JPH0246851Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a seam allowance control device for a sewing machine that controls the seam allowance by pressing two rotary bodies rotatably attached to the fabric in the feeding direction of the fabric against the fabric. .

[Prior Art] In order to control the seam allowance at a constant position, a press roller for controlling the fabric edge is used, which moves the fabric in a direction perpendicular to the feeding direction of the fabric. Also,
In order to detect the feed amount of the fabric, a fabric movement amount detecting device is provided which includes a contact-type measuring wheel between the presser foot of the sewing machine and the fabric edge control pressure roller.

[Problems to be solved by the invention] However, in such a conventional seam allowance control device, during sewing work, the pressure roller for controlling the edge of the fabric generates large sliding resistance in the feed direction of the sewing machine. For this reason, the fabric stretches between the presser foot of the sewing machine and the distance of the stretched fabric is measured using a contact measuring ring installed between the presser foot of the sewing machine and the pressure roller for controlling the edge of the fabric. There was a problem that an error occurred between the actual measurement value and the measurement value after sewing was finished.

Further, with conventional seam allowance control devices, when sewing easily stretchable fabrics such as knitwear, there is a problem in that the quality of the sewing product deteriorates, such as when the seam pitch becomes less than half of the set value.

Furthermore, in woven fabrics, the elongation rate of the fabric differs depending on the angle of the weave, so there is a problem in that the correction algorithm for correcting this elongation rate becomes complicated.

Furthermore, the fabric stretches in the vertical direction and simultaneously shrinks in the horizontal direction, but if you control the seam allowance in this state,
There was a problem in that the seam allowance was too large when measured when the seam was finished.

In the present invention, two rotating bodies having spherical surfaces are provided on a rotating frame so that their rotational axes are orthogonal to each other and can freely rotate in the direction of movement of the fabric, and the rotating frame is configured to be able to rotate orthogonally to the fabric. It is an object of the present invention to provide a seam allowance control device for a sewing machine in which the fabric has no resistance in the moving direction and the fabric does not stretch.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has two rotary bodies installed in series in the dough feeding direction and rotatably attached to the dough feeding direction. The rotating body is mounted on a rotating frame that is rotated in a direction perpendicular to the rotating body, and the rotational axes of the two rotating bodies are orthogonal to each other, and a part of the surface of at least one of the rotating bodies is always in contact with the fabric. The edge of the fabric is detected by a sensor, and the rotary frame is reversibly rotated by a seam allowance control motor based on the output of the sensor to control the edge of the fabric to a predetermined position. .

[Function] According to the sewing machine seam allowance control device of the present invention, the edge of the fabric is detected by a sensor, and the data is sent to the CPU.
The output is calculated and used to drive the seam allowance control motor, and when the power is used to rotate the rotating frame via the timing belt, the rotational axes of the rotating frame are rotated 90 degrees apart from each other in the direction of fabric movement. Two freely provided rotating bodies rotate and transmit force to the fabric in a direction perpendicular to the feeding direction to control the seam allowance.

[Example] Referring to FIG. 1, in the seam allowance control device of the present invention, a light source 1 and a sensor (solar cell) 2 are connected to a CPU 4 via an interface 3, and
The output of the CPU 4 is connected to a seam allowance control motor 6 via a motor driver 5. This seam allowance control motor 6 is attached to a bracket 8 fixed to a frame 7, and a pulley 10 is fixed to a rotating shaft 9 of the seam allowance control motor 6 that protrudes from the bracket 8.
A timing belt 11 is hung on the bracket 8, and the timing belt 11 is hung on a pulley 13 fixed to a rotating shaft 12 protruding from the bracket 8. Furthermore, the rotating shaft 12 is connected to a rotating frame 14 that is rotatably provided on the frame 7, and this rotating frame 14 has two rotating bodies 15 and 16 having spherical surfaces that rotate in the direction of movement of the fabric (arrow A). These rotating bodies 15,
The 16 rotating shafts 15a, 16a are provided with a difference of 90 degrees from each other. In addition, these rotating bodies 1
The contact surfaces 15b and 16b with the fabric No. 5 and 16 are the second
As shown by the solid line and the dotted line in the figure, the contact surfaces 15b and 1 of the rotating bodies 15 and 16 are provided at different angles of 90 degrees from each other, and in any position, the contact surfaces 15b, 1 of the rotating bodies 15, 16
6b is configured to be in contact with the fabric. Further, arms 17 and 18 provided on both sides of the rear part of the frame 7 are attached to a sewing machine table 19 as shown in FIG.
The arm 22 in the middle is connected to a piston 25 of an air cylinder 24 via a lever 23.

In the sewing machine seam allowance control device of this embodiment configured as described above, a light source 1 and a sensor (solar battery) 2 are provided.
When the sensor 2 detects the edge of the fabric moving between the
It is taken into CPU4. Depending on this data
When a signal is sent from the CPU 4 to the motor driver 5, the seam allowance control motor 6 is driven. When the seam allowance control motor 6 rotates, the pulley 13 is rotated by the timing belt 11 hooked on the pulley 10 fixed to the rotating shaft 9 of the seam allowance control motor 6.
As a result, a rotating frame 14 connected to a rotating shaft 12 to which a pulley 13 is fixed rotates.
Due to the rotation of the rotating frame 14, the rotating body 1
5 and 16 reversibly turn the fabric in the direction of arrow B.

Here, when the rotating bodies 15 and 16 are rotating in the direction of arrow B perpendicular to the moving direction of the fabric, if the sewing machine is feeding the fabric in the moving direction of arrow A, the rotating bodies 15 and 16 Since it can rotate freely with respect to the sewing machine's feed mechanism and rotating bodies 15 and 16, it rotates as the fabric moves in the A direction, and there is no friction in feeding the fabric.
The dough does not stretch between the two.

In this way, sewing is performed by controlling the rotating bodies 15 and 16 to move the edge of the fabric to a predetermined position. When the sewing is finished, the air cylinder 24 is driven and the piston 25 pushes the arm 22 via the lever 23, causing the rotating bodies 15 and 16 to rise, allowing the fabric to be set again.

[Effects of the invention] Since the present invention is configured as described above,
Since the fabric does not stretch between the presser foot of the sewing machine and the rotating body of the seam allowance control device, the amount of movement of the fabric that is placed in contact with the fabric between the presser foot of the sewing machine and the rotating body of the seam allowance control device is detected. There is no difference between the measurement value of the length measuring wheel and the finished seam, and there is no difference between the seam pitch setting regardless of the type of fabric, and the elongation correction value is adjusted depending on the angle of the fabric's weave. Since there is no need to change the control algorithm, the control algorithm can be simplified. Furthermore, since the fabric no longer stretches in the longitudinal direction and also shrinks in the seam allowance direction, there are advantages such as no change in the seam allowance.

[Brief explanation of the drawing]

1 is a perspective view of a seam allowance control device for a sewing machine according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the rotating body of FIG. 1, and FIG. 3 is a side view of the device of FIG. 1. 1...Light source, 2...Sensor (solar cell), 3...
...Interface, 4...CPU, 5...Motor driver, 6...Seam allowance control motor, 7...Frame, 8...Bracket, 9...Rotary axis, 10...
...Pulley, 11...Timing belt, 12...
...Rotating shaft, 13...Pulley, 14...Rotating frame, 15, 16...Rotating body, 17, 18...Arm, 19...Sewing machine table, 20, 21...Support stand, 22...Arm, 23 ...Lever, 24...
Air cylinder, 25...piston.

Claims (1)

[Scope of utility model registration request] Two rotating bodies arranged in series in the fabric feeding direction and rotatably mounted are attached to a rotating frame that rotates in a direction perpendicular to the fabric feeding direction, and the rotation of the two rotating bodies is The axes are provided perpendicularly to each other, and a part of the surface of at least one rotating body is always in contact with the fabric, and an edge of the fabric is detected by a sensor,
A seam allowance control device for a sewing machine, characterized in that the rotary frame is reversibly rotated by a seam allowance control motor based on the output of the sensor to control an edge of the fabric to a predetermined position.