JPS596990Y2 - Both ends detection device of reciprocating mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a device for detecting both ends of a reciprocating mechanism, and more particularly to a device for detecting both ends of a reciprocating mechanism using a single switch to detect both ends of reciprocating motion.

Reciprocating mechanisms are used in a wide range of applications, including various machine tools and automatic parts assembly equipment, and are also used in the automobile field, such as automatic seat slide mechanisms and headrest pop-up mechanisms.

FIG. 1 is a schematic explanatory diagram of a conventional both-end detection device for a reciprocating mechanism, in which a worm 2 is fixed to the rotating shaft of a motor 1, and a worm gear 3a is formed with the worm 2 mounted on one end of a screw shaft 3. They are engaged.

This screw shaft 3 is rotatably supported via bearings 5 at both ends of the frame 4, and is engaged with a nut housing 6.

Furthermore, two switches 7a, 7b are attached to the frame 4 at intervals corresponding to the reciprocating width, and the switches 7a, 7b
A contact terminal 9 that can come into contact with a movable contact 8 is fixed to the nut housing 6.

Therefore, when the motor 1 rotates in one direction, the screw shaft 3 also rotates, and the nut housing 6 moves to the right (or left).
and the contact terminal 9 is connected to one switch 7a (or 7
Contact the movable contact 8 of b) to switch the switch 7a (or 7b).

Then, the motor 2 reverses, the screw shaft 3 also rotates in the opposite direction, and the nut housing 6 moves to the left (or right).
Move to.

At this time, the movable contact 8 of the switch 7a (or 7b) has returned to its original state.

However, in the conventional device described above, two switches 7
A and 7b are required, and at the same time, the movable contact 8 must have an automatic return function, which has the disadvantage of being expensive.

In addition, since the reciprocating width is directly affected by the mounting position of both switches 7a and 7b, when installing both switches 7a and 7b, the positions must be adjusted to obtain a predetermined reciprocating width. Both switches 7a, 7b
Since it is necessary to attach a lead wire 10 to each of the wires, the wiring distance is long and complicated, and at the same time,
When the contact terminal 9 is a rigid body, it has a disadvantage that the movable contact 8 is easily damaged.

The purpose of this invention is to eliminate the drawbacks of the prior art mentioned above,
It is possible to detect both ends of reciprocating motion by using only one switch, and the amount of bolts and washers used to install this switch is small, and the switch does not need to have an automatic return function. In addition to being low-cost, the switch is easy to install because the mounting position has no effect on the reciprocating width.In addition, wiring can be simplified, and at the same time It is an object of the present invention to provide a device for detecting both ends of a reciprocating mechanism that can eliminate the fear of overload.

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

2 to 4 show an embodiment of this invention, in which one switch 12 is fixed to a suitable position (slightly to the left in the illustrated example) on a switch support 11 with a screw 13, and the movable contact of the switch 12 is 12a protrudes from a long hole 11a formed in the switch support 11.

Further, a connecting rod 15 is attached to the switch support 11 via an elastic body, in this case a coil spring 14.

More specifically, each of the switch support 11 and the connecting rod 15 has elastic body fitting holes 16 and 17 having protrusions 16 a, 16 b and 17 a, 17 b at both ends, and these elastic body fitting holes Coil spring 1 inside 16, 17
Insert 4.

At this time, one of the protrusions 16a and 17a is fitted to one end side of the coil spring 14, and the other protrusion 16a is fitted to one end of the coil spring 14.
b, 17b are fitted to the other end side of the coil spring 14.

Therefore, in this state, the switch support 11 and the link 1
5 are coupled via the coil spring 14.

Further, when assembling these, the movable contact 12a of the switch 12 is engaged in the locking hole 15a formed in the connecting rod 15.

Further, end detection portions 18 a and 18 b are formed on the connecting rod 15 at intervals corresponding to a predetermined reciprocating width.

In addition, in the case of the illustrated example, both detection units 18 a and 18 b
Although each is shaped by cutting and raising, other methods may be used depending on the case.

A screw shaft 20 is rotatably disposed at both ends of the switch support 11 via bearings 19, and a worm 21 is engaged with a worm gear 20a formed on one side of the screw shaft 20. 21 is fixed to the rotating shaft of a motor 22.

Further, a nut housing 23 as a member capable of reciprocating relative to the connecting rod 15 is engaged with the screw shaft 20.

