JPH0551404B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to various types of cutting machines, such as band saws, in which the cutting surface of the cutting tool is fixed at a fixed position relative to the base. The present invention relates to a device for feeding a material by a fixed distance to a cutting position in order to obtain a set cutting length in a cutting machine.

<Prior Art> As a sizing device for the above-mentioned type of cutting machine, for example, a band saw, a device as shown in FIG. 7 has conventionally been common. That is, with respect to the main vice 72 provided on the base 71 in close proximity to the cutting surface formed by being fixed at a fixed position with respect to the base 71, on the rail 73 laid in the material feeding direction. The sizing vise 74, which can be slid freely, is moved forward and backward by the cylinder 75, and after the sizing vise 74 is moved back by a distance corresponding to the cutting length, the material W is held and moved to a certain forward end. In this method, the material is fed by advancing the material up to a certain point.

<Problems to be Solved by the Invention> According to the conventional sizing device as described above, especially when the weight of the material W is large, the frictional resistance between the material W and the table etc. is caused by the sizing vise 74. The material clamping force may exceed the material clamping force, and when moving forward while clamping the material W with the sizing vise 74, the material
This often caused slippage between the sizing vise 74 and the sizing vise 74, resulting in sizing defects.

In order to prevent such sizing defects,
Hitherto, Utility Model Publication No. 61-40430 has been proposed. In this proposal, a detection body is made to elastically protrude from the material clamping surface of the sizing vise in the clamping direction, and this detection body can be freely rotated around an axis perpendicular to the material feeding direction, and at a rotational neutral position. The detection body is supported elastically, and the rotation of the detection body is configured to be detected by a detector such as a proximity switch, thereby detecting the occurrence of slippage between the two when the material is clamped by the sizing vise. However, according to this proposal, it is possible to automatically stop operation in the event of slippage, which prevents sizing defects from occurring, but has the disadvantage that production will remain at a standstill. be.

In this way, band saws and other types of cutting machines with fixed cutting surfaces have traditionally detected the presence or absence of slippage in the specified dimensions of the material to prevent sizing defects. However, there is no device that can automatically continue cutting without causing sizing defects even if slipping occurs.

An object of the present invention is to provide an automatic sizing device for a cutting machine that does not cause sizing defects even if slippage occurs between the sizing vise and the material, and does not reduce productivity.

<Means for Solving the Problems> The configuration for achieving the above object will be explained with reference to the basic conceptual diagram shown in FIG. A cutting machine fixed at a fixed position is engaged with measuring means a, moves backward by an amount based on the set cutting length, and then moves forward to a predetermined advance stop position while holding the material, thereby cutting the material. A sizing vise b that feeds the material to the processing surface, a sizing control means c that inputs the output of the length measuring means a and controls the operation of the sizing vise b, and is rotatably supported by the sizing vise b. a rotating body d that contacts the material held by the sizing vice b and rotates in response to the relative displacement between the material and the sizing vice b, and a sensor that detects the amount of rotation of the rotating body d. e, and a control correction means f which inputs the output of the sensor e and gives a correction command to the sizing control means c in order to change the forward stop position of the sizing vise b by an amount corresponding to this input. Characterized by.

<Function> If slipping occurs between the material and the sizing vise b when the material is clamped and transported by the sizing vise b, when the sizing vise reaches the specified forward stop position,
A sizing error occurs by the total slip amount Δ between the strokes. By detecting this total slip amount Δ using the rotating body d and the sensor e and shifting the forward stop position of the sizing vise b from the specified position by that amount, error-free measurement is always achieved regardless of whether slip occurs or not. It becomes possible to send by a certain length.

<Example> Examples of the present invention will be described below based on the drawings.

FIG. 2 is a diagram showing both a plan view of the main parts of the mechanical part of the embodiment of the present invention and a system block diagram of the control section. FIG. 3 is a side view of the mechanism, showing an example in which the present invention is applied to a bandsaw machine M.

Main and sub columns 2 arranged upright on the base 1,
A saw frame 4 that is slidable along a saw frame 3 supports a band saw blade 5 and its travel drive device (not shown), and the band saw blade 5 is driven by a feed cylinder (not shown). is given a vertically downward cut. The cutting locus of this band saw blade 5 is shown as a cutting surface S.

