JPH02218512A - Work piece presence detecting method for cutting machine and its device - Google Patents

Abstract

PURPOSE:To enable the presence of a work piece to be positively detected automatically by making the movable vice of a feed vice come close to a stationary vice, and thereby comparing the value of the detected distance from the stationary vice with the width of the work piece stored in a memory. CONSTITUTION:The distance L1 from the tip end of a stationary vice 33 to the tip end of a movable vice 35 is set in advance, the movable vice 35 is moved to the stationary vice 33 side by a hydraulic cylinder 37 via a piston rod 49, the amount of movement is counted by a counter 71 while the revolution of a contact roller 63 is being detected by an encoder 67, the amount of the movement L2 of the movable vice 35 is operated by an operating device 73 so that the actual distance L from the tip end of the stationary vice 33 is thereby operated. The distance L is inputted into a comperator 75 so as to be compared with the width L0 of the work piece W stored in a memory 77. When L is equal to L0, it is judged that the work piece is present, the work piece W is thereby clamped so as to be forwarded to a cutting section so that it is cut off to be of a desired length. When L is smaller than L0, it is judged that no work piece is present, a signal is transferred to a NC device 79 so that commands for a process disposing of remaining members left after cutting and for the supply of a following work piece W are directed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a method for detecting the presence or absence of a workpiece in a cutting machine, which is capable of detecting the presence or absence of a workpiece when feeding the workpiece with a feeding vise in the cutting machine. The present invention relates to a detection method and device.

(Prior Art) Recently, for reasons of ease of use, feed vise devices for cutting machines such as saws have been changed from rack type to full stroke type vises operated by push buttons.

In addition, known methods for detecting the presence or absence of a workpiece using this feeding vise include a detection method using a limit switch and a dog, and a detection method using a constant differential pressure type pressure switch.

(Problem to be Solved by the Invention) By the way, in the conventional detection method using a limit switch and a dog to detect the presence or absence of a workpiece, it is necessary to adjust the position of the dog every time the dimensions of the workpiece change. , due to setup man-hours, or malfunctions caused by forgetting to make adjustments.
There was ff1. In addition, since there is no adjustment, in a device that detects the absence of a workpiece when the vise front is closed, if even one piece is clamped when cutting a bundle, the detection of no workpiece will not work, and the saw blade may be damaged. There was a problem that it could also lead to AM on the board.

Roughly speaking, the detection method using a constant differential pressure type pressure switch is as follows:
This is to check whether the workpiece is clamped by the rise in pressure that occurs during clamping, and if there is no workpiece, after the clamping operation,
If the pressure does not rise even after the expected clamping time has elapsed, it is assumed that there is no workpiece. Therefore, if a pressure reducing valve is used in the feed vise to lower the pressure, or if the workpiece is small, stable time settings cannot be made, and it may be determined that there is a workpiece due to the fully open rising signal of the vise even though there is no workpiece. There was a problem with this.

An object of the present invention is to improve the above-mentioned problem by installing a workpiece width detection device in a feed vise, and using this workpiece width detection device to automatically and reliably detect the presence or absence of a workpiece in a cutting machine. An object of the present invention is to provide a presence/absence detection method and its @direct method.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a method for feeding a workpiece to a cutting section using a feeding vise that includes a fixed vise and a movable vise. When the movable vise is brought closer to clamp the workpiece, the distance from the fixed vise is determined using a workpiece width detection device provided on the movable vise, and compared with a preset workpiece width Lo. This is a method for detecting the presence or absence of a workpiece in a cutting machine that detects the presence or absence of a workpiece.

The present invention also provides a feeding vise having a fixed vise and a movable vise, a workpiece width detection device provided on the movable vice in the feeding vise and detecting the distance from the fixed vise, and a workpiece width detecting device that detects the distance from the fixed vise, and The cutting machine is equipped with a set value memory for storing Lo, and a comparator for comparing the actual workpiece width Lo stored in the set value memory with the distance detected by the workpiece width detection device. A workpiece presence/absence detection device was constructed.

