JP2004084784A - Slip mechanism and cursor slip mechanism for height meter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cursor slip mechanism for a height meter which prevents the excessive force to be applied to a motor and connected parts even if the force is accidentally applied. <P>SOLUTION: In this slip mechanism, one end of a hollow shaft 21b is provided with a solid male screw part 21c, and the other end of the hollow shaft 21b is provided with a doughnut-like flange part 21a at a right angle against the hollow shaft 21b. A cylindrical rubber pulley 22 having the axial length longer than the axial length of the hollow shaft 21b is loosely fitted in the hollow shaft 21b freely to rotate each other. A doughnut-like presser plate 23 is inserted into the male screw part 21c, and arranged in the rubber pulley 22 on a side opposite to the flange part 21a, and a presser spring 24 is inserted into the male screw part 21c to make it abut on the presser plate 23, and a nut 26 is screwed to the male screw part 21c to adjust the spring force of the spring 24. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cursor automatic driving mechanism in a height meter, and more particularly to a cursor slip mechanism of a height meter that suppresses overload when the cursor is automatically moved up and down.
[0002]
[Prior art]
In a conventional automatic height meter, the mechanism for automatically moving the cursor up and down is to attach a pulley to the motor, stretch a string between the pulley rotatably provided at the upper end of the pillar and the pulley of the motor, and drive the motor. The string is circulated between the two pulleys, and the cursor fixed to the string is moved up and down accordingly.
[0003]
A contact plate that can move up and down within a predetermined size range is provided at a position where the cursor comes into contact with the top of the person's head, and the contact plate moves upward at a position close to the contact plate. A limit switch that is turned on when the operation is performed is provided, and an ON signal of the limit switch is output to the control unit. As a result, the cursor is lowered to bring the contact plate into contact with the top of the person to be measured, and this position is detected to determine the height value. At the time when the contact plate contacts the top of the person and the limit switch is turned on, the drive motor is mechanically or electrically braked to stop the descending operation of the cursor. I have.
[0004]
[Problems to be solved by the invention]
When the cursor moves up and down or stops, force may be applied to the cursor by mistake. At that time, an excessive load is applied to the drive motor and the parts connected to the cursor. This would damage the drive motor and related components and would be desirable to avoid.
[0005]
An object of the present invention is to provide a cursor slip mechanism for a height meter that prevents an excessive force from being applied to a motor and components connected to the cursor even if a force is applied to the cursor by mistake in view of such a problem. It is to be.
[0006]
[Means for Solving the Problems]
The present invention employs the following solution in order to achieve the above object.
(1) In the slip mechanism, a solid male screw portion is provided at one end of the hollow shaft, and a donut-shaped flange portion is provided at the other end of the hollow shaft at right angles to the hollow shaft. A cylindrical rubber pulley having a long axial length is loosely fitted to the hollow shaft so as to be rotatable with each other, and a donut-shaped pressing plate is inserted into the male screw portion and arranged on the opposite side of the rubber pulley from the flange. Then, a holding spring is inserted into the male screw portion to abut the holding plate, and a nut is screwed into the male screw portion to adjust the spring force of the holding spring.
(2) In the cursor slip mechanism of the height meter, a motor shaft is fitted and locked to the hollow shaft of the rubber pulley in the slip mechanism according to (1), and a loop-shaped wire is loopably wrapped around the rubber pulley. A cursor is locked to the wire.
(3) In the cursor slip mechanism of the height meter according to the above (2), a pulley other than the rubber pulley over which the loop-shaped wire is wound is pivotally supported on one end of a column in the height meter.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a cursor slip mechanism in a height meter according to the present invention will be described below with reference to the drawings.
[0008]
(First embodiment)
FIG. 1 is a partially broken sectional view showing a state in which a cursor slip mechanism is incorporated in a column of a height meter.
[0009]
FIG. 1A shows a left side view of FIG. 1B in which a portion corresponding to the front side of the upper support 47 is deleted.
[0010]
FIG. 1B is a left side view in which a portion corresponding to the front side of the upper support 47 is deleted.
[0011]
FIG. 1C is a cross-sectional view taken along line CC of FIG. 1B.
[0012]
The height meter mainly includes a footrest 60, a lower support 40, and an upper support 47, as shown in FIG.
[0013]
The footrest 60 can also be used as a weight scale, a fat scale, and the like.
[0014]
The lower support 40 mainly includes a thin-walled cylinder having a rounded corner when viewed in cross section, and a bearing 42 provided with a lock mechanism and the like.
