DE2002593B2 - DEVICE FOR CONNECTING BY FRICTION WELDING A LOOP SHAPED AROUND A THERMOPLASTIC TAPE - Google Patents

Description

The invention relates to a device for friction welding a loop-shaped connection thermoplastic tape wrapped around an object with attached to a housing, the overlapping tape ends wedging between them, transversely to the clamping direction clamping members movable relative to one another, one of which can be driven by a motor to perform an oscillating movement and is designed to be rotatable as a profiled roller.

Several methods and tools have been developed to use overlapping Tape ends of a thermoplastic tape looped around an object Friction fusion techniques can be linked together. Some of these well known Tools are operated pneumatically. They are disadvantageous in that often where the binding is appropriate should take place, a suitable compressed air source is not available. Network connections are almost available everywhere, but so far no

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signed, electric belllligles Reibungsverschmel- F i g. 3 is a top view of the in FIG. 2 shown

solution tool developed, tool,

Another known device is fully ao- Fig. 4 is a partial front view similar to Fig. 2,

naiisch. With her, the tape is automatically taken from one which the wheel and the anvil to grasp the

3and supply source withdrawn and to be compressed around the 5 band to be pressed into the band

the lacquered object. Then shows

one end of the tape is grasped and the other Fig. 5 is a partial detail view showing the assembly

The end of the strap is subjected to tensile stress to tension the loop, work between the strap loop and a tensioning

whereupon the overlapping tape ends are shown by the nungsfühteinrichtung,

Friction are fused. Fully automatic region FIG. 6 shows a section essentially along the line

riites are very complicated and expensive and on line 6-6 in Fig. 3,

Because of this fact, it is not suitable for many purposes.

net. yet the location of the elements at the end of a

The majority of the known frictional fusion tensioning cycles show

tools is therefore hand-operated, 15 Fig. 8 is a section essentially along the

the tape by hand around the line to be packaged, line 8-8 in FIG. 3,

object passed around, so that the tape ends F i g, 9 have an enlarged section essentially

overlap. Only then is the tool actuated along the line 9-9 in FIG. 8th,

and with its help the band loop is tensioned and FIG. 10 shows an enlarged section essentially

which causes frictional fusion. Known hand ao along the line JO-IO in F i g. 8th,

tools of this type work satisfactorily and FIG. 11 shows an enlarged section essentially

have found wide coverage, but are borrowed along line 11-11 in Fig. 8,

bulky and heavy. With prolonged activity, FIG. 12 shows a section essentially along the tire

hence the operator quickly. The line 12-12 in FIG. 10,

Tool difficult from a working part to a 25 F i g. 13 one of the FIGS. 11 similar cut, the

others are transported. the position of the parts during the clamping movement of the

In the known friction fusion tools, the gripping wheel shows

Moreover, the mechanism for effecting the to- Fig. 14 is similar to Figs

squeezing the overlapping tape ends cut, which changes the position of the parts during the back and forth

and the movement of these tape ends relative to one another 30 shows the movement of the tape gripping element,

other grain to obtain frictional fusion- Fig. 15 is a partial front view of a second Aiis-

complicated and correspondingly expensive. In particular, the form of management of the device,

it was necessary on the one hand for the assembly Fig. 16 a section showing the drive assembly

press the overlapping tape ends and the embodiment according to Fi g. 15 shows, and

on the other hand for the movement of these tape ends rela- 35 F i g. 17 is an enlarged section essentially

to provide different means to each other. along line 17-17 in FIG. 15th

The object of the invention is to provide a handy and in the embodiment according to FIGS.

A welding device which can be transported without difficulty comprises a tool 20 in a frame in the form of a

to create in a compact design. Housing made up of interlocking housing elements

This task is formed in a device of the elements H and 22, which are connected to one another.

In accordance with the invention, the type mentioned at the outset are thereby fastened by means of screws 23. A handle 24 is

solves that the role is provided via its motor drive at the upper end of the tool 20 and

can only be rotated intermittently in one direction until it consists of inverted U-shaped handle parts

one inserted into the motor drive 25 and 26, which is connected to the housing elements A 21 resp.

switched voltage sensor scanned previously 45 22 are firmly connected. The housing elements 21 and

The correct tension in the thermoplastic tape 22 is essentially thin-walled, cup-shaped

is reached and only then to the back and forth parts, which together form a hollow interior or

Form going oscillating movement with frictional contact of a chamber 27.

