US2976831A - Sewing machines - Google Patents

Sewing machines Download PDF

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Publication number
US2976831A
US2976831A US609836A US60983656A US2976831A US 2976831 A US2976831 A US 2976831A US 609836 A US609836 A US 609836A US 60983656 A US60983656 A US 60983656A US 2976831 A US2976831 A US 2976831A
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Prior art keywords
looper
plate
bed
bar
sewing machines
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US609836A
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Hacklander Hans
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Singer Co
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Singer Co
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Priority to US609836A priority Critical patent/US2976831A/en
Priority to GB33198/58A priority patent/GB839233A/en
Priority to US693927A priority patent/US2974617A/en
Priority to US694682A priority patent/US2902959A/en
Priority to US73418A priority patent/US3016851A/en
Application granted granted Critical
Publication of US2976831A publication Critical patent/US2976831A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B71/00—Lubricating or cooling devices

Definitions

  • the present invention relates to sewing machines and particularly to high speed automatically lubricated industrial sewing machines which operate at speeds up wardly of 5000 stitches per minute, and at such speeds, will form perfect stitching, will be eflicient and durable and quieter and vibration free, and which also will be neat and attractive.
  • One of the principal objects of this invention is to provide a sewing machine in which a single basic machine is designed to be conveniently modified and/or fitted with various attachment mechanisms to adapt the machine for a large number of different specific sewing operations. Accordingly, it is an object of this invention to provide a new and improved universal attachment drive mechanism which can be used to actuate any one of a number of specific attachment mechanisms, 'which drive mechanism will be eificient and durable when used to drive any selected one of the various attachment mechanisms, and which drive mechanism is designed into the machine, for purpose of appearance as well as safety, in combination with a bracket-arm that is angled relative to the bed to improve visibility at the point of stitch formation and a needle-bar actuating rock lever arranged in an optimum manner longitudinally of the bracket-arm.
  • Fig. 1 is a front elevational view of a sewing machine embodying the present invention, partly broken away and in section.
  • Fig. 2 is a top plan view of the sewing machine of Fig. 1 with the top cover plate removed.
  • Fig. 3 is a head end elevation view of the sewing machine of Fig. 1 with the face plate removed.
  • Fig. 4 is a vertical sectional view longitudinally of the sewing machine of Fig. 1.
  • Fig. 5 is a horizontal sectional view of the sewing machine of Fig. 1 with the cloth plate and its supporting bracket and the bed cover plate removed.
  • Fig. 6 is a fragmentary detail view in elevation of g a modification of the looper drive crank.
  • Fig. 7 is a fragmentary horizontal sectional view taken substantially on the line 77 of Fig. 4 and illustrating the modified looper drive crank of Fig. 6.
  • Fig. 8 is a horizontal sectional View through the bracketarm ofthe sewing machine illustrated in Fig. 1.
  • Fig. 9 is a vertical sectional view through the standard of the sewing machine illustrated in Fig. 1 andtaken substantially on the line 9-9 of Fig. 4. p I
  • Fig. 10 is a sectional view taken substantially on the line 10-10 of Fig. 5.
  • Fig. 1 1 is a fragmentary sectional view taken substantially on the line 11-11 of Fig. 10.
  • Fig. 12 is a fragmentary detail sectional view of the feed-dog mounting taken substantially on the line 12-12 of Fig. 10.
  • Fig. 13 is a fragmentary elevational view of the needle thread tension device of the machine illustrated in Fig. 1.
  • Fig. 14 is a view similar to Fig. 13 but illustrating the parts in a different position.
  • Fig. 15 is a sectional view taken substantially on the line 15-15 of Fig. 14.
  • Fig. 16 is a fragmentary plan view of the bed of the machine illustrated in Fig. l, with the cloth plate removed, showing the looper thread take-up mechanism.
  • Fig. 17 is an enlarged fragmentary sectional view taken substantially on the line 17-17 of Fig. 16.
  • Figs. 18, 19 and 20 are sectional views similar to Fig. 17 but illustrating the parts in different positions of operation.
  • Fig. 21 is a fragmentary plan view of the bed with the cloth plate and the supporting bracket removed and illustrating a diiferential feeding mechanism in place of the plain feeding mechanism of Fig. 1.
  • Fig. 22 is a sectional view taken substantially on the line 22-22 of Fig. 21.
  • Fig. 23 is a fragmentary detail sectional view taken substantially on the line 23-23 of Fig. 22.
  • Fig. 24 is a rear elevational view, partly broken away, of the mechanism illustrated in Fig. 21.
  • Fig. 25 is a fragmentary detail sectional view taken substantially on the line 25-25 of Fig. 21.
  • Fig. 26 is a fragmentary vertical sectional view longitudinally of the machine of Fig. 1 and illustrating an alternating presser mechanism applied thereto.
  • Fig. 27 is a horizontal sectional view taken substantially on the line 27-27 of Fig. 26;
  • Fig. 28 is a fragmentary horizontal sectional view on an enlarged scale of the head end of the machine as illustrated in Fig. 27.
  • Fig. 29 is a fragmentary head end elevational view of the alternating presser mechanism as illustrated in Fig. 27.
  • Fig. 30 is a sectional view taken on the line 30-30 of Fig. 28.
  • Fig. 31 is a detail sectional view taken substantially on the line 3131 of Fig. 16.
  • Fig. 32 is a detail view in elevation of a portion of the looper thread take-up mechanism.
  • Fig. 33 is a fragmentary sectional view taken substantially on the line 33-33 of Fig. 16.
