KR20010032516A - Toggle-style overload protection device - Google Patents

Abstract

An overload protection device using a linear guide for reciprocating an actuating member connected to each other and a restraining cam for reciprocating the actuating member has a toggle assembly fixed to the actuating member. The toggle assembly includes a U-shaped body, two support links rotatably connected to a free end of the toggle assembly body portion opposite free ends that engage the end of the link, and a cam follower rotatably supported by a pin. (cam follower). The cam follower is engaged with the limiting cam to position the limiting cam in a controlled limiting position between the cam follower and a corresponding cam follower roll fixed to the actuating member. The toggle assembly allows to reduce the size of the overload protection device and also allows for setting of increased allowable load.

Description

TOGGLE-STYLE OVERLOAD PROTECTION DEVICE}

The overload protection device is used as a cam motion limiting device for translating the operating members so that a device such as a terminal insertion device does not apply too much pressure or insertion force on the terminal.

In a terminal insertion device in which a conductive terminal is inserted or stitched into a corresponding opening arranged in an insulated connector housing, the stitching head is typically operated to reciprocate in two different directions by a cam movement assembly. Sometimes the openings in the conductor housing are improperly aligned and, when stitched, they hit the connector housing rather than enter the terminal opening.

When this happens, it is desirable to have some control and prevention functions to prevent the stitching head from continuing the insertion movement when it encounters a strong resistance exceeding a certain value. This prevention function adequately prevents the stretching head from continuing the insertion motion when hit by a force above the set insertion force. If the stretching head continues the insertion movement with respect to the set resistance force, the stretching head may rupture. So there is a need for this kind of protection.

8 of the application shows a known overload protection assembly for use with a cam motion limiting device. It can be seen that a conventional device comprises a first actuating member 53 guided by a first linear guide 52 to reciprocate in two opposite directions. The second linear guide 51 is positioned between the first operating member 53 and the second operating member 54 such that the second operating member 54 is guided by the second linear guide 51. The restricting cam 55 of the device for driving the first actuating member 53 to reciprocate is defined by a cam follower 56 rotatably mounted to the first actuating member 53. The second actuating member 54 may resist a certain load applied to the second actuating member 54 in the direction of the arrow of FIG. 8 by a compression spring 57 connected with the second actuating member. Rotation of the limiting cam 55 about the axis 58 of the device causes the first actuating member 53 to reciprocate before and after along the first linear guide 52 and the second actuating member 54. Move it.

Another known overload protection device is shown in FIG. 9, wherein the first actuating member 63 is guided by a first linear guide 62 connected with the first actuating member 63. The second linear guide 61 is arranged between the first operating member 63 and the second operating member 64 so that the second operating member 64 can be guided by the first linear guide 61. The limiting cam 65 is defined by two cam followers 66 rotatably mounted to the first and second actuating members 63, 64. The second actuating member 64 is connected to the first actuating member 64 by a compression spring 67 which exerts a force on the second actuating member 64 and two blocks 68 connected to the second actuating member 64. Pressed against. The rotation of the limiting cam 65 about the axis 69 of the device causes the first actuating member 63 to move back and forth along the first linear guide. The use of any of the second linear guides 51, 61 for applying a force to each first actuating member 53, 63 increases the size and weight of the overload protection device, and consequently the overload protection device increases. Reduces the speed at which you can respond to a given action at a given rate. The known overload protection device of FIG. 8 is configured to receive the load directly and prevents the device from overloading. Thus increasing the strength of the opposing compression spring 57 will cause an adverse effect on the protection provided by the device.

As in the apparatus shown in FIG. 9, the reverse moment shown by arrow 70 causes the first or second cam follower 66 to unstablely contact the cam 65, resulting in the above Break the equilibrium of the device. Shear pins may be used instead to allow the device to withstand increased loads, but the use of such shear pins does not provide the ability to restore the device and has poor regeneration. Therefore, it does not have good reliability in setting the required allowable load.

FIELD OF THE INVENTION The present invention relates to overload protection devices and assemblies used as a restraint-camming device to drive connected actuating members in reciprocating motion, in particular terminal stitching which is commonly used to insert conductive terminals in electrical connector housings. An overload protection device of a cam motion limiting device for operating an actuating member such as a terminal stitching head.

