US3074364A - Zigzag mechanism for sewing machines - Google Patents

Zigzag mechanism for sewing machines Download PDF

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US3074364A
US3074364A US4335A US433560A US3074364A US 3074364 A US3074364 A US 3074364A US 4335 A US4335 A US 4335A US 433560 A US433560 A US 433560A US 3074364 A US3074364 A US 3074364A
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oscillating
pitman
bracket
needle bar
plate
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US4335A
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Ralph E Johnson
Kohimayer Edward
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Singer Co
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Singer Co
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Priority to CH1035260A priority patent/CH388745A/en
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    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B19/00Programme-controlled sewing machines
    • D05B19/02Sewing machines having electronic memory or microprocessor control unit
    • DTEXTILES; PAPER
    • D05SEWING; EMBROIDERING; TUFTING
    • D05BSEWING
    • D05B3/00Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing

Description

Jan. 22, 1963 R. E. JOHNSON ETAL ZIGZAG MECHANISM FOR SEWING MACHINES Filed Jan. 25, 1960 5 Sheets-Sheet l INVENTORS. Ralph E. Johnson and Edward Koh/mayer ATTORNEY BY WITNESS Jan. 22, 1963 R. E. JOHNSON ETAL 3,074,364
ZIGZAG MECHANISM FOR SEWING MACHINES 5 Sheets-Sheet 2 Filed Jan. 25, 1960 m7 y M W mmm R NS. m EHO VhK w mw 5w 0/ h d WE WITNESS Jan. 22, 1963 R. E. JOHNSON ET AL 3,074,364
ZIGZAG MECHANISM FOR SEWING MACHINES Filed Jan. 25, 1960 5 Sheets-Sheet 3 INVENTORS. 30 f Ralph E Johnson and y Edward Koh/mayer WITNESS WHWESS Jan, 22, 1963 R. E. JOHNSON ETAL 3,074,364
ZIGZAG MECHANISM FOR SEWING MACHINES Filed Jan. 25, 1960 5 Sheets-Sheet 4 lllllllllllllllllllllllllllllllllllllllllflllll INVENTORS. Ralph E Johnson and y Edward Koh/mayer M $56M 7 v. aw
/ ATTORNEY Jan. 22, 1963 R. E. JOHNSON EIAL 3,074,364
ZIGZAG MECHANISM FOR SEWING MACHINES 5 Sheets-Sheet 5 Filed Jan. 25, 1960 mm WWW mmvm M m h lww R ATTORNEY United States Patent 33374564 ZEGZAG MECHANISM iFflR SEWKNG MAQHINES Ralph E. Johnson, Mountainside, and Edward Kohhnayer, Linden, NJ, assignors to The Singer Manufacturing Company, Elizabeth, N.J., a corporation of New Jersey Filed Jan. 25, 19nd, Ser. No. 4,335 4 Claims. (*Ci. 112-458) The present invention relates to zigzag or ornamental stitch sewing machines and has for a primary object to provide a new and improved cam-type actuating mechanism for imparting lateral vibration to the needle bar.
in any particular ornamental stitch sewing machine the stitch pattern is made as wide as possible but the maximum width of the stitch pattern is limited to some fixed amount by the characteristics of the machine, for example, by the fact that the loop taker can accommodate only a certain lateral vibration of the needle and beyond this amount, will not cooperate with the needle. Having determined the maximum lateral vibration of the needle bar, the mechanics of the system determine the designed throw of the stitch pattern to obtain a desired lateral position of the needle. Because of the various limitations on the maximum lateral movement of the needle and on the design limitations on the mechanics of the system, it is often necessary to provide a separate set of stitch pattern cams for the different ornamental stitch sewing machines. It is an object of this invention to provide a Zigzag actuating mechanism that is designed to use a set of stitch pattern cams primarily designed for a different sewing machine and thus render a set of stitch pattern cams universally applicable to various sewing machines.
Further objects of this invention are to provide a zigzag actuating mechanism for a sewing machine, which mechanism is economical to manufacture, is easy to assemble and to adjust, and is efficient, dependable and durable.
