FR2495909A1 - PROCESS FOR TREATING THE END OF NATURAL FIBERS FOR TOOTHBRUSH - Google Patents

Abstract

1. Method of treating the free ends of natural bristles used for the making of tooth brushes, characterised in that it consists of applying the free ends of bristles to a wheel (10) according to a combined relative movement composed of a to-and-fro oscillation (14, 14') of the bristles above the wheel (10) in a plane perpendicular to the grinding plane, the said wheel (10) being rotated (N) about its axis (12), disposed parallel to the grinding plane, and in that the combined relative movement further comprises a simultaneous rotation (n) between the wheel (10) and the bristles, about an axis (13) substantially perpendicular to the grinding plane.

Description

The present invention relates to a method of treatment, and more

  particularly of sealing of the medullary canal of the natural fibers used

in the toothbrushes.

  Natural fibers used for making toothbrushes, such as bristles

  of wild boar or pork from Chunking have a gen-

  ral that shows them to a mini pipe.

  Therefore, all kinds of bodies

  for example, micro-organisms

  or dead, micro-food debris, saliva

  ve and toothpaste, are likely to penetrate inside the medullary canal, through the free end

  of each of these natural fibers, that is to say the former

  which is brought into contact with the teeth and gen-

cives when brushing.

  The object of the present invention is to propose a treatment method which makes it possible in particular to block the free end of the medullary canal of these fibers.

  to prevent any foreign body from entering.

  For this purpose, according to the present invention,

  the process of treating the natural fibers used

  The invention relates to the production of toothbrushes by applying the free end of the fibers to a grinding wheel in a combined movement. This combined movement is composed of a swinging back and forth fibers above a grinding wheel rotated about its axis, accompanied simultaneously by a rotation between the grinding wheel and the fibers, substantially in the grinding plane, that is to say, the plane tangential to the

  grinding wheel corresponding to the mean contact plane of the

  fibers with the surface of the grinding wheel.

  The rotation between the fibers and the grinding wheel,

  substantially in the grinding plane, is advantageous

  carried out around an axis passing through the axis of

  the grinding wheel and located in the plane of it.

  According to one characteristic of the invention, the method consists in first applying the fibers to the grinding wheel according to the previously defined combined movement, then in removing the end of the fibers from the surface of the grinding wheel, and in reapplying them a second time. fibers on it, according to the same combined movement,

  According to another advantageous characteristic

  According to the invention, the method consists in applying the end of the fibers to a grinding wheel according to the previously defined combined movement, and then moving and applying the fibers above a second grinding wheel according to

the same combined movement.

  Other features and benefits of

  the invention, and in particular, the speeds

  tials of rotation will appear on reading the

  detailed description which will follow and with regard to

  attached drawings given by way of non-limiting example and in which:

  FIG. 1 represents a schematic view

  that of the combined movement between the fibers and the grinding wheel.

  FIG. 2 represents a schematic view

  that of an embodiment of the device used

  for the implementation of the method.

  The combined movement schematically

  shown in Figure 1 is composed of a rocking back and forth 14, 14 'of the fibers above the grinding wheel rotated (N) about its axis 12, accompanied simultaneously by a rotation (n) between the grinding wheel 10 and the fibers, substantially in the grinding plane. -3-- T

  The grinding wheel 10 is rotated

  turn of its axis 12 in a movement represents

  the arrows referenced N in the figures

  res, using a tree, partially represented.

  The rotational drive shaft is, moreover and simultaneously, driven by a relative rotational movement, with respect to the natural fibers, rotation

  represented by the arrows referenced n in the figures

  res, about an axis 13 passing through the axis of rotation 12 of the grinding wheel 10 and located in the plane thereof, while being substantially perpendicular to the grinding plane. This second movement (n) causes a rotation between the fibers and the grinding wheel 10, substantially in the

grinding plan.

  The end of the fibers is, in addition, applied to the wheel 10 animated double movement previously described, in a movement back and forth, between two extreme positions illustrated at 14 and 14 '

  in Figure 1; this pendulum movement is effected

  killed on either side of a longitudinal plane

  dicular to the middle plane of the end of the fibers.

  The fibers thus applied on the grinding wheel

  can be bundled together according to an assembly

  ge or be previously arranged on

the support of a toothbrush.

  FIG. 2 represents a device used

  implemented for the implementation of a variant of the method

  according to the present invention to apply

  a first time the end of the fibers on a grinding wheel 10 according to the combined movement previously

  describes, then moves and applies the fibers to

  above a second grinding wheel 20 according to the same combined movement. To this end, the device consists of four wheels 10, 20, whose drive shafts are coplanar. Each of these wheels 10 and 20 is

  animated by the double movement previously described,

  respectively represented by the arrows N and n.

  Each grinding wheel rotates at a speed (N) of between 1000 and 5000 rpm, and preferably at a speed of 2400 rpm, while the rotation of each drive shaft grinds about axes 13 and 23 which their are perpendicular is carried out at a speed (n)

  between 50 and 250 rpm and preferably

  at a speed of 120 rpm.

  The method for treating and sealing the medullary canal of each fiber then consists, in a first step, in applying the end of the fibers to the grinding wheel 10 in a pendulum movement.

  between two extreme positions 14 and 14 ', and then

  in a second step, the fibers above the second grinding wheel 20 and to apply thereto, in a third step, the end thereof in a rocking motion between two extreme positions 24 and 24 ', the brush The teeth are then removed from the grinding station, as shown by the arrow of

reference A in FIG.

  According to an advantageous characteristic of the invention, the duration of a swing back and forth

  fibers above each grinding wheel correspond sen-

  the duration of a full rotation between

  fibers and the grinding wheel, in the grinding plane.

  In an example of implementation of the pro-

  given given by way of non-limiting example, each of the three previously defined times may last about

half a second.

  The method, object of the present invention, 24959t9 is well suited to all fiber diameters, they are extra-hard, hard, medium or flexible. The implementation of the process causes a friction which without burning the keratin, makes it penetrate micro-particles in the medullary canal. In addition, a printed torsion phenomenon occurs

  at the end of the fibers, this phenomenon changes the textu-

  fiber that tends to tighten and makes the fibers more resistant to brushing. These two

  phenomena, friction and torsion, conjugates and synchro-

  have the effect of blocking the ends of the fibers and rendering them hermetic to any penetration

foreign bodies.

  The implementation of the process on the other hand for the benefit of well rounding the end of the fibers and thereby to make them not

aggressive to the gums.

  Of course, the present invention is not limited to the embodiment which has just been described, from which other forms and other embodiments may be provided, without departing from the scope of the invention. for example, it is possible to obtain a rotation between the fibers and the grinding wheel, in the grinding plane, by rotation of said

fibers and no longer the grinding wheel.

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Claims (7)

  1 - Process for treating the free end of the natural fibers used for the preparation of toothbrushes, characterized in that it consists in applying the free end of the fibers to a grinding wheel (10) in a combined movement, consisting of of a rocking back and forth (14, 14 ') of the fibers above the wheel (10) rotated (N) about its axis (12), accompanied simultaneously by a   rotation (n) between the grinding wheel (10) and the fibers, sensi- in the grinding plane.   2 - Process according to claim 1, characterized in that the rotation between the fibers and the grinding wheel (10), substantially in the grinding plane, is performed about an axis (13) passing through the axis of rotation ( 12) of the grinding wheel and located in the plan of it.   3 - Method according to one of the claims   1 and 2, characterized in that it consists in applying   firstly the fibers on the grinding wheel (10) according to the combined movement, then to remove the end of the natural fibers from the surface of the grinding wheel (10),   and to reapply the fibers a second time   ci, according to the same combined movement.   4 - Process according to one of the claims   1 and 2, characterized in that it consists in applying   place the end of the fibers on a grinding wheel (10), according to the combined movement, and then move and apply the fibers over a second grinding wheel (20), according to the same combined movement.   5 - Process according to one of the claims   1 to 4, characterized in that each of the grinding wheels (10, 20) rotates at a speed of between 1000 and 5000 rpm and preferably at a speed of 2400 rpm.   6 - Process according to one of the claims   1 to 5, characterized in that the relative rotation   between the grinding wheel (10) and the fibers, in the grinding plane, is carried out at a speed of between 50 and 250 rpm, and preferably at a speed of of 120 revolutions per minute.   7 - Method according to one of the claims   1 to 6, characterized in that the duration of a swing back and forth fibers above   each grinding wheel (10, 20) corresponds to the duration of a rotation   between the fibers and the grinding wheel, in the grinding plan.