TW201934835A - A method and a device for preventing imprecise stitching on the embroidery ground of an embroidery machine - Google Patents

Abstract

The method for preventing imprecisely set stitching on the embroidery ground (17) of an embroidery machine is achieved due to the fact that the embroidery ground (17) is kept still above and/or below the respective stitching area through needles (41) or holding plates (43) with a high friction. The device comprises a holding plate (43) that is movable against the embroidery ground (17) with needles (41) or elements with a high friction such as naps made of rubber or a foam cushion.

Description

Method and device for preventing inaccurate stitching on embroidery base of embroidery machine

The subject matter of the present invention is a method for preventing inaccurate stitching on the embroidery base of an embroidery machine according to the general term of the patent technical solution 1, and a method for preventing the embroidery base of the embroidery machine according to the general term of the patent technical solution 4. Device for inaccurate sutures.

Modern embroidery machines are capable of sewing 700 stitches on the embroidery base tightened by the grill of the embroidery machine every minute. On this type of embroidery machine, more than 1,000 needles can be arranged, and these needles are distributed at regular intervals over 30 meters and longer. As a result, the embroidery base (ie, the fabric tensioned in the grille) has a corresponding length and weighs several kilograms. As the grille moves each time the stitching is performed, the embroidery base moves in at least one of the two directions X and Y or simultaneously in both directions (this is due to inertia in the X and / or Y directions) Therefore, the length of the stitches may vary across the entire length of the embroidery base. In the upper / lower and left / right end edge regions, the length change is minimal. When the embroidery base moves transversely to the needle inserted with the stitches, this dragging action of the embroidery base (especially at the center part) may also have a negative impact on the embroidery needle. Minimal changes in suture length are also noticeable, which may reduce the aesthetic appearance of the stitched workpiece.

In addition, a large number of stitches (for example, 720 stitches per minute, that is, 12 stitches per second) can cause vibrations in the Z direction (that is, perpendicular to the surface of the embroidery substrate). Because the embroidery base is not close to the embroidery board, the fabric compactor presses the embroidery base on the embroidery board in the x direction (press 12 times per second), and then releases it. These movements may also adversely affect the appearance of the embroidery. As the conventional tensioning distance of the embroidery base between two horizontally running reels increases, such undesirable movement of the embroidery base also increases. In order to design a more efficient embroidery machine, the embroidery surface height of the embroidery machine is as high as 2.8 meters without turning over. In other words, the problems caused by the movement of the embroidery base tensioned between the two reels caused by inertia in the x, y, and z directions become more serious.

An object of the present invention is to create a method and a device for preventing undesired movements in the X, Y, and Z directions or reducing said movements to at least a level invisible to the naked eye, so that embroidery stitched over the entire embroidery area The base has exactly the same stitch length between the 10 reels and the side pull rods.

This object is achieved by a method according to the features of patent solution 1 and a device according to the features of patent solution 4.

Advantageous specific examples of the invention are described in the scope of the accompanying patent application.

Since the holding member is rigidly connected to the grille to act on the embroidery base and keep the fabric fixed in the X and Y directions relative to the grille, the immobilization of the embroidery base is prevented or the embroidery base is prevented from being held by the inertia The movement during the grid movement exceeds the range of the grid movement scale. In an advantageous design, the embroidery base is also fixed in the Z direction, that is, the embroidery base is fixed perpendicular to the plane of the material, which prevents unwanted chatter.

In a first specific example, the pin cushion is formed on the holding members spaced apart a certain distance, and the fine embroidery needles of the pin cushion are pushed through the embroidery base or penetrate into the embroidery base. The holding member is preferably supported on a provided grid support, which is arranged in the grid at regular intervals along the embroidery machine. The pin cushion can be moved outward in the vertical direction (Z direction) onto the embroidery base, so the fabric is held in a precise position and synchronized with the movement of the grille. Since a plurality of these holding members are arranged along the embroidery machine, the embroidery base can no longer move horizontally and vertically with respect to the grille, thereby preventing vertical movement caused by mass inertia. If the pin cushion is pushed forward to the extent that the embroidery base moves slightly from the plane of the embroidery base itself in the Z direction between the scrolls, the vibration in the Z direction can also be reduced.

In order to be able to handle all areas of the embroidery base between the reels without retensioning or rewinding, two holding members are fixed, and the holding members are respectively arranged on the grid supports spaced apart from each other.

In order to deactivate the holding member, pull the needle pad away from the embroidery base in the Z direction until the needle leaves the embroidery base. In addition, the needle pad pivots about a horizontal pivot axis so as to be located on the grid support and further away from the embroidery base. . Of course, the holding member can also pivot about a vertical axis on the side. However, this is not very advantageous because the size of the intermediate space between the grid supports will be reduced accordingly, thereby reducing the maximum lateral path. The holding member can be mechanically pivoted into the working position (that is, perpendicular to the embroidery base), and its needle pad can be moved out and back in the direction of the embroidery base pneumatically or otherwise.

As an alternative to the pin pad, in the second specific example, other pads having a higher coefficient of friction with the embroidery base (such as pads made of rubber, Velcro tape, foam, and the like) can also be fixed to the holding member. To prevent the embroidery base from sliding in the X and Y directions.

In FIG. 1, the grid tower is assigned the reference numeral 1. The tower stands on the base 25 or on the shuttle bracket 3 of the rear bracket. The shuttle bracket contains shuttle driving elements (the shuttle is not shown in the figure) and is used to set the width of the bracket and the height of the grille. Driving member A rail 5 is fixed on the grid tower 1, and two or more brackets 7 are supported on the rail 5 so that the brackets can be moved vertically. The bracket 7 carries a grid support 11 fixed in and on the grid 9.

An upper reel 13 is arranged above the grille 9 and a lower reel 15 is arranged at the lower end, and is shown schematically. The embroidery base 17 is tensioned between the two reels 13,15. This situation is shown with a dashed line.

In addition, two fixed holding members 19 that are schematically shown are respectively fixed to the grid support 11 and spaced apart. In FIG. 1, the upper holding member 19 a and the lower holding member 19 b can be seen. Between the two holding members 19a and 19b, a shuttle bed 21 also referred to as "stöckli" is schematically shown, but its drive device 10 is not shown.

The lower section of the track 5 not fixed on the grid tower 1 extends into the foundation pit 23 between the two bases 25 and is fixed on the left base 25.

In the figure below, the A section in FIG. 1 is shown on an enlarged scale. It shows a first holding member 19 a arranged above the shuttle bed 21, which is fixed on the grill support 11. The second holding member 19b under the shuttle bed 21 is the same as the aforementioned holding member, and is fixed to the grill support 11 in an inverted manner (Section B in FIG. 1).

In the perspective view in FIG. 2, the holding member 19 is shown in detail. The cladding layer 27 of the pivotable portion of the holding member 19 is only shown by a dotted line, so that the details of the mechanical structure of the pivotable portion are completely visible. Using a linear drive device 29 such as a pneumatic or hydraulic cylinder or a spindle that can be driven by an electric motor, the cantilever 31 can be self-parallel to the rest position of the grid support 11 (see Figs. 3 and 4, according to Figs. 1, 2) 5 and 6, the working position is perpendicular to the rest position) pivoting about the pivot axis q.

The cantilever 31 supported on the axis q includes a support member with two parallel cheek plates 33, a second linear driving device 35 is fixed on the support member, and a pin pad 39 is fixed on the driving rod 37 of the support member ( Figure 2 or Figure 4). In the example, the driving lever 37 is supported in the cheek plate 33 in a longitudinally movable manner. The pin pad 39 fixed on the free end of the driving lever 37 includes a holding plate 43 that supports the embroidery needle 41. The holding plate 43 is in a rest position, preferably within the volume of the cladding 27 between the cheek plates 33, so that the embroidery needle 41 does not protrude from the holding plate 43 and is not damaged, and eliminates the risk of injury to the operator .

The structure of the holding member 19 is described in more detail with reference to FIGS. 3 to 6. The first linear drive device 29 is pivotally supported on the bearing bolt 45. The bearing bolt 45 is held by a fixing plate 47. The fixing plate 47 is fixed to the grill support 11 by screws 49. On the grill support, a plurality of holes may be provided for the screws 49 so that the holding member 19 can be fixed at an appropriate point. The piston rod 51 projects upward from the first linear driving device 29. A joint 53 meshed into the shaft 55 is attached to the piston rod 51. The ends of the shaft 55 are fixed in the cladding-forming side walls 27 'and 27 ". Therefore, with the first linear drive device 29, the cladding 27 can be pivoted about the axis q.

The bolt 57 is on the axis q, and at both ends of the bolt 57, the diamond plate 59 is fixed in a non-rotatable manner, respectively. The ends of the plate 59 are screwed to the side walls 27 'and 27 "with screws 61. The rear end of the bolt 57 is connected to the fixing plate 47.

The two linear drives 29, 35 are connected via a hose or line to a correspondingly assigned compressed air source or electrical switch. The compressed air source or electrical switch is not shown in the figure.

The operation of the device and method for preventing inaccurate stitching will now be described below.

The following will be based on the embroidery base 17 tensioned in a common manner on the reels 13, 15 and also pulled horizontally by a tie rod (not shown in the figure) to the lateral side and the grid support 11 in the resting position Component 9 (Figures 3 and 4) describes the method. With the first linear driving device 29, the pin pad 39 disposed in the cladding layer 27 is pivoted at an angle of 90 °. The angle of 90 ° is preferably accurately determined by the end fence 63 on the fixing plate 47. Next, the needle pad 39 and the embroidery needle 41 are pushed onto the holding plate 43 in the Z direction perpendicular to the embroidery base 17. Here, the fine embroidery needle 41 penetrates the embroidery base 17 and, if necessary, presses the fabric slightly to the right in the Z direction, for example, several millimeters. As a result, it is ensured that the embroidery base 17 is not separated from the embroidery needle 41 due to any grill vibration in the Z direction during embroidery.

