Spot welding machine
US5412172A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1993 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Feb 2, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B15/2861
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A spot welding machine includes tip electrodes mounted on the tips of the first and second arms, respectively, a pressing actuator for moving at least one of the first and second arms to apply a pressing force to the tip electrodes, an interelectrode distance detector for detecting a distance between the tip electrodes, and a brake for braking the actuator. The distance between the tip electrodes, i.e., interelectrode distance can be set at any desired intermediate distance between the maximum and minimum distances, by braking the actuator when the arms are opened to a desired degree. In this manner, it is made possible to effectively reduce the required operation time, and by suitably performing such a brake control, it is also made possible to effectively lessen an impact caused when the tip electrodes come into contact with plates to be welded. A speed control device may be provided which variably controls the moving speed of the actuator in accordance with the interelectrode distance. In such a case, it is permitted to properly control the moving speed of the arms and hence of the tip electrodes in response to the current position of the arms, and therefore the contact impact c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.