EP0810313A2 - Elektronische Unfallverhütungsvorrichtung für elektrische Nähmaschinen - Google Patents

Elektronische Unfallverhütungsvorrichtung für elektrische Nähmaschinen Download PDF

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Publication number
EP0810313A2
EP0810313A2 EP97830243A EP97830243A EP0810313A2 EP 0810313 A2 EP0810313 A2 EP 0810313A2 EP 97830243 A EP97830243 A EP 97830243A EP 97830243 A EP97830243 A EP 97830243A EP 0810313 A2 EP0810313 A2 EP 0810313A2
Authority
EP
European Patent Office
Prior art keywords
block
prevention device
accident prevention
needle
consist
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97830243A
Other languages
English (en)
French (fr)
Other versions
EP0810313A3 (de
Inventor
Gianluca Neri
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.)
NERI - Srl
Original Assignee
NERI - Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NERI - Srl filed Critical NERI - Srl
Publication of EP0810313A2 publication Critical patent/EP0810313A2/de
Publication of EP0810313A3 publication Critical patent/EP0810313A3/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B83/00—Guards or like devices for preventing injury to operator

Definitions

  • This patent application concerns an electronic accident prevention device for sewing machines designed to prevent the fingers of the operator from being accidentally pierced by the needle of the sewing machine.
  • Industrial sewing machines are supplied by electric motors operated by one or more pedals acting as accelerator and brake.
  • these finger-guard rings do not in fact eliminate the above risks altogether in that although their shape does provide a mechanical barrier to placing a finger under the needle, the finger can be placed over the ring and into the dangerous area they delimit.
  • the purpose of this invention is to design an electronic accident prevention device which during sewing detects that the hand has been placed in the danger area and immediately stops the needle which automatically resumes working only when the hand is withdrawn from this area.
  • An additional scope of this invention is to design an electronic accident prevention device of the above kind, which may be also installed on existing sewing machines without the need for special modifications or the intervention of specialised technicians.
  • the device in question consists of sensor devices, detection devices and operating mechanisms; the sensor devices detect the contact with the hand of the operator while the detection devices transmit a control signal to the operating mechanisms which instantaneously stop the needle.
  • the needle may be stopped either by automatically disengaging the clutch of the motor or automatically activating the brake, both of which sewing machines are provided with.
  • the device in question uses a traditionally shaped metal ring as sensor fitted around the needle, said ring being supported by a base which allows the same to be fitted under the sewing head on the support of the pressure foot.
  • the electronic device is designed to stop the needle within several tenths of a millisecond if the finger or the hand of the operator touches the ring.
  • the device in question is based on the fact that the human body with respect to an electric circuit acts as an earthing bridge, contrary to fabrics or leather which are commonly used to make clothing items and which do not behave in this way.
  • block (1) corresponds to the sensor devices consisting of the metal ring (A) shown in fig. 2 fitted on the needle head and insulated from the sewing machine casing.
  • a screened connection cable (2) connects the sensor devices to the detection devices (block 3) consisting of a first high impedance input comparator (block 3A) and a device (block 3B) which regulates the sensitivity of the above comparator.
  • the electric data provided by the detection devices (block 3) are sent to the operating mechanisms (block 4) consisting of a second comparator (block 4A), a timer (block 4B) and a relay (block 4C).
  • the operating mechanisms consisting of a second comparator (block 4A), a timer (block 4B) and a relay (block 4C).
  • the first comparator (3A) When the sensor means are activated by contact with the body of the operator, the first comparator (3A) changes state, thereby activating the second comparator (4A) which controls relay (4C) that activates the brake and disengages the clutch of the sewing machine.
  • Said relay (block 4C) is in fact connected to the motor-clutch-brake unit by means of a special connection box (block SP) which is an integral part of the accident prevention device in question consisting of a plug (block 5) and a socket (block 6).
  • block SP special connection box
  • the plug of the electric connection cable of the motor-clutch-brake unit shown by block (MFF) is connected in socket (5), while plug (5) is connected to the computerised control unit of the machine and to its electric supply shown by block (7).
  • the first comparator (3A) returns to rest position and timer (4B) which activates relay (4C) for several seconds, automatically starts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Control Of Electric Motors In General (AREA)
EP97830243A 1996-05-28 1997-05-26 Elektronische Unfallverhütungsvorrichtung für elektrische Nähmaschinen Withdrawn EP0810313A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITAN960017 1996-05-28
IT96AN000017A IT1286982B1 (it) 1996-05-28 1996-05-28 Sistema elettronico salvadito che eleva enormemente il grado di sicurezza nelle macchine elettriche per cucire

Publications (2)

Publication Number Publication Date
EP0810313A2 true EP0810313A2 (de) 1997-12-03
EP0810313A3 EP0810313A3 (de) 1997-12-10

Family

ID=11333977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97830243A Withdrawn EP0810313A3 (de) 1996-05-28 1997-05-26 Elektronische Unfallverhütungsvorrichtung für elektrische Nähmaschinen

Country Status (2)

Country Link
EP (1) EP0810313A3 (de)
IT (1) IT1286982B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105887374A (zh) * 2016-06-24 2016-08-24 浙江众邦机电科技有限公司 缝纫机及其应用的安全保护装置
US20160289876A1 (en) * 2015-04-02 2016-10-06 Janome Sewing Machine Co., Ltd. Sewing Machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418356A (en) * 1944-07-01 1947-04-01 Jackson O Kleber Safety control device for electrically operated machines
US4075961A (en) * 1976-05-07 1978-02-28 Burlington Industries, Inc. Injury protection device for machinery
US4191122A (en) * 1979-05-16 1980-03-04 The Singer Company Safety stopping device for a sewing machine
DE3641219A1 (de) * 1985-12-03 1987-06-04 Mitsubishi Electric Corp Naehmaschineneinrichtung zur verhinderung des naehens bei unzulaessigen bedingungen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2418356A (en) * 1944-07-01 1947-04-01 Jackson O Kleber Safety control device for electrically operated machines
US4075961A (en) * 1976-05-07 1978-02-28 Burlington Industries, Inc. Injury protection device for machinery
US4191122A (en) * 1979-05-16 1980-03-04 The Singer Company Safety stopping device for a sewing machine
DE3641219A1 (de) * 1985-12-03 1987-06-04 Mitsubishi Electric Corp Naehmaschineneinrichtung zur verhinderung des naehens bei unzulaessigen bedingungen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160289876A1 (en) * 2015-04-02 2016-10-06 Janome Sewing Machine Co., Ltd. Sewing Machine
US9909243B2 (en) * 2015-04-02 2018-03-06 Janome Sewing Machine Co., Ltd. Sewing machine
CN105887374A (zh) * 2016-06-24 2016-08-24 浙江众邦机电科技有限公司 缝纫机及其应用的安全保护装置

Also Published As

Publication number Publication date
IT1286982B1 (it) 1998-07-24
EP0810313A3 (de) 1997-12-10
ITAN960017A1 (it) 1997-11-28
ITAN960017A0 (de) 1996-05-28

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