US2386800A - Sewing machine - Google Patents

Sewing machine Download PDF

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Publication number
US2386800A
US2386800A US355738A US35573840A US2386800A US 2386800 A US2386800 A US 2386800A US 355738 A US355738 A US 355738A US 35573840 A US35573840 A US 35573840A US 2386800 A US2386800 A US 2386800A
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United States
Prior art keywords
thread
needle
finger
arm
path
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US355738A
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English (en)
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Carl W Johnson
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AMF Inc
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AMF Inc
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Priority to FR956480D priority Critical patent/FR956480A/fr
Application filed by AMF Inc filed Critical AMF Inc
Priority to US355738A priority patent/US2386800A/en
Priority to US448189A priority patent/US2402251A/en
Application granted granted Critical
Publication of US2386800A publication Critical patent/US2386800A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
    • D05B1/02—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making single-thread seams
    • D05B1/04—Running-stitch seams
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B85/00—Needles
    • D05B85/003—Needles with two tips and an eye in the middle

Definitions

  • This invention relates to a sewing machine and more particularly to sewing machines of the under and over stitch type in which the ends of a double pointed needle are alternately grasped by needle bars and projected back and forth through the Work as it is moved into the range of action of the needle.
  • the invention relates generally to improvements in a machine of the type shown in my pending application, Serial No. 289,907, filed August 12, 1939, for Sewing machine, and has as its chief object the provision of improved co-, acting elements which Will increase the general eificiency of the sewing machine and its scope of use.
  • My invention also consists in the provision of improved driving mechanism which is localized in one general position to the rear of the machine so that there is more room available at the front of the machine for sewing instrumentalities and also the several driving gears employed are kept clear of lint and thread, thereby resulting in a more emcient and compact structure.
  • the thread is under tension at all times and properly positioned relative to the needle.
  • a further object of my invention is to provide a pair of improved gripper arms which will aid in proper positioning of the thread in the cutout portion around the periphery of a drum.
  • An additional object of my invention is to provide a simplified and more direct means for operating the needle chucks in timed relationship.
  • Another object of my invention is to provide a simplified, faster operating and smoother drive for a thread puller arm.
  • My invention also consists in an improved arrangement of the thread receiving drum which will allow additional room for the operators legs and hence adds to the general efiiciency in the operation of the machine.
  • Fig. 1 is a side view, partly in section, of a portion of the improved sewing machine
  • Fig. 2 is a front elevation, taken from line 22 of Fig. 1, the -handwheel and needle bar cam.
  • Fig. 3 is an enlarged detail view taken from line 3-3 of Fig. 1, showing the upper needle bar, the material feeding arm and its co-acting feed foot and presser foot;
  • Fig. 4 is a detail view illustrating the mounting of the looper' arm and tension finger as seen from line 44 of Fig. 3;
  • Fig; 5 is a detail view showing a portion of one its cam of the needle bars and the connection to actuated lever;
  • Fig. 6 is a detail view taken from line 6-6 of Fig. 5;
  • Fig. 7 is an enlarged sectional view of the improved needle bar in needle receiving position
  • Fig. 8 is a view of a needle bar, partly in section, showing a needle grasped by the needle bar chuck;
  • Fig. 9 is a partial sectional view of a part of the needle bar showing the needle as it is about Fig. 12 is a plan view of a portion of Fig. 11
  • Fig. 13 is a plan View of the improved threadguide used in conjunction with the thread tension mechanism
  • Fig. 14 is a side view of thesame taken fromv line
  • Figs. 15, 16 and 17 are detail views showing the different stages in sewing the. work
  • Fig. 18. is a plan view. taken from line
  • Fig. 19 is a plan view taken from line
  • Figure 20 is a. partial assembly view partly in section showing the relationship between the needle, needle actuating bars and other thread handling mechanisms.
  • Figure 21 is a diagrammatic perspective view showing the coaction between the needle bars, looper, and tension fingers during the operation of the latter.
