Патент USA US2134391код для вставки
Oct. 25, 193,8. D. J. ANGUS 2,134,391 REROLL DRIVE MECHANISM FOR GRAPHIC METERS Filed April 6, 1937 fful l „V BY „72% ATTORNEYS. 2,134,391" Patented Oct. 25, 1938 UNITED STATES PATENT oFEicE 2,134,391 REROLL DRIVE MECHANISM FOR GRAPHIC METERS Donald J. Angus, Indianapolis, Ind. Application April 6, 1937, Serial No. 135,264 2 Claims. (C1. 18S-_37) spring-winding Adirection (as in unrolling the with the gear 2li and driving a gear 22, and a pinion 23 fast on the shaft I8 which drives the re-roll roller I2. Between the pinion 2| and the gear 22, how record sheet for inspection) without danger of over-,winding the spring and without being lim ited by full winding of the spring, but also without undue shock stops the spring-unwinding move 2| is> fast on a shaft 25. Also fast on that shaft 25 is a disk 2S. The gear 22 is loose on the shaft It is the object of my invention to provide for graphic meters a re-roll drive mechanism which not only permits rotation of the re-roll roller in 3 ment of the re-roll roller if such movement is too rapid, as on breakage of the paper or failure of the supply of paper. With that end in view, I provide in the driving mechanism for the re-roll roller a slipping clutch which slips upon undue spring-winding move " ment of the re-roll roller; and also provide a light-weight member frictionally connected with the re-roll roller so that it may slip under stress, and provide on that light-weight member a cen ever, the driving connection is not positive, but frictional and slippable. To that end, the pinion 25; but it lies in frictional engagement with the disk 26, into which frictional engagement it is forced by a coiled compression spring 2l lying be tween the gear 22 and a flange 28 of the pinion 2 I. By reason of the frictional engagement between the disk 26 and the gear 22, relative rotation is permitted between the pinion 2| and the gear 22, 15 as may be required; but the friction is suñiciently great so that it is normally adequate for driving the re-roll roller |2. 20 a stop-pin to stop the light-weight member and Loose on the shaft I8 of the re-roll roller is a spool 30, which has a frictional engagement on thereby gently stop the re-roll roller Without undue shock upon too rapid spring-unwinding A coiled compression spring 32 on the other side trifugally operated part which cooperates with one side with a disk 3| fixed to said shaft I8. of said spool 30, and lying between said spool and . the pinion 23, maintains the frictional engage The accompanying drawing illustrates my in vention: Fig. 1 is a vertical section, substantially ment between the spool 30 and the disk 3|. The on the line I-I of Fig. 2, through a driving spool 3U is light in weight, so that when its mechanism embodying my invention; Fig. 2 isv movement is stopped by the stop shoulder 34 a fragmentary side elevation of the mechanism its stoppage requires little force. Within the groove of the spool 3l) is pivoted a shown in Fig. l, with some parts broken away; stop-member 33, provided with a stop-shoulder 34 and Figs. 3 and 4 are enlarged transverse sec 30 for cooperating with a pin 35 flxedly mounted in tions, on the line 3-4 of Fig. 1, through the light the frame-work of the meter. The stop-member weight, centrifugally operated, frictionally mount ed, stopping mechanism, with the centrifugally 33, as shown, is of a general U-shape (Figs. 3 and operated members in its inner and outer positions 4), with its supporting pivot 33a at the base of movement of the re-roll roller. 35 respectively. The graphic meter may be of any desired type, in which a record sheet III or traveling chart is driven at predetermined speed by and over a feed-roll II, from which it passes to a re-roll 40 roller l2 on which it is rewound. The feed-roll l I may be driven in any suitable manner, not involved in the present invention; and a graph is made on the record in any suitable manner, well understood. the U and with one arm somewhat heavier than 35 the other so that that heavier arm will move out ward by centrifugal force if the rotation of the spool 30 is too rapid. That heavier arm, which is thus thrown outward by centrifugal force, is the 40 one which carries the stop-shoulder 34. In order to avoid the necessity for any spring for normally holding the stop member 33 