Patent GB-580690-A (GB)
Title: Improvements in or relating to apparatus for registering of inspected articles or parts for quality control
IPC: G06M3/02
Filed: 1944-01-18
Abstract: 580,690. Counting-apparatus ; quality control. PUGH, C. A., and PLESSEY CO., Ltd. Jan. 18, 1944, No. 21267/43. [Class 106 (i)] Apparatus for registering quantities of inspected parts comprises one control member 13 adapted to be operated by the good parts and a second control member 14 by the bad parts, a counting means associated with each said control member and means operatively connected to both the counting means for giving warning signals when the relationship. of the numbers registered on the two counting means falls into predetermined fields. The invention relates to the gauging of sample batches of articles in the application of quality control. According to the required standards, wander plugs are inserted in selected sockets in a board 2 (also Fig. 2, not shown). The articles are gauged one by one and placed either in an accept hopper 13 or a reject hopper 14. The apparatus comprises four banks of switches A, B, C, D, each comprising three switches made up of a stator a<1>, a<2>, a<3>, b<1>, &c., and a rotor a<4>, a<5>, a<6>, b<4>, &c. The rotors are mounted on shafts a<7>, b<7>, c', d' aligned in pairs. Energization of a solenoid 31 through a ratchetwheel 34 on a sleeve 27 drives the units switch A one step at a time. At each revolution of the sleeve 27, a pawl 36 rides round a singlenotched disc 37 on a shaft 29 ordinarily held stationary and a pin 38 on a crank 35 carrying the pawl rotates a star-wheel 39 one-fifth of a revolution. A gear 41 on the shaft of the starwheel drives a gear 42 on a sleeve 30 bearing a ratchet 43 engaging a pawl 44 on an arm 45 fixed to the sleeve driving the tens switch B. A cancel solenoid 48 drives the switch D one step backwards at each impulse, while a reject solenoid 52 has two pawls 53, 54 for stepping on the switches C, D at each impulse. Zeroising.-Before use, the apparatus is zeroised by rocking a handle 19, a toothed quadrant 59 driving a pinion 60 on the shaft 29 and also a pinion 61 on a sleeve 62. Through the disc 37 and a disc 47 engaging a pawl 46 on the arm 45, the switches A and B are returned to zero. A disc 63 on the sleeve 62 engages a pawl 64 on an arm 65 to return the switch C to zero. At the same time the handle 19 drives a rotor 77, Figs. 3 and 5, so that a segment 79 engages a tag 80 to energize the coil 84 of a relay 85 which locks up through the energization of the coil 84a over contacts 87 if the rotor d<5> 5 is out of normal position. Further movement of the handle 19 causes a segment 78 to engage contacts 92 and the solenoid 48 energizes. An arm 102 on the armature 50 of the solenoid 48 acts as a circuit breaker on a switch 96 so that the solenoid 48 energizes intermittently to advance the switch D continuously until it reaches normal position when circuit is broken to the coil 84a at the rotor d<5>, and contacts 87, 88 open to break the circuit to the solenoid 48. A circuit through the rotors a<6>, b<6>, c<6>, d<6> and a lamp 8 indicates the apparatus to be in starting position. Operation.-In the example described, the wander plugs are set so that the apparatus will function as follows. It will denote acceptance if there are (1) no rejects in 20, (2) only one reject in 36, (3) only two rejects 'in 52 ; the apparatus will denote rejection if there are (4) 2 rejects in 20, (5) 3 rejects in 40, (6) 4 rejects in 60 parts ; (7) if there are 4 rejects in 64 parts, 100 per cent inspection will be necessary and (8) if there are only three rejects in 83 parts, acceptance of the batch is indicated. The connections made by the wander plugs are shown dotted in Fig. 5. With this setting, the cancel solenoid 48 operates at the acceptance of every 20 parts to drive the switch D one step in reverse. Insertion of an accepted part into the hopper 13 momentarily closes switches 66, 67 to energize the solenoid 31 which advances the switch A one step, and to energize the coil 84 momentarily. Insertion of a part into the reject hopper 14 momentarily closes a switch 68 to energize the solenoid 52 to advance the switches C, D one step. (1) If no rejects have occurred, as the twentieth part is put into the hopper 13, the units switch A completes two revolutions and the tens switch B makes its second step. Circuit is established through the O tag of stator a<1>, one of the tags at position 2 of stator b<1>, rotor b<4>, the other tag at position 2 of stator b<1>, the O tag on switch c<1>, the rotor c<4> to the accept lamp 9. (2) If a reject occurs in the first 20 parts, the first function does not take place. The reject advances the switches C, D one step so that the rotor c<4> is in position 1 and the circuit to the lamp 9 is not made at the acceptance of the twentieth part, but the switch D is returned to zero by the solenoid 48. If no further rejects occur, when 35 parts are accepted, circuit to lamp 9 is made over tag 5 on stator a<1>, the two tags 3 on stator b<1> and tag 1 on stator c<1>. (3) In a similar manner, if two rejects occur before 35 parts, but not before 20 are accepted, the D switch is again zeroised at the acceptance of 40 parts and lamp 9 lights up at the acceptance of 50 parts. (4) If two rejects occur in the first 21 parts, the solenoid 52 advances the switches C, D two steps and the reject lamp 11 lights up over tag 2 on stator d<1>. (5) If three rejects occur in 42 parts, acceptance of the first 20 zeroises the switch D, but the two further rejects advance the switch D and reject lamp 11 lights up. (6) If four rejects occur in 63 parts, the switch D is zeroised twice but reaches position 2 to light up the lamp 11. (7) If three rejects take place up to the 60th part accepted, the D switch is then in position 1. A fourth reject after the acceptance of the 60th part has zeroised the D switch advances it one step and advances the C switch to fourth position and lamp 10 lights up over tag 4 of stator c<2> to indicate that individual testing is necessary. (8) If three rejects occur in 83 tested parts, switch D is at zero and circuit through tag 0 of stator a<1>, the two tags 8 of stator b<1> to lamp 9 indicates acceptance. The lamps may be in parallel with buzzers 123.