US1797822A - Sewing machine - Google Patents

Description

March 24, 1931. A. F. CARLSON SEWING MACHIIINE Filed Sept. 27, 1929 2 Sheets-Sheet 1 VWM, ATroRNEYs,

March '24, 1931. A F, CARLSON '11,797,822

SEWING MACHINE Filed Sept. 27, 19129 2 Sheets-Sheet 2 l NVENT OR l G2/MQW ATTORNEYS.

Patented Mar. ze, ieei `FFICE y lAXEL FOIRE-CARLSON, or` CAMBRIDGE, MASSACHUSETTS, y fissienon ro Renon SHOE MACHINERY COMPANY, or BOSTON, MASSACHUSETTS, e CORPORATION or MAINE SEWING MACHINE Application filed September 2 This invention relates to welt sewing machines, and as herein illustrated, is adapted more especiallyv toa welt'sewing machine, for example a machine oi' the vclass known as 5 welt-and-turn machine for the' stitching of shoes. An example of this class 'of machine is the Reece weltery whereinthe shoe upper is stitched'to the lip of the insole and to the "i0 Zaleski AWelt strip, exempliedV by the patents Ot et al. No. 1,288,366 ofDecember 17, L1918`,.and No. 1,361,952 otDecember 14, 1920,

is to provide an improved means for effecting the cutting ofthe thread and the holding of the thread end in readiness Jfor the commencing of :a new seam, the same being effectedV by a manual'moveinent of the work or thread Y after the termination of a seam and the pull- `ing out of a certainamount ofthi'ead Afparticular obj ect is to afford a convenient and effective thread cutting means or thread holding means, or the two combined, appli-` cable to a machine provided with mechanism for severing orholding the end of a welt strip after the completion of the seam. `My priorA applicationNo. 280,504, filed May 2.5, 192,8,

illustrates a Reece welting machine containing mechanism for severing'and holding the end'of the welt, operable by a manual movement after the completionofwthe,stitching and the stoppageof the machine, and the present invention is illustrated as an-additional improvement upon or attachment tol the particular machine shown in Vsaid application. 4 l Other objects and advantages ofthe present invention willbe pointed outin the here- 1 iiiafter following description of anillnstra'- tive embodiment or will be apparent to those skilled in the subject of welting.machines.l

To the attainment ofthe' aforesaid objects and advantages, the present Yinvention consists in the novel welt sewing machine and the .Y gripped the welt',

7,1929. serial No. 395,667.'

novel 4features of combination, arrangement, operation, Yconstruction and detail as herein illustrated or described.

In the accompanying drawings Figure 1 is a general left elevation of a portion of a Reecev welt sewing machine embodying the present invention, this. corresponding substantially` with Figure 1 of sai-d application 280,504, modified toV incorporate the present invention@ only the attachmentv containing the vthread vcutting and holding lmeans of the 'present invention, thesame on an enlarged scale and turned upright for lconvenience of illustra- Fign is a "front elevation kof the parts f shown in Fig. 2, asseencfrom the right side Fig. 4 is an v underneath seen in Figs. 2 and 3. 1

'Fig'. is a view similar to. Fig. 2, ,but showing separately the ixed bracket member carrying the movable parts. f

Fig. `6 is a view similar Vto Fig. 5 showing` the unlatohing member detached. y

Figi 7 is a similarview showing the thread cutter detachedf i v Fig. 8 kis a similar View showing the thread holder detached. Y

The figures yareshown with their parts inl the position occupied by them after the mach'in'ehas stopped, the operator has tripped the welt'severing and holding mechanism, vthe welt gripper has come forward and the welt knife has cut the welt and retracted, and the' thread cutting and holding "mechanism is in readiness Jfor opeiationby a manual movement of the work andthread in 'accordance' with the present invention.4 y

YIn oneaspect the lpresent invention may be outlined as comprising, in a sewing machine, a thread' cutter or blade, and a thread holdview of the parts yer, with means for latching *thecuttei and Vholder in their set positions, spring means for operating thecutte'r and holder when unlatched anda shiitable member engageablebytheY pulled out thread between the stitching point and the work adapted to be Fig. 2 -is also a left-elevation but showing Y.

shifted by the thread for unlatching the latch means and thereby effecting the cutting and holding of the thread end.

