US3565126A - Arrangement on a loom for monitoring the weft insertion member - Google Patents

Arrangement on a loom for monitoring the weft insertion member Download PDF

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Publication number
US3565126A
US3565126A US792292*A US3565126DA US3565126A US 3565126 A US3565126 A US 3565126A US 3565126D A US3565126D A US 3565126DA US 3565126 A US3565126 A US 3565126A
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United States
Prior art keywords
arrangement
capacitor
transistor
loom
shuttle
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Expired - Lifetime
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US792292*A
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English (en)
Inventor
Rudolf Schlappi
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Ruti Machinery Works Ltd
Maschinenfabrik Rueti AG
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Maschinenfabrik Rueti AG
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/58—Shuttle guards

Definitions

  • This invention relates to an arrangement for use in a loom for monitoring the movement of the weft insertion member. More particularly, this invention relates to an arrangement having means for generating two transit signals during the movement of the insertion member, e.g., a shuttle, along its flip-flop circuitsis connected to'a "gate" circuit, the conduct- .ing or nonconducting action of which is controlled in dependence upon the time of occurrence of the signals generated by the shuttle.
  • the present invention provides a'rnonitoring arrangement for a weft insertion member which is of simplecons'truction and'in which the measurement of the time spacing of the two signals generated by. the movement of the insertion member takes place as directly as possible.
  • the arrangement of this invention affords ,rnirtimum susceptibility to breakdown and high accuracy 'of measurement.
  • use of this'arrangement allows simple adaptation to different operating conditions such as, for example, different weaving breadths and operating speeds of the loom.
  • this invention contemplates an arrangement for use in a loom for rnonitoring the movement of a shuttle on a path through the loom which'comprisesa'first means for generating two transit signals during movement of the shuttle through the loom, the time interval or spacing between the signals being dependent on and being indicative of the speed of the shuttle, and a second means or device to which the signals are applied and which is actuated by the signals for performing a preset monitoring or control operation; the arrangement further being characterized in that the preset operation includes the production of an indication which'occurs at the end of the completion of the preset operation, in that the first of the two transit signals initiates this operation in each instance, in that the second of the two transit signals interrupts this operation in each instance, and in that the duration of the preset operation is variable.
  • the second means produces the indication which occurs at the end of the completion of the preset operation, is responsive to the first transit signal whereby the first signal initiates the preset operation, is responsive to the second transit signal whereby the second signal interrupts the preset operation, and allows the duration of the preset operation to be variable.
  • FIG. 1 is a diagrammatic side elevation of the left-hand end of the sley of a loom showing a shuttle and the arrangement of the invention particularly the means for generating two transit signals during movement of the shuttle;
  • FIG. 2 is a circuit diagram of the arrangement for monitoring the shuttle movement through the loom.
  • FIG. 1 shows the left-hand side of a sley 1 1.
  • a shuttle or insertion member 14 is periodically shot from left to right by means of the picking stick 12 and the picker 13.
  • One of the swords or sidebars of the heater is denoted by reference numeral l5 and a shuttle box by reference numeral 16.
  • each of the magnets 17 and 18 generates an alternating voltage (Le, a signal) which is set up between the ends of the coil 19.
  • the circuit arrangement illustrated in FIG. 2 is employed.
  • One end of the coil 19 is coupled to the base of the transistor 22 through the rectifier 21.
  • the other end is connected to earth potential, i.e., ground.
  • the emitter electrode of the transistor 22 is also at earth potential and its collector 23 is connected through a resistor 24 to the positive pole of a voltage source.
  • the collector 23 is capacitively coupled to the input of a flip-flop circuit.
  • the flip-flop circuit includes the transistors 25 and 26.
  • the base electrode 27 of the transistor 25 is connected to the collector 30 of the transistor 26 through the resistor 28 connected in parallel with the capacitor 29.
  • the base electrode 31 of the transistor 26 is connected to the collector electrode 34 of the transistor 25 through the resistor 32 connected in parallel with the capacitor 33.
  • the emitter electrodes 35, 36 of the transistors 25 and 26, respectively, are directly connected to earth potential, while the base electrodes 27, 31 are connected to earth potential through resistors.
  • the signals applied through the capacitor 37 pass to one pole of each of the rectifiers 38 and 39.
  • the collector 30 of the transistor 26 is connected through the variable resistor 40 to one pole of the capacitor 41, the other pole of which is groundedzT he collector 30 is also connected to the positive pole of the voltage source through the resistor 42.
  • the resistor 40 is bridged by the series connection of the resistor 43 with the rectifier 44.
  • a series arrangement comprising a rectifier 45 and a second capacitor 46 (which is capacitively coupled through the capacitor 58) is connected in parallel with the capacitor 41.
  • the potential present in relation to earth across the capacitor 41 is connected to the emitter electrode 66 of the unijunction transistor 47, the base electrodes 48, 49 of which are connected through resistors to the positive pole of the voltage source and to earth (or ground), respectively.
  • the electrode 49 is in addition connected to the input of a controllable diode 50 which operates as a self-holding relay.
  • One rectifier electrode of the diode 50 is connected to one terminal of an indicating instrument constructed as a light source 52 and to one terminal of an electromagnet 53. The magnet serves to stop the loom.
  • the other terminals of the elements 52 and 53 may be selectively connected to the positive pole of the voltage source by the switch 51.
  • the shuttle l4 illustrated in FIG. 1 is propelled to and fro over the sley.
  • one transit signal 20 is first generated in the coil 19 by the magnet 18 and another is then generated. by the magnet 17.
  • the time spacing between these transit signals 20 depends upon the speed of the shuttle 14.
  • the variation of such a transit signal 20 is substantially represented by the curve form shown in FIG. 2.
  • the transit signals 20 generate in the output of the transistor 22 a square wave pulse 54, which is converted into the signal 55 by differentiation by means of the capacitor 37.
  • the transistor 26 When the flip-flop circuit is in the inoperative state, the transistor 26 is conductive and the transistor 25 is nonconductive. The negative peak of the signal-55 consequently has no effect on the transistor 25, but renders the transistor 26 nonconductive. Due to this turning-off of the transistor 26 and thus of the current flow therethrough, the voltage at the collector 30 rises. This voltage rise is transmitted through the elements 28, 29 to the base 27 of the transistor 25, whereby the transistor 25 is rendered conductive. As a result of the current flowing in the collector 34 of the transistor 25, the potential of the latter falls and this potential fall is transmitted through the elements 32, 33 to the base electrode 31, so that the transistor 26 remains in its nonconductive state.
  • the capacitor 41 is gradually charged up through the resistor 40.
  • a fraction of the charging energy thus supplied flows through the capacitor 46, which is connected in parallel with the capacitor 41 through the capacitive coupling formed by the capacitor 58.
  • the charging of the capacitor 41 through the resistor 40 consequently forms a preset operation whose duration is varied by variation of the resistance of resistor 40.
  • the charging of the capacitor continues correspondingly longer, i.e., the capacitor is more highly charged.
  • the threshold value of the unijunction transistor 47 is so chosen that it is reached in this event. If this is the case, the transistor 47 becomes conductive and a current supplied by the charging of the capacitor 41 begins to flow through the transistor 47. This current is an indication which occurs at the end of the preset operation. Due to this current, the potential of the electrode 49 becomes more positive and as a result of this rise of potential, the controllable diode 50 in turn becomes conductive. The current thus flowing through the switch S1 and through the magnet 53 actuates the magnet, which is so arranged that actuation thereof renders a mechanism for stopping the weaving loom operative.
  • the charging time of the capacitor 41 thus serves as a comparison value for monitoring the time spacing between the time or transit signals 20 and thus the speed of the shuttle 14. Since, as already described, the capacitor 46 extracts, until it has been completely charged, constantly decreasing quantities of charging energy intended for the capacitor 41, the time necessary to reach the threshold value for the charging capacitor 41 is initially greatest. it decreases with increasing charging of the capacitor 46 and approaches a particular end value.
  • the charging time of the capacitor 41 is therefore variable by the parallel-connected elements 45, 46 in the sense that the time is greatest at the starting of the weaving loom and reaches the end value after a predetennined period of operation. This manner of operation has been found very advantageous because a weaving loom runs somewhat more slowly immediately after starting than in the subsequent continuous operation.
  • the duration of the charging of the capacitor 41 can be varied by giving the capacitor 46 a suitable value, and may thus be accurately adapted to the starting conditions of the weaving loom. It is desirable that the capacitor 46 should not be discharged simply by fortuitous surface leakage currents at thestopping of the weaving loom, and that its discharge should be effected in controlled manner by a circuit actuated with the stop motion of the weaving loom.
  • FIG. 2 also illustrates a second manner of varying the duration of the charging of the capacitor 41, namely, by variation of the resistance of the variable resistor 40.
  • the time for charging the capacitor 41 is increased to a predetermined threshold value or desired value; on the other hand, this time is shortened by reduction of the value of resistance of the resistor 40.
  • variable resistor 40 is particularly advantageous in combination with the lamp 52 serving as an indicating instrument, in that this combination affords, in an extremely simple manner, possible adjustment for accurate monitoring of the shuttle.
  • the switch 51 is connected to the lamp 52 instead of to the magnet 53.
  • the resistor 40 is so varied that the capacitor 41 exactly reaches the threshold value at each passage of the shuttle 14.
  • the unijunction transistor 47 is fired each time this happens, and the lamp 52 is thus lit up in each instance.
  • the resistor 40 is thereafter again varied by a small amount in the sense of an increase in its value, and the switch 51 is changed back to the magnet 53.
  • the resistor 40 employed as regulating member to be provided with a scale which is calibrated in flight times or speeds of the shuttle.
  • the speed of a shuttle is about 5 percent higher at the beginning of its travel than at the end thereof.
  • the adjustment of the regulating member 40 must naturally be suc'has to control-the speed at the end of the path of travel, so that at the beginning of shuttle travel, a small margin exists for the speed variation. If it is desired to'avoid this, the action of the coils may be'interrupted at the beginning or at the end of the travel of the shuttle 14 by corresponding control in step with the operating cycle of the weaving loom.
  • a magnet in the shuttle may act upon two coils mounted in the sley.
  • a capacitive action may be employed instead of an inductive action.
  • two capacitors situated at a predetermined distance apart along the sley would be influenced by the shuttle or by an actuating element present in the shuttle in such manner that their capacitance would be varied on travel of the insertion member past them. The signals set up by the capacitance change would then be applied to the circuit arrangement illustrated in FIG. 2.
  • the charging of the capacitor 41 g is utilized for the predetermined. operation.
  • other action may be utilized to define the time interval.
  • advance of a step-by-step switch which supplies a signal at each complete revolution andin which the number of steps and/or the speed of operation may be varied.
  • mechanical,-regulatable movements are possible which, on
  • completion supply an indication, for example in the form of the movement of a member, which, when operated, either dicating instrument.
  • An arrangement for use in a loom for monitoring the movement of a shuttle comprising'a first means for producing two transit signals during movement of a shuttle on a path through the loom, theftime interval between the signals being dependent upon the speed of the shuttle; and a second means actuated by said signals for 'performinga preset monitoring operation and for producing an indication at the end of said preset monitoring operation, said second means comprising storage means for storing electrical energy; electrical circuit meansresponsiveto said transit signals;,said circuit means, in response to the first transit signal, charging electrical energy to said storage means whereby said preset operation is initiated and, in response to the second transit signal, discharging said storage means whereby said preset operation is interrupted; a signal producing means coupled to said storage means and responsive to the electrical energy stored therein for producing said indication when the electrical energy supplied and stored in said storage means exceeds a given threshold value; and regulating means for varying the speed by which said storage means is charged.
  • said second means includes an indicating means to which the indication is applied for indicating completion of the monitoring operation.
  • said signal producing means comprises a trigger means coupled to said storage means, said trigger means being so adjusted that when the predetermined threshold value is reached, said trigger means is changed over from one state of operation to another state of operation, the other state of operation serving to produce said control electrode in relation to another of its electrodes, said electrodes being connected in parallel with said capacitor and the capacitor having a voltage equal to this predetermined voltagev on reaching its threshold value.
  • said transistor is a unijunction transistor which has an emitter electrode that serves as said control electrode and two base electrodes.
  • said electric circuit means includes a voltage source, two electrical contacts and a switching means
  • said storage means comprises a first capacitor
  • said regulating means includes a resistor
  • said capacitor together with the resistor forming a serigz arrangement situated between said two electrical contacts, one contact being coupled to one pole of the voltage source and the other contact being coupled to the switch means which is controllable in dependence upon the transit signals, whereby said other contact can be selectively electrically connected to said one pole of the voltage source or to ground by said switch means in order to effect charging or discharging of said first capacitor.
  • said switch means means includes a scale which indicates the extent of the variation of the preset operation and which is calibrated in flight times or speeds of the shuttle.
  • circuit means comprises a flip-flop circuit, said flip-flop circuit in one condition successively charging electrical energy to said storage means and in its other condition successively discharging said storage means.
  • the arrangement of claim .1 further comprising means for stopping the loom, the duration of the preset operation being made variable during that period of operation when the loom and a second electrode coupled via the other contact of the series arrangement and through another resistor to said one pole of the voltage source, whereby said 'two electrodes may be conductively and nonconductively connected by the control electrode of the transistor in dependence upon said transit signals.
  • the switch means is formed by one transistor of a flip-flop circuit comprising two transistors and controllable by the transit signals and the potential of the control electrode of one transistor being changed between two values by the operation of the flip-flop circuit, whereby said one transistor becomes alternately conductive and nonconductive between its emitter electrode and its collector electrode.
  • said regulating means also includes a second capacitor and a rectifier connected in series therewith which are connected in parallel with said first capacitor and are capacitively coupled to said first capacitor, the rectifier being conductive in the forward direction of the current supplied by the voltage source.
  • said regulating means includes a rectifier coupled in parallel with said resistor, said rectifier conducting in the opposite direction to the charging current supplied by said electrical circuit means.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US792292*A 1968-02-16 1969-01-21 Arrangement on a loom for monitoring the weft insertion member Expired - Lifetime US3565126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH229168A CH469843A (de) 1968-02-16 1968-02-16 Anordnung an einer Webmaschine zur Überwachung des Schusseintragsorgans

