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DE-202024002726-U1 - Screw head with combined gripping and rotation mechanism

DE202024002726U1DE 202024002726 U1DE202024002726 U1DE 202024002726U1DE-202024002726-U1

Abstract

Screw head (1), in particular for a robot, comprising a screw head body (2) on which at least two pivotably mounted screw jaws (3) are arranged, which can selectively assume an open or a closed position for gripping and screwing screw caps (4), such that in the closed position the screw cap (4) is gripped and can be screwed, and in the open position the screw cap (4) is released, characterized by a combined gripping and rotational mechanism with limitable torque and freewheel, consisting of an actuator (5) axially movable centrally mounted in the screw head (1) and a gearbox (6) cooperating with the actuator (5), which is designed to convert a movement of the actuator (5) triggered by pressing the actuator (5) against the screw cap to be gripped into a closing movement of the at least two screw jaws (3) in order to grip the screw cap (4), and comprising a high-helix screw drive (8) with freewheel (7) and slip clutch (9) which is designed to convert a movement of the screw head triggered by pressing the screw head in the closed position of the screw jaws with the screw cap gripped against a screw container into a rotational movement of the screw head base body in order to screw the screw cap (4) to a screw container.

Assignees

  • THEOBALD THORSTEN

Dates

Publication Date
20260513
Application Date
20241120
Priority Date
20241120

Claims (9)

  1. Screw head (1), in particular for a robot, comprising a screw head body (2) on which at least two pivotably mounted screw jaws (3) are arranged, which can selectively assume an open or a closed position for gripping and screwing screw caps (4), such that in the closed position the screw cap (4) is gripped and can be screwed, and in the open position the screw cap (4) is released, characterized by a combined gripping and rotational mechanism with limitable torque and freewheel, consisting of an actuator (5) axially movable centrally mounted in the screw head (1) and a gearbox (6) cooperating with the actuator (5), which is designed to convert a movement of the actuator (5) triggered by pressing the actuator (5) against the screw cap to be gripped into a closing movement of the at least two screw jaws (3) in order to grip the screw cap (4), and comprising a high-helix screw drive (8) with freewheel (7) and slip clutch (9) who is trained to implement a Pressing the screw head in the closed position of the screw jaws with the screw cap gripped against a screw container triggers a movement of the screw head into a rotational movement of the screw head base body in order to screw the screw cap (4) onto a screw container.
  2. Screw head after Claim 1 , characterized in that the gearbox (6) is designed as a locking tensioning device and is combined with a steep screw drive (8), a freewheel (7) and an adjustable slip clutch (9).
  3. Screw head after Claim 1 or 2 , characterized in that the transmission (6) has a rotationally symmetrical volume element connecting the actuator (5) with the at least two screw jaws (3), in particular with a conical shoulder (5.1), which is designed to transmit the movement of the actuator (5) to the at least two screw jaws (3) and in its extension to lock and unlock the steep screw drive (8) via an eccentric mechanism (8.3).
  4. Screw head after one of the Claims 1 until 3 , characterized in that the transmission (6) has a locking mechanism for blocking the movement of the screw jaws (3) at least from the closed position of the screw jaws (3) to the open position of the screw jaws (3) and for unlocking the steep screw drive (8), such that the screw jaws (3) are locked autonomously in a state clamping the screw closure (4) and at the same time the steep screw drive (8) is unlocked, such that a pressure force exerted on the screw head is converted into a rotary movement of the screw head with a torque that can be limited via an adjustable slip clutch (9) for screwing the closure.
  5. Screw head after one of the Claims 1 until 4 , characterized in that the transmission (6) has a release mechanism for unlocking the screw jaws (3) and for locking the steep screw drive (8), such that the screw jaws (3) can be moved from their closed position to their open position in order to release the screw closure (4) and simultaneously lock the steep screw drive (8), such that a compressive force applied to the screw head is transmitted without being converted into a rotational movement of the screw head.
  6. Screw head after one of the Claims 1 until 5 , characterized in that the transmission (6) has a cam guide (6.1) and a cam block (6.2) guided in the cam guide, wherein the cam guide (6.1) has a first track section (6.3) configured to block the movement of the screw jaws (3) from the closed position to the open position and to release the locking of the steep screw drive (8) in a state in which the cam block (6.2) is located in the first track section (6.3), and has a second track section configured to release the movement of the screw jaws (3) from the closed position to the open position and to establish the locking of the steep screw drive (8) in a state in which the cam block (6.2) is located in the second track section.
  7. Screw head, according to one of the Claims 1 until 6 , characterized in that each screw jaw (3) has a first area (3.1), a second area (3.2) and a third area (3.3), wherein the first area (3.1) is in contact with the screw cap for gripping and screwing, the second area (3.2) is designed as a pivot bearing between the first and the second, and the third area (3.3) is in contact with the actuating element (5) and translates an axial compressive force into a clamping force acting radially towards the center of the axis on the screw cap (4).
  8. Screw head, according to one of the Claims 1 until 7 , characterized in that a pressure force acting externally in the axis of rotation is converted into a rotary movement for screwing screw caps (4) onto screw containers by means of a steep screw drive (8) and an adjustable slip clutch (9) to limit the torque.
  9. Screw head, according to one of the Claims 1 until 8 , characterized in that the steep screw drive (8) is combined with a freewheel (7) to generate a unidirectional direction of rotation for screwing screw closures (4) onto screw containers.

Description

The invention relates to a screw head for a closure device, in particular robot-guided, for screw caps, comprising a screw head base body on which at least two pivotably mounted screw jaws are arranged, which can selectively assume an open or closed position for gripping and screwing screw caps, such that in the closed position of the screw jaws the screw cap is gripped by the screw head and a screwing torque is transmitted, and in the open position of the screw jaws the screw cap is released, and comprising a steep-pitch screw drive with torque limitation and freewheel, which is designed to convert a linear movement of the screw head, triggered by pressing the screw head in the closed position of the screw jaws with the screw cap gripped against a screw container, into a rotational movement of the screw head base body in order to screw the screw cap. A wide variety of screw heads with jaws and gripping functions are known from industry. All such screw heads have in common that they require external drive technology and a corresponding energy supply for controlling the jaws and for rotation during screwing. This is associated with increased resource and installation space consumption, as well as mechatronic integration effort. Particularly in robots, the screw head's interference contour and mass are increased by the necessary supply of energy, drive, and control technology, thus limiting its range of application. The object of the invention is to construct a screw head, particularly suitable as a robot end effector, with autonomous gripping and rotational mechanics, which operates without an external energy supply and thus avoids the aforementioned disadvantages. The object is achieved according to the invention by a screw head, in particular for a robot, comprising a screw head base body on which at least two mounted screw jaws are arranged, which can selectively assume an open or closed position for gripping and screwing screw caps, such that in the closed position of the screw jaws the screw cap is gripped by the screw head and a screwing torque is transmitted, and in the open position of the screw jaws the screw cap is released, and comprising an actuating element movably mounted on the screw head base body and a gearbox cooperating with the actuating element, which is designed to convert a movement of the actuating element triggered by pressing the actuating element against the screw cap to be gripped into a closing movement of the at least two screw jaws in order to grip the screw cap, and comprising a steep-pitch screw drive with torque limitation and freewheel, which is designed to convert a linear movement of the screw head triggered by pressing the screw head in the closed position of the screw jaws with the gripped screw cap against a screw container into a Rotational movement of the screw head base body to tighten the screw cap. The independently pivotable screw jaws can be actuated simultaneously or sequentially. This allows for synchronous or asynchronous gripping movements. The actuator for controlling the screw jaws can, for example, be designed without a motorized actuation of the screw jaws, wherein the actuator is designed to transmit a force generated by pressure to the screw jaws for their actuation. The gearbox may have a locking mechanism or be designed as a locking mechanism. The actuator can, for example, have a cone-shaped contour which, during linear movement, generates a linear change in radius relative to a stationary body. The conically contoured actuator can be designed such that a linear movement resulting from a counter-pressure force exerted by the screw cap over a defined linear path "X" causes a corresponding increase in radius. The actuator can, for example, have an axially adjustable, cone-shaped contour which, for a given path "X", generates a defined change in radius relative to a stationary body. The adjustability can be designed such that the increase in radius causes a corresponding deflection of the screw jaws with respect to a defined path. The gearbox may have a locking mechanism to block the return movement of the screw jaws, at least from the closed to the open position, namely such that the screw jaws, while clamping a screw closure, are autonomously locked in this state, and have a further locking mechanism to block the rotational movement of the steep screw drive, at least from the open to the closed position of the screw jaws, in such a way that the steep screw drive is autonomously locked in its position. The two locking mechanisms can, for example, be designed as part of the gearbox or act on the gearbox from the outside. The gearbox may have a release mechanism for unlocking the locked screw jaws and the steep screw drive, such that the screw jaws can be moved from their closed position to their open position in order to release the screw closure, and may have a further release mechanism by which the steep screw drive can be moved from its blocked posi