US2128403A - Tens transmitting device for adding - Google Patents

Description

fug- 30 1938- T. o. R. DAHLBERG TENS TRANSMITTING DEVICE FOR ADING MACHINES I? SheeS-Sheiit ly Filed. Mav 18, 1935 Aug. 30, 1938. T. o. R. DAHLBERG 2,128,403

TENS TRANSMITTING DEVICE lFOR ADDING MACHINES Filed May 18, 1935 2 Sheets-Sheet @IML Patented Aug. 30, 1938 UNITED STATES PATENT OFFICE Tord Olof Rickard Dahlberg, Nockeby, Sweden Application May 18, 1935, Serial No. 22,148 In Sweden September 13, 1934 4 Claims.

The present invention relates to a tens transmitting device for adding machines having a disconnectable totalizer wheel shaft and having a counting rack displaceable on a setting bar, which is displaceable nine pitches, the said counting rack being adapted during the tens transmitting to be moved one pitch after the setting bar has returned to the Zero position and While the totalizer is still in engagement. The said tens transmitting device, which in the first place is intended to be used in cash registers, is made for the purpose of obtaining positive and safe tens transmitting. In constructing the device it has, therefore, been necessary to try to obtain a considerable reduction of the number of members constituting the tens transmitting means used heretofore at the same time as it has been necessary to pay attention thereto that already each separate part has worked reliably and safely and that a durable shape has been given to the same. The intended purpose has also been reached by the device according to the invention and the device is characterized substantially thereby that a pawl, which is pivotable on a stationary shaft, is adapted during tens transmitting to be brought into such position (operative position) by the counting wheel that it blocks a tens transmitting element moving parallel to the setting bar and forces the latter to change its position and to displace the said couting rack at the same time.

An embodiment of the invention is illustrated diagrammatically in the accompanying drawings, the parts constituting the device being shown in Figures 1 and 2 in two diiferent positions.

In the drawings, numeral I indicates the toothed wheel of the totalizer wheel 2, the shaft 3 of the former being displaceable towards and away from the counting rack 5, which is displaceable on the setting bar 4. The counting rack, which is guided by two pins 6 extending into longitudinal slots 'l provided in the rack 5 tends to be held in the position shown in Figure 1 by a spring 8. The setting bar 4 may be displaced nine pitches the slots l of the counting rack only admitting of a displacing movement of the last mentioned rack corresponding to one pitch. In the type of adding machines in question, as shown for instance in U. S. Patent No. 1,185,696, and U. S. Patent 2,091,758, this latter displacement, which occurs during the tens transmitting takes place after the setting bar has returned to the zero position, but while the totalizer is still in engagement, thus, when the parts assume the positions shown in Figure 1. In order that this tens transmitting Shal take place Positively there is, according to the invention, provided a pawl I pivotally disposed on a stationary shaft 9, the said pawl consisting of a two-armed lever in the embodiment shown. During the tens transmitting the said pawl is adapted to be brought into such operative position by means of a shoulder, pin or the like II of the totalizer 2 that it comes in the path of a tens transmitting element I2 movable in the return direction of the setting bar. The element I2 consists of a two-armed lever, which is pivotally connected parallel to a member I3 moving with the setting bar 4, the said member receiving its motion from a cam disk or the like. In its operative position the pawl I0 is adapted to force the tens transmitting element I2 to change its position whereby said counting rack is displaced.

To retain the pawl I0 in operative and inoperative position respectively there is provided a draw spring I4, one end of which is united with one end of the pawl Il) and the other end of which is fixed on a pin I5 so located relative to the pivot 9 of the pawl, that the lever I0, when it is between two stationary shoulders I6, I'I, which limit the pivoting movement of the pawl, will assume a position of unstable equilibrium. To return the tens carrier element I2 to the initial position there is a pressure spring I8.

