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Патент USA US2112905

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April 5, 1938- ‘
I
c. H. COOLIDGE
_
2,112,905
SEAM PROTECTING MECHANISM FOR CLOTH SHEARINGIMACHINES
Filed Nov. 25, 1935
2 Sheets-Sheet 1
2,112,965
Patented Apr. 5, 1938
UNlTED STATES PATENT OFFIQE
2,112,905
SEAM PROTECTING MECHANISM FOR
CLOTH SHEARING MACHINES
Charles H. Coolidge, Worcester, Mass, assignor ‘to
Curtis & Marble Machine Company, Worcester,
Mass, a corporation of Massachusetts
Application November 25, 1935, Serial No. 51,460
15 Claims.
This invention relates to machines for shear
ing cloth as a part of the ?nishing thereof. In
such machines as commonly used, the cloth is
drawn between a rapidly rotating shearing cut
5 ter or revolver and some kind of a cloth support
which is normally maintained in close relation
ship to said cutter. In order to lead successive
pieces of cloth through such a machine, the
trailing end of one piece of cloth is usually
10 stitched to the leading end of the next piece of
cloth, thus producing a seam which will not pass
uninjured through the narrow opening between
the revolving cutter and the cloth support.
Various devices have been proposed for tem
15 porarily separating the cutter and cloth support,
but these devices have usually been found unsat
isfactory in certain respects, and the separation
of the cutter and cloth support has been com
monly performed manually by the machine op
20 erator, which necessitates continued attendance
and constant watchfulness.
It is the general object of my invention to pro
vide improved seam. protecting mechanism for a
cloth shearing machine, by which the revolving
25 cutter and the cloth support may be temporarily
and automatically separated under the control of _
the seam, and by the use of which the period of
necessary separation will be made as short as is
operatively possible.
30
A more speci?c object of my invention is to
provide improved means for temporarily and
automatically removing a revolving shearing cut
ter from operative position and for thereafter
returning the same to operative position, all
35 without shock or jar and within a minimum
length of cloth travel.
My invention further relates to arrangements
and combinations of parts which will be here
inafter described and more particularly pointed
40 out in the appended claims.
A preferred form of the invention is shown in
the drawings, in which
Fig. 1 is a side elevation of portions of a cloth
shearing machine embodying my improvements;
45
Fig. 2 is a side elevation of certain additional
parts;
Fig. 3 is an end elevation, partly in section, of
the seam detecting mechanism, and
Fig. 4 is a diagram of certain electrical circuits.
50
Referring to Fig. 1, I have shown portions of
a cloth shearing machine comprising a ?xed
frame H] on which are mounted stands I l at each
side of the machine. Bearing blocks l2 are se
01 a cured to the stands II by clamping bolts l3 and
l
may be adjusted along inclined guideways by ad
justing screws I4.
Arms 15 are pivoted at I6 to the bearing blocks
l2 and rotatably support a cutter or revolver l8,
preferably provided with a plurality of helical
cutting blades 19. The cloth C is drawn through
the machine by winding or feed mechanism (not
shown) and the path of travel of the cloth is de
termined by a series of guide-rolls 20, 2|, 22, 23,
and 24 and by a ?xed cloth support 25 over which
the cloth C is drawn at a relatively sharp angle.
The cutter or revolver I8 is mounted adjacent
the cloth support 25 and may be adjusted relative
thereto by stop screws 21, by which the cutter
may be swung toward or away from the cloth 15
support.
In the operation of the machine above de
scribed, it is necessary to swing the cutter or
revolver I8 away from the ?xed cloth support
whenever a seam S (Fig. 3) in the cloth C ap
proaches the cloth support.
In order to effect this result manually, the ma
chine is commonly provided with foot levers 30
(Fig. 2) secured to a cross shaft 3| pivotally
mounted in the frame 10. The levers 30 are
connected by elongated upright links 32 to the
upper ends of the arms l5 which rotatably sup
port the cutter 18. By downward pressure on
one of the foot levers 30, the cutter may be swung.
away from the cloth support 25 and may be
maintained in such inoperative position for any
desired period.
