Patent Grant
7798326
This application claims priority to and the benefit of U.S. application Ser. No. 10/873,673, filed Jun. 22, 2004, which application is incorporated herein by reference in its entirety.
The present invention relates to welding wire packaging and more particularly to an improved retainer ring for a welding wire package that can be re-used as a refrigerator style magnet when the wire packaging is discarded.
Welding wire used in high production operations, such as robotic welding stations, is provided in a package having over 200 pounds of wire. The package is often a drum where a large volume of welding wire is looped in the drum around a central core or a central clearance bore. During transportation and use the level of looped wire in the drum decreases. To control the transportation and payout of the wire, it is standard practice to provide an upper, weighted retainer ring. An early ring is shown in Kawasaki U.S. Pat. No. 4,869,367 wherein the ring slides by its own weight along the inner surface of the drum by outwardly extending resilient members. These members center the ring over the top of the loop wire so the wire can be pulled to the center and paid out during welding. This patent is incorporated by reference herein as background technology which need not be repeated in this disclosure.
A similar retainer ring is shown as prior art in Cooper U.S. Pat. No. 5,277,314 which is directed to an improved upper retaining ring which has an inner contoured surface to facilitate wire payout without tangles. This patent is incorporated by reference herein. A retainer ring more close to the type of ring of the present invention is disclosed in Cooper U.S. Pat. No. 5,819,934 wherein the ring is described as having a function during transportation to move downwardly as the welding wire settles in the drum. This patent is also incorporated by reference herein.
The present invention relates to use of a particular material for the flat retainer ring. This material was introduced by Max Baermann in the late 1950's and is disclosed generally in Baermann U.S. Pat. No. 3,051,988 which is incorporated herein by reference. The Baermann material is barium ferrite in a non-magnetic, flexible binder and is commonly used for flexible magnet sheets of the type used for removable displays. Such material is now manufactured by many companies. The present invention utilizes a thin, flexible permanent magnet sheet of such character manufactured by Flexmag, Inc. of Marietta, Ohio. The present invention does not relate to any novelty in the flexible magnet sheet, which sheet is a standard commercial product having characteristics which need not be repeated in this disclosure.
In the welding industry, tremendous numbers of robotic welding stations are operable to draw welding wire from a package as a continuous supply of wire to perform successive welding operations. The advent of this mass use of electric welding wire has caused tremendous research and development in improving the packaging for the bulk welding wire. A common package is a drum where looped welding wire is deposited in the drum as a wire stack, or body, of wire having a top surface with an outer cylindrical surface against the drum and an inner cylindrical surface defining a central bore. The central bore is often occupied by a cardboard cylindrical core as shown in Cooper U.S. Pat. No. 5,819,934. It is common practice for the drum to have an upper retainer ring that is used in transportation to stabilize the body of welding wire as it settles. This ring, as is shown in Cooper U.S. Pat. No. 5,819,934, remains on the top of the welding wire to push downward by its weight so the wire can be pulled from the body of wire between the core and the ring. Each loop of wire has one turn of built-in twist so that when it is paid out, the twist introduced by releasing a loop of wire is canceled. Hence the wire is “twist-free” when it reaches the contact tip of the welding gun. The built-in twist causes the wire to spring up from the top of the stack when unrestrained. The weighted ring prevents wire from springing up due to the built-in twist. The weight of the ring is critical. Heavier rings tend to bend or recast the wire, causing wire to wobble when it exits the contact tip, although it is more effective to prevent tangle. Lighter rings can be easily lifted by the wire during payout, thus losing its contact to the top of the wire stack; and thereby losing its intended purpose of restraining wire movement at the top of the wire stack. Lighter rings have more propensity of tangle, although producing less wire wobble. This is the pitfall of the weighted ring design, essentially facing the difficulty of striking a balance of less tangle and less wire wobble. Tangles are detrimental to the operation of the package since they cause down time of the robotic welding station. Tangles are caused by many adverse movements of the wire loops on top of the wire stack. The wire has a winding cast that can snap around the outside of the retainer ring or the wire can bunch and slip at the inside of the retainer ring. The most common tangle is caused as wire is pulled from the inside of the ring and is referred to as “e script” because of its shape. An e script tangle stops operation of the welder and must be removed. Retainer rings so far on the market are not effective in preventing e script tangles. This type of tangle is caused by poor alignment of drive rolls of the wire feeder that builds up back-twist in the wire as it feeds the wire. The twist ultimately makes it way back to the drum and leads to an e script tangle. The objective of a retainer ring design is to increase operating welding time between successive e-tangles. The weighted retainer rings have not been successful in eliminating such tangles. The present invention is related to a retainer ring which essentially eliminates e script tangles in the welding wire being pulled from the center of the looped wire body of a drum package.
