JPS6311271A - Belt grinding attachment - Google Patents

Abstract

PURPOSE:To make a finished surface better as well as to prolong a span of service life, by installing a contact belt between a contact wheel and a driving wheel, and also installing a grinding belt on the outer circumference. CONSTITUTION:A driving wheel 36 is installed between a contact wheel 32 and a pulley 34 and a contact belt is also installed therein, while at the outer circumferential side, a grinding belt 42 is stretched across the contact wheel 32 and the pulley 34. Therefore, since there is no drive motor or pulley, etc., in a part of the contact wheel 32, even if a diameter of the contact wheel 2 is made smaller, a range interfering with a workpiece is little so that an indeterminate workpiece, for example, a small diametral (R) concave surface or the like become grindable. And, since the contact wheel 32 part itself comes to a travel driving part of the grinding belt 42, even if tension is weak, belt travel is stabilized, making a grinding finished surface relatively better, and a span of service life is prolongable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a belt grinding device that provides driving force to the contact wheel itself to improve grinding force and to enable stable running of the grinding belt.

(Prior art) Conventionally, the workpiece to be ground is pressed against a running grinding belt.
Belt grinding devices that perform essential grinding are known. Two methods are used as means for driving this running grinding belt.

In the first method, as shown in FIGS. 11 to 16, the contact wheel 2 does not have a rotary drive section, and the grinding belt 6 and the contact wheel 2 are indirectly driven by a separately provided drive wheel 4. be. The contact wheel 2 has the role of directly supporting or backing up the grinding belt 6 when the object to be ground is pressed against the grinding belt 6 and being ground. In the figure, M is a drive motor that drives the drive wheel 4. 8 is a wheel support body that supports the contact wheel 2. In addition, the first
1 and 12, a tension pulley 10 is provided to adjust the tension of the grinding belt 6.
An example of a point support type is shown, and FIGS. 13 and 14 show an example in which the grinding belt 6 is supported only by the contact wheel 2 and the drive wheel 4 without providing a tension pulley, and is a two-point support type. This shows an example. 15 and 16 show the grinding belt 6 and the object to be ground H.
It shows the state of grinding by pressing. As shown in the figure, when the object to be ground H is brought into diagonal contact with the grinding belt 6, grinding resistance is applied to one side of the grinding belt 6, causing tension T1 on the left and right sides of the running grinding belt 6. The balance of T2 collapses (
TI>T2), especially if the surface of the contact wheel 2 is flexible or the belt tension is relatively small, the running of the grinding belt 6 will not be stable (the grinding belt will shift laterally). Therefore, in this case, it is necessary to increase the hardness of the contact wheel 2 and the tension of the grinding belt 6.

The advantage of the first method is that there is no drive means such as a drive motor or drive pulley in the contact wheel part, and the wheel support can be made compact, so even if the diameter of the contact wheel is small, it will not interfere with the workpiece. Since the area to be ground is small, it is possible to handle irregularly shaped objects.

On the other hand, the disadvantage of the first method is that the contact wheel itself does not have a rotating drive part, so the tension of the grinding belt
If the tension is not strong, the grinding belt cannot be driven stably.For this reason, when using a contact wheel with a soft and elastic outer periphery (such as a rubber hardness of around 30 to 40 degrees), the tension may be too strong and cause elasticity. Furthermore, if a contact wheel with elasticity is used, the running of the grinding belt becomes unstable (shifts laterally) and comes off, which is an inconvenience. If the hardness of the contact wheel is increased, the running of the grinding belt becomes stable, but the finished surface of the object to be ground is relatively poor and the life of the grinding belt is also relatively short.

