JP2563858B2 - Belt sanda - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt sander for polishing a material which has been cut and processed, and in particular, after cutting, the surface or corners of a bar which has been formed into various shapes to have a smooth R. Regarding

[0002]

2. Description of the Related Art In recent years, as shown in FIG. 12, there is seen an example in which a thick plate material W is cut into various curved shapes and used as furniture, for example, as a skeleton (leg) of a chair. This aims to provide furniture whose designs are diversified with various shapes of materials. In the case of polishing the surfaces and corners of many kinds of plate materials having such a complicated shape, conventionally, there is no polishing means by a mechanical method, so that it is necessary to rely on human work. However, in recent years, the number of workers has become insufficient and labor costs have become high. Therefore, in order to mass-produce materials with complicated shapes and provide inexpensive ones, it is necessary to consider automation and labor saving. .

[0003]

Normally, when polishing a plate material, the workpiece is pressed against the grinding belt, and the platen is pressed from the back side of the grinding belt to perform the polishing processing.
When polishing the surface or corners of a workpiece having a curved shape, if the platen is flat or there is no cushion, the workpiece W has a polygonal cross section as shown in FIG. 13 (A). Will be polished. Therefore, even after the polishing process, it is necessary to manually re-polish into a smooth shape as shown in FIG. The present invention has been made in view of such problems, and provides a belt sander capable of smoothly polishing the surface and corners of a plate material having a complicated shape and being automatically processed by a robot or the like. Is intended.

[0004]

That is, according to the present invention, a belt sander comprises a grinding belt running endlessly, and a plurality of belt sanders formed with an elastic material or a synthetic resin material to make the surface uneven or flat and pressed from the back side of the grinding belt. Of the platen is detachably attached, a bearing fitting provided with a fixture for rotatably supporting the platen attachment and fixing the platen attachment non-rotatably, and a rotary plate provided on the bearing fitting. A rotary drive mechanism configured to come into contact or non-contact with the rotary pulley of the platen unit; and a drive mechanism that drives the platen unit up and down. Is characterized by. In addition, the platen attachment is configured such that a plurality of types of platens can be replaced. Furthermore, the bearing fittings that make up the platen unit include
It is characterized in that a sensor for selecting a platen is attached around it.

[0005]

The operation when the belt sander of the present invention is used as the above means will be described with reference to the reference numerals in the accompanying drawings. The robot 46 grips and lifts the workpiece placed on the work stand 45 and puts it on the belt sander 1 around which the belt is wound (FIGS. 1 and 2). In this case, a platen that fits the curved shape of the material to be processed is selected. For that purpose, the cylinder 30 is operated to lower the entire platen unit 2, and the pulley 23 is operated.
To the drive pulley 31 which is a drive mechanism.
Drive at 4. The rotating shaft 22 rotates to rotate the platen fixture 21.
When the platen is rotated and the sensor finds a required platen, the pin cylinder 33, which is a rotary shaft fixing tool, operates to fix the rotary shaft 22 when the platen at that time just comes up. Thus, the required platen is selected. The cylinder 30 which is the vertical drive mechanism of the platen unit 2 is operated again to raise the platen unit 2 and the grinding belt 7 is stretched to complete the preparation for polishing the workpiece. The entire platen unit 2 can be removed from the rotary shaft 22 and replaced with another four types of platen units.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan layout view of an entire cutting and polishing apparatus for a plate material on which a belt sander of the present invention is arranged, and FIG. 2 is a front view thereof. Robot 4
A machine (not shown) for processing a workpiece is installed on the side of 1. The robot 41 carries out the work of reciprocating the processed workpieces while stacking them on the yard 42, 43, 44 and transferring them to the work stand 45 in the next step. This work
The workpieces placed on the stand 45 are gripped by the robots 46 one by _one , and the belt sanders 1 ₁ , 1
It is polished by _2, 1 _3. These belt sanders 1
_Nos . ₁ , 1, ₂ and 1 ₃ are arranged so that the number of the polishing belt is changed from the coarse one to the fine one in order and arranged for finishing.

