US2878840A

US2878840A - Checking device

Info

Publication number: US2878840A
Application number: US641918A
Authority: US
Inventors: Robert L Carroll
Original assignee: Individual
Current assignee: Individual
Priority date: 1957-02-25
Filing date: 1957-02-25
Publication date: 1959-03-24
Anticipated expiration: 1976-03-24

Description

March 24, 1959 CARRQLL 2,878,840

' CHECKING DEVICE Filed Feb. 25, 1957 VENTOR.

Rosam- L. CARROLL A 7'7'ORNE Y United States 6 Claims. (Cl. 139-167) This invention relates to looms and more particularly to a checking device for use therewith.

Checking devices currently employed in the operation of checking the action of the picker stick when receiving a shuttle generally include a check strap arrangement which employs the friction generated by the strap as the checking means. As is well known to those skilled in the art of weaving, such checkingdevices are subject to many disadvantages. A variation in humidity or firming up of the check strap following a weekend shutdown may produce an irregular checking motion due to variations in friction exerted by the check strap. These devices employing check straps require frequent adjustment and are subject to rapid wear occasioning the necessity for frequent replacement. One of the chief drawbacks to the use of check straps is the fact that the irregular checking action exerted thereby often causes improper boxing of the shuttle. of the shuttle invariably produces broken picks, slack picks, and otherwise produces seconds for a number of reasons. This improper boxing is a major deterrent to the operation of looms at higher speeds.

Accordingly, it is an object of this invention to improve the boxing. of loom shuttles by providing an improved checking device.

An important object of this invention is the provision of a checking device which will exert a positive checking action at all times thus avoiding an irregular checking actions i a Another object of this invention is to provide a checking device which will be located near the top ofthe picker stick so as to minimize the strain exerted on the picker stick during checking.

Still another object of my invention is to provide a checking device which is of simple construction and which will require a minimum of adjustment and maintenance and which will be subject to a minimum of wear.

The construction designed to carry out the invention will be hereinafter described, together with other features thereof.

The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawing forming a part thereof, wherein an example of the invention is shown and wherein:

Figure 1 is an elevation showing the right-hand side of the loom, with parts omitted, and showing a checking device constructed according to the present invention operably associated therewith,

Figure 2 is a sectional plan view taken along line 2-2 in Figure 1,

Figure 3 is an elevation similar to Figure 1 showing the various parts of the device constructed in accordance with the present invention in position following a checking operation, and

Figure 4 is an enlarged perspective view looking from This improper boxing atent ICC 2 the front right-hand side of Figure 3 showing a portion of the checking device.

Referring more particularly to the drawing, the numeral 10 designates the frame of a loom which may' be of any standard construction. The lay is designated by the numeral 11 and a standard picker stick 12 carrying the usual picker 13 is shown operatively associated with the lay 11. The usual lug strap 14 imparts power operation and to move the lever arm or link D so asto compress the compression spring E. It will be noted that when the picker stick 12 contacts the saddle arm B that the force exerted on the picker stick 12, when a shuttle is received by the picker 13 and the usual binders 15, is transmitted through the turning of the cam C to the link D which acts to compress the spring E where such shock is absorbed in a positive manner.

Referring now particularly to Figures 1 and 3, it will be seen that the bracket A is generally angular in shape having a vertical lower leg 16 and an upper horizontal leg 17. The upper horizontally disposed leg 17 is secured to the underside of the lay as by bolts 18. The

,lower vertically disposed leg 16 carries a downwardly projecting portion 19 and the lower portion of the saddle the screws 24.

arm B is pivotally carried adjacent its lower end by the lower portion of the leg 16 as at 20. The upper portion of the saddle arm carries suitable means forengaging the picker stick 12 in the form of a bifurcated portion'21 which is connected thereto as by the integral lateral arm 22. The inner surface of the bifurcatedv portion is provided with a leather, rubber, or other suitable wear resistant means 23 A suitable positive connection in the form of a flexible element which may be a composition rubber toothed belt 25 is secured adjacent the saddle head 21 as by the screw 26 to the top of the arm B, and to the drum .28 which. carries the cam C as by: the screw 27. The belt 25 is fastened to the saddle arm B so that the teeth of the belt 25 engage notches 26a in the upper end of the saddle arm. The drum 28 is oscillatably mounted on the stub shaft 29 which is secured to the bracket A as by the nut 30. The cam C is fixedly positioned on the drum 28 as by the screw 31 and screw 32 which passes through a slot 33 so as to provide adjustment for the cam C.

A cam follower 34 is adapted to engage the surface of the cam C at all times and is oscillatably carried as at 35 adjacent the free end of the link D. The link D is pivotally carried by the bracket A as at 36 on the left-hand side thereof. Suitable shock absorbing means in the form of the compression spring E is positioned below the medial portion of the link D and is provided with a cap 37 for engaging the link D. The lower portion of the spring is positioned in a base 38 carried by the threadable element 39 which passes through an abutment 40 which is suitably fixed to the bracket A. The threadable element 39 may be threadably adjusted by turning the bolt 41 and then fixed in a desired position by engaging the lock nut 42.

It will be noted that an adjustable stop 43 is provided for the saddle arm B. The adjustable stop 43 is carried by the threadable element 44 which is threadably mounted Patented Mar. 24, 1959 which is secured thereto by in the abutment 45 carried by the bracket A and is adjusted by the nut 46 and fixed in a desired position by the lock nut 47. A tension spring 48 is attached on one end thereof to the drum 28 as :by the wire 49 and is fixed at its other end on a pin 50, carried by the bracket A. The wire 49 is positioned within agroove 281: near the inner edge of the drum 28 and is fixed to the drum by the screw 490:. This spring is provided to assist the cam C and the saddle arm B to return to the starting or ready position shown in Figure 1 following a forward power stroke of the picker stick 12.

The periphery of the lower segment of the cam C, as shown in Figure 1, should be slightly shorter thanthe run of the picker stick afterengagement with the saddle arm B and the rise of the .cam will beconstant for this lower segment of the cam. The upper segment of the cam should be reduced almost to a truecircle to preclude the possibility of backlash and so as to develop sufiicient drop to assist .the saddle arm to return to starting position. The cam C may be constructed with sufficient drop so as to return the saddle arm'B'without the use of the spring 48 and associated parts or a gripping arrangement may be employed such as between the picker stick 12 and the saddle arm B to utilize the forward stroke of the picker stick to return the arm.

While a preferred embodiment of the 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 following claims.

What is claimed is:

1. A checking device for a loom having a lay and a picker stick including, a cam carried by the lay, a link pivotally carried on one end thereof by the lay remote from the cam, a cam follower carried by said link, means operatively connecting the cam and the picker stick, and shock absorbing means actuated by the movement of the link during a checking stroke of the picker stick.

2. A checking device for a loom having a lay and a picker stick including, a cam carried by the lay, a link pivotally carried on one end thereof by the lay remote from the cam, a cam follower carried by said link, means operatively connecting the cam and the picker stick, and resilient means normally urging said cam follower into engagement with said cam actuated by the movement of the link during a checking stroke of the picker stick.

3. A checking device for a loom having a lay and a picker stick including, means carried by the lay engaging the picker stick, cam means actuated by said means engaging the picker stick, and a compression spring actuated by said cam means during a checking stroke of the picker stick to absorb the shock imparted to the picker stick during checking.

4. A checking device for a loom having a lay and picker stick including, a bracket carried by the lay, means engaging the picker stick during checking carried by said bracket, a cam carried by the bracket, means operatively connecting said cam and said means engaging the picker stick, a link pivotally carried by said bracket adjacent one end thereof, a cam follower carried by said link, and shock absorbing means carried by said bracket engaging said link normally urging said cam follower into engagement with said cam, whereby during a checking stroke the picker stick will be engaged and the force exerted on the picker stick dissipated by said shock absorbing means.

5. A checking device for a loom having a lay and picker stick including, a bracket carried by the lay, an arm pivoted adjacent the lower end thereof on said bracket, means engaging the picker stick during chec'kingpositioned adjacent the top of the arm, a cam carried by the bracket, flexible means operatively connecting said cam and said arm, a link pivotally carried by said bracket adjacent one end thereof, a cam follower carried by said link, and shock absorbing means carried by said bracket engaging said link normally urging said cam follower into engagement with said cam, whereby during a checking stroke the picker stick will be engaged and the force exerted on the picker stick dissipated by said shock absorbing means.

6.. A checking device for a loom having a lay and picker stick including, a bracket carried by the lay, an

aarmpivoted adjacent the lower end thereof on said bracket, ,means engaging the picker stick during checking positioned adjacent the top of the arm, a cam oscillatably carried by the bracket, flexible means operatively connecting said cam and said arm, a link pivotally carried :by said bracket adjacent one end thereof, a cam follower carried by said link, and a compression spring carried by said bracket engaging said link normally urging said cam follower into engagement with said cam, whereby during a checking stroke the picker stick will be engagedand the force exerted on the picker stick dissipated by said compression spring.

References Cited in the file of this patent UNITED STATES PATENTS