1. A method of welding together in a welding area the ends of a web segment comprising a thermally weldable material to form an endless loop belt with a welded seam; comprising compressing the overlapped ends of said web segment in said welding area with a weld-splash confining laser-light transmissive glass plate, and applying sufficient laser-light energy through said laser-light transmissive glass plate to said ends of said web segment in said weld area to thermally weld said ends together into a smoothly welded seam;
wherein said ends of said web segment are held under pressure in said welding area by being compressed between a holding system on one side of said web segment ends and said weld-splash confining laser-light transmissive glass plate on the other side of said web segment ends;
and wherein said weld-splash confining laser-light transmissive glass plate has a smoothly slightly concave surface in said welding area to effectively provide a weld spash mold to conform said weld splash thereto to provide said smoothly welded seam.
2. The method of welding together in a welding area the ends of a web segment comprising a thermally weldable material to form an endless belt with a welded seam of claim 1, wherein said endless belt is a xerographic photoreceptor belt.
3. The method of welding together in a welding area the ends of a web segment comprising a thermally weldable material to form an endless belt with a welded seam of claim 1, wherein said endless belt is an intermediate image transfer belt.
4. The method of welding together in a welding area the ends of a web segment comprising a thermally weldable material to form an endless belt with a welded seam of claim 1, wherein said holding system on one side of said web segment is a pneumatic holddown system with a planar surface opposite from said weld-splash confining laser-light transmissive glass plate.
5. The method of welding together in a welding area the ends of a web segment comprising a thermally weldable material to form an endless belt with a welded seam of claim 1, wherein said weld-splash confining laser-light transmissive glass plate has a slightly parabolic surface in said welding area.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A safety and arming unit for a fuse, the safety and arming unit comprising:
a firing chain having first and second firing devices defining an intermediate space therebetween and a barrier blocking said intermediate space in a safe position, said barrier being brought into an armed position by a releasing movement vacating said intermediate space;
first and second mutually independent securing devices locking said barrier in said safe position and executing an unlocking action based on two mutually independent physical arming parameters; and
an unlocking device for moving said barrier into said armed position.
2. The safety and arming unit according to claim 1, wherein said firing devices remain at rest relative to one another during said releasing movement.
3. The safety and arming unit according to claim 1, wherein said first securing device is configured to directly mechanically change said arming parameter into said unlocking action.
4. The safety and arming unit according to claim 1, which further comprises an electronic control unit for initiating said unlocking action of said second securing device.
5. The safety and arming unit according to claim 1, wherein said second securing device is configured to mechanically release said barrier for carrying out said releasing movement by said unlocking action.
6. The safety and arming unit according to claim 1, wherein said first securing device has a double-bolt system.
7. The safety and arming unit according to claim 1, wherein said barrier experiences a radially outward releasing movement due to spin.
8. The safety and arming unit according to claim 1, wherein said first securing device is configured to charge said unlocking device by an unlocking action.
9. The safety and arming unit according to claim 8, wherein said first securing device has a face disposed at an angle relative to an unlocking direction, said face, upon moving in an unlocking direction, producing a charge by movement of a charging device along said face.
10. The safety and arming unit according to claim 1, wherein said first firing device includes a projectile for firing said second firing device.
11. A safety and arming unit for a fuse, the safety and arming unit comprising:
a firing chain having first and second firing devices defining an intermediate space there between and a barrier blocking said intermediate space in a safe position, said barrier being brought into an armed position by a releasing movement vacating said intermediate space;
first and second mutually independent securing devices locking said barrier in said safe position and executing an unlocking action based on two mutually independent physical arming parameters; and
an electronic control unit and two sensors connected to said electronic control unit for sensing two different arming parameters and controlling said unlocking action of said second securing device on a basis of said two arming parameters.
12. A safety and arming unit for a fuse, the safety and arming unit comprising:
a firing chain having first and second firing devices defining an intermediate space there between and a barrier blocking said intermediate space in a safe position, said barrier being brought into an armed position by a releasing movement vacating said intermediate space;
first and second mutually independent securing devices locking said barrier in said safe position and executing an unlocking action based on two mutually independent physical arming parameters;
said second securing device including a charging device for carrying out said unlocking action by a discharge;
a holding element configured to hold said barrier; and
another element of said securing device;
said discharge separating and discarding said holding element from said other element of said securing device.
13. The safety and arming unit according to claim 12, wherein said charging device has a pyrotechnic charge.
14. A safety and arming unit for a fuse, the safety and arming unit comprising:
a firing chain having first and second firing devices defining an intermediate space there between and a barrier blocking said intermediate space in a safe position, said barrier being brought into an armed position by a releasing movement vacating said intermediate space: and
first and second mutually independent securing devices locking said barrier in said safe position and executing an unlocking action based on two mutually independent physical arming parameters:
said barrier having one zone of relatively harder metal between said firing devices and a further zone of relatively softer metal outside of said one zone.