US2069652A - Hemstitching attachment for sewing machines - Google Patents

Hemstitching attachment for sewing machines Download PDF

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Publication number
US2069652A
US2069652A US759146A US75914634A US2069652A US 2069652 A US2069652 A US 2069652A US 759146 A US759146 A US 759146A US 75914634 A US75914634 A US 75914634A US 2069652 A US2069652 A US 2069652A
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piercer
arm
bar
attachment
cloth
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US759146A
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George L Hinman
Clifford J Word
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Greist Manufacturing Co
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Greist Manufacturing Co
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B3/00—Sewing 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
    • D05B3/04—Sewing 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 with mechanisms for work feed

Definitions

  • This invention relates to devices for doing heinstitching work and particularly to an attachment for this purpose for the ordinary household sewing machine, and involves a number of improvements on the hemstitching attachment shown in the patent of Greist and Hinman, No. 1,986,056, granted January 1, 1935.
  • the present invention has for one of its objects the simplification and improvement of the hemstitching attachment shown in the patent above identified in. order to render such attachment more accurate and positive in operation in some respects and to make cheaper its construction and the assembly of the parts thereof.
  • Another object of the invention is the provision of a hemstitching device which will be relatively cheap to manufacture and assemble, and at the same time be eiiicient and positive in operation.
  • Another object of the invention is to provide a hemstitching attachment for household sewing machines in which the length of the feed step may be varied and readily reset to its original position.
  • Still another object of the invention is the provision of a hemstitching attachment for household sewing machines in which the piercer may be moved to inoperative position and thereafter returned precisely to its original position.
  • a still further object of our invention is to provide a hemstitching attachment for household sewing machines of improved design, construction and operation.
  • Fig. 1 is a side elevational view of our device as applied to an ordinary household sewing machine
  • Fig. 2 is a top plan view of the attachment
  • Fig. 3 is a side elevational view taken from the side opposite that shown in Fig. 1;
  • Fig. 4 is a sectional View on line 4-4 of Fig. 3;
  • Fig. 5 is a sectional View on line 55 of Fig. 2;
  • Fig. 6 is a detail view showing the feed operating mechanism
  • Fig. 7 is an enlarged side elevational View of the attachment alone
  • Fig. 8 is a sectional view on line 88 of Fig. '7;
  • Fig. 9 is a longitudinal sectional view through the attachment
  • Fig. 10 is an enlarged detail view of the piercer and supporting mechanism therefor;
  • Fig. 11 is a sectional view on line
  • Fig. 12 is a top plan View of the throat plate or cover
  • Fig. 13 is a sectional view on line l3l3 of Fig. 12;
  • Fig. 14 is a detail view of the piercer
  • Figs. 15 and 16 are detail views showing a modification oi the mechanism for moving the piercer arm laterally;
  • Fig. 17 is a sectional view on line ll'-l'l of Fig. 4.
  • Figs. 18 and 19 are respectively side and plan 1 views of a modified form of the attachment.
  • FIG. 1 a portion of the head it of a sewing machine having the usual presser bar H and needle bar 12, the latter carrying at its lower end ,theusual sewing needle I3.
  • the usual presser foot on a household sewing machine is removed from the presser bar I l and the attachment secured to the presser bar in place thereof, as will be hereinafter described, the attachment being provided with a presser foot of its own.
  • the usual feeding plate or feeding dog in a household sewing machine is covered by the throat plate or cover 14 as the attachment is provided with a feeding arrangement to feed the cloth therethrough in accordance with the requirements of the hemstitching operation, which are different from those of the usual sewing operation.
  • the parts of the attachment are supported upon a base or support comprising a horizontal base or plate portion provided with upstanding flanges i6 and ii at the side edges thereof.
  • the base plate is provided with a relatively large opening is adjacent its central portion, a small opening l9 rearwardly of the opening I3, and a slot 29 adjacent its rear edge. Adjacent the front edge, the plate i5 is extended forwardly and offset downwardly, as shown at 2 l terminating in a presser foot 22 provided with an opening 23 through which moves the ordinary machine needle and piercer of the hemstitching attachment.
  • the opening 23 in this instance is, roughly, of L-shaped formation and may be described as consisting of connecting longitudinal and transverse slots, the longitudinal slot being relatively narrow, as shown at 23 so that the metal of the presser foot at this point will extend fairly closely to the needle and piercer to furnish a substantial support to the cloth during the piercing operation.
  • the forward portion of the side flange I6 is extended to provide an integrally formed U-shaped member 24 designed to embrace the presser bar II and be secured thereto.
  • the member 24 is, as stated, an integral part of the flange l6 and formed into the proper shape to embrace the presser bar. This provides for the attaching of the attachment to the machine, the part 24 being secured to the presser bar by means of a screw passed through the opening 25 and threaded into the presser bar.
  • the flanges l6 and H are provided with aligned openings 21 and 28 to receive a rotatable shaft or arbor which eXtends through these flanges and carries some of the working parts of the device.
  • This shaft designated by thenumeral 29, is provided with an'enlarged portion 30 fitting in the opening 21 of the flange Hi to give the shaft a bearingtherein.
  • the latter is providedwith a reduced end portion upon which a cam 3
  • the shaft has a bearing in the opening in the flange I1.
  • a hub member 33 is non-rotatably keyed to the shaft by means of the tenon 33 formed on the enlarged portion 30.
  • This hub member is provided with stepped portions 34 and 35 upon which are non-rotatably secured the cams 34 and 35, the cam member 34 being spaced from the adjacent shoulder of the step portion 35 by an additional step portion 36.
  • a further reduced portion 31 of the hub member abuts the flange l1.
  • the toothed wheel 44 may be secured to the end of the shaft 29 by being pressed upon serrations 45 thereon, and the lever 42 mounted upon the enlarged portion 30 of this shaft against this wheel.
  • the cam members 34 and 35 are then secured upon the hub member 33*.
  • This hub member is then positioned between the flanges l6 and H.
  • the shaft 29,'with the lever 42 and wheel 44 thereon, is slipped through the opening in the hub member and through the flange H.
  • is mounted upon the reduced end of the shaft and the end of the shaft is then upset as at 33 to secure the parts in place.
  • An arm 41 is pivoted to the flange IT by means of a bolt passing through an opening in the arm and an opening 49 in the flange. This arm extends forwardly, and secured to its free end is the piercer head 50 carrying the piercer 5
  • the piercer head 50 is rotatably secured to a plate 50 the plate being secured to the forward end of the arm 41 by means of screws 52 at the ends of the plate which pass through slotted openings in the arm 41 so that the plateand piercer head may be adjusted to some extent The longitudinally of the arm 41.
  • the piercer head 50 is mounted to rotate on the base 50 around the opening receiving the screw 50*, so that by loosening this screwthe piercer head may be swung through an angle of from the position shown in Fig. 7 to that shown in Fig. 10 where the piercer is in a horizontal inoperative position. This will be done when it is desired to use the device for making a fancy stitch of some character, such as applique work instead of the usual hemstitching operation.
  • are provided with recesses 53 and 54, shown more especially in Fig. 9, to permit this adjustment of the piercer to inoperative position.
  • a spring 55 normally urges the arm 41 upwardiy in order to maintain its upper surface against the cam arms of the cam wheel 3
  • a lateral extension 41 formed on the forward part of, the arm 41 extends into the path of the needle bar
  • the piercer arm 41 will be moved downwardly and cause the piercer 5
  • the metal thereof Adjacent the intermediate portion of the bar, the metal thereof is displaced downwardly, as shown at 62, to provide a recess 63, and at its free end, at which the cloth enters, a pair of spring fingers E34 and are secured to the bar, which members are spaced so that the presser foot 22 is received between them.
  • a pair of spring fingers E34 and are secured to the bar Surrounding the members 64 and 65 are bands of rubber or similar friction material Eri and 65 These friction members engage'the cloth when the feed bar is pressed downwardly thereon, and as these fingers are resilient, the pressure exerted by them upon the cloth will always be substantially the same even though one may happen to be disposed at a slightly diiferent level than the other.
  • the feed bar is provided with teeth or serrations 66 which grip the cloth and provide for the forward feeding thereof.
  • lugs 52 and 68 Upon the feed bar 59 are provided vertically disposed lugs 52 and 68 which project upwardly through the opening l 8 in the plate l5 and which are disposed upon opposite sides of the cam wheel 35 to be engaged by the cam surfaces thereof. These lugs may be conveniently formed by striking up portions of the feed bar 61!, and are situated closely adjacent the recess 63. As shown in Fig. 4, the lug extends closely adjacent the pivoted arm 4'! so as to engage this arm and move it laterally when the feed bar is moved laterally. Upon the other or outer side of the arm 47, a post or pin 58* is secured to the feed bar so that the arm ll will be positively moved in both directions with the bar.
  • Figs. 15 and 16 a slight modification is shown wherein the arm il is provided with a depending lug or finger QT which extends through an elongated slot 4? in the feed bar 523.
  • This finger and slot connection may be used in place of the pin Mi and that portion of the lug 68 adjacent the arm ail, as it will effect lateral movements of the arm with the feed bar 59 and at the same time provide for longitudinal movements of the feed bar Bil relatively to the arm 41.
  • an L-shaped member 69 Secured to the feed bar 683 is an L-shaped member 69 which projects upwardly through the opening E9 of the plate E5, the arm being secured to the feed bar by the rivet iii.
  • a small lever H is pivoted to the member 59 by the rivet 12 so that it may be moved from the full-line position shown in Fig. 5 to the dotted-line position shown in that figure.
  • the lower end of the lever 7! is adapted to be engaged by the arm T3 of a bell crank lever pivoted at M to the flange H.
  • the other arm '55 of this lever is adapted to be engaged by the cam 34, the lever arms being provided at their ends with horizontal portions to render these engagements more positive.
  • the cam 35 to which reference has already been made, is provided upon its periphery with four cam surfaces Ti, each of which is followed by a dwell l! terminating in an abrupt shoulder l8, and the material of this wheel is displaced laterally at four points about its periphery, as shown at 79, to provide four lateral camming portions as well as the four vertical camming portions H.
  • These cams in conjunction with the movements of the feed bar, effect the forward and side movements of the cloth.
  • This cam wheel is substantially the same in construction and operation as that shown in the Greist and Hinman patent No. 1,986,056, above referred to. I
  • the feed bar is in the position. shown in Fig. 3, which is slightly above the presser foot 22, and the shoulder 18 of the cam lies in the recess 63.
  • the cam surface 71 will depress the feed bar downwardly upon. the cloth and slightly raise the presser foot therefrom, as
  • This ,forward feeding movement is accompl shed by the feed bar 56, and it will be recalled that this feed bar has, by the cam portion I! and dwell portion Ti been moved downwardly and held against the cloth.
  • the feeding movement of the feed bar is effected by the cam 34 and lever arm 13.
  • This cam has four curved or dwell portions 80 which are between the high shoulder portions 8
  • This spring is inclined in an upward direction so that it not only tends to draw the lug 12 toward the cam, but also tends to draw the feed bar upwardly toward the plate I5 when it is not held down by the cams TI and 11
  • the lever 42 is provided with a bifurcated end 89 providing a slot 90 within a which is adapted to be received the usual screw attached to the needle bar l2 of the sewing machine; so that this lever is operated by the reciprocating movements of the needle bar.
  • the pawl 43 simply rides freely over the teeth of the wheel 44, and the upward stroke of the needle bar is the effective stroke so far as concerns the efiective operation of the hemstitching attachment. It may also be observed that as there are twelve teeth upon the wheel'44, and three of these are employed during each complete cycle of operation of the hems'titching device, a complete revolution of the member 44 effects four hemstitching operations.
  • cam arms 58 and four separate cam surfaces upon each of the cam wheels 34 and 3% so that each of these members performs its particular operation four times during each revolution.
  • Each one of these cams performs one operation, therefore, during three upward strokes of the needle bar and lever 42.
  • the piercer 5! is shown more particularly in Fig. 14 and as there shown consists of a horizontal portion 5W and a vertical portion 5
  • the piercer itself is of a particular shape and design. Referring to Fig. 14, it will be noted that the arm 5! is not set exactly at right angles to the portion 5W, but instead the angle between these members is approximately 94, so that the vertical portion of the piercer points outwardly away from the line of stitching to a slight extent. On the other hand, the point of the piercer is not tapered equally upon both sides.
  • the bell crank lever comprising the lever arms l3 and I5 is supported'upon the screw 14, the shank 14 of which is received in an opening in a collar 14" upon the nut 14.
  • the opening is slightly eccentricto the collar so that by rotating the nut and collar, a slight adjustment of the pivotal point of the bell crank lever may be made.
  • the nut is thereafter secured in adjusted position by tightening the screw 14. It will be seen that this arrangement provides for a slight adjustment of this bell crank lever in order to adjust the length of the feeding step accurately to the distance between the piercer and needle. This adjustment will ordinarily be made at the factory when the device is assembled and will not be changed thereafter, as any change in the length of the feeding step for different kinds of work will be accomplished through the pivoted lever 1 I.
  • the throat plate I4 shown in Figs. 12 and 13 is, as stated, secured to the bed of the machine below the hemstitching attachment so as to cover the usual feed dog.
  • This throat plate is provided with a laterally elongated slot I4 for the piercer and an opening M for the needle rearwardly of this slot. It will be noted from reference to Figs. 12 and 13 that the metal of the upper surface of this throat plate is recessed forwardly and laterally about the needle opening l4 so that the mouth of this opening lies below the horizontal level of the upper surface of the plate.
  • a marker in the form of a line I4 is provided on the surface of the throat plate forwardly of the piercer slot l4 to indicate the correct setting of the point of the piercer laterally of the slot.
  • This line may advantageously be colored black so that it will be readily distinguishable as it will then be in contrast to the polished metal surface of the throat plate. This will indicate the correct setting of the piercer with respect to the adjustment provided by the setscrew 5l.
  • the needle bar l2 of the sewing machine has descended to make a stitch in the cloth. During the descent of this bar the end thereof strikes the part 4'! on the piercer arm and drives the piercer into the cloth to preform another hole to be madetherein. While this perforation is not essential at this time, it serves later to relieve the strain on the piercer arm when the latter in a subsequent step carries the piercer down through this same opening.
  • the needle bar l2 moves upwardly, the lever 42 is likewise moved upwardly and the pawl 43 moves the toothed wheel 44 through a distance equal to one tooths space, thus rotating the shaft 29. This causes one of the arms 58 (that shown in the recess 51 in Fig.
  • the piercer arm 4'! is likewise moved laterally at this time by contact of the lug 68 therewith. so that the piercer 5! is moved with the cloth, thus assisting in controlling the lateral movement of the cloth.
  • the needle bar 12 then descends to cause the needle to again enter the cloth and makea stitch to one side of the opening made by the piercer.
  • a second upward stroke of the lever 42 will be produced.
  • the cam surface 19 moves out of contact with the lug 68, and the surface of this member contacting with the lug 61 effects a return lateral movement to the right of the free end of the feed bar 60 to bring the cloth back to its original position.
  • This lateral movement is also aided by the spring 82 which occupies a slightly diagonal position when the feed bar is moved to one side.
  • the needle bar again descends and makes another stitch in the opening made by the piercer, thus completing the return side stitch soas to bring the parts in position for a forward feeding movement and for a forward stitch in the cloth.
  • the needle bar again ascends and eifects the third upward movement of the lever 41, the
  • cam arm 58 rides out of contact with the part '59 and drops into the recess 56, thus releasing the piercer arm 4'! and permitting it to be moved upwardly out of the cloth by the spring 55.
  • the lever arm 15 is caused to ride toward the high portion 8
  • the shoulder 18 of the cam wheel 39 drops into the recess 63 to permit the free end of the feed bar 60 to be raised upwardly out of contact with the cloth by the spring 82.
  • of the cam 34 rides upwardly out of contact with the lever arm 15 and thus releases this lug, which is secured to the feed bar 60 so that the latter will be moved forwardly by the spring 82 to its original position.