(Function) By adopting the method and device for detecting the presence or absence of a workpiece in a cutting machine of the present invention, when cutting a workpiece with the cutting section of the cutting machine II, the workpiece is clamped with a feeding vise, and the clamped workpiece is Feed the material to the cutting section. At this time, the presence or absence of the workpiece is detected by a workpiece width detection device provided on the movable vice of the feed vise. That is, by bringing the movable vice of the feed vice closer to the fixed vice, the actual distance ML from the fixed vice is detected each time by the workpiece width detection device. This detected actual distance and the workpiece width Lo stored in the setting value memory
When compared by a comparator, if it is L-Lo, it is determined that there is a workpiece, and if it is L-Lo, it is determined that there is no workpiece, so that the presence or absence of a workpiece is automatically and accurately detected. In this case, if there is a workpiece in the feed vise, the workpiece width detection device comes into contact with the workpiece and detects L=Lo to make a determination.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

Referring to FIG. 4, a cutting section 5 is provided on a main body frame 3 of a horizontal bandsaw machine 1 serving as a cutting machine.

The work W to be cut by the cutting section 5 is clamped and fixed by a main body vise 7 provided on the main body frame 3. In order to place and support the workpiece W, a support frame 9 is integrally connected to the main body frame 3 and extends in a direction perpendicular to the cutting direction of the cutting section 5 .

A feed vise 11 is provided on the support frame 9 to feed the workpiece W to the cutting section 5 and is movable back and forth. The main body frame 3 and the support frame 9 are provided with a stroke adjustment device 113 for adjusting the movement range of the feed vice 11, that is, the stroke length.

The cutting dimension set by the stroke adjustment device 13 is displayed following the operation of the stroke adjustment device af13, and a display B115 that can independently correct the displayed value is located at the lower left corner of one end of the main body frame 3 in FIG. It is provided.

A normal saw blade housing 17 constituting the cutting section 5 is mounted on the main body frame 3 so as to be rotatable in the vertical direction about a hinge bin (not shown). The saw blade housing 17 has a drive wheel (not shown) rotatably driven by a drive 11JrA and a driven wheel (not shown) paired with the drive wheel, respectively, rotatably installed therein.

A loop-shaped band saw blade 19 having an appropriate cutting width for cutting the workpiece W is wound around the driving and driven wheels. Also, on the main body frame 3, the main body vise 7
is installed. Body vice equipped! 7 is a fixed vise 21
, the cutting direction of the cutting section 5 (left-right direction in FIG. 4)
The movable vise 23 is movable in the same direction as the fixed vise 21, and the hydraulic cylinder 25 is configured to move the movable vise 23 forward and backward relative to the fixed vise 21.

Note that a limit switch 27 is attached to the main body vise 7 to detect when the feeding vise 11 that performs the material feeding operation is moved toward the main body vice 7 and the material feeding operation is completed as described later.

A plurality of support rollers 29 that support the work W are rotatably attached to one end (upper end in FIG. 4) of the support frame 9. Moreover, on the support frame 9,
A plurality of guide rails 31 extending in a direction perpendicular to the cutting direction of the cutting section 5 (vertical direction in FIG. 4), that is, in the material feeding direction, are attached.

The plurality of guide rails 31 include the feed vise 11.
is supported for free movement. The feed vise 11 has substantially the same structure as the main body vise 7 described above, and includes a fixed vise 33, a movable vise 35, a hydraulic cylinder 37 that moves the movable vise 35 forward and backward relative to the fixed vise 33, and the like.

Moreover, the feed vise 11 is arranged so that the plurality of idle rails 3
The piston rod 41 is appropriately connected to the tip of the piston rod 41 of a feed vice moving cylinder 39 extending parallel to the feed vice moving cylinder 39, and is moved toward and away from the main vice 7 by the operation of the feed vice moving cylinder 39. Note that the feed vice moving cylinder 39 is constituted by a double-acting cylinder operated by hydraulic pressure.

A screw rod 43 that constitutes a part of the stroke adjustment device 13
is extended horizontally in the material feeding direction, and the main body frame 3
The end portion is supported by a support frame 9 so as to be rotatable. A stopper 45 that is movable in the material feeding direction by rotating the screw rod 43 in an appropriate direction is screwed between the end of the support frame 91Qll on the screw rod 43 and the feed vise 11.

The stopper 45 is for restricting the movement of the feed vice 11 in the direction of the support O-ra 33.
5 is equipped with a limit switch 47 that senses when the feed vise 11 comes into contact with the stopper 45.

