JPS604300B2 - Presser foot device for embroidery sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a embroidery sewing machine that works in cooperation with a feed plate that is driven to transport the vicinity of the needle of the fabric to be embroidered to move the vicinity of the needle of the fabric. The object of the present invention is to provide a presser foot device for a embroidery sewing machine that can improve the accuracy of transferring the fabric by smoothing each operation for repeatedly transferring the fabric.

Next, one embodiment of the present invention will be described with reference to the drawings. First, the fabric transfer mechanism will be explained according to Fig. 1. In the figure, the fabric to be stitched 1G is stretched and horizontally transferred in synchronization with the vertical movement of the sewing needle (not shown) in the positioning layer. The base frame is a rectangular base frame that is horizontally movable on the table T of the sewing machine, and is driven and controlled by a first drive motor 2 disposed near the right rear end of the table T. The belt 3 and a vertical belt 5 whose drive is controlled by a second drive motor 4 disposed on the left side of the first turbulence motor 2 are connected to each other via connecting pieces 6 to 6 so as to be able to move together. The first and second wheels are numerically controlled and rotationally driven based on X and Y signals transmitted by a command device (not shown).
When the drive motors 2 and 4 rotate, they move in the x-axis and y-axis directions of a plane orthogonal coordinate system defined with the axis ○ of the sewing needle on the table as the origin, and the fabric moves in both directions. The amount is transferred in the direction of synthesis.

Reference numeral 7 denotes a feed plate laminated so as to be horizontally movable on the upper surface of the sewing base 8 attached to the table T facing the sewing needle in order to form stitches in cooperation with the sewing needle. A transverse belt 10 is attached to the lower surface of the belt and is driven and controlled by a third drive motor 9 disposed close to the first drive motor 2, and a fourth drive motor 1 disposed close to the second drive motor 4. The vertical conveying belt 12, which is driven and controlled by the controller, is movably connected to the vertical conveying belt 12 through connecting plates 13 to 13, respectively, and is numerically controlled and rotationally driven by the X and Y signals from the command device. 3. When the fourth drive motors 9 and 11 rotate to transfer the fabric, the feed plate 7 moves the base frame in the direction of the composite of the amount of movement in the x-axis and y-axis directions on the table T corresponding to the x and Y signals. 1
Move in sync with. On the other hand, after the fabric is transferred, the
-x, -Y signal of the command device which inverted the Y signal
When the fourth drive motors 9 and 11 are driven in reverse, the feed plate? is returned to the original position from the moved position.

Next, the presser foot mechanism will be explained according to FIGS. 2 to 4. Reference numeral 14 denotes a lifting rod that is movable up and down relative to the upper and lower weaving parts of the support bracket 15 attached to the sewing machine head (not shown). A linking pin 16 is horizontally fixed near the center of the linking pin 16, and upper and lower support pieces 17A and 17B are extended horizontally in the opposite direction to the linking pin 16 above and below the linking pin 16, respectively. It is attached.

Reference numeral 18 denotes a swinging arm Z which is pivotably pinned to face the lifting arm 14 for the sewing machine head, and is mounted on a sewing machine main shaft 19 which is constantly rotated to drive sewing needles, etc. The cam 201 is swung together, and when the swiveling arm 18 is swung, the elevating arm 1 is moved through the linking pin 19.
4 is moved up and down by extending and contracting a spring 21 mounted on the upper part of the lifting rod 14.

Reference numeral 22 denotes a universal joint installed perpendicularly between the upper and lower support pieces 17A and 17B, in which the upper piece 22a and the lower piece 22b are connected via pins 23 and 23 so that they can be moved in any direction. The upper two ends of the upper piece 22a are fixed to the upper support piece 17A, while the lower end of the lower piece 22b is connected to the through hole 24 provided in the lower support piece 17B. 22
It is inserted like a free iron to allow the movement of b.

