US809566A - Sewing-machine feed and loop-taker actuating mechanism. - Google Patents

Description

No. 809,566. PATENTBD JAN. 9, 1906.

M. HEMLEB.

SEWING MACHINE FEED AND LOOP TAKER ACTUATING MECHANISM.

APPLICATION FILED JUNE 12, 1905.

%Wmeooao 1'0 all whom it may concern.-

UNITED STATES PATENT OFFICE.

MARTIN HEMLEB, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Jan. 9, .1906.

Application filed June 12, 1905. Serial No. 264.769.

Be it known that I, MARTIN HEMLEB, a

' citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Sewing-Machine Feed and Loop-Taker Actuating Mechanism, of which the following is a specification, reference being had thereinto the accompanying drawin s..

This lnvention relates to an improvement in that class of sewing-machines comprising a hollow bracket-arm having journaled therein the main shaft, from which is derived by separate connections the operative reciprocatory movements of the lower feeding mechanism and the more rapid rotary movements of the loop-taker shaft, the latter being effected through a non-metallic belt; and the inventionhas forits object to provide means whereby the metallic connections between the main shaft and the feeding mechanism beneath may be kept thoroughly oiled without injury to the non-metallic-belt connection between the main shaft and loop-taker shaft by oil thrown from such positive connections in V the operation of the machine and it has for its further object to provide meanswhereby the non-metallic belt may be readily accessible for renewal without disturbing the main shaft in its bearings, as has heretoforebeen necessary.

I The invention consists, essentially, in a main shaft journaled in the bracket-arm and provided within the latter with positive con nections with feeding mechanism disposed beneath the bed-plate and having exterior to. said bracket-arm a pulley or sprocketwheel connected with 'a similar wheel upon the loop-taker shaft by means of a non-metallic belt.

It also consists in a removable housing inclosing the connection between the main and loop-taker shafts.

The invention will be understood by reference to the drawings annexed, in which Figure 1 is a side elevation of a sewingmachine of the Singer revolving-hook type with the rear portion partly in section to expose the construction and arrangement of the main shaft connections with the looptaking and feeding devices; and Fig. 2 is a rear end elevation of the same with the balance-wheel and rear end of the belt and pulley housing removed.

The frame of the machine is constructed with the usual bed-plate 1 and the overhanging bracket-arm 2, in which is journaled the main shaft 3, provided with the feed-actuating and feed-lifting eccentrics '4 and 5, embraced, respectively, by the straps 6 and 7 of the connecting-rods 8 and 9, pivotally connected with suitable crank-arms 1'0 and 11 upon the feed-actuating and feed- lifting rockshafts 12 and 13, respectively, mounted beneath the bed-plate 1. The columnar portion of the bracket-arm directly above the eccentrics 4 and 5 is provided with a removable cap 14 for access to such parts, the connecting-rod straps being provided with the usual perforated bosses 15, by which they are provided with oil. The machine is provided with the usual reciprocating needle-bar 16,

deriving its reciprocating movements from the main shaft and carrying the needle 17, cooperating with a loop-taker 18, mounted upon a rotary loop-taker shaft 19, journaled in suitable bearings beneath the bed-plate and having at its rearward end the sprocket wheel 20, connected by the perforated nonmetallic belt 21, preferably of rawhide, with a sprocket-wheel 22, of larger diameter, fixed upon the rear end portion of the main shaft 3 outside of the bracket-arm 2.

As represented in the drawings, the sprocket- wheels 20 and 22 are formed of cylindrical pulleys provided with spaced radial pins 23, adapted to enter the holes 24 in the connecting-belt, the latter being twice the diameter of the former to impart to the loop-taker shaft two rotations to each one of the main shaft, and each of said pulleys is provided with a hub and set-screw 25, by which it is secured upon its respective shaft.

A housing 26 of rectangular cross-section is applied to the rear end of the bracket-arm to inclose the sprocket- wheels 20 and 22 and the connecting-belt 21, perforated studs 27 being provided in said housing through which are extended the fastening-screws 2S, entering threaded apertures in the bracketarm for securing the housing firmly in position thereon.

ICO

From the nature of the perforated belt connecting the pulleys and 22 it is'evident that the spattering of oil thereon from the metallic connections of the upper and lower shafts is highly objectionable in affecting the length of such belt, as well as its durability. By the present improvement the columnar portion of the bracket-arm is formed in pracimportant advantage in the accessibility of less band for such use.

the belt 21 for renewal. In sewing-machines heretofore provided wth such driving means for the lower rotary shaft the inclosure of the belt and sp1'ocketwheels within the hollow upright portion of the bracket-arm has necessitated the withdrawal of the main shaft from its bearings and the consequent disengagement of its connections with other parts of the machine to permit of such operation, the belt being necessarily in the form of an end- By the present improvement the renewal of the belt 21 requires merely the removal of the balancewheel 29 by the loosening of its set-screw 30 and the subsequent detachment of the housing 26 by withdrawal of its fastening-screws 28, when the old belt may be readily slipped off the pulleys over the short pins 23 and a new one applied, when the machine will be again placed in readiness for operation by the reapplication of the housing 26 and balance-wheel 29.

It will thus be seen that the application of the pulleys and connecting-belt to the .respective shafts involves two important functions in not onlyinsuring the belt from becoming moistened with oil from the metallic connections, but in affordin easy access for rethe main shaft with parts of the mechanism actuated thereby.

Having thus set forth the nature of the invention, what I claim herein is 1. In a sewing-machine, the combination with the frame comprising a bed-plate and a hollow bracket-arm, and a rotary main shaft journaled in the bracket-arm, of stitch-forming mechanism comprising a loop-taker and a rotary shaft mounted beneath the bedplate for imparting a rotating motion to said loop-taker, feeding mechanism disposed beneath the bed-plate, metallic connections disposed within and inclosed by said bracketarm intermediate the main shaft and feeding mechanism, pulley-wheels mounted upon the main and looper shafts external to said bracket-arm, a non-metallic belt connecting said pulley-wheels, a housing inclosing said pulley-wheels and connecting-belt, and means for removably securing said housing to said bracketarm.

2. In a sewing-machine, the combination with the frame comprising a bed-plate and a hollow bracket-arm formed with two closed vertical compartments one removable from the other and means for securing the same together, and a rotary main shaft journaled in said bracket-arm and extending through the upper portion of both of said compartments, of a plurality of lower shafts mounted beneath the bed-plate, pulle vwheels applied to said main shaft and one of the lower shafts within the removable compartment of said bracket-arm and a non-metallic belt con necting said pulleys, and metallic connections within the other compartment of said bracketarm intermediate said main shaft and others of the lower shafts.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses MARTIN HEMLEB.

Witnesses:

HENRY J. MILLER, HENRY A. KORNEMANN.

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