US1936971A - Trimming mechanism for sewing machines - Google Patents

Description

NOV- 28, 1933- i H. E. sMALLBoNE l TRIMMING MECHANISM FOR SEWING MACHINES Filed June 9, 1932 2 sheets-sheet 1 i Figuur 3'1- "5 ZSnvenfor attorney/J NOV. 28, H. E SMALLBONE TRIMMING MECHANISM FOR SEWING MACHINES Snventor Gttorneg/J Patented Nov. 28, 19.33

f ingaan l TRIMMrNc MEcHANi'sM For: SEWING MACHINES v y Harry E. Smallbone, New York, N. Y., assigner to Willcox 8 GibbsSewingfMachine'Colnpany,

New York, N. Y., =a corporation of` New `York 'Application :une 9, 19.32. serial! No. 616,330 i' 6 claims. (Grillz- 125) This invention relates to trimming mechanism for sewing machines and especially to suchmechanism designed for use in conjunction with a binder in the well-known lock-stitch machine of theWillcoX & Gibbs Sewing Machine Company to constitute a lock-stitch trimming and bindingy machine. f

The principal object is to provide a trimming mechanism of efiicient, simple and relatively in-r expensive construction, Whereof the reciprocating bar carrying the movable trimmer blade may be readily locked to its driving connections to be actuated thereby, ordetached from said driving connections and locked to a fixed part of the machine to thereby locate the movable trimmer blade and its associated parts in an out-of-the way position when trimming of the work is not desired- This and other objects and advantages which will be apparent fromfthe following detailed description, are realized by the embodiment of the invention illustrated in the accompanying drawings wherein- Fig. 1 is a front elevation of the left-hand end of the machine showing the needle part Way vup and the trimmer latch engaged with driving con-V nections which actuate the movable trimmer b ar and its blade;

Fig. 2 is a similar view,'but with the trimmer bar and its blade locked in an elevated out-of-theway position by engagement of thelatch with al Xed part or keeper on the machine frame;

Fig. 3 is an Fig. 8` is a perspective Vview jshowing*the latchV engaged with its Xed part yor keeper on the Referring to the drawings, 20 iscthe .machine base having supporting legs such as 21 (Fig. 3) .2 2 is the needle-hole plate having therethrough needle-hole 23 (shown in dotted lines in Fig. 3)

as well as slots 24 through which rows of teeth` of the'four-motion feed dog 25 operate in the' usual way to engage and feed the work. An opening through the top plate of the machine base 20, such as usually provided to aord access to the mechanism beneath, is closed by the .usual slide plate `26 (Figs. 1 and 3). 27 is an upstanding 'the fabric edge whichis to loe-trimmed before; la binding lisapplied and vsecured Avstitchfforming mechanism.

yrigs.V llana 4.

end elevation fromV the leftf of the latch respectively;

edge guide" secured Yto or formed'.ntegraillywitha plate 28. Screws 29 passingthrough a slot in plate 28 `adjustably secure `said guide 27 inthe desired positionto guide to the trimmer` blades 2.60 thereto byv the 35,is Lan-opening lthrough the base platei20 and stationary trimmer' blade adjustable. in a Lat'the right Vofthe forwardY end ofneedle plate 22, as shown in section in Fig. 2. 37 is the' lower,

groove 36 (Fig. 3) inthe face of` any upright plate 38, the, latter being rigidly supported f rirntl'iev .base plate 20 in a manner which it isunnecessary g isecured to the under 'side of base'plate 20 'byf a` vto here describe.` A piece othinsheet metaL; bent to iorm a rear wall -39 andja -side Wall 40,v is

bracket member 41 (Fig. 2) Saidwalls 39 `and 40 together with plate 38 constitute a troughlike `conduit for receiving trimmings of fabric moved by the. trimmer blade'. I a 50 is a part of theouter end ofthearm ofthe sewing machine frame to whichthe hollow head 51 of the machine 'is secured by threescrews 52, 53 is the maindriving shaftextending "horizontallythrough arm750 intogheadj,A 51 where it carries a trimmer bar driving eccenf tric 54 `I(Fig. 4)', a needle-bar'driving crank 55 (Fig. 3)"and a block 56, which latter rotates in and ,projects slightly from anopeningl in the. wall of the machinek head 5l. A ro-taryftake-up, notshown, is4 secured to block 56 by a screw 58 land aldowel pin'59.

f 60is the'V needle bar carryingxneedle 61 at. its

'lowerxend and driven from thecrank pin 62' on "crank 55by pitinan 63 which at' itsupper `end pivotall'yv engages vsaid -pin and at its'lower endv is yconnected byy a pivot screw 64 to a vertically movable slide 65 which latter 'at` one end is clamped to the needle bar 60 and atA its otherendI slides on the presser-foot bar next mentioned. f

66' is the presser-foot bar carrying presser-foot 'fpositioned to overlie' the needle-hole plate 22 f andpar-,ticularly the slotted portions thereof through which the rows of teeth of the feed mem# Y bei' operate.l The usual presserffoot liftinglever 68 is shown in Fig. 3. i

V"Moredetailed description and illustration of these parts of the mechanism is unnecessary.