This nut housing 23 includes both the detection portions 18a,
18b is provided with a contact portion 24 that can be contacted.

Therefore, when the motor 22 is rotated in one direction, the screw shaft 20
rotates, and the nut housing 23 moves to the right in the drawing.

Note that if the motor 22 is rotated in the opposite direction, the nut housing 23 will move to the left.

Then, when the nut housing 23 continues to move rightward and its contact portion 24 contacts one of the detection portions 18b,
As the nut housing 23 moves to the right, the connecting rod 15 also moves to the right, the coil spring 14 is compressed according to the amount of movement of the connecting rod 15, and the movable contact 12a of the switch 12 also moves to the right.

By the way, when the contact part 24 of the nut housing 23 is not in contact with either of the detection parts 18a, 18b,
Each contact of switch 12 is in a neutral position as shown in FIG.

That is, in this neutral position, the movable contact 12a is in contact with the right end limit contact 25 as a right end detection contact, the left end limit contact 26 as a left end detection contact, and the ground side contact 27 as a common contact.

Therefore, when the movable contact 12a of the switch 12 moves by a predetermined amount to the right with the movement of the connecting rod 15, the movable contact 12a
2a and the right end limit contact 25 are separated as shown by the imaginary line in FIG. It becomes electrically conductive through the ground side contact 27, but as will be described later with reference to FIG. 10, unless the seat slide switch 40 is operated in the opposite direction, the remoter 22 will rotate in the opposite direction. never start.

Next, when the motor 22 is rotated in the opposite direction to move the nut housing 23 to the left in the figure, the abutment portion 24 is separated from the detection portion 18b.

At this time, the connecting rod 15 also moves to the left due to the recoil force of the coiled spring 14, which was in a compressed state, and returns to its original state.
At the same time, the movable contact 12a is inserted through the locking hole 15a of the connecting rod 15.
also moves to the left and returns to its original state.

Therefore, the switch 12 does not need to have an automatic return function as in the conventional case.

Then, as the nut housing 23 continues to move to the left in the figure, the contact portion 24 contacts the other detection portion 1 of the connecting rod 15.
8a and compresses the coil spring 14 while connecting the connecting rod 15.
And the movable contact 12 a also moves to the left, and the movable contact 1
2. The rotation of the motor 22 stops when the contact 2a leaves the left end limit contact 26.

Next, when the motor 22 is rotated in the opposite direction and the nut housing 23 is moved to the right in the drawing, the connecting rod 15 and the movable contact 12a are returned to their original positions due to the recoil force of the coil spring 14, which was in a compressed state. Return.

In this way, reciprocating motion can be detected by using only one switch 12, and the switch 12 does not need to have an automatic return function.

In the embodiment shown in FIGS. 2 to 4, the switch support 1
1 is in a fixed state and the nut housing 23 is moved; however, on the contrary, the nut housing 23 is in a fixed state and the switch support 11, switch 12, connecting rod 15, screw shaft 20, and motor 22 Even when the reciprocating motion is movable, it is possible to detect both ends of the reciprocating motion.

5 to 10 show an embodiment in which the nut housing 23 is in a fixed state, and shows a case where the nut housing 23 is applied to an auto seat slide mechanism for an automobile.

That is, FIG. 5 is a perspective view of the automobile seat, and FIG. 6 is a bottom view, in which the seat body 30 is electrically movable in the front and rear directions.

In addition, in Figures 5 to 9, Figures 2 to 4
Parts having the same functions as those in the figures are given the same reference numerals.

Therefore, the seat body 30 is provided with a moving rail 31 and is slidably disposed on a fixed rail 32 attached to the vehicle body side.

Then, the nut housing 23 is fixed to the fixed rail 32, and the bracket 33 is attached to the movable rail 31. 34
The switch support 11 is fixed with screws 35, bolts 37, etc., and the motor 22 is attached to the bracket 34 with bolts 3
It is fixed by 7 mag.

A worm 21 is attached to this motor 22, and a worm gear 38 has this worm 21 fixed to the end of the screw shaft 20.
It is slowing down accordingly.

Note that the screw 36 slides and guides the connecting rod 15.

