US2234295A - Sewing machine - Google Patents

Description

March 11, 1941. N. WALDMAN ETAL SEWING MACHINE 2 Sheets-Shoat 1 Filed May 16, 1939 Z I I [flu/III IIIIIA'IIIIIIIIII/ March 11, 1941. N WALDMAN v 2,234,295

SEWING MACHINE Filed may 16, 1939 2 Sheet s-Sheet 2 Patented Mar. 11, 1941 UNITED STATES PATENT OFFICE 2,234,295 sswme MACHINE 'Nathan'waldman and Emeric Polimac. Chicago,

IIL, assignors to Ge rge I. Goldwyn and Herman Gold in; business under name Brothers both of Chicago, Ill c ers do-' arid style of Goldwyn 4 Claims, (G1. 112%162) This invention relates to improvements in sewing machines and especially to commercial sewing machines, which are operated at relatively high speeds and-are subject to hard usage and it consists of the matters hereinafter described and more particularly pointed out in the ap-' pended claims.

The invention is especially concerned with power sewing machines for forming an overcast or overedge stitch through cooperation between the needle'and the the manner well known. is well adapted for sewing in connection with relatively heavy material such as burlap bagging and asan example thereof, attention is directed to' the Goldwyn and Waldman Patent #2313384 of September 10, 1935. I

One of theobjects of the present invention is to provide a machine of this kind which may be has heretofore been possible and at the same time provide means for efficiently lubricating the rapidly moving parts and guard them against the entrance of dust and other foreign particles produced in sewing operations upon used burlap bags.

Another object of the invention is to provide a sewing machine of this kind wherein the parts are reduced to a minimum for simplicity and low cost production and which parts are so arranged that higher speeds are practicable, partly through a novel gearing embodied in the operating mechanism of the machine and partly through the provision for an automatic lubricatlonoi said parts.

as well as others; together with the several advantages 'thereof will more fully appear as the specification proceeds.

in the drawings:

Fig. l is a longitudinal vertical sectional view through the operating parts of a sewing machine embodying the preferred form of the invention.

Fig. 2 is a transverse vertical sectional view through a part of the sewing machine as taken on the line 2-2 of Fig. l.

Fig. 3' is a fragmentary top plan view on an enlarged scale of he bed or base plate of the sewing machine and associated parts therein.

Fig. 4 is a detail vertical sectional view through a part of the mechanism of the sewing machine as taken on the line 6-6 of Fig. 3.

Fig. is a detail view in end elevation, on a scalereduced .from that of Fig. 3, of the feed hand end wall M.

The above mentioned objects of the invention,

7 13 whereby said shaft may pinion, which faces toward said mechanism of the more fully referred to later.

Referring now in detail to that embodiment of the invention illustrated. in the accompanying drawings, in indicates as a whole the substan- 5 tiall'y elongated rectangular bedor base plate of the machine adapted for attachment in any suitable manner upon a support such as a bench or table, not shown herein. the bottom'of an open what irregular shape and of a substantial height, the greater part of said casing-forming a mechanism compartment 42. The open top end of the casing is faced off to be engaged by the bottom sewing machine and-will be end of the upright hollow standard portion B of 5 a substantially horizontally disposed hollow arm 7 M. This hollow arm terminates in a head IS, the open end of which is closed by plate IS.

a removable The casing H includes longitudinally extend- 2Q ing upright front and rear walls I! and IS, intermediate walls l9 and. 20, and an upright right Said casing also includes left hand offset end wall portions 22-23 which connect the ends of the wall is with the walls is and 5 ll respectively and a short left hand end wall portion 2% that connects the wall with the wall ll. This arrangement of the wall portions best appears in Fig. 3. The wall portions i9, 20 and 23 cooperate to define a recess its left hand end and in which recess, as will later appear, are located the looper and loop spreader of the mechanism of the sewing machine. Rising from the bed plate near the open end of the recess 25 is a boss 25 arranged coaxially with the needle of the sewing machine and to later.

A horizontally disposed'shaft 21 is arranged longitudinally in the casing, in line with the wall part l8 and drive shaft of the sewing machine. This shaft extends through and is journalled at one end in the wall as and extends through and is journalled at its other end in a boss Zia on theend which will be referred wall it of the casing. Said shaft also extends through and is journalled at a point between its ends, in an upright boss 28 on the bed plate [8. A pulley 29 (see Fig. 2) is connected to that end of the shaft 2? outside of the standard portion.

suitable source of power.

A pinion 30 is fixed to the shaft 21 between the boss 28 and the wall 2| and the hub of this wall is made as an eccentric 3|. A thrust bearing top casing H of a some- 10 25 that is open at 30 which shaft constitutes the main 40 be driven from a 3 2 is arranged V I the (see Fig. '1 is fixed to the base plate 'I'he hubs 4| of the gears 36 and 3", each carry a crank pin 43 and 44 respectively. "This arrangement best appears in Fig. 3.

A- vertically disposed pump casing or barrel 45 with and below the eccentric hub! I.

5 for the pum indicates a rock shaft arranged parallel with and adjacent the -wall conventional manner. The feed plate mechanism just described appears in Fig. 5. d I and 62 indicate the rock shaftsfor the loopalso located the needle boss 26 before mentioned, on the bed plate.

The looper rock shaft 6|, \yhich is journallcd near its ends in bearing bosses and 66 respectively, is also arranged in substantially a hori- An arm "between the bosses 6364 which is operatively connected to the chrank pin 44 on the hub of the bevel gear 36. It is apparent that when the shaft 21 is being driven, a rocking movement is imparted to both rock The looper and above mentioned cooperate nection with the loop the loop spreader just with an associated needle 74 in forming the stitch 3 overcast or overedge stitch.

In theformation of the stitch, the needle when descending, carries its thread through the fabric or bagging to a point below the throat plate (not shown). needle is ascending, slack made and which is an isposed wall 11. The shaft I4, where it 'joins the is formed as a splash portion'of the hollow arm bottom end of the head well'or recess 8|.

A pinion 82 is boss 18 and this stub shaft 84 that is operatively end in a boss 85 in the standard l3.

The'pinions 30 and 82 are the same in size.

The needle on its nextv the invention involved herein, they are not shown.

"Therefore the shaft 15 is driven from the shaft 21 in the same direction and at a i to 1 ratio. The conduit 47 before mentioned has its top end directed to discharge into the chamber IS. A part of the bottom walll'l of said chamber, in line with and above the pinion 82 is somewhat thickened and a hole 86 is formed therein. In the wall 80'there isv provided a longitudinal passageway 81 whereby communication is afforded between the chamber 15 and the interior of the head l5. To fill the chamber Iii with a lubricant, an opening is provided in the top wall of the hollow arm 14 near the wall 89 and a plug 88 is removably secured in said hole. In that face of the wall 80 that opens into the head it there is provided a vertically disposed groove 98, the passageway 81 opening at one end directly into said groove.

91 indicates the needle bar of the machine-that is disposed in the head l5 and is mounted in the top and bottom portions thereof for a verticallyreciprocating guided movement. The bottom end of this bar carries the usual clamp (not shown) whereby the needle 16 previously mentioned is operatively secured to said bar. A head block 92 is secured to a part of the needle bar within the head and this block includes a stub shaft 93 that carries a roller 9d which in turn has a vertical guided movement in the groove 95 before mentioned.

That end of the shaft '85 extending into the head if has a disc 95 secured thereon and said disc is of such diameter as to dip into the well or recess 8!. The disc 95 carries'a crank pin 96 and one end of a pitman rod 9? is journalled on said pin and the other end of said pitinan rod is journalled on the stub shaft Q33 between the head block 92 and the roller 96 respectively.

Of course, the usual presser foot bars, tension devices and other parts that are conventional in overcast sewing machines are employed in the present machine, but as such bars, devices and parts are not essential to an understanding of being driven, it will function through the gears 3B, 83 and 82 respectively to drive the shaft i5 at the ratio and in the direction before mentioned. As the shaft I5 is thus being driven, it is apparent that the crank 96 through the rod 971 will produce a reciprocating movement of the needle bar 9i and its associated needle.

