DE2325424A1 - FOLDING DEVICE FOR SEWING MACHINES - Google Patents

Description

PATENT ADVOCATE

DR. HANS ULRICH

DEMDNCHENS ₁ OTTOSTRASSEIa

TELEGRAMS: MAYPATENT MÖNCHEN 2 * 32-p424

TELEPHONE CO8113 C93682

G-17-P-I / II70 Munich, May 1973

Q-ziy-Cr-AfiiHaa, sch

GELLMAN INDUSTRIES INC. in New York, N.T., V. St. A.

Folding device for sewing machines

Brief summary (abstract) of the invention; In a folding device for sewing machines, the Ar-. beitskopf, on which the folding blades and the folding channel are mounted, pivotally mounted so that it is rotatable about an axis parallel to the plane of the blades, Means are provided for adjusting the depth of the folds and at the same time adjusting the size of the pivot attachment of the working head while forming the fold. In addition, means are provided for adjusting the distance between successive folds.

The invention relates to pleating devices for sewing machines of the general type disclosed in U.S. Patents 2,669,955 and 3,331,335. A similarly formed pleating device for sewing machines is disclosed in US-Patontschrif t 3 0 10 621 described. In the first and last named patents, the invention relates only to the folding device. At the second

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said US patent, the pleating device is such combined with the sewing machine so that the automatic formation of folds is possible while sewing ·.

Such machines are in widespread use for laying and quilting folds along the top edges of draperies and draperies. When using such machines it is required at the bottom of each of the wrinkles that are around Extend inward a predetermined distance from the top of the fabric to provide a double stitching and on At the bottom of the folds a shorter double stitching seam running at right angles to it. To this end, the sewing machine instructs a movable slide plate and a presser attached to it, which is on the fabric in one place that is adjacent to the fold to be quilted and holds the fabric while the slide plate is under the Control by the mechanism of the sewing machine so moved will that the fabric in relation to the reciprocating needle of the sewing machine to form the desired topstitching is moved.

It is desirable in such machines that the machine automatically sew a plurality of pleats in succession Wrinkle depth forms that from center to center - one at a time have the same predetermined distance from each other. It is also desirable that both the wrinkle depth and

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the distance between the columns according to the pattern of the folds The hanging or curtain to be laid can be set can. For example, to provide a pleated curtain with pleats with a depth of 12.7 mm that run from center to center 76.2 mm apart are different settings required than for pleats 19 mm deep and with a center-to-center gap of -101.6 mm.

It is an object of the invention to provide means in a simple and quick way to adjust for that. allow the above-mentioned purposes.

When operating such a machine, the operator each of the creases that have been laid are stripped by hand from the creasing device and placed on the slide plate placed where they-grabbed by the presser and while the quilting process is held. In order to make the operator's work easier, it is important that the folding device so constructed and with regard to the sewing

I '

machine is arranged so that it is the operator it is possible to feed the laid crease to the sewing machine in the correct relation to the needle, with only a minimum of Effort and skill is required. It is the object of the invention to solve this problem.

A preferred embodiment of the invention is described below described with reference to the figures. In the figures show:

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FIG. 1 shows a plan view from the front of a sewing machine having the device according to the invention;

FIG. 2 shows a plan view from above of the folding device;

Figure 3 is a side plan view of the folding device, partially in section along line 3-3 of Figure 2;

Figure 4 is a section along line 4-4 of Figure 2;

Figure 5 is a plan view from above of the folding head, with the adjustment cams removed;

FIG. 6 shows a top view vx> n at the front of the folding head;

Figure 7 is a section along line 7-7 of Figure 6;

FIG. 8 shows a plan view of the setting cams;

FIG. 9 is a plan view of the setting cam unit;

FIG. 10 shows a section along the line 10-10 from FIG. 9s

Figure 11 is a semi-diagrammatic plan view of the Sewing machine slide plate;

Figures semi-diagrammatic top and top views, where-12, 13 in the relationship between the folding device and the sewing machine is shown at the beginning of a work cycle;

Representations similar to figures in a later Stal4, 15 medium of the duty cycle with the workpiece entering the pleat assembly;

Representation similar to the figures in an even later 16, 17 stage of the work cycle, with the pivoting of the folding head is shown closing the channel;

Figures similar to figures in a later Sta-18, 19 dium of the work cycle, whereby the folder is completely asleep and the folding device is moved inward to create a sag ?; dos work «tücks: and

