JP2543844Y2 - Sewing machine cutting equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine cutting device for cutting a fabric to be sewn into a predetermined shape, and more particularly to a sewing machine cutting device for cutting an appropriate curved portion.

[0002]

2. Description of the Related Art A sewing machine cutting apparatus for cutting a fabric to be sewn into a predetermined shape is configured as shown in FIG.

[0003] In Fig. 4, reference numeral A denotes a cutting device, which has a moving knife M on an upper portion thereof. The moving knife M has the same height as the mounting table 1 on which the cloth is mounted, and is configured to swing. I have.

[0004] The fabric is cut into a predetermined shape by the cutting device A, and sewing is performed by a sewing device (not shown).

FIG. 5 is a view showing the configuration of the cutting apparatus A. In the figure, reference numeral 2 denotes a motor as a knife swing means, and this motor 2 has an eccentric cam 3 on a shaft portion,
The eccentric cam 3 converts a rotational motion into a swinging motion.

Reference numeral 7 denotes a drive transmission means provided between the motor 2 and the moving knife M, for transmitting the swing of the motor 2 to the moving knife M.

The transmitting means 7 includes a rod 4 having one end engaged with the eccentric cam 3 and a moving knife M at an upper part. 4 and a moving knife support 5 which is pivotally supported.

In the cutting apparatus A having the above-described structure, the moving knife M is swung by the drive of the motor 2 as shown by the arrow, so that a predetermined cutting can be performed on the cloth.

[0009]

However, the conventional sewing machine cutting apparatus has the following problems.
As shown in FIG. 6, when the cloth W is cut in a curved shape and sewn, the curved cut portion has an unnatural shape such as a plurality of linear cuts continuous, thereby lowering the quality value. There is an inconvenience.

In order to prevent such inconvenience, a method of making the moving knife of the cutting device faster and finer can be considered.
It was not possible to carry out a large and firm drive because a proper cutting section could be obtained.

[0011]

SUMMARY OF THE INVENTION A cutting device for a sewing machine according to the present invention has been made to solve the above-mentioned conventional problems, and has a drive provided between a moving knife and a knife swinging means of the cutting device. A drive amount reducing means for changing the drive support position of the transmission means and reducing the drive amount of the drive knife, a drive means for driving the drive amount reduction means, and a drive means for driving the drive means, And a speed change means for increasing the driving speed to solve the above-mentioned conventional problems.

[0012]

The cutting device of the sewing machine according to the present invention reduces the driving amount of the moving knife by changing the position of the driving support point of the drive transmission means of the cutting device by the driving means when the cloth is cut into a curved shape. Let it. Then, the female swinging means is quickly driven by the transmission means in synchronization with the driving of the driving means.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. The same parts as in the conventional example are denoted by the same reference numerals, and redundant description will be omitted. FIGS. 1 to 3 are views showing an embodiment of a sewing machine provided with a cutting device according to the present invention.

FIG. 1 is a perspective view showing the configuration of the cutting device. Reference numeral C denotes a driving amount reducing means provided in the cutting device.

Reference numeral 10 denotes a rod for engaging one end of the eccentric cam 3 with reference numeral 8.

An adjustment link 12 has one end supported by a shaft 9 at the other end of the rod 10 and the other end of the link 8. The other end is connected to an adjustment arm 11 having a U-shape.
3 so as to be rotatable.

The adjusting arm 11 is rotatably provided on a machine frame (not shown) of the cutting device by an arm 11a, and a lever 11b is fixed to the arm 11a.

B is a solenoid as a driving means for driving the drive reducing means C having the above-mentioned structure,
The advancing / retracting portion of the solenoid B is a lever 11b of the adjusting arm 11.
It is provided so as to face.

In the cutting device having the above-described structure, the adjusting arm 11 is rotated about the arm 11a by the advance of the solenoid B as indicated by an arrow.

The rotation of the adjusting arm 11 causes the shaft 13 as a rotating shaft to move, and as shown in FIG.
The rotation path of the distal end shaft portion 9 (see FIG. 1) is an arc c
To arc b.

Thus, the drive limit position of the shaft 9 (the arm 11
Since the distance from the vertical line a) to the vertical line a) is short and the driving amount of the link 8 and the moving knife support 5 connected to the shaft 9 is also short, the driving amount of the moving knife M is reduced. I can do it.

FIG. 3 is a circuit diagram showing the speed change means. In the figure, 1 is the motor shown in FIG. 1, and B is the solenoid shown in FIG.

S is a switch (two-circuit switch), and when the cutting reaches the curved portion of the cloth, this switch S
, The solenoid B is driven, and the driving amount of the moving knife M is reduced as described above.
It is possible to increase the rotation speed of the motor 1 for driving the moving knife M and to make the swing of the moving knife M faster.

[0024]

As described above, the cutting device for the sewing machine according to the present invention has a driving amount reducing means for reducing the driving amount of the moving knife of the cutting device, a driving means for driving the driving amount reducing means, and a driving device. Gear shifting means for increasing the driving speed of the female swing means simultaneously with the driving of the means.
At the time of cutting the curved portion of the fabric, the moving knife of the cutting device can be driven quickly, finely and finely, and the cutting of the curved portion can be made appropriate and high quality can be secured.

[Brief description of the drawings]

FIG. 1 is a configuration perspective view showing an embodiment of a cutting device for a sewing machine according to the present invention.

FIG. 2 is an explanatory diagram showing a change in a driving support point when a driving amount reducing unit of the cutting device of the sewing machine shown in FIG. 1 is driven.

FIG. 3 is a circuit diagram showing a configuration state of a speed changing means for speeding up driving of a female swinging means in synchronization with driving of a driving means.

FIG. 4 is an external perspective view showing a cutting device of the sewing machine.

FIG. 5 is a perspective view showing a configuration state of a conventional sewing machine cutting device.

6 is an external perspective view showing a curved portion of the fabric cut by the cutting device of the sewing machine shown in FIG. 5;

[Explanation of symbols]

 B drive amount reducing means C driving means M moving knife 1 knife swinging means

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-53-15954 (JP, A) JP-A-59-188077 (JP, U) JP-A-51-53165 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A cutting device for a sewing machine configured to cut a fabric to be sewn into a predetermined shape, wherein a drive fulcrum position of a drive transmitting means provided between a moving knife of the cutting device and a knife swinging means is set. A driving amount reducing means for changing the driving amount of the driving knife, a driving means for driving the driving amount reducing means, and a shifting means for increasing the driving speed of the knife swinging means when the driving means is driven. And a cutting device for a sewing machine.