JPH02285282A - Pendulum shaft intermittent drive apparatus in metronome - Google Patents

Abstract

PURPOSE:To smoothly shake an escape pin and a pendulum shaft by gradually narrowing a pair of projections shaking the escape pin around the pendulum shaft from the base end parts thereof toward the tip parts thereof and providing predetermined inclination thereto with respect to a flange. CONSTITUTION:When a rotary shaft 33 is rotated by a wound spring, the escape wheel 35 integrally provided to the shaft 33 is also rotated in the same direction and the escape pin 37 provided to a pendulum shaft 4 is shaken toward the inside of a flange 35a by a predetermined angle by an escape pin 36 to be separated from the pin 36. Thereafter, the shaft 33 is continuously rotated and the pin 37 separated from the pin 36 is engaged with the pin 36 formed to the other flange 35a of the wheel 35. In this shaking operation of the shaft 4, the side surface becoming the contact surface with the pin 37 of the pin 36 is inclined with respect to the rotary direction of the shaft 33 because the pin 36 is formed into a tapering shape. By this method, a resultant force is generated along the axial direction of the shaft 33 from the rotation given to the pin 36 in the direction around the shaft by the inclined side surface of the pin 36 and the shaking of the pin 37 is smoothly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intermittent drive device for a pendulum shaft in a metronome, which is effective for smooth intermittent drive of a pendulum shaft.

[Prior Art] Conventionally, as an intermittent drive device for a pendulum shaft provided in a metronome, a structure shown in FIGS. 9 to 11, for example, is known.

As shown in FIG. 9, this intermittent drive mechanism 50 includes a rotating shaft 51 that is rotated in a predetermined direction by a rotational force transmitted from a drive source (the path shown in the figure), and a rotating shaft 51 that is spaced apart in the length direction of the rotating shaft 51. A pair of flanges 5 provided integrally with the
2, and from each of these flanges 52, the other flange 5
at least a pair of cylindrical protrusions 5 protruding toward 2;
3, a pendulum shaft 54 to which a pendulum (path shown) is attached,
The pendulum shaft 54 is provided with an escape pin 55 that protrudes along the radial direction.

The flange 52 and the protrusion 53 are formed by cutting metal, and both have the protrusion 5 on the flange 52.
3 is integrated by press-fitting.

In this intermittent drive mechanism 50, the rotating shaft 51 is
As shown by the arrow (A) in FIG. 1O and FIG. 55, further rotation of the rotating shaft 51 and start of swinging of the pendulum shaft 54 in the opposite direction, the escapement pin 55
is pressed and moved by the projection 53 toward the other flange 52, as shown by the arrow (b) in the figure. As a result, the pendulum shaft 54 begins to swing in the opposite direction.

The projection 53 provided on the other flange 52 is similarly engaged by the rotation of the rotating shaft 51 with the escape pin 55 that has been swung toward the other flange 52 in this manner.

On the other hand, since rotational force is continuously applied to the flange 52, the escape pin 55 is pushed back toward the one flange 52 by the protrusion 53 provided on the other flange 52, and returns make it swing in the direction.

Further, the pendulum shaft 54 is excited by the impact force generated when the escape pin 55 and the protrusion 53 are engaged, thereby generating a beat sound.

By repeating the above operations, the pendulum shaft 54 and the pendulum attached to the pendulum shaft 54 are swung within a predetermined angle range, and intermittent beat sounds are continuously generated. .

[Problems to be Solved by the Invention] By the way, the following problems remain in the conventional metronome pendulum shaft intermittent drive device 50 described above.

That is, the swinging operation of the pendulum shaft 54 is performed by the escape pin 55.
is obtained by being alternately pressed by the protrusions 53. In the above configuration, the protrusions 53 generate an excitation driving force only at the pointed portion at the tip, but the parallel pin portions do not produce any excitation action. Moreover, there is a problem in that a resistance force (frictional force) is generated against rocking.

In addition, while the swing locus of the escapement pin 55 is arc-shaped, the locus of movement of the contact point between the two is in the length direction of the protrusion 53, and both trajectories are thick (unlikely, There was a problem with the power transmission efficiency being low.