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Figures similar to representations in an even later 20, 21 stage of the working cycle, with the beginning of the

Stripping of the workpiece from the folding

device is shown; and

Representations similar to figures near the end of the work cycle 22, 23, wherein the workpiece 'with a finished The fold is stripped from the folding device and held by the operator that it can be inserted into the sewing machine for the next work cycle the fold is quilted »

As the drawings show, the entire pleating unit is open a pivot plate 1 mounted, which is pivotably mounted on the base plate 2 by means of a pivot pin 3, which in turn is attached to a table top 4 on the the sewing machine can also be mounted. The sewing machine has a movable slide plate 5 and a presser foot 6 to hold the workpiece, and the slide plate and the presser foot are in different stages of the work cycle to the folding device in a ratio such as it is shown in Figures 11-23. As FIG. 11 shows, the slide plate has an L-shaped slot through which the needle moves to form the L-shaped lock stitch rows shown at 8. The presser foot can also be used with a side gauge 9 and an adjustable rear gauge 10 be provided so that the operator can use the work

f
position correctly for sewing. .

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The folding device shown in Figures 2-6 has a working head 11 with a lateral direction, From this he sticks out an arm 12, on which a middle one Sheet 13 is fixed, and with a pair of movable ones Sheets 1 ¥ and 15, which are mounted on opposite sides of the fixedly arranged sheet 13 so that they can pivot, that they are parallel to the plane of the sheet 13 about axes l6 and are pivotable. Usually sheets 14 and 15 held in the open position shown in Figure 7 by springs. - -

Also attached to the working head 11 extends over the blades 13, 14 and 15, a U-shaped fold channel 20, the cooperates with the leaves to create folds in a manner to be described. The channel 20 is on a cross bar 21 mounted, which is connected to the piston rod 22 which passes through the cylinder 23, with the help of which the Channel is operated. With the crossbar 21 connected guide rods 24 extend into channels 25 in the working head 11 and guide the fold channel during its back and forth Movement when laying folds. An adjustable guide link 26 is attached to the side of the arm 12 and serves the purpose of assisting the operator in guiding the material to support in the position suitable for folding.

It should be noted that the lower edges of the channel 20 are parallel to the upper edges of sheets 13, l-'i and 15 are. It is ever-

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but it should also be noted that the axes of the piston rod 22 and the guide rods 2k with respect to a perpendicular to the edges of the blades 13, 14 and 15 are somewhat inclined. That is, the axes and lines mentioned through the edges mentioned meet at slightly obtuse angles. As a result, when the channel 20 moves downward to form a fold, it moves somewhat laterally and exerts an abrasive or wiping effect on the fabric, making it easier to form smooth and even folds.

Normally the swivel plate 1 is biased counterclockwise by a spring 28, one end of which is attached to the swivel plate 1 and the other end to the base plate, so that the swivel plate is held against an adjustable counter-holder 29 mounted on the base plate 2. By loosening the bolts "^ O for the purpose of adjusting the counter-holder 29, the working head 11 and the folding blades can be brought into the correct angular position in relation to the slide plate 5. In the correct adjusted position, the blade / with the long lockstitch line 8 in the outermost The counterclockwise position of the slide plate 5 according to FIG. 18 can be parallel.

According to FIG. 3, means are provided for connecting the working head 11 and the described parts assigned to it with a slide 31 »whereby these means boron 31 screwed L-shaped Ilaitcarm 32 include. Of the

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The slide 31 and the working head 11 move, in a certain way when they are actuated by the piston rod 33 of the cylinder 34, the piston rod being connected to the slide via the angle piece 35 and the connecting link jG * The cylinder is rigidly mounted on an adjustment plate 37 which is connected with the aid of "pins: 38 to guide blocks 39 in which grooves 40 are provided" in which the slide 31 is slidable , which are fixedly mounted on the swivel plate 1.

Means are provided for adjusting the distance between successive folds, consisting of a Just ierschraub 46, which in one on the pivot plate. 1 attached Threaded block 47 is screwed in. The end of the adjusting screw can be rotated in an opening in the downwardly extending flange of an angle arm 48 which is connected to the adjustment plate 37 by means of screw bolts 49 is. When the screw 46 is rotated, the plate 37 supporting the cylinder 34, the slide 3I and the slide 3I move Ax-beitskopf 11 together as a unit until the desired set position is reached, which is mounted on a plate 37, indicating the distance between folds Scale 51 is displayed.

