JPS583045Y2 - Device for increasing long-term stability of measuring mechanisms for textile testing machines - Google Patents

Description

[Detailed Description of the Invention] In the present invention, the measuring mechanism is composed of several plate elements arranged vertically, and is attached to the outer surface of the case.
The present invention relates to a device for increasing the long-term stability of a measuring mechanism of a textile testing machine, in which a sample can pass through a passage formed between these plate-like elements.

In such a testing machine, thread unevenness can be measured by passing a fiber, such as a thread, as a sample through a passage between plate-shaped measurement elements serving as electrodes, and converting changes in capacitance between the electrodes into an electrical signal. I can do it.

Measuring mechanisms of this type are susceptible to changes in the surrounding atmosphere, e.g. its temperature or humidity, uncontrollable air flows or unstable temperature conditions, e.g. between the inside and outside of the test machine. It is extremely susceptible to mechanical changes due to deformation of the element and the deposition of foreign matter on the measurement mechanism itself.

In particular, textile machinery is extremely prone to dirt as the textile raw material releases a large amount of dust during the processing process.

Fiber accumulation occurs at each processing step, but the fibers can also be carried away by weak air currents and deposited again elsewhere.

Although the detrimental effects of fiber accumulation can be eliminated by suitable methods and attempts have been made to avoid the formation of significant differences in the area immediately surrounding the measuring mechanism, it is important to note that this type of influence cannot be removed completely from extremely sensitive measuring mechanisms. It is impossible to exclude it.

In order to prevent fiber deposition and, on the other hand, to eliminate the influence of heat generated in the test machine and dissipated to the outside through the measuring mechanism, it was proposed to expose the measuring mechanism to an air flow.

However, such attempts have not yet been successful in that although fiber deposition can be prevented, the expectations for long-term stable measurement mechanisms have so far not been met.

The present invention is based on such experience and provides a device that increases the long-term stability of the measuring mechanism of a textile testing machine.

Therefore, according to the present invention, an air flow from inside the case flows out through the air outflow openings along the upper surface of the plate elements and over these plate elements, and this air flow flows into the spaces between the plate elements. This creates a movement of secondary air in the air.

Exposing the measuring mechanism directly to the airflow exiting from the air outlet opening has an adverse effect on the measuring mechanism, and preventing any airflow in the vicinity of the measuring mechanism does not increase stability. , the formation of a weak vortex from the ambient air in the vicinity of the measuring mechanism significantly improves the long-term stability.

In this way, the airflow heated by the heat generated by the electrical components within the tester and flowing out of the case of the tester is prevented from directly influencing the measuring mechanism.

The secondary air flow induced by this heated air flow has the same temperature and humidity as the atmosphere which can be considered sufficiently constant over long periods of time.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The device shown in FIG. 1 has a case 1 that houses a fan that draws ambient air through an inlet air filter 2. The device shown in FIG.

As a result, the pressure inside the case 1 increases and tries to escape to the outside through the existing gap or through an opening intentionally formed in the wall of the case 1.

The measuring mechanism, for example a measuring capacitor, consists of several metal plate-like elements 3 as electrodes arranged vertically outside the case 1, and the sample to be tested, for example a fiber 4, is placed between feed rollers 5,
6 to be pulled through between the plate-shaped measuring elements 30.

A slit 7 is made in the wall of the case 1 above the measuring condenser as an air outflow opening, and through this slit 7 the air under positive pressure generated in the case 1 flows approximately horizontally along the top surface of the condenser in the direction of arrow A. This blows away any lint that flows over this top surface and tends to deposit on the top surface of the electrode forming the measuring capacitor.

It goes without saying that this air flow A should not be so strong as to blow the sample 4 under test out of the range of the measuring electrode 3.

The air flow A blowing away the upper surface of the measuring electrodes is arranged between the measuring electrodes in such a way that the air is carried upward from the bottom of the measuring mechanism through between the measuring electrodes 3 in the direction of the arrow B and maintains a constant movement. A vortex of secondary air is formed in the passage formed.

In order to prevent fiber dust from accumulating in the vicinity of the measuring electrode 3, not only the carbon-nitrogen air flow A but also the secondary air swirl B take part.

Furthermore, the eddy current B of the air around the measuring electrode 3 has a cooling effect and stabilizes the surface temperature of the measuring electrode 3.

The primary air sucked into the case of the tester through the air filter 2 not only has the above-mentioned effects, but also constantly cools the heat-generating electrical components inside the case, which has another advantage in addition to the stability of the measurement mechanism. give.

It should be noted that the air filter 2 must be cleaned or replaced periodically, but the installation of the filter is facilitated by a suitable design of the fittings.

Instead of the air flow exiting the case in the direction of extension of the measuring electrode 3, as shown in FIG. 1, a suitable guide tube 10, as shown in FIG. A similar effect can be obtained by causing the air flow to flow along the outer surface of the case 1 at right angles to the plane formed by the electrodes.

In this case too, the vortex B of the secondary air flows upwards from the bottom of the measuring electrodes 3 through them and has the already explained favorable influence on the stability of the measuring electrodes.

The device according to the invention is not limited to application to capacitive measuring mechanisms, but can also be effectively used, for example, to optical or acoustic measuring mechanisms.

Next, examples of embodiments of the present invention are as follows.

(1) The amount of air required to form the air flow A is sucked in through the air population 2, and is used to cool the loss heat generated by the electrical components inside the case 1, causing the temperature to rise and lower between the outflow and
It flows out from 10.

(2) The air flow mountain opening lower is oriented such that the air flow A passes in the direction of the plate surface of the plate-shaped measuring element 3 along its upper surface.

(3) The air outflow opening 1 is arranged so that the air flow A crosses the plate surface of the plate-shaped measuring element 3 at right angles to the upper surface thereof.
0 is oriented.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a plan view of another embodiment. 1...Case, 3...Plate measuring element,
4...Sample, 7...Slit, 10.
... Guide tube, A ... Air flow, B ...
...Secondary air flow.

Claims (1)

[Scope of utility model registration request] The measuring mechanism consists of several plate elements 3 arranged vertically, and is attached to the outer surface of the case 1.
In a device in which air can pass through a passage formed between these plate-like elements 3, an air flow A from the inside of the case 1 passes through the air flow mountain opening lower 10 and passes along the upper surface of the plate-like elements 3 through these plates. Increasing the long-term stability of the measuring mechanism for a textile testing machine, characterized in that it flows out over the plate-shaped elements 3 and that this air flow A causes a movement of secondary air B in the space between the plate-shaped elements 3. Device.