[0015]
A bearing 42 whose cross section is shown in FIG. 1C is fixed to the inside of the upper end side of the lower support 40.
[0016]
As shown in FIG. 1C, the upper support 47 is formed of a thin cylindrical body having rounded corners, and slides inside the bearing portion 42. As shown in FIG. 1C, a hole through which a locking member or the like of a lock mechanism is inserted is provided in the lower side of the upper support 47, and as shown in FIG. As shown in b), a slit 48 is provided in which the connecting portion 56 of the slider 54 slides.
[0017]
A mechanism for moving the cursor 70 up and down is housed in the upper support 47.
[0018]
As shown in FIGS. 1C and 1A, the driving motor 10 is mounted on the inner wall of the upper column 47 upward by a rail 58 and a mounting plate 14 having a substantially E-shaped cross section. The rail 58 has rail grooves 59 for the rollers 57 shown in FIG. 1A at the ends of both outer plate portions having a substantially E-shaped cross section, and is attached to the inner wall of the upper support 47 by attachment screws.
[0019]
As shown in FIG. 1B, the slider 54 rotatably guided and supported by two rollers 57 on the left and right sides so as to sandwich the rail 58, the connecting portion 56 of which passes through the slit 48 of the upper column 47. , Are connected to the cursor 70.
[0020]
The cursor 70 is composed of a cursor (ring-shaped portion) 70a surrounding the periphery of the upper support 47 and a cursor (horizontal bar portion) 70b in contact with the head. The cursor 70 is provided with a sensor (not shown) for operating the motor 10 for moving the cursor 70 up and down by detecting that the lower side of the cursor has touched the head.
[0021]
As shown in FIG. 1B, an upper pulley 52 is rotatably supported at one end of the rail 58 in parallel with the surface of the rail 58. A lower pulley 51 is rotatably supported by the lower mounting bracket 43 so as to change the direction of the wire 30 moving parallel to the rail 58 by 90 degrees.
[0022]
A slip mechanism is attached to the shaft of the motor 10. A rubber pulley 22 shown in FIG. 1A is attached to this slip mechanism.
[0023]
The wire 30 is looped around the rubber pulley 22 and the upper pulley 52, and is turned by 90 degrees by the lower pulley 51.
[0024]
The wire 30 is connected to a slider 54 by a wire fixing part 53.
[0025]
In this state, when the wire 30 is driven by the motor 10, the cursor 70 moves up or down.
[0026]
FIG. 2 shows the motor 10 as a drive source and the pulley with an overload prevention mechanism directly attached to the shaft 17 of the motor 10 in FIG. 1 described above. FIG. 2B shows a top view of the motor with a pulley. FIG. 2C shows a side view of the motor with a pulley. FIG. 2A shows an irregular sectional view obtained by adding a plan view of the motor case 11 to a sectional view cut along a plane including the center line of the shaft. FIG. 2D is a left side view of FIG. 2C as viewed from the left side of the drawing. FIG. 2E is a right side view of FIG. 2C viewed from the right side of the drawing. FIG. 2F is a diagram illustrating a difference G in the axial length between the rubber pulley 22 and the hollow shaft 21b of the shaft 21.
[0027]
The motor 10 is fixed to a motor case 11 via a rubber bush 16 by screws 15 on a rubber plate 13 and an attachment plate 14 having an opening through which a bearing 18 of a motor shaft 17 is inserted and supported.
[0028]
The rubber bush 16 is formed in two stages in cross section. The first stage can be inserted into the opening of the mounting plate 14, and the second stage has a larger diameter than the opening to have a retaining structure for the mounting plate 14. The motor shaft 17 is rotatably supported by a bearing 18.
[0029]
The control device (not shown) and the operation device (not shown) of the motor 10 are provided on the height meter itself or separately therefrom.
[0030]
(Slip mechanism)
The slip mechanism of the present invention is attached to the motor shaft 17. This slip mechanism is generally applicable without limiting the application.
[0031]
The shaft 21 is made of metal, with a solid male screw portion 21c provided at one end of the cylindrical hollow shaft 21b on the basis of the cylindrical hollow shaft 21b, and the hollow shaft 21b at the other end of the hollow shaft 21b. A donut-shaped flange 21a is provided at a right angle.
