Measuring and controlling wound-in tension for web winding machines

Claim 3

The method of controlling the wound-in tension on a web winding machine as described in claim 1 including the steps of: recording the adjusted instantaneous nip pressure, utilizing in subsequent winding operations, the recorded nip pressure to directly adjust the nip pressure between the driving and driven drums.

Claim 4

In a web winding machine including a winder drum and a web roll being urged against the winder drum to form a nip therebetween wherein a web is passed through the nip for being wound on the web roll, a wound-in tension control device comprising: a web roll about which a web is to be wound, said winder drum forming a nip with the web roll, a measuring roll spaced from the web and the turning rolls, a web traversing a path which passes from a position against said winder drum to and through said nip, then to a loop around the measuring roll, from the loop to and around said web roll and thereafter returning through said nip, the path of the web from the loop to and around the web roll being free of any additional nips, sensing means for monitoring the tension applied to the measuring roll by the moving web, and control means for adjusting the nip pressure in accordance with the deviation of the output of said sensing means from a prescheduled norm.

Claim 5

In a web winding machine including a winder drum and a web roll being urged against the winder drum to form a nip therebetween wherein a web is passed through the nip for being wound on the web roll, a wound-in tension control device comprising: a web roll about which a web is to be wound, said winder drum forming a nip with the web roll, a measuring roll spaced from the web and the turning rolls, a web traversing a path which passes from a position against said winder drum to and through said nip, then to a loop around the measuring roll, from the loop to and around said web roll and thereafter returning through said nip, the path of the web from the loop to and around the web roll being free of any additional nips, sensing means for monitoring the tension applied to the measuring roll by the moving web, and control means for adjusting the nip pressure in accordance with the deviation of the output of said sensing means from a prescheduled norm.

Claim 6

A wound-in tension control device in accordance with claim 3 wherein a turning roll is positioned against the web to urge the portion of the web leaving the measuring roll into a path which is substantially parallel to the path of the web approaching the measuring roll whereby the sensitivity of said sensing means is maximized for detecting variations in the tension of the web.

Claim 7

A wound-in tension device in accordance with claim 3 wherein said sensing device includes a load cell having a signal output indicative of the tension of the measuring roll by the moving web, a preset device for generating a prescheduled signal indicative of the desired Loading of the measuring roll by the moving web, a difference signal generator, means for applying the output signal from the load cell and the prescheduled signal to said difference signal generator, actuator means utilizing the output of the difference signal generator to regulate nip pressure between the winder drum and the web roll.

Claim 8

A web winding machine comprising: a winder drum, a web roll, pressure means urging said web roll against said winder drum and forming a nip thereby such that said web roll is driven by said winder drum, a web passing around a portion of the surface of said winder drum through the nip and around the web roll, said web having a loop formed intermediate the nip and the initial point of wrap of the web on the web roll, said web roll then returning through said nip, for being wound on said web roll the path of the web from the loop to and around the web roll being free of any additional nips, a measuring roll inserted in the loop and having a surface portion thereof urged against the tension of the moving web, load sensing means coupled to the measuring roll and generating a signal indicative of the tension of the web on the measuring roll, control means, means for presetting a signal into the control means indicative of the instantaneous desired tensioning of the web on the measuring roll, means coupling the output of the load sensing means into said control means, said control means generating an error signal indicative of the deviation of the output of said load sensing means from said preset signal, transducer means utilizing said error signal to adjust the nip pressure between the winder drum and web roll.

Claim 9

A web winding machine comprising: a winder drum, a web roll, pressure means urging said web roll against said winder drum and forming a nip thereby such that said web roll is driven by said winder drum, a web passing around a portion of the surface of said winder drum through the nip and around the web roll, said web having a loop formed intermediate the nip and the initial point of wrap of the web on the web roll, said web roll then returning through said nip, for being wound on said web roll the path of the web from the loop to and around the web roll being free of any additional nips, a measuring roll inserted in the loop and having a surface portion thereof urged against the tension of the moving web, load sensing means coupled to the measuring roll and generating a signal indicative of the tension of the web on the measuring roll, control means, means for presetting a signal into the control means indicative of the instantaneous desired tensioning of the web on the measuring roll, means coupling the output of the load sensing means into said control means, said control means generating an error signal indicative of the deviation of the output of said load sensing means from said preset signal, transducer means utilizing said error signal to adjust the nip pressure between the winder drum and web roll.

Claim 10

A web winding machine in accordance with claim 6 wherein said transducer means comprises a rider roll and means responsive to said error signal for urging said rider roll against the surface of the web roll to regulate the nip pressure between the winder drum and the web roll.

Claim 11

A web winding machine comprising: a winder drum, a web roll, pressure means urging said web roll against said winder drum and forming a nip thereby such that said web roll is driven by said winder drum, a web passing around a portion of the surface of said winder drum, through the nip and around the web roll, said web having a loop formed intermediate the nip and the initial point of wrap of the web on the web roll for being wound on said web roll and then returning through said nip, the path of the web from the loop to and around the web roll being free of any additional nips, a measuring roll inserted in the loop and having a surface portion thereof urged against the tension of the moving web, load sensing means coupled to the measuring roll and generating a signal indicative of the tension of the web on the measuring roll, control means, means for presetting a signal into the control means indicative of the instantaneous desired tensioning of the web on the measuring roll, means coupling the output of the load sensing means into said control means, said control means generating an error signal indicative of the deviation of the output of said load sensing means from said preset signal, counter means for measuring the distance traveled by the web during the course of the winding of the web on the web roll, a program recorder means, first transducer means utilizing said error signal to adjust the nip pressure between the winder drum and the web roll, second transducer means utilizing said error signal to generate a continuous record at said program recorder means of the adjusted nip pressure, and means for coupling the output of said counter means to said program recorder means for registering the length of web wound on the web roll substantially simultaneously with the registering of the adjusted nip pressure at said program recorder means.

Claim 12

A web winding machine comprising: a winder drum, a web roll, pressure means urging said web roll against said winder drum and forming a nip thereby such that said web roll is driven by said winder drum, a web passing around a portion of the surface of said winder drum, through the nip and around the web roll, said web having a loop formed intermediate the nip and the initial point of wrap of the web on the web roll for being wound on said web roll and then returning through said nip, the path of the web from the loop to and around the web roll being free of any additional nips, a measuring roll inserted in the loop and having a surface portion thereof urged against the tension of the moving web, load sensing means coupled to the measuring roll and generating a signal indicative of the tension of the web on the measuring roll, control means, means for presetting a signal into the control means indicative of the instantaneous desired tensioning of the web on the measuring roll, means coupling the output of the load sensing means into said control means, said control means generating an error signal indicative of the deviation of the output of said load sensing means from said preset signal, counter means for measuring the distance traveled by the web during the course of the winding of the web on the web roll, a program recorder means, first transducer means utilizing said error signal to adjust the nip pressure between the winder drum and the web roll, second transducer means utilizing said error signal to generate a continuous record at said program recorder means of the adjusted nip pressure, and means for coupling the output of said counter means to said program recorder means for registering the length of web wound on the web roll substantially simultaneously with the registering of the adjusted nip pressure at said program recorder means.

Claim 13

A web winding machine in accordance with claim 2 wherein said recoRder means comprises an X-Y recorder which records the adjusted nip pressure as a continuous curve on an X-Y chart.