DE2705100C2 - Strapping band tensioning and closing device for a strapping machine - Google Patents

Description

Drive motor, Transmission, the invention relates generically to a Tensioning device, strapping tensioning and closing device with Closing and cutting device as well as io Control device, drive motor,

Transmission,

the gearbox as a differential gear with tensioning device, Sun gear, planet gears and planet gear carrier closing and cutting device as well Output as well as with surrounding ring gear and control device, Ring gear output is formed, on whose sun gear the drive motor works, whereby the gear as a differential gear with sun output drives the clamping device with a wheel, planetary gears and planet gear carrier Ahtrieb so-tensioning wheel and on the other output the supply as with the surrounding ring gear and ring gear output wear and. Cutting device is connected, 20 is formed, on the sun gear of the drive mode a VCismm- and cutting punch as well as a gate works, with the clamping device on one of the drives having the clamping device, the control device with a clamping wheel and a locking disk on the other dressing device traversable drove the locking and cutting device attached locking trough and one is closed on the locking disc, which has a clamping and cutting punch thus resting on a lever arm and in the arm 25 like a counter-holder Retiermulde enclosing, pivotable locking control device has a locking disc with overhanging lever and is designed such that it rer locking recess and one on the locking disc one of the output drives or one of the connected lever arms resting on a lever arm and blocked in the locking module components and having a pivotable locking lever that surrounds it before it is reached given, acting on the other output 30 and is designed such that it is one of the outputs Releases torque and blocks the clamping device or one of the connected components gear ended and the closing and cutting process when reaching a given one in the other gear initiates, characterized in that the torque acting on the output releases and that the tensioning wheel (12) a-i terminates the ring gear output (10) during the tensioning process and the closing and is connected and the pi; .Letenradträger-Ab- 35 initiates the cutting process

drive (8) the closing and cutting device (4) the generic strapping tensioning and driving that the control device (5) is a right attached to the closing device is the subject of an older planet gear carrier output (8) (DE patent 26 41 889). In the execution control and actuation shaft (18) has on the form according to the older law is the tensioning wheel to which the locking disk (15) and cam disks (19, 40 planetary gear carrier output. The hollow 20) for the control and actuation of the Verrad output works on the closing and cutting-closing and cutting device (4) arranged device. The arrangement is also made in such a way that the locking lever (17) with its other - that the control device on the ring gear during the ren lever arm (21) blocks a clamping process against the tensioning wheel (12) and when a working pressure system is reached ( 22) to press the 45 correct, by the tensioning process on the ring gear strapping band (23) on the tensioning wheel (12) as well as the applied torque releases the ring gear and a locking lever (24) for the tensioning wheel (12) sets the tensioning wheel by inserting a lock stops That works and that the closing and cutting device has proven itself. After the tension has been reached, the device (4) exits the cam disks (19, 20) via a locking lever from the locking recess and consequently the toggle system (25) can be actuated x through the further rotary movement of the sun gear

2. Strapping tensioning and closing before the planetary carrier the no longer locked ring gear in direction according to claim 1, characterized. Rotational movement offset This ring gear is overworking that the ring gear (9) has an axis of rotation, a gear on an eccentric shaft, which causes the closure perpendicular to the control and actuation shaft and the cutting process. In the generic (18) of the closing and cutting device (4) 55 embodiment, however, the tensioning of the strapping cannot easily be carried out in several tensioning

3. Strapping tensioning and closing steps are carried out as is the practice, depending on the situation Direction according to one of Claims 1 or 2, according to which the goods to be strapped, for the precise achievement, are characterized by the fact that the pressure system (22) requires a predetermined strap tension

a pressure lever (27) which on the one hand un- eo The object of the invention is to further develop the gatter interconnection of the strapping band (23) proper strapping band tensioning and closing against the tensioning wheel (12) working pressure roller device so that the tensioning of the (28) and which, on the other hand, can be guided against the action of the strapping band in several tensioning slides by an adjustable pressure spring (29) and very precisely when one is reached the locking lever (17) connected push rod 65 predetermined tape tension the closing and (30) is connected. Cutting device is operated.

4. Strapping tensioning and closing before To solve this problem, the invention teaches that Device according to one of Claims 1 to 3, characterized in that the tensioning wheel is connected to the ring gear output

and the planet gear carrier output, the closing and Cutting device drives that the control device is connected to the planetary gear carrier output Has control and operating shaft on which the locking disc as well as cams for controlling and actuating the closing and cutting device are arranged that the locking lever with its other lever arm is working against the tensioning wheel Andrücksysteni for pressing the strapping onto the tensioning wheel as well as a locking lever for the Tensioning wheel operated, and that the closing and cutting device of the cam disks via a toggle system The measure to connect a tensioning wheel to the ring gear output and a planetary gear carrier output can be actuated Working on a closing and cutting device is a non-generic one Strapping tensioning device known per se (DE-AS 10 51 188). To solve the invention This measure alone does not contribute anything to the underlying task.

