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Патент USA US2113530

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April 5, 1938.
Filed Dec. 28, 1956
FIG. 1.
w 75
,___ ____..._.________,
Patented Apr. 5, 1938
Hale Paxton, Santa Ana, Calif., assignor to Food
Machinery Corporation, San Jose, Calif., a cor
poration of Delaware
Application December 28, 1936, Serial No. 117,724
2 Claims.
This invention relates to safety devices and has
particular utility in nailing machines.`
In nailing machines for making boxes auto
matically the component parts of a woodenA box
5 are fed from suitable magazines by various feed
ing mechanisms into the proper relation to» be
nailed together to form a box and are there suit
ably assembled by a nailing mechanism nailing
the sides and the bottom of the box to the ends
10 thereof.
In such an automatic machine all of
the mechanisms contributing to the assembling
of the box are operated coordinately from one
source of power.
In the past it has been cus
tomary in operating these automatic machines to
15 control their stopping and starting with a clutch.
Owing to box parts occasionally being warped
and jamming one or more of the feeding mech
anisms, it has been necessary for the operator
of the machine to run it With one hand on the
20 clutch lever so that he could stop the machine
immediately upon observing the malfunctioning
of any mechanism therein.
As these automatic machines produce boxes at
a rate of over four hundred and ñfty an hour
25 the strain on the operator of having to watch
each operation of the machine to see that it was
performed correctly was a considerable handi
cap in continuous operation of these machines.
Furthermore, it was almost impossible for the op
30 erator to notice that things were going wrong
until the diiîiculty had proceeded to such a point
that a box was improperly nailed together in
the machine, thus making it necessary to remove
this box from the machine and rebuild it by hand.
35 In other cases the delay necessarily incident to
observing the malfunctioning of certain mech
anisms in the machine would result in box parts
becoming jammed in the machne so tightly that
the operation of the machine would have to be
40 interrupted for a long period while removing the
damaged box material and resetting the machine
for automatic operation.
It is an object of this invention to prevent mal
formation of boxes or the serious jamming of box
4.5 material in an automatic box making machine.
One of the principal causes of jamming in
automatic box making machines is the locking to
gether of adjacent box ends by virtue of the fact
in such a knot hole and keys the two pieces of
shook together. Thus when the machine under
takes to feed one of these pieces of shook from
the magazine it is locked to a piece next thereto
which is disposed back in the magazine and thus
prevents the foremost piece from responding to
the feeding mechanism.
One way this situation was formerly taken care
of was to form a portion of the feeding mech
anism feeding these box ends of such light ma- 10_
terial that it would break in case of jamming
from the cause just described. The first evidence
that the operator would have if he was alert
would be the failure of one of the box ends to be
fed into the machine at the commencement of a 15
box assembling cycle. If the operator failed to
notice this omission immediately the manufac
ture of an incomplete box was started before the
clutch could be thrown out and the machcine
stopped. Before the machine could again be
started themissing box end would have to be N 0
supplied to the assembling mechanism and the
broken feed device would have to be replaced.
It is another object of this invention to not
only eliminate the necessity of the operator hav
ing to» constantly observe the operation of the 25
mechanism feeding box ends in an automatic box
making machine but also to eliminate the break
ing of the mechanism feeding these ends and
the starting of incomplete boxes by failure of
such mechanism to feed an end when required.
The manner of accomplishing the foregoing
objects, as Well as further objects and advan
tages, will be made manifest in the following de
scription taken in connection with the accom
panying drawing, in which:
Fig. 1 is a fragmentary side elevational view
of the box end feed mechanism on one side of
the automatic box making machine shown in
U. S. Letters Patent No. 1,844,333 issued to Elmer
C. Northrup on February 9, 1932, said view show
ing said box end feed mechanism with the pres
ent invention embodied therewith.
Fig. 2 is a plan view of the feed mechanism
shown in Fig. 1.
Fig. 3 is a cross sectional view taken on the
line 3_3 of Fig. 2.
Fig. 4 is an enlarged fragmentary cross sec
that these adjacent pieces have been sawed from Y tional view taken on the line 4-4 of Fig. 3.
50 a log at the mill without changing the relative
As the particular mechanism shown in the 50
position of the material in these pieces as it ex
drawing for feeding box ends into an automatic
isted in the log. This circumstance often re
box making machine is, with the exception of
suits in such adjacent vpieces having a com
the new parts therein embodying the present in
mon knot hole extending through the two pieces.
vention, shown and described in the aforesaid
55 Sometimes a section of the knot becomes loose Northrup patent, the disclosure in the North
rup patent will, to simplify the present specifica
tion, be embodied therewith by reference.
