US2887968A - Stitch adjusting mechanism - Google Patents

Stitch adjusting mechanism Download PDF

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Publication number
US2887968A
US2887968A US687730A US68773057A US2887968A US 2887968 A US2887968 A US 2887968A US 687730 A US687730 A US 687730A US 68773057 A US68773057 A US 68773057A US 2887968 A US2887968 A US 2887968A
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United States
Prior art keywords
stitch
lever
shaft
setting
slide
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
US687730A
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English (en)
Inventor
Benink Christiaan Jose Marinus
Wenz Herbert
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GM Pfaff AG
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GM Pfaff AG
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Filing date
Publication date
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Publication of US2887968A publication Critical patent/US2887968A/en
Anticipated expiration legal-status Critical
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines

Definitions

  • a slide lever havingv a guiding slide portion and a free motion portion which is movable together with the abutment lever and a .connecting bar having a pin guided in said slide for transmitting the guiding impulses for the stitch length from the guide cam disk are provided, which levers can be coupled with one another by rotating a disk arranged coaxially with the stitch setting shaft and having an elongated aperture beyond thezero position of the stitch setting device for the automatic control of the forward and reverse stitch.
  • Fig. 1 shows a front view of a sewing machine incorporating the invention
  • Fig. 2 is a section taken along line IIII in Fig. 1 drawn to an enlarged scale;
  • I Fig. 3 is a partial sectional view taken along line III-'- III in Fig. 2 showing the position of the disk for forward stitching;
  • Fig. 4 is a top view partly in section taken along line IV-IV of Fig. 3;
  • Fig. 5 is a sectional view along line VV'in Fig. 4 showing the disk in zero position; and t Fig. 6 is a section taken along line VIVI in Fig. 4 in which the disk is in position for automatically guiding the stitch setting mechanism.
  • the arm shaft 5 is journalled in the arm 3.
  • a balance wheel 6 is supported hollow shifting sleeve 31.
  • Patented May 26, 1959 2 feed dog advancing shaft 14 journalled in a boss 13 projecting from the base plate.
  • a sliding member 16 is secured to the cam follower bar 11 by means of a screw 15 and is received in the stitch setting slide 17 which is pivotally journalled by means of shaft screw 18 and sleeve 19 in the standard 2 (Fig. 3) which is provided for this purpose with a recess 20.
  • Anarm 21 is provided on the slide 17 to which a draw bar 23 is pivotally connected by means of a collar screw 22.
  • the feed dog raising shaft 25 is journalled in a lug 24 in the base plate 1 which is connected in the usual manner to the dog raising cam (not shown) on the arm shaft 5 by way of a crank 26 and cam follower bar 27.
  • a boss 28 on the front side of the standard 2 is provided with a bore in which a bearing sleeve 30 is mounted to receive hollow shifting shaft 31 to theoutwardly projecting end of which the operating knob 32 is secured, while a sleeve 34 with the guide disk 35 is secured by means of a screw 33 tothe inwardly extending end of shaft 31.
  • Disk 35' is provided with an aperture 36 (Fig. 3) presenting curves 37 and 38 for determining the inner and outer limits, respectively, relative to the axis of rotation.
  • An oflset supporting arm 39 is fixedly secured by means of screws 40 to the bearing sleeve 30 (Fig. 4).
  • This arm 39 extends through the aperture 41 in the housing into the standard 2.
  • a stud 42 is provided on the free end of arm 39 on which the abutment lever 44- is journalled by means of a hub 43 and held in place by a lock ring 45.
  • Lever 44 presents the abutment pin 46 (Fig. 3) which projects into the disk 35.
  • the free end of the lever 44 is set off at an angle and is joined to the draw bar 23 by means of collar screw 47 (Figs. 2 and 4).
  • v v The stitch setting slide 17 (Fig.
  • a pin' 54 is secured to the angular end of the lever 44 (Figs. 4 and 5) which extends into the plane of the arm 55 of adjusting member 56 which is fastened to the clamping sleeve 57 which is securely fastened by means of set screw 58 to the stitch setting shaft 59 journalled in the The free end of shaft 59 is provided with a manipulating grip or lever 60.
  • v Adjusting member 56 is biased by a spring 61 (Figs. 4 and'5') which is hooked at one end into a bore 62 of a second lever arm 63 and at the other end around a groove i 64 in the stud 42. This turns member 56 counterclockwise as seen in Fig. 5 until the third lever arm 65 of the adjusting member 56 abuts the reduced end 66 of the stud 42.
  • disk 35 is widened in a manner to permit clearance for movement of the abutment pin 46 on lever 44 towards the other side, so that pin 46 does not touch the two limit lines of the aperture portion 36'.
  • the disk 35 is reinforced by means of a thin disk 67 secured thereto. Disks 35 and 67 carry a pin 68 which is enabled during rotation of the disks 67 or 35 in counterclockwise direction to enter a throat in connecting bar 69 (Figs. 3
  • the inner limit of the aperture 75 is defined by an arcuate edge, the center point of which is at the axis of rotation of lever 74.
  • Fig. 3 illustrates the disengaged position of connecting bar 69 where the pin 72 rests against the arcuate border line of the aperture 75 under the pressure of the spring 76 which is disposed around the pivot axis 71.
  • the connecting bar 69 (Figs. 2, 3 and 4) is journalled at its upper end on pivot axle 71 which is secured in the lever arms of a U-shaped angular lever 77 which is journalled on a pivot axle 78 which, in turn, is secured to a bearing support 80 mounted by means of screws on the supporting plate of the machine.
