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DE-102024132703-A1 - Clamping device for clamping a workpiece

DE102024132703A1DE 102024132703 A1DE102024132703 A1DE 102024132703A1DE-102024132703-A1

Abstract

The invention relates to a clamping and/or gripping device (100) for clamping a workpiece (200) with a threaded spindle (110) extending along a spindle longitudinal axis (310) and comprising a first threaded section with a first thread pitch, a second threaded section with a second thread pitch, a third threaded section with a third thread pitch, and a fourth threaded section with a fourth thread pitch, wherein the first thread pitch differs from the second thread pitch and the third thread pitch differs from the fourth thread pitch, wherein a first spindle nut (140) engages with the first threaded section, a second spindle nut (142) engages with the second threaded section, a third spindle nut (143) engages with the third threaded section, and a fourth spindle nut (144) engages with the fourth threaded section (122), and with a guide rail (170) extending parallel to the spindle longitudinal axis (310) and on which the threaded spindle (110) is rotatably mounted.

Inventors

  • Johannes Volzer

Assignees

  • FESTO SE & CO. KG

Dates

Publication Date
20260513
Application Date
20241108

Claims (16)

  1. Clamping and/or gripping device (100) for clamping a workpiece (200) with a threaded spindle (110) extending along a spindle longitudinal axis (310) and having a first threaded section (112) with a first thread pitch, a second threaded section (113) with a second thread pitch, a third threaded section (121) with a third thread pitch, and a fourth threaded section (122) with a fourth thread pitch, wherein the first thread pitch differs from the second thread pitch and the third thread pitch differs from the fourth thread pitch, wherein a first spindle nut (140) engages with the first threaded section (112), a second spindle nut (142) engages with the second threaded section (113), a third spindle nut (143) engages with the third threaded section (121), and a fourth spindle nut (144) engages with the fourth threaded section (122), and with a guide rail (170) parallel to the spindle longitudinal axis (310) extends and on which the threaded spindle (110) is rotatably mounted, wherein the first spindle nut (140) is linearly movable and rotationally fixed on a first rail section of the guide rail (170) and the fourth The spindle nut (144) is mounted linearly movable and rotationally fixed on a second rail section of the guide rail (170), with a first clamping arm (150) pivotally mounted about a secondary axis (302) on the second spindle nut (142), and with a first connecting device (180) pivotally mounted about a first primary axis (301) on the first spindle nut (144) and pivotally mounted about a second primary axis (303) on the first clamping arm (150), wherein the first primary axis (301), the second primary axis (303) and the secondary axis (302) are aligned parallel to each other and wherein the second primary axis (303) is spaced apart from the secondary axis (302), as well as with a second clamping arm (160) pivotally mounted about a tertiary axis (305) on the third spindle nut (143), and with a second connecting device (182), which is pivotably mounted about a first quaternary axis (304) on the fourth spindle nut (144) and pivotably mounted about a second quaternary axis (306) on the second clamping arm (160), wherein the first quaternary axis (304), the second quaternary axis (306) and the tertiary axis (305) are aligned parallel to each other and wherein the second quaternary axis (306) is spaced apart from the tertiary axis (305).
  2. Clamping and/or gripping device (100) according to Claim 1 characterized in that the first thread pitch and the fourth thread pitch are the same and/or that the second thread pitch and the third thread pitch are the same.
  3. Clamping and/or gripping device (100) according to one of the preceding claims, characterized in that the first clamping arm (150) and the second clamping arm (160) are pivoted in opposite directions when the threaded spindle (110) is rotated.
  4. Clamping and/or gripping device (100) according to one of the preceding claims, characterized in that the first thread section (112) has a larger pitch than the second thread section (113) and/or that the fourth thread section (122) has a larger pitch than the third thread section (121).
  5. Clamping and/or gripping device (100) according to one of the preceding claims, characterized in that the first threaded section (112) and the second threaded section (113) have the same thread direction and/or that the third threaded section (121) and the fourth threaded section (122) have the same thread direction, wherein preferably the thread direction of the first threaded section (112) and the thread direction of the fourth threaded section (122) differ from each other.
  6. Clamping and/or gripping device (100) according to one of the preceding claims, characterized in that along the longitudinal axis of the spindle (310) the second threaded section (113) follows the first threaded section (112), the third threaded section (121) follows the second threaded section (113) and the fourth threaded section (122) follows the third threaded section (121).
