ENGINEERING SERVICES AND CONSULTING Srl
Special automatic machines: dot matrix
impact printheads manufacturing.
Once the printhead was designed,
we were involved in the design and construction of the special
machines needed for mass production.
Automatic selection machine.
Among the components that
are part of the printhead (about 35 different codes) the one with
the highest technology is the armature (in our case 24 per head):
it is made of cobalt steel and after being punched and coined
(with a die made by our partner) it must be 100% tested. In order
to do this, we have developed a special automatic machine that
verifies different parameters (thickness, flatness,...) and
selects the good armatures from the waste ones.
Laser brazing machine.
The armatures must then be
joined to the needles (diameter 0.2-0.25 mm) by brazing. This
operation is carried out by a special automatic machine: a laser
brazing machine which, after having positioned the needle
and armature in a precise position, deposits the brazing paste
which is then melted using a laser beam.
This is a critical operation that is constantly monitored by means
of two cameras.
Once this group has been completed, the
entire printhead is assembled using a series of standard
machines (tangential grinding, washing machines, ovens, etc.)
until the complete head is obtained.
Special grinding machine.
Once the assembly has been
completed, the needles protruding from the printhead guide should
be ground to ensure their flatness and height of protrusion.
For this operation, a special grinding machine is used that
flattens the needles at a predefined height and carries out a
brushing operation to eliminate dust and grinding waste from the
end of the needles.
Parametric test equipment.
After the needle grinding
operation the printhead can be considered as finished, it is now
necessary to measure the key parameters (needle stroke, impact
force, coil resistance, etc.) to check that they correspond to the
For this operation we have designed and built a parametric
test equipment that measures, collects and stores the values
of these key parameters in a database.
Only after the printhead has passed this test can it start the
preliminary running-in step and then be installed on the printer.
The machines described
above (some in 2 units) were shipped to China where they were
installed in a specific workshop for the production of
the heads we designed.
Interested at our design activities?
Interested at our special automatic machines? Contact us
we will be glad to provide you with all the information you need.
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Consulting Srl - P. IVA 09705560010