Year: 1888

page_text: I HERMANN GUHL of Graskeller Hamburg in the Empire of Germany Manufacturer
do hereby declare the nature of this invention and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement:-
This invention relates to the journalling of rotary shuttles in sewing machines
and its object is to so journal or support the shuttle that wear thereof or of the race
shall be as small as possible, and furthermore to provide for adjustment of the race to
compensate for such wear as occurs so that the travel of the shuttle may be always
regular and true, and the work performed therefore more satisfactory.
Reference being made to the accompanying drawings
Fig. 1 is a lateral elevation of the improved mechanism.
Fig. 2 is a plan view Fig. 3 a horizontal section of a part and Fig. 4 a front
elevation partly in section.
Figs. 5 and 6 are respectively lateral elevation and sectional plan of the mechanism
at present in use, these figures being shown for more clearly explaining the
improvements.
S is the shuttle P is the bed having the groove or race n recossed in its rim o is
the plate screwed to the said bed covering and enclosing the race n. w is the shaft
carrying the shuttle driver d. In the construction shown in Figs. 5 and 6 the rim of
the shuttle and also the race n become worn by the peculiar action of the driver and
there are no means for compensating for such wear.
In the improved construction the driver d is formed integral with, or its function is
replaced by the circular holder K fixed centrally on the shaft w. This holder carries
in its rim a chamfered groove m³ in which lies a similarly chamfered flange m² on the
shuttle S-The rim of the shuttle is not subjected to any peripheral wear since the
shuttle is held centrally by the holder k. The plate o abuts upon the outer face of
the rim of the shuttle so that the latter is securely held in place by said plate on the
one side and the rim m' of the holder k on the other side To compensate for wear
the ring o is fastened to the bed plate in a novel manner whereby it may be fixed at
desired distance therefrom and held securely in the position given to it-To this end
three or more pillars a are screw threaded at their ends to screw into holes tapped in
D37

page_text: the bed plate The body of the pillars is preferably of prismatic form-In the upper
ends of the pillars are tapped holes into which flat headed screws e engage-The
screws e pass through holes in the plate o and by screwing down said screws the
plate o is securely fixed between the heads of the screws and the upper faces of
the pillars a-The pillars a are thereby prevented from turning and remain in the
position given to them before screwing up the screws e. To adjust the height of
the pillars a from the bed plate, the screws e are unscrewed and the pillars may be
turned by a suitable spanner or otherwise until they are in the position desired,
the screws e are again screwed down and the plate is held in the position
required.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what 1
claim is ;-
1. In rotary shuttle sowing machines the combination with a shuttlo having a
flange m of a holder k having a rim m³ supporting said flange, and a plate o
substantially as set forth.
2. In rotary shuttlo sewing machines the combination with a shuttle, centrally held
by a device upon the driver shaft, of a plate o abutting upon the rim of the
shuttle, prismatic pillars a having screw threaded ends and screws d substantially as
set forth
Dated this 28th day of March 1888.
HERBERT & Co.,
18, Buckingham Street, Strand, W.C., London,
Agents to Applicant.