CN109984444B

CN109984444B - Automatic hair dressing equipment

Info

Publication number: CN109984444B
Application number: CN201811632045.5A
Authority: CN
Inventors: 尼古拉斯·洛谢; 沃兰迪·吉威勒
Original assignee: SEB SA
Current assignee: SEB SA
Priority date: 2017-12-29
Filing date: 2018-12-29
Publication date: 2023-08-22
Anticipated expiration: 2038-12-29
Also published as: EP3731692A1; FR3076190B1; CN210248818U; EP3731692B1; FR3076190A1; CN109984444A; WO2019129874A1

Abstract

The invention relates to a hair-cutting device (1) designed to be gripped and handled by hand and comprising a body (2), said body (2) carrying at least one motorized roller (3), said motorized roller (3) being rotatably mounted with respect to said body in such a way as to frictionally move a hair strand (C) to be cut with respect to said body (2), said hair-cutting device (1) being characterized in that said body (2) also carries guiding means (5) for guiding said hair strand (C), said guiding means (5) being arranged with respect to said motorized roller (3) in such a way as to keep said hair strand (C) against said motorized roller (3) along an angular contact sector (alpha) at least equal to 30 °.

Description

Automatic hair dressing equipment

Technical Field

The present invention relates to the general technical field of hairdressing or hair-dressing devices, preferably for household use, and more particularly to a portable electric hairdressing device for ensuring hair shaping, in particular hair straightening.

The present invention relates more particularly to a hair-cutting apparatus designed to be gripped and handled by hand and comprising a body carrying at least one motorized roller rotatably mounted with respect to the body for frictional movement of the tresses to be cut with respect to the body.

Background

Electric hair straighteners are well known. They are usually presented in the form of V-shaped pincers, usually "sugar pincers" (pince a secret) shaped, the jaws of which consist of heating plates. These known hair straighteners allow the user to apply a local pressure to the hair strand by means of the pincers, while heating the hair strand, which allows to straighten the hair strand.

These known devices have some drawbacks, even if they are generally satisfactory.

First, these known devices have purely manual features, such as forcing the user to move the hair straightener itself along a given hair strand to shape the hair strand over its entire length. Not only is this tedious and uncomfortable for the user, but it also affects the final forming result. In fact, the manner in which the device is used (manual pressure applied, gesture … …) will vary from user to user, and even from hair lock to hair lock for a given user.

Thus, these known devices do not allow to guarantee constant and repeatable results, except that they are impractical to use.

Disclosure of Invention

It is therefore an object of the present invention to overcome the various drawbacks listed above and to provide a new hair-cutting device which is particularly easy and quick to use, the design of which not only allows limiting the manual intervention of the user, but also allows hair-cutting locks over their entire length.

It is a further object of the present invention to provide a new hair-cutting apparatus whose design allows a particularly reliable automatic operation.

It is a further object of the present invention to provide a new hair-cutting apparatus which allows to obtain particularly effective hair straightening under comfortable use conditions.

It is a further object of the present invention to provide a new hair-cutting apparatus which is particularly simple and compact in construction.

It is a further object of the present invention to provide a new hair cutting apparatus which is particularly robust and reliable.

It is a further object of the present invention to provide a new hair-cutting apparatus which is ergonomically designed and particularly intuitive to use.

These objects are achieved by means of a hair-cutting apparatus designed to be gripped and handled by hand and comprising a body carrying at least one motorized roller rotatably mounted with respect to the body for frictionally moving a hair strand to be cut with respect to the body, characterized in that it further carries guiding means for guiding the hair strand, arranged with respect to the motorized roller to keep the hair strand against the motorized roller along an angular contact sector (secteur angulaire de contact) at least equal to 30 °.

Drawings

Other features and advantages of the invention will emerge and emerge in greater detail on reading the description which follows, with reference to the accompanying drawings, given purely by way of illustration and not by way of limitation, in which:

fig. 1 shows a hair-cutting apparatus according to a first embodiment of the invention in a perspective view, wherein the clamping device is in a clamped configuration, which hair-cutting apparatus in this case constitutes an automatic hair straightener.

Fig. 2 shows the device of fig. 1 in a first exploded schematic view.

Fig. 3 shows the apparatus of fig. 1 and 2 in a second exploded schematic view, wherein parts are omitted for clarity.

Fig. 4 shows a detail of the device of fig. 3 in a perspective view.

Fig. 5 shows the device of fig. 4 in a front view.

Fig. 6 shows the device of fig. 1 to 5 in a schematic cross-sectional view.

Fig. 7 is a partial top view, along a front section, of the apparatus of the preceding figures.

Fig. 8 shows the device of the preceding figures in a perspective view, with the clamping device in the introduction configuration.

Fig. 9 shows the device of fig. 8 in an exploded schematic view.

Fig. 10 shows in front view the implementation details of the device of fig. 8 and 9.

Fig. 11 shows the device of fig. 8 to 10 in a schematic cross-sectional view.

Fig. 12 is a partial top view of the apparatus of fig. 8-11, taken along an elevational cross-section.

Fig. 13 is a schematic view of the apparatus of fig. 8-12 in longitudinal section.

Fig. 14 shows a hair-cutting apparatus according to a second embodiment of the invention in a perspective schematic view, with its clamping device in a clamped configuration.

Fig. 15 shows the hair-cutting apparatus of fig. 14 in a perspective schematic view, with its clamping device in the introduction configuration.

Fig. 16 schematically shows the device according to the invention in use.

Detailed Description

The hair-cutting apparatus 1 according to the invention is designed to be gripped and handled by hand. It is therefore a portable manual device, preferably for use in the home range by users who have no technical skills in terms of haircutting or styling, that is to say in terms of hair shaping and in particular hair straightening. Preferably, and according to the various embodiments illustrated in the accompanying drawings, the hair-cutting device 1 forms a hair straightener which allows the user to straighten his hair, preferably by providing heat and pressure. Preferably and as illustrated, the device 1 forms an automatic hair straightener, that is to say the device 1 is designed to limit the active intervention of a user who does not have a specific technical gesture performed, for example gestures and operations that a hairdresser can perform to obtain similar results. The automatic feature of the device 1 allows in particular the device 1 itself to ensure the relative movement of the locks of hair to be cut and the device 1. Preferably, the device 1 is designed to be substantially fixed (with respect to the user's head) while simultaneously moving the hair tresses.

However, the invention is not limited to this particular embodiment and it is entirely conceivable, for example, that the hair-cutting device 1 forms a hair curler, a hair iron or any other hair-shaping device, whether automatic or not. However, for the sake of brevity, the following description will focus only on the hair-cutting apparatus 1 ensuring a hair-straightening function.

