Year: 1888

page_text: We, GUSTAV WEBER of Gevelsberg near Barmen, Mechanical Engineer and KARL
JULIUS MAYER of Barmen Germany, Civil Engineer do hereby declare the nature of
this invention and in what manner the same is to he performed, to be particularly
described and ascertained in and by the following statement :-
Our invention relates to improvements in machines for cutting the thread on wood
screws having instead of an ordinary head (conical, spherical or cylindrical) a hook
or another one sided head.
Our machine is based upon the ordinary wood screw machine, but provided with
various devices, by which it is unade totally automatic and arranged wholly for power
gear.
The mechanisms for taking up the unfinished screw bolts are of new design and
so are the devices for preventing a new bolt reaching the working tool when it should
happen to be wrongly placed in the machine that is having the hook either foremost
or downwards instead of upwards. We have further introduced improvements, by
means of which more time is allowed for the operation of fixing a screw bolt between
the clamps and taking it out of them after the thread has been cut; this is of great
importance for the certainty of the automatic working and for securing a good quality
of work without reducing the quantity.
The improved machine is shown on the accompanying drawings of which
Figs. -IV show total views of the machine in plan, front view and vertical views
from the right and left side;
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12
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V-XV show those parts and mechanisms for cutting the screw thread;
XVI-XXII show the devices for taking a screw from the rectifying disc and
placing it into the clumps;
XXIII-XXV show the pointing mechanisms;
XXVI-XXXIV show the bolt holder and the taking up arrangement;
XXXV-XLIII are details of the rectifying device;
XLIV XLVI show the mechanisms for moving the table with the rectifying
disc;
XLVII-XLVIII show elements serving for allowing more time for setting a
bolt in the clamps;
XLIX LII show the tongs for taking out finished screws;
L-LIX show the clanip arrangements in two different forms in detail
}

page_text: Taking the finished screws out of the machine.
In order that these operations may be executed properly and at the right time,
various intermediate motions and devices are necessary which we shall describe in
their proper place.
We commence in giving first a description of those parts by means of which
the rotary motions are transmitted.
The machine and all its parts are mounted on a frame 1; on it we observe first
the bearings 2, which carry the shaft 3 with the main driving pulley 4. At the
right end of the shaft 3 is fixed the pinion 5 gearing with the spur wheel 6. This
spur wheel is keyed on a spindle 7 which lies in bearings 8; on the spindle 7 is
also fixed the pinion 9 which is in gear with the spur wheel 10 of the shaft 11.
This shaft is carried by bearings 12 and on it is also keyed the pinion 13 which
gears with the spur wheel 14 below it. The wheel 14 is keyed to the shaft 15
supported by bearings 16 below the machine (see figs. 1, 2, 4 & 10). The
shaft carries the pinion 17 which again is in gear with the box wheel 18
mounted on the shaft 11, so that it can turn freely round this shaft instead of
being keyed fast to it.
[
On the shaft 11 we also observe the grooved pulley 19 (see figs. 1, 2, & 34)
from which by means of a gut band the pulley 20 is driven on the little worm
spindle 21 which turns the worm wheel 22 on the top of which is fixed the dish.
shaped reservoir 23 containing the screw bolts to be cut. The worm wheel is held
from shifting downwards by a bracket screwed to the arm 24, round which it turns.
with the dish 23.
The pieces described above serve for transmitting rotary motion to the principal
working gear of the machine.
On the shafts named and in connection with the gear wheels we observe further
a number of cams, excentric discs and similar mechanisms, by which other parts
receive an oscillating or rectilinear to & fro motion.
We notice first the box muff 25 on shaft 3 which by being shifted in a
longitudinal direction governs the clamps for holding the screws.
On shaft 7. or rather, made in one piece with it we observe the guide screw 26,
by means of which this shaft receives its motion towards the left and transmits it
to the spindle 28, which carries the knife head 27, whereas a spring
a causes the
spindles 7 & 28 to go backwards-towards the right-when the screw 26 is free
from its nut 26 a (see figs. II, V & X).

page_text: On the spindle 7 we notice further the ring-cam 29 preventing the shaft from being
suddenly thrown to the right by the spring a when the screw is free from the nut 26 a.
A finger 29 a holding the cam ring and allowing it only to go back as it slides
along the finger which is pressed against it by a spring.
