JP2022045845A - Workpiece positioning clamp - Google Patents

Abstract

To provide a workpiece positioning clamp which reduces a dead space near a workpiece when pressing a processing object (a workpiece) in a machine tool or the like, and which, for example, in robot welding using a torch, positions a workpiece so as to minimize disturbance in a torch traffic line and in an approach by the torch to a weld zone.SOLUTION: A toggle clamp 1 comprises: a handle 4 provided in a rotatable manner on a longitudinal material disposed upright on a mounting surface; and arms 5 and 6 that rotate or move linearly in a workpiece direction in accompany with rotation of the handle, and that are locked using a toggle mechanism. A workpiece positioning clamp provided with the toggle clamp includes an abutting part 8b therein for contacting and pressing a workpiece, that can be vertically rotated and positionally fixed at a tip of the arms.SELECTED DRAWING: Figure 1

Description

INDUSTRIAL APPLICABILITY The present invention reduces the dead space near the work when holding down the object to be machined (work) in a machine tool or the like. The present invention relates to a work positioning clamp that positions a work so as not to prevent it.

As a conventional work positioning clamp, as shown in FIG. 1, a toggle clamp 1 (Non-Patent Document 1) is known.

The toggle clamp 1 includes a mounting member 2, a left connecting member 3, a right connecting member 3c, a handle 4, a left arm 5 and a right arm 6, an upper front / rear positioning 7, a lower front / rear positioning 7a, and a holding member 8. It is an auxiliary tool for positioning the work by pressing it against a jig dedicated to positioning the work when processing the work, for example, during welding.

The mounting member 2 is a workbench for processing a work, a portion for fixing the toggle clamp 1 to a holding jig, and a mounting surface 2a having a hole 2b for passing a screw (not shown) to be screwed to the workbench and a mounting surface. It is composed of a vertical member 2c erected from 2a. Here, the holes 2b are drilled at the four corners, but one hole 2b may be provided on each side of the vertical member 2c.

One end of the left connecting member 3 is rotatably connected to the end of the vertical member 2c by the first screw 3a, and the left connecting member 3 is rotatably connected to the handle 4 that grips the other end by the second screw 3b. The vertical member 2c and the handle 4 are sandwiched, the right connecting member 3c is arranged at a position opposite to the left connecting member 3, and the first screw 3a and the second screw 3b are rotatably connected. The handle usually comprises a cover 4a. It may be a handle including the cover 4a.

The left arm 5 and the right arm 6 are L-shaped plates that are arranged so as to sandwich the vertical member 2c and the handle 4, and the tips of the left arm 5 and the right arm 6 can be rotated to the vertical member 2c by the third screw 5a. It is connected, and the tip is rotatably connected to the handle 4 by the fourth screw 5b on the tip side on the non-grasping side by the second screw 3b above the third screw 5a in FIG. In addition to the left and right arms, there is also a single plate and a single rod arm. Here, a structure that rotates or moves linearly with the rotation of the handle 4 without being restricted by the shape and number of the arms is simply referred to as an arm.

The vertical / front / rear positioning 7 and 7a are for positioning the pressing member 8 in front of and behind the handle 4 directions in contact with the work. The position can be moved in the front-back direction. The positions are fixed on the left and right arms 5 and 6 by the function of the pressing member 8 described later.

The pressing member 8 is located here with a screw and two nuts, and is located at the lower end of the shaft 8a and the shaft 8a having a screw thread for inserting the vertical and front / rear positioning 7 and 7a, and touches the work directly to directly touch the work. The contact portion 8b (head), which is the part to be pressed, and the shaft 8a are screwed together, and the position of the contact portion 8b (height (dashed-dotted double-dashed arrow C)) due to the rotation of the shaft 8a, the work when the toggle mechanism is locked. It is composed of upper nuts 8c and lower nuts 8d located above and below the vertical front-rear positioning 7 and 7a, which adjust the pressing force on the vertical and front-rear positioning 7 and 7a and fix the positions of the left and right arms 5 and 6 of the vertical front-rear positioning 7 and 7a.

