US3613742A - Stop motions for looms - Google Patents

Stop motions for looms Download PDF

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Publication number
US3613742A
US3613742A US803827A US3613742DA US3613742A US 3613742 A US3613742 A US 3613742A US 803827 A US803827 A US 803827A US 3613742D A US3613742D A US 3613742DA US 3613742 A US3613742 A US 3613742A
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United States
Prior art keywords
loom
shuttle
stop motion
sley
signal
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Expired - Lifetime
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US803827A
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English (en)
Inventor
David Ainsworth
Cyril Millward Atkinson
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Northrop Weaving Machinery Ltd
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Northrop Weaving Machinery Ltd
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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

  • M D l3d5l/Q 2 tor 36 associated with the loom crankshaft The det ctor 38 Field of Search ..139/341,336, 1 signals the passage of the shuttle and the detector 36 signals a time in the loom cycle.
  • a simple logic circuit is provided, and the pulses from the References cued two detectors are fed into a bistable system A and then to UNITED STATES PATENTS comparators B and C.
  • the pulses from the comparators are 2,567,751 9 1951 ⁇ Volke 139 341 fed into a Pulse lengthener D, an Output amplifier E and into 2,586,335 2 1952 Howe,.lr. et a1.
  • the conventional stop motion employs a pivoted dagger" below the shuttle box, and lifted by engagement of the shuttle with a swell in the wall of the box, so that it does not engage with a spring-loaded frog on the breastbeam of the loom. If the shuttle does not arrive in correct time, then the dagger is not lifted and consequently it strikes the frog" as the sley moves forward for the beat-up. This turns the frog against its spring loading and the turning of the frog causes the starting handle to move to the ofl position, thus disconnecting the drive to the loom crankshaft and applying the brake.
  • the principal object of this invention is to provide a stop motion for a loom, which will allow a greater part of the loom cycle between faulty picking detection and the point at which the loom must be stopped so that application of the brake is more effective and therefore stresses applied to parts of the loom are reduced.
  • a loom stop motion comprises means for detecting the passage of a shuttle at some position intermediate the shuttle boxes at opposite ends of the sley, comparator means for comparing the time of the shuttle passing the detection position with the loom cycle and control means operative if the comparator signals incorrect timing to arrest the sley.
  • the inventive concept of that of detecting the shuttle speed during its flight and using this detected speed to indicate correct or incorrect picking to control the continuation of the movement of the sley is a basically different approach to the problem than that of the conventional swell-frog-dagger arrangement which only detects the arrival of the shuttle.
  • the invention works on the assumption that if the speed of travel of the shuttle is correct, then it will become properly housed in the receiving shuttle box. It is conceivable that this might not always prove correct, but the chances of incorrect picking if the shuttle travels at the correct speed are remote, since nearly all picking faults originate at the starting end of the shuttle flight.
  • FIG. I is a diagrammatic representation of the shuttle path of a loom
  • FIG. 2 is a collar on the crankshaft of a loom
  • FIG. 3 is a block diagram of a control circuit for a loom
  • FIG. 4 is an electronic control circuit
  • FIG. 5 is a graphical representation of the timing
  • FIG. 6 is a perspective view of part of a stop mechanism for a loom, I
  • FIG. 7 is a front view of a stop mechanism as shown in Figure 6,
  • FIG. 8 is an end view of a stop mechanism as shown in Figure 6,
  • FIG. 9 is a view of a starting handle for the mechanism.
  • FIG. 10 is a representation of a mechanical clutch and brake assembly
  • FIG. 1 there is shown a loom sley 20 with its shuttle boxes 21 and 23 and a race board 22.
  • a shuttle 24 is illustrated in the shuttle box 23.
  • the shuttle is picked to and fro across the sley and at the same time the sley oscillates forwards and backwards to beat up the weft.
  • Two magnetic pickups are fitted to the loom to provide detection of the shuttle flight and comparison with the loom cycle.
  • One of these-a shuttle detector 28 is fitted into the sley 20 with its top flush with the race board 22, and the shuttle 24 for use in the loom is fitted with a magnet 26 to operate the pickup 28.
  • a small permanent magnet disc 26 is fitted into the base of each shuttle 24, so that the shuttle is exactly at the midpoint in its flight when its magnet 26 is over the pickup 28. This condition will apply in both direction of shuttle flight.
  • a second pickup 36-the crankshaft pickup- is fixed to a stationary part of the loom frame, close to the loom crankshaft 32.
  • a collar 30 is fitted on to the crankshaft 32 (as shown in FIG. 2) at this position and a magnet 34 projects radially from the collar 30.
  • the disposition of the crankshaft pickup 36 provides that it is energized by the magnet 34 on the collar 30 once in each revolution of the crankshaft 32, and the collar can be adjusted about the crankshaft axis, so that the timing of the crankshaft pickup operation, relatively to the loom cycle, can be preset.
  • an electrical control box is provided on the loom and this incorporates a transistorized circuit, which is shown in FIGS. 3 and 4.
  • the control circuit comprises a bistable system A, comparators B and C, a pulse-lengthening circuit D an output amplifier E and a control relay F (as shown in FIG. 3).
  • a more detailed diagram of the control circuit is shown in FIG. 4 and has a seven-transistor circuit. The transistors are combined with resistors, capacitors and diodes forming a simple logic and amplification circuit.
  • each comparator B and C from the bistable system A when the pulse arrives at the comparator, must be the same as it was before that pulse changed the bistable system over. This can be achieved, for example, by introducing a delay between the bistable system and the comparator. In the circuit shown in FIG. 4, the delay is provided by diode sinking circuits 50 and 52.
  • the signals from the comparators are fed into the pulselengthening circuit D, and the lengthened output signal from this circuit is amplified by the amplification circuit E and this signal then causes deenergization of the relay F which is energized whilst the loom is running.
  • crankshaft pulse failed, the sequence will also be broken, because the shuttle pulses will not then alternate with crankshaft pulses, and the loom will be stopped.
  • the block A represents a bistable system which is set by the shuttle pulse and reset" by the crankshaft pulse.
  • the comparators shown by blocks B and C, compare the outputs of the bistable system with the incoming pulses, and as previously mentioned the system is so arranged that this comparison takes place before the bistable system is switched over.
  • a signal only appears at the output of either comparator, if the incoming signal is such that its effect would be to switch the bistable to the condition which already exists. For example when a crankshaft pulse appears at the input, the effect is normally to reset the system. If it is already in the reset condition, then a signal will appear at the output of comparator B.
  • the system shown by the blocks D and E causes the loom to be stopped in response to a signal at the output of either comparator, also acts as an amplifier for the output signal.
  • This signal is applied to the normally open relay F, and it will be noted that when the loom is running, the relay will be energized.
  • the output of the bistable system defines which pulse is expected" next (i.e. shuttle or crankshaft, and the arrangement provides that if the last pulse was a shuttle pulse, the next must be a crankshaft pulse and vice versa.
  • FIG. 5 Typical conditions are shown in FIG. 5, in which the lefthand part of the diagram shows three shuttle pulses SP and three crankshaft pulses, CP, whilst the line marked shows the signal obtained at the output of the circuit (i.e. at the output of block E in FIG. 3).
  • the shuttle arrives late at the detection position and the crankshaft pulse 45 precedes the shuttle pulse 44 indicating that the shuttle will not arrive correctly before the beat-up. This produces a zero output indicated at Ov in FIG. 5 which will cause the loom to be arrested.
  • the control system resets automatically so that the loom may be restarted.
  • the relay F is arranged to control a solenoid 162 (see FIG. 6) which forms part of a mechanical system for controlling the driving of the loom. So long as the solenoid 162 remains energized, the loom continues to run, but as soon as the solenoid is deenergized the loom is arrested.
  • the electronic circuit provides a simple logic circuit which will maintain a constant energization of the relay F so long as the two pickups pulse alternately. As soon as there occurs two successive pulses of either pickup without an intervening pulse from the other, the circuit signals a fault and the loom is stopped.
  • the shuttle Taking 0 in the loom cycle as being the position when the cranked parts of the loom crankshaft are vertically above the axis of the crankshaft, the shuttle should arrive at the midpoint in its flight at about 265 and it should be possible to set the crankshaft pickup 36 to operate immediately after this.
  • the brake then has approximately 1 10 of the loom cycle in which to operate before damage would occur. This is a large increase on the approximately 12 of movement available for stopping the loom with the conventional arrangement.
  • the output from the detection system described with reference to FIGS. 1 to 5, is applied to mechanical means, controlling the operation of the loom, as shown in FIGS. 6 to 10.
  • mechanical means controlling the operation of the loom, as shown in FIGS. 6 to 10.
  • FIG. 10 their is shown a combined clutch/brake unit 100 which forms part of the Ioom'driving mechanism.
  • the loom-driving motor is shown at 102, and there is a belt drive 104 to a pulley 106 free to rotate on a shaft 108, which drives the loom.
  • the pulley 106 also acts as the driving member of the clutch.
  • the shaft 108 is joumaled in a stationary member 110 on the loom frame, and this member 110 also acts as a brake.
  • each driven member 112 and 114 there are two driven members 112 and 114 each of which is mounted on a splined part of the shaft 108, so that these members rotate with the shaft.
  • the driven members 112 and 114 are identical, but are mounted back to back as shown.
  • Each has a toggle lever system 118 and the driven members are loaded by springs 120 or 122 towards the brake member 110 and the pulley 106 respectively.
  • a friction lining 116 is provided on the outer face of each driven member.
  • a thrust member 124 pivoted at 126 and engaged between thrust blocks 128 and 130 slidable on the shaft 108.
  • the toggle mechanism is operated to pull the driven member 112 out of engagement with the brake member 110.
  • the driven member 114 is pulled out of engagement with the pulley 106.
  • the sets of springs and 122 push their respective driven members 112 and 114 into engagement with the brake 110 and pulley 106 respectively, but the spring loading is such that the brake is operative and the clutch slips so that the shaft 108 is not driven and the loom is at rest.
  • a clutch connecting rod 184 is connected to the thrust member 124 so that axial movement of the rod causes operation of the thrust member.
  • FIGS. 6, 7 and 9 there is illustrated a setting mechanism which is used to put the clutch into engagement so that drive can be transmitted from the loom-driving motor 102 to the loom crankshaft.
  • the loom has a starting handle carried by a member 132 which has an arm 136.
  • the member 132 is pivoted at 138 on the side frame of the loom, and a light tension spring 137 connected between the arm 136 and the side frame, normally pulls the member 132 into the position shown in FIG. 9, where is engages with an adjustable screw stop 140. This if the off position of the starting handle, and corresponds to the position when the loom is at rest.
  • a boss 133 projects from the member 132 and overlies a lever 134 7 also pivoted at 138, and a connecting rod 142 is pivoted at one end on the lever 134 and at its other end, is pivoted on the depending arm 144 ofa bellcranked operating lever 146 pivoted at 148 on the loom side frame.
  • the starting handle 130 When the starting handle 130 is turned about the pivot 138 in an anticlockwise direction as seen in FIG. 9, it can be brought into a position, where the member 132 engages with an adjustable screw stop 150 fixed on the side frame of the loom, and in doing so, it presses the lever 134 down into the on position of the loom, in which condition, the loom is operative.
  • the chain dotted line 152 in FIG. 9 shows the position of the longitudinal axis of the connecting rod 142 in the on" position and it will be observed that if any axial pull is applied to the connecting rod 142 in this position, it exerts a locking turning moment on the lever 134 because the rod 142 has overcenter of the pivotal axis of that lever.
  • the bellcranked lever 146 has a bifurcated arm 154 to which is pivotally connected the upper end of a catch 156.
  • the latter passes vertically through a slot 158 in a latch 161 attached to the armature 160 of a solenoid 162.
  • a rod 164 attached to the armature 160 extends out through the opposite side of the solenoid 162, through a bracket 166 fixed to the side frame of the loom and terminates in a head 168.
  • a compression spring surrounds the portion of the rod 164 between the head 168 and the bracket 166 and this compression spring urges the armature 160 to the left as seen in FIG. 7, thus tending to pull the catch 156 to the left.
  • a three-armed operating lever 172 (see also FIG. 8) is pivoted on a fixed pin 174, and forms the principal member of an automatic mechanism for operating the clutch and brake mechanism shown in FIG. 10.
  • the operating lever 172 has a short substantially horizontal arm 176, and a boss 178 fixed on this arm 176 is capable of engagement by a shoulder 180 formed on the catch 156, when the latter is pushed re the right as seen in FIG. 7 by energization of the solenoid 162. So long however as the solenoid 162 remains deenergized the spring 170 pulls the armature 160 to the left and so pulls the catch 156 into a position where the shoulder 180 is disengaged from the boss 178.
  • An upwardly extending arm 182 of the operating lever 172 carries at its top end, the pivotal connection for the connecting rod 184, the other end of which is connected to the clutch thrust member 124 (see FIG. 10).
  • a downwardly depending arm 186 of the operating lever 172 is pivoted at its bottom end, to a thrust block 188, the lower end of which is slidable within a cylinder 190 pivoted at 192 on a fixed part of the loom frame.
  • a series of Bellville washers 194 is placed back to back inside the tube 190, in order to provide a powerful compression spring acting between a fixed block (not shown) within the tube 190, and the lower end of the thrust block 188.
  • the disposition of the operating lever 172, and the pivoted tube 190 when the connecting rod 184 holds the thrust member 124 in the position where the brake 110 is engaged by the driven member 112 is shown in full lines in FIG. 8. In this position, of course, the starting handle 130 would be in the off position.
  • the starting handle when the starting handle is moved to the on position, it turns the lever 134, and this exerts a pull through the connecting rod 142, which in turn turns the bellcranked lever 146 about its pivot, depressing catch 156. If the solenoid 162 is energized when the starting handle is depressed, the latch 161 holds the catch 156 in the position such that the shoulder 180 engages with the boss 178, the operating lever 172 will be turned by the downward movement of the catch 156, and willv be brought into the position illustrated in chain dotted lines in FIG. 8.
