US3693564A - Control mechanism for sewing machine - Google Patents

Control mechanism for sewing machine Download PDF

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Publication number
US3693564A
US3693564A US138979A US3693564DA US3693564A US 3693564 A US3693564 A US 3693564A US 138979 A US138979 A US 138979A US 3693564D A US3693564D A US 3693564DA US 3693564 A US3693564 A US 3693564A
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United States
Prior art keywords
control
sewing machine
machine
bell crank
control mechanism
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Expired - Lifetime
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US138979A
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English (en)
Inventor
James C Hsiao
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Union Special Machine Co
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Union Special Machine Co
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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
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B1/00—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both
    • D05B1/24—General types of sewing apparatus or machines without mechanism for lateral movement of the needle or the work or both for making blind-stitch seams
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B85/00—Needles
    • D05B85/06—Curved needles

Definitions

  • ABSTRACT This disclosure relates to a control mechanism for a blindstitch tacker wherein a single control device is provided for progressively moving a node former and work clamp of a sewing machine into clamping engagement with a workpiece, and further movement of the control mechanism results in the initiation of the stitching operation.
  • the control mechanism includes a multiple lever arm bell crank with different ones of the lever arms thereof actuating different mechanisms of the sewing machine.
  • the control mechanism also includes a cam and cam follower for actuating the node former and work clamp with there being an overcenter position wherein further movement of the bell crank does not result in further movement of the node former and work clamp.
  • a spring retains the bell crank in its operative position without assistance by the operator.
  • the control mechanism is automatically returned to its inoperative position upon the termination of a predetermined sewing cycle.
  • This invention relates in general to new and useful improvements in sewing machines, and more particularly to a control mechanism for a blindstitch tacker.
  • the Mueller, et al. patent discloses a blindstitch tacker which includes a node former and work clamp which is positioned by an operator depressing a foot treadle and moving acontrol lever therefor.
  • the sewing machine of the Mueller, et al. patent also discloses a stop motion control mechanism which is provided with an independent control lever and operated by means of a second treadle.
  • a principal feature of the control mechanism is the provision of a multiple lever arm bell crank wherein one lever arm is utilized to effect the operator controlled pivoting of the bell crank and two other lever arms are utilized to independently control the movement of two separate actuating mechanisms of the sewing machine.
  • the control mechanism is further constructed wherein after a predetermined stitching sequence has been performed, a stop motion mechanism of the sewing machine will be reset and in the resetting of the stop motion mechanism, the control mechanism will be returned to its normal inoperative position independently of any function on the part of the machine operator.
  • the control mechanism is particularly adapted for incorporation in a blindstitch tacker, but may be utilized in conjunction with any type of sewing machine which requires two separate operations on the part of the operator and is particularly adapted for use in conjunction with sewing machines which are programmed to form a predetermined number of stitches upon each actuation thereof.
  • FIG. 1 is a rear elevational view of the sewing machine with parts broken away and showing the control mechanism in its operative position.
  • FIG. 2 is a rear elevational view similar to FIG. 1 but with the control mechanism in its operative position.
  • FIG. 3 is a side elevational view of the sewing machine with parts broken away and shown in section and showing the connection between the control mechanism and sewing machine mechanism.
  • FIG. 4 is a vertical sectional vieyv taken along the line 4-4 of FIG. 3 and shows further the details of the sewing machine.
  • FIG. 3 includes a section 9 that directly rests on the base 6 and has a horizontal arm 10 extending therefrom.
  • An upright post 11 is secured to the section 9 and, in turn, supports a horizontal arm 12 which extends from the upper end of the post 11. Remote from the post 11, the arm 12 carries a needle head 13 which extends downwardly towards the arm 10.
  • the needle head 13 is of a conventional type and the lower portion thereof is provided with a needle arm 14 whichcarries a needle 15.
  • the needle head 13 also supports a rotary looper 16 which cooperates with the needle to form stitches.
  • the needle head 13 also carries a presser foot 17 which is disposed below the needle 15 and the looper 16.
  • a circular work support plate 18 is rigidly'securecl to the arm 10 in a conventional manner.
  • a hole 20 is provided in the center of the work support plate 18 through which a node former 21 and a work clamp 22 are able to pass.
  • the hole 20 is larger in diameter than the work clamp 22 so that the work clamp is allowed free movement.
  • the work clamp 22 and the node former 21 are illustrated in their down or inoperative position. In this position the top surface of the work clamp and node former lie in substantially the same plane as the top surface of the work support plate 18.
  • the work clamp 22 is slidably mounted on a shaft portion 23 of the node former 21 with a spring 24 surrounding the shaft portion 23 and biasing the work clamp 22 upwardly. Upward movement of the work clamp 22 relative to the node former 21 is limited by engagement of a shoulder on the work clamp against an under shoulder on the node former at
  • the shaft portion 23 is slidably mounted in a node former frame 26 and has a reduced shaft portion 27 which passes out through the bottom of the node former frame 26. Stop nuts 28 are threadedly engaged on the exposed end of the of the shaft portion 27 and restrict the upward movement of the node former 21 relative to the node former frame 26.