In addition, due to the high volumes of wire used during many welding operations, especially robotic welding operations, there is also a need for a wire package that can be easily and economically disposable. As can be appreciated, it is not economical to re-use the packaging utilized to ship and dispense the welding wire.
In accordance with the present invention, the standard weighted retainer ring, as shown in Cooper U.S. Pat. No. 5,819,934, is formed from a thin flat, flexible permanent magnet sheet. Thus, the welding wire new package includes a cylindrical drum with a central axis and containing multiple layers of looped welding wire defining the wire stack to be paid out, which body has an upper ring shaped surface with an outer cylindrical surface generally matching the drum and an inner cylindrical surface defining a central bore concentric with the drum axis. The wire body is overlaid with a flexible permanent magnet ring on the top of the upper ring shaped surface. This magnet retainer ring allows welding wire to be paid out from under the ring and upwardly from the central bore of the welding wire body loaded into the drum. The flexible magnet sheet is a standard commercial product; however, its use as a retainer ring for a welding wire package involves cutting the commercial sheet into a ring shape having an outer periphery covering or overhanging the wire stack and an inner periphery which is generally circular and matches the inner surface of the stored welding wire stack. Furthermore, in view of the fact that the magnet retainer ring will be disposed of after the welding wire in the wire package is consumed, the magnetic retainer ring is printed with marketing material such as a company logo which can be cut from the ring and used by the end user in similar fashion as a refrigerator magnet. This reduces the amount of waste produced by the packaging and provides an effective marketing tool.
The primary object of the present invention is the provision of a retainer ring for a welding wire package wherein the retainer ring is formed from a sheet of flexible permanent magnet material that is held on the top of the wire by the magnetic force created by the sheet and not by its weight and which includes material printed on the ring that can be cut from the ring and affixed to virtually any metal object.
A further object of the present invention is the provision of a retainer ring, as defined above, wherein marketing material is printed on the ring.
Still a further object of the present invention is the provision of a retainer ring, as defined above, wherein the retainer ring reduces the amount of package material that is discarded after the wire in the packaging is consumed.
Another object is to provide a medium to easily communicate marketing material to the end user.
These and other objects and advantages will become apparent from the following description taken together with the accompanying drawings.
The foregoing objects, and more, will in part be obvious and in part be pointed out more fully hereinafter in conjunction with a written description of preferred embodiments of the present invention illustrated in the accompanying drawings in which:
A standard welding wire drum type package is shown in
The present invention relates to a retainer ring R that is used in drum 10 to prevent tangles as wire W is pulled from the body of wire. Ring R is cut from a flexible permanent magnet sheet and has a top surface 60 and a bottom surface 62. The sheet is cut into a shape defining an outer periphery 64 and an inner periphery 66. As shown in
A suitable magnetic sheet from which ring R is formed is available from Flexmag Inc. in Marietta, Ohio. The ring has a thickness b that is preferably 1/16 of an inch. The thickness can be adjusted generally between about 0.01-0.10 inches. The preferred sheet is made from ferrite particles in a non-magnetic binder. The ferrite is normally barium ferrite and the binder is polyethylene. The magnetic strength of the flexible sheet is preferably 0.6 Megagauss Oersteds. However, it has been found that a magnetic sheet having less than about 1.0 Megagauss Oersteds can be used. Of course, other magnetic particles can be used instead of the low cost ferrite, which is normally used in the commercial flexible permanent magnet sheets. The sheets can be easily cut by a punch press without losing any magnetic energy. As shown in
Referring to
In greater detail, after the welding wire is consumed, the end user of the welding wire package can remove ring R from the package and cut one or more of printed materials 100, 102, 104, 106, 108, 110, 112, 114 and/or 116 from the ring. The end user can then use the piece(s) cut from the ring as a refrigerator-style magnet or give them to others for the same use. The printed material can be within a cutting guide line 118, as is shown for printed material 100, to help direct the cutting by the end user. Further, cutting line 118 can include at least a partial perforation to make removing the printed material easier. In addition, the printed material can include a printed background portion 120 containing a desired background color and/or design for the printed material. As can be appreciated, by including a printed background, only a portion of the ring needs to be printed based on the number of printed materials used on the ring. In addition, by including background portion 120, the printed material does not need to be precisely cut from the ring. Ring R can further include several of the same printed materials on one ring so that the end user can pass out the printed material to multiple co-workers and/or other individuals for each wire package purchased. Further, since ring R is made from a flexible plastic material, the printed material can be easily cut from the ring.
As is shown in
While considerable emphasis has been placed on the preferred embodiments of the invention illustrated and described herein, it will be appreciated that other embodiments and/or equivalents thereof can be made and that many changes can be made in the preferred embodiments without departing from the principals of the invention. Accordingly, it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.
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