US2328070A

US2328070A - Shoe sewing machine

Info

Publication number: US2328070A
Application number: US415571A
Authority: US
Inventors: Otto R Haas
Original assignee: United Shoe Machinery Corp
Current assignee: United Shoe Machinery Corp
Priority date: 1941-10-18
Filing date: 1941-10-18
Publication date: 1943-08-31
Anticipated expiration: 1960-08-31

Description

Aug. 31, 1943. o. R. HAAS SHO-E SEWING MACHINE Filed Oct. 18, 1941 2 Sheets-Sheet l Aug. 31, 1943. r R H S 2,328,070

SHOE SEWING MACHINE Filed Oct. 18, 1941 2 Sheets-Sheet 2 Wit/06.53 I I fivanfon v 3 Patented Angel, 1943 2,328,070 snoEsEwrNG MACHINE Otto R. Haas, North Beverly, Mass., assignor to United Shoe Machinery Corporation, Flemington, N. J., a corporation of New Jersey pplication October is, 1941, SerialNo. 415,571

' SCIaiins. c1. 112-61) a The present invention relates to shoe outsole sewing machines, and more particularly to improvementshin mechanisms for actuating the presserfoot of an outsole stitcherof the type disclosed in U: S. Letters; Patent to French and Meyer No. 473,870 of April 26, 1892, and in pres ent inventors application for patent Serial 'No. 294,926, filed September 14, 1939. 1

For actuating the presser foot in the machine of thepatentand application above identified, the presser foot is secured to a lever having a ratchet on one-arm arranged to be engaged by apawl forlockingthe presser foot against the work: I Forclamping the *work before'a stitch is inserted'duringeach sewing cycle, a second relatively movable arm having a ratchetisvyiel'd ingly connected with the presser foot lever and arranged to be engagedby a clamping pawl which is moved bodilywhile engaging: the clamping ratchet. Before each feeding movement of the work, thepresser foot is unlocked and the: clamp ing pressure re1ieved,.both'pawls being held dis engagedii'rom theirrespective ratchets during feed of the worktoupermit the presser foot. to accommodate itself with the thickness of the actuating the pawls towards andfrom engage ment with their respective ratchets and forsmoving a the clamping pawl bodily, there is" provided a single cam actuated lever on which theclamping pawl is mounted, aflxed pivot onthe machine frame for thelocking pawl, and a fixedstud work at the end of the feeding operation. For

ments. Furthermore, the location-of pfiwls and, the cam lever in the machine renders'them inaccessible for making accurate adjustments according to the usual expedientsafter the machinehas been assembled completely, due to: lack of space andobstructionby other operating-parts of the machine. v

The object of the present invention is t0 .im,

prove the construction and simplify the manner of assembly and :adjustment either when the machine is being manufactured or at anytime thereafter when changes in adjustment or tim ing-are desired. In accordance? with thisaob-j ject, theprincipal featurerelates to the use of a a cam lever having 'adjustablemeansfor changing the times-in eachsewing cycle in whicha presserrfoot lockingi'spawl and -a presser foo-t clamping pawliare actuated relatively to each other to lock the'presserfoct and to caus'ethe presser foot'to clamp "the work in a" shoe sewing machine of the typewreferredto:having avfixed pivot for the locking pawl and; a fixedstud against which the clampingpawl is "engaged to cause the pawls to bereleas'ed from their respec tiveiratchets at the: proper time's; This feature a of the invention also includes provision of'means for" changing the limitsof movementlimparted,

to-the clamping pawl by the cam 'leverwwithout changingzthe adjustmentof relative timingvbew onthe frame against which the clamping pawl is engaged duringmovement of the cam lever to release the clampingpawl front its ratchet,

