FR2514116A1 - ULTRAVIOLET RAY OVEN - Google Patents

Abstract

THIS IS AN OVEN OF THE KIND INCLUDING, IN AN ENCLOSURE 10, A SUPPORT 11 SPECIFIC TO THE RECEPTION OF AN OBJECT 13 TO BE TREATED, AND A SOURCE OF ULTRAVIOLET RAYS 12 PROVIDED WITH REGARD TO SAID SUPPORT 11. ACCORDING TO THE INVENTION , A FILTER 32 MOBILE MOUNTED BETWEEN THE SUPPORT 11 AND THE SOURCE OF ULTRAVIOLET RAYS 12 IS PROVIDED TO REMAIN IN THE ENCLOSURE 10 SO AS TO CYCLICALLY INTERCEPT THE BEAM EMITTED BY THE SAME; FOR EXAMPLE, SUCH A FILTER 32 IS ROTATING AROUND AN AXIS PARALLEL TO THE GENERAL DIRECTION OF EMISSION D OF THE SOURCE 12. APPLICATION IN PARTICULAR TO THE TREATMENT OF PLATES 13 BEARING A PHOTOGRAPH COATED WITH A BAKING VARNISH.

Description

The present invention relates generally

  ultraviolet radiation furnaces, and is particularly aimed at

  but not exclusively, those for the treatment of objects at least partially coated with a thick layer varnish which is to be cooked. It may be, for example, plates, or other items of this kind, on which has been reported, by gluing,

  a photograph to be varnished to ensure

  tection and give the whole the desirable finish.

  In general, the furnaces usually used for the treatment of such articles comprise, in a chamber, a support specific to the reception of an object to be treated, and a source of ultraviolet rays disposed opposite said support.

  But in the implementation of these ovens, various pre-

sureties are to be taken.

  First of all, it is important first to temper the intensity of the ultraviolet radiation applied to the varnish to be cooked, leaving only its full value afterwards.

this radiation.

  In the absence of such a precaution, the unavoidable degassing, due for example to the presence of air bubbles between the photograph and the varnish which covers it, does not have time to take place properly before the capture of the this, so that, after cooking, such air bubbles are occluded in

  this varnish to the detriment of the desired finish.

  Similarly, because of the thickness of the varnish, if it becomes en masse too quickly, the surface tension of its upper layer do not have time to balance and

  can lead to the formation of ripples on its surface.

  To avoid such drawbacks, it has been proposed to temporarily interpose on the ultraviolet radiation, at the beginning of the cycle, a filter, in practice a simple glass filter,

  to ensure partial absorption of this radiation.

  But to this day, such a filter forms a self-supporting accessory

  the operator must place by hand in the kiln that he is responsible for and that he must also remove from the

hand of it.

  Such manipulation is tedious, it is generally

  loss of time, it imposes the effective mobilization

  the operator, and is left to the discretion of the operator. In addition, it is not safe for the latter, which must intervene in the furnace enclosure while the ultraviolet light source present in it is in action.

  The operation of such a source of ultraviolet radiation

  violet in fact to be in permanent practice to avoid the difficulties of re-assembly when it is hot, a second precaution to take in the implementation of the ovens of the kind concerned is to spare the radiation to

  the operator when he intervenes in the enclosure of such an oven.

  It has been proposed for this purpose to equip these furnaces with two stations, between which the source of

ultraviolet rays.

  But this provision inevitably leads to

  relatively complex, expensive, and fragile

  The present invention generally relates to an ultraviolet oven in which the precautions to be observed, as succinctly set forth above, are met in a particularly simple, economical and effective manner. More specifically, it relates to an ultraviolet ray furnace of the type comprising, in a chamber, a support adapted to receive a cbjètà treat and a source of ultraviolet rays disposed opposite said support, the furnace being characterized in that, according to a first aspect, it further comprises, permanently in said enclosure, a filter mounted movably between said support and said source of ultraviolet rays so as to be able to intercept cyclically the

  beam of ultraviolet rays emitted pair this one.

  In practice, the filter is rotatably mounted.

  At each work cycle, he performs a tour of

  rotation, during which, initially intercepting the

  ultraviolet light, it gradually unmasks this completely. The implementation of such a filter is thus, according to the invention, advantageously systematic, without intervention of

25141 16

  the operator; it is therefore advantageously perfect-

  controlled, and the operator is

  released during the oven working cycle.

  According to a second aspect of the invention, to such a fil-

  it is associated with a movable screen like itself between the support and the source of ultraviolet rays so as to

  ability to cyclically intercept the ultraviolet beam

violets issued by it.

  In practice, this screen is a simple metal screen.

  that, is rotatably mounted around the same axis of rotation-that the

  filter and, at the beginning of the cycle, is interposed between the

  carrying the object to be treated and the source of ultraviolet

  purples. Thus, the operator is spared from the radiation emitted by it when it enters the furnace chamber 1 '

object to be treated.

  From the beginning of the cycle, the screen unmasks the beam of

  ultraviolet ray, which is then

  core intercepted temporarily by the associated filter, which temporarily takes over from the screen,

  until complete release of said beam.

  Thus, the cycle of work required for cooking

  can the search be carried out on its own in a satisfactory way?

health and controlled.

  The features and advantages of the invention

  will also draw from the description that follows, as dl

  For example, with reference to the accompanying diagrammatic drawings in which FIG. 1 is a perspective view of an ultraviolet oven according to the invention; Figure 2 is, on a different scale, a partial elevational sectional view of this furnace, along the line II-II of Figure 1;

  FIG. 3 is a partial plan-section view, followed

  line III-III of Figure 2; Figure 4 is a larger scale, an axial sectional view of the furnace according to the invention, along the line IV-IV of Figure 3; FIGS. 5A, 5B and 5C are diagrammatic views which,

254 "4116

  3, illustrate a working cycle of the furnace according to the invention; Figure 6 is a view similar to that of Figure A for an alternative embodiment of the oven according to the invention.

  In general, and as illustrated in these

  the ultraviolet oven according to the invention

  door, in a chamber 10, a support 11 specific to the re-

  ception of an object to be treated, and a source of ultra-violet

  purple 12 disposed opposite said support.

  With regard, in practice, to the processing of plates 13,

  the support 11 is simply constituted, in the form of

  1, shown in the embodiment shown, the ultraviolet light source 12 is formed by a single lamp , lying parallel to the plate forming the support

  11, and arranged vertically in line with it.

  D will be referred to below as the general direction of

  mission from source 12 to the platen forming the

  port 11, perpendicular to it, as schematized in

  lines interrupted in Figure 2 and by a cross on the

gures 3 to 6.

  The enclosure 10 is formed in a box 15 which is

  runs down in base 16, and is closed towards

the top by a cover 18.

  The base 16 encloses in particular the organs necessary for serving the source of ultraviolet rays 12, such as a transformer and igniter, which are not visible in the figures, and on the front, it forms a panel 19 carrying various members 20 suitable for the control and the control of the oven, including lights. At the cover 18 is internally fixed the strip 22

  carrying the sockets 23 specific to the support of the lamp constituting

  killing the source of ultraviolet light 12.

  For the ventilation of the enclosure 10, the cover 18 is perforated by a gate 24, and, likewise, a gate 25 is

  at the base of this chamber 10, in the vicinity of the

-tine forming the support 11.

  In front, the enclosure 10 opens on the outside by a door 26, which, in the embodiment shown, is mounted vertically movable guillotine on side rails 27. An elastically deformable clip 28 is provided for holding in position high, and therefore open, this door 26, such a maintenance being provided by simple snapping under such a staple 28 of a rod 29 that has to this effect in

protrude door 26.

  Laterally, carry handles 30 are provided,

  and, at the base, can be provided cylinders specific to the con-

  tr Mle of horizontality (not visible in the figures).

  According to the invention, the ultraviolet light oven thus constituted further comprises, permanently in the enclosure 10, a filter 32 mounted movably between the support 11 and the source of

  ultraviolet radiation 12 so as to be able to intercept

  only the beam of ultraviolet rays emitted by it.

  In practice, this filter 32 is constituted by a simple glass plate carried by a yoke 33 in which it

is engaged by one of its edges.

  Anyway, this filter 32 is mounted to move in its plane and extends substantially transversely relative to

  to the general direction of issue D specified above.

  In the embodiment shown, the filter 32 implemented according to the invention is rotatably mounted during an axis A which, parallel to the general direction of emission D, is transversely away from it, such that said filter 32 intersects this general emission direction D only for a part of its circulation path about the axis A. The axis A of the filter 32 is shown schematically in broken lines in FIGS. 3, 5 and 6. In practice, in the embodiment shown, the yoke 33 forming the support of the filter 32 is simply engaged with gentle friction on a rotational drive member 35, and it is constituted by a sleeve set in rotation on the output shaft 36 of a geared motor 37 carried by a 1 -;

  stem 38 at the top of enclosure 10.

  In addition, according to the invention, the filter 30 is associated with

  a screen 38, a simple metal plate for example, which, like it, is mounted movably between the plate constituting the support 11 and the ultraviolet light source 12

  to be able to intercept cyclically the beam of ul-

traviolets issued by it.

  In the embodiment shown, the screen 38 is rotatably mounted around the same axis of rotation A as the filter 32, and is carried by the same drive member

in rotation 35 as this one.

  The sleeve constituting this training member in rotation

  tation extends cantilevered downwards from the

  36 of the geared motor 37 with which it is engaged, and,

  at its base, it has a threaded bore in which is.

  engaged to screw a screw 40 ensuring, through

  a washer 41, holding, against a shoulder 42 of the-

  said sleeve, the screen 38 and the yoke 33 carrying the thread

32, figure 4.

  Because this yoke 33 is engaged with gentle friction on the bushing constituting the rotational drive member, the filter 32 is adjustable anqulairement in position about its axis of rotation A.

  It may be the same for the screen 38.

  In a variant, the screen 38 can be rotated on

the socket in question.

  In any case, at the beginning of the cycle, and as

  diagrammatically in FIG. 3, the screen 38 is interposed between the plate constituting the support 11 and the source of

  ultraviolet radiation 12, and, by appropriate adjustment of its

  sition, the filter 32 is arranged in a way that is itself

  cepter: temporarily the beam of ultraviolet rays emitted

  by this source 12 as soon as the screen 38 unmasks the latter.

  In other words, the filter 32 is initially shifted by

  gularly in relation to screen 38, while being at least

  partially superimposed on it.

  Preferably, control means are associated with the geared motor 37 so that the drive member of the entire filter 32 and the screen 38 becomes one.

turn per work cycle.

  Such control means, which belong to the man of

  art, will not be described in detail here.

  They may for example comprise simple end-of-travel contacts, for stopping the power supply of the gear motor.

  37 as soon as the shaft 36 he commands has made a turn.

  Similarly, this power supply can be triggered by the door 27 when it is in the low position, or position

closure.

  Anyway, when the door 27 is in the high position, the screen 38 obscures the ultraviolet rays, so

  that the operator can safely put in place on the

port 1 l the plate 13 to treat.

  With the door 27 lowered, a cycle of

work commits itself.

  During this work cycle, which leads the assembly formed by the screen 38 and the filter 32 to make a turn of

  rotation about the axis of rotation A, the screen 38, initially

  interposed on ultraviolet radiation, Figure 5A, de-

  mask it, Figure 5 B, while, taking his relay, the filter 32 remains temporarily interposed on this radiation

  to moderate its intensity, before total liberation of that

  ci, figure 5 C. As it is easy to understand, by the form and / or

  the extent of the filter 32, as well as by the angular position

  initial angle thereof relative to its axis of rotation and therefore relative to the screen 38, it is possible to adjust in a desired manner the time during which such a filter 32 is effectively interposed on the ultraviolet radiation

during a work cycle.

