Mobile power tool

Patent metadata

Field	Value
Publication number	US-11325198-B2
Application number	US-201816651718-A
Country	US
Kind code	B2
Filing date	Sep 27, 2018
Priority date	Sep 29, 2017
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A mobile machine tool (10), namely a manually-operated machine tool or semi-stationary machine tool, for machining a workpiece (W), wherein the machine tool has a plate-like guide element (30) with a guide surface (32) for guiding the machine tool on the workpiece (W) or the workpiece (W) on the machine tool, wherein the machine tool has a drive unit (11) with a drive motor (13) for driving a tool holder (14) arranged on the drive unit (11), wherein the drive unit (11) is, by means of a bearing arrangement (35), mounted adjustably on the guide element (30) in order to adjust at least two adjustment positions (S0, S1, S2) of the tool holder (14) relative to the guide surface (32) in which a work tool (15) arranged on the tool holder (14), penetrates into the workpiece (W), to different penetration depths. The machine tool (10) is provided with a height measuring device (95) for detecting a height (H) of the workpiece (W), wherein the height corresponds to a distance between an upper side (WO) of the workpiece which is to be penetrated by the work tool (15) and a workpiece underside (WU) of the workpiece (W) opposite the upper side of the workpiece (W).

First claim

The invention claimed is:

1. A mobile machine tool, for machining a workpiece, wherein the machine tool has a guide element with a guide surface for guiding the machine tool on the workpiece or the workpiece on the machine tool, wherein the machine tool has a drive unit with a drive motor for driving a tool holder arranged on the drive unit, wherein the drive unit is, by means of a bearing arrangement, mounted adjustably on the guide element in order to adjust at least two adjustment positions of the tool holder relative to the guide surface in which a work tool arranged on the tool holder penetrates into the workpiece, to different penetration depths, wherein the machine tool is provided with a height measuring device for detecting a height of the workpiece, wherein the height corresponds to a distance between an upper side of the workpiece which is to be penetrated by the work tool and a workpiece underside of the workpiece opposite the upper side of the workpiece, and wherein a section of the guide surface extends in front of the height measuring device, with which the guide surface can be supported on the upper side of the workpiece or on a guide device, lying on the upper side of the workpiece or on which the workpiece can be supported.

2. The mobile machine tool according to claim 1 , wherein the height measuring device is configured to detect an upper workpiece edge between an end face of the workpiece and the upper side of the workpiece and/or to detect a lower workpiece edge between an end face of the workpiece and the workpiece underside.

3. The mobile machine tool according to claim 1 , wherein the guide surface has opposed first and second longitudinal end regions and wherein the height measuring device is arranged on the first longitudinal end region of the guide surface and a detection range of the height measuring device is oriented in the direction of the second longitudinal end region of the guide surface.

4. The mobile machine tool according to claim 1 , wherein the height measuring device is provided with at least one optical sensor and/or a camera.

5. The mobile machine tool according to claim 1 , wherein the height measuring device is provided with at least one distance sensor.

6. The mobile machine tool according to claim 1 , wherein the height measuring device is provided with at least one reference light source in order to generate a linear or point-formed reference marking on the workpiece.

7. The mobile machine tool according to claim 6 , wherein the height measuring device is configured to determine at least one workpiece edge of the workpiece on the basis of a light reflection of a reference light generated by the reference light source.

8. The mobile machine tool according to claim 6 , wherein the height measuring device is configured to determine the height of the workpiece on the basis of a change in direction and/or change in speed of a light reflection of the reference light generated by the reference light source in the event of a movement of the machine tool in relation to the workpiece.

9. The mobile machine tool according to claim 8 , wherein the height measuring device is configured to determine the height of the workpiece on the basis of a distance travelled by the light reflection transversely to a direction along which the machine tool is moved relative to the workpiece.

10. The mobile machine tool according to claim 6 , wherein at least one optical filter, is fitted in front of the reference light source and/or an optical sensor for detecting the reference marking.

11. The mobile machine tool according to claim 1 , wherein the sensor or a single sensor of the height measuring device is formed by a tool sensor for detecting a workpiece contact region in which the work tool is in contact with the workpiece, and/or for detecting a section of the workpiece located in front of the work tool, viewed in a working direction.

12. The mobile machine tool according to claim 1 , wherein the height measuring device is configured to detect a machined edge formed through a machining of the workpiece by the work tool.

13. The mobile machine tool according to claim 1 , further comprising a display device for displaying information supplied by the height measuring device.

14. The mobile machine tool according to claim 13 , wherein the information supplied by the height measuring device comprises at least one marking indicating a workpiece edge and/or at least a partial region of the workpiece and/or a height specification for the height of the workpiece.

15. The mobile machine tool according to claim 1 , wherein the tool is configured to determine a specified penetration depth of the work tool on the basis of the height of the workpiece determined by the height measuring device.

16. The mobile machine tool according to claim 15 , further comprising an actuating drive in order to adjust the drive unit relative to the guide element depending on the specified penetration depth and/or a depth adjustment device in order to adjust a penetration depth of the work tool in the workpiece with at least one stop element which is adjustable according to the specified penetration depth.

17. The mobile machine tool according to claim 1 , wherein the height measuring device is arranged in a dust extraction region and/or beneath a covering.

18. The mobile machine tool according to claim 1 , wherein the height measuring device uses a marking arranged on the guide element or a housing of the machine tool in order to orient the machine tool to a workpiece edge, and/or is configured to display an optical marking as well as an image of the workpiece edge on a display device.

19. The mobile machine tool according to claim 1 , wherein the height measuring device is configured to dynamically detect at least one workpiece edge, during a relative movement of the workpiece and the machine tool.

20. The mobile machine tool according to claim 19 , wherein, on recognising at least one workpiece edge, the height measuring device registers the distance from the other workpiece edge.

21. The mobile machine tool according to claim 1 , wherein the machine tool has at least one tool sensor for detecting the workpiece contact region and at least one position sensor, separate from the tool sensor, for detecting a relative position of the drive unit relative to the guide element, and wherein the machine tool has an evaluation device for evaluating sensor signals of the position sensor and of the tool sensor.

22. A mobile machine tool, for machining a workpiece, wherein the machine tool has a guide element with a guide surface for guiding the machine tool on the workpiece or the workpiece on the machine tool, wherein the machine tool has a drive unit with a drive motor for driving a tool holder arranged on the drive unit, wherein the drive unit is, by means of a bearing arrangement, mounted adjustably on the guide element in order to adjust at least two adjustment positions of the tool holder relative to the guide surface in which a work tool arranged on the tool holder penetrates into the workpiece, to different penetration depths, wherein the machine tool is provided with a height measuring device for detecting a height of the workpiece, wherein the height corresponds to a distance between an upper side of the workpiece which is to be penetrated by the work tool and a workpiece underside of the workpiece opposite the upper side of the workpiece, and wherein the height measuring device is configured to detect a machine

Assignees

• Festool Gmbh

Inventors

• Frank Josua
• Kübeler Matthias

Classifications

• B23D45/16

  Hand-held sawing devices with circular saw blades · CPC title

• B23D59/001

  Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade (measuring in general G01; controlling in general G05) · CPC title

• B23D59/002 Primary

  for the position of the saw blade (mounting for swiveling or tilting a circular saw blade B27B5/36; portable power-driven circular saws with adjustment for cutting depth or amount of tilting B27B9/02) · CPC title

• B27B9/02 Primary

  Arrangements for adjusting the cutting depth or the amount of tilting · CPC title

• B25F5/021

  with guiding devices (guiding devices for hand tools on stands or supports B25H1/0078) · CPC title