EP3116696B1 - Sack feeding device with adaptive knife block - Google Patents

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 sack-known closures, 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. A bag feeder according to the preamble of independent claim 1 is known from the document US-A-3,720,559 , When using stationary sewing machines for bag closures, it often happens that the upper bag edges do not need to be circumcised or circumcised. In such cases, then another stationary sack feed must be used, which has no built-cutting blades.

So far it has been necessary to maintain two different stationary machines for the two fields of application.

The invention is therefore based on the object to make such a sack feeding device such that it is suitable for the use of both said methods, that is, that they can work without major set-up both with cutting knives and without 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 with the cutting blades relative to the gear box between an active and an inactive working position is displaceable and fixable in its predetermined 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.

In a preferred embodiment of the invention, the knife block is slidably disposed relative to the gearbox in the vertical direction between a lower and an upper working position. Such a design has the advantage that the machine can be used extremely space-saving, since no lateral displacement or pivoting of the knife block is required.

The knife block can be equipped with a profile carrier with at least one vertical guide groove, while on the gear box, a provided with a clamping lever angle piece is arranged. The clamping lever has expediently engaging in the guide groove fastener, which is fixable in the guide by actuating the clamping lever.

To drive the knives, a separate drive may be provided which is directly connected to the knives. but preferably the knife drive is effected by the already existing conveyor. This is done by arranging 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 selectively coupled to the corresponding blade axis. 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 strands for transport serve the sewing material. 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.

Fig. 1:

eine perspektivische Vorderansicht der erfindungsgemäßen Sackzuführvorrichtung, wobei der Messerblock seine entkoppelte bzw. inaktive Arbeitsposition einnimmt und wobei aus Gründen der Übersichtlichkeit die folgenden Bearbeitungseinheiten weggelassen worden sind,

Fig. 2:

die gleiche perspektivische Vorderansicht wie in Fig. 1, wobei der Messerblock die gekoppelte bzw. aktive Arbeitsposition einnimmt und wobei die Tragplatte weggelassen und nur der in der Zeichnung hintere Teil der Fördereinrichtung dargestellt ist,

Fig. 3:

eine Draufsicht auf die Vorrichtung gemäß Fig. 1,

Fig. 4:

einen Schnitt entlang der Linie A-A aus Fig. 3,

Fig. 5:

einen Schnitt entlang der Linie B-B aus Fig. 4,

Fig. 6:

eine perspektivische Rückansicht der Vorrichtung, wobei der Messerblock seine gekoppelte bzw. aktive Arbeitsposition einnimmt,

Fig. 7:

die gleiche Ansicht wie in Fig. 6, wobei der Messerblock seine entkoppelte bzw. inaktive Arbeitsposition einnimmt,

Fig. 8:

eine perspektivische Ansicht der Vorrichtung, ähnlich wie in Fig. 1, wobei der Messerblock seine gekoppelte bzw. aktive Arbeitsposition einnimmt und das Nähgut beschnitten wird, und

Fig. 9:

die gleiche Ansicht wie Fig. 8, wobei der Messerblock allerdings seine entkoppelte bzw. inaktive Arbeitsposition einnimmt und das Nähgut folglich nicht beschnitten wird.

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

Fig. 1:

a perspective front view of the bag feeding device according to the invention, wherein the knife block occupies its decoupled or inactive working position and wherein for reasons of clarity, the following processing units have been omitted,

Fig. 2:

the same perspective front view as in Fig. 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 Fig. 1 .

4:

a section along the line AA Fig. 3 .

Fig. 5:

a section along the line BB Fig. 4 .

Fig. 6:

a perspective rear view of the device, wherein the knife block assumes its coupled or active working position,

Fig. 7:

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

Fig. 8:

a perspective view of the device, similar to in Fig. 1 in which the knife block assumes its coupled or active working position and the sewing material is cut, and

Fig. 9:

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

To Fig. 1 In the drawing, the bag feed device according to the invention, which is used in particular in connection with a stationary industrial sewing machine for the production of bag closures, has a horizontal support plate 20, through the middle region of which a through slot 21 extends.

The passage slot 21 serves to receive and supply the in Fig. 1 Not shown, which is introduced on the right side of the support plate 20 in a wedge-shaped widened entrance area 22 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 a plurality of mounting holes 23 are shown, on which various functional units, such as guide rails, a Umfalteinrichtung, a Reiterbandapparatur, photocells or the like can be tightened. Then follows the sewing unit still or a welding unit to close the bags or bags.

Immediately behind the entrance area 22, a gearbox 1 is mounted on the support plate 20, to which a drive motor 3 is flanged.

In the conveying direction immediately behind the gear box 1, a knife block 2 is provided which is adjustable relative to the gear box 1 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. In this case, one knife is designed as a lower blade 11 and the other as upper blade 14.

As in particular the FIGS. 2 to 5 can be seen, on both sides of the passage slot 21, a conveyor is arranged, 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 arranged in the region of the passage slot 21 of the support plate 20, serving as Nähgutzuführung conveyor 6 consists of two link chains 24, whose facing strands seize the fabric and lead through the entire device.

The endless link chains 24 are driven by means of the motor 3 and the output shafts 4 of the transmission box 1 provided in the transmission.

In Fig. 2 only one of the two out of the gearbox 1 led out output shafts 4 is shown. This has at its lower end a toothed or sprocket 5, which meshes with the individual members of the link chain 24 and drives them in the conveying direction. The same happens over the second in Fig. 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 the feeding device 6 serving for conveying means 6 is converted by means of a toothed or sprocket 7 in a rotary motion. The tooth or sprocket 7, which with the in Fig. 2 shown rear link chain 24 meshes, drives a lower shaft 8, which has at its upper, located above the support plate 20 end of the lower part of a positive plug connection. By the course of the rear link chain 24 in the drawing, the lower part of the positive plug connection 9 is constantly driven, that is, this, when the conveyor 6 is turned on, constantly rotates.

The shaft of the lower blade 11 has at its lower end to the upper part 10 of the connector, which is positively coupled with the lower part 9 of the connector.

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

In the in Fig. 2 illustrated lowered position of the knife block 2 engage the lower part 9 and the upper part 10 of the positive plug connection with each other, so that the lower blade 11 driven at running link chain 24 via the toothed or sprocket 7, the lower shaft 8 and the lower part 9 of the positive connection becomes.

To drive the upper blade 14 are two gears 12 and 13, which sit at the upper ends of the blade axes and each other comb.

The upper blade 14 rests on the lower blade 11, so that the fabric in the in Fig. 2 shown position of the knives 11 and 14 can be cropped at its upper end.

If the supplied material to be cut according to the respective requirements, the knife block 2 is moved relative to the gearbox 1 upwards, so that the two parts 9 and 10 of the connector separated from each other and the knives 11 and 14 in the in Fig. 1 shown raised position in which they are outside the passage area of the sewing material.

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

To achieve the adjustability of the knife block 2 is provided on its rear side with a profile support 17 which is equipped with at least one vertical guide groove 25.

The gearbox 1 also has on its rear side a profile carrier, which in the FIGS. 6 and 7 is marked with the position number 18. The profile carrier 18 is provided with at least one horizontal guide groove 26. At the horizontal guide groove 26 of belonging to the gear box 1 profile support 18, an angle piece 16 is fixed by means of screws 19, which abuts against the back of the profile block 17 connected to the knife block 2.

By the voltage applied to the profile carrier 17 of the knife block 2 leg of the elbow 16 engages a clamping element in the vertical guide groove 25 of the profile support 17. The clamping element not shown in detail in the drawing is at the accessible back of the knife block 2 with one of Hand-operated clamping lever 15 provided so that it can be easily solved and found.

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

At the in Fig. 6 shown, the profile carrier 17 on the angle piece 16 side facing two vertical guide grooves 25, wherein the second groove for additional fixation of the knife block 2 on the elbow 16 is used.

During the initial assembly, the upper part 10 of the positive plug connection must first be aligned in alignment with the lower part 9 of the positive plug connection. The knife block 2 is thereby fixed in the two coordinates extending in the horizontal direction. To adjust the vertical coordinate of the clamping lever 15 is released and the knife block 2 is moved so far until it assumes the desired height. In this position, the clamping lever 15 is tightened again by hand, so that the knife block 2 is fixed in the required height.

In the FIGS. 8 and 9 Once again, the lower and upper working position of the knife block 2 are illustrated.

From the right side, the fabric is introduced into the extended entrance area 22 of the passage slot 21, which in the present case are bags 27. The upper edges of the bags 27 can be brought into a predetermined position with an upstream bag spreader so that they can be easily inserted into the entrance area 22 of the support plate 20.

At the in Fig. 8 view is located 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 of the passing bags 27 are thereby trimmed and the debris 29 is removed. In a following sewing unit, not shown, the upper, cropped edges are then closed.

In the illustration according to Fig. 9 the knife block 2 is 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 Fig. 9 As can be seen, the bags 27 enter the device, are guided below the knives and leave the material feeding device 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 be brought by simple manual operation of the clamping lever 15 very quickly in the desired working position, whereby no costly conversions of the machine are required. This eliminates additional set-up times and set-up costs.

Sack feeder with adaptive knife block LIST OF REFERENCE NUMBERS

1

gearbox

2

knife block

3

drive motor

4

Output shafts of the gear box 1

5

Toothed or sprocket wheel

6

Conveyor / Sewing material supply

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 17th

26

horizontal guide grooves of the profile carrier 18th

27

bags

28

upper edge of the sacks 27

29

trimmings

Claims (11)

1. Bag feed-in device, in particular for a stationary industrial sewing machine, welding device or the like for the production of bag closures, consisting in

   - a supporting plate (20) placed substantially horizontally (20),

   - a passage slit (21) extending in the longitudinal direction of the supporting plate (20),

   - a conveyor (6) placed on both sides of the passage slit (21) for gripping the bags (27) below the upper bag edges (28) to be sewn or to be closed and for feeding the bags (27) to a sewing unit, a welding device or the like,

   - a gearbox (1) connected with a drive motor (3) placed on the supporting plate (20) close to the input area (22) of the passage slit (21), gearbox the output shafts (4) of which are in operative connection with the conveyor (6) and set it in motion, as well as

   - two drivable cutting knives (11, 14) opposite each other, rotating about substantially vertical axes that are mounted in a separately formed knife block (2),

   characterized in

   - that the knife block (2) with the knives (11, 14) can be moved relative to the gearbox (1) between an active and an inactive working position and that can be fixed in its predefined working positions.
2. Bag feed-in device according to claim 1, characterized in that the knife block (2) is placed slidable relative to the gearbox (1) in vertical direction between a lower and an upper working position.
3. Bag feed-in device according to claim 1 or 2, characterized in that the knife block (2) is provided with a profile support (17) with at least one vertical guiding groove (25), that an angle piece (16) provided with a clamping lever (15) is placed on the gearbox (1) and that the clamping lever (15) has a fixing element engaging into the guiding groove (25) that can be fixed in the guiding groove (25) by actuating the clamping lever (15) .
4. Bag feed-in device according to one of the claims 1 to 3, characterized in that a rotatable power transmission element is provided in the area of at least one of the two knife axes, power transmission element that can be driven by means of the conveyor (6) and that can selectively be coupled to the corresponding knife axis.
5. Bag feed-in device according to one of the claims 1 to 4, characterized in that the lower front end of at least one of the knife axes is provided with an upper part (10) of a form-fitting plug-in connection, that the rotating power transmission element is provided as a complementary lower part (9) of a form-fitting plug-in connection and that the upper and the lower part 9, 10) of the plug-in connection can be coupled with each other in the lower working position of the knife block (2).
6. Bag feed-in device according to one of the claims 1 to 5, characterized in that only one of the two knife axes is driven by means of the power transmission element while the other knife axis is in connection with the first knife axis over a gear drive (toothed wheels 12, 13) .
7. Bag feed-in device according to one of the claims 1 to 6, characterized in that the conveyor (6) serving as sewing unit feeder, placed in the area of the passage slit (21) of the supporting plate (20), has two endless driving elements, each of which can be driven by means of an output shaft (4) of the gearbox (1).
8. Bag feed-in device according to claim 7, characterized in that the endless driving elements are configured as link chains (24), the facing strands of which serve to the transport of the goods to be sewn.
9. Bag feed-in device according to claim 7, characterized in that the endless link chains (24) can be driven by toothed wheels or chain wheels (5) that are placed on the output shafts (4) of the gearbox (1).
10. Bag feed-in device according to one of the claims 7 to 9, characterized in that the rotating movement of the lower part (9) of the form-fitting plug-in connection can be derived over a transmission element from the endless driving element (link chain 24).
11. Bag feed-in device according to one of the claims 7 to 10, characterized in that a toothed wheel or chain wheel (7) that is in connection with the corresponding link chain (24) and that converts the linear movement of the link chain (24) into a rotation movement of the lower part (9) of the plug-in connection is provided as a transmission element.

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