A helicoidal blade system is presented having an armature to facilitate bending of metal stock to form helicoidal blades. In one or more embodiments, the armature has an exterior surface that is generally conical in shape and includes a guide structure and an engagement track. The helicoidal blade system also includes drive coupler and motor that are operably coupled together. The drive coupler is configured to engage the engagement track of the conical armature and rotate the conical armature when the motor is operated. A blade metal feed apparatus is configured to feed the metal stock into the helical shaped guide structure as the conical armature is rotated. As the conical armature is rotated, the metal stock is bent around the armature within the helical shaped guide structure to form one or more helicoidal blades.

The object of the application is an apparatus (1) for manufacturing of spiral tubes (2) having at least two layers, comprising at least two feeding units (4, 4) for feeding a material strand (10, 10), at least one glue unit (5) for feeding the glue onto the material strand (10, 10), a forming unit (6) comprising a forming rod (13) and a forming strip (14) winding around a formed fragment of a continuous spiral tube (3), and a cutting head (7) for cutting off an individual tube (2) from the continuous spiral tube (3). The apparatus is characterised in that between the forming rod (13) and the cutting head (7) there is situated a cutting unit (8) for cutting the formed or partially formed continuous spiral tube (3) or a scrap section (3A) of the tube. The object of the application is also a method for manufacturing of spiral tubes (2) having at least two layers, in the apparatus (1).

A vegetable knife includes a pulverizing coring pin for pulverizing a core of a vegetable, where the pulverizing coring pin can be a generally cylindrical tube. The pulverizing coring pin can define one or more pulverizing tubes that extend from a first end of the pulverizing coring pin to a second end of the pulverizing coring pin opposite the first end. The vegetable knife also includes at least one vegetable shaping blade that extends radially outwardly from the pulverizing coring pin, where the at least one vegetable shaping blade supports the pulverizing coring pin at a location generally central with respect to the vegetable knife. The vegetable knife may also include an outer flange for coupling the vegetable knife to a rotatable cutting assembly. The vegetable shaping blade can be connected between the outer flange and the pulverizing coring pin for supporting the pulverizing coring pin.

A method where a propeller is set into locomotion relative to a medium at least partially surrounding the propeller. An actuator induces a rotation of the propeller relative to the medium and about a rotational axis of the propeller, and the propeller converts its rotational movement into locomotion relative to the medium. The aspect ratio of at least one cross-section of the propeller is three or more. Also a helical or modifiedly helical propeller for converting rotational movement of the propeller into locomotion of the propeller relative to a medium at least partially surrounding the propeller, where the aspect ratio of at least one cross section of the propeller is three or more. And a method of producing a propeller, including the step of providing a plate extending along the helical axis, where the aspect ratio of at least one cross section of the plate is three or more.

A flow-propelled rotary knife system includes a housing, having an outlet end and walls defining a fluid passage, a rotatable blade holder, disposed at the outlet end and having a central aperture substantially aligned with the fluid passage, and at least one blade, extending diametrically across the central aperture of the blade holder. The blade holder is configured to rotate about a rotational axis passing through the central aperture, and the at least one blade has a twisted shape selected to rotationally propel the blade and the blade holder to rotate about the rotational axis when the blade is contacted by fluid flowing through the fluid passage and the central aperture in a flow direction, whereby objects propelled along the fluid flow path in the flow direction toward the outlet are helically cut by the rotating blade.

Size-reduction units, size-reduction machines, and methods capable of producing size-reduced products from a variety of solid and semisolid materials. A size-reduction unit includes a circular cutter adapted and arranged to cut a product into strips, a rotating cross-cutter adapted and arranged to receive the strips from the circular cutter, and a stripper plate. The cross-cutter has knives with cutting edges that are adapted and arranged to cut the strips into a size-reduced product, and the stripper plate defines a shear edge in proximity to the cutting edge of each knife of the cross-cutter as its cutting edge encounter the shear edge during rotation of the cross-cutter. The cross-cutter has a helical fluted shape comprising flutes between adjacent pairs of the knives.

A method where a propeller is set into locomotion relative to a medium at least partially surrounding the propeller. An actuator induces a rotation of the propeller relative to the medium and about a rotational axis of the propeller, and the propeller converts its rotational movement into locomotion relative to the medium. The aspect ratio of at least one cross-section of the propeller is three or more. Also a helical or modifiedly helical propeller for converting rotational movement of the propeller into locomotion of the propeller relative to a medium at least partially surrounding the propeller, where the aspect ratio of at least one cross section of the propeller is three or more. And a method of producing a propeller, including the step of providing a plate extending along the helical axis, where the aspect ratio of at least one cross section of the plate is three or more.

There is described a device with quick change blades for the transverse cutting or perforation, for the whole of the width and progressively, of continuous and moving webs of paper, plastic or other materials, also with different thicknesses, wherein the fixed blade assembly and the rotary blade assembly are installed on the side members of a main base frame, with the drive means and with the means for adjusting the parallelism and the degree of interference between said two blades, said main base frame being installed removably on a secondary base frame, with means for adjusting the transverse alignment of the same main frame with the blade assemblies with respect to the longitudinal axis of the web to be cut, to allow dynamic execution on this web of a cut perpendicular to the longitudinal sides of the same web, this device being provided with means that allow quick installation and, when necessary, replacement with a new device each time both said blades require in-depth maintenance and adjustments, all for the purpose of limiting the downtimes of the packaging machine during replacement of the same device.

A rotary knife fixture for cutting vegetable products such as raw potatoes into spiral shapes. The knife fixture includes a ring-shaped blade holder driven rotatably within a hydraulic product flow path. The blade holder includes at least one cutting blade, wherein the blade is twisted from a generally longitudinally aligned center axis outwardly in opposite circumferential directions with a sharpened leading edge set at a desired pitch angle. By controlling the pitch angle of the blade in relation to the blade rotational speed and velocity at which the potato travels along the hydraulic flow path, the resultant spiral cut shape is selected. By using multiple cutting blades at known axially spaced positions and selecting the angular position of each cutting blade in succession, the number of spiral shapes cut from each potato is selected. The blades can have a nontextured straight-cut edge, or a textured crinkle-cut edge, or a combination.

The device includes a fixed counter-blade and a rotating blade-holder on which a set of rotating blades is arranged. A web material which must be perforated or cut into sheets passes between blade-holder and counter-blade. A mutual contact sensor and an angular position sensor provide signals that allow correct positioning and functioning of the rotating blades and the counter-blade to be displayed on a human-machine interface.