US2161918A - Improvements relating to registering mechanisms - Google Patents

Description

June 13, 1939.

J. FRASER 2,161,918

IMPROVEMENTS RELATING TO REGISTERING MECHANISMS Filed June 26, 1937 2 Sheets-Sheet 1 June 13, 1939. J. FRASER 2,161,913

IMPROVEMENTS RELATING TO REGISTERING MECHANISMS Filed June 26, 1937 2 Sheets-Sheet 2 fnzren for Patented June 13, 1939 UNITED STATES PATENT OFFICE INGME John Fraser, London, E Hardoll Limited Application June 26,

CHANISMS ngland, assignor to Avery- London, England 1937, Serial No. 150,634

In Great Britain July 10, 1936 1 Claim.

This invention has reference to improvements relating to registering mechanisms and is concerned more particularly with registering mechanism of the kind in which the price indica- 5 tions are marked on the peripheries of revoluble members and in which an indicator for a higher price denomination is turned through interrupted toothed gearing.

Price registering mechanism of the said kind is quite satisfactory generally speaking when decimal currencies are employed but in the case of sterling currencies the difiiculty arises that by virtue of an indicator of higher denomination commencing to turn when the indicator of lower denomination according to a decimal currency has completed nine tenths of a revolution in a sterling currency the shillings indicator consequently commences to turn when the pence indicator is registering say d since in sterling currency provision has to be made for twelve pence markings and twenty-four half-pence markings.

Furthermore with price computing mechanism for both decimal and sterling currencies it is most desirable that the drums for the higher denominations should assume fully the new indicating position immediately the drum of lower denomination has made a complete turn, that is in the case of sterling currencies the indicators of the shillings drum should be fully visible as soon as the pence drum has made a complete revolution likewise the tens of shillings drum when the shillings drum has made a complete revolution. Even with decimal registering mechanisms this condition is very difiicult to obtain owing to backlash in the gearing between the several drums so that it frequently happens that when a changeover has just been effected some of the numerals are not completely visible at a registering position.

The present invention has for its object the provision of an improved price registering mechanism of the said kind which enables a substantially full range of sterling price computations and indications to be obtained without the attendant difficulty referred to and which moreover provides for the drum of a higher denomination assuming the full indicating position immediately the preceding drum of lower denomination has made a complete turn.

The invention further resides in the details of construction of the improved price computing and indicating mechanism to be described hereinafter.

A convenient embodiment of the invention will now be described with particular reference to the accompanying drawings which illustrate the invention in its application to the price computing and indicating mechanism in conjunction with a liquid dispensing and measuring apparatus for liquid fuels for internal combustion engines described and illustrated in the British patent specification No. 465,347.

In the drawings:

Figure 1 is a longitudinal vertical section of suflicient of the improved price computing and indicating mechanism as is necessary to an understanding of the invention.

Figure 2 is an end view of the mechanism illustrated in Figure 1 looking in the direction of the arrow, and

Figure 3 is a transverse section taken on the plane indicated by the line 3-3 Figure 1 looking in the direction of the arrows to said line.

According to the said embodiment of the invention the price computing and indicating mechanism comprises three drums one A bearing 12 pence and twenty-four half-pence indications, one B for shillings and one C for tens of shillings, said drums A, B and C being mounted on a tubular shaft 4 in the manner referred to in detail in my aforesaid co-pending patent application.

The drum A or B drives the succeeding drum B or C through an interrupted toothed gear in the usual manner. The driving teeth of the interrupted driving gear for the pence drum A are formed on a plate 5 screwed to the disc 5 associated with the said drum A and these interrupted teeth co-operate with the teeth of a pinion 6 which is freely mounted on a shaft 1. This pinion 6 is fixed relatively to a concentric pinion 8 the teeth of which mesh with the teeth of the driving pinion 9 for the succeeding shillings drum B said pinion 8 being of greater diameter than the aforesaid driven pinion 6. Secured to the shillings drum B is a disc Hi to which is screwed a plate I0 carrying the interrupted teeth for this section of the drive the teeth carried by the said plate [0 meshing with the teeth of a pinion II which is also freely mounted on the shaft 1. Fixed relatively to the pinion II is a pinion [2 which transmits the drive to the driving pinion I3 of the tens of shillings drum C. The pinion I2 is of greater diameter than the co-operating driven pinion ll.

In. the embodiment of the invention illustrated in the drawings the interrupted toothed driving gear 5 if it were complete would have 35 teeth and the pinion 6 has 10 teeth. The pinion 8 has 10 teeth, and the pinion 9 has 20 teeth. The interrupted toothed driving gear ID if it were completed. would have 23.75 teeth and the pinion H which co-operates therewith has 10 teeth. The pinion l2 has 10 teeth and the pinion I 3, 20 teeth.

In View of the increase in the driving ratio between a drum of lower denomination and the succeeding drum of higher denomination the pence drum is enabled to register up to more than nine tenths of a revolution before a changeover takes place in the indications of the shillings drum.

In addition the construction described enables the member to be set initially so that its driving action is advanced by a few degrees in re1ation to the pence drum A thereby ensuring that the shillings drum B assumes the full indicating position whenever the pence drum A has made a complete revolution regardless of any backlash which may be present.

Although the invention is particularly suited for use With sterling currencies the invention is also applicable to decimal currencies.

What I claim is:

A registering mechanism comprising the combination of a plurality of revoluble indicators, a toothed plate carried by each of said indicators except that of the highest denomination and constituting an interrupted toothed gear for each indicator, said plate being set so that it will take up the drive slightly in advance of the position at which the toothed gearings would be set to take up the drive in a normal interrupted toothed registering mechanism, and gearing for transmitting movement from each toothed plate to the indicator of succeeding higher denomination said gearing being such that an indicator of higher denomination is turned at a faster rate than the preceding indicator of lower denomination, the faster rate of rotation of the succeeding indicators of higher denomination in conjunction with the advanced setting of the toothed plates ensuring that a succeeding indioator of higher denomination assumes the full indicating position whenever the indicator of lower denomination has made a complete revolution regardless of any backlash in the gearing which may be present.

JOHN FRASER.

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