Improvements in or relating to Machines for Attaching Sheet Metal Clamps to Boxes and the like.
Year: 1896

page_text: Date of Application, 23rd June, 1896
Complete Specification Left, 30th Jan., 1897-Accepted, 10th Apr., 1897
PROVISIONAL SPECIFICATION.
Improvements in or relating to Machines for Attaching Sheet Metal
Clamps to Boxes and the like.
A communication from RICHARD PARTZSCH, of Wachbleichstrasse 39, Dresden,
in the Empire of Germany, Draughtsman.
I, ALFRED JULIUS BOULT of 111 Hatton Garden, in the County of Middlesex,
Chartered Patent Agent, do hereby declare the nature of this invention to be as
follows:-
The object of the present invention is to fix pieces of a continuous toothed or
serrated strip of metal to articles made of cardboard, leather, wood etc. for the
purpose of fastening these objects together. The present machine differs from
previous machines in the manner of automatic feed of the endless metal strip,
which comes from the swinging hammer or from a cutter adjustable on that
hammer.
The hammer is adjustable on a swinging arm and can be fixed in any position
by a bolt. This arm swings round a pin and can be moved downwards to the anvil
against the action of a spring, by means of a treadle and connecting rods.
On the back surface of the hammer there is a cutter which can move under the
influence of a spring. This cutter projects from the hammer so that when the
hammer descends, the cutter touches the auvil first and is moved relatively to
the hammer till the latter strikes the anvil, the sharp-edged recess of the cutter, in
co-operation with the side of the hammer, cutting off the piece of the metal strip
which has passed.
To a lug on the cutter is. articulated a grooved guide which passes through a
yoke in which it is movable, and is supported by a pin. As this pin does not
coincide with the hammer arm pin there must take place a relative movement of
the guide and yoke, when the hammer swings. This movement is utilized for the
step-by-step feeding of the strip, in the following manner :-
The strip which is unwound from a drum is guided through the grooved guide
and through a recess in the cutter. It has either lateral projections or apertures
from which project spikes or teeth bent under right angle. The strip is placed in
the grooved guide with its teeth downwards and the cross section of the grooved
guide is formed accordingly with recesses for the teeth. The strip can move
relatively to the guide; but the yoke and guide are provided with spring pawls.
The teeth of the pawls of the guide engage with the recesses between the lateral
projections or holes of the strip, and owing to the way in which they are tapered,
they operate only in one direction whereas in the other direction they slide past the
projections.
When the hammer descends the yoke pawl engages with the strip which then is
held fast at the yoke whereas the grooved guide passes backwards along the strip.
But as the haminer head, swinging round its pivot pin, approaches to the.fixed yoke
the end of the strip comes into the path of the hammer. The movement of the
strip is therefore caused by the movement of the hammer and of the grooved guide
relatively to the still standing strip. In that movement the guide pawl slides over
the projections in order to engage with them at the change of stroke and to move the
strip through when the hammer rises. In this manner during the upward-movement

