US3805849A

US3805849A - Driving device for weaving looms

Info

Publication number: US3805849A
Application number: US00229779A
Authority: US
Inventors: B Steverlynck
Original assignee: Picanol NV
Current assignee: Picanol NV
Priority date: 1971-03-03
Filing date: 1972-02-28
Publication date: 1974-04-23
Anticipated expiration: 1991-04-23
Also published as: DE2208387A1; ES400419A1; DE2208387C3; GB1369516A; BE763697A; DE2208387B2; FR2128385A1; FR2128385B1; SU499817A3; DE7206636U

Abstract

The invention pertains to a driving device for weaving looms, consisting in a flywheel driven by a motor, between this flywheel and a shaft, an electromagnetic coupling and between this shaft and the loom crank-sfat proper, a planetary drive, the crankshaft carrying the satellite cog-wheels.

Description

United States Patent [191 Steverlynck [111 3,805,849 L451 Apr. 23, 1974 1 DRIVING DEVICE FOR WEAVING LOOMS [75] Inventor: Bernard Charles-Louis Steverlynck,

leper, Belgium [73] Assignee: Weeiautomater Picanol, Noamloze Vennootschap, leper, Belgium [22] Filed: Feb. 28, 1972 21 Appl. No.: 229,779

[30] Foreign Application Priority Data Mar. 3, 1971 Belgium 763697 [52] US. Cl 139/1 R, 139/336, 139/341 [51] Int. Cl. D03d 51/02, D03d 51/40 [58] Field of Search 139/1 R, 1 E, 336, 341

[56] References Cited I UNITED STATES PATENTS 2,753,894 7/1956 Lovshin et al 139/1 E 3,570,550 3/1971 Bndzyna 139/] R 3,181,573 5/1965 3,565,126 2/1971 3,613,742 10/1971 Ainsworth 139/341 FOREIGN PATENTS OR APPLICATIONS 1,541,187 8/1968 France 139/341 538,575 3/1922 France 139/1 E Primary Examiner-James Kee Chi Attorney, Agent, or Firm-Richards and Geier; V. Alexander Scher [57] ABSTRACT The invention pertains to a driving device for weaving looms, consisting in a flywheel driven by a motor, between this flywheel and a shaft, an electromagnetic coupling and between this shaft and the loom cranksfat proper, a planetarydrive, the crank-shaft carrying the satellite cog-wheels. r

7 Claims, 5 Drawing Figures DRIVING DEVICE FOR WEAVING LOOMS This invention covers a driving device for weaving looms.

It is notorious that conventional looms with flywheel and brake mounted directly on the crank-shaft bring about a good many problems, more particulary due to the vibrations to which the drawer is subjected. Such vibrations are chiefly ascribable to the slowing-down of the crank-shaft when the thrust occurs, which results in deflections of the drawer track superposing themselves to the normal deflections caused by the to an fro motion of the drawer. Considering that the shuttle leans against the reet during its thrust, the aforesaid vibrations cause untimely deviations in the run of the shuttle. This reduce the weaving speed quite considerably.

In conventional looms it is also very difficult to achieve a stoppage of the loom before the front dead point, for instance after detecting a warp or pick rupture, owing to the inertia of the driving device and of the mechanical connections between the controllers and the brake. It was therefore customary to use very stronly prestressed brakes.

This and also other drawbacks are ruled out by the present invention. To this end a driving device is presented which consists essentially of a flywheel driven by a motor; between this flywheel and a shaft, an electromagnetical coupling; and between this shaft and the loom crank-shaft proper, a planetary drive, in which the crank-shaft carries the satellite cogwheels.

According to an adequate execution alternative of this device, it is further completed by a brake and a planetary drive, which enables to achieve a back run at reduced speed.

Such an alternative execution is described below for information purposes,with reference to the attached drawings.

