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Патент USA US3033147

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May 8, 1962
3,033,142
K. WINZ
CONTROL SYSTEM FOR OPERATING A PLURALITY OF SEWING MACHINES
Filed Oct. 9, 1958
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INVENTOR.
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BY
United States Patent O?ice
3,033,142
Patented“ May {8, 1362
2
1
following automatic sewing machines. For this purpose,
3,033,142
there is provided also an impulse switch which is con
nected with the circuit closing electromagnet or relay of
Karl Winz, Kaiserslautern, Pfalz, Germany, assignor to
G. M. Pfatf A.G., Kaisersiautern, Pfaiz, Germany
Filed Oct. 9, 1958, Ser. No. 766,299
Claims priority, application Germany Oct. 14, 1957
of the impulse switch is located,‘after the energization of
the circuit closing relay, in the energizing circuit of the
time switch, a holding circuit being closed through an
(CONTROL SYSTEM FOR OPERATING A PLU
TRALITY 0F SEWING MACHINES
3 Claims. (Cl. 112-219)
each machine in such manner that an operating contact
other contact thereof after operation of the time switch.
The control of the initiation of operation of an auto
The present invention relates, in general, to automatic 10 matic machine is effected by a reversing contact which
operates after the variable time delay of the time con
sewing machines and, in particular, to an apparatus for
controlling the initiation of the operating sequence of a
trolled switch has elapsed.
.
Said reversing contact is located on the side of the res
plurality of sewing machines.
contact in the energizing circuit of the relay for lifting
In sewing machine plants, a single operator may fre
quently have to control the operation of a plurality of 15 the cloth presser foot, and on the side of the working
contact in the energizing circuit of the circuit-closing
automatic sewing machines. He must take care of feed
ing the material to be sewn to the machines, the insertion
of the material into each of the machines, and the subse;
relay. In order ‘to enable the operator to prevent the
automatic initiation of operation of a sewing machine
in case, for example, of unforeseen delays in the inser-,
quent- start of operation of each machine.
If, in addition to the foregoing, he must start the op 20 tion of .the sewing material in the machine, provision is
eration of the machines in a predetermined order or after
a constant or varying time interval, it is apparent that he
made for an emergency switch which can be operated by
the operator whenever necessary. This switch is in the
energizing circuit of the relay which lifts the cloth presser
foot and is independent of the reversing contact of the
It is an object of the present invention to provide
means permitting the automatic control of a plurality of 25 time control switch. In order to provide for the auto
matic disconnection of the time sviu'tch, a circuit breaker,
sewing machines so that the operator need not be con
whose contact is in the holding circuit of the holding cir
cerned with the correct starting sequence thereof and,
cuit of the time switch of its own machine, is in positive
consequently, he can concentrate only on the feed of the
connection with the circuit closing relay in such a way
sewing material and the insertion thereof into the ma
chines.
30 that the holding circuit of the time switch is opened after
the energization of the circuit closing relay. In order to
It is another object of the present invention ‘to pro
insure that each automatic sewing machine is started
vide means permitting the freeing of the operator to per~
only after its cloth presser foot has been lowered into
form the aforesaid duties and which, nevertheless, per
operative disposition, provision is made for a safety
mits for variation in the starting time intervals of the
switch which is so connected with the relay for lifting
various sewing machines.
the cloth presser foot of each sewing ‘machine that a
It is another object of the present invention to provide
rest contact for this safety switch is located'in the ener
means rendering it possible to permit for the provision
cannot perform all of these duties. -
of a time switch which can be in?uenced by a circuit—
gizing circuit of the circuit closingv relay after the relay
has been deenergized.
closing relay of one automatic sewing machine which has
Referring now to the drawing in detail, there is shown
its contacts disposed in the energizing circuit of a second 40
automatic sewing machine.
It is another object of the present invention to provide
the wiring diagram of series of three automatic sewing
machines, it being understood that the present invention
is not limited to three machines and that the number
means permitting the operator to prevent the automatic
thereof may be increased, as desired. In the present in
start of a sewing machine in the event of unforeseen delays
45 stance, the three machines are designated by the reference
in the insertion of the sewing material.
