JP2001091431A - Automatic floor impact noise generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device dropping a rubber sphere body with a mass of about 2.5 kg as a shock source defined by JIS A 1418-2 newly published according to revision of regulations for a floor shock noise level measurement method in a field for a building (JIS A 1418). SOLUTION: In a setting base 1a for a frame 1, a rotational wheel 2 provided with a guide roller 3 having a shaft 3a in the position separated from a rotary shaft 2a by a distance T is arranged, and a lever 4 with a length L driven by a motor 5 and provided with a rotary shaft 4a in the position separated from the rotary shaft 2a by a distance S is arranged. In a groove 2b formed in the outer circumference of the wheel 2, a cord member 6 is wound around, and a shock source 7 is installed to the end of the cord member 6. While the lever 4 is continuously turned in the arrow (a) direction, the wheel 2 is rotated in the same direction via the guide roller 3 so as to lift the shock source 7, and when the contact with the guide roller 3 is released, the wheel 2 is turned reversely by the torque complying with the mass of the shock source 7 so as to drop the shock source 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic floor impact sound generator capable of simulating an impact sound generated when a child jumps on a floor or jumps off a chair, for example.

[0002]

2. Description of the Related Art When evaluating the impact sound insulation performance of a floor structure of a building, a performance index is determined based on the provisions of JIS A 1418 "Method of measuring floor impact sound level at building site". By the way, the above-mentioned standards are two standards in 1999 (JI
SA 1418-1: Standard lightweight impact source method, JIS A 1418-
2: Standard weight impact source method). Of these, JIS A 1418-1 is
It is compiled to conform to ISO 140-7. Also JI
Although SA 1418-2 has been compiled according to the conventional standards, a spherical rubber shock source with a mass of about 2.5 kg will be introduced as a standard shock source in addition to the conventional shock source .

A conventional shock source is a bang machine shown in FIG.
It is possible to configure the shock source with a device called 51. The bang machine 51 has a striking member 52 equivalent to a minicar tire 5.20-10-4PR adjusted to an air pressure of 15 MPa.
The striking member 52 has a height of 0.
It is configured to rise freely from 8m to 1.0m and fall freely.

However, with the newly added rubber shock source, there is no device for mechanically dropping the rubber shock source.
It is based on "hand drop impact". When performing this drop impact, there is a problem in the stability of the impact force. That is, the operation of picking up and dropping the rubber impact source in one measurement is usually required about 100 times. Therefore, a person for dropping the rubber impact source is required, and the labor is increased. Therefore, it is preferable to drop the rubber impact source mechanically.

When a bang machine 51 is used for mechanically dropping a rubber shock source, a lever 53 is used.
Since the rubber shock source is dropped with the rotation of the rubber shock source, the rubber shock source draws an arc-shaped trajectory, and there is a problem that free fall cannot be realized. It is necessary to increase the length of 53, which is not practical. Further, since the mass of the rubber impact source 52 is relatively small, the weight of the lever 53 cannot be neglected, and there is a problem that it is difficult to reproduce the “impact force waveform”.

An automatic impact device shown in FIG. 6 has been proposed to solve the problem of the drop impact and the problem of the bang machine 51. In this device, the impact source 61 is supported by a support rod 63 via a plurality of wires 62, and the support rod 63 is sandwiched by a pair of guide rollers (not shown).
One guide roller is driven by a drive motor 64 and a clutch 65, and the other guide roller is driven by a magnet 66.
The support rod 63 is pressed against the support rod 63 to
When the support bar 63 reaches a preset height, a micro switch (not shown) is activated to operate the clutch 65.
The magnet 66 is opened and the support rod 63 (the impact source 61) falls freely. When the impact source 61 collides with the floor surface 67 and repels, the repulsion is detected by the photoelectric switch 68, and a signal generated at this time activates the clutch 65 and the magnet 66 to raise the support rod 63, thereby causing an impact. The source 61 is raised, and thereafter, the impact source 61 is continuously
Is configured to fall and rise.