On the shaft 11 we find the excentric disc 30 keyed fast thereon and rotating with it.
By means of this disc the nut 26a is pressed against the screw 26 as will be seen
from fig. XI, whereas it is drawn away from it by the spring c as soon as the
depression at the circumference of the disc allows it (fig. XII).
.
On the boss of the disc 30 is formed a ring cam 31 by means of which the arm 32
(figs. I, XIV, XV, XLVIIa, XLVIII) of the bar 33 shifts this towards the left,
whereas a spring w tends to draw it to the right.
With the bar 33 is also connected the forked lever 34, having its fulcrum on the
box 35. The lever 34 takes hold of the muff 25, which as we have stated above
sets to work the clamps.
On the face of the wheel 18, which turns slowly round the shaft 11 is cut a
groove 36 (fig. XVI, XLVIII).
The pin 37 of the arm 32 reaches into this groove and thus gives the latter its
position, high or deep, respectively in or out of contact with the ring cam 31 on
the boss of the disc 30.
The pin 37 is securely held by the lever 32 between the faces of the wheel 18
and the disc 30. On the face of 18 it reaches into the groove 36 and on the face
of 30 it rests upon a projection 36a, corresponding with the groove 36 during the
greatest part of its way, in order to prevent that the pin can be depressed on one
side when the lever 32 is shifted to & fro on it.
The bolt 39 fixed to the head of the lever 32 is made thicker at its inner side
and of rectangular section and is provided with a groove 39a.
The projection 40 of the wheel 18 enters into this groove at a certain time to
hold the bolt 39 from going back earlier than is desired when a screw is set in
between the clamps as we shall explain hereafter.
On the other side of the wheel 18, cast in one piece with it, there is the drum 41
having the edge of its rim divided in various steps and the cam 58 fixed on its
circumference. Further to the left the boss of the drum is provided with the
excentric disc 70 and with the drum 96 with part of its circumference cut out,
and adjoining this we observe the disc 52 cast in one piece with the excentric 117,
projecting into the inside of the drum 96 and having on its rim the cam 118.
The disc 52 with the excentric 117 is keyed fast to the shaft 11.
Having so far described what we may call the rotary gear of the machine we
will proceed to explain the 7 various and distinct operations performed by the
machine and as they are mentioned above.
1) TAKING UP THE BOLTS FROM THE BESERVOIR.
The hook bolts XXVI to be provided with the screw thread are sorted of equal
length and thickness; they are then placed in the reservoir 23 (figs. XXXII & XXXIII)
of the shape of a dish or flat cup. The bottom of the dish made slightly conically,
inclined towards the centre; in the middle of it is placed the upright cone 62 ; the
outside rim is made of various heights or steps.
Near the end of the highest step of the rim a diaphragm 63 forming part
of a
screw is placed in the dish, adjoining closely the inner cone and the bottom of
the dish. The dish 23 can be turned on the bar 24 by means of the endless screw
and wormwheel gear 19-22 as explained above.
Against the frame of the machine there is fixed the oblique channel 64, which
at the bottom end runs out horizontally to form the guide 65 and the bridge 65a
for the table of the rectifying disc.
At the upper end of this fixed channel 64 a prolongation 66 is hinged to it, which
can be bent up and down. The end of this prolongation is widened and made in the
shape of a shovel; it is so arranged that when depressed it fits closely to the bottom
of the dish and touches the edge of the cone 62.

page_text: The piece 66 is supported by the rim of the dish and this gives it its position up or
down according to the height of the rim, where the channel rests when the dish turns
round and so the hook bolts are taken up by the shovel end of the movable channel
and are directed in and along it, when it goes up and then they glide down to the
table and rectifying disc. The shove! part of the piece 66 is provided on that sido
where it lies against the cone 62 with an upright flange as shown by figs. LX to LXV;
the shovel itself, that is the broad part is slightly curved and inclined towards that
side, so that the bolts have naturally the tendency to glide towards that flange.
Now at a distance of about 2 inches from the end where the shovel plate goes
over into the real channel 66 and where a vertical flange is also on the other
side, a gap 67 is cut into the first flange and hence it follows that bolts lying
crossways on the shovel will slip through the gap and fall back again into the
reservoir 23. In order to prevent also such bolts to go down the channel and
coming into the machine, which lie in it lengthways, but having the hook end
downwards as shown at A fig. XXVIII we have fixed the shield 68 on the
channel 66 (fig. XXIX). This shield has an opening 68a cut in it and tapering
towards the top which is wide enough at the bottom to allow the passage of the
hooks when they are lying in the channel in their right position, but through
which they cannot pass when lying in the reversed way, with the hook end at the
bottom of the channel. When the movable channel 66 then goes down again these
stopped hook bolts fall back down into the dish.
