TWI766683B - An apparatus and a method for opening ends of tubular web pieces to make block bottom bags - Google Patents

Abstract

The invention relates to an apparatus and a method for opening ends of tubular web pieces (2) to make squared or block bottoms. Apparatus comprises an end-opening device (7), two rotating differentials (22, 26) positioned angularly to the plane of web pieces (2). Each differential (22, 26) has a shaft on which a pair of splaying elements (8, 9) formed by shaping bars into curvilinear shape is mounted. Splaying elements (8, 8A, 9, 9A) form a three-dimensional virtual shape upon rotation. Individual layers of the bag body at its open-end portion are spread apart by guiding elements (7A, 7B) of opening device (7) near one corner to form an opening at the bottom into which one of the splaying elements is inserted. Continued rotational motion of drives ensures that both splaying elements enter the opening and gradually and continually spread apart from each other the layers of web pieces (2) at open end to form a block bottom.

Description

Apparatus and method for opening an end of a tubular fabric piece to make a bottom cover bag

The present invention relates to an apparatus and method for opening the ends of tubular fabric pieces to make square bottoms or back covers.

The production of back cover bags generally involves: providing tubular fabric material obtained by producing a tubular material fabric or by joining the longitudinal edges of a flat material fabric in order to obtain a tubular configuration; cutting the tubular material to obtain a suitable length of a bag body; and a bag bottom is formed by properly folding and closing one end of the bag body. A bag with a rectangular bottom produced in this way is commonly referred to as a box bag by experts in the field.

To form the bottom of a box bag, the end portion of one of the two bag walls stacked on top of each other in a flattened bag is folded along a fold line extending transversely to the longitudinal axis of the bag such that The ends of the bag body adopt a hexagonal folded configuration with two parallel seams facing each other and two pairs of parallel folded edges facing each other. By folding the two seams towards each other and securing the folded lobes including the seams to each other or to a flap, the bag body has a bottom that adopts a rectangular configuration when the completed bag is folded apart . It is also possible to apply a valve panel prior to folding the seams towards each other which assumes a tubular configuration when the bag ends are folded to their final shape.

Devices for opening the ends of the tubing to open the bottom square are known and are Part of the bag/sack making device. Here, on the devices described below, in particular those devices comprising woven fabrics of stretched plastic tapes, are processed bag/sack making devices that can handle tubing (preferably plastic) made of any material.

A device for producing sacks has been disclosed in patent application DE 19502251 A1, which describes that a bottom opening means is provided carrying a piston rod for opening a slide member of a bottom square. The slide is moved to a raised position and at the same time extends into the plane of the tube to fold the upper wall of a tube along a fold line on itself. Subsequently, the slide is lowered in the extended position to press against the wall, and then retracted again. In order for the slider to work properly, the hose to be opened must be in a stationary state. Therefore, the supplied piping must be stopped first. After the bottom has been opened, the tube has to be accelerated again for transport to the next processing station.

However, a bottom-on device as disclosed in this DE 19502251 A1 proved to be disadvantageous because it was too slow. In addition, such a device is prone to wear.

Another DE application no. DE912045 discloses a device for a cross bottom bag machine in which a sickle-shaped bottom laying bar or a sickle of a drive is used consisting of a machine drive and two gears driven. This bottom laying rod/sickle, which may be referred to as means for opening in the sense of the patent application, is moved at least partly in the conveying direction of the hose piece and in the extension direction. Gears and machine drives can be considered as a first moving member. However, the sickle-shaped bottom laying rod/sickle only touches the hose piece at certain points, so that the hose piece, especially if it etc. contains tissue plastic strips, often cannot be safely opened.

Additionally, in the prior art, bottom opening stations were used with rotary deployment tools having an upper and lower portion that moved apart during orbital movement of a mechanism. However, such multi-part deployment tools are disadvantageous because they are complex and error-prone. Also, these expander tools require a lot of setup.

Yet another example of a bag opening device is disclosed in EP3148788A1 ('788), which shows a device and method for forming bottom openings between bag segments, wherein the clusters of wedge-shaped elements have complex geometries. The ('788) patent further discloses that the wedge elements are driven by a common drive. The main drawback of this invention is that no wedge-shaped elements are provided to accommodate a wide range of bags. Another disadvantage of the invention ('788) is that the bag bottom width cannot be changed while the machine is running. Yet another disadvantage that can be stated with reference to the invention ('788) is that when all wedge elements are driven by a single drive, it is impossible to correct for errors due to movement of the wedge elements during the bag making procedure.

