US2311222A - Zigzag sewing mechanism - Google Patents

Description

' Feb. 16, 1943.

J. GALKIN ZIG-ZAG SEWING MECHANISM Filed July 27, 1940 7 Sheets- Sheet 1 ED N . INVEN TOR.

ATTORNEY.

SEPH GALKIN Feb. 16, 1943. J.-GALKIN 2,311,222

ZIG-ZAG SEWING MECHANISM y I I Filed July 27', 1940 7 sheet -sheet 2- t v JOSEPH GALKIN g; INVENTOR.

ATTORNEY.

Feb. 16, 1943. J. GALKIN 2,311,222

ZIGv-ZAG szwxue MECHANISM Fil ed July 27, 1949 7 Sheets-Sheet s Fig-9 JOSEPH GALKIN I NV EN TOR.

BY W AW) ATTORNEY.

Feb. 16, 1943. J. GALKIN 2,311,222

zxe-zae SEWING MECH-ANISM Filed July 27, 1940 7 Sheets-Sheet e V g; 3 56 v w I 1 I an 1 N I '5 :2

| la I JOSEPH GALRIN 2 INVENTOR m mm BYWM

Feb. 16, 1943. J, N' 2,311,222

ZIG-ZAG SEWING MECHANISM Filed July 2?, 940 7 Sheets-Sheet 7 JOSEPH GALKIN "INVENTOR ATTORNEY Patented Feb. 16, 1943 UNITED STATES harem" OFFICE ZIGZAG SEWING MECHANISM Joseph Galkin, New York, N. Y.

Application July 27, 1940, Serial No. 348,034

Claims.

meshed engagement with a driven gear rotatably mounted below the work supporting base of the sewing machine, the driven gear shaft having an adjustable eccentric secured thereto and having a vibratable connection for imparting reciprocating motions to a slidably mounted feed-dog carrier and feed-dog and to the needle plate.

Another object of this invention is to provide means connecting the needle plate and the feeddog carrier for simultaneous to-and-fro movement, when the feed-dog is moved to-and-fro, the said connecting means being positioned to one side of the feed-dog so as to provide feeding teeth at the front and rear of the central portion of the feed-dog and on opposite sides of the needle.

Another object of this invention is to provide a vibratable connection for imparting high speed up and down, and sideways, and forward and backward motions of the feed-dog and needle plate.

Another object of this invention is to provide a cam having a shape which will cause momentary cessation of the transverse motions at each end of said motions.

Another object of this invention is to'providein combination with said momentary cessation cam and with said direct high speed drive, a needle-throat for centralizing the bobbin thread and to prevent breakage of said thread when very wide transverse movements are made by the needle.

This application is a continuation in part of my copending, abandoned application, Serial No. 281,471, filed June 27, 1939.

With the above and other objects in view, the invention will be hereinafter more particularly described, and the combination and arrangement of parts will be shown in the accompanying drawings and pointed out in the claims which form part of this specification.

Reference will now be had to the drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in which: I

Figure 1 is a side elevation of the improved zig-zag stitching machine.

Figure 2 is a bottom plan view.

Figure 3 is a top plan view of the needle plate slidably mounted in a cloth plate.

Figure 4 is a cross-sectional view, the section being taken as on line 4-4 in Figure 3.

Figure 5 is a cross-sectional View, the section being taken as on line 55 in Figure 6, and showing a thread control arm having an aperture for the bobbin thread in alignment with the needle.

Figure 6 is a fragmentary plan View of the sewing machine having the zig-zag mechanism applied thereto.

Figure 7 is a cross-sectional view, the section being taken as on line 11 in Figure 6.

Figure 8 is a plan view of the adjustable eccentric for adjusting the width of the zig-zag stitches.

Figure 9 is a cross-sectional view of the eccentric, the section being taken as on line 99 in Figure 8.

Figure 10 is a top plan view of a work supporting plate having an aperture centrally thereof for a needle-throat.

Figure 11 is a cross-sectional view similar to Figure 5, and showing the needle-throat extending upwardly to the upper surface of the work supporting plate.

Figure 12 is a bottom plan view of a sewing machine showing a modified zig-zag mechanism comprising a heart-shaped cam.

Figure 13 is an enlarged fragmentary plan view of the modified zig-zag mechanism shown in Figure 12, a bearing bracket being broken away to show a full view of the cam.

Figure 14 is a side view of the modified zig-zag mechanism shown in Figures 12 and 13.

In the illustrated embodiment of the invention, shown in Figures 1 to 11, inclusive, the numeral Ii) indicates a sewing machine comprising a base-plate H, and an overhanging arm l2 having a head I 3 at its free end. A main actuating shaft l4 mounted in the arm l2 through suitable connections imparts vertical reciprocatory movements to the needle-bar 15 whereby the needle I6 is reciprocated once for every rotation of the main shaft l4.

Secured to the base-plate H is a cloth plate I! having a guideway I8, preferably of dovetail form and positioned transversely of the line of stitching. The cloth plate I? has a rectangularly shaped aperture 19 in alignment with the guideway. An elongated needle plate 20 havcrank arms 32, 32.

ing two beveled side edges to fit into the guide- Way 13, has been slidably mounted in said guideway and has a stud 39 extending downwardly therefrom and passing through the aperture i9 below the cloth plate IT.

The needle plate has a needle opening and feed slots for a feed-dog 22, the needle being timed to cooperate with a hook or loop-taker 23 for the purpose of forming stitches, the hook being driven by a shaft 24. A presser-foot bar 25 is yieldably supported in the head l3 and carries a presser-foot 26 supported solely for up and down movements, as is well known in the art.

The feed-dog 22 has teeth formed therein by intersecting grooves which are positioned in right-angular relation to each other. The teeth 33 are pyramid-shaped.

As shown in Figures 6 and 7, the feed-dog 22 is fastened to the feed-dog carrier 2'? which comprises an elongated end portion 23 having a through cylindrical opening 29 for sliding engagement with a spindle 30. The spindle 3D is supported in offset relation from the rock-shaft 3| as is well known in the art.

The elongated portion 28 of the feed-dog carrier 21 may be slidably mounted on the spindle 30 as shown, or the spindle may be fastened to the carrier 21 and be slidably mounted in the The rock-shaft 3| functions to produce the back-and-forth movements of the feed-dog carrier 21 and the feed-dog 22 in conventional manner.

The up-and-down movements of the feed-dog 22 are produced by a rock-shaft having an integral crank arm 36 which carries a guide pin or spindle 31.

For the purpose of my invention, which is to provide an extremely simple mechanism for moving the feed-dog carrier and feed-dog and needle plate transversely of the line of stitching at high speed, I have formed an elongated through opening 38 in the feed-dog carrier 2! and have provided a stud 39 integral with and projecting from the lower surface of the needle-plate. In assembled relation the stud 39 passes through the clearance aperture l9 in the cloth plate I1 and engages with the walls of the slot 38 in the feed-dog carrier 21. In this assembled relation, when the feed-dog is moved transversely the needle-plate is simultaneously moved transversely by the feed-dog.

I have secured a drive gear 45 on the hook driving shaft 24 closely adjacent to the forward bearing of said shaft, and in meshed engagement with a driven gear 4| rotatably mounted on a vertical stud 42 fixed in the bed-plate H. The ratio of the gear to the gear 4| is four to one which causes the feed-dog to be moved transversely in one direction for one stitch and then transversely in the opposite direction for another stitch. The hook shaft 24 is rotated at twice the speed of the main shaft I4. An adj ustable eccentric 43 has been secured to the lower face of the gear 4|. A vibratable connection M has been connected at one end to the eccentric 53 by means of a ball-joint. The other end of the connection M has been connected to the feed-dog carrier 2] by means of a ball-joint.

As best shown in Figure 5, I have provided a thread control member 45 preferably made of round wire at one end and secured in the base I l by a screw 65. The control member 45 has been flattened at the end under the feed-dog 22 to clear the hook 23. The feed-dog end of the control member 45 has a vertical aperture 41 in alignment with the needle i6 for passing the needle and bobbin threads therethrough to prevent breakage of the said threads, which would be the case if the said thread control member were not used, since the transverse movements of the threads by the needle plate would cause interference with projecting portions of the hook.

Due to the pyramid-shaped teeth 33 at the central portion of the feed-dog 22, I am able to use a narrow presser-foot 25 and, as shown in Figure 1, one of the feed-dog slots 34 in the needle plate 20 is uncovered by the presser-foot 26. This permits operating very close to the edge of the fabric worked upon.

The adjustable eccentric 43 comprises a disk 50 having a T-shaped guideway 51 positioned diametrically therein. A T-shaped slide 52 has been mounted in the guideway 51. A screw 53 in threaded engagement in the slide 52 and freely rotably mounted in a yoke 54 is used to cause sliding motion of the member 52 to or from the center of the disk 59. A threaded aperture 55 in the slide 52 serves to receive a screw 56 having a ball formation thereon in engagement with the vibratable connection 44. The operator may, by adjusting the screw 53, vary the movements of the vibratable connection id from zero to maximum, and thus determine the width of the zigzag stitches.

As shown in Figures 10 and 11, I have provided a modified thread control member 58 having a tubular vertical extension 53. The extension 59 has a vertically positioned aperture 60 forming a needle-throat which is in alinement with the needle IS. The aperture 60 serves for passing the needle and bobbin threads therethrough to prevent breakage of the said threads due to transverse movements thereof. The tubular extension 59 passes through an elongated opening 6| in the work supporting plate 62 which is slid'ably mounted in a frame 53. The control member 58 is held stationary by the screw 46.

It is to be noted that the vertical tubular extension 59 has been made to terminate at its upper end in line with the top surface of the work supporting plate, as this prevents any frail fabrics worked upon from being drawn below said top surface.

It is also to be noted that while I have shown the drive gear 40 as mounted on the hook driving shaft 24, and the driven gear below the base, that I may mount the drive and driven gears above the base, and actuate the vibratable rod 44 by suitable connections (not shown) from one of said gears.

Referring to Figures 12, 13, and 14, it will be noted that I have provided a modified zig-zag mechanism 65 comprising a three-sided cam 66 having equal arcuate face and being adapted to cause momentary cessation of the transverse motions of the needle-plate at each end of said transverse motions. The cam has portions 61 and 68 which are concentric with the shaft 69. As best shown in Figures 13 and 14, a modified vibratable connection 14 has one ball-joint l5 vibratably connected to the feed-dog carrier 21. At the opposite end of the vibratable connection 14 is a ball-joint 1B. The shank of the ball on the balljoint 16 has a threaded end 11 and a portion 18 having parallel sides adapted for sliding motion in an arcuate slot I9 in a yoke 83. The center of the arc of the slot 19 is at the center of the ball-joint 15. A knurled nut 8| in threaded engagement with the threaded end 11 serves for securing the ball-joint 16 in any desired position in the slot 19.

The sliding radial adjustment along the slot 79 provides for increasing or decreasing the throw of the vibratable connection 14 for varying thewidth of the zig-zag stitching.

As best shown in Figures 13 and 14, the yoke 80 has been pivotally mounted on a stud bolt 82 preferably threaded in the base of the sewing machine. A bracket 83 secured to the base by a bolt 84 provides a bearing 85 for the lower end of the shaft 69.

In accordance with the patent statutes I have described and illustrated the preferred embodiments of my invention, but it will be understood that various changes and modifications can be made therein without departing from the spirit of the invention as defined by the appended claims.

It is to be noted that by vibratable connection is meant any connection which will transmit motion in the six directions herein disclosed, and which practically amounts to a universal connection.

As shown in Figure 12, it will be noted that the hook shaft 24 carries a bevel gear 86 which meshes with a bevel gear 81 on a vertical shaft 88. The upper end of the shaft 88 carries a bevel 1 gear 89 which meshes with a bevel gear 9!! carried by the main shaft of the sewing machine. The gears 90 and 89 are of a ratio of two to one. while the gears 81 and 86 are of a ratio of one to one. The ratio of the worm gear 48 to the gear 4| is four to one.

I claim:

1. In a sewing machine comprising a bedplate, a hook driving shaft and feed rock shafts, a feed-dog carrier and feed-dog mounted for sliding movements on spindles supported in paralllel spaced relation with both of said rock shafts, said movements being transverse of the line of feeding, a presser-foot supported solely for up-and-down movements, a cloth plate having guideways, said cloth plate having a rectangularly shaped aperture intermediate said guideways, a needle plate slidably mounted in said guideways and having a stud extending downwardly therefrom and passing freely through said cloth plate aperture, a drive gear mounted on said hook driving shaft and being in meshed engagement with a driven gear, said driven gear being rotatably mounted on a ver-- tical stud fixed in said bedplate, means for converting rotary into reciprocating motion mounted on said stud, a vibratable connection having ball joints at opposite ends, said vibratable connection being joined at one end to said motion converting means, said vibratable connection being joined at the opposite end to said feed-dog carrier for imparting direct transverse to-and-fro movements from said driven gear to said feed-dog carrier and feed-dog and permitting high speed up and down as well'as forward and backward andsideways motions of the feed-dog carrier and feed-dog, said feed-dog carrier having an elongated through opening and said stud extending into contacting relation with the walls of said opening, said stud being positioned externally of said feed-dog and serving to connect said needle plate and said feed-dog carrier for simultaneous to-and-fro movement, when said feed-dog carrier is moved to-and-fro.

2. In a sewing machine comprising a-hook driving shaft and feed rock shafts, a feed-dog carrier and feed-dog mounted for sliding movements on spindles supported in parallel spaced relation with both of said rock shafts transverse of the line of feeding, a cloth plate having guideways of dovetail form, said cloth plate having a rectangularly shaped aperture intermediate said guideways, a needle-plate having two beveled ,side edges slidably mounted in said guideways and having a stud extending downwardly therefrom and passing freely through said cloth plate aperture, a drive gear mounted on the hook driving shaft and being in meshed engagement with a driven gear, said driven gear being rotatably mounted on a vertical stud fixed in the bedplate, means for converting rotary into reciproeating motion mounted on said stud, a vibratable connection having ball joints at opposite ends, said vibratable connection being joined at one end to said motion converting means, said vibratable connection being joined at the opposite end to said feed-dog carrier for imparting direct transverse to-and-fro movements from said driven gear to said feed-dog carrier and feeddog and permitting up and down as well as forward and backward and sideways motions of the feed-dog carrier and feed-dog, said feed-dog carrier having an elongated through opening and said stud extending into contacting relation with the walls of said opening, said stud being positioned externally of said feed-dog and serving to connect said needle plate and said feed-dog carrier for simultaneous to-and-fro movement, when the feed-dog carrier is moved to-and-fro, said feed-dog having an aperture centrally thereof, and a thread control member fixedly mounted in alinement with said central aperture means and having a vertical extension in alignment with the needle, said extension passing through said aperture to the upper surface of said needle plate, said extension having a vertical aperture and forming a needle-throat for passing the needle and bobbin threads therethrough to prevent breakage of said threads during their transverse movements.

3. In a sewing machine comprising a bedplate, a hook driving shaft and feed rock shafts, a feed-dog carrier and feed-dog mounted for sliding movements on spindles supported in parallel spaced relation with both of said rock shafts, said movements being transverse of the line of feeding, a presser-foot supported solely for up and down movements, a cloth plate having guideways, said cloth plate having a rectangularly shaped aperture intermediate said guideways, a needle plate slidably mounted in said guideways and having a stud extending downwardly therefrom and passing freely through said cloth plate aperture, a drive gear mounted on said hook driving shaft and being in meshed engagement with a driven gear, said driven gear being mounted on a vertical axis in said bedplate, a rotating member secured to said gear at its lower face, a vibratable connection having ball joints at opposite ends, said vibratable connection being operatively connected at one end for operation by said rotating member, said vibratable connection being joined at the opposite end to said feed-dog carrier for imparting direct transverse to-and-fro movements from said driven gear to said feed-dog carrier and feeddog, said vibratable ball-jointed connection being adapted to permit high speed up and down as well as forward and backward and sideways motions of the feed-dog carrier and feed-dog, said feed-dog carrier having an elongated through opening and said stud extending into contacting relation with the walls of said opening, said stud being positioned externally of said feed-dog and serving to connect said needle plate and said feed-dog carrier for simultaneous toand-fro movement, when said feed-dog carrier is moved to-and-fro.

4. In a sewing machine comprising a bedplate, a hook driving shaft and feed rock shafts,-a feeddog carrier and feed-dog mounted for sliding movements on spindles supported in parallel spaced relation with both of said rock shafts, said movements being transverse of the line of feeding, a presser-foot supported solely for up and down movements, a cloth plate having guideways, said cloth plate having a rectangularly shaped aperture intermediate said guideways, a needle plate slidably mounted in said guideways and having a stud extending downwardly therefrom and passing freely through said cloth plate aperture, a drive gear mounted on said hook driving shaft and being in meshed engagement with a driven gear, said driven gear being mounted on a vertical axis in said bedplate, a cam secured to said gear at its lower face, a yoke pivotally mounted below said bedplate and being in engagement with said cam, a vibratable connection having ball joints at opposite ends, said vibratable connection being operatively connected at one end to said yoke, said vibratable connection being joined at the opposite end to said feed-dog carrier for imparting direct transverse to-and-fromovements from said driven gear to said feed-dog carrier and feed-dog, said vibratable ball-jointed connection being adapted to permit high speed up and down as well as forward and backward and sideways motions of the feed-dog carrier and feed-dog, said feeddog carrier having an elongated through opening and said stud extending into contacting relation with the walls of said opening, said stud being positioned externally of said feed-dog and serving to connect said needle plate and said feed-dog carrier for simultaneous to-and-fro movement, when said feed-dog carrier is moved to-and-fro.

5. In a sewing machine comprising a bedplate, a hook driving shaft and feed rock shafts, a feed-dog carrier and feed-dog mounted for sliding movements on spindles supported in parallel relation with both of said rock shafts, said movements being transverse of the line of feeding, a cloth plate having guideways, said cloth plate having a rectangularly shaped aperture intermediate said guideways, a needle plate slidably mounted in said guideways and having a stud extending downwardly therefrom and passing freely through said cloth plate aperture, a drive gear mounted on said hook driving shaft and being in meshed engagement with a driven gear, said driven gear being mounted on a vertical axis, a cam secured to said gear, a yoke in engagement with said cam, a vibratable connection operatively connected at one end to said yoke, said vibratable connection being joined at the opposite end to said feed-dog carrier for imparting direct transverse to-and-fro movements from said driven gear to said feed-dog carrier and feed-dog, said vibratable connection being adapted to permit high speed up and down as well as forward and backward and sideways motions of the feed-dog carrier and feed-dog, said feed-dog carrier having an elongated through opening and. said stud extending into contacting relation with the walls of said opening, said stud being positioned externally of said feed-dog and serving to connect said needle plate and said feed-dog, carrier for simultaneous to-and-fro movement, when said feed-dog carrier is moved to-and-fro.

JOSEPH GALKIN.

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