US139770A - Improvement in button-hole sewing-machines - Google Patents

Description

U NITEDA STATEs PATENT .OEEICE SHERMAN oLEMINsHAw, or TROY, NEW YORK.

IMPROVEMENT IN BUTTON-HOLE SEWING-MACHINES.

Specification forming part of Letters Patent No. 139,770, dated J une 10, 1873; application filed December 7, 1872.

in the Stateof New York, have invented certain new and useful Improvements in Button Hole Sewing-Machines; and do hereby declarc that `the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings and to the letters of reference marked th ereon, making a part of this specilication.

My present invention is intended as an improvement upon the Button-Hole Sewing-Machine for which Letters Patent were granted to lne-J une 25, 1872, antedated June 15,1872; and the nature of my invention consists, first, in a device for automatically opening and closing the jaws of the cloth-holder; second, in the mechanism for rotating said cloth-holder; third, in a device for beatin g the4 stitch over lthe edge of the goods; fourth, in a gage for adjusting the cloth on the holder; fifth, in a device for raising the shuttle up far enough to permit the loop to pass freely under and out of the shuttle-case; and sixth, in the takej up device-all of which will be hereinafter more fully set forth. j

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawings, in which- Figure 1 is a frontview of the machine with my improvements attached. Fig. 2 is an enlarged plan view of the cloth-holder, with the mechanism for opening and closing the jaws of the same. Figs. 3 and 4 show the mechanism for rotating the cloth-holder. Fig. 5 is a perspectiveview of the beating device. Fig. 6 represents the device for raising the shuttle to allow the loop to pass under the same and out ofthe shuttle-case. Fig. 7 shows the take-up device; and Fig. 8, the gage for adjusting the cloth on the holder.

. A represents the arm of the sewing-machine,

freely on the cross-bar G of the cloth-holdersl said stirrup being held in position by pins d attached to the cross-bar and working through slots e on the stirrup. At the opposite end of the stirrup E is another pin, f, passing inward onto the lever H. N ow, when the work is to be put on, the whole revolving clothholder is drawn toward the operator, the geared dog D meshing in and engaging with the rack a, and, the said rack being on a proper circle. a continuation of the movement causes the dog D to partlywrevolve, and pressing on the lever H and drawing up the sliding-stirrup E. By means of this action the dog D and the pin f simultaneously cause both of the levers H H to open the jaws IL h and allow the Work to be put, on at the end of the arm or tip I, the lever H passing into the opening in the end of the curved arm G, which acts as a guide to bring the dog D in proper position with the rack a. The jaws are held open by means of a catch, J, pivoted on the curved arm U and catching on the dog by means of a notch in the dog,

and is held up to its position Aby a spring, After the work is placed uponthe end of the` cloth-holder or tip NI, then, by pushing the whole cloth-holder back to its original position, the catch J leaves the notch in `t-he dog l' D and allows the whole arm toswing out of arm meshes into and engages with the Worm L, on an upright shaft, 7c, at the side of the head B. The revolving motion is now imparted to the cloth-holder by means of "the rotating-worm L, thus producing the feed. Motion is given to the worm L by ymeans of the feed bar M, shown in Fig. 4, and the slotted driver N attached to the end of the feed-bar, this slot-ted driver working on a pin, m, in another slotted bar, O, through the end of which the shaft 7c passes. On the plate or bar O is a spring-pawl, n, engaging with a ratchet-wheel, p, upon the lower end of the shaft 7c. By this device the worm Lis caused to revolve in one direction at every stroke of the feed-bar. Motion is imparted to this feedbar by means of a cam on the driving-shaft of the machine, together with arlever, l?, pivoted to the under side of the bed of the machine.

The pin mis made adjustable in the slotted bar O, by which means the length of the stroke of said slotted bar may be regulated, causing the worm to turn more or less as desired, and thus producing greater or less rotation of the cloth-holder, and making a longer or shorter stitch.

