Improvements in Skiving Machines.
Year: 1898

page_text: Date of Application, 2nd Aug., 1898-Accepted, 10th Dec., 1898
COMPLETE SPECIFICATION.
Improvements in Skiving Machines.
I, CHARLES HENRY BAYLEY, of No. 111, Lincoln Street, in the City of Boston,
County of Suffolk, Commonwealth of Massachusetts, and United States of
America, Manufacturer, do hereby declare, the nature of this invention, and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement;-
This invention has relation to that kind or class of machines for skiving leather
which are equipped with a rotary feed roll, a rotary cutter, and a feed disk
capable of rotation, in conjunction with means adapted to cooperate with the
parts specified in order to render them efficient in the performance of their
designed functions.
It is the object of the present invention to provide improved means for adjust-
ing the knife-carrying frame or bracket so as to bring the knife in a position
parallel with the feed-roll, or tilt or incline it to any desired degree with refer-
ence to the surface of the feed-roll, in order to vary the line of skiving, cut of
the knife accordingly. In carrying out this purpose of the invention, I have kept
in view the facts that it is very difficult for operators, generally, as machines here-
tofore have been constructed, to secure that nice or exact degree of adjustment of
the knife that is essential to perfect work, and to accomplish such adjustment
readily and quickly, so as to save time and tax.on the patience of the operator.
Again, the invention consists of improvements, whereby the grinder for the
knife may be adjusted co-ordinately with the knife itself, so that the grinder
may always retain the same relative position with respect to the knife.
It is, furthermore, the object of this invention to provide means for guarding
or protecting certain gearing in the machine, so that the hair on the head of
the operator, her or his hand or fingers or clothing, or any foreign substance
may not be readily caught thereby or therein.
The invention consists of the improvements hereinafter set forth and pointed
out, having regard to the objects of the improvements herein before. recited...
Reference is to be had to the annexed drawings and to the letters marked
thereon, forming a part of this specification, the same letters designating the
same parts or features, as the case may be, wherever they occur.
Of the drawings-
Figure 1 is a front elevation of a skiving machine embodying my invention.
Fig. 2 is an end elevation of the same.
Fig. 3 is a horizontal sectional view through certain of the parts, showing how
the varying tilts of the knife are effected.
Fig. 4 is a vertical sectional view showing the manner of adjusting the knife
vertically.
Fig. 5 is a similar view showing the manner of adjusting the grinder ver-
tically.
Fig. 6 is a front view of the adjustable gear guard detached.
In the drawings-
a designates the bed-plate or base of the machine which is supported, upon

page_text: suitable legs. b is the driving-shaft supported in suitable bearings connected
with certain parts of the frame, and transmitting motion through suitable gear-
ing and the shaft c to the feed-roll shaft d. e is the feed-roll secured upon the
shaft d. The bearings for the feed-roll shaft are supported upon a plate or
bar f, pivoted at g upon the bed a, and at its front end is adjustable horizontally
through the medium of an adjusting thumb-screw h operating in bearings of a
lug projecting from the bed-plate.
jis the feed disk secured to the lower end of its shaft which is held down
with springs or yielding pressure.
k is the cutting disk or knife, secured at its lower end upon a rotary shaft 4,
the latter being provided at its upper end with a bevel pinion m which meshes
with a bevel gear n on the driving shaft b. The cutter shaft is supported in
suitable bearings connected with the forward end of the knife-frame or bracket o,
which latter is pivoted at p upon the sliding frame or block q supported on suit-
able ways connected with a stationary part of the frame r, all as is most clearly
shown in Fig. 3. The frame is provided with a slots through which the
shank of a thumb-screw t passes, said thumb-screw being tapped into the block q
so as to hold the latter firmly in place when once it is adjusted in desired position.
The frame or bracket o is provided with a slot u toward its rear end, which
slot is made circular and concentric with the pivotal axis p, and the rear end of
the frame o is also made in the form of a segment of a worm gear, provided with
worm-teeth v, as shown in Fig. 1. The shank of a thumb-screw w passes through
the slot in the bracket or frame o and is tapped into the block or sliding
frame q.
Under this construction it will be seen that the knife frame or bracket o may,
after the thumb-screw w is loosened, be tipped so as to incline the knife k to any
desired position in order to vary the angle of the skiving cut made upon the
leather passing over the feed-roll e and under the feed disk and operated upon by
the knife in a well-known way.
In order to secure the adjustment of the knife with great nicety, I have pro-
vided a worm or screw arranged to be supported in the rear angle end of the
block and to engage the worm segment or toothed rear end v of the frame o.
With this construction it will be seen that upon loosening the thumb-screw w
the bracket o will not be displaced, but will remain in position until the adjust-
ing screw or worm is operated, which may be taken hold of by the thumb and
finger of the operator on the milled head y, and after the bracket is adjusted so
as to adjust the inclination of the knife to the exact line desired, the thumb-
screw will be turned up and the bracket held in position.
To adjust the knife to and fro on a line substantially parallel with the axis of
the driving shaft and feed-disk shaft, it will be necessary to loosen the thumb-
screw t, and move the frames supporting the bracket to position, resetting the
said thumb-screw after the adjustment is made.
By forming the end of the bracket or frame o as a segment of a worm gear,
and providing it of course with worm teeth, and by making a bearing for the
worm which engages the segment of the bracket o in an angular forwardly pro-
jecting part z of the block or sliding frame, I am enabled to economize space and
get the adjusting means for the knife carrying frame or bracket in the most
convenient place and position for the operator to act upon them; and besides this
an entirely efficient means is provided for securing the angular adjustment of
the knife with the utmost nicety, and holding the bracket in place after adjust-
ment.
a designates the grinder or grinding disk secured upon the lower end of its
shaft 6 supported in suitable bearings in a bracket c¹, which extends upwardly
back of or to the rear of the means for supporting the cutting knife and parts
thereof extend under the last mentioned means and upward, as at d¹, so as to
be secured, as shown in Fig. 1, to the knife carrying frame o.

