US2813549A

US2813549A - Shuttle picking mechanism for weaving machines

Info

Publication number: US2813549A
Application number: US388958A
Authority: US
Inventors: Pfarrwaller Erwin
Original assignee: Sulzer AG
Current assignee: Sulzer AG
Priority date: 1952-11-03
Filing date: 1953-10-29
Publication date: 1957-11-19
Anticipated expiration: 1974-11-19

Description

Nov. 19, 1957 E. PFARRWALLER 2,813,549

SHUTTLE PICKING MECHANISM FOR WEAVING MACHINES Filed Oct. 29, 1953 2 SheetsShee 2 INVENTOR.

E E WIN PFAEIE'WALLEE,

ORNEY Unite States PatentO SHUTTLE PICKING MECHAN ISM FOR WEAVIN G MACHINES Erwin Pfarrwaller, Wintertliur, Switzerland, assignor to Sulzer Freres, S. A., Winterthur, Switzerland, a corporation of Switzerland The present invention relates toa shuttle picking mechanism for weaving machines in which the picking force is supplied by a power accumulating means and in which a picking lever is held in picking position against the action of the accumulated power by means of a toggle joint The. present application is a continuation-in-part of my copendingapplication Ser. No. 388,957, filed'October 29; 1953, now U. S. Patent No. 2,777,472.

It. is an object of thepresent invention to provide a shuttle picking mechanism for looms including a shuttle picking element, power accumulating means connected with said element, toggle joint means for holding the picking element in picking position against the action of the power accumulated in the power accumulating means, and cam means operated by theloom drive for actuating the toggle joint means.

The aforementioned cam means and toggle joint means are preferably individually provided with a cam surface portion, one surface portion being for the purpose of moving the toggle joint from bent position through extended position into the position for holding the picking element or lever in picking position against the action. of the accumulated power, the other surface portion being.

for the purpose of returning the toggle. joint at least so far beyond its extended position that the toggle joint' is bent.

The novel features which are considered characteristicof the inventionare set forth withparticularity in the appended claims. The invention itself however and additional objects and advantages thereof will best be under stood from the following description of an embodiment thereof when read in connection with the accompanying drawing in which Fig. l is a diagrammatic perspective part sectional view of a shuttle picking mechanism accordingto the invention;

Fig. 2 is an elevation of the toggle joint and cam actuating it of the mechanism according to Fig. 1, in released position.

The same numerals designate the same parts in all figures.

Referring more particularly to the drawing, numeral 1 designates a casing for the picking mechanism, which casing is connected to the frame of the loom, not shown. The casing 1 supports a hollow shaft 2 in bearings 3. A picking lever 4 is connected by means of a round wedge 4a to the shaft 2, the picking lever picking a shuttle 11 by means of a pin 7 fast on a slide 8 and guided by a link 6 which is pivoted by a pin to the picking lever. The slide 8 slides on a rail 9 which is mounted on the casing 1. The head 18 of the pin 7 abuts against the rear end of the shuttle 11 which is in picking position in a shuttle lifter 12 when the picking lever 4 is in the illustrated picking position. If the lay is in the rear position shown, guide teeth 13 mounted with the reed 14 on the lay 15 form the shuttle path. Support and operation of the lay 15 are conventional and not illustrated.

The shuttle lifter12 is positively driven inth'ecdn ventional-manner to rotate about an axis 16 from the" horizontal position shown, for example, to a vertical position in which it receives anew shuttle.

A torsion rod spring 19 which is knurled atits right end'extends longitudinally through the hollow shaft 2.

The left end of the rod is arranged inside of the shaft 2' and connected therewith by the pin 4a, the right end of* the rod engaging knurls in a bore of a flange 21 which is fast on casing 1.

