US2564748A - Picking shoe - Google Patents

Description

g 21, 1951 w. A. BLANCHARD 2,564,748 PICKING SHOE I Original Filed Feb. 2, 1949 gray/1111111171111 36 w I INVENTOR WILLIAM A. BLANGHARD @M. T M

ATTORNE Y Patented Aug. 21, 1951 to Crompton &" Knowles Loom Works; Worc'es-' ter, Mass, a corporation of Massachusetts- Continuationof application Serial No. 74,059, FebruaryZ, 1949. This application February 18, 1950, Serial No; 145,065

3-' Glaims. 1

This is a continuation of my co-p'endiiig application Serial No. 74,059, filed February 2, I949,

now abandoned.

This invention relates to improvements in picking shoes for looms and it is the general object of the invention to construct the picking shoe in such manner as to reduce breakage incident to loom operation.

A well-known type of pickin mechanism employs a roll mounted on and revolving around the bottom shaft of a loom to strike the cam face of a picking shoe rigidly connected to one end of a picking shaft the other end of which supports a power arm. The shoe, shaft and arm parts are all rigid with each other and when the roll strikes the shoe these parts must all be moved instantly. This subjects the shoe to a sharp blow which when repeated during loom operation is likely to cause shoe breakage.

It is an important object of the present invention to provide a picking shoe having a pocket in which is mounted a resilient means having engagemerit with the shaft or some part of it for the purpose of permitting a limited movement.

of the shoe relatively to the shaft when the shoe is first struck by the roll. By this arrangement the instantaneous resistance and reaction of the shoe to movement by the roll is measured largely by its own weight and not by the weight of: the shaft and other parts connected to it as has been the case heretofore. This use of the resilient means results in a reduction in the breakage of picking shoes.

It is occasionally desirable to be able to move the picking shoe alongthe picking shaft to time the start of picking with respect to the cycle of the loom. It is a further object of the invention to provide a picking shoe so constructed that it can be adjusted lengthwise of the picking shaft and carry the aforesaid resilient means with it so that said means is effective to reduce picking shoe breakage whatever the position of the latter may be along the picker shaft.

Fig. 3 is an enlarged vertical section on line 3-3, Fig. 2,

. connect the top and bottom shafts and cause 2 Fig. 4 is a longitudinal vertical section on line 4-4, Fig. 3,

Fig. 5 is a horizontal section on line 5-'-5, Fig. 3,

Fig. 6 is a view similar to Fig. 5, but showing a modified form of the invention, and

Fig. 7 is a transverse vertical section on line 1.1, Fig. 6'.

Referring particularly to Fig. 1, a loom frame i9 supports top and bottom shafts II and I2, respectively, and has a lay l3 mounted on lay swords one of which is shown at M. A shuttle box IE on the lay contains a shuttle S which is picked from the box by movement to the left, Fig. l, of a picker stick l6 pivoted at I! to a rocker iron is secured to a rocker shaft I9 located in low position in the loom. Top and bottom gears 20 and 2|, preferably in the ratio of 1 to 2,

them to turn in synchronism during loom operation.

Secured to the bottom shaft I2 is a picking actuator, designated generally at 25, comprising an arm 2%: integral with a hub 21 secured as at 28 to the bottom shaft. A stud 29 on the outer end of arm 26 has a picking roll 30 rotatably mounted thereon. During loom operation shaft l2 rotates once every second pick of the loom and moves the picking roll in a circular path in the direction of arrow at, Fig. 2.

The picker stick is engaged by a lug strap 3! connected to a sweep stick 32 connected at 33 to the upper end of a power arm 34. The latter has a hub 35 which is secured to a picking shaft designated generally herein at 36. is mounted for rocking in front and back bearings 3'! and 38 on the loom frame.

Except as noted hereinafter with respect to the picking shaft 36 the matter thus far described is of common construction and may operate in the usual manner.

In carrying the preferred form of the present invention into effect I provide an improved form of picking shoe designated generally at 43 and including in its construction a cam 4| for engagement with the roll 30. i This cam is connected by a web 42 .or similar structure to a hub 43 having an internal cylindrical bore 64 which communicates with a pocket 45 running lengthwise of the hub and bore 44.

The shaft 33 has spaced screw threads 5!! and 5| cut externally thereon between which is located a smooth cylindrical bearing part 52 which extends through the bore 44. The shaft is provided with a key slot 53 in which is located a key 54 which extends beyond the periphery of the bearing part 52 and into part of the pocket 45.

This shaft- The key does not fill the pocket and that part of the pocket to the left of the key as viewed in Fig. 3 is occupied by a resilient member 55 which in the preferred form of the invention may be a body of soft elastic rubber. This body of rubber may be retained in the left hand portion of the pocket as viewed in Fig. 3 by having its left edge 55 cemented to the adjacent wall 51 of the pocket.

That part of the key which projects into the pocket has a surface 60 normally engaging a wall 6| on hub 43 defining the right end of the pocket 45 as viewed in Fig. 3. The top of the pocket may be arcuate as at 62 and preferably though not necessarily concentric with the bore 44. The body 55 of rubber is preferably normally under some compression and has its right edge 63 as viewed in Fig. 3 held firmly against the adjacent edge 64 of the key.

In the operation of the preferred form of the invention the normal tendency of the body 55 to expand will hold the key edge 60 against wall 6!, as shown in Fig. 3. When the picking roll 30 strikes the cam 41 the picker shoe 40 will be rocked in a clockwise direction as viewed in Fig. 3, thereby placing the elastic body 55 under additional compression and communicating a force through it to the key 54. During this compression of the elastic body the wall 6! of the pocket will move slightly away from the surface or side 58 of the key due partly at least to the inertia of the shaft 36, the power arm 34, and parts associated with the latter. At the instant of impact with the roll the shoe will be the only part which will start to move, and it will turn slightly on bearing part 52 of shaft 35. As the roll continues to move along the cam the elastic body 55 Will start rotation of the shaft 36 and eventually cause the latter to move in a clockwise direction as viewed in Fig. 3 to give the power arm 34 a working stroke the effect of which is to move the picker stick to the left as viewed in Fig. 1.

Movement of the picker stick is resisted by the weight of the shuttle S, and this resistanc may keep the surfaces 69 and GI spaced from each other a slight distance during the greater part of the picking operation. As the shuttle is finally delivered from the shuttle box and the picking roll reaches the upper'end of the cam 4| the rubber will expand and move th key against the right side of the pocket to the position shown in Fig. 3. Well-known means will then return the picker stick to its normal outward position as shown in Fig. 1 with the key and elastic body 55 in position for the next picking operation.

In assembling the picking shoe on shaft 36 a nut G5 and lock nut 6'5 are threaded on screw threads 5i and key 54 is then inserted into slot 53. Hub 43 is then slipped over screw threads 50 and along bearing 52 and theelastic body 55 will slide along surface 64 of the key. Nut 67 and lock nut 68 are then threaded onto screw threads 53 until a slight clearance 69 exists between the right end of the hub 43 and nut 65, see Fig. 4. This will permit turning of the hub 43 on bearing part 52 of shaft 35.

Nuts 55 and 61' are adapted for limited adjustment along their respective screw threads in the direction of the length of the shaft 35 to locate the picking shoe cam in differently timed positions relativel; to roll 39. When the nuts 65 and 6B are adjusted along the length of the shaft the key 54 will move in the slot 53, and the elastic body 55, being preferably though not necessarily cemented in the pocket, will also move with the hub and the operative relation between the clasaccording to prior practice.

tie material and the key already described will be maintained for all longitudinally adjusted po sitions of the shoe along the picking shaft.

The modified form of the invention shown in Figs. 6 and 7 is similar to that already described except that in place of the elastic body 55 I use a fiat stiff metallic spring 15 having a straight central part 16 to engage the wall 57 of the pocket 45 and having offset ends 11 to engage the surface 64 of the key. This spring is normally under some stress to hold the key as shown in Fig. 7, and at the start of a picking operation this spring is placed under additional stress as hub 43 has a slight angular movement relatively to shaft 35. Thereafter the parts act substantially as already described for the preferred form.

In both forms of the invention the blow which the picking roll 30 strikes the cam 41 is required initially to move only the picking shoe without necessarily moving the shaft 36 and parts connected to it. It is for this reason that the picking shoe can respond more readily and therefore with less shock to the blow of the roll than is possible in picking shoes of this general type made The picking shoe is not obliged to transmit all of the force necessary to set the entire picking mechanism into operation at the very beginning of the picking stroke when the roll first engages the cam 4 l. The gradual pick-up of the picking load made possible by the yielding member or means 55 in the picking shoe reduces breakage of the latter.

From the foregoing it will be seen that the invention sets forth a simple form of picking shoe containing a resilient member, which may be either soft elastic rubber or a metallic spring, the effect of which is to enable the picking shoe to get into motion slightly before the picking shaft and the parts connected to it are moved. The initial force exerted by the picking roll on the shoe is therefore reduced and the likelihood of breakage is lessened. Furthermore, the picking shoe is so made that it can be adjusted along the length of the shaft 36 and both the key and the resilient member will move longitudinally with the hub 43 so that the previously mentioned relationship between these parts will be preserved for all adjusted positions of the shoe.

Having thus described the invention it will be seen that changes and modifications of the fore going specific disclosure may be made without departing from the spirit and scope of the invention.

What is claimed as new is:

1. In a picking shoe for a loom picking shaft having a cylindrical bearing part and. a key projecting beyond said bearing part, the shoe comprising a cam carrying hub having a bore to fit and move angularly on said bearing part of the shaft, the hub having a pocket therein communicating with the bore and extending lengthwise of the latter to receive said key at one side thereof, and a body of soft elastic material in said pocket at the other side thereof for engagement with the key and effective when the hub is fitted to said bearing part to hold the key at said one side of the pocket but yieldable to enable the hub to turn angularly on said bearing part.

2. In picking mechanism for a loom, a picking shaft having a cylindrical bearing part, a key on the shaft projecting beyond said bearing part, a picking shoe formedwith a cam carrying hub having a bore fitting and movable angularly on said bearing part of the shaft, the hub having a pocket therein communicating with the bore and extending lengthwise of the latter and receiving said key at oneside thereof, and a body of soft elastic material in' said pocket cemented to the hub at the other'side of said pocket engaging the key and normally. under compression to yieldingly hold the key against the hub atsaid one side of the pocketfsaid elastic material being capable of additional compression to enable that part of the hub at said one side of the pocket to move away fromsaid key.

3. In picking mechanism for a 100m, a picking shaft having spaced external screw threads, adjusting nuts threaded on said screw threads for adjustment longitudinally of the shaft, a key on the shaft between" the nuts, a picking shoe provided with a cam iiarrying hub movable angularly on the shaft between said adjusting nuts and capable of endwise movement on the shaft, and a body of soft elastic material cemented to the hub and operatively interposed between the latter 6 and the key and normally holding the hub against the key but yieldable to permit angular movement of the hub with respect to the shaft and movement of the hub out of engagement with the key, said elastic material moving with the hub along the length of the shaft when said adjusting .nuts are altered to change the location of the hub along the shaft.

WILLIAM A. BLANC'HARD.

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

UNITED STATES PATENTS

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