  • Fig. 34 is a head end elevational view of the sewing machine of Fig. l and illustrating a close coupled top puller feed mechanism applied thereto.
  • Fig. 35 is a fragmentary rear elevational view of the head of the sewing machine illustrated in Fig. 34.
  • Fig. 36 is a detail sectional view taken substantially on the line 36-36 of Fig. 35.
  • Fig. 37 is a detail sectional view taken substantially on the line 3737 of Fig. 35.
  • FIG. 1 there is illustrated a sewing machine having a bed 1 from one end of which rises a vertical hollow standard 2 that carries a hollow bracket-arm 3 terminating in a head *4.
  • the top of the bracket-arm 3 is open to provide access to the mechanism therein and is adapted to be closed by a cover plate 5.
  • a face plate 6 is provided to close the open end of the head 4.
  • the bed 1 is divided by a transverse vertical wall 7 upstanding from a bottom wall 8 into a closed splash-lubricated compartment 9, which is to the right of the wall 7 in Fig. 4, and a space 10 outside the closed compartment 9 for accommodating the lower feed and looper mechanisms of the machine.
  • the closed splash-lubricated compartment is surrounded by a front wall 11, a rear wall 12, and an end wall 13;
  • a standard section 14 that portion of the com.- partment 9 which is below the standard 2
  • the remainder of the compartment 9 is referred to as a bed section 15.
  • the standard section 14 of the bed compartment 9 is open at the bottom for access and is normally closed by an oil-tight gasketed plate 14a secured in place by screws 14b.
  • the standard section 14 is also open at the top within the confines of the standard 2 and thus communicates with the hollow interior of the standard 2.
  • the bed section 15 is open-at the top and is closed by a gasketed oil-tight cover plate 16.
  • a work-supporting cloth plate 17 extends over the bed section 15 and the space 10 and is mounted on the cover plate 16 and, above the space 10, is supported by a bracket 18. Fig.
  • the bracket 18 supports the throat plate 23 and for this purpose is provided with two threaded apertures 24 for receiving throat plate fastening screws 25.
  • the cloth plate 17 is provided with an aperture 26 to accommodate the throat plate 23 and a pair of plates 27 and 28.
  • the plate 27 is removably secured in place by a snap connector comprising a resilient spring wire clip 29, Figs. 16 and 31, secured to the underside of the bracket 18 and cooperating with a necked portion on.
  • a stud 30 that extends downwardly from the plate 27 and through a hole 31 in the bracket 18. Removal of the plate 27 is facilitated by a finger hole 32, Fig. 2.
  • the plate 28 is also adapted to be secured in place by a pair of snap fasteners similar to the one for the plate 27 and including spring wire clips 33 and 34, the clip 33 being secured to the underside of the cloth plate 17 and the clip 34 being secured to the underside of the bracket 18.
  • a short, transverse upstanding bearing boss 35 Disposed between the bed section 15 and the standard section 14 is a short, transverse upstanding bearing boss 35, Fig. 4.
  • the main shaft 36 of the machine is arranged longitudinally of the bed 1 in a bearing bushing 37 in the boss 35 and in a bearing bushing 38 carried by an insert 39 in the end wall 13.
  • Mounted upon the exposed end of the main shaft 36 is a combined hand wheel and belt pulley 40, Fig. l, which is hollow to receive a counterweight 41 and is closed by a cover plate 42.
  • the standard 2 is mounted to the rear of the bed 1 and rises vertically therefrom with the hollow interior of the standard open to the interior of the standard section 14 of the bed compartment 9.
  • the bracket-arm 3 which is mounted upon the top of the standard 2 extends diagonally across the bed, or in other words, is angled forwardly relative to the bed 1 and main shaft 36 so that the head 4 is disposed adjacent to the front of the machine. This arrangement places the point of stitch formation very close to the front of the machine and thereby increases the visibility of the operator and facilitates manipulation of the work. It is also many times necessary for the operator to reach behind the head for manipulation or handling of the work which is facilitated by having the head 4 arranged forwardly of the standard 2.
  • the standard 2 has a cutaway portion 43, Figs. 1 and 3. located at the front corner adjacent to the working surface of the machine.
  • the angled arm is also advantageous in the combination thereof in the present machine with a stepped or offset needle-bar drive rock lever and a pair of attachment drive shafts journaled in the bracketarm, as hereinafter discussed.
  • the needle mechanism of the present machine is best shown in Figs. 3, 4, 8 and 9, and comprises a needle-bar 44 mounted for endwise reciprocation in bearing bushings 45 and 46 in the head 4.
  • the illustrated machine is adapted to sew a double seam, i.e., two two-thread chain stitch lines of stitches, so there is secured to the lower end of the needle bar 44, by a needle clamp 47, a pair of needles 48.
  • the take-up arm 50 extends through a slot 51 in the head 4 and is provided with two thread eyes 52.
  • the collar 49 is also provided with an arm 53 that is connected by a pivoted link 54 to one arm 55 of a needle-bar drive rock lever, designated generally at 56, which is arranged longitudinally of the bracket-arm 3.
  • the rock lever 56 includes a hub 57 and a second arm 58 extending from the hub 57 in the opposite direction from the arm 55.
  • the hub 57 has a bore that receives a pivot shaft 59 journaled for oscillation on a horizontal axis transversely of the bracket-arm 3 in bearing bushings 60 and 61.
  • the free end of the arm 58 is secured to a connecting rod 62 by a ball and socket joint including a ball 63 upon the end of a stud 64 that is secured in a longitudinal bore in the end of the arm 58 and a twopart socket including a separable element 65.