  • One arm 81 of the angular lever 77 is connected to one end of a guide link 82 which is twisted by a 90 angle, the other end of which is secured to the bent up arm 83 of a rocking lever 84.
  • This rocking lever 84 is pivotally mounted by means of a collar screw 85 and presents a further arm 86 which is also angularly bent and presents a follower 87 which is in engagement with the guide cam disk 88 for controlling the forward and reverse stitching of the machine and which is provided in a known manner in the nest of cams 89 for the lateral deflecting of the needle bar, which cams are driven by the arm shaft 5,
  • the setting of the desired stitch length is effected in a manner known per se by rotating the control knob 32 from zero position of Fig. clockwise, which causes the abutr ment 46 to slide along the outer limit curved edge 37 because the abutment lever 44 is biased upwardly by spring 50 by way of draw bar 23 and the stitch setting slide 17.
  • the manual lever 60 For setting up the corresponding reverse stitch of equal length the manual lever 60 is rotated clockwise counter the force of spring 61 as viewed in Fig. 3, until arm 55 of the adjusting member 56 presses lever 44 downwardly, to a sufiicient extent to cause abutment 46 to contact the reverse stitch guide edge 38. As the lever 60 is released the adjusting member 56 returns to its initial position under the tension of spring 61 which brings the abutment 46 again in engagement with the forward stitch guide edge 37.
  • Stitch adjusting mechanism for a sewing machine having an arm shaft, a stitch setting cam and a dog raising cam on said arm shaft, a feed dog advancing shaft, a setting cam follower bar connecting said advancing shaft to said setting cam, a feed dog raising shaft, a raising cam follower bar connecting said dog raising shaft to said dog raising cam, a stitch guiding cam operatively geared to said arm shaft and a guiding cam follower pivotally mounted adjacent said guiding cam in operative engagement therewith, a guided slide member pivotally connected to said setting cam follower bar and a stitch setting slide pivotally mounted in the machine housing in engagement with said slide member; said mechanism including an abutment lever pivotally mounted at one end on a support in the machine housing and connected at the other end to a draw bar linked to said stitch setting slide and presenting an abutment pin, a guide lever pivotally mounted for movement with said abutment lever having a guiding portion and a free motion portion, a stitch setting shaft rotatably mounted in the standard of the machine presenting an external operating
  • Stitch adjusting mechanism for a sewing machine having an arm shaft, a stitch setting cam and a dog raising cam on said arm shaft, :1 feed dog advancing shaft, a setting cam follower bar connecting said advancing shaft to said setting cam, a feed dog raising shaft, a raising cam follower bar connecting said dog raising shaft to said dog raising cam, a stitch guiding cam operatively geared to said arm shaft and a guiding cam follower pivotally mounted adjacent said guiding cam in operative engagement therewith, a guided slide member pivotally connected to said setting cam follower bar and a stitch setting slide pivotally mounted in the machine housing in engagement with said slide member; said mechanism including an abutment lever pivotally mounted at one end on a support in the machine housing and connected at the other end to a draw bar linked to said stitch setting slide and presenting an abutment pin, a guide lever pivotally mounted for movement with said abutment lever having a guiding portion and a free motion portion, a stitch setting shaft rotatably mounted in the standard of the machine presenting an external
  • said guide disk presenting a pin adapted upon rotation of cam 88 proportionately for the control of the stitch length" of .the forward and reverse stitches.
  • Stitch adjusting mechanism for a sewing machine having an arm shaft, a stitch setting cam and a dog 'raising cam on said arm shaft, a feed dog advancing shaft, a setting cam follower bar connecting said advancing shaft to said setting cam, a feed dog raising shaft, a raising cam follower bar connecting said dog raising shaft to said dog raising cam, a stitch guiding cam operatively geared to said arm shaft and a guiding cam follower pivotally mounted adjacent said guiding cam in operative engagement therewith, a guiding slide member pivotally connected to said setting cam follower bar and a stitch setting slide pivotally mounted in the machine housing in engagement with said slide member; said mechanism including an abutment lever pivotally mounted at one end on a support in the machine housing and connected at the other end to a draw bar linked to said stitch setting slide and presenting an abutment pin, a guide lever pivotally mounted for movement with said abutment lever having a guiding portion and a free motion portion, a stitch setting shaft rotatably mounted in the standard of the machine presenting
  • Stitch adjusting mechanism for a sewing machine having an arm shaft, a stitch setting cam and a dog raising cam on said arm shaft, a feed dog advancing shaft, a setting cam follower bar connecting said advancing shaft to said setting cam, a feed dog raising shaft, a raising cam follower bar connecting said dog raising shaft to said dog raising cam, a stitch guiding cam operativcly geared to said arm shaft and a guiding cam follower pivotally mounted adjacent said guiding cam in operative engagement therewith, a guided slide member pivotally connected to said setting cam follower bar and a stitch setting slide pivotally mounted in the machine housing in engagement with said slide member; said mechanism including an abutment lever pivotally mounted at one end on a support in the machine housing and connected at the other end to a draw bar linked to said stitch setting slide and presenting an abutment pin, a guide lever pivotally mounted for movement with said abutment lever having a guiding portion and a free motion portion, a stitch setting shaft rotatably mounted in the standard of the machine presenting an external

