JP2011140090A - Mowing machine chip saw setting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic setting device capable of attaining enhancement of efficiency of setting work of a chip saw and stabilization of grinding quality by automating feeding of the chip saw and a grinder. <P>SOLUTION: The automatic setting device 10 includes: a power part 20 including a motor 21; a chip saw retaining part 70 for retaining the chip saw 1; any one of grinder parts of an upper blade grinder part 50 for grinding an upper blade of a chip 5 and a lower blade grinder part 60 for grinding a lower blade; a tooth feeding part 80 for feeding a predetermined number of teeth in every grinding of the chip saw 1; and a link mechanism 30 for driving the chip saw retaining part 70 and the grinder parts 50, 60. The link mechanism 30 moves the chip saw retaining part 70 such that the chip saw 1 is alternately moved to an upper blade grinding position and a lower blade grinding position and moves at least any one of the grinder parts 50, 60 to the corresponding grinding position in synchronous to the movement of the chip saw retaining part 70. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sharpening device that sharpens a tip saw of a mower, and more specifically to a tip saw automatic sharpening device that automatically sharpens and grinds the tip saw of a mower.

  Various types of tip saws for mowers are used, but in the present invention, a tip saw (also called a circular saw or a rotary saw) in which the periphery of a disk is formed in a saw shape and a tip is attached to each blade portion. , Simply called “chip saw”). An apparatus for mowing grass with such a tip saw is called a mower, lawn mower, brush cutter, etc. depending on its use. In this specification, a grass saw, grass, twig equipped with a tip saw of the type described above is used. Devices used for the purpose of mowing are collectively called mowers.

  FIG. 4 shows an outline of a tip saw for a mower that is sharpened by a tip saw automatic sharpening device (hereinafter also simply referred to as a “shaping device”) according to the present invention. The tip saw 1 is provided with a large number of saw-tooth teeth 2 around the entire circumference of a disk-shaped member. The center saw 3 is attached to a driving shaft of a mower (not shown) and is driven to rotate. Used to mow and twigs. The tip saw 1 is generally provided with a number of holes of various shapes for the purpose of weight reduction and cooling promotion as shown in the figure. As shown in the lower round frame in the figure, the teeth 2 are formed so as to protrude from the outer periphery of the tip saw 1, and a notch 4 is provided on the front surface in the rotational direction, and a tip 5 serving as a cutting edge is provided in the notch 4. Is marked low. The outer diameter of the tip saw 1 is 230 mm, 255 mm, 305 mm, etc., and the shape and number of teeth 2 are slightly different depending on the manufacturer.

  Of the chip 5, a substantially circumferential surface of the tip saw 1 indicated by a dashed line A in the figure and a substantially radial surface indicated by the alternate long and short dashed line B serve as cutting edges, and grass, twigs, etc. are cut on both surfaces. . In this specification, the cutting edge in the substantially circumferential direction indicated by the one-dot chain line A of the chip 5 is referred to as “top blade”, and the cutting edge in the substantially radial direction indicated by B is referred to as “belly blade”. Both cutting blades of the tip 5 are gradually worn out by use and become dull and the mowing ability is reduced. Therefore, the cutting blades need to be sharpened after a certain period of use. In the past, this sharpening operation was performed manually for each tooth using a disc grinder. However, this work requires skilled skills and is inefficient, and recently it has been known that this is performed by an apparatus (for example, see Patent Documents 1 and 2).

  According to Patent Document 1, the tip saw is pivotally mounted in only one direction, the disc grinder is set at the top blade grinding position of one tip 5, and when the one-tooth grinding is completed, the tip saw is manually rotated by one tooth. In the same manner, the next chip is ground and this is performed for all the chips. Next, the tip mounting position of the tip saw is changed, and the abdomen blade of each tip is similarly ground and rotated by one tooth. According to Patent Document 2, the tip saw is moved by pressing the tip saw against the fixed disc grinder and the top blade is ground by lever operation, and at the same time, one tooth of the tip saw is rotated during the lever operation. It is configured as follows. Only by this lever operation, the top blade grinding of all the tips of the tip saw is performed sequentially.

  In addition, the cutting edge regeneration processing of the tip saw is called variously such as “sharpening”, “polishing”, “grinding”, etc., but since the present invention uses a grinder, the processing itself is mainly “grinding” The term “sharpening” is mainly used for the apparatus and the work, and the term “sharp grinding” is mainly used for the operation, but there is no intention of making a clear difference in definition between them.

