Threaded – headed fastener – or washer making: process and apparat – Apparatus for making headed fastener – e.g. – nail – rivet – etc. – Wire nail making
Patent
1993-09-22
1994-11-08
Larson, Lowell A.
Threaded, headed fastener, or washer making: process and apparat
Apparatus for making headed fastener, e.g., nail, rivet, etc.
Wire nail making
B21G 312
Patent
active
RE0347779
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a tool ring for securing blanks in a machine of the type comprising a pair of rotating rings whose opposite, plane side faces are formed with a plurality of holding tools so adapted that an oblong blank can be secured substantially radially between a pair of holding tools in respective ones of said rings. The Danish Patent Specification 143 [965] 935 discloses an example of such a machine.
The number of holding tool halves in each ring can typically be 20 to 40, and the holding tools have till now been mounted by shrinkage, each of the rings having been pre-formed with a plurality of axial cuts mating exactly with the holding tools. It will be appreciated that it is very expensive to manufacture the known tool rings because of the tolerance requirements, where particularly the radial distance of the cuts from the centre of the ring, which defines the radial position of the holding tools, is critical. The manufacturing costs are an extremely important aspect since, usually, the known tool rings have to be replaced completely if just one of the many holding tools or cuts in the ring is defective.
The object of the invention is to provide a tool ring of the above-mentioned type, which is considerably cheaper to manufacture and which can moreover be serviced at lower costs.
This object is achieved by a tool ring for securing blanks in a machine of the type comprising a pair of rotating rings. Opposite, plane side faces of the rings are formed with a plurality of holding tools and are so adapted that an oblong blank can be secured substantially radially between a pair of holding tools in respective ones of said rings and at least one ring has a groove adapted to receive the holding tools. Spacer tools are adapted to be fixed relative to the groove between the holding tools, each of said spacer tools and adjacent holding tools have cooperating wedge faces. One or more of the holding tools is secured between a pair of spacer tools, for forcing the holding tools into engagement with an engagement face of the groove, which face is disposed co-axially with the axis of the ring. When the mentioned groove is produced, the ring may e.g. be fixed in a ball bearing similar to the one holding the rings in the known machine, so as to permit, in a very inexpensive manner, a fine tolerance of the wall in the groove which defines the radial position of the tools.
It will be appreciated that this is far better than having to make about 20 to 40 cuts in each tool ring. The tool ring of the invention has the additional advantage that it is relatively easy to replace a defective holding tool as the fixed distance tools in the vicinity of the defective holding tool are just to be loosened to replace the holding tool.
In the preferred embodiment, the grooves in a set of tool rings are formed so that planes of the opposite rings form a small angle with each other, the bottom of the groove in one ring is parallel with the plane of the ring. The bottom of the groove in the other ring forms an angle with a radius in said ring corresponding to said angle between the ring planes, which permits the use of uniform tools in the two rings.
It is of significant importance that at least every second spacer tool can be displaced to accommodate the manufacturing tolerances of the tools, so that not more than every second spacer tool can be positioned in the groove against movement lengthwise in it. At least some of the positioned spacer tools are secured preferably by means of screws, which can in principle fix the spacer tools in a radial or in an axial direction in the tool ring. An embodiment in which the spacer tools are fixed in a radial direction in which a plurality of spacer tools with uniform arc distance is adapted to be fixed in a direction toward the said engagement face. The cooperating wedge faces intersect the plane of the respective ring in intersection lines which converge in a direction toward the center of the ring. An embodiment in which the spacer tools are fixed axially, has a plurality of spacer tool
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Enkotec A/S
Larson Lowell A.
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