The toggle mechanism is composed of the rotating handle 4, the left and right connecting members 3, 3c, and the left and right arms 5 and 6 (dashed-dotted double-headed arrow B). The toggle mechanism is a mechanism that reverses the direction of the reaction force after a certain dead center in the operating process and self-locks (Non-Patent Document 1).

In FIG. 1, in a handle horizontal type downward pressing type, the handle 4 is positioned in the lateral direction and the pressing member 8 presses and locks the work (not shown). On the other hand, by grasping the handle 4 by hand and rotating it in the vertical direction in FIG. 1, the holding member 8 is unlocked. There is also a handle vertical downward press type that locks the handle in the horizontal direction and unlocks it in the vertical direction. Further, there is also a horizontal push type of the arm (Non-Patent Document 1). Here, the holding devices provided with these toggle mechanisms are collectively referred to as a toggle clamp.

The conventional toggle clamp has no problem in holding the work, but for example, the torch moves during automatic welding (CO ₂ arc welding, etc.) by the torch of the welding robot near the left and right arms 5 and 6 and the contact portion 8b. It can interfere with the wire and interfere with the approach of the torch weld. Then, the target welded portion cannot be welded in one welding process. Therefore, it is inefficient and costly because it requires an increase in the welding process, a holding clamp, and an additional jig.

On the other hand, in a small work with a small space to be pressed, the conventional screw head contact portion 8b cannot be appropriately pressed, and the work processing accuracy, for example, welding accuracy is low, the quality varies, and the yield deteriorates. Additional work such as repair was required, and the high cost of the processing process was a problem.

https://jp.misumi-ec.com/tech-info/categories/technical_data/td06/x0271.html

Therefore, the present invention reduces the dead space in the vicinity of the workpiece when pressing the workpiece (workpiece) in a machine tool or the like. For example, when robot welding with a torch, an approach to the torch flow line and the welded portion of the torch is adopted. It is an object of the present invention to provide a work positioning clamp that positions a work piece so as not to disturb it as much as possible.

The present invention is to solve the above problems.
(1)
In a toggle clamp provided with a handle rotatably provided on a vertical member erected on a mounting surface and an arm that rotates or linearly moves in the work direction with the rotation of the handle and is locked by a toggle mechanism.
A work positioning clamp comprising a contact portion that can rotate up and down and fix a position at the tip of the arm to contact and press the work.
(2)
The arm is provided with a stopper that hinders the vertical rotation of the contact portion.
The rotation stop position of the contact portion can be adjusted by the position of the stopper.
The work positioning clamp according to (1), wherein the position of the contact portion is fixed and the pressing force of the contact portion on the work can be adjusted.
(3)
The work positioning clamp according to (1) or (2), wherein the contact portion has a tapered shape.
(4)
The handle assists the release of the lock of the toggle mechanism by the contraction of the spring.
The work positioning clamp according to any one of (1) to (3), wherein the spring is passed to the arm and the mounting surface.
(5)
A work positioning clamp according to any one of (1) to (4), wherein the work positioning clamp is for holding a work during welding of a robot torch.
It was made into the composition of.

Since the present invention has the above configuration, it is possible to reduce the dead space in the vicinity of the work when holding down the object to be machined (work) in a machine tool or the like. For example, when robot welding with a torch, it becomes possible to reduce the obstruction to the torch flow line and the approach of the torch to the welded portion.

It is a partial perspective perspective view of a conventional toggle clamp. Some transparent lines (dotted lines) are added. It is a substantially side photograph at the time of locking of the work positioning clamp of the 1st Embodiment of this invention. Some transparent lines (dotted lines) are added. It is a side photograph at the time of unlocking of the work positioning clamp of the first embodiment of this invention. It is a schematic diagram of use as a welding assisting tool of the work positioning clamp of 1st Embodiment of this invention. It is a front schematic diagram of the work positioning clamp of the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the following examples.

