DE2045638B2 - DEVICE FOR CONTROLLING A STEPPING LOCK BY A TAB ON OFFICE MACHINERY - Google Patents

Description

This ensures that the stepping pawl completely unhindered by the knife lever carrier or the knife lever itself into the teeth of the Switching body can fall. The Eini'allbewegung the stepping pawl in the switch body and the The return of the knife lever carrier to its rest position is therefore carried out separately and one after the other.

The drawings contain an embodiment of the device according to the invention. It shows

F i g. 1 the device according to the invention in a front view with the adhesive tab in place,

F i g. 2 shows the device according to the invention in a side view with a position as in FIG. 1 with schematically presented starting position,

F i g. 3 a schematic representation of the device according to the invention.

In the F i g. 1 and 2, a circular tab rail 1 is shown, which with individual provided by an actuator 2 in the range of action of a knife lever 3 displaceable stop pins 4 is. The knife lever 3 is arranged in a knife lever carrier 5, which is fixed on a frame Axis 6 is longitudinally displaceable and pivotable to the side. On an arm 7 of the knife lever carrier 5 a tension spring 8 is attached, which it constantly counter to the tabulation of the tab rail i - and influenced in the counterclockwise direction as seen from FIG. 2. The knife lever carrier 5 has a locking arm 9 which has a latching recess 10 at its free end. The locking recess 10 and the lower edge 11 of the locking arm 9 work with the locking lug 12 of a locking lever 13 together, which is on a frame-fixed bolt 14 against the action of a spring 15 by a with a tension member 16 connected to a tab key (not shown) into the position shown in FIG. 2 position shown pivotable is stored. Opposite the locking arm 9, the knife lever carrier 5 has a second one Arm 17 up. which protrudes into the range of motion of a stepping pawl 18. The stepping pawl 18 is provided with a functional surface 19 which interacts with the second arm 17 of the knife lever carrier 5, and furthermore has a clearance 20, which is adjacent to the functional surface 19, for the same arm 17 on. The functional surface 19 of the stepping pawl 18 is with respect to the by Stop pins 4 of the tab rail 1 predetermined displacement movement formed much shorter than the locking lug 12 of the locking lever 13. The stepping pawl 18 can be pivoted on a lever 21 lurked and cooperates with the teeth 22 of a switching body 23 that determines the step division, which is arranged coaxially to the tab rail 1.

In Fig. 2 is the rest position of the inventive Facility shown in dash-dotted lines. When you press the tab key, not shown, over the tension member 16 of the locking lever 13 is pivoted counterclockwise against the action of the spring 15. The locking lug 12 slides along the lower edge 11 of the locking arm 9, pivoted the knife lever carrier 5 clockwise and reaches the locking recess 10 of the locking arm 9, whereby the locking lever 13 and the knife lever carrier 5 are locked in the pivoted positions will. The pivoting of the knife lever carrier 5 causes the knife lever 3 to move into the range of motion the stop pins 4 of the tab rail 1. At the same time, the second arm 17 of the knife lever 5, the stepping pawl 18 via its functional surface 19 from the toothing 22 of the Switching element 23 pulled. This unlocks the office machine trolley and rotates when it is carried out the tabulation movement the switch body 23 and the tab rail 1 clockwise. The first set stop pin 4 hits the knife lever 3 and moves the knife lever carrier 5 in the same direction. The arm 17 of the knife lever carrier 5 slides over the functional surface 19 of the Stepping pawl 18 and arrives in the area of free processing 20. The stepping pawl 18. die by the action of a spring 24 with its functional surface 19 on the second arm 17 of the knife lever 5, is now released and can freely fall into the teeth of the switching body 23. In the meantime the knife lever carrier 5 remains via the locking recess 10 through the locking lug 12 of the locking lever 13 continues to be blocked until it is activated by the action of the relevant stop pin 4 is pushed out with its locking member 9 over the end of the locking lug 12. The locking lever 13 can then return clockwise to its rest position. The knife lever carrier 5 slides counterclockwise with the knife lever 3 from the stop pin 4 and returns by the action of its Tension spring 8 back to the starting position.

Because the locking lug 12 of the locking lever 13 and the functional surface 19 of the stepping pawl 18 protrude differently far into the range of motion of the knife lever carrier 5 (see Fig. 3), is the safe one Chronological sequence of the sequence of the functions »release of the stepping pawl« and »release of the knife lever carrier« guaranteed.