FIG. 3 is a plan view of the belt sander 1 of the present invention, and FIG. 4 is a front view. A platen unit 2 is equipped with four platens having various curved shapes. The number of platens (2A to 2D) mounted on the platen unit 2 is not limited to four and may be increased or decreased. In this case, each platen has a rotary structure that can be exchanged according to the curved shape or cross-sectional shape of the material to be processed. This structure will be described later. A driving roller 3 is driven by the motor 4. Reference numeral 5 is an idler roller, 6 is a tension roller, and an endless grinding belt 7 is wound around these rollers. When the material to be processed is actually polished, the platen unit 2 is moved (the moving mechanism will be described later) to apply tension to the grinding belt 7 as shown by the chain double-dashed line in FIG. More pressed against the work material and polished. The movement of the tension roller 6 that gives tension to the grinding belt 7 is performed by driving the tension roller mounting bracket 8 with the cylinder 9. 10 is the tension roller mounting bracket 8
It is a slide shaft that is fixed to and moves at the same time. The slide shaft 10 is fitted into a slide bush 13 fixed to a bracket 12 fixed to a case 11, and a cylinder 9 for moving a tension roller is also attached to the bracket 12.

In FIG. 5, the platen unit 2 is provided with a case 1.
FIG. 6 is a diagram showing a drive mechanism for moving up and down in FIG. 1, and FIG.
FIG. The platen unit 2 includes a platen attachment 21, a rotary shaft 22, a pulley 23, a bearing fitting 24, a slide unit 25, and the like. In this case, the two slide units 25 are fixed to the bearing metal fittings 24, both sides of which are partially machined. Brackets 26, 2 are provided above and below the case 11 on which the platen unit 2 is arranged.
7 is fixed, and two slide shafts 28 are erected on the brackets 26 and 27, and the slide unit 25 is vertically movably fitted into the slide shafts 28. A cylinder 30 for driving the platen unit is attached to the lower bracket 27. A floating joint 29 is fixed to the lower portion of the bearing fitting 24, and the floating joint 29 is attached to the drive shaft 30a of the cylinder 30. Thus, the platen unit 2 has the cylinder 30
It is driven up and down by.

Next, the rotary structure of the platen unit 2 will be described. The rotary shaft 22 is fitted inside the bearing fitting 24. The platen fitting 21 is provided on one side (the case 11 side) of the rotary shaft 22 and the pulley is provided on the other end side. 23 are attached respectively. When the cylinder 30 is driven, the drive shaft 30a moves up and down, and the platen unit 2 moves up and down.
Reference numeral 31 indicated by a chain double-dashed line in FIG. 6 is a drive pulley which will be described later, and when the platen unit 2 and the like are lowered, the drive pulley 31 comes into contact with the pulley 23 and rotationally drives it. 32 is shown in FIG.
As is also shown, it is an O-ring fitted to the surface of the drive pulley 31 and having a large frictional resistance.

FIG. 7 shows the platen unit 2 and the rotary shaft 2.
2 and a bearing fitting 24, etc., showing an internal structure in the axial direction, FIG. 8 is a sectional view taken along the line AA of FIG. 7, and FIG. The platen unit 2 is equipped with four types of platens 2A, 2B, 2C, and 2D on a platen attachment 21 so that they can be rotated and exchanged according to the purpose of use. That is, the cylinder 30 is driven to drive the platen unit 2
Pull down the whole and pull the pulley 23 attached to the rotary shaft 22.
Are brought into contact with each other through the O-ring 32 of the drive pulley 31 and rotated. Then, at the time of polishing, any one of the platens 2A to 2D required at that time is selected.
As shown in FIG. 10, the platen is made up of an elastic material felt and sponge 16, a foam styrene 17 made of a synthetic resin material, a plywood 18, and the like. The mounting platen mounting tool 21 is mounted by being dovetailed, and the canvas 15 (see FIG. 8) is covered therewith. Further, the sponge 16 is attached to the plywood 18 and covered with the canvas 15, as shown in FIG.
It may not be concave as shown in FIG. This platen unit 2 should be removed from the rotary shaft 22 so that it can be replaced with a platen fixture 21 for mounting other four types of platens in order to polish various types of workpieces having complicated cross-sectional shapes. You can do it.

Next, when the platens 2A, 2B, 2C and 2D are selected, the pulley 23 is driven as described above.
Four pin cylinders 33 are attached to the bearing fitting 24, which is selected while being driven by the cartridge 31. Then, four holes 24a, 24b, 24c, 24d are bored in the bearing fitting 24, and four sensors (not shown) are attached thereto, and when the necessary platen comes to the top, The pin cylinder 33 is sensed and actuated to cause the shaft 33a of the pin cylinder 33 to project. In this way, the platen used at that time is selected and fixed.

Next, the types of the platen will be described. FIG. 11 shows an external view of the platens 2A to 2D and the like. These platens 2A to 2D have a curved upper surface in accordance with the curved shape and cross-sectional shape of the workpiece W as shown in FIG.
As shown in (A), (B), (C), and (D), replace the one having various shapes with the surface uneven or flat according to the curved shape or cross-sectional shape of the workpiece W. It is designed to be attached.