  • the node former 21 is biased upwardly by a spring 30 disposed around the shaft portion 27 and reacting against the lower end of the shaft portion 23 and a shoulder defined by the base of a cylindrical recess 31 in the node former frame 26 in which the shaft portion 23 is slidably mounted.
  • the node former frame 26 includes a barrel portion 32 which is slidably mounted in a node former bearing block 33.
  • the node former frame which carries the node fonner and the work clamp, is movable up and down in the node former bearing block by means of a link 34 which is pivotally connected at one of its ends to the node former frame and at its other end to a node former crank 35 by means of shoulder screws 36.
  • the node former crank 35 is adjustably secured to a node former shaft 37 for oscillation therewith. It is to be understood that the specific details of the adjustable connection between the node former crank 35 and the shaft 37 are not a part of this invention and therefore, are not described in detail although they differ somewhat from that disclosed in the aforementioned Mueller, et. al. patent.
  • the node former shaft 37 is suitably mounted at one end in bearings 38 and 40 carried by the machine frame. The opposite end of the shaft 37 is suitably mounted in a bearing (not shown) carried by the node former bearing block 33.
  • the bearing block 33 is suitably rigidly secured to the arm 10 by means of screws or other fasteners in a manner not illustrated here in that it forms no part of this invention.
  • An arm 43 is secured to the shaft 41 and is connected by means of a link 44 to one arm 45 of a lever 46.
  • the lever 46 is, in turn, secured to the shaft 37 for effecting the oscillation thereof.
  • the lever 46 includes a further arm 47 which engages the hub of the arm 43 and functions as a stop for the purpose of stopping the node former in the correct up position thereof so as to present a ridge of the work up through a slot (not shown) in the presser foot 17 and into the path of the needle 15.
  • the lever 42 is operatively connected with a lever 48.
  • the lower portion of the lever 48 is provided with an opening 50 of which a portion thereof is defined by a cam surface 51 which terminates in a restricted portion 52 of the opening 50.
  • the free end of the lever 42 is provided with a cam follower 53 which is disposed within the opening 50 and which is in engagement with the cam surface 5]. It is also to be noted that the cam follower 53 is of a diameter to be received within a restricted opening portion 52 with there being a minimum of play.
  • the lever 48 is one arm of a bell crank generally identified by the numeral 54 and includes a hub 55 which is freely pivotable on a shaft 56 which is carried by the upright post 11 and extends therebeyond.
  • the bell crank 54 also includes a lever arm 57 which extends to the right of the pivot point for the bell crank 54, as viewed in FIG. 1.
  • the lever arm 57 has a chain 58 connected thereto with the chain 58 depending therefrom.
  • the other end of the chain 58 is connected in a conventional manner to a foot treadle (not shown) or other suitable actuating means.
  • a spring 60 is connected at one end to the lever arm 57 and at its opposite end to a lever arm 61 which is integrally connected with the lever 42 and together therewith to form a bell crank 62.
  • the spring 60 constantly urges the bell crank 54 in a clockwise direction and the ball crank 62 in a counterclockwise direction thereby maintaining contact between the cam follower 53 and the cam surface 51.
  • the bell crank 54 includes a third lever arm 63 which terminates in a right angle portion 64.
  • the right angle portion 64 has adjustably threadedly engaged therein an adjustable stud 65 which is locked in an adjusted position by means of a lock nut 66.
  • the stud 65 will engage a stop motion lever 67 and pivot the same in a clockwise direction to a released position.
  • the stop motion mechanism will not be discussed in detail here in that the specific details thereof are not a part of this invention. It is to be understood, however, that the mechanism will be comparable to that shown in the Mueller, et al. U.S. Pat. No. 2,889,793 and more specifically disclosed in the patent to Nelson, U.S. Pat. No. 2,609,773 referred to therein.
  • the stop motion lever 67 will have been pivoted a limited amount in a clockwise direction and a stop element 68 thereof will be released from abutment with a shoulder 70 of a pulley 71 which is secured to a mainshaft 72 of the sewing machine.
  • a conventional clutch (not shown) in the pulley 71 will be engaged and the sewing machine will start its sewing cycle.
  • the operator can now release the chain 58 because the bell cranks 54 and 62 will remain locked in position by the tension of the spring 60 and the seating of the cam follower 53 into the narrow opening portion 52. It is understood that the material will be kept clamped in the desired position throughout the sewing cycle.
  • the length of the sewing cycle is determined by a conventional stitch cam arrangement 73.
  • the cam 73 is secured to a shaft 74 which is mounted for rotary motion in suitable hearings in the machine frame.
  • the cam 73 is provided with three sets of notches which determine the number of stitches of the sewing cycle.
  • the stitch setting can be changed by a stitch adjusting lever 75 which is fixed to the shaft 56.
  • the stitch adjusting mechanism in of itself is not a part of this invention and is fully explained in the aforementioned Mueller, et al. US. Pat. No. 2,889,793.
  • a gear ratio of 24:1 is accomplished by a worm 76 fixed to the main shaft 72 and cooperating with a worm gear 77 fixed to a traverse shaft 78;
  • a further gear 80 also fixed to the traverse shaft 78, meshes with a gear 81 fixed to the shaft with the end result being that for every twenty four revolutions of the main shaft 72, the cam 73 will revolve only once.
  • the cam 73 is provided with three different sets of notches, one set of notches including two notches for the purpose of forming 12 stitches during a sewing cycle: another set of notches including three notches for forming eight stitches during a sewing cycle: and the third set of notches including four notches for forming six stitches during a sewing cycle.
  • the stitch adjusting lever 75 has an upstanding arm portion 82 which carries a cam follower 83.