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US687730A 1956-10-09 1957-10-02 Stitch adjusting mechanism Expired - Lifetime US2887968A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP17151A DE1031618B (de) 1956-10-09 1956-10-09 Stichstelleinrichtung fuer Naehmaschinen
CH343216T 1957-09-10

Publications (1)

Publication Number Publication Date
US2887968A true US2887968A (en) 1959-05-26

Family

ID=25736917

Family Applications (1)

Application Number Title Priority Date Filing Date
US687730A Expired - Lifetime US2887968A (en) 1956-10-09 1957-10-02 Stitch adjusting mechanism

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US (1) US2887968A (de)
CH (1) CH347065A (de)
DE (1) DE1031618B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2982241A (en) * 1958-10-21 1961-05-02 Sanwa Mishin Seizo Kabushiki K Feed regulating mechanism for sewing machine
US3022756A (en) * 1959-01-30 1962-02-27 Mefina Sa Mechanism for adjusting the length of stitch on a sewing machine
US3088427A (en) * 1959-04-07 1963-05-07 Filotecnica Salmoiraghi Spa Stitch regulating device
US3096737A (en) * 1960-05-14 1963-07-09 Necchi Spa Fabric feeder mechanism for sewing machine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190727985A (en) * 1907-12-19 1908-12-10 John Arthur Brown Improvements in or relating to Sewing Machines.
US1611372A (en) * 1924-03-15 1926-12-21 Nolde & Horst Co Control attachment for embroidery-sewing machines
US2685266A (en) * 1951-12-14 1954-08-03 Vittorio Necchi S P A Stitch control lever limiting device
US2704986A (en) * 1951-11-30 1955-03-29 Vittorio Necchi S P A Knob adjusting means for adjustable sewing machine feed
US2751868A (en) * 1952-06-20 1956-06-26 Schwab Max Sewing machine
GB756403A (en) * 1953-09-01 1956-09-05 Husqvarna Vapenfabriks Ab Improvements in or relating to sewing machines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190727985A (en) * 1907-12-19 1908-12-10 John Arthur Brown Improvements in or relating to Sewing Machines.
US1611372A (en) * 1924-03-15 1926-12-21 Nolde & Horst Co Control attachment for embroidery-sewing machines
US2704986A (en) * 1951-11-30 1955-03-29 Vittorio Necchi S P A Knob adjusting means for adjustable sewing machine feed
US2685266A (en) * 1951-12-14 1954-08-03 Vittorio Necchi S P A Stitch control lever limiting device
US2751868A (en) * 1952-06-20 1956-06-26 Schwab Max Sewing machine
GB756403A (en) * 1953-09-01 1956-09-05 Husqvarna Vapenfabriks Ab Improvements in or relating to sewing machines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2982241A (en) * 1958-10-21 1961-05-02 Sanwa Mishin Seizo Kabushiki K Feed regulating mechanism for sewing machine
US3022756A (en) * 1959-01-30 1962-02-27 Mefina Sa Mechanism for adjusting the length of stitch on a sewing machine
US3088427A (en) * 1959-04-07 1963-05-07 Filotecnica Salmoiraghi Spa Stitch regulating device
US3096737A (en) * 1960-05-14 1963-07-09 Necchi Spa Fabric feeder mechanism for sewing machine

Also Published As

Publication number Publication date
CH347065A (de) 1960-06-15
DE1031618B (de) 1958-06-04

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