RU2662659C2 - Device for arrangement of pieces of fabric on sewing machines - Google Patents

Abstract

FIELD: sewing.

SUBSTANCE: invention relates to a device for arrangement of pieces of fabric on sewing machines. In particular, said device is configured to remove a piece of fabric from the loading device, to position a piece of fabric in a necessary manner and transport a piece of fabric to the sewing machine.

EFFECT: proposed is a device for arrangement of pieces of fabric on sewing machines.

10 cl, 21 dwg

Description

The invention generally relates to a device for placing pieces of fabric on sewing machines. More specifically, this device is configured to remove a piece of fabric from a loading device, place a piece of fabric in the desired manner, and transport the piece of fabric to the sewing machine.

It is known that a piece of fabric when using sewing machines is placed in the correct position to obtain an exact seam.

For this, automatic sewing machines are usually equipped with suitable devices that place a piece of fabric in the desired way.

However, these devices do not always guarantee optimal and fast enough placement of a piece of fabric. In fact, in devices according to the prior art there is no way to guarantee the exact repeatability of the placement operations.

The purpose and purpose of the present invention is to eliminate the above, as well as other disadvantages by implementing a device for placing pieces of fabric on sewing machines ..

In particular, an object of the present invention is to provide a device adapted to accurately and quickly place a piece of fabric on a sewing machine.

Another objective of the present invention is the provision of a device for placing a piece of fabric on a sewing machine that does not require specialized operators for the initial location of the pieces of fabric.

The above and other objectives are achieved according to the present invention by means of a device for placing a piece of fabric on sewing machines, comprising a loading device with a movable mechanical arm, which, in turn, contains at least one gripping element. The device is characterized in that the gripping element comprises a block from which the first hook and the second hook protrude, which are located at a distance from each other and are arranged to move relative to each other so that the first hook and the second hook are removed from each other or approach each other to friend; moreover, the first hook has a pointed end that faces the half-space opposite the half-space in which the second hook is located and, similarly, the second hook has a pointed end that faces the half-space opposite the half-space in which the first hook is located, so that when the gripping element is placed side by side with a piece of fabric, the first hook and second hook are removed from each other and capture a piece of fabric.

With this device, according to the present invention, the capture of the tissue needed to move is achieved by the relative distance of the two hooks that engage a piece of fabric by applying a tensile force to said fabric; thus, moving only one hook in the opposite direction from the other hook is sufficient.

In the device according to the present invention, the first hook can be attached to a first cartridge movable within a first hollow cylindrical body located in the block, the first cartridge being configured to move in the first direction by the first fluid under pressure.

Thus, one hook or both hooks can be moved using a pneumatic system that delivers air under pressure and causes the movable cartridge to move with the hook attached to it inside the corresponding hollow cylinder.

Preferably, according to the present invention, the device may comprise a first resilient means which is connected to the first cartridge and is configured to withstand the movement imparted by the first fluid under pressure to move the first cartridge in a second direction opposite to the first direction.

Thus, when the pneumatic system is not activated, each hook attached to the cartridge with elastic means is pushed to its extreme, initial position. Thus, the device can move the hooks to their original position. This position is suitably set without energy consumption by the pneumatic system.

In addition, a through hole may be provided at the end of the first hollow cylindrical body, which is configured to pass at least one part of the first cartridge while moving the first cartridge in the first direction.

Thus, it is possible to determine the position of the hooks, which during the capture phase will be hidden between the block and the piece of fabric, simply by looking at the sides of the gripping elements.

Preferably, the hole is made in the block, and in the specified hole the first hollow cylindrical body is installed in a position controlled by fixing means.

Using this element, you can change the extreme position of the hooks depending on the desired capture and movement of a piece of fabric.

In addition, the device may have a symmetrical structure in which the second hook can also be attached to a second cartridge movable within a second hollow cylindrical body, said second cartridge being movable in a second direction by the first fluid under pressure, said second direction opposite to the first direction.

