DRIVES AND CONTROLS 



249 



Bobbin 



lis shuHle 

 oscilbfes wM , 

 the/ay s^:^. 



P/vofed, 



>7r- 



^-F/xed 



Fig. 528. — Schematic diagram of mechanism to 

 cause bobbin changer to operate. If the contact arm 

 does not sHp on the bobbin, the lever A will rotate 

 to the position shown. But if contact with the 

 bobbin center slips, as it will do if the bobbin is emptj', 

 lever A will not rotate to the position indicated by 

 the dashed line, thereby causing the bobbin changer 

 to come into action. 



Mach/ne iob/e^ Adjusiable dog 



_I_ 



'X-slo-l-i 



Clutch and brake 

 operating sfjafi 



Fig. 529. — Simple type of stop mechanism for hmit- 

 ing the stroke of a reciprocating machine member. 

 Arrows indicate the direction of movement. 



Reciprocating 

 shaft, 



Catch 

 lever 



-tiarc/ened 

 steel stops 



control 

 shaft 



Fig. 530. — In this textile machine, any movement 

 that will rotate the stop lever counterclockwise will 

 bring it in the path of the continuously reciprocating 

 shaft. This will cause the catch lever to be pushed 

 counterclockwise and the hardened steel stop on the 

 clutch control shaft will be freed. A spiral spring 

 then impels the clutch-control shaft to rotate clock- 

 wise, which movement throws out the clutch and 

 applies the brake. Initial movement of the stop 

 lever may be caused by the breaking of a thread, a 

 moving dog, or any other means. 



\\%f'Pour/ng spout 

 , Latch 



Fastened 

 to frame 



Fig. 531. — When the predetermined weight of 

 material has been poured on the pan, the movement 

 of the scale beam pushes the latch out of engagement, 

 allowing the paddle wheel to rotate and thus dump 

 the load. The scale beam drops, thereby returning 

 the latch to the holding position and stopping the 

 wheel when the next vane hits the latch. 



