JPS61240190A - Precise and rough combination adjusting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION INDUSTRIAL FIELD OF THE INVENTION The present invention provides a means for coarse adjustment in which the drive means for coarse adjustment is present externally to the device, via one end of the drive member, and internally to the device. The invention relates to a fine and coarse adjusting device which is connected to a friction wheel or gear via its other end.

To achieve coarse adjustment, the drive member engages the friction wheel or gear via a lever in a shape-enveloping manner.To change the direction of one rotation, the drive member is a mating member fixed to the device. with a movable bearing force-lockingly connected to the lever, creating an eccentric support point for the lever, so that for a given angle of rotation between the drive member and the driven member, the It is designed to provide leverage for precision adjustment.

The invention finds particular application in length and angle measuring devices, in which the coarse and fine adjustment drives are each exposed to different temperatures to provide a temperature-dependent fine adjustment drive with a low drive moment. It can be used when a passive moment is required.

German Patent No. 152,854 and German Patent No. 3,242,084 describe a fine and coarse adjusting device for use in various optical devices, among others microscopes and geodetic devices. In this case, the drive shaft for precision adjustment is arranged inside the drive shaft, which is designed as a hollow shaft. A fine and coarse adjustment device used in geodetic instruments to focus a telescope is used to rapidly change the focus from the nearest possible target distance to infinity and vice versa; The required sharpening fluid must be met. The function of the drive means for precision adjustment is the moment acting on its driven shaft.

and the frictional moment between the fitting member fixed to the device and the movable bearing, where the eccentric support point for the lever is located.

This kind of technical means is designed to prevent the static friction torque generated when the load applied to each member for coarse adjustment and fine adjustment to be too large in cold weather to ensure that the drive means for fine adjustment is stable. It has the disadvantage that the fine adjustment element may become inoperable when it is no longer sufficient for operation.

However, the static friction torque may only be selected to such a magnitude that it does not exceed a predetermined drive moment.

One of the objects of the invention is to obviate the above-mentioned drawbacks.

Another object of the invention is to provide a fine and coarse adjusting device which provides reliable operation independent of temperature and which produces optimum drive torques even under varying climatic conditions.

Another object of the invention is to provide a fine and coarse adjustment device which produces a temperature-dependent driven moment of the fine adjustment drive means and an optimum drive moment under varying climatic conditions.

Arrangement of the Invention 4 Means for Solving Colors The above objects and other objects, with respect to fine adjustment,
At least one temperature-dependent power storage means is provided between a movable bearing and a mating member fixed to the device for temperature-dependent static frictional torques and driven moments. This is achieved by such a device in which a temperature-independent power storage means is arranged in addition to a temperature-dependent power storage means in a fine and coarse adjustment device.

This temperature-dependent storage means is connected in parallel or in series with the temperature-independent storage means. A thermal bimetallic spring is preferably used as the temperature-dependent storage means.

BRIEF DESCRIPTION OF THE DRAWINGS In order to make the invention easier to understand, three embodiments of the invention will be explained with reference to the accompanying drawings, each of which schematically shows three embodiments of the invention.

FIG. 1 shows a known coarse adjustment drive means employing a fine adjustment drive means according to the invention and a temperature-dependent power storage means in the form of a cup spring.

The driving moment acting on the knob 1 is transmitted to the double lever 3 via a ring 2 screwed to the knob 1 and a pin 6 inserted into the ring 2.

The double lever 3 can rotate around an axis 4 by a certain angle of rotation and transmits its rotational moment via a pin 7 to the lever 5, which is not displaced by a friction wheel or gear 9. This is realized by the double lever 5, which is possibly connected and creates a rotational moment, and the small distance from the pin 7 to the shaft 4 with respect to the pin 6 results in a rotational movement of the gear 9 for a rotational movement of the knob 1, which according to its leverage ratio is greater than 1. A transmission ratio of rotary motion is provided and thus a precise drive is obtained. However, the precision adjustment drive is such that the static friction torque between the movable bearing 10 and the mating member 15 fixed to the device is greater than the load rotation moment acting on the gear 9 in the opposite direction to its drive moment. It is only done occasionally. This load rotational moment is unique due to the inertia and friction of each component being moved.

