JPH0798309B2 - Return type polishing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is mainly used for polishing wood such as furniture and joinery.
In addition to the functionally applicable range, the present invention relates to a reciprocating polishing device used for polishing synthetic resin or metal.

<Prior Art> A frame part of a door or a decorative plate that is generally used for furniture or fittings, and a member having a linear concave-convex line formed along the outer periphery is machined similarly to other decorative surfaces. After forming the uneven lines, the material is polished and the coated surface is finished and the coated surface is polished.

For example, when mechanically polishing the surface of a frame material (working material) 51 on which arc-shaped concavo-convex strips 51a and 51b are formed as shown in FIG. 9, a straight table 52 as shown in FIG. Processed material 51
And feed it linearly, and above it, stretch the endless belt-shaped sandpaper 54 wound around the rollers 53, 53 along the feed direction of the work material, which is opposite to the feed direction. While driving the belt in the direction
A device is known in which the sandpaper 54 between 53 and 53 is pressed against the surface of the processed material with a pad 55, and the pressing surface of the pad 55 is an uneven surface along the uneven lines 51a and 51b.

In addition, there is also known a device in which sandpaper or the like is previously attached to the entire pressing surface of the pad 55 and pressed against the surface of the processed material to mechanically reciprocate the pad 55 itself in the direction of the ridges and valleys. .

<Problems to be Solved by the Invention> However, the conventional belt-shaped sandpaper has the following problems.

B) A strong tension is generated on the belt-shaped sandpaper, and the peaks of the processed material are strongly ground when pressed by the pad, but the valleys and steep slopes cause poor polishing or deep grooves,
It is impossible to polish fine grooves and corners at the edges of processed materials.

B) As mentioned above, the contact pressure of the belt on the uneven surface is non-uniform, so if the valleys (grooves) are sufficiently ground, the peaks will be over-polished, and in the polishing after coating, there will be parts where the paint is scraped off. It is impossible to polish the coated surface.

C) Since the pad is pressed against the inner surface of the driven belt, the back surface of the belt and the pad are heavily worn, and it is necessary to attach a wear resistant resin to the pad surface or add a wear resistant material such as graphite.
There is a large loss in labor and cost.

D) Since the pad is pressed against the driving belt to give resistance, the driving force of the belt-shaped sander becomes excessive and it is necessary to firmly clamp the processed material on the bed, but the belt has high tensile strength. It is not economical because it is necessary to increase the power of the feed drive by using.

E) Since the entire sandpaper is always used, there is a large difference in polishing performance between the beginning and end of use (at the end of its life), resulting in variations in finishing accuracy.

Also, in the case of moving the pad back and forth, vibration due to the backward movement is severe, so a vibration-proof structure of the machine body and a structure with high safety are required, especially when the backward movement is in the direction opposite to the feed direction of the processed material. There is a drawback that the difference in vibration and drive resistance is large.

(F) In the conventional belt type, as shown in FIG. 9, unless the pad width is made narrower than the belt width, the belt-shaped sandpaper comes off the pad, so that the entire belt cannot be used.

<Means for Solving the Problems> The present invention solves the above problems, and in particular, provides a polishing machine that has less drive resistance and vibration for feeding a work material and driving on the sandpaper side and has a good polishing performance for uneven ridges. A table 6 for the purpose of providing a processing surface 8a on which a processing material 8 having a concavo-convex line formed along the longitudinal direction is placed and the material is intermittently fed in a feeding direction along the longitudinal direction, and the above-mentioned processing. Belt-shaped sandpaper 26 stretched over the width of the processed material 8 on the material 8.
And a pad 43 made of an elastic material whose end surface forms a concave-convex surface that fits the concave-convex line of the processed surface 8a, and presses the sandpaper 26 along the processed surface. A mechanism for polishing the machined surface by reciprocating in the direction of the ridges and valleys is provided, and the pads 43 are two or more corresponding pads 43 that are pressed against the same ridges and ridges in proximity to the feed direction of the workpiece 8. 43, and the pad 43,43 and sandpaper 26
It is characterized in that a mechanism is provided for reciprocating and moving at the same time in the opposite directions along the concavo-convex line.

<Operation> The processing surface of the processing material 8 which is fed in a fixed direction on the table 6.
A plurality of pads 43, 43 are pressed against the 8a via an abrasive material, and reciprocate in a direction coinciding with the feed direction of the processed material 8. As a result, the work material 8 is sent on the table and is moved back and forth by the plurality of pads 43, 43 so that the abrasive material (sandpaper 26
Etc.). At this time, since the pads 43, 43 simultaneously reciprocate in the opposite directions, the vibrations generated by the returning motions of the pads 43, 43 are canceled out, and the vibration and noise of the device are not generated. There is no great resistance to feeding.

<Embodiment> The embodiment of the present invention shown in the drawings will be described in detail below. A machine body 1 of a polishing apparatus is provided upright on a main body frame 2 having a driving device for feeding and the like and a rear end side of the main body frame 2. A table 6 having a post frame 3 and a mounting surface 6a having a horizontal upper surface on the front end of the main body frame 2 and a horizontal straight guide 4 protruding from the rear end is installed in the left and right longitudinal directions. Has been done. Inside the table 6, a feed roller 7 having a circumferential surface slightly protruding from the above-mentioned mounting surface 6a is axially supported in parallel in the front-rear direction. The rotation of the feeding roller 7 and the mounting surface 6a and the guide 4 The processed material 8 (see FIGS. 5 and 7) is linearly fed in the left-right direction by and.

An elevating slide device 9 is provided on the upper right side of the post frame 3.
The arm frame 11 is attached to the front of the arm frame 11 so as to be adjustable in the vertical position, and two upper and lower guide rods 12 are attached to the tip of the arm frame 11 in parallel to the left and right direction. Left and right sliders 13, 13 are supported on the guide rod 12 so as to be movable left and right,
Further, each slider 13 is provided with a plate-shaped bracket 14 which projects in parallel with each other so as to face each other in parallel and project to the front side.

A sander frame 16 is attached to the inner surface of each bracket 14 in the vertical direction, and
It is pivotally attached by a lower mounting shaft 17 and is tiltably adjustable by an upper fixing screw 18. Reference numeral 19 denotes an arcuate adjustment hole through which the fixing screw 18 is inserted, which has an arc centered on the mounting shaft 17.

As shown in FIGS. 6 and 7, the sander frame 16 has a vertically long box shape, and a top roller 22 is rotatably supported in the left-right direction at its upper end via a bearing bracket 21. Further, a swing arm 23 is pivotally supported at the upper end so that the lower end is swingable on both lower front and rear sides of the sander frame 16, and a lower roller 25 is rotatable on the outer side of the tip of each swing arm 23 via a bearing 24. Is supported by. An endless belt-shaped sandpaper 26 (Note: the belt material is not limited to paper) is wound around the outer circumferences of the top roller 22 and the lower rollers 25, 25, and the lower end of each swing arm 23 is always outside. The sandpaper 26 is biased in the direction by a spring (not shown), and the tension of the sandpaper 26 is maintained by the opening / closing biasing force of the swing arm 23.

The outer end of the bearing bracket 21 has a mechanism that can adjust the vertical movement of the shaft 27 of the top roller 22 to adjust the movement of the sandpaper 26 to the left and right, and the adjustment screw 28 and the return spring 29. Is provided. Axis 27 with adjusting screw 28
The outer end of the is pushed and tilted downward, and when it is loosened, the spring 29 tilts upward.

A chain wheel 31 is concentrically mounted on the outer side of the top roller 22, and the chain wheel 31 rotates integrally with the top roller 22 only when the chain wheel 31 is rotated in a fixed direction by a built-in ratchet mechanism or the like (not shown). , It has a mechanism that idles when rotating in the reverse direction. 4 and 6
As shown in the figure, a chain 32 is wound around the chain wheel 31, one end of the chain is locked to a rod of an air cylinder 33 attached to the outside of the sander frame 16, and the other end is locked to the side of the sander frame 16. Each is connected to the free end of the retracted return spring 34. By reducing the cylinder 33, the top roller 22 is rotated by a certain angle, the sandpaper 26 is rotated by a certain amount, and when the cylinder 33 is released, the chain wheel 31 returns to the original position by the spring 34. The delivery mechanism 35 configured as described above
Thus, the sandpaper 26 is intermittently and quantitatively sent out, and the old and new sandpaper is replaced in the pad 43 portion described later.

An air cylinder 36 is vertically housed and attached above the inside of the sander frame 16, and a tip of a cylinder rod 37 at the lower end thereof is connected to a pad pressing rod 39 via an escape mechanism 38 for allowing the stroke of the rod to escape. ing.
A cushion spring 42 is inserted between the spring receiver 41 attached to the cylinder rod 37 and the escape mechanism 38,
The pushing drive of the cylinder rod 37 is released by sliding in the relief mechanism 38, but the pushing force is transmitted to the pushing rod 39 via the spring 42.

The tip of the pressing rod 39 is slidably protruded to the lower end of the sander frame 16, and the belt-shaped sandpaper 26 is provided at the tip between the lower rollers 25, 25 and the surface of the processed material 8 is processed.
A pad 43, which presses against 8a, is detachably attached. The pad 43 is made of elastic rubber or synthetic resin material, and is fixed to the pad base 44 by sticking or the like on the upper surface thereof, and the pad base 44 is attached to the pressing rod 39.

As shown in FIG. 1 and FIG. 2, the pad 43 has a shape of a block having a rectangular shape in plan view, with the left and right upper or lower corners cut off at the notches 46, and the left and right pads 43 are as shown in FIG. It has a symmetrical shape. This is to enable polishing up to the corners of the frame-shaped material 8 as shown in FIG.

The lower surface of the pad 43 is the surface shape of the processed material 8 (processed surface).
It has an uneven surface that matches the uneven surface of the work piece, and a cut 47 with a certain depth is formed in the front-back direction on the lower surface of the work piece. It has a structure that enhances performance.

As shown in FIG. 5, a motor 48 is installed in the arm frame 11.
And gears 61 and 62 of the same diameter that are driven to rotate by the motor 48 and mesh with each other. Crank mechanisms 63 and 63 are provided at the shaft ends of the gears 61 and 62, respectively. It is connected to the back of a slider 13 that moves left and right on the top 12. As a result, the motor 48 cranks 6
3,63 simultaneously reversely rotate, and the pair of sliders 13,13, that is, the sander frame 16 are slid back and forth in the left and right directions, and the pads 43,43 accordingly return in the opposite directions.

In order to grind the processed material 8 with the above-mentioned device, the processed material 8 is placed on the table 6 in the left-right direction with the uneven processed surface facing upward, and the sandpaper 26 is placed on the processed surface with two pads 43. The work piece 8 is pushed in close contact, the feed roller 7 is rotated and the work material 8 is fed leftward or rightward, and the pads 43, 43 are driven backwards by the motor 48 in the left and right directions. Polish.

When the polishing performance of the sandpaper 26 deteriorates due to the above polishing, the air cylinder 33 is driven to send the sandpaper 26 a required length corresponding to the front and rear widths of the pads 43, 43,
Polish with new sandpaper again. During the polishing, the height of the pad 43 is raised and lowered by the slide device 9
The pressing force is adjusted and set by the cylinder 36, and the inclination of the pad 43 in the front-rear direction is adjusted and set by appropriately rocking the sander frame 16 around the mounting shaft 17 and tightening the fixing screw 18. It At this time, when the processed material 8 does not contact the feed guide 4, a straight auxiliary guide (not shown)
Can be fixed along the feed guide 4 or independently, or other mechanism can be used for adjusting the feed guide 4 back and forth.

<Effects of the Invention> According to the present invention configured as described above, during polishing drive,
Since two or more putts slide back and forth in the opposite directions to the left and right at the same time, the vibrations generated by the return movements of the putts cancel each other out, and the vibration and noise of the processed material and the entire device are extremely reduced. Further, the stability of the apparatus is improved, the resistance to the feeding of the processed material is small, and even when a large power or a belt-shaped sandpaper is used, it is not necessary to use sandpaper having high tension, which is economical. In addition, since polishing is performed by a small lateral movement, precise polishing is possible. In particular, sandpaper is stretched in the width direction of the processed material, and it is put on a pad to match the processed surface consisting of concave and convex lines and is moved back in the direction of the concave and convex lines for polishing, so the sandpaper fits the entire processed surface. In addition to being able to grind even to the side of the processed material, by adjusting the feed amount of the processed material, it is possible to completely grind even the corners of the frame-shaped processed material, and by devising the pad shape the corners Accurate polishing is possible along the boundary line of the abutting surface of the processed material in.

[Brief description of drawings]

1 to 7 show one embodiment of the device of the present invention, FIG. 1 is an enlarged perspective view of a polishing portion of the device of the present invention, FIG. 2 is a plan view showing a polishing state of a processed material, and FIG. 5 is an overall front view, side view and plan view disclosing the inside of the polishing apparatus of the present invention. 6 and 7 are a front view and a side view of a main part showing the structure of the sander frame part, and FIGS. 8 and 9 are a front view and a side view of the main part showing the principle of a conventional polishing apparatus. 6: Table, 8: Processed material 8a: Processed surface, 26: Sandpaper 35: Feeding mechanism, 43: Putt

Claims (1)

[Claims] 1. A table (6) for mounting a processed material (8) having a processed surface (8a) having a concavo-convex line formed along the longitudinal direction and for intermittently feeding the material in a feeding direction along the longitudinal direction. , A belt-shaped sandpaper (26) stretched over the processed material (8) in the width direction of the processed material (8), and an end face of the processed surface (8).
a pad (43) made of an elastic material that forms an uneven surface conforming to the uneven line of a) and presses the sandpaper (26) along the processing surface. A mechanism for polishing the machined surface by reciprocating in the direction of the concave-convex stripes, and two or more corresponding pads (43) pressed against the same concave-convex stripes in the vicinity of the feed direction of the workpiece (8). The pad (43), (43), and the pad (43), (43)
And a sandpaper (26) which is reciprocally moved in the opposite direction at the same time along the concave-convex line, and a double-sided polishing apparatus.