DE2621891C3 - Lens edge grinding machine and associated lens holder - Google Patents

Description

The invention relates to a lens edge grinding machine and an associated lens carrier according to the Generic term of the claim.

In the machine known in this respect from Wi-GM 17 69 322, the flexible lens holder plays a key role in the transmission of the forces occurring during the machining process to the workpiece holder shaft. However, this can lead to inaccuracies in the workpiece, because the flexibility of the workpiece holder allows undesired, uncontrolled movements of the workpiece during the machining process.

The object of the invention is therefore to make the known machine and its associated lens carrier so further training that this is not involved in the transmission of the forces occurring between the tool and the workpiece during the machining of the workpiece.

The invention solves this problem by the features indicated in the characterizing part of the patent claim.

These cause the lens holder to have practically no Needs to transfer more forces, but essentially only has a leadership function It is therefore no longer necessary to apply a torque to the lens via the individual Transfer lens wearer. This reduces the risk that the lens wearer is out of his or her exact position Setting opposite the lens is moved out. Furthermore, there is a risk of deformation or Twisting of the lens wearer is reduced. A lens wearer who is easily deformable can easily twist when a torque is applied to di <* Lens is transferred. In addition, there is still the advantage of the present construction that the Lens wearer can in any case remain on the lens even if in between, for example, the Position of the optical center of the lens in relation to the glasses frame must be checked.

The invention is illustrated by way of example in the drawing. It shows

F i g. 1 the lens carrier in plan view and

F i g. 2 the lens holder attached to a lens, and on the machine side the adjacent parts of the Recording of the lens carrier and the counter holder in cross section.

_{The lens wearer I 1} 2 shown in Fig. 1 consists of two layers 1 and 2 with a through hole 4. The layer 2 is more compressible than the layer 1. The layer 1 can be made of solid neoprene rubber and the layer 2 of a be made of more compressible material, e.g. B. a cellular synthetic material of the type of plastic foam. The exposed side of the layer 2 is coated with a cement or adhesive that is normally applied before the use of the

Lens wearer through a protective sheet of paper or the like.

is covered

Have at least layer 1 and possibly also layer 2

π three semicircular recesses on its inner edge 3. The recesses 3 are arranged asymmetrically around the center of the lens carrier 1, 2, so this can be held in a predetermined angular position relative to a complementary component.

which is received within the lens wearer 1, 2 as is to be described below. Preferably, two of the recesses are at diametrically opposite locations provided, while the third recess is 90 ° away from the other two recesses.

From Fig. 2 can be seen how the lens holder 1,2 with a lens 30 carried by him is received in the lens edge grinding machine and with her cooperates

The lens edge grinding machine has one for this

annular receptacle 25 with three laterally protruding Approaches 26 which correspond to the recesses 3 of the lens carrier 1, 2. The recording 23 is like this dimensioned so that it fits tightly into the bore 4 of the lens carrier 1.2, so that the lens 30 also is arranged in the machine in a precisely defined position.

The grinding machine also has a drive shaft 27 and a counter-holder shaft 28, which against the opposing optical surfaces ütr Ln _1:; 30 can be moved to hold them between them and rotate. The drive shaft 27 and the counterholder shaft 28 are each provided on the workpiece side with a head 29 or 29 'made of rubber or a similar material so that the lens surfaces are not damaged.

In the machine according to the invention, the receptacle 25 for the lens carrier 1, 2 therefore only has one Leitfunkticn, while the rotary drive from the shaft 27 via its head 29 directly to the processing lens 30 is transferred so that the

Lens carrier I, 2 during the machining process

insov-eit does not need to transfer any additional forces.

When the edge of the lens 30 through the grinding machine

ne has been brought to the desired shape, the lens 30 together with the lens carrier 1, 2 of the Grinding machine removed and checked for its seat in a glasses frame or other frame. If further shaping of the lens edge is necessary, the lens 30 can again be put into the machine are used, the attached to the lens 30 lens carrier 1, 2 and interacting therewith Recording 25 of the machine ensure that the lens 30 is exactly in the position previously assumed is brought back.

1 sheet of drawings

Claims (1)

Claim: Lens edge grinding machine and associated lens carrier, with a machine frame and a hollow shaft-like receptacle mounted therein for the lens carrier, which guides it centrally, and with a counter-holder shaft arranged coaxially opposite the receptacle, the lens carrier consisting of an elastic plastic with a centrally arranged bore and with the The receptacle can be coupled non-rotatably, characterized in that the bore (4) of the lens carrier (I ₁ 2) is a continuous bore and a rotationally driven shaft (27) is mounted coaxially in the receptacle (2S), the head (29) of which the lens ( 30) against the head (29 ') of the Gtgenhalterwelle (28).