JP4401127B2 - Ceramic potter's wheel pedal device and pottery wheel pot equipped with the pedal device - Google Patents

Description

  The present invention relates to a pottery wheel pedal device, and more particularly to a pedal device for controlling the number of rotations of a turntable. The present invention also relates to a potter's wheel equipped with such a pedal device.

  A ceramic potter's wheel generally includes a turntable, a motor for rotationally driving the turntable, a support base to which the motor is attached, and an operation member for operating the rotational speed of the turntable. In such a pottery wheel, the potter can adjust the rotation speed of the turntable by operating the operation member.

  As an operation member of a ceramic potter's wheel, one having a pedal device has already been proposed (see, for example, Patent Documents 1 and 2). Such a pedal device generally includes a casing, an operation pedal, a variable resistor, and a connection cord. The operation pedal is attached to the casing so as to be rotatable about a horizontal axis. The variable resistor is provided inside the casing and is configured so that the resistance changes according to the operation angle.

In this pottery wheel, when the potter steps on the operation pedal with his / her foot to change the operating angle, the resistance of the variable resistor changes and the rotation speed of the turntable changes.
Japanese Patent Laid-Open No. 11-207713 US Pat. No. 3,796,105

  In the above-described conventional pottery wheel pedal device, when it is desired to change the posture or work while standing, it is usually necessary to once remove the foot from the pedal device.

  However, since the operation pedal is rotatable with respect to the casing as described above, when the foot is released, the relative angle with the casing changes and the resistance of the variable resistor changes, and the turntable changes. The rotation speed of will change. For this reason, the potter is forced to keep the same posture as it is or to change his posture or stand up with his feet on the pedal device in order to avoid changing the rotation speed of the turntable. The

  In addition, in the conventional pedal device, when the potter concentrates on the pottery, when the foot is moved from the pedal device or the foot is displaced, the rotation speed of the turntable changes, It may interfere with the pottery work.

  An object of the present invention is to provide a pottery wheel equipped with a pedal device capable of controlling the rotational speed of a turntable, and the rotational speed of the turntable does not change even if the potter stops applying operating force to the pedal device. There is in doing so.

Pedal apparatus according to claim 1, a turntable, a motor for rotating the turntable, and potter's wheel body having a support base for supporting the motor, and a pedal device for controlling the rotational speed of the turntable , A pedal device used for a potter's wheel provided with a housing part placed on the floor, a shaft disposed through the housing part, and a shaft around the shaft in the housing part An operation pedal that is mounted rotatably and is arranged on a shaft and an operation pedal for changing the number of rotations of the turntable according to a relative angle with the housing portion, and is provided so as to be press-contactable between the housing portion and the operation pedal. A resistance force generating mechanism having a friction member, and the resistance force generating mechanism restricts rotation of the operation pedal when no operation force is applied to the operation pedal.

  The pedal device according to a second aspect is the pedal device according to the first aspect, wherein the resistance force generating mechanism restricts the rotation of the operation pedal by a frictional force.

A pedal device according to a third aspect is the pedal device according to the first or second aspect , wherein the operation pedal is connected to both end portions of the shaft and is disposed so as to sandwich the housing portion from both sides facing each other via a gap. A pair of clamping parts. The resistance generation mechanism has a friction member disposed in a gap between the sandwiching portion and the housing portion. The sandwiching portion and the housing portion are pressed against each other via a friction member.

A pedal device according to a fourth aspect is the pedal device according to the third aspect , wherein the shaft is formed with screw grooves at both ends. The operation pedal further includes a plurality of nuts that are screwed to both ends of the shaft.

A pedal device according to a fifth aspect is the pedal device according to any one of the first to fourth aspects, wherein the gear is mounted on the shaft inside the housing portion, and is disposed inside the housing portion. with varying the resistance of the power supplied to the motor by the relative angle between the parts, that further comprise a variable resistor having a shaft portion which the gear is mounted to engage the gear.

A potter's wheel according to claim 6 includes a turntable, a motor body for rotationally driving the turntable, a support body supporting the motor , and a pedal for controlling the rotational speed of the turntable. The pedal device is mounted on the floor, etc., with a housing part, a shaft disposed through the housing part, and a housing part rotatably attached to the shaft around the shaft. An operation pedal for changing the number of rotations of the turntable in accordance with a relative angle with the housing portion, and a resistance force having a friction member disposed on the shaft so as to be press-contactable between the housing portion and the operation pedal And a generation mechanism, and the resistance generation mechanism regulates the rotation of the operation pedal when the operation force is not applied to the operation pedal.

  In the pedal device according to the first aspect, the rotation number of the turntable can be changed by changing the relative angle between the operation pedal and the casing when the potter steps on the operation pedal. On the other hand, the turntable is kept rotating at the same number of rotations because the rotation of the operation pedal is restricted by the resistance generating mechanism even when the potter's foot is removed and the operation force is no longer applied. It becomes possible. As a result, the potter can change his posture or stand up during the pottery, and can maintain an arbitrary number of rotations even if his feet are removed.

