EP0387255B1 - Nähmaschine mit einem fadenwächter - Google Patents

Nähmaschine mit einem fadenwächter Download PDF

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Publication number
EP0387255B1
EP0387255B1 EP88907691A EP88907691A EP0387255B1 EP 0387255 B1 EP0387255 B1 EP 0387255B1 EP 88907691 A EP88907691 A EP 88907691A EP 88907691 A EP88907691 A EP 88907691A EP 0387255 B1 EP0387255 B1 EP 0387255B1
Authority
EP
European Patent Office
Prior art keywords
counter
thread
sewing machine
input
signal
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.)
Expired - Lifetime
Application number
EP88907691A
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German (de)
English (en)
French (fr)
Other versions
EP0387255A1 (de
Inventor
Walter Hager
Edgar Butzen
Günther DENUELL
Kurt Arnold
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.)
GM Pfaff AG
Original Assignee
GM Pfaff AG
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 GM Pfaff AG filed Critical GM Pfaff AG
Publication of EP0387255A1 publication Critical patent/EP0387255A1/de
Application granted granted Critical
Publication of EP0387255B1 publication Critical patent/EP0387255B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
    • D05B59/02—Devices for determining or indicating the length of thread still on the bobbin
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/36—Devices for stopping drive when abnormal conditions occur, e.g. thread breakage