Other devices for opening the bottom of the tube are also disclosed, for example, in US 6328683 or US 6042526, however, these devices do not meet the requirements of the bottom opening end for high speed and rapid adjustment of openings of different sizes and tubular fabric widths. Require. Furthermore, these devices involve very complex procedures and movement of various components, which reduces the overall efficiency and accuracy of the system.

Therefore, there is a need for an opening device that can operate at high speed, operate with low maintenance costs, and be easily set up for different material specifications.

The present invention provides a device for bottom opening, by which the disadvantages of the prior art are overcome and which is robust, reliable and at the same time requires little maintenance and allows production speeds much higher than those of the systems known in the art .

Purpose of the present invention:

An object of the present invention is to provide a bottom opening device that can be operated accurately at high speed.

Another object of the present invention is to provide an apparatus that is easy to set up for processing different types of tubular fabric materials.

Another object of the present invention is to provide a device for quick adjustment to different sizes Apparatus and method for opening and tubular fabric width.

Another object of the present invention is to provide a device with minimal wear and easy maintenance.

Yet another object of the present invention is to provide a device that produces bottom openings with high precision and reliability in continuous operation and wherein the device is simple in structure.

According to the present invention, there is provided a device for opening the end of a bag. In an automated bag making line, a number of procedures are carried out by which a tubular or a flat fabric is converted into a bag. A number of workstations are provided to carry out these procedures. Some of these stations are:

- A fabric roll feed member in which a roll of woven or non-woven fabric is loaded to feed the fabric in the forward direction.

- Fabric edge guide and unwind member, wherein the fabric is guided over the drum and unwound from the fabric roll

fabric fabric preparatory member, wherein

- The preparatory member optionally consists of a fabric perforating member that removes all air pockets between the fabric layers for smooth operation

- The preparatory member consists of the mounting positioning hole punching member as needed

- Fabric cleaning elements

●Detection and sensing components for sensing the quality of fabrics

Fabric length cutting member to cut fabric at desired bag length

●Conveying means for conveying the fabric towards different areas of bag making

Transverse transfer and guide/feed members, which change the direction of the fabric from longitudinal to transverse to for bag formation

- Defect rejection means that rejects defective fabric prior to bag formation

- Top and bottom edge opening members in which both the side top and side bottom edges of the fabric are opened or folded

- Vertically positioned edge opener

- Opening member with rotating mechanism

Valve patch storage, transfer and sticking means where a patch is applied to the folded fabric prior to making the valve

- Folding member that folds the edge of the fabric with the valve patch to form a valve

a further conveying member which will further convey the bag with a valve at one end to a further station

● stacking member for bag storage

The device of the present invention, designed to provide opening of the bag ends in an automated bag making line, comprises two rotary drives positioned at an angle relative to the plane of movement of the cut fabric pieces. Each of the rotary drives has a shaft on which a pair of extension elements are mounted. The extension elements are formed by molding the rod or rod into a curvilinear shape. The positioning of the two drives is such that during any complete rotation of the individual extending elements, a three-dimensional virtual shape corresponding to each element is formed. The two virtual shapes are partially annular relative to each other.

During conveyance on the conveying device, the individual layers of the bag body at the open end portion of the tubular bag body are spread apart by guiding elements near one of the corners to form an initial opening at the bottom.

To open the bag, one of the pair of extension elements in the shape of a raised profile is inserted into the initial opening. The continuous rotational movement of the drive ensures that the two extending elements enter the initial opening and gradually And the layers of the bag body at the open end are continuously unfolded and separated from each other to form a seal bottom. Furthermore, the bag ends are pressed to form a hexagonal shape by another pair of extension elements driven by a separate driver.

