JPH0767515B2 - Position detector - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detecting device such as a needle position detecting device for detecting the needle position of a sewing machine from a rotating body.

[Prior Art] FIGS. 9 to 13 show a needle position detecting device for a conventional sewing machine shown in Japanese Utility Model Laid-Open No. 61-45081. In the figure, (2) is a main shaft for vertically moving a sewing machine needle, which is rotatably supported by a bearing (1a) having a structure integrated with the sewing machine frame (1).

A pulley (3) receives a power transmitted from a motor (not shown) by a belt (12) and is fixed so as to rotate integrally with the main shaft (2).

(4) and (5) are annular needle down position detecting plate and needle up position detecting plate, respectively, which are the surface of the pulley (3) on the side of the sewing machine frame (1), and the needle down position detecting plate (4) On the outer peripheral side, the main shaft (2) so that the needle upper position detection plate (5) is on the inner peripheral side.
Are arranged concentrically with respect to. Needle position detection plate (5)
Is fixed to the pulley (3) by a setscrew (10) which is inserted through an elongated hole (3a) having an arc shape concentric with the main shaft (2). By the action of the elongated hole (3a), the needle upper position detection plate (5)
Can be arbitrarily adjusted in the rotational direction from outside the pulley (3). The needle down position detection plate (4) is sandwiched between the outer periphery of the needle up position detection plate (5) and the pulley (3),
The convex portion (4d) provided on the outer periphery of the pulley (3) is fitted into the concave portion (3b) of the pulley (3) so that the convex portion (4d) is unrotatably fixed in the circumferential direction.

The needle position detecting plate (4) has a needle position detecting through hole (4b) on the inner peripheral side and a rotational speed detecting through hole (4c) on the outer peripheral side.
And the surfaces excluding the through holes are mirror-like reflective surfaces (4
a). As shown in FIG. 13, a concave groove (3c) whose bottom surface is inclined with respect to the reflection surface (4a) is formed in a portion of the pulley (3) facing the through holes (4b) and (4c). Moreover, since it is colored black, it hardly reflects at the through holes (4b) and (4c).

(6a) is a needle position detector facing the through hole (5b),
(6b) is a needle position detector located opposite the through hole (4c) for detecting the needle lower plate, and (6c) is a rotation speed detector located opposite the through hole (4c) for detecting the rotational speed. Means and a light receiving means, and the presence or absence of the reflected light of the light emitted from the light projecting means is determined by the reflecting surfaces (4a), (5a) or the non-reflecting through hole (4).
b), (4c) and (5b) are detected by the light receiving means and a position detection signal is output.

The detectors (6a), (6b) and (6c) are printed circuit boards (9).
And is covered with a detector cover (7) except the light emitting surface and the light receiving surface of the detector. The detector cover (7) is screwed (11) through the cover retainer (8).
It is fixed to the bearing (1a) with.

[Problems to be Solved by the Invention] Since the conventional needle position detecting device is configured as described above, it is necessary to loosen the screw (10) to adjust the needle upper position detecting plate, and the adjusting work is complicated. Further, since the needle down position detection plate is non-rotatably fixed to the needle up position detection plate, it cannot be adjusted individually.

Further, since the through hole is used for the non-reflective surface, the pulley portion facing this through hole must be formed with a groove whose bottom surface is inclined with respect to the reflective surface and colored black. There is a problem in that it requires man-hours for processing and becomes expensive.

The present invention has been made to solve the above-mentioned problems of the conventional device, and when there is an annular body for position detection between a support body that supports a rotating shaft and a rotating body that is fixed and rotates on the rotating shaft. The position of the annular body for position detection can be easily adjusted without loosening the screw from the outside of the rotating main body, and the recessed groove and black coloring required in the pulley part facing the through hole are not necessary. It is intended to provide an excellent position detecting device.

[Means for Solving the Problems] In order to achieve the above object, a position detection device according to the present invention includes: (a) a shaft; (b) a support rotatably supporting the shaft; and (c) the above. A rotating body fixed to the shaft and having at least one hole of a predetermined shape penetrating in the axial direction, and (d) rotating with respect to the rotating body concentric with the shaft between the support and the rotating body. A plurality of annular bodies that are arranged so as to sandwich an impossible slide slope and have a radius on the rotor side larger than that on the support side, and (d1) are pressed against the rotor side to rotate with the rotor, d2) A position detection part is provided in a portion of the rotating body-side annular body that does not overlap with the supporting body-side annular body, and (d3) rotation is performed by applying a force through a hole of a predetermined shape formed in the rotating body. A plurality of annular bodies configured to be rotatable relative to the body; ) A position detector which is fixed to the support and detects the position of the rotating annular body.

Further, the position detecting portion is formed by coloring the surface of the above-mentioned annular reflecting material.

[Operation] In the position detecting device configured as described above, the annular body is first pressed against the rotating body, and the annular body is also rotated with the rotation of the rotating body. No screws are needed to secure it to the body. Further, since the annular body can be rotated by applying a force to the annular body through the hole formed in the rotating body, the position can be easily adjusted. Furthermore, since the sliding slope is sandwiched between the two annular bodies, the rotation of one annular body is not transmitted to the other when adjusting the position of each annular body.

