JPH0116723B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention involves wrapping and tightening a ring of thermoplastic webbing around a package or other article, and then sealing the overlapped portions of the webbing by friction welding. automatic for,
Concerning self-contained lacing tools.

BACKGROUND OF THE INVENTION A number of lanyard tools have been developed that friction weld the ends of thermoplastic webbing around a load.

See the following U.S. patents: No. 3442732 to Stensaker et al., No. 3442733 to Vilcins, No. 3442735 to Stensaker, No. 3442735 to Billett et al.
3554845, No. 3586572 to Ericsson
No. 3709758 to Gilmore, and No. 4001064 to Nix. Additionally, tools have been developed for frictionally welding two plastic sheets together. An example of such a tool is disclosed in US Pat. No. 3,586,590 to Brenneisen.

[Problem to be solved by the invention] Despite the fact that some of the inventions disclosed in the above-mentioned patents have been embodied in commercially available products, it is still difficult to tighten the webbing. Fusion welding must be started manually afterwards, and since the motor rotates only in one direction, the tightening mechanism and press fusion welding mechanism must be equipped with complex drive mechanisms, which increases the weight and shape of the tool. It has drawbacks such as increased tightening and inability to perform effective tightening.

The present invention automatically switches from the webbing tightening process to the press fusion welding process, and also realizes a tightening mechanism and press fusion welding mechanism that do not require a complicated drive mechanism, and can be used with easy operation. The purpose is to provide a lightweight and compact tool.

[Means for Solving the Problems] To perform these operations, the tool is first rotated in a first direction to tension the webbing and then rotated in a direction opposite to the first direction to effect friction welding. a motor device that rotates in a second direction and performs reversible rotation; and a drive shaft device coupled to the reversible rotation motor device and sequentially driven to the first and second rotations. When the shaft device is rotated in a first direction, the webbing tensioning device engages and thereby tightens the webbing, and when the drive shaft device is rotated in a second direction, the tightening device is removed from the drive shaft device. a driveshaft device having a first clutch device for disengaging and thereby stopping rotation of the tightening device; and a motor device for sensing a predetermined tension level in the webbing loop to be tightened and responsive to the sensing. a sensing control device for reversing the rotation of the overlapping band; and a member actuating device for compressing and welding the overlap bands, the member actuating device configured to reverse the rotation of the overlap band when the drive shaft device is rotated in a first direction of rotation. a member actuating device comprising a second clutch device for releasing the press fusion welding to the webbing portion and causing a press fusion welding operation of the member actuating device when the drive shaft device is rotated in a second direction; and .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS AND OPERATIONS Referring now in detail to the drawings, the tool of the present invention is illustrated in FIG. 1 in its entirety at 20 and is shown sitting on a load P, which It is shown with a loop of webbing S having a surrounding and first or overlapping webbing portion U and a second or lower overlapping webbing portion L passing through the tool. The upper or first overlapping webbing portion U may emanate from a suitable supply reel, not shown. Since the upper webbing portion U extends beyond the second or lower overlapping webbing portion L, it can be said to include the fixing or tail portion T of the webbing S.

The main frame structure of the tool 20 includes a sealer housing 28 with a base 30, a gear box 32 (second
), a motor enclosure 34 secured to the sealer housing 28 with bolts 35, a handle assembly 36,
and associated supporting and connecting pieces. The frame structure and housing may include a number of parts, walls, and plates that fit together and are connected by suitable devices such as bolts and/or screws. This frame and housing piece should be inspected and/or
or tools 20 for periodic maintenance of the mechanism therein.
Preferably, it is easily removed to gain access to certain internal parts of the device.

In operation, the tool 20 is applied to a webbing ring that has already been made by inserting the overlapping parts U and L of the webbing ring into the tool 0 as shown in FIG. The tool 20 then acts to tighten the webbing loop around the load P and tension it to a predetermined tension level, whereupon the tool 20 then automatically cuts the tail T of the webbing S from the loop and cuts the overlapping webbing loop. Join U and L by friction welding.

Motor and Drive Shaft Assembly Referring now to FIGS. 1, 2, 8 and 9, a novel motor and shaft assembly will now be described. A reversible electric motor 40 is mounted within the motor housing 34 by suitable bolts 36 (FIG. 8). The motor 40 is a rotating electric motor supported at one end in a bearing 44 (FIG. 1) in the motor housing 34 and at the other end in a bearing 46 (FIG. 8) mounted in a wall 330 of the sealer housing 28. child and shaft assembly 42. A cooling fan 48 is mounted on the armature shaft 42 just inside the bearing 46. Power to the motor is introduced through motor housing 34 by electrical cord 50 (FIG. 1).

Referring now to FIG. 9, the motor armature and shaft assembly 42 rotates about the longitudinal axis of the armature shaft 42 and includes a first drive shaft assembly or first drive shaft 60 defining a receiving hole 64 at one end. It is seen that it contains.

The second shaft 70 has one end mounted within the receiving hole 64 of the first shaft 60 and has a suitable needle bearing 72.
and 74 for rotation about a first axis. In front of the needle bearing 72 (to the left of the needle bearing 72 as viewed in Figure 9) a rubber grease seal 84 may be used to protect the bearing.

A pair of one-way clutches 76 and 78 are connected to the first shaft 6
0 and the second shaft 70 in two needle bearings 72 and 74 in an annular region formed between the second shaft 70 and the second shaft 70 . The drive portion of each clutch 76 and 78 is mounted to the first shaft 60 for rotation therewith. During tensioning of the strap ring, one-way clutch mechanisms 76 and 78 permit first shaft 60 to drive second shaft 70 in a first direction of rotation. However, this clutch is the first during friction welding of the overlapping webbing sections.
The shaft 60 is rotated in a second opposite direction, but the second shaft 70 is not rotated in the second direction.

The two clutches 76 and 78 are embodied solely for the purpose of power transmission capability. A single clutch with sufficient load transfer capability can also be used.

having the form of a plurality of inwardly directed clutch teeth which surround a cylindrical roller therebetween and where the teeth freely rotate the first shaft 60 in one direction; This clutch 76 may be any suitable one-way clutch mechanism of the type that couples the rollers internally to the second shaft 70, thereby causing both shafts to rotate together when the first shaft 60 rotates in the opposite direction.
and 78 may be used. Such clutch mechanisms are of well known and common design and no further explanation or illustration of such clutch mechanisms is necessary.

The portion of the second shaft 70 projecting from the first shaft 60 passes through a suitable support wall 86 associated with the housing or frame of the tool. This support wall 86 has a one-way clutch 88 that connects clutches 76 and 7.
8 but in the opposite direction to ensure that rotation of the shaft 70 relative to the support wall 86 and thus relative to the first shaft 60 in the direction of the second axis is prevented. A grease seal 90 is provided between the first shaft 60 and the clutch 88 and is retained within the support wall 86.

At the distal end of the second shaft 70 and integral therewith is a drive pinion gear 92 . This drive pinion gear 92
is actuated to actuate a mechanism for tightening the webbing to a predetermined tension level via a transmission device to be described hereinafter.

Transmission Gearing and Pull Wheels Referring now specifically to FIGS. 2 and 8, drive pinion gear 92 is seen projecting into gear housing 32, which housing has one end supported by roller bearing assembly 102. It houses a gear transmission including a shaft 100 whose other end is mounted within gear housing 32 by a roller bearing assembly 104 . The ring gear 106 is connected to the shaft 10
0 and is engaged with drive pinion gear 92 for rotation therewith. Another thing attached to the shaft 100 is a worm gear 108.

Another shaft 112 extends across gear housing 32 and is generally perpendicular to shaft 100 and is mounted at one end by a ball bearing assembly 114. Gear 120 is mounted to shaft 112 for rotation therewith and is engaged with worm gear 108 . The gear 120 has a reduced diameter section 122 mounted within a bearing 124 at one end of the gear housing 32.

The shaft 112 projects from the gear housing 32 (to the right as viewed in FIG. 2) and has a pull wheel 126 that extends out of the gear housing 32 and is keyed therein for rotation with the shaft 112. Referring to FIGS. 1, 2, 3, and 4, this pulling wheel 126 is rotated by the motor 40, so that the first shaft 60 and the second shaft 70 are rotated in a first direction (shaft 70 is rotated clockwise in FIG. 2). do)
It should be noted that during the tightening or tensioning phase the ring rotates counterclockwise. This is the first
Looking at the diagram, pull the overlapping webbing part U to the right with the ring S
Tighten to add tension to the ring.

Tension Sensing Mechanism Referring to Figures 3, 4 and 8, tension arm 1
30 is shown rotatably mounted about a shaft 132, which shaft 132 is attached at both ends to the tool housing. This tension arm 13
0 is the lower arm 14 extending to the side of the pulling wheel 126
0 and an upper arm 142 extending above the pull wheel 126
has. Lower arm 1 of this tension arm 130
40 has an anvil adapted to come into contact with the lower strap portion L, as shown in FIG.

Upper arm 142 of tension arm 130 has a tension sensitive limit switch 150 having a contact member 152 projecting upwardly from arm 142.

The tension sensing switch 150 is part of a control circuit (not shown) which directs the rotation of the motor in a first direction (during which the tension wheel 126 is associated with an electric motor 40 for reversing in a second opposite direction (counterclockwise as viewed in FIG. 1) to tension the webbing loop.

As best illustrated in FIG. 8, a spring plate 154 having a generally L-shaped configuration is attached to the top of the upper arm 142, and the underside of the spring plate 154 just contacts the switch contact member 152, but the switch is not in contact with the switch. The contact members 152 are bent outwardly as best shown in FIG. The spring plate 154 is attached to the upper arm 142 by suitable screws 156 and 158.

A roller 160 is mounted at the distal end of the upper arm 142 for rotation about an axis 162 supported by the upper arm 142.

Tension arm 130 is secured to its mounting axis 132 by torsion spring 166, as seen in FIG.
The torsion spring 166 is biased counterclockwise around the periphery of the ear 1 with one end protruding from the tool housing.
68 , the other end is attached to an ear 170 that projects from the upper arm 142 . Under the driving force of the spring 166, the tension arm 130 rotates and pulls the overlapping strap portions U and L onto the tension wheel 126 as shown in FIG.
to press against. During the pulling sequence, pulling wheel 1
26 is rotated counterclockwise, as viewed in FIG. 1, and the overlapping webbing portion U is grabbed by the pull wheel 126 and moved or pulled to the right (as viewed in FIG. 1) to remove the webbing. Tighten the ring S and stretch the ring around the cargo P.

Because of the relative positions of tension arm shaft 132 and tension axle 112, tension arm 10 is self-energized during the tension process to rotate further counterclockwise about shaft 132 and against overlapping webbing sections U and L. and press with increased force. As the overlapping strap sections U and L are squeezed together between the anvil 146 and the pull wheel 126 during the tensioning process, the strap sections U and L are compressed to some extent, which causes the tension arm 130 to
Rotate counterclockwise again for the second rotation. In addition, it is preferable that the anvil 146 has a plurality of teeth (not shown) that overlap to some extent and grip and bite the lower surface of the webbing portion L. As the tension level increases, the teeth on the anvil 146 penetrate further into the lower webbing portion L.

This compression and biting of the webbing by the anvil 146, of course, helps to prevent the tension wheel 126 from slipping with respect to the upper webbing portion U. However, this action has the effect of further rotating arm 130 about axis 132 to move upper arm 142 and switch 150. For this purpose, an abutment device such as a set screw 180 is provided in the tool housing above the switch 150. When a predetermined tension level is reached, the compression level of the overlapping strap portions U and L and the extent to which the anvil teeth bite into the lower strap portion L are adjusted as shown in FIG. 152 against set screw 180 is sufficient to actuate switch 150. When the tension is below a predetermined tension level, the amount of compression of the overlapping webbing portion and the degree of biting of the anvil teeth into the lower webbing portion L are controlled by the switch 150 and the set screw 180.
It is not enough to activate the switch.

The predetermined tension level can be varied by adjusting the set screw 180. When set screw 180 is adjusted to protrude closer to switch 150 as shown in FIG. 3, the level of tension at which switch 150 is actuated is clearly reduced. Conversely, if set screw 180 is adjusted farther from switch 150 than shown in FIG. 3, the level of tension at which switch 150 operates will increase.

Spring plate 154 is mounted in the position shown in FIG. 3 and is not intended to be adjustable. This spring plate 154 simply serves to absorb the impact energy exerted on the switch actuating member 152 and thus on the switch 150 when the strap ring S breaks during the tensioning process.

An actuation lever assembly 184 is provided to swing the tension arm 130 away from the pull wheel 126 to allow the overlapping webbing sections U and L to be inserted between the anvil 146 and the pull wheel 126. The actuation lever assembly 184 includes an actuation lever 186 as best shown in FIG.
and an actuation lever cam 188 having a cam surface 189 adapted to engage the roller 160 at the distal end of the upper arm 142 of the tension arm 130 .

The actuation lever assembly 184 is mounted about an axis 190 for rotation with respect to the tool frame. Actuation lever assembly 184 is biased upwardly (counterclockwise about shaft 190 as viewed in FIGS. 1, 3, and 4) by a torsion spring 194 wrapped around shaft 190. One end 196 of torsion spring 194 is clamped relative to the tool housing, and the other end 198 is secured to hole 200 in lever cam 188.
1 to drive actuating lever assembly 184 counterclockwise as viewed in FIG.

In the uppermost position, the actuating lever assembly 184 leaves contact with the tension arm roller 160 and the tension arm 130 is attached to the overlapping webbing section U as shown in FIG.
and L freely against the pull wheel 126. When this tool operator pushes down on the actuating lever 186, the cam surface 189 of the actuating lever cam 188 moves against the roller 16.
0 and drives the tension arm 130 clockwise around the axis 132 to move the anvil 146 to the tension wheel 126.
This allows the overlapping strap parts U and L to be inserted between them as shown in FIG.