Having in mind the above and other objects that will be evident from an understanding of this disclosure, the invention comprises the devices, combinations and arrangernents of parts as illustrated in the presently preferred embodiment of the invention which is hereinafter set forth in such detail as to enable those skilled in the art readily to understand the function, operation, construction and advantages of it when read in conjunction with the accompanying drawings in which:
FIG. 1 is a front elevational view of a sewing machine embodying the present invention,
FlG. 2 is a vertical sectional view longitudinally of the sewing machine of FIG. 1,
FIG. 3 is a sectional view taken substantially on the line 3-3 of FIG. 2,
FIG. 4 is a top plan view of the bracket arm of the sewing machine of FIG. 1 with the top cover plate removed,
FIG. 5 is a vertical sectional view taken substantially on the line 55 of FIG. 4,
PEG. 6 is a fragmentary detail view of the cam follower mechanism,
FlG. 7 is a fragmentary detail view of the amplitude adjustment mechanism,
FIG. 8 is a fragmentary sectional view taken substantially on the line 3-8 of FIG. 7, and
FIG. 9 is a fragmentary sectional view taken substantially on the line 9-9 of FIG. 8.
The present invention is herein illustrated and described as embodied in the sewing machine forming the subject matter of the copending application of Johnson, Serial No. 4,430, filed Jan. 25, 1960, wherein the machine is fully disclosed and to which reference may be had for a more complete understanding of the machine.
With reference to the drawings, there is illustrated a sewing machine having a frame consisting of a bed 1, a standard 2 rising from one end of the bed and carrying a bracket arm 3 that terminates in .a head 4. Journaled longitudinally of the bracket arm 3 is a main shaft 5 that is driven through a belt 6 frorn a motor 7 built into the standard 2.
In the head 4, there is a needle bar gate 8 having a pair of vertically spaced lugs pivotally mounted on a vertical axis pivot rod 1t) carried by bosses 11. The needle bar gate 8 has a pair of vertically spaced lugs 12 in which a needle bar 13 is mounted for endwise reciprocation. Endwise reciprocation is imparted to the needle bar 13 by a crank 14 on the head end of the main shaft 5 and connected by a link 15 to a collar 16 secured on the needle bar.
A needle 17 is secured upon the lower end of the needle bar 13 by a needle clamp 18. The top of the bed 11 is formed by a bed plate 19, the upper surface of which constitutes the work supporting surface of the machine and which, beneatth the head 1, is provided with the usual throat plate 20. Upon endwise reciprocation of the needle bar 13, the needle 17 penetrates work on the throat plate 2% and cooperates with a loop taker 21 in the bed 1 in the formation of lock stitches, and thereby defines the point of stitch formation on the work supporting surface of the machine.
The loop taker 21 is a vertical axis oscillatory hook having a hook body 22 formed with a loop seizing beak 23 and including a depending hook shaft 24 journaled in a bracket 25 in the bed 1. Oscillation is imparted to the hook 21 by a vertical axis shaft 26 journaled in the standard 2 and gear connected at its upper end to the main shaft 5. At its lower end, the shaft 26 carries a crank 27 connected to one end of a pitman 28 having its other end connected to one arm 29 of a bell crank lever pivotally mounted on the bracket 25 by a pivot screw 3% The bell crank lever has a second arm 31 connected by a link 32 to a crank 33 secured on the lower end of the hook shaft 24.
Work is advanced across the work supporting surface of the machine. past the point of stitch formation by a four-motion feeding mechanism including a feed bar 34 pivotally connected at one end to a rocker 35 on a feed advance rock shaft 36 which is oscillated in the usual manner by a pitman 37 actuated by an eccentric 38 on the main shaft 5. Feed lift motions are imparted to the feed bar 34 by a feed lift shaft 39 having at one end an arm 49 connected by a link 41 to the feed bar and having at the other end an arm 42 carrying a cam follower 43 that tracks an axial displacement cam surface at on the top of the crank 27. The feed lift is biased downwardly to effect lowering of the feed and to hold the cam follower 43 against the cam surface. 44 by a compression spring 45 acting between the arm 40 and the bottom of the bed plate 19. The feed bar 34 carries a. feed dog 46 acting on. the work through slots in the throat plate 2% to advance the work and thereby define the line of feed. The work is held down against the throat plate 20 and the feed dog 46 by a presser foot 47 mounted on the lower end of a presser bar 48 that is mounted for endwise sliding in the head 4 and is biased downwardly by a spring 49.
