﻿ Step 6B.5: Label from P&P Tool to Transfer Tool

# Step 6B.5: Label from P&P Tool to Transfer Tool

This Step reviews the design that is necessary to transfer the label from the P&P Tool to the Transfer Tool.

#### Requirements Specification

To transfer the label from the P&P Tool to the Transfer Tool:

 • Make the position and velocity vector of the P&P Tool be identical to that of the Transfer Tool at each contact-point as they roll over each other.

We can satisfy the motion condition if we roll, without slipping, the P&P Toll along the Transfer Tool.

Available Design Variables:

 • Shape of the P&P Tool NO: The shape of the P&P Tool was set in Step 6B.4.
 • Motion of the P&P Tool
 • Shape of the Transfer Tool
 • Motion of the Transfer Tool

Note that the Transfer Turret rotates in the same direction to the P&P Turret. This means that the tools move in opposite directions as they pass each other.  This is a very onerous design problem.

#### 'Solution'

Summary of the Transfer of the Label from the P&P Tool to the Transfer Tool

This video shows the motion and shape of the Transfer Tool at the end of this Step.

 • The shape of the Transfer Tool 'reaches' the P&P Tool.
 • The motion of the Transfer Tool relative to the P&P Tool allows the shapes to roll along each other.

#### Transfer the Label from the P&P Tool to the Transfer Tool

Here, we design the shape and motion of the Transfer Tool and the motion of the P&P Tool.

Q: What is a basic shape and shape for the Transfer Tool?

A: An initial guess for the shape of the Transfer Tool might be an Arc with a centre-Point at the centre of the Transfer Tool.

In this condition, the Tools will touch as they pass each other.

See image to the left...

Q: What rotation motion of the P&P and the Transfer Tools will roll them against each other?

First Try 1: Rotate the:

 • P&P Tool 'backwards', relative to the P&P Turret, so it is stationary relative to the Mechanism-Plane
 • Transfer Tool 'backwards', relative to the Transfer Turret, so it is stationary relative to the Mechanism-Plane.

The image, above, shows the velocity vectors shortly before they contact at the 'in-line' position. See Point Vectors and Position dialog-box.

Question: Is that it?

Even though it is possible to change the motion of the P&P Tool and the Transfer Tool, it is not easy (impossible?) to find suitable motions to roll the tools along each other. Therefore, it is better to change the motion of one or the other, but not the two.

I have elected to:

 • Keep the P&P Tool fixed relative to the P&P Turret.
 • Edit the motion of the Transfer Tool.
 • Edit the shape of the Transfer Tool.

To edit the Shape of the Transfer tool, I set up a Design-Set,

The sketch to the left shows the dimensions I used in the Design-Set to edit the Shape of the Transfer Tool.

We colour dimensions in the Design-Set as Magenta [R10, in R11+ dimensions in the Design-Set or Grey]

This image shows the Velocity Vectors at the instant the two tools (shapes) come into contact.

The velocity vectors are superimposed. This shows that the velocities are identical: direction and magnitude.

You can add many points to the edge of the each tool to show the relative velocities.

When the velocities are identical for each point, the tools roll along each other. This is perfect motion to transfer a label.

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