The bolts are lying correct in the channel when their pointed end is foremost and
the hook upwards. Such bolts glide down in the channel and then come on the table
and into the rectifying disc 76 and are carried forwards in it without undergoing any
other operation for being taken out of it and being brought to the clamps as we shall
see presently.
2) CARRYING THE BOLTS IN PROPER POSITION TO THE RECTIFYING DISC.
On the boss of the wheel 18 is fixed the excentric 70 acting upon the bent lever 71
which is fixed on the spindle 72. Two arms 73 connected therewith hold a
crossbar 74 and a spring h' fixed to a lever 73¹ has the tendency to pull the lever 71
down upon the excentric. A connecting rod 75 connects the lever 71 with the
table 69 & thus the excentric 70 governs the position of the table 69 by raising or
lowering the lever and draws the table with the screw in it backwards and
forwards.
It is of importance to observe that the excentric 70 has two steps B & C. This
has for its object to advance the rectifying disc at a certain point instantly a little
distance, that when a bolt is taken out of the disc it shall not strike against the
corners of it.
We also call the attention to the construction of the connecting rod 75. This is
made of two pieces coupled together in the middle, simply by having the two ends
stuck into a coupling box, which allows the bars to be withdrawn; a strong spring i
pulling the two ends together.
Now if it happens for some reason or other, that the table cannot go its whole
stroke, the connecting rod still allows the excentric to make its complete rotation
because the spring i allows that the rod now gives way without overstraining any part
of the machine.
In order to prevent the bolts lying in the channel 64 to glide down irregularly and
continually a stop slide 93 is applied with the channel 64. This consists in a double
beat pin, one part of it reaching into the channel 64 and crossing its passage by being
always pressed forwards by a spring m which is put round the other branch of it,
which passes underneath the channel as shown by figs. XXVII & XXVIII.
As fong as the upper branch of the stop slide reaches into the passage of the
channel 64 no bolt can go down in it. Therefore a finger 94 is fixed to the table 69,
which strikes against the stop slide when the table has advanced fully and opens the

page_text: passage and now only the bolt can go down, but only this one. The next one and all
above it being held back by a similar stopping arrangement 87, 88 & 89 which is
opened when the table goes back its full way, as we shall explain below.
The bolt having passed the stop slide 93 at first rests on a slide plate 69a placed
on the top of the table 69 which holds it and prevents it from falling through the
rectangular hole 77 in the middle of the rectifying disc. The slide 69a is held in its
forward position by a spring n and is pushed back to allow the bolt to fall down from
it into the groove 78 of the disc when the table is completing its backward motion,
and thus it will be understood, that the bolts are brought to the table and rectifying
disc in proper order and as desired.
Toremost, by 100 degrees.
This is done as follows: from the detail figures XXXVIII to XLIII it will be
seen that the table consists of a rectangular plate 69 carried by guides 65 which
form together with the bridge 65a the foot of the oblique channel 64. At the
inner or back side of the table the connecting rod 75 takes hold of it. The rectifying
disc 76 is so placed into the table near its inner end, that the upper surface of both
is straight. In the middle of the disc a rectangular bole 77 is cut out of it and a
groove 78 goes diametrically through it. This groove is so deep that a bolt is totally
embedded in it, leaving only the hook.to project out of it. When the table is drawn
quite back this groove comes to stand exactly in a line with the channe! in 64; it
forms the horizontal prolongation of it and takes up the bolts coming down in 64.
There are two other grooves 79 cut in the disc at right angles to the groove 78, right
and left from the centre, and in each of these grooves there are cut at opposite sides
the eyes 80 and right and left of them segmental pieces are cut away from the disc to
a certain depth. There is also cut out of the table 69 a part 81 to the same depth,
so that this part and the segmental pieces are flush when the disc is placed in the
table. A finger 82 is put on the table and disc in such a manner and of such shape
that it covers the left segmental piece of the disc and while it can be turned round its
outer end, where it is hinged to the table, a spring 7 at its curved or inner end
draws it towards the right, holding it against the disc. Now an other finger 83 is
fixed to the bridge 65a in such a manner that its end reaches down upon the plate
of the table and that it can turn on a pin, by which it is fixed to the bridge. This
finger 83 is held by a spring k and by an adjusting screw 84 in such a manner that
its end touches the table in a line with the left side groove 79 and the finger 82 is
bent So, that if the table is pushed forwards it prevents the finger 83 to enter into the
groove, and that it is pushed on one side by it when a bolt lies in the disc in the proper
manner as shown by fig. XL.