Publications (1)

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US3565126A true US3565126A (en) 1971-02-23

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US792292*A Expired - Lifetime US3565126A (en) 1968-02-16 1969-01-21 Arrangement on a loom for monitoring the weft insertion member

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US (1) US3565126A (es)
BE (1) BE728410A (es)
CH (1) CH469843A (es)
DE (1) DE1907004C3 (es)
FR (1) FR1595353A (es)
GB (1) GB1214433A (es)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3714972A (en) * 1971-06-18 1973-02-06 Singer Co Shuttle boxing detector for fly-shuttle looms
US3757831A (en) * 1971-05-18 1973-09-11 Loepfe Ag Geb Equipment for monitoring the shuttle flight in a loom
US3805849A (en) * 1971-03-03 1974-04-23 Picanol Nv Driving device for weaving looms
US3963060A (en) * 1975-01-21 1976-06-15 Crompton & Knowles Corporation Shuttle drive for a narrow ware loom
US20040011416A1 (en) * 2001-07-23 2004-01-22 Sulzer Textil Ag Sley apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981296A (en) * 1959-11-12 1961-04-25 Crompton & Knowles Corp Electric protection for loom
US3181573A (en) * 1961-07-06 1965-05-04 Loepfe Ag Geb Shuttle control for looms
US3373773A (en) * 1965-07-12 1968-03-19 George H. Balentine Jr. Loom

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2981296A (en) * 1959-11-12 1961-04-25 Crompton & Knowles Corp Electric protection for loom
US3181573A (en) * 1961-07-06 1965-05-04 Loepfe Ag Geb Shuttle control for looms
US3373773A (en) * 1965-07-12 1968-03-19 George H. Balentine Jr. Loom

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805849A (en) * 1971-03-03 1974-04-23 Picanol Nv Driving device for weaving looms
US3757831A (en) * 1971-05-18 1973-09-11 Loepfe Ag Geb Equipment for monitoring the shuttle flight in a loom
US3714972A (en) * 1971-06-18 1973-02-06 Singer Co Shuttle boxing detector for fly-shuttle looms
US3963060A (en) * 1975-01-21 1976-06-15 Crompton & Knowles Corporation Shuttle drive for a narrow ware loom
US20040011416A1 (en) * 2001-07-23 2004-01-22 Sulzer Textil Ag Sley apparatus
US6799609B2 (en) * 2001-07-23 2004-10-05 Sultex Ag Sley apparatus

Also Published As

Publication number Publication date
DE1907004B2 (es) 1975-02-13
DE1907004C3 (de) 1975-09-18
DE1907004A1 (de) 1969-09-18
GB1214433A (en) 1970-12-02
BE728410A (es) 1969-07-16
CH469843A (de) 1969-03-15
FR1595353A (es) 1970-06-08

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