JP2017131619A - Bird's nest prevention device for flat sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bird's nest prevention device for a flat sewing machine.SOLUTION: A bird's nest prevention device for a flat sewing machine according to the present invention includes a presser and a presser crank pivotally attached to the presser. An air suction tube and a thread hook are disposed in a hole of the presser crank. The tail part of the thread hook is inserted in a thread hook connection plate. The upper part of the presser crank is pivotally attached to one end of a connection rod. The other end of the connection rod is pivotally attached to the thread hook connection plate. The presser crank is fixed to a cylinder body of an air pressure cylinder. A piston rod of the air pressure cylinder is pivotally attached to the middle part of the connection rod. A round cutter is disposed within a shallow groove in the middle part of the presser. Between two presser feet of the presser, there is disposed a slit into which a sewing thread can be inserted. The peripheral blade part of the round cutter covers part of the slit. Between a thread leading end and the blade part of the round cutter, the thread leading end can be cut only by the application of extremely small acting force. A thread hook unit is disposed in the presser crank, so that the deformation of the thread hook unit is prevented, the use of the whole device is ensured, and the occurrence of a relatively large loss of human property can be avoided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to the field of sewing machines, and more particularly to a bird's nest prevention apparatus used for a flat sewing machine.

  When a general flat sewing machine starts sewing, the thread starts to be sewn on the presser foot surface, and the thread duck phenomenon in which the lower thread appears at the head is called “bird's nest”. Current computer thread trimming machines are used for two types of applications where sewing threads are used, stitches are formed on the sewing fabric, single or multi-layered sewing fabrics are woven or stitched together, and usually thin and hot fabrics are sewn. Divided. Computer thread trimming flat stitch function is used to sew fabrics such as hemp, silk, artificial fibers and leather, plastic, paper, etc., and thin cloth is generally used for knitting underwear, shirts, uniforms, etc. Cloth is generally used for various athletic clothes, denim, fashionable clothes, coats, leather hats, bags, etc., and the computer thread trimming flat sewing machine is the most basic model in the sewing machine, but at the start of sewing the existing flat sewing machine, A bird's nest phenomenon easily occurs in the lower thread, affecting the quality of the product and lowering the yield.

  The public number is CN10491118A, China's patented invention, discloses a sewing machine bird nest removal device and method of use. The bird nest removal device includes a hook, a thread clamp plate, a sewing needle and a presser located below the machine head. Including the foot, the hook connects the rotary shaft and the machine head to provide a needle hole for passing the sewing thread on the sewing needle, the presser foot is located on the needle plate, and the thread passing corresponding to the sewing needle in the presser foot A groove is provided, the thread passing groove extends along the moving direction of the sewing cloth, and a cutter is provided at the bottom of the thread passing groove. The sewing machine employs a circular vibration thread hook thread pinching device, and after the thread is cut, the thread tip is pinched, and when sewing starts next, the thread of the two thread grippers is pinched and the thread is loosened at the start of sewing. In order to provide a sufficiently stable thread amount, the upper thread is quickly tightened in a situation where there is no lower thread, and the tip of the pinched thread is cut at a position near the needle hole of the sewing cloth, and the remaining thread end It is short and solves the problem of bird's nest thread tip.

  The public number is CN20418562U, a Chinese utility model has released a bird's nest prevention device for computer thread trimming flat sewing machine, and a bird's nest prevention device is attached on the sewing machine body, Includes iron, thread hook device and high and low presser foot. The high and low presser foot includes a presser foot head, and the bottom of the presser foot is attached to the bottom of the presser foot and the side of the foot. The upper part of the presser foot is provided with two independent square pillars and the mounting grooves are provided inside the two square pillars. An elastic member is installed in the mounting groove, and a cutter mounting groove is provided on both the inner side of the pressing foot and the inner side of the pressing foot. Attach the upper and lower presser foot, thread hook device and thread loosening electromagnetic iron on the existing computer thread trimming flat sewing machine. At the end of sewing, the thread hook device hooks the upper thread, and the thread loosening electromagnetic iron holds the upper thread. When loosening once and then starting sewing, the upper thread pinched by the thread hook device begins to sew in the vestibule that the line is held on the line, the sewing needle penetrates the cloth, and the upper thread pinched by the thread hook device is It can be cut with a high and low presser foot cutter to achieve no bird's nest, and at the same time, the yarn removal process can be omitted.

  The above-mentioned two exclusive thread-cutting cutters are both rectangular, and the operation between the cutter and the tip of the thread is not "breaking" but "cutting", and between the tip of the thread and the blade of the cutter. A relatively large working force is required, and finally the thread tip can be cut, and the blade portion of this type of cutter is straight, the range is 0 to 180 ° C., and after the blade portion becomes dull, a new cutter There is no choice but to replace it. In addition, the thread hook device is installed to be exposed to the outside, and generates a hook with the surrounding environment such as the thread tip, cloth, and human body in the work process, thereby causing deformation of the thread hook device and It can affect use and even cause relatively large loss of property.

CN20418562U

  In order to solve the above problems existing in the existing technology, the object of the present invention is to utilize the fact that the blade portion of the round cutter has a circumference of 360 °, and to provide a minimal working force between the yarn tip and the round cutter. It is possible to cut the thread tip just by having it, and the round cutter can be used more permanently, and the thread hook device is installed in the holding handle to prevent deformation of the thread hook device and ensure the use of the entire device It is another object of the present invention to provide a flat sewing machine bird nest prevention apparatus that can avoid causing a relatively large loss of human property.

  In order to achieve the above object, the flat sewing machine bird's nest prevention device of the present invention includes a presser handle pivotally attached to the presser and presser, and the presser handle has a hole, and an intake pipe and a thread hook are installed in the hole. The tail portion of the thread hook is inserted and connected to the thread hook connection plate, the upper part of the presser handle is pivotally attached to one end of the connection rod, and the other end of the connection rod is pivotally attached to the thread hook connection plate. The handle is fixedly connected to the cylinder body of the pneumatic cylinder, the piston rod of the pneumatic cylinder is pivotally attached to the middle of the connecting rod, a shallow groove is provided in the middle of the presser, and a round cutter is installed in the shallow groove, A slit into which a sewing thread can be inserted is provided between the two presser feet of the presser, and a peripheral edge portion of the round cutter covers a part of the slit.

  In the flat sewing machine bird's nest prevention apparatus, a thread hook retainer is installed in the hole of the retainer handle, and the thread hook retainer forms a guiding action with respect to the thread hook.

  In the flat sewing machine bird nest prevention apparatus, a presser spring is installed between the presser and the presser handle, and the presser spring forms a positioning action with respect to the round cutter.

  The beneficial effect of the present invention is the action of “breaking” instead of “cutting” between the round cutter and the thread tip, with the blade portion of the round cutter having a circumference of 360 °. Only a very small force is required between the blade parts, and the tip of the thread can be cut. In addition, the round cutter can rotate and adjust the position in the course of use. However, it only causes local wear, has a long service life, and can be used permanently. Further, the thread hook device is installed in the presser handle, and it is difficult for hooks to be generated in the surrounding environment such as the thread tip, cloth, and human body during the work process. In particular, when sewing a thick cloth, the existing thread hook device is required to stop the cloth, sew a thin cloth, particularly a silk cloth, and sew a lace etc. It gets in the way. However, the present invention currently installs a thread hook device attached around the presser foot in the presser handle, effectively solving the above problems, thereby preventing deformation of the thread hook device and using the entire device. And avoid causing a relatively large loss of personal property.

It is a three-dimensional external view of the bird's nest prevention device for a flat sewing machine of the present invention. It is the three-dimensional exploded view of the partial structure of the bird's nest prevention device of the flat sewing machine of the present invention. It is structural explanatory drawing of the holding | suppressing of the bird's nest prevention apparatus of the flat sewing machine of this invention, and a round cutter.

First, referring to FIG. 1 to FIG. 3, the flat sewing machine bird nest prevention device of the present invention includes a presser 1 and a presser handle 2 pivotally attached to the presser 1.
The presser handle 2 is provided with a hole 21, an intake pipe 3 used for sucking out yarn waste and a thread hook 4 of a thread hook device are installed in the hole 21, and a fitting groove 42 is formed in the tail part of the thread hook 4. The thread hook connection plate 5 is inserted and connected by the fitting groove 42;
A thread hook retainer 41 is installed in the hole 21 of the retainer handle 2, and the thread hook retainer 41 forms a guiding action with respect to the thread hook 4.
The upper part of the presser handle 2 is pivotally attached to one end 61 of the connecting rod, and the other end 62 of the connecting rod is pivotally attached to the thread hook connecting plate 5;
The presser handle 2 is fixedly connected to the cylinder body 72 of the pneumatic cylinder 7 and is pivotally connected to the piston rod 71 and the middle portion 63 of the connecting rod 6 of the pneumatic cylinder 7, and the connecting rod 6 and the thread hook connecting plate are connected by the piston rod 71. 5 and the movement displacement of the thread hook 4 are interlocked,
A shallow groove 12 is provided in the presser 1, a round cutter 8 is installed in the shallow groove 12, and a presser spring 81 is installed between the presser 1 and the presser handle 2. 8 forms a positioning action,
A slit 11 into which a sewing thread can be inserted is provided between the two presser feet 14 of the presser 1, and the peripheral edge portion of the round cutter covers a part of the slit 11.

Thereby, in the flat sewing machine bird's nest prevention device of the present invention, the peripheral blade portion of the round cutter 8 covers a part of the slit 11 of the presser 1, the round cutter 8 itself has a circular shape, and the blade portion is 360. ° It has a circumference and the operation between the round cutter 8 and the end of the thread is not “cut” but “breaking”. Therefore, there is only a minimal force between the end of the thread and the blade of the round cutter 8. Therefore, the round cutter 8 can be rotationally adjusted in the course of use, and therefore the circumference of the blade only causes local wear and has a service life. Long, and can be used permanently. Further, the thread hook device is installed in the presser handle 2, and it is difficult for hooks to be generated in the surrounding environment such as the thread tip, cloth, and human body during the work process. In particular, when sewing a thick cloth, the existing thread hook device is required to stop the cloth, sew a thin cloth, particularly a silk cloth, and sew a lace etc. It gets in the way. However, according to the present invention, a thread hook device attached around the presser foot is currently installed in the presser handle 2 to effectively solve the above problems, thereby preventing deformation of the thread hook device and The use can be ensured and the loss of relatively large personal property can be avoided.

  In the present invention, the preferred embodiments have been disclosed as described above, but these are not intended to limit the present invention in any way, and anyone who is familiar with the technology can make an equivalent scope without departing from the spirit and scope of the present invention. Of course, various fluctuations and hydration colors can be added.

1 Presser 11 Slit 12 Shallow Groove 14 Presser Foot 2 Presser Handle 21 Hole 3 Suction Pipe 4 Thread Hook 41 Thread Hook Presser 42 Fitting Groove 5 Thread Hook Connection Plate 6 Connecting Rod 61 One End 62 Other End 63 Middle 7 Pressure Cylinder 71 Piston Rod 8 Round cutter 81 Holding spring

Claims (3)

  The presser handle includes a presser handle pivotally attached to the presser, the presser handle has a hole, an intake pipe and a thread hook are installed in the hole, and the tail portion of the thread hook is inserted and connected to the thread hook connection plate. The upper part of the handle is pivotally attached to one end of the connecting rod, the other end of the connecting rod is pivotally attached to the thread hook connecting plate, and the holding handle is fixedly connected to the cylinder body of the pneumatic cylinder, and the piston rod of the pneumatic cylinder Is pivotally attached to the middle of the connecting rod, a shallow groove is provided in the middle of the presser, a round cutter is installed in the shallow groove, and a slit is inserted between the two presser feet of the presser so that a sewing thread can be inserted. A flat sewing machine bird's nest prevention apparatus, characterized in that the peripheral edge of the round cutter covers a part of the slit.   2. The flat sewing machine bird nest prevention apparatus according to claim 1, wherein a thread hook retainer is installed in a hole of the retainer handle, and the thread hook retainer forms a guiding action with respect to the thread hook.   The flat sewing machine bird's nest prevention device according to claim 1, wherein a presser spring is installed between the presser and the presser handle, and the presser spring forms a positioning action with respect to the round cutter.

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