JPS62842Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a treading pad device for a belt sander machine that grinds and polishes the surface of wood. Specifically, a sanding belt is wrapped around a group of rolls, and a treading pad device is installed inside the sanding belt on the material feeding side of the belt. The present invention relates to a tread pressure pad device that enables the selection of various grinding modes in a belt sander machine which is equipped with a grinding device formed by a material feeding path and facing the material feeding device.

Referring to FIG. 1, the structure of an example of this type of belt sander will be described.

A vertical frame 2 is erected at the rear of the lower frame 1, and a material feeding frame 5 is supported at the front of the lower frame 1 by lifting screws 3, 3 which are rotated in conjunction with a handle 4. The material feeding frame 5 supports a driving roller 6 and a driven roller 7.
A material feeding device consisting of a material feeding belt 8 wrapped around a material feeding belt 7 is provided so as to be movable up and down by rotation of the handle 4.

A sanding frame 10 is provided on the vertical frame 2 with a material feeding path placed on the material feeding device,
A tension roller 11 which also serves as a steering wheel is provided on the upper part of the sanding frame 10 so as to be movable up and down. Furthermore, the sanding frame 10
A driving roller 12 is pivotally supported on the supply side and a driven roller 13 is pivotally supported on the discharge side, and a pressure pad device P is provided between the driving roller 12 and the driven roller 13, and the tension roller 11 and the driving roller 12 and the driven roller 13, and when the workpiece X comes directly below by the tread pressure pad device P, the sanding belt 14 is pressed against the workpiece X supplied to the material feeding path T. That's how it happens.

By the way, when using such a belt sander to polish a painted surface of a workpiece, for example, if the amount of polishing per time is too large, the paint will also be removed, exposing the surface, resulting in a defective product. will occur. In this way, the amount of polishing needs to be an appropriate amount corresponding to the material to be polished. The amount of polishing is determined by the pressing force of the tread pad and the width of the tread pad in the material feeding direction - that is, the length at which one point on the top surface of the workpiece X is pressed against the sanding belt 14 by one grinding ( Continuous grinding (polishing distance).

2 and 3 show the structure of a conventional tread pad device P, in which the drive roller 1 of the sanding frame 10 is
2. A treading frame 20 is installed between the driven rollers 13 so as to be freely removable in the width direction, and a mounting groove 21 formed in the treading frame 20 and open to the material feeding path T side is filled with air. A bag 22 is attached. On the lower surface of the air bag 22, there is a pressure regulating material S formed by sandwiching a plurality of pins 24 arranged in parallel on the left and right sides in the transfer direction between flexible plate members 23, 23 made of leaf springs, rubber plates, etc.; Pressure pads 25 made of sponge, rubber, felt, etc. are sequentially arranged, and furthermore, the lower part of the pressure pad 25 projects downward from the opening 21a of the mounting groove 21, and its lower surface is covered with a slippery and wear-resistant material such as cloth. covered by a covering material 26;
When the workpiece X comes directly under the tread pad 25, the internal pressure of the air bag 22 increases, and the lower surface of the tread pad 25 is pushed downward, causing the sanding belt 1
4 to the upper surface of the workpiece X.

When light polishing and heavy polishing are used together in the conventional tread pad device P described above, in the case of heavy polishing, the tread pad 25 is inserted into the opening 2 as shown in FIG.
1a is made as wide as the full width of the front and back to increase the continuous grinding and polishing distance, and in the case of light polishing, as shown in FIG.
5 is arranged to shorten the continuous grinding and polishing distance. By the way, in this light polishing, since the width of the tread pad 25 is shorter than the width of the opening 21a, the tread pad 25 is not clamped by the regulating portions on the front and rear surfaces of the opening 21a.
In order to prevent the tread pad 25 from falling down, it is necessary to glue it to the lower surface of the pressure regulating material S and integrate it with the pressure regulating material S, which is extremely troublesome to change. They have drawbacks such as being unable to obtain sufficient treading force due to bending or bending.

The present invention aims to eliminate the drawbacks of the conventional device, and has a plurality of mounting grooves with openings on the material feeding path side arranged in a row in a treading frame adjacent to each other in the material feeding direction, and internal pressure is applied to each mounting groove separately. In this configuration, an air bag controlled by the air bag is attached to each air bag, and a pressure pad is arranged on the bottom surface of the air bag through a pressure regulating material, and the bottom surface of the pressure pad in each mounting groove is covered with a flexible coating material. By selectively increasing the pressure of the air bags attached to each of the mounting grooves, the width of the pressure applied to the workpiece by the pressure pad is made variable.

A first embodiment of the present invention will be described with reference to FIGS. 4 and 5.

A treading frame 30 is fitted in the lower part of the sanding frame 10 between the driving roller 12 and the driven roller 13 so as to be freely removable in the left and right direction, and the treadling frame 30 is open to the material feeding path T side. A mounting groove 31a and a mounting groove 31b having the same width are arranged adjacently in parallel along the material feeding direction, and the mounting grooves 31a and 31b are
Air bags 33a and 33b are fitted into the holes, respectively. As shown in FIG. 6, air is supplied to the air bags 33a and 33b from respective supply ports 38, and the internal pressures thereof are controlled separately. On the lower surface of the air bags 33a, 33b, there is a pressure regulation material S, which is made by sandwiching a plurality of pins 35 arranged in parallel on the left and right sides in the transfer direction between flexible plates 34, 34 made of plate springs, rubber plates, etc. Place the
A locking protrusion 32 that projects inward on the front and rear inner walls of the opening 32
a, 32b, and on the lower surface there are tread pads 36a, made of sponge, rubber, felt, etc.
36b. The tread pressure pads 36a, 36
The lower part of b protrudes downward from the opening 32 of the mounting groove 31a, 31b, and its lower surface is covered with a slippery wear-resistant covering material 37 such as cloth, and the lower part of the mounting groove 31a, 31b is
The wear-resistant covering material 37 is attached to the mounting grooves 31a and 31b by screwing a bolt 38 to the lower surface of the tread pressure frame 30 between the grooves 31a and 31b.
Tense contact with the lower surface. This constitutes a pressure pad device P that contacts the inner surface of the sanding belt 14 and presses the material feeding path T side.

The operation of this embodiment will be explained.

As shown in FIG. 1, the workpiece X is inserted from the supply side into the material feeding path T, and is fed below the grinding device by the material feeding device. When the tip of the workpiece X comes directly under the pressure pad device P, a limit switch (not shown) that detects the supply of the workpiece Due to digestion, air bladder 33
Air is selectively supplied to a and 33b from the supply port 38 in FIG. 6, causing the pressure pads 36a and 36b to descend, thereby pressing the sanding belt 14 against the upper surface of the workpiece X.

If heavy grinding is to be performed on workpiece X, the fourth
As shown in the figure, air is supplied to both the air bags 33a and 33b, and the width of the pressure applied to the upper surface of the workpiece X is the sum of the widths of the lower surfaces of the pressure pads 36a and 36b.

Furthermore, in order to perform light grinding on the workpiece X, air is supplied to either of the tread pads 36a, 36b as shown in FIG. For this reason, the tread pressure pad 36
Only the lower surface of either a or 36b presses the sanding belt 14 against the workpiece X, and the continuous grinding and polishing distance to the workpiece X becomes shorter.

In FIG. 7, mounting grooves 41a and 41b having different front and rear widths are provided in the tread pressure frame 30, and the wide mounting groove 41a is provided with a pressure regulating material S mentioned above on the lower surface of the air bag 43a. A tread pressure pad 46a is arranged, and a narrow tread pressure pad 46b is arranged on the lower surface of the air bag 43b in the narrow mounting groove 41b,
The lower surfaces of the tread pressure pads 46a, 46b are covered with a wear-resistant covering material 47. The wear-resistant covering material 47 may be fixed to the lower surface of the treading frame 30 between the mounting grooves 41a and 41b with bolts as in the first embodiment.

In this embodiment, when the material
There is an advantage that three types of polishing operations can be performed: medium polishing in which air is supplied only to the air bag 43b, and light polishing in which air is supplied only to the narrow air bladder 43b.

FIG. 8 shows a third embodiment, in which the tread pressure frame 30
There are mounting grooves 51a, 5 with three types of front and rear widths: large, small, and medium.
1b and 51c, air bags 53a, 53b, and 53c are attached to each of them, and a mounting groove 51a is attached to the lower surface of each via the above-mentioned pressure regulating material S.
A wide tread pressure pad 56a is installed in the mounting groove 51b, a small tread pressure pad 56b is installed in the mounting groove 51b, and a mounting groove 51c is installed.
Medium-width tread pads 56c are arranged respectively in the tread pads 56a, 56b, and 56c, and the lower surfaces of the tread pads 56a, 56b, and 56c are covered with a wear-resistant covering material 57, and bolts 58 are screwed between them to the lower surface of the tread frame 30 to create a tensioned state. come into contact with.

In this embodiment, tread pads 56a, 5 of three widths are used.
Air bags 53a, 5 with 6b, 56c arranged below
By selectively supplying air to 3b and 53c and using the respective tread pads 56a, 56b, and 56c alone or in appropriate combinations, it is possible to generate various tread pressure widths on the upper surface of the workpiece X. This has the advantage of being able to be polished.

Although the belt sander of each of the embodiments described above has the material feeding device and the grinding device arranged vertically in correspondence with each other, the present invention can also be applied to a device in which the material feeding device and the grinding device are arranged horizontally.

As clarified in the above description, the present invention provides a plurality of mounting grooves (31a, 31b, etc.) which are open on the material feeding path side in the tread pressure frame 30 and are arranged in parallel adjacent to each other in the material feeding direction. Air bags (33a, 33b, etc.) whose internal pressures are controlled separately are attached to the air bags, and tread pads (36a, 36b, etc.) are arranged on the bottom surface of the air bags via a pressure regulating material S. Since air is selectively supplied to the air bags alone or in appropriate combinations to change the width of the pressure applied by the sanding belt 14 to the workpiece X, not only the pressing force of the tread pad but also the width of the workpiece The length that one point on the top surface is pressed against the bottom surface of the belt sander by one grinding process, that is, the continuous grinding and polishing distance, can be varied only by air control. There are excellent effects such as being able to easily obtain the amount of grinding and polishing at will.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing an example of a belt sander, Figs. 2 and 3 are vertical side views showing a conventional tread pad device P, and Figs. 4 and 5 are tread pad devices according to the first embodiment of the present invention. 6 is a sectional view taken along the line A-A in FIG.
The figure is a longitudinal sectional side view showing a tread pressure pad device P according to a third embodiment of the present invention. 14; Sanding belt, 31a, 31b,
41a, 41b, 51a, 51b, 51c; mounting groove, 33a, 33b, 43a, 43b, 53a,
53b, 53c; Air bag, 36a, 36b, 46
a, 46b, 56a, 56b, 56c; tread pressure pad 17X; processed material; S; pressure regulating material.

Claims (1)

[Scope of utility model registration request] In a belt sander machine, a sanding belt is stretched around a group of rolls, and a grinding device comprising a tread pad device installed inside the sanding belt on the material feeding side of the belt is installed opposite to the material feeding device with a material feeding path. A plurality of mounting grooves with the material feeding path side open are arranged in a row adjacent to each other in the material feeding direction, and each mounting groove is equipped with an air bag whose internal pressure is controlled differently to suit various grinding conditions. The tread pressure of the belt sander machine is further characterized in that a tread pressure pad is arranged on the lower surface of the air bag via a pressure regulating material, and the lower surface of the tread pressure pad in each mounting groove is covered with a flexible covering material. padded device.