SE521520C2 - Device for rotating an object between predetermined rotational positions - Google Patents

Abstract

The apparatus has two force actuators (1) with one end pivotally supported around a stationary pivot axis (10) parallel to an axis of rotation (40). The actuators have another displaceable end connected to a common follower body (14) engaging a slot (44) in an object (43). The force actuators have a common control device to transfer the object to the successive rotary positions (30-33).

Description

l5 20 25 30 35 40 521 520 2 the cylinder housing ends of the cylinders and the axis of rotation of the object lie between the largest and smallest lengths of the cylinders. By providing a guide which adjusts the cylinders between its end positions at a time interval, the two cylinders can rotate the object between its predetermined angular positions, in turn, and in the desired direction around the axis of rotation. The cylinders have stable end positions, which ensures that the object's angular rotation positions are stable and accurate.

Instead of pneumatic cylinders, you can of course use hydraulic cylinders, linear electric motors with two end positions or other power sensors with two distinct end positions. An advantage of the invention is further that only two such power sensors are required, and that no locking effects occur, since the apex angle between the power sensors connected to each other never passes 180 °.

The invention will be described in the following in an exemplary form with reference to the accompanying drawing.

Fig. 1 schematically shows a side view of a device according to the invention, Fig. 2 schematically shows a sectioned view taken along the line 11-11 in Fig. 1.

Fig. 1 shows a shaft shaft 42, which is mounted by means of a bearing 46. The shaft 42 has a radial slot directed towards the shaft 40 for rotation about a shaft 40, which is shown to be vertical. carries a turntable 43, 44, body 14 received substantially without play between the walls 44 of the slot 44. which is illustrated to be open to the outside. In the slot 44 is a round follower- The follower body 14 is carried at the end of a shaft shaft 13, which is directed parallel to the shaft 40. The shaft 13 is substantially playlessly received in coaxial bores in the legs of a pair of forks 16, which are connected to the piston rod ends of a pair of pneumatic cylinders 1, the cylinder housing ends of which are rotatably mounted about stationary bearing shafts 10, which are parallel to the shaft 42.

The axis of the shaft 13, i.e. the follower body 14, can assume four distinct positions, which are determined by the possible combinations of the end positions of the two interconnected piston rod ends. These positions 31, the adjacent positions around the axis 40 are 90 °. 30, 32 and 33, respectively. The angular distance between the Since the angle 10 l 15 between the piston rods 12 of the cylinders 1 does not exceed 180 °, there is no risk that the device experiences dead center reading. The depth of the slot 44 is selected to contain the body 30 in all positions.

The object 43 can be a turntable which in turn carries, for example, a bracket for a workpiece, which is to be adjusted in the different angular positions which are 90 ° apart from each other.

Fig. 2 schematically illustrates that the cylinders 1 are controlled by a guide device 60, which has means 61 which ensure that the two cylinders 1 are adjusted with a time interval for displacement of the body 14 between circumferentially adjacent, 90 ° separated, angular positions 30, 31, 32 , 33.

Of course, the cylinders l can be controlled manually. Alternatively, the control device 60 may comprise delay devices which ensure that the two cylinders 1 are switched at least at a predetermined time interval. The time interval between the activation of the pneumatic cylinders 1 is relatively uncritical, as the cylinders are pneumatic cylinders, while the drive flows and their time relation must of course be better adapted if hydraulic cylinders or linear motors or other power sensors are used instead of pneumatic cylinders 1.

Claims (6)

10 15 25 25 25 35 Patent claim Device for adjusting four angularly spaced apart (30-33) (43) (40), characterized by two power sensors (1), first end which is pivotally mounted about a stationary pivot axis (10) rotational positions of an object about an axis of rotation each having one which is parallel to the axis of rotation (40), each (16) of which the pivot axes of the transducers the transducer has an end which is displaceable towards and away from (10) where this distance is the first end, are located at an equal distance from the axis of rotation (40), between the largest and smallest distances between the ends of the sensors, that they (16) have a slot (42) and that the sensors (1) of the other ends (14) (43) of both sensors (1) are directed radially to the axis of rotation (14), which allows adjustment of the force transducers are connected to a follower (44), and which without radially has a body and that the object which is a game receives the follower body (60, 61), with mutual time difference to transfer the object to those on (30-33). joint controls the successive rotational positions ÅHOïdHin9 according to claim 1, characterized in that the force sensors (1) are pneumatic cylinders. Device according to claim 1 or 2, characterized in that the object carries a bracket for a workpiece. Device according to one of Claims 1 to 3, characterized in that the power sensors (1) are linear power sensors. Device according to one of Claims 1 to 4, characterized in that the angle between the directions of action of the force transducers (1) does not exceed 180 °. Device according to one of Claims 1 to 5, characterized in that the force transducers have an equal stroke length and an equal maximum length between their pivot axis and the follower body, so that adjacent rotational positions are 90 ° apart.