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Патент USA US2133031

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Oct. 11, 1938.
v2,133,031 '
Filed Jan. 22, 1937
2 Sheets-Sheet 2
Patented Oct. 121, 1938
" BACK GAUGE iron PAPER. our'rnns
R.‘ Lehman, Dayton,
Ohio, Cleveland,
issignor to Ohio,‘
‘a corporation of Delaware
_ Application January 22, 1937,-Scrial No. 121,725’
5 Qlaims.
(or. 164-559)
This invention'relates to improvements in ‘back
gauges‘) for paper cutters; that is to say, paper
cutters in which ‘a descending cutter blade is
caused “to cut through a stack ‘or pile of sheets
5 I supported upona table against a back gauge.
" Theback ‘gauge of such a machine’ is ordinarily
moved back and forth by. a screw mounted be
table, ‘and carries anut l5'that runs upon a feed
screw ‘I 6y of more or less conventional form. This
screw is mounted infb'earings 'l l and I8 supported
from ‘the under side of the'table. Between the
bearing I8’and collars I9 and 20 fixed to the 5
screw-are"anti>fricti0h bearings 2|, designed to
take vthrush-LA “hand wheel 22 mounted on the
neath the table running through‘ a‘ nut ‘carried forward extremity of vthe ' screw is utilized for
by the ‘back gauge. These . screws are generally ’ manual movement ‘of the back gauge.
10 turned manually by the operator standing‘ at the
front of the machine. In the present case the
feed screw 'is ‘power-driven ‘by a motor which is
On the rear extremity of'screw I6 there is 10
keyed a pulley 23 over which runs a belt 24 that
so ‘connected electrically as ‘to be operable in
isdriven *by'a small :pulle'y 25 on the shaft ‘of an
electrici'inotor 26 designed to run:in either direc
stantaneously in' either direction.
tion. 21 'is asolenoid ?xedly‘ mounted beneath
One of the objects of'the invention is the pro;- > the ‘table and having. a “solid iron armature 28 15
vision of means for so operating ‘the motor. 7
‘ which is 'adaptedto engage a side wall of pulley
Another object ‘is the provision of means ‘for 23Yand exert 'a‘braking effect thereon. The ar
automatically applying a braking action to the Vmature ‘.23 is urged i’orwardly to operative or
feed screw immediately after current to the motor braking position by? a coil spring 29, the tension
20__ is cut off in order that the stopping of the feed of which mayfbelcontrolled by a regulating screw
mechanism may be instantaneous. This is par ' 30. "When solenoid 21 ‘is energized 'theIarmat-ure '
ticularly desirable when the stack vof paper is 28 is withdrawn against the action of spring 29,
being moved up to the line of cut. Under the At 'all other .Ttir'nes the brake is maintained in
control which I have vdevised the back gaugemay
be moved up quickly and‘laccurately to a point‘
' just short of the line of out, after whi'chby
manual‘control the movement may be continuedv
braking position.
. About midway "between thesafe limits of move
ment'of the back gauge’ I3 I mount upon the 25
lower :side of the 'table, or'the frame which sup
slowly until the gauge reaches the precise ‘point : ports it; ‘a bracket 3| in._~which are» supported
front-and rear limit switches 32 and 33 respec
39 ‘Other'obje'cts and features of novelty will ‘ap-V tively. qApair of levers 34 and 35 are so pivoted
‘ pear as>I ‘proceed with the description ‘of that’ to the ‘bracket 31 as to swing in vertical planes 960 0
intersecting the buttons of switches 32 and 33.
‘ embodiment of the invention'which, for the'pur
poses ‘of ‘the present application, vI have illus
These ‘levers are supported upon their respective
v trated'in the accompanying drawings, in which '
C13 5
switch'buttons which are supplied with resilient
Fig. 1 is a plan view of a ‘paper cutter ‘em
bodyingthe invention.
means for holding the switches closed- The lev
Fig. 2 is an elevational view of” the same; ' '
Fig.3 is a wiringdiag'ram illustrating theelec
Vtrical control.
. ers ~34'and~'35 are made of‘such length that when
the gauge l3 reaches its predetermined limit of
motion in either direction it engages. and dee
presses the outer'end of the corresponding lever,
Figs. 4 and Bare detail side elevational and > causing ‘the switch ‘32 ‘or 33, as the case may be,
plan views respectively, on a larger scale, of a. toibe opened. In Fig. 2 the back gauge is shown '
lir‘iiitswitch arm used'in connection with the i-n-' in‘full lines at the;point where it engages lever 34
andl‘opens switchv'32, while the rear limit position
In the drawings I have shown at ID a table -» is'indic'ated in'dotted lines 36 at which point the
45 upon- which the paper to be cut vis'fsupport'ed.
