| Device for grinding spinning cots -> Monitor Keywords |
|
|
  Device for grinding spinning cotsUSPTO Application #: 20070042689Title: Device for grinding spinning cots Abstract: The device has a rotating grinding surface and a receptacle into which a spinning cot to be ground is inserted. The receptacle is advanced in a direction toward the grinding surface until the spinning cot inserted into the receptacle contacts the grinding surface. A size determination device for determining the size of the spinning cot is provided, wherein the size determination device has distance sensors and a computing unit for deriving the size of the spinning cot. The distance sensors operate with measuring beams that have an orientation such that the measuring beams impinge on an outer peripheral surface of the spinning cot inserted into the receptacle on at least three points that are spaced apart from one another in a circumferential direction of the spinning cot. (end of abstract)
Agent: Gudrun E. Huckett Draudt - Wuppertal, DE Inventor: Udo Stentenbach USPTO Applicaton #: 20070042689 - Class: 451065000 (USPTO) Related Patent Categories: Abrading, Machine, Combined The Patent Description & Claims data below is from USPTO Patent Application 20070042689. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The invention concerns a device for grinding spinning cots, comprising: [0002] a rotating grinding surface, [0003] a receptacle into which the spinning cot to be ground is insertable, means for advancing the receptacle in a direction toward the grinding surface until contact is made between the grinding surface and the spinning cot inserted into the receptacle, and [0004] a device for determining the size of the spinning cot inserted into the receptacle, wherein this device is comprised of detection means for at least one geometric value, wherein this value is not the size of the spinning cot, and a computing unit for deriving the size of the spinning cot based on a measured geometric value detected by the detection means. [0005] Such devices are used in connection with industrial processing of textile fibers. In spinning devices, the spinning cots perform the transport of the textile fibers. In this connection, the surfaces of the spinning cots that are usually made from plastic material are subject to great wear so that they must be frequently reground. The diameter of the spinning cots is sized from the start with oversize such that the cots can be reground several times by grinding devices configured for this purpose, wherein only a few tenths or hundredths of a millimeter are removed, respectively. After such a grinding treatment, the surface of the spinning cots is again exactly round and cylindrical. [0006] For grinding a spinning cot, the spinning cot is fastened in the grinding machine on an automatically operating slide that advances the spinning cot by automatic control to the grinding surface of a grinding roller. Manipulation of the spinning cot to be reground is realized by means of a swivel arm that is provided with a receptacle for the axle of the spinning cot. The swivel arm with the spinning cot inserted therein is then advanced fully automatically against the grinding roller. For calculating the amount of removal the swivel arm is usually provided with an incremental encoder that detects the pivot angle and thus the movement of the swivel arm during the grinding process. For adjusting the zero point, the incremental point is detected that results upon pressing the cot against the grinding surface, i.e. upon first contact. Subsequently, the cot is ground wherein in practice two different methods are employed. According to the first method, all cots are ground to a predetermined diameter. According to a second method, they are all subjected to the same amount of removal and thus the same reduction of their diameter. The amount of removal is calculated based on the pivot angle difference that is detected by the incremental encoder. Since this is however an indirect measuring method, the measuring precision is determined by many influencing factors; in practice, this does not provide for a really precise calculation of the grinding result. SUMMARY OF THE INVENTION [0007] The invention has the object to provide a device for grinding spinning cots that enables a more exact measurement of the cot geometry and that operates moreover substantially free of influencing factors that falsify the measured result. [0008] As a solution to the object a device having the aforementioned features is proposed that is characterized by distance sensors operating with measuring beams and having an orientation such that the measuring beams impinge on the outer peripheral surface of a spinning cot inserted into a receptacle at least on three points that are spaced apart from one another in the circumferential direction of the spinning cot. [0009] Such a device enables a direct measurement of the geometry of the respectively inserted spinning cot, i.e., of its diameter or radius. The device according to the invention operates therefore substantially free of influencing factors that falsify the measured result. By a direct detection of the surface of the respective spinning cot, the operation of the measuring unit is relatively insensitive with regard to possible dust deposits. Also, the hardness and the flexibility of the material of the cots to be ground and the state of their axles have hardly any effect on the measured result. A contribution to precision is moreover provided by the fact that the measuring system works