DD243982A1 - DEVICE FOR GENERATING THE MEASURING POWER FOR A MEASURING ELEMENT - Google Patents

Abstract

What is provided is a device for generating the measuring force for a measuring element, in particular for a small measuring machine. Due to its uncomplicated structure and its simple and fast operability, it facilitates the work of the measuring person during serial measurements. A mass piece (10) acts via a rod (9) on a part (6) that is easily rotatable in a basic body (1) and on a lever (5) via a stop (13). The lever (5) is connected to the measuring bolt (16) via a tensioned cable (3) with a scale body (2) guided in the basic body (1). In order to reverse the measuring force direction, the rod (9) with mass piece (10) can be tilted by at least 180 via a coupling (8) against a second stop (14). Fig. 1

Description

For this 2 pages drawings

Field of application of the invention

The invention finds application in length measuring devices, especially in length measuring devices for precision measurement at smaller measuring paths, with a constant measuring force is required, such as in a small measuring machine.

Characteristic of the known technical solutions

Known devices comparable with a small measuring machine consist in a simple form of a measuring stand in which a displacement sensor is used. The measuring force of these transducers is not constant because of the use of springs and the Meßkraftrichtung is not reversible.

Also known is a universal length measuring machine 828 Fa. Mahr. In a measuring head a probe is play and friction stored in a parallel spring joint. The measuring force is adjustable and the Meßkraftrichtung can be switched. Parallel spring joints have a strong Meßkraftanstieg so that only the smallest measuring paths with low Meßkraftanstieg reachable.

From DE-OS 2941 412 a measuring machine, in particular for length measurement is known.

At this measuring machine a Meßsch.litten mitincrementalen scale by hand or by means of gear motor is displaced. In the first case very different measuring forces are possible, whereby no precision measurements are feasible. In the second case, a constant measuring force can be achieved over the entire measuring range via a motor control.

In the publication no. 24-292 a-1 a universal length meter is described, in which a photoelectrically operating Abbe measuring element is used. A constant measuring force in the entire measuring range of 100mm is achieved by two suspended weight trains.

As a disadvantage of this solution is cumbersome handling of the swing-over weight trains to see. In addition, additional weights are required for the change of the measuring force.

Object of the invention

The aim of the invention is to provide a simply constructed and easy-to-use device for generating the Meßkraftfürein measuring element.

Essence of the invention

The invention solves the problem of providing a device according to the preamble of the first claim, - in which the Meßkraftrichtung is switchable without weight trains must be umgehängt and over the entire measuring range sufficiently constant and adjustable measuring force is realized. This object is achieved in that on a base body in a known manner, a shaft is mounted friction, on which a lever is attached to the outer end of a rope is fixed, which is connected to both the first and the second end of a scale body taut and in that a cylindrical part with a rotary knob is rotatably mounted in the shaft via a coupling and that a rod with displaceable mass is fastened to the part at right angles to its axis of rotation, and two stops are firmly attached to the main body, at which the lever is in each case at the measuring end of the Rests scale body, and are firmly attached to the lever Anschlge-ge and the rod in Meßkraftrichtung to the right constantly at the stop and in Meßkraftrichtung to the left constantly abuts the stop, or the rod is attached by means of a clamp adjustable on the part. A mass piece acts via a rod on a part which is easily rotatable in a basic body and via a stop on a lever. This lever is connected via a tensioned cable with a straight body in the main body scale body. The scale body with measuring pin can be moved back over a lifting lever against the applied in this way and in the measuring range of 30 mm fairly constant measuring force. To reverse the Meßkraftrichtung the rod with mass piece is tilted by at least 180 ° via a coupling against a second stop, so that the lever acts on the scale body on the rope in the opposite direction with a constant measuring force as in the previously described position of the rod.

embodiment

Reference to the drawing, the invention will be explained in more detail

 The individual figures show:

FIG. 1: side view of the measuring force device on the measuring element

Figure 2: top view of the measuring element with a partial section through the Meßkraftvorrichtung

In Figure 1, a mass piece 10 is slidably mounted on a rod 9 in the direction of the arrow X and clamped in any position. The rod 9 is connected at right angles to the axis of rotation of a cylindrical part 6 fixed thereto.

