JPS5855906Y2 - cloth feeding device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a sewing machine, and particularly to a cloth feeding device used in a sewing machine.

Sewing machines are equipped with a cloth feeding device that feeds cloth in synchronization with the vertical movement of a pot, and this cloth feeding device is an essential element for both industrial sewing machines and general household sewing machines.

By the way, in a general household sewing machine, the vertical movement speed of the sewing machine needle is slow, so the cloth feeding speed of the cloth feeding device may also be slow, but in an industrial sewing machine, the vertical movement speed of the sewing machine needle is slower than that of a general household sewing machine. Because it is extremely fast compared to the previous method, it may be necessary to add a special cloth feeding device.

Furthermore, in conventional special cloth feeding devices of this type, the rotation of the motor is transmitted to the cloth feeding roller through only one of a timing belt or gears, for example.

However, if only the timing belt is used, the mass can be made relatively small and the influence of inertia can be eliminated, but the timing belt is positioned laterally to the cloth feed roller, which deteriorates the sewing workability.

On the other hand, in order to improve sewing workability, it is possible to reduce the width of the timing belt, but from the viewpoint of durability, it is not preferable to make the width too narrow.

On the other hand, if only gears are used, the sewing workability will not be deteriorated, but the mass will be relatively large, so the rotation start and stop of the double feed reroller will have to be performed precisely as specified due to the influence of inertia. In addition, problems such as backlash occur.

The present invention has been devised in view of the above points, and its purpose is to provide a fabric feeding device that can make the mass of the rotation transmission mechanism relatively small and improve sewing workability. It is in.

Next, a preferred specific example of the present invention will be explained based on the drawings.

1 to 3, a base plate 4 having an L-shaped planar shape is fixed near the head portion 3 of a sewing machine main body 2 mounted and fixed on a base 1, and a protruding piece of the base plate 4 A guide block 6 is fixed to the end of the base plate opposite to the guide block 5, and a guide block 7 is fixed to the end of the protruding piece 5.

A plate 8 is attached to the guide block 6 via a screw 9, and a hexagonal rod 11 whose one end is connected to a bracket 10 and projects upward is provided between the plate 8 and the guide block 6. is inserted vertically movably, the other guide block 7 is formed with through holes 12 and 13 extending in the vertical direction, and a threaded portion is formed on the circumferential surface of the through hole 13. There is.

A slide rod 14 protruding upward from the bracket 10 is slidably inserted into the through hole 12, and a threaded portion 15 is formed at the upper end of the slide rod 14. A nut 16 is screwed into the slide rod 15, thereby making it possible to adjust the descending distance of the slide rod 14 and, therefore, the bracket 10 connected to the slide rod 14.

That is, by raising and lowering the screwing position of the nut 16 with respect to the slide rod 14, the base 1 of the double feed reroller 17 is moved up and down.
It becomes possible to adjust the height from the base 1, and it becomes possible to provide a slight gap between the double feed reroller 17 and the base 1 so that they do not come into contact when there is no cloth.

A cylindrical member 19 having a bored portion 18 and a threaded portion on its outer circumferential surface is screwed into the through hole 13, and a spring 20 is positioned within the bored portion 18, so that compression of the spring 20, The extension can be adjusted by rotating the cylindrical member 19, and the lower end of the spring 20 presses the bracket 10 downward.

A guide rod 21 is inserted into the inner hollow part of the spring 20 to prevent the spring 20 from wobbling.

The bracket 10 has a horizontal plate 22 and a horizontal plate 2.
The lower ends of the rods 11 and slide rods 14 are inserted into the through holes provided in the horizontal plate 22, and the lower ends of the rods 11 and slide rods 14 are inserted into the through holes provided in the horizontal plates 22, and are tightened by nuts 24. The vertical plate 23 has a screw 26 inserted into the elongated hole 25. screw 2
The step motor 28 is fixed by a nut 27 etc. screwed into the rotary shaft 2 of the step motor 28.
9 protrudes from the vertical plate 23, and a rotating shaft 29
A pulley 30 is fixed to the.

An arm 31 integrally extends from the vertical plate 23 in a downward direction of approximately 45 degrees, and a cover 32 integrally extends from the lower edge of the arm 31 so as to cover the pulley 33 and gear 34 from below. has been done.

A pulley 33 disposed closer to the cloth speed reroller 17 than the pulley 30 is rotatably attached to a shaft 35, and one end of the shaft 35 is supported by an arm 31 and a cover 32, respectively.

A belt, preferably a timing belt 36, is stretched between the boots 1130 and 33, and a gear 37 fixed to one end surface of the pulley 33 on the arm 31 side is meshed with the gear 34. is rotatably supported by the arm 31 via a shaft 38 in a cantilever manner.

A double feed reroller 17 is rotatably attached to a shaft 39 whose one end is supported by an arm 31 and a cover 32, respectively, and a gear 40 fixed to one end surface of the double feed reroller 17 on the arm 31 side is a gear. 34, and as a result, the rotational force of the rotating shaft 29 of the step motor 28 is transferred from the pulley 30 via the timing belt 36 to the pulley 3.
3 and the rotational force transmitted to the pulley 33 rotates the cloth feed roller 17 via gears 37, 34 and 40 as a gear train.

In this way, the gear 37 at the start end of the gear train provided between the pulley 33 and the double feed reroller 17 is rotated by the pulley 33, and the gear 40 at the end rotates the double feed reroller 17.

Incidentally, by loosening the screw 26 and adjusting the mounting position of the step motor 28 to the vertical plate 23 up and down, a predetermined tension can be applied to the timing belt 36.

A pulley 41 is provided on the side of the main body 2, and a belt 4 transmits rotational force from another drive device to the pulley 41.
When the repulley 41 in the movement of 2 is rotated, the pulley 41
The main shaft of the sewing machine fixed to is rotated, and this rotation causes
The cloth feed operation by the feed dog 43 and the vertical movement of the sewing machine needle 44 are caused.

A cloth pressing plate 45 disposed on the feed dog 43 is connected to a rod 47 extending from the main body 2 via a pressing plate holder 46, and the band lifter 48 rotatably attached to the main body 2 rotates. The cloth presser plate 45 is moved up and down via the rod 47 and the presser plate holder 46, and the cloth presser plate 45 is set to the lowered position, so that the cloth presser plate 45 and the feed dog 43 are attached between them. sandwich the cloth.

Feed dog 43. The mechanism for operating the needle 44 and the mechanism for vertical movement of the rod 47 by the band lifter 48 are well known and will not be described here.

One end of a lever 49 is fixed to the cover 32,
The other end of the lever 49 is located in a recess 50 in the connecting portion between the presser plate holder 46 and the rod 47, and when the cloth presser plate 45 is raised, one end of the lever 49 and the presser plate holder 46 are engaged. In order to do this, the lever 49 is raised, and the cover 32 and, therefore, the double feed reroller 17 located near the feed dog 43 are lifted further away from the base 1, and the space between the double feed reroller 17 and the base 1 is lifted. The clamped state of the attached cloth is released.

A generator 51 that generates a series of electrical pulses in synchronization with the rotation of the sewing machine main shaft is provided adjacent to the pulley 41;
The pulses from the generator 51 are sent to the step motor drive 52.
The driving device 52 rotates the step motor 28 based on the supplied pulses.

In a sewing machine having a cloth feeding device configured in this way,
When the belt 42 is run, the pulley 41 is rotated, and the main shaft of the sewing machine is rotated, the needle 44 is moved up and down, and the feed dog 43
is operated to transport the cloth in the A direction.

At the same time, the step motor 28 is actuated by the drive device 52, the rotating shaft 29 is rotated, and this rotation causes the pulley 3
0 is rotated, the timing belt 36 is run, and the pulley 33 is rotated.

The rotation of the pulley 33 is transmitted to the double feed reroller 17 via gears 37, 34 and 40, and when the double feed reroller 17 is rotated, it is transferred by the feed dog 43 and the double feed reroller 17 and the base 1 are rotated. The cloth held between is further transported in the A direction while being slightly pulled.

In this way, the cloth feed roller 17 cooperates with the feed dog 43 to convey the cloth.

By the way, the rotation of the rotating shaft 29 of the step motor 28 is as follows.
At a position near the double feed reroller 17, the gear 37.
34 and 40, while the double feed reroller 17
Since the transmission is carried out by the timing belt 36 at a position away from the cloth feeding device, the width of the cloth feeding device near the double feed reroller 17 can be made substantially equal to the width of the double feed reroller 17, while reducing inertia, backlash, etc. It is possible to reduce undesirable operation due to

Therefore, sewing workability can be greatly improved, cloth can be fed accurately, and the quality of sewn products can be improved.

In addition, since the cover 32 is provided, it is possible to prevent the transported cloth from being caught in the gears 37, 34 and 40, the timing belt 36, etc., thereby further improving the sewing efficiency.

In the above specific example, the gear train was composed of three gears, but the present invention is not necessarily limited to this, and may be composed of two or four or more gears. It is not limited to a step motor, but may be any other DC motor.

As described above, according to the present invention, the width of the cloth feeding device at the cloth feeding portion can be substantially reduced to the medium width of the double feed reroller, making the sewing work easier and eliminating the risk of the cloth getting caught in overhanging areas. In addition, the effects of inertia and backlash can be almost eliminated, and accurate cloth feeding can be performed.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a sewing machine to which a preferred embodiment of the present invention is applied, FIG. 2 is an explanatory diagram of the double feed reroller, etc. shown in FIG. 1, and FIG. 3 is an explanatory diagram of the double feed reroller, etc. shown in FIG. 2. FIG. 2...Sewing machine body, 17...Double feed reroller, 28...Step motor, 29...
...Rotating shaft, 30, 33...Pulley, 36.
...Timing belt, 34, 37.40...
···gear.

Claims (1)

[Scope of utility model registration request] A multi-feed reroller provided near the feed dog to transport the cloth in cooperation with the feed dog, a motor attached to the sewing machine body, a first pulley fixed to the rotating shaft of this motor, and A second pulley is provided closer to the double feed reroller than the second pulley, a belt is passed between the first and second pulleys, and the gear at the starting end is moved by the second pulley. A cloth feeding device comprising a gear train disposed between a second pulley and a cloth feeding roller and meshed with each other so that the gear at the end rotates the double feeding reroller when rotated.