DE1814589U - NEGATOR SPRING, IN PARTICULAR FOR CINEMA CAMERAS. - Google Patents

Description

Negator spring mechanism, especially for cinema cameras

Legatorfedern are ribbon springs which, when relaxed, form a coil, i.e. each spring element has the same curvature as all the others when it is cut out, or the curvature is dimensioned proportionally to the respective radius of the relaxed coil. The spring is tensioned by it is wound from a small spring core, on which it is rolled up, onto a spring core with a larger diameter, advantageously against the ^: winding direction.After the release of this larger winding core, the spring rewinds itself back onto the smaller one, with both winding cores A substantially constant torque is exerted, which makes the spring particularly suitable for driving cinema cameras.

Special edge limiting devices must be provided so that the two coils cannot migrate out in the axial direction will. As a rule, disks are used for this, which are laterally of the winding cores on the common axis, in particular rotatable are arranged. However, it is often necessary to control special display or switching processes or drive via the winding core or to allow the output to attack the winding core from the side, so that edge disks are not attached at the point in question can be. In principle, it is possible to provide device-proof support strips. From this side you can then - e.g. via pawls - for an elevator and flow limitation attack the winding core. Due to the friction: on the bar, however, the spring mechanism is braked. Most importantly, the groin surface will be Badly damaged by the spring leaf edges.

HK 378 ^;

According to the innovation, it is proposed that at least one Randbegreja? wetting with a rotatably mounted Solle-transferred These EoELe 'can be directly on the spring blade edges abut _e your GescÜSwindigkeit is determined by the speed of the reel in the middle · area "It can therefore only differences in speed between the respective middle and the associated outer or ₀ inner spring layers impact »Compared to a support bar, the friction can usually be reduced to less than 20 fo .

The role is expediently at a distance from the associated winding core arranged. This can happen once by one the winding core or * its front edge in the axial direction behind takes back the spring leaf edges or the inwardly directed roll edge by about a fraction of the spring leaf thickness outside moves.

A further reduction in friction is achieved ₉ that a plurality of edge delimiting rollers are rotatably mounted on an axis running radially to the pivot axis. Compared to the first-mentioned embodiment, the friction is further reduced by a factor that is equal to the number of individual rollers. If, moreover, the rollers are also arched in the shape of a barrel, point contact is practically achieved. A friction inhibiting the spring can no longer be perceived, and the roller surface is hardly subject to wear any more »

The drawing shows the wage, for example. Show it

Fig. 1 is a diagrammatic representation of an alloy spring mechanism for a cinema camera,

2 shows a section through this spring mechanism along the cutting line H-II and

3 shows an enlarged representation corresponding to FIG. 2 with a modified support roller arrangement,

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In the warts 1a and 1b of the housing wall 1 one further not ^ ■ '.; cinema camera shown, two bearing axles 2, 3 are firmly riveted ο Furthermore, in the ring grooves 2a and 3a of the two bearing ■ Axles snap ring 4> 5 let in. On a shaft part 2b of the Bearing axis 2 sit between the snap ring.4 and an end face 6 of the nipple 1a each rotatable for itself is a first winding core 7 and an edge delimiting disk 8. In the same way on a shaft part 3b of the axis 3 between an end face 9 of the lug 1b and the snap ring 5, a second winding core .10 and an edge limiting disk 12 rotatably mounted for itself. 11 is a gear of the camera gear that is fixedly connected to the winding core 10 or via a ratchet lock.

This winding core can be used in a known and therefore not shown manner with an elevator key or with an elevator crank be connected. In principle, it is also possible to rotatably mount one or both axes 2, 3 in the housing, with the winding core to be firmly connected and to the associated gear parts couple.

A Legätorfeder 13 is connected with its inner end to the winding core and with its outer end to the winding core 10. After the drawn representation of the spring by rotation of the winding core 10 urged clockwise in accordance with FIG _o 1 and contrary to their original sense of curvature on the core TO coiled into a coil 21. As soon as then the winding core 10 releases it again, the spring winds onto the core 7 back> The torque exerted on the winding cores 7 and 10 can be used to drive the cinema engine. From the housing side 7 elevator and run-off limiting devices can act on the winding core. ·

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. MK 378

However, everyone on this page also opposes ^ Emigration is secured, a roller 14 "is provided, the axis of which runs radially to the axis 2 and which can be rotated in one of the

Housing wall 1 attached bracket 15 is mounted. The role can be can be attached to any point on the circumference of the wrap «you therefore takes up practically no space, but considerably reduces the friction at the support point.

A further reduction in friction is obtained with the arrangement According to Figo3 »Instead of the roller 14 in the bracket 15 there is an axis 16 held. In principle, the axis can be firmly connected to the bracket be. However, it is much better if they can also be rotated is stored. On this axis 16 sit next to each other three barrel-shaped Rollers 17, which rest only on one or on adjacent spring turns of a coil 20 and are independent of one another can turn. The space requirement has not changed and the effort is negligible.

In order to avoid friction between the roller 14 respectively _o the rollers 17 of the winding core 7 occurs, as can best be seen from Figo3, the end face "retreated in the axial direction behind the voltage applied to the rollers 17 end face 19 of the roll 18, in an analogous In this way, the inner edge of the roller 14 or the inner roller 17 can also be moved outward in the radial direction over the outer circumference of the winding core 7. ■

Claims (4)

P.A. 667 595-7.11.59 - 5 MK 378 protection claims 1. Hegator spring system, especially for cinema cameras, with edge borders, which prevent lateral migration of the spring coil, characterized in that at least one edge delimitation has a rotatably mounted sleeve (14, 17) resting on the end face of a roll. 2. Uegator spring mechanism according to claim 1, characterized in that that the roll is at a distance from the associated winding core (7) is arranged * 3. Negator spring mechanism according to claim 1 or 2, characterized in that • that on an axis running radially to the winding axis (2) (16) several edge delimitation rollers (17) are rotatably mounted. 4. alloy spring mechanism according to claim 3, characterized in that the rollers (17) are arched barrel-shaped. 1 sheet of drawings