If however a bolt lies in the disc with the hook on the left side, it must be turned
by 180° and this is done in the following manner: At the back part of the bridge 65a
there are two openings, right & left; that on the right side is quite free so that a
bolt lying in the disc properly, that is with the hook at the right side, can pass
freely below the bridge. The opening on the left side is partly closed by a
plate 85 (fig. XLI), therefore when the table is pushed forwards and a bolt is lying
in the disc with the hook on the left side, the hook will strike against the plate 85
and because the touching point is excentric to the centre of the disc it will cause this
to be turned in the table so much that the bolt can pass by the plate 85 while the
table is advancing. Now the finger 82 lies against the segmental piece cut out of the
disc and the "cord" of this segment will therefore also press that finger on one side
as shown by fig. XLI, so that the front end of it will come out of the way of the
finger 83 and when the table advances further, finger 83 will reach into the now partly
turned groove 79 of the right side of the disc, and then it will catch the eye 80 in the
disc, hold this latter excentrically and thus complete its turn to 180° when the table
further advances and has made its complete stroke, and the bolt in the disc arrives at

page_text: its destination in such a position as if it had been laid in it in the proper way at the
beginning and now it can be taken out of it as desired.
If however, the mechanisms taking the bolt out of the dise should, for some reason
or other, not do their duty, then the holt remains in the disc and is taken back again
with the table and now it must be prevented that another bolt in the channel 64
besides the one gone down already and lying on the slide 69a can come fully down to
the table.
We have observed that the lowest bolt is held by the stop slide 93 and that it is
allowed to go fully down only when the table has advanced its full stroke. The bolt
above it is then still held by the stopping arrangement 87, 88, 89.-88 is a flat spring
fixed with one end to the channel 84; 87 is a pin, fixed to the middle of this
spring and passing underneath the channel and projecting beyond it at the other side;
89 is a short pin reaching just into the channel and crossing its passage so as to hold
the bolts from going downwards and opening only when the table has gone fully
back, because then only the finger 86, which is fixed to the connecting rod 75, pushes
against the pin 87 and thus also presses back the stop pin 89 and then the bolt
can go down.
If however the bolt in the rectifying disc has not been taken out from it and is
brought back again, the look of the bolt strikes against the bolt lying on the table
and thus prevents the table going fully back. The finger 86 does not touch the pin 87
and the stop pin 89 keeps the passage in the channel 64 closed; no new bolt can
come down.
In the mean time the taking up apparatus would continue to take up bolts from the
dish and lead them to the channel 64, but as there is no room in the channel these
new bolts would slide over it and fall down into the machine. The bolts lying in good
order in the channel are prevented from being disturbed by the new ones by means of
a cover 90 which guards them in the channel.
Now when the channel is full and no bolts are allowed to go out at the bottom as
we have seen, the taking up apparatus ought not be able to take up new ones and
ought not go down with its end into the dish. For this reason we fix the strap 91
near the place where the movable part 66 of the channel is connected to the fixed
channel 64 and the part 66 is so arranged, that it forms a double armed lever
with a short arm at the left side of its fulcrum, just reaching to the strap 91.
On the opposite side of the strap 91 there is cast a triangular projection 92 to the
channel 64 and to the movable arm 66 we fix a spring and pin 95, the pin reaching
into the channel. If then the arm 66 is raised up fully (fig. XXXa) the projection 92
pushes back the spring and pin 95 out of the channel and a bolt lying in it can go
down if the passage below is free, but if the passage is not free the bolts remain in
their places and the one that happens to lie just in the connecting place is taken
upwards by the short arm of the channel 66 when this goes down again and the bolt
would also slide down back into the dish 23. This is not our object and would not
answer our purpose. As soon as the piece 66 has turned on its fulcrum so much
that the spring 95 is free from the projection 92, its pin presses against the bolt lying
there and holds this fast, that it cannot go either way and in consequence of the
tendency of the heavy right side of the piece 66 the bolt is now pressed between
the strap 91 and the channel 66 and thus the latter can not go further down into the
dish, but is held horizontally as shown by fig. XXVIII. No new bolts can be taken
up. By the next turn of the dish the arm 66 is raised up again and then the bolt is
freed from the pin. 95 and can go down, if room has been made in the channel 64 in
the mean time.

page_text: On the shaft II we notice the drum 96 (figs. XLV XVII and XVIII) cast in one
piece with the wheel 18 and with the excentric 70. A curved lever 110 fitted on
spindle 72, so that it can be turned upon and round it, is pulled with its end down
upon the circumference of the drum 96 by a strong spring which pulls at the end
of a lever 111, fixed to the hoss of the lever 110.
To the boss of the lever 110 is also fixed the arm 112 at the end of which are the
pincers 113. These are fixed to the arm 112 by a link joint so that by means of a
spring and crunterspring they are not absolutely stiff and take hold of a body in their
way like thumb and forefinger of the hand.
The positions and the movements of the pincers are governed by the lever 110 upon
the drum 96. On the latter we observe first a little depression 115; when the
lever 110 steps into it the pincers go down to take hold of the bolt in the rectifying
disc 76 of the table 69 (fig. XVII) which now lies deeply embedded in the
groove 78 as shown in an enlarged view fig. XX.
Immediately afterwards the lever 110 rises out of the gap 115 and the pincers,
having taken the bolt, lift it out of the disc. This movement of the pincers being a
circular one and not going upwards in a vertical line (figs. XX & XXI the corners of
the grooves 78 would strip off the bolt from the pincers and it would fall back again,
therefore during this short interval of time the table makes a short step forwards, so
that the corners get clear of the bolt. This is caused by the steps B & C on the
excentric 70 as explained before.
By this combination we not only are enabled to take out the bolts safely from the
disc, but it enables us to make the grooves as deep as we like, so that when the bolt
by accident remains in the disc and is taken back again, this is not bindered by
anything coming in the way until the hook of the bolt reaches that bolt that ineanwhile
has come down upon the table. The drum 96 continuing then its rotation with the
lever 110 pressed down upon it, until it reaches the large gap 116. Now the
lever 110 goes down into this and reaches the circumference of the oxcentric 1.17,
which is keyed fast on the shaft 11 and placed inside of the drum 96 (fig. XVIII).
In consequence of this the pincers also go down so deep that the bolt is brought in a
line nearly central with the clamps (figs. XIX & XXII) and the bolt is then shifted
into the clamps.
In order to do this we fix a cam 118 on the excentric 117 and this cam presses the
end of the lever 110 towards the right and with it the pincers 113 holding the bolt.
In the very moment when the bolt has been carried far enough to the right into
the reach of the clamps they close; the cam 118 allows the lever 110 & the pincers
to be drawn towards the left again by means of a spring and then the excentric 117
causes the lever 110 and the pincers 113 to rise again to the surface of the drum 96.
We must add here that the pincers bring the bolt at first a little deeper than central
to the clamp-shaft. For this sake we make the step on the inner part of the
excentric 117 as shown by fig. XVIII.
The object of this is to bring the middle of the hook central to the clamps so that,
when they rotate round the bolt, there is more space left between the circle, they
describe round the hook, than would be the case, if the bolt were held centrally to
the clamps. This gives a greater security against the clamps striking against the
hooks during the action of the introduction of the bolt into the clamps.
Now the clamps alone would not hold the bolt fast enough, so that the screw thread
can be cut on it and therefore the mandril 119 must be pressed against the bolt when
the pincers have gone up again.
The mandril 119 is placed between the brackets 49 & 50 on a spindle 120; a
spring & pulls it backwards (figs. XIV, XV, XXII & XXIII). Its upper head at
times bears against a slide 122 which is guided between the brackets 49 & 50; a strong
spring t pulls it towards the right and then it presses the mandril forwards. It is
pressed towards the left by the pin 123 at the end of the bar 33. In order to allow
the mandril to perform its backward and forward motion steadily and in such moments
when other parts-the pincers are brought out of its way, we have invented the
following devices.

page_text: We have mentioned above a projection 40 on the wheel 18, which interlocks with
the groove 39 in the bolt 38 and we shall now explain the object of this device.
During the time while the projection 40 passes through the groove in 39 the arm 32,
and therefore also the bar 33 cannot go back (towards the right) though the
cam 31 would allow it. This period falls together with the period when a finished
screw is taken out of the clamps and a new bolt is set in. The mandril cannot
be thrown backwards suddenly and strike against the pincers or otherwise come
suddenly in contact with other parts. For further security we put on the head
of the mandril the horn 127 and at the end of the pincer lever 112 we fix the
arm 128. These two now act together in such a manner that the mandril head
cannot be thrown back suddenly by the spring, and that the spring t cannot
pull back the slide 122 in a similar way notwithstanding the bar 33 or the pin 123
and the lever 32 become free of the cam 31 and the bolt 38 has also got out of
the projection 40, the horn 127 must slide along the bar 128 and therefore cannot
fly forwards suddenly, even if the slide 122 were pulled to the right instantaneously
and so every danger of a collision is avoided.
To complete this chapter we have yet to explain the action of the clamps.
The shaft 3 (fig. LIII) is slit through for the greater part of its length; in the
slit-122 is fitted a slide 12 having projections, which bear against the flange of the
muff 25; from the right side a strong spring u presses against the slide 123. The front
end of the slide is cone- or roof-shaped; the slide as well as the muff roach into the
driving pulley 4.
In the front end of the shaft 3, which is here made thicker and then reduced again,
to form the journal for the bearing 2, there are fixed on pins 126 the clamp
levers 125; springs & pressing their inner ends together and holding the clamps
separated. It will now easily be understood, that when the parts 31, 32, 33 & 34
come to action as described above and allow the muff to go to the left the strong
spring u will force the slide 123 into the clamps and cause them to close and hold
the screw bolt, which of course is so arranged that it happens just when the pincers
have brought down the bolt central to and into the clamps.
Now it may be desirable and of advantage to stop the rotation of the clamps
during the period whilst a bolt is placed into them." For this object we make the
clamp arrangement as follows and as shown by figs. LIV to LIX.
Instead of the shaft 3 with the driving pulley 4, the box muff 25 and the other
accessories 123 to 126 for working the clamps we place in the bearings 2-2 the
combination shaft shown. This consists of a spindle 130, the left end of which is
slit or forked and in the slit are fixed the clamps 132; the journal 133 rests in
the left side bearing 2. Right of this journal the spindle is made hollow and its
right end is made thinner and projects into and fits closely to the thinner part 135
of a cylindrical box 136.
To the end of 136 is screwed the pinion 5 and the part 135 serves as journal
or support for the spindle 130 and rests in the right side bearing 2.-Into the left
and enlarged part of 136 and on the spindle 130 fits the box 137 which has also
cast to it the driving pulley 138. Longitudinal grooves on 137 and corresponding
keys 139 on 136 allow that 137 may be shifted lengthways, but not so much
that they can get out of gear from each other & thus when 138 is turned 136 must
always revolve with it.
Now the box 137 or the driving pulley 138 is provided with the two prongs or
fingers 140 which reach into the gaps 141 (cut for this purpose in the shoulders
of the journal 133 of the spindle 130) when the pulley 138 is shifted to the left,
but which do not engage with the spindle 130 when the pulley 138 is pushed to
the right and then of course, the spindle 130 does not revolve and the clamps 132
fixed to it are stopped also from turning round.
Now in order to stop the spindle 130 for certain and for shifting the pulley 138
the following arrangement is made: a lever 142 corresponding to the forked lever 34
(fig. LIII) is placed on the place of the latter and this lever 142 is shifted in a
similar manner by the cam and disc 30 & the bar 33 respectively. At the end of

page_text: On shaft 11 (figs. I, V, X, XII & XV) we notice at the left side of the wheel 18
the drum 41, the rim of which is divided in steps and so getting gradually higher. A
lever 42 fixed to a bracket on the machine frame is pressed against the rim of the
drum 41; a rod 43 is connected to the lever 42 and transmits the gradual movements
which the lever 42 receives from the rotating drum. The end of the rod 13 bears
against a wedge shaped slide 44 (fig. V, VIII & IX) and in the same horizontal level
with this wedge there are placed two similar pieces 45 & 46. They are all three
mounted in the slits 47 & 48 of the brackets 49 & 50. To the bracket 50 is also fitted
the shaped slide frame 51 running transversely to the wedges 44, 45 & 46.
