JPH07100305B2 - Polishing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a technique effectively applied to a rotary polishing device and further to a polishing cloth cutting device in a polishing device having a polishing cloth paper feeding mechanism. .

[Prior Art] The present applicant has previously proposed an invention relating to a rotary polishing apparatus using sandpaper as shown in FIG.
-45619). In this type of rotary polishing device, a sandpaper wheel 4 formed by radially attaching a plurality of sandpapers (or polishing cloths) 3 is fixed to a rotating shaft 2 of a wheel machine 1 having a motor and a speed change mechanism, By rotating this sandpaper wheel, a workpiece 5 such as a metal product such as an aluminum die cast product or a woodworking product
Is pressed to deburr or polish the surface. In the polishing apparatus, the back of the sandpaper 3 is backed up by the elastic brush 6, so that it is possible to polish a product having an uneven and complicated shape.

However, in a polishing apparatus using sandpaper, the abrasive grains of the sandpaper may fall off or be unevenly worn, and good polishing may gradually become difficult. Therefore, it is necessary to replace the sandpaper. Therefore, in the polishing apparatus according to the above-mentioned prior application, a sandpaper automatic feed-out mechanism is provided in the sandpaper wheel, and a longer sandpaper is used in advance.
The sandpaper is rolled up inside and the centrifugal force is used to automatically send out the sandpaper little by little to save the trouble of replacement.

[Problems to be Solved by the Invention] However, sandpaper damaged by polishing is
There is no problem if the base material is completely worn, but
At the tip of the sandpaper where abrasive particles have fallen off or uneven wear has occurred,
The base material made of paper or cloth remains, which interferes with the polishing and makes it impossible to continue good polishing. Therefore, in the polishing apparatus provided with the above-mentioned sandpaper feeding mechanism, it is necessary to interrupt the polishing operation and manually remove the excess base material at the tip of the sandpaper caused by the abrasion by using scissors or the like. There was a problem that it should not happen.

[Object of the Invention] An object of the present invention is to automatically cut an excess base material at the tip of the sandpaper that has been sent out in accordance with the occurrence of abrasive grain dropout or uneven wear in a polishing apparatus equipped with a sandpaper sending-out mechanism. It is to be removed continuously, so that good polishing can be continuously performed.

[Means for Solving the Problems] The present invention is to mount a cutter on a housing side wall of a wheel machine at a predetermined distance from a center of rotation of a sandpaper wheel so that a cutting edge is opposite to a rotation direction of the sandpaper. Is.

[Operation] According to the above-mentioned means, when the sandpaper is fed out by the feeding mechanism, the tip end portion of the sandpaper vigorously collides with the cutter, and the excess base material at the tip end of the sandpaper is automatically removed by the amount fed out. You will be able to disconnect.

[Embodiment] FIG. 1 shows an embodiment of a polishing apparatus according to the present invention.

The polishing apparatus of this embodiment includes bearings 1a, 1 provided on the upper part of the housing of a wheel machine 1 including a motor and a transmission.
A rotary shaft 2 having a sandpaper wheel 4 attached to its tip is rotatably supported by b. A driven pulley 2a is fixed to the rear end of the rotary shaft 2, and a driven pulley 2b attached to the drive shaft 1c of the wheel machine 1 and the driven pulley described above.
The belt 8 wound between 2a transmits the rotational force of the motor to the rotary shaft 2 to rotate the sandpaper wheel 4.

A plurality of sand papers 3 are radially attached to the sand paper wheel 4, and a backup brush 6 is arranged on the surface of each sand paper 3 opposite to the rotation direction. Hereinafter, in this embodiment, a paper or cloth base material having abrasive grains bonded thereto with an adhesive is referred to as sand paper.

Each sandpaper 3 is held in the sandpaper wheel 4 in a wound state, and a sending-out mechanism for gradually sending out the sandpaper 3 by detecting a change in angular velocity due to polishing work is provided in the wheel.