  • the sewing machine which is of the same general type as that shown in copending application, Serial No..289 ,90'7, filed August 12', 1939, by Carl W. Johnson for Sewin machines, consistsfof a center support frame and a combination end frame and housing 3
  • the frame 39 supportsa bracket 34 carrying the forward end of, the sewing machine table" 35; the rear end of the sam'ebeing secured to spaced blocks 36 which are. fastened 'to the frame 3
  • a pulley31' is driven by" a belt 38 which also runs over a pulley (not shown) integral with a clutch mechanism driven from a motor (not shown) in the same manner as disclosed in the copending armlication referredto' above. Therefore, thedrive as well as the mechanism for operating the clutch and a brake isomitted in the present case.
  • Pulley 31 is secured to the hub" of a gear 4
  • a handwheel secured to pulley. 31 is provided to permit manual turning of the machine.
  • A- cam' 39 cooperates and rotates with pulley 31.
  • This cam may be formed as a separate member; or as in the present application, it may be formed integral with and on the inside face of pulley 31.
  • Cam 39 isprovided with a camtrack 45 engaging cam followers. 46. and 41. positioned. at diametrically opposite points of the cam, these followers being carried by the extending arm 48.and 49 at the rearward end of their respective oscillating 1e.- vers 50 .and 5
  • shafts. 52,.and. 53 are pivotally, mounted on shafts. 52,.and. 53, respectively, shaft 52 being supported at; one end in a. hub 54 of a bracket 55 secured to the wall of member 3
  • One end of shaft 53 is supp orted in a hub58 of a bracket 59 fastened to'the wall of member 3
  • An upper needle bar 63 and a lower needle bar 64 (Figs.
  • the actuator members 65 heretofore mentioned are held in place on their respective needle bars 63 and 64 by lock nuts as seen in Figs. 5 and 6.
  • the vertical extending. portion 16 oftrnembers 65 isprovided with a track "in which slides a rectangular block 18 inserted on the endofa studmfixed in the end of arms 66 and 61'.
  • the sliding block 18 permits means for converting the oscillating motion of arms 66 and 61 into a, vertical reciprocating motion of the needlebars 63 and 64.
  • the member 6513f the upper needlebar has an extension (Figs. 5 and 6) provided to perform an operation to be described presently.
  • Thismachine has a double pointed needle having a point at each end, and an eye about midway of; its length through which the thread passes.
  • This needle is used in conjunction with the improved needle bars 63-. and 64. Since both needle bars are constructed in th'e same manner, like reference numerals will be used to designate like parts, and only one will be described.
  • the upper needle bar 63.-as shown' may consist of an outer shell which at its upper end has a threaded portion receiving a plug 86, having an aperture 8,! slightly larger than the diameter of the operating rod 88.
  • Rod 88 at its lower end is provided withaplug portion 89; fitting into an aperture; 9B- of the inner shell 9
  • are guidedin aperture 81 0f the plug 86 and in the aperture 9.4 of: shell 85.
  • , at its lower end is provided with a.
  • seat- 95 adapted to serveas a stop for the base of the cageor ball retainer portion 96 0faslidable plug 91 guided in the. aperture 960 f shell 9
  • the plug 91 is normally held inthe position shown in Fig. 7, abut.- ting the; seat 95 by a eompressionspring 98.
  • the lowerportion of shell 85 is equipped with a stud 99, Fig, 9, the-same being held in place by a split wirering lllll fitting into an annular groove
  • the stud99 is provided with an opening [03 ⁇ formledto suit the point of the needle and serves to stop theneedles at the same position eachtime it is transferred from one needle bar to the other.
  • is -alternately grasped by the jaws of each needle bar.- The action is such that as the lower needle bar 64 advances the needle inwardly through the work, it passes through the opening I04 in the lower endof shell 9-
  • the upper and lower needle bars 63 and 64 are identical in construction and operate in the same manner for gripping and releasing the needle in projecting the same back and forth through the work so that the operation of only one needle bar need be described in detail.
  • comes to rest because of the engagement ofshock absorber III with a bushing 68.
  • shell 85 of the lower needle bar 64 connected to arm 6! continues its upward movement relative to the cage '96 of plug 91, then resting against stop portion 95 of shell 9
  • may be provided with grooves I08, Fig. 10, thereby providing better meansfor the balls I06 to properly obtain a firmer grip on the needle.
  • the oscillating lever 50 With the needle in position, the oscillating lever 50, previously mentioned, carries the shell 85 of the needle bar 63 upward, whereby the balls I06 become wedged between the needle 8
  • a spring III is confined in the aperture 94 of shell 85 and normally tends to hold a shock absorber III made of rubber or any other suitable material, which may be integral with a knurled nut M2 on rod 88, against the face of bushing 68.
  • the tension of spring I I0 is great enough to overcome the tension of spring 98 which therefore causes the latter to be compressed (Fig. 8) during the needle gripping and positioning operation heretofore mentioned.
  • the upper needle bar 63 descends as a unit until the shock absorber I I I abuts the face of bushing 68 and arrests the travel of rod 88 and its coacting shell 9
  • the shell 85 and plug 91 continue their downward travel and finally the base of the cage 96 abuts its seat 95 stopping the travel of plug 91 but the shell 85 continues downward slightly, as indicated by the dotted lines in Fig. '7, thus releasing the gripper balls I06 freeing the needle. It is understood that the needle has passed through the work and entered into the lower needle bar 64 and is being gripped by the latter in the manner that the upper needle bar accomplishes the same.
  • the nut II2, on rods 88, provides means for adjusting the gripping elements
  • nuts I I 2 are held in place by lock nuts I I3.
  • both shells 85 for a short distance travel in unison, that is one moves to release the needle and stops, while the opposing one grips the needle and continues its travel to carry the needle through the work.
  • Fig. 9a means are shown whereby the needle bars can easily and quickly be adapted to receive difierent size needles.
  • may be provided with a tapped hole 5 to receive a threaded insert or bushing II6 having an opening II! which is slightly larger than the diameter of the needle to be used. If a needle of larger or smaller diameter is desired, member H6 can b readily removed and replaced by a like member having an opening to accommodate the new needle.
  • the openings I05 in the cage 96 are large enough to accommodate the maximum size needle.
  • a presser foot I20 (Figs. 1 and 3), used in conjunction with a feeding foot
  • the presser foot I20 is clamped to the lower end of a rod I24 guided in the upper and lower lugs '10 of member II.
  • the upper end of rod I24 supports a bar I25 which is clamped between lock nuts I26 and supports one end of the tension springs I21 which connect to the upturned ends I28 of a-plate I29 fastened to the upper lug I0.
  • the springs I21 normally tend to hold foot I20 in work position and since the bar I25 can be moved up and down on the rod I24, the tension of the springs I2! can be adjusted so as to exert the desired pressure of the foot to suit different types of work.
  • a block I35 which is clamped on rod I24 supports one end of a link I3I connecting to a lever I32 loosely mounted on a stud I33 carried by an arm I 34 which in turn is fastened to the bar portion I35 of a rod I 36.
  • the vertical extending arm of lever I32 supports an arm I31 connecting to a crank I38 of a rotating shaft I39 whereby an up and down motion is imparted to the presser foot I20 and the feeding foot
  • rod I36 The upper end of rod I36 is guided in a swivel block I46 and may be equipped with trunnions
  • Bar portion I35 of rod I 36 is guided in a slot I45 provided in the lower lug E0 of member II, said lug also having tapped holes I46 to receive screws which hold a guide plate (not shown) in place.
  • a plate I47 attached to the lugs I0, is provided with an elongated slot I48 which guides the movement of the arm I34.
  • Shaft I39 (Figs. 1, 2 and 3) is rotated by a gear I50 in mesh with an intermediate gear I 5
  • is mounted on a stud I52 supported by the end wall of housing 3
  • 2I are so arranged that they may be lifted whenever the operator desires.
  • This feature is accomplished by providing a knee plate I53 (Fig. l) which is adjustably fastened to a rod I 54 by a thumb screw I 55, the upper end of rod I54 connecting to a head I56 clamped to a cross shaft I57.
  • Shaft I5! at one end is pivotally mounted in a. bearing of: support. 32 audits. other end ,mounted-in a bearing of a. bracket I581 fastenedtothesupport 62'.
  • Anarmi I59; isfixed toshaft I51, and coacts. with a. bar I60 slidable.
  • a looper cam I10 (Figs. 1 and 2) engages a cam.
  • roller I1I which is mounted ona stud I12 carried by a lever I13 fastenedon a cross shaft I14.
  • the cam roller I1I is held in engagement with cam I10 by means of a spring I15 which is stretched between a post I16 in lever I13 and a post I11 in a lug I18 extending from housing 3!.
  • Shaft I14 at one end is supported by housing 3
  • a looper arm I8I (Figs. 3 and 4) secured to shaft I14 at its lower end is provided with a pointed finger I82 and a thread guide roller I83 which, together with a tension finger I84 act upon the thread in a manner hereinafter to be.
  • the finger I84 is secured. to an arm I 85 loosely mounted on shaft I14, the hub of arm I85 being mounted between fibre washers I86 serving to maintain frictional contact with looper arm I8I, the frictional means being maintained by the pressure of a compression spring I81 placed between a collar I88 fastened to shaft I-14 and a collar I89 loose on the shaft.
  • the finger I84 is normally heldinoperative by a stop screw I90'adapted to engage a pin I9'I projecting from arm I85, screw I90 being adjustably fastened in a wing I92 of a holder I93 fastened to 1
  • the needle bar then descends slightly and dwells and in so doing a loop is formed in the thread and substantially simultaneously arm I8I and finger I04 advance in unison, and arm I81 engages the front loop of the thread while finger I84 engages the rear loop of the thread, both members continue advancing and pulling the thread, for reasons to be described hereinafter.
  • the advance of finger I84 is stopped when pin I9I abuts the wing I94 of holder I93, while arm.
  • looper IBI, and finger I84v retain their positions until the needle is again transferred to the upper needlebar- With needle 8I' grippedv in the lower needle bar 6.4; it descends by'meansof its camactuated lever 5-I to down position at the same time pulling the thread partly through the. work, whereupon it immediately ascends slightly and. dwells, this slight upward. movement tending to form a loop in the thread.
  • a pair of cam actuated gripper arms 200 and 20I (Figs. 11, 13 and 14) close around the needle and the looped portion of the thread to prevent unnecessary pulling of the stitch as a, thread puller 202' enters the front loop of the thread and starts to completely pull the free end of the thread through the work as seen in Figs. 15 and 18.
  • the gripper arms 200 and 20I are operated by acam 203adjustab1y attached to a cam 204secured to a shaft 205.
  • Cam 203 (Figs. 1 and 11) has a cam track I99 engaging a cam follower 206 of a cam lever 201 mounted on a stud 208 carried by a holder 209 fastened on a support 2'I0. attached to frame 30.
  • the upper end of cam lever 201 is provided with an open end slot 2iI'I' adapted to engage a pin 2 I2 in a bar 2I3 sliding in a runway 2I4 of a block 2I5 secured to member 62'. Since the bar 2I3- operates the gripper arms 200 and 20I in the same manner as in the co-pending application heretofore referred to, a more detailed showing of the same is deemed unnecessary.
  • the bar 2 I 3 when moved in one direction causes the arms 200and 20I to close about the needle BI and the looped portion of the thread and retain this position while the thread puller 202 engages the thread and advances it about the periphery of a drum.
  • arms 200 and 20I return to their open position permitting thelower needle bar 64 to be moved upward.
  • the cam 204 is provided with a flange H6 and a shoulder 2I1 slightly smaller in diameter, adapted to receive the cam 203, said cam 204 also having at its end another flange 2I8 and shoulder 2I9't0 receive a cam 220.
  • the cam shaft 205 is-supported at one end thereof in a bearing 222 of housing 31 (Fig. 1) and its other end in a bearing 223 of a stationary drum 224 secured to supports 225' attached to frame 30 as seen in Figs. 1 and 11.
  • Shaft 205 is equipped with a gear 226 in mesh with an intermediate gear 221, mounted on a stud 228 supported by the wall of housing 3I (Figs. 1 and 2), which in turn is driven by the main gear 4
  • the gear 226 drives an intermediate gear 229 mounted on a stud 230 which meshes with a gear 23I integral with a gear 232 mounted on a stud" 233 which is supported in a bearing 234 of housing 3I;
  • Gear 232 drives a gear 235 (Fig. 2)
  • the puller 202 does not act with such quickness in starting the pull of the thread through the work with a tendency to fray out the thread after a number of pulls or with a tendency to jerk and break the same but after the pull is started, the puller gradually increases speed when danger of thread breakage is past.
  • the action of the thread puller therefore, is to pull the loose end of the thread through the work with gradually increasing speed from approximately the time it first picks up the thread until it approaches the pick-up position, whereupon its advancing facility is gradually retarded.
  • a finger 241 Coacting with the thread puller, needle and needle bars, and acting to tension the thread properly and also prevent fouling of the thread or splitting by the needle, is a finger 241 (Fig. 13) which in the illustrated embodiment is provided with a hook at its free end and engaging and pulling the thread out of the path of the needle as it moves back and forth through the work. At the time of transfer of the needle from one needle bar to the other, the thread is held out of the position of the needle so that the thread is always clear of the needle and properly tensioned.
  • cams 248 and 249 (Fig. 12) secured to a vertical shaft 250 supported in a hub 25l of a bracket 252 fastened to th drum 224 (Fig. 1).
  • the lower end of shaft 258 is equipped with a spiral gear 253 in mesh with a spiral gear 254 fixed on the cam shaft 205 (Figs. 1 and 11).
  • Cam 248 (Fig. 12) engages a cam follower 2550f an arm 256 loosely mounted on a stud 251 carried by a lug 258 of bracket 252, the other end of arm 256 supporting a link 259 connecting to an arm 26!] which is attached to the lower end of a stud 26l (Fig. 11) loosely mounted in a hub 262 of a lever 263.
  • the stud 26! terminates in a head 264 in which is adjustably clamped the finger 241 receiving oscillating motion from link 259 having an elongated slot 265 in which moves a stud 266 on arm 260.
  • An adjusting screw 321 permits the finger 241 to be set in any desired position in order to engage the thread properly.
  • a spring 261 is connected to arm 26D and has its other end attached to an adjustable rod 325 which allows spring 261 to be tightened or loosened by turning nut 326 located at the end of said rod for varying the amount of tension to be applied by finger 241.
  • Stud 266 is normally held by spring 261 in the position shown in Fig. 12 but can travel in slot 265 in order to tension the thread or prevent damage to the machine should any obstruction appear. Should spring 261 break or be rendered inoperative for any reason which might cause finger 241 to be located in the path of needle 8
  • the cam 249 engages a cam roller 268 of an arm 269 which is integral with lever 263 loosely mounted on a stud 210 carried by lug 258, this cam importing somewhat of a closed or four-motion path of movement of the tension finger 241.
  • a tension spring 211 stretched between posts 212 and 213 carried by lever 263 and arm 256, respectively, is provided to hold the cam followers 255 and 268 in engagement with their cam.
  • the finger 241 operates in conjunction with a guide plate 215 fastened to a throat plate 216 (Figs. 13 and 14) guide plate 215 being, provided with an opening 211 which is shaped more or less like a key slot.
  • the opening'211 tends to guide the thread within the path of the finger 241 which may describe a path of movement corresponding somewhat to the contour of the opening. andinso doing the hooked end of the finger. 241. moves to engage the thread and pull the same laterally to one side of the needle thereby moving it out of the needle path, and holding the thread in that position, while the needle reciprocates, and then moves back to re-engage the thread on the next stitch.
  • the throat plate 216 is attached at its forward end to bracket 34 andits opposite end. is supported by a spacer 218 (Fig. 1) carried by member 2I5. Plate 216 is provided with a fill-in plate 219 (Fig. 13) and two similar plates (not shown) which are provided with slots to permit movement of the material feed members and also movement of the thread. The above mentioned plates are omitted in order to more clearly show the feed members I21 and 122 and the guide plate 215.
  • the cam 204 (Fig. 11) is provided with a cam track 280 engaging a cam roller 28! of a trip arm 282 mounted ona stud 283 carried by a lug 284 of member 215.
  • the upper end of arm 282 engages the end of a plug 285 which is secured to the end of a spring tensioned rod 286 which terminates in a member 281-having a vertical eX- tending jaw portion 288.
  • the pointed part 289 of a swinging arm 290 together with jaw portion 288 form a jaw adapted to clamp the thread and later carry the same upward to fulfill a duty presently to be described.
  • the plug 285 and rod 286 slide in suitable apertures provided in arm 290 and aspring 291 confined in the aperture of the arm tending to normally hold the plug 285 against the end of arm 282.
  • the swinging motion of arm 298 is accomplished by cam 220 having a cam track 292 engaging a cam roller 293 of a cam lever 294 loosely mounted on a stud 295 carried by a lug 296 (Fig. 1) of member 62.
  • Lever 294 at its upper end supports a head 291 (Fig. 11) carrying a rod 298 connecting to a depending arm 299 of arm 290 which is mounted on a stud 369 carried by member 215. 4
  • the puller As the puller advances it positions the thread B in a groove 3I0 of member 309 and continues moving and completely pulls the free end F through the work at which time the arms 200 and 20I open, permitting the lower needle bar 64 to ascent.
  • the operation of the thread puller is similar to that in my above referred to application in that it moves at a slow speed into engagement with the looped thread in order not to break the thread, then accelerates and moves more rapidly to complete the operation of pulling the loose end of the thread through the work.
  • the clamped jaws 288 and 289 swing upwardly in unison with the ascent of the needle bar 64 and in so doing the thread A is caused to enterinto a. trap 3II of the stationary guide member 306 (Fig. 11), the finger 241 (Figs. 11 and 13) engaging the thread and pulling it out of the path of the needle and holding it there until the upper needle bar ascends.
  • jaws 288 and 289 cause the thread A to be moved from shelf 30'I laterally and disposed in trap .3 in a manner similar to that set forth in my copending applicationmentioned above.
  • the needle grasped bythe upper needle bar 63 With the needle grasped bythe upper needle bar 63, the same ascends its full stroke and immediately descends slightly forming a loop in the thread and dwells.
  • the jaw 288 and 289 open, permitting the needle to pull a portion of the free end of the thread through slot .3I4.
  • the arm I8I and finger I84 now move inwardly in unison and the finger I82 of arm I 8.! engages the front thread F of the loop and pulls the thread through slot 3I4. the arm advancing to a position shown in Fig.
  • the feed arm I22 and feed foot I2I advance the work one stitch length.
  • the presser foot I20 at such time is raised sufiiciently to permit the work to be moved, when the material feed reaches the end of its stroke the presser foot descends clamping the work against the work table and the arm I22 descends slightly and returns to its starting position at which time it is again raised to engage the work.
  • the feed foot I2I is advanced b the material feed arm I22 and when the latter descends, the feed foot, by means of its mechanism heretofore described, is raised permitting a spring actuated arm 3I6 (Fig. 3) to return it to the starting position.
  • Arm 3I6 is loosely mounted on a stud 3I'I carried by a lug 3I8 extending from bridge 51, a spring 3I9 coiled about the hub of arm 3I6 having one end arrested in a hole in lug 3I8 and its other end passing through a hole provided in the arm.
  • the combination with alternately moving needle bars, of a needle means for alternately connecting said needle with said bars for projection with a thread through work to be sewed, means for moving the thread out of the path of movement of said needle including a finger arranged to engage said thread, a support for said finger, and means for moving said support to move said finger in a substantially closed path substantially at right angles across the path of movement of said needle into and out of thread engaging position.
  • a tensioning device for preventing fouling of the thread by the needle, comprising a support, a finger mounted on said support. mechanism for moving said support to move said finger in a closed continuous path into engagement with the thread to tension it in the work, in-
  • a thread tensioning device for a sewing machine comprising a table, a thread guide formed in said table, a traveling support mounted beneath said table and guide, a finger mounted on said support and arranged to engage said thread, and means for moving said support to move said finger relative to said guide in a closed path to tension said thread and maintain it out of the path of a needle.
