US243945A - Sewing-machine - Google Patents

Description

(Mode1.) 4 Sheets-Sheet l.

E. W. MULL'IKINT8Z; H. G. HARTLEY.

SEWING MACHINE.

No. 243,945. Patented July 5,1881.

' N NTQ zfimww.

gin].

(Model.) 4 SheetsSheet 2.

E. W. MULLIKIN & H; C. HARTLEY.

SEWING MACHINE.

Patented July 5, 1881.

Lilhognpher. Wan

(M0del.) 4 Sheets-Sheet 3. E. W. MULLIKINKE'H. Oi HARTLEY.

SEWING MACHINE.

. N0. 243,945. Patented July 5,1881. I

WITNE5E5 N NT HE mmwwgfi w nib ump, g.

N. PEYERS. Pholo-Llmrlplwr. Wllh llgtnn, D. C.

(ModeL) 4 Sheets-Sheet 4.

E. W. MULLIKIN & H. 0. HARTLEY. SEWING MACHINE.

'No.-243,945'. Patented July 5,1881.

, limit of its motion in one direction.

UNITED Y STATES PATENT OFFICE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 243,945, dated July 5, 1881.

Application filed September 15, 1880. (ModeL) Patented in Germany July 10, 1880.

To all whom it may concern:

Beit known that we, EDWARD W. MULLIKIN and HENRY O. HARTLEY, of Springfield, in the county of Clarke, and in the State of Ohio, have invented certain new and useful Improvements in Sewing-Machines; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l is a perspective view of our machine, the side wall of the stationary arm being removed to show the interior construction of parts. Fig. 2 is a like view of the lower side of said machine, the shuttle-lever being at the Fig. 3 is a plan view of the same, said shuttle-lever being shown by the full lines at the opposite limit of motion. Figs. 4 and 5 are sections of the front end of the base-plate, upon line 00 w of Fig. 2, and show, in elevation, the mechanism employed for moving vertically and laterally the feed-bar. Figs. 6 and 7 are cross-sections nponlines a w and 00 :0 respectively, of Figs. at and 5. Fig. 8 is a perspective view of the plunger and its housing, used for moving the feed-bar vertically, said parts being separated from each other. Fig. 9 is an elevation of the front side of the fixed portion of the head of the stationary arm, and shows the mechanism employed for locking the take-up in an elevated position. Fig. 10 is a vertical central section of the same and of the detachable portion of said head upon a line with said stationary arm; and-Figs. 11 and 12 are enlarged perspective views-of said head from the front, a portion of the detachable portion being removed in each view to show the means employed for raising the presser-bar.

Letters of like name and kind referv to likezontal movement of the latter, substantially as and for the purpose hereinafter set forth.

. It consists, further, in the means employed for locking the take-up in an elevated position,

EDWVARD W. MULLIKIN AND HENRY O. HARTLEY, OF SPRINGFIELD, OHIO.

substantially as and for the purposehereinafter specified.

It consists, further, in a cam for raising a presser-bar adapted to lock the latter in position at two points between its limits of motion, substantially as and for the purpose hereinafter shown.

In consists,finally,in a presser-bar provided with an arm which, extends laterally to and engages with a lifting and locking device arranged upon or within the opposite side of the head, substantially as and for the purpose here- I inafter set forth.

In the annexed drawings, A represents the base-plate of our machine, from one end of which a hollow arm, B, extends upward to a suitable height, and thence horizontally and centrally to a point near. the opposite end of said plate. The front end of the stationary arm B is provided with a rectangular plate,B,

which forms one side of a head for containing a needle-bar, O, and presser-bar D, the front side and edges of which head are formed by a cap, B that fits over the edges of said plate B, and is secured thereto by means of screws. Extending through the horizontal portion of the arm B, and journaled in bearings at each end of the same, is a shaft, E, which, at its rear end, is provided with a driving-pulley, F, and balance-wheel F, while upon the front end of said shaft is secured a cam, G, that hasprojecting from its' face a crank-pin, g, which engages with a horizontally-slotted yoke, O, that is secured to the needle-bar G, the arrangement being such as to cause said needlebar to be reciprocated in a vertical line by'the rotation of said shaft. The needle-bar Ooccupies a central position within the head B while the presser-bar D is arranged midway between the former and the side of said head farthest from the operator, and is provided with an arm, d, that passes horizontally around said needlebar and projects outward through a vertical slot, 1), which is formedin the side of said head nearest to the operator, and furnishes means whereby said presser-bar may be raised.

