JPH076128B2 - Device for holding and guiding materials on embroidery machines - Google Patents

Abstract

The invention relates to an apparatus for holding and guiding a material web on embroidering machines with a pantograph-guided stretching frame. The material web is first stretched over the stretching frame. The material web is then clamped in the stretching frame and thereby further clamped, and finally the material web is slackened on both sides of the stretching frame to form loops. <IMAGE>

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for holding and guiding a band-shaped material or a material-cutting piece on an embroidery machine, which is provided with a pantograph-guided tension frame, and the tension frame serves as an outer frame. , An inner frame and a tension tube that can be clamped between the outer frame and the inner frame, the tension tube being connectable to a pressure medium source.

[0002]

2. Description of the Related Art In an embroidery machine having a pantograph-guided tensioning frame, a portion of a band-shaped material to be embroidered is tensioned on the tensioning frame and can be moved together with the tensioning frame.

An apparatus in which an inflatable tube is used for the purpose of tensioning a band material on a tension frame is known (PC
T-WO89 / 10443). Due to the special carcass formation and the introduction of the strength support, the tube expands its peripheral surface when air is supplied, and moves the embroidery part of the strip-shaped material (where the tube is placed on this part) outward. Is configured to let. Due to its bearing type, the tube expands outwardly, which increases the tension of the strip.

In addition, German Federal Patent 3733
The inflatable bellows tube known from U.S. Pat. No. 886 is fixed to a specially designed molding which is mounted from above on a correspondingly complex molding. A band-shaped material is stretched.

[0005]

SUMMARY OF THE INVENTION The object of the invention is to improve a device of the type mentioned at the outset such that the embroidered part of the strip or material fragment is tensioned smoothly on all sides and the material tension is increased. The object is to provide such a device in which the force is adjustable and thus reproducibly set. This is
It is desirable to be able to do this both inside the embroidery machine and outside the embroidery machine, i.e. in a separate work space.

[0006]

In order to solve this problem, in the structure of the present invention, the outer frame is arranged on the inner peripheral surface thereof and / or the inner frame is arranged on the outer peripheral surface thereof to accommodate the tension tube. The tension tube has a groove and the tension tube has a shut-off mechanism or pressure accumulator and a removable connection to the pressure medium source so that the tension frame connection to the pantograph guide is releasable.

[0007]

According to the present invention, the tension frame is an independent and unique unit. The unit can be removed from the embroidery machine and the material to be embroidered can be placed outside the embroidery machine. Due to the provision of the shut-off mechanism, the tension tube need not always be connected to the pressure medium supply, in particular the pressure air supply. It is also possible to apply the pressure medium to the tension tube in several steps, whereby a post-correction of the position of the material arranged between the inner and outer frames and the pretensioning force can be carried out. Naturally, the required pressure in the tension tube can be adjusted in relation to the respective requirements. Advantageously, the shut-off mechanism comprises a check valve. The removable connection to the pressure medium source may be a bayonet coupling.

In large tension frames, for example trim frames, the tension tube may consist of several sections.
Since each of these sections has a shut-off mechanism and a detachable connection to a source of pressure medium, the tensioned tube sections which can be individually filled with pressure medium are subdivided into sections of material to be embroidered. It can also be used for adjusting the tensioned distance.

In order to avoid the troublesome realignment work between the outer frame and the inner frame at the time of tensioning, the grooves provided in the outer frame and the inner frame have a symmetrical balance between the frames. It is desirable to have a cross section that aids in self-centering. This is possible by using a configuration in which the cross section of the groove is formed symmetrically with respect to the frame center plane.

In order to obtain self-centering of the frame and at the same time to increase the tensioning force, the inner frame has a holding thin plate for loading the upper surface of the outer frame or is provided on the inner frame. Advantageously, the molded upper surface is drawn outwards until it covers the upper surface of the outer frame, and the grooves provided in the outer frame and / or the inner frame are formed asymmetrically with respect to the frame center plane. is there. The asymmetry creates an additional force component. That is, the additional force component causes the outer frame to be pressed against the pressing thin plate acting as a receiver or the upper surface of the inner frame pulled out, and in this case, centered. Another advantage of the structure in which the outer frame is pressed against the upper surface of the inner frame or the pressing thin plate fixed to this upper surface based on the asymmetry is recognized as follows. That is, the material to be stretched is also clamped between the inner frame and the outer frame or between the outer frame and the pressing thin plate, and therefore, when the material is tensioned later by the pressure supply to the tension tube, the material is placed in the groove of the outer frame. Afterwards, it is no longer post-pulled from above, i.e. the tension tube which has expanded into the groove of the outer frame can only pull material from the lower material range to be tensioned.

In a further advantageous configuration of the invention, a changer is arranged above the tensioning frame, the changer having a grip element movable in the vertical direction, the grip element being provided inside. Can be coupled to the frame. This exchange device serves to insert the inner frame into the outer frame or remove the inner frame from the outer frame with the embroidered portion of the band-shaped material interposed. This allows the embroidery machine to operate automatically.

In particular, the grip element may be designed as a swivelable hook. This hook is adapted to engage with a corresponding notch provided in the inner frame. The grip element may be pivotable against the spring force by means of a stroke magnet.

In order to enable a satisfactory centering between the inner and outer frames, the changer can have locating pins and the inner frame can have corresponding notches.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings.

The embroidery machine 1 partly shown in FIG. 1 comprises a work surface 2 through which the material 3 to be embroidered is guided. This material is stretched on the tension frame 4. The tension frame is moved by the pantograph guide 17.

2 and 3, a tensioning frame 4 consisting of an inner frame 5 and an outer frame 10 is shown together with a material 3 and a pressure supply conduit 16. Since the inner diameter of the outer frame 10 is set larger than the outer diameter of the inner frame 5, there is a play 19 between the two frames. This play 19 is filled by the tension tube 15. The tension tube 15 has a circular or elliptical cross section and is thin and elastic.
This tension tube 15 is provided with a groove 6 provided on the peripheral surface of the inner frame 5.
It is fixed to. The inner peripheral surface of the outer frame 10 also has a groove 11, which is formed in a triangular cross section.
The tension tube 15 may be fixed to the outer frame 10.

The tension tube 15 is connected to a positive pressure / negative pressure source via a pressure supply conduit 16. Thereby, the tension tube 15 is supplied with pressurized air or exhausted. The inner frame 5 is lowered into the outer frame 10 located below the material 3. The material 3 smoothly placed on the outer frame 10 is pretensioned by the lowering operation of the inner frame via the inner edge portion 14 on the upper side of the outer frame 10 and the outer edge portion 8 on the lower side of the inner frame 5. And in this case the material is pretensioned in all directions. Subsequently, pressurized air is supplied to the tensioned tube 15 which is contracted by applying a vacuum. This tension tube 15 is crimped into the groove 11 of the outer frame 10 and thus clamps the material 3 onto the tension frame 4. A vacuum is applied to the tension tube 15 to remove the embroidered material 3. The tension tube 15 contracts, and the groove 11 provided in the outer frame 10 is opened. Since the inner frame 5 can be lifted from the outer frame 10, the material 3 is exposed for removal purposes.

As shown in FIG. 4, when the cross section of the inner frame 5 is asymmetrical and the lower surface 7 of the inner frame 5 extends beyond the upper surface 13 of the outer frame 10 to the outside, When the tension tube 15 is filled with pressurized air, the outer frame 10 is pushed upward, and the upper surface 13 of this outer frame holds the material 3 and the outer frame 1
It is fastened and fixed to the lower surface 7 of the cross section of the inner frame 5 overlapping 0. As the tension tube 15 further expands into the groove 11 of the outer frame 10 when the pressure rises, the amount of material 3 required as a result of the tube expansion is post-pulled from below, and thus the desired tension of the material to be embroidered in the tension frame 4. Will increase. Of course, again in this case the removal of the embroidered material from the tensioning frame is carried out as described above.

In the embodiment shown in FIG. 5, the inner frame 5 has a holding thin plate 9 for loading the upper surface 13 of the outer frame 10,
The cross section of the groove 11 provided in the outer frame 10 is asymmetric with respect to the center plane of the tension frame 4. To this end, an assembly 12 is provided at the upper corner of the groove 11. This assembly consists of a shaped body with a triangular cross section. The integrated body 12 may be integrally formed with the molded body forming the groove. Due to the asymmetrical cross section of the groove 11, an additional force component in the vertical direction is formed when inflating the tension tube 15, which force component is the outer frame 10.
The upper surface 13 of the above is pressed against the pressing thin plate 9 serving as a receiving member.