The parts thus far described are or may be
of the usual commercial construction.
For the purpose of automatically moving the
cutter l8 away from operative position, I have
provided additional power-operated means for
actuating the levers 30 and links 32.
For the accomplishment of this purpose, I pref
erably provide a motor M having a crank arm 40 14:.
(Fig. 2) secured to the motor shaft and slotted
to adjustably receive a crank-pin 4| which ex
tends freely through an elongated slot 42 in one
end of a link 43 which is preferably adjustable as
to length. The lower end of the link 43 is piv
otally connected at 44 to the lower end of one
of the links 32 and to the adjacent end of one
of the foot levers 30.
If the motor M is given a partial anti-clock
wise rotation, the crank-pin 4| will move upward,
causing corresponding upward movement of the
links 32 and swinging the cutter I8 away from.
the cloth support 25.
A seam-detecting device is provided for con
trolling the operation of the motor M, which de- , 55
2
2,112,905
vice preferably comprises a detector bar or roll
shock. In actual operation, my improved mech
anism operates very smoothly and the long and
heavy cutter or revolver is displaced and returned
without occasioning any objectionable jar or vi
bration in other parts of the machine. The pe
riod during which the cutter is out of opera
tive position may be varied by various adjust
ments in the time delay switch mechanism 60“.
The slot 42 in the link 43 provides a lost-motion
50 (Fig. l) suspended by arms 5|, from ?xed
pivots 52 and normally positioned adjacent the
lower guide-roll 2|. A projection 53 (Fig. 3) on
one of the arms 5| engages a plunger 54 in a
detector switch 55. A circuit-closing plate 56
is pressed yieldingly to the left in Fig. 3 by a
spring 5'! and when in left-hand position closes
10
a circuit through the wires 58 and 59. When
the circuit is thus closed through the detector
connection which permits the cutter to be moved 10
manually at any time.
switch 55, a solenoid 60 (Fig. 4) is‘ energized,
which in turn operates through a ‘time delay
switch mechanism 60“ to close a motor-control
Having thus described my invention and the
advantages thereof, I do not Wish to be limited
to the details herein disclosed, otherwise than as
set forth in the claims, but what I claim is:
15
switch BI and start the motor M. The time delay
mechanism forms no part of the present inven
tion and is shown in my prior Patent No.
1. In a cloth shearing machine having a re
volving cutter and an associated cloth support,
in combination, power-actuated means to sepa
rate said parts, and means to apply frictional
resistance to retard the restoration of said parts 20
2,020,877.
The motor M is of the type which has a brake
mechanism incorporated therein which acts di
rectly on the armature shaft, preferably through
a brake drum secured thereto. ‘An electro-mag
netic break release coil 62 is provided in paral
lel with the motor M, so that when the motor is
put in operation, the brake will be released, but
to initial relation under gravity, said retarding
means including connections through which the
force of gravity acts less effectively to overcome
said retarding means as the separated parts ap
proach normal relation.
.25
as soon as the motor circuit is broken, the brake
will be applied.
Having described the details of construction of
2. In a cloth shearing machine having a re
volving cutter and an associated cloth support,
in combination, power-actuated means to sepa
rate said parts, and means to apply frictional re
sistance to retard the restoration of said parts $30
to initial relation under gravity, said retarding,
means applying substantially constant frictional
force and the force of gravity acting less effec
tively to overcome said retarding means as the
my improved seam-protecting mechanism, the
operation and advantages thereof will be readi
30 ly apparent. The cutter l8 and cloth support 25
remain in their normally adjusted relation until
a seam S (Fig. 3) swings the detector bar 5|)
and arms 5| to the left, thus permitting the
spring 5'! to close the detector switch 55, which
cc Li causes the coil 60 to be energized and to effect
separated parts approach normal relation.
