Method of and apparatus for locating the ends of webs
AssigneeAgfa-Gevaert
InventorsBernhard Lorenz, Christian Richter, Rainer Tuercke
Life of this patent
Estimating the term…
Abstract
The trailing end of a web of photosensitive material which is being unwound from a core in a cassette is connected to the core by an elongated strip. A monitoring device is placed adjacent the path of movement of the web from the core to the nip of two advancing rolls, and the monitoring device is activated as soon as it detects the strip. The motor for the advancing rolls is driven for an interval of time and at a speed such that, when the monitoring device detects the trailing end of the strip, the web is advanced through a predetermined distance to locate its trailing end at a splicing station where the trailing end of the web is to be spliced with the leader of a next-following web.
Claims18
A method of locating a trailing end of an elongated flexible strip having a leader affixed to a trailing end of an elongated flexible web of photosensitive material which is wound onto a rotary carrier separably connected to the trailing end of the strip, comprising the steps of unwinding successive increments of the web from the carrier and advancing the unwound increments along a predetermined path;
- positioning next to a predetermined portion of said path a signal generating monitoring device which is activatable to detect the trailing end of the strip;
- and activating the monitoring device upon advancement of the leader of the strip at least into said portion of said path.
Apparatus for locating a trailing end of an elongated flexible strip having a leader affixed to a trailing end of a web of photosensitive material which is wound onto a rotary carrier separably connected to the trailing end of the strip, comprising means for rotatably supporting the carrier;
- means for unwinding successive increments of the web from the carrier and for advancing the unwound increments along a predetermined path;
- and a monitoring device adjacent a predetermined portion of said path and including means for generating signals, said signal generating means being activatable to generate a signal in response to detection of the trailing end of the strip in said portion of said path and said signal generating means being activated in response to advancement of the leader of the strip at least into said portion of said path.
Dependencies are inferred from the claim text.