OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 6 No. 1 2024 Fig. 2. Kinematic scheme of the heddle drive mechanism The angle value is μ 1 = 15.15°. Further synthesis of the lever mechanism is carried out on the assumption that the angle of the lever rotation O3DD′ is equal to the angle O4EE′, while the hard angle for the lever CO3D is assumed to be 155°. In this case (see Fig. 2), the angle ξ is determined by: 1 180 ( ( 90 )), ξ μ μ = - - + (2) Here, the angle ξ = 130.15°. To determine the angle ξ 1, it is necessary to consider the triangle O2CO3. First of all, from an oblique triangle, we defi ne the side O21: 2 2 2 1 2 3 3 2 3 3 2 cos , O C O O O C O O O C ξ ¢ ¢ = + - ⋅ ⋅ (3) We received O2C1 = 270.849 mm. Then the angle ξ1 is determined from the expression: 1 1 180 ( (90 )), ξ μ μ = - - - (4) Its values were ξ1 = 99.85°. From the oblique triangle 2 3 O CO¢ , we defi ne the side O 2C′ 2 2 2 2 3 3 2 3 3 1 2 cos , O C O C O C O O O C ξ ¢ ¢ ¢ = + - ⋅ ⋅ ⋅ (5) The side size is O2C′ = 228.832 mm. Similarly, the rod length VS = 225 mm is found from the oblique triangles O2C0O3 and O2B0C0. To determine the angles v1 and v2, consider the expression 3 2 2 arcsin sin O C O C ν ξ æ ¢ ö÷ ç ÷ = ⋅ ç ÷ ç ÷ ç ¢ è ø , (6) The value of this angle is v2 = 23.008°.
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