DE90008C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The present invention relates in part to the arrangements of the patents No. 79420 and No. 79421 derived innovation on rack bar mechanisms or signal mechanisms, which amounts to the one protected by patent no. 79420, lifting the rake To make the pawl at the same time serving the purpose, according to patent no. 79421 by the arm of the hammer shaft, which restricts the movement of the gear train, is fulfilled. With the latter device (according to patent No. 79421) is the advantage now also used for the new device achieved that the key lever simultaneously with the hammer shaft, so simultaneously with the last note, falls back into the closing position. To serve as a key lever stop will the raking pawl is enabled simply by the fact that it is opened with its point or another Partly catches the key lever as soon as it has fulfilled its task as a pawl the rake becomes free for the final movement. In the simplest embodiment of the subject matter of the invention, the one acting on the rake can The ratchet tooth of the wrench lever itself must at the same time be the part of the rake lever is held back.

This embodiment is shown in FIGS. 1 to 5 the drawing is based on. '

While FIG. 4 is a basic outline of the device related to FIG. 3, FIGS. 1, 2 and 3 as well as the supplementary figure 5 represent different positions of the essential parts of the device for which, as may be noted from the start, the known aids are used Striking mechanism triggers
Edition

can also be used in an arrangement other than that indicated.

In the case of the triggering from the quarter tube pin% (Fig. 2), which is achieved here by the release lever h with a stop lug q locking the windscreen drive wheel c and by the locking lever f with the locking lug ρ , the rake r lowers to on the scale. Now the lifted locking lever f falls with its ratchet nose v, which previously fafste under the last rake tooth (Fig. I), against the rake toothing in order to prevent its decline after the release lever h falls from the pin 1 when the rake is gradually raised. The rake is lifted by the pawl α according to FIG. 5, which serves as a replacement for the usual creator and back and forth in the same direction as the hammer b (FIG. 4). oscillates in that the hammer shaft w itself is made to support the pawl a . The lever wheel y is indicated with dots in FIGS. 1, 2 and 3 and actuates the hammer shaft n> in the usual way by means of the hammer shaft pin x. In the rest position (Fig. Ι
train.

As with the usual rake lifting by a rotating scoop, each time (for each note) the rake is raised a little further beyond the corn of each step. the key lever nose ν arises. Accordingly, a distinction can be made between "tooth spacing increase" and "relapse lifting". The difference in the influence of tooth spacing

is the pawl α outside the rake

Claims (1)

Elevation and relapse upon the operation of the striking mechanism occurs most clearly in the Raising the rake at the end, d. H. at the last stroke. The position according to FIG. 3 corresponds to the point in time when the hammer, together with the pawl a, has already covered part of the last percussion oscillation. As soon as the last raising of the tooth spacing is finished, the closing lever, which had been in contact with the teeth up to that point, is immediately free in order to reach the final position prematurely, after which there must still be enough room to move on the gear train for the part lifting the rake to work Fallback lifting and onsere engagement position of the rake can be moved. It can be seen that this trailing movement of the gear train requires special assembly work on the part of the watchmaker that takes the gear train relationships into account and which is of considerable importance to avoid. According to the invention, this purpose is achieved by the fact that the pawl α presents itself during the relapse lifting and consequently also during the rake relapse itself at the point and at the point in time as a key lever stop opposite the nose ν , where the rake toothing ceases to prevent the key lever from falling . The pawl a is expediently designed at its tip in the form of a knife edge, which at times in preparation for the last pitch in preparation for the last pitch is presented in the same position as a replacement tooth to be thought below the last calculating tooth. If the pawl is then rotated further downwards during the course of the last oscillation of the hammer shaft, the nose ν of the key lever finally loses its grip on the pawl cutting edge, so that the key movement and the stopping of the gear train can take place substantially at the same time as the key stroke. In this way, the follow-up movement can be limited to a desired minimum. A constructively different design of the subject of the invention arises when the latch nose used to prevent the rake from falling back is arranged spatially separated from the locking nose on the locking lever. This embodiment is illustrated in one example by FIGS. 6 and 7 (side view and arithmetic end view). The pawl nose v ² is two tooth spacings higher than the nose v ^{1 of the} same wrench lever projection v, which cooperates with the pawl α. Corresponding to this device, the last two teeth of the rake (Fig. 7) are cranked out of the swing area of the locking lever projection ν in ^{such a way that the pawl nose v 2} under the third-last tooth could immediately fall in to bring about the locking, if the locking lever does not counter this movement with another For a long time due to the attack of the latch a on the nose y ¹ would be held. The pawl α takes care of the counting of the strokes and the gradual lifting of the rake, as before, in that the ratchet cutting edge is wide enough to engage both in the upper ratchet teeth of the rake r and in its cranked end teeth. At the final strike, the key lever hits the pawl α with v ^l and is held back until the last sound is emitted. It can be seen that the design just described is independent of the number of offset rake teeth and that any number of end teeth can be offset in order to create space for the incidence of the wrench lever. The cranked teeth can then only serve the lifting attack of the pawl α , while the latching lug v ' ^{2 of} the scblufshebels, which is correspondingly laid over the nose v ¹ , interacts in a locking manner with the uncranked upper rake teeth. Of course, more teeth must then be provided towards the upper end. In the special case where, for example, the bend is limited to less than one tooth, the noses v ¹ and v ^{2 of} the wrench lever can be combined in a projection of the same. Another arrangement of the device described, which does not change the effect would consist in having an independent pawl in addition to the key lever attaches, whereby the key lever would only have to stop the gear train. Patent claim: Percussion or signal mechanism with one moved by the percussion hammer or the hammer shaft Rake lifting pawl (according to patent no. 79420), characterized in that the pawl to it is used to intercept the key lever on the last stroke in order to keep the gear train moving in the manner indicated in Patent No. 79421. 1 sheet of drawings.