  • the lower end of the connecting rod 62 has a two-part strap including a separable element 66, which strap surrounds a crank 67 formed on the main shaft 36 and having counterbalances 68.
  • the assembly openings in the bracket-arm 3 for the pivot shaft 59 are closed at the front by a plate 69 and at the rear by a plate 70 having a stud 71 with a threaded end and upon which a sewing light (not shown) is adapted to be secured.
  • looper mechanism The herein described looper mechanism has been divided from this application and now forms the subject matter of divisional application Serial No. 734,182, filed May 9, 1958.
  • the looper mechanism of the present machine is disclosed in Figs. 4, 5 and and comprises a looper bar 72 disposed in the space 10 in the bed 1 and mounted for oscillation and for axial sliding movement in a direction parallel to the axis of the main shaft 36 in a bearing bushing 73 carried by a boss 74 extending upwardly from the bottom plate 8 of the bed and a bearing bushing 75 carried by the wall 7.
  • a looper carrier 76 is mounted on the looper bar 72 by means of a split-ring connection having a clamping screw 77.
  • a pair of straight-line type threaded chain stitch loopers 78 are mounted on the looper carrier 76, the loopers having cylindrical shanks 79 that are received within vertical bores in the looper carrier 76 and locked in adjusted position by set screws 80.
  • Each of the loopers 78 is adapted to cooperate individually with one of the needles 48 in the formation of a two thread chain stitch line of stitching, axial reciprocation of the looper bar 72 imparting loop-seizing or advance and loop-shedding or return motions to the loopers 78, and oscillation of the looper bar 72 imparting the loop-spreading or needleavoiding motions to the loopers.
  • the loopers are universally adjustable to obtain the desired setting relative to the needles 48 in that the looper carrier 76 can be adjusted axially and angularly of the looper bar 72 and the shanks 79 of the loopers 78 can be adjusted axially and angularly relative to the looper carrier 76.
  • the looper bar 72 extends through the bearing 75 into the bed section of the closed bed compartment 9 and the end thereof is secured by a universal joint 81 to one end of a connecting rod 82.
  • the universal joint 81 comprises a yoke 83 on the end of the looper bar 72, the yoke being apertured to receive pivotally a pin 84.
  • Mounted on the pin 84 between the arms of the yoke 83 and secured thereto by a set screw 85 is a sleeve 86 having integral therewith a yoke 87 apertured transversely to the axis of the sleeve 86 to receive pivotally a pin 88.
  • Mounted on the pin 88 between the arms of the yoke 87 and secured thereto by a set screw 89 is a sleeve 90 formed upon the end of the connecting rod 82.
  • the opposite end of the connecting rod 82 is secured by a universal joint 91 to a crank pin 92, the universal joint 91 comprising a sleeve 93 mounted upon and secured by a set screw 94 to a pin 95 that is pivotally mounted in the arms of a yoke 96 having integral therewith a hub or sleeve 97 that is in turn pivotally mounted upon the crank pin 92.
  • the sleeve 97 is held on the crank pin 92 by a screw 98.
  • the drive for the looper mechanism comprises a bevel gear 99 secured upon the end of the main shaft 36 which extends through the bearing bushing 37 into the bed section 15 of the closed bed compartment 9.
  • the gear 99 meshes with a similar gear 100 on a looper drive shaft 101 journaled for rotation transversely of the bed in a bearing bushing 102 in the rear wall 12 and in a bearing bushing 103 in a boss 104 rising from the bottom wall 8 of the bed at a point spaced from the front wall 11.
  • Mounted upon the end of the shaft 101 is a counterbalanced crank plate 105. Endwis'e sliding motion of the shaft 101 is prevented by the crank plate 105 and a collar 106 which are arranged upon opposite sides of the bearing bushing 104.
  • the crank pin 92 is integral with a mounting plate 107 and is formed with the axis thereof skewed rather than. normal to the plane of the plate 107.
  • the plate 107 is mounted in a groove 108 in the face of the crank plate 105, which groove provides for adjustment ofthe 6 plate 107 in a direction radially of the axis of the looper drive shaft 101, and it is secured in adjusted position by screws 109 that extend through elongated slots 110 in the plate 107 and screwed into the crank plate 105.
  • Figs. 6 and 7 there is illustrated a modification of the looper drive mechanism including means for eifecting adjustment of the axis of the crank pin 92 toward and away from a position parallel to the axis of the shaft 101, which means comprises an adjusting screw 111 threaded through one end of the mounting plate 107 and abutting against the crank plate 105 so that when the screws 109 are tightened, the mounting plate 107 will abut against the crank plate 105 only at the screw 111 and at the forward edge, thereby tilting the plate.
  • the looper drive shaft 101 is disposed above the level of the looper bar 72.
  • the mechanics of this construction will produce the desired rapid loopseizing motion of the looper and a retarded loop-shedding motion.
  • the aperture 113 is large enough to permit passage therethrough of the looper drive shaft 101 with crank plate 105 and the mounting plate 107 as.-muld thereon.
  • the number of needles and cooperating loopers is limited to two or three and they are limited to narrow gauges.
  • One of the basic objectives of the present invention is to provide a universal machine which can be readily modified and fitted for different specific sewing operations. Accordingly, one of the primary advantages of the present looper mechanism is that there can be readily substituted therefor a looper mechanism having loopers movable transversely of the bed, thus providing for a larger number of needles or for wider gauges.
  • the crank pin 92 is arranged normal to the mounting plate 107 and is made with a small throw to impart only a small axial movement to the looper bar 72, which movement is now the needle-avoiding motion.
