EP0003004A1 - Device for driving screws with washers - Google Patents

Abstract

With a device for screwing in screws with washers, the problem of the automatic feeding of the screws and the washers is to be solved. The screws are fed from a laterally arranged magazine (11) via a carrier strip and brought into the feed shaft by means of the grippers (24). A magazine (10) is also provided for the washers, these washers being fed through a slide which can be displaced or pivoted transversely to the screwing axis. The control of the washers feeding the washers and the grippers inserting the screws takes place depending on the feed movement of the screwing device, for which purpose various control rods (6, 7) and pins are provided, which are provided in grooves of rotating bodies or on pivotable levers Plant come. Due to the special course of the grooves and the design of the levers, a rotation or displacement movement of the required parts is achieved.

Description

The invention relates to a device for screwing in screws with washers, consisting of a feed shaft for the screws, an insertion path for the washers and a driven screwing device for gripping the screw head or for engagement therein.

A device for fastening panels made of insulating material has already become known (DE-OS 2631 841), in which tubes are provided for feeding the washers and the screws. A washer is first inserted into a channel, which leads to the underside of the device. Then a screw can be brought through a channel into a feed shaft, whereupon a screwing device is pressed down, which engages in the slot of the screw head. After each operation, a new set of washers and screws must be inserted manually. There is therefore a large and lengthy amount of work, so that a rational. Attachment of insulating panels, particularly on roofs, is not feasible.

When screwing panels of insulating material onto roofs, the screws cannot be provided with the corresponding washers from the outset, since these washers have a corresponding size, so that storage of the screws together with the washers is out of the question. Such washers have, for example External dimensions of 70 to 80 mm and must therefore be fed individually. Such large washers are required especially when attaching insulating plates, in order to be able to distribute the pressure created by the screw connection over a larger area of the insulating material.

The invention has for its object to provide a device of the type mentioned, with which the supply of screws and washers can be done without additional handles, so that the user of the device can concentrate on the attachment point and the actual screwing device.

According to the invention, this is achieved by a slide, slide or the like which is guided and / or pivoted approximately at right angles to the screw-in axis, for feeding washers from a magazine and by means of levers, grippers or which are pivotable and / or displaceable in a plane which is approximately at right angles to the screw-in axis. Like. For feeding the screws from a supply strip or magazine in the feed shaft, the carriage, slide, the lever, gripper or the like. Depending on the feed movement of the screwing device are movable.

By means of these measures according to the invention, washers are fed and the screws are pushed in during a feed movement of the screwing device via a slide, slide or the like, the screws then being able to be gripped immediately by the screwing device. These measures therefore ensure substantial radialization, which is particularly noticeable when covering large roofs. It can be created by the proposed type of actuation for the feed of the screws and the washers a relatively simple, but effective structure, which also ensures that an exact supply of the parts is guaranteed.

Further features according to the invention and special advantages are explained in more detail in the following description with reference to the drawings. 1 shows a side view of the device; Figure 2 is a screw and a washer in an oblique view. 3 shows a section of a roof with an insulating plate support in an oblique view; Figure 4 is a side view of part of the device with the cover plates removed; Figure 5 is an oblique view of a part of the device which triggers the movement of the various levers; 6 shows a section through the feed shaft with an actuating device for the same; 7 and 8 show the free end of the feed shaft in the two different end positions; 9 shows an oblique view of a rotating body, which 1 carries a gripper for inserting the screws, and FIG. 10 shows a detail of this rotating body; Figures 11 and 12 in side view the two different end positions of a feed lever and the feed shaft. 13 shows the entire feed device for the screws in an oblique view, and FIG. 14 shows this device schematically in a top view; 15 and 16 show two end positions of a lever for displacing a slide for the supply of the washers; 17 shows a section in the lower end region of the magazine; 18 shows an oblique view of the slide and part of the guide elements for the slide; 19 shows an embodiment variant of the slide in an oblique view; 20 shows an oblique view of a detail of the embodiment according to FIG. 19; 21 shows a schematic section through the variant according to FIGS. 19 and 20; 22 shows an embodiment similar to FIGS. 19 to 21; 23 is an oblique view of a feed channel of another embodiment; Fig. 24 schematically shows an embodiment of the supply of the screws for the feed shaft in plan view; 25 shows a schematically illustrated oblique view of a further embodiment of the device; 26 shows a plan view in partial section of a further embodiment of the device, the feed channel and the feed shaft, however, being shown only schematically; 27 and 28 different working positions of the gripper for feeding the screws; 29 is an oblique view of a carrier strip for the screws.

In Fig. 1 the device is shown with the housing closed. It can be seen that the device consists of a housing 1 accommodating the entire movement unit, the structure 2 and a mobile base 3. A drill 4, which is held in a support plate 5, serves as the drive for the screwing device, for example. The support for the feed is carried out by control rods 6 and 7, which also take on a management role. Arranged in the housing 1 is a slide which is displaceable at right angles to the screw-in axis and which is used to feed washers 8 from a magazine 10. Furthermore, pivotable and / or displaceable levers, grippers or the like are provided for feeding the screws 9 from a supply strip, the supply strip being inserted in a magazine 11, for example in the form of a pot, and being pulled off from there. The mobile pedestal 3 is provided with two pairs of wheels 12, one pair of wheels 12 being assigned a braking device 13 in the form of a brake lever. This braking device is effective shortly before the position in which the screw-in axis 14 is approximately perpendicular to the driving plane 5. When the device moves to the next fastening point, the entire device is pivoted about the axis 16 in the mobile base 3, the braking device 13 also being lifted off during this pivoting. This ensures that there is a secure hold at the place of use. The individual functions of the feed of the washers 8 and the screws 9 and the movement sequences are explained in more detail below.