  • the parts are now in position for a subsequent cycle of operations, for when the needle bar again descends it will take a forward stitch in the cloth and strike the piercer head to cause the latter to be moved downwardly, as previously explained.
  • the notches 56 and 51 shown in the piercer arm in Fig. 7, for example, may be, and preferably are, omitted in the arm 41 shown in the modification in Figs. 18 and. 19.
  • the piercer arm is, however, provided with the extension l! which extends laterally into the path of the needle bar and is adapted to be engaged by the latter and moved downwardly through the cloth at each downward stroke of the needle bar.
  • the spring .55 moves the arm 41 upwardly when this movement is permitted by the upward movement of the needle bar, so that according to this construction the piercer arm follows the movements of the needle bar.
  • a hemstitching attachment for sewing machines including a feed bar adapted to engage and move the work, said feed bar being provided with resilient work-engaging means, said means comprising a pair of resilient members secured to the bar at their rear ends only and projecting forwardly therefrom.
  • a hemstitching attachment provided with a feed bar to impart a feeding movement to the work, said feed bar being provided adjacent one end with work-engaging means projecting forwardly of said bar, and said means being of resilient material and extending on opposite sides of the needle whereby the pressure upon the work upon opposite sides of the needle will be equalized.
  • a hemstitching attachment provided with a movable feed bar, and work-engaging means situated at one end of said bar, said means comprising a pair of laterally spaced spring fingers extending forwardly beyond the bar.
  • a hemstitching attachment provided with a movable feed bar, work-engaging means situated at one end of said bar, said means comprising a pair of laterally spaced spring fingers connected to the feed bar at their rear ends and extending forwardly from said bar, and friction means on the under sides of said fingers to engage the work.
  • a hemstitching attachment provided with a movable feed bar, work-engaging means situated at one end of said bar, said means comprising a pair of laterally spaced spring fingers, and the under side of said bar being provided with workengaging teeth rearwardly of said fingers.
  • a hemstitching attachment comprising a frame, a feed bar slidably connected with said frame, said slidable connection comprising a slot in one of said members and a headed pin in the other of said members, and said slot having an enlarged portion at one end thereof to permit the passage of the head of said pin to provide for detachment of the bar from the frame, and means normally preventing said pin head from registering with the enlarged portion of said opening.
  • a hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, and means to move said feed bar longitudinally of the frame including a rotatable cam member carried by the frame, a lever pivoted on a horizontal axis for actuation by said cam member, and a part secured to the feed bar and in turn actuated by said lever.
  • a hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, and means to move said feed bar longitudinally of the frame including a rotatable cam member carried by the frame, a lever actuated by said cam member, and a part secured to the feed bar and in turn actuated by said lever, said lever having an adjustable pivot whereby the length of the feed step may be adjusted.
  • a hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, means to move said feed bar longitudinally of the frame including a rotatable cam member carried by the frame, and an element pivoted on the frame on a horizontal axis, said element being actuated by said cam member and adapted to engage and move said feed bar.
  • a hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, means to move said feed bar longitudinally of the frame including a rotatable cam member carried by the frame, an element movably mounted on the frame actuated by said cam member and adapted to engage and move said feed bar, and means to adjust the throw of said element by said cam member.
  • a hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth-past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, means to move said feed bar longitudinally of the frame including a r0- tatable cam member carried by the frame, a bell crank lever pivoted to the frame having one arm thereof in engagement with said cam memher and another arm thereof in engagement with a part of said feed bar whereby the latter is actuated by the cam, and means to adjust the pivot of said lever to vary the length of the feed step.
  • a hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar'of the machine,
  • means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, means to move said feed bar longitudinally of the frame including a rOtatg able cam member carried by the frame, a part secured to said feed bar and actuated by said cam member, and means movable into position between said part and said cam member to vary the length of the feed step.
  • a hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, means to move said feed bar longitudinally of the frame including a rotatable cam member carried by the frame, a part secured to said feed bar and actuated by said cam member, and a pivoted element swingable into and out of position between said part and said cam member to vary the movement of the feed bar by the cam member.
  • a hemstitching attachment for sewing machines comprising a frame member, a feed bar slidably connected to said frame member for longitudinal movement, means to move said feed bar longitudinally of the frame comprising a cam rotatably mounted on the frame, a lug secured to the feed bar, a lever pivoted on the frame having one arm engaging said cam memher and the other arm engaging said lug, and an element pivoted to said lug and movable into and out of position between the lever arm and said lug to vary the movement of the feed bar by the cam member.
  • a hemstitching attachment comprising a frame member adapted to be attached to the presser bar of a sewing machine, means carried by said frame to feed the material laterally and forwardly of the machine, a piercer member, and a carrier for said piercer member movably associated with the frame, said piercer member being movably secured to the carrier for movement to inoperative position.
  • a hemstitching attachment comprising a frame member adapted to be attached to the presser bar of a sewing machine, means carried by said frame to feed the material laterally and forwardly of the machine, a piercer member, acarrier for said piercer member movably associated with the frame, said piercer member being movably secured to the carrier for movement to inoperative position, and a stop on the carrier to limit the resetting of said piercer memher to its original position.
  • a hemstitching attachment comprising a frame member adapted to be attached to the presser bar of a sewing machine, means carried by said frame to feed the material laterally and forwardly of the machine, an arm pivoted to the former member, a piercer head carried by said arm, and a piercer member carried by said head, said piercer head being pivotally secured to said arm to swing the piercer to inoperative position.
  • a hemstitching attachment comprising a frame member adapted to be attached to the presser bar of a sewing machine, means carried by said frame to feed the material laterally and forwardly of the machine, an arm pivoted to the former member, a piercer head carried by said arm, a piercer member carried by said head, said piercer head being pivotally secured to said arm to. swing the piercer to inoperative position, and means on said arm engaging said head to limit the movement of the piercer when reset to its original position.
  • a hemstitching attachment comprising a frame, operating mechanism on said frame for moving the cloth laterally and forwardly and for piercing openings in the cloth, said mechanism including a shaft rotatably mounted in the frame and actuated from the needle bar of the sewing machine, said shaft having an enlarged portion at one end thereof presenting a shoulder, a ratchet wheel non-rotatably secured upon said end, a hub member lodged against said shoulder, a key upon said shoulder and said hub having a key way facing the shoulder in which the key is received.
  • a hemstitching attachment comprising a frame, a feed bar operatively connected to the frame for lateral and longitudinal movements relatively thereto, a piercer arm pivoted to the frame for vertical movement relatively thereto, and means connecting said piercer arm to said feed bar to positively move the former laterally with the latter in both directions, said means permitting vertical movement of the piercer arm independently of the feed bar.
  • a hemstitching attachment comprising a frame, a feed bar operatively connected to the frame for lateral and longitudinal movements relatively thereto, a piercer arm pivoted to the frame for vertical movement relatively thereto, and means connecting said piercer arm to said feed bar to move the former laterally with the latter in both directions, said means permitting vertical movement of the piercer arm independently of the feed bar, and said means comprising projections on said feed bar, one engaging each side of said piercer arm.
  • a hemstitching attachment comprising a frame, a feed bar operatively connected to the frame for lateral and longitudinal movements relatively thereto, a piercer arm pivoted to the frame for vertical movement relatively thereto, means connecting said piercer arm to said feed bar to move the former laterally with the laiter in both directions, said means permitting vertical movement of the piercer arm independently of the feed bar and said means comprising a depending finger on said piercer arm, and a slot provided in said feed bar into which said finger extends.
  • An L-shaped piercer member for hemstitching devices comprising a horizontal supporting portion and a vertical operating portion having a pointed end, said portions being disposed at an obtuse angle one to the other, and the taper of the point of said piercer being less on one side than on the other.
  • a hemstitching device having a piercer member, means for mounting said piercer member in said device at an angle slightly inclined to the vertical, said piercer member having a pointed end, and said point being eccentric to the axis of said piercer.
  • a hemstitching device having a piercer member, means for mounting said piercer member in said device at an angle slightly inclined to the vertical, said piercer member having a pointed end, and said point being nearer that side of said piercer making an acute angle with the horizontal than to the opposite side.