  In particular, it is possible to lengthen or shorten

  this time by angularly removing from the screen 38 the

  filter 32 or bringing it closer to it.

  By way of example, in FIG. 6, the filter 32 has been

  angularly spaced initially from the screen 38, for an

  its length of intervention compared to the previous

  toothed. Such adjustment in-position of the filter 32 can be

done in the workshop.

  It may also be left to the discretion of the

  according to the treatment to be applied, and in particular

  depending on the nature of the polish to be cooked during this treatment.

  Of course, the present invention limits itself to

  their steps to the embodiment described and shown,

  but encompasses any variant of execution.

  In particular, it is not imperative that the filter and / or the screen used be rotatively mounted, such

  organs that can, on the contrary, both be mobile

lation.

  Similarly, it is not imperative that the source of

  ultraviolet light should be placed vertically in line with the

  support on which the object to be treated must be passed; au-con-

  milking it could as well be arranged horizontally

next to such a support.

  However, the arrangements described are preferred because they lead to particularly simple embodiments,

robust and efficient.

  Finally, the field of application of the invention is not limited

  mite not to the processing of plates but extends to that of any other objects, the support on which must be

  placed such an object then being eventually adapted accordingly.

accordingly.

Claims (9)

  1) An ultraviolet oven, of the type comprising, in a chamber (10), a support (11) suitable for receiving a   object to be treated and a source of ultraviolet rays (12)   placed facing said support (11), characterized in that it further comprises, in said enclosure (10), a filter (32) mounted movably between said support (11) and said   source of ultraviolet light (12) so as to be able to   cyclically collect the beam of ultraviolet rays emitted by this one.   2) Oven according to claim 1, characterized in that the filter (32) is movably mounted in its plane and extends   substantially transverse to the general direction   Emission spectrum (D) from the source of ultraviolet rays (12) to the support (11).   3) A furnace according to any one of claims 1,   2, characterized in that the filter (32) is rotatably mounted   turn of an axis (A) which, parallel to the general direction of emission (D) from the source of ultraviolet rays (12) to the support (11), is transversely away from this   direction (D) so that said filter (32) does not overlap   the latter only for part of his journey from around said axis (A).   4) Oven according to claim 3, characterized in that   that the filter (32) is angularly adjustable in position beyond turn of its axis of rotation (A).   Oven according to claim 4, characterized in that   the filter (32) or its support (33) is engaged to rub   gently on a rotating drive member (35).   Oven according to Claim 5, characterized in that the rotary drive member (35) of the filter (32) being   rotated on the output shaft (36) of a motorcycle   (37), control means are associated with said motor vehicle   gearbox (37) so that said drive member   in rotation (35) makes only one revolution per work cycle.   7) Oven according to any one of claims 1 to   6, characterized in that, to the filter (32), there is associated a screen (38) movably mounted as it between the support (11) and the   source of ultraviolet light (12) so as to be able to   cyclically collect the beam of ultraviolet rays emitted by this one.   8) Oven according to claims 3 and 7, taken   jointing, characterized in that the screen (38) is mounted   around the same axis of rotation (A) as the filter (32).   9) Oven according to claims 5 and 8, taken   jointing, characterized in that the screen (38) is carried by the same rotational driving member (35) as the filter (32).   10) Oven according to claims 6 and 9, taken   jointing, characterized in that, at the beginning of the cycle, the screen (38) is interposed between the support (11) and the ultraviolet light source (12), and the filter (32) is arranged in a manner itself temporarily intercept the beam of ultraviolet light emitted by it as soon as the screen (3-8) unmasks this last.