Furthermore, due to the above-described problem, there is also a problem that the swinging motion of the escape pin 55 by the protrusion 53, that is, the swinging motion of the pendulum, lacks smoothness.

Therefore, in the past, it has been desired to deal with these problems, and the present invention aims to solve the remaining problems in the conventional technology.

[Means for Solving the Problems] The present invention aims to provide a pendulum shaft intermittent drive device for a metronome that can effectively solve the conventional problems described above. In a pendulum shaft intermittent drive device that swings a pendulum attached to the pendulum shaft by reciprocating an escapement pin protruding from the pendulum shaft along the radial direction around the pendulum shaft, the pendulum shaft and a rotating shaft that is disposed substantially perpendicular to each other and is rotated in a predetermined direction by a rotational force transmitted from a drive source; and a pair of rotating shafts that are integrally provided with the rotating shaft and positioned on both sides of the escapement pin. and a flange protruding from each of these flanges toward the escapement pin, which is engaged with and disengaged from the escapement pin as the rotating shaft rotates, and the escapement pin is oscillated around the pendulum shaft. a pair of protrusions that are movable; each protrusion has a width that gradually becomes narrower from its base end to its distal end, and has a predetermined inclination angle with respect to the flange; shall be.

[Operation] The pendulum shaft intermittent drive device in the metronome of the present invention is
By rotating the rotating shaft in a predetermined direction by a drive source, the escapement pin is alternately suppressed and moved by projections protruding toward the escapement pin from a pair of flanges on both sides of the escapement pin. , thereby ensuring intermittent rocking of the pendulum shaft to which the escapement pin is attached.

The width of each of the protrusions is gradually narrowed from the base end to the distal end thereof, and the width of each projection is made to have a predetermined inclination angle with respect to the flange. A component force in the axial direction is generated from the rotational force, which improves the transmission efficiency of the force applied from the protrusion to the escapement pin, and provides smooth rocking of the pendulum shaft.

[Example 1] An example of the present invention will be described below with reference to FIGS. 1 to 8.

1 and 2 show an overall diagram of a metronome 1 to which this embodiment is applied.

This metronome 1 rotatably supports a casing 2, a pendulum 3 swingably attached to the casing 2, and a pendulum shaft 4 to which the pendulum 3 is attached.
This pendulum shaft 4 is intermittently oscillated, and this pendulum shaft 4 is
The casing 2 is formed of synthetic resin, and the casing 2 has a resonator partitioned by a partition wall 6. The basic structure includes a box 7 and an end of the pendulum shaft 4 in contact with the partition wall 6.

Next, to explain these details, the casing 2 has a rectangular columnar base 2a formed below (lower in the figure), and a base 2a connected above the base 2a (upper in the figure). It is formed by injection molding or the like.

Further, the base portion 2a and the display portion 2b are formed in a hollow shape, and an opening 8 is formed at the lower end of the base portion 2a, and is closed by a bottom plate 9 detachably attached.

Furthermore, as shown in FIGS. 1 and 2, the display section 2b has a substantially triangular display surface IO formed by cutting out a part of the peripheral wall of a cone. A scale (illustrated path) is written to indicate the speed of the car.

Then, a stepped portion 11 is formed at the upper part of the base portion 2a by the amount that the surface of the cone recedes due to the formation of the display surface IO,
A through hole 12 is formed near the display surface IO of this stepped portion 11, and the pendulum 3 is disposed so as to pass through the through hole 12, which vertically communicates the inside and outside of the base portion 2a. It looks like this.

The partition wall 6 is formed integrally with the base 2a from the inner middle part of the step 11 toward the bottom of the base 2a. It is divided into 14 sections.

These two chambers 13 and 14 are communicated with each other at the lower end of the partition wall 6, and the chamber 13 located below the step 11 forms the partition wall 6 and the step 11. The resonance box 7 is surrounded by a part of the upper wall and a part of the peripheral wall of the base 2a, and the intermittent drive device 5 including the sounding mechanism is provided in the other chamber 14.

