Wire pistol
US5074469A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1990 |
| Grant date | Dec 24, 1991 |
| Priority date | — |
| Expiry date | Mar 16, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K9/1336
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a wire pistol comprising a wire feed mechanism including a wire feed pulley rotated by a DC motor and a counterpulley for biasing the wire into engagement with the feed pulley. It is an object of the invention to provide a wire pistol of this type in which, in contrast to prior-art wire pistols, no transmission shift operation or no transmission replacement is required over the entire adjustment range of wire feed rates. This object is attained according to the invention by the provision that the DC motor is adapted to have successive operating voltage pulses of variable pulse width and/or variable pulse frequency applied thereto for thus controlling the wire feed rate. This provision ensures that a sufficiently high torque for the wire feed operation is also available at very low wire feed rates, i.e. at low rotational speeds of the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.