TECMES MB-BR base machine bench

is made from an electro welded frame, and many different models can be produced to satisfy customers specific requirements. The bench comes in the BN version for electrical switchboards to be fitted on the outside of the machine, or in the BT version with cabinets to hold electrical, electronic and pneumatic equipment. The cabinets are fitted with a removable panel to fasten the electrical equipment, holes for ISO 25 cable clamps for the connecting cables and seals for the covers.

The surface of the steel machine bench plate is treated with chemical nickel plating.

The two bench tops are ground to a flatness tolerance of 0.5mm/m2. On request, holes or machining for fixing purposes can be made in line with the customer's specifications.

The AUTOROTOR Series 5 rotary table provides the tooling plate rotation: this is a mechanically driven unit with square axis and barrel cam in oil bath. The number of stations can be: 8-10-12-15-16-18-20-24-28-30-32-36. The aluminium alloy tooling plate comes complete with holes to fix the piece holders according to the customer's specifications. The torque limiter mounted on the rotary table camshaft protects the transmission and the mechanical organs of the table in the event of collision while the tooling plate is turning. The limiter is fitted with a microswitch that gives the electrical release signal and a phase roller so that the rephasing takes place in just one position, thus respecting the perfect synchronism of the machine.

Table transmission is accomplished with a pre-stretched and pre-run chain, complete with a manually adjustable chain tensioner. The encoder transmitting impulses to the angular positioner replaces the previous mechanical cam programmer and generates a phase signal to control pneumatic devices such as grippers, pacers and external units.The oscillator designed to drive main shaft oscillations and subsequent radial sled movement is a mechanical AUTOROTOR Series 5 unit with square axes and barrel cam in oil bath.The control unit for the main shaft vertical stroke, which transmits vertical movement to the arm-holder turret, can have
either an eccentric cam or a parallel axes oscillator. In the eccentric cam version, speeds of up to 6000 cycles/hour can be achieved with a maximum vertical working stroke of 50mm.

In the oscillator version, the vertical stroke reaches 80mm although the speed is limited to 1000-3000 cycles/hour depending on the stroke.
Reduced backlash worm screw type reducers drive the machine transmission. The cylindrical screw is made of casehardened and tempered steel
with a ground and precision-finished involute profile, while the crown gear is made of phosphorous bronze with long-life lubrication. The synchronized
command of the reducers is achieved with a toothed belt complete with manually adjustable belt tensioner.

Thanks to the inverter (optional) built into the three phase brake motor, machine speed can be adjusted and the machine can be started and stopped with programmable acceleration and deceleration ramps. The machine central turret consists of a fixed part and a movable part guided on 4 bushings with high-speed type ball cages. The movable part has two circular slots to fix the radial arms, the probes and the units that require vertical movement. Another circular slot on the fixed part of the turret is for photocells supports or small pneumatic units. The oscillating disk to control the radial stroke of the sleds that slide on the arms is fitted with dovetail radial slots to fix the sled driving rods. By varying the working radius of the driving rods you can adjust the sled stroke. By adjusting the driving rod you can adjust the sled stroke control and the working position of the sleds.

The machine is fitted (on request) with a control unit to check that components have been loaded correctly. The control unit consists of a rod that slides inside an aluminium sensor-holder body to probe components. To move components, the machine is fitted with radial arms consisting of an aluminium casting on which a sled is guided by a sliding shoe. Rails 240 - 325 - 420mm long are fixed to the arms and one or two sleds can be mounted on them as shown in the examples in this catalogue. Two columns that can be adjusted vertically by means of dead stop collars enable the grippers to be fixed to the sleds.These columns are fitted with springs for the vertical elastic compensation of the gripper, preventing the grippers themselves, or other machine organs, from breaking if defective components should be assembled (burrs, deformed pieces, incorrect tolerances, etc.).
 

Base Linear Machine

When technical assembly solutions require assembly processes that do not lend themselves well to a rotating table machine concept, the choice of a linear system is
the best alternative to achieve high flexibility and accuracy at the same time.

Thanks to the know-how gained with the mechanical and pick and place synchronism of rotating machines, TECMES has engineered a high performance and reliable linear machine with a mechanical concept based on a pallet conveyor belt. The machine structure can be fitted with a wide range of arms based on mechanical
or pneumatic motion.

In the mechanical linear machine the conveyor belt “TPM” and the central transmission-shaft, as well the connection with the arms movements, are all driven by a single electric motor in mechanical synchronism. This provides reliability, accuracy and easy accessibility, which is typical of mechanical machine designs.

As for all TECMES machines, the linear arms are placed in the middle of conveyor and they work from the inside to outside in order to get comfortable and wide accessibility. The conveyor is based on two base modules: the driving head and the free head. This system provides a solid body structure which grants stiffness and great ruggedness. The system is available in many different lengths to meet the demanding needs of multiple component assembly requirements.

An intermittent drive unit could be provided with a torque limiter mounted on the inlet camshaft or on the indexed exit shaft. Each unit has micro-switch control and a phase roller device to restore the home position and the complete machine synchronism. The structural stiffness as well the Autorotor unit precision which all of
our linear machines are outfitted with, gives the benefit of a highly reliable conveyor belt with the accuracy of millimetres. The linear arms are driven by a single cam with specific strokes and cycles, which takes advantage of kinematic acceleration and deceleration laws based on mechanical motion. The use of this technique means higher overall, reliability, accuracy and machine performance.

As an alternative, all linear arms of a machine could be driven by multiple shafts actuated by the Autorotor oscillating unit. Vertical and horizontal strokes are adjustable (± 2,5 mm) by simple and robust adjusting levers. Thanks to the modular construction, it is extremely easy to replace or to add any arms in the field, should the final assembly process require such an addition.