We observe close by the bracket 12 a disc 52 keyed to the shaft 11 and at the end
of the wedge 46 we see the guide roller 46a standing against the rim of the disc 52
towards which it is pressed by the spring d and a spring e presses the wedge 44 also
towards the right against the rod 43.
The figures I, V, VIII, IX & XIII now show that while the drum 1 is turning
round, the wedge 44 is gradually pushed towards the left, the lever 42 transmitting
B

page_text: the movement from 41 to the rod 43 etc., therefore the oblique face of the wedge 44
which presses against the slide. piece 51 will cause this to be periodically pressed
backwards.
Now the front arm 51a of the slide 51, which we shall describe in detail below,
bears against the knife head 27 and therefore this is also advanced periodically. The.
wedge 45 is fast upon the frame 49 by a pin 45a and can not move lengthways but
only sideways with its front end. During the greater part of the rotation of the
disc 52 the slide 46 is pushed towards the left and only for a short period, when the
spring d presses it with the guide roll 46a at its end into the gap on the rim of 52
it advances suddenly towards the right and immediately afterwards it is pushed
forwards again.
This period corresponds in time with the steps on the drum 41; while the wedge 46
is pushed towards the right the inclined face y of 45 can fall down upon the inclined
face on wedge 46 and the wedge 44 will follow after 45 in its lateral motion, if a
pressure in that direction forces it to do so. Now we have observed above that the
slide frame 51 bears against the inclined face z of wedge 44 at the inner side and
that its front arm 51a bears against the knife head 27. The latter is keyed fast on the
spindle 28 which can turn freely and slide lengthways in its bearings. A spring 1
(fig. I, VI &-X) tends to make it swing towards the front and thus presses the knife
head against the arm 51a of the slide frame 51 and so the pieces 44, 45, 46 & 1 will
take the position shown by fig. VIII and in dotted lines by fig. VI when the
wedge 46 is pressed towards the right. Coinciding with this position of the knife-
head for cutting the screw thread is the position of the nut 26a of the screw 26 shown
by fig. XII; the nut is free from the screw. The screw spindle 7 therefore will be
quickly pushed towards the right by the spring a, & the spindle 28 carrying the knife
head will follow it in consequence of the pull of the spring a.
By this action the knife will be brought towards the hook end of the screw bolt, so
that it can begin cutting the thread there when it is brought forwards again against
the bolt. This is done as follows: from fig. VIII it will be seen that the inclined
face of 46 bears against the inclined face y of 45 and that the frame 51 bears
against 44. Now if 46 is pushed towards the left its oblique face & will slide along
the face y and press the wedge 45 backwards and so the wedge 44, and with it the
slide frame 51 will be drawn backwards and thus the knife will be brought in contact
with the screw bolt. In the meantime the nut 26a has been pressed down again into
the threads of the screw 26 and therefore the spindle 7 will advance towards the left
and push the spindle 28 with the knife head in the same direction and so the thread
will be cut of same pitch as the screw 26.
This play and succession of actions will be repeated as often as there are steps on
the drum 41; with every step the knife will advance a little closer towards the
screw bolt and cut the thread deeper. This is caused by the gradual advance towards
the left of the wedge 44 in consequence of which its inclined face z will hold the
piece 51a little higher (figs. V VIII & IX). In order to be able to adjust the depth
or thickness of the cut made by the knife, the knife head and the arm 51a are
provided with the following arrangement.
The arm 51a is of shape (fig. V, VI & VII); into this channel is placed a
piece L with a half round hollow face in front; the piece L is held by set screws M
and into the half round hollow face is laid a conical piece N being held by screw 0 j
by means of which it can be pushed forwards and backwards. To the back side of the
knife head is fixed by means of an adjustable screw a double piece P Q opening like
the shanks of compasses, the piece P being fast, the shank Q being able to open or
close by means of the screw R. From this description and from the figures it will
now be understood that by means of the adjusting screws M, O & R it is possible to
bring the knife for cutting the screw thread in any close proximity to the screw
from the beginning and so have a deep cut or not, as may be desired.
If by the means described the thread has been cut, the screws are finished and
must be taken out of the clamps automatically and the mechanisms for this we shall
now proceed to describe. .

page_text: 7.) TAKING THE FINISHED SCREWS OUT OF THE CLAMPS.
