US2938477A - Bar-tacker trimming mechanisms - Google Patents

Bar-tacker trimming mechanisms Download PDF

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Publication number
US2938477A
US2938477A US660779A US66077957A US2938477A US 2938477 A US2938477 A US 2938477A US 660779 A US660779 A US 660779A US 66077957 A US66077957 A US 66077957A US 2938477 A US2938477 A US 2938477A
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United States
Prior art keywords
cam
sewing machine
frame
standard
arm
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US660779A
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English (en)
Inventor
Richard P Graham
Michael F Ivanko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Singer Co
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Singer Co
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Publication date
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Priority to US660779A priority Critical patent/US2938477A/en
Priority to DES27168U priority patent/DE1821113U/de
Application granted granted Critical
Publication of US2938477A publication Critical patent/US2938477A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B21/00—Sewing machines with devices for automatically controlling movement of work-carrier relative to stitch-forming mechanism in order to obtain particular configuration of seam, e.g. programme-controlled for sewing collars, for attaching pockets
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2303/00—Applied objects or articles
    • D05D2303/12—Rigid objects
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2303/00—Applied objects or articles
    • D05D2303/12—Rigid objects
    • D05D2303/14—Buttons

Definitions

  • This invention relates to cyclicallyoperated sewing machines, and more particularly to a cyclic sewing machine of which the operation'is pattern cam controlled.
  • Fig. 1 is a front perspective view of a sewing machine having this invention applied thereto,
  • Fig. 2 represents a side elevational view of the sewing machine of Pig. 1 with portions of the machine frame, sub-base, and mechanism therein being broken away and illustrated in vertical cross-section,
  • Fig. 3 represents a rear or standard end elevational view of the sewing machine of Fig. 1;
  • Fig. 4 represents a bottom plan view of the sewing machine of Fig. 1.
  • this invention is illustrated as applied to a cyclic or group stitch sewing machine; that is, a sewing machine capable of producinga tack of stitches of a predetermined number and arrangement such as would be useful in sewing on buttons, clips and the like or in producing ornamental or reinforcing tacks of stitches.
  • the sewing machine illustrated in the drawings is of the so called cylinder bed variety in that the machine frame includes a free ended work supporting bed 11 of generally cylindrical cross-section on which tubular articles may be stitched conveniently.
  • the bed is formed to extend from a hollow vertical standard 12 formed with a bracket arm 13 which overhangs the bed.
  • a main drive shaft 14 journaled in the bracket arm and standard is operably connected in conventional manner to reciprocate a needle bar 15' carried in the bracket arm and a needle thread take-up lever 16 which extends through a slot 17 formed in the bracket arm.
  • a crank 18 formed on the main drive shaft 14 is embraced by a pitrnan 19 pivoted to a bell crank 20 journaled on a pivot pin 21 at the juncture of the standard and the bed.
  • the bell crank 2%? is bifurcated as illustrated in Fig. 2 and embraces a slide block 23 carried on a rock arm 24 fast on a bed shaft 25 journaled lengthwise in the bed.
  • bed shaft which is thus oscillated, drives a loop taker 26 of conventional construction arranged in the bed to cooperate with the needle in the formation of stitches.
  • the frame of the sewing machine is carried upon a subbase 27 formed with depending feet 28 adapted to provide a stable support for the sewing machine.
  • a flanged hearing spindle 29 is seated inan aperturein the sub-base and secured to the machine standard by means of a fastening bolt 30.
  • a locating pin 31 prevents the bearing spindle from turning and also locks the frame subbase and bearing spindle against relative turning movement.
  • a gear 32 is journaled for turning-on the bearing spindle and maintained on the spindle by a flanged head 33' of a fastening screw 34.
  • a single pattern cam disc 36 formed in the top surface with a pair of cam grooves 37, 38 and formed in the bottom surface with a cam groove 39 and with a shallow arcuate groove 40 adapted loosely to accommodate a pair of cam lug members 41 each slotted to accomrnodate a fastening screw 42;
  • The'pattern cam 36 is driven by a shaft 43 journaled vertically in the standard and carrying a pinion 4-4 arranged in mesh with the gear 32.
  • a worm wheel 45 fast on the top of the shaft 43- is in mesh with a worm gear 46 fast on the main drive shaft 14.
