JPS6254603B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for setting the upper limit of a housing in a cutting machine such as a horizontal band saw, and more particularly, to a saw blade housing equipped with a tool for cutting a workpiece. This invention relates to an upper limit setting device that raises and stops at a predetermined position.

Conventionally, in order to raise and stop the saw blade housing at a predetermined position, a mercury switch is provided, for example as shown in Japanese Utility Model Publication No. 40-33988, and the inclination angle of the mercury switch is adjusted depending on the size of the material to be cut. By making appropriate adjustments, the raised stop position of the saw blade housing was controlled.

Therefore, in the above technique, the lifting stop position of the saw blade housing must be calculated in advance according to the height of the workpiece, and it is not easy to set the lifting stop position.

Further, as a device for setting the upper limit of the housing, there is a device that adjusts the position of the dog or the limit switch in a structure using a dog and a limit switch that are provided so as to be freely adjustable in position.
However, with this device, it is necessary to go to the rear of the cutting machine to adjust the position of the dog, etc.
In addition to being extremely troublesome, it was necessary to calculate the relationship between the dog and the limit switch in advance depending on the height of the workpiece, making it difficult to set the raised position.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to easily and reliably set the rising stop position of the housing and the positional relationship between the workpiece and the housing. The objective is to provide a device that can perform this.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a horizontal band saw machine 1 as an example of a cutting machine, and this horizontal band saw machine 1 electrically controls the position of a saw blade housing 5 provided on a machine stand 3 during lifting and lowering operations by a lifting cylinder 7. It is equipped with a height position detecting means for detecting by a signal. Also,
When the saw blade housing 5 is lowered, the detected value of the height position of the saw blade housing 5 when a saw blade start push button 11 is pressed to start driving the saw blade 9, which is an example of a cutting tool, is set to the upper limit position. It is equipped with a storage unit that stores the information as follows. Furthermore, the horizontal bandsaw machine 1 is configured to stop the rising of the saw blade housing 5 when the rising position of the saw blade housing 5 coincides with a pre-stored upper limit position. Position control means 1 that outputs a control signal
It has 3.

In addition, reference numeral W is a workpiece fixed on the support stand 15 by a vice device 17, and 19 is a hinge shaft. In addition, 21 is a descending speed switching detection body,
When the height of the material to be cut W is detected, a detection section 23 such as a limit switch is activated to change the lowering speed of the saw blade housing 5 from rapid lowering to a speed for cutting. The descending speed switching detection body 21 is provided on the saw blade housing 5 so as to be able to slide up and down, and even after the detection surface 21-A contacts the workpiece W, even if the saw blade housing 5 continues to descend. The descending speed switching detection body 21 slides along the guide surface of the saw blade housing 5 without descending.

The position control means 13 includes a position detection section 25 as a height position detection means for detecting the height position of the saw blade housing 5, and a signal processing section 27 as a control section. In this embodiment, the position detection unit 25 includes a detection body (wiper) of a potentiometer 29 provided on a shaft (not shown) that is fixed with respect to the vertical movement of the saw blade housing 5. A detection object (resistance) biased at a predetermined voltage level +V of the potentiometer 29 is provided on a rotating body rotatably fitted to the shaft of the rotary body, and one end is connected to the machine base 3 on the outer periphery of the rotating body. A conductive member 30, such as a wire, is fixed, and the other end is wound around the rotating body multiple times and fixed.
The position detection unit 25 detects the potentiometer when the rotary body having the object to be detected (resistance) of the potentiometer 29 rotates due to relaxation of the conductive member 30 as the saw blade housing 5 is raised and lowered by the raising and lowering cylinder lid 7. The position of the saw blade housing 5 is detected based on the electrical signal level output to the signal processing section 27 as the resistance of the meter 29 changes. In addition, between the rotating body and the fixed shaft,
A spring (not shown) such as a coil spring is provided to rotate the rotating body in a direction that keeps the conductive member 30 under tension.

In addition, as shown in FIG.
1 and a connecting rod 43, or as shown in FIG.
A rotary body 53 having a detection object (resistance) of the potentiometer is provided with a potentiometer on the rod 45 portion, and a chain wire 51 with one end fixed to the cylinder 47 and the other end fixed to the sliding rod 49.
The height position of the saw blade housing 5 can also be detected by a method such as rotating the saw blade housing 5.

On the other hand, as shown in FIG. 21-A is not in contact with the workpiece W and the detection unit 23 is not operating, when the saw blade start button 11 is pressed, the saw blade housing 5 from the position detection unit 25 is set to the upper limit position. a storage section 31 that stores an electric signal indicating the position of the saw blade housing 5, and a signal indicating the stored upper limit position and the saw blade housing 5 from the position detection section 25;
and an electric signal indicating the position of the saw blade housing 5. When the two signals match, a comparison section 35 outputs a control signal to a relay 33 for stopping the lifting operation of the saw blade housing 5. Note that when the upper limit position is stored in the storage section 31, for example, an indicator light 37 provided at the front center of the saw blade housing 5 lights up. Further, when the detection surface 21-A of the descending speed switching detection body 21 is in contact with the workpiece W, the detection section 23 is activated, and the contact point indicated by the reference symbol S is turned off and the potentiometer is turned off. 29
If the lower surface of the saw blade 9 is below the upper surface of the workpiece W, the upper limit will not be set even if the saw blade start button 11 is pressed.