  7. Clamping and/or gripping device (100) according to one of the preceding claims, characterized in that the first threaded section (112) and the second threaded section (113) together form a first spindle part (111) of the threaded spindle (110) and the third threaded section (121) and the fourth threaded section (122) together form a second spindle part (120) of the threaded spindle (110), wherein the first spindle part (111) and the second spindle part (120) are coupled to each other in a rotationally fixed manner and linearly relative in movement along the longitudinal axis (310) of the spindle.
  8. Clamping and/or gripping device (100) according to Claim 7 , characterized by an adjusting device (115) for adjusting the distance between the first spindle part (111) and the second spindle part (120) with respect to the spindle longitudinal axis (310).
  9. Clamping and/or gripping device (100) according to Claim 8 , characterized in that the first spindle part (111) has a connecting recess (114) extending along the longitudinal axis (310) of the spindle and the second spindle part (120) has a connecting extension (123) extending along the longitudinal axis (310) of the spindle, wherein the connecting recess (114) has an internal profile cross-section geometrically similar to an outer profile cross-section of the connecting extension (123).
  10. Clamping and/or gripping device (100) according to Claim 9 , characterized in that the adjusting device (115) has a through bore (116) projecting from the outside into the connecting recess (114) in the area of the connecting recess (114), and in the area of the connecting extension (123) a core hole (124) extending from the outside to the inside with a fixing thread and a fixing screw (125), wherein the fixing screw (125) is guided through the through bore (116), screwed into the core hole (124) and pressed against a fixing area (117) surrounding the through bore (116) in order to fix a distance of the first spindle part (111) to the second spindle part (120) with respect to the spindle longitudinal axis (310).
  11. Clamping and/or gripping device (100) according to one of the preceding claims, characterized in that the first rail section has a first groove in which a first guide section of the first spindle nut (140) is linearly movable, and/or that the second rail section has a second groove in which a second guide section of the fourth spindle nut (144) is linearly movable.
  12. Clamping and/or gripping device (100) according to one of the preceding claims, characterized in that the first clamping arm (150) further comprises a first arm section and a second arm section, between which a first recess extending through the first clamping arm (150) is arranged and/or that the second clamping arm (160) further comprises a third arm section and a fourth arm section, between which a second recess extending through the second clamping arm (160) is arranged, wherein preferably the first arm section and the second arm section at least partially enclose the second spindle nut (142) and/or the third arm section and the fourth arm section at least partially enclose the third spindle nut (143).
  13. Clamping and/or gripping device (100) according to one of the preceding claims, characterized in that the first connecting device (180) has a first coupling arm and a second coupling arm and/or that the second connecting device (182) has a third coupling arm and a fourth coupling arm, wherein preferably the first coupling arm and the second coupling arm are aligned parallel to each other and/or the third coupling arm and the fourth coupling arm are aligned parallel to each other, wherein preferably the first coupling arm and the second coupling arm enclose the first clamping arm (150) and/or the third coupling arm and the fourth coupling arm enclose the second clamping arm (160).
  14. Clamping and/or gripping device (100) according to one of the preceding claims, characterized in that the first spindle nut (140) is designed such that the second primary axis (303) is located in a first pivot plane oriented transversely to the spindle longitudinal axis (310), which is arranged in the direction of the second spindle nut (142) spaced apart from the first spindle nut (140) and/or that the fourth spindle nut (144) is designed such that the second quaternary axis (306) is located in a second pivot plane oriented transversely to the spindle longitudinal axis (310), which is arranged in the direction of the third spindle nut (143) spaced apart from the fourth spindle nut (144).
  15. Clamping and/or gripping device (100) according to one of the preceding claims, characterized in that a drive device (130) is provided with which the threaded spindle (110) can be driven.
  16. Clamping and/or gripping device (100) according to Claim 15 , characterized in that the drive device (130) has an electric motor (132) and a current monitoring device (134) for monitoring the torque applied by the electric motor (132).

