US2359661A

US2359661A - Calculating machine

Info

Publication number: US2359661A
Authority: US
Publication date: 1944-10-03
Anticipated expiration: 1961-10-03

Description

Oct. 3, 1944. J MQQDY 2,359,661

CALCULATING MACHINE Filed Aug. 24, l9 42 F'IE 4 doyT 'oaa y I ATTORN EY Patented Oct. 3, 194 4: V

v UNITED 'STATES PATENT. OFFICE I I v Q clwntzfiffi um I John 14 Moody. Oakland. Calii'.'. assignor to Friden Calculating Machine Co.,Inc., a corporation of California I a. Application Augusta, 1942 ,'Serial No. 455,849

Claims. (crass-131) 1 This invention relates to calculating machines and is concernedmore particularly with the pro- It is an object of the invention to. provideimproved centralizing and overthrow preventing lating machine.

- Another object of the invention is to provide a mechanism of theabove character in which the centralizingmeans provides an effective centralsimplified construction to .provide an effective quiet action employing lighter springs than commonly-used for the same purpose- Other objects and advantageswill be apparent from the following'description .of: a, preferred embodiment thereof, as illustrated in the 'accompanying drawing, in which:-

Figure 1 is asectional elevationalview of a part of a register of a calculating machinetaken in the plane indicated by the line in Figure 2.

Figure 2 is a transverse sectional view through the register carriage of a calculating machine, the view being taken as indicated by the line 2--2 in Figure 1.

Figure 3 is a sectional elevational view of the elements of the centralizing and overthrow preventing means of the invention.

Figure 4 is a view similar to Figure 3 but showing the parts as the dial'is being moved clockwise from one position to another.

Figure' 5 is a view similar to Figure 4, but showing the dial turned slightly further toward the second position.

The invention is illustrated as embodied in the type of calculatim machine shown in the patent to Carl M. Friden, No. 2,229,889, dated January 28, 1941. Referring to Figures 1 and 2 the machine includes a register frame indicated generally at In which may be made up of opposed halves II and I2 formed of sheet metal and having auxiliary angle frame members l3 and I4 suitably secured thereon. Halves II and I2 of the carriage frame may be suitably secured together to embrace and provide bearings for numeral wheel or dial shafts IS on which the dials 11 are provided. Intermediate its end each dial shaft I6 is provided with a resetting gear l8 while at its lower end it is provided with a ten-tooth gear I! vision of improved centralizing and overthrow 'preventingmeansfor the register wheels or dials thereof.

a means for the register wheels or dials of a calcu for receiving increments of movement in causing registration on the dial. These parts are of the construction shown in said patent.

For purposes of causing centralizing of the dial in any value displaying position as well as we venting overthrow beyond such position, means are provided of special double pawl construction which minimizes resistance to movement ofthe dial while providing a strong centralizing and anti-overthrow action. This'means for controlling the, positioning of the dial preferably includes a star-wheel 2| (Figures 1 to 3) having ten equally v spaced-apart depressions corresponding in alignment toithe'ten equally spaced-apart figures on the dial l1 and the ten-teeth of gear l9.

, A pair of centralizing and overthrow preventing pawls are provided to cooperate with'each starwheel 2| including a main pawl 22 and an auxiliary pawl 23. Pawl 22 has an'opening 24 for journalling about bearing 26 for an adjacent dial shaft l6 immediately below the star-wheel 2| of such dial shaft. The right-hand pawl 22 (Figare 1) is journalled about a bearing 26 having a sions of star-wheel 2|.

dummy shaft 28 therein. Auxiliary pawl 23 is pivoted to main pawl 22 by stud 29 and is connected to pawl 22 by means of spring 30. Both

pawls

22 and 23 have their ends formed triangular to seat in the complemental depressions, of the star-wheel 2|.

