DE102014103236B4 - Sack feeder with adaptive knife block - Google Patents

Abstract

Bag feed device, in particular for a stationary industrial sewing machine, welding device or the like for making bag closures, consisting of - a substantially horizontally arranged support plate (20), - in the longitudinal direction of the support plate (20) extending through slot (21), - one on both sides conveying means (6) arranged in the through slot (21) for gripping the bags (27) below the upper sack edges (28) to be sutured and for feeding the sacks (27) to a sewing unit, welder or the like, one near the entrance area (22) of the passage slot (21) arranged on the support plate (20), with a drive motor (3) connected gear box (1) whose output shafts (4) with the conveyor (6) are in operative connection and set in motion, and two opposed, drivable, about substantially vertical axes rotating cutting blades (11, 14), characterized in that - the rotating cutting blades (11, 14) are mounted in a separately formed knife block (2) and - that the knife block (2) relative to the gear box (1) in the vertical direction between a lower active and an upper inactive working position slidably disposed and fixable in these working positions.

Description

The invention relates to a sack feeding device, in particular for a stationary industrial sewing machine, welding device or the like for making sack closures, consisting of a substantially horizontally arranged support plate, extending in the longitudinal direction of the support plate through slot, arranged on both sides of the passage slot conveyor for gripping the bags below the suture edges to be sutured and for feeding the sacks to a sewing unit, welder or the like, a gear box connected to a drive motor near the entry area of the through slot, the output shafts of which are in operative connection with the conveyor and in motion offset, and two opposed, drivable, rotating about substantially vertical axes cutting blades.

There are sack feeders for bag closures are known which have stationary arranged cutting blade. These are integrated into the transmission unit and are directly driven by the transmission, which also serves to actuate the conveyor. Thus, the known device can only be used to pick up the sewing material in the sack feed, to cut it in the subsequent unit and then to sew it on in the subsequent sewing unit.

When using stationary sewing machines for bag closures, it is also often the case that the upper edges of the bag need not be trimmed or should not be trimmed. In such cases, then another stationary sack feed must be used, which has no built-cutting blades.

From the US 37 20 559 A a similar device is known which serves for welding plastic bags.

In this complex and stationary device arranged the upstream cutting blades are firmly integrated into the device. The cutting blade pair and its holder are firmly screwed to the support plates as well as the other functional elements, wherein the support frame, in which the cutting blades are mounted, a static functional part, by which the mounting plates are held together. If the support frame is unscrewed from the mounting plates and removed together with the cutting blades of the entire device, the device is no longer functional, since it would lack the necessary stability. It is in this known device is a stationary device in which the cutting blades are a firmly integrated part of the overall device. In this known device therefore also has the disadvantage that it is not flexible and can only be used for the intended use, ie including trimming the upper sack edges.

The invention is therefore an object of the invention to make a sack feeding device so that it is suitable for the application of both methods and that it can be adjusted to both methods without major set-up, d. h., that she can easily work with cutting knives and once without a cutting knife.

According to the invention, this object is achieved in that the rotating cutting blades are mounted in a separately formed knife block and that the knife block relative to the gearbox in the vertical direction between a lower active and an upper inactive working position slidably disposed and fixable in these working positions.

Thus, according to the invention, the user has the option of cutting the sewing material prior to entering the sewing unit or the welding device, or to completely dispense with cutting the sewing or welding material. Such a device is particularly suitable for those cases where the user wants to set up only a single machine for different operations.

Another significant advantage of the invention is that the conversion of the system can be done only by simple height adjustment of the knife block. The conversion can be done without the use of tools, because the separately trained knife block can be solved by simply pivoting a clamping lever, then moved and secured by re-actuation of the clamping lever in its height position. The set-up times are negligible, and the conversion can be carried out easily by untrained people. There are thus no partial assembly or disassembly or remodeling of parts required, and there are no parts, such as the cutting blade, to be stored. The knife block is always on site and is always ready to use.

The fact that the knife block is moved only in height, there is the additional advantage that the system can be installed very space-saving, since no pivoting or displacements of the knife block to the side are required.

At the same time there is by an exact height adjustment the advantage that the escape of the Shafts is firmly defined and no loss of blade position occurs in its cutting height, so no re-adjustment of the knife and the blade force is required. The original settings are not lost.

In a preferred embodiment of the invention, the knife block is equipped with a profile carrier, which has at least one vertical guide groove, wherein an engaging in the guide groove fastener is provided which is in the guide groove by pressing a clamping lever is tightened and fixed the knife block relative to the gear box.