This table is of course mounted upon a suitable
base or frame, not herein‘illustrated. A cutting
stick ‘4H is'mounted in a‘transverse groove ofthe
lever 35>is'1'caused to open switch 33. The limit 45
switches and their operating mechanism are
therefore arranged in-Lone unit assembly.
The’outer ends of the levers 34 and 35‘carry
table, and. 'a cutting knife (not shown) 'is mount
lugsr85which‘5a‘re‘mounted adjustably by means
50’ ed for vertical reciprocation directly over the cut
. OfscreWs-SS-and 81 extending through a slot 88
ting stick. A side ‘guide "I2 may. be provided‘ in :the horizontal portion of vthe lever, the lat
along oneor both side edges of the table- slid-r ter 'being of ‘inverted channel shape. By this
able over the surface-of the table is zthe'usual . means smallvariations in ‘the limit of “travel of
back ‘gauge 13.. 'A portion of the gauge extends the back gauge may be ‘permitted.
55; downwardly through alongitudinalslot-lll in the _ ~An~electric control box 31 is mounted on the 55
16 to a contact 11 of the magnet switch, across 2
front end'of the table in a iocation convenient
for the operator. In this box there are three
push buttons 38, 3S and '46 from which con
ductors arranged in a cable 7 extend rearwardly
to magnetic switches carried; in a box 8, and
thence to motor 25. Conductors extend also
from box 8 in a cable 9 over to the limit switches
22 and as.
that switch to contact 10, through conductor '||,
limit switch 33, conductor 12, coil 13, and con
ductors 14 and 51' back to line wire 42. There
upon,,the operator may release push button 39
without breaking the circuit through coil 13.
Brake-retracting coil 21 is also energized in the
same, manner as before.
Now that magnet
The normal positions of the push buttons 38, switch 15 vis in the up'position, connections are
3'9 and 48 are illustrated in Fig.3. 'The electric made from linewires 4|,1i2 and 43 through con 10
system is so arranged that when push ‘button 38 . ductors 78,19 and 80, magnet switch 15, and
is moved upwardly, as shown in that ?gure,‘ conductors 8], 82 and 83 to the motor, but it will
connections areymade' which start the motor 26 be noted'tliat the‘iarrangementof conductors ‘I9
in the proper direction to move the back gauge and 80 is the reverse of the- arrangement of
forward, and these connections continue only so, conductors?tl and El. The direction of rota
long as the operator keeps his hand on the tion'of motor'26 is therefore the reverse of that
“forward” button. 'On the other hand when in the ?rst instance and the mechanism oper
motion of the back gauge in the reversedirection ates to move the back gauge rearwardly in
is desired, the operator merely touches reverse. I stead of forwardly. This motion will continue
uninterrupted until, rear limit switch 33 is 20
20' button 39, whereupon connections are 'set up to
operate'motor 26 in the opposite direction, and.
opened by the operation of lever 35, unless in'the
these connections are maintained automatically
meantime the operator pushes in stop button
4|]. Either of these things will serve to break
until the back gaugereaches its rearward limit
of motion, or until the operatoripushes stop but
the circuit through coil 13, permitting magnet
switch '55 to drop, and thereby interrupting the 25
current to the motor and to the brake-retract
Reference numerals 4|, 42 and 43 indicate line
wires. From line wire 4| a conductor 44 leads
to a contact 45 of switch 40. From the other
contact 46 of that switch a‘ conductor 41 leads
,30 the two contacts 48 and is of switch 381. This
ing coil 21.
by the operator have been sufficiently stated in
switch has two other contacts 50 and 5|. When
the “forward” button 38 is pushed in an electric
connection is made from conductor 47 through
‘contacts 49 and 5|
The operation of the machine and its control
to. a conductor ‘52 which r
35 leads to a contact 530i limit switch 32. ‘The
other contact 54 of that switch is connected by
a conductor 55 with one end of an electroinagnet
55, from the'other end of which a conductorr5'l'
‘extends to line wire 42. A circuit is thereby set
40 up through electromagnet .56 which raises mag
7 net switch 58. While the magnet switch 58 is
thus in the upTposition, circuits are set up
through conductors 59, 60, and BI from line
wires 4|, 42 and 43 across magnet switch 58 to
'oonductors62, 63 and 54 and to motor 26 for
. imparting ‘rotation theretorin a given direction.
connection with the foregoing description of its 30
construction and of the electrical apparatus em
ployed for actuating it. The machine is capable
of I operation without the expenditure of any con
siderable amount of physical effort, and it will
- be'apparent that by employing the power mech
anism for rapidly moving the gauge until a de
sired setting is approximately reached and then
completing the movement by hand manipulation
of wheel22, cuts may be made in rapid sequence
without any sacri?ce of accuracy.
