US3356052A - Pattern sewing device for sewing machines - Google Patents

Pattern sewing device for sewing machines Download PDF

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Publication number
US3356052A
US3356052A US439869A US43986965A US3356052A US 3356052 A US3356052 A US 3356052A US 439869 A US439869 A US 439869A US 43986965 A US43986965 A US 43986965A US 3356052 A US3356052 A US 3356052A
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United States
Prior art keywords
cam
cams
sewing
needle bar
pattern
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Expired - Lifetime
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US439869A
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English (en)
Inventor
Bono Luigi
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Necchi SpA
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Necchi SpA
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Publication date
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines

Definitions

  • the present invention relates to sewing machines in which the needle bar is made to oscillate transversely of the direction in which the fabric moves in order to sew a pattern, usually an ornamental pattern, rather than along a straight line.
  • the needle bar supporting frame is movably supported from the machine housing and is made to oscillate by means of a reciprocating rod whose reciprocal movements conform to the profile of either one of different pattern cams which form part of an ornamental pattern sewing device.
  • the oscillatory pattern defined by the needle bar frame can be changed by simply changing from one cam to another. This changing heretofore has required two separate maneuvers on the part of the machine operator: first, the operator had to shift the cam then in use out of its driving relationship with the reciprocating rod; and second, the operator had to shift another cam into said driving relationship.
  • An object of the present invention is to provide an ornamental pattern sewing device which comprises a stack of pattern cams and wherein the changing of cams is realized through a single maneuver by the machine operator.
  • a further object is to provide such a device wherein the disengagement of one cam automatically causes the engagement of another in driving relationship relative to the needle bar frame.
  • a further object is to provide in the aforementioned device, a cam changing means, which is simple, trouble-free, efficient, and inexpensive to produce.
  • FIGURE 1 is a partially cut-away front elevation view of a sewing machine which incorporates the device of this invention
  • FIGURE 2 is a back elevation view (relative to FIG- URE 1) of only the ornamental pattern sewing device of this invention
  • FIGURE 3 is a left-side elevation view (relative to FIGURE 2);
  • FIGURE 4 is a section view taken along line IV-IV of FIGURE 2;
  • FIGURE 5 is an enlarged partial sectional view of the stack of pattern cams in accordance with a first embodiment of this invention
  • FIGURE 6 shows a portion of FIGURE 5 on an enlarged scale
  • FIGURE 7 is an enlarged partial sectional view, corresponding to FIGURE 5, in accordance with a second embodiment of this invention.
  • FIGURE 1 shows the overall relationship of a pattern sewing device to the needle bar in a sewing machine.
  • the machine comprises a hollow housing H which supports rotatable main shaft 1 which in turn is driven 'by being connected to a conventional driving means (not shown).
  • Main shaft 1 is connected through appropriate connection means 2 to a needle bar 3 which is mounted for reciprocating movement in needle bar support 4.
  • Rotary motion of shaft 1 is transmitted into reciprocating motion of bar 3 through connection means 2.
  • the longitudinal line of sewing that is, the direction in which the fabric moves, is along a line which is perpendicular to the plane of FIGURE 1. If the needle bar 3 were to reciprocate in a single plane the sewing line would be essentially a straight line.
  • the needle bar 3 can oscillate in a horizontal direction, i.e., from right to left or generally parallel to the axis of main shaft 1 so that the sewing line which results from this oscillatory movement will correspondingly define a back and forth continuous line rather than a straight line.
  • support 4 is not rigidly mounted to housing H but is instead resiliently mounted thereto by means of flat leaf spring 5.
  • the opposite ends of spring 5 are secured to housing H and to support 4 by means of screws 6 and 7, and there is a space between housing H and the top of support 4 so as to permit freedom of movement of support 4.
  • a pattern sewing device generally designated by 8.
  • the device is drivingly associated with transversely reciprocable rod 10, one end of which abuts against one side of support 4.
  • Device 8 reciprocates rod 10 in accordance with a certain pattern of oscillatory movement, and rod 10 in turn imparts this oscillatory movement to support 4.
  • leaf spring 5 The normal, relaxed disposition of leaf spring 5 is such that with rod 10 at its extreme right hand position, the frame 4 will abut the left end of rod 10. In other words, spring 5 of itself returns the support 4 and bar 3 to the extreme right position while rod 10 serves to push support 4 to its extreme left position.
  • the pattern sewing device 8 comprises a plurality of working elements supportingly mounted on a vertical base plate 11 which in turn is secured to housing H by means of machine screws 9.
  • bearing supports 12 which rotatably support cam shaft 13.
  • Shaft 13 is drivingly connected to the machine main shaft 1 by means of the helical gear 14 and the worm 15, each respectively keyed onto the shafts 13 and 1.
  • An axially movable cam housing member 16 is mounted about cam shaft 13 for axial movement relative thereto, for example, in the direction of arrow Y (FIGURE 3) or oppositely thereto.
  • a vertical rack gear 20 which meshes with a gear Wheel 21 which in turn is rigidly keyed to hub 22.
  • a hand control knob or wheel 23 is also rigidly connected to hub 22, with elements 21, 22 and 23 all being rigidly rotatable together about pivot pin 24 which is supported on base plate 11. It is, therefore, seen that rotation of the hand wheel 23 will rotate wheel 21 and in turn will vertically move the housing 16.
  • a stack comprising a plurality of separate cams is generally designated by 17. These cams are mounted on cam shaft 13 so as to be rotatable therewith but axially slidable therealong by means of a key 19 and keyway 18 arrangement.
  • the keyway 18 extends along the shaft 3 while the key 19 is rigidly a part of the cams.
  • the cams are rotatable with shaft 13 within and relative to the housing member 16; however, the cams are axially fixed relative to the member 16 so that the housing 16 moves the cams axially along shaft 13 as the housing is moved through manipulation of hand wheel 23.