As shown, the device 1 according to the invention comprises at least one body 2, which body 2 itself advantageously comprises a housing, for example made of injection-molded plastic. The body 2 may be presented in the form of an integral part (as shown in fig. 1 to 13) or alternatively in the form of an assembly of parts movable relative to each other (variants of fig. 14 and 15). The device 1 advantageously comprises a handle 2A, which handle 2A is intended for manual gripping to manipulate the device 1. The handle 2A is advantageously formed by the rear portion 200 of the aforesaid housing and is elongated backwards, for example by itself, by means of a power cord (not shown), and forwards by means of an active portion 201, which active portion 201 is intended to receive the hair tress C to shape it (in this case straighten the hair tress).

As shown, the body 2 carries at least one motorized roller 3, which motorized roller 3 is rotatably mounted with respect to the body 2 to frictionally move the tresses of hair C to be cut with respect to the body 2. The motorized roller 3 advantageously has a substantially cylindrical shape of a circular quasi-curve. The motorized roller 3 is therefore designed to roll the tresses of hair C to be cut, for example, at a speed comprised between, for example, 1cm/s and 5cm/s, preferably equal to about 2cm/s, with respect to the main body 2. For this purpose, the motorized roller 3 is designed on the one hand to establish a mechanical driving connection with the tresses C (in this case by friction, that is to say by local and temporary attachment of the tresses C to the surface of the roller 3), and on the other hand to the motor 4 so as to rotate by the motor 4 and thus to be able to move the tresses C to be shaped. The motorized roller 3 is able to roll the tresses C at a desired speed (for example according to the values described above) in order to obtain a satisfactory haircut result. The motorized roller 3 thus allows automating the haircut operation in order to obtain a hair straightening effect (according to the embodiment shown) for example by rolling the tresses of hair to be cut C between the hair straightening plates, as will be described in more detail below. However, the invention is not limited to a straight hair implementation and the motorized roller 3 may alternatively be used to move the hair strand C in order to provide the hair strand C with curls, waves or any other desired shaping effect. The motor 4 is, for example, an electric motor, and even more preferably a reduction motor. Thus, the motor 4 comprises, for example, a rotary drive shaft 4A, which rotary drive shaft 4A may either be formed directly by the output shaft of the motor 4 (variant not shown) or be moved by the output shaft 4B of the motor (variant shown in fig. 1 to 13), preferably by a reduction system comprising, for example, two pinion gears 40A, 40B, which two gears 40A, 40B are carried by the drive shaft 4A and the output shaft 4B, respectively. As shown, the motorized roller 3 is rotatably mounted with respect to the main body along a first rotation axis X-X', which preferably extends perpendicular to the median direction of movement of the tresses of hair C. In other words, the tresses of hair C are driven by the motorized roller 3 in a manner that moves transversely with respect to the longitudinal extension of the motorized roller 3.

In order to facilitate the local attachment of the locks of hair C to the motorized roller 3, at least the surface of the motorized roller 3 is composed of a suitable material, for example a material based on elastomer, rubber, silicon, foam (optionally impregnated with a care product for hair or a cosmetic … …). However, it is contemplated that other materials (e.g., metallic materials or plastic materials) may be used. As shown, the first rotation axis X-X' of the motorized roller 3 advantageously extends substantially parallel to the middle longitudinal extension of the hair-cutting device 1, in particular of the handle 2A thereof.

According to the embodiment shown in the figures, the body 2 is also equipped with guiding means 5 for guiding the tresses C, which guiding means 5 are arranged with respect to the motorized roller 3 in order to keep said tresses C against said motorized roller 3 along an angular contact sector α at least equal to 30 °, independently of the orientation of the device 1 in space with respect to the tresses C and with respect to the head of the user. In other words, the guiding means 5 are designed to bring the tresses C locally, preferably uniformly, against the surface portion of the motorized roller 3 in two half-planes P bisecting the common boundary constituted by the first rotation axis X-X _A 、P _B Extends between the two half planes P _A 、P _B Inclined with respect to each other by an angle alpha at least equal to 30 deg..

Since the guiding means 5 can take any suitable shape, the locks C locally surround the motorized roller 3 along sufficient angular contact sectors to achieve both:

allowing the tresses C to adhere sufficiently locally to the motorized roller 3 to carry out a completely reliable and safe driving of the tresses C by the motorized roller 3;

the diameter of the motorized roller 3 is minimized to permit the hair-cutting device 1 to engage the hair strand C closer to its root, that is to say to the end of the hair strand C that is connected to the skull of the user.

Regardless of the orientation of the device 1 with respect to the user, the use of a specific guide that causes implementation of an angular contact sector α at least equal to 30 ° ensures reliable driving of the hair tress C and allows to engage the hair tress C with the haircut device 1 located closer to the skull, thus maximizing the length of the hair tress C subjected to the shaping treatment operated by the device 1. The invention thus allows to benefit from an excellent compromise between the driving reliability of the hair tresses C on the one hand and the maximization of the length of the hair tresses straightened on the other hand. Advantageously, in order to facilitate the above-mentioned compromise, the angular contact sector α is at least equal to 45 °, even more preferably at least equal to 90 °. The angle α defines a portion of the periphery of the motorized roller 3 that contacts hair according to the diameter of the motorized roller 3. The value of the angle alpha and the value of the diameter of the motorized roller 3 are advantageously chosen with respect to each other (taking into account the tribological properties of the material forming the surface of the roller 3) in order to obtain the best possible compromise between the driving reliability of the hair on the one hand and the external dimensions on the other hand. For example, motorized roller 3, whose surface is made of silicon, has a diameter at least equal to 8 millimeters and has guides allowing angular contact sectors at least equal to 90 °, has proved to be particularly satisfactory, both from the point of view of the reliability of the driving of the hair by roller 3, and from the point of view of the practicality and quality of the results (the possibility of being closer to the skull).

In order to minimize the diameter of the motorized roller 3, it is also conceivable to use an even larger angular contact sector α, for example at least equal to 120 °. In general, the smaller the diameter of the motorized roller 3, the greater the angular contact sector α choice, in order to benefit from a reliable driving of the hair tresses C. In fact, the greater the angular contact sector α between the hair and the motorized roller 3, the higher the adhesion between the hair and the roller 3, which promotes the reliability of the driving of the tresses of hair C by the motorized roller 3.