  • the arrangement of the pivoted tube 190 with its powerful spring 194 can be considered as a servomechanism initiated by the comparatively light force of the brake springs 120 and then amplified by the powerful force of the spring 194.
  • the effect is to produce a very rapid change over from the clutch-engaged position to the brake-engaged position and this produces the necessary stopping of the loom.
  • the loom is then ready to be restarted by hand, and since the solenoid 162 has been reenergized almost immediately (as previously described), it is only necessary for the operative to pull the starting handle into the on position.
  • the mechanism shown in FIGS. 6 to 10 can therefore be considered as a setting mechanism which comprises the linkage between the starting handle 130 and the catch 156 and an automatic operating mechanism which comprises the lever 172 with its associated spring mechanism 194 and the connecting rod 184.
  • the setting mechanism and automatic mechanism are capable of connection or disconnection by the operation of the solenoid 162.
  • a warp stop switch 60 and a manual stop switch 62 are connected in the bistable system as shown, and when either of these is energized, the system is set to expect a crank pulse. Therefore when the shuttle passes the detector 28, the relay will be deenergized and the loom will stop with the shuttle housed in a shuttle box. Thus the system is used to stop the loom correctly on a warp breakage or manual operation of a stop switch.
  • a reset switch 64 is connected to the bistable system as shown, and this switch is positioned on the loom so that it is closed each time the lever 134 returns to the original set position. This has the effect of causing the system to expect a shuttle pulse whenever the loom is started and this is the necessary condition for starting the loom.
  • the logic system is electronic, but it will be appreciated that electrical (relays), pneumatic, fluidic, hydraulic or even mechanical systems could be employed.
  • the shuttle detector could be positioned at some other point along the sley, but whilst that would increase the time available in one direction of shuttle flight, it would lessen it in the other.
  • a loom stop motion for use in a loom having a sley; a shuttle movable between shuttle boxes at opposite ends of said sley, and a loom cyclic drive mechanism comprising first signal-generating means located adjacent the slcy intermediate said shuttle boxes for detecting the passage of the shuttle between said shuttle boxes; second signal-generating means responsive to operation of said cyclic drive mechanism; comparator means for receiving signals from said first and second signal-generating means and adapted to maintain a constant output so long as the first and second signals are received alternately, but to change its output as soon as two like signals are received in succession; and control means connected to said comparator means and operative upon a change in the output signal to arrest the sley.
  • said first signal-generating means includes a magnetic pickup detector carried by the sley and adapted to be operated by a magnet carried by the shuttle.
  • said first signal-generating means includes a proximity switch carried by the sley and adapted to be operated by a magnet carried by the shuttle.
  • said loom drive mechanism comprising a loom crankshaft
  • said second signalgenerating means comprising a magnetic pickup cooperating with a magnet, either the pickup or the magnet being fixed to a part rotatable at the same angular velocity as the loom crankshaft, and the other being fixed on a stationary part of the loom.
  • said loom drive mechanism comprising a loom crankshaft
  • the second signal-generating means comprising a proximity switch cooperating with a magnet, either the switch or the magnet being fixed to a part rotatable at the same angular velocity as the loom crankshaft, and the other being fixed on a stationary part of the loom.
  • a loom stop motion as claimed in claim 9 in which the rotatable part is a collar adjustably fixed on the loom crankshaft.
  • control means comprises a setting mechanism capable of' manual operation and an automatic mechanism capable of holding the loom drive mechanism in either an operative or inoperative position, and a latch mechanism capable of coupling the setting mechanism to the automatic mechanism, so that when so coupled, the setting mechanism can be used to place the loom drive mechanism in the operative condition.
  • a loom stop motion as claimed in claim 14, wherein the servomechanism comprises pivoted means acted upon by spring means and so arranged that the spring means exercises no turning moment so long as the drive mechanism is in the operative condition, but exercises a turning moment on the pivoted means as soon as the drive mechanism changes even slightly from the operative condition.
  • said latch mechanism including a solenoid operated by the output signal from said comparator means, and said loom drive mechanism including a clutch and brake mechanism operated by said automatic mechanism.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US803827A 1968-03-02 1969-03-03 Stop motions for looms Expired - Lifetime US3613742A (en)