  • the cams are stacked within housing 16 as is shown in FIGURES 5 and 6.
  • Numerals 36, 37 and 38 designate three separate cams each having a distinct outer circumferential cam profile 39, 40, 41, respectively, each profile corresponding to a different sewing pattern.
  • the cams are drivingly associated with the rod by means of a lever 34 which is pivotably mounted at 35 on the base plate 11.
  • the top end of lever 34 is connected to one end of rod 10 by any suitable means, while the bottom end of lever 34 is abuttingly engaged by one end 33 of cam follower lever 30.
  • the other end 32 of cam follower lever 30 rides against a respective cam profile.
  • the follower lever 30 is pivotably mounted at 31 to base plate 11 so that as the cam rotates, its profile causes follower lever 30 to oscillate about pivot 31 in conformity to the ups and downs in the cam profile, and this oscillatory movement of lever 30 is transmitted to lever 34 which in turn transmits it to rod 10.
  • a second leaf spring 28 is mounted at one end thereof to the base plate 11 by means of screw 29, while a free end portion 27 of said spring is convexly shaped to correspond to the contour of the notches 26 and to slide from one notch to another, said free end portion being biased into said notches.
  • Each notch 26 corresponds to a different cam being engaged by follower lever 30, so that with the spring end 27 engaging any one notch 26, the housing 16 and cam 17 assembly is locked in proper operating position for a particular cam.
  • Another cam can be substituted by simply turning hand wheel 23 until the spring end 27 slides into another of the notches.
  • a suitable indicator means can be provided on the outside of housing H and on hand wheel 23 to indicate the positions of the hand wheel which correspond to the respective cams being in driving position.
  • An important feature of the present invention resides in the particular shape of the follower end 32 of the follower lever 30. This shape permits a shifting from one cam of smaller diameter to a cam of larger diameter without necessitating a prior lateral shifting of the follower lever to a position out of the way of the larger cam.
  • the follower end portion 32 of lever 30 includes upper and lower inclined surfaces or bevelled edges 46 and 45, respectively.
  • An important consideration is that the radial length A of these surfaces slightly exceeds the radial difference in height B between the lowest radial surface 49 of the smaller cam 37 and the highest radial surface 48 of the larger cam 33, so that when the cams are shifted upwardly (arrow Y in FIGURE 5) the corner 47 of larger cam 38 will abut the inclined surface 45 and will thereby gradually and smoothly push lever 30 radially outward (to the left in FIGURES 5 and 6) as the cam 38 moves upwardly to assume the position which cam 37 presently is shown to occupy in FIGURE 6. It is to be understood that for practical reasons dimension A should slightly exceed dimension B; however, theoretically, dimension A should be at least equal to dimension B.
  • the axial spacing between cams, as provided by spacers 43 and 44, is slightly greater than the axial width W of the bevelled edges 45, 46. This is necessary in order to prevent any part of edges 45, 46 from contacting the corners 47 or 50 on the adjacent cams while the cams are in the position shown in FIG- URES 5 and 6.
  • the surfaces 45 and 46 are bevelled in the plane which includes the rotational axis of the cams 36, 37, and 38.
  • the surfaces 45 and 46 are bevelled in an axial direction, that is a direction parallel to the direction in which occurs the axial shifting of the cams.
  • FIGURE 7 shows a second preferred embodiment of the inventive concept of this application.
  • the follower lever end portion instead of the follower lever end portion having inclined surfaces, it has horizontal or straight surfaces and the cams themselves are provided with bevelled edges.
  • the respective cams are designated 51, 52 and 53.
  • Cam 52 is shown to be the smallest of the cams and is located between larger cams 51 and 53 which each include bevelled edges 54 and 55.
  • the axial height of edges 54, 55 should exceed or be at least equal to the maximum height difference (which is analogous to dimension B in FIG- URE 6) between adjacent cams.
  • the three cams are axially juxtaposed, that is, axially contacting each other and that the axial width of the end of lever 30 which rides against the profiled cam surfaces must be narrower than the axial width of any cam in order to avoid possibility that the end of lever 30 rides over two adjacent cam profiles at a time.
  • a sewing machine for sewing an ornamental pattern and the like comprising: a needle bar means including an axially reciprocable needle bar, said needle bar means being transversely displaceable relative to a straight sewing line to cause said needle to sew on opposite sides of a straight sewing line, a pattern sewing device for transversely displacing said needle bar means, said device comprising a plurality of separate cams, said cams being coaxially mounted adjacent to each other on a rotatable cam shaft and each one having an outer circumferential profiled surface, each said surface comprising portions of varying radial dimension relative to said surface on an adjacent cam, said cams being rotatably fixed on said cam shaft but being axially displaceable along said cam shaft to alternately place each of said cams in a driving position, a shift means to axially displace said cams along said cam shaft, a cam follower lever pivotally mounted and including a cam follower portion having a sliding surface, said cam follower portion being resiliently biased with said sliding surface bearing against the outer profiled surface
  • said radially acting means comprising a bevelled edge adjacent to said sliding surface on said cam follower portion, said edge being bevelled in an axial direction of said cams and having a radial dimension at least equal to the maximum radial height difference between the profiled surfaces of any two adjacent cams.
  • said radially acting means comprising a bevelled edge adjacent to said profiled cam surfaces on those of said cams having a larger radial extent than next adjacent ones of said cams, said bevelled edge having a radial extent at least equal to the maximum radial height difference between the profiled surface of the cam having the bevelled edge and the profiled surface of the next adjacent cam.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US439869A 1964-03-20 1965-03-15 Pattern sewing device for sewing machines Expired - Lifetime US3356052A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT589364 1964-03-20

