its outer circumference 82 these teeth are used for electrical impulse timing purposes in order to time the operation of the entire printer based upon motor movement in effect the movement of the shuttle is timed with the respective firing of the hammers and the driver movement by the shuttle motor 80 the hammerbank assembly 72 is driven by the motor 80 by means of two reciprocating drive rods 88 and 90 on the back of the hammerbank assembly 72 is a circuit board 92 which is connected by cable connection 93 to a flexible cable 94 having a number of lines thereof which terminate at a terminator board 96 the terminator board 96 provides a number of pins 100 for power as well as pins 102 for providing logic to the circuit board 92 looking more particularly at fig3 and 5 it can be seen that the hammerbank is shown in cross section fig3 is sectioned along lines 3 3 of fig2 the sectional view in fig3 shows the hammerbank casting 108 formed from an upper portion 110 and a lower portion 112 the respective upper portions 110 and lower portions 112 have a number of through holes 114 passing therethrough the through holes 114 receive a pair of pole pieces formed as an upper pole piece 116 and a lower pole piece 118 the two pole pieces 116 and 118 terminate at ends 120 and 122 looking more particularly at fig4 it can be seen that the upper pole piece 116 and the lower pole piece 118 have their ends 120 and 122 in contacting relationship with a series of hammers 124 the hammers are fundamentally.