page_text: of the hammer a piece of the strip is unwound from the drum and moved by the
pawl in order to come under the hammer in the latter's downward movement, to be
cut and fixed. If pieces of different length have to be employed the feed must be
adjustable. The movement of the guide is the smaller the nearer the pivot pins
are to each other. The feed can therefore be made adjustable by making the
guide pin movable towards the hammer arm pin. But as the hammer itself must
be adjusted in a forward direction when treating short pieces, that mode of
arrangement would require two adjustments. Therefore it is preferable to have
an arrangement by which the hammer is adjusted at the same time without any
further operation.
For this purpose instead of the whole path of the guide only a variable part of
it is utilised for the forward movement of the strip. There is in the groove of the
guide a plate which may be in one piece with the pawl. As long as in the return
movement of the grooved guide the back of that plate is under the pawl the latter
cannot act on the strip and so the strip is caused by the pawl to move back with
the guide. After the left edge of the plate has passed under the teeth of the
pawl the strip will be held fast. The strip therefore will be moved forward to an
extent less than before by the amount equal to the return movement of this strip
which it made with the guide before the pawl came into operation. The further
the hammer with the guide is moved on its arm, the further the plate moves
relatively to the guide pawl, the later the pawl will come into operation on its
return and so the piece of strip moved forward will be so much shorter.
But apart from the adjustment of the feed, it is advisable to make the way of
the guide ample and to utilize for the above purpose only a part of it. Because if
the pawl were to engage at the beginning of the down stroke of the hammer, then
each slight movement of the hammer would cause the strip to move forward.
When the hammer rises its arm will generally swing a little to and fro until
stopped by the controlling spring. But as the pawl is inoperative in that position
of the hammer the to-and-fro movement of the arm has no influence on the forward
movement of the strip.
In order to prevent the relative movement of the cutter and hammer when the
latter strikes the anvil from having any influence on the strips, the guide of the
cutter is arranged tangentially to a circle with the hammer arm pivot as a centre
in such manner that after the cutter descends on to the anvil the said relative
movement does not cause any movement of the grooved guide. With such
arrangement of the guide the cutter passes the edge of the object to be operated upon
and its striking against it is avoided.
Dated this. 23rd day of June 1896.
BOULT & WADE,
Agents for the Applicant.
Improvements in or relating to Machines for Attaching Sheet Metal
Clamps to Boxes and the like.
A communication from RICHARD PARTZSCH, of Wachbleichstrasse 39, Dresden,
in the Empire of Germany, Draughtsman.
I, ALFRED JULIUS BOULT, of 111 Hatton Garden, in the County of
Middlesex, Chartered Patent Agent, 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 object of the present invention is to apply pieces of a continuous toothed or

page_text: the endless metal strip, which comes from a swinging hammer or from a cutter
adjustable on that hammer.
In the accompanying drawings,
Fig. 1 is a side elevation partially in section,
Fig. 2 a front view of the machine"
Fig. 3 shows in elevation the hammer carrying a movable cutter.
Figs. 4 and 5 end views of the same,
Fig. 6 shows in longitudinal section a part of the grooved guide connected with
the feed arrangement, with a guide yoke which can turn.
Fig. 7 is a plan of the same and,
Fig. 8 a cross section through the frame, grooved guide and yoke in the plane of
the axis of the yoke.
The hammer A the shape of which may be seen from Figs. 3, 4 and 5 is
adjustable on an arm B (Figs. 1 and 2) and can be fixed in any desired position by
a bolt a. This arm B swings round a pin b and can be moved downwards, to the
anvil D against the action of a spring C¹, by means of a treadle C and of connecting
rods c.
On the rear surface of the hammer is a cutter E movable under the influence of
a spring e. (Figs. 3 to 5). This cutter projects beyond the hammer so that when
the hammer descends, the cutter touches the anvil first and is moved relatively to
the hammer till the latter strikes the anvil, the sharp edges recess or slots e¹ of the
cutter in co-operation with the edge of the hammer, cutting off the piece of metal
strip which has passed.
To a lug e on the cutter is articulated a grooved guide F which passes through
a yoke G, in which it is movable and is supported by a pin g. As this pin does not
coincide with the hammer arm pin b, there will take place a relative movement of
the parts F and G, when the hammer swings, the yoke G oscillating upon its pivot.
This movement is utilised for the step by step feeding of the strip S in the
following manner:-
The strip S which is unwound from a drum S! is guided through the grooved
guide F and through a recess or slot e¹ in the cutter E. It has either lateral
projections or apertures from which project spikes or teeth, bent downwards at
right angles. The strip is placed in the grooved guide with its teeth downwards
and the grooved guide is formed accordingly with recesses for the teeth (Fig. 8).
The strip is capable of movement relatively to the guide; but the yoke G and
guide Fare provided respectively with spring pawls G and F1 adapted to engage
with the strip. The teeth of the pawls F and G₁ (Fig. 6) engage with the
recesses between the lateral projections or holes of the strip, and owing to the way
in which they are tapered, they engage only in one direction whereas in the other
direction they slide past or over the projections.
•
When the hammer descends the strip is held fast at the yoke G by the pawl G
with which it is in engagement, whereas the grooved guide F passes backwards
along the strip. But as the hammer head swinging round its pivot pin b
approaches towards the fixed yoke G, the end of the strip passing through E is
pushed forward into the path of the hammer. The feeding of the strip is
therefore caused by the movement of the hammer and of the grooved guide
relatively to the then stationary strip. In this movement the guide pawl F' slides
over the projections or teeth on the strip in order to engage with them at the.
change of stroke and to move the strip through G and G when the hammer rises.
In this manner during the upward movement of the hammer a piece of the strip is
unwound from the drum S' and fed forward by means of the pawl F, in order to
come under the hammer in the latter's downward movement, to cut off and secure
such portions of this strip. If pieces of different length have to be employed, the
feed must be adjustable. The movement of the guide F is smaller the nearer the