As shown in FIG. 2, in the conventional toggle clamp 1, the work positioning clamp 11 of the present invention rotates up and down to the tips of the left and right arms and has a contact portion 14a that can be positioned and fixed in contact with the work. Be prepared. Since the same names and symbols as those of the conventional toggle clamp 1 have the same structure and function, the conventional toggle clamp 1 can be referred to, and the description thereof will be omitted here. The right side view of the work positioning clamp 11 is the same as the left side view of FIG.

Specifically, the work positioning clamp 11 is changed to the left arm 12 having a hole at the tip of the left arm 5 and the right arm 13 having a hole at the tip of the right arm 6 in the toggle clamp 1. An upper screw 13c to be inserted into these holes, an upper nut 13d to be screwed into the upper screw 13c, and a rod-shaped abutting portion 14a rotatably attached to the upper screw 13c (dashed-dotted double-headed arrow D) and fixed in position. A presser member 14 made of the same material is provided. If the upper screw 13c is strongly screwed, the position of the contact portion 14a can be fixed. In addition, in order to fix the position more reliably and firmly, the pressing force adjusting mechanism 15 described later can be exemplified.

By adopting the rod-shaped contact portion 14a, the dead space formed by the conventional left and right arms 5 and 6 and the presser member 8 is eliminated in the vicinity of the work with which the contact portion 14a contacts, and the work of processing into the work. It is possible to improve the efficiency of the work process.

The contact portion 14a is a taper 14b that becomes thinner toward the tip. As the shape, a shape, thickness, and length more suitable for the object, such as a cylinder and a prism, may be selected. By using the taper 14b, it is possible to further reduce the dead space that hinders the arrival and movement of the processing equipment in the vicinity of the work in which the contact portion 14a comes into contact.

Further, the work positioning clamp 11 is provided with a push pressure adjusting mechanism 15 including a stopper 15b for fixing the position of the contact portion 14a in the toggle clamp 1. Here, the pressing force adjusting mechanism 15 includes a first nut 15a fixed to the bottom surfaces of the left and right arms 12 and 13, a stopper 15b which is a screw screwed to the first nut 15a, and a second nut screwed to the stopper 15b. It is composed of 15c, and the position of the stopper 15b is fixed by tightening the second nut 15c until it comes into contact with the first nut 15a.

When the stopper 15b is screwed into the first nut 15a, the end side of the contact portion 14a is pushed upward in FIG. 2 at the end of the stopper 15b (dashed line double arrow E) and comes into contact with the work of the contact portion 14a. It is possible to move the tip portion to be moved to the work side and increase the pressing force by the contact portion 14a to the work. On the contrary, if the screw of the stopper 15b is loosened, the tip of the contact portion 14a is separated from the work side in FIG. 2 (dashed-dotted double arrow D), and the pressing force by the contact portion 14a to the work can be reduced. ..

If the position of the abutting portion 14a can be fixed, it is not necessary to use the pressing pressure adjusting mechanism 15 and the stopper 15b. The pressing force of the contact portion 14a may be adjusted.

FIG. 3 shows a photograph of the work positioning clamp 11 when the lock is released. When the handle 4 is rotated in the direction of the alternate long and short dash arrow F, the left and right arms 12, 13 and the contact portion 14a rotate in the direction of the alternate long and short dash line G, the toggle mechanism is unlocked, and the contact portion 14a is released. It can be separated from the contact of the work.

FIG. 4 shows a schematic view when the work positioning clamp 11 (push pressure adjusting mechanism 15 not shown) of the present invention is used as a welding aid. At the same time, a part of the conventional toggle clamp 1 is also posted. The mounting destinations of the mounting surface 2a of the toggle clamp 1 and the work positioning clamp 11 are not shown. The mounting surface 2a is usually fixed to a table (not shown) standing up from a holding jig 9, a workbench, or the like with screws (not shown).