A main vice 6 is disposed on the base 1 in close proximity to the cutting surface S, and the main vice 6 opens and closes in a direction perpendicular to the material feeding direction by a cylinder 6a, and cuts the material to be cut. W can be held and released.

A sizing vise 7 is provided behind the main vise 6 and can be opened and closed in the same direction as the main vise 6 by a cylinder 7a. It is slidably supported on the rail 7b, and can be moved toward and away from the main vise 6 by driving the sizing cylinder 7c.

A rack 8 is fixed to the sizing vise 7,
The rack 8 meshes with a pinion 9 rotatably supported on the base 1, and a rotary encoder 10 is attached to the shaft of the pinion 9. Thereby, the amount of advance and retreat of the sizing vise 7 is replaced by the amount of rotation of the pinion 9, which can be detected by the rotary encoder 10.

As shown in FIG. 4 is an enlarged view of the main part of FIG. 2, and FIG. A slip amount detection mechanism consisting of a rotary encoder 12 and the like is installed.

That is, the stationary side vise jaw 7d has a cavity that opens toward the material clamping surface, and a support 13 that is slidable in the material clamping direction is fitted into this cavity. And this support 1
3, a rotating body 11 rotatable about a vertical axis is supported by bearings 14, 14. A rotary encoder 12 is attached to the rotating shaft of the rotating body 11, and the amount of rotation of the rotating body 11 can be detected.

The support body 13 is always biased toward the movable side vice-jo 7e by a compression coil spring 15, and in a free state without clamping the material W, the rotary body 11
is configured to slightly protrude from the material clamping surface of the stationary side vice jaw 7d.

The control unit 20 is used to control the band saw machine body together with the sizing device described above, and is mainly composed of a microcomputer, including a CPU 2 that executes programs and controls each peripheral device.
1. ROM2 in which the program described below is written
2. An area has been set to store input data such as cutting length, calculation results by CPU 21, etc.
It is equipped with a RAM 23, a keyboard 24 for inputting cutting lengths, etc., and an input/output interface 25 for connection with external equipment.

The input/output interface 25 includes output signals from a rotary encoder 10 for detecting the amount of forward/backward movement of the sizing vise 7 and a rotary encoder 12 for detecting the amount of material slippage during sizing.
And output signals from various sensors within the bandsaw machine body are input. In addition, input/output interface 2
5 outputs drive control signals for the cylinders 6a, 7a and sizing cylinder 7c, and control signals for various actuators in the band saw machine body. In addition,
The drive control signals to the cylinders 6a, 7a and the sizing cylinder 7c are actually supplied to each directional control valve in the hydraulic circuit that drives them.
In FIG. 2, illustration is omitted.

FIG. 6 is a flowchart showing the program written in the ROM 22, and the operations and effects of each part will be explained below with reference to this diagram.

Prior to automatic operation, first, the cutting length l and the cutting distance t by the band saw blade 5 are input using the keyboard 24 (ST1). Also, manually operate the sizing vise 7 to align the tip of the material W so that it is on the cutting surface S, close the main vise 6, and
(ST2). Next, the sizing vise 7 is opened and moved to the original position, that is, the specified forward stop position 7 (ST3). This origin position is set slightly behind the forward limit of the sizing vise 7, and is detected by the contact output of a detector P such as a limit switch or a proximity switch installed at the corresponding position on the base 1. .

Now, when automatic operation is started, first, the sizing vise 7 moves back from the origin position by the sum (l+t) of the cutting length l and the cutting allowance t (ST4). next,
The sizing vise 7 closes and clamps the material W (ST5), the main vise 6 opens, the sizing vise 7 starts moving forward (ST6), and the amount of advance is detected by the rotary encoder 10.

Here, when the sizing vise 7 is closed and the material W is clamped, the rotating body 11 is pushed to a position along the clamping surface of the fixed side vise 7d,
As a result, the rotating body 11 is elastically pressed against the material W. When a relative displacement, that is, a slip occurs between the sizing vise 7 and the material W in this state, the rotating body 11 rotates by an angle corresponding to the amount of slip.