In other words, when placing the first cartridge and the second cartridge next to each other and moving them along the same axis, it is enough to introduce air into the chamber located between the two cartridges to move the cartridges from each other and to move the hooks apart.

Like the first cartridge, the second resilient means is contained in and connected to the second cartridge, and is also configured to counteract the movement imparted by the first fluid under pressure to move the second cartridge in the first direction.

Thus, when the pneumatic system is not activated, both hooks are pushed in opposite directions to approach each other.

Preferably, the device according to the present invention may comprise a first plate movable relative to the block, the first through slotted hole and the second through slotted hole being made in the first plate so that when the first plate approaches the block, the first hook and second hook protrude from the first slotted holes and a second slot hole, respectively, and when removing the first plate from the block, the first hook and second hook are closed by the first plate.

Using the first plate, you can close two hooks and obtain a device configuration that provides maximum security, since intentional or unintentional contact of the operator with both hooks is excluded.

To maintain the device in this configuration inoperative, elastic means may be provided that are capable of pushing the first plate away from the block.

In addition, a second plate may be provided, connected to the first plate by at least one rod, the second plate being movable by at least one piston so as to bring the first plate closer to the block by pulling the first hook and the second hook from the first plate through the first slot hole and the second slot hole.

Preferably, the device according to the present invention may comprise at least one adjusting screw that is configured to adjust the minimum distance of the first plate from the block in order to control the maximum outflow of the first hook and second hook from the first plate through the first slotted hole and second slotted hole hole.

Further features and details of the present invention will be better understood from the description below, which is presented as an example (the invention is not limited to this example), as well as from the accompanying drawings, in which:

In FIG. 1 is a perspective view of a device according to the present invention;

In FIG. 2, 3 are a perspective view of a loading device constituting part of the device of FIG. 1 and side view, respectively;

In FIG. 4 shows a bottom view of a mechanical arm that is part of the loading device of FIG. 2;

In FIG. 5a and 5b show axonometric bottom views of a gripping member constituting part of the mechanical arm of FIG. 4, according to two different operating configurations;

In FIG. 6a and 6b are sectional side views of the gripping member shown in FIG. 5a and 5b, respectively, made along a first section plane;

In FIG. 7a and 7b are sectional side views of the gripping member shown in FIG. 5a and 5b, respectively, made along a second section plane;

In FIG. 8 is a sectional side view of the gripping member shown in FIG. 5a made along a third section plane;

In FIG. 9 is a plan view of the gripping member of FIG. 5a-8;

In FIG. 10 shows a perspective view of a plate constituting part of the positioning mechanism of the device of FIG. one;

In FIG. 11, 12 show a side view and an axonometric view, respectively, of a positioning device, on the plate of which there is a piece of fabric that needs to be placed in the right way;

In FIG. 13 is a side view of the device of FIG. 1 in the next working phase, in which a piece of fabric is positioned as desired with the plate depicted in FIG. 10;

In FIG. 14 is a side view of the device of FIG. 1 in the next working phase, in which the pliers of the transport device capture a piece of tissue located on the positioning device;

In FIG. 15 is a perspective view of a positioning device in which a piece of tissue is positioned in a desired manner;

In FIG. 16 is a perspective view of the boot device of FIG. 2 in the first working phase, in which there is a capture of a piece of tissue;

In FIG. 17, 18 are axonometric views of the device of FIG. 1, in the last working phases in which the transport device is retracted and moved to place a piece of fabric on the sewing machine.

According to the attached figures, in particular FIG. 1, reference numeral 10 denotes a device for placing pieces of fabric on sewing machines, comprising a loading device 12, a positioning device 14, and a transport device 16.

The loading device 12 is configured to grab a piece of fabric P from the trolley 18 for transporting pieces of fabric and lower this piece of fabric P onto a plate 52 contained in the positioning device 14.