It is another object of the present invention to provide
means ensuring that each automatic sewing machine is
started only after its cloth presser foot has been lowered
characters A, B and C, respectively. Each machine is
provided with a presser foot lifting relay or electromag
net, as shown at 1, 51 and 101, respectively; an energiz
ing circuit closing relay or electromagnet, as shown at
to the operative position thereof.
It is a further object of the present invention to pro 50 3, 53 and 103, respectively; a foot-operated switch for
controlling the associated lifting and closing relays, as
vide for a highly e?‘icient and generally simpli?ed sys
shown at 3, 53 and 103, respectively; and a safety switch
tem for the control of a plurality of automatic sewing
4, S4 and 104, respectively. In order to prevent the cloth
presser foot of each machine from being lifted after the
These and other objects of the invention will become
further apparent from the following detailed description, 55 operation of the machine has been initiated, each ma
chine is provided with a cam which is positively driven
reference being made to the accompanying drawing show
thereby during operation thereof, said cams being indi
ing a preferred embodiment of the invention.
cated by the reference numerals 5, 55 and 105 for the
The sole ‘?gure of the drawing, which represents the
machines.
-
'
best mode presently contemplated of carrying out the in—
machines A, B and C, respectively.‘
Each of the presser foot raising relays 1, 51 and 101
vention, is a schematic wiring diagram of an automatic 60
sewing machine control system according to the present
controls an associated safety switch 6, S6 and 106, re
spectively.
i 7:
invention.
Each safety switch remains open as long as its asso
Pursuant to the present invention, a plurality of dif
ferent switching operations is performed automatically
ciated presser foot raising relay is energized, in order to
through the provision of a time controlled switch which 65 prevent the associated machine from starting before its
cloth presser foot has been lowered into operative dis
is subjected to the control of an electromagnetic relay
utilized to close the circuit of one of the automatic sew
position.
ing machines, said relay having contacts arranged in the
All the presser foot raising relays and all the energiz
ing circuit closing relays are energized from a suitable
energizing circuit of a second automatic sewing machine.
.
It is not necessary that these contacts be located in the 70 D.C. supply which is connected across the terminals
20-21. A DC. power line 7 is connected to the posi
energizing circuit of the adjacent machine, they can, in
addition, effect the initiation of oepration of any of the‘ / tive terminal 20 and a DC. power line '8 is connected to
3,083,142
3
A.
the negative terminal 21. With the lines 7 and 8 sup
plied from the DC. source, the conventional cloth pres
ser foot or bar (not illustrated) of the sewing machine
A is raised in its inoperative position, since the presser
to disengage the contact 60 and engage the contact 73.
The disengagement of contacts 60*61 interrupts the encr
gizing circuit of the presser bar raising relay 51. The re
lay is deenergized so that the associated presser bar is
foot raising relay 1 is enregized by the circuit generally
indicated by the reference charcter I.
$1
Said circuit ex—
lowered and the associated safety switch 56, controlled
by relay 51, is closed. With the reversing contact 61
engaged with the contact 73 there is completed a circuit
which is indicated by the reference character VI for ener
gizing the circuit closing or starting relay 52 for the sew
the engaged contacts 10 of the foot switch 3 to terminal
11 and from the latter to terminal 12 on power line 3. 10 ing machine B as follows: from terminal 71 of DC.
power line 7 through the closed safety switch, through
It will be understood that the safety switch 6 is op
the relay or electromagnet 52, through one contact
erated by the relay 1, said safety switch being open, as
tends from the line 7 through terminal 9, through the lift
ing relay 1, through the closed safety switch 4, through
shown, when the relay is energized.
When the operator actuates the foot switch 3 to open
the contacts 10 and to close the contacts 113, circuit I
is interrupted. This deenergizes the relay 1 so as to
close the safety switch 6. The circuit closing relay 2 is
now connected to power line 7, at terminal 14, through
closed safety switch 6 and to power line 8, at terminal
12, through the foot switch closed at contacts 13. This
circuit is designated by reference character ‘Ii. The au
tomatic sewing machine A is now energized in conven
tional manner and begins to operate. Therefore, it will
be apparent that the depression of the foot switch 3 re
sulted in the lowering of the presser foot and the initia
tion of the operation of the machine. With the machine
in operation, the cam 5 is operated and opens the safety
switch 4. When the operator releases the foot switch 3,
the contacts 10 are again engaged, but the circuit I being
interrupted at safety switch 4 remains deenergized. An 30
impulse switch 15 is operated by the circuit closing relay
72 of the foot switch 53, through the engaged contacts
73-61, to the terminal 63 and from the latter to the
terminal 64 on DC. power line 8.
