FR2529825A1 - INSTALLATION FOR FORMING PLATES OR PORTIONS OF SHEETS IN THERMOPLASTIC SYNTHETIC MATERIAL - Google Patents

Abstract

A.INSTALLATION FOR FORMING PLATES OR PORTIONS OF SHEETS IN THERMOPLASTIC SYNTHETIC MATERIAL. B. INSTALLATION CHARACTERIZED IN THAT IT INCLUDES, IN THE AREA OF THE HEATING STATION, OR OF A COMBINED HEATING AND LOADING STATION OF THE TIGHTENING RODS 24, 26 CONNECTED TO THE PLATE SUPPORT CHASSIS OR TO THE TRANSPORT MEANS AND EXTENDING TRANSVERSALLY TO THE DIRECTION OF TRAVERSE, LITEAUX BETWEEN THE EDGE OF PLATE 16 IS IMMOBILIZED DURING HEATING, AT LEAST ONE OF THESE LITEALS 24, 26 BEING PIVOTED. C. THE INVENTION APPLIES TO PLATE FORMING OF THERMOPLASTIC MATERIAL.

Description

1.- "Installation for forming plates or portions of

  sheets of thermoplastic synthetic material ".

  The present invention relates to an installation

  for forming plates or portions of sheets

  made of thermoplastic synthetic material by different pressure

  In addition, this machine comprises a forming station, a loading station, a heating station, a means of transport which interconnects the various stations, and a plate feed device which can take the plates from a single station. stack and introduce them

  in the means of transport, and / or a sampling device

  roller mounting with cross-cutting device

  for a rolled sheet.

  An installation of this type is known from the utility model DE-GM 80 05 873 In the plant shown, there is provided in the forming station, a heater that heats the plate or the portion of the sheet

  up to the forming temperature.

  addition, in the loading station, a preheating

  lable which is already heating up the plate at lower temperatures.

  below the forming temperature in order to reduce the cycle time A single reheat in the station

  loading up to the forming temperature is, however,

  not possible because the plate would then roll

  these two lateral edges not held.

  Another document DE-GM 73 01 715 discloses an installation in which, in a heating station mounted upstream of the forming station, the plates are reheated at a temperature of

  In order to avoid winding the edges, the

  that is then maintained all around its circumference, the heating means disposed on the lower side of the plate,

  being mounted on a frame in a height adjustable manner.

  The disadvantage of this embodiment is that the heating carrier frame and the plate support counterframe are parts of a given size which must be interchanged at the same time.

  converting the device to another plate format.

  Another disadvantage is that between the

  In the case of the heating system and the plastic plate to be formed, there is a relatively large intermediate space which must be crossed by the support frames, since the infra-red rays generally used require a certain spacing from the plate, so that

  is ensured a uniform reheating of it.

  The reheating process is made difficult by the large frames that have to be moved in two directions. Another problem is raised by the fact that the lower frame which is associated with the heating is

  strongly heated, which causes additional heating

  undesirable effect of the edge of the plate.

  the object of the present invention is to provide an installation such as the final reheating of a

  plate, or a portion of a leaf cut from a ban-

  of synthetic material, can be carried out outside-

  at the forming station, without the edges being

  heated, without the imposition of

  necessary, and without the heating being made difficult

  and expensive by these facilities In particular, the

  clamping the plates must allow the station to

  heating and loading station can be grouped together

  at a single station, which preserves the advantages of a more compact and shorter construction method. For this purpose, the subject of the invention is a machine of the type described at the beginning, characterized in that it comprises, in the zone of the heating station, or of a combined heating and loading station, clamping strips connected to the plate support frame or

  means of transport and extending transversely across the

  traversing recess, battens between which the edge of the plate is immobilized during heating, at least

  one of these battens being pivotally mounted.

  Other advantageous embodiments

  from the following description of a conforming machine

  to the invention, with reference to the accompanying drawings in which:

  FIG. 1 is a front elevational view of

tale of the machine,

  FIG. 2 is a longitudinal sectional view

  dinal through the loading station and the heating station,

  FIG. 3 is a cross sectional view of

similar to Figure 2.

  The machine as a whole in FIG. 1 comprises the forming station 1, the station

  2 and, if applicable, a device for

  Roller port 3 The forming station 1 is constituted in a manner analogous to that of a press forming machine.

  known plates It comprises a movable table in height

  4 to receive a form or mold 5, a stationary frame 6 of a plate support, a mobile frame 7 and, where appropriate,

  an auxiliary body of extension 8 In the

  Combination 2 and heating, there is arranged a lifting device which is constituted by a 4-drive 10, transverse bars 11 provided with suction cups 12 (Figure 3) These can be temporarily connected with a source With this lifting device, each top plate of a stack of plates 13 can be grasped and lifted. In the heating and charging station 2 is further provided a heating device 14 which can

  to be moved horizontally A second heating device

  fage can be provided when needed.

  Between the heating and charging station-

  2 and the forming station 1 extends a device for

  transport 15 operating according pace, which consist

  two conveyor chains 17 which grip the

  than 16 by its opposite side edges and flowing in

  18, driven by a motor 19 (FIG.

  gure 3) On the lower side of the guides 18 are mounted, in the heating and loading station, battens

  collapsible clamps 20 (FIG. 3) which can be pivotally

  voted by trainings (not shown) of such

  That a gripping plate 16 can be raised In the forming station 1, sônt then provided contre-clams

  21 fixed by screwing instead of the folding battens.

20.

  With a view to clamping and blocking, during the heating of a plate 16 which has been put in place in the heating and loading station 2, also on its transverse lateral edges, and thus to oppose a possible winding of the edges, there is provided a clamping device and blocking which is constituted, as shown, by a ch seated 22, but which could as well be fixed on the guides 18 This device comprises two beams

  23, extending transversely to the direction of movement

  cement and to which are fixed rigidly

  These beams bear, to their ex-

  lower end, for example, cooling hoses

5.-

  25, which are connected to a fluid supply of

  cold, and which extend downward to

  Sheet of the sheet The counter battens 26 oppo-

  are rotatable around the center of rotation 27 (FIG. 2), which is formed by a shaft 28 supported in

  bearings 29 on the beam 23 On this shaft 28 is

  Also, a gear wheel 30 with which meshes

  a rack 31 which is moved by a hydraulic cylinder

  32 This cylinder 32 is also connected to the beam

  23 In their rotated state towards the hau_ the service battens

  rabies 26 are below the plane of sheet 9 of

  in such a way that its transport is not

  presented in dot-dashes in the fignoe 2), With the device described and shown it is possible to treat plates of different sizes after a change of equipment appropriate Adaptation

  necessary in the transverse direction of a man-

  known per se, by reconciliation or removal

  In view of not having to proceed, on the clamping flanges 24 269 to an adaptation for

  each platelet width (which of course would be

  while possible), these battens are provided shorter than a specific leaf width, as this is sufficient in most cases It is then possible to always bring the guide rails 18 by an equal amount

at 2 A.

  With a view to adapting to the lon-

  plate in the direction of crossing the

  tif, the beams 23 are connected to the frame 22 in a manner

  They can be offset in the direction of the traverse. The clamping members and the elongated holes can then be provided in one of the parts. Of course, it would also be possible to fix the beams 23 on the guides 18, in such a way that appropriate so that a lateral shift of the guides 18 is possible by 6.-

  simple loosening of locking screws.

  In the case of very large margins of

  must be covered by the device, the transport

  must therefore be adjustable in transverse

  It is then possible to hold in reserve two or three sets Lx of clamping battens 24, 26, which can be interchanged, possibly with battens of

  the largest width corresponding to the width of

than the weakest.

  In the example shown, the heating and loading stations are combined, which can be

  lecas povu) reasons of saving space and expense.

  Of course, the accommodation station can also be

  upstream of the heating station, which may

  Feel advantages in the case of exchange stores

for stacks of plates.

  In the case, it must be possible to

  yield with the rolls of plastic film winding which is advantageous especially for very thin sheets is provided a device

  6-rim Lex-3 receptor where the sheet strip 3 is

  pulled, then cut into sheets by the transverse knife

  can then be transported and treated as a sim-

full plate.

  The installation according to the invention

  As follows: A plate 16 is separated and lifted from a stack of plates 9 by the sampling device 9 and

  it is introduced into the transport device 15.

  In another case, a portion of the web strip 33 is removed from the roll 34, and then separated and transported to the heating and loading station 2. The two clamping battens 26 are pivoted to the plate 16, or the web piece of leaf, are now immobilized

  transversely between the clamping flanges and longitudinal

  7.- nally in the conveyor device 15 Heating

  14 acts above the plate and carries it to the tem-

forming temperature.

  It is then transported to the forming station 1 where it is immobilized and shaped, in a manner known per se, by means of the form 5 and by differential pressure, by vacuum or by compressed air. the forming of a plate, the following plate 16 is heated so that, after demolding of the finished part 3, it may itself be subjected to forming,

without waiting time.

8 e-

R E V E N D I C A X I 0 N S

Claims (5)

CLAIM 85   1 i. Apparatus for forming plates or portions of sheet of thermoplastic synthetic material by differential pressure, comprising a forming station, a loading station, a   heating station, a means of transport which connects   they are the different stations, as well as a plate feed device which can take the plates from a stack and introduce them into the means of transport, and / or a roller sampling device with a cross-cutting device for a rolled sheet rolled up characterized in that it comprises, in the area of the heating station, or of a combined heating and loading station, clamping strips (24, 26) connected to the plate ratio frame or transport means and extends transversely to the traversing direction, battens between which the edge of the plate (16) is immobilized during heating, at least one of these   battens (24, 26) being pivotally mounted.   2 Installation according to claim 1, characterized in that the two clamping strips (24, 26) are fixed to a single beam (23), and one of them (26) can be pivoted sufficiently so that, at open state, it lies entirely above the plane of the room (16) without hindering its transport.   3. Installation according to one of the   cations 1 or 2, characterized in that one of the battens clamping device (24, 26) is cooled.   4. Installation according to any of the   Claims 1 to 3, characterized in that the length   battens (24, 26) is smaller than the width of the plate (16) to be immobilized.   5. Device according to any one of   Claims 1 to 4, characterized in that the moving   of pivoting of the clamping strip (26) is effected by means of a rack (31) and a toothed wheel (430) through which the batten (26) is connected to a   shaft (28) supported on the beam (23).