1: Device of the present invention

2: Tubular fabric pieces

2A: Upper section

2B: Lower Section

2C: Open end area

2D: Upper section with bottom opening

2D': lower section below bottom opening

2E: Fabric Piece Opening

3: Transmission table

4: Belt

5: Conveying direction

6: Longitudinal extension shaft

7: Turn on the device

7A: Upper guide element

7A’: Upper Guide Surface

7B: Lower guide element

7B': Lower guide surface

8: The first upper extension element

8A: First lower extension element

8B: First wedge surface

8C: First wedge extension

8D: First wedge end

8E: First wedge collar

9: Second upper extension element

9A: Second lower extension element

9B: Second wedge surface

9C: Second wedge extension

9D: Second wedge end

9E: Second wedge collar

10: The first motor

11: First gear

12: Shaft

13: Second gear

13A: The first flanged pulley

14: Third gear

15: Fourth gear

16: Fifth gear

16A: Second flanged pulley

17: Idler

18: Toothed belt

19: Mounting plate

20: The first rotatable shaft

21: The first adjustable base

21A: Right arm

21B: Left arm

21C: Sliding Tray

21D: Adjustment knob

22: 1st differential

23: Second motor

24: Second rotatable shaft

25: Second adjustable base

26: Second differential

27: Base Frame

28: Upper part of the support plate

29: The lower part of the support plate

30: Connection board

31: Opening

32: Axis A

33: Axis B

34: Axis C

35: Axis D

36: Lock Knob

37: The first differential shaft

38: Second differential shaft

39: Axis E

40: Axis F

Figure 1 shows a perspective view of the bag making line

Figure 1A shows a flow chart of a procedure for opening the end of the bag

(a) Tubular cut fabric pieces

(b) Initial opening by guiding element

(c) inserting the first extension element to form an opening

(d) Press the opening form by the second extension element

(e) Bags with open ends

Figure 2 shows the device of the present invention

Figure 3 shows a perspective view of the opening device

Figures 4, 4A, 4B show different stages of bag opening including an initial opening stage

4C, 4D show enlarged views of pocket opening by extension element

Figure 5 shows the extension element and its equal movement

Figure 1 shows a bag making line for the production of bags in which a fabric material is processed in various stations to form a finished back cover bag or back cover valve bag. The machine comprises various units, one of which is a cutting unit (not shown) for the purpose of cutting or separating the fabric material into tubular fabric pieces (2). The tubular fabric piece (2) comprises two pocket sections, ie an upper section (2A) and a lower section (2B) stacked on each other, wherein each pocket section (2A, 2B) may consist of a plurality of layers of different materials. The tubular fabric pieces (2) are transferred over the transfer table (3) by means of a moving belt (4). at the transfer table (3) Above, the tubular fabric pieces (2) are continuously conveyed in the conveying direction (5) transverse to their longitudinally extending axes (6) shown in Figures 4, 4A, 4B.

A device (1) of the invention for forming a bottom opening (2D) between the bag sections (2A, 2B) at the open end region (2C) of the tubular fabric element (2) is associated with a bag making line The subsequent units are then placed in-line so that the tubular fabric pieces (2), when opened by the device (1), can be transferred over the transfer table (3) from a state in which they are stacked flat on each other to a state in which they are spaced apart from each other to the next. Station for perfect back cover opening.

Subsequent units of the bag making line are provided to carry out these procedures. Some of these follow-on units are:

- A fabric roll feeding member in which a roll of woven or non-woven fabric is loaded to feed the fabric in the forward direction.

- Fabric edge guide and unwind member, wherein the fabric is guided over the drum and unwound from the fabric roll

fabric fabric preparatory member, wherein

- The preparatory member optionally consists of a fabric perforating member that removes all air pockets between the fabric layers for smooth operation

- The preparatory member consists of the mounting positioning hole punching member as needed

- Fabric cleaning elements

●Detection and sensing components for sensing the quality of fabrics

Fabric length cutting member to cut fabric at desired bag length

●Conveying means for conveying the fabric towards different areas of bag making

Transverse transfer and guide/feed members, which change the direction of the fabric from longitudinal to transverse to for bag formation

- Defect rejection means that rejects defective fabric prior to bag formation

- Top and bottom edge opening members in which both the side top and side bottom edges of the fabric are opened or folded

- Vertically positioned edge opener

- Opening member with rotating mechanism

Valve patch storage, transfer and sticking means where a patch is applied to the folded fabric prior to making the valve

- Folding member that folds the edge of the fabric with the valve patch to form a valve

a further conveying member which will further convey the bag with a valve at one end to a further station

● stacking member for bag storage

Figure 2 shows the device (1) of the invention comprising an opening device (7), an upper support plate (28), a lower support plate (29) and a transfer table (3) with a belt (4). The upper support plate ( 28 ) and the lower support plate ( 29 ) are identical in construction but are placed in mirror images of each other so that an opening ( 31 ) or gap is created for the ease of the tubular fabric piece ( 2 ) in the conveying direction ( 5 ) march. Furthermore, the upper and lower support plates (28, 29) are well connected by a connecting plate (30) so that a desired opening (31) is constant throughout the bag making process.

In one embodiment, the upper and lower support plates (28, 29) may be made of a sheet or plate and be strong enough to withstand the load of other components such as pulleys, rollers, belts and drives (not shown).

In another embodiment, the connecting plate (30) is constructed of a plate or sheet, metallic or non-metallic, to provide a connection between the upper and lower support plates (28, 29).

Furthermore, the connecting plate (30) is rigidly attached to the base frame (27). The base frame (27) may be constructed with a rectangular cross-section, or any other suitable shape, so that it can bear the load of the device (1) of the present invention.

An opening device (7) is mounted on the mounting plate (19) and connected to the base frame (27) via a first rotatable shaft (20) which rotates as required during the bag making procedure . With this adjustment, a variety of bags can be made with the custom back cover width ("h") shown in Figure 4B.

Figure 3 shows a perspective view of the opening means (7) comprising an upper guide element (7A) with an upper guide surface (7A') rising upwards in the conveying direction (5) and with One of the lower guide elements (7B) of the lower guide surfaces (7B') is lowered downwards in the conveying direction (5). The guide elements (7A, 7B) are provided with endless belts (4) such that the endless belts are driven by a first motor (10) to provide rotational movement to the belts. The guide elements (7A, 7B) are each connected to a suction element (not shown) for ensuring that the tubular member (2), among others, travels through the guide element with a suction force in a manner well known to those skilled in the art Adhesion to guide elements (7A, 7B) during (7A, 7B).

In one embodiment, the motor (10) may be selected from a set of asynchronous motors, stepper motors, or any type of motor that provides discrete step motion to adjacent parts.

The upper guide element (7A) and the lower guide element (7B) are connected via the meshing of the third gear (14) and the second gear (13) respectively and further the second gear (13) is meshed with the first gear (11) . The motor (10) is connected with the first gear (11) through a shaft (12) so that the power and rotational movement of the motor (10) are transmitted to the respective gears (13, 14). This gear meshing system ensures equal rotational speeds to the belts of the upper guide element (7A) and the lower guide element (7B). The equal rotational speed of the belts ensures that the upper section (2A) and the lower section (2B) open symmetrically with respect to the conveying direction (5).

An opening means (7) further comprises as shown in Fig. 4 penetrating between the pocket segments (2A, 2B) at the open end region (2C) of the tubular fabric member (2) to form an opening (2E) Pairs of extension elements (8, 8A). There is at least a pair of first extension elements, ie a first upper and a first lower extension element (8, 8A), such that they rotate about axis C (34) and axis E (39).

Furthermore, a drive mechanism is provided to ensure synchronization of the movement of the pair of first extension elements (8, 8A) with the tubular fabric piece (2) during the end opening procedure. The drive mechanism includes several pulleys and belts so that the power is finally transmitted from the first motor (10) to the first extension element (8, 8A). A first flanged pulley (13A) is coupled to a second gear (13) driven by a first motor (10). The first flanged pulley (13A) is further connected to the second flanged pulley (16A) via a toothed belt (18). The belt (18) ensures efficient power transmission from one pulley to the other. There is an idler (17) to provide a specified tension to the toothed belt (18) so that any dross in the belt can be overcome by adjusting the idler (17). Such adjustment of the idler pulley (17) to provide tension in the belt (18) is well known to those skilled in the art. A fifth gear (16) is provided and coupled with the second flanged pulley (16A) to obtain equal rotation achieved in the second flanged pulley (16A). Furthermore, the fifth gear (16) is meshed with the fourth gear (15). The two gears (15, 16) are rotated at equal speed as provided by the first motor (10).

Furthermore, the first upper and first lower extension elements (8, 8A) are individually connected to the fourth gear (15) and the fifth gear (16) via separate first differentials (22), respectively. The first differential (22) may be of any type such that it transmits the movement of the respective gears due to the first motor (10) to the rotational movement of the first extension element (8, 8A).