The position of the shoe S is indicated in Fig. 1. The shoe upper U and the insole lip L are to have attached to them the welt W in this class of machine. The type of machine may be that comprising a tall post with an upper frame portion or head 11 carrying fore-and-aft frame walls, the wall 12 corresponding with the left frame wall of the Zaleski et al. patents.

The main or stitchingshaft 18 may be a crank -shaft having connections (not shown) extending to the several stitching instruments A needle 19 is shown oscillating about an axle 20 and operated for example as in the Zaleski patents tov penetrate the Welt, upper andLA lip, receive the lthread from a looper, and. retract to draw the thread through the work in each stitch cycle. The feed may be effected as usual through the aid of a feed point 21swung rearward and frontward 'aboutv a; horizontal feedY bar or slide 22 extending right and left and operated from the main shaftto reciprocate along the direction of feed by a movement equal- Y lingv the length of a single stitch. A looper,

take-up and other usual stitching instruments and operating connections will be understood, or ascertained from the prior patents.

The Welt gripper or holding device 29 shown as comprising an under jaw 30 and an upper jaw 31 each provided with serrations or better gripping the leather. One of the jaws, preferably the upper jaw, is swingable for opening and closing the gripper, and is shown pivoted at 32 to the shank of the lower aw.

Y The lower gripper jaw 30 is formed Vat the forward end vof a sliding shank 37, the rear end of which slides through a guiding block 38 which is swivelled gripper as a whole to be swung right and left for purposes tobe described. Near its rear end Vthe shank carries a stop pin 40 striking against the block 38 and. limiting the forward movement of the gripper.` Theshank at-its left side carries a stud 41 pressed upon by a spring 42 tendingY always to throw the shank and gripper'device rearwardly to the normal or retracted posit-ion.

The further details of the welt grip-per are not necessary to be described, as said application can be referred to for a full description thereof, and this applies also to the welt severing blade and its details of mounting andi actuation.`

The several motions ofthe gripper' and the blade are effected from a single oscillating actuator which is put through its rocking movements at theprop'er bracket 15 be-y time and is `mounted on thel neath the shank` of the gripper. The actuator 1s. oira rock shaft 7 8fextending transupon-the portiony i, '-lof the bracketxl, thus permitting the 45 versely, and at its left end, or the rear end of Fig. 1, is provided with a crank 7 9 whereby the shaft may be rocked in a forward direction or clockwise through an arc of about O more or less.

The arm or rocker 81 on the shaft 78 carries an arc flange 82 which thrusts the gripperforwardly. The shaft also carries a separate rocker arm 85 for actuating the knife and closing the gripper. `Other portions need not be described. f i

The forward and return rocking motion of the actuator parts are shown effected from a power drivenshaft under control of the hand. The shaft carries a worm 96 enga ing worm wheel 97 on one of the shafts 18 o? the machine. A second worm 98 on the shaft 95 engages a worm Wheel 99. which constitutes the driving memberV of aclutch, the driven memberv 100 of which is in the formV of a disk or wheel inside the wheel 99 and revolving on a shaft or axle turning in a circular bracket projecting leftward from a bracket 14 se.

cured at theleft sideof the frame wall 12. The operation isfsuch that the Wheel or drivcounterclockwise direction in Fig. l and at a speedfor. example of 150 R. P. M. more or less, thus making a singlerotation in something'under .oneY half second. The clutch driven member carries a crank orpin 101 and,

`as willbe explained, istarranged to make a loscillating the rocker crank upwardly and downwardly to give the rocking parts the 90C" more or less rocking motionI referred to. The connecting rod 102 is coupled by universal joints at its upperV and lower ends to its respective cranks on account of the differences 1n planes of action.'

making a single rotation and stop and need not be described in detail. The driving member has its web formed with a number of apertures '104,each of which may be engaged so as to quicken the closing' of the clutch.

stop dog 105zis carried on the driven clutch member being pivotedv thereon by a pin 10G which also constitutes a clutch pin adapted to engage in one of the apertures 104. A flat* spring 107 presses the dog andpin to the right, tending to engage the clutch. The dog has aV tilting movementjwhioh prevents its reengagingthe stopping part until a full turn has taken place.

Cooperating with thev dog A105 is a clutch latch or hook'109 in the form of aslever pivoted upon a bracket portion 14".. A finger 11() secured to the shaft of the latch lever 109 is Y connectedby a spring 111 with the' bracket,

ing clutch member 99' turns constantly in",

ioo

Y n 11o The Vclutch may be of a well known type` lthus tending to throwv the latch'109-fin posi-V tion to engage and stop the clutch driven member. The latchfhas a downwardly extending tail 113, the vlower end of which has Van offset thin contact flange 114.