Further, in this embodiment, the pedestal 1e is formed on the front wall 1d of the housing of the wheel machine 1, and the cutter 9 is fixed to the pedestal 1e with bolts or the like. The cutter 9 is formed in a substantially L-shape so that the blade tip 9a corresponds to the mounting position of the sandpaper wheel 4 and is separated from the front wall 1d of the housing by an appropriate distance, and the blade tip 9a is substantially vertical. It is fixed. Moreover, in this case, the cutter 9 is attached so that the blade edge portion 9a faces the direction opposite to the traveling direction of the sandpaper 3 in correspondence with the rotation direction of the sandpaper wheel 4.

As a result, when the sandpaper 3 is gradually delivered along with the polishing work, the tip of the sandpaper 3 comes to intersect with the blade edge portion 9a of the cutter, and the base material is struck against the blade edge portion 9a by the momentum of rotation at that time. In this way, it is cut off one after another and cut into a substantially uniform length. However, the tip of the sandpaper 3 after cutting is made to pop out longer than the tip of the back-up brush 6 on the back part, so that the tip of the brush 6 can be prevented from coming into contact with the work 5 and being worn.

The cutting edge 9a of the cutter 9 is formed into a sawtooth shape or a wavy shape, whereby the base material of the sandpaper colliding with the cutting edge portion 9a collides obliquely when viewed locally. It is designed to have good sharpness.

Further, in this embodiment, a long hole 9c is formed in the attachment base portion 9b of the cutter 9 along a direction orthogonal to the cutting edge portion 9a, and the position can be adjusted by a bolt 9d inserted into the long hole 9c ( (See FIG. 2). That is, by loosening the bolt 9d, moving the cutter 9 along the long hole 9c, and tightening the bolt 9d again, the distance from the blade tip 9a to the rotation center of the wheel 4 can be changed. There is. Thereby, the length of the sandpaper 3 can be adjusted. Further, the cutter 9 can be replaced when the blade tip 9a is worn.

Next, FIG. 4 shows an embodiment of a sandpaper wheel having a sandpaper delivery mechanism.

That is, a plurality of locking pieces 11 are fixed to one end of a cylindrical casing 10 so as to project in parallel with each other along the circumference, and the locking pieces 11 are opened outward. It has a fitting recess 11a. The base 6a of the backup brush 6 for sandpaper is laterally engaged with and held in the engaging recess 11a.

Inside the one side wall 10a of the casing 10, a cylindrical support shaft 13 is fixedly provided so as to be located at the center of the casing, and the base of the support shaft 13 has a pair of engagement pins 14a. A gear 14 having a large diameter is rotatably fitted. A gear 15 having a small diameter that meshes with the gear 14 is rotatably attached to the inner surface of the side wall 10a of the casing 10. An adjusting screw 16 is fixed to the outer end of the shaft 15a of the gear 15 and is constantly urged to the outside of the side wall by a spring 17 fitted to the shaft 15a. A stopper pin (not shown) is planted on the side surface of the gear 15, and the stopper pin is formed in the casing side wall 10a at equal intervals.
The engagement with 8 prevents rotation of the gears 15 and 14 in the normal state. When the adjusting screw 16 is pushed in by the spring force of the spring 18, the stopper pin is disengaged from the engaging hole 18, and the gears 15 and 14 are rotatable.

Then, the center support shaft 13 of the casing 10 is fitted with an automatic feeding device 20 which will be described in detail later.
A cylindrical sand paper holder 7 is fitted to the tip of the member 13. Therefore, when the adjustment screw 16 is rotated while being pushed, the stopper pin of the gear 14 is disengaged from the engagement hole 18 and the gear 14 is rotated, and the entire automatic feeding device 20 is rotated via the engagement pin 14a, and further the rotation thereof. Is the engaging pin
The sandpaper 3 transmitted to the sandpaper holder 7 via 20a and wound around the holder can be sent out.

The holder 7 has a locking piece 7a on the outer peripheral surface thereof, and the ends of the pair of sandpapers 3 are inserted and held in the locking piece 7a. The sand paper 3 held by the holder 7 is inserted one by one between the locking pieces 11, 11 ... Of the casing 10 when the holder 7 is fitted to the support shaft 13. At this time, each sandpaper 3 is attached so that the back side of the polishing surface contacts the backup brush 6.

After the automatic feeding device 20, the sandpaper 3 and the backup brush 6 are attached as described above, the lid 10b is covered so as to close the opening end of the casing 10, and the end of the spindle 13 protruding from the lid 10b is covered. Tighten the nut 1 on the thread 13a.
By screwing 9 together and tightening, the entire sandpaper wheel is integrated.

A plurality of cutouts 7b are formed at the end portion (left side in the figure) of the sandpaper holder 7, and the engagement pins 20a protruding from the automatic feeding device 20 are engaged with the cutouts 7b. Also,
An engaging recess (described later) that engages with the engaging pin 14a on the side surface of the gear 14 is formed on the opposite surface of the automatic sending device 20. The casing 10 and the sand paper holder 7 are rotated by receiving the rotational force from the automatic feeding device 20, respectively.

Next, referring to FIG. 5 to FIG.
A first example of the specific configuration of the above will be described.

The automatic feeding device 20 of this embodiment has a through hole 21a at the center.
On a donut-shaped base 21 having an oval through hole 22
A sliding plate 22 having a is mounted. The slide plate 22 includes two sets of slide plate retainers 23a, which are fixed to the peripheral portion of the upper surface of the base 21.
It is slidably held by 23b and 24a, 24b. The sliding plate 22 is biased in one direction by a compression spring 25 housed in a pair of housing grooves 21b formed on the upper surface of the base 21. One end of the spring 25 is brought into contact with an engaging portion 22a (see FIG. 8) projecting from the lower surface of the sliding plate 22 and
It is designed to be pressed. A weight 30 is attached to the spring contact side of the sliding plate 22. A guide key (not shown) is provided on the lower surface of the sliding plate 22 and is moved along a key groove 21c formed on the base 21.

An arcuate claw block 26 is fixed to the upper surface of the base opposite to the housing side of the spring 25, and the sliding plate 22 biased by the spring 25 comes into contact with the claw block 26 and is stopped. A pair of stopper claw shafts 27 are planted on both sides of the claw block 26 so as to project laterally, and stopper claws 28 are rotatably mounted on the stopper claw shafts 27, respectively. There is. Each stopper claw 28 has a claw portion 28a at the tip mounted in a slit 21e formed in the base 21 in an upward state, and a protruding piece 28b is formed laterally from the claw portion 28a. Storage recess 21d of the base 21 on the piece 28b
One end of a spring 29 housed inside is abutted and is constantly urged upward.

Further, on the upper surface of the sliding plate 22, a tooth profile plate 31 having, for example, 24 engaging teeth 31a is placed at the peripheral edge of the lower surface, and the engaging teeth 31a of the tooth profile plate 31 are slid on the sliding surface. The plate 22 is positioned so as to face the notches 22b on both sides of the plate 22. And
The notch portion 22b allows the claw portion 28a of the stopper claw 28 to engage with the engaging tooth 31a of the tooth profile plate 31.

Moreover, projections 28c are formed on the upper surfaces of the pair of stopper claws 28, and the projections 28a are brought into contact with the pair of pressing pieces 22d, 22e formed on both sides of the sliding plate 22. On the lower surface of the pressing pieces 22d and 22e, a lead surface inclined along the sliding direction of the sliding plate 22 is formed.
The pressing pieces 22d and 22e move the stopper claw 28 to the spring 29
Move up and down against. Moreover, the lead surfaces of the pressing pieces 22d and 22e are inclined in opposite directions, and when the sliding plate 22 moves forward, the left stopper claw 28 is lifted by the force of the spring 29 and the right stopper claw 28 is moved. Is rotated by being pushed by the lead surface and moving downward (away from the tooth profile plate 31).