  • the looper drive shaft 101 is journaled only in the boss 104 to provide clearance for extending the main shaft 36 through the bed section 15 of the compartment 9, and an eccentric is mounted on the extension and is connected by a pitman and crank to the looper bar to oscillate the same.
  • the presser mechanism of the machine is illustrated in Figs. 3, 4, 8 and 9, and comprises a short hollow presser bar 116 mounted in the head 4 for vertical sliding movement in a bearing bushing 117 in the bottom of the head. At its lower end, the presser bar 116 bassecured thereto by a screw 118 a presser foot 119.
  • the presser 'bar 116 has an axial bore -120 extending inward

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

Description

March 28, 1961 H. HACKLANDER SEWING MACHINES l7 Sheets-Sheet 1 m''k/l/l/l/l/A Filed Sept. 14, 1956 INVENTOR. Hans Hack/under a my.
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WITNESS ATTORNEY March 28, 1961 H. HACKLANDER SEWING MACHINES 17 Sheets-Sheet 2 Filed Sept. 14, 1956 oom 5m man H. HACKLANDER SEWING MACHINES March 28, 1961 17 Sheets-Sheet 3 Filed Sept. 14, 1956 527 526 528 INVENTOR.
Hans Hack/under BY W ZTORNEY WITNESS March 28, 1961 I H. HACKLANDER SEWING MACHINES eta-Sheet 4 Filed Sept. 14. 1956 INVENTOR Hans Hack/under March 28, 1961 H. HACKLANDER SEWING MACHINES 5 t e e h w s t e e h s 7 1 .mwm 6 I III] xflgrli l 1. an... M 2.? e .T... 06 p "m d L Lim i a la a e n w F N: v: N m
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IN VEN TOR. Hans Hack/under ATT RNE Y March 28, 1961 H. HACKLANDER 2,976,831
SEWING MACHINES Filed Sept. 14, 1956 17 Sheets-Sheet 6 H. HACKLANDER 2,976,831
SEWING MACHINES l7 Sheets-Sheet 7 5 March 28, 1961 Filed Sept. 14, 1956 m-m W .0 IL: ay/A2 II-E: 0 7
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INVENTOR. Hans Hack/under BY My ATTORNEY WITNESS W a i March 28, 1961 H. HACKLANDER SEWING MACHINES l7 Sheets-Sheet 9 Filed Sept. 14, 1956 IN VEN TOR. Hans Hack/under BY W i TORNEY W/TNESS March 28, 1961 H. HACKLANDER SEWING MACHINES l7 Sheets-Sheet 10 Filed Sept. 14, 1956 IN VEN TOR. Hans Hack/under BY W r'roRA/n WITNESS F ig. 3!.
W fid ai March 28, 1961 H. HACKLANDER SEWING MACHINES Filed Sept. 14, 1956 l7 Sheets-Sheet 11 T2 TI 207. 246
INVEN TOR. Hans Hack lander @1%/ TORNEY March 28, 1961 H. HACKLANDER SEWING MACHINES l7 Sheets-Sheet 12 Filed Sept. 14, 1956 I N VEN TOR. Hans Hack/under BY W ETTORNEY March 28, 1961 H. HACKLANDER SEWING MACHINES Filed Sept. 14, 1956 IN VEN TOR. Hans Hack/under 1%TORNEY l7 Sheets-Sheet 14 WITNESS March 28, 1961 H. HACKLANDER SEWING MACHINES l7 Sheets-Sheet 15 Filed Sept. 14, 1956 0% R? we IN VEN TOR. Hans Hack/under WITNESS March 28, 1961 H. HACKLANDER SEWING MACHINES l7 Sheets-Sheet 16 Filed Sept. 14, 1956 mm 5 om E mom a.
INVENTOR. Hans Hack/under ATQORNEY WITNESS W 0 14 March 28, 1961 H. HACKLANDER SEWING MACHINES 17 Sheets-Sheet 1'? Filed Sept. 14, 1956 lllll' Fig. 37
I N VEN TOR. Hans Hack/under I W 9. 6%, 476 54-36 ATTORNE WITNESS 485 wfi i nitd L SEWING MACHINES Filed Sept. 14, 1956, Ser. No. 609,836
13 Claims. (Cl. 112-220) The present invention relates to sewing machines and particularly to high speed automatically lubricated industrial sewing machines which operate at speeds up wardly of 5000 stitches per minute, and at such speeds, will form perfect stitching, will be eflicient and durable and quieter and vibration free, and which also will be neat and attractive.
One of the principal objects of this invention is to provide a sewing machine in which a single basic machine is designed to be conveniently modified and/or fitted with various attachment mechanisms to adapt the machine for a large number of different specific sewing operations. Accordingly, it is an object of this invention to provide a new and improved universal attachment drive mechanism which can be used to actuate any one of a number of specific attachment mechanisms, 'which drive mechanism will be eificient and durable when used to drive any selected one of the various attachment mechanisms, and which drive mechanism is designed into the machine, for purpose of appearance as well as safety, in combination with a bracket-arm that is angled relative to the bed to improve visibility at the point of stitch formation and a needle-bar actuating rock lever arranged in an optimum manner longitudinally of the bracket-arm.
It is a further object of this invention to provide a new and improved alternating presser mechanism and specifically one adapted for use with a novel drive mechanism that is designed to be used to actuate any onev of a number of other attachments, and which at the same time will be economical, dependable, durable and efiicient. It is a further object of this invention to provide an improved looper mechanism for a chain stitch sewing machine the mechanics of which will adapt it for high speed operation and to provide a looper mechanism in which the only motions imparted to the looper bar are axial reciprocation and oscillation, thereby facilitating making an oil-tight bearing and thus adapting it for use in an automatically lubricated sewing machine, as well as to provide a looper mechanism which can be quickly and easily assembled and adjusted. At the same time, it is an object of this invention to provide a looper mechanism which can be readily converted from one in which the looper motion is transverse to the line of feed to one in which the looper motion is parallel to the line of feed.