1 sheet of drawings

COPY

Claims (2)

Patent claims: 1. Device for controlling a stepping pawl by means of a tab, in particular an adhesive tab, on typewriters or similar office machines with one that can be actuated by a tab key and with a stepping pawl for a switching body containing the step division devices (see e.g. USA.-Patent 2 805 749) functional elements provided with are connected to a knife lever and are constantly in operative connection with the stepping pawls. When the knife lever is moved into the movement area of the stop pins on the tab rail the stepping pawls - as already mentioned - are replaced by the ones provided for this purpose Functional elements lifted out of the switch body connected and pivotably mounted knife-io and held in this state until the lever carrier, which can be brought into engagement with stop pins of a tabulator knife lever by the action of the stop pins in the rail, by means of a detent
lockable in its effective action and by the Stop pins can be released again, thereby g e - can return to its original position. The step-by-step ratchets, which are constantly under spring force, follow this return movement of the functional elements of the indicates that the knife lever carrier 15 knife lever and thus get back into the tooth (5) one at its free end with a detent on the switch body, whereby the tabulating device recess (10) provided locking arm (9) for a locking lever connected to the tab key (13) and a second arm (17), aisle for the office machine trolley is ended. Devices of this type for stepping pawl control using tabs have proven themselves in the one with the stepping pawl (18) over a 20 machine that works at normal speeds (19), which are shorter than the locking lug, have proven themselves in themselves. In more recent times, however, will (12) of the locking lever (13) is, for example, typewriters or printing units has the effect that the indexing pawl (18) is already terminated at significantly higher operating speeds the unlocking movement of the measuring device, which is very high with the tabulating devices lever carrier (5) to fall into the switching 25 Requirements for the accuracy of the work table body (23) is released. fe the functional parts controlling the column jumps 2. Apparatus according to claim 1, characterized thereby. It has now been found that so far indicates that the stepping pawl (18) has become known devices at high Areine Free work (20) for the second arm (17) working speeds are not trouble-free enough ardes Has knife lever carrier (5), which beiten in 30. As is well known, the step-by-step ratchets must its unlocking direction to the function to terminate a tabulation process in the tooth surface (19) follows. voltages of the switch body fall, and still during their full tabulation speed, so do the office machine trolleys in the selected columns 35 stop. Tests have shown that at fast executed tabulating movements, the stepping pawls are not timed precisely enough into the switching body come up, whereby it happens that the office The invention relates to a device for control carriages to be stopped in a column, which Ren a stepping pawl by a tab, 40 behind or in front of the desired one. This arises in particular adhesive tab, on typewriters or similar office machines with a tab key operable and with a stepping pawl for a switching body containing the step division in that the indexing pawls with the knife levers or with the knife lever carriers on the Functional elements are constantly in operative connection with one another, which means that the engagement by means of connected and pivotably mounted knife movement of the stepping pawls in the toothing lever carrier, which can be brought into engagement with stop pins of a tabulator, the switching body from the speed of the rear rail, by means of a detent in
its effective position can be locked and by the stop pins can be released again. falling movement of the knife lever carrier in the starting position is dependent. The stepping pawls can It is generally known that in the case of tabulating devices 50 switch bodies occur, as do the masses and the the knife lever itself or the knife lever bearing friction of the knife lever carrier with the knife sluggish - after allowing them to move into the range of motion of the stop pins of the tab levers and the functional elements by means of a trigger pulse generator (tab keys or remotely controllable magnets).
The present invention now has the task a device for controlling a step switch rails were brought - in a latched position 55 by a tab to create the position in which it then avoids the disadvantages listed above regardless of the above and activated state of the trigger pulse generator for so long
remain until one of the set stop pins pushes them out of the locking position again and thereby to Return to the starting position releases. This tabular 60 free end is provided with a locking recess gates, which are generally referred to as adhesive tabs, locking arm for one with the tab key, work together with indexing devices in such a way that when they are operated, the indexing pawls from those containing the step division ensures a simple structure and safe operation; their solution is characterized by that the knife lever carrier one at his NEN locking lever and a second arm, which with the stepping pawl over a functional surface, which is shorter than the locking lug of the locking lever, Switch bodies lifted - and thus the taboo 65 interacts in such a way that the stepping pawl office machine trolleys are released before the unlocking movement is completed the. of the knife lever carrier to fall into the switching For this purpose, one of these tab bodies is released.