US2792850A - Automatic temple knife rest - Google Patents

Description

May 21, 1957 E. P. cAsHloN EI'AL 2,792,850

AUTOMATIC TEMPLE KNIFE REST Filed Sept. 22, 1954 INVENTORS. EMERSON P. CA5H\ON By DEWEY FgwuLz ATTORNEY United States Patent AUTOMATIC TEMPLE KNIFE REST Emerson P. Cushion and Dewey Friddle, Greenville, S. C. Application September 22, 1954, Serial No. 457,581

7 Claims. (Cl. 139-266) This invention relates to looms and more particularly to an attachment for an automatic temple knife which will normally retire or hold the temple knife in inoperative position but which will release the temple knife responsive to movement of the automatic change mechanism of the loom to permit cutting operations necessary to sever the ends of yarn resulting during a bobbin changing operation.

According to present practice the temple knife of a loom operates continuously by virtue of the lay striking the temple knife arm actuating same on each beat-up of the loom. This causes constant wear to the moving parts and often causes broken picks by reason of the knife catching the filling during normal operation of the loom. This catching of the filling resulting in broken picks occurs most often in the case of synthetic fibers since this yarn tends to bunch up due to the high degree of twist therein. This has resulted in the practice of placing moleskin over the face of the temple knife support to prevent the yarn from coming close enough to be engaged by the temple knife.

Most modern looms employ what is known in the trade as a Stafford thread cutter which is actuated by and may be considered a part of the automatic change mechanism. It is the function of the Stafford thread cutter to grasp the yarn coming from the empty bobbin and to cut the same from the bobbin allowing the empty bobbin to drop into a can provided for that purpose. In carrying out this operation the Stafford thread cutter employs two pairs of mechanical fingers for grasping the yarn. This grasping of the yarn by the Stafford thread cutter results in undue tension being placed on the filling causing, in the case of synthetic fabric, what are known as shiners. These shiners are a major cause of seconds in the weaving of synthetic fabrics.

Accordingly, it is an object of this invention to provide an attachment for an automatic temple knife which will normally cause the knife to be retired but which will place the knife in operative position during a bobbin changing operation which will be automatically responsive to actuation of the automatic change mechanism.

Another object of this invention is to provide an attachment for an automatic temple knife which can be adjusted to obviate the possibilities of broken filling resulting from improper operation of the temple knife.

It is another object of this invetion to provide a simple attachment for an automatic temple knife, the installation of which will not require any change in the existing structure of the loom but which will prevent broken picks and eliminate shiners."

Still another object of this invention is to provide an attachment for a loom which will permit the cutting of the end from an empty bobbin during a bobbin changing operation prior to the end being grasped by the Stafford thread cutter preventing jerked in filling" or jerk backs caused by the pulling of the end back into the cloth. so

Patented May 21, 1957 that the Stafford thread cutter may be eliminated if desired.

Yet another object of this invention is to provide an attachment for an automatic temple knife which normally holds the knife in inoperative position except during the bobbin changing operation when two cutting operations are permitted severing the ends from the empty bobbin and new bobbin and which is out of the way so as not to interfere with the normal operation of the loom.

We accomplish these and other objects of our invention by providing an attachment for an automatic temple knife for a loom having automatic bobbin change mechanism comprising an arm adapted to be fixedly connected to the transfer rod, a shaft pivotally connected adiacent one end to the free end of the arm, a bracket carried by the temple knife housing in which the medial portion of the shaft is slidably positioned, a bifurcated portion carried by the free end of the shaft, a roller element rotatably mounted in said bifurcated portion, an elongated resilient member mounted on one end of the temple knife housing being supported adjacent the other end by the roller element, a cam portion integral with said resilient element adjacent the roller element, a downwardly projecting latch arm integral with said cam portion adapted to hold said temple knife in inoperative position and an abutment above and adjacent the medial portion of said resilient element whereby, upon actuation of the automatic bobbin change mechanism the latch arm will free the temple knife allowing it to be placed in operative position.

