DE4330135A1 - Device for displaying a desired position which has been reached by electrically conductive workpieces at stops, in particular on roller tracks (roller conveyors) - Google Patents

Abstract

When guiding workpieces up to stops, the following problems can arise: - the workpiece rebounds from the stop. - a damping spring remains tensioned. - the stop is displaced by an excessively strong impact. In order to indicate that none of these problems which lead to positional errors has occurred, an electrical display is connected on the one hand, via a current source, to the roller track and the metallic workpiece located thereupon, and on the other hand to a switching contact which is located on a base body. This switching contact is connected via a cable to a contact a, which is fastened rigidly in the longitudinal direction to the base body and has pressed against it by a spring a contact b which is connected in an electrically conductive and mechanically firm fashion to a stop plate. The contact a, contact b and stop plate are arranged in a fashion electrically insulated from the base body.

Description

b) Field of application of the invention

The invention relates to an electrical display device for Measuring stops, especially for positioning metallic Transport goods on roller conveyors.

c) Characteristic of the known technical solutions

There are already many types of measuring stops for positioning especially of metal beams lying on roller conveyors for Cutting or known for further processing. These usually work as follows:

A measuring stop is by hand or by an electric motor on the corresponding target dimension set. Then the metal carrier is hand or over a electric runway drive pushed against the measuring stop. The measuring stop must now be designed so that it, without itself to be moved, absorbs all impact forces. This is either due to very heavy or springy Measurement stops realized. With driven roller conveyors, too reducing the drive speed by means of pre-switches known.

However, all of these measurement stops come with a number of Disadvantages. The main disadvantage is that the Transport goods through the backlash when struck by the spring back in the measuring stop and so that it no longer lies against the stop plate. This will often the straps are too short. With resilient measuring stops also occur that the damping spring does not come back springs back completely and the straps become too long can.

Is the impact of the transported goods so strong that the clamping force the measuring stop is overcome, it can be moved be what with manually adjustable measuring stops without digital display is difficult to recognize. This mistake leads to long straps again.

d) Object of the invention

It is therefore an object of the invention to build a system in only then an optical or acoustic display signals when all three conditions are met:

• - The beam actually lies against the stop plate
• - An existing damping spring has springed back again
• - The manually adjustable stop was affected by the impact of the Carrier not moved.

e) nature of the invention

This is essentially achieved in that a electrical display on the one hand via a power source with the  Roller conveyor and the metal workpiece on it, on the other hand is connected to a switch contact that is on a base body, this switch contact via a Cable with a rigid in the longitudinal direction on the base body attached contact a, against which is connected by a spring a contact b is pressed, which is electrically conductive and is mechanically fixed to a stop plate and wherein Contact a, contact b and the stop plate against the base body are arranged electrically insulated.

f) embodiment

The invention will now be described in more detail using an exemplary embodiment to be discribed.

A system representation is ideally suited for this.

A base body 3, which is displaceably arranged on a running rail 1 with a measuring scale 2 fastened thereon, carries an inner part 5 fastened to a bracket 4 , in which a guide block 6 is rigidly fastened. This guide block 6 has a bore through which a guide tube 7 can be easily moved. An electrically insulated contact a8 is fastened to the guide block 6 in such a way that it can abut against a contact b9, which is also attached to an adjusting ring 10 fastened to the guide tube 7 in an electrically insulated manner. The guide tube 7 carries on its front side a support plate 11 with an outer part 12 , to which the actual stop plate 14 is fastened via an insulating plate 13 . If a spring 14 is now attached between the support plate 11 and the guide block 6 , an electrical connection is established between contact a8 and contact b9 by its spring force. In addition, an electrical connection between the stop plate 14 and the contact b9 is generated by a cable which is located in the guide tube 7 . Another cable is led from contact a8 to a switch contact 15 . This switching contact 15 is closed as long as a pressure piece 16 , which is likewise arranged on the running rail 1, presses on the plunger of the switching contact 15 . A cable now leads from the switching contact 15 to a display 17 , the second connection of which is connected to a current source 18 . The second pole of the current source 18 is connected to the roller conveyor 19 via the base body 3 and the running rail 1 . If an electrically conductive workpiece 20 is now pushed on the roller conveyor 19 against the stop plate 14 , the display 17 lights up. If the impact is too strong and the spring 14 is compressed, the electrical connection between contact a8 and contact b9 is interrupted at the same time and the display 17 goes out again. Since the spring 14 has a certain pretension, it strives to push the workpiece 20 lying on the roller conveyor 19 back until contact a8 is again applied to contact b9. If the impact of the workpiece 20 was so strong that the base body 3 clamped on the running rail 1 was displaced, the plunger of the switch contact 15 is no longer pressed and the switch contact 15 is open.

This completes the task and the indicator light only lights up when all three conditions are met.

Reference list

1 track
2 measuring scale
3 basic bodies
4 outriggers
5 inner part
6 guide blocks
7 guide tube
8 Contact a
9 contact b
10 collar
11 support plate
12 outer part
13 insulating plate
14 stop plate
15 switching contact
16 pressure piece
17 display
18 power source
19 roller conveyor
20 workpiece

Claims (3)

1. Arrangement for displaying an achieved target position of electrically conductive workpieces at stops, in particular on roller conveyors, characterized in that an electrical display ( 17 ) on the one hand via a power source ( 18 ) with the roller conveyor ( 19 ) and the metallic workpiece ( 20th) ), on the other hand, is connected to a switch contact ( 15 ) which is located on a base body ( 3 ), this switch contact ( 15 ) being connected via a cable to a contact (a8) rigidly attached to the base body ( 3 ) in the longitudinal direction, against which a contact (b9) is pressed by a spring, which is connected in an electrically conductive and mechanically fixed manner to a stop plate ( 14 ) and wherein contact (a8), contact (b9) and the stop plate ( 14 ) against the base body ( 3 ) are arranged electrically insulated. 2. Arrangement for displaying a target position reached according to claim 1, characterized in that the base body ( 3 ) on a running rail ( 1 ) is arranged in the longitudinal direction and can be clamped there and on the same running rail ( 1 ) a pressure piece ( 16 ) can be clamped, which closes the switching contact ( 15 ) attached to the base body ( 3 ) via a mechanical transmission element. 3. Arrangement for displaying a target position reached after Claims 1 and 2, characterized in that the electrical Switching elements used both in combination and individually can be.