  • a thread tensioning device for a sewing machine having opposed needle bars and a needle which is projected back and forth with a thread through material to be sewed comprising a support, a shaft mounting said support, a tension finger carried by said support, and projectable into position to engage said thread, a support actuating arm, a finger actuating lever, a second finger actuating lever, a link connecting said levers, and cams coacting with said arm and said levers for moving said finger in a closed path into and out of thread engagement.
  • a needle bar carrying a needle and thread for sewing, a work table having a thread guide formed in said table, and provided with an irregular opening, a tension finger located beneath said table, and means for moving said finger in a closed path conforming to the shape of said guide opening for tensioning and holding the thread out of the path of said needle.
  • a needle bar carrying a needle and a thread for sewing, a work table having an irregularly shaped thread guide formed therein, a tension finger located below said table and projecting into position adjacent said guide to engage said thread, and means for moving said finger to engage said thread to tension the same and move said thread in said opening out of the path of said needle.
  • a sewing machine having a needle bar holding a needle and a thread for sewing, a work table having a thread guide provided with an opening formed therein, a tension finger provided with a thread engaging point located to engage said thread, means for mounting said finger for translatory movement of said thread conforming substantially to the shape of said opening in said guide, and means for maintaining said finger stationary during a part of each sewing cycle of said machine to position said thread out of the path of said needle.
  • a sewing machine having a needle bar holding a needle and a thread for sewing, a ten sion finger provided with a thread engaging point located to engage said thread, means for mounting said finger for translatory thread engaging movement, and means for maintaining said finger stationary during a part of each sewing cycle of said machine to position said thread out of the path of said needle, said last-named means including means for moving said finger to free said thread from engagement with said finger.
  • a thread displacing finger In a sewing machine having a vertical operating needle and a work table, a thread displacing finger, and means for moving said finger in a substantially horizontal plane and in a closed path beneath said table to maintain a thread clear of the needle and to tension the thread during formation of the stitches.
  • a member movable m a substantially horizontal plane into and out of engagement with said thread, and mechanism for moving said member across the path of travel of said needle to pull said thread to tension it relative to the material and to hold it out of the path of said needle each time said needle is passed through the work.
  • a work table arranged to support material to be sewed, said table being provided with a thread guide, a member located beneath said table and movable in substantially a horizontal plane for engaging said thread, and means for driving said member in timed relation to the movement of said needle to pull said thread laterally within the limits of said guide and maintain said thread out of the path of said needle during its movement through the Work.
  • a yieldingly mounted thread guiding and tensioning device constructed to engage said thread, means for moving said device into engagement with said thread and for translating said thread after engagement therewith out of the path of movement of said needle and maintaining it clear of said needle, mechanism coacting with said device for properly tensioning said thread, and means for adjusting said mechanism to control the tension exerted thereby within given limits.
  • a yieldingly mounted thread guiding and tensioning device constructed to engage said thread, means for moving said device into engagement with said thread and for translating said thread after engagement therewith out of the path of movement of said needle and maintaining itclear of said needle, mechanism coacting with said device for properly tensioning said thread, and means for adjusting said mechanism to control the tension exerted thereby within given limits, said means including a spring actively associated with said device, a control member connected to said spring, and means for moving the control member relative to said spring to vary the tension exerted by said spring on said device.
  • a thread guiding and tensioning device In a sewin machine having opposed needle chucks and a double pointed needle projected back and forth with a thread through material to be sewed, a thread guiding and tensioning device, and means for moving said device at regular intervals in a closed path, part of said path passing through the range of movement of the needle for holding the thread clear of the needle and tensioning said thread.
  • a thread guiding and tensioning device In a sewing machine having opposed needle chucks and a double pointed needle projected back and forth with a thread through material to be sewed, a thread guiding and tensioning device, means for moving said device at regular intervals in a closed path, part of said path passing through the range of movement of the needle for holding the thread clear of the needle and tensioning said thread, and means for varying the position of said device relative to the thread to be engaged thereby.
