JPH03258292A - State indicator of sewing machine - Google Patents

Abstract

PURPOSE:To make the indication of a fixed index a needle position indicator clear with a simple constitution by a method wherein the fixed index serves for the indication of a power source indicator in common. CONSTITUTION:When a switch of a power circuit of a driving motor is turned on, an indicator 10 provided on the front face of a sewing machine frame 2 lights on, and the indicator 10, e.g. the fixed index, is collated with a movable index 12 on a pulley so that the upper position of a needle, e.g. the stop position, is confirmed. Fixed side components of a detector 5 are housed inside a cover 23, and the indicator 10 which indicates the on-off state of the power source of the driving motor is arranged on the front face of the sewing machine frame 2. The indicator 10 especially serves for the fixed index too and is located opposite to the movable index 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a sewing machine status display device that displays the open/close status of a power supply circuit of a driving motor of a sewing machine.

Generally, in motor-driven devices, the energization state of the drive power source may be determined by the so-called "wind noise" generated as the motor rotates. However, in the case of a sewing machine in which a servo motor for direct drive is controlled by a foot pedal, the relationship between the closing of the power supply circuit and the driving of the motor does not necessarily correspond. Therefore, even when the power supply circuit is closed, the drive motor is stopped except when the sewing machine is operating and sewing is being performed. Particularly in a sewing factory or the like in a noisy environment, it is inappropriate to use sounds such as "wind noise" to determine the open/closed state of a power supply circuit by hearing. For this reason, as a means for determining whether the power supply circuit of the drive motor is in an on state or an off state, a method of visually displaying using light from an indicator lamp or the like has been adopted.

On the other hand, sewing machines with automatic thread trimmers are equipped with a detector that detects the position of the sewing machine needle that moves up and down, and generally stops the sewing machine when the sewing machine needle is at the upper position (near top dead center). The thread cutting operation is then performed. A movable indicator corresponding to the upper position of the sewing machine needle is displayed on the outer periphery of the boob, and is aligned with a fixed indicator on the sewing machine frame side to enable adjustment and inspection of the stopping position of the sewing machine needle.

[Prior Art] The configuration of a conventional sewing machine of this type is shown in FIGS. 5 to 7.

In FIGS. 5 to 7, (1) is a sewing machine table. (2) is the machine frame of the sewing machine body installed on the sewing machine table (1), (8) is the needle part, (4) is the pulley, (
5) is a detection section. (8) is the drive motor, (7)
is a power supply box, and (8) is a control unit, which are attached to the lower side of the sewing machine table (1). Also, (9)
is the belt, (work 0) is the indicator lamp, and (11) is the electric wire cable. The belt (9) connects the motor (6) and the pulley (4) via the sewing machine table (1), and the electric wire cable (11) connects the control section (8) and the detection section (5).

In Figure '1s8, (12) is a movable index [-during timing] provided on the circumferential surface of the pulley (4), and (13) is a fixed index.

A fixed index (13) is carved on the front surface of the machine frame (2) and is provided opposite to a movable index (12) provided on the pulley (4).

When the power box (7) of the sewing machine configured as described above is turned on, the indicator lamp (lO) lights up to display the closed state of the power supply circuit of the drive motor (6). Then, when the motor (6) rotates via the control unit (8),
Pass the belt (9) and pulley (4) through the sewing machine frame (2)
The needle portion (3) at the tip of moves up and down.

The vertical movement of the needle (3) corresponds to the rotation speed of the pulley (4), and the detection unit (5) detects the stop position of the needle (3) and the pulley (4).
4) is detected and controlled by the control section (8).

Further, the stopping position of the needle portion (3) is adjusted and confirmed by aligning the movable indicator (I2) on the rotating pulley side with the fixed indicator (13).

[Problems to be Solved by the Invention] In the case of the above-described conventional sewing machine shown in FIG. The power supply box (7) is installed on the back side of the power supply box (7). Therefore, although it has the advantage of being convenient for wiring, the sewing machine table (
1) There are disadvantages in the layout of sewing machines where work is done above.

