DE389243C - Switching mechanism for typewriters - Google Patents

Description

Switchgear for typewriters. The invention relates to a Switching mechanism for typewriters, in which the switching from type to type during the back and forth movement of the type lever takes place, and which for this purpose a split ratchet wheel is provided, which is connected to a common Switch blade is in communication.

The invention consists in that the abutting end edges the teeth of the ratchet halves are beveled in opposite directions, and that the switch blade effecting the switching process is also a correspondingly beveled one Tip, so that the change from one ratchet wheel to the other by sliding the Knife on the teeth.

This facility was made to hit when changing gearshifts the knife on the teeth of the ratchet wheels to prevent Bern and thereby to achieve almost noiseless switching.

In the drawing, an embodiment of the invention is through eight different images are shown.

Fig. I shows a side view of the rear derailleur in part Cut.

Abh. 2 shows a front view of the rear derailleur in part Cut.

Figures 3 to 8 show on an enlarged scale the positions, «-elche Knife and teeth of the ratchet wheels occupy each other during a forward and a backward movement of the type lever.

From the carrier a, the shaft c is held by points b. On this sits a gear d, which engages in a rack e. A gearwheel, which sits on a spring box g, engages in the rack e. On the shaft c, the ratchet wheel half is arranged so that it can rotate in four directions. Furthermore, the ratchet wheel half i is located on the shaft c and is fastened to the shaft by the screw k. The ratchet wheel halves lt and i are connected by the claws hl and il. The claws interlock with clearance. I between the Schaltradhälften and a spring in lt turned on. One end ml is attached to the ratchet half h and its other end m- 'to the ratchet half i. The switch knife n is inserted into the rocker arm o, which is rotatable in the tips 1), it swings around the pin u1 and is also pressed against the teeth by the spring-loaded bolt n =. The deflection of the switch blade against the teeth of the ratchet wheel halves is limited by the stop d #. The rocker o is connected to the switching bridge, not shown, for example by linkage cl. The spring r is still placed on the rocker arm o, "which causes the shoe o to assume the position shown in the drawing (Fig. I). The screw s is an adjusting screw for the swing arm.

In Figures 3 to 8, sections of the ratchet wheel halves i and lc are shown enlarged. ', First scale.

The position according to Fig.; take the ratchet wheel halves lt and i during the idle position of the type lever. The switch blade g is in this case, for example, on the tooth x of the ratchet half i.

During the movement of a type lever towards the roller, the knife n slides over tooth x (Fig. 4.) onto tooth y of the ratchet half left (Fig. 5). After the knife tt slides off the tooth x , the ratchet wheel half i is rotated by the spring inserted between the ratchet wheel halves in the direction of the arrow against the ratchet wheel half h so that the tooth x moves from the position shown in dotted lines to the position shown in full lines. After this, while the type lever is moving backwards from the roller to the rest position, the knife tt can transfer from tooth y of the ratchet half / t to tooth x1 of the ratchet half i (Fig. 6).

Approximately on the first half of the way of the backward movement of the type lever, the knife n assumes the position shown in Fig.; is shown. During the backward movement of the type lever on the second half of the - \ 'G% eges, the knife n slides from your tooth y of the ratchet half to the tooth x1 of the ratchet half i (Fig. 8).

The spring m inserted between the ratchet wheel halves turns the ratchet wheel half lt so far in the direction of the arrow after the knife tt has slid off the tooth y that the tooth y moves from the position shown in dash-dotted lines to the position shown in full lines.

The described process is repeated with each upward and backward movement of the type lever.

The switching movement is caused by the g in the spring housing located coil spring mediated by the gear f of the rack e and des Gear d.

Claims (1)

PATLNT CLAIM: Switching mechanism for typewriters, in which the Switching from type to type as the type lever moves backwards and forwards takes place, and in which two ratchet wheels that share a common switch blade are in connection, are provided, characterized in that the abutting Front edges of the teeth of the ratchet wheel halves beveled in the opposite direction are, and that the switch knife has a correspondingly beveled tip, so that the change from one ratchet wheel to another by sliding the knife on the teeth he follows.