JP-A-9-155701 JP 2005-161408 A

  The tip saw sharpening device disclosed by the above-described prior art is improved to some extent in that it does not require skill for manual sharpening using a disc grinder, but there is still room for further improvement. First, according to the apparatus disclosed in Patent Document 1, it is necessary to manually feed one tooth at a time each time one chip is ground. Further, the grinding time for one tooth varies depending on the timing of manual one-tooth feeding, and it is difficult to ensure uniform grinding. Furthermore, when performing the abdomen blade grinding after the top blade grinding is completed, there is an inconvenience of removing the once-set tip saw, changing the axis attachment position, and resetting. Further, according to the apparatus described in Patent Document 2, even if each tooth can be fed at the time of lever operation, the grinding amount of each chip depends on the pressing force and pressing time of the lever and still depends on the operator's intuition. It must be a grinding operation. For this reason, the grinding amount tends to vary. In addition, Patent Document 2 does not mention anything about the grinding of the belly blade, so that it is not considered to perform the belly blade grinding with the device, and it is necessary to use another device. Seem.

  As described above, the present invention eliminates the problems in the above-described prior art apparatus, automates all the operations of feeding and grinding the tip saw by lever operation or direct hand, improving the efficiency of the sharpening work and stabilizing the sharpening quality. An object of the present invention is to provide an automatic sharpening device for a chip saw that can be realized.

  The present invention uses a driving source including a motor and a link mechanism that is connected to the driving source and transmits a driving force, and includes a sharpening grinder connected to the link mechanism and a tip saw holding portion on which the tip saw is mounted. The above-described problems are solved by providing an apparatus that can be synchronized and moved and can perform sharp grinding automatically, and specifically includes the following contents.

  That is, one aspect according to the present invention is an automatic sharpening device for sharpening and grinding either one or both of the top and / or belly blades of a tip saw, and includes a power unit including a motor and a tip saw mounted on the tip saw. At least one of a tip saw holding portion that can be held, a top blade grinder portion that includes a grinder for sharpening the top blade of each tip saw tooth, and a belly blade grinder portion that includes a grinder for sharpening the belly blade One grinder, a tooth feeding portion that feeds a predetermined number of teeth for each tooth grinding by the tip saw held by the tip saw holding portion, the tip saw holding portion driven by the power portion, and at least one of the grinders A link mechanism that drives the tip saw holding section and the small amount of the link mechanism for sharp grinding. At least one of the grinder parts is synchronized and moved to a grinding position where the tip saw and the grinder face each other, and when the sharpening of one tooth of the tip saw is completed, the tip saw holding part and at least one of the grinder parts are ground. The present invention relates to an automatic sharpening device that is driven so as to be retracted from a position.

  When the grinder part of the automatic sharpening device includes both a top blade grinder part and a belly blade grinder part, the link mechanism is configured to cause the tip saw to move alternately between the top blade grinding position and the belly blade grinding position. The holding part is moved, and when the tip saw moves to the top blade grinding position in synchronization therewith, the top blade grinder is moved to the top blade grinding position, and when the tip saw is moved to the belly blade grinding position, the stomach blade grinder is moved to the belly blade. The top and bottom grinders may be alternately moved to the grinding position, and the top and bottom blade grinders may be alternately moved to the retreat position.

  The tooth feed part includes a feed lever that is sequentially inserted into one tooth trough for each reciprocating movement of the tip saw moved by the movement of the tip saw holding part, and the movement of the tip saw teeth against the movement of the tip saw holding part. The tip saw itself is rotated by restraining it with the feed lever, and a predetermined number of teeth can be fed. At this time, when the automatic sharpening device includes a stomach blade grinder portion, the feed lever of the tooth feeding portion is a tooth that is ground by the stomach blade grinder portion when the tip saw moves to the stomach blade grinding position. It can be configured to be inserted into the trough of the tooth and to position the tooth tip in the abdomen blade grinding position. Thereby, it is possible to eliminate the variation in feeding due to the machining error of the teeth of the tip saw, and it is possible to uniformly sharpen the abdomen blade of the tip of each tooth.

  When the automatic sharpening device is provided with a top blade grinder, the top blade grinder is moved along the longitudinal axis while the top blade grinder is in the top blade grinding position, and the top of the rotary grinder of the top blade grinder is It can comprise so that the contact position which hits a blade may be changed. Thereby, uneven wear of the rotating grindstone can be prevented, and the life of the rotating grindstone can be extended.

