DE3502886A1 - Device for multi-needle embroidering machines with a needle-thread cutting device and/or a fabric-presser device - Google Patents

Abstract

The invention relates to a device for multi-needle embroidering machines for the embroidering of vertical or horizontal surfaces with a needle-thread cutting device and/or a fabric-presser device. The essence of the invention is that the cutting device, arranged especially with the narrowest or widest lateral or vertical distance between the working embroidering points (in 4/4 measure), is arranged with one cutting element per thread or needle on a driven shaft so as to be movable towards the fabric surface and away from the fabric surface as a result of the rotation of the shaft.

Description

Title: Device for multi-needle embroidery machines with

a needle thread cutting device and / or a presser device.

Device for multi-needle embroidery machines with a needle thread cutting device and / or a presser device presser presser of known design exist from a stamped sheet metal unit arranged on a continuous shaft a plurality of fingers in the manner of a comb.

By turning the shaft, the presser device is placed on the The fabric level swung towards and away from her. The drive shaft and thus the pivot point the presser foot is arranged at a short distance from the plane of the fabric, see above that there is only a minimal distance between the presser finger support and the fabric level consists.

For cutting the needle threads (explosive threads) in connection with presser devices there are a variety of solutions.

For example, according to DE-OS 3023 159 for shuttle embroidery machines to carry out a row of multicolored embroidery the cutting device on each needle provided presser device to form attachable and by a lateral movement cut all threads in one operation. So that results Passive cutting of the threads. Such a device is for embroidery machines with multi-needle 4/4 individual embroidery points are unusable because the thread cut is individual made and the control in connection with the removal of the sticking end separately must be made.

When embroidering surfaces in a vertical or horizontal direction the embroidery points are arranged in the area and the fabric widths to be embroidered change by 28 mm (1 French inch). With embroidery machines according to DE-PS 1 485 494 Changes in the standard length of the 4/4 presser foot in the fabric height or in the width of the fabric inevitably by removing entire basic guides with considerable Expenditure of time, or large embroidery machines are used in the Height as one-tier machines fitted on top of each other in a 4/4 embroidery position arrangement and the width of the fabric to be embroidered changes.

When cut-to-size pieces clamped in frames or whole, ready-made items The embroidery frame can be used to clamp textiles in the overall frame and embroider them do not perform any pattern traversing if the type of presser mentioned at the beginning, that are designed as a unit stand in the way. This also applies to goods sold by the meter, where the edges of the fabric to be embroidered with their hanging devices, also that of the cardanic needle bar chains according to DE-PS 1 485 497 unhindered between the stitch plate of the Stöckli and the removable multi-needle 4/4 embroidery point according to patent application P 81 10 30 88.1 can be passed comfortably and unhindered.

Changes to the fabric width can be timed in certain applications occur irregularly; however, they are not entirely eliminated. A constant one However, there is a change in large multi-purpose embroidery machines where fabric width changes is a daily repeating process.

The object of the invention is to provide sufficient space between To create the fabric level and presser linkage in order to ensure proper passage to ensure a cardanic chain or an embroidery frame without significant effort, and to provide an effective, high-speed thread cutting device which is used for Carrying out the cutting process individually for each needle point through the free space cut through the thread directly on the length of fabric.

According to the invention, this object is achieved with the characterizing features of claims 1 and 10 achieved. Further refinements of the invention are the subject matter of the subclaims.

With the present invention it is possible in a simple manner without Effort and without loss of time the annoying 4/4 presser foot with the associated To make 4/4 needle cutters ineffective or to remove them or if necessary to make effective or to use again. The freedom achieved with the invention From a fabric line of 28 mm for the unimpeded passage of the cardanic chain or of the embroidery frame without interfering with the basic construction of the machine achieved that the fastening of the presser support in the supports around the desired Measure is shortened. To do this, it is necessary to split the presser foot.

Put 4/4 presser fingers in the remaining mounting bracket (e.g. tubular shape) by means of a bayonet lock or a corresponding twist-screw lock used. With the help of such a simple connection by hand can be in vertical or, in a horizontal embroidery position arrangement, every existing one of the specified size different fabric widths can be set or adjusted. The presser drive and its functionality remains unchanged. Due to the larger one The presser head becomes the distance and thus the greater angle of incidence to the fabric level adjusted accordingly. Important for the redesign of the 4/4 fabric presser opposite the previously punched sheets, however, is that the 4/4 presser finger in their Gaps no longer have different widths, but rather through the insert fingers are provided in length or height in the greatest parallel distance.

This is of particular importance because of the free space in between between two adjacent 4/4 presser fingers the new 4/4 thread cutting device must swing through it, so when the machine is at a standstill and when the machine is withdrawn Needle with retracted 4/4 presser foot the swinging needle thread trimmer first hits the fabric, in this case the pressure function of the presser foot in his switched off state takes over and glides on the fixed support of the Stöckli cuts the needle thread or the needle threads by lashing up or to the side. the The thread cutter device has a cutting element exchangeable, flexible cutting blade with angled cutting line. The needle thread is not cut with scissors or clamped with a clip, but it is cut diagonally in the high aisle capillary on capillary, so that also special strong and resistant yarn threads, for example on synthetic, reliable separated with the needle thread taut. Arrived at the top dead center, the needle thread trimmer automatically swivels into the starting position by spring pressure until your next request. The formation of the motor drive for the cutting device is chosen so that a reinforcement part is provided on the cutting element support arm, that makes it impossible to cut embroidery heads and at the same time reduces the length ensures the desired degree of embroidery.

In the needle thread cut there are still recognizable five different ones Functional sequences for different purposes accordingly; E.g. there is at the end of the embroidery a different functional sequence than when embroidering or when changing repeats or when changing from needle 1 to needle 2 within 4/4, etc.

These functional processes are related to the needle thread cut in one Secondary command center and are with or without program carriers on manual, mechanical or electronically recorded individually in groups and by simply pressing a button switched. If necessary, this also includes the Schiffli thread cut a. What previously only involved a lot of time with the large embroidery machine at a standstill was possible, now takes place in a fraction of the time the programmed frequency; the process corresponds to a kind of robot activity. Such a device represents an additional device within the framework of the section embroidery system according to P 31 14 370.9, and can be used in new machines as well as in operation existing machines can be retrofitted.

The execution of the needle thread diagonal cut can be done by hand with the help of a central lever or, as proposed by the invention, by a preferably electronically operating control circuit technology. This control can either be operated independently or in the existing large embroidery machine control be integrated.

From the group switching system for the needle thread cut, in the automatic Call-up sequence when the machine is switched off and the needles are in position are carried out in the rearmost dead center on the following occasions: embroidery-stitching-repeat structure change-needle 1 or 2 within the 4/4 basic repeat color change without jumping stitches within of the sample report. The cutting control takes place in the phase "Embroidery end when the machine is standing still Large multi-needle machine with the following commands (with or without ship side): a) Command to the thread catcher according to P 81 10 30 88.1 to push it up to the fabric line, b) at the same time command to the embroidery frame motor, the embroidery frame in a standard traversing to move so that when the thread catcher and the embroidery hoop move backwards to the zero position (starting position) of the needle to be separated from the embroidery base held in a known manner behind the thread catcher when the thread gives way is, c) by means of a counter-pressure spring on the thread catcher, the needle thread is now on Klemmer permanently clamped to a suction nozzle known per se, independently on the strength of the embroidery thread, d) Command to the central drive of the needle thread cutting device for pivoting between two adjacent 4/4 presser fingers through which takes over the switched-off presser function; the cutter hits against the fabric with the 4/4 long-boat Stöcklis behind it after P 31 33 333.8 and separates between two adjacent ones as you go up 4/4 presser fingers with the help of the flexible knife in an inclined course the under tension Needle thread in a uniform arbitrarily length to be determined in the embroidery remaining thread end of the order of 3 to 5 mm, regardless of whether there is is a thick, padded fabric or the finest oganza, from the embroidery base (In this case the needle thread cannot escape through the eye of the needle because it is caught by the clamp is recorded), e) the separate drive of the 4 / t long boat embroidery station according to P 31 33 333.8 gets during the backward movement of the thread cutting device Command and cuts all Schiffli threads at the top dead center in re-embroidery length.

When you have completed steps (a-e), you have made all needle and Schiffli threads of the last work embroidery sites in operation and cut for the Restart held ready. The bottom of the embroidery is now of all needle and Schiffli threads separately, and the coupon change can be carried out undisturbed.

Now do the same with the new fabric to be embroidered the central frame control of the overall embroidery process, starting with the thread cutting process "Embroidering!" and / or the cutting process by means of needle thread cutting devices. The process "Embroidering" is automatically and perfectly done in a minute at most the subgroup control completed, both on the needle and on the Schiffli-Seite, which is usually at least five to ten minutes takes up full machine failure. The frequency of such a circuit is about five to ten for a full working day, so that by eliminating the considerable machine downtimes the cutting device according to the invention (without ship left side) amotized within a relatively short time. The drive the thread cutting device is housed in a non-disruptive place, e.g. below the traverse.

The thread cutting device according to the invention with control can be used for existing large embroidery machines as well as for new large embroidery machines, regardless of whether the embroidery position is linear or vertical. To save space is the drive shaft with the 4/4 needle thread trimmer attached attached to the supports of the 4/4 presser foot in such a way that they are swiveled back State of the permanent presser foot movement to lie directly at the top point comes. The drive shaft of the needle thread cutting device is directly a positioning motor assigned for the reciprocating oscillating movement, with a programming can be provided in the program carrier.

The operating space for the 4/4 cutting device of a horizontal or vertical 4/4 embroidery position arrangement is the free space between two adjacent, 4/4 presser fingers arranged parallel to each other. Regardless of which one If the repeat structure is embroidered, all 4/4 cutting devices are always used in the entire machine actuated; Due to the branch channel in the Stöckli, only the previous one or one new work needle wires of the selected work embroidery site or within this for needle 1 or needle 2 are cut from bottom to top. The needle thread cutting process can be carried out in the previous way by initially with the machine at a standstill and the retracted needle extends the gate a sufficient length so that the cut state the thread cannot escape through the eye of the needle, or when Embroidery the embroidery can be plucked by hand and e.g. with a hand vacuum cleaner Will get removed. However, this needle thread cut to be carried out by hand can also fully automatic using the needle catcher / clamping device of the embroidery head can be made according to patent application P 81 10 30 88. Here goes the one mentioned first Thread catcher axially forward, at the same time the frame moves sideways to let the thread catcher pierce the fabric so that the frame has a Sideways movement in the blind spot of the needle thread from the eye of the needle can, so that at this moment in a backward movement of the frame of the needle thread is caught by the catcher and when the catcher moves backwards it takes the catcher with it as well presses it against the clamp and holds it.

This automatic process is controlled by an electronic function control for the various functional processes depending on the requirements of the embroidery, embroidery etc. completed in a matter of seconds, while so far a high expenditure of time with complete Machine standstill was required.

The invention is explained below in conjunction with the drawing one embodiment explained. It shows: FIG. 1 in a side sectional view the presser foot device according to the invention, Fig. 2 is a view of the presser foot device from left to Fig. 1, the middle presser finger from its clamping is removed, Fig. 3 in connection with the presser device, the needle thread cutting device in a view in the direction of the arrow according to FIG. 1, FIGS. 4a-d the cutting device in the operating state as well as in the switched-off state, each with a stop, Fig. 5a-c show the sequence of movements of the cutting process of the 4/4 cutting device of the invention, and FIG. 6 shows the diagram of the command center with secondary centers.

In the illustration according to FIG. 1, the material line or the clamped line is Substance labeled 1. The shaft 2 of the drive connection 3 is from the plane of the material 1 removed by a distance d that is large enough to accommodate embroidery frames, gimbals and the like. To wander through in the free space thus achieved. This free space is not required when using today's large embroidery machines. On the drive link 3, a support 4 is provided for receiving the presser bar 5, the presser finger approach 6 with subsequent presser finger 8 and pressure pad 9 takes up. The approach 6 is fixed in the presser bar 5 by means of screw connection 7 and through Solve the Screw 7 can be removed in a simple manner. Such a one There is easy solvability for each individual 4/4 presser finger. Above the drive shaft 2 and the screwing device 7 is a drive shaft 10 for the Thread cutting device arranged. A carrier 11 is arranged on the shaft 10, which has an arm 12 with cutting element 13, 14 at the free end. The needle is N, the drill indicated with B.

The presser fingers 8 are, as shown in Fig. 2, in the same way Distance from each other releasable on the presser bar 5 by means of a screw connection 7 established. The middle finger 8 is released from the screw connection 7 and removed drawn. The pressure pad 9 is, for example, circularly rounded and, as in FIG. 1 shown, formed bent up at the front end. For vertical sections of the embroidery machine In contrast to the vertical arrangement of the presser fingers, an offset occurs the finger around 900.

The shaft 10 of the thread cutting device is continuous and the individual 4/4 needle thread cutting devices are on the shaft 10 by means Bars or sleeves 11 pushed on. The entire arrangement is e.g. direct or stored indirectly on the crossbeam. The shaft 10 is driven by a drive motor 15 driven that is programmed or controlled unprogrammed. Between each two adjacent presser fingers 8 is a thread cutting element 12, 13, 14 the shaft 10 rotatably mounted. In the illustration according to FIG. 3, an extended one is on the left Cutting device shown, while in the illustration on the right the cutting device is drawn withdrawn. The cutting devices swing through during operation two presser fingers 8 through each. With P is always the one to be cut Needle thread indicated. The cutting knife 14 is attached at an angle to the cutting element, so that the thread also cuts at an angle during the oscillating movement of the knife element will.

Figs. 4a and 4b show the working cutting condition. The socket 11 An adjusting screw 17, which cooperates with a stop 16, receives an adjusting screw 17 on the shaft 10. If, as in the working cutting condition (Fig. 4a and 4b) the case, the set screw is screwed into the sleeve 11, it does not hit the stop when it is turned 16 so that it can rotate freely. In the illustration according to FIGS. 4c and 4d the unscrewed screw 17 hits the stop when it is turned 16, so that rotation is prevented and here is the associated 4/4 presser finger taken out.

5a, 5b and 5c show in chronological order how the 4/4 cutting element when the thread cutting shaft is rotated by the lever arrangement Swing through two 4/4 presser fingers to fabric 1 and the Stöckli bump, as well as being pushed upwards in an articulated manner and in a straight line, going upwards Press the needle thread to be cut with the angled cutting knife is grasped and severed. Here, the arm is firmly connected to the shaft 10 18 articulated with an arm 19 carrying the cutting element at a point 20, while the cutting arm 19 is articulated at 21 with the cutting element 22 which is the cutting knife 23 receives, is connected. The thread is denoted by 24 and in the illustration severed after 5c.

With 2 the presser shaft is indicated schematically.

In Fig. 6, the command center is in a schematic block diagram shown with the secondary centers 26-30. The command center 25 performs all functions for the needle thread cut. It is with all drives for the execution of functions switched that have to do directly or indirectly with the needle thread cut that Command center works preferably electronically. The functions of this command center include: 1. Command from the program carrier or by manual Determination for special occasions, switching off the machine, needle position in rear dead center.

2. Command only to the gate, the exact thread to be cut to bring into the position according to FIG.

3. Command to the thread catcher to extend and at the same time.

4. Issuing orders to the frame to shift it so that the one to be caught and the needle thread to be cut later comes exactly behind the thread catcher and at Going back with the clamp held in place by resistance.

5. Command to the thread cutting motor according to Fig. 3.

6. Command to briefly release the thread catcher with simultaneous.

7. Command to the suction device, the cut thread end when the clamping is released by lifting the thread catcher centrally with simultaneous Remove the cleaning lint and collect it in a collecting container, 8. Command to the work regulation (change of report), which 4/4 needles are to be re-assigned according to the pattern have to embroider and / or 9. Command which needle 1 or 2 according to number 8 additionally must be switched.

10. Issuing commands as to whether and when needle threads have to be cut. The designer determines whether there are very short, differently colored needle thread jumps a cut is necessary at all.

11. Issuing commands as to whether the machine is embroidered with endless equipment from roll to roll, and at what time the intermittent process should take place Has.

Here, too, further commands may appear as possible in practice or necessary result. This is partly due to the new fashions or new embroidery threads certainly. The respective time requirement can be determined using electronic time delay elements, Determine exactly on the basis of practical tests and the like. These previously described So far, commands have only been given by hand, with the machine had to stand still during this time.

From the command center go down according to different types Function and time requirements the retrieval in the form of various summaries in the Program carriers recorded or individually "pressed" in pushbuttons in the following subdivisions: The secondary center 26 for embroidery and / or the offset of the embroidery field. The secondary center 27 for embroidering the embroidering, cutting and vacuuming. The secondary center 28 for determining the structure of the repeat. The secondary center 29 for needle selection 1 or 2 within the selected work embroidery point, and the secondary center 30 in individual connection of the Schiffli thread cut according to P 31 33 333.8, in order not to create jump threads let (in contrast to the round hook, with the long shuttle, not only the needle but also of the ship's thread).

In addition to these five secondary command centers 26-30, others can be Secondary centers resulting from practice are added.

