JP2010198868A - Electromagnetic relay and control device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay to realize stable contact operation. <P>SOLUTION: In the electromagnetic relay 1 in which a contact and b contact are respectively arranged and installed at respective sides of the center line of a card extending in a slide direction 82 of the card and driven by the common card, a guide piece 90 is formed in an engaging hole 81 of the card 8, while a groove 66 is formed in a tongue piece 65 of an armature 6. Then, on a mounting face of the tongue piece 65 that is on the bottom face 66a of the groove 66, protruding strips 66b, 66c extending in a direction orthogonal to the slide direction 82 are formed, grooves 90b, 90c corresponding to them are formed on the mounting face of the card 8 that is on the bottom face 90a of the guide piece 90, and a play between the tongue piece 65 and the engaging hole 81 is suppressed. By this, rotation in E-shaped direction generated in the card 8 by a difference between right and left contact states is suppressed, and stable slide operationa can be realized. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electromagnetic relay and a control device using the same, and more particularly to the so-called safety relay.

  The safety relay is configured to drive contacts having opposite open / close states, that is, a NO (normally open (a)) contact and an NC (normally closed (b)) contact with a common electromagnet, armature and card. When one contact is welded, the card does not move, and therefore the other contact does not open and close, and the welding of the one contact can be detected by the other contact. Therefore, such a safety relay has high safety and is used in combination with a plurality of stages in a control device for controlling a machine tool or the like, and safety measures are taken.

  Such a safety relay has been realized so far by, for example, four contacts as shown in Patent Document 1 and Patent Document 2 by the applicant, for example, 3a1b, 2a2b, or 1a3b, or shown in Patent Document 3 by the applicant. Such six contacts, for example, 5a1b and 3a3b have been realized. However, there are cases where many such contacts are not required. For example, as shown in Patent Document 4, an example of two contacts has been proposed. However, according to Patent Document 4, in order to make two contacts out of the four contacts 3a1b or 2a2b, the coil side is left, that is, two contacts are formed by 1a1b or 2a.

International Publication No. 06-006557 Pamphlet JP 2000-257882 A Japanese Patent Laid-Open No. 2006-196381 JP-A-11-339624

  FIG. 8 shows the structure of the electromagnetic relay 101 when the safety relay has the minimum contact configuration of 1a1b from the above-mentioned 4 contacts or 6 contacts. In this electromagnetic relay 101, the armature 103 is oscillated and displaced by the electromagnet 102, and the oscillating displacement is changed to the slide displacement in the direction of the arrow 105 of the card 104 and the opposite direction by the card 104 engaged with the armature 103. The contact state is switched when the movable contacts 106 and 107 engaged with the card 105 are brought into contact with or separated from the fixed contacts 108 and 109. The contacts 104 and 108 are normally open (a) contacts, and the contacts 107 and 109 are normally closed (b) contacts. When the electromagnet 102 is in a non-excited state, the card 104 is shown in FIG. As shown by 8, it is retracted in the direction opposite to the arrow 105, the contacts 107 and 109 are ON, and the contacts 106 and 108 are OFF. In contrast, when the electromagnet 102 is excited, the card 104 advances in the direction of the arrow 105 against the elastic force of the return spring 110, the contacts 107 and 109 are turned off, and the contacts 106 and 108 are turned on. To do.

