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IDEA NOTE Reversing at the desired angle on 2 axis simultaneously using a rack & pinion mechanism.
The unit is linearly driven with 2 racks fixed in parallel and can be reversed on the 2 axis simultaneously for any desired angle of the pinion gear.
IDEA NOTE Radial + thrust
Workpiece positioning and rotation are supported by a mechanism combining a radial bearing and a thrust bearing.
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* Unit assembly Data consists of some sub-assemblies.
It is configured so that each sub-assembly unit can be used as it is or edited.
Application Overview
Purpose
One axis of the linear rack section is driven by a cylinder, the pinions on the other axis are then rotated simultaneously to reverse them to any desired angle. (90° in the example).
Points for use
The work piece is transferred in and out by the up and down motion of the chucking mechanism on the external unit.
The stroke is controlled by both the sensor of the cylinder, and a mechanical stopper to ensure the precise workpiece angle.
Target workpiece
Material: Resin
External Shape:φ9 x W41mm
Mass: 3g
Features
Operating specifications · Dimensions
Workpiece rotation angle: 90°
Pinion Gear: m1.5, z32, P.C.D. 48mm
Required Cylinder Stroke: 37.7mm
System External Shape: W 390 x D 300 x H 106mm
Required accuracy・Load
Cylinder Thrust: 6.83N or more
Selection criteria of main components
Cylinder
Adopted thin type cylinder for space saving.
Pinion Gear
A pinion gear with a tap hole is used affixed to workpiece jig, so the jig can be rotated.
Design point
Calculation processes for the main components
Whether the cylinder thrust force can handle the slide-way load and rotation section load is verified below.
Thrust of cylinder (φ20mm, ST 50mm)
Condition value: Slide way total weight m1 = 1.714kg, linear guide friction coefficient μ1 = 0.005 (from catalog), rotating section total weight m2 = 0.688kg, conversion factor to slide motion of rotating section μ2 = 1 (assumed as a slide with a friction coefficient of 1 for safe side), operating pressure of cylinder: 0.2MPa
Slide way load: F1 = m1 x g x μ1, thus, F1 = 1.714 x 9.8 x 0.005 = 0.084N
Rotating section load: F2 = m2 x g x μ2, thus, F2 = 0.688 x 9.8 x 1 = 6.742N
Total load: F = F1 + F2 = 0.084 + 6.742 = 6.83N
Pull side thrust of cylinder: F0 = 47N(from catalog)
Safety factor: F0/F = 47/6.83 ≒ 6.88
Structure elaboration and design key points.
This system is effective for a corner section, that requires the reversing of multiple parts on an automated line in single file.
The workpiece table has a slotted hole in the rotated direction in order to enable the adjustment of the work piece position during rotation.
Installing a sensor and mechanical stopper in parallel enables precise positioning and angle adjustment of the workpiece. It also reduces the generation of moments by stopping the transmission of cylinder thrust prior to hitting the mechanical stopper.
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