The amount of rotation of the rotating body 11 from the moment when the sizing vise 7 clamps the material W in ST6 is detected moment by moment by the rotary encoder 12 and accumulated.
The cumulative value until the sizing vise 7 stops is converted into a total slip amount Δ (ST7). The sizing vise 7 is
If no slippage occurs between the material W, that is, Δ
If is 0, it moves forward by (l + t), so the home position becomes its forward stop position. However, if a slip Δ occurs, it moves forward by (l + t + Δ), and the forward stop position is Δ in front of the home position. (ST8,
ST9). As a result, regardless of whether or not there is slippage between the sizing vise 7 and the material W, or whether the amount of slippage is large or small, the material W will always move forward by (l+t), and then the main vise 6 will be closed and cutting will be performed. (ST10) A cut piece having a cut length l is obtained. Then, steps from ST4 onwards are repeated until the operation termination condition, such as reaching a preset number of cuts, is met, and when the above condition is met, the operation is stopped (ST11).

The above-mentioned slip Δ is actually a small size, but if the material has a large slip, the position of the detector P at the origin may be shifted to the rear.

Note that the position control of the sizing vise 7 is performed by an incremental method,
Of course, any of the absolute value methods may be used.
Further, as an embodiment other than the present invention, a stopper is provided at a position corresponding to the origin position, and the sizing vise 7 is brought into contact with this stopper to set the forward end, and this stopper is adjusted according to Δ. It may be configured to be displaced back and forth. Furthermore, it goes without saying that the present invention can be applied to various types of saw machines other than band saw machines and other cutting machines in which the surface to be cut by a cutting tool is fixed.

<Effects of the Invention> As explained above, according to the present invention, a rotatable body is disposed in the sizing vise, and the rotating body is connected to the sizing vise and the material held between the sizing vise. This is because the sizing vise is configured to rotate by an amount corresponding to the amount of relative displacement between the sizing vise, detect the amount of rotation with a sensor, and change the forward stop position of the sizing vise by an amount corresponding to the detected value. , without using a particularly complicated mechanism, and therefore without significantly improving existing equipment, to determine whether or not slipping occurs between the sizing vise and the material during sizing feeding, at low cost.
Alternatively, regardless of the magnitude of the amount of slippage, the material can always be fed by a set length, and there is no risk of sizing defects occurring. Furthermore, even if slippage occurs, cutting continues without stopping automatic operation, so there is no reduction in productivity.

[Brief explanation of drawings]

Figure 1 is a basic conceptual diagram showing the configuration of the present invention;
The figure is a plan view of the mechanism part of the embodiment of the present invention and the control unit 2.
Fig. 3 is a side view of the mechanism, Fig. 4 is an enlarged view of the main part of Fig. 2, and Fig. 5 is the main part seen from the rear in the material feeding direction. FIG. 6 is a flowchart showing a program written in the ROM 22, and FIG. 7 is an explanatory diagram of a conventional sizing device. 1...Base, 5...Band saw blade, 6...Main vice,
7... Sizing vise, 7a... Cylinder, 7b...
Rail, 7c... Cylinder for sizing, 7d... Fixed side vice-jo, 8... Rack, 9... Pinion, 10... Rotary encoder, 11... Rotating body, 12... Rotary encoder, 13... Support body , 15... compression coil spring, 20... control block.

Claims (1)

[Claims] 1. In a cutting machine in which the cutting surface of the cutting tool is fixed at a fixed position on the base, the cutting tool engages with the length measuring means and retreats by an amount based on the set cutting length, and then the material is clamped and cut into a predetermined position. a sizing vise that feeds the material to the cutting surface by advancing to a forward stop position; and a sizing control means that inputs the output of the length measuring means to control the operation of the sizing vise. , a rotating body rotatably supported by the sizing vise and rotating in response to relative displacement between the material and the sizing vise by coming into contact with the material held between the sizing vise; and the rotating body. a sensor for detecting the amount of rotation of the sizing device; and a control correction device that inputs the output of the sensor and gives a correction command to the sizing control device to change the forward stop position of the sizing vise by an amount corresponding to the input. A sizing device for a cutting machine characterized by comprising: