DE3512772A1 - Sewing machine to develop piped openings in fabric being stitched - Google Patents

Abstract

The sewing machine to developed piped openings in the fabric being stitched has an electromotor with a needle positioning unit and a common drive for an arm shaft of the twin-needle sewing machine, the fabric advance mechanism and the cutter to work simultaneously. At least one incremental pulse generator delivers pulses according to the sliding movement of the fabric advance mechanism and the movable position of the angle cutting blade. A microcomputer, with an ROM, has input units and a control for insertion of the machine-related geometric data and the manually-inserted length and correction values for the piped opening. With the pulses from the incremental pulse generator, command signals are delivered for the upwards and downwards movement of the needles, the operation of the central blade, and the stop and start actions of the angle cutting blade. Pred. additional electro-motor is provided to operate the fabric advance mechanism and the cutter. The inputs are multi-position preselector switches or keys. The outputs at the electro-motor are magnetic valves or electro-magnetic clutches, at least one motor. The second electro-motor if fitted, is a DC motor or a step motor.

Description

P / N / 030 / DE 2/1

Sewing device for making piped openings in

Sewing parts

The invention relates to a sewing device for producing piped openings according to the preamble of claim 1.

It is a sewing device for producing piped openings according to the preamble of claim 1 (DE-OS 22 40 617) known, the inter alia horizontally displaceable cutting blocks with angle cutting blades that can be moved vertically upwards by pressure means having. These cutting blocks are slidably mounted on parallel guide rails that are fixed to the frame. Any cutting block has an adjustable stop acting as an adjusting means. The known sewing device also has two horizontally movable driver brackets, each of which has a driver that is temporarily adjustable against the aforementioned Stop moves. This ensures that the distance between the angle cutting knife and the length of the flap match exactly Piped pocket opening with flap made possible. In sewing practice, the relatively unstable sewing material causes Tolerances are often compensated by the fact that fixed, the basic setting of the pocket opening sewing machine Values, e.g. the starting points for activating the angle cutters and, if applicable, the starting points for the start of the seam and / or the seam end can be changed by empirically determined correction values. These readjustments, e.g. through the adjustment of the aforementioned stops on the cutting stands must be from

professionally trained staff and often less accessible Bodies are made. Another disadvantage of the known sewing device can be seen in the fact that at the mentioned Setting means, no orientation aids are provided from which the extent of the adjustment can be read directly.

The invention specified in claims 1 and 2 is the The object of the invention is to create a sewing device that allows changes from the specified setpoint values to those of the basic setting correspond to the pocket opening sewing machine concerned, are possible in a very simple way, the points of use for the angle cutting knife as for the center knife, possibly also the Use points of both seams by entering length-related correction values in one easy to reach and in the seamstress' field of vision provided control unit are changeable.

With the sewing device according to the invention it is now possible, proceeding from the basic setting of the pocket opening sewing machine the application points for the parallel seams, for the center knife and for the angle cutting knife individually or move forward or backward a defined distance together.

An expedient further development of the object according to claims 1 and 2 is described in the subclaims. With the design of the sewing device according to claim 1, a very useful design is achieved because a common Drive for the two-needle sewing machine, the material transport device and the cutting device is provided. In the embodiment of the sewing device according to claim 2, the

Two needle sewing machines powered by an electric motor Sewing material transport device and the cutting device driven by at least one additional electric motor.

Several AusfUhrungsbeispiele the invention are based on the Fig. 1 to 9 described. It shows:

Fig. 1 is a perspective view from which the principle Structure of the sewing device according to claim 1 can be seen

2 shows a front view of the control unit with a view of its front panel

3 shows a block diagram from which the basic structure of the sewing device can be seen, which is suitable for producing pocket openings without a flap

4 is a block diagram showing the basic structure of the sewing device with a common drive, which is suitable for producing pocket openings with flaps

5 is a block diagram showing the basic structure of the sewing device with two drives, which is suitable for producing pocket openings with flaps

6 shows a schematic representation of a pocket opening

Fig. 7 is a schematic representation of part of a pocket opening, in which the point of use of the angle cutting knife and the center knife by changing the setting of the relevant preselection switch relative to the start of the seam by a certain distance

was relocated

8 shows a schematic representation of a pocket opening with a flap, in which the points of use of both sewing needles, the center knife and the angle cutting knife have been relocated by changing the setting of the relevant preselection switch

Fig. 9 is a perspective view from which the principle Structure of the sewing device according to claim 2 can be seen.

The sewing device according to the invention is part of an already from DE-OS 22 40 617 known pocket opening sewing machines, the detailed description of which can be dispensed with here. Said sewing device includes, inter alia, one shown in FIG. conventional two needle sewing machine 3 with one between the Sewing needles 13 provided, cutting in the vertical direction Center knife 14 for producing a slot parallel to the seam for the pocket opening. The two needle sewing machine 3 is attached to the table top of a frame not shown in Fig. 1 and is from one below the table top arranged electric motor 1 with needle positioning device - also referred to as positioning drive - driven. For this purpose, a V-belt 20 is below the The table top and the intermediate shaft 21 mounted in the frame are driven, from which via a coupling 22 and another V-belt an arm shaft 2 of the two-needle sewing machine 3 is driven. The other end of the intermediate shaft 21 leads into a reduction gear 24. A toothed belt pulley 26 is firmly connected to the output shaft 25 of the reduction gear 24. A

Toothed belt 27 drives a arranged above the table top, frame fixedly mounted shaft 28 with which the toothed belt pulleys and 30 are firmly connected. In addition, the shaft 28 is a per se known incremental pulse generator 6 firmly connected, the Issues pulses to a control unit 10 attached to the table top. Said impulses correspond to the displacement movement of a known, horizontally movable material transport device 4 and the horizontal displacement movement of a movable Angle cutting knife 15, which is part of a cutting device for the production of the two grooves 31 of the pocket opening is.

Another toothed belt pulley 32 is also above the The table top is fixed to the frame, but can be rotated. The timing belt pulleys 30, 32 are wrapped around by a toothed belt 33. The aforementioned sewing material transport device 4 is known and consists essentially of two material clamps 34, with which one is also known, by a pressure medium or electromagnetically actuatable terminal 35 is firmly connected. After application of pressure medium or after switching on an electromagnet, the Clamp 35 is closed and the horizontal displacement movement of the sewing material transport device 4 is effected.

The cutting device 5 is already from the German patent application P 34 04 758 known and therefore does not need here to be described in more detail. It essentially consists of two arranged below the table top, temporarily in Vertically upwardly movable angle cutting knives 15,

The angle cutting knife 36 is in a stationary cutting block stored, while the angle cutting knife 15 of an in Horizontally displaceable cutting block 37 is received. The displacement movement of the cutting block 37, which takes place in the opposite direction to the displacement movement of the sewing material transport device 4, is by means of a pressure medium or electromagnetically causes actuatable clamp 39, which is firmly connected to the cutting block. After application of pressure medium or after Activation of an electromagnet is known in the art Toothed belt 40 between the two jaws of the clamp 39 clamped. According to Fig. 1, the toothed belt 40 wraps around a toothed belt pulley 41 and a fixedly connected to the output shaft 25 further, rotatable toothed belt pulley 42, which is fixedly mounted on the frame underneath the table top.

From Fig. 1 it can be clearly seen that the sewing and cutting tools the two-needle sewing machine 3 and the material transport device 4 and the angle cutting knife 15 of the cutting device 5 have completely synchronous movement sequences after appropriate coupling or clamping. This Synchronous operation is used in the arrangement with separate drives 5 and 9 achieved in a known manner by regulating the electric motor 46.

An essential component of the invention is the sewing device a control unit 10, which is attached to the table top within easy reach and in the seamstress' field of vision. A front panel 44 the control unit 10 is shown in FIG. It has several Multi-digit preselection switch 43 for setting preselected

Seam lengths Ll, L2 and L3 as well as other multi-digit preselection switches 16 on. With the latter you can enter numbers from "zero" to "nine" on the points of use of the sewing needles 13, des Center knife 14 and the angle cutting knife 15,36 at the beginning and at the end of a pocket opening influence, e.g .:

The preselection switch marked with A affects the first Insertion of the sewing needles 13 at the beginning of the seam, the preselection switch marked with D influences the last one Insertion of the sewing needles 13 at the end of the seam,

the preselection switch marked with B affects the first Incision of the center knife 14 near the beginning of the seam, the preselection switch marked with E affects the last one Incision of the center knife 14 near the end of the seam, the preselection switch marked with C affects the position of the Einwickschnittes produced by the angle cutting knife 36 31 near the start of the seam,

the preselection switch marked with F influences the position of the Einwickschnittes 31 produced by the angle cutting knife 15 in the vicinity of the seam end.