As shown in FIG. 4, for example, when welding a robot torch, the works 10 and 10a are fixed to the holding jig 9 so as to position the welded portion 10b. The pressing jig 9 is composed of a receiving jig 9a that is created and set according to the work 10 and 10a and receives the pressing, and a fastener 9b that is fastened by a kind of screwing of the pressing means. In order to improve the accuracy and fix the works 10 and 10a with good workability, positioning is performed using the conventional toggle clamp 1 and the work positioning clamp 11 of the present invention.

The work positioning clamp 11 of the present invention is used in a fine place and a narrow place in the vicinity of the welded portion 10b. As is clear from FIG. 4, when the work 10a in the vicinity of the welded portion 10b is pressed by the toggle clamp 1, the space occupancy around the welded portion 10b is higher than that of the work positioning clamp 11. As a result, there is a dead space that the torch (not shown) cannot reach, interferes with the flow line of the torch, and cannot be welded in one welding process.

On the other hand, with the work positioning clamp 11 of the present invention, a wider work space than the conventional toggle clamp 1 can be secured around the works 10 and 10a.

The work positioning clamp 21 of the present invention shown in FIG. 5 differs from the work positioning clamp 11 of the first embodiment in the following points.

First, a notch 22b is made in a part of the mounting surface 2a, and then the mounting member 22 is changed to the mounting surface 22a which is partially bent together with the hole 2b (the hole in the upper right of FIG. 5). Further, a protrusion 23 for locking the spring 24 is added to the right arm. If the spring can be locked instead of the protrusion 23, it may be perforated. Then, the spring 24 is passed to the hole 2b and the protrusion 23.

As a result, the contraction of the spring 24 can assist the release of the lock of the toggle mechanism, and the pressing member 14 can be prevented from returning to the vicinity of the locked state due to gravity or the reaction when the locked state is released. can. As a result, when the work is removed from the holding jig 9 after the welding is completed, the work can be smoothly removed without hitting the work positioning clamp 21, and the work efficiency and the work process time can be shortened.

1 Toggle clamp 2 Mounting member 2a Mounting surface 2b Hole 2c Vertical material 3 Left connecting material 3a First screw 3b Second screw 3c Right connecting material 4 Handle 4a Cover 5 Left arm 5a Third screw 5b Fourth screw 6 Right arm 7 Top Front-rear positioning 7a Lower front-rear positioning 8 Presser member 8a Shaft 8b Abutment part 8c Upper nut 8d Lower nut 9 Presser jig 9a Receiver 9b Fastener 10 Work 10a Work 10b Welded part 11 Work positioning clamp 12 Left arm 13 Right arm 14 Presser member 14a Contact part 14b Tapered 13c Upper screw 13d Upper nut 15 Pushing pressure adjustment mechanism 15a First nut 15b Stopper 15c Second nut 21 Work positioning clamp 22 Mounting member 22a Mounting surface 22b Notch 23 Protrusion 24 Spring

Claims (5)

In a toggle clamp provided with a handle rotatably provided on a vertical member erected on a mounting surface and an arm that rotates or linearly moves in the work direction with the rotation of the handle and is locked by a toggle mechanism.
A work positioning clamp comprising a contact portion that can rotate up and down and fix a position at the tip of the arm to contact and press the work. The arm is provided with a stopper that hinders the vertical rotation of the contact portion.
The rotation stop position of the contact portion can be adjusted by the position of the stopper.
The work positioning clamp according to claim 1, wherein the position of the contact portion is fixed and the pressing force of the contact portion on the work can be adjusted. The work positioning clamp according to claim 1 or 2, wherein the contact portion has a tapered shape. The handle assists the release of the lock of the toggle mechanism by the contraction of the spring.
The work positioning clamp according to any one of claims 1 to 3, wherein the spring is passed to the arm and the mounting surface. A work positioning clamp according to any one of claims 1 to 4, wherein the work positioning clamp is for holding a work during welding of a robot torch.

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