Patent GB-1282542-A (GB)
Title: Machine for producing spinning bores
IPC: B21D28/20
Filed: 1970-01-22
Abstract: 1282542 Making Spinnerettes GLANZSTOFF AG 22 Jan 1970 [22 Jan 1969] 3115/70 Heading B3A [Also in Division G3] Apparatus for making bores in thin walled spinnerets of noble metals or their alloys, comprises a turntable 59 mounted on a support 60 and accommodates a punching template 62 and a die blank. Electric motors 51, 53 are connected through clutches 52, 54 to the turntable and support respectively and a tracer pin or feeler 5, which engages in recesses 61 in the template, is connected to means controlling displacement of the support. The motors 51, 53 are started and run continuously throughout a work cycle. A pushbutton 1, Fig. 3, is actuated to erase a store 3, thereby releasing the first AND-input on a timing element 4. An L-signal is transmitted through a resistance 6 to the second AND-input of the element 4. After a time lapse, pulses are transmitted through a digital converter 7, a NOR-gate 8, an amplifier 9, to a magnetic valve 10, Fig. 1, which is opened to release the pressure in a cylinder 12, thereby pivoting a lever 13 downwardly to drive the punch 16 by a cam 15 to make the first hole. Movement of the lever 13 releases the feeler 17, thereby generating an L-signal, which cancels a store 20 through a resistance 18 and through a NOR-gate 21 blocks an amplifier 22. On the return stroke of the lever, the feeler 17 sends an impulse through a resistance 19 and capacitor 23 to activate the store 20 through a digital converter 24, which maintains the signal for a period when the clutch 52 is engaged by a signal through the NOR-gate 21 and amplifier 22 thereby rotating the turntable 59. The feeler is thus reversed so that the sacond AND-input of the gate 4 is blocked to prevent generation of a punching impulse. As the feeler 5 enters the next template hole 61, a pulse is transmitted through capacitor 26, a digital converter 27, AND-gate 25, store 20 and the NOR-gate 21 to block the amplifier 22 and disengage the clutch 52. At the same time the second AND-input of the timing element 4 receives an L-signal through the resistor 6 so that a second hole is punched. After a circle of holes has been punched, a feeler 28 is actuated to energize a digital converter 31. A store 39 is erased through an AND-gate 32 and through an amplifier 34 engages the clutch 54, whereby the die support 60 and feeler 5 are moved into alignment with the next circle of holes 61. When in alignment a feeler 37 reaches a stop position to activate the store 39, thereby disengaging the clutch 54, and simultaneously to activate the store 20 through a capacitor 40, and a digital converter 41 to commence punching a further row of holes. When the last hole of a complete cycle has been punched, and the turntable is rotated and the feeler 28 moves into engagement with a feeler 42. The motor 53 is then reversed through a relay 43, the clutch 54 engaged and a magnet 36 energized to withdraw the feeler 5. When the feeler 42 is disengaged the direction of the motor 53 is again reversed. The store 39, which has been cancelled by the relay 43 through a resistor 46 is again activated to release the feeler 37, thereby re-setting the apparatus for the commencement of a further cycle of punching operations.  A work cycle can be interrupted by opening a switch 47 to pass a signal through a resistor 48 to the store 3 and block the first AND-input of the timing element 4. To restart the cycle, the switch 47 is closed and the push-button 1 actuated. The clutches 52, 54 may be disengaged for setting the apparatus or for fault detection. The condition of the punch is monitored, e.g., by comparison with a standard tool, after the completion of punching each row of holes, or more frequently. Alternatively two lenses with a light source and associated photo-cell are used and any damage or wear on the tool will result in different light intensity in comparison with a standard tool. Such difference may be indicated or used to shut down the apparatus. A modified form of the apparatus is used in making spinnerets having up to 20,000 bores. The drive 53 initially only radially displaces the die blank and it is coupled to a control roller 69, which has a square thread with a number of recesses 70 therein. When a circle of holes has been completed, the support drive is actuated and the roller 69 is rotated until a feeler pin 71 engages in one of the recesses 70. This switches on a drive for the feeler pin 5 which is then moved to the next circle of holes. If the feeler 71 is not in a recess at the completion of rotation of the roller 69, the pin still engages in the same row of holes in the template during the next part of the work cycle.