1 is a plan view showing an overload protection device constructed in accordance with the principles of the invention;

2 is a perspective view of a toggle assembly used in an overload protection device.

3 is a front view of the toggle assembly of FIG. 2.

4 is a plan view of the FIG. 3 toggle assembly taken along line 4-4 of FIG.

5 is a side view of the FIG. 3 toggle assembly taken along line 5-5 of FIG.

6 is a plan view of a second embodiment of an overload protection device constructed in accordance with the principles of the invention;

FIG. 7 is a force-displacement graph illustrating how the displacement of a toggle assembly cam follower varies with the force exerted on the toggle assembly cam follower by the limiting cam.

8 is a plan view of a known overload protection device.

9 is a plan view of another conventional overload protection device.

It is therefore an object of the present invention to provide an improved overload protection device for use in a cam motion limiting device for translating an actuating member connected to the device, wherein the overload protection device is set by the device for an increase in allowable load. It is small enough in size to be able to.

It is another object of the present invention to provide an overload protection device for use in a cam motion limiting device for driving an actuating member, such as a conducting terminal insertion head, in two opposite directions, the overload preventing device being provided between the limiting cam and the actuating member connected thereto. A collapsible toggle assembly in the form of a cam follower inserted into the cam follower, wherein the cam follower is movable in the first and second operating positions, where the cam follower contacts the limiting cam. Pressurized to transmit the driving force to the actuating member, in the second actuating position the cam follower itself collapses, separates from contact with the limiting cam, and finishes transmitting the actuation force to the actuating member.

In order to achieve the above and other objects, the overload protection device according to the present invention has a cam follower rotatably mounted to engage the limiting cam, and means for selectively transmitting a driving force from the limiting cam to the actuating member connected thereto. A folding toggle assembly is used.

Specifically, an overload protection device constructed in accordance with the principles of the present invention suitable for use in a cam motion limiting device having a guide for reciprocating an actuating member connected to the guide and a limiting cam for reciprocating the actuating member comprises: And a toggle-like assembly that is folded so that it can be mounted to the operating member, the toggle-like assembly having an elongated body of type “U” with two free arms, at the free end of the opposing arm on the opposite side. And two pins rotatably connected to each other and one pin for rotatably supporting the cam follower engaged with the two interlocks and engaged with the restriction cam, so that the cam follower and the It is improved by placing the limiting cam in a controlled limiting position between the two guide cam followers.

The overload protection device according to the invention does not use a second linear guide, and therefore the size or weight of the device can be advantageously reduced. The toggle used in the overload protection device allows the connected parts of the device to travel relatively short distances for increased load.

Other objects and advantages of the present invention will be understood from the following description of the overload protection device according to the preferred embodiment of the present invention shown in the accompanying drawings.

Reference will be made to the accompanying drawings, wherein like numerals refer to like parts in the course of the following detailed description.

Referring to FIG. 1, an overload protection device used in a cam motion limiting device is shown generally at 100. The overload protection device 100 is a linear guide (2) for reciprocating the operating member (1) connected to the linear guide (2), and when the limiting cam (2) rotates about the shaft (4), A limiting cam 3 which reciprocates the actuating member 1 in two opposite directions.

As can be seen in FIGS. 1 and 2, the folding toggle assembly 5 comprises a cam follower 6, which toggle assembly 5 is mounted on the first end of the actuating member 1, preferably. Preferably, it is mounted on a surface opposite to the working surface 102 of the limiting cam 3. The limiting cam 3 and the actuating member 1 are arranged in the cam follower 6 and the guide cam follower 7 rotatably mounted on the other side of the actuating member 1, as shown in FIG. 1. In the restricted position. In this position the cam follower 6 of the toggle assembly 5 maintains contact with the cam 3.

Referring now to FIGS. 2 to 5, a folding toggle assembly 5 constructed in accordance with the principles of the present invention comprises a base portion having a “U” shaped body or two free arms 8a, 8b and first and second ones. Two linkages 10 having links 10a, 10b, rotatably connected to the free ends of the opposing arms 8a, 8b by pins 9, as shown in " R " It can be seen that it includes a pin 11 engaged with both ends of the opposing arms 8a, 8b and a cam follower 6 rotatably supported by the pin 11.

