TW202210285A - 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 valve panel assumes a tubular configuration when the bag ends are folded to their final shape.

The means for opening the ends of the tubing to open the bottom square are known and part of the bag/sack making means. 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 this 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 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:

It is an object of the present invention 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 and method for rapidly adjusting to different sized openings and tubular fabric widths.

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 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 unwinding member in which the fabric is guided over the drum and unwound from the fabric roll ● Fabric fabric preparation members, wherein - The preparatory member optionally consists of a fabric perforation member that removes all air pockets between the fabric layers for smooth operation - The preparatory component is composed of the installation positioning hole punching component as needed - Fabric cleaning element ● 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 that change the direction of the fabric from machine to cross for bag formation ● Defect rejection member, which 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 opening member - 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 ● Further conveying means, which will further convey the bag with valve at one end to a further station ● Stacking elements for storing bags

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 driver ensures that the two spreading elements enter the initial opening and gradually and continuously spread the layers of the bag body at the open end apart from each other to form a closed bottom. Furthermore, the bag ends are pressed to form a hexagonal shape by another pair of extension elements driven by a separate driver.

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-sealed bag or back-sealed 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 top of each other, wherein each pocket section (2A, 2B) may consist of a plurality of layers of different materials. The tubular fabric piece (2) is transferred over the transfer table (3) by means of a moving belt (4). Above the transfer table ( 3 ), the tubular fabric pieces ( 2 ) are continuously conveyed in the conveying direction ( 5 ) transverse to their longitudinally extending axes ( 6 ) shown in FIGS. 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 Subsequent units are then placed in-line so that the tubular fabric pieces (2), when opened by the device (1), can be transferred to the next one above 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. 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 unwinding member in which the fabric is guided over the drum and unwound from the fabric roll ● Fabric fabric preparation members, wherein - The preparatory member optionally consists of a fabric perforation member that removes all air pockets between the fabric layers for smooth operation - The preparatory component is composed of the installation positioning hole punching component as needed - Fabric cleaning element ● 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 that change the direction of the fabric from machine to cross for bag formation ● Defect rejection member, which 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 opening member - 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 ● Further conveying means, which will further convey the bag with valve at one end to a further station ● Stacking elements for storing bags

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 such that an opening (31) or gap is created for the tubular fabric piece (2) in the direction of movement of the fabric (5) Easy to travel on. 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 movement (5) of the fabric.

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 one pair of first extension elements, namely first upper and first lower extension elements (8, 8A), such that they rotate about axes C and E (34, 38).

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) which is rotatable about 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 the various tubular fabric pieces (2) and also to vary the height "h" of the bottom opening (2D), as shown in Figure 4B, the extension elements (8, 8A, 9, 9A) and the support plate (28) can be varied, respectively , 29). 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 (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. The tubular fabric piece (2) is conveyed 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 moving 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 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 further advanced and the second extension element (9, 9A) is rotated counterclockwise around an axis D (35) by the second motor (23); 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.

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: The moving direction of the fabric 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

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 cover bag, characterized in that the device (1) comprises: An end opening device (7) consisting of an upper guide element (7A) having an upper guide surface ( 7A'), and a lower guide element (7B) having a lower guide surface (7B') that descends downwards in the conveying direction (5); the upper and lower guide elements (7A, 7B) are respectively A third gear (14) and a second gear (13) are meshed and connected, and the second gear (13) is meshed with a first gear (11); a pair of first extension elements (8, 8A), It penetrates between the pocket sections (2A, 2B) at the open end region (2C) of the tubular fabric piece (2) to form an opening (2E), the extension elements (8, 8A) positioned to Rotation about corresponding axes (34, 39) inclined with respect to the vertical; a pair of second extension elements (9, 9A) pressing against the pocket at the open end region (2C) of the tubular fabric piece (2) above segments (2A, 2B) to form bottom opening upper and lower sections (2D, 2D'), thereby forming a bottom opening (2D), the second extension elements (9, 9A) are positioned to surround relative to The corresponding axis (35, 40) of the vertical tilt is rotated; an upper support plate (28) and a lower support plate (29), the support plates (28, 29) being placed in mirror images of each other such that an opening (31) or gap is created between them; a connecting plate (30) to which the support plates (28, 29) are fixedly attached, the connecting plate (30) being rigidly attached to a base frame (27); A conveying table (3) with an endless belt (4) on which the tubular fabric piece (2) is continued in the conveying direction (5) transverse to its equal longitudinal extension axis (6) ground transmission. 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 respective gears (13, 14). A device 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 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 (16A) driven by the first flanged pulley (13A) via a toothed belt (18), An idler pulley (17) that provides a specified tension to the toothed belt (18) a fifth gear (16) coupled to the second flanged pulley (16A) and meshing with a fourth gear (15), Wherein the two gears (15, 16) rotate at the same speed. 8. The device of claim 8, wherein the first upper and first lower extension elements (8, 8A) are individually connected to the four gears (15) and the four gears (15) and the Fifth gear (16). A device as claimed in claim 1 or 2, wherein the rotational movements of the first extension elements (8, 8A) are equal. A device as claimed in claim 1 or 2, wherein the distance between the first and second extension elements (8, 8A and 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 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 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 second extension elements (9, 9A) comprises a second wedge-shaped surface (9B) and a second wedge-shaped end (9D), and the second wedge-shaped Surface (9B) and the second wedge-shaped end (9D) integrally connect a second wedge-shaped extension (9C), and the 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). An apparatus as claimed in claim 1 or 2, wherein respective motors drive the first and second extension elements (8, 8A and 9, 9A). A method of opening an end 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 the transfer table (3) via the 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 for the upper section (2A) and the lower section (2B) and the The tubular fabric piece moves in the conveying movement direction (5); c. suck the two sections (2A, 2A, 7B) by passing the upper guide element (7A) and the lower guide element (7B) over the upper guide surface (7A') and the lower guide surface (7B'), respectively. 2B); d. Use the pair of extension elements (8, 8A) to penetrate between the pocket sections (2A, 2B) at the open end region (2C) of the tubular fabric piece (2) to form an opening (2E) , after which the tubular fabric piece (2) is further moved by the guide surfaces (7A', 7B) driven by the first motor (10) and the gears (12, 13 and 14) go ahead; e. Simultaneously opening the upper section (2A) of the fabric piece (2) with the first upper extension element (8) and opening the lower section (2B) of the fabric piece (2) with the lower extension element (8A) ; f. Advance the tubular fabric piece (2) further and use the second motor (23) to rotate the second upper extension element (9) around the axis (35) and thereby press the upper section (2D) of the bottom opening ), and at the same time rotate the second lower extension element (9A) to press the lower section (2D') of the bottom opening to open the tubular fabric piece (2) into a closed bottom opening.

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