In the rotation of the shaft 2'5, it will through the bevel gear 33 drive the two companion bevel gears 36 and 3! in opposite directions and this in turn through the mechanism before mentioned will rock the shafts 69 and 62 so that the looper 1i and the loop spreader 12 will be caused charge oil into the chamber it. A part of the oil in the chamber 18 will drip down through the hole 85 onto the pinion 82 and from there down to the gear 83 and the pinion 30 so that these pinions and the gear run in a stream of oil.

- a lubricationof that end of the shaft 75 journalled in the boss and a part thereof will drain into the well M. The oil in this well is thrown back upwardly by the disc 95 so'that ample lubrication of adjacent parts is assured.

When the well 8! is filled, the excess will overflow therefrom to run down into the base and a part of this oil will discharge or drip upon the thrust bearing 35 and associated parts in the base whereby they are efficiently lubricated.

It is apparent that the greater number of parts are rotary ones and that they are thoroughly lubricated. Thus, it is possible to run the machine at higher speeds and with less wear on said parts so that the machine functions to producev a greater number 01 stitches in less time than heretofore possible in an overcast stitch sew- While in describing the invention, we have re-;

ferred in detail to the form, arrangement and construction of the parts thereoi', the same is to be considered only in the illustrative sense, so that we do not wish to be limited thereto except as may be specifically set forth in the appended claims. f

We claim as our invention:

1. In a sewing machine, the combination of a casing, a shaft 'in said. casing and journalled at its ends in upright portions thereof, an upright boss in said casing in which said shaft is journalled, a bevel gear fixed to said shaft adjacent said boss, a rockable looper and loop spreader arranged outside of said casing for cooperating with the needle of the sewing machine in forming stitches, rock shafts for the iooper and the loop spreader respectively arranged in the casing, other bevel gears arranged on said boss and meshing with and driven by said first mentioned bevel gear, means carried by said boss and upon which said other bevel gears are journalled, and means operatively connecting said rock shafts to said other bevel gears and translating therotation of said other bevel gears into rocking movement of said rock shafts.

2. In a sewing machine, the combination of a casing, a shaft in said casing and 'journalled at its ends in upright portions thereof, an upright boss in said casing in which said shaft is journailed, a. bevel gear fixed to said shaft adjacent said boss, 2. rockable looper and loop spreader .arranged outside of said casing for cooperating with the needle of the sewing machine in forming stitches, rock shafts for the looper and the loop spreader respectively arranged in the besing, other bevel gears arranged on said boss and meshing with and driven by said first mentioned bevelled'ge'ar, studs arranged substantially in the plane of the axis of said shaftand fixed to and extendingoutwardly from opposite sides of said boss and upon which said other bevel gears are journalled, a crank arm on each of said other bevel gears, a rock arm on each rock shaft and a rodconnecting each crank arm with a rock arm.

3. In a sewing machine,-the combination of a casing, a shaft in said casing and journalled at its ends in upright portions thereof, an upright boss in said casing and in which a mid portion of said shaft is journalled, a bevel gear fixed to said shaft adjacent said boss, a rockable looper and loop spreader arranged outside ofsaid casing for cooperating with the needle of the sewing machine in forming stitches, rock shafts for the looper and the loop spreader arranged in said casing, other bevel gearsarrangedjon said boss and meshing with and driven by the first mentioned bevel gear, means providing laterally exat its ends in upright portions thereof, an upright boss in said casing in which said shaft is journalled, a bevel gear fixed to said shaft ad jacent and facing said boss, a rockable looper and loop spreader arranged outside of said casing for cooperating withthe needle of the sewing machine in forming stitches, rock shafts for said looper and loop spreader respectively, arranged in the casing, studs arranged substantially in the plane of and extending at a rightv angle to the axis of said shaft, means for operatively securing the inner end of each stud to opposite sides of the boss, other bevel gears one associated with each stud and meshing with and driven by the first mentioned bevel gear, antifriction bearing means between each stud and its associated beveled gear, means associated with each studand the bevel gear thereon for holding the associated bearing in place and through said bearing holding the associated gear against endwise displacement from its stud, a crank arm on the outer end of each of said gears on said studs, a rock arm on each rock shaft and a rod connecting each crank arm with a rock arm. I

' NATHAN WALDMAN.

EMERIC POLIMAC.

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