As shown, the body 2 carries a gripping device 6 for gripping the locks C to be cut. The clamping means 6 are used to ensure the local shaping of the hair strand C, by applying mechanical stress (pressure), preferably accompanied by thermal provision, to the hair strand C, for example to ensure the straightening of the hair strand C. The clamping means 6 advantageously comprise a first pressure surface 7 and a second pressure surface 8, the first pressure surface 7 and the second pressure surface 8 being movable relative to each other between:

on the one hand is an introduction configuration (figures 8 to 13 and 15), according to which said first and second pressure surfaces 7, 8 are sufficiently spaced apart from each other to allow the insertion of said hair tresses C therebetween;

on the other hand, a gripping configuration (figures 1 to 7, 14 and 16), according to which said pressure surfaces 7, 8 are sufficiently close to grip said hair C therebetween, said hair tresses C then being inscribed in a median plane P corresponding to the interface of said first and second pressure surfaces 7, 8 _M And (3) inner part.

The clamping force exerted by the pressure surfaces 7, 8 is for example between 10N and 50N, for example about 30N. Thus, the introduction configuration is an open configuration allowing the user to position one or more hair tresses C in the gripping means 6, whereas in the gripping configuration the gripping means 6 exert a gripping on said one or more hair tresses C, that is to say the gripping means 6 exert a local pressure on said one or more hair tresses C housed inside them.

Each of said first and second pressure surfaces 7, 8 for local contact with the hair strand C to shape it is advantageously substantially flat, so as to obtain a hair straightening effect. In this preferred embodiment, both the first and the second pressure surface 7, 8 are parallel to the median plane P, at least in the clamped configuration _M The middle plane P _M Representing the contact plane of said first and second pressure surfaces 7, 8 in the clamped configuration. Of course, the invention is by no means limited to the implementation of the first and second pressure surfaces 7, 8 which are flat, and it is entirely conceivable, for example, that at least one of said pressure surfaces 7, 8 has, for example, an irregular surface, a wavy surface (for example, to achieve curly, perm or wavy hair) or other surfaces, in order to obtain a shaping effect which differs from the straightening effect. At least one of said pressure surfaces 7, 8 may also comprise one or more protrusions, such as teeth or pins or the like. The pressure surfaces 7, 8 are preferably of complementary conjugate shape (e.g. one convex and the other concave, or the surfaces 7, 8 comprise corresponding teeth in a staggered arrangement, or as shown, the two surfaces 7, 8 are substantially flat and planar).

Advantageously, the clamping means 6 are provided with heating means for simultaneously clamping and heating the tresses of hair C to be shaped. Heating means may for example be carried in one and/or the other of said first and second pressure surfaces 7, 8 for heating hair, preferably by conduction, while pressing said hair. In this case, the heating means advantageously comprise a resistive heating element, for example of the type of a positive temperature Coefficient (CTP) heating element. Preferably, each of said first and second pressure surfaces 7, 8 forms a heating surface, which is adjusted to a temperature advantageously between 100 ℃ and 200 ℃, for example to about 170 ℃. Preferably, the motorized roller 3 is "cold", that is to say, the motorized roller 3 is not heated and is therefore substantially at room temperature, which promotes rapid cooling of the tresses C at the outlet of the pinching device 6. This cooling is facilitated by the use of angular contact sectors at least equal to 30 °, which allows to benefit from a meaningful heat exchange surface. This cooling, advantageously aided by the motorized roller 3, may help to improve the shaping by the clamping device 6.

Advantageously, the first pressure surface 7 is mounted in a circular translation (translation circulaire) with respect to the body 2 between an open position corresponding to the introduction configuration and a closed position corresponding to the clamping configuration. The use of such a circular translational movement implemented in the embodiments of fig. 1 to 13 allows the first pressure surface 7 to remain permanently parallel to itself when it is moved from its open position to its closed position (or vice versa, i.e. from its open position to its closed position). In other words, the first pressure surface 7 in this case advantageously has a constant orientation and steady state with respect to the body 2. This feature allows to apply a particularly uniform and even force to the hair strand C to be shaped, independently of the positioning of the hair strand C in the clamping means 6. This allows in particular to avoid any untimely pinching of some of the hairs constituting the hair tress C to be cut.

Preferably, according to the embodiment of fig. 1 to 13, the second pressure surface 8 is also movably mounted with respect to the body 2 between an open and a closed position corresponding to the introduction configuration and the clamping configuration, respectively. Even more preferably, said second pressure surface 8 is also mounted in circular translation with respect to the body 2 between its open and closed positions. Advantageously, according to the embodiment of fig. 1 to 13, the first and second pressure surfaces 7, 8 are designed to move simultaneously according to respective circular translational movements in opposite directions. This means that the first and second pressure surfaces 7, 8 are according to a relation to the intermediate plane P when the clamping device 6 is transferred from its clamping configuration to its introduction configuration _M The symmetrical respective movements are simultaneously moved away from each other until their respective open positions corresponding to the maximum spacing between said first and second pressure surfaces 7, 8 are reached. The first and second pressure surfaces 7, 8 advantageously move in phase so that when it isEach in its respective closed position, the clamping means 6 then occupy their clamping configuration.

As shown in fig. 1 to 13, the hair-cutting apparatus 1 advantageously comprises a control device 9, which control device 9 is movably mounted with respect to the main body 2. The control means 9 are preferably connected to the clamping means 6 and can be actuated manually to transfer said clamping means 6 from their clamping configuration (fig. 1 to 7) to their introduction configuration (fig. 8 to 13). The control means 9 comprise, for example, at least one first button 90 (or trigger), which first button 90 is pivotally mounted with respect to the body 2 and is adapted to apply a force to the first pressure surface 7 to cause it to be transferred from its closed position to its open position in response to a manual actuation of the first button 90. Preferably, the control means 9 further comprise a second button 91, which second button 91 is designed to control itself the movement of the second pressure surface 8 between its closed and open position. For example, the body 2 advantageously carries a first link 10 and a second link 11, the first link 10 and the second link 11 each extending between a respective first end 10A, 11A and a respective second end 10B, 11B, the respective first end 10A, 11A being connected (by articulation, preferably by pivoting) to said body, the respective second end 10B, 11B being connected (by articulation, preferably by pivoting) to said first pressure surface 7. The mounting implementation of this deformable parallel quadruple (montage de parall e) by means of the first and second links 10, 11 thus allows the first surface 7 to be moved with respect to the body 2 between an extended condition (corresponding to the closed position) and a retracted condition (corresponding to the open position). In this preferred embodiment, the first button 90 and the first link 10 are provided with respective interengaging surfaces for transmitting a manual control force applied by a user to the button 90 to said first link 10 to cause the clamping device 6 to be transferred from its clamped configuration to its introduced configuration.