In the above apparatus, the support rod 63 is lifted by detecting repulsion after the impact source 61 collides with the floor surface 67.
The impact source 61 that has collided with the 67 does not continuously collide with the floor surface 67 in an unmanaged state, and an impulsive sound can be generated in a good state.

[0008]

In the automatic impact device constructed as described above, the mechanism for raising the support rod 63 is such that a pair of guide rollers are arranged on the outer periphery of the support rod 63, and one of the guide rollers is driven by a motor. 64, and driven by a clutch 65, and the other guide roller is urged by a magnet 66 to be firmly held. Thus, there is a problem that the structure is complicated and adjustment and maintenance are not easy.

Further, when the support rod 63 is dropped, friction occurs with the guide roller, and there is a problem that free fall cannot be realized. In order to solve this problem, it is necessary to increase the length of the support rod 63 in order to increase the lifting height, and the support rod 63 may collide with a ceiling or lighting equipment during operation. However, there arises a problem that carrying is inconvenient.

[0010] A wire between the support rod 63 and the impact source 61
Because the length of 62 is short, when the impact source 61 is dropped,
There is a possibility that the support rod 63 will collide with the support rod 63. In order to solve this problem, it is necessary to lengthen the support rod 63, and the same problem as described above occurs.

In addition, since the support rod 63 comes into contact with the guide roller and rises, and it is difficult to make the contact rod completely non-contact even when it falls, there is also a problem that abrasion increases and the cost for repair increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic floor impact sound generating apparatus which has a simple structure, does not increase the size of the apparatus itself, and can generate a reliable and stable impact sound.

[0013]

According to the present invention, there is provided an automatic floor impact sound generating apparatus according to the present invention, comprising: an impact source which collides with a floor to generate an impact sound; and a string connected to the impact source. And a wheel configured to be rotatable and around which the string-shaped member is wound (one end of the string-shaped member is fixed), and a wheel disposed at a predetermined distance from a rotation center of the wheel and rotated by the wheel. A guide roller having an axis parallel to the axis, a center of rotation at a position separated from the center of rotation of the wheel by a predetermined distance, and a distance from the center of rotation to one end of the wheel is determined by the rotation of the wheel. A lever formed to have a size corresponding to a size obtained by adding the distance from the center to the rotation center and the distance from the rotation center of the wheel to the guide roller, and a lever that engages with the guide roller to rotate the wheel; It is those composed and a motor for driving the serial lever.

In the above automatic floor impact sound generating apparatus, when the lever is driven to rotate about the center of rotation of the lever, the lever comes into contact with the guide roller fixed to the wheel in the course of the rotation. When the lever is further rotated, the wheel rotates around the center of rotation with this rotation, and with this rotation, the string-like member is wound around the wheel and the shock source rises.

The center of rotation of the wheel and the center of rotation of the lever are separated by a predetermined distance (S), and the center of rotation of the wheel and the axis of the guide roller are separated by a predetermined distance (T). The guide roller moves in the longitudinal direction of the lever with the rotation of the lever, and the wheel rotates to wind up the string-shaped member. When the lever is further rotated and the contact of the guide roller with the lever is released (disengaged), the wheel is configured to rotate freely, so that the wheel is connected to the string-shaped member wound around the wheel. Due to the torque based on the impact source, the wheels are rapidly reversed and the impact source falls, which can impact the floor.

In the above automatic floor impact sound generator, the distance (L) from the center of rotation of the lever to the end on the side contacting the guide roller is set in accordance with the distances S and T. Thus, the contact range of the guide roller with the rotation of the lever can be set, and the rotation angle of the wheel can be set accordingly.

That is, when the radius of the guide roller is r, the distance L from the center of rotation of the lever to the end is S + T-
By setting it equal to or smaller than the dimension of r, the range in which the wheel rotates after the lever comes into contact with the guide roller, the position where the contact between the lever and the guide roller is released and the wheel starts free rotation, etc. Can be set.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the above-mentioned automatic floor impact sound generator will be described below with reference to the drawings. FIG.
FIG. 2 is a front view illustrating the configuration of an automatic floor impact sound generator. FIG. 2 is a side view illustrating the configuration of the automatic floor impact sound generator. FIG. 3 is a diagram illustrating a process of raising the impact source. FIG. 4 is a view for explaining the process of raising the dropped impact source again.

Automatic floor impact sound generator A according to the present embodiment
Realizes that when an impact is applied to the floor by the impact source, the impact source is mechanically raised, reaches a predetermined height, and then automatically falls from the height, The impact source which has fallen and rebounded from the floor is prevented from dropping again from the repulsion height and giving an impact to the floor, and the falling period is constant so that continuous falling can be realized. .

The automatic floor impact sound generator A includes a frame 1 having a mounting base 1a and a support 1b, a wheel 2 disposed on the mounting base 1a of the frame 1, a guide roller 3 mounted on the wheel 2, A lever 4 rotating in contact with the guide roller 3, a motor 5 for driving the lever 4, a string member 6 wound around the wheel 2, and the string member 6
And an impact source 7 attached to the main body.

By continuously driving the motor 5, the lever 4 is continuously rotated. In this rotating process, the lever 4 is brought into contact with the guide roller 3 to rotate the wheel 2, thereby raising the impact source 7 and guiding the impact source 7. The impact source 7 is dropped by releasing the contact with the roller 3 to rotate the wheel 2 in the reverse direction, and further, the rotation of the lever 4 makes contact with the guide roller 3 again to rotate the wheel 2. I have.

Therefore, while the motor 5 is being driven, the impact source 7 can be repeatedly dropped at a predetermined time interval (at a constant cycle) to generate an impact on the floor.

The frame 1 is provided with a mount 1a at a height that satisfies a predetermined drop height (H) of the impact source 7 from the floor 8 and the mount 1a is attached to a plurality of columns. 1b. An impact source guide 1c is provided at a position below the mounting base 1a and facing the outer periphery of the wheel 2.
It is configured to be able to guide the rise and fall of the impact source 7 due to the rotation of.

The wheel 2 has a rotating shaft 2a serving as a center of rotation protruding from one side (the right side in FIG. 2), the rotating shaft 2a is supported by a bearing 9, and arrows a and b shown in FIG. It is configured to be able to rotate freely in any of the directions. In particular, when the wheel 2 rotates in the direction of arrow b (rotation when the impact source 7 falls), it is preferable that the wheel 2 has as little resistance as possible. Therefore, it is preferable to use a bearing 9 having a small frictional resistance. In the wheel 2 configured as described above, it is possible to easily rotate the wheel 2 by applying an extremely small force, and it is possible to substantially satisfy free fall.

The wheel 2 has a groove 2 formed on the outer periphery.
It has a function of winding the string-shaped member 6 around b to raise the impact source 7 to the drop height H. It does not matter how many times the string member 6 is wound around the wheel 2 when the impact source 7 is raised to the drop height H. But wheel 2
When the number of windings of the string-shaped member 6 with respect to the string-shaped member 6 increases, the string-shaped members 6 may be entangled or contacted with each other, and it may not be possible to realize a stable drop of the impact source 7.

For this reason, it is preferable that the diameter of the groove 2b of the wheel 2 is such that the drop height H can be satisfied by winding the string member 6 one turn (360 degrees) or less. With this configuration of the wheel, when the string-shaped member is wound around the groove 2b of the wheel 2, the groove 2b
By wrapping only one string-shaped member 6 around the same, it is possible to prevent entanglement and to prevent friction between the string-shaped members 6.

In this embodiment, the maximum drop height H of the impact source 7 is
Is set to 1 m, and the diameter of the groove 2b of the wheel 2 is set to 400 mm. Therefore, in order to raise the impact source 7 by 1 m,
The winding angle of the string-shaped member 6 with respect to the wheel 2 is about 287 degrees, and the wheel 2 is rotated in the direction of arrow a within the range of this angle, and the wheel 2 rotated by this angle is reversed in the direction of arrow b, thereby causing an impact source. 7 can be dropped from a height of 1 m toward the floor surface 8. In this case, it is necessary that the string-shaped member 6 be fixed to the wheel 2 at a position where the free end is wound around the groove 2b of the wheel 2 at an angle larger than the winding angle.

The wheel 2 is rotated in the direction of arrow a by the driving force transmitted by the contact of the guide roller 3 with the lever 4, but the contact of the guide roller 3 with the lever 4 is released in the direction of arrow b. It is rotated by the torque generated by the impact source 7 caused by the above. Therefore, it is possible to increase the torque by increasing the diameter of the wheel 2, and to reduce the resistance when the impact source 7 is dropped by reducing the friction of the bearing 9, thereby making it possible to approach the free fall. Becomes

In the groove 2b formed in the wheel 2, a stand is provided on the feeding side of the string-shaped member 6 so as to face the groove 2b.
A string guide 10 consisting of a roller 10b and a roller 10b is arranged, and the string member 6 is passed through a cylindrical space defined by the groove 2b and the string guide 10 so that the wheel 2
It is possible to guide the string-shaped member 6 so as not to be detached from the groove 2b when winding and unwinding the string-shaped member 6 with the rotation of.

A measuring member 11 for measuring the number of times the impact source 7 has been dropped is disposed near the bearing 9 supporting the rotating shaft 2a of the wheel 2. It is configured so that the number of drops can be detected.
The configuration of the measuring member 11 is not particularly limited. For example, a detection cam is fixed to the rotating shaft 2a, and the rotation of the detection cam is measured by a contact-type sensor or a non-contact-type sensor. It is possible to measure the number of falls.

The guide roller 3 contacts the lever 4 and rotates the wheel 2 by the driving force of the lever 4. The guide roller 3 rotates on the other side (left side in FIG. 2) of the wheel 2 and rotates the wheel 2. It has a shaft 3a which is arranged at a predetermined distance T from the center rotating shaft 2a and is parallel to the rotating shaft 2a, and a roller 3b attached to the shaft 3a.

The shaft 3a constituting the guide roller 3 is arranged at a position separated from the rotating shaft 2a of the wheel 2 by a distance T and attached to the side surface of the wheel 2. However, when the shaft 3a is mounted on the wheel 2, it is preferable that the mounting position can be changed.
It is possible to change the separation distance T from a, and it is possible to improve the degree of freedom when setting the drop height H of the impact source 7.

The structure for changing the mounting position of the shaft 3a with respect to the wheel 2 is not particularly limited. For example, an elongated hole is formed in the radial direction of the wheel 2, and the shaft 3a is fitted into the elongated hole. It is possible to adopt a structure that can be moved. In this case, it is possible to set a mounting position by forming a screw at the end of the shaft 3a and projecting it from the long hole and fastening a nut to the screw.

The roller 3b constituting the guide roller 3 is
It moves in the longitudinal direction of the lever 4 while being in contact with the lever 4 and being transmitted with the driving force. For this reason, it is preferable that the roller 3b is a rotating body that rotates about the shaft 3a. In this embodiment, a needle bearing having a radius r is used as the roller 3a.

The lever 4 is arranged on the surface in the same direction as the guide roller 3 provided on the wheel 2, and is rotated by being driven by a motor 5, and is rotated within a predetermined rotation range in this rotation process. 3 and transmits a rotational force to the guide roller 3 so that the guide roller 3
It rotates without contacting with.

A rotation shaft 4a serving as a rotation center of the lever 4 is arranged at a position separated from the rotation shaft 2a of the wheel 2 by a predetermined distance S. The direction in which the rotating shaft 4a of the lever 4 is separated from the rotating shaft 2a of the wheel 2 is not particularly limited. In this embodiment, the rotation shaft 4 a of the lever 4 is separated upward from the rotation shaft 2 a of the wheel 2.

The guide roller 3 is moved from the rotation shaft 4a of the lever 4
L (for convenience, referred to as “length L of lever 4”) is the distance T between the shaft 3 a of the guide roller 3 and the rotation shaft 2 a of the wheel 2, and the length T of the lever 4. It is set in accordance with the distance S between the rotation shaft 4a and the rotation shaft 2a of the wheel 2, and the radius r of the guide roller 3.

That is, the linear distance from the rotating shaft 4a of the lever 4 to the shaft 3a of the guide roller 3 is S + T at the maximum and TS at the minimum, and varies within the above range. Therefore, by setting the length L of the lever 4 to a value within the above range, the contact start position and the contact release position of the lever 4 with respect to the guide roller 3 can be appropriately set. For this reason, it is possible to set the compulsory rotation angle of the wheel 2 by the lever 4.

When the length L of the lever 4 is changed, for example, a plurality of levers 4 having different lengths L are prepared, and these levers 4 can be selected and attached to the rotating shaft 4a. It is also possible to form a long hole in the lever 4 and change the length L of the lever 4 using this long hole.

The motor 5 drives the lever 4 to drive the arrow c
It rotates continuously in the direction. This motor 5
Is connected to the rotation shaft 4a of the lever 4 via a transmission device 12 including a reduction gear, a transmission, an orthogonal shaft conversion device, and the like, so that the lever 4 can be set to a desired rotation speed. .

When performing control such as turning on / off the motor 5 and adjusting the speed, the frame 1 is provided with a switch and a control unit (not shown), and the motor 5 and the transmission device 12 are directly controlled by the switch and the control unit, or It is configured to be controllable. In particular, in the case of remote control, wireless control is preferable, whereby a technician below the floor to be evaluated (downstairs) can independently measure the generation of the impact sound.

The string-shaped member 6 has one end connected to the shock source 7 and the other end fixed to the wheel 2 to connect the shock source 7 to the wheel 2. The string-shaped member 6 must not apply a special force to the shock source 7 when the shock source 7 falls and gives a shock to the floor 8. That is, the string-shaped member 7 needs to have extremely high flexibility, and does not need to have rigidity. Therefore, a string, tape, wire, or the like can be used as the string-shaped member 6.

The shock source 7 is a standard shock source defined in JIS A 1418-2, and is configured to realize the impact force (N) and the shock time (ms) specified in this standard. In this embodiment, a rubber sphere of about 2.5 kg is used.

In the above configuration, a rotational force in the direction of arrow a is applied to the wheel 2 by the contact between the lever 4 and the guide roller 3 as the lever 4 rotates in the direction of arrow c. When the contact between the lever 4 and the guide roller 3 is released after the wheel 2 rotates in the direction of arrow a, the wheel 2
, A torque corresponding to the radius of the wheel 2 and the weight of the impact source 7 acts to rotate in the direction of the arrow b. And shock source 7
When the wheel 2 collides with the floor surface 8, the wheel 2 continues to rotate in the direction of the arrow b due to inertia, the positional relationship between the guide roller 3 and the lever 4 is changed, or the string of the wheel 2 with respect to the groove 2 b There is a possibility that problems such as the winding of the member 6 being reversed may occur.

Therefore, the automatic floor impact sound generator A includes:
A stopper 13 for stopping the rotation of the wheel 2 in the direction of arrow b is provided. The stopper 13 includes a contact 13a provided at a predetermined position on the side surface of the wheel, and a locking member 13b provided at a predetermined position on the mounting base 1a of the frame 1. The stopper 13b rotates with the rotation of the wheel 2 in the direction of arrow b. Contact
When the wheel 13a collides with the locking member 13b, the rotation of the wheel 2 is stopped.

