DE10329289A1 - center scribing gauge has sliding spring loaded center scribe driven on toothed rod to place at exact center of jaws or by decoupling at preferred location - Google Patents

Abstract

A center scribing gauge has interior and exterior jaws with a sliding center scribe driven by a decoupling roller on a toothed rod to allow placing at the exact center or at any preferred location for marking by scribing using a spring loaded scribe or by color.

Description

State of technology

Under There are 81 hits for the search term "Anreißen". These are mainly elevation and measuring devices. No Patent describes the scribing in the middle of a workpiece by means of a measuring gear.

A disadvantage of the current state of the art is that two work steps with different tools are necessary for marking workpieces. First, the workpiece is measured in a conventional manner (eg vernier calipers) in order to then mark it with a scriber and a stop. Creating tools twice can cause errors and take more time. Furthermore, the numerical value of the median must be determined by machine or by mental calculation, which is another source of error. When marking thin workpieces such as pieces of sheet metal with a height gauge, large errors occur due to slight tilting of the sheet (due to the lack of support) 9 ).

Object of the invention

With In the center teaser, two tasks are fulfilled: measuring and the For further processing necessary marking a workpiece.

With The invention combines two steps into one and achieves high accuracy and reproducibility. With the center teaser can be measured and marked simultaneously with high accuracy. Through the measuring gear leaves Mark the center without calculating the median. The Marking can be done either with a scriber or with a surface-friendly Pen be marked. additionally can by the decoupling of the measuring gear any position of the workpiece approached and marked. The marking of holes on the edge of the workpiece can over an additional scale be positioned and also saves the calculation of the actual size and thus sources of error.

By The center jug becomes a simpler, faster and more accurate Marking workpieces possible and thus facilitates the processing and production of workpieces.

function Description

The Center jig consists essentially of three larger assemblies: The basic body, the slide with gear and the slide with Anrisstaster

The basic body ( 2 ) of the center jaw is almost identical to that of a conventional vernier caliper. In the middle of the main body is next to the measuring scale a screwed rack, which also serves as a guide for the second rack.

At the Approach of the measuring leg was attached a small slit so that the slide with the detent button between the closed measuring legs Has space and the center tapping gauge completely closed can.

The middle slide ( 3 ) is guided by the main body and has a mark for reading the scale. Furthermore, a rack is attached to it by means of cover, which is guided by the main body, large rack and gear. On the carriage, a receptacle for the Anrisstaster removably mounted. Due to the removable holder, different marking methods (scriber, alarm button, color marking, etc.) are possible. Furthermore, the center carriage still has a locking mechanism.

The carriage with the gearbox ( 4 ) is guided by the main body and has a scale for reading the scale. Within the cover, a gear shaft with two gears is fixed, which correspond to a ratio of 1: 2.

By a spring-loaded button, the gear shaft can be decoupled from the rack ( 5 ). As a result, the middle slide not only in the ratio 1: 2 positionable, but it can be moved to arbitrary marking a workpiece.

Of the size Leg serves to touch the components to be measured. Farther he still has a locking mechanism.

With the help of the spring-loaded Normanrissspitze ( 3 ), the component can be measured simultaneously and marked in the middle. This is done by pushing the knurled bolt down with the scriber and moving it forwards and backwards. The drawing pin is exactly guided by the removable holder. If the recording is replaced by another, a marking with a conventional scriber or colored pencil is also possible.

principle of operation

The operating principle is similar to that of conventional calipers. The production part is clamped between the measuring legs and slightly fixed by hand to prevent slippage. Now the outside dimension can be read. The scriber is already in the middle of the component and can be used for scribing.

Becomes the transmission slide pulled back to measure a component or to mark at the same time the transmission shaft through the Intervention of the big one Gear in the attached to the body Rack set in motion. The second rack, the middle slide is fixed, positions the middle slide (with the alarm button) through the translation from 1: 2 right in the middle of the workpiece.

Advantages of the center jaw gauge

Earlier The components were measured first and then cumbersome marked with jigs. These Method is more time consuming, since two steps are necessary and inaccurate, because there are two different ones for measuring and tearing Tools are used.

With It is possible to use the center jig gauge with high accuracy the workpiece to measure and the center of the component to be machined in one step to mark. Measuring and marking runs almost simultaneously. This accuracy is also achieved by using the tear pin accurately positioned and accurately guided by the transmission.