In one embodiment, the meshing of the gears (15, 16) provides equal rotational movement to the first extension element (8, 8A) so that the tubular fabric piece (2) opens equally to the upper section (2A) and the lower section segment (2B) to form an opening (2E).

As shown in Figure 2, the gears (11, 13, 14, 16 and 15) together with the extension elements (8, 8A) are all mounted on a mounting plate (19) and the guide elements (7A, 7B) are attached to A first rotatable shaft (20). The first rotatable shaft member (20) is mounted on a first adjustable base (21) that can rotate around an axis A (32). In addition, the first adjustable base (21) includes a right arm (21A), a left arm (21B), a sliding tray (21C) and an adjustment knob (21D).

In one embodiment, the adjustable base (21) can be made of a metal or non-metal plate such that it can withstand the weight of the components mounted thereon.

In another embodiment, the right and left arms (21A, 21B) may be made of a square or angled cross-section with grooves so that the sliding tray (21C) can easily slide over it with minimal friction. This sliding of the sliding tray (21C) over the arms (21A, 21B) can be achieved by using any kind of sliding mechanism, such as ball bearings on rails, rack and pinion, lead screw arrangements, linear motors, etc.

The opening device (7) further comprises a pair of second extension elements (9, 9A) pressed against the open end of the tubular fabric piece (2) as shown in Figures 4A, 4B The upper and lower sections (2D, 2D') at the top region (2C) are placed over the pocket sections (2A, 2B) to form a bottom opening, thereby forming a bottom opening (2D). There are at least one pair of second extension elements, ie second upper and second lower extension elements (9, 9A), such that they rotate about axes D and F (35, 40). The second extension elements (9, 9A) are attached to corresponding respective second differentials (26), which in turn are connected to a second differential via a single second differential shaft (38) motor (23). The second differential (26) may be of any type such that it transmits the rotational movement of the second motor (23) to the rotational movement of the second extension element (9, 9A). The second motor (23) is mounted on a second rotatable shaft member (24).

To accommodate various tubular fabric pieces (2) and also to change the height of the bottom opening (2D) "h", as shown in Figure 4B, can vary the distance between the extension elements (8, 8A, 9, 9A) and the support plates (28, 29), respectively. The first rotatable shaft member (20) can be adjusted by rotating the first rotatable shaft member (20) around the axis A (32) and by the first adjustment base (21) via above the arms (21A, 21B) This change is done by sliding the tray (21C) and locking the tray (21C) with the knob (21D). Alternatively, the second rotatable shaft (24) can be adjusted by rotating the second rotatable shaft (24) about an axis B (33) over the second adjustable base (25), and the This is achieved by the position of the second rotatable shaft ( 24 ) locked by the locking knob ( 36 ), as can be seen from FIG. 3 .

As shown in Fig. 5, the first upper and first lower extension elements (8, 8A) are identical in construction, in the arrangement shown in Fig. 5, they are respectively along the opposite axes (34, 39) Move clockwise. The first extension element (8, 8A) comprises a first wedge-shaped surface (8B), a first wedge-shaped extension (8C), a first wedge-shaped end (8D) so that it forms one piece. The first wedge-shaped surface (8B) consists of a sheet metal part or can be machined and bent at an acute angle so that it can easily enter the corner (2C) of the tubular member (2) to further open the tubular fabric member (2) Upper and lower sections (2A, 2B). Furthermore, a first wedge-shaped extension (8C) connects the first wedge-shaped surface (8B) with the first wedge-shaped end (8D). A first wedge collar (8E) is provided to form a connection with one of the first differentials (22).

The first wedge-shaped extension (8C) may be formed of the same material as the first wedge-shaped surface (8B), which may be slightly curved so that it does not interfere with other moving elements (such as the second extension element) during movement .

Furthermore, the first wedge-shaped end (8D) is a solid body on which a counterweight (not shown) can be mounted to provide accurate rotation of the first extension element (8, 8A) about the axis (34, 39).

Furthermore, the first wedge-shaped collar (8E) may be made of a hollow tube or have a tubular cross-section such that one end is fixed to the first wedge-shaped extension (8C) and the other end is press fit to the first differential Speeder (22). This fixing can also be achieved by bolting, screwing or welding.

