JPH0261456A - Rotation controller - Google Patents

Abstract

PURPOSE:To enable the rotation control of a rotating body to be effected accurately in a small space by providing two protrusions different in length on the rotating body for an outlet duct and the like in a spot cooler and providing two limit switches in superimposition with each other. CONSTITUTION:A power from the driving source of a driving means 4 is transmitted through a belt transmission mechanism to a rotating body 51 interconnected with an outlet duct 16 of a spot cooler and rotates the rotating body 51. If two limit switches 7a and 7b detect a first protrusion, the driving means 4 is controlled by signals from the limit switches 7a and 7b to invert the rotation of the rotating body 51. If one of the limit switches 7a and 7b detects a second protrusion, the driving means 4 is controlled by a signal released out of the limit switch 7b to reinvert the rotation of the rotating body 51. Thus, the rotating body 51 is reciprocatingly rotated by the signals from both limit switches 7a and 7b to effect the oscillation of the outlet duct 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotation control device for controlling rotation of a rotating body such as a blow-off duct in a spot cooler within a predetermined range.

(Prior Art) In general, spot coolers for local cooling are being installed in various factories to improve the working environment. This spot cooler uses Utility Model 61-101333.
As disclosed in the publication, a refrigerant circuit equipped with a compressor, a condenser, an evaporator, and an expansion mechanism is housed in a housing mounted on a wagon, and a condensing fan and an evaporating fan are also housed. In some systems, the cold air that has undergone heat exchange in the evaporator is blown out toward the worker from a blow-off duct connected to the upper part of the housing, thereby providing local cooling.

Further, the blow-off duct is connected to a swing cylinder, which is pivotally supported by the housing by a diametrical pin, and is connected to a motor via a link mechanism. Then, the motor is driven to swing the blow-off duct to ensure cooling over a wide range.

(Problems to be Solved by the Invention) In the spot cooler described above, since the blowout duct is swung around a pin, a bellows is provided between it and the housing for sealing, but the sealing performance against dew condensation etc. is poor. There was a problem with it being bad. In addition, a link mechanism, etc. must be installed inside the housing due to seals, etc., and the link mechanism and pivot pin of the swing tube are located in the cold air passage, increasing ventilation resistance and reducing cooling efficiency. There was a problem.

Therefore, while a rotary tube is provided in the housing so as to be rotatable around the axis, a motor is provided outside the housing, the motor and the rotary tube are connected, and a blow-off duct is connected to the rotary tube. It is possible to rotate the

At this time, in order to control the blow-off duct within a predetermined rotational range, a limit switch is provided close to the rotary cylinder, and the protrusion detected by the limit switch is set on the outer circumference of the rotary cylinder in accordance with the rotation restriction position. It is necessary to provide it on the surface. If one limit switch is provided, but a protrusion is provided at each limit position on both sides to control the rotation, the rotation will stop when the limit switch is in contact with either protrusion, and then restart. At this time, it is unclear which protrusion the rotary cylinder is in contact with, and the direction of rotation of the rotary cylinder cannot be determined, resulting in a problem that accurate control cannot be performed.

In addition, if one protrusion is provided on the rotary tube, and a limit switch is provided at each limit position on both sides to control the rotation, it will require installation space for two separate limit switches, which is disadvantageous in terms of space. There's a problem.

The present invention has been made in view of these points, and by providing two protrusions of different lengths on the rotating body and superimposing two limit switches, accurate rotation control can be achieved in a small space. The purpose is to make it possible to do the following.

(Means for Solving the Problems) In order to achieve the above object, the means taken by the invention according to claim (1) first include a support substrate (3) as shown in FIGS. 1 to 5. A rotating body (51) having a circular outer circumferential surface and rotatably supported is provided. Then, the rotating body (51
) for driving the rotating body (51) in forward and reverse directions. Furthermore, the rotating body (51
), which are superimposed in parallel with the axial direction of the rotary body (51), and detect the limit positions on both sides in the rotation range of the rotary body (51) to control the driving means (4). Limit switch (7a) and second limit switch (7b)
) is provided. In addition, both limit switches (51) are formed on the outer circumferential surface of the rotating body (51), extending in the axial direction of the rotating body (51) and located at one end of the rotation range.
7a), the first protrusion (62) detected by (7b),
A projection (62) is formed on the outer peripheral surface of the rotating body (51), extending in the axial direction of the rotating body (51), located at the other end of the rotation range, and shorter than the first protrusion (62). 7a), (7b) only detects the second
A projection (63) is provided.

