US2594209A - Electric stop motion for looms - Google Patents

Description

3 Sheets-Sheet 1 Ap 1952 I. s. PORTER ELECTRIC STOP MOTION FOR LOOMS Filed June 26, 1950 Attorneys 3 Sheets-Sheet 2 I. S. PORTER ELECTRIC STOP MOTION FOR LOOMS April 22, 1952 Filed June 26, 1950 NOE u J Z E 0 A itorneys April 1952 1. s. PORTER ELECTRIC STOP MOTION FOR LOOMS 3 Sheets-Sheet 3 Filed June 26, 1950 Inventor 3M m$m L Attorneys Patented Apr. 22, 1952 oFFIcE ELECTRIC STOP MOTION FOR LOOMS Ian Stephen Porter, Barnsley, England Application June 26, 1950, Serial No. 170,453 In Great Britain July 1, 1949 3 Claims.

This invention relates to electric stop motions of looms for weaving and particularly to improvements in the stop motions of looms driven by an independent electric motor provided with an electro-magnetic brake.

The object of the invention is to ensure that the loom will stop at a predetermined point in the cycle of the weaving operation, e. g. when the shuttle is in the shuttle box at whatever point in the cycle the breakage or failure of warp or weft may occur causing the stop motion to operate.

According to the invention the circuit causing the opening of the circuit to the electric motor and the application of the brake is provided with two breaks, the first of which is closed by a relay when the stop motion or any of the stop motions, in case of a loom having more than one stop motion, comes into operation and the second of which is closed by a cam which istimed to come into operation at any desired point in the revolution of the crank cam shaft of the loom.

Thus when the relay is operated by the operation of a stop motion the first break will be closed but the second break will not be closed by the cam until the crank shaft has reached the desired point in the weaving cycle.

Although the invention is not limited thereto it is particularly applicable to either a single or double warp pile carpet 100m having a warp stop motion, a heald frame stop motion and a knife band stop motion, and the accompanying drawings, in relation to which the .invention will be described, show this application of the invention.

In these drawings: V

Fig. l is an electrical circuit diagram showing the control of the driving motor and brake from the three stop motions;

Fig. 2 is a front elevation of a construction of a heald frame suitable for controlling the heald frame stop motion;

Fig. 3 is an end elevation thereof;

Fig. 4 is a section on line 4-4 of Fig. 2;

Fig. 5 is an elevation of a form of knife band stop motion, and

Fig. 6 is a section on line 5 Fig.5.

The circuit shown in the left hand side of Fig. 1 is a normal circuit to a reversing motor having an electromagnetic brake which comes into action to stop the motor immediately the circuit to the motor is broken. In this circuit A, B, and C, represent the three phase leads to the motor and B and C the leads to the electro-magnetic brake. D and D represent the forward contactor and the reverse contactor respectively and d and d the switches controlling the forward and reverse movements of the motor, these switches being operated by a starting handle D The circuit from the contactors D and D to the motor contains a thermal overload device D which on coming into operation opens a trip switch (1. Emergency push button operated switches E are also arranged at suitable positions in the circuit.

Accordin to the invention the circuit contains a switch j which is normally closed but is opened by an electro-magnet F when a relay circuit to the latter from a transformer T is energised, the energising of this relay circuit being controlled by one of the stop motion devices which it is desired should stop the loom.

As previously stated three stop motion devices are shown in Fig. l, i. e. a warp stop motion device W, a heald frame stop motion device 9 and a knif band stop motion device 70 I The stop motion devices r g and k are arranged in parallel and are connected through normally closed contacts r 9 and k to relays r, g and It respectively so that when one of the devices 1 g or k operates the corresponding relay 1', g or k which closes the contacts r 9 or k and consequently the relay circuit to the electro-magnet F is closed provided; the switch :77. in the circuit is closed.

The switch it is closed by a cam H operated from the crank shaft of the loom so that the relay circuit to the electro-magnet F is only closed when the cam shaft has reached the desired point in the weaving cycle when it is desired that the loom should be stopped. This point is usual- 1y when the shuttle is in the. shuttle box but the loom can be stopped at any other point in the weaving cycle by arranging the cam H to close the switch h at such point.

The contacts 1- g or k can be opened manual- 1y if it is desired to put out of operation the corresponding stop motion device 1 g or W.

A tell tale lamp R, G, or K is arranged in paral lel with the circuit from the contacts r g and k to the electro-magnet F and these lamps may be arranged on a panel P carrying the relays 1-, y and k and contacts 1 g and k or they may be arranged on any desired position on the loom.

In order that the heald frame stop motion device can only operate at a predetermined time in the weaving cycle e.-g. when a heald is in or approaching its bottom position, a switch y controlled by a cam H is arranged between the-device y and the relay g so that the device 9 will not close the circuit to the relay g until the cam H has closed the switch g The cam H is operated from the crank shaft of the loom.

- tact bar I0.

It is to be understood that any other stop motion devices e. g. a weft stop motion may introduced into the relay circuit in parallel with the stop motion devices 1', g and k and that such additional device or devices would control the relay circuit in a similar manner to the devices 1, g and 7c.

The warp stop motion controlling the device r can be of the conventional electrode bar type which is well known.

A knife stop motion for controlling the device It is illustrated in Figs. and 6. In this arrangement the knife severing the pile is traversed backwards and forwards by a cord, catgut or the like hereinafter referred to as the band I and the object of the arrangement is to stop the loom not only if the band breaks but if it becomes too slack. To achieve this object the support 2 on which is mounted one of the pulleys 3 over which the band I passes is carried a on a rod 4 slidably mounted in the bracket 5.

, member is formed by a contact 9 carried by but insulated from the bracket 5.

The contact members 8 and 9 will be closed should the band I break or should it become sufliciently slack that its tension on the pulley 3 is insufficient to prevent the spring 5 from closing the contacts 8 and 9.

A heald frame stop motion suitable for controlling the stop motion device 9 of the relay is shown in Figs. 2, 3 and 4.

In this arrangement two electrode or contact bars III are mounted between the side members II of the heald frame near the top thereof and are insulated therefrom; Each bar I 6 is connected to an electrical contact I2 by a spring loaded contact plunger I3, each contact plunger being slidably mounted in a block I4 of compressed fibre Or other insulating material secured to one of the side members I I of the frame. The contact I2 is connected by a strip I5 of copper or other material of good conductivity to a terminal I6 and this terminal is connected to an element I8 in the relay circuit by a light spring II, the element I8 being mounted on an insulator l9 secured to the frame of the loom.

The heald wires which may be fiat steel type or of wire type with flattened ends, are slotted at 2| near their upper ends and the electrode or contact bars I!) pass through the slots 2|.

The electrical circuit to the element I8 is only complete as the heald frame is approaching its bottom position, the circuit being completed by a make, and break device such as the switch g and cam H shown in Fig. 1 timed with the movement of the heald frame. Normally when the heald frame approaches the bottom position the tension of the yarn passing through the eye ZIW- of each heald wire 20 keeps the top of the slot 2I in the wire clear of the electrode or con- If however a yarn is broken the corresponding wire 2!] falls and the top of the 4 slot makes contact with the electrode or contact bar Ill thereby completing the relay circuit as the frame approaches its bottom position.

I claim:

1. In an electric stop motion for a warp pile carpet loom driven by an independent electric motor and having an electromagnetic brake, the combination of a warp stop motion, a heald frame stop motion and a knife band stop motion,-a circuit for the motor and the brake, a switch in the motor circuit which is normally closed, a solenoid operative when energized to open said switch. a second circuit containing said solenoid and operative when the second circuit is completed to energize the solenoid and open said switch in the motor circuit, a break in the second circuit which is normally open, relays responsive to the operation of the respective stop motions for closing the second circuit when a fault occurs, and a second break in the second circuit which is opened and closed intermittently, the closing of said second break being timed to take plact at a desired point in the weaving cycle.

2. 'An electric stop motion for a loom as defined in claim 1, including a heald'frame comprising side members and heald wires having slots near their upper ends. and eyes for the passage of yarn therethrough, and wherein said heald frame stop motion consists of two contact bars carried by the side members of the heald frame, each bar having a spring-loaded plunger and a light spring connecting it to said second circuit, said contact bars passing through the slots of the heald wires, and. each heald wire being held out of contact with the respective contact bar by the yarn passing through the eye of the Wire but permitting the wire to fall consequent upon breakage of the yarn to cause the heald wire to 'make contact with the respective contact bar to close the second circuit, and including means timed to keep the second circuit open except when the heald frame isapproaching its bottom position 7 3.. An electric stop motion for a. loomas defined in claim 1, wherein said knife band stop motion comprises a knife band, a pulley around which the knife band passes, a support carrying said pulley and a pair of cooperative contacts in said second circuit with the respective relay, and a spring which loads said support to a predetermined tension and which is operative, when the tension of the band on the pulley falls below the tension applied to the support, to move said support to close said contacts and cause operation of said relay.

IAN STEPHEN PORTER.

REFERENCES. CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,080,091 Wintermayr Dec. 2, 1913 1,812,206 Hindle et al'. June 30, 1931 2,429,006 Whitin Oct. 14, 1947 2,439,031 Wilson Apr. 6, 1948 2,475,505 Kronofi et a1 July 5, 1949 2,499,887 Sullivan eta1 Mar. '7, 1950

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