alotion of the cams
Year: 1887

page_text: Date of Application, 17th May, 1887.
Specification Accepted, 17th June, 1887,
[Communicated from abroad by THE SHOE LASTING MACHINE COMPANY, of the
City, County, and State of New York, United States of America.]
I, JAMES YATE JOHNSON of 47 Lincolns Inn Fields in the County of Middlesex,
Gentleman 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 has for its object certain improvements in the machinery for lasting
the uppers of boots and shoes described in the Specification to Letters Patent dated
March 16th 1886 No. 3706 and has reference more particularly to devices for actuating
the lasting wipers or side wipers as they are sometimes called.
In the machinery referred to, two sets of side wipers are actuated in such manner
that, while operated simultaneously from a single power mechanism they may
nevertheless act independently of one another upon the two sides of the last, and this
result is obtained by the employment, among other things of what may be considered
a yielding connection between the power mechanism and the actuating devices.
The object of the present Invention is to obtain this yielding connection without
the employment of springs or the like, and in such manner that there may be a
positive engagement between the motor shaft and the devices actuated thereby. It
has also for its object to dispense with the use of the cord and pulleys as equalizing
devices in advancing the wipers, and to substitute therefor what is considered to be a
more efficient and durable instrumentality for the purpose.
The nature of the present Invention and the manner in which the same may be
carried into effect will be clearly understood by the following description with
reference to the accompanying drawings of which :-
Figure 1 is a plan of so much of a lasting machine as is necessary to illustrate the
Invention.
15
and alotion
of the cams

page_text: Figure 3 is a side elevation of a portion of the upper part of the frame or supporting
table and one set of wipers thereon.
For the purpose of illustrating the Invention there is illustrated on the drawings
only four in each set of the simultaneously actuated, but independently operating
side wipers. This being the number generally used, although any other desired number
may be employed.
18 represents the longitudinal slides which by means of half nuts engaging screw
threads of varying pitches are moved longitudinally of the last. P are the blocks
pivoted to said slides O, and R are the wiper slides mounted in ways in said blocks.
These parts are arranged and combined together in the same way as are the like parts
described in the Specification hereinbefore referred to. The wipers which are attached
to the inner ends of the wiper slides are not shewn they may be of any suitable
construction.
The frame of the machine is lettered A.
on the sides by the two sets of wipers, and
the last.
The central opening in its top is bordered
between them as usual is to be supported
In lieu of the cords and pulleys formerly employed to advance the wiper slides Ra
system of connecting rods and equalizing levers are employed. There are two pairs
of wiper slides in each set. Each slide has pinned or pivotted to it a connecting rod a
and the two connecting rods of each pair of slides are pivoted to opposite ends of
a lever b. The two levers b in turn are pivoted at points midway between their two
ends to opposite ends of a third lever c which is pivoted at its centre to some suitable
support capable of moving inwardly or towards the last. The support in this instance
is the upper end of a vertical lever d pivoted at e to the frame of the machine. It will
be understood that this lever d is typical of any of the numerous devices well known
If
to those skilled in the art which may be used to advance and retract the lover c.
the lower end of the lever d be pulled outwardly its upper end and consequently the
lever. c move inwardly or towards the last. The effect of this movement is to advance
all of the wiper slides simultaneously. At the same time it will be noted that, of the
two wiper slides of each pair, if one brings up against the last sooner than the other,
the latter by reason of its connection with the lever can still advance, it will also be
noted that of the two pairs of slides, the one pair as a whole can advance further than
the other owing to the connection of their levers to the common pivoted lever c.
Thus by this system of connecting rods and equalizing levers, the slides which
constitute a set are advanced simultaneously, and yet may act independently, each
advancing any distance required by the necessity of the work or the shape of that
portion of the last opposite which it may be located.
It remains to describe the means employed for actuating the two opposite sets of
wiper slides by a single power mechanisin, without preventing the movement of each
set, independent of the other set, which may be required by the shape of the sides of
the last upon which they operate respectively.
The two are not
It is not indispensable that the means just referred to should be employed in
conjunction with the equalizing system herein before described.
interdependent. But we prefer to use them in combination.
Each vertical lever d is operated by a cam f fast on the motor shaft g, a pin or
roller stud on the tail of the lever entering the groove in the cam. These grooves are
of such shape, that, when the shaft is revolved, the cams will cause the two levers to
simultaneously advance or retract the two sets of wiper slides, according to the
direction in which the shaft is rotated. The shaft may derive its movement from any
suitable source, as shewn it is derived from a driving shaft h through the intermediary
of gearing ij. Thus far there is between the two sets of wipers and the power
mechanism, or the shaft g, no yielding connection, or in other words no connection
which will permit the rotation of the shaft to continue after either one of the sets of
wiper slides comes to rest or can advance no further.
To make provision for this, the shaft g is so arranged and mounted in its bearings
that it may have some end play, that is to say, be capable of motion in the direction
of its length. No great range of such motion is required, in practice it is found that

page_text: from one to two inches is sufficient. One of the gears ij (in this instance() is made
sufficiently broader than the other, to permit of this movement without throwing the
two gears out of engagement.
The result of this arrangement is as follows:
Suppose for instance that the shaft is rotating in a direction to advance both sets of
wipers and that one set, for example the right hand set in Figure 2 brings up against
the last before the other set. The lever d of the right hand set then becomes
immovable and as the shaft continues to revolve the said lever by its action upon the
cam which it engages will cause the shaft to move to the left, with the effect of
enhancing the advancing movement of the lever and wipers on that side. Thus while
each lever positively engages the power mechanism common to both of them, that
mechanism can still move to actuate one lever although the other may have come
to rest.
Having now particularly described and ascertained the nature of this Invention and
in what manner the same is to be performed I declare that what I claim is :-
First. The combination with the wiper slides of connecting rods and equalizing
levers, arranged and operating to advance all of the wiper slides of the set simultaneously
and at the same time to permit individual independence of movement to said slides
substantially as and for the purposes hereinbefore set forth.
Second. The combination with the wiper slides of the connecting rods a, levers b c
and the lever d substantially as and for the purposes hereinbefore set forth.
Third. The combination of two opposed sets of wiper slides, mechanism for advancing
each set, and an actuating shaft for said mechanism, capable of endwise movement in
its bearings substantially as and for the purposes hereinbefore set forth.
Fourth. The combination of the two opposed sets of wiper slides, the two systems of
connecting rods and equalizing levers, one for each set, a motor shaft, common to
both systems, capable of endwise movement in its bearings, and means substantially
as described whereby each system is connected to and actuated by said shaft, the
combination being and acting substantially as herein before set forth.
Dated this 17th day of May 1887