Herein:

FIG. 1, shows half in lateral view and half in axial section a driving device according to the invention;

FIG. 2 shows a programming drum in axial section;

FIG. 3 shows a block-diagram of the sterring unit;

FIG. 4 shows a block-diagram of the capacity unit, and

FIG. 5 shows a diagram of the shuttle control mount- The steering device shown in the drawings consists of a coupling proper, a programming drum, a steering unit and a capacity unit. These constitutent parts are described hereunder one by one, with specification of their working.

Coupling In the common housing 1 with central shaft 2, a free rotating flywheel 3, driven by the loom motor 3a via belts 4, is set up. This flywheel 3 is directly connected with a rotor 5, which rotates with a slight air cleft around a fixed coupling spool 6. Rotor 5, on one side thereof, is fitted with a brake coat 7. With a cog-wheel 8, secured on'shaft 2, a crown 9 interlocks and an annular disc 10 .made of soft iron, is attached onto it.

At one end of crank-shaft 11 a satellite carrier 12 is attached, on which three satellite cog-wheels 13 rotating freely are set up. The latter interlock, on the one hand, with a crown I4, and on the'other hand,.with a cog-wheel .15 secured'on shaft 2. When spool 6 is energised, shaft 2 is driven at the same speed as the flywheel 3, while the crank shaft 11 is set in a revolving Start-stop motion at a speed ratio of A or il/5 according to the choice of the satellites l3 and the crown 14. Brake.

Opposite to the soft iron disc 10 a spool 16 is set up whcih is firmly connected with housing 1 and is provided with a braking coat 17. When this spool 16 is energised, shaft 2 is braked.

Back run coupling To the flywheel 3 a cog-wheel 18 is attached, whereas shaft 2 carries a coupled crown 19 attached thereto. Between cog-wheel l8 and crown 19 three small satellite cog-wheels 20 are provided. A soft iron ring 21 is connected spring-wise with these satellites. Opposite to this ring is spool 22, with braking coat 23, connected with housing 1. When spool 22 is energised, ring 21 is tightened and holds the satellites 20. This causes crown 19 to be driven in the opposite direction in respect of flywheel 3. The central shaft 2 transmits this motion with a second slow-down (l2l5) to the crank-shaft 11.

Programming drum At the other'end of the crank-shaft 11 a ring 24, made of magnetical material, is attached which, on the one hand, carries asmall magnet 25 and, on the other hand, two annular metal discs 26 and 27 with hollowed part. These discs 26 and 27 are adjustable on thecircumference of ring 24 and are clinged in the desired position by a closing part 28, which carries a disc 29 divided into 360. A fixed arrow 30 enables to read the adjusted angle position. On the fixed outer ring 31 one or several adjustable spools 32 are set up. During the weaving cycle, the small magnet 25 passes every time along the spool (s) 32 at a pre-adjusted crank-shaft angle, thus inducing a tension in the same.

Opposite to discs 26 and 27 the

proximity switches

33 and 34 are positioned, consistingof oscillators which can be clamped in a given area due to the proximity of not hollowed parts of the discs 26 and 27. During every revolution of the crank-shaft these oscillators are thus damped periodically on a certain numberof degrees and set free again. Steering unit.

In the alternative execution now described, the steering unit is equipped with five pressure key switches 35 start, 36 stop," 37 backward position 38 slow forward position and 39 single shot. When the connection shown on FIG. 3 is put under tension, the

bistable sets

40, 41 and 42 take a preferential position, so that the outlet to the coupling and brake is at 0 level. This energises brake spoolv 16, while the coupling spools 6 and 22 remain currentless. The loom is then in braking position.

