JPS60116395A - Stitching apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing device, and more particularly, to a sewing device that sews a large number of objects to be sewn into a sewn product having seams of the same shape. For example, when sewing a large number of items of the same shape, such as inner bags for pockets, overlap two pieces of cloth, use a presser mold with a slit in the shape of the sewing area, and insert it from the top and bottom, and insert it into the slit. A sewing method in which the needles are moved side by side, and a sewing method in which upper and lower presser dies are connected to an XY drive shaft and driven under control are used. However, all of the above methods require the creation of a presser mold, the need to accurately position the slit and the position where the needle will pass;
The disadvantage is that the most work time is required for setting and taking out the fabric, which involves opening the pattern, setting it in the correct position, and opening and removing the fabric pattern after sewing, resulting in a large amount of wasted time.

The present invention eliminates these drawbacks, and its features are that it eliminates the need for a top-down inserting die, eliminates lost time such as opening and closing of the die, and setting time for fabric, and allows the work to be sewn to be placed on the sewing machine table in normal work. In the same way, place the sewing feeder on top of the
The sewing feeder is connected to a control and drive device that rotates at an angle of θ with the position of the needle of the sewing machine as the center point. By making sure that the tangent line of the sewing shape to be sewn always goes straight to the needle and matching the sewing method of the sewing machine,
As with regular manual sewing work, we use the sewing machine's feed dog and presser foot to achieve a good sewing finish with firm seams, to always form sewing lines of the same shape even when sewing a large number of pieces, and to keep the shape of the pattern. To provide a sewing device that eliminates lost time such as opening and closing and performs sewing in an extremely short time.

Hereinafter, the present invention will be explained with reference to the drawings and an example.

Figure 1 shows a front view of the device of the present invention, in which a θ rotation shaft (3) that rotates with a different momentum is provided on the upper part of the sewing machine body (6) at the same position as the center position of the sewing machine needle, and is driven. D
C motor--pulse motor-1 or servo motor, etc.
It is connected directly or indirectly via gears, belts, etc. to the θ drive unit (4), which is powered by power that performs precise rotational motion at high speed and high output. In Figure 1, the θ drive section (4) is installed on the upper part of the sewing machine and fixed by the θ drive fixing frame (5). The θ rotation shaft (3) is connected to the sewing feeder (1) via a lightweight and strong connecting arm (7) made of metal, synthetic resin, or composite material. Therefore, the sewing feeder (1) is connected to the θ rotation axis (3).
It rotates by θ around the axis. The sewing feeder (1) is made of metal, synthetic resin, or a composite material, has a flat side profile, and has an appropriately fine file-like surface and rubber on the back side, that is, the surface in contact with the object to be sewn (8). board, uneven surface,)
It has a cut surface, etc., and has an appropriate anti-slip effect and holding power on the sewing object depending on the type and texture of the sewing object.

The second figure shows a plan view, in which a pocket cloth as an example of the object to be sewn (8) is placed on a sewing machine table in a position to be sewn, and the sewing feeder (1) is placed on the aforementioned pocket cloth. An appropriate pressure equivalent to the weight of the sewing feeder (1) is applied to the workpiece (8). The pressure can be adjusted depending on the type of the object to be sewn (8), and wrinkles and sagging of the object to be sewn can be prevented. The sewing feeder 9 (1) is composed of a single or a plurality of sewing feeders, and can be changed to a single sewing feeder (1) or a plurality of sewing feeders depending on the size of the sewing object (8) and the range of rotational movement.

For example, in the case of a pocket, the dimensions are relatively thick (,180
Since it is necessary to rotate the sewing feeder (1) by 90 degrees as shown in Figure 2. The position of the pocket cloth and the sewing feeder (1) after finishing sewing the curved portion is shown in the plan view of Figure 3. In other words, during sewing, the pocket fabric slips out from the first sewing feeder (1) due to slight deviations due to the feed movement of the presser foot and feed dog of the sewing machine.
The pocket fabric is pressed by the second sewing feeder (1).

In the diagram, are the two sewing feeders (1) shifted 90 degrees? However, the position of the sewing feeder (1) and the spread of the angle are shifted, and two or more pieces are provided, or the sewing feeder (1) is approximately semicircular or fan-shaped with a spread of 180 degrees, or Either method can be used, such as pressing the entire surface with a donut mold or the like, or pressing in a circular shape with a 360 degree angle. Furthermore, the sewing feeder is not necessarily limited to being flat and having a certain area or more. For example, the area of contact with the sewing material can be made into a small comb like a rake, or one side shaped like a dot, a thin strip, a thin fan, or a donut. The part to be joined to the sewing product can be joined not in a plane but in a dotted or linear shape.

Figure 4 shows that the sewing feeder (1) automatically moves up and down.
If the shape of the object to be sewn is a straight line, it goes up, enters the two curved parts, and sews down.

FIG. 2 is a front view of an embodiment having the feature that it is possible to press the workpiece, carry the workpiece onto the sewing surface of the lamination machine, and automatically take it out. The upper part of the connecting arm (7) connected to the sewing feeder (1) has a vertical drive section αυ made of an air cylinder or an electromagnet, etc., and by vertically moving this, the sewing feeder (1) is automatically moved. It can be raised and lowered. For example, if the shape to be sewn is a straight line,
The θ rotation is no longer necessary, and during this time the sewing feeder can leave the presser foot on the workpiece and can start pressing again on the curved section. Further, by vertically moving the sewing feeder (1), it is possible to easily insert and remove the sewing material. The movement of the θ rotation accurately moves the sewing feeder (
1), there are a plurality of connecting arms (7), one of which is attached to the vertical drive unit 0υ, and the other is used as a guide pole to prevent the sewing feeder (1) from cuffing. The θ rotation axis (3) in FIG. 4 transmits the rotational motion of the θ drive unit (4) via a drive belt α7Jt such as a timing belt, a belt, or a chain. By the method described above, θ
Since the installation location of the drive unit (4) can be selected at any location and the size of the θ drive unit (4) is not limited, it is possible to install multiple θ drive units and use highly accurate power with large output. be. FIG. 7 is a front view of a specific example having a sewing feeder (1) and a constant feeder (c).

In normal rotational movement, the connecting arm (7) is connected to the sewing machine body (6).
However, the above-mentioned method of the present invention has a limit of rotation of about 300 degrees. It is extremely rare for a normal sewing item to have a sewing line that requires rotation of 300 degrees or more, but for example, when sewing a circular cushion, rotation of about 360 degrees is required.

Figure 7 shows a method to deal with this, and shows two types of θ
A drive unit is provided, and the sewing feeder is controlled to return to its original position after rotating 180 degrees by the first θ drive unit (4).
The continuous feeder (c) is rotated by another second θ drive unit, and after performing appropriate rotation such as 90 degrees or 180 degrees, the continuous feeder (2) is placed directly on the workpiece and the connecting arm (
7) rises up, moves away from the constant feeder (c), returns to the original rotation start position again 9, lowers the connecting arm (7), and the next position exchange receiver is integrated with part (c), and the θ drive This is to constantly transmit the rotational movement of the part to the sender (c).

FIG. 8 shows a plan view of the sewing feeder (1) and the constant feeder (c), and the sewing feeder (1) is fixed by the connecting arm (7) every 909 times. The regular sender Q3 is
It has a donut-shaped position centering on the needle position, and a position exchange part (c) is provided every 90 degrees, and the connecting arm (7) can be attached and detached by magnetic force, locking, or engagement method, and the position can be changed every 90 degrees. The connecting arm of the exchange receiver is detached from part (C), the connecting arm (7) returns to the rotation starting position, and the exchange receiver in the next position is connected to part (C) and performs rotational movement. Therefore, since the workpiece to be sewn is always held down by the feeder (to), the connecting arm (to)
) returns to the original rotation start position, the sewing object remains in position and can be sewn accurately and continuously.

For the purpose of moving the sewing feeder (1) and the constant feeder (c) more accurately, the connecting arm is branched, and the branched connecting arm is moved on a guide rail or a groove for a rotational movement track is formed, A protrusion is formed on the sewing feeder or the regular feeder ball, and by engaging the two, it is possible to move accurately on the track.

