US3602268A - Weft stop motion for weaving machines - Google Patents

Weft stop motion for weaving machines Download PDF

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Publication number
US3602268A
US3602268A US792484*A US3602268DA US3602268A US 3602268 A US3602268 A US 3602268A US 3602268D A US3602268D A US 3602268DA US 3602268 A US3602268 A US 3602268A
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United States
Prior art keywords
needle
weft
stop motion
fabric
contact member
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Expired - Lifetime
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US792484*A
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English (en)
Inventor
Oskar Bernath
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Georg Fischer AG
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Georg Fischer AG
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Publication date
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Publication of US3602268A publication Critical patent/US3602268A/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/18—Automatic stop motions
    • D03D51/34—Weft stop motions

Definitions

  • the present invention relates to a weft stop motion for weaving machines of the type in which weft is drawn from supply cones arranged outside the shed of a fabric being woven and a needle monitoring the weft thread so controlled that it is briefly trapped in or woven into the fabric when the weft thread is present, but is not held when the weft thread is absent, and serves then to initiate stopping of the weaving machine at each missing or incomplete pick of weft.
  • PATENJED was] 19m SHEET 1 BF 4 INVENTOR.
  • Stop motions are known in the art (such as that in Swiss Pat. No. 430,612) which are mounted in an immobile part of the weaving machine and the needles of which penetrate into the warp threads between the reed and the beaten-up line or fell of the fabric.
  • Such weft stop motions involve the disadvantage that the needles must additionally take part in a deflection of the weft at that point because, owing to the fabric contraction, the warp threads do not run normally from the reed to the temples.
  • deflections owing to the needle tension or the mass forces of the needle holders, leave traces or imperfections which lower the value of the fabric.
  • a holder firmly attached to the reed or otherwise fixed to move with the lay and reed is provided with a contact member insulated relatively to it and at least one guide which may move substantially vertically in which a needle carrier subject to the action of a spring is actuated by a cam fixedly arranged on the weaving machine frame is adjustable together with a control roller or cam follower and the needle.
  • FIG. 1 is a section of a first embodiment of the weft stop motion according to this invention with the reed and the slay;
  • FIG. 2 is a plan view of the weft stop motion according to FIG. 1 with the cap or covering sheet removed;
  • FIG. 3 is a section of the weft stop motion according to FIGS. 1 and 2, the needle being held by a weft thread;
  • FIG. 4 is a diagram of the arrangement of the electrical switching members in the embodiment according to FIGS. 1-3;
  • FIG. 5 is a diagram of the interaction of switching pulses in the embodiment according to FIGS. 1-4;
  • FIG. 6 is a section of a further embodiment of the weft stop motion according to this invention together with the reed and the slay, and
  • FIG. 7 is a diagram of the interaction of the switching pulses in the embodiment according to FIG. 6.
  • FIG. 1 is a section of the first embodiment of the weft stop motion according to the invention. It shows a reed 5 and a slay comprising the section 1 with a race plate 2 and the reed being clamped by means of bolts 3 and an angle bracket 4. Guided by the reed 5 are the warp threads 6 which form the fabric 8 together with the weft threads 7, the said fabric beginning at the beating-up point or fell 9. Generally indicated are a temple roll 10 with a cover 11.
  • a holder 12 Clamped to the top of the reed 5 by means of screws 13 is a holder 12 which, according to FIG. 2, comprises two side members 14 with a generally vertical guide slot 15 in each. These slots 15 slidably hold a shaft 16 passing through a needle carrier 17 and also carrying a control roller 18. Fixed in a projection 19 of the needle carrier 17 by means of a screw 21 is a needle 20.
  • compression spring 23 forces, via the needle carrier 17, the shaft 16 against a cap or covering sheet25 which prevents it 1 from being displaced beyond a predetermined limit and, on
  • the weft thread 7, which has been inserted in the shed by insertion members (not shown) comes to rest against the reed 5 and comes up against the needle 20 as the latter moves downwards.
  • the downward movement of the needle 20 is achieved by the engagement of the control roller or follower 18 with a cam 32 attached by means of screws 31, to the weaving machine by means of a cam support arm 33 not shown in its entirety. Arm 33 is fixed to some convenient fixed part of the weaving machine.
  • the movement of the control roller 18 is transmitted to the needle 20 by the needle holder 17.
  • FIG. 3 is a section of the weft stop motion, the reed 5 and the slay as it moves away from the beating-up point in the direction of arrow 34; it also shows the needle 20 held between the fabric 8 and the last beaten-up weft thread 7 so that contact between the needle 20 and the contact stop 26 is interrupted. Thus the circuit cannot be completed.
  • This position of the needle is referred to as one in which the needle is woven into the fabric.
  • the return movement of the device in the direction of arrow 34 beyond the position shown in FIG. 3, enables the needle again to pull out upwardly from the fabric 8 and to assume the position according to FIG. 1.
