THEORY OF OPERATION Chapter 2
2 - 1
2.1 MECHANICAL
2.1.1 Mechanical Drive Assembly
2.1.1.1 Overview
The Mechanical Drive Assembly provides several operational functions for the pump. In
operation, this assembly:
1. Secures the syringe plunger and linearly pushes the plunger into the syringe barrel;
2. Senses whether the syringe plunger is captured properly;
3. Senses the linear position of the syringe plunger;
4. Is designed to function with 1 mL to 60 mL syringes from three different manufacturers.
Three screws attach the Mechanical Drive Assembly to the case. Two connectors (Drive
Pot./Membrane Switch Berg connector and the Strain Gage connector) provide electrical
paths to corresponding connectors on the analog printed circuit board located on the
Cover. The other side of the Mechanical Drive Assembly has a flange that fits into a
groove in the Cover.
2.1.1.2 Syringe Installation
The Mechanical Drive Assembly and the Barrel Clamp Assembly both serve to secure a
syringe to the pump. Pulling the Slide out from the Mechanical Drive Assembly as far as it
will go allows the plunger driver to be moved in either direction. With the barrel clamp
open, the syringe flange is then inserted into the flange slot of the Barrel Clamp and the
syringe plunger is inserted between the Face and Slide of the plunger driver.
2.1.1.3 Drivetrain
The Drivetrain consists of the Motor/Gearhead/Encoder Assembly (assembly includes a
Micro-Mo DC Motor, a 485:1 Gearbox, and a 16 pulse per revolution encoder), and several
other Drivetrain parts cited below.
At the motor end of the Drivetrain, two screws are used to attach the
Motor/Gearhead/Encoder Assembly to the Motor Plate Assembly. The Motor Plate
Assembly includes the Motor Plate, the Drive Seal, and an Oilelite Bearing. Using an
adhesive, the Drive Seal is bonded to the Motor Plate and the Oilelite Bearing is slip fitted
into the Motor Plate to accommodate one end of the Leadscrew.
The Load Plate Assembly, positioned at the other end of the Drivetrain, includes the Force
Plate/Insert Assembly, the Force Plate Seal, and a Spherical Bearing. Using an adhesive,
the Force Plate Seal is bonded to the Force Plate/Insert Assembly and the Spherical
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