  Here, when the number of sets of contact states that are equal to each other is different between the one side and the other side of the center line 111 of the card 104 that extends in the sliding direction of the card 104 (the arrow 105 and the opposite direction). (In FIG. 8, there is no pair of the same contact state with a minimum of a1 and b1, respectively.) When the card 104 is not energized, the b contacts 107 and 109 side are engaged with the card 104. The elastic force of the fixed contact 109 that is in contact with the contact 107 is also generated, whereas the elastic force of the movable contact 106 that is engaged with the card 104 is on the a contact 106, 108 side. Only has occurred. For this reason, the card 104 has an arrow 112 centered on the tongue 103a of the armature 103 engaged with the engagement hole 104a of the card 104 or the intermediate point of the pair of return springs 110. A rotational force in the yaw direction is generated. As a result, the amount of overtravel (pushing) of the movable contact 106 is lost, and there is a problem that stable contact operation cannot be performed. That is, even if the card 104 is pushed in the direction of the arrow 105 and the movable contact 106 comes into contact with the fixed contact 108 and then further travels, for example, 0.1 mm, the movable contact 106 is rotated by the arrow 112. Escapes from the fixed contact 108, and the actual pushing amount is only 0.07 mm.

  On the other hand, when the engagement hole 104a is formed to be large with respect to the tongue piece 103, the play (backlash) of the card 104 increases, and the contact state differs between the left and right groups. If the rotation of the yaw direction is generated and the engagement hole 104a is formed small with respect to the tongue 103, the play of the card 104 can be reduced and the rotation can be suppressed, but the sliding operation of the card 104 And friction powder is generated at the contact portion.

  An object of the present invention is to engage a movable contact with a card that is slid and displaced by an armature driven by an electromagnet, so that the movable contact is bent and deformed to contact or separate from a fixed contact, and the card slides. In a relay in which the number of sets of the same contact state is different between one side of the center line extending in the direction and the other side, an electromagnetic relay capable of suppressing the rotation of the card and realizing stable contact operation, and It is to provide a control device to be used.

  In the electromagnetic relay of the present invention, an armature is oscillated and displaced by an electromagnet, and the oscillating displacement is converted into a slide displacement of the card by a card that engages with the armature, and a movable contact that is engaged with the card. The contact state is switched by contacting or separating from the fixed contact, and the set of the movable contact and the fixed contact is disposed on both sides of the center line of the card extending in the sliding direction of the card, In the electromagnetic relay in which the number of sets of the same contact state is different between the side and the armature, the armature is formed with a plate-like tongue piece that engages with the card, and the sliding direction of the card is the thickness direction, The card is formed with an engagement hole into which the tongue piece is fitted, and the tongue piece or a portion in the vicinity thereof carries and supports the card, and one of a protrusion or a corresponding concave groove is formed on the mounting surface. Is The mounting surface of the corresponding card, characterized in that the other of said protrusion or groove is formed.

  According to said structure, it implement | achieves as what is called a safety relay etc., and it has at least 1 set of the normally open and normally closed which become a mutually opposite contact state, ie, a contact of a and b, and each said contact is mutually opposing The movable contact engages with a card that is slid and displaced by an armature driven by an electromagnet, and the movable contact is bent and deformed to contact or separate from the fixed contact. The plurality of sets of contacts are disposed on both sides of the center line of the card extending in the sliding direction of the card, and the number of sets of the same contact state is different between one side and the other side. In an electromagnetic relay having a pair of contact points that differ between the left and right groups, such as 3a1b and 5a1b, the number of contact groups is 1a1b at the minimum and increases. Reduce the play of the engaging portion between the child and the card. Specifically, the armature is formed with a plate-like tongue piece whose card slide direction is the thickness direction, and the card is formed with an engagement hole into which the tongue piece fits. When the card is mounted and supported on the tongue piece or the vicinity thereof, one of the ridge or the corresponding concave groove is formed on the mounting surface, and the card mounting surface corresponding to the card The other of the ridge or the groove is formed.

  Here, on the contact side that is in contact, the elastic force of the two contacts of the movable contact and the fixed contact acts on the card, whereas on the contact side that is separated, only the movable contact Elasticity is acting. Therefore, if the engagement hole is formed in a large size with respect to the tongue piece, the play (backlash) of the card becomes large, and due to the difference in the resilience between them, the rotation of the card in the yaw direction occurs, and the movable contact The overtravel (push-in) amount is lost and stable contact operation cannot be performed. On the other hand, if the engagement hole is formed small with respect to the tongue piece, the play (play) of the card can be reduced and the rotation can be suppressed, but the card slide operation is restricted (biting occurs). ) In addition, friction powder is generated at the contact portion. On the other hand, by providing protrusions and concave grooves on the mounting part as described above, and by restricting the rotation of the card by fitting them, the relationship between the size of the tongue piece and the engagement hole, A stable sliding operation can be realized, and the size can be increased to such an extent that friction can be minimized, and a stable contact operation can be realized.

