Apparatus for banding parcels and the like

MEMORY g-'P «.t, and« * · "ib

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BEF; Ck 465 Sp.

The invention relates to a device for tensioning, closing and cutting plastic tapes for packaging, with a rotating tensioning wheel driven, and at least one friction jaw constantly coupled with the drive, which can be compressed by a compressor element against one of the •

ends of the tape that have to be welded together ^ and: * ^: which is moved together with said element in reciprocation above • • * at the other end of the tape. "• · · · ζ * ·

In known tensioning and closing apparatuses * 'for the manufacture of packagings, it is necessary to connect the

Λ tighten for the jaw_Fpressure separately, in how? • ··.

the desired tension of the tape has been achieved. It is also necessary to initiate the process of cutting with a pledge or •_and · Special switch, as soon as the ends of the cable have been welded together. It may occur in this connection that also the part of the packaging tape surrounding the package is damaged and is subsequently broken, when the packaging tape is subjected to stress during transport.

The invention has proposed to avoid these drawbacks and to create a tensioning, closing and cutting device for plastic belts, which works in a fully automatic manner, and in which the tensioning, closing and cutting process proceeds fully automatically afterwards. from the plastic tape and connected the device.

This problem is solved according to the invention, by virtue of the fact that between the drive and the tension wheel there is a governed coupling and a connection element driven by the transmissible torque with the coupling, and that when the maximum moment is reached of rotation makes the compressor element act on the clamp i

mobile friction.

This improvement has the advantage that, when the desired tension of the belt is achieved, the tension wheel is automatically disconnected from the drive, while at the same time the friction jaw is moved to a

* · · · * * Its effective position, and the ends of the tape are joined

·

each other by pressure and friction heat. At the same tifeinpo *

Z · * * a time switch is provided, which conveniently • • • a • or • disengages the drive after a predetermined time, in which the softening of the ends of the tape is achieved by friction, these being able to establish * an intimate union by fusion. * · * .. ·

The coupling can be a magnetic coupling, · a hydraulic or compressed air coupling, or a mechanical · · · coupling. It is particularly advantageous if the controlled coupling is a spring-loaded coupling, whose clamping spring, which is wrapped around a bearing and / or gear part loaded by the transmitted driving moment, is fixed with one of its ends to the spring element. connection, while at its other end it is detachable by means of a moving part when the compressor element is released.

This embodiment can be easily constructed with simple, commercially available parts and guarantees safe operation.

A planetary gear, whose center wheel is connected to the drive, is expediently disposed between the drive and the tension wheel, and the satellites are connected to the tension wheel while the governed coupling is arranged between the drive wheel and the drive wheel.

Λ »7 5- *. ~ r? Λ * · 'T'i «- l_fell V ⁴* the ring gear and the connection element

With such an embodiment it is possible, not only to achieve the demodilization of a very revolutionized drive motor, necessary for the tension wheel that rotates substantially slower, but also to reach through the ring gear of the planetary gear, a command · * . * precise of the connection element that connects the element • · # compressor for the friction jaw.

f · ·

The embracing spring is conveniently laid * in «around the annular toothed wheel of the planetary gear, and engages with one of its ends in a ring of control so / · · · '· carried in a rotating manner, which with an extension 'pr'imera · **. * rests on a flexible element that determines the -type]

· ;

of transmitting rotation, while with a second extension it operates a mechanism designed to unlock and activate the compressor element.

The compressor element can be a lever, one of cu- | The ends act on a compressor roller supported on the movable friction jaw, and the other end of which is unidol with a clamping spring and is articulated to a bent blade which, in its extended position, holds the compressing lever in place. its ineffective position, and which is loaded by the second extension of the control ring, being able to act on the other free end of the clamping spring, in order to release it when the joint of the lever is bent. With this, the friction clamp is placed in its active position at the same time, and the tension wheel is disconnected from the drive, without the operator having to act unrandomly or a switch.

In order that the friction movable clamp, which girf

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5 1 and at the same time when the drive is connected, during the tensioning on the ends of the belt, it does not influence the compressor element, according to the invention, provided with a projection which, in the ineffective position of the compressor element, is , fits underneath an existing protuberance in the • mobile friction jaw, to keep the jaw from sliding away from the ends of the belt. I • * * I

To cut the end of the tape from * the re * l * * * Serve, a movable cutting element is provided ed * sfentido¡ <

• 1 • · · | crosswise with respect to the plane of the tape in direction I • I to the end of the tape to be cut, and indésplasable in a direction parallel to the plane of the tape, by detraction of the ***. * · z I that is moved one of the two ends of the tape eh .vaivén •_and · I by the mobile friction clamp. By means of this embodiment, it is absolutely impossible to prevent the second end of the belt I, which surrounds the package, from being damaged when the cutting is made, since the cutting blade is stopped relative to the second end of the belt. At the same time, the cutting element securely cuts the end 1 of the belt located above, since said end is moved back and forth relative to the cutting blade, thereby achieving the reciprocal movement of the cutting element. and the end of the tape, accurate for a clean cut. To avoid violence in this regard, the cutting blade is conveniently curved slightly in a manner corresponding to the arc which describes the cut edge of the end of the belt when rotating back and forth during the friction process.

To drive the cutting element to the cutting position, and to safely exclude a deterioration of the inferred end: of the belt, the cutting element is depressed by an element

- 6 flexible against one end of the tape. I

To guarantee the automatic cycle, the rope element can be transferred to its ineffective position with a drive means connected to the compression element, and against the flexible element. In this respect can- | of the drive element for the cutting element I '·' · I being a pivoting lever, one end of which is * unidol * »♦ I articulated with the blade holder, and the other end of which | * · I leans against the compressor lever. * ·. · · I «I

Par-a, on the one hand, make possible the movement of rotation I / I • I of the upper end of the tape with respect to the inTéflor and, J • ··.

on the other hand, prevent the ends of the tape * b * s, "slide · · ** * * I from the side of the device, the stq.tfinta channel • · 1 for the two ends of the tape that have if they are unitary, they are limited, on their longitudinal sides, by bodies of rollers loaded by springs. These rolling bodies are suitably balls, which rest on one of the surfaces that limit the tape channel above and below, and can be pushed back, against the springs, to be introduced into existing bores on the opposite surface of the surface. each case. To guarantee faultless guidance, the rolling bodies are arranged in pairs adjacent to the two longitudinal edges of the ends of the tape, and alternatively on the surfaces bordering the tape channel on the upper side and the lower side.

Other features and advantages of the invention are apparent from the following description and from the drawings, in which a particularly convenient embodiment of the invention is illustrated based on examples, showing:

Fig. 1, a hand-held device for tensioning, closing and cor

Tea ^one ías,^one· - » ^one \

- 710 tar plastic tapes for packing, in a side elevation; fig. 2, the object of fig. 1, in a partial vertical longitudinal section, some parts having been deleted in honor of greater clarity;

fig. 3, a partial vertical cross section of the apparatus according to fig. 1, according to line III-III in • · fig. two; J '• * * fig. 4, a longitudinal vertical palatal section of • · · 4 fig. 1, seen from behind according to line IV-IV of * l & fig «•« ·

3, which shows the drive gear;

-the fig. 5, θΐ object of fig. 4, in a secession * ho '. * * · Horizontal according to the line-VV of fig. 4; * · '.. ·,. ···· fig. 6, a partial section according to the fi ^% - '2, according to line VI-VI:.' · 2 fig. 7, a partial view from above on the apparatus according to fig. 1, in which the tensioning and driving lever, seen in the direction of the arrow VII in FIG. two;

«Fig. 8, a detail of fig. 2, on an enlarged scale, 3 fig. 9, a partial view of fig. 2, in which the end of the guide for the tape is appreciated, also on an enlarged scale.

In the drawings, there has been designated with a hand-held apparatus for tensioning, closing and cutting of plastic packaging tapes, in the front part of which 11 are the groups for tensioning, closing and cutting a packing tape lying around a package, and in the rear part 12 of which are arranged the drive motor 13 and the electrical connection and control elements. All the parts are enclosed in a box 14 which, in the longitudinal direction of the apparatus, is covered by a hand lever 15, with which a support plate 16 can be lifted and separated from a tensioning wheel 17, so that the two ends 18 and 19 of the belt can be introduced from one side, that is, from the front in fig. 1, in the guide channel 20 of the belt comprised «« 4 «between the tension wheel 17 and the support plate 16_w. At the same time, a pawl 2 * with 4 4 duct of the belt, which is arranged on one side and phede · · a * 9 · is adjusted transversally with respect a Girecz * * * longitudinal section of the device, allowing the treatment of packaging tapes of different widths. ··. ·· * / * ·

Inside the hand lever 15, there is disposed a rotating compression bar 22, which acts on the upper end 25 of a compressor element 24, which will be described below in more detail. and with which a movable friction jaw can be pushed back to its starting position, a jaw which will likewise be described later in greater detail.

On the upper side of the housing 14 is a switch 25, with which the automatic control device, which has not been shown here in detail, can be connected to the drive motor 15.

/

The tensioning wheel 17 is fixedly supported on the upper end 18 of the belt, which is pressed by the bearing plate 16 against the tensioning wheel, and dragged backwards in the direction of the arrow 26, by turning the Tension wheel in the direction of the arrow 27- The tension wheel 17 is rotatably supported in the case 14, in the front part 11 of the apparatus (Fig. 5), and is set in motion by the helical gear 29, whose wheel heli10

IS coidal 29 sits on the shaft 3θ of the tension wheel and is driven by an endless screw 31, which extends in the longitudinal direction of the box (Fig. 4), and whose endless screw shaft 32 is fixedly connected at its rear end 33 with a satellites carrier 34- of a planetary gear ^ * · · * · · i * rio 35 · The satellites 36 supported on the satellites carrier 34 * · A * »· engage, on the one hand, with a wheel toothed ring 3 * 7 and, «A * on the other hand, with a central gear 38, that, 'qgienta * * * on the output shaft. 39 of a drive gear • * «40, whose drive shaft 4-1 is joined median ******.

a coupling 42 with the drive motor 13 (fig * ··.

X ♦ ·

5).

· ** · ·

On the drive shaft 41, which is supported by

· ·

the box 14 parallel with respect to the output shaft 39 and in turn supports a pinion 43 which meshes with a toothed wheel supported on the output shaft 39, an eccentric 45 is further supported which, via an articulated connecting rod 46, it drives a movable friction jaw 47, which is located above the guide channel 20 of the tape, on the front side of the apparatus, and is pivotable back and forth along a vertical axis 48. in the direction of arrow 49 (Fig. 5).

As seen in fig. 2, the mobile friction clamp 4? it has a longitudinal shape in the form of H, and with its two front branches 5θ and 51 overlaps a support block 52 in the box 14, in which there is also a vertical axis 48, around which the movable jaw Friction 47 can not only rotate, but can also move up and down, within certain limits, in its longitudinal direction. For it to be po30

<img file="ES265140U_D0001.tif" />

In this case, between the support block 52, on the one hand, 3 the front frogs 50 and 51 of the mobile friction jaw 4-7, on the other hand, have sufficient clearance.

In the rear end face 54 of the core 55 of 1ε on balls, as best seen in the pressure picture, which, at its rear end 59 », is undercut 14. The compressor element 24 also has in sn'jSxtrcmo ♦ A · * lower one heel 61 protruding forward, C ^ if-the one that fits below the upper rear branch 5θ »protruding above the front front surface 54, and keeps the sliding friction clamp 47 in its upper position, ineffective, in which it leaves the guide channel 20 open, of the tape, and does not act on the ends 18 and 19 of the tape.

By its upper end 61, the compressor element is hingedly connected, by means of an articulation bolt 62, to the rear parts 65a of an elbow lever 65, whose front part 65b is supported in the case 14 in a rotational manner on a horizontal axis of tilting 64, and extending forwardly beyond said pivot axis 64. The front end 65 of the bell-shaped lever 65 attacks a tension spring 66, which is clamped in the case 14 and which attempts to drag the end downwards. front 65 of the bell-shaped lever 65 and, thereby, to make the barrel lever "11" rotate about its pivot axis J 64, in the opposite direction to that of the clock hands. By this, the angled lever 63 is deviated insignificantly I upwards in its articulation 67, until it rests there against a stop 68,

The hinge bolt 62 is attacked by a strong • 4 * I tension spring 69, which runs approximately dn sin «· 4« I • * * horizontally in a slot 70 of the box, and which by its I 4 I rear end 71 is secured to housing 14 (Fig * 7.) - the I * I tension spring 69 is pivotable el.elemento I • * · I compressor 24 in the opposite direction of the maneo- I illas. ·· · I watch, which, however, is prevented by the bent pdlánca 63, when it is in position '' qxtendida, shown in FIG. 2, when supporting its articulation 67 1 against the stop 68.

In fig. 2, it is seen that at the front end 69 of the crank lever 63, a lever 71 is hingedly coupled, which is hingedly connected to a tilting lever 72, which can swing about an axle 73 supported on the box. , and that with its rear end received 74, press the end 75 of a clamping spring that, through an elongated opening 76 of a partition 77 of the ca | ja, penetrates the lever linkage area, and whose function will be explained below in more detail.

As can be seen from fig. 2, at the rear end of the front part 11 of the apparatus 10, I above the guide channel 20 of the belt, a knife guide block 78, on which a sleeve 79 is vertically movable. guide-blade, which in its

The lower end carries a knife holder 80, on whose front side a cutting element 81 is fixed by means of screws 82, for example% a blade.

The blade of the cutting element 81 is of a partially cylindrical shape, and is curved according to a *

circle arc, whose center is on axis 48 of the ·

Mobile friction clamp. * '··' «

/ * * *

The guide-guide sleeve 79 has a blind hole 84 open upwards, in which a compressor 85 is disposed which, on the one hand, bears against the bottom ** the blind shaft 84 and, for on the other side, against the upper base 86 r * * * · of the guide-blade block 78, and that it is intended to press down on the sleeve 79 guiding-knife with the holder-cucSiCl * a and the cutting element 81. fixed in this one. The spring CQ! Element 85 embraces a pull bar 87, which is fixed to the lower part of the knife guide sleeve 79, passes through the upper base 86 of the guide-knife block 78, and is hinged with its free end an elbow lever 88, which with the bevelled end 89 of its other free branch 9θ abuts against the trailing edge of the compressor element 24.

It is seen in fig. 2 that the bell lever 88, in its position shown in fig. 2, pulls up the blade holder sleeve 79 and, with it, the blade holder and the cutting element, against the action of the compressor spring 85, and holds the cutting element in its ineffective position.

If figs. 3 and 4, it can be seen that the ring gear 37 is supported with an annular flange 91 in a rotatable manner on the helical shaft 32, a flange which is surrounded at a certain distance by the flange 92 of a

- 13 "control annulus 95, which is likewise rotatably supported on the helical shaft 52. On the annular flange 91 of the annular gear 57 is wound, under tension, a clamping spring 94-, the rear end of which protrudes towards out through the elongated opening 76 *

of partition 77, and rests against the angled end 74 of •

* V the rocker lever 72, as it has been explained and &amp; more *

* * * above. The other rear end 95 of the embracing spring • · · «

94- is fixedly connected to the control ring 93 4-).

It is seen in fig. 5 that the control ring 1 is provided with a first extension 96, which is extruded * · radially outwards, and a safety extension V, '97 ♦ * · * · diametrically opposite, which also extends radially towards outside. The first extension 96 of the "handle" 93 fits into a niche 98 of the box 14, and rests on one of the ends 99 of a flexible element 100 which, in the * exemplified embodiment, is a compressor spring, which with its other end 101 bears against a flexible support 102, which is supported by an adjustment spindle 105, which with its threaded end 104-projects out of the box 14, on which a nut is screwed of regulation 105 for adjusting the tension of the flexible element 100.

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The second extension 97 of the control ring 93 penetrates, through an opening 106 in the partition 77 of the box, into the slot 70 and, below the articulated lever 63, it attacks the part of this located in front of the axis of tilt 64.

To be able to insert the .extend 18 and 19 of the tape easily into the guide channel of the tape, and hold them there :. safely without lateral movement of tilt 'SBfiWlí •^one

SX'í

I.

- 410 of the upper end 18 of the tape relative to the lower end 19 thereof is obstructed, are the base plate 10 provided? of the apparatus, as well as at the bottom of the middle 108 that covers above the channel guide channel 20, on both longitudinal sides of said channel, drills *

M «» 4 blind 109 and 110 respectively, in which are disposed4 "•» · the bodies of race 112, conveniently balls, which are loaded by compressor springs 111. The bodies *. Of ro »* * 112, which protrude outward from their taladi'b's * dots 109 and 110, rest in each case against opposing surfaces 113 and 114-, which limit both above and below the surface. · Guide channel 20 of the tape, that is, that the hard bodies ···· last 112a arranged in the base plate 10? they are pressed by their springs 111 against the underside 113 of the intermediate fleece 108, while the rolling bodies 112b, arranged in the blind holes 110 of the intermediate bottom 108, are pressed by their springs 111 against the upper side 14 of the plate of base 10 ?.

In fig. 2 is appreciated, although still better in fig. 8 and, in the., 9, that the rolling bodies 112 are arranged in each case in pairs adjacent to the ends 3 18 and 19 of the belt, and that the pairs of rolling bodies 112a, arranged on the plate base 10 ?, are located, seen in the longitudinal direction of the belt, at a distance from the rolling bodies 112b, located in the intermediate bottom 108.

The operation of the device according to the invention is as follows:

Once the packing tape has been laid around the package, which has not been shown here in detail,

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<img file="ES265140U_D0002.tif" />

15 and that the ends 18 and 19 of the belt have been introduced in front in the guide channel 20 of the belt, for which the bearing plate 16 has been separated from the tension wheel by means of the hand lever 15, the latter is released, so that the support plate 16 presses the ends 18 and 19 of *

***** the tape against the tension wheel 17- Then, and by means of the switch 25, the drive motor is switched on »» ·&gt;

through the connection command, which has not been represented •&gt;

# * * * tado here in detail. * ·· *. ·

When the drive shaft 41 is rotated, it causes the friction jaws' '* r3t $ vil' · '· of friction 47 to be rotated through the articulated rod 46 in its raised position, shown' aú.'la, *. · »· Fig. 2, the upper rear branch 5θ soap.fe.supporting the projection 61 of the pressure element 24. The movable friction jaw 47 does not drag the upper end of the ends 18 and 19 of the belt, located below it, due to said support, but moves freely over the ends of the tape.

At the same time, the central gear 38, which drives the satellites 36, is driven by the drive gear 40. Since the ring gear 37 of the planetary gear is held by the control ring 95, pofi is motionless as soon as the satellites engage. 36 with the internal toothing of the annular gear 37, thereby rotating the helical shaft 32, which is fixedly connected to the satellite carrier and which, through the helical gear 29, drives the shaft 30 of the tension wheel , so that the tension wheel 17, integrally joined in rotation with said shaft, is rotated and pulls the upper end 18 of the packaging tape in the direction of the arrow 26 through

16 "of the apparatus, thus tensioning the tape around the package, since the lower end 19 of the tape is fastened to the apparatus, in a manner that has not been shown in detail.

As soon as the desired tension of the tape exceeds the »

value set in flexible element 100, the moment of • 9 *

* · »1 rotation transmitted by the annular gear 5 ?, through the coupling 94 by spring-loaded clamp, to the control ring 93, •» · * overcomes the elastic force of the flexible element 100, 'ooare the which supports the first extension 96 of the command ring.

/ drunk to it begins the control ring 93 to rotate ** efi la • · * · fig. 3 θη clockwise, as indicated there by arrow 115 · This "rotation" means that the second extension 97 of the control chord raises the end of the articulated lever 63 front in fig. 2, against the action of the tension spring 66. In this case, the articulation 67 of the articulated lever 63 is bent downwards, so that the pressure element 24 loses its support at the upper end, and the spring can come into action of traction 69 (Fig. 7), which causes the pressure element 24 to tilt forward, in the opposite direction to that of the hands of the watch. Due to this the projection 61 leaves the movable friction clamp 47 free, and, the lower end 59 of the pressure element 24 presses on the compressor roll 58 supported on the rear front surface 54 of the movable friction jaw. This causes the movable friction jaw 47, which is still moving back and forth while the drive is in motion, to be pressed down and to drag the upper end of the belt, for which it is tilted back and forth in

- 1710 *

vertical shaft winch 48, under the lever pressure exerted by the pressure element 24. As a result friction heat is produced in the known manner, heat by which the surfaces i of the ends of the belt soften one on the other, being able to obtain a union by fusion, when later the friction jaw stops * * * under pressure. · * »· *

When, under the action of the spring 69, the pre-displacement element 24 tilts forward, it tilts with it the angled bracket 88 which, as is known, leans against its rear end. The knife guide sleeve 79 and the knife holder 79 are free therewith, and the compression spring 85 presses them down until the head 83 of the teeth 82 rests on the upper side 85. The indentation 84 'existing in the lower rear section of the movable friction jaw 47. As the upper end 18 of the belt tilts back and forth under the cutting element 81 pressed downwards, in a transverse direction with respect to the direction The cross-section of the tape is cut by the cutting element 81, which in turn does not even touch the lower end 19 of the tape at the same time.

When the pressure element 24 swings forward in the counterclockwise direction, a switch 116 is activated, which until now was pressed downwards by the upper end 23 of the pressure element.

I

24, keeping him in his ineffective position. This switch 116 triggers a time mechanism, which allows the drive motor to continue running for a certain time, calculated in such a way that the movable friction jaw 47, (] ur is made to swing back and forth by the drive motor.

<img file="ES265140U_D0003.tif" />

<img file="ES265140U_D0004.tif" />

Under the pressure of the pressure element 24, it can generate the heat necessary for the friction welding process, and so that the ends of the tape, which rub against each other, remain surface-hardened in the desired manner.

TO

At the same time as the lever * is rotated, the lever 63 also swings, moved by the lever 71, * the * pivoting lever 72 in the clockwise direction, • • »» so that its end Layered 74 presses over the ends 75 of coupling 94 by spring clamp. Said coupling 94- is released thereby, so that the annular gearwheel can freely rotate on the circumferential shaft 32. The central gear 38 of the anechoic gear 35 then drives, at through the satellites &amp; 6, to the annular sprocket 37, causing it to rotate, and the satellites carrier and the helical pinion 28 attached thereto, stop.

When the time mechanism has finished operating, it disconnects the drive motor 3 through the control circuit, in a way that has not been shown in detail. As a result, the movable friction jaw 47 is stopped, while maintaining the pressure exerted by the pressure ele- ment on the friction jaw. Thanks to this, the ends of the tape, pressed tightly against one another, can be welded together in the clamped area, and thereby be connected to a tensile test.

By pressing the hand lever 15 downwards, the support plate 16 can be lifted and separated from the tensioning wheel 17, and the apparatus 10 can be pulled out from the bundled packaging tape, on the one hand. In this respect, the rolling bodies 112 are pressed back into their blind cutters 109 and 110, so that the packaging tape can slide forward, leaving the guide channel 20 of the tape.

When the hand lever 15 is depressed downwards, the pressure bar 22, arranged in the tiltable hand lever, attacks the upper end 23 of the elément.

** * of pressure 24, and pushes it, against the action to? the "muelie of traction 69, to its starting position, represented in fig. 2, while at the same time it is made «bAsÍJular«

the toggle lever 88, the cutting device 78 being removed to point 83. In addition it returns the upper end l

to press against the switch 116, take it to its starting position. f7'n

The invention is not limited to the example of realism, but various modifications and complements are possible, without thereby abandoning the framework of the invention. As already mentioned, it is possible to use a magnetic coupling, a ratchet or a coupling by compressed or hydraulic air, in place of the spring-loaded coupling, which has been shown and described, for decoupling the tension wheel from the drive. , and at the same time activate the pressure element. It is also possible to use other tensioning devices, such as, for example, belt tensioning devices, or to use, instead of the clamping lever, a hydraulic pressure element to press down the movable friction jaw.

In summary, the Utility Model, which is requested, should fall on the following claims.