As shown in FIG. 7, two interlocks 10 occur between the free arms 8a and 8b of the toggle assembly body portion 8 and the interspace separating the two free arms 8a and 8b. The cam follower 6 is supported in an intervening space 25. As in FIG. 4, the interlock device 10 of the toggle assembly 5 extends to the opposite side of the space 25, and serves to support the cam follower 6 therein. Two links 10a, 10b of the linkage 10 are pinned to free arms 8a, 8b at opposite ends of the linkage. The dotted line drawn through the center of the two pins 9 is defined by the line “L”, which defines the inlet of the interspace 25 and is useful for understanding the operation of the toggle assembly 5. The cam follower 6 will take one of two working positions on either side of this line L.

3 shows a first operating position of the two operating positions of the toggle assembly 5, wherein the interlock device 10 has a follower 6 with the limiting cam 3, as shown in FIG. 1 or 6. The cam follower 6 is held above or outside the inlet line "L" to maintain contact with 14). When the resistive force becomes greater than the set value by the actuating member 1 and the cam 3 continues to rotate while continuously applying a force to the actuating member 1, the cam follower 6 is folded by this excessive force. The interlock device 10 will move inward of the entry line L to take the position shown by the dashed line in FIG. 3. Here, the cam follower 6 is located inside or below the entry line.

Referring now to FIG. 6, a second embodiment of an overload protection device according to the present invention is generally referred to at 115 in FIG. 6. The device 115 reciprocates the actuating member 12 when the linear guide 13 and the limiting cam 14 rotate about the axis 15 to guide the actuated actuating member 12 to reciprocate. And a limiting cam 14 for. As in the case of the first embodiment, the folding toggle assembly 5 is provided with a cam follower 6 and fixed to the first end of the actuating member 12. Thus, the cam 14 and the actuating member 12 are in a restricted position by a fixed guide cam follower 16 rotatably fixed to the cam follower 6 and the second end of the actuating member 12. Is placed.

During operation, when an apparatus such as a connector terminal stitching head driven by the operating member contacts an object such as a connector housing, the operating member 3 or 14 is loaded as indicated by the arrow 17. 3 or 14 is driven to reciprocate by rotation of the limiting cams 3 and 14. The resistive load or the resistive force due to the terminal insertion is transmitted to the limiting cams 3, 14 via the cam follower 6 of the toggle assembly 5. Thus, the “V” shaped ridge formed by the two links 10a, 10b of the toggle assembly interlock device 10 is folded from the position in FIG. 3, whereby the toggle assembly 5 The cam follower 6 is displaced to the inside of the body portion 8 or to the "Y" position shown by the dashed line in FIG. 3.

7 shows how the displacement of the cam follower 6 of the toggle assembly 5 changes with increasing load. The displacement range "A" is the cam follower to reduce some gaps that may occur between the cam follower 6 and the outer cam surface 36 of the limiting cams 3 and 14 at the beginning of the operating member motion cycle. This represents a relatively large displacement range in which the displacement is occurring. The irregular displacement of the cam follower 6 with respect to the change in load can be reduced to a minimum by first applying a force to the toggle assembly that is of a magnitude large enough to cause a displacement exceeding the displacement range "A" and This allows for a quick transition to the displacement range "B". Thus, the change in displacement of the cam follower 6 due to the change in load can be minimized, whereby the limiting cam 3 or 14 is always kept in the limiting position, and as a result the actuating member 1 or 12 Is maintained at that position.

As can be seen from the displacement range "B", a relatively large allowable load range can be maintained. When a load large enough to move the cam follower 6 to the displacement range "C" is applied to the toggle assembly 5, the cam follower is displaced by an increased distance and the cam follower is provided to provide protection against overload. The cam 3 or 14 is released at the above-mentioned restriction position which kept contact with the (and consequently the operating member). After removing the cause of the overload, the overload protection device, with the aid of a suitable tool, moves the cam follower 6 on the outside of the inlet line "L" to the body part 8, i.e. By moving back to one operating position, the original restriction position can be restored.