The present invention has the above-mentioned structure, and moves the object to be sewn onto the sewing line of the insignia according to the following principle. That is, by moving the sewing machine needle fixed position shown by the dotted line that forms the entire sewing line to be sewn in Figure 5 (A) to the sewing machine needle position 0 country, the sewing line of the curve to be sewn is formed. It is something. The direction of movement of the presser foot and feed dog of the sewing machine, that is, the direction of movement of the sewing machine, is vertical, as shown by the arrow. If the seam indicated by the solid line is formed and then sewn as is, the next seam will be formed below the extension of the previous seam line. With this, you can sew straight lines, but you cannot sew curved lines. Figure 5 (I3) shows θ which requires movement or rotation in order to form a curved sewing line at a certain seam allowance from the outer shape of the sewn product having the curved shape shown in the figure.
It indicates a corner. (When the previous stitch is completed during cutting, the needle position 0 is at the last position of the stitch, and the next needle position will be set when the feed dog and presser foot hold the material to be sewn, unless an external force is applied.) Since the feeding direction is straight, it is a vertical position one stitch below needle position 0, that is, the needle position shown by the dotted line.Make sure this needle position matches the needle position that forms the sewing line to be sewn. By successively matching the needle position with the next fixed position of the needle, the sewing line to be sewn is formed. Φ) In the figure, by rotating the θ angle α barrel around the current needle position, In other words, it is possible to match the needle position 1 (c) with the next needle position. According to another explanation, the tangent to the curve at the needle home position 1 in FIG. 5 (4) is the tangent to the needle home position 1, IQ! 9. Needle fixed position 2 (
The tangent line (l [9) to the sewing machine's fixed position 3 (1) is shown as the tangent line αη to the needle fixed position 3 (1). On the other hand, movement in the Y direction, that is, the vertical direction, can be performed by using the feed dog and presser foot feed device of a normal sewing machine. In the present invention, the movement in the Y direction is left to the feeding device of the normal sewing machine described above, and then the needle is moved by θ rotation to the position where the needle is fed by one stitch in the Y direction. It is something that takes the position into account.

FIG. 6 shows an explanatory diagram of the above-mentioned rotational motion total synthesis, and 0
8 is the angular difference between the tangent a to the needle fixed position 1 (221) and the vertical direction, that is, unless this angle is moved, the sewing machine advancing direction and the tangent to the next needle fixed position will not match;
Similarly, aI indicates the angular difference between the tangent Q61 to the needle fixed position 2 (2a) and the tangent 09 mentioned above, and (a) is the tangent aη
and the tangent line (which indicates the angular difference with IF5. Therefore,
When the needle fixed position 1 is at the position shown in FIG. 5 (5), the rotational drive of the tangent 1 is performed by the movement angle a8, and then the needle fixed position 1 is moved to the needle position a, At the time when the stitch is formed, the needle regular position 2 shifts to the needle regular position 1 in front of the flap, although the tangential angle is different. At this point, the rotational drive of the moving angle wire on the tangent line 2 is performed. Similarly, at the next point in time, the rotational drive of the tangent line 3 by the moving angle (a) is performed. For example, a sewing line that forms an angle with 30 stitches, i.e. 9
When rotating by 0 degrees, the corner sewing line is formed by rotating the needle by an average of 3 degrees for each needle. In the case of a sewing line that is bent at a right angle, the sewing line is formed at a right angle by rotating the needle 900 degrees.

The present invention - controls the degree of drive rotation, needle movement speed, and vertical movement of the sewing feeder for each needle, automatically harmonizes the movements of both the feed device and the rotational drive of the sewing machine, and adjusts the sewing line of the insignia. It is something that forms. For example, in the case of the pocket cloth in Figure 3, a total of 90 degrees of rotation is completed at the gentle curved portion, and then it is necessary to perform approximately 90 degrees of rotation. At this point, the needle movement speed is reduced, and after rotating approximately 90 degrees, the presser foot of the sewing feeder is released in order to enter a straight sewing line.

All sewing operations can be performed automatically by controlling in advance a program that changes to the maximum needle movement speed, stops after sewing a specified number of stitches, and cuts the thread.

14- In addition to using a preset control method such as a program, the present invention uses a sensor such as an image sensor or a fiber class sensor to feed back information for confirming the shape and position of the object to be sewn to the control device. It is also possible to immediately sew any shape by performing appropriate rotational drive while checking the shape position of the object to be sewn. Currently available so-called edge control seamer sewing machines are equipped with a sensor that detects the position of the edge of the workpiece, and when there is insufficient edge or seam allowance, the workpiece is moved by the rotational movement of a small roller. By combining the present invention with an edge controller device configured to pull in the seam allowance in the X direction (horizontal direction) and push it out in the X direction if the seam allowance is too thick, it is possible to sew curves with extremely small radii at high speed and accurately. can. In order to make effective use of the sewing machine's feed device, by performing control that alternates or almost alternates the movement of advancing the sewing machine with the rotational driving movement, it is possible to perform more reliable and accurate sewing, especially for short stitches. By appropriately operating only the portions that are driven at large rotation angles during the number of rotations, accurate sewing can be performed without causing pucker links. The sewing feeder (1) is not limited to being on the sewing machine table, but may be provided below the object to be sewn, that is, below the surface of the sewing machine table.