On pushing in switch 35, a 0 pulsion is added via diode 43 to bistable 41 A, which is tied up at outlet 0 of bistable 40 D availableon condition that bistable40 is not steering. This brings the 0 outlet of bistable 41 C on 1 and this position is supplied via diode 44 to the brake unit which is put out of action at once. The same signal l is delivered via zener diode 45 in order to steer the coupling spool on full current and to enable the loom to start quickly. Simultaneously, the 0 signal is delivered via diode 46 to bistable 47 B, whose outlet D is thus carried to 1. v

The outlet D of bistable 41, arrive at 0sets up an 0 level on switch 36 for performing the stoppage. If switch 36 is pusched in now, this "0 value comes at the inlet A of bistable 47 via diode 48 and sets the outlet D thereof on O."When magnet now generates a current pulse in magnet 32 transistor 49 becomes conductive and transmits the 0 level prevailing on switch 36 via diode to bistable 41 B, which tips back. Outlet C of bistable 41 is thus brought to nil, below the zener tension of zener diode 45, causing coupling spool 6 to become currentless. Simultaneouslydiode 44 blocks up and brake 16 comes into action. Slow back run In neutral position, with brake 16 in action, the back run can be started by pushing in switch 37, provided bistable 41 in C is at zero and the locking of oscillator 14 in free. This locking works as follows: when oscillator 34 is in action, the zener diode 51 is blocked up. Transistor 57 is not conducted then and delivers a signal 1 to switch 37. If the latter is pushed in, transistor 53 conducts and delivers signal 0 of bistable 41 C, via diode 54, to bistable 40 C. The latter tips and delivers a signal l to 40 D. The loom then runs through the satellits coupling 18-20 and at slowed-down rate until the crank-shaft reaches its rear position. At that moment, disc 27 will damp reaction spool 55 of oscillator 34, thus causing transistor 56 to become currentless. The zener diode 51 then conducts and brings transistor 57 in saturation, in consequence whereof a null pulse is sent via diode 58 to bistable 40 which then tips. Slow forward run The bistable multi 42 is connected with its outlet D, via diode 59 with the braking unit 16 and via zener diode 60 with a steering step 61. In the preferential position (rest position) of bistable 42, a 0 level is originated at its level D. In order to allow bistable 42 to tip, it is necessary to supply an 0 signal to B. This can be done by pushing in switch 38, provided that transistor 68 is under conduction, in other words that neither the bistable 40 C via diode 62, northe bistable 41 D via diode delivers a null level on the basis of transistor 68. Now, when oscillator 33 is damped by disc 26, a 1 level is supplied via zener diode 64 at the basis of transistor 65 which becomes conductive. A signal 0 is thus delivered via diode 66 to the basis of transistor 68, thus preventing the bistable 42 from being tipped by push button 38. The 0 level which is supplied simultaneously via diode 67 to bistable 42 in A locks the latter. In case oscillator 68 is free, transmitter 69 takes in current, thus causing transistor 65 to bethe cathodes of diodes 66 and 67. Now the bistable 42 in B can receive a 0" signal by means of switch 38, causing outlet D to come to 1. This level is, on the one hand, supplied via diode 59 to the braking unit 16, which falls out of action and steers, on the other hand, the steering step 61 via the zener diode 60, so that the coupling is carried out with limited current.

The loom runsslowly forward as long as oscillator 33 is in the free area or hollowed part of disc 26. At a given moment, oscillator 33 is damped by disc 26. This causes transistor 69 to become currentless and a level l to come via zener diode 64 at the basis of transistor 65, which will supply current andvdeliver a 0 level via diode 67 to bistable 42 A. Its outlet D comes to 0," causing brake 16 to come. into action and steering step 61 to become currentless. The same null level of transistor 65 and prevents the loom, upon new pushing in of switch 38, from continuing to run. It is possibe to tip bistable 42 only after having eliminated the damping of oscillator 33 by one of the other functions which get the loom moving.

