Browse Prior Art Database

Head Suspension Assembly Merge Pin Oscillator

IP.com Disclosure Number: IPCOM000108077D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 4 page(s) / 160K

Publishing Venue

IBM

Related People

Barenboim, M: AUTHOR [+4]

Abstract

Described is a head suspension assembly (HSA) merge pin oscillator mechanism and circuitry for use in the insertion of a merge pin in a group of recording head mounting blocks.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Head Suspension Assembly Merge Pin Oscillator

       Described is a head suspension assembly (HSA) merge pin
oscillator mechanism and circuitry for use in the insertion of a
merge pin in a group of recording head mounting blocks.

      The concept is based on an electronic oscillating feedback that
is proportional to the frictional load of the pin which, in turn,
enables the merge pin to be easily inserted in recording head
mounting blocks.

      Fig. 1 is a perspective view showing the actuator assembly
consisting of comb 1 with nine arms 2, swage holes 3, sixteen HSAs 4
and cable 5.  During merge and swage operations, a pin (not shown) is
threaded through eight HSAs 4 and eight corresponding comb swage
holes 3.  The HSA merge pin oscillator is used for two major
purposes:  First, it aids in merging the HSAs with the comb's swage
holes 3 by oscillating during the merge process.  In prior art,
operators would thread a pin with their fingers while merging the
HSAs toward comb 1.  From experience, the operator would know the
degree of force necessary to apply to the merge pin.  The operators
would adjust their hand motion while the pin is being inserted.  With
the merge pin oscillator mechanism, the second purpose is attained in
that the oscillator provides a means for the pin to receive an
automatic force adjustment during the automated HSAs merge process.

      Fig. 2 shows the relationship of the actuator assembly, circuit
card and motor.  Base frequency generator 6 is used to generate the
basic frequency while frequency divider 7 provides several frequency
choices. Frequency selector 8 selects a particular frequency based on
the frictional load on merge pin 9.  The selection criterion is to
select a slow frequency for a higher load and a fast frequency for a
smaller load.  Frictional load is measured by load cell 10. The
analog output signal of load cell 10 is compared with predetermined
values for the frequency selection criteria. The selected frequency
is dependent on the load and is applied to motor driver 11.  Motor
driver 11 oscillates merge pin 9 by way of motor 12.

      Fig. 3 shows the details of the electronic circuitry, as shown
in the dotted portion of Fig. 2, and consists of the following:
       . Base frequency generator 6 - Consists of electronic
oscillator 13 and a resistor/potentiometer/capacitor network 14, 15,
16 and 17 which are used to generate and adjust the basic frequency.
The basic frequency is adjusted with potentiometer 15.
       . Frequency divider 7 - Consists of binary frequency counters
18 a...