thejparts being so located thatduring downward movement of the cam lever, the lever will actuate the locking ,pawl away from itsratchet at due as manufacturing inaccuracies or torequirementsmet .withspecial types of work, the actuation of the pawls towards: and from their ratch ets to cause thework to be clamped with a suitable pressure and released for feed does notoccur simultaneously orsuflicient movementis not imparted to one or both the ,pawls to accomplish the purposes intended, Numerous expedients have been adopted during manufacture of the machine, such as filing or bending the parts: in order to avoid these dimculties, but, where some change isnecess ary after the machine has been assembled, most expedients have been found to v haveundesirable results, such as increasing weake nessin the parts or insuffici'ent rangeof, adjust+ substantially the same time theclamping pawl is released-from its ratchet. In certain instances,

tween the pawls. In one form of the invention,

the cam lever has connected. withit-anarmon which :the clamping pawl "is ,adjustably mounted and a locking pawl releasing arm. pivotally mountedconcentrically to the pivotal mounting of the clamping pawllever, the locking pawl vreleasing-arm being adjustablv secured tothe claming pawl arm. In the preferred form; of they invention, the'fulcrum cfthe cam lever is ad justableto change the positions; of:the clamping pawl and releasing pawl arm simultaneously.

These and other features .of the invention, to-

gether with the construction, arrangements and combinations. of parts hereinafter described and claimed, and the advantagesto be obtained thereby, will readilybe understood by those skilled in the, art from the following description, taken in connectionwith the accompanying drawings, in which Fig.1 is ,a sectionalyiew of a portion of an outsole shoe sewing machine embodying the invention, parts having been broken \away and removed to illustrate more fully the construction; Fig, 2-.is:a,view;on-an enlarged scalecf a cam actuated lever, pawls and ratchets for the presser foot mechanism of the machinefillustre infi F a. P v ew q th a downwardly.

actuated lever and clamping pawl supporting arm of Fig. 2; Fig. 4 is a side view of a cam actuated lever and pawl supporting arm in the I preferred formof the present invention; and

Fig. 5 is a sectional plan view of the cam lever and clamping pawl supporting arm of Fig. 45.

The illustrated machine is an outsole stitcher of the same general construction and mode of operation, except as hereinafter described, as that disclosed in the patent and application above refe'rredto, and is provided with a curved hook needle, a curved awl 2, and other stitch forming devices more fully disclosed in the patent and application. To hold the work in position against the thrust of the awl duringsewing operations of the machine, the machine is provided with a work support 4 and a presser foot 6 actuated by which the machine originally was adjusted to I operate is changed. To make these adjustments,

suitably shaped cams on a sewing *shaft 8 in timed relation with the stitch forming devices to clamp and release the work.

As in the machine of the patent and application, there is fulcrumed on a stud l0 secured in the main frame, indicated at 12, at the rear of the machine, a cam actuated lever l4 having a roll I 5 engaging a cam on the sewing shaft.lPivotally mounted at the forward 'endof the lever I4 is a presser foot clamping pawl |6, arranged to engage a ratchet I8 secured to the free end of a clamping arm loosely'supported ona shaft 22 in the forward portion of the machine frame. After engagement with the ratchet l8, the'pawl moves bodily with the leve'r' M to clamp th work. Alsoloose on the shaft 22 is mounted a presser is moved downwardly by its cam, a projecting portion of the lever engages an arm on the pawl 28. and causes the pawl 28 to'be disengaged from the ratchet 26. At the same time, a stud as at 34, fixed in'the frame I2, is engaged by a'shoulder on; the pawl l6, causing the'pawl IE to be disengaged from'the ratchet [8. 'To hold the resser foot with a light yielding pressure against the surface of the work when the pawls are released,

atwhich time the feed takes place,- the rearward end of the presser foot lever 24is'pr'essed upwardly by a light spring 35- acting on a link 36 connected to the lever 24.- As thelever I4 is moved upwardly, aspiring-pressed plunger 31 engaging a second shoulder on the pawl l6 ,causes it to be re-engaged with the ratchet l8. the 1 same time, the lever l4 allows the locking-pawl 2 8 to re-engage the ratchet 2 61;" v

After the clamping p'awllG engages the ratchet l8, further upward movement of the lever l4 exerts a" yielding force through a spring 38 coiled about a link 40 slidable in a lug on the clamping arm 20 and pivotally'connected to the rearward end of the presser foot lever 24,'caus'ing acl'amp ing pressure of the presser foo t'to be exerted against the work on the work support. The pressure thus exerted on the work by the-presser foot is thereafter maintained throughout a substantial portion of each sewing cycle by the looking ratchet and pawl, and-is released only after the presser foot actuating lever is moved again In the machine of the; patent and application,

from the ratchet l8 in each sewing cycle.

sure toflbe exerted on the work. Later disen-' the machine iseither partially dismantled and the parts filed or an attempt is made to bend the parts or to make suitable adjustments otherwise without removing the parts from the machine. adjustment of the presser foot actuating mechanism without removing the parts from the machine is by bending theistud 34 in the proper direction to cause the clamping pawl it to disengage its ratchet l8 earlier .or later than the movement of the lever l4 with respect to actua- Bending thestud tion of the locking paw1 ,28. 3 necessitates further adjustments in the time of operation of the locking pawl,; and these changes in turn require further changes in the range of movement imparted by the cam to the lever I4, Frequent bending of the stud 34 results in breakage so that in any case it is. necessary to dismantle the machine eventually for'replacement of the stud 34. To facilitate adjustments, a stud similar to that indicated at 42 on which the cam, roll I5 is mounted is? sometimes made with an eccentric portion, so that the position of the roll may be changed on; the lever butwith this eccentric portion, the stud is rela-. tively inaccessible in, the machine, it being reached for adjusting purposes only by, dismantling the machine, at least partially.

In order to avoid difliculties in adjusting the presser foot actuating mechanism both during factory assembly. and also during operation when difierent qualities and thicknesses of work are to be sewed, the lever M of the present machine has a separate clamping pawl supporting arm 44pivotally mounted on a bolt 46 secured in. the actuating lever l4. Thearm has a rearward extension through which passes a clamp bolt 38 engaging a slot in the actuating-lever I4 and is forked at its forward end to receive the clamping pawl l6 onahorizontal,pivotm). By. loosening the clampbolt 48, theposition of the arm 44 may be changed with respect to the lever l4, thu's causinglcontact of the, clamping pawl 16 with the stud 34 to disengage. the pawl sooner or later Early disengagement of the clamping pawl causes late engagement and relativelylight clamping presgag'ement' results in earlier engagement and relatively heavy pressure 'on the work.

To enable a corresponding adjustment to'be made in the locking pawl so that it will be operated'to' release the work as soon as the clampingpawl is disengaged/the. projection for releasing the locking pawl 28 is formed on a second arm 52; The locking pawl releasing arm 52 is also pivotally mounted on the bolt 46 and has a rearward extension into which. is threaded a clamp bolt 54 passing through a slot formed; in

I the rearward end of the clamping pawl support- A common expedient for changing the cam lever 56.

, operation of the machine.

"claimed is:

9 2,328,070 the distance between the forward end of the clamping pawl releasing arm 52 and the clamp-.

ing pawl supporting .arm:44 may be set suitably to correspond to-rthe relative distance between the fixed stud 34 and the fixed pivot 30 on which the locking pawl is mounted. .With the arm M so setand the bolt 54 tightened, the pawls are actuated simultaneously towards and from their ratchets. If any adjustment is desired thereafter to enable the machine to operatesuccessfully on heavier or lighter work or to causethe presser foot to exerta greater or less clamping force on' the work, the clamp bolt- 48 for the clamping x pawl releasing arm 44 maybe loosenedto admit change in 1 theposition ofthe arm on the lever l4. With changes in position of the arm 44, no

, change occurs between thelocking pawl releasing arm and the arm which is clamped thereto, so'that changes for variations in work thicknesses may be made independently of changes in relative times at which the locking and clamping pawls areieleased from their respective ratchets.

In a preferred form of the invention,eccentric adjusting devices for the clamping and. locking pawls are provided, as illustrated in Figs. 4 and 5, The cam lever of this form of the invention is indicated at 5B, fulcrumed onthe stud l0 and arranged at its forward end to support the clamping pawl l6 instead of employing a separate arm, and the spring-pressedplunger 31 is mounted in the lever as in the patent andapplication. To provide means for adjusting the relative times of operation for the clamping pawl I6 and the locking pawl 28, a slot-endedarm,

58 is rotatably supported by the lever56 at its slotted end on a bolt and is formed at its other end with a" lateral locking pawl releasing projection 62 underlying the forward end. of the To hold the arm 58 in adjusted position, that end of the arm near the projection 62 is perforated to receive an eccentricsleeve 64 having a hexagonal collar. To support" the sleeve, a bolt 66 is threaded into an opening in the le ver 56, the

bolts

60 and 66; when tightened, securing the arm 58 rigidly with the lever 56.

To regulate the limits of movement imparted l by the cam lever to the clamping and locking pawls, the stud ID is surrounded by an eccentric flanged s1eeve68 clamped withinthe split hub :of thercam lever 56 by a, drawbolt I0. spanner holes 12 are provided in the flange of Suitable presserfoot and mechanism for actuating the presser foot toclamp and release the'work com-.-

prising "a lever having a locking ratchet, a looking pawlfor engaging the ratchet; a clamping arm having a ratchet connected to the presser foot, a clamping pawl forengaging the ratchet upon the clamping arm, a fixed pivot for the locking pawl, a. fixed stud against which the clamping pawl is engaged to release said clamping pawl from its ratchet, a cam lever for caus-' ing both pawls to be actuated towards andfrom their respective ratchets and for'moving the clamping pawl bodily to force the presser foot against the work, and adjustable means connected to said lever for changing the times in each sewing cycle at which the pawls are actu: ated relatively to each other.

2. A shoe sewing machine having, in combination, stitch forming devices, a work support, a

presserfoot and mechanism for actuatingthe presser foot to clamp and release the'work comprising a lever having a locking ratchet, a locking pawl for engaging the ratchet, a clamping the sleeve to enable the sleeve to be rotated easily. The eccentric adjusting devices enable the operator to regulate the. presser foot operating mechanism more satisfactorily in certain respects than in the previously described embodiment of the invention, particularly where adjustments are made with work in the machine or with the springs for actuating the presser foot invention, what is l. A shoe sewing machine having, in combinatio-n,istitch forming devices, a work support, a

arm having a ratchet connected to the presser foot, a clamping pawl for engaging theratchet upon the clamping arm, a fixed pivot for the locking pawl, a fixed stud against which "the clamping: pawl is engagedto release said clamp-' ing pawl from its ratchet, a cam lever for causing both pawls to be actuated towards and from their "respective ratchets and-for moving the clamping pawl bodily to force the presser foot against the work, and adjustable means connected to said lever for changing the times in each sewing" cycle at which the pawls are actuated relativelyio each other and for changing the limits of movement imparted to the clamping pawl by the earn lever without changing the adjustment of relative timing between the pawls. 3. Ashoe sewing machine having, in combi nation, stitch forming devices, a Work support, a presser foot and mechanism for "actuatingtlie presser'foot to clamp and release the work com-y prising a lever having a locking ratchet",a looking pawl for engaging-the ratchet, a clamping arm having a ratchet connected to the presser foot, a clamping pawl for 'engagingthe ratchet upon the clamping arm, a fixed pivot for the locki paw a fixed stud against which the clamping pawl is engaged to release said clamping;pawl from its ratchet, a cam lever for causing both pawls to be actuated towards and from their respective ratchets and for moving the clamping pawl bodily to force, the presser foot against the work, and an arm on which the clamping pawl is mounted adjustably connected to the cam lever to change the time in each sewing cycle at which the pawls are actuated relatively to each other.

