JPH0537452U - Swing drive mechanism of polishing device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable the insertion of a polishing tool into a narrow space and to change the vibration speed of the polishing tool. [Structure] A cylindrical body 11 is fixed in a housing 1 of a polishing apparatus. Pin holes 17 are provided at a plurality of locations along the length of the cylinder.
Drill a and 17b. The swing arm 13 is swingably inserted into the cylinder. A groove 12 extending along the central axis direction of the pin hole is formed at one end of the swing arm, and pin holes 18a and 18b communicating with the pin hole are formed at an intermediate portion. The fulcrum pin 14 is selectively inserted into any one of the set of pin holes of the cylindrical body and the swing arm. The eccentric shaft 15, which is the driving shaft, is engaged with the groove of the swing arm. A polishing tool 9 is attached to the other end of the swing arm. Therefore, the power transmission section from the prime mover to the polishing tool becomes elongated. The rotation of the eccentric shaft changes to swinging around the fulcrum pin of the swing arm, and the polishing tool vibrates slightly. The vibration width changes if the insertion position of the fulcrum pin is changed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a swing drive mechanism of a polishing device.

[0002]

[Prior Art]

 The polishing apparatus is designed to vibrate the polishing tool at a high speed by a swing drive mechanism. The polishing tool is applied to wood or metal to smooth its surface.

Conventionally, the swing drive mechanism of this type of polishing apparatus has a structure as described in, for example, Japanese Patent Application Laid-Open No. 63-501782 and German Patent Application Publication No. 3840974. . That is, the drive shaft holding the polishing tool is provided so as to be orthogonal to the output shaft of the motor, and the two are connected via a rocking bearing, an arm, etc., and the rotational movement of the output shaft is transmitted to the drive shaft as a reciprocal angular movement. , The polishing tool is made to vibrate slightly.

[0004]

[Problems to be solved by the device]

 However, the above-mentioned conventional one has a complicated drive structure, and since the output shaft and the drive shaft are arranged at right angles and the polishing tool is attached to the tip of the drive shaft, the surface to be polished is If it is in a narrow space or in a corner, the drive shaft and parts of the grinder may not be able to be inserted into such space and therefore may not be ground. In addition, the position of the polishing tool may not be confirmed during the work.

Further, since the vibration speed of the polishing tool is constant, the vibration speed cannot be adjusted according to the property of the surface to be polished.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention comprises a cylindrical body having a pin hole fixed in a housing of a polishing device, and a groove extending along the central axis of the pin hole at one end. In addition, a swing arm that is swingably inserted into the cylindrical body having a pin hole that communicates with the pin hole in an intermediate portion, and a fulcrum that is inserted into the pin holes of the cylindrical body and the swing arm Adopting a swing drive mechanism structure of a polishing device including a pin, an eccentric shaft that is a driving shaft that engages with the groove of the swing arm, and a polishing tool attached to the other end of the swing arm. is doing.

[0007]

[Action]

 An oscillating arm passes through the cylinder, an eccentric shaft that is a driving shaft is provided on one end side of the cylinder, and a polishing tool is provided on the other end side of the cylinder. Therefore, the power transmission part from the driving part to the polishing tool can be formed to be elongated, and the polishing tool can be inserted into a narrow space or a corner. Further, since the polishing tool is attached to the tip of the swing arm, the swing arm can be formed into any shape according to the work purpose.

When the eccentric shaft, which is the driving shaft, rotates, the eccentric shaft slides within the vertical axis of the swing arm, so that the swing arm swings in the cylinder at high speed with the fulcrum pin as a fulcrum. Therefore, the polishing tool attached to the other end of the swing arm vibrates at high speed.

If the fulcrum pin is provided on the polishing tool side, the vibration width of the polishing tool becomes smaller, and conversely if it is provided on the driving shaft side, the vibration width becomes larger. Therefore, if the pin hole is set according to the purpose. Good. Alternatively, a plurality of pin holes may be provided to allow selection.

