US3894500A - Stop motion mechanism for sewing machines - Google Patents

Stop motion mechanism for sewing machines Download PDF

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Publication number
US3894500A
US3894500A US509957A US50995774A US3894500A US 3894500 A US3894500 A US 3894500A US 509957 A US509957 A US 509957A US 50995774 A US50995774 A US 50995774A US 3894500 A US3894500 A US 3894500A
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United States
Prior art keywords
cam
stop motion
motion mechanism
drive shaft
steps
Prior art date
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
US509957A
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English (en)
Inventor
James C Hsiao
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.)
Union Special Corp
Original Assignee
Union Special Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Union Special Corp filed Critical Union Special Corp
Priority to US509957A priority Critical patent/US3894500A/en
Priority to IT48675/75A priority patent/IT1032361B/it
Priority to FR7511256A priority patent/FR2286227A1/fr
Priority to ES436839A priority patent/ES436839A1/es
Priority to JP50052450A priority patent/JPS5923835B2/ja
Priority to GB22203/75A priority patent/GB1489460A/en
Application granted granted Critical
Publication of US3894500A publication Critical patent/US3894500A/en
Priority to DE2541378A priority patent/DE2541378C3/de
Priority to CA236,333A priority patent/CA1022009A/fr
Assigned to BT COMMERCIAL CORPORATION reassignment BT COMMERCIAL CORPORATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: UNION SPECIAL CORPORATION
Assigned to UNION SPECIAL CORPORATION reassignment UNION SPECIAL CORPORATION RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BT COMMERCIAL CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/22—Devices for stopping drive when sewing tools have reached a predetermined position

