JPH01111059A - Embroidering material tensioning apparatus of embroidering machine - Google Patents

Abstract

PURPOSE: To obtain the subject device capable of stretching an embroidery material belt on the web of a stretching frame, pressing the stretched embroidery material belt with a saddle-like stretching article from the upper side, inserting an air pressure- expandable article to fix an embroidery surface, embroidering the embroidery material belt, purging the pressure air and subsequently replacing the embroidered belt by the next embroidery material belt without using a special force and a special time. CONSTITUTION: Embroidery operations using the embroidery material-stretching device of the embroidery machine are carried out as follows: stretching embroidery material belts 24, 25 on a stretching frame 4 having a web 5, pressing the T-shaped cross section web 5 with a stretching article 6 having a U-shaped cross section, expanding rubber pipes 12, 13 by an air-pressing operation to fix the belt-like materials 24, 25 to both the ends of an embroidery surface, subjecting the fixed belt-like materials to an embroidery process, purging air from the rubber pipes 12, 13 after the embroidery operation is finished, lifting the stretching article 6 from the web 5, and then replacing the embroidered materials by the next materials. Thereby, the embroidery operations can be carried out in a short time without requiring a specific force for stretching and detaching the embroidery materials.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The invention relates to a tensioning device for embroidery material according to the preamble of claim 1.

[Prior art]

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

The rail leading to the frame of this known pasting device has a chevron-shaped cross-section with one protrusion, which is connected to the operating device of the embroidery machine and is covered with soft rubber. There is one intermediate space between the soft rubber and the limb of the rail facing this rubber, and in this space the embroidery material is held in the middle, and one tightening rod is provided, the length of which is pasted to the frame. A flat rod extending over the entire length is made oblique as a pulling object, so that it can be pivoted from the outside to the inside and from the inside to the outside, and in this way the embroidery material can be moved between the chevron-shaped sections facing it. Pressing or loosening the inner surface and rubber guide. The limb of the chevron cross-section facing the soft rubber has a ridge or protrusion extending over the length of the tension, behind which the flat rod is hooked when inserted into the intermediate space. It's stopped. The flat rod is thus anchored in its sticking position.

Insert the flat rod through the narrow space behind the bump and pull it out with the a! Not only does an extra force have to be applied over that required for rubbing, but there is a risk that the embroidery material is damaged in the process. Flat rods are very difficult to handle due to their long length.

The frame tensioning device known from Swiss Patent No. 299,339 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 One has handles on the sides and allows the material to be pasted to be inserted between them into a groove in the first frame part, which groove extends around the periphery of the frame. It is located along. 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 placed at the rear of the direction of insertion. It has one thick cross-section only in the area located at , which cross-section 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 bulging body, and the frictional effect essentially depends on the elastic force of the grooved tongues.

The two embodiments are applicable only when a solid frame member can be fixed to at least two opposite sides of the vantograph device being driven. 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.

[Problem to be solved by the invention]

The invention is defined in the preamble of claim 1, in which the embroidery material is formed in such a way that no special force is required for applying and removing the material, time can be saved and damage to the material is reliably avoided. An object of the present invention is to provide a pasting device.

[Means to solve problems]

The above object is solved according to the invention by the features of claim 1.

[Action and effect]

From Japanese Patent Publication No. 54-23633, a tensioning device is known which has an inflatable object, which is not used to tighten the material as is the object of the present invention. The applicator consists of a slitted outer ring, a closed circular inner ring and a tube which is formed as an open ring and is blown with compressed air. These parts, which are attached in the order from inside to outside: inner ring, outer ring, tube, can be inserted into a recessed part in one carrier plate once the tube has been deflated. The outer ring, which has been slit by inflating the tube with air, is pressed against the inner ring in order to ensure that the embroidery material is pulled by the tube, which is supported on the wall of the recessed part of the carrier plate. The embroidery material is then only clamped directly by the tube.

The first case in which this pasting device can function is that the inner and outer rings and tubes are inserted into the recessed part of the carrier plate, and the device is a pantograph operated by a program in the case of automatic embroidery machines. However, since the weight is large, the embroidery speed is unavoidably slow.

By forming a device having the structure of claim 1, one or several pulling objects can easily be placed on the web in the lower part of the frame together with the embroidery material located underneath, beside the unpressurized inflatable object. It is possible to be placed on Reliable expansion of the embroidery material is done quickly and softly by filling it with an inflatable object. Furthermore, the possibility of adapting the expanding force to various materials exists by manipulating the pressure of the medium filling the inflatable object.

The configuration described in Embodiment 1 below allows the inflatable object to be placed so as to be protected from external influences.

According to the possibilities described in embodiment section 2 below, the embroidery material is placed in the usual way on two opposite sides of the lower part of the frame by two pulling objects, for example an outer inflatable object than an inner inflatable object. A high pressure is applied, whereby a tilting or rotation of the pulling object is achieved and the embroidery material is additionally tensioned.

Embodiment No. 3.4.5, in which advantageous variants of the invention are shown below.
Subject to Section 6.7.

〔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 pedestal 2 of the embroidery machine, which is indicated by two embroidery heads 3 having a large number of needles in FIG. 4, for example, West German Patent No. 3
217962, the embroidery i! Corresponding to item ii, it is possible to move the embroidery head 3, which has a large number of needles, in mutually perpendicular directions. The tensioning frame 4 faces each other in this embodiment and has on its side facing towards the embroidery surface one T-shaped web 5 onto which one or several tensioning objects 6 are pasted with the embroidery material. It is now possible to place it in the shape of a drum in order to Since all the pulling bodies 6 are of equal design, only the structure of one pulling body is described. Each pulling body 6 includes a strap 7 which is open downwardly and has an approximately U-shaped profile, which contour extends inwardly at each of the lateral limbs 8°9. Retaining web 10.
It has 11. In the interior space of the iron band 7 there are arranged two inflatable bodies in the form of rubber tubes 12, 13 arranged at a distance from each other, which bodies are vulcanized together in the central part 14 and 1 It is fixed to the band iron 7 by two fastening strips 15. The tightening strip 15 has a curved surface 16, which surface 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, to the embroidery material of this presser foot. The end 1.8 on which it is placed is bent. Each rubber tube 12, 13 can be inflated independently of one another via one tube nipple. At the two ends of the limb 8.9 a web 10.11 of the band iron 7 is milled and thus a flat appendage 21.22
is formed.

A butt for the limb 8 of the band iron 7 provided in the tensioning frame 4 to limit the tilting movement of the pulling object 6 on the web 5, which is carried out by inflating the rubber tubes 12, 13 to different pressures. 23 is useful.

The embroidery material, which in the illustrated example consists of two pieces of Ji 324.25, is drawn from the material 27.28, which is supported on one pedestal 26, and is manipulated in the direction of arrows 30 and 31, for example by means of compressed air. 1 arranged on a rotating arm 32 shaped like a telescope tube.
under the two so-called slack-removal rollers 29 and on the deck l.
The sheet passes over the direction changing roller 33 supported on the side edge of the sheet and is supplied to the pasting frame 4.

Four unidirectionally operating compressed air cylinders 34 serve to lift the pulling object 6 which rests on the web 5 of the tensioning frame 4 for tensioning the embroidery material;
These cylinders are arranged at the four corners of the tensioning frame 4 and their piston rods 35 are attached to the appendages 2 of the band iron 7.
I'm getting 1.22.

After the embroidered part of the embroidery material has been removed from the tensioning frame 4, it is cut by a cutting device 36 whose cutting head 37 is connected to two guide rods 40. by means of a chain 39 driven by a motor 38. It is possible to slide on 41. A container 42 is provided to receive the cut pieces of embroidery material.

The operation of introducing air into the rubber tube 12,13 is carried out by two electromagnetically operated two-position three-way valves 43 and 44, which can be operated by a switch. valve 43
The pressure connection P of the valve 44 is connected via a line 45 to a monitoring unit 46 , which pressure connection end of the valve 44 is also connected via a line 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 via a conduit 52 and a conduit nipple 20 to a rubber It is connected to the pipe 13. 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 to a conduit 5
5 and is connected to the rubber tube 12 of the pulling object 6 via a conduit nipple 19.

A compressed air operating device as described above is provided for the rubber tubes 12, 13 of each pulling object 6.

An electromagnetically actuated two-position, three-way valve 56 is used for operating the compressed air cylinder 34, the compressed air connection end P of which is connected via a conduit 57 to the monitoring unit 7).
The working end A of this valve is then connected to the end of the compressed air cylinder 34 by a conduit. 6th
Only one compressed air cylinder 34 is shown in the figure in order to illustrate the principle of operation. The connections of the other three compressed air cylinders 34 are connected to conduit 5 as before.

The operation of the present invention will now be described.

When the sewing machine is stopped, the rubber tubes 12, 13 are deflated and the pulling object 6 is lifted off the T-shaped web 5 of the tensioning frame 4.

The pulling object 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 strip of material 24, 25 to be embroidered is determined by the corresponding operation of the slackening roller 29, arrows 30, 31.
, and pulled by the operator onto the tensioning frame 4 with the web 5. The pulling object 6 on the right in FIGS. 1 and 2 is then pressed onto the strip of material 24.25 and onto the web 5 in a fork-like manner, so that the hold-down fitting 17 is pressed, in particular in FIGS. As shown in the figure, 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 P of the valve is connected to the working connection A.

Compressed air flowing from pressure source 49 through conduit 48 and monitoring unit 46 is now connected to conduits 45 and 47, contact end P
and A, conduit 50.53, pressure regulator (ν1 valve 51.54,
Conduit nipple 1 of conduit 52.55 and rubber tube 12.13
Flows through 9.20. 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, arrow 30.31. Then, the pulling object 6 on the left side in FIGS.
is pressed onto the material strip 24.25 towards the embroidery surface and onto the web 5, and this left-hand pulling object is inflated in the same way as the tube 12.13 of the right-hand pulling object 6, with the material strip 24 .25 is pasted on both ends of the embroidery surface. If necessary, it is also possible to insert further tensioning objects 6 on the longitudinal edges of the tensioning frame 4 for tensioning the embroidery material.

In general, it is sufficient to inflate each of the two rubber tubes 12, 13 of the tensioning body 6 with equal air pressure in order to tension the embroidery material 24, 25 in the embroidery plane and apply a sufficient tensioning force. Since the rubber tubes 12 and 13 can be inflated independently of each other via the pressure regulating valve, it is possible to inflate the tube located on the side opposite to the embroidered surface of the object 6 to be pulled each time with a higher pressure than the other tubes. can. In this case, each pulling body 6 carries out a tilting movement or a rotational movement, with the clamping strip 1
The curved surface 16 of 5 rolls on the web 5. By such a tilting or rotational movement, which is limited by the abutments 23 of the tensioning frame 4, the applied embroidery material is additionally tensioned in the area of the embroidery surface, and the presser foot 17 is able to remove the embroidery material at its edge. 24.25 onto the deck l and the material is thus fixed for the next embroidery process.

At the end of the embroidery process, the valves 43, 44 are switched off and the rubber tube 12, 13 of the pulling object 6 is connected to the valves 43, 44.
The air is evacuated via the evacuating connection end R and the pulling object 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 pulled 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.

2. A tensioning device for embroidery material according to claim 1, characterized in that: (1) the tensioning object (6) has an essentially U-shaped cross section in order to accommodate the inflating object (12.13);

2. A tensioning device for embroidery material according to claim 1, characterized in that the inflatable objects 12, 13 are capable of being inflated with different pressures independently of one another.

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

(4) The tensioning device for embroidery material according to item 3, characterized in that the pulling object 6 has a curved surface 16 capable of rolling on the web 5.

(5) Several pulling objects 6 can be placed on the lower part 4 of the frame in order to tension the embroidery material from all directions.
The tensioning device for embroidery material according to any one of Items 1 to 4.

(6) The tension for embroidery material according to the above item 4 or 5, characterized in that each of the pulling objects 6 is provided with one presser metal fitting 17, 18 on the side edge facing the embroidery surface. Device.

(7) The lower part 4 of the frame is provided with an abutment 23 for restricting the tilting movement of the object 6 to be pulled. The tensioning device for embroidery materials described in .

[Brief explanation of the drawing]

Figure 1 is a schematic front view of one embroidery NIA 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 inflatable object. The second object to be pulled with the air removed is shown in Figure ■-
■Figure 4, an enlarged cross-sectional view cut along the line, is similar to Figure 3, but shows the inflatable object being inflated with different pressures; Figure 5 is 2 is a sectional view taken along the line v-■, and FIG. 6 is a compressed air connection diagram. 4... Attaching frame 5... Web 6... Object to be pulled 12.13... Inflating object 16... Curved surface 17.18... Holding metal fitting 23... Abutment

Claims (1)

[Claims] (1) It has a tensioning frame that can move relative to the embroidery needle depending on the embroidery subject, and the tensioning frame has a lower part and a pulling object that cooperates with the lower part. In the tensioning device for embroidery material of an embroidery machine, the tensioning object (6) comprises two inflatable objects (12, 13) arranged at a distance from each other and the lower part of the frame (4) has one web (5) on which these inflatable objects are arranged, this web has inflatable objects (12,
13) An embroidery material tensioning device for an embroidery machine, characterized in that it is used as a means for supporting the embroidery material.