[0010]

【Example】

 DETAILED DESCRIPTION OF THE INVENTION One embodiment of a swing drive mechanism of a polishing apparatus according to the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 7, this polishing apparatus includes a cylindrical housing 1. The housing 1 is vertically divided into two parts, and is integrated by a plurality of assembly screws 2. Inside the housing 1, from the rear side to the front side, the battery 3, the switch 4, the motor 5 driven by the battery 3 via the switch 4, and the rotational motion of the motor 5 are converted into swing motion. The swing drive mechanism 6 is stored in order. A switch knob 7 for ON / OFF operation of the switch 4 is slidably attached to the upper part of the housing 1. A hole 8 is formed in the front portion of the housing 1, and an output portion of the rocking drive mechanism 6 for slightly vibrating the polishing tool 9 projects therefrom.

The switch 4 is connected to the switch knob 7 by a switch actuator arm 10 extending forward and backward along the inner wall of the housing 1, and by operating the switch knob 7, the battery 3 and the motor 5 are electrically connected. It is designed to connect to and disconnect from.

The motor 5 is a DC motor. Of course, it could be an AC motor. As shown in FIGS. 4 to 8, the rocking drive mechanism 6 has a rocking body 11 fixed in the housing 1, and a rocking groove 12 at one end inserted into the cylinder body 11 so as to be rockable. A movable arm 13, a fulcrum pin 14 that connects the swing arm 13 to the cylindrical body 11, an eccentric shaft 15 that is a driving shaft that engages with the groove 12 of the swing arm 13, and the other end of the swing arm 13. And an attached polishing tool 9.

The cylindrical body 11 extends in the front-rear direction in the housing 1, and a flange 11a on the rear end side is connected to a front portion of the motor 5 by a mounting screw 16 so as to surround the output shaft 5a. The portion 11b penetrates the hole 8 of the housing 1 to the outside and is supported by the inner edge of the hole 8. As a result, the cylindrical body 11 is fixed at a fixed position in the housing 1.

The rear portion 11c of the tubular body 11 located on the motor 5 side has a cylindrical shape, and the front portion 11b has a square tubular shape. The rectangular cylindrical peripheral wall of the front portion 11b is provided with pin holes 17a and 17b at a plurality of locations along its length.

The swing arm 13 is a quadrangular bar member whose cross-section has a vertical dimension equal to that of the tubular body front portion 11b and a small horizontal dimension. A groove 12 is formed at the rear end thereof, and a plurality of pin holes 18a and 18b are formed in the middle portion so as to correspond to the pin holes 17a and 17b of the cylindrical body 11. The groove 12 extends along the central axis direction of the pin holes 17a, 17b, 18a, 18b.

The pin holes 17a and 17b of the cylindrical body 11 and the pin holes 18a and 18b of the swing arm 13 are respectively set, and the fulcrum pin 14 is attached to and detached from the desired pin hole set. Has been inserted there. The fulcrum pin 14 is selectively inserted into any of the pin hole groups. The number of sets of pin holes is not limited to two, but one set or three or more sets may be provided.

The eccentric shaft 15 is fixed to the output shaft 5 a of the motor 5 and engages with the groove 12 of the swing arm 13. Since the groove 12 extends along the central axis direction of the pin holes 17, 17b, 18a, 18b as described above, the rotational movement of the eccentric shaft 15 is about the fulcrum pin 14 with respect to the swing arm 13. Will be transmitted in a swinging motion. The mounting portion 15a of the eccentric shaft 15 to the motor output shaft 5a is in contact with the inner peripheral surface of the cylinder front portion 11b via a needle bearing 19 in order to obtain smooth rotation of the eccentric shaft 15. .

The tip of the swing arm 13 projects outward from the tip of the tubular body 11, and dust does not enter the tubular body 11 through the gap between the projecting portion and the tubular body 11. Thus, the dustproof cover 21 is attached.

