower end of a rod 23 supported for vertical movement in a bracket 30 mounted upon the head 3 and extending rearwardly thereof.
  • the rod 29 is pressed downwardly by means of a coiled spring 3i surrounding the same and having the lower end in engagement with a collar 32 secured to the rod and the upper end in engagement with the lower end of a hollow adjusting screw 83 through which the rod extends.
  • a manipulating handle 34 of well known form may be pivoted to the supporting bracket 30 for lifting the pressure roll 21 out of engagement with the feed roll 26.
  • this handle being provided with a flattened portion 35 for engagement beneath a projection 36 on the collar 32 in order to hold the pressure roll in its raised position.
  • the extended end of the feed shaft 25 may be provided with a milled knob 31 for manual rotation of the shaft at any time desired.
  • the feed shaft is preferably provided with a brake structure 38 having a manually adjustable braking action and operating continuously in order that the step-by-step rotation of the shaft may be properly controlled. Step-by-step motion is imparted to the feed shaft by means of a ratchet wheel 39 secured thereon for cooperation with a pawl 46.
  • the pawl 50 is pivoted to the outer end of the arm 4! of a twoarmed lever 42 loosely mounted on the feed shaft 25, and this arm has secured thereto a flat spring 43 a portionof which engages with the pawl for the purpose of keeping the pawl in contact with the ratchet wheel 39.
  • a link 45 extends to the free end of a crank arm 46 adjustably secured on a rock shaft 41 extending longitudinally beneath the bed plate I and suitably supported in bearings 48 projecting therefrom.
  • the rock shaft 41 receives its rocking movement through a crank arm 49 adjustably secured thereon and having its free end pivotally connected to the lower end of an eccentric rod 50 the upper end of which is provided with an eccentric strap 5
  • the eccentric 52 has an enlarged opening 53 therethrough for receiving the shaft I0,
  • the car 54 is pivoted upon the adjacent face of the pulley l8 by means of a screw 56 passing freely through the ear and threaded into an opening in the pulley.
  • the ear 55 is provided with anelongated slot 51 for loosely receiving a screw 58 which is threaded in a suitable opening in the adjacent face of the pulley l8.
  • This pin and slot arrangement serves as a guide for the ear 55 thereby permitting the eccentric to swing upon the screw 56 into different positions of eccentricity with respect to shaft I0.
  • Hollow projection 59 is threaded for the reception of a screw 6
  • drain I! having its inner end in engagement with the drive shaft II is slidably mounted in the hollow projection 60, and is 5 pressed inwardly and retained in contact with the drive shaft by meme! a coiled spring 88 the tension of which may be adjusted by means of a screw 81 threaded in the outer end of the projection 68.
  • the eccentric t2 is'automatically adjusted into different positions of eccentricity with aspect to the drive shaft It by means of a bolt 8 extending into the bore 36 in the end of the drive shaft and having its inner end as tapered for col5 operation with the inner end of the pin 82.
  • a bolt 8 extending into the bore 36 in the end of the drive shaft and having its inner end as tapered for col5 operation with the inner end of the pin 82.
  • the outer end of the eccentric adjusting bolt 59 is, threaded in a frame "it which is mounted for reciprocating movement in a guideway ii secured bid the rear of the bracket arm 2.
  • the inner end of the frame I0 is provided with an offset portion ll? having a cam roller 73 thereon for cooperation with a cam it for varying the feed of the work and hereinafter referred to as the feed cam.
  • the roller It is k p in ngagement withthe feed cam by means 40 of a coiled spring It one end of which is secured to a pin it fixed to the frame it and the opposite end of which is secured to a pin l'l fixed to the guideway ii.
  • the feed cam It is secured on the rear end of a cam shaft it extending from front to rear through the bracket arm 2- and provided with a milled knob id for ef'fectingmanual adjustment 7 thereof and of the cams carried thereby.
  • a milled knob id for ef'fectingmanual adjustment 7 thereof and of the cams carried thereby.
  • a cam 8B for swinging the needle bar d and hereinafter referred to as the needle cam, is secured on the cam shaft it in front of the bracket arm 2.
  • the needle cam so cooperates with a cam roller 8! on the end of a cam rod 62 having a slot 88 therein for engagement with the cam shaft I8 to guide the cam rod in its reciprocating movement.
  • roller ai is kept in engagement with the needle so cam 89 by means of a coiledcpring as one end of which is secured to a pin 85 fixed to cam rod 82 and the opposite end of which is fixed to a pin es suitably supported upon the bracket arm 2.
  • is pivoted to the lower end of the swinging arm I upon which the needle bar 4 is mounted. It will be apparent, therefore, that rotation of needle cam 80 will operate to swing the arm I about its pivot B and thereby oscillate or swing the needle 5 transversely of the direction in which the needle reciprocates during the stitch forming operation.
  • both the feed cam 1.4 and the needle cam are stationary when the machine is operating to form a straight line of stitches in the direction of feed of the goods.
  • a novel form of mechanism has been provided for rotating the cam shaft 18 step by step, this operation being initiated by engagement of the eyelets with a part of the mechanism.
  • a ratchet wheel 87 is secured on the cam shaft I8 beneath the drive shaft Ill, and a pawl 88 having its free end arranged for cooperation with the teeth of the ratchet'wheel 8'! has its opposite end pivoted to the arm 89 of a twoarmed lever 90 loosely supported on the cam shaft 18.
  • having one end secured to a pin 92 fixed to the pawl 88 and the opposite end secured to the two-armed lever 90 serves to pull the free end of the pawl 88 toward the ratchet wheel.
  • the other arm 98 of thelever at projects upwardly and is provided with a cam roller 9 which engages with a cam slot formed in a cam cylinder 96 secured on the drive shaft I t and rotating continuously therewith.
  • the pawl 88 is normally retained in inoperative relation with respect to the ratchet wheel ill by means of a' detent 91 pivoted on the ratchet wheel as shown at 88.
  • a coiled spring 99 having one end secured to the detent 97 and its opposite end secured to a pin I00 fixed to the ratchet wheel 81 operates to move the edge IIlI of the detent into the position shown in Fig. 8 wherein the pawl 83 slides back and forth upon the edge It! and therefore does not-operate to rotate cam shaft I8 during its reciprocating movement.
  • lug I02 is provided on the upper end of a trip rod I 03 having a longitudinal slot I84 therein for engagement about cam shaft 16 to guide the rod in its verti cal movements.
  • the lug IE2 is arranged to engage with a pin I05 projecting outwardly from one face of the detent 91 as will be clear from Figs. 6 and 11.
  • the lower end of trip rod I93 is,
  • trip lever I06 pivoted to one end of a trip lever I06 the opposite end of which is adjustably secured on a rock shaft llli by means of a set-screw I08.
  • the trip rod I03 together with the trip lever "18,18 held in its uppermost position by means of a coiled spring I09 having its lower end secured to the trip lever and its upper end secured to a fixed pin H0. Movement of the trip lever I05 upwardly is limited by means of an adjustable screw III threaded through the'free end of a bracket H2 secured to the bed plate I.
  • the rock shaft IIlI is mounted transversely of the bed plate I alongside the stitch forming mechanism and'is supported in suitable bearings H3 secured to and projecting upwardly from the bed plate.
  • a feeler arm H8 Adjustably secured on the rock shaft I01, as by a set screw I I4 and. milled nuts H5 threaded on the rock shaft, is a feeler arm H8 the outer end of which is so positioned as to constitute a feeler III for engagement by eyelets or the like as they approach the stitch forming mechanism during the operation of the machine.
  • the arm H6 is so constructed that the feeler may be adjusted to and from the rock shaft I01 as shown at H8.
  • the feeler H1 is spring pressed toward the work by means of a tensioning member comprising a lever arm I I 9 adjustably secured to the rock shaft I01 by a set screw I20 and projecting from the rock shaft in a direction opposite to the feeler arm H6.
  • the free end of the lever arm H9 is provided with a boss 'I2I having a vertical opening therethrough within which the upper end of a pin I22 is slidably received.
  • a coiled spring I23 surrounds the pin I22 between the boss I2I and the head of the pin.
  • the feeler II1 is so arranged as to project downwardly into a slot formed by the opposing edges of a retainer plate I24 and a movable guide bar I25, as illustrated in Figs; 1, 4, 5 and 19.
  • the retainer plate I24 has one edge thereof projecting outwardly beyond a spacer member I20 to which the opposite edge of the plate is secured.
  • the inner edge of the movable guide bar I215 is cut away to provide a shoulder I21 which forms a guide for one edge of the eyelet tape T, and to provide an overhanging portion I28 for retaining the eyelet tape T in position as it moves inwardly with the material M toward the stitch forming mechanism.
  • the spacer I 28 forms a guide for the opposite edge of the, eyelet tape and the adjacent edge of the material to which the tape is being secured.
  • the guide bar I is provided with a pair of spaced ears I29 one of which is secured to the free end of an arm I30 pivoted to a bearing member I3I secured to and extending upwardly from the retainer plate I24, the other being secured to one end of a lever I32 pivoted to a bearing member I33 projecting upwardly from the retainer plate.
  • the opposite end of lever I32 is bent into a position outwardly of the forward edge of the bed plate I, and by means of a chain I34 or the like may be connected 'to a pedal so that the guide bar may be lifted out of contact with the work.
  • a spring I35 with one end secured to the bed plate I may be so bent as to have its opposite end engage with the lever I32 for the purpose of holding the guide bar I25 in contact with the work.
  • the bed plate I is cut away adjacent the stitch forming mechanism, and the opening thus formed is provided with an insert I36 having an elongated slot I31 therein to receive the needle 5 and permit the same to swing later-ally for the purpose of stitching around the eyelets U.
  • needle slot I31 registers with a similar slot in a wear plate I38 secured to the upper face of the bedplate.
  • the insert I36 and the wear plate I38 are also provided with registering slots slightly in advance of the needle slot in order to form an outlet I38 for a carrier tape W utilized in feeding, the work in the present mechanism.
  • carrier tape W passes rearwardly from the front edge of the bed plate I through a. channel I formed on the upper face of the bed plate and covered by the wear plate I38.
  • the carrier tape W emerges from the opening I33 it comes into engagement with the fabric material M to which the eyelet tape T is being secured, and after being secured together by the stitch forming mechanism the eyelet tape, the fabric material and the carrier tape are advanced as a unit by the work feed device heretofore described.
  • the work feed device is conveniently arranged at the rear of the bed plate I, in line with the stitch forming mechanism.
  • a carrier tape in the manner disclosed herein provides a simple means for feeding the goods through the machine and is particularly useful in providing a feed for the initial portion of the goods as they approach the stitch forming mechanism and move from the stitch forming mechanism to the feed device.
  • Such a carrier tape is also advantageous by reason of the fact that the goods or pieces of material to which the eyelet tape is secured are usually of limited length so that the carrier tape provides a means whereby the goods may be continuously fed past the stitch forming mechanism notwithstanding the short lengths of material which are utilized.
  • the parts thereof are so designed and are so timed with respect to each other as to form a line of stitching S lengthwise of the eyelet tape T, with three tie-stitches a, b, 0 connecting the line of stitching S with the stitches d, e, j, g, h, i deflected around the eyelets U and connected, in turn, to the line of stitching S by the three tie-stitches 1, k, I.
  • the needle cam 00 is so designed as to provide operating portions a to l as shown in Fig. 15 of the drawings, these portions corresponding respectively to stitches a to 1 shown in Fig. 20.
  • the needle cam 88 is illustrated in Figs. 1, 2 and 15 of the drawings in a position in which the cam roller 8i occupies a low point thereon, and the needle bar 4 is thus in a position wherein it reciprocates vertically without being subjected to a simultaneous swinging movement.
  • an eyelet U comes into engagement with the feeler II1 of the trip mechanism to thereby move the detent 91 into a position wherein the pawl 88 may cooperate with the teeth of the ratchet wheel 81
  • the cam shaft 18 is rotated step by step through a complete cycle of its operation by reason of the continuous reciprocatory movement of the pawl 88.
  • the ratchet wheel 01 is provided with twelve teeth, the number thus employed to complete its operative cycle corresponding with the number of stitches employed in stitching around each eyelet, and with the number of portions into which the operating face of the needle cam is divided.
  • rides inwardly on the inclined portion 1)" during which time the tie-stitch b is formed.
  • cam roller 8I rides upwardly on the insucceeding movement of cam 80 cam roller 8
  • In the next succeeding movement of cam 80 cam roller 8
  • rides inwardly along the inclined portion h thereby permitting the needle bar to'swing to the left and produce the stitch h.
  • cam Bil cam roller 8! rides still further inwardly on the portion i to produce the stitch i.
  • rides inwardly along the abruptly inclined portion 9" to produce the tie-stitch i.
  • cam 88 cam roller 8i rides upwardly upon the inclined portion is to again move the needle bar to the right and produce the tie-stitch is.
  • cam roller rides inwardly along the inclined portion 1' to produce the tie-stitch Z connecting with the line of stitching S and completing one cycle of operation of the needle cam.
  • the surface of the feed cam it is likewise designed to provide portions a" to l" corresponding respectively to the stitches a to Z and to the portions 11' to Z oi'the needle cam 80.
  • the feed cam M is in a position in 40 which the adjusting bolt 65 is in its extreme inward position to thereby provide maximum eccentricity of the eccentric 52 as shown in Fig. 13.
  • the feed cam when the feed cam is in this position the feed device will operate in a 45 normal way to move the goods past the stitch forming mechanism at a uniform. rate.
  • cam roller 13 rides upwardly on the inclined portion d" thereby adjusting the eccen- 65 tric 52 into a position to operate the feed device 7 tion as to continue the operation of the feed device and advance the goods during the formation oi the stitches e to i.
  • cam roller 13 traverses the low portions 9", is", Z" to thereby discontinue the operation of the feed device during the formation of the tie-stitches i, It, I.
  • the mechanism operates automatically to deflect the line 01' stitching around the successive eyelets as they reach the stitch forming mechanism.
  • the swinging movement of the needle bar and the variation in the feed of the work are controlled by the engagement of a part (if the trip mechanism with the particular eyelet adjacent the stitch forming mechanism, the tie stitches and the stitches deflected around the eyelets areproperly formed notwithstanding irregularities in the spacing of the eyelets.
  • the improvements have been disclosed herein in connection with mechanism adapted particularly for securing eyelet tape to strips of fabric and the like. It will be apparent, however, that the novel features are equally adaptable for deflecting a line of stitching around other forms of fastener elements such as hooks and eyes.
  • tie stitches and deflected stitches may be provided by suitably changing the contour oi the needle cam and the feed cam, by the provision of the required number of teeth upon the ratchet wheel Bl, and by properly timing these.
  • a sewing machine having feeding means for advancing the work in a given direction, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from the plane of movement of the work and for oscillatory movement transversely or the direction of reciprocatory movement, the combination of means for continuously reciprocating said bar, operating mechanism for simultaneously rendering said feeding means inoperative and oscillating said needle bar. and means in engagement with the work for initiating the actuation of said operating mechanism.
  • a sewing machine having feeding means for advancing the work in a given direction, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from the plane of movement of the work and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of means for continuously reciproil cating said bar, operating mechanism for controlling said feedingflmeans and for oscillating said needle bar, and yieldable means in engagement with the work for initiating the actuation the work for. initiating the actuation of said operating mechanism by engagement with the eyelets.
  • stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from the plane of movement of the work and for oscillatory movement transversely 45 of the direction of reciprocatory movement, the
  • a sewing machine having feeding means for advancing the work in a given direction, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from. the plane of movement of the work and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of a continuously rotating shaft for reciprocating said bar, a cam shaft, a cam on said cam shaft for oscillating said bar, a cam on said cam shaft for controlling said feeding means, transmission means between said shafts, and means in engagement with the work for rendering said transmission means operative.
  • a sewingmachine having a work support, feeding means for advancing the work across said support, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from said support and for oscillatory movement transversely of the I direction of reciprocatory movement, the combination of a continuously rotating shaft for reciprocating said bar, a cam shaft, a cam on said cam shaft for oscillating said bar, normally inoperative transmission means between said shafts, and trip mechanism associated with said work support and actuated by movement thereof relatively to said support for rendering said transmission means operative to drive said cam shaft.
  • a sewing machine having a work support, feeding means for advancing the work across said support, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from said support and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of a continuously rotating shaft for reciprocating said bar, a cam shaft, a cam on said cam shaft for varying the speed of said feeding means, normally inoperative transmission means between said slfafts, and trip mechanism associated with said work support and actuated by movement thereof relatively to said support for rendering said transmission means operative to drive said cam shaft.
  • a sewing machine having a work support, feeding means for advancing the work across said support, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from said work support and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of a continuously rotating shaft for reciprocating said bar, a cam shaft, a cam on said cam shaft for oscillating said bar, normally inoperative transmission means between said shafts and including a ratchet wheel on said cam shaft, a reciprocating pawl actuated by said continuously rotating shaft and a detent for holding said pawl out of engagement with said ratchet wheel, and trip mechanism associated with said work support and actuated by movement away from said support for rendering said detent inoperative.
  • a continuously rotating shaft an intermittently rotating cam shaft driven thereby, power transmitting means between said shafts including a ratchet wheel fixed on said cam shaft and a pawl actuated by said continuously rotating shaft and cooperating with said ratchet wheel to rotate said camshaft, a
  • a detent for holding said pawl out of engagement with said ratchet wheel, and means actuated by a variation in thickness of the work 60 for rendering said detent inoperative.
  • a sewing machine having feeding means for intermittently advancing the work in a given direction, and stitch forming mechanism including a needle bar .supported for longitudinal re- 5 ciprocatory movement toward and away from the work and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of means for continuously reciproeating said bar, and means for oscillating said 70 bar including a rotatable cam, a reciprocating member for rotating said cam, a detent for rendering 'said member inoperative to rotate said cam, and means contacting with said work and actuated by a variation in thickness of said work for renderingsaid detent inoperative.
  • trip mechanism for initiating the transverse oscillatory movement of the needle bar comprising a lever pivoted alongside said support, a feeler on said lever over said support, means for adjusting said feeler toward and away from said support, and resilient means regulated by the adjustment of said feeler for resisting movement of said feeler away from said support.
  • a sewing machine having a work support, feeding means for advancing the work across said support, and adjustable means for varying the rate of feed of the work, trip mechanism for initiating the operation of said adjustable means comprising a rock shaft mounted alongside said support, a feeler extending from said rock shaft over said support, adjustable means for resiliently resisting movement of said feeler away from said support, and adjustable means for limiting the movement of said feeler toward said support.
  • the combination with stitch forming mechanism and work feeding mechanism of work supporting and guiding means comprising a bed plate having thereon an enclosed guide channel for a carrier tape extending from the front end thereof to a point in. advance of the stitch forming mechanism, the inner end of said channel communicating with the upper face of said bed plate, a guide member fixed to said bed plate and extending from front to rear thereof adjacent one edge of said guide channel, a retainer plate projecting from said guide member over said guide channel and spaced from said bed plate, a movable guide bar on said bed plate adjacent the opposite edge of said guide channel, and a projection extending from said movable guide member over said guideway.
  • the combination with stitch forming mechanism of work supporting and feeding mechanism including a bed plate having thereon a covered guide channel for a carrier tape extending from the front end thereof to a point in advance of the stitch forming mechanism, the inner end of said guide channel opening upwardly to the surface of said bed plate, a guide member for one edge of the fabric and the adjacent edge of the eyelet tape, a guide member for the opposite edge of the eyelet tape, and means in the rear of said stitch forming mechanism for engaging said carrier tape to feed the same and for engaging with and feeding the work.

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  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Description

Aug. 10,1937. HAND 2,089,551
SEWING MACHINE MECHANISM Filed Nov; 10, 1954 7 Sheets-Sheet 1 Ea b *5 IN V EN TOR.
B W i ATTORNEY.
Aug. 10,1937. J. F. HAND SEWING MACHINE MECHANISM Filed Nov. 10, 1954 7 Sheets-Sheet 2 INVENTOR.
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Aug. 10, 1937. \J. F. HAND SEWING MACHINE MECHANISM Filed NOV. 10, 1934 7 Sheets-Sheet 3 INVENTOR. rm Zfimd,
ATTO EY.
\Q M m 7 Sheets-Sheet 4 J. F. HAND SEWING MACHINE MECHANISM Filed Nov. 10, 1954 Aug. 10, 1937.
IN V EN TOR.
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EBIIIIIII! g a Aug.,10, 1937. HAND 2,089,551
' SEWING MQCHINE MECHANISM Filed Nov. 10, 1934 7 Sheets-Sheet 5 Aug. 10, 1937. J. F. HAND I SEWING MACHINE MECHANISM 7 Sheets-Sheet 6 Eiled Nov. 10, 1934 Aug. 10, 1937. J. F. HAND SEWING MACHINE MECHANISM Filed Nov. 10, 1934 7 Sheets-Sheet 7 INVENTOR Z Hand A TTORNE Y Patented Aug. 10, 1937 UNITED STATES PATENT OFFICE SEWING MACHINE MECHANIS M Application November 10,1934, Serial No. 752,441
. 22 Claims.
The invention relates to sewing machine mechanism and involves various improvements for the purpose of adapting such mechanism for sewing r eyelet tape' or the like to strips or pieces of fabric.
The invention has for one of its principal objects the provision of a pocket for the eyelets, formed between the eyelet tape and the goods to which the tape is secured and having one side 10 thereof open in order to give access to the eyelets. This object is accomplished by the provision of mechanism for stitching the eyelet tape to the goods lengthwise of the tape and in line with the eyelets, and deflecting the line of stitching inwardly from one edge of the tape around each of the eyelets as they are successively reached in the stitching operation.
The invention has for a further object the provision of improved mechanism for deflecting 20 the line of stitching around the eyelets during the process of securing the eyelet tape to a strip of fabric. This object is accomplished by eniploying a reciprocating needle bar mounted for swinging movement transversely of the direction 25 of feed of the goods, and by providing improved mechanism for swinging the needle bar, the operation of which is initiated by means of a feeler device arranged to be actuated by engagement with the successive eyelets. i
A further object of the invention is the provision of mechanism for varying the speed of the work feeding device during the formation of the eyelet pockets. This object is accomplished by the provision of speed varying mechanism the 35 operation of which isinitiated likewise by the engagement of a feeler device with the eyelets as the successive eyelets approach the stitch forming mechanism.
Another object of the invention is the provi- 40 sion of improved mechanism for transmitting power from the main drive shaft of the sewing machine to the actuating mechanism for the speed varying device and the needle-bar swinging device.
A still further object of the invention is the provision of improved mechanism for varying the speed of the work feeding device associated with the stitch forming mechanism of a sewing machine.
50 A further object of the invention is the provision of an improved feeler device for cooperation with the successive eyelets of eyelet tape in order to initiate the actuation of the speed N changing mechanism of the work feeding device and the actuation of the needle bar swinging mechanism as the successive eyelets approach the stitch forming mechanism.
A further object of the invention is the provision of an improved feeler or tripping device which is so constructed that it will operate by engagement with the eyelets and will not be operated by engagement with an increased thickness of the goods, such as a seam.
A still further object of the invention is the provision of an improved structure for feeding the work so as to enable the entire length of the strip of eyelet tape or the like and of the fabric to be stitched together. This object is accomplished by the provision of a work feed structure wherein the work is advanced past the stitch forming mechanism by means of a carrier tape acting in cooperation with a pair of feed rolls positioned in the rear of the stitch forming mechanism.
Still further objects and advantages of the various features of the invention will be apparent from the following description, taken with the accompanying drawings wherein:
Fig. l is a perspective view of a sewing machine mechanism with the present improvements incorporated therein;
Fig. 2 is a front elevational view thereof, with parts omitted or broken away;
Fig. 3 is an elevational view of the end of the machine with which the stitch forming mechanism is associated;
Fig. 4 is a horizontal, longitudinal, sectional view of the machine taken on the line 6-4 of Fig. 2;
Fig. 5 is a longitudinal, sectional view taken on the line 55 of Fig. 4;
Fig. 6 is a vertical, sectional view taken on the line 6-6 of Fig. 2;
Fig. 7 is a vertical, sectional view taken on the line i-l of Fig. 5; t
Fig. 8 is an enlarged, sectional view taken on the line 8-8 of Fig. 4, and showing details of the transmission mechanism between the main drive shaft and the cam shaft for controlling the speed of the work feeding device and the swinging action of the needle bar;
Fig. 9 is a view similar to Fig. 8, showing the parts in a diflerent position;
Fig. 10 is a plan view, partly in section, of the transmission mechanism shown in Fig. 8;
Fig. 11 is a sectional view taken on the line 40 in a swinging arm Fig. 13 is a transverse, sectional view taken on the line l3-l3 of Fig. 4, and showing one position of the adjustable eccentric forming part of the work feeding mechanism;
Fig. 14 is a view similar to Fig. 13 showing another position of the adjustable eccentric;
Fig. 15 is a detailed, elevational view showing the contour of the cam employed for swinging the needle bar:
Fig. 16 is a detailed, elevational view showing the contour of the cam employed for controlling the speed of the work feeding mechanism;
Fig. 1'! is an enlarged, transverse, sectional view taken on the line i1i1 of Fig. 4;
Fig. 18 is a transverse, sectional view taken on the line ll-IB of Fig. 1'7;
Fig. 19 is a transverse, sectional view taken on the line i8-l3 of Fig. 17;
Fig. 20 is an enlarged, plan view showing a section-of a strip of eyelet tape stitched to a strip oi fabric by the improved mechanism disclosed herein;
Fig. 21 is a transverse, sectional view of the same; and
Fig. 22 is a transverse, sectional view similar to Fig. 21 but showing the strip of fabric folded upon and stitched to itself and to the eyelet tape in position to be attached to a piece of fabric material.
e various features of the present invention, as i fiustrated in the drawings, are incorporated in a sewing machine having the usual bed plate I and bracket arm 2 supported thereon, the bracket arm having a head 3 on the free end thereof within which the reciprocating needle bar 4 is mounted, the needle 5 being secured within the lower end of the needle bar. In the machine disclosed herein, the needle bar 4 is mounted to reciprocate longitudinally in guideways 6 formed 1 pivoted at its upper end to the head 3, as shown at 8, and provided with a pin and slot structure 9 near the lower end thereof for guiding the arm in its swinging movement with respect to the head.
The main drive shaft it extends through the horizontal portion of the bracket'arm 2 and is mounted for rotation in suitable bearings in the bracket arm. The drive shaft it is rotated by means of a belt ll passing over a pulley I2 50 secured on the outwardly projecting end of the shaft, the belt being driven from any suitable source of power, such as an electric motor. The end of the drive shaft adjacent the head 3 of the bracket arm may be provided with any well known means, such as a pitman structure l3, for imparting reciprocatory movement to the needle bar 6.
Extending longitudinally beneath the bed plate 1 and supported in suitable bearings I4 on the 60 bed plate is a shaft i5 having a pulley i6 secured on one end thereof and driven by a belt l1 passing around a pulley l8 secured on the main drive shaft. The opposite end of the shaft l5 terminates beneath the head 3 and is provided with 65 a bevel gear l8 which meshes with a bevel gear 20 secured on a stub shaft 2| supported in a bearing member 22 on the bed plate. Secured on the free end of the stub shaft 2! is a rotary hook or looping device 23 of usual structure for cooperation with the needle 5 to provide stitch 75 25 having a feed roll 26 secured thereon in cooperative relation to a pressure roll 21 supported above the feed roll for movement toward and away from the latter. As illustrated herein, the pressure roll 21 is supported in a bracket 28 carried upon the lower end of a rod 23 supported for vertical movement in a bracket 30 mounted upon the head 3 and extending rearwardly thereof. The rod 29 is pressed downwardly by means of a coiled spring 3i surrounding the same and having the lower end in engagement with a collar 32 secured to the rod and the upper end in engagement with the lower end of a hollow adjusting screw 83 through which the rod extends. A manipulating handle 34 of well known form may be pivoted to the supporting bracket 30 for lifting the pressure roll 21 out of engagement with the feed roll 26. this handle being provided with a flattened portion 35 for engagement beneath a projection 36 on the collar 32 in order to hold the pressure roll in its raised position.
The extended end of the feed shaft 25 may be provided with a milled knob 31 for manual rotation of the shaft at any time desired. The feed shaft is preferably provided with a brake structure 38 having a manually adjustable braking action and operating continuously in order that the step-by-step rotation of the shaft may be properly controlled. Step-by-step motion is imparted to the feed shaft by means of a ratchet wheel 39 secured thereon for cooperation with a pawl 46.