To achieve a compact design, the ring gear expediently has an axis of rotation, which runs perpendicular to the control and actuating shaft of the closing and cutting device. The pressure system has according to a preferred embodiment of the invention a pressure lever, the one hand under Has interposition of the strapping against the tensioning wheel working pressure rollers, and the on the other hand against the action of an adjustable pressure spring connected to one with the locking lever The push rod is connected. On the other hand, a pull rod is expediently connected to the locking lever, which actuates the locking lever for the tensioning wheel

The advantages achieved are to be seen in the fact that in a strapping band according to the invention and tensioning Closing device the tensioning of the strapping can be done in several tensioning steps can and after reaching a very precisely predeterminable Banc'j tension the actuation of the closing and cutting device only one embodiment of the drawing will be explained in more detail. It shows in schematic depiction

F i g. 1 the view of a strap tensioning and Locking device,

F i g. 2 shows a section in the direction AA through the object according to FIG. 1 with details of the differential gear and with drive motor,

3 shows a section from the control device, namely di ·; Locking disc with the locking lever and Parts of the pressure system,

4 shows a section from the control device, namely the cams with the toggle system and parts of the closing and cutting device.

The strap tensioning and closing device shown in the figures belongs to a strapping machine at. Part of the basic structure

a drive motor 1,

a transmission 2,

a clamping device 3,

a closing and cutting device 4 and

a control device 5.

The transmission is as, differential gear 2 with sun gear 6, planet gears 7 and planet gear carrier output 8 as well as with surrounding ring gear 9 and ring gear output 10 formed on the sun gear 6, the drive motor 1 works via a further transmission 11. On one the output drives 8, 10, the tensioning device 3 is connected to a tensioning wheel 12. To the other output 8 the closing and cutting device 4 is connected. The closing and cutting device 4 has a clamping and cutting punch 13 and a counter holder 14.

ίο The control device 5 includes, among other things, a Locking disc 15 with traversable locking recess 16 and on the locking disc 15 adjacent as well as in the The pivotable locking lever 17 enclosing the locking trough 16. The control device 5 is designed so that it blocks one of the drives 8, 10 or the connected components and when a specified, releases the torque acting on the other output 8 and thereby terminates the clamping process and initiates the sealing and cutting process This happens in a special way:

First, the arrangement is such that the tensioning wheel 12 is connected to the ring gear output Ut and the planetary gear carrier output 8 works on the closing and cutting device 4. The control device 5 has a control and actuating shaft connected to the planetary gear carrier output 8 18, on which the locking disk 15 and cam disks 19, 20 for the control and actuation of the closing and cutting device 4 are arranged. 3 and 4 referenced. From a comparative consideration of FIG. 1 and 3 it can also be seen that the locking lever 17 with its other lever arm 21 actuates a pressure system 22 working against the tensioning wheel 12 for pressing the strapping 23 against the tensioning wheel 12 and a blocking lever 24 for the tensioning wheel 12. The F i g. 4 makes it clear that the cam disks 19, 20 are connected to the closing and cutting device 4 via a toggle lever system 25. The tensioning wheel 12 is placed on the ring gear 9 in the exemplary embodiment. The gear wheel 9 has an axis of rotation which runs perpendicular to the control and actuation shaft 18, the control and actuation shaft 18 being connected to the planetary gear carrier output 8 via a bevel gear 26.

From FIG. 1 it can be seen that the pressure system 22 has a pressure lever 27, which on the one hand with the interposition of the strapping 23 against the tensioning wheel 12 has pressure rollers 28 and on the other hand against the action of an adjustable pressure spring 29 on one with the locking lever 17 connected push rod 30 is connected A comparative consideration of F i g. 1 and 3 leaves recognize that a pull rod 31 is also connected to the locking lever 17, which the locking lever 24 operated as a locking device for the tensioning wheel i2. The mode of operation of the strapping tensioning and closing device described is described below by describing an automatic strapping process explained in more detail. As shown in FIG. 1 can be seen, this is in a bypass 32 The strapping 23 located around the packaged goods 33 is driven. The control and operating shaft 18 is through the locking disk 15 and the locking roller 34 are locked on the locking lever 17 (see FIG. 3). The right flank 35 of the locking trough 16 rests against the locking roller 34. The clamping and cutting punch 13 is located in Middle position, d. H. the strap 23 has on the