Description

The invention relates to a clamping and/or gripping device for clamping a workpiece. In the manufacturing and transport of workpieces, toggle clamps and grippers are well-known clamping and/or gripping devices for securing workpieces to enable safe processing or transport. Toggle clamps offer the advantage of being able to move quickly over a large angular range using a feed motion, followed by a slower clamping motion with high clamping forces. The object of the present invention is to provide a clamping and/or gripping device with which workpieces can be securely clamped during a large number of clamping operations. This task is solved by a clamping and/or gripping device for clamping a workpiece with the following features: A clamping and/or gripping device according to the invention for clamping a workpiece comprises a threaded spindle which runs along a spindle longitudinal axis and which has a first threaded section with a first thread pitch, a second threaded section with a second thread pitch, comprising a third threaded section with a third thread pitch and a fourth threaded section with a fourth thread pitch, wherein the first thread pitch differs from the second thread pitch and the third thread pitch differs from the fourth thread pitch, wherein a first spindle nut engages with the first threaded section, a second spindle nut engages with the second threaded section, a third spindle nut engages with the third threaded section and a fourth spindle nut engages with the fourth threaded section, and a guide rail extends parallel to the longitudinal axis of the spindle and on which the threaded spindle is rotatably mounted, wherein the first spindle nut is linearly movable and rotationally fixed on a first rail section of the guide rail and the fourth spindle nut is linearly movable and rotationally fixed on a second rail section of the guide rail, a first clamping arm pivotally mounted about a secondary axis on the second spindle nut, and a first connecting device which is pivotably mounted about a first primary axis on the first spindle nut and pivotably mounted about a second primary axis on the first clamping arm, wherein the first primary axis, the second primary axis and the secondary axis are aligned parallel to each other and wherein the second primary axis is spaced apart from the secondary axis, as well as a second clamping arm which is pivotably mounted about a tertiary axis on the third spindle nut, and a second connecting device which is pivotably mounted about a first quaternary axis on the fourth spindle nut and pivotably mounted about a second quaternary axis on the second clamping arm, wherein the first quaternary axis, the second quaternary axis and the tertiary axis are aligned parallel to each other and wherein the second quaternary axis is spaced apart from the tertiary axis. The first, second, third, and fourth spindle nuts each have an internal thread corresponding to their respective thread section. Since the first and second thread pitches differ, it is not possible to engage the first spindle nut with the second thread section. Similarly, it is not possible to engage the second spindle nut with the first thread section. Therefore, when the first and second thread sections are adjacent, the first spindle nut cannot engage the second thread section, and the second spindle nut cannot engage the first thread section. Likewise, it is not possible to engage the third spindle nut with the fourth thread section, nor vice versa, because the third and fourth thread pitches are shaped differently. Therefore, if the third and fourth thread sections are adjacent, the third spindle nut cannot engage with the fourth thread section. Furthermore, it is then impossible for the fourth spindle nut to engage with the third thread section. The threaded spindle can be mounted directly on the guide rail. For this purpose, a rotary bearing can be formed on the guide rail, which is designed for the rotational support of the threaded spindle about its longitudinal axis, also known as the axis of rotation. The rotary bearing can also provide a fixed connection between the threaded spindle and the guide rail. The spindle and the guide rail are designed so that the threaded spindle has only one rotational degree of freedom and no translational degree of freedom relative to the guide rail. Alternatively, the rotary bearing can be formed on another component of the clamping and/or gripping device, for example, a drive unit for the clamping and/or gripping device, and this other component can be coupled directly or indirectly to the guide rail. Here, too, the first spindle nut can have no rotational degree of freedom relative to the guide rail and only a single translational degree of freedom with its linear movement along the spindle's longitudinal axis. Preferably, two rotary bearings are provided, a first rotary bearing being assigned to an outer end of the threaded spindle and a second rotary bearing be