초록 ▼

A training device which interactively guides a tennis racquet by exerting a towing force on a card which is connected to the tennis racquet. The device includes a vertically adjustable support connected with a guide pole fixed to a wall. A swivel arm is movably supported on the support and has a dis

A training device which interactively guides a tennis racquet by exerting a towing force on a card which is connected to the tennis racquet. The device includes a vertically adjustable support connected with a guide pole fixed to a wall. A swivel arm is movably supported on the support and has a distal end which suspends a ball therefrom. The cord extends along the swivel arm and the support, and one end thereof is connected to the racquet through a stirrup.

대표청구항 ▼

A training device which interactively guides a tennis racquet by exerting a towing force on a card which is connected to the tennis racquet. The device includes a vertically adjustable support connected with a guide pole fixed to a wall. A swivel arm is movably supported on the support and has a dis

A training device which interactively guides a tennis racquet by exerting a towing force on a card which is connected to the tennis racquet. The device includes a vertically adjustable support connected with a guide pole fixed to a wall. A swivel arm is movably supported on the support and has a distal end which suspends a ball therefrom. The cord extends along the swivel arm and the support, and one end thereof is connected to the racquet through a stirrup. original is detected by said first detector before an image reading operation is started. 7. An original feeding apparatus according to claim 5, further comprising a discharge tray on which the original fed from said original tray and subjected to image reading is rested, and wherein, after said second detector is changed to the detection possible condition, said controller changes said second detector to the detection impossible condition in response to the fact that all originals rested on said original tray are discharged onto said discharge tray. 8. An original feeding apparatus according to claim 2, wherein said second detector includes a light emitting element and a light receiving element, and said controller stops light emitting of said light emitting element when it changes said second detector to the detection impossible condition. 9. An original feeding apparatus according to claim 2, wherein said second detector includes a light emitting element and a light receiving element, and said controller reduces a light emitting amount of said light emitting element when it changes said second detector to the detection impossible condition. 10. An original feeding apparatus according to claim 2, further comprising a third detector for detecting an opening/closing condition of said original feeding apparatus, and wherein said third detector always detects the opening/closing condition regardless of the detection of the original by means of said first detector and informs an image forming apparatus of a detected result. 11. An original feeding apparatus according to claim 2, wherein said first detector includes a light emitting element and a light receiving element. 12. An original feeding apparatus according to claim 11, wherein said light emitting element is an LED and said light receiving element is a phototransistor. 13. An original feeding apparatus according to claim 2, wherein said second detector includes a plurality of sensors.