In addition, the control unit 10 includes a microcomputer 7 and a read-only memory 8 (EPROM or ROM or PROM). In the read-only memory 8, the machine-related geometry data are in Filed in the form of binary coded numbers. The following are referred to as machine-related geometry data:

1. All length related to the point of entry of the sewing needles 13

dimensions in terms of the spatial arrangement of the front of the Insertion station provided for the sewing point, in the area of which - usually 180 mm - the pocket opening to be sewn can be placed.

Annotation:

In the case of pocket openings without a flap, this area is shown in known way by two arranged in front of the sewing point Marking lights marked.

In the case of pocket openings with flaps, said area is through marked mechanical stops, one of which is a stop as a contact point for the flap front edge, the other serves as a contact point for the rear edge of the flap.

2. All length dimensions related to the insertion point of the sewing needles 13 for the spatial arrangement of the center knife

3. All length dimensions related to the insertion point of the sewing needles 13 for the spatial arrangement of the angle cutting knife 15 and 36.

It has been around for sewing pocket openings with flaps since It has long been known to provide a reflex light barrier 11 (see FIG. 4) at a defined distance in front of the sewing needles. Will the front and rear edges of the flap are scanned, the length of the pocket opening seam is exactly the length of the just submitted flap derived. The scanning signals of the reflex light barrier 11 are sent to the microcomputer as shown in FIG 7 delivered ,.

As already mentioned at the beginning, the incremental pulse

encoder 6 to the microcomputer 7 pulses that the shifting movements (Travel paths) correspond to the sewing material transport device 4 and the angle cutting knife 15, both during sewing of pocket openings that are equipped with or without a flap. The routes are determined by the impulses from the pulse generator 6 the sewing material transport device 4 and that of the movable Angle cutting knife 15 monitored exactly. The great accuracy This monitoring results from the fact that the pulse generator 6 e.g. delivers three impulses over a millimeter of travel.

Finally, the sewing device according to the invention also includes the output elements 12, which according to claim 3 by the electric motor 1, by solenoid valves 17 and by electromagnetic clutches 18 are embodied. Through the solenoid valves 17 is the closing and opening of the terminals 35 and 39 causes. As Electromagnetic clutches 18 designated actuators are: The provided on the intermediate shaft 21 clutch 22, the Activation of the two-needle sewing machine causes, and also two Clutches provided in the reduction gear 24, not shown in FIG. 1, for different feed speeds.

In the embodiment of the invention according to claims 2, 4 and 5, at least one additional one is regulated in a known manner Electric motor 46 (see. Figs. 5 and 9) required, either a DC motor or a stepper motor. How out 9, the electric motor 46 drives the sewing material transport device 4 and the cutting device 5. In this embodiment, the reduction gear 24 on

is

the two electromagnetic clutches contained therein as well as on the V-belt 20, the intermediate shaft 21 and the clutch 22 be waived.

The operation of the sewing device is described below, those for the production of pocket openings with and without flap suitable is.

If all the preselection switches 16, which are shown in Fig. 2 with A to F are marked, have been set to the number "five", an opening is made, the points A to F of which are from Fig. 6 assume the position shown. A pocket opening formed in this way corresponds to the basic setting of the pocket opening sewing machine. However, deviations from this normal form of the pocket opening are quite conceivable.

So it is when sewing pocket openings without a flap in loose woven or loosely knitted fabric expedient, the Einwickschnitte 31 generated by the angle cutting knife 15, 36 by a to lay a certain distance, i.e. point C lies behind point A (see Fig. 7) and point F lies in front of point D. Starting from the normal case shown in Fig. 6, the points C and F are thus moved closer together. This avoids that when turning the finished pocket opening tear the corners of its opening and thereby fray. The runaway that at tightly woven sewing material hardly occurs, is typical for loosely woven or knitted sewing material. The relocation of point C and the Moving the point F forward is done in a very simple manner reaches that the seamstress at the preselection switch marked with C. 16 the number "six", on the one marked with an F.

Preselection switch 16 sets the number "four". Basically: If the set number is greater than "five", the relevant Function triggered later. If the set number is less than "five", the relevant function is triggered earlier. Should that Extent of relocation, e.g. point C, is even greater, is a number greater than "six", in the extreme case "nine" to adjust. The opposite applies if the amount of advance, e.g. point F, is to be greater. According to the Relocation of points C and F should be done by setting accordingly the preselection switch 16 marked with B and E also points B and E (see. Fig. 6) for switching on and off of the center knife 14 are relocated.

It can be useful before sewing a pocket opening with a flap starting from the basic setting, move point A forward and move point D back (see Fig. 8). This enlarged the distance between points A and D. Said relocation of both points is advisable if there is a pocket opening with flap show bumps on flap 47 after turning, mainly in area 48 of the front edge of the flap and in the area the rear edge of the flap. To avoid the bumps, the seamstress places the number "four" on the preselection switch 16 marked with A and the number "four" on the preselection switch 16 marked with D. the number "six". Corresponding to the relocation of points A and D, points C and F as well as B and E are to be relocated accordingly.

Claims (5)

4800 Bieieföid 1 P / N / 030 / DE 27Γ Patent claims: 1. Sewing device for creating piped openings in Sewing parts, the sewing device consisting essentially of one of an electric motor with a needle positioning device powered two-needle sewing machine with arranged between the sewing needles, movable in the vertical direction Center knife, strip from a folding device for the piping, from a sewing material transport device for transporting the sewing part from a loading point via a sewing point a cutting point, from a cutting device, the two ί has vertically movable angle cutting blades and consists of electronic switching and control means to achieve predetermined work sequences of the sewing and cutting tools depending on the movement of the sewing part,
- characterized by the combination of the following features: a) from a joint consisting essentially of the electric motor (1) with a needle positioning device The drive is an arm shaft (2) of the two-needle sewing machine (3), the material transport device (4) and the cutting device (5) driven simultaneously, b) supplies at least one incremental pulse generator (6) Pulses that control the shifting movement of the sewing material transport device (4) and the displacement movement of the movable angle cutting knife (15) correspond, c) one consisting of a microcomputer (7), a read-only memory (8) and input elements (9) Control unit (10) links the machine-related geometry data stored in the read-only memory (8) as well as the Lengths and correction values entered manually in the input elements (9) for the piped to be sewn Openings with the pulses supplied by the incremental pulse generator (6) for control commands for the Control of the output elements (12), the onset of the up and down movement of the sewing needles (13), the input and Switching off the center knife (14) and the beginning and end of the displacement movement of the movable angle cutting knife (15) effect. 2. Sewing device for making piped openings in sewing parts, the sewing device consisting essentially of one of an electric motor with a needle positioning device powered two needle sewing machine with between the Sewing needles arranged, vertically movable center knife, from a folding device for the piping strip, from a sewing material transport device for transporting the sewing part from a loading point via a sewing point a cutting point, from a cutting device which has two vertically movable angle cutting blades and from electronic switching and control means to achieve predetermined work sequences of the sewing and cutting tools in There is a dependency on the movement of the sewing part, characterized by the combination of the following features: a) from a drive consisting essentially of the electric motor (1) with a needle positioning device, a The arm shaft (2) of the two-needle sewing machine (3) is driven -and the sewing material transport device (4) and the cutting device are operated by at least one additional electric motor (46) (5) powered, b) at least one incremental pulse generator (6) delivers Pulses that control the shifting movement of the sewing material transport device (4) and the displacement movement of the movable angle cutting knife (15) correspond, c) one consisting of a microcomputer (7), a read-only memory (8) and input elements (9) Control unit (10) links the machine-related geometry data stored in the read-only memory (8) as well as the lengths entered manually in the input elements (9) and correction values for the piped openings to be sewn with the values provided by the incremental pulse generator (6) Delivered pulses to control commands for the control of the output elements (12), the onset of the on and Movement of the sewing needles (13), the switching on and off of the center knife (14) and the beginning and end of the sliding movement effect of the movable angle cutting knife (15). 3. sewing device according to claim 1,
characterized in that the input elements (9) are multi-digit preselection switches (16) or keyboards, and that the electric motor (1), solenoid valves (17) and electromagnetic clutches (18) are used as output elements (12). 4. sewing device according to claim 2,
characterized in that the input elements (9) are multi-digit preselection switches (16) or keyboards, and that the electric motor (1), at least one electric motor (46), solenoid valves (17) and solenoid clutches (18) are used as output elements (12) . 5. Sewing device according to claims 2 and 4, characterized in that that the electric motor (46) is a direct current motor or a stepping motor.