DE761176C - Switching device consisting of a ring-shaped potentiometer - Google Patents

Description

Switching device consisting of a ring-shaped potentiometer The invention relates to one consisting of an annular potentiometer Switching device, especially in connection with a counter motor, in which the potentiometer is divided into a winding ring and a metal ring, the are each provided with a slider whose drive is through the same encoder, but is done at different speeds.

Potentiometer switching devices are used to control that of any To convert position values supplied to encoders into electrical values, which are then very -Easily directed to anywhere for display or control purposes can be. It has been shown that this leads to proper control continuous only in a small angle of rotation range around the zero position of the potentiometer Values are required, while it is sufficient for all other potentiometer settings to get a constant control value. One has therefore switched to the potentiometer only over a small area to form the zero position as a winding, to have all other parts formed by metal segments. All- (litigs it is necessary with this training, the winding part carefully from one to produce very fine wire in order to achieve the necessary precision in the control zti achieve. which naturally causes considerable difficulties in production.

Therefore, one is to the division described at the beginning: Potentiometer: come in a t @ icl; ling and metal ring. thereby avoiding these difficulties will. However, the switchover that becomes necessary at certain "times" must be carried out here of the potentiometer output from the metal ring to the winding ring and vice versa from one Relay arrangement are carried out, which, as is known, requires considerable effort and is very easily exposed to interference. Geinäl ', the invention will only be. these - This avoids disadvantages. represent the metal ring in two opposite places is interrupted by inserted metal segments. who isolated against him and with are conductively connected to the wiper of the winding ring.

Fig. I shows schematically the structure of a potentiometer divided in this way. Here i is the winding ring and a is its slider. while with 3 the lletaliring and whose @clileifer is denoted by -. The metal ring is on two opposite one another Places interrupted by metal segments 3 and 6 isolated. the one with the grinder z are conductively connected. Both rings are parallel to a common Spanriungsqtielle, at the connection points of the winding ring i several @; - indungen by soldering ; and are short-circuited. The control voltage is taken from the island mines 9 and 10.

When this potentiometer is working, the wiper 2 runs around a whole Many times faster than the grinder. what by a connected between the two Transmission is achieved. As long as the grinder is 4. somewhere on the 'metal ring 3 slides, the winding ring i is still switched off, and those at 9 and io are general Control values are constant and determined by the resistance value of the metal ring; given. However, if the grinder .I. on one of the segments 3 or 6. a Switching to the winding ring i on. and the potentiometer now delivers steady Values. If, for example, the grinder .1 has moved from the position shown, uni iSo @ moved to segment 6. so the grinder = i11 must also be shifted by iSo = Position and not again in the position drawn. otherwise a polarity reversal the tax values accepted at c) and io would occur. It is therefore with one Potentiometer finite with a working range of i8o = and more, before alone at the fully rotatable potentiometer shown in the exemplary embodiment is required, to choose the transmission ratio between the two grinders as an odd number. l-'likewise it is expedient. at the moment of switching from the metal ring to the winding ring not to start continuous control immediately. because otherwise a very precise one Backlash-free movement transmission between the two grinders and a very precise one Execution of the lletallsegineiite would be required. This is ensured by the soldering and 8 short-circuited turns could instead of the short-circuited turns Of course you can also step a metal sail, but that prepares you for the Making greater difficulty.

For the practical implementation of the new potentiometer, it recommends themselves. Winding ring and 'metal ring to be arranged concentrically to one another, as this a considerable saving of space is achieved in the first place. This training is in Fig. ? shown in section and in Fig. 3 in plan view. The grinder 2 slides while T over the inner wall of the winding ring i and is on an axis of rotation i i attached. This is via a gear 12 and a slot 13 from a counter motor 14 driven, the one hand, in turn, be connected to a Poteatiotneter can. that of one the angular velocity of a vehicle deviating from the oar measuring device is set. The grinder 4 is on one around the axis of rotation i i rotatably mounted hollow shaft 1.3 attached, which is also from the 'motor 1.1 Adjusted via a reduction gear consisting of the gears 16 to ig will. The tension is applied to the wiper by a pressure contact 20 at its pivot point and fed to the wiper .4 through a sliding contact 21.

It can be seen that by the arrangement of the metal ring within des @ N'icklungsringe: no additional space is required with regard to the entry mentioned known potentiometer training arises. It can even be the winding ring kept much smaller "- earth. because here the same winding over one around a multiple larger angle of rotation is accommodated. In addition, therefore a better level of precision is achieved even when using thicker wires. The latter brings significant manufacturing simplifications, especially in terms of execution of the \ appropriation.

In general, in the embodiment shown, the fine gradation is only desired in your winding part with your tap. One could therefore the other. In the picture above, omit the winding part and instead replace segment 5 of the metal ring with a winding that may extend over a larger angular range than segment 5.

Claims (5)

PATENT CLAIMS: i. Consists of a ring-shaped potentiometer Switching device, especially in connection with a counter motor, in which the potentiometer is divided into a winding ring and a metal ring, the are each provided with a slider, which is driven by the same encoder, but takes place at different speeds, characterized in that the metal ring (3) interrupted at two opposite points by inserted metal segments (5, 6) is that insulates against it and is conductive with the wiper (2) of the winding ring are connected. 2. Switching device according to claim i, characterized in that Winding ring (i) and metal ring (3) connected in parallel to a common voltage source lie, with several turns through at the connection points of the winding ring Solderings (7, 8) are short-circuited. 3. Switching device according to claim 2, characterized by such a dimensioning of the formed by the short-circuited turns Angle of rotation range that at the moment when the metal ring grinder starts running (4) on one of the segments (5, 6) switching of the grinder (2) of the Winding ring is already within this angle of rotation range. 4. Switching device according to claim i or the following, characterized in that the winding ring (i) and Metal ring (3) concentric to one another, preferably the metal ring within of the winding ring are arranged. 5. Switching device according to claim i or the following with a potentiometer, the working range of which extends over i8o ° and more, characterized in that the two sliders (2, 4) are interposed a reduction gear are driven such that the number of revolutions of the The wiper (2) of the winding ring is an odd whole multiple of the number of revolutions of the metal ring grinder (4). To delimit the subject matter of the invention from State of the art, the following publication is considered in the grant procedure British Patent No. 14461 dated 19i4.