Pawls

22 and 23 are dimensioned to engage in opposite depres- The operation of the mechanism will be described assuming a one-step clockwise movement of dial shaft |6 and starwheel 2| from the Figure 3 position. As the starwheel 2| starts to turn from the position shown in Figure 3 to that shown in Figure 4, both

pawls

22 and 23 resist such movement and are cammed outwardly. The rocking of the pawl 22 in a counterclockwise direction as viewed in Figure 4, translates the pawl 23 to the left at the same time that it is also rocked outwardly by the star-wheel 2|. As a result before the star wheel 2| completes half of its movement, the pawl 23 reaches the mid-point of the adjacent triangular depressions as shown in Figure 4 and will start to descend a face of a recess as shown in Figure 5 before the point of pawl 22 reaches its cooperating midpoint. In the opposite direction of movement pawl 22 passes over the'adjacent high point of the star-wheel before pawl 23. In each instance, the pawl which just passes over a high point tends to cam the dial ahead and counter-acts in part the dragging action of the second pawl.

With the type of double pawl action provided herein it is impossible for the dial to stop out oiposition; because when the nose of one pawl is engaging a'high point of the star wheel, the other pawl exerts a camming action urging the star wheel to properly centered position, in other words the points of the

pawls

22 and 23 never simultaneously engage points of the star wheel 2|. This is effected by mounting the pawl 23 eccentrically on the pawl 22. Also the agitating action of the pawl 23 as long as the star wheel is turning tends to prevent the star wheel from coming to rest out of a position where both pawls are seated in depressions of the wheel.

I claim:

1. In a calculating machine, a register dial rotatable to a plurality of value-displayin positions, a centralizing element mounted for rotation with said dial, having a series of centralizing depressions and centralizing means for engaging said depression including a pivoted centralizing pawl spring-urged to engage said element, and a second centralizing pawl, pivoted on said first-named pawl and spring-urged to engage said element in opposed relation to said first named pawl.

2. In a calculating machine, a register dial rotatable to a plurality of value-displaying positions, a centralizing element mounted for rotation with said dial and having a series of centralizing means for engaging said element including a pivotally mounted centralizing pawl and a second centralizin pawl pivoted on said first-named pawl, and spring means connected between said pawls to cause them to engage opposite depressions in said element.

3. In a calculating machine, a register dial rotatable to. a plurality of value displaying positions, a centralizing element mounted for rotation, with said dial having a series of centralizing 7 depressions, centralizing members springurged to engage said element in opposite depressions thereof, means to provide a support for the first of said members to permit oscillation of said member about an axis parallel to the axis of rotation of said centralizing element, a pivotal sup port on said first member for the second member to permit oscillation of the second member about an axis parallel to the axis of rotation of said centralizing element, said pivotal support 01' the second member being disposed eccentrically of the axis of rotation of the first member so that oscillation of the first member causes shifting of the pivotal axis of the second member.

,4. In a calculating machine, a register dial rofirst of said members to permit oscillation of said member about an axis parallel to the axis of rotation of said centralizing element, a pivotal support on said first member for the second member to permit oscillation of the second member about an axis parallel to the axi of rotation of said centralizing element, said pivotal support of the second member being disposed eccentrically of the axis of rotation of the first member so that oscillation of the first member causes shifting of the pivotal axis or the second member toward said centralizing \element.

5. In a calculating machine, a register dial rotatable to a plurality of value displaying positions, a centralizing element mounted for rotation with said dial having a series of centralizing depressions, centralizing members springurged to engage said element in opposite depressions thereof, means to provide a. support for the first of said members to permit oscillation of said member about an axis parallel to the axis of rotation of said centralizing element, a pivotal support for the second member to permit oscillation of the second member about an axis parallel to the axis of rotation of said centralizing element, and means to connect said first member to said pivotal support of said second member so that oscillation of the first member causes a change in position of the pivotal axis of the second memher.

6. In a calculating machine, a register dial rotatable to a plurality of value displaying positions, a star wheel having ten points thereon and mounted for rotation with said dial, a pair of centralizing pawls spring-urged into engagement with said star wheel and each having a V-shaped portion for engaging diametrically opposite depressions intermediate th points Of said star wheel when said star wheel has been centralized by said pawls in a value displaying position, and means to connect the second pawl to the first pawl so that oscillation of the first pawl causes displacement of the second pawl whereby the V- shaped portion's of said pawls are unable to simultaneously engage points or said star wheel JOHN L. MOODY.