Definitions

  • ABSTRACT This disclosure relates to improvements in stop motion mechanisms of sewing machines
  • the improved stop motion mechanism permits the sewing machine drive shaft to coast for about 1 /2 revolutions before being abruptly stopped. This arrangement permits a material reduction in the speed of the drive shaft at the time it is stopped.
  • the stop motion mechanism includes a pair of cams which are adjustable with respect to one another wherein the distance which the main shaft of the machine rotates between the time in which it is disconnected from the drive pulley and wherein it is abruptly stopped may be readily adjusted.
  • an improved stop motion mechanism which includes two separate control cams which are adjustable relative to each other and which are so related to the remainder of the stop motion mechanism wherein the main drive shaft is permitted to coast between one and one and one-half revolutions before the main drive shaft is abruptly stopped. Further, by providing two cams for controlling the operation of the stop motion mechanism and by making the cams adjustable relative to one another, an adjustment can be made to increase or decrease the coasting time of the drive shaft. This adjustment permits one to compensate for the slight differences in the manufacture and assembling of each machine.
  • FIG. I is a side elevational view, with parts broken away and shown in section, of a sewing machine incorporating the stop motion mechanism of this invention.
  • FIG. 2 is a fragmentary plan view of the base portion of the machine with parts broken away and shown in section and shows the operating means of the stop motion mechanism.
  • FIG. 3 is a fragmetnary elevational view of the other side of the machine from FIG. 1 with parts broken away and shown in section and shows further details of the stop motion mechanism.
  • FIG. 4 is an enlarged exploded perspective view of the stop motion cam assembly.
  • FIG. 5 is an enlarged front elevational view of the assembled stop motion cam discs.
  • FIG. 6 is a fragmentary sectional view taken along the line 6-6 of FIG. I and shows further the details of the cam discs.
  • the machine is generally identified by the numeral 9 and includes a vertical standard 10 having a base portion I] and a sub-base l2. Extending horizontally from the base portion 11 is a work supporting arm 13 which is adapted to carry a conventional looper and thread cutter (not shown). Above the arm 13 and extending horizontally from the upper end of the vertical standard 10 is an overhanging arm 14 which has at its outer end a head portion 15. A needle bar 16, which carries a needle 17, is mounted for vertical reciprocatory movement in the head portion 15.
  • a main shaft 18 is rotatably mounted in the base II and it is to be understood that conventional driving means are provided from the main shaft for operating the needles and looper for performing the desired stitching operation, such as attaching a button to a workpiece.
  • driving means are in no way part of this invention, no attempt has been made to illustrate the same or to further disclose the details thereof here.
  • the main shaft 18 carries an eccentric 19 which is adapted to rock a member 20 back and forth through a suitable are upon each revolution of the main shaft 18.
  • the rocking of member of 20 is an idle rocking and performs no function.
  • the lower end of a link 21 is shifted towards the left into the position shown in FIG. I so that its shoulder 22 is in the path of a laterally extending portion 23 of the member 20.
  • the rocking of member 20 by the eccentric 19 will cause a downward movement of the link 21.
  • the upper end of link 21 is pivotally connected to one arm 24 of a button clamp lifting lever 25 which is pivotally mounted by a stud 26 in the overhanging arm 14.
  • the forwardly extending arm 27 of the lever 25 carries a downwardly extending rod 28, the lower end of which extends laterally and carries a roller 29.
  • the roller 29 is adapted to cooperate with the undersurface of a hookshaped rod 30 secured to a button clamping mechanism 31.
  • the button clamping mechanism is of the same type as that disclosed in aforementioned U.S. Pat. Nos. 2,511,367; 2,609,773 and 3,509,838. It is pivotally mounted on the frame of the machine by a rod 32.
  • the clamping member 31 is normally urged downward during a stitching cycle by a spring 33. When the rod 28 is lifted upwardly and in turn lifts the rod 30, the clamping mechanism 31 will pivot about the rod 32 and lift the button retaining portion thereof away from the work supporting arm 13.
  • the lower end of link 21 Upon starting of the machine, the lower end of link 21 will be moved towards the right (FIG. 1). This is accomplished by the operators action on a foot treadle or knee press (neither shown) which will cause a counter-clockwise rocking movement of a stop motion rock shaft 34 to which is secured an arm 35.
  • the lower end of the arm 35 is pivotally connected to a link 36, the other end of which is pivotally connected to the lower end of the link 21.
  • the rock shaft 34 will be rocked in a clockwise direction (FIG. 1) to return the link 21 to the position shown in FIG. I and thus place the shoulder 22 in the path of the laterally extending portion 23 of the rock member 20.
  • the machine is provided with a stop motion mechanism which represents an improvement on that of the previously mentioned Nelson and Bowin patents.
  • a stop motion plunger lever 37 which is fixedly secured to the stop motion rock shaft 34.
  • the plunger lever 37 carries a plunger rod 38 which, in turn, carries a stop motion plunger 39 at its left end (FIG. 3).
  • a number of spring washers 40 which are carried by the plunger rod 38, bias the stop motion plunger 39 towards the left, as seen in FIG. 3.
  • the plunger lever also carries a lever 41, the free end of which is provided with a camming surface 41a (FIG.
  • the friction clutch includes a clutch disc which is fastened to a stop motion disc 43 which, in turn, is fastened to the main shaft 18.
  • the disc 43 is provided with a pawl 44 and a latch 45 (FIG. 3) which cooperate with the stop plunger 39 in stopping the machine.
  • the plunger 39 is biased towards the stop motion disc 43 by a spring 46 connected at one end to the plunger lever 37 and its other end to the frame of the machine.
  • a lever 47 which carries a cam follower 48, as is best seen in FIGS. I and 2.
  • the cam follower 48 is positioned to engage edges of cam discs 49 and 50 mounted on a cam shaft 51.
  • Disc 49 is fixedly mounted, by a pressed fit, on a hub 52 ofa gear 53.
  • the disc 50 loosely tits on the hub 52 and is provided with a hub 54.
  • the discs 49 and 50 are secured to the cam shaft 51 by screws 55 passing through threaded openings in the hub 54 and elongated openings 56 in the hub 52.
  • a hub 57 which is part of the disc 49, provides for the proper spacing between the discs 49 and 50.
  • An adjustable shoe 58 is located between the discs 49, 50 an is pivotally mounted at one end to disc 50 by a sch: 59.
  • An elongated circumferentially extending hole 591 in the cam disc 49 provides clearance and easy access to the shoulder screw 59.
  • the shoe 58 is secured in one of two positions by a shoulder screw 60 selectively passing through one of two holes 61,6la in the cam disc 50.
  • the cam disc 49 has two peripheral notches 62 and 63 with the notch 62 being defined by steps 64 and 65, and the notch 63 being defined by steps 66 and 67. As is readily apparent from FIGS. 4 and 5, the notches 62 and 63 are identical and are 180 degrees out of phase with the steps 64 and 66 being somewhat deeper than the steps and 67.
  • the disc 50 is also provided with two identical, diametrically opposed cutouts or notches 68 and 69 of a different shape than the notches 62 and 63.
  • the notches 68 and 69 are generally in line with the notches 62 and 63 when the discs 49 and 50 are mounted in position on the cam shaft 51.
  • the diameters of the discs 49 and 50 are equal and in such a relation to the position of the lever 47 that when the cam follower 48 rides on the edges of the discs, the rock shaft 34 is positioned to hold the plunger 39 out of contact with the stop motion disc 43.
  • the shoe 58 blocks or covers notch 63 so that the machine will go through a full cycle or stitch 16 stitches before stopping. This will allow a four hole button to be sewn. If it is desired to sew a two hole button, for example, the shoe will be raised and secured to the disc with the screw 60 passing through hole 61a. With the shoe in this position, the notch 63 will be opened and the machine will be stopped after every eight stitching cycles.
  • the stop motion plunger lever 37 and the cam discs 49 and 50 are in the positions shown in FIGS. 1 and 3.
  • the operator depresses a foot treadle (not shown) which is connected by a chain 70 to a lever 70a pivotally mounted in the sub-base 12 of the machine by means of a bracket 71.
  • the lever 70a pivots in a counter-clockwise direction and stud 72 carried thereby contacts a downwardly extending arm 73 of the plunger lever 37 to pivot the plunger lever in a clockwise direction and remove the plunger 39 thereof from engagement with the stop motion disc 43.
  • the camming surface of the lever 41 acts on the pulley 42 to engage the clutch and thus connect the power driven pulley 42 to the main drive shaft 18 to effect rotation of the drive shaft 18.
  • the lever 47 will be pivoted in a counterclockwise direction to remove the cam follower 48 from the lower step 64 of the notch 62 in the cam disc 49.
  • the machine now begins the sewing cycle with the cam follower riding on the edges of the cam discs 49 and 50.
  • the cam shaft 51 is driven in a clockwise direction by suitable gearing in the base of the ma chine so that the cam discs 49 and 50 rotate at a ratio of one revolution to every 16 revolutions of the main drive shaft 18.
  • the machine continues to be driven by the pulley 42 until the notch 62 of the cam disc 49 approaches the cam follower 48. At this time the cam follower 48 drops from the edge of the cam discs 49, 50 onto step 65 of cam disc 49. This slight drop rotates the rock shaft 34 in a clockwise direction.
  • the stop motion plunger lever 37 is rocked slightly in a counterclockwise direction moving the plunger 39 towards the stop motion disc 43.
  • the lever 41 is rocked enough to cause its camming surface to disengage the pulley 42 from the clutch and main drive shaft l8 of the machine. At this time the machine has about l to T A revolutions remaining in its sewing cycle.
  • the machine, being disengaged from the pulley 42 will merely coast until it is stopped.
  • the position of the plunger 39 at this time is still far enough away from the stopmotion disc 43 to allow the pawl 44 and latch 45 to pass the plunger 39 in a clockwise direction.
  • An advantageous feature of the invention lies not only in the increased coasting time of the machine at the end of a sewing cycle, but also that this coasting time can be adjusted. This can be accomplished by adjusting cam disc 50 in relation to cam disc 49.