When a ten is to be transmitted the pin I I of the totalizer wheel 2 of the next lower denomination actuates one end of the pawl IU and moves the pawl in the direction of the arrow indicated in Figure l, the pawl, when the position of unstable equilibrium has been passed, being automatically forced by the spring I4 over to the active position shown in Figure 2. The turning of the totalizer wheel takes place during the downwardly directed movement performed by the setting rack with connected counting rack in order to reach its resting or zero position. When the said position has been reached, the member I3 moves towards its lower end position, the pawl I0 blocking one end of the tens transmitting member I2, and its other end, which is being pivoted downwards, actuating the counting rack 5 representing the next higher value and displacing the same one pitch, a corresponding turning being imparted to the counting wheel, which is in engagement with the rack in question. After, in the above described manner, all tens have been released or transmitted in their proper turns the totalizer wheel shaft 3 together with totalizer wheels blocked thereon is displaced Aaway from the setting bar, whereby alsoy the counting rack 5 is released and by means of a spring 8 is returned to its initial position.

A pivotable link 20, which is provided with a projecting pin I9 or the like, upon each displacement of the totalizer Wheel shaft 3 away from the setting bar 4 forces the pawl I0 back to its inoperative initial position. The link 2U is actuated against a spring 2| by means of some suitable driving device, for example lever arm 22 -engaged with the totalizer wheel shaft 3 so as to transmit to link 20 a pivoting movement in the direction indicated by an arrow in Figure 2.

The operation is as follows. When the machine is started the counting wheels are out of engagement with the racks 5, the latter assuming the relative positions with respect to the bars 4 shown in Figure l. By key actuation the bars and racks of the machine are then caused to assume positions of various heights corresponding to various numerical values, but the positions of the bars 4 and racks 5 with respect to each other are, however, unchanged. When setting has taken place the counting wheels enter into engagement with the bars and racks and when the racks are moved in downward direction the wheels are rotated by amounts corresponding to the setting of the bars. If, however, the counting wheels, when entering into engagement with the racks, assume positions corresponding to the figure 999 and only the unit figure one has been entered on the machine, the pin II of the unit wheel, when the racks move downwards, will actuate, when the wheel passes from 9 to 0, the pawl I0 of the tens wheel and shift said pawl to the position shown in Figure 2. When the bars have reached their home or normal position, all of the members I3 begin to move downwards beginning with the tens member and continuing with the hundreds member etc. in their proper turns. During this movement the member I2, which is carried by the tens member I3, hits the corresponding pawl I0, by which the corresponding counting rack 5 is displaced one more pitch. During this operation the tens counting wheel is shifted from 9 to 0, whereupon the pin II of the said wheel shifts the pawl II corresponding to the hundreds wheel, and when the corresponding member I3 reaches its lower position the hundreds wheel, via the counting rack, is shifted from, 9 to 0, and in this manner the transmission is continued until all of the counting wheels have been shifted. After that the counting wheels move out of engagement with the racks and the members I3 move to their upper positions whereupon the bars 4 and racks 5 reassume the relative positions shown in Figure 1.

Several embodiments may of course be devised within the scope of the invention and the various members or elements may be shaped and also be combined in manifold different Ways.

Having now described my invention, what I claim. as new and desire to secure by Letters Patent is:

1. An adding machine comprising for each denomination a setting bar, a counting rack carried on and displaceable one pitch with respect to said setting bar, a reciprocating totalizer wheel adapted to be alternately engaged by and disconnected from said counting rack, a cam controlled member movable in a direction parallel to the counting rack, each member of the successive denominations being actuated in its proper turn when the setting bar is in its home position and the totalizer wheel is still in engagement with the counting rack, a displaceable abutment element disposed on said cam controlled member for engagement with the counting rack, means to normally keep said element in an inoperative position, a stationary support, a transfer initiating pawl pivoted on said support, means on the totalizer wheel of the next lower denomination to bring said pawl into a predetermined position in the path of said abutment element on said cam controlled member, when said totalizer wheel of the next lower denomination passes from nine to zero, and means to retain said pawl in said position, whereby said abutment element encounters said pawl during movement of said cam controlled member and is displaced so as to transmit one pitch of said movement to the counting rack and totalizer wheel.

2. The combination set forth in claim l, in L 4. The combination set forth in claim 1, in-

cluding further means arranged to be actuated by the reciprocating movement of said totalizer wheel and restoring said pawl to its inoperative position when said totalizer wheel is disconnected from said counting rack.

TORD OLOF RICKARD DAHLBERG.

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