Stop with a front to limit the movement of a body

Abstract

In the case of a stop with a front (1) for limiting the movement of a body, for example a tool or a workpiece, particularly in a machine tool for machining dimensionally accurate workpieces, wherein the front (1) is assigned to an end stop (4), the distance (a) of the front (1) relative to the end stop (4) should be variable.

Description

Technical area

[0001] The invention relates to a stop with a front for limiting the movement of a body, for example a tool or a workpiece, in particular in a machine tool for machining dimensionally accurate workpieces, wherein the front is assigned to an end stop. State of the art

[0002] In many everyday situations, stops are necessary to limit the movement of a body. For example, consider the swinging motion of a door or window, where a stop prevents it from opening too far.

[0003] However, especially in the production or machining of workpieces, stops are absolutely necessary to ensure that a desired work process is completed properly. The necessity of providing stops is very great, which is why further examples are omitted. The present invention relates to any stop.

[0004] Commonly known, for example, are stops with spindles along which any stop can be adjusted. In this case, the servo ball screw will be mentioned only as an example. However, these have disadvantages, primarily regarding axial load capacity and cost.

[0005] For example, a pre-adjustable fixed machine stop is known from DD 24 29 315 A1. It is particularly suitable for automatic lathes and consists of a base body attached to a machine slide and an interchangeable fixed stop comprising the following components: guide pin, threaded spindle, spindle nut, stop pin, scale ring, and locking nut. The stop pins are interchangeable and graduated in dimensional increments.

[0006] DD 276 404 A3 also relates to an adjustable fixed stop, particularly for strip material that is to be cut to length on spring machines. A thread is provided on a shaft. A stop nut equipped with a stop piece runs on the thread. The stop nut is detachably connected to the stationary housing via an anti-twist device and is guided within it. Arranged on the same shaft is a counter-stop, clamped to a driver and carrying a stop piece. When the shaft moves, the stop nut executes an axial movement relative to the shaft, while the axially fixed counter-stop executes a rotating movement parallel to the shaft. Rough and fine adjustment of the required lengths are possible on the machine. Object of the invention

[0007] The object of the present invention is to provide a stop of the above-mentioned type which is very simple both in its construction and in its mode of operation, but in which an adjustment of the stop is possible at any time, even with assured accuracy of the setting. Solution to the task

[0008] The solution to the problem is that the distance of the front from the final stroke can be changed.

[0009] While according to the prior art, in order to change the distance between the front and the end stop, the end stop usually has to be loosened and reattached at another location, according to the present invention the connection between the front and the end stop remains, but the front is moved.

[0010] For the purposes of the present invention, a "front" refers to anything that limits the movement of a body. The front can be flat, pointed, or hollowed; it only needs to ensure that the body stops at a specific, desired location.

[0011] Many options are also conceivable for the end stop. The end stop could be a plate, a frame, or a housing, which is preferred in this case.

[0012] It is preferred that the distance between the front and the end stop be continuously adjusted. This makes it possible to change the distance, for example, even during an ongoing production process, if desired or necessary.

[0013] In a preferred embodiment, the front is to be part of an external telescopic device. This telescopic device has at least one telescopic element that is axially movable in an end stop designed as a housing. The telescopic element is intended to virtually disappear into the housing, thus changing the distance between the front and the housing. This is achieved by the telescopic element having an external thread that rotates within an internal thread in the housing.

[0014] To expand the range of adjustment of the distance between the front and the end stop, one or more such telescopic elements are provided in axial succession. These can slide into one another. In this process, a subsequent telescopic element with an external thread rotates within the internal thread of the preceding telescopic element. The threads can be aligned, but do not have to be. When one of the telescopic elements reaches its end position, the rotation of the threads is passed on to one or more of the subsequent threads.

[0015] This rotation of the outer telescoping device is, of course, important. In a preferred embodiment, an inner telescoping device is located within the outer telescoping device. This consists of individual telescopic sleeves that can be telescoped into one another. To ensure that they remain connected during operation, it must be ensured that they cannot be easily separated from one another. For this purpose, the telescoping sleeves form an annular collar at the end, which abuts against an inner shoulder inside a subsequent telescoping sleeve to limit its movement.

