Tape cartridge and driving system having rotation detection unit for drive roll to maintain constant contact pressure with the capstan roll

A tape cartridge and driving system including a capstan roll, which includes a cartridge member having a cover member, a base plate, and a pair of tape reels on which a magnetic tape is wound, comprising:

• a driving device comprising:
• a drive roll rotatably housed within the cartridge member and adapted to be driven by engagement with said capstan roll;
• an endless driving belt engaged with portions of the magnetic tape on the tape reels and with said drive roll, for driving the magnetic tape;
• rpm detection enabling means for indicating the rotation speed of said drive roll, said rpm detection enabling means including:
• a marker formed on a surface of the drive roll;
• and
• a detection window formed in the cover at a position opposed to said drive roll through which movement of said marker will be optically detected;
• motor means for driving and positioning said capstan roll;
• a photo sensor which detects the movement of the marker of said rpm detection enabling means;
• and
• motor driving controller means, responsive to said photo sensor and to the operation of the motor means, which corrects the rotational speed of the motor means which drives the capstan roll and adjusts the contact pressure between the capstan roll and the drive roll to ensure intimate contact therebetween.

A tape cartridge and driving system including a capstan roll for driving a drive roll, comprising:

• a main cartridge member having a cover member and a base plate, said main cartridge member housing a pair of tape reels on which a magnetic tape is wound and adapted to travel along a front surface of the cover member, while being transferred from one reel to the other;
• a driving device comprising:
• a drive roll, for driving said transfer of the tape, rotatably housed within said main cartridge member and exposed via an opening formed in the cover member so as to be placed in drive engagement with said capstan roll;
• an endless driving belt engaged with portions of the magnetic tape on the tape reels, and with said drive roll for driving the magnetic tape:
• and
• rpm detection enabling means formed and movable with said drive roll for enabling a detection of the rotating state of the drive roll;
• wherein said driving device further comprises:
• motor means for driving and positioning said capstan roll;
• a photo sensor which detects movement of the rpm detection enabling means;
• and
• motor driving controller means, responsive to said photo sensor and to the operation of the motor means, which corrects the rotational speed of the motor means which drives the capstan roll and adjusts the contact pressure between the capstan roll and the drive roll to ensure intimate contact therebetween.