JPS6218361Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a workpiece pressing device that uses air pressure to press the workpiece fed into the polishing device in a sander machine used for polishing wood, resin, etc. It is something.

(Prior art) A polishing device consisting of a sanding belt hung on a drive guide mechanism or a sanding paper cloth wound around a polishing drum is provided corresponding to the workpiece conveying surface, and the front and rear sides of the polishing device are A treading device equipped with a treading member having a treading surface against a workpiece on the lower surface of its tip is described in Japanese Utility Model Publication No. 32713/1983.

(Problems to be solved by the invention) As described above, in the mechanism in which the workpiece is directly pressed toward the material feeding surface by the pressing surface on the bottom surface of the tip of the pressing member, the weight of the pressing member is Even if the surface of the material is scratched and polished with a polishing device, the scratched marks cannot be completely removed, so scars may remain, resulting in an unsightly finish depending on the properties of the processed material. However, if the tread pressure just before sending the material to the polishing device is inadequate, or if it is not treaded properly, the workpiece will spring up as shown by the arrow Z in Figure 3, resulting in poor polishing of the front edge in the material feeding direction. ,
We cannot miss that pressure. Therefore, there is an urgent need to develop a pressure device that does not leave any scars.

(Means for Solving the Problems) The present invention enables treading without leaving any scars as described above, and does not allow the treading surface of the treading member to come into direct contact with the workpiece. Air is ejected from the surface, and the air pressure presses the workpiece against the feed surface and sends it to the polishing device without causing the above-mentioned splashing. At the same time, the treading member is slightly lifted from the workpiece, causing scratches. This is to ensure that it does not go away.

(Example) Embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a partially cutaway side view of the main parts of a belt sander equipped with the device of the present invention, in which an endless sanding belt 2 is freely runnable around a sanding roll 1 and a tension roll (not shown). A polishing device 3 is configured. The sanding roll 1 can adjust the amount of polishing by changing the axial center position by rotating the eccentric shaft 1a.

A treading member 5 is attached to the front and rear sides of the polishing device 3 in the material feeding direction by a shaft 4 extending across the frame.
The polishing device 3 is swingably supported, and a treading surface 7 formed on the lower surface of the tip portion 6 corresponding to the workpiece a is arranged symmetrically so as to face from the front and back of the polishing device 3. A pressurized air supply port 8 is provided on the upper surface of the tip 6 of the treading member 5, and a pressurized air supply pipe 9 is connected from the outside, and an air distribution passage 1 formed in the width direction is provided.
Conducts to 0. From the air distribution passage 10 are a number of air jetting passages 1 which are inclined toward the material feeding direction.
1 is branched at equal intervals in the width direction and communicates with a large number of air outlets 12 opened in the tread surface 7. At the tip 6 of the treading member 5 disposed on the front side in the material feeding direction of the polishing device 3, there are a number of air jetting passages 13 that are inclined further diagonally upward from the air distribution passage 10.
are branched at equal intervals in the width direction and communicated with an air outlet 14 opened in the cutting slope 6a of the tip 6. Reference numeral 15 denotes a suction duct for dust generated by the polishing of the polishing device 3, and its suction duct 16 is brought close to the sanding belt 2, and the air jet nozzle 1
Place it directly above No. 4.

17 acts on the inner upper surface of the shaft 4 that supports the treading member 5, swings the tip 6 downward, and forms the treading surface 8.
The subring 18 is an adjustment screw fixed to the horizontal frame 20 so that the degree of downward protrusion can be adjusted by a lock nut 19. Regulates the amount of downward swing. Reference numeral 21 denotes a pressure roll arranged symmetrically before and after the polishing device 3, 22 a small pressure roll, 23 a material conveying belt disposed below the polishing device 3, and 24 a material conveying frame.

The tread pressure portion 5 can also be used by being divided into a plurality of pieces in the width direction. In this case, pressurized air supply pipe 9
Piping exceptionally. Furthermore, the device of the present invention includes a belt sander that uses a pressing pad instead of the sanding roll 1, a sanding machine that attaches a sanding belt to a contact roll placed below, and a sanding machine that wraps a sanding paper cloth around one contact roll. It can also be applied to sanding machines.

The embodiment of the present invention is as described above, and when the workpiece a is fed in the direction of the arrow X in FIG. A large number of air outlets 12 reach the treading surface 7 and open at the treading surface 7.
A layer of pressurized air is formed between the treading surface 7 and the treaded surface of the upper surface of the workpiece a by the ejection of pressurized air from the treading member 5, which causes the treading member 5 to swing upward about the shaft 4. As a result, the treading surface 7 is lifted from the workpiece a and counteracts its own weight and the elasticity of the spring 17. The workpiece a is pressed against the feed belt 23 by the pressurized air and reaches the sanding device 3, where the sanding belt 2 runs in the direction of the arrow y in FIG.
Polished by The dust generated at this time and attached to the sanding surface of the sanding belt 2 is blown away by pressurized air ejected from a large number of pressurized air outlets 14 opened in the sanding slope 6a of the treading member 5, and is blown away into the suction duct. 15 suction ports 16
It is sucked in and discharged to the outside of the aircraft. The leading end of the polished workpiece a escapes from the polishing device 3 and reaches the treading surface 7 of the treading member 5 disposed on the rear side in the material feeding direction, where a large number of air outlets open on the treading surface 7. By ejecting pressurized air from 12 to the workpiece a, the treading surface 7 of the treading member 5 undergoes the same treading effect as described above and swings upward about the shaft 5, causing the treading surface 7 of the treading member 5 to swing upward from the pressed surface of the workpiece a. It floats up. The workpiece a pressed against the material conveying belt 23 is successively treaded by the small tread roll 22 and the tread roll 21 and sent out of the machine to complete the polishing.

(Operations and Effects of the Invention) The operation of the workpiece pressing device of the present invention is as described in the above embodiment, and the processing of the pressing members 5 arranged symmetrically on the front and rear sides of the polishing device 3 in the material feeding direction. A treading surface 7 is formed on the lower surface of the tip 6 corresponding to the material a, and an air jetting passage 11 that opens an air jetting port 12 is provided on the treading surface 7, and is supplied to the polishing device 3 by a material feeding device. For processed materials,
At the same time, the pressurized air is sprayed to reliably apply pressure to the material feeding surface, and at the same time, the pressure member itself is slightly compressed by the pressure air layer formed between the pressed surface and the pressed surface of the workpiece by the spraying of the pressurized air. Because it floats,
It is possible to completely prevent the risk of scratching and scratching the surface of the workpiece, resulting in an unsightly finish with scars remaining even after polishing with the polishing device, which is the case with conventional devices in which the pressing member directly contacts the workpiece and applies pressure. can. In addition, since pressurized air is blown to apply tread force to the workpiece, it can be applied not only to soft or hard workpieces, but also to thin workpieces such as plywood.

[Brief explanation of the drawing]

The attached drawings show the shaft 4 of the present invention, Fig. 1 is a partially cutaway side view of the main part, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 shows the springing up of the workpiece a. FIG. DESCRIPTION OF SYMBOLS 1... Sanding roll, 2... Endless sanding belt, 3... Polishing device, 5... Treading member, 6... Tip, 7... Treading surface, 11... Air jetting passage, 12... Air Tomb exit.

Claims (1)

[Scope of Claim for Utility Model Registration] A sanding device consisting of a sanding belt hung on a drive guide mechanism or a sanding paper cloth wound around a polishing drum is provided in correspondence with the surface of the work material being transported, and the material is transported by the sanding device. In a sander equipped with treading members on the front and rear sides of the direction, the bottom surface of the tip is a treading surface corresponding to the material to be processed, the blowing air is blown onto the material to be processed and the material is treaded on the feeding surface at the same time. A work material treading device for a sander machine, characterized in that a treading member is provided with an air jet passage having an air jet port opened in the treading surface to slightly lift the treading surface from the workpiece by the air pressure.