  • the cam disc 50 is provided with an elongated circumferential slot 80, as is shown in FIGS. 4 and 5.
  • a screw 81 passes through the slot 80, through a spacing collar 82 and into a threaded bore 83 in the cam disc 49.
  • the screw 81 serves to clamp the cam disc 50 to the cam disc 49 in its adjusted position.
  • the screws 55 also serve to clamp the cam discs 49 and 50 together in addition to securing the cam discs to the cam shaft 51.
  • the cam disc 50 is shown in its extreme counterclockwise position.
  • the distance D in this view, is at its lowest or most decreased setting. In an actual machine, the cam 50 would be about in the center of the adjustment range. In the following discussion of the adjustment of the relative positions of the cam discs 49 and 50, it is to be assumed that the cam disc 50 is in the center position.
  • the distance D By rotating the cam disc 50 in a clockwise direction, the distance D will be increased, and by rotating the cam disc 50 in the opposite direction, the distance D will be decreased. Increasing the distance D will allow the cam follower to drop down to the step 65 sooner, thereby increasing the coasting time of the machine at the end of the machine at the end of the sewing cycle. This will cause the speed of the machine to be decreased further, from that of the previous setting, at the time the machine is stopped. In like manner, in rotating the cam disc 50 in the opposite direciton relative to the cam disc 49, the coasting time of the machine will be decreased and the speed of the machine, at the time it is stopped, will be increased from that of the previous setting.
  • the coasting time of the machine at the end of a sewing cycle can be adjusted from I to 1% revolutions.
  • the shoe 58 will also be rotated. If the shoe 58 must be replaced, the elongated hole 59a will provide access to the screw 59 in any position to which the cam disc has been rotated relative to the cam disc 49. It will, of course, be necessary to remove the cam discs 49 and 50 from the cam shaft 51 in order to replace the shoe 58.
  • the coasting time of the machine can be readily adjusted to compensate for differences in manufactured parts and in assembling the machines.
  • this machine would be adjusted for a shorter coasting time than the machine having low frictional forces.
  • the coasting time may have to be readjusted.
  • a stop motion mechanism for a sewing machine of the type including a main drive shaft, a drive pulley, a clutch for selectively coupling the main drive shaft to the drive pulley for being driven thereby, a stop motion disc carried by the main drive shaft, first lever means for controlling actuation of the clutch, second lever means for interlocking with the stop motion disc for stopping and preventing rotation of the main drive shaft, the improvement residing in rock means for rocking said first and second lever means in unison, said rock means including a cam shaft driven from said main drive shaft at a reduced ratio, a cam carried by said cam shaft for rotation therewith, said cam having a primary surface and adjacent first and second radial steps, a rock lever connected to said first and second lever means for rocking the same and a cam follower carried by said rock lever for riding on said cam primary surface and for sequential engagement with said steps, and said steps being radially spaced from said primary surface distances wherein when said follower engages said first step said first and second levers are rocked a distance sufficient to dis
  • control means is in the form of a second cam having a control step positioned intermediate the ends of said first step.
  • cams have concentric telescoped hubs forming part of said mounting means and screw means carried by an outer one of said hubs passing through an inner one of said hubs securing one of said cams to said cam shaft.
  • each cam has plural sets of said steps, and blocking means associated with at least certain of said sets of steps for selectively rendering the associated set of steps inoperative.
  • said blocking means is in the form of a shoe positioned between said cams, means pivotally mounting one end of said shoe, and means for selectively positioning a second end of said shoe relative to said cams to selectively render said shoe operative and inoperative.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Transmission Devices (AREA)
US509957A 1974-09-27 1974-09-27 Stop motion mechanism for sewing machines Expired - Lifetime US3894500A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US509957A US3894500A (en) 1974-09-27 1974-09-27 Stop motion mechanism for sewing machines
IT48675/75A IT1032361B (it) 1974-09-27 1975-03-18 Perfezionamento nei meccanismi di arresto per macchine per cucure industriali
FR7511256A FR2286227A1 (fr) 1974-09-27 1975-04-10 Dispositif d'arret en deux temps d'une machine a coudre
ES436839A ES436839A1 (es) 1974-09-27 1975-04-22 Un mecanismo de parada para una maquina de coser.
JP50052450A JPS5923835B2 (ja) 1974-09-27 1975-04-30 ミシンの停止機構
GB22203/75A GB1489460A (en) 1974-09-27 1975-05-22 Sewing machines
DE2541378A DE2541378C3 (de) 1974-09-27 1975-09-17 Vorrichtung zum Abstoppen einer Nähmaschine
CA236,333A CA1022009A (fr) 1974-09-27 1975-09-25 Mecanisme d'arret pour abre de commande de machine a coudre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US509957A US3894500A (en) 1974-09-27 1974-09-27 Stop motion mechanism for sewing machines