\
3. In a cloth shearing machine having a re
volving cutter and an associated cloth support, in
combination, power-actuated means to separate
through the time delay mechanism (illa the clos
ing of the motor control switch 6|.
The motor M then makes a partial anti-clock
wise rotation as indicated by the arrow a in Fig. 2,
moving the crank arm 40 toward the full line
said cutter and support, said parts being there
after restored by gravity to their initial relation,
position shown in Fig. 2 and simultaneously
a seam-detecting device controlling said power
actuated means, and means additional to said
swinging the cutter or revolver 18 away from
the ?xed cloth support 25.
During this movement the coil 62 releases the
brake from the brake drum on the motor shaft,
so that the full power of the motor is available
to lift the cutter IS. The detector bar imme
power-actuated means operative to apply fric
tional resistance to retard the restoration of said
parts under gravity to initial relation, said re 45
tarding means including connections through
which the force of gravity acts less effectively
diately returns to its normal position after the
to overcome said retarding means as the sepa
passage of the seam and again opens the detector
50 switch 55 but the time delay switch mechanism
60a continues its control of the switch 5|. When
the seam is clear, the motor circuit will be bro
ken and the brake release coil 62 will be ren
dered inoperative, thus permitting application of
£35 the brakes to resist the backward rotation of the
motor shaft which will be caused’ by the unbal
anced weight of the cutter I8 and parts asso
ciated therewith. The brake will be adjusted so
that it will resist but not prevent such backward
60 return movement of the motor shaft and con
nected parts.
It should be noted that while the braking ac
tion is substantially constant, the weight of the
cutter I 8 and associated parts is less effectively
exerted against the braking force as the arm 40
approaches the dotted position in Fig. 2 and as
the cutter approaches normal position. 'Conse
quently the braking effect is relatively and pro
gressively increased as the return movement of
the cutter to normal position approaches com
pletion.
My improved seam-protecting mechanism will
accordingly operate to remove the cutter quickly
from cutting position, but will retard the return
movement thereof sufficiently to prevent jar or
rated parts approach normal relation.
'
4. In
a
cloth
shearing machine
having a
revolving cutter and an associated cloth support,
in combination, power-actuated means to sepa
rate said cutter and support, said parts being
thereafter restored by gravity to their initial rela
tion, a seam-detecting device controlling said‘ 55
power-actuated means, and means to apply fric
tional resistance to retard the restoration of said
parts under gravity to initial relation, said fric
tion-applying means being inoperative during the
separation of said parts'by said power-actuated
means, and the force of gravity acting less effec
tively to overcome said retarding means as the
separated parts approach normal relation.
5. In a cloth shearing machine having a
revolving cutter and an associated cloth support,» 65
in combination, power-actuated means to sepa
rate said cutter and support, said parts being
thereafter restored by gravity to their initial rela
tion, a seam-detecting device controlling said
power-actuated means, a brake device, and means
to apply said brake device to retard such move
ment of restoration under gravity and the force
of gravity acting less effectively to overcome said
retarding means as the separated parts approach
normal relation.
3
2,112,905
6. In a cloth shearing machine having a revolv
ing cutter and an associated cloth support, in
combination, power-actuated means to separate
said cutter and support, said parts being there
after restored by gravity to their initial relation, a
seam-detecting device controlling said power-ac
tuated means, a brake device, and means to apply
said brake device to retard such movement of
restoration under gravity, the brake-applying
force being substantially constant but the effec
tiveness of application of gravity to overcome said
retarding means progressively decreasing as the
separated parts approach normal position.
7. In a cloth shearing machine having a revolv
15 ing cutter and an associated cloth support, in
combination, revolvable means to separate said
cutter and support, power means to give said
revolvable means a partial revolution in one di
rection only to separate said cutter and support,
20 said power means being thereafter turned back
ward to initial position by the weight of the con
nected parts as said cutter and support are re
stored to initial relation by gravity, and means to
yieldingly resist such backward return movement
to apply said brake to said power means during
its backward return movement only.