Clamping and cutting point free passage. This described state corresponds to the example shown the basic position, which must be reached again after each strapping. Should an automatic strapping are carried out around any large packaged goods 33, the drive motor 1 is switched on in the direction of rotation, so that the tensioning wheel 12 in FIG. 1 is given a clockwise rotation. The gearbox 2 is used to control and actuating shaft 18 with left-hand rotation in FIG. 3 and 4 driven. Always starts with drive 2 to rotate the drive 8,10, which has to do less work. Through the gear ratios in the gearbox 2 and in the cam shape this process can be determined. In the present case work must be performed immediately by the tensioning wheel 12, while the control and actuating shaft 18 can initially rotate freely. So that the control and actuating shaft 18 rotates first. The locking recess 16 on the locking disk 15 only prevents further rotation when it engages against the locking roller 34 Resistance is exerted, which requires a greater torque to rotate the control and actuation shaft 18 than to drive the tensioning wheel 12. During this rotary movement of the control and actuating shaft 18 the clamping lever 36, which is mounted in a bracket, is pivoted by the cam 29 so that the Toggle lever system 25 comes into the extended position and the clamping and cutting punch 13 the driven Packing tape tip presses against the counter holder 14 and clamps with its teeth The increase in the Cam 19 is chosen so that with low torque on the control and actuating shaft 18 clamping is achieved. Before the full clamping force is reached, the drive torque should be applied to the Control and actuation shaft 18 are larger than that for transporting the strap 23, so rotates

iG5 Umj one

is pulled to the packaged goods 33. If the strapping 23 comes to rest on the packaged goods 33, it increases the drive torque on the tensioning wheel 12. If the drive torque is greater here or earlier at a point in time than that on the control and actuation shaft 18, the control and actuation shaft 18 rotates again. the The clamping force increases with increasing belt tension by itself up to the maximum clamping force at pushed through toggle lever system 25 is reached and at the same time the left flank 37 of the locking recess 16 on the locking roller 34 comes to rest. The locking recess 16 is provided with a curvature in its base, the already during the clamping process a certain increasing pressure over the pressure system 22 on the Strapping 23 and tensioning wheel 12 transfers, whereby the required grip connection is present since another spring 38 acting on the pressure lever 27 is only designed for a lower pressure force is to keep the wear as low as possible. The further rotation of the control and actuating shaft 18 is initially prevented by the locking disk 15 so the strapping 23 can be tensioned with the tensioning wheel 12 up to a value that is the one set The force on the push rod 30 corresponds to the required pressure force increasing constantly with the clamping force The required ratio of these two forces is determined by the slope of the flanks 35,37 determined on the locking recess 16 and the Hebei translation Since the tensioning process of the strapping 23 around the packaged goods 33 is usually as slow as possible and must be done very powerfully, between the drive motor 1 and drive shaft 39 of the transmission 2 a automatic overload clutch can be arranged with the required gear ratios, what is not the subject of the invention. When the desired clamping force is reached, the locking roller 34 is switched off the locking recess 16 of the locking disc 15 is pressed.

The push rod 30 is against the force of the pressure spring pretensioned by the adjusting nut 29 29 (Figs. 1 and 3) pushed upwards. At the same time will

ίο the tensioning wheel 12 via locking lever 17 and pull rod 31 blocked with the blocking lever 24. Only the control and actuation shaft 18 rotate on which all the necessary cams 19, 20 for the individual operations of any Packing tape closure, such. B. punch, lead seal or weld closure can be arranged. Next to the clamping of the tape tip, regardless of the type of closure, the returning strap must always be used 23 are cut off. The cutting is carried out during or after the closure is carried out the clamping and cutting punch 13 achieved by using the cam 20 of the cutting lever 41 in F i g. 4 is pressed to the right and the strapping 23 is cut against a stationary knife 42 will. Then the clamping and cutting punch is set by pressing the cam 19 on the clamping lever 36 13 brought into the middle position, in which the strapping 22 at the clamping and cutting point free passage Has. By pulling back the counter holder 14, also by means of a corresponding cam disk Lever system, the finished strapping is released and the locking roller 34 jumps back into the locking trough 16 of the locking disc 15. This enables a pulse generator to be activated at the same time, which gives the completion message the strapping there and the drive motor 1 for the purpose of re-driving the strapping 23 is redirected to bypass 32 So that, as at the beginning of the entire process, the control and actuating shaft 18 rotated to the right, as by the caster of the drive system in the previous one Switching over the control and actuating shaft 18 in the context of the locking recess 16 rotated a little further when she was standing at the time of the impulse. By turning the control and actuating shaft 18 right, until the right flank 35 of the locking recess 16 rests on the locking roller 34, that is achieved also the clamping and cutting punch 13 is in the middle position and the strapping 23 freely through the Lock area can run. The driving process is switched off by pulling in the Tape tip under the incoming strapping 23 between feeler roller 43 and counter holder 14. This is actuated the lever 44 the limit switch 45. The gap between the feeler roller 43 and the counter holder 14 is with the adjusting screw 46 can be adjusted against a compression spring 47.

For this purpose 2 sheets of drawings

Claims (1)

1 2 characterized in that the locking lever (17) has one patent claim: a pull rod (31) is connected which actuates the locking lever (24) for the tensioning wheel (12) 1. The strapping band tightening and closing direction for a strapping machine with 5