page_text: By this means it will be seen that the grinder a¹, when once adjusted to a
plane corresponding to that of the knife, will be adjusted co-ordinate with it
when the knife carrying frame is adjusted, since the frame carrying the
grinder a is adapted to and can be made substantially one with the bracket or
frame o. This adjustment of the grinder frame with the knife carrying frame
is also an important feature of the invention.
It will be noted that the grinder frame is pivoted upon the screw stud p, and
that to the rear of the same said grinder carrying frame is provided with a slote',
through which passes the shank of a set screw f¹ tapped into the knife carrying
frame o, so in addition to the adjustments of the grinder before described, it may
be adjusted in inclined position, independent of the knife, through the medium
of the set-screw f¹ and the slot el in the grinder bracket.
g designates a gear-guard or hood, made in circular form, and adapted to
extend over the teeth of the gear #, and in an extended part 2 to also project
outward in front of the gear m. The said guard g' is provided with a supporting
shank through which is formed a slot for the reception of the shank of a
set-screw adapted to be tapped into the stationary part of the frame so as
to hold it in position and allow it to be adjusted longitudinally of the driving
shaft, when the gear is adjusted, as it sometimes is, upon the driving shaft.
By means of the guard g¹ all danger of any accident to the operator, from his
or her fingers or her hair being caught in the gears or any other accident happen-
ing to the operator, is avoided; and besides this, the gears are kept free from
being clogged by dust, dirt, or other foreign matter; and by rendering the guard
or gear cover adjustable upon the driving shaft provision is made for keeping it
in position relatively to the gear, so as to best subserve its purpose as a guard
for the said gears. This feature is important in this machine and others of a
similar nature.
When it is desired to employ the grinder in sharpening the knife, the belt-
tightening means are adjusted so as to turn the grinder, and the thumb>
screw on top of the grinder shaft b is turned down, so as to bring the grinder
into grinding. contact with the knife, and, after the knife is ground, the grinder
will be raised and the belt tightening means adjusted so as to slacken the belts
which operate the grinder, and the use of the machine may be proceeded with.
It is to be particularly noted that the grinder is placed in the rear of the skiv-
ing mechanism, and entirely out of the way of the latter and of the material as
it is being operated upon. At the same time the grinding means is so located
and is of such an accessible nature that it may be readily and quickly brought
into position when desired.
It will be understood that when the cutter frame is adjusted about the pin p
the gears m and n will be adjusted on their respective shafts, by hand, through
the medium of the usual set or binding screws by which the gears are fixed
on their shafts, in order to keep the said gears in proper mesh or relationship.
18 is a shaft provided on its upper end with a milled head 3, said shaft having
bearings in a relatively fixed part of the machine and constructed so that it
may be rotated but cannot move longitudinally (see Fig. 4). At a point near
the lower end of the shaft the latter is screw-threaded as at and has a screw-
threaded connection with the knife-carrying frame so that the latter can be
adjusted up or down.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. A machine for skiving leather embodying in its construction a pivoted knife-
carrier or bracket and its support, the knife-carrying bracket being constructed
at its rear end as a segment of a worm gear, and a thumb-screw or worm having
bearings in the bracket support and adapted to engage the said segmental worm

page_text: on the bracket, whereby, by turning the screw, the bracket may be adjusted to
adjust the tilt or inclination of the knife, substantially as specified.
2. The combination, with the pivoted knife-carrier or bracket, of the thumb-
screw at the rear end of the bracket to engage the same for tilting or adjusting
the said bracket and the means carried thereby, substantially as specified.
3. A machine for skiving leather in which the pivoted knife bracket or frame
is adjustable through the medium of a screw, the combination with the said
bracket or frame of a frame connected therewith provided with a rotary grinder
adjustable co-ordinately with the knife-bracket whereby the grinder may at all
times be kept in proper relative position with respect to the knife, substantially
as described.
4. The combination, with the pivoted and adjustable knife bracket or frame,
of the grinder-carrying frame connected with the knife bracket and supporting
the grinder in position to have it brought into operative position on the knife,
substantially as described.
5. The combination, with the adjustable knife-shaft and its gear and an adjust-
able gear for engaging and driving the knife-shaft, of an adjustable gear cover
or hood to protect the said gears, substantially as described.
Dated this 2nd day of August 1898.
BOULT & WADE,
Agents for the Applicant.
BOULT & WADE,
Agents for the Applicant.