DE272132C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- M 272 132 CLASS ^ 5g. GROUP

in SCHÖNAU-CHEMNITZ.

The invention relates to a switching device for the paper trolley of typewriters and in particular such a shifting device with a gear shift and a pawl cooperating with the shifting wheel is working. In switching devices of this type, one can generally oscillate mounted switch lock is provided, which has a loose and a fixed gear tooth.

ίο If type lever shift (so-called shoulder shift) is used, the switch lock learns through the intermediary of the switching bridge only a relatively small oscillating movement, while it is particularly desirable in the interests of rapid switching the loosely engaged, usually almost full width, with the ratchet wheel Shift tooth performs a relatively large movement in a short time. To the above To take into account the circumstances set out, according to the invention, the loose gear tooth an additional movement can be given, that of the oscillating movement of the entire switching mechanism rushes. This leading additional movement is expediently given to the loose switching tooth by the fact that it or its supporting body with a lever-like extension right at the beginning of the oscillating movement of the key switch hits against an adjustable stop.

The object of the invention is shown in the drawing in an exemplary embodiment, namely shows:

Fig. Ι a view from the front of the switching device,

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Fig. 2 is a corresponding view from the side with the loose gear tooth in engagement,

3 shows the same view with the fixed switching tooth in engagement,

4 shows a schematic representation.

The ratchet wheel 1 works in a known manner with the fixed or loose pawl 2 or 3 arranged on the switch lock body 4. The entire switch lock body 4 is expediently mounted so as to swing on balls $ ^a with adjustable studs 6 in the switchgear bracket 5. The padlock body 4 has bent tabs 7 in which adjustable studs 8 are arranged, between which the support body 9, which carries the loose switching tooth 3, can move in an oscillating manner. The latter is pivotably mounted around a pin 10 located on the support body 9 and is ^{tightened by a helical spring 13 tensioned between the pin 12 on the loose gear tooth 3 and the pin 12 a} on the lock body 4, which tends to move the loose gear tooth 3 according to FIG Turning clockwise direction affects. In addition, however, the spring 13 seeks to rotate the loose switching tooth 3 and with this the support body 9 according to FIG. 2 to the left about the oscillation axis 8-8. These movements are limited on the one hand by an upwardly directed stop arm 19 that can swing around the pin 20 and is under the action of the spring 21, and on the other hand by a downward movement on the support body 9

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Claims (3)

extending extension 15 which rests against an adjusting screw 16 mounted on the switchgear bracket 5. The mode of operation of the subject matter of the invention is as follows: If the switch lock is swung to the right in a known manner by striking a type lever with the intermediation of the switching bridge from its normal position according to FIGS 4 attached fixed shift tooth 2 according to FIG. 3 in the ratchet wheel ι, while the loose shift tooth 3 emerges from the teeth of the ratchet wheel and can swing around the pin 10 to perform its switching movement. When the switching mechanism oscillates, the loose switching tooth 3 receives an additional movement which leads the oscillating movement of the switching mechanism in that the extension 15 comes to rest against the adjusting screw 16 immediately after the switching mechanism begins to oscillate. The start of the additional movement depends on how far the stop on the adjusting screw 16 is from the extension 15 in its normal position, while the size of the additional movement is determined by the ratio between the distances between the adjusting screw 16 and the pivot axis 5a-5a of the switching mechanism from the swing axis 8-8 of the support body 9 or by the ratio between the distance of the adjusting screw 16 from the swing axis of the support body 9 and the length of the loose switching tooth 3. Accordingly, the start of the additional movement can be determined by adjusting the adjusting screw 16 in the direction of its longitudinal axis and the size of the additional movement can be regulated by raising or lowering the adjusting screw. This raising or lowering of the set screw can be done by any known means, e.g. B. in that the screw is guided in a stone which is adjustable in a slot in the switchgear bracket 5. Godfather τ-An Proverbs: 1. Switching device for the paper trolley of typewriters, thereby characterized in that the loose switching tooth right at the beginning of the oscillating movement of the Switching lock with the mediation of an adjustable stop an additional movement receives, which leads the oscillating movement of the switch lock, for the purpose, with only a small oscillation of the Switching lock to increase the speed of the circuit. 2. Switching device according to claim 1, characterized in that the switchgear bracket (4) supporting body (9) of the loose switching tooth (3) with an arm-like one, which is mounted oscillating in the same direction with this Extension (15) at the beginning of the oscillating movement of the switch lock against one Stop (16) hits, which is used to determine the start of the additional movement of the loose gear tooth (3) in the direction of its longitudinal axis and to regulate the size of the additional movement vertically is adjustable to this direction. 1 sheet of drawings.