DE2111102A1 - Machine for making strips of rod-shaped fasteners - Google Patents

Description

Machine for making strips of rod-shaped fasteners

The invention relates to a machine for producing Strips of rod-shaped fastening means in which the fastening means have parallel shafts are arranged in a row and held together by at least one plastic band, with a conveyor device, which has a toothed, evenly revolving conveyor body, between whose teeth the Shafts of the fastening means held at precisely defined distances from one another by a counter pressure bar with an applicator that is placed on both sides of the row of fasteners conveyed by the conveyor still applies plastic beads,

and with a molding device, which has molding rollers in a row, which are arranged on both sides of the fastening means / and cooperate in pairs to create the plastic beads that are still plastic and are applied in the applicator to deform the fastening means of the fastening means row holding together the plastic tape. The term fasteners are nails, screws or the like here. to understand.

A machine of this type is known from US Pat. No. 3,432,985. In this known machine is as Conveyor body provided a gear, the teeth of which hold nails at precisely defined distances from each other and that Evenly circumferential the nails between the nozzles of an application device and through the gap between two forming rollers leads through.

So that the nail strips produced with this known machine in machines processing nail strips, e.g. in pneumatic nailers or the like., are processed properly it is important that the plastic tape holding the nails together is always perfectly and identically shaped is. For this purpose, the forming rollers of the known machine are mounted immovably in the machine frame

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But waves befestigt.Dies has the disadvantage that the Einformwalzen be destroyed if formed unsuitable in the nip between the Einformwalzen, for example curved to Dicka or nails, or do not fall exactly into a ^e gap between the teeth of the gear wheel lying nails. Since the forming rollers must consist of a very resistant material and therefore form relatively expensive components, the operation of the machine mentioned is considerably disrupted in the event of such an incident.

The invention is based on the object to provide a machine for

. .,. clie air.a Si: nfogin- - ^:

Manufacture of strip yon fasteners to create /. device "with forming rollers cooperating in pairs and in which the destruction of the forming rollers by inappropriately shaped or improperly arranged ones is certain Fastening means is excluded. . ._

This object is achieved in a machine of the type mentioned according to the invention in that at least one in the conveying direction νοχι the plastic belt the final Form-giving forming roller-effective display device is provided, which shows an unsuitably shaped or unsuitable

stabilizers
net arranged command / displays, and that a switch is provided which switches off the application and conveying device on the basis of the display of the display device.

This ensures that every improperly shaped or unsuitable

stabilizers suitably arranged fastening / before the shaping rollers that give the plastic strip its final shape, i.e. that are immovably mounted is indicated by the display device and that in this case, the control device switches off the conveying and application device. The one operating the machine The person can then immediately determine the cause of the fault and eliminate it.

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An advantageous embodiment of the machine according to the invention is characterized in that a Conveyor chain is provided, whose first deflection wheel in the conveying direction about a non-displaceable in the machine frame Axis is rotatably mounted and the members of which have the teeth that as a display device before the inlet end through the counter pressure bar and the conveyor strand of the conveyor chain Limited conveyor gap a compartment wheel is provided, which is about a to the axis of rotation of the first IM steering wheel Conveyor chain parallel axis rotatable on a pivotable about an axis parallel to this axis against the force of a spring Arm is mounted opposite the first deflection wheel so that between the fastening means of the strips to be conveyed compartment teeth provided by fastening means before the engagement of the chain teeth on the circumference of the compartment wheel intervene, which determine the correct position and the correct spacing of the fasteners for the engagement of the chain teeth, and that the arm is provided as an actuator of the switch. Thereby / that the Abteilrad compared to the first Deflection wheel is mounted so that between the fastening means of the series of fastening means to be conveyed Compartment teeth of the compartment wheel engage before the chain teeth engage, the incoming fasteners even before touching the conveying strand of the chain, introduced into the conveying gap in an orderly manner at the correct distance. As a result of that the first deflection wheel is rotatably mounted about an axis that cannot be displaced in the machine frame and the dividing wheel is mounted on one against the force of a spring pivotable arm is mounted opposite this first deflection wheel, it is achieved that with each improperly shaped or improperly positioned fastening means a tooth of the dividing wheel onto the shank of the fastening means hits. As soon as this fastener with a tooth of a chain link that is still on the deflection wheel in contact, the compartment rack is turned off swiveled out of its normal position and thereby the control device to switch off the conveyance and order pre-

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- Any -

direction actuated.

In a further advantageous embodiment of the invention the tensioning device of the chain can be provided as a display device, which when an un-

by means of suitably shaped or improperly arranged fastening /

into the conveyor gap between the conveyor strand of the conveyor

beiiu chain and the counter pressure bar through the / penetration

P an improperly shaped or improperly arranged

agent ' _e

start / occurring increase in chain tension the control device switches on to switch off the conveyor and application device. This through the jig of the Conveyor chain formed display device can alone or better in combination with that formed by the compartment wheel Display device provided sain. By using the two different types of display devices mentioned a particularly high level of security is achieved,

means that improperly shaped or improperly arranged fastening / do not get into the gap between the forming rollers that give the plastic strip its final shape.

