US2811940A - Looper control for sewing machines - Google Patents

Looper control for sewing machines Download PDF

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Publication number
US2811940A
US2811940A US586096A US58609656A US2811940A US 2811940 A US2811940 A US 2811940A US 586096 A US586096 A US 586096A US 58609656 A US58609656 A US 58609656A US 2811940 A US2811940 A US 2811940A
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Prior art keywords
rod
looper
sewing machines
path
axis
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Expired - Lifetime
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US586096A
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Marforio Nerino
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Virginio Rimoldi and Co SpA
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Virginio Rimoldi and Co SpA
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/06—Loop takers, e.g. loopers for overedge-stitch sewing machines

Definitions

  • This invention relates to a control device for rocking loopers for sewing machines.
  • a further purpose of this invention is to provide a control device of the type referred to, which is simpler and less expensive in construction than devices presently 1n use.
  • the improved looper control device for sewing machines comprises a rod to one end of which a looper is secured, means for causing the other end of said rod to rock over an arcuated path and a slideway for the rod freely rotatable about an axis perpendicular to the rod axis and intersecting the latter.
  • Figure 1 is a diagrammatical front view of the control device
  • Figure 2 is an end view of Figure l on a smaller scale, the device being tted to the sewing machine.
  • the looper 1 is mounted on the end of a rod 2 hinged by a pin 3 to a lever 4 rocking about a pivot 5.
  • the rod 2 is capable of sliding in a guideway 9 pro vided with an extension 9a, the axis of which intersects the rod axis, said extension 9a being rotatable in a bearing 10 secured by means of a set screw 11 in a recess 12a in the frame 12 of the sewing machine.
  • the end of the lever 4 remote from the hinge pin 3 is formed with a spherical head 6 engaged by a spherical recess in a connecting rod 7 driven in a known manner by a crankshaft 8.
  • the tip 1a of the looper travels over a path comprising a first portion denoted 17 comparable with an arc of a circumference of a large radius, the chord 18 of the are 17 being at an angle of about 17 to the line 19 parallel with the path 16 of the needle tip.
  • the second portion of the path of the looper tip is denoted by 20 and is comparable with an arc of a circle having its centre at 21 slightly beneath the plane 15 of the cloth plate and spaced by an extent A from the path of the needle tip smaller than the spacing B between said path and the looper bit where the latter extends through the plane of the cloth plate.
  • a device for controlling a looper comprising a rod supporting at its upper end the looper secured thereto, a tubular guideway for slidably supporting said rod, a cylindrical extension on said guideway extending perpendicularly thereto and with its axis intersecting the axis of said rod, a bearing secured to the frame for rotatably supporting said extension, a pin at the lower end of said rod having its axis parallel to that of said cylindrical extension but being provided at the opposite side of the rod, a rocking lever arranged in a plane parallel to the plane in which lies the axis of said rod, a pivot fast with the machine frame for rockingly supporting said lever at a point intermediate the ends of the latter, a driving crankshaft arranged with its axis perpendicular to the direction of the axis of said pivot, a connecting rod interposed

