Erwin Pfarrwaller has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: The lubricant mist is supplied in timed fashion to at least one nozzle (31, 36, 40, 45) associated with a lubrication station in the zone of movement of a moving part (32, 37, 41 and 34 respectively). The timed supply of the mist is effected in dependence upon the position of a drive shaft from which the moving part derives its movement. The lubricant mist can therefore be supplied to the lubrication station in an accurately dosed quantity only when it is needed there. A possible use of the lubricating method is for looms where it is particularly important that the web of cloth produced on the loom should not be soiled by lubricant.
Abstract: The picking mechanism is provided with two torsion bars. One torsion bar is stressed in order to accelerate a gripper projectile of the loom. The second torsion bar, upon release of the first torsion bar, is temporarily connected to the first torsion bar so that energy can be stored by the second torsion bar via a double-arm lever. During a return motion of the acceleration lever to a picking position, the second torsion bar is relieved of tension by delivering the stored energy to the drive shaft of the picking mechanism via the double arm lever. The picking mechanism thus uses only little energy.
October 15, 1990
Date of Patent:
February 25, 1992
Sulzer Brothers Limited
Frantisek Jankovsky, Danilo Vezzu, Erwin Pfarrwaller, Hans Demuth
Abstract: A projectile accelerator has a coupling transmission articulated between a cam follower lever and a picking lever which has two end positions. The projectile accelerator also has an eccentric rocker on the drive shaft which cooperates with a tensioning lug on the accelerating shaft in order to carry out a return motion of the picking lever without need for a large angular movement of the cam follower lever. The picking lever is able to traverse large angles of movement while the cam following lever traverses reduced angles of movement.
Abstract: The torsion bar firing device is provided with a striking lever having an end piece at the distal end which acts directly on the abutment face of a projectile on firing. The striking face of the end piece of the striking lever and/or the abutment face of a projectile may be formed as inclined planes or as convex, concave, or concave-convex surfaces. The direct drive of the projectile by the striking lever reduces the masses to be accelerated and braked. This advantageously influences the energy consumption and the weaving efficiency of the projectile weaving loom. The end piece may be integral with the distal end of the striking lever or may be in the form of a rotatably mounted roller of a trapezium shaped element.
March 6, 1989
Date of Patent:
May 8, 1990
Sulzer Brothers Limited
Erwin Pfarrwaller, Danilo Vezzu, Oskar Hubner
Abstract: A picking mechanism for a loom including a projectile lift which points a projectile into a ready-to-pick position is made with a guide profile cross section open on the striking side. The projectile opener is provided with an additional guide element to guide the projectile body during movement into the ready-to-pick position. After positioning, the projectile opener with the guide element pivots away to expose a semi-circular space on the striking side of the projectile for the operation of a picking mechanism. The opener guide element may engage with an outer surface of the projectile during pivoting or may be positioned coaxially of a gripper opener to engage an internal surface in an additional passage in the projectile.
Abstract: The plastic projectile with an associated projectile opener has a projectile clip having arcuate parts. The projectile opener exerts forces both transversely and lengthwise of the picking direction on the arcuate parts of the clip for simultaneous opening and positioning relative to these two directions. A through aperture in the plastic casing is not touched by the projectile opener. The problem of wear in connection with conventional positioning on the plastic casing therefor disappears. A projectile made of abrasion-resistant impact-resistant plastic facilitates oil-free operation and ensures very high cloth quality.
Abstract: The projectile housing is made with thin-wall section at least in the central third of the housing. In addition, internal projections are provided on the housing walls in order to support the thin-wall section of the housing on the clamping arms of the weft thread clamp. In one embodiment, the thin-wall section may be formed by a sleeve which is joined in opposite ends to the remainder of the projectile housing. Alternatively, the sleeve may extend to the rear end of the housing while being supported on enlarged jaws located on the ends of the clamping yarns.
Abstract: The projectile guide comprises guide teeth whose exit aperture for the weft yarn is subject to the following conditions in relation to the projectile:x=b; x=l; y=d;where x denotes the horizontal distance between the vertical centerline of the projectile and the end of the guide hook of a guide tooth; b denotes half the width of the projectile; l denotes the horizontal distance between the center M of the projectile and the free end of the support; y denotes the vertical distance between the free end of the support and the horizontal inside edge of the hook; and d denotes the vertical distance between the horizontal inside edge of the hook and the horizontal centerline of the projectile.
Abstract: The tensioning beam assembly has a tensioning beam and/or support beam mounted in step bearings located across the width of the weaving machine. Sagging of the tensioning element is eliminated and reduced diameter tensioning elements and support beams can be used.The tensioning element may be formed as a solid shaft which is rotatably mounted in individual step bearings on the support beam or fixedly mounted by connecting pieces to the support beam. In one embodiment, the tensioning element is in the form of a plate which is secured directly to the support beam and which has a curved outer end over which the warp threads pass. In still another embodiment, the tensioning element is in the form of a U-shaped plastic strip which is mounted about a projection extending along the support beam.