The piece of fabric P is located in the desired position by means of the positioning device 14 and is captured from this position by the pliers 80, 82, 86, 88 of the transport device 16 for placing the piece of fabric in the desired position on the sewing machine.

The boot device 12, shown in detail in FIG. 2 and 3, comprises a main support 20, on which a trolley 18 for pieces of fabric is located, as well as a lifting device 22.

The trolley 18 for pieces of fabric contains a main tray 19 to which a handle 21 is attached. The first side 23 and the second side 25 are connected to the main tray 19. Both sides have vertical rods. Pieces of fabric P are placed between the first side 23 and the second side 25. The position of both sides is adjusted so that pieces of fabric P of various shapes and sizes can be placed.

The lifting device 22 includes a lower part 24, attached to the main support 20 and containing the slide 26, which can slide the movable base 28, moved by the first drive 27 having a stem 30.

The vertical structure 32 is attached to the movable base 28. The mechanical arm 34 can be moved vertically along the vertical structure 32 by the second drive 43. The mechanical arm 34 is divided into two ends, which are provided with a gripping element 36.

The gripping element 36 comprises a block 37, from which a first pair of hooks protrudes, namely a first hook 40 and a second hook 42, and a second pair of hooks, also called a first hook 40 and a second hook 42, protrudes, as shown in FIG. 5b.

The first hook 40 and the second hook 42 of both pairs of hooks and both gripping elements 36 are spaced apart and movable relative to each other so that the first hook 40 and the second hook 42 can move away from each other or come closer to each other.

Each first hook 40 has a pointed end that is directed opposite to the place where the corresponding second hook 42 is held and, similarly, every second hook 42 has a pointed end that is oriented opposite to the place where the corresponding first hook 40 is held, so that when by placing the gripping element next to the piece of fabric P, the first hook 40 and the second hook 42 were moved apart and gripped a piece of fabric P.

According to FIG. 5a, 5b, 6a, 6b, 7a, 7b, the first plate 33 and the second plate 43 are located on the lower surface and the upper surface of the block 37, respectively. These plates are connected to each other at a fixed distance by means of pins 35 and are movable relative to block 37.

The distance between the first plate 33 and the second plate 43 is greater than the thickness of the block 37, so that according to two different configurations, the first plate 33 or the second plate 43 can be removed from the block 37.

Four slotted holes 45, 47 are made in the first plate 33 in accordance with hooks 40, 42 so that hooks 40, 42 can pass through these slotted holes. In particular, the first hook 40 and the second hook 42 pass through the first slotted hole 45 and the second slotted hole 47, respectively.

Two pistons 31 connected via a connector 29 to the central pneumatic system, when activated, push the second plate 43 up and, therefore, the first plate 33 against the springs located coaxially with the pins 35 (not shown in the drawings).

In other words, when these two pistons 31 are not actuated, the first plate 33 is in the lower position shown in FIG. 5a, 6a, 7a and 8, since the first plate 33 is ejected by springs that are coaxial with the pins 35. Thus, the first plate 33 prevents accidental contact of the hooks 40, 42 with a piece of fabric P.

When the two pistons 31 are driven, the second plate 43 is pushed up and, therefore, also the first plate 33 is moved to the block 37, allowing the hooks 40, 42 to exit through the slotted holes 45, 47.

As shown in FIG. 8 and 9, the adjusting screws 55 are also located in the block 37. The adjusting screws 55 are distinguished by their screwing movement due to the disk springs 57, which provide the ability to adjust the minimum possible distance between the first plate 33 and the lower surface of the block 37. Thus, it is possible to adjust the maximum extension hooks 40, 42 to the outside, the position being adjusted according to the type of fabric being gripped.

Since the hooks are identical in structure and function, an explanation is given regarding one pair of hooks, namely, the first hook 40 and the second hook 42 are removed from each other and approach each other depending on the required conditions.

In the initial position, the first hook 40 and the second hook 42 are located close to each other, whereas when they come into contact with a piece of fabric P to grab it, they are removed from each other to engage the fabric.

The first hook 40 is attached to the first cartridge 48, which is arranged to move between two extreme positions in the first hollow cylinder 38; in particular, the first cartridge 48 is formed by two cylinders having different diameters, and a cylinder having a smaller diameter is placed in the first spring 50, which counteracts movement in the direction of the first cartridge 48.

Similarly, the second hook 42 is attached to the second cartridge 46, which is arranged to move between two extreme positions in the second hollow cylinder 51; in particular, the second cartridge 46 is also formed by two cylinders having different diameters, and a cylinder having a smaller diameter is located in the second spring 49, which counteracts movement in the direction of the second cartridge 46.

Block 37 has two through holes 37. Each of these two through holes receives a first hollow cylinder 38 with a first cartridge on which the first hook 40 is mounted, and a second hollow cylinder 51 with a second cartridge on which the second hook 42 is mounted.

The first hollow cylinder 38 and the second hollow cylinder 51 are mounted in the block 37 at a certain distance between them by the first particle 39 and the second particle 53, respectively, and are symmetrically arranged so that the first spring 50 and the second spring 49 are directed outward.

The space between the first hollow cylinder 38 and the second hollow cylinder 51, each of which has a through hole, interacts through the passage 41 and suitable channels (not shown in the figures) with the pneumatic system.

Thus, by such a described structure, when the pneumatic system is not actuated and is in its original configuration, the first spring 50 and the second spring 49 hold the first hook 40 and the second hook 42 as close as possible to each other.

Conversely, when air is supplied under pressure through the passage 41, the first cartridge 48 and the second cartridge 46 move outward, in the opposite direction of the forces of the respective springs 50, 49, and the first hook 40 and the second hook 42 are removed from each other and make a movement that provides the ability to capture piece P of tissue.

The positioning device 14, separately shown in FIG. 10, comprises a plate 52 having a substantially rectangular shape, to which a first stop member 54 and a second stop member 56 are attached, which protrude in a direction perpendicular to the plate 52 and are located on the edges of the long side and the short side of the plate 52, respectively.

Through holes 54 are provided in the first stop member 54, one of which in FIG. 10 is shown at 58.

Three pressure devices 60 are located on the plate 52. The pressure devices 60 have rotatable pressure holes 62, respectively, and are connected to the pneumatic system of the device.

Three pumping devices 60 are used to pump air to the surface of the plate 52. Air is transferred to the first thrust element 54 and the second thrust element 56 to exit through the slotted openings 58.

Through this system, a piece of fabric P carelessly located on the plate 52 as shown in FIG. 11 is pushed against the first stop member 54 and the second stop member 56 to precisely position it relative to the transport device 16, which enters the process later.

In addition, the plate 52 also has a first elongated recess 64 located adjacent to the second stop element 56, and three second elongated recesses 66, which are located closer to each other, but at a certain distance and parallel to the first recess 64.

The first recess 64 and one of the three second recesses 66 are used to receive the lower parts of the optionally used clamps of the transport device 16 so that the lower parts of these optionally used ticks are located under the piece of fabric P that you want to capture, without lifting this piece of fabric.

As shown in FIG. 1 and 13, the transport device 16 comprises a support 68, which extends vertically from the main support 20. The drive 70 is mounted perpendicular to the support. The housing 74 is attached to the stem 72 of the actuator 70. The housing 74 is provided with a movable gear rack 76, which is movable relative to this housing 74, as can be seen in FIG. eighteen.

The first pliers 78 are attached to the end of the rack 76 and have an upper shaft 80 and a lower shaft 82, where the lower shaft 82 is vertically movable with respect to the upper shaft 80.

The second pincers 84 are attached to the same gear rack 76 and are located at some distance from the first pincers 78. The second pincers 84 are similar to the first pincers 78. In fact, the second pincers 84 comprise an upper pin 86 and a lower pin 88, where the lower pin 88 is movable vertically direction relative to the upper rod 86.