Pivoted upon the side of the head 13, im-- mediately below the slot 1), is a cam-plate, H, which has the form shown in Figs. 11 and 12, and has its upper edge in engagement with the projecting end of the arm (1. The upper edge of the plate H is provided with two curved elevations, h and h, each of which may be caused to pass beneath and raise the arm (1 by turning said plate upon its pivotal bearing, the movement of said plate being limited by a shoulder at the highest point of each elevation. One of said elevations, h, has such height as to cause it to raise said arm d and the presser-bar D sufficiently to just remove the presserfoot D from contact with the feed-bar, while the opposite elevation, h, raises said presserbar to the highest point necessary for the proper operation of the machine.

The arrangement of parts described is of material benefit, as it enables the presser-foot to be removed from injurious contact with the feed-bar without causing such elevation of said presser-foot as to interfere with the insertion, removal, or threading of the needle.

The location of the cam-plate II directly in front of the operator is of material advantage, as it enables said operator to readily observe the position of said plate, and to know in which direction it mustbe turned in order to raise the presser-foot to the desired elevation; in addition to which advantage said cam-plate occupies a most convenient position for manipulation without interference with other parts of the machine.

J ournaled within the vertical portion of the stationary arm B, at the front side, below the shaft E, is a shaft, I, which at its upper end is provided with a bifurcated arm, I, that extends horizontally rearward and thence upward, and embraces an eccentric, K, that is secured upon and revolves with said shaft E, the arrangement being such as to cause said shaft 1 to oscillate within its bearings as said shaft E revolves. The lower end of the shaft I extends below the base-plate A, and has secured thereon one end of a lever, L, which lever extends forward, and upon its opposite end has attached a shuttle-carrier, L, that receives a shuttle, L and is located within a shuttlerace, M, which is formed upon said base-plate, said race being formed upon a circular line of which said shaft I is the center. As thus arranged, it will be seen that at each revolution of the shaft E the needle-bar 0 will be moved vertically to the limits of its motion, and the shuttle L will be moved horizontally beneath the needle 0, so that by properly timing the relative movements of said parts they will coact and perform their share of the operation of sewing.

Secured upon the shaft I, below the shuttlelever L, is an arm, N, which extends horizontally forward about one and one-half inch, and has pivoted to its front end one end of a flat bar orlever, O, that from thence extends forward beneath and slightly beyond the shuttle-race M, and near its longitudinal center passes through a grooved block, P, which is pivoted within a bar, 1?. The front end of the lever O is contained within ahorizontal groove, q, provided in the rear face of a block, Q, that is secured to or upon the lower face of the baseplate A in front of the shuttle-race M, the arrangement being such as to permit the end of said bar 0 to move freely within said groove as its rear end is vibrated horizontally by the arm N. j

A flat feed-bar, It, having in side elevation the form shown by dotted lines in Figs. 4 and 5, is placed edgewise between the shuttle-race M and the block Q, with its ends contained within correspondingly-grooved lugs a, attached to the base-plate A, the arrangement being such as to permit said bar to move longitudinally within certain limits, while one of its ends is also free to have a slight vertical movement.

Upon the upper edge of the feed-bar R is provided the usual serrated dog, which projects through an opening in the cloth-plate, while from the lower edge of said bar two lugs, 1", project downward, one upon each side of the lever O, and at a distance apart about equal to twice the width of the latter.

The bar P has an L shape in plan view, and is arranged to be moved lengthwise of the base-plate foo the purpose of varying the position of the pivotal block P with relation to the longitudinal center of the feed-lever 0, a I

forward movement of said pivotal block operating to lessen the amount of lateral motion of the front end of said lever, while a rearward adjustment of said block will increase the motion of said lever at the point named. As the front end of the feed-lever 0 moves laterally it engages with the lugs r of the feed-bar R, and imparts to the latter a like motion, the

degree of which is governed by the position of the pivotal block I as before described.

The vertical movement of the feed-bar R is effected by the following-described mechanism: From the groove q of the block Q, a cylindrical opening, q, extends to the upper side of said block, and at its rear side is provided with a narrow vertical slot, (1 which at its lower end expands laterally and has a semicylindrical form, as shown in Figs. 4, 5, and 8. Within the opening q is loosely fitted a correspondinglyshaped block, S, which, near its upper end, is provided with a stud, s, that extends horizontally rearward through and be yond the narrow portion of the slot 1 while from a point near the lower end of said block a second stud, 8, extends rearward to or near the rear face of the block or housing Q, and furnishes a bearing for a roller, T. The face of said block S, at the inner end of said stud s, is'recessed, as seen in Fig. 8, so as to furnish space for the inner end of said roller. The rear end of the stud 8 passes into a horizontal slot, r that is provided in the feed-bar R, the relative positions of said stud and slot being such that when said feed-bar R is at its lowest point said block Swill beat the lower limit of its motion. The front end of the feed-lever O is provided with a laterally-projecting lug, 0, which, as seen in Figs. 4 and 5, has an outward and downward slope at its upper side, and which, as said lever moves horizontally in one direction, passes beneath the roller T and raises the same, the block S,and the feed-bar R, and upon the return movement of said lever passes from beneath said roller and permits saidparts to drop downward to their normal positions.

From the construction described it will be seen that as the front end of the feed-lever 0 moves toward the rear side of the machine it first raises the feed-bar R- by passing beneath the roller T, and then, engaging with the rear lug, 1*, moves said feed-bar in the same direction, while upon the return movement of said lever said feed-bar is first dropped to its lowest position and then moved toward the front side of the machine.

The weight of the feed-bar R and the block S will ordinarily be sufficient to cause them to drop to their lowest position when permitted to do the same by the withdrawal of the wedge-shaped lug 0 from beneath the rollerT; but in order that such downward movement may be rendered certain, we place a spiral spring, 8 between the-upper end of the block S and the base-plate A, which spring has sufficient expansive strength to accomplish the desired objectwithout causing undue friction.

The thread-controller or take-up consists of 'a lever, U, which is pivoted at one end within a lug, b, that is provided at the upper side,

just in rear of the plate B, from which lug said lever extends forward through a vertical slot, 11 in said plate, a similar slot, b in the head 13*, and through a like slot, 0, in the needle-bar O, and upon or within its projecting end is provided with a slotted opening, a, for the reception of the thread.

Within a suitable recess in the lug b, in front of the pivotal bearing of the take-up U, is a cylindrical pin or block, V, which rests upon the periphery of the cam G and is moved vertically by the rotation of the latter. The upper end of said pin bears against the lower edge of said take-up, and when moved upward carries the outer end of the latter upward to its highest position, as shown by the dotted lines of Fig. 10, and when occupying the lowest position permitted by said cam permits said take-up to be moved by the needle-bar G downward to the position shown by the full lines of said figure. the lower edge of the take-up U, engages with the upper end of the pin V when said parts are at their highest point, and assists in maintaining such position until the descent of the needle-bar O forces said take-up downward; but in order that the latter may be locked in said elevated position during the time desired a cylindrical plunger, NV, is arranged within a lateral opening in the arm B, and by means of a spring, 20, applied to its outer end, is caused at its inner end to bearagainstthe side of said pin. The lower portion of the pin V is re- A notch, a, formed in duced in diameter, so as to form a shoulder, a, which engages with the end of the plunger W when said pin is at its highest point, and locks thelatterin such position until the downward movement of the needle-bar 0 causes sufficient force to be exerted upon the take-up U to force said plunger outward.

By means of the mechanism described the take-up G has a period of rest at each limit of its motion, and enables a firm perfect stitch to be produced while at its upper rest, and furnishes sufficient slack to the thread at its lower rest to permit the shuttle to move freely through the loop.

. Having thus fully set forth the nature and merits of our invention, what we claim as new 1s 1. In combination with the feed-bar R, provided with the lugs r and slot 1, the block S, having the studs 8 and s and arranged within the housing Q q q, the roller T, and the feed-lever 0, provided at its front end with an inclined lug, 0, and adapted to vibrate horizontally upon an axial bearing, substantially as and for the purpose shown.

2. The combination of the horizontal drivingshaft E, having the eccentric K, the vertical shaft 1, provided with a radial arm, I, which embraces said eccentric, the arm N, the feed-lever 0, having the lip 0, the pivotal bearingblock P, the housing Q q q, the block S, provided with the pins 8 and s, the roller T,

' and the feed-bar R, having the slot r and lugs r, substantially as and for the purpose set forth.

3. As a means for locking the take-up U in an elevated position, and in combination therewith, the pin V, having the shoulder o, and adapted to be moved vertically beneath and raise said take-up, and the spring-plunger W, arranged to move horizontally toward and to engage with said pin, substantially as and for the purpose shown and described.

4.. In combination with the presser-bar D, the cam-lever H, having two cam-surfaces of different sizes, one on each side of its fulcrum or pivot, whereby said cam-lever is adapted to raise said presser-bar to different heights when turned in opposite directions, substantially as and for the purpose specified. I

5. In a sewing-machine, in combination with a presser-bar having a guide-arm extending laterally through the head toward the side on which the operator sits, a cam-plate arranged on the side of the head adjacent to the operator, and adapted to raise and lock in an elevated position said presser-bar, substantially as and for the purpose shown.

In testimony that we claim the foregoing we have hereunto set our hands this 18th day of August, 1880.

EDWARD W. MULLIKIN. HENRY G. HARTLEY.

WVitnesses:

JOHN F. CHORPENNING, H. S. BRADLY, J r,

Images