The indispensable work processes listed from embroidery practice, which have to expand due to the multi-needle 4/4 embroidery point according to P 30 16 567.4 are mainly carried out in pacing the machine, namely in length depending on the machine size from 3 m to 21 m in one direction, up in the upper (second) Floor, back the same way horizontally, then down to the lower one Floor. This process requires a lot of time in the event of a complete loss of production of the multi-needle machine in question and represents a significant expense factor.

With the help of the command center or a robot, it is possible to significantly reduce these work processes in terms of time. This is especially true with the pattern in needle thread painting through different sizes and different Repeat sizes with their variety of colors; the second needle is added to the WIehrnadel 4/4 embroidery point, where one of these needles is extremely strongly endowed with associated strong needle thread is - in comparison to lace curtains rustling, the embroidery-like products To make the embroidered motifs like this with a strong edging thread to embroider. The 4/4 multi-needle method can also be used to remove the embroidery-rich documents for Macrame-s number of stitches are embroidered.

Such a command center or robot is available as an additional device fundamentally different from known automats of a multi-needle embroidery machine. With such multi-needle embroidery machines that only produce simple embroidery, the frequency of the needle or thread change is significantly lower, so that this no command center is needed. However, this remains manual by pressing a button thread cutting device to be operated fully exist.

Claims (15)

Claims: 1. Device for multi-needle embroidery machines for embroidery of vertical or horizontal surfaces with a needle thread trimmer and / or a presser device, characterized in that the particular with the narrowest or widest side or vertical spacing of the work embroidery points (in 4/4 dimension) arranged cutting device (10-14) with a cutting element (13, 14) per thread or needle on a driven shaft (10) by turning the shaft (10) is arranged to be movable towards and away from the fabric surface (1). 2. Apparatus according to claim 1, characterized in that the cutting elements (13, 14) attached to the shaft (10) and rotatable with her arms with am cutting knives (14) attached to the front end of the arm with inclined (at an acute angle to the longitudinal axis of the arm) are fixed. 3. Apparatus according to claim 1 or 2, characterized in that the individual cutting elements (12-14) releasably placed on the drive shaft (10) are. 4. Device according to one of claims 1 - 3, characterized in that that the drive motor (15) for the cutting device shaft (10) is controllable, in particular programmable, driven. 5. Device according to one of claims 1 - 4, characterized in that that the cutting elements (12-14) are arranged so that they can be switched off individually, preferably can be locked in their rotation by a stop (16). 6. Apparatus according to claim 5, characterized in that the locking device a screwing device (17) which, by turning, engages with the stop (16) is coming. 7. Device according to one of claims 1 - 6, characterized in that that the drive of the cutting elements (12-14) e.g. by double-arm articulation (18-20) takes place, namely forwards and upwards and vice versa, so that the thread (23) cut at an angle in the high aisle or is separated. 8. Device according to one of claims 1 - 7, characterized in that that the cutting device oscillates automatically after reaching the top dead center is returned to the starting position by spring pressure. 9. Device according to one of claims 1 - 8, characterized in that that the cutting element is, for example, a replaceable cutting blade (14). 10. Device according to one of claims 1 - 9, with on a Schwenkwel le arranged, mutually pivotable presser elements, their free Press the end of the needle against the fabric to be embroidered and use it to embroider sets, characterized in that the axis of rotation of the drive shaft (2) of the presser device from the material plane (1) a sufficient distance (d) for the passage of Embroidery frames, cardanic chain or dql. has, and that the presser elements (6, 8) are arranged individually exchangeable (at 7) on the drive shaft. 11. The device according to claim 10, characterized in that the presser elements (4, 5, 6, 3) are designed in two parts, and that the removable finger (6, 8) means Bayonet or screw lock (7) is attached. 12. Apparatus according to claim 10 or 11, characterized in that that the fingers (6, 8) are, for example, tubular. 13. Device according to one of claims 10-12, characterized in that that the distance between two adjacent fingers (6.8) is 28 mm (4/4 dimension = 1 French Inches). 14. Device according to one of claims 1 - 13, characterized in that that the drive shaft (10) of the cutting device is above the drive shaft (2) the presser device, driven parallel to it and independently of it is arranged, and that the cutting elements (12-14) between the presser elements (4, 5, 6, 8) and in planes parallel to these towards and away from the fabric are pivotably arranged. 15. Device according to one of claims 1 - 14, characterized in that that the drive shaft (10) for the needle thread cutting device from a command center is controlled, e.g. with the help of robots.