  • a hemstitching attachment adapted to be secured to the presser bar of a sewing machine, a throat plate adapted to cover the feeding dog of the sewing machine below said attachment:
  • said attachment having a piercer member, said throat plate having an opening for said piercer memberand an opening for the sewing machine needle, and said plate being provided with a depression in its upper surface forwardly and at one side of said needle opening.
  • a throat plate for use with a sewing machine hemstitching attachment having a piercer, said throat plate having an opening to receive the piercer, said opening being elongated transversely of the direction of travel of goods through the machine, and indicating means on said throat plate intermediate the ends of, and adjacent the edge of, said opening to mark the position of the piercer.
  • a hemstitching attachment for sewing machines comprising a frame adapted to be attached to the presser bar of the machine, an arm hinged to the frame, a piercer carried by said arm, means attached to said arm and extending into the path of movement of the needle bar of the sewing machine whereby the descent of the needle bar strikes said means and forces the piercer downwardly, spring means to cause said arm to follow the needle bar upon the upward stroke of the latter, and means having fixed position with respect to the path of movement of the armto limit the upward movement thereof.
  • a hemstitching attachment for sewing machines having a presser bar and a needle bar, said attachment comprising a frame adapted to be attached to the presser bar, an arm pivoted to said frame, a piercer secured to said arm, and means for effecting upward and downward movement of said arm in synchronism with the movement of the needle bar.
  • a hemstitching attachment for sewing machines having a needle bar and a presser bar
  • said attachment comprising a, frame adapted to be attached to the presser bar, a piercer arm pivotally secured to the frame and carrying a piercer adjacent one end thereof, means secured to said arm and extending in the path of the needle bar whereby the latter forces the piercer arm downwardly, means. to raise the piercer arm upwardly after each stroke of the needle bar and means having fixed position with respect to the path of movement of the arm to limit the upward movement thereof.
  • a hemstitching attachment for sewing machines comprising a frame, a presser foot carried by said frame, a piercing device movably mounted on the frame, said presser foot being provided with an opening to permit passage of the piercing device and sewing needle therethrough, and the portion of said opening adjacent the piercing device being enlarged laterally with respect to the remainder of said opening to permit lateral movement of the piercing device and provide support of the work by the edges of said opening closely adjacent said device.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Description

G. L. HINMAN ET AL HEMSTITCHING ATTACHMENT FOR SEWING MACHINES Feb. 2, 1937.
4 Sheets-Sheet 1 Filed Dec. 26, 1954 Feb. 2, 1937- G. L. HINMAN El AL HEMSTITCHiNG ATTACHMENT FOR SEWING MACHINES 4 Sheets-Sheet '2 Filed Dec. 26, 1934 S t w 1937- G. HINMAN ET AL HEMSTITCHING ATTACHMENT FOR SEWING MACHINES Filed Dec. 26, 1954 4 Sheets-Sheet. 3
v amen 1M5 on W ' Feb. 2, 1937. G. L HINMAN ET AL HEMSTITCHING ATTACHMENT FOR SEWING MACHINES 4 Sheets-Sheet 4 Filed Dec. 26, 1934 awn Mags W G -W Patented Feb. 2, 1937 UNITED sTA'rs rArs HEMSTITCHING ATTACHMENT FOR SEWING MACHINES Application December 26, 1934, Serial No. 759,146
34 Claims.
This invention relates to devices for doing heinstitching work and particularly to an attachment for this purpose for the ordinary household sewing machine, and involves a number of improvements on the hemstitching attachment shown in the patent of Greist and Hinman, No. 1,986,056, granted January 1, 1935.
While devices have been proposed heretofore which are designed for attachment to the usual household sewing machine, in order to perform hemstitching operations thereupon, these devices in some respects are of complicated construction and for that reason are more or less expensive to manufacture and difi'icult to maintain in proper working order.
The present invention has for one of its objects the simplification and improvement of the hemstitching attachment shown in the patent above identified in. order to render such attachment more accurate and positive in operation in some respects and to make cheaper its construction and the assembly of the parts thereof.
Another object of the invention is the provision of a hemstitching device which will be relatively cheap to manufacture and assemble, and at the same time be eiiicient and positive in operation.
Another object of the invention is to provide a hemstitching attachment for household sewing machines in which the length of the feed step may be varied and readily reset to its original position.
Still another object of the invention is the provision of a hemstitching attachment for household sewing machines in which the piercer may be moved to inoperative position and thereafter returned precisely to its original position.
A still further object of our invention is to provide a hemstitching attachment for household sewing machines of improved design, construction and operation.
To these and other ends, the invention consists in the novel features and combinations of parts to be hereinafter described and claimed.
In the drawings:
Fig. 1 is a side elevational view of our device as applied to an ordinary household sewing machine;
Fig. 2 is a top plan view of the attachment;
Fig. 3 is a side elevational view taken from the side opposite that shown in Fig. 1;
Fig. 4 is a sectional View on line 4-4 of Fig. 3;
Fig. 5 is a sectional View on line 55 of Fig. 2;
Fig. 6 is a detail view showing the feed operating mechanism;
Fig. 7 is an enlarged side elevational View of the attachment alone;
Fig. 8 is a sectional view on line 88 of Fig. '7;
Fig. 9 is a longitudinal sectional view through the attachment;
Fig. 10 is an enlarged detail view of the piercer and supporting mechanism therefor;
Fig. 11 is a sectional view on line |l--ll of Fig. 7;
Fig. 12 is a top plan View of the throat plate or cover;
Fig. 13 is a sectional view on line l3l3 of Fig. 12;
Fig. 14 is a detail view of the piercer;
Figs. 15 and 16 are detail views showing a modification oi the mechanism for moving the piercer arm laterally;
Fig. 17 is a sectional view on line ll'-l'l of Fig. 4; and
Figs. 18 and 19 are respectively side and plan 1 views of a modified form of the attachment.
To illustrate a preferred embodiment of our invention, We have shown in Fig. 1 a portion of the head it of a sewing machine having the usual presser bar H and needle bar 12, the latter carrying at its lower end ,theusual sewing needle I3.
In the use of the attachment herein described, the usual presser foot on a household sewing machine is removed from the presser bar I l and the attachment secured to the presser bar in place thereof, as will be hereinafter described, the attachment being provided with a presser foot of its own. Also, the usual feeding plate or feeding dog in a household sewing machine is covered by the throat plate or cover 14 as the attachment is provided with a feeding arrangement to feed the cloth therethrough in accordance with the requirements of the hemstitching operation, which are different from those of the usual sewing operation.
The parts of the attachment are supported upon a base or support comprising a horizontal base or plate portion provided with upstanding flanges i6 and ii at the side edges thereof. The base plate is provided with a relatively large opening is adjacent its central portion, a small opening l9 rearwardly of the opening I3, and a slot 29 adjacent its rear edge. Adjacent the front edge, the plate i5 is extended forwardly and offset downwardly, as shown at 2 l terminating in a presser foot 22 provided with an opening 23 through which moves the ordinary machine needle and piercer of the hemstitching attachment.
It will be seen that the opening 23 in this instance is, roughly, of L-shaped formation and may be described as consisting of connecting longitudinal and transverse slots, the longitudinal slot being relatively narrow, as shown at 23 so that the metal of the presser foot at this point will extend fairly closely to the needle and piercer to furnish a substantial support to the cloth during the piercing operation.
The forward portion of the side flange I6 is extended to provide an integrally formed U-shaped member 24 designed to embrace the presser bar II and be secured thereto. The member 24 is, as stated, an integral part of the flange l6 and formed into the proper shape to embrace the presser bar. This provides for the attaching of the attachment to the machine, the part 24 being secured to the presser bar by means of a screw passed through the opening 25 and threaded into the presser bar.