2 and 3 that the washers 8 are kept relatively large in relation to the size of the screws 9, so that it is clear that storage of the screws together with the washers 8 is not possible and that a separate feed is required during screwing. Such screw connections are used, for example, where corrugated plates are placed on a substructure, which are then additionally provided by insulating plates 18 be covered. The insulating plates 18 must then be screwed through these and the corrugated plates 17 into the substructure. A large washer 8 is required to properly support the screw connection. 5, the control rods 6 and 7 can be seen in an oblique view, these control rods lying parallel to the direction of advance of the screwing device and carrying projecting control pins 19, 20 and 21 at their free ends, which to achieve an operative connection with the actuators for the slide, the lever grippers or the like. Instead of projecting control pins, of course, corresponding webs or grooves could also be provided, but the counterparts of the actuating members would then have to be redesigned accordingly. The control rods 6 and? are designed in the form of slidably held tubes, which in turn are guided on tubes 22 accommodated in the housing. The actuators for feeding the screws will now be explained in more detail: here essentially a feed lever 23, a holding gripper 24 and a gripper 25 are provided for feeding the screws 9 into the feed shaft. The gripper 25 for feeding the screws 9 into the feed shaft and the holding gripper 24 can be pivoted about axes 27 and 28 running parallel to the axis 14 of the screwing device, whereas the feed lever 23 can be pivoted about an axis 29 running approximately transversely to the screwing axis 14.

The feed lever 23 has an engagement arm 30, one of the boundaries 32 pointing in the feed direction 31 extends approximately at right angles to the feed direction 31 and the other limit 33 is bevelled at an acute angle. This ensures that the screws are securely grasped during feed, whereas when the feed lever is retrieved it is pushed backwards with the limitation 33 which is bevelled at an acute angle.

For this purpose, the feed lever 23 is held resiliently in the direction transverse to the feed plane of the screws 9. The feed lever 23 can be pivoted in a carrier 34 about the axis of the bolt 35, both on the feed lever 23 and on the support 34 project in the opposite direction, bolts 36 and 37, between which coil springs 38 are clamped. The bolts 35, 36 and 37 are arranged offset from one another so that the feed lever 23 is spring-loaded towards the front, that is to say with respect to FIGS. 11 and 12, from the plane of the drawing. As already stated, the carrier 34 of the feed lever 23 can be pivoted about the axis 29. The other end of the carrier 34 is provided with an elongated hole 39, in which a bolt 40 of a two-armed actuating lever 41 engages. This actuating lever 41 is operatively connected to the control pin 20 over the entire displacement length of the control rod 7. The guideway 43 for the control pin 20 is in the area of the arm 42 of the actuating lever 41 approximately axially parallel z4r control rod 7, so that there is no adjustment of the actuating lever 41 when moving the control rod 7 in the range up to the height of the axis of rotation 44 of the actuating lever 41. Only when the control rod .7 is guided downwards until the control pin 20 reaches the guideway 43 in the region of the arm 45 is the actuating lever 41 pivoted in the direction of the arrow 46. The arm 42 of the actuating lever 41 is thus pivoted in the opposite direction, so that the carrier 34 and thus the feed lever 23 are pivoted in the feed direction for the screws. When the control rod 7 is returned, the actuating lever 41 is returned from the position shown in FIG. 12 to the position shown in FIG. 11, the engagement arm 30 of the feed lever 23 then being withdrawn via the screw which has just been advanced. It has proven to be expedient if the guideway 43 is designed as a groove in the free end region of the arm 42 of the actuation lever 41, so that the control pin 20 fixes the actuation lever 41 in this region.

The holding gripper 24 can best be seen from FIGS. 13 and 14, this holding gripper being designed as a spring-loaded lever. The end limit 47 pointing in the feed direction of the holding gripper 24 is in turn aligned approximately at right angles to the feed plane of the screws and the other, ge opposite end boundary 48 runs at an acute angle to a boundary 47. This ensures a good hold of the screw that is advanced and also that the next screw that follows is not impeded by the inclined contact surface.

The gripper 25 provided for inserting the screws 9 into the feed shaft 26 has at least two insertion arms 49 and 50 which are arranged parallel and at a distance from one another and which grasp the screw just below the screw head and further down in its threaded area. The insertion arm 50 is extended downwards with a cover 51, so that, if necessary, longer screws can also be inserted into the feed shaft without interference. The insertion arms 49 and 50 engage in slots or above and below a guideway 52. This guideway 52 bridges the area between the feed plane of the screws and the feed shaft 26.

The special arrangement for pivoting the gripper 25 can be seen in FIGS. 9 and 10. The gripper 25 is arranged in a rotating body 53 which is rotatably axially parallel to the control rods 6, 7 and at least partially cylindrical in shape, this rotating body having grooves running in the longitudinal direction thereof. The groove 54 is continuous over the entire length of the rotating body 53 and the groove 55 only over part of the length thereof. The groove 55 is transferred into the groove 54 by arcuate sections 56. The control pin 19 of the control rod 6 shown in FIG. 9 engages in these grooves. At the upper crossing point of these two grooves 54 and 55, a deflecting body 58 is provided which closes the straight through groove 54. This deflector body 58 has an acute-angled bevel 60 at its area facing away from the deflector surface 59. This deflecting body 60 can be pivoted about an axis 61 arranged inside the rotating body 53. In addition, the deflector is resiliently held in its position shown in FIG. 9. On the basis of these measures, when the control rod 6 is depressed, the tax journal 19 initially guided in the groove 54 and directed into the groove 55 by the deflector 58. Since the control pin 19 executes a straight downward movement, the rotating body 53 must therefore rotate in the direction of the arrow 62, so that the gripper 25 grips a screw and brings it into the feed shaft. As soon as the control pin 19 reaches the lower crossing point 63 of the two grooves 55 and 54, the rotary body 53 is again pivoted back into its starting position. When the control rod 6 and thus the control pin 19 retract, the rotary body 53 and thus the gripper 25 remain in this position, since the control pin 19 is then returned via the straight groove 54. When the control pin 19 hits the bevel 60 of the deflector body 58, it is pressed in so that the control pin 19 can pass this obstacle on the way back. There is also no interference with the feed of further screws, since the gripper 25 remains in a rest position during the backward movement of the control members. An expedient embodiment of the deflector body 58 can be seen in FIG. 10, from which it can be seen that it is arranged on an arm 64 which is rotatably mounted about the axis 61 and on which a spring 65 engages. A stop lug 66 prevents the deflector body 58 from being pivoted too far outwards. The design of the feed shaft 26 can be seen from FIGS. 4.6 to 8 and partly from FIGS. 11 and 12. It can be seen that the feed shaft 26 and the screwing device, which consists of a screw spindle 67 and in the present case of a nut 68, are arranged coaxially. The screwing device can be adjusted in height within the feed shaft 26. The feed shaft 26 has a lateral insertion opening 69 approximately corresponding to the screw head and shaft, this insertion opening being designed so large that even longer screws can be screwed in with the same device.

Another essential feature is that the feed shaft 26 is adjustable in height and is held in an upper rest position by a coil spring 70: for displacement A two-armed lever 71 is provided in the feed shaft 26, an arm 72 of this lever having a longitudinal slot at its free end and gripping a bolt on the feed shaft 26. The other arm 75 has a runway 74 which is formed from two sections which essentially enclose an obtuse angle. As soon as the control pin 20 of the control rod 7 engages the lower section of the runway 74, the lever 71 is pivoted in the direction of arrow 77 and thus the feed shaft 26 is pushed down in the direction of arrow 78. The runway 74 of the two-armed lever 71 has several functional areas, one of which looks like a recess 76. The jaws 79 are first lowered so far that they are just locked. Then there is a head start and the jaws are moved further down and thus free. Now there is an area which causes the feed chute 26 to no longer be lowered further, although the nut of the screwing device is still on the way down and thereby spreads the jaws 79 apart. So that a safe return of the feed shaft 26 takes place as support for the spring 70, the upper portion of the runway 74 is arranged in its rest position approximately parallel to the screw-in axis, so that the lever is forcibly returned to this position when the control pin 20 is returned. It is also important in this context that the arm 75 having the runway 74 is only arranged in the last section of the movement range of the damper pin 20, so that the feed shaft 26 is not moved until the last movement section. This ensures, as will be explained in detail later, that the screws are guided in the free end of the feed shaft 26 until immediately before tightening. For this purpose, the free end of the feed shaft is tapered and is formed from two jaws which are resiliently movable relative to one another. Arranged on these jaws are a displacement direction of the same extending webs 80, which are supported on rollers 81 arranged to the side of the movement path of the feed shaft 26. At their area facing away from the end of the feed shaft 26, these webs 80 have an ab bevel 82 executed so that, as can be seen in FIG. 8, these jaws can move apart as soon as the straight section of the webs 80 has passed the rollers 81. The jaws 79 are then pressed apart by the subsequent screw head and the nut that grips the screw head, so that the screw connection can be completed. The jaws 79 are expediently connected to the tubular part of the feed shaft 26 via leaf springs 83. So that a correct insertion of the screw tip into the washer is possible, it is expedient if the feed shaft 26 or the jaws 79 arranged at the free end of the same reach close to the washers fed underneath. The advantage of the locked jaws 79, which follow the screw to be inserted, is that the screws are inevitably guided until the sheet is drilled. Then the jaws open, but the screw can no longer deflect. This is a good match for low density insulation materials as they have no guiding properties. Trapezoidal sheets with small V-shaped beads to accommodate bitumen in their crown can also be drilled securely. With short screws, the path from the time the plate is pressed out to the deep penetration is bridged by the insulation or until the sheet metal is drilled.

The displaceability of the slide for feeding the washers can best be seen in FIGS. 15 to 18. The carriage 84 is pushed back and forth between two end positions by means of a two-armed lever 85. One end position is below the stack of tlagazin for the washers 8 and the other end position below the feed shaft 26 for the screws 9. The end of one arm 86 engages the carriage 84 via a roller 87. The other arm 88 is operatively connected to the control pin 21 of the control rod 6. The construction of the lever 85 is such that this lever 85 is pivoted in the initial region of the movement of the control rod. This ensures that the slide is at the place of use together with the corresponding washer before the screw reaches the feed shaft 26. The one with the Control rod 6 or the control pin 21 cooperating arm 88 of the lever 85 has at its free end a groove 89 formed from two right-angled sections, at least the section pointing downwards in the direction of movement of the control rod 6 being open at the bottom and expanded at its end is. When the control rod 6 is moved downward, the lever 85 is pivoted in the direction of the arrow 90, the pin 21 reaching the downward-wiping section of the groove 89 when the slide reaches the end position and disengaging from the arm 88 there. The lever 85 is held in this position by springs 91. Only when the control rod 6 is returned does the control pin 21 again engage the groove 89, so that the arm 88 of the lever is raised again and the slide 84 is returned to the position below the magazine. From FIG. 18 and FIG. 4 it can be seen that the carriage 84 is held displaceably in guide strips 92 on the underside of the housing 1. The carriage 84 has an opening 93 corresponding to the size of the washer 8, spring-loaded, displaceable holding elements engaging in the edge region of this opening 93. In the embodiment according to FIG. 18, these are spring-loaded bolts with spike-like tips 94. The arrangement of these holding elements ensures that when the carriage 84 is pushed forward, the washers 8 cannot fall down and, moreover, this creates the possibility that the washers are so long in the carriage 84 until they are pressed down by the depression of the feed shaft 26 or the screw head. As a rule, the washer 8 is only lowered down onto the base to be screwed when the tip of the screw has already engaged in the base.

17 and 18 that the carriage 84 has groove-like depressions 95 and 96 on its upper side, into which projections 97 and 98 arranged below the magazine 10 engage when the carriage 84 is displaced. This ensures on the one hand that when ver push the carriage the next washer is lifted and not entrained, and on the other hand scih results in that the carriage can be easily returned without the bottom washer 8 of the stack being able to move and thus jam.

An entire movement sequence of the device according to the invention will now be explained below: The starting position of the individual parts is shown in FIGS. 4, 6, 11 and 15. When the screwing device is depressed, the control rods 6 and 7 are also pressed down, the control rod 6 with the control pin 21 first pivoting the lever 85 in the direction of the arrow 90 and thus a washer 8 by moving the slide 84 into the space below the feed shaft 26. When the control rods 6 and 7 are moved further, the control pin 21 then leads out of the groove 89, this lever 85 and thus the slide 84 being held in this position by the springs 91. During this feed movement, the control pin 19 of the control rod 6 was already guided in the groove 54 of the rotating body 53. This control pin 19 now arrives at the deflecting body 58 and thus the rotating body 53 inevitably rotates because the rotating body 53 has rotated by the distance between the two grooves 54 and 55. The control pin 19 is now guided further down in the groove 55. When rotating the rotating body 53, the gripper 25 comes into action, so that a screw 9 is inserted through the guide track 52 and the opening 69 into the feed shaft 26. After a corresponding distance of the further movement of the control rods 6 and 7, the control pin 19 at the intersection 63 of the two grooves 54 and 55 again in the groove 54, so that the rotating body 53 and thus the gripper 25 are pivoted back again. Only now, the guide pin 20 comes to the control rod 7 to the lower portion of the guide track 43 of the lever 41 is engaged so that a shift of the ^V orschubhebels carried 23rd As a result of this displacement, the next screw of a supply belt is pushed forward by one division, the spring-loaded holding gripper 24 being raised and then swiveling back again and the engages behind the advanced screw. In approximately the same position of the control pin 20, the arm 75 of the lever 71 is pivoted in the direction of arrow 77, so that the feed shaft 26 is guided downward in the direction of arrow 78. In the end position, the position of the parts then results as shown in FIGS. 8 and 12. The jaws 79 are then in the pivoted-apart position, since the screw head and the nut which grips the screw head are now passed through. Only now does the guide pin 20 of the control rod 7 engage with the lower section of the guideway 43 of the lever 41, so that the feed lever 23 is displaced. As a result of this displacement, the next screw of a supply belt is pushed forward by one division, the spring-loaded holding gripper 24 being raised and then swiveling back again and engaging behind the advanced screw. The strip feed should take place shortly before the end of the press-in process. This ensures that the strip is not transported further until the screw has been drilled and screwed in. Should from a Grande, z. B. due to a bad drill tip, the drilling process or the threading process is not carried out completely, the setting process can be stopped without a new transport step taking place.

When the entire screwing device is returned, the control pin 20 abuts on the guide track 43 of the lever 41, and the latter is returned to the rest position according to FIGS. 4 and 11, and in addition the lever 71 is forcibly swung back and thus the feed shaft 26 into the position according to FIG. 6 and Fig. 7 and 11 brought. The feed lever 23 thus springs back over the next screw and engages behind it again and is thus prepared for the next feed. The control pin 19 of the control rod 7 now slides back in the groove 54 and presses the deflector body 58 into the bevel 60 and can thus overcome this obstacle. The control pin 21 again moves upwards into the groove 89 so that the lever 85 is pivoted back against the direction of the arrow 90 and against the force of the spring 91. As a result, the carriage 34 is also returned to the starting position returned below the magazine 10, the next washer 8 engaging in the opening 93 of the carriage. This process can be repeated the next time the screwing device is pressed down. It can be seen from this that a quick and efficient operation is possible with the device according to the invention, so that the magazines only have to be refilled, for example, every hundred screw connections.

Instead of a slide 84, it would of course also be possible to provide a corresponding slide, which in each case brings a washer along a guide path into the space below the feed shaft. It would then have to be provided below the feed shaft 26 holding elements for the washers, which hold them until they are finally depressed, or a second, short, feed shaft fixed to the housing could be provided. As long as the slide 84 can be displaced above the uneven roof level, a kind of short feed shaft or a feed orientation can also be attached in the slide 84.

19 to 21 show a further exemplary embodiment of a device according to the invention, it being particularly worth mentioning that the feed shaft 26 is rigidly fastened, that is to say is not designed to be height-adjustable. For this purpose, the feed shaft 26 is brought close to the path of movement of a carriage 84, in which case the possibility must be created that the washer 8 is fixed in the material to be screwed until the screw is effectively tightened. The washer 8 must namely in this embodiment represent a guide for the screw inserted into the feed shaft 26. For this purpose, in the embodiment according to FIGS. 19 to 21, rotatably mounted bolts 99 are provided on two end faces of the opening 93 of the carriage 84, which have a flat 100 on one long side. In a certain position, in which the flats 100 run in an approximately vertical direction, the full opening cross section 93 of the slide 84 is released. The bolts 99 are held on spring-loaded levers 1C1 and are thus rotated into a position in which a cylindrical section of the bolts 99 projects into the opening 93. The washers 8 cannot fall down through the opening 93. In this embodiment, the levers 101 are actuated directly or indirectly by the control rods 6 or 7, so that when a force is exerted on the pin 102 in the direction of the arrow 103, the levers 101 are pivoted and the bolts 99 are thus rotated. At this moment, the washer 8 can also fall down. In a further embodiment according to FIG. 22, flaps are provided on two end faces of the opening 93 of the slide 84, which flaps are also actuated directly or indirectly by the control rods. Instead of flaps, sliding webs or the like can of course also be provided, since with such configurations there is only the requirement that retaining elements are present which narrow the opening 93 of the slide 84 in order to then release them in a corresponding position of the screwing device.

In an embodiment according to FIG. 19, in which a rigid arrangement of the feed chute 26 is provided, it would also be conceivable, as shown in FIG. 23, to design the guideway in a single piece with the feed chute 26. The arms of the gripper feeding the screws can then protrude into the slots 105.

An embodiment variant for feeding the screws into the feed shaft 26 can be seen in FIG. 24. The feed plane of the screws 9 leads here through the screw-in axis 14 so that the screws can be fed in this direction together with the magazine belt. For this purpose, two displaceable and pivotable grippers are provided, which are each equipped with a plurality of gripper teeth 108 and 109. These gripper teeth can be used alternately as feed and holding elements. In this embodiment, a laterally leading channel 110 is also provided, through which the screws are brought in de and holding magazine tape can be removed. The front gripper tooth 109 also serves to close the opening of the feed shaft. One of the main reasons for this variant is the saving of the gripper 25 with its cover 51 extended downwards. Its function should be taken over by the extension of the front part of the gripper tooth 109, which covers the insertion opening 69 of the feed shaft 26 entirely.

25 shows a further embodiment of the device according to the invention, only a single control rod 6 being provided here. The control pins 19 to 21 which perform the same functions are again provided with the same reference numbers here. In this embodiment, the carriage 84 is connected via a lever 111 to a rotating body 112 which is rotatably mounted about an axis 113 running parallel to the screwing device. In this embodiment as well, as already described for the rotating body 53 in FIG. 9, grooves 114 and 115 running parallel to one another are provided. In this embodiment, however, neither of the two grooves 114 and 115 is guided in a straight line over the entire height of the rotating body 112. It could be said here that the grooves 114 and 115 are guided parallel to one another over a central region and then overflow at the crossing point 116 and 117 into common end sections 118 and 119. These end sections 118 and 119 are arranged offset from one another, the end section 118 continuing the groove 115 and the end section 119 continuing the groove 114. In both grooves 114 and 115, deflector bodies 120 are provided which have a run-up edge 121 on one boundary and bevel 122 on their other boundary. The control pin 21 ′ engaging in these grooves or in the end sections thereof is designed to be spring-loaded, as can be seen in the drawing for FIG. 25. When the control rod 6 is depressed, the control pin 21 is initially located in the end section 118. As soon as the control pin 21 comes to rest on the leading edge 121, the rotating body 112 is rotated as a result of the oblique connection region to the groove 114. This rotation of the rotation body 112, the carriage 84 is pivoted in the direction of arrow 123 and thus brought from a position below the magazine for the washers to a position below the feed shaft. In the area of the deflector body 120 in the groove 114, the control pin 21 is pressed into its guide so that this area can be skipped. The control pin 21 then engages in the end section 119, so that the slide 84 is held in this position until the screwing process has ended. If the control rod 6 is then raised again, the deflecting body 120 causes the control pin 21 to again enter the groove 115, so that the rotating body 112 and thus the slide 84 are turned back. The control pin 21 then passes through the groove 115 and the deflector 120 into the upper end section 118, so that the end position is reached again.

An embodiment has been described here in which the carriage can be pivoted about an axis 113 running at right angles to a plane through the carriage 84. Of course, an embodiment would also be conceivable in which the carriage can be pivoted about an axis running parallel to the plane of the carriage, so that, for example, the washers could then be fed to the device in an approximately horizontal direction. The carriage 84 would then be in an approximately vertical position and in the other position in an approximately horizontal position.

For the rotating body 53, which was explained in more detail in FIG. 9, a control pin 19 is again provided, which can also be designed to be spring-loaded, in which case the deflecting bodies 58 according to FIG. 9 could also be rigid.

In the embodiment according to FIG. 25, the control pin 20 is also arranged on the control rod 6, so that all movements within the device can be carried out from a single control rod. The feed lever 23 is fundamentally different here from the embodiment described. It is only a matter of the axis 124 pivotable lever 23, which in turn has an engagement arm 30 at its free end. The engagement arm 30 is connected to the feed lever 23 via a leaf spring 125. The feed lever 23 has a lower extension 126, which lies in the range of motion of the control pin 20. As soon as the control pin 20 hits the extension 126, the feed lever 23 is pivoted in the direction of the arrow 127, so that the next screw is transported on. The feed lever 23 is held in a rear rest position by a spring 128. As soon as the control pin 20 is moved upwards by the control rod 6, the feed lever 23 again leads back to its starting position, the engagement arm 30 due to the mounting on a leaf spring 125 backwards, can swing away.

A further exemplary embodiment of the invention can be seen in FIGS. 26 to 28. Compared to the embodiment according to FIG. 25, the lever 111 and the slide 84 are designed here as a one-piece, flat plate 130. A central control rod 6 carries in a control head 131 a spring-loaded, axially displaceable control pin 132 which engages in the grooves 114 and 115 on the rotating body 112. Support plates 133 fastened within the device, which are arranged on both sides of a needle bearing 134, on the one hand ensure that the control rod 6 is secured against rotation and on the other hand that the forces occurring during the feed can be absorbed directly. The rotating body 112 is accommodated with the control rod 6 in a sealable partial area of the device. From this housing of the device, which is not shown for reasons of clarity, an extension 135 of the rotating body 112 emerges, which, for example, has a hexagonal shape as a driver. This extension 135 thus engages in the carriage 84 formed from a flat plate 130. In the driver area, a reinforcement 136 is flanged to the plate 130. When pivoting the rotating body 5, which in this embodiment practically has a T-shaped cross section, the carriage 84 transports a washer from position 137 to position 138, that is, below the feed shaft 26.

At a radial distance from the axis of rotation 139, a transmission lever 140 is pivotally attached to it. The other end of this transmission lever 140 is connected to a special embodiment of a lever or gripper 141 for feeding the screws into the feed shaft. As a result, actuation of the grippers for feeding the screws can be derived from the movement of the carriage 84. During the pivoting movement of the rotating body 112, the drive point 142 of the transmission lever 140 also rotates about the axis of rotation 139. This transmission lever 15 then engages with its other; End on a bolt 143 and is therefore pivotally connected to the gripper 141, this connection also taking place at a distance from the axis of rotation 144 of the gripper 141. A lever 145 is pivotally attached to the gripper 141, the pivot axis 146 of which is provided both at a distance from the pivot axis 144 of the gripper 141 and at a distance from the bolt 143. If the transmission lever 15 is displaced, the gripper 141 pivots with it until the lever 145 strikes the tubular feed shaft 26. The drive point 142 then still moves by a few angular degrees and the transmission rod held in a sleeve-like bearing piece 147 can then move against the bias of a compression spring 148. This ensures a clearance-free closure of the feed shaft 26 by the lever 145.

From the-Fig. 26 it can also be seen that the carriage 84 is provided with two notches 149, in which a notch engages, and additionally fixes the carriage 84 both in position 137 and in position 138 securely and without play. The recess 150 still visible in FIG. 26 serves in each case to receive a washer for transport.

27 and 28, the sequence of movements when feeding an atomizer into the feed shaft 26 will now be explained, the feed using the one shown in FIG Setup is done. The movement elements for the gripper 141, namely the transmission rod 140 and the rotating body 112 are omitted here for the sake of clarity.

27, the gripper 141 is shown in the initial position of the movement. The gripper 141, which is thus formed from an intermediate lever 151 and the lever 145, is held in this end position by the transmission lever 15. The lever 145, which is biased by a spring 152, strikes against a stop 153 fixed to the housing. If the intermediate lever 151 now pivots, the bevelled nose of the lever 145 moves almost linearly into the space between the first and the second screw 9. The first screw 9 is through a holder pawl 154 prevented from sliding back. This holding pawl 154 can be pivoted about the pin 155 and is always pressed against the stop 157 by the spring 156. The lever 145 is still outside of the double guide tracks 158 and 159, which are arranged at a distance of, for example, 40 mm.

In the position shown in FIG. 28 (fully extended position), the lever 145 is already in a position to rest behind the first screw 9. The nose 160 of the lever 145 thus engages the screw 9. During the further movement of the intermediate lever 151, the lever 145 comes to rest against the stop 161, so that the intermediate lever 151 and the lever 145 now form a rigid unit for the gripper 141. Therefore, the nose 160 of the lever 145 describes a circular path 162 up to the end position (shown in broken lines). In the meantime, the screw 9 has been removed from the carrier strip. The first screw 9 is now in the position 163 (shown in dashed lines) in the tubular feed shaft 26 fixed to the housing. The next screw 9 is pulled in front of the holding pawl 154. This holding pawl 154 can pivot back by the arrangement of the spring 156 when the screw 9 is skipped. When the intermediate lever 151 is pivoted back, the lever 145 strikes against the screw which is in front of the holding pawl 154 and swivels out under expansion of the spring 152 until the initial position according to FIG. 27 is reached again. Well, a new trans can start port process.

Since in such a design the feed of the washers takes place practically simultaneously with the advance of the screws, the screw must be prevented from falling in the premature case by a knob engaging in the feed shaft 26. This knob is designed, for example, to be resilient, so that this knob can be pushed back when the screw device is inserted at the head of the screw.

This special design according to FIGS. 26 to 28 enables both square washers for insulation fastening and narrow washers for fastening roof foils to be conveyed without any changeover work with one and the same rigid magazine shaft, these only being adapted to the shape of the recess 150 in the carriage 84 Need to become.

For illustration purposes, a carrier strip 170 with a few screws is shown in FIG. 29, from which it can be seen that the screws 9 are pulled off in the direction 171 of the tabs 172 holding them. The free ends of the slots separating the tabs 172 are expediently designed to be inclined in accordance with the last section of the feed channel to the feed shaft.

In the present invention, the screw feed is particularly advantageous. designed the screw feed to the device. The levers, engagement arms, etc. directly engage the screw shafts, so that no perforation on the carrier strip is required. There can also be no abrasion because the gripper is placed against the metal of the screws and not against the carrier strip of the screws.

It is also worth mentioning in this connection that the movable fastening of the levers could also be carried out by leaf spring joints, so that the axes of rotation formed by bolts would be eliminated.

So it would also be conceivable to forward the feed device for the screws directly on the side of the pot-shaped magazine, so that the screws can be removed from the magazine strip in a rolling process and the empty strip is returned to the pot-shaped magazine. Especially with heavier screws, which is also the case, for example, with screws of a certain length, it is advantageous if the magazine is equipped with a rotatably mounted base, so that the slight advance of the screws to the device is supported.

In the embodiment described, it was mentioned that the remaining stack of washers must be raised when the carriage is returned. There are various options here with which such lifting can be prevented. This is achieved, for example, by providing them with lateral recesses, in which case the successive washers are inserted offset by 90 degrees to one another and then only get into the slide by means of a displaceable grid. It would also be possible to arrange such incisions offset at the edge regions of the washers, successive washers having the incisions at different locations. Even then, a single washer could be fed to the carriage again by moving a grid or by pivoting such a grid. A further measure would be to have the carriage 84 rotate first, which of course only makes sense for square plates in order to subsequently carry out the linear movement. Only with these two methods can the bottom washer be removed from a stack without having to lift the stack of plates.

The carriage 84 could also be displaced in a different manner than by the lever 85. For example, a lever provided with a projecting arm could be rotated, this rotation being carried out in a manner similar to that of the rotating body 53 is.

Of course, further embodiment variants of the device according to the invention are also conceivable, but these are within the scope of the present invention. It would also be conceivable to assign an electronic crown finder to the mobile pedestal so that the screw is carried out in the region of an elevation of the corrugated plates 17. The corresponding display device can be attached at any point on the device. There is also the possibility of attaching mechanical orientation aids to the mobile pedestal 3 in order to determine the beads (crowns) of the corrugated sheets or to determine the screwing point.

The applicability of the device according to the invention is of course not limited to rectangular washers. On the contrary, circular or washers with a different shape can also be used. Such a device can also be used wherever screw connections with relatively large washers are to be carried out.

In addition to the different designs of the washers, there are also various ways of magazining these washers. The first of these possibilities is that the stack of washers is housed in a cardboard box in a known manner. In a second possibility, the washers are glued together with adhesive varnish to form a column, and in a third embodiment, a stack is z. B. summarized plastic tear tape. This entire stack is then inserted and the tape is pulled out of the middle of the stack. A predetermined breaking point breaks off, with a short remaining band falling down. The longer remaining strap with eyelet hangs on the finger.

Washers equipped with ribs are kept at a distance by suitable spacers so that the washers can slide from one another without resistance and can be separated like flat washers. The spacers can be flat sheets (corrugated cardboard) or gradually after breaking off the plastic edge or as a potting compound.

By applying a spring load to the stack of plates, a device such as that described can achieve complete position independence. The magazine 10 can be adapted by inserting different plate shapes.

Claims (22)

1.Device for screwing in screws with washers, consisting of a feed shaft for the screws, an insertion path for the washers and a driven screwing device for gripping or engaging the screw head, characterized by being displaceable approximately at right angles to the screwing axis (14) and / or swivel-guided slide (84), slider or the like for feeding washers (8) from a magazine (10) and by means of a lever (23) which can be swiveled and / or displaced in a plane approximately at right angles to the screw-in axis (14) ), Grippers (24, 25) or the like. For feeding the; Screws (9) from a supply strip or magazine (11) into the feed shaft (26), the slide (84), slide, the lever (23), gripper (24, 25) or the like depending on the feed movement the screwing device are movable. 2. Device according to claim 1, characterized in that parallel to the feed direction of the screwing device and together with this displaceable control rods (6, 7) are provided which have projecting control pins (19, 20, 21), webs, grooves or the like. For od achieve an operative connection with the actuating members for the carriage (84), the lever (23), the grippers (24, 25). the like. ^\ 3. Vorricntung according to claims 1 and 2, characterized in that the provided for inserting the screws (9) gripper (25) on an axially parallel to the control rods (6, 7) rotatably mounted, at least partially cylindrical rotating body (53) arranged This rotary body (53) has at least partially curved grooves (54, 55) arranged in its longitudinal direction for engaging a control pin (19) of a control rod (6). 4. The device according to claim 3, characterized in that the rotating body (53) has an axially parallel, straight groove (54) and a part of the length thereof parallel to this second groove (55), the ends of the second groove ( 55) merge into the first groove in an arc and at the upper crossing point (57) of the two grooves (54, 55) there is provided a deflecting body (58) which closes the rectilinear groove (54), the area of which facing away from the deflecting surface (59) has an acute-angled bevel (60) and which is resiliently retractable in the groove (54) (Fig. 9 and 10). 5. Apparatus according to claims 1 to 4, characterized by two grippers (25, 24) pivotable about axes t27, 28) running parallel to the screw-in axis (14) for holding or feeding the screws (9) into the feed shaft (26) and a third lever (23) which can be pivoted about an axis (29) lying transversely to the screw-in axis (14), in order to advance the screws (9) held in a supply strip. 6. Device according to claims 1 and 4, characterized in that the feed lever (23), which is resilient in the direction transverse to the feed plane of the screws (9), has an engagement arm (30), one of which, in the feed direction (31), has a delimitation (32 ) runs approximately at right angles to the feed direction and the other limit (33) is bevelled at an acute angle and that the gripper (24) provided for holding the advanced screws (9) is designed as a spring-loaded lever, the one end limit (47) pointing in the feed direction (31) ) runs approximately at right angles to the feed plane and its other, opposite end limit (48) is at an acute angle to one limit (47). 7. Device according to claims 5 and 6, characterized marked. net that the feed lever (23) via an actuating lever (41) is adjustable, the two arms (42, 45) are constantly supported over the entire displacement length of the control rods (6, 7) on a corresponding control pin (20), the one arm (42) or the guideway (43) of the same for the pin (20) in the rest position approximately axially parallel to the control rod (7) and the other arm (45) or its guideway (43) is angled at an acute angle to the straight line. 8. Device according to claims 1 to 7, characterized in that the provided for inserting the screws (9) in the feed shaft (26) gripper (25) has at least two spaced parallel insertion arms (49, 50), webhe in Engage slots in a guideway (52) bridging the area between the feed plane of the screws (9) and the feed shaft (26). 9. The device according to claim 1 and one of the preceding claims, characterized in that the feed plane of the screws (9) through the screw axis (14), two displaceable and pivotable grippers (106, 107), each with a plurality of gripper teeth (108 , 109) are provided for the feed, the opening of the feed shaft being closable by the foremost gripper tooth (109) (FIG. 24). 10. Device according to claims 1 and 2, characterized in that the feed shaft (26) is guided in a height-adjustable manner and is spring-loaded in an upper rest position and one arm (72) of a two-armed lever (71) engages on the feed shaft (26) and the other Arm (75) has a runway (74) for a control pin (20) of a control rod (7), the arm (75) of the lever (72) having the runway (74) for the displacement of the feed shaft (26) in the last section the range of movement of the ends of the control rod (7) is arranged (Fig. 6, 11, 12). 11. The device according to claims 1 and, characterized in that the carriage (84) for the supply of the washers (8) between two end positions below the feed shaft (26) for the screws (9) and below a magazine (10) for the Washer (8) is displaceable, on the slide (84) with a control pin (21) of a control rod (6) two-armed lever (85) which can be brought into operative connection and which is spring-loaded in the direction of the feed position (FIGS. 15 to 18). 12. The apparatus according to claim 11, characterized in that the lever (85) cooperating with the slide (84) engages with its one arm (88) in the uppermost movement section of the control rod (6), this arm (88) on its free End has a groove (89) formed from two sections perpendicular to one another and at least the section pointing downward in the direction of movement of the control rod (6) is open at the bottom and expanded at its end. (Figs. 15 and 16). « 13. Device according to claims 1 and 11, characterized in that the carriage (84) has an opening (93) corresponding to the size of the washer (8), spring-loaded and / or displaceable or pivotable at the edge region of the opening (93) Holding elements, e.g. B. spring-loaded pin with spike-like tips (94), engage (Fig. 17 and 18). 14. Device according to claims 1, 11 and 13, characterized in that the carriage (84) on its upper side has groove-like depressions (95, 96), in which below the magazine (10) formed projections (97, 98) at the Engage the sliding movement of the carriage (84) (Fig. 17 and 18). 15. The apparatus according to claim 13, characterized in that on two end faces of the opening (93) of the carriage (84) rotatably mounted bolts (99) are provided which have a flattened portion (100) on one longitudinal side and in this position the full Release the opening cross-section, the bolts (99) being held on spring-loaded levers (101) which can be actuated directly or indirectly by the control rods (6, 7) (FIGS. 19 to 21). 16. The apparatus according to claim 13, characterized in that on two end faces of the opening (93) of the carriage (84) pivotally or displaceably held flaps (104) webs or the like are provided, which directly or indirectly from the control rods (6, 7) can be actuated (Fig. 22). 17. The device according to claim 1 and one of the preceding claims, characterized in that the carriage (84) is attached to a rotatably mounted lever (111) and z. B. 90 degrees from a position in the magazine to a position below the feed shaft is pivotable (Fig. 25). 18. The apparatus according to claim 17, characterized in that the carriage is fastened together with the lever (111) fastened thereon to a rotating body (112) designed with grooves (114, 115), the grooves (114, 115) of the Rotating body (112) engages a control pin (21) of a control rod (6). 19. The apparatus according to claim 18, characterized in that at the intersection points (116, 117) of the two over a section of the length of the rotating body (112) parallel grooves (114, 115) fixed deflector (120) with opposite run-up slopes (122 ) are provided, the control pin (21) engaging in the grooves (114, 115) being spring-loaded in its axial direction. 20. Device according to claims 1 and 17 to 19, characterized in that the lever (111) and the slide (84) are designed as a one-piece, flat plate (130), with a radial distance from the axis of rotation (138) of this plate (130) or the rotary body (112) connected to this, a transmission lever (140) is pivotally attached, the other end of which is fed with a lever, gripper (141) or the like for feeding the screws (9) into the feed shaft (26). is in operative connection. 21. The apparatus according to claim 20, characterized in that the transmission lever (140) engages chemically pivotable intermediate lever (151) parallel to the screw-in axis, on which with a radial center distance a lever (145) pivotally and against a fixed stop (161) held spring-loaded is. 22. Device according to claims 20 and 21, characterized in that one end of the transmission rod (140) is displaceable in a sleeve-like bearing piece (147) and is held in a rest position against this spring-loaded.

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