US2035119A - Indicating device for use in connection with grinding tools - Google Patents

Description

March 24-, 1936. v FGLSCHE 2,035,119

INDICATING DEVICE FOR USE IN CONNECTION WITH GRINDING TOOLS Filed July 2, 1954 3 SheetsSheet 1 March 24, 1936. V 'j c 2,035,119

INDICATING DEVICE FOR USE IN CONNECTION WITH GRINDING TOOLS Filed July 2, 1954 3 Sheets-Sheet 2 Wm. M

March 24, 1936. v FOLSCHE 2,035,119

INDICATING DEVICE FOR USE IN CONNECTION WITH GRINDING TOOLS Filed July 2, 195 3 Sheets-Sheet s Patented Mar. 24, 1936 i UNITED STATES INDICATING DEVICE FOR USE IN CONNEC- TION WITH GRINDING TOOLS Viktor Fiilsche, Velten, near Berlin, Germany Application July 2, 1934, Serial No. 733,391 In Germany July 4, 1933 Claims. (Cl. 51165) This invention relates to an indicating device for use in connection with grinding tools in-.

ground on both sides of the wheel by correspondingly disposed grindingv devices. Machines adapted to be used for the plane Working of blanks consisting of all sorts of materials, for example ceramic plates, stovetiles, and the like, and employed ona large scale require careful supervision of the groups of grinding means arranged on both sides of the feed gear, each of which may comprise a combination of a plurality of successive grinding wheels for roughing andfinishing, because these grinding means are subjected to a relatively large wear owing to the necessary speeds and output.

If the grinding wheels are worn down beyond a certain limit, accurate working, particularly with respect tomeasurements, is no longer possible. In numerous fields of application, e. g., those mentioned above, not only wear but also too much advance for one or the other wheel during the original adjustment would have a detrimental effect, as the glazing of ceramic products might crack off and the entire work be destroyed. I r The control of the accuracy of the working method depended hitherto chiefly on the attention of the operator who had continually to adjust the various grinding wheels by hand according to wear, which was inconvenient, required a relatively large amount of work and lacked absolute reliability.

The invention eliminates these troubles by providing a device for visibly indicating the working operation as Well as enabling the wear of grinding wheels in machines of the type described to be determined, so that the operator, by glancing at a scale or other indicating device, always knows exactly whether Wear is still within permissible limits or the wheels have to be adjusted one way or other. Furthermore, according to the invention, the grinding wheels are adjusted from a central place of control, and not singly, and means are provided for automatically stopping the feed gear in case of errors in operation, service troubles of the grinding motors or excessive wear of the grinding wheels.

By way of example, one form of the invention as applied to stove tiles is illustrated in the accompanying drawings, in which Figure 1 is a partial cross section of a grinding device showing somewhat diagrammaticallythe control de- 5 vice according to the invention; Fig. 2, a side view thereof; and Fig. 3, a plan of the device showing the centrally controlled operating members for the adjustment of the individual grinding means, only one control device being shown in Figs. 2 and 3.

Referring to the drawings, a is the feed gear carrying at its outer circumference the fixing means b for holding the work consisting in the example shown of the tiles 0. The feed gear a further carries on both sides the rims 01 concentrically disposed with the axis of the gear a at a slight distance from the outer circumference thereof. The rims d have a wavelike surface and as many wavecrests e and wave troughs f as there are fixing means b on the circumference of the gear a, so that each fixing means is provided with a wave crest and trough, or, in other Words, wave crests or troughs will always be found at those points of the rims d which correspond, in radial direction, to the fixing means.

During the rotation of the feed gear a the rims d disposed on both sidesthereof, i. e., their wave crests and troughs, are engaged by feelers g preferably fitted with the rolls g, each feeler g being secured to a lever h rotatable about the axis 1'. The lever h, is actuated by a spiral spring is which is firmly arranged and has the tendency to act on the free arm of the lever so as to press the feeler g disposed on the other lever arm onto 5 the surface of the rims d. In this Way, the lever' h is controlled by the wave crests and troughs of the rims d and carries out a slow oscillating motion. Through a bore or forklike portion of the lever 71., as shown in the free arm thereof, 40

extends a shaft p which can be reciprocated in a fixed guide q on the frame of the device and which carries at its front end asecond feeler 1 whose feeling surface is coated with a protective layer of highly resisting material, preferably 5 widia steel. Widia steel is a material well known in Germany,'and comprises an alloy of Wolfram-carbide containing a small amount of cobalt, it being a product of Krupp, Essen. This feeler l or itsshaft p, for instance by means of a driving pin 1' disposed on the shaft 10 or of a disc, etc., is alternately withdrawn from the feed gear a and released again by the motion of the lever h in one direction or the other. When released, it is pressed upon the feed gear a by the action of a spring s disposed in the guide q. The course of these motions of the shaft 1) and thus of the feeler l is controlled by the feeler g rolling over the control faces e and f on the feed gear a in such a Way that the measuring feeler I will be released for free motion towards the feed gear a when a piece of Work passes the measuring device andfor placing'itself for a short time upon the side thereof to be worked. As soon as the entire work has passed the measuring point, or shortly before, other control faces begin to act and the measuring feeler is lifted off again.