The relay 52 being energized, the sewing machine B
begins ot operate in conventional manner and the circuit
interrupting switch 67, which is controlled by relay 52, is
opened so that the holding circuit V of the time switch
62 is interrupted and the latter is automatically reset in
known manner. An impulse switch 74 is also operated
by the relay 52 in the same manner as the operation of
the previously described impulse switch 15 by relay 2.
Consequently, upon energization of relay 52, switch 74
closes contacts 75 to energize a time switch 107 of sew
ing machine C to set said time switch running.
Time
switch 107 is connected across the A.C. mains through a
circuit IVA which is similar to circuit IV. Circuit IVA
extends from terminal 66A at the upper A.C. main
through the closed circuit interrupting switch 110,
through the time switch 107, and through the engaged
2. When relay 2 is energized, switch 15 is actuated to
contacts 75 of switch 74 to terminal 69A on the lower
engage the contacts 16.
A.C. main 65. With the time switch 107 energized, its
working contact 108 is closed to provide a holding cir
cuit VA therefor which extends from terminal 66A
through closed switch 108, through the time switch 107
'
With power in the lines 7 and 8, the presser foot lift
ing relay 51 of the sewing machine B is energized through
the circuit III which extends from terminal 57 on line 7,
through relay 51 and the closed safety switch 54 to termi
nal 58, from the latter through the closed contacts 59 of
foot switch 53 to terminal 60, through reversing contact
and its closed contact 108 to terminal 69A on the lower
A.C. main.
After the lapse of the present time period, the switch
61 of a time switch 62, to terminal 63 and from the lat 4-0 107 operates its reversing contact 109 to disengage the
contact 60A and engage the contact 73A so as to energize
ter to terminal 64 on power line 8.
the circuit closing relay 102 of the machine C through
The presser foot raising or lifting relay 101 is ener
the circuit indicated by the reference character VIA.
gized through an identical circuit IIIA which extends
Said circuit may be traced as follows: from terminal 71A
from terminal 57A of power line 7 through relay 101,
closed safety switch 104, terminal 58A, closed contacts 45 at DC. power line 7 through the safety switch 106
59A of foot switch 103 to terminal 60A engaged by the
reversing contact 109 of time switch 107, to terminal 63A
and from the latter to terminal 64A at power line 8.
With the relays 51 and ‘101 energized, the presser bars
(not illustrated) of the machines B and C are raised and
said machines are inoperative.
Upon engagement of the contacts \16 by the impulse
switch 15, as previously described, the time control
switch 62 is connected across the A.C. power lines ‘65
through the circuit identi?ed by the reference charcater
IV, as follows: from terminal 66 on one of the -A.C. lines
which is closed upon deenergization of the relay 101 due
to disengagement of contacts 60A and 109, through the
relay 102 through one contact 72A, through the engaged
contacts 73A-—109, to terminal 63A, and from the latter
to terminal 64A of power line 8. The operation con
tinues, as previously described in connection with ma
chine B, the circuit closing relay 102 operating to open
the switch 110 so as to interrupt the holding circuit VA
for the time switch 107 and said relay also operating,
when energized, to close the impulse switch 111 at the
contacts 112 whereby to connect the time switch of an
the time control switch 62, through the engaged contacts
other sewing machine (not illustrated).
If, during the insertion of the work into the sewing
The time switch being energized closes its working con
tact 70 and remains energized in a holding circuit, iden
to close and to start the machine is insufficient he can
actuate an emergency switch which provides a holding
65, through the closed circuit opening switch 67, through
machine B, for example, the operator notices that the
16 of the impulse switch 15 to terminal 68 and from the
latter to terminal 69 of the other A.C. power line 65. 60 time remaining before operation of the time switch 62
ti?ed by the reference numeral V, as follows: from ter~
minal 66 of the upper A.C. main 65, through the circuit
interrupting switch 67, through the time controlled switch
62, through the closed operating contact 70 to terminal
68 and from the latter to terminal 69 of the lower A.C.
main 65.
Until the elapse of the time interval or period for
circuit for the presser foot, which circuit is independent
of the reversing contact 61 of the time switch 62.
Said emergency holding circuit is indicated by the
reference character VII and may be traced as follows:
from terminal 57 of DC. line 7 through lifting relay
51, through safety switch 54 to terminal 58, through the
closed emergency switch 76 to terminal 63 and from
which the time switch 62, which is of conventional con 70 the latter to terminal 64 of power line 8. As long as the
emergency switch 76 is held closed, the automatic switch
struction, is set to respond, the machine B remains in
ing operations of the time switch 62 remain ineffective.
operative with its presser bar raised so that the operator
Upon release of the closed emergency switch 76 to open
can insert the material into the sewing machine B. After
the preset time has expired, the switch 62 operates in well
‘known manner and its reversing contact 61 is operated
the latter, the machine B is connected over the reversing
contact 61, as previously described. A corresponding
3,033,142
5
emergency switch 113 and corresponding circuit VIIA
are provided in the sewing machine C and operate in
the same manner.
It will be noted that in each machine the correspond
6
.
and a time control switch for at least one machine re
sponsive to starting of the operation of the circuit clos
ing relay of another machine, said last mentioned relay
controlling the closing of open contact means in the
energizing circuit of said time control switch, each ma
ing safety switch 4, 54 and 104, respectively, is opened
chine having a cam operated switch in the energizing
by the corresponding machine operated cam 5, 55 and
circuit of the associated raising relay for deenergizing
105, respectively, upon operation of the associated ma
said relay in response to operation of the associated
chine so that the associated lifting relay 1, 51 and 101,
machine.
respectively, is deenergized to prevent the presser foot
3. A control device for operating a plurality of sew
of the associated machine from being lifted after the 10
ing machines each including means such as a depressable
machine has started.
presser foot connected to means for energizing the sew
Various changes and modi?cations may be made with
ing ‘machine drive to operate the machine, comprising an
electrically energized circuit, relay means in said cir
and modi?cations be embraced by the annexed claims. 15 cuit for raising said presser foot when energized, means
connectable to said sewing machine drive for de-ener
Having thus described the invention, what is claimed
gizing said circuit and said relay means when said sew
as new and desired to ‘be secured by Letters Patent is:
ing machine is operating, a second circuit for operat
l. A system for controlling a plurality of automatic
ing the next machine including time delay means there
sewing machines each having a presser foot; compris
ing a relay for each machine operable to control the 20 in and relay means for raising said presser foot of said
next machine when energized, and means connected to
raising of the respective presser foot thereof, a circuit
said presser ‘foot of said ?rst machine and movable
closing relay for each machine rfor controlling the opera
upon depressing of said presser foot to energize said
tion thereof, a time control switch for at least one ma
out departing from. the spirit and scope of the present
invention and it is intended that such obvious changes
second circuit, said second circuit being opened by said
chine responsive to the operation of the circuit closing
relay of another machine, said last mentioned relay con 25 time delay means until the expiration of a preselected
time, the presser foot of the second machine thereafter
trolling the closing of open contact means in the ener
being effective to initiate operation of said next ma
gizing circuit of said time control switch, each machine
chine upon the manual lowering thereof.
having a safety switch in the energizing circuit of the
circuit closing relay thereof, said safety switch being
operable under the control of the raising relay of the 30
associated machine, and said safety switch being open
during energization of the associated raising relay and
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,465,232
2,494,121
being closed in response to deenergization of the asso
ciated raising relay, whereby the associated machine can~
not be operated until its pressure ‘foot has been lowered. 35 2,650,333
2,688,847
2. Control apparatus for a plurality of automatic sew
2,722,183
ing machines each having a presser foot; comprising a
2,755,394
relay for each machine operable to control the raising
2,811,679
of the respective presser foot thereof, a circuit closing
relay for each machine for starting the operation thereof, 40 2,856,873
Jones et al. ; ________ __ Mar. 22, 1949
Grainger ___________ __ Jan. .10, 1950
Taylor _; ____________ __ Aug. 25,
Harness et a1 __________ __ Sept. 14,
Hayes _______________ __ Nov. 1,
Bivens _______________ __ July 17,
1953
1954
1955
1956
Porter ______________ __ Oct. 29, 1957
Abel ________________ 2. Oct. 21, 195g
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