It is a further object of this invention to provide an improved feeding mechanism that is adapted for high speed operation and which can be readily modified from a plain to a diiferential feed, and in which, as a differential feeding mechanism, the elevation of the parts is substantially reduced, having in mind the end that the feed bar should be substantially horizontal and that the path of the feed dog above the cloth plate should also be substantially horizontal. It is also an object of this invention to provide a new and improved feed-dog height adjusting means which is particularly useful in a differential feeding mechanism wherein the height of the main and auxiliary feed dogs will be adjusted simultaneously.
2,976,831 I Patented Mar. '28, 1961 It is a further object of this invention to provide a thread tension mechanism having a pair of opposed thread tension discs that are released by means of a releasing pin projected between the discs, which mechanism is constructed and arranged to prevent the shank of the releasing pin from being forced against the periphery of the discs, and to provide a tension releasing mechanism combined with the presser lifter mechanism and that is constructed and arranged to effect complete release of the tension mechanism during the initial actuation of the presser lifter.
Fig. 1 is a front elevational view of a sewing machine embodying the present invention, partly broken away and in section.
Fig. 2 is a top plan view of the sewing machine of Fig. 1 with the top cover plate removed.
Fig. 3 is a head end elevation view of the sewing machine of Fig. 1 with the face plate removed.
Fig. 4 is a vertical sectional view longitudinally of the sewing machine of Fig. 1.
Fig. 5 is a horizontal sectional view of the sewing machine of Fig. 1 with the cloth plate and its supporting bracket and the bed cover plate removed.
Fig. 6 is a fragmentary detail view in elevation of g a modification of the looper drive crank.
Fig. 7 is a fragmentary horizontal sectional view taken substantially on the line 77 of Fig. 4 and illustrating the modified looper drive crank of Fig. 6.
Fig. 8 is a horizontal sectional View through the bracketarm ofthe sewing machine illustrated in Fig. 1.
Fig. 9 is a vertical sectional view through the standard of the sewing machine illustrated in Fig. 1 andtaken substantially on the line 9-9 of Fig. 4. p I
Fig. 10 is a sectional view taken substantially on the line 10-10 of Fig. 5.
Fig. 1 1 is a fragmentary sectional view taken substantially on the line 11-11 of Fig. 10.
Fig. 12 is a fragmentary detail sectional view of the feed-dog mounting taken substantially on the line 12-12 of Fig. 10.
Fig. 13 is a fragmentary elevational view of the needle thread tension device of the machine illustrated in Fig. 1.
Fig. 14 is a view similar to Fig. 13 but illustrating the parts in a different position.
Fig. 15 is a sectional view taken substantially on the line 15-15 of Fig. 14.
Fig. 16 is a fragmentary plan view of the bed of the machine illustrated in Fig. l, with the cloth plate removed, showing the looper thread take-up mechanism.
Fig. 17 is an enlarged fragmentary sectional view taken substantially on the line 17-17 of Fig. 16.
Figs. 18, 19 and 20 are sectional views similar to Fig. 17 but illustrating the parts in different positions of operation.
Fig. 21 is a fragmentary plan view of the bed with the cloth plate and the supporting bracket removed and illustrating a diiferential feeding mechanism in place of the plain feeding mechanism of Fig. 1.
Fig. 22 is a sectional view taken substantially on the line 22-22 of Fig. 21.
Fig. 23 is a fragmentary detail sectional view taken substantially on the line 23-23 of Fig. 22.
Fig. 24 is a rear elevational view, partly broken away, of the mechanism illustrated in Fig. 21.
Fig. 25 is a fragmentary detail sectional view taken substantially on the line 25-25 of Fig. 21.
Fig. 26 is a fragmentary vertical sectional view longitudinally of the machine of Fig. 1 and illustrating an alternating presser mechanism applied thereto.
Fig. 27 is a horizontal sectional view taken substantially on the line 27-27 of Fig. 26;
Fig. 28 is a fragmentary horizontal sectional view on an enlarged scale of the head end of the machine as illustrated in Fig. 27.
Fig. 29 is a fragmentary head end elevational view of the alternating presser mechanism as illustrated in Fig. 27.
Fig. 30 is a sectional view taken on the line 30-30 of Fig. 28.
Fig. 31 is a detail sectional view taken substantially on the line 3131 of Fig. 16.
Fig. 32 is a detail view in elevation of a portion of the looper thread take-up mechanism.
Fig. 33 is a fragmentary sectional view taken substantially on the line 33-33 of Fig. 16.
Fig. 34 is a head end elevational view of the sewing machine of Fig. l and illustrating a close coupled top puller feed mechanism applied thereto.
Fig. 35 is a fragmentary rear elevational view of the head of the sewing machine illustrated in Fig. 34.
Fig. 36 is a detail sectional view taken substantially on the line 36-36 of Fig. 35.
Fig. 37 is a detail sectional view taken substantially on the line 3737 of Fig. 35.
In the drawings there is illustrated a sewing machine having a bed 1 from one end of which rises a vertical hollow standard 2 that carries a hollow bracket-arm 3 terminating in a head *4. The top of the bracket-arm 3 is open to provide access to the mechanism therein and is adapted to be closed by a cover plate 5. A face plate 6 is provided to close the open end of the head 4.