page_text: pivot pin g is to the pin b. The feed can therefore be made adjustable by making
the guide pin g adjustable towards the hammer pin b, but as the hammer itself must
be adjusted in a forward direction when using short pieces, that method would
require two adjustments. Therefore it is preferable to have an arrangement by
which both adjustments are obtained at the same time at one operation.
For this purpose instead of the whole part of the guide F, only a part of it is
utilised for the forward movement of the strip. There is in the groove or recess of
the guide Fa plate f which may be as shown in Figs. 6 and 7 in one piece with the
pawl F¹.
As long as in the return movement of the grooved guide F the end of
that plate is under the pawl G', the latter cannot act on the strip and so the strip
is caused by the pawl F to move back with the guide. After the left-hand edge
of the plate (Fig. 6) has passed under the teeth of the pawl G1, the strip will be
held fast. The strip therefore will be moved forward to an extent less than before.
by an amount equal to the return movement which the strip made with the guide F
before the pawl G₁ came into operation. The further the hammer A. with the
guide is moved on its arms B, the further f¹ will move relatively to the guide
pawl G' the pawl G¹ will therefore come into operation on its return so much later
and the piece of strip moved forward will be correspondingly shorter.
But apart from the adjustment of the feed, it is advisable to make the way of
the guide F ample and to utilise for the above purposes only a part of it.
Because
if the pawl G were to engage at the beginning of the down stroke of the hammer,
then each slight movement or oscillation of the hammer would cause the strip to
move forward. When the hammer rises its arm B will generally swing a little
to and fro until stopped by the controlling spring C₁. But as the pawl G¹ is
inoperative in that position of the hammer the to and fro movement of the arm B
has no influence on the forward movement of the strip.
In order to prevent the relative movement of the cutter E and hammer A
when the former strikes the anvil from having any influence on the strip, the
cutter E is guided to move tangentially to a circle having the hammer arm pivot b
as a centre, in such manner that after the cutter E descends to the anvil D the
said relative movement does not cause any movement of the grooved guide F.
With such arrangement of the guide the cutter passes the edge of the object to be
operated upon and its striking against it is avoided.
Having now particularly described and ascertained the nature of the said inven-
tion as communicated to me by my foreign correspondent, and in what manner
the same is to be performed, I declare that what I claim is :-
1. A machine for fixing metal edges or clamps to boxes and the like
characterised by a grooved guide for the fastening strip, which guide is mounted
at one end on the hammer head so as to be capable of oscillation, and is also
movable on a pin of a yoke enclosing the strip which pin is pivotted outside the
axis of rotation of the arm of the hammer so that when the hammer arm B moves
downward the guide is moved on its pin or pivot along the strip which is held fast
at the yoke by a pawl whereby the strip enters the hammer head, while a pawl on
the grooved guide causes the strip to move uniformly when the hammer arm rises,
substantially as described.
2. A modification of the machine described in Claim 1, consisting of a plate as f
placed in the guide over the strip, which plate according to the adjustment towards
or from the pawl G' causes the latter to become operative sooner or later, in order
to regulate the extent of the movement of the strip, substantially as described.
3. A modification of the machine described in which the cutter E' movable,
relatively to the hammer and connecting the grooved guide with the hammer is
guided to move tangential to a circle having the hammer arm pivot as its centre'
in order to prevent movement of the guide and of the strip when the cutter touches,
the anvil and the relative movement between the hammer and cutter takes place.
substantially as described.

page_text: 4. The combination and arrangement of parts forming a complete apparatus for
feeding cutting and securing strips of metal or clamps to the edges of boxes and
the like substantially as described and illustrated in the accompanying drawings.
Dated this 30th day of January 1897.
BOULT & WADE,
Agents for the Applicant.