JPH0238711B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has one pasting frame that can move relative to the embroidery needle according to the embroidery theme, and this pasting frame has one The present invention relates to a tensioning device for embroidery material of an embroidery machine, which comprises a lower part and a clamping body cooperating with this lower part.

[Prior art]

A device of this type for stretching embroidery material onto a frame is known from DE 190 7 177 A1.

The rail guiding the frame of this known pasting device has a chevron-shaped cross-section with a recess which is connected to the operating device of the embroidery machine and is covered with soft rubber. There is an intermediate space between the soft rubber and the limb of the rail facing the elastic, and in this space the embroidery material is sandwiched in between, and a length is provided with a tightening rod to be attached to the frame. A flat rod extending over the entire length of the rod is made oblique as a tensile object so that it can be pivoted from outside to inside and from inside to outside, and in this way the embroidery material can be oriented facing it. The inner surface of the chevron-shaped cross section and the rubber guide are pressed or loosened. The limb of the chevron-shaped cross-section facing the soft rubber has a ridge or protrusion extending over the length of the tension, behind which the flat rod is drawn when inserted into the intermediate space. It's hung and stuck. The flat rod is thus fixed in its attachment position. Inserting the flat rod through a narrow space and behind the bump and pulling it out not only requires extra force to be applied over and above that required to apply friction while taut. There is a risk that the embroidery material will be damaged in this case. Flat rods are very difficult to handle due to their long length.

The frame tensioning device known from Swiss Patent No. 299339 consists of two frame parts completely separated from each other, one of these frames is fixed to the pantograph device of the embroidery machine and the other 1
One has a handle on the side and the material to be pasted can be inserted between them into a groove in the first frame part, which groove runs along the periphery of the frame. It is set up. In order to avoid that the material is not clamped tightly, as long as the two parts of the frame are at least approximately fully inserted into each other, the parts that can be inserted into the grooved parts of the frame should be Only in the region located at the rear it has a thicker cross-sectional area, which cross-sectional area is equal to or larger than the internal dimension of the opening of the groove section. In one embodiment, the frame edges of the groove part and the other part inserted therein have a wedge-shaped cross-section, and in another embodiment the side walls of the groove part are formed by elastic tongues, This tongue has a groove running along its edge, in which groove one bulge grips the other in the case of parts that are inserted into each other.

In the case of wedge-jointed frame members, the frame parts with wedge-shaped frame edges must be subjected to a sufficiently large insertion force in order to obtain sufficient friction to prevent the wedge joint from loosening when the material is stretched between the frame members. must be inserted into the groove of the other frame part. The same amount of force must be applied when removing something that is attached. This also applies to frame parts with bulges and grooves. In this frame part, the elastic tongues are spread under a constant force by the bulge, and the frictional effect essentially depends on the elastic force of the grooved tongues.

The two embodiments provide at least two opposing orientations of the pantograph device in which the solid frame member is driven.
Applicable only when it is possible to be fixed on one side. This is because if only one side is fixed, dangerous bending forces will be exerted on the device fixing the lower part of the frame when the material is removed. Furthermore, one frame part must be inserted entirely into the other frame part, since the tensioning frame is formed in two parts. For example, such a structure is not suitable for attaching large materials to a frame for embroidering border decorations.

Japanese Patent Publication No. 54-23633 discloses a tensioning device having an inflatable body, which is used for firmly fixing materials such as the object of the present invention. It's not. The applicator consists of a slitted outer ring, a closed circular inner ring and a tube formed as an open ring and blown with compressed air.
These parts, which are attached in the order from the inside to the outside: inner ring, outer ring, tube, can be inserted into recesses in one carrier plate once the tube has been deflated. The outer ring, which is slitted by inflating the tube with air, is pressed against the inner ring in order to securely fix the embroidery material by means of the tube, which rests on the wall of the recessed part of the carrier plate. . The embroidery material is then only clamped directly by the tube. The prerequisite for this pasting device to work is that the inner and outer rings and tubes are inserted into the recessed part of the carrier plate, and the device is connected to a punt which is operated by a program in the case of automatic embroidery machines. However, due to the large mass, the embroidery speed is unavoidably slow.

[Problem to be solved by the invention]

The present invention is designed for embroidery materials in embroidery machines formed in such a way that no special force is required for pasting and unsticking the embroidery materials, time can be saved, and damage to the materials is reliably avoided. Our goal is to provide a tensioning device.

[Means to solve problems]

The present invention solves the above problem by having a pasting frame that is movable relative to the embroidery needle depending on the embroidery theme, and this pasting frame has a lower part and cooperates with this lower part. In a tensioning device for embroidery material of an embroidery machine, the tensioning device comprises
The clamping body comprises two inflatable bodies arranged at a distance from each other and capable of being inflated with different pressures independently of each other, and the lower part of the frame has a web arranged between the two inflatable bodies. The invention has been solved by a tensioning device for embroidery material of an embroidery machine, characterized in that the web is used as a means for supporting the expansion and contraction body, and the embroidery material is clamped between the web and the clamping body.

[Action and effect]

Thanks to the invention, one or several clamping bodies can simply be placed on the web of the lower part of the frame, together with the underlying embroidery material, beside the unpressurized inflation body. is possible. Reliably spreading the embroidery material is done quickly and softly by filling it with an inflatable body. Furthermore, there is the possibility of adapting the expanding force to various materials by manipulating the pressure of the medium filling the expansion and contraction body. By filling the outer expansion and contraction body with a higher pressure fluid than the inner expansion and contraction body of each of the two expansion and contraction bodies on the two opposite sides of the lower part of the frame, the tightening body Additional tension is applied to the embroidery material by tilting or rotating the embroidery material.

The configuration described in Embodiment 1, which will be shown later, allows the expansion and contraction body to be placed while being protected from external influences.

Advantageous variants of the invention are shown in embodiment sections 2 to 6.

〔Example〕

One embodiment of the invention is described in the following description with the aid of the accompanying drawings.

On the deck 1 of the stand 2 of the embroidery machine, which is indicated by the dot-dash line in FIG. Pasting frame 4
can be moved relative to the embroidery head 3 with a number of needles in mutually perpendicular directions, corresponding to the embroidery subject, by means of a conventional pantograph device, known for example from German Patent No. 3,217,962. ing. The tensioning frames 4 in this embodiment face each other and on their sides facing towards the embroidery surface have a T-shaped web 5 on which one or several clamping bodies 6 are placed to hold the embroidery material. It is now possible to place it in a saddle shape for pasting. Since all the clamping bodies 6 are of equal design, only the structure of one clamping body is described. Each clamping body 6 is open towards the bottom and includes a strap 7 having a generally U-shaped profile, which extends inwardly at the lateral limbs 8, 9, respectively. It has retaining webs 10, 11. In the interior space of the band iron 7 two inflatable bodies in the form of rubber tubes 12, 13 arranged at a distance from each other are arranged, which inflatable bodies are connected to the central part 14.
vulcanized together and one fastening strip 1
5 to the band iron 7. Tightening strip 1
5 has one curved surface 16, which can roll over the web 5. On the outside of the limb 9 of the band iron 7 facing the embroidery surface there is one end of a presser foot 17, which is fixed, for example by brazing or gluing, and the embroidery material of this presser foot is fixed. The end 18 that rests on is bent. Each rubber tube 12, 13 can be inflated independently of one another via one tube nipple. At the two ends of the limbs 8, 9, the webs 10, 11 of the band iron 7 are milled, so that flat projections 21, 22 are formed.

For the limb 8 of the band iron 7 provided in the tensioning frame 4 in order to limit the tilting movement of the clamping body 6 on the web 5, which is carried out by inflating the rubber tubes 12, 13 to different pressures. Butt 23 is helpful.

In the illustrated embodiment two layers 24, 25
The embroidery material consisting of is drawn from material rolls 27, 28 supported on one pedestal 26 and formed like a telescopic tube which is manipulated in the direction of arrows 30 and 31, for example by means of compressed air. It passes under a so-called slackening roller 29 which is arranged on a pivoting arm 32 and over a deflection roller 33 which is supported on the side edge of the deck 1 and is fed to the tensioning frame 4 .

Four unidirectionally operating compressed air cylinders 34 serve to lift the clamping body 6 which rests on the web 5 of the tensioning frame 4 for tensioning the embroidery material; The piston rods 35 grip the protrusions 21, 22 of the band iron 7.

After the embroidered part of the embroidery material has been removed from the tensioning frame 4, it is cut by a cutting device 36, the cutting head 37 of which is connected to the motor 3.
A chain 39 driven by 8 allows it to slide on two guide rods 40, 41. A container 42 is provided to receive the cut pieces of embroidery material.

The operation of introducing air into the rubber tubes 12, 13 is carried out by two electromagnetically operated two-position, three-way valves 43 and 44, which can be operated by a switch. The pressure connection P of the valve 43 is connected by a conduit 45 to a monitoring unit 46;
This monitoring unit 46 and the pressure connection P of the valve 44 are also connected by a conduit 47. The monitoring unit 46 is connected via a conduit 48 to a pressure source 49.

The operative connection end A of the valve 43 is connected via a conduit 50 to the input end of an adjustable pressure regulating valve 51, the output end of which is connected to a conduit 52.
and is connected to the rubber tube 13 by a conduit nipple 20. Similarly, the working connection end A of the valve 44 is connected by a conduit 53 to an adjustable pressure regulating valve 54 , whose output end is connected via a conduit 55 and a conduit nipple 19 to the clamping body 6 . rubber tube 1
It is combined with 2.

A compressed air operating device as described above is provided for each rubber tube 12, 13 of the clamping body 6.

One electromagnetically actuated two-position, three-way valve 56 is used to operate the compressed air cylinder 34;
The compressed air connection P of this valve is connected via a line 57 to the monitoring unit, and the working connection A of this valve is connected via a line 58 to the compressed air cylinder 3.
It is connected to the connection end of 4. Only one compressed air cylinder 34 is shown in FIG. 6 to illustrate the principle of operation. The other three compressed air cylinders 34 are connected to the conduit 58 as before.
It is connected to the.

The operation of the present invention will be explained below.

When the sewing machine is stopped, air is removed from the rubber tubes 12 and 13, and the clamping body 6 is attached to the T of the tensioning frame 4.
It is lifted from the glyph-shaped web 5. The clamping body 6 can be held above the tensioning frame 4 during the tensioning process, for example by means of a retaining magnet.

Then a certain length of the strips 24, 25 of material to be embroidered is determined by a corresponding operation of the slackening roller 29;
For example, by the movements shown by arrows 30, 31, the material 2
7, 28 and stretched by the operator onto the tensioning frame 4 with the web 5. Then the clamping body 6 on the right in FIGS.
In particular, as shown in FIGS. 3 and 4, the embroidery side is pressed down.

The two valves 43, 44 are then pushed in by actuating one switch, so that the compressed air connection end P of the valve is connected to the working connection end A.
Compressed air flowing from pressure source 49 through conduit 48 and monitoring unit 46 now flows through conduits 45 and 4
7, connection ends P and A, conduits 50, 53, pressure regulating valves 51, 54, conduits 52, 55 and rubber tube 12,
13 conduit nipples 19,20. The strips of material 24, 25 are thereby pressed against the web 5. The material is thus tensioned at one end and tensioned in the embroidery plane by a corresponding operation of the slackening roller 29, for example the movement shown by arrows 30, 31. The left-hand clamping body 6 in FIGS. 1 and 2, like the right-hand clamping body 6, is then pressed in advance onto the material strips 24, 25 and onto the web 5 with the presser foot 17 facing the embroidery surface. And this tensile object on the left is the tightening body 6 on the right.
The tubes 12, 13 are inflated in the same manner as the tubes 12, 13, the strips of material 24, 25 being stretched at both ends of the embroidered surface. If necessary, it is also possible to insert further clamping bodies 6 on the longitudinal edges of the tensioning frame 4 for applying the embroidery material.

In general, in order to tension the embroidery materials 24, 25 in the embroidery plane and to apply a sufficient tensioning force, two rubber tubes 12, 13, respectively, of the clamping body 6 are required.
It is sufficient to inflate them with equal air pressure.
Since the rubber tubes 12 and 13 can be inflated independently of each other via the pressure regulating valve, the tube located on the side opposite to the embroidery area of the clamping body 6 can be inflated with a higher pressure than the other tubes each time. Can be done. In this case, each clamping body 6 carries out a tilting or rotational movement, the curved surface 16 of the clamping strip 15 rolling over the web 5. By such a tilting or rotational movement, which is limited by the abutment 23 of the tensioning frame 4, the applied embroidery material is additionally tensioned in the area of the embroidery area and the presser foot 17 is forced to tighten its edge 18. Embroidery material 2
4, 25 onto the deck 1 and the material is thus fixed for the next embroidery process.

At the end of the embroidery process, the valves 43 and 44 are switched off, and the rubber tubes 12 and 13 of the clamping body 6 are connected to the valve 4.
The air is evacuated via the evacuating connection R of 3, 44, and the clamping body 6 is lifted off the web 5 of the tensioning frame 4.

To replace the embroidery surface, the process described above is started anew. After the newly embroidered length of the embroidery material 24, 25 has been brought onto the tensioning frame 4 in the area of the embroidery head, the embroidered area of the embroidery material 24, 25 is at right angles to the direction in which it is drawn out. It is cut off by the cutting head 37 of the cutting device 36, which moves in the same direction, and placed in the container 42.

Embodiments of the invention can be as follows.

1. A tensioning device for embroidery material according to claim 1, characterized in that the clamping body (6) has an essentially U-shaped cross section in order to accommodate the expansion and contraction bodies (12, 13).

(2) The embroidery material tensioning device according to claim 1 or 1, wherein the web 5 has a T-shaped cross section.

(3) The tensioning device for embroidery material according to item 2 above, wherein the expansion and contraction body 6 has a curved surface 16 that can roll on the web 5.

(4) In order to tension the embroidery material from all directions, several clamping bodies 6 can be placed on the lower part 4 of the frame. The tensioning device for embroidery material according to any one of Items 1 to 3.

(5) The embroidery material according to item 3 or 4, wherein each of the fastening bodies 6 is provided with one presser metal fitting 17, 18 on the side edge facing the embroidery area. tensioning device.

(6) The lower part 4 of the frame is provided with an abutment 23 for restricting the tilting movement of the clamping body 6. 2. The tensioning device for embroidery material according to item 1.

[Brief explanation of drawings]

Figure 1 is a schematic front view of an embroidery machine fed from a roll of embroidery material, Figure 2 is a simplified top view of the embroidery machine, and Figure 3 shows the frame and expansion body. Figure 4 is an enlarged cross-sectional view taken along the - line in Figure 2 with the air removed, and Figure 4 is a similar representation to Figure 3, but the expansion and contraction body is under different pressures. FIG. 5 is a sectional view taken along line V-V in FIG. 2, and FIG. 6 is a compressed air connection diagram. 4... pasting frame, 5... web, 6... stretching object, 12, 13... expanding object, 16...
Curved surface, 17, 18... Presser fitting, 23...
Butt.

Claims (1)

[Claims] 1. It has a pasting frame that can move relative to the embroidery needle depending on the embroidery theme, and this pasting frame cooperates with a lower part and this lower part. In the tensioning device for embroidery material of an embroidery machine, the tightening bodies 6 are arranged at a distance from each other and can be inflated with different pressures independently of each other.
and the lower part 4 of the frame has a web 5 arranged between the two inflatable bodies, which web serves as means for supporting the inflatable bodies 12, 13. characterized in that the embroidery material is clamped between the web 5 and the clamping body 6;
Stretching device for embroidery materials on embroidery machines.