As shown in FIG. 2, the part 6 is connected to a shaft 4 via a coupling 8, for example a friction clutch. The shaft 4 is rotatably mounted in a Grundkör by 1 friction. On the shaft 4, a lever 5 is fixedly mounted on the front side, protruding from the main body 1. Substantially perpendicular to the axis of rotation of the shaft 4, two guide rails 15 are mounted parallel to each other on the base body 1. Between the two guide rails 15, a scale body 2 with a measuring pin 16 is guided precisely and with low friction. Between the two ends of the scale body 2, a cable 3 is tensioned, which is firmly connected to the outer end of the lever 5. On the lever 5, two stops 13,14für the rod 9 are mounted on the base body 1 and there are two stops 11,12 for the lever 5. A knob 7 is mounted on the part 6. At the right end of the scale body 2, a lifting lever 17 protrudes. At the opposite end of the scale body 2, a micrometer 18 is articulated.

In the position shown in Figure 1 (solid lines) pushes the mass piece 10 on the rod 9 on the stopper 13. This causes the lever 5 is pressed to the right against the stop 11 and the rope 3, the scale body 2 with the measuring pin sixteenth placed in his extreme right position. The weight of the mass piece 10 acts on the measuring pin 16 in accordance with the lever ratio set on the rod 9 as a measuring force.

If the spindle of the micrometer 18 is screwed to the left in the direction of the arrow Y1, the measuring pin 16 can be pushed back via the lifting lever 17 in the direction of the arrow Y2 in order to insert a test object can.

This can take place along the entire measuring path as long as moved over the cable 3, the lever 5 abuts against the stop 12.

In this case, the mass piece 10 moves along the arrow Z in the dashed line position in Figure 1. The entrainment is carried out by the stop 13. As a measuring force acts the vertical weight component of the mass piece 10. Their change by the movement of the mass piece 10 on a circular path is in entire measuring range of, for example, 30mm negligible.

The measuring force is adjustable between 0.2 ... 1 N and only fluctuates by 10%.

To reverse the Meßkraftrichtung can be further tilted by turning the knob 7, the rod 9 from the above-described dashed line position in Figure 1 under the action of the clutch 8 until it rests against the stop 14.

This position is shown in dashed lines on the left side in FIG. About the stop 14 while the lever 5 is printed against the stop 12 and the measuring pin 16 placed in its extreme left position. With the lifting lever 17, the measuring pin 16 against the measuring force, against the arrows Y are moved. With this Meßkraftrichtung internal measurements are possible.

If you do not fix the rod 9, but rather adjustably via a clamp (not shown), the measuring element can also be operated vertically.

As advantages of the solution according to the invention are her first uncomplicated and space-saving design to see. Furthermore, the device provides a constant and easy to adjust bare measuring force and the Meßkraftrichtung is fast and easily switchable.

Claims (4)

Invention claim: 1. A device for generating the Meßkraftfürein measuring element by means of mass in the same body (1 is langordnet, in which a scale body (2) is straight and connected via a cable (3) with the scale body (2), characterized in that a shaft (4) is mounted in a low-friction manner in the base body (1), to which a lever (5) is attached, at the outer end of which a cable (3) is fastened to both the first and the second end of the scale body ( 2) is tightly connected and that in the shaft (4) a cylindrical part (6) with a knob (7) via a coupling (8) is rotatably mounted and that at the part (6) perpendicular to a rotation axis, a rod (9) with sliding mass piece (10) is attached. 2. Device according to item 1, characterized in that on the base body (1) has two stops (11,12) are fixed, against which the lever (5) in each case at the measuring range end of the scale body (2). , 3. Device according to item 2, characterized in that on the lever (5) stops (13,14) are fixedly mounted and the rod (9) in Meßkraftrichtung to the right constantly on the stop (13) and in Meßkraftrichtung to the left at the stop ( 14) is applied. 4. The device according to item 2, characterized in that the rod (9) by means of a clamp adjustable on the part (6) is mounted.