[0016] The inner telescoping device has the task of rotating the outer telescoping device, and in particular the telescoping elements, around their longitudinal axis. For this purpose, at least one telescoping sleeve should be connected to a telescoping element in a rotationally fixed manner. This is usually the last telescoping sleeve, which in this case is designed as a telescoping rod. It represents a polygon, e.g. a hexagon, which engages in a corresponding polygonal hole in a telescoping element. This creates a rotationally fixed connection between the two telescoping devices. For assembly, it has proven advantageous if the front is attached to the polygon, which is then designed as a hexagon nut, for example. Instead of a polygon, other geometric shapes are of course also conceivable, such as an ellipse, etc. The only important thing is that this geometric shape can slide securely into a holder and is also suitable for power transmission.

[0017] The inner telescoping mechanism can be driven in any way. A rotary drive with an electric motor is preferred.

[0018] The distance between the front and the end stop is preferably determined using a measuring tape, which in one embodiment can be a magnetic tape with an associated sensor. This sensor is then connected to the front. Character description

[0019] Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings, which show: Fig. 1 a side view of a stop according to the invention with a front for limiting the movement of a body not shown in the extended working position; Fig. 2 a side view of the stop according to the invention Fig. 1 in retracted working position; Fig. 3 a longitudinal section rotated by 90° through the stop according to Fig. 1; Fig. 4 a longitudinal section of the stop rotated by 90° according to Fig. 2. Example

[0020] According to Fig. 1, a stop P has a front 1 against which any body whose movement is to be limited impinges. This front 1 is connected via a crossbeam 2 to a measuring device 3, via which a distance a between the front 1 and a housing 4 can be determined. This housing 4 is generally arranged in a fixed position, for example, on a machine tool, but it can also be arranged on a carriage or the like.

[0021] Next to the housing 4, a motor 5 is provided, which has a connection 6, for example, to control electronics and / or a power supply. A gear housing 7 is provided between the motor 5 and the housing 4, which contains elements for a drive described later.

[0022] The front 1 is moved by an external telescopic device 8, which consists of individual telescopic elements 9.1 to 9.3 that can be moved into one another. Fig. 1 these telescopic elements 9.1 to 9.3 are extended, in Fig. 2 they are pushed into each other.

[0023] According to Fig.3, the telescoping element 9.1 is rotatably and axially displaceably mounted in the housing 4. It has an external thread 10.1 that meshes with an internal thread 11.1 in the housing 4. Likewise, the telescoping element 9.2 has an external thread 10.2 that meshes with an internal thread 11.2 in the telescoping element 9.1. The same applies to the telescoping element 9.3, which interacts with an external thread 10.3 and an internal thread 11.3 in the telescoping element 9.2.

[0024] The outer telescoping device 8 is driven by the motor 5, a toothed belt 12, and an inner telescoping device 13. The toothed belt 12 wraps around a pulley 14, which is mounted on a shaft 15 of the motor 5, on the one hand. On the other hand, it wraps around a further pulley 16, which is mounted on a free end of a first telescoping sleeve 17.1 of the inner telescoping device 13. A subsequent telescoping sleeve 17.2 is inserted into this telescoping sleeve 17.1, and a telescoping rod 18 is inserted into this. Both the telescoping rod 18 and the telescoping sleeve 17.1 can slide axially in the telescoping sleeve 17.2 or 17.1, respectively, with an annular collar 20.1 or 20.2, which interacts with an inner shoulder 21.1 or 21.2, respectively, preventing these elements from separating.

[0025] At least the telescopic rod 18 is designed as a polygon and is secured against rotation in a corresponding bore 22 of the telescopic element 9.3, so that the latter is carried along when the telescopic rod 18 rotates. In the illustrated embodiment, the front 1 is mounted at the end of the telescopic rod 18.

