DE55965C - Drive device for mechanical musical works - Google Patents

Description

IMPERIAL

PATENT OFFICE.

In the drawing intended to explain the invention, the mainspring a, FIGS. 1 and 3, is enclosed in a barrel b which is firmly connected to the gear c serving for further transmission of the drive movement. A treadmill d ² d ^a acting on the crankshaft d with the flywheel d ¹ occurs as a winding machine (FIGS. 1 and 2).

The spring α is fastened with its one end (at α ¹ ) on the shaft e rotatably mounted at e ¹ e ¹ , with its other end (at a ² ) on the barrel b. This latter, thus also the wheel c, sits loosely on the shaft e, as does the arm //, which is set in swinging motion around e by means of the connecting rod f ¹ and crank / ^2; on the other hand, the Keilnuthenrad g is firmly connected to the shaft e. The arm f carries a wedge-shaped pawl g ¹ which can be rotated about f ^B , which, when the arm moves upwards, inactively grinds in the groove of the wheel g and at the upper end of the stroke with its front, wedge-shaped sharpened tip g ^{s runs} under a roller k and thus out of the Nuth of the wheel g lifts, at. Downward gears, on the other hand, inserting into the wedge groove of g and wedging it, takes this wheel g with it in the direction of the arrow (FIG. 2) and thus has a tensing effect on the mainspring.

A counter pawl g ² prevents any retraction of g.

If the speed of tensioning is greater than that of the unwinding of the spring, it would soon become over-tensioned. In such a case, the pawl g ^{1 is} automatically released for a certain time, so that, although it continues to swing back and forth with the arm f , it does not give the wheel g any further motive power as long as the spring tension is below one has sunk to a certain extent.

A latch release device which satisfies these conditions can be provided as follows be:

Fig one arranges on the barrel b always a fitting piece of Triebfederwindung h ^1,. 1, an, therefore superimposed z. B. on the wheel c at h that piece h ¹ carrying lever, which protrudes through a slot at h °, Fig. 2 and 4, into the interior of the barrel and is able to lay with h ¹ against an edge of the spring α. A second lever h ² , which is mounted in the vicinity of h and which freely embraces shaft e with its lower forked end, rests against the previous lever W with a pressure dependent on the strength of a spring i.

The drawing shows the mainspring a in an almost expired state; if overstretched, it assumes the position shown in broken lines (Fig. 3), ie it is drawn together so that the upper curve moves approximately from a ³ to a ⁱ . Here, the piece h ¹ sinks back into the dashed position (FIG. 1), supported by the spring pressure i on the lever h ^2. As a result, lever h ^{2 also} moves to another, namely the

Dotted position, where he prefst a rail that freely encompasses the shaft e with a long hole / with the pressure of the spring i firmly against the hub of the wheel, g . The rail Z shown in particular in FIG. 7 is bolted at I ¹ to the pawl piece g ^l , and thus takes part in its movements. If it is now h at over-stressed spring a through the lower fork-like end of the lever ² g against the hub of the wheel, as mentioned above, hot pressed, thus causing the thereby raised friction, that the pawl g ^l, once excavated k by roller, also remains excavated during reverse gear, therefore the Keilnuthenrad g is not able to drively influence. Only after the mainspring α has run down to a certain extent and thus the lever h ¹ h ^{2 has moved} back so far that the lower end of I no longer jams does the pawl g ^{l act} again to drive the wheel g, ie tension on the mainspring.

5 and 6 illustrate the drive mechanism, for example, in application to a rotary piano, such as that under No. 41036 is patented by us. The thumb roller that mediates the keystroke occurs at m , the notation template at n. It now becomes clear how the regular rotation of wheel c achieved according to the device described above is transferred to the thumb roller m by a countershaft 0 with ^{the help of wheel c 1} and bevel gears ρ and through bevel gears q, shaft r and, if required, another intermediate gear on one wheel s of a friction gear train that takes the edge of the note template between them. At t a wind turbine wheel u may be operated to ensure the greatest possible uniformity of movement.

The advantages of the explained drive mechanism emerge as soon as it is considered how to achieve it the same effect when using an ordinary clockwork or weight elevator very large spring housings with strong, expensive springs, or large weights with composite springs Gear transmission and substantial drop spaces for those would be required; and while doing this still the Duration of movement is limited by the need for a spring or elevator of weight within certain periods of time, such limitation is found in the present Drive does not take place, in that the mentioned pulling up constantly (e.g. by the foot steps) happens without the uniform driving force of the spring or weight in its effect is interrupted.

Claims (2)

Patent claims: ι. A drive mechanism, in which between a small power machine (d ^B d ² d) and the wheel (c) propagating the drive movement, a spring (a) or an elevator weight is switched on or in such a way. with the shaft (e) of a ratchet device (gg ¹ ) and with the wheel c is connected to act as a voltage regulator BEZW. Contribute to the achievement of a steady gear even with uneven work of the engine. to be able to, whereby each overstressing of the spring or overcoming of the weight prevents a release device, which triggers the winding mechanism in this case, but in time before the expired spring or weight allows it to be activated again. 2. A triggering device for the drive mechanism identified under 1., consisting of a lever (h ² ) leaning against a piece (W) always resting on the mainspring (a ), which clamps a rail when the latter retracts a spring (c) (I) with the effect of disengaging the pawl (g ¹ ) from the wheel (g) that indirectly winds the mainspring. For this purpose ι sheet of drawings.