Further, a gear 32 is joined and fixed to the upper surface of the tooth profile plate 31, and the gear 32 is attached to the periphery of the base 21 by a pin 33c.
Lower gear 33 of pinion 33 rotatably mounted by
meshed with a. The pinion 33 has an upper gear 33b that is integral with the lower gear 33a and has a smaller diameter than that of the lower gear 33a.A gear 35 placed on the gear 32 via a spacer 34 is meshed with the upper gear 33b. ing.

Further, the gears 32, 35 and the tooth profile plate 31 have through holes 2 of the base 21.
A through hole having substantially the same diameter as that of 1a is formed so that the support shaft 13 in the casing 10 shown in FIG. 1 can be inserted. Then, a donut-shaped lid member 36 is placed on the gear 35 so as to cover it, and the sliding plate retainer 23a,
23b and the claw block 26, the tooth profile 31, the gears 32 and 35, and the pinion 33 are held between the base 21 and the lid member 36 in a rotatable state.

Further, the above-mentioned pair of engaging pins 20a is fixed to the gear 35 so as to project above the lid member 36 from the central hole of the lid member 36, and the engaging pin 20a is the automatic feeding device of this embodiment. With the 20 set in the sandpaper wheel, by engaging with the notch 7b (see FIG. 3) at the end of the sandpaper holder 7, the rotational force is transmitted from the automatic feeding device 20 to the sandpaper holder 7. , These are rotated together.

On the other hand, a spacer 38 having two engaging recesses 38a is joined and fixed to the lower surface of the base 21.
The pair of engagement pins 14 on the gear 14 in the casing 10 described above.
By engaging a, the automatic delivery device 20 is rotated integrally with the casing 10.

In the automatic feeding device configured as described above, since the tip claw portion 28a of the right stopper claw 28 is engaged with the toothed plate 31 as shown in FIG. Relative rotation is blocked, and rotation of the sandpaper holder 7 engaged with the engagement pin 20a on the gear 35 is blocked. That is, the withdrawal of the sandpaper 3 is prohibited. When the sandpaper wheel is rotated in this state, the entire automatic feeding device is also rotated together. Then, since the weight 30 is fixed to one side of the sliding plate 22, the sliding plate 22 moves upward in FIG. 5 due to the centrifugal force associated with the change in the angular velocity. As a result, the cam lead surface of the pressing piece 22e on the side of the sliding plate 22 first pushes the right stopper claw 28 into the spring 29 and pushes it down to disengage the toothed plate 31. Therefore, the tooth profile 31 and the gear 32 can rotate relative to each other, and the gear 35 and the sand paper holder 7 can also rotate relative to each other. as a result,
Gear 35 and tooth profile due to the tensile force acting on the sandpaper
31 is rotated relative to the base 21 and the sandpaper is pulled out.

Then, when the tooth plate 31 starts to rotate relatively, the pressing piece 22
The lead surface of d acts so as to raise the left stopper claw 28 by the force of the spring 29. At this time, the tooth profile plate 31 is attached to the claw portion 28a.
The mountain parts of are facing each other. Then, when the tooth profile plate 31 is deviated by a half pitch, the left stopper claw 28, which has been in contact with the crest surface of the engaging tooth 31a until then, meshes with the valley of the engaging tooth 31a of the tooth profile plate 31 and further Prevent relative rotation. That is, the sending of sandpaper is prohibited.

On the other hand, when the rotation of the sandpaper wheel is stopped and the rotation speed starts to decrease, the centrifugal force acting on the sliding plate 22 becomes small, and the sliding plate 22 moves in the opposite direction (downward in FIG. 5).
Move to. At this time, first, the left stopper claw 28 is separated from the toothed plate 31 by the pressing piece 22d, and the sandpaper is slightly pulled out. When the tooth profile plate 31 relatively rotates by a half pitch, the right stopper claw 28 meshes with the engaging tooth 31a of the tooth profile plate 31 to prohibit relative rotation, that is, the sending out of the sandpaper.

As described above, when the sandpaper wheel changes in angular velocity, that is, when acceleration and deceleration are alternately repeated, the automatic feeding apparatus of this embodiment acts to feed out the sandpaper by one pitch. In this embodiment, the tooth profile plate 31, the gear 32, and the gear 32, are experientially adjusted so that the amount of one delivery is 6 to 9 mm from the relationship between the work material and the polishing area.
The tooth number ratio of 33a, 33b, 35 has been determined.

Therefore, the amount of one-time delivery is not limited to this, and may be determined according to the work (object to be polished). In the above embodiment, by exchanging the gears 32 and 35 and the pinion 33, it is possible to easily change to the most appropriate delivery amount corresponding to the work.

However, it is also possible to omit the gears 32, 33, 35 for changing the rotation of the tooth profile plate 31 and transmitting it to the sandpaper holder 7, and to adjust the feed amount only by the pitch of the tooth profile plate 31.

The sandpaper wheel of the above embodiment is provided with two mechanisms, a manual sandpaper sending mechanism and an automatic sending mechanism, but the present invention is effective when applied to a polishing apparatus having either one of the sending mechanisms. Is. However, when only the manual feeding mechanism is used, the polishing work must be interrupted when the sandpaper is fed, and therefore the work efficiency is further improved by providing the automatic feeding mechanism.

[Effects of the Invention] As described above, according to the present invention, in a polishing apparatus provided with an automatic sandpaper feeding mechanism, the blade edge of the sandpaper is located on the housing side wall of the wheel machine at a predetermined distance from the center of rotation of the sandpaper wheel. Since the cutter is attached so that it is in the opposite direction to the rotation direction of, the tip of the sandpaper vigorously collides with the cutter when the sandpaper is fed by the feeding mechanism, and the abrasive grains fall off. Excessive base material at the tip of sandpaper that is worn or unevenly worn is automatically cut,
Good polishing can be done continuously.

In addition, the sandpaper wheel is equipped with a mechanism that automatically detects the change in angular velocity due to polishing work and automatically sends out the sandpaper by centrifugal force, so it is possible to automatically send out the sandpaper and cut the excess base material at the tip of the sandpaper. Therefore, the polishing can be performed continuously without any interruption of the work.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a polishing apparatus according to the present invention, FIG. 2 is a side view as seen from the direction of arrow E in FIG. 1, and FIG. 3 is a structural example of a conventional polishing apparatus. 4 is an exploded perspective view showing a configuration example of a sandpaper wheel, FIG. 5 is a plan view showing an embodiment of an automatic feeding device, and FIG. 6 is a line AA ′ in FIG. FIG. 7 is a front view showing a part in section along the line, FIG. 7 is a sectional side view taken along line BB ′ in FIG. 5, and FIG. 8 is taken along line CC ′ in FIG. FIG. 1 ... Wheel machine, 3 ... Abrasive cloth paper (sandpaper), 4 ... Sandpaper wheel, 5 ... Grinding object (work), 6 ... Backup brush, 7 ... Sandpaper holder, 9 ... Cutter, 9a ... cutting edge, 10 ...
Casing, 16 …… Adjusting screw, 20 …… Automatic feeding device, 21 …… Base, 22,41 …… Sliding member (sliding plate, operating plate), 28 …… Stopper claw, 31 …… Tooth profile plate, 32 , 35
……gear.

Claims (1)

[Claims] 1. A plurality of polishing cloths are radially held, and a back member of each polishing cloth is supported by an elastic backup member to rotate a wheel for polishing the surface of an object to be polished. In the polishing device described above, the wheel is provided with an automatic feeding mechanism capable of gradually feeding the polishing cloth stored in the rolled-up state, and the cutting edge is provided outside the wheel in the rotation direction of the wheel. A polishing device, wherein a cutter is arranged so as to face the opposite direction, and the tip of the abrasive cloth paper rotated by the wheel is made to collide with the cutter and cut into a desired length.