  • the cam follower 83 rests in one of the notches or depressions of the cam 73.
  • the chain 58 is tensioned fully to start the operation of the sewing machine, the cam follower 83 is lifted out of the respective notch in the cam 73 and then rides on the surface of the cam 73 as the cam rotates during the operation of the sewing machine.
  • the cam follower 83 reaches the next notch, it drops into the notch followed by a resultant rocking of the shaft 56.
  • the cam follower 83 is constantly biased towards the cam 73 by a spring 84 which has one end thereof anchored on a pin 85 projecting from the machine frame and the other end thereof engaged with the stop motion lever 67.
  • the shaft 56 is rotated in a counterclockwise direction as viewed in FIGS. 1, 2 and 4 with the result that the stop motion lever 67 also moves in a counterclockwise direction with the stop element 68 thereof engaging the pulley 71 and stopping rotation of the main shaft 72.
  • Movement of the stop motion lever 67 in a counterclockwise direction will also result in rotation of the bell crank 54 in a counterclockwise direction sufficiently for the cam follower 53 to move out of the narrow opening portion 52 to a position wherein the lever arms 42 and 48 are no longer interlocked and wherein the spring 60 will now cause the bell cranks 54 and 62 to return to their original positions.
  • an adjustable stop 86 is provided in the machine frame for engagement with the lever arm 42 to limit the pivoting of the lever arm 42 in a counterclockwise direction due to the urging of the spring 60.
  • the coaction of the cam surface 51 with the cam follower 53 will limit the pivoting of the lever arm 48 in a clockwise direction due to the urging of the spring 60.
  • the sewing machine may be equipped with a conventional thread wiper and a conventional thread cutter (not shown).
  • a conventional thread wiper and a conventional thread cutter (not shown).
  • FIG. 4 it will be seen that there is mounted within the upright post 11 a vertically extending link 87.
  • the link 87 is provided at the upper end thereof with a vertically elongated slot 88 through which the main shaft 72 passes.
  • the lower end of the link 87 is connected to an arm or lever 90 which is rigidly secured to the shaft 41.
  • the link 87 has associated therewith control mechanisms 91 for the thread wiper and thread cutter which are actuated in response to vertical movement of the link 87.
  • the shaft 41 is oscillated by means of the bell crank 62 in positioning the node former 21 and the work clamp 22 and that simultaneous with the positioning of the node former and the work clamp, the link 87 is shifted so as to control the operation of the thread wiper and thread cutter.
  • control mechanism has been specifically illustrated for use in conjunction with a 'blindstitch spot tacker, the invention is not limited to such a sewing machine installation, but may be used in conjunction with other types of group stitch machines. ltwill be readily recognized from the foregoing that the principal feature of the invention is the provision of a single operator controlled mechanism which has a first range of movement to effect the clamping of work in place for stitching, and a further range of movement for effecting the operation of the sewing machine to form the desired predetermined stitching.
  • a single control mechanism for actuating said first and second controls in sequence, said control mechanism including first means for operation by an operator and second and third means operable in unison by and with said first means, first connecting means between said second means and said first control for actuating said first control during a first movement of said first means, and second connecting means between said third means and said second control for actuating said second control during a second movement of said first means and after the actuation of said first control.
  • said first connecting means includes a lost motion connection operable only after said first control has been actuated for facilitating the actuation of said second control whereby said second control may be actuated without influencing the position of said first control.
  • sewing machine of claim 4 wherein said sewing machine includes release mechanism operable in timed response to the actuation of said second control to over ride said interlock means and release said con trol mechanism.
  • said sewing machine includes a rockable shaft and said first, second and third means including a multiple arm crank pivotally mounted on said shaft, said second control being fixedly secured to said shaft for rocking the same in response to the actuation of said second control, and a stitch number control member carried by said shaft.
  • interlock means is resilient and said resilient urging of said stitch number control member is sufficient to overcome said interlock means and move said second and third means to normal positions wherein said first and second controls are in the normal positions thereof for the inoperative position of said sewing machine.
  • a group stitch sewing machine having a sequential control mechanism operated by single control means, said sewing machine including a work clamp and a machine control device, and said single control means including a multiple lever arm bell crank having an operator controlled lever arm and a pair of machine controlling lever arms, fist linkage connecting one of said machine controlling lever arms to said work clamp for moving said work clamp to a work clamping position upon initial movement of said operator controlled lever arm, and second linkage connecting the other of said machine controlling lever arms to said machine Control device for moving said machine control device to a machine operating position upon further movement of said operator controlled lever arm.
  • sewing machine of claim 11 wherein said sewing machine is a blindstitch spot tacker and includes a node former associated with said work clamp for movement therewith to an operative position.
  • said first linkage includes an actuating lever, and a cam and cam follower connection between said actuating lever and said one machine controlling lever arm.
  • said machine control device includes means for resetting said bell crank after the forming of a preselected number of stitches.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US138979A 1971-04-30 1971-04-30 Control mechanism for sewing machine Expired - Lifetime US3693564A (en)

