Abstract: In order to hold at a minimum the noise emission of the winding gear in a winding unit of a spinning machine for the processing of endless filaments, the winding unit is provided with a noise protection door which is pivotingly translatable from an initial or idle position at the side of the winding unit into an operating position in front of the winding unit. The noise protection door comprises a guide portion which is supported or guided by means of rolls and guide pins and a noise protection portion pivotally supported on the guide portion by means of pivot pins. The guide pins forming part of the guide portion and the guide pins forming part of the noise protection portion project into two guide grooves arranged in mirror-image fashion, one of which is provided in a floor plate and the other in a cover of the winding unit. Thus the guide portion is guided in a straight line and the noise protection portion is pivotally guided.

Abstract: An acoustical shield assembly and mating thread preguide unit include a series of acoustically insulated panels that substantially surround a sewing machine so as to be operative in attenuating any generated noise. A portion of the top panel, including a downwardly extending flange, is hinged to move between an opened position allowing access to the sewing machine and a closed position for mating with the preguide unit. The preguide unit is mounted to the sewing machine by a pair of adjustable mounting rods and includes two face plates spaced apart by means of a pair of spacer posts. Each face plate includes eyelets between the spacer posts for the passage of thread to the sewing machine. When the hinged portion of the top panel is closed, an elongated opening is formed between the downwardly extending flange and the top edge of the adjacent rear side panel of the shield assembly.

Abstract: A noise damping guard for a circular saw blade of the type mounted for axial rotation relative to a material support plane disposed transverse to the cutting axis of the blade. The guard comprises a stationary lower guard section secured beneath the support plane and a pivoted upper guard section secured above the support plane. Each guard section comprises a guard frame supporting an inner pair of anti-friction metal plates secured in parallel-spaced relationship to one another to receive a saw blade therebetween and define an air gap between each side of the blade and an inner face of the metal plates. A spacer plate and a backing plate is secured to an outer face of each of the metal plates to prevent the vibration of the inner anti-friction metal plate and to provide an additional noise barrier and still further to maintain the metal plates in alignment. A pivoting support arm is secured to the guard upper section for upward displacement of the guard upper section.

Abstract: An acoustic enclosure is provided having top, bottom, front, side and back panels formed to receive and enclose the face plate and chute of a crowner machine. Acoustically absorbant and cleanable material is disposed on the interior surfaces of the side portions to absorb sound produced at the crowner face plate and chute, and the edges of the enclosure abutting the crowner machine include a material for creating a seal therebetween to further reduce the sound level in the immediate area.

Abstract: A flexible sound-absorbent blower cover includes an outer skin of a pliable material shaped to surround the blower and conforming generally to the shape of the blower but oversize to provide a space between the outer skin and the blower. A flexible porous sound-absorbent liner is disposed in the space and is bonded to the outer skin. The blower draws air in through the liner which filters the air. The structure of the flexible one piece cover prevents it from resonating. The cover is provided with a slit which can be opened to facilitate installation and then closed to keep the cover in place on the blower.

Abstract: A machine tool for machining workpieces formed of wood, synthetic plastic materials and the like is disclosed, including a transport device mounted on a frame for transporting the workpiece relative to at least one laterally arranged workpiece, and a sound damping cover unit arranged laterally of the tool for partially surrounding the round radiating region of the tool or the workpiece, characterized in that the sound damping cover unit includes a plurality of pivotally connected sound damping members that are displaceable between retracted position and extended positions above and/or below the plane of movement of the workpiece. One end of the damping cover unit is connected with a supporting frame that contains a receiving space for receiving the damping cover unit when in the retracted position.

Abstract: Noise output of a rotary cutting tool such as a circular saw blade is substantially reduced by means of a guard which wholly encloses the blade when the blade is not cutting and which comprises fixed and movable imperforate guard members, the movable guard member being movable to expose only the cutting segment of the blade. Inner surfaces of the flat side walls of the guard have sound absorbing means such as a Helmholtz resonator array or a layer of acoustical foam. Modifications of the guard to optimize its silencing effectiveness are disclosed.

Abstract: A wire printer printing head comprises a support member, a plurality of printing elements having a print wire with a flap-armature electromagnet and a sound absorbing cover. The printing element are radially and slidably mounted to the support member and adjustable to a mounting position of each printing element with respect to the support member by an eccentric pin. The sound absorbing cover composed of a core plate and sound absorbing material is secured to the support member and surrounds all printing elements.

Abstract: A piling rig comprises two sound-reducing enclosures arranged one over the other. In use the bottom enclosure is arranged around a row of piling and the top enclosure surrounds the piling hammer as it moves along the row of piling for pile-driving or pile-extraction purposes.

Abstract: A shield for an assembly includes a member of generally corrugated construction, which is uniquely configured to substantially prevent the passage of liquid contaminants impinging thereon. The invention is especially concerned with the provision of an acoustical assembly employing such a shield.

Abstract: A cover for suppressing sound from a machine includes a pair of cover members having sound suppressing material thereon and connected to and supported by a pair of oppositely-disposed brackets mounted on the base of the machine. The cover members may be positioned in a horizontal plane in a closed position at least partially over the machine, and at least one of the cover members is pivotally connected to the brackets to move to an upstanding disposition in an open position. Stop members limit the movement of the pivotally mounted cover member between its open position and its closed position.

Abstract: The cover for a weaving machine is formed, in part, of flexible mats of sound-insulating material which can be raised or lowered in the manner of a window shade.In one embodiment, the rollers on which the flexible mats are mounted are positively driven to raise or lower the mats while a toggle means is used to support the mat over the machine frame. In addition, the rollers are mounted in a carriage which can be moved to one side while the sides of the cover are opened to allow access to the machine from above.In another embodiment, the flexible mats are in an accordion or pleated form and are raised or lowered via an endless chain.

Abstract: The lower portions of the guard rings of a row of rotary fiberizing units are surrounded by an elongate rectangular noise suppressor having front and rear panels extending lengthwise of the row and transverse end panels connecting the front and rear panels. The panels have impervious sheet steel at their outer surfaces, but are provided with screens of expanded steel at their inner surfaces and are filled with a sound deadening material. Between each pair of adjacent fiberizing units a panel-like expanded steel basket full of sound deadening material is suspended immediately below the guard rings and connected to the front and rear panels. The front panel is segmented into removable doors enabling the fiberizer units to be moved out of the noise suppressor for inspection or repair.

Abstract: An elongated non metallic cylindrical tubular member is provided and adapted to be received in the feed tube of a bar feeding machine. The cylindrical member is provided with an inside diameter sufficient to receive bar stock therethrough and functions to cushion the impact of the bar against the feed tube thereby reducing the sound levels produced by the machine. The tubular member includes at least one end extending outwardly from one end of the feed tube and means mounted to the end of the tubular member to retain it in place.