Figs. XLIX to LII.
The drum 96 on shaft 11 is provided on its circumference with the cam 97 and at
the back of the brackets 49 & 50 we observe the slide 98, which is so arranged. that;
it just touches the circumference of the drum 96. A spring w pulls the slide 98
towards the right, therefore when the cam 97 comes in its way, the slide 98 is forced
towards the left and with it the connecting rod 99 which connects the slide with the
double arined lever 100.
.1.1.
The longer arm of this lever is slotted at its front end and is provided: with a slide
block into which reaches the arm 101 of another slide 102, held in a bracket 103,
fixed to the front end of the machine (fig. III). and to this slide. 102 again is
fixed one shank 105 of the tongs by means of which the finished screw is
withdrawn.
This is done as follows: the slide 102 is pushed towards the right and with it the
tongs; now the shank 105 as shown by fig. L & LII is bent out twice at S & T and
it passes below a guide plate 106; a spring o, wound round the bolt 104, by means
of which the shank 10 is fixed to the slide 102 tends to hold the tongs upwards and
the guide plate 106 presses them down so that they do not come in contact with the
frame 51 while they are passing below it and only rise when they are near the
screw. A spring p presses both shanks of the tongs. together at their front end,
so that they will open when pressed against or over the pointed screw but will hold
it fast.
"
When the tongs have advanced far enough (fig. LI & LII the clamps open and
in that moment also the cam 97 on drum 96 allows the slide 98 to go to the right
which is caused by the spring w and thus the tongs, now holding the finished screw,
move towards the left. When the slide 102 and both shanks 105 & 107 of the tongs
have gone far enough to the left (fig. XLIX & L) they must open and allow the
screw to fall out. For this purpose the shank 107 is made at its left end 108 of
wedge shape and an arm 109, bent at a right angle is fixed in proper distance to the
bracket 103, by which the inclined face 108 is pressed inwardly so that the tongs
must open at the other end where they hold the screw and this consequently
falls out into a sloping channel 129, in which it is guided to a suitable
receptacle.
Having now particularly described and ascertained the nature of our Inven-
tion and in what manner the same is to be performed, we declare that what we
claim is:
An automatic acting machine for making wood screws with hook shaped or one-
sided heads, distinguished by:
1. The arrangement of the shield 68 upon the movable arm 66 of the up take
arrangement, with the conical openings for preventing bolts to pass through, that
are not lying in the channel in suitable order and the gap 67 in that part 66 of the
up take.
2. The strap 91 at the top of the channel 64 and the projection 92 in combination
with the movable part 66; the spring and pin 95 to prevent the piece 66 from going
down into the dish when no new bolts shall be taken up.
3. The finger 86 connected to the connecting rod 75 and the pin. 87 on the
channel 64 in combination with the spring 88 and stop pin 89 to regulate the
advancing of the hook bolts into the rectifying disc and to prevent the advancing of
the bolts when the preceding bolt has not been taken out of the disc.
4. The plate 85 and the finger 83 in connection with the table 69 and the
rectifying disc with the canals 79 and eyes 80 in it for turning the disc when a bolt
is placed in it with the hook standing on the wrong side.
5. The finger 82 covering a segmental piece of the rectifying disc 76 and being
bent at its end, to close the passage into the canal 79 when no turning of the

page_text: disc is required, but being pushed on one side by a partial turning of the disc in
consequence of a wrongly placed hook bolt striking against the plate 85 and so
opening the passage into the canals 79.
6. The step or rise on tho face of the excentric 70 to cause a momentary
advancing of the disc when a bolt is taken out of it by the pincers 113 to prevent
the bolts striking against the corner of the disc.
.
7. The projection 40 on the wheel 18 in connection with the groove 39 in bolt 38
to stop the movement of the parts 25, 32, 33, 34 and 123 for a longer period
during the time a new hook bolt is put into the clamps.
8. The excentric 117 arranged so that the pincers governed by it shall hold the
shaft of the bolt excentrically to the axis of the clampshaft, but holding the middle
of the hook central to the clamps and shift the shaft of the bolt centrally only
just before the closing of the clanips..
9. The arrangement described and shown by figs. LIV to LIX for stopping the
clamps from turning when a bolt is set in and taken out of them to prevent the
hooks striking against the clamps.
KARL J. MAYER,
For G. Weber and self.