The flanges l6 and H are provided with aligned openings 21 and 28 to receive a rotatable shaft or arbor which eXtends through these flanges and carries some of the working parts of the device. This shaft, designated by thenumeral 29, is provided with an'enlarged portion 30 fitting in the opening 21 of the flange Hi to give the shaft a bearingtherein. At the other end of the shaft the latter is providedwith a reduced end portion upon which a cam 3| is secured by being forced against the shoulder 32 by the upset end 33 of the shaft. At this end the shaft has a bearing in the opening in the flange I1. A hub member 33 is non-rotatably keyed to the shaft by means of the tenon 33 formed on the enlarged portion 30. This hub member is provided with stepped portions 34 and 35 upon which are non-rotatably secured the cams 34 and 35, the cam member 34 being spaced from the adjacent shoulder of the step portion 35 by an additional step portion 36. A further reduced portion 31 of the hub member abuts the flange l1. Upon the part 30 of this shaft is rotatably mounted a lever 42 having a pawl 43 pivoted thereon, which pawl is in engagement with a toothed wheel 44 non-rotatably secured upon the end of the shaft 29. lever 42 is thus loosely mounted between the toothed wheel 44 and the flange Hi.
It will be apparent that this provides a very convenient arrangement for the manufacture and assembly of these parts, shown more especially in Fig. 4. The toothed wheel 44 may be secured to the end of the shaft 29 by being pressed upon serrations 45 thereon, and the lever 42 mounted upon the enlarged portion 30 of this shaft against this wheel. The cam members 34 and 35 are then secured upon the hub member 33*. This hub member is then positioned between the flanges l6 and H. The shaft 29,'with the lever 42 and wheel 44 thereon, is slipped through the opening in the hub member and through the flange H. The cam member 3| is mounted upon the reduced end of the shaft and the end of the shaft is then upset as at 33 to secure the parts in place.
An arm 41 is pivoted to the flange IT by means of a bolt passing through an opening in the arm and an opening 49 in the flange. This arm extends forwardly, and secured to its free end is the piercer head 50 carrying the piercer 5|.
The piercer head 50 is rotatably secured to a plate 50 the plate being secured to the forward end of the arm 41 by means of screws 52 at the ends of the plate which pass through slotted openings in the arm 41 so that the plateand piercer head may be adjusted to some extent The longitudinally of the arm 41. The piercer head 50 is mounted to rotate on the base 50 around the opening receiving the screw 50*, so that by loosening this screwthe piercer head may be swung through an angle of from the position shown in Fig. 7 to that shown in Fig. 10 where the piercer is in a horizontal inoperative position. This will be done when it is desired to use the device for making a fancy stitch of some character, such as applique work instead of the usual hemstitching operation. When it is desired to return the piercer to its normal positionthat shown in Fig. 7the screw 5|] may be loosened and the piercer head is swung downwardly until the horizontal portion 5| e of the piercer strikes against the shoulder 50 on the plate 50. This effectively locates the piercer in the proper verti-- cal position for the hemstitching operation so that it may always be moved back exactly to its original position.
The forward end of the arm 41 and the plate 5| are provided with recesses 53 and 54, shown more especially in Fig. 9, to permit this adjustment of the piercer to inoperative position.
A spring 55 normally urges the arm 41 upwardiy in order to maintain its upper surface against the cam arms of the cam wheel 3|. Adjacent the cam wheel, the upper surface of the arm is provided with notches 55 and 51 to receive these cam arms 58. It will be apparent that upon rotation of the shaft 29 by operation of the lever 42 and pawl 43, the cam wheel will be rotated in the direction of the arrow shown in Fig. 1. One of the arms 58 will be caused to enter the notch 51, and upon further rotation it will ride up upon the high portion 59 between the notches 56 and 51 and depress the arm 41 to cause the piercer to enter the cloth. The depressedposition of this arm is shown in Fig. 7. Further rotation of the shaft 29 will cause this arm 58 to move opposite the notch 56, at which time the spring 55 will cause the arm 41 to move upwardly to withdraw the piercer from the cloth, and this upward movement will be checked by the engagement of the following arm 58 inv the notch 51. There are four of these arms upon the cam 3|, while there are twelve teeth uponthe wheel 44; thus one stroke of the piercer arm will be effected for each three upward movements of the lever 42.
A lateral extension 41 formed on the forward part of, the arm 41 extends into the path of the needle bar |2 so that when the latter descends, the
arm 41 will be moved downwardly and cause the piercer 5| to enter the cloth to preform an opening therein prior to the downward movement of the piercer effected by the cam wheel 3|. It will be understood that the piercer is one step in advance of the needle so that while the latter is entering one opening, the former will be making a subsequent opening. It is therefore very important to have the step-by-step feed of the material upon which the hemstitching is being done conform exactly to the distance between the piercer and the needle.
The forward feeding movement of the clothis effected by means of a feed bar 60 plvotally and slidably secured to the plate |5 adjacent one end by means of the rivet 6| secured in the body of the feed bar 60 and having its body portion passing throughthe slot 20. This is not a true pivotal attachment, but nevertheless will permit a pivotal movement as well as a sliding movebe raised and lowered to engage and disengage the cloth. It will be noted that the opening 20 is enlarged at its rear end, as shown at 29 to permit the head of the rivet 6| to pass through the opening 29 so as to detach the feed bar when desired. It will be understood that in ordinary movements of the bar, the rivet does not move sufficiently far in a rearward direction for the rivet head to register with this enlarged part of the opening.
Adjacent the intermediate portion of the bar, the metal thereof is displaced downwardly, as shown at 62, to provide a recess 63, and at its free end, at which the cloth enters, a pair of spring fingers E34 and are secured to the bar, which members are spaced so that the presser foot 22 is received between them. Surrounding the members 64 and 65 are bands of rubber or similar friction material Eri and 65 These friction members engage'the cloth when the feed bar is pressed downwardly thereon, and as these fingers are resilient, the pressure exerted by them upon the cloth will always be substantially the same even though one may happen to be disposed at a slightly diiferent level than the other. This will provide for a straight-line feeding of the cloth, which would otherwise not be the case, for when one finger bears more firmly upon the cloth than the other, the latter is apt to be fed more upon one side than the other. The rubber bands around the spring fingers will grip the cloth to effect a lateral feeding thereof during the hemstitching operation.
Between the rear ends of these sprin fingers, the feed bar is provided with teeth or serrations 66 which grip the cloth and provide for the forward feeding thereof.
Upon the feed bar 59 are provided vertically disposed lugs 52 and 68 which project upwardly through the opening l 8 in the plate l5 and which are disposed upon opposite sides of the cam wheel 35 to be engaged by the cam surfaces thereof. These lugs may be conveniently formed by striking up portions of the feed bar 61!, and are situated closely adjacent the recess 63. As shown in Fig. 4, the lug extends closely adjacent the pivoted arm 4'! so as to engage this arm and move it laterally when the feed bar is moved laterally. Upon the other or outer side of the arm 47, a post or pin 58* is secured to the feed bar so that the arm ll will be positively moved in both directions with the bar.
In Figs. 15 and 16, a slight modification is shown wherein the arm il is provided with a depending lug or finger QT which extends through an elongated slot 4? in the feed bar 523. This finger and slot connection may be used in place of the pin Mi and that portion of the lug 68 adjacent the arm ail, as it will effect lateral movements of the arm with the feed bar 59 and at the same time provide for longitudinal movements of the feed bar Bil relatively to the arm 41.
Secured to the feed bar 683 is an L-shaped member 69 which projects upwardly through the opening E9 of the plate E5, the arm being secured to the feed bar by the rivet iii. A small lever H is pivoted to the member 59 by the rivet 12 so that it may be moved from the full-line position shown in Fig. 5 to the dotted-line position shown in that figure. The lower end of the lever 7! is adapted to be engaged by the arm T3 of a bell crank lever pivoted at M to the flange H. The other arm '55 of this lever is adapted to be engaged by the cam 34, the lever arms being provided at their ends with horizontal portions to render these engagements more positive.
