US2962056A - Weft stop motion for loom - Google Patents

Weft stop motion for loom Download PDF

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Publication number
US2962056A
US2962056A US767997A US76799758A US2962056A US 2962056 A US2962056 A US 2962056A US 767997 A US767997 A US 767997A US 76799758 A US76799758 A US 76799758A US 2962056 A US2962056 A US 2962056A
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United States
Prior art keywords
loom
switch
lay
relay
weft
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
US767997A
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English (en)
Inventor
Frederick W Paul
Victor F Sepavich
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Crompton and Knowles Corp
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Crompton and Knowles Corp
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.)
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Publication date
Application filed by Crompton and Knowles Corp filed Critical Crompton and Knowles Corp
Priority to US767997A priority Critical patent/US2962056A/en
Priority to CH7951759A priority patent/CH393217A/de
Priority to BE583709A priority patent/BE583709A/fr
Application granted granted Critical
Publication of US2962056A publication Critical patent/US2962056A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • D03D51/06—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping
    • D03D51/08—Driving, starting, or stopping arrangements; Automatic stop motions using particular methods of stopping stopping at definite point in weaving cycle, or moving to such point after stopping
    • 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

  • This invention relates to improvements in weft stop mot ons for looms and it is the general object of the invention to provide means for automatically reversing the loom to return the lay to its back center position incident to stopping of the loom by a weft fault.
  • the loom In the operation of the usual weft stop motion the loom is generally stopped slightly before the lay reaches front center. The lay then remains in this position until the weaver can go to the loom to correct the fault. Under such conditions it is necessary for the weaver to reverse the loom by hand until the lay has reached approximately its back center position with the warp shed open so that the defective weft can be removed. It is an important object of the present invention to provide electrical control means for the loom operating in such manner that after the loom has been stopped by the weft stop motion circuits will be brought into play to reverse the loom until the lay is approximately at its back center position so that when the weaver reaches the loom the lay will already be in the right position to permit correction of the weft fault.
  • the loom has a primary driving pulley which will run continuously during any period assigned to loom operation and this pulley is shaft and in this way reverse the crankshaft.
  • lever 17 pivoted at 18 to the support 14.
  • Fig. 1 is a side elevation partly in section of a loom having the invention applied thereto,
  • Fig. 2 is an enlarged plan view looking in the direction of arrow 2, Fig. 1.
  • Fig. 3 is an enlarged vertical section on line 3-3, of
  • Fig. 4 is an enlarged vertical section on line 44, of Fig. 1, showing the drive for the rotary switches,
  • Fig. 5 is an enlarged vertical section on line 44, of Fig. 2, showing part of the electric connections for the primary clutch, i
  • Fig. 6 is a fragmentary detailed elevation lookingin the direction of arrow 6, Fig. 5, showing the lower part of the three collector rings for the electric connections with the primary switch
  • Fig. 7 is a d.agrammatic view of electric circuits used in conn ectiori with the invention, I
  • Fig. 8 is a detailed view showing part of the knockoff lever and the electric switches which it controls, and
  • the loom has a lay driving top crankshaft 4 normally turning clockwise, Fig. 1, and an oppositely fturning bottom shaft 5.
  • Upper and lower gears 6 and 7 secured to the top and bottom shafts respectively cause the top shaft to turn twice as fast as the bottom shaft
  • the lay has a reed 8 and a laybeam 9 formed atjor near its lengthwise center with a well 10 to receive a weft fork 11 of usual construction and operation.
  • the fork - is pivotally connected by a link 12 to a dagger 13 pivotally mounted on the lay' and slidable along the top' surface of a support 14 secured to the breastbeam 15 of the loom.
  • a dagger 13 pivotally mounted on the lay' and slidable along the top' surface of a support 14 secured to the breastbeam 15 of the loom.
  • the driving mechanism for the loom includes an electric motor M mounted on a fixed bracket 20 of the loom.
  • the motor has a pulley 21 driving a belt 22 trained over and driving a primary driving pulley 23.
  • the motor and pulley run continuously during a period of operation assigned to weaving, that is, they do not stop under ordinary loom stoppage conditions.
  • the primary pulley turns freely on a jack shaft 25 suitably mounted for rotation in bearing means 26 mounted on a stand fixed to the loom.
  • a driving pinion 30 fixed to the jack shaft meshes with gear 6 on the crankshaft 4.
  • the crankshaft When the jack shaft is turned it drives the crankshaft which in turn, by its connectors, one of which is shown at 32, moves the lay.
  • the jack shaft will ordinarily turn counterclockwise, Fig. 1.
  • the jack shaft 25 turns in bearings 35 and 36 and has secured on the outer end thereof by nut 37 the hub 38 of a primary clutch disk 39 held to the hubby screws 40.
  • the disk 39 is made of magnetic material to be attracted by a primary electromagnetic clutch 41 secured at 42 to the primary pulley 23.
  • Pulley 23 has a hub 43 turning freely on one of the steps of the jack shaft 25 and has secured to it at 44 a plate or disk 45 to which is secured a secondary electromagnetic clutch 46.
  • the primary pulley 23 is thus seen to have secured to it and turning with it whenever motor M is turning the primary and secondary electromagnetic clutches.
  • a small gear 50 turns freely on another step of the jack shaft and has secured to it a disk 51 of magnetic material for attraction by the secondary clutch 46.
  • a secondary pulley 53 Keyed at 52 to still another step of the jack shaft is a secondary pulley 53.
  • a brake disk 54 of magnetic material secured at 55 to the pinion. This disk is for cooperation with a stationary electromagnetic brake 56 held in fixed position at 57 on the bearing 35.
  • Gear 6 is keyed at 60 to the crankshaft 4 and to the left of it, Fig. 4, there is a gear-pulley unit 61 having a gear 62 meshing with small gear 50 and a pulley 63 driven from the secondary pulley 53 by a belt 64.
  • the unit 61 turns freely by roller bearings 65 on a step of the crankshaft.
  • Unit 61 ordinarily turns opposite to the crankshaft and always turns in the same direction as the jack shaft by reason of pulleys 53 and 63 and belt 64.
  • a sprocket wheel 71 meshing with a chain 72 which extends upwardly to mesh with a second sprocket wheel 73 pinned as at 74, or otherwise secured to, a small cam shaft 75 rotatable in a housing 76 mounted on a support 77 secured at 78 to the loom frame.
  • Sprocket wheels 71 and 73 are the same size so that cam shaft 75 turns at the same rate and in the same direction as the crankshaft, whether the crank shaft be turning in normal forward direction, or temporarily in reverse direction.
  • Fig. 1 Mounted on the front of the loom are two boxes 85 only one of which is shown in Fig. 1. These boxes are mounted one on each end of the loom and contain certain of the switches shown in Fig. 7. Also mounted on the loom is another box 86 which contains other parts of the electric circuitry shown in Fig. 7.
  • normally open switch 97 closes via line 99 and normally closed switch 100 opens via lines 99 and 98
  • relay R2 When relay R2 is excited it closes normally open switch 101 via line 102 to maintain itself excited through lines 103 and 96, and also opens normally closed switch 104 via lines 105 and 106 to open the circuit between line 90 and brake 56 and also closes normally open switch 107 via lines 105 and 108 to close the circuit through line 90 and clutch 41 via line 109, switch 97 being closed.
  • the start button can now be released, since switch 101 closes the holding circuit on relay R2. With the brake 56 off and the clutch 41 on the loom starts up and will run forwardly under normal conditions.
  • lever 17 When a weft fault occurs lever 17 is rocked counterclockwise, Fig. 1, by the dagger 13 as the lay moves forwardly and momentarily opens switch S1 and shortly thereafter closes switch S2.
  • switch S1 opens it breaks the circuit from line 93 through relay R1 to deenergize the latter, whereupon switch S3 opens and disconnects line 93 from the rectifier 91.
  • Switch 101 thereupon opensand relay R2 becomes deenergized, per mitting switch 111 previously open via lines 105 and 28 to close and permitting clutch controlling switch 107 to open and break the circuit through clutch 41 and also permitting switch 104 to close to complete the circuit through brake 56 to stop the loom, switch 139 being closed.
  • Deenergization of relay R1 also permits closure of switch 100 which results in discharge of current from the capacitor C1 through the brake 56 to stop the loom and also through clutch 41 in a reverse direction from the normal current flow derived from the rectifier, resulting in prompt release of clutch disk 39.
  • Winding 88 thereupon attempts to recharge capacitor C1 through single wave rectifier 112, but closure of switch 100 prevents immediate recharge and the voltage drop across relay R5 energizes it with resultant closure of normally open switch S4, whereupon current flows from line 93 through now closed switch 111, wires 113, 114 and 115 through relay R6 back to the rectifier through line 116.
  • Switch 111 is normally held open when relay R2 is alive.
  • Energization of relay R6 acts through line 117 to close normally open switch 118 and through line 119 to close normally open switch 120.
  • Cam controlled switch 121 is closed at this time and will remain closed until the lay next reaches top center. Closure of switch enablescuirent to fiow from line 93 (switch S4 still being closed) through line 122 and relay R1 to line 116, thereby energizing relay R1 with resultant closure of switch S3 and opening of switch 100, whereupon the capacitor is promptly recharged and switch S4 opens.
  • Line 93 is still alive through switch S3.
  • switch S2 which permits current to flow from line 90 through r the manually operable normally 'closed switch 110 through line 125, switch S2, line 126, relay R3, Wire 127 and cam controlled switch S to line 116.
  • Relay R3 thereupon closes holding switch 128 via line 129 and also closes switch 130 via lines 129 and 131.
  • relay R5 becomes deenergized normally closed switch 132, previously controlled via line 133 from relay R5, closes and a circuit is then completed from wire 93 through switches 121 and 118, wire 114, switch 130, line 134, relay R4, switch 132 and switch S5 to line 116.
  • Relay R4 now energized, thereupon closes switch 135 via line 136 and current flows from line 93 through switch 135, line 137 and the secondary or reversing clutch 46 to line 116.
  • Gear 51 is thereupon turned in a reverse direction and acts through unit 61 and secondary pulley 53 to reverse the jack and crankshafts.
  • cam controlled switch S5 opens and relay R4 becomes deenergized, resulting in opening of switch 135 and deenergization of the secondary clutch 46 to arrest further reverse motion of the loom.
  • Deenergization of relay R4 also permits switch 139 to close, thereby energizing brake 56 to hold the lay at back center.
  • the lay reverse operation is now completed and the loom is at rest with relays R1 and R2 both deenergized. The loom will remain in this condition until the weaver arrives to correct the weft fault.
  • a normally closed switch 140 is connected via line 141 to relay R6 which will be energized at this time and will hold switch 140 open so that the righthand end of switch S2 cannot connect with line 126 and relay R3 will therefore not be energized by this second closing of switch S2. The unwanted consequences will therefore not occur.
  • relay R6 becomes 1 deenergized at top center, due to opening of rotary switch 121 and attendant opening of switch 120, as already mentioned, switch 140 will close for the next weft fault stopping operation, but lever 17 will have returned to its normal position with resultant opening of switch S2 before the aforesaid top center and while switch 140 is still open.
  • Fig. 9 The modified form shown in Fig. 9 is manually controlled by the weaver. This figure shows only such parts of the circuit as are necessary for an understanding of the modified form and it is to be understood that all the circuitry shown in Fig. 7 will be the same except for the change shown in Fig. 9.
  • each of the two start buttons 95 will be providedwith a pairof top contacts 145 whieh arenqrmally connected by the switch.
  • Awire 1 46 c onnects the two left-hand contacts 145 of the upper and lower switches 95, wire 147 connects the right-hand upper contact 145 to wire 126, and wire 148 connects the lower right-hand contact with the left-hand contact 149 of switch S2.
  • the closure of switch S2 caused by a bona fide indication of weft fault will connect wires 125 and 126 through the contacts 145 fora desired stopping operation.
  • Fig. 3 and part of Fig. 2 show the collector rings which connect the 3-phase current to the electromagnetic clutches through brushes 31.
  • These collector rings and brushes and their connection with the winding of the clutches are well known in the art and no claim is specifically made for them herein and the showing in Figs. 2 and .5 is for illustrative purposes only; It is to be understood, of course, that'a similar arrangement can, if desired, be used for the winding of brake 56.
  • Details of the cams on shafts 75 have been omitted since cam controls of switches are well understood and it is believed that the showing in Figs. 2 and 4 together with the designations of the rotary'switches shown in Fig. 7 will be understood without further detailed description.
  • Cams 121' and S5, Fig. 4 correspond to timer or rotary switches 121 and S5 respectively.
  • swtches which comprise only two nonconnected parallel lines, such for instance as switch 128, will normally be open but are closed electromagnetically under con: trol of the appropriate relay.
  • the switches which have two parallel lines crossedby a diagonal line, such for instance as switch 111, are normally closed but will be opened electromagnetically when their corresponding relays are energized.
  • p v V z Certain matter shown in Fig. 7 is not essential to the present invention but is used as a matter of convenience.
  • two normally closed switches are in series with switch S1 and relay R1 so that when switch S1 opens the relay R1 is, de-energized.
  • switches may be parts of other stop means on the loom, such for instance as warp stop and protection, both electrically operated.
  • these other parts of the loom When these other parts of the loom are in operating condition their switches will be closed and if either of their switches is open then the loom wouldbe stopped at least at the time when lever 17 can open switch S1.
  • the invention sets forth means for electrically stopping theloorn on occurrence. of a weft fault and automatically reverses the direction of the jack and crank shafts to move the lay back to a position approximatingor at back center, whereupon the timer switch opens. to prevent furtherreverse movementof the loom and the brake is applied to hold the lay in its back center position until theweaver reachesthe loom.
  • driving means for a loom having a reciprocating lay driving means running continuously during a period assigned to loom operation, two mechanisms operably 7 connectible one at a time to said driving means to move the lay, one mechanism being connected to the driving means to drive the loom forwardly during normal operation to move the lay in usual manner for weaving while the other mechanism is in nondriving relation with respect to the loom, and the other mechanism being connectible operatively to the loom to drive the loom r'eversely when said one mechanism is in nondriving relation relative to the loom, weft stop means effective to indicate occurrence of a weft fault, and control means operatively connected between the stop means and said mechanisms effective upon indication of weft fault to disconnect said one mechanism from the driving means and automatically connect said other mechanism to the driving means to cause the latter to drive the loom reversely until the lay has been reversed to approximately its back center position, the loom having a crank shaft to drive the lay and also a jack shaft geared to the crank shaft, and said driving means includes a
  • driving mechanism for a loom havinga recipro eating lay, driving means running continuously during a period assigned to loom operation, two mechanisms operably connectible one at a time to said driving means to move the lay, an'electromagnetic element forming part of each mechanism, one mechanism being "operatively connectible by its element to the driving means to drive the loom forwardly during normal operation to move the lay in usual manner for weaving while the other mechanism is in nondriving relation with respect to the loom, and the other mechanism being operatively connectible by its element to the loom to drive the loom reversely to move the lay the reverse of said usual manner when said one mechanism is in nondriving relation relative to the loom, two electric switches one of which is for the element of said one mechanism and is normally closed and the other of which is for the element of the other mechanism and is normally open, weft stop means effective when indicating a Weft fault to reverse th normal condition of said switches, and electric circuit means connecting said switches and elements energizing the first named element only to cause said one mechanism to
  • circuit means includes electric connections effective when the loom is restarted subsequent to reversing and with no Weft in the warp shed to prevent reversal of the condition of said switches by the weft stop means from stopping the loom.
  • preventing connections include a manually operable switch which prevents stopping of the loom if held closed until the lay next reaches its approximate top center position.
  • circuit means includes a third switch in series with the switch of the second mechanism and this third switch remains open until the lay reaches approximately its top center position after being restarted subsequent to a reversal of the loom.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US767997A 1958-10-17 1958-10-17 Weft stop motion for loom Expired - Lifetime US2962056A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US767997A US2962056A (en) 1958-10-17 1958-10-17 Weft stop motion for loom
CH7951759A CH393217A (de) 1958-10-17 1959-10-16 Antriebsvorrichtung an einem Webstuhl
BE583709A BE583709A (fr) 1958-10-17 1959-10-16 Mécanisme d'arrêt de trame pour métiers à tisser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US767997A US2962056A (en) 1958-10-17 1958-10-17 Weft stop motion for loom

