JP3688376B2 - Angle limit device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an angle limiter preparative equipment, in particular, it relates to a novel improvement for cam destroy the connecting pin of the rotary shaft when exceeding the limit range, to prevent the transmission of torque during the overtravel by idle gear .
[0002]
[Prior art]
Conventionally, in this kind of angle limiter bets equipment which has been used, when exceeding the limit range, the stopper consisting of a large, robust components provided, were forcibly stops the entire motion.
[0003]
[Problems to be solved by the invention]
Conventional angle limiter DOO equipment because it has been configured as described above, the following problems were present. In other words, since the stop state is forcibly maintained by a huge stopper, the motor as a drive source may be burned out, and the apparatus itself has to be enlarged.
[0004]
The present invention has been made to solve the above-described problems. Particularly, when the cam exceeds the limit range, the connecting pin of the rotating shaft is broken, and the gear is idled to transmit torque during overtravel. and to provide to the angular limiter preparative equipment to prevent.
[0005]
[Means for Solving the Problems]
An angle limit device according to the present invention is configured to reduce the rotation of a drive source via a gear, drive a load, and detect rotation of a cam by a limit switch. A worm gear and n gears connected to a drive source, a rotating shaft provided on the worm gear, a connecting pin for connecting the worm gear and the rotating shaft provided on the rotating shaft, and provided on the rotating shaft A stopper-equipped gear having a stopper, a control cam provided on a shaft of any one of the n gears, and a stopper shaft that can be moved in and out by engagement with the control cam. When the limit range of the limit switch is exceeded, the stopper shaft interferes with the stopper, the gear with the stopper stops, the connecting pin is destroyed, Omugiya is a configuration that has to be idle.
[0006]
More specifically, the stopper shaft is always biased to one side by a spring.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of the angle limiters preparative equipment according to the present invention will be described in detail with reference to the accompanying drawings.
In FIG. 1, a reference numeral 1 denotes a drive source composed of, for example, a motor, and a worm (pinion) 2 connected to the drive source 1 is a gear provided rotatably on a support portion 3 via a bearing 4. in conjunction with meshes with the worm gear 5 Ru Oh, worm gear 5 is integrally joined with each other by connecting pins 7 provided on the rotary shaft 6. The connecting pin 7 is made of a material and a shape that can be broken when a torque exceeding a predetermined level is applied.
[0008]
A stopper-equipped gear 9 having a stopper 8 protruding is provided at an end of the rotating shaft 6, and a transmission gear 10 provided on the rotating shaft 6 is a train wheel provided on the support portion 3. The first gear 11a is connected to and engaged with the first shaft 11aA, the second gear 11b is connected to the second shaft 11bA, and the third gear 11c is connected to the third shaft. In 11cA, the nth gear 11n is provided on the nth shaft 11nA. The worm gear 5 and the first to nth gears 11a to 11n constitute a gear. Further, a load such as a table (not shown) is connected to the n-th shaft 11nA, and FIG. 1 is shown as an exploded view, so that actually the gears 5, 11a to 11n are shown in FIG. It is composed by polymerizing each other.
[0009]
As shown in FIG. 3 , the cam 20 provided at the end of the second shaft 11bA contacts the detection rollers 21a and 22a of the pair of limit switches 21 and 22, and the protrusion 20a of the cam 20 An angle range that does not pass over the detection rollers 21a and 22a is detected as a limit range.
[0010]
A stopper shaft 25 that is always urged in one direction by a spring 23 is provided on the end portion side of the support portion 3 so as to be able to protrude and retract. The stopper shaft 25 supports the support portion 3 located below. It penetrates the hole 3b of the plate 3a and is provided so as to protrude downward. The gear 9 with stopper actually overlaps with the stopper shaft 25 as shown in FIG. 2, and the stopper shaft 25 interferes with and comes into contact with the stopper 8 to stop the rotation of the gear 9 with stopper. It is configured as follows.
Incidentally, when indicated by E each axis 6,11aA~11nA described above from A, is constituted by approaching each axis to each other as shown in FIG. 3, first, second detection provided at the upper end of the n-axis 11nA The cams 50 and 51 are provided with a pair of detection bodies 52 and 53 provided on the support portion 3. The control cam 60 at the lower end of the shaft 11nA is in contact with the flange 25a of the stopper shaft 25, and the notch 60a (same as in FIG. 4) is configured to allow the flange 25a to pass therethrough.
[0011]
Next, the operation will be described. First, when the drive source 1 is driven, the worm gear 5 is rotated through the worm (pinion) 2 and the gears 11, 11a, 11c, 11n are rotated through the shaft 6 to be decelerated. A load such as (not shown) can be driven.
In the above drive, as shown in FIG. 3, when the protrusion 20a of the cam 20 gets over the detection rollers 21a and 22a of the limit switches 21 and 22 due to some overtravel, the control cam 60 is synchronized with this operation. 1 and the flange 25a of the stopper shaft 25 disappears, and the flange 25a passes through the notch 60a, so that the stopper shaft 25 protrudes downward from the state of FIG. 7 is destroyed. Therefore, the coupling between the worm gear 5 and the shaft 6 is released, the worm gear 5 is idled, and burning of the drive source 1 is prevented. The connecting pin 7 and the control cam 60 described above are not limited to the above-described embodiments, but can be provided on other shafts.
[0012]
【The invention's effect】
Angle limiter preparative equipment according to the present invention, since it is constructed as described above, it is possible to obtain the following effects.
In other words, when the rotation of the load overtravels beyond the limit angle, the connecting pin provided on the shaft is broken and the drive side is idled. Since no stopper is required, the entire apparatus can be miniaturized.
[Brief description of the drawings]
FIG. 1 is a developed sectional view showing an angle limiter according to the present invention.
FIG. 2 is a configuration diagram illustrating a main part of FIG. 1;
FIG. 3 is a plan view showing FIG. 1;
4 is a configuration diagram showing a main part of FIG. 1. FIG.
FIG. 5 is a configuration diagram showing a main part of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Drive source 5 Worm gear 6 Rotating shaft 7 Connecting pin 8 Stopper 9 Gear with stopper 11a-11n Gear (gear)
20 Cam 21, 22 Limit switch 25 Stopper shaft 60 Control cam

Claims (2)

  Angular limit that decelerates the rotation of the drive source (1) via the gears (5, 11a to 11n), drives the load, and detects the rotation of the cam (20) by the limit switch (21, 22) In the apparatus, the worm gear (5) and n gears (11a to 11n) constituting the gear and connected to the drive source (1), and a rotating shaft (6) provided in the worm gear (5), A connecting pin (7) for connecting the worm gear (5) and the rotating shaft (6) provided on the rotating shaft (6), and a stopper (8) provided on the rotating shaft (6). The control cam (60) provided on the shaft of the gear (9) with stopper and any one of the n gears (11a to 11n) and the control cam (60) can be freely moved in and out. A stopper shaft (25), and when the cam (20) exceeds the limit range of the limit switch (21, 22), the stopper shaft (25) interferes with the stopper (8) and the stopper shaft (25) is attached. An angle limit device characterized in that the gear (9) is stopped, the connecting pin (7) is broken, and the worm gear (5) is idled. The stopper shaft (25) is an angle limit device according to claim 1, characterized in that it is normally urged one side by a spring (23).

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