Improvements in or relating to Tool Grinding Machines.
Year: 1899

page_text: Date of Application, 11th Nov., 1899
Complete Specification Left, 4th Aug., 1900-Accepted, 22nd Sept., 1930
PROVISIONAL SPECIFICATION.
Improvements in or relating to Tool Grinding Machines.
We, CHARLES HENRY DALE and FREDERICK JAMES DALE, trading as H. & F.
Dale, 23, Oxford Street, Leicester, Engineers, do hereby declare the nature of
this invention to be as follows:-
This invention relates to tool holding mechanism for tool grinding machines
and is chiefly, though not exclusively, intended for use in connection with the
curved or seguentai cutters of boot heel trimming or paring machines.
The object of the invention is to provide simple and efficient tool holding
mechanism having the fullest scope of adjustability for presenting the cutter to
the grinding disc.
The tool holding mechanism constructed in accordance with this invention
comprises a pair of suitable jaws or a clamping device adapted to be expanded
or contracted (according to the type of cutter being treated) to grip or hold
the cutter while it is being presented to the grinding disc.
The jaws or clamping device may be provided with a groove or grooves or a
face agreeing in contour with the cutter to be ground and also with an adjustable
stop against which the end or edge of each cutter is placed so as to ensure all
the cutters receiving similar treatment and being of the same length when they
are removed.
The jaws or clamping device may be attached to or form an integral part of a
carrier bored so as to pass over and be secured on a sliding bar having a horizontal
reciprocating motion imparted to it for the purpose of moving the cutter to and
fro across the acting face of the grinding disc.
The said sliding bar may be actuated by means of a slotted block fixed pre-
ferably at one end thereof and deriving motion from a crank pin on a disc or
cam (or their equivalent) the shaft of which is driven by worm gearing operated
by preferably a grooved pulley and band from the main or countershaft of the
machine.
The tool carrier in its reciprocation passes to and fro over a former" the
contour of which is coincident with that of the edge to be imparted to the cutter.
The tool carrier and its actualing mechanism may be adjusted bodily relatively
to the acting face of the grinding disc, on a screwed spindle with lock and
adjusting nuts, the angle of the said spindle being preferably parallel with a
radial line drawn from the centre of the grinding disc to that point on the
periphery of the latter upon which the cutting edge is being (or to be) ground.
The said former may be removed and substituted by another whose surface
agrees with that of the cutting edge to be produced upon the cutter and the
sliding bar may be counterweighted or spring governed to maintain the tool
carrier in contact with the "former" and the cutter in operative position as
regards the grinding disc.

page_text: Improvements in or relating to Tool Grinding Machines.
We, CHARLES HENRY DALE and FREDERICK JAMES DALE, trading as H. & F.
Dale, 23, Oxford Street, Leicester, Engineers, do hereby declare the nature of
bis invention and in what manner the same is to be performed to be particu-
lurly described and ascertained in and by the following statement:—
This invention relates to tool holding mechanism for tool grinding machines
and is chiefly, though not exclusively, intended for use in connection with
the curved or segmental cutters of boot heel trimming or paring machines.
The object of the invention is to provide simple and efficient tool holding
mechanism having the fullest scope of adjustability for presenting the cutter
to the grinding disc.
The invention will be understood from the following further description in
reference to the accompanying drawings, in which
Figure 1 is a side elevation of a machine constructed in accordance with
this invention.
Figure 2 is a plan of the same.
Figure 3 is a section on the line X X of Figure 2.
Figure 4 is an elevation of the tool holder and former taken on the line Z Z
of Figure 1.
The tool holding mechanism comprised within this invention consists of a
pair of jaws or clamping plates A. A each provided on its inner face with a
groove A of a shape coincident with that of the side of the knife or cutter B
which is fitted therein preparatory to being presented to the grinding disc S.
The said jaws are contractible and expausible for the purpose of gripping the
cutter when placed between or to allow of its removal after grinding
For these purposes two screws A³ A Figures 1 and 4 pass through opposite
extremities of the jaws and each is furnished with a wing nut A³ for tightoning
the jaws against the cutter or for releasing them.
C is an adjustable rest or stop plate upon which the lower edge of the cutter
rests during the grinding operation.
This stop when kept in the same position, ensures that all cutters subsequonily
placed between the jaws will receive similar treatment and be of uniform length
when ground.
The said stop plate is adjustable for varying lengths of cutters for which pur-
pose its boss C Figure 1 is passed over a vertically screw threaded spindle C
and located between two nuts C³ C' thereon.
The lower end of the said spindle is fixed in a carrier D to which also the
jaw A is attached at its lower end or forms an integral part thereof, the other
jaw A being loose on the screws A³ A' to admit of the jaws being opened and
closed.
The boss D Fig. 2 of the said carrier is placed over a sliding bar E and fixed
thereon by a set screw E so as to partake of its movemont.
The sliding bar E has bearings Fi F³ in a frame F and has a horizontal recipro-
cating motion imparted to it, theroby similarly actuating the carrier D and