Definitions

  • the invention relates to a sewing machine according to the preamble of claim 1.
  • a thread monitor for a sewing machine which has a counter with a counting, a resetting and a precharging input serving for the input of counting values.
  • the pulses of a pulse generator generating a predeterminable number of pulses each time the main shaft is rotated are fed to the counting input, while a pulse generator driven by thread retraction is connected to the reset input.
  • Each pulse at the reset input resets the counter to an output value. Starting from this value, the counter sums the pulses at the counter input until it is reset by the next reset pulse. If, on the other hand, the counter has counted up to the count value set at the precharge input before the next reset pulse is output, there is a thread fault. The counter then issues a signal that triggers the alarm or the machine stops.
  • the needle thread can advantageously be monitored for consumption and breakage, but in the OS it is conceded that the hook thread on a lockstitch sewing machine cannot be monitored directly but only indirectly via the needle thread due to its consumption. As a result, this thread monitor in connection with such sewing machines is unable to detect faults on Hook thread to react quickly and with sufficient sensitivity.
  • a sewing machine is known, the spool of which has a marking formed by light-dark fields on its flange facing a light source and a light receiver.
  • the marking of the rotating bobbin acts as a pulse generator.
  • the pulse sequence changes, as a result of which the switch-off mechanism of the sewing machine is actuated by electrical or electronic means arranged downstream of the light receiver.
  • thread monitors reacting to the change in the pulse sequence have the disadvantage that a reduction in the machine speed causes a bobbin advance which, despite continued thread withdrawal, can briefly trigger the bobbin stop which triggers the response of the thread monitor.
  • the invention specified in claim 1 is based on the object of designing a generic thread monitor so that it directly monitors the hook thread for a quick and sensitive display.
  • the coil is designed as a reflector for signals that are to be routed from a sensor device to a sensor serving as a receiver, neither the sensor device nor the sensor need be arranged in the immediate vicinity of the coil, which is advantageous due to the limited space in the gripper area .
  • a constant signal from the sensor device can be converted into pulses which are fed to the reset input of the counter in a sequence dependent on the thread consumption.
  • sensors can be used to monitor the coil rotation, and the monitoring can be carried out, for example, optoelectronically, magnetically, electrically or pneumatically.
  • the precharge input of the counter can be used to set the count up to which the counter sums the pulses delivered per stitch formation cycle. When this count is reached a switching process is triggered.
  • the count value should be chosen as low as possible in view of a short reaction time before the sewing machine is stopped. On the other hand, it should not be less than a minimum amount, so that a short standstill of the bobbin due to a low amount of thread does not trigger a malfunction of the thread monitor. Such a standstill is, for example, the result of a bobbin advance, which can occur due to a slight reduction in the machine speed during the sewing operation.
  • an additional counting device is advantageous according to claims 2 and 3, by which the effect of the counter of the main counting device is canceled until the maximum possible thread lot is used up.
  • the value of the at least one additional counting device can be set such that after the thread has been completely used up, the thread count is switched back to the counter of the main counting device as early as possible.
  • a counting device is sufficient, which can be adapted by switching over to the respective state of the sewing machine, such as sewing operation, stopover or thread cutting.
  • the gripper drive shown in FIG. 1 of a first embodiment contains a gripper drive shaft (1) on which a gripper body (2), which is only partially shown, is secured against rotation by a stud screw (3).
  • a bobbin case (4) is mounted in a manner not shown, which bears a central pin (5) on which a bobbin wound with thread (6) is mounted.
  • the coil (6) is provided with a front flange (7) and a rear flange (8), which are connected by a hub (9) which can be plugged onto the center pin (5).
  • the flange (7) has on its outside a marking (11) formed from light-dark fields (10).
  • the bobbin case (4) is designed with an opening (12) for the entry and exit of light signals. These are emitted by a light-emitting diode (13), which is only symbolically indicated, and, after reflection at the marking (11), are fed to a photodetector (14).
  • FIG. 3 shows in a simplified circuit diagram the elements of a control circuit (15) required for the function of the thread monitor.
  • Current flows from the positive pole of a regulated voltage source via the light-emitting diode (13) and a resistor (16) to ground.
  • Current also flows from the positive pole of the voltage source via the photodetector (14) designed as a phototransistor and a resistor (17) to ground.
  • a capacitor (18) is connected to the emitter of the photodetector (14) and is connected to an input (E1) of a counter (21) via an amplifier (19) and an AND gate (20). Together with this counter (21), the elements (17) to (20) form a counting device (22).
  • a negation element (23) is connected to the second input of the AND element (20), to which a pulse (M) emitted at its output is supplied immediately after the drive motor (24) of the sewing machine is switched on.
  • a signal corresponding to the required maximum value can be fed to it via an input (E2).
  • the maximum value can be preselected on a control panel (25) to which the input (E2) is connected.
  • a position sensor (27) which monitors the revolutions of the main shaft (26) is connected to a further input (E3) of the counter (21).
  • This has a light-emitting diode (28) connected to the positive pole of a regulated voltage source, which is connected to ground via a resistor (29) and a photodetector (30) also connected to the positive pole and designed as a phototransistor, which is connected to ground via a resistor (31) is laid on.
  • a disk (32) which is fixed on the main shaft (26) and is designed with an opening (33) for the passage of the light beams. With each pass a pulse (P) is delivered to the input (E3) of the counter (21).
  • the output (A) of the counter (21) is connected to an input of an AND gate (34). At the other inputs of the AND gate (34) are counting devices (35 to 37) connected.
  • the counting device (35) can be controlled by the pulse (M) emitted at the output of the drive motor (24), while the threading device (36) receives a pulse (F) from a thread cutting device (not shown) after thread cutting.
  • the counting device (37) can be activated by a pulse (W) in that the seamstress, after replacing the empty bobbin with a filled one, actuates a corresponding switch on the sewing machine. All three counting devices (35 to 37) are connected to the position transmitter (27) and take up the pulses (P) emitted by it.
  • the individual counting devices (35 to 37) are identical in their construction, each, as shown in FIG. 4, a dynamic element (41) formed from a resistor (38), a capacitor (39) and an amplifier (40) Has flip-flop memory (42) and a counter (43).
  • An input (ZE1) (Fig. 3 and 4) of each counter (35 to 37) is connected to the control panel (25), while at the input (ZE2) the pulses emitted by the sewing machine (M, F or W) and at the input (ZE3) the pulses (P) are recorded.
  • the output (ZA) of the respective counting device (35 to 37) is connected to an input of the AND gate (34).
  • the dynamic element (41) is connected to the input (ZE2) of the respective counting device (35 to 37) and has the effect that the received pulses (M, F or W) are only briefly applied to the input (S) of the memory (42).
  • the other input (S ') of the memory (42) is with the Output (A), the output (Q ') of the memory (42) connected to the reset input (RE) of the counter (43).
  • the output (Q ') is also connected to the output (ZA) of the counter.
  • the output of the AND gate (34) (FIG. 3) is connected to an OR gate (44), to which the counting device (37) is also connected.
  • the output of the OR gate (44) is connected via an amplifier (45) to a display element (46) which is connected to ground via a resistor (47).
  • a switch (49) which is connected to a switch-off device (48) of the drive motor (24) and which drives the main shaft (26) via a V-belt (50).
  • the first arrangement works as follows: When the sewing machine is operating, the light rays of the light-emitting diode (13) fall through the opening (12) of the bobbin case (4) onto the marking (11), are reflected on the marking and, after exiting the opening (12), are fed to the photodetector (14). If the bobbin (6) is rotated as a result of the thread draw during sewing, the light receiver (14) takes up signals of different light intensity in succession. In contrast, when the bobbin comes to a standstill as a result of thread breakage or thread end, a signal of constant light intensity is present.
  • the control circuit (15) of the exemplary embodiment only evaluates the signal when changing from a darker to a lighter field (10) of the marking (11).
  • the thread monitor would also be functional if only the transitions from a lighter to a darker field or if both transitions were evaluated.
  • the photodetector (14) With each such transition, the photodetector (14) becomes conductive and current flows through the resistor (17) to ground.
  • the voltage that builds up is fed to the AND gate (20) via the capacitor (18) and the amplifier (19).
  • the capacitor (18) is advantageously used to filter out direct currents caused by daylight and low-frequency alternating currents caused by sewing light.
  • the drive motor (24) does not emit a pulse (M) to the negation element (23), so that a signal with potential "high”, hereinafter referred to as signal (H), is present at its output.
  • signal (H) a signal with potential "high" hereinafter referred to as signal (H)
  • the counter (21) receives a signal (H) via its input (E1) and is thereby reset to its initial position, the value zero.
  • the counter (21) then begins to sum up the signals arriving at the input (E3) from the position transmitter (27), each signal corresponding to one revolution of the main shaft (26) and thus to an executed stitch.
  • the counter (21) is always reset to zero again by the respective signal received at input (E1) before the maximum value set on control panel (25) and preselected via input (E2) is reached.
  • This value can be found, for example, in that the number of stitches and thus the number of revolutions of the main shaft (26) when the bobbin is full and the smallest on the Sewing machine adjustable stitch length, which are necessary for a rotation of the bobbin (6) from one field (10) to the next, is determined by measurements.
  • the counter (21) counts up to the preselected maximum value and emits a signal (H) at its output (A) to the AND gate (34).
  • the counting devices (35 to 37), which will be discussed in greater detail below, are switched so that the signal (H) is always present at their outputs (ZA) during the sewing operation. This enables the signal (H) of the counter (21) to pass through the AND gate (34) unhindered.
  • the signal actuates the display device (46) and, when the switch (49) is closed, simultaneously the shutdown device (48) which, depending on the version, drives the drive motor (24). for example, switches off immediately or prevents it from restarting after the next stopping process.
  • the drive motor (24) When the drive motor (24) is actuated for the first time after the sewing machine has come to a standstill, for example after the bobbin (6) has been filled up, it outputs the pulse (M) to the negation element (23). As a result, the potential at the output of the negation element (23) changes briefly to "low”, hereinafter referred to as signal (L), so that signals (H) coming from the amplifier (19) and present at the AND element (20) cannot pass .
  • the pulse (M) is fed to the input (ZE2) of the counting device (35) and passes through it into the dynamic element (41).
  • the duration of the pulse (M) is limited so that it is only present for a brief moment at the input (S) of the flip-flop memory (42) and sets its output (Q) to signal (H) .
  • the AND gate (34) blocks and no signals (H) from one of the counting devices (22, 36 and 37) can interrupt the engine running.
  • the reset input (RE) of the counter (43) is connected. As soon as the signal (L) is present at this input, it is reset to zero and begins to count the revolutions of the main shaft (26) via the input (P) until it has reached the maximum value preselected via the input (ZE1). He then outputs a signal (H) to the input (S ') of the memory (42) via its output (A), which causes the signal at its output (Q') and at the output (ZA) of the counter (35) (H) is present.
  • the functioning of the counting devices (36 and 37) corresponds to that of the counting device (35).
  • the counting device (37) must be linked by the OR gate (44) to the other counting devices (22, 35 and 36), since the signal (L.) Is always at the output (ZA) of the counting device (37) during its considerably longer counting interval ) is present.
  • magnets (52) are attached to the outside of the flange (7) of the coil (6) acting as a signal transmitter (51), between which are each provided with a magnet-free field (53).
  • a receiver (54) which reacts to changes in the magnetic field is attached to the front of the bobbin case (4). This is designed as a Hall sensor (55), the connections (FIG. 7) of which are connected to the counting device (22) of the control circuit (15). Since the magnets (52) are advantageously designed as permanent magnets, a signal transmitter can be omitted.
  • the second arrangement works as follows: When the thread is drawn off from the bobbin (6), it is rotated so that the Hall sensor (55) successively records magnetic signals of different intensities. In contrast, when the bobbin comes to a standstill as a result of thread breakage or thread end, a magnetic signal of constant intensity is present. These signals are evaluated in the manner already described by the control circuit (15).
  • a receiver (56) is designed as a proximity switch (57) (FIGS. 8 to 10), which is connected to the counting device (22) via an amplifier (58).
  • the flange (7) of the coil (6) facing the proximity switch (57) and serving as a signal transmitter (59) has projections (60) on its outside.
  • the gap between the outer surface of the flange (7) and the proximity switch (57) changes continuously when the coil (6) rotates. This changes, depending on the design of the proximity switch (57), its inductance or its capacitance. These changes are evaluated in the manner already described by the control circuit (15).
  • the receiver (61) of the thread monitor is a pneumatic ring beam sensor (62) (FIGS. 11 to 14), which is shown enlarged in FIG. 13.
  • the ring jet sensor (62) has a cylindrical housing (63) with an inlet connection (64) and an annular outlet nozzle (65).
  • a tube (66) is fastened inside the housing (63), the free end of which serves as an inlet opening and the fastened end of which serves as an outflow connection (67).
  • the inflow connection (64) is connected via a pressure line (68) to a pressure source (69), the outflow connection (67) via a pressure line (70) to a pneumatic / electrical converter (71). This is connected to the counting device (22) via an amplifier (72).
  • the flange (7) of the coil (6) acting as a signal transmitter (73), is formed with projections (74) on its side facing the ring beam sensor (62).
  • the compressed air flowing in through the inlet connection (64) is deflected in the housing (63) and leaves the ring jet sensor (62) through the outlet nozzle (65). After deflection at the flange (7), the compressed air enters the pipe (66) and leaves the ring jet sensor (62) through the outflow connection (67).
  • the thread monitor according to the invention was explained in the present embodiment with reference to bobbin thread monitors.
  • the arrangement is also suitable for monitoring the needle thread in that the signal transmitter is rotatably arranged in the path of the needle thread and is driven by the latter.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
EP88907691A 1987-10-21 1988-09-03 Nähmaschine mit einem fadenwächter Expired - Lifetime EP0387255B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3735578 1987-10-21
DE3735578 1987-11-21
DE3800717A DE3800717A1 (de) 1987-10-21 1988-01-13 Naehmaschine mit einem fadenwaechter
DE3800717 1988-01-13

