DD153083A5 - PROTECTIVE DEVICE, ESPECIALLY FOR A TOOL MACHINE GUIDANCE RAIL - Google Patents

Abstract

The invention relates to a protective device, in particular for a machine tool Fuehrungsbahn, with at least one drum with bearing, a roll-up on the drum, roller blind-like, associated with a reciprocating slide cover and on the one hand at the drum bearing point and on the other hand on the drum While the object of the invention is to substantially increase the utility value properties, in particular the service life, of such protective devices at low production costs, the object is to improve protective devices, in particular for a machine tool guide track, such that the stroke length and the prestressing force be significantly increased and thus the machine tool can be driven in higher frequencies that a good seal is achieved and their space is low. According to the invention, the object is achieved in such a way that the drum bearing point is designed as a shaft mounted on the machine tool, and that the drive of the carriage is connected to the shaft.

Description

• · «* ... Berlin, the 21st 11 · 80

8 23 Q / 223 913 58 126 25

Protective device, in particular for a machine tool guide track.

Field of application of the invention .

The invention relates to a protective device, in particular for a machine tool guideway, with at least one drum with bearing point, a roll-up on the drum, roller blind-like, connected to a reciprocating slide cover and on the one hand to the drum bearing point and on the other the drum mounted torsion spring. ^.

Characteristic of the known technical solutions

Such protective devices are already known as prior art, which serve to cover vertical or horizontal guideways on machine tools against external influences and influences.

Here are basically three types of protection: Once the bellows, which has the disadvantage of a bad Abdickungswirkung and increased space requirements. Furthermore, the telescope cover, which also requires a lot of space, is expensive to manufacture and can only be used at low frequencies of the machine tool. Finally, there is the so-called roller blind cover. Here is the roilo-. wound up like a trained cover on a drum, said drum is under bias over a torsion spring «disadvantage here is the relatively short life of the roller blind-like cover, which in the Hin-

9 ς NnV. 1R BΠ * H iS 8 ίτί 24

&&& yi J 21. ii. so

B 23 Q / 223 913 58 126 25

and the movement of the associated carriage resulting in constant change of the tension on the torsion spring and the limited way, so that "the limited stroke length"

As prior art it has been proposed at a roll-up cover to arrange the springs on the side of the ends of the fixed shaft so that, if necessary, these springs can be replaced quickly (German Patent 1803449) "Even this way, however, results in the disadvantage that the tension of the torsion spring when moving the carriage is subject to constant changes and the weight limited Thus, the aforementioned disadvantages remain.

The aim of the invention is to substantially increase the utility value properties, in particular the service life, of protective devices for "guideways on machine tools at low manufacturing costs".

Task aer invention is to comparable protections, especially for a machine tool guide way to do so. improve that the stroke length and the biasing force are significantly increased and thus the machine tool can be driven in higher frequencies that a good seal is achieved and their space is low.

This object is achieved in that the Trommcllogerstelle as mounted on the machine tool

223 913 2i. ii. so

B 23 Q / 223 913 58 126 25

' '. ^; '' · - 3 -. ';';' /

Shaft is formed, and d.ass the drive of the carriage is connected to the shaft. This has the advantage that the torsion spring is moved by the amount of biasing force. The acting as a drum bearing shaft thus rotates with »This results in an extension of the life, an increase in the stroke length and it can be achieved an increase in the biasing force, so that the machine tool can be driven in higher frequencies,

Since, according to further features of the invention, the rotating drive shaft is mechanically, hydraulically or electrically connected to the drive of the carriage with respect to its drive, advantageously a large number of possible implementations result.

In a further embodiment of the invention can be arranged on both sides of the carriage per a drum designed as a shaft bearing, wherein the carriage drives the two shafts * This provides a perfect coverage of VVerkzeugmaschinen guideway achieved, both shafts to the respective amount of movement of the Turn the sled.

If a mechanical drive is used, advantageously, according to a further feature of the invention, the carriage can be connected to a toothed rack which meshes with a toothed wheel mounted on the shaft.

According to Giner other embodiment of the invention, the carriage may have two racks, which mesh with one attached to the shafton gear. There is also the possibility that the drive from runway and

21 .. 11. 80

B 23 Q / 223/913

58 126 25

Friction wheel is formed.

In a further embodiment of the invention, the carriage may also be connected to two toothed belts which mesh with one toothed belt wheel attached to the shaft. This also results in a simple manner of an operative connection between the shaft and the carriage.

According to another feature of the invention, the carriage can for example also be connected to a ball screw drive, the outputs of which are connected to two bevel gear drives, which drive the shafts of the drum bearing point.

According to another embodiment of the invention, it is also possible that the carriage is connected to a respective crank gear, which drives each one shaft of the drum bearing position «

Another mechanical connection results in that the slide and the two shafts are in operative connection with each other via a cross-grinding gear and two belt drives «

If a hydraulic connection is preferred, according to a further feature of the invention, the shaft can be connected to a hydraulic motor, which is connected to a hydraulic pump and to a drive motor for driving the carriage.

Another hydraulic drive form results according to

21. 11. 80

B 23 Q / 223 913

58 126 25

- 5 -

a further embodiment of the invention in that the carriage is connected with a piston-Zylirider unit which each have an adjustable hydraulic motor each. Shaft drives, wherein the two hydraulic motors are connected via a directional control valve and a variable displacement pump with a drive motor.

Another variant of a hydraulic drive is that the drive of the carriage via a hydraulic motor, which is connected to an adjustable hydraulic motor for the shafts, wherein the two hydraulic motors are connected via a directional control valve and a variable displacement pump with a drive motor.

If an electric drive is selected, in a further embodiment of the invention, the drive of the carriage via an electric motor, which is connected via a speedometer generator and a comparator and a servo motor with the waves »

According to another embodiment of the invention, the drive of the carriage may comprise a rack and a pinion, which is connected to a Ellipsenradpaar that drives via belt drives the waves.

It is also possible for a control template to control a heat button which is electrically connected to a comparator, the comparator being connected to the shafts via a servomotor.

The shaft forming the trojnrnagerstelle may be used for the purpose of

21. 11 * 80

B 23 Q / 223 913

58 126 25

tion of the rotation to be connected to a drive wheel. In this case, the diameter of the drive wheel either the same drum diameter for the cover,. Larger than the Drummeldurchrnesser or smaller than the drum diameter be formed, with the same diameter remains the bias of the torsion over the entire carriage path in about the same value »Is the diameter the drive wheel is smaller than the drum diameter, the preload decreases as the carriage path increases. "If, on the other hand, the diameter of the drive wheel is greater than the drum diameter for the cover, the preload increases as the slide path increases."

Execution example

| ιι # ιητΐΓΤίΐΓ · η rvnBiiir-iit-rtJim-rTTm »i * τ» tt-t rirViirrti- -inni

The invention will be described in more detail below in several embodiments with reference to the accompanying drawings.

Fig _o Ii is a front view of a provided with a roller-blind cover drum in the central section;

Fig _e 2 and 3: various possible embodiments of the protective device according to the invention in side view j

FIG. 4 a shows a further embodiment of the protective device in plan view; FIG.

^2U "· ⁸⁰

B 23 Q / 223 913 58 126 25

Fig. 5 to 7: three further embodiments of the invention - inventions geraäßen protection device with mechanical drive in side view;

8 shows an embodiment of the protective device according to the invention with electrical drive;

Fig 9 to Hi various embodiments of the invention

with hydraulic drive;

Fig. 12s is a side view of an embodiment of the

Invention with mechanical drive;

Fig * 13! a side view of an embodiment of the

Invention with mechnisch-elektric drive;

FIG. 14: diagrams for the representation of the pretension relative to the path of the carriage *

In Fig. 1, a drum 1 is shown * on which a roller blind-like cover 41 is wound. This drum 1 is mounted on a Vyelle 40, which forms the drum bearing Stelie »The shaft 40 stores in two bearings 42 _f which are connected to a not shown machine tool 43« This may for example be a grinding machine.

Furthermore, bearings 46; 47 provided; between the drum 1 and the shaft 40 is a torsion spring 34, which on the one hand to the drum 1 and on the other hand on the

21. 11. SO

B 23 Q / 223 913

58 126 25

- G

Shaft 40 is attached. The attachment is in this case so that a bias of this torsion spring is given «This bias is freely selectable according to the spring design and is defined by the degree of rotation of a drive wheel 2 or _{e of} the shaft 40 against engagement with the corresponding counter-elements. The shaft 40 is connected to the Drive gear Z either rotationally fixed or connected via a locking coupling ^

According to Fig. 2, this drive wheel 2 is formed as a toothed wheel, which meshes with a rack 3. "This rack 3 is connected to a driven carriage 4, for example a workpiece carriage, which reciprocates in the direction of arrow on the machine tool guideway 50, the on the machine bed 5 is present * The workpiece carriage 4 is in this case connected to a roller-type cover 41, which can be wound onto the drum 1 «

Moves now as a result of a non-illustrated drive the carriage 4 back and forth on the machine tool guide path 50 in the arrow direction, the roller blind-like cover 41 accordingly on the drum 1 or, unwound »During the movement of the carriage 4 moves accordingly also Rack 3 with and thereby rotates the gear 2, whereby the shaft 40 according to the movement of the carriage 4 also experiences a threat * The bias of the torsion spring 34 is thereby adapted to the movement of the carriage 4th For example, if the diameter of the drive wheel 2 equal to the diameter of the drum l _f so the bias remains constant over almost the entire stroke constant The torsion spring 34 thus undergoes a wecentliche extension of life ».

23 913 21. υ. 80

923 913

* · * · ** 'T B 23 Q / 223 913

58 126 25

  - '$$

Bel the embodiment of Figure 3, the carriage is on both sides, each with a cover 41. 41 * connected. Both covers are attached to the respective drum and can be turned on and off. The machine tool guideway 50 thereby provides a perfect cover against unwanted external influences and influences,

The carriage 4 is connected to the racks 3; 3 'connected, which with the corresponding formed as gears drive wheels 2; 2 * comb, whereby the respective shaft 40; 40 'is rotated according to the movement of the carriage 4 «

In the embodiment of Figure 4, the carriage 4 has two fastening tabs 8, each with a toothed belt 7; 7 'are connected. These timing belt 7; 7 ' mesh with a toothed belt wheel 6; 6 ', whereby the shaft-40'; 40 'and the drum by the movement of the carriage 4, the rotation with the prestressed torsion spring 34 experience. The degree of pretension or the change in the pretension can be accurately determined by the design of the toothed belt wheels 5 with respect to their diameter.

In the case of the embodiment shown in FIG. 5, the carriage is connected to a ball screw drive 30, which is placed in threat by a drive motor M. The two drives 45; 45 'are each with a bevel gear 31; 3: l ^l in connection, the output of this bevel gear 31; 31 'drives the waves 40; 40 "on" The two drums 1, 1 'get their drive on the slide, depending on

21 · 11 · 80

B 23 Q / 223 913

58 126 25

-10-

Design the prestressing of the respective torsion spring remains constant or can be interpreted as rising or falling "

Another possibility of a mechanical drive is shown in FIG. 6. The slide 4 is in this case connected to a respective crank mechanism 32, 32 '. 2 * and thus the shaft 40; 40 'drives «

In the Ausführungsbsicpiel of Fig. 7.-a cross-grinding gear 33 is used, which via a shaft a belt drive 132; 132 *, preferably a Zahnriernentrieb, drives, these two belt drives via output shafts, the shafts 40; Drive 40 'accordingly «

In Fig _e 8, an electrical embodiment of the present invention is shown. Here, a motor 12, preferably an electric motor, is provided, which drives the carriage 4 via a drive 13. "This motor 12 is electrically connected to a tacho-generator 20 and a comparator 25. Furthermore, there is a .electric connection to a servomotor 21; 21 * _t which are the waves 40; 40 * accordingly drive as a function of the movement of the carriage 4, This also makes the respective shaft 40; 40 ^s rotated according to the movement of the slide 4

9, a hydraulic drive is shown, wherein only a drum 1 and a cover 41 are connected to the carriage 4. In this embodiment, a motor 12 drives the carriage 4 via a drive 13,

21. 11. 80

B 23 Q / 223 913

58 126 25

- 11 -

This engine 12 is connected to a hydraulic pump 10 which communicates with a hydraulic motor 9. This hydraulic motor drives the shaft 40 in accordance with the movement of the carriage 4 *

Another embodiment of a hydraulic drive results according to Fig _e 10 "Here, a piston-cylinder unit 15 is provided for driving the carriage 4. This piston-cylinder unit 15 is hydraulically via lines, each with an adjustable hydraulic motor 14; 14 'in communication «Both hydraulic motors 14; 14 'drive the waves 40; 40 ^{# of} the drums 1; 1 'in accordance with the movement of the carriage 4 "continue to stand these adjustable Hyd-rauiikmotoren 14; 14 'via a directional control valve 16 and a variable displacement pump 18 with a drive motor M in combination «

• If the directional control valve 16 is displaced to the left, the area I of this valve comes into effect, whereby the hydraulic motor 14 'and the piston of the piston-cylinder unit 15 are acted upon by the front side of the drive motor M and the variable displacement pump 18, so that the carriage The pressure medium behind the piston flows back over the hydraulic motor 14. By switching the directional control valve 16 into the region II, a reversal takes place, as a result of which the slide 4 is moved to the left. By the two hydraulic motors 14; 14 'results in a relationship of this movement of Schlittens.4 with the rotation of the shafts 40; 40 ''

In the embodiment according to Fig * Il, the drive of the carriage 4 via a hydraulic motor 19, which with

»21st. 80

, B 23 Q / 223 913

58 126 25

- 12 -

each an adjustable hydraulic motor 14; 14 'communicates. Both hydraulic motors 14; 14 'are used to drive the shaft 40; 40 "" They are also connected via a directional control valve 16 and a variable displacement pump 18 to a drive motor M. "The operation of this directional control valve 16 is as in the embodiment of FIG * 10 _e

According to Fig _e 12, there is also the possibility that the carriage 4 is connected to a rack 26 which meshes with a gear 27 · The gear 27 cooperates with a Ellipsenradpaar 38, wherein the output of this Ellipsenradpaares via Riementrisbe 132; 132 'takes place, which in turn via waves, the waves 40; Turn 40 * correctly. _E

In the embodiment of FIG 13, a control template 23 is provided which cooperates with a probe 24 This probe 24 is electrically connected to a comparator 25, wherein the coil of the probe 24, the corresponding voltage to the comparator 25 passes, according to the position of the probe on the control cam of the control template 23c The drive of the carriage 4 via the motor 12 and the drive 13, here preferably a worm gear »The comparator 25 is electrically connected to servomotors 21; 21 'connected _e De according to how the control cam of the control template 23 is formed, the position control of the servomotors 21; 21 * are effected, these corresponding rotations of the shafts 40; 40 'be communicated _c

In Fig. 14, the relationship between the bias voltage V _o and the carriage path S is shown _Φ Boi the above-mentioned prior arti as he eroibt from the curve a _} is

21. 11. 80

B 23 Q / 223 913

58 126 25

- 13 -

it can be seen that as the carriage path S _{w increases,} the preload adversely changes greatly, ie. rises,.

If, according to the invention according to FIG. 1, a drive wheel 2 is used to drive the shaft 40, wherein the diameter of the drive wheel 2 is equal to the diameter of the drum 1, then a curve b, d results according to FIG. H. a nearly constant value over the entire stroke.

There is also the possibility that the diameter of the drive wheel 2 is smaller than the diameter of the drum 1. Then decreases with increasing carriage travel S, the bias voltage V, as shown in the curve c, s

If, on the other hand, the diameter of the drive wheel 2 is greater than the diameter of the drum 1, the result is an increase in the preload in accordance with the curve d as the carriage body S increases.

If, according to FIG. 13, a control cam of the control template or, according to FIG. 12, an elliptical gear, preferably an elliptical wheel pair 38, is used, then, for example, a curve e according to FIG. 14, d "h" a variable preload over the entire carriage path S, achieve"

All these embodiments have in common that the torsion spring is rotated in accordance with the movement of the carriage _e Here, the rotation of the shaft 40 can be either mechanically, hydraulically or pneumatically "The invention provides the advantage of a substantial Ver

21 «11. 80

B 23 Q / 223 913

 58,126 25

- 14 -

lengthening the life of the torsion spring, the possibility of increasing the stroke length and driving the machine tool in higher frequencies «,

Claims (3)

21. 11. 80 B 23 Q / 223 913 58 126 25 - 15 ε rf induη g sa nsρrυch I »Protection device, in particular for a machine tool = guideway, with at least one drum with bearing» a roll-up on the drum, roller blind-like, associated with a reciprocating slide cover and on the one hand to the drum bearing and on the other hand mounted on the drum torsion spring, characterized in that the drum bearing position is formed as a shaft (40, 40 ') mounted on the machine tool (43) and that the drive of the carriage (4) is connected to the shaft (40, 40') * 2. Protection device according to item 1, characterized in that on both sides of the carriage (4) each have a drum (1, 1 ') with a shaft (40; 4.0') formed bearing point is arranged, wherein the carriage (4) drives the two shafts , *. · · 3 "protection device even points 1 and 2, characterized in that the drive for the shaft is mechanical. 4 «Protection device according to the points 1 and 2, characterized in that the drive for the shaft is hydraulic. 5 _e protection device according to items 1 and 2, characterized in that the drive for the shaft is electric «. · · 6 _e Protection device according to points 1 and 3, gekennzoieh- = · 21. 11. 30 B 23 Q / 223 913 58 126 25 - 16 - in that the driven carriage (4) is connected to a toothed rack (3) which meshes with a drive wheel (2) fastened to the shaft (40). " 7 "protection device according to points 1 to 3, characterized in that the driven slide (4) is connected to two toothed racks (3; 3 ^l ) which are each provided with a drive wheel (2, 2) fixed to the shaft (40; ; 2 ') combing « 8 _e protective device according to item 3, characterized in that the mechanical drive consists of runway and friction wheel * 9 «Protective device according to the points 2 and 3, characterized in that the driven carriage (4) with two toothed belts (7, 7 ') is connected, which mesh with a toothed belt wheel fixed to the shaft. Protection device according to points 2 and 3, characterized in that the driven slide (4) is connected to a ball screw drive (30) whose output (45; 45 ') is in connection with two bevel gear drives (31; Zl') , which drive the shafts (40, 40 ') of the drum bearing A protective device according to points 2 and 3, characterized in that the driven carriage (4) is connected to a respective 'crank mechanism (32, 32') which drives one shaft each of the drum bearing point. ο r: \\ (\\ i -ι π : ο -, > .. <;> ν : \ > λ ι-I. '·. Vx ν '·· ί -' .- U '' ν .. · ι ι 13 i) .4, ¹ "3. 9 4 *% pi 11 Rn I * 3 £ ϋ · Xl. YOU B 23 Q / 223 913 58 126 25 - 17 - · Protection device according to points 2 and 3, characterized in that the driven slide (4) and the two shafts (40, 40 ') are in operative connection with each other via a cross-grinding gear (33) and two belt drives (132, 132'). , 13 ". Protective device according to points 1 and 4, characterized in that the shaft (40) is connected to a hydraulic motor (9) which is connected to a hydraulic pump (10) and a motor (12) for driving (13) the carriage (4). in contact « 14 "protection device according to the points 2 and 4, characterized in that the carriage (4) with a piston-cylinder unit (15) is connected, which via each adjustable hydraulic motor (14; 14 ') the respective shaft (40; 40 ') and that the two drives Hydrau ~ likmotoren (14; 14') via a directional valve (15) and a variable displacement pump (18) with a drive motor (M) in communication _e Protection device according to points 2 and 4, characterized in that the drive (13) of the carriage (4) takes place via a hydraulic motor (19) which is provided with an adjustable hydraulic motor (14, 14 ') for the shafts (40; 40 '), the two hydraulic motors (14, 14') being connected to a drive motor (M) via a directional control valve (16) and a variable displacement pump (18) * 16 * Protection device according to points 2 and 5, marked ^ '^ 21. 11 «80 B 23 Q / 223 913 58 126 25 -'If ¹ - 13 - net in that the drive of the carriage (4) via a motor (12), preferably an electric motor, takes place, which via a speedometer generator (20) and a comparator (25) and a respective servo motor (21; 21 ') the waves (40, 40 ') is connected _e 17 ", protection device according to the points 2 and 3, characterized in that the drive of the carriage (4) has a rack (26) and a gear (27), preferably in the form of a pinion, which is connected to a Ellipsenradpaar (38) that drives the shafts (40, 40 ') via belt drives (132; 132'} " 18o protection device according to points 2 and 5, characterized in that a control template (23) has a measuring • button (24) controls, which is electrically connected to a comparator (25) and that the comparator (25) via a respective servo motor (21; 21 ') with the "Vellen (40; / 40 ') is connected « Protective device according to one of the preceding points, characterized in that the shaft forming the drum bearing point (40, 40 ') is connected to a drive wheel (2) and a toothed belt wheel (6) « 20- _e protection device according to item 19, characterized in that "aer diameter of the drive wheel and of the toothed wheel (6) is equal to the drum diameter of the cover (41; 41 ') is at ₁₅ 21 * 'protection device according to item 19, characterized in that the diameter of the drive wheel is smaller than the ΐ 21. 11. 80 B 23 Q / 223 913 58 126 25 - 19 - Drum diameter for the cover is 22, protection device according to item IQ _1, characterized in that the diameter of the drive wheel is greater than the drum diameter for the cover. HierzuJ2-.Seten.Ze4