JPS6056837A - Operating method for jig clamping machine - Google Patents

Abstract

PURPOSE:To stabilize opening and closing of a clamping pawl by providing a fixed position limit switch on a clamping final end part and constructing the captioned jig clamping machine such that said machine always initiates its clamping operation from an off state of said switch, in said jig clamping device emplyoing an endless rotating machine. CONSTITUTION:Both clutches 6, 7 of a jig clamping machine 1 and a workpiece mounting jig 2 are engaged with each other and a hydraulic motor 3 is rotated forwardly. Hereby, an operating shaft 4 is forwardly rotated and a clamping pawl 8 of the jig 2 is alowed to force a workpiece 14 to move in a direction where it is clamped for initiating clamping. Simultaneously, a dog holder 10 also moves to the right, and a clamping dog 10B turns on a limit switch 12 for detecting the clamping end and further said clamping pawl continues it clamping operation until a limit switch 13 for a fixed position is turned on. Then, the hydraulic motor 3 is reversed in a loosening direction to return the switch 13 to its off position. Hereby, said jig clamping machine always initiates its operation from a switch 13-off state without requiring additional stroke redundancy, allowing opening and closing of the clamping pawl to be stabilized.

Description

[Detailed Description of the Invention] The present invention relates to a method of operating a jig tightening machine, and more specifically,
Jig tightening that uses an endless rotating machine as a drive source to prevent the accumulation of strokes that occur when a single jig tightening machine repeatedly tightens and loosens a workpiece mounting jig. It concerns how the machine operates.

When using an endless rotating machine such as a hydraulic motor as a drive source, positioning cannot be performed by the drive source itself, so using such a drive source, one jig tightening machine can Tightening and loosening of multiple workpiece mounting jigs (forward and reverse rotation)
In the case of a jig tightening machine that repeats this operation and detects the position of the tightened end and loosened end by its own movement, the tightening position stops at the clamp position (mechanical position) of the jig, so The stopping position varies depending on the engagement phase of the clutch and variations in the thickness of the workpiece tightened with the jig. As a result, the position of the loosened end of p1 is strictly regulated by a limit switch or the like, and since the operation start position is different, the loosening stroke in the next operation will be different each time. For this reason, it is recommended to repeat the
Due to the accumulation of variations in the tightening and stopping positions, the conventionally required stroke exceeds the margin stroke of the workpiece mounting jig, which may be more or less, and the jig becomes ineffective.

It is an object of the present invention to eliminate the drawbacks of the prior art described above, to eliminate the need for providing an extra margin in the clamp claw stroke of a workpiece mounting jig that is tightened and loosened by a jig tightener, and to provide stable An object of the present invention is to provide a method for operating a jig tightening machine that can open and close clamp claws.

The method of operating the jig tightening machine according to the present invention uses a rotary machine/dresser as a drive source, and repeatedly rotates the operating shaft in the forward and reverse directions to tighten and loosen the workpiece mounting jig. , in the operating method of a jig tightening machine that detects the position of the tightening end and loosened end by self-motion, the tightening stroke end point side is adjacent to the tightening end detection switch that is turned on and off by a dock engaged with the operating shaft. A fixed position limit switch that is turned on and off by the dock is provided, and the fixed position limit switch is turned off after the tightening operation of the workpiece mounting jig is completed and the engagement between the operating shaft and the jig is released. If it is on, turn the operating shaft in the loosening direction to turn off the fixed position limit switch, and then rotate the operating shaft in the tightening direction to set the limit switch. This method is characterized in that the operating shaft is stopped by an ON signal from a position limit switch, and then the next workpiece mounting jig is loosened.

In short, the operating method of the jig tightening machine according to the present invention is an operating method in which the loosening stroke of each time is kept constant by making the loosening starting point of the operating shaft constant. can reach the purpose of

Hereinafter, the method of the present invention will be explained based on drawings of embodiments. FIG. 1 is a block diagram of an embodiment of an apparatus for carrying out the method of the present invention. An operating shaft 4 is incorporated into the jig tightening machine main body l,
The operating shaft 4 is rotated forward and backward by a hydraulic motor 3, which is an endrene rotating device. A clutch 6 is attached to the side of the operating shaft 4 opposite to the side on which the hydraulic motor 3 is attached, and the clutch 6 is adapted to mesh with a clutch 7 of the workpiece mounting jig 2. Due to the rotation of the operating shaft 4, the clamp claw 8 of the workpiece attachment jig 2 moves and tightens the workpiece 14 to the workpiece attachment jig 2 (
(installation) and loosen (removal).

A dog holder 10 having a screw that engages with a screw 5 machined on the operating shaft 4 is engaged with the operating shaft 4 by threading the screws together, and the rotational movement of the operating shaft 4 is caused by the linear movement of the dog holder 10. It is designed so that it can be changed in motion (in the direction of the left and right arrows in Figure 1). A loosening dog IOA and a tightening dog IOB are fixed to the dog halter 10.

In order to tighten and loosen the workpiece mounting jig with this jig tightening machine, after engaging the clutch 6 of the jig tightening machine with the clutch 7 of the workpiece mounting jig, the hydraulic motor 3 is turned on. When rotated in the forward direction, the operating shaft 4 rotates in the forward direction, the clamp claws 8 of the jig 2 move in the direction of tightening the workpiece 14, and the dog holder 10
moves to the right. As the workpiece 14 is tightened to the jig 2, the tightening dog IOB turns on the tightening end detection limit switch 12. Since it is necessary to rotate the motor 3 until the engagement phase of the clutch and the variation in the thickness 15 of the workpiece are satisfied, the rotation is stopped by turning on the pressure switch 22 which operates with a constant tightening pressure. When loosening the jig 2, after engaging the clutches 6 and 7 in the same way, the motor 3 is rotated in the opposite direction, the drag holder 10 moves to the left, and the loosening dog IOA is activated by the limit switch for detecting the loosened end. When (Ls) 11 is turned on, the jig 2 loosens its grip on the workpiece 14 and the motor 3 stops rotating.

The above method is no different from the method of tightening and loosening a workpiece mounting jig using a conventional jig tightening machine.

In the jig tightening machine, there is a tightening dog IOB on the end point side of the tightening stroke adjacent to the tightening end detection Ls11.
Fixed position limit switch (Ls
) 13 is provided. As in the previous procedure, the loosening process ends when L811 turns on, so the second
As shown in the figure, the tightening stroke starts from the point where Ls 11 is turned off, and stroke 1 starts from the point where Ls 12 is turned on.
8, the dog IOB is not tightened sufficiently as in the previous procedure, so the rotation continues until the pressure switch 22 is activated (the dog 1013 moves further to the right), and then stops. The position is within the range 19 in FIG. This position corresponds to the range state of 20 in FIG.
The state is divided into a range of states, that is, a state in which Ls 13 is on. The relationship between the dog 10B and Ls 12.13 in each state is shown in FIGS. 3 and 4.

Here, when the clutches 6 and 7 are disengaged and the fixed position Ls 13 is on as shown in FIG. 4, the hydraulic motor 3 is operated and the operating shaft 4 is moved in the loosening direction. In the case of the state shown in FIG. 4, the state shown in FIG. 3 is changed from the state shown in FIG. The operating shaft 4 is stopped.

Therefore, by performing this operation every time after the tightening operation, the starting point for the next loosening operation of the workpiece mounting jig 2 becomes constant, so that the loosening stroke 17 becomes constant. Just to be sure, stroke 17 is dog holder 1.
With a stroke of 0, the corresponding loosening stroke of the jig 2 is a stroke of 16.

Since the method of operating the jig tightening machine of the present invention is configured as described above, the following effects can be achieved.

(1) There is no need to provide extra margin in the clamp claw stroke of the workpiece mounting jig. (2) The clamp claw can be opened and closed stably.

(3) The problems of conventional jig tightening machines that use rotating equipment such as hydraulic motors as a drive source are solved, so the structure is simpler than jig tightening machines that use conventional cylinder-type drive sources. This means that the jig tightening machine can operate smoothly.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of an embodiment of an apparatus for carrying out the method of the present invention, Fig. 2 is an explanatory diagram of the relationship between the position of the detection limit switch and the tightening and loosening strokes, and Figs. 3 and 4 are FIG. 6 is a layout diagram showing mutually different aspects of the relationship between the dog and the detection limit switch at the end of the tightening operation.

Claims (1)

[Claims] ・Using an endless rotating device as a drive source, the operating axis is rotated forward and backward to repeatedly tighten and loosen the workpiece mounting jig, and the tightened and loosened ends are automatically positioned. In the operating method of the jig tightening machine, a fixed position limit that is turned on and off by the dock is placed on the end point side of the tightening stroke adjacent to a tightening end detection switch that is turned on by the dock that is engaged with the operating shaft. Set up a switch,
After finishing the tightening operation of the workpiece mounting jig and releasing the engagement between the operating shaft and the jig, if the fixed position limit switch is turned off, it will be turned on according to that state. In this case, rotate the operating shaft in the loosening direction to turn off the limit switch for fixed position, then rotate the operating shaft in the tightening direction and stop the operating shaft with the on signal of the limit switch for fixed position, and then , a method of operating a jig tightening machine characterized by performing the following loosening operation of a workpiece mounting jig.