In addition, the second mites 84 can be installed in different positions and at different distances from the mites 78, depending on the width of the transported piece of fabric P.

The following description describes the operation of the device 10.

When the device 10 is inoperative, that is, when the pneumatic system is turned off, the first hooks 40 and second hooks 42 of the gripping elements 36 of the device 10 are located close to each other and all hooks are always closed by the first plates 33, which are pushed down by the springs of the pins 35. This guarantees optimal safety conditions, because in this way the contact of the operator with hooks is prevented.

As shown in FIG. 12, at the beginning of the operation, after the operator has placed the trolley 18 for pieces of fabric, filled with pieces of fabric that needs to be sewn, on the main support 20, the loading device 12 lowers the mechanical arm 34 to bring two gripping elements 36 to the first piece P of fabric, located on top.

Thus, two gripping elements 36 are located next to the upper piece P of fabric.

The pistons 31 are driven by raising the second plates 43 in order to bring the first plates to the blocks 37 of the two gripping elements 36.

Thus, the first hooks 40 and the second hooks 42 extend from the slotted openings 45, 47 and are close to each other, because the pneumatic system does not yet supply air under pressure through the passage 41.

To capture the piece P of tissue, the pneumatic system delivers air between the first cartridge 48 and the second cartridge 46 to push them towards the outside of the block 37.

Thus, the first hook 40 and the second hook 42 are removed from each other and, through this movement, the hooks grab a piece P of fabric.

In particular, when the first cartridge 48 and the second cartridge 46 are pushed out, a cylinder of smaller diameter of each of the two cartridges leaves the hole made in the outer end of each hollow cylinder 38, 51. Thus, the operator can easily determine the position of the hooks 40, 42 by simple observation for exciting elements 36.

Then, the mechanical arm 34 rises, as shown in FIG. 2, by actuating the actuator 43 in the vertical structure 32.

The mechanical arm 34, together with the piece P of tissue, is advanced forward to the positioning device 14 by actuating the actuator 27, the stem 30 of which moves the movable base 28 along the slide 26.

Thus, the piece P of fabric remains located on the plate 52 of the positioning device 14, as shown in FIG. fourteen.

Then, air is supplied to the three injection devices 60 for pumping air onto the surface of the plate 52 in predetermined directions by orienting these injection devices 60 and the corresponding injection holes 62.

Air is transferred to the first thrust member 54 and the second thrust member 56 and exits through the slotted openings 58.

The air stream creates a vacuum on the plate 52 so that the piece of fabric P adjoins one side to the first stop element 54 and the other side to the second stop element 56.

Through this system, the piece of fabric P is located in the desired position without deformation or wrinkling, because the vacuum obtained on the plate 52, guaranteed to provide the desired location of the piece P of fabric next to the specified plate 52.

In order to avoid inadvertent blocking or obstruction by the hooks 40, 42 of the translational movement of part P on the surface of the plate 52, the first plate 33 is lowered by the action of the springs of the pins 35, without actuating the pistons 31 through the pneumatic system. Thus, the hooks 40, 42 are completely hidden between the first plate 33 and the block 37.

Thus, the piece of fabric P is placed exactly relative to the transport device, which enters the process later.

Then, the first pincers 78 and the second pincers 84 are led to the positioning device 14, where the upper rod 80 and the lower pin 82 of the first pincers 78, as well as the upper pin 86 and the lower pin 88 of the second pincers are located at some distance from each other.

In particular, the lower shaft 82 of the first tongs 78 is received in the first recess 64, while the lower shaft 88 of the second tongs 84 is received in one of the three second grooves 66, depending on the position of the second tongs 84 attached to the gear rack 76.

Thus, the two lower rods are located below the piece P of fabric without lifting the specified piece of fabric.

Subsequently, each lower rod is brought to a corresponding upper rod to capture a piece of tissue P, as shown in FIG. 16.

