US3891812A - Detector device of thread breakage on a sewing machine - Google Patents

Detector device of thread breakage on a sewing machine Download PDF

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Publication number
US3891812A
US3891812A US461842A US46184274A US3891812A US 3891812 A US3891812 A US 3891812A US 461842 A US461842 A US 461842A US 46184274 A US46184274 A US 46184274A US 3891812 A US3891812 A US 3891812A
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United States
Prior art keywords
thread
sewing
sewing machine
machine
detecting means
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Expired - Lifetime
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US461842A
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English (en)
Inventor
Nerino Marforio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Virginio Rimoldi and Co SpA
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Virginio Rimoldi and Co SpA
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Publication of US3891812A publication Critical patent/US3891812A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors

Definitions

  • the present invention relates to a device for stopping a sewing machine whenever a thread breaks. More specifically, the device in question is preferably to be applied in the case of a sewing machine that is part of an automatic sewing component, but it may be applied to any type of sewing machine whatsoever.
  • the starting of the machine is effected automatically, such as when the piece of material to be sewed covers up a photoelectric cell located in front of the machine, and the stopping of the machine also occurs automatically whenever the photoelectric cell is exposed to view.
  • the partially processed item is then automatically stacked or is sent on to other sewing or finishing units, often at the same working level as the first sewing machine.
  • Known devices for stopping a machine when a thread breaks are designed to cause an instantaneous stopping of the sewing machine and, in the event that the machine is part of an automatic unit, this becomes a disadvantage, since this instantaneous stopping of the machine while the material is still beneath the working parts will prove a hindrance to the performance of any other work cycles in which the unit is involved. Furthermore, the operator will have to take action by removing the material from the machine, all of this entailing considerable loss of time.
  • the purpose of the present invention is to allow the machine to operate, even when the thread is broken, until the material has cleared the working parts completely, more specifically until the machine is shut off automatically in the absence of any more material to work on, thereupon preventing the machine from starting any new sewing operation.
  • the device according to the invention which is characterized by the fact that it consists of devices that are sensitive to the presence or absence of a thread; interrupting devices, triggered by these sensors, which then break the circuit controlling the starting of the sewing machine whenever the thread is broken or absent; devices for excluding the above sensors during the sewing phase of the machine, these being controlled by the same devices that control the starting and stopping of the sewing machine.
  • FIG. I is a view in front elevation of the device according to the invention.
  • FIG. 2 is a plan view of the device in FIG. 1,
  • FIG. 3 is a side view of the device
  • FIG. 4 is a view in perspective of the device.
  • Numeral l in the FIGS. of drawing identifies generally an angular support bracket formed by a vertical wall 2 and a horizontal plane 3.
  • a thread guide 4 for directing a thread 5 from a supply spool (not shown) to a conventional disk tension device 6 that is attached to the vertical wall 2.
  • the horizontal plane 3 is provided with a hole 8 (FIG. 4) through which the thread 5 passes, as well as two holes 9, into which screws (not shown) are inserted so as to attach the bracket 1 to a sewing machine of any type (not shown).
  • a microswitch 10 having a movable contact ll (FIG. I) that is activated by a thread detecting means such as a rod-shaped sensor 12, located above the plane 3.
  • the rod-shaped sensor 12 is disposed so as to make contact with the thread 5 and is held by the thread in the position, as shown in FIG. 4 so that the movable contact II is held away from a stationary contact 13 (FIG. 1), which is connected to a plug 16 and is connected in series with a relay (not shown) that controls the starting of the sewing machine.
  • the movable contact 11 is electrically connected to a positive pole 17 of the plug 16.
  • the rod-shaped sensor 12 is displaced to a rest position, as indicated by the brokenline representation in FIG. 2. In this position, the movable contact 11 is displaced onto a stationary contact 15 of the microswitch 10, which is electrically connected to a warning light 14, located on the horizontal plane 3. The warning light 14 is also electrically connected to a negative pole 18 of the plug 16.
  • the plane 3 includes a projection 19, to which is attached a sensor displacing means or air cylinder 20 having a piston shaft 21, the free erd of which carries a circular plate 22 that is adapted to engage the rodshaped sensor 12 and move it from the position shown in FIG. 4 to that position shown in FIG. 2.
  • the supply of air to the cylinder 20 is controlled by the same device as the one that controls starting and stopping the sewing machine. This could be a photoelectric cell, or it could be any sort of manual control device.
  • the shaft 21 is extended from the cylinder 20 whenever the sewing machine is in operation, but is drawn into the cylinder whenever the machine is turned off.
  • the rod sensor 12 which is biased by a switch means will move to the position indicated by numeral 12a in FIG. 2, and the movable contact 11 will pivot so as to engage the stationary contact 15, causing the warning light 14 to light up and the machine-starting relay to be deactivated.
  • a visual signal will be given by the warning light 14 and the sewing machine will not be able to operate.
  • the machine can only be started when the thread 5 is present which maintains the rod sensor in the position shown in FIG. 4 and the movable contact 11 connected to the stationary contact 13.
  • a solenoid (not shown) is immediately activated and this feeds power to the air cylinder 20, whose shaft causes the circular plate 22 to act in opposition to the rod sensor 12, displacing it from its position of involvement with the thread, as shown in FIG, 4, to the solid line position shown in FIG. 2.
  • This position of the rod sensor 12 still corresponds to the position of the movable contact ll being engaged with the stationary contact 13 of the microswitch l0, and the movable contact, now being in series with the relay that controls machine shutoff, keeps the relay activated and the machine operating.
  • a thread 5 which could be either a needle thread or a looper thread, and one could obviously provide as many sensors 12 as there are threads being used in the sewing machine with all of these sensors being movable by a single air cylinder or by several such cylinders.
  • an electrically operated sewing machine having circuitry for operating the machine depending upon the presence or absence of fabric at the sewing station the combination of means to detect the presence of sewing thread at the sewing station and to cause stopping of the sewing machine only after no fabric is present at the sewing station and after no sewing thread is present, said means comprising, thread detecting means mounted for movement from an inoperative position to a plurality of operative positions, one of said positions being one in which contact between the detecting means and the thread occurs, when thread is present, switching means operated by said thread detecting means to close and to open the operating circuit of the sewing machine, and means for holding said thread detecting means in an operative position when fabric is present at the sewing station and for permitting said detecting means to move to an inoperative position if no thread is present and after all fabric is gone from the sewing station.
  • said detecting means includes a rod-shaped sensor (12) having one end connected to said switching means and the opposite end disposed for engagement by said holding means.
  • said holding means includes an air cylinder (20) having a piston shaft (21) movable to and from engagement with said detecting means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US461842A 1973-05-22 1974-04-18 Detector device of thread breakage on a sewing machine Expired - Lifetime US3891812A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT24370/73A IT987776B (it) 1973-05-22 1973-05-22 Dispositivo di fermata di una mac china per cucire alla rottura di un filo