"1A trimmer bar 70, vertically movable in upper'v head 5 1, carries at its lower" end a verticallyjreciprocating trimmer blade '73, adju'staloly clamped in placeby a clamp' plate '7 4 secured by `a screw '75, and a trimmings deflector plate 76 secured bearing 71 and lower bearing 72 `on the'machine y is a trimmer-bar actuating member inthe.

form of a sleeve embracing and freely slidable upon trimmer bar '70 below its upper bearing 71. The enlarged lower end of sleeve 80 has a projectof ball formation. During therunning of the 15 machine, sleeve 80 is constantly VreciprocatedV ver-A tically on trimmer bar 70 by a lever.86 (Fig. 4) fulcrumed at one end onthe machine frame by a screwY stud 87, at'its other end embracing the spherical portion of the stud 85, and at its middlev 20 embracing the eccentric 5e of the main shaft and being actuated thereby through the intermediary of upper and lower'bearing blocks 88; 88, slidable ,i in an opening in theiever closed at itstop by a cap plate 89.

Y A xed latch-member in the form of an upright bar 90, secured to the machine head by the screwsl 91, is curved at its upper end and termihates in a right angle extension 9 2 which constitutes a keeper adapted to be engaged by a latch next described.

Vforming a shoulder at 100. A latch support 101 embraces bar 70 immediately aboveand in conf (Fig. 5) so that it may be contracted by a screw 103 and thus clamped tightlyv to the bar.r An rextension 104 from support 101 engages Vthe aforesaid guiding slot 93 and thus prevents'turnfing of the trimmer bar on its axis during its vertical reciprocation.l Another extension 105 from support 101 has a circular extremity with a milled @top or gripping-surface.

' lA latch generally/in the form of a -bell crank,l

lever is best shown in Fig. 7. It comprises an up- Y rightarm 106, terminating at its upper'e'nd in a bent over extremity 107 adapted to engage either.

' Ythe notchSS of thel sleeve 80, or over the upper -fedge of extension or keeper 92, and a horizontal. arm 108 terminating in a circular part109`hav-M ving a milled bottom surface for gripping purposes. At .its middle said latch spans the latch 82 of thevsleeve 80. A coiledspring 112 is interposed between rthe `circular extremitiesof the extension 105 and arm 108 ofthe latch andtends to engage the latter in locking position.; either .450 with the notch 83 of the reciprocating trimmer sired to trim fabric-edges, the endr .10.7 of the 4latch" 65Y is engaged with notch 83 (as shown' in Fig. l) Aand' so held by Yspring 112,- whereby the. reciprocations of sleeve 80 are imparted through said latchY to the trimmer bar 70 and its movable trimmer On the other hand, When trimming of fabric is not required, the circular ends of x'ed blade '73.

f extension 105l and arm 108 of the latch lever are 4,gripped between the thumb and ringer and forced together against the pressure of spring 112 until @the latch .is disengaged from notch 88 .of the ing `guide nger `82 (Figs. 2 and 6), a transverse notch or groove 83 above said finger, and an ear. or lug'84 intowhich kis screwed a pivot stud 85 lmovable trimmer blades; a reciprocatory trimmer-bar carrying said movable blade; an actuat- `merbar carrying saidmovable blade; an'aCtuat- Y ber, or for connecting oarv to and discon- The lower portion of the trimmer bar 70 is ofk larger diameter than its upper portion, thereby 1 prising in combination, cooperating fixed and tact with said shoulder'loll and is splitat 102' trimmer sleeve. yThen the latch mechanism and along with it theparts ati the lowerend thereof (including the movable trimmer blade 73) are slid upward untily thelatch is engaged with its keeper 92 withall' of the parts in the position 80 ,shown in Figs. 2 and 3.' yIn this .manner the Vmovable trimmer blade-and associated parts may be quickly elevatedrto and locked in anoutof-the-way position when trimming is not required. The procedure can be quickly reversed when trimming is desired.. n Y

Whatv is claimed as new isy 1. Sewing machine trimming'mechanism comprising in combination, cooperatingv fixed and v prising inA combination,Y cooperating -ixed and movable trimmer blades; areciprocatory triming member for said trimmer-bar and, slidable thereon; and means carried by said trimmerbar and movable for either connecting said bar to or disconnecting it from said actuating memnecting it from al fixed partof the machine.

3. Sewing machine trimming mechanismcommovable trimmer blades; 'a reciprocatory. trimv mer-.bar carrying said movable blade; an actuat- 110 ing member .for said trimmer-bar and slidableY thereon; and a latch carried by said trimmer-bar for either connecting or disconnectingsaid bar and actuating member.. u

4. Sewing .machine trimming mechanism comprising inV combination, cooperating iixed [and movable trimmer blades; a reciprocatory trimmer-bar carrying said movable blade; an actuating member "for Ysaid trimmer-barY and slidable thereon; vand a latch for eitherconnecting said trimmer bar to said actuating .,member or connecting it to a fixed part of the machine out ,of action. Y

5. Sewing machine 'trimming mechanism comprising inv combination, cooperating Xed and Yv ractuating member to impart movementl ofy the latter to the bar, or to engage a'ixed part ofthe machine andtherebyhold the trimmer-bar out of action. l I o '6. Sewing machine trimming mechanism .comprising in combination, cooperating xedfand Ymovable trimmer blades; .a reciprocatory'trimmer-bar carryingsaid'niovable blade; an actuating isleeve for saidlbar. and slidable thereon; a latch carrier secured to said bar; `and a spring actuatedlatch pivotallymounted on vsaidlatch rcarrier and acting toerigage' either said actuating sleeve to impart movement therefrom to the trimmer-bar, .or .to engage ahmed-part ofjthe machine and thereby'hold! the trimmerf-barfout of actionpfl 1 -HARRY- SMALLBONE.

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