Patent GB-340100-A (GB)
Title: Improvements in weight recording apparatus of the type controlled by a hand operated steelyard
IPC: G01G1/26
Filed: 1929-11-18
Abstract: 340,100. Weighing-apparatus. BROWN, S. C., 40, Gloucester Road, North Harrow, Middlesex. Nov. 18, 1929, No. 35138. [Class 143.] Printed records, apparatus for giving.-Relates to a hand-operated recording weigher such as that described in Specification 28626/12, [Class 143, Weighing-apparatus], wherein after true balance has been obtained the steelyard must be enclosed from interference before a record can be produced. The invention consists in (1) incorporating in the draw-rod which transfers the load to the steelyard, a spring or other automatic resistant for giving the operator an approximate indication of the load, (2) providing an indication (which may be in duplicate) of the true weight after the steelyard has been enclosed, (3) arranging the " click " detent of the type-wheels so as to project into the steelyard enclosure in order that the detent may be lifted by the operator out of engagement with the co-operating teeth during the adjustment of the poises, and (4) connecting the " click " detent to a further detent adapted to prevent a recording operation unless the. poise weights are correctly located in their notches and (5) providing a steelyard-locking device automatically put into action when the steelyard is both enclosed from interference and is in a state of equilibrium. The pull on the draw-rod 8, Fig. 4, is applied to the knifeedge 9 of the steelyard 1 through a spring 25 the compression of which is measured by a quadrant 31 and pointer 32 thus giving the operator an approximate indication, through a window in the casing, of the load on the machine. Indications of the true weight after the steelyard has been enclosed may be afforded by discs 7c, 7d, 7e, Fig: 5, attached to the type-wheels 7, 7a, 7b which are driven as usual from the poise racks 4a, 4b, 4c. In a modification, where the weight indications are visible both to the weighman and the carter through windows b, c, the indications are carried on two similar sets of wheels 34, 36, 37 driven by gearing 35 from the poise racks. When the minor poise weight is replaced by an automatic resistant and indicating mechanism as described in Specification 336,781, [Class 143, Weighing-apparatus], the indicating wheels 37 are replaced by a duplicate arrangement of the weight indications described in the prior Specification. In order to obscure the approximate weight indication when the true weight indication is exposed and vice versa, a masking plate 37b is connected by linkage to the locking bolt of the printing mechanism. The " click " detent levers previously used for accurately positioning the poise rack pinions 5a, Fig. 8, are replaced by a single detent lever 38 which extends into the accessible portion of the steelyard casing closed by the revolving shutter 11. The detent may thus be raised by hand from the pinions during the adjustment of the poise weights and thereby make adjustment easier. In order to ensure that the poises are correctly located in their notches before printing can be effected, the detent lever 38 is connected by a rod 39a to a further detent 39. If the shutter 11 is closed with a poise out of its notch a tongue 39b fails to enter one of the notches in the corresponding poise rack, and a further tongue 39c prevents the looking bolt 17 from moving to the right and thus unlocking the printing lever. In order to effect an automatic locking of the steelyard 10, Fig. 6, after being brought to equilibrium and enclosed by the shutter, the lever 16 (which rotates under spring action when the shutter closes) is provided with a roller 40 which enters an inclined groove 41 and clamps the steelyard against a stop block 10b.