As can be seen by the dotted line in FIG. 7, the length and width of the first and second links 10a, 10b of the interlock device 10, and the length and width of each of the two arms 8a, 8b of the toggle 5, respectively. The load-displacement relationship is varied so as to increase the load range in the permissible load range, i.e., the displacement range "B" where the displacement is preferably maintained between the limiting cams 3, 14 and the cam follower 6 Is determined. Thus, the allowable load is appropriately set for the purpose in which the cam motion limiting device is used, and the use of the folding toggle assembly 5 enables the setting of a relatively large allowable load.

As can be understood from the foregoing, the overload protection device according to the present invention does not require a second linear guide, thereby making it possible to reduce the size and weight of the entire structure accordingly, and to reduce the manufacturing cost. Advantageously, the overload protection device can operate quickly at the moment when the operating member is overloaded. A relatively large allowable load can also be set by the toggle assembly 5 used in the overload protection device, and the allowable load range can also be set simply by appropriately determining the arms 8a and 8b and the links 10a and 10b according to the purpose. Can be.

The toggle structure has opposing links 10a, 10b symmetrically fixed to the "U" shaped body 8, so that no moment occurs when the load is applied and the roll follower (6) prevents an unbalanced load.

While the preferred embodiments of the invention have been shown and described, it will be apparent to those skilled in the art that many changes and modifications can be made without departing from the spirit of the invention and the scope of the invention is defined by the appended claims.

Claims (16)