  • Figs. 1 and 2 illustrate a stop motion device applied to the main drive shaft 14 of the sewing machine by which a driving belt (not shown) may be established in driving relation with the main shaft or the driving relation discontinued, the stop motion device also provides for a positive interlock between the machine frame and the main drive shaft so that the sewing machine may be stopped in a predetermined position in a stitching cycle.
  • the stopmotion mechanism is preferably of the type disclosed in the U.S. patent of Ivanko 2,721,526, Oct. 25, 1956.10 which reference may be had for a more complete description thereof.
  • a Fast on the main shaft 14 outside the standard of the machine frame is the hub and inside flange 47 of a two part pulley of which the outside flange 48 is freely journaled and axially shiftable on the main shaft and is provided with a thrust bearing 49.
  • Pivoted on a pin 50 carried between lugs 5-1 formed on the standard is a stop motion controlling frame 52 which embraces a stop lever 53' slidably journaled on the main shaft between the frame and the hub of the pulley flange 47.
  • Fixed to the frame 52 is an upturned arm 54 which extends to a position opposite the thrust bearing,,49.
  • the arm 54 When the frame 52 is swung in a clockwise direction to the position as illustrated in Fig. 2, the arm 54 is shifted away from the thrust bearing allowing the outside flange of the pulley to separate from the inside flange, thusdiscontinuing the driving relation between the belt and .pulley.
  • the stop lever 53 is also shifted into interlocked relation with a stop notch (not shown) in the hub of the inside flange to lock the main shaft in a definite stopped
  • the stop lever 53 is pivoted to a plunger 55 which is resiliently centered with respect to the frame 52 by means of a pair of coil springs 56.
  • Thestop motion controlling frame 52 is connected by a rod 57 to a latch block 58 pivoted within the machine frame.
  • the latch block is connected by a rod 59 to a starting lever 60 pivoted on the pin 50 and also cooperates with a latch finger 61 pivoted within the machine frame and biased by a spring 62 to play over a. pair of notches 63 formed inthe latch block.
  • the starting. lever motion controlling frame in a counter clockwise direction to release the positive interlock and to establish driving relation between a driving belt and the pulley.
  • the stop motion frame 52 is spring biased in a clockwise direction and toward the position illustrated in Fig.
  • the latch finger 61 constrains the frame 52 in a counter clockwise or running position. The machine will operate, therefore, until the latch finger is tripped out of both of the notches 63 of the latch block, the deepest notch corresponding to the operative or running position of the parts and the second notch corresponding to an intermediate position of the parts in which the machine will coast since the driving relation of the belt is discontinued but the stop lever 53 is not shifted against the notched hub of the fast pulley flange 47.
  • the latch finger 61 is also provided with a handle in the form of a pin 67 which projects outwardly through the standard wall and provides for a manual release of the latch finger.
  • the latch finger 61 is tripped out of the notches 63 in the latch block by the cam lug members 41 carried beneath the pattern cam disc.
  • a cam follower arm 70 disposed in the path of travel of the cam lug members 41 is seated in the free extremity of a rock arm 71 by means of a fastening screw 72.
  • the rock arm is fast on a rock shaft 73 arranged coaxially within a tubular rock shaft 74. These coaxially arranged rock shafts 73 and 74 being journaled substantially vertically in a bracket 75 secured at the rear of the machine standard by the screws 76.
  • the rock shaft 73 extends upwardly to a point opposite the stop motion controlling frame 52 and is journaled near the upper extremity in a support pin 80 fixed in the machine standard.
  • Fast on the upper extremity of the rock shaft 73 is a rock arm 81 which is operably connected by means of a rod 82 to the latch finger 61.
  • the pattern cam is driven in a clockwise direction as illustrated in Fig.
  • cam lug members 41 are disposed to engage the cam follower arm 70 in seriatirn and are formed to trip the latch finger in seriatim out of the notches 63 of the latch block.
  • the second cam lug member 41 is formed to shift the cam follower arm an additional amount sufiicient to trip the latch finger completely out of the notches 63 so that during the succeeding revolution of the main drive shaft of the machine will be stopped in a positive manner.
  • the sewing machine is provided with a thread trimming mechanism operable at the end of each stitching cycle to sever the sewing threads.
  • the form and arrangement of the cutting surfaces of the thread cutter are substantially as disclosed in the US. patent of Horton 807,676, December 19, 1905, to which reference may be had for a more complete description thereof.
  • the cutter comprises two pointed thread engaging fingers 85 and 86 mounted beneath the throat plate 87 on the bed 11 for turning movement together about pivot pin 88.
  • a gear 89 Secured to the fingers 85 and 86 is a gear 89 which meshes with a rack 90 carried on a slide bar 91 slidably mounted in the bed 11 and extending through the hollow standard.
  • two slight increments of turning movement must be imparted to the thread engaging finger at precisely timed intervals during the final cycle of stitch formation in the group of stitches comprising the tack being formed.
  • the first of these movements must occur as the needle is beginning to descend for the last stitch at which time the point of the thread engaging finger 85 must be moved across the path of the needle in order to engage the limb of thread leading from the bobbin within the loop taker to the work.
  • the thread engaging finger 86 Immediately after the needle has risen from the work for the final time in the cycle and before the take up can remove the needle thread loop from the loop taker, the thread engaging finger 86 must be moved across the path of the needle to engage the needle thread loop.
  • the cam groove 39 beneath the pattern cam disc is, therefore, provided for this purpose.
  • the cam groove 39 is tracked by a roller follower 92 carried on a lever 93 fulcrumed on one of the sub-base feet 28.
  • a link 94 pivotally interconnects the lever 93 with the free extremity of a rock arm 95 fast on the lower end of the tubular rock shaft 74.
  • the rock arm 77 at the upper extremity of the tubular rock shaft is bifurcated and embraces a slide block 96 pivotally secured to the slide bar 91.
  • the thread engaging finger 86 is formed with an outwardly extending knife edged projection 102 which cooperates with a ledger blade 103 fixed beneath the throat plate to sever the thread limb carried by the thread engaging finger 86.
  • the finger 85 has a knife edge disposed in the throat plate groove 104 to sever its thread limb.
  • the predetermined pattern of stitches in the tack produced by this sewing machine is effected by shifting of the work fabric with respect to the axis of reciprocation of the needle.
  • the machine is fitted with a work clamp, indicated generally as 105, provided with a fiat lower jaw 106 carried on a base plate 107 disposed on the work supporting bed and extending within the hollow standard.
  • An upper jaw 108 slidable vertically in an arched bracket 109' is secured to the base plate 107.
  • a leaf spring 110 carried by the arched bracket bears downwardly on the upper jaw 108 biasing the Work clamp jaws together in work gripping relation.
  • a bar 111 slidably journaled in the bracket arm behind the needle bar in Fig. 1 carries a finger 112 which underlies a pin 113 fixed in the upper jaw of the clamp.
  • the bar 111 is operatively connected to the clamp opening lever 66 so that depression of the free end of the lever 66 will effect opening of the work clamp jaws.
  • the work clamp is slidably pivoted with respect to the machine frame for feedom of movement both transversely across the work supporting bed as well as lengthwise along the bed so that any desired patern ofstitches maybe formed.
  • aslide block 117 is rigidly secured to the base plate of the clamp and confined in a slot formed in a guide block 18 freely journaled in the free end of a lever arm 119 carired on the fulcrum stud 120 journaled in the work supporting bed.
  • Clamped to the fulcrum stud 120 beneath the bed is a lever arm 121 extending into the hollow standard where it is connected by means of a pivoted link 122 to a slotted lever 123 fulcrumed in the machine frame.
  • Another slotted lever 124 clamped fast on a rock shaft 125 journaled in the machine standard is pivotally connected to the lever 123 by means of a connecting pivot pin 126 which is adjustably secured in the slotted lever 124 and may be positioned at any selected position along the slot therein.
  • the rock shaft 125 extends from the standard downwardly and within the confines of the sub-base 27 and is formed with a rock arm 127 which carries a roller follower 128 arranged to track the pattern cam groove 38. Movement derived from the cam groove 38 is imparted to the clamp, therefore, in a direction transversely across the work supporting arm.
  • a roller follower 129 carried by a rock arm 130 fast on a rock shaft 131 journaled in the machine standard is arranged to track the cam groove 37 in the pattern cam.
  • a slotted lever 132 clamped on the rock shaft 131 and a cooperating slotted lever 133 fulcrumed in the machine frame are interconnected by a slide block 134 which is secured in selected position along the slot in the lever 132.
  • the slotted lever 133 has secured thereto a pivot pin 135 which is embraced by the base plate 107 of the work clamp. Movement derived from the cam groove 37, therefore, is supported to the work clamp in motion lengthwise along the work supporting arm.
  • This invention thus provides a novel arrangement of mechanism whereby the control of all of the auomatically operated devices of a cyclically operated sewing machine may be derived from a single pattern cam arranged in a sub-base beneath the sewing machine frame.
  • the present construction provides for a pattern of stitches by means of the work clamp shifting mechanism, control of the stop motion mechanism, and control of other mechanisms appurtenant to the sewing machine operation such as the thread trimming mechanism in a manner practically obviating any timing problems by virtue of a novel arrangement enabling a single pattern cam member to control all of these mechanisms.
  • the construction of the present invention has the advantage that it utilizes a pattern cam arranged in a subbase beneath the sewing machine thus conveniently accommodating a pattern cam of larger size than could otherwise be used and improving the balance and vibrational characteristics of the entire sewing machine and pattern cam construction.
  • Another advantage of the present invention resides in the ease and efficiency with which the machine may be readied to produce a completely different tack or pattern of stitches. If the number of stitches in the tack is not to be changed other than to an even multiple of the existing number of stitches, then all that is required is that the single pattern cam 36 be removed and replaced and possibly that the upper jaw of the work clamp be changed to suit the shape of the tack. The number of stitches in the tack may also be changed quickly and easily by removing and replacing the gear-and meshing pinion--when the pattern cam is changed.
  • a cyclic sewing machine having a frame including a work supporting bed, a hollow standard rising from said bed, and a needle supporting bracket arm carried by said standard and disposed to overlie said bed, a drive shaft journaled in said frame, stop motion mechanism associated with said drive shaft including latch means for maintaining said stop motion mechanism out of action, a shiftable work clamp carried by said frame, and a movable thread cutting mechanism, a sewing machine supporting sub-base disposed underlying said standard and beneath said work supporting bed, a pattern cam disk journaled in said sub-base and formed on each side with cam surfaces, pattern cam actuating means extending through said hollow standard and into said subbase operatively connecting said drive shaft with said pattern cam, cam follower mechanism carried by said sewing machine frame and extending downwardly into operative engagement with said cam surfaces at one side of said pattern cam disk, means operatively connecting said cam follower mechanism with said work clamp, a pair of pattern cam followers disposed for operative engagement with said cam surfaces at the opposite side of said pattern cam disk, a pair of rock arms each
  • a cyclic sewing machine having a frame, a drive shaft journaled in said frame, stop motion mechanism associated with said drive shaft including latch means for maintaining said stop motion mechanism out of action, mechanism carried by said frame for cutting the sewing threads at the end of each cycle of machine operation, and a shiftable work holding clam-p carried on said machine frame, a sewing machine supporting sub-base disposed underlying said standard and beneath'said sewing machine frame, a pattern cam disk journaled on a substantially vertical axis beneath said sub-base and formed on each side with cam surfaces, means carried within said sewing machine frame and extending downwardly into said sub-base for drivingly interconnecting said sewing machine drive shaft with said pattern cam disk, cam follower mechanism operatively connected to shift said work clamp, said follower mechanism carried by said sewing machine frame and extending downwardly into said sub-base in operative engagement with said cam,
  • a sewing machine having a frame including a standard, a work supporting arm projecting from said standard, and a bracket arm extending from said standard and overhanging said work supporting arm, stitch forming mechanism carried in said work supporting arm and in said bracket arm, means for actuating said stitch forming mechanism in timed relation in the formation of stitches, a stop motion mechanism associated with said actuating means for rendering said sewing machine cycle in operation, a work shifting clamp carried on said frame, and thread trimming mechanism carried in said work supporting arm for severing the sewing threads after each cycle of stitching, means for controlling the position of said stop motion mechanism, the operation of said thread trimming mechanism, and the movement of r 7 said work shifting clamp comprising, a sub-base, means on' 'sai d sub-base for supporting said sewing machine frame thereon, a single pattern cam member carried in 'saidsuB-base; a' pluralityof cam follower means carried by said sewing machine frame and extending downwardly beneath said sewing machine frame and into said subbase in operative'engagement with said
  • cam follower means including a first cam follower means operatively connected to shift said work holding clamp, ,930,637 Allen Oct. 17, 1933 a second cam follower means operatively connected to 10 1,33 69 Lyons Nov. 16, 1943 '4 names-

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US660779A 1957-05-22 1957-05-22 Bar-tacker trimming mechanisms Expired - Lifetime US2938477A (en)

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Application Number Priority Date Filing Date Title
US660779A US2938477A (en) 1957-05-22 1957-05-22 Bar-tacker trimming mechanisms
DES27168U DE1821113U (de) 1957-05-22 1958-05-22 Zyklisch arbeitende naehmaschine.

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US660779A US2938477A (en) 1957-05-22 1957-05-22 Bar-tacker trimming mechanisms

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073266A (en) * 1959-11-23 1963-01-15 Guide Anthony Spiral stitching attachment for sewing machines
US3112718A (en) * 1959-07-07 1963-12-03 Necchi Spa Work holding attachment for a sewing machine
US4646664A (en) * 1984-08-02 1987-03-03 Aisin Seiki Kabushiki Kaisha Cyclic sewing machine
US5743199A (en) * 1996-05-10 1998-04-28 The Singer Company N.V. Feeding mechanism of eyelet-end buttonhole sewing machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1878091A (en) * 1928-04-24 1932-09-20 Singer Mfg Co Stop-motion device
US1930637A (en) * 1931-07-16 1933-10-17 Singer Mfg Co Thread-cutting mechanism for sewing machines
US2334569A (en) * 1940-06-28 1943-11-16 United Corp Of Massachusetts Button or the like sewing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1878091A (en) * 1928-04-24 1932-09-20 Singer Mfg Co Stop-motion device
US1930637A (en) * 1931-07-16 1933-10-17 Singer Mfg Co Thread-cutting mechanism for sewing machines
US2334569A (en) * 1940-06-28 1943-11-16 United Corp Of Massachusetts Button or the like sewing machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3112718A (en) * 1959-07-07 1963-12-03 Necchi Spa Work holding attachment for a sewing machine
US3073266A (en) * 1959-11-23 1963-01-15 Guide Anthony Spiral stitching attachment for sewing machines
US4646664A (en) * 1984-08-02 1987-03-03 Aisin Seiki Kabushiki Kaisha Cyclic sewing machine
US5743199A (en) * 1996-05-10 1998-04-28 The Singer Company N.V. Feeding mechanism of eyelet-end buttonhole sewing machine

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Publication number Publication date
DE1821113U (de) 1960-11-03

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