re tracted within the groove of the spool 30, the pin 35 is preferably located so that it will not be engaged by the stop-shoulder 34 if in the course of slow rotation of the spool 30 the heavier arm of the stop-member 33 drops out of the spool groove by gravity. To that end, the stop-pin 35 is desirably located, as illustrated in Figs. 3 and 4, 50 slightly above the horizontal plane of the shaft |8 on that side of the spool 3|) which travels The re-roll roller I2 is driven by a suitable coil spring I5, shown as windable by a key on a stem I6, which is held against backward move ment by a ratchet mechanism I6'. For such driving, one end of the spring I5 is suitably con 50 nected to a gear I'I; which is connected through a train of gears to a shaft I8 carrying and driv ingly connected to one end of the re-roll roller I2 in any suitable manner. As shown, that driving - downward in the normal spring-driven movement train includes a pinion I9 meshing with the gear of the re-roll roller I2. In operation: 55 I'I and ñxed to a gear 20, a pinion 2| meshing 45 2 2,134,391 The spring I5 is Wound in the usual manner, by a key on the stem I6. The spring I5 drives the re-roll roller I2 through the intervening gearing; which driving occurs with no normal slipping between the gear 22 and the disk 26. If with the spring I5 wound or nearly wound the operator winds the re-rcll roller I2 backward, as by unrolling the re-rolled record chart to see what its showing was at some earlier time or over some earlier period, and thus moves the gear I'I backward to cause winding of the spring I5, no breakage occurs when and if the spring I5 reaches fully wound condition, because such slipping then due shock. I claim as my invention: 1. In a graphic meter, the combination of a 5 re-roll roller, a driving spring therefor, a driving connection interconnecting said driving spring and said re~roll roller, a light-weight rotatable member frictionally interconnected with said re roll roller and provided with a centrifugally 10 actuated part having a stop-shoulder, and a stop pin in a position to be engaged by said stop shoulder on centrifugal actuation of said cen trifugally actuated part to stop said light-weight occurs between the gear 22 and the disk 26 as may be necessary to accommodate the excess move member and thereby after some slipping at the 15 ment of the re-roll roller I2 after the Spring I5 member and the re-roll roller to cause a gentle is fully wound. v away in the event it somehow gets free, but the mechanism is nevertheless guarded against un frictional connection between said light-weight stopping of the latter. If for any reason the re-roll roller I2 starts to 2. In a graphic meter, the combination of a rotate forward too rapidly, or in the spring-un re-rcll roller, a driving spring therefor, a driving 20 winding direction, as because the record sheet connection interconnecting said driving spring breaks or the supply of record sheet is exhausted and said re-roll roller, a light-weight rotatable or the operator suddenly releases the unrolled member frictionally interconnected with said re record sheet, the excessive speed of rotation roll roller and provided with a centrifugally ac causes the heavier arm of the U-shaped stop tuated part having a stop-shoulder, a stop-pin in member to ily outward so that the stop-shoulder a position to be engaged by said stop-shoulder on 34 will strike the pin 35. This stops the spool 3U centrifugal actuation of said centrifugally actu abruptly. But the hammer-blow between the ated part to stop said light-weight member and stop-shoulder 34 and the pin 35 is relatively thereby after some slipping at the írîctional con light, because the frictional mounting of the spool nection between said light-weight member and 30 30 on the shaft I8 permits such shaft I8 and the the re-roll roller to cause a gentle stopping of the re-roll roller and the parts geared thereto to be latter, said driving connection between the re brought to a relatively gentle stop by reason of roll roller and the spring including a frictional the slipping, usually for only a part of a revolu drive which permits slipping on reverse winding tion, between the spool 30 and the disk 3I. Thus of the re-roll roller with the spring wound. 35 the re-roll roller I2 is prevented from running DONALD J. ANGUS.