Work Transfer Mechanism of Transfer Machines

Work Transfer Mechanism of Transfer Machines

Work Transfer Mechanism of Transfer Machines - The transferring of components from station to station can again be done in many different ways. In the case of rotary and drum transfer machines, it its function of the indexing mechanism.

On in line machines various mechanical device have been used, such as endless chain conveyors fitted with spring loaded pawls on the top. Hydraulically operated transfer bar may also be employed for an in line transfer machine.

Various conveyors used to transfer the parts being machined from one station to the next machining station in transfer lines. Intermittent conveyors are used to transfer both housing type parts and parts clamped in pallets.

Intermittent Conveyor	Transfer Bar Rotating Finger Type Conveyor
Transfer Bar of the Walking Beam Type Conveyor	Overhead Transfer Bar with Grips Conveyor
Pushing Type Intermittent Conveyor	Chain Conveyors

To move workpieces 2 along the line, this transfer bar is imparted periodic reciprocating motion.

A transfer bar of rotating finger type provides higher accuracy of workpiece movement and positioning on machining stations. Transfer bar 3 with fingers I is imparted a periodic reciprocating motion and a rotating motion about the bar axis. The workpiece being machined are moved only during the forward stroke of the bar.

A transfer bar of the walking beam type is shown schematically. To convey the workpieces, bar 3 are imparted two consecutive reciprocating motions in the horizontal and vertical planes. Workpieces 2 are driven by fingers 1.

An overhead transfer bar with grips is a complicated version of the walking beam type, in which workpieces 2 are transferred by means of grips 1. The grips are carried by bar 3, which move above the workpieces.

An intermittent conveyor of pushing type transfers workpieces 2 by means of piston rod 3 of a hydraulic or pneumatic cylinder. During the forward stroke, the piston rod pushes simultaneously all the workpieces or pallets (i.e. holding fixtures) located on the conveyor.

Chain conveyors are used in many transfer lines where continuous motion of the workpieces being machined is required. This type of conveyor is hardly ever used for intermittent motion, because it cannot provide accurate work transference for location and clamping at the machining stations.