Upon oscillation of the loop taker 21, the loop seizing beak 23 thereof is moved through an arcuate path of travel. The needle 17, in the usual manner, is designed to pass adjacent to the path of travel of the beak 23 to effect loop seizure. With the needle bar 13 mounted in the gate 8, it is designed to be vibrated laterally of the line of feed so that upon alternate stitches it can descend at different points spaced laterally of the line of feed,
thereby defining ornamental stitching. To insure that the needle upon alternate stitches will be disposed in loop seizing relation to the beak 23, the axis of the pivot rod 10 about which the needle bar13 pivots is arranged coaxially of the hook shaft 24 about which the hook 21 oscillates.
A pitman 50 is arranged longitudinally of the bracket arm 3 and is pivotally connected to the needle bar gate 8 by means of a bracket 51 secured to the end of the pitman by a screw 52 and pivotally receiving a pin 53 secured in the needle bar gate 8; Thus upon endwise movement of the pitman 50, oscillation is imparted to the needle bar gate 8, thereby imparting lateral vibration to the needle bar 13.
Mounted in the bracket arm 3 is a vertical axis stud 54 on which is journalcd a tubular cam shaft 55 having on the lower end thereof a worm wheel 56 which meshes with a worm 57 on the main shaft for imparting rotation to the cam shaft upon rotation of the main shaft. On the upper end of the cam shaft 55, there is mounted a stitch pattern cam 58 having a peripheral pattern surface 59, which cam is releasably clamped on the cam shaft 55 by a screw 60.
With reference to FIGS. 5 through 9, there is mounted at the rear of the bracket arm a vertically arranged stud 61 which is secured at its lower end by a screw 62 in a bore 63 in a boss 64 of the bracket arm. The upper end of the stud 61 is supported by a top cover plate 65 that closes the open upper end of the bracket arm 3. Pivotally mounted on the stud 61 is a bracket 66 which is a sheet metal element consisting of a vertical body portion 67 having bent therefrom at right angles at its top and bottom, cars 68 and 69, which ears are provided with apertures 70 and 71 that slidably receive the stud 61. The bracket 66'is positioned vertically on the stud 61 by a sleeve 72 resting on an accurately machined surface 73 on the top of the boss 64 and having an accurately machined upper surface 74 on which the bracket 66 rests.
At a point spaced from the stud 61, the ears 68 and 69 of the bracket 66 are provided with apertures 75 and 76 that slidably receive a pivot pin 77. The pin 77 is held against endwise movement by a locking plate 78 lying on the top of the ear 68 of the bracket 66. The plate 78 has a rearward end that is bifurcated to provide a slot 79 that slidably receives the reduced portion of thestud 6-1 formed by a groove 80. Extending inwardly from the one edge of the plate 78, FIG. 6, there is a slot 81. The pin 77 has a groove 82 defining a reduced diameter portion that is slidably received within the slot 81. A screw 83 extends through the plate 78 and is threaded into the ear 68 to lock the plate 78 and thus lock the pin 77 in position.
Pivotally mounted on the pin 77 is an oscillating element in the form of a U-shaped plate 84 formed of sheet metal and arranged generally transversely of the bracket arm 3. The plate 84 is cut away, as at 85, to accommodate the main shaft 5 and the worm 57, thereby defining a base portion 86 and rearwardly extending arms 87 and 88 disposed respectively above and below the main shaft 5. The upper arm 87 is bent to form an ear 89 disposed in spaced relation above the upper ear 68 of the bracket 66 and having an aperture slidably receiving the pin 77. The lower arm 88 is bent to form an car 90 having an aperture slidably receiving the pin 77. The sleeve 72 is provided with a flange 91 having an accurately machined upper surface on which the ear 90 rests for positioning the plate 84 vertically. For rigidity, the base portion 86 of the plate 84 is provided with a laterally bent stiffening rib 92.
There is provided a cam follower 93 formed of sheet metal and pivotally mounted by means of a pivot screw 94 on an ear 9S bent from the top of the plate 84. At the forward end of the follower 93 there is an upstanding follower element 96 that is adapted to cooperate with the peripheral cam surface 59 of the stitch pattern cam 58. The rearward end of the follower 93 is bifurcated to provide a slot 97 that receives a reduced diameter portion 98 of the stud 61 to support the rear end of the cam follower against movement endwise of the stud 61 and to provide a sliding pivot for the same.