As shown in Figs. 3, 4 and 6, the pawl 50 is pivoted to the outer end of the arm 4! of a twoarmed lever 42 loosely mounted on the feed shaft 25, and this arm has secured thereto a flat spring 43 a portionof which engages with the pawl for the purpose of keeping the pawl in contact with the ratchet wheel 39. From the free end of the other arm 44 of the two-armed lever 42 a link 45 extends to the free end of a crank arm 46 adjustably secured on a rock shaft 41 extending longitudinally beneath the bed plate I and suitably supported in bearings 48 projecting therefrom. The rock shaft 41 receives its rocking movement through a crank arm 49 adjustably secured thereon and having its free end pivotally connected to the lower end of an eccentric rod 50 the upper end of which is provided with an eccentric strap 5| surrounding an eccentric 52 adjustably secured to one face of the pulley l8 on the main drive shaft l0.
Referring to Figs. 4, 5, 13 and 14, it will be noted that the eccentric 52 has an enlarged opening 53 therethrough for receiving the shaft I0,
and is provided with an enlarged hub having a pair of diametrically arranged ears 54, 55 thereon. The car 54 is pivoted upon the adjacent face of the pulley l8 by means of a screw 56 passing freely through the ear and threaded into an opening in the pulley. The ear 55 is provided with anelongated slot 51 for loosely receiving a screw 58 which is threaded in a suitable opening in the adjacent face of the pulley l8. This pin and slot arrangement serves as a guide for the ear 55 thereby permitting the eccentric to swing upon the screw 56 into different positions of eccentricity with respect to shaft I0.
Arranged substantially at right angles to the cars 54, 55 and extending outwardly from the hub of the eccentric 52 is a pair of hollow projections 59, 60. Hollow projection 59 is threaded for the reception of a screw 6| having a pin 62 extending from the inner end thereof throughan opening 63 in the wall of the drive shaft I0 and communicating with a bore 64 extending inwardly from the end of the drive shaft ID as shown in Fig. 4. drain I! having its inner end in engagement with the drive shaft II is slidably mounted in the hollow projection 60, and is 5 pressed inwardly and retained in contact with the drive shaft by meme! a coiled spring 88 the tension of which may be adjusted by means of a screw 81 threaded in the outer end of the projection 68.
10 The eccentric t2 is'automatically adjusted into different positions of eccentricity with aspect to the drive shaft It by means of a bolt 8 extending into the bore 36 in the end of the drive shaft and having its inner end as tapered for col5 operation with the inner end of the pin 82. With such a structure it will be .fllmarent that movement of the bolt to lnwardlywithin the bore of the drive shaft will bring the tapered inner end thereof into engagement with the pin 62 and thus swing the eccentric against the tension of the spring Bt and about the screw 53 so that the eccentric may be adjusted into various positions to increase its eccentricity with respect to the drive shaft. It will also be apparent that when bolt 38 is moved outwardly in the bore as spring 66 will operate to shift the eccentric in the opposite direction to thereby decrease the eccentricity from maximum as shown in Fig. 13 to minimum or zero eccentricity as shown inFig. i i.
As shown in Figs. 4, 5 and 12, the outer end of the eccentric adjusting bolt 59 is, threaded in a frame "it which is mounted for reciprocating movement in a guideway ii secured bid the rear of the bracket arm 2. The inner end of the frame I0 is provided with an offset portion ll? having a cam roller 73 thereon for cooperation with a cam it for varying the feed of the work and hereinafter referred to as the feed cam. The roller It is k p in ngagement withthe feed cam by means 40 of a coiled spring It one end of which is secured to a pin it fixed to the frame it and the opposite end of which is secured to a pin l'l fixed to the guideway ii.
The feed cam It is secured on the rear end of a cam shaft it extending from front to rear through the bracket arm 2- and provided with a milled knob id for ef'fectingmanual adjustment 7 thereof and of the cams carried thereby. In order to control the rotation of the cam shaft Id, at
braking device it may be provided therefor in the rear of the bracket arm 2. A cam 8B for swinging the needle bar d, and hereinafter referred to as the needle cam, is secured on the cam shaft it in front of the bracket arm 2. The needle cam so cooperates with a cam roller 8! on the end of a cam rod 62 having a slot 88 therein for engagement with the cam shaft I8 to guide the cam rod in its reciprocating movement. Cam
roller ai is kept in engagement with the needle so cam 89 by means of a coiledcpring as one end of which is secured to a pin 85 fixed to cam rod 82 and the opposite end of which is fixed to a pin es suitably supported upon the bracket arm 2. The end of the cam rod 82 opposite the cam roller 8| is pivoted to the lower end of the swinging arm I upon which the needle bar 4 is mounted. It will be apparent, therefore, that rotation of needle cam 80 will operate to swing the arm I about its pivot B and thereby oscillate or swing the needle 5 transversely of the direction in which the needle reciprocates during the stitch forming operation.
In the form in which the invention is disclosed herein, both the feed cam 1.4 and the needle cam are stationary when the machine is operating to form a straight line of stitches in the direction of feed of the goods. In order to discontinue the operation of the feed mechanism or vary the rate of feed of the goods, and in order to provide a swinging movement of the needle bar 4 when an eyelet or the like approaches the needle 8, a novel form of mechanism has been provided for rotating the cam shaft 18 step by step, this operation being initiated by engagement of the eyelets with a part of the mechanism.
Referring to Figs. 5 6. 8, 9 and 10, it will be noted that a ratchet wheel 87 is secured on the cam shaft I8 beneath the drive shaft Ill, and a pawl 88 having its free end arranged for cooperation with the teeth of the ratchet'wheel 8'! has its opposite end pivoted to the arm 89 of a twoarmed lever 90 loosely supported on the cam shaft 18. A coiled spring 9| having one end secured to a pin 92 fixed to the pawl 88 and the opposite end secured to the two-armed lever 90 serves to pull the free end of the pawl 88 toward the ratchet wheel. The other arm 98 of thelever at projects upwardly and is provided with a cam roller 9 which engages with a cam slot formed in a cam cylinder 96 secured on the drive shaft I t and rotating continuously therewith.
Inasmuch as the pawl $8 is continuously reciprocated during the operation of the machine,
' means have been provided for keeping it out of engagement with the ratchet wheel at except at such times as the speed varying mechanism is to be actuated and the needle bar is to be oscillated transversely of the direction of its reciprocating movement. The pawl 88 is normally retained in inoperative relation with respect to the ratchet wheel ill by means of a' detent 91 pivoted on the ratchet wheel as shown at 88. A coiled spring 99 having one end secured to the detent 97 and its opposite end secured to a pin I00 fixed to the ratchet wheel 81 operates to move the edge IIlI of the detent into the position shown in Fig. 8 wherein the pawl 83 slides back and forth upon the edge It! and therefore does not-operate to rotate cam shaft I8 during its reciprocating movement.