When the lever H is in the position shown in Fig. 6 and in the full lines of Fig. 5, the arm I3 strikes against the lower end of this lever and moves the feed bar 60 rearwardly, the rivet or pin 6! sliding through the slot 20. When the lever H is moved to the dotted-line position as shown in Fig. 5, the lower end thereof will no longer be in the path of the lever arm 13 but in this instance the lever arm I3 will strike against the member 69 and effect a feeding movement of the bar 60, which movement, however, will be shorter than the regular movement effected through the engagement with the lever Tl. This shorter movement will be used with a fancy stitch or work other than hemstitching when the piercer has been moved to inoperative position. It will be apparent that when the lever is moved upwardly again to full-line position, the normal feed step will be restored, so that if the operator has shortened the feed, he may thereafter readily restore it to its exact original adjustment where it will properly register with the distance between the needle and piercer. A spring washer H is placed under the head of the rivet to hold the lever in adjusted position.
The cam 35, to which reference has already been made, is provided upon its periphery with four cam surfaces Ti, each of which is followed by a dwell l! terminating in an abrupt shoulder l8, and the material of this wheel is displaced laterally at four points about its periphery, as shown at 79, to provide four lateral camming portions as well as the four vertical camming portions H. These cams, in conjunction with the movements of the feed bar, effect the forward and side movements of the cloth. This cam wheel is substantially the same in construction and operation as that shown in the Greist and Hinman patent No. 1,986,056, above referred to. I
At the beginning of the operation of the device, the feed bar is in the position. shown in Fig. 3, which is slightly above the presser foot 22, and the shoulder 18 of the cam lies in the recess 63. When the arm 42 is brought upwardly to turn the shaft 29, the cam surface 71 will depress the feed bar downwardly upon. the cloth and slightly raise the presser foot therefrom, as
shown, for example, in Fig. 9. Continued move-' ment of the lever 42 will cause the lateral cam portion 19 to pass between the lugs 61 and 68 and move the feed bar and cloth to the left, as shown in Fig. 8. A second stroke of the lever 42 causes the dwell ill of the cam wheel to hold the feed bar upon the cloth while the cam i portion 19 effects a return of the feed bar to the right from the position shown in Fig. 8'. The needle then moves downwardly and. effects another stitch in the opening made by the piercer and the parts are then in position for a forward feeding of the cloth.
This ,forward feeding movementis accompl shed by the feed bar 56, and it will be recalled that this feed bar has, by the cam portion I! and dwell portion Ti been moved downwardly and held against the cloth. The feeding movement of the feed bar is effected by the cam 34 and lever arm 13. This cam has four curved or dwell portions 80 which are between the high shoulder portions 8|, these surfaces being in position to engage against the horizontal portion of the lever arm 85, the lever arm being held against the cam by means of the spring 82 connected at one end to the lug 6'! and at the other end to a stud 83 onthe flange Hi. This spring is inclined in an upward direction so that it not only tends to draw the lug 12 toward the cam, but also tends to draw the feed bar upwardly toward the plate I5 when it is not held down by the cams TI and 11 On one side of the high point 8| on the cam 34 is an abrupt shoulder 8| providing a depression into which the arm 15 drops to permit the feed bar to be returned to its original position by its spring.
The lever 42 is provided with a bifurcated end 89 providing a slot 90 within a which is adapted to be received the usual screw attached to the needle bar l2 of the sewing machine; so that this lever is operated by the reciprocating movements of the needle bar. It will of course be understood that during the downward movements of the needle bar, the pawl 43 simply rides freely over the teeth of the wheel 44, and the upward stroke of the needle bar is the effective stroke so far as concerns the efiective operation of the hemstitching attachment. It may also be observed that as there are twelve teeth upon the wheel'44, and three of these are employed during each complete cycle of operation of the hems'titching device, a complete revolution of the member 44 effects four hemstitching operations. Thus there are four cam arms 58 and four separate cam surfaces upon each of the cam wheels 34 and 3%, so that each of these members performs its particular operation four times during each revolution. Each one of these cams performs one operation, therefore, during three upward strokes of the needle bar and lever 42.
The piercer 5! is shown more particularly in Fig. 14 and as there shown consists of a horizontal portion 5W and a vertical portion 5| The horizontal portion is secured in an opening 51 in the piercer head 50, as shown more particular-- ly in Fig. 11, and is held in place by means of the setscrew 5W, shown in Fig. 7. By loosening this screw, a lateral adjustment of the piercer may be effected.
The piercer itself is of a particular shape and design. Referring to Fig. 14, it will be noted that the arm 5! is not set exactly at right angles to the portion 5W, but instead the angle between these members is approximately 94, so that the vertical portion of the piercer points outwardly away from the line of stitching to a slight extent. On the other hand, the point of the piercer is not tapered equally upon both sides. About one-third of the taper is provided upon what may be termed the inside, as shown at 5l and about two-thirds of the taper upon the opposite side, as shown at El This causes the inner edge of the piercer to lie closely against the line of stitching on it downward stroke during the second travel of the goods through the machine and provides for the goods to be pulled mainly away from the line of stitching during the stroke so that the stitching is not interfered with, and at the same time a full-sized opening will be effected. At the same time the slightly obtuse angle of .the verticalportion of the piercer throws the point thereof outwardly to a sufficient extent so that the'point will always clear the line of stitching and not foul or cut it during its downward movement;
As shown more es ecially in Fig. 5, the bell crank lever comprising the lever arms l3 and I5 is supported'upon the screw 14, the shank 14 of which is received in an opening in a collar 14" upon the nut 14. The opening is slightly eccentricto the collar so that by rotating the nut and collar, a slight adjustment of the pivotal point of the bell crank lever may be made. The nut is thereafter secured in adjusted position by tightening the screw 14. It will be seen that this arrangement provides for a slight adjustment of this bell crank lever in order to adjust the length of the feeding step accurately to the distance between the piercer and needle. This adjustment will ordinarily be made at the factory when the device is assembled and will not be changed thereafter, as any change in the length of the feeding step for different kinds of work will be accomplished through the pivoted lever 1 I.
The throat plate I4 shown in Figs. 12 and 13 is, as stated, secured to the bed of the machine below the hemstitching attachment so as to cover the usual feed dog. This throat plate is provided with a laterally elongated slot I4 for the piercer and an opening M for the needle rearwardly of this slot. It will be noted from reference to Figs. 12 and 13 that the metal of the upper surface of this throat plate is recessed forwardly and laterally about the needle opening l4 so that the mouth of this opening lies below the horizontal level of the upper surface of the plate. The portion of the cloth in which the opening has been made by the piercer passing downwardly through the lateral opening l4 is next fed over the needle opening M As the metal between these openings is below the surface of the plate, this metal will not form such an abrupt shoulder as would otherwise be the case, so that the burr which'usuaily occurs on the lower side of the cloth due to the thrust of the piercer therethrough will not be drawn over a sharp shoulder and thus forced back into the opening to fill the same. The same action takes place when the cloth is moved laterally, as there is a lateral depression to the left of the needle opening, as shown in Fig. 12, and thus whenthe cloth is moved to the left, the burr will not be pressed upwardly into the opening.
A marker in the form of a line I4 is provided on the surface of the throat plate forwardly of the piercer slot l4 to indicate the correct setting of the point of the piercer laterally of the slot. This line may advantageously be colored black so that it will be readily distinguishable as it will then be in contrast to the polished metal surface of the throat plate. This will indicate the correct setting of the piercer with respect to the adjustment provided by the setscrew 5l A brief description of the entire operation of the device may now be helpful. Assuming that a hole has been made in the cloth by the piercer and the cloth has been fed forwardly so that the needle now registers with this hole, with the parts in the position shown in Figs. 1, 2 and 3, the needle bar l2 of the sewing machine has descended to make a stitch in the cloth. During the descent of this bar the end thereof strikes the part 4'! on the piercer arm and drives the piercer into the cloth to preform another hole to be madetherein. While this perforation is not essential at this time, it serves later to relieve the strain on the piercer arm when the latter in a subsequent step carries the piercer down through this same opening. When the needle bar l2 moves upwardly, the lever 42 is likewise moved upwardly and the pawl 43 moves the toothed wheel 44 through a distance equal to one tooths space, thus rotating the shaft 29. This causes one of the arms 58 (that shown in the recess 51 in Fig. 7) to ride upwardly upon the surface 59 and moves the piercer arm 41 downwardly, thus moving the piercer 5| through the same hole in the cloth made, as described above, at the time of the previous descent of the needle bar and tending to increase the size of the hole. At the time that the piercer member is moving downwardly the cam surface ll will move the feed bar 60 downwardly in contact with the cloth, thus slightly raising the presser foot 22. Thereafter, but still during the first stroke of the lever 42, the lateral cam surface 19 upon the cam wheel 35 will engage the lug 68 to move the front end of the feed bar 60 from the position shown in Fig. 2 to the position shown in Fig. 7
so that the cloth will have been moved laterally to the left. The piercer arm 4'! is likewise moved laterally at this time by contact of the lug 68 therewith. so that the piercer 5! is moved with the cloth, thus assisting in controlling the lateral movement of the cloth.
