DE20007656U1 - Separating device for screwing machines - Google Patents

Description

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Description

The invention relates to a separating device for screwing machines for screwing in fastening elements, in particular for fastening insulating material on flat and shed roofs by means of screws loosely stored in an approximately vertically aligned magazine, each inserted in a plastic holder with a support plate or in a washer, with a lowerable

&iacgr;&ogr; Screwing unit, which activates the separating device and a holding device arranged below the magazine by its lifting movement in order to transfer the fastening elements individually from the separating device to the holding device, in which the fastening elements are picked up before screwing and then released

is, according to the preamble of the main claim.

Screwing machines of the type mentioned at the beginning are used for the most efficient fastening of roof sealing and insulation material on flat and shed roofs and are available in a wide variety of designs. One such screwing machine is known from the German patent application DE 42 40 607 A1. This screwing machine has a feed device for the fastening elements, a lowerable screw unit and a holding device for the fastening element, which first picks it up before screwing in and then releases it. Pre-assembled, two-part fastening elements, in particular consisting of a holding part and screw, are processed in this device. The known screwing machine is extremely susceptible to faults, which is why rapid screwing is not possible. In particular, the transfer of a fastening element that has been separated from the magazine or from the other fastening means to the screwing position is not possible without faults. The screw tip of the

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Screw rods must not engage with the fastening element or immerse themselves in the fastening element.

In contrast, the present invention is intended to provide a considerably simpler and improved automatic screwing machine which is not afflicted with the problems of the known devices.

This task is solved by a separating device for screw machines of the type mentioned above by

&iacgr;&ogr; the separating device is arranged at the end of the magazine near the holding device and consists of a slider which can be moved horizontally and transversely to the magazine and which has two locking pawls which, caused by the lifting movement of the screw unit, engage in the stacking level of the magazine and present, separate and

The lowest fastening element, separated from the magazine stream, is fed into the holding device.

This creates a separation device that works in the smallest of spaces in the simplest but most effective way possible. The slider practically only moves along a path that roughly corresponds to the shaft diameter of the fastening element. Since no parts of the device swing out horizontally, the action radius of the slide is limited to the width or length of the housing, which makes it possible to have a narrow design for the screw machine.

The invention also makes it possible to work on sloping roof surfaces. Even if the screwing machine equipped with the separating device according to the invention is in an inclined position, each fastening element is removed from the magazine without any problems and separated from the following fastening elements.

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The slider conveniently carries a pin that is guided within a control bar that can be lowered vertically and linearly together with the screw unit. The linear movement of the control bar in particular means that deviations in the slider movement are almost impossible. The control bar is connected to a centering block of the holding device and is directly coupled to its stroke movement. Stroke delays of the screw unit are therefore not transferred directly to the control bar and therefore also not to the slider.

&iacgr;&ogr; can move out of its closed position.

In an expedient embodiment of the invention, it is provided that the separating device is arranged on the housing cover of a housing of the screw machine. This gives the separating device a stable base and protects it as far as possible against damage that could impair its function.

In a further expedient embodiment of the invention, it is provided that the slide is approximately U-shaped and has a web with which it is movably guided within tabs arranged on the housing cover. This forms a simple but functional linear guide for the slide.

In a further advantageous embodiment of the invention,

2s, the magazine is rigid and has an ejection end that is directed towards the holding device. Compared to pivoting magazines, the magazine of the device according to the invention is more favorable in its forward movement. This means that the fastening elements located in the magazine are not exposed to any pivoting movements by the magazine and remain relatively evenly positioned in the magazine, which

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subsequent interaction with the separating device is made considerably easier.

In a further advantageous embodiment of the invention,

s provided that the ejection end of the magazine is at least partially formed by the magazine housing and that the magazine housing has openings at its end near the separating device through which the locking pawls of the slider pass. The separating device thus forms a magazine closure which, controlled by the

&iacgr;&ogr; lifting movements of the screwdriver are opened or locked.

In a further expedient embodiment of the invention, a receiving and ejection opening is formed between the locking pawls of the slide and the magazine, with a separation chamber located within the slide, between the locking pawls. This allows the fastening elements to be separated in a very small space, namely within the slide itself.

Further advantages and advantageous embodiments of the invention can be found in the following description, the drawings and the claims.

The drawing shows a particularly preferred embodiment of the invention.
Showing:
Figure 1 is a side view of a screwing machine equipped with the separating device according to the invention
Figure 2 is a front view of the screwing machine from the direction indicated in Figure 1

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Figure 3 an enlargement of the screwing machine in the area of

Housing, without magazine and without separating device
Figure 4 is a section along the line IV-IV indicated in Figure 3
Figure 5 is a plan view of the housing cover of the screwing machine without any structures and without any through-plate

Components
Figure 6 is a perspective view of the inventive

Separation device

Figure 7 is an enlarged side view of the screwing machine in the area of the separating device according to the invention

Figure 8 shows the device from the same angle as

in Fig. 7 but without magazine

Figure 9 a perspective view of the magazine
Figure 10 is a view of the right half of the magazine from the direction X indicated in Fig. 9

Figure 11 is a side view of the magazine from the position shown in Fig. 10

indicated direction Xl
Figure 12 the detail marked XII in Fig.11 in a

enlargement

Figure 13 a perspective view of the closed gripper
Figure 14 the dismantled gripper parts in a perspective

Depiction

Figure 15 the left fork arm of the gripper in a front view
Figure 16 the left fork arm of the gripper in a side view from the direction marked XVI in Figure 15

Figure 17 the left fork arm of the gripper in a top view
Figure 18 the left fork arm of the gripper in a rear view
Figure 19 the left fork arm of the gripper in a side view, from the direction indicated in Fig. 18 XIX
Figure 20 the right fork arm of the gripper in a front view

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Figure 21 the right fork arm of the gripper in a side view from the

Direction XXI

Figure 22 the right fork arm of the gripper in a top view

Figure 23 the right fork arm of the gripper in a side view, from

the direction XXIII indicated in Fig. 24

Figure 24 the right fork arm of the gripper in a rear view

Figure 25 a perspective view of the centering block

Figure 26 a front view of the centering block

Figure 27 a side view of the centering block

Figure 28 a top view of the centering block

Figure 29 is an enlarged view of the upper portion of the device

Figure 30 the rail with carriage in a front view

Figure 31 a side view of the rail with carriage

Figure 32 a top view of the rail with carriage

Figure 33 a fastening element that can be processed in the device

Figure 34 the handle in an enlarged view

As can be seen in particular from Figures 1 and 2, the structure of the automatic screwing machine, designated as a whole by 1, is similar to that of a stick. A screw unit 4 extends over a housing 2, the screw rod of which (not shown in detail) is surrounded by a multi-part, telescopic lifting sleeve 6, 7. The screw unit 4 is clamped in clamping jaws 56, 57 of a carriage, designated as a whole by 51, and can be moved together with the carriage in a vertical direction.

This is done by exerting a vertical downward pressure on the handle 53. A rail 50 aligned parallel to the screw-in axis 3 provides a linear guide on the slide 51. The slide 51 itself is supported by a gas pressure spring 52. By the up and down movement of the screw unit 4, in a magazine 35 arranged approximately parallel to the screw-in axis 3, upstream, approximately shaft-parallel

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Fastening elements 65 are separated. The lifting movement of the screw unit causes the separating and feeding elements to be moved mechanically, and as a result one fastening element 65 is taken out of the superimposed stream of upstream fastening elements 65 from the magazine 35 and brought into the desired screwing position coaxially to the screwing axis 3. There it is grasped by the screwdriver rod of the screw unit 4 and driven into the roof substrate.

&iacgr;&ogr; Before the function of the screwing machine 1 equipped with the separating device according to the invention and the movement sequence of all the individual parts involved in the magazine storage as well as the separating and screwing process are discussed, the device parts are described in detail below.

The housing of the device 1 is designated with 2. The housing 2 has the shape of an upright prism. The corner areas are delimited by vertically rising columns 87, 88, 89, 90. The housing 2 is open towards the front side 13, on its wall 20 closest to the magazine and towards the base 10, with a cutout 91 in the base 10 which is delimited by a circumferential support edge 14. The side opposite the front side 13 is closed with a housing wall 11. The side far from the magazine is also closed with a housing wall 12. Two control grooves 16, 17 are incorporated into the housing wall 12. A fork arm 18, 19 of a gripper 5 is guided in each of these control grooves 16, 17, which for this purpose has pins 92, 93 on its fork longitudinal axes 23, 24 which engage in the control grooves 16, 17. The upper area of the housing is closed with a housing cover 8. This housing cover 8 is a rectangular plate with rounded corner areas.

The housing cover 8 has a notch 96 on one of its long plate flanks, in which the magazine 35 with its rear strip 126

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is attached. There are three cutouts in the interior of the plate. The first, slot-shaped cutout 97 serves to allow a control bar 36 to pass freely through (see e.g. Figure 4). Another cutout in the plate is the circular cylindrical hole marked 28 through which the lifting sleeve 6,7 (see e.g. Figure 4) is passed. The gas pressure spring 52 is passed through the hole 208 provided in the edge area. The rail 50 (see e.g. Figure 3) is partially accommodated in the cutout marked 98. The housing cover is connected to the columns 87, 88 located underneath by means of the screws 101-104 screwed into the corner areas.

&iacgr;&ogr; 88, 89 and 90 connected.

On the outside of the housing wall 11, a bearing block 94 is attached for receiving a castor 67, over which a protective plate 95, also attached to the housing wall 11, extends. On the inside of the housing wall 11, a bearing plate 64 is attached, in which the

is gas pressure spring 52 with its piston rod 63.

The housing wall 12 with the control grooves 16 and 17 is aligned parallel to the screw-in axis 3. The control groove 17 is a mirror image of the control groove 16. A special feature is that the control curves 16, 17 each have a lower curve run-out 83, 85 in addition to their linear sections 105, 106, and also have a deflection 107, 108 in the upper section. Both the curve run-outs 83, 85 and the deflections 107, 108 lead away from the screw-in axis 3.

The separating device designated 33 is attached to the housing 2.

Two approximately U-shaped tabs 109,110 are arranged on the housing cover 8. Both tabs 109,110 have a slot 111,112 that runs through the respective tab from its front side 113,115 to the rear side 114,116. The slots 111,112 have a clear width that corresponds approximately to the cross section of a slide 39 guided therein. The slide 39 is approximately C-shaped in cross section and

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thus has a web 119 lying orthogonally between two flanges 117,118. The web 119 is movably received in the slots 111,112 of the tabs 109,110 in the arrow directions "A" and "B". On its flanges 117,118, a locking pawl 40,41 extends orthogonally to these, offset in height from each other, the two free ends 43,44 of which end in approximately the same line. The locking pawls 40,41 extend horizontally approximately at right angles to the magazine's longitudinal axis and engage in the stacking plane 42 of the magazine 35. The length of the locking pawls 40,41 is selected such that between their free ends 43,44 and the respective

&iacgr;&ogr; opposite slide inner wall 45,46 there is a receiving opening 47 and an ejection opening 48. A separation chamber 49 is formed between the two openings 47,48. The locking pawls 40,41 are made of round material and extend through circular cylindrical openings 122,124 and 123,125 in the vertical bars 120,121 of the magazine 35. The

The movement of the slide 39 to the left or right (direction A or B) of the magazine 35 is effected by the guidance of a pin 38 within the control cam 37 of the control bar 36 when the latter moves downwards together with the screw unit 4.

The magazine is designated with 35. The magazine 35 essentially has a cage-like shape and consists of two vertical bars 120, 121 arranged parallel to one another at the front and spaced apart from one another in the front area, and a rear bar 126. The vertical bars 120, 121 and the rear bar 126 are connected to one another by frame bars 127, 128. The rear bar 126 is fastened to the housing cover 8 with its lower section. At about half the magazine height, the magazine 35 is fastened to the front of the rail 50 with an angle bar 129. In the upper section, the magazine 35 is closed with a clip 130. For this purpose, the vertical bar 120 of the magazine 35 has a pin 131 at its free end, which is gripped by a notch 132 in the clip 130. The clasp 130 is attached to the free end of the vertical rod 121 around its

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The magazine 35 is arranged so that it can pivot along its longitudinal axis. This allows the magazine 35 to be closed again after filling with fastening elements. Another special feature of the magazine 35 is the design of the ejection zone, designated as a whole by 32. An approximately Z-shaped finger 133,134 is attached to each vertical rod 120,121, which is bent in the direction of the screw-in axis 3. One of the fingers 133 shown is rigidly attached to the vertical rod 120 of the magazine 35 with its upper vertical section 135 by two screws 136,137. The adjacent finger 134, on the other hand, has in its upper section 147

&iacgr;&ogr; only one fastening screw 138, with which it is arranged on the vertical rod 121 so that it can rotate around the axis "Y". The upper sections 135,147 are each connected to an inclined slide 148,149 towards the ground, which are directed towards the free ends 30,31 of the gripper 5 in the interior 29 of the housing 2 (see e.g. Figure 4). The individual and

is released fastening elements onto the gripper 5. To prevent the finger 134 from moving out of its closed position by itself, a ball 140 under pressure from a spring 139 is inserted into the vertical rod 121, which ball presses into a recess 142 arranged on the inside of the finger 141. By rotating the finger 134 about the "Y" axis, an access opening to the gripper 5 is created.

The gripper designated 5 is essentially of a pincer-like shape. It consists of two fork arms 18, 19. Both fork arms 18, 19 are approximately L-shaped and each have a clamping jaw 143, 144 and a joint bracket 145, 146 through which the associated pivot axis 26 or 27 runs. The joint brackets 145, 146 are attached with their pivot axes 26, 27 to the rear side 25 of the centering block 9. The fork arms 18, 19 essentially have a wedge shape, with an upwardly open landing 150 being formed in the fork arm 18. The fork arm 19 forms the counterpart with a downwardly open landing 151, so that both fork arms in the area of their landings 150, 151

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interlockingly engage with one another. The inner sides 152,153 of the clamping jaws 143,144 are each formed with a keyway 154,155. On the rear sides 156,157 of the joint brackets 145,146, a pin 92,93 is provided which is arranged coaxially to the fork longitudinal axes 23,24 and which each protrudes into one of the associated control grooves 16 or 17 of the housing wall 12 of the housing 2 (see e.g. Figures 1 and 3). The pins 92,93 are attached so that they can rotate freely about their axis. Both clamping jaws 143,144 have an inclined back 158,159 which slopes down towards the bottom. This is advantageous, among other things, when a fastening element 65 (see Figure 33)

&iacgr;&ogr; is used with a screw 84 inserted in a plastic holder 86, in which the support plate 80 is concavely curved. The support plate 80 sits largely on the edge strips 160,161 of both clamping jaws 143,144.

is At a sufficient distance above the gripper 5, a centering block 9 is arranged at the lower end of the lifting sleeves 6,7. The centering block 9 has an essentially cuboid shape and is formed on its underside 162 with a concave curvature 165 extending between the short end faces 163,164, which corresponds approximately to the concave curvature of the support plate of a plastic holder. The long sides 166,167 protrude as narrow edge strips 170,171 over the curvature 165 and are themselves provided with an arcuate incision 168,169. The protruding edge strips 170,171 prevent an oval plastic holder received here with its support plate from twisting. 172 designates a circular cylindrical recess into which the lifting sleeve 7 is inserted and is secured from the underside of the centering block by means of screws screwed into the holes 173, 174. A grommet 176 is inserted into the step bed 175 provided in the center of the cylindrical recess, which rests with its collar-shaped flange 177 on the heel 178 of the step bed 175. The grommet tip 179 protrudes beyond the sole 180 of the concave curvature 165. In the rear

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The joint brackets 145,146 of the gripper 5 are screwed into threaded holes 181,182. These screw points thus form the pivot axes 26,27 of the fork arms 18,19. Two further threaded holes 183,184 are arranged in the front of the centering block 9, to which the control bar 36 is attached with the screws 191,192.

The control bar is designated with 36. The pin 38 of the slide 39 of the separating device 33 according to the invention engages in this. The control bar 36 moves without slipping at least in a partial section

&iacgr;&ogr; synchronously in the vertical direction with the screw unit 4. In this case, an actuating movement for the separation is derived by forcing the pin 38 into a transverse movement within the control cam 37. The control cam 37 has a vertical extension. Essentially, the control cam is divided into two linear sections 185,186 and two

is steering zones 187,188. The pin 38 of the separation remains at one height during the vertical movements of the control bar 36, but moves in this plane transversely to the left or right (in the direction of arrow A or B) by following the course of the control curve 37. In the starting position, in which the screw unit 4 is at the highest position, the pin 38 is positioned in the curve base 78. During the downward stroke of the screw unit 4, the control bar 36 moves vertically, linearly downwards and slides with the inner side 70 of its linear section 185 along the pin 38. After the screw unit 4 has been moved downwards a corresponding distance, the control bar 36 hits the pin 38 with its first steering zone 188. The inclinations of the steering zones are selected such that the pin 38 can be redirected without hindrance. After the steering zone 188 has passed the pin 38, the latter is received in the second linear section 186 until the curve apex 74 strikes the pin 38. The distance between the parallel linear sections 185,186 corresponds to the travel required for separating the fastening elements stored in the magazine 35.

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of the slide 39. When the screw unit 4 is returned to its upper starting position, the linear section 186 slides along the pin 38. After the second steering zone 187 reaches the pin 38, the latter is again deflected transversely and again received in the curve base 78. The linear movement of the control bar 36 is transmitted via the centering block 9, to which the control bar 36 is attached by means of screws 191,192.

The screw unit 4 is a standard screwdriver with a

Î extended screw rod (not shown in detail), at the free end of which a bit is arranged for the rotationally fixed grip of the screw head. The screw rod extends coaxially through the lifting sleeves 6,7 and is identical to the screw-in axis 3. The screwdriver is held by a quick-release fastener 193, which can be pulled downwards to release the

is releases the screwdriver so that it can be taken out of the device. When the screwdriver is reinserted, the quick-release fastener 193 snaps into place in the area of the drill chuck and holds the screwdriver in place. 194-197 designate holes in the lifting sleeve 6 into which the knurled screw 198 of the height adjustment device 199 engages in order to adjust the device to a wide variety of holder sizes. Fine adjustment can be made by turning the adjusting ring 200. Close to below the quick-release fastener 193, the screw unit 4 or the lifting sleeve 6 is accommodated in a two-part clamping jaw 56,57 which is part of a carriage designated 51. The carriage 51 has a sliding plate 58 to the rear 201 of which a carrier plate 60 is attached. In the head area, the sliding plate 58 carries a receiving block 202 into which the longitudinal tube 55 of the handle 53 is inserted. Grub screws 204-207 are inserted into the narrow sides of the carrier plate 60, with which the four running wheels 61,61a,62,62a are attached to the carrier plate 60. Between the wheel pairs, the vertically extending rail 50 is enclosed, along the flanks of which the

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Wheels roll during the downward stroke of the slide 51. The slide 51 is supported on the gas pressure spring 52. At its upper free end, the rail 50 has a stop 203, which at the same time specifies the stroke limit for the slide 51.

The handle of the device is designated with 53. It can be designed in two parts, as shown in Figure 34 (image from the rear of the device), and have a joint that is formed by a fork head design of both handle parts 209 and 210. For this purpose, the handle part 209 carries on its

‘ the longitudinal tube 55 near end a tab 212 which is inserted into a slot 211 of the second handle part 210. A bolt 213 is guided through the handle part 210 and the tab 212, which forms the pivot axis of the handle. This design is particularly advantageous when the device is used near the parapet. By pivoting the

By turning the handle part 209 in the direction of the arrow "z" and rotating the screwdriver by 90°, the device can be lowered on the screwdriver and on the handle part 210 without the handle part 209 coming to rest on the parapet. The joint of the handle 53 is designed in such a way that the handle tubes and their walls form a mutual stop. In the embodiment shown, these are the bevels 214 and 215, which prevent the handle part 209 from moving further downwards beyond the horizontal alignment. Alternatively, the handle part can also be pivoted horizontally or provided with a plug connection instead of in the vertical plane.

Various types of fastening elements can be processed in the screwing machine equipped with the separating device according to the invention.

Figure 33 shows a fastening element 65 which consists of a plastic holder 86 into which a screw 84 is inserted. For this purpose, the plastic holder 86 has a shaft 69 which has a

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has a concavely curved support plate 80. Instead of a round support plate, fastening elements which have an oval support plate can also be used. Support plate 80 and shaft 69 are penetrated by a lifting channel 82 arranged coaxially to the longitudinal axis 59, into which the screw 84 is inserted and emerges with its tip from the holder tip. The plastic holders equipped with screws are accommodated in the magazine of the device according to the invention.
Alternatively, fastening elements consisting of a screw and a washer, particularly a metal one, are used.

The function of the screwing machine equipped with the separating device according to the invention is explained below.
After the magazine 35 is filled with fastening elements 65, the screwing machine 1 is rolled to the assembly site. It is advantageous to

is when the running surface 68 of the roller 67 lies slightly above the support edge 14 of the housing 2. The roller 67 cannot come into contact with the ground when the device 1 is seated on it for the purpose of the screwing-in process. By slightly tilting the device in the direction of the roller 67, the housing 2 is separated from the ground and can be rolled to the desired assembly point. Firstly, the fastening elements 65 rest with their shaft 69 in an approximately horizontal, possibly slightly inclined orientation in the magazine 35, in a jostling manner on the upper pawl 41 of the slide 39. This starting position is shown in Figures 1 as well as in Figures 4, 6 and 7, with the screwdriver positioned in the uppermost position as shown in Figure 29. When the screw unit 4 is moved downwards by exerting pressure on the handle 53, the centering block 9 is also moved linearly downwards (see Figure 1, dash-dotted representation). This downward movement leads to a forced lowering of the control bar 36.

The pin 38 of the slide 39 slides along the inner guide wall 70 (see Figure 6) of the linear section 185 of the control cam

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37 and, after a corresponding stroke, hits the first deflection 71 of the steering zone designated 188. During the further downward movement of the control bar 36, the pin is guided onto the slope 72, whereby the slide 39 is pushed in the direction of the arrow "B". When the pin 38 reaches the second deflection 73, the slide 39 has covered its furthest path in the direction of the arrow "B" and the uppermost locking pawl 41 is retracted from the stacking level 42 of the magazine 35. The retracted locking pawl 41 frees up a receiving opening 47, i.e. this is positioned under the stacking level 42 of the magazine 35, whereby the

&iacgr;&ogr; the stacking column formed by the fastening elements 65 located one above the other falls into the separation chamber 49. The stacking column then rests on the lower locking pawl 40 which still projects into the stacking plane 42. The screw unit 4 is in its lowest possible position, with the pin 38 at the apex 74 of the outlet section 75 of the

is linear section 186. This first downward movement of the screw unit 4 practically represents a forward movement without a screwing process being carried out. The pressure on the handle 53 is then released, after which the gas pressure spring 52 causes the screw unit 4 to return to its uppermost position. The centering block 9 and the control bar 36 attached to it are also moved upwards, with the pin 38 sliding along the inner guide wall 76 of the linear section 186 of the control curve 37, which adjoins the run-out section linearly downwards. When the pin 38 reaches the deflection 77 of the steering zone 187 located at the lower end of the inner guide wall 76, this leads to a slider reset in the direction of arrow "A" when it is lowered further, since the pin slides along the slope 79 located between the deflection 77 and the lower sole 78. During this slider movement, the upper pawl 41 is positioned between the shaft 69 of the lower fastening element 65 and the shaft 69* of the fastening element 65* located directly above it, thus carrying out a separation in that the lowest fastening element 65 is separated from the

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fastening elements pushing above it. The fastening element 65 then located in the separation chamber 49 is released by the pushing back lower locking pawl 40 and falls over the ejection opening 48 onto the fork arms 18, 19 of the holding device 34. The fastening element 65 is pivoted with its longitudinal axis by approximately 90° so that the shaft 69 is directed downwards with its tip or towards the screwing point. If the screw unit 4 is pressed downwards again, the following fastening element is taken up into the separation chamber 49 during the active screwing process.

Î When the screw unit 4 is moved upwards, this fastening element is again separated from the fastening elements pushing above it by the upper locking pawl 41 sliding between the shafts of the two lowest fastening elements and feeding the lowest fastening element to the holding device 34.

is. The first up and down movement represents a filling stroke without a fastener being screwed into the roof substrate. The subsequent lifting movements entail a synchronous separation and advancement of the fasteners during the driving-in phase.

During the up and down stroke of the screw unit 4 and the device parts controlled thereby, the holding device 34 is also activated. When the screw unit 4 is in its uppermost rest position, the two fork arms 18, 19, which run synchronously with one another, are at their top dead center TDC in the respective control groove 16, 17. The distance between the two fork arms 18, 19 corresponds to an opening width at which the fastening element 65 can be taken over by the separating device 33 according to the invention without friction or obstruction when the screw unit 4 is guided upwards again after the first downward stroke and the lowest, separated fastening element 65 is presented. The fastening element 65 lies with the

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Underside 81 of its support plate 80 rests on the fork arms 18,19 which extend horizontally when the device is in the vertical position.
When lowering the screw unit 4 and thus the centering block 9, the fork arms are guided downwards through the control grooves 16,17.

5 upper section of the control cams, as soon as the fork arms 18,19 move downwards from their top dead center Ot, they are moved towards each other due to the control cam course. The fork arms 16,17 thus carry out a pincer movement in the area of the control cam position KP and clamp the shaft 69 of the fastening element 65 between them

&iacgr;&ogr; The fastening element 65 is thus also aligned in a position suitable for assembly, so that it cannot escape from the screw-in axis 3 until the screw rod is inserted into the lifting channel 82 of the fastening element 65. It is therefore unimportant whether work is carried out on a horizontal plane or on an inclined roof surface. The holding device always aligns the fastening element in the screw-in axis 3. During further lowering, the fork arms 18,19 pass through the lower curve area 83,85 and distance themselves from one another to such an extent that they emerge laterally under the support plate 80 and release the fastening element 65 in its entirety when the fork arms 18,19 move to their bottom dead center UT at the curve exit 83,85. The screw 84 of the fastening element 65 has already drilled into the substrate in this phase, so that the drill bit immersed in the fastening element cannot fall out or leave the screw-in axis through the fastening element.

2s allows. When the fastening element 65 is firmly screwed into the substrate, an upward movement of the screw unit 4 causes the fork arms 18, 19 to return from the bottom dead center U _T to their top dead center O t so that they are again ready to take over the next fastening element to be presented during the upward stroke.

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All features specified in the claims, the description and the drawings can be essential to the invention both alone and together with other features.

List of reference symbols

1 Screwing machine 2 Housing 3 Screw-in axle 4 Screw unit 5 Gripper 6 Lifting sleeve 7 Lifting sleeve 8th Housing cover 9 Centering block 10 Floor of 2 11 Housing wall 12 Housing wall 13 Housing wall/front 14 Support edge 15 - 16 Control groove 17 Control groove 18 Fork arm of 5 19 Fork arm of 5 20 Housing wall of 2 21 - 22 23 Fork longitudinal axis of 18 24 Fork longitudinal axis of 19 25 Back of 9 26 Swivel axis of 18 27 Swivel axis of 19 28 Drilling in 8 for 6 29 Housing interior 30 Free end of 18 31 Free end of 19 32 Ejection zone of 33/35 33 Separation device 34 Holding device 35 magazine 36 Control bar 37 Control curve

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38 cone 39 Slider 40 Pawl of 39 41 Pawl of 39 42 Stack level 43 Free end of 40 44 Free end of 41 45 Slide inner wall 46 Slide inner wall 47 Receiving opening 48 Ejection opening 49 Isolation chamber 50 rail 51 Sleds 52 Gas spring 53 Handle 54 - 55 Longitudinal tube 56 Clamping jaw of 51 57 Clamping jaw of 51 58 Sliding plate of 51 59 Longitudinal axis of 65 60 Carrier plate of 51 61 Wheel 61a Wheel 62 Wheel 62a Wheel 63 Piston rod of 52 64 Bearing plate of 52 65 Fastener 66 - 67 Castor 68 Running surface of 67 69 Shaft of 65 70 Inner guide wall of 37 71 Distraction of 37 72 Slope of 37 73 Redirection of 37 74 Vertex of 37 75 Run-off distance of 37 76 Inner guide wall of 37 77 Redirection in 37 78 Sole of 37 79 Slope in 37 80 Support plate of 65 81 Bottom of 80

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82 Lifting channel of 65 83 Curve exit of 16 84 screw 85 Curve exit of 17 86 Plastic holder 87 Column of 2 88 Column of 2 89 Column of 2 90 Column of 2 91 Excerpt from 10 92 Cones of 5 93 Cones of 5 94 Bearing block for 67 95 Mudguard v. 67 96 Incision in 8 97 Slit-shaped cutout in 8 98 Incision in 8 99 — 100 — 101 Screw in 8 102 Screw in 8 103 Screw in 8 104 Screw in 8 105 Linear section of 16 106 Linear section of 17 107 Deflection of 16 108 Deflection of 17 109 Tab of 33 110 Tab of 33 111 Slotting of 109 112 Slotting of 110 113 Front side of 109 114 Back of 109 115 Front side of 110 116 Back of 110 117 Flange of 39 118 Flange of 39 119 Bridge of 39 120 Vertical bar of 35 121 Vertical bar of 35 122 Opening in 120 123 Opening in 120 124 Opening in 121 125 Opening in 121 126 Rear bar of 35 127 Frame strip of 35

&bull; » » &iacgr; » &idigr;

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128 Frame strip of 35 129 Angle bar of 35 130 Clasp of 35 131 Pen to 120 132 Incision of 130 133 Fingers of 32 134 Fingers of 32 135 Section of 133 136 screw 137 screw 138 screw 139 Spring for 140 140 Ball in 121 141 Finger inside of 121 142 Hollow in 121 143 Clamping jaw of 18 144 Clamping jaw of 19 145 Joint plate of 18 146 Joint plate of 19 147 Upper section of 134 148 Slide of 133 149 Slide of 134 150 Landing of 18 151 Landing of 19 152 Inside of 143 153 Inside of 144 154 Keyway in 143 155 Keyway in 144 156 Back of 145 157 Back of 146 158 Back of 143 159 Back of 144 160 Edge strip of 143 161 Border strip of 144 162 Bottom of 9 163 Front of 9 164 Front of 9 165 Curvature of 9 166 Long side of 9 167 Long side of 9 168 Arched incision 169 Arched incision 170 Sidebar 171 Sidebar 172 Cylindrical recess in 9 173 Drilling in 9

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&bull; ti &iacgr; V

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174 Drilling in 9 175 Step bed in 9/172 176 grommet 177 Covenant of 176 178 Sales of 175 179 tulle tip 180 Sole of 165 181 Threaded hole in 9 182 Threaded hole in 9 183 Threaded hole in 9 184 Threaded hole in 9 185 Linear section of 37 186 Linear section of 37 187 Steering zone of 37 188 Steering zone of 37 189 — 190 — 191 Screw on 36 192 Screw on 36 193 Quick release 194 Drilling in 6 195 Drilling in 6 196 Drilling in 6 197 Drilling in 6 198 Knurled screw 199 Height adjustment 200 Adjusting ring 201 Back of 58 202 Recording block 203 Stop/stroke limitation 204 Screw in 60 205 Screw in 60 206 Screw in 60 207 Screw in 60 208 Drilling in 8 209 Handle part 210 Handle part 211 Slot in 210 212 Tab on 209 213 Bolt through 210 and 212 214 Slope 215 Slope

Claims (9)

1. Separating device for automatic screwing machines for screwing in fastening elements, in particular for fastening insulating material on flat and shed roofs by means of screws loosely mounted in an approximately vertically aligned magazine, each inserted in a plastic holder with a support plate or in a washer, with a lowerable screw unit which activates the separating device and a holding device arranged below the magazine by its lifting movement in order to transfer the fastening elements individually from the separating device to the holding device, in which the fastening elements are each received before screwing and then released, characterized in that the separating device ( 33 ) is arranged at the end of the magazine ( 35 ) near the holding device ( 34 ) and consists of a slider ( 39 ) which can be moved horizontally and transversely to the magazine ( 35 ) and which has two locking pawls ( 40 , 41 ) which, caused by the lifting movement of the screw unit ( 4 ), move into the stacking plane ( 42 ) of the magazine ( 35 ) and present the fastening elements ( 65 ), separate them and feed the bottom fastening element ( 65 ) separated from the magazine stream to the holding device ( 34 ). 2. Device according to one of the preceding claims, characterized in that the slide ( 39 ) carries a pin ( 38 ) which is guided within a control bar ( 36 ) which can be lowered vertically and linearly together with the screw unit ( 4 ). 3. Device according to one of the preceding claims, characterized in that the control bar ( 36 ) is fastened to a centering block ( 9 ) of the holding device ( 34 ). 4. Device according to one of the preceding claims, characterized in that the separating device ( 33 ) is arranged on the housing cover ( 8 ) of a housing ( 2 ). 5. Device according to one of the preceding claims, characterized in that the slide ( 39 ) is approximately U-shaped and has a web ( 119 ) with which it is movably guided within tabs ( 109 , 110 ) which are arranged on the housing cover ( 8 ). 6. Device according to one of the preceding claims, characterized in that the magazine ( 35 ) is rigid and has an ejection end ( 32 ) which is directed towards the holding device ( 34 ). 7. Device according to one of the preceding claims, characterized in that the ejection end ( 32 ) of the magazine ( 35 ) is at least partially formed by the magazine housing. 8. Device according to one of the preceding claims, characterized in that the magazine housing has openings ( 122 , 123 , 124 , 125 ) at its end near the separating device ( 33 ) through which the locking pawls ( 40 , 41 ) of the slide ( 39 ) pass. 9. Device according to one of the preceding claims, characterized in that a receiving and ejection opening ( 47 , 48 ) is formed between the locking pawls ( 40 , 41 ) of the slide ( 9 ) and the magazine ( 35 ), wherein a separation chamber ( 49 ) is located within the slide ( 3 ), between the locking pawls ( 40 , 41 ).