Electronic instrument for determining and totalizing the repetitive operation of a material fabricating machine

Claim 1

An analyzer unit for use with a work performing tool which has a member that is repetitively operable to fabricate a workpiece on each repetition comprising switch means actuatable from a first position to a second position by the repetitively operable member of the work performing tool and to provide a signal representing each repetition thereof, a pair of relays, circuit means connecting said switch means to one of said relays, said switch means being actuatable by said operable member of said work performing tool to said second position effective to produce said signal to operate said one relay to a first condition, counter means, contact means for said one relay in circuit with said counter means and actuatable in response to said one relay being actuated to said first condition effective to cause said counter means to receive and accumulate said signals to totalize the number of repetitions of said tool member, the second relay of said relay pair being normally in a first condition and including contact means connected into said circuit means in series circuit control relation between said switch means and said one relay, said counter means having contact means connected in series circuit controlling relation with said second relay, said second relay being normally actuatable to a second condition in response to each operation of said counter means effective to cause the operation of its contact means and cause the first relay to be actuated to a second condition effective to prevent a subsequent actuation of said one relay to its first condition until the second relay is returned to its first condition, said second relay being returned to said first condition in response to and subsequent to said switch means returning to its first position.