Welding Grip Pad and Oscillating Drive After the webbing ring is tightened around the load P and tensioned to a predetermined tension level, the rotation of the motor 40 is reversed and the welding member such as the upper grip pad 206 or grip weld Because the member is pressed against the upper surface of the overlapping webbing section U and the upper webbing section U is rapidly moved relative to the lower webbing section L as best shown in Figures 4, 6, 9 and 10. be swayed. In particular, as best illustrated in FIGS. 5 and 10, the upper grip pad 20
6 is arranged on the overlapping strap parts U and L. The pad 206 is movable between an upper position, shown in FIGS. 3 and 5, in which it does not contact the upper strap portion U, and a lower position, shown in FIGS. 4 and 7, in which it contacts the upper strap portion U. In the lower position shown in FIGS. 4 and 7, the upper gripper pad 206 forces the upper strap portion U against the lower strap portion L.

Upper gripper pad 206 preferably has a serrated strap engaging surface or a plurality of teeth that grip the upper surface of overlapping strap portion U. The gripper member 206 is attached to or integral with a frame 212, which is attached at one end to or integral with a ring 214. This ring 214 is arranged around the first shaft 60. Preferably, needle bearing 216 is press fit inside ring 214 to facilitate rotation of the ring about axis 60.

Referring to FIGS. 9 and 10, the shaft 60 is
0, is seen to have a small diameter eccentric portion presenting an entirely cylindrical drive surface 220 disposed around a longitudinal axis parallel to, but displaced from, the coincident longitudinal axes of the receiving hole 64 and the second shaft 70. Therefore, as shaft 60 rotates, drive ring 214 is carried in a circular orbit around the longitudinal axis of shaft 60. The ring 214 and the bearing 216 attached to the ring 214 are connected to the shaft 6.
Due to the fact that the frame 212 and upper gripper pad 206 can be maintained in the relative positions shown in FIGS. 5 and 6, as shown by the double-headed arrow 226 in FIGS. is subjected to a rocking motion in a direction transverse to the length of the strap parts U and L.

Pad 206 that crosses overlapping strap parts U and L
The oscillation occurs when the motor 40 is in the first position in the tension sequence.
(clockwise as shown by arrow 228 in FIG. 5) and the gripper pad 206 is in the upper position and not engaged with the overlapped webbing portion, the motor 40 is rotated in the second direction in the webbing sequence. It should be noted that the same occurs when the upper grip pad 206 is turned (counterclockwise as shown by arrow 230 in FIG. 7) and pressed against the overlapping strap sections U and L. .

As shown in FIGS. 9 and 10, counterweights 227 are mounted on the fan assembly and rotate 180 degrees out of phase with respect to the highest point of eccentric portion 220 of drive shaft 60. This provides an overall balanced assembly.

Webbing strap pressing mechanism Second direction of first axis 60 (during welding sequence)
A device or mechanism responsive to rotation of at least one of the overlapping strap sections for pressing the overlapping strap sections together and for friction welding the overlapping sections once the strap ring has been tightened to a predetermined tension level. It is provided to move the webbing relative to other strap parts.

In particular, with respect to FIGS. 4, 5, 7, and 8, the biasing device or mechanism is seen to include a biasing member or upper grip pad 206 adapted to contact the upper surface of the overlapping webbing section U. The upper gripper pod 206 connects a pair of first links 302 and 304 and a locking arm 306 between a first upper position where it does not contact the overlapping strap portion U and a second lower grip position where it contacts the overlapping strap portion U. It is moved by a linkage system that includes. The links 302 and 304 are rotatably coupled at their lower ends to upper gripper pad 206 by pin 308 and to rocker arm 306 at their upper ends by pin 310.

The rocker arm 306 has a first end 309, a second end 311, and one end is rotatable in a receiving hole 314 in the wall 324 of the gear housing 32, and the other end is rotatable in the receiving hole 316 in the wall 329 of the motor housing 34. It has an integral shaft 312 attached thereto. A pair of torsion springs, namely the left rocker arm torsion spring 318
and the right rocker arm torsion spring 320 is attached to the shaft 312
The shaft is mounted around the periphery of the shaft in order to shift the shaft in the clockwise direction as seen in FIGS. 5 and 6. For this reason, spring 318
is the end 3 engaged with the wall 324 of the gear housing.
22 and another end 326 engaged with rocker arm first end 309 . Similarly, the right rocker arm torsion spring 320 is attached to the wall 3 of the motor housing.
29 and the other end 332 engages the rocker arm second end 311. In this way, the rocker arm 306 is
The pair of links 302 and 304 are continuously biased downwardly to force the upper gripper member 206 against the upper surface of the overlying webbing portion U as shown.

As best shown in FIG. 5, an opening pawl 336 is rotatable about a pin 338 in the wall 330 of the sealer housing 28 to hold the locker arm 306 against the biasing torque of springs 318 and 320. installed. To this end, the locker arm 306 has an outwardly projecting short leg 340 on the locker arm first end 309 , the opening pawl 336 receives the leg 340 and the locker arm 30
6 in the position shown in FIG.
Notch 34 to act as a latching device to engage locker arm 306 to hold locker arm 306 in a first up position where it does not engage the webbing.
2 (best illustrated in FIG. 7). An opening pawl spring 344 is provided and engages the opening pawl 336 and the wall of the sealer housing 28 to hold the opening pawl 336 in the position shown in FIG. a second end 348 secured to section 330;
(best seen in Figure 8). In this manner, spring 344 causes opening pawl 336 to
It engages locker arm 306 by driving it circumferentially in a counterclockwise direction (as viewed in FIG. 5).

The release pawl 336 is rotated clockwise (as viewed in FIG. 7) around the shaft 338 by a release ring 350 disposed around the shaft 60 to release the locking arm 306.
Release and leave. As best shown in FIGS. 10 and 11, a release ring clutch 354 is connected to shaft 60.
and the release ring 350. This clutch 354 is a one-way clutch 76 between the first shaft 60 and the second shaft 70 previously shown and described in FIG.
and a one-way clutch similar to 78.

Referring to FIG. 11, this one-way clutch 3
54 includes a sheath drive member 358 having a plurality of roller pins 356 and teeth 360 to move release ring 350 in a counterclockwise direction when first shaft 60 is rotated in a counterclockwise direction (as shown by arrow 362 in FIG. 11). The driven clutch member 358 also rotates around this first shaft 60.
It can be seen that the roller 356 is restrained so as to rotate counterclockwise at the same time.

This release ring clutch 3 is rotated when the motor 40 and shaft 60 are rotated in a first direction (clockwise as shown by arrow 228 in FIG. 5) to tighten the strap ring.
54 separates the release ring 350 from the drive shaft 60, and the drive shaft 60 rotates in its first direction without rotating the release ring 350.

Release ring 350 connects walls or protrusions 376 and 3
forming a circumferentially interrupted groove or a pair of circumferential grooves 372 and 374 separated by 78; The opening pawl 336 is adapted to engage one of the projections 376 and 378 by a plunger 380 projecting downwardly from the opening pawl 336. This plunger 380 has a hole 3 in the opening pawl 336.
It is received at the lower end of 82. Plug 384 is held in the upper end of hole 382 by a press fit. The compression spring 386 pushes the plunger 380 into the release ring 3
The plug 384 is positioned between the plug 384 and the top of the plunger 380 in the hole 382 for biasing downwardly into one of the grooves 372 and 374 made in the bore 382 . This plunger hole and spring structure cooperate with a tool reset mechanism in a manner described below under the heading ``Reset Mechanism.''

Referring to FIG. 5, as motor 40 rotates shaft 60 clockwise as indicated by arrow 228 to tighten and tension the strap loop, release ring 350 is rotated clockwise as indicated by arrow 228, so that release ring 350 is not engaged in that direction of rotation. It is not driven by. Once some rotational frictional force is transmitted from the drive shaft 60 through the clutch device 354 to the release ring 350, the release ring 350 is rotated clockwise until a projection, e.g. 376, abuts a downwardly projecting plunger 380. Maybe. However, since the clutch does not engage the release ring 350 to drive it,
The protrusion 376 only lightly hits the plunger 380, thus allowing the drive shaft 60 to continue rotating but stopping the release ring 350 from further rotation.

When the strap ring S is tightened around the load P and the motor is reversed to begin the welding sequence, the shaft 60 rotates counterclockwise as shown by arrow 362 in FIG. now open ring 350
Clutch 354 , which engages drive shaft 60 , causes release ring 350 to rotate counterclockwise with drive shaft 60 to bring one of the protrusions, e.g. 378 , into contact with the side of plunger 380 . Because only the sides of the plunger 380 contact the protrusion 378, the plunger is not pushed upwardly into the hole 382 of the pawl 336, but laterally out of the open ring groove 372.
This causes the opening pawl 336 to overcome the biasing force of the torsion spring 344 and rotate clockwise around the shaft 338, thereby removing the locker arm leg 340 from the opening pawl latching device or notch 342. Upon disengagement from release pawl 336, locker arm 306 is rotated by torsion springs 318 and 320 (clockwise as viewed in FIG. 7) about shaft 312 to force upper gripper member 206 against the overlapping strap portion.

The release pawl 336 is attached to the release ring 35 which is still being rotated by the unlatched locker arm 306.
It is maintained so that it does not come in contact with 0. To this end, the opening pawl 336 has a cam surface 338 against which the rocker arm leg 340 slides to its uppermost position (FIG. 7).

This camming surface 388 of the opening pawl 336 thus engages the rocker arm leg 340 to hold the opening pawl outward against the biasing force of the torsion spring 344 and to rotate the opening pawl plunger 380. the release ring 350.

Although only one release ring protrusion may be required, two release ring protrusions 376 and 3 are provided for balance since the release ring 350 rotates in the second direction with the drive shaft 60 during the webbing sequence.
78 are provided.

It is noted that gripper member 206, which is mounted on an oscillating drive ring 214 on drive shaft 60, continuously reciprocates transversely to the length of the webbing, as shown by arrow 226 in FIG. It should be remembered. As the overlapping strap sections U and L are pressed together by the reciprocating upper gripper pad 206, the strap sections are friction welded together to form a webbing joint.

Referring to FIG. 7, the upper gripper pad 20
As 6 reciprocates in the direction of arrow 226, it is also seen to be tilted upwardly with respect to the plane of the webbing by the action of rocker ring 214. To accommodate this slight tilting effect of the upper gripper pad 206, and to ensure that the strap portions are pressed together with relatively uniform pressure, the movable lower gripper pad 400 is attached to the strap portions U and L.
It is located below. The pad 400 has a serrated or toothed surface (not shown) adapted to contact the lower surface of the lower overlapping webbing portion L. The lower grip pad 400 is mounted within a notch 401 in the base 30 of the tool 20 over a resilient support pad 402. The support pad 402 is preferably made of 50 durometer urethane.
Therefore, when the upper gripper pad 206 is tilted slightly upwardly by the action of the rocker ring 214, the elastic pad 402
06 to form a complete sandwich structure with the overlapping strap sections U and L and the lower grip pad 400.

Strap Cutting Mechanism As best shown in FIGS. 5, 6, 7, 8, 9 and 10, a saw blade 410 is provided just behind the lower gripper pad 400. As best shown in FIGS. 5 and 7, the saw blade 410 is rotatably mounted to the tool housing about a pin 412 and is in contact with the underside of the overlapping webbing section U and The strap section has a plurality of upwardly projecting serrations 414 adapted to sever the upper strap section when the strap section is pressed downwardly against the lower strap section L by the upper gripper member 206 at the beginning of a welding sequence. . Therefore, when the webbing loop is formed around the package P and the overlapping webbing sections U and L are placed in the machine as shown in FIG. An overlapping webbing portion L is placed over the top of the saw blade 410, while a lower overlapping webbing portion L is placed below the saw blade 410.

The saw blade 410 is attached to the pin 41 so that it can slide forward or backward parallel to the axis 60 with respect to the upper and lower gripper pads 206 and 400, respectively.
It is preferable that it be attached to 2. The saw blade 410 forms a notch 420 (FIG. 4) in the frame member 2.
Upper gripper pad 206 by extension of 12
The notch 420 is maintained in a given position opening to the
A rear portion 422 of the saw blade 410 is slidably disposed within. Therefore, frame 212 (and upper gripper pad 206) can swing relative to saw blade 410 in the direction of arrow 226 (FIGS. 5 and 6). However, any movement of the frame 212 forward or backward within the tool will carry the saw blade 410 forward or backward with the frame 212.

Reset Mechanism After the overlapping strap sections have been sealed together by friction welding, this tool removes the sealed strap loop and repositions another strap loop around the same load or around a different load. To be ready for use in tightening and sealing, the upper grip pad 206 can be reset to a first elevated position out of contact with the overlapping webbing.

As shown in FIGS. 4 and 5, the actuation lever cam 188 of the actuation lever assembly 184 is adapted to actuate a reset link 450 that engages the rocker arm 306. Referring to FIG. 4, the actuation lever cam 188 is in its normal spring biased position out of contact with the tension arm 130 whenever the overlapping webbing sections U and L are joined by friction welding. It can be seen in the. Actuation lever cam 188 defines an arcuate guide groove 454 for receiving L-shaped upper end 455 of link 450 .

This link 450 is C-shaped as best shown in FIGS. 7 and 8 and has another end 456 that engages the first end 309 of the rocker arm.
has. In particular, the first end 309 of the rocker arm 306 has an extension 460 that defines a hole 462 through which the link end 456 passes, thereby securing the link 450 to the rocker arm 306.

When the rocker arm 306 is in the position shown in FIG. 7 during the friction welding sequence, the reset link 450 is driven by the rocker arm 306 to its uppermost position and the upper end 455 (FIG. 4) of the link 450 is located in the actuation lever guide groove 454. located near the top of the mountain. Actuation lever assembly 184 is, of course, normally offset upwardly so that it is not in contact with tension arm roller 160, as shown in FIG.

After the friction welding is complete and the motor is de-energized, the tool can be removed from the sealed webbing loop by pushing the actuation lever 186 downward. This swings the anvil 146 away from the pull wheel 126 and causes the reset link 450 to be driven downwardly in the direction of arrow 466 in FIG. urge

The opening pawl 336 rotates back and locks the rocker arm 3.
Since it engages with the leg 340 on 06, the plunger 3
80 is the groove 372 or 374 of the release ring 350
(Figure 11). Since the motor is not energized, release ring 350 and shaft 60 have stopped rotating. Release ring projections 376 and 378
(FIG. 11) can take any position. If one of the protrusions were to stop just below the point where plunger 380 drops into release ring groove 372 or 374, plunger 380 would hit that protrusion. However, the compression spring 386 is designed such that when the opening pawl 336 rotates counterclockwise around the shaft 338 under the biasing force of the torsion spring 344, the plunger 380 can be pushed upwardly by the protrusion. . This occurs when the tool is reset by downward movement of link 350 in response to downward movement of actuation lever assembly 184.
always descends into its normal latching position where it engages the leg on the rocker arm 306.

Tension arm 13 for releasing the overlapping webbing section
Since downward movement of the actuating lever assembly 184 is required to rotate the 0 away from the pull wheel 126, the tool will automatically reset whenever it is removed from the sealed webbing loop. can be seen.

When the tool next engages the overlapping strap section of a new strap loop (as shown in FIG. It is biased counterclockwise around the shaft 190 by a spring 194 so as to take the shape. The length and shape of the guide groove 454 is such that the reset link 450 is in contact with the cam portion 18 during the tensioning process.
8 to prevent it from being pulled upward.
Therefore, link 450 exerts no force on rocker arm 306.

As best shown in FIG. 2, a convenient momentary contact button 500 is provided on the side of the tool housing for actuating a contact member 502 of a cycle start switch 504. This cycle start switch 504 is part of the overall control circuit for operating the motor 40 and friction welding sequence timer (not shown). The friction welding sequence timer is activated when the motor 40 is reversed from a first direction of rotation (during the tensioning process) to a second direction of rotation (during the welding process) and causes the motor to overlap and produce a good friction weld on the webbing section. Operate for the required predetermined time.

If the reset mechanism were to accidentally fail and the welded webbing was removed from the tool and the upper grip pad 206 was released from its upper position, an abutment member such as screw 520 (FIGS. 5 and 7) would attach to the rocker arm 306. , thus limiting the downward movement of the upper gripper pad 206 on the side wall 5 of the housing.
It is set at 30. The rocker arm 306 will ride on the end of the screw 520 and will prevent the upper gripper pad 206 from contacting the lower gripper pad 400. This eliminates the possibility of damaging either or both teeth of the grippapod.

Sequence of Operation Although we believe that the operation of this tool 20 will be readily understood from the above description of the various mechanisms that make up the tool,
For completeness we present here a brief summary of the operating order.

The tool 20 is first placed against the surface of the load P as shown in FIG. 1, and the actuation lever 186 is pushed down to swing the pull arm 130 outwardly away from the pull wheel 126. Wrap the webbing string around the luggage P and pull the ends U and L to the unpillar 146 of the arm 130.
and the tension wheel 126. The actuating lever is then released and the tension arm 130 rotates and the anvil 146
against the overlapping webbing sections U and L and pressing them against the tension wheel 126.

Of course, since the actuating lever 186 is pushed downward when the overlapping webbing is inserted into the tool, the reset link 450 will be moved downward even if for some reason the tool was not previously reset. This opens the locking arm 306 (Figure 5) with the claw 33.
6 and which raises the upper grip pad 206 to a higher position out of engagement with the webbing.

When button 500 (Fig. 2) is pressed, this tool 20
control system is activated, and motor 40 begins to rotate in a first direction (clockwise as viewed in FIG. 2), rotating shaft 70 and pin 92 clockwise via shaft 60 and clutches 76 and 78. .

A pinion 92 at the end of the second shaft 70 passes a ring gear 106 which turns the shaft 100 and turns a worm gear 108 . Gear 120 engages and is driven by worm gear 108 to rotate shaft 112 and rotate tension wheel 126 clockwise as viewed in FIG. 1 to tighten strap ring S around load P. The upper overlapping webbing portion U is tightened against the lower overlapping webbing portion L and the tension wheel tightens the ring.

When tension is applied to the webbing loop, tension arm 1
The self-biasing action of 30 forces anvil 146 further toward tension wheel 126 as the webbing is compressed between wheel 126 and anvil 146 and as the teeth of anvil 146 bite into lower webbing portion L. . This rotates the tension arm 130 slightly further counterclockwise around the axis 132 and swings the tension sensing switch 150 against the screw 180.
is activated at a predetermined tension level. This reverses the rotation of motor 40. A clutch 88 (FIGS. 9 and 10) prevents the second shaft 70 from reversing in the direction of loosening the strap.

When rotation of the shaft 60 is reversed from the first direction to the second direction, the release ring clutch 354 engages the previously disengaged release ring 350 with the shaft 60;
Shaft 60 rotates release ring 350 in a second direction (counterclockwise as shown by arrow 362 in FIG. 11).

Rotation of the drive shaft 60 and the release ring 350 in the second direction is caused by one of the release ring protrusions (e.g. protrusion 37).
8) rotates the release pawl 336 to release the rocker arm 306. As shown in Figure 7,
The rocker arm 306 then rotates clockwise (arrow 600) with its shaft 312 to force the upper gripper pad 206 downwardly against the upper surface of the overlapping webbing section U.

Due to the rotation of eccentric surface 220 of shaft 60, drive ring 214 swings in a circular trajectory in the direction of arrow 602 shown in FIG. 7, thereby transmitting a swinging motion to upper grip pad 206. link 30
2 and 304 through the upper gripper pad 206
Due to the constraint of the rocker arm 306 that is imparted to the upper gripper pad 266, the upper gripper pad 266 reciprocates primarily in the direction indicated by arrow 226 in FIG.
This direction is transverse to the length of the overlapping webbing sections U and L. The upper overlapping webbing portion U captured by the gripp pad 206 is thus moved laterally with respect to the lower overlapping webbing portion L to effect the friction weld.

During this reciprocating movement, the upper gripper pad 206
has a tendency to tilt upward (at the left end of the pad as viewed in FIG. 7) due to a small upward swing of ring 214 on the eccentricity of shaft 60. This slight tilting movement of the pad is accommodated by the lower gripper pad 400, which tilts with the upper pad 206 on the rigid but resilient support pad 402. In this manner, the upper and lower gripper pads 206 and 400 are always approximately parallel with the overlapping strap portions U and L being generally evenly tightened therebetween during the welding sequence.

When the upper gripper pad 206 is lowered onto the overlapping webbing section U, the bottom surface of the overlapping webbing section U is pressed against the serrations 414 of the saw blade 410. The reciprocating movement of the overlapping webbing portion U relative to the saw blade 410 causes the webbing tail portion T (the first
) is cut from the webbing ring S.

The motor 40 is turned in the second direction to perform friction welding for a predetermined period of time controlled by a welding sequence timer in the control system, after which rotation of the motor is terminated.

