JP4349494B2 - Disc blade grinding machine - Google Patents

Description

  The present invention relates to a disk blade grinding apparatus for grinding a disk blade such as a mower.

Conventionally, a disc blade grinding operation has been performed in order to use a disc blade of a mowing machine many times without being discarded after use. In view of this, a disk blade grinding apparatus has been devised by the present inventor for carrying out the grinding operation of the disk blade (Actual Application Nos. 2-9471 and 4-74913). Also, for example, a polishing machine such as a chip saw has been devised by companies and the like (Japanese Patent Laid-Open No. 7-112317, etc.). However, it is conceivable that the polishing machine such as the tip saw has a high cost because it has many components. Moreover, since it is the structure which moves a disk blade, it is thought that it is also necessary to improve safety | security further. It is also necessary to improve the grinding accuracy.

  Then, this inventor aims at investigating the cause of such a subject and solving such a subject.

  The gist of the disk blade grinding apparatus according to the present invention is that a disk blade fixing base for fixing the disk blade at an axial center portion, and the disk blade fixed to the disk blade fixing base are rotated in one direction by a predetermined angle. A predetermined angle rotating means to be rotated, a grinding apparatus having a grinding wheel to be driven to rotate, and a link that is linked to rotation of the predetermined angle by the predetermined angle rotating means to separate or approach the grinding apparatus and the disk blade from each other And the link mechanism is configured to move the grinding device away from or close to the grinding device. In particular, a frictional force is generated between the lever and the disk blade fixing base by a spring, and when the lever is rotated in the one direction, the disk blade fixing base is rotated by the frictional force. When the lever is rotated in the reverse direction, the disk blade fixing base is not rotated in the reverse direction by an urging force exceeding the frictional force.

  Such a disc blade grinding apparatus of the present invention is configured to move the grinding device side so that the grinding device and the disc blade are separated from each other or approach each other, and thus has a complicated mechanism for rotating the disc blade. There is no need to move the angle rotating means side. Since it is not necessary to move the predetermined angle rotating means side having a complicated mechanism, the mechanism as the entire disk blade grinding apparatus is simplified. In addition, since the grinding device and the disk blade are moved closer to each other by moving the grinding device side, it is easy to check the state in which the grinding wheel is in contact with the blade of the disk blade, while the grinding device and the disk blade are in contact with each other. You can get close. That is, the grinding work is performed in the same manner as the conventional grinding work that is performed by the operator holding the grinding machine in his / her hand, and the grinding work is performed with the operator's natural sensitivity. Further, since it is not necessary to move the predetermined angle rotating means side, it is not necessary to move a disk blade having a blade which is a sharp blade, and safety is improved.

  Further, the gist of the disk blade grinding apparatus according to the present invention is to move the grinding apparatus in a substantially linear shape.

  Such a disk blade grinding apparatus of the present invention is such that a moving table on which a grinding apparatus is fixed is connected to a base by two substantially parallel links, and the instantaneous center of the grinding apparatus is located far away or infinitely. The configuration is such that the grinding device is moved substantially linearly. Since the grinding device is configured to move substantially linearly, the grinding wheel comes into contact with the disk blade while moving substantially linearly. Since the grinding wheel contacts the disk blade while moving substantially linearly, the disk blade is ground while the grinding wheel uniformly contacts the disk blade, and the grinding accuracy is improved. In addition, since the grinding device moves substantially linearly, the movement trajectory of the grinding device becomes simple. Since the movement trajectory of the grinding apparatus becomes simple, the operator can easily predict the movement trajectory of the grinding apparatus.

  Further, the gist of the disk blade grinding apparatus according to the present invention is that the disk blade fixing base for fixing the disk blade at the axial center portion and the disk blade fixed to the disk blade fixing base in one direction at a predetermined angle. And a grinding device having a rotating grindstone that is driven to rotate, and the grinding device and the disk blade are separated from each other or approached in conjunction with rotation of a predetermined angle by the predetermined angle rotating device. In the disk blade grinding apparatus provided with the link mechanism to be moved, the predetermined angle rotation means is fixed to the disk blade fixing base and can be rotated around the fixed shaft fixed on the base and the fixed shaft. A rotating member, a lever that rotates the rotating member in one direction by a substantially constant frictional force or pressing force, and an urging unit that applies an urging force to the disk blade so as not to reversely rotate. It is in.

  Such a disk blade grinding device of the present invention is configured to rotate the rotating member in conjunction with the lever using a frictional force or a pressing force. Because frictional force or pressing force is used, there is no need to provide an interlocking mechanism using a latching member.