  In the electromagnetic relay of the present invention, a guide piece extending in the sliding direction is formed in the engagement hole, and a groove extending in the sliding direction is formed in the tongue piece. The protrusions extending in the sliding direction are formed on the bottom surface of the groove, and the concave grooves are formed on the bottom surface of the guide piece.

  According to said structure, the guide piece formed in the engagement hole fits in the groove | channel formed in the tongue piece, the said card | curd is supported by a tongue piece, and the protrusion formed in the groove | channel is formed in the bottom face of a guide piece. The rotation (twist) of the card can be regulated by fitting into the recessed groove.

  Furthermore, in the electromagnetic relay of the present invention, a guide piece extending in the slide direction is formed in the engagement hole, and a groove extending in the slide direction is formed in the tongue piece. The protrusions extending in the direction perpendicular to the sliding direction are formed on the bottom surface of the groove, and the concave grooves are formed on the bottom surface of the guide piece.

  According to said structure, the guide piece formed in the engagement hole fits in the groove | channel formed in the tongue piece, the said card | curd is supported by a tongue piece, and the protrusion formed in the groove | channel is formed in the bottom face of a guide piece. The rotation (twist) of the card can be regulated by fitting into the recessed groove.

  In the electromagnetic relay of the present invention, one set of the contacts is provided in the sliding direction of the card.

  According to the above configuration, the safety relay having the minimum contact configuration of 1a1b is particularly preferable because the length of the card in the sliding direction is short and the card is easy to rotate.

  Furthermore, the electromagnetic relay according to the present invention further includes a return spring provided between the armature and the movable contact and locked to the card.

  According to said structure, the floating from the tongue piece of a card | curd can be prevented and the said mounting surface can be stuck.

  Therefore, the fitting state of the protrusion and the groove can be reliably maintained, and the rotation of the card can be further suppressed.

  Moreover, the control device of the present invention uses the above-described electromagnetic relay.

  According to said structure, the contact operation of the control apparatus which controls a machine tool, a line, etc. can be stabilized.

  As described above, the electromagnetic relay of the present invention is realized as a so-called safety relay or the like, and includes at least one set of normally open and normally closed contacts that are in opposite contact states with each other. The movable contact engages with a card that is composed of a contact and a movable contact and is slid and displaced by an armature driven by an electromagnet, whereby the movable contact is bent and deformed to contact or separate from the fixed contact. In the electromagnetic relay in which the contacts of the set are arranged on both sides of the center line of the card extending in the sliding direction of the card and the number of sets in the same contact state is different between one side and the other side, the armature When the card is formed with a plate-like tongue piece whose sliding direction is the thickness direction, and correspondingly, the card is formed with an engagement hole into which the tongue piece is fitted. The card is mounted and supported on the tongue piece or the vicinity thereof, and one of a protrusion or a corresponding groove is formed on the mounting surface, and the protrusion or recess is formed on the corresponding mounting surface of the card. The other of the grooves is formed.

  Therefore, the rotation of the card is regulated by the fitting between the protrusion and the concave groove, the size relationship between the tongue piece and the engagement hole is realized, the stable sliding operation is realized, and the friction is minimized. Therefore, it is possible to realize a stable contact operation.

  Moreover, the control apparatus of this invention uses the said electromagnetic relay as mentioned above.

  Therefore, it is possible to stabilize the contact operation of the control device that controls the machine tool or the line.

