JPS58149125A - Cutting equipment - Google Patents

Abstract

PURPOSE:To improve the safety of the operator by employing an electrical motor as an drive source for performing the approach/departing motion between a circular saw and a safety cover and performing said motion quickly and reliably through a synchronous operating mechanism. CONSTITUTION:A horizontal table 12 is placed on top of a machine table 10 constituting of a housing made of steel plate or through casting, then a material to be cut 14 such as wood is mounted on said table 12 and a safety cover 16 will clamp said material from above thereafter a circular saw 18 will lift from the lower side of the table 12 to cut said material 14. One end of a rolling arm 30 constructed of a rectangular frame is pivoted through a pivot shaft 32 to a bracket 28. Furthermore a seesaw arm 48 is journaled seesawably through a pivot shaft 50 to a bracket 46. With such structure, the safety of the worker can be improved.

Description

[Detailed description of the invention] This invention relates to a cutting device.

More specifically, in a cutting device in which an object to be cut placed on a table is clamped with an upward safety cover, and a circular saw rises from below the table to cut the object, the circular saw and the safety cover are used. The present invention relates to a cutting device that is designed to quickly and reliably perform mutual approach and separation operations to improve safety and reduce manufacturing costs.

As mentioned above, keep the object to be cut on the table safe: l'
A device that cuts an object by cutting it with a cover and a circular saw rising from below the chest to cut the object is generally called a jumping cross cutter and has become widely used. However, in this type of cutting device, the synchronized movement of the circular saw and the safety cover toward and away from each other is performed using an air cylinder or a screw cylinder.

There were drawbacks such as slow response speed and the need for a separate near compressor as an air pressure source for driving the air cylinder. In addition, since air is a pressure-moving body, if an air cylinder is installed in the link system that connects the circular saw and the safety cover, absolute reliability of the link operation cannot be obtained, and it is difficult to ensure worker safety. This poses a major problem. Furthermore, when used in a cold region, there is a concern that the drain in the air piping system may freeze and the air cylinder may not operate.

The cutting device according to the present invention has been devised to address the above-mentioned drawbacks of the prior art, and is capable of replacing the use of an air cylinder as a driving source for moving the circular saw and the safety cover toward and away from each other. Uses an electric motor that operates reliably and does not require a compressor. The purpose of the present invention is to quickly and reliably approach and separate the circular saw and the safety cover through a precise synchronized operating mechanism, thereby improving worker safety.

To achieve this purpose, the cutting scissors 11I according to the present invention crank the object to be cut on the table upward with a safety cover, and the circular saw moves upward from below the table to cut the object. In the cutting Wfr device, the safety cover is supported so as to be movable up and down on a table, and a swing arm is provided that connects one end to the safety cover to give it an up and down motion, and the other end is pivotally connected to the machine base. A seesaw arm with a circular saw rotatably supported at one end is rotatably supported on a bracket fixed to the machine base, and one part of the bushing rod is movably connected to the swinging arm. At the same time, the pumping rod "Claim" is pivotally connected to the other end of the seesaw arm, and furthermore, a crank motion rod eccentrically connected to the rotating disk is pivotally connected to the seesaw arm, and the crank movement of the disk causes the By moving the seesaw arm, the safety cover is lowered prior to the raising of the circular saw, and the safety cover is raised after the circular saw has been lowered.

In this case, a long hole is provided at one end of the swinging arm, and a bottle fixed to the safety cover is slidably inserted into the long hole.
Preferably, the WII is configured to convert the rocking wJ movement of the rocking arm into the lifting and lowering movement of the safety cover.

Further, the swing arm is always elastically biased to descend toward the table surface by interposing a tension spring or an air cylinder force between the arm and a hook fixed below the machine base.

The rotating disk is fixed to the output shaft of a motor-driven reduction gear with an electromagnetic clutch brake, and a dog provided on the circumference of the rotating disk contacts a limit switch placed on its orbit. It is configured to energize the tortoise magnetic clutch and brake to move the circular saw and the safety cover toward and away from each other every rotation of the rotary disk.