Next, in the second method, as shown in FIGS. 17 to 22, the contact wheel 2 itself is directly driven by the drive motor M. In the figure, reference numeral 12 denotes an idle pulley provided corresponding to the contact wheel 2, which supports and constructs the grinding belt 6 together with the contact wheel 2 and the tension pulley 10. 17th
18 and 18 show that a drive pulley 16 connected to the side of the contact wheel 2 via a support 14 and a drive motor M are connected by a drive belt 18, and the rotation of the drive motor M is controlled by the drive and the contact wheel 2 is transmitted to the contact wheel 2 to rotate the contact wheel 2. 19 and 20, the contact wheel 2 and the drive motor M are directly connected by a drive shaft 20, and the rotation of the drive motor M is directly transmitted to the contact wheel 2. In FIGS. FIGS. 21 and 22 show a state in which the object to be ground H is pressed against the grinding belt 6 to be ground. As shown in the figure, the left and right tensions T1. Since the balance of T2 is not lost, the running of the grinding belt 6 is stable.

The advantage of this second method is that the contact wheel itself has a rotating drive part, so even if the tension of the grinding belt is weakened, the grinding belt runs stably, and therefore the outer periphery of the contact wheel itself is soft and elastic. (Rubber hardness is around 30 to 40 degrees, etc.) The grinding belt will not come off even if the material is hard. By using a soft contact wheel, the grinding surface will be good and the life of the grinding belt will be longer. occurs.

On the other hand, the disadvantage of the second method is that the support part 14 and drive pulley 16 in FIGS. 17 and 18 or the drive shaft 20 and drive motor M in FIGS. Because they are installed side by side on the side of the
Particularly when the contact wheel has a small diameter, the above-mentioned members interfere with each other, making it impossible to grind an irregularly shaped object.

As described above, each drive system has its advantages and disadvantages, and the current situation is that a belt grinding device that eliminates the disadvantages while retaining these advantages is awaited.

(Problems to be Solved by the Invention) The present invention was invented as a result of repeated research to solve the above-mentioned problems of the prior art. A contact belt is installed between the contact wheel and the drive wheel, and a grinding belt is installed between the contact wheel and the pulley at the outer periphery of the contact belt. Since there are no pulleys, etc., even if the diameter of the contact wheel is reduced, there is less interference with the object to be ground.It is suitable for grinding objects with irregular shapes, such as objects with a concave surface with a small diameter R, or the inner surface of a mold with carvings. In addition, since the contact wheel part itself becomes the running drive part of the grinding belt, the running of the grinding belt is stable even if the tension of the grinding belt is weak, and furthermore, the outer periphery of the contact belt itself is a soft elastic body. Since the running of the belt is stable, it is possible to achieve a relatively good grinding surface and extend the life of the grinding belt (belt life), so to speak, it combines the advantages of the two conventional drive systems mentioned above. The purpose is to provide an excellent belt grinding device.

(Means for Solving the Problem) The gist of the present invention is to provide a contact wheel, a pulley provided opposite to the contact wheel, and a drive wheel provided between the contact wheel and the pulley. A belt grinding device comprising: a contact belt mounted on the drive wheel and the contact wheel; and a grinding belt located on the outer peripheral side of the contact belt and mounted on the contact wheel and the pulley. exists in

The pulley may be a tension pulley, or the pulley may be an idle pulley, and a tension pulley for adjusting the tension of the grinding belt may be provided in contact with the inner peripheral surface of the grinding belt.

The contact belt can be a flat belt whose surface or whole is made of an elastic material such as rubber, and serrations can be provided on the outer peripheral surface of the flat belt to improve its grinding power. Further, by providing a soft elastic material such as urethane foam on the outer circumferential surface of the flat belt, it is possible to improve the finished surface of the grinder and extend the life of the grinding belt.

The contact belt is a toothed belt in which both the contact wheel and the driving wheel are formed of gears, the inner circumferential surface has teeth corresponding to the teeth of the gears, and the outer circumferential surface is made flat by an elastic body such as rubber. If used as a contact wheel, it has the advantage of increasing the horsepower transmitted from the drive wheel to the contact wheel. Moreover, the grinding force can be improved by providing serrations on the outer peripheral surface of the toothed belt. Furthermore, by providing a soft elastic material such as urethane foam on the outer peripheral surface of the toothed belt, it is possible to improve the finished surface of the grinder and extend the life of the grinder belt.

