DE1513348A1 - Contact sensor for several sensitivity levels - Google Patents

Description

P 15 Ό 348.9 ^ Atf ₂ o. April .196c

Maschinenfabrik Heid Aktiengesellschaft Vienna (Austria)

Contact sensor for several sensitivity levels

The invention relates to contact sensors for several sensitivity levels for scanning copy templates and copy models on post-forming machine tools. For post-forming workpieces are often electrical contact sensors that use amplifier elements (Relays, thyratrons, transistors) the corresponding actuators, mostly electromagnetic Clutches or electromagnetic valves switch, in use.

These known contact sensors consist essentially of a combination of levers on which the Contacts are arranged, which are closed or opened in a certain sequence with increasing sensor deflection will. When processing workpieces in the copy process

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it is necessary to adapt the sensitivity of the sensor to the operating conditions.

The most important specific factors for sensor sensitivity are: copy feed speed, switch-on and switch-off dead times of the actuators, susceptibility of machine tools to vibration, etc. If you put value For the greatest possible accuracy of the workpieces to be manufactured, one must trust that the sensor contacts are closed in this way adjust so that the sensor sensitivity approximates the maximum value given by the operating conditions reached, but not exceeded.

If this is exceeded, the control circuit formed by the sensor and machine tool would be overridden and the machine will begin to oscillate. The adjustment of the contacts is time consuming and for the operator the machine tool is often difficult to carry out because several contacts are always adjusted in a certain way Need to become.

For this reason, sensors have been built that allow the leverage between the feeler pin and the contact system and thus also the sensor sensitivity during the

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To change operation by actuating a single adjusting screw or the like. A disadvantage these versions consists in the fact that this requires a considerable amount of levers and other mechanical elements, and consequently the undesired bearing clearances and elastic deformations within the sensor are also increased. Even is the contact pressure of the sensor tip on the template If the sensor is set to be sensitive, due to the increased reaction of the contact forces due to the greater leverage, it is higher than for the insensitive, adjusted sensor · However, this does not correspond to the requirements in practice, the low system pressure calls for great sensitivity.

There are also designs known in which in one Two complete contact lever systems are installed, one of which has high sensitivity for sensors finishing, the other is set to low sensitivity for roughing, either one or the other system can be selected by a switch. For this version there is one per sensitivity level complete lever system with a set of contact pairs

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necessary · The disadvantage here too is the double expenditure on mechanical parts with only two selectable, extreme sensitivity settings call · There are two pairs of levers arranged one above the other in this known control and, if you use the AftZdhl «ier wanted to increase sensitivity levels, one would have to arrange further pairs of levers over it, whereby the overall height of the sensor in one for sensor controls would be enlarged to an impermissible extent.

The invention consists in that in a contact 'sensor for several sensitivity levels with one axially movable plunger that closes and opens adjustable pairs of contacts for switching the Actuators of post-forming machine tools controls, according to the invention, the contact pairs from one another The same contact spring assemblies each have a pair of superimposed contacts, the contact spring assemblies are inserted in a housing on the side of the plunger and are insulated from outside the housing accessible set screws are adjustable, and the The plunger has approaches for actuating the pairs of contacts' · This configuration ensures that a plurality of contacts can be accommodated in the smallest possible space, in groups for different

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Sensitivity levels of the sensor can be switched can, with a contact pair without changing its adjustment in several sensitivity levels can be used and can trigger different functions. The contact spring assemblies are useful arranged in several planes lying one above the other perpendicular to the ram axis and are made up of several approaches of the plunger can be actuated. The contacts of the contact spring assemblies can be adjusted so that the distances

Work point to work point form a geometric series. This allows with a minimal number of contact pairs achieve a maximum number of sensitivity levels.

For example, twelve contact pairs in geometric progression with a step factor of 1.26 result in six Sensitivity levels.

An embodiment of the invention is shown in section in the drawing. The probe rod 2, which is movable about an axially displaceable ball joint 1, can be moved in all directions by the probe pin 3 firmly connected to it. This movement is caused by a ball k on one in the axial direction,

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for example, a plunger 6 guided by a ball guide 5
transfer. A spring 8 pushes the plunger 6 and thus also the FUhleretange 2 back into their rest position. On each carrier 9 are each made of one
Contact pair 10, il, 12, 13 fixed existing contact spring packs isolated. As the drawing shows, the contact spring assemblies are essentially in two planes perpendicular to the plunger axis
Plunger 6 arranged radially. The active spring of this
Contact spring assemblies can be actuated by the disk-shaped projections 7 of the plunger 6. For this purpose, the active springs are advantageously provided with an actuating nipple made of insulating material. With
With the help of the set screw Ik built into a resilient element, the contact spring assembly can be roughly adjusted and the fine adjustment can be carried out from the outside using the set screw 15. The contacts can be designed both as closing contacts (left half of the figure) and as opening contacts (right half of the figure).

By means of an electrical switching device, those contacts can be selected in groups that are required for have the desired sensitivity level favorable setting of the operating points.

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Claims (2)

«Ti r * tr patent claims: 1. Contact sensor for several sensitivity levels with an axially movable plunger that closes and opens adjustable pairs of contacts for switching the actuators of post-forming tool machines controls, characterized in that the contact pairs of mutually identical contact spring assemblies with there is a pair of contacts lying one above the other, the contact spring packs on the side of the plunger Insulated inserted into a housing and by adjusting screws accessible from outside the housing are adjustable, and the plunger has lugs for actuating the contact pairs. 2. Contact sensor according to claim i, characterized in that the contact spring packets in several one above the other planes lying perpendicular to the ram axis are arranged and can be actuated by several approaches of the ram, 3 · Contact sensor according to claim 1 or 2, characterized in that the contacts of the contact spring assemblies are - 8 -909884/0054 art are adjusted so that the distances from working point to working point form a geometric series, 009884/0054