JPH0425086B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting resistance principal component force detection device mainly for a saw machine such as a band saw machine, a circular saw machine, or a machine saw.

First, the background of creating the present invention using the horizontal bandsaw machine illustrated in FIGS. 1 and 2 will be explained.

In the first article and FIG. 2, the illustrated horizontal bandsaw machine 1 is composed of a box-shaped base 3 and a cutting head 5, and the cutting head 5 can be raised and lowered from the base 3 via a horizontal hinge pin 7. is supported by

A work table 9 on which a workpiece W can be freely placed is provided on the upper part of the base 3, and a fixed jyo 11f and a movable jyo 11m, which can freely clamp and fix the workpiece W, are installed on the work table 9. A vice device 11 is provided.

The cutting head 5 has housing parts 13 and 15 spaced apart from each other on both sides, and each housing part 13 and 15 has a control box 1 on its upper part.
They are connected by a beam member 17 with 9.

The housing part 1 of the cutting head 5
3 and 15 have a driving wheel 21 and a driven wheel 2.
3 are installed internally via shafts 25 and 27, respectively, and an endless bandsaw blade 29 as a cutting blade is wound around the driving wheel 21 and the driven wheel 23.

Therefore, by driving the drive wheel 21, the band saw blade 29 is driven to travel in order to cut the material W to be cut.

The band saw blade 29 is guided and supported by a pair of fixed guide member 31 and movable guide member 33 in a cutting region where the band saw blade 29 cuts the material W to be cut, so that the tip of the tooth faces vertically downward.

The fixed guide member 31 and the movable guide member 33 are the guide members 3 fixed to the beam member 17.
It is installed on 5.

The fixed guide member 31 is fixedly attached to the guide member 35, and the movable guide member 33 is attached so as to be adjustable in position to correspond to the size of the material W to be cut.

Further, the cutting head 5 is configured to be moved up and down around the hinge pin 7 by a lifting cylinder 35 having a piston rod 39. It is possible to control the cutting of the band saw blade 29 and the upward separation from the band saw blade 29.

That is, in the known horizontal bandsaw machine 1 (cutting device) having the above configuration, the cutting head 5 is raised by supplying pressure oil to the chamber on the piston side of the lifting cylinder 7 and extending the piston rod 39. do.

By discharging the pressure oil in the chamber on the piston side of the lifting cylinder 37, the cutting head 5 is lowered by its own weight.

Therefore, by arranging an appropriate control valve in the discharge passage connected to the chamber on the piston side of the lifting cylinder 37 and adjusting the control valve appropriately, the band saw blade 29 (cutting blade) can cut the material W to be cut. The depth of cut can be controlled appropriately.

The arrow pointing in the opposite direction to the moving direction of the bandsaw blade 29 shown on the workpiece W in FIG. There is.

In other words, the cutting length of the band saw blade 29 in contact with the workpiece W is short near the top end when the workpiece W is a round bar as shown in the figure, becomes longest when cutting the diametrical part, and increases as it goes toward the bottom end. Then it becomes shorter again.

In other words, both the cutting resistance main component force 41 and the cutting resistance thrust force 43 change from time to time.

As mentioned above, the horizontal bandsaw machine 1 autonomously controls the cutting speed by the rotational moment around the hinge pin 7 caused by the weight of the cutting head 5, so it can detect momentary changes in the cutting length. It becomes necessary to control the descending speed (cutting speed) of the cutting head 5 in addition to autonomous control from the viewpoint of both cutting efficiency and prevention of damage to the saw plate.

The present invention provides a detection device that can more accurately detect the cutting resistance main component force 41 that changes as the cutting length changes.
A preferred embodiment will be described in detail with reference to the drawings.

The shaft 45 shown in FIG. 3 is the rear end of the shaft 25 of the drive wheel 21. There is also a band saw machine 1 in which the shaft 45 is a worm shaft and the outer periphery of the drive wheel 21 is used as the worm wheel to transmit rotational force.
From then on, the technical concept remains the same, transmitting rotational force to the drive wheel 21 without slipping.

A pulley 47 is loosely fitted onto the shaft 45, and a belt is wound around the output shaft of a drive motor (not shown). Adjacent to (above in FIG. 3) the pulley 47, an intermediate rotating body 51 is fixed to the shaft 45 with a key 53 with a spacer 49 interposed therebetween.

In this embodiment, the intermediate rotating body 51 has a rectangular block shape, and has vertically symmetrical holes 55 in FIG.
A protruding member 57 implanted in the pulley 47 is loosely fitted into the pulley 47, and a slide bush 59 serving as a spacer is provided around the hole 55 and between the pulley 47 and the pulley 47.

The intermediate rotating body 51 is provided with a screw hole 61 extending horizontally through its short piece, and a contactor 63 having a semi-circular recess that comes into contact with the side surface of the protruding member 57 mentioned above is inserted into the intermediate rotating body 51 by means of an adjusting screw 65. It is provided via a bullet material 67 whose biasing force can be freely adjusted.

Further, at the upper end of the protruding member 57 in FIG. is placed almost horizontally.

Next, as shown in FIG. 6, a channel-shaped bracket 73 is attached to the upper surface of the intermediate rotating body 51, and the rotary shaft 7 is horizontally mounted above.
5 is provided to be able to swing freely around the shaft.

As is clear from Fig. 4, the rotary shaft 75
A lever link 77 is attached near the outer end of the lever link 77, and a yoke-shaped joint 81 extending from the link 71 is connected to the lower end of the lever link 77 by a pin 83 so as to be able to swing freely.

The lever link 77 is connected to the rotary shaft 7 above.
5 and is fixed from the shaft end with a tip bolt 85 (see Fig. 5).