I Single shot The outlet D of a monostable multi 70 is connected to bistable 47 A via a diode 71 and to bistable 41 A via a diode 72. By operating switch 39, 47 A can be brought to 0, provided that transistor 73 is conductive, which is possible only in case no 0 level is supplied at the basis of transistor 73, via the locking

diodes

74, and 76, which means that the loom is at a stop. In case multi 70 is taken out of its stable position by a 0" level at 70 A, a 0 level is originated during the unstable position at outlet 70 D which, on the one hand, delivers a starting impulse via diode 72 to bistable 41 A and, on the other hand, a stopping impulse via diode 71 to bistable 47 A. This prepares the stopping function, considering that outlet 47 D comes on 0 and that spool 32 causes a stop upon the first passage of the small magnet 25. In order to warrant the shot, it is necessary to keep up the starting impulse via diode 72 for a sufficiently long time until spool 32 is induced a first time without consequence, since the position of bistable 41 cannot be modified as long as 41 A remains at 0. After the first passage of the small magnet-25,

multi 70 tips back into its stable position and frees inlet 41 A, causing the-loom to stop after the first thrust. Warp controller i The switch 73 which can be controlled by a wellknown warp controller, has exactly the same action as switch 36.

Pick controller The pick controller will be preferably of the same type as described in another application handed in by the Applicant. It includes an oscillator 74with transistor 75'. As long as the latter does not conduct any current, a 1 tension comes via the zener diode 76 which keeps transistor 77 in conduction, thus bringing a level 0 on diode 78. In case a pick rupture is detected, the basis of transistor 77 receives a signal 0 and falls out of conduction; the leap l at diode 78 is delivered at the inlet 41 A, causing the loom to come to a stop. Due to the fact that in case of a start from the rear dead point of the drawer no pick thread comes under the needles, which would bring about a stoppage, the pick controller is put out of action during the first shot by means of a slowing-down element, for instance the monostable multivibrator 79, which in case of starting via diode 80, is tipped out of its stable position and which, during a lapse of time corresponding to the crank-shaft revolution, forms a 1" level at 79 C which is delivered at the basis of transistor 77.

Shuttle control- The execution of this device must be of an electronic nature and may, in addition to the design described hereunder, which should be considered as an example, eventually be of the same nature, just as any of the existing and well-known plants. Let us quote as an example two

spools

81 and 82 are inserted in drawer 83 symmetrically to the middle of the run, taking into account the position of a magnet 84 provided in the shuttle 85 (FIG. 5). Two .spools86 and 87 are provided on disc 31, so that the magnet 25 passes here, viz. at i, (rear position of drawer) and at t 230.

During the forward run the emitter side of transistor 88 is at 0." When spool 86 is induced, transistor 88 becomes conductive during the impulse and supplies the 0 level via diode 89 at the inlet A of bistable 90.

This originates a 0" outlet at 90 D. If this position is not modified, transistor 91 will become conductiveat the moment of the impulse in spool 87 and will deliver the 0 position at inlet B of bistable 41. This originates an 0 at 41 C which cuts out the coupling via steering step 92 and switches in the braking unit via diode 44. However, if, during the run in spool 81 (left' right run of right left), a tension is timely induced in the passage direction by the small magnet 84, transistor 93 (94) becomes conductive and delivers a 0 via diode 95 at inlet B of bistable 90. The latter then tips back and cancels the position originated by spool 86. Outlet 90 D gets a l value and transistor 91 cannot be made conductive when the small magnet passes in front of spool 87.

Safety in case of current interruption With the emitter of transistor 49 a normally closed contact 96 is connected from a 24 V relay which is directly linked up with a 18 V secondary winding of the feeding transformer. in normal operation, this contact is therefore open. As soon as the current falls, 96 closes, causing transistor 49 to be brought to 0 level. The whole electronic connection has sufficient reserve through unloading of condensers (see further on: capacity unit) to allow the normal stop function to work at the right moment and to make sure in this way that even in case of current interruption the shuttle 84 is in one of the

boxes

97, 98 at the moment when the loom comes to a stop.

Capacity unit (FIG. 4)

Transistor 98 is locked by a negative tension which arrives at its basis via resistance 100. A current can then flow through

resistances

101 and 102, basis and emitter of transistor 103, resistance 104 and condenser 105. The collector current originated accelerates the loading of condenser 105 up to the potential, while the UJ. transistor 106 becomes conductive. The current impulse originated in spool 107 delivers a positive im pulse, to the secondary side on the gate of

thyristors

108 and 109, which, when a positive tension comes on their anode, alternatively feed braking spool 16 as steered rectifiers.