As shown in FIG. 2, the intermittent drive device 5 includes a plurality of protrusions 15 integrally formed inside and below the display section 2b.
In the attached state, the pendulum shaft 4 is held in a horizontal state, and the pendulum 3 attached to the pendulum shaft 4 is placed approximately at the center of the through hole 12. It is designed to be positioned.

Further, details of the intermittent drive device 5, which is the main part of the present invention, will be explained with reference to FIGS. 3 to 8.

This intermittent drive device 5 has screws 1 attached to the plurality of protrusions 15.
6, a side plate 18 formed by bending one side of the base plate 17, and a side plate 18 that is arranged parallel to the side plate 18 and fixed to the base plate 17 with screws 19. The base body A includes a bracket 20 and a bearing plate 21 formed by bending the base plate 17 at a position orthogonal to the side plate 18 and the bracket 2o.

The bearing of the base plate 17 is formed with a window 22 parallel to the plate 21 near the plate 21, and the pendulum 3 is disposed so as to pass through this window 22. A bracket 23 is integrally formed between the bearing and the bracket 20, and the bracket 23 is substantially parallel to the blow plate 21 (see FIG. 6). 4 is rotatably supported.

The bearing has a plate 21 through which one end of the pendulum shaft 4 is rotatably inserted, and a plate-shaped stopper 24 that abuts one end of the pendulum shaft 4 to position it in the length direction. is fixed with screws 25, and this stopper 24 is adapted to come into contact with the partition wall 6 when the base plate 17 is attached to the caning 2.

Note that the stopper 24 can also be compressed and fixed to the bearing plate 21 by an integral fastener structure that takes advantage of its spring properties.

Therefore, the pendulum shaft 4 is brought into contact with the partition wall 6 via the stopper 24 (see FIG. 2).

On the other hand, a mainspring 26 is mounted between the side plate 18 and the bracket 20, and the end of the mainspring 26 on the winding center side is rotatably supported by the side plate 18 and the bracket 20. is fixed to
Further, an end portion on the outer peripheral side is engaged with a hook 28 formed integrally with the base plate 17.

As shown in FIGS. 3 and 5, a large diameter drive gear 29 is attached to the mainspring shaft 27.
This drive gear 29 includes a small-diameter driven gear 31 provided at one end of an idle shaft 30 rotatably supported by the side plate 18 and the bracket 20.
are engaged.

Further, a large diameter drive gear 32 is integrally provided at the other end of the idle shaft 30, and this drive gear 3
2 is meshed with a synthetic resin driven gear 34 that is integrally provided with a metal rotating shaft 33 that is rotatably supported by the side plate 18 and the bracket 20.

An escape wheel 35 is integrally provided on this rotating shaft 33 so as to sandwich the pendulum shaft 4 therebetween.As shown in FIG.
A pair of flanges 35a are provided at a predetermined interval in the length direction, and each of these flanges 35a has a rotating shaft 33.
escape pins 36 as protrusions that alternately protrude in opposite directions at intervals of 90 degrees in the circumferential direction; an inner shaft 35b made of synthetic resin disposed between the flanges 35a; and the rotating shaft 33. An outer shaft 35c made of synthetic resin is disposed at the end opposite to the side where the driven gear 34 is provided.

The escape pin 36 is connected to the flange 35.
a is formed of a metal plate, and this fledge 3
By press-molding 5a, it is formed integrally with the flange 35a.

Further, as shown in FIGS. 6 and 7, these escape pins 36 are attached to the flange 35 so that their tips approach the rotating shaft 33 (toward the inner shaft 35b).
The flange 35 is inclined at a predetermined angle (θ) with respect to a, and as shown in FIGS.
It has a tapered shape that gradually becomes narrower from the proximal end on the side a to the distal end on the protruding side, and the distal end has an arc shape.

On the other hand, both flanges 35a are connected to the driven gear 34.
, the inner shaft 35b1, and the outer shaft 35c are integrated by outsert molding, and the rotating shaft 33 is integrated with the inner shaft 35b.

It is integrated with the outer shaft 35C1 and the driven gear 34 by insert molding.

And between the pair of escape wheels 35,
Escape pins 37 protruding substantially radially from the pendulum shaft 4 are positioned so that each escape pin 3
6 (see Fig. 6).

