US1151768A - Presser-foot mechanism for sewing-machines. - Google Patents

Presser-foot mechanism for sewing-machines. Download PDF

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US1151768A
US1151768A US663940A US1911663940A US1151768A US 1151768 A US1151768 A US 1151768A US 663940 A US663940 A US 663940A US 1911663940 A US1911663940 A US 1911663940A US 1151768 A US1151768 A US 1151768A
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presser foot
arm
spring
presser
work
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US663940A
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Edward Erickson
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VICTOR SHOE MACHINERY CO
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VICTOR SHOE MACHINERY CO
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Priority claimed from US64476911A external-priority patent/US1138858A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B15/00—Machines for sewing leather goods

Definitions

  • This invention relates to machines for sewing heavy material such as leather, and refers particularly to the mechanism for controlling the presser foot of that type known as welt sewing machines.
  • the object of the invention is to provide an improved mechanism which will effect the lockingof the presser foot to hold the work tightly during the formation of each stitch, and to release it during the feed of the work.
  • Figure 1 is front elevation of the machine complete.
  • Fig. 2 is an el vation from the left of Fig. 1.
  • Fig. 3 is an elevation from the right of Fig. 1.
  • Fig. 4 represents a section on line 4-lof Fig. 1, and Fig. represents a detail, partly in section on line 5-5 of Fig. e.
  • the base 30 is formed or provided with two uprights or standards 31, 32, having bearings for a lower main or drive shaft 33 and an upper counter shaft 37 and a fixed shaft 38 on the latter of which are mounted certain parts for operating the shuttle 53.
  • the main shaft has a pulley 34: for a power driving belt, and has a crank 35 intermediate its ends, to which crank is connected one end of a pitman 36 for actuating the awl 137 and needle 121 said awl and needle in their movements being adapted to pass through a slot 66 in the work support 67 with which a presscr foot 71 coacts.
  • the work presser comprises an arm 71 having a foot 72 (Figs. 1, 2, 3 and 1) to bear on the work supported by arm 67, said arm having a hub 73 mounted on a stud 74 supported by standard 32.
  • An arm 75 projecting rearwardly from the hub 7 3 is provided with a toothed segment 76 which meshes with a pinion 77 (Fig. 1-) fast on rock shaft 78.
  • 2-Secured to arm 75 is a segment rack 86, meshing with a pinion 87 having a sleeve hub 88 mounted on a crank or wrist pin 89 (see Fig. 5 in connection with 4:) of a stud rock shaft 90 mounted in standard 32 and carrying an arm 91 at its outer end.
  • the arm 91 has a roll 92 engaging a cam groove 93 in a disk 94 secured to shaft 33,' said cam groove being indicated by dotted lines in Fig. 1.
  • a collar 95 On the wrist pin at the outer end of sleeve hub 88, is a collar 95 havinga ratchet-toothed outer end face 96 engaged by a pin 97 projecting from said wrist pin.
  • a spring 98 is coiled around, and has its ends connected to, the collar and hub so as to constitute a yielding connection between said two members and consequently to cause the presser foot to bear yieldingly on the work with a pressure that may be varied adjusting the collar rotatively the desired adjustment being maintained by the pin 97 engaging one of the end teeth of the collar. Such yielding pressure however ceases when the awl is penetrating tie work.
  • awl I provide means for preventing rotation of the pinion 87 at the proper time.
  • Mounted on the hub 88 are two collars 99 and/100, said collars inclosing a spring 101 which snugly fits the hub and has its two ends connected to the two collars so that relative rotation of the collars will tighten the spring on the hub to act as a clutch brake on the latter, or release it;
  • the collar 99 has an arm 102 provided with a slot which receives a fixed pin 103, whereby said collar is prevented from rotating although it presents no obstruction to the lateral movement of the pinion hub 88 when the wrist pin is shifted.
  • the other collar 100 has an arm 101 connected by a link 105 with a lever 106 fulcrumed on a stud 107 and having a roll 108 engaging a cam groove 109 in disk 9 1.
  • This arm 101 is moved downwardly by the cam groove 109 when it is desired to tighten the brake spring.
  • Pivoted to the lever 106 at 110 is an arm 111 having a roll 112 engaging the outer surface of the rib which forms the outer wall, of cam groove 109.
  • the other end of the arm.111 is formed or provided with a yoke 113 which embraces an eccentriclla (see dotted lines in Fig.
  • the hub 73 of the presser foot arm or leverris provided with an arm 118 having a pin 119 which projects across the top of bar 117.
  • the action on arm, 118 is such as to raise the presser foot 72.
  • the arm 115 is actuated so as to rock the eccentric 114C and swing arm 111 to throw the roll 112 out wardly and then as the cam disk 94; rotates, a recess 120 in the inner wall of cam groove 109 comes to a position opposite roll 108 so as to relieve outward pressure on said roll and thus release the braking effect of spring 101 and permit the presser foot to be lifted by the further upward movement of bar 117.
  • WVhen the bar 117 is lowered again, a projection 117 (Fig. 4:) therefrom engages the studat-the outer end of arm 115 and insures the return of said stud into the notch 116.
  • the sleeve hub,,88 is eccentric to the axis of stud 90 which carries arm 91, movement of arm 91 toward said position swings said hub 88 laterally.
  • the brake spring 101 is holding pinion 87 locked so that the said lateral movement of the pinion 87 acts through the rack 86 to oscillate the arm 75 and raise the foot 72 slightly but positively, so that the work can be fed freely by the awl.
  • a spring 101 is coiled upon the hub 88 of pinion 87 in such direction that, as it is tightened to apply a braking action, it tightens in such direction as to add its force to that of spring 98, which latter spring causes the presser foot to bear yieldingly upon the work.
  • This additional force applied to the presser foot by the tightening of the spring 101 is due to the increased frictional contact of said spring with the periphery of the hub 88 which tends to rotate said hub in the direction that the spring 101 is being wound, this direction corresponding to the direction that the tension of the spring98 acts.
  • This additional pressure continues to be increased until the arm 10-1 comes to a rest at the end of its downward movement.
  • Presser foot mechanism'for sewing machines comprising in combination a lever having a presser foot and a segment rack, a pinion meshing with said rack, means for yieldingly actuating the pinion to cause the foot of said lever to bear yieldingly on the work after the completion of the feed, means for holding the lever rigidly during other operations, means for positively lifting the presserfoot during each feed operation, ,a manually operable presser-foot lifter, and connections for releasing the lever holding means when said manually operablelifter is actuated.
  • Presser foot mechanism for sewing machines comprisingin combination a lever having a presser foot and a segment rack, a pinion meshing with said rack, means for yieldingly actuating the pinion to cause the foot of said lever to bear yieldingly on the work after the completion of the feed, a brake device to hold the lever rigidly at predetermined times, means for positively lifting the presser foot during each feed operation, means for bringing said brake device into operation when the awl is penetrating the work, a manually operable presser-foot lifter, and connections for releasing the brake when said manually operable lifter is actuated.
  • Presser foot mechanism for sewing machines comprising in combination a lever having a presser foot, a toothed segment carried by said lever, a pinion in permanent engagement with said segment and provided with a lateral hub, a spring for yieldingly opposing rotation of said pinion in one direction, a brake spring coiled on the hub of said pinion, and means for intermittently tightening said brake spring, consisting in part of two collars loosely mounted on said hub and to each of which an end of said spring is connected.
  • Presser foot mechanism for sewing machines comprising in combination a lever having a presser foot, a toothed segment carried by said lever, a stud having a sleeve mounted on it, said sleeve having a pinion in permanent engagement with said segment, a collar adjustably mounted on said stud, a brake spring coiled on the hub of said pinion, and means for intermittently tightening said brake spring.
  • Presser foot mechanism for sewing machines comprising in combination a lever having a presser foot, a toothed segment carried by said lever, a stud shaft having a crank pin, a sleeve mounted on said crank pin and having a pinion engaging said segment, a spring for yieldingly opposing rotation of the sleeve and pinion, an arm con- &
  • Presser foot mechanism for sewing machines comprising in combination a lever having a presser foot, a toothed segment carried by said lever, a crank-mounted stud having a sleeve mounted on it, said sleeve having a pinion engaging said segment, brake mechanism for positively preventing rotation of the sleeve in either direction at predetermined times, and means for intermittently changing the position of the crank-mounted stud.
  • Presser foot mechanism for sewing machines comprising in combination a lever having a presser foo-t, a toothed segment carried by said lever, a stud having asleeve mounted on it, said sleeve having a pinion engaging said segment, two collars mounted on said sleeve, a spring surrounding the sleeve and having its ends connected to the two collars, and means for actuating one of said collars to tighten the spring on the sleeve and prevent its rotation at predetermined times.
  • Presser foot mechanism for sewing machines comprising in combination a lever having a presser foot, a toothed segment carried by said lever, a crank-mounted stud having a sleeve mounted on it, said sleeve having a pinion engaging said segment,
  • brake mechanism for positively preventing rotation of the sleeve in either direction at predetermined times, means for intermittently changing the position of the crankmounted stud, and means for manually relfeasing the brake and lifting the presser oot.