Publications (1)

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US3356052A true US3356052A (en) 1967-12-05

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US (1) US3356052A (en)van)
CH (1) CH408615A (en)van)
DE (1) DE1485256C3 (en)van)
GB (1) GB1089254A (en)van)
IT (1) IT717653A (en)van)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792673A (en) * 1971-02-06 1974-02-19 Necchi Spa Sewing machine having automatic pattern sewing device
EP0236927A3 (en) * 1986-03-12 1988-02-24 Necchi Societa Per Azioni Automatic device for detaching the cam followers in a sewing machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000333A (en) * 1954-08-06 1961-09-19 F.Lii Borletti S.P.A. Zig-zag sewing machine with variable sewing cycle
US3034462A (en) * 1959-11-04 1962-05-15 Koyo Seiko Company Ltd Ornamental stitch sewing machine
US3177835A (en) * 1961-09-08 1965-04-13 Koyo Seiko Company Ltd Automatic pattern zigzag sewing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000333A (en) * 1954-08-06 1961-09-19 F.Lii Borletti S.P.A. Zig-zag sewing machine with variable sewing cycle
US3034462A (en) * 1959-11-04 1962-05-15 Koyo Seiko Company Ltd Ornamental stitch sewing machine
US3177835A (en) * 1961-09-08 1965-04-13 Koyo Seiko Company Ltd Automatic pattern zigzag sewing machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792673A (en) * 1971-02-06 1974-02-19 Necchi Spa Sewing machine having automatic pattern sewing device
EP0236927A3 (en) * 1986-03-12 1988-02-24 Necchi Societa Per Azioni Automatic device for detaching the cam followers in a sewing machine
US4765268A (en) * 1986-03-12 1988-08-23 Necchi Societa Per Azioni Automatic device for detaching the cam followers in a sewing machine

Also Published As

Publication number Publication date
GB1089254A (en) 1967-11-01
CH408615A (it) 1966-02-28
IT717653A (en)van)
DE1485256C3 (de) 1975-03-20
DE1485256A1 (de) 1969-06-04
DE1485256B2 (de) 1974-08-01

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