Preferably, the distance from the pivot point of the seesaw arm and the bracket to the pivot point of the seesaw arm and bushing rod is the distance between the pivot point of the swing arm and the bushing rod and the distance between the swing arm and the machine base. The distance to the pivot point is also set large, thereby achieving a timing operation in which the safety cover is lowered before the circular saw is raised, and the safety cover is raised after the circular saw has been lowered.

Next, the cutting device according to the present invention will be described in detail below by citing preferred embodiments and referring to the attached drawings! I! ! I will clarify.

FIG. 1 is a longitudinal cross-sectional view schematically showing a motion transmission thread of a cutting device according to the present invention, in which - a horizontal table is placed on the top of a machine base 10 consisting of a casing made of a plate or a cast product; is located, and wood and other objects to be cut are placed on this table 7.2.
The safety cover 74 clamps the object to be cut /≠ from above, and the circular saw /l rises from below the table to cut the object to be cut /4t.

That is, the safety cover/l is a horizontal workpiece holder/l.
klλOt- and its - side as said table/-
The slide bar 2t (this is the The front safety cover/
B can be raised and lowered horizontally with respect to table/2. It should be noted that this structure can also be implemented using a rank mechanism. In addition, 7 rackets are fixed to the wall at the center of the image of the machine stand 10 located above the table.
One end of a swinging arm 30 made of a rectangular frame is pivotally attached to this bracket l via a pivot 3-. The other end of the swing arm 30 is provided with an oblong hole 3, as shown in FIG.

Safety force bar/3t bottle fixed horizontally near the rear end of 40
The long hole 34! -Insert the finger freely inside. In this case, in order to smoothly slide the swinging arm 30, it is desirable to dispose a ball bearing 3t around the outer periphery of the bin 36 (as shown in the first embodiment). When the movable arm 30 is swung about the pivot 3λ, the bin 34 (and bearing 31) slides in the elongated hole 34L, so that the swiveling movement of the arm 30 is controlled by the safety cover/j. It will be understood that the movement is smoothly converted into the vertical movement of The swing arm 3
0 and, by extension, the safety cover/B are always elastically biased so that they descend toward the table 7.2 surface.

Next, in the machine base/Q below the table lλ, there is a circular saw/l
A mechanism is provided to raise and lower the table surface. That is, as shown in FIGS. 1 and 2, a yoke-shaped bracket 6 is fixed upside down on the inner surface of the horizontal top of the machine io,
The seesaw arm at is attached to this booklet≠B via the pivot @jO so that the seesaw can freely move. The seesaw arm at is the seventh arm centered on the axis j0!
The rotation 11 is divided into λ, #44.2 arm, and t4I-, and is supported through a bearing 74 provided at the end of the seventh arm j.
1. A circle @/If is detachably fixed to one end of the tr via a clamp O. Also, the seesaw arm≠
At the end of the first arm j of t, there is a single sink rod 62.
is pivotally supported via the bin 4/If. Note that the first arms j, 2 and 1IIJ of the seesaw arm≠l
The core arm re is not necessarily a body molded product, and in the case of this embodiment, as shown in FIGS. 2 and 3, the first arm j and the first arm j are separate bodies. formed and individually fixed to the pivot SO (thus both arms !λ, axes*h of j≠ are not aligned identically). The opposite end of the bushing rod 6-, which is pivotally connected to the first arm j, is
The connecting member ≦ (see figure m7), which is rotatably connected to the swing arm 30, is slidably pushed through and connected. As shown in FIG. 1, the bushing rod 6λ has a ring-shaped cushion rubber 70 whose height can be adjusted with a nut tt.
The size of the sliding area at t is regulated. Therefore, in FIG. 1, if the bushing rod O λ moves upward, the connecting member 6
t comes into contact with the cushion rubber 70 and is pressed, causing the swinging arm 30 to pivot upward, and conversely, by moving the bushing rod 6 downward, the rod 6λ will slide against the connecting member 2. However, as mentioned above, the swinging arm 30 is elastically urged downward by the tension spring p+, and when the bushing rod t moves downward, the swinging arm 30 instantly follows this movement. Make a downward turn. Therefore, it is understood that the safety cover 76 also moves up and down with respect to the table 7.2 in response to the upward and downward movements of the bushing rod 6.2. In the F9T sheath link machine shown in the figure, which is composed of a rod 6.2 and a swinging arm 3Q, the dimension of the connecting arm j, that is, the distance α from the pivot @jO to the pin 6, is 1! i
The distance β from the connection point of the movable arm 30 with the mounting rod t-2 to the pivot shaft 3-2 is also increased (α>
β) Set dimensions in advance.

Ninth, the motor 7- is disposed so as to be substantially coaxial with the pivot shaft 10 of the seesaw arm 4tt, and its rotating shaft 74 is installed! - A pulley 74 is fixed to the end of the circular saw rotating shaft sr, and a pulley 71 is fixed to the end of the circular saw rotating shaft sr.
is wound so that the rotation of the motor 7λ is transmitted to the circular saw/r. In this case, a support plate l is disposed on the first arm jλ so that its position can be adjusted freely, and a tension roller 14A is pivotally attached to the support plate lλ to adjust the tension of the belt to.

A speed reducer rr equipped with an electromagnetic clutch and brake is arranged and fixed on the bottom plate it of the machine base 10. In this fIIC machine, power is transmitted via the motor PO and the V-belt tacho, and the crank rod is connected to the rotary disk fixed to the output shaft of the reducer via the bin IOO. It is eccentrically connected so that it can rotate freely. The upper end of the two-linked rod t is similarly pivotally connected to the fs/arm j-side of the seesaw arm≠l. Therefore, if the bin 100 of the multi-rotating disc 6 rotates due to the rotation of the motor O, then
A crank movement is generated in the crank rod t, and the seesaw arm 4tlr moves around the pivot axis j0. As shown in Figure 7, 10 dogs are attached to the outer periphery of the rotating disk plate t, and the roller granger 106 of the limit switch ioiwt is placed on the orbit of the dogs. The limit switch 10g is the reducer r
It is connected to the electric control circuit of r and energizes the electromagnetic clutch and brake (not shown).

Next, the operation and effect of the cutting device according to the present invention configured as described above will be explained. (At this time, the safety cover 76 is raised to its upper limit when the object to be cut is violently placed on the table 2.) ) at the same time with both hands to turn on the electrical system switch, the motor 7λ rotates and rotates the circular saw/l inside the machine casing below the table. The motor O built in the reducer also rotates, and at this time the electromagnetic clutch is connected, so the disc t connected to the reducer rr rotates and the crank rod l performs a crank operation.

This ninth scene - Arm HiroI is the pivot! The bushing rod j-2i [ntl arm 30 pivotally connected to the first arm j4I-] slides freely and descends. However, the swing arm 3
0 swings counterclockwise about the pivot 32 as a result of being always elastically biased downward by the tension spring 4I-l.

Eventually, the safety cover 76 is lowered toward the table surface to securely clamp the object to be cut. In addition, the first arm j of the scene arm 4tt rotates and raises the circular saw/l toward the table/2 in a rotating state, and the workpiece/4 clamped by the safety cover/6. ! - Perform the cutting.

In this case, the descent of the safety cover 76 and the rise of the circular saw 7g due to the seesaw movement of seesaw arm≠t are as follows:
The collapse also starts at the same time.

In terms of timing, the safety cover 14 is lowered before the circular saw/I rises above the table, and the object to be cut is lifted. As mentioned earlier, this is the second arm! The distance α between the axes of the swing arm 30 is also larger than the distance β between the axes of the swing arm 30,
This is also because the distance from the pivot jO to the center of the circular saw is set to be greater than the distance from the bin 3t to the center point of the connecting member g6.

Next, when the rise of the two-link rod t reaches the stroke end, the seesaw arm 4tr seesaws counterclockwise to move the bushing rod 6 upward. At this time, the bushing rod 6- is inserted through the cushion rubber 70.

! Press the connecting member t6 and pull it (
The swinging arm 30 is pivoted against the tensile force of
Swing clockwise around I3 to raise the safety cover 76. Further, the l-th arm λ descends in a large circular motion about the pivot axis jO, and as a result, the circular saw/l is retracted from the lower two surfaces of the table into the lower machine casing.

In this case, the timing is set so that the safety cover 76 rises after the circular saw/l descends below the table.

In this way, the rotation of the disk 26 causes l cycles of scene motion where the seesaw arm≠t.As mentioned earlier, the outer circumference of the disk 4 has a dog/Q
has been identified, and the 10 limit switches located on the site of that station
By pressing the disc/rotation, the deceleration bit
The electromagnetic clutch and brake are activated to instantaneously stop the disc t.

As described above, in the cutting device according to the present invention, the circular saw and the safety cover are brought close to each other and separated from each other by the cracking action of the link mechanism, which is extremely reliable and contributes significantly to improving worker safety. It is something. In addition, approaching/departing movements are performed quickly.

/ Since the start and stop of each cycle is performed using an electromagnetic clutch and brake, there is no impact noise, and the operation is quiet. Furthermore, since Tanabata is used as a driving source, there is no need for incidental equipment such as a near compressor, and there are many advantages such as low manufacturing costs and friction.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional side view showing an outline of the motion transmission system of the cutting device according to the present invention, FIG. 4 is a cutaway front view of the same device, and FIG. 3 is a schematic explanatory view with the top of the device opened. . /θ...Machine base /Co...Table/lI
-...Device to be cut 16...Safety cover/r.
...Circular saw −〇...Pressing surface λλ...Guide boss≠...Channel groove, 26...Slide bar at...Bracket 30...Swivel arm
3-...Pivot 3g...Long hole 3O...Pin 3t...Bearing
Tension spring 1... Bracket at... Seesaw arm! 0... Pivotal 1181j Co... ml arm... L arm jt... Bearing! T...
・Rotating shaft 4Q...4 flanges...Bushing rod 11...Bin 44...Connection member
41...nut 70-°° cushion rubber
7λ...Motor 74I...Rotating shaft 7bu, 71...Pulley ro...Belt t@2...Support plate l≠...Tension roller 16...Bottom plate 11.
...Reduction gear PO-°°%-'Pco...V belt? ≠...Output axis t...Rotating disk 21...Crank rod 100...-v y io...
Dog 1o4L...Limit switch 104...Plunger 101...Switch patent applicant Iida Kogyo Co., Ltd.

Claims (1)

[Claims] (17) A cutting device in which a workpiece on a table is clamped with an upper safety cover, and a circular saw rises from below the table to cut the workpiece, the safety cover is attached to the table. A swing arm is provided to support the safety cover so that it can be raised and lowered freely, one end of which is connected to the safety cover to give it an up and down motion, the other end is pivotally connected to the machine base, and a circular saw is rotatably mounted on one end of the swing arm. The supported seesaw arm is rotatably supported on a placket fixed to the machine base, one end of a bushing rod is slidably connected to the swinging arm, and the other end of the bushing rod is connected to the seesaw arm. A crank motion arm, which is pivotally attached to the other end of the arm and further eccentrically connected to a rotating disk, is pivotally attached to the seesaw arm, and the seesaw arm is moved by the crank motion of the disk. A cutting device characterized in that a safety cover is lowered before the circular saw is raised, and the safety cover is raised after the circular saw is lowered. (2) A long hole is formed in one end of the swing arm. Drilling. A bottle stopped by the safety cover is slidably pushed through the elongated hole to convert the swinging motion of the swinging arm into the lifting and lowering movement of the safety cover. The cutting device according to item 1. (3) The swinging arm is always resilient so as to descend toward the table surface by interposing a tensioning means between the arm and a hook fixed below the machine base. Claims 1 and 9 are the cutting device according to claim 1. (4) The rotating disk is fixed to the output shaft of a motor-driven speed reducer with an electric reef clutch brake, and When the dog provided on the circumference of the plate comes into contact with the liquid switch placed on the rotation locus, the spot magnetizing switch and the brake are activated, and the circular saw and the brake are activated for each rotation of the rotary disk. Claims 7 to 1g that involve the approach and separation of the safety cover
The cutting device described in Section 3. (5) The distance from the pivot point of the seesaw arm and bracket to the pivot point of the seesaw arm and bushing rod, and the distance between the swing arm and the machine base from the connection point of the swing arm and bushing rod. The cutting device according to any one of the claims, wherein the cutting device is set to be larger than the distance to the pivot point.