An Improved Lasting Machine.
Year: 1899

page_text: Date of Application, 25th May, 1899-Accepted, 8th July, 1899
An Improved Lasting Machine.
We, KARL MACK and JOSEPH WEBER, of Offenbach on the Main, in the Empire
of Germany, Manufacturers, 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:
The devices at present employed for stretching leather on lasts are either simple
pincers and peg drivers, or very complicated machines. The former are not
effective, and the latter are not very recommendable, being above all very
expensive.
This invention has for its object to provide a lasting machine, which, in spite
of being extremely complete and perfect, is very simple and therefore inexpensive
whilst its effectiveness is at least equal to that of the dearest machines.
In the accompanying drawings,
Figure 1 is a side view, and Figure 2 an end view of this improved machine,
whilst Figures 3 and 4 are detail views and Figures 5 and 6 show the working of
the principal parts of the machine in two different positions for use.
The machine acts by the leather being gripped by a peculiarly shaped gripper
or pincers and drawn over the last, after which a pin or peg is inserted by means
of an automatic peg feed at a suitable place and driven in by means of a peg
driver. The essential novelty consists mainly in the operation of the parts for
stretching the leather over the last. A snail cam b is mounted on the front end of
the power conveying shaft a. This cam operates the peg driver which is pressed
downwards by means of a spring, and the lower end of which is carried in a
foot in which the striking bolt 2 is guided. The foot d is laterally recessed, and
the feed chute e opens into this recess, its other end being connected with a disc f
loosely mounted on the shaft a. The dise f forms the side closing plate for the
pin or peg drum g mounted on the shaft a.
is
The leather stretching device consists essentially of the pincers shown in
Figure 4. These pincers differ from those hitherto employed, in one jaw h being
formed as a toothed wheel and revolving with the shaft . The other jaw
pivotally mounted on the former and is held open by means of a spring 2. Further
it carries in front, a roller ³. On this roller there presses a curved piece 7 which
is held or guided in the machine frame A by means of a rod in such a way that
it holds the pincers closed during their whole rotation or oscillation and only
allows them to open when a pin eccentrically mounted on the face of the shaft a
lifts said rod and curved piece. In the base B of the machine, a slide n is arranged
which pushes the leather stretched by the pincers over the last at the place where
it is to be pegged, the striking bolt passing through a recess n¹ (Figure 3) when
driving in the pin or peg. The movement of the slide n takes place by means of
a camo also mounted on the shaft a and which acts on a double armed lever p.
which engages a cross slide with its lower end. The slide a transmits the move-
ment by means of inclined planes to the slide n. The movement of the pincers
akes place by means of a lever r mounted on the shaft i, with which lever ŕ there
engages a rod s operated by a cam t mounted on the shaft a.

page_text: The machine hereinbefore described, works in the following way.
The last C over which the leather is to be stretched, is held in front of the
machine in such a way that the pincers engage the leather. On the rotation or
oscillation of the pincers, the leather is thus stretched at the point in question
and simultaneously receives an incision. This nick or incision is made by means
of a knife (Figure 2) over the front bent back end of which the leather in
turning is drawn. By means of this incision the part of the leather engaged by
the pincers is freed and the leather is pushed by the slide over the last (Figure 6)
whereupon the peg driver descends and pegs it fast. The curved guide then
lifts, causing the pincers to open. The latter return (or move backward) opened,
and engage the leather after the last has been suitably raised afresh and the
procedure is repeated.
It must further be mentioned as an advantage of this improved machine
that in the machines at present employed, the drawing taut or stretching of the
leather, takes place by means of rigid mechanisms, frequently causing the leather
to be torn, more particularly when the finer sorts are employed, whilst in the
present machine, the stretching takes place by means of a spring mounted on
the rod, the stretching of which spring may be adjusted to suit any kind of
leather by an adjustment of its lower support.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
A lasting machine characterized by the stretching of the leather being effected
by means of revoluble or oscillating pincers (hh), the movable arm of which (¹)
carries a roller (73) running on a spring mounted curved guide (/) and the leather
being passed over or drawn against a knife (u) by the turning of the pincers and
thus provided with suitable incisions, substantially as hereinbefore set forth.
Dated this 21th day of May 1899
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicants.