Fides Bonnell Transfer Machine



Description of operation

The FT-81 transfer system is a fully automatic, compact unit with a straightforward design that manu-factures high-quality, completely finished Bonnell innerspring units.

In four processing steps, the wire, which is fed from the swift, is processed to a spring. After the coiling process, the springs are placed into a starshaped, 6-arm transport wheel and are gradually advanced to the next step. On the front side, the spring ends are knotted into end rings and then heat-treated between two electrodes. This heating relieves the wire from the stress of the coiling process and therefore reduces the setting loss.

The finished springs are picked up by a turning arm and the knots turn to the correct position. The springs are finally moved vertically into the conveyor channel and are gradually advanced. The feed rate corresponds to the spring spacing within the spring unit. During transport, the springs are turned from the horizontal to the vertical position.

After the programmed unit width has been reached, i.e., the required number of springs has been loaded, the row will be pushed by a loading slider into the jaws of the assembly machine. Using a helical feeder on the left side, one row after the other is tied into an innerspring unit. The innerspring unit ejection on the operator side allows for optimal handling by the operator.

Type of springs Bonnell
Spring dimensions Spring end ring Ø (Dfi) 69 – 88 mm
Number of jaws: 18 standard
Jaw type 88 (Dfi 75 – 88 mm): max. 20 jaws
Jaw type 74 (Dfi 69 – 76 mm): max. 24 jaws
Jaw type 68 (Dfi 65 – 70mm): max. 25 jaws (on request)
Spring height 4 turns Low height 55 – 75 mm
4 turns 75 – 120 mm
5 turns 120 – 150 m
6 turns 140 – 160 mm
7 turns 160 – 190 mm
Spring wire gauge Jaw type 88: 1.9 – 2.4 mm
Jaw type 74: 2.0 – 2.3 mm
Helical wire diameter 1.3 – 1.4 mm
Working width 2‘000 mm
Performance up to 81 springs / minute
(depending on spring dimensions)
Air consumption approx. 0.45 m3 / hour
Power consumption total approx. 20 kVA
Power requirements Voltage: 3 x 400 V, input fuse: 63 A or
Voltage: 3 x 220 V, input fuse: 100 A
(other Voltages on request)
Frequency: 50/60 Hz
Working temperature +10° C to +40° C
Weight net approx. 3‘500 kg
(swift with safety mesh guard net approx. 680 kg)
  • Easy adjustment of end ring diameters in the knotting units.
  • The stacking device is equipped with the unique spring turning station.
  • 18 jaws included in the standard equipment. Each jaw can be used as a knuckling device.
  • Very fast and flexible setting of the unit width
  • Very compact and minimum space requirements


FT-81 – Movie