Advantageously, the second pressure surface 8 is also mounted in circular translation with respect to the body 2 by means of a pair of links 12, 13 according to an arrangement preferably symmetrical to that implemented for the first pressure surface 7 described previously. Thus, the body 2 carries third and fourth links 12, 13, the third and fourth links 12, 13 each extending between a respective first end 12A, 13A and a respective second end 12B, 13B, the respective first end 12A, 13A being connected to the body 2, the respective second end 12B, 13B being connected to the second pressure surface 8.

In order to carry out the simultaneous and symmetrical displacement of the above-mentioned first and second pressure surfaces 7, 8, the two buttons 90, 91 are advantageously connected to each other by means of a force transmission means, for example formed by a transmission link 14, such that an actuation force applied to one of the buttons 90, 91 is automatically and concomitantly transferred to the other button 91, 90, or vice versa, an actuation force applied to one of the buttons 91, 90 is automatically and concomitantly transferred to the other button 90, 91. Thus, the use enables to actuate the control means 9 advantageously with a single finger, while holding the device 1 with the rest of the same hand. Thus, the device 1 permits hair shaping (e.g. straightening) using one hand in a particularly advantageous form as shown in its figures.

However, the use of a first and a second pressure surface 7, 8 mounted in a circular translation with respect to the fixed body 2 is not mandatory and, for example, it is possible to use a first and a second pressure surface 7, 8 connected to each other by a hinge according to a second embodiment shown in fig. 14 and 15, instead of a circular translation movement, to allow a relative pivoting of the first and the second pressure surface 7, 8, without departing from the scope of the invention. In the second alternative embodiment of fig. 14 and 15, the body 2 is thus constituted by two subassemblies 200, 210 hinged with respect to each other, so as to form a clamp, the jaws of which in this case carry the first and second pressure surfaces 7, 8.

Advantageously, the clamping configuration of the clamping device 6 is a reset configuration, and the hair-cutting apparatus 1 comprises for this purpose a reset member of the clamping device 6 in the clamping configuration. In other words, the return member is designed to exert a return force on the clamping device 6, either directly or indirectly, preferably permanently, in order to force the clamping device 6 to remain in the clamped configuration without a user exerting an opposite force through the control device 9. This means that the hair-cutting apparatus 1 is designed such that its clamping device 6 is in the clamped configuration by default when it is idle. In other words, the device 1 adopts a natural closing/clamping configuration corresponding to the clamping configuration without external application of force. This allows to obtain an optimal hair shaping result independent of the expertise and the handling of the user. For example, the resetting means are designed such that the clamping force exerted by the clamping means 6 in the clamped configuration is between approximately 10N and 50N, and preferably approximately equal to 30N.

Thanks to this feature, the pressure exerted locally by the gripping means 6 on the tresses of hair C to be shaped is not dependent on the manual force exerted by the user, but only on the return member. It is thus possible to overcome the closing force exerted by the user, which facilitates the use of the device 1 and facilitates the obtaining of optimal results, irrespective of the expertise and skills of the user. The return member may be present in various forms and exert an elastic return force, for example by means of a spring or other elastomer, or by jointly implementing a magnet (permanent or electromagnet) and a ferromagnetic material element cooperating with said magnet (according to the embodiments of figures 1 to 13). For example, in the embodiment of fig. 1 to 13, each of the first and third links 10, 12 carries a respective permanent magnet 15, 16, which respective permanent magnet 15, 16 cooperates with a respective plate 150, 160 of ferromagnetic material fixedly attached to the body 2. Thus, without the user applying force to one and/or the other of the buttons 90, 91, the first and third links 10, 12, thanks to their respective magnets 15, 16 carried by them, return against the corresponding plates 150, 160 of ferromagnetic material, thus maintaining the first and second pressure surfaces 7, 8 along an inscribed median plane P _M The contact planes of which are pressed against each other.

Advantageously, and according to the embodiment shown in the figures, the guide means 5 comprise said gripping means 6, that is to say the gripping means 6 are part of the guide means and thus help to ensure a proper positioning of the tresses C with respect to the motorized roller 3, to locally keep said tresses C in contact with the surface of the motorized roller 3 along an angular contact sector α at least equal to 30 °, as previously described. In the embodiment shown in the figures, the gripping means 6 are preferably arranged upstream of the motorized roller 3, taking into account the direction of movement D of the tresses C with respect to the body 2. The motorized roller 3 is therefore advantageously designed to pull the tresses C through the gripping means 6, so as to slide them between the first and second pressure surfaces 7, 8 to their respective closed positions corresponding to the gripping configuration (see fig. 16). In the embodiment shown in the figures, the motorized roller 3 is advantageously arranged substantially adjacent to the gripping device 6 and preferably in close proximity, so that, under the effect of the traction force exerted by the motorized roller on the tresses of hair C, a portion of said tresses of hair C coming out of the gripping device 6 then come into contact with the motorized roller 3 at the outlet of the gripping device 6 (taking into account the direction of movement D of the tresses of hair C with respect to the body 2).

According to a preferred embodiment illustrated in the accompanying drawings, the guiding means 5 are advantageously arranged with respect to said motorized roller 3 and the gripping means 6 so as to cause the tresses C to follow the median plane P, taking into account the direction of movement D of said tresses C with respect to the body 2 _M The intersecting intermediate direction a moves downstream of the angular contact sector a. In the embodiment shown in the figures, the tresses are thus directed downwards in direction a under the effect of the rotation of the motorized roller 3 in the first direction S1 (see fig. 16).

In a particularly advantageous embodiment, the angular contact sector α is substantially less than or equal to 135 ° in order to avoid marking the locks of hair or imparting undesired shaping thereof, such as permanent waving or curling, contrary to the desired result and shaping (such as straightening) by the pressure surfaces 7, 8. Even more preferably, the angular contact sector α is both substantially greater than or equal to 90 ° and substantially less than or equal to 135 °. This preferred range of angular contact sectors α advantageously ranging from 90 ° to 135 ° allows, in particular:

maximizing the contact arc length between the tresses C and the motorized roller 3, while avoiding imparting to the hair an undesired shaping (in particular of the curly or perm type) or "marking" the hair; shaping, preferably hair straightening, is advantageously ensured by shaping means separate and distinct from motorized roller 3; said shaping means are formed, for example, by clamping means 6 described below.

And/or orienting the hair tresses C at the outlet of the device 1 downwards along a disengagement direction (direction a advantageously corresponding to the desired direction in which the hair is finally positioned), advantageously parallel to the face and substantially corresponding to the natural position of the hair tresses along the head.