  The automatic sharpening device comprises: adjusting the burr angle at the time of chip grinding by rotation around the longitudinal axis of the grinder part; adjusting the longitudinal position of the grinder part by using an adjustment screw; and chip grinding part by using another adjustment screw It is possible to include a mechanism that enables adjustment of at least one of the adjustments of the inclination angle of the grinder part with respect to the length direction.

  A long hole is provided in the table drive link for rotationally driving the rotary lever that moves the tip saw holding portion of the link mechanism, and a drive pin provided at one end of the rotary lever is slidably disposed in the long hole. Thus, even when the motor of the power unit is continuously rotated, the tip saw can be stopped at the grinding position for a certain period of time by sliding the drive pin in the elongated hole.

  An inclination angle is provided between the longitudinal axis of the abdominal blade grinder and the moving direction of the grinder mounting tool for mounting the abdominal blade grinder in a plane parallel to the flat surface of the tip saw attached to the tip saw holding portion. By doing so, the stomach blade grinder can be configured to approach at an inclined angle facing the stomach blade of the tip saw at the stomach blade grinding position. Thereby, the malfunction by the bite when a stomach blade grinder approaches a stomach blade can be eliminated.

  With the implementation of the tip saw sharpening device for mowers, it is possible to perform tipping of either or both of the top and / or belly blades of the tip saw in a fully automatic manner, making the sharpening work more efficient, Variation in the setting for each blade is eliminated, and uniform and high-quality setting is possible.

It is a top view which shows the chip saw automatic dressing apparatus which concerns on embodiment of this invention. It is a top view which shows one state (top dead center) of operation | movement of the automatic sharpening apparatus shown in FIG. It is a top view which shows another state (bottom dead center) of operation | movement of the automatic sharpening apparatus shown in FIG. It is the perspective view and partial enlarged perspective view which show the outline | summary of a chip saw.

  A chip saw automatic sharpening device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view of a chip saw automatic sharpening device 10 (hereinafter also simply referred to as “shaping device”) according to the present embodiment. A sharpening device 10 according to the present invention includes a drive unit 20 including a motor 21, a link mechanism 30 coupled to the drive unit 20, and a top blade grinder mounted with a top blade grinder 51 via the link mechanism 30 and driven to reciprocate. A bellows blade grinder driving unit 60 mounted with the driving unit 50 and the belly blade grinder 61 and reciprocatingly driven, a tip saw holding table 70 on which the sharpened tip saw 1 is mounted and driven to rotate, and further, the tip saw 1 is ground. The tooth feeding unit 80 is configured to feed one blade (or a plurality of blades) each time. The tip saw 1 that is sharpened by the sharpening device 10 may be a so-called ordinary circular saw in which the teeth 2 themselves have a cutting edge instead of the tip 5 in addition to the type shown in FIG.

  The drive unit 20 includes a motor 21 and a drive arm 22 fixed to the rotation shaft of the motor 21. As the motor 21 rotates, the driving arm 22 rotates as indicated by an arrow R, and each driven element is driven by operating a link mechanism 30 rotatably connected to the driving arm 22. One end of a table drive link 31 that is an element of the link mechanism 30 is rotatably coupled to the drive arm 22. A long hole 32 is provided at the other end of the table drive link 31, and a drive pin 72 fixed to a rotation lever 71 extending from the tip saw holding table 70 is fitted in the long hole 32. The drive pin 72 is slidable within the elongated hole 32 of the table drive link 31. The rotation lever 71 is provided with a mounting plate 73 on which the tip saw 1 is rotatably mounted. The mounting plate 73 is rotatably supported by a fulcrum pin 74 on the opposite side of the driving pin 72 with respect to the mounting plate 73. Therefore, by the operation of the table drive link 31, the rotation lever 71 rotates about the fulcrum pin 74, and the tip saw 1 mounted on the rotation lever 71 also swings to the left and right in the drawing. The mounting plate 73 is provided with an adjustable brake 76 for braking free rotation.

  A bracket 33 is provided near the center of the table drive link 31, and one end of a connecting link 34 is rotatably attached to the bracket 33. The other end of the connecting link 34 is rotatably attached to one end of the intermediate drive arm 36. The intermediate drive arm 36 is rotatably attached to the support column 37, and a top blade grinder drive arm 38 and a belly blade grinder drive arm 39 extend from the intermediate drive arm 36. In the figure, each drive arm 36, 38, 39 is drawn in a plane so as to extend in a trifurcated manner, but even if a step is provided in a direction perpendicular to the drawing in order to avoid interference between related links. Good. Each of the drive arms 36, 38, 39 rotates integrally around the support column 37.

  One end of a top blade grinder drive link 41 is rotatably attached to the top blade grinder drive arm 38, and the other end of the link 41 is connected to a grinder mounting tool 52 of the top blade grinder drive unit 50 via an adjustment tool 53. Is fixed. The adjuster 53 is configured so as to be pivotable in order to cope with angular fluctuations during driving. A belt-shaped grinder fixture 54 is attached to the grinder mounting tool 52, and the top blade grinder 51 is caught by the grinder fixture 54 and is fixed so as to be adjustable and rotatable about the longitudinal axis. In the example shown in the figure, the grinder mounting tool 52 is formed from an angle material with a cross-section “L” shape, and is mounted on a base plate 56 made of an angle material with a cross-section “L” shape in the longitudinal direction. It is possible to move the slide. As the top blade grinder 51, a commercially available disc grinder of a type that rotates a normal disc-shaped grindstone can be used. A rotating grindstone (grinder disk) 58 is attached to be rotatable about an axis parallel to the drawing.

  Similarly, one end of a stomach blade grinder drive link 42 is rotatably attached to the stomach blade grinder drive arm 39, and the other end of the link 42 is attached to the grinder mounting tool 62 of the stomach blade grinder drive unit 60. It is fixed through. The adjustment tool 63 is configured to be pivotable. A belt-shaped grinder fixing tool 64 is attached to the grinder mounting tool 62, and the abdominal blade grinder 61 is caught by the grinder fixing tool 64 and is fixed so as to be rotatable and adjustable about the longitudinal axis. The grinder mounting tool 62 is made of an angle material, and can be slid in the longitudinal direction by being mounted on a base plate 66 made of the same angle material. Note that, unlike the top blade grinder driving unit 50, the belly blade grinder driving unit 60 is provided with an inclination of an angle θ in the plan view of the figure between the longitudinal axis of the belly blade grinder 61 and the grinder mounting tool 62. . This will be described later. A rotating grindstone (grinder disk) 68 is attached so as to be rotatable about an axis parallel to the drawing.

  The tooth feeding portion 80 is composed of a feed lever 81 rotatably attached to a fulcrum extending from the base of the device 10 (not shown), and the feed lever 81 is always urged in a direction toward the tip saw 1 by a spring 82. The free end side of the feed lever 81 is bent in a “h” shape, the tip of the feed lever 81 enters the valley of each tooth of the tip saw 1, and when the tip saw 1 moves to the left in the figure, the tip is a spring 82. When the tip saw 1 moves to the right in the figure, the tip saw 1 itself is rotated by pushing the teeth of the tip saw 1 at the tip. It is configured to feed one tooth or multiple blades. That is, the tooth feed unit 80 is configured to feed the teeth by rotating the tip saw 1 by pressing the teeth when the tip saw 1 moves closer, instead of operating itself to feed the teeth of the tip saw 1. ing.

  The operation of the tip saw automatic sharpening device 10 according to the present invention configured as described above will be described with reference to FIGS. FIG. 2 shows a state in which the drive arm 22 is positioned in the left direction in the figure due to the rotation of the motor 21, and is aligned with the table drive link 31 of the link mechanism 30 so that the table drive link 31 moves in the leftmost direction in the figure. ing. In this specification, this state is temporarily called “top dead center”. In the state of the top dead center and the state up to the top dead center, first, the table drive link 31 moves to the leftmost side. As a result, the drive pin 72 of the tip saw rotation lever 71 fitted in the long hole 32 of the table drive link 31 The rotary lever 71 mounted with the tip saw 1 rotates counterclockwise around the fulcrum pin 74 as a result of being pressed against the proximal end (right end in the figure) of the long hole 32. Is pushed out toward the grinding position of the top edge grinder 51 located in the leftmost direction in the figure.

  As a result of the tip saw 1 turning to the left in the drawing, the feed lever 81 of the tooth feed portion 80 attached to the base of the apparatus 10 slides on the tooth crest of the tip saw 1 and then the adjacent next by the action of the spring 82. It falls into the trough of the tooth (the next adjacent tooth in the case of double feed).