[0032]
As shown in FIG. 2 (f), the rubber pulley 22 is formed in a cylindrical shape having an axial length longer by an arbitrary length G than the axial length of the hollow shaft 21b, and the rubber pulley 22 is mutually rotated by the hollow shaft 21b. It is loosely fitted. The rubber pulley 22 can change elastic force, viscosity, and the like. On the outer surface of the rubber pulley 22, a groove 22a for guiding the wire 30 is formed. When the presser plate 23 is pressed by the presser spring 24 until the presser plate 23 contacts the left end surface of the hollow shaft 21b (until the gap G becomes zero), the rubber pulley 22 is compressed and the friction applied to the flange portion 21a, the presser plate 23 and the hollow shaft 21b. The resistance is at its maximum. This maximum value is determined by design specifications. The left end surface of the hollow shaft 21b constitutes a limiter for frictional resistance applied to the rubber pulley 22.
[0033]
The holding plate 23 is made of wear-resistant metal and has a donut-shaped plate-like structure. The pressing spring 24 has a structure in which a linear spring is wound up in a conical shape, and the elastic pressure changes according to the degree of deformation during the entire shape changes from a steady state conical shape to a crushed disk shape. Has become.
[0034]
The nut 26 has a two-piece tightening structure to prevent loosening due to vibration.
[0035]
When these parts are assembled, a donut-shaped holding plate 23 is inserted through the male screw portion 21c and arranged on the side opposite to the flange portion 21a of the rubber pulley 22, and a holding spring 24 is inserted through the male screw portion 21c. A nut 26 is screwed into the male screw portion 21c to come into contact with the holding plate 23 to adjust the spring force of the holding spring 24.
[0036]
The rubber pulley 22 has an axial length longer than the axial length of the hollow shaft 21b because a pressing plate guided by the male screw portion 21c when compressed in the axial direction by the pressing spring 24 via the pressing plate 23. When the roller 23 comes into contact with the end face of the hollow shaft, the frictional resistance of the friction surfaces 28 and 29 on the flange portion 21a and the pressing plate 23 and the rubber pulley 22 is set to achieve the maximum value of the design specification. ing. At this time, the rubber composition, elastic modulus, viscosity, and the like of the rubber pulley 22 are also defined so as to satisfy the design specifications.
[0037]
The balance of the elastic force between the rubber pulley 22 and the pressing spring 24 in a normal state is set such that the pressing plate 23 takes an appropriate position away from the left end surface of the hollow shaft 21b to the left.
[0038]
(Cursor slip mechanism)
The slip mechanism is connected to the motor 10 by fitting and fixing the shaft 17 of the motor 10 into the hollow shaft 21b of the shaft 21.
[0039]
The motor 10 in this state is fixed to the rail 58 attached to the inner wall of the upper column 47 as shown in FIGS. 1A and 1C by the lower mounting bracket 43. The lower mounting bracket 43 has a rail 58 mounted at the center thereof and lower pulleys 51 rotatably mounted on both sides thereof as shown in FIG. The upper pulley 52 is attached to the upper end of the rail 58 as shown in FIG. The wire 30 is stretched between the rubber pulley 22 and the upper pulley 52, and the direction is changed at a right angle by the lower pulley 51.
[0040]
The slider 54 is locked to the wire 30 by a wire fixing portion 53 provided on a part thereof. The slider 54 is guided by four rollers 57 so as to sandwich the rail 58.
[0041]
The connecting portion 56 of the slider 54 is connected to the cursor ring portion 70a of the cursor 70.
[0042]
At the time of use, in order to perform initial setting, the operating device is operated to drive the motor 10 by the control device to turn the wire 30, move the slider 54, and thereby return the cursor 70 to the uppermost position. .
[0043]
Next, when it is determined that the measurement target stands on the footrest 60, the operating device is operated, and the motor 10 is rotationally driven by the control device in the opposite direction, and the wire 30 is rotated in the opposite direction. Turn to lower the cursor 70. The sensor (not shown) detects that the lower side of the cursor 70 abuts on the head, and the operation switch is opened by the detection signal of the sensor to stop the operation of the motor 10.
[0044]
When the cursor 70 moves up and down or stops, force may be applied to the cursor 70 by mistake. At this time, the driving current of the motor 10 increases in an attempt to further operate the cursor 70 against the force, and excessive load is applied to the motor 10, the cursor 70, and the components connected to the motor 10 and the cursor 70. Will be added.
[0045]
The present invention provides a slip mechanism so that an excessive load is not applied to the motor 10, the cursor 70, and components connected to the motor 10 and the cursor 70 even if the excessive load is applied. It is a thing.
[0046]
That is, when the rubber pulley 22 rotates the wire 30 by driving the motor 10 and the cursor 70 is descending or ascending, when a force opposing thereto is applied (overload state), or Despite the stop of 10, a force is applied to move the cursor 70 (overload state), and the rubber pulley 22 attempts to stop or operate according to the operation of the wire 30.
[0047]
At this time, in a steady state, the rubber pulley 22 is rotated integrally with the flange 21a due to the frictional resistance of the contact surface between the flange 21a and the pressing plate 23 due to the elastic force of the pressing spring 24. However, in the overload state, the rubber pulley 22 generates an operation state (slip) different from that of the motor 10 because the stopping force or the operation force by the wire 30 overcomes the frictional resistance. That is, overload can be prevented.
[0048]
The occurrence of the slip state prevents the drive motor and related parts from being damaged, and ensures the product life based on the specifications.
[0049]
Not only the example described above, but also a design change is possible as long as the basic function is achieved.
[0050]
(Effect of the first embodiment)
The slip mechanism of the present invention can set the torque applied to the motor by appropriately setting the elastic force of the pressing spring against the rubber pulley, and also has a structure in which the pressing plate abuts against the end face of the hollow shaft to form a limiter. , It is possible to control the maximum output of the motor.
[0051]
The cursor slip mechanism of the height meter according to the present invention is connected to the drive motor main body and the cursor even when force is applied to the cursor when the cursor is moving up and down or stopped. Components are not overloaded.
[0052]
(Other embodiments)
In the slip mechanism, the inner diameter of the center opening of the holding plate 23 is a diameter into which the hollow shaft 21b is loosely inserted, and when the axial length of the rubber pulley 22 is attached to the shaft 21, the left end of the rubber pulley 22 is closer to the left end of the hollow shaft 21b. It is also possible to form it (short) so as to be on the right side. In this case, by changing the spring force of the pressing spring 24, the friction resistance applied to the flange portion 21a, the pressing plate 23, and the rubber pulley 22 can be changed without any limit.
[0053]
【The invention's effect】
The slip mechanism of the present invention can set the output of the motor by appropriately setting the elastic force of the pressing spring against the rubber pulley, and also has a structure in which the pressing plate abuts against the end face of the hollow shaft to form a limiter. , It is possible to regulate the maximum output of the motor.
[0054]
The cursor slipping mechanism of the height meter according to the present invention makes it possible to prevent an excessive load from being applied to the components and the driving motor connected to the cursor even if a force is applied to the cursor by mistake. .
[Brief description of the drawings]
FIG. 1 is a diagram showing a cursor slip mechanism of a height meter according to the present invention.
FIG. 2 is a view showing a slip mechanism of the present invention.
[Explanation of symbols]
Reference Signs List 10 Motor 11 Motor case 13 Rubber plate 14 Mounting plate 15 Screw 16 Rubber bush 17 Motor shaft 18 Bearing 21 Shaft 21a Flange 21b Hollow shaft 21c Male thread 22 Rubber pulley 22a Groove 23 Press plate 24 Press spring 25 Washer 26 Nuts 28, 29 Friction surface 30 wire 40 lower support 42 bearing 43 lower mounting bracket 47 upper support 48 slit 49 ridge (rib)
51 Lower pulley 52 Upper pulley 53 Wire fixing part 54 Slider 55 Upper mounting bracket 56 Connecting part 57 Roller 58 Rail 59 Rail groove 60 Foot rest 70 Cursor 70a Cursor ring part 70b Cursor horizontal bar part

Claims (3)

At one end of the hollow shaft, a solid male screw portion is provided, and at the other end of the hollow shaft, a donut-shaped flange portion is provided at right angles to the hollow shaft, and has an axial length longer than the axial length of the hollow shaft. A cylindrical rubber pulley is loosely fitted to the hollow shaft so as to be rotatable with each other, a donut-shaped pressing plate is inserted into the male screw portion, and is disposed on the opposite side of the rubber pulley from the flange, and the male screw portion is pressed against the male screw portion. A slip mechanism wherein a spring is inserted into contact with the holding plate, and a nut is screwed into the male screw portion to adjust a spring force of the holding spring. A motor shaft is fitted and locked to the hollow shaft of the rubber pulley according to claim 1, a loop-shaped wire is loopably wrapped around the rubber pulley, and a cursor is locked to the wire. Cursor slip mechanism for height measurement. The cursor slip mechanism of a height meter according to claim 2, wherein a pulley other than the rubber pulley over which the loop-shaped wire is wound is pivotally supported at one end of a column in the height meter.

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