Therefore, the seat slide switch 40 shown in FIG.
When the motor 22 is rotated in one direction by operating, for example, even if the left movable contact of the seat slide switch 40 in FIG. 10 is operated and brought into contact with the left upper fixed contact,
Since the right side movable contact remains as shown, the power supply passes through the left upper fixed contact of the seat slide switch 40, the left center contact, the motor 22, the right center contact of the switch 40, the right upper fixed contact, and the upper contact of the switch 12. The motor 22 rotates in one direction until the circuit is formed and the upper contact of the switch 12 is opened at a predetermined limit position, so that the screw shaft 2
0 rotates at a reduced rotation speed, and the nut housing 23
is fixed, the screw shaft 20 moves in one direction, for example, in the direction of arrow A in FIG. 7, and the seat body 30 also moves in the direction of arrow A.

As this movement continues, the detection part 18b of the connecting rod 15 comes into contact with the contact part 24 of the nut housing 23, and further moves slightly in the direction of arrow A, switching the contact point of the switch 12, causing the screw shaft 20 to rotate. The power supply circuit of the motor 22, which rotates the motor 22 to move in the direction of arrow A, is cut off.

In this way, when the screw shaft 20, the seat body 30, etc. move in the direction of the arrow A, the detection part 18b of the connecting rod 15 comes into contact with the contact part 24 of the nut housing 23, so that one end side is detected, and the one end side is detected in the direction of the arrow A. When moving in the opposite direction, the detection portion 18a of the connecting rod 15 comes into contact with the contact portion 24, thereby detecting the movement.

As is clear from the detailed description above, according to the device for detecting both ends of a reciprocating mechanism of this invention, it is possible to detect both ends of reciprocating motion by using only one switch. The amount of power cords, mounting brackets, bolts, nuts, washers, etc. that come with this device can be significantly reduced, and the switch does not need to have an automatic return function, resulting in a significant cost reduction. can.

In addition, since the mounting position of the switch does not affect the reciprocating width, the conventional problem of having to adjust the distance between two switches can be completely eliminated, and in addition, wiring can be simplified. At the same time as possible, the chance of wire breakage can be reduced accordingly, and since the abutting part of the member that can reciprocate relative to the connecting rod does not directly contact the movable contact of the switch, the switch is protected, and This has very excellent effects, such as the ability to form the abutment portion and the detection portion of the connecting rod from an inexpensive rigid material.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of a conventional both-end detection device of a reciprocating mechanism, and FIGS. 2 and 3 are a plan explanatory view and an exploded perspective view, respectively, of a both-end detection device of a reciprocating mechanism according to an embodiment of the present invention. Fig. 4 is an explanatory diagram showing the switch structure of Fig. 2, and Figs. 5 to 10 show examples of application of this invention.
5 and 6 are respectively a slope explanatory diagram and a bottom explanatory diagram of the slide seat, and FIGS. 7 to 10 are a schematic plan view and a schematic side view, respectively, of a both end detection device applied to the slide seat. FIG. 2 is a schematic front view and an electric circuit diagram. DESCRIPTION OF SYMBOLS 11... Switch support body, 12... Switch, 12 a... Movable contact, 14...
・・Elastic body (coil spring), 15 ・・・Connection rod, 1
5 a...Lock hole, 18a, 18b...
・Detection part, 24... Contact part, 25...
Contact for right edge detection, 26...Contact for left edge detection.

Claims (1)

[Scope of utility model registration request] A switch having a reciprocating end detection contact and a movable contact that can come into contact with and separate from the end detection contact is fixed to a switch support, and the switch is opposite to the switch support. A connecting rod arranged in parallel with each other and provided with end detection parts on both ends at intervals corresponding to a predetermined reciprocating width,
The movable contact is connected via an elastic body that has the function of returning the movable contact to a neutral position, and the movable contact side of the switch and the connecting rod are engaged so as to be movable together, and reciprocate relative to the connecting rod. The contact portion provided on the member and the end detection portion of the connecting rod are brought into contact with each other at one end side of the reciprocating movement, and the repulsion force of the elastic body is applied. The one end detection contact and the movable contact are brought into contact against each other, and at the other end of the reciprocating movement, the abutment part and the other end detection part come into contact with each other, thereby reducing the repulsive force of the elastic body. A device for detecting both ends of a reciprocating mechanism, characterized in that the other end detecting contact and the movable contact are disposed at a position where they are brought into contact with each other.