This escape pin 37 is engaged with one of the escape pins 36 provided on one flange 35a as the rotating shaft 33 rotates, and this escape pin 37 is engaged with one of the escape pins 36 provided on one flange 35a.
6 to disengage the engagement;
After the engagement with this escape pin 36 is released,
It is immediately engaged with the escape pin 36 provided on the other flange 35a.

By continuously repeating such operations, the pendulum shaft 4 is reciprocated within a predetermined angle range.

Vibrations are applied to the pendulum shaft 4 due to the impact force when the escape pin 36 is engaged with the escape pin 37.

On the other hand, in FIGS. 1 to 5, the reference numeral 38 indicates a weight integrally attached to one end of the pendulum 3 (the end located within the base 2a), and the reference numeral 39
is a balancer that is slidably attached to the part of the pendulum 3 that protrudes outward from the casing 2, and by adjusting the locking position with respect to the pendulum 3, the period of swing of the pendulum 3, that is, the beat. The speed can be adjusted.

Further, in FIG. 1, reference numeral 40 indicates a lid, which has a substantially conical shape between the display section 2b of the casing 2 and the display section 2b. It is rotatably attached to the casing 2 by being fitted into the locking hole 42 formed at the upper end, and the display surface 1 of the display section 2b is rotated relative to the casing 2.
It is designed to open and close 0.

Next, the operation of the metronome 1 of this embodiment configured in this way will be explained.
6 rotates the mainspring shaft 27 in the direction shown by the arrow (A) in FIG.
0 and the rotating shaft 33 are connected to each gear 29, 31, 32, 34.
(These rotational directions are shown by arrows (b) and (c) in FIG. 2).

When the rotating shaft 33 is rotated in this way, the escape wheel 3 that is integrally provided on the rotating shaft 33
5 is also rotated in the same direction, and the escape pin ``A6'' formed on one flange 35a of the escape wheel 35 causes the escape pin 37 provided on the pendulum shaft 4 to be rotated toward the inside of both flanges 35a. It is swung by a predetermined angle and separated from the escape pin 36.

After this, since the rotating shaft 33 continues to rotate, the escape pin 37, which is separated from the escape pin 36 formed on one flange 35a of the escape wheel 35, It is engaged with an escape pin 36 formed on the other flange 35a of the wheel 35.

When the pendulum shaft 4 is oscillated by the intermittent drive device 5, since the escape pin 36 has a tapered shape, the escape pin 37 of the escape pin 36
As shown in FIG. 8, the side surface 36a that becomes the contact surface with the
It is inclined with respect to the rotation direction of the rotation shaft 33.

As a result, the escape pin 36 is
A force component along the axial direction of the rotating shaft 33 is generated by the inclined side surface 36a, which allows the escape pin 37 to swing smoothly and the pendulum shaft 4 to swing smoothly. can get.

Furthermore, since the side surface 38a of the escape pin 36 is inclined, when the escape pin 37 engages with the escape pin 36 and rides on the side surface 36a, a force that suppresses the swinging of the pendulum shaft 4 is generated. acts, and when the escape pin 37 slides down the side surface 36a (±, pendulum shaft 4
A force that promotes the rocking of mainspring 2 is applied.
Even if there is a change in the drive torque generated by 6, the change in the swing angle of the escape pin 37 is reduced, and stability during the swing period can be achieved.

On the other hand, in this embodiment, the escape pin 36 is inclined at a predetermined angle θ so that its tip approaches the rotating shaft 33.
As shown in (g), the swing locus of the escape pin 37 and the movement locus of the contact point between the escape pin 37 and the escape pin 36 are made to almost match, and as a result, the movement from the escape pin 36 to the escape pin 37 Changes in the magnitude of the applied force are reduced, the excitation force is stabilized, and from this point of view as well, smooth swinging of the pendulum shaft 4 can be obtained.

Further, by causing the escape pin 37 to collide with the escape pin 36 as described above, vibration in the longitudinal direction of the pendulum shaft 4 is imparted to the escape pin 37, and this vibration is formed in the base 2a of the casing 2. It is transmitted to the partition wall 6 via the stopper 24.

