JPH0572348U - Limit switch pressing tool - Google Patents

Abstract

(57) [Abstract] [Purpose] When adjusting or inspecting a machine, the limit switch can be pressed without the help of others to temporarily activate the limit switch You get the ingredients. [Structure] Plunger type limit switch 13 as a safety device attached to the shielding door 10 of machine tools etc.
A cylindrical portion 20 with a screw for mounting the panel to a panel, a lower end opening is provided with an internal thread portion 22 that is screwed to fit the plunger 18 of the limit switch 13, and the plunger of the limit switch 13 is provided at the top. A limit switch pressing tool (25) composed of a tubular member (24) screwed with an adjusting screw (23) for pressing 18.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is necessary for temporarily operating the machine when adjusting, inspecting, or repairing the plunger type limit switch, which is installed in various places as an operation confirmation device or a safety device in a machine tool. This is related to the limit switch pressing tool.

[0002]

[Prior Art]

 For example, in a machine tool, an interlocking limit switch is installed to prevent the machine from operating unless the splash guard door is closed, but open the door to open the machine. When adjusting or repairing, the limit switch must be artificially turned on or off to temporarily disable the interlock function.

For this reason, when inspecting or repairing the machine, it is necessary to have another person temporarily push the limit switch, or to wind the tape and forcibly stop the plunger of the limit switch at the position where it was pushed. It was

[0004]

[Problems to be solved by the device]

 By the way, in order to keep the limit switch pressed while checking or repairing the machine, it must be done manually or by taping. The pressing amount of the limit switch is 1.0 to 1 after the switch is turned on. The ideal size is 0.5 mm, and if you push it too deeply, it may cause damage, or conversely you may not be able to release the interlock due to insufficient push. Furthermore, if it is done manually, it requires extra personnel, and if it is done by taping, it not only takes time to attach and detach the taping, but it also causes damage.

[0005]

[Means for Solving the Problems] According to the present invention, even if the plunger of the plunger type limit switch is pushed in, the limit switch can be easily turned on or off by one person without the help of others. The present invention intends to provide a limit switch pressing tool that can adjust the pressing margin of the switch easily, and its structure is as follows.

[0006] An adjusting screw for pressing the plunger of the limit switch is screwed on the top of a cylindrical member having a female threaded portion that is screwed into the panel mounting threaded portion of the plunger type limit switch at the lower end opening side. Limit switch pressing tool configured by.

[0007]

[Action]

 The internal threaded portion provided on the lower end opening side of the tubular member of the limit switch pressing device according to the present invention is screwed and locked so as to be fitted into the panel mounting screwed tubular portion of the plunger type limit switch, and then the tubular member top portion. The limit switch can be artificially and temporarily activated by slowly turning the adjusting screw provided on the and pushing down the plunger gradually with its tip.

[0008] Furthermore, the tip of the screw can be moved up and down by screwing the adjusting screw provided on the top of the tubular member up and down to adjust the plunger pressing amount of the switch.

[0009]

【Example】

 FIG. 1 shows a state in which the limit switch pressing tool according to the present invention is screwed into a panel-attached threaded tube portion of a plunger-type limit switch attached to a mechanical device as a safety device, and the switch plunger is pushed down. FIG. 2 is a partial cross-sectional front view, and FIG. 2 is a top view showing an example of places where limit switches are installed to form a safety device in a horizontal machining center.

In FIG. 2, reference numeral 1 is a horizontal machining center, which is composed of a column 3 equipped with a main shaft 2, an NC device 4, an ATC magazine 5, and a table 6, around which people are kept for the prevention of chip scattering and for safety. A splash guard 7, a magazine cover 8 and a rear protective fence 9 are provided to prevent access, and a door 10 is provided for each worker to enter and exit for centering the work and tools, and an entrance / exit for tool change. There is provided a door 11 for operating the door, and a door 12 for an operator to perform maintenance work on the rear surface of the column.

Plunger type limit switches 13, 14 and 15 are provided on the respective door portions so as to prevent the mechanical device from operating when the respective doors 10, 11 and 12 are open. , The wiring is set so that the mechanical device can be operated when the switch plunger is pushed in by the door.

As shown in FIG. 1, each of the plunger type limit switches 13, 14 and 15 includes a mounting bolt 17, 17 on the limit switch body 16 or a tubular portion 20 with a panel mounting screw, and a nut 21 to attach each splash guard 7, Mount the magazine cover 8 and the rear protective fence 9 at appropriate places so that when the door is closed, the plunger 18 protruding from the limit switch body 16 is engaged with the door and pressed to open and close the switch. It is being done. A roller 19 is provided at the tip of the plunger so that the plunger 18 can be pressed smoothly by contact with the door.

In the present embodiment, the plunger type limit switch body 16 includes a tube with a panel mounting screw for mounting the switch body 16 on each panel of the splash guard 7, magazine cover 8 and rear protective fence 9 at appropriate places. The end portion of the portion 20 is formed so as to project, and the plunger 18 is configured to slide inside the end portion. The panel is mounted by using two panel mounting nuts 21 and 21 screwed into the tubular portion 20 with the panel mounting screw. It is inserted and fixed. Alternatively, the limit switch body 16 may be directly attached and fixed to the mating member of the doors 10, 11 and 12 by the bolts 17 and 17.

According to the present invention, the interlock limit switch provided for the safety of the operator is manually turned on or off when the door is opened to adjust or repair the machine. In order to temporarily disable the lock function, as shown in FIG. 1, the plunger type limit switch body 16 is fixed to the tubular portion 20 with a screw and the plunger 18 of the limit switch is provided at the lower end opening. A limit consisting of a tubular member 24 having a female threaded portion 22 that is screwed into the threaded tubular portion 20 so that it can be fitted, and an adjusting screw 23 for pressing the plunger 18 of the limit switch screwed on the top portion. By using the switch pressing tool 25 and screwing the female thread portion 22 of the limit switch pressing tool 25 into the tubular portion 20 with panel mounting screw of the switch body 16, the adjustment screw 23 can be planed by the tip. Thereby push the turbocharger 18, and an inoperative state interlock function of the limit switch.

At this time, the adjusting screw 23 is at a slightly retracted position, and if the pressing member 25 is screwed into the threaded tubular portion 20 and then the plunger 18 is pushed to the proper position by the adjusting screw 23, the limit is set. There is no danger of excessive pressure being applied to the switch. Naturally, the pitch of the screw is a known amount (for example, the pitch is 1 mm for the M6 screw), so it is easy to see how many rotations it takes to push the plunger to the proper position. Reference numeral 26 is a lock nut for the adjusting screw 23 so that the adjusting screw 23 is not displaced.

Therefore, when adjusting or repairing the machine while the door remains open, it is necessary to temporarily disable the interlock function, but in this case, simply press the limit switch. It suffices to screw the tool 25 into the tubular portion 20 with screws for fixing the limit switch body 16 and fix it.

It should be noted that the tubular member 24 is preferably painted in a prominent color such as red or yellow so that it will not be forgotten to remove it after the work.

[0018]

[Effect of the device]

 According to the present invention, when the plunger type limit switch used in a machine tool or the like is temporarily operated during adjustment, inspection, or repair of the machine, the limit switch body 16 and the tubular portion with a screw for fixing 20 In addition, since it can be performed by simply screwing in and fixing the limit switch pressing device 25, it can be performed accurately without the need for another person and without damaging the limit switch, as was conventionally done. it can. Also, since the pitch of the adjusting screw is known, it is easy to find out how many turns the proper pushing allowance is, and this also has the effect of not damaging the limit switch.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view showing a state where a limit switch pressing tool according to the present invention is screwed into a screw part for fixing a plunger type limit switch body.

FIG. 2 is a top view illustrating a limit switch installation location in a horizontal machining center.

[Explanation of symbols]

 1 Machining center 2 Spindle 3 Column 4 NC device 5 ATC magazine 6 Table 7 Splash guard 8 Magazine cover 9 Rear guard fence 10, 11, 12 Door 13, 14, 15 Limit switch 16 Limit switch body 18 Plunger 20 Panel mounting screw cylinder 22 Female thread 23 Adjusting screw 24 Cylindrical member 25 Limit switch pressing tool

Claims (1)

[Scope of utility model registration request] 1. An adjusting screw for pressing a plunger of the limit switch is screwed onto a top of a tubular member having a female threaded portion on a lower end opening side to be screwed into a panel mounting screwed tubular portion of a plunger type limit switch. A limit switch pressing tool that is configured by being installed together.