US3757714A - Upper transport device for sewing machines - Google Patents

Upper transport device for sewing machines Download PDF

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Publication number
US3757714A
US3757714A US00259424A US3757714DA US3757714A US 3757714 A US3757714 A US 3757714A US 00259424 A US00259424 A US 00259424A US 3757714D A US3757714D A US 3757714DA US 3757714 A US3757714 A US 3757714A
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US
United States
Prior art keywords
foot
material pressure
upper transport
pressure rod
spring
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
US00259424A
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English (en)
Inventor
K Gustmann
H Wenz
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.)
PFAFF GmbH
Original Assignee
PFAFF GmbH
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 PFAFF GmbH filed Critical PFAFF GmbH
Application granted granted Critical
Publication of US3757714A publication Critical patent/US3757714A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
    • D05B27/04—Work-feeding means with feed dogs having horizontal and vertical movements arranged above the workpieces

Definitions

  • ABSTRACT The means for feeding the material to be sewed by a sewing machine (especially a high speed sewing machine) comprises an upper transport foot and a material pressure footf'According to this invention, separate spring means, independent of one another, are provided to apply pressure to the upper transport foot, and the material pressure foot, so that the mass of the moving parts can be reduced and the undesirable inertia effects can be overcome when stopping the machine.
  • the invention concerns an upper-transport device for a sewing machine with a spring operated stopping of the material pusher foot and the upper transport foot carried on the material pusher rod.
  • the invention seeks to essentially reduce the moving mass of an upper transport arrangement and to attain this object by supporting the material pressure rod from a parallel, adjustably attached stop provided on the sewing machine and by arranging for both the material pressure foot and the upper transporting foot opposite the material pressure rod to move vertically at any given time by an allotted amount independently of each other, and to remain under the influence of a suitable spring.
  • FIG. 1 is a partial front view of a sewing machine with the upper transport device of-the invention.
  • FIG. 2 is an enlarged prospective view, partially in section, of the upper transport device.
  • the material presser rod 3, having a bore 2 is supported in housing 1 in the sewing machine, and to the lower end thereof the bracket 4 isfastened with screws.
  • the bracket 4 is equipped with an arm 5 projecting behind'the rod 3 (with respect to the front of the machine), and has at its forward end two parallel stops 6 and 7, one above the other.
  • the main driving shaft 8 which through adriving element (not shown) drives the needle rod 9 (FIG. 1 containing the needle 10.
  • adriving element not shown
  • the needle rod 9 (FIG. 1 containing the needle 10.
  • the main shaft 8 (FIG. 2) a first eccentric 11 and a secondeccentric l2.
  • the ring follower of eccentric l 1 is connected to the eccentric rod 13 on which is encamped the slide block 15 held in the rocker arm guide 14.
  • the direction of the guideway 14 is determined by the adjustable shaft 16 which is supported in the housing with a hand lever (not shown), projecting from the housing. With the hand lever, the size and direction of the feed movement of the material advancing means 19, projecting through the slit 17 of the stitching plate 18 is determined in the known way.
  • a link20 transmits the horizontal or side movement of rod 13 to a double lever 21 which is supported in the housing, and thence to a link 22 mounted on pivot 23 which is carried by a pair of links 24 on the arm 5 of bracket 4.
  • the eccentric l2 drives the eccentric rod 25 which,
  • the free arm 31 of lever 29 has a smooth upper surface 30, which stretches under the pin 32 rotatably sup porting roller 33.
  • the pin 32 is attached in the yokelike shaft 34 (partly cut away) mounted on arm 35, which is also supported from pivot 23 as part of the upper transporting foot 36.
  • the horizontal wall portion 37 of the yoke-like shaft 34 has a smooth pressure surface 38 adjacent the lower end of bracket 4 on which the ball 39, extending from the lower flared surface 40 of bore 41 in bracket 4, the flaring of surface 40 being adapted to accommodate the ball 39.
  • the bore 41 in bracket 4, is an extension of the boring 2in the material pressure rod3.
  • a spring 42 is provided which contacts adjacent the upper end of the rod 3, an adjusting screw 43 threadedly connected to the rod 3 and which spring contacts at its other end, a bolt 44 which is guided in the borings 2 and 41 and presses against ball 39.
  • the leaf spring 45 which is attached to the housing in a known way, presses with its end against ball 47, held in the cup shaped recess 46 of the adjusting screw 43. By screwing adjusting screw 43 in or out the pressure of leaf spring 45 can be changed.
  • a lifter 48 is attached to the material pressure rod 3 and has a stop surface 49 cooperating with stop 50 of the pivotable hand lever 51 which is attached to the housing 1, as shown.
  • the arm 52 which is rigidly connected to or an integral part of the lifter member 48, cooperates with the I helically rising curved track 53 of the fitting 54.