In addition, in Fig. 6, the indicator lamp (lO) is connected to the sewing machine frame (2).
) Since it is installed in front of the display box (I4) attached to the top surface of the power supply, there are no problems with the display function as the power-on status can be clearly seen. However, although not shown in the upper part of the sewing machine frame (2), there is a mechanism for feeding the needle thread of the sewing machine, and there is a high possibility that the needle thread passing through the route may get caught. Further, there is also a problem with the wiring.Furthermore, the sewing machine shown in FIG. 7 has a configuration in which an indicator lamp (lO) is attached to the detection section (5). Since the detection part (5) is located at the protruding end of the main shaft, in this case as well, the display function is likely to be lost depending on the placement position, as in Fig. 5, and the conventional sewing machines listed in Figs. 5 to 7 have no problems. The problem was that it had some drawbacks.

The present invention has been made in order to solve the above-mentioned conventional problems, and has a simple structure by allowing the display of the open/closed state of the power supply circuit of the drive motor to also serve as a fixed indicator for the needle stop position. Furthermore, the present invention aims to realize a sewing machine status display device that clearly displays fixed indicators.

[Means for Solving the Problems] The present invention provides display means for displaying the open/closed state of the power supply circuit of the drive motor on the front surface of the sewing machine frame, and the display means is used as a movable indicator that indicates the stop position of the sewing machine needle. This is a sewing machine status display device that doubles as a fixed indicator and is placed opposite to the machine.

[Operation] When the power supply circuit for the co-driving motor is turned on, the display provided on the front of the sewing machine frame lights up, clearly indicating that the sewing machine is ready for operation. Compare the display on the front of the sewing machine frame, that is, the fixed index, with the movable index on the pulley,
For example, a fixed stop position corresponding to the upper position of the sewing machine needle is confirmed. When the power circuit switch is turned off, the display goes out and
The open circuit status is displayed.

[Embodiment of the invention] Fig. 1 is an explanatory diagram of the configuration of an apparatus according to an embodiment of the invention, and Fig.
3 is a sectional view taken along line I-1 in FIG. 2, and FIG. 4 is a sectional view taken along line 1--2 in FIG.

In Figures 1 to 4, (2) is the machine frame of the sewing machine body, (4) is the pulley, (5) is the detection unit, (9) is the belt,
(10) is the display, (11) is the electric wire cable, (12)
are movable indicators, and these parts are given the same reference numerals as in the conventional sewing machine described above and perform the same functions.

(21) is a main shaft to which a pulley (4) is attached, and (22) is a bearing fixed to the machine frame (2) and into which the main shaft (21) is rotatably fitted. (23) is a cylindrical cover formed with a flange (24) (25> is a ring, (2B) is a fixing screw. The cover (23) is attached to the end of the bearing (22) through the ring It is fixed with a screw (26), and the components on the fixed part side of the detection part (5), which will be described later, are housed inside the cylinder.In addition, here, there is a display that displays the open/closed state of the power supply circuit of the drive motor. The container (10) has a flange (
24) and is placed in an easily visible place on the front of the sewing machine frame (2). This indicator (lO) uses, for example, an LED that lights up in red when the power supply circuit of the motor (6) is closed. In particular, the display (lO) also serves as a fixed indicator and is provided facing the movable indicator (12).

(27) is an annular printed circuit board installed inside the cover (23), (51), (52), and (53) are all arranged on the surface of the printed circuit board (27), and are arranged at the needle upper position, needle lower position, and rotation. Each detector for velocity. Needle top detector (51)
As shown in Fig. 4, the needle bottom detector (52) and rotation detector (53) are connected to three transmission windows (28), (29) and (30) provided in the cover (23). The light is projected from the respective transmission windows (2g), (29), and (30), and the reflected light of the projected light is reflected again through the transmission windows (28),
(29) and (30) It consists of a light emitting and light receiving element that receives light.