Advantageously, said guiding means 5 further comprise a pressing roller 17, which pressing roller 17 is adapted to locally press the tresses C against the motorized roller 3, in order to advantageously allow or at least facilitate the friction driving of said tresses C by the motorized roller 3. As shown, the pressure roller 17 advantageously has a length substantially similar to that of the motorized roller 3 and therefore acts as a mating cylinder, so as to locally insert and press the hair tresses C to be cut between the motorized roller 3 and the pressure roller 17 according to the principle of two opposite rollers, for example of a rolling mill (see fig. 16). The pressure roller 17 is advantageously designed so as to adopt at least one pressure configuration in which the pressure roller 17 is able to exert a pressure on the tresses of hair C to bring them against the motorized roller 3. Advantageously, the pressure roller 17 is also advantageously designed so as to be able to adopt a disengaged configuration according to which the pressure roller 17 is sufficiently distanced from the motorized roller 3 so as not to contribute to pressing the tresses of hair C against the motorized roller 3. Preferably, the pressure roller 17 is in a pressure configuration when the clamping device 6 is in the clamped configuration, and the pressure roller 17 is in the disengaged configuration when the clamping device 6 is in the introduced configuration.

Just like the motorized roller 3, the pressing roller 17 preferably has a substantially cylindrical shape with a circular quasi-curve, advantageously having substantially the same diameter as the motorized roller 3. However, it is entirely conceivable, without departing from the scope of the invention, for the diameter of the pressure roller 17 to be smaller (as shown in fig. 7) or conversely larger than the diameter of the motorized roller 3.

The pressure roller 17 is advantageously mounted so as to be freely rotatable, that is to say, the pressure roller 17 is preferably not motorized and can freely rotate about a second axis of rotation YY ', which is advantageously arranged parallel to the first axis of rotation X-X' of the motorized roller 3 in the pressing configuration.

In the embodiment of fig. 1 to 13, the second axis of rotation Y-Y 'of the pressure roller 17 is advantageously permanently (that is to say, both in the pressure configuration and in the disengaged configuration) arranged parallel to the first axis of rotation X-X' of the motorized roller 3. In contrast, in the alternative embodiment of fig. 14 and 15, the first and second axes of rotation X-X ', Y-Y' are parallel to each other (fig. 14) only when the pressure roller 17 is in the pressure configuration, and conversely, are inclined relative to each other when the pressure roller 17 adopts its disengaged configuration (fig. 15).

Advantageously, the pressing roller 17 is arranged downstream of the angular contact sector α, taking into account the direction of movement D of said tresses C with respect to the body 2. It is therefore particularly advantageous that the contact zone (corresponding to the angular contact sector α) between the tresses C and the motorized roller 3 is provided between, on the one hand, the gripping means 6 and, on the other hand, the pressing roller 17, the gripping means 6 being oriented along the entry direction (inscribed in the plane P _M In) upstream of the angular contact sector α, the pressure roller 17 guides the tresses C downstream of the angular contact sector α along an outlet direction (direction a), said inlet and outlet directions intersecting to thus allow pressing the tresses C against the motorized roller 3 along said angular contact sector α, promoting a reliable adhesion driving of the tresses C by the motorized roller 3.

The pressure roller 17 is also preferably unheated and therefore substantially at ambient temperature to facilitate cooling of the tresses described above.

Advantageously, the pressing roller 17, when it is in the pressing configuration, therefore presses the tresses C against the motorized roller 3, thus allowing said motorized roller 3 to frictionally drive the tresses C, the pressing roller 17 itself being driven in rotation by the tresses C thus moved along a second direction S2 opposite to said first direction S1 of rotation. Just like the motorized roller 3, the pressing roller 17 is preferably made of a material that promotes the localized adhesion of hair, such as a rubber, elastomer, or foam type material. In the embodiment shown in the figures, the pressure roller 17 is freely rotatable, but according to an alternative variant, not shown, it is entirely conceivable that the pressure roller 17 is also directly electrically powered.

According to a preferred embodiment shown in the drawings, the motorized roller 3 and the pressure roller 17 are integral with the first and second pressure surfaces 7, 8, respectively, such that the motorized roller 3 advantageously moves with the first pressure surface 7 and the pressure roller 7 advantageously moves with the second pressure surface 8. Thus, when the clamping device is in the clamped configuration, the pressure roller 17 advantageously reaches its pressed configuration, and when the clamping device 6 is in the introduced configuration, the pressure roller 17 reaches its disengaged configuration. Alternatively, it is conceivable that the motorized roller 3 is integrated with the second pressure surface 8 and the pressure roller 17 is integrated with the first pressure surface 7.

Advantageously, the first rotation axis X-X' forms, in the clamped configuration, on the one hand, a boundary of a first half-plane P1 and, on the other hand, a boundary of a second half-plane P2, the first half-plane P1 being parallel to said intermediate plane P _M And extends outside the apparatus 1, the second axis Y-Y ' being inscribed in this second half-plane P2, said second half-plane P2 coinciding with the first half-plane P1 (in this case the two rollers 3, 17 are side by side, both their respective first and second axes of rotation X-X ', Y-Y ' being inscribed parallel to the median plane P _M Is inclined by an angle beta of less than 60 deg., preferably less than or equal to 45 deg., with respect to the first half-plane P1). Thus, in the embodiment shown in the figures, the first rotation axis X-X' is inscribed perpendicular to the median plane P _M While the second axis of rotation Y-Y' is also perpendicular to the median plane P _M And in a second plane parallel to said first plane, which second plane in question is different from the first plane and is further away from the clamping means 6 than the first plane, such that the first plane is interposed between the second plane and the clamping means 6. In other words, the pressure roller 17, when it is in the pressure configuration (advantageously corresponding to the gripping configuration of the gripping means 6), is advantageously not vertically aligned with the motorized roller 3, but is instead disposed substantially laterally with respect to the motorized roller 3 (see figure) so as to be more external to the device 1 than the motorized roller 3. This means that the pressure roller 17 is offset to the outside of the apparatus 1 relative to the motorized roller 3 such that a contact plane P between the two rollers 3, 17 perpendicular to the plane P2 _C Relative to the median plane P _M An inclination of for example more than 10 °, preferably more than 45 ° and advantageously between 45 ° and 135 ° (from the median plane P _M To the contact plane P _C Measured in a clockwise direction), the first axis of rotation X-X 'and the second axis of rotation Y-Y' are inscribed simultaneously in the plane P2. For example, according to the embodiment of fig. 14, the contact plane P _C (which is substantially tangential to both the motorized roller 3 and the pressure roller 17) is substantially perpendicular to the median plane P _M . This arrangement allows to draw the locks C along the median plane P at the exit of the interface area of the rollers 3, 17 _M Non-coplanar directional orientation, preferablySo as to orient the hair strand C downwards, so as to pass through the hair strand C by the clamping means 6 in this case at the median plane P _M The internal thermo-mechanical shaping treatment is followed by automatic repositioning of the hair strand C in its natural position along the head. This arrangement also allows to promote a sufficiently large driving contact between the tresses C and the motorized roller 3 to ensure a reliable movement of the tresses C without having to use motorized rollers 3 of too large a diameter, which would make the device 1 bulky and prevent the device 1 from coming closer to the skull of the user.

