DE8108328U1 - CENTERING DEVICE WITH MEASURING AND SWITCHING DEVICE FOR THE DEPTH OF THE PLATE IN THE CLAMPING HEADS OF A TEMPERATURE STRETCHER - Google Patents

Description

PATENTANWÄLTE FW HEMMERICH · g £ rO MOLL & ä '·>Ö.'ÖROSGt · F *! POLLMEIER U-

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March 19, 1981 - 1 - 82 794 pr.kö

Centering device with measuring and switching device for the depth of immersion of the sheet in the clamping heads of a sheet metal

Streckers

State of the art

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To obtain too much waste when stretching sheet metal, the depth of immersion of the sheet metal in the clamping jaws is kept as small as possible (see FIGS. 1 and 2). Permanently installed or exchangeable stops in the clamping jaws of the clamping heads are usually used for this purpose. The geometry and mode of operation of the clamping jaws require smaller immersion depths with decreasing sheet thicknesses. The fastening and especially the replacement of stops in the clamping jaw is on the one hand time-consuming because of the fastening options and the large number of stops required and on the other hand because of the poor accessibility. Therefore, in practice usually the insertion of the sheet is observed in the clamping head by an operator, who informed by show of hands the helmsman. First

PATENT LAWYERS F.W. HEMMERICH · QERp MÜLLER * ··. D * JiROSSE * F. JPOLLMEIER

March 19, 1981 - 2 - 82 794 pr.kö

this process is time-consuming and, secondly, the immersion depth is imprecise. The need to have a husband is also very disadvantageous to have to climb into the Strecker. '

Task;

One possibility is to realize the clamping process as automatically as possible without the help of an observer to let-; ·: ■

Description of the solution to the task Pictorial representations:

Fig. 1 clamping jaw in section with thick sheet metal Fig. 2 clamping jaw in section with thin sheet metal Fig. 3 horizontal section through the clamping jaw with

Centering device work phase insertion Fig. 4 Horizontal section through the clamping jaw with

Centering device work phase "clamping the

middle "jaws" Fig. 5 "" work phase "tensioning the

remaining "jaws

Fig. 6 centering device in the view. Fig. 7 section through the measuring device 8 a section through the measuring device II-I

PATENT LAWYERS F.W. HEMMERICH · -GERO ^ üLL; E'R; - 'd' (BRO & 'E: · fj

'. POLLMEIER

March 19, 1981 - 3 - 82 794 pr.kö

The measuring device is suitable for all stretchers who have centering devices 2 on the clamping heads 1, which with Centering arms 3, 4 are equipped. One or both centering troughs (3 or 3 and 4) are equipped with a measuring device which essentially consists of the following parts:

A guide rod 5 with built-in, double-acting Q sliding cylinder 6 and an outer splined shaft profile or some other form that prevents rotation and is fastened in the guide arm 3 or 3 and 4,

a driver 7 , which is guided on the guide rod 5 and at the end of which the piston rod 8 of the displacement cylinder is attached, and a measuring unit 9 which is attached to a bracket 10 welded to the centering arm 3 or 3 and 4. In tab .10 a Helle 11 is stored, at one end of which a cable drum 12 is placed and the other end through a sleeve 13 in which a torsion spring 14 is mounted so that

they apply torque to the Helle 11 over the required stroke Exercises a corresponding number of revolutions, is guided and with the brightness of a potentiometer attached to the sleeve 13 15 is connected. A cable 16, which is fastened to a cam 17 of the driver 5, is wound around the cable drum 12. The position of the driver is thus always grasped by the potentiometer ««.

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PATENTANWÄLTE FW HEMMERICH · kEÄD'täüLLfcR * · D..ÖROSSE "· f! POLLMEIER rf

••••••• 111 j /

^fc March 19, 1981 - 4 - 82 794 pr.kö

With the help of this device, the Einspannvor can gang such as will run automatically:

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1. Insert the sheet to be stretched 18 and initiate the clamping process at the control panel.

|; ζ ~) 2. Command "Center sheet metal", "Close clamping jaws of the" I stretching clamping head "and" Clamping jaws

I of the counter-clamping head open "

3. Message "Clamping jaws of the opposing clamping head open" "Clamping jaws of the stretching clamping head closed", "Sheet centered" and "All drivers 7 in starting position" catch up.

I 4th command "move stretching head forward", d. H. Sheet . 'Push into the counter-clamping head.

5. Message "Sheet position only counter-clamping head reached"

wait.

6. "Stop stretching head" command

7. Command "medium clamping jaws in the counter-clamping head ; conclude".

8. Wait for the message "Middle clamping jaws in the counter-clamping head '. Closed".

9. Command "Open clamping jaws in the stretching clamping head".

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. PATENT ATTORNEYS FW, HEMME RICH · GERD MULUJr ""d'Prosse · ^P: POLLMEIER March 19, 1981 - 5-82794 pr.kö

10. Message "Clamping jaws in the stretching chuck opened".

11. "Move stretching head forward" command, d. H. sheet Push into the stretch chuck.

12. Message "Sheet position in stretch clamping head reached" wait.

13. "Stop stretching head" command.

C 14th command "middle jaws of the stretching clamping head conclude".

15. Message "middle jaws in the stretching chuck closed" wait.

16. Command "Unload cylinder 6 of the measuring devices".

17. Wait for the message "Cylinder 6 of the measuring devices unloaded".

18. Command "Move centering arms apart" and "All carriers 5 in starting position".

- 19 '. Wait for the message "Centering arms moved apart".

20. Command "Close remaining clamping jaws involved in clamping the sheet".

21. Wait for the message "all clamping jaws involved in clamping the sheet metal closed".

This ends the clamping process and the stretching process can be initiated.

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PATENTANWÄLTE F.W, HEMMERICH · GE ^ DtJuLLfR j D. £ ROS§f ·. F'POLLMEIER

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March 19, 1981 - 6 - 82 794 pr.kö

The work phases nos. 19 and 20 are due to the fact that the clamping jaws, in the area of which the drivers are still located, cannot be closed, because they have the space of the occupy the full jaw opening (see Fig. 9).

It should also be pointed out that if commands no. 6 or 13 are not followed, the drivers * are not damaged, O because they are pushed against the base 19 of the clamping head jaws and are safely supported there with their head surfaces 20 (FIG. 7).

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Claims (4)

1. Centering device with measuring and switching device for Immersion depth of the sheet in the clamping heads of a sheet stretcher with centering arms that are horizontally at right angles are displaceable synchronously in opposite directions to the stretching direction, characterized in that one (3) or both of each clamping head Centering arms has a driver which can be displaced in the stretching direction and which is arranged displaceably on a guide rod 5 and via transmission elements 17, 16, 12 and 11 with a Meter 15 is connected. 2. centering device according to claim 1, characterized in that a double-acting cylinder 6 is arranged in the guide rod 5, the piston rod 8 of which is connected to the driver 7. PATENT LAWYERS F.W. HEMMERICH · GEffD MöbLÖR j D. ÜROSSS. · F.2POLLMEIER March 19, 1981 - 8 - 82 794 pr.kö 3. centering device according to claim 1 to 3, characterized; that as transmission elements for the Carrying movement, a pull cable 16 is provided, which on the one hand is mounted on a cable drum 12, which is mounted on the centering arm 3, 4 whose light 11 is biased by a torsion spring 14 and connected to the light of a potentiometer 15, wound is. 4. centering device according to claim 1 and 2, characterized in that the head surfaces 20 of the driver in the extended position the base 19 of the clamping jaws touch the clamping head.