GB1218412A - Improvements in or relating to guards for presses and like machinery - Google Patents
Improvements in or relating to guards for presses and like machineryInfo
- Publication number
- GB1218412A GB1218412A GB09277/68A GB1927768A GB1218412A GB 1218412 A GB1218412 A GB 1218412A GB 09277/68 A GB09277/68 A GB 09277/68A GB 1927768 A GB1927768 A GB 1927768A GB 1218412 A GB1218412 A GB 1218412A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- photo
- cells
- press
- energized
- 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
- 244000089486 Phragmites australis subsp australis Species 0.000 abstract 1
- 235000014676 Phragmites communis Nutrition 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000003760 hair shine Effects 0.000 abstract 1
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)
- Safety Devices In Control Systems (AREA)
Abstract
1,218,412. Machinery safety devices. RADIOVISOR PARENT Ltd. 18 April, 1969 [24 April, 1968], No. 19277/68. Heading F2J. [Also in Division G1] For testing the electronic circuit of a light guard for a press, wherein a set of spaced apart electric lamps (not shown) shines on a corresponding number of series-connected photo-cells P1-P12 controlling a relay Rel, interruption of the guard de-energizing the relay to cause stopping of the press, diodes D1-D12 are connected to the anodes of respective photo-cells P1-P12 and the photo-cells and diodes are connected in circuit with changeover contacts Re2/3 and Re2/reeds of a relay Re2 so that when the relay Re2 is energized the photo-cells are connected in parallel, via the diodes, allowing a fault in any one to be detected. The output of the photo-cells controls the relay Re1 via an amplifier including transistors TR1-TR3. Initially all five relays Re1-Re5 in the control system are de-energized, and the guard lamps are dimmed. To prepare the system for operation, a reset button A is pressed to energize the relay Re2 to parallel the photo-cells. If there is no fault, relay Re1 is not energized, allowing relay Re4 to latch in. Pressing the " machine start " switch energizes relay Re3, bringing the guard lamps to full brilliance so that relay Re1 is energized and the press starting circuit is completed via terminal 16, contacts Re4/3, Re3/3, Re1/2, Re5/2, terminal 9, and contact S2. Near the end of the press cycle, a cam (not shown) closes a TEST switch 19, 20, 21 to energize relay Re2 for a period determined by the time constant of a capacitor C2 and a potentiometer P2<SP>1</SP>. Relay Re3 is de-energized via transistors TR5, TR6 to dim the lamps and open the press circuit. The photo-cells are paralleled. A fault would keep relay Re1 energized, breaking the holding circuit of relay Re4 to prevent further press operation. With the press standing idle, a fault, e.g. sun shining into the photo-cells, would energize relay Re1 to prevent energization of relay Re3 by the atart switch. A relay Re5 is operable by a key switch to by-pass the safety circuits, so that the press may be operated for tool setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB09277/68A GB1218412A (en) | 1968-04-24 | 1968-04-24 | Improvements in or relating to guards for presses and like machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB09277/68A GB1218412A (en) | 1968-04-24 | 1968-04-24 | Improvements in or relating to guards for presses and like machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1218412A true GB1218412A (en) | 1971-01-06 |
Family
ID=10126721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB09277/68A Expired GB1218412A (en) | 1968-04-24 | 1968-04-24 | Improvements in or relating to guards for presses and like machinery |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1218412A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0007420A1 (en) * | 1978-07-14 | 1980-02-06 | Erwin Sick GmbH Optik-Elektronik | Safety circuit for a potentially dangerous machine monitored by light |
| FR2434332A1 (en) * | 1978-08-25 | 1980-03-21 | Datalogic Spa | PHOTOELECTRIC BARRIER BELONGING TO AN ACCIDENT SAFETY DEVICE FOR MACHINE TOOLS |
| US4309696A (en) * | 1978-06-26 | 1982-01-05 | Kabushiki Kaisha Komatsu Seisakusho | Trouble detecting unit in an optical security device |
| WO2009013044A1 (en) * | 2007-07-26 | 2009-01-29 | Robert Bosch Gmbh | Equipment protection device |
-
1968
- 1968-04-24 GB GB09277/68A patent/GB1218412A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4309696A (en) * | 1978-06-26 | 1982-01-05 | Kabushiki Kaisha Komatsu Seisakusho | Trouble detecting unit in an optical security device |
| EP0007420A1 (en) * | 1978-07-14 | 1980-02-06 | Erwin Sick GmbH Optik-Elektronik | Safety circuit for a potentially dangerous machine monitored by light |
| US4291359A (en) | 1978-07-14 | 1981-09-22 | Erwin Sick Gmbh Optik-Elektronik | Safety circuit for a potentially dangerous machine monitored by light |
| FR2434332A1 (en) * | 1978-08-25 | 1980-03-21 | Datalogic Spa | PHOTOELECTRIC BARRIER BELONGING TO AN ACCIDENT SAFETY DEVICE FOR MACHINE TOOLS |
| WO2009013044A1 (en) * | 2007-07-26 | 2009-01-29 | Robert Bosch Gmbh | Equipment protection device |
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