In order that the detent 9? may be moved into a position to permit pawl 88 to engage with the teeth of the ratchet wheel 87, 9. lug I02 is provided on the upper end of a trip rod I 03 having a longitudinal slot I84 therein for engagement about cam shaft 16 to guide the rod in its verti cal movements. The lug IE2 is arranged to engage with a pin I05 projecting outwardly from one face of the detent 91 as will be clear from Figs. 6 and 11. The lower end of trip rod I93 is,
pivoted to one end of a trip lever I06 the opposite end of which is adjustably secured on a rock shaft llli by means of a set-screw I08. The trip rod I03, together with the trip lever "18,18 held in its uppermost position by means of a coiled spring I09 having its lower end secured to the trip lever and its upper end secured to a fixed pin H0. Movement of the trip lever I05 upwardly is limited by means of an adjustable screw III threaded through the'free end of a bracket H2 secured to the bed plate I.
The rock shaft IIlI is mounted transversely of the bed plate I alongside the stitch forming mechanism and'is supported in suitable bearings H3 secured to and projecting upwardly from the bed plate. Adjustably secured on the rock shaft I01, as by a set screw I I4 and. milled nuts H5 threaded on the rock shaft, is a feeler arm H8 the outer end of which is so positioned as to constitute a feeler III for engagement by eyelets or the like as they approach the stitch forming mechanism during the operation of the machine. Preferably, the arm H6 is so constructed that the feeler may be adjusted to and from the rock shaft I01 as shown at H8.
The feeler H1 is spring pressed toward the work by means of a tensioning member comprising a lever arm I I 9 adjustably secured to the rock shaft I01 by a set screw I20 and projecting from the rock shaft in a direction opposite to the feeler arm H6. The free end of the lever arm H9 is provided with a boss 'I2I having a vertical opening therethrough within which the upper end of a pin I22 is slidably received. A coiled spring I23 surrounds the pin I22 between the boss I2I and the head of the pin. It will be apparent that by loosening the set screw I20 the lever arm I I9 may be adjusted radially about the rock shaft I01 to thereby vary the tension in the coiled spring I23 and consequently vary the pressure of the feeler II1 upon the. goods. This structure provides a simple means for adjusting the position of the feeler with respect to the goods, so that the tripping device will be'operated by engagement of the feeler with the successive eyelets or the like and'will not be operated by its engagement with an unusual thickness of the fabric material, such as seams.
The feeler II1 is so arranged as to project downwardly into a slot formed by the opposing edges of a retainer plate I24 and a movable guide bar I25, as illustrated in Figs; 1, 4, 5 and 19. The retainer plate I24 has one edge thereof projecting outwardly beyond a spacer member I20 to which the opposite edge of the plate is secured. The inner edge of the movable guide bar I215 is cut away to provide a shoulder I21 which forms a guide for one edge of the eyelet tape T, and to provide an overhanging portion I28 for retaining the eyelet tape T in position as it moves inwardly with the material M toward the stitch forming mechanism. As shown in Figs. 18 and 19, the spacer I 28 forms a guide for the opposite edge of the, eyelet tape and the adjacent edge of the material to which the tape is being secured.
The guide bar I is provided with a pair of spaced ears I29 one of which is secured to the free end of an arm I30 pivoted to a bearing member I3I secured to and extending upwardly from the retainer plate I24, the other being secured to one end of a lever I32 pivoted to a bearing member I33 projecting upwardly from the retainer plate. The opposite end of lever I32 is bent into a position outwardly of the forward edge of the bed plate I, and by means of a chain I34 or the like may be connected 'to a pedal so that the guide bar may be lifted out of contact with the work. A spring I35 with one end secured to the bed plate I may be so bent as to have its opposite end engage with the lever I32 for the purpose of holding the guide bar I25 in contact with the work.
Referring to Figs. 3, 5 and 1'7, it will be noted that the bed plate I is cut away adjacent the stitch forming mechanism, and the opening thus formed is provided with an insert I36 having an elongated slot I31 therein to receive the needle 5 and permit the same to swing later-ally for the purpose of stitching around the eyelets U. The
needle slot I31 registers with a similar slot in a wear plate I38 secured to the upper face of the bedplate. The insert I36 and the wear plate I38 are also provided with registering slots slightly in advance of the needle slot in order to form an outlet I38 for a carrier tape W utilized in feeding, the work in the present mechanism. The
carrier tape W passes rearwardly from the front edge of the bed plate I through a. channel I formed on the upper face of the bed plate and covered by the wear plate I38. When the carrier tape W emerges from the opening I33 it comes into engagement with the fabric material M to which the eyelet tape T is being secured, and after being secured together by the stitch forming mechanism the eyelet tape, the fabric material and the carrier tape are advanced as a unit by the work feed device heretofore described.
In machines of this general character the work feed device is conveniently arranged at the rear of the bed plate I, in line with the stitch forming mechanism. The use of a carrier tape in the manner disclosed herein provides a simple means for feeding the goods through the machine and is particularly useful in providing a feed for the initial portion of the goods as they approach the stitch forming mechanism and move from the stitch forming mechanism to the feed device. Such a carrier tape is also advantageous by reason of the fact that the goods or pieces of material to which the eyelet tape is secured are usually of limited length so that the carrier tape provides a means whereby the goods may be continuously fed past the stitch forming mechanism notwithstanding the short lengths of material which are utilized.
As the invention is illustrated herein, the parts thereof are so designed and are so timed with respect to each other as to form a line of stitching S lengthwise of the eyelet tape T, with three tie-stitches a, b, 0 connecting the line of stitching S with the stitches d, e, j, g, h, i deflected around the eyelets U and connected, in turn, to the line of stitching S by the three tie-stitches 1, k, I. In order to form this series of stitches the needle cam 00 is so designed as to provide operating portions a to l as shown in Fig. 15 of the drawings, these portions corresponding respectively to stitches a to 1 shown in Fig. 20.
The needle cam 88 is illustrated in Figs. 1, 2 and 15 of the drawings in a position in which the cam roller 8i occupies a low point thereon, and the needle bar 4 is thus in a position wherein it reciprocates vertically without being subjected to a simultaneous swinging movement. When an eyelet U comes into engagement with the feeler II1 of the trip mechanism to thereby move the detent 91 into a position wherein the pawl 88 may cooperate with the teeth of the ratchet wheel 81, the cam shaft 18 is rotated step by step through a complete cycle of its operation by reason of the continuous reciprocatory movement of the pawl 88. It will be noted that the ratchet wheel 01 is provided with twelve teeth, the number thus employed to complete its operative cycle corresponding with the number of stitches employed in stitching around each eyelet, and with the number of portions into which the operating face of the needle cam is divided.
The first movement of the nedle cam 80 from the position shown in Fig. 15, and in the direction of the arrow shown therein, operates to move the cam roller 8I up the inclined portion a. to thereby swing the needle bar to the right (referring to Fig. 2) to produce the tie-stitch 0.. During the next movement of the cam 80 the cam roller 8| rides inwardly on the inclined portion 1)" during which time the tie-stitch b is formed. During the next movement of the cam 80 the cam roller 8I rides upwardly on the insucceeding movement of cam 80 cam roller 8| rides upwardly along the inclined face d, thereby swinging the needle bar still further to the right to produce the stitch d. In the next succeeding movement of cam 80 cam roller 8| continues upwardly on the inclined face e and the needle bar is swung still further to the right to produce the stitch e. During the next two succeeding movements of cam 80 cam roller 8| traverses the portions 1, g of cam 86 and, inasmuch as these portions are arranged to eflect no cam action, the two stitches f, a will be formed parallel to the line of stitching 8. During the next movement of cam 8d cam roller 8| rides inwardly along the inclined portion h thereby permitting the needle bar to'swing to the left and produce the stitch h. In the next movement of cam Bil cam roller 8! rides still further inwardly on the portion i to produce the stitch i. In the next succeeding movement of cam 89 cam roller 8| rides inwardly along the abruptly inclined portion 9" to produce the tie-stitch i. In the next movement oi cam 88 cam roller 8i rides upwardly upon the inclined portion is to again move the needle bar to the right and produce the tie-stitch is. In the final movement of the cam the cam roller rides inwardly along the inclined portion 1' to produce the tie-stitch Z connecting with the line of stitching S and completing one cycle of operation of the needle cam.
