tailieunhanh - Five Hundred and Seven Mechanical Movements - North, Dug_3

Tham khảo tài liệu 'five hundred and seven mechanical movements - north, dug_3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http Mechanical Movements. 23 69. B a small wheel with one tooth is the driver and the circumference entering between the teeth of the wheel A serves as a lock or stop while the tooth of the small wheel is out of operation. 70. The driving-wheel c has a rim shown in dotted outline the exterior of which serves as a bearing and stop for the studs on the other wheel A when the tappet B is out of contact with the studs. An opening in this rim serves to allow one stud to pass in and another to pass out. The tappet is opposite the middle of this opening. 71. The inner circumference shown by dotted lines of the rim of the driving-wheel B serves as a lock against which two of the studs in the wheel c rest until the tappet A striking one of the studs the next one below passes out from the guard-rim through the lower notch and another stud enters the rim through the upper notch. 72. Is a tilt-hammer motion the revolution of the cam or wiper-wheel B lifting the hammer A four times in each revolution. 73. To the driving-wheel D is secured a bent spring B another spring c is at- tached to a fixed support. As the wheel D revolves the spring B passes under the strong spring c which presses it into a tooth of the ratchet-wheel A which is thus made to rotate. The catch-spring B being released on its escape from the strong ị spring c allows the wheel A to remain Ị at rest till D has made another revolution j The spring c serves as a stop. 74. A uniform intermittent rotary motion in opposite directions is given to the bevel-gears A and B by means of the mutilated bevel-gear c. 75. Reciprocating rectilinear motion of the rod c transmits an intermittent circu lar motion to the wheel A by means of the pawl B at the end of the vibrating-bar D. 76. Is another contrivance for registering or counting revolutions. A tappet B supported on the fixed pivot c is struck at every revolution of the large wheel partly represented by a