(Example) An example of the present invention will be described below in Figures 1 to 10 in the accompanying drawings.
This will be explained based on the diagram.

In FIGS. 1 and 2, reference numeral 30 denotes a belt grinding device according to the present invention, which has a contact wheel 32 and a pulley 34 provided opposite to the contact wheel 32. 36 is the contact wheel 32 and the pulley 34
The rotation of the drive motor M is transmitted by a drive belt 38 through a drive wheel located between the drive belt 38 and the drive wheel 38 .

40 is a contact belt, and the contact wheel 32
and the drive wheel 36, and the drive wheel 36
The contact wheel 32 functions to transmit the rotation of the contact wheel 32 to the contact wheel 32.

A grinding belt 42 is located on the outer peripheral side of the contact belt 40 and is installed over the contact wheel 32 and the pulley 34 . The pulley 34 is an idle pulley, and the tension of the grinding belt 42 is adjusted by a tension boob I provided in contact with the inner peripheral surface of the grinding belt 42.
This is done by J44.

The contact wheel 32 connects the grinding belt 4 to the object to be ground.
2 has the role of directly supporting (backing up) the grinding belt 42 when grinding is performed.

The tension boob I744 is not necessarily essential, and as shown in FIGS. 3 and 4, it is also possible to have the pulley 34 act as a tension pulley and omit the tension boob I744.

Although there are no particular restrictions on the shape and material of the contact bell (40) used in the present invention, a flat belt whose surface or entire surface is made of an elastic body such as rubber can be used (FIG. 5). Furthermore, the grinding force can be improved by providing serrations 46 on the outer peripheral surface of the flat belt (FIG. 6). Furthermore, by providing a soft elastic material 48, such as foamed urethane, on the outer peripheral surface of the flat belt, it is possible to obtain a good ground surface and extend the life of the grinding belt 42 (FIG. 7).

Both the contact wheel 32 and the drive wheel 38 are constructed of gears, and the contact bell 40 has teeth 50 corresponding to the teeth of the gears on its inner peripheral surface, and its outer peripheral surface is made of an elastic material such as rubber to form a flat surface. toothed belt 4
If 0a is used (FIG. 8), there is an advantage that the horsepower transmitted from the drive wheel 38 to the contact wheel 32 becomes large. Furthermore, the grinding force can be improved by providing serrations 46 on the outer peripheral surface of the toothed belt 40a (
Figure 9). Furthermore, a soft elastic body 48, such as urethane foam, etc., is provided on the outer peripheral surface of the toothed bell) 40a.
(Fig. 0), it is possible to improve the ground surface finish and extend the life of the grinding belt.

(Operation) With the above configuration, when the drive motor M is driven, the drive wheel 36 rotates via the drive belt 38, and then the contact belt 40 rotates and the contact wheel 32 rotates. The contact belt 40
As the contact wheel 32 rotates, the grinding belt 42 rotates and the pulley 34 also rotates. With the grinding belt 42 rotating in this manner, the object to be ground is pressed against the grinding belt 42, thereby grinding the object. The grinding belt 42 may be pressed against a portion of the contact wheel 32, or may be separated from the contact wheel 32 and used alone for grinding.

There are no obstacles such as a drive motor or a drive pulley in the area around the contact wheel 32, unlike in conventional devices.
Even if the diameter of the contact wheel 32 is made smaller, there is less interference with the object to be ground, and it is possible to grind irregularly shaped objects, such as objects with a concave surface with a small diameter R, or the inner surface of a die with carvings. be able to.

Since the contact wheel 32 serves as a running drive portion of the grinding belt 42, the running of the grinding belt 42 is stable even if the tension of the grinding belt 42 is weak.

(Effects of the Invention) As described above, according to the present invention, since there is no drive motor or drive pulley in the contact wheel portion, even if the diameter of the contact wheel is made small, the area where it interferes with the object to be ground is small and the shape is irregular. It is possible to grind objects to be ground, such as objects with a concave surface with a small diameter R, or the inner surface of a mold with a carving, and since the contact wheel itself serves as the running drive part of the grinding belt, the tension of the grinding belt is reduced. The running of the abrasive belt is stable even if the contact belt is weak, and the running of the belt is stable even if the outer periphery of the contact belt itself is a soft elastic material. ) can also be made longer, which is a great effect. In particular, the contact wheel can be made small in diameter, and driving force can be applied to the contact wheel. ■Improved grinding power. ■A soft tension mechanism is now available for the grinding belt, allowing soft touching to the object to be ground and applying a soft constant pressure. ■Not affected by heat generated by small diameter wheels. ■The small diameter wheel itself does not have a drive unit, so it can be made compact. ■The grinding belt is stable.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing one embodiment of the present invention, FIG. 2 is a perspective view of the same as above, FIG. 3 is a schematic side view showing another embodiment of the present invention, and FIG. is a perspective explanatory view of the same as above,
FIGS. 5 to 7 are partially sectional partial perspective views showing modified examples of the contact belt used in the present invention, and FIGS.
FIG. 10 is a partially cross-sectional partial perspective view showing a modified example in which the contact belt of the present invention is a toothed belt, FIG. 11 is a schematic side view showing an example of the first conventional device, and FIG.
FIG. 13 is a schematic side view showing another example of the first conventional device, FIG. 14 is a perspective explanatory view of the same, and FIG. 15 is a perspective view of the first conventional device. FIG. 16 is a top view of the main part of FIG. 15, FIG. 17 is a schematic side view of an example of the second conventional device, and FIG. 18 is the same as above. FIG. 19 is a schematic side view showing another example of the second conventional device, FIG. 20 is a perspective view of the same, and FIG. Perspective explanatory diagram showing the grinding state and the 22nd
The figure is an explanatory top view of the main part of FIG. 21. 30-belt grinding device, 32-contact wheel, 3
4-pulley, 36--driving wheel, 38--driving wheel, 40-contact belt, 42--grinding belt, 46--serration, 48-4 coarse elastic body, 50-tooth patent applicant Daidoji Yasuei Patent Attorney Ishihara Eiji 2/14 Figure 1
Figure 2 Figure 15 Figure 21

Claims (9)

[Claims] (1) a contact wheel, a pulley provided opposite to the contact wheel, and a drive wheel provided between the contact wheel and the pulley;
A belt grinding device comprising: a drive wheel; a contact belt mounted on the contact wheel; and a grinding belt located on the outer peripheral side of the contact belt and mounted on the contact wheel and the pulley. (2) The belt grinding device according to claim 1, wherein the pulley is a tension pulley. (3) Belt grinding according to claim 1, characterized in that the pulley is an idle pulley, and a tension pulley for adjusting the tension of the grinding belt is provided in contact with the inner peripheral surface of the grinding belt. Device. (4) The belt grinding device according to any one of claims 1 to 3, wherein the contact belt is a flat belt whose surface or entirety is made of an elastic material such as rubber. (5) The belt grinding device according to claim 4, wherein serrations are provided on the outer peripheral surface of the flat belt. (6) The belt grinding device according to claim 4, characterized in that a soft elastic body is provided on the outer peripheral surface of the flat belt. (7) A toothed belt in which both the contact wheel and the drive wheel are made of gears, the inner circumferential surface has teeth corresponding to the teeth of the gears, and the outer circumferential surface is made flat with an elastic body such as rubber. Any one of claims 1 to 3, characterized in that it is used as the contact belt.
Belt grinding device as described in section. (8) The belt grinding device according to claim 7, wherein serrations are provided on the outer peripheral surface of the toothed belt. (9) The belt grinding device according to claim 7, characterized in that a soft elastic body is provided on the outer peripheral surface of the toothed belt.