1 is an exploded perspective view of an electromagnetic relay according to an embodiment of the present invention. It is a perspective view which shows the assembly state of FIG. FIG. 3 is a plan view of FIG. 2. It is a longitudinal cross-sectional view for demonstrating operation | movement of the said electromagnetic relay. It is sectional drawing of the engaging part vicinity of the tongue piece of the armature which concerns on one Embodiment of this invention, and the engagement hole of a card | curd. It is sectional drawing of the engaging part vicinity of the tongue piece of the armature which concerns on the other form of implementation of this invention, and the engagement hole of a card | curd. It is sectional drawing of the engaging part vicinity of the tongue piece of the armature which concerns on the further another form of implementation of this invention, and the engagement hole of a card | curd. 1 is a longitudinal cross-sectional view of a typical prior art relay.

(Embodiment 1)
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In the following description, the vertical direction will be described with reference to FIG. 1 is an exploded perspective view of an electromagnetic relay 1 according to an embodiment of the present invention, FIG. 2 is a perspective view showing an assembled state thereof, and FIG. 3 is a plan view of FIG. The electromagnetic relay 1 is a safety relay having a minimum contact configuration including one a (normally open: NO) contact 2 and one b (normally closed: NC) contact 3. Hereinafter, for the sake of convenience, the arrangement direction of the contacts 2 and 3 is defined as the left-right direction. The electromagnetic relay 1 generally includes a body 4, an electromagnet block 5, an armature block 6, a return spring 7, a card 8, a cover 9, and the contacts 2 and 3. .

  The body 4 is made of a molded product such as PBT having insulating properties and flame retardancy, and has a longitudinal base 41 on which one end of the electromagnet block 5 is mounted, and a pair standing upright at a substantially central portion of the base 41. Side walls 42, 43, a connecting member 44 that connects and reinforces the side walls 42, 43 to the electromagnet block 5 side, an insulating partition 45 that connects the side walls 2, 43 to the contacts 2, 3 side, and the insulating partition 45 is provided with an insulating partition wall 46 extending from the center of 45 and partitioning the contacts 2 and 3, and a terminal block 47 for holding the contacts 2 and 3 on the other end side of the base 41. The armature block 6 and the return spring 7 are accommodated in a region defined by the side walls 42 and 43 and the insulating partition wall 45, and the terminals 21 and 22; And the card 8 slides and displaces on the insulating partition wall 45.

  FIG. 4 is a longitudinal sectional view of the electromagnetic relay 1. The cover 9 is omitted. According to FIG. 4, the structures of the electromagnet block 5 and the armature block 6 are clear. According to this, the electromagnet block 5 includes a coil 51, a spool 52 around which the coil 51 is wound, an iron core 53 having a substantially L-shaped yoke 54, 55 inserted into the center hole of the spool 52, A pair of coil terminals 56 erected on a flange portion 52a on the lower side of the spool 52 are provided. Each end of the coil 51 is connected to the upper side of each coil terminal 56, and the lower side is press-fitted into the base 41 and protrudes to the outside as a terminal.

  The armature block 6 includes a sub-card 61 made of a plastic product, a movable plate 62 made of soft iron, and a permanent magnet 63 having a rectangular parallelepiped shape. The movable plate 62 is formed in a rectangular flat plate shape and bonded to the sub card 61. The permanent magnet 63 is fixed to the surface of the movable plate 62. As shown in FIG. 1 and FIG. 2, a pair of pins 64 are erected on both the left and right side surfaces of the sub card 61, and these pins 64 fit into holes 48 formed in the side walls 42 and 43 of the base 41, respectively. Thus, the armature block 6 is held so as to be swingable and displaceable in the arrow 69 and the opposite direction. When the armature block 6 is attached to the base 41, the upper end portion of the movable plate 62 faces the upper yoke 54 of the electromagnet block 5 and the lower end portion faces the lower yoke 55 of the electromagnet block 5. A tongue piece 65 extends from the upper end portion of the sub card 61, and the tongue piece 65 engages with an engagement hole 81 formed in the card 8. Displacement driving in the opposite direction is possible.