If this load rotational moment becomes larger than the static friction torque, the leverage of the double lever 3 becomes ineffective, and the rotational moment becomes directly is transmitted to its coarse adjustment drive means.

When the fine adjustment drive means is operated correctly, the coarse adjustment drive is activated by the curved elongated hole 8 provided in the double lever 3.
It is activated only when the gear wheel 9 abuts the shaft 4 during its rotation around this shaft.

If the coarse adjustment driving force exceeds the static friction torque between the fitting member 15 fixed to the device and the bearing 10, a sliding moment will occur between the two.

The driven end moment transmitted by the fine adjustment drive increases because the movement of the components to be moved becomes slower as the operating temperature decreases.

Temperature-dependent power storage means 11 in this fine adjustment drive means
and by arranging a temperature-independent power storage means 12 between its movable bearing 10 and an abutment member 15 fixed to the device, a temperature-dependent static frictional torque and a driven An end moment is obtained and thus the required frictional force at ambient temperature is obtained from the power storage means 12 and at lower temperatures it is obtained from the temperature-dependent power storage means 11. These power storage means 11 and 12 are connected in series with each other,
Or they may be combined in parallel.

In FIG. 1, the temperature-dependent power storage means are designed as bimetallic cup springs.

In FIGS. 2 and 3, this temperature-dependent power storage means is a thermal bimetallic spring, i.e.
It is composed of two leaf springs and one annular spring.

By means of a special configuration of the mobile bearing 10 and the pressure ring 13 fixed by a locking ring 14, it is possible to achieve a further increase in the frictional force with increasing temperature drop.

FIG. 4 is a graph showing changes in the driven end moment when the temperature-dependent power storage means 11 is employed and when it is not employed. As in FIG. 1, the maximum driven end moment is equal to the static friction torque.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a specific example of a refinement/coarse adjustment device according to the present invention, FIG. 2 is a schematic diagram of a specific example of temperature-dependent power storage means used in the device of FIG. 1, and FIG. FIG. 2 is a schematic diagram of a specific example of a temperature-dependent power storage means different from that of the one, and FIG. 4 is a graph showing changes in wave edge moment. 1...Knob 2...Ring 3.5...Double lever 6.7...Bin 8...Elongated hole 9...Gear 10...Movable bearing 11
... Temperature-dependent power storage means 12 ... Temperature-independent power storage means 13 ... Pressure ring 14 ... Locking ring 1
5... Fixed fitting member C C L

Claims (5)

[Claims] (1) A drive means for coarse adjustment is provided with a drive member at one end of the device located outside the device and a friction wheel or gear at the other end located inside the device, in which case the above-mentioned a mating member, in which a drive member is positively coupled with the friction wheel or gear via a lever, and a movable bearing is fixed to the device on the drive member for changing the direction of rotation; A force-locking connection is provided, in which case an eccentric support point is created for the lever, so that during fine adjustment, a greater leverage ratio is obtained for a given angle of rotation between the drive part and the driven part. In the fine and coarse adjustment devices that have come into existence, for fine adjustment, at least one temperature-dependent power storage means is coupled to the movable bearing for temperature-dependent static frictional torques and driven moments. The above-mentioned fine and coarse adjustment device is disposed between the fitting member fixed to the device. (2) The fine and coarse adjustment device according to claim 1, wherein a temperature-independent power storage means is provided in addition to the temperature-dependent power storage means. (3) The fine and coarse adjusting device according to claim 1, wherein the temperature-dependent power storage means comprises a thermal bimetallic spring. (4) Claim 1, wherein the temperature-dependent power storage means and the temperature-independent power storage means are coupled in series.
The fine and coarse adjustment device described in Section 1. (5) The fine and coarse adjusting device according to claim 1, wherein the temperature-dependent power storage means and the temperature-independent power storage means are coupled in parallel with each other.