For convenience the letter E will be used to
designate said box end feeding mechanism and
the letter N to designate the nailing machine
with which this feeding mechanism is embodied.
Attention will ñrst be directedto the old parts
of the mechanism E by use of the same reference
characters by which these parts are identified in
10 the aforesaid patent. Thus it is seen that the>
mechanism E is supported on frame 2 of the
nailing machine N and carries a stack of box
ends 6 which individually are disposed vertically,
the stack itself being echeloned by the fact that
15 it is supported in a downwardly sloping hopper 1.
The box ends 6 are adapted to be fed forwardly
|30 is mounted for idle rotation. The clutch |3|
also includes a sleeve |33 which surrounds the
clutch base |32 and is integral with the sprocket
|30. Sleeve |33 has a tube |34 extending radially
therefrom this tube having a cap |35 through
which a plunger |36 extends. The plunger |36
has a head|31 on its inner end and a nut |38 on
itsouter end and a spring |39 is coiled about the
plunger |36 between the cap |35 and the head
|31. Provided in the clutch base |32 is a recess 10
|40 into which a steel ball |4| is continually
urged by contact of the head |31 with this ball
under pressure of the spring |39.
Being integral with the sprocket |30, the sleeve
|33 and other parts mounted thereon rotate with 15
the Sprocket |30 as long as the power mechanism
of the nailing machine N to which the chain 18
one at a time by a lug 14 which is pivotally sup
ported on a vertical axis on a horizontally recip
is connected, continues to function. This power
rocating carriage Il, the movement of which is
mechanism is run by an electric motor (not
20 imparted thereto by an arm I2 connected with
the power mechanism of the machine N. The
carriage || in each of its horizontal reciproca
tions feeds slats into the machine for forming
one of the sides or the bottom of the box being
25 assembled in the nailing machine N, but only one
set of box ends 6 is required during all three of
these side and bottom assembling operations. It
is necessary, therefore, for the carriage || to
make three horizontal reciprocations and feed
30 a set of box ends 6 into the assembling appa
ratus of the nailing machine N only during the
first of each such group of three reciprocations.
To prevent the feeding of box ends 6 excepting
during the first of each group of three slat feed
35 ing reciprocations by the carriage I I, the box end
hopper 1 is provided with a forward plate 1a
which guides the box ends 6 as they slide down
wardly in the hopper 1 toward the lug 14 so that
the rear edges of the ends 6 are disposed to the
40 L: rear of the forward edge of the lug 14 when the
carriage I I is in its rearwardmost position. This
relationship between the box ends 6v and the lug
14 effectively prevents the feeding of a box end
from the` hopper 1 excepting when the foremost
45 .i box end 6 is fed forwardly a sufficient distance so
that its rear edge is in advance of the front edge
of the lug 14 thereby permitting the latter to
be swung by its spring 14a behind the foremost
box en_d 6 so that upon the next forward move
lment of the carriagevII the lug 14 thereon will
feed this foremost box end 6 into the assembling
mechanism of the machine N.
To accomplish this initial feeding movement of
the foremost of the box ends 6 so that one of
55 these box ends is fed forwardly lby each third
shown) the circuit of which, in this invention, 20
includes a switch _|50 which is adapted to be
acuated by a control arm |5I, the latter being
connected by a link_,|52 to a cam arm |53, the
other end of the latter arm being pivoted at |54
to the frame 2.
The cam arm |53 has a curved
portion, |55 the. curvature of which is formed
about the axis of the shaft 11 with a radius just
slightly longer than that at which the outer ex
tremity of the plunger |36 normally revolves.
When the box making machine N is operated
to make a box the box ends 6 are advanced one
at a time by the lever 15 so as to be fed forwardly
by the carriage I | with each set of slats for form
ing the first side to be assembled with the box.
In case the foremost of the box ends 6 in the
magazine 1 were for some reason to jam, as
would be the case if they were keyed together by
a loose knot in a common knot hole, there would
be such a resistance setup to the forward move
ment of the lever arm 15 by the cam 16 that the 402
torque clutch base |32 would be held still with
the shaft 11 and the steel ball |4I would be
forced from the recess |40 by the increased torque
set up between the sleeve |33 and the clutch
base |32.
