Rotary die cutters
AssigneeCorfine Inc.
InventorsBarry J. O'Connor, Robert B. Vigder
Life of this patent
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Abstract
A removable and replaceable cover assembly for use on an anvil roll in a rotary die cutter in combination with a die roll equipped with non-serrated cutting blades consists essentially of inner and outer tubular layers of elastomeric material of different degrees of hardness, the outer layer being substantially harder than the inner layer. Since this tubular cover must be mounted on an anvil roll by relative endwise movement, the cover is disclosed in combination with a rotary die cutter having special provision for temporary removal, recovering and remounting of the anvil roll.
Claims20
A rotary die cutter comprising:
- (a) a frame,
- (b) a die roll mounted for rotation in said frame and having on the outer surface thereof blade means having cutting edges,
- (c) an anvil roll including shaft means at each end thereof by which said anvil roll is mounted for rotation in said frame below said die roll,
- (d) means forming detachable connections between said anvil roll and said shaft means, and
- (e) means operative following detachment of said connections for effecting relative axial movement of said anvil roll and said shaft means to release said anvil roll for lateral movement out of said frame.
The method of covering a rotary die cutter anvil roll of predetermined outer diameter which comprises the steps of:
- (a) heating a circumferentially continuous tubular cover of elastomeric material having a room temperature inner diameter less than said anvil roll outer diameter,
- (b) continuing said heating until said inner diameter is greater than said anvil roll outer diameter,
- (c) mounting said heated cover on said anvil roll by relative lengthwise movement thereof, and
- (d) cooling said heated cover to effect shrink fitting thereof on said anvil roll.
In a rotary die cutter including a die roll equipped with blade means having non-serrated cutting edges, and an anvil roll cooperating with said die roll to cut sheet material passing therebetween, the improvement comprising a removable and replaceable cover assembly on said anvil roll consisting essentially of:
- (a) a circumferentially continuous radially outer tubular layer consisting essentially of elastomeric material of a relatively high degree of hardness, and
- (b) a circumferentially continuous radially inner tubular layer consisting essentially of elastomeric material of a predetermined relatively low degree of hardness.
A method of recovering an anvil roll of predetermined outer diameter which is initially covered by an old anvil roll cover and which is mounted between end frames of a rotary die cutter, said method comprising the steps of:
- (1) temporarily supporting said anvil roll intermediate said end frames;
- (2) dismounting said anvil roll from said end frames;
- (3) removing said old anvil roll cover from said anvil roll;
- (4) heating a new anvil roll cover having a continuous circumferential configuration and a room temperature inner diameter slightly less than said anvil roll outer diameter;
- (5) expanding said new anvil roll cover by continuing said heating until said inner diameter exceeds said anvil roll outer diameter;
- (6) inserting said anvil roll into said new anvil roll cover while said new anvil roll cover is expanded as aforesaid;
- (7) causing said new anvil roll cover to cool to room temperature and become shrink fitted about said anvil roll;
- and
- (8) remounting said anvil roll between said end frames with said new anvil roll cover fitted thereon.
A removable and replaceable cover assembly for use on an anvil roll in a rotary die cutter, especially in combination with a die roll equipped with blade means having non-serrated cutting edges, consisting essentially of:
- (a) a circumferentially continuous radially outer tubular layer composed of elastomeric material of a relatively high degree of hardness in the order of Shore D 70, and
- (b) a circumferentially continuous radially inner tubular layer composed of elastomeric material of a relatively low degree of hardness in the order of Shore A 80.
A removable and replaceable cover assembly for use on an anvil roll in a rotary die cutter, especially in combination with a die roll equipped with blade means having non-serrated cutting edges, consisting essentially of:
- (a) a circumferentially continuous radially outer tubular layer composed of elastomeric material of a relatively high degree of hardness, and
- (b) a circumferentially continuous radially inner tubular layer composed of elastomeric material of a relatively low degree of hardness;
- said cover assembly having a predetermined internal diameter at room temperature and thermal expansion characteristics such that upon heating to a temperature of 210 deg F., said roll cover has an expanded internal diameter greater than said predetermined internal diameter by a sufficient amount to enable reception of an anvil roll having an outer diameter intermediate said predetermined internal diameter and said expanded internal diameter.
Dependencies are inferred from the claim text.