Moreover, the means taken by the invention according to claim (2) is that the invention according to claim (1) is applied to the spot cooler (1), and the blow-off duct (16) is connected to the rotating body (51). There is.

In addition, the measures taken by the invention according to claim (3) are
In the invention of item 1) or (21), the drive means (4) is configured by connecting a belt transmission mechanism (43) to a drive source (41), and a belt (47) of the belt transmission mechanism (43).
) are formed on the outer circumferential surface of the end of the rotating body (51).

(Function) With the above configuration, in the invention according to claims (1) to (3), for example, the outlet duct (16) of the spot cooler (1)
The rotating body (51) connected thereto is rotated by the power of the drive source (41) of the drive means (4) being transmitted via the belt transmission mechanism (43). When both limit switches (7a) and (7b) detect the first protrusion (62), both limit switches (7a).

(7b) controls the driving means (4) to reverse the rotating body (51), while the limit switch (7b) is reversed.
When one of a) and (7b) detects the second protrusion (63), the driving means (
4) to reverse the rotating body (51) again. The signals from both limit switches (7a) and (7b) cause the rotating body (51) to reciprocate and swing the blow-off duct (16).

(Effect of the invention) Therefore, according to the invention according to claim (1), the two limit switches (7a), (7b) arranged in an overlapping manner and the two protrusions (62), (63) having different lengths Since the rotation of the rotating body (51) is controlled, both end positions of the rotation range are controlled by both limit switches (7a) and (7b).
) and the output of only one limit switch (7b), accurate control can be performed. Also, the limit switch (7a).

(7b) are provided one on top of the other, the installation space can be reduced, and the entire device can be made compact.

Further, in the invention according to claim (2), since the blow-off duct (16) is connected to the rotating body (51), the swinging control of the blow-off duct (16) can be performed accurately. Since there is no link mechanism or the like located in the air passage like in the past, ventilation resistance is small and air conditioning efficiency can be improved, and since there is no need to provide bellows, a reliable seal can be achieved. . Since there is no link mechanism or the like located in the air passage like in the past, ventilation resistance is small and air conditioning efficiency can be improved, and since there is no need to provide bellows, a reliable seal can be achieved. .

Furthermore, in the invention according to claim (3), the rotating body (51
) is formed with teeth (51d), but both protrusions (6
2) and (63) overlap in the circumferential direction, the rotating body (51) can be integrally molded and can be easily molded.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

As shown in FIGS. 8 and 9, (1) is a spot cooler, which is installed in various factories, etc., and is designed to locally cool workers and the like by blowing cold air onto them.

The spot cooler (1) is configured to be movable by mounting a cooler body (12) on a wagon (11) having casters (11a), and the wagon (11) has an upper part (
It is formed in two stages: a lower part (11b) and a lower part (11c). The cooler main body (12) is a compressor (12a).
), a condenser (12b), and an evaporator (12c) are connected by cold piping to a refrigerant circuit (not shown), and the compressor (12a) is connected to the lower part (11) of the wagon (11).
c), the lower part (11c) of the wagon (11)
In addition to the compressor (12a), a drain tank (13), an electric box (14), etc. are attached to the.

A main body housing (15) of the cooler main body (12) is provided in the upper part (1l b) of the wagon (11), and the above-mentioned condenser (12b) and the main body housing (15) are provided on both sides of the main body housing (15). An evaporator (12c) is provided, and
In the center, there is one electric motor (12d) and a condensing fan (1
2e) and an evaporation fan (12f) are connected and housed.

Furthermore, the top plate (15a) of the main body housing (15)
A condensing side exhaust port (15b) is opened at the evaporation fan (12f), and a blowout duct (16) is installed via the simultaneous control device (2). (12g) via the top plate (15a) of the main body housing (15). The air flowing in from the side of the main body housing (15) by driving the fans (12e) and (12f) is transferred to the condenser (
12b) to exchange heat and become hot air, which is discharged upward from the exhaust port (15b), while air flowing in from the other side of the main body housing (15) undergoes heat exchange in the evaporator (12c) and becomes cold air. The air is configured to be blown out from a blow-off duct (16) toward workers and the like.

In addition, (17) is a drain pan provided at the lower part of the evaporator (12c), and is communicated with the drain tank (13) to transfer the drain from the evaporator (12c) to the drain tank (17).
13).

As shown in FIGS. 1 and 2, the rotation control device (2) includes a top plate (15a) of the main body housing (15).
A drive mechanism (4), which is a drive means, and a rotation mechanism (5) are housed in a casing (3), which is a support board attached to the casing (3).

The casing (3) is formed into a flat box body with an open bottom surface, with the cold air blowing side (A side in Figure 2) as the front, and the rear (right side in Figure 2) and left and right sides in the right half of Figure 2 when viewed from above. a rear side wall (31) that is flat on both sides (upper and lower sides in Figure 2);
A drive mechanism storage section (21) surrounded by a left side wall (32) and a right side wall (33), and a rotating mechanism surrounded by a substantially semicircular front side wall (34) in the left half of FIG. A storage section (22) is formed. Furthermore, each side v (31), (3
2) There is a top wall (35) at the top end of (33) and (34).
are formed continuously, and the left, right and front side walls (
32), (33), and (34) have flanges (
3a) is bent into an L-shape, and the casing (3) is fixed to the main housing (15) at the flange (3a).

An opening (35a) through which the rotation mechanism (5) passes is bored in the front part of the upper wall (35), and the opening (35a)
is adjacent to the front side wall (34).
It is formed into a perfect circle concentric with the center of curvature. Further, a guide wall (36) for the rotation mechanism (5) is formed on the inner surface (lower surface) of the upper wall (35) so as to protrude slightly downward.

The guide wall (36) is formed in a substantially semicircular shape centered on the center of curvature of the front side wall (34) adjacent to the opening (35a), and is continuous with the front side wall (34). 3
6) and the upper end of the front side wall (34).
) constitutes an annular guide portion (37). In addition, each of the side walls (31), (32), (33), (34) and the guide wall (36) has a drive mechanism (4) and a rotation mechanism (5).
A plurality of fixing columns (38), (38), . . . for fixing the lower receiving plate (23) and the motor mounting plate (24) are continuously formed. Each fixed pillar (38), (38
).

... has a screw hole that opens on the bottom surface, and
The lower surface is formed so as to be located slightly above the lower end of the casing (3). And the lower receiving plate (23)
As shown in Figure 7, there is an evaporation fan (12f).
An opening 0 (23a) communicating with the discharge port is bored,
The opening (23a) is the opening (35a) in the upper wall (35).
), and an annular folded piece (23b) is formed in an L-shape by being bent upward at the periphery of the opening (23a) of the lower receiving plate (23).

As shown in FIG. 6, the drive mechanism (4) includes a geared motor (41) connected to a power transmission mechanism (4a) consisting of a worm gear (42) and a belt transmission mechanism (43). ) is a drive shaft (41b
) is configured to protrude, and the motor body (41a) is fixedly supported by the motor mounting plate (24). Further, in the geared motor (41), the drive shaft (41b) is horizontally installed parallel to the top wall (35) and parallel to the rear side wall (31), and the thickness of the motor body (41a) (in the vertical direction in FIG. The height of the casing (3) is formed corresponding to the height of the casing (3). The motor main body (41a) has one end surface and -
The side surface is provided close to the left side wall (32) and the rear side wall (31), and the rearmost protrusion of the guide wall (36) is provided close to the side surface of the motor body (41a).

The worm gear (42) is a cylindrical worm (42).
a) is fitted and fixed to the drive shaft (41b), and
A worm wheel (4) meshing with the worm (42a)
2b) utilizes the gap created by the semicircular guide wall (36) and the flat right side wall (33) to move the shaft (44)
). The shaft (44) is supported in the vertical direction by an upper support plate (45) and a lower support plate (23) fixed to the right side wall (33) via bearings (44a), (44a). , the worm wheel (42b) is fixed to the upper part.

Furthermore, the shaft (44) has a flange (44) at its lower end.
4b) is formed, and the timing pulley (46) of the belt transmission mechanism (43) is fitted onto the flange (44b). The timing boo 9 (
The toothed belt (47) is formed with teeth on its outer peripheral surface.
) is written, and a recess (46a) is formed in the inner peripheral portion. The recess (46a) is open on the upper surface, and a compression spring (48) is interposed between the recess (46a) and the worm wheel (42b).
The timing pulley (46) is pressed against the flange (44b) of the shaft (44) by the spring force of 8), and the timing pulley (46) is slidably fitted onto the shaft (44).

On the other hand, the rotation mechanism (5) includes a rotating cylinder (5) which is a rotating body.
1) through the elbow (52) to the above-mentioned blow-off duct (16)
The rotary cylinder (51) is connected to the rotary cylinder main body (5
1a) is formed into a straight cylindrical shape, and the rotary cylinder main body (51
The upper part of a) is fitted into the annular guide part (37), and the lower part is the folded piece G23b of the lower receiving plate (23).
It is fitted externally and supported in the vertical direction. The opening (3
An annular extension piece (51b) facing 5a) is continuously formed upward, while a band-shaped projection (51c) is formed on the upper outer circumferential surface and a southern part (51d) is formed on the lower outer circumferential surface. The belt (47) of the belt transmission mechanism (43) is written in (51d) so that the rotary cylinder (51) is rotated by the drive of the geared motor (41).

Further, the upper end surface and the upper wall (3
5), and a lower thrust sheet (53) between the lower end surface and the lower receiving plate (23).
4) are interposed, and the rotary cylinder main body (51a) is pressed upward by the spring force of the lower receiving plate (23), so that both upper and lower end surfaces are sealed. Further, an upper radial seam (55) is sandwiched between the upper thrust sheet (53) and the band-shaped projection (51c) between the upper outer circumferential surface of the rotary cylinder main body (51a) and the annular guide part (37). A lower radial sheet (56) is interposed between the inverted letter-shaped notch on the inner peripheral surface of the lower portion and the folded piece (23b).

Furthermore, three mounting flanges (57) for fixing the elbow (52) are provided on the upper inner circumferential surface of the rotary cylinder main body (51a).
, (57), (57) are protruded, and the mounting flanges (57), (57).

(57) are provided at uneven intervals, and the front mounting flanges (57) are provided at irregular intervals.
7), the left mounting flange (57), the front mounting flange (57), and the right mounting flange (57) are the rotating cylinder (51).
), and the left mounting flange (57) and the right mounting flange (57) are set at 100 degrees.

The elbow (52) extends obliquely forward and upward from the rotary tube (51), has a lower end fitted into the annular extension piece (5l b) of the rotary tube (51), and has a blowout duct ( 16) are fitted.

The lower inner circumferential surface of the elbow (52) is provided with mounting flanges (57), (57) (57) for the rotating cylinder (51).
) corresponding to three fixed columns (58).

(58), (58) are bulged and the fixed column (58)
, (58), (58) and mounting flange (57),
(57), (57) are fixed with screws or the like, and the above-mentioned blow-off duct (16) is connected to the rotating cylinder (51).

On the other hand, on the guide wall (36), as shown in FIG.
A notch (6) is formed in the lower part, and a stopper (61) facing the notch (6) is projected on the upper outer circumferential surface of the rotary cylinder main body (51a). Both end surfaces of the notch (6) are stop surfaces (61a) against which the stopper (61) comes into contact.
, (61a), and the notch (6) and the stopper (
61) and the rotating cylinder (51), that is, the blow-off duct (
16) is forcibly restricted, and its rotation range is set to, for example, 110 degrees.

Further, in front of the motor body (41a), a first limit switch (7a) and a second limit switch (7b) are provided for regulating the automatic swing range of the blow-off duct (16). Both limit switches (7a), (7
b) is composed of a micro switch, etc., and is provided using a gap created between the semicircular guide wall (36) and the flat left side wall (32), and
The support piece (72) is attached to the support piece (72) connected to the support piece (72) so as to be superimposed in two stages, upper and lower. Then, each of the above limit switches (7a
), (7b) probe (71a).

(71b) is provided so as to be in contact with the outer circumferential surface of the rotary cylinder main body (51a) below the stopper (61) at two locations, upper and lower.

On the other hand, as shown in FIGS. 4 and 5, the probe (71a) is provided on the outer circumferential surface of the rotary cylinder main body (51a).
, (71b) contact the first protrusion (62) and the second protrusion (
63) is provided.

Both protrusions (62) and (63) are formed in the axial direction (vertical direction) from above the teeth (51d) of the rotary cylinder body (51a), and the first protrusion (62) is connected to the blowout duct (16).
), the second protrusion (63
) are provided at the right end limit position. Further, the first protrusion (62) is formed longer downwardly than the second protrusion (63), and the first protrusion (62) is longer than the second protrusion (63).
).

The second protrusion (63) is connected to the second limit switch (7b) so that the probes (71a) and (71b) come into contact with it.
b) are formed so that only the probe (7l b) comes into contact with both limit switches (7a),
The geared motor (41) is controlled in forward and reverse directions by (7b), and the blow-out duct (16) is configured to swing, and the range of automatic swing is slightly smaller than the range of rotation caused by the notch (6), for example. , is set to 100 degrees.

Next, the cooling operation of this spot cooler (1) will be explained.

First, move the wagon (11) and install the spot cooler (1).
) is installed in a cooling area, and when the compressor (12a) and each fan (12e), (12f), etc. The exchanged hot air is discharged from the exhaust port (15b), while the cold air that has undergone heat exchange in the evaporator (12c) is blown out from the blow-off duct (16) towards the workers, etc., thereby providing local cooling.

During this cooling, in addition to stopping the guard motor (41) and setting the blow-off duct (16) to a fixed state, the guard motor (41) is driven to set the blow-off duct (16) to an automatic swing state.

Therefore, this automatic swinging operation will be explained.

When the geared motor (41) is driven, the drive shaft (4
The rotation of 1b) is transmitted to the shaft (44) via the worm (42a) and the worm wheel (42b), causing the shaft (44) to rotate. Then, the shaft (4
A timing pulley (46) is attached to the flange (44b) of 4).
) is pressed by the spring (48), the timing pulley (46) rotates with the rotation of the shaft (44), and this rotation is transmitted to the rotating tube (5) via the belt (47).
1), and the rotary cylinder (51) rotates around its axis.

Subsequently, when the rotating barrel (51) rotates, the rotating barrel (51) rotates.
The first protrusion (62) and the second protrusion (6) formed on the
3) also rotates, and the first protrusion (62)
Since it is longer than the protrusion (63), when the Ts1 protrusion (62) is rotated to a predetermined position, both limit switches (7a).

The probes (71a) and (71b) of (7b) come into contact with each other, and both limit switches (7a) and (7b)
The left end position of the swing range is detected by the signal, the geared motor (41) is reversed, and the rotary cylinder (51) is rotated counterclockwise in FIG.

Thereafter, when the second protrusion (63) rotates to a predetermined position, the second protrusion (63) moves to the second limit switch (7b).
) is in contact with the probe (71b), the right end position of the swing range is detected by the signal of the second limit switch (7b), the geared motor (41) is reversed, and the rotating cylinder (
51) rotates in the clockwise direction in FIG.

By repeating this operation, the rotary cylinder (51) reciprocates within a predetermined range (for example, 100 degrees), and the above-mentioned blow-off duct (16)
) will automatically perform a swinging motion. The cold air then passes through the rotary tube (51) from the evaporation fan (12f), passes through the elbow (52) and the blow-off duct (16), and is blown out within the swing range.

In addition, when the blow-off duct (16) is fixed or swung, if an operator or the like forcibly rotates the blow-off duct (16), the stopper (61) will move against both stop surfaces (6) of the notch (6).
a), (6a), and when the stopper (61) comes into contact with the stop surface (6a), the rotation of the blow-off duct (10) is forcibly restricted. At that time, the timing pulley (46) rotates via the belt (47) as the blow-out duct (16) is forced to rotate.
Since it is pressed by the shaft (44), it will idle relative to the shaft (44).

On the other hand, when assembling the rotary tube (51), the stopper (61) is made to face the notch (6).
1) is assembled accurately to the casing (3), and the spacing of the mounting flanges (57) is different, so
The elbow (52) and the air outlet duct (16) are connected to a rotating cylinder (
51).

Furthermore, the lower receiving plate (23) has a spring force, and the rotating cylinder (23) has a spring force.
51) in the axial direction (upward), the upper and lower thrust sheets (53) and (54) rotate r? 1(
51) are sealed at the upper and lower ends.

Therefore, since there is no link mechanism or the like located in the air passage as in the past, ventilation resistance is small and air conditioning efficiency can be improved, and since there is no need to provide a bellows, a reliable seal can be achieved. .