Belt ends can be driven. The tool 20 is shown in FIG. 1 on a pack of P

The fusion fusing tool is shown extremely light and 50 with the rear end portion 28 of a

squat. It can therefore be operated easily. Loop L made of thermoplastic tape

Even when working over long periods of time, the end section 29 of the belt overlaps and

the user does not tire. The tool works at the overlapping tape sections between one

In addition, it is electrical and can therefore be used anywhere, with a roller 30 and a belt anvil 31 arranged

will. 55 are. The rear end portion 28 of the tape can

The invention is explained below on the basis of the up to a corresponding tape supply (not

Drawing described. Shown therein shows) extend. A drive device that

Fig. 1 is a top perspective view, which will be described in detail below, is in FIG First embodiment of the device according to the chamber 27 of the tool 20 is provided to the Invention wherein the device stood on a counter 60 anvil 31 up into the band In the exciting and closing state, oppressive relationship with the roller 30 is shown is to slide the roller 30 to retract the

FIG. 2 shows an enlarged front view of the front, upper, rear band section 28 according to FIG. 1 Direction according to FIG. 1, with the wheel and the Am- to drive intermittently to the left, so that the bottom of the tool to grasp the tape at the 65 loop L around the object together distance are shown from each other, to be overlapped and tensioned, and to the to be able to arrange pending tape sections between to roll 30 relative to the anvil 31 back and forth, move in order to create a physically sliding friction

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movement between the opposing surfaces - a substantially annular wall 62, the portions of the overlapping band portions 28 and extending from surface 61 forward, and this 29 for causing melting between wall 62 works with surface 61 and with the after To evoke surfaces. The drive device in the chamber 27 comprises 5 together in order to jointly form a chamber 63 therebetween, an electric motor M (FIG. 8), which is rotating. A ratchet wheel 64 is provided in chamber 63 in output shaft 33, the left end of which is provided in surface contact with surface 61 and a bearing 34 in the rear wall of the housing and provided with a central hexagonal bore 65, the front end of which is carried in a bearing 35 is slidably placed on the shaft section 60. that is seen in an intermediate housing wall 36 in front of teeth 66 around the circumference of the click wheel 64. A sleeve 37 is at the right end of the to work with a ratchet mechanism (Fig. 12 shaft 33 preferably by a spline connection to 14), as described below, and the sleeve 37 is in the bearing 35 (Fig. 9) is arranged around the intermittent rotary movement of the shaft and has a section 38 with a size 55 to transfer it into an oscillating movement,
rem diameter, which on the right side of the 15 The shaft 55 also has a portion 68 of the bearing 35 is applied. A corresponding bearing holder, with a larger diameter in front of the section 60 such as a C-ring 39, is arranged in an annular groove in the on and the transition between the shaft sleeve 37 and is on the left side of the sections 60 and 68 simulates one rear white bearing 35, as shown in FIG. 9 can be seen. A pin sending shoulder that holds the ratchet wheel 64 against the 40 extending from the sleeve 37 in eccentric ao rocker arm surface 61. The shaft portion 68 in relation to the motor shaft 33 of FIG. 12 is supported in the housing member 22 by a bearing 69 externally, as best seen in FIGS. 13 and 14, in a through bore thereof, and is. The pin 40 protrudes through a bore 41 in one of the tape gripping wheel 30 is at the outer end of this block 42, which is arranged for sliding movement on shaft section 68. The shaft section is arranged a pin 43, which extends at right angles to the 25 68 has an axially directed bore 70 in the essential pin 40 (Fig. 12). For this purpose, the borrowed over its entire length, and the band block 42 with a transverse bore 44 below the gripping wheel30 is provided with a countersink 71 to bore 41, and a bushing 45 (Fig. 10) a construction with extremely light weight is preferably provided in the bore 44 to create.

to wear the pin 43. 30 A one-way clutch 75 is in the chamber 63. When the motor M is now energized, seen around the oscillating movement of the rocker arm 50, the eccentric pin 40 moves on a circular to a discontinuous rotary movement of the shaft 55 orbit concentric to the axis of the motor shaft 33, and to convert, and in the embodiment shown, the block 42 is being moved up and down and from one side to the one-way clutch the shape of several after another on the pin 43. As will be shown later on, clutch teeth 76 pointing inwards, which will become more cylindrical, move as a result of the fixed drical rollers 77 absorb between them. The arrangement of the shaft of the gripping wheel 30 of the block 42 teeth 76 are shaped in such a way that they also offer the rocker arm 50 axially along the eccentric pin 40 the possibility of moving in a clockwise direction ) relative to the shaft section 68, and for this purpose the rocker arm 40 rotates when the rocker arm 50 in the counterclock 50 a pair is turned laterally at a distance from each other in the clockwise direction (FIG. 13), connecting the nete parallel Arms 51 and 52 (Fig. 10) with curse rollers 77 the teeth 76 with the shaft section 68, bores 53 and 54, respectively, which are penetrated by the ends around the shaft 55 and the gripping wheel 30 in the clamping direction of the pin 43. The rocker arm 50 tion to rotate.

A device is provided for sensing an axis defined by a shaft 55 of the gripping wheel 30 when a predetermined amount of tension is reached. As can best be seen in FIG. 10 in the tape loop L , the rear end 56 of the tension sensing device comprises a planar shaft 55 rotatably supported in a lug 57, the plate-shaped lever 80 (FIG. 11), which stretches outward on its sides facing outwardly from the housing element 21. A holding element 58 is provided on the outer flap 81 and 82, which is received in openings 83 or cut of the shaft end 56 by means of a pin 59 in the housing elements 21 and 22 in order to prevent the shaft 55 from becoming entangled will. The lever 80 has a tension moving the frame forward. A movement of the feeler finger 85, which extends backwards from the housing element shaft 55 to the frame, is slowed by the 55 22 outward through a further opening 86 therein, larger gripping wheel 30, as it subsequently extends through, and this finger 85 is clearly above it will. Thus, when the block 42 and anvil 31, with the front, lower band abder pin 43 being moved by the eccentric pin 40 and cut 29 under the finger 85 and the upper, rear off, the rocker arm 50 swings about the band portion 28 above the Fingers 85 is the axis of the shaft 55, and the sliding engagement between 60 (Fig.4). The anvil 31 has an upwardly facing the block 42 and the pin 40 enables protruding transverse rib 87 outside an arcuate portion 89 knurled during this movement of the block 42, which moves axially with the band. Hand wheel 30 cooperates to press the overlapping shaft 55 has an enlarged hexagonal band sections 28 and 29 therebetween to press 65 further from the shaft end 56 from section 60. When the band loop L is initially pulled around the inside and this shaft section 60 lies against the package, the lower band hangs on a flat, forward-facing surface 61 on the section 29 in an area 88 between the rib rocker arm 50 (Fig. 10). The rocker arm 50 has 87 and the portion 89 in through, and after

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a predetermined amount of tension in which the housing member 22 is attached, and the lever 110 loop L has been created, the lower snaps has a stop surface 112 (FIG. 4), which of section 29 of the tape from the position shown in FIG Hook 113 on a locking lever 114 festhalin the position shown in FIG. 5, around the lever 80 can be detected after tend. The locking lever 114 can be pivoted at the top into the position according to FIG Openings 83 to the locking lever 114 and the housing element 22 and 84 is provided to the lever 80 a free strength to allow the hook 113 with the stop surface movement. 112 to keep in touch (Fig. 2). If the

The pivoting movement of the lever 80 is opposed by a lever 114 from the position according to FIG. 2 to the position resistance by a spring 91 according to FIG. 4 is pivoted to the hook 113 CF ie 2) which is arranged in a vertical bore 92 in which of the stop surface 112, pivots the housing element 22, and the force that the torsion spring 99 the shaft 98 to the lever 110 the Spring 91 exerts on the lever 80, can by moving from the position according to FIG. 2 can be set in the position according to an adjusting screw 93, which can be pivoted in a 15 In this manner, the amount of tension in the loop L compressing the anvil 31 into the band may cause the pullout to the gripping wheel 30. The range to pivot the lever 80 preselected upward movement of the base 95 will be limited so that the strength of the loop L can be changed around the 20 by engaging the lower portion 96 α of the opening 96 pack P around as desired. in the base element 95 on the underside of a Before the further description of the means for guiding 68 α on the shaft section 68. The conversion of the intermittent rotary movement of the stood between the lower part 96 a and the Am shaft 55 into a reciprocating Movement forward 31 is such that a clearance is set between the means for inducing 25 wheel 30 and anvil 31 to maintain relative movement between the tape gripping wheel if lever 114 is released when there is no tape 30 and the anvil 31 for compressing which is present in the tool. After the tape-overlapping tape sections 28 and 29 has been closed, the lever 110 is written. In the present embodiment, the anvil 31 is pivoted upwards from the position according to FIG the stop surface 112 is movable again, and for this purpose the anvil 31 is to be brought into engagement with the hook 113 in order to the end of a vertically arranged base element 95 as an outwardly projecting plate on the lower anvil 31 in a position remote from the roller 30 lock so that the band portion 28 is formed from the. As is apparent from Fig. 2, the stock of tape separated and the tool an extended non-circular Öff- 35 pack P can be removed from the base member 95, as voltage later 96 which will be reasonable well above the shaft portion 68.