Anarm 22 is mounted on the shaft2 so that it cannot rotate relatively tothe shaft 2, arm 22 being connected by a pin 23 with a link 24, the latter being connectedby a pin 27 with the upper armof a two-armlever 25 whichswings on a stationary shaft 26. The lower arm of lever 25 is connected by a pin 28 with alink pivoted: A cylinder 30for the latter is connected with the casing 1 and supports the to a brakepiston 29 (Fig. 2).

shaft 26.

A-roller 31 is supported inthe upper arm of the lever 25, the roller followinga surface portion 36 of a cam 32 fast on a shaft 33. The latter is rotated by a conical gear wheel 34 in a conventionalmanner by the main drive shaft of the loom which drive shaft is driven Shaft 33'makes' a through a clutch by the loom motor. full revolution for each pick.

The two-arm" lever 25 is provided with a transverse arm having acam surface 66, beginning at67 and grad' ually rising toward the outer endof the arm 65. The pin 69 which surface 66 isfollowed by a roller'68' on a is inserted in the cam 32.

Thede'vice operates as follows:

arm 22,1the shaft 2, and the picking lever 4 have been revolved-thereby in counter-clockwise direction and the picking lever 4 is now in picking position. The 'left end of the torsion rod spring 19 has been turned throughthe sameangle as" shaft 2 whereby the spring has been tensioned.

Sinceth'e to'ggle

joint

24, 25" is extended andin locking position; the tensioned spring 19 'cannot'rotate the shaft 2. The pin 27 is at the right of the line- 70, connecting the pin 23 and the shaft 26 and, because the link 35abuts against an abutment 71, the-force'accumulated in the rod 19'cannot'press the:

linkage

24,25 further to the right;

The abutment 71 is adjustablefor adjusting the picking position of the lever 4.

The picking lever'4 mustbe locked by the linkage" 24; 25 until a shuttle '11 istready to be picked, i. e. untilthe shuttle lifter 12 is moved to the picking position shown in Fig; 1 and the'shuttle clamp 42 has gripped a weft The shuttle 11 is prepared for the pick during the period :between two' weft thread in the conventional manner.

thread insertions so that the rshuttle is ready for the -pick shortly after the picking lever 4 has been moved into picking position.

To effect the pick, the

toggle joint

24, 25 must be released which is done by causing the roller 68 on cam 32 to press against the cam surface 66 on the arm 65 of the lever 25. Release is effected at the moment at which the roller 68 has reached the position 67 on the cam surface 66, because, at farther movement of the cam 32 in the direction of the arrow 40, the roller 68 presses the arm 65 downwards due to the rise of the cam surface 66 towards the shaft 33. The lever 25 is thereby turned counterclockwise and the joint 27 is moved from the position I Patented Nov. 19, 1957 shown in solid lines in Fig. 2 into the position II shown in dotted lines.

Upon reaching position 67 of the cam surface 66 by the roller 68, the nose 41 of cam 32 is so far removed from the roller 31 that the latter can move into the space above the nose 41 upon continued rotation of the lever 25. The joint 27 has so far traversed the line 70 in position II that the released

toggle joint

24, 25 begins to bend due to the action of the force accumulated in the rod spring 19. The shaft 2 and the picking lever 4 are now free to rotate in clockwise direction. After release of the picking device the power accumulated in the rod spring 19 rotates the shaft 2 and the picking lever 4 for accelerating the shuttle 11. A portion of the power is used for accelerating the masses of the lever 4, the shaft 2, and the

members

24 and 25 of the toggle joint.

The

elements

24 and 25 move from position II into the bent position shown in dash-dot lines in Fig. 2. During the second part of the movement the energy remaining in the moving means is braked by means of the brake piston 29 which is linked to the lever 25 and moves to the right. Upon entry of the piston 29 in the cylinder 72, the brake fluid therein is displaced and escapes through a port 73 and the seat 74 of a throttle valve 75 (Fig. 1). The position of the throttle valve is adjustable.

Since the release of the

toggle joint

24, 25 is effected by the

cam drive

31, 32, the power for initial acceleration of the masses to be moved for releasing the toggle joint is furnished by the cam drive. The power accumulated in the rod spring 19 serves principally only for accelerating the picking lever and the shuttle. This has the advantage that the capacity of the rod spring 19 can be smaller than in devices in which the power accumulator must also supply power for moving other elements than the picking lever and the shuttle. Since the brake piston 29 is linked to a member of the

linkage

24, 25, the mass of the piston is also accelerated by the cam drive. The construction of the lever 25 and of the link 24 also contributes to the reduction of the power required from the power accumulator. If the upper arm of the lever 25, i. e. the distance of the bolt 27 from the fulcrum 26, is almost twice as long as the link 24, small initial angular movements of the arm 22. correspond to great movements of the lever 25 so that the latter must be more accelerated at the beginning which is done by the cam drive.

, While a specific embodiment of the invention has been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, additions and omissions may be made therein without departing from the spirit and scope of the invention as set forth in the appended claims.

What I claim as my invention is:

1. A shuttle picking mechanism for weaving machines comprising a shuttle picking lever, power accumulating means connected with said picking lever, toggle joint means connected with said picking lever for holding said lever in picking position against the action of the power accumulated in said accumulating means, drive means including a cam having a first surface portion, said toggle joint means including a lever, a cam follower on said last mentioned lever and engaging said first surface portion, said last mentioned lever including a second cam surface portion, a cam follower supported by said cam and engaging said second surface portion, and a brake piston connected with said last mentioned lever.

2. A shuttle picking mechanism for a weaving machine comprising a shuttle picking lever, power accumulating means connected with said picking lever, actuating means, a toggle joint mechanism connected with said picking lever for temporarily holding said picking lever in picking position against the action of the power accumulated in said accumulating means, and follower means forming part of said toggle joint mechanism and being adapted to be temporarily engaged by said actuating means for actuation of said toggle joint mechanism for releasing said picking lever and surrendering the latter to the action of said power accumulating means, said actuating means including a cam having a surface portion, said follower means including a cam follower roller adapted to be engaged by said surface portion, said actuating means including a follower roller mounted on said cam, said follower means including a surface portion adapted to be engaged by said follower roller which is mounted on said cam.

3. A shuttle picking mechanism for a weaving machine comprising a shuttle picking lever, power accumulating means connected with said picking lever, operating means connected with said picking lever for moving the latter againstthe action of said power accumulator for loading the latter, said operating means including actuating means and a toggle joint mechanism interposed between said actuating means and said picking lever for moving into and temporarily holding said picking lever in the picking position against the action of said power accumulating means, said actuating means including a member temporarily engaging said toggle joint mechanism for collapsing the latter and surrendering said picking lever to the action of said power accumulating means.

4-. A shuttle picking mechanism as defined in claim 3 comprising a casing, said picking lever being outside of said casing, a shaft having an end portion projecting from said casing and being connected with said picking lever for actuating the latter, an arm connected with said shaft inside of said casing and extending at an angle from said shaft, said toggle joint mechanism being placed inside of said casing and including a lever swingable on a stationary pin and a link pivoted to said last mentioned lever and pivotally connected with said arm.

5. A shuttle picking mechanism according to claim 4 in which said shaft is hollow and said power accumulating means includes a torsion rod placed inside of said shaft and having one end fixed to a stationary part of the weaving machine and the other end fixed to said shaft.

References Cited in the file of this patent UNITED STATES PATENTS 332,400 Kesselring Dec. 15, 1885 1,175,772 Kelley Mar. 14, 1916 2,160,338 Moessinger May 30, 1939 2,160,339 Moessinger .2 May 30, 1939 2,564,383 Trautvetter Aug. 14, 1951 2,615,474 Ibanez Oct. 28, 1952 2,715,422 Pfarrwaller Aug. 16, 1955 2,777,472 Pfarrwaller Jan. 15, 1957 FOREIGN PATENTS 678,468 Germany July 16, 1939