DE7917405U1 - Device for the travel-dependent shutdown of electromotive actuators - Google Patents

Description

Berlin and Munich VPA 79 P 3 5? 3 FRG

Device for the travel-dependent shutdown of electromotive actuators

The invention relates to a device for the travel-dependent disconnection of electromotive Actuators each with a multi-stage counter roller switching mechanism for each direction of rotation and with an electrical switch operated by its last stage as well as with means for setting the switching points corresponding to the end positions of the travel range.

In known devices of this type are parallel to a drive shaft connected to the actuator the switching gears and switching pinion supporting shafts of two roller counter switching mechanisms arranged, the Operate the switch with the aid of the cam disks.

During operation, the counter roller switching mechanisms assigned to the two directions of rotation are removed from the drive shaft driven. To set the adjustment points, the actuator is moved to the respective end position and

Sp 4 Bz / June 15, 1979

SIEMENS AKTIENGESELLSCHAFT Our reference f

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stopped there, the drive shaft of the roller switchgear is disengaged and these are turned by hand until the cam disk is assigned to each switchgear Switch operated.

The known travel-dependent switching devices have a relatively complex structure.

There is therefore the task of simplifying the structure while maintaining the essential structural features.

A solution to the problem is seen in a device of the type mentioned at the outset, which is characterized by is that the ratchet wheels of both switching mechanisms on the outer sections of a motor driven WeI-Ie are arranged freely rotatable and that on the central portion of the shaft is a fixedly connected drive gear and on both sides of this one connected to the first ratchet wheel of each switching mechanism Intermediate wheel is arranged freely rotatable and that parallel to the drive shaft one on its outer sections Adjustment shaft supporting the switching pinion of the roller switchgear is arranged so that it can be axially displaced and locked is, on the central portion of which three gears are firmly attached to each other at such a distance that in a middle position meshes the middle gear with the drive gear and the outer gears with the intermediate gears are engaged on the drive shaft and that in each case a different position on this side or beyond the central position ^ e one of the outer gears is in engagement with the respective intermediate gear of a roller switch gear.

In a preferred embodiment, the upper end of the adjusting shaft is rotatably mounted in a hopper that is axially adjustable by means of a thread and lockable by means of a detent in three positions, see above

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that by turning the sleeve the operating position and the the other two positions for setting the limit switch points are set, thus facilitating operability is.

Another advantage of the device designed according to the invention is to be seen in the fact that only two instead of the previous five shafts with their bearings are required and that a better use of space as a result of the ' smaller footprint of the path-dependent switching device is achieved.

To explain the invention, an exemplary embodiment is shown in FIGS. 1 to 4 and described below.
15th

Figure 1 shows in longitudinal section a travel-dependent switching device in the operating position,

FIG. 2 is a view from above of the adjustment device,

FIGS. 3 and 4 show the same switching device when setting an end position switching point.

Figure 1; Two shafts arranged parallel to one another, namely a drive shaft 3 and an adjusting shaft 4, are mounted in two plates 1 and 2.

The drive shaft 3 is in a manner not shown here by the electromotive actuator Actuator driven in one or the other direction of rotation. On the outer sections of the two shafts the elements of two multi-stage counter roller derailleurs 5 and 5 * are arranged to be freely rotatable, namely on the drive shaft 3 the ratchet wheels 6 and 6 ', on the setting shaft 4 with these in the manner of a Geneva cross gear coupled switching pinion 7 and 7 '.

• III

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The Mlttelabechnitt of the drive shaft 3 carries a drive gear 8 firmly connected to it, while with the adjacent switching gears 6 and 6 ^{1 of} the multi-stage roller switchgear 5 and 5 'intermediate gears 9 and 9' are coaxially connected and also freely rotatable on the drive shaft 3.

The adjusting shaft 4, which can be displaced and locked in the axial direction, is here in a central position corresponding to the operating position. In its central section, a group of three gears 10, 11 and 11 'firmly connected to one another and to the setting shaft 4 are arranged at such a distance from one another that the central gear 10 meshes with the drive gear 8 in the center position of the setting shaft 4 shown here , while the outer gears 11 and 11 'with the intermediate gears 9 and 9 ^{1 are} in engagement and thus drive the roller switchgear 5 and 5 ^1.

The progressive pinions 7 and 7 'from their last stage are provided with switching cams 12, 12 · which actuate electrical pushbutton switches 13 and 13 ', which act as limit switches Switch off the actuator when the travel end points are reached.

25th

In order to enable the adjusting shaft 4 to be shifted easily and precisely in the axial direction, its upper end can be rotated in a sleeve 14, but is mounted in an axially immovable manner. The sleeve 14 is provided with an external thread 15 with a large pitch, which cooperates with a corresponding internal thread in a connecting piece 16 in the plate 1. The sleeve 14 is also connected to a knurled adjusting washer 17 which, as can be seen in FIG .

in the «■■« «#

* Ulf « m ·

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disk 17 and sleeve 14 in the respective position
specifies.

For setting the switching point for an end position
of the travel is the form-fitting connection of the
Setting shaft 4 to be loosened with drive shaft 3 via gears 8 and 10. This is done by lifting the
Leaf spring 19 released the detent for adjusting disk 17,
this can be from the zero or operating position, see
Figure 2, are rotated until the leaf spring 19 in the
next of the incisions 18 snaps into place, for example

into the incision L (counterclockwise rotation of the actuator), %

see Figure 4. By turning the adjusting disk j *

17, the sleeve 14 screws down and takes the \

Adjustment shaft 4 with, as shown in FIG. The | axial stroke is calculated so that in position L the ji Adjusting disk 17, the middle gear 10 and the outer gear 11 on the setting shaft 4 with the drive gear 8 and the intermediate gear 9 on the drive -

shaft 3 comes out of engagement, the other external gear 11 'but with the intermediate gear 9 ¹ in engagement
remain. By means of a screw slot 20 on

The screwdriver inserted at the upper end of the setting shaft 4 can now be used to manually adjust the setting shaft 4 for as long. | ^;

until after the the path covered by the actuator% corresponding rotations of the roller switch gear 5 ¹ are rotated, the switch cam 12 'of the last switching \, ritzeis 7 ¹ the switch 13' is actuated. j

ι In a corresponding manner the adjusting% ■ by rotating disk, the adjusting shaft 4 is raised so 17 in the rest position R (clockwise rotation of the manipulated \ drives) that f combing her gear 11 with the intermediate gear 9, while the gears 10 and 6 or 11 * and 9 * are disengaged.

After setting the two end position switch points, the

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Adjustment shaft 4 is brought back into the zero or operating position, the roller ^{switchgear units 5 and 5 1} count in terms of rotation, depending on the direction of rotation, the distance covered by the actuator and switch off when the respective end positions are reached with the aid of the push button switch 13 or 13 ^T.

As can be seen in particular from FIGS. 2 and 4 , the switching devices shown can be constructed in a space-saving manner on a small footprint.

Summary VPA 79 P 3 5 2 3 BRO

Device for the travel-dependent shutdown of electromotive actuators

Device for the travel-dependent shutdown of electromotive actuators, each with a multi-stage Counter roller switching mechanism for each direction of rotation and with an electrical one operated by its last stage Switches as well as means for setting the switching points corresponding to the end positions of the travel range, the switching wheels of both switching mechanisms on the outer sections of one driven by the servomotor Shaft are arranged freely rotatable and on the central portion of the drive shaft a fixedly connected to it Drive gear and on both sides of this in each case a Dult connected to the first ratchet wheel of each switching mechanism Intermediate gear is arranged freely rotatable. Parallel to the drive shaft there is one on its outer sections Adjustment shaft bearing the indexing pinion of the roller switchgear arranged so that it can be axially displaced and locked, on the middle portion of which three gears are firmly attached to each other at such a distance that in a central position the middle gear meshes with the drive gear and the outer gears with the intermediate gears are engaged on the drive shaft and in a different position on either side of the central position each one of the outer gears with the respective intermediate gear of a roller switch gear in engagement is. (Figure 1)

Claims (2)

- 1 - VPA 79 P 3 5 2 3 BRD claims 1. Einrichtlang for the travel-dependent shutdown of electromotive actuators, each with a multi-stage counter roller switching mechanism for each direction of rotation and with an electrical switch operated by its last stage and with means for setting the switching points corresponding to the end positions of the travel, characterized in that the switching wheels (6 , 6 ^f ) both switching mechanisms (5, 5 ¹ ) are arranged freely rotatable on the outer sections of a shaft (3) driven by the servomotor and that on the central section of the drive shaft (3) a drive gear (8) firmly connected to it and on both sides of this one intermediate gear (9, 9 ') fre-i connected to the first switching gear: 1 of each switching gear is rotatably arranged and that parallel to the drive shaft (3) an ^{adjusting shaft (4) carrying the stepping pinions (7, 7 1} ) of the roller control mechanisms (5, 5 ') on its outer section is axially displaceable and lockable, and on the middle section of which three gear wheels (10 , 11, 11 ") are firmly attached at such a distance that in a central position the middle gear (10) meshes with the drive wheel (8) and the outer gears (11, 11 ') with the intermediate wheels (9, 9 ¹ ) are engaged on the drive shaft (3) and that in a different position on either side of the central position one of the outer gears (11, 11 ') is in engagement ^{with the respective intermediate gear (9, 9 1} ) of a roller switch ^{gear (5, 5 1).} 2. Device according to claim 1, characterized in that the adjusting shaft (4) with its upper end freely rotatable in an axially adjustable by means of external thread (15) and by means of a Ra- • ••• a · ■ · -z- VPA 79 P 3 5 2 3 BRD stung (18, 19) is mounted in three positions lockable sleeve (14). '■ ·· '· It I lllll · ■ • t «l I» %