DE2133714B2 - STRAPPING UNIT FOR STRAPPING EXPANSIVE GOODS - Google Patents

Description

The invention relates to a strapping unit for Strapping of expansive goods using a well-known one Tape transport unit, a clamping device connected to a cutting device and a bending and punching tool, with the device parts in one, stepped incisions and off the band plane curved webs producing tool head are united.

In such devices, which are preferably used on baling presses for synthetic and natural fibers find is extensive automation to save and reduce personnel costs the cycle time required.

It is known to meet these needs on a baler zuv processing of expanding material after the pressing process part of the To open press chamber doors by hand, then tape guide, transport and locking devices in their place are supplied (German Offenlegungsschrift 1926292).

Here, however, long process times for removing the press chamber walls occur, which increase costs impact. In the case of this device, it is expensive to adjust the tape guide devices in this way design so that they are not prone to failure with a high degree of mobility. Then there is the magazine for the closure sleeves, which increases the cost of goods and makes the device more expensive

will.

Furthermore, strapping devices for band material belong to the state of the art, in which the overlapping ends of a strap

are connected to one another by punching notches, which are created by the pretensioning of the tape pull into each other to form a seal (British patent 805 765). Such a tool instructs you the counter tool attached to the package (e.g. a box), which is placed between this and the closed, taut strapping is pinched. The tool is after the connection formation removed so that it is pulled laterally from the strapping parallel to the package surface will. In machines, the package is laterally under such a fixed tool gone away.

In the known devices for strapping bales, the straps are on the

ao bale pulled and closed by applying pods. It often happens that the individual Loops of the strapping placed around the pressed material depending on the circumferential length of the strapping that is pulled on, according to the nature of the press and

the position of the product on the press box assume a different extent and therefore the bale is not the same in shape after the expansion of the strapped material.

To avoid this, it has been proposed to automatically loops of the strapping tape or by hand to the still pressurized, located in the completely closed compression chamber To guide bales and through sleeves or by manually hooking previously introduced punched notches (German Offenlegungsschrift 1586 954) at the ends of the strapping band, which is thus predetermined in its length, so that a more uniform one Bale is achieved.

For reasons already described above, the first device is not particularly favorable. That on The procedure described in the second position requires a high level of personnel expenditure.

The invention is based on the object of an independent, automatically acting unit designed as a unit To create the device as a compact structural unit, which is connected to the Preßkammtrtür can be a fast, fail-safe and time-saving strapping of, for example, bales of material such as e.g. synthetic and natural fibers with a strapping loop of predetermined size and after punching of the locking pattern enables their release. According to the invention, this object is achieved by that the tool head is pivotably mounted about an axis and a cutting knife in it Lower band clamps against an adjustable counter pressure piece in the die holder, whereby the cutting knife is controlled via a knife lever by a cam of an eccentric shaft, which follow one another the maxima of further eccentric curves actuated successively patrices.

To introduce the strap into the strapping unit, it is advantageous that by means of a Hand lever which can be lifted by an energy storage mechanism against the conveyor belt.

To use different tape dimensions in width and thickness of the strapping tape the strapping unit is equipped with adjustable guide elements, which enables a quick

and easy adjustment of the strapping unit the strap used in each case is made possible without parts of the strapping unit being replaced Need to become.

If the use of a strapping unit on a baling press is disturbed, it is useful if a longs for replacement of the entire strapping unit can be done by the operator in a few simple steps that on the one hand over a bearing eye and bearing pin and on the other hand interchangeable via a quick-release fastener the bale chamber is attached.

An exemplary embodiment of the invention is shown schematically in the drawing. It shows

1 shows a strapping unit in section,

Fig. 2 is a section along the line Ii-II of F ig. 1,

Fig. 3 is a section along the line III-III of Fig. I,

F i g. 4 shows a section along the line IV-IV in FIG. 1.

Fig.:. possible forms of die notches, F i g. 6 the swiveled-out strapping unit,

7 shows the strapping unit attached to the baling chamber and

F i g. 8 the bale chamber in the front view.

That for the automatic strapping of the clamped in the pressing chamber, made of expansive material The strapping used in existing bales is delivered in coils and in the number of strapping units 1 placed corresponding dispensers, not shown. These are handy for loading preferably carried out horizontally.

To put a strapping unit 1 into operation, the strapping 2 is fed through the inlet funnel 3 and the guide elements 301 adjustable for different widths of the strapping 2 introduced, the counter roller 4 of the transport device 5 by means of the provided for this purpose Hand lever 6 can be briefly released. The counter-roller designed as a needle bearing is used for this purpose 4 eccentrically mounted on the axis 7 actuated by the hand lever 6. This hand lever 6 is pulled by a tension spring 8 against an adjustable stop 9. This is adjustable from an adjusting screw 10 with lock nut 11 formed stop 9 to thereby the transport device 5 to be adjusted specifically to the thickness of the strapping 2 used. The transport device 5 conveys the strapping 2 through the tool head 12, which is attached as a unit and which is also adjustable to different widths of the strapping 2 by means of the guide elements 121 is and through the channel system surrounding the bale and the deflection curves 13 under the closure-forming Male parts 14 of the tool head 12, this being incorporated into the channel system. Here, the end of the strapping band 2, the lower band 15, is brought closer by a later explained process clamped, and the transport device 5 pulls by changing the direction of rotation of the transport roller 16, the strapping removed from the bale through the channel system 2 from the canal system and brings in on three sides placed on the bale, but not yet closed Loops of the strap 2 to a predetermined extent.

The transport device 5 consists of the already mentioned counter roller 4 and a driven one Transport roller 16. This is advantageously provided with a corded running surface and a feather key 17 frictionally attached to a double-bearing feed shaft 18.

This feed shaft 18 is driven via a chain connection 181 shown in FIG a worm gear motor which is expediently arranged above the feed shaft 18 to save space 19. With an appropriate control can

ίο this advantageous for the retraction of the strapping tape 2 can be used by changing the direction of rotation.

The length of the wrapped strap 2 is through both the forward and the return transport a timer determined, but it can also be determined by a length measuring device provided with measuring rollers will.

As already briefly mentioned, the bypassed strapping 2 is used for the withdrawal and punching process

ao clamped as follows:

The incoming strapping .nd 2 is in the tool head 12 via the cutting knife 20, the back of which is advantageously designed as a sliding surface 21, under the male part 14 retained by the pressure of the springs 22 into the channel system 13 and through it around the ball . When it enters the tool head 12 again, the end of the bypassed strapping 2, the lower band 15, is guided by a funnel-shaped guide 23 under the cutting knife 20, which is expediently also designed as a sliding surface 24 on the underside and also advantageously as a band guide by means of a lateral contact surface 25 , guided under the male molds 14 and under the end of the strapping 2 that is still connected to the dispenser. When this point is reached, the feed is switched off and the main motor 26 is activated. This rotates the eccentric shaft 27 by 15 °, which is advantageously easily detachably connected to the eccentric shaft 27 by a spline coupling 28 for later maintenance. As shown in FIG. 3, the rotation acts on a plunger 30 via a control cam 29 provided specifically for this purpose on the eccentric shaft 27, which actuates the knife lever 31 which is firmly connected to the cutting knife 20. The suitable tiltably mounted cutting blade 20 is pressed by the force storage means 32 down and the underlying base tape 15 against a shaped carbon in a tool carrier located die holder 33 screwed back pressure piece 64. Advantageously is provided the cured surface of the pressure piece 34 with a non-slip toothed surface , wa:> a better hold dss now results between the sliding surface 24 of the cutting knife 20 and the counter pressure piece 34 clamped lower band 15. The pressure piece 34 is designed to be screwable in order to enable an optimal thickness setting corresponding to the strapping band 2 used here as well.

The strapping tape 2 that has run in above the cutting knife 20 can now be carried out as described above by changing the direction of rotation of the worm gear motor 19 by means of the transport roller 16 from the Channel system withdrawn to a loop of predetermined circumference lying loosely around the ball will.

The main motor 26 then completes the full rotation of the eccentric shaft 27. This takes place

of the eccentric curves 35, 36, 37 to the inlet funnel 3 in not shown

U ₈ carved
Tool head

_d Umreilungsrmge, their strapping bands m, t

punching

hanging loosely around the bale, the subsequent

SveSdduBWIduiig The SärdnÄStiSnhalter 39 underneath the eccentric shaft 27 have for better Guide to the eccentric curvature that acts on them on ucu through compression springs 22

ΕΐΓ etaer change in the pressure roller diameter By changing the pressure rollers 40, the stroke of the male parts 14 can be determined, whereby the deformation that forms the closure can be corrected only after the punching £ ^ pSÄ & nde strapping of the material coming from the dispenser is separated. A Atochnoid before punching would allow the overlying ligament to slide off, and dam? T would be the necessary overlap for punching the strapping ends no longer

ensures

⁸ The cutting itself takes place during the last punching of the punched image necessary for the subsequent closure image by an upper knife 41 attached to the last applied male mold holder in connection with the cutting edge 42 of the cutting knife 20. The main motor 26 has then made a full revolution and has reached the starting position.

Since the first of all due to frictional forces between the cut edges of the punched patterns of the strapping tape ends The strapping ring is still closed by the hip hangs in the tool head 12 above the die 38 and the die holder 33, the tool head 12 to release the strapping to the bale, pivoted laterally around the bearing points 43 and 44. For this pivoting according to FIG. 6, the mounting of the eccentric shaft 27 is expediently designed so that it is at the same time the pivot axis 45 for the tool head 12 to be pivoted out. The off and Pivoting is z. B. caused by a double-acting pneumatic cylinder 46, which is via a directional control valve is controlled. When swiveling out, an appropriately designed ejector system is used at the same time 47 stripped the material to be strapped from the die 38. The pivoting takes place against the stop bar 51. Also when swiveling in and out

mmäm end pulled together to form the final seal. Due to the predetermined "same circumference of the loops, the bale has a constant shape as it is required in the course of container packaging. The compression chamber is opened and the building is ejected. The formation of a seal by pulling back the tape is not advantageous. From the FIG. 7 shows the retraction of the movable press plate 52. By means of the deflecting curves 13 attached to it, an automatic adjustment of the channel system to the respective desired bale height is eneicht.

3 "The quick replacement of the entire strapping unit 1 is necessary, for example, when the service life of the punching tool has been exceeded and takes place in that the strapping unit 1 is attached to the compression chamber via a bearing eye 48 and a bearing pin 49 on the one hand and a quick-release fastener 50 on the other is. HUfsweise can sichjedoch aucti ^a channel piece ™ s manual strapping used if no strapping is available as a spare at your disposal.

4 <> The compression chamber can be adjusted depending on the number of incorporated Strapping channels with several independently working strapping units Mistake. However, it is also possible, according to FIG. 8, a guided on sliding shafts 53, on a Individual strapping unit 1 located on slide 54 by a travel drive 55 very. Partly from the strapping channel 56 to move strapping channel. By replacing the bolt head, the Another type of lock can be used, 5 »and the lock can be inserted into the Press level are placed where, as is known, the loading of the closure is lower than on the side surfaces the bale.

With only one main motor 26, the space requirements

for the strapping unit in the press chamber door are kept low by the fact that the male molds U and the cutting knife 20 are driven by the eccentric shaft 27, which is space-saving above the male molds, and that the eccentric shaft simultaneously forms the pivot axis for releasing the reifungsbandes.

Another advantage is that the lower band 15 is clamped by the cutting knife 2Ü, which means the tape draw to achieve a predetermined

6 ₅ large tape loop is made possible.

For this purpose 3 sheets of drawings

Claims (4)

Patent claims: 1. Strapping unit for strapping expansive goods by means of a belt transport unit, a clamping device connected to a cutting device and a bending and Punching tool, the device parts in a tool head producing offset incisions and webs bent from the strip plane are combined, characterized in that the tool head (12) around an axis (45) is pivotally mounted and in it a cutting knife (20) a lower band (15) against a adjustable counter-pressure piece (34) stuck in the die holder (33), the cutting knife An eccentric shaft (27) is controlled via a knife lever (31) by a control cam (29), that by successive maxima of others Eccentric cams (35, 36, 37) successively actuated male parts (14). 2. Strapping unit according to claim 1, characterized in that by means of a hand lever (6) and by an energy store (8) against a transport roller (16) pulled counter-roller (4) can be ventilated. 3. Urnreifungseinheit according to claims 1 and 2, characterized in that it on the one hand via a bearing eye (48) and a bearing pin (49) and on the other hand via a quick release fastener (50) -to be exchangeable attached to the test chamber is. 4. Strapping unit according to claims 1 to 3, characterized in that it is adjustable Has guide elements (301, 121).