Year: 1890

page_text: Date of Application, 28th Apr., 1890-Accepted, 21st June, 1890
In the accompanying drawings
Fig. 1 is an elevation of the whole apparatus, part of the centering gear, part of
the standard, and part of the band or cylinder, that is being punched, being in section
for the purpose of shewing, to better advantage, the internal parts.
Fig. 2 is a plan view of the same, the centering arm being swung on one side
for the purpose of shewing the parts beneath it.
Fig. 3 is a detail section taken on the line 1-2 of Fig. 1 and shewing the shape of
the feed cam.
Fig. 4 is a detail section on an enlarged scale of the adjustable centering pivot.
Fig. 5 is a detail section of the centering gear, specially shewing the finger of
the dog.
Fig. 6 is a detail of the punches and dies and shewing the stay for holding the
cylinder when the punches are being withdrawn from the cylinder after they have
punched the holes. This stay, to facilitate the reading of the drawing has not been
shewn in Fig. 1.
a
A is the foundation beam, that carries the bearing B, of the driving gear CC.
The driving gear is operated by pullies D D¹, and a fly-wheel E. Above the bevel
wheel Cand firmly keyed on the same axis F', is the feed cam G, the shape of which
may be best seen at Fig. 3. The shaft or axis F, passes upward through the bed-
plate H, which latter is firmly bolted down to a solid frame work or other suitable
foundation. The bed-plate H, carries a hollow standard or pedestal I, that supports
table J, upon which the punching and centering gear are placed. The shaft or
axis F, passes up the centre of the pedestal I, and operates the punching gear K. At
this point we wish it to be understood that any suitable style of punching gear may
be adopted, that shewn in the drawing is an external view of an excentrically driven
punch. The table J is provided with any number of antifriction or bearing rollers j,
the axes of which radiate from a common centre. The rollers are for the purpose of
carrying the cylinder L, that is to be punched. When the cylinder L is placed in
position on the rollers j, it is surmounted by an annulus or ring M, the periphery of
which is formed into a circular rack with teeth m. The number of teeth in the rack
must correspond with the number of sets of holes to be punched in the cylinder.
Radial arms M', are attached to the ring M, and meet at a central boss M², through
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which passes a short shaft N, the lower extremity of which is formed into an annular
groove n. Dogs O, are pivotted at o, to the outer ends of the radial arms M, and are
provided with fingers o', (see Fig. 5) which project downwards and impinge against.
the inner surface of the cylinder L. The upper ends of the dogs O, enter the annular
grooven, on the shaft. N, and are operated and governed by the vertical motion of the
shaft. These parts viz. the short shaft N, and the dogs O, with their fingers o
constitute the centering gear and form a large chuck. It will be observed that the
action of the fingers o', of the dogs O, will exert an outward pressure upon the inner
surface of the cylinder L, thus tending to distort the cylinder at the points where
the fingers of the dogs impinge upon it. To obviate this difficulty, stay studs o²
are placed on the underside of the ring M, at points outside the cylinder opposite
the impinging points of the fingers of the dogs within the cylinder. The dies p, are
placed on a block P, that is carried on an arm P¹, projecting from the pedestal I,
and take the thrust of the punches k. Mounted on the block P, is a dwarf pedestal
or standard that carries an adjustable swivel arm y, at the outer extremity of
which is placed the adjustable swivel center m which is shewn in enlarged detail
at Fig. 4. It will be observed that the swivel pin m², is spherical headed, the
radius of the sphere being equal to the length of the pin. The axis of the swivel
arm g, is preferably so constructed that when the arm is swung in, the swivel
pin m², shall stop dead over the centre of the table. There are many ways of
effecting this object, and we do not wish to confine ourselves to any particular
mode. The arm 7, is adjustable vertically upon its axis and is secured at any desired
height by means of a set screw ', fixing the ring 2, upon which the arm
and turns freely. When in the central position the arm 7 is fixed by a set screw q³.
The arm may moreover be so constructed as to be adjustable longitudinally, so as
to afford facilities for centering any cylinder, the diameter of which is within certain
limits.
bears
· An intermittent rotary motion is imparted to the cylinder L under operation, by
means of a pawl R (see particularly Fig. 2). This pawl R is carried by one arm
of a bell crank lever, working on a long vertical axis r. The lower army of the bell
crank lever impinges against the periphery of the cam G. The pawl R, is kept in
contact with the teeth m of the rack by the action of the spring, and the arm g of
the bell crank lever is kept in contact with the periphery of the cam G, by the action
of the spring g (see Fig. 2). For taking the thrust of the pawl while the cylinder is
being rotated, an antifriction roller S on a vertical axis projecting from the table J, is
placed in a position outside the cylinder L, at a point (see Fig. 2) where it will be
inost effective for the purpose.
A spring T, adjustable by the screw t, is placed in contact with the cylinder L on
the side opposite to the antifriction roller S, and serves to further support and guide
the cylinder while it is being rotated. The vertical stay V, (shewn particularly in
Figs. 2 & 6) is secured to the table J and serves to hold the cylinder I while the
punches are being withdrawn from the holes.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1. In machine tools for punching cylindrical surfaces the adjustable arm provided,
at its outer extremity with any adjustable pivot or swivel pin m² for the purpose of
allowing a certain amount of play to the chuck arrangement or centering appliances
as herein set forth.
2. In machine tools for punching cylindrical surfaces the chuck arrangement or
appliances consisting of a ring M, radial arms M', the dogs O, and short central
shaft N which operates the dogs O, for the purpose of centering the cylinder to be
punched as herein specified.
.1
3. In machine tools for punching cylindrical surfaces the feed appliances consisting

page_text: of the cam G, the bell crank lever g-r¹, and the pawl R in combination with the
ring M and circular rack m for the purpose of conveying an intermittent rotary
motion to the cylinder under treatment as herein described.
4. In machine tools for punching cylindrical surfaces, the general arrangement,
construction and combination of parts, as shewn in the accompanying drawings, and
as herein specified.
Dated this 12th day of March 1890.
GEO. J. HOSKINS.
C. H. HOSKINS.
W. P. Thompson & Boult,
Agents for the Applicants.
GEO. J. HOSKINS.
C. H. HOSKINS.
W. P. Thompson & Boult,
Agents for the Applicants.