US942090A - Sewing-machine. - Google Patents

Description

mm m 7, 1909. 1. mm'a msn r '1.

W A max SEWING MACHINE. AP PLIUATIUN FILED APR. 18, 190B.

Magma WIA. MACK.

SEWING MAGHINE.

APPLIOATION' FILED APB.1B, 1906.

Patentad Dec.7,19 O9.

4 SHEETS-SHEET 2.

W. A. MACK.

SEWING momma ABPLIUATION FILED APR. 18, 1906.

Patented Dec. 7, 1909.

4 SHEETS-SHEET 4.

WILLIAM A. MACK, OF'CLEVELAND, OHIO, ASSIGNOB, TO OF CLEVELAND, OHIO, A CORP MACHINE COMPANY,

THE STANDARD SEWING ORATION OF OT-H'I)v SEWING-MACHINE.

To all zrfiom it may concern:

lie it known that I, WILLIAM citizen of the United States, of Cleveland, Cuyahoga county, State of Ohio, have invented certain new and use tut Improvements in Sewing-Machines, of which the followingis a specification.

The invention forming the subject-matter ol my present application relates to sewing machine feeding mechanism of the type (li closed in my pending application, tier. No. 37 395, tiled Nov. 3, .1900, in which the'fced of the work is effected by a feeding mechanism comprising cooperating work-engaging members, one of which is the needle; This type of feeding mechanism is' desirable in that it assures a uniform,.or substantially uniform, feeding movement of a plurality of plies of material.

The feeding mecha A. M non, a

nism of my said pending application con'iprises the needle, which is operative to have a combined reciprocating and vibrating movement, and two cooperating work-engaging feed-members op if erative at the upper and under sides of the work to engage or grip the work thercbe tween. As fully disclosed in said pending application, the upper feed-member is'provided with a needle-hole for the passage of lit) -the needle in its descent; through the work having one wall thereof arranged for enlgemeut with the needle during the work feeding operation to preve or springing of the needle under anv unto- :45 drag or strain produced by the engaged work.

bly surface of an.

e cooperating The undue feed -'member is prefera formed with a. work-engaging area at least equal to that of th upper feed--i11einber and is vided with an opening for the passage of the needle, which opening, in accordance with the invention formingthe subject-matter-of the present application, isalso formed with a wall arranged for engagement withthe needle at. its rear side during the feeding operation to prevent undue bending or springing of the same.

lteferringnow to the ings forming part of ti in which like parts'are designated by like reference characters,-Figure'1 is a side elevation of a sewing machine embodying my invention, with the bedplate in section, Fig. 2 is an enlarged front end elevation of the accompanying draw ns specification, and

nt undue bending accordingly pro- Specification of Letters Patent. Application filed April 18, 1906. Serial No. 312

and a resident t Patented Dec. *2, 1909. ,305.

same with the faceis a vertical section of the machine arm, F 4, also showing a bar. Fig. :t is a horiz the front end of the mach line st--=t of Fig. 3. .l igs'. views of the work-engagin feeding mechanism, partly in section, showing respectively the position of the parts at or about the beginning and ending of the feeding movement. F 7 and S are enlarget'l plan views of the work-engaging portions of the upper and lower feed members respectively. Fig. 9 is a detail perspective view illustrating the application of my invention to a two-needle machine.

The sewing machine head or frame comprising the bed-plate 1 and the overhanging arm 2, the app 1' or main driving shaft 3 supported in bearings in said arm, the lower shuttle driving shaft 4 supported in bearings onthe und er side of the bed-plate and driven from the upper shaft through the medium of operative connections, and

the rotary shuttle 5 driven from said lower shaft 4 through the medium 'of an interiediate shuttle-driver, are all substantially as found in the Standard sewing machine upon which, in the present instance, I have applied my improvements.

The lower member of my improved feeding mechanism consists of a horizontally r ciprocating feed-bar 6 having a projection or dog 7 attached thereto which projects through an elongated slot 8 in the throatplate 9 so as to engage with theunder side of the work. This feed-bar 6 adjacent to its opposite ends is supported and guided within a groove 10 in the under side of the bed-plate as clearly shown in Fig. 1, the same resting at one end .upon a roll 11 at tachcd to the front end of the bed-plate, and at its oppositeend. being pivotal] y con nected at Iii-with a short crank-arm 13 on the front end of a rock shaft 14 from which it receives its longitudinal movement. The two upper members of the feeding mechanism, consisting of the helper-bar 15 having a foot 16 cooperating with the dog 7 of the lower feed-member in gripping the work or material interposed between the same, and the needle-bar 17 carrying the needle 18 for entering the work, are-both loosely supported in hearings in the upper end of the 110 machine arm and adjacent to their lower'end passed through a block or gate 19, which latter is pivotally connected with a horizontally reciprocatin bar from which the helper and needle bars receive their lateralorfeeding movement.