  The return spring 7 is formed in a substantially Y shape as shown in FIG. 1 by punching and bending a thin metal plate having elasticity, and a lower end 71 whose rigidity is increased by folding (overlapping) is shown in FIG. As shown in FIG. 4, the base 41 is press-fitted between the armature block 6 and the insulating partition 45, and the tip portions 75 and 76 of the bifurcated upper end portions 73 and 74 are inserted into the return spring holes 83 and 84 of the card 8. Thus, the card 8 is elastically biased in the direction opposite to the arrow 82 and so as not to cause rotation in the yaw direction indicated by the arrow 85 and the opposite direction. The lower end 71 is formed with protrusions 71 a and 71 b for preventing the base 41 from coming off.

  The contacts 2 and 3 include a pair of fixed contact terminals 21 and 31 and movable contact terminals 22 and 32. These terminals 21, 22; 31, 32 are formed by punching a thin metal plate having elasticity and bent in a crank shape in a side view, and are movable among the bent parts 21 a, 22 a; 31 a, 32 a. The contact terminals 22 and 32 are doubled by folding the metal plate in order to increase rigidity. Then, on the other end side of the base 41, the bent portions 21a, 22a; 31a, 32a are press-fitted into mounting grooves 49 formed on both sides, and further fixed with an adhesive, whereby the terminals 21, 22 are inserted. The rotation of the arrows 32 and 32 in the yaw direction opposite thereto is restrained, and they are implanted so as to face each other in parallel. The lower ends 21b, 22b; 31b, 32b of these terminals 21, 22; 31, 32 become relay terminals by projecting from the base 41, and the upper arms 21c, 22c; 31c, 32c having elasticity The contact members 21d, 22d; 31d, 32d are fixed by caulking.

  In order to give the fixed contact terminals 21 and 31 rigidity, ribs 21e and 31e are formed in the lower portions of the contact members 21d and 31d in the upper arm portions 21c and 22c. These contact members 21d, 22d; 31d, 32d are configured to be in contact with each other in a substantially parallel manner by generating a deflection due to the pressing of 32 at the base end portion on the base 41 side. On the other hand, in the upper arm portions 22c and 32c of the movable contact terminals 22 and 32, slits 22e and 32e are formed in the portion on the base 41 side so that they are easily bent. The slits 22e and 32e need not be provided. And in the storage space of the contacts 2 and 3 partitioned by the insulating partition wall 46, the contact members 21d and 22d; 31d and 32d that are in contact with each other are opened (separated), and the contact gap is 0.5 mm at the time of welding. In order to ensure the above, and in order to prevent a short circuit when the return spring 7 is broken, an insulating partition 40 for separation is provided upright from the base 41 between the terminals 21, 22;

  When the coil 51 is not energized, the card 8 is displaced in the direction of the electromagnet block 5, that is, in the direction opposite to the arrow 82 by the elastic force of the return spring 7. The fixed contact terminal 21 and the movable contact terminal 32, and the movable contact terminal 22 and the fixed contact terminal 31 are disposed on a line that is displaced and orthogonal to the sliding direction. In addition, on the b (normally closed: NC) contact 3 side, the fixed contact terminal 31 is arranged inward and the movable contact terminal 32 is arranged on the outside, and on the contrary, on the a (normally open: NO) contact 2 side, it is movable. The contact terminal 22 is disposed inward and the fixed contact terminal 21 is disposed outward, and the distal ends of the upper arm portions 22c and 32c of the movable contact terminals 22 and 32 are engaged with the engagement holes 86 and 87 of the card 8. Tongue pieces 22f and 32f. Projections 22g and 32g are formed on the tongue pieces 22f and 32f. Correspondingly, projections 86a, 86b and 86c; 87a, 87b and 87c are formed in the locking holes 86 and 87; Retaining is performed.