In addition to the above we have provided means for adjusting the position of the pivotal connection between the arm and the shaft, means for vertically adjusting the position of the bracket, means for adjusting the position of the connection between the resilient element and the temple knife housing and means for adjusting the pressure exerted by the abutment against the resilient element so that adjustments may be easily made to place the temple knife in a position to most effectively cut the yarn.

While some of the objects have been stated above others will become apparent to those skilled in the art relating to weaving when the specification is read in connection with the accompanying drawing in which:

Fig. l is a perspective view showing the attachment operatvely positioned in connection with a temple knife,

Fig. 2 is a view of the front of the temple knife looking from the right hand side of Fig. 1 and,

Fig. 3 is a side elevation showing the attachment holding the temple knife in inoperative position during the normal operation of the loom.

Referring more particularly to the drawing the numeral l0 broadly designates the temple of a model XK Draper loom. As will appear to those skilled in the art the attachment to be described below may be readily modified to be employed with any loom having automatic bobbin change mechanism. The numeral 12 designates the transfer rod which operates the automatic change mechanism, of which the Stafford thread cutter (not shown) may be considered as forming a part, responsive to the feeler mechanism which operates on most automatic looms to actuate the automatic change mechanism when an almost empty bobbin should be replaced with a full bobbin. A bracket 14 is slidably mounted on a trackway 16 positioned on the upper surface of the temple 10 and supports the automatic temple knife housing broadly designated at 20.

The housing 20 is provided with an extension 22 projecting rearwardly to which a temple knife support 24 is fixedly mounted. The extension 22 of the temple knife housing 20 has a downwardly projecting buffer portion 28 which limits the forward movement of the temple knife actuating arm 30. It will be noted that the temple knife 32 is integral with the actuating arm 30 and fits within a slot 34 in the temple knife support 24. A spring 36 which is secured on one end as at 37 to the temple knife support and on the other to a pin 38 fixedly mounted on the actuating arm 30, normally urges the actuating arm 30 rearwardly and hence the temple knife 32 upwardly in the drawing.

Fig. 1 shows a piece of cloth designated at C passing over the temple l and over the shipper rod 49 which acts as a guide therefor. Figs. 1 and 2 show a projecting fila ment or end of yarn designated at P which is attached to the empty bobbin (not shown) about to be cut by the temple knife 32 shown in operative position. Another filament designated at F (shown in broken lines in Fig. l) is the filament from the new bobbin, one end of which is attached to the battery head (not shown).

Fig. 3 shows the lay of the loom broadly designated at 46 and the parts of the temple knife arm 30 (shown in dotted lines) so positioned as to be moved forwardly by the lay 46 on the next heat-up causing a downward move ment of the knife 32 to cut the end F a short time prior to its being grasped by the Stafford thread cutter. The solid lines show the temple knife 32 in retired position. Thus far the parts described and their operation are standard with most modern looms and there follows a description of the attachment and of its operation therewith.

An off-set arm 48 is shown in the drawing removably secured to the transfer rod 12. A portion 50 is removable and adapted to be secured to the arm 48 by the screws 52 for the purpose of securing the off-set arm 50 to the transfer rod 12 at a desired point depending upon the width of cloth being woven. A set screw 54 is provided for preventing the off-set rod from turning on the transfer rod. Some looms have bearings (not shown) for the transfer rod 12 so positioned that it would be impossible to secure the arm 48 at the end of the transfer rod 12 so as to weave a maximum width of cloth were it not for the off-set feature. At the upper or free end of he arm 48 a shaft 56 is pivotally secured adjacent its free end on a pin 60 projecting from a stub member 62 which is adjustably positioned on the shaft 56 as by set screws 62a. The shaft 56 is slidably mounted in the medial portion thereof on a bracket 64. The bracket 64 is adjustably secured to the temple knife housing 20 as by bolts 68 which pass through slots 66 which permit adjustment thereof.

