JP2921714B2 - Material positioning device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material positioning device for accurately feeding a workpiece to a processing position in a processing machine such as a cutting machine or a drilling machine.

[0002]

2. Description of the Related Art Conventionally, in a band sawing machine which is a cutting machine as a processing machine, for example, a first work feeder, a pair of fixed jaws and a movable jaw provided near an end of the first work feeder are provided. And a pair of fixed-side jaws and moving-side jaws further forward of a band sawing machine provided on the front side of the first workpiece feeder, and the workpiece is pulled in the material feeding direction to perform fixed-size positioning. The material positioning device includes a front vise for sizing positioning, a second work feeder that drives the front vise in the material feeding direction, and a measuring device that measures a work feed amount in the second work feeder. Was composed.

[0003]

In the material positioning device known in the prior art, the leading end of the work fed by the first work feeder passes through the opened main body vise and is closed. The origin is positioned by being brought into contact with the front surface of the front vise for the fixed size positioning.

[0004] Next, in order to cramp the work and move it by a fixed size, first, a front vise for fixed size positioning is opened.
Then, after a slight retreat movement in the material feeding direction to obtain a clamp margin, the workpiece is closed and the work is clamped.
Therefore, in order for the front vise for fixed-size positioning to clamp the work, an opening movement and a retreat movement are required, which causes a loss time.

Further, during the above-described opening, retreating and opening operations, the work whose origin has been positioned moves. To prevent this, the main body vise must be closed and clamped in advance. There must be. Therefore, the next time the front vice for sizing the workpiece, which has clamped the workpiece, is moved by the predetermined dimension, the clamped main body vise must be opened.

Therefore, a loss time for closing and opening the main body vise also occurs here.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an efficient material positioning apparatus which has no loss time when clamping a work whose origin has been positioned.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a fixed-side work clamp member having a butting portion for abutting a leading end of a sent work and a clamping surface; A workpiece clamping member for movably moving a movable workpiece clamp member having a clamp surface for clamping a movable workpiece corresponding to the workpiece clamp member in the material feeding direction; A material positioning device having a configuration including a measuring device for measuring.

[0009]

By adopting the material positioning apparatus of the present invention, the leading end of the fed work is brought into contact with the abutting portion provided on the fixed-side work clamp member and the origin is positioned. Then, the work clamp member on the moving side is immediately closed and the front end portion of the work is clamped by both work clamp members.

[0010] Next, the work is further pulled by the work clamping device in the material feeding direction, and is moved and fixed by a dimension required for processing. This fixed-size movement
The measurement is accurately performed while the movement amount is measured by the measuring device provided in the work clamp device.

As described above, since the work clamp member is clamped immediately after the work is positioned at the origin, there is no loss time and there is no risk that the work will shift due to this clamping operation. There is no need for activation, and this activation time is reduced.

[0012]

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

First, a band saw machine 1 as a cutting machine will be described with reference to FIGS. A roller conveyor (work feeder) 3 is provided for feeding the workpiece W with the workpiece W placed in front of the feed direction.
And driven by a belt or an idler.
The roller conveyor 3 is provided with a side guide 3a for smoothly feeding the work W.

At the end of the roller conveyor 3,
A main body vise 7 for clamping and processing the work W is provided. The main body vise 7 is a fixed jaw 7a.
And a moving jaw 7b which is opened and closed by a cylinder 9.

At a position slightly in front of the main body vise 7 is provided a band saw blade (working member) 11 which can be moved up and down.
Is formed. Immediately before the cut surface T, a front vise 13 for sizing positioning, which is movable in the material feeding direction as a material positioning device, is provided, and is moved in the material feeding direction by a servo cylinder. I have. In addition, the front vise 13 for the fixed-size positioning has a butting portion 17a for abutting a tip of a work W as a work clamping device to perform origin positioning, and a clamp surface 17b for clamping the work. Moving jaw 21 having a fixed jaw 17 and a clamp surface which is opened and closed by a cylinder 19
Consists of Note that a limit switch 23 is built in the fixed jaw 17 so as to detect that the tip of the work W has come into contact with the abutting portion 17a.

Further, the front vise 13 for positioning the fixed size is provided.
In addition to being driven by the servo cylinder 15, a rotary encoder 25 is attached to a lower portion for feeding back a position. The pinion 27 attached to the rotary shaft of the rotary encoder 25
The measuring device 31 is engaged with the rack 29 fixed to the frame to measure the work feed amount. The measurement signal of the measurement device 31 is transmitted to the NC control device 3
3 to control the servo cylinder 15.

When the work W is first carried into the roller conveyor 3 from another conveyor, or carried by a chain or the like from above and loaded thereon, the drive motor 5 is rotated. You. Then, since the roller conveyor 3 rotates via a belt or an idler, the work W moves forward along the side guide 3a (to the right in FIGS. 1 and 2).
Transported to Since the work W is guided by the side guide 3a, the work W is continuously conveyed along the clamp surface of the fixed jaw 7a of the opened main body vise 7.

Eventually, the front end of the work W passes through the main body vise 7 and the rising band saw blade 11, and the clamp surface 17 provided on the fixed jaw 17 of the front vise 13 for sizing positioning.
Enter along b. Then, it comes into contact with the abutting portion 17a. This contact is sensed by the limit switch 23. This means that the origin of the work W has been positioned.

Then, the cylinder 19 is actuated immediately, the moving jaw 21 is closed, and the work W is clamped by the front vise 13 for positioning the fixed size. Then, the servo cylinder 15 is actuated, and the work W is further moved by a fixed size,
Fixed size positioning is performed.

When the fixed-size positioning vise 13 is moved, the pinion 27 meshing with the rack 29 fixed to the frame is rotated, and the rotary encoder 25 is rotated.
Is rotated, the signal as the measuring device 31 is fed back to the NC control device 33 to control the servo cylinder 15. Therefore, the fixed size positioning is performed accurately. By the way, the feed amount M of the fixed size positioning vise 13 is shown in FIG.
In the case where the abutting portion 17a positioned at the origin coincides with the cutting surface T of the band saw blade 11, if the desired cutting length is D in consideration of the cutting margin δ of the band saw blade 11, then M = D +
δ / 2, but if the abutment portion 17a at the time of positioning the origin is separated from the cut surface T by a distance C, the feed amount M
Is calculated by M = D− (C−δ / 2). In any case, the distance C is a constant value specific to the machine, and the cutting margin δ is also a fixed value.
Is calculated in the NC control device 33 and the servo cylinder 1
5 is controlled.

Next, when the front vice 13 for sizing is clamped by the servo cylinder and moved by the feed amount M by the servo cylinder, the moving jaw 7b of the main body vise 7 is closed by the cylinder 9 to move the fixed jaw 7a. The work W is clamped to the main body vise 7 in cooperation with the above.

Then, the moving jaw 21 of the pre-size positioning vise 13 is opened by the cylinder 19 and lowered while rotating the band saw blade 11 to cut the workpiece W by the predetermined size.

As described above, by employing the material positioning device 1 of the present invention, the workpiece W is cut to a fixed size.

As described above, by employing the material positioning device 1 of the present invention, the tip of the work W comes into contact with the abutting portion 17a provided on the fixed jaw 17 of the fixed size positioning vise 13. When the origin is positioned and the moving jaw 21 can be immediately closed by the cylinder 19, the loss time can be eliminated.

Since the opening and closing operation of the main body vise 7 does not need to be performed during the clamping operation of the fixed-size positioning vise 13, efficient work can be performed without any loss time from this surface.

The shape of the abutting portion 17a and the clamp surface 17b provided on the fixed jaw 17 of the material positioning vise 13 is a single-step key-shaped notch in the embodiment, but is shown in FIG. As shown in FIG.
In addition to the provision of a, the corresponding moving jaw 21 can be provided with a corresponding recess 21a. Moreover, in this case, a thin work W or a thin work W can be clamped regardless of the width of the abutting portion 17a.

Further, as shown in FIG. 4, it is possible to cope with the case where the abutting portion 17a is formed in a pin-like shape and is provided so as to be able to protrude and retract from the clamp surface 17b by a single-acting cylinder 17c. As a modification, the same effect can be obtained even if the single-acting cylinder 17c swings a swingable plate-shaped abutting portion 17a (not shown) so as to be able to protrude and retract from the clamp surface 17b. It is.

Now, the tip of the work W is
In the above description, the limit switch 23 incorporated in the fixed jaw 17 is used to detect that the home position is completed by contacting the a.
In addition, as shown in FIG. 5A, a light beam 35a of a photoelectric switch 35 having a light emitting unit and a light receiving unit is provided in front of a front vise 13 for fixed size positioning, or as shown in FIG. 5B. It is also conceivable to provide the light beam 35a at the abutting portion 17a.

It should be noted that the present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes. For example, in this embodiment, an example in which the material positioning device 1 is applied to a band saw cutting machine has been described, but the material positioning device 1 can be sufficiently applied to a drilling machine or the like. Although the first work feeder is a roller conveyor in the embodiment, the first work feeder can also be adapted to a feed vise movable in the material feeding direction.

[0030]

As can be understood from the above description of the embodiment, as soon as the leading end of the sent work comes into contact with the abutting portion and the origin is positioned, the moving side work clamp member is removed. Since the work clamp is performed by closing, the time loss can be reduced as compared with the conventional case.

Further, since the work clamping device is provided with a measuring device, the feed amount for the fixed size positioning can be determined accurately and quickly.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of an embodiment according to the present invention.

FIG. 2 is an explanatory sectional view taken along line II-II in FIG.

FIG. 3 is an explanatory view of another embodiment of the butting portion.

FIG. 4 is an explanatory view of still another embodiment of the butting portion.

FIG. 5 is another explanatory view as a work origin position detecting means.

[Explanation of Signs] 1 Band sawing machine (cutting material) 3 Roller conveyor (first work feeder) 13 Front vise for fixed size positioning (material positioning device) 15 Servo cylinder 17 Fixed jaw (Fixed work clamp member) 17a Butt 17b Clamping surface 21 Moving jaw 31 Measuring device W Work

Claims (1)

(57) [Claims] 1. A fixed-side work clamp member having an abutting portion for abutting a leading end of a sent work and a clamp surface, and a clamp for clamping a movable work corresponding to the fixed-side work clamp member. A work clamping device for movably moving a work clamp member on the moving side having a surface in a material feeding direction, and a measuring device for measuring a work feed amount in the work clamp device. .