US592971A - Sewing-machine for lasting boots or shoes - Google Patents

Description

(No Model.) 5 SheetsSheet 1.

T. K. KEITH.

SEWING MACHINE FOR LASTING BOOTS 0R SHOES.

No. 592,971. Patented N0v.'2, 1897.

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T. K. KEITH. SEWING MACHINE FOR LASTING BOOTS 0R SHOES.

No 592,971. Patented Nov. 2, 1897.

(No Model.) 5 Sheets-Sheet a. T. K. KEITH. SEWING MACHINE FOR LASTING BOOTS 0R SHOES.

No. 592,971. Patented Nov. 2, 1897.

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. T. K. KEITH. SEWING MAOHINE FOR LASTING BOOTS 0R SHOES. No. 592,971. Patented Nov. 2,1897.

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' T. K. KEITH.

SEWING MACHINE FOR LASTING BOOTS OR SHOES.

No. 592,971. Patented Nov. 2,1897.

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UNITED STATES THOMAS K. KEITH, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE KEITH- PATENT @rrrcn.

LASTING MACHINE COMPANY, OF KITTERY, MAINE.

SEWlN G-MACHlNE FOR LASTING BOOTS OR SHOES.

SPECIFICATION forming part of Letters Patent No. 592,971, dated November 2, 1897.

Application filed June 8,1895. Serial No. 594,769. (No model.)

T at whom it may concern.-

Be it known that I, THOMAS K. KEITH, of Boston, county of Suifolk, State of Massachusetts, have invented an Improvement in Sewing- Machines for Simultaneously Lasting Boots or Shoes and Attaching \Velts, of which the following description, in connection with the accompanying drawings, is a specification,

like letters and figures on the drawings representing like parts.

This invention has for its object the production of a sewing-machine by which the operations of lasting a boot and shoe and attaching welt thereto may be done simultaneously. This work is now commonly done mechanically at difierent times on two Inachines.

In another application, Serial No. 594,768, filed June 8, 1896, I have shown a sewing-machine for lasting boots and shoes and herein I have combined with mechanism substantially such as shown in said application means for presenting and attaching a welt to the upper and inner sole, and I have also provided the machine with novel feed-actuating mechanism.

Figure 1, in front elevation, represents a sufficient portion of a sewing-machine with myimprovenients added to enable myinvention to be understood. Fig. 2 is a top or plan view thereof; Fig. 3, a left-hand side elevation; Fig. 4, a detail showing the lower end of the foot or rest which meets the sole or runs in the channel. Fig. 5 is a plan view with the cam-shaft and its cams and the nee die and awl actuating devices omitted, said view being made to show the looper and its line of motion. Fig. 6 is a view to the left of the dotted line to. Fig. 7 is a detail showing the awl-carrier and its awl, and Fig. 8 shows the welt-guide removed. I

The framework, composed of a plate A, havin g suitable uprights A A to sustain the main shaft A will in practice be mounted upon a suitable base or leg at the proper height from the floor.

The main shaft has, as herein shown, at its left-hand end a sprocket-wheel B, over which is extended a suitable sprocket or other chain B, which in turn passes about and drives a sprocket-wheel B fast on a shaft B, having an attached gear B which engages a second gear 13 on a shaft B having fixed bearings, the said shaft having at its inner end a bevel-gear B, meshing into a bevel-gear B feather-splined on a shaft 13 having bearings at B and 13 one of said bearings B being fixed to the framework, while the other of said bearings is fixed to a horizontally-slidin g carriage O, the splining of the said bevelgear on the said shaft enabling the shaft to be rotated notwithstanding the sliding mo tion given to the carriage.

The shaft 13 has at its front end a bevelgear 0, which engages a bevel-gear C attached to or forming part of a moving and rubbing lasting-surface C herein shown as a rotating wheel mounted on a headed stud O and having its threaded end screwed into the bearing 13.

The carriage G has a series of ratchet-teeth G which teeth are engaged at intervals bya locking pawl or device (3, having its pivot at O and acted upon at proper times by a projection a (see Fig. 2) of the cam-hub C the upper end of said pawl being provided with a roller or other stud and being kept pressed toward the said cam by means of a spring 0 The carriage C has at its under side a projection 0, against which acts an expansionspring 0 suitably held in the plate A, said spring normally acting to keep the rubbing or stretching surface (3 out against the side of the upper on the side of the last, the carriage being free at times to be pushed in by the action of the upper and the last in the hand of the operator against it, the operator putting the side of the upper on the last against the rubbing-surface and pushing it and the carriage back until the channel part of the sole is in position with relation to the needle and awl, to be described, to enable said needle and awl to enter the channel, and then he starts the machine, and just before the awl gets into position to enter the work the cam c retires from contact with the pawl or locking device, letting its end engage the ratchet-teeth to lock the carriage and hold it locked during the formation of the stitch, and during the feeding operation the carriage is unlocked in order that the rubbingsurfaee may adapt itself to the contour of the last preparatory to the making of each stitch.