Publications (2)

Publication Number Publication Date
EP0387255A1 EP0387255A1 (de) 1990-09-19
EP0387255B1 true EP0387255B1 (de) 1992-12-09

Family

ID=25860950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88907691A Expired - Lifetime EP0387255B1 (de) 1987-10-21 1988-09-03 Nähmaschine mit einem fadenwächter

Country Status (7)

Country Link
US (1) US5018465A (ko)
EP (1) EP0387255B1 (ko)
JP (1) JPH03500612A (ko)
KR (1) KR920000853B1 (ko)
DE (2) DE3800717A1 (ko)
ES (1) ES2010319A6 (ko)
WO (1) WO1989003908A1 (ko)

Families Citing this family (19)

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Publication number Priority date Publication date Assignee Title
DE3818663A1 (de) * 1988-06-01 1989-12-07 Pfaff Ind Masch Fadenwaechter
JP2675902B2 (ja) * 1990-05-22 1997-11-12 ジューキ株式会社 ミシンの下糸残量検出装置
DE4024846C1 (ko) * 1990-08-04 1992-01-02 G.M. Pfaff Ag, 6750 Kaiserslautern, De
WO1992002673A1 (de) * 1990-08-07 1992-02-20 Dürkopp Adler Aktiengesellschaft Vorrichtung zum überwachen des greiferfaden-vorrats einer doppelsteppstich-nähmaschine
US5233936A (en) * 1990-09-07 1993-08-10 The Charles Stark Draper Laboratory, Inc. Method and apparatus for detecting skipped stitches for a chainstitch sewing machine
DE4116788C1 (ko) * 1991-05-23 1992-06-25 G.M. Pfaff Ag, 6750 Kaiserslautern, De
IL106535A (en) * 1993-07-30 1996-10-31 Orisol Original Solutions Ltd Device for use with a bobbin-less coil of thread
US5606926A (en) * 1995-09-22 1997-03-04 Quick Technologies, Inc. Method and apparatus for detecting an aberrational stitch in real time
GB2312685A (en) * 1996-04-30 1997-11-05 Thomas Isaac Passmore Bobbin thread payoff detection device for sewing machines
US6257512B1 (en) * 1998-12-16 2001-07-10 Fil-Tec, Inc. Magnetized pre-wound sideless bobbins
US6092478A (en) * 1999-10-14 2000-07-25 The Singer Company Nv Apparatus and method for monitoring consumption of sewing thread supply
US6585181B2 (en) * 2001-02-27 2003-07-01 Ronald Kronenberger Bobbin assembly with backlash preventing structure
JP2002369990A (ja) * 2001-06-15 2002-12-24 Brother Ind Ltd ミシンの糸切れ検出装置
US6659384B2 (en) 2001-08-21 2003-12-09 J. & P. Coats Limited Pre-wound bobbin with magnetized flange
US20040245364A1 (en) * 2003-06-06 2004-12-09 Ronald Kronenberger Sewing system with thread draw tension adjusting capability and a method of adjusting the thread draw tension
US7987801B2 (en) * 2006-03-28 2011-08-02 Rsg Rombold System Gmbh & Co., Kg Device and method for monitoring a thread wound on a bobbin
US9194684B2 (en) 2014-01-23 2015-11-24 Jonathan DeYaeger System and method for verifying screw threads
DE102019106283A1 (de) * 2018-11-22 2020-06-10 A. Liersch GmbH Vorrichtung und Verfahren zur Überwachung der Abwicklung eines Fadens sowie Nähmaschine
EP3656907B1 (de) * 2018-11-22 2024-06-12 A. Liersch GmbH Vorrichtung und verfahren zur überwachung der abwicklung eines fadens sowie nähmaschine

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DE2045394A1 (de) * 1970-03-01 1971-09-16 VEB Nahmaschinenwerk Wittenberge, χ 2900 Wittenberge Elektronische Schalt und Steuer einrichtung fur Fadenwächter
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Also Published As

Publication number Publication date
KR920000853B1 (ko) 1992-01-30
WO1989003908A1 (fr) 1989-05-05
DE3876634D1 (de) 1993-01-21
JPH03500612A (ja) 1991-02-14
DE3800717A1 (de) 1989-05-11
DE3800717C2 (ko) 1989-09-14
US5018465A (en) 1991-05-28
ES2010319A6 (es) 1989-11-01
KR890701825A (ko) 1989-12-21
EP0387255A1 (de) 1990-09-19

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