is arranged in order to give the base element 95 the possibility after the anvil 31 is assembled in the band.

to move relative to the shaft 55. The pressing relationship to the gripping wheel 30 has been moved. The means for moving the base member 95 has been moved and the predetermined amount of chip removed from the position shown in FIG. 2 in the position according to FIG. 4 40 opening in the tape loop L by the stepwise comprise a shaft 98 (Figs. 6 and 7), which has been generated in the rotation of the gripping wheel 30, housing elements 21 and 22 above the shaft 55, the lever 80 described above pivots from which is rotatably mounted. A torsion spring 99 surrounds the position according to FIG. 6 up to the position according to the shaft 98, and one end 100 of the spring 99 rests against FIG. 7, in order to actuate a pawl release element 120, the upper surface of the housing element 22, while the pawl release element 120 is the opposite end 101 for pivoting the spring 99 is attached to a transverse pin 121 at the bottom extending through the shaft 98 (FIG. 8), the end of the housing element 22 below the shaft 55 around the shaft 98 in a counterclockwise direction, and a helical spring 122 acts between FIG. 6 and 7 to load. An eccentric pin 102 see the lower right end of the pawl release member extends through the shaft 98, and one 50 ments 120 and the bottom of the housing member 22, end of the pin 102 extends from the housing to the pawl release member outwardly in counterclockwise direction 22 where to load it in a bore 102a device, as can be seen in FIGS. 6 and 7, at the upper end of the base element 95 is rotatable. The pawl release element 120 further comprises one; is stored. The base element 95 has an arm 103 bent on the inside towards the shoulder 123 near its left end, which extends from the contact with the upper surface of the finger 8 through an opening 104 to the housing element 22 through the spring 122 is pressed, and one extends inward, and the lower end of the arm 103 downwardly directed hook 124 outside the extension is provided with an inclined cam surface 105 (FIGS. 6 to 8) 123, which is held in place by the spring 122 a purpose that will become clear later. handle with an inwardly bent stop 12. Arm 103 functions as a blocking element which is depressed 60 on a pawl return lever 126, preventing reciprocating movement of the roller 30, as best seen in FIGS. 11 and 12

until the anvil 31 collapses into the band, the ratchet return lever 126 points outwardly Relationship with the gripping wheel directed fingers 127 and 128 to its opposite 30 has moved and up in the belt loop L a lowing ends, which in openings 129 and 130 ir Tension has been generated, as later also clearly shown in the housing elements 21 and 22 respectively will be borrowed. be, with these openings 129 and 130 over

A return lever 110 is dimensioned with a hub 111 (Fig. 12) to pivot movement of the shaft 98 between the base element 95 and the ratchet return lever 126 from the position according to FIG

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12 and 13 in the position according to FIG. 14, 20 protrudes outward through an opening 151. The possible. The lever 126 has an upward motor M can be switched on and off via a switch 152 in the directed section 132, which is arranged in such a way that the housing chamber 27 can be switched on and off, and that it can touch a pawl 140 in order to close it. the switch 152 is to be returned by a push button 153, and it also has an inclined 5 actuated, which through the surface of the housing to cam surface 133, which protrudes from the cam surface 105 above. The switch 152 is preferably such that it can be touched on the base element 95, if arranged, that as soon as the push button 153 moves the return lever 110 out of the position shown in FIG. 4 is pressed, the motor M, when energized, is moved to the position shown in FIG. 2 in order to rotate the shaft 33.
Pawl 140, as will be explained in the following, after the frictional fusion connection is established. has been set, the lever 110 is pivoted and

