Cutting – Tool or tool with support – Rotatable type
Patent
1991-01-16
1992-10-06
Watts, Douglas D.
Cutting
Tool or tool with support
Rotatable type
83687, B26F 114, B21D 2836
Patent
active
051522098
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a punching tool arranged in a rotary punching machine, comprising a revolving male tool carrying punches along its periphery and revolving female tool coacting with the male tool and provided with punching bushes disposed about its circumference as die plates.
Punching tools of this type operate at high speeds in known punching machines. If it happens for one reason or other that the punches come out of synchronous engagement with the punching bushes, or that a punch breaks, both the male tool and the female tool normally have to be replaced due to the fact that the circumferential surfaces of these tools, and also the bores in which the punching bushes are received, and often even the bores serving for mounting the punches, have been damaged by punches or broken fragments.
Now, it is the object of the present invention to minimize such damage.
SUMMARY
The invention achieves its object by an arrangement according to which such a male tool and/or a female tool are provided with a groove which extends in the circumferential direction and is recessed radially into the circumferential surface, between the individual punches or the punching bushes, respectively, the depth of the groove being greater than the length of engagement of the punches in the punching bushes.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features of the invention will appear from the following description of one embodiment of the invention, in conjunction with the drawings in which reference characters refer to the same parts throughout the different views. The individual features may be employed in any embodiment of the invention either individually or in any combination.
The drawings are not necessarily to scale, emphasis instead being placed upon illustrating principles of the invention in a clear manner.
FIG. 1 is a fragmented, side-elevational, view showing a pair of punching tools, partly in section;
FIG. 2 is a sectional view taken along line II--II in FIG. 1;
FIG. 3 is a fragmented, top view of a bent-off portion of a circumference of a female tool of this invention containing the punching bushes, in enlarged scale;
FIG. 4 is an exploded, fragmented, sectional view taken along line IV--IV in FIG. 3; and
FIG. 5 is a fragmented, sectional view taken along line V--V in FIG. 3.
DESCRIPTION OF PREFERRED EMBODIMENT
The embodiment of the invention as illustrated in the drawings comprises radially directed punches 2 mounted rigidly at a periphery of a revolving disk-like male tool 1, extending through a peripheral surface 1' thereof. The way in which the punches are fixed in place is not illustrated in detail, however, as can be seen in FIG. 1, they are separated, or spaced, circumferentially from one another. A female tool 3 cooperating with the male tool 1 is equipped with punching bushes 4 which serve as die plates and which are fixed in a circumferential surface 3' of the female tool 3 by screws 5. The punching bushes 4 are each fitted, or embedded, snugly in a bore 6 below said circumferential surface 3' and each defines a central bore 7 intended for accommodating punches 2 which plunge into the bore over a length of engagement of 0.5 mm, for example. The punching bushes 4, as can be seen in FIG. 1, are separated circumferentially from one another. A shoulder 8 disposed at one point of each punching bush 4 serves for receiving a head 9 of the screw 5 as the latter is screwed into a threaded bore 10 in the female tool. In the mounted condition, when the punching bush 4 is fixed in the bore 6 by the screw 5, the forward, somewhat conical end of the punching bush 4 extends substantially flush with the circumferential surface 11 of the female tool 3.
In the case of the embodiment of the invention illustrated in the drawings, two rows of punches and punching bushes are arranged one beside the other along the circumference of the male tool and the female tool. A groove 12 provided in a circumferential area between and substantially aligned with the bores 6 for receiving the
REFERENCES:
patent: 3106859 (1963-10-01), Huffman
patent: 3194095 (1965-07-01), Buck et al.
patent: 3205744 (1965-09-01), Huck
patent: 3381560 (1968-05-01), Mages
patent: 3813977 (1974-06-01), Hibbing et al.
patent: 4108033 (1978-08-01), Bembenk
patent: 4548113 (1985-10-01), Topperwien et al.
patent: 4613321 (1986-09-01), Kesten
patent: 4688459 (1987-08-01), Osborn et la.
Rada Rinaldi
Schober GmbH Werkzeug - und Maschinenbau
Watts Douglas D.
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