DE6606947U - DEVICE FOR SANDING ESPECIALLY PAINTED METAL SURFACES - Google Patents

Description

Dofmler-Benz Akrlengejel! Shank Palm 7607/4

Stuttgart-UntertUrkho in February 1968

March 13, 1968

Patent and utility model auxiliary registration:

DEVICE FOR SANDING ESPECIALLY PAINTED SHEET METAL SURFACES

The invention relates to a device for grinding particularly painted sheet metal surfaces with grinding shoes that work in opposite directions and that are placed on their against the surface of the jaw facing surface are covered with sandpaper and mounted on a common frame.

Painted sheet metal surfaces are still sanded by hand. One helps oneself mostly orbital sander that are driven electrically or with compressed air. There will be too large and only slightly curved surfaces, such as the roof, cW trunk lid and the engine hatch as well as the side walls sanded by hand. With previous grinding, the grinding pressure must not be too great, otherwise there will be dents on the sheet metal »A little less The grinding pressure also means that the grinding performance is low. It is therefore still failed to grind vehicles as quickly as for a conveyor belt, for example would be necessary.

The object of the invention is to provide a device with which ground so quickly as this is necessary e.g. for a belt production in which the grinding performance is high and the sheet metal is still not dented in any way.

According to the invention, this problem is solved by doing electro "

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magnets are provided. As a result, the contact pressure can be increased considerably without putting any strain on the metal sheet in the sense of denting.

It is known per se to equip manually operated grinding devices with magnets in order to prevent symptoms of fatigue in the arms when working overhead. Here the grinder is attached to the sheet metal, so to speak, so it reduces the contact pressure and loads the sheet metal.

The features of claim 2 ensure that the sandpaper adapts to smaller unevenness and a more uniform cursive pressure is achieved.

The features of claim 3 ensure that only the magnetic attraction determines the contact pressure without being subjected to serious restrictions in the construction of the device with regard to the weight of the individual parts.

By Merkmaie dos claim 4 one achieves that the slippers are also larger Curvatures of the sheet metal surface can adapt.

Due to the features of claim 5 you get a particularly simple and precise one Leadership of this kind.

Through the features of claim 6 one orrolcht that the tilting movements take place freely can, on the other Selto jodoch dor frame retains a defined logo.

Due to the features of claim 7, you can otn © especially etnfocho and controllable Device for the elngangg φφφΛτΑ OojvIci ^ t »koR) ponsatlon.

'' February 19 &

Due to the features of claim 8 mart / that the sanding belt supply is not achieved must take part in rapid movements of the sanding shoes and that this has to be compensated Weight remains relatively low. The aforementioned larger distance allows the sandpaper on the one hand can be held taut on the sanding shoe, but that the sanding belt feeder remains unaffected by the movements of the sanding shoes.

The features of claim 9 automatically ensure that the sanding belt is lowered Position remains loose and thus filters out the oscillating movements of the sanding shoes, while it is taut in the lifted state of the squinting shoes, so that the grinding belt around a defined lengthwise further can be remported.

The features provide a particularly advantageous embodiment in the sense just mentioned of claim 10.

The features of claim 11 enable problem-free and instantaneous transport In the lifted state of the sanding shoes.

The features dos claim 12 prevent the grinding belt when grinding relative to Schlolfschuh can move or one of the RoIton can unintentionally unroll or unwind.

With the feature ο of claim 13 one achieves a locking of a band-shaped Sandpaper * will be sanded and a release button will transport the sandpaper shall be.

Due to the features of claim 14, automatic actuation of the clamping devices is achieved to the guideline ^ g ^ gjQT ^ ty <ι Π ΙΟ τη

February l ^d o8

The features of claim 15 simplify the lifting and lowering kinematics considerably and the device, attached to the drive head, can be made as a structural unit in any number of ways Use angular positions from vertical to horizontal. Nevertheless, the AnpreSdrv ^ k is independent of any weights always the same, since it is only affected by the magnetic field of the Electromagnet is determined.

The features of claim 16 achieve a unit-compatible drive that however, any necessary tilting movements of the sanding shoes must not interfere.

By the features of claim 17 one achieves that the grinding shoes in such a Can be brought to a position in which the belt-shaped sandpaper is on its onward transport does not have to use.

The features of claim 18 mean that the centering device is relatively cheap is, since the mechanical centering, which is more expensive in terms of manufacture, only requires fine centering Must take over.

The MerküKifö dos claim 19 makes it practical for rough centering no additional effort is necessary.

By the features of claim 20 one achieves that the fine centering operation only then comes into contact with the frame when this is actually necessary. In the rest Tent she is separated from Him and froi from tremors.

660694710.1Z70

Due to the feature of claim 21, a particularly fine centering is achieved.

Dis-ch the features of claim 22 one achieves a cooperation of the devices, as is necessary e.g. for sanding painted sheet metal surfaces of automobiles.

Further advantages and features of the invention emerge from the following description

of a preferred embodiment shown in the drawing:

Fig. 1 is a perspective, partially open and broken away representation of a

device according to the invention in the lowered state,

Fig. 2 is a simplified section along the line 2-2 in Rg. 1, partially in the abge

raised and partially lowered, Fig. 3 is a section along the UnIe 3-3, once the lifted and once the

showing lowered state,

4 shows a perspective top view syif a © coarse centering device, Fig. 5 is a front view of a gate-shaped support frame with several devices

units according to the invention and a body to be ground, 6 shows a section along the line 6-6 in FIG. 5.

An electric motor 12 is flanged to a drive head 11 as shown in FIG Belt 13 drives a drive shaft 14 which is rotatable in a bearing 16 in drive head 11 is stored. An electromagnet 18 is located below a Peckolplatto 17 of the drive head 11 fastened by means not shown and has legs 19 together with a spool · 21. on the drive shaft 14 is seated in the height of the electromagnet 18 an armature 22 torsionally rigid Drive shaft 14. At the lower end of the drive shaft 141st a first universal joint 23 is provided.

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seen, doe is connected to a two-tone universal joint 26 via a second drive shaft 24. This goes into a double-cranked crank 27. The Kurboi is mounted on one side on a bridge 28 of a frame 29, which here comprises longitudinal and transverse shanks. The longitudinal legs extend in the direction of the arrows 31. The longitudinal legs each have a groove 33 on opposite sides in the Schlelfschuho 34 ^ _n J 35 i _n Di ^ Lty ^ g A ₅ with the help of a spring 32. pf _e ti _s 31 Κίη-ΐίϊκί moveable guided * are-. To Wn y "4 motion they are connected 27 by means of pins 37 and connecting rods 38 and 39 constitute Kurboi. A lifting device for the sanding shoes 34, 36 essentially comprises the following parts:

Four lifting and lowering cylinders 42 are provided on the base plate 41 of the drive head 11, doren piston rods 43 are attached to a support plate 44 and with the help of which one in the Is able to move the carrier plate 44 up and down parallel to itself.

The carrier plate 44 is traversed by two pistons 46 and 47. From their lower end occur two piston rods 48 and 49, which with the help of ball joints 51, 52 on the Bridge 28 are attached. For the sake of clarity, these pistons 46, 47, the piston rods 48, 49 and also the ball joints 51 and 52 in FIG. 3 are omitted.

With the help of the pistons 46, 47 such an upwardly directed tensile force is generated in the piston rods 48, 49 with which one is able to add a part, namely the greater part, of the weight of the grinding shoes 34, 36 and the frame 29 compensate. This tensile force can or the like by springs or controllable by compressed air. be generated. This tensile force acts not only in the lifted state of the sanding shoes 34, 36, which the Flg. 1 shows, but rather in the lowered state.

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In addition, guide cylinders 53 and 54 also traverse the carrier plate 44. For the sake of clarity, these guide cylinders 53, 54 are shown in FIG. 1 has not been drawn and only in Fig. 2 visible. Guide rods 56, 57 are guided up and down in the guide rails 53, 54. At its upper end, they carry a stop 58 and 59, respectively, located in the abgosonkten state (left half of Fig. 2) is a span I of the upper end face of the guide cylinder j _53/54 removed. At the lower end of the guide rods 56, cupel pons 61, 62 are provided, which are traversed by a head bolt 63 or 64, which is rigidly attached to the frame 29. The headed bolt 64 is shorter than the headed bolt 63, which means that the Schlolfschuh © 34, 36 can bounce around. In such Kippbewegungon the traversed by the head bolts 64 ball of the ball joint 62 does not move axially, while the ball 61 on the saddle Kugelgolenks ^r t of the head bolt 63 to move axially. Despite a very oxakton guide, tilting movements are possible.

In addition to the lifting and lowering device described up to now, a key bond feed device is provided. For this purpose, two roll holders 66 are provided on one side of the carrier plate 44 and two roll holders 67, 68 on the opposite side. Supply rollers 69 for grinding belts 71, 72 are provided on the roller holder 66 , while the rollers carry £ ?, i & winder rollers 73, 74. The course of an abrasive belt, for example the abrasive belt 71, is now shown on the basis of FIG. 3 described.

From the feed roll 69 *, the sanding belt 71 goes through a first clamping device 76, a slot 77 in the carrier plate 44, a second clamping device 78 under the sanding shoe 36, which is covered on its underside with a rubber layer 79 (st. Sanding belt 71 sprinkled on both sides with it guide rails 81 and 82 are provided on the lower edges of each sanding shoe.

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¹ on the other side of Schblfschuhs 36 of the second Kleiranvorrichtung is a third clamping device 83 is provided accordingly. From there, the sanding belt 71 rises, goes through trampoline rollers 84 and 86, passes through a fourth clamping device 87 and is taken up by the take-up roller 74.

The mode of operation of the first clamping device 76 and of the second clamping device 78 described. The third clamping device 83 and 87 is corresponding built up.

The first clamping device 76 comprises a U-shaped bracket 88, the two legs of which are attached to the support plate 44 with the end face downward. A second U-bracket 91 is hinged to the legs at 89 so that it can be swiveled. On this U-bracket hi approximately below the transverse web of bracket 88, a cylinder 92 is attached non-rotatably. Springs 93 try to pull the U-bracket 91, which according to FIG. 1 is cranked in order to push its pivot point 89 upwards so that the cylinder 92 rests on the crosspiece of the bracket 88. An abrasive belt 71 lying approximately between the cylinder 92 and the transverse web of the bracket 88 is thus clamped in place. This clamping is canceled when the carrier _plate% according to the left half of Figure 3 is 44 above, whereby the transverse web of the U-folds! S of the lifting and Senkzy! Indian 42 reaches 91 against a stop 95 and the U-bracket 91 pivoted clockwise about pivot point 89.

The second clamping device 78 comprises two longitudinal webs 94 and 96 through two angle pieces 97 and 98 are rigidly connected to one another and pivotable about a pivot point 99 »Ind. A spring, not shown, generates a bias, so that the Löngfeieg 94 in a

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V-shaped groove 101 of the abrasive piece 36 is pressed. Is located between the groove 101 and the L ^ ngssteg 94 on the grinding belt 71, "o * is held and there.

The second clamping device 78 is opened when the carrier plate 44 is in your upper position, for this purpose it is provided that on the base plate 41 four cylinder parallelo Rods 102, 103, 104 and 106 are itarr attached. There are also four Lefthuisen 107, 108 109 and 111 rigidly attached to the carrier plate 44. They are each supported by one of the poles 102, 103, 104 and 106 traverses the cutting edges 112, 113, 114 and at their lower ends 116 days. These cutters work together with centering pieces 117, 118, 119 and 121, which are rigidly attached to the shoes 34, 36.

So that the drive shaft 24 has sufficient room to move, the carrier plate 44 has a hole 122. An air motor YOir is provided in the roll holder * 67, 68 to drive the take-up rolls 73, 74. Electromagnets 124 are provided in the grinding shoes 34, 36 and are cooled by water, which can be used for rinsing during wet grinding.

To explain a work cycle, it is assumed that a lacquered sheet 123 has just been sanded to a matt finish and that the sanding belts 71, 72 are now to be transported a little further.

In the lowered state, the device has a position like that of FIG. 2 on the left and the Fig. 3 show right. Between the feed rollers 69 or the take-up rollers 73, 74 on the one hand and the sanding shoes 34, 36 on the other hand, the sanding belts 71, 72 make a looser one Ribbon. By appropriate control of the lifting and lowering cylinders 42, the piston rods 43 retracted and the carrier plate 44 moves sFc'n against the drive head ϊ ϊ. Demit also move the guide cylinder 53 and 54 upwards, while initially the

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Guide rods 56 and 57 and thus the sliding shoes 34, 36 remain in their lower position. When the carrier plate 44 has returned the distance I, the stops 58, 59 strike against the upper end faces of the guide cylinders 53 and 54 and from this moment on are mitgenonwien together with the guide rods 56, 57 at the top. The frame 29 and the grinding shoes 34, 36 are therefore also taken upwards. The grinding belts 71, 72 tighten continuously.

During this upward movement, current is applied to the coil 21, so that the armature 22 is drawn into the position shown in FIG. 4. This means that the crank 27 assumes a position in which the cutting edges 112, 113, 114 and 116 are approximately aligned with the centering pieces 117, 118, 119, 121. When the flex motor 12 is switched off, d? <3 grinding shoes 34, 36 yes any position that does not necessarily have to coincide with the centering position. On the last part of the route, the cutting edges 112, 113, 114 and 116 get into the V-shaped cutouts of the centering pieces 117, 118, 119, 121 and bring the grinding shoes 34, 36 completely into a position in which the squint straps 71, 72 are not wounded.

At the end of Aufwärtsbowegung the stops 95 troffon to the U-ßügel 91 and opening all of the first clamping means 76 and all the fourth clamping means 87. At the same time meet the cutting edges 112, 113, 114, 116 to the Löngsstego 94 and öffnon dio second clamps 78 and Third clamping devices 83. The Schlelfbünder 71, 72 are now taut and you can now move them a very long way in the direction of arrow 126.

If one now lowers the carrier plate 44 again, the clamping devices 76, 78, 83 and 87 are closed again. First, the Schlelfschuho 34, 36 hit the sheet again

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123 on. From this moment on, the carrier plate 44 still moves the distance I downwards and the loops are formed again in the grinding belts 71, 72. The electric motor 12 can be switched on again. During the take-off and the lowering, the Electromagnet 124 turned off.

With a grain size of 360-320, a contact pressure of

2
P = 80 p / cm and a ship speed of V = 0.75 m / sec.

FIGS. 5 and 6 show how the device according to the invention is used as a unit can. Because of the multiple guidance of the entire lifting and lowering device, the Units can also be operated in a horizontal position. For grinding a body 127 they are placed on a conveyor belt 128 and allowed to run through a gate-shaped support frame. On this two parallel spindles 131 are attached and a motor with the help of Chains 133, 134 and chain lifter can be turned to the left or right, so that spindle nuts 137 can move up and down as indicated by arrows 138. On the spindle nuts 137 is a Cross member 139 rigidly attached, which serves as a guide for a rail 141 on the three according to the invention Devices 142 are secured together. These can be moved back and forth on the cross member 139 according to the arrow 143 with the aid of a drive 144. It depends on a bonnet 146, a roof 147 or a trunk lid is to be sanded, the Adjusting spindle nuts 137 higher or lower.

So two movements are superimposed here during grinding, namely the oscillating movements of the grinding shoes 34, 36 according to the arrows 31 with a movement according to the arrows 143. As can be seen particularly clearly from Fig. 6, the devices 142 are slightly inclined, so that the grinding marks, which in total result in a zigzag path, overlap.

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Guide rails 148 are attached to the right and left of the uprights of the support frame 129, on which further devices 149 according to the invention can be moved up and down according to the arrows 151 are led. These up and down movements are made similar by actuators 152 generated by the drive 144.

As shown in particular in FIG. 5, the sanding pads can easily be in required Way to adapt the curvatures of the car roof or the side walls of the body.

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Claims (23)

Daimler-Benz Aktiengesellschaft Darm 760774 Stuttgart-Üntertürkheim February 1968 1. A device laughing iechoberf for grinding, in particular painted B, are equipped with counter-rotating Schleifsehuhen, the strung on their against the B iechoberf klche directed ¹ ^ iSgHe with abrasive paper and on a common frame supported, characterized in that daüi fair shoes in Sch (34 , 36) Electromagnes (124) are provided. 2. Apparatus according to claim 1, characterized in that an elastic layer (79) lies between the electromagnets (124) and the sandpaper (71, 72). 3. Apparatus according to claim 1 or 2, characterized in that a lifting and lowering device is provided, the lifting force of which in the lowered state of the sanding shoes is of the order of magnitude of the weight of the parts to be lifted such as shelf shoes (34, 36), guide frame (29), etc. . 4. Device according to one or more of the preceding claims, characterized in that that the lifting and lowering device with a tilting motion dor slippers (34, 36) golfing device enabling around two axes (51, 52, 61, 62) connected is. 5. Apparatus according to claim 4, characterized in that the joint device (51, 52, 61, 62) approximately perpendicular to the sheet metal surface (123) movable guide rods 66069A7 10.1Z70 -2- · ■ '::. . "..". "* :." .Dqfm 7607/4 J f j February 1963 (56, 57} , the lower ends of which are connected via ball joints (61, 62) with a guide frame (29) for the Schieffechube (34, 36). 6. Device according to one or more of the preceding claims, characterized in that cn of the lifting and lowering device guide rods (56, 57) are provided, the ball joints (61, 62) each in the middle of two opposite = superior longitudinal sides of the are FUhrungsrahntens (29), that the ball joints (61, 62) are traversed by a respective bolt (63, 64), en: itanr on the FUhnmgirahmcsn (29) is fixed and that dos a ball joint (62) on which a bolt { 64) axially immovable, but the ordere ball joint (61) is axially movable on the other bolt (63) « 7. The device or one or more of the preceding claims, characterized in that the lifting and lowering device has two cylinders, the piston rods (56) are articulated on the Fuhrurvjsrohmen (29) and their tensile force corresponds in order of magnitude to the weight of the parts to be lifted. 8. Device after one or more of the previous ones! Claims, characterized dodurch, Doss a Schleifbandzufuhrvosrrlchtung for endless abrasive belt (71, 72) is provided, ^c separated from the; hlelfschuhen (34, 36) are arranged and that between the sliding shoes (34, 36) and the Schleffbandzufuhivorricntung oin larger distance . 9. Device according to claim 8, characterized dodurch that the SchlelfDandzufuhrvorrichtung above the Schlelfscfwhe (34, 36) secured to a support plate (44) 1st and derf dio carrier plate (44) gröibret span (I) can be lowered 1st than the abrasive shoes ^ 34, 36) _Λ «« « _Λ . _n 660694710.1Z70 - 3 - ₍ - ':. ■ ..:: UoIm 7607/4 February 1968 10. Apparatus according to claim 8 or 9, characterized in that the guide rods (56, 57) in the carrier plate (44) are guided up and down and that their axial play in the siphon line is equal to the path piece (I). 11. The device according to claim 8 or 9, characterized in that the Schfeifbandzufuhrvorrlchtung elno Abwlcko! Roll (69) and a winding roller (73, 74) for each Schlolfschuh (34, 36) and that the winding roller (73, 74) continuously Drive, such as by ctnon Lyfrmotor. 12 «Device according to Etnom or Mohroren according to the preceding claims, characterized thereby | shows that on the carrier plate (44) for the sanding belt (71, 72) and to {each output winding or unwinding roller blind (69, 73, 74) has a first clamping device (76, 78) on | the Schleffschuhon (34, 36) second clamping devices (83, 87) are provided, | 13. The apparatus according to claim 12, characterized in that the first and second | li clamping devices (76, 78, 83, 87) With the sanding shoes (34, | 36) are open and closed when lowered. j 14. Apparatus according to claim 13, characterized in that dl © first and second clamping devices (76, 78, 83, 87) in the lifted state on first and second device-fixed stops (95, 112, 113, 114, 116) cnstoen and thereby are open. 15. The device according to one or more of the preceding claims, characterized in that the carrier plate (44) hangs on a lifting and lowering cylinder (42) on a Anlrleb * - head (11). 4 -,. ' P alm 76Ü7- / 4 February 1968 A device according to another odor mohroron dor the preceding claims, characterized in that from the drive head (11) one is provided with two cardan guides (23, 26) Drive shaft (14, 24) to the Schlolfechuhe (34, 36) through the support plate (44) leads through it and is rotatably mounted at its lower end in the guide frame (29) and that its lower end has a double cranked crank (27), dio on the one Ends of two connecting rods (38, 39) are mounted, the other end of which on the grinding { shoes (34, 36) are stored. 17. Device according to one or more of the preceding claims, characterized in that that a centering device for the sanding shoe (34, 36) is provided with the help of which | e an unwinding and winding roller (69, 73, 74) the sanding belt (71, 72) and the associated sanding shoe (34, 36) are brought into alignment. 18. Device according to one or more of the preceding claims, characterized in that a coarse centering device and a fine centering device are provided and that the coarse centering device is immovable via a drive head (11) Magnetic field acts on an armature (22) which sits firmly on the drive shaft (14, 24) while the fine centering device mechanically engages the guide rail (29), 19. The device still claim 18, daebreh characterized in that dos magnetic field in Stator of a DC-excited rotary rotor motor can be generated and that the armature is the rotor of the slip ring motor. 20. The device still claim 18, characterized in that the fine centering device preferably four poraileie rods attached to the drive head (11) 660694710.1Z70 tiaim 7607/4 February Ϊ (102, 103, 104, 106), the free ends of which in the lowered state of the walking shoes (34, 36) do not touch their guide frames (29) in the raised position but intervene positively in this. 21, device according to claim 18 or 20, characterized in that the fine centering is a cutting edge centering. 22. Device according to one or more of the preceding claims, characterized in that that several of them are attached to a gate frame (129) are attached to be movable back and forth, can be transported through the material to be ground (127) is. 23. Device according to one or more of the preceding claims, characterized by such an arrangement that the sanding shoes (34, 36 | have a smaller size when they move downwards towards the object to be sanded) Move away than the carrier plate (44), whereby the sandpaper (71) between the sanding shoe and the carrier plate loosens and an oscillating Movement (31) of the sliding shoes (34, 36) without tearing the sandpaper becomes possible.