  • Said fitting 54 is carried at the end of shaft 55 mounted in bearing eye 56 of housing 1, andlsaid shaft 55 carries a rotatable knob 57 at its outer end.
  • the extension 28 of arm 5 comprises two supporting arms 58 extending at right angles to the extension 28 and to the ends of which a yoke-formed spring 59 is attached.
  • This spring carries at its front side an upwardly extending, curved clip or claw 60, the free end 61 of which is inserted between stops :6 and 7.
  • On the front side of spring yoke 59 is attached the shaft 62 of the material presser foot 63 whose base 64 presses the goods to be sewed against the advancing means 19.
  • the base 64 is provided with a slot 65, through which the upper transport foot 36 can bring the sewed goods and the material advancing means 19 into contact.
  • the spring 45 holds the arm 52 of the material presser rod 3 on the curved track of the fitting 54.
  • the support bearing for the material presser rod 3 can be adjusted to the strength (thickness) of the goods .to be sewed.
  • the material presser rod 3 and its attached bracket 4 will be effectively lowered so far, that the base 64 of the material-presser-foot 63 rests on the goods to be sewed under the action of spring 59 when the advancing means 19 is lowered below the stitch plate 18 and so that the end of clip 60 is lifted straight off of stop 6.
  • the material presser foot 63 will no longer be pressed on the goods to be sewed by the pressure of spring 50 when the pressure of leaf spring 45 presses heavily on the fitting 54 and is not transmitted to the material pressure foot 63.
  • the apparatus works as follows:
  • Rotation of the main shaft 8 propels the eccentrics l 1 and 12 together with the sewing mechanism of the machine.
  • the eccentric ll displaces the rod 13 with its slide block 15 in the guide 14. According to the position of the guide 14, which can be adjustably changed through shaft 16, the double lever 21 is more or less vigorously oscillated and a corresponding degree of feeding movement is transmitted to the upper transport foot 36 through link 22.
  • upper transport foot 36 is made'possible through contact between roller 33 and the surface 30, as well as between surface 38 and ball 39, and between bolt 44 and the roller bearing.
  • the stop surface 40 limits the movement of ball 39 and the relative position of the upper surface 38 of the wall portion 37.
  • the eccentric 12 oscillates the bell crank lever 26 through rod 25 and thus oscillates the lever 29 through link 27.
  • the arm 31 of lever 29 is lifted and lowered.
  • the upper surface 30 thereof pushes the upper transport foot 36 upward by means of the roller 33.
  • the lifting is carried out agains the action of spring 42, the loading pressure of which is applied to ball 39.
  • the sewed goods accordingly is loaded only by the pressure of spring 59 acting on material pressure foot 63.
  • the lower material advancing means 19 has then dropped below the upper surface of stitch plate 18.
  • the roller 33 By lowering of arm 31, the roller 33 is released from upper surface 30 whereupon the upper transport foot 36 touches down on the goods being sewed through the action of spring 42. Simultaneously, the teeth of the material advancing means 19 move through the open slit 17 of stitch plate 18 above the surface of the stitch plate to lift the material pressure foot 63. Since the distance between the two stops 6 and 7 is greater than the height of the lift of the material advancing means 19 above the surface of stitch plate 18, the spring 59 takes up all of the lifting movement of the material pressure foot 63. The material pressure rod 3 remains in its lower position.
  • The'upper transport system of the invention has, accordingly, a stroke limit for the lower material advancing means 19 operating independently from the springiness of the upper transport foot 36 and the material presser foot 63.
  • the hand lever 51 For the lifting of the material pressure foot 63, the hand lever 51 is rotated. Thereby the stop 50 of the lift member 48 and the material pressure rod 3 is lifted. Simultaneously, the stop 6 moves upwardly and takes along the clip 60 so that the material presser foot 63 is lifted from the sewing goods. As a result of the pivoting, the upper transport foot 36 will, as well, be correspondingly lifted through the link pair 24 and also through the pivoting of lever 29 on carrier 4.
  • An upper transport arrangement for a sewing machine having a main drive shaft, a casing, a material pressure foot and an upper transport foot and drive mechanisms to operate said pressure foot and said upper transport foot from the main drive shaft compriss.
  • a stop means adjustably mounted in the casing of the machine for supporting the material pressure rod with respect to said first spring
  • said means including a third spring means associated with said pressure rod, independent of the second spring means and normally urging the upper transport foot against the goods to be sewed,
  • control means to adjust for the thickness of the material to be sewed comprising a rotatable shaft parallel to the material pressure rod carrying a curved spiral cam surface, and collar means attached to said material pressure and having an arm adapted to ride on said cam surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US00259424A 1971-06-19 1972-06-05 Upper transport device for sewing machines Expired - Lifetime US3757714A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7123663 1971-06-19

