JPH0536617Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention is for grinding and polishing the surface of metal materials, wood, etc., and is a method of grinding and polishing the surface of metal materials or wood. A polishing head comprising a tread pressure device with a tread plate attached to the inner surface of the abrasive belt facing the polishing belt is installed opposite to the material feeding path so that the polishing belt runs in a direction intersecting the material feeding path. This article relates to a treading device for a belt sander machine.

<Prior art> In this type of belt sander, a treading device is disposed on the inner surface of the abrasive belt facing the running material passage, and the abrasive belt running on the lower surface of the tread plate of the treading device is used to control the workpiece. Grinding and polishing is performed by pressing the material against the material.

<Problems to be solved by the invention> By the way, in the conventional tread pressure device, the tread plate is of a fixed type, as disclosed in Japanese Patent Publication No. 56-21543, etc. If the thickness of the processed material exceeds a specified value or the machined surface is irregular, excessive pressure will be applied to the tread plate, causing accelerated wear of the tread plate, or in some cases, the processed material may There were negative effects such as the lower part becoming unable to run and mechanical stress strain being applied to each frame.

The object of the present invention is to provide a treading device for a belt sander which does not have the drawbacks of the conventional belt sander.

<Means for solving the problem> The present invention is arranged on the running material path at a predetermined interval in the horizontal direction, and on the opposing inner surface thereof, inclined support surfaces that are inclined in the direction of expanding upward are formed. a pair of locking portions, a mounting plate portion that holds a tread plate on its lower surface and has inclined side surfaces formed on both sides to be evenly mounted on the inclined support surface; and a rod is connected to the upper surface of the mounting plate portion. The device is characterized in that it includes a vertical holding cylinder that normally holds the inclined side surface of the mounting plate portion in pressure contact with the inclined support surface of the locking portion.

<Function> In a normal state, the inclined side surface of the mounting plate portion is held in pressure contact with the inclined support surface of the locking portion by the holding cylinder, and the lower surface of the tread plate serves as a polishing reference surface. Since this holding cylinder is under high pressure, when the workpiece is within a predetermined thickness range, the tread plate presses the workpiece while keeping the mounting plate supported by the locking part, thereby processing the workpiece. The upper surface of the material is ground and polished by an abrasive belt to a predetermined thickness.

By the way, if the workpiece is so thick that it resists the pressure of the holding cylinder, or if there are protrusions in some parts, excessive pressure will be applied to the bottom surface of the tread plate, and it will resist the pressure of the holding cylinder. , the mounting plate portion floats up and is released from the locking portion, thereby allowing natural grinding and polishing to be performed.

When the excess pressure is released, the mounting plate part is lowered by the holding cylinder, and its both inclined side surfaces are evenly placed on the inclined support surfaces of the locking part. At this time, due to the guiding action caused by the surface contact between the inclined side surface and the inclined support surface, the width and height positions of the tread plate are set at predetermined positions, and accurate positioning is always achieved, and the bottom surface of the tread plate is again polished to the standard. This will define the product thickness of the processed material.

<Example> An example of a belt sander according to the present invention will be described with reference to FIGS. 1 and 2.

A material feeding frame 2 is attached to one side of the base frame 1.
is carried on board, and inside the material transport frame 2,
A material feeding device is provided in which a material feeding belt 5 is stretched around a drive roll 3 and a driven roll 4 which are pivotally supported in the front and back, and the upper surface thereof serves as a material feeding path. The material feeding belt 5
uses a sanding belt to prevent slipping between the workpiece and the workpiece w.

Further, on the material feeding frame 2, support guides 6a,
6b are arranged at intervals equal to the width of the workpiece w.

Further, on the other side of the base frame 1 is a vertical frame 7.
is erected, and two polishing heads 8a and 8b, front and rear, are attached to the vertical frame 7.

The polishing heads 8a and 8b are fitted into vertical lifting guides 9 formed on the inner surface of the vertical frame 7, and can be moved up and down by a lifting handle 10. 12, driving roll 13 and driven roll 14
tension rolls 1
Each roll 1 is arranged in a triangular shape with roll 2 at the top position.
The abrasive belt 15 is stretched across the rollers 2 to 14, and the driving force of the grinding motor 16 is transmitted to the drive roll 13, thereby causing the abrasive belt 15 to run clockwise in FIG. 1 intersecting the material feeding path. .

A treading device 17 according to the present invention is disposed between the rolls 13 and 14 and is inscribed in the abrasive belt 15. The configuration of this pedal pressure device 17 will be explained in detail with reference to FIGS. 3 and 4.

18 is a pad frame fixed to the vertical frame 7, and a pair of locking parts 2 having an L-shaped cross section are provided at both lower ends of a mounting back plate 19 fixed to the vertical frame 7.
0 and 20 are provided at a predetermined interval, and inclined support surfaces 21 and 21 that expand upward are provided on the opposing inner surfaces.

On the pad frame 18, a holding cylinder 23 made of an air cylinder is also arranged vertically with respect to the vertical frame 7, and a mounting plate part 25 is fixed to the rod 24. The mounting plate portion 25 is disposed within the interval between the inclined support surfaces 21, 21, and has inclined side surfaces 26, which have the same slope as the inclined support surfaces 21, 21, on both sides thereof.
26 is formed. These inclined side surfaces 26, 26,
The mounting plate portion 25 is stably supported by being held in pressure contact with the inclined support surfaces 21, 21 by the pressing force of the holding cylinder 23.