To drive the knives, a separate drive may be provided which is directly connected to the knives. Preferably, however, the knife drive is effected by the already existing conveyor. This can be done by providing a rotatable force transmission element in the region of at least one of the two blade axes, which can be driven by means of the conveying device and can be coupled with the corresponding blade axis in the lower active working position.

In this case, the lower end face of at least one of the knife axes may be provided with an upper part of a positive plug connection, while the rotatable power transmission element is designed as a complementary lower part of the positive plug connection, wherein the upper and lower parts of the plug connections in the lower operating position of the knife block coupled together are.

In this construction, only one of the two blade axes needs to be driven by means of the force transmission element, while the second blade axis can be connected via a gear transmission with the first blade axis.

Appropriately, arranged in the region of the passage slot of the support plate, serving as a bag feed conveyor two endless drive elements, which are driven by means of an output shaft of the gearbox.

The endless drive elements can be designed as link chains whose mutually facing runs serve to transport the material to be sewn. As an alternative to the link chains and belt or belt-like driving elements can be used, which are driven by means of toothed belt wheels.

The endless link chains are preferably driven by seated on the output shafts of the gear box tooth or sprockets.

The rotational movement of the lower part of the positive plug connection is preferably derived by means of a transmission element of the endless drive element.

As a transmission element may be provided a toothed or sprocket, which is in communication with the corresponding link chain and converts the linear movement of the link chain in a rotational movement of the lower part of the connector.

The invention is illustrated by way of example in the drawing and described in detail below with reference to the drawing. Show it:

1 FIG. 2 is a perspective front view of the sack feeding device according to the invention, the knife block assuming its decoupled or inactive working position and with the following processing units being omitted for reasons of clarity, FIG.

2 : the same perspective front view as in

1 wherein the knife block occupies the coupled or active working position and wherein the support plate is omitted and only the rear part of the conveyor is shown in the drawing,

3 a plan view of the device according to 1 .

4 : a section along the line AA 3 .

5 a section along the line BB 4 .

6 FIG. 2 is a perspective rear view of the device with the knife block assuming its coupled or active working position. FIG.

7 : the same view as in 6 in which the knife block assumes its decoupled or inactive working position,

8th : A perspective view of the device, similar to FIG 1 in which the knife block assumes its coupled or active working position and the sewing material is cut, and

9 : the same view as 8th However, the knife block assumes its decoupled or inactive working position and the fabric is therefore not trimmed.

To 1 the drawing shows the Sackzuführvorrichtung invention, the is used in particular in connection with a stationary industrial sewing machine for the production of bag closures, a horizontal support plate 20 through, through the middle region, a through slot 21 extends.

The transit slot 21 serves to accommodate and feed the in 1 Not shown, which on the right side of the support plate 20 in a wedge-shaped extended entrance area 22 is introduced and then transported to the left end, where it is closed in a sewing unit, not shown in the drawing. The sewing unit has been omitted from the drawing for reasons of clarity.

On the support plate 20 are several mounting holes 23 shown, where various functional units, such as guide rails, a folding device, a Reiterbandapparatur, light barriers or the like can be screwed. Then follows then the sewing unit or a welding unit for closing the bags or bags.

Immediately behind the entrance area 22 is a gear box 1 on the support plate 20 attached to the a drive motor 3 is flanged.

In the conveying direction directly behind the gearbox 1 is a knife block 2 provided, relative to the gear box 1 adjustable in height and two round, rotatable cutting blades 11 and 14 carries, wherein the cutting blades are arranged transversely to the conveying direction of the sewing material opposite each other. It is a knife as a bottom knife 11 and the other as upper knife 14 educated.

As in particular the 2 to 5 it can be seen on both sides of the passage slot 21 arranged a conveyor, which serves for gripping the bags below the seam edges to be closed or to be closed and for feeding the bags to the subsequent sewing unit or to other processing units.

The in the area of the passage slot 21 the support plate 20 arranged, serving as Nähgutzuführung conveyor 6 consists of two link chains 24 whose mutually facing strands seize the material and lead through the entire device.

The endless link chains 24 be with the help of the engine 3 and the output waves 4 in the gearbox 1 driven gear driven.

In 2 is just one of the two from the gearbox 1 led out output shafts 4 shown. This has at its lower end a toothed or sprocket 5 on, which with the individual links of the link chain 24 combs and drives them in the conveying direction. The same happens over the second in 2 not shown output shaft 4 , which is driven in opposite directions and with a corresponding toothed or sprocket 5 the second link chain 24 drives.