With reference to Figs. 4 and 5, the bed 1 is divided by a transverse vertical wall 7 upstanding from a bottom wall 8 into a closed splash-lubricated compartment 9, which is to the right of the wall 7 in Fig. 4, and a space 10 outside the closed compartment 9 for accommodating the lower feed and looper mechanisms of the machine. The closed splash-lubricated compartment!) is surrounded by a front wall 11, a rear wall 12, and an end wall 13; For convenience, that portion of the com.- partment 9 which is below the standard 2 is referred to as a standard section 14, and the remainder of the compartment 9 is referred to as a bed section 15.
The standard section 14 of the bed compartment 9 is open at the bottom for access and is normally closed by an oil-tight gasketed plate 14a secured in place by screws 14b. The standard section 14 is also open at the top within the confines of the standard 2 and thus communicates with the hollow interior of the standard 2. The bed section 15 is open-at the top and is closed by a gasketed oil-tight cover plate 16. A work-supporting cloth plate 17 extends over the bed section 15 and the space 10 and is mounted on the cover plate 16 and, above the space 10, is supported by a bracket 18. Fig. 16, which is in turn mounted at the left front corner upon the top of a support 19 upstanding from the bottom wall 8, at the left rear corner on a post 20 screwed into the bottom wall 8, at the right front and rear corners on bosses Hand 22 respectively extending laterally from the wall 7. The bracket 18 supports the throat plate 23 and for this purpose is provided with two threaded apertures 24 for receiving throat plate fastening screws 25. The cloth plate 17 is provided with an aperture 26 to accommodate the throat plate 23 and a pair of plates 27 and 28. The plate 27 is removably secured in place by a snap connector comprising a resilient spring wire clip 29, Figs. 16 and 31, secured to the underside of the bracket 18 and cooperating with a necked portion on. a stud 30 that extends downwardly from the plate 27 and through a hole 31 in the bracket 18. Removal of the plate 27 is facilitated by a finger hole 32, Fig. 2. The plate 28 is also adapted to be secured in place by a pair of snap fasteners similar to the one for the plate 27 and including spring wire clips 33 and 34, the clip 33 being secured to the underside of the cloth plate 17 and the clip 34 being secured to the underside of the bracket 18. i
Disposed between the bed section 15 and the standard section 14 is a short, transverse upstanding bearing boss 35, Fig. 4. The main shaft 36 of the machine is arranged longitudinally of the bed 1 in a bearing bushing 37 in the boss 35 and in a bearing bushing 38 carried by an insert 39 in the end wall 13. Mounted upon the exposed end of the main shaft 36 is a combined hand wheel and belt pulley 40, Fig. l, which is hollow to receive a counterweight 41 and is closed by a cover plate 42.
As best seen in Figs. 2 and 9, the standard 2 is mounted to the rear of the bed 1 and rises vertically therefrom with the hollow interior of the standard open to the interior of the standard section 14 of the bed compartment 9. As seen in Fig. 2, the bracket-arm 3, which is mounted upon the top of the standard 2, extends diagonally across the bed, or in other words, is angled forwardly relative to the bed 1 and main shaft 36 so that the head 4 is disposed adjacent to the front of the machine. This arrangement places the point of stitch formation very close to the front of the machine and thereby increases the visibility of the operator and facilitates manipulation of the work. It is also many times necessary for the operator to reach behind the head for manipulation or handling of the work which is facilitated by having the head 4 arranged forwardly of the standard 2. Also to facilitate reaching behind the head 4, the standard 2 has a cutaway portion 43, Figs. 1 and 3. located at the front corner adjacent to the working surface of the machine. The angled arm is also advantageous in the combination thereof in the present machine with a stepped or offset needle-bar drive rock lever and a pair of attachment drive shafts journaled in the bracketarm, as hereinafter discussed.
N eedle mechanism The needle mechanism of the present machine is best shown in Figs. 3, 4, 8 and 9, and comprises a needle-bar 44 mounted for endwise reciprocation in bearing bushings 45 and 46 in the head 4. The illustrated machine is adapted to sew a double seam, i.e., two two-thread chain stitch lines of stitches, so there is secured to the lower end of the needle bar 44, by a needle clamp 47, a pair of needles 48. Within the head 4, there is secured to the needle-bar 44 a collar 49 having a needle thread take-up arm 50 secured thereto. The take-up arm 50 extends through a slot 51 in the head 4 and is provided with two thread eyes 52. The collar 49 is also provided with an arm 53 that is connected by a pivoted link 54 to one arm 55 of a needle-bar drive rock lever, designated generally at 56, which is arranged longitudinally of the bracket-arm 3. In addition to the arm 55, the rock lever 56 includes a hub 57 and a second arm 58 extending from the hub 57 in the opposite direction from the arm 55. The hub 57 has a bore that receives a pivot shaft 59 journaled for oscillation on a horizontal axis transversely of the bracket-arm 3 in bearing bushings 60 and 61. The free end of the arm 58 is secured to a connecting rod 62 by a ball and socket joint including a ball 63 upon the end of a stud 64 that is secured in a longitudinal bore in the end of the arm 58 and a twopart socket including a separable element 65. The lower end of the connecting rod 62 has a two-part strap including a separable element 66, which strap surrounds a crank 67 formed on the main shaft 36 and having counterbalances 68. Thus, upon rotation of the main shaft 36, oscillation will be imparted to the rock lever 56, which will in turn impart oscillation to the needle-bar 44.