The needle bar 12 then descends to cause the needle to again enter the cloth and makea stitch to one side of the opening made by the piercer. When the needle bar again moves upwardly, a second upward stroke of the lever 42 will be produced. During this stroke the cam surface 19 moves out of contact with the lug 68, and the surface of this member contacting with the lug 61 effects a return lateral movement to the right of the free end of the feed bar 60 to bring the cloth back to its original position. This lateral movement is also aided by the spring 82 which occupies a slightly diagonal position when the feed bar is moved to one side.
The needle bar again descends and makes another stitch in the opening made by the piercer, thus completing the return side stitch soas to bring the parts in position for a forward feeding movement and for a forward stitch in the cloth. When the needle bar again ascends and eifects the third upward movement of the lever 41, the
cam arm 58 rides out of contact with the part '59 and drops into the recess 56, thus releasing the piercer arm 4'! and permitting it to be moved upwardly out of the cloth by the spring 55.
Thereafter, the lever arm 15 is caused to ride toward the high portion 8| of the cam 34 and thus move the feed bar .60 to the right, as shown in Fig. 9, to effect a forward feeding movement of the cloth. Just prior to the end of this forward feeding movement, the shoulder 18 of the cam wheel 39 drops into the recess 63 to permit the free end of the feed bar 60 to be raised upwardly out of contact with the cloth by the spring 82. Just after this has taken place, the high point 8| of the cam 34 rides upwardly out of contact with the lever arm 15 and thus releases this lug, which is secured to the feed bar 60 so that the latter will be moved forwardly by the spring 82 to its original position. The parts are now in position for a subsequent cycle of operations, for when the needle bar again descends it will take a forward stitch in the cloth and strike the piercer head to cause the latter to be moved downwardly, as previously explained.
It will be understood that in order to effect a complete hemstitching operation, it is necessary that the cloth be passed through the attachment twice. After passing through the machine once, as above described, it is turned end for end and again put through the attachment. On this second travel of the cloth through the machine, it will be understood that as the cloth is put through in the opposite direction, the lateral stitches will be made on the side of the openings opposite that upon which they were made during the first travel of the cloth, thus completing the hemstitching operation.
In the form of my device which has heretofore been described, it will be recalled that while the piercer is first moved downwardly by engagement of the needle bar with the member or extension 41*, subsequently the piercer is moved downwardly through the same opening in the cloth by one of the arms of the cam 3|. In Figs. 18 and 19 of the drawings, I have shown a somewhat modified form of attachment wherein the piercer is operated entirely by the needle barand moves upwardly and downwardly in synchronism with the movements of the needle bar. According to the modification shown in these figures of the drawings, the cam wheel 31 is replaced by the circular disk 3H. This disk merely acts as a stop for the piercer arm 41 to limit the upward movement of the latter. The notches 56 and 51 shown in the piercer arm in Fig. 7, for example, may be, and preferably are, omitted in the arm 41 shown in the modification in Figs. 18 and. 19. The piercer arm is, however, provided with the extension l! which extends laterally into the path of the needle bar and is adapted to be engaged by the latter and moved downwardly through the cloth at each downward stroke of the needle bar. The spring .55 moves the arm 41 upwardly when this movement is permitted by the upward movement of the needle bar, so that according to this construction the piercer arm follows the movements of the needle bar. It will of course be understood that in this instance the piercer is not held downwardly in the opening in the cloth during the lateral movement of the cloth but is carried upwardly by the spring 55 after each downward stroke along with the needle bar, so that it is not engaged in the opening in the cloth when the latter is moved in a lateral direction. In other respects the modification shown in Figs. 18 and 19 is similar to that shown in Figs. 1 to 14.
While we have shown and described a preferred embodiment of the invention, it will be understood that it is not to be limited to all of the details shown, but is capable of modification and variation within the spirit of the invention and within the scope of the appended claims.
What we claim is:
1. A hemstitching attachment for sewing machines including a feed bar adapted to engage and move the work, said feed bar being provided with resilient work-engaging means, said means comprising a pair of resilient members secured to the bar at their rear ends only and projecting forwardly therefrom.
2. A hemstitching attachment provided with a feed bar to impart a feeding movement to the work, said feed bar being provided adjacent one end with work-engaging means projecting forwardly of said bar, and said means being of resilient material and extending on opposite sides of the needle whereby the pressure upon the work upon opposite sides of the needle will be equalized.
3. A hemstitching attachment provided with a movable feed bar, and work-engaging means situated at one end of said bar, said means comprising a pair of laterally spaced spring fingers extending forwardly beyond the bar.
4. A hemstitching attachment provided with a movable feed bar, work-engaging means situated at one end of said bar, said means comprising a pair of laterally spaced spring fingers connected to the feed bar at their rear ends and extending forwardly from said bar, and friction means on the under sides of said fingers to engage the work.
5. A hemstitching attachment provided with a movable feed bar, work-engaging means situated at one end of said bar, said means comprising a pair of laterally spaced spring fingers, and the under side of said bar being provided with workengaging teeth rearwardly of said fingers.
6. A hemstitching attachment comprising a frame, a feed bar slidably connected with said frame, said slidable connection comprising a slot in one of said members and a headed pin in the other of said members, and said slot having an enlarged portion at one end thereof to permit the passage of the head of said pin to provide for detachment of the bar from the frame, and means normally preventing said pin head from registering with the enlarged portion of said opening.
'7. A hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, and means to move said feed bar longitudinally of the frame including a rotatable cam member carried by the frame, a lever pivoted on a horizontal axis for actuation by said cam member, and a part secured to the feed bar and in turn actuated by said lever.
8. A hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, and means to move said feed bar longitudinally of the frame including a rotatable cam member carried by the frame, a lever actuated by said cam member, and a part secured to the feed bar and in turn actuated by said lever, said lever having an adjustable pivot whereby the length of the feed step may be adjusted.
9. A hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, means to move said feed bar longitudinally of the frame including a rotatable cam member carried by the frame, and an element pivoted on the frame on a horizontal axis, said element being actuated by said cam member and adapted to engage and move said feed bar.
10. A hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, means to move said feed bar longitudinally of the frame including a rotatable cam member carried by the frame, an element movably mounted on the frame actuated by said cam member and adapted to engage and move said feed bar, and means to adjust the throw of said element by said cam member.
11. A hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth-past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, means to move said feed bar longitudinally of the frame including a r0- tatable cam member carried by the frame, a bell crank lever pivoted to the frame having one arm thereof in engagement with said cam memher and another arm thereof in engagement with a part of said feed bar whereby the latter is actuated by the cam, and means to adjust the pivot of said lever to vary the length of the feed step.
12. A hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar'of the machine,
means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, means to move said feed bar longitudinally of the frame including a rOtatg able cam member carried by the frame, a part secured to said feed bar and actuated by said cam member, and means movable into position between said part and said cam member to vary the length of the feed step.
13. A hemstitching attachment for sewing machines comprising a frame member adapted to be secured to the presser bar of the machine, means for feeding the cloth past said attachment comprising a feed bar movably attached to the frame member and adapted for longitudinal and vertical movement, means to move said feed bar longitudinally of the frame including a rotatable cam member carried by the frame, a part secured to said feed bar and actuated by said cam member, and a pivoted element swingable into and out of position between said part and said cam member to vary the movement of the feed bar by the cam member.