  In the pedal device according to the second aspect, specifically, the resistance force generation mechanism prevents the operation pedal from rotating when the operation force is not applied by the frictional force.

More specifically, in the pedal device according to the third aspect, the operation pedal is prevented from rotating when the operation force is not applied, by pressing the holding portion of the operation pedal and the housing portion through the friction member. Is done.

In the pedal device according to the fourth aspect , it is possible to adjust the magnitude of the frictional force between the holding portion and the housing portion by tightening or loosening the nut with respect to the rotation shaft.

The pedal device according to the fifth aspect has a simpler structure because the gear is arranged around the shaft in addition to the friction member.

In the ceramic potter's wheel according to claim 6 , even when the operating force does not act, since the rotation of the operating pedal is restricted when the operating force is not exerted by the resistance generating mechanism, the potter can apply the operating force to the pedal device. Even if the application is stopped, the turntable can continue to rotate at the same rotation speed.

[Overall configuration of pottery wheel]
FIG. 1 shows a pottery wheel 1 in which an embodiment of the present invention is adopted.

  The potter's wheel 1 includes a turntable 3, a pan 4, a motor 5, a support base 7, and a pedal device 9.

  The turntable 3 is a disk-shaped member, and work is performed on the upper surface side. Here, the turntable 3 is directly mounted on a rotating shaft (not shown) of the motor 5.

  The cradle 4 is a dish-like member disposed so as to cover the lower side and the side of the turntable 3, and is for receiving a cradle or the like that scatters or falls from the upper surface of the turntable 3.

  The motor 5 is for rotating the turntable 3, and here, a DD motor, preferably a DC brushless motor is used. The motor 5 is built in a motor cover 7 b (described later) of the support base 7.

  The support base 7 includes a top plate portion 7a, a motor cover 7b, and a leg portion 7c. The motor cover 7 b is formed on the lower surface side of the top plate portion 7 a and incorporates a control device (not shown) in addition to the motor 5. A power switch 8 and a forward / reverse switching knob 10 are provided on the side surface of the motor cover 7b. The leg portions 7c are attached to three locations on the lower surface side of the top plate portion 7a so as to extend downward.

[Pedal device]
The pedal device 9 is a device for controlling the number of rotations of the turntable 3, and as shown in FIGS. 2 to 5, the housing portion 11, the operation pedal 13, the shaft 31, and the variable resistor 15. And a friction member 17 and a connecting cord 21.

  The housing | casing part 11 is a plate member made from the aluminum alloy mounted in a floor, a stand, etc. A connecting cord 21 extends from the side surface of the housing 11. In addition, a bracket 25 is disposed inside the housing unit 11, and the variable resistor 15 is fixed to the bracket 25. A pair of side surface portions 11c of the housing portion 11 is formed with through holes 11d through which the shaft 31 is disposed, and supports the shaft 31 so as to be rotatable. The pair of side surface parts 11c are arranged separately from each other in a pair of sandwiching parts 13b (described later). In addition, a friction member housing recess 11e formed to be slightly recessed is formed around the through hole 11d of the pair of side surface portions 11c.

  The operation pedal 13 is a member that a potter puts on his / her foot to operate, and is attached to the housing 11 via a shaft 31 so as to be rotatable. The operation pedal 13 includes a pedal portion 13a and a pair of sandwiching portions 13b that extend downward from the central portion in the longitudinal direction of the pedal portion 13a.

  The shaft 31 is a rod-like member that is disposed through the casing 11 and the pair of sandwiching portions 13b, and is fixed to the sandwiching portion 13b by attaching nuts 30 to thread grooves formed at both ends. ing. A gear 33 is attached to the central portion of the shaft 31 in the axial direction so as to be integrally rotatable. The gear 33 is engaged with a gear 41 (described later) fitted to the shaft of the variable resistor 15.

  The variable resistor 15 is for changing the resistance value in order to change the current flowing through the motor 5. The variable resistor 15 has a gear 41 fitted on a shaft, and the resistance value is changed when the gear 41 rotates.

  The friction member 17 is a member for restricting the rotation of the operation pedal 13 in a state in which no operation force is applied to the operation pedal 13 by, for example, releasing the foot of the potter. The friction member 17 is a member formed in a disk shape from a bakelite with cloth, and is disposed one by one in the gap between the friction member housing recess 11e of the housing 11 and the holding portion 13b of the operation pedal 13. Has been. It is preferable that the friction member 17 is not particularly fixed with respect to the friction member housing recess 11e and the holding portion 13c and is relatively rotatable. The clamping portion 13b and the side surface portion 11c are in pressure contact with each other via the friction member 17, and the pressure contact force is adjusted by the screwing amount of the nut 30, thereby adjusting the friction force of the friction member 17. it can. Specifically, when the potter puts his / her foot on the operation pedal 13 to operate, the magnitude of the frictional force is allowed to rotate the operation pedal 13. When the button is released, the rotation of the operation pedal 13 is restricted.

  The connection cord 21 is for electrically connecting the housing portion 11 and the motor cover 7b of the support base 7, and extends from the housing portion 11 so that the tip portion is coupled to the motor cover 7b.