  The card 8 is generally formed in a U-shape, and the engagement hole 81 and the pair of left and right return spring holes 83 and 84 for the sub card 61 are connected to the U-shaped connecting portion 80 in a pair of left and right. The locking holes 86 and 87 are formed on the U-shaped arm portions 88 and 89 side. As described above, the card 8 is mounted and supported by the tongue piece 65 of the sub card 61, the tip portions 75 and 76 of the return spring 7, and the tongue pieces 22f and 32f of the movable contact terminals 22 and 32. And the height of the upper end surface 45a of the insulating partition 45 is a droop formed from the inner facing surfaces 88c, 89c of the arm portions 88, 89 so as not to come into contact with the back surfaces on the base end side of the arm portions 88, 89. The height of the step surface 46a formed on the upper end side of the insulating partition wall 46 is set so as not to contact the lower end surfaces 88b and 89b of the pieces 88a and 89a.

  Further, the following two points are performed as the guide for the slide displacement. First, the upper end portion 46b of the insulating partition wall 46 is sandwiched between the hanging pieces 88a and 89a, and is formed by hanging from the top plate 91 of the cover 9 between the inner facing surfaces 88c and 89c of the arm portions 88 and 89. The guide 91a is sandwiched. Next, the lower end surface 91b of the guide 91a fits into stepped portions 88d and 89d generated by forming the hanging pieces 88a and 89a on the inner facing surfaces 88c and 89c of the arm portions 88 and 89, respectively.

  The cover 9 is made of a resin molded product such as transparent polycarbonate, and is formed in a box shape with an open bottom so that the open / close state of the contact members 21d, 22d; 31d, 32d can be confirmed, and is shown in FIG. The parts are put on the body 4 in an assembled state from above, and the inner peripheral surface at the lower end is bonded to the base 41.

  In the electromagnetic relay 1 configured as described above, when the coil 51 is in a non-energized state, as shown in FIGS. 2, 3, and 4 (a), the contact force is generated by the elastic force of the return spring 7 through the card 8. The pole block 6 is biased in the direction of the arrow 69, whereby the card 8 is slid in the direction opposite to the direction of the arrow 82, that is, the electromagnet block 5, and the movable contact terminal that is hooked by the card 8. 22 and 32 are also bent and deformed in the direction opposite to the direction of the arrow 82, that is, the electromagnet block 5 side. As a result, the b (NC) contact 3 side is conducted and the a (NO) contact 2 side is shut off.

  In contrast, in the energized state of the coil 51, the armature block 6 is opposite to the direction of the arrow 69 against the elastic force of the return spring 7 via the card 8, as shown in FIG. The card 8 is slid in the direction of the arrow 82, that is, opposite to the electromagnet block 5, and the movable contact terminals 22 and 32 hooked by the card 8 are also in the direction of the arrow 82. That is, it is bent and deformed on the side opposite to the electromagnet block 5. As a result, the b (NC) contact 3 side is cut off and the a (NO) contact 2 side is conducted.

  It should be noted that in the electromagnetic relay 1 of the present embodiment, a plurality of contacts 2 and 3 are arranged on both sides of the center line 8x of the card 8 extending in the sliding direction 82 of the card 8, and one side and the other side are arranged. In the electromagnetic relay in which the number of sets of the same contact state is different from each other, a guide piece 90 extending in the sliding direction is formed in the engagement hole 81, and the tongue piece 65 has a tip-like shape. The guide piece 90 is fitted and a groove 66 extending in the sliding direction is formed, so that the card 8 is mounted and supported on the tongue piece 65 as shown in an enlarged view in FIG. As shown in FIG. 5B and FIG. 5C, protrusions 66b and 66c extending in a direction orthogonal to the sliding direction are formed on the mounting surface of the tongue piece 65, that is, the bottom surface 66a of the groove 66, Corresponding concave grooves 90b, 90c are formed in the card 8 Surface, i.e., by forming the bottom surface 90a of the guide piece 90 is to suppress the play between the tongue 65 and the engaging hole 81.

