DE843908C - Equipment on adding and accounting machines to intercept the rebound effect of the type carriers and their control organs - Google Patents

Description

Equipment on adding and accounting machines to absorb the rebound effect the type carrier and its control organs In calculating machines that are used for addition and Booking can be used and the racks or toothed segments driven by springs own, occur when the same impact on the fixed tax stop inadmissible Reboundings and vibrations of the racks or tooth segments and thus also of the type bars. Further jump. on many machines when adding up the Type carrier upwards, which leads to undesirable additional stresses on the machine leads.

Facilities for. Interception of the rebound effect of the racks or Tooth segments and also to prevent the type carrier from popping open when adding up are known. But they have the disadvantage that they consist of completely separate blocking and controls exist and are therefore costly to manufacture.

The trained according to the invention device for preventing the The rebound movement of the type carrier and the drive elements is characterized by that each drive member is effective with two in opposite directions of movement future ratchets are provided, the tooth pitch of the number unit of the number rollers corresponds and with which a pawl works together, that of the machine drive when moving forward with one of them and with the other in the case of decline Toothing of the locking mechanism is brought into engagement.

Such an embodiment of the subject matter of the invention is shown in the drawing shown schematically, in a longitudinal section through the Machine, of which only the parts necessary for an understanding of the invention are shown are.

The drawing shows a bracket 3 with a leaf spring fixed thereon 4. At the beginning of an operation, this bracket is replaced by one that is not shown here Control unit pivoted counterclockwise around pivot point 2, creating a pawl i placed in the dashed line position i 'and the locking effect on the rack 30 is canceled with slide 7. By a second drive element, not shown a shaft 5 is moved in the direction of arrow A.

The rack 30 with the slide 7 now moves under the influence of a tension spring 6 until its left-hand extension 3o 'reaches a stop 13, which is pressed into position 13' by the keyboard, not shown, when a value is keyed in. By means of an angle lever 8, which rotates around the axis io and has the two driver pins ii and 12, the type rod 9 is raised accordingly, and the printing unit (not shown) prints the corresponding value. Are high values keyed in, e.g. B. 7, 8 and 9, the rack 30 with a strong impact on the stop strikes 13 (Position 137. Since the whole system is driven by spring force, a spring-back and vibration is carried out of the rack 30 and the thereto by the lever 8- connected type bar 9, which would result in a faulty print. Now, however, when the rack 3o moves forward, the pawl i engages in a corresponding tooth gap 17 of the rack 3o. The path from one tooth gap to the other corresponds exactly to the value of a unit of numbers i is engaged with the rack 30 under the pressure of the spring 4 during the forward movement of the rack 30, the rack 30 and thus the entire system is locked. The above-described rebound and vibration cannot occur Paper strips ig are therefore clear and precise.

When balancing, the path of the rack 30 is not determined by the stop 13, but by adding wheels 14 with stop cams 15. The adding wheels 14 are mounted pivotably about the axis 16 on a carrier (not shown). When balancing, the adding wheels 14 are pivoted with their cams 15 against a rack 20. The axis 5 is driven forward by the mechanism already mentioned. Under the influence of the tension spring 6, now the entire mechanism is moved forward until the Addierrad 14 with cams 1 and 5 abuts against a tooth of the rod 20 comes to a standstill. The result is then written on the paper strip i9 by the printing mechanism (not shown).

When the: machine declines, the control unit switches pawl i back to position i. The adder is now pivoted again about the axis 16 and disengaged from the rack 2o. At this moment the shaft 5 is at point 5 '. The tension spring 6 would now pull the slide 7 and thus the entire system connected to the latter forward or upward. However, this cannot occur because the pawl i in its current position prevents the system from jumping forward. The drive mechanism returns the shaft 5 to its original position, thereby tensioning the spring 6 again and preparing it for a new operation.

The pawl i with its control elements is thus in the event of an impact the rack 3o prevents the same from rebounding and vibrating. In addition, will by reversing when adding up, the type carrier cannot open. The execution of these two important functions through the same locking and Control organs has made a significant simplification in the manufacture and assembly of the Machine result.

Claims (1)

PATENT CLAIM: Device on adding or accounting machines with drive racks or sectors adjustable by springs, with which type carriers are coupled. are to prevent the rebound movement of the type carrier and the drive elements, characterized in that each drive element (7, 30) is effective with two in opposite directions of movement. is provided, whose tooth pitch corresponds to the numerical unit of the number rollers and with which a pawl (i) cooperates, which is brought into engagement by the machine drive with one toothing of the locking mechanism when moving forward and with the other when moving back.