In the embodiment shown in FIG. 6, the pressing thin plate 9
However, the upper surface 13 of the outer frame 10 is completely covered, and the bent portion 18 surrounds the upper surface 13. When pressure is applied to the tension tube 15, this tension tube expands into the groove 11 provided in the outer frame 10 or the inner frame 5 to produce the desired tension of the material 3 and, on the other hand, the increased pressure. In, there is a possibility that the inner frame 5 or the outer frame 10 may be deformed and the play 19 may become unacceptably large. Since the outer frame 10 is surrounded by the bent portions 18 of the pressing thin plate 9, such deformation is effectively prevented. The use of such means is particularly advantageous in large frames, such as trim frames.

Although not shown in the drawings, the tension tube 1
5 has a tension tube 15 to which the check valve belongs, and a removable connection, in particular a bayonet coupling for a pressure source (not shown). With such an arrangement, it is possible to take out the tension frame 4 as an independent component from the embroidery machine and to stretch the material to be embroidered at another work location. Also not shown,
The tension tube 15 may be composed of multiple sections.
In this case, these sections each have a shut-off mechanism and a removable connection to the source of pressurized air. Such an arrangement is particularly advantageous for very large upholstery frames, for example trim frames.

An embroidery head 103 of the embroidery machine is arranged above the work surface 101 (see FIG. 7) on which the strip-shaped material 102 to be embroidered is guided. Work surface 10
Between the 1 and the material 102, the outer frame 104 is movable by means of a pantograph drive 105. Work surface 101
And the material 102 above the exchanging device 10 at a distance.
6 is fixed. This exchanging device is located above a predetermined range of the work surface 101, and the material 102 is stretched on the tension frame 107 above this range. This range includes the size and shape of the tension frame 107 and the material 102.
Can be freely set in relation to the pattern, the embroidery machine and the like. The exchange device 106 includes a grip device 108 that can reciprocate, a base frame 109 that is immovably arranged,
It consists of a drive, for example a working cylinder or a motor. The grip device 108 is provided with a guide element 111 on the upper portion thereof, and the guide element is vertically guided by the base frame 109. At least three hook-shaped grip elements 112 are arranged in the lower part of the grip device 108, and these grip elements are held in the illustrated position against a compression spring 119 (see FIG. 8), It can be swung outward by the rod 120 of the stroke magnet 121. A positioning pin 113 facing downward is provided near each grip element 112. The grip element 1
By using 12, the inner frame 114 of the tension frame 107 can be accommodated. The inner frame 114 and the outer frame 104 are fitted to each other in terms of their shape and dimensions. The inner frame and the outer frame are formed in a circular shape, a quadrangular shape, or a polygonal shape.

Since the inner diameter of the outer frame 104 is formed larger than the outer diameter of the inner frame 114, a play exists between the outer frame and the inner frame. The tension tube 115 has a circular or elliptical cross section, and is thin and elastic. The tension tube is fixed to a groove 116 provided on the peripheral surface of the inner frame 114. The inner peripheral surface of the outer frame 104 also has a groove 117, and this groove is formed in a circular shape or a triangular shape.

The tension tube 115 is connected to a positive pressure / negative pressure source via a pressure supply conduit. As a result, whether compressed air is supplied to the tension tube 115,
Or exhausted.

The inner frame 114 has a notch 122 for the grip element 112 and a notch 1 for the positioning pin 113 for the purpose of coupling with the grip device 108.
23 and a holding angle 124, to which the grip element 112 engages from behind.

A clamp device 128 is arranged between the take-up roller 125 or the pay-out roller 126 and the deflecting roller 127 positioned in front of and behind the work surface 101. The clamp device 128 includes a roller 13 that is freely movable by a lever arm 129 that is pivotally mounted.
0 and a trough-shaped pressing member 132 which is also attached to the lever arm 131. In this case, the lever arm 129 is pivotally mounted so as to be pivotable.

The roller 130 is pulled downward by the spring 133 to stretch the strip-shaped material 102 with equal tension on the feeding side and the winding side. The pressing member 1
A working cylinder 134 is fixed to the lever arm 131 of 32. This working cylinder either fixes the pressing member 132 below the roller 130 at intervals or presses the pressing member 132 against the roller 130 against the spring force of the spring 133 during the stroke movement, thus pressing the material 102. Clamp tightly. As the piston rod of the working cylinder 134 carries out a further upward movement, the rollers are swiveled up together. When the spring force of the spring 133 is overcome, the pressing force between the roller 130 and the pressing member 132 increases, and at the same time, the clamp portions of both rollers 130 and the strip-shaped material 102 are loosely wound. A material loop is formed between the facing roller 127. In this state, the material 102 is relaxed on the work surface 101 and is free to move the tension frame 107.

Before the start of embroidery, the band-shaped material 102 is stretched on the tension frame 107. At this point, the inner frame 114 is suspended above the material 102 by the grip element 112 of the changer 106. The outer frame 104 is located at the storage position below the exchange device 106. Both pressing members 132 and both rollers 130 are located at the lower end positions. That is, the strip-shaped material 102 is stretched on the work surface 101, but the roller 130 and the pressing member 132 are stretched.
Not clamped between.

The drive 110 is then controlled to lower the exchanging device 106 with the inner frame 114 suspended by the exchanging device to the outer frame 114 located below the material 102. By this lowering operation, the strip-shaped material 102 already stretched on the work surface 101 by the lowered roller 130 is further moved in all directions via the inner edge portion of the outer frame 104 and the outer edge portion of the inner frame 114. It is tensioned and, in this case, tensioned in all directions. Subsequently, pressurized air is supplied to the tensioned tube 115 that is contracted by applying a vacuum. The tension tube is pressed into a groove 117 with a rough surface, thus clamping the band-shaped material 102 to the tension frame 107. Continuing, the exchange device 10
The grip element 112 releases the holding angle 124, since the grip element 112 is pivoted outwards, as 6 is moved further down a few mm. Then, the exchange device 106 moves upward again. After that, both pressing members 132 are also moved upwards towards the rollers 130, which causes the strip-shaped material 102.
Is clamped on both sides.

When the pressing member 132 continues to move upward, the strip-shaped material 102 on the work surface 101 is relaxed, and the tension frame 107 is used with the pantograph driving device 105 together with the embroidered portion. 101
You can move freely along. Then, the tension frame 107
The robot is moved below the embroidery head 103 for the purpose of embroidering according to the entered program. In this case, each clamping device 128 and the deflection roller 1 to which it is assigned
The material loop formed with 27 must correspond to the maximum travel of tension frame 107.

When the pattern is embroidered, the tension frame 107 again moves to the starting position below the exchanging device 106. The clamping device 128 moves to the lower end position again, tensions the strip-shaped material 102 on the work surface 101, and the pressing member 132 releases the roller 130. The exchange device 106 also descends so that the grip element 112 can enter the notch 122 and the locating pin 113 can enter the notch 123. The grip element 112 locks onto the holding angle 124. A vacuum is applied to the tension tube 115, causing the tension tube to contract and release the groove 117. After that, the exchanging device 106 is moved upward together with the inner frame 114 suspended by the exchanging device, and the take-up roller 125 further conveys the material 102 until the next place to be embroidered is located in the storage range. To do.

[Brief description of drawings]

FIG. 1 is a side view of an embroidery machine.

FIG. 2 is a cross-sectional view showing a range A of the tension frame shown in FIG. 1 in a state where the tension tube is contracted.

FIG. 3 is a cross-sectional view showing a range A of the tension frame shown in FIG. 1 in a state where the tension tube is inflated.

FIG. 4 is a sectional view showing a range A of a tension frame according to another embodiment in a state where the tension tube is expanded.

FIG. 5 is a cross-sectional view showing a range A of a tension frame according to still another embodiment with a tension tube expanded.

FIG. 6 is a sectional view showing a range A of a tension frame according to still another embodiment in a state where the tension tube is expanded.

FIG. 7 is a side view of another embroidery machine.

8 is a cross-sectional view of the tension frame of the embroidery machine shown in FIG.

[Explanation of symbols]

1 Embroidery machine, 2 work surface, 3 material, 4 tension frame, 5 inner frame, 6 groove, 7 lower surface, 8 outer edge part, 9 holding thin plate, 10 outer frame, 11 groove, 1
2 built-in body, 13 upper surface, 14 inner edge portion, 1
5 tension tube, 16 pressure supply conduit, 17 pantograph guide, 18 folding part, 19 play, 101 working surface, 102 material, 103 embroidery head, 104 outer frame, 105 pantograph drive device, 106 exchanging device, 107 tension frame,
108 grip device, 109 base frame,
110 driving device, 111 guide element, 1
12 grip elements, 113 positioning pins,
114 inner frame, 115 tension tube, 116,
117 grooves, 119 compression springs, 120 rods,
121 stroke magnets, 122, 123 notches, 1
24 holding angle, 125 winding roller, 1
26 feeding roller, 127 deflecting roller, 12
8 Clamping Device, 129 Lever Arm, 130 Roller, 131 Lever Arm, 132 Pressing Member, 13
3 springs, 134 working cylinders, 136 material loops

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Karl-Peter Melder Federal Republic of Germany Gonbach Hohenstraße 4 (72) Inventor Wolfgang Reiner Berlin Germany Mendelssohn Strasse 1 (72) Inventor Holstribecke Federal Republic of Germany Berlin Platz Dare Fair Eichten Natione 2

Claims (12)

[Claims] 1. A device for holding and guiding a band-shaped material or a material-cutting piece on an embroidery machine, comprising a pantograph-guided tension frame, the tension frame including an outer frame, an inner frame, and An outer frame (10) is provided on the inner peripheral surface of the inner frame with a tension tube that can be clamped between the outer frame and the inner frame and is connectable to a pressure medium source. , And / or the inner frame (5) is provided on its outer peripheral surface,
Each has a groove (6, 11) for accommodating the tension tube (15), said tension tube (15)
Has a shut-off mechanism or pressure accumulator and a removable connection to the pressure medium source, the connection of the tension frame (4) to the pantograph guide (17) being releasable, the embroidery machine A device that holds and guides the material. 2. The device of claim 1, wherein the shutoff mechanism comprises a check valve. 3. The removable connection to the pressure medium source is embodied as a bayonet coupling.
Or the apparatus according to 2. 4. The tension tube (15) comprises a plurality of sections, each section having a shut-off mechanism and a removable connection for a pressure medium source. The apparatus according to claim 1. 5. The grooves (6, 11) provided in the outer frame (10) and the inner frame (5) have a cross-section that assists in symmetrical balancing and self-centering of the frame. A device according to any one of claims 1 to 4. 6. The cross sections of the grooves (6, 11) are formed symmetrically with respect to the frame center plane.
The apparatus according to claim 1. 7. The inner frame (5) is a top surface (1) of the outer frame (10).
3) has a pressing thin plate (9), and the cross section of the groove (6, 11) provided in the outer frame (10) and / or the inner frame (5) is asymmetric with respect to the center plane of the frame. 7. A device as claimed in any one of the preceding claims, which is embodied. 8. The holding thin plate (9) is an outer frame (10).
The upper surface (13) is surrounded by a bent portion (18), and the pressing thin plate presses the inner frame (5) with the outer frame (10) when pressure is applied to the tension tube (15). Device according to any one of claims 1 to 7. 9. The exchange device (1) above the tension frame (107).
06) is arranged and the exchange device has a grip element (112) movable in the vertical direction,
9. Device according to any one of the preceding claims, wherein the grip element is couplable with the inner frame (114). 10. The grip element (112).
Are configured as swivel hooks, which hooks correspond to the notches (12) provided in the inner frame (114).
Device according to any one of claims 1 to 9, adapted to engage 2). 11. Device according to claim 1, wherein the grip element (112) is pivotable against spring force by means of a stroke magnet (121). 12. The method according to claim 1, wherein the exchange device (106) has a locating pin (113) and the inner frame (114) has a corresponding notch (123). The apparatus according to claim 1.