As is clear from Fig. 5, the rotary shaft 75
A lifter lever 89 is installed near the inner end of the rotary shaft 75 through a tubular spacer 87 between it and the bracket 73, passing through the rotary shaft 75 at right angles to its axial direction. It is fixed at 91.

As is clear from FIG. 4, a steel ball 93 is provided at the free end of the lifter lever 89, and this steel ball 93 is connected to the aforementioned drive wheel 2.
It engages with a hole 99 provided on the outer periphery of a slide ring 97 that can be raised and lowered while being guided by a guide shaft 95 provided on the rear end shaft 45 of the shaft 25 of 1.

Note that the slide ring 97 mentioned above is attached to the bearing box 101 at the upper part as shown in FIG.
The bearing box 101 is held in the support member 103 and is rotatable.
Since it is prevented from rotating by a rotation preventing arm 107 passing through a long hole 105 provided in the upper part of the figure, it corresponds to a non-rotating moving member that moves only in the vertical direction in a non-rotating state.

Shown in the upper part of FIG. 3 is a fluid pressure valve device 109 that controls the lowering speed of the cutting head 5, in other words, the cutting speed, by utilizing the linear upward and downward displacement of the bearing box 101.

According to the apparatus according to the embodiment of the present invention described in detail above, during idle cutting of the band saw blade 29, the main component of the cutting resistance is 41.
is extremely small, so the protruding member 57 has a contact 63 biased by a bullet 67 whose biasing force is adjusted in advance.
The shaft 45 is pushed to the right in FIG.

Next, as the band saw blade 29 cuts into the long cutting length part of the material W to be cut, the main cutting resistance force 41 gradually increases. is compressed, and the protruding member 57 moves to the left within the hole 55.

Since the amount of leftward movement of the protruding member 57 described above is the same as the leftward movement of the ball joint 69, the link 71 moves to the left by the same amount, causing the lever link 77 to swing clockwise in FIG. The rotary shaft 75 is also swung.

Lifter lever 89 is also attached to rotary shaft 7.
5 in the clockwise direction to raise the slide ring 97.

The rise of the slide ring 97 coincides with the rise of the bearing box 101, but since the bearing box 101 is not rotated by the detent arm 107, as a result, the main component of the cutting resistance force 42
It was detected as a linear movement of a non-rotating moving member proportional to the increase in .

Even when the band saw blade 29 passes the maximum cutting length portion of the material W to be cut and the main component of cutting resistance 41 decreases, the amount of movement in the opposite direction can be detected in exactly the same way as a linear movement of a non-rotating moving member. Duplicate explanations will be omitted.

As can be understood from the above description of the embodiments, in short, the present invention is a saw machine in which a drive pulley 47 is fitted to a shaft 45 for driving a saw blade 29 so as to be relatively rotatable therein. The eccentric position of the intermediate rotating body 51 provided and fixed to the shaft 45 and the pulley 4
An elastic member 67 for transmitting the rotation of the pulley 47 to the intermediate rotating body 51 is provided between the eccentric position of the pulley 47 and the eccentric position of the pulley 47.
A detection device is provided for detecting changes in expansion and contraction of the elastic member 67 due to relative rotation between the pulley 47 and the shaft 45.

As is clear from the above configuration, in the present invention, the eccentric position of the intermediate rotating body 51 fixed to the shaft 45 for driving the saw blade 29, and the An elastic member 67 is provided between the eccentric position of the pulley 47 for transmitting the rotation of the pulley 47 to the intermediate rotating body 51, and the elastic member 67 transmits the rotation of the pulley 47 to the intermediate rotating body 51. A detection device for detecting changes in expansion and contraction of the elastic member 67 is provided.

That is, according to the present invention, the rotation of the pulley 47 is moved from the shaft 45 to a position that is largely eccentric from the axis of the shaft 45.
Since the main component force of the cutting resistance of the saw machine is detected by providing an elastic member 67 that transmits transmission to the elastic member 67 and detecting changes in the expansion and contraction of the elastic member 67, the main component force of the cutting resistance of the saw machine is detected. axis 4 at the position
This means that the load fluctuation (fluctuation in the principal force component of the cutting resistance) of No. 5 is detected, and the fluctuation in the principal force component of the cutting resistance can be detected with higher accuracy.

[Brief explanation of drawings]

FIG. 1 is a front view of a horizontal bandsaw machine to explain the background of the present invention, FIG. 2 is a diagram to explain the main component of cutting resistance of the same horizontal bandsaw machine, and FIG. 3 is an overall view of the apparatus of the present invention. FIG. 4 is an enlarged partial sectional view showing the vicinity of the intermediate rotating body of the apparatus of the present invention, FIG. 5 is a plan view of the same intermediate rotating body, and FIG. 6 is a side view of FIG. 5. Explanation of symbols representing main parts of the drawings: 1...Band saw machine, 21...Drive wheel, 41...Main component of cutting resistance, 45...Shaft, 51...Intermediate rotating body, 57...
... Projection member, 67 ... Bullet material, 75 ... Rotary shaft, 89 ... Lifter lever, 97 ... Slide ring.

Claims (1)

[Claims] 1 Shaft 4 for driving saw blade 29 in saw machine
5, a drive pulley 47 is fitted to the shaft 45 so as to be relatively rotatable, and the intermediate rotating body 5 is fixed to the shaft 45;
An elastic member 67 for transmitting the rotation of the pulley 47 to the intermediate rotating body 51 is provided between the eccentric position of the pulley 47 and the eccentric position of the pulley 47, and The elastic member 6
7. A cutting resistance main component force detection device for a saw machine, characterized in that it is provided with a detection device for detecting changes in expansion and contraction.