The pawl 140 is again brought into engagement with the locking lever 114 on a transverse pin, is pivotably arranged 141 and has a first one in order to restore the clearance between the wheel 30 and the arm 142 with a tooth at the end for engagement with the anvil 31. When the lever 110 is pivoted the teeth 66 of the ratchet wheel 64 and a second 15, the cam surface 105 moves to arm 143, which can touch the upwardly directed Ab- on the arm 103 in contact with the cam surface 133 section 132 of the lever 126. A spring on the return lever 126 to pivot the return lever of the 144 acts between a recess in the and to move the pawl 140 out of engagement with the ratchet arm 143 and a recess 145 in the ratchet wheel 64. The arm 103 and side wall of the rocker arm 50, around the pawl 140 20 of the lever 126 then work together to load the clockwise direction shown in FIG. Block pawl 140 and a back and forth thus when the anvil 31 has been raised, movement of the gripping wheel 30 to the next one will prevent the arm 103 on the base element 95 in the connecting process.
Position according to FIG. 7 moves, and the cam surface The tool 20 also has a cutting device

105 on the arm 103 is at a distance above that enables the upper strap to be easily and conveniently cut from the strap supply to the state for movement in loading - can be separated after bringing the frictional contact with the ratchet wheel 64. After fusion has been established. For this purpose, a tension has been generated in the tape loop L. If a knife 160 is at the outer end of the finist, the lever 80 is in the position according to FIG. 7 to 30 gers 85 of the lever 80, and this knife pivots to release the hook 124 from the stop 125 is, the lever 126 is in the position shown in FIG. 7, the curved surface 133 being inserted below the curved surface 105 31 when they are inserted between the gripping wheel 30 and the anvil, the cutting edge 161 being in the. Simultaneously with the movement of the lever 126 35, essentially parallel to the outer edge of the upper belt, the spring 144 pivots the pawl 140 around which the section28 runs. When the lever 80 is raised by the toothed arm 142 of the pawl with the tension in the loop L of tape, teeth 66 on the ratchet wheel 64 will engage the upper portion of the tape 28, which goes to the tape (Fig. 14), and this engagement prevents the supply from running at an angle to the length of the ratchet wheel 64 and shaft 55 in the counter clock 40 cutting edge 161 arranged. Then turn clockwise, as shown in Fig. 12-14. Locking lever 114 with the return lever 110 in BeWcgkupplung 75 works between the gripping wheel 30 and the anvil 31 so that the appropriate tension in the contact has thus been brought about a free space loop L, to prevent the to deliver, the tool 20 is only rotated clockwise towards the shaft 55, while the 45 th is pushed, as shown in FIG. 1 can be seen. and pawl 140 prevents shaft 55 from rotating rela-counterclockwise as a result of the inclination of upper band portion 28. Thus, when the tilting arm to the cutting edge 161 allows the movement lever 50 to continue its reciprocating movement, the tool relative to the tape loop that effectively locks the shaft 55 to the rocker arm, cutting edge 161, the upper tape section 28 and the tape gripping wheel 30 is easily separated from the tape supply at high frequency 50,
and low amplitude reciprocated by the The above-described tool is extremely upper band portion 28 penetrated in several directions and easily. The F i g. 2 and 3 are shown to be moved relative to the lower belt section 29. lungs of the tool approximately natural size, and the motor M is kept under power for a sufficient time, the total weight of the tool is below 2 kg, so that the movement of the upper belt section 28 is relatively low to the lower belt and the compact design of the tool, a section 29 provides enough heat for the users of the same to give each other the opportunity to use this "touching surface areas between the overlapping belt sections, which are easy to handle for longer periods of time, in order to without getting tired. In addition, the factory can achieve zen of these surfaces. While the tool 20 can be used at any point and the backward movement of the tape gripping wheel 30 acts where a corresponding alternating current source is placed to tension in the tape loop L on the overlap joint. In an exemplary embodiment the belt sections, and it is assumed that the form of the device rotates the motor M mi which improves the properties of the connection, which is approximately 18,000 rpm, and is ultimately established as a result of the direct drive. The motor M is connected to a 65 relationship between the motor M and the gripping wheel usually available 30 when the pawl 140 is connected to the ratchet wheel 64 eir power source via a line 150 that engages, the gripping wheel 30 moves with a Frequen through the rear end of the housing of the tool -on about 36,000 cycles per minute. The Gesanr

