# US 5,701,790 A · Upper tool for a press

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- Number: US 5,701,790 A
- Document ID: US5701790A
- Status: Granted
- Kind: A
- Application number: 08/628,857
- Filed: 1996-04-05
- Granted: 1997-12-30
- Earliest claimed: 1993-07-28
- Assignees: Amada Metrecs Company, Limited
- Inventors: Hiroshi Saito
- Web page: https://patentgrep.com/patent/US5701790A

## CPC

- B26D 7/1818: {by pushing out}
- B21D 28/12: Punching using rotatable carriers
- B21D 45/006: {Stripping-off devices}
- Y10T 83/215: Carried by moving tool element or its support
- Y10T 83/2159: By spring means
- B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04)
- B21D: WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (working or processing of wire B21F)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In an upper tool, a stripper plate (35) is disposed movably up and down at a lower end portion (13a) of a punch guide (13) for housing a punch (27) also movably up and down, via a shock damping member (33). Further, the shock damping member (33) is formed into an annular body disposed so as to enclose an annular gap (X) formed between the lower end portion (13a) of the punch guide (13) and the upper surface (65) of the stripper plate (35). The upper tool can reduce noise sound generated during punching processing, and further prevent chips produced during punching processing from adhering onto the workpiece and the shock damping member, thus protecting the workpiece from being scratched by the chips and further improving the life time of the shock damping member.

## Claims

### Claim 1

An upper tool for a punch press which includes an upper tool holding member, comprising:
a unitary punch guide adapted to be mounted on the upper tool holding member so as to be movable up and down, the punch guide having a lower end portion, the lower end portion having a lower surface, the punch guide is supported by the upper tool holding member through a first elastic member;
a shock damping member releasably fixed directly on the lower end portion of the unitary punch guide;
a stripper plate, for coming in contact with a workpiece and pushing the workpiece to strip the workpiece from the punch when the punch retracts, releasably fixed directly on the shock damping member, the stripper plate having an upper surface; and
an air gap between the lower surface and the upper surface, the air gap being dimensioned so that the air gap is equal to the maximum deformation of the damping member and the upper surface collides with the lower surface if the shock damping member is deformed excessively.

### Claim 2 (depends on 1)

The upper tool of claim 1, wherein a second elastic member is interposed between a punch body and the punch guide, and the elastic constant of the second elastic member is greater than that of the first elastic member.

### Claim 3

An upper tool for a punch press which includes an upper tool holding member, comprising:
a unitary punch guide adapted to be mounted on the upper tool holding member so as to be movable up and down, the punch guide having a lower end portion, the lower end portion having a lower surface, the punch guide is supported by the upper tool holding member through a first elastic member;
a punch being inserted in the punch guide so as to be movable up and down;
a stripper spring being interposed between the punch and the punch guide for exerting downward force on the punch guide enough to retract the punch from a hole punched in a workpiece;
a shock damping member releasably fixed directly on the lower end portion of the unitary punch guide;
a stripper plate releasably fixed directly on the shock damping member for coming in contact with a workpiece and pushing the workpiece to strip the workpiece from the punch when the punch retracts, the stripper plate being fitted on an outer surface of the punch so as to be able to push a circumferential portion of the workpiece defining the hole punched in the workpiece, the stripper plate having an upper surface; and
an air gap between the lower surface and the upper surface, the air gap being dimensioned so that the air gap is equal to the maximum deformation of the damping member and the upper surface collides with the lower surface if the shock damping member is deformed excessively.

### Claim 4 (depends on 3)

The upper tool of claim 3, wherein a second elastic member is interposed between a punch body and the punch guide, and the elastic constant of the second elastic member is greater than that of the first elastic member.