DE74051C - Automatic button device for machine tools with support - Google Patents

Description

IMPERIAL

PATENT OFFICE.

CLASS 42: Instruments.

The self-active probe apparatus for machine tools with support of the main patent is in its self-acting effect of which, that an approach \ of certain mefsbaren caliber is present at the object to be processed, the MAFS of Weiterabdrehens or width outside drilling is determined by its diameter. For this purpose, the apparatus is then set so that, after the rotation is complete, the pointer c is at the zero point of the scale. This starting from. An initial diameter has the disadvantage, especially in mass production, that a measurement has to take place every time the turning begins, which causes a loss of time. Furthermore, the accuracy of the later turning depends on the accuracy of the measurement of the initial caliber.

Finally, with the push-button device of patent no. 66220, the corn of the Advancement of the knife steel indicated, but not the exact measure by which of the to The object to be rotated or drilled actually changes in its thickness or width because the amount of wear and tear on the tool stack cannot be measured.

In order to design the automatic push-button apparatus according to patent no. 66220 in such a way that he, with one-time setting and adjustment of the device, the amount of turning required indicates, without having to assume an initial caliber, and that it also indicates the degree of wear of the Tool, it has undergone the following changes:

The push button apparatus is firmly connected to the side with an arm A , which carries a guide B in which the rod C is guided vertically. This has a dimensional division C ¹ on a smaller scale and has a rack toothing C ² , through which it can be moved up and down by means of the pinion B from the handle £ ^2. The guide B is provided with a vernier division B ³ and a tube D and a magnifying glass, magnifying glass or microscope D ^{1 are} attached in front of the slide, which means enable the divisions to be read precisely and thus the position of the rod C to be precisely determined.

The rod C carries at its lower end a slide E, in which the rod F can be moved horizontally. The latter bears by means of vertical guide F ¹ and accurately detectable by screw F ^'2, the vertical bar G. G is in turn provided with a shoe G ^1, in which the horizontal bar H can be arbitrarily set.

At one end of the rod H , the pointer J is rotatable about pin J ¹ , which is weighted at its rear end J ² and plays with its front end J ³ over a scale K attached to the rod H.

The shoe G ¹ for the rod H is rotatable about the bolt G ² (Fig. 4). An extension L limits the rotation of the rod H in one direction, while towards the other side a key pin M pressed down by means of a spring M ¹ , which engages in a cutout N ^{1 of} the arc N , the movement of the rod H in the other direction stipulates. This mobility of the rod H has the purpose of bringing the pointer J or the rod H out of contact with the workpiece when the tool pieces are clamped.

The pointer J is provided with a blade J ⁱ on the rear weighted side and the graduation of the scale K is chosen in such a way that when the blade J * is lowered by one unit of measurement, double the dimension on the scale K is indicated by the pointer J.

Proceed as follows with this apparatus:

So that it is no longer necessary to measure an initial caliber, the apparatus is set exactly in the geometrical axis of the machine tool (for example a lathe) ^{when it is mounted on the machine tool with the cutting edge J 4.} The apparatus is set for the purpose in such a way that when the rod C and the pointer J are brought to zero, the cutting edge J ¹ lies straight in the central axis (axis of rotation or geometrical axis), ie the height of the center point of the machine tool.

When turning a workpiece by a certain dimension, all that is required is the corresponding adjustment of the rod C to this dimension indicated on it in order to achieve that, after the complete rotation, the pointer J is at zero and the pointer C is at zero. If a body is to be rotated, the diameter of which is, for example, 30 mm, the rod C is set to the division mark 30. Since the division of the rod C is now half of the natural one, that is, the 30 mm division of the rod C is actually only 15 mm in length, the displacement of the rod gives the measure of the displacement of the center point J ⁱ on the radius (namely 15 mm) at. If it is also assumed that the workpiece itself, which is to be turned to a diameter of 30 mm, is not 30 mm, but more, for example 34 mm thick, then the pointer / due to the clamped thicker workpiece is in this way on the cutting edge (loaded side) lifted so that it deflects down to part 4. This measure at the distance from the zero point on scale K indicates by which measure the pointer c of the main patent still has to be set on the scale a ^1. The rod ν (see main patent) is then set against the rotating piece in the manner described in the main patent and supported against the probe rod and the rotation is now carried out in the manner described in the main patent. If the pointer rests on the stop pin F ¹ when turning or on the stop pin Y when drilling, this is a sign of the completion of the turning or drilling.

It is therefore not necessary to start with an initial caliber in the form of the feeler apparatus was set and adjusted according to the center point height of the machine tool during installation.

In the apparatus described there are two scales, the scala a ¹ described in the main patent, on which the pointer c plays, and the scale K on which the pointer J plays. The pointer / lies with its cutting edge J ¹ directly on the object to be rotated and therefore precisely measures its thickness. The pointer c, on the other hand, is moved by means of the feeler rod k and indicates the amount by which the tool steel is pushed forward. If the tool steel does not wear out, if the pointer c is precisely adjusted, both pointers will always be at the same dimensions before the start of the turning. When worn, however, the workpiece turns out to be stronger than the scale a ¹ indicates, because the tool can not be advanced further due to the stop pins yy ^x , and the diameter of the workpiece is greater by twice the amount of wear on the tool. This excess, which is not indicated on the pointer c, can, however, be recognized in the scale of the pointer J , since this pointer indicates the real thickness of the workpiece. So the difference in the position of the two pointers J and c is twice the amount by which the tool has been worn each time it is used. This amount of wear and tear on the tool can then be taken into account immediately after repeated turning, and the incorrect influence on the precision of the turning can thus be compensated for. If the degree of wear of the tool for a certain length z. B. 1.10 mm, and would have to turn 4 mm from the workpiece in order to get to the desired final dimension, the pointer c is set to 4.2 mm and turned off until the pointer c is at the end of the rotation Zero comes, the pointer J has then decreased from a partial 4.00 mm to zero.

Claims (2)

Patent Claims: i. The automatic button for machine tools supplemented with support according to patent no. 66220 so that Position of the apparatus without using an initial caliber and for measuring the Wear of the tool on a vertically displaceable rod with dimensional graduation a horizontal pointer (feeler lever) is mounted, which by moving this rod to an exact distance from the Axis of rotation or center height of the machine tool and thus set to the diameter determined for the tool will. 2. In the case of the under i. marked device, the arrangement of the stop L in connection with the spring pin M for releasing the rod H and the associated pointer J when clamping workpieces and for fixing these parts after clamping. For this purpose ι sheet of drawings.