| Cylinder ring for preventing end mark of rolled sheet -> Monitor Keywords |
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Cylinder ring for preventing end mark of rolled sheetRelated Patent Categories: Metal Deforming, By Deflecting Successively-presented Portions Of Work During Bodily Movement Thereof (e.g., For Coiling, Levelling, Curving Or Troughing Material In Movement), To Form Spiral Coil, With Core Inside CoilCylinder ring for preventing end mark of rolled sheet description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060169016, Cylinder ring for preventing end mark of rolled sheet. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates, in general, to cylinder rings which prevent end marks from being generated on rolled sheets and, more particularly, to a cylinder rings which have a plurality of elongated protrusions or embossments arranged around an outer surface of the cylinder ring to prevent the formation of an end mark that is a stepped mark generated on the rolled sheet in a latitudinal direction while the rolled sheet, produced by either a hot or cold rolling process, is wound around a mandrel. BACKGROUND ART [0002] FIG. 1 is a view showing a conventional cylinder ring 40 around which a rolled sheet 50 is wound. FIG. 2 is a partially enlarged view of the conventional cylinder ring 40 of FIG. 1 around which the rolled sheet 50 is wound. FIG. 3 is a plan view of the rolled sheet 50 with end marks M after being wound around the conventional cylinder ring 40 of FIG. 2. [0003] As shown in FIGS. 1 through 3, generally, the rolled sheet 50 produced by a rolling mill 10 is transferred to a mandrel 30 of a down coiler. Thereafter, a sheet end 51 of the rolled sheet 50 is guided by a guider unit 20, thus the rolled sheet 50 is wound around an outer surface of the mandrel 30. At this time, to prevent the rolled sheet 50 wound around the mandrel 30 from being deformed by a collision, and to prevent a slip between the rolled sheet 50 and the outer surface of the mandrel 30 from being caused, the cylinder ring 40 is provided on the outer surface of the mandrel 30. [0004] The rolled sheet 50 is tightly wound around the conventional cylinder ring 40 to prevent the rolled sheet 50 wound around the cylinder ring 40 from being undesirably unwound or loosened from the cylinder ring 40. Therefore, the rolled sheet 50 wound around the cylinder ring 40 is tightened to apply a compression force toward a central portion of the mandrel 30. As shown in FIG. 2, a space is defined around the sheet end 51 of the rolled sheet 50 at a position between the cylinder ring 40 and the rolled sheet 50. The rolled sheet 50 wound around the cylinder ring 40 applies a pressure on each of portions of the rolled sheet 50 which are aligned with the sheet end 51. Thus, a plastic deformation is generated on each of the portions of the rolled sheet 50 which are aligned with the sheet end 51, so that an end mark M is generated on each of the portions of the rolled sheet 50 which are aligned with the sheet end 51, as shown in FIG. 3. The rolled sheet 50 with the end marks M causes a deformation or stripping of a coated or painted layer thereof, thus reducing its production quality. [0005] To solve the problems experienced in the conventional cylinder ring 40, a variety of techniques for preventing the end mark M of the rolled sheet 50, controlling a speed winding the rolled sheet, grinding the sheet end of the rolled sheet to be not stepped, or mounting a separate absorbing unit on the sheet end, were proposed in Japanese Patent Nos. 3042381-B2, 3152286-B2, Japanese Patent Laid-Open Publication Nos. Heisei 10-005860-A, Heisei 10-128439-A and 2000-5917-A. However, to prevent the end marks M from being generated on the rolled sheet, the conventional techniques according to the above-mentioned force users to mount a separate unit on the rolled sheet for each rolling process or to execute an additional process. Thus, the conventional techniques impose additional expenses on users. [0006] Furthermore, a cylinder ring with protrusions and depressions to prevent the end marks M from being generated on the rolled sheet wound around the cylinder ring was proposed in Korean Patent Laid-Open Publication NO. 2003-0020468. [0007] FIG. 4 is a perspective view showing another conventional cylinder ring 100 for preventing formation of an end mark of a rolled sheet 50. FIG. 5 is a plan view of the conventional cylinder ring 100 of FIG. 4 in which the rolled sheet 50 is wound around the cylinder ring 100. FIG. 6 is a partially enlarged sectional view showing states of the rolled sheet 50 and the conventional cylinder ring 100 of FIG. 5 being varied according to a position of a sheet end 51 of the rolled sheet 50 relative to the cylinder ring 100 when the rolled sheet 50 is wound around the cylinder ring 100. [0008] As shown in FIGS. 4 and 5, the conventional cylinder ring 100 includes a plurality of elongated protrusions 110 and a plurality of elongated depressions 120 which are alternately arranged around an outer surface of the cylinder ring 100 defining a ring-shaped cross-section. In the conventional cylinder ring 100, the rolled sheet 50 may be wound around the cylinder ring 100 in one of the three states shown in (a), (b) and (c) of FIG. 6. [0009] That is, as shown in (a) of FIG. 6, the sheet end 51 of the rolled sheet 50 may be in contact with a sidewall of a second elongated protrusion 110b which is one of the plurality of elongated protrusions 110. The rolled sheet 50 of the above-mentioned state allows the sheet end 51 thereof to be bent inward by a pressure applied from an upper portion of the rolled sheet 50 wound around the cylinder ring 100, with the second elongated protrusion 110b acting as a support. Due to the pressure generated from the upper portion of the rolled sheet 50 wound around the cylinder ring 100, a third elongated protrusion 110c, placed in back of the second elongated protrusion 110b, is more compressed radially toward a rotating axis of the cylinder ring 100 than the second elongated protrusion 110b. Thus, the sheet end 51 of the rolled sheet 50 in the above-mentioned state almost does not have a repulsive force against the pressure applied from the upper portion of the rolled sheet 50 wound around the cylinder ring 100. Therefore, the end marks M are rarely generated on the rolled sheet 50. [0010] As shown in (b) of FIG. 6, the sheet end 51 of the rolled sheet 50 is placed above an elongated depression 120 between a first elongated protrusion 110a and the second elongated protrusion 110b after passing over the second elongated protrusion 110b. In the rolled sheet 50 of the state of (b) of FIG. 6, the sheet end 51 of the rolled sheet 50 is bent inward by the pressure applied from the upper portion of the rolled sheet 50 wound around the cylinder ring 100. Thus, the second elongated protrusion 110b is elastically compressed radially toward the rotating axis of the cylinder ring 100. At this time, the second elongated protrusion 110b is more compressed by a thickness of the rolled sheet 50 than the first elongated protrusion 110a which is placed in front of the second elongated protrusion 110b. Therefore, the sheet end 51 of the rolled sheet 50 in the above-mentioned state almost does not have a repulsive force against the pressure applied from the upper portion of the rolled sheet 50 wound around the cylinder ring 100, so that the end marks M are rarely generated on the rolled sheet 50 wound around the cylinder ring 100. [0011] As shown in (c) of FIG. 6, the sheet end 51 of the rolled sheet 50 may be placed along a linear ridge of the second elongated protrusion 110b. An area of the linear ridge of each of the elongated protrusions 110 is very small in comparison with the remaining port of the outer surface of the cylinder ring 100. Thus, the possibility of occurrence of the state of (c) of FIG. 6 is very low compared to the possibility of the states of (a) and (b) of FIG. 6. However, in case that the sheet end 51 of the rolled sheet 50 is placed along the linear ridge of the second elongated protrusion 110b, even though the second elongated protrusion 110b is more or less elastically compressed, the sheet end 51 of the rolled sheet 50 may have a repulsive force in the same manner as that described for the cylinder ring 40 of FIG. 1. Therefore, the conventional cylinder ring 50 is problematic in that the end marks M may be generated on the rolled sheet 50.an ineffective treatment of the sludge. DISCLOSURE OF THE INVENTION [0012] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a cylinder ring which prevents an end mark from being generated on a rolled sheet wound around the cylinder ring even when a sheet end of the rolled sheet is placed on a peak of any protrusion, and which has a plurality of elongated protrusions and a plurality of elongated depressions which are alternately arranged around the outer surface of the cylinder ring to be inclined relative to a rotating axis of the cylinder ring at a predetermined angle, or has a plurality of embossments arranged around the outer surface of the cylinder ring to be spaced apart from each other at regular intervals, thus preventing the end mark from being generated on the rolled sheet wound around the cylinder ring. [0013] In order to accomplish the above object, the present invention provides a cylinder ring which receives a mandrel therein and is made of an elastic material to wind a rolled sheet around an outer surface of the cylinder ring in a coiled pattern, the cylinder ring comprising: a plurality of elongated protrusions and a plurality of elongated depressions which are alternately arranged around the outer surface of the cylinder ring, wherein the elongated protrusions and the elongated depressions are inclined relative to a rotating axis of the cylinder ring at a predetermined angle to prevent end marks from being generated on the rolled sheet wound around the cylinder ring. DESCRIPTION OF DRAWINGS [0014] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: [0015] FIG. 1 is a view showing a conventional cylinder ring around which a rolled sheet is wound; [0016] FIG. 2 is a partially enlarged view of the conventional cylinder ring of FIG. 1 around which the rolled sheet is wound; [0017] FIG. 3 is a plan view of the rolled sheet with end marks after being wound around the conventional cylinder ring of FIG. 2; [0018] FIG. 4 is a perspective view showing another conventional cylinder ring for preventing formation of an end mark of a rolled sheet; [0019] FIG. 5 is a plan view of the conventional cylinder ring of FIG. 4 around which the rolled sheet is wound; [0020] FIG. 6 is a partially enlarged sectional view showing states of the rolled sheet and the conventional cylinder ring of FIG. 5 being varied according a position of a sheet end of the rolled sheet relative to the cylinder ring when the rolled sheet is wound around the cylinder ring; Continue reading about Cylinder ring for preventing end mark of rolled sheet... Full patent description for Cylinder ring for preventing end mark of rolled sheet Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Cylinder ring for preventing end mark of rolled sheet 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 Cylinder ring for preventing end mark of rolled sheet or other areas of interest. ### Previous Patent Application: Major diameter correcting re-roll thread rolling die Next Patent Application: Method and device for shaping and then lifting a workpiece Industry Class: Metal deforming ### FreshPatents.com Support Thank you for viewing the Cylinder ring for preventing end mark of rolled sheet patent info. 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