I In order to throwthe latch and permit the clutchto close for one revolution at will the followingmanually controlled device may be,y

' hold the contact in the normal position shown in Fig. `1. The bent arm is mounted on a tulcrum shaft or axle 121 having its bearings in extensions'17 at the lett side of the frame wall 12. There also projects from the axle an operating lever or controller 122 which extends downwardly and to the left in easy access to the operator. By this arrangement, if the clutch control lever 122 is thrown up by the hand of the` operator, or by a portion of the work or shoe held in his hand, this operates toelevate the contact 116 which enages against the inclined contact 114 on the tail of latch lever 109, thus `lifting the latch lever. .1

The actuating contact 116 on its downward return movement can yield and pass behind the contact 114 and thus avoidV conflict. The lifting of the latchlever 109 frees the V'dog 105. The spring 107 throws the clutch pin 106 to the right and it engages in one of the apertures 104, whereupon the driving clutch.

99 rotates the driven clutch member 100. `At the end of a single rotation,preferably within a fraction of a second the dog 105 strikes the latch lever 109, which yfirstly cams the l `dog and clutch pin to the left, thus releasing ,the clutch and thereuponl etl'ectsy a positive stoppage of the driven clutch member. During thisjrotation the .connecting rod u 102 causes the rocking actuator 78-85'to swing y'forwardly from the normal position shown in Fig. 1 and then swing back again to normal. W I

Coming now tothevmech'amsm incre particularly constituting the present invention,v

this is shown mounted upon a bracket `attached to the left side ofthe'frame wall 12 and extending downwardly at a rear slant to bring the cutter, the holder and the .latch adjacent to but slightly to the left of the stitchingv point, as'will rbe clearly seen in v Fig. 3. The bracket 170, as shown separately in Fig. 5, is formed with a 'kerf .'171to receive the pivoted thread holder,A The lower part of the bracket is formed with a sharpened edge 172 constituting a 1blade cooperating 1 Y with the cutter to be described. Formed near the lower end of ythebracket andl extending through the kerf partthereof is shown a pivot hole 173 receiving the pivot Ator the cutter and holder.

Further up is shown -a 1 stud hole 174 for a guide stud to be described, y

`also in dotted lines a stud hole 175-formed in the r'ear part ofthe bracket.

rlhe cutter 176 is seen'inV Figs. 2 and 3 and separately in Fig. 7. This is a rocking member formed with a hub 177 turning on a pivot stud to be described engaging the hole 173. The cutting edge 178 of the cutter cooperates with the edge'172of the bracket. The cutter is extended above its pivot and the extension is formed with a hole 17 9 to receive the stud j of a spring. A further extension 180 constitutes a tail by which` the cutter is latched in the open position shown in Fig. 2. At the lower part of the cutter adjacent its cutting edge is shown a'holef181 receiving a pin 182 which extends to theright so as vto be able to contact and operate the thread holder to be described.

The cutter yand holderare preferably operated by the snap action of a spring and -fory this purpose a'pin 183 is shown engaged in the hole 179, with a coil spring 184 extending Yfrom thefpin to ya pin 185 extending leftwardly" from an extension bracket 186 attached at the right sideof the bracket 17 0 `with a holding screw 187 engaging the stud holej175`at the right side of the bracket. The cutter swino'snabouta pivot 188 which as seen inFig. 3 has an enlarged head overlying the cutter, a shank of substantial diameter en gaging the aperture in the cutter hub 177,

` a threaded stud portion engaging in theleft part of the main bracket, and therebeyond an v unthreaded portion extending through the kerl? Vand forminga pivot for the thread;

holder. f f I The ithreadholder 189 is shown as a small swinging plate fitted' within the kerf 171 of I the bracket,-its" rounded lower edge 190 cooperating withthe lower bevelled edges of the .kerf as seen in Fig. 4, where the thread T is lightly pinched between the holderand ythe bracket and has'been cut by the cutter. Theholder also has a stud. hole 191-by which it isengaged upon the pivotstud 188 whichy constitutes Aalso the pivotor thefcutten The holder is extended above as atail 192 forming a stop contacting vthe bottom of the kerf as shown in Fig. 2.v

