Belt sander and method for using a belt sander

Abstract

A belt sander having a belt and an adjustable support that is located at an acute angle relative to the belt is characterized in that the support has a support bolt and interspaced thereto a movable abutment pin.

Description

Belt sander and method for using a belt sander

[0001] The invention relates to a belt sander with a belt and a support arranged at an adjustable, acute angle to the belt and a method for using a belt sander.

[0002] Knives must be sharpened regularly to stay sharp. For this purpose, knives are usually sharpened on a whetstone. However, the present invention relates to the specific use of a belt grinder for sharpening knives. To reliably and accurately sharpen a knife, belt grinders are known with a support arranged at an adjustable, acute angle to the belt. The knife can be placed on this support so that the belt engages the knife at a defined angle to sharpen it.

[0003] If a blade has multiple cutting edges, all edges should be sharpened as evenly as possible. This applies to the position of the blade during the sharpening process and, in particular, the relative angle of the blade edge and the blade. Such blades with multiple cutting edges usually have a bore from which the cutting edges are arranged at equal distances. A well-known example is lawnmower blades or rotating blades on hedge trimmers.

[0004] Based on this state of the art, the object of the invention is to further develop a belt grinder so that, in particular, knives with multiple cutting edges can be ground quickly and precisely.

[0005] This task is solved with a belt sander with a belt and a support arranged at an adjustable, acute angle to the belt, in which the support has a support bolt and a movable support pin at a distance from it.

[0006] This allows the knife to be placed on the support pin in such a way that it can be rotated around the pin but cannot be moved relative to the pin. The support pin, which is spaced apart from the support pin, is arranged in such a way that it facilitates the placement of the knife on the Confirmation copy the support pin is not obstructed and on the other hand, moving the support pin leads to a contact with the knife in order to rotate the knife around the support pin.

[0007] Since the support bolt and the support pin are attached to the support and since the support is arranged at an adjustable, acute angle to the belt, a movement of the knife around the support bolt induced by the support pin leads to a defined movement of the cutting edge of the knife relative to the belt of the belt sander.

[0008] The contact pin should preferably be moved along a defined path. For this purpose, a slotted hole is suggested in which the contact pin can be moved.

[0009] Accordingly, the support bolt should preferably be moved along a defined path and therefore a slotted hole is also proposed for the support bolt in which it is arranged so that it can be moved.

[0010] A particularly simple structure is achieved by arranging the elongated hole of the support pin and the elongated hole of the support bolt parallel to each other.

[0011] The support can be of any shape that allows a knife to be held at a specific angle to the belt sander's belt. However, it is advantageous if the support is a plate.

[0012] A special design allows the support to pivot around an axis. This makes it possible to grind knives on different sides of the same support, especially without changing the position of the support bolt.

[0013] The axis around which the support can pivot should extend at the acute angle to the belt at which the support is arranged to the belt.

[0014] Easy handling is achieved if the support is arranged over the axis on a base plate parallel to the support.

[0015] This base plate can then be height-adjustable relative to the belt.

[0016] In addition, the base plate can be angle-adjustable relative to the belt.

[0017] The object underlying the invention is also achieved by a method for using a belt grinder, in which a knife is placed on a support and a first side of the knife is ground and then the support is pivoted about an axis and a second side of the knife is ground.

[0018] A particularly preferred embodiment is shown in the drawing and is described below. It shows the Figure 1 is a perspective view of a belt sander with a support, Figure 2 shows the belt sander shown in Figure 1 with a knife on the support, Figure 3 shows the belt sander shown in Figure 1 with the belt sander pivoted around an axis Edition and Figure 4 shows the belt sander shown in Figure 1 with pivoted support and the knife.

