US2894540A

US2894540A - Hydraulic check device for looms

Info

Publication number: US2894540A
Application number: US638038A
Authority: US
Inventors: Zarn Adolphe Emile
Original assignee: Individual
Current assignee: Individual
Priority date: 1956-02-04
Filing date: 1957-02-04
Publication date: 1959-07-14
Anticipated expiration: 1976-07-14

Description

July 14, 1959 A. E. ZARN 2,894,540

HYDRAULIC CHECK DEVICE FOR LooMs Filed Feb. 4/1957 2 Sheets-She 1 INVENTOR. ADOL PHE EMILE ZARA] ATTG HEY y 19.59 A. E. ZARN 2,894,540

HYDRAULIC CHECK DEVICE FOR LOOMS I Filed Feb. 4, 1957' 2 Sheets-Sheet 2 INVENTOR. AooLPHs Emu: Zmw

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ATTORNEY m as edt s This invention relates to loom shock damping devices, more particularly to hydraulic'shuttle check devices, specifically adapted for use on multiple box looms.

The shock load and noise produced by impact of the shuttle on the picker in conventional loom installations is such as to adversely aifect the operation of the machine, as well as the efliciency of the mill workers. In an attempt to eliminate this shock load and noise, a variety of expedients has been devised. Most efiective of these expedients is some form of hydraulic shock damper, check or stop, which is arranged to damp the vibrations of the picker stick in its oscillatory motion. With so-called multiple box looms, where a plurality of shuttles is employed and maintained in a change box at the side of the loom lay for feeding one at a time by the picker stick it has been relatively impossibleto apply any check or stop to the picker stick. This is due to the fact that the conventional picker has a recess formed in its side facing the shuttle. Before the change box may be moved to permit interchange of the shuttle, it is necessary that the shuttle be released from the picker i.e. disengaged from the recess thereof and it is thus necessary that the picker stick move beyond the point of stoppage of the shuttle.

It is with the above problems in mind that the present construction has been evolved, a construction providing an improved hydraulic damping structure for stopping or checking the motion of the picker stick and shuttle on a multiple box loom. The novel means is readily adaptable to conventional multiple box looms, without interfering with shuttle exchange by the change box.

It is accordingly a primary object of this invention to provide an improved hydraulic shuttle check device for use on multiple box looms.

An additional object of this invention is to provide an improved loom check device readily applicable to conventional and existing multiple box looms.

A still further object of the invention is to provide an: improved hydraulic check device for multiple box looms which is simple of manufacture, readily installable On existing looms, and requires minimum maintenance when installed. a r Y i These and other objects of the invention are achieved by provision of a check device comprising a piston positioned within a fluid-containing cylinder. The piston extends outwardly to a buflier head, against which the picker stick moves. Under the pressure of the picker stick the piston is pressed into the fluid-containing cylinder, thereby displacing some of the fluid through a narrow opening provided therein. The stroke of the piston is such that only a portion of said stroke is employed for checking the motion of the picker stick. After the shuttle is stopped, the piston may be moved by means of members driven by the loom drive to the extreme limit of its stroke in the cylinder and the picker stick following this movement may thus release the shuttle to permit a move- Patent C Patented Ju ly 14, 1959 ice ment of the change box to bring another shuttle into position in front of the picker.

A primary feature of this invention resides in the fact that a hydraulic check device has been provided, in which only a portion of the piston stroke is employed for checking the motion of the shuttle, with the remaining portion of the piston stroke employed to release the shuttle to permit a shuttle exchange.

The novel structure, and its mode of functioning will be made most manifest and particularly pointed out in conjunction with the accompanying drawings, wherein:

Figure 1 represents a partial schematic view of a loom with the hydraulic check device shown in partial cross section with the picker stick in position adjacent a change box just prior to stoppage of a shuttle; and

Figure 2 is a partial schematic view similar to Figure 1, with the picker stick and other components shown in a position after a shuttle is stopped; and

Figure 3 is a partial schematic view similar to Figure 1, illustrating the novel components of this invention in a position after release of the stopped shuttle by the picker.

Figure 3a represents a schematic view of the picker stick, arrangement; and

Figure 4 is a partial schematic side view of a loom provided with a modified form of the invention.

Referring now more particularly to the drawings, like numerals in the various figures will be taken to desig- :nate like parts. 4

As viewed in the drawings, a plurality of shuttles 1 is :shown positioned in a change box B (illustrated in dot dash line in Figure 1). A picker stick 2 having a picker 3 oscillates to and fro a conventional manner to drive v *the shuttles 1. Recess 3a is formed in picker 3 by repeated impact of the pointed noses of the shuttles 1, during operation of the loom. I

A supporting arm 6 connected to the lay 16 in manner mot shown has attached to the free end thereof a cylinder 10 within housing 13. Reciprocably positioned within -the cylinder 10 is a piston 11. The piston 11 acts against a conventional brake fluid 9. The brake fluid 9 does not completely fill the housing 13, thus providing an air (cushion 7 above the fluid. Filling of housing 13 with the brake fluid is accomplished through normally closed inlet port 8 at the top of housing 13. The cylinder 10 extends into housing 13, and ports 10a formed in the cylinder wall permit entry and egress of the fluid '9 from the cylinder through to the reservoir formed within housing 13. Drainage screw 12 permits opening of a port at the bottom of the housing for drainage of the fluid 9, when dsired, as for purposes of adjustment or maintenance. A wrist pin, having a cam 14 thereon, is employed for coupling a buffer head 15 to the piston 11. Buffer head 15 is adjustably mounted in connection with the wrist pin and piston 11, as readily seen in the drawing.

The loom lay 16 is schematically illustrated to the left of the figures, and the shuttles move thereacross in conventional fashion.

Lever 25 is centrally pivoted to supporting arm 6. The lever 25 is so pivoted that there is a relatively long upwardly extending arm 25a, and a downwardly extending arm 25b having a cam follower surface formed there- Coupled to the free end of the upwardly extending arm 25a is a flexible connection 4 formed of rope, cable, or the like. As schematically seen in Figure l flexible connection 4 is connected to the stationary loom framework supporting the loom lay 16 and passes over a roller on lay 16, whereby the position of lever 25 is affected by the movement of lay 16.

As will be seen from Fig. 3a the picker stick 2, pivotalhand dotted line position, as viewed in Figure 1.

not interfere with the box exchange.

1y connected with its lower end to the machine frame 21 as indicated at 18, is constantly urged toward the buffer head 15 under the action of a spring 20, connected therewith over a flexible member 19.

- Operation The novel checking structure functions in a manner as mostclearly illustrated in the drawings.

As seen in Figure 1, picker stick 2 moves against buffer head 15 to force piston 1 1 into the cylinder. Thestroke of piston 11 comprises two portions. As noted on the drawing, there is a checking portion S and a shuttle releasing portion S The total stroke .of ,the piston 11 within cylinder 10 is equal to S plus As will be seen from the drawing, the relation between the clearance of thevpiston in the cylinder and the ,viscosity of the brake fluid is chosen such, that for a given amount of kinetic energy to be absorbed by the device, the checking portion S of the stroke terminates intermediate the .operative length of the cylinder bore, thus permitting theremainder S of the stroke to be employed for release of the shuttle.

As seen in Figure 1, a shuttle 1a is shown moving .from the loom lay 16 to be received in the change box B. The checking of the shuttle is accomplished after the nose of shuttle 1a engages in recess 3a of picker 3, thus permitting the motion of shuttle in to force picker stick 2 to the intermediate position shown by dot dash lines. ,When'the picker stick 2 is in this intermediate position, piston 11 has moved through a distance S and themotion of the shuttle 1a will have been checked. At this time, the shuttle is inits proper position within change box B, as seen in Figure 2.

In order to permit a shuttle exchange i.e. to bring another shuttle into operative position, it is necessary that picker 3 be disengaged'from the tip of shuttle 1a. To this end, the motion of lay 16 causes flexible connection 4 to pull on arm 25a, thus forcing arm 25b against cam 14, which forces the piston 11 through the shuttle releasing portion of its stroke S to the position, as viewed in Figure 3. The picker stick moves to the extreme. right- The ;picker stick 2 moves with buffer head 15 underthe effect of a spring 20, shown in Fig. 3a.

It is thus seen that a hydraulic check device has been provided, eminently suitable for use in conjunction with multiple box looms, whereby the checking action does The shuttles are checked in their motion by a force directly proportional to the veloicty of the shuttle, and each of the shuttles received bythe picker head is stopped atthe same relative position.

The simple construction, and relatively small volume of the described check device permits its employment in conjunction with any type of known existing multiple box loom.

In the modification of the device shown in Fig. 4, the actuating movement of the lever 25 for retraction of the piston 11 over its stroke portion S is not derived from ment, but-from-a driven shaft 22 supported in the mathe motion of the lay 16, as in the foregoing embodi- 6O chine frame 21. This shaft carries a cam 27 with which the one arm of a lever 23 carrying a follower roll 24 cooperates. The other arm of the lever 23 pivotably supported on a trunnion 28 of the machine frame, is hingedly connected with a rod 26, the other end of which is connected to the arm 25a of lever 25. Since the shaft 22 rotates in synchronism with the movement of the lay 16, the actuation of the lever 25 will be effected in dependency ,of the movement i.e. position of the lay, as will be clear to those skilled in the art.

The above disclosure has been given by way of illustration and elucidation, and not by way of limitation, and it is desired'to protect all embodiments of the herein disclosed inventive concept within the scope of the appended claims.

What is claimed is:

1. On a loom having a lay, a shuttle, and a picker stick: a hydraulic check device cushioning movement of the picker stick, said device comprising: a fluid containing housing beneath the lay of the loom; a cylinder within said housing; a piston reciprocably mounted within said cylinder to move through a stroke with a checking portion and a shuttle releasing portion, said piston having a free end extending from said cylinder; a buffer on the free end of said piston, said buffer contacting the picker stick; and a linkage between said piston and the loom for moving the piston through the shuttle releasing portion of its stroke after it has completed the checking portion of its stroke, whereby the shuttle will be released from the picker stick.

2. Apparatus as in claim 1, in which said linkage is effected by a driven part of the loom.

3. Apparatus as in claim 1, in which said linkage comprises: a lever fulcrumed at its center, one arm of said lever cooperating with said piston; and a flexible connection between the other arm of said lever and the loom said connection acted on by the lay.

4. Apparatus as in claim 3, in which said piston has a cam surface thereon contacted by the said one arm of said lever.

5. Apparatus as in claim 3, in which said flexible connection extends from a fixed portion of the loom, overa driven part of the loom to the other arm of said lever, whereby motion of the driven part of the loom effects the position of said picker stick.

6. Apparatus as claimed in claim 1, in which said linkage comprises a fulcr-umed actuating lever cooperating with said piston, a cam seated on a driven shaft of the loom, and motion transmitting means cooperating with said cam and connected to said lever to thereby displace said piston in dependency of the motion of the loom.

References Cited in the file of this patent UNITED STATES PATENTS 2,354,340 Utter July 25, 1944 2,483,517 Balogh Oct. 4, 1949 2,7 3,8 5 Z ly 0, 9

FOREIGN PATENTS,

572,109 Great Britain Sept. 24, 1945