The rubbing-surface described constitutes a lasting mechanism or device, and it is substantially such as described in my application, Serial No. 594,768, filed the 8th day of June, 1896.

The main shaft has a cam-hub D, the inner face of which is provided with a cam-groove D, (shown by dotted lines, Fig. 3,) which groove receives a roller or other stud D of an arm D fast on a short shaft D having its hearings in the fixed standard A said shaft having connected to it an arm D which by link I) is joined to the upper end of the nee dle carrying block D, said block being mounted on a hollow stud extended through the standard A and held in position by a setnut b, the said block having attached to it a hooked needle 6 The hollow stud referred to receives a shaft 17*, provided at its inner end with a needlesteadying device or guide b having an eye through which the needle works, said shaft having at its outer end an arm b having at flashed to it a spring b normally acting to keep the needle-steadying device pressed toward the work, its movement in that direction being, however, arrested by the little projection F (see Fig. 4) on the foot or channel guide F, the said steadying device being, however, lifted about as the needle is withdrawn from the work by contact with the clamping-plate 17 connected to the needleblock. (See Fig. 6.) I

The main shaft has a cam-hub E, provided at its left-hand face with a suitable camgroove, (not shown,) in which enters a roller 01' other stud E of an arm E fast on a short shaft E having its bearings in a standard A pivoted on; a stud A, located near the rear side of the machine at a point behind the vertical plane occupied by the main shaft, the said short shaft E having fixed to its opposite end an arm E which by a link 6 is joined to the upper end of the awl-segment E (shown separately in Fig. 7,) and provided with an awl e. The awl-segmentis mounted on a stud 6 having its hearings in said standard A so that the stud and the short shaft referred to may be moved, together with the said standard, when the awl is in the work, the standard at such time having imparted to it a swinging movement to effect the feeding of the work. The use of this swinging standard, pivoted at the rear side of the machine, enables thelongitudinal sliding carriage usually employed to hold the stud on which the awl-segment turns to be dispensed with and enables the sewing parts to be brought together more compactly, and at the same time affords a proper space below the center of motion of the needle and awl in which may be presented the shoe, held in the hand of the operator, so that the said stretching de vice may act against the upper on the side of g the last and stretch the same preparatory to the needle entering the" sole, upper, and welt to unite the same together.

In this machine the awl enters first the welt and then the upper and between substance,

; said awl emerging from the latter in the bottom of the channel cut in the face of the inner sole, if such channel be used.

The moving of the swinging frame carrying the awl is effected as follows, viz: The

said frame has, as herein shown, attached to it a block E having a seat in which enters the ball-like end ll of the link E the said link being shown as made in two parts in order that it may be adjusted as to its length and being attached in an adjustable manner by a stud E in a slot at the upper end of an arm E having its fulcrum at E the said arm having a roller or other stud, as E, which enters a cam-groove in the periphery of a cam-hub E fast on the said shaft.

Attached tothe fixed frame A. is a foot or channel gage F, its lower end being bent, substantially as shown in Fig. 4, so as to enter the channel in the inner sole and position the shoe both vertically and horizontally with relation to the path of the awl in order that the stitch may be taken therein at the proper depth and place, and this gage has preferably at one side a projection F, against which, as

stated, the needle-steadying device acts when This foot or channel gage is adj ustably attached by bolts 20 to the frame A and it may be adjusted into proper in its lowest position.

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The stud 8 about which the awl-carrier works, also serves to support a welt-guide G,

(shown in Fig. 6,) the said welt-guide being attached to an arm 30, provided at one end with a hole which fits over the said stud, on which it is free to turn somewhat as it is acted upon by the shoe as the latter is being put into position to receive the stitch, the upper edge of said arm 30 having a cam-surface 31, which is acted upon by the free outer end of a lever G, said lever when its acting end is in its lower position meeting a groove 32 and looking the welt-guide in position, this being just previous to the entrance of the awl into the welt and upper to feed the same, said weltguide acting not only to present the welt in correct position, but also to push the welt and upper closely down upon the outer portion or edge of the inner sole, and its move ment is in such direction as to take up any slack that may have been put into the upper above the top of the last or the inner sole thereon by the continued rotation of the rubbing-surface, the said lever when it arrives at said shoulder locking the "welt-guide temporarily in position, the pressure of the weltguide on the work being resisted by the foot in the channel in the face of the sole, the guide and the foot clamping and holding the sole and upper closely together while the needle enters the same to make astitch. The lever G is pivoted at G and its inner end is so located as to be struck by the projection E of the cam E to lift the lever and release the welt-guide, a spring G connected to said lever, serving the purpose of keeping its inner end normally pressed toward the said cam.

The looper cl, to furnish thread to the needie, is attached to an arm 61, slotted at its outer end to receive a guide-screw d secured to a lever d said arm (1 having a notch d in its side and being connected by a similar slot and stud cZ at its other end to the under side of said lever C1 The lever d is pivoted at d in the forked end of a rock-shaft d, having attached to its outer or left-hand end an arm al to which is connecteda spring (i attached to the framework, the spring normally turning the rock-shaft in a direction to keep the outer end of the lever 61 and the attached thread-guide down in its lower position. The inner end of the lever 01 has a roller or other stud d", which enters the cam-groove 61 in a cam-hub 0 attached to the main shaft. The notch d in the side of the arm cl is entered by the rounded end of arm f, connected to a rock-shaftf having at its right-hand end an arm f provided with a stud which enters a slot at the lower end of a lever f pivoted on a stud f of an upright f, said lever having at its upper end a roller or other stud f which is acted upon by a cam f fast to the right-hand side of the cam-hub E. A suitable spring f", connected to the said lever and the framework, acts to keep the said lever against the said cam f so that the rock-shaft f 2 is moved positively. The arm f, engaging the notch in the arm (1, moves the looper longitudinally on the lever (i and the said looper has movements imparted to it about the pivot (1 and the roller d is also rocked with the rock-shaft, so that the looper has given to it a compound circular movement and a backward and forward movement, (indicated by the dotted lines in Fig. 5.) The rocking movement of the lever (Z about the pivot d is imparted by the cam projections (Z (Z of the cam (J acting upon the roll 03 on the rear end of the lever (1 the combined longitudinal sliding movement and the vertical and horizontal rocking movements of said lever 61 causing the thread carried by the looper d to be looped about the needle at the proper time.

lhe cam-hub D has attached to it at one side a cam m, which in the rotation of the main shaft acts on a roller or other studm, carried by an arm m fixed to a rock-shaft hi having its bearings in the fixed frame A the said rock shaft having a second arm m provided at its lower end with a threadsheave m about which the thread going to the looper and needle is wound, the said thread being passed through the hole n in the lever 61 (See Fig. 5.)

The thread coming from the wax-pot or other usual source of supply (not shown) is passed around the tension-wheel m and then under and about a sheave m", and thence about the sheave m, as stated, and led to the looper. The tension-wheel at has fixed to or forming part of it a ratchet-wheel m which is acted upon by a spring-pressed pawl m the pawl holding the ratchet-wheel and tension device locked, but at each inward movement of the lever m in the direction of the arrow the lower end of the said lever meets one end of the said pawl and releases the pawl to allow the tension device to turn.

The cam in will be of such suitable shape as to move the take-up in such time and order as to give up thread to the needle while the latter is drawing the loop through the material and to lock it before the completion of the stitch at the outward movement of the thread in order that the needle-thread may be drawn in to complete the last or previous stitch made.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1.. In a sewing-machine for lasting boots and shoes, the following instrumentalities, viz: stitch-forming mechanism, including a hooked needle and a looper, a segment, a curved awl attached thereto, a pivoted horizontal swinging standard having a stud to serve as a center of motion of said awl-segment, a shaft having its hearings in said swinging frame, connections between it and said awl-segment, a cam and means intermediate it and said shaft to rock the latter, means to swing the said frame while the and is in the material, and a continuously-rotat ing rubbing-surface to act on the upper at the side of the last and stretch and feed the same to the last both preparatory to and during the stitching and feeding operation and a guide to present a welt to the upper, that it may be stitched thereto and to the sole, substantially as described.

2. In a machine of the class described, the combination with a hooked needle,of a looper, a lever to which it is attached, a second lever pivotally mounted on a rock-shaft, means to I oscillate said rock-shaft and means to vibrate said lever on its pivot on said rock-shaft, and means to slide the lever to which the looper is attached on the said second lever, whereby the looper is given an irregular movement in presenting its thread to the needle, substantially as described.

3. In a machine of the class described, a hooked needle, means to operate it, a channel guide and foot having at one side a projection, combined with a needle-steadying device and a spring to move it, the said projection determining the descent of the said needle-steadying device, substantially as described.

4:. In a sewing-machine for lasting boots and shoes, an awl-segment provided with an awl, a pivoted horizontally-swinging standard, a stud mounted in said standard and serving as the center of motion for said and- IIO segment, a short shaft also mounted in said standard, means between said short shaft and said segment to operate the same, a cam and devices actuated thereby to rock said short shaft, and devices connected to said standard to vibrate the same about its pivot, while the awl isin the work, substantially as described.

5. In a machine for lasting boots and shoes, a circularly-movable curved hooked needle, of means'to actuate it, a constantly-rotating rubbing device to act against and stretch the upper over the side of the last, and a weltguide carrier comprising an arm mounted to turn about the axis of motion of the said needle, said arm being provided between the

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