page_text: jaws AA and moving the cutter 1 to and fro across the periphery or acting
face of the grinding disc S.
The movement of the bar E is obtained through the medium of a block G,
Figures 1, 2 and 3, furnished on one face with two luge G¹ G mounted loosely
on the sliding bur E and on its opposite face with a groove or slot C³ in which
is located a crank pin H' arranged on a rotating disc H fixed on a short spindle П³
passing through a sleeve F3 forming part of the framing F.
The said spindle has on its end a worm wheel J gearing with a worm J¹ on the
end of another short spindle K having a bearing in the framing and furnished on
the opposite end with a grooved pulley K' driven by a band Kª proceeding from
a similar pulley L' on a countershaft L connected to the pedestal or standard
of the machine.
There is also on the end of the sliding bar E, a counterweight N, for which if
desired a spring may be substituted, to maintain a toc 1 on the tool carrier D
in contact with a former M and the cutter B in operative position against the
grinding disc S.
The lug N' of the counterweight is fixed by a screw Ne between the lugs G¹ G³
of the block G and any movement of the latter due to the action of the crank
pin is communicated to the bar E by one of the said lugs bearing against the
counterweight lug N' fixed rigidly thereto.
The tool carrier is furnished with a downwardly projecting toe D³ resting on
a former M Figures 1 and 4 the surface of which is coincident with that of the
edge B to be imparted to the cutter B.
This former is removable and may be replaced by another having a differently
shaped surface corresponding to the cutter edge to be produced, for which pur-
pose it is provided with an angular extension M slotted to fit over a screw ³
projecting from the framing F, a wing nut M³ on the screw serves to tighten the
former in position or to release it.
The tool carrier D and the herein before described actuating mechanism may be
adjusted baily relatively to the acting face of the grinding disc for varying
sizes of grinding discs and to compensate for wear of the latter.
This adjustment is effected by mounting the framing (which carries the tool
carrier and its actuating mechanism) upon a screwed spindle O, arranged at an
angle, parallel with a radial line drawn from the centre of the grinding disc S
to the point S on the acting face of the latter upon which the cutting edge is
being (or to be) ground.
The said spindle is provided with nuts 0 0 under and above the boss of the
framing to permit of the latter being raised or lowered as required and fixed
in position.
A guide rod P arranged parallel with the screwed spindle is also employed
to prevent any lateral or rotary movement of the framing during adjustment.
Both the spindle O and guide rod 1' are attached to a plate bolted to the
bed plate R.
No mention is made or is considered necessary of any part of the grinding
machine, other than the grinding disc and the tool holding mechanism herein-
before described, as these may be of any suitable construction.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1. In tool holding mechanism for grinding machines the combination of two
jaws, a carrier for same, a sliding bar connected to the latter and means for
actuating the said bar for the purpose described.
2. In tool holding mechanism for grinding machines the combination of two
cutter holding jaws, an adjustable stop or rest for the cutter, a carrier for the
said jaws, a sliding bar for the said carrier, and means for actuating the said
bar for the purpose described.

page_text: 3. In tool holding mechanism for grinding machines the combination of two
cutter holding jaws, a carrier for the latter, a stop or rest for the cutter mounted
upon a screwed spindle attached to the carrier and nuts on the said spindle to
permit of the adjustment of the said stop or rest for the purpose described.
4. In tool holding mechanism for grinding machines the combination of two
cutter holding jaws, an adjustable rest for the cutter, a carrier therefor, a sliding
bar for the latter, a crank pin or equivalent and means interposed between it and
the sliding bar to actuate the latter for the purpose described.
5. In tool holding mechanism for grinding machines the combination of
two cutter holding jaws, a carrier therefor, a sliding bar, grooved block thereon,
crank pin and disc for actuating the latter and sliding bar, and means for
actuating the said disc for the purpose described.
6. In tool holding mechanism for grinding machines the combination of two
jaws, carrier therefor, a sliding bar, a shaft and means interposed between it and
the sliding bar to actuate the latter for the purpose described
7. In tool holding mechanism for grinding machines the combination of two
jaws, a carrier therefor, a sliding bar, a shaft and worm gearing and means
interposed between the latter and the sliding bar to actuate it for the purpose
described.
8. In tool holding mechanism for grinding machines the combination of two
jaws, a carrier therefor, a sliding bar, grooved block thereon, disc and crank pin
for actuating the latter, and worm gearing and driven shaft for actuating the
said disc and pin in the manner and for the purpose described.
9. In tool holding mechanism for grinding machines the combination of two
jaws, a carrier therefor, means for reciprocating the latter and a former over
which the said carrier travels for the purpose described.
10. In tool holding mechanism for grinding machines the combination of two
jaws, a carrier therefor, means for reciprocating the latter, a former over which
the carrier travels, and means to perimit of the former being detached per se
and substituted by another of a different contour for the purpose described.
11. In tool holding mechanism for grinding machines the combination of two
jaws, a carrier for same, a sliding bar and actuating mechanism, a supporting
frame therefor and means for adjusting the said frame relatively to the grinding
dise for the purpose described,
12. In tool holding mechanism for grinding machines the combination with
a framing, of two jaws, a carrier therefor, a sliding bar and its actuating mech-
anism supported by the said framing, a screwed rod arranged at an angle parallel
to a radial line drawn from the centre of the grinding disc to the point on the
neting face of the latter upon which the cutter is being (or to be) ground, and
nuts on the said screwed rod to permit of the bodily adjustment of the said
framing and its attachments for the purpose described.
13. The improved teol holding mechanism for grinding machines constructed,
arranged and operating substantially in the manner and as and for the purpose
described and illustrated in the accompanying drawings.
1000
CHARLES HENRY DALE.
FREDERICK JAMES DALE.
Boult, Wade & Kilburn,
Agents for the Applicants.