Metal deforming – With use of control means energized in response to activator... – Sensing work or product
Patent
1996-08-13
1998-06-30
Crane, Daniel C.
Metal deforming
With use of control means energized in response to activator...
Sensing work or product
72294, 72307, B21D 501
Patent
active
057717257
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP95/02747.
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a method of producing a band blade in which notches are formed at appropriate positions in an edged strip material bent into a predetermined shape, and more particularly to a method of producing a band blade used in a Thomson blade wooden model which is used for punching a plate member or a sheet member made of wood, paper, cloth, leather, plastic, or the like into a predetermined shape, or forming cuts of a predetermined shape in such a member.
The present invention relates also to a method of bending a strip material made of a steel plate such as a blade member of the band blade, and to an apparatus for bending a strip material.
2. Prior Art
As exemplarily shown in FIG. 22, a Thomson blade wooden model is produced by pressing a band blade 1 which is bent so as to have a predetermined shape, into slitlike cuts 3 formed in a base plate 2 so as to be embedded into the plate. The band blade 1 has notches 6 which are formed at predetermined positions in the longitudinal direction by depressing the back edge. The notches 6 correspond to connecting portions 3a between the cuts 3 of the base plate 2, respectively. In a complete product of a Thomson blade wooden model, the edge 4 of the band blade 1 is projected from the base plate 2. The Thomson blade wooden model of FIG. 22 may be used for forming cuts of a predetermined shape in a plate member, a sheet, or the like.
Conventionally, when the band blade 1 is to be produced, a straight edged strip material which is drawn out from a coil of a hoop material consisting of an edged strip material is cut off to a required length, the notches 6 are formed in the obtained edged strip material of the constant length, the edged strip material in which the notches 6 are formed is subjected to a bending process so as to have a predetermined shape, and an extra portion at an end of the edged strip material is cut off, thereby conducting an end process.
In contrast, when the band blade 1 is to be produced from an edged strip material of a constant length, it is usual that the following steps are individually performed by using independent apparatuses: producing a number of edged strip materials of a constant length which are cut off from the above-mentioned roll; selecting an edged strip material of a constant length from a number of straight edged strip materials which are collectively stored, and forming the notches 6 in the strip material; and selecting a predetermined one from a number of edged strip materials which are collectively stored and in which the notches 6 are formed, and subjecting the selected strip material to a bending process.
In band blades 1 of plural kinds which are to be used in different Thomson blade wooden models, it is often the case that the band blades are slightly different from each other in length, or in position of forming the notch 6 or shape of the bend. When an edged strip material which has been once stored is taken out and the notches 6 are formed in the strip material or when a bending process is performed on an edged strip material which has been once stored and on which the notches 6 are formed, therefore, it is sometimes difficult to, at a glance, distinguish the edged strip material to be taken out as a process object, from other strip materials. In some cases, an edged strip material which is not a process object is erroneously determined as a process object and the notching process or the bending process is applied to the erroneously selected strip material.
When the step of cutting of a straight edged strip material from a roll, the notching step, and the bending step are independently performed as in the case of the prior art, improvement in production efficiency is restricted. Furthermore, in the case where a procedure in which a straight edged strip material of a constant length is drawn out and cut off from a coil of a hoop material and the notching process and the bending process are then applied to
REFERENCES:
patent: 3563283 (1971-02-01), Tufektshiev
patent: 3823749 (1974-07-01), Ritter
patent: 4161110 (1979-07-01), Ritter
patent: 4280350 (1981-07-01), King
patent: 4773284 (1988-09-01), Archer
patent: 5461893 (1995-10-01), Tyler
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