Another advantageous embodiment of the invention is characterized in that, in the case of at least two pairs of forming rollers, one of the first pair of forming rollers is provided as a display device and for this purpose on a slide block that can be displaced against the force of a slide block is stored, which cooperates with the switch. This ensures that the first pair of forming rollers is used to preform the plastic and only the second

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A pair of forming rollers gives the plastic belt its final shape. Therefore, if an improperly shaped or improperly

stabilizers
net arranged Befe / penetrates into the gap of the first forming roller pair, these are not damaged because of the flexible mounting of one forming roller or inappropriately arranged screws enter the gap of the second pair of forming rollers that give the plastic strip the final shape. This display device can be used alone or with one or both of the aforementioned display devices in a machine. When using all three completely differently working display devices it is avoided with the greatest possible certainty that the shaping rollers which give the plastic strip the final shape can be damaged by an unsuitably shaped or unsuitably arranged fastening means.

in order to now use the two last-mentioned display devices, namely the display device formed by the chain tensioning device and display device formed by the flexible mounting of a forming roller, as fast as possible and allowing easy removal of the interference by the operator is another advantageous one Embodiment of the invention provided that on the machine frame Two guide rails are attached above the conveyor gap, which have a guide gap for the shafts with their

,, .. - -, ..,,. ,. limit that

Heads hanging on the guide rails / the counter-pressure bar and the single-orm rollers on a slide arranged with it on the same side of the conveyor gap are arranged, the i'n a rest position in which

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the counter pressure bar and the one arranged on the slide Sinform rollers at a greater distance from the conveyor strands of the conveyor chain or the forming rollers mounted in the machine frame is, and in a 'working position' is movable in which the counter pressure bar the conveyor gap and the. Forming rollers limit pressure gaps. This creates the possibility that when a disturbance occurs,

l. within the conveyor gap. the slide in its "rest position

.lung "can be moved so that then ......

the disruption can be eliminated very quickly and easily without the fastening means hanging on the guide rails fall out.

The invention is described in the following description of exemplary embodiments of a machine shown in the drawings according to the invention for producing nail strips explained in detail.

Show it:

1 and 2 are only a schematic side view and a corresponding plan view of the exemplary embodiment;

3 shows a partial plan view in the direction of arrow III in FIG. 1 in an enlarged illustration;

FIGS. 4 and 5, sections IV and V in FIG. 3 on an enlarged scale Depiction;

Fig. 6 one of the Fig. ι corresponding side view in a larger representation, which for the most part shows the section along the line VI - VI in Fig. 3 shows;

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Fig. 7th Fig. 9 Fig. 10 Fig. 11 Fig. 12th Fig. 13th

and 8 sections along the lines VII - VII in FIG. 3 and VIII - VIII in FIG. 6;

a view in the direction of arrow IX in Fig. 6;

a side view of a cooling tube;

a side view of a broken piece shown in the execution ^ - example manufactured nail strips;

a section along the line XII - XII in Fig. Uj

13 and 14 sections according to the lines XIII - XIII and XIV - XIV in Fig. 6 and 13 of a modified one Embodiment.

15 shows a partial side view of the exemplary embodiment according to FIGS. 13 and 14. With the machine described below, nails 9 arranged in a row with shafts parallel to one another are produced connected to a nail strip by means of three plastic straps 93 (Fig. 11/12).

As can be seen from Fig. "1, the machine consists of two parts arranged on racks 1 and 2, namely one designated as a whole with 3, one conveyor and one A molding device forming part which is arranged on the frame 1 and which forms an application device 4 Part which is mounted on the frame 2 so as to be pivotable about a vertical axis 5.

The machine part 3 is built on a base plate 6, which is attached directly to the frame 1. This base plate 6 carries the actual machine frame of the machine frame part 3. When the machine frame is used in the following, this always refers to those This refers to parts that are firmly connected to the base plate 6.

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The conveyor

Two guide rails 7 are attached to the machine frame (FIGS. 7, 8) which delimit a guide gap 8 for the nails 9 from both sides. The width of the guide gap 8 corresponds to the diameter of the shafts of the nails 9, so that these nails hang with their heads on the guide rails 7 and are guided with their shafts in the guide gap 8. Because the upper part of the frame 1 carrying the base plate 6 is inclined with respect to the horizontal, the guide rails 7 parallel to the base plate 6 also have an inclination through which the nails fed to the guide gap 8 in FIG slide in the machine part 3.

The machine part 3 is divided into two parts by its vertical center plane extending along the guide gap 8, namely into a stationary part shown at the bottom in FIG. 3 and a slide 11 shown at the top in FIG Machine frame fixed guide rods 12 (Fig. 6,8) perpendicular to the central plane of the guide gap 8 between the working position shown in Fig. 3 and a position further above, i.e. further away from the central plane of the guide gap 8 by means of a compressed air cylinder 13 fixedly mounted in the machine frame, the piston rod 14 of which engages on tabs 15 of the slide 11. In order to prevent new nails from being fed through the guide rails 7 to the machine part 3 in the rest position of the carriage 11, a locking needle 16 (Fig. 3) can be provided in front of the machine part 3 directly under the guide rails 7, which is located on the piston rod of a compressed air cylinder 17 is attached. For controlling the air cylinder 17 can a machine frame (Fig. 6 and 9) fixed to the roller lever valve 18 vorgesehln ^ ⁿ the roller 19 with a fixed to the carriage 11 as cam 21 together

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acts that in the rest position of the carriage, the locking needle 16 from her / Fig. 3 illustrated the conveying path of the nails releasing position into the conveying path of the nails locking locked position is moved. If the carriage moves into its working position, then the locking needle is 16 again from the locked position into its release position moved back.

Furthermore, a with the base plate f and thus with the. Machine frame permanently connected end position switch 22 / is provided, the pin of which interacts with a cam 23 fastened to the carriage 11 in such a way that the limit switch 22 is actuated when the carriage is in the rest position. The limit switch 22 is connected to the circuit that has a variable speed for the. . ,. drive motor 24 with / conveyor device and a drive motor l

the -

v! ^ Applicator 4 feeds. By actuation

of the limit switch 22, this circuit is in the rest position of the carriage 11 interrupted.

The conveyor device has a conveyor chain 25 which is guided around two deflection wheels 26 and 27. The single ones Links 28 of the conveyor chain 25 have outwardly protruding teeth. 29 to ~ - (Figs. 3 and 4).

The first Ural steering wheel 26 of the conveyor chain in the conveying direction is about an axis 31 which cannot be displaced in the machine frame rotatably mounted. The second deflection wheel 27 is together with the drive motor 24 and an angular gear 32 mounted on a plate-shaped carrier 33, which is supported by "claws 30

; guided parallel to the guide rails 7 displaceable auf.der base plate 6 is mounted (Fig. 6 and 7).

To tension the conveyor chain 25, a tensioning screw 34 is used, which is threaded into a threaded hole of one with the

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Support 33 firmly connected elbow 35 engages. The end of the clamping screw 34 is supported on a collar pin 36 from, the · '"._."' "~ -" "■ / ':" A plate spring 37 is guided displaceably against the force within a bush 38 firmly connected to the base plate 6 is and the end facing away from the collar 39 supported on the plate spring 37 through a hole in the bottom of the Bushing 38 reaches through and rests against the pin 41 of a switch 42 which, when actuated, the circuit dssAntrivesmotors 24 of the conveyor chain 25 and the drive motor 10 of the application device 4 interrupts *

The conveying strand of the conveyor chain 25 (Figs. Η and 8) extending from the first deflecting wheel 26 to the second deflecting wheel 27 on the side adjacent to the central plane of the guide gap 8 delimits, together with a counter-pressure bar 43 (Fig. 3) resiliently mounted on the carriage 11 by means of springs 40 and 6) a conveying gap for the shafts of the nails 9. The counterpressure strip 43 keeps the shafts of the nails 9 at precisely defined distances from one another by the teeth 29 (FIG. 4) of the chain links 28. So that the chain cannot evade, the chain links 28 are supported on the side facing away from the counter-pressure bar 43 by a guide plate 44 (Fig 50 is fixedly connected to the machine frame. To adjust the guide plate 44, an adjusting screw 45 can be provided, which has two thread parts 46 and 47 in the same direction, of which the thread part 46 engages in a nut thread firmly connected to the machine frame and the thread part 47 engages in a nut thread on a shoulder 48 on the guide plate 44 . The thread pitch of the threaded part 46 is greater than that of the threaded part 47, so that a very precise setting of the guide plate 44 can be achieved by turning the adjusting screw

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- ■ * € · -

is possible. At the den. Conveying strand of the conveyor chain 25 facing On the side of the guide plate 44, a hardened support rail 49 is exchangeably attached.

To mount the slide 11 on the guide rods 12, it has two bearing blocks 51 with spherical bushings 52,

(Fig. 6, 8)

which are slidably seated on the guide rods 12 /. The bearing blocks 51 are connected to one another by a plate 53. The plate 53 is perpendicular to the central plane of the guide gap 8 extending grooves 5 4, in which slide blocks 55 are slidably mounted. On the plate 53 is a cover plate 56 covering the grooves 54 is attached. On the cover plate 56 two bearing blocks 57 are attached, in which perpendicular Each of these slide blocks is mounted so that it can be displaced to the center plane of the guide gap 8 58 indicates ar. his the center plane of the guide gap 8 turned away. End of an axial threaded hole in which engages a threaded part of an adjusting screw 60, the corresponding to the adjusting screw 45 with two threaded parts in the same direction of rotation but with a slightly different pitch is. The other threaded part of the adjusting screw 60 engages in a nut thread of a bearing block 57 attached Approach 56 'a. At the end of the slide blocks 58 facing the guide gap 8 there is a support strip 59 attached, which carries the counter pressure strip 43. The support bar 59 is connected to the counterpressure bar 43 by screws 61

(Fig. 8)

connected ^ which are so long that the counter pressure bar 43 under Formation of a gap 62 can be moved away from the support strip 59. Between the support bar 59 and the counter-pressure bar 43 compression springs (not shown) are inserted in the drawing, through which the counterpressure line 43 always steers with the formation of the gap 62 at a distance from the support "" bar 59 is kept cre.

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Before the inlet end of the conveyor gap 101 delimited by the counter-pressure strip 43 and the conveyor strand of the conveyor chain 25 is a dividing wheel 102 at the end of one arm of a two-armed lever 103 about one to the axis of rotation 31 of the first

(Fig. 3..4, 5) deflection wheel 26 parallel axis 104 freely rotatably mounted ?. Of the Lever 103 is mounted pivotably about an axis 105 parallel to axis 104. There are two on the second arm of the lever 103 Lockable by Korfer nuts in threaded bores running perpendicular to the pivot axis 105 and to the longitudinal axis of the hub 103 the same adjustable adjusting screws 106 · and 107 are provided. In addition, this is the second arm of the Lever 103 a tension spring 108 which the end of the adjusting screw 106 against a stop formed by the machine frame 109 and the end of the adjusting screw 107 against the end of the actuating pin 111 of a limit switch 112 that is turned on by this pressure. The limit switch 112 is in the circuit of the drive motors 10 and 24 of the application device 4 and the conveyor chain 25 switched so that they can be operated when the Adjusting screw 106 rests against its stop 109.

The dividing wheel 102 has dividing teeth 113 on its circumference, which are arranged at the same distance from one another as the teeth 29 of the chain links 28, and is {on the other side the middle plane of the guide gap 8 as compared to the The first deflection wheel 26 is arranged so that the nails arriving in the guide gap 8 shortly before the engagement between the teeth 29 of the chain links 28 are detected by the compartment teeth 113 and arranged between them and shortly thereafter still are located between the compartment teeth 113 if they have already penetrated into the spaces between the teeth 29 of the chain links 28 are. As a result, the freely rotatable compartment wheel 102 is driven by means of the nails of the conveyor chain 25 and aligns the

2Π9Β38 / 039 (:

Nails for perfect detection by the conveyor chain 25 off.

The compartment wheel 102 here forms a display device that indicates improperly shaped or improperly positioned nails. This is because a compartment tooth 113 meets with such a nail on the nail. As a result, the dividing wheel 102 swivels out against the force of the tension spring 108 in FIG. 5 in a clockwise direction, whereby the adjusting screw 107 is lifted from the actuating pin of the limit switch 112 and this is switched off becomes, resulting in an immediate shutdown of the drive motors 10 and 24 of the application device 4 and the conveyor chain 25 has the consequence. IM the entry of the nails from the gap between the dividing wheel 102 and the conveyor chain 25 into the conveyor gap To ensure between this and the counterpressure bar 43, the one facing the conveyor chain 25, otherwise it is straight running side surface of the counter pressure bar to Formation of an inlet at the inlet end bevelled (Fig. 3).

One of the two guide rails 7 is located behind the counterpressure bar 43 and the conveyor chain 23 of the conveyor chain.

(Fig. 3)

limited conveyor gap an interruption 92 / when starting the machine can through this interruption 92 the not yet connected by a plastic band 93

connected nails 9 fall out. If the application device 4, to be described in more detail below, is switched on, then, at the beginning, a perfect formation of the plastic band 93 is not guaranteed for so long the continuous flow of plastic has not yet started. The interruption 92 enables this unsuitable nail parts from the guide gap; 8 lead out and cancel.

In order to hit hard when the carriage 11 moves from its rest position to its working position and back on the machine frame are known buffers, not shown in the drawing, E.g. buffer bodies or disks made of a rubber elastic material and / or dampened and moveable in mugs Bearing buffer pins provided.

The compressed air cylinder 13 for moving the carriage 11 has a piston that can be acted upon twice. In the compressed air supply line, not shown in the drawing, for moving the slide 11 into the working position, a vent valve is switched on, which is opened after the slide IX has moved into the working position in order to lower the force acting on the slide when it enters the working position. This prevents the forming rollers 64 and 65 from being pressed with too great a force against nails which have not yet been correctly aligned and thereby being damaged. After the nails have run in properly, the vent valve is closed so that the compressed air cylinder 17 is subjected to full pressure. The closing of the vent valve can also be automatically coupled with the switching on of the application device.

The molding device

The molding device has molding rollers which cooperate in pairs 63, 64 and 65. The five forming rollers arranged in front of the central plane of the guide gap 8 according to FIG. 1 FaT ^ lnä um in the machine frame 3 fixed axes 66 freely rotatable stored. For this purpose, the forming rollers 63 at their lower end bearing journals 67 * /, which are fixed in the machine frame Bearing bores 68 engage from above so that the E in form rollers 63 can very easily be puffed out.

8? « F Q * i ü P,

The cooperating in pairs with the forming rollers 63 fixedly mounted in the machine frame and, according to FIG. 1, behind the central plane of the guide gap 8 lying molding rollers 64 and 65 are in the same way as the molding rollers 63 by means Bearing pin 69 in bearing bores 71 of the slide blocks 55 of the carriage 11 freely rotatably mounted (FIG. 7).

■ * ■> *

Adjustment screws 72 (FIG. 7) are provided for the forming rollers 64 and an adjusting screw 70 (FIG. 8) is provided for the forming roller 65. Each of the adjusting screws 72 and 70 has two thread parts 73 and 74 of different pitches in the same direction. The threaded part 73 engages / an axial threaded bore of the associated slide block 55. The threaded part 74 of the adjusting screws 72 and 70 engages in threaded bores 75 or of insert pieces 77 and 78, which are arranged in a common groove 79 extending parallel to the central plane of the guide gap 8. The insert pieces 77 have a length corresponding to the width of the groove 79. The insert of the adjusting screw 70, on the other hand, is somewhat shorter and is resiliently held by disc springs 81 on the side wall of the groove 79 which is closer in the guide gap 8. This results in a resilient mounting of the forming roller 65 of the first forming roller pair. The adjusting screw 70 of this resiliently mounted forming roller 65 has a collar 83 on its adjusting knob 82 , on which the end of a stop screw 84 lies, which is provided on one arm of a two-armed release lever 85 (FIG. 3) which can pivot about an axis 87 is stored in the carriage 11. The stop screw 84 is pressed against the collar 83 by the pressure of a compression spring 86 provided on the second arm of the release lever. This second arm of the release lever 85 has at its end a second stop screw 88 which contacts the actuating pin 89 of a pilot valve 91. The pilot valve 91 is for this purpose

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seen to actuate a pulse valve, not shown in the drawing, the operation of the air cylinder 13 triggers.

As a result, the resiliently mounted first forming roller 65 of the carriage 11 forms a display device which indicates an improperly shaped or improperly arranged nail. If such a nail comes between the first forming roller 63 and the forming roller 65, then the teeth of the forming roller 65 hit the nail so that the forming roller 65 is deflected perpendicular to the center plane of the guide gap 8. As a result, its slide block 55 and with it the associated adjustment screw 70 _f its collar 83 moves the release lever 85 about its axis 87 in FIG actuates the actuating pin 89 of the pilot valve 91 and this triggers the actuation of the compressed air cylinder 13. Since the carriage is in its working position, it is now moved into its rest position by the compressed air cylinder 13, the drive motors 10 and 24 of the application device 4 and the conveyor chain 25 being switched off by the limit switch 22 and by the roller lever valve 18 (Fig. 6 and 9) the locking needle 16 is moved into its locking position blocking a further supply of nails.

The applicator

The application device v / eist an extrude ^ 121, which over a gear lZZ / from the drive motor 10 of the application device is driven. The drive motor 10, the gear 122 and the extruder 121 are in a common machine

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r / is

arranged, which is rotatable about the axis 5 on the frame 2 - gelacrart «At the exit of the extruder 121 is an angle injection head 123 / arranged, the one with two nozzle bodies 124, which are arranged at a distance from one another with directed nozzles /. D. The nozzle mouths of the two nozzle bodies are larger than double and smaller than 2.5 times the diameter of each other of the nail shafts. In the illustrated embodiment, this distance is preferably equal to the um 0.2 mm enlarged double the diameter of the nail shafts.

As the applicator 4 can be pivoted about the axis 5, the spray head 123 can be switched between a rest position, in which it is located outside the machine part 3, and a working position in which the two nozzle bodies are are located on both sides of the central plane of the guide gap 8, are moved back and forth. To determine the working position is in the machine frame of machine part 3

not y shown r
an adjustable / stop is provided which ensures that the center plane of the gap between the two nozzle bodies 124 can be set exactly in accordance with a center plane of the guide gap 8.

IM the by means of the nozzles 125 on both sides of the row of in the guide gap 8 hanging nails 9 applied viscous plastic after its molding by the molding rollers 63, 64 and 65 to cool down are in the last three spaces between the on each side of the center plane of the guide gap 8 lying 5informwalzen 63 and / or. 64 vertical directed to this central plane and shortly before this ending cooling tubes 127 (Fig. 6 and 10) are provided which laterally Radial nozzle bores 128 directed towards the adjacent forming rollers and at their free ends towards the front

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the central plane of the guide gap 8 have nozzle bores 129 directed. These cooling tubes 127 are mounted with their center plane of the PührungsSpaltes 8 remote ends to branch lines 131, _o for example in bores of this welded. The branch lines 131 are connected to a compressed air network or a blower via a valve ″ (not shown in the drawing).

W e rk ung swe i s e

The application device is located before the machine is started up 4 and the carriage 11 in their rest positions, in which the angle spray head 123 is outside the machine part 3 and the carriage 11 are arranged in its end position furthest from the central plane of the guide gap 8 are. In this position, the operator can easily

ijl «

be checked, OD / forming rollers 63, 6Λ and 65 as well as the angled injection head 123 are clean and in order. If errors are found here, then both the individual forming rollers 63> 64 and 65 and the individual nozzle bodies 124 of the angled spray head 123 or the latter itself can easily be replaced.

When starting up, the application device is first placed in their working position swiveled in, in which the angle injection

not shown

head 123 on the / stop of the machine frame of the machine part 3 rests so that the center plane of the gap between the nozzle bodies 124 coincide with the central plane of the guide gap.

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Then the compressed air is via a valve not shown in the drawing via a corresponding compressed air line the compressed air cylinder 13 supplied so that the carriage 11 is moved into its working position. This is done by releasing the roller lever valve 18 moves the locking needle 16 out of its locking position / so that now in the guide gap 8 nails 9 that are possibly available can slide along the guide gap as far as the compartment wheel 102.

Before the drive motor 24 of the conveyor chain 25 is switched on, the vent valve of the relevant compressed air supply line is activated opened for the compressed air cylinder 13, so that the forming rollers 63, 64 and 65 with significantly reduced

held

Strength in the working position / become. After switching on the drive motor 24, the teeth 29 of the conveyor chain 25 grip the nails 9 on the dividing wheel 102 and convey them in Direction to the first pair of forming rollers 63, 65. Here, the dividing wheel 102 is set in rotation by means of the nails 9 and takes over a pre-alignment of the nails by keeping them exactly at a distance from each other so that the Teeth 29 of the chain links 28 can safely engage between the nail shafts. Through the spring-loaded counter pressure bar 43 the nails are held firmly in the spaces between the teeth 29 of the chain links 23 in a vertical position.

The forming rollers have longitudinal grooves 94 at their start, the longitudinal center lines of which are arranged at a distance from one another which is equal to the distance between the axes of the nail shafts located in the guide gap 8 from one another, and form such an acute angle with the axis of rotation of the respective forming roller that each groove, when it is in the conveyor gap is located, runs vertically and can accommodate a nail shaft. These longitudinal grooves 94 result in a Profiling of the peripheral surface of the forming rollers, which the from Fig. 12 apparent profiling of the to be formed

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Plastic band 93 corresponds. When the nails 9 are fed by the conveyor chain 25, they penetrate into the longitudinal grooves 94 of the forming rollers 63, 64 and 65 and take these rollers with them. By the fact that the vent valve of the compressed air cylinder 13 is still open, the slide is only in its working position with little pressure, so that, if occasionally a nail gets between two projections of the forming rollers, these are not damaged because the slide can dodge. As soon as the row of nails has massaged the last pair of forming rollers 63, 64, and the forming device is now penetrated by an uninterrupted row of nails, the conveyor device is started completed and it can be closed the vent valve of the compressed air cylinder 13th, so that the carriage is now held in its working position with great pressure.

Then the previously heated extruder 121 is started by switching on the motor 10 via a further switch, not shown in the drawing. The extruder screw conveys the plastified plastic into the nozzle body 124 of the angular spray head 123 64, 65, on the other hand, are formed into three plastic ^{strips 93} , which consist of sleeves 95 comprising the nail shafts and webs 96 connecting them. This shaping of the plastic strips 93 takes place in the five pairs of rollers in steps up to the desired final state. During the operation of the application device 4, cooling compressed air is simultaneously blown through the cooling tubes 127 both onto the forming rollers 63 and 64 and onto the plastic strip to be molded ^ 3

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the start of the conveyor device not yet connected by any plastic band nails fall through the interruption 92 out. This interruption also allows 92 nail strip parts that are not yet perfectly formed at the beginning Plastic tape can be led out and broken off.

If an unsuitably shaped, e.g. too thick or crooked, nail or an improperly positioned nail in the machine, e.g. too close because of a deformed head, then can this can first be determined by the compartment wheel 102, which then abuts this nail with one of its compartment teeth 113 and is pivoted out of its working position when the nail is moved further by the conveyor chain 25, the limit switch 112 is actuated and thereby both the drive motor 10 for the application device 4 and the drive motor 24 for the conveyor chain 25 are switched off. The operator can now clear the error immediately by swinging it out remove the dividing wheel and remove the unsuitable nail. As soon as the compartment wheel is released, the Machine on again.

However, an unsuitable nail should come off any one of the compartment wheels Reason are not determined, then there is an increased when this nail enters the conveyor gap The chain is tensioned if, for example, the nail does not fully penetrate the gap between two teeth 29 of the conveyor chain 25 can. This increase in chain tension actuates switch 42, which in turn actuates the drive motors 10 and 24 are switched off. The operator can now move the slide 11 by actuating valves accordingly move to its rest position and eliminate the cause of the disturbance. After the malfunction has been eliminated, the machine can

3! 0> H! J B

be put back into operation again.

However, an improperly shaped vein should be improperly arranged Nails are not displayed even by the display device formed by the chain tensioning device, then any nail that could somehow damage the forming rollers will in any case enter the nip between the first forming rollers 63 and 65 cause the resiliently mounted forming roller 65 to yield, whereby the pilot valve 91 is actuated and the carriage then immediately through the compressed air cylinder 13 into its Rest position is moved, in which he simultaneously the drive motors 10 and 24 switches off. Thereby it is avoided with certainty that the nail endangering the forming rollers between the subsequent, around fixed axes of rotation rotatable forming rollers device and there could cause damage to the same.

To shut down the system, a corresponding valve, not shown in the drawing, is finally actuated, whereby the carriage 11 is moved into its rest position in which it switches off the drive motors 10 and 24 _{and £} j _aC rf. causes the movement of the locking needle 16 in its locking position.

The nail strips made with the machine described above are practically endless. In practice, however, it is desirable that the nail strips have a certain predetermined one Have length. The cutting of an endless strip of nails into strip sections of a given length by special Nail strip cutters to which the endless nail strip is fed immediately after its manufacture is therefore generally, e.g., U.S. Patent 3,315,436

2 Ü 9 8 "} Q f Q '! 9 8

(Fig. 22 to 25) known.

With these known nail strip cutters, however, the same problem occurs as with the one described above Machine for the production of nail strips, because here too the knife blade must be destroyed, just like with the machine described above the destruction of the forming rollers, by improperly shaped or improperly arranged Nails are excluded.