An overload protection device used in a mutually coupled cam movement device for driving an actuating member to reciprocate in two opposite directions, wherein the cam movement device comprises a linear guide assembly and a cam for guiding the actuating member connected to the linear guide to reciprocate. Further comprising a rotatable cam for driving said actuating member to make said reciprocating motion during rotation, said cam movement device being located on said actuating member to provide contact between said cam and said actuating member, In the overload protection device further comprises a cam follower rotatably mounted, A collapsible toggle assembly for supporting the cam follower in a connected state between the cam and the actuating member during operation of the cam motion limiting device, the preset value being set while the actuating member moves in the one direction. A cam including the toggle assembly that is folded such that the contact is released between the cam and the cam follower to stop movement in one of the two directions by the actuating member when it is subjected to excess resistance force Overload protection device used in exercise equipment. The base portion of claim 1, wherein the folding toggle assembly has two free ends extending therefrom to the cam, the two free ends being separated by an intervening space; A two linkages rotatably connected to a free end of the toggle assembly, disposed on both sides of the base portion, and spanning an interspace of the base portion, The linkage device rotatably supports a cam follower between two linkages, the cam follower can move between a first and second operating position, and the cam follower in the first operating position While the actuating member is in reciprocating motion, when the actuating member comes into contact with the cam and encounters a resistance force exceeding a set value in the actuating member moving in the one direction, the linkage interlocks between the base portion and the above. An overload protection device for use in a cam movement device that folds into space and thus separates the cam follower from contact with the cam. 3. The linkage device of claim 2, wherein each of the linkage devices has two opposing ends and a center point, wherein the opposite end of the linkage device is rotatably mounted to a free end of the base portion of the toggle assembly, and the cam follower is connected to the base. An overload protection device for use in a cam motion device, rotatably supported between the two linkages by pins extending laterally through the interspace of the portion, the pins being aligned with the center point of the linkage. 4. The cam follower of claim 3, wherein in the first operating position, the cam follower is located on one side of the imaginary line drawn across the inlet of the space between the base portions, the one side being outside of the space between the base portions. And the cam follower in the second operating position is used for a cam motion located inside the imaginary line. 3. The linkage device of claim 2, wherein each of the interlocks includes first and second links, each of the first and second links having a first end rotatably connected to the base portion free end, And a second end each having a second end overlapping each other at a position intermediate the first end of the link and an intermediate end of the base portion free end. 6. The overload protection device of claim 5, further comprising a pin rotatably supporting the cam follower and extending between the second ends of the first and second links. 6. The cam follower of claim 5, wherein the cam follower is mounted to a pin, each of the first link second ends comprising a hole for receiving the cam follower pin, each of the second link second ends being the cam bell. An overload protection device used in a cam movement device that includes a slot for receiving a copper pin. The overload protection device of claim 1, wherein the toggle assembly base portion is mounted to a surface of the actuating member opposite the contact surface of the cam. 2. The method of claim 1, further comprising a second cam for moving the operating member in a second of the two directions, and a second cam follower spaced apart from the cam follower by a predetermined distance, wherein the second cam follower comprises: An overload protection device used for a cam movement device mounted on the operating member to contact a contact surface of a second cam. 6. The overload protection device of claim 5, wherein the first and second links are used in a cam motion device having the same length. An improved overload protection device for use in a restraint-camming device, wherein the linear guide guides the actuating member associated with the linear guide to reciprocate in first and second different opposing directions, and the limiting cam operates An improved overload protection device used in the cam motion limiting device which drives the member to reciprocate, wherein the limiting cam drives the actuating member in at least one of the two directions. A folding toggle assembly positioned between the restricting cam and the actuating member, the toggle assembly comprising a body portion connected to the actuating member, the toggle assembly extending from the toggle assembly and separated by an intervening space Two arms, a cam follower rotatably supported on the pin, and two pairs of first and second support links, each of the first and second support links having two opposing ends; First ends of the first and second support links are rotatably connected to the toggle assembly partial free arms, and second ends of the first and second support links are aligned with each other and engage the cam follower pins; And thus supporting the cam follower between the body portion free ends, until the force preset by the limiting cam is applied to the cam follower. The first and second support links support the cam follower in contact with the limiting cover in the first operating position such that the support link rotates inwardly of the body portion free end of the toggle assembly, and the cam species An improved overload protection device for use with a cam motion limiting device including said toggle assembly for moving said cam follower into said interspace such that a winter releases contact with said limiting cam. 12. The improved overload protection device of claim 11 wherein the second end of the second support link is used in a cam motion limiting device positioned above the second end of the first support link. 12. The apparatus of claim 11, wherein the second end of the first support link comprises holes formed in the link to rotatably receive an opposite end of the cam follower pin, wherein the first end of the second support link is A slot arranged over a second end hole of a first support link, said slot also receiving an opposite end of said cam follower in said slot, said cam follower pin being slidable in said slot. Improved overload protection for motion limiting devices. 12. The improved overload protection device of claim 11, wherein the first and second support links are used in cam motion limiting devices of the same length. 12. The apparatus of claim 11, wherein in the first operating position, the cam follower lies outside of an imaginary line drawn through the first end of the first and second support links and in the second operating position. Cam follower is an improved overload protection device used for the cam motion limiting device located inside the virtual line. An overload protection device used in a mutually coupled cam motion device that drives an actuating member to reciprocate in two opposite directions, the cam motion device comprising a linear guide assembly for guiding a connected actuating member to the reciprocating motion, and the cam being rotated. A cam rotatable further comprising: a rotatable cam for driving said actuating member to reciprocate, said cam species rotatably mounted to said actuating member and positioned in said cam movement device to provide contact between said cam and said actuating member; In the overload protection device used for the cam motion device further comprising a winter, A folding toggle assembly for supporting the cam follower in a connected state between the cam and the actuating member while the cam motion limiting device is in operation, wherein the actuating member encounters a resistance exceeding a set value during movement in one direction. The folding toggle assembly folded when released to release the contact between the cam and the cam follower to stop the actuating member from moving in one of the two directions; The folding toggle assembly includes a base portion mounted to the actuating member, the base portion having two free ends extending from the base portion toward the cam and separated by an interspace of the base portion; Two interlocking devices disposed on opposite sides of the base portion and rotatably connected to both free ends of the toggle assembly, over the base portion on opposite sides of the interspace of the base portion, the actuating member being reciprocating The cam follower extends from the toggle assembly base portion to support the cam follower rotatably between the two linkages in a first operating position in contact with the cam and the actuating member is in one direction. And folds toward the toggle assembly base portion on the linkage when encountering a resistive force exceeding a set value, such that the cam follower moves to a second operating position where the contact with the cam is released. Room used for cam movement including two interlocks Device.