For the knife drive, the linear movement of serving for Nähgutzuführung conveyor 6 by means of a toothed or sprocket wheel 7 converted into a rotational movement. The toothed or sprocket wheel 7 , which with the in 2 illustrated rear link chain 24 combs, drives a lower shaft 8th at the top, above the support plate 20 located end has the lower part of a positive connection. Through the course of the rear link chain in the drawing 24 becomes the lower part of the positive connection 9 constantly driven, that is, this when the conveyor 6 is on, constantly rotating.

The shaft of the lower knife 11 has at its lower end the upper part 10 the plug-in connection with the lower part 9 the connector is positively coupled.

The coupling and disengaging takes place in that the knife block 2 relative to the stationarily arranged gearbox 1 is movable up and down.

In the in 2 illustrated lowered position of the knife block 2 grab the lower part 9 and the upper part 10 the interlocking connector into each other, so that the lower blade 11 at running link chain 24 over the toothed or sprocket wheel 7 , the lower shaft 8th as well as the lower part 9 the positive connection is driven.

For driving the upper knife 14 serve two gears 12 and 13 , which sit at the upper ends of the knife axes and mesh with each other.

The upper knife 14 lies on the bottom knife 11 on, so that the sewing material in the in 2 illustrated position of the knife 11 and 14 can be cropped at its upper end.

If the material to be fed is not to be cut according to the respective specifications, the knife block becomes 2 relative to the gearbox 1 moved up so that the two parts 9 and 10 the plug connection separated and the knives 11 and 14 in the in 1 shown raised position in which they are outside the passage area of the sewing material.

In 6 and 7 showing a rear perspective view of the device is the adjustability of the knife block 2 relative to the gearbox 1 illustrated in the vertical direction between a lower and an upper working position.

To achieve the adjustability is the knife block 2 on its back with a profile beam 17 provided with at least one vertical guide groove 25 Is provided.

The gearbox 1 has on its back also on a profile carrier, in the 6 and 7 with the position number 18 is marked. The profile carrier 18 is with at least one horizontal guide groove 26 Mistake. At the horizontal guide groove 26 of the gear box 1 belonging profile carrier 18 is by means of screws 19 an elbow 16 attached to the back of the knife block 2 connected profile carrier 17 is applied.

By the on the profile carrier 17 of the knife block 2 adjacent leg of the elbow 16 engages a clamping element in the vertical guide groove 25 of the profile carrier 17 , The clamping element not shown in detail in the drawing is on the accessible rear side of the knife block 2 with a hand-operated clamping lever 15 provided so that it can be easily solved and detected.

In the dissolved state, the knife block 2 be moved up and down in the vertical direction, with in 6 the coupled or active working position of the knife block 2 is illustrated while 7 the decoupled or inactive working position of the knife block 2 shows.

At the in 6 shown view, the profile carrier 17 on the elbow 16 facing side two vertical guide grooves 25 on, wherein the second groove for additional fixation of the knife block 2 at the elbow 16 serves.

For the initial installation, the upper part must be previously 10 the positive connection to the lower part 9 the positive connection are aligned in alignment. The knife block 2 is thus defined in the two horizontally extending coordinates. To adjust the vertical coordinate, the clamping lever 15 solved and the knife block 2 moved so far until it reaches the desired height. In this position, the clamping lever 15 tightened by hand again so that the knife block 2 is fixed in the required height.

In the 8th and 9 are once again the lower and upper working position of the knife block 2 illustrated.

From the right side, the sewing material enters the extended entrance area 22 of the transit slot 21 introduced, which in the present case are sacks 27 is. The upper edges of the sacks 27 can be brought into a predetermined position with an upstream sack spreader, so they are comfortable in the entrance area 22 the support plate 20 can be introduced.

At the in 8th The view shown is the knife block 2 in its lower working position, in which the knives 11 and 14 , as described above, are driven. The upper edges 28 the passing sacks 27 are pruned and the waste pieces 29 away. In a following sewing unit, not shown, the upper, cropped edges are then closed.

In the illustration according to 9 , is the knife block 2 moved to its upper position, in which the knives 11 and 14 occupy their inactive position and are not driven due to the separate parts of the connector.

As is apparent from the drawing 9 Obviously, the sacks are running 27 into the device, are guided below the knife and leave the Sachzuführvorrichtung untrimmed.

In the following, not shown in the drawing units, the upper edges can then be folded as needed and then sewn in the sewing unit.