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amplitude of the reciprocating movement of the hand wheel moves, a movement with high frequency and is about 3.81 to 4.06 mm. As a result of the low time and low amplitude, span onto the tape gripping wheel 230, which is required to be brought to the friction melt. This latter movement causes Establish connection, a timer in the that the upper band portion 228 is relative to the Chamber 27 is provided and moved with the switch 152 5 lower belt section 229, while the are connected to compress the entire length of the pre-overlapping tape sections Gears of generating the tension and the friction are held, and the inner surface areas merge to control. of the overlapping tape sections are through the

A modified version of the tool is friction heated, which is generated until a verin Fig. 15 to 17 shown, and as this version occurs io melt. After the fused surface areas in many points of the previously described embodiment areas have solidified in order to be similar or equal, lapping tape sections in FIG correspond to the embodiment described in the tape, the same stock separated by a cutting device, as reference numerals are used, but the number 200 15 is best seen in FIGS.
are increased. The cutting device of the embodiment

In some cases it is desirable that Figures 15-17 differ substantially the tape from the tape supply to the user from the cutter of the previously described of the tool, since that is the handling execution, since the upper band portion 228 of of the tool and the production of the connection 20 is separated from the tape supply, in particular in dependency relieved. Therefore, the movement of a lock lever 314 in FIG 15 to 17 certain elements of the position according to FIG. 15, which are determined by the dash-dot drive arrangement in the housing of the tool line »cutting« is shown. The lever 314 has 220 is a mirror image of the previously described con a curved curved surface 370, which with a Structure arranged so that the tape gripping wheel 230 25 stop 371 on a cutting element 372 in leg Is rotated counterclockwise, as it can be brought into touch, on a base element 15 can be seen pivotally attached about the upper end portion 295 by means of a pin 373 228 of the tape is back to the user of the tool. The base 295 has a retracted shape and the loop of tape into tightly fitting flange portion 374 which is substantially Binding contact with the package 30 to be bound parallel to the main part of the base element 295 to contract. runs, and the pin 373 penetrates a bore

As in the previously described embodiment in the flange portion 374 and an aligned form is a block 242 (FIG. 16) sliding on a bore in the main part of base 295. eccentric pin 240 of a motor driven an anvil 231 has a raised portion

Sleeve 237 arranged. The block 242 is also located along the 35 375 that coincides with the base 295 a transverse pin 243 slidable, operates to dader a tape take-up guide 377 to form a transverse bore 244 in the block 242 between them. The upper surface of the raised sets, and a rocker arm 250 is with the pin 243 section 375 forms a measuring surface by a over arms, such as B. an arm 251, connected, web on the cutting element 372 is touched, as so that the rocker arm 250 is reciprocated, 40 it will be clear below. The top surface of the when the sleeve 237 rotates. elevated section 375 is a distance above

The tape gripping wheel 230 is arranged in the loop span of the guide 377 of the anvil, the direction of which corresponds stepwise via a one-way clutch 275 to the thickness of the tape. A cutting edge driven by teeth 276 on the rocker arm 382 is provided at the lower end of the cutting element 372 250 and received between these teeth 276, and a flat web 383 has from which rollers 277 can be formed. The over-cutting edge 382 is spaced apart. The web 383 of lapping tape sections 228 and 229 are both in contact with the measuring surface at the upper end below the tension sensing finger 285 of a lever of the raised portion 375 of the anvil moveable-280, and at a predetermined bar when the cutting element 372 is in tape severing tension has been created in the tape loop, 50 with respect to the anvil 231 by the lever 314, the lever 280 is pivoted upwards to be moved. The lower edge of the cutting edge 382 ratchet release element 320 against a pin 321 lies in the same plane as the web 383, so that the load of a spring 322 pivots around when the web 383 touches the measuring surface on the anvil 231 a hook 324 on the release element 320 touched by one, the cutting edge 382 separates the upper tape stop 325 on a pawl return lever 326 to 55 section 228 . Free an extension 379. extends transversely from the cutting edge 382