Publications (1)

Publication Number Publication Date
US3891812A true US3891812A (en) 1975-06-24

Family

ID=11213294

Family Applications (1)

Application Number Title Priority Date Filing Date
US461842A Expired - Lifetime US3891812A (en) 1973-05-22 1974-04-18 Detector device of thread breakage on a sewing machine

Country Status (7)

Country Link
US (1) US3891812A (it)
JP (1) JPS5041652A (it)
DE (2) DE7417893U (it)
ES (1) ES426495A1 (it)
FR (1) FR2230777A1 (it)
GB (1) GB1414588A (it)
IT (1) IT987776B (it)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4102283A (en) * 1976-11-01 1978-07-25 Cluett, Peabody & Co., Inc. Skipped stitch detector for chain stitch sewing machines
US4213556A (en) * 1978-10-02 1980-07-22 General Motors Corporation Method and apparatus to detect automatic wire bonder failure
US4735161A (en) * 1986-10-20 1988-04-05 Sew Simple Systems, Inc. Sewing machine thread breakage detector
US20110143978A1 (en) * 2005-09-22 2011-06-16 Ecolab Silicone lubricant with good wetting on pet surfaces
CN103184665A (zh) * 2013-03-29 2013-07-03 黄站 绣花机报警装置
CN105734863A (zh) * 2016-04-29 2016-07-06 句容市行香光明绣花厂 一种更稳定的改进绣花机提示工装
CN111005168A (zh) * 2019-12-19 2020-04-14 黄应祥 一种绣花机的断线检测装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3142195C2 (de) * 1981-10-24 1984-01-26 Union Special Gmbh, 7000 Stuttgart Bandzuführeinrichtung für Nähmaschinen
GB2143549B (en) * 1983-06-16 1987-01-21 Spencer Wright Ind Inc Tufting machine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483138A (en) * 1947-04-23 1949-09-27 Esther Helen Helmer Automatic accessory for sewing machines
US3168881A (en) * 1961-10-31 1965-02-09 Carter William Co Sewing machine stop motion
US3413794A (en) * 1967-03-28 1968-12-03 Leesona Corp Pneumatic sensing system
US3599585A (en) * 1969-12-22 1971-08-17 Glen H Myrick Automatic controls for sewing machines
US3687095A (en) * 1970-07-01 1972-08-29 Wilbur Jackson Tufting machine stop motion embodying light beam and sensor with triggering circuit responding to yarn breaks
US3783811A (en) * 1968-04-11 1974-01-08 Bergenfield Dev Co Inc Sewing machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483138A (en) * 1947-04-23 1949-09-27 Esther Helen Helmer Automatic accessory for sewing machines
US3168881A (en) * 1961-10-31 1965-02-09 Carter William Co Sewing machine stop motion
US3413794A (en) * 1967-03-28 1968-12-03 Leesona Corp Pneumatic sensing system
US3783811A (en) * 1968-04-11 1974-01-08 Bergenfield Dev Co Inc Sewing machine
US3599585A (en) * 1969-12-22 1971-08-17 Glen H Myrick Automatic controls for sewing machines
US3687095A (en) * 1970-07-01 1972-08-29 Wilbur Jackson Tufting machine stop motion embodying light beam and sensor with triggering circuit responding to yarn breaks

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4102283A (en) * 1976-11-01 1978-07-25 Cluett, Peabody & Co., Inc. Skipped stitch detector for chain stitch sewing machines
US4213556A (en) * 1978-10-02 1980-07-22 General Motors Corporation Method and apparatus to detect automatic wire bonder failure
US4735161A (en) * 1986-10-20 1988-04-05 Sew Simple Systems, Inc. Sewing machine thread breakage detector
US20110143978A1 (en) * 2005-09-22 2011-06-16 Ecolab Silicone lubricant with good wetting on pet surfaces
CN103184665A (zh) * 2013-03-29 2013-07-03 黄站 绣花机报警装置
CN105734863A (zh) * 2016-04-29 2016-07-06 句容市行香光明绣花厂 一种更稳定的改进绣花机提示工装
CN111005168A (zh) * 2019-12-19 2020-04-14 黄应祥 一种绣花机的断线检测装置

Also Published As

Publication number Publication date
GB1414588A (en) 1975-11-19
IT987776B (it) 1975-03-20
FR2230777A1 (it) 1974-12-20
JPS5041652A (it) 1975-04-16
DE7417893U (de) 1978-02-16
DE2424969A1 (de) 1974-12-12
ES426495A1 (es) 1976-07-01

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