US2145216A

US2145216A - Two-needle button sewing machine

Info

Publication number: US2145216A
Application number: US125522A
Authority: US
Inventors: Voliman Joseph; Gunther Hermann
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1937-02-13
Filing date: 1937-02-13
Publication date: 1939-01-24
Anticipated expiration: 1956-01-24

Description

Jan. 24, 1939 J. VOLLMAN ET AL TWO-NEEDLE BUTTON SEWING MACHINE 5 Sheets-Sheet 1 Filed Feb. 15, 1937' Ubllmm Guerrilla) MN. a

Jan. 24, 1939. J. VOLLMAN ET AL TWO-NEEDLE BUTTON SEWING MACHINE Filed Feb. 13, 1937 3 Sheets-Sheet 2 tlb' eph Uollman Hermann aw aw (w kw n'he r Gum;

Jan. 24, 1939. J. VOLLMAN ET AL TWO-NEEDLE BUTTON SEWING MACHINE 3 Sheets-Sheet 5 Filed Feb. 15, 1937 3mm Jog cpl; Uollmarv [Jermann Gun her Patented Jan. 24.1939." f 2 ,145,216

UNITED STATES PATENT OFFICE 2,145,216 2 2 Two-NEEDLE nu'r'ron SEWING Joseph Vollnian and Herman Gunther, Eliza-' beth, N. J., asslgnors to. The Singer Manufacv turlng Company, Elizabeth, N. J., a corporation of New Jersey Application February is, 1937, Serial no. 125.522

1 Claims. (01. 112-412 The present invention has for an object to proone to the looper-shaft ll journaled in the bed I. vide an improved two-needle button sewing ma- The looper-shaft carries the axial-shank l2 ofchine for sewing on four-hole buttons with two one of the loopers l2, which loopers are of the simultaneously formed but entirely disconnected rotary chain-stitch type. The axial shank I2 I groups of button-fastening stitches; there being of the other looper 12 is carried by a short looperi no cross-threads between the two groups of shaft I3 journaled in the bed-bracket l4 coaxially stitches at either side of the work. with the first mentioned looper-shaft II. The With the above and other objects in view, as bed-bracket I4 is detachably fastened to the bed will hereinafter appear, the invention comprises I by means of the screws and has also journaled 10 the devices, combinations and arrangements of in it the transmission shaft l6 which receives 10 parts hereinafter set forth and illustrated in the motion from the looper-shaft H through the accompanying drawings of a preferred embodispur gears l'l, I1 and drives the short looper-shaft ment of the invention, from which the several 13 through the spur-gears I8, I8; the two coaxial features of the invention and the advantages atlooper-shafts II and I3 being connected to run 16 tained thereby will be readily understood by those at the same speeds and in timed relation to onell skilled in the art. another.

Fig. 1 is a side elevation, partly in section, of a The two loopers l2 are of right and left hand two-needle button-sewing machine embodying but otherwise identical formation. Each has a the invention. Fig. 2 is a bottom plan view of the pg k 9 and D- p d ng win 20 machine. Fig. 3 is a bottom plan view of the 20. The shank or spindle l2 of each looper is 20 throat-plate of the machine, showing the duplex mounted in a socket in the respect v E thread-cutting and thread-end-nipping mechashaft. Each looper is formed adjacent the base nism carried thereby. Fig. 4 is a section on the of its Suppo g shank or sp with an line 4-4, Fig. 1. Fig. 5 is a perspective view of arcuate loop-spreading shoulder 22 the function 25 the looper-carrying bracket shown in Fig. 2 at of which is to hold the inclined limb of the pre- 28 the free end of the work-supporting arm of the viously seized needle-loop high enough so that the machine. Fig. 6 is an enlarged view showing the looper-beak will, after seizing a new needle-loop, cooperation of the needles, loopers and loop-posipass it through the previously seized loop, as tioning and spreading means at the time in a shown in Fig 6, 7 andB- 30 stitch-forming cycle when the loopers are seizing Cooperating with the needles 9 and loopers I2 30 new needle loops and are about to pass such loops I is a loop-positioner 23 in the form of a Y-shaped through the previously seized loops on the respecmember the stem 24 of which is curved in a vertive loopers. Fig. 7 is a view of the parts as seen tical plane, Fig. 6, about the loopers l2 and is from the left side of Fig. 6. Fig. 8 is a similar supported by the rock-shaft 25 which is journaled View of the partsasseen from above with the butin the bed I below the looper-shaft H. The ton and work-supporting parts omitted, and Fig p t l car e a earn which 9 is a view similar to Fig. '7 but at a time in the actuates the follower-roll ll at the end of thecycle when the new needle-loops have been drawn follower-arm I I9 fixed to the rock-shaft 25.. The out and are about to receive their customary halfcam l I moves the loop-positioner- 23 from the o twists by the wings of the respective loopers. retracted position, shown in dotted lines in Fig. 40

The sewing machine has a frame of usual con- 6, to its effective position shown in full lines in struction comprising a bed I, from which rises the Figs. 6, '7 and 8. 'The cam. l IP is timed to advance standard 2 of the overhanging bracket-arm 3' the loop-positioner as soonas the needle-loops 21' terminating in the head I. have been well drawn down or expanded by the 4:, Journaled in the bracket-arm 3 is the rotary loopers l2, as shown in Fig. 9. The divergent main-shaft 5 which, through the crank 6 and link horns of the Y-shaped lOOD-D 23 gather I, drives the reciprocatory needle-bar 8 carrying together the limbs of the previously seized and the spaced eye-pointed needles 9. The spacing expanded needle-loops 21 and position them in of the needles 9 is equal to that of the holes of a a bunch 28 between the paths of the needles 9 four-hole button, so that by vibrating the button which descend at opposite sides of the stem 24 of 50 transversely of the plane of the needles, two sepathe loop-positioner and the bunched limbs '28 of rate groups of button-fastening stitches may be the needle-loops positioned thereabove. The sewn through the four holes in the button. loop-positioner 23 remains in its advanced posi- I'he main-shaft 5 is geared one-to-one to the tion until the loopers have seized new needlevertical shaft in which, in turn, is geared one-toloops 29 d caried them safely t ou h the 'reii spective previously formed loops 21. By referring to Figs. 6 and 7, it will be observed that the arcuate loop-spreading shoulders 22 of the loopers l2 hold the inclined portions 30 of the needleloops high enough for the beaks I9 of the loopers to pass therebelow.

Secured upon opposite sides of the stem 24 of the loop-positioner 23 are the needle-guards 3| which are spaced suniciently from the stem 24 to admit the needles 9. The needle-guards 3| prevent the needles from being accidentally struck or caught by their respective looper-beaks. The stem 24 of the loop-positioner also has a needle positioning function in holding the needles correctly spaced apart for the loop-seizing action of the loopers.

The button 32 is held upon the fabric 32 by the button-gripping jaws 33 of the usual buttonclamp 34 which includes the work-supporting plate 34' and is vibrated transversely of the plane of the needles 3 by the usual clampshifting mechanism such as disclosed in U. S. Patent No. 1,093,241, of Apr. 14, 1914. Such mechanism includes a feed-cam 35 which is given a slow rotary motion by the worm-andgear connection 36 with the main-shaft 5. The feed-cam of the present machine is designed to vibrate the work-clamp laterally of the bed I; no motion being imparted to the work-clamp longitudinally of the bed I.

On the rearward end of the main-shaft 5 are mounted the usual tight and loose pulleys 31, 38, respectively, of a common form of start-andstop-motion device including the starting and stopping lever 39 which is pivoted to the machine frame at 40 and carries the belt-shipper 4| and stopping tooth 42; the latter cooperating with the usual notched stop-cam 43. The details of this stop-motion device are more fully disclosed in U. S. Patent No. 1,093,241 above referred to.

The machine is fitted with thread-cutting and thread-end-nipping mechanism, such as disclosed in U. S. Patents No. 1,251,451, of Dec. 25, 1917 and No. 1,549,248, of Aug. 11, 1925. In the present instancethe thread-cutters 44 are right and left counterparts and are carried by the thread-cutter lever 45 which is fulcrumed at 46 on the under side of the throat-plate 41 and actuated in the usual manner as disclosed in said patents. The thread-end nippers 48, also right and left counterparts, are carried by the usual thread-end-nipper lever 43 which is fulcrumed at 50 on the throat-plate 41 and is actuated by the usual connections with the feed-wheel 35 as disclosed in said U. S. Patent No. 1,549,248.

