ITC TA VSS EN
ITC TA series indexers are parallel-axis mechanisms that transmit intermittent or oscillating rotary motion from a system of three shafts – one central input shaft (0) and two output shafts (1 and 2) – that move synchronously with each other.
Motion is transmitted by two groups of cams with conjugate profiles keyed to the input shaft and roller sensors located on the two output shafts. The profiles are manufactured in such a way as to ensure, at all times, that both cams are in contact with a roller, thus guaranteeing the absence of backlash in the transmission, with improved precision and repeatability of positioning and a reduction in noise and vibrations, with a consequent reduction in wear.
This mechanical unit can drive the output shafts in the following manners: -INTERMITTENT AND OSCILLATING -INTERMITTENT AND INTERMITTENT -OSCILLATING AND OSCILLATING
The ITC TA indexer is enclosed in a watertight cast iron housing. All surfaces are machined and give the possibility of mounting the mechanism in any position, also allowing the direct mounting of gearboxes and gearmotors. The auxiliary mounting holes can be drilled in the surfaces containing the input and output shafts, avoiding the need for tie rods.
The unit does not require maintenance as it is lubricated with permanent grease.
Standard laws of motion
Long term experience in the field of cams has led ITALCAMME to the development of LAWS OF MOTION for the produced mechanisms, which represent the best kinematic and dynamic properties. The standardized LAWS OF MOTION are characterized by continuous acceleration curves, without sharp variations at any point during the movement, those are symmetrical, with the axis of symmetry coinciding with the mid-point of the movement; initial and final speed and acceleration values are zero. Each law is distinguished by its own speed (Cv) and acceleration (Ca) coefficients, which respectively represent the maximum speed and acceleration for a unit displacement implemented in the unit of time. The laws of motion normally used are the following:
Cycloidal (Cv=2, Ca=6.28)
This curve is also known as a sinusoidal curve. Among the standardized curves, this one has the highest maximum acceleration value, but it also has the smoothest passage from zero acceleration to full acceleration.
Modified cycloidal (Cv=1.76, Ca=5.53)
This curve is obtained by the combination of the sinusoidal acceleration curve and cosinusoidal acceleration curve. Its main characteristic is that it features, among the standardized curves, the smoothest passage between maximum acceleration and maximum deceleration values. It’s also known as Modified Sinusoidal.
Modified trapezoidal (Cv=2, Ca=4.89)
This curve is obtained from the combination of the sinusoidal acceleration curve and constant acceleration curve. Its main characteristic is that, among the standardized curves, it has the lowest maximum acceleration.
Modified sinusoidal with section at constant speed (Cv=1.4, Ca=6.62)
This curve is obtained from the modified cycloidal curve. The introduction of a section with constant speed and zero acceleration at the middle point of the acceleration curve reduces maximum speed and makes this curve especially suitable for applications with long strokes. This curve is the prototype of a family of derived curves, differentiated by their slightly different acceleration and speed coefficient values, which are applied in specific cases, where they are more advantageous than standard normalized curves.
Contacting the technical department ITALCAMME, you can design angles and special laws of motion according to the specific application needs.