[0026] The operation of the present invention is as follows: The housing 4 with the attached motor 5 and the gear housing 7 is attached to a machine tool or a tool, for example. It is intended to limit any movement of any body. To do this, the front 1 is moved into a desired position, which is determined, for example, using the measuring device 3. This starts the motor 5, which then transfers its rotary motion via the toothed belt 12 to the inner telescoping device. This now rotates about its axis, with the telescoping rod 18 driving the telescoping element 9.1 / 9.2 / 9.3 with it, since it sits non-rotatably on the telescoping rod 18 due to its polygonal design. By rotating the inner telescoping device 13, the telescoping elements 9.1 to 9.3 of the outer telescoping device 8 are also driven via the interacting threads 10.3 / 11.3 or 10.2 / 11.2 or 10.1 / 11.1.This sequence is preferably not forced, but rather when the corresponding threads allow it. Of course, stopping a telescopic element 9.1 to 9.3 at any stop forces the transition to a different thread.

[0027] This allows for very precise adjustment of Front 1. Likewise, the position of Front 1 can be changed very quickly, if desired during a production process. List of reference symbols 1 front 2 traverses 3 Measuring device 4 housings 5 Engine 6 Connection 7 Gearbox housing 8 Outer telescopic device 9 Telescopic element 10 external threads 11 internal thread 12 timing belts 13 Internal telescopic device 14 pulley 15 Wave 16 pulley 17 Telescopic sleeve 18 Telescopic sleeve rod 19 20 Ring collar 21 Inside shoulder 22 Hole a distance P stop QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DD 24 29 315 A1

[0005] DD 276 404 A3

[0006]

Claims

[1] Stop with a front (1) for limiting the movement of a body, for example a tool or a workpiece, in particular in a machine tool for machining dimensionally stable workpieces, wherein the front (1) is associated with an end stop (4), characterized by that the distance (a) of the front (1) relative to the end stop (4) is variable. [2] Stop according to claim 1, characterized by that the distance (a) of the front (1) relative to the end stop (4) can be continuously changed. [3] Stop according to claim 1 or 2, characterized by that the front (1) is part of an external telescopic device (8). [4] Stop according to claim 3, characterized by that the outer telescoping device (8) has at least one telescoping element (9.1) which is accommodated in an axially movable manner in a housing (4) designed as an end stop. [5] Stop according to claim 4, characterized bythat the telescopic element (9.1) has an external thread (10.1) which rotates in an internal thread (11.1) in the housing (4). [6] Stop according to claim 4 or 5, characterized by that further telescopic elements (9.2,9.3) which can be pushed into one another axially are provided in the telescopic element(s). [7] Stop according to claim 6, characterized by that a respective subsequent telescopic element (9.2,9.3) with an external thread (10.2,10.3) rotates in an internal thread (11.2,11.3) of the preceding telescopic element. [8] Stop according to at least one of claims 3-7, characterized by that the outer telescopic device (8) is assigned an inner telescopic device (13). [9] Stop according to claim 8, characterized by that the inner telescopic device (13) consists of individual telescopic sleeves (17.1,17.2) or telescopic rod (18) which can be moved telescopically into one another. [10] Stop according to claim 9, characterized by that telescopic sleeves (17.1,17.2) or telescopic rod (18) form an annular collar (20.1,20.2) at the end, which abuts against an inner shoulder (21.1,21.2) inside a subsequent telescopic sleeve to limit its movement. [11] Stop according to claim 8 or 9, characterized by that at least one telescopic sleeve (17.1,17.2) or the telescopic rod (18) is connected in a rotationally fixed manner to a telescopic element (9.3). [12] Stop according to claim 11, characterized by that at least one telescopic sleeve (17.1,17.2) or a telescopic rod (18) with a polygon is received in a polygonal bore (22) of a telescopic element (9.3). [13] Stop according to claim 12, characterized by that the front (1) is placed on the polygon. [14] Stop according to at least one of claims 8-13, characterized by that the inner telescopic device (13) is connected to a rotary drive. [15] Stop according to at least one of the preceding claims, characterized by that a tape measure is provided to determine the position of the front (1). [16] Stop according to claim 15, characterized by that the measuring tape is a magnetic tape and a sensor is assigned to it [17] Stop according to claim 16, characterized by that the sensor is connected to the front (1).

Images