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Tape Drive Threading Mechanism

IP.com Disclosure Number: IPCOM000049628D
Original Publication Date: 1982-Jun-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 3 page(s) / 54K

Publishing Venue

IBM

Related People

Hu, PY: AUTHOR [+3]

Abstract

A hinged arm assembly can be used to pull a tape from a supply reel and thread it past transducers and tape guides into a take up reel for further unreeling of the tape from the supply reel. The hinged arm assembly is connected at one end to a rotatable threading shaft. The end of the hinged arm is guided by a cam surface that defines the path of the tape. An idler wheel is automatically inserted between the drive shaft and the threading shaft for the reverse operation by tripping a Y bracket that offcenters a spring to urge the idler wheel into contact with the drive shaft after a rotation of the threading shaft into the winding position.

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Tape Drive Threading Mechanism

A hinged arm assembly can be used to pull a tape from a supply reel and thread it past transducers and tape guides into a take up reel for further unreeling of the tape from the supply reel. The hinged arm assembly is connected at one end to a rotatable threading shaft. The end of the hinged arm is guided by a cam surface that defines the path of the tape. An idler wheel is automatically inserted between the drive shaft and the threading shaft for the reverse operation by tripping a Y bracket that offcenters a spring to urge the idler wheel into contact with the drive shaft after a rotation of the threading shaft into the winding position.

As shown in the figure, an arm 1 includes two sections 2 and 3 hinged at point 4 and connected to a driven wheel 5 at point A. The arm 1 also includes a connecting pin 6, shown in position for connecting to the end of the tape from supply reel 7. The arm 1 and the driven wheel 5 are journaled to an L-bracket 8 that is connected to a solenoid 9 through the piston 10 of the solenoid. A continuously rotating drive shaft 11 rotates the driven reel 5 either directly or through an idler wheel 12. Idler wheel 12 is journaled to an arm 13 through a pin 14 that also fits into a slot 15 formed in the L-bracket 8. Arm 13 is pivoted at point 16 to move between the two positions shown in the figure, one shown in solid lines and one shown in dotted lines. The free end of the arm 13 is connected to a spring 17 which has its other end connected to a Y-bracket 18. The Y-bracket is pivoted at point 19 into its two positions, as defined by the solid and dotted lines. The rotation of the Y-bracket 18 is limited by pins 20 and 21. The Y-bracket 18 is rotated into its positions by a pin (not shown) on the driven wheel 5.

In operation, the supply reel 7 is positioned such that the end of its tape is in contact with the pin 6 of arm 1. At this time the L-bracket 8 is positioned such that the center of rotation of the driven wheel 5 is located at point A and the arm 1 is positioned as shown in the solid line. To start the threading operation, the solenoid 9 is activated which in turn moves its piston 10 toward the solenoid 9, causing the L-bracket 8 to be positioned with the center of rotation of the driven reel 5 at position B. This action causes the arm 1 to pull the pin 6 and the end of...