Advantageously, the pressure roller 17 and the motorized roller 3 are designed to move relative to each other between:

a closing position (figures 1 to 7 and 14), advantageously corresponding to the gripping configuration of the gripping means 6, in which the pressure roller 17 is sufficiently close to the motorized roller 3 to press the tresses C against the motorized roller 3 to establish a friction-driven mechanical connection of the tresses C; and

The separated position (figures 8 to 13 and 15), in which the pressing roller 17 is sufficiently far away from the motorized roller 3 so as not to press said tresses C against the motorized roller 3, advantageously corresponds to the introduction configuration of the gripping means 6.

As shown, and as mentioned above, the motorized roller 3 is advantageously integral with the first pressure surface 7 to move therewith, while the pressure roller 17 itself is integral with said second pressure surface 8 to move therewith, reaching said approaching position when said first and second pressure surfaces 7, 8 are in the clamped configuration, and reaching said separating position when said first and second pressure surfaces 7, 8 are in the introduced configuration.

Advantageously, and according to the embodiment of fig. 1 to 13, the clamping device 6 comprises a first frame 18, which first frame 18 is movably mounted with respect to the body 2 between a clamping position corresponding to the clamping configuration and an introduction position corresponding to the introduction configuration, said first frame 18 carrying the first pressure surface 7 and the motorized roller 3. The first frame 18 is therefore advantageously designed to move in a circular translation with respect to the body 2, so as to move the first pressure surface 7 between its gripping and introduction configuration and to move the motorized roller 3 between its approaching and separating positions. Advantageously, the clamping device 6 further comprises at least one second frame 19, which second frame 19 is also mounted movably with respect to the body 2 between a clamping position corresponding to the clamping configuration and an introduction position corresponding to the introduction configuration of the clamping device 6. The second frame 19 advantageously carries said second pressure surface 8 and a support 20, the support 20 itself carrying the pressure roller 17. The first and second frames 18, 19 advantageously form respectively a first and a second jaw movable with respect to the body 2 for gripping the hair strand C to be straightened, while permitting said hair strand C to slide between said jaws under the action of the movement of said hair strand C, which is produced by the co-operation of the motorized roller 3 with the pressure roller 17. The pressing roller 17 is rotatably mounted with respect to the support 20 along a second axis Y-Y ', and movement of the second frame 19 with respect to the main body 2 simultaneously causes movement of the pressing roller 17 and the second axis of rotation Y-Y' with respect to the main body 2. The support 20 itself is advantageously mounted movably with respect to the second frame 19 between at least a rest position, which the support 20 occupies when the second frame 19 is in the introduction position, and an engagement position, which the support 20 occupies when the second frame 19 reaches its clamping position. Thanks to this ability of the pressure roller 17 and thus the second axis of rotation Y-Y' of this pressure roller 17 to move with respect to the second frame 19, the hair-cutting device 1 can adapt to the characteristics of the tresses C, and in particular the thickness of the tresses C, by preferably automatically adjusting the size of the gap space between the pressure roller 17 and the motorized roller 3, so as to promote a localized adhesion contact while avoiding the possibility of seizing the tresses C between the rollers 3, 17.

More precisely, the support 20 is advantageously rotatably mounted along a third rotation axis Z-Z' integral with the second frame 19 and therefore moving with the second frame 19. Preferably, the engagement position of the support 20 is therefore floating, to accommodate the thickness of the hair tresses C. In other words, the support 20 is advantageously floatingly mounted with respect to the second frame 19 so as to be freely movable with respect to the second frame 19, preferably pivotally movable along a third rotation axis Z-Z' with respect to the second frame 19 between its rest position and the engagement position. This allows adapting the position of the pressure roller 17 to the thickness of the tresses of hair C inserted between said motorized roller 3 and pressure roller 17.

Preferably, as shown, the support 20 and the body 2 are provided with respective complementary interengaging surfaces 201, 21, these complementary interengaging surfaces 201, 21 cooperating to convert movement of the second frame 19 (preferably according to a circular translational movement) relative to the body 2 into rotational movement of the support 20 relative to the second frame 19, so as to thereby control the transfer of the support 20 from its rest position to its engaged position, or vice versa, i.e. from its engaged position to its rest position. To this end, the interengaging surfaces 21 provided on the support 20 form a cam path along which one or more cam followers (e.g. spherical as shown) forming the interengaging surfaces 201 of the support 20 abut and move. Preferably, elastic return means are also provided to permanently return the interengaging surfaces 201, 21 against each other. The return means are for example in the form of springs which permanently force the cam follower 21 integral with the support 20 against the cam surface 201 integral with the body 2. This floating mounting, controlled by the cam, thus allows to automatically bring the pressure roller 17 into a fully functional position with respect to the motorized roller 3 when the clamping device 6 is transferred from the introduction configuration to the clamping configuration.

It is alternatively also conceivable, without departing from the scope of the present invention, for the transfer of the support 20 from its rest position to its engagement position to be obtained by direct engagement of the pressure roller 17 by the motorized roller 3, so that when the device 1 is closed (from the introduction configuration to the gripping configuration), the pressure roller 17 abuts against the motorized roller 3 and rolls on the motorized roller 3 to be pushed back sideways and to reach its approaching position, allowing the actuation of the hair tresses.

Preferably, in order to optimize the contact between the rollers 3, 17 and the tresses C, the rollers 3, 17 remain permanently parallel to each other according to the embodiment of figures 1 to 13.

Preferably, the hair-cutting apparatus 1 comprises first and second complementary coupling members 23, 24, which first and second complementary coupling members 23, 24 are attached to the motor 4 and the motorized roller 3, respectively. More precisely, the driving shaft 4A advantageously carries a first coupling member 23, while the driven shaft 3A integral with the motorized roller 3 carries a second coupling member 24. The first and second complementary coupling parts 23, 24 are advantageously movable with respect to each other between, on the one hand, a coupling configuration (fig. 1 to 7) corresponding to the approaching position of said pressure roller 17 and electric roller, and, on the other hand, a decoupling configuration (fig. 7 to 8) in which said first and second complementary coupling parts 23, 24 are in contact with each other to allow the electric motor 4 to move the electric roller 3, corresponding to said separating position of said pressure roller and electric roller 3, in which said first and second complementary coupling parts 23, 24 are distanced from each other such that the electric motor 4 cannot move the electric roller 3. In other words, in the coupled configuration, the first and second complementary coupling members 23, 24 are in contact with each other, so as to create a mechanical connection between them that allows to transmit the movement of the motor 4 to the motorized roller 3, so as to cause the motorized roller 3 itself to move the lock of hair C with respect to the body 2. In contrast, in the decoupled configuration, the first and second complementary parts 23, 24 remain separated from each other so as to be no longer in contact, which interrupts the kinematic chain between the motor 4 and the motorized roller 3 and thus prevents any possible force from the motor 4 from being transmitted to the rotating driven shaft 3A. The transfer from the coupling configuration to the decoupling configuration thus advantageously takes place simultaneously with the transfer of the clamping device 6 from the clamping configuration to the introduction configuration, and is also controlled by manual actuation of the control member 9. Advantageously, the hair-cutting apparatus 1 further comprises a torque limiter designed to automatically decouple said driving shaft 4A and driven shaft 3A when the following two conditions are met:

Said first and second complementary coupling parts 23, 24 are in a coupled configuration; and

the torque transmitted to the driven shaft 3A reaches or exceeds a predetermined threshold, for example between 40mn.m and 120mn.m, preferably equal to 80mn.m.

The torque limiter is therefore advantageously designed to play its role only when the first and second complementary coupling parts 23, 24 are coupled, and to allow automatic interruption (without the need for user intervention) of the transmission between the motor 4 and the roller 3 if, for example, jamming of the drive means formed by the rollers 3, 17 occurs. The torque limiter may take any known form and consists of, for example, a friction torque limiter or an obstacle-free torque limiter (e.g., tooth, roller, or ball). According to a particularly preferred embodiment shown in the drawings, the first and second complementary coupling parts 23, 24 themselves form said torque limiter in their coupled configuration. In this case, said first and second complementary coupling parts 23, 24 advantageously mutually engage by adhesion (to form a friction torque limiter) or by obstruction (to form a friction-free torque limiter, for example, toothed, roller or ball) in the coupling configuration and slide with respect to each other once the above threshold is reached.

Preferably, the body 2 is further equipped with a comb device 22 for combing the locks of hair C for movement by the motorized roller 3. The comb device 22 is advantageously arranged upstream of the gripping device 6 with respect to the direction of movement D of the tresses of hair C. The comb device 22 comprises a plurality of teeth or bristles, for example arranged in rows or tufts, so as to form a comb or brush. The comb device 22 advantageously allows to divide the hair tresses C to be shaped into a plurality of small elementary hair tresses and to distribute them well over the treatment surface formed by the pressure surfaces 7, 8. The comb device 22 thus allows the hair strands C to spread well between the jaws to facilitate their shaping by the surfaces 7, 8, which surfaces 7, 8 are preferably exothermic. Preferably, the comb device 22 also ensures the tensioning function of the tresses C, in particular by making the local friction resistance of the tresses C opposite to the traction operated by the conjugated pair of motorized roller 3/pressure roller 17. In the preferred embodiment of fig. 1 to 13, the comb device 22 itself is pivotally mounted between a folded position, in which the comb device 22 occupies when the gripping device 6 is in the introduction configuration, in order to house the hair tresses C inside the gripping device 6, and a raised position, in which the comb device 22 occupies when the gripping device 6 is in the gripping configuration. The transfer of the other from one of said folded and raised positions is advantageously automatic and is obtained, for example, by means of cam-type driving means, to transform the movement of the first frame 18 into a movement of the comb device 22. For example, the comb device 22 is provided with a cam surface 22A, which cam surface 22A cooperates with a complementary surface 22B, which complementary surface 22B forms a cam follower integral with the first frame 18, the comb device 22 advantageously being permanently returned to its raised position, for example by means of a spring, and the comb device 22 being pushed into its folded position by the cooperation of the surfaces 22A, 228 when the first frame 18 is returned from its engaged position to its introduction position. However, according to the alternative embodiments of fig. 14 and 15, it is entirely conceivable that the comb device is fixedly mounted. However, a mobile mounting such as that of fig. 1-13 is preferred because it allows for particularly efficient tensioning and combing.

The invention finally allows, in particular in its preferred embodiment of fig. 1 to 14, to automatically straighten hair strands in a particularly reliable, simple and quick manner, while permitting the hair-cutting device 1 to be positioned closer to the skull of the user, so as to straighten the hair strands over a maximum length.

The invention thus relates to a hair-cutting device 1 which is preferably specially designed for straightening hair and whose closed position of the pressure surfaces 7, 8 corresponds to the natural configuration (rest configuration) of the device 1. In this natural rest position, corresponding to the gripping configuration of the gripping means 6, the motorized roller 3 and the pressure roller 17 are in a close position, while the control means 9 are in a resilient return extended position.

Applying pressure to the control means 9 against the elastic return force permanently applied to the control means 9 allows to transfer the device 1 from its stable rest configuration to an unstable open configuration in which the device 1 is held by manual action of the control means 9 by the user to force the control means 9 to occupy its second position. Once the apparatus 1 is in the open configuration, the pressure roller 17 is distanced from the motorized roller 3 (the separated position), while the gripping device 6 is in the introduction configuration. Once the user releases his manual force on the control means 9, the device 1 spontaneously returns to its natural rest configuration (closed configuration described above).

The operation and use of the device 1 is for example as follows.

The user first grasps the hair tresses C with one hand and the device 1 with the other hand, ready to position the device 1 on or at least close to the scalp thereof, such that the motorized roller 3 and the pressure roller 17 are disposed in proximity to the scalp, while the comb means 22 are disposed opposite said rollers 3, 17, further away from the scalp.

The user then actuates the control means 9 to thereby urge the device 1 out of its normally closed configuration to reach its unstable open configuration. The user can then move the device 1 to easily place the locks C inside the device 1, both between the motorized roller 3 and the pressure roller 17, on the one hand, and between the first and second pressure surfaces, and between the teeth of the comb device 22, on the other hand. Once the hair strand C is placed inside the device 1, the user releases the control means 9, so that the device 1 is reset to its normally closed configuration in which the driving means formed by the rollers 3, 17 are then able to drive the hair strand C to be shaped. The tresses C then travel at a suitable speed into the comb device 22 and then into the clamping device 6 (between the pressure surfaces 7, 8), which clamping device 6 suitably clamps the hair, so as to straighten the tresses C in a particularly permanent, rapid and automatic manner.