Publications (1)

Publication Number Publication Date
US3894500A true US3894500A (en) 1975-07-15

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ID=24028790

Family Applications (1)

Application Number Title Priority Date Filing Date
US509957A Expired - Lifetime US3894500A (en) 1974-09-27 1974-09-27 Stop motion mechanism for sewing machines

Country Status (8)

Country Link
US (1) US3894500A (fr)
JP (1) JPS5923835B2 (fr)
CA (1) CA1022009A (fr)
DE (1) DE2541378C3 (fr)
ES (1) ES436839A1 (fr)
FR (1) FR2286227A1 (fr)
GB (1) GB1489460A (fr)
IT (1) IT1032361B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899673A (en) * 1988-03-03 1990-02-13 Brother Kogyo Kabushiki Kaisha Control device for cyclic sewing machine
US5179904A (en) * 1990-07-20 1993-01-19 Juki Corporation Cycle sewing machine
US5460107A (en) * 1993-09-29 1995-10-24 Amf Reece, Inc. Roller activated stop motion mechanism for an eyelet buttonhole machine
US5775239A (en) * 1997-01-06 1998-07-07 Amf Reece, Inc. Double cam drives for a buttonhole sewing machine
US5802999A (en) * 1997-01-06 1998-09-08 Amf Reece, Inc. Stop mechanism for a buttonhole sewing machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2721526A (en) * 1953-10-09 1955-10-25 Singer Mfg Co Stop-motion mechanisms for sewing machines
US2822771A (en) * 1955-09-30 1958-02-11 Singer Mfg Co Sewing machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2721526A (en) * 1953-10-09 1955-10-25 Singer Mfg Co Stop-motion mechanisms for sewing machines
US2822771A (en) * 1955-09-30 1958-02-11 Singer Mfg Co Sewing machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4899673A (en) * 1988-03-03 1990-02-13 Brother Kogyo Kabushiki Kaisha Control device for cyclic sewing machine
US5179904A (en) * 1990-07-20 1993-01-19 Juki Corporation Cycle sewing machine
US5460107A (en) * 1993-09-29 1995-10-24 Amf Reece, Inc. Roller activated stop motion mechanism for an eyelet buttonhole machine
US5775239A (en) * 1997-01-06 1998-07-07 Amf Reece, Inc. Double cam drives for a buttonhole sewing machine
US5802999A (en) * 1997-01-06 1998-09-08 Amf Reece, Inc. Stop mechanism for a buttonhole sewing machine

Also Published As

Publication number Publication date
GB1489460A (en) 1977-10-19
FR2286227A1 (fr) 1976-04-23
IT1032361B (it) 1979-05-30
DE2541378C3 (de) 1980-04-03
JPS5923835B2 (ja) 1984-06-05
JPS5142655A (en) 1976-04-10
DE2541378A1 (de) 1976-04-15
FR2286227B1 (fr) 1980-04-25
DE2541378B2 (de) 1979-07-26
CA1022009A (fr) 1977-12-06
ES436839A1 (es) 1976-12-01

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Owner name: BT COMMERCIAL CORPORATION

Free format text: SECURITY INTEREST;ASSIGNOR:UNION SPECIAL CORPORATION;REEL/FRAME:004610/0215

Effective date: 19851220

Owner name: BT COMMERCIAL CORPORATION, STATELESS

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Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:BT COMMERCIAL CORPORATION;REEL/FRAME:004754/0102

Effective date: 19870707