Applications Claiming Priority (1)

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US13897971A 1971-04-30 1971-04-30

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US3693564A true US3693564A (en) 1972-09-26

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US138979A Expired - Lifetime US3693564A (en) 1971-04-30 1971-04-30 Control mechanism for sewing machine

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US (1) US3693564A (de)
DE (1) DE2218038A1 (de)
FR (1) FR2136820A5 (de)
GB (1) GB1392873A (de)
IT (1) IT952740B (de)

Cited By (3)

* 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
US5802999A (en) * 1997-01-06 1998-09-08 Amf Reece, Inc. Stop mechanism for a buttonhole sewing machine
US20040113450A1 (en) * 2002-07-24 2004-06-17 Fielding Russell C. Integrated step for a vehicle cargo area

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2540730A (en) * 1948-10-07 1951-02-06 Singer Mfg Co Operation servo control for groupstitch sewing machines
US2609773A (en) * 1942-12-10 1952-09-09 Lewis Invisible Stitch Machine Thread handling mechanism for sewing machines
US2764112A (en) * 1954-04-26 1956-09-25 Singer Mfg Co Power operated control units for sewing machines
US2889793A (en) * 1952-07-25 1959-06-09 Union Special Machine Co Sewing machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2609773A (en) * 1942-12-10 1952-09-09 Lewis Invisible Stitch Machine Thread handling mechanism for sewing machines
US2540730A (en) * 1948-10-07 1951-02-06 Singer Mfg Co Operation servo control for groupstitch sewing machines
US2889793A (en) * 1952-07-25 1959-06-09 Union Special Machine Co Sewing machine
US2764112A (en) * 1954-04-26 1956-09-25 Singer Mfg Co Power operated control units for sewing machines

Cited By (4)

* 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
US5802999A (en) * 1997-01-06 1998-09-08 Amf Reece, Inc. Stop mechanism for a buttonhole sewing machine
US20040113450A1 (en) * 2002-07-24 2004-06-17 Fielding Russell C. Integrated step for a vehicle cargo area
US6857680B2 (en) * 2002-07-24 2005-02-22 Daimlerchrysler Corporation Integrated step for a vehicle cargo area

Also Published As

Publication number Publication date
IT952740B (it) 1973-07-30
FR2136820A5 (de) 1972-12-22
GB1392873A (en) 1975-05-07
DE2218038A1 (de) 1972-11-02

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