Improvements in Machines for the Automatic Sharpening of Saws and other Tools.
Year: 1887

page_text: Date of Application, 13th June. 1887
Complete Left, 13th Mar., 1888
Complete Accepted, 1st June, 1888
Improvements in Machines for the Automatic Sharpening of Saws
and other Tools.
I, CHRISTIAN FRIEDRICH HAX, of Kempten, in the Kingdom of Bavaria, Engineer,
do hereby declare the nature of this invention to be as follows:-
This invention relates to machines for sharpening of saws and other tools and
consists in improvements hereinafter described having for their principal purpose to
form a machine for the automatic sharpening of saws by means of a file.
The machine consists of a main bed plate or frame carrying the sharpening
machinery and of a clamping holder for the saw adapted to be fixed to said frame so
that the teeth of the saw may be brought one by one under the operation of the file
or other sharpener, the latter being caused to act at a desired angle to the plane of the
saw. The file is given, by a crank and connecting link, a to and fro motion in the
direction of its length. Suitable means are also employed by which the said file may
be thrown outward or away from the saw for a given time after a given number of
strokes have been made thereby.-This interval is occupied by causing the saw whether
it be straight or circular, to move forward in order to bring a second. tooth under
the operation of the file.
This process is continued, until all the teeth have been sharpened.
The pressure on the file may be regulated by springs and the periodical out throw
of the latter and the forward movement of the saw may be performed in any convenient
manner by suitable gear from the main shaft.
1007
HERBERT & Co.,
Agents to Applicant.

page_text: Improvements in Machines for the Automatic Sharpening of Saws
and other Tools.
I CHRISTIAN FRIEDRICH HAX of Kempten, in the Kingdom of Bavaria Engineer
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 relates to machines for sharpening saws and other tools and consists
in improvements hereinafter described having for their principal purpose to form a
machine for the automatic sharpening of saws by means of a file.
Referring to the accompanying drawings Fig. 1 is a plan and the remainder of the
figures are details and modifications of the improved machine.
a is a bed plate on which the various parts of the machine are mounted. is the
plate or frame for holding and moving the saws said frame having an angle plate by
which it is secured to the bed plate a by means of screws A a passing through slots in
the said angle plate.
The edge of the plate a is slanted from the middle towards the left Band the
right Cc to allow the frame & with the saw fixed therein to be placed in
any convenient
inclined position. is a support in which the prismatic bar d (Fig. 1. cross
section A B) is moved to and fro by means of the pulley m the axle i the crank disc g
and the coupling rod f.
The front end of the bar d is of oblong cross section and is provided with a slightly
inclined slit in which moves the clamping head S for receiving and holding the tang
of the file t.
This head is shown in Fig. XII. in longitudinal section, in Fig. XIII. in side view
in Fig. XIV. in under plan view and in Fig. XV. in cross section. The rear tongue S¹
of the clamping head is revolvably lodged on the pivot S in the prism d. The
tongue S is bevelled below and has a nose (see Fig. XII) which is pressed upward by
the spring bearing thereon and lying in a recess in the prism d. e is a plate
(Figs. XIII. XIV. XV.) having slots through which pass pins fixed in the body d
so that the said plate is displaceable upon the prism d, this plate by its displacement
lifts the clamping head S by abutment on its lower bevelled surface. The spring d
subsequently depresses again the head S after rearward displacement of the plate e.
The displacement of the plate e is effected by the lever which is revolvable about
the pin fixed to the prism and connected by means of screw a with a slot in the
plate the said lever abutting during the forward movement of the file against pin u
and thereby shifting the plate forward, and lifting the clamping head so that the file
is lifted during the receding thereof and therefore does not touch the saw.
After receding the plate is shifted back again by the abutment of the lever against
the pin so that the file is free to be lowered again by the pressure of the spring d¹,
the spring serves at the same time to produce the necessary pressure of the file when
advancing.
The clamping head is inclined so that the file is also lifted laterally upward from the
edge of the tooth of the saw (Fig. XV).
The pulley m integral with the tooth wheel p. feathered on the shaft i moves the
dise y setting the file in motion. is a loose pulley. The pulley K moves loosely on
the shaft and is integral with the tooth wheel n gearing into the tooth wheel o
(Fig. 1). The tooth wheel p gears with the tooth wheel 7 and thereby actuates the
shalt 22 and the bevelled wheel 1a, the toothed wheel o moves the shaft 21 with

page_text: bevelled wheel 1c. The axles 21 and 22 are journalled in the angle bearing 2 c
(Figs. III and V). The pulleys m and k have separate functions.
The former pulley as mentioned above moves the file to and fro and after this has
ceased the latter pulley opens the clamping head subsequently the saw being advanced.
In the approximate proportion of the gear shown in the drawing the pulley m
makes 4 revolutions (therefore the file 4 strokes) before by the hereafter described
mechanism the strap is shifted onto the pulley k. The bevelled wheel 1a sets the
bevelled wheel 1 d and shaft 3 a in revolution. On the shaft 3 a is secured the disc 4 a
provided with a crank pin 8. On the rod V of the lever system V V₁ with spring 5
which moves the belt lever or fork an abutment is arranged against which the pin 8 a
abuts at the desired moment displacing the rod V and thereby the disengaging fork
shifting the belt onto the pulley k.
The drawing shows also a cam disc 6 a which has the same function relative to the
rod 5 as the pin 8* on V the spiral spring 5ª causing the displacement of the lever
system. Either the disc 4ª with the rod V or the disc 6a with rod 5 may be arranged
alone for effecting the displacement of the belt fork..
When the belt has been transferred as described onto the pulley & the movement
of the pulley m and thereby also of the file ceases, and the shaft 3.6 is set in revolution
by means of tooth wheel no and bevelled 1e 1 (Figs. III. and VI). The pro-
portions of the gear are here likewise so chosen that after about 5 revolutions of the
pulley the belt is again shifted back on the first pulley m. This is effected by the
dise 46 with pin or by the cam disc 66 in the same manner as above described with
regard to 4 and 6.
Before the shifting back of the belt is however effected the shaft 36 causes the
opening and closing of the clamping cheeks yz and the transporting of the saw § 8
Fig. X for the breadth of one or more teeth.
The opening and closing of the clamping cheeks yz (Figs. IX. and X.) is caused
by the cam 6c which displaces the lever system 7 Fig. VI as soon as the movement of
the file has ceased. The first lever has at its end situated near the shaft 36 a pin
against which the cam 6 abuts so as to displace the lever; the parts 7 g 7d and 7 a
are connected with said lever in the manner shown in the drawing.
Figs. VI. and XVI. plan and Fig. XVII. elevation are simultaneously moved.
Thereby the bolt 7 opens the clamping cheek y, a slanted portion 7k of said bolt
sliding along the inclined channel 7. The clamping cheeky remains open till the
saw is displaced, the cam 6a then releases the bolt 7 which is then shifted back by its
spiral spring into the original position. The displacement of the saw is effected by the
disc 4 c.
To enable the frame b to support circular saws Ss of different diameters a slide 15
(Figs. VIII. IX. and X.) consisting of parts 9, 10, 11, 12, 13, is guided in the
frame b.
14 is a nut engaging on the screw spindle 24 which serves to move the slide 15 up
and down in the guides to according to the size of the saw. The cone 10 allows the
circular saws to be clamped exactly in the centre with varying width of hole. It is
situated on the screw bolt of the slide which is provided with a longitudinal groove
a nut 12 and a washer 11 having a feather engaging in the said groove are placed on
the bolt 9 behind the cone 10.
The lever 18 is adjustable on a slot in the horizontal plate ¹ Fig. (VII. and VII a)
and is set according to the size of the saw.
This lever has a pawl 16 provided with a spring 17. 19 and 20 are adjustable pins
fixed in desired positions in the upper slot in the plate b to limit the movement of the
lever. 18 according to the size of the saw and width of the teeth.
Fig VIII. shows the rear side of the clamping plate b¹ that is to say the device
for displacing the saw blades and Fig. X. is an elevational section along line L M.-
8 is a bolt having an abutment and shown in Figs. VI. VIII. and VIII a in detail.
The abutment, and therefore the bolt is moved by the disc 4c (Fig. VI). To the
said bolt 8 is hinged the rod 23. This rod is connected with lever 18 and pin 16.
Fig. VIII.

page_text: When the saw blade is displaced in the described manner and clamped fast again
the disc 4 causes the belt to be shifted to the pulley m, the movement of the
axle 36 ceases and that of 3 a i.e. of the file commences again.
The slide 15 guided in the frame carries the front or clamping plate b
(Figs. VII. and VIII.) which encloses the mechanism for clamping the circular and
straight saw blades.
For the clamping of the straight blades the mechanism is modified as shown in
cross section and elevation by Fig. IX.
Here the cone 10 is replaced by the angle bar 26 and on the latter a bar 25 of
Tiron is arranged on which the saw is displaced.
Beside the angle bar 26 and T iron 25 another clamping hook 28 may be provided
in case of long saw blades.
In its other constituents and functions the machine is as beforedescribed. Fig, XI.
shows the file t and end view thereof. It is preferably triangular with rounded
edges and a tapered end as shown.
п
The various small figures represent details, the parts are lettered and figured to
correspond with the same or similar parts in the principal figures.
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.
In machines for sharpening saws and the like.
1. The combination with a file of a prismatic bar d and mechanism for giving
a longitudinal reciprocal motion thereto a clamping head S pivoted on said bar, a
plate adapted to slide on said bar for lifting said head, levor for operating said plate
and pins u² or equivalent devices for operating said lever for the purpose set
forth.
2. A bed plate a having slanted edges in combination with frame
clamped thereto substantially as and for the purpose set forth.
adapted to be
3. The combination of the pulleys m and k and fork for shifting the belt from one
pulley to the other with pinions pn spur wheels go bevelled gear 1a 1d, 1b, 1 c
shafts 3a, 3b cams or equivalents on said shafts and mechanism adapted to be operated
thereby for the moving of said fork substantially in the manner and for the purpose
set forth.
4. The combination of pulleys m & k with fork for shifting the belt from one
pulley to the other rod supporting said fork levers V1 V1 spiral spring 5ª and rod V
or 5 adapted to be moved periodically back and forth for the purpose set forth.
5. The mechanism for automatic feed of the said blade comprising cam disc 4c
lever 18 rod 23 pawl 16 (or equivalent 23) on said lever and spring 17 substantially
as set forth.
6. The combination of clamping blocks y. z. inclined slot 7 i on one of said blocks
lever system 7, 7 a, 7 d, rod 76 having inclined portion 7k and cam 6c sub-
stantially as and for the purpose set forth.
7. The combination of frame sliding block 15, plate 13, bolt 9, cone 10,
washer 11, and nut 12 substantially as and for the purpose set forth.
8. The combination of slide 15 angle bar 26 and T bar 25 as and for the
purpose set forth.
9. A triangular file t having rounded edges and tapering end substantially as set forth.
Dated this 13th day of March 1888.