(31) and (32) are a needle top detection plate and a needle bottom detection plate, (33
) is the holding plate, and these are the cover (23) of the pulley (4).
It is arranged in the cylindrical part on the adjacent end side. The needle top detection plate (31), needle bottom detection plate (32), and presser plate (33) constitute an element on the movable part side of the detection part (5).

The needle upper detection plate (31) has a slightly thicker and smaller annular shape and has a stepped portion (34) formed on its outer periphery, and the needle lower detection plate (32) on the larger annular side is fitted into this stepped portion (34). . The needle top detection plate (31) is fitted into the axially protruding cylindrical portion (35) of the pulley (4), and the outer peripheral edge of the stepped portion (34) is brought into contact with the needle bottom detection plate (32). It is pressed against the inner surface of the pulley (4) by a presser plate (33). Holder plate (
33), the needle top detection plate (31) is rotated around the cylindrical part (35), and its position relative to the movable indicator (12) on the pulley (4) can be adjusted. . (36) is a semicircular convex portion formed protruding from the outer circumference of the needle lower detection plate (32), and (37) is a semicircular convex portion provided on the inner circumference of the pulley (4) corresponding to the convex portion (36). It has four circular parts. The convex portion (3B) is engaged with the concave portion (37), thereby regulating the rotation of the needle lower detection plate (32) and positioning it relative to the pulley (4). (41) is a through-hole for the needle top formed by an arc-shaped notch provided on the outer peripheral edge of the needle top detection plate (31);
(42) is a transparent groove for the needle lowering formed by an arc-shaped notch provided on the inner peripheral edge of the needle lowering detection plate (32), and (43) is on the same circumference of the needle lowering detection plate (32). This is a rotary through hole formed by a plurality of square window-shaped through holes. Needle upper groove (41
), the needle bottom groove (42), and the rotating hole (43) are connected to the needle top detector (51) on the fixed part side attached to the cover (23).
and are provided opposite to the needle down detector (52) and the rotation detector (53). Therefore, the surfaces of the needle top detection plate (31) and the needle bottom detection plate (32) form reflective surfaces, and the needle top detection plate (32) forms a reflective surface.
51), the needle down detector (52), and the rotation detector (53), each of which receives the reflected light from the light projecting element. Further, the light emitted from the light projecting element to the needle upper hole (41), the lower needle hole (42), and the rotating hole (43) is absorbed or attenuated in these portions. In addition, although the sewing machine table (1), needle portion (3), etc. of the present invention are not shown in the drawings, they are constructed in the same manner as in FIGS. 5 to 7 described above.

The operation of the present invention having such a configuration will be described next.

When you turn on the power box, the sewing machine frame (2)
The display (10) lights up in front of the. This indicator (lO
) lights up to clearly indicate that the drive motor power supply circuit is closed and the sewing machine is ready for operation. Here, when a foot pedal (not shown) is depressed, the motor starts rotating at a rotational speed corresponding to the amount of depression via the control section. The rotational force of the driving motor is transmitted to the main shaft (21) through the belt (9) and pulley (4), and moves the sewing machine needle in the needle section provided at the tip of the sewing machine frame (2) up and down.

At this time, the light emitted from the light emitting elements of the needle top detector (51), needle bottom detector (52), and rotation detector (53) in the detection unit (5) is transmitted to the rotating needle top detection plate (31). The light is reflected by the surface of the needle detection plate (32), and each light receiving element receives the reflected light. In addition, at the positions of the needle upper groove (41), lower needle groove (42), and rotating hole (43), the light emitted from the light emitting elements of each detector (51), (52), and (53) is is absorbed, and each light-receiving element receives reflected light that has been attenuated accordingly. For this reason, the detectors (51) and (52
) and (53), a needle top detector (51) and a needle bottom detector (52) detect the top and bottom positions of the sewing machine needle, and a rotation detector (53) detects the top and bottom positions of the sewing machine needle.
) detects the rotation speed of the pulley (4) and the main shaft (21). These detection signals are sent to a control section to control the stop position of the sewing machine needle that moves up and down and the number of rotations during the sewing process. Thus, by moving the sewing machine needle up and down in the needle portion, the sewing product placed on the sewing machine table can be sewn at a desired sewing speed. Also, the upper stop position of the sewing machine needle that moves up and down is, for example, the presser plate (33) inside the pulley (4).
The needle upper detection plate (31) is moved against the friction of the cylindrical part (35).
Rotate to the right or left around (see arrow in Figure 3)
. When the needle top detection plate (31) is rotated, the needle top transmission groove (41)
The relative position of the movable mark (12) carved on the pulley (4) changes. As a result, the fixed stop position of the sewing machine needle is moved, and a "thread cutting" operation can be performed at a stop timing suitable for, for example, the upper thread. In this way, "thread trimming" is automatically performed at the appropriate timing, and sewing is interrupted or terminated.When the sewing process is completed and the motor power switch is turned off, the display (lO) goes out. The open state of the power circuit is displayed on the front of the sewing machine frame.