In the lower arm 83 of the plate 84 there is provided a slot 99 through which extends the one end of the pitman 50. On that side of the plate 84 opposite from the needle bar gate 8, there is mounted on the end of the pitman 50 a block 100 secured thereon by a screw 101.
The needle bar gate 8 is biased in a counterclockwise direction about the axis of the pivot rod 10 by a torsion spring 102 coiled about the pivot rod 10 between the bearing lugs 9. The one end of the spring 102 bears against the needle bar gate 8 and the opposite end is anchored in a collar 103 secured by a set screw 104 on the pivot rod 10. The collar 103 abuts against the top of the bottom one of the bearing lugs 9 and together with a head 105 of the pivot rod 10 serves to prevent end play of the pivot rod 10. The bias of the spring 102 tends to pull the pitman to the left as seen in FIG. 7.
The bracket 66 determines the center adjustment of the ornamental stitch pattern by varying the position of the pivot pin 77 which defines the pivot axis for the plate 84. Adjustment of the bracket 66 is provided by a handle 106 secured to the locking plate 78 by rivets 107. The handle 106 extends through a slot 108 in the front wall of the bracket arm 3 and through a slot 109 in a decorative indicia plate 110 secured by screws 111 on the front wall of the bracket arm. The plate 110 is provided with the letters L,".C and R, FIG. 1, to indicate the left, center, and right settings of the center adjustment. The plate 78 is formed of spring steel and acts to bias the handle 106 upwardly to seat the same in notches 112 at the various settings. To release the handle 106 from the notches 112, it is depressed against the spring action of the locking plate 7 8.
The spring 102 acts to exert a pull on the pitman 50 which, through the block 100, biases the plate 84 in a clockwise direction, as seen in FIG. 7, about the axis of the pivot pin 77. The plate 84, through the pivot screw 94, biases the cam follower 93 about its pivot axis defined by the stud 61 to engage the follower element 96 against the peripheral pattern surface 59 of the stitch pattern cam 58. Upon rotation of the stitch pattern cam 58, oscillation is imparted to the cam follower 93, the follower being moved in one direction by the pattern surface 58 and in the other direction by the spring 102. Through the pivot screw 94, oscillation of the cam follower 93 oscillates theplate 84 about the axis of the pivot pin 77. Through engagement of the plate 84 and the block 100, as the plate 84 is oscillated, the pitman 50 is pulled to the right, FIG. 7, in opposition to the spring 102 and is released for movement to the left under the action of the spring 102. Endwise movement of the pitman 50 imparts lateral vibration to the needle bar gate- 8. V
The amplitude of the endwise movement imparted to the pitman 50 and thus the lateral vibration of the needle bar, depends upon the setting of the block 100 radially relatively to the pivot axis of the plate 84. To vary the amplitude, the pitman 50 is adapted to be moved pivotally about the axis of the pin 53 to move the opposite end thereof along the slot 99 to position the block 100 between a maximum setting and a zero setting radially of the pivot pin 77. For this purpose, there is provided a zigzag amplitude adjustment lever 113 of the bellcrank type pivotally mounted by means of a shoulder screw 114, FIG. 5, on the lower end of the stud S4. The lever 113 consists of an intermediate portion 115 formed of spring steel and a handle portion 116 secured thereto by rivets 117. The handle portion 116 extends through a slot 118 in the front wall of the bracket arm 3 and through a slot 119 in a decorative indicia plate 120 secured by screws 121, FIG. 1, to the front wall of the bracket arm 3 and having numerals to indicate the setting of the zigzag amplitude. biases the handle portion 116 against the upper edge of the slot 119 to hold the lever 113 frictionally in its adjusted position. At its other end, the lever 113 carries 'a' block 122 secured to the spring portion 115 by a rivet 123 and by a screw 124 extending through the spring portion 115 and threaded into the block 122. The head of the screw is disposed in a slot 125 in the pitman 50 so that upon pivotal movement of the lever 113, the pitman 50 is pivotally moved to shift the block 100 along the slot 99.
The block 100 is formed generally cylindrical to provide a line contact on the plate 84 and it is provided with a slabbed face 126 on the side adjacent to the stud 61 to provide clearance relatively to the sleeve 72. At the zero setting of the zigzag amplitude adjustment, the end of the pitman Si) is disposed with the axis of the block 100 coaxial relatively to the pin '77. To determine this setting, the handle portion 116 abuts against the end 127 of the slot 119 in the plate 12% On the top of the block 160, there is provided an upstanding lug 128 having a cam face 129 that is adapted to engage the lower end of the pivot pin 77, as seen in FIGS. 8 and 9, when the zigzag amplitude is adjusted to zero for straight stitching. The cam face 129 retracts the pitman 50 against the action of the spring 162 and lifts the block 100 out of engagement with the plate 84, the plate 84 being provided with a cut-away 1341 to insure clearance between the plate 84 and the block 100 when at the zero amplitude setting. Thus, at the zero setting of the zigzag amplitude adjustment, any pivotal movement of the plate 84 will not impart any movement to the pitman 50 and the needle bar gate 3 is held in a straight stitching positi n by the spring 102 that biases the same into a stop position determined by the engagement of the cam face 129 against the pivot pin 77. At the same time, the bias of the spring 182 is completely removed from the plate 84 and thus from the cam follower 93 so that the follower element 96 will not track the cam surface 59, thereby eliminating unnecessary wear on the cam 5-8 during straight stitching.
At the maximum zigzag amplitude setting, the end of the pitman 50 is positioned with the axis of the block 100 disposed coaxially with the axis of the pivot screw 94. To position the mechanism accurately at the maximum zigzag amplitude setting and also as a gauge surface for assembly adjustment of the machine, the pitman 50 has an accurately machined face 131, FIG. 7, that is adapted to abut against the periphery of the stud 54. Thereafter, the plate 120 is mounted with the end of the slot 119 opposite from the end 127 engaging the handle portion 116, thereby locating the end 127 to determine the minimum setting.
The zigzag amplitude adjustment provided by the lever 113 is designed to vary the lateral vibration of the needle from zero, which is for straight stitching, and a maximum which in the present machine is approximately 0.160 inch (4 mm.). The two extreme positions at the maximum zigzag amplitude setting define the side edges of the zigzag field. The zigzag field or centering adjustment varies the straight stitching position when the amplitude adjustment is at zero, that is, the line of stitching will be placed in the center or along one of the side edges of the zigzag field. It also determines the position of the zigzag pattern within the field, that is, with the field adjustment at the center position, the lateral vibrations of the needle will be an equal distance upon each side of the center line of the field and, with the field adjustment at either the right or left positions, the lateral vibrations of the needle will be from either the right or left side edges of the zigzag field so that the one side of the pattern will be along one side edge of the field.
Upon actuation of the zigzag mechanism, the plate 84 pivots about the pin 77. Upon adjustment of the zigzag The spring portion 115 6. field by means of the' handle 106, the plate 84 pivots about the axis of the connecting or driving. screw 94 for the plate 84. To obtain the desiredcontrol of the zigzag amplitude and field, the displacement of the pin 77 by the field adjustment mechanism must be equal to the displacement of the screw 94 by the actuating mechanism. With the disclosed construction, it will be seen. that by the use of the cam follower 94, that is separate from the plate 34, the displacement of the screw 94 is lessthan the total throw of the cam 58. In this manner, there can be used cams which have a maximum throw that is greater than that which is designed for the particular machine, and which at the same time, will maintain the necessary condition that the displacement of the screw 94 and pin 77 be equal. The advantage of this is that cams primarily designed for a different machine can be used, thus making the cams universal.
The assembly of the present zigzag mechanism into the machine is also very simple. After the stud 61 is inserted, the sleeve 72 and bracket 66 are placed on it. Then, with the pitman 50 and the lever 113 assembled, the plate 84 with the cam follower 93 mounted thereon, is inserted, being careful to place the end of the pitman into the slot 99 and to insert the end of the cam follower 93 into the groove 98. The pin 77 is then inserted and locked by the plate 78, the plate being inserted with the stud 61 in the slot 7d and the pin 7'7 in the slot 81. The screw 83 is then inserted to lock the assembly.
Numerous alterations of the structure herein disclosed will suggest themselves to those skilled in the art. However, it is to be understood that the present disclosure relates to a preferred embodiment of our invention which is for purposes of illustration only and not to be construed as a limitation of the invention. All such modifications which do not depart from the spirit of the invention are intended to be included within the scope of the appended claims.