During the embroidery process, the grille 9 which is tightly connected to the grille support 11 is moved in the X and / or Y direction in a common manner (ie horizontally and vertically) in order to embroider the embroidery base 17 or its stitches and the Embroidery is performed on the length between the stitches, and the embroidery operation has been planned accordingly. Because the holding member 19 with the pin pad 39 now performs exactly the same movement as the grille 9, the embroidery base 17 no longer moves violently with respect to the grille 9 despite the high acceleration and delay. As a result, the embroidery base 17 is always in a precise position relative to the grille 9.

Because a holding member 19 is always arranged on the grill support above and below the embroidery area, it is guaranteed that in the embroidery area, it is possible to keep a region spread over the entire length of the embroidery machine stationary. Therefore, when changing from the upper embroidery area to the lower embroidery area, only the lower needle pad 39 must be withdrawn from the embroidery base 17, and the grille must be moved around the width of the area to be stitched. Next, the embroidery needle 41 moves back into the embroidery base 17 and holds the embroidery base 17 firmly during further processing by the embroidery machine.

As a substitute for the pin pad 39, a rubber plate, a fluffy fabric, a hook tape, a sling, a microcellular foam rubber plate or other pads can also be fixed on the holding plate 43 as a holding element. At the same time, the embroidery base 17 is damaged, especially if the embroidery base material is very fine.

A suitable telescoping rail or telescoping tube will also be possible, and the pin pad 39 is fixed at the end of the telescoping rail or telescoping tube. As a result, no pivoting movement will be required.

1‧‧‧ Grill Tower

3‧‧‧ shuttle

5‧‧‧ track

7‧‧‧ bracket

9‧‧‧ Grille

11‧‧‧ grill support

13‧‧‧Scroll up

15‧‧‧ lower scroll

17‧‧‧ embroidery base

19‧‧‧ holding member

19a‧‧‧ Upper holding member

19b‧‧‧ lower holding member

21‧‧‧ Shuttle bed

23‧‧‧ foundation pit

25‧‧‧ base

27‧‧‧ cladding

271‧‧‧ sidewall

2711‧‧‧ sidewall

29‧‧‧The first linear drive

31‧‧‧ cantilever

33‧‧‧Support

35‧‧‧Second linear drive

37‧‧‧Drive lever

39‧‧‧ pin cushion

41‧‧‧Stitch

43‧‧‧ holding plate

45‧‧‧bearing bolt

47‧‧‧Fixing plate

49‧‧‧screw

51‧‧‧Piston rod

53‧‧‧ connector

55‧‧‧ shaft

57‧‧‧ Bolts

59‧‧‧board

61‧‧‧screw

63‧‧‧End bezel

q‧‧‧ pivot axis

The present invention will be explained in more detail with reference to the illustrated illustrative specific examples, in which: FIG. 1 shows a vertical cross section of an embroidery machine in the area of a grill support, and FIG. 2 shows a detail in FIG. 1 with a retaining member Perspective view, FIG. 3 shows a view of the holding member on the grill support in a rest position, FIG. 4 shows a side view of the holding member on the grill support according to FIG. 3, and FIG. 5 shows the holding member pivoting outward A side view, and FIG. 6 shows a side view of a retaining member in a functional position with an outwardly pivoting pin extension.

Claims (10)

A method for preventing inaccurate stitching on an embroidery base (17) on an embroidery machine during an embroidering process, characterized in that the embroidery base (17) has several positions in the X and Y directions by embroidering The holding member (19) in the correct position above and / or below the area is temporarily and firmly held. The method according to claim 1, wherein the holding member (19) temporarily penetrates the embroidery base (17), or holds the embroidery base (17) in a fixed position by an adhesive or sliding friction. The method according to claim 1 or 2, wherein the embroidery base (17) is pivoted outward along with the holding member (19) in a Z direction perpendicular to the embroidery base (17). An apparatus for implementing the method according to claim 1, comprising an embroidery machine having a grille (9) and a grille support arranged in the grille (9) (11) for tensioning and fixing an embroidery base (17), wherein a holding member (19) is pivotably or extendably arranged on the grill support (11), wherein the embroidery The base (17) is fixed relative to the grille (9) during embroidery. The device according to claim 4, wherein the holding member (19) is designed to be movable toward and away from the embroidery base (17). The device according to claim 5, wherein the holding member (19) is pivotably hinged on the grill support (11). The device according to any one of claims 4 to 6, wherein in order to contact the embroidery base (17), a contact element is formed on the holding member (19). The device according to claim 7, wherein the embroidery needle (41), Velcro or foam pad or a stamp having a high coefficient of friction on the surface is used as the contact element. The device according to any one of claims 4 to 8, wherein the positioning of the holding member (19) in the Z direction is achieved by a linear driving device (35). The device according to any one of claims 4 to 9, wherein the holding member (19) is pivotably hinged on the grill support (11).