| 摘要 |
This device is used to train beginner and advanced players. It enables an automatic modification of the spin and speed of the thrown balls. It comprises a hopper (1), attached statically above the mechanism for regulating the throwing frequency (3), which is fitted to the top part of a bearing construction (17). Inside this construction is located an operating mechanism, consisting of two power engines (31, 32), to whose axes are fastened two foam cylinders (13, 14), two balls pressing furrows (15, 16) and two flexible channels (8, 10), fastened to two vertically located plates (9, 11), hinged onto an axis (12). To the bottom part of the bearing construction is fitted a horizontal rotation mechanism. To the bottom part of the frequency-regulation mechanism is fitted a mechanism for directing the balls, consisting of a tube (4), connected jointly by brackets (5) to the frequency-regulation device, and by an arm (6) to an electric magnet (7) for directing the balls to the flexible channel (8), fastened to the left vertical plate (9), or for directing the balls to another flexible channel (10), fastened to a right vertical plate (11). The left and the right vertical plates, are fitted with an option for displacement at a specified angle around the hinging axis (12).
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