Next, the operation of this embodiment will be explained.

After turning on the power, the saw blade housing 5 is raised to the highest position and the workpiece W is fixed to the vise device 17. Thereafter, the saw blade housing 5 starts lowering, and the saw blade housing 5 is brought close to the workpiece W by a predetermined distance while visually observing the workpiece W, taking into account variations in the shape of the workpiece W. Thereafter, by pressing the saw blade start button 11, the driving of the saw blade 9 is started, and the detected value of the position detecting section 25 is stored in the storage section 3.
1, and when the storage unit 31 stores the height position of the saw blade housing 5 at that time as the upper limit position, the indicator light 37 lights up to indicate that it has been stored.

Then, the saw blade housing 5 is further lowered,
After cutting the material W to be cut and finishing the cutting, the hydraulic circuit is automatically switched by normal means, and the saw blade housing 5 is raised by the extension operation of the lifting cylinder 7. When the saw blade housing 5 reaches the upper limit position that was set and stored when starting the saw blade 9, the detection value of the position detection section 25 and the input value stored in advance in the storage section 31 match, and the comparison section 35 A control signal is output to the relay 33 to stop the saw blade housing 5 from rising.
stop the rising operation.

Next, the fixation of the cut material W by the vise device 17 is released, the cut material W is sent out, positioned, and clamped and fixed by the vise device 17 again.

Then, as described above, the saw blade housing 5 is lowered again from the set upper limit position, and the cutting process is repeated.

Therefore, according to this embodiment, the lifting stop position in the saw blade housing is set at the position where the saw blade starts driving after checking the cutting conditions, so the upper limit position can be changed easily and reliably. The upper limit position can be set. Furthermore, when the saw blade in the saw blade housing is located below the height of the workpiece, the upper limit position is not set even if the saw blade starts to be driven, so it is safe.

As can be understood from the above description of the embodiments, the gist of the present invention is as stated in the claims. The height position of the housing is constantly detected by the height position detecting means provided in conjunction with the housing, and when the tool comes into contact with the workpiece due to the housing being lowered from the raised position, The detection value of the height position detection means is inputted to and stored in the storage section provided in the signal processing section by the input means. Then, when the housing is returned to the upward position, the upward return of the housing is stopped when the detected value of the height position detecting means matches the detected value stored in the storage section of the signal processing section.

That is, according to the present invention, when the housing is lowered and the tool approaches the workpiece, the position at which the housing should rise and stop is set, so even if the height of the workpiece is different. Even though
It is extremely easy to set the housing to stop rising when the tool is slightly separated from the workpiece. Also, since the housing rise stop position is set when the housing is lowered, for example, unlike the case where the housing rise stop position is set in advance before the start of cutting the workpiece, the height of the workpiece can be adjusted. There is no need to know this in advance, and there is no possibility of setting errors.

Note that the present invention is not limited to the embodiments described above, and can be implemented in other embodiments by making appropriate changes. For example, the height position detection means, input means, etc. can be easily changed.

[Brief explanation of the drawing]

Fig. 1 is an explanatory front view of a horizontal bandsaw machine as an example of a cutting machine, Fig. 2 is an explanatory view showing an example of the configuration of the position control means, and Figs. 3 and 4 are illustrations of other positions of the saw blade housing. It is an explanatory diagram showing a detection method. (Explanation of symbols representing main parts of the figure), 5...
...Saw blade housing, 11...Saw blade start push button, 31
. . . storage section, 25 . . . position detection section, 35 . . . comparison section.

Claims (1)

[Scope of Claims] 1. A device for setting the upper limit of a vertically movable housing in a cutting machine, which comprises: a height position detection means for detecting the height position of the housing in conjunction with the vertical movement of the housing when the tool is lowered to approach the workpiece W above; and when the tool approaches the workpiece W; To,
The detected value of the height position detection means is transmitted to the signal processing section 27.
an input means for inputting data to a storage unit 31 provided in the housing; and after the cut material W is cut by the tool provided in the housing, when the housing is raised and returned, the height position detection means Comparing means for comparing the detected value and the detected value inputted into the storage section 31 and outputting a signal for stopping the rising of the housing when both detected values match; Housing upper limit setting device for cutting machines. 2. Claim 1, characterized in that the input means for inputting the detected value of the height position detection means into the storage unit 31 also serves as an input means for starting the drive of a tool provided in the housing. Apparatus described in section.