JPS6243716B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reciprocating motor, and is particularly suitable for driving an automatic thread trimming mechanism of a sewing machine.

Figures 1 to 3 are configuration diagrams showing this type of reciprocating motor that the inventors have already proposed. Figure 1 shows the stator section, and Figure 2 shows the rotor section. FIG. 3 shows the configuration of a cam portion for connection to an automatic thread trimming mechanism of a sewing machine. In FIG. 1, a stator 1 has a first magnetic pole 1a which is made up of soft magnetic members 2, 3, and 4 having a wide spread width at a predetermined angle, which are integrally formed by bolts 5 and nuts 6 passing through the inside of the soft magnetic members 2, 3, and 4. A second magnetic pole 1b is also formed integrally with a bolt 5 and a nut 6, and soft magnetic members 7, 8, and 9 having a narrow spread width are provided, and the soft magnetic member 2 of the first magnetic pole 1a is There is a magnetic gap 1 between and 3 and 3 and 4.
0 is formed and a coil 11 is formed within this magnetic gap 10.
is installed. Similarly, the second magnetic pole 1b
A magnetic gap 12 is formed between the coils 13 and the first magnetic pole 1a and the second magnetic pole 1.
A non-magnetic member 14 is interposed between the slit 1c and the slit 1c, forming two electromagnets.

FIG. 2 is a block diagram showing a rotor 15 having magnetic pole pieces rotatably supported in the magnetic gaps 10 and 12 of the stator 1. In the figure, the rotor 1
5 is equipped with magnetic pole pieces 17, 17 tightened by bolts 5 and nuts 6 on both sides of a spacer 18 fixed to a rotating shaft 16, and the magnetic pole pieces 17, 17 are connected to soft magnetic members 19, 19, 20, respectively. , 20, a permanent magnet 21 is attached to the tip of the soft magnetic members 20, 20, and a first magnetic pole piece 17a having a relatively wide spread width is connected to the first magnetic pole piece 17a with a gap 17c therebetween. The second one has a narrow spread width.
The magnetic pole piece 17b is formed.

In addition, in FIG. 3, the cam part has a pin 22 planted on a flange 21 fixed to the rotating shaft 16 of the reciprocating motor, and a cam 24 fixed to a load shaft 23 connected to a thread cutting mechanism. It is configured to engage with the notch 25 at a predetermined play angle.

When the reciprocating motor having the above configuration is used to drive the automatic thread cutting mechanism of the sewing machine, there is a thread selection mode in which the load shaft 23 is rotated approximately 60 degrees with a torque of approximately 1 kg cm, and a thread selection mode in which the selected thread is cut with a cutter. about 7 to
Approximately in the same direction as the thread selection mode above with a torque of Kg/cm.
A cutting mode in which the cutter is rotated by 10 degrees, a first return mode in which the cutter is rotated approximately 10 degrees in the opposite direction to the above-mentioned cutting mode with a torque of 7 kg cm to release the engagement, and the same as this first return mode. about 1 in the direction
The motor has a second return mode in which it rotates approximately 60 degrees with a torque of Kg/cm, but in order to perform these drives smoothly, the rotor 17 of the motor has a wide spread width as shown in Fig. 2. It had to have. For this reason, the space required for rotation of the rotor 17 becomes large, which is disadvantageous in that it is inconvenient to attach it to a sewing machine.

The present invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by providing a motor that shares the drive mode of the thread trimming mechanism of the sewing machine, it can be attached to the thread trimming mechanism even in a narrow space. It is something that has been trained.

An embodiment of the present invention will be described below with reference to FIGS. 4 to 8. The reciprocating motor according to the present invention is a first reciprocating motor that is involved in a cutting mode and a first return mode as a drive mode of an automatic thread trimming mechanism of a sewing machine.
a second motor involved in the yarn selection mode and the second return mode, and a power provided commonly to the first and second motors to apply a predetermined rotation angle and torque to the load shaft. It is equipped with a transmission mechanism.

In FIG. 4, the first motor includes soft magnetic members 26a, 26b and soft magnetic members 26a.
and 26b, and soft magnetic members 27a, 27b, 27.
The stator 27 includes a coil 27f wound around a soft magnetic member 27c. And the soft magnetic member 2 of the rotor 26
6a and 26b each have a slit at a predetermined angle, and the magnetic pole piece is divided into two.
On the other hand, the soft magnetic members 27a, 27 of the stator 27
c and 27e form protruding magnetic poles, and between the soft magnetic members 27a and 27c and between 27c and 27
A magnetic gap is formed between the two and e. Therefore, due to the biasing of the coil 27f of the stator 27, magnetic potential differences are provided between the soft magnetic members 27a and 27c and between 27c and 27e, and the rotor 2
The magnetic pole pieces of the soft magnetic members 26a and 26b of No. 6 near the stator magnetic poles are attracted into the magnetic gap, and by controlling the direction of the current flowing through the coil 27f of the stator 27, the magnetic pole pieces of the rotor 26 can be The first motor can be used to drive the cutting mode and the first return mode by rotating the load shaft 16 in the forward and reverse directions, thereby applying a torque of approximately 7 kg cm to the load shaft 16 by rotating the load shaft 16 by 10 degrees. can.

In addition, in FIG. 5, the second motor includes an integrated soft magnetic body 28 with a predetermined angular spread width.
a, 28b, 28c, and a permanent magnet 28d attached to a soft magnetic body 28c.
and a stator 29 including soft magnetic bodies 29a, 29b, and 29c and a coil 29d wound around the soft magnetic body 29c. and stator 29
The soft magnetic bodies 29a and 2 are energized by the coil 29d.
A magnetic potential difference is given to 9c and 9c. The permanent magnet 28d attached to the soft magnetic body 28c of the rotor 28 is
When the coil 29d is energized, the stator 29
When the coil 29d is deenergized, it is attracted into the magnetic gap between the soft magnetic bodies 29a and 29c of the stator 29, and therefore moves the rotor 28 in the forward and reverse directions. If the two motors are rotated so that a torque of approximately 1 kg cm is applied to the load shaft 16 by 60 degrees of rotation, this second motor can be used for driving the thread selection mode and the second return mode. .

Furthermore, in FIGS. 6 and 7, the load shaft 16 of the automatic thread trimming mechanism of the sewing machine is connected to the upper support member 3.
The load shaft 16 is rotatably supported by brackets 31 and 32 at the load shaft 16.
The rotor 26 of the motor and the soft magnetic members 28a, 2
8b, 28c and a permanent magnet 28d, and a rotor 28 of a second motor arranged in tandem with the rotor 26 is rotatably supported via a connecting portion 32. The rotors 26 and 28 are moved in the load shaft direction by a fixed member 33 fixed to the load shaft 16, a cam element 34a rotatably supported by the load shaft 16, and a cam element 34b fixed to the load shaft 16. moving and said cam elements 34a and 34b
This prevents disengagement. On the other hand, stators 27 and 29 are fixedly supported in tandem by brackets 36 and 36 on the lower support member 35 at positions where they interact with the rotors 26 and 28 of the first and second motors.

The reciprocating motor of the present invention having the above structure operates in the same way as a conventional motor, but the difference from the conventional motor is that the conventional motor can perform thread selection mode, cutting mode, and first mode using a single motor. In contrast, the device of the present invention includes first and second motors, and the first motor drives the cutting mode and the first return mode. The second motor is used to drive the thread selection mode and the second return mode. Furthermore, whereas the conventional power transmission mechanism consists of a cam structure that connects the rotating shaft and the load shaft, the power transmission mechanism of the present invention has the rotors of the first and second motors and the load shaft connected to the load shaft. The cam elements are directly disposed in tandem, rotatably supported by the shaft, and the cam element fixed to the load shaft constitutes a power transmission mechanism, thereby eliminating the need for a conventional rotating shaft.

Therefore, each rotor 2 of the first and second motors
6 and 28 need only have a predetermined angular spread width suitable for each drive mode, and therefore the space required for rotation can be reduced compared to conventional ones. That is, as compared with FIGS. 8a and 8b, the rotor 15 of the conventional motor has a predetermined angle β ₁
When performing the operation in the drive mode described above with a spread width _of
In the motor according to the present invention, the rotors 26 and 28 are separated, and the spread width of the rotor becomes _β2 , which is smaller than the above angle _β1 , and the space required for rotation is reduced to α+ _β2.
This makes it convenient to attach to a sewing machine.

As described above, according to the present invention, the cutting mode and the first
A first motor involved in the return mode of Since the reciprocating motor is equipped with a transmission mechanism, the space required for rotation is narrower than that of conventional motors, and a reciprocating motor suitable for driving an automatic thread trimming mechanism of a sewing machine can be obtained.

[Brief explanation of the drawing]

Figures 1 to 3 are configuration diagrams showing a conventional reciprocating motor, where Figure 1 shows the stator and Figure 2 shows the rotor. In Figures 1 and 2, a is a front view, and b
is a side view, and c is a plan view. Moreover, FIG. 3 shows a cam part, a is a front view, and b is a side view. 4 to 7 are configuration diagrams showing a reciprocating motor according to an embodiment of the present invention, in which FIG. 4 is a perspective view of the first motor, FIG. 5 is a perspective view of the second motor, and FIG.
This figure and FIG. 7 are a front view and a side view showing the overall structure of the reciprocating motor. FIG. 8 is an explanatory diagram for explaining the space required when the rotor rotates, in which a shows the conventional one and b shows the one according to the present invention. In the figure, 16: load shaft, 26: rotor of the first motor, 28: rotor of the second motor, 34
a, 34b: cam elements. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A reciprocating motion in which a load shaft connected to an automatic thread trimming mechanism of a sewing machine is rotated in a predetermined direction with a predetermined torque value in a thread selection mode, a cutting mode, a first return mode, and a second return mode, respectively. The motor includes first and second motors, and a cam element that is rotatably supported and connected to the load shaft in tandem with the rotors of the first and second motors, and a cam element that is rotatably supported on the load shaft. a driving force transmission mechanism comprising another cam element that is fixed and engages the cam element, the first motor is provided in a thread selection mode and a first return mode, and the second motor is provided in a cutting mode. and a second return mode.