Abstract: A pick device is incorporated in a weaving machine for the shuttles. The device comprises an accumulator for a working medium which can be filled into and emptied out of the accumulator and a pick-executing unit is incorporated, which performs its pick operation upon actuation by the working medium during emptying of the working medium out of the accumulator. A regulating member varies the effect of the working medium on the unit as a function of signals received for a controlling unit, thereby providing a predetermined pick force to the pick-executing unit.

Abstract: A pneumatic picking mechanism for weaving shuttles wherein the weaving shuttle is driven by a piston moved in a cylinder cavity by pressurized gas and wherein the pressurized gas is supplied from a reservoir through a main valve to the cylinder cavity and the main valve is controlled via a control valve assisted by an auxiliary valve.

Abstract: Facilities for temporarily holding a rear portion of a fluid-actuated piston rod coupled to a gripper shuttle in a weaving loom are described. Pressurized fluid is cyclically introduced into a chamber that communicates at its rear end with an elastomeric reservoir and at its front end with the rear portion of a cylinder in which the piston rod moves, with a rear collar on the piston rod projecting into the chamber when the piston is in its rearmost launch position. A pivotally mounted fork is mounted in the chamber for normally engaging and immobilizing the collar on the piston rod. Prior to the initiation of launch, the fork is moved via a lever and pitman assembly from such locking position to a forward release position in which the piston rod may be propelled forwardly by pressurized fluid accumulated in the elastomeric reservoir.

Abstract: Improvement in pneumatic shuttle picking mechanism for looms which include a picking cylinder and a pump cylinder; a first piston slidably mounted within the picking cylinder and having attached thereto a piston rod which extends through the outlet end of the picking cylinder for picking engagement with the shuttle; a second piston slidably mounted within the pump cylinder and having attached thereto a piston rod which extends out of the inlet end of the pump cylinder for attachment to drive mechanism for reciprocating the second piston; conduits connecting the outlet side of the pump cylinder to the inlet side of the picking cylinder and the outlet side of the picking cylinder to the inlet side of the pump cylinder in a closed system; and a one-way valve located at one end of the pump cylinder which only allows air to enter the pump cylinder from the atmosphere and only when the pressure within the pump cylinder falls below atmospheric pressure.

Abstract: Facilities for controllingly reciprocating a hydraulically-actuated piston coupled to a gripper shuttle are described. A first hydraulic fluid reservoir and the cylinder housing the shuttle-engaging piston are disposed in a unitary, substantially closed housing pivotally supported on a rotatable shaft of the loom. Piston-actuating fluid is cyclically introduced rearwardly of the piston into an elastomeric reservoir disposed behind and coupled to a perforated rear wall of the cylinder. Fluid from the first reservoir in the housing is periodically transferred into the second reservoir to launch the shuttle. To effect the return stroke of the piston, fluid from the first reservoir is transferred to the front end of the cylinder in timed relation to the fluid transfer to the second reservoir.