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US (1) US3613742A (enrdf_load_stackoverflow)
CH (1) CH498221A (enrdf_load_stackoverflow)
DE (1) DE1910786C3 (enrdf_load_stackoverflow)
GB (1) GB1265313A (enrdf_load_stackoverflow)

Cited By (8)

* 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
US3746054A (en) * 1971-04-22 1973-07-17 E Turner Shuttle boxing and protection stopping means 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
US4100942A (en) * 1975-09-30 1978-07-18 Ruti Machinery Works Ltd. Drive, control and monitoring device for looms
US4250931A (en) * 1979-03-01 1981-02-17 Sulzer Brothers Limited Guide for a weft-picking means
CN109576876A (zh) * 2019-01-31 2019-04-05 山东日发纺织机械有限公司 织机及运输车系统及其定位抱紧装置
CN118065034A (zh) * 2024-04-17 2024-05-24 德州学院 带有自动制动机构的圆织机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH622562A5 (en) * 1977-12-12 1981-04-15 Sulzer Ag Weaving machine

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU158837A1 (enrdf_load_stackoverflow) *
US2567751A (en) * 1950-02-21 1951-09-11 Gen Electric Magnetic shuttle detector
US2586335A (en) * 1949-03-12 1952-02-19 Crompton & Knowles Loom Works Protection for looms
US2753894A (en) * 1953-11-10 1956-07-10 Sidney Blumenthal & Co Inc Loom drive with means for shockless stopping
US2889855A (en) * 1954-06-23 1959-06-09 Singer Mfg Co Loom driving mechanism
US3047030A (en) * 1958-10-15 1962-07-31 Metzler Kurt Device for instantaneous stopping of power looms
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
FR1541187A (fr) * 1967-09-21 1968-10-04 Textilipari Ki Dispositif pour le contrôle de la force de chasse des navettes et de l'entrée de la navette dans la position finale voulue sur les métiers à tisser
US3439716A (en) * 1967-09-29 1969-04-22 Marshall John D Loom stopping device
US3451438A (en) * 1967-05-01 1969-06-24 Z & D Ind Inc High speed loom

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU158837A1 (enrdf_load_stackoverflow) *
US2586335A (en) * 1949-03-12 1952-02-19 Crompton & Knowles Loom Works Protection for looms
US2567751A (en) * 1950-02-21 1951-09-11 Gen Electric Magnetic shuttle detector
US2753894A (en) * 1953-11-10 1956-07-10 Sidney Blumenthal & Co Inc Loom drive with means for shockless stopping
US2889855A (en) * 1954-06-23 1959-06-09 Singer Mfg Co Loom driving mechanism
US3047030A (en) * 1958-10-15 1962-07-31 Metzler Kurt Device for instantaneous stopping of power looms
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
US3451438A (en) * 1967-05-01 1969-06-24 Z & D Ind Inc High speed loom
FR1541187A (fr) * 1967-09-21 1968-10-04 Textilipari Ki Dispositif pour le contrôle de la force de chasse des navettes et de l'entrée de la navette dans la position finale voulue sur les métiers à tisser
US3439716A (en) * 1967-09-29 1969-04-22 Marshall John D Loom stopping device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Electronic Protection for Looms by Victor Sepavich, received by U.S. Patent Office May 9, 1950, copy in GR. 364 *

Cited By (8)

* 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
US3746054A (en) * 1971-04-22 1973-07-17 E Turner Shuttle boxing and protection stopping means for fly shuttle 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
US4100942A (en) * 1975-09-30 1978-07-18 Ruti Machinery Works Ltd. Drive, control and monitoring device for looms
US4250931A (en) * 1979-03-01 1981-02-17 Sulzer Brothers Limited Guide for a weft-picking means
CN109576876A (zh) * 2019-01-31 2019-04-05 山东日发纺织机械有限公司 织机及运输车系统及其定位抱紧装置
CN118065034A (zh) * 2024-04-17 2024-05-24 德州学院 带有自动制动机构的圆织机

Also Published As

Publication number Publication date
DE1910786C3 (de) 1978-04-13
GB1265313A (enrdf_load_stackoverflow) 1972-03-01
CH498221A (fr) 1970-10-31
DE1910786B2 (de) 1977-08-11
DE1910786A1 (de) 1969-11-27

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