Tool 20 then tightens and seals the webbing ring by pressing actuation lever 186 and rotating tension arm 130 so that actuation lever cam 188 contacts roller 160 and moves anvil 146 away from tension wheel 126. removed from This allows the tool to be laterally removed from the overlapping webbing parts U and L.

The downward movement of lever 186 and thus actuating lever 188 also causes the upper end of guide groove 454 to engage upper end 455 of reset link 450 (FIG. 3) and causes reset link 450 to move downwardly as shown by arrow 466 in FIG. move to. This is Rotsuker Arm 30
6 from the unlatched position shown in Figure 7.
The latch shown is rotated to the latched position where the release pawl 336, driven by the torsion spring 344, engages the rocker arm leg 340 and the plunger 380 of the release pawl 336 moves into the groove 372 of the release ring 350. Or enter one of 374. If entry into the groove 372 or 374 is prevented by one of the protrusions 376 or 378, the plunger 380
82 and is pushed upwardly against compression spring 386.

Tool 20 is now reset and when the downward force on actuation lever 186 is removed, the entire actuation lever assembly 184 is biased upwardly by torsion spring 184 to the position shown in FIG. In this position, the top 455 of the reset link 450 is near the bottom of the guide groove 454 and the tension arm 130 is biased by the torsion spring 166 so that the anvil 146 is pressed against the tension wheel 126. Moving the actuating lever 186 downwardly moves the anvil 146 away from the pull wheel 126, allowing the overlapping strap sections U and L to be re-entered into the tool to begin the next tightening sequence.

Alternative Embodiment of the Saw Blade A second embodiment of the saw blade for use in tool 20 will now be described with reference to FIGS. 12-15. Tool 2
All components of 0 are the same as shown in FIGS. 1-11 except for the saw blade structure and support elements, which will be described in detail below. Therefore, all elements except those related to the saw blade and the support elements are shown in FIG.
Elements of tool 20 shown in Figures 1 through 1 are illustrated in Figures 12-15 as being the same, and these elements retain the same reference numerals.

An alternative saw blade is designated generally by the reference numeral 410a in FIGS. 12-15. As best shown in FIG. 14, this saw blade 410a is mounted on a pin 412 similar to the first embodiment of saw blade 410 described in detail above. Saw blade 410a can slide forward or backward parallel to axis 60 with respect to upper and lower gripper pads 206 and 400, respectively, along pin 412. This saw blade 4
10a is also adapted to rotate around pin 412 between a lowered strap contacting position shown in FIG. 15 and a raised strap insertion and tightening position shown in FIG.

The saw blades 410a are adapted to contact the upper surface of the overlapping webbing portion U and to sever the upper webbing portion U in a manner described in more detail below. has.

As best shown in FIGS. 12, 14 and 15, a helical compression spring 700 is disposed within a cylindrical bore 710 in a downwardly depending portion 720 of the tool side cover. A portion of this spring 700 protrudes from the hole 710, and the end of the protruding spring portion is connected to the saw blade 41.
Touches the upper horizontal surface of 0a but is not connected to it.

As best shown in FIG. 15, saw blade 410a
is biased downward, so that the teeth 414a are in contact with the upper surface of the overlapping strap portion U. Movement of the upper webbing portion U in the direction of the double-headed arrow 226 parallel to the length of the saw blade during the friction welding sequence (by the swinging upper gripper pad 206) causes the upper webbing portion U to be severed.

As best shown in FIGS. 12 and 13, the forward portion of the saw blade 410a includes a pin 730. The pin 730 is inserted into the cylindrical hole 740 of the saw blade 410a.
Preferably, the pin is a spirole pin received within the pin. The spiroll pin 730 is adapted to project forwardly over the upper gripper pod 206 and engage the upper surface of the upper gripper pod 206 when the upper gripper pod 206 is raised away from the overlapping webbing sections U and L. . Raising the upper gripper pad 206 thus raises the saw blade 410a away from the overlapping webbing sections U and L, and then lifting the saw blade 410a until the upper gripper pad 206 is lowered again into contact with the upper webbing section U. Hold in the upright position.

The spiroll pin 730 of the saw blade 410a is not coupled to the upper gripper pad 206. Therefore, when the upper gripper pad 206 is lowered into contact with the upper strap U, the saw blade 410a is not pulled downward by the upper gripper pad 206. Rather, the saw blade 410a is moved under the influence of gravity and by the compression spring 700.
A small downward force applied to 10a forces it to fall onto the upper webbing portion U. This brings the saw blade into contact with the upper strap part U, and the upper gripper pad 206 with the upper strap part completely lowered.
When reciprocated against the overlapping and lowering blade by the blade, it cuts it quickly.

For example, the saw blade 410a may be
The upper downward biasing force is relatively constant and of sufficient magnitude so that after the upper webbing section U has broken, the saw blade provides a beneficial sawing action on the lower webbing section L without detrimentally impinging on the lower webbing section L. It can be done. It should be remembered that the lower webbing portion L remains substantially stationary during the friction welding process. Furthermore, since the saw blade 410a does not swing, it is impossible for the upper strap part U to be cut off by the saw blade and then the lower strap part L to be cut by the saw blade 410a.

The vertical position of the spiroll pin 730 with respect to the sawtooth 414a is similar to that of the upper gripper pin 206.
The saw blade teeth 41 before contacting the upper surface of the upper strap part U.
4a is preferably selected so as to contact the upper surface of the upper strap part U. Therefore, when the upper gripper pad 206 finally contacts the upper webbing portion U and reciprocates, the saw blade is already engaged with the upper webbing portion.

In the preferred design, it has been found that the upper strap U is severed by the time it has been reciprocated for about 75% of the total friction welding period. That is, after the upper webbing section U is cut, the upper gripper pad 206 continues to rock for an additional period of time to move the cut end of the upper webbing section U relative to the lower webbing section L to complete the weld. The additional welding completion time corresponds to 25% of the total friction welding time in which the upper and lower webbing sections U and L are respectively oscillated in contact.

It has been found that the saw blade design described above provides many advantages. One advantage is the savings in operator labor when used with many plastic webbing. In particular, when the tail of the upper webbing section U is cut, it tends to remain stuck to the saw blade and/or loop of the upper webbing section along with pieces of melted thermoplastic material from the nearby friction solution. have The tail of the severed upper webbing U thus remains at the tool 20 rather than falling out of the tool or being pulled out by the fresless coil of the webbing behind the tool. The operator can then grasp the tail of this "stuck" cut webbing after the weld is complete and, with very little force, pull it out of the tool and away from the welded joint. Can be done. The operator can then wrap the tail of the webbing now in the handle around another load and place it back into the tool 20. If the severed tail of the webbing is not stuck to the tool along with the melted plastic, the severed webbing will fall outside the tool and the worker will have to bend down in preparation to strap another load. I'll have to pick up the webbing.

[Effects of the Invention] According to the present invention, the switching from the tightening process to the fusion welding process of the webbing can be performed automatically and by using the webbing tension sensing control device and the rotation of the electric motor in both directions. With only a simple mechanism,
achieved. In this way, a tool that can be easily operated by an operator and is relatively lightweight and small can be realized.

[Brief explanation of drawings]

BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings which form a part of this specification, the same numerals are used throughout to refer to the same parts. FIG. 1 is a side view of the tool of the present invention, illustrating the tool in a tensioned position on a load, with portions of the structure cut away for convenience of illustration. FIG. 2 is a partial front view of the apparatus shown in FIG. 1, cut away specifically to show internal details. FIG. 3 is an enlarged partial cross-sectional view generally taken along plane 3--3 of FIG. 2, showing the tool in the strap loading position. Fourth
The figure is a view similar to FIG. 3, but showing the tool in the taut sealing position. FIG. 5 is a partial cross-sectional view generally taken along plane 5--5 of FIG. Figure 6 is the 5th
Figure 3 is a partial cross-sectional view of the saw blade area of the illustrated tool, showing the overlying webbing portion being pressed against the saw blade; FIG. 7 is a partial cross-sectional view generally taken along plane 7--7 of FIG. Figure 8 is generally surface 8 of Figure 4.
-8 is a partial cross-sectional view. FIG. 9 is a partial cross-sectional view generally taken along plane 9--9 of FIG. 10th
The figure is a view similar to FIG. 9, but showing the strap retainer being moved in the opposite direction to that of FIG. FIG. 11 is a partial cross-sectional view of the release ring and pawl mechanism shown in FIG.
It shows rotation in the opposite direction to that shown in the figure. FIG. 12 is a partial cross-sectional view similar to FIG. 3, but showing the tool with a second embodiment of the saw blade, with the hold-down member and the saw blade in the raised strap receiving position. 1st
FIG. 3 is a partial cross-sectional view similar to FIG. 8, but showing the tool of FIG. 12 with a second embodiment of the saw blade. FIG. 14 is a view similar to FIG. 5, but showing the tool of FIG. 12 with a second embodiment of the saw blade in the up position. Figure 15 is similar to Figure 7, but
the first with the second embodiment of the saw blade in the lowered position;
The tool shown in Figure 2 is shown. L...Lower overlapping webbing, P...Luggage, U...
Upper overlapping strap part, 40... Motor, 60... First shaft, 64... Receiving hole, 70... Second shaft, 76...
One-way clutch, 92... Drive pinion gear, 1
00...Shaft, 106...Ring gear, 108...
Worm gear, 112... shaft, 120... gear,
126...Tension wheel, 130...Tension arm, 14
6...Anvil, 150...Switch, 154...
... Spring plate, 166 ... Torsion spring, 180 ... Set screw, 206 ... Upper gripper pad, 212 ...
... Frame, 214 ... Ring, 216 ... Needle bearing, 220 ... Cylindrical drive surface, 30
2...First link, 306...Rotzker arm,
309...first end, 311...second end, 31
8... Spring, 320... Torsion spring, 336...
Release pawl, 342...Notch, 344...Release pawl spring, 350...Release ring, 354...Release ring clutch, 372...Outer groove, 374...
...outer groove, 376... wall, 378... wall,
380...plunger, 382...hole, 386...
...Compression spring, 388...Cam surface, 410...Saw blade, 414...Sawtooth, 450...Reset link.

Claims (1)

[Claims] 1. A tool 20 for tightening and closing a loop of a thermoplastic strap S surrounding an article P and having two overlapping parts (U and L), the tool 20
However, devices 100, 102, 104, 108, 112, 11 tighten the ring to a predetermined tension state.
4, 120, and 126, and the tool 20 includes a pressing member 2 for pressing the overlapping portions (U and L) after the loop of the webbing string is tightened to a predetermined tension state.
06 and a pad 400, the pressing member 206
and pad 400 move at least one of the overlapping parts (U and L) relative to the other, thereby effecting friction welding of the overlapping parts (U and L), and the tool 20 is a device for performing the tightening. and a motor device 40 for operating the pressing device.
In the tool, the motor device 40 is a reversible rotator that first rotates in a first direction to apply a tensile force to the webbing and then rotates in a second direction opposite to the first direction to perform friction welding. and the tool further includes a drive shaft device 60 connected to the reversible rotary motor device 40 and thereby sequentially driven into the first and second rotations;
When the drive shaft device is rotated in the first direction, the tightening device 70, 100, 10
2,104,108,112,114,120,
126 thereby tightening the strap ring and disengaging the tightening device from the drive shaft device when the drive shaft device is rotated in the second direction, thereby tightening the strap ring. First clutch device 7 for stopping rotation
a drive shaft device 60 comprising: 6, 78; and sensing a predetermined tension level in the webbing loop being tightened and reversing rotation of the motor device 40 in accordance with the sensing;
a sensing control device 130, 146, for changing the rotation of from the first direction of rotation to the second direction of rotation;
150, 166, 180, and member actuating devices 212, 214, 220 that press and weld the overlapping band portions via the pressing member 206,
302, 304, 306, 308, 310, 31
8,320,336,350, wherein the member actuator is configured to press fusion weld the member actuator to the overlapping webbing portion when the drive shaft device 60 is rotated in the first direction of rotation. a second clutch device 354 for effecting a pressure welding operation of the member actuator when the drive shaft device is released and the drive shaft device is rotated in the second direction of rotation; A tool characterized by having. 2. In the tool described in claim 1,
The drive shaft member 60 has a first shaft 60 connected to and driven by the motor device 40, and includes tightening devices 100, 102, 10.
4,108,112,114,120,126 have at least a second shaft 70, and the drive shaft member 60 further drivably couples the first shaft 60 to the second shaft 70 to drive the webbing loop. a clutch device 76, 78 for rotating the second shaft 70 in a first direction so as to tighten the clutch; The above-described tool separates the two shafts 70. 3. In the tool described in claim 1,
member actuating device 212, 214, 220, 302,
304, 306, 308, 310, 318, 32
0,336,350 is the pressing member 206 when the pressing member 206 is pressed against one of the overlapping parts of the loops of the webbing in a direction crossing the other overlapping part to perform friction welding. The tool 20 further includes saw teeth 414 projecting downward.
and a saw blade 410a rotatably mounted.
and the saw blade 410a is rotated between a lower position in contact with an upper surface of one of the ring overlaps and an upper position spaced from the upper surface of one of the ring overlaps. The saw blade 410a
The member actuating devices 212, 214, 220, 3
02,304,306,308,310,31
8, 320, 336, 350 and for moving from the lower position to the upper position;
14,220,302,304,306,30
8,310,318,320,336,350 of the ring overlap when moving one of the ring overlaps relative to the other of the ring overlaps thereby effecting fusion of the ring overlaps. The saw blade 410a has a member 700 that biases the saw blade 410a to one side with respect to the upper surface of the article P, so that the saw blade 410a cuts the overlapping portion before the webbing is fused to each other, and tension is applied to surround the article P. The above tool separates the tail from the loop of the webbing. 4. In the tool described in claim 1,
The tool 20 includes frames 28, 30, 32, 34,
36, and the drive shaft member 60 is connected to the frames 28, 30, 3
2, 34, 36, the first shaft 60 having a longitudinal axis coaxial with the longitudinal axis of rotation of the first shaft. The motor device 40 is an electrically operated reversible motor 40, and the reversible motor is connected to the frames 28, 3.
0, 32, 34, 36 and the first shaft 60
Apparatus 100, 102, 10 for tightening by rotating in a first direction and subsequently rotating in a second direction opposite to the first direction.
4,108,112,114,120,126
has a tension wheel 126 mounted to the frame 28, 30, 32, 34, 36 that initially engages the webbing portion and moves the webbing portion to place tension on the loops of the webbing. , and a second shaft 70 is provided as part of the tightening device and has one shaft in the receiving hole 64 of the first shaft.
two ends are received and further the frame 28,3
0, 34, 36 for rotation about its longitudinal axis, and a transmission pinion gear 92 driveably connects the second shaft 70 to the pulling wheel 126, so that it is part of the tightening device. at one end of the second shaft 70, the drive shaft member 60 further having at least one one-way clutch 76, 78 in the first bearing hole 64 for engaging the first and second shafts. and rotating the first and second axes in a first direction to apply tension to the loops of the webbing, and rotating the first and second axes in the opposite direction to the first direction without rotating the second axle in the second direction. 2, the sensing and control device 130, 146, 150, 1
66, 180 is a tension sensing device 130, 166 for sensing a predetermined level of tension in the loop of the webbing.
and when a predetermined tension value of the loop of the webbing is sensed by the tension sensing device 130, 166, the first rotation is started.
the tension sensing device 130,1 for reversing the rotation of the motor device 40 from the direction of rotation to a second direction of rotation.
66 and a control device 150, 180 responsive to said member actuating device 212, 214, 220, 3.
02,304,306,308,310,31
8,320,336,350 actuates the webbing pressing member 206 in the second direction to press the overlapping webbing portions after the webbing loop is tensioned to the predetermined tension value. Pressing devices 302, 304, 308, 31 responsive to rotation of the first axis
0,318,320,336,350, by swinging the webbing pressing member 206 to move one of the overlapping webbing sections across the longitudinal portion of the webbing relative to the other webbing section; As a result, in order to perform friction welding of the overlapping webbing portions, the first
Swing drive device 212, 21 attached to shaft 60
4,220. 5. Tool 20 according to claim 4, which includes member actuating devices 212, 214, 220, 30
2,304,306,308,310,318,
320, 336, and 350 further include a locker arm 306 rotatably mounted to the frame and having first and second ends (309 and 311), and a locker arm 306 rotatably connected at one end to the locker arm second end 311 and pressed link members 302, 304 rotatably connected at opposite ends to member 206; and a locker arm spring for moving the locker arm and rotating it relative to the frame, thereby pressing the pusher member 206 against one of the overlapping webbing sections. members 318, 320, and a latch member 34 rotatably mounted to the frame and engaging the locker arm first end 309.
2; and a release pawl 336 with a first end of the locker arm;
a release ring 350 mounted about the first shaft and engaged with the release pawl; a second clutch member 354 drivingly couples the first shaft 60 to the release ring 350 for rotating the ring and thereby moving the release pawl latch member out of engagement with the first end of the locker arm; and the second clutch member 354 disengages the release ring from the first shaft when the first shaft is rotated in a first direction, thereby disengaging the release ring from the first shaft when the first shaft is rotated in a second direction. a second clutch member is engaged and the release ring is rotated in a second direction to rotate the release pawl away from the locker arm first end and to disengage the locker arm first end from the release pawl latch member; As a result, the locker arm is moved by the locker arm spring member to press the pressing member 206 against one of the overlapping webbing sections. 6. A tool according to claim 5, which
The opening ring 350 defines a circumferential groove 372, 374 and at least one wall portion 376, 378 at one end of the groove for engaging the opening pawl 336. 7. Tool 20 according to claim 6, wherein the opening pawl 336 defines a hole 382 and a plunger 38 slidably mounted within the hole 382.
0, and the opening pawl 336 is further disposed within the hole 382 and grooves 372, 374 in the opening ring 350.
a compression spring 386 for moving the plunger therein, and the opening pawl 336
09 has a camming surface 388 that engages the locker arm first end 309 when the locker arm 309 is disengaged from the latch member 342, thereby retaining the opening pawl on the plunger away from the opening ring wall portions 376, 378. The tool 20 further includes a rocker arm spring 318,
320 in one direction to engage the locker arm first end 309 with the latch member 342.
has a reset link member 450 secured to the opening ring such that when the opening ring is rotated in a second direction, the opening ring wall portion forces the plunger to force the opening pawl away from the opening ring, thereby causing the opening ring to rotate in the second direction. The release pawl is rotated to disengage the latch member and the first end of the locker arm, thereby causing the locker arm to be driven by the locker arm spring to move the link member and move the pusher member into one of the overlapping portions of the webbing. the compression spring moves the plunger when the reset link member is actuated to engage the locker arm with the release pawl and moves the plunger into the hole when the release ring contacts the plunger; . 8. Tension sensing device 1 for sensing tension of a predetermined value, which is a tool according to claim 4.
30,166 is frame 28,30,32,3
4, 36 and is rotatably attached to the pulling wheel 12.
a tensioning arm 130 having a tensioning foot 146 adjacent to the tensioning foot 146 and biasing the tensioning arm 130 to rotate relative to the frame 28 , 30 , 32 , 34 , 36 thereby causing the tensioning foot 146 to be attached to the tensioning wheel 126 .
The overlapping portions of the loops of the webbing are biased toward the pulling wheel 126 and the pulling foot 146.
and a tension arm spring member 166 that presses between the tension arm 130 and the control device 150 , 180 .
an abutment member 180 adjacent to the tensioning arm 180; a switch member 150 responsive to movement of the tensioning arm 130 relative to the tensioning arm 130 for energizing the control device and disposed on the tensioning arm 130; and cantilevered on the switch member 150, the spring plate 1 absorbs impact energy in the event that the loop of the strap is accidentally torn and the tension arm 130 suddenly moves toward the abutment member 180.
50. 9. A tool according to claim 4, comprising:
The oscillating drives 212, 214, 220 have a generally cylindrical outer drive surface 220 disposed about a longitudinal axis spaced from and parallel to a first longitudinal axis; The swing drive device 212, 214, 220 further includes an eccentric portion provided on the shaft, and the swing drive device 212, 214, 220 further includes an eccentric portion provided on the shaft while the first shaft rotates in either the first or second direction of rotation. a drive ring 214 mounted to the eccentric portion for rotation about a longitudinal axis of the first shaft, the drive ring 214 being disposed on a generally cylindrical drive outer surface 220 of the eccentric portion of the shaft; The pushing member 206 has a generally cylindrical drive inner surface 216 to cause rotation of the eccentric relative to and within the ring 214, and the pushing member 206 is connected to the drive ring 214 via a member 212 to cause the band to rotate. The tool contacts one of the overlapping portions of the loops of the string, so that the 160th rotation causes the pressing member 206 to swing.