Title of Invention

LEAK MONITORING UNIT FOR A RING SPINNING MACHINE

Abstract

A leak monitoring unit for a ring spinning machine provided with drafting devices having pneumatically loaded top rollers mounted on top roller bearing and load arms, said leak monitoring unit comprising: a housing (11) mounted in a compressed air supply line (12) of the ring spinning machine; a suspended solid particle (13) movable in the housing between a compressed-air inlet (17) and a first compressed-air outlet (15) of lsaid housing, said suspended solid particle being provided with at least one air penetration opening (14), characterized in that- said housing (11) is provided in its side wall with a second compressed-air outlet (16) which opens into said compressed air supply line (12) outside the housing, said second compressedair outlet being so mounted that when the pressure is very strong, the suspended solid particle (13) can be moved past the second compressed-air outlet (16) to allow compressed-air entering the housing (1) to flow therethrough directly.

Full Text

Description: The invention concerns a leak monitoring unit for a ring spinning machine with drafting devices, on the top roller bearing and load anus of which pneumatically loaded top rollers are appointed, with a housing appointed in the compressed-air supply line of the spinning machine with a suspended solid particle moveable in it between a compressed-air inlet and compressed-air outlet, which is provided with at least one air penetration opening. Such equipment is already known as flow monitors for ring spinning machines with pneumatically loaded top rollers. However, all the constructions used hitherto have the drawback that, due to the small surface of cross-section of at least one air penetration opening of the suspended solid particle, the air supply to the drafting devices is invariably throttled. This small cross-section to the openings is necessary for leakage detection in order to be able to detect even the most minor leaks. When filling the system, for example, after starting the machine, rapid filling, is, however, required with corresponding large flow volumes. When changing batches, when the top roller bearing and load arms are opened or closed in sections, rapidly refilling the system is required with medium flow volumes. In order to be able to meet all these requirements, the flow monitors known hitherto have a bypass around the housing provided with one or several valves. To fill or refill the system, the flow monitor proper is bridged over by the bypass being opened by a corresponding valve control, whereby the large flow volumes required are retained. However, provision and control of these valves is costly and expensive. The present invention is based on the concept of creating a leak monitoring unit that meets all operational requirements in a constructively simple and inexpensive manner. The present invention provides a leak monitoring unit for a ring spinning machine provided with drafting devices having pneumatically loaded top rollers mounted on top roller bearing and load arms, said leak monitoring unit comprising: a housing mounted in a compressed air supply line of the ring spinning machine; a suspended solid particle movable in the housing between a compressed-air inlet and a first compressed-air outlet of said housing, said suspended solid particle being provided with at least one air penetration opening, characterized in that- said housing is provided in its side wall with a second compressed-air outlet which opens into said compressed air supply line outside the housing, said second compressed-air outlet being so mounted that when the pressure is very strong, the suspended solid particle can be moved past the second compressed-air outlet to allow compressed-air entering the housing to flow therethrough directly. The monitoring unit in accordance with this invention has but one single valve formed by the suspended solid particle. Bypass lines with further valves are not necessary here. With high air requirements, for example, when filling or refilling the system and concomitant increased difference in pressure between the compressed-air inlet and the two compressed-air outlets, the compressed-air suspended solid particle is pushed past the second outlet, whereby the compressed air can flow out through it directly. The suspended solid particle with its small air penetration openings can therefore no longer develop any throttle effect. With a low air flow, the suspended solid particle stays underneath the lateral outlet, so that the air must flow through the suspended solid particle"s air penetration openings. This enables even the smallest quantities of air leakages to be recorded. As a matter of expediency, the cross-section surfaces of the two compressed-air outlets may correspond approximately to the cross section surface of the compressed-air inlet. The cross-section surface of at least one of the suspended solid particle"s air penetration openings may be selected to correspond to the maximum admissible leakage size, whereby the sensitivity of the flow monitor is adjustable. As a matter of expediency, the suspended solid particle can be moved by the air flow against the spring force, so that it is always returned to its original position next to the compressed-air inlet opening, as soon as the