US588275A - Joseph higham - Google Patents

Description

(No Model.)

-J. HIGHAM. GLU'I'GH FOR SEWING MACHINES.

Patented Aug. 17, 1897.

UNITED STATES PATENT OFFICE.

JOSEPH HIGHAM, OF VVIGAN, ENGLAND.

CLUTCH FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 588,275, dated August 17, 1897. Application filed April 20, 1897. Serial No. 632,985. (No model.)

To ctZZ whom it may concern;

Be it known that I, JOSEPH HIGHAM, a subject of the Queen of Great Britain, residing at Wigan, in the county of Lancaster, England,

ing it from revolving in a backward direc tion, this backward movement being so liable to cause damage, more or less, to the needle, thread, and fabric. a

The invention will be understood from the following description, reference being had to the accompanying drawings, in which- Figure 1 shows my invention, partly in section, applied to the balance-wheel and actuating-shaft of a sewing-machine; Figs. 2 and 3, detail views of my invention separated from the wheel, Fig. 2 being an obverse view of my device and Fig. 3 the reverse view thereof, but with the hand-wheel F removed.

In the figures, a is the balance-wheel,mount ed loosely on the needle-actuating shaft 1),

the shaft.

D is a disk, and C a sleeve mounted on the shaft 1). One end of this sleeve 0 and the end of the boss of the disk D abutagainst the wheelA.

E is a cam also loosely niounted'on the sleeve 0 against the face of the disk D, and

F a small hand-wheel or disk for turning the cam, the cam and hand-wheel being coupled together by a pin V.

' G is a friction-washer, and H a recessed steel collar on the outer end of the sleeve 0, all being secured by the nut I.

J and K are two curved links pivoted to the disk D and to the link L, which latter is pivoted to the balance-wheel a at M. The

'tionary.

formed as a pawl to engage with the teeth of the wheel A.

P is a check-pin secured to the curved link K and projecting through the segmental slot T in the disk D into the path of the cam E.

In action when the wheel a, is turned in the direction of the left-hand arrow N the pawl L will engage the teeth in the wheel A, which, being keyed to the shaft 1), causes the latter to rotate; but when the said wheel is rotated in the direction of the left-hand arrow 0 the pawl is raised clear out of engagement from the teeth, and the Wheel a, being loose on the shaft, will revolve without actuating the shaft at all. That is to say, when the wheel a is revolved in the forward direction the combined action of the links J, K, and L and the disk D is such as to insure a perfect grip on the wheel A to revolve the shaft, while when revolving in the backward direction the engaging point of the link L is raised just clear of the teeth of the wheel A, and the link K is-also raised until'it-s check-pin P arrives at the outward end of its segmental slot T in the disk, as shown in Figs. 2 and 3, and thus while all the links J, K, and L and disk D arerevolved in the backward direction the shaft 19 itself remains at rest.

The. machine is pdt permanently out of gear for bobbin or spool winding by rotating the cam E by turning the wheel F until the abutment Q comes against the pin P, and thus holds the pin permanently raised, which prevents the link L from engaging the teeth in the wheel A. The wheel a can then be freely rotated, while the shaft remains sta- It is put into gear again by rotating the cam E in the opposite direction until the abutment R arrives at the stop-pin S. The link L is then free to engage the teeth in the wheel A, when the wheel a is revolved in the forward direction N. The cam E may be provided with a spring so arranged as to enable it to look in the disk D at each end of its stroke-namely, when its shoulder R abuts against the pin S or when its other shoulder Q abuts against the pin P, thus retaining the cam in either of its required positions when the machine is in motion.

I declare that what I claim is 1. In a sewing-machine, a balance wheel or pulley mounted loosely on the actuating shaft, a ratchet-wheel keyed to the said shaft and a link or pawl L pivoted to the balance wheel or pulley, in combination with a disk mounted loosely on the shaft, links pivoted thereto and to the link L in such a manner that the pawl will only engage the ratchetwheel and drive the shaft one way substantially as set forth.

2. In a sewing-machine, a balance-wheel mounted loosely on the actuating-shaft, a ratchet-Wheel keyed to the said shaft and ratchet-links L J K having pin P, in combination with a cam E with suitable handle capable when turned of pushing pin 1 aside and holding the ratchet-link L out of gear with the ratchet-wheel until such time as the cam is reversed substantially as and for the purposes described.

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

JOSEPH IIIGIIAM.

\Vitnesses:

G. C. Drnoxn, W. II. BEEsToN.

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