7-6 CHAPTER 7: GENERAL DESCRIPTION
ALPHA ST320 S2
3. CHANNEL SET PART II: FEEDING SYSTEM
The feeding system consists of the pusher assembly and chain transmission device. With this system,
the motor drives the pusher forward and backward hence achieve following functions:
1) Bar insertion
2) Bar feeding and moving
3) Remnant retraction
During automatic mode, there are 2 motion modes for the feeding system:
1) Without synchronization device:
The feeding system pushes forward all the time either the lathe chuck is open or closed. Applied for
both fixed and Swiss type lathe.
2) With synchronization device (optional):
When chuck is closed, the feeding system movement is synchronized with the spindle. When the
chuck is open, the feeding system feeds forward all the time. This mode applied for Swiss type lathe
only. For safety reason, a torque stop interface signal is available for stopping the pusher when
chuck is open.
3.1. Chain transmission mechanism
T
he chain transmission mechanism is composed of servo motor, chain wheels and chain. The chain
transmits force between the servo motor and pusher assembly hence drives the pusher assembly and
bar stock.
3.2. Pusher assembly
The pusher assembly is composed of an introducer and a pusher. They are carried by the chain. The
connection between the pusher and the chain is decided by the position of the channel cover.
The short pusher is a short solid cylinder which also called flag. It is always connected with the chain
either the channel is open or closed. When the channel is closed, it simply follows the movement of the
long pusher. When the channel is open, its movement mainly serves to position a bar stock to the
insertion position.
The long pusher is a long rod which serves to control the bar stock movement either in the bar feeder or
lathe spindle. When the channel is open, the long pusher is disengaged from the chain and lifted by the
pusher carrier. When the channel is closed, the long pusher engaged with the chain.
Part of the long pusher is able to extend out side the bar feed system. In the other hand, the pusher must
enter the spindle to get a shortest remnant. During installation, it must be confirmed that the tip of long
pusher is able to contact the rear end of lathe chuck.
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