  When using the ceramic potter's wheel 1 configured as described above, first, the power switch 8 is turned on and the operation pedal 13 is stepped on with a foot. Then, when the shaft 31 and the gear 33 rotate integrally with the operation pedal 13, the gear 41 fitted on the shaft rotates to change the resistance value of the variable resistor 15. As a result, the voltage applied to the motor 5 changes, the motor 5 is driven to rotate, and the turntable 3 starts to rotate. The potter can turn the turntable 3 at a high speed by stepping on the operation pedal 13 deeply.

  Thus, in the potter's wheel 1, the rotation number of the turntable 3 is changed by the potter stepping on the operation pedal 13 to change the relative angle between the operation pedal 13 and the housing portion 11. This relative angle is maintained by the frictional force generated between the friction member 17 and the sandwiching portion 13c and the side surface portion 11c even when the potter takes his foot off the operation pedal 13, so that the turntable 3 has the same rotational speed. It is possible to continue to rotate. As a result, the potter can continue the work by, for example, removing his / her foot from the pedal device 9 and changing his / her posture during the pottery work.

  Further, in this pedal device 9, by tightening or loosening the nut 30 with respect to the shaft 31, the pair of sandwiching portions 13b bend, and the magnitude of the frictional force between the sandwiching portion 13b and the side surface portion 11c is adjusted, It is possible to adjust the magnitude of the frictional force between the friction member 17, the clamping part 13b, and the side part 11c.

[Other Embodiments]
The pedal device is not limited to the cable extension type, and may be directly provided on the support base 7.

  According to the present invention, the rotation speed of the turntable can be changed by the potter stepping on the operation pedal to change the relative angle between the operation pedal and the housing. Even if the potter's foot is separated from the operation pedal, it is maintained by the resistance generating mechanism. For this reason, the turntable can continue to rotate at the same number of revolutions after the potter leaves the control pedal, so that the potter can continue to work by changing his posture or standing up. Will be able to.

The side view which shows partially the ceramic potter's wheel in which one Embodiment of this invention was employ | adopted. The side view which shows the pedal apparatus of the said potter's wheel in a closed position partially fractured | ruptured. The longitudinal cross-sectional view which shows the said pedal apparatus in an open position. The rear side view which shows the said pedal apparatus partially transparently. Bottom view showing the pedal device partially broken

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ceramic potter's wheel 3 Turntable 5 Motor 7 Support stand 9 Pedal device 11 Housing | casing part 13 Operation pedal 15 Variable resistor 17 Friction member 21 Connection cord 30 Nut 31 Shaft 33 Gear

Claims (6)

A ceramic art provided with a turntable , a wheel body having a motor for rotationally driving the turntable, a support base for supporting the motor, and a pedal device for controlling the number of rotations of the turntable A pedal device used for a wheel ,
A housing unit placed on the floor ,
A shaft disposed through the housing part;
An operation pedal, which is mounted on the housing part so as to be rotatable together with the shaft around the shaft, and changes the number of rotations of the turntable according to a relative angle with the housing part;
A resistance force generating mechanism having a friction member disposed on the shaft and provided so as to be press-contactable between the housing portion and the operation pedal ;
The resistance force generating mechanism restricts rotation of the operation pedal when no operation force is applied to the operation pedal . The resistance generation mechanism regulates the rotation of the operation pedal by a frictional force;
The pedal device for a potter's wheel according to claim 1. The operation pedal has a pair of sandwiching portions that are connected to both ends of the shaft and are disposed so as to sandwich the housing portion from both sides facing each other via a gap,
The resistance generation mechanism has a friction member disposed in the gap between the sandwiching portion and the housing portion,
The clamping part and the casing part are pressed against each other via the friction member,
The pedal device for a potter's wheel according to claim 1 or 2 . The shaft has threaded grooves at both ends,
The operation pedal further includes a plurality of nuts that are screwed to both ends of the shaft.
The pedal device for a potter's wheel according to claim 3 . A gear mounted on the shaft inside the housing part;
A shaft portion that is disposed inside the housing portion, changes a resistance of electric power supplied to the motor according to a relative angle between the operation pedal and the housing portion, and is fitted with a gear that engages with the gear. A variable resistor having
The pedal device for a potter's wheel according to any one of claims 1 to 4 . A turntable, a motor for rotating the turntable, and a support base for supporting the front SL motor, a potter's wheel body having a
A pedal device for controlling the rotation speed of the turntable, and
The pedal device is
A housing unit placed on the floor,
A shaft disposed through the housing part;
An operation pedal, which is mounted on the housing part so as to be rotatable together with the shaft around the shaft, and changes the number of rotations of the turntable according to a relative angle with the housing part;
A resistance force generating mechanism that is disposed on the shaft and has a friction member that can be press-contacted between the housing portion and the operation pedal. The resistance force generation mechanism applies an operation force to the operation pedal. A ceramic potter's wheel characterized by restricting the operation pedal from rotating when not being operated .

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