JPS6116057Y2 - - Google Patents

Description

[Detailed explanation of the invention] <Industrial application field> This invention presses a flexible endless abrasive belt that freely travels around a drive mechanism against the curved surface of a rough-finished workpiece, thereby polishing the curved surface of the workpiece. In a curved surface sander for woodworking that performs abrasive finishing work, the pressing pad is constructed by stacking multiple thin plates, each thin plate is made to follow the curved surface of the workpiece differently, and the polishing belt is changed to the pressing pad. The present invention relates to a flexible pad device that can closely fit various curved shapes of workpieces without requiring a pad.

<Prior art> This type of flexible pad device was developed in U.S. Publication No. 57-51798.
No. 57-8064, British Patent No. 510,254 and German Patent No. 645,257.

By the way, in this type of pad device, even if tension is applied to the polishing belt, due to the curved shape of the workpiece, it does not necessarily come into close contact with the pressing surface of the pressing pad, causing uneven polishing.

To address this issue, we have proposed
In No. 74196, an air supply path is formed in the center of the pressing pad, and a discharge hole communicating with the air supply path is formed in the pressing surface, and air is blown from the discharge hole to move the abrasive belt to the workpiece side. It is designed so that it comes into pressure contact with the

By the way, this device presses the abrasive belt against the curved surface of the workpiece by discharging air, so when the pressing surface is pressed against the curved surface, the abrasive belt presses against the ridge of the curved surface of the workpiece. There is a point where the ridge is scraped off. In addition, the discharge holes must be formed by stacking and fixing the thin plates and then drilling the holes, which is troublesome, and if a large number of holes are drilled, each thin plate will be divided. , since it becomes impossible to hold them, the number of holes to be drilled is limited, and there are drawbacks such as not being able to secure a sufficient area for the air ports.

The object of the present invention is to provide a flexible pad device with a pressure pad that does not have the above-mentioned drawbacks.

<Means for solving the problem> The present invention has a pressing pad in which the side edge located on the polishing side is the pressing edge, and the through hole in the center communicates with the pressing edge. A communication groove is formed therein, and the opening position of the communication groove at the pressing edge differs in the width direction of the edge. Several kinds of thin plates,
It is constructed by stacking a plurality of sheets, and the pressing pad has an air supply path formed by overlapping the through holes, an air intake hole extending across a plurality of positions in the width direction by the plurality of communication grooves, and a plurality of pressing edges. furthermore, the pressing surface of the pressing pad is covered with a highly breathable covering material, the air supply path is depressurized, and the abrasive belt is pressed through the covering material by the front air intake hole. It is placed in close contact with the surface.

<Operation> When the pressing surface is pressed against the curved surface of the workpiece, each thin plate follows the curved surface, and the pressing surface is pressed against the curved surface of the workpiece. Further, a large number of air intake holes are formed in the pressing surface, and the polishing belt is brought into close contact with the pressing surface.

Further, the pressing pad is constructed simply by overlapping thin plates of a predetermined type in which opening positions at the pressing edges of the communicating grooves differ in the width direction of the edges.

<Embodiment> FIGS. 1 to 10 show an embodiment of the present invention, in which a lower frame 1 has a material feeding drive roll 2 driven by a motor 5 with a speed reducer.
and a material feeding driven roll 3 are provided, and an endless material feeding caterpillar belt 4 is wrapped around the rolls 2 and 3 to constitute a material feeding device.

In the press frame 6 located at the upper part of the lower frame 1, a material feeding press endless belt 8 is wrapped around rotatable driven large rolls 7, 7, and a plurality of belts are attached to the inner surface of the lower running part of the belt via an elastic body 9. Press small roll 1
0 is provided. The feeding material pressing device is attached to main pillar frames 11, 11 erected on the side of the upper surface of the lower frame 1 so as to be movable up and down in correspondence with the material feeding path 12 on the material feeding caterpillar belt 4.
The material feeding press device is raised and lowered along the raising and lowering screw 14 by the rotational operation. In addition, 15 is the screw 1
4 is a box cover, and 16 is a left-right moving handle for moving the main pillar frames 11, 11 left and right.

A polishing device 17 is arranged on the side surface of the feed material caterpillar belt 4 between the main pillar frames 11, 11.
As shown in FIG. 3, the polishing drive motor 18 connects a drive roll 19, a driven roll 20
and the driven tension roll 21 to the polishing frame 2
2, an endless polishing belt 23 is wound around each roll 19, 20, 21, and the rolls 20, 2
A pressable pad device 25 is disposed on the inner circumferential surface of the polishing belt 23 between the pads 1 and 2. The pad device 25 can be brought into contact with the pad portion. Here, 26 is a handle that manually swings the drive roll 19 to stabilize the running of the polishing belt 22, and 27 is a manual rotation handle for the drive roll 19.

The depressible pad device 25 will now be described in detail with reference to FIGS. 3-9.

A polishing frame 22 is provided on the side of the lower frame 1 so as to be movable vertically and horizontally, and on the polishing frame is a pad holder having two pairs of bearing metals 28 each having a shaft-fitting hole. A plate 24 is provided. Further, shafts 29 and 30 are loosely inserted into the bearing metal 28, respectively, and are connected to each other by a presser bar 31 that is stretched over the shafts 29 and 30.
32 is a fixing screw for the presser bar 31 via a nut 33. Furthermore, a cylinder 34 is mounted on the pad receiving plate 24, and a cylinder 36 with a relatively small capacity and short stroke is provided at the tip 35 of the piston rod. The piston rod 37 of the cylinder 36 is attached to the presser bar 31, and the shafts 29, 30 are moved by the operation of the cylinder. In addition, 38 is the rear end of the piston rod of the cylinder 34, and 39 is the rear end of the piston rod of the cylinder 34.
is a stroke adjuster attached to the rear end of the rod so that its position can be adjusted freely.

Further, a pad receiving frame 40 is fixed to the tips of the shafts 29, 30 on the workpiece side, and a pad receiving member 43 is supported by the frame.

The supporting means will be explained with reference to FIG. 6. The pad receiving frame 40 has a shaft 45 with its lower end fitted through holes 48 provided on the left and right sides of the flail 40.
48, and attach the nut 4 to the protruding end of the threaded portion.
5', and the shaft fitting holes 41 and 42 at both ends of the flange of the pad receiver 43 are slidably fitted onto the shaft 45 via a spring 47. . Furthermore, a pressure receiving seat 44 is irremovably fitted onto the tip of the shaft 45 that protrudes upward from the shaft fitting through holes 41 and 42 with a nut, and the pressure receiving seat 44 and the upper surface of the flange of the pad receiver 43 An elastic body such as a spring 46 is interposed between them. Therefore, the pad receiver 43 has springs 46 and 47.
It is supported by the pad receiving frame 40 while being allowed to move up and down in a cushioning manner.

The pad receiver 43 is provided with a recess 66,
A housing 54 accommodating a pressing pad a, which is a main part of the present invention, is placed in the recess 66 in a tight fit and fixed with a thumb screw 68.

The configuration of the pressure pad a will be described in detail below.

The pressing pad a is constructed by stacking a plurality of thin plates 51 shown in FIG. 10.

Here, the thin plate 51 has a substantially rectangular shape with one side end shaped like a table and a protruding edge thereof as a pressing edge 80, and has an oval-shaped through hole 49 in the center thereof. and the pressing edge 80 through the communication grooves 50, 61,
62 communicates with each other.

The thin plate 51 has a communication groove 50 which is inclined to the right in the figure and whose opening position is located to the right of the pressing edge 80, and a communication groove whose opening is located at the center of the pressing edge 80. 61 and one having a communication groove 62 which is inclined leftward in the figure and whose opening is positioned to the left of the pressing edge 80.

The thin plates 51 are made by stacking the three types of thin plates alternately and sequentially, thereby forming a communication path b formed by overlapping the through holes 49 and the communication groove 6.
2 constitutes a pressing pad a having an air intake hole c formed therein and a pressing surface d formed by stacking the pressing edges 80. Since the intake holes c are opened at three different positions by the communication grooves 50, 61, and 62, suction is uniform across the width. Moreover, the thin plate 51 can be prepared in a wide variety of types, each having a different opening position of the communicating groove.

The pressure pad a is built into a housing 54 in the form of a sander arch with an upper cover 52 and a lower cover 53, and has a suction hole 55, a suction chamber 56, and a stop flange 5 in a communication passage b.
7 is inserted, and the first nut 5
9 (for tightening thin plates) and a second nut 60 (for preventing loosening) are screwed together to hold a large number of thin plates 51.

The pressing surface d of the pressing pad a is made of a flexible backing material 64 such as felt, cloth, or sponge with good air permeability.
(covering material) is applied to make the pressing surface smooth. Further, its surface is covered with a covering band 65 (covering material) made of cloth or the like having good air permeability and wear resistance, and the outer surface of the covering band 65 is used as a pad surface 71.
Each of the covering materials may be provided with a plurality of holes to provide ventilation.

The casing 54 provided with each of the above configurations is fitted into the recess 66 of the pad holder 43 and fixed to the pad holder 43 with a thumbscrew 68 via an L-shaped clamping plate 67.

Further, 69 is a workpiece guide, and 70 is its moving handle.

The operation of the above embodiment will be explained.

First, rotate the moving handle 70, adjust the workpiece guide 69, loosen the second nut 60 for locking, and then tighten the first nut 59 for tightening the thin plate.
is loosened to bring the thin plate 51 into an extruded state. next,
The pressing pad a is pushed out toward the polishing side by driving the cylinders 34 and 36, and the pad surface 71 on the surface of the coating band 65 is
is pressed against the curved surface of the workpiece 63 via the endless polishing belt 23, and each thin plate 51 constituting the pressing pad a is
The pressing edges 80 of the pads follow the curved surfaces, the pressing surface d of the pressing pad a conforms to the curved shape, and the pad surface 71 comes into close contact with the curved surface. After completing the copying adjustment, tighten the first nut 59 and the second nut 60,
The thin plate 51 is prevented from shifting, and the covering band 65 is fixed with bolts 72.

After that, the suction chamber 56 and suction hole 55 of the tightening shaft 58
The pressure in the communication path b of the pressure pad a is reduced through the pressure pad, and a suction effect is generated from the intake hole c. Due to this suction, the pad 64 and the covering band 65 are maintained in close contact with the pressing surface of the pressing pad a even after the contact with the workpiece 63 is released.

Next, the processed material 63 is removed once, and the cylinder 34 is
After contracting the pressing pad a and retracting the pressing pad a, the endless polishing belt 23 is stretched around each roll 19, 20, and 21 in a tensioned manner, and then the polishing drive motor 18 is driven to cause the endless polishing belt 23 to run. , the cylinder 34 is driven to extend to bring the pad surface 71 into contact with the inner peripheral surface of the endless polishing belt 23. As a result, the endless polishing belt 23 is
runs closely following the pad surface 71. At this time, since a large number of the suction holes c are provided across the width direction of the pad surface 71, the suction is applied evenly, and the endless polishing belt 23 is securely brought into close contact with the pad surface 71.

Further, the lifting handle 13 is rotated to raise and lower the driven material pressing device to adjust the gap in the material feeding path 12, and the motor 5 is driven to drive the caterpillar belt 4.
By traveling and supplying the workpiece 63, the pad surface 71 comes into close contact with the curved surface of the workpiece through the endless polishing belt 23, and the final polishing process is performed on the curved surface.

In the embodiment described above, the padding material 64 and the covering band 65 may be removably attached using an adhesive or the like after the press pad a is matched. Further, although the pressable pad device 25 is pushed out by the cylinder 34, it may be pushed out manually.

<Effects of the invention> As described above, the present invention has different communication grooves 5.
Several types of thin plates 5 classified by 0, 61, 62
1 are stacked one on top of the other to form a pressure pad a having a communication path b and an intake hole c, thereby reducing the pressure in the communication path b and applying suction through the intake hole c to cover the cover material 64 and the covering band 65. Since the endless polishing belt 23 is adsorbed to the pad surface 71 through the pad surface 71, (a) the endless polishing belt 23 can be brought into close contact with the pad surface 71, and the polishing can be performed evenly.

(b) The pressing pad a can be constructed only by overlapping the thin plates 51, and the air intake holes c are not formed by post-processing, so assembly is easy.

(c) By simply increasing the number of thin plates 51, the pressing surface d of the required width can be easily constructed.

D. By preparing several types of thin plates 51, suction holes c can be formed at various locations in the width direction of the pressing surface d, and uniform suction can be achieved.

(e) Since one suction hole c can be formed for each thin plate 51, the area of the suction hole becomes large and the suction efficiency becomes good.

It has excellent effects such as

[Brief explanation of the drawing]

The attached drawings show an embodiment of the present invention, and FIG. 1 is a front view of a curved surface sander for woodworking, FIG. 2 is a side view of the same, FIG. 3 is a plan view of the same, and FIG. A plan view, FIG. 5 is a front view with the same part omitted, FIG. 6 is a sectional view taken along the line A-A in FIG. 9 is a sectional view taken along line B--B in FIG. 8, and FIG. 10 is an enlarged front view of the thin plate 51. 4... Caterpillar belt, 8... Material feeding press endless belt, 12... Material feeding path, 23... Endless polishing belt, 25... Pressable pad device, 49... Through hole, 50... Communication groove, 51... ... Thin plate, 55 ... Suction hole, 64 ... Covering material (covering material), 65 ... Covering band (covering material), 71 ... Pad surface, 80 ... Pressing edge, a ... Pressing pad, b... ...Communication path, c...
Intake hole, d...pressing surface.

Claims (1)

[Scope of Claim for Utility Model Registration] A curved surface sander for woodworking in which a pressing pad is installed in an endless abrasive belt that is stretched around a drive mechanism, and the pad presses the endless abrasive belt against the curved surface of a workpiece to finish the curved surface of the workpiece. In the press pad, the side edge located on the polishing side is the pressing edge, and the central portion is transparent and a communication groove is formed to communicate the through hole and the pressing edge. In addition, several types of thin plates are classified by the opening position at the pressing edge of the communication groove being different in the width direction of the edge,
It is constructed by stacking a plurality of sheets, and the pressing pad has an air supply path formed by overlapping the through holes, an air intake hole extending across a plurality of positions in the width direction by the plurality of communication grooves, and a plurality of pressing edges. furthermore, the pressing surface of the pressing pad is covered with a highly breathable covering material, and the air supply path is depressurized and the abrasive belt is applied to the pressing surface through the covering material through the intake hole. A flexible pad device for a curved surface sander for woodworking, which is characterized by closely spaced pads.