Claims

1. A hair-cutting apparatus (1) designed to be gripped and handled by hand and comprising a main body (2), said main body (2) carrying at least one motorized roller (3), said motorized roller (3) being rotatably mounted with respect to said main body in order to frictionally move a hair strand (C) to be cut with respect to said main body (2), said hair-cutting apparatus (1) being characterized in that said main body (2) also carries guiding means (5) for guiding said hair strand (C), said guiding means being arranged with respect to said motorized roller (3) in order to keep said hair strand (C) against said motorized roller along an angular contact sector at least equal to 30 °; -said body (2) carries clamping means (6) for clamping said hair tresses (C) to be cut, said guiding means (5) comprising said clamping means (6), said clamping means (6) comprising a first and a second pressure surface (7, 8), both of which are movable with respect to each other between:

-on the one hand an introduction configuration, according to which said first and second pressure surfaces (7, 8) are sufficiently spaced apart from each other to allow the insertion of said hair tresses (C) therebetween;

-on the other hand a clamping configuration, according to which the pressure surfaces (7, 8) are sufficiently close to each other for the purpose of being in Clamping the hair strand (C) therebetween, the hair strand (C) then inscribing in a median plane (P) corresponding to the interface of the first and second pressure surfaces (7, 8) _M ) An inner part;

the guiding means (5) comprise a pressing roller (17) for locally pressing the tresses (C) against the motorized roller to allow a friction drive of the tresses (C);

a contact plane (P) between the motorized roller (3) and the pressure roller (17) _C ) With respect to the median plane (P _M ) An angle of greater than 10 degrees.

2. Hair-cutting device (1) according to claim 1, characterized in that the angular contact sector (α) is at least equal to 45 °.

3. Hair-cutting device (1) according to claim 1, characterized in that the angular contact sector (α) is at least equal to 90 °.

4. The hair-cutting apparatus (1) according to claim 2, characterized in that the angular contact sector (a) is less than or equal to 135 °.

5. The hair cutting device (1) according to any one of claims 1 to 4, characterized in that the gripping means (6) arrange the motorized roller (3) upstream with respect to the body (2) with respect to the direction of movement (D) of the hair strand (C).

6. Hair-cutting apparatus (1) according to claim 5, characterized in that said guiding means (5) are arranged with respect to said motorized roller (3) and said gripping means (6) so as to cause said hair-strand (C) to follow a plane (P) with said median plane (P), taking into account the direction of movement (D) of said hair-strand (C) with respect to said body (2) _M ) The intersecting intermediate direction (a) moves downstream of the angular contact sector (α).

7. The hair cutting device (1) according to any one of claims 1 to 4, characterized in that the clamping means (6) are provided with heating means for simultaneously clamping and heating the hair tresses (C).

8. The hair-cutting device (1) according to any one of claims 1 to 4, characterized in that the main body (2) further carries a comb device (22) for combing the hair strands (C), which is moved by the motorized roller (3), the comb device (22) being arranged upstream of the gripping device (6) with respect to the direction of movement (D) of the hair strands (C).

9. Hair cutting device (1) according to claim 8, characterized in that said pressure roller (17) is arranged downstream of said angular contact sector (α) taking into account the direction of movement of said hair strand (C) with respect to said main body (2).

10. Hairdressing appliance (1) according to claim 9, characterized in that the motorized roller (3) and the pressure roller (17) rotate along a first and a second rotation axis (X-X ') and (Y-Y '), respectively, and are connected with the first and the second pressure surface (7, 8), respectively, the first rotation axis (X-X ') forming, in the clamped configuration, on the one hand, the boundary of a first half-plane (P1) and, on the other hand, of a second half-plane (P2), the first half-plane (P1) being parallel to the intermediate plane (P) _M ) And extends outside the device (1), the second rotation axis (Y-Y') being inscribed in the second half-plane (P2), the second half-plane (P2) either coinciding with the first half-plane (P1) or being inclined with respect to the first half-plane (P1) by an angle (β) smaller than 60 °.

11. Hairdressing appliance (1) according to claim 9, characterized in that the motorized roller (3) and the pressure roller (17) rotate along a first and a second rotation axis (X-X ') and (Y-Y '), respectively, and are connected with the first and the second pressure surface (7, 8), respectively, the first rotation axis (X-X ') forming, in the clamped configuration, on the one hand, the boundary of a first half-plane (P1) and, on the other hand, of a second half-plane (P2), the first half-plane (P1) being parallel to the intermediate plane (P) _M ) And extends outside the device (1),the second rotation axis (Y-Y') is inscribed in the second half-plane (P2), the second half-plane (P2) either coinciding with the first half-plane (P1) or being inclined with respect to the first half-plane (P1) by an angle (β) smaller than or equal to 45 °.

12. The hair-cutting apparatus (1) according to any one of claims 1 to 4, characterized in that the pressure roller (17) and the motorized roller (3) are designed to move relative to each other between:

-a closing position in which the pressure roller (17) is sufficiently close to the motorized roller (3) to press the tresses (C) against the motorized roller to establish a friction-driven mechanical connection of the tresses (C); and

-a detached position in which the pressing roller (17) is sufficiently far away from the motorized roller (3) so as not to press the tresses of hair (C) against the motorized roller.

13. Hair-cutting device (1) according to claim 12, characterized in that the motorized roller (3) is connected to the first pressure surface (7) to move therewith, while the pressure roller (17) is connected to the second pressure surface (8) to move therewith, the approaching position being reached when the first and second pressure surfaces (7, 8) are in the clamped configuration and the separating position being reached when the first and second pressure surfaces (7, 8) are in the introduced configuration.

14. Hairdressing apparatus (1) according to claim 13, characterized in that the clamping device (6) comprises at least one second frame (19), the second frame (19) being movably mounted relative to the main body between a clamping position corresponding to a clamping configuration and an introduction position corresponding to an introduction configuration, the second frame (19) carrying the second pressure surface (8) and a support (20), the support (20) carrying the pressure roller (17) itself, the support (20) being movably mounted relative to the second frame (19) between at least one rest position and an engagement position, the support (20) occupying the rest position when the second frame (19) is in the introduction position, the support (20) occupying the engagement position when the second frame (19) reaches its clamping position.

15. The hair cutting device (1) according to claim 14, wherein the engagement position is floating to accommodate the thickness of the hair strand (C).

16. The hair cutting device (1) according to the preceding claim 14, characterized in that the support (20) is pivotally mounted relative to the second frame (19) between its rest position and an engagement position.

17. The hair-cutting apparatus (1) according to any one of claims 1 to 4, characterized in that the hair-cutting apparatus (1) forms a hair straightener.