Metal deforming – With use of control means energized in response to activator... – Sensing work or product
Patent
1999-07-28
2000-11-14
Crane, Daniel C.
Metal deforming
With use of control means energized in response to activator...
Sensing work or product
72294, 72307, 72388, B21D 5364
Patent
active
061453595
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates, in general, to a device for forming a cutting blade for prints and, more particularly, to a device capable of forming such a cutting blade by appropriately bending and cutting a metal strip into desired blades through integrated work regardless of a difference in the size of metal strips.
BACKGROUND ART
In order to produce various flat prints or printed packing materials, such as paper boxes or thermoplastic films, it is necessary for flat prints or films to be cut along a designed cutting line, and for box-shaped packing materials to be cut along a designed cutting line of a printed paper board prior to forming the board into a box.
Such a cutting process for producing flat prints, paper boxes, or thermoplastic films has to be performed using a single-edged cutting blade which extends along a desired cutting line. Such a cutting blade is set on a flat wood block in a way such that the blade has a uniform height. In such a case, the sharpened surface of the single edge of the blade faces outward. The wood block, with the cutting blade, is installed on a press, which is used for cutting such flat prints or packing materials.
Typical cutting blades are produced by cutting a thin special steel strip into pieces. Such a steel strip has a band-shaped configuration and is sharpened at one edge prior to being subjected to the bending and cutting processes. Such a metal strip has to be bent and cut into cutting blades which individually form a designed cutting line along which flat prints or packing materials are cut by the cutting blade. After the metal strip is bent and cut into cutting blades, one or more cutting blades are set on a wood block. Therefore, it is primarily necessary to precisely bend and cut the metal strip into cutting blades. In addition, the metal strip is also processed through a plurality of sub-processes as follows.
For example, the metal strip has to be regularly notched at the lower edge opposite to the sharpened edge, thus forming bridge notches at the lower edge. Such bridge notches are for firmly holding the position of a cutting blade when the blade is set on a wood block. That is, the bridge notches almost completely prevent the set position of the cutting blade on the wood block from being unexpectedly deformed due to external impact. Sometimes, it is necessary to form a plurality of V-notches along the sharpened edge of the metal strip, thus form a cutting blade which is preferably used for forming perforated lines on prints, such as stamps. Sometimes, the metal strip may be bent at right angles. In such a case, a bending slot has to be transversely formed on a side surface of the metal strip prior to bending the metal strip at right angles. When the metal strip has to be precisely bent, it is preferable to bend the metal strip manually rather than mechanically and this forces the metal strip to be subjected to a marking process of forming bending points on the metal strip prior to manually bending the metal strip.
Of course, the above-mentioned sub-processes of forming bridge notches, V-notches, bending slots and bending points are well known to those skilled in the art. However, in known blade forming devices, such processes are not performed through integrated work, but are separately and selectively performed, so that the known devices fail to achieve desired precision and reduce productivity, and increase the production cost of the cutting blades.
In the known devices, the process of cutting the metal strip into desired cutting blades is separately performed from the above sub-processes, thus more reducing productivity and increasing the production cost of the cutting blades.
In an effort to overcome such problems, a long metal strip, with a sharpened edge, may be wound around a feeding roll so as to be forcibly and continuously fed from the roll to a bending nozzle. At a position around the bending nozzle, the metal strip comes into contact with a plurality of bending pins which are used for bending the metal strip into a des
REFERENCES:
patent: 3696655 (1972-10-01), Hinks
patent: 4773284 (1988-09-01), Archer et al.
patent: 5461893 (1995-10-01), Tyler
patent: 5463890 (1995-11-01), Tachibana
patent: 5771725 (1998-06-01), Mizukawa
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