Paper web threading apparatus for paper web handling machine

A paper web threading apparatus for use in a paper web handling machine, comprising:

• a paper web threading member disposed for traveling while carrying the paper web substantially along a paper web threading path;
• a driving means for driving the paper web threading member so as to have the paper web threading member travel;
• a first signal generator means associated with said paper web threading member for outputting a signal indicative of the absolute traveling speed of said paper web threading member;
• a processing means for receiving the signal outputted by the first signal generator means as an input thereof, processing the signal deriving a processed value corresponding to the traveling speed of the paper web threading member, comparing the processed value with a reference value preset in connection with the operating speed of the paper web handling machine when the paper web is threaded along its paper web threading path, and outputting an adjusting signal depending upon a difference between said processed value and said reference value;
• and
• an adjusting means for receiving the adjusting signal outputted by the processing means as an input thereof and controlling the driving means for adjusting the traveling speed of the paper web threading member so as to reduce said difference to zero.

A paper web threading apparatus for use in a paper web handling machine operating at a known operation speed, comprising:

• a paper web threading member detachably carrying a paper web through a predetermined paper web threading path across said paper web handling machine;
• a variable speed driving means associated with said paper web threading member for driving the latter at a controlled traveling speed;
• a traveling speed monitoring means associated with said paper web threading member for generating a traveling speed indicative signal having a frequency representative of the traveling speed of said paper web threading member;
• a control signal generator means for deriving a traveling speed of said paper web threading member on the basis of said traveling speed indicative signal and driving a control signal for controlling said variable speed driving means in order to adjust the traveling speed of said paper web threading member toward a target speed determined in relation to said known operation speed of said paper web handling machine.

A paper web threading apparatus for use in a paper web handling machine operating at a known operation speed, comprising:

• a paper web threading member detachably carrying a paper web through a predetermined paper web threading path across said paper web handling machine;
• a variable speed driving means associated with said paper web threading member for driving the latter at a controlled traveling speed;
• a traveling speed monitoring means associated with said paper web threading member for generating a periodic signal having a frequency corresponding to the traveling speed of said paper web threading member;
• a control signal generator means for deriving a traveling speed of said paper web threading member on the basis of said periodic signal and deriving a control signal for controlling said variable speed driving means in order to adjust the traveling speed of said paper web threading member toward a target speed determined in relation to said known operation speed of said paper web handling machine.

A paper web threading apparatus for use in a paper web handling machine comprising:

• a paper web threading member detachably carrying a paper web through a predetermined paper web threading path across said paper web handling machine;
• a variable speed driving means associated with said paper web threading member for driving the latter at a controlled traveling speed;
• a traveling speed monitoring means associated with said paper web threading member for generating a first periodic signal having a frequency corresponding to the traveling speed of said paper web threading member;
• an operation speed monitoring means associated with said paper web handling apparatus for generating a second periodic signal having a frequency corresponding to the operation speed of said paper web handling apparatus;
• a control signal generator means for deriving the traveling speed of said paper web threading member on the basis of said periodic signal and the operation speed of said paper web handling apparatus, and deriving a control signal for controlling said variable speed driving means in order to adjust the traveling speed of said paper web threading member toward a target speed determined in relation to said operation speed of said paper web handling machine.

A paper web threading apparatus for use in a paper web handling machine, comprising:

• a paper web threading member disposed for traveling while carrying the paper web substantially along a paper web threading path;
• a driving means for driving the paper web threading member so as to have the paper web threading member travel;
• a first signal generator means associated with said paper web threading member for generating a periodic signal having a frequency corresponding to the traveling speed of said paper web threading member;
• a processing means for receiving the signal outputted by the first signal generator means as an input thereof, processing the signal deriving a processed value corresponding to the traveling speed of the paper web threading member, comparing the processed value with a reference value preset in connection with the operating speed of the paper web handling machine when the paper web is threaded along its paper web threading path, and outputting an adjusting signal depending upon a difference between said processed value and said reference value;
• and
• an adjusting means for receiving the adjusting signal outputted by the processing means as an input thereof and controlling the driving means for adjusting the traveling speed of the paper web threading member so as to reduce said difference to zero.