Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1994-04-08
1996-04-16
Jones, David
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
72307, B21D 702
Patent
active
055071686
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for bending a strip material such as a steel strip, and, in particular to an apparatus for bending a strip material such as a band blade for a Thomson blade wooden model.
BACKGROUND ART
An apparatus for bending a strip material, is known wherein a stationary die having a slit through which the strip material is passed is provided, and the strip material projecting from the slit is pressed by a movable die against an outlet corner of the slit, so that the strip material is bent in one direction by a fixed angle.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an apparatus for bending a strip material in which a movable die having a novel configuration is adopted so that, even when a rotation transmission mechanism is connected only to one end in the axial direction of the movable die, the parallelism of a pair of opposing pressing die portions of the movable die is not impaired during a bending process, and the rotation transmission mechanism is connected only to one end in the axial direction of the movable die so that the user can easily replace only a shaft body integrally comprising a stationary die, without disassembling gears of the rotation transmission mechanism, and the movable die.
To achieve the above-mentioned object, the apparatus for bending a strip material according to the present invention is an apparatus for bending a strip material which comprises a stationary die having a slit through which a strip material is passed, and a movable die which is moved by a predetermined amount when feeding of the strip material passed through the slit is halted, and in which the strip material passed through the slit is pressed by the movable die against an outlet corner of the slit, whereby the strip material is bent the through a fixed angle, wherein the stationary die is integrated with a middle portion in the axial direction of a shaft body, the lower end of the shaft body is fixed by mounting bolts to a machine base through a mounting member, the movable die comprises at a predetermined position along the circumferential direction a pair of pressing die portions which oppose each other in the circumferential direction, and is formed into a cylindrical shape having an opening for introducing the strip material at a position opposite to the pressing die portions, the cylindrical movable die is rotatably fitted outward onto the shaft body with correspondence to the stationary die, and a rotation transmission mechanism for transmitting a rotation force to the movable die is connected to one end in the axial direction of the movable die.
According to this configuration, since the movable die comprising the pair of pressing die portions is formed into a cylindrical shape, the parallelism of the pair of pressing die portions is free from being impaired. The movable die is connected only at its one end with the rotation transmission mechanism. When the stationary die, or the shaft body comprising the stationary die is to be removed, therefore, the mounting bolts by which the mounting member is attached to the machine base are removed, and the shaft body and the mounting member can be removed. When there arises the necessity of removing the shaft body, it is not required to remove the gears of the rotation transmission mechanism or remove the movable die before the removal of the shaft body, and it is possible to remove only the shaft body so that the stationary die provided for the shaft body can be replaced. Even after the replacement of the stationary die, it is not necessary to adjust the parallelism of the pressing die portions.
In the bending apparatus, a downward taper portion disposed at the lower end of the shaft body is fitted into a mounting hole which is opened in the mounting member and which has an upward spread shape, and a key is fittingly attached to key ways which are respectively formed in the downward taper portion and the mounting hole, whereby the positional relationship between the slit of
REFERENCES:
patent: 757078 (1904-04-01), Wood
patent: 5203195 (1993-04-01), Ritter et al.
Mizukawa Suehiro
Ogawa Naoki
Ohtani Susumu
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