Then, the first pincers 78 and the second pincers 84 with the piece P of tissue are removed from the positioning device 14 by moving the housing 74, which is controlled by the actuator 70.

Finally, the gear rack 76 extends from the housing 74 to move toward the piece of fabric P and supply the specified piece of fabric to the base of the sewing machine, not shown in the drawings.

The precise placement of the piece of fabric P due to movement caused by the positioning device 14 is controlled by the laser control system 90, which checks the alignment of the piece of fabric P by projecting a line onto the piece of fabric P.

A person skilled in the art can provide for changes or variations that need to be considered as being within the scope of the legal protection of the present invention.

Claims (18)

1. Device (10) for placing a piece (P) of fabric on a sewing machine, comprising a loading device (12) with a movable mechanical arm (34), which contains at least one gripping element (36), in which the gripping element (36) comprises a block (37), from which the first hook (40) and the second hook (42) protrude, spaced apart from each other and configured to move relative to each other so that the first hook (40) and the second hook (42) are removed from each other or close to each other; the first hook (40) has a pointed end that faces the half-space opposite the half-space in which the second hook (42) is located, the second hook (42) has a pointed end that faces the half-space opposite the half-space in which the first hook (40) is located, so that when the gripping element (36) is placed next to the piece of fabric (P), the first hook (40) and the second hook (42) are removed from each other and capture a piece (P) of tissue, characterized in that contains the first plate (33), made with the possibility of movement relative to the block (37), as well as the first through slotted hole (45) and the second through slotted hole (47), which are made in the first plate (33) so that when approaching the first the plates (33) to the block (37), the first hook (40) and the second hook (42) protruded from the first slotted hole (45) and the second slotted hole (47), respectively, and when the first plate (33) was removed from the block (37) ) the first hook (40) and the second hook (42) were covered by the first plate (33). 2. The device (10) according to claim 1, which contains a third elastic means, which is made with the possibility of repulsion of the first plate (33) from the block (37). 3. The device (10) according to claim 1 or 2, which contains a second plate (43) connected to the first plate by means of at least one pin (35), moreover, the second plate (43) is arranged to move at least one piston (31), so as to bring the first plate (33) closer to the block (37) by pulling the first hook (40) and the second hook (42) from the first plate (33 ) through the first slotted hole (45) and the second slotted hole (47). 4. The device (10) according to one of paragraphs. 1-3, which contains at least one adjusting screw (55), configured to adjust the minimum distance of the first plate (33) from the block (37) so as to adjust the maximum extension of the first hook (40) and the second hook (42) from the first plate (33) through the first slotted hole (45) and the second slotted hole (47). 5. The device (10) according to claim 1, in which the first hook (40) is attached to the first cartridge (48), made with the possibility of movement in the first hollow cylindrical body (38) located in the block (37), moreover, the first cartridge (48) is configured to move in the first direction of the first fluid under pressure. 6. The device (10) according to claim 5, which contains the first elastic means (50) connected to the first cartridge (48) and configured to counteract the movement imparted by the first fluid under pressure, so as to move the first cartridge (48) in a second direction opposite the first direction. 7. The device (10) according to claim 5 or 6, wherein a through hole is made at the end of the first hollow cylindrical body (38), through which at least one part of the first cartridge (48) is allowed to pass when the first cartridge (48) is moved in the first direction. 8. The device (10) according to one of paragraphs. 5-7, in which the hole is made in the block (37), in which the first hollow cylindrical body (38) is fixed in a position regulated by the fixing means (39). 9. The device (10) according to one of paragraphs. 5-8, in which the second hook (42) is attached to the second cartridge (46), made with the possibility of movement in the second hollow cylindrical body (51), moreover, the second cartridge (46) is configured to move in the second direction of the first fluid under pressure, and the specified second direction is opposite to the first direction. 10. The device (10) according to claim 9, which contains a second elastic means (49) connected to the second cartridge (46) and configured to resist movement imparted by the first fluid under pressure, so as to move the second cartridge (46 ) in the first direction.

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