Position measuring device

Abstract

To provide a position measuring device that is manufactured easily at low cost, and precisely measure a position in the longitudinal direction of a scale disposed within a casing of the position measuring device.SOLUTION: A position measuring device includes: a base body 1; a first casing part 10.1 that is extended in a longitudinal direction X and is connected to the base body 1; and a second casing part 10.2 that is extended in the longitudinal direction X and is connected to the base body 1. A hollow profile 10 is formed by at least the first casing part 10.1 and the second casing part 10.2. The position measuring device includes a scale 12 disposed inside the hollow profile 10 and a scanning unit 14 for scanning the scale 12. The base body 1 and the scale 12 are directly connected each other.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a position measuring device according to the preamble of claim 1.

Background Art

[0002] Patent Document 1 discloses a position measuring device, particularly a length measuring device. The position measuring device includes a scale in a casing that houses the scale, and a scanning unit that scans the scale. The casing or a cover element on the end side of the casing has an adjustment hole for gap adjustment at a position corresponding to the gap between the scale and the scanning unit.

[0003] Another length measuring device having a two-part profile casing is known from Patent Document 2.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The problem of the present invention is to provide a position measuring device that can be manufactured simply and at low cost and enables precise position measurement in the longitudinal direction of a scale disposed in the casing of the position measuring device.

Means for Solving the Problems

[0006] According to the present invention, this problem is solved by a position measuring device having the features of claim 1.

[0007] The position measuring device formed according to the present invention comprises a base body, a first casing portion extending longitudinally and connected to the base body, and a second casing portion extending longitudinally and connected to the base body. A hollow profile is formed by at least the first and second casing portions. The position measuring device has a scale disposed within the hollow profile and a scanning unit for scanning the scale. The base body and the scale are directly connected to each other.

[0008] In particular, the scale is adjacent to the mounting surface of the base body. The mounting surface is the surface of the base body (e.g., machine bed) facing the scale, especially in the lateral direction.

[0009] Preferably, the base body and the first casing portion and / or the base body and the second casing portion are directly connected to each other.

[0010] It is advantageous if a hollow profile is formed by the base body, the first casing section, and the second casing section.

[0011] Furthermore, it is advantageous if the scanning unit is movable longitudinally relative to the hollow profile, preferably independently of the scale and / or independently of the first and second casing portions.

[0012] In this context, "independently movable" is understood to mean that the scanning unit is not guided by the scale or by the first and second casing sections (a so-called unguided system). Unguided systems can be used in ultra-precision machinery.

[0013] Preferably, the position measuring device has a coupling body for holding a scanning unit. The scanning unit includes, for example, a cable. The coupling body is particularly formed so that the cable can be introduced through at least a portion of the coupling body. Therefore, the coupling body includes a cable pass-through for the cable of the scanning unit.

[0014] The trainer preferably has an adapter piece for connecting the scanning unit to the trainer. The adapter piece allows the scanning unit to be aligned or adjusted relative to the scale. This adjustment or alignment can be performed in multiple degrees of freedom (e.g., spacing / parallelism, moiré angle, and / or height).

[0015] Claim 15 describes a component set for a position measuring device according to the present invention. The component set comprises a first casing portion connectable to a base body and a second casing portion connectable to a body. Furthermore, the component set has a connecting body for holding a scanning unit.

[0016] The present invention provides a scale formed by first and second casing components, achieving independence from the effects of a two-part casing (e.g., thermal expansion and / or vibration). On the other hand, this enables accurate positional measurement of the scale in the longitudinal direction. For this purpose, the scale is directly connected to the base body (e.g., machine bed) instead of a two-part casing. Therefore, the direct connection exists only between the scale and the base body. There is no direct connection between the scale and one or both of the two casing components. This avoids the reduction in positional measurement accuracy due to the aforementioned effects. In contrast to known prior art in which the scale is placed in a two-part casing and the unit consisting of the casing and scale is placed on or connected to the base body (e.g., machine bed), a simple and low-cost structure is achieved. This is made possible, in particular, by a simple and low-cost implementation of encapsulation. Furthermore, the present invention allows for the dismantling of the two-part casing independently of the scale, which is directly connected to the base body. As a result, changes in the positioning or alignment of the scale, and consequently, misalignment of the position measuring device, can be avoided. This is particularly advantageous when the position measuring device needs to be cleaned.

[0017] Advantageous developments of the present invention are found in the dependent claims.

[0018] Further details and advantages of the present invention will be explained on the basis of the following description of possible embodiments of the invention in conjunction with the figures.

Brief Description of the Drawings

[0019] [Figure 1] A perspective view of an exemplary position measuring device is shown. [Figure 2] A cross-sectional view of the position measuring device according to FIG. 1 is shown. [Figure 3a] A perspective view of the end side of the position measuring device according to FIG. 1 is shown. [Figure 3b] A perspective exploded view of the end side of the position measuring device according to FIG. 1 is shown. [Figure 4] A cross-sectional view of the end side of the position measuring device according to FIG. 1 in the region of the second (upper) sealing cord is shown. [Figure 5a] A perspective view of the trailing body of the position measuring device according to FIG. 1 is shown. [Figure 5b] A perspective view of the trailing body according to FIG. 5a with the closing element removed from the complementary part of the trailing body is shown. [Figure 6a] A plan view of the trailing body according to FIG. 5a for specifically showing the portion formed in an L-shape is shown. [Figure 6b] A cross-sectional view of the trailing body according to FIG. 5a in the central region of the trailing body is shown. [Figure 7] A perspective view of the closing element according to FIG. 5b is shown. [Figure 8] A perspective exploded view of the position measuring device according to FIG. 1 is shown.

Embodiments for Carrying Out the Invention

[0020] Identical elements or functionally identical elements are provided with the same reference signs in the figures.

[0021] The embodiment will be described below with reference to Figures 1 to 8. The position measuring device according to the embodiment comprises a base body 1 (e.g., a machine bed or the base body of a machine), a first casing portion 10.1 extending in the longitudinal direction X and connected to the base body 1, and a second casing portion 10.2 extending in the longitudinal direction X and connected to the base body 1 (see Figure 8). At least the first and second casing portions form a hollow profile (see Figure 2). This position measuring device has a scale 12 positioned inside the hollow profile 10 and a scanning unit 14 facing the scale 12 for scanning the scale 12. The base body 1 and the scale 12 are directly connected to each other.

[0022] As shown in Figure 2, the scale 12 is adjacent to the mounting surface 1.1 of the base body 1. The mounting surface 1.1 is the surface of the base body 1 that faces the scale 12.

[0023] The position measuring device is, in particular, a length measuring device. Therefore, the scale 12 and the scanning unit 14 are movable relative to each other in the longitudinal direction X (i.e., the measurement direction). During position measurement, the scanning unit 14 scans the measurement scale of the scale 12 and forms the position measurement from there. The measurement scale is not depicted in the figure.

[0024] The base body 1 and the first casing section 10.1 are directly connected to each other via fixing screws. One of these fixing screws (fixing screw 4.11) is visible in Figure 2. Furthermore, the base body 1 and the second casing section 10.2 are directly connected to each other via fixing screws 4.2. One of these fixing screws 4.2 (fixing screw 4.21) is visible in Figure 2. Fixing screw 4.21 is assigned to fixing screw 4.11, that is, fixing screws 4.11 and 4.21 are arranged to overlap in the Z direction. The Z direction extends parallel to the mounting surface 1.1 of the base body 1 and perpendicular to the longitudinal direction X. Hereafter, the Z direction will also be referred to as the "first direction".

[0025] To be directly connected to one another means that each element is directly connected to the others, that is, without one or more intermediate elements in between.

[0026] Referring to Figure 2, the hollow profile 10 is formed entirely by the base body 1, the first casing portion 10.1, and the second casing portion 10.2. The position measuring device has a first seal lip 18.1 and a second seal lip 18.2 (hereinafter referred to as seal lip 18) (extending in the longitudinal direction X). The seal lip 18 is located at the lower end of the hollow profile 10. The trainer 16 that holds the scanning unit 14 grips it through the space between the seal lips 18. Further details of the trainer 16 will be described later in relation to Figures 5 to 7 (or Figure 8).

[0027] As shown in Figure 2, the seal lips 18 face each other in the Y direction. The Y direction extends perpendicular to the mounting surface 1.1 of the base body 1. Hereafter, the Y direction will also be referred to as the "second direction".

[0028] With respect to Figure 2, the first casing portion 10.1 has a first part 10.11 for fixing the first casing portion 10.1 to the base body 1. Furthermore, the second casing portion 10.2 has a second part 10.21 facing the base body 1 for fixing the second casing portion 10.2 to the base body 1. The first part 10.11 is located on the first (lower) side of the scale 12. The second part 10.21 is located on the second (upper) side of the scale 12, facing the first side. The first part 10.11 and the second part 10.21 are located facing each other in the first direction (i.e., the Z direction). As shown in Figure 2, the fixing screw 4.11 extends through the first part 10.11. Furthermore, the fixing screw 4.21 extends through the second part 10.21. Therefore, the two-part casing formed by the first and second casing sections 10.1 and 10.2 extends on both sides of the scale 12 to the base body 1, surrounding the scale 12 on the upper and lower sides.

[0029] The position measuring device has first to fourth sealing elements 20.1 to 20.4 (see Figures 2 and 8). As shown in Figure 2, the first casing portion 10.1 has a first recess 11.1 adjacent to the base body 1 for accommodating the first sealing element 20.1. Furthermore, the second casing portion 10.2 has a second recess 11.2 adjacent to the base body 1 for accommodating the second sealing element 20.2. The first recess 11.1 and the second recess 11.2 each extend in the longitudinal direction X.

[0030] For example, the first sealing element 20.1 is a first sealing code. Furthermore, the second sealing element 20.2 is, for example, a second sealing code. The first sealing element 20.1 and the second sealing element 20.2 each extend in the longitudinal direction X. The first and second sealing elements 20.1 and 20.2 are each housed by first and second recesses 11.1 and 11.2 along their entire length.

[0031] The two-part casing formed by the first and second casing portions 10.1 and 10.2 can be sealed to the base body 1 in the lateral direction, i.e., in the Y direction, by the first and second sealing elements 20.1 and 20.2. This is shown in Figure 2.

[0032] This position measuring device has a first cover element 10.3 positioned at the first end portions A and A' of the first and second casing portions 10.1 and 10.2, and a second cover element 10.4 (see Figure 8) positioned at the second end portions B and B' of the first and second casing portions 10.1 and 10.2, facing the first end portions A and A'. As can be seen from Figure 8, a third seal element 20.3 is positioned between the first end portions A and A' and the first cover element 10.3. Furthermore, a fourth seal element 20.4 is positioned between the second end portions B and B' and the second cover element 10.4. In particular, the third seal element 20.3 and the fourth seal element 20.4 are each formed in a plate shape. Furthermore, Figure 8 shows that the first and second cover elements 10.3 and 10.4 can be connected to the base body 1 via fixing screws 4.41 and 4.42 (fixing screw 4.4), respectively.

[0033] The third sealing element 20.3 and the fourth sealing element 20.4 can also be called (compressible) sealing plates, respectively.

[0034] The first and second cover elements 10.3 and 10.4 represent the third and fourth casing sections (end casing sections), respectively. This is shown in Figure 1. The third and fourth sealing elements 20.3 and 20.4 allow the casing formed by the first to fourth casing sections 10.1 to 10.4 to be sealed at the end, i.e., at the first end sections A and A', or at the second end sections B and B'.

[0035] Figure 3a shows one end of the position measuring device according to Figure 1. In particular, Figure 3a shows the first end A' of the second casing portion 10.2 and the first cover element 10.3 (third casing portion). Figure 3b shows the third seal element 20.3 positioned between the second and third casing portions 10.2 and 10.3. The second and third seal elements 20.2 and 20.3 can be seen from the cross-sectional view in Figure 4. As shown in Figure 4, the second and third seal elements 20.2 and 20.3 are positioned coplanar with the mounting surface 1.1 of the base body 1. As a result, lateral sealing of the casing to the base body 1 is achieved. This is shown in Figure 4 for the end side shown in Figure 3a. This situation is similar to the opposing end sides of the position measuring device.

[0036] Referring to Figure 2, the first casing portion 10.1 has a third recess 11.3 for accommodating the first seal lip 18.1. Furthermore, the second casing portion 10.2 has a third portion 10.22 opposite to the base body 1. The first casing portion 10.1 and the third portion 10.22 are arranged opposite each other in the second direction (Y direction). As shown in Figure 2, the second casing portion 10.2 has a fourth recess 11.4 located in the third portion 10.22 for accommodating the second seal lip 18.2. The third recess 11.3 and the fourth recess 11.4 each extend in the longitudinal direction X. The first and second seal lips 18.1 and 18.2 are respectively accommodated by the third and fourth recesses 11.3 and 11.4 along their entire lengths. This seal lip 18 is used to seal the hollow profile 10 formed by the base body 1, the first casing portion 10.1, and the second casing portion 10.2 downward, i.e., in the (minus) Z direction (see Figure 2).

[0037] The seal lip 18 and the first to fourth seal elements 20.1 to 20.4 substantially achieve complete sealing of the position measuring device. Thus, the overall result is a system that is sealed against fluids (e.g., coolant / lubricant).

[0038] The position measuring device specifically represents an encapsulated and unguided system. In this case, the scanning unit 14 is movable relative to the hollow profile 10 in the longitudinal direction X, particularly independently of the scale 12 and independently of the first and second casing components 10.1 and 10.2 (see Figure 2). As shown in Figure 2, the scanning unit 14 does not have a common guide surface with the scale 12 or with the first and second casing components 10.1 and 10.2.

[0039] More detailed aspects of the connecting body 16 are described in Figures 5 to 7 (or Figure 8). According to Figure 8, the connecting body 16 has an assembly area 16.1. The assembly area 16.1 is used to connect the connecting body 16 to the object to be measured 2. As shown in Figure 8, the connecting body 16 can be connected to the object to be measured 2 via fixing screws 4.3. Furthermore, the connecting body 16 has a sword-shaped central piece 16.2, an adapter piece 16.3, and a closing element 16.4. The adapter piece 16.3 is used to connect the scanning unit 14 to the sword-shaped central piece 16.2. The adapter piece 16.3 allows the scanning unit 14 to be adjusted relative to the scale 12 in multiple degrees of freedom (e.g., degrees of freedom Y, RY, Z). The adapter piece 16.3 and the assembly area 16.1 are connected to each other by the sword-shaped central piece 16.2.

[0040] As shown in Figure 2, the sword-shaped central piece 16.2 extends from the inside of the hollow profile 10 through the seal lip 18 to the assembly area 16.1 located on the outside of the hollow profile 10. The scanning unit 14 includes a cable 14.1 (see Figure 8). The cable 14.1 has an upper portion 14.11 and a lower portion 14.12. The upper portion 14.11 extends from the scanning unit 14 to the sword-shaped central portion 16.2. The lower portion 14.12 extends out of the assembly area 16.1 in the longitudinal direction (X direction) (see Figures 2 and 8).

[0041] The guide body 16 is used in particular to hold the scanning unit 14. Referring to Figure 5a, the guide body 16 has an opening 17 for housing and guiding the cable 14.1 through it. The opening 17 extends through at least a portion of the guide body 16 (see Figure 6b). As a result, the cable 14.1 can be guided through at least a portion of the guide body 16, in particular the sword-shaped central portion 16.2.

[0042] Regarding the geometric shape of the connecting body 16, the longitudinal direction (X direction) corresponds to the direction extending parallel to the longitudinal extension of the connecting body 16. The first direction (Z direction) corresponds to the direction extending perpendicular to the base surface G of the connecting body 16. The second direction (Y direction) corresponds to the direction extending perpendicular to the longitudinal extension of the connecting body 16 and parallel to the base surface G of the connecting body 16.

[0043] Referring to Figures 5a and 6b, the connecting body 16 is formed such that the cable 14.1 can be guided in a first direction (Z direction) through the sword-shaped central portion 16.2. Furthermore, the connecting body 16 is formed such that the cable 14.1 can be guided in the longitudinal direction (X direction) through the assembly area 16.1 in the longitudinal portion L of the connecting body 16.

[0044] Referring to Figure 6a, the central portion 16.2 of the sword shape has a first extension L1 in a second direction (Y direction). For example, the first extension L1 is in the range of 1.0 to 1.5 times, or 1.0 to 1.25 times, the diameter D of the cable 14.1. Thus, the first extension L1 is larger than the diameter D of the cable 14.1, in particular slightly larger than the diameter D of the cable 14.1, or equal to the diameter D of the cable 14.1. Thus, the first extension L1 (i.e., the width of the central portion 16.2 of the sword shape) is adapted so that the cross section of the cable 14.1 can be accommodated by the central portion 16.2 of the sword shape.

[0045] Figure 5b shows that the connecting body 16 has a recess 16.4' provided in the longitudinal portion L of the connecting body 16 for fitting the cable 14.1 laterally into the connecting body 16. Referring to Figure 6a, the recess 16.4' has a first section 20.1 (elongated hole) including an opening 17 and a second section 20.2 adjacent to the first section 20.1. The first section 20.1 and the second section 20.2 form an L-shaped section 20 in a plan view of the connecting body 16. The first section 20.1 extends in the longitudinal direction (X direction). The second section 20.2 extends in the second direction (Y direction). The first section 20.1 is located within the central region Q of the connecting body 16. The second section 20.2 extends from the lateral surface 24 of the connecting body 16 to the central region Q of the connecting body 16.

[0046] Referring to Figure 6a, the first section 20.1 has a second extension L2 in the second direction (Y direction). Furthermore, the second section 20.2 has a third extension L3 in the longitudinal direction (X direction). For example, the second extension L2 and / or the third extension L3 are in the range of 1.0 to 1.25 times or 1.0 to 1.15 times the diameter D of the cable 14.1, respectively. Thus, the second and third extensions L2 and L3 are larger than the diameter D of the cable 14.1, in particular slightly larger than the diameter D of the cable 14.1, or equal to the diameter D of the cable 14.1, respectively. As a result, it becomes possible to fit the cable 14.1 laterally into the connecting body 16 via the L-shaped portion 20.

[0047] Referring to Figure 5b, the connecting body 16 includes a closing element 16.4 corresponding to a recess 16.4' (see also Figure 7). The closing element 16.4 is detachably connected to a complementary portion C of the connecting body 16. As shown in Figure 6b, the connecting body 16 has a first inner contour 17.1. Furthermore, the closing element 16.4 has a second inner contour 17.2 opposite to the first inner contour 17.1. The first inner contour 17.1 and the second inner contour 17.2 each extend through the longitudinal portion L of the connecting body 16. The first inner contour 17.1 and the second inner contour 17.2 form an opening 17 for accommodating and guiding the cable 14.1.

[0048] Figure 6b shows a cross-sectional plane S1 that extends parallel to the longitudinal extension of the connecting body 16 and perpendicular to the base surface G of the connecting body 16. In addition, the cross-sectional plane S1 extends through the cable 14.1 (or opening 17). For example, the opening 17 formed by the first and second inner contours 17.1, 17.2 has an arched or angled transition. According to Figure 6b, this transition basically has an L-shape.

[0049] In Figure 5b, the closing element 16.4 is shown in a detached state. The closing element 16.4 can be connected to a complementary part C of the connecting body 16 via a fixing screw 4.5.

[0050] Referring to Figure 5b, the recess 16.4' is formed so that the cable 14.1 can be fitted into the connecting body 16 in a second direction (Y direction) when the closing element 16.4 is detached from the complementary part C (i.e., detached).

[0051] The closing element 16.4 has a dual function. On the one hand, the closing element 16.4 is used to close the recess 16.4' (or the connecting body 16) after the cable 14.1 has been fitted laterally into the connecting body 16. On the other hand, the closing element 16.4 is formed to provide tension relief for the cable 14.1 when connected. In Figure 7, the inner wall of the closing element 16.4 (second inner contour 17.2) is clearly visible.

[0052] The opening 17 has, for example, a round, square, or rectangular cross-section. As can be seen from Figure 6b, the opening 17 has a fourth length L4 in plane S2. In this case, plane S2 extends parallel to the base plane G of the connecting body 16. For example, the fourth length L4 is in the range of 1.0 to 1.25 or 1.0 to 1.15 times the diameter D of the cable 14.1. Advantageously, the cross-section of the opening 17 is matched to the cross-section of the cable 14.1 (see Figure 6a).

[0053] Preferably, the fourth length L4 is in the range of 2 mm to 20 mm, or in the range of 5 mm to 15 mm.

[0054] The connecting body 16 is preferably part of the position measuring device described in Figures 1 to 8 (i.e., an encapsulated length measuring device having a two-part casing). Alternatively, the connecting body 16 is also suitable for use in an encapsulated length measuring device having a single casing.

[0055] The component set for the position measuring device described in Figures 1 to 8 comprises a first casing section 10.1 connectable to the base body 1 and a second casing section 10.2 connectable to the base body 1. Furthermore, the component set has a connecting body 16 for holding the scanning unit 14.

[0056] Furthermore, the parts set may include additional elements 10.1-10.4, 20.1-20.4, and 18 (the entire parts set). By assembling the parts set, an already available open-type length measuring system (i.e., a system without encapsulation) consisting of a scale 12 and a scanning unit 14 can be encapsulated.

[0057] The present invention has the following advantages in particular: The component set is suitable for optionally encapsulating an open-type length measuring system (general applicability). In this case, there is no need to change or redesign the assembly process or method of the open-type length measuring system (e.g., assembly of special cables). The simplified structure of the position measuring device reduces system costs. It allows for disassembly of the position measuring device casing (e.g., for cleaning) without readjusting the position measuring device.

[0058] The present invention is particularly advantageous in that the component set creates compatibility with all previously unencapsulated, open length measuring systems.

[0059] The present invention enables particularly high-resolution position measurement if the measuring scale is formed to be optically scannable. Alternatively, the measuring scale may be formed to be magnetically, inductively, or capacitively scannable. While this application relates to the invention described in the claims, it also includes the following other aspects. 1. Base body (1), and A first casing portion (10.1) extending in the longitudinal direction (X) and connected to the base body (1), and A position measuring device comprising a second casing portion (10.2) extending in the longitudinal direction (X) and connected to a base body (1), In a position measuring device having a hollow profile (10) formed by at least a first casing portion (10.1) and a second casing portion (10.2), and a position measuring device having a scale (12) positioned inside the hollow profile (10) and a scanning unit (14) for scanning the scale (12), A position measuring device characterized in that the base body (1) and the scale (12) are directly connected to each other. 2. The position measuring device according to claim 1, characterized in that the scale (12) is adjacent to the mounting surface (1.1) of the base body (1). 3. The position measuring device according to claim 1 or 2 above, characterized in that the base body (1) and the first casing portion (10.1) and / or the base body (1) and the second casing portion (10.2) are directly connected to each other. 4. A position measuring device according to any one of the above 1 to 3, characterized in that a hollow profile (10) is formed by a base body (1), a first casing portion (10.1), and a second casing portion (10.2). 5. The first casing portion (10.1) has a first portion (10.11) for fixing the first casing portion (10.1) to the base body (1), The second casing portion (10.2) has a second portion (10.21) facing the base body (1) for fixing the second casing portion (10.2) to the base body (1), The first part (10.11) is located on the first side of the scale (12), The second part (10.21) is located on the second side of the scale (12), opposite to the first side. The position measuring device according to any one of claims 1 to 4 above, characterized in that the first part (10.11) and the second part (10.21) are arranged opposite to each other in a first direction (Z) that extends parallel to the mounting surface (1.1) of the base body (1) and perpendicular to the longitudinal direction (X). 6. The position measuring device has at least a first sealing element (20.1) and a second sealing element (20.2), The first casing portion (10.1) has a first recess (11.1) adjacent to the base body (1) for housing the first sealing element (20.1), The second casing portion (10.2) has a second recess (11.2) adjacent to the base body (1) for housing a second sealing element (20.2), The position measuring device according to any one of claims 1 to 5, characterized in that the first recess (11.1) and the second recess (11.2) each extend in the longitudinal direction (X). 7. The first seal element (20.1) is the first seal code, The second seal element (20.2) is the second seal code, The position measuring device according to 6 above, characterized in that the first sealing element (20.1) and the second sealing element (20.2) each extend in the longitudinal direction (x). 8. The position measuring device has a first cover element (10.3) positioned at the first end portions (A, A') of the first and second casing portions (10.1, 10.2) and a second cover element (10.4) positioned at the second end portions (B, B') of the first and second casing portions (10.1, 10.2) opposite to the first end portions (A, A'), The position measuring device has a third sealing element (20.3) and a fourth sealing element (20.4), The third sealing element (20.3) is positioned between the first terminal portion (A, A') and the first cover element (10.3), The fourth seal element (20.4) is positioned between the second terminal portion (B, B') and the second cover element (10.4), The position measuring device according to any one of claims 1 to 7 above, characterized in that the third sealing element (20.3) and the fourth sealing element (20.4) are each formed in the shape of a plate. 9. The position measuring device has a guide body (16) for holding the scanning unit (14), The scanning unit (14) is equipped with a cable (14.1), The position measuring device according to any one of 1 to 8 above, characterized in that the guide body (16) is formed such that the cable (14.1) can be guided through at least a portion of the guide body (16). 10. The accompanying body (16) has a sword-shaped central part (16.2), The position measuring device according to claim 9, characterized in that the guide body (16) is formed to guide the cable (14.1) through the central portion (16.2) of the sword shape in a first direction (Z) that extends parallel to the mounting surface (1.1) of the base body (1) and perpendicular to the longitudinal direction (X). 11. The connecting body (16) has a recess (16.4') provided in the longitudinal portion (L) of the connecting body (16), The connecting body (16) has a closing element (16.4) that corresponds to the recess (16.4') and is detachably connected to a complementary part (C) of the connecting body (16), The connecting body (16) has a first inner contour (17.1), The closing element (16.4) has a second inner contour (17.2) opposite to the first inner contour (17.1), The first inner contour (17.1) and the second inner contour (17.2) form an opening (17) for accommodating and guiding the cable (14.1). The position measuring device according to 9 or 10, characterized in that the opening (17) extends through the longitudinal portion (L) of the connecting body (16). 12. The position measuring device according to claim 11, characterized in that the recess (16.4') is formed so that the cable (14.1) can be fitted laterally into the connecting body (16) when the closing element (16.4) is detached from the complementary part (C) of the connecting body (16). 13. The first casing portion (10.1) has a third recess (11.3) for accommodating the first seal lip (18.1), The second casing portion (10.2) has a third portion (10.22) opposite to the base body (1), The first casing portion (10.1) and the third portion (10.22) are arranged opposite to each other in a second direction (Y) that extends perpendicularly to the mounting surface (1.1) of the base body (1), and the second casing portion (10.2) has a fourth recess (11.4) located in the third portion (10.22) for housing the second seal lip (18.2). The position measuring device according to any one of 1 to 12 above, characterized in that the third recess (11.3) and the fourth recess (11.4) each extend in the longitudinal direction (X). 14. The position measuring device according to any one of claims 1 to 13, characterized in that the scanning unit (14) is movable relative to the hollow profile (10) in the longitudinal direction (X), preferably independently of the scale (12) and / or independently of the first and second casing portions (10.1, 10.2). 15. The parts set comprises a first casing section (10.1) connectable to a base section (1) and a second casing section (10.2) connectable to a base body (1). A component set for a position measuring device according to any one of 1 to 14, characterized in that the component set has a connecting body (16) for holding a scanning unit (14).

Claims

1. Base body (1), and A first casing portion (10.1) extending in the longitudinal direction (X) and connected to the base body (1), and A position measuring device comprising a second casing portion (10.2) extending in the longitudinal direction (X) and connected to a base body (1), A hollow profile (10) is formed by at least a first casing portion (10.1) and a second casing portion (10.2), and the position measuring device has a scale (12) positioned inside the hollow profile (10) and a scanning unit (14) for scanning the scale (12), The base body (1) and the scale (12) are directly connected to each other. The position measuring device has a guide body (16) for holding the scanning unit (14), The scanning unit (14) is equipped with a cable (14.1), The guide body (16) is formed such that the cable (14.1) can be guided through at least a portion of the guide body (16). In the position measuring device, The connecting body (16) has a recess (16.4') provided in the longitudinal portion (L) of the connecting body (16), The connecting body (16) has a closing element (16.4) that corresponds to a recess (16.4') and is detachably connected to a complementary part (C) of the connecting body (16), The connecting body (16) has a first inner contour (17.1), The closing element (16.4) has a second inner contour (17.2) that faces the first inner contour (17.1), The first inner contour (17.1) and the second inner contour (17.2) form an opening (17) for accommodating and guiding the cable (14.1). The opening (17) extends through the longitudinal portion (L) of the connecting body (16), A position measuring device characterized by the following features.

2. The position measuring device according to claim 1, characterized in that the scale (12) is adjacent to the mounting surface (1.1) of the base body (1).

3. The position measuring device according to claim 1 or 2, characterized in that the base body (1) and the first casing portion (10.1) and / or the base body (1) and the second casing portion (10.2) are directly connected to each other.

4. The position measuring device according to claim 1, characterized in that a hollow profile (10) is formed by a base body (1), a first casing portion (10.1), and a second casing portion (10.2).

5. The first casing portion (10.1) has a first portion (10.11) for fixing the first casing portion (10.1) to the base body (1), The second casing portion (10.2) has a second portion (10.21) facing the base body (1) for fixing the second casing portion (10.2) to the base body (1), The first part (10.11) is located on the first side of the scale (12), The second part (10.21) is located on the second side of the scale (12), opposite to the first side. The position measuring device according to claim 1, characterized in that the first part (10.11) and the second part (10.21) are arranged opposite to each other in a first direction (Z) that extends parallel to the mounting surface (1.1) of the base body (1) and perpendicular to the longitudinal direction (X).

6. The position measuring device has at least a first sealing element (20.1) and a second sealing element (20.2), The first casing portion (10.1) has a first recess (11.1) adjacent to the base body (1) for housing the first sealing element (20.1), The second casing portion (10.2) has a second recess (11.2) adjacent to the base body (1) for housing a second sealing element (20.2), The position measuring device according to claim 1, characterized in that the first recess (11.1) and the second recess (11.2) each extend in the longitudinal direction (X).

7. The first seal element (20.1) is the first seal code, The second seal element (20.2) is the second seal code, The position measuring device according to claim 6, characterized in that the first sealing element (20.1) and the second sealing element (20.2) each extend in the longitudinal direction (x).

8. The position measuring device has a first cover element (10.3) positioned at the first end portions (A, A') of the first and second casing portions (10.1, 10.2) and a second cover element (10.4) positioned at the second end portions (B, B') of the first and second casing portions (10.1, 10.2) opposite to the first end portions (A, A'). The position measuring device has a third sealing element (20.3) and a fourth sealing element (20.4), The third sealing element (20.3) is positioned between the first terminal portion (A, A') and the first cover element (10.3), The fourth sealing element (20.4) is positioned between the second terminal portion (B, B') and the second cover element (10.4), The position measuring device according to claim 1, characterized in that the third sealing element (20.3) and the fourth sealing element (20.4) are each formed in the shape of a plate.

9. The accompanying body (16) has a sword-shaped central part (16.2), The position measuring device according to claim 1, characterized in that the guide body (16) is formed to guide the cable (14.1) through the central portion (16.2) of the sword shape in a first direction (Z) that extends parallel to the mounting surface (1.1) of the base body (1) and perpendicular to the longitudinal direction (X).

10. The position measuring device according to claim 1, characterized in that the recess (16.4') is formed so that the cable (14.1) can be fitted laterally into the connecting body (16) when the closing element (16.4) is detached from the complementary part (C) of the connecting body (16).

11. The first casing portion (10.1) has a third recess (11.3) for accommodating the first seal lip (18.1), The second casing portion (10.2) has a third portion (10.22) opposite to the base body (1), The first casing portion (10.1) and the third portion (10.22) are arranged opposite to each other in a second direction (Y) that extends perpendicularly to the mounting surface (1.1) of the base body (1), and the second casing portion (10.2) has a fourth recess (11.4) located in the third portion (10.22) for housing the second seal lip (18.2). The position measuring device according to claim 1, characterized in that the third recess (11.3) and the fourth recess (11.4) each extend in the longitudinal direction (X).

12. The position measuring device according to claim 1, characterized in that the scanning unit (14) is movable relative to the hollow profile (10) in the longitudinal direction (X).

13. The parts set comprises a first casing section (10.1) connectable to a base section (1) and a second casing section (10.2) connectable to a base body (1). The parts set for a position measuring device according to claim 1 is characterized in that the parts set has a connecting body (16) for holding a scanning unit (14).

Images