  • FIG. 4 is a diagram of the arrangement of the electrical switching members, a pulse or time limiter 35, known per se in the art, and therefore not described in greater detail, is supplied, by way of example, with a l2-volt AC current via a switch 36 connected to operate with the starting means, a line 37 and a line 38 connected with the source of power at the weaving machine, the latter being grounded. Voltage is brought down to the 12 volts by a suitable transformer.
  • the switch 41 is preferrably a reed switch.
  • the needle 20 is also grounded to the machine as at 38 and connects a line 44 which is the conductor 29 of FIGS. 1, 2 and 3, with the contact stop 26 when contact is established, that is, when the needle is not affected by a pick of weft.
  • Connected to line 37 by a further line 45 is a relay 46. This relay 46 is the element which sets off the stop motion of the weaving machine as a result of the signal at the needle.
  • That current is preferably amplified by a signal amplifier circuit 53.
  • the current signalled by the needle contact at 26 at a time when switch 41 is closed assures a definite amplified signal for a time sufficient to affect relay 46 positively, but not longer than is desired.
  • This part 35 of the circuit is, in effect, a condenser control for the relay. If the needle vibrates or chatters against contact 26, the signal is still effective.
  • FIG. 5 The operation of the system for the embodiment shown in FIGS. 1-4 is illustrated in FIG. 5.
  • the presence of a weft thread 7 is shown, according to FIGS. 3 and 4, by a short break of contact at the needle 20, ie the needle contact has a break period 48. This period starts before switch 41 is closed.
  • the passage of the permanent magnet 40 near the switch 41 produces a closed phase 50 on a theoretical O-line 49 of reed switch contact, the said period corresponding to the length of time the permanent magnet 40 affects switch 41. However, this is shortened by the pulse limiter 35 to a period 51 which is within an open period 49.
  • the open period 48 on the theoretical O-line 47 of needle contact is that of the contact between needle and contact 26. Since with weft present, there is no contact at 20-26, the circuits 35 and 53 are ineffective or the amplifier is not conducting so that the relay is not energized to stop the weaving machine and the latter continues to operate.
  • the needle contact remains closed as indicated by the dotdash line 52 on needle contact line 47, FIG. 5.
  • the pulse limiter or condenser circuit 35 thus becomes operative and the amplifier circuit 53 becomes conductive so as to energize the relay 46 which stops the machine by means (not shown) preferably the regular machine stop motion.
  • FIG. 6 is a side view, partly in section, of the weft stop motion in another embodiment, the parts identical with those of the first embodiment being identified by the same reference numerals.
  • Clamped to the reed 5 by means of bolts 113 is a holder 112 in which a guide channel 115 for a needle carrier 117 is provided and closed by a lid 114.
  • the needle carrier 117 is under the action of a compression spring 123 held by a projection 124 of the lid 114 and which tends to raise the needle carrier 117.
  • Located at the top of the needle carrier 117 on an axle l 16 is a control roller 118.
  • the needle carrier 117 is provided with an axle 119 to which a needle 120 is fixedly attached and which is forced against a needle 120 is fixedly attached and which is forced against a stop 122 on the needle carrier 117 by means of a torsion spring 121.
  • One end of the torsion spring 121 is connected to the axle 119 and the other to the needle carrier 117. Not shown, is a conducting connection from ground (holder 1 12) to the torsion spring 121 so that the needle 120 possesses the same electrical potential as the machine.
  • an insulating member 127 is attached to the stationary holder 112.
  • the insulating member 127 carries a resilient contact member 126 which is contacted by the swung-out needle 120, but is spaced from the needle 120 when it is idle.
  • a line 129 such as a cable, leads from the contact member 126 to the electrical control and switching members.
  • the downward movement of the needle carrier 1 17 with the needle 120 is achieved when the control roller 118 engages with a cam 132 attached by means of bolts 131, to a holder 133 supported on a fixed part of the weaving machine.
  • FIG. 6 shows the operation of the embodiment according to FIG. 6 in terms of the arrangement of the electrical controls, from that of the arrangement shown in FIGS. 4 and 5.
  • FIG. 7 shows the essential differences. The establishment of contact between the contact member 126 and the needle 120 owing to its deflection, i.e. in the presence of a weft thread 7, results in a pulse 107 which is extended to a pulse 108 (indicated in dot-dash lines) by means of the timing or pulsing circuit.
  • the needle moves substantially parallel with the reed dents movement and at a distance of about 2 mm. therefrom. Owing to the direct and permanent arrangement of the needle on the reed 5 guiding the warp threads 6, the needle is not subject to any detrimental lateral forces due to ad 'acent warp threads during the movement of the reed 5 to the eating-up point and during its return. It does not abrade these warp threads.
  • the design according to this invention possesses the advantage that the mass of the moving parts can be and is made very small and that a very small deflecting force is required to produce the control signals. Undesirable marks in the fabric produced are thus avoided, while the weaving machine is effectively stopped upon the absence of weft, especially at the very edge of a fabric woven in this type of machine.
  • circuit disabling means includes a magnetically controlled switch and a pulse limiter.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Woven Fabrics (AREA)
US792484*A 1968-02-28 1969-01-21 Weft stop motion for weaving machines Expired - Lifetime US3602268A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH289868A CH469842A (de) 1968-02-28 1968-02-28 Schussfadenwächter für Webmaschinen

