Unwinder of reels of web material
AssigneeA.Celli Nonwovens S.P.A.
InventorGiuseppe Acciari
Life of this patent
Estimating the term…
Abstract
An unwinder of reels of web material wound around winding spindles (A), includes a unwinding station (13) with at least one unwinding member (23) to rotate a reel (B) that is located in the unwinding station and feed the web material toward a delivery path (E). Lifting members (51, 53) are provided to lift a spindle of a first exhausted reel from the unwinding station (13), in a removal position (PR). An insertion member (7; 33) is further provided to insert a second reel into the unwinding station (13). A pressing member (61) is arranged to press the web material coming from the first reel in removal position (PR) against the second reel in the unwinding station (13).
Claims21
An unwinder of reels of web material wound around winding spindles, comprising:
- an unwinding station with at least one unwinding member to rotate a reel that is located in said unwinding station and feed the web material toward a delivery path;
- lifting members to lift a spindle of a first exhausted reel from said unwinding station in a removal position;
- an insertion member to insert a second reel into said unwinding station;
- a pressing member to press the web material coming from the first reel in the removal position against the second reel in the unwinding station;
- and
- a severing member arranged and controlled to sever the web material of said first reel in an area comprised between the removal position and said pressing member, wherein said pressing member is arranged and controlled to press the web material of the first reel against a lateral surface of the second reel so as:
- to generate friction between the lateral surface of the second reel and the web material, such that rotation of the second reel and a pressure exerted by the pressing member causes the first reel to be drawn into rotation and to deliver by pulling the web material remaining around the first reel, such that a residual web material is drawn from the first reel;
- and to provide pressure to cause adhesion of the web material of the first reel to the web material of the second reel, by means of a double-sided adhesive tape interposed between the two web materials, wherein a braking system is associated with said lifting members to brake the spindle of said first reel located in the removal position.
An unwinder of reels of web material wound around winding spindles, the unwinder comprising:
- an unwinding station with at least one unwinding member to rotate a reel that is located in said unwinding station and feed the web material toward a delivery path;
- lifting members to lift a spindle of a first exhausted reel from said unwinding station in a removal position;
- an insertion member to insert a second reel into said unwinding station;
- a pressing member to press the web material coming from the first reel in the removal position against the second reel in the unwinding station;
- and
- a severing member arranged and controlled to sever the web material of said first reel in an area comprised between the removal position and said pressing member, wherein said pressing member is arranged and controlled to press the web material of the first reel against a lateral surface of the second reel so as:
- to generate friction between the lateral surface of the second reel and the web material, such that rotation of the second reel and a pressure exerted by the pressing member causes the first reel to be drawn into rotation and to deliver by pulling the web material remaining around the first reel, such that a residual web material is drawn from the first reel;
- and to provide pressure to cause adhesion of the web material of the first reel to the web material of the second reel, by means of a double-sided adhesive tape interposed between the two web materials;
- a positioning and standby area of reels to be unwound, in which members for rotation for angular positioning of the reels standing by, and a device for angular positioning, are provided, wherein a unit for slow rotation of the reel standing by is arranged in said positioning and standby area.
A method for replacing a first reel in a final stage of unwinding with a second reel in an unwinder of reels of web material wound around winding spindles, the method comprising the steps of:
- interrupting or slowing down unwinding of a first reel located in an unwinding station;
- lifting the first reel in the final stage of unwinding and a respective winding spindle from the unwinding station in a removal position, forming a portion of web material between the first reel in the removal position and a delivery path;
- inserting a second reel in the unwinding station;
- pressing the web material of the first reel against an outer surface of the second reel via a pressing member during a rotation step of the second reel;
- starting rotation of the second reel and generating a pulling force on the web material of the first reel by friction between the web material of the first reel and the outer surface of the second reel while the first reel is braked, so as to unwind by pulling the web material of the first reel located in the removal position until said web material adheres to the leading edge of the second reel;
- interrupting with a severing member the web material between the first reel located in the removal position and a point of adhesion to a leading edge of the second reel.
Dependencies are inferred from the claim text.