DE461039C - Device on calculating machines to lock the sum lever when pulling over the machine - Google Patents

Description

Device on calculating machines to lock the sum lever when pulling over the machine. To get the imprint of an incorrect negative balance or overlay prevent, it has already been suggested when pulling the machine or when In an overdone state, add the sum lever to the same (calculation below zero) block or until you return to the o-position? or if this is blocked to hold and at the same time to indicate the covered state of the machine to the outside.

The invention relates to a new device for achieving the above Purpose. «- which is characterized by its particular simplicity. It essentially consists in this. <iaß after the highest digit bam furthest to the left) Counting wheels a further pair of gears is provided, whose switching cams with such widened stop parts of the associated transmission lever (in the Counting wheels ten switch lever) for the total love lock work together that this transmission love so long in a pivoted position, d. H. the sum lever is kept locked until the machine is calculating in the o-position returns or exceeds this.

The wheels of the gear pair are expedient by arrangement a corresponding Angchlagergans can only be rotated forwards and backwards by one tooth pitch, so that they can be used for multiple calculations below zero (additions and Subtractions) stop in the position that was rotated for the first time and when you return in the o-position or when it is exceeded by only one tooth pitch can move back.

On the drawing is an example of the installation according to of the invention at a next to the relevant parts in the longitudinal direction the machine-guided vertical section.

Next to the pair of counting wheels furthest to the left in the counter, a further pair of gears c, d is arranged on its axes a Projecting into the gap, a stop pin e is provided which, by striking one or the other of the two teeth f, ä delimiting the gap, causes the two intermeshing gears c, d to rotate forward and backward only at one tooth pitch can.

Of the two peeling cams la and i. of the 1; two gears, which take the position shown in the drawing before a ten switch occurs, the switching cam I2 of the gear c, which corresponds to the subtraction wheels of the counter, works together with a stop part k of the transmission lever, which, like the ten switch levers adjoining it, the The associated locking lever is raised in the manner shown on the right-hand lever arm until a ten switch occurs.

The mode of operation of the new device is as follows: When pulling over of the machine, in which, as is well known, in the counter the complement number of the o-position subtracted value is registered, the ten circuits of all counting wheel pairs occur in function.

Through the well-known ten shift mechanisms (ten shift lever, locking lever and stop member) of the last pair of counting wheels adjoining the pair of gears c, d consequently the stop member n is raised. The dental arch that becomes free as a result o moves .sich through the example from German patent specification 272 876 known institutions to a tooth pitch to the left and causes a Rotation of the gears c and d by one tooth pitch in the right or left direction.

This is up to the stop. of the tooth g on the stop pin c rotating gear c pivoted with its switching cam h on the stop part k the transmission lever l in the right direction. The one here to trigger. Arriving locking lever in is also pivoted in the right direction under the action of its spring q and causes the total lever to be locked in a known manner by means of a lifting rail y of a double lever and an adjoining locking rail. As a result of the illustrated embodiment of the stop part k, the transmission lever l is pivoted by the switching cam h, ie the sum lever is kept locked until the gears c, d rotate back into the position shown.

This is done by the z. B. from the aforementioned patent known devices for returning the dental arch in the normal position Return of the machine to the o-position or when crossing the same.

With the mentioned clockwise rotation when pulling the machine over of the gear c occurs a mark s in attached to an outer rim of the same a viewing opening t of the counter housing, whereby the coated state of the Machine becomes visible to the outside.

In the case of the adjustment of the counter necessary for the purpose of performing an addition, in which the switching cam h releases the stop part k, the switching cam i of the gear d acts instead on the stop part u of the transmission lever, so that this also occurs when the additions are carried out in the overdeveloped state Machine swiveled out until the o-position is exceeded, ie the sum lever remains locked.

Claims (3)

PATENT CLAIMS: i. Device on calculating machines for locking the sum lever when the machine is overdrawn or when calculating in the overdeveloped state of the same (calculating below zero), characterized in that a further pair of gears (c, d) is provided next to the highest-digit counting wheel pair, the switching cams (h, i) cooperate with such widened stop parts (k, u) of the associated transfer lever (l) for the sum lever locking that this transfer lever (L) is kept in the pivoted position, ie the sum lever is locked until the machine is calculating in the o position returns or exceeds it. 2. Device according to claim i, characterized in that that the wheels (c, d) of the pair of gears expediently by arranging a corresponding Stop member (s) can only be rotated back and forth by one tooth pitch, so that it is rotated for the first time in the case of multiple calculations that take place below zero Stand still and when returning to the o-position or when exceeding it the same can only move back one tooth pitch. 3. Set up after Claims i and 2, characterized in that one of the two gears (c) is expedient is provided with a mark (s) on a special outer wreath to indicate the coated state when the machine is pulled over in an inspection opening (t) becomes visible.