It it is no longer necessary to create rulers or elevation. Of the height scribe with thin sheets was not recommended anyway, as a slight tilting already size Positioning error caused.

It can clean (arbitrarily deep, because repetition possible) straight-line markings on the surface of the material are generated because the scribe pin is accurately guided. When scribing By hand, a stop is always needed to make a longer straight line To create marking.

When Tear pin can be a conventional standardized pin can be used, which can be bought everywhere for pennies. The leadership the drawing pin is designed for this DIN. This is when the scriber a wear effortless and cheaper Change the scriber guaranteed.

These Mittenanrisslehre is extremely low in manufacturing costs, because in the Construction was taken care of right from the start, manufacturing-friendly and to save material, to use standard parts and as a basic body the already existing body a conventional one Calipers to use.

by virtue of The simple and robust construction of the center jug can be achieved emanate from a simple handling and a high reliability. The transmission is characterized by the wide tooth flanks and the low Load per tooth (Bachsche relationship) very wear-resistant and thus contributes to Reliability, Accuracy and economy at.

Examples of the others design

For already surfaces treated workpieces does it make sense to surfaces to mark, but not to destroy. Since the scriber a treated surface e.g. Eloxalschicht would damage is the scriber replaced by a colored marking pen, so that e.g. drilling on the surface can be marked without the surface to destroy.

The spring-loaded button allows decoupling of the gear from the rack so that the teeth of the gear wheels no longer engage with the racks. As a result, any (stepless) position can be approached with a workpiece and ultimately also marked. For the actual tear, the center slide can be areded either by itself or via the racks. This option can be useful, for example, when positioning holes on a rectangular workpiece to position the holes a few millimeters from the edge (see 7 . 8th ).

For such Working is an extra Scale provided above that Information gives as far as the drawing pin away from the edge. This can work at decimals and with it possible Spare sources of error. The scale can be on the measuring leg on the gear slide and be mounted on the measuring leg of the body, so that from the edge of the detachable receptacle for the alarm button can be. Of course enough the scale only for a small area of about 15mm.

By the decoupling and the scale opens up a wide field of activity the center jug, because not only a marking in the middle of the workpiece possible is, but also any mark with simultaneous measurement the edge distance without having to settle the workpiece.

Additionally offered Shafts with a different gear ratio, e.g. from 0.25 or 0.75 extend the range of application of the center jig gauge.

For higher accuracies The vernier can also through a digital display down to the micron range be replaced.

The guidance of the alarm button is decreasing bar and easy to assemble.

When additional Stop for thin workpieces like e.g. Sheet metal parts can two smaller stops be mounted on the bottom of the measuring legs and prevent thus slipping off the thin ones Measuring jaws. Sheet metal parts or the like can be "hung up", so to speak.

Claims (11)

Mittenanrisslehre, for determining the outer, inner, and depth measurement and automatic detection and marking of the workpiece center, characterized in that there is a longitudinally displaceable center slide with Anrisstaster and a transmission slide on a base body. Center jaw gauge according to claim 1, characterized that the main body a measuring scale, a measuring leg for measuring outside dimensions, a small one Measuring leg for internal measurement and a fixed rack has. Center jaw gauge according to claim 1 and 2, characterized that on the main body a longitudinal adjustable gear slide with second large measuring leg for external measurement, second small measuring leg for internal dimensioning, clamping device, changeable gear shaft with different gear ratios and vernier sits. Center jig gauge according to claim 1, 2 and 3 characterized characterized in that the transmission shaft is decoupled. Center jaw gauge according to claims 1 to 4, characterized that on the main body a longitudinal adjustable center slide with perpendicular to the longitudinal direction has adjustable Anrisstaster. Center jaw gauge according to claim 5, characterized that the alarm button over the gear shaft and a rack are placed exactly in the middle of the workpiece can be. Center jaw gauge according to claim 5, characterized that the Anrisstaster is movable and resiliently mounted. Mittenanrisslehre according to claim 4 to 7, characterized characterized in that after decoupling the gear shaft of the Anrisstaster at any, quantitatively detectable via a measuring scale Position can be positioned. Mittenangle gauge according to claims 5 to 8, characterized that the attack button is a workpiece through a surface deformation marked by a tear pin. Mittenanrisslehre according to claim 5 to 9 thereby characterized in that the Anrisstaster a workpiece by a surface gentle Type marked by color marking. Mittenanrisslehre according to claim 5 to 10 characterized characterized in that the movable Anrisstaster is removable.