  Next, as the table drive link 31 moves leftward, the connecting link 34 is pushed leftward via the bracket 33. As a result, the connecting link 34 pushes the intermediate drive arm 36 leftward, and the intermediate drive arm 36 is supported by the column. Rotate counterclockwise around 37. Due to the rotation of the intermediate drive arm 36, the top blade grinder drive arm 38 and the abdominal blade grinder drive arm 39 formed integrally therewith also rotate counterclockwise around the support column 37 at the same time. As a result, the top blade grinder drive arm 38 first pulls the top blade grinder drive link 41 substantially downward in the drawing. By this movement, the grinder mounting tool 52 of the top grinder driving unit 50 coupled to the top grinder driving link 41 is moved substantially downward in the figure, and the top grinder 51 mounted on the grinder mounting tool 52 is ground downward. The top edge of the tip of the tip saw 1 that has just moved to the position is ground by the grinder 58. On the other hand, the rotation of the stomach blade grinder drive arm 39 that rotates simultaneously pushes the stomach blade grinder drive link 42 connected thereto substantially to the upper right side of the figure. As a result, the grinder mounting tool 62 coupled to the drive link 42 is also pushed almost to the upper right side, and the mounted stomach blade grinder 61 is moved away from the tip saw. As a result, the stomach blade grinder 61 is retracted from the grinding position. It becomes.

  As described above, in the state shown in FIG. 2, the tip saw 1 moves to the grinding position of the top blade grinder 51, and the top blade grinder 51 also moves to a position facing this, so that the tip 5 aligned at the facing position is moved. The top blade (shown by reference A in FIG. 4) is sharply ground by the rotating grindstone 58 of the top blade grinder 51. During this time, the abdominal blade grinder 61 is in the retracted position, and the feed lever 81 of the tooth feed section 80 is in the state of moving to the next tooth. In order to suppress vibration during grinding when the tip saw 1 is moved, a vibration suppressor 77 that sandwiches the tip saw 1 from both sides with a slight load is disposed so as to sandwich the tip saw 1.

  When the motor 21 further rotates from the position of “top dead center” shown in FIG. 2 and the drive arm 22 moves in the direction indicated by the arrow R in the figure, the link mechanism 30 moves in the opposite direction from what has been described so far. To start. The only exception is the movement of the tip saw 1. The drive pin 72 of the rotary lever 71 that drives the tip saw 1 is fitted in the long hole 32 of the table drive link 31. Therefore, even if the table drive link 31 starts to move in the right direction, the drive pin 72 only slides in the long hole 32 and does not move. The rotating lever 71 does not rotate until it abuts the side. As a result, the tip saw 1 becomes stationary, and during this time, the tip saw 1 stays at a position facing the top blade grinder 51, and the state in which the top blade is ground is maintained. During this period, the top blade grinder 51 moves slightly upward in the figure by the movement of the top blade grinder drive arm 38 → the top blade grinder drive link 41 → the grinder mounting tool 52. This movement produces one feature of the present invention. That is, the tip saw 1 is stationary, and the top blade grinder 41 moves substantially upward in the figure along the top blade while grinding one tip top blade, so that the grinding position of the rotating grindstone 58 shifts, Produces the effect of avoiding uneven wear. In the prior arts such as the devices shown in Patent Documents 1 and 2, since only the tip saw is pressed toward the stationary grinder, the position where the rotating grindstone hits is always constant, and only the grindstone at that location is unevenly worn. Was produced.

  Next, FIG. 3 shows a state in which the motor 21 further rotates and the drive arm 22 moves to the right side of the drawing and is aligned with the table drive link 31. At this time, the table drive link 31 is pulled to the rightmost position in the figure, and in this specification, this state is temporarily called “bottom dead center”. The state of the bottom dead center and the operation up to the bottom dead center are basically the reverse of the state described with reference to FIG. That is, first, the table drive ring 31 moves to the rightmost side in the figure, and the drive pin 72 of the tip saw rotating lever 71 that has entered the long hole 32 of the table drive link 31 contacts the remote end side (left end in the figure) of the long hole 32. It is in a state of being touched and drawn to the right in the figure. As a result, the rotary lever 71 on which the tip saw 1 is mounted rotates clockwise about the fulcrum pin 74, and the tip saw 1 moves in a substantially right direction in the figure.

  When the tip saw 1 moves substantially to the right in the figure, the feed lever 81 of the tooth feed mechanism 80 that has fallen into the tooth valley of the tip saw 1 moves the teeth of the tip saw 1 that is about to move to the right. In order to prevent this, the tip saw 1 itself rotates around the mounting position 75 of the mounting plate 73, and one tooth (or a plurality of blades) is sent counterclockwise in the figure. As a result, the next blade is positioned at the grinding position in place of the blade ground by the previous operation. Whether the tooth feed is to be single-tooth feed or multiple-tooth feed (for example, two teeth) can be determined depending on the moving stroke of the mounting plate 73 on which the tip saw 1 is mounted.