Since this operation is continuously performed by the rotation of the rotating shaft 33, the escape pin 37 is reciprocated within a predetermined angle range, and the pendulum attached to the pendulum shaft 4 is accordingly Similarly, as shown by the arrow (D) in FIG. 1, the drum 3 is reciprocated within a predetermined angle range, and the beat amount is intermittently generated.

In this way, when the vibration is transmitted to the partition wall 6, it resonates in the resonance box 7 via the partition wall 8, and a large amount of beat is generated.

On the other hand, the sound quality, etc. of the pre-beat consonant is greatly affected by the thickness of the partition wall 6, so by appropriately setting the thickness of the partition wall 6, the desired number of beats can be obtained, or the sound quality adjustments will be made.

It should be noted that the shapes and dimensions of each component shown in the above embodiments are merely examples, and can be changed in various ways based on design requirements and the like.

For example, the escape wheel 35 can be formed by sintering, using a material such as a sintered alloy, to have a shape substantially similar to that of the embodiment described above.

In this case, the escape wheel 35 itself has lubricity, and it is possible to obtain the same effect as when using oil-impregnated meckle or the like.

Therefore, the durability and reliability of the escape wheel 35 can be improved.

[Effects of the Invention] As described above, the pendulum shaft intermittent drive device for a metronome according to the present invention provides the following excellent effects.

By making the protrusion tapered, the contact surface between the protrusion and the escapement pin is inclined with respect to the rotational direction of the rotating shaft, thereby reducing the component force along the axial direction from the rotational force applied to the protrusion around the axis. This allows the escape pin and pendulum shaft to swing smoothly.

In addition, by slanting the contact surface of the protrusion with the escapement pin, when the escape pin engages with the protrusion and rides on the contact surface, a force is generated that suppresses the swinging of the pendulum shaft, and When the escapement pin slides down the contact surface, a force is generated that promotes the swinging of the pendulum shaft, and this also allows the escapement pin and the pendulum shaft to swing smoothly and reliably.

Furthermore, by tilting the protrusion tip closer to the rotation axis, even smoother rocking can be ensured.

[Brief explanation of drawings]

In the drawings, FIGS. 1 to 8 show one embodiment of the present invention, and FIG. 2 is a vertical cross-sectional side view of the same, FIG. 3 is a front view of one embodiment, FIG. 4 is a side view of one embodiment, FIG. 5 is a bottom view of one embodiment, and FIG. 6 is a bottom view of one embodiment. FIG. 7 is an enlarged front view of the main part, FIG. 8 is a sectional view along the line ■-■ in FIG. 7, and FIGS. 9 to 11 are FIG. 9 is an external perspective view of the main part, FIG. 1O is a bottom view showing the relationship between the protrusion and the escape pin, and FIG. 11 is a front view of the pendulum shaft intermittent drive device. 1... metronome, 3... pendulum, 5... intermittent drive device, 35... escape wheel, 35b... inner shaft, 35c... Outer shaft, 3F...Escape pin (protrusion), 2...
Casing, 4... Pendulum shaft, 33... Rotating shaft, 35a... Flange, 37... Escape pin.

Claims (1)

[Claims] By reciprocating an escapement pin protruding from the pendulum shaft of the metronome along the radial direction around the pendulum shaft,
In the pendulum shaft intermittent drive device for swinging a pendulum attached to the pendulum shaft, a rotating shaft is arranged substantially orthogonal to the pendulum shaft and rotated in a predetermined direction by a rotational force transmitted from a drive source. and a pair of flanges that are integrally provided on the rotating shaft and located on both sides of the escapement pin, and a pair of flanges that protrude from each of these flanges toward the escapement pin and that are adapted to the rotation of the rotating shaft. and at least a pair of protrusions that are engaged with and disengaged from the escapement pin to swing the escapement pin around the pendulum axis, each of the protrusions having a width that gradually increases from the base end to the distal end thereof. made narrow,
An intermittent drive device for a pendulum shaft in a metronome, characterized in that the pendulum shaft has a predetermined inclination angle with respect to the flange.