In order that the feed of the work may be controlled to enable the various stitches to be formed, the surface of the feed cam it is likewise designed to provide portions a" to l" corresponding respectively to the stitches a to Z and to the portions 11' to Z oi'the needle cam 80. As illustrated in Figs. 4, 12 and 16 of the drawings, the feed cam M is in a position in 40 which the adjusting bolt 65 is in its extreme inward position to thereby provide maximum eccentricity of the eccentric 52 as shown in Fig. 13. As will be apparent, whenthe feed cam is in this position the feed device will operate in a 45 normal way to move the goods past the stitch forming mechanism at a uniform. rate.
When an eyelet is advanced into engagement with the feeler i ii to thereby operate the tripping mechanism and initiate the rotation of the 59 cam shaft is, the first movement of the feed cam 15 in the direction oi? the arrow as shown in Fig. 16 permits the cam roller E3 to ride down along the inclined portion a" and this movement of the cam roller '73 permits the eccentric ad- 55 justing bolt 58 to move outwardly under the influence of coiled spring 15 to thereby adjust the eccentric 52 into the position shown in Fig. 14, and thereby discontinue the feed of the work. During the next two consecutive movements of 60 cam 'i-i cam roller '33 traverses the portions b" and c" of cam it, during which time the feed device remains inoperative. In the next movement of cam is cam roller 13 rides upwardly on the inclined portion d" thereby adjusting the eccen- 65 tric 52 into a position to operate the feed device 7 tion as to continue the operation of the feed device and advance the goods during the formation oi the stitches e to i. In the next three succeeding movements of cam it cam roller 13 traverses the low portions 9", is", Z" to thereby discontinue the operation of the feed device during the formation of the tie-stitches i, It, I. This completes the cycle or operation or the feed cam 14 and returns the cam roller 73 to the position shown in Fig. 16 wherein normal operation of the feed device takes place for the continued formation of the line of stitching 8 until the trip mechanism is again actuated by an eyelet U to initiate the rotation of the cam shaft 10.
with the improvements disclosed herein, it will be apparent that the mechanism operates automatically to deflect the line 01' stitching around the successive eyelets as they reach the stitch forming mechanism. Inasmuch as the swinging movement of the needle bar and the variation in the feed of the work are controlled by the engagement of a part (if the trip mechanism with the particular eyelet adjacent the stitch forming mechanism, the tie stitches and the stitches deflected around the eyelets areproperly formed notwithstanding irregularities in the spacing of the eyelets. The improvements have been disclosed herein in connection with mechanism adapted particularly for securing eyelet tape to strips of fabric and the like. It will be apparent, however, that the novel features are equally adaptable for deflecting a line of stitching around other forms of fastener elements such as hooks and eyes.
It will also be apparent that the invention may be employed in securing fastener tape to a strip of fabric without the formation of pockets of the precise type illustrated in Figs. 20, 21 and 22. It will likewise be understood that the improved mechanism disclosed herein may be readily adapted to stitch around eyelets or the like without employing the precise form of stitches which have been disclosed. With the form and arrangement of the various elements illustrated herein, it will be readily apparent to those skilled in the art that other forms and arrangements.
of the tie stitches and deflected stitches may be provided by suitably changing the contour oi the needle cam and the feed cam, by the provision of the required number of teeth upon the ratchet wheel Bl, and by properly timing these.
and other elements of the mechanism. It will also be apparent that various features of the improvements are readily adaptable for use in combinations and arrangements other than those specifically shown and described herein, and that various changes may be made in the novel combinations, as well as in the elements of the combinations, without departing from the invention which has been made.
The particular features which are believed to be'novel and which are intended to be protected by Letters Patent are set out in the following claims:
1. In a sewing machine having feeding means for advancing the work in a given direction, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from the plane of movement of the work and for oscillatory movement transversely or the direction of reciprocatory movement, the combination of means for continuously reciprocating said bar, operating mechanism for simultaneously rendering said feeding means inoperative and oscillating said needle bar. and means in engagement with the work for initiating the actuation of said operating mechanism.
2.-In a sewing machine having feeding means for advancing the work in a given direction, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from the plane of movement of the work and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of means for continuously reciproil cating said bar, operating mechanism for controlling said feedingflmeans and for oscillating said needle bar, and yieldable means in engagement with the work for initiating the actuation the work for. initiating the actuation of said operating mechanism by engagement with the eyelets.
4. In a machine for sewing eyelet tape or the like to a strip of fabric and having feeding means for advancing said tape and said strip, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from the work and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of means for continuously reciprocating said bar, operating mechanism for controlling said feeding means and for oscillating said bar, and trip means in yielding engagement with the work for'initiating the actuation of said operating mechanism by engagement with the eyelets.
5. In a sewing machine having feeding means 40 for advancing the work in a given direction, and
stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from the plane of movement of the work and for oscillatory movement transversely 45 of the direction of reciprocatory movement, the
combination of means for continuously reciprocating said bar, operating mechanism for controlling said feedingmeans and for gradually effecting asingle oscillation of said bar simultaneouslywith 50 aplurality of reciprocatory movements: thereof,
and means in engagement with the work for initiating the actuation of said operating mechanism.
6. In a sewing machine having feeding means 55 for advancing the work in a given direction, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from the plane of movement of the work and for oscillatory movement transversely of the direction of reciprocatory movement, the
combination of means for continuously reciprocating said bar, operating mechanism for simultaneously varying the speed of said feeding means and oscillating said needle bar, and means in yielding engagement with the work for initiating the actuation of said operating mechanism. 7. In a sewing machine having feeding means for advancing the work in a given direction, and stitch forming mechanism including a needle bar 7 -supported for reciprocatory movement toward and away from the plane of movement of the work and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of means for continuously reciproca- 75 ting said bar, operating mechanism for simultaneously varying the speed of said feeding means and oscillating said needle bar including a cam shaft, a cam on said shaft for oscillating said bar and a cam on said shaft for actuating the speed varying means, and means in yielding engagement with the work for initiating the actuation of said operating mechanism.
8. In a sewing machine having feeding means for advancing the work in a given direction, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from. the plane of movement of the work and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of a continuously rotating shaft for reciprocating said bar, a cam shaft, a cam on said cam shaft for oscillating said bar, a cam on said cam shaft for controlling said feeding means, transmission means between said shafts, and means in engagement with the work for rendering said transmission means operative.
9. In a sewingmachine having a work support, feeding means for advancing the work across said support, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from said support and for oscillatory movement transversely of the I direction of reciprocatory movement, the combination of a continuously rotating shaft for reciprocating said bar, a cam shaft, a cam on said cam shaft for oscillating said bar, normally inoperative transmission means between said shafts, and trip mechanism associated with said work support and actuated by movement thereof relatively to said support for rendering said transmission means operative to drive said cam shaft.