While in the foregoing description and in'the
accompanying drawings I have described and ii
lustrated more orless in detail one speci?c em
bodiment of the invention, I desire it to be un
derstood that such detailed disclosure is resort 45
edto'primarily for the purpose of complying with
Asisoon as the operator releases push button_ the requirements of the statute, and that the
38, or as soon'as limitswitch 32 is opened by the‘
actuation of lever 34, the circuit through coil 55
50 is broken, magnet switch 58 falls, and the current
to motor 26 is interrupted. During the time
that motor 26 is thus in’ operation current also
passes'through coil 21 by way of conductors G5
and 65 through contact 49, push button 38, con
tact 5|, conductor 52, limit switch 32, conductor
coil 56‘and conductor 51 back to iine wire
The brake armature 28 is'thereby held away
from engagement with pulley
‘ '
' When the desired cuts on a stack of sheets are 7
completed and the operator Wishesto move the
.60. back
gauge rearwardly, preparatory to beginning
another series of cuts, he pushes reverse button
39 whereupon current passeslrfrom line wire él
through conductor 44, across switch 40, through
conductor 47 to contact 48, across'switch 38 to
contact 58 and to a contact 6'! permanently con
nected therewith, then across switch 39 to a con-
tact 68, through a conductor 59' to a contact 10
through-'acOnductOr ?| to rear limit switch 33,
from that switch through a ‘conductor 12 to a
magnet coil 13, and through a conductor 14 and
invention’ is to be limited only by the claims
hereunto appended.
Having thus described my 'invention,'I claim:
1; ina paper cutting machine, a table, a back
gauge movable thereover forwardly and back
wardly, an electric motor arranged to’ drive ‘said
backfgaugein either direction, front and rear
limit switches for opening the circuit of said
motor when the gauge ‘reaches predetermined
forward or rearward ‘positions, a ?xed bracket
arranged intermediate the limits of travel of
the back gauge, and lever meanscarried by the
bracket adapted'to be actuated‘ by the gauge
when it reaches its predetermind. limits of move.
ment, saidv lever means being adapted to‘operate‘
said switches.
' 2. In a paper cutting'machine, a table, a back
gauge movable ‘thereover forwardly and back 65
wardly, an electric motor'arrange’d to drive said
' back gauge in either direction, a ?xed bracket
arranged at an’intermediate point in the length
‘of the ‘table, front and rear limit switches
mounted on said bracket, for interrupting the 70
supply of current to said motor when the gauge
conductor 57 to line wire 42. The energization
reaches a predetermined forward or rearward
of coil 13 raises a magnet switch 15. This
position, and lever means adapted to be actu
switch completes a holding circuit from 7‘contact
6? of the reversing button through a conductor
ated by the gauge'wvhen it' reaches its predeter- ,
mined limits of movement, said lever means be
ing adapted when actuated by the gauge to op
erate one of said switches.
3. In a paper cutting machine, a table, a back
gauge movable thereover forwardly and back
wardly, an electric motor arranged to drive said
back gauge in either direction, front and rear
limit switches for opening thecircuit of said mo-,
tor when the gauge reaches predetermined for
ward or rearward positions, a bracket for sup-'
10 porting said switches at a point between the
forward and rearward limits of travel of the back
gauge, and lever means carried by the bracket
and adapted to be actuated by the gauge when it
reaches its predetermined limits of movement for
15 operating said limit switches.
4. In a paper cutting machine, a table, a back
gauge movable thereover forwardly and back
wardly, an electric motor arranged to drive said‘
back gauge in either direction, front and rear
20 limit switches for opening the circuit of ,said
motor when the gauge reaches predetermined
forward or rearward positions, a ?xed bracket
arranged intermediate .the‘limits of travel of
the back gauge, a pair of levers pivotally mounted
25 on said bracket, one extending‘ forward and the
other extending rearward, each of said levers
being- adapted to be swung on its pivot when the
back gauge reaches one of its predetermined
limit positions, said levers when swung on their
pivotes by the back gauge being adapted to open
the corresponding limit switches.
5. In a paper cutting machine, a table, a. back
gauge movable thereover forwardly and back
wardly, an electric-motor arranged to drive said
back gauge in either direction, front and rear 10
limit switches for opening the circuit of said
motor when the gauge reaches predetermined
forward or rearward positions, a bracket for
supporting said‘switches at a point between the
forward and rearward limits of travel of the 15
back gauge, a pairof levers pivotally mounted
,on said bracket between said limit switches, one
lever extending forwardly and the other rears
wardly from the bracket, each of said levers be
ing adapted to be swung on its pivot by the back
gauge as the latter reaches a limit of movement
in one direction and being adapted during such
swinging movement to engage and open one of
said limit switches.
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