4. A shoe sewing machine having, in combination, stitch forming devices, a work support,

a presser foot and mechanism for actuating the presser foot to clamp and release the work comprising a lever having a locking ratchet, a locking pawl for engaging the ratchet, a clamping arm having a ratchet connected to thejpresser foot, a clamping pawl for engaging the ratchet upon the clamping arm, a fixed pivot for the locking pawl, a fixed stud against which the clamping pawl is engaged to release said clamping pawl from its ratchet, a cam lever for causing both pawls to be actuated towards and from their respective ratchets and ,for moving the clamping pawl bodily to force'thepresser foot against the work, an arm on which the clamping pawl is mounted adjustably connected to the cam lever to change the time in each sewing cycleat which the pawls are actuated relatively toeach other, and a locking pawl releasing arm adjustably secureclto the arm on which the clamping pawl ismounted to enable the limits of movement imparted to the clamping pawl by the arm having a ratchet connected to the presser foot, a clamping pawl for engaging the ratchet upon the clamping arm, a fixed pivot for the locking pawl, a fixed stud against which the clamping pawl is engaged to releasesaid clamping pawl from its ratchet, a camleverv for causing both pawls to be actuated towards andfrom their respective ratchets and for moving the clamping pawl bodily to force the presser foot against the'work, an arm on which the clamping pawl is mounted adjustably connected to the cam lever to change the time in each sewing cycle at which the pawls are actuated, a locking pawl releasing arm pivotally mounted concentrically to the pivotal mounting of the clamping pawl arm, and means for adjustably securing the locking pawl releasing arm to the clamping pawl arm.

6. A shoe sewing machine'having, in combination, stitch forming devices, a work support, a presser foot and mechanism for actuating the presser foot to clamp and release theworkcomprising a lever having a locking ratchet, a lock: ingpawl for engaging the ratchet, a clamping arm having a ratchet connected to the presser foot, a clamping pawl for engaging the ratchet upon the clamping arm, a fixed pivot for the locking pawl, a fixed stud against which the clampingpawl is engaged to release said clamping pawl from its ratchet, a cam lever for causing both pawls to be actuated towards and from their respective ratchets and for moving the clamping pawl bodily to force the presser foot against the work, and adjustable means including an eccentric operatively connecting the lever and one of the pawls to enable the times in each sewing cycle at which the pawls are actuated to be changed relatively to each other.

7. A shoe sewing machinehaving, in combination, stitch forming devices, a :work support, a presser foot and mechanism for actuating the presser foot to clamp and release the work comprising a lever having a locking ratchet, a locking pawl for engaging the ratchet, a clamping arm having a ratchet connected to the presser foot, a clamping pawl for engaging the ratchet upon the clamping arm, a fixed pivot forthe locking pawl, a fixed stud against which the clamping pawl is engaged to release said clamping pawl from its ratchet, a cam lever for causing both pawls to be actuated towards and from their respective ratchets and for moving the clamping pawl bodily to force the presser foot against the work, andadjustable means including an arm arranged to cause the locking pawl to be disengaged from its ratchet and eccentric means operatively connecting the locking pawl releasing arm to the cam lever to enable the times in each sewing cycle at which the pawls are actuated relatively to each other to be changed.

8; A shoe sewing machine having, in combination, stitch forming devices, a'work support, a presser footand mechanism for actuating the presser foot to clamp and release thework comprising a lever having a locking ratchet, a looking pawl for engaging the ratchet, a clamping arm having a ratchet connected to the presser foot, a clamping pawlfor engaging the ratchet upon the clamping arm, a fixed pivot for the locking pawl, a fixed stud against which the clamping pawl is engaged to release said clamping pawl from its ratchet, a cam lever'for causing both pawls to be actuated towards and from their respective ratchets and for moving the clamping pawl bodily to force the presser foot against the work, adjustable meansincluding an arm arranged to cause the locking pawl to be OTTO ,R. nA s.