10. In a sewing machine having a work support, feeding means for advancing the work across said support, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from said support and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of a continuously rotating shaft for reciprocating said bar, a cam shaft, a cam on said cam shaft for varying the speed of said feeding means, normally inoperative transmission means between said slfafts, and trip mechanism associated with said work support and actuated by movement thereof relatively to said support for rendering said transmission means operative to drive said cam shaft.
11. In a sewing machine having a work support, feeding means for advancing the work across said support, and stitch forming mechanism including a needle bar supported for reciprocatory movement toward and away from said work support and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of a continuously rotating shaft for reciprocating said bar, a cam shaft, a cam on said cam shaft for oscillating said bar, normally inoperative transmission means between said shafts and including a ratchet wheel on said cam shaft, a reciprocating pawl actuated by said continuously rotating shaft and a detent for holding said pawl out of engagement with said ratchet wheel, and trip mechanism associated with said work support and actuated by movement away from said support for rendering said detent inoperative.
12. In a sewing machine, a continuously rotating shaft, an intermittently rotating cam shaft driven thereby, power transmitting means between said shafts including a ratchet wheel fixed on said cam shaft and a pawl actuated by said continuously rotating shaft and cooperating with said ratchet wheel to rotate said camshaft, a
5 detent on said ratchet wheel for normally holding said pawl out of engagement therewith, and trip mechanism actuated by a variation in thickness of the work for rendering said detent inoperative.
i 13. In a sewing machine having feeding means for advancing the work, and stitch forming mechanism including a reciprocating needle bar, the combination of a continuously rotating shaft for reciprocating said bar and actuating said 15 feeding means, a cam shaft driven thereby, a-
speed varying device between said continuously rotating shaft and said feeding means, a cam on said cam shaft for automatically controlling said speed varying device, transmission means between said shafts, and means actuated by a variation in thickness of the work for rendering said transmission means operative.
14. In apparatus for advancing the work to sewing machine stitch forming mechanism, the combination of an intermittently operated'feed roll, a continuously rotating shaft, an eccentric radially adjustable on said shaft, a cam for effecting adjustment of said eccentric, normally inoperative transmission means for driving said cam from said shaft, connecting means between said eccentric and said feed roll for intermittently' operating said feed roll, and means actuated by avariation in the thickness of said work for rendering said transmission means operative.
15. In work feeding mechanism for a sewing machine, the combination of a feed roll, a radially adjustable, continuously rotating eccentric, connecting means between said eceentric' and said feed roll for intermittently rotating said feed 40 roll, and means for automatically adjusting said eccentric in response to a variation in thickness of said work, including a cam, a continuously rotating member, transmission means between said member and said cam, and trip means in 45 yielding engagement with said work for rendering said transmission means operative.
16. In a sewing machine having a needle bar supported for reciprocatory movement toward and away from the work and for oscillatory move- 50 ment transversely of the direction of reciprocatory movement, the combination of means for continuously reciprocating said bar, a rotatable cam for oscillating said bar, a ratchet wheel for intermittently rotating said cam, a reciproeating pawl for actuating said ratchet wheel, means for continuously reciprocating said pawl,
a detent for holding said pawl out of engagement with said ratchet wheel, and means actuated by a variation in thickness of the work 60 for rendering said detent inoperative.
17. In a sewing machine having feeding means for intermittently advancing the work in a given direction, and stitch forming mechanism including a needle bar .supported for longitudinal re- 5 ciprocatory movement toward and away from the work and for oscillatory movement transversely of the direction of reciprocatory movement, the combination of means for continuously reciproeating said bar, and means for oscillating said 70 bar including a rotatable cam, a reciprocating member for rotating said cam, a detent for rendering 'said member inoperative to rotate said cam, and means contacting with said work and actuated by a variation in thickness of said work for renderingsaid detent inoperative.
18. In mechanism for oscillating the needle bar of a sewing machine transversely of the direction of longitudinal reciprocatory movement, the combination of a rotatable cam, a cam rod between said cam and said bar for oscillating said bar, a ratchet wheel for rotating said cam, a pawl for rotating said ratchet wheel, a detent for normally holding said pawl out of engagement with said ratchet wheel, and means for rendering said detent inoperative comprising a trip rod, a lever for actuating said trip rod, and a feeler contacting with the work to actuate said lever upon a variation in thickness of the work.
19. In a sewing machine having a work support and a needle bar mounted to reciprocate toward and away from said support and to oscillate transversely of the direction of reciprocation, trip mechanism for initiating the transverse oscillatory movement of the needle bar comprising a lever pivoted alongside said support, a feeler on said lever over said support, means for adjusting said feeler toward and away from said support, and resilient means regulated by the adjustment of said feeler for resisting movement of said feeler away from said support.
20. In a sewing machine having a work support, feeding means for advancing the work across said support, and adjustable means for varying the rate of feed of the work, trip mechanism for initiating the operation of said adjustable means comprising a rock shaft mounted alongside said support, a feeler extending from said rock shaft over said support, adjustable means for resiliently resisting movement of said feeler away from said support, and adjustable means for limiting the movement of said feeler toward said support.
21. In a machine for sewing eyelet tape or the like to successive lengths of fabric, the combination with stitch forming mechanism and work feeding mechanism of work supporting and guiding means comprising a bed plate having thereon an enclosed guide channel for a carrier tape extending from the front end thereof to a point in. advance of the stitch forming mechanism, the inner end of said channel communicating with the upper face of said bed plate, a guide member fixed to said bed plate and extending from front to rear thereof adjacent one edge of said guide channel, a retainer plate projecting from said guide member over said guide channel and spaced from said bed plate, a movable guide bar on said bed plate adjacent the opposite edge of said guide channel, and a projection extending from said movable guide member over said guideway.
22. In a machine for sewing eyelet tape or the I like to successive lengths of fabric, the combination with stitch forming mechanism of work supporting and feeding mechanism including a bed plate having thereon a covered guide channel for a carrier tape extending from the front end thereof to a point in advance of the stitch forming mechanism, the inner end of said guide channel opening upwardly to the surface of said bed plate, a guide member for one edge of the fabric and the adjacent edge of the eyelet tape, a guide member for the opposite edge of the eyelet tape, and means in the rear of said stitch forming mechanism for engaging said carrier tape to feed the same and for engaging with and feeding the work.
JOHN F. HAND.
US752441A 1934-11-10 1934-11-10 Sewing machine mechanism Expired - Lifetime US2089551A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2693778A (en) * 1952-06-06 1954-11-09 Harris Carl Embroidering mechanism for zigzag sewing machines
US2713837A (en) * 1952-01-03 1955-07-26 Louis M Rabinowitz Foundation Apparatus for assembling fastener elements
US3182616A (en) * 1962-10-11 1965-05-11 William C Cremer Sewing machine with pattern attachment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2713837A (en) * 1952-01-03 1955-07-26 Louis M Rabinowitz Foundation Apparatus for assembling fastener elements
US2693778A (en) * 1952-06-06 1954-11-09 Harris Carl Embroidering mechanism for zigzag sewing machines
US3182616A (en) * 1962-10-11 1965-05-11 William C Cremer Sewing machine with pattern attachment

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