  • thread guiding and tensioning device means for moving said device at regular intervals ina closed unidirectional :path, part of said path passing through the range of movement of the needlefor holding the thread clear of the needle and for tensioning the thread.
  • said needle bar being located so as to move a needle in a path disposed to one side of the vertical plane passing through the center of said drum, a thread gripping 'member positioned adjacent saidneedle bar, and a thread guide formed adjacent the end of said gripping member.
  • a needle bar carrying .a'needle and a thread'for sewing the combination with a pair of gripper arms located adjacent said needle bar, one of said arms being provided with a cut-away portion,imeans for operatingsaid arms to grip the needle and thread at'the conclusion of the stitchingcycle, and means for pulling the loose end of said thread past said cutaway portion.
  • a thread receiving drum-and a thread puller comprising;- a thread pullingmember, a shaft, an arm mounting said :thread-puller fixed to said shaft, '3, crank arm mounted on said shaft, a roller mounted on said crank arm, a thread puller driving member, a
  • thread being projected through material by a needle in forming over and under'stitches which comprises moving said portion of said thread laterally beneath said material and at substantially right angles across the path of said needle to dispose said portion of said thread out of the path of movement of said needle, and positively holding said portion of said thread out of the path of said needle while said needle isbeing projected through said material to form a stitch.
  • the method of controlling a thread being projected in one 'plan'eback and forth through material to be sewed in forming over and under stitches comprising engaging thethread beneath said material in a direction normal to said plane, moving said thread laterally beneath said material'in a substantially horizontal plane to a positionout of the path of movement of said needle and remote from the position where 'it wasfirst engaged, holdingsaid thre'adbeneath s'aid material at said remotepositionduring a partial forming of a stitch, and then releasing said thread.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US355738A 1940-09-07 1940-09-07 Sewing machine Expired - Lifetime US2386800A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR956480D FR956480A (enrdf_load_stackoverflow) 1940-09-07
US355738A US2386800A (en) 1940-09-07 1940-09-07 Sewing machine
US448189A US2402251A (en) 1940-09-07 1942-06-24 Sewing machine needle bar mechanism

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US355738A US2386800A (en) 1940-09-07 1940-09-07 Sewing machine

Publications (1)

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US2386800A true US2386800A (en) 1945-10-16

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Application Number Title Priority Date Filing Date
US355738A Expired - Lifetime US2386800A (en) 1940-09-07 1940-09-07 Sewing machine

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US (1) US2386800A (enrdf_load_stackoverflow)
FR (1) FR956480A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565320A (en) * 1948-04-10 1951-08-21 American Mach & Foundry Stitch handling mechanism for sewing machines
US2900939A (en) * 1956-05-07 1959-08-25 American Mach & Foundry Sewing machine looper mechanism
US2941485A (en) * 1956-03-15 1960-06-21 American Mach & Foundry Special stitch forming machine
US2941486A (en) * 1956-03-13 1960-06-21 American Mach & Foundry Machine for simulating hand overedge stitches
US2949084A (en) * 1956-05-07 1960-08-16 American Mach & Foundry Sewing machine looper mechanism
US3009431A (en) * 1957-11-29 1961-11-21 American Mach & Foundry Decorative stitch forming machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565320A (en) * 1948-04-10 1951-08-21 American Mach & Foundry Stitch handling mechanism for sewing machines
US2941486A (en) * 1956-03-13 1960-06-21 American Mach & Foundry Machine for simulating hand overedge stitches
US2941485A (en) * 1956-03-15 1960-06-21 American Mach & Foundry Special stitch forming machine
US2900939A (en) * 1956-05-07 1959-08-25 American Mach & Foundry Sewing machine looper mechanism
US2949084A (en) * 1956-05-07 1960-08-16 American Mach & Foundry Sewing machine looper mechanism
US3009431A (en) * 1957-11-29 1961-11-21 American Mach & Foundry Decorative stitch forming machine

Also Published As

Publication number Publication date
FR956480A (enrdf_load_stackoverflow) 1950-02-02

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