Sorting machine with shaking action for e.g. flower bulbs, has sorting bed holder moved up and down using driven rotary eccentric cam and cam follower

摘要

#CMT# #/CMT# The drive mechanism (11) for the sorting bed holder (3) comprises a driven rotary eccentric cam connected to the frame (2) for the holder and a cam follower connected to the cam. A means is provided for altering the rotary speed of the cam within one or more turns. #CMT# : #/CMT# A sorting machine (1) using shaking action comprises a sorting bed holder movably suspended from a frame and a drive mechanism for the holder comprising a driven rotary eccentric cam and a cam follower. The cam is connected to the frame and the follower is actively connected to the cam in order to move the holder up and down repeatedly with respect to the frame. The position of the holder relative to the frame depends on the rotation angle of the cam relative to the frame. A means is provided for altering the rotary speed of the cam within one or more turns, preferably within one turn. #CMT#USE : #/CMT# For sorting round objects such as flower bulbs, onions, Brussels sprouts or beet. #CMT#ADVANTAGE : #/CMT# The machine has a greater scope for making adjustments and such adjustments can be made more easily. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The figure shows a perspective view of the sorting machine. 1 : Sorting machine 2 : Frame 3 : Sorting bed holder 11 : Drive mechanism #CMT#MECHANICAL ENGINEERING : #/CMT# The follower is in contact with the cam. A detection system is used to determine at least one rotary position of the cam and comprises a first detection device on a cam which cooperates with a stationary second detection device. The first detection device comprises at least one protruding part preferably extending in the axial direction relative to the cam and arranged in a series preferably connected by a strip secured concentrically to the cam. The second detection device is a sensor. The drive system includes a control means comprising devices for measuring movement parameters and the rotation angle of the cam and a device for maintaining the rotation of the cam. These parameters provide a value for two cam revolutions and are inputted using at least one potmeter. The rotation angle measuring device comprises a first detection means connected to the cam and aligned with a stationary second detection device. Cam revolution speed can be altered during downward movement of the holder so that the downwards acceleration of the holder is 70-100% of the acceleration due to gravity. The cam has a peripheral surface with a concentric part extending around at least 50% of the cam periphery and an eccentric part comprising a concave region in between two convex regions. The concave region smoothly overlaps the convex regions. The first detection device extends parallel to the concentric part of the peripheral surface of the cam. An electric motor is used to drive the cam. The device for maintaining the rotation of the cam comprises a frequency regulator.