Reference numeral 25 denotes an elastic member 3 connected to the lower end of the lower piece 22b of the universal joint 22. In this example, a coil spring is used, and when the lower end of the elastic member 25 is displaced in the horizontal direction and released, It elastically returns to a vertical position and is held vertically. 26 is a presser foot 27 that presses against the lower end of the elastic member 25.
3, the center of the through hole 26a of this presser foot 26 passes through the through hole 26a and moves up and down. ,
The presser foot 26 is extended to the upper surface of the feed plate 7 so as to be aligned with the center line ○ of the nipple N, which is arranged so that the sewing needle can be moved up and down and rolled. When going to work in conjunction with the feed plate 7, the area around the needle base of the fabric is pressed in an encircling manner with the feed plate 7, and when the feed plate 7 moves, the elastic portion 25 is elastically deformed to follow the feed plate 7. The fabric is laid down and horizontally displaced, and the fabric is transported with the needle head area supported, while when the presser foot 26 moves upward by the lifting lever 14, the fabric is released from the clamping state and the elastic member 25 is moved. With the restoring force, it automatically returns centripetally to Fujishin line 0 and waits for the next fabric transfer.

Next, the operation and effects of the embodiment having the above configuration will be explained.

First, when the command device sends X and Y signals when the sewing needle is on duty, the first and second drive motors 2 and 4 are rotationally driven, and the base frame 1 is moved to the x and y axes corresponding to the X and Y signals. The fabric is transferred by moving in the direction in which the amount of movement is combined, and the third
The fourth drive motors 9 and 11 are driven to rotate, and the feed plate 7 similarly moves synchronously in the combining direction.

Then, with the steady rotation of the sewing machine main shaft 19, the presser foot 26, which is moved downward via the elevator 14 and pressed against the feed plate 7, is displaced following the feed plate 7, and is held between the feed plate 7 and the presser foot 26. The vicinity of the needle base of the fabric is transferred in the synthesis direction. On the other hand, when the sewing needle is placed under the sewing machine, the presser foot 26 moves up with the constant rotation of the main shaft 19 of the sewing machine to release the fabric, and the restoring force of the elastic part 26 moves the presser foot 26 from the position displaced by the transfer of the fabric to zero the center line. At the same time, the third and fourth drive motors 9 and 11 are driven in the reverse direction by the -X and -Y signals from the command device, and the feed plate 7 returns from the moving position to the original position.

For this reason, the presser foot 26 smoothly and reliably performs a complex operation of holding and transporting the vicinity of the needle of the fabric, and a compound operation of releasing and returning the fabric, and repeats the fabric. The transfer accuracy during transfer can be significantly improved.

That is, the present invention removes pressure from the vicinity of the needle base of the fabric between the feed plate, which is placed horizontally so that it can be horizontally moved in any direction centering on the needle base and can return to the bride position, and then transports the fabric in any direction. In addition, in order to release the fabric after the fabric is transferred, a fabric presser is provided vertically movably opposite to the feed plate, and when the fabric presser moves downward, the fabric presser is horizontally displaced in any direction. A universal joint is suspended in order to allow the movement of the workpiece, and a centripetal joint is provided that can be bent in any direction with respect to the universal joint in order to automatically return the presser foot from each displacement position to its original position when the presser foot moves upward. This is an extremely excellent invention as a presser foot device for a needle stitch sewing machine because it is supported via a spring connected to allow elastic recovery, thereby making it possible to accurately transfer the fabric to the vicinity of the needle head and improve the transfer accuracy. It is.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic plan view showing a fabric transfer mechanism, FIG. 2 is a side view showing a cloth presser mechanism, FIG. 3 is a front view, and FIG. The figure is ×− in Figure 3.
It is an X-ray cross-sectional view. 7... Feed plate, 26... Presser foot, T...
...Table, 0...Axis center line. Figure 1 Figure 4 Figure 2 Figure 3

Claims (1)

[Claims] 1. The fabric is transferred in any direction by pinching the fabric near the needle base between a horizontally placed feed plate that can be moved horizontally in any direction centering on the needle base and can be returned to the original position, and In order to allow the presser foot, which is vertically movable opposite the feed plate in order to release the fabric after the fabric is transferred, to allow horizontal displacement of the presser foot in any direction when the presser foot moves downward. A vertically supported universal joint and a centripetal elastic restoration that can be bent in any direction with respect to the universal joint in order to automatically return the presser foot from each displacement position to its original position when the presser foot moves upward. What is claimed is: 1. A presser foot device for a needle stitch sewing machine, characterized in that the presser foot device is supported via a spring that is possibly connected to the presser foot device.