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Description

NOV- 5, 1957 N. MARFoRlo 2,811,940
LOOPER CONTROL FOR SEWING MACHINES Filed May 21, 195e United States Patent O LOOPER CONTROL FOR SEWING MACHINES Nerino Marforio, Milan, Italy, assignor to S. p. A. Virginio Rimoldi & C., Milan, Italy Application May 21, 1956, Serial No. 586,096
Claims priority, application Italy October 13, 1955 1 Claim. (Cl. 112-192) This invention relates to a control device for rocking loopers for sewing machines.
It is a purpose of this invention to provide a looper control device which causes the looper bit to travel Over a path adapted to improve the sewing operation.
A further purpose of this invention is to provide a control device of the type referred to, which is simpler and less expensive in construction than devices presently 1n use.
The improved looper control device for sewing machines comprises a rod to one end of which a looper is secured, means for causing the other end of said rod to rock over an arcuated path and a slideway for the rod freely rotatable about an axis perpendicular to the rod axis and intersecting the latter.
The invention shall be described by way of example with reference to the accompanying drawings, wherein:
Figure 1 is a diagrammatical front view of the control device;
Figure 2 is an end view of Figure l on a smaller scale, the device being tted to the sewing machine.
The looper 1 is mounted on the end of a rod 2 hinged by a pin 3 to a lever 4 rocking about a pivot 5.
The rod 2 is capable of sliding in a guideway 9 pro vided with an extension 9a, the axis of which intersects the rod axis, said extension 9a being rotatable in a bearing 10 secured by means of a set screw 11 in a recess 12a in the frame 12 of the sewing machine.
A washer 13 held in position by means of a screw 14 axially screwed into the extension 9a prevents removal of the extension 9 from the bearing.
The end of the lever 4 remote from the hinge pin 3 is formed with a spherical head 6 engaged by a spherical recess in a connecting rod 7 driven in a known manner by a crankshaft 8.
15 denotes the plane of the cloth plate, 16 the path of the needle tip.
2,811,940 Patented Nov. 5, 1957 With the size and arrangement of the component parts shown on the drawing, the tip 1a of the looper travels over a path comprising a first portion denoted 17 comparable with an arc of a circumference of a large radius, the chord 18 of the are 17 being at an angle of about 17 to the line 19 parallel with the path 16 of the needle tip.
The second portion of the path of the looper tip is denoted by 20 and is comparable with an arc of a circle having its centre at 21 slightly beneath the plane 15 of the cloth plate and spaced by an extent A from the path of the needle tip smaller than the spacing B between said path and the looper bit where the latter extends through the plane of the cloth plate.
What I claim is:
In a sewing machine comprising a frame, a needle reciprocated over a rectilinear path, a cloth plate supporting the work through which the needle path extends, and loopers, a device for controlling a looper comprising a rod supporting at its upper end the looper secured thereto, a tubular guideway for slidably supporting said rod, a cylindrical extension on said guideway extending perpendicularly thereto and with its axis intersecting the axis of said rod, a bearing secured to the frame for rotatably supporting said extension, a pin at the lower end of said rod having its axis parallel to that of said cylindrical extension but being provided at the opposite side of the rod, a rocking lever arranged in a plane parallel to the plane in which lies the axis of said rod, a pivot fast with the machine frame for rockingly supporting said lever at a point intermediate the ends of the latter, a driving crankshaft arranged with its axis perpendicular to the direction of the axis of said pivot, a connecting rod interposed between the crank of said crankshaft and the end of said rocking lever remote from said rod, a spherical head on said end of the rocking lever, and a spherical recess at the end of said connecting lever opposite the crankshaft for engaging said spherical head, the other end -Of said rocking lever being hinged on said pin provided at the lower end of said rod.
References Cited in the le of this patent UNITED STATES PATENTS 2,718,859 zeier sept. '27, 1955 FOREIGN PATENTS 467,956 Germany Nov. 5, 1928 659,796 Germany May 11, 1938
US586096A 1955-10-13 1956-05-21 Looper control for sewing machines Expired - Lifetime US2811940A (en)

Applications Claiming Priority (1)

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IT2811940X 1955-10-13

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670677A (en) * 1969-09-25 1972-06-20 Tokyo Juki Industrial Co Ltd Looper drive mechanism
US3952674A (en) * 1973-11-16 1976-04-27 Juki Co., Ltd. Method and apparatus for adjusting the looper operation locus of a sewing machine
US4022140A (en) * 1975-02-06 1977-05-10 Veb Nahmaschinenwerk Wittenberge Looper drive device for a stitching machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE467956C (en) * 1926-05-26 1928-11-05 Union Special Maschinenfab Chain stitch sewing machine with a rotating gripper and a loop deflector
DE659796C (en) * 1937-01-23 1938-05-11 Moenus Maschf Lockstitch footwear sewing machine
US2718859A (en) * 1951-10-17 1955-09-27 Singer Mfg Co Looper spreader mechanisms for sewing machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE467956C (en) * 1926-05-26 1928-11-05 Union Special Maschinenfab Chain stitch sewing machine with a rotating gripper and a loop deflector
DE659796C (en) * 1937-01-23 1938-05-11 Moenus Maschf Lockstitch footwear sewing machine
US2718859A (en) * 1951-10-17 1955-09-27 Singer Mfg Co Looper spreader mechanisms for sewing machines

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3670677A (en) * 1969-09-25 1972-06-20 Tokyo Juki Industrial Co Ltd Looper drive mechanism
US3952674A (en) * 1973-11-16 1976-04-27 Juki Co., Ltd. Method and apparatus for adjusting the looper operation locus of a sewing machine
US4022140A (en) * 1975-02-06 1977-05-10 Veb Nahmaschinenwerk Wittenberge Looper drive device for a stitching machine

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