  FIG. 5A is an enlarged cross-sectional view showing an engaging portion between the tongue piece 65 and the engaging hole 81, and FIGS. 5B and 5C show the protrusions 66b and 66c and the concave groove. It is sectional drawing which shows the example of a shape of 90b, 90c. The tip of the ridge 66b shown in FIG. 5 (b) is sharp like a knife edge, the tip of the ridge 66c shown in FIG. 5 (c) is chamfered, and the concave grooves 90b and 90c are respectively formed on them. Corresponding concave shape is formed.

  A concave groove may be formed on the bottom surface 66a of the groove 66, and a protrusion may be formed on the bottom surface 90a of the guide piece 90. As shown in FIG. The protrusions 66b and 66c may be formed on the side portions, and the concave grooves 90b and 90c may be formed on the peripheral edge portion of the engagement hole 81 of the card 8.

  Here, the elastic force of the two contacts of the movable contact and the fixed contact acts on the card 8 on the contact side that is in contact, whereas only the movable contact is on the contact side that is separated. The resilience of is acting. Therefore, when the engagement hole 81 is formed to be large with respect to the tongue piece 65, the play (backlash) of the card 8 becomes large, and the arrow 85 or its The yaw rotation in the reverse direction occurs, the amount of overtravel (pushing) of the movable contact terminals 22 and 32 is lost, and stable contact operation cannot be performed. On the other hand, if the engagement hole 81 is formed small with respect to the tongue piece 65, play (backlash) of the card 8 can be reduced and the rotation can be suppressed, but the sliding operation of the card 8 is restricted (biting). In addition, friction powder is generated at the contact portion. On the other hand, as in the present embodiment, a guide piece 90 is formed in the engagement hole 81, a groove 66 is formed in the tongue piece 65, and the card 8 is mounted and supported on the tongue piece 65. One of the protrusions 66b and 66c or the concave grooves 90b and 90c is formed on the mounting surface of the groove 66, and the other mounting surface of the corresponding protrusions 66b and 66c or the concave grooves 90b and 90c is formed on the corresponding mounting surface of the card 8. , The rotation of the card 8 is restricted, and the relationship between the width of the tongue piece 65 and the width of the engagement hole 81 and the relationship between the width of the guide piece 90 and the width of the groove 66 are stabilized. It is possible to set the gap so that the operation can be realized and the friction can be minimized, and a stable contact operation can be realized.

  It should be noted that, as shown in FIG. 1, protrusions 75a and 76a are formed at the tip portions 75 and 76 of the return spring 7, respectively, and the return spring holes 83 and 84 are shown in FIG. As described above, the protrusions 83a, 83b, 83c; 84a, 84b, 84c that contact the tip portions 75, 76 in the thickness direction are formed to serve as locking holes. As described above, the return spring 7 is formed by punching and bending a thin metal plate having elasticity, and the protrusions 75a and 76a are formed by processing the sheet metal. As described above, the lower end 71 is secured to the base 41 by the projections 71a and 71b, and the distal end portions 75 and 76 are engaged with the return spring holes 83 and 84, so that the tongue piece 65 of the card 8 is removed. The mounting surface can be brought into close contact with each other. Thereby, the effect of preventing rotation by the protrusions 66b and 66c and the concave grooves 90b and 90c can be further exhibited.

  In the above-described embodiment, the a (NO) contact 2 and the b (NC) contact 3 are respectively provided on each side of the center line 8x with the minimum 1a1b contact configuration. As described above, the present invention can be applied to a configuration in which the number of sets of the same contact state is different between one side and the other side of the center line 8x. For example, in the case of 3a1b, there is a row in which one side of the center line 8x is an a contact and the other side is a b contact as described above. On the other hand, in the case of 2a2b, for example, when the first row is aa and the second row is bb, the number of sets of the same contact state is equal on both sides of the center line 8x, but one side of the center line 8x If aa is aligned and arranged on the other side and bb is aligned, the number of sets of the same contact state is different on both sides of the center line 8x. However, the safety relay with the minimum configuration of 1a1b is particularly suitable because the length L in the sliding direction of the card 8 is short, and thus the card 8 is easy to rotate.

