A rotary hair-cutting unit including an internal cutting member having cutting elements with cutting edges, and an external cutting member having hair-guiding elements with counter-cutting edges). The co-operating edges define a shearing angle, such that during rotation a cutting edge first meets a counter-cutting edge at a radial initial-passing position. In a cross-section at said radial initial-passing position one of the internal cutting member and the external cutting member is provided with a particular abutment geometry. The inclusion of an abutment geometry will be effective to push the depressed hair-guiding element and the rotating cutting element axially away from one another, such that the cutting element will pass the hair-guiding element without being blocked and without causing substantial collision damage.

A method of manufacturing a guard element is configured to be used in a hair-cutting unit and which is of a design including a shaving track with hair-entry apertures where the shaving track has a thickness profile with at least one thickness value. According to the manufacturing method, a sheet is proviced, and the thickness profile of the shaving track according to the design of the guard element is realized in the sheet at a position where the shaving track is to be formed. Subsequently, material is removed from the sheet at the position where the shaving track is to be formed so as to create the hair-entry apertures.

A shaving unit for a shaving apparatus including a cutting unit, a main input spindle coupled to each cutting unit to drive an internal cutting member, and a system for adjusting operational parameters of the shaving unit. The adjustment system includes an adjustment input drive member drivable by the spindle, a unidirectional coupling member for coupling the spindle and the adjustment input drive member, when rotating in a first direction, such that the adjustment input drive member is driven by the spindle. A decoupled condition of the spindle and the adjustment input drive member is also provided when the spindle rotates in a second direction, such that the spindle is prevented from driving the member.

A shaving appliance and a shaving unit are described. The shaving unit has a rotary cutter having a plurality of cutter blades that are provided with a cutting edge. The shaving track includes hair-entry slots that, seen in the direction of movement, have a frontal edge and a rear edge. A slot angle (α) defined as an angle of inclination between the frontal edges (48, 148) of the hair-entry slots. A shearing angle (δ), defined as a difference between the slot angle (α) and an angle of inclination (β) of cutting edges of cutter blades with respect to the radial direction. The shearing angle (δ) is defined at an actual point where the frontal edges and the cutting edges cooperate.

A hair guide including a support member detachably couplable to a hair cutting apparatus, and at least two annular hair guiding members each having a central axis and hair guiding elements extending radially relative to the central axis and arranged in an annular hair guiding zone. At least one hair guiding element has an inwardly directed rounded end portion arranged at a distance from the central axis such that, when the support member is coupled to the hair cutting apparatus, the rounded end portion is positioned, in a radial direction relative to the central axis, at least partially inwardly of an inner side wall of an annular cutting zone of an associated cutting unit of the hair cutting apparatus and, in an axial direction relative to the central axis, at a distance from an annular recessed area of a central wall portion of the associated cutting unit.

A rotary hair-cutting unit comprises an internal cutting member (7) having cutting elements (10) with cutting edges (11), and an external cutting member (6) having hair-guiding elements (16) with counter-cutting edges (17). The co-operating edges are enclosing a shearing angle, so that during rotation a cutting edge first meets a counter-cutting edge at a radial initial-passing position. In a cross-section at said radial initial-passing position and taken perpendicularly to the radial direction, only one of the internal cutting member and the external cutting member is provided with a particular abutment geometry. Even in cases where a hair-guiding element is deeply depressed towards a rotating cutting element, the abutment geometry will be effective to push the depressed hair-guiding element and the rotating cutting element axially away from one another, so that the cutting element will pass the hair-guiding element without being blocked and without causing substantial collision damage.

The present disclosure relates to a shaving appliance (10) and to a shaving unit (24), the shaving unit (24) comprising a rotary cutter (30, 130) comprising a plurality of cutter blades (62, 162) that are provided with a cutting edge (64, 164), the rotary cutter (30, 130) being arranged to rotate about a rotation axis (26, 126) in a direction of movement (36, 136); a guard cap (28, 128) having an annular shaving track (44, 144) surrounding the rotation axis (26, 126) for cooperation with the cutter blades (62, 162), the shaving track (44, 144) being provided with hair-entry slots (46, 146) that, seen in the direction of movement (36, 136), have a frontal edge (48, 148) and a rear edge (50, 150); wherein the frontal edges (48, 148) of the hair-entry slots (46, 146) are, in a cutting portion (70, 170) along the long side extension of the hair-entry slots (46, 146), inclined with respect to a radial direction (96, 196) extending from the rotation axis (26, 126), wherein a slot angle (a) defined as an angle of inclination between the frontal edges (48, 148) of the hair-entry slots (46, 146) and the radial direction (96, 196) is in a range from 35° to 60°; wherein a shearing angle (δ), defined as a difference between the slot angle (a) and an angle of inclination (β) of the cutting edges (64, 164) of the cutter blades (62, 162) with respect to the radial direction (96, 196), is in a range from +20° to −20°; and wherein the shearing angle (δ) is defined at an actual point where the frontal edges (48, 148) and the cutting edges (64, 164) cooperate.

A hair guide (200) configured to be detachably couplable to a hair cutting apparatus (100), said hair guide comprising a support member (202) configured to be detachably couplable to the hair cutting apparatus, and at least two annular hair guiding members (206, 208, 210) each having a central axis (y) and a plurality of hair guiding elements (212) having a main direction of extension in a radial direction relative to the central axis and arranged in an annular hair guiding zone extending about the central axis, wherein at least one of the hair guiding elements has an inwardly directed rounded end portion (220) which is arranged at a distance from the central axis such that, when the support member is coupled to the hair cutting apparatus, the rounded end portion is positioned, in a radial direction relative to the central axis, at least partially inwardly of an inner side wall of an annular cutting zone of an associated cutting unit of the hair cutting apparatus and, in an axial direction relative to the central axis, at a distance from an annular recessed area of a central wall portion of the associated cutting unit which is surrounded by the inner side wall.

The invention relates to an external cutting member (19) for use in a hair-cutting unit (13a, 13b, 13c) of a shaving device (1). An annular hair-cutting track (41) of the external cutting member has a central axis (43), a plurality of hair-entry openings (49), and hair-guiding elements (51) arranged between each pair of adjacent hair-entry openings. The hair-guiding elements each comprise an outer surface segment (55), an inner surface segment (57), a first side surface (59) bounding a first hair-entry opening (49a), a second side surface (61) bounding an adjacent second hair-entry opening (49b), a first cutting edge (63) at a location where the first side surface connects to the inner surface segment, and a second cutting edge (65) at a location where the second side surface connects to the inner surface segment. In a cross-section extending perpendicularly to a radial direction with respect to the central axis, each hair-guiding element has an imaginary middle axis (79) extending perpendicularly to the inner surface segment. The imaginary middle axis intersects the inner surface segment in a point of intersection (81) half-way between the first and second cutting edges, and divides a total cross-sectional area (A.sub.T) of the hair-guiding element into a first cross-sectional area portion (A.sub.1) including the first cutting edge and a second cross-sectional area portion (A.sub.2) including the second cutting edge, the total cross-sectional area being the sum of the first and second cross-sectional area portions. According to the invention, the first cross-sectional area portion of each hair-guiding element is equal to or smaller than 48% of the total cross-sectional area of the hair-guiding element. The invention further relates to a hair-cutting unit (13a, 13b, 13c) for use in a shaving device (1), comprising an external cutting member according to the invention and an internal cutting member (21) which is rotatable relative to the external cutting member about an axis of rotation (29), wherein the internal cutting member comprises first cutting edges (69) for co-operation with the first cutting edges of the external cutting member during rotation of the internal cutting member in a first rotational direction (R1), and second cutting edges (73) for co-operation with the second cutting edges of the external cutting member during rotation of the internal cutting member in a second rotational direction (R

An objective of the present invention is to provide a grille for a hair shaver. In the present invention, by the combination of V-shaped hair shaving slots (including hair shaving long slots and hair shaving short slots) formed on the support surfaces at preset intervals, while contacting with the skin by the support surfaces, the hair is distributed to the hair shaving long slots and the hair shaving short slots on two sides, so that the hair is easier to enter a hair shaving region without escaping against the support surfaces. Accordingly, without reducing the effective hair shaving area, it is convenient for long hair to enter a hair shaving part, and a larger effective hair shaving length is obtained; and meanwhile, an effective support is provided for the skin, and the skin is prevented from being scratched by a blade.