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US2962056A true US2962056A (en) 1960-11-29

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US767997A Expired - Lifetime US2962056A (en) 1958-10-17 1958-10-17 Weft stop motion for loom

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BE (1) BE583709A (de)
CH (1) CH393217A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332451A (en) * 1965-07-12 1967-07-25 Crompton & Knowles Corp Loom takeup let-back mechanism
US3405740A (en) * 1963-09-20 1968-10-15 Alsacienne Constr Meca Drive and control system for looms
US3568727A (en) * 1967-05-01 1971-03-09 Livermore Corp H F Loom stopping system
US3805850A (en) * 1972-06-09 1974-04-23 Maschf Te Strake L Nv Control device for repairing weaving defects in a pneumatic weaving machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1576285A (en) * 1924-04-08 1926-03-09 Landry Adolphus Henry Loom bunter
US2148700A (en) * 1936-01-31 1939-02-28 Schorch Werke A G Mechanism for stopping electrically driven looms
US2556751A (en) * 1948-02-11 1951-06-12 Fumat Ets Loom clutch and stop mechanism
US2753894A (en) * 1953-11-10 1956-07-10 Sidney Blumenthal & Co Inc Loom drive with means for shockless stopping

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1576285A (en) * 1924-04-08 1926-03-09 Landry Adolphus Henry Loom bunter
US2148700A (en) * 1936-01-31 1939-02-28 Schorch Werke A G Mechanism for stopping electrically driven looms
US2556751A (en) * 1948-02-11 1951-06-12 Fumat Ets Loom clutch and stop mechanism
US2753894A (en) * 1953-11-10 1956-07-10 Sidney Blumenthal & Co Inc Loom drive with means for shockless stopping

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405740A (en) * 1963-09-20 1968-10-15 Alsacienne Constr Meca Drive and control system for looms
US3332451A (en) * 1965-07-12 1967-07-25 Crompton & Knowles Corp Loom takeup let-back mechanism
US3568727A (en) * 1967-05-01 1971-03-09 Livermore Corp H F Loom stopping system
US3805850A (en) * 1972-06-09 1974-04-23 Maschf Te Strake L Nv Control device for repairing weaving defects in a pneumatic weaving machine

Also Published As

Publication number Publication date
CH393217A (de) 1965-05-31
BE583709A (fr) 1960-04-19

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