IMPROVEMENTS IN APPARATUȘ FOR SHEARING AND PUNCHING METAL PLATES AND OTHER ARTICLES
Year: 1882

page_text: LETTERS PATENT to Adolph Julius Lehmann of West Hartlepool in the
County of Durham for an Invention of IMPROVEMENTS IN APPARATUȘ
FOR SHEARING AND PUNCHING METAL PLATES AND OTHER ARTICLES"
(Void by reason of the Patentee having neglected to file a Specification
in pursuance of the conditions of the Letters Patent.)
PROVISIONAL SPECIFICATION left by the said Adolph Julius Lehmann at
the Office of the Commissioners of Patents on the 11th November 1882.
ADOLPH JULIUS LEHMANN of West Hartlepool in the County of Durham
"IMPROVEMENTS IN APPARATUS FOR SHEARING AND PUNCHING METAL PLATES AND
OTHER ARTICLES
32
My Invention relates to apparatus for shearing and punching metal plates and
other materials or articles such for instance as cardboard, leather or gutta percha,
whether flat curved or corrugated, and the said apparatus may be constructed for
very heavy or for very light work, and it may be operated by mechanical or by
hand power according to the size and purpose for which the machine is intended
In constructing the apparatus according to my Invention I provide two sheaves
made of or faced with tempered steel to maintain a keen edge and secured to
spindles or shafts fixed in a frame in such a manner that the discs of the sheaves
overlap each other and at the other ends of the spindles or shafts are provided
spur wheels geared into each other and to one of these spindles or shafts which
may be called the driving spindle or driving shaft a rotary motion is imparted by
any suitable means.
The metal plate or article to be sheared is applied to the sheaves, the overlapping
edges of which shear it in pieces by a continuous motion which is as readily
applicable to curved and corrugated surfaces as to flat ones, and the line of division
may take any required direction by presenting the plate or article at the requisite
angle or angles.

page_text: If a slot be made in any part of a plate away from the edge sufficient to admit
the overlapping edges of the sheaves a hole of almost any shape and size may be
cut out.
When this method of shearing is used for heavy plates they must be supported
on and secured to a travelling bed so arranged as to move at a speed corresponding
to the circumferential velocities of the sheaves between the edges of which the
plate to be operated upon is thus made to pass
If only one of the sheave-spindles or shafts be provided with a rotary motion
the other sheave may be left to revolve of itself, and the shearing effect will be the
same: the advantage of this arrangement is that a small sheave may act in
conjunction with a larger one and the operation of shearing is facilitated when the
required line of division is a sharp curve
By providing several pairs of sheaves secured to as many spindles or shafts
working in connection with each other but fixed in different suitable positions to
one frame; the machine or apparatus may be so constructed that the metal plate |
or article to be operated upon may be sheared into a number of strips.
For the purpose of increasing the utility of the said apparatus, I may cause the
driving spindle or shaft to work a punch or a number of punches by means of an
excentric or excentrics or other equivalent means, each punch being provided with
a die and the usual fittings; or in order to punch several holes for each revolution
of the shaft or spindle I provide another shaft fixed in the frame at right angles to
-the driving shaft,-to-which-it is geared by worm-and-worm wheel or other suitable
contrivance and provided with any required number of eccentrics or their
equivalents, according to the scope of the machine, which eccentrics may be set to
different positions to act consecutively, and in order to vary the pitch of the
-punches to different work I may secure these eccentrics. or their equivalents-to-the-
shaft by means of studs screwed into a slot, making them adjustable to any required
positions, and corresponding to this arrangement I may provide a set of die beds
constructed for different pitches, which die beds may be changed as required; the
punches may also be provided with guide plates corresponding to the die beds and
so arranged as to be readily changed when required. The said apparatus may be
constructed to act as a shearing machine only, or as a shearing and punching
machine combined.