Table Drive Mechanism in Planer M/C

 Table Drive Mechanism in Planer M/C

When the drive mechanism is made up entirely of gears, a large gear known as a bull gear is connected to a rack on the bottom side of the table and to an electric motor by a series of gears. The quick return of the planer table is accomplished by adjustable stops on the side of the table, which, at the end of each cutting stroke, come in contact with a lever that engages a high-speed gear in the driving train of gears.

In the belt-driven type of planer, two belts, one open and one crossed, operate on loose and fixed pulleys. The table travel stops come in contact with a shifter lever at the end of each stroke. As it makes contact at the end of the cutting stroke, the lever throws the belt off the fixed pulley onto the loose pulley. At the same time, it throws the crossed belt from a loose pulley to a fixed pulley.

OPEN BELT

Figure 16-4 shows a basic diagram illustrating the rack-and-spur-gear method with belt-pulley drive.

OPEN BELT

BULL GEAR

1ST INTERMEDIATE

2ND INTERMEDIATE

BULL GEAR

1ST INTERMEDIATE

2ND INTERMEDIATE

Because the crossed belt is running faster than the open belt, the table moves faster on the return stroke. The operator can shift the lever by hand to run the belts on loose pulleys, thus stopping the movement of the table without stopping the whole machine. The lever can be locked in neutral position to prevent accidental starting of the machine.

The open- and crossed-belt drive mechanism permits operation of the gear train in such a manner that the table will travel slowly on the cutting stroke, reverse, and travel faster on the return stroke. Four pulleys (two larger pulleys and two smaller pulleys) are required (Figure 16-5). One of the larger pulleys and one of the smaller pulleys are keyed to the drive pinion shaft and are called tight pulleys to distinguish them from the other two pulleys, which turn freely on the shaft and are called loose pulleys.

Open And Cross Belt Drive Mechanism
Figure 16-5 Basic diagram of open- and crossed-belt drive of a planer table drive mechanism.

The larger tight pulley is used for the slower forward speed (or cutting-stroke drive), and the smaller tight pulley is used for the quicker return stroke. Both belts are driven by wide-faced pulleys of the same diameter placed on the countershaft. The open belt on the larger tight pulley drives the machine at a slower speed than the crossed belt on the smaller tight pulley. In actual operation, both belts run continually and can be shifted back and forth by the belt shifter, which is linked to the reverse lever.

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