In the embodiment shown the working position of the measuring feeler involves a wave crest of the control surfaces, which turns the lever h clockwise about the pin 2', so"that the driving pin' 1" is out of engagement. When the feeler 9 passes into a wave trough, the lever h will act again upon the pin 1- and withdraw the measuring feeler from the feed gear against the action of the spring 5.

Both feelers may of course be arranged on the same side of the lever, in which case the association of the wave crests and troughs will be reversed, or the measuring feeler may be connected with the lever.

' Owing to the control described, the feeler I will not begin or continue to touch the side of the tile before the work is opposite it, as otherwise the passing edge of the work would destroy it.

In the manner described the degree of motion of the feeler l towards the feed gear a, which can be easily transmitted to a scale or the like, will indicate the degree of working and thus of wear, or the adjustment of the grinding wheels, which can then be read off. For example, the transmission of the measuring results is effected by causing the feeler l or its shaft p to act by the rods t upon a second lever arranged so that it can move' directly over a scale a or actuate the indicating device in some other way. This scale is preferably cylindrical to facilitate reading, and the scales of each working device associated with each grinding motor are preferably united to form a central control.

In the indicating device shown the lever 111. will deflect towards the left if the grinding wheels are adjusted too far with respect to the feed gear and thus too thick a chip is taken off. On the other hand, ifthe wear of the grinding wheels has progressed too far and machining thus become unsatisfactory, the lever 'm. will deflect towards the right on the scale shown when the blank passes the feeler Z. It is therefore possible to fix in a simple may a standard point or interval on the scale within which the deflections ofthe indicating instrument must take place, so that the grinding means concerned may be adjusted as soon as these deflections are too great in either direction. As in other indicating instruments, the scale may show different colors or possess special marks for the range of permissible deflection, or signals, such as bells, may be provided for sounding an alarm when the permissible tolerances are exceeded.

The various grinding devices, each of which is associated with a measuring device of the type described, can thus be adjusted to accurate cutting ranging for instance from 5 mm. for roughing to 1 mm. for preparatory and 0.5 mm. for final finishing.

It is advisable to provide incombination with, or in addition to, the control devices other devices for stopping the feed gear in case of overloading of a grinding wheel, e. g., if a wrong adjustment has been made by mistake, so as to prevent destruction of the grinding devices.

It is further preferable to connect the stopping devices with the grinding means, that is, one stopping device with one grinding means, in such a way that the stopping devices will act when the grinding means are worn down to a certain deall individual adjustments and adjust accordingly from his central control position on one side of the machine the motors y by actuating the hand wheels a (Fig. 3) which, by means of'bevel gears 22, control the drives w by chains or the like.

The application of the control device according to the invention is of course not limited to the grinding device for tiles, ceramic plates, etc. shown, but the device, in combination with correspondingly altered working and fixing means, may be used also for controlling the working of other materials.

The invention is, further, not restricted to the constructional embodiment shown, but may be applied in many ways by changing the construction without departing from the spirit of it.

I claim:-

1. An indicating device for use in connection with grinding wheels handling fiat-surfaced or flat-edged blanks fed to the grinding wheels by a gear provided with fixing means for the blanks, comprising, in combination, a feeler for measuring the working degree while the blank is passing the measuring station, means for withdrawing the feeler from the path of the blank, means for returning the feeler to the path of the blank, an indicating instrument for recording the degree of working, and means for connecting said feeler with said indicating instrument.

2. An indicating device for use in connection with grinding wheels handling flat-surfaced or flat-edged blanks fed to the wheels by a gear provided with fixing means for the blanks, comprising, in combination, a feeler for measuring the working degree while the blank is passing the measuring station, means for withdrawing the feeler from the path of the blank, means for returning the feeler to the path of the blank, an indicating instrument for recording the degree of working, means for connecting said feeler with said indicating instrument, a second feeler for controlling the first feeler, said second feeler cooperating with a wavelike rim on the feed gear, said rim having crests and troughs as control surfaces, each of said surfaces being associated with a corresponding blank fixing means.

3. A device according to claim 2, comprising a reciprocating shaft for the measuring feeler, a fixed guide for said shaft in the frame of the device, 7 a lever carrying the control feeler, said lever withdrawing the measuring feeler from the feed gear when the feeler is in intermediate position between the fixing means, and a spring for pressing the feeler upon the side of the blank when the blank and the feeler are opposite one another.

4. A device according to. claim 2, comprising a reciprocating shaft for the measuring feeler, a

fixed guide for said shaft in the frame of the device, a lever carrying the control feeler, said shaft passing through a bore in said lever, driving means on said shaft for engaging with said lever and alternately, on rotation of said lever, withdrawing the measuring feeler from the feed gear and releasing it again when the feeler faces a blank, and a spring for pressing 'the released feeler against the side of the blank.

5. A device according to claim 2, comprising a reciprocating shaft for the measuring feeler, a fixed guide for said shaft in the frame of the device, a lever carrying the control feeler, said lever withdrawing the measuring feeler from the feed gear when the measuring feeler is in intermediate position between the fixing means, a spring for pressing the feeler against the side of the blank when the blank and the feeler are opposite one another, a second lever adapted to actuate directly or indirectly the indicating instrument, and means connecting the shaft with said second lever.

VIKTOR FOLSCHE.

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