GB784328A - Improvements in or relating to photo-electric machine guards - Google Patents
Improvements in or relating to photo-electric machine guardsInfo
- Publication number
- GB784328A GB784328A GB35835/54A GB3583554A GB784328A GB 784328 A GB784328 A GB 784328A GB 35835/54 A GB35835/54 A GB 35835/54A GB 3583554 A GB3583554 A GB 3583554A GB 784328 A GB784328 A GB 784328A
- Authority
- GB
- United Kingdom
- Prior art keywords
- machine
- curtains
- photo
- operator
- guard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
- F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
- F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
- F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
- F16P3/144—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using light grids
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
Abstract
784,328. Photo-electric protective devices. GENERAL ELECTRIC CO., Ltd. Dec. 9, 1955 [Dec. 10, 1954], No. 35835/54. Class 40 (3). A photo-electric machine guard arranged to prevent the machine being operated when any part of the operator's person is in danger comprises light curtains arranged to extend outwardly in front of the machine both above and below the danger zone, the machine being rendered inoperative only if both light curtains are interrupted. As described each curtain 2 comprises a plurality of beams of light arranged in a substantially flat horizontal plane extending outwardly from a point just in front of the machine. Each of the beams originates at a light source in support-member 4 on one side of the forward extension of the danger zone and is directed on to a photo-sensitive device in support-member 5 on the other side. The curtains are not necessarily parallel but may be flat or curved planes approaching each other in the direction away from the machine. The guard of the present invention is preferable to the provision of a vertical guard curtain immediately in front of the machine as described in Specification 717,399, where the work projects from the front of the machine. In the case of a machine operating on a projecting sheet of material movement of the sheet to interrupt either the upper or lower curtain of the guard according to the present invention does not stop the machine but interruption of both curtains by the operator's body does so. It may be arranged that the outermost light beam of one of the curtains acts as a master and that interruption of this beam alone renders the machine inoperative. In order that the operator may be reasonably near the machine when it has completed an operation the movement of the machine may progressively switch out of circuit the photo-cells associated with the parts of the curtains furthest from the machine. Guards according to the present invention and also as described in Specification 717,399 may be provided on the same machine and a changeover switch provided so that the operator may choose which is in use. Means as described in Specification 664,797 and 717,399 may be provided for checking the operation of the safety arrangements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB35835/54A GB784328A (en) | 1954-12-10 | 1954-12-10 | Improvements in or relating to photo-electric machine guards |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB35835/54A GB784328A (en) | 1954-12-10 | 1954-12-10 | Improvements in or relating to photo-electric machine guards |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB784328A true GB784328A (en) | 1957-10-09 |
Family
ID=10382028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35835/54A Expired GB784328A (en) | 1954-12-10 | 1954-12-10 | Improvements in or relating to photo-electric machine guards |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB784328A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0141677A2 (en) * | 1983-11-07 | 1985-05-15 | Nevio Filcich | Method and apparatus for machine safety |
| CN106870917A (en) * | 2017-03-17 | 2017-06-20 | 上海葛世工业自动化有限公司 | Efficient bender safe light curtain and bender control method |
-
1954
- 1954-12-10 GB GB35835/54A patent/GB784328A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0141677A2 (en) * | 1983-11-07 | 1985-05-15 | Nevio Filcich | Method and apparatus for machine safety |
| EP0141677A3 (en) * | 1983-11-07 | 1986-06-04 | Nevio Filcich | Method and apparatus for machine safety |
| US4660703A (en) * | 1983-11-07 | 1987-04-28 | Nevio Filcich | Method and apparatus for machine safety |
| CN106870917A (en) * | 2017-03-17 | 2017-06-20 | 上海葛世工业自动化有限公司 | Efficient bender safe light curtain and bender control method |
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