Description

E. ERICKSON.
PRESSER FOOT MECHANISM FOR SEWING MACHINES.
APPLICATION FILED DEC. 4. 1911. RENEWED FEB. 18,1915.
1 1 5 1 ,768. Patented Aug. 31; 1915.
4 SHEETS-SHEET I.
mm WW $23.
' COLUMBlA PLANOORAPH co, WASHINGTON, n. c.
E. ERICKSON. PRESSER FOOT MECHANISM FOR SEWING MACHINES. APPLICATION man 1150.4.1911. gzmawan FEB. 18,1915.
1.15138 Patented Aug. 31, 1915.
-4 SHEETS-SHEET 2.
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coLummA PLANDGRAPH CD4, WASHINGTON, n. c.
E. ERICKSON.
PRESSER FOOT MECHANISM FOR SEWING MACHINES.
APPLICATION FILED DEC. 4. I91I. RENEWED FEB. I8, I915.
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E. ERICKSON.
PRESSER FOOT MECHANISM FOR SEWING MACHINES.
APPLICATION FILED DEC. 4. I911.
RENEWED FEB. 18,!915.
lmvemiaarz 6 $5 es W TTTED STATES EDWARD ERICKSON,
OF WEST LYNN, MASSACHUSETTS, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO VICTOR SHOE MACHINERY COMPANY, OF BOSTON, MASSA- CHUSETTS, A CORPORATION OF MASSACHUSETTS.
PRESSER-FOOT MECHANISM FOR- SEWING-MACHINES.
Original application filed August 18, 1911, Serial No. 644,769.
Specification of Letters Patent.
4, 1911, Serial No. 663,940. Renewed February 18, 1915. Serial No. 9,207.
To all whom it may concern:
Be it known that I, EDWARD ERIGKSON, a citizen of the United States, and a resident of West Lynn in the county of Essex and State of Massachusetts, have invented certain new and and useful Improvements in Presser-Foot Mechanism for Sewing-Machines of which the following is a specification.
This invention relates to machines for sewing heavy material such as leather, and refers particularly to the mechanism for controlling the presser foot of that type known as welt sewing machines.
The object of the invention is to provide an improved mechanism which will effect the lockingof the presser foot to hold the work tightly during the formation of each stitch, and to release it during the feed of the work.
To this end the present invention consists in the construction and combination of parts substantially as hereinafter described and claimed.
Of the accompanying drawings,Figure 1 is front elevation of the machine complete. Fig. 2 is an el vation from the left of Fig. 1. Fig. 3 is an elevation from the right of Fig. 1. Fig. 4 represents a section on line 4-lof Fig. 1, and Fig. represents a detail, partly in section on line 5-5 of Fig. e.
In the present application only the presser foot mechanism will be described but for the description and operation of the entire lockstitch sewing machine reference may be made to my application 644;,769, filed Aug. 18 1911, of which the present application is a division.
The same reference characters indicate the same or similar parts in all of the views.
In the embodiment of the invention illustrated, the base 30 is formed or provided with two uprights or standards 31, 32, having bearings for a lower main or drive shaft 33 and an upper counter shaft 37 and a fixed shaft 38 on the latter of which are mounted certain parts for operating the shuttle 53. The main shaft has a pulley 34: for a power driving belt, and has a crank 35 intermediate its ends, to which crank is connected one end of a pitman 36 for actuating the awl 137 and needle 121 said awl and needle in their movements being adapted to pass through a slot 66 in the work support 67 with which a presscr foot 71 coacts.
The work presser comprises an arm 71 having a foot 72 (Figs. 1, 2, 3 and 1) to bear on the work supported by arm 67, said arm having a hub 73 mounted on a stud 74 supported by standard 32. An arm 75 projecting rearwardly from the hub 7 3 is provided with a toothed segment 76 which meshes with a pinion 77 (Fig. 1-) fast on rock shaft 78.
