US2736340A - Devices for braking and propelling the shuttle in mechanical looms - Google Patents

Description

Feb. 28, 1956 P. c. SELLES 2,736,340

DEVICES FOR BRAKING AND PROPELLING THE SHUTTLE IN MECHANICAL LOOMS Filed Jan. 9, 1953 2 Sheets-Sheet 1 INVENTOR. F: OR!) ERDANS SELL-ES Feb. 28, 1956 P. c. SELLES DEVICES FOR BRAKING AND PROPELLING THE SHUTTLE IN MECHANICAL LOOMS 2 Sheets-Sheet Filed Jan. 9, 1953 INVENTOR. VEDR CERDAP/S ELLES United States Patent 9 DEVICES FOR BRAKING AND PROPELLING THE SHUTTLE IN MECHANICAL LOOMS Pedro Cerdans Sells, Barcelona, Spain Application January 9, 1953, Serial No. 330,388

Claimspriority, application Spain January 11, 1952 4 Claims. (Cl. 139-185) This invention relates to improvements in the devices for braking and propelling the shuttle in mechanical looms.

It is an object of the invention to provide braking by pneumatic means in conjunction with means for applying a progressive frictional braking force, the picker of the shuttle being free from the sword and mounted on a guided carriage of definite and fixed positions, the whole concerning very important facts in connection with the working of the shuttle, the yield of the loom and a guarantee of certainty in stopping.

It is a further object of the invention to provide the fitting of a receiver or movable stop-butt into the shuttlebox, which, being suitably guided, acts on two cylinders of pneumatic braking, whilst the said stop-butt comes against a belt or sloping piece of leather, producing progressive friction; the picker being, on the other hand, independent of the sword and mounted on the carriage that, in its course, reaches four different fixed positions, one being its extreme rear position, one which it reaches on its return so that the picker may come into contact with the point of the shuttle, another at the point of expulsion and the other at the full braking point and, finally, at the beginning of its cycle again when the shuttle returns. The improvements in this invention further offer the necessary certainty of automatic stoppage should the shuttle not arrive at the correct moment.

With the foregoing and other objects in view, the present invention consists in certain improvements in the devices for braking and propelling the shuttle in mechanical looms, which comprises an adjustable pneumatic brake in co-operation with a progressive friction belt against which there press some retaining levers and on which the lever assuring the entrance of the shuttle acts, the latter remaining in a fixed position for the return run, in which position the change of spool is made and the picker stays in contact with the point of the shuttle to check the expulsion of the latter with a minimum of shock.

In order that the invention may be more readily understood, reference is made to the accompanying drawings,

which illustrate diagrammatically and by way of example one embodiment thereof, and in which:

Fig. 1 is an elevation of the braking device;

Fig. 2 is a plan View of the upper side of the same device;

Fig. 3 is a detail of the safety lever;

Fig. 4 is a detail of the retention lever; and 1 Fig. 5 is a scheme of the cycle through which th picker and sword run.

The arrangement in this invention contains the movable stop-butt 1 set into the framework of the loom and mounted on the sliding carriage 2, which is integral with the two cylinders 3 which also slide in said direction on either side of the shuttle-box and on the fixed pistons 4, bringing about between the former and the latter a pneumatic braking action by means of the enclosed air acting on the cylinder walls. The said fixed pistons 4 are pierced along their length by the conduit 5 that communicates through 6 with a source of air-pressure in order to bring 2,736,340 Fatented Feb. 28, 1956 c ICC the cylinders 3 and carriage 2 back into position. The two piston pieces 4, although their position is fixed, may have their position adjusted by means of the screw 7 which, acting on the arm 8 of the piece that joins the two pistons so as to enable the chamber or space between the two pistons and the cylinders 3 to be enlarged or diminished.

The elongated friction member 10 co-operates in the braking of the shuttle 9 by engaging carriage 2, it being tightly stretched from the fixed end 11, where it is fastened by the screws 12, to the end portion 13 of the oscillating lever 14. This lever- 14 oscillates about the pivot 15, its

position may be regulated by means of the screw 16, and it is held in position by the spring 17.

Against this belt or friction member 10 act the levers or rods 18 which are operatively connected to the batten to hold the belt firmly in place when the batten begins to come forward, this increasing the force of the brake as long as the movement of the batten lasts, the pressure ceasing when the batten stops.

The lever 19 assures the entrance of the shuttle by bringing the stopping device into play when that part does not begin to move away at the right moment. It also brings into action a safety device that will stop the forward movement of the batten when the above-mentioned case arises. The spring 20 constantly presses on the lever 19 to maintain and assure its proper operation.

The picker 21 is independent of the sword 22 and is set on the sliding carriage 23 on the guides 24, the said carriage being operated by the end 25 of the sword 22.

The movements of the carriage within the shuttle-box in connection with those of the sword are shown schematically in Fig. 5, in which the trajectory ab represents the path of the carriage 23 with an overrun; bc represents the run covered to obtain the exact position of the shuttle in which the picker must come into contact with it, if a change of spool or pulsation of woof is to be carried out; cd represents the expulsion of the shuttle; and de represents the braking.

I claim:

1. In a mechanical loom including a shuttle, a shuttle braking device, comprising in combination, a stop adapted to engage the shuttle; a carriage supporting said stop; a pair of parallel cylindrical members closed at one end and adapted to extend in the direction of shuttle movement;

a pair of elongated piston members having a pair of ends projecting into said cylindrical members so that movement of said stop by the shuttle in one direction reduces the air spaces defined in said cylindrical members by said piston members, said piston members being formed with conduits opening at said pair of ends of said piston members into said air spaces and adapted to communicate with a source of pressurized air for moving said cylindrical members in an opposite direction; an elongated friction belt member extending in said one direction for engaging said carriage so as to brake movement of the same in said one direction; and an adjustable member having one end engaging said elongated friction member and being movable between a plurality of advanced positions for urging said friction member at variable pressure against said carriage.

2. A braking device as claimed in claim 1 and including at least one lever movable between an inoperative and an advanced operative position engaging said friction member and urging the same to engage said carriage for braking the shuttle, said lever being adapted to be operated by the batten of the loom to move between said inoperative position and said operative position in accordance with the batten movement.

3. A device as claimed in claim 2 and including a shuttle picker; guide means supporting said shuttle picker for reciprocal movement; a movable sword having a head 1x2 portion connected to said shuttle picker for moving the same, said shuttle picker being movable between four positions, namely, an end position into which said shuttle picker is adapted to be urged by the shuttle, a second. Position adapted to, hold the shuttle in a spool changing position, a third position for throwing the shuttle, accelerated during movement from said second to said, third position.

and a braking position for engaging the returned shuttle.

4. A device as claimed in claim 1 and including a shuttle picker; guide means supporting said shuttle picker for reciprocal movement; a movable sword having a head portion connected. tov said shuttle. picker for moving; the same, said shuttle picker eing movable between tour positions, narvnel y, an end position into whichsaid, shnttlg picker is adapted to be urged by the shuttle, a second 4 205M9 1 a pte hold h s l in a .190 1 hangin position, a third position for throwing the shuttle accelerated during movement. from said second to said third position, and a braking position for engaging the returned shuttle.

References Cited in the file of this patent UNITED STATES PATENTS 8 Bacl man Y V V M y 1909 1,315,608 Newton-Smith Sept. 9, 1919 2,105,578 Bahan Ian. 18, 1938 2,426,271 Kottemann Sept. 2, 1947 2,538,530 Kronofi Jan. 16', 1951

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