Next, a procedure for generating an impact sound by dropping the impact source 7 on the floor surface 8 by the automatic floor impact sound generator A having the above-described configuration will be described with reference to FIGS. In the figure, the distance T between the rotation shaft 2a of the wheel 2 and the shaft 3a of the guide roller 3, the distance S between the rotation center 2a and the rotation shaft 4a of the lever 4, and the length L of the lever 4 are JIS A1418.
The height of the impact source 7 is set so as to be able to generate the impact force (N) and the impact time (ms) specified in -2.

FIG. 3A shows an initial state, in which the impact source 7 is on the floor surface 8 and the wheel 2 collides with the stopper 13b constituting the stopper 13 when the contactor 13a collides with the locking member 13b. I have. The lever 4 is in a state before it comes into contact with the guide roller 3. When the impact source 7 collides with the floor 8 to generate an impact sound, the motor 5 is driven from the above state to rotate the lever 4 in the direction of arrow c.

When the lever 4 rotates in the direction of arrow c, the lever 4 comes into contact with the guide roller 3 to apply a turning force as shown in FIG.
Rotate in the direction. With the further rotation of the lever 4,
The wheel 2 continues to rotate in the direction of arrow a, and FIG.
The shock source 7 is raised as shown in FIG. At this time, the guide roller 3 moves in the longitudinal direction of the lever 4 along the contact surface of the lever 4.

The guide roller 3 first contacts the end 4b of the lever 4 along the lever 4, then moves in the direction approaching the rotation shaft 4a of the lever 4, and thereafter, as shown in FIG. As described above, it moves in a direction approaching from the rotation shaft 4a to the end 4b. During this movement process, the impact source 7 rises and reaches a predetermined height, and at the same time, the contact of the guide roller 3 with the lever 4 is released (the guide roller 3 is disengaged from the lever 4). Simultaneously with the contact release, the wheel 2 instantaneously starts rotating (reverse rotation) in the direction of the arrow b by the torque acting according to the weight of the impact source 7, and the impact source 7 falls toward the floor 8.

As shown in FIG. 4A, an impact sound is generated when the impact source 7 collides with the floor 8, and the impact source 7 is repelled by its own elasticity. At this time, the wheel 2 continues to rotate in the direction of arrow b due to inertia.
It stops when 13a comes into contact with the locking member 13b. The lever 4 continues to rotate in the direction of the arrow a despite the reverse rotation of the wheel 2, and contacts the guide roller 3 before the repelled impact source 7 falls again on the floor 8 to release the impact source 7. (See FIG. 2B).

During the time from the start of reverse rotation of the wheel 2 to the drop of the impact source 7 to the floor 8, the repulsion and re-fall of the impact source 7, the lever 4 moves from the position where the contact with the guide roller 3 is released to the guide roller 3. 3 needs to be rotated to a position where it can come into contact again. Therefore, by controlling the transmission device 12 of the motor 5, the rotation speed of the lever 4 is adjusted to a desired value, so that the impact roller 7 is repelled and before the guide roller is dropped on the floor 8 again. 3 can be brought into contact with the lever 4.

As described above, in the automatic floor impact sound generating device A, the lever 4 is continuously rotated by continuously driving the motor 5, whereby the lever 4 is brought into contact with the guide roller 3 every time the lever 4 rotates. The impact source 7 can be raised to a predetermined height and dropped, and the lever 4 can be brought into contact with the guide roller 3 before the impact source 7 that has collided with the floor surface 8 and repelled falls again.

Accordingly, it is possible to reliably generate a floor impact sound with a predetermined impact force (N) and impact time (ms).