The angular relation of the clutch tube |34 to
the cam arm 16 when the ball I4| is located in
recess |40 is as illustrated by the full line posi
tions of these elements in Figs. 1 and 3. In the
event of the jamming of the Vforemost box end 56:1
6 in the magazine 1 and the dislodging of the ball
|4I from the recess |40, a radial outward move
ment of this ball would result which pushes the
plunger |36 outwardly, as shown in its dotted
line position |10 in Fig. 3. Although still rotat
forward movement of the' carriage II, a lever 15
ing with the sprocket wheel |30 the plunger |36
is pivotally mounted on the frame 2 and this
lever is moved by a cam arm 16 on a shaft 11.
is, by its outward movement, caused to lift cam
arm |53 thereby swinging the switch arm |5|
from its full line position in Figs. 1 and 3 to its
broken line position in Fig. 3 which opens the
switch |50 and stops the power mechanism which
drives the nailing machine N. Thus the entire
which is rotated by a chain 18 one revolution for
60 each three reciprocations of the carriage I I. The
rotating of the shaft 11 is so timed by the man
ner in which the chain 18 is connected to the
power mechanism of the nailingmachine N that
a box end 6 is fed forwardly into its dotted line
65 position 6a just in time to be caught by the lug
14 as the carriage || starts forward to feed the
side slats into the machine for forming the first
side of a box.
The parts described hereinabove are old in the
70 aforementioned Northrup patent, the addition to
the art provided by the present invention being
described as follows. Chain 18 is connected to
the shaft 11 through a sprocket |30 with which
is embodied a torque clutch |3|.
This torquev
75 lclutch includes a base |32 on which the sprocket
machine is stopped automatically and without
the intervention of the operator and without there
being any necessity for his even observing the 65
jamming of the box ends 6.
The stopping of the machine of course immedi
ately calls itself to the operator’s attention.
When upon examination he discovers the source
of the trouble it is only necessary to lift the
jammed box ends 6 from the hopper 1, reset the
clutch |3| by seizing thecam arm 16 and rotating
this into the position which it would have had
if the jamming had> not occurred and then imme
diately start the machine to continue with the 754
manufacture of boxes.
It is thus seen that a
resumption of full automatic operation of the
nailing machine N after being interrupted by a
jamming of the box ends when this machine is
equipped with my invention is an extremely
simple and short process compared with the ardu
ous repairs formerly needed before operations
could be resumed.
It is also apparent that when the nailing ma
10 chine N is equipped with my invention the need
for the operator constantly observing the func
tioning of the two box end feed devices E on the
machine is done away with as with my invention
the operator may depend upon it that Whenever
15 any jamming of these box ends occurs it will be
called to his attention immediately by the Stop
ping of the machine.
While the drawing of this application does not
show the entire Northrup machine, it is to be
20 understood, as previously mentioned, that the
Northrup patent disclosure is included by refer
ence in the disclosure of this application. It is
also to be understood that the scope of this in
vention is not to be considered as limited to the
25 specific embodiment illustrated herein, as the
safety device of my invention is not only appli
cable to a mechanism for feeding box ends into
an automatic box making machine, but is also
applicable to the feeding of the slats into such
30 machine for forming the sides and bottom, of the
box. It is further applicable to the controlling of
individual mechanisms in various machines in
which a plurality of mechanisms is operated by a
unitary power means for cooperatively achieving
a single result.
One of the particular advantages of this inven
tion is that the individual mechanism is protected
from being damaged by the power means of the
machine, when the individual mechanism jams,
by the severing of the drive connection with this
mechanism and at the same time the destructive
operation of the other mechanisms in the ma
chine, while the jammed mechanism is stopped,
is prevented by the automatic stopping of the uni
tary power means, which in this case is the motor
driving the machine.
What I claim is:
1. In a box nailing machine, the combination
of: means for transmitting an initial feeding
movement to a box part to start the feeding of
Said part into proper relation for assembly with
other box parts; power means for actuating said
feeding means; a torque clutch connecting said
feeding means and said power means, said clutch
being automatically disengaged when thetorque
required for the operation of said feeding means
rises above a given value; and means for stopping
the operation of said machine, said means being
responsive to the throwing out of said torque
clutch to stop said machine.
2. In a box nailing machine, the combination
of: power means for operating said machine;
means for transmitting an initial feeding move
ment to a box part to start the feeding of said
part into proper relation for assembly with other
box parts, said means including a shaft, a torque
clutch mounted on said shaft and said power
means, said torque clutch automatically opening 30
to disconnect said power means from said shaft
when the torque transmitted through said clutch
rises above a given value; means for stopping the
operation of said power means; and means actu
ated by said power means and responsive to the
opening of said clutch to actuate said means for
stopping the operation of said machine.
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