flow pressure is reduced. Here, the suspended solid particle may be a magnetic one known per se, influencing a Reed contact. The signal triggered by the Reed contact can, for example, trigger an alarm and/or shut down the machine. One preferred example of execution of a leak monitoring unit in accordance with this invention is gone into greater detail below based on the accompanying drawing. The single figure shows monitoring unit 10 with housing 11, which is mounted in compressed-air supply line 12 of a not further described ring spinning machine. A magnetic suspended solid particle 13 can be moved inside housing 11. This magnetic suspended solid particle 13 influences a non-represented Reed contact, whereby, for example, an alarm or even machine shutdown can be triggered when a leak occurs. Magnetic suspended solid particle 13 is provided with a small air penetration opening 14 . Moreover, two compressed-air outlets 15 and 16 are provided on housing 11, both opening into the machine"s compressed-air supply line 12 outside the housing. The first compressed-air outlet 15 is provided opposite compressed-air inlet 17. Therefore, when there is air flow, magnetic suspended solid particle 13 is moved from compressed-air inlet 17 towards compressed-air outlet 15. Should flow pressure occurring be very strong, magnetic suspended solid particle 13 is moved past the second compressed-air outlet 16, so that compressed air entering through inlet 17 can flow out directly through outlet 16 and not via the small air penetration opening 14 of magnetic suspended solid particle 13. This is how the high flow volume required is ensured for rapidly filling or refilling the system. On the other hand, with low flow pressure, magnetic suspended solid particle 13 stays underneath the lateral compressed-air outlet 16, so that the throttle effect of opening 14 is maintained and the Reed contact is triggered as required by the magnetic suspended solid particle. Unit 10 is then in its regular monitoring mode. WE CLAIM: 1. A leak monitoring unit for a ring spinning machine provided with drafting devices having pneumatically loaded top rollers mounted on top roller bearing and load arms, said leak monitoring unit comprising: a housing (11) mounted in a compressed air supply line (12) of the ring spinning machine; a suspended solid particle (13) movable in the housing between a compressed-air inlet (17) and a first compressed-air outlet (15) of said housing, said suspended solid particle being provided with at least one air penetration opening (14), characterized in that - said housing (11) is provided in its side wall with a second compressed-air outlet (16) which opens into said compressed air supply line (12) outside the housing, said second compressed-air outlet being so mounted that when the pressure is very strong, the suspended solid particle (13) can be moved past the second compressed-air outlet (16) to allow compressed-air entering the housing (1) to flow therethrough directly. 2. The leakage monitoring unit as claimed in claim 1, wherein each of the first and second compressed-air outlets has a cross-section surface substantially equal to the cross-section surface of the compressed-air inlet (17). 3. The leakage monitoring unit as claimed in claim 1 or 2, wherein the cross-section surface said at least one air penetration opening (14) is selectable to correspond to the maximum admissible leakage size. 4. The leakage monitoring unit as claimed in any of claims 1 to 3, wherein said suspended solid particle (13) is movable by the air flow against the force of a spring. 5. The leakage monitoring unit as claimed in any one of claims 1 to 4, wherein said suspended particle (13) is a magnetic suspended solid particle which influences a Reed contact. 6. A leakage monitoring unit for a ring spinning machine substantially as herein described, particularly with reference to and as illustrated in the accompanying drawings. A leak monitoring unit for a ring spinning machine provided with drafting devices having pneumatically loaded top rollers mounted on top roller bearing and load arms, said leak monitoring unit comprising: a housing (11) mounted in a compressed air supply line (12) of the ring spinning machine; a suspended solid particle (13) movable in the housing between a compressed-air inlet (17) and a first compressed-air outlet (15) of said housing, said suspended solid particle being provided with at least one air penetration opening (14), characterized in that - said housing (11) is provided in its side wall with a second compressed-air outlet (16) which opens into said compressed air supply line (12) outside the housing, said second compressed-air outlet being so mounted that when the pressure is very strong, the suspended solid particle (13) can be moved past the second compressed-air outlet (16) to allow compressed-air entering the housing (1) to flow therethrough directly.

Documents:

00573-cal-1998-abstract.pdf

00573-cal-1998-claims.pdf

00573-cal-1998-correspondence.pdf

00573-cal-1998-description (complete).pdf

00573-cal-1998-drawings.pdf

00573-cal-1998-form 1.pdf

00573-cal-1998-form 2.pdf

00573-cal-1998-form 3.pdf

00573-cal-1998-form 5.pdf

00573-cal-1998-gpa.pdf

00573-cal-1998-letter patent.pdf

00573-cal-1998-others.pdf

00573-cal-1998-priority document.pdf

00573-cal-1998-reply f.e.r.pdf