    According to the disk blade grinding apparatus according to the present invention, since it is not necessary to move the predetermined angle rotating means side having a complicated mechanism, the mechanism as the entire disk blade grinding apparatus can be simplified. For this reason, it becomes possible to reduce manufacturing cost. In addition, the grinding device side is moved so that the grinding device and the disc blade are close to each other, and the grinding operation is performed in the same manner as the conventional grinding operation that is performed by the operator holding the grinding machine in hand. Can do. For this reason, the state in which the grinding wheel is in contact with the blade of the disk blade can be easily confirmed, and the grinding accuracy can be improved. Moreover, since it is not necessary to move the predetermined angle rotation means side, it is not necessary to move the disk blade which has a blade which is a sharp blade. For this reason, safety can be improved.

  Moreover, it becomes possible to equip a disk blade easily with a safety cover by setting it as the structure which fixes the disk blade side. In addition, a device for spraying the grinding liquid onto the disk blade, a device for cleaning by blowing dust from grinding, and the like can be easily attached.

  Further, according to the disk blade grinding device of the present invention, wherein the grinding device is moved in a substantially straight line, the movable table on which the grinding device is fixed is connected to the base by two substantially parallel links, and grinding is performed. By positioning the instantaneous center of the device at a distance or at infinity, etc., the grinding wheel can be brought into contact with the disk blade while moving in a substantially linear motion, so that the grinding wheel can be uniformly contacted with the disk blade for grinding. it can. For this reason, not only can the entire blade part of the disk blade be ground, but also the outer shape of the disk blade can be prevented from being changed, and the disk blade and the grinding wheel can be prevented from being damaged. Moreover, since it can grind over the whole blade part of a disk blade, a grinding precision can be improved. Further, since the grinding wheel can be brought into contact with the disk blade while being moved substantially linearly, it is easy for the operator to predict the movement trajectory of the grinding apparatus. For this reason, the grinding wheel can be brought into contact with the blade of the disk blade safely and reliably.

  Further, the predetermined angle rotating means includes a fixed shaft fixed on the base, a rotating member that can be rotated around the fixed shaft and fixed to the disk blade fixing base, and the rotating member having a substantially constant frictional force. Alternatively, according to the disk blade grinding apparatus of the present invention, which is configured to include a lever that rotates in one direction by a pressing force and a biasing unit that applies a biasing force to the disk blade so as not to reversely rotate, Since the rotating member is rotated in conjunction with the lever using force or pressing force, it is not necessary to provide an interlocking mechanism using a latching member or the like. For this reason, cost can be reduced and handling can be made easy.

  Next, an embodiment of a disk blade grinding apparatus according to the present invention will be described in detail based on the drawings.

  In FIG. 1, reference numeral 10 denotes a disk blade grinding apparatus according to the present invention. This disk blade grinding apparatus 10 includes a disk blade fixing base 14 for fixing the disk blade 12 at its axial center, and a predetermined angle for rotating the disk blade 12 fixed to the disk blade fixing base 14 in one direction by a predetermined angle. A rotating device 16, a grinding device 20 having a grinding wheel 18 that is driven to rotate, and a link that moves the grinding device 20 and the disk blade 12 apart from each other or approaches them in conjunction with the rotation at a predetermined angle by the predetermined angle rotating device 16 And a mechanism 22.

  Here, the link mechanism 22 includes a moving table 24 to which the grinding device 20 is fixed, a link bar 28 that links the base 26 and the moving table 24, and a link bar 30 that links the moving table 24 and the lever 31. It is configured. That is, when the lever 31 is rotated, the moving table 24 is rotated around the link point 32, and the grinding device 20 itself is moved substantially linearly.

  The predetermined angle rotating means 16 includes a fixed shaft 34 fixed on the base 26, a rotating member 36 that can be rotated around the fixed shaft 34 and fixed to the disk blade fixing base 14, and a rotating member The lever 31 is configured to rotate the plate 36 in one direction by a substantially constant frictional force or pressing force, and a biasing means 38 that applies a biasing force to the disk blade 12 so as not to reversely rotate. The lever 31 is rotatably engaged with the rotating member 36, and a substantially constant frictional force or pressing force is generated between the lever 31 and the rotating member 36 by the spring 40. The biasing means 38 is configured to press the pin 44 against the groove of the disk blade 12 by the biasing force of the spring 42. That is, when the lever 31 is rotated in one direction, the rotating member 36 is interlocked and rotated around the fixed shaft 34 by this frictional force or pressing force, and the lever 31 is rotated in the opposite direction. In this case, the rotating member 36 is prevented from rotating in the reverse direction by the biasing force of the biasing means 38 exceeding the frictional force or the pressing force.

  In such a disk blade grinding apparatus 10, first, the grinding apparatus 20 is rotationally driven in a state where the disk blade 12 is fixed to the disk blade fixing base 14. Next, when the lever 31 is rotated clockwise by a predetermined angle, the moving base 24 moves substantially linearly, and the grinding blade 18 contacts the blade of the disk blade 12 as shown in FIG. It becomes. The disc blade 12 is ground with the grinding blade 18 in contact with the disc blade 12.

  Next, when the grinding of one blade is completed, the lever 31 is rotated in the opposite direction, whereby the disk blade 12 is simultaneously rotated while the movable table 24 is separated from the disk blade 12. The predetermined angle for rotating the lever 31 may be for a plurality of pitches in addition to the pitch of one blade of the disk blade 12. In this way, the plurality of blades of the disk blade 12 are sequentially ground. Here, FIG. 1 shows the case where the circumferential surface of the disk blade 12 is ground in the blade surface, but the radial surface of the disk blade 12 can also be ground. That is, the grinding table 48 is moved on the base 26 by loosening the screw 46, and the grinding wheel 18 is directed in the substantially radial direction of the disk blade 12 as shown in FIG. It is possible.

  According to such a disk blade grinding apparatus 10, since it is not necessary to move the predetermined angle rotation means 16 side, the mechanism as the disk blade grinding apparatus 10 whole can be simplified. Further, the grinding device 20 side is moved so that the grinding device 20 and the disk blade 12 are brought close to each other, and the grinding work is performed in the same manner as the conventional grinding work performed by the operator holding the grinding machine in hand. It can be performed. For this reason, the state in which the grinding wheel 18 is in contact with the blade of the disk blade 12 can be easily confirmed, and the grinding accuracy can be improved. Moreover, since it is not necessary to move the predetermined angle rotation means 16 side, it is not necessary to move the disk blade 12 having a blade which is a sharp blade. For this reason, safety can be improved.

  In addition, since the grinding device 20 is configured to move substantially linearly, it is easy for the operator to predict the movement trajectory of the grinding device 20. For this reason, the grinding wheel 18 can be brought into contact with the blade of the disk blade 12 safely and reliably.

  In addition, since the rotation member 36 is rotated in conjunction with the lever 31 using a frictional force or a pressing force, it is not necessary to provide an interlocking mechanism using a latching member or the like. For this reason, cost can be reduced and handling can be made easy.

  As mentioned above, although one Embodiment of this invention was described, the disc blade grinding | polishing apparatus which concerns on this invention can be implemented also with another form.

  For example, the disk blade grinding apparatus 10 of the present invention may be configured by a link mechanism 112 as shown in FIG. The link mechanism 112 includes a link 114 that connects the lever 31 and the moving table 24, and links 116 and 118 that connect the moving table 24 and the base 26.

  In this link mechanism 112, the instantaneous center of the straight line b connecting the pin 120 that rotatably couples the link 116 to the moving base 24 and the pin 122 that rotatably couples the link 118 to the moving base 24 is shown in FIG. As shown by the three-moment center theorem (Kennedy's theorem), this is the intersection O of the extension line of the center line a of the link 116 and the extension line of the center line c of the link 118. Here, since the straight line b is on the moving table 24 to which the grinding device 20 is fixed, the instantaneous center of the grinding device 20 is a point O. As shown in FIG. 3, this point O is far away from the base 26. Since the point O is far away, the grinding wheel 18 of the grinding device 20 approaches the disk blade 12 while performing a substantially linear motion, as shown in FIG. Since the grinding wheel 18 approaches the disk blade 12 while making a substantially linear motion and contacts the outer peripheral portion 124 of the blade, the grinding wheel 18 contacts the outer peripheral portion 124 uniformly.

  According to the transfer method, the moving speed of the pins 120 and 122 is proportional to the distance to the instantaneous center point O. Therefore, if the distance from the pins 120 and 122 to the instantaneous center point O is long, the moving speed of the pin 120 is The difference from the moving speed of the pin 122 is reduced. For example, if the distance from the pin 120 to the instantaneous center point O is L1, the distance from the pin 122 to the instantaneous center point O is L2, the moving speed of the pin 120 is V1, and the moving speed of the pin 122 is V2, V2 = (L2 / L1) · V1, so if L1 and L2 are long, L2 / L1 is close to 1, and V2 is substantially the same as V1. That is, in the link mechanism 112 of the disk blade grinding apparatus 10 of the present invention, V2 is substantially the same as V1 because the instantaneous center hand O is far and L1 and L2 are long. Since V2 is substantially the same as V1, the grinding device 20 moves at substantially the same speed throughout. Since the grinding device 20 moves at substantially the same speed throughout, the grinding wheel 18 comes into uniform contact with the outer peripheral portion 124. Although not shown, the accelerations of the pins 120 and 122 are substantially the same.