Abstract: At a fabric take-off apparatus the deflection rod arranged forwardly of the cloth take-off roll, is provided at both halves thereof with opposite pitch threaded grooves and, if desired, at the ends thereof with spreader-needle rolls. The fabric, directly after travelling on to the take-off roll, is stretched in its width. Upon departing from the take-off roll the fabric or cloth, at the region where it leaves the take-off roll and arrives at a deflection roll, therefore does not tend to become wider due to the appreciably lower tension of the cloth beam. In this way the formation of creases or folds in the fabric cloth is avoided, which otherwise could be permanently formed at the contact location or nip between the cloth take-off roll and the subsequently arranged deflection beam or roll.
Abstract: The fabric take-off device comprises a fabric take-off roller mounted to be movable transversely of its longitudinal axis and two associated rod-shaped fabric guide elements which are mounted on fixed axes for supplying the fabric to the take-off roller and for taking the fabric away from the roller. The fabric tension causes the take-off roller to be pressed against the two guide elements due to the movable mounting of the roller. This contact-pressure force increases automatically as the cloth tension increases. A very reliable fabric take-off is obtained without slipping of the fabric on the take-off roller. To avoid damage to the fabric, the take-off roller need not have a rough surface nor need any pins, but may have a relatively smooth surface made, for example, of plastics.
Abstract: The drive mechanism for a reciprocating sub-mechanism on a weaving machine, e.g. for a cam for raising a projectile into the picking line, comprises a dead-center type crank drive. The drive is pivoted to and fro continually through 180.degree.. The connecting rod, which drives the projectile raise cam, is kept practically completely in the standstill position in the two crank standstill positions. This rod is mounted on an eccentric section of the crank pin so that small reciprocating movements of the crank in the dead-center positions due to play in the parts driving them cannot be transmitted to the connecting rod and projectile raise cam. The eccentric section of the crank pin can also be adjusted.
Abstract: A cam drive is used to control the picking movement of the picking lever. The cam drive includes a dam disc which has a recess (or projection) which causes the lever to accelerate at the beginning of a pick and thereafter imparts a prestress to the spring before the cam follower of the lever moves out of the cam disc recess. A dog clutch is used to permit movement of the cam disc relative to the uniformly rotating drive shaft.
Abstract: A method of operating a catcher mechanism in a gripper projectile weaving machine and a catcher mechanism for performing the method are disclosed. The projectile ejection portion of the catcher mechanism is operated by opening the projectile yarn clip, ejecting the projectile from the picking path, closing the yarn clip and moving the members of the ejection mechanism out of the picking path by pivoting the members sufficiently to permit immediate entry of a following projectile prior to returning the ejection mechanism to the initial position.
Abstract: A catcher mechanism for the weft picking means of a weaving machine which facilitates higher machine speed. Included in the catcher mechanism is a picking means brake, a sensing element movable into the path of the picking means, and a push-back member for pushing the picking means away from its stop position and into a yarn release position. The sensing element has the end thereof adjacent the picking means in engagement with a spring member so that the sensing element is movable along with the push-back member in the push-back direction, such movement being against the force of the spring.
Abstract: The pulse transmitter is synchronized with the weaving cycle of the machine drive and carries at least one sensing surface of variable shape. A detector is secured to the tension beam and is responsive to changes in warp tension. The detector carries a sensing element in the form of a proximity switch which is disposed over the sensing surface of the pulse transmitter. Depending upon the position of the proximity switch relative to the sensing surface, a pulse is emitted to the warp beam drive for stepping of the warp beam as the pulse transmitter rotates past the sensing element. This pulse is variable in the time-of-occurrence as well as in duration.
Abstract: The coupling has at least one coupling part secured to the heddle frame with a toothed driving element extending from the beam into an opening in the drive lifter to engage with a second toothed coupling part. Each coupling part within a drive lifter is spaced from a wall of the drive lifter to define a passage to receive a driving element.
Abstract: The eccentric mechanism includes deflecting levers which are rotatably mounted on a fixed spindle and which bear against bearing elements in order to preclude an accumulation of tilting forces along the line of the levers. Each bearing element has a disc-shaped portion located between two levers and cooperates with a bushing, separate or integral, or a shaft portion to mount a lever.
Abstract: The cut-off device is used to cut the selvage of a woven fabric and includes a movable member which is driven by means of a pivotally mounted lever and a flat disc. The disc is carried on a pivotal drive element which is reciprocated off a drive shaft of the machine. The drive shaft disc and lever are located below the fabric plane so as to be moved out of the way should the need arise to repair a broken weft thread.
Abstract: The eccentric drive for lifting the heddle frame uses a mounting arrangement by which cam rollers can be detachably mounted on a cam-follower lever. The mounting arrangement uses a roller journal which is secured by bolts to the lever and which serves as a mount for a roller. The diameter of the journal surface on which the roller rotates is relatively large to provide a low surface pressure of the roller on the journal.