1a. A hemstitching attachment for sewing machines comprising a frame member, a feed bar slidably connected to said frame member for longitudinal movement, means to move said feed bar longitudinally of the frame comprising a cam rotatably mounted on the frame, a lug secured to the feed bar, a lever pivoted on the frame having one arm engaging said cam memher and the other arm engaging said lug, and an element pivoted to said lug and movable into and out of position between the lever arm and said lug to vary the movement of the feed bar by the cam member.
15. A hemstitching attachment comprising a frame member adapted to be attached to the presser bar of a sewing machine, means carried by said frame to feed the material laterally and forwardly of the machine, a piercer member, and a carrier for said piercer member movably associated with the frame, said piercer member being movably secured to the carrier for movement to inoperative position.
16. A hemstitching attachment comprising a frame member adapted to be attached to the presser bar of a sewing machine, means carried by said frame to feed the material laterally and forwardly of the machine, a piercer member, acarrier for said piercer member movably associated with the frame, said piercer member being movably secured to the carrier for movement to inoperative position, and a stop on the carrier to limit the resetting of said piercer memher to its original position.
17. A hemstitching attachment comprising a frame member adapted to be attached to the presser bar of a sewing machine, means carried by said frame to feed the material laterally and forwardly of the machine, an arm pivoted to the former member, a piercer head carried by said arm, and a piercer member carried by said head, said piercer head being pivotally secured to said arm to swing the piercer to inoperative position.
18. A hemstitching attachment comprising a frame member adapted to be attached to the presser bar of a sewing machine, means carried by said frame to feed the material laterally and forwardly of the machine, an arm pivoted to the former member, a piercer head carried by said arm, a piercer member carried by said head, said piercer head being pivotally secured to said arm to. swing the piercer to inoperative position, and means on said arm engaging said head to limit the movement of the piercer when reset to its original position.
19. A hemstitching attachment comprising a frame, operating mechanism on said frame for moving the cloth laterally and forwardly and for piercing openings in the cloth, said mechanism including a shaft rotatably mounted in the frame and actuated from the needle bar of the sewing machine, said shaft having an enlarged portion at one end thereof presenting a shoulder, a ratchet wheel non-rotatably secured upon said end, a hub member lodged against said shoulder, a key upon said shoulder and said hub having a key way facing the shoulder in which the key is received.
20. A hemstitching attachment comprising a frame, a feed bar operatively connected to the frame for lateral and longitudinal movements relatively thereto, a piercer arm pivoted to the frame for vertical movement relatively thereto, and means connecting said piercer arm to said feed bar to positively move the former laterally with the latter in both directions, said means permitting vertical movement of the piercer arm independently of the feed bar.
21. A hemstitching attachment comprising a frame, a feed bar operatively connected to the frame for lateral and longitudinal movements relatively thereto, a piercer arm pivoted to the frame for vertical movement relatively thereto, and means connecting said piercer arm to said feed bar to move the former laterally with the latter in both directions, said means permitting vertical movement of the piercer arm independently of the feed bar, and said means comprising projections on said feed bar, one engaging each side of said piercer arm.
22. A hemstitching attachment comprising a frame, a feed bar operatively connected to the frame for lateral and longitudinal movements relatively thereto, a piercer arm pivoted to the frame for vertical movement relatively thereto, means connecting said piercer arm to said feed bar to move the former laterally with the laiter in both directions, said means permitting vertical movement of the piercer arm independently of the feed bar and said means comprising a depending finger on said piercer arm, and a slot provided in said feed bar into which said finger extends.
23. An L-shaped piercer member for hemstitching devices comprising a horizontal supporting portion and a vertical operating portion having a pointed end, said portions being disposed at an obtuse angle one to the other, and the taper of the point of said piercer being less on one side than on the other.
24. A hemstitching device having a piercer member, means for mounting said piercer member in said device at an angle slightly inclined to the vertical, said piercer member having a pointed end, and said point being eccentric to the axis of said piercer.
25. A hemstitching device having a piercer member, means for mounting said piercer member in said device at an angle slightly inclined to the vertical, said piercer member having a pointed end, and said point being nearer that side of said piercer making an acute angle with the horizontal than to the opposite side.
26. A hemstitching attachment adapted to be secured to the presser bar of a sewing machine, a throat plate adapted to cover the feeding dog of the sewing machine below said attachment:
said attachment having a piercer member, said throat plate having an opening for said piercer memberand an opening for the sewing machine needle, and said plate being provided with a depression in its upper surface forwardly and at one side of said needle opening.
27. A throat plate for use with a sewing machine hemstitching attachment having a piercer bar, said throat plate having a laterally elongated opening for the piercer, an L-shaped depression rearwardly of said opening, and a needle opening at the angle of said depression.
28. A throat plate for use with a sewing machine hemstitching attachment having a piercer bar, said throat plate having a laterally elongated opening for the piercer, a depression extending rearwardly from said opening, and a needle opening located in said depression.
29. A throat plate for use with a sewing machine hemstitching attachment having a piercer, said throat plate having an opening to receive the piercer, said opening being elongated transversely of the direction of travel of goods through the machine, and indicating means on said throat plate intermediate the ends of, and adjacent the edge of, said opening to mark the position of the piercer.
30. A hemstitching attachment for sewing machines comprising a frame adapted to be attached to the presser bar of the machine, an arm hinged to the frame, a piercer carried by said arm, means attached to said arm and extending into the path of movement of the needle bar of the sewing machine whereby the descent of the needle bar strikes said means and forces the piercer downwardly, spring means to cause said arm to follow the needle bar upon the upward stroke of the latter, and means having fixed position with respect to the path of movement of the armto limit the upward movement thereof.
31. A hemstitching attachment for sewing machines having a presser bar and a needle bar, said attachment comprising a frame adapted to be attached to the presser bar, an arm pivoted to said frame, a piercer secured to said arm, and means for effecting upward and downward movement of said arm in synchronism with the movement of the needle bar.
32. A hemstitching attachment for sewing machines having a needle bar and a presser bar, said attachment comprising a, frame adapted to be attached to the presser bar, a piercer arm pivotally secured to the frame and carrying a piercer adjacent one end thereof, means secured to said arm and extending in the path of the needle bar whereby the latter forces the piercer arm downwardly, means. to raise the piercer arm upwardly after each stroke of the needle bar and means having fixed position with respect to the path of movement of the arm to limit the upward movement thereof.
33. A hemstitching attachment for sewing machines comprising a frame, a presser foot carried by said frame, a piercing device movably mounted on the frame, said presser foot being provided with an opening to permit passage of the piercing device and sewing needle therethrough, and the portion of said opening adjacent the piercing device being enlarged laterally with respect to the remainder of said opening to permit lateral movement of the piercing device and provide support of the work by the edges of said opening closely adjacent said device.
34. A hemstitching attachment for sewing ma- GEORGE L. HINMAN. CLIFFORD J. WORD.
US759146A 1934-12-26 1934-12-26 Hemstitching attachment for sewing machines Expired - Lifetime US2069652A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512420A (en) * 1946-12-23 1950-06-20 Harry M Ellerkamp Reversible irrigation pump
US2553514A (en) * 1949-08-26 1951-05-15 Singer Mfg Co Hemstitching attachment for sewing machines
US2711705A (en) * 1951-04-21 1955-06-28 Greist Mfg Co Overcasting attachments
US2861528A (en) * 1955-09-13 1958-11-25 Singer Mfg Co Ornamental zigzag stitching attachments
US2948244A (en) * 1955-02-15 1960-08-09 Singer Mfg Co Feed cover-plates for sewing machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512420A (en) * 1946-12-23 1950-06-20 Harry M Ellerkamp Reversible irrigation pump
US2553514A (en) * 1949-08-26 1951-05-15 Singer Mfg Co Hemstitching attachment for sewing machines
US2711705A (en) * 1951-04-21 1955-06-28 Greist Mfg Co Overcasting attachments
US2948244A (en) * 1955-02-15 1960-08-09 Singer Mfg Co Feed cover-plates for sewing machines
US2861528A (en) * 1955-09-13 1958-11-25 Singer Mfg Co Ornamental zigzag stitching attachments

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