completely contactless. [0010] According to a preferred embodiment, the distance sensors operate with an orientation such that all measuring beams impinge on the outer peripheral surface of the spinning cots inserted into the receptacle at the same axial length of the spinning cot. In this way, measurement imprecisions are excluded that can occur in case of a slight axial displacement of the measuring beams. [0011] A further embodiment is characterized by an orientation of the measuring beams such that at least one first measuring beam is directed to a point adjacent to the center axis of the spinning cot, and at least one additional measuring beam is also directed to a point adjacent to the center axis but onto the side facing away from the first measuring beam. This enables even more precise measured results. [0012] According to one constructive embodiment of the device, the distance sensors are fastened to a common holder; this enables a very precise positioning of the sensors and thus an improvement of the measuring precision. Preferably, the holder is provided with positive locking elements onto which or in which the distance sensors are mounted. Additionally, a screw connection with the holder can be provided. [0013] In another embodiment it is proposed that the distance sensors are rigidly connected to the receptacle, preferably embodied as a swivel arm, or the holder is rigidly connected to the receptacle. This enables measurement at any time during the inward and outward pivoting of the swivel arms because even then the spinning cot is within the detection range of the distance sensors. Already at the time of setting up or preparing the actual grinding process, a detection of the actual state of the spinning cot is possible. Under no circumstances is it possible that a play possibly present at the swivel arm can have an effect on the obtained measured result. BRIEF DESCRIPTION OF THE DRAWINGS [0014] One embodiment of the invention will be explained in the following with the aid of the drawings. It is shown in: [0015] FIG. 1 a side view of the grinding machine with a spinning cot to be ground inserted therein; [0016] FIG. 2 a schematic illustration of the basic configuration and of the function of a laser distance sensor operating according to the principle of triangulation; [0017] FIG. 3 a schematic illustration of the arrangement of a total of three laser distance sensors relative to the spinning cot to be ground; [0018] FIG. 4 in a perspective illustration the attachment of three distance sensors on a holder plate; [0019] FIG. 5 an illustration comparable to FIG. 3 for explaining the geometric conditions for a radius determination by means of three points; and [0020] FIG. 6 a further illustration for deriving the geometric conditions. DESCRIPTION OF PREFERRED EMBODIMENTS [0021] In FIG. 1 a part of a grinding machine for grinding spinning cots is shown in a greatly simplified illustration. Such grinding machines are utilized primarily in spinning works. In spinning works the spinning cots function as transport rollers for guiding the textile fibers; in this connection, the cots are subject to great wear so that frequent regrinding is required. From the start, the diameter of the spinning cot is oversized so that they can be reground several times. [0022] FIG. 1 shows for this purpose a frame 1 of the grinding machine with a grinding roller 2 that is also arranged on the frame 1 and is driven by a drive motor. The outer peripheral surface of this grinding roller 2 provides the grinding surface 3 for grinding the spinning cot referenced in the drawings by reference numeral 5. For grinding the spinning cot 5, a slide 7 is arranged on the frame 1 so as to be horizontally movable, i.e. essentially movable in the direction toward the grinding roller 2. On the slide 7 a swivel arm 9 is supported at 8. On the end of the swivel arm facing the grinding roller 2, the swivel arm 9 has a receptacle 10 for the axle of the spinning cot 5. By actuating the swivel arm 9 as a result of the force F, the swivel arm 9 pivots together with the inserted spinning cot 5 downwardly so that the spinning cot 5 comes to rest against a driven drive roller 12 arranged underneath. As a result of friction the drive roller 12 rotates the spinning cot 5 so that the cot during the grinding process is rotated counter to the rotational direction of the grinding roller 2 and its surface is ground by being in contact with the grinding surface 3 of the grinding roller 2. [0023] On the swivel arm 9 a holder 13 is fastened and on it, in turn, three distance sensors 15a, 15b, 15c are fastened. The measuring beams 17a, 17b and 17c of these distance sensors 15a, 15b, 15c are oriented toward the surface, i.e., the outer peripheral surface 18, of the spinning cot 5 to be ground on the grinding machine. Continue reading... Full patent description for Device for grinding spinning cots Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Device for grinding spinning cots patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Device for grinding spinning cots or other areas of interest. ### Previous Patent Application: Apparatus for treating edges of panels and method Next Patent Application: Rotor structure of pneumatic tool Industry Class: Abrading ### FreshPatents.com Support Thank you for viewing the Device for grinding spinning cots patent info. IP-related news and info Results in 0.535 seconds Other interesting Feshpatents.com categories: Daimler Chrysler , DirecTV , Exxonmobil Chemical Company , Goodyear , Intel , Kyocera Wireless , |
||