  Next, the rightward movement of the table drive link 31 causes the connecting link 34 to move to the right side via the bracket 33. As a result, the intermediate drive arm 36 connected thereto rotates clockwise around the column 37, and at the same time The top blade grinder drive arm 38 and the abdominal blade grinder drive arm 39 formed integrally therewith also rotate clockwise. As a result, first, the top blade grinder drive arm 38 pushes up the top blade grinder drive link 41 substantially upward in the drawing, and this movement moves the grinder mounting tool 52 substantially upward in the drawing. As a result, the top blade grinder 51 is moved upward in the drawing. Move to. As a result, the top blade grinder 51 moves away from the grinding position of the tip saw 1 and retreats to the retracted position.

  On the other hand, the clockwise rotation of the stomach blade grinder drive arm 39 that rotates at the same time pulls the stomach blade grinder drive link 42 connected thereto substantially to the lower left side of the figure, whereby the grinder mounting tool 62 is also substantially lower left. As a result of being pulled to the side, the abdomen blade grinder 61 moves to a sharpening position facing the new blade to which one tooth of the tip saw 1 is fed, and this is sharpened by the rotating grindstone 68.

  As described above, in the state shown in FIG. 3, the tip saw 1 moves to the grinding position of the stomach blade grinder 61 and the stomach blade grinder 61 also moves to a position opposite to this, so that the tooth tips aligned with the facing position are obtained. Five belly blades are sharply ground by the belly blade grinder 61. During this time, the top blade grinder 51 is in the retracted position, and the feed lever 81 of the one-tooth feed mechanism 80 is in a state where one tooth of the tip saw 1 is fed.

  Here, the feature of the present invention is included in the movement of the stomach blade grinder 61. In FIG. 3, an inclination of an angle θ is provided between the abdominal blade grinder 61 and the grinder mounting tool 62 on which the abdominal blade grinder 61 is viewed in plan view. For this reason, when the grinder mounting tool 62 moves toward the tip saw 1, the rotating grindstone 68 of the stomach blade grinder 62 approaches and contacts the tip 5 at an inclined angle while facing the stomach blade of the tip 5 in parallel. . If this inclination is not provided, since the rotating grindstone of the stomach blade grinder 62 approaches directly from the lateral direction along the stomach blade of the tip 5 to be ground, there is an extremely high risk that the rotating grindstone will bite into the tip 5. . According to the configuration of the present invention, it is configured to be able to avoid unexpected collision between the tip and the grindstone and grinding abnormality by approaching and grinding obliquely while facing the front of the abdomen blade in parallel. Yes. In the case of the top blade grinder 51, since it approaches the tangential direction with the top blade of the chip 5, there is little risk of such a grindstone biting in, but if necessary, it is similarly inclined. Of course, it is also possible to configure.

  When the motor 21 further rotates from the position of “bottom dead center” shown in FIG. 3 and the drive arm 22 further rotates in the direction indicated by the arrow R in the figure, the link mechanism 30 moves again in the opposite direction from what has been described so far. Start moving towards. The only exception here is the movement of the tip saw 1. Since the drive pin 72 of the rotary lever 71 that drives the tip saw 1 is fitted in the long hole 32 of the table drive link 31, the drive pin 72 is a long hole even if the movement toward the left direction of the table drive link 31 is started. The slide lever 71 does not rotate for a while only by sliding in the position 32. Therefore, the tip saw 1 is in a stationary state, and during this time, the state in which the belly blade of the tip 5 is ground by the belly blade grinder 61 is maintained.

  As described above, the operation is alternately continued by the driving force of the motor 21 of the driving unit 20 between the states shown in FIG. 2 and FIG. When the tip saw 1 is rotated once and the sharp grinding of all the teeth is completed, the sharpening of one tip saw 1 is completed. During this time, the operator simply attaches the tip saw 1 to the mounting plate 73 and switches on the power source. After that, all operations are automatically performed until completion, which is extremely efficient.

  Up to now, the configuration and operation of the tip saw sharpening device according to the embodiment of the present invention have been described, as well as some features. Here, the configuration and features other than those described so far with respect to the dressing device according to the present invention will be supplementarily described. First, the grinders 51 and 61 for the top blade and the abdomen blade are held and fixed by the grinder fixtures 54 and 64, respectively. In this fixing, the grinders 51 and 61 are centered on the longitudinal axis as described above. Can be rotated. For this reason, by adjusting the shaft angles of the grinders 51 and 61 once by loosening the fixtures 54 and 64, it is possible to adjust the angle at which the chip top blade and the abdominal blade are ground (bald angle). In particular, when used for the purpose of mainly cutting twigs using the top blade of the tip saw 1, the top angle of the top blade (in this specification, the top blade and the belly blade of the tip saw with respect to the rotation axis in the rotation axis direction of the tip saw). In some cases, the angle of inclination is referred to as a “vertical angle”). According to the dressing device according to the present embodiment, the tooth feeding unit 80 is set to feed two teeth, and the top edge of the entire circumference is first sharpened and ground at the first burr angle every other tooth. The blade grinder 51 can be rotated around the longitudinal axis, set to the second bald angle where the burr angle is reversed, and the remaining top edge every other tooth is sharply ground. it can.

  Although not shown in the drawings, an adjustment screw is provided at a portion where each grinder 51, 61 is mounted on each grinder mounting tool 52, 62, so that the plane view shown in FIGS. Thus, the mounting angle of the grinders 51 and 61 (the angle with respect to the tip saw 1 on the plan view) can be adjusted. Further, by using the illustrated adjusting tools 53 and 63, it is possible to adjust the stroke position of the grinder that is in contact with the sharpened chip. By these adjustments, it is possible to sharpen and grind even a tip saw with a somewhat different specification using the same apparatus.

  In particular, stroke adjustment of the abdominal blade grinder 61 using the adjustment tool 63 is useful. As shown in the round frame of FIG. 4, the tip 5 is brazed to the notch 4 of the tooth portion 2 of the tip saw 1. The position of the notch 4 and the length of the tip 5 vary depending on the tip saw manufacturer. is there. If the grindstone of the abdominal blade grinder 61 is cut not only to the tip 5 but also to the tooth 2 beyond the tip 5, the grindstone is damaged, the notch 4 is damaged, or the heat of the notch is generated due to the heat generated by the notch processing The brazing may melt and fall off. In conventional manual grinding, such problems are very likely to occur. For this reason, skillful arms are required. However, according to the apparatus of the present invention, such problems can be easily eliminated by the adjustment as described above. it can.

  Further, the tooth feeder 80 of the sharpening device according to the embodiment of the present invention has a great feature that it is possible to avoid variations in processing during manufacture of the teeth of the tip saw 1. Basically, the plurality of teeth provided on the tip saw 1 are evenly distributed on the outer periphery. However, in actual machining, there are cases in which the outer periphery is indexed and machined one tooth at a time. In such a case, machining is started from one tooth and all teeth (for example, a conventional chip saw having a diameter of 255 mm) When the number of teeth is 30 to 35), machining errors are accumulated in the teeth at the final position, so that the size of the last tooth may differ from the size of the other teeth. Alternatively, other factors may cause variations in dimensions among the teeth. The error at this time is easily considered to be much larger than the amount of grinding particularly when grinding the stomach blade. At this time, for example, in a tooth feeding method using a tooth different from the tooth to be sharpened as shown in Patent Document 1 as a reference for tooth feeding, uniform grinding of each blade is expected due to such an error. It will be difficult. Alternatively, when the feed amount is insufficient, for example, a situation may occur in which the stomach blade grinder bites into the tip and causes a problem. On the other hand, according to the present invention, the feed lever 81 of the tooth feed mechanism 80 has its own teeth on which the tip to be grinded facing the rotating grindstone 68 of the stomach blade grinder 61 is attached as shown in FIG. Since it is used as a reference for feeding, even if the tip saw includes a processing error as described above, all the tips can be uniformly sharpened without any trouble.

  The tip saw automatic sharpening device according to the present invention has been described above, but the present invention is not limited to that shown in the above embodiment, and various modifications are possible. For example, in the example shown in FIGS. 1 to 3, both the top blade grinder 51 and the belly blade grinder 61 are provided, and both the top blade and the belly blade are sharply ground. If these two blade surfaces can be automatically ground at the same time, it is more efficient. However, only the top blade grinder or only the abdominal blade grinder may be provided to perform only one of the grinding operations. Further, in the illustrated example, the top blade grinder 51 is stroked along its longitudinal axis, and the abdominal blade grinder 61 is configured to stroke at an angle θ and inclined to the longitudinal axis. It may be reversed, or both may be stroked with no inclination, or both may be stroked with inclination.

  According to the experiment by the test apparatus conducted by the present inventor, the manual operation of the tip saw that has been performed manually or by a simple apparatus can be performed in an extremely short time, efficiently and easily. There is a marked difference in the quality of the finished product compared to the prior art. Since it is possible to regenerate wonderfully the one that had to be discarded with the tip saw so far, it can also contribute from the viewpoint of economy and ecology. In particular, in the case of consigning a conspicuous work as a business using the apparatus according to the present invention, it is expected that the quality, delivery time, and cost will be greatly improved, and it will be accepted by customers with good feeling.

  INDUSTRIAL APPLICABILITY The tip saw automatic sharpening device according to the present invention can be widely used in the industrial fields of manufacturing, sales and contract processing of agricultural machinery and horticultural machinery.

1. Chip saw, 2. Teeth, 5. Chip, 10. 21. Chip saw automatic sharpening device Drive unit, 21. Motor, 22. Drive arm, 30. Link mechanism, 31. Table drive link, 36. Intermediate drive arm, 38. Top blade grinder drive arm, 39. 50. Abdominal blade grinder drive arm; 51. Top blade grinder drive unit Top blade grinder, 60. 61. Abdominal blade grinder drive unit 70. Abdominal blade grinder; Chip saw holding table 71. Rotating lever, 80. Tooth feeding part, 81. Feed lever.

Claims (8)

An automatic sharpening device for sharpening and grinding one or both of the top and / or belly blades of a tip saw,
A power unit including a motor;
A tip saw holding section that holds the tip saw and holds it rotatably;
A grinder portion with at least one of a top blade grinder portion provided with a grinder for sharpening the top blade of each tip saw, and a bellow blade grinder portion with a grinder for sharpening the belly blade,
A tooth feeding part that feeds a predetermined number of teeth for each tooth grinding of the chip saw held in the chip saw holding part;
Driven by the power unit, the tip saw holding unit, and a link mechanism that drives the at least one grinder unit,
The link mechanism synchronizes the tip saw holding portion and at least one of the grinder portions for sharp grinding, and moves the tip saw and the grinder to a facing grinding position. An automatic sharpening device, wherein the tip saw holding portion and at least one of the grinder portions are driven to retract from the grinding position. The automatic sharpening device comprises both a top blade grinder part and a belly blade grinder part,
The link mechanism moves the tip saw holding portion so that the tip saw moves alternately between the top blade grinding position and the belly blade grinding position, and when the tip saw moves to the top blade grinding position in synchronization with this, the top saw moves. When the blade grinder portion is moved to the top blade grinding position and the blade cutting position, the blade blade grinder portion is alternately moved to the blade cutting position, and otherwise, the top blade grinder portion and the blade cutting grinder portion are moved. The automatic sharpening device according to claim 1, wherein the automatic sharpening device is configured to move each of them alternately to the retracted position.   The tooth feed portion includes a feed lever that is sequentially inserted into a valley of one tooth of the tip saw every time the tip saw moves by the movement of the tip saw holding portion, and the teeth of the tip saw are opposed to the movement of the tip saw holding portion. The automatic sharpening device according to claim 1, wherein the tip saw itself is rotated by restraining movement of the tip by the feed lever to feed a predetermined number of teeth. The automatic sharpening device comprises at least a stomach blade grinder,
The feed lever of the tooth feeding part is configured to be inserted into a trough of a tooth to be ground by the stomach blade grinder part when the tip saw moves to the stomach blade grinding position to position the tooth at the stomach blade grinding position. The automatic sharpening device according to claim 3. The automatic sharpening device comprises at least a stomach blade grinder,
The grinder of the said stomach blade grinder part is comprised so that it may approach at an angle inclined with respect to the stomach blade, and it may contact | abut in the stomach blade grinding position, facing parallel to the stomach blade of a chip saw. Automatic sharpening device.   Of the link mechanism, a long hole is provided in a table drive link for rotationally driving a rotary lever that moves the tip saw holding portion, and a drive pin provided at one end of the rotary lever is slidably disposed in the long hole. 2. The automatic sharpening device according to claim 1, wherein the tip saw is stationary at a grinding position for a predetermined time by sliding the drive pin in the elongated hole even by continuous rotation of the motor of the power unit. The automatic sharpening device comprises at least a top blade grinder part,
The top blade grinder portion moves along its longitudinal axis while the tip saw is stationary at the grinding position at the top blade grinding position, thereby changing the contact position of the top blade grinder portion with the grinder. The automatic sharpening device described. Adjusting the burr angle during chip grinding by rotating the grinder around the longitudinal axis, adjusting the longitudinal position of the grinder by using an adjustment screw, and using the other adjustment screw The automatic sharpening device according to claim 1, further comprising an adjustment mechanism that enables at least one of adjustment of an inclination angle of the portion.