[0019] The figures each show only the relevant area of ​​the belt sander 1, in which the knife 7 is held against the belt 2. For this purpose, the belt sander 1 has a rotating belt 2 that serves as an abrasive. The support 4 is arranged at an adjustable, acute angle 3 to the belt 2. This support 4 has a support bolt 5 and, spaced from this support bolt 5, a movable contact pin 6. This makes it possible, as shown in Figure 2, to place the knife 7 on the support bolt 5 in such a way that it can rotate about the support bolt 5. The contact pin 6, which is movable in a slot 8, can be moved along the slot 8 in such a way that the contact pin is pressed against the knife 7, so that on the one hand the knife 7 rotates about the support bolt 5 and on the other hand the cutting edge 9 of the knife 7 moves along the belt 2.

[0020] The exact position of the knife 7 relative to the belt 2 can be changed by adjusting the position of the support pin 5. For this purpose, an additional slot 10 is provided, along which the support pin 5 can be moved and fixed. The slots 8 and 10 are positioned on parallel lines and can also be designed and arranged differently. For example, curved slots 8 and 10 can also be provided, arranged depending on the knife 7 to be sharpened. In this way, different supports 4 can be used if very different knives 7 are to be sharpened.

[0021] Thus, the knife 7 is first placed on the support pin 5 and optimally positioned relative to the belt 2. The support pin 5 is then fixed in position. The support pin 6 is then moved along the elongated hole 8 to precisely grind the knife 7 on the belt 2.

[0022] The support 4 is a plate 11 that is pivotable about an axis 12 and is mounted on a base plate 13. The base plate 13 and the axis 12 are arranged at the same angle 3 to the belt 2 as the support 4 is to the belt 2. This ensures that the plate 11, even when pivoted about the axis 12, is still arranged at the same angle 3 to the belt. Therefore, a knife 7 can first be placed on one side of the plate 11 by placing it on the support pin 5. After one side of the knife 7 has been sharpened, the knife 7 can be removed from the support pin 5. The plate 11 is folded around the axis 12 and then lies on the other side of the base plate 13. The support pin 5, which extends through the elongated hole 8, then serves again as a support 4 for the knife 7, as shown in Figure 4.

[0023] The contact pin 6 also extends through the further elongated hole 10 so that after the plate 11 has been folded over, it can again be used to press against the knife so that the cutting edge 9 of the knife 7 is ground on the belt 2.

[0024] Figure 3 shows how the position of the support 4 relative to the belt 2 can be changed and fixed by adjusting the angle 3.

Claims

Patent claims:

1. Belt sander (1) with a belt (2) and a support (4) arranged at an adjustable, acute angle (3) to the belt (2), characterized in that the support (4) has a support bolt (5) and, spaced therefrom, a displaceable support pin (6).

2. Belt sander according to claim 1, characterized in that the support pin (6) can be moved into an elongated hole (8).

3. Belt sander according to one of the preceding claims, characterized in that the support bolt (5) is displaceable in a further elongated hole (10).

4. Belt sander according to claim 2 and 3, characterized in that the elongated hole (8) of the support pin (6) and the further elongated hole (10) of the support bolt (5) are arranged parallel to each other.

5. Belt sander according to one of the preceding claims, characterized in that the support (4) is a plate (11).

6. Belt sander according to one of the preceding claims, characterized in that the support (4) is pivotable about an axis (12).

7. Belt sander according to claim 6, characterized in that the axis (12) extends at the acute angle (3) to the belt (2) at which the support (4) is arranged to the belt (2).

8. Belt sander according to claim 6 or 7, characterized in that the support (4) is arranged via the axis (12) on a base plate (13) parallel to the support (4).

9. Belt sander according to claim 8, characterized in that the base plate is height-adjustable relative to the belt.

10. Belt sander according to claim 8 or 9, characterized in that the base plate is angle-adjustable relative to the belt. 1 . Method for using a belt sander, in particular according to one of the preceding claims, in which a knife (7) is placed on a support (4) and a first side of the knife (7) is ground and then the support (4) is pivoted about an axis (12) and a second side of the knife (7) is ground.