The holding cylinder 23 also has an air source 2.
8 are connected by a conduit 29. Said pipe line 2
9 is provided with an air regulator 31 equipped with a pressure gauge 30 and a switching valve 32, respectively. Air at a predetermined pressure is supplied from the air source 28 into the holding cylinder 23, and the holding cylinder 2
When the internal pressure of 3 exceeds a predetermined pressure, the switching valve 32
The structure is such that air escapes to the outside.

A horizontal mounting surface 27 is provided on the lower surface of the mounting plate portion 25.
A tread plate 33 such as a metal plate or a rubber plate is brought into contact with the horizontal mounting surface 27. A sharp protrusion 34 is formed at the upper right end of the tread plate 33 in FIG. 4, and is evenly fitted into and supported by a fixed locking piece 35 formed on the right side surface of the horizontal mounting surface 27. Further, an inclined side surface 34 is formed on the left side surface of the tread plate 33 in FIG.

The operation of the above embodiment will be explained. Processed material lol
When the material is sent to the material feeding device and reaches the lower part of the tread pressure plate 33, since the pressing force of the holding cylinder 23 is usually large, the mounting plate portion 25 is moved to the inclined support surfaces 21, 2.
1, the lower surface of the tread plate 33 becomes a polishing reference surface, and the polishing belt 15 running on the lower surface grinds and polishes the upper surface of the workpiece w to a predetermined thickness.

However, if the thickness of the supplied workpiece w is larger than the predetermined thickness and excessive grinding is required, or if the upper surface of the workpiece w is an irregular surface with protrusions, the tread plate may be damaged as a reaction to the grinding and polishing. Excess pressure p is generated on the lower surface of 33, resisting the internal pressure of the holding cylinder 23,
The mounting plate portion 25 floats slightly as shown in FIG. Air is discharged from the switching valve 32 in response to a change in the volume of the holding cylinder 23 due to this floating.

When the excess pressure is released, the holding cylinder 2
Air at a predetermined pressure is again supplied from the air source 28 into the interior of the mounting plate 25, and the mounting plate portion 25 is lowered, and the inclined support surface 2
1 and 21. This locked state is always returned to the predetermined position in the width and height positions by the guiding action of the inclined support surfaces 21, 21 and the inclined side surfaces 26, 26, and the lower surface of the tread plate 33 is brought back to the polishing reference surface. becomes. For this reason, when the workpiece w is supplied from a direction intersecting the running direction of the mounting plate section 25, the tread plate 33 always comes into contact with the same width position via the mounting plate section 25, causing variations in the grinding and polishing conditions. This allows for stable processing, and unless the thickness is abnormal as described above, the product thickness will be a predetermined thickness.

Therefore, the workpiece w is polished by the polishing heads 8a and 8b,
Polishing belt 15 under the tread plate 33 of the tread pressure device 17
This allows the upper surface to be well ground and polished.

<Effects of the invention> As described above, the invention has the advantage that the holding cylinder 2
Both sides of the mounting plate part 25 that supports the tread plate 33 provided at the lower end of 3 are supported by the inclined support surfaces 21, 21, so that when excessive pressure is applied to the lower surface of the tread plate 33 during the grinding and polishing process. Since the mounting plate portion 25 can be floated, grinding and polishing can be carried out with ease. Further, when returning to the steady state, the tread plate 33 is brought to a predetermined position with its lower surface always constant due to the guiding action caused by the surface contact between the inclined support surfaces 21, 21 and the inclined side surfaces 26, 26. . Therefore, there are excellent effects such as being able to perform good grinding and polishing of the workpiece w.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the present invention, in which Fig. 1 is a front view of the belt sander, Fig. 2 is a side view of the same, Fig. 3 is a front view showing the lower part of the polishing heads 8a and 8b, and Fig. 4 is a front view of the belt sander. FIG. 2... Material feeding frame, 5... Material feeding belt, 8
a, 8b... polishing head, 15... polishing belt,
17... tread pressure device, 20, 20... locking part, 2
DESCRIPTION OF SYMBOLS 1, 21... Inclined support surface, 23... Holding cylinder, 25... Mounting plate part, 26, 26... Inclined side surface, 33... Pressure plate.

Claims (1)

[Scope of Claim for Utility Model Registration] A polishing head comprising a polishing belt stretched around a plurality of rolls, and a pressure device equipped with a pressure plate mounted on the inner surface of the polishing belt facing the running material path, In a belt sander installed opposite to the material feeding path so that the abrasive belt runs in a direction intersecting the material feeding path, A pair of locking parts each having an inclined support surface inclined in an upwardly expanding direction formed on the opposing inner surface, and a tread pressure portion formed on the lower surface having inclined side surfaces formed on both sides that rest evenly on the inclined support surface. A mounting plate portion that holds the plate; and a vertical holding cylinder that connects a rod to the upper surface of the mounting plate portion and normally holds the inclined side surface of the mounting plate portion in pressure contact with the inclined support surface of the locking portion. A treading device for a belt sander machine, which is characterized by the following: