JPH08281514A - Tooth back line altering device in saw polishing machine - Google Patents

Abstract

PURPOSE: To always select the most suitable tooth back line shape to various material being different in hardness and structure by providing the rotation center of a lever for vertically moving a polishing head so as to be adjustable in movement. CONSTITUTION: When a tooth back line altering device is rotated by a handle, an elevating body is moved by the rotation of a feed screw to move the roller of a supporting point member, and a contact point between the roller and a rod 28, namely a supporting point position, is optionally converted from a base point coinciding with the horizontal center line of a connecting shaft 27 between the rod 28 and a crank 26 toward a lower side. Since as the converted value of the supporting point position is enlarged, an angle at which the crank 26 is rotated by the rod 28 increases, and an eccentric axis is raised higher than a reference position, the pushing up of a polishing head 3 carried out by an L-shaped lever 13 is enlarged as much as conversion value, and a rising rate in the grinding of the tooth back line of a back rise mold is thereby made larger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device capable of freely changing the shape of a tooth back line from a straight line to a variety of back laying types having different elevations in saw tooth polishing.

[0002]

2. Description of the Related Art Conventionally, a plurality of auxiliary levers are attached to a main lever connected to a polishing head, these auxiliary levers are selected by engagement of a fulcrum member, and the selected auxiliary levers are driven by a cam to move the movements. By transmitting to the main lever, multiple cams are selected to change the operating state of the polishing head, and the engagement position of the fulcrum member with respect to the sub lever is changed to freely change the swing process of the sub lever and main lever. A saw polishing device that can be used is the invention of the present inventor.
This device is known from Japanese Patent Application Publication No. JP-A-2003-138, and has a feature that a tooth back line of a saw tooth can be ground into a straight line and a back-up type by one machine.

However, since the above-mentioned device changes the engaging position of the fulcrum member with respect to the sub-lever to increase or decrease the swinging process of the sub-lever and the main lever, this adjustment arbitrarily changes the tooth height of the saw tooth. However, since it is not possible to change and adjust the degree of elevation of the back-entry tooth type, the tooth back line may be changed to a straight line or a back-entry type with a different degree of elevation, depending on the hardness or softness of the material or the tissue. In the lumber industry that needs to change and always perform sawing with maximum efficiency, the emergence of a device that can freely change the tooth back line is strongly desired.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the present circumstances, and the movement center of a lever for raising and lowering a polishing head is adjusted in accordance with a saw feed to push up the polishing head by the lever. The shape of the tooth back line of the sawtooth can be freely changed from a straight line to a backing type with a different degree of elevation by changing the Provided is a tooth backline changing device in a saw polishing machine which can select a shape.

[0005]

In order to solve the above-mentioned problems, a tooth back line changing device in a saw grinding machine according to the present invention comprises a polishing head which supports a rotary grindstone and is moved up and down by an elevating means, and reciprocating means by a reciprocating means. In the saw-tooth grinder provided with a saw feed member that feeds saw teeth to the grinding position by the rotating grindstone, the raising and lowering means of the polishing head is a lever drive type by a cam, and the rotation center of the lever is rotated by a support shaft. It is supported by an eccentric shaft that is displaced upward, and a crank is attached to the support shaft so that a cam that operates synchronously with the lifting cam of the polishing head acts on one side of the rod, and an adjusting means on the other side. A structure in which a fulcrum member whose movement is adjusted is engaged is adopted.

[0006]

In the tooth back line changing device in the saw grinder having the above-described structure, when the fulcrum member is positioned so that the contact point with the rod is on the horizontal center line of the connecting shaft between the rod and the crank as shown in FIG. 2 does not act on the crank even when the rod is driven by the cam to rotate from the position shown by the solid line in FIG. 2 to the position shown by the chain line, the crank remains stationary as shown in FIG. The eccentric pin is held at the reference position without rotating. Therefore, the lever driven by the lifting cam of the polishing head rotates about the eccentric shaft at the reference position as shown in FIG. 6, so that the cam raises the polishing head at a constant speed in this case. If you design and place it,
The sawteeth sent out by the sawing means are shown in FIG.
It is ground straight as shown in a.

However, when the fulcrum member is lowered by operating the adjusting means to move the contact point with the rod below the horizontal center line of the connecting shaft between the crank and the rod as shown in FIG. Since this fulcrum member gives a fulcrum, when the cam is driven as shown by the chain line, the upper side of the fulcrum member rotates in the opposite direction as shown in FIG. 3, and the crank is shown by the chain line from the position shown by the solid line. The eccentric shaft is gradually moved upward from the reference position shown by the solid line to the position shown by the chain line to rotate the support shaft to the position and then return to the reference position as the rod returns to its original position. The larger the amount of increase is, the more the rising speed of the polishing head by the lever is increased. Therefore, the above-mentioned constant speed increase of the polishing head is gradually increased, and then converted into a non-constant speed increasing operation which is gradually reduced. , Hase sawtooth 9 sent to the saw unit 9
b is ground to a back-groove type in which the middle thereof rises. In this back-groove type grinding, the speed difference of the non-uniform velocity motion increases as the movement amount of the rotation center of the lever increases. Therefore, the amount of protrusion of the tooth back line to be ground increases, and the shape of the tooth back line is variously changed as shown in FIGS. 9b, 9c, 10a, 10b, and 10c.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tooth back line changing device in a saw tooth polishing machine according to the present invention will be described below with reference to the drawings.

FIG. 1 is an overall front view showing an embodiment of a saw-tooth grinder adopting a tooth back line changing device according to the present invention, and FIG. 2 shows a state in which a tooth back line of a saw tooth is linearly ground according to the above embodiment. FIG. 2 is a front view of a part of the essential part shown in a vertical section, FIG. 2 is a front view of the essential part showing a state in which a tooth back line of a saw tooth is ground in a back-up type according to the same embodiment, and FIG. FIG. 5 is a vertical cross-sectional side view showing the structure of an elevating lever and means for adjusting the rotation center of the lever. FIG. 5 shows the structure of means for adjusting the rotation center of the polishing head elevating lever in the embodiment. FIG. 6 is an explanatory view of a state in which the polishing head elevating lever in the above embodiment is driven by a cam with its rotation center at a reference position. FIG. 7 is an explanatory view of a state in which the raising / lowering lever of the polishing head in the above-described embodiment moves the center of rotation thereof to a position higher than the reference position and is driven by the cam. FIG. 8 is a rear view showing the structure of the saw feed cam, the polishing head raising / lowering cam, and the structure of the cam for moving and adjusting the rotation center of the polishing head raising / lowering lever, and their mutual relational positions in the embodiment. 9
FIG. 3 is a side view showing each example of a tooth back line of a saw tooth polished by the same embodiment. FIG. 10 is a side view showing another example of the tooth back line of the saw tooth polished according to the above embodiment.

In FIG. 1, reference numeral 1 indicates a body of a saw-tooth grinder, which is usually formed in a box shape, and an inclined guide 2 is provided on one side of an upper surface thereof, and the inclined guide 2 is moved up and down by an elevating means A. The polishing head 3 supported by the polishing head 3 is supported by a rotary grindstone 5 driven by a motor 4, and a holder 6 is provided on the other side of the upper surface. A saw blade member 7 which is reciprocated to the left and right is attached to a shaft 8, and the lower portion of the saw blade member 7 is engaged with a tooth throat 9a of a saw tooth 9 shown in FIGS. 9 and 10 to feed it out and slide on a tooth back 9b. The remittance 10 that returns to the original position is attached.

As shown in FIGS. 6 and 7, the raising / lowering means A of the polishing head 3 is a cam 12 fixed to a cam shaft 11.
And an L-shaped lever 13 whose center of rotation is supported by an eccentric shaft described later. A roller 14 provided at one end of the L-shaped lever 13 is brought into contact with the cam 12 so that the L-shaped lever 13 is rotated. The other end is attached to the polishing head 3 by a rod 15.
By connecting to the passive arm 16 of
3 with the center of rotation S at the reference position, the cam 12
When the L-shaped lever 13 is rotated from the position shown by the solid line to the position shown by the chain line in FIG.
9 is raised at a constant speed with the feeding of the
The shape of the cam 12 is designed so as to grind to a straight line shown in a, and when the back of the tooth 9b is ground to the back-up type, the rotation center S of the lever 13 is moved upward by, for example, L as shown in FIG. By moving the lever and rotating the lever while moving the center of rotation, the ascending speed of the polishing head is increased by the amount of the movement of the center to give unequal speed motion.

The reciprocating means B of the saw blade member 7 is shown in FIG.
The cam 17 is fixed to the cam shaft 11 and an L-shaped lever 19 whose center of rotation is supported by the shaft 18 is provided. The roller 20 provided at one end of the L-shaped lever 19 is provided with the cam 17 described above. And the roller 21 provided at the other end is brought into contact with a passive arm 22 that is continuously provided at the lower part of the sawtooth member 7, and a return spring 23 is connected to the passive arm 22 so that the L-shaped cam 17 is provided. When the lever 19 is rotated, the saw blade member 7 is reciprocally moved to the left and right, and the saw blade 9 shown in FIGS.
Send out pitch by pitch.

3 to 8, reference numeral 24 is a support shaft of the L-shaped lever 13 for moving the polishing head 3 up and down, and an eccentric shaft 25, which is eccentric to the lower side from the center by a predetermined size, is provided on the end face of the support shaft. Since the center of rotation of the L-shaped lever 13 is fitted to the shaft 25, when the support shaft 24 is reciprocally rotated within a range of a rod and a crank described later, the eccentric shaft 25
Is gradually raised and then gradually lowered, and the L-shaped lever 13 is caused to perform a rotational movement accompanied by vertical movement of the rotational center S, and the L-shaped lever 13 raises and lowers the polishing head 3. Change.

2 to 5 and 8, reference numeral 26 is a crank attached to the lower side of the support shaft 24, a rod 28 is connected to the lower side of the crank by a connecting shaft 27, and is provided at the lower end of the rod 28. One side of the roller 29 is brought into contact with the moving cam 30 of the eccentric shaft 25 fixed to the cam shaft 11, and the other side surface of the rod 28 is lifted and lowered by a feed screw 31 as an adjusting means. When the feed screw 31 is brought into contact with the roller 34 of the fulcrum member attached to the shaft 33 and is rotated by the handle 37 which is connected to the feed screw 31 by the helical gears 35 and 36, the lifting screw 32 is moved by the rotation of the feed screw 31, The roller 34 of the fulcrum member is moved, and the contact point between the roller 34 and the rod 28, that is, the fulcrum position is arbitrarily moved downward from the base point that coincides with the horizontal center line of the connecting shaft 27 between the rod 28 and the crank 26. As it is capable of conversion, the larger the conversion value of the support position, the crank 26 by a rod 28
The angle at which the polishing head 3 is rotated increases, and the eccentric shaft 25 is raised above the reference position. Therefore, the pushing-up of the polishing head 3 by the L-shaped lever 13 increases by the conversion value. This is to increase the degree of protrusion in the grinding of the tooth back line.

2, 3 and 5, reference numeral 38 indicates a display ring which is integrally rotated with the handle 37.
A necessary number of scales 41 corresponding to the index 40 displayed on the bearing 39 of the handle 37 is displayed on the display ring 38, and the feed screw 31 of the adjusting means is rotated by the operation of the handle 37 to move and adjust the fulcrum member 34. , Saw tooth 9 back 9
When adjusting the degree of elevation of b, the desired scale 41 is the index 4
When the handle 37 is stopped in accordance with 0, the tooth back 9b of the sawteeth 9 is ground to the desired tooth back line.

[0016]

As described above, the tooth back line changing device in the saw tooth polishing machine according to the present invention changes the pushing-up mode of the polishing head by the lever only by moving and adjusting the rotation center of the lever for moving the polishing head up and down. The back profile of the saw tooth to be ground can be freely converted from a straight line to a variety of back profile types with different elevations, and the optimum back profile for various materials with different hardness and softness is always available. It has an epoch-making feature that it can be selected, and because it has a simple structure, it can be offered on the market at a low cost, and the adjustment operation for obtaining the desired tooth back profile line can be performed easily and quickly.

[Brief description of drawings]

FIG. 1 is an overall front view showing an example of a saw-tooth grinder adopting a tooth backline changing device according to the present invention.

FIG. 2 is a front view in which a part of a main part is longitudinally cut, showing a state in which a tooth back line of a saw tooth is linearly ground according to the embodiment.

FIG. 3 is a front view of an essential part showing a state in which a tooth back line of a saw tooth is ground in a back-up type according to the embodiment.

FIG. 4 is a vertical cross-sectional side view showing a configuration of a lifting / lowering lever of a polishing head and a means for moving and adjusting a rotation center of the lever in the embodiment.

FIG. 5 is a plan view showing the structure of means for moving and adjusting the rotation center of the polishing head elevating lever in the embodiment.

FIG. 6 is an explanatory diagram showing a state in which the raising / lowering lever of the polishing head in the above embodiment is driven by a cam with its rotation center at a reference position.

FIG. 7 is an explanatory diagram showing a state in which the raising / lowering lever of the polishing head in the embodiment is moved to a position above a reference position and driven by a cam.

FIG. 8 is a rear view showing the structure and relationship of a saw feed cam, a polishing head lifting cam, and a cam for moving a rotation center of a polishing head lifting lever in the embodiment.

FIG. 9 is a side view showing each example of a tooth back line of a saw tooth polished according to the example.

FIG. 10 is a side view showing each other example of the tooth back line of the saw tooth polished by the above-mentioned embodiment.

[Explanation of symbols]

 3 Polishing head A Elevating means 5 Rotating grindstone 7 Saw feed member B Reciprocating means 12 Cam 13 L-shaped lever 24 Support shaft 25 Eccentric shaft 26 Crank 28 Rod 30 Cam 31 Adjusting means 34 Support member

Claims (1)

[Claims] 1. A saw tooth polishing machine comprising: a polishing head that supports a rotating grindstone and is moved up and down by an elevating means; The head ascending / descending means is a lever-driven type using a cam, and the center of rotation of the lever is supported by an eccentric shaft that is displaced upward by the rotation of a support shaft, and a crank is attached to the support shaft, A tooth backline changing device in a saw grinding machine, characterized in that a cam that operates in synchronization with the lifting cam of the polishing head is acted on one side and a fulcrum member that is moved and adjusted by an adjusting means is engaged on the other side. .