- The bar 20 is supported to slide within a seat 21 in the lower end. of the machine arm,-

'j as clearly' shown in Fig. 3, and is operated from a cam or eccentric 22-011 the upper driving shaft in a manner as follows: A

f lever 23, mounted-on a short shaft 32 journaled in a lug '24 on one'side 'of the machine arm, 1s pivotally block therein which connects with the inner porting lug end of said stud 26 on the lever 23, and at its upper end is pivotally connected at,30 with theouter ,end'of a reciprocating pitman' rod 31 which is connected with and driven by the said cam? oreccentric 22 on the driving shaft. By such arrangement of parts, re; ciprocating movement is communicated to the bar 20 from the driving shaft 3, and by adjusting the pivot connection or stud 26 back and forth in the slot 25 the length of movement of said bar 20 and thereby the lateral throw of the helper and needle bars may be regulated.

-As a means for operating the lower feedbar 6 in unison with the upper feed members, the shaft 32 which carries the said lower lever 23 is'extended through the sup- 24 and provided on its rear end with, an. arm' 33 rigidly connected therewith, as shown in Fig. 1. The end of this arm 33 is bifurcated and engages with a roll or block carried by an arm at of a rock-shaft 35, which latter is mountedin bearings adjacent to the opposite ends of the machine and.

provided at its rear end with a second arm 36 which connects, through the medium of a 'pitman 37,- w-ith an arm 38 located on the said lower rock-shaft is, which latter is mounted in bearings on the under side of the bed-plate and provided with the arm 13 at itsfront end connecting with the feedbar 5, as before described. When the lever 23 is operated from the driving'shaft to receive a vibrating movement, its rigidly con- "nectedarm 33 is likewise operated and communicates'a rocking movement to the lower shaft 14 through the medium of theconnections described and so causes the arm 13 at the front end of said shaft to vibrate and give the feed-bar 6 its horizontal reciprocatin movement. The upper and rower mem ers of the feed being thus operated presser bar,

from the driving shaft through the medium of the-said lever 23, it will be understood that the one adjustment of the latter caused by the shifting of the stud 26 will. regulate the horizontal throw of both said upper and lower feed members and cause them to always move in unison whatever their length of throw may be.

lhe resser-bar 39 is held, in the usual. manner, with a normal downward pressure by means of a coiled spring 40 which has a hearing at one end against.- a wall of the machine a rm and at its opposite end against a block ll secured on said prcsscrlmr, as clearly shown. in Fig. 2. A block 42 is socured in rigid connection with the helperhar in position opposite the said block ll. on the presser and is provided with two l'orwardly projecting lugs 4:3, 43, on its l'aco side located one above the other. A three armed lever ii is arranged with one arm having apivotal connection with the pressurbar block 41 hymcans of: a pivot-screw 4-5, another arm extending loosely between the said lugs on the helper-bar block -12, and its third arm being l'iiturcatcd and embracing the lower end of an arm 46 which is secured on the end of a short shaft t? journuled in hearings in the upper front end of the machine arm 2. This shaft t7, as most clearly shown in F 1 and 3, extends through the arm 2 and is provided at its rear end with a second rigidly connected arm 48, which latter connects with the inner end of the eccentric rod 31 through the medium of a pitman 4:9.

in the operation of the machine, the inner end of the eccentric rod 3i receives a \cl'llcal or up and down movement which com municatcs a rocking movement to the slnll l 47 through the medium oi? the connections referred to, and so causes a laterally swing ring or Vilnnting movement to the lower end of the arm in at the front cud of said rockshul twhich operates the lover il in :1 limitner as will hereinafter be described. Tho prcsser-lmr 39 and hclpenlnu' l5 being op cratively connected lln'oughihc medium of the lever 44: in the manner dcsul'ilud, it. will be understood that tho prcsscr-lun' spring ll) serves to exert a yielding downward pressure upon the hcl 'ier-bur us \\ull as the vertical mow-nncnt of either one or both of sold ban-s being permitted by the sliding coi'incction of the uppcrbiiurcnted end of the lever t-t with the said vibrating arm 46 as shown. in order to raise the helper and presser bars for the purpose of releasing the work, the block 41 on tho presserdmr is adapted to be engaged by .n,

suitable lifting-device in-tlie usual manner, and, by reason of the lever ell-4.- connecting with the blocks on both of said bars and being guided by the arm 46 which is rendered stationary by the stopping of the machine,

lltl

llfi

the work is secured "both of the helper-bar is caused to be raised and lowered in unison with the pressenbar. Any suitable means might be employed for raising the presser and helper bars, one means, as herein shown, consisting of an elbowlever 50 which is pivotally supported upon the side of the machine at 51 with one end having connection with a vertically movable plate 52 which is arranged to slide upon the outer wall of the machine arm and provided with a lower inwardly turned end .53 projecting through an opening in the arm into a position beneath the presser bar block 39' so as to engage therewith, as clearly shown in 1*igr2, and the opposite end of said elbow lever extending downward through an opening in the bed-plate into a position beneath the latter to be operated by any suitable actuating means. The ordinary hand-oper ated lifting lever, indicated at 54, is also provided, the same as herein shown being adapted to engage with the inwardly turned end 53 of the plate 52 in raising the presserbar.

In the operation of the machine. as described, aftcr the work has been placed under the regular presser-foot in the usual. manner and the machine set in motion, the presser-foot will be raised from engagement with the work while the upper feed member or helper-bar with the lower feed member and grip the interposed work therebetween preliminary .to the feeding movement, as shown in Fig. 5. Such action ofthepresser and helper bars in respectively releasing and engaging in a manner as follows: The lever l t being rocked by the vibrating arm 46, when the helper-bar is lowered into gripping engagement with the work and becomes .stattonar the sa d lever is caused to pivot or fulcrum between the lugson the helper-bar block and so raise itsopposite end and the connected pressenbar. Upon the return 'swingot' said lever,'wh en the pressor reaches a position in engagement with the work, the lever will of course'fulcrum upon the pivot screw 45 in the presserbar block and so raise thehelper-bar. in

this manner, one bar is caused to be brolwht into holding or gripping engagement with the work before the other raises therefrom, the same bein in engagement with the work only as the lever 44 and its actuating arm 46 move past a central vertical line. To now continue with the feeding operation of the parts, after the work gripped between the u per and lower gripping members of the 'i'eed as described but before any forward movement of the some,

the' needle first descends through the work as shown in Fig. 5, assing through the needle openings 16 an 7' of the sai upper and lower feed members respectively, and,

while in the work and during 1ts movement will be caused to cooperate has been' to throw out the loop, is moved laterally with the said gripping members of the feeding mechanism and as a part of the latter to feed or carry the work forward. After the several members of the feeding mechanism have reached the limit of their feeding movement, as shown in Fig. 6, the needle first raises from the work and the presser moves downward into engagement with the latter, while immediately following such engagement, the helper-bar, "s before described, raises from its engagement with the work and is swung bzn-k\"ard into position to be again lowered into gripping engagement. with the work at the starting point of the feeding movemen i.

During the described feeding operation of the several cooperating wm-k-engaging parts of the feeding mechanism, the wall of the needle-opening in both the upper and under feed members is so formed as to provide a means for engagement with the needle at that side thereof which forms the rear side with respect to its direction of feeding movement, as shown in Fig. (i to prevent the needle being unduly bent or sprung under any drug or strain produced by the engaged work. It will of course be understood. however, that the said noedloopening of both the upper and under feed members is made sufficiently large to permit ot vertical passage therein 01' the needle in normal condition without frictional engagement with its walls, as shown in 5; the opening 7 in the lower feed member being shown in its needle engaging end to'permit ol the ready Withdrawal of the thread there through.

As illustrated in 1 to 8 inclusive,

ing machine employing but one needle. In

applied to'a machine employing a plurality of needles, as shown in Fig. 9, in which cvenisit is only necessary to provide the cooperating workengaging feed members with a, corresponding number of ncedlr penings, as indicated by 7" and 16 in Fig. 9, having Walls arrangedto cooperate with the needles during the feeding operation in the manner hereinbefore described. f W hat I claim is:

' 1. In a sewingmaehine a combined reciprocating and vibrating needle, two feed members having work-gripping surfaces opthereof and clamp it; therebetween and 00- operating with'the said needle to effect the feed of the work while the needle is in work, said two feedanembers each being the needle at ing operation, and means for operating said needle and feed members.

my invention as shown applied to a sew-- .erativeto engage the workat opposite sides the provided with means for engagement with its rear side during the feedthe present case as open at that end opposite some instances, however, the" invention is 2. In a sewing machine, a combined reeiplocating and vibrating needle, two feed members having work-gripping surfaces operative to engage the work at opposite sides thereof and clamp it therebetween and cooperating with the said needle to effect the feed of the work while the needle is in the work, said two feed members each being provided with a complemental needle-opening, and means for operating said needle and feed members.

3. In a sewing machine, a combined recip- 'rocating and vibrating needle, two feed members having work-gripping surfaces operative to engage the work at opposite sides thereof and clamp it thercbetween and. to

operatingwith the said needle to efiect the feed. of the work while the needle is in the work, said two feed members each being rovided with a complemental needle-openmg, means for operating said needle and feed members, and adjusting means common to both the said needle and feed members for effecting a like adjustment of feed movement to the same.

In testimon whereof I have hereunto set my hand this 13th day of April, 1006.

\VILL'LA M A. MAPK. \Vitnesses:

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