In the above embodiment, the mounting table 1 of the frame 1 is used.
The wheel 2, the lever 4 and the drive system of the lever 4 are arranged above “a”. However, these need not necessarily be arranged on the mounting table 1 a. good. That is, when the impact source 7 is dropped on the floor 8, the drop height is a problem. Therefore, it is possible to secure the height of the impact source 7 even if a pulley is arranged on the mounting base 1a and the string-shaped member is wound around a wheel provided at an appropriate height below through the pulley. Become.

As described above, the wheel 2 and the lever 4 constituting the automatic floor impact sound generator A and the drive system for driving the lever 4 are configured to be mounted at desired positions on the frame 1 so that the apparatus can be mounted. It is possible to reduce the overall weight, and it is possible to configure an automatic floor impact sound generating device that is advantageous for carrying.

[0056]

As described in detail above, in the automatic floor impact sound generating apparatus according to the present invention, an impact source having a predetermined mass and structure is raised to a certain height and dropped to fall on the floor surface. An impact sound can be generated by the collision. Therefore, at the time of evaluation of the floor, it is possible to mechanize the impact source without dropping the impact source by hand, and to rationalize the work.

The mechanism for raising the impact source is a winding of a cord-like member by a wheel. By converting the height required for the impact source into an arc, the height of the entire apparatus can be kept low. In addition, since the impact source is raised and dropped by the contact between the guide roller provided on the wheel and the continuously rotating lever and the release of the contact, the mechanism can be simplified.

Further, since the wheel does not make sliding contact with other parts, there is no need to consider wear and the wheel can be operated in a stable state for a long time.

By adjusting the rotation speed of the lever, even if the guide roller is disengaged from the lever and the wheel reversely rotates and the impact source falls, the impact source repels the floor surface. The lever contacts the guide roller and can be raised before the impact source that has fallen onto the floor again. For this reason, it is possible to reliably stop the drop of the impact source at once.

[Brief description of the drawings]

FIG. 1 is a front view illustrating a configuration of an automatic floor impact sound generation device.

FIG. 2 is a side view illustrating the configuration of the automatic floor impact sound generation device.

FIG. 3 is a diagram illustrating a process of raising an impact source.

FIG. 4 is a view for explaining a process of raising a dropped impact source again.

FIG. 5 is a diagram illustrating a conventional bang machine.

FIG. 6 is a diagram illustrating a configuration of a conventional device for dropping an impact source.

[Explanation of symbols]

A Automatic floor impact sound generator H Drop height of impact source L Length of lever (distance from lever rotation axis to end) S Distance between wheel rotation axis and lever rotation axis T Wheel rotation Distance between shaft and guide roller shaft 1 Frame 1a Mounting base 1b Strut 1c Shock source guide 2 Wheel 2a Rotating shaft 2b Groove 3 Guide roller 3a Shaft 3b Roller 4 Lever 4a Rotating shaft 4b End 5 Motor 6 String member 7 Impact source 8 Floor 9 Bearing 10 String guide 10a Stand 10b Roller 11 Measuring member 12 Transmission device 13 Stopper 13a Contact 13b Locking member

 ──────────────────────────────────────────────────の Continued on the front page F term (reference) 2G047 AA00 AA10 AA11 AB04 BC03 CA03 EA13 EA14 2G061 AA13 AB04 CA08 CA13 CA20 DA01

Claims (1)

[Claims] 1. An impact source that collides with a floor to generate an impact sound, a string member connected to the impact source, a wheel rotatably configured to wind the string member, and a rotation center of the wheel. A guide roller disposed at a position separated from the wheel by a predetermined distance and having an axis parallel to the rotation axis of the wheel, and having a rotation center at a position separated from the rotation center of the wheel by a predetermined distance and from the rotation center The guide roller is formed with a distance to one end having a size corresponding to a size obtained by adding a distance from a rotation center of the wheel to a rotation center and a distance from the rotation center of the wheel to a guide roller. An automatic floor impact sound generating device, comprising: a lever that rotates a wheel by engaging with the motor; and a motor that drives the lever.