When a 1 level is delivered to one of the

diodes

110, 44 and 59 (emanating

form the'bistables

40, 41 and 42 respectively) and the basis of transistor 99, the latter becomes conductive and is steered in saturation. in consequence thereof the collector potential drops approximatively to the emitter potential: transistor 103 gets no more basic current and resistance 104 and condensor 105 becomev currentless. Thus .the positive pulses disappear on the gates of

thyristors

108 and 109 and the braking spool 16 is energised no more. In case the 1 level comes from 41 C, it comes through the zener diode 45 and the transistor 111 which steers transistor 112 in saturation, causing the front coupling spool 6 to drawfull current and to transmit the maximum couple (forward run). In case the I. level comes from 42 D (forward position), transistor 113, via zener diode 60, becomes conductive while however the collector current is restricted. Transistor 112 then allows a lower current to pass to spool 6.

This current is regulated so that a slipping coupling transmission is originated and consequently a slowed-- down motion of the drawer to the forward position. If finally level l of 40 C (backward position) comes via zener diode 114, transmitter 115 becomes conductive and brings transistor 116 in saturation, which delivers maximal current through the back flow spool 22. The latter locks the satellites 20 of the planetary backward run drive and originates a slowed down backward run of the drawer.

As soon as the feeding tension is supplied, condenser 117 is loaded via resistance 118 and diode 119. Condenser 117 forms a power reserve which will be used upon breaking of the loom. As soon as one of the

sets

40, 41, 42 tips, this originates a 0 level which causes

transistors

113, 111 and to become currentless and a coupling to be cancelled. Simultaneously the basic current of transistor 99 is interrupted via

diodes

110, 44 or 59, causing the collector current to be cancelled by leaps and the basic current of transistor 103 can be originated again via

resistances

101, 102, 104 and condenser 105.

The sudden potential leap via resistance 101 is transmitted to condenser 120, which delivers a positive 7 pulse on the emitter of the U.J. transistor 121. In consequence thereof, a current leap is originated via transistor 121 in spool 122, which originates a positive pulse in the secondary. The latter opens the gate of thyristor 123, causing condenser 117 to unload in braking spool 16. Meanwhile the maintenance current is supplied by

thyristors

108 and 109, as described hereabove.

This unloading of the condenser loaded at high tension brings about a very quick braking action through shortening of the area in which the subsiding coupling spool current and the rising braking spool current counteract mutually.

The advantages which the device described hereabove affords to a more or less large extent with respect to the conventional drive are numerous and may be summarized as follows:

higher stability in drawer, owing to less deviation of the common rotary motion.

less slowing down caused by the thrust and consequently less vibration in the drawer during the shuttle stroke.

less current variations through drawer motion and consequently less heating and smaller motor.

planetary transmission and consequently less volume and less axial pressure.

start from any crank-shaft position same thrust on first shot as in subsequent run.

quick braking, owing to stricter over-tension followed by low maintenance current.

possibility of adjusting different lbraking angles.

direct connection of electro-mechanical pick controller with stop at 320.

direct connection of electric or electro-mechanical warp controller. v I backward run at slow speed outside thrust area with adjustable locking. forward run at slow speed outside thurst area with adjustable position for pulling through.

single shot by push button from any stop position.

no loading of shuttle through thrust-clack.

less noise.

control on'shuttle speed with a very small risk area.

possibility for higher speed or better output.

locking against faulty service.

safety in case of current failure (no thread punch) safety on motor loading.