(Embodiment 2)
FIG. 7 is a cross-sectional view of the vicinity of the engaging portion between the tongue piece and the engaging hole according to still another embodiment of the present invention. It should be noted that in the present embodiment, the protrusions 66b ′ and 66c ′ and the concave grooves 90b ′ and 90c ′ are formed extending in the sliding direction. Even with this configuration, the rotation (twist) of the card 8 can be restricted.

  By using such a safety relay for a control device that controls a machine tool, a line, etc., the contact operation can be stabilized, which is preferable.

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 a (normally open: NO) contact 3 b (normally closed: NC) contact 21, 31 Fixed contact terminal 22, 32 Movable contact terminal 21c, 22c; 31c, 32c Upper arm part 21d, 22d; 31d, 32d Contact Members 21e, 31e Ribs 22e, 32e Slit 4 Body 40, 45, 46 Insulating partition 41 Base 47 Terminal block 5 Electromagnet block 51 Coil 52 Spool 53 Iron core 54, 55 Yoke 6 Armature block 61 Sub card 62 Movable plate 63 Permanent magnet 65 Tongue piece 66 groove 66a bottom surface 66b, 66c; 66b ', 66c' protrusion 7 return spring 71 lower end 73, 74 upper end 75, 76 tip 75a, 76a protrusion 8 card 80 connection part 81 engagement hole 83, 84 return Spring holes 83a, 83b, 83c; 84a, 84b, 84c Protrusions 86, 87 Locking holes 88, 89 Arm 88a, 89a suspended piece 9 cover 90 guide piece 90a bottom surface 90b, 90c; 90b ', 90c' groove 91 top plate 91a guides

Claims (6)

The armature is oscillated and displaced by the electromagnet, and the oscillating displacement is converted into a slide displacement of the card by the card that engages the armature, and the movable contact that is engaged with the card contacts or separates from the fixed contact. In this way, the contact state is switched, and the set of the movable contact and the fixed contact is disposed on both sides of the center line of the card extending in the sliding direction of the card, and is the same between one side and the other side. For electromagnetic relays with different numbers of contact states,
The armature is formed with a plate-like tongue that engages with the card and the sliding direction of the card is the thickness direction,
The card is formed with an engagement hole into which the tongue piece fits,
The tongue piece or the vicinity thereof supports and mounts the card, and one of a protrusion or a corresponding concave groove is formed on the mounting surface, and the protrusion or concave groove is formed on the corresponding mounting surface of the card. An electromagnetic relay, wherein the other is formed.   A guide piece extending in the slide direction is formed in the engagement hole, and the guide piece is fitted into the tongue piece, and a groove extending in the slide direction is formed, and the slide direction is formed on the bottom surface of the groove. 2. The electromagnetic relay according to claim 1, wherein the protrusion extending in the direction is formed, and the concave groove is formed in a bottom surface of the guide piece.   A guide piece extending in the slide direction is formed in the engagement hole, and the guide piece is fitted into the tongue piece, and a groove extending in the slide direction is formed, and the slide direction is formed on the bottom surface of the groove. 2. The electromagnetic relay according to claim 1, wherein the protrusions extending in a direction perpendicular to the groove are formed, and the concave groove is formed on a bottom surface of the guide piece.   4. The electromagnetic relay according to claim 1, wherein one set of the contacts is provided in a sliding direction of the card. 5.   The electromagnetic relay according to any one of claims 1 to 4, further comprising a return spring provided between the armature and the movable contact and locked to the card.   A control device using the electromagnetic relay according to claim 1.

Images