The free end of the shaft 56 has an upwardly projecting bifurcated portion 70 integral therewith. A pin 72 is fixedly mounted at each end thereof within the bifurcated portion 70 and a roller 74 rotatably carried thereon. it should be noted at this point that a plate '76 may be attached to the housing 20 by any suitable means such as screws 78 for mounting the bracket 64 as well as the other parts of the attachment thereon although the parts may be attached directly to the temple knife housing 20. An elongated resilient element 80 is secured adjacent the forward end of the temple knife housing 20 as by the nut 82 which is threaded on a bolt 820 secured to the plate 76. A slot 84 through which the bolt 82a projects is provided for adjusting the position of the resilient member 80 by loosening the nut 82 prior to effecting such adjustment.

An eccentrically mounted abutment 90 is adjustably mounted on the plate 76 on the screw 90a. It will be noted that the tension on the resilient member 80 may be adjusted by loosening the screw 99a and turning the abutment 90 thereon to a position which will afford a desired amount of pressure exerted thereby against the resilient member 80. If desired the abutment 90 may be in the form of a vertically mounted screw (not shown) which may be threaded in a projection carried by the plate 76. This projection could be integral and stamped out with the rest of the plate.

A looped portion 88 integral with the resilient element 80 provides a cam surface which is normally adapted to till fit over the roller as shown in Fig. 3 but when the transfer rod 12 is turned in a counterclockwise direction to effect a bobbin changing operation, the roller operates to raise the adjacent end of the member on which the latch arm 92 depends forwardly and downwardly. it will be noted that a cut out or latch portion 92b is provided for engaging the pin 38 attached to the temple knife actuac ing arm 30 for holding the same in retired position. The terminal portion of the latch arm 92 is provided with a curved surface 92c on which the pin 38 is adapted to ride prior to being engaged by the cut out portion 92b.

In operation, therefore, upon actuating of the automatic change mechanism the transfer rod 12 will turn counterclockwise raising the latch 92 to place the temple knife 32 in operative position. On the first beat-up following this operation the end P from the old bobbin is cut (at the same time the empty bobbin is replaced with a full bobbin} and the transfer rod 12 returns in a clockwise direction to its normal position. At this point the latch arm 92 has been lowered preparatory to engaging the pin 38 to retire the temple knife 32. On the next beat-up the end P from the new bobbin is severed and the pin 38 engaged by the latch portion 92b to retire the temple knife 32.

The timing of the above operations is such that the end P will be severed just before the Stafford thread cutter engages the end P from the empty bobbin and therefore, the Stafford thread cutter could be eliminated. If the Stafford thread cutter is eliminated a tall can should be provided to catch the empty bobbin and the end attached thereto. It should also be noted that the loom will be stopped if the Stafford thread cutter does not operate on what is known in the trade as a false change since the end F will be cut by the temple knife 32 thus preventing seconds due to a short pick.

While a preferred embodiment of my invention has been described using specific terms, such description is for illustrative purposes only, and it is to be understood that changes and variations may be made without departing from the spirit or scope of the invention as defined by the appended claims.

We claim as our invention:

1. An attachment for an automatic temple knife for a loom having automatic bobbin change mechanism including a transfer rod, comprising an elongated resilient clement fixed on one end remote from the temple knife, a latch arm carried by said resilient element adjacent the other end thereof normally holding the temple knife in inoperative position, earn means actuated in response to rotation of the transfer rod for overcoming the resilience of the elongated resilient element thereby releasing the temple knife from the latch arm permitting two cutting operations prior to its again being engaged by and returned to inoperative position by the latch arm.

2. An attachment for an automatic temple knife for a loom having automatic bobbin change mechanism comprising a latch arm adapted to engage the temple knife normally holding same in inoperative position, an elongated resilient element on which the latch arm is carried. a cam portion formed by a portion of said elongated resilient element, a follower engaging said cam portion and linkage means for moving said follower responsive to actuation of the automatic bobbin change mechanism for overcoming the resilience of the elongated resilient element whereby, the temple knife is released by said latch arm upon actuation of the automatic bobbin change mechanism permitting two cutting operations of the temple knife prior to being returned to inoperative position.

3. An attachment for an automatic temple knife for a loom having automatic bobbin change mechanism including a transfer rod comprising an arm adapted to be fixedly connected to the transfer rod, a shaft pivotally connected adjacent one end to the free end of the arm, means supporting the shaft intermediate its ends, an

greases anti-friction element carried adjacent the free end of the shaft, an elongated, resilient member fixedly mounted on one end of the templ: knife housing and being supported adjacent the other end by the anti-friction element, a cam portion integral with said resilient mem her and a latch arm integral with said cam portion adapted to hold said temple knife in inoperative position whereby, upon actuation of the automatic bobbin change mechanism the anti-friction element will be moved against the cam portion to cause the latch arm to free the temple knife allowing it to be placed in operative position.

4. An attachment for an automatic temple knife for a loom having an automatic bobbin change mechanism including a transfer rod comprising an arm adapted to be removably connected to the transfer rod, a shaft pivotally connected adjacent one end to the free end of the arm, means supporting the shaft intermediate its ends, an anti-friction element carried adjacent the free end of the shaft, an elongated, resilient member mounted on one end on the temple knife housing being supported adjacent the other end by the anti-friction element, a cam portion integral with said resilient member, a latch arm integral with said cam portion adapted to hold said temple knife in inoperative position and an abutment above and adjacent the medial portion of said resilient member whereby, upon actuation of the automatic bobbin change mechanism the latch arm will free the temple knife allowing it to be placed in operative position.

5. An attachment for an automatic temple knife for a loom having automatic bobbin change mechanism including a transfer rod comprising an arm adapted to be removably connected to the transfer rod, a shaft pivotally connected adjacent one end to the free end of the arm, means supporting the shaft intermediate its ends, a bifurcated portion carried by the free end of the shaft, a roller element rotatably mounted in said bifurcated member, an elongated, resilient member fixedly mounted on one end on the temple knife housing said resilient member being supported adjacent the other end by the roller element, a cam portion integral with said resilient member, a latch arm integral with said cam portion adapted to hold said temple knife in inoperative position, an adjustable abutment above and adjacent the medial portion of said resilient element for varying the pressure exerted by the resilient member against the roller element so that upon actuation of the automatic bobbin change mechanism the latch arm will free the temple knife allowing it to be placed in operative position so as to permit a first cutting action of the temple knife to sever the end from the empty bobbin prior to its being cut by the automatic bobbin change mechanism, and a curved terminal portion integral with the latch arm adapted to act as a guide to facilitate the engagement of the temple knife by the latch arm after a second cutting operation which serves to sever the end from the new bobbin.

6. An attachment for an automatic temple knife for a loom having automatic bobbin change mechanism including a transfer rod comprising an off-set arm adapted to be removably connected to the transfer rod at any desired point thereon, a shaft pivotally connected adjacent one end to the free end of the arm, means for adjusting the point of pivotal connection along the shaft, means supporting the shaft intermediate its ends, means for vertically adjusting the means supporting the shaft, :1 bifurcated portion carried by the free end of the shaft, a roller element rotatably mounted in said bifurcated member, an elongated, resilient member adjustably positioned on one end on the temple knife housing being supported adjacent the other end by the roller element, a cam portion integral with said resilient member, a forwardly and downwardly depending latch arm, having a curved terminal portion to act as a guide to facilitate engagement of the temple knife by the latch arm into inoperative position, an adjustable abutment above and adjacent the medial portion of said resilient member whereby, upon actuation of the automatic bobbin change mechanism the latch arm will free the temple knife allowing it to be placed in operative position.

7. An attachment for an automatic temple knife as set forth in claim 6, including a plate adapted to be removably positioned on the temple knife housing for carrying said resilient member, means for supporting said shaft and said abutment.

1,214,385 Stimpson

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