In the above embodiment, the case where the indicator (lO) is provided on the detector cover (23) was explained as an example, but it is not necessarily necessary to provide it on the detector cover (23). It is sufficient if it is provided at a position where it can be verified by facing the rotation index (12) on the front surface of the frame (2). In addition, although the case has been described in which the display (10) is lit continuously when the power supply circuit of the drive motor is closed to display the driveable state, for example, the rotational state of the motor while it is energized is It may be displayed by flashing to distinguish it from the closed state of the power supply circuit. By adopting such a display method, it becomes extremely convenient to be able to distinguish between the closed state of the power supply circuit and the actual driving state of the motor. Furthermore, although the rotating index (12) and the fixed index [indicator (10)] are circular in shape as a pair and are both circular in shape, a single index with an arrow and a point or a triangle, a triangle or a line with each other, and a plurality of It may be composed of an index or a combination of multiple indexes.

[Effects of the Invention] As described above, the present invention provides a sewing machine status display device in which the fixed index on the needle position display means also serves as a display on the power supply display means.

As a result, compared to the case where two displays are provided separately, the number of parts is reduced and the display mechanism can be constructed simply and at low cost. Further, since the fixed index of the hand position display means is displayed with light, the position becomes clear and confirmation and adjustment can be easily performed.

Therefore, according to the present invention, it is possible to provide a sewing machine status display device that has a simple configuration and clearly displays indicators.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of the device according to the present invention, and FIG.
Figure 3 is a sectional view taken along line 1 in Figure 2, Figure 4 is a sectional view taken along ■-■ in Figure 2, and Figures 5 to 7 are explanatory diagrams of the configuration of a conventional sewing machine. , FIG. 8 is an explanatory diagram of a part of a conventional sewing machine. In the figure, (1) is the sewing machine table, (2) is the machine frame of the sewing machine, (3) is the needle part, (4) is the pulley, (5) is the detection part, (6) is the drive motor, and (7) is the sewing machine table. ) is the power box,
(8) is a control unit, (9) is a belt, (lO) is a display,
(11) is an electric wire cable, (12) is a movable index, (I3
) is a fixed index, (14) is a display box, (2I) is a main axis, (
22) is the bearing, (23) is the detection part cover (24)
) is a flange, (25) is a ring, (2B) is a fixing screw, (27) is a printed circuit board, (28), (29>,
(30) is a transmission window, (31) is a needle top detection plate, (32) is a needle bottom detection plate, (33) is a presser plate, (34) is a stepped part, (3
5) is a cylindrical part, (36) is a convex part, (37) is a concave part, (4
1) is the needle upper groove, (42) is the needle lower groove, (43) is the rotating hole, (51) is the needle upper detector, (52) is the needle lower detector,
(53) is a rotation detector. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] A power supply display means for displaying the open/closed state of a power supply circuit of a motor for driving a sewing machine, a movable index provided on the outer periphery of a pulley and indicating the position of a needle of the sewing machine that moves up and down, and a movable index facing the movable index. A sewing machine status display device comprising: needle position display means for displaying a stop position of the sewing machine needle, which is a fixed index provided on the front surface of the sewing machine frame; A sewing machine status display device, characterized in that it also serves as a display.