We are aware that two-needle straightaway stitching machines have been proposed having two rotary chain-stitch loopers of rightand left-hand formation arranged face-to-face for cooperation each with its respective needle. Such two-needle stitch-forming mechanism has not, however, been heretofore made to function in combination with a button-clamp for vibrating the work in opposite directions across the plane of the needles. It is, of course, simple enough to form a succession of single thread chain-stitches with a rotary chain-stitch looper when the work is fed in the direction of motion of the looperbeak in seizing a needle-loop.

In making a back-stitch, that is, a stitch mad when the feed of the work is opposite to the direction of motion of the looper-beak in seizing a needle-loop, difficulties are encountered and a loop-positioner must be resorted to to carry the limbs of the previous needle-loop held by the looper to the opposite side of the needle, so that the looper-beak may seize a new loop from the needle before passing into the previous loop held spread by the looper. No loop-positioning means has or have, however, been heretofore provided which will function in combination with two needles and two face-to-face rotary chain-stitch loopers in the production of two entirely separate groups of button-fastening stitches.

The foregoing specification is to be read in an illustrative sense and not in limitation of the invention; it being obvious that various modifications within the scope of invention will occur to those skilled in the art.

Having thus set forth the nature of the invention what we claim herein is:

1. In a two-needle button-sewing machine, in combination, stitch-forming mechanism including a pair of coplanar reciprocatory needles and two opposed rotary chain-stitch loopers, a buttonclamp, means to relatively vibrate the needles and button-clamp transversely of the plane of the needles, and means to simultaneously position the limbs of both expanded needle-loops relative to their respective needles so that each looper after seizing a needle-loop from its respective needle will pass it through the previously seized and expanded loop on the looper.

2. In a two-needle button-sewing machine, in combination. stitch-forming mechanism including a pair of coplanar reciprocatory needles and two opposed rotary chain-stitch loopers, a button-clamp, means to relatively vibrate the needles and button-clamp transversely of the plane of the needles, and means to simultaneously position the upper portions of the limbs of both expanded needle-loops between the descending needle-paths in carrying such limbs across the plane of the needles in the direction in which the looper-beaks move to seize new needle-loops.

tion the upper portions of the limbs of both expanded needle-loops between the descending needle-paths in carrying such limbs across the plane of the needles in the direction in which the looper-beaks move to seize new needle-loops.

4. In a two-needle button sewing machine, the combination with a pair of reciprocatory needles, of two opposed rotary chain-stitch loopers, a button-clamp and means to vibrate it transversely of the plane of the needles, and means to position the limbs of the two expanded needleloops between the paths of the descending needles following a movement of the button-clamp in a direction opposite to the direction of loop-seizing motion of the looper-beaks.

5. In a two-needle button-sewing machine, in combination, stitch-forming mechanism including a pair of coplanar reciprocatory needles and two opposed rotary chain-stitch loopers, a button-clamp, means to relatively vibrate the needles and button-clamp transversely of the plane of the needles, a Y-shaped loop-positioner having its stem transverse to the plane of the needles, and means to move said loop-positioner lengthwise of its stem across the plane of the needles to a position in which said stem lies between the paths of the needles.

6. In a two-needle button-sewing machine, in combination, stitch-forming mechanism including a pair of coplanar reciprocatory needles and two oposed rotary chain-stitch loopers, a button-clamp, means to relatively vibrate the needles and button-clamp transversely of the plane of the needles, a Y-shaped loop-positioner having its stem transverse to the plane of said needles, and a pair of needle-guards carried by said loop-positioner and disposed at opposite sides of and spaced from said stem.

'7. A button-stewing machine having a pair of needles, rightand left-hand rotary chain-stitch loopers arranged face-to-face for cooperation with said needles, a button-clamp, means to vibrate said button-clamp transversely of the plane of the needles, and means to position the spread limbs of both needle-loops at that side of the plane of the needles toward which the newly seized needle-loops are carried by the loopers.

JOSEPH VOLIMAN. HERMANN GUNTHER.