Publications (1)

Publication Number Publication Date
US3757714A true US3757714A (en) 1973-09-11

Family

ID=6622030

Family Applications (1)

Application Number Title Priority Date Filing Date
US00259424A Expired - Lifetime US3757714A (en) 1971-06-19 1972-06-05 Upper transport device for sewing machines

Country Status (3)

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US (1) US3757714A (en(2012))
JP (1) JPS545139Y2 (en(2012))
GB (1) GB1370571A (en(2012))

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3863580A (en) * 1972-04-13 1975-02-04 Rimoldi C Spa Virginio Low-inertia presserfoot for sewing machines
US3927629A (en) * 1973-10-20 1975-12-23 Pfaff Ind Masch Sewing machine presser foot and feed dog lifting mechanism
US3952675A (en) * 1975-03-26 1976-04-27 Thompson Elmer R Sewing machine feed conversion apparatus
US4476796A (en) * 1981-05-18 1984-10-16 Pfaff Industriemaschinen Gmbh Upper cloth feed in a sewing machine
US4487145A (en) * 1981-08-13 1984-12-11 Pfaff Industriemaschinen Gmbh Presser foot drive linkage in a sewing machine
US4611548A (en) * 1984-09-28 1986-09-16 Dorina Nahmaschinen Gmbh Top transport for sewing machines
US7055445B1 (en) * 2005-01-12 2006-06-06 Fritz Gegauf Aktiengesellschaft Bernina-Nahmaschinenfabrik Top transport device for sewing machines
CN117512889A (zh) * 2024-01-05 2024-02-06 泰州增荣特种装备科技有限公司 一种背囊布加工用的高速平车

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH684415A5 (fr) * 1990-11-29 1994-09-15 Mefina Sa Machine à coudre.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1325037A (en) * 1919-12-16 L underdone
US3570427A (en) * 1969-07-02 1971-03-16 Pfaff Ag G M Top feed means for sewing machines
US3570426A (en) * 1969-11-25 1971-03-16 Singer Co Top feed mechanism for sewing machines
US3614934A (en) * 1968-08-21 1971-10-26 Pfaff Ag G M Sewing machine with upper feed

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1325037A (en) * 1919-12-16 L underdone
US3614934A (en) * 1968-08-21 1971-10-26 Pfaff Ag G M Sewing machine with upper feed
US3570427A (en) * 1969-07-02 1971-03-16 Pfaff Ag G M Top feed means for sewing machines
US3570426A (en) * 1969-11-25 1971-03-16 Singer Co Top feed mechanism for sewing machines

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3863580A (en) * 1972-04-13 1975-02-04 Rimoldi C Spa Virginio Low-inertia presserfoot for sewing machines
US3927629A (en) * 1973-10-20 1975-12-23 Pfaff Ind Masch Sewing machine presser foot and feed dog lifting mechanism
US3952675A (en) * 1975-03-26 1976-04-27 Thompson Elmer R Sewing machine feed conversion apparatus
US4476796A (en) * 1981-05-18 1984-10-16 Pfaff Industriemaschinen Gmbh Upper cloth feed in a sewing machine
US4487145A (en) * 1981-08-13 1984-12-11 Pfaff Industriemaschinen Gmbh Presser foot drive linkage in a sewing machine
US4611548A (en) * 1984-09-28 1986-09-16 Dorina Nahmaschinen Gmbh Top transport for sewing machines
US7055445B1 (en) * 2005-01-12 2006-06-06 Fritz Gegauf Aktiengesellschaft Bernina-Nahmaschinenfabrik Top transport device for sewing machines
CN117512889A (zh) * 2024-01-05 2024-02-06 泰州增荣特种装备科技有限公司 一种背囊布加工用的高速平车
CN117512889B (zh) * 2024-01-05 2024-04-26 泰州增荣特种装备科技有限公司 一种背囊布加工用的高速平车

Also Published As

Publication number Publication date
JPS4810656U (en(2012)) 1973-02-06
GB1370571A (en) 1974-10-16
JPS545139Y2 (en(2012)) 1979-03-06

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