摘要:
A duplicating, printing or recording surface is produced by attaching a strip (10) of magnetic or other web material to a support such as a drum (20) or flat support element provided with a layer (22) of low durometer elastomer, the strip of material and the elastomeric material being mutually adherent. With the strip of material wrapped circumferentially around the drum, a sharp knife is used to cut the magnetic material and form a precise butt joint (35,36), diagonal or straight, with a minimal gap. The strip of material forms a secure bond with the low durometer elastomeric layer because of the inherent mutual adherence between the two materials, without the need for an intervening adhesive material. A compliant magnetic drum of this type has a low radial stiffness and a high circumferential stiffness which are well suited for a master recording drum in an anhysteretic duplicating apparatus.
摘要:
A web spooling system has a chuck (22) that is coupled to a spool for rotating the spool (14) to wind a length of web material (12) onto the spool. Torque is transmitted from a drive shaft (32) to the chuck through a spring (34) coupled to the shaft and the chuck. A transducer (36) measures the angular relationship between the shaft and the chuck throughout a range of relative angular positions therebetween. The transudcer provides a signal indicative of that angular relationship, and the signal is transmitted to a controller (38) that regulates the torque applied by the drive shaft. The position of the chuck relative to the drive shaft during web winding operation is a function of tension transients in the web. Since the system adjusts the torque of the drive shaft as a function of the angular relationship of the chuck and drive shaft, the system is effective to reduce tension transients in the web being wound onto the spool.
摘要:
A duplicating, printing or recording surface is produced by attaching a strip (10) of magnetic or other web material to a support such as a drum (20) or flat support element provided with a layer (22) of low durometer elastomer, the strip of material and the elastomeric material being mutually adherent. With the strip of material wrapped circumferentially around the drum, a sharp knife is used to cut the magnetic material and form a precise butt joint (35,36), diagonal or straight, with a minimal gap. The strip of material forms a secure bond with the low durometer elastomeric layer because of the inherent mutual adherence between the two materials, without the need for an intervening adhesive material. A compliant magnetic drum of this type has a low radial stiffness and a high circumferential stiffness which are well suited for a master recording drum in an anhysteretic duplicating apparatus.
摘要:
A web spooling system has a chuck (22) that is coupled to a spool for rotating the spool (14) to wind a length of web material (12) onto the spool. Torque is transmitted from a drive shaft (32) to the chuck through a spring (34) coupled to the shaft and the chuck. A transducer (36) measures the angular relationship between the shaft and the chuck throughout a range of relative angular positions therebetween. The transudcer provides a signal indicative of that angular relationship, and the signal is transmitted to a controller (38) that regulates the torque applied by the drive shaft. The position of the chuck relative to the drive shaft during web winding operation is a function of tension transients in the web. Since the system adjusts the torque of the drive shaft as a function of the angular relationship of the chuck and drive shaft, the system is effective to reduce tension transients in the web being wound onto the spool.