US1263239A - Sewing-machine. - Google Patents

Description

l. HEGGI'E. SEWING MACHINE. APPucATloN FILED APR.13.1915.

'Patented Apr. 16, 1918.' A

J. HEGGIE. SEWING MACHINE. AePucAloN man APR. 13. w15.

Patented Apr. 16, 1918.

2 SHEETS-SH EET 2.

/NVENTH JAMES HEGGIE, 0F CLYDEBANK, SCOTLAND, ASSIGNOR T0 THE TURIN G COMPANY, A CORPORATION OF NEW JERSEY.

SEWING-MACHINE. i

To all whom t may concern:

Be it known that I, JAMES HEGGIE, a subject of the King of the United Kingdom of Great Britain and Ireland, and residing at Glydebank, Dumbartonshire, Scotland, have invented acertain new and useful Improvement in Sewing-Machines', of which the following is a specification.

This invention relates to improvements in sewing machines, particularly glove sewing machines of the type fitted with an upright post for receiving the looper spindle, for uniting by means of a pique seam the overlapping edges of the body and the fourchettes, etc., and has for its primary object to provide a machine of this class which oii'ers greater convenience in use and in which the' stitch-forming operation is effected silently, with greater precision and at higher speed than heretofore.

In the accompanying drawings Figure 1 is an end elevation of a sewing machine embodying the invention, the base of the machine frame being shown in section; Figs. 1EL and 1b show details; Fig. 2 is an inverted plan of the machine base.

Referring to the drawings, a machine embodying the invention comprises a frame 1 hinged at 2 to one edge of a tray-like base 3, said base 3 being formed integral with va receptacle 4 projecting from itsforward edge adjacent to the stitch-forming mechanism, and adapted to receive a spool 5. The said receptacle 4 is formed with a hinged lid 6 having a depending bracket 7 supporting a horizontal pin 8 on which the spool 5 is mounted. v f

Mounted in the overhanging arm of the Vmachine frame 1 is the main vdriving shaft 9 carrying at its rearward end the usual band wheel 10 and serving to transmit through suitable connections vertical reciprocating movements to the needle bar 11 and lifting and feeding movements to the presser bar 12. Y

.In the upright member 13 of the bracket arm is housed a vertical shaft 14: which receives rotary movements from the main driving` shaft 9 and carries at its lower end a crank disk 15 fitted with a crank pin 16 to which isconnected one end of a pitman 17 the other end of which is connected to a swinging looper driving arm 18 pivotally supported from the machine base and formed with a cam slot 19 entered by a cam.

'Specification of Letters Patent.

SINGER MANUFAC- j Patented Apr. 16, 1918.

Application filed April 13, 1915. VSerial No. 21,175.

followerV (roller20) carried by a crank 214 l on the looper spindle 22, so that on rotation of the main shaft 9 oscillatoryjmovements are imparted to the looper. The pitman'17 comprises a rod 17 whose opposite ends are threaded into the terminal pieces 17". and

held against turning relatively to said terminal pieces bysuitable lock-nuts 17.

As will be seen from the drawing, the cam-slot 19 is of curved form and is preferably convexed toward, although not necessarily directly toward, the pivot of the arm 18. As the arm18 is vibrated to-and-fro, substantially the central portion of camslot 19 crosses the axis of the looper-spindle 22 carrying the crank 21 which extends. preferably in a general direction away from the pivot of the arm 18 and terminates in the 4cam-follower 20. When .the arm 18 is at the extremity 0f its-movement the ends of the cam-slot 19 are preferably extended away `from the axis 0f the looper-spindle 22, as illustrated in Fig. 2. Starting at the position shown in Fig. 2, as the shaft 14 rotates, the arm 18 is moved to the right and first imparts a relatively rapid turning move-v ment to the looper-spindle 22. This movement is slowed up as the cam-follower 20 rounds the bend at substantially the central portion of the cam-slot 19 and enters the lower end-portion of said cam-slot which is nearly straight and substantially tangent to its circular path of movement about the pivot of the arm 18. Therefore, when the cam-follower 20 reaches this portion of the cam-slot 19,the looper-spindle will pause. In the reverse movement of the arm 18 the initial pause of the looper-spindle l22 will be followed by an accelerated motion as the cam-follower 2O rounds the bend in the camslot and enters the upper end-portion of said cam-slot, as will be obvious to Vthose skilled in the art. Thus, the form of the cam slot- 19 is such that there are produced the pause and accelerated motion required for the production of a perfect double-loop stitch with.v

lengthen or shorten the pitman 17 in a well known manner, after which the lock-nuts may be r'etightened. l

'lll he presser bar 12 reciprocates in a guide carried by a bracket 23 pivoted at its upper.

end and forming a pendulum support for the presser bar, oscillatory movements around a horizontal axis being imparted to the bracket.