A pawl 340 is above the rocker arm 250 on the outside and slides in a recess 380 in the dei and on one side thereof, as it is in the side wall of the base element 295, the Ver-Fig. 16 can be seen, and when the lever 326 extension 379 ensures that the cutting edge 382 pivots, a spring 344 urges a 60 cut cleanly through the tape. The toothed arm 342 of the pawl 340 engaging the cutting element 372 is preferably heavy-duty with teeth 266 on a ratchet wheel 264. When force is applied to the one shown in FIG. 15 brought the pawl 340 into engagement with the ratchet wheel 264 , although springs could also be provided, a rotation of the tape gripping wheel 230 in the tensioning direction about the cutting element back in this position is prevented, and the ratchet mechanism 65 is guided. The raised section 375 of the anvil! Mechanism works in conjunction with the one-way clutch 275 to protect the cutting edge 382 from damage to hold a shaft 255 from rotating in the event that the cutting element 372 is actuated, such as when the rocker arm 250 is wedged back and forth in the tool is available.

For this purpose 3 sheets of drawings

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Claims (14)

Patent claims: 1. Device for joining by friction welding a loop around a Object looped thermoplastic tape with attached to a housing the overlapping tape ends between clamped transversely to the clamping direction relative to each other movable clamping members, one of which can be driven by a motor to perform an oscillating movement and is designed to be rotatable as a profiled roller, characterized in that the roller (30; 230) only intermittently in one direction via its motor drive (40,50,55,75; 240) can be rotated until a predetermined voltage is scanned by a voltage sensor (80, 64, 140; 280) connected to the motor drive Tension in the thermoplastic tape (L) is reached and only then to the back and the accompanying oscillating movement can be driven with frictional contact of the tape ends (28, 29). 2. Apparatus according to claim 1, characterized in that the response voltage of the Voltage sensor (80, 64, 140; 280) is adjustable. 3. Apparatus according to claim 1, characterized in that for the rotary drive of the roller (30; 230) an electric motor (M) is provided. 4. Apparatus according to claim 3, characterized in that the shaft (33) of the electric motor (M) is connected via an eccentric (40; 240) to a rocker arm (50; 250) between and the roller (30; 230) a one-way clutch (75; 275) is switched on. 5. Apparatus according to claim 1 or 4, characterized in that the roller (30; 230) to maintain their unidirectional rotation with a ratchet mechanism (64, 140; 264, 340) is provided. 6. Apparatus according to claim 5, characterized in that the ratchet mechanism a ratchet wheel (64; 264) and a pawl (140; 340) which by a locking device (126; 326) is held out of engagement with the ratchet wheel, and that in addition one the locking device (126; 326) when the response voltage of the voltage sensor (80; 280) is reached, releasing device (120) is provided. 7. Apparatus according to claim 6, characterized in that the voltage sensor is a lever (80; 280) in contact with the looped tape (L), and that the release device is pivotably arranged on the locking device (126; 326) Approach (120; 320) is that touches the lever (80; 280). 8. Apparatus according to claim 7, characterized in that the roller (30, 230) on a Shaft (55; 255) is arranged, which also carries the ratchet wheel (64; 264) that the pivotable arranged pawl (140; 340) held by a spring (144; 344) in engagement with the ratchet wheel is that with the pawl a slide (126; 326) is in contact and that the slide (126; 326) and the pivotable extension (120; 320) together form the locking device form. 9. Apparatus according to claim 8, characterized in that that for moving the pawl out of engagement with the ratchet wheel a device (31, 103,105,126; 231) is provided, which is normally a movably arranged anvil (31; 231), which has a curved surface (103) on a corresponding curved surface (133) of the Slide (126; 326) is applied. 10. Apparatus according to claim 9, characterized in that a device (98,102,110; 302, 310) for moving the anvil (31; 231) towards the roller (30; 230) or away from it is provided. 11. The device according to claim 10, characterized in that the anvil displacement device a shaft (98; 298) having an eccentric (102; 302) and with a torsion spring (99, 99, 299) is in contact, and that the anvil (31; 231) by a locking device (114: 314) is releasably held out of engagement with the roller (30; 230). 1? .. Device according to claim 11, characterized in that the anvil displacement device the anvil against the force of the torsion spring (99; 299) out of engagement with the roller (30; 230) moving lever (110; 310) which is connected to the shaft (98; 298) and a stop (112; 312) that with the lock! means (114; 314) can be brought into engagement is. 13. Performing according to claim 1, characterized in that the belt (L) during the Tensioning of the loop by the motor drive (240) can be pushed against a handle is. 14. The device according to claim 1, characterized in that the tape (L) during the Tensioning of the loop by the motor drive (40) can be pushed forward by a handle is.