Having thus set forth the nature of the invention, what we claim herein is:
1. In a zigzag sewing machine having a frame, a needle bar, means for mounting said needle bar in said frame for endwise reciprocation and for lateral vibration, and means for imparting lateral vibration to said needle bar comprising a bracket, a pivot element pivotally mounting said bracket in said frame, an oscillating element, means for pivotally mounting said oscillating element on said bracket on a pivot axis parallel to and spaced from the pivot axis of said bracket, a pitman, means pivotally connecting said pitman to said needle bar, means adjustably connecting said pitman to said oscillating element for adjustment outwardly relatively to the pivot axis of said oscillating element, and means for imparting oscillation to said oscillating element comprising a rotary cam journaled in said frame, a cam follower slidingly pivoted on said pivot element and operatively engaging said cam, and means pivotally interconnecting said cam follower and said oscillating element at a point spaced from the pivot axis of said oscillating element for pivotally securing said cam follower and said oscillating element together at said point for unitary oscillation about the axis of said oscillating element.
2. In a zigzag sewing machine comprising a frame, a needle bar, means mounting said needle bar in said frame for endwise reciprocation and for lateral vibration, and means for imparting lateral vibration to said needle bar comprising a stud mounted at one end in said frame, a bracket pivotally mounted on said stud, a pivot pin loosely mounted in said bracket on an axis in spaced parallel relation to the axis of said stud, an oscillating element loosely mounted on said pivot pin for oscillation, said stud and said pivot pin having peripheral grooves, a locking plate having a bifurcated end defining a slot cooperating with the groove in said stud and a slot extending inwardly from the edge thereof and cooperating with the groove in said pivot pin to hold said bracket on said stud and to hold said pivot pin against endwise move ment, means for securing said locking plate to said bracket at a point spaced from said slots, a 'pitman, means pivotally connecting said pitman to said needle bar, means adjustably connecting said pitman to said oscillating element for adjustment outwardly relatively to the pivot axis of said oscillating element, and means for imparting oscillation to said oscillating element.
3. In a zigzag sewing machine comprising a frame, a needle bar, means mounting said needle bar in said frame for endwise reciprocation and for lateral vibration, and means for imparting lateral vibration to said needle bar comprising a stud mounted at one end in said frame, a sleeve mounted on said stud, a bracket pivotally mounted on said stud and positioned endwise of said stud by said.
sleeve, a pivot pin loosely mounted in said bracket on an axis in spaced parallel relation to the axis of said stud, an oscillating element loosely mounted on said pivot pin for oscillation, a flange on said sleeve and engaged by said oscillating element for positioning the same endwise of said stud, said stud and said pivot pin having peripheral grooves, a locking plate having a slot cooperating with the groove in said stud and a slot cooperating with the groove in said pivot pin to hold said bracket on said stud and to hold said pivot pin against endwise movement, a pitman, means pivotally connecting said pitman to said needle bar, means adjustably connecting said pitman to said oscillating element for adjustment outwardly relatively to the pivot axis of said oscillating element, and means for imparting oscillation to said oscillating element.
4. In a zigzag sewing machine having a frame, a needle bar, means for mounting said needle bar in said frame for endwise reciprocation and for lateral vibration, and means for imparting lateral vibration to said needle bar comprising an oscillating element, means for pivotally mounting said oscillating element in said frame and de fining a pivot axis for the same, a pitrnan, means connect- 8'. ing said pitman to said needle bar for imparting lateral Vibration to said needle bar upon endwise movement of said pitman, means defining an adjustable connection between said pitman and said oscillating element for imparting endwise movement to said pitman upon oscillation of said oscillating element and for varying the connection outwardly relatively to the pivot axis of said oscillating element between a maximum position and a minimum position, and means for imparting oscillation to said oscillating element comprising a rotary cam journaled in said frame and operatively engaging said cam, a cam follower element, means for pivotally securing said cam follower element to said oscillating element at a point spaced from the pivot axis of said oscillating element for relative pivotal movement about an axis parallel to the pivot axis of said oscillating element and for unitary oscillation of said oscillating element and said cam follower element at said point about the pivot axis of said oscillating element, and means for slidingly pivoting said cam follower in said frame on an axis parallel to and remote from the pivot axis of said oscillating element and the pivot axis of the means interconnecting said cam follower element and said oscillating element.
References Cited in the file of this patent UNITED STATES PATENTS 976,664 Laubenstein Nov. 22, 1910 2,684,649 Scarpa July 27, 1954 2,757,626 Fujita Aug. 7, 1956 2,832,302 Gegauf Apr. 29, 1958 2,833,233 DAmico May 6, 1958 2,905,119 Bono Sept. 22, 1959 2,972,319 Moro Feb. 21, 1961 FOREIGN PATENTS 27,253 Great Britain of 1896 517,363 Italy Feb. 28, 1955 792,784 Great Britain Apr. 2, 1958

Claims (1)

1. IN A ZIGZAG SEWING MACHINE HAVING A FRAME, A NEEDLE BAR, MEANS FOR MOUNTING SAID NEEDLE BAR IN SAID FRAME FOR ENDWISE RECIPROCATION AND FOR LATERAL VIBRATION, AND MEANS FOR IMPARTING LATERAL VIBRATION TO SAID NEEDLE BAR COMPRISING A BRACKET, A PIVOT ELEMENT PIVOTALLY MOUNTING SAID BRACKET IN SAID FRAME, AN OSCILLATING ELEMENT, MEANS FOR PIVOTALLY MOUNTING SAID OSCILLATING ELEMENT ON SAID BRACKET ON A PIVOT AXIS PARALLEL TO AND SPACED FROM THE PIVOT AXIS OF SAID BRACKET, A PITMAN, MEANS PIVOTALLY CONNECTING SAID PITMAN TO SAID NEEDLE BAR, MEANS ADJUSTABLY CONNECTING SAID PITMAN TO SAID OSCILLATING ELEMENT FOR ADJUSTMENT OUTWARDLY RELATIVELY TO THE PIVOT AXIS OF SAID OSCILLATING ELEMENT, AND MEANS FOR IMPARTING OSCILLATION TO SAID OSCILLATING ELEMENT COMPRISING A ROTARY CAM JOURNALED IN SAID FRAME, A CAM FOLLOWER SLIDINGLY PIVOTED ON SAID PIVOT ELEMENT AND OPERATIVELY ENGAGING SAID CAM, AND MEANS PIVOTALLY INTERCONNECTING SAID CAM FOLLOWER AND SAID OSCILLATING ELEMENT AT A POINT SPACED FROM THE PIVOT AXIS OF SAID OSCILLATING ELEMENT FOR PIVOTALLY SECURING SAID CAM FOLLOWER AND SAID OSCILLATING ELEMENT TOGETHER AT SAID POINT FOR UNITARY OSCILLATION ABOUT THE AXIS OF SAID OSCILLATING ELEMENT.
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Cited By (1)

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EA005358B1 (en) * 2002-08-09 2005-02-24 Общество с ограниченной ответственностью "Завод бытовых швейных машин" Zig zag mechanism for sewing machine

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GB792784A (en) * 1955-11-10 1958-04-02 Wittenberge Naehmasch Veb Zig-zag sewing machine for making diverse fancy seams
US2832302A (en) * 1952-05-31 1958-04-29 Singer Mfg Co Sewing machine
US2833233A (en) * 1954-05-27 1958-05-06 Singer Mfg Co Zigzag sewing machines
US2905119A (en) * 1953-04-11 1959-09-22 Vittorio Necchi Societa Per Az Zigzag control device for sewing machines
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GB189627253A (en) * 1896-12-01 1897-11-20 Arthur Appleby Improvements in Drive Chain for Cycles and other Chain Geared Vehicles.
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US2757626A (en) * 1951-10-06 1956-08-07 Fujita Kisaku Sewing machine
US2832302A (en) * 1952-05-31 1958-04-29 Singer Mfg Co Sewing machine
US2905119A (en) * 1953-04-11 1959-09-22 Vittorio Necchi Societa Per Az Zigzag control device for sewing machines
US2833233A (en) * 1954-05-27 1958-05-06 Singer Mfg Co Zigzag sewing machines
US2972319A (en) * 1954-08-06 1961-02-21 F Ili Borletti S P A Apparatus for obtaining in a zig-zag sewing machine an automatic displacement of thefabric apt to be amplitude adjusted
GB792784A (en) * 1955-11-10 1958-04-02 Wittenberge Naehmasch Veb Zig-zag sewing machine for making diverse fancy seams

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EA005358B1 (en) * 2002-08-09 2005-02-24 Общество с ограниченной ответственностью "Завод бытовых швейных машин" Zig zag mechanism for sewing machine

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