  When the instantaneous center is close and the grinding device 20 performs an arc motion, as shown in FIG. 5, the grinding wheel 18 first contacts the tip 126 side in the outer peripheral portion 124. The grinding wheel 18 cannot uniformly contact the outer peripheral portion 124. That is, the link mechanism 112 used in the disk blade grinding apparatus 10 of the present invention can bring the grinding wheel 18 into contact with the entire outer peripheral portion 124 substantially simultaneously, and can solve such problems.

  According to such a link mechanism 112, the grinding wheel 18 can be brought into contact with the outer peripheral portion 124 of the blade while being moved substantially linearly, so that the grinding wheel 18 can be uniformly brought into contact with the outer peripheral portion 124 and ground. it can. For this reason, not only can the entire outer periphery 124 be ground, but also the outer shape of the disk blade 12 can be prevented from being changed, and the disk blade 12 and the grinding wheel 18 can be prevented from being damaged. In addition, since the entire outer peripheral portion 124 can be ground uniformly, the grinding accuracy can be improved. When the grinding table 48 is moved on the base 26 by loosening the screw 46 and the grinding wheel 18 is directed in the substantially radial direction of the disk blade 12 as shown in FIG. The same effect can be obtained.

  In this link mechanism 112, the links 116 and 118 may be configured to be parallel so that the grinding device 20 performs a complete linear motion with the instantaneous center set at infinity. Further, the position of the pins 120, 122, 125 and 127 can be changed, and the contact state between the grinding wheel 18 and the outer peripheral portion 124 can be adjusted by adjusting the position of the point o at the instantaneous center. You may do it. For example, the position of the pin 120 or the like can be changed by inserting the pin 120 or the like into the slot of the base 26 and stopping it with a screw or the like. The position of the pin 120 or the like can also be changed by providing a plurality of holes in the base 26 for fixing the pin 120 or the like.

  As mentioned above, although the Example of this invention was described based on drawing, the disc blade grinding | polishing apparatus of this invention can be implemented also in another aspect.

  For example, the disk blade grinding apparatus 10 of the present invention is not limited to the case of using the above-described disk blade 12 having a chip, and may be used for grinding the disk blade 12 having no chip. Conversely, the disk blade grinding device 50 may be used for grinding a disk blade having a chip. The means for interlocking the rotating member with the lever by frictional force or pressing force is not limited to the above-described spring 40, and rubber, resin, etc. are fixed by fixing a member such as rubber or resin to the rotating member or lever. A frictional force or a pressing force may be generated between the member and the rotating member or the lever. Moreover, the thing using the frictional force or pressing force of members, such as this rubber | gum and resin, may be used.

  Further, in the disk blade grinding device of the present invention, the means for moving the grinding device substantially linearly is not limited to the above-mentioned link mechanism, and includes a mechanism in which the link is rotatably attached to the slider by a pin, Those using the piston movement of a cylinder, those equipped with a screw rod and a sliding member that slides when the screw rod is engaged with the screw rod and rotated, or a cage tong, etc. There may be.

  In addition, the present invention can be implemented with various improvements, corrections and modifications based on the knowledge of those skilled in the art without departing from the spirit of the present invention.

It is a figure which shows embodiment of the disc blade grinding | polishing apparatus which concerns on this invention, The figure (a) is a top view, The figure (b) is a partial side view. It is a partially expanded plan view which shows the other use condition of the disk blade grinding apparatus shown in FIG. It is the schematic which shows the other Example of the link mechanism of the disk blade grinding apparatus shown in FIG. It is an enlarged plan view for demonstrating the grinding state of the disk blade grinding apparatus shown in FIG. It is an enlarged plan view for demonstrating the effect of the link mechanism of the disk blade grinding apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10; Disc blade grinding device 12; Disc blade 14; Disc blade fixing stand 16; Predetermined angle rotation means 18; Grinding wheel 20; Grinding device 22, 112; Link mechanism 26, 100; Base 31; Lever 34; Rotating member 38; biasing means 40; spring 126; tip

Claims (2)

A disk blade fixing base for fixing the disk blade at the axial center, and
A predetermined angle rotating means for rotating the disk blade fixed to the disk blade fixing base in one direction by a predetermined angle by rotating the lever around the shaft center portion;
A grinding apparatus having a grinding wheel that is driven to rotate;
Linked to rotation of a predetermined angle by the predetermined angle rotation means, and a link mechanism that separates or approaches the grinding device and the disk blade,
The link mechanism is configured such that the grinding device is spaced apart from or approaches the disk blade,
A frictional force is generated between the lever and the disk blade fixing base, and when the lever is rotated in the one direction, the disk blade fixing base is rotated by the frictional force, A disk blade grinding apparatus characterized in that the disk blade fixing base does not rotate in the reverse direction by an urging force exceeding the frictional force when rotated in the reverse direction. 2. The disk blade grinding device according to claim 1, wherein the grinding device is moved substantially linearly.

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