Since the ring-shaped body was formed from a reflective material and the position detection portion was formed by coloring the surface of the ring-shaped material with black, the concave groove which was necessary when using the through hole was eliminated.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, (1) is a machine frame that serves as a support, and (2) is a main shaft that vertically moves a sewing machine needle, which is rotatably supported by the machine frame (1) via a bearing (1a). . (3) is a pulley which receives a transmission force from a motor (not shown) by a belt (not shown), which is fixed to the main shaft (2) and is attached to the main shaft (2).
Rotates integrally with. (4) and (5) are needle-down position detection plates and needle-up position detection plates, which are formed in a disk shape, and are located inside the sewing machine frame (1) side of the pulley (3). ) Is provided on the inside and the needle down position detection plate (4) is provided on the outside, and is rotatable with respect to the pulley (3). Reference numeral (20) is a sliding plate disposed between the needle upper position detection plate (5) and the needle lower position detection plate (4), and the tongue portion (20a) thereof is on the bald portion (3e) of the pulley (3). It fits and cannot rotate with the pulley (3).

(21) is a press load spring that presses the needle up-and-down position detection plates (5), (4) and the sliding plate (20) toward the pulley (3) side, and the needle up-down position detection plates ( 5) and (4) are pressed against the pulley (3) so as not to rotate. (22) is the needle up / down position detection plate (5),
(4) Slide plate (20) and preload spring (21)
The C-ring (23) for supporting the whole of them on the pulley (3) is an end plate for pressing the pulley (3).
It is located in.

(60) is a detector with a built-in light emitting / receiving means, (24) is a diode which is issued when power is supplied to a motor (not shown) or a control panel (not shown) for controlling the motor, At the protrusion (26) of the detector (60),
It is installed at a position where it can be easily seen by the operator when it is attached to the sewing machine frame (1). Reference numeral (7) denotes a mounting ear of the detector (60) to the sewing machine frame (1), which is held by the sewing machine frame (1) with a screw (11).

FIG. 2 is a view as seen from the pulley (3) side of the detector (60). (7a) is a long hole for the screw (11) formed in the mounting ear (7). When the machine is attached to the machine frame (1) of the sewing machine, the direction of rotation can be adjusted. (7b) is an angle scale formed integrally with the mounting ear so that the adjustment angle can be known. (6a) is a needle down position detector, (6b) is a needle up position detector, and (6c) is a rotation speed detector, each of which has a light emitting means and a light receiving means, and emits light according to the step of the reflecting surface. It is arranged at a position where the distance from the light to the light is the same.

Fig. 3 is a view of the needle position detecting plate (4) as seen from the machine frame side. (4b) is a reflecting surface for detecting the needle position, which serves as a position detecting unit. It is plated with chrome. (4a) is a non-reflective surface, and the surface is colored black by printing or the like. Reference numeral (4f) is an adjustment hole serving as a force adjusting portion provided for adjusting the rotation direction of the needle lower position detection plate (4) from the outside of the pulley (3). FIG. 4 is a view of the needle upper position detecting plate (5) seen from the machine frame side, and (5b) is a reflecting surface for detecting the needle upper position corresponding to the needle upper position serving as a position detecting portion, which is a transparent plastic. The back surface of the material is plated with aluminum, chrome, etc.
(5a) is a non-reflective surface, the surface of which is colored black by printing or the like. (5c) is a reflection surface for rotation speed detection corresponding to rotation speed detection, and (5f) is a force adjusting unit provided for adjusting the rotation direction of the needle upper position detection plate (5) from outside the pulley (3). This is the adjustment hole. (5e) is provided in correspondence with the adjustment hole (4f) that serves as a force adjusting portion of the needle down position detection plate (4), and the needle down position detection plate (4) can be adjusted from outside the pulley (3). It is a bite hole provided to do so.

FIG. 5 is a view of the sliding plate (20) viewed from the side of the sewing machine frame, and FIG. 6 is a view of the pulley (3) viewed from the side of the sewing machine frame. The tongue part (20a) of the sliding plate (20) is fitted to the bail part (3e) of the pulley (3), and the sliding plate (20) is the pulley (3).
And cannot be rotated.

FIG. 7 is a view seen from the outside of the pulley (3). (34) is a screw for fixing the pulley to the main shaft (2), (3a) is an adjusting hole (4f) of the needle down position detection plate (4). ) Corresponding to the pulley hole,
(3d) is a pulley hole corresponding to the adjusting hole (5f) of the needle position detecting plate (5). (3f) is the pulley hole (3
It is an angle scale for knowing the adjustment angle engraved in the vicinity of a) and (3b). (3g) is a needle up position / needle down position adjustment classification character for clarifying the adjustment classification engraved near the angle scale (3f).

