Cutting – Interrelated tool actuating means and means to actuate work... – Work clamp
Patent
1987-07-10
1989-03-28
Yost, Frank T.
Cutting
Interrelated tool actuating means and means to actuate work...
Work clamp
83140, 83456, 83563, 83564, 83690, 83914, B26D 701
Patent
active
048153486
DESCRIPTION:
BRIEF SUMMARY
The present invention relates generally to apparatus for trimming a flanged end of a tubular article and has particular, but not exclusive, application for trimming a flanged end of a plastics body for a food or beverage container, prior to double-seaming the flanged end to a metal end closure.
In order reliably to make an effective leak-proof double seam between the flanged end of a container body and an end closure, the flanged end must be provided with an accurately trimmed edge. Conventionally, the necessary degree of accuracy has been achieved by mounting a punch for vertical movement on the pillars of a standard pillar and die set. The punch is mounted on an upper beam which is reciprocated along two or more pillars toward and away from the die beneath it. To achieve the accurate alignment required between the punch and the die, a massive framework including the pillars is required to achieve sufficient rigidity for accurate alignment to be possible. However, these traditional pillar and die sets are extremely expensive; they are massive and access for the article is often restricted. One object of the present invention is to enable the required degree of accuracy to be provided for a flange trimming operation on a plastics container body without the need for the massive structure of the pillar and die sets which have been used hitherto.
For a tube having a flanged end to be correctly positioned in an annular die which must necessarily have a smaller internal diameter than the untrimmed flange, one of two conditions must be provided. Either there must be sufficient space provided in the apparatus for the tube to be fed axially into the die until the flange reaches the die, or the die must be formed in segments which are separable and movable between a closed position in which the die is formed, and an open position in which the segments are spaced from one another. The invention relates to apparatus of the second type.
Accordingly, the present invention provides apparatus for trimming a flanged end of a tubular article, comprising a punch and a die, the punch and the die being relatively movable along the axis of the article and on such relative movement cooperating to sever and thereby trim the flanged end of the article at a required diameter; the die being formed of a plurality of segments which are movable between a closed position in which the die is formed and an open position in which the segments are spaced from one another, and the apparatus including aligning means for the punch and die comprising a radially outwardly facing surface on the die and a radially inwardly facing surface carried by the punch, the two surfaces being brought into engagement by relative axial movement of the punch and die towards one another so as to hold the segments of the die securely together and retain the punch and die in correct alignment at least while the flanged end is being trimmed.
An advantageous feature of the split die arrangement of the described embodiments is the provision of further surfaces which are mutually engageable to provide a lateral alignment of the punch and die which is in addition to the alignment provided by the first-mentioned surfaces when the punch is operated. The further surfaces are brought into engagement when the die segments are moved from their open to their closed position and so provide a rough or initial alignment of the punch and die which is in advance of the alignment provided by the first-mentioned surfaces.
In accordance with one embodiment of the invention, the die segments are attached to respective pivotally mounted members so as to follow an arcuate path in moving between their open and closed positions, the said further surface of the die being provided by the said pivotally mounted members.
In a second embodiment, the die segments may be arranged to follow a linear path in moving between their open and closed positions.
In either case, the punch or the die may have an associated surface arranged to engage the article and to hold and locate the same for the said
REFERENCES:
patent: 2023200 (1935-12-01), Huff et al.
patent: 3465931 (1969-09-01), Rupert
patent: 3863529 (1975-02-01), Bolen
patent: 3911556 (1975-10-01), Pierce
patent: 3933071 (1976-01-01), Doring
patent: 3971275 (1976-07-01), Mach
Ashbolt Mark T.
Mann, deceased Thomas G.
Watson Martin J.
Metal Box p.l.c.
Phan Hien H.
Yost Frank T.
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