Tool changing – Including machine tool or component – Reciprocating tool machine tool
Reexamination Certificate
1998-07-16
2001-03-13
Briggs, William (Department: 3722)
Tool changing
Including machine tool or component
Reciprocating tool machine tool
C072S446000, C083S563000, C483S029000
Reexamination Certificate
active
06200246
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention concerns a gripper element for a punch or a die of a punching machine. In particular, the invention concerns a gripper element for an arm of a changeover device of a turret punching machine.
Different kinds of turret punching machines are known, provided with a device for exchanging the punch and die pair between the turrets and a magazine of such pairs. In one known machine, each end of the changeover arm has a gripper element formed from two leaf springs, each having a rib for snap-engaging a channel extending from the punch or the die.
This gripper element has the disadvantage of requiring a pair of pneumatic pistons, one for removing the punch or die from the leaf springs, and the other for removing them from their seat and re-engaging them with the leaf springs. Furthermore, the elastic thrust of the leaf springs does not allow the punch or die to be rigidly secured to the gripper element. Finally, this gripper element does not exhibit any angular reference for holding the punch or die.
In another known machine, the gripper element is operated by an axial pneumatic cylinder and comprises two rigid jaws pivoted to the rod of the pneumatic piston. The two jaws are rotated in a mutually opposite direction by means of a fixed cam profile, and are adapted to engage two diametrically-opposed cavities located outside the punch or in an axial hole of the die.
This gripper element has the disadvantage of requiring two different types of jaws for the punch and the die. Furthermore, the connection between two diametrically-opposed cavities does not ensure such a reference as to connect the jaws firmly to the punch or the die during the movement of the changeover arm.
SUMMARY OF THE INVENTION
The object of the invention is to produce a gripper element for a punch or die of a punching machine, which is both very simple and very reliable to operate, and which eliminates the disadvantages described above in relation to the known gripper elements.
This object is achieved by a gripper element for a punch or a die according to the invention, for a punching machine provided with a changeover device for a punch-die pair, including a pair of jaws operable by a common actuator, and characterised in that the said jaws are moveable so as to engage corresponding pairs of channels in a flange of the said punch or the said die.
REFERENCES:
patent: 3678562 (1972-07-01), Leibinger
patent: 4486941 (1984-12-01), Scott et al.
patent: 4587716 (1986-05-01), Bytow
patent: 4649622 (1987-03-01), Scott
patent: 4843704 (1989-07-01), Sakamoto
patent: 4878288 (1989-11-01), Messner
patent: 5224915 (1993-07-01), Kilian
patent: 5295938 (1994-03-01), Jilsen
patent: 5346454 (1994-09-01), Hayashi
patent: 5545116 (1996-08-01), Seto
patent: 5913760 (1999-06-01), Kamada et al.
patent: 2240293 (1991-04-01), None
patent: 9500267 (1995-01-01), None
Briggs William
Ladas & Parry
Rainer S.r.l.
LandOfFree
Gripper element for a punch or a die of a punching machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gripper element for a punch or a die of a punching machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gripper element for a punch or a die of a punching machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2480084