Publications (1)

Publication Number Publication Date
US3602268A true US3602268A (en) 1971-08-31

Family

ID=4244085

Family Applications (1)

Application Number Title Priority Date Filing Date
US792484*A Expired - Lifetime US3602268A (en) 1968-02-28 1969-01-21 Weft stop motion for weaving machines

Country Status (8)

Country Link
US (1) US3602268A (enrdf_load_stackoverflow)
BR (1) BR6906657D0 (enrdf_load_stackoverflow)
CH (1) CH469842A (enrdf_load_stackoverflow)
CS (1) CS160096B2 (enrdf_load_stackoverflow)
DE (1) DE1815213A1 (enrdf_load_stackoverflow)
ES (1) ES364577A1 (enrdf_load_stackoverflow)
FR (1) FR2002740A1 (enrdf_load_stackoverflow)
GB (1) GB1225706A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009737A (en) * 1975-02-28 1977-03-01 Ruti Machinery Works Ltd. Filling thread stop motion device for a loop

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU192681A1 (enrdf_load_stackoverflow) *
US2819737A (en) * 1954-05-07 1958-01-14 Vyzk Ustav Tvarecich Stroju Weft stop motion for weaving looms
US3145739A (en) * 1960-03-09 1964-08-25 Metzler Kurt Weft sensing means
US3260283A (en) * 1962-12-23 1966-07-12 Elitex Sdruzeni Podniku Weft thread control device
US3442301A (en) * 1967-07-27 1969-05-06 Marshall John D Loom stop motion
US3482608A (en) * 1967-03-16 1969-12-09 Elitex Zavody Textilniho Weft stop motion for weaving machines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU192681A1 (enrdf_load_stackoverflow) *
US2819737A (en) * 1954-05-07 1958-01-14 Vyzk Ustav Tvarecich Stroju Weft stop motion for weaving looms
US3145739A (en) * 1960-03-09 1964-08-25 Metzler Kurt Weft sensing means
US3260283A (en) * 1962-12-23 1966-07-12 Elitex Sdruzeni Podniku Weft thread control device
US3482608A (en) * 1967-03-16 1969-12-09 Elitex Zavody Textilniho Weft stop motion for weaving machines
US3442301A (en) * 1967-07-27 1969-05-06 Marshall John D Loom stop motion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4009737A (en) * 1975-02-28 1977-03-01 Ruti Machinery Works Ltd. Filling thread stop motion device for a loop

Also Published As

Publication number Publication date
CH469842A (de) 1969-03-15
FR2002740A1 (enrdf_load_stackoverflow) 1969-10-31
ES364577A1 (es) 1971-02-01
CS160096B2 (enrdf_load_stackoverflow) 1975-02-28
BR6906657D0 (pt) 1973-01-11
GB1225706A (enrdf_load_stackoverflow) 1971-03-24
DE1815213A1 (de) 1969-10-16

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