US 4,450,039 A · Web splicing apparatus

Abstract

A splicing head for an automatic zero-speed web splicing machine is disclosed in which the end of a new roll of web material can be prepared for splicing directly on resilient nip rollers which are used by the machine to perform the splicing operation. In particular, the splicing head includes a knife carriage through which the web material passes and which can be moved transversely to the web travel direction under control of a cam and lever arrangement to introduce a predetermined loop of slack into the web material. The action of the cam and lever mechanism also positions a serrated preparation blade mounted on cantilever arms in front of the nip rollers for squarely trimming the edge of the web material. After the web material has been trimmed the preparation blade can be moved by the cam and lever arrangement to an out-of-the-way position to allow preparation of the web material and to prevent interference with the splicing machine as the web material runs through the machine after the splice has been made.

Claims26

Dependent claims

In web splicing apparatus having a ready roll of web material and an expiring roll of web material, a pair of resilient nip rollers operable to splice the leading edge of web material from said ready roll to the trailing edge of web material from said expiring roll, an idler roller to guide said leading edge to one of said nip rollers, and means operable during splice preparation and a splicing operation for holding and trimming said leading edge adapted to become engaged with either of said nip rollers, the improvement comprising:

means for positioning said one nip roller in a splice preparation position and for holding said one nip roller in a splicing position rotated from said splice preparation position,
means located between said idler roller and said one nip roller, said means being operable during splice preparation for drawing a slack loop of web material of precise, predetermined length between said idler roller and said one nip roller so that sad one nip roller can be rotated to said splicing position and during a splicing operation there is substantially no slack in said web material between said idler roller and said one nip roller.

Web splicing apparatus comprising

a ready roll of web material;
an expiring roll of web material
a pair of nip rollers operable to splice the leading edge of web material from said ready roll to the trailing edge of web material from said expiring roll;
an idler roller to guide said leading edge to one of said nip rollers;
means operable during splice preparation and a splicing operation for holding said leading edge on said one nip roller;
means for positioning said one of said nip rollers in a splice preparation and for positioning said one nip roller in a splicing position rotated from said splice preparation position;
a movable carriage located between said idler roller and said one nip roller and having a slot therein through which said web material passes and means operable during splice preparation for moving said carriage in a direction transverse to said web movement for drawing a slack loop of web material of precise, predetermined length between said idler roller and said one nip roller so that said one nip roller can be rotated to said splicing position and during a splicing operation there is substantially no slack in said web material between said idler roller and said one nip roller;
a trimming blade for trimming the leading edge of said ready roll during splice preparation;
and
means operable to position said trimming blade in front of either nip roller during splice preparation in a position so as to allow said leading edge to be ripped off against said blade.

7 more elements

Web splicing apparatus comprising

a ready roll of web material;
an expiring roll of web material;
a pair of resilient nip rollers operable to splice the leading edge of web material from said ready roll to the trailing edge of web material from said expiring roll;
a first idler roller to guide said leading edge to one of said nip rollers;
a second idler roller to guide said trailing edge from the other of said nip rollers;
means for holding said one nip roller in a splice preparation position and for holding said one nip roller in a splicing position rotated from said splice preparation position;
a first movable carriage located between said first idler roller and said one nip roller and having a slot therein through which said web material passes;
means operable during splice preparation for moving said first movable carriage in a direction transverse to said web movement for drawing a slack loop of web material of precise, predetermined length between said first idler roller and said one nip roller so that when said one nip roller is rotated from said splice preparation position to said splicing position and during a splicing operation there will be substantially no slack in said web material between said first idler roller and said one nip roller;
a second movable carriage located between said second idler roller and said other nip roller and having a slot therein through which web material passes;
a web severing knife located in said second movable carriage;
means for operating said knife to sever the web from said expiring roll of said web material after a splice has been made;
a trimming blade for trimming the leading edge of said ready roll during splice preparation;
and
means operable to position said trimming blade in front of either nip roller during splice preparation in a position so as to allow leading edge to be ripped off against said blade.

11 more elements

Dependencies are inferred from the claim text.

Web splicing apparatus

Life of this patent

Web splicing apparatus

Life of this patent

Abstract

Claims26