The belt sander of the present invention is constructed as described above, and its operation will be described below. The robot 46 grips and lifts the workpiece W placed on the work stand 45, and first applies it to the belt sander 1 around which a coarse belt is wound. In this case, a platen that fits the curved shape of the workpiece is selected. For that purpose, the cylinder 30 is operated to lower the entire platen unit 2, and the pulley 2
3 is brought into contact with the drive pulley 31 to drive the motor 34.
When the rotary shaft 22 rotates, the platen fixture 21 rotates, and the sensor finds a required platen, the pin cylinder 33 operates to fix the rotary shaft 22 when the platen at that time is just above. Thus, the required platen is selected. Next, the cylinder 30 is activated to raise the platen unit 2 and the grinding belt 7 is stretched to complete the preparation for polishing the workpiece. In this way, four types of platens can be selected. Then, the workpiece grasped by the robot 46 is sequentially polished from the coarse grinding belt to the fine grinding belt by three belt sanders. The entire platen unit 2 can be removed from the rotary shaft 22 and replaced with another four types of platen units.

Although one embodiment of the belt sander of the present invention is as described above, various modified embodiments are possible. For example, four platens are attached, but the number may be reduced or increased. Further, the rotary drive mechanism, the vertical drive mechanism, etc. may be not only a cylinder or a friction wheel mechanism but also a gear mechanism, a belt wheel mechanism, a mechanism using a ball screw, a pinion and a rack mechanism, a linear motor mechanism, or other drive mechanism. .

[0015]

Since the belt sander of the present invention has the structure described in detail above, it is possible to smoothly and automatically grind the surface or the corner portion of the workpiece having various curved shapes, which has been difficult in the past. . Also, with this belt sander, the platen can be automatically replaced according to the curve of the work material, so it is very convenient to use the most suitable platen according to the curve at that time.

[Brief description of drawings]

FIG. 1 is a plan layout view of a belt sander, a processing machine (cutting machine), a robot and the like according to the present invention.

FIG. 2 is a front layout view of a belt sander, a processing machine (cutting machine), a robot and the like according to the present invention.

FIG. 3 is a plan view of the belt sander of the present invention.

FIG. 4 is a front view of the belt sander of the present invention.

FIG. 5 is a diagram showing a drive mechanism for moving a platen unit constituting the belt sander of the present invention up and down in a case.

FIG. 6 is a view on arrow P of FIG.

FIG. 7 is an axial cross-sectional view showing an internal structure of a platen unit, a rotary shaft, metal fittings and the like which constitute the belt sander of the present invention.

8 is a cross-sectional view taken along the line AA of FIG.

9 is a sectional view taken along the line BB of FIG.

FIG. 10 is an external view of a type of platen used in the belt sander of the present invention.

FIG. 11 is an example diagram of a platen having an upper surface having various curved shapes.

FIG. 12 is a perspective view of a work piece obtained by cutting a plate material into a curved shape.

FIG. 13A and FIG. 13B are cross-sectional views of the workpiece after processing.

[Explanation of symbols]

 1 Belt Sander 2 Platen Unit 3 Drive Pully 5 Idler Roller 6 Tension Roller 7 Grinding Belt 9 Cylinder 11 Case 15 Canvas 16 Sponge 17 Foaming Stylus 18 Plywood 21 Platen Fixture 22 Rotating Shaft 23 Pull- 24 bearing bracket 25 slide unit 30 cylinder 31 drive pulley 33 pin cylinder

Claims (3)

(57) [Claims] 1. A grinding belt which runs endlessly, and a platen fitting which is detachably mounted with a plurality of platens which are made of an elastic material or a synthetic resin material to have an uneven or flat surface and which is pressed from the back side of the grinding belt. A platen unit including a bearing fitting that rotatably supports the platen fitting and a fixing tool that fixes the platen fitting non-rotatably, and a rotary pulley that is provided on the bearing fitting, and the platen. A belt sander comprising a rotary drive mechanism configured to come into contact with or not to contact a rotary pulley of the unit, and a drive mechanism for vertically driving the platen unit. 2. The platen fixture is configured such that a plurality of types of platens can be replaced.
Belt sander described in paragraph. 3. The belt sander according to claim 1 or 2, wherein a bearing metal constituting the platen unit is equipped with a platen selection sensor around the bearing metal.