The assembly openings in the bracket-arm 3 for the pivot shaft 59 are closed at the front by a plate 69 and at the rear by a plate 70 having a stud 71 with a threaded end and upon which a sewing light (not shown) is adapted to be secured.
The specific construction and arrangement of the needle-bar rock lever 56, particularly with relation to a aera's'ei pair of attachment driving shafts, is hereafter more fully discussed.
Looper mechanism The herein described looper mechanism has been divided from this application and now forms the subject matter of divisional application Serial No. 734,182, filed May 9, 1958.
The looper mechanism of the present machine is disclosed in Figs. 4, 5 and and comprises a looper bar 72 disposed in the space 10 in the bed 1 and mounted for oscillation and for axial sliding movement in a direction parallel to the axis of the main shaft 36 in a bearing bushing 73 carried by a boss 74 extending upwardly from the bottom plate 8 of the bed and a bearing bushing 75 carried by the wall 7. A looper carrier 76 is mounted on the looper bar 72 by means of a split-ring connection having a clamping screw 77. A pair of straight-line type threaded chain stitch loopers 78 are mounted on the looper carrier 76, the loopers having cylindrical shanks 79 that are received within vertical bores in the looper carrier 76 and locked in adjusted position by set screws 80. Each of the loopers 78 is adapted to cooperate individually with one of the needles 48 in the formation of a two thread chain stitch line of stitching, axial reciprocation of the looper bar 72 imparting loop-seizing or advance and loop-shedding or return motions to the loopers 78, and oscillation of the looper bar 72 imparting the loop-spreading or needleavoiding motions to the loopers. The loopers are universally adjustable to obtain the desired setting relative to the needles 48 in that the looper carrier 76 can be adjusted axially and angularly of the looper bar 72 and the shanks 79 of the loopers 78 can be adjusted axially and angularly relative to the looper carrier 76.
The looper bar 72 extends through the bearing 75 into the bed section of the closed bed compartment 9 and the end thereof is secured by a universal joint 81 to one end of a connecting rod 82. The universal joint 81 comprises a yoke 83 on the end of the looper bar 72, the yoke being apertured to receive pivotally a pin 84. Mounted on the pin 84 between the arms of the yoke 83 and secured thereto by a set screw 85 is a sleeve 86 having integral therewith a yoke 87 apertured transversely to the axis of the sleeve 86 to receive pivotally a pin 88. Mounted on the pin 88 between the arms of the yoke 87 and secured thereto by a set screw 89 is a sleeve 90 formed upon the end of the connecting rod 82.
The opposite end of the connecting rod 82 is secured by a universal joint 91 to a crank pin 92, the universal joint 91 comprising a sleeve 93 mounted upon and secured by a set screw 94 to a pin 95 that is pivotally mounted in the arms of a yoke 96 having integral therewith a hub or sleeve 97 that is in turn pivotally mounted upon the crank pin 92. The sleeve 97 is held on the crank pin 92 by a screw 98.
The drive for the looper mechanism comprises a bevel gear 99 secured upon the end of the main shaft 36 which extends through the bearing bushing 37 into the bed section 15 of the closed bed compartment 9. The gear 99 meshes with a similar gear 100 on a looper drive shaft 101 journaled for rotation transversely of the bed in a bearing bushing 102 in the rear wall 12 and in a bearing bushing 103 in a boss 104 rising from the bottom wall 8 of the bed at a point spaced from the front wall 11. Mounted upon the end of the shaft 101 is a counterbalanced crank plate 105. Endwis'e sliding motion of the shaft 101 is prevented by the crank plate 105 and a collar 106 which are arranged upon opposite sides of the bearing bushing 104.
The crank pin 92 is integral with a mounting plate 107 and is formed with the axis thereof skewed rather than. normal to the plane of the plate 107. The plate 107 is mounted in a groove 108 in the face of the crank plate 105, which groove provides for adjustment ofthe 6 plate 107 in a direction radially of the axis of the looper drive shaft 101, and it is secured in adjusted position by screws 109 that extend through elongated slots 110 in the plate 107 and screwed into the crank plate 105.
In Figs. 6 and 7 there is illustrated a modification of the looper drive mechanism including means for eifecting adjustment of the axis of the crank pin 92 toward and away from a position parallel to the axis of the shaft 101, which means comprises an adjusting screw 111 threaded through one end of the mounting plate 107 and abutting against the crank plate 105 so that when the screws 109 are tightened, the mounting plate 107 will abut against the crank plate 105 only at the screw 111 and at the forward edge, thereby tilting the plate.
In operation, upon rotation of the main shaft 36, r0.- tation will be imparted to the looper drive shaft 101, which carries the crank pin 92 and will therefore rotate the crank pin 92 about the axis of the shaft 101. The throw of the crank pin 92 will, through the connecting rod 82 and the universal joints 81 and 91, impart axial sliding to the looper bar 72, which will effect advance and return motions of the loopers 78. At the same time, because of the skewed axis of the crank pin 92, it will gyrate as it rotatse about the axis of the shaft 101, which gyration will be transmitted to the looper bar 72 to impart oscillation thereto that will efiect the loop spreading or needle avoiding motions of the loopers 78. Adjustment of the advance and return motion of the loopers is provided by the screws '109 and the slots 1'10, and adjustment of the loop spreading motion of the loopers may be provided by the adjusting screw 111.
As seen in Fig. 4 the looper drive shaft 101 is disposed above the level of the looper bar 72. The mechanics of this construction will produce the desired rapid loopseizing motion of the looper and a retarded loop-shedding motion.
For assembly purposes, there is provided van aperture 112 in the rear wall 12 and an aperture 113 in the front wall 11 in axial alignment with the looper drive shaft 101, which apertures are closed by cover plates 114 and 115 respectively. The aperture 113 is large enough to permit passage therethrough of the looper drive shaft 101 with crank plate 105 and the mounting plate 107 as.- sembled thereon.
In the above construction in which the looper motion is longitudinally of the bed, the number of needles and cooperating loopers is limited to two or three and they are limited to narrow gauges. One of the basic objectives of the present invention is to provide a universal machine which can be readily modified and fitted for different specific sewing operations. Accordingly, one of the primary advantages of the present looper mechanism is that there can be readily substituted therefor a looper mechanism having loopers movable transversely of the bed, thus providing for a larger number of needles or for wider gauges. In such a construction, the crank pin 92 is arranged normal to the mounting plate 107 and is made with a small throw to impart only a small axial movement to the looper bar 72, which movement is now the needle-avoiding motion. For the advance and return movement, the looper drive shaft 101 is journaled only in the boss 104 to provide clearance for extending the main shaft 36 through the bed section 15 of the compartment 9, and an eccentric is mounted on the extension and is connected by a pitman and crank to the looper bar to oscillate the same.
Presser mechanism The presser mechanism of the machine is illustrated in Figs. 3, 4, 8 and 9, and comprises a short hollow presser bar 116 mounted in the head 4 for vertical sliding movement in a bearing bushing 117 in the bottom of the head. At its lower end, the presser bar 116 bassecured thereto by a screw 118 a presser foot 119. The presser 'bar 116 has an axial bore -120 extending inward
US609836A 1956-09-14 1956-09-14 Sewing machines Expired - Lifetime US2976831A (en)

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US609836A US2976831A (en) 1956-09-14 1956-09-14 Sewing machines
GB33198/58A GB839233A (en) 1956-09-14 1957-09-13 Thread tension mechanism for sewing machines
US693927A US2974617A (en) 1956-09-14 1957-11-01 Feeding mechanisms for sewing machines
US694682A US2902959A (en) 1956-09-14 1957-11-05 Thread tension mechanisms for sewing machines
US73418A US3016851A (en) 1956-09-14 1958-05-09 Looper mechanisms for sewing machines

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213815A (en) * 1962-11-30 1965-10-26 Russmann Karl Spool holder arrangement for sewing machines
US3225624A (en) * 1962-12-10 1965-12-28 Singer Co Handwheel for sewing machines
US3468272A (en) * 1966-11-14 1969-09-23 Aisin Seiki Feed mechanism in sewing machine
US3640236A (en) * 1969-07-03 1972-02-08 Duerkoppwerke Thread retainer for sewing machines
US6932009B1 (en) * 2004-05-21 2005-08-23 Ching Chi Machine Co., Ltd. Thread tension adjustment device of multi-needle sewing machine

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US1248827A (en) * 1914-03-30 1917-12-04 Singer Mfg Co Presser-foot mechanism for sewing-machines.
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US2102202A (en) * 1934-12-31 1937-12-14 Mauser Werke Ag Differential feed device for sewing machines
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US722014A (en) * 1900-12-15 1903-03-03 Orville S Harmon Feeding device for sewing-machines.
US1248827A (en) * 1914-03-30 1917-12-04 Singer Mfg Co Presser-foot mechanism for sewing-machines.
US1387139A (en) * 1919-04-30 1921-08-09 Flanagan James Alexander Tension for sewing-machines
US1737395A (en) * 1927-04-08 1929-11-26 Union Special Machine Co Needle-actuating mechanism for sewing machines
US1843188A (en) * 1928-08-02 1932-02-02 Union Special Machine Co Sewing machine
US2102202A (en) * 1934-12-31 1937-12-14 Mauser Werke Ag Differential feed device for sewing machines
US2119316A (en) * 1936-11-19 1938-05-31 Singer Mfg Co Feeding mechanism for sewing machines
US2199174A (en) * 1937-04-12 1940-04-30 Geoffrey Stevenson Differential feeding mechanism for sewing machines
US2189657A (en) * 1937-04-21 1940-02-06 Union Special Machine Co Feed mechanism for sewing machines and the like
US2193754A (en) * 1938-06-17 1940-03-12 Singer Mfg Co Feeding mechanism for sewing machines
US2242962A (en) * 1939-09-13 1941-05-20 Singer Mfg Co Sewing machine
US2325643A (en) * 1940-05-17 1943-08-03 Willcox & Gibbs Sewing Machine Feeding mechanism
US2401216A (en) * 1945-06-09 1946-05-28 Singer Mfg Co Presser-foot lifting mechanism for sewing machines
US2482079A (en) * 1947-03-04 1949-09-13 Singer Mfg Co Loop-spreader mechanism for chainstitch sewing machines
US2670703A (en) * 1950-10-24 1954-03-02 Union Special Machine Co Sewing machine with puller drive
US2718859A (en) * 1951-10-17 1955-09-27 Singer Mfg Co Looper spreader mechanisms for sewing machines

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3213815A (en) * 1962-11-30 1965-10-26 Russmann Karl Spool holder arrangement for sewing machines
US3225624A (en) * 1962-12-10 1965-12-28 Singer Co Handwheel for sewing machines
US3468272A (en) * 1966-11-14 1969-09-23 Aisin Seiki Feed mechanism in sewing machine
US3640236A (en) * 1969-07-03 1972-02-08 Duerkoppwerke Thread retainer for sewing machines
US6932009B1 (en) * 2004-05-21 2005-08-23 Ching Chi Machine Co., Ltd. Thread tension adjustment device of multi-needle sewing machine

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