The position detecting device according to the present invention is configured as described above. Therefore, the needle vertical position detection plates (5) and (4) can be adjusted without loosening the screw in order to adjust the rotation direction angle of the needle vertical position.
The adjustment holes (5f) and (4f) can be rotated from outside the pulley (3) through the pulley extraction holes (3a) and (3b). At this time, the needle vertical position detection plate (5)
Since the sliding plate (20) which is provided so as not to be rotatable with the pulley (3) is arranged between and (4), the rotational force of each position detecting plate is blocked by this sliding plate, When adjusting one of the position detection plates, the other position detection plate is not rotated. Further, to facilitate the angle adjustment, the jig shown in FIG. 8 may be used. Tip (25a) of angle adjustment jig (25)
The needle up-and-down position detection plates (5), (4) adjustment hole (5f),
The angle can be easily adjusted by inserting it in (4f).

Further, in order to clarify the classification of the needle up position and the needle down position adjustment, the characters for the needle up position and needle down position adjustment classifications are provided, but the angle scale may be color-coded.

In the above embodiment, the sliding plate (20), the preload spring (21), the end plate (22), the C ring (2
Although 3) is used, other members may be used.

Further, in the above-described embodiment, the light transmission / reception is used for position detection, but other methods may be used.

Further, the above embodiment is an example in which the present invention is applied to a needle position detecting device of a sewing machine, but not limited to the case of a sewing machine, the present invention is generally a position detecting device in which a position detecting member is arranged between a support and a rotating body. The same effect can be obtained by applying it to the device.

Further, the needle up / down detection plates (4) and (5) are made of a transparent plastic material by plating the back surface with aluminum, chrome, etc. to form a reflective material, but other reflective materials are used to color the surface to provide a non-reflective surface. May be formed.

EFFECTS OF THE INVENTION Since the position detecting device of the present invention is configured as described above, the following excellent effects can be obtained as compared with the conventional position detecting device.

(1) Since the annular body is pressed against the rotating body by a spring or the like, a screw for attaching the annular body to the rotating body is unnecessary, and the structure is simplified.

(2) Since the sliding plate is sandwiched between the two annular bodies, the rotation is not transmitted to the other even if one of the annular bodies is rotated.

(3) Since the circular body on the rotary body side is provided with a hole and the circular body on the support body side can be rotated through the hole, the position adjustment is individually performed even when there are a plurality of circular bodies. be able to.

(4) Since the position detecting portion on the annular body is colored black without using the through hole, the concave groove required in the case of the through hole is not required, which contributes to cost reduction of the device.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part showing a first embodiment of the present invention, FIG. 2 is a side view of a detector, FIG. 3 is a plan view of a needle down position detection plate, and FIG. 4 is a needle up position detection. FIG. 5 is a plan view of the sliding plate, FIG. 6 is a front view of the outside of the pulley, FIG. 7 is a front view of the inside of the pulley, FIG. 8 is a side view of the jig, and FIGS.
FIG. 13 shows a conventional device, and FIG.
FIG. 10 is a front view of a pulley, FIG. 11 is a front view of a needle down position detection plate and a needle up position detection plate, FIG. 12 is a front view of a detector cover, and FIG. 13 is a cross-sectional view showing a groove. . (1) is a machine frame, (2) is a spindle, (3) is a pulley,
(4) is the needle down position detection plate, (5) is the needle up position detection plate,
(60) is a detector, (7) is a mounting ear, (20) is a slip slope,
(21) is preload spring, (22) is end plate, (23)
Is a C ring, (3a) and (3d) are pulley holes, (3f) is an angle scale, (4a) is a non-reflective surface, (4b) is a reflecting surface for detecting the needle down position, (4f) is an adjusting hole, (5a) is a non-reflecting surface, (5b) is a reflecting surface for detecting the needle position, (5c) is a reflecting surface for detecting rotational speed, (5f) is an adjusting hole, and (5e) is a bite hole. The same reference numerals in the drawings indicate the same or corresponding parts.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Takashi Nakamura 5-1-14 Yataminami, Higashi-ku, Nagoya-shi, Aichi Mitsubishi Electric Corporation Nagoya Works (56) Reference JP-A-2-168988 (JP, A)

Claims (2)

[Claims] 1. A shaft comprising: (a) a shaft; (b) a support for rotatably supporting the shaft; (c) at least one hole having a predetermined shape fixed to the shaft and penetrating in the axial direction. (D) is disposed concentrically with the shaft between the supporting body and the rotating body, with a non-rotatable sliding slope being sandwiched between the rotating body side and the supporting body side. A plurality of larger annular bodies that are (d1) pressed toward the rotating body so that they can rotate together with the rotating body, and (d2) on a portion of the rotating body-side annular body that does not overlap with the support-side annular body. A position detector is provided, and (d3) a plurality of annular members configured to be rotatable relative to the rotating body by applying a force through a hole of a predetermined shape formed in the rotating body. A body, and (e) a position detector that is fixed to the support and detects the position of a rotating annular body. Position detecting apparatus characterized by including. 2. The position detecting device according to claim 1, wherein in the annular body of the position detecting device, the surface of the reflective material is colored to form the position detecting portion.