The newly developed Sackzuführvorrichtung invention offers considerable technical progress, since according to their flexibility, the fabric of the desired application in one and the same machine can be processed accordingly, the upper sack edges can either be circumcised on the one hand and remain uncircumcised on the other hand. The knife block 2 can by simple manual operation of the clamping lever 15 be brought into the desired working position very quickly, which no complicated conversions of the machine are required. This eliminates additional set-up times and set-up costs.

LIST OF REFERENCE NUMBERS

1

gearbox

2

knife block

3

drive motor

4

Output shafts of the gearbox 1

5

Toothed or sprocket wheel

6

Conveyor / Nähgutzuführungen

7

Toothed or sprocket wheel

8th

lower shaft

9

lower part of the positive connection

10

upper part of the positive connection

11

lower blade

12

gear

13

gear

14

upper blade

15

clamping lever

16

elbow

17

profile support

18

profile support

19

screw

20

support plate

21

Through slot

22

Entrance area of the passage slot 21

23

mounting holes

24

link chains

25

vertical guide grooves of the profile carrier 17

26

horizontal guide grooves of the profile carrier 18

27

bags

28

upper edge of the sacks 27

29

trimmings

Claims (10)

Bag feed device, in particular for a stationary industrial sewing machine, welding device or the like for the production of bag closures, consisting of - a substantially horizontally arranged carrying plate ( 20 ), - in the longitudinal direction of the support plate ( 20 ) extending through slot ( 21 ), - one on both sides of the passage slot ( 21 ) arranged conveyor ( 6 ) for gripping the bags ( 27 ) below the suture edges to be sutured or closed ( 28 ) and for feeding the sacks ( 27 ) to a sewing unit, welding device or the like, - a near the entrance area ( 22 ) of the passage slot ( 21 ) on the support plate ( 20 ), with a drive motor ( 3 ) connected gear box ( 1 ) whose output waves ( 4 ) with the conveyor ( 6 ) are in operative connection and set in motion, and - two opposing, drivable, rotating about substantially vertical axes cutting blades ( 11 . 14 ), characterized in that - the rotating cutting blades ( 11 . 14 ) in a separately formed knife block ( 2 ) and that - the knife block ( 2 ) relative to the gearbox ( 1 ) is arranged displaceably in the vertical direction between a lower active and an upper inactive working position and can be fixed in these working positions. Sack feeder according to claim 1, characterized in that the knife block ( 2 ) with a profile carrier ( 17 ), which has at least one vertical guide groove ( 25 ), and that in the guide groove ( 25 ) engaging fastener is provided, which in the guide groove ( 25 ) by actuating a clamping lever ( 15 ) and the knife block ( 2 ) relative to the gearbox ( 1 ) fixed. Sackfehrvorrichtung according to claim 1 or 2, characterized in that in the region of at least one of the two knife axes, a rotatable power transmission element is provided, which by means of the conveyor ( 6 ) and in the lower active working position with the corresponding blade axis can be coupled. Sackfeeding device according to one of claims 1 to 3, characterized in that the lower front end of at least one of the knife axes with an upper part ( 10 ) is provided a positive-locking connector, that the rotatable power transmission element as a complementary lower part ( 9 ) is equipped with a positive connection and that the upper and lower parts ( 9 . 10 ) of the plug connection in the lower operating position of the knife block ( 2 ) are coupled together. Sackfehrvorrichtung according to one of claims 1 to 4, characterized in that only one of the two knife axes by means of the force transmission element is driven, while the second knife axis via a gear transmission (gears 12 . 13 ) is in communication with the first knife axis. Sackfeeding device according to one of claims 1 to 5, characterized in that in the region of the passage slot ( 21 ) of the support plate ( 20 ), serving as a sewing feed conveyor ( 6 ) has two endless drive elements, each of which by means of an output shaft ( 4 ) of the gear box ( 1 ) are drivable. Sackfehrvorrichtung according to claim 6, characterized in that the endless drive elements as link chains ( 24 ) are formed, the mutually facing strand serve to transport the material. Sackfeeding device according to claim 7, characterized in that the endless link chains ( 24 ) by on the output shafts ( 4 ) of the gear box ( 1 ) sitting toothed or sprocket wheels ( 5 ) are drivable. Sackfeeding device according to one of claims 6 to 8, characterized in that the rotational movement of the lower part ( 9 ) of the positive plug connection via a transmission element of the endless drive element (link chain 24 ) is derivable. Sack feeding device according to one of claims 6 to 9, characterized in that as a transmission element, a toothed or sprocket ( 7 ) provided with the corresponding link chain ( 24 ) and the linear movement of the link chain ( 24 ) in a rotational movement of the lower part ( 9 ) of the connector.

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