This setting determines the position of the working head in his fully extended position, which he at the beginning and nni

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Assumes the end of the working cycle (see FIG. 12), and determines thus the distance between the pleating device and the long lock stitch line at the time when the fold-laying device closes for laying a fold.

The working head 11 is pivotably mounted on the support arm 32 so that it is rotatable about a horizontal axis which is parallel to the plane of the sheet 13 and perpendicular to the axis of the cylinder 3 ^! i runs. For this purpose, ball bearing connections 55 and 56 are mounted on legs 57 and 58 fastened near the ends of the holding arm 32, the ball joint connections having shafts 59 and 6O fixedly arranged in the working head 11.

Means are also provided for regulating the fold depth, these means being adjustable so that the fold depth can be changed in the desired manner. In the embodiment described here, means are also provided for automatically and simultaneously adjusting the magnitude of the pivoting movement of the head 11 on the ball-and-socket joints 55, 5 & The greater the wrinkle depth, the larger the material must be. For this purpose, according to the figures 8-10 is provided a cam plate 65 which is arranged in a cut-GG in the working head 11, this cam ivobei up a shaft 67

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which extends through the cover plate 68. On the outside of the cover plate, a selection device 69 and a control button "JO" are mounted on the shaft.

The cam disk has two circumferential cam faces 71 and 72, which are separated from one another by a groove 73. The cam surface 71 controls the depth of the folds. The cam surface controls the size of the pivoting movement of the working head 11. The cam surfaces are preferably designed step-shaped in the manner shown, with each step being assigned to it Number on the dial 69 that the operator has set the wrinkle depth to which the machine is indicating. A pin 75 is mounted on the cross bar 21 in such a position that that with the cam surface 71 comes into engagement when the head 11 is actuated is moved downward by the cylinder 23. An alignment pin 76 passes through a flange 77 of the holding arm 78, which is screwed to the holding arm 32. The flange 77 extends below the working head 11 in such a Position that the pin 76 engages the cam surface 72.

1 ■

The operation of the machine is shown diagrammatically in Figures 12-23 shown * Before starting a folding process, the counter holder is 29 adjusted to ensure that the Swivel plate 1, as previously described, arranged correctly

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is. At the beginning of a folding process, the operator puts first adjust the machine to the desired pleat spacing in that the lock button 53 is loosened so that the adjusting screw 46 can be actuated and the plate 37 is moved to the desired position, which is indicated by the scale 51 is shown. The operator then sets the desired depth of folds by the Button 70 in the right indicated by the dial 69 Position is set. Figures 12 and 13 illustrate the position of the individual parts at the beginning of a folding step. Before any creases are formed, the operator places the fabric 80 on the pusher plate so that that the front transverse edge 6l rest on the rear gauge 10 and the longitudinal edge 82 on the lateral gauge 9, and presses a foot lever, not shown, so that the Fabric is pressed against the slide plate. Further depressing the foot pedal starts the quilting process, and it will an L-shaped line corresponding to the pattern shown from Lock stitches attached. In the further course of the quilting process, the slide plate is first turned counterclockwise, as shown in Figure 14, while the operator is maintaining a slight tension of the fabric in the longitudinal direction progressing the longitudinal edge of the fabric into the folding device between the sheets 13, l4 and 15 and the fold channel 20 moves. The quilting process continues until the gate reaches the end of its counter-clockwise movement,

at this point the needle is on the corner do the lockstitch pattern as shown in Figure 16. At this point in time, the longitudinal edge has also reached the guide member 26, and the slide plate has moved to such a position that the long row of lock stitches is parallel with the sheet runs «Shortly before the gate valve reaches this position, the cylinder 23 and the piston are activated and move the fold channel downwards, so that at the time when the pusher plate reaches this position, the folding element 20 completes its downward movement has carried out and the folding device closes and the first fold 83 forms. During the closing of the folding device is meanwhile the working head 11 on the ball joint connections 55 j 56 pivoted, as Figure 17 shows, so that the pleat can be formed without undue tension on the fabric between the pleating device and the needle is exercised.

Previously, the operator had to for a slack in the Provide material between the pleating device and the needle by allowing the material to be removed prior to closing the device has been manipulated by hand; this process required long practice to achieve the. necessary skill, so .that on the one hand a sufficient slack is provided and on the other hand, excessive slack should be avoided. In addition, there was a certain risk dor bodienunssperson. Clumsy or careless

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Term handling often had the consequence that the quilting process had to be stopped, which in turn resulted in a loss Time and performance showed.

As FIGS. 18 and 19 show, the now moves Slide plate forward towards the folding device to form the short row of lock stitches while at the same time the folding device is actuated by the piston rod 33 which advances this towards the slide plate, so that there is a slack in the fabric, as indicated at 84 » is .. While the pleating device remains in this advanced position, the short row of lock stitches completed, and then the. Gate back. To double the short row and will then swiveled clockwise, as shown in Figures 20 and 22, to double the long row of lock stitches. While this takes place, the operator grasps the newly formed Fold 83 while squeezing the hinged ones Sheets together, as shown in Figure 21 »Then the operator begins, to strip off the fold by shifting it in the longitudinal direction of the fold-laying device. In addition Time when the slide plate is directed clockwise Movement reached and the needle reaches the end of the long lockstitch row (see. Figure 22), so that the quilted As fabric can be released and removed from the slide plate, the newly formed fold 83 is completely removed from the Stripped of the folding device and is then

;, in fact

operator placed on the slide plate, in such a position that they during the next Duty cycle is pressed and quilted. In the meantime, the folding device is operated by actuating the piston rod 33 has been withdrawn to its original position.

Patent claims

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Claims (1)

4ί Patent claims c, h e 1. Folding device for sewing machines, geke η η - characterized by a slide (3l) i through a working head (ll), through means (32) that connect the working head (ll) with the slide (31), through a to your working head (ll) assembled fixed folding insert sheet (13) j dui-ch a pair of movable sheets (l4, 15) which are pivotably mounted on the working head (11) on opposite sides of the • fixed sheet (13) so that they about axes (l6, 17) parallel to the fixed sheet (I3) are rotatable, by means (33i 3 ^) for reciprocating the slide (31) and the working head (ll) along a path of movement which corresponds to the plane of the permanently arranged sheet (I3) runs vertically, and through means (55j 565 57i 58, 59j'6O) -for pivotable 'attaching the working head' (ll) to said connecting means (32) so that the working head (ll) about an axis is pivotable, which runs parallel to the plane of the fixed sheet (I3). 2. folding device according to claim 1, characterized by means for adjusting the rest position of the working head (II) relative to the connecting means (32). 3 09860/0866 3. Folding device according to claim 1 / characterized by an inverted U-shaped Folding channel (20) and by means (21, 24, 25) for mounting the channel (20) on the working head (ll), so that the channel (20) can be moved back and forth with respect to the working head (11) and with the sheets (13j 14, 15) for laying folds is moved in and out of engagement. 4. folding device according to claim 3j characterized by means (65, 71, 72) for adjusting the size of the said reciprocating movement, so that thereby the depth of the folds is adjustable. 5 »folding device according to claim %, characterized in that said adjusting means have a cam disk (65) with two circumferential cam surfaces (71 _} 72) separated from one another as well as means (67, 70) for rotating the cam disk (.65) about one to the plane of the permanently arranged sheet (13) vertical axis, so that at the same time the depth of folds and the rest position of the working head (ll) relative to the connecting means (32) are set. 6. Folding device according to claim 1, characterized by a fixed base plate (2), by a pivot plate (I) ₁ pivoted on this pivot plate by a on the pivot plate (l) vcr- 3 0 9 8 5 0/0866 -J- slidably arranged adjusting plate (37) and by means
(46, 47) for adjusting the position of the adjustment plate (37) in relation to "the pivot plate (1), whereby the size of the said reciprocating movement is adjusted and thus the distance between successive folds is controlled. 7 · folding device according to claim 6 ,. characterized by - means (46) for locking the adjustment plate (37) in a desired set
Location. - '. 8. folding device according to claim 6, characterized by a on the base plate (2) mounted Gegenha'lter (29), by spring means (28), the. hold the swivel plate (l) against the counter holder (29), and
by means (30) for adjusting the position of the counter holder (29) on the base plate (2). 9. Folding device according to claim 1, geke η marked by a reversed U ~ f örniigen
Folding channel (20) and means (21, 24, 25) for fastening the channel (20) to the working head (11) can be moved back and forth with respect to the same, the axis of the
The reciprocating movement of the channel (20) with respect to the edges of the sheets (13, 14, 15) is oblique to the vertical. 31) 9850/0886