In Fig. 5 I have represented the stitchbeating mechanism. R represents a iiat piece of sheet-steel of the construction shown in said figure, which is fastened to a stud, r, and sliding-plate S, said plate sliding ou the bed of the machine backward and forward, motion being given by means of a suitable stud and roller, worked by a cam on the main driving-` shaft underneath. This beater-bar R lies iiat with the plate ofthe machine, and about threeei ghths ofan inch aboveit and the cloth-holder, and extends just beyond the place where the needle comes down. To the bar R on the upper side is attached a wedge, s, and as the bar is thrown back at each stroke ofthe cam this wedge, working on a roller, t, causes the bar to sink to the level of the bed-plate, and on its return to resume its original position. This movement is to beat the stitch over the edge of the goods, at the same time hauling it down. The roller t is fastened to a stud, o, on the plate of the machine, and is adjustable up and down in a slot in the same, with a nut -on the rear side. T represents a thin steel gage pivoted to the bed-plate and working on a screw, w, to which screw is fastened a spring, x, pressing against a pin, y, on the gage and keeping the inner' end of the same against a pin, z, on the bed-plate, as shown in Fig. 8. 'The iront of this gage T is provided with slots u a', to allow the cloth-holder to pass and repass and not interfere with the projecting tips of said holder, of which there are two, the top one having the hole for the needle to pass through, and the bottom one to support the holder when in position ready for work. When the cloth is put upon the holder, (the jawsbein g open,) and the holder is pushed back` the jaws begin to close as above dedescribed. Then when the jaws are nearly closed the holder begins to pass the gage T, and while passing it the cloth is to be drawn by the fingers of the operator up and against' this gage, which makes the edges ofthe hole even and true; and just as the holder is lea-ving the further end of the gage the jaws shut tight on the work, and by continuing the motion the holder passes on and away from thegage` and into its place under the needle. The object of the spring x and pins y z isto allow the gage to yield as the operator draws back the cloth-holder, the edge of the goods having been enlarged by the stitching. V represents the head of the machine,in which the shuttle is held as described in my former patent. At the side of the head is pivoted a lever, w, as shown in Fig. 6, said lever having at its top end an adjustable pin, b. The lower end of the lever w is bent inward and extends down to and near the bottom of the shuttle. A is a cam attached to and rotated by a horizontal rod, d', running across the top of the machine, andy which rod receives its motion by means of suitable gearing from the main driving-shaft of the machine. e is a spring bearing against the piu b on the lever w, to hold the same up against the cam A. As the loop is passing over the shuttle the lever w, by the motion of the cam A. passes under the shuttle and raises it up enough to permit the loop to pass freely under and out of the shuttle-case. After the loop is out the cam A permits the lever w to resume its position, which isjust clear ofthebottom of the shuttle. Upon the rod'cl, on the face of the head V, is another cam, Bf, as shown in Fig. 7. O represen ts a take-up, pivoted to the h ead and provided at its upper end with a roller, f', which is held up'against'the'cam B by a spring, h', arranged with an interior rod placed on a stud on the take-up, and the other end passing through a bent bar, D. This arrangement acts as a take-up to hold the slack thread, and by the action of the cam B todeliver it to the needle as required.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is- 4 l. The curved arm C, having its outer end forked or cut open, and provided on the concave side with a rack, ct, substantially as and for the purposes herein set forth.

2. In combination with the cloth-holder, the loose stirrup E, with pin f, and the cogged or geared dog D, constructed and operating suhstantially as and for the purposes herein set forth.

3. In combination with the geared dog D, arranged and operating as described, the catch J, and spring i, substantially as and for the purposes herein set forth.

4. The combination, with the swingingclothholder, of the rotating worm L, and the gearwheel K for the purpose of rotating the same, substantially as herein set forth.

5. The combination of the feed-barM, slotted driver N, adjustable pin m, slotted bar YO, spring-pawl n, and the ratchet-Wheel p, upon the shaft k, for rotating the Worm L, substantially as and for the purposes herein set forth.

6. The beater-bar R, connected with the sliding plate S, and provided with the Wedge s, in combination with the adjustable roller t,

\ all constructed and arranged substantially as and foi` the purposes herein set forth.

` 7. The pivoted gage T, provided with slots a', and operating in combination with the spring a: and pins y and z, substantially as and for the purposes herein set forth.

Witnesses:

C. L. EVERT, CHARLES A. SEYMOUR.

Images