JPS62201185A - Sewing machine with reversal presser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sewing machine with an inverted presser foot that allows the sewing direction of a pattern to be set either clockwise or counterclockwise.

Traditionally, when sewing workpieces such as appliques and patches onto workpieces, it has been known to use a sewing machine equipped with an inverted presser foot to hold the workpieces such as appliques. ing. FIG. 8 is a perspective view of a conventional sewing machine with an inverted presser foot of this type, in which the sewing machine main body l is connected to the sewing machine table 2.
A reversing presser foot 4 is fixed to a reversing presser foot 4' connected to the reversing crankshaft 3 at the top, and this reversing presser foot 4 is rotated by a pulse motor (not shown) directly below a needle 6 fixed to a needle bar 5.
It is attached movably in the axial direction and the Y-axis direction.

Further, a reversing mechanism 7 is attached to the side surface of the sewing machine body 1.

The reversing crankshaft 3 is reversed by this reversing mechanism 7.

In the conventional sewing machine with an inverted presser foot configured as described above, as shown in FIG. 9, the inverted presser foot 4 moves the workpiece cloth 8 in the X-axis direction and the Y-axis direction, starting from the sewing start point A! The reversing mechanism 7 operates at a predetermined timing to reverse the reversing crankshaft 3 of the reversing presser foot 4 to the position indicated by the dashed line.
When the sewing has been completed to the sewing end point B, the sewing of the workpiece cloth 8 is completed.

□ 1 In the conventional sewing machine with a reversing presser foot as described above, the reversing crankshaft 3 is uniquely positioned on the solid line side (hereinafter referred to as side a) at the sewing start point A in Fig. 9. 1 is determined and sewn clockwise (in the direction of the arrow).

At the time when line Q is crossed during this sewing, the reversing crankshaft 3 is set to the one-dot chain line side (hereinafter referred to as the "side"), and sewing is performed to the sewing end point B, thereby completing the - cycle sewing.

Since the reversing crankshaft 3 is controlled in this way, when sewing is performed to the left of the sewing start and sewing counterclockwise, the reversing crankshaft 3 and the needle 6, which are on the a side,
This type of sewing was impossible because the needles interfered and broke the needle.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a reversing crankshaft for supporting an inverting presser foot of a sewing machine, a reversing means for driving the reversing crankshaft in reverse, and a reversing presser foot. a cloth feeding means for moving the table and the reversing crankshaft in the X-Y direction; an input means for inputting a sewing pattern to be applied to the sewing cloth; a means for storing sewing information from the input means; and a means for storing sewing information from the sewing information. a first means for determining the initial position of the reversing crankshaft; a second means for driving the reversing means to move the reversing crankshaft to the initial position; and driving the sewing machine based on the sewing information to The present invention is characterized by comprising a drive control means for applying the sewing pattern to the mvi cloth.

According to the present invention, the initial setting of the reversing crankshaft can be set corresponding to the mm pattern, so that the pattern can be sewn in one clockwise or counterclockwise direction.

χ5M FIG. 1 is a block diagram of a main part of a circuit that operates a sewing machine with an inverted presser foot according to the present invention.
and a recording device 13 are connected, and an input device 14 is also connected to the control circuit IO. Furthermore, the control circuit 10 is connected via an interface 15 to drive circuits 16, 17, 18, respectively. The reversing crankshaft 3 shown in FIG. 8 is connected to the drive circuit 16, and the X motor 19 and the V motor 20 are connected to the drive circuit 17.
9 and a V motor 20 drive the reversing presser foot 4.

Further, the drive circuit 18 is connected to a main shaft motor 21 that rotates the main shaft of the sewing machine body 1.

Next, the operation of the sewing machine with an inverted presser foot according to this embodiment will be explained. First, when sewing with a sewing machine with an inverted presser foot, input device 1
4, the sewing pattern work must be carried out. An example of inputting this sewing pattern is shown in FIG. 2. First, the machine origin O must be input, and then the movement route from 0 to the sewing start point A must be defined. If this route O→A is set as a straight line, when the sewing machine is actually driven, there is a risk that the sewing machine needle 6 will interfere with the reversing presser foot 4' to which the reversing presser foot 4 is fixed in the sewing machine with the reversing presser foot shown in Fig. 8. Therefore, the route must avoid the inversion presser foot 4' as shown in point #lC in FIG.

After defining this route, the actual sewing route must be carried out from the sewing start point A to the sewing end point B, as shown in the single-dot chain l1AD in FIG.

Here, as shown in Fig. 3(a), if the jump feed direction from the origin is specified to the right of the origin O, that is, in the +X direction, the sewing direction is clockwise (hereinafter simply referred to as clockwise sewing).
In addition, as shown in Fig. 3(b), if the sewing direction is specified to the left from the origin, that is, in the -X direction, the sewing direction will be counterclockwise (
Hereinafter, it is simply referred to as "counterclockwise Il").

In the case of this clockwise sewing, the reversal line Q in Fig. 3 (a) is defined in the +X direction from the predetermined coordinates (0, α), and at the point when it crosses the reversal line Ω, the reversal crankshaft 3 is on the b side. be defeated by When the reversing crankshaft 3 moves in the opposite direction of the arrow R and crosses the reversing line Ω, the reversing crankshaft 3 is controlled so as to fall toward the side a at the point in time when the reversing line Ω is crossed.

Next, in the case of one counterclockwise sewing, the reversal line a' in FIG. is turned to side a. Then, when it moves in the opposite direction of the arrow and crosses the reversal line Q'.

At the point in time when the inversion crankshaft 3 exceeds this point, the reverse crankshaft 3 is controlled so as to fall toward the b side.

By controlling the reversing crankshaft 3 as described above, it is possible to perform clockwise sewing or counterclockwise sewing without requiring any unnecessary movement when using the reversing presser foot 4.

FIG. 4 is a flowchart showing the operation control of the circuit of the sewing machine with the reverse presser foot shown in FIG.
The sewing pattern is read out from the recording device [13 in FIG. 1 and stored in the read/write memory 11.

(2) Determine whether the line side pattern is a pattern that uses the inversion presser foot 4.

(3) The control circuit 10 drives the X motor 19 and the Y motor 20 by the drive circuit 17 via the interface, and moves the reversing presser foot 4 to the original position.

(4) Is the jump feed up to the sewing start point in the +X direction or -?
Determine whether it is in the X direction.

(5) If it is in the +X direction, the reverse crankshaft 3 for clockwise sewing is controlled.

(6) Set the reversal line ρ of the reversible crankshaft 3 according to the idle feed direction.

gourd (7) Move the anti-boiling foot 4 from the origin to the sewing start point.

(8) The reversing crankshaft 3 is tilted toward the a side by the drive unit 16 via the interface 15.

(9) The start switch of the sewing machine turns on (11)
) The drive circuit 18 drives the main shaft motor 21 of the sewing machine body 1 to perform sewing according to the sewing pattern.

(12) Determine whether the reversal line Ω has been crossed.

(13) At the point when it crosses the reversal line a, the reverse crankshaft 3
Move it to the b side.

(14) Next, do the line side.

(15) When the sewing is finished, the sewing machine moves to the sewing start point again and waits for the start switch of the sewing machine to be operated.

On the other hand, if the idle feed direction is -X in the above (4),
(5') Control the reverse crankshaft 3 for counterclockwise sewing.

(6') The crankshaft 3 is reversed due to the idle feed direction.

(9') Wait for the start switch of the sewing machine to turn on.

(10”) Tilt the reverse crankshaft 3 to the b side.

(11') The drive circuit 18 drives the main shaft motor 21 of the sewing machine body 1 to perform sewing according to the sewing pattern.

(12') Determine whether the reversal line a' has been crossed.

(13'') When the reversing line a' is crossed, the reversing crankshaft 3 is tilted toward the a side.

(14') Further perform the line side.

(15″) When the sewing is finished, move to the sewing start point again,
Wait for the start switch of the sewing machine to be operated.

In this way, in the pattern when using the inverted presser foot 4, there is no restriction on the sewing direction, and one counterclockwise sewing can be performed without unnecessary movements, thereby shortening the sewing time.

FIG. 5 is a flowchart of another embodiment of the present invention, in which sewing direction data is input in advance when creating a sewing pattern. Therefore.

(1) Read the sewing pattern from the recording device 13 in Figure 1. It is stored in the read/write memo 11.

(2) Determine whether the line side pattern is a pattern that uses the inversion presser foot 4.

(3) The control circuit IO drives the X motor 19 and the Y motor 20 by the drive circuit 17 via the interface, and moves the reversing presser foot 4 to the original position.

(4) The sewing direction is determined based on the sewing pattern from the sewing start point, regardless of the jump feed direction from the origin.

(5) If it is in the +X direction, control of the reverse crankshaft 3 for clockwise sewing is performed, so the process moves from (2) to (6) in FIG.

(5') - In order to control the reverse crankshaft 3 for counterclockwise sewing in the -X direction, (6'
).

FIG. 6 is a flowchart of still another embodiment of the present invention, in which the sewing direction is set near the inverted crankshaft 3 when creating the sewing pattern as shown in FIG. Lines m and n are set, and data indicating whether the sewing pattern first crosses line m or n is input in advance. Therefore, (1) The sewing pattern is read from the recording device 13 shown in FIG. 1 and stored in the read/write memory 11.

(2) Determine whether the sewing pattern uses the reverse presser foot 4 or not.

(3) The control circuit 10 drives the X motor 19 and the Y motor 20 by the drive circuit 17 via the interface.

Move the reversing presser foot 4 to the origin position.

(4) The sewing direction is determined based on the line m or n that the sewing pattern first crosses, regardless of the direction of the jump feed from the origin.

(5) If the line is m, in order to control the reverse crankshaft 3 for clockwise sewing, the process moves from (2) to (6) in FIG. 4.

(5'') line is n, in order to control the reverse crankshaft 3 for counterclockwise sewing, (6') in Fig. 4 is performed from ■.
).

As is clear from the above explanation, the present invention eliminates restrictions on the sewing direction when using a reverse presser foot, and also makes it possible to sew counterclockwise without unnecessary movements. , there is an advantage that the sewing time can be shortened.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the main parts of a circuit that operates a sewing machine with an inverted presser foot according to an embodiment of the present invention, FIGS. 2 and 3 are diagrams for explaining the principle of FIG. 1, and FIG. 1 is a flowchart for explaining the control operation of the circuit, FIG. 5 is a flowchart for explaining the operation of a sewing machine with an inverted presser foot according to another embodiment of the present invention, and FIG. 6 is a flowchart for explaining the operation of a sewing machine with an inverted presser foot according to another embodiment of the present invention. A flowchart to explain the operation of the sewing machine with an inverted presser foot,
FIG. 7 is a plan view of a reversing crankshaft for explaining the flowchart of FIG. 6, FIG. 8 is a perspective view of a sewing machine with a reversing presser foot, and FIG. 9 is a diagram for explaining the drawbacks of the conventional sewing machine. 3...Reversing crankshaft, 4...Reversing presser foot, 9...
Microcomputer, 10... Control circuit, 11...
・Read/write memory, 12...Read-only memory, 1
3... Recording device, 14... Input device, 15... Interface, 16°17.18... Drive circuit, 19
...X motor, 20...Y motor, 21...main shaft motor. Applicant Tokyo Heavy Equipment Co., Ltd. Figure 1-1 Figure 3 (α) (b) Figure 5

Claims (1)

[Claims] a reversing crankshaft for supporting an inverting presser foot of a sewing machine; a reversing means for driving the reversing crankshaft in reverse; a cloth feeding means for moving the reversing presser foot and the reversing crankshaft in the X-Y direction; an input means for inputting a sewing pattern to be applied, a means for storing sewing information from the input means, a first means for determining an initial position of the reversing crankshaft from the sewing information, and a first means for driving the reversing means. a second means for moving the reversing crankshaft to an initial position; and a drive control means for driving the sewing machine based on the sewing information to apply the sewing pattern to the sewing cloth. Sewing machine included.