DE202005005273U1 - Protection device e.g. protection window, has locking device with mechanical transmission unit that produces switching force on switching-latch and/or terminal switch to stop drive shaft rotation in lowering direction of surface units - Google Patents

Abstract

The device has surface units to cover an inlet opening (2) and a locking device activated by a connecting block (7). The locking device has an actuated mechanical transmission unit (8) which produces switching force on a switching-latch and/or a terminal switch by activation of the connecting block to stop rotation of a drive shaft in the lowering direction of the surface units.

Description

The The invention relates to a protective device with protective curtain and shutdown device, in particular protective window, in which a guide frame an access opening between a first room, in particular a workplace to be secured a person, and a second room, in particular the effective area a machine, free and wherein one or more surface elements the access opening cover or release and for that purpose in the framework between an upper opening limit and a lower opening limit guided are, further wherein a motor drive a motor, a drive shaft and driven upper rollers or wheels containing, over and over the lower Rollers or wheels at least one endless band-shaped one Element is guided, on the one or more surface elements are coupled, and wherein a locking device or the surface elements slows down and stops, when triggered by a safety edge.

at a protective window of this type (DE-A-38 27 909) are along the guide frame Racks rigidly fixed, which work together with pawls, which are attached to a protective screen as a movable surface element. Such protective screens are sometimes very bulky and heavy. The Must have latches very close to the racks, especially as they pass through the safety edge is triggered at the lower edge of the movable protective screen. The force of the moving mass of the protective disk is so from the pawls transferred to the racks and directly to the guide frame, what a lot of shaking leads and a strong noise emits. Overall, there is a considerable effort in the construction of the Protective window.

Of the Invention is based on the object with a protective device Switch-off device on protective curtains, in particular protective windows, to create, in which the total cost is reduced and the lock the protective curtain is cushioned.

The solution the task is given in claim 1. Further developments of the invention are in the dependent claims characterized.

in the Individual is a trigger transmission element provided, which when triggered the switching strip a switching force on a pawl and / or a motor brake switch causes the rotation of the drive shaft in the lowering direction of the surface or elements to stop, which make out the protective curtain. In the invention thus the drive shaft slowed down the protection process, be it a pawl-ratchet pairing, be it in addition or alternatively via an engine brake. Because the protective curtain on at least one endless band-shaped Element, preferably to two toothed belt, is coupled the protective curtain over the at least one band-shaped Element or the two toothed belts braked. As a result of elasticity of such ribbon-shaped Elements, the deceleration is not as noisy as in the case of the protective screen according to DE-A-38 27 909.

The Firing transmission element may include a rack which is limited to the guide frame displaced is mounted and with a protective curtain attached to the pawl works together, whose position depends on the position of the safety edge relative to the protective curtain. When the safety edge encounters a resistance, its position changes relatively to the protective curtain, the latch attached to the protective curtain falls into the Rack and guide for their displacement and for switching off the drive of the protective curtain.

The Firing transmission element can also be a longitudinal element such as wire, rope, ribbon, timing belt or chain, that over a Spring is tensioned and at least one switching cam for actuating the Motor brake switch carries. One on the surface element attached plucking device is capable of operating the safety edge the longitudinal member to cling to and pull at it to talk about the Switch cam a shutdown of the drive motor and switching to effect the brake.

The Firing transmission element may also be formed as a barrier comprising a beam, the triggering the safety edge is interrupted. This will be an electrical signal fires the above a switching element actuates the pawl and / or the brake switch, which for braking and locking the surface elements leads, which the access opening cover or release. The beam barrier is advantageous as Photocell is formed, whose light beam is along the edge the access opening between the guide frame and the surface elements extends.

A advantageous embodiment of the protective window provides, the transparent Elements of the window using adhesive strips on the window frame to glue and two mutually parallel plate edges also with screws or the like to fix on the frame to be secured against impact. At least the lower screwless edge of the window will be advantageous encapsulated by an H-profile.

With protective curtains it sometimes comes to Violent loads on the sheet-like elements, which thereby bend, whereby the risk of slipping out of the guides. arises. The guides of the protective curtain therefore receive means for tensile load transfer, which brace against bending of the surface or elements. These tensile load transmitting means may have simple interlocking hook-like profiles.

The Invention is based on embodiments described. Showing:

1 a schematic vertical section through a protective window,

2 a view of the protective window,

3 a schematic sectional view III-III in 2 .

4 an enlarged view of a corner region of the window,

5 a section along the line V-V in 4 .

6 a section along the line VI-VI in 2 .

7 a first variant of a release force transmission element, and

8th a second variant of the trigger transmission element and

9 a third variant of the trigger transmission element.

As in 1 shown, gives a guide frame 1 an access opening 2 between a workplace 3 a person and a sphere of action 4 a machine free. In the leadership frame 1 is a protective window 5 led to the access opening 2 to release or close. The shift of the protective window 5 via a drive 6 , At the bottom of the protective window 5 there is a safety edge 7 , which has a triggering force switching element 8th the downward movement of the protective window 5 can finish as soon as the safety edge 7 meets resistance. This happens at the latest when hitting the lower opening limit 9 ,

With reference to 2 includes the drive 6 an engine 10 , which is preferably designed as a brake motor and a drive shaft 11 drives at the upper spar of the frame 1 is stored. With the wave 11 are upper gears 12 rotatably connected, to which lower rollers 13 correspond to the frame 1 are stored. About each pair of wheels 12 . 13 is each a timing belt 14 curious, each one a Antriebstrum 14a and a counterweight trump 14b forms ( 3 ). The window 5 is via a coupling member 15 on the strand 14a attached. On the way 14b sits a counterweight 16 for the window 5 ,

A locking device 20 is for braking and stopping the window 5 intended. The locking device 20 includes a ratchet wheel 21 that with the drive shaft 11 rotatably connected, a pawl 22 that with the ratchet wheel 21 works together, and the elongated trigger transmission element 8th that in the embodiment of 4 from a rope piece 23 and a rack 24 is formed. The trigger transmission element 8th extends along the frame 1 and is guided and stored with respect to the rack 24 on the frame along a short distance, as in 25 in 4 shown.

At the window 5 is another latch 26 pivotally mounted, according to a leaf spring 27 in her in 4 shown position after deflection is guided back.

The training of the safety edge 7 is from the 4 and 5 seen. On a carrier body 30 is a rubber buffer strip 31 attached and over handlebar lever 32 on an H-shaped profile 33 of the frame 34 of the window 5 hinged. The H-profile 33 is an aluminum extruded profile and also serves to encapsulate the slices 40 of the window 5 , The carrier body 30 also forms a guide for a slider 35 which also has a spring 36 on the carrier body 30 is tied up. Both the slider 35 as well as the latch 26 have co-operating inclined surfaces 35a . 26a on to the latch 26 engaged with the rack 24 bring to.

The pawl 22 ( 3 ) is on the frame 1 pivoted and supported by a return spring / rubber buffer 28 on the frame 1 from. The pawl 22 also operates a limit switch 29 that turns off the engine 10 and turning on the engine brake is used.

5 and 6 show the frame 34 of the window 5 of box-shaped profiles, preferably of steel because of their high breaking strength, whose surface is compatible with adhesive. At the side profiles of the window frame 34 is ever a leader 37 made of plastic. At the window frame 34 are two transparent plastic plates 40 by means of adhesive strips 41 fastened, which make the other use of rivets unnecessary and thus give a better look. A U-profile with hook training 38 is on the frame 1 for guiding the guide piece 37 intended. At the window 5 are hook-like profiles 39 by means of screws 42 be consolidates along two parallel edges of the plates 40 extend to give a better durability of the window. The profiles 39 engage in the hook-like formations of the profiles 38 one. The hook-like parts 38 . 39 form tensile load transfer means in the event that of space 4 from an effect on the window 5 takes place, resulting in sagging of the window and sliding out of the guide pieces 37 from the guides 38 could lead. Such a load of force occasionally occurs through machine parts, such as robot tongs and the like, and machining parts.

The operation of the shutdown device is as follows:
From the workplace 3 ( 1 ), the operator performs workpieces or directs tools in the effective range 4 rightly, passing through the open access opening 2 is gripped through. When the hands retreat, the window opens 5 lowered, causing the safety edge 7 on the lower opening limit 9 encounters. Shortly before, the downward movement of the protective window 5 stopped by not shown limit switch.

If a hand has not been withdrawn in time, the safety bar hits the hand. This will be the safety edge 7 relative to the window 5 raised ( 4 ), ie the handlebar lever 32 pivots in the indicated arrow direction P 32 relative to the window 5 , and the bevel 35a of the slider 35 abuts the beveled surface 26a the latch 26 , The handle 26 pivots against the force of the leaf spring 27 and reaches into the rack 24 a, causing the rack 24 is moved down and over the connecting cable 23 the pawl 22 in engagement with the ratchet wheel 21 brings ( 3 ). The pawl 22 Stands between its storage and the ratchet wheel 21 and transfers the braking forces to the frame 1 , The ratchet wheel 21 is rotatable with the shaft 11 connected so that it is braked in its rotation and stopped, whereby also the respective endless timing belt 14 stop. The window 5 , which tries to move further down, is via the respective coupling link 15 stopped.

In addition to the locking by the pawl 22 via the limit switch 29 also a shutdown of the drive motor 10 and taking effect of the associated engine brake. It is also possible only with the limit switch 29 to work, because even then a safe and cushioned braking of the window 5 takes place, since this over the coupling links 15 on the elastic toothed belt 14 hangs.

7 shows a second embodiment of the trigger transmission element 8th , This includes a longitudinal element 50 , which may be a wire, rope, ribbon, timing belt or chain, also two switching cams 51 and 52 and a tension spring 53 with which the longitudinal element 50 between two fixed points is stretched. The longitudinal element 50 extends along the guide frame along which the protective window 5 is guided. A guide bar 54 can guide the cams 51 . 52 and the spring 53 be used. The cam 51 is a limit switch 55 and the cam 52 a limit switch 56 assigned. The limit switch 55 is used to switch off the drive of the window 5 and for turning on a brake for the drive shaft of the window 5 , The desk 56 serves for rope rupture protection.

At the window 5 is in place of the ratchet lever 26 ( 4 ) a clamping lever 57 with clamp training 58 attached, with a stop 59 working together on the window frame 34 is attached so that the longitudinal element 50 between stop 59 and window frames 34 runs.

The clamping lever 57 with his clamp training 58 may include a clamping cam or clamp eccentric or be designed as such.

The safety edge 7 may have the same characteristics as 4 described.

The mode of action of the triggering switching element 8th to 7 is as follows:
Upon actuation of the safety edge 7 becomes the slider 35 shifted, causing the inclined surfaces 35a and 57a meet each other and the lever 57 with his clamp training 58 towards the longitudinal element 50 is shifted, whereby the longitudinal element 50 between terminal training 58 and abutments 59 is trapped. The down moving window 5 thus pulls on the longitudinal element 50 , causing the spring 53 is stretched and the switching cam 51 the limit switch 55 actuated. This leads to switching off the drive of the window and to slow down the window drive shaft.

The interaction between clamping training 58 , Abutment 59 and longitudinal element 50 can be characterized as a short-term pulling process, which is why the parts 57 . 58 . 59 can also be referred to as a picking device.

Should the longitudinal element 50 tear, then the second cam 52 Pulled upwards and in connection with the second limit switch 56 effective to the downward movement of the window 5 to stop. The limit switch 56 thus serves as an emergency switch.

8th shows a further embodiment of a plucking device on a longitudinal element 50 , Instead of clamping training 58 is a role 60 on the lever 57 rotatably mounted. The abutment gets through two roles 61 and 62 formed on a connecting strap 63 to the window frame 34 to sit.

When addressing the safety edge 7 becomes the lever 57 panned and the roll 60 Bends the longitudinal element locally to a small loop 64 in contact with the rollers 61 and 62 , The looping arises in the longitudinal element 50 a tensile force that causes the spring to stretch 53 leads. The switching cam 51 is moved down and presses the limit switch 55 with the consequence of the shutdown of the drive and its deceleration.

If the longitudinal element 50 should tear, pulls the spring 53 the switching cam 52 against the limit switch 56 and actuates this to shut off the drive and braking the window.

Instead of the switching cam 51 . 52 may also have other means of actuating the switches 55 . 56 be used. For example, a non-contact magnetic switch can be used.

9 shows an embodiment of the trigger-transmission element 8th as a light barrier 80 , The light barrier comprises a transmitter 81 and a receiver 82 between which a ray of light 83 runs. The transmitter 81 is in the upper region of the guide frame 1 at the edge of the access opening 2 attached and the receiver 82 at the lower opening limit 9 appropriate. The window 5 is formed as described above and includes the safety edge 7 , which is similarly formed as in

4 and 5 described. The slider 35 has an end 35b on that in the beam 83 dips when the safety edge 7 is triggered. This will make the light beam 83 interrupted, which causes one of the pawl 22 associated magnet is de-energized, causing the spring 28 ( 3 ) the pawl into engagement with the ratchet wheel 21 pivots to the drive shaft 11 decelerate. Additionally or alternatively, an unillustrated brake switch of the engine 10 operated, which turns on the braking device of the engine, similar to the brake switch 29 ( 3 ) respectively 55 ( 7 . 8th ).

As the light source for the barrier, a laser beam is preferred because it can be finely focused. Such a collimated laser beam may be slightly oblique to the lower end of the window 5 be directed, so that the beam on a trip area 35b of the slider 35 hits when the window of the lower opening limit 9 approaches. In this way, the deceleration of the engine 10 be initiated before the safety edge 7 on this opening limit 9 incident. In this arrangement of the beam 83 accordingly moves the triggering area 35b during the downward movement of the window 5 in the beam 83 into it, whereby one by suitable adjustment of the oblique position of the beam 83 the tripping distance to the lower opening limit 9 can adjust.

It is understood that when triggering the safety edge 7 by a hand not withdrawn in time the braking process starts earlier, because the slider 35 with his trigger tip 35b even further up in the access opening the beam 83 interrupts.

The Photocell does not need a separate transmitter and receiver to be. Sender and receiver can also be united with each other, which is especially true with laser beam sensors it is a possibility.

Instead of of photocells can Also other types of rays are used, for example an air jet.

The Invention may also be in a different environment than at a workplace be used, for example, on roller doors or other protective curtains.

Claims (22)

Protective device, in particular protective window, comprising: a guide frame ( 1 ), which has an access opening ( 2 ) between a first room ( 3 ) and a second room ( 4 ) releases; one or more surface elements ( 5 ), which the access opening ( 2 ), and for this purpose in the framework ( 1 ) between an upper opening limit and a lower opening limit ( 9 ) are guided; a motor drive ( 6 ), a motor ( 10 ), a drive shaft ( 11 ) and driven upper rollers or wheels ( 12 ), over and over lower rollers or wheels ( 13 ) at least one endless band-shaped element ( 14 ) is guided on which the one or more surface elements ( 5 ) are coupled; and a locking device ( 20 ), which, from a safety edge ( 7 ), the surface element (s) ( 5 ) slows down and stops; characterized by the following features: the locking device ( 20 ) comprises a trigger transmission element ( 8th ), which is triggered when the safety edge ( 7 ) a switching force on a pawl ( 22 ) and / or a brake switch ( 29 . 55 ) causes the rotation of the drive shaft ( 11 ) in the lowering direction of the surface or elements to stop. Protection device according to claim 1, characterized in that the drive shaft ( 11 ) rotatably with a ratchet wheel ( 21 ) connected to the pawl ( 22 ) working together on the frame ( 1 ) is supported. Protection device according to claim 1 or 2, characterized in that the endless belt-shaped element ( 14 ) represents a toothed belt with which the surface element or elements ( 5 ) via coupling members ( 15 ) are connected. Protection device according to one of claims 1 to 3, characterized in that the trigger transmission element ( 8th ) a rack ( 24 ) attached to the guide frame ( 1 ) and with one on the surface element ( 5 ) attached latch ( 26 ) whose position depends on the position of the safety edge ( 7 ) relative to the surface element ( 5 ) depends. Protection device according to claim 4, characterized in that the safety edge ( 7 ) on the surface element ( 5 ) via handlebar lever ( 32 ) is hinged and a slider ( 35 ) with beveled surface ( 35a ), which with the attached to the surface element pawl ( 26 ) works together to put these into the rack ( 24 to come up with). Protection device according to claim 1, characterized in that the triggering transmission element ( 8th ) a longitudinal element ( 50 ), a feather ( 53 ) for tensioning the longitudinal element and means ( 51 ) for actuating the brake switch ( 55 ) and with a plucking device ( 58 . 59 ; 60 . 61 . 62 ), which, when actuated by the safety edge ( 7 ) a tensile force on the longitudinal element ( 50 ) is applied to the actuating means ( 51 ) of the brake switch ( 55 ) to activate. Protection device according to claim 6, characterized in that second means ( 52 ) for actuating a second brake switch ( 56 ) are provided, which when tearing the longitudinal element ( 50 ) to activate the second brake switch ( 56 ) to activate. Protection device according to claim 6, 7, characterized in that the longitudinal element ( 50 ) comprises a wire, a rope, a flat band, a toothed belt or a chain. Protection device according to one of claims 6 to 8, characterized in that the plucking device ( 58 . 59 ) a clamping lever ( 57 . 58 ) and a counterhold ( 59 ), wherein the clamping lever ( 57 . 58 ) via a slider ( 35 ) of the safety edge ( 7 ) is operable. Protection device according to one of claims 6 to 8, characterized in that the plucking device ( 60 . 61 . 62 ) a deflection roller ( 60 ) for the longitudinal element ( 50 ) and counterhold rolls ( 61 . 62 ) to form a loop ( 64 ), wherein the deflection roller ( 60 ) via a slider ( 35 ) of the safety edge ( 7 ) is operable. Protection device according to claim 5, 9 or 10, characterized in that the slide ( 35 ) along the safety edge ( 7 ), transversely to the direction of movement of the surface or elements, slidably guided and via a spring ( 36 ) is yielding. Protective device according to one of claims 1 to 5, characterized in that the pawl mounted on the frame ( 22 ) a motor switch ( 29 ) in order, in the event of a ratchet ( 22 ) the engine ( 10 ) of the drive ( 6 ) off. Protection device according to claim 12, characterized in that the engine ( 10 ) has a motor brake, which is effective when the engine is off. Protection device according to one of claims 1 to 13, characterized in that the guides of the surface element or elements ( 5 ) Medium ( 38 . 39 ) have to Zuglastübertragung, which against bending of the surface or elements ( 5 ) to stem. Protective device according to Claim 14, characterized in that the tension-transmitting means ( 38 . 39 ) comprise interlocking, hook-like profiles. Protection device according to one of claims 1 to 15, characterized in that the surface elements ( 5 ), in particular transparent plates ( 40 ) by means of adhesive strips ( 41 ) and screws ( 42 ) or the like on a frame ( 34 ), the screws ( 42 ) along two mutually parallel edges of the plates ( 40 ) are arranged. Protection device according to claim 16, characterized in that the frame ( 34 ) is constructed of box-shaped profiles made of steel. Protection device according to claim 16 or 17, characterized in that along at least the lower screw-free plate edge an H-profile ( 33 ) extending the respective plate edge against the frame ( 34 ) pinches and capsules. Protection device according to claim 1, characterized in that the triggering transmission element ( 8th ) a beam barrier ( 80 ) in the path of movement of the safety edge ( 7 ) arranged so is that when the safety edge ( 7 ) the beam ( 83 ) of the beam barrier ( 80 ), whereby the beam barrier ( 80 ) generates an electrical signal, which via a switching element, the pawl ( 22 ) and / or the brake switch of the engine is actuated. Protection device according to claim 19, characterized in that the beam barrier ( 80 ) as a light barrier with a light beam ( 83 ) formed between guide frame ( 1 ) and surface elements ( 5 ) along the edge of the access opening ( 2 ). Protection device according to claim 19 or 20, characterized in that the safety edge ( 7 ) a slider ( 35 ) with tripping area ( 35b ), which when triggering the safety edge ( 7 ) in the way of the beam ( 83 ) of the beam barrier ( 80 ) and interrupts this. Protection device according to claim 20 and 21, characterized in that the light beam ( 83 ) slightly obliquely on the edge of the surface elements ( 5 ) and thereby to the triggering area ( 35b ), when the safety edge ( 7 ) of the lower opening limit ( 9 ) of the access opening ( 2 ) approximates.