With the above configuration, the workpiece W is placed on the plurality of support rows 529 provided on the support frame 9, and the tip of the workpiece W is placed in a position where it comes into contact with the side surface of the bandsaw blade 19 by the feed vice 11 and the feed vice moving cylinder 39. The material is fed to the point where it is clamped and fixed by the main body vise 7.

At this time, the feed vise 11 is at the closest position to the main body vise 7 and is releasing the workpiece W.

Next, after positioning and fixing the stopper 45 of the stroke adjustment device 13 at a predetermined position, the workpiece W is transported n times by operating the feed vise device 11.

That is, the saw blade housing 17 of the cutting section 5 is rotated upward, and the feed vice 11 is moved in a direction away from the main vice 7 by the operation of the feed vice moving cylinder 39.

The feed vise 11 comes into contact with the stopper 45 and moves MAi
It is sensed by the limit switch 47. The feed vice 11 is operated to clamp the workpiece W, and at the same time, the main body vice 7 is released.

Next, the workpiece W is fed by operating the feed vice moving cylinder 39 in the opposite direction. When the limit switch 27 attached to the main body vise 7 detects that the feed vise 11 has reached the material feeding end, the main body vise 7 performs a clamping operation for the workpiece W, and at the same time, the feed vice 11 performs a releasing operation for the workpiece W. It will be done. Below, similarly, the feeding material is n
When repeated times, the feeding by the feeding vise 11 is completed and the cutting process is started.

The feed vise 11 includes a fixed vise 33 and a movable vise 35.
The workpiece W is clamped and unclamped. A piston rod 49 is integrally provided in the movable vise 35, and the piston rod 49 is telescopically attached to the hydraulic cylinder 37. A workpiece width detection device 51 for detecting the width of the workpiece W by moving the piston rod 49 in the left-right direction in FIG. 4 is attached to a support frame 53 that supports the feed vice 11.

More specifically, as shown in FIG. 3, the piston rod 49 is supported by a support frame 53 in a direction perpendicular to the plane of the paper. A casing 57 of a workpiece width detection device 251 is rotatably supported on the support frame 53 with the bin 55 as a fulcrum. This casing 57
A rotatable shaft 61 is supported inside via a plurality of bearings 59.

A contact roller 63 is attached to the tip of the shaft 61, and an encoder 67 is attached to the rear end of the shaft 61 via a coupling 65. A spring 69 is interposed between the lower rear side of the casing 57 and the support frame 53 and is constantly biased upward.

With the above configuration, the contact roller 63 is connected to the spring 6
Since the piston rod 49 is in contact with the outer circumferential surface of the piston rod 49 using the pin 55 as a fulcrum with a biasing force of 9, the piston rod 4
9 moves in a direction perpendicular to the paper plane in FIG. 3, the contact roller 53 rotates and the piston rod 4
9, that is, the amount of movement of the movable vice 35 is detected. The amount of movement of the movable vise 35 is accurately detected by an encoder 67 interlocked with the contact roller 53.

More specifically, as shown in FIG. 1, the encoder 67 of the work width detection device 51 is connected to a counter 71, and this counter 71 is connected to a comparator 75 via an arithmetic processing device 73. ing. The comparator 75 is connected with a set value memory 77 in which the work width Lo of the work W is stored in advance, and an NCi device 9 that controls the horizontal band saw machine 1 in general.

With the above configuration, the distance 1+ from the tip of the fixed vise 33 to the tip of the movable vise 35 is set in advance, and by operating the hydraulic cylinder 37 from this distance 11L+, the movable vise 35 is connected to the fixed vise via the piston rod 49. Move towards the 35 side. The amount of movement of this movable vise 35 is determined by the number of rotations of contacts 0-563.
7 and counted by counter 71. Based on the count counted by this counter 71, the processing unit 73 calculates the movement Tha L2 of the movable vise 35, and also processes the actual distance 1111L (-Ls -12) from the tip of the fixed vise 33. do.

This actual distance is taken into the comparator 75, and the width Lo of the workpiece W is stored in advance in the set value memory 77.
has already been taken into the comparator 75, so the comparison WA7
In step 5, Lo and L are compared. That is, comparator 75
If it is L-Lo, the tip of the movable vise 35 comes into contact with the workpiece W and is clamped, and it is determined that there is a workpiece.

Further, if L<Lo in the comparator 75, it is determined that the workpiece W is not between the fixed vise 33 and the movable vise 35, and there is no workpiece. If L>Lo, this indicates that the tip end position of the movable vice 35 has not yet reached the clamp position.

As an example of determining the presence or absence of the workpiece W, FIG.
1 shows the presence/absence of the workpiece W when the workpiece W is being transported. In Figure 2, the clamp position (L-
Lo), for example, when an excess of ΔL (=L-Lo) is detected, it is determined that there is no actual workpiece.

In this way, the workpiece width detection device 51 provided on the feed vise 11 automatically and accurately detects the presence of a workpiece when L=Lo, and the workpiece W is clamped between the fixed vise 33 and the movable vise 35. The material is fed to the cut section 5 side and can be cut to a desired length by the band saw blade 19. In addition, the workpiece width detection device 51 can automatically and accurately detect that there is no workpiece when L<Lo. In this case, by transmitting a signal indicating that there is no workpiece to N C@lf 79, an instruction to discharge the remaining material after cutting or to supply the next workpiece W is issued, and the next processing is performed. It turns out.

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, in this embodiment, the movement amount of the telescopic piston rod 49 attached to the fluid cylinder 37 is detected by the contact roller 63 and the encoder 67 as the workpiece width detection device M51. and binions, wires, ropes,
Detection may also be done by attaching an encoder to a linear scale, belt, chain, etc.

When storing the width Lo of the workpiece W in the set value memory 77, the tip of the movable vise 35 is brought into contact with the workpiece W to detect and input the actual width. Further, the width of the workpiece W may be input in advance, or the width of the workpiece W may be detected and inputted using a saw blade guide.

Furthermore, although this embodiment has been described using the horizontal bandsaw machine 1 as an example of a cutting machine, other cutting machines such as a vertical bandsaw machine, a circular saw machine, a hacksaw machine, etc. can also be applied.

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, when cutting a workpiece at the cutting section of a cutting machine, the workpiece is clamped by a feeding vise, and the workpiece is not clamped. The cut workpiece is sent to the cutting side. At this time, the presence or absence of the workpiece is detected by a workpiece width detection device provided on the movable vice of the material feeding vice. That is, by bringing the movable vice of the feed vise closer to the fixed vice, the actual distance from the fixed vice is detected each time by the workpiece width detection device. This detected actual distance is compared with the workpiece width Lo stored in the set value memory using a comparator.
If L=Lo, it is determined that there is a workpiece, and L<
If it is Lo, it is determined that there is no workpiece, so the presence or absence of the workpiece can be detected automatically and accurately. Further, when it is determined that there is no work, a no-work signal is transferred to the NG device, and the next processing can be carried out smoothly.

[Brief explanation of the drawing]

Fig. 1 is a control block diagram showing the main parts of the present invention and detects the presence or absence of a workpiece with a workpiece width detection device, Fig. 2 is a diagram showing the presence/absence of a workpiece in relation to the number of feeds of the feed vise, and Fig. 3 4 is an enlarged sectional view taken along the line-m in FIG. 4, and FIG. 4 is a plan view of a horizontal bandsaw machine as a cutting machine according to an embodiment of the present invention. 1...Horizontal band rjAM (cutting machine) 5 cutting section 11.
・Feed vise 33 ・Fixed vise 35 ・
...Movable vise 37...Hydraulic cylinder 49...Piston rod 51...Work width detection device 63...Contact roller 67...Encoder 71...Counter 73...Calculation processing@location 75. ... Comparator 77
...Setting value memory 79...NC@Oki agent Patent attorney Hidekazu Miyoshi Figure 3 Figure 4

Claims (2)

[Claims] (1) When feeding a workpiece to a cutting section using a feed vise equipped with a fixed vise and a movable vise, when clamping the workpiece by bringing the movable vise closer to the fixed vise,
Workpiece presence/absence detection in a cutting machine, characterized in that a workpiece width detection device provided on the movable vise determines a distance L from the fixed vise, and compares it with a preset workpiece width L_0 to detect the presence or absence of a workpiece. Method. (2) A feeding vise having a fixed vise and a movable vise,
A workpiece width detection device installed in the movable vice of the feed vise to detect the distance L from the fixed vise, a setting value memory for storing a preset actual workpiece width L_0, and a setting value memory for storing the actual workpiece width L_0 set in advance. A workpiece presence/absence detection device for a cutting machine, comprising: a comparator that compares an actual workpiece width L_0 being detected with a distance L detected by the workpiece width detection device.