In addition, two limit switches (7a) arranged in an overlapping manner
, (7b) and two protrusions (62) of different lengths,
Since the rotation of the rotary cylinder (51) is controlled by (63), both end positions of the swing range of the blow-off duct (16) are determined by the output of both limit switches (7a) and (7b) and the limit of only one. Since it can be accurately determined based on the output of the switch (7b), accurate control can be performed. In addition, the above limit switch (7a)
.

(7b) are provided one on top of the other, the installation space can be reduced, and the entire device can be made compact.

Furthermore, although the tooth portion (51d) is formed on the rotary tube (51), since both protrusions (62) and (63) overlap in the circumferential direction, the rotary tube (51) cannot be integrally molded. ,
Can be easily molded.

Although the spot cooler (1) has been described in this embodiment, the present invention may be applied to control of various rotating bodies provided in other air conditioners.

Furthermore, the limit switches (7a) and (7b) are not limited to microswitches.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of the rotation control device, and FIG. 2 is a sectional view taken along the line 1-1 in FIG. 1.
Ti Figure 3 is a cross-sectional end view of the main part taken along line ■-■ in Figure 1, Figure 4 is a cross-sectional end view of the important part taken along line ■-■ in Figure 1, and Figure 5 is a cross-sectional end view taken along line IV-IV in Figure 1. FIG. 6 is a cross-sectional end view of the main part, and FIG. 6 is a cross-sectional view taken along the line V-V in FIG. FIG. 7 is a bottom view showing the lower receiving plate, FIG. 8 is a front sectional view of the spot cooler, and FIG. 9 is a side sectional view thereof. (1) Spot cooler, (2) Rotation control device, (3) Casing, (4) Drive mechanism,
(4a)...power transmission mechanism, (5)...rotation mechanism,
(7a)...first limit switch, (7b)...
Second limit switch, (12a)...Compressor, (1
2b)--Condenser, (12C)--Evaporator, (12
e) Condensation fan, (12f) Evaporation fan, (41) Guard motor, (42) Worm gear, (43) Belt transmission mechanism, (47)
... Belt, (51) ... Rotating cylinder, (51d) ...
・Tooth portion, (62)...first protrusion, (63)...second
Protrusions, (71a), (71b)...probes. Patent applicant Daikin Industries, Ltd. Representative Patent attorney 1) Hiroshi and 2 others 1 (Zu Saini and Ntoku 7)

Claims (3)

[Claims] (1) A rotating body (51) with a circular outer peripheral surface rotatably supported by the support substrate (3), and a driving means (51) connected to the rotating body (51) for driving the rotating body (51) in forward and reverse directions. 4) is installed close to the rotating body (51) and superimposed in parallel with the axial direction of the rotating body (51), and detects the limit positions on both sides in the rotation range of the rotating body (51) and drives the rotating body. a first limit switch (7a) and a second limit switch (7b) for controlling the means (4); A first protrusion (62) formed at one end and detected by both limit switches (7a) and (7b); a second protrusion (63) that extends in the direction, is located at the other end of the rotation range, is shorter than the first protrusion (62), and is detected by only one of the limit switches (7a) and (7b); A rotation control device comprising: (2) A cylindrical rotating body (51) rotatably supported by the casing (3) of the spot cooler (1) and connected to the blow-off duct (16); Blowout duct (16)
a driving means (4) for swinging the rotating body (5);
1), which are superimposed in parallel with the axial direction of the rotary body (51), and which detect the limit positions on both sides in the swing range of the blow-off duct (16) to control the drive means (4). A first limit switch (7a) and a second limit switch (7b) are formed on the outer peripheral surface of the rotating body (51), extending in the axial direction of the rotating body (51) and located at one end of the swing range. is,
The first protrusion (62) detected by the limit switches (7a) and (7b) and the outer peripheral surface of the rotating body (51) extend in the axial direction of the rotating body (51) and are located on the other side of the oscillation range. A second protrusion (63) located at the end and shorter than the first protrusion (62) and detected by only one of the limit switches (7a) and (7b). Rotation control device. (3) The drive means (4) is constructed by connecting a belt transmission mechanism (43) to a drive source (41), and has teeth (51) with which the belt (47) of the belt transmission mechanism (43) meshes.
The rotation control device according to claim 1 or 2, characterized in that d) is formed on the outer circumferential surface of the end portion of the rotating body (51).