As further shown in Figure 5, the second upper and lower extension elements (9, 9A) are identical in construction, moving in a counter-clockwise direction about axes (33, 40), respectively. The second extension element (9, 9A) comprises a second wedge-shaped surface (9B), a second wedge-shaped extension (9C), a second wedge-shaped end (9D), so that it forms one piece. The second wedge-shaped surface (9B) is constituted by a rod such that it is bent at an angle greater than 90° and rounded at the corners to provide a smooth profile such that it presses against the second extension element (9, 9A) Friction is reduced in the upper and lower sections (2A, 2B) of the tubular fabric piece (2). Furthermore, a second wedge-shaped extension (9C) connects the second wedge-shaped surface (9B) with the second wedge-shaped end (9D). A second wedge collar (9E) is provided to form a connection with one of the second differentials (26).

The second wedge-shaped extension (9C) may be constructed of sheet metal or may be machined and attached to a second wedge-shaped surface (9B), which may be profiled to reduce its weight and also constructed such that It does not interfere with other moving elements during movement.

Again, the second wedge-shaped end (9D) is a solid body on which a counterweight (not shown) can be mounted to provide accurate rotation of the extension elements (9, 9A) about the axes (33, 40).

Furthermore, the second wedge collar (9E) may be made of a hollow tube or have a tubular cross-section such that one end is fixed to the second wedge extension (9C) and the other end is press fit to the second differential (26) . This fixing can also be achieved by bolting, screwing or welding.

1A and 4, 4A, 4B, 4C, and 4D show one method for forming a bottom opening at the open end of a tubular fabric piece.

Specifically, Figure 1A shows the following stages:

(a) Tubular cut fabric pieces

(b) Initial opening by guiding element

(c) inserting the first extension element to form an opening

(d) Press the opening form by the second extension element

(e) Bags with open ends

4, 4A, 4B, 4C, and 4D show some of these stages in detail.

The method of opening the ends of a tubular fabric piece into a closed bottom involves the following steps:

a. Conveying the tubular fabric piece (2) over a conveying table (3) via a belt (4);

b. The tubular fabric piece (2) enters the opening (31) so that the upper part of the support plate (28) and the lower part of the support plate (29) respectively form a barrier for the upper section (2A) and the lower section (2B) and the tubular fabric piece ( 2) Move in the conveying direction (5);

c. The two sections (2A, 2B) are separated by the upper guide element (7A) and the lower guide element (7B) above the upper guide surface (7A') and the lower guide surface (7B') respectively draw;

d. When the tubular fabric piece (2) is further advanced by the movement of the guide surfaces (7A', 7B') arranged by means of the first motor (10) and the gears (12, 13, 14), a fabric piece is produced opening (2E);

e. The first upper extension element (8) opens the upper section (2A) of the fabric piece (2) and the first lower extension element (8A) opens the lower section (2B) of the fabric piece (2).

f. The tubular fabric piece (2) is advanced further and the second extension element (9, 9A) is rotated counterclockwise by the second motor (23) about an axis D (35);

g. Furthermore, the second upper extension element (9) presses the bottom opening upper section (2D) and the second lower extension element (9A) presses the bottom opening lower section (2D') to push the tubular fabric piece (2) Open to back cover opening.

The above description does not discuss each side of the machine in detail, as the prior art machines on the operating and drive sides are nearly identically constructed so as to be able to work simultaneously at both ends of the tubular. As apparent from the foregoing description, the present invention has several embodiments.

While the above description contains many specificities, these should not be construed as limiting the scope of the invention, but as exemplifications of one of its preferred embodiments. It must be recognized that modifications and variations based on the disclosure given above are possible without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined not by the illustrated embodiments, but by the invention as a whole and the scope of the appended claims and their legal equivalents.

7: Turn on the device

7A: Upper guide element

7A’: Upper Guide Surface

7B: Lower guide element

7B': Lower guide surface

8: The first upper extension element

8A: First lower extension element

9: Second upper extension element

9A: Second lower extension element

10: The first motor

11: First gear

12: Shaft

13: Second gear

13A: The first flanged pulley

14: Third gear

15: Fourth gear

16: Fifth gear

16A: Second flanged pulley

17: Idler

18: Toothed belt

20: The first rotatable shaft

21: The first adjustable base

21A: Right arm

21B: Left arm

21C: Sliding Tray

21D: Adjustment knob

22: 1st differential

23: Second motor

24: Second rotatable shaft

25: Second adjustable base

26: Second differential

27: Base Frame

32: Axis A

33: Axis B

34: Axis C

35: Axis D

36: Lock Knob

37: The first differential shaft

38: Second differential shaft

39: Axis E

40: Axis F

Claims (23)

A device for opening the end of a tubular fabric piece (2) to make a bottom closure bag, characterized in that the device (1) comprises: an end opening means (7) consisting of: an upper guide element (7A) having an upper guide surface (7A') rising upwards in the conveying direction (5) of the tubular fabric piece (2), and having a lower guide descending downwards in the conveying direction (5) a lower guide element (7B) of the surface (7B'); the upper and lower guide elements (7A, 7B) are connected via the meshing of a third gear (14) and a second gear (13), respectively, And the second gear (13) meshes with a first gear (11); a pair of first extension elements (8, 8A) penetrating the tubular fabric piece (2) at the open end region (2C) An opening (2E) is thus formed between the pocket segments (2A, 2B), the pair of first extension elements (8, 8A) are positioned to rotate about corresponding axes (34, 39) inclined with respect to the vertical; Two extension elements (9, 9A) which press over the pocket section (2A, 2B) at the open end region (2C) of the tubular fabric piece (2) to form bottom open upper and lower sections ( 2D, 2D'), thereby forming a bottom opening (2D), the pair of second extension elements (9, 9A) positioned to rotate about corresponding axes (35, 40) inclined with respect to the vertical; an upper support plate (28) ) and a lower support plate (29), the support plates (28, 29) are placed in mirror images of each other such that an opening (31) or gap is created between them; a connecting plate (30), the support plates ( 28, 29) are fixedly attached to the web (30), which is rigidly attached to a base frame (27); a transfer table (3) with an endless belt (4), the tubular The fabric pieces (2) are continuously conveyed on the conveying table (3) in the conveying direction (5) transverse to their longitudinally extending axis (6). 2. The device of claim 1, wherein the upper and lower support plates (28, 29) are made of a sheet or plate and the connecting plate (30) is made of a metal or non-metallic plate or sheet. The device of claim 1 or 2, wherein the base frame (27) has a rectangular cross-section, and the connection of the opening device (7) to the base frame (27) is adjustable. The device of claim 1 or 2, wherein the endless belt (4) is driven by a first motor (10). A device as claimed in claim 1 or 2, wherein the guide elements (7A, 7B) are each connected to a suction element which pairs the tubulars running over the guide elements (7A, 7B) piece (2) to apply suction. The device of claim 1 or 2, wherein the motor (10) is connected to the first gear (11) through a shaft (12) and in turn transmits power and rotational movement to the second gear (13) and the first gear (13) Three gears (14). An apparatus as claimed in claim 1 or 2, wherein a drive mechanism is provided for driving the tubular fabric piece (2) through the final transmission of power from the first motor (10) to the pair of first extension elements (8, 8A). The movement of the pair of first extension elements (8, 8A) and the tubular fabric pieces (2) is synchronized during the end opening procedure. The device of claim 7, wherein the drive mechanism comprises: a first flanged pulley (13A) coupled to the second gear (13) and directly driven by a first motor (10), a second flanged pulley (13A) A flanged pulley (16A), which is driven by the first flanged pulley (13A) via a toothed belt (18), an idler pulley (17), which provides the toothed belt (18) with a specified tension of a A fifth gear (16) coupled to the second flanged pulley (16A) and meshing with a fourth gear (15), wherein the fourth gear (15) and the fifth gear (16) are equal speed rotation. 8. The device of claim 8, wherein the pair of first extension elements (8, 8A) are individually connected to the fourth gear (15) and the fifth gear (16) via separate first differentials (22), respectively ). A device as claimed in claim 1 or 2, wherein the rotational speeds of the pair of first extension elements (8, 8A) are equal. The device of claim 1 or 2, wherein the distance between the pair of first extension elements (8, 8A) and the pair of second extension elements (9, 9A) and the support plates (28, 29) is variable. The device of claim 1 or 2, wherein the first, second, third, fourth and fifth gears (11, 13, 14, 16 and 15) are all mounted on a first rotatable shaft attached to The first rotatable shaft member (20) is then mounted on a first adjustable base (21) supported directly by the base frame (27). The device of claim 12, wherein the first adjustable base (21) comprises a right arm (21A), a left arm (21B), a sliding tray (21C) capable of sliding over the arms (21A and 21B), and fix the sliding tray (21C) to an adjustment knob (21D) in a specific position. The device of claim 12, wherein the right and left arms (21A, 21B) have a square or angled cross-section and have grooves for facilitating the sliding of the sliding tray (21C) and can use rails such as rails A sliding mechanism over which a ball bearing, rack and pinion, lead screw arrangement, or a linear motor slides above. A device as claimed in claim 1 or 2, wherein the second extension elements (9, 9A) are attached to corresponding individual ones which are in turn connected to a second motor (23) via a single second differential shaft (38) A second differential (26), and wherein the second motor (23) is mounted on a second rotatable shaft (24) attached to a second adjustable base (25). The device of claim 1 or 2, wherein the second rotatable shaft member (24) is locked in position by a locking knob (36). The device of claim 1 or 2, wherein each of the pair of first extension elements (8, 8A) comprises a first wedge-shaped surface (8B) and a first wedge-shaped end (8D), and the first wedge-shaped The surface (8B) and the first wedge-shaped end (8D) integrally connect a first wedge-shaped extension (8C), and the pair of first extension elements (8, 8A) are connected to the respective first differential (22) One of the first wedge collars (8E). The device of claim 1 or 2, wherein each of the pair of second extension elements (9, 9A) comprises a second wedge-shaped surface (9B) and a second wedge-shaped end (9D), and the second wedge-shaped The surface (9B) and the second wedge-shaped end (9D) integrally connect a second wedge-shaped extension (9C), and the pair of second extension elements (9, 9A) are connected to the respective second differential (26) A second wedge collar (9E). 19. The device of claim 18, wherein the second wedge-shaped surface (9B) consists of a linear member having a smooth surface and is curved to form an inclusive angle greater than 90°. The device of claim 1 or 2, wherein the first wedge-shaped surface (8B) is curved to have a convex shape that does not interfere with other moving elements. The device of claim 17, wherein a counterweight is mounted on the first wedge-shaped end (8D) and/or on the second wedge-shaped end (9D). 2. The device of claim 1 or 2, wherein respective motors drive the pair of first extension elements (8, 8A) and the pair of second extension elements (9, 9A). A method of opening the ends of a tubular fabric piece into a closed bottom using a device as claimed in claims 1 to 22, the method comprising the steps of: a. conveying the tubular fabric piece (2) over a transfer table (3) via a belt (4) b. Pass the tubular fabric piece (2) through the opening (31) so that the upper part of the support plate (28) and the lower part of the support plate (29) respectively form a barrier of the upper section (2A) and the lower section (2B) and The tubular fabric piece moves in the conveying direction (5); c. sucking the upper section (2A) and the upper guide element (7A) and the lower guide element (7B) by passing over the upper guide surface (7A') and the lower guide surface (7B') respectively the lower section (2B); d. the bag section (2A, 2B) at the open end region (2C) penetrating the tubular fabric piece (2) using the pair of first extension elements (8, 8A) ) to form an opening (2E), wherein the pair of first extension elements (8, 8A) is composed of a first upper extension element (8) and a first lower extension element (8A), here The tubular fabric is then moved by the guide surfaces (7A', 7B) driven by the first motor (10) and the first, second and third gears (11, 13 and 14) Piece (2) is further advanced; e. Simultaneously opening the upper section (2A) of the tubular fabric piece (2) with the first upper extension element (8) and opening the tubular fabric with the first lower extension element (8A) the lower section (2B) of the piece (2); f. advancing the tubular fabric piece (2) further and using the second motor (23) to make one of the pair of second extension elements (9, 9A) first The two upper extension elements (9) rotate around the axis (35) and thereby press the upper section (2D) of the bottom opening and simultaneously make one of the pair of second extension elements (9, 9A) a second lower extension element (9A) Rotate to press the lower section (2D') of the bottom opening to open the tubular fabric piece (2) into a closed bottom opening.

Images