To effect the locking of the presser foot to hold the work tightly during the formation of each stitch, and to release it during the feed of the work, the following mecha nism is provided 2-Secured to arm 75 is a segment rack 86, meshing with a pinion 87 having a sleeve hub 88 mounted on a crank or wrist pin 89 (see Fig. 5 in connection with 4:) of a stud rock shaft 90 mounted in standard 32 and carrying an arm 91 at its outer end. The arm 91 has a roll 92 engaging a cam groove 93 in a disk 94 secured to shaft 33,' said cam groove being indicated by dotted lines in Fig. 1. On the wrist pin at the outer end of sleeve hub 88, is a collar 95 havinga ratchet-toothed outer end face 96 engaged by a pin 97 projecting from said wrist pin. A spring 98 is coiled around, and has its ends connected to, the collar and hub so as to constitute a yielding connection between said two members and consequently to cause the presser foot to bear yieldingly on the work with a pressure that may be varied adjusting the collar rotatively the desired adjustment being maintained by the pin 97 engaging one of the end teeth of the collar. Such yielding pressure however ceases when the awl is penetrating tie work. To interrupt this yielding pressure and cause the presser foot to remain immovably in position to resist the force of the upwardly moving awl I provide means for preventing rotation of the pinion 87 at the proper time. Mounted on the hub 88 are two collars 99 and/100, said collars inclosing a spring 101 which snugly fits the hub and has its two ends connected to the two collars so that relative rotation of the collars will tighten the spring on the hub to act as a clutch brake on the latter, or release it; The collar 99 has an arm 102 provided with a slot which receives a fixed pin 103, whereby said collar is prevented from rotating although it presents no obstruction to the lateral movement of the pinion hub 88 when the wrist pin is shifted. The other collar 100 has an arm 101 connected by a link 105 with a lever 106 fulcrumed on a stud 107 and having a roll 108 engaging a cam groove 109 in disk 9 1. This arm 101 is moved downwardly by the cam groove 109 when it is desired to tighten the brake spring. Pivoted to the lever 106 at 110 is an arm 111 having a roll 112 engaging the outer surface of the rib which forms the outer wall, of cam groove 109. The other end of the arm.111 is formed or provided with a yoke 113 which embraces an eccentriclla (see dotted lines in Fig. 4) which is mounted on stud107 and has an arm 115 which enters a notch 116 in a vertically movable bar 117 that is adapted to be lifted manually, as by a suitable treadle, not shown. lVhen-the parts are in the position shown in Fig. 1, the two rolls 108, 112, follow the cam rib and cause the lever 106 to be so actuated-that the collar 100 is rotated sufliciently to tighten the brake spring 101 and prevent the presser foot from yielding excepting at the end of the feed movement. The gripping effect of the coiled brake spring 101 is obtained regardless of the thickness of the work. That is, when the presser foot is lifted for the introduction of work and then descends upon the work under the pressure of spring 98, it may occupy a higher or a lower position according to the work. But the grip to hold it there will be just as effective whether the work be thick or thin.
The hub 73 of the presser foot arm or leverris provided with an arm 118 having a pin 119 which projects across the top of bar 117. lVhen the bar 117 is lifted, as when Work is to be introduced, the action on arm, 118 is such as to raise the presser foot 72. Before this, however, the arm 115 is actuated so as to rock the eccentric 114C and swing arm 111 to throw the roll 112 out wardly and then as the cam disk 94; rotates, a recess 120 in the inner wall of cam groove 109 comes to a position opposite roll 108 so as to relieve outward pressure on said roll and thus release the braking effect of spring 101 and permit the presser foot to be lifted by the further upward movement of bar 117. WVhen the bar 117 is lowered again, a projection 117 (Fig. 4:) therefrom engages the studat-the outer end of arm 115 and insures the return of said stud into the notch 116.
Theipresser foot is positively lifted slightly (about. one-sixteenth of an inch) during eachfeed operation. This is when the roll 92. of. =arms.-.91..is in the position indicatedin jEig. -6. As the sleeve hub,,88 is eccentric to the axis of stud 90 which carries arm 91, movement of arm 91 toward said position swings said hub 88 laterally. At this time, the brake spring 101 is holding pinion 87 locked so that the said lateral movement of the pinion 87 acts through the rack 86 to oscillate the arm 75 and raise the foot 72 slightly but positively, so that the work can be fed freely by the awl.
A spring 101 is coiled upon the hub 88 of pinion 87 in such direction that, as it is tightened to apply a braking action, it tightens in such direction as to add its force to that of spring 98, which latter spring causes the presser foot to bear yieldingly upon the work. This additional force applied to the presser foot by the tightening of the spring 101 is due to the increased frictional contact of said spring with the periphery of the hub 88 which tends to rotate said hub in the direction that the spring 101 is being wound, this direction corresponding to the direction that the tension of the spring98 acts. This additional pressure continues to be increased until the arm 10-1 comes to a rest at the end of its downward movement. The momentary addition of the force of spring 101 to that of spring 98 causes the presser foot to hear more heavily upon the work just before the lock ing occurs due to the complete binding of the brake spring 101 upon said hub. This action, however, does not interfere with the lifting of the presser foot to permit the awl to feed when the crankmounted stud 89 is moved by the actuation of the arm 91. The arm 91 is actuated at the proper time to cause the stud 89 to shift about the aXis of the stud shaft to which said arm 91 is connected, to cause the presser foot to be lifted to permit the awl to feed the work. This provision enables the work to be properly fed by the awl, even when the stock is soft. Consequently, the work when being fed does not have to be pulled along by the awl against the resistance of any spring pressure whatever applied to the presser foot.
I claim:
1. Presser foot mechanism'for sewing machines comprising in combination a lever having a presser foot and a segment rack, a pinion meshing with said rack, means for yieldingly actuating the pinion to cause the foot of said lever to bear yieldingly on the work after the completion of the feed, means for holding the lever rigidly during other operations, means for positively lifting the presserfoot during each feed operation, ,a manually operable presser-foot lifter, and connections for releasing the lever holding means when said manually operablelifter is actuated.
Presser foot mechanism for sewing machines comprisingin combination a lever having a presser foot and a segment rack, a pinion meshing with said rack, means for yieldingly actuating the pinion to cause the foot of said lever to bear yieldingly on the work after the completion of the feed, a brake device to hold the lever rigidly at predetermined times, means for positively lifting the presser foot during each feed operation, means for bringing said brake device into operation when the awl is penetrating the work, a manually operable presser-foot lifter, and connections for releasing the brake when said manually operable lifter is actuated.
3. Presser foot mechanism for sewing machines comprising in combination a lever having a presser foot, a toothed segment carried by said lever, a pinion in permanent engagement with said segment and provided with a lateral hub, a spring for yieldingly opposing rotation of said pinion in one direction, a brake spring coiled on the hub of said pinion, and means for intermittently tightening said brake spring, consisting in part of two collars loosely mounted on said hub and to each of which an end of said spring is connected.
4:. Presser foot mechanism for sewing machines comprising in combination a lever having a presser foot, a toothed segment carried by said lever, a stud having a sleeve mounted on it, said sleeve having a pinion in permanent engagement with said segment, a collar adjustably mounted on said stud, a brake spring coiled on the hub of said pinion, and means for intermittently tightening said brake spring.
5. Presser foot mechanism for sewing machines comprising in combination a lever having a presser foot, a toothed segment carried by said lever, a stud shaft having a crank pin, a sleeve mounted on said crank pin and having a pinion engaging said segment, a spring for yieldingly opposing rotation of the sleeve and pinion, an arm con- &
nected to said stud shaft, and means for oscillating said arm and stud shaft.
6. Presser foot mechanism for sewing machines comprising in combination a lever having a presser foot, a toothed segment carried by said lever, a crank-mounted stud having a sleeve mounted on it, said sleeve having a pinion engaging said segment, brake mechanism for positively preventing rotation of the sleeve in either direction at predetermined times, and means for intermittently changing the position of the crank-mounted stud.
7. Presser foot mechanism for sewing machines comprising in combination a lever having a presser foo-t, a toothed segment carried by said lever, a stud having asleeve mounted on it, said sleeve having a pinion engaging said segment, two collars mounted on said sleeve, a spring surrounding the sleeve and having its ends connected to the two collars, and means for actuating one of said collars to tighten the spring on the sleeve and prevent its rotation at predetermined times.
8. Presser foot mechanism for sewing machines comprising in combination a lever having a presser foot, a toothed segment carried by said lever, a crank-mounted stud having a sleeve mounted on it, said sleeve having a pinion engaging said segment,
brake mechanism for positively preventing rotation of the sleeve in either direction at predetermined times, means for intermittently changing the position of the crankmounted stud, and means for manually relfeasing the brake and lifting the presser oot.
In testimony whereof I have afiixed my signature, in presence of two witnesses.
EDWVARD ERICKSON.
Witnesses:
A. W. HARRISON, J. M. MURPHY.
Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G.
US663940A 1911-08-18 1911-12-04 Presser-foot mechanism for sewing-machines. Expired - Lifetime US1151768A (en)

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US663940A US1151768A (en) 1911-08-18 1911-12-04 Presser-foot mechanism for sewing-machines.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US64476911A US1138858A (en) 1911-08-18 1911-08-18 Lock-stitch sewing-machine.
US663940A US1151768A (en) 1911-08-18 1911-12-04 Presser-foot mechanism for sewing-machines.

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