rEhe presser foot 2/l, 25 is divided or split in the direction of the length of said foot. lin order that the halves may be readily adjusted relatively to one another so as to provide for the unequal thickness of the work due to the overlapping of the edges to be united, the forward half, that is to say the accessible half 211, of the presser foot is fitted soas to be slidable vertically relatively to the rearward half 25 to which it is connected by a screwV 26 passing through a slot in said forward half and threaded into the presser bar 12. The forward half 24 of the presser has an upward extension 27 having an aperture at its upper extremity to receive an eccentric 28 mounted on a pin 29 projecting from a block or collar fixed to the presser bar; fixed to said eccentric 28 is a disk 31 having perforations, serrations or the like on its forward face adapted to cooperate with an index finger32 tted to the pin 29. lt will be understood that the operator by rotating the disk 31 and therewith the eccentric 28 will adjust the forward half 24C of the presser foot, the index 4iin 'er 32 enoaoino one ofthe erforations E3 2D C for the like and serving to lock the disk 31 in any desired position of adjustment.

The presser-foot mechanism described herein is not claimed since it forms the subject-matter of my divisional application Serial No. 169,885, filed May 18, 1917.

While I have shown and described what l consider to be the preferred form of the invention, it is to be understood that the form ,and arrangement of the essentialV elements are susceptible of modification within the scope of the invention.

1t is to be understood that all novel features of the present improvement as shown anddescribed herein are of my invention.

"I claim Y A y 1. 1n a sewing machine, in combinatioma rotating shaft, a pivoted arm deriving oscillatory movements from said shaft, said arm being formed with a curved cam-slot, a looper-spindle having its longitudinal axis disposed substantially `in parallelism with the axis of oscillation of said arm, av crank on said spindle, and a follower carried by said crank and entering said cam-slot, said cam-slot having an operative por-tion extending in a direction substantially tangent Ito thejcircular path of movement `of, said "portion as determined by the loscillation of said arm.

2. ln a sewing machine, in combination, a rotating shaft, an eccentrically mounted member carried thereby,"a pivoted arm having a cam-track, link connecting said arm to said eccentrically mounted member, and aV looper-supportlng spindle having its longitudinal axis disposed substantially in parallelism with the axis of oscillation. of said pivoted arm and providedv with a crank-arm, said crank-arm having a cam-follower en gaging said cam-track, said cam-track having a pause-producing operative portion substantially tangent to the path ofk movement of said portion as determined by the oscillation of said arm and also having an operative portion extending linfa direction at an angle to said pause-producing portion.

8. ln a sewing machine, in combination, a rotating shaft, a pivoted arm deriving oscillatory movements from'said shaft, said arm being formed with a curved cam-track which is convexed toward the pivot of said arm,

a looper-spindle having its longitudinal axis disposed substantially in parallelism with the axis of oscillation of said arm, and a crank on said looper-spindle having a camfollower engaging said cam-track.

l. In a sewing machine, in combination, a rotating shaft, a pivoted looper-driving ,arm deriving oscillatory movements-from said shaft, a looper-spindle, said arm being formed with a curved cam-track convexed toward the pivot of said arm, said pivot being so positioned that substantially the central portion of said cam-track is adapted to 100 be intersected by the axis of said looper- 'spindle when vibrated to-and-fro across said axis, and a crank on said looper-spindle extending in a general direction away from the pivot of said looper driving arm and 105 having a cam-follower in engagement with said cam-track.

5. ln a sewing machine, in combination, a rotating shaft, a looper driving arm deriving oscillatory movements from said shaft, 110 a looper-spindle, said arm being formed with a curved cam-track whose extremities are extended substantially directly away from the axis of said looper-spindle when said arm is at one cf'its extreme positions, 115 and a crank on said looper-spindle having a cam-follower engaging said cam-track.

6. ln a sewing machine, in combination, a rotating shaft, alooper-driving arm deriving oscillatory movements from said shaft, 120 a looper-spindle, said arm being formed with a curved cam-track whose extremities are extended 'substantially directly away from the axis of said looper-spindle when said arm is at one of its extreme positions, 125 and a crank on said looper-spindle having a cam-follower engaging said cam-track, said crank extending in a general direction away `from the pivot of said looper drivingarm.

7. A sewing machine having, in combina- '130 tion, a frame including an upright 'Worksupporting post, a looper-spindle extending pivoted arm deriving oscillatory movements from said shaft, said arm being formed with a curved cam-slot, a crank on said spindle, and a follower carried by said crank and entering said eam-slot, said cam-slot having an operative portion extending in a direction substantially tangent to the circular Copies oi this patent may be obtained for ve lcents each, by addressing the Commissioner Washington, D. C.

name to this speccation in the presence of tWo subscribing Witnesses. Y

JAMES HEGGIE.

Witnesses: l

HENRY MASON, DOUGLAS FAIRWEATHER.

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