Further, the polishing tool 9 is detachably attached to the tip of the swing arm 13 with a tightening screw 22. The polishing tool 9 is one in which an abrasive material 23 such as sanding paper is attached to a holder 25 via a cushioning pad 24, and various abrasive materials 23 are prepared. The shape is not limited to the triangular shape shown. The holder 25 has a support rod 26 that is a bent rod, and the tip end of the swing arm 13 is inserted into the recess of the free end of the support rod 26, and is fastened with a tightening screw 22.

Next, the operation of the swing drive mechanism 6 of the polishing apparatus will be described. When the switch knob 7 is operated to the ON side at the time of starting the polishing apparatus, the switch 4 is switched and the motor 5 is started. As a result, the eccentric shaft 15, which is the driving shaft, rotates, and the eccentric shaft 15 slides in the groove 12 of the swing arm 13. Then, the swing arm 13 swings left and right at high speed in the cylinder 11 with the fulcrum pin 14 as a fulcrum, and the polishing tool 9 attached to the other end of the swing arm 13 vibrates at a high speed. Become.

An operator holds the housing 1 by hand and applies the polishing tool 9 to the surface of wood or metal to polish the surface. The fulcrum pin 14 is detachable, and if the fulcrum pin 14 is inserted into the pair of pin holes 17a and 18a on the side of the polishing tool 9, the vibration width of the polishing tool 9 becomes smaller. In that case, the work speed is slightly slower, but a finer finish surface can be obtained.

On the contrary, when it is inserted into the set of pin holes 17b and 18b on the eccentric shaft 15 side, the vibration width becomes large. In that case, the finish surface will be slightly rough, but the work speed can be increased.

Further, in this polishing apparatus, the swing arm 13 passes through the cylindrical body 11, the eccentric shaft 15 as a driving shaft is provided on one end side of the cylindrical body 11, and the other end side of the cylindrical body 11 is provided. There is a polishing tool 9. Therefore, the power transmission part from the driving part to the polishing tool is elongated, and the polishing tool can be inserted into a narrow space or a corner for polishing.

[0024]

[Effect of the device]

 Since the present invention is configured as described above, the power transmission section from the driving shaft to the polishing tool can be made elongated. Therefore, it is possible to insert a polishing tool into a narrow space or a corner and perform proper polishing work. Further, since the polishing tool is formed in front of the housing, its position can be confirmed during the work. Further, the drive structure can be simplified to facilitate the assembly.

Further, it is possible to obtain different vibration widths of the polishing tool only by providing the fulcrum pin at a desired position, and it is possible to obtain a tool suitable for a desired degree of surface finishing and working speed.

[Brief description of drawings]

FIG. 1 is a side view of a polishing apparatus having a swing drive mechanism according to the present invention.

FIG. 2 is a plan view of the polishing apparatus.

FIG. 3 is a rear view of the polishing apparatus.

FIG. 4 is a vertical sectional view of the polishing apparatus.

5 is a sectional view taken along line VV in FIG.

6 is a sectional view taken along line VI-VI in FIG.

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is an exploded perspective view of the swing drive mechanism.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Housing 5 ... Motor 6 ... Oscillation drive mechanism 9 ... Polishing tool 11 ... Cylindrical body 12 ... Groove 13 ... Oscillation arm 14 ... Support point pin 15 ... Eccentric shaft 17a, 17b, 18a, 18b ... Pin hole

Claims (1)

[Scope of utility model registration request] 1. A cylindrical body having a pin hole fixed in a housing of a polishing apparatus, a groove extending along a central axis direction of the pin hole at one end, and the pin hole at an intermediate portion. A swing arm that is swingably inserted into the cylindrical body having a pin hole communicating therewith, a fulcrum pin that is inserted into the pin hole of the cylindrical body and the swing arm, and a groove of the swing arm. An oscillating drive mechanism of a polishing apparatus, comprising: an eccentric shaft that is a driving shaft that engages with the eccentric shaft; and a polishing tool attached to the other end of the oscillating arm.