11. In a cloth shearing‘ machine having a
revolving cutter and an associated cloth sup
port, in combination, a revolvable motor effective
to separate said cutter and support by a partial
revolution only of said motor, a seam-detecting
device controlling the operation of said motor,
said motor being thereafter turned backward to
initial position by the weight of the connected 10
parts as said cutter and support are restored to
initial relation, a brake, and means to apply
said brake to said motor during its backward
movement only.
12. In a cloth. shearing machine having a. 15
revolving cutter and an associated cloth support,
in combination, a revolvable motor effective to
separate said cutter and support by a partial
revolution only of said motor, a seam-detecting
device controlling the operation of said motor,
said motor being thereafter turned backward to
initial position by the weight of the connected
parts as said cutter and support are restored to
initial relation, a brake for said motor, and a
25 of ‘said power means.
8. In a cloth shearing machine having a revolv
ing cutter and an associated cloth support, in
magnetic release for said brake, said magnetic 25
release being operative only when said motor is
combination, means to separate said cutter and
support comprising an actuating link, a revolvable
30 crank arm, a crank-pin thereon and an operat
ing connection between said crank-pin and link,
13. In a cloth shearing machine having a
revolving cutter and an associated cloth support,
in combination, an electric motor connected and 30
e?ective to separate said cutter and support, a
brake for said motor, a magnetic release for said
brake, a main electric circuit having parallel
branch circuits for said motor and said magnetic
release, and a seam-detecting device effective to 35
power means to give said arm a partial revolution
in one direction only to separate said cutter and
support, said power means being thereafter
35 turned backward to initial position by the weight'
of the connected parts as said cutter and sup
port are restored to initial relation by gravity,
and means to yieldingly resist such backward re
turn movement of said power means.
9. In a cloth shearing machine having a revolv
ing cutter and an associated cloth support, in com
bination, revolvable means to separate said cutter
and support, power means to give said revolvable
means a partial revolution in one direction only
45 to separate said cutter and support, said power
means being thereafter turned backward to initial
position by the weight of the connected parts as
said cutter and support are restored to initial
relation by gravity, a brake, and means to apply
50 said brake to said power means during its back
ward return movement only.
10. In a cloth shearing machine having a
revolving cutter and an associated cloth sup
port, in combination, power-actuated means to
separate said cutter and support, said means com
prising an actuating link, a revolvable crank arm,
a crank-pin thereon and an operating connection
between said crank-pin and link, power means to
give said arm a partial revolution in one direction
60 only to separate said cutter and support, said
power means being thereafter turned backward to
initial position by the weight of the connected
parts as said cutter and support are restored
to initial relation by gravity, a brake, and means
energized.
control said main circuit, whereby said brake is
rendered inoperative when said motor is rendered
operative and whereby said brake is operative only
when said motor is inoperative.
14. In a cloth shearing machine having a 40
revolving cutter and an associated cloth support,
in combination, a motor effective to separate said
cutter and support by a partial revolution only
of said motor, a seam-detecting device con
trolling the operation of said motor, said motor
being thereafter turned backward to initial posi
tion by the weight of the connected parts as said
cutter and support are restored to initial rela
tion, a brake for said motor, and. a magnetic re
lease for said brake connected in parallel with
said motor, whereby said motor and brake are
rendered‘ alternatively operative.
15. In a cloth shearing machine having a frame
carrying a shearing unit, the combination of
means to move said frame from normal operative 55
position, and means additional to said moving
means and operative to apply frictional re
sistance to control and retard the return move
ment of said frame under gravity to normal posi
tion, said retarding means including connections 60
through which the force of gravity acts less effec
tively to overcome said retarding means as the
separated parts approach normal relation.
CHARLES H. COOLIDGE.
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