The thread holder 189 is so arranged as to l be engagedand thrust by the pin 182 on the cutter, so that when the cutter is actuated by its spring 184 the same actuation thrusts the holder into holdingrp'osition. VVhen the parts are restored to the latched or set position as seen in Fig. 2, Vwith the spring 184 under tension, the holder may be withdrawn to its -normal or open position by means of a spring 193. The described parts are normally set or held in latched position by means ot' a latch bar 194shown in' Figs. 1, 2 and 3. This latch has a slot 195 engaging over a stud on the unlatchingvmember to be described, and the latchhas a downwardly extending tooth or shoulder 196 which normally engages and holdsl the latch extension lor tail 180 of the cutter against the tension of the spring 184. The parts are thus held in set position until released.

Upon release it will be understood that the spring 184 pulls the cutter tail 180 forwardly, that is, to the right in Fig., 2. After actuation the parts may be'reset by thrusting the 198 is formed with a slot 200 engaging over 2o.

a stud 201 formed at a midway point on the upward-ly and downwardly reciprocating g connecting rod 102, so that a complete up and down movement of the rod will cause the rocking of the bell crank andL thereby the forward and return movements of the latch bar for resetting Jthe cutting and holding mechanism. I l s The preferred embodimentof this invention includes Va .shiftable unlatching member which is operable by the movement of the shoe inthe hand of the operator bef-ore the i thread has been cut. This is preferably. a

i welt severing and gripping mechanism and inA Cil movement elfected after the operation of-the such a manner that the thread,` between .the stitching point and the work, may be caused releasing of the cuttingand holding means, so that the actuating .spring will operate them to cause the cutting and holding of the thread.

This feature isshown embodied herein by Y an unlatching bar 202 shown in left elevation inFig. 1 and in a similar view, but broken 'away in F 2, in front view in Fig. 3 and Y Ydetached'in Fig. 6. This is a shiftable bar and may be movable for eXample'rin an upward direction toeifect thevunlatching operations. Y It is shown as having a notch 203 at `its lower end to facilitateV the engaging and, pressing of the thread'against the bar to lift Y Y it.

It is formed with two offsets as seen in 3 to accommodate the cutter and its mountings. It is also apertured or slotted at 204 and 205 to receive certain studs. It has a forward extension 206 to receive the end of a light spring 207 connected to a stud 208 for assisting gravity to pull down on the bar.

The guide slot 204 is shown as engaging a Y guide stud 209 having its shank pass throughY the slot and thence threaded into the outer end of thestudr 188. The guide slot 205 engages a stud 210 liXed in the bracket 170.

Near the center of the unlatching bar Y202 A., is a threaded hole 211 carrying astud-212, the

inner end of whichcarries a roller'213 engaging in the slot 195 of the latch barv 194. By

`this arrangement the latch bar may reciprocate forward and rearwardly for resetting purposes while the unlatching bar may be,

lifted and thereby raise the latch bar to disengage the tooth 196 from the tail 180 of the cutter to permit theY cutting and holding operations.

The operation has been generallyvindicated, but may be further explained as follows After the stitching of a shoe and the let up of the welt, leaving the welt'end held firmly :for

the next stitching operation` as` shown in Fig. 1. n The shoe is now free to be pulledl out further, in order to Vdraw Vmore thread Ifrom the supply. The further operation is best explainable'on Fig. 3 where the path of the barbed needle is indicated at 19 andthe position of the looper at'23`. The thread T is seen extending through the looper and thence out leftward to the position of the work held in. l the hands of the operator. It is only necesto bear against the unlatching member which L is thereby movable in a manner to effect the sary for 'the operator to lift the shoe soas to bring the thread within the notch 203 of the unlatcher or bar 202,A as indicated by thethread line T, and thereupon pull upwardly` upon the work and thread until the latterjswingsinto the posit-ion indicated at T. This lifts the unlatcher bar and thereby disenga ges the `tooth 196 from the latch tail 180 of the cutter. The spring 184 thereupon operates the cutter and through the cutter operates the holder. These'parts therefore are snappedinto cutting and holding-position as shown in Fig. 4, in which position the path ,of the thread will remain at T in Fig. 3.V

Theholding of the thread is not a positive gripping but isa firm frictional holding that will enable the thread to be pulled out vafter one or -two stitches have been formed in the starting of a new seam. It will be noticed from Fig. 2*.that the cutter blade opens slightrly wider than the' holderso that a receivingr recess for the thread is left between the fixed part of the bracket and the open holder. The notch 203 for receiving the thread at the foot with the thread receiving recess or jaw ofthe open holder and cutter, so that when the operator swings the thread up into thepositionT in Fig. 3, engaging the notch 203, thcthread ofthe release member 202 is in a direct line necessarily enters the jaw or recess of the cutter and holder. l

The bar 194 with the tooth 196 for latching the cutter and with the slot 195 receiving the stud 212 for unlatching purposes, may be described las a toothed member which is movable in one pair of directions, downwardly and upwardly in Fig. 2, for latching and unlatching the cutter, and movable in another pair of directions, to the right and left in Fig. 2, for reengaging and restoring the cutter in latched position. l

There has thus been described a weltv sewing machine embodying the features and attainino` the advantages of the present invention. ince many matters of combination, arrangement, operation, lstructure and detail may be variously modified without departing from the principles, it is not intended to limit the invention to such matters except so far as set forth in the appended claims.

What is claimed is:

1. In a sewing machine a thread cutter and a thread holder, means for latching them in set position, spring means for operating them when unlatched, and a shiftable member engageable by the pulled-out thread between the stitching point and work adapted to be shifted by the pressure'of the thread for unlatching the latch means to effect the cutting and holding of the thread. Y

2. In a sewing machine a thread cutter and a thread holder, means for latching them in set position, spring means for operating them when unlatched, and an unlatching member adapted to be shifted at will for unlatching` the latch means to effect the cutting and holding of the thread. f

3. In a sewing machine a thread cutter, means for latching the cutter in set position, spring means for operating it when 4unlatched, and a shiftable unlatching member engageable by the pulled-out thread between the stitching point and work, the cutter being in line between the stitching point and unlatching member, whereby the thread may be engaged in the cutter and pressed againstthe unlatching member to cause the actuation of the cutter. l

4. In a sewing machine a thread cutter comprising Xed and movable blades, and a thread holder comprising fixed and movable parts, means for latching the cutter and holder in open position, spring means for closing them when unlatched, and a release means engageable by the pulled-out thread between the stitching point and work adapted to be shifted by the pressure of the thread for unlatching the latch means to eect the cutting and holding of the thread between the release means and stitching point.

5. In a sewing machine a thread cutter comprising. a movable blade, means for latching the blade in open position, spring means able release member engageable by the pulledout thread between the stitching point and work adapted to be, shifted by the pressure of the thread for unlatching the latch means thereby to effect the cutting of the threads be- {,)ween the stitching point and release memer. i

6. The combination as in claim 5 and wherein the release member has a notch to receive the thread, so positioned that when the thread is engaged in the notch it also engages in the cutter. Y

7 The combination as in yclaim 5 and wherein is an automatic means operable from another part of the machine for opening and latching ythe cutter.

8. The combination as in claim 5 and wherein is a power operated connection for reopening and latching the cutter.

9. In a sewing machine a spring-actuated thread cutter, a toothed member movable in one pair of directions to latch and unlatch the cutter and movable in another pair of directions to reengage and restore the cutter in latched position, means engageable by the pulled-out thread between the stitching point and work adapted to be shifted by the pressure of the thread for moving the toothed member to unlatchy the cutter, and means for moving the toothed member to reengage and restore the cutter in latched position.

10. In a powerdriven welt sewing machine, welt severing and gripping mechanism operating beyond the stitching point and having means for operating it at will after the stoppage of the machine, a thread cutter and a thread holder, means for latching them in set position, spring means for operating them when unlatched, a shiftable member operable at will for shifting the latch means to effect the cutting and holding of the thread, and a connection from the operating means of the welt severing and gripping mechanism for resetting `the thread cutter and holder in latched position.

11. In a power driven welt sewing machine, welt severing mechanism operating beyond the stitching point and having means for operating it after the stoppage of the machine, a thread cutter, means for latching it in set ositionk s rin@ means for o erating it when 7 b D unlatched, a shiftable member operable at will for shifting the latch means to cause the cutting ofthe thread, and a connection from the welt severing mechanism operable by the welt severing action thereof for resetting the thread cutter in latched position.

In testimony whereof, this specification has been duly signed by:

AXEL FOLKE CARLSON.

for operating it when unlatched, and a shift- Y

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