What 1 claim is:

1. In a weaving loom'having a motor and a crankshaft connected to said motor, a driving device comprising a first planetary drive on said crank-shaft, a flywheel driven by said motor, an intermediate shaft, an electromagnetic coupling between said flywheel and said intermediate shaft, said electromagnetic coupling consisting of a fixed ring-shaped coupling spool positioned about said intermediate shaft, a rotor operatively connected with said flywheel, a ring-shaped soft iron disc located close to a part of said motor and provided with a braking surface, a crown linked to said disc and a fixed cog wheel carried by said intermediate shaft and interlocked with said crown and a stationary braking spool on the other side of said disc, wherein the ratio between the rotary speed of said crank-shaft and the rotary speed of said flywheel is betwen 4 to l and 5 to l.

2. Driving device according to claim 1 wherein said device being further equipped with a second planetary drive between the flywheel and the said intermediate shaft, whose satellite cog-wheels can be locked against the rotation around the latter by means of a back-run spool, thus enabling the loom crank-shaft to be driven in the opposite direction without altering the rotary direction of the flywheel.

3. Driving device according to claim 1, wherein the crank-shaft is equipped with a programming drum, consisting essentially of a ring firmly linked up with the crank-shaft, on which at least on hollowed ring-shaped disc is adjustably positioned and which furthermore carries a small magnet; of a fixed ring carrying at least one spool which is periodically influenced by the small magnet, and of at least one remote switch opposite to the said ring-shaped disc.

4. A driving device accordng to claim 1, comprising an electronic steering unit steering said spools.

5. A driving device according to claim 4, comprising a capacity unit controlled by said steering unit and energizing said spools.

6. Driving unit according-to claim 1, wherein said braking spool is energized when the speed of the shuttle does not tally with a predetermined limit value.

7. Driving device according to claim 6 wherein the said energising is dependent on the time elapsing between the moment when a signal is originated in a spool mounted on the drawer by a magnet positioned in the shuttle and a signal originated in a spool of the abovementioned programming drum.

Patent No. 3,805,849 Dated April 23, 1974 lnventofls) Bernard Charles-Louis Steverlynck It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

The assignee should read Weefautomaten Picanol, naamloze venootschap (Metiers automatiques Picanol societe anonyme) Sign! and Scaled this sixteenth D 3) 0f December 19 75 [SEAL] A nest:

RUTH C.MASON c. MARSHALL DANN Arresting ()jficer (ummissirmer nj'Patents and Trademarks UNITED STATES PATENT OFFICll' CERTIFICATE OF CORRECTION Patent No. 5 5, 9 Dated Y April 25, 1971+ lnventofls) Bernard Charles-Louis Steverlynck It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

On the Title page, In item the assignee should read as follows:

- Weefautomatent picanol, naamloze' vennootschap (Metiers automatiques Picanol, sooiete anonyome) Leper Belgiwn Signed and sealed this 3rd day of December; 1974.

(SEAL) Attest: McCOY M. GIBSON JR. c. MARSHALLL'DANN Attesting Officer 1 Commissioner of Patents F ORM PO- T I UseOMM-DC 6037 6-P69 .5'. GOVERNMENT FRINTlNG OFFICE: a 9 o

Claims

1. In a weaving loom having a motor and a crank-shaft connected to said motor, a driving device comprising a first planetary drive on said crank-shaft, a flywheel driven by said motor, an intermediate shaft, an electromagnetic coupling between said flywheel and said intermediate shaft, said electromagnetic coupling consisting of a fixed ring-shaped coupling spool positioned about said intermediate shaft, a rotor operatively connected with said flywheel, a ring-shaped soft iron disc located close to a part of said motor and provided with a braking surface, a crown linked to said disc and a fixed cog wheel carried by said intermediate shaft and interlocked with said crown and a stationary braking spool on the other side of said disc, wherein the ratio between the rotary speed of said crankshaft and the rotary speed of said flywheel is betwen 4 to 1 and 5 to 1.

6. Driving unit according to claim 1, wherein said braking spool is energIzed when the speed of the shuttle does not tally with a predetermined limit value.

7. Driving device according to claim 6 wherein the said energising is dependent on the time elapsing between the moment when a signal is originated in a spool mounted on the drawer by a magnet positioned in the shuttle and a signal originated in a spool of the above-mentioned programming drum.