The vertical movement of the sewing feeder (1) is also synchronized with the movement of the feed dog of the sewing machine, and when the workpiece is advanced by the feed dog in the Y direction, the sewing feeder (1) releases the presser foot of the workpiece. death,
By performing synchronization or pseudo-synchronization of pressing at the point of θ movement, soft and stretchable fabric can be sewn accurately without wrinkles.

The present invention has the above configuration and has the following features.

1) Conventional automatic sewing methods (e.g., pattern seamer) always require a mold for the presser foot that has a groove cut out for the sewing line, which takes time to create the mold, and does not allow immediate and easy sewing. Although it was not possible to change the shape of the line, the present invention does not require a mold, so the shape to be sewn can be changed instantly and easily, and the time to align the sewing line to the groove and the time to open and close the mold can be saved. This makes it possible to increase the net sewing time and is efficient.

2) Conventional automatic sewing (for example, edge control seamer) can sew shapes with gentle curves, but cannot sew shapes with small radii, for example, 15 cm or less. In contrast, the present invention can automatically sew extremely fine and sharp curves.

3) Conventional devices that move fabric like sewing feeders are:
There is no versatility at all. In other words, for cufflinks, only cufflinks can be sewn. That is, the rotation axis of the conventional sewing feeder is not the center of the sewing machine needle, but the rotation axis is a pseudo center point of the curved shape of the object to be sewn. Therefore, if the shape changes, it is necessary to newly set the rotating circle diameter and the position of the axis, and one device is used to sew one shape, moreover, a similar shape, and not to sew other shapes. It cannot be single-purpose sewing. On the other hand, the present invention is characterized by extremely high versatility in that it can be sewn into any shape.

4) Since the feed device of the sewing machine can be used, thread tightness is good and it can be used for decorative stitches that appear on the surface of clothing.

5) The device of the present invention has the feature that it can be easily installed in a conventional sewing machine and can automate the sewing machine without purchasing a new sewing machine.

[Brief explanation of drawings]

Figure 1 Front view Figure 2 Plan view (at the start of movement) Figure 3 Plan view (during movement) Figure 4 Front view (second embodiment) Figure 5 Enlarged explanatory diagram of θ movement A) Explanation of tangents to the needle position Fig. 18-B) Illustration of movement due to θ rotation Fig. 6 Illustration of composition of θ rotation angle Fig. 7 Front view (third embodiment) Fig. 8 Plan view of sewing feeder and regular feeder 1, sewing feed 9
Hand 2, sewing machine needle 30 rotating shaft 4, θ drive unit 5, 0 drive fixed frame 6, sewing machine body 7, connecting arm 8, workpiece 9, sewing machine table 10, stitch 11, vertical drive unit 12, drive belt 13, needle position 14, Sewing machine advancing direction 15, tangent 116 to the needle in normal position (1), tangent 217 to the needle in normal position (2), tangent 318 to the needle in normal position (3) Movement angle of tangent 1 = θ angle 19 Movement angle of tangent 2 20. Pocket cloth movement position 22 due to the movement angle of tangent 3 2118, needle fixed position 1 23 Continuous feed 9 hands 24 needle fixed position 2 25. Position exchange receiver part 26 needle fixed position 3 Utility model registration applicant Marvelt Associates Co., Ltd.

Claims (1)

[Scope of Claims] ■) A sewing feeder that has the weight and area to press the workpiece on the sewing surface of the sewing machine and rotates around the center position or approximately the center position of the sewing machine needle; It has a control for rotating the sewing feeder 9 hand to an appropriate θ angle, and a θ drive mechanism consisting of a drive device, and the workpiece is sandwiched between the sewing feeder and the sewing surface of the sewing machine. A sewing device that controls and drives the θ drive mechanism so that a recognized sewing shape is formed. 2) The sewing device according to claim (1), wherein the sewing feeder applies appropriate pressure onto the object to be sewn. 3) The scope of the patent claims characterized in that the sewing feeder freely performs any of the operations 1- to press or release the pressure on the object to be sewn, depending on the shape of the sewing line to be sewn on the object to be sewn. The sewing device described in (1). 4) Operation of the sewing feeder to press and release the workpiece is synchronized or pseudo-synchronized with the movement of the feed dog of the lamination machine, and while the workpiece is moved in the sewing machine advancing direction (Y direction) by the feed dog, the workpiece is not sewn. A sewing device according to claim (1), characterized in that the sewing device performs an operation of releasing or loosening a presser foot on an object. 5) Information on the shape and position of the workpiece detected and confirmed by the sensor is fed back to the control device, and based on the fed back information, the θ drive mechanism is controlled and the shape and position of the workpiece are detected in real time. The sewing device according to claim (1), characterized in that sewing is performed simultaneously while detecting and confirming.