In the embodiment shown in FIGS. 13 to 15

For example, in the case of the one forming roller 164, at least the last forming roller pair 163, 164 as seen in this direction . a * two longitudinal grooves 194 separating from each other Rib 197 replaced by a knife blade 198 extending along the center line of the rib, which in the guide gap 108 has the opposite rib 109 of the other forming roller 163 touches. It is thereby achieved in a surprisingly simple manner that the machine for manufacturing the nail strip at the same time also cuts these strips into strip sections of the desired length without that it must be feared that the knife blade on an improperly shaped or improperly arranged Meets the nail in the nail strip. A particular advantage of this arrangement is that no particular

the

Drive of the / knife blade-bearing forming roller 164 is necessary, since the two rollers 163 and 164 by the engagement of the sleeves 95 of the tapes 93 of the finished nail strip be taken away by this. This also ensures that the cut is exactly in the middle of a web 96 of the bands 93 takes place and the knife blade is minimally stressed because the plastic here is not yet as hard as it would be if the nail strip left the machine for a long time

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would be cut open after it was made. In order to protect the knife blade 198 even further, the one with the Mold roller 164 cooperating molding roller 163 made of a hard plastic.

In order to make it easier to replace the forming roller 164 when the knife blade is worn, it is on the slide 11 stored.

Now it is when the nail strip enters, as long as this one is not yet properly manufactured, it is undesirable to cut it into sections. This is why for adjusting the slide block 155, which carries the forming roller 164, a compressed air cylinder 199 is provided, by means of its forming roller 164 carrying the knife blade 198 at any time, even when the carriage 11 is in the working position can be lifted from their working position.

In the known nail strip cutters there is still the disadvantage that the force exerted when cutting through of the nail strip must be overcome, the nail strip compresses in front of the knife roller and thereby both is raised in the gap between the rollers as well as in front of them. This danger is with the machine according to the 13 and 14 are significantly reduced because here the plastic is still relatively soft when it is cut. Nevertheless, a slight compression cannot be avoided. For this reason, in the illustrated embodiment above or just before the gap between the forming rollers 163 and 164 and directly above the head of the nails 9 attacking hold-down provided. To fasten the hold-down device, the guide gap 8 is bridged Bracket 201 attached to the guide rails 7, on which one ends of several lamellar abutting one another

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Leaf springs 202 are attached. At the free ends of the leaf springs 202 is a bearing 203 for a freely rotatable Steel roller 204 attached, the outer diameter of the support surface of the guide rails 7 just as it is far away that the nail heads can move freely through it. This will cause a lifting and possibly a skewing of the nails in the gap between the rollers 163 and 164 avoided with certainty.

In addition, the one shown in FIGS. 13-15 Exemplary embodiment before the last pair of forming rollers 163 and 164 used to cut the nail strip only three pairs of forming rollers are provided because practice has shown that three pairs of forming rollers are completely sufficient, to give the bands 93 the necessary shape. For this purpose, here is "the penultimate pair of forming rollers of the off-_ ■ management example according to Figs. 1. to 12 omitted.

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Claims (1)

