US2750965A - Looms for weaving - Google Patents

Description

June 19, 1956 l. s. PORTER 2,75,65

LOOMS FOR WEAVING Filed Aug. 25, 1952 4 Sheets-Sheet 1 F/GE INVENTOR ATTORNEYS June 19, 1956 l. S. PORTER LOOMS FOR WEAVING 4 Sheets-Sheet 2 Filed Aug. 25, 1952 in .c

I| I l NVENTOR lam WWW ymkh ATTORNEYS June 19, 1956 x. s. PORTER 2,759,965

LOOMS FOR WEAVING Filed Aug. 25, 1952 4 Sheet-Sheet 5 INVENTOR ATTORNEYS June 19, 1956 SQPORTEIR 2,750,965

LOOMS FOR WEAVING Filed Aug. 25, 1952 4 Sheets-Sheet 4 6 r 3 9 a) 2 LL A FNVENTOR m ATTORNEYS LOOMS FOR WEAVING Ian Stephen Porter, Barnsley, England Application August 25, 1952, Serial No. 306,248

2 Claims. (Cl. 13942) This invention relates to an improved motion for the insertion and withdrawal of the pile wires used in looms for weaving plushes, moquettes, carpets and similar pile fabrics.

In a normal loom for such purpose a wire is inserted at one pick and another wire withdrawn on the second pick and the cycle is then repeated and the motion forming the invention is suitable for such a cycle. In certain weaves however, a cycle of three, four or more picks may be required and the motion can be made applicable to such a cycle by the introduction of suitable gearing.

In looms of the kind to which the invention relates it is desirable to insert and withdraw the wires at varying speeds depending on the speed of the loom and the fabric being woven and the motion forming the invention allows of such varying speeds being obtained.

According to the present invention one end of an arm, hereinafter referred to as the epicyclic driving ram, is secured on a driving shaft e. g. the tappet shaft of the loom and the other end of the arm carries a short shaft or pin rotatably mounted therein; the short shaft or pin carries a sprocket wheel which is in alignment with a stationary sprocket wheel co-axial with the driving shaft, the two Wheels being connected by a chain, a second arm, hereinafter referred to as the driven arm, is also secured at one end on the short shaft or pin, the epicyclic driving arm and the driven arm being of the same length, and the other end of the driven arm carries two pulleys forming the means for imparting the desired movement to the pile wire hopper or slide, the ratio of the gearing between the two sprocket wheels being such that as the epicyclic driving arm rotates, the free end of the driven arm and consequently the pulleys thereon are constrained to move with a straight line movement.

The invention is illustrated in and will be described with reference to the accompanying drawings, in which:

Fig. l is a perspective view of the side of a loom showing the invention applied thereto,

Fig. 2 is a side elevation,

Fig. 3 is a plan partly in section on line 3-3 of Fig. 2,

Fig. 4 is a diagrammatic view of the cord driving the pile wire hop er or slide,

Fig. 5 is a sectional plan of the epicyclic drive, and

Fig. 6 is a section on line 6-6 of Fig. 2.

The apicyclic driving arm A is secured on the tappet shaft or other rotating shaft of the loom, hereinafter called the driving shaft A The arm A carries at its free end a short shaft B rotatably mounted in bearings. The short shaft B extends beyond both sides of the epicyclic driving arm A and at one end carries a sprocket wheel C which is in alignment with a fixed sprocket wheel C coaxial with the driving shaft. The two sprocket wheels C and C are connected by a chain D which is tensioned by a jockey wheel d the axle d of which is mounted in a slot a in a lateral extension of the epicyclic driving arm A. The other end of the short shaft B carries the driven arm E in the free end of which is mounted a short shaft F carrying two pulleys F F nited States Patent Thus, as the epicyclic driving arm A rotates a rotary movement is imparted to the sprocket wheel C carried by the arm relative to the latter owing to the wheel being connected to the stationary sprocket wheel C by the chain D and the gear ratio of the two sprocket wheels C and C is such that as the first wheel rotates about the axis of the driving shaft its rotation about its own axis will be such as to impart a straight line movement to the free end of the arm E and consequently to the pulleys F and F to transmit the requisite motion to the wire hopper or slide G which inserts and withdraws the wires from the fabric being woven.

To transmit this motion a cord or cable H is fixed at one end to a stationary point it on the frame of the loom, passes around the pulley F carried by the driven arm E and over two fixed guide pulleys h and W, and is secured at the other end to one end of the wire hopper or slide G. A second cord or cable H is fixed at one end to a stationary point h passes around the second pulley F carried by the driven arm E and over three further fixed guide pulleys h h h and is secured at the other end to the opposite end of the hopper or slide G to that at which the cord or cable H is attached. Instead of employing two cords or cables H and H a single cord affixed to the slide G may be employed.

The stationary points h and h to which the cords or cables H and H are afiixed are so located that when the pulleys F 1 and F carried by the driven arm E are moved linearly in one direction by the epicyclic driving arm A, the hopper or slide G is moved in one direction and when the pulleys F and F are moved in the opposite direction the hopper or slide is also moved in the opposite direction.

The equivalent of a dwell at each end of the movement of the pile wire hopper or slide G may be obtained by increasing the distance moved by the hopper or slide at each end beyond the normal distance required for inserting and withdrawing the wire.

Moreover should it be desired to insert and withdraw the pile wire at varying speeds and also obtain a dwell at each end of the movement the epicyclic driving arm instead of being secured to the driving shaft may be loosely mounted thereon and driven therefrom at varying speeds by a cam or by eccentric or elliptical driving wheels.

One mechanism for giving a variable rotary speed to the epicyclic driving arm about the shaft consists of an arm keyed on to the driving shaft and carrying a two armed lever pivotally mounted thereon. One end of this lever carries a pin and the other end carries an antifriction roller. An arm is secured to the sleeve loose on the driving shaft to which the epicyclic driving arm is afiixed and the arm secured to the sleeve is formed with a radial slot in which the pin of the two armed lever is located. A fixed cam surrounds the driving shaft in the path of the anti-friction roller whereby as the arm keyed to the driving shaft rotates with the shaft the two armed lever is oscillated by the cam and consequently the pin moves in the slot of the arm secured to the sleeve so that the latter whilst making one revolution for each revolution of the shaft moves at varying angular speeds during each revolution and since the arm is secure to the sleeve to which the epicyclic driving arm is affixed, the latter arm will also rotate at varying angular speeds although making one revolution for each revolution of the shaft. Should it be desired to alter the varying angular speeds of the epicyclic driving arm it is only necessary to replace the fixed cam by another. cam of a different contour.

What I claim is:

1. Means for the insertion and withdrawal of pile wires in looms having a frame and a pile wire carrying slide mounted thereon for Weaving pile fabrics, comprising the combination with a constantly rotating shaft of the loom of an epicyclic driving arm mounted thereon, a short shaft rotatably mounted at one end of the epicyclic driving arm, a sprocket Wheel carried on the short shaft, a stationary sprocket wheel carried by the frame in alignment with the first sprocket wheel and coaxial with the axis of rotation of the epicyclic driving arm, a chain connecting the two sprocket wheels, a driven arm secured on the short shaft, two pulleys mounted on the free end of the driven arm, a cord passing around one of said pulleys and being secured at one end to a stationary part of the loom and at the other end to the said slide for imparting movement thereto in one direction, a series of fixed guide pulleys around which said cord passes, a second cord passing around the other of said two pulleys and secured at one end to a stationary part of the loom and at the other end to said slide for imparting movement to said slide in the other direction, and a second series of fixed guide pulleys around which the second cord passes, the ratio of the gearing between the two sprocket wheels being such that as the epicyclic arm rotates, the free end of the driven arm and consequently the pulleys thereon are constrained to move with a straight line movement.

2. In a loom having a frame, a pile wire carrying member slidably mounted on said frame and a continuously driven power shaft, means for smoothly reciprocating said slide at high speed comprising an epicyclic arm fixed on said shaft, a driven arm pivoted at one end on said epicyclic arm about an axis parallel to said shaft and having a pulley assembly rotatably mounted on its other free end, a stationary sprocket mounted on the frame coaxial with the power shaft a second rotatable sprocket mounted on the pivot axis of said driven arm to move with said driven arm about that pivot axis, a chain interconnecting said sprockets, and a system of cords and directional pulleys connected between the pulley assembly on said driven arm and said member, the sprockets being of such relative diameter and drive ratio that rotation of said power shaft produces straight line reciprocation of the pulley assembly on said other end of said driven arm in a plane perpendicular to the axis of said power shaft and said straight line motion is directly transmitted from said pulley assembly through said system to correspondingly reciprocate said member.

References Cited in the file of this patent UNITED STATES PATENTS 776,375 Beattie et a1 Nov, 29, 1904 1,771,662 Stone July 29, 1930 FOREIGN PATENTS 430,688 Great Britain June 24, 1935 539,700 Great Britain Sept. 22, 1941 608,356 Germany Jan. 22, 1935

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