Claims ljj Machine for the production of strips of rod-shaped fasteners in which the fasteners _Λ with parallel shafts in a. Row are arranged and held together by at least one plastic band, with a conveyor device which has a toothed, evenly revolving conveyor body, between the teeth of which the shafts of the fastening means are held at precisely defined distances from each other by a counter-pressure bar, with an application device, which is attached to both Sides of the row of fasteners conveyed by the conveyor device still applies plastic beads, and with a molding device which has molding rollers which are arranged on both sides of the row of fasteners and cooperate in pairs to form the still plastic beads applied in the applicator to which the fasteners of the row of fasteners hold together To deform a plastic band, characterized in that at least one A display device (34, 36 ,. 37; 65; 102) is provided which indicates an improperly shaped or improperly arranged fastening means, and that a switch (42; 91, 22; 112) is provided which switches off the application and conveying device (4 or 25) on the basis of the display of the display device . 2) Machine according to claim 1, characterized in that a conveyor chain (25) is provided as the conveyor body, whose the first deflection wheel (26) in the conveying direction is rotatably mounted about an axis (31) which cannot be displaced in the machine frame is and the members (28) have the teeth (29) that as 2 09838/0396 Display device in front of the inlet end of the through the counter pressure bar (43) and the conveyor strand of the conveyor chain (25) limited conveyor gap a dividing wheel (102) is provided, which is about a to the axis of rotation (31) of the first Utelenkrades (26) of the conveyor chain (25) parallel axis (104) rotatable about one to this axis (104) parallel axis (105) against the force of a spring (108) pivotable arm (103) opposite the first deflection wheel the to be promoted (26) is mounted so that between the fasteners / medium range
- / before the engagement of the chain teeth (29) on the circumference of the Abteilrades (102) provided compartment teeth (113) engage, which the correct position and Fixing means determine the correct distance between / for the engagement of the chain teeth (29), and that the arm (103) is provided as an actuating member of the switch (112). 3) Machine according to claim I or 2, characterized in that that a conveyor chain (25) with a tensioning device (34, 36, 37) is provided as the conveyor body, which when over-tensioning the conveyor chain (25) against the force of a spring (37) gives way, and that the tensioning device as a display device is formed, which switches the switch (42) when the spring (37) is over-tensioned. 4) Machine according to claim 3, characterized in that for tensioning the conveyor chain (25) the one deflection wheel (27) is mounted on a carrier (33) which, in relation to the machine frame, is in the clamping position by means of a clamping screw (34) is movable that a pin (36) is provided as a display device on which the clamping screw (34) and which can be moved against the force of the spring (37) with respect to the machine frame, and that the pin (36) cooperates with the switch (42). 209838/0 396 5) Machine according to one of the claims 1-4, characterized in that with at least two pairs of one-end rollers (63, 64, 65) which one forming roller (65) of the first pair is provided as a display device and for this purpose mounted on a slide block (55) which can be displaced against the force of a spring (81) is, which cooperates with the switch (91, 22). 6) Machine according to one of claims 2-5, characterized in that the machine frame over the conveyor gap two guide rails (7) are attached, which have a guide gap (8) for the shafts of the with their heads Fasteners limit the guide rails (7) hanging / (9), that the counter-pressure bar (43) and that arranged with this on the same side of the conveyor gap (8) Forming rollers (64, 65) are arranged on a carriage (11) which: in "a * rest position in which the counter pressure bar (43) and di *. arranged on the slide (11) Forming rollers (64, 65) at a greater distance from the conveyor strand of the conveyor chain (25) or the one in the machine frame mounted forming rollers (63) is located, and can be moved 'into a' working position in which the counter-pressure bar (43) the conveyor belt and the forming rollers (63, 64, 65) limit the pressure gap. 7) Machine according to claim 6, characterized in that each forming roller (64, 65) arranged on the slide (11) is connected to its own slide block (55) is rotatably mounted, which is transverse to the vertical center plane of the conveyor gap (8) is adjustable and adjustable in the slide (H). 8) Machine according to claim 5, 6 and 7, characterized in that that for adjusting each slide block (55) 209838/0396 70) one adjusting screw (72, / is provided, the two has the same thread parts (73, 74) of different pitch, one of which in a threaded hole of the slide block (55) and the other engages in a threaded bore (75, 76) of an insert piece (77, 78), which is mounted in a groove (79) of the carriage (11) that the insert (78) of the first in the conveying direction Slide block (55) for the first forming roller (65) is shorter than the width of the groove (79) and by the force the spring (81) is held on the side of the groove (79) adjacent to the conveying gap. 9) Machine according to one of claims 6 to 8, characterized that for moving the carriage (11) at least one pressure medium cylinder, preferably a compressed air cylinder (13), which is intended to run in the fasteners with a smaller one and to hold in the working position can be subjected to a greater pressure. 10) Machine according to one of claims 6 to 9, characterized in that that a switch (22) is provided, which by the movement of the carriage (11) in the rest position is switchable and thereby switches off the application and conveying device (4 or 25). 2oaBa8 / oi ^ i 1.1) Machine according to claim 5 and 1O _7, characterized in that the slide block (55) of the first forming roller (65) of the carriage (11) cooperates with a valve (91) / which, when actuated by the slide block (55), the movement of the The carriage (11) in its rest position and thus indirectly triggers the actuation of the switch (22), 12) Machine according to one of claims 1 to 11, characterized characterized in that the one forming roller (164) of the last forming roller pair viewed in the conveying direction (163,164) on at least one rib (197) separating two longitudinal grooves (194) one longitudinally the center line of the rib extending knife blade (198) which in the conveying gap the opposite Touches rib (199) of the other forming roller (163). 13) Machine according to claim 12, characterized in that that the shaping roll (163) lying opposite the shaping roll (164) carrying the knife blade (198) consists of a hard plastic. 14) Machine according to claim 6 and 12 or 13, characterized in, that the shaping roller (164) carrying the knife blade (198) is mounted on the slide (11). 15) Machine according to claim 7 and 14, characterized in that for adjusting the slide block (155) with the shaping roller carrying the knife blade (198) (164) a pressure fluid cylinder (199) is provided. 209833/0183 16) Machine according to one of claims 12 to 15, characterized characterized in that a directly above the gap between the last pair of forming rollers (163, 164) Hold-down devices (201-204) engaging over the heads of the fastening means (9) are provided is. 17) Machine according to one of claims 6 to 16, characterized characterized in that one of the two guide rails (7) is seen behind in the conveying direction the molding device (63, 64, 65) has an interruption (92). 18) Machine according to one of claims 1 to 17, characterized in that the application device (4) has a spray head (123) which is provided with two nozzle bodies (124) on different Sides of the central plane of the guide gap (8) are arranged with nozzles directed at them, that the distance (d) of the nozzle orifices of the two nozzle bodies (124) from one another is greater than twice and is less than 2.5 times the diameter of the largest nail shafts, preferably equal to that Twice the shaft diameter increased by 0.2 mm. 19) Machine according to claim 18, characterized in that the spray head (123) in a rest position in which he is outside of the conveyor, and in a working position in which the both nozzle bodies (124) are located on both sides of the central plane of the guide gap (8), movable, is preferably mounted pivotably about an axis (5). 209838/0396 20) Machine according to one of claims 1 to 19, characterized characterized in that cooling tubes (127) running perpendicular to the central plane of the guide gap (8) are provided on each side of this center plane between at least the last in the conveying direction Forming rollers (63, 64) lying one behind the other engage and radial, have against the forming rollers and axial nozzle bores directed towards the center plane.