JPH08276325A - Pin press fitting device - Google Patents

Abstract

PURPOSE: To press in and fit a pin securely to a pin hole, by press fitting the pin in the condition maintaining the posture of the pin. CONSTITUTION: This pin press fitting device is composed of a pin posture holding member 32 where each holding groove 33 to hold the posture of each contact pin 8 placed tentatively to each pin hole 4 of an insulating cover 3 is provided; a pin pressing-in member 34 where each pressing-in plate 35 to press and press fit each contact pin 8; and a holding member 36 to hold the pin posture holding member 32 movable vertically at the lower side of the pin pressing-in member 34. As a result, each contact pin 8 can be pressed in to each pin hole 4 accurately, by pressing each contact pin 8 by each pressing-in plate 35 moving to the lower side in each holding groove 33, while holding the posture of each contact pin 8 placed tentatively to each pin hole 4 of the insulating cover 3 by each holding groove 33 of the pin posture holding member 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pin press-fitting device suitable for press-fitting a pin such as a contact pin into a pin hole formed in a press-fitted member such as an insulating cover of an oxygen sensor.

[0002]

2. Description of the Related Art Generally, in order to press-fit a pin into a pin hole formed in a member to be press-fitted, the member to be press-fitted with the pin temporarily placed in the pin hole is placed on a press table of a press means, By lowering the raising / lowering member of the pressing means, the pin is pressed by the pushing member or the like attached to the raising / lowering member and press-fitted into the pin hole. And, as the press-fitted member having the pin hole and the pin press-fitted into the pin hole,
For example, an insulating cover used for an oxygen sensor and a contact pin that is press-fitted into a pin hole of the insulating cover can be used.

Therefore, an oxygen sensor having an insulating cover in which contact pins are press-fitted into pin holes will be described with reference to FIGS.

In the figure, reference numeral 1 denotes a casing of an oxygen sensor, which comprises a stepped cylindrical holder 1A and a bottomed cylindrical cap 1B integrally fixed to the base end side of the holder 1A. And these are made of a metallic material such as stainless steel. Then, the casing 1 is screwed to the exhaust pipe so as to project a detection element 6 described later into the exhaust pipe (not shown) of the automobile engine.

Reference numeral 2 denotes a stepped tubular insulating cylinder provided in the casing 1, and 3 denotes an insulating cover as a press-fitted member provided in the casing 1 together with the insulating cylinder 2, The insulating cylinder 2 and the insulating cover 3 are made of a ceramic material such as alumina.

As shown in FIG. 6, the insulating cover 3 has a large diameter portion 3A and a stepped portion 3 at the base end side of the large diameter portion 3A.
A small-diameter portion 3C formed by reducing the diameter through B, and a large-diameter fitting hole 3D formed to open at the tip end side of the large-diameter portion 3A and into which the base end side of the insulating tubular body 2 is fitted. It is formed into a stepped cylindrical shape with a small diameter fitting hole 3E into which a base end side of a ceramics heater 7 described later is fitted. Further, the insulating cover 3 has pin holes 4 into which contact pins 8 to be described later are fitted.
4 and a pin hole 5 into which a contact plate 9 described later is fitted are provided at intervals of 120 degrees, for example.

Of the pin holes 4 and 5, each pin hole 4 has a support groove portion 4A for radially supporting the contact portion 8A of the contact pin 8 and a shoulder portion 4B for abutting on the crank portion 8B. And a fitting hole 4C formed by penetrating the small diameter portion 3C through the pin 8C of the contact pin 8 is press-fitted into the fitting hole 4C.

6, the base end side is mounted in the holder 1A,
The tip side shows an oxygen concentration detecting element protruding outside the holder 1A, and the detecting element 6 is formed of a ceramic material such as zirconium oxide as a bottomed cylindrical zirconia tube. Here, inside and outside electrodes (both not shown) are provided on the outer surface of the detection element 6, the inside electrode is connected to the contact plate 9, and the outside electrode is grounded via the holder 1A or the like. There is. When a difference in oxygen concentration occurs between the exhaust gas on the outside and the atmosphere on the inside, the detection element 6 generates an electromotive force between the inner electrode and the outer electrode based on the difference in oxygen concentration, and detects this electromotive force. It is output as a signal.

Reference numeral 7 denotes a small-diameter shaft-shaped ceramics heater penetrating the insulating cylindrical body 2 and extending in the axial direction inside the detecting element 6 at the tip end side.
The contact portion 8A of each contact pin 8 is electrically connected in a state of being fitted in the small diameter fitting hole 3E. The ceramic heater 7 heats the detection element 6 to activate it.

Reference numerals 8 and 8 denote a pair of contact pins located in the insulating cover 3 and provided in the pin holes 4, and each of the contact pins 8 has a contact portion 8A formed in a substantially U shape. The contact portion 8A and the pin portion 8C extending from one end portion side of the contact portion 8A through the crank portion 8B are formed in a substantially hook shape. Further, in each contact pin 8, the pin portion 8C is aligned with the fitting hole portion 4C, and in this state, the contact portion 8A is pushed along the support groove portion 4A until the crank portion 8B contacts the shoulder portion 4B. The other end, which is the free end of the contact portion 8A, is arranged so as to face inward. Further, each contact pin 8 is made of a metal material having both conductivity and spring property, whereby the free end side of the contact portion 8A is electrically connected to the ceramic heater 7 with spring property.

Reference numeral 9 denotes a contact plate which is inserted into the insulating cylinder 2 and the insulating cover 3. The contact plate 9 has a base end side press-fitted into a pin hole 5 formed in the insulating cover 3 and a tip end side has a detection element. 6 inner electrodes. Then, the contact plate 9 outputs the detection signal from the detection element 6 to the output lead wire 10C described later.

Reference numerals 10A, 10B and 10C denote positive and negative power supply lead wires connected to the pin portion 8C of each contact pin 8 and an output lead wire connected to the base end side of the contact plate 9. The power supply lead wires 10A and 10B are for supplying power to the ceramic heater 7 from the outside, and the output lead wire 10C is for outputting the detection signal from the detection element 6 to the outside.

Next, a pin press-fitting device for press-fitting the contact pins 8, 8 into the pin holes 4, 4 of the insulating cover 3 as the above-mentioned press-fitted member will be described with reference to FIGS. 7 and 8.

First, a pin press-fitting device according to the first conventional technique will be described with reference to FIG.

In the figure, reference numeral 11 denotes a pressing mechanism as a pressing means, and the pressing mechanism 11 is a pressing table 12.
And a press ram 13 as an ascending / descending member that is provided above the press base 12 and is capable of ascending / descending. The press ram 13 has a pushing member 16 described later.
Of the connecting shaft 16A is formed in the axial direction, and a set screw 14 for fixing the connecting shaft 16A in the inserting hole 13A is screwed in the radial direction of the inserting hole 13A. It is worn.

Reference numeral 15 denotes a stepped cylindrical positioning holder serving as positioning means fixed on the press table 12, and the inner peripheral side of the positioning holder 15 holds the insulating cover 3 in a positioned state via a stepped portion 3B. It is a holding hole 15A for

Reference numeral 16 denotes a stepped columnar pushing member mounted above the positioning holder 15 and attached to the press ram 13. The upper end side of the pushing member 16 serves as a connecting shaft 16A which is fitted into the fitting hole 13A. The lower end side is a pressing portion 16B that enters into the large-diameter fitting hole 3D of the insulating cover 3.

The pressing portion 16B has engaging grooves 17 and 1 corresponding to the pin holes 4 and 4 so that the lower end surface side thereof is radially cut out.
7 (only one is shown) are formed, and the respective engaging grooves 17 are engaged with the upper portions of the contact portions 8A of the respective contact pins 8 temporarily placed in the respective pin holes 4. The position is maintained to prevent displacement.

The pin press-fitting device according to the first prior art is constructed as described above, and each contact pin 8 is temporarily placed in each pin hole 4 of the insulating cover 3 held in the holding hole 15A of the positioning holder 15. Then, in this state, press ram 13
And the contact portion 8 is pressed by the pressing portion 16B of the pressing member 16 from above. As a result, in the pin portion 8C of each contact pin 8, the crank portion 8B is
It is press-fitted into the fitting hole 4C until it comes into contact with the shoulder 4B. Further, at the time of this press-fitting, since the upper part of the contact portion 8A is engaged with each engaging groove 17 formed in the pressing portion 16B, the press-fitting failure due to the displacement of each contact pin 8 is prevented.

Next, a pin press-fitting device according to the second conventional technique will be described with reference to FIG.

In the figure, reference numeral 21 denotes a pushing member used in place of the pushing member 16 described in the first prior art, and the pushing member 21 has an insertion hole 13A for the press ram 13 via a connecting shaft 21A on the upper end side. Is formed in a stepped columnar shape, and the lower end side is a pressing portion 21B that enters into the large diameter fitting hole 3D of the insulating cover 3. A small-diameter shaft 21C that extends downward and enters the small-diameter fitting hole 3E is provided at the center of the pressing portion 21B.
Guide groove 2 notched so as to face the support groove portion 4A of
2, 22 (only one is shown) are formed extending in the axial direction.

The guide grooves 22 are engaged with the free end side of the contact portion 8A of each contact pin 8 temporarily placed in each pin hole 4 so that the contact portion 8A can be pressed in.
It prevents the free end side from shifting.

The structure of the other members is the same as that of the first prior art and will not be described.

The pin press-fitting device according to the second prior art is constructed as described above, and the press ram 13 is lowered to press each contact pin 8 from above by the pressing portion 21B of the pressing member 21. 8 is press-fitted into each pin hole 4. Further, at the time of this press-fitting, the free end side of the contact portion 8A engages with each guide groove 22 formed in the small diameter shaft 21C and moves along each guide groove 22, so that the position of each contact pin 8 Misalignment can be prevented.

[0025]

By the way, in the above-mentioned first prior art, although each contact pin 8 is prevented from being displaced by each engaging groove 17, each contact pin 8 is When the contact portion 8A is press-fitted into the pin hole 4 and the contact portion 8A protrudes from the large-diameter fitting hole 3D of the insulating cover 3 (a portion indicated by an arrow a in FIG. 5), each contact is small. In order to push the pin 8 to this state, the groove depth of each engagement groove 17 cannot be increased.

As a result, since the groove depth of each engaging groove 17 becomes shallow, the engaging groove 17 and the contact portion 8A may be disengaged from each other during press fitting. If press-fitted, there is a problem that the contact pins 8 and the insulating cover 3 are damaged.

In the second conventional technique, the insulating cover 3 is used.
By providing each guide groove 22 that engages with the free end side of each contact portion 8A in the small diameter shaft 21C that enters the small diameter fitting hole 3E, the contact pins 8 are prevented from being displaced during press fitting. .

However, since the contact portion 8A of each contact pin 8 has a spring property inward in the radial direction for connection with the ceramic heater 7, the contact portion 8A comes into contact with the guide groove 22 with a spring property. In this case, after the press-fitting of each contact pin 8, the small diameter shaft 21C
When the is pulled out, the contact pin 8 which is in contact with the guide groove 22 is pulled out together with the small diameter shaft 21C, and there is a problem that the press-fitting cannot be securely performed.

The present invention has been made in view of the above-mentioned problems of the prior art, and by press-fitting the pin while maintaining the posture of the pin, the pin can be securely press-fitted into the pin hole. The purpose is to provide a device.

[0030]

In order to solve the above-mentioned problems, a pin press-fitting device adopted by the invention of claim 1 is a press means comprising an elevating member provided to be movable up and down with respect to a press table, The positioning means is provided on the press table of the pressing means for positioning the press-fitted member in which the pin is temporarily placed in the pin hole, and the lifting means of the pressing means is attached, and the lifting member is lowered. At this time, the pin posture holding means for holding the posture of the pin temporarily placed on the positioning means, and the pin posture holding means for press-fitting the pin held by the pin posture holding means into the pin hole of the press-fitted member And a pin pushing means movably provided therein.

Further, as in the second aspect of the present invention, between the pin posture holding means and the pin pushing means, there is provided a supporting means for supporting the pin posture holding means so that the pin posture holding means can move up and down. Is preferred.

Further, as in the third aspect of the present invention, it is preferable that the supporting means is provided with a return spring that urges the pin attitude holding means downward to return it to the initial position.

[0033]

According to the structure of the invention of claim 1, when the press-fitted member in which the pin is temporarily placed in the pin hole is attached to the positioning means and the elevating member of the pressing means is lowered, the pin posture holding means moves to the pin position holding means. While holding the posture, the pin pushing means moves downward in the pin posture holding means and pushes the pin held by the pin posture holding means downward. As a result, the pin is securely press-fitted into the pin hole by the pin pushing means while the posture is maintained by the pin posture holding means.

According to the second aspect of the invention, the elevating member of the pressing means is moved at a constant speed (single stroke).
When the pin posture holding means holds the posture of the pin and then the pin pushing means moves inside the pin posture holding means through the supporting means, the pin posture holding means moves the pin posture holding means. It is possible to perform a two-step press operation (double stroke) in which the pin is pushed by the pin pushing means while maintaining the above posture.

Further, according to the third aspect of the invention, since the pin posture holding means can be surely returned to the initial position by the return spring, the pin posture holding means holds the pin posture and the pin pushing means press-fits the pin. Can be reliably performed as a continuous operation.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pin press-fitting device according to an embodiment of the present invention will be described below with reference to FIGS. In addition, in the present embodiment, the same components as those of the above-described first conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, 31 indicates a press-fitting mechanism attached to the press ram 13 of the press mechanism 11, and the press-fitting mechanism 31
Is a pin posture holding member 32 and a pin pushing member 3 which will be described later.
4 and the support member 36.

Reference numeral 32 denotes a pin posture holding member which is located above the positioning holder 15 so as to be able to move up and down and is attached to the press ram 13 side. The pin posture holding member 32 has a large-diameter collar portion 32A and the collar portion. An annular step portion 32B provided on the central lower surface side of 32A, and a fitting portion 32C extending downward from the annular step portion 32B and capable of being fitted into the large diameter fitting hole 3D of the insulating cover 3, Pin pushing member 34 located at the axial center
And a through hole 32D through which the small-diameter portion 34C is inserted, and a plurality of screw holes 32E (1 Only one is shown). Further, the pin posture holding member 32 is formed with holding grooves 33, 33 radially outward from the insertion hole 32D.

Here, as shown in FIG. 2, each holding groove 33 is formed up to the inner circumference of the annular step portion 32B at intervals of 120 degrees corresponding to the pin holes 4 and 4 of the insulating cover 3, and the groove width thereof. It is set to be slightly larger than the width dimension of each contact pin 8. Then, each holding groove 33 corresponds to the press ram 13.
Together with the pin posture holding member 32, the fitting portion 32C is lowered.
Is fitted into the large-diameter fitting hole 3D of the insulating cover 3 to hold the contact portion 8A of each contact pin 8 temporarily placed in each pin hole 4 so that the contact pin 8 is positioned. It is to prevent deviation.

Reference numeral 34 denotes a pin pushing member which is located above the pin posture holding member 32 and is attached to the press ram 13. The pin pushing member 34 has a large diameter portion 34A and a large diameter portion 34A. A large diameter portion 34A is formed in a stepped column shape from a medium diameter portion 34B provided and a small diameter portion 34C provided below the medium diameter portion 34B and inserted into the insertion hole 32D of the pin posture holding member 32. A connecting shaft 34D that is inserted into the insertion hole 13A of the press ram 13 is provided on the upper side of the. Further, a flange portion 34E is formed between the large diameter portion 34A and the middle diameter portion 34B so as to project outward in the radial direction, and a plurality of rod portions 39A of the support rod 39 slide on the flange portion 34E. Sliding holes 34F, 34F, ... (only one is shown)
Has been drilled. Further, on the outer peripheral side of the intermediate diameter portion 34B, a pin sliding groove 3 in which a guide pin 38 described later slides is formed.
4G is formed extending vertically.

Further, two pressing plates 35, 35 are provided on the outer peripheral side of the small diameter portion 34C, and each pressing plate 35 corresponds to the pin holes 4, 4 of the insulating cover 3 like the holding grooves 43. It protrudes in the radial direction at intervals of 120 degrees and enters the holding grooves 43 so as to be vertically movable. Further, each pushing plate 35 is set so that its radial projection size is slightly smaller than the supporting groove portion 4A of each pin hole 4.
Then, each pressing plate 35 moves downward in each holding groove 43 when the pin pressing member 34 is lowered together with the press ram 13, so that the pressing surface 35A at the lower end surface of each pressing plate 35 contacts the contact portion 8A of each contact pin 8. The upper part is pressed and press fit into each pin hole 4.

Reference numeral 36 denotes a support member provided between the pin posture holding member 32 and the pin pushing member 34, and the support member 36 is roughly composed of a support cylinder 37, a support rod 39, and a return spring 40 which will be described later. ing.

Reference numeral 37 denotes a support cylinder fixed to the upper surface side of the pin posture holding member 32, and the inner peripheral side of the support cylinder 37 is slidably fitted with the medium diameter portion 34B of the pin pushing member 34. The moving hole 37A is formed, and the lower end side of the support cylinder 37 is enlarged in diameter to form a flange portion 37B. A guide pin 38 is fitted to the support cylinder 37 so as to be located on the upper end side so as to project to the sliding hole 37A side, and the projecting end side of the guide pin 38 slides into the pin sliding groove 34G. By movably engaging with the pin pushing member 34, the pin posture holding member 32
Are positioned in the circumferential direction, and each holding groove 33 and each pushing plate 35
And are aligned.

Denoted by 39, 39, ... are a plurality of support rods (only one is shown) provided between the collar portion 34E of the pin pushing member 34 and the collar portion 32A of the pin posture holding member 32. The support rod 39 includes a rod portion 39A that slides in each sliding hole 34F of the pin pushing member 34, a stopper 39B that is provided on the upper end side of the rod portion 39A and that engages with the upper surface of the flange portion 34E, and the rod. And a threaded portion 39C formed on the lower end side of the portion 39A.
9 is screwed into the screw hole 32E of the pin posture holding member 32 by the screw portion 39C. Then, each support rod 39 has the pin posture holding member 3 with respect to the pin pushing member 34.
The lower limit position of 2 is determined, and the pin posture holding member 32 is held horizontally with respect to the press table 12 in the standby state shown in FIG.

.. are located on the outer peripheral side of the rod portion 39A of each support rod 39, and are provided between the flange portion 32A of the pin posture holding member 32 and the flange portion 34E of the pin pushing member 34. (Only one is shown), each of the return springs 4
0 is for urging the pin posture holding member 32 to return to the lower limit position (initial position) except when press-fitting.

The pin press-fitting device according to this embodiment has the above-mentioned structure, and its operation will be described below with reference to FIGS. 1 to 4.

First, as a preparation for press-fitting each contact pin 8, each contact pin 8 is temporarily placed in each pin hole 4 of the insulating cover 3 held in the holding hole 15A of the positioning holder 15.

Next, when the preparation for press-fitting is completed, the press ram 13 is lowered at a constant speed, and the press-fitting mechanism 31 attached to the press ram 13 is lowered. Then, when the press-fitting mechanism 31 is lowered by a predetermined amount, as shown in FIG. 3, the fitting portion 32C of the pin posture holding member 32 is fitted into the large-diameter fitting hole 3D of the insulating cover 3 in the first step, and the pin is held. Posture holding member 3
The descent of 2 stops. At this time, since the contact portion 8A of each contact pin 8 is disposed in each holding groove 33, each contact pin 8 is held in each holding groove 33 in the correct press-fitting posture.

Next, when the press ram 13 is further lowered, as a second step, the push plates 3 of the pin push member 34 are pushed.
5 moves downward in each holding groove 33 against each return spring 40, and presses the contact surface 8A upper part of each contact pin 8 in each holding groove 33 downward by the pressing surface 35A. As a result, the contact pins 8 are press-fitted into the pin holes 4 until the crank portions 8B come into contact with the shoulder portions 4B as the push plates 35 descend (see FIG. 4). Further, at this time, since the contact portion 8A of each contact pin 8 is held in each holding groove 33, the contact pin 8 is securely press-fitted into each pin hole 4 without tilting its posture during press-fitting. .

When the press fitting of each contact pin 8 into each pin hole is completed, the press ram 13 is raised. At this time, since the pin posture holding member 32 is urged downward by the respective return springs 40, first, the pin pushing member 34 ascends together with the press ram 13, and the stoppers 39B of the respective support rods 39 abut the flange portion 34E. At that time, the pin posture holding member 32 rises together with the pin pushing member 34,
It stops in the standby state shown in.

Thus, according to the present embodiment, when each contact pin 8 is press-fitted into each pin hole 4 of the insulating cover 3, each holding groove 3 of the pin posture holding member 32 is the first step.
3, the contact portions 8A of the contact pins 8 are held so as to be sandwiched, and the contact pins 8 held in the holding grooves 33 are pressed by the pressing plates 35 in the second stage, so that the contact pins 8 are separated from each other. Since it is possible to surely press-fit and fit in the pin hole 4 in the correct press-fitting posture without displacement, it is possible to prevent the contact pins 8 from being displaced in the middle of press-fitting as in the first conventional technique, and to perform insulation. It is possible to prevent damage to the cover 3 and each contact pin 8 and improve yield and productivity.

Further, each contact pin 8 is attached to each holding groove 33.
Since it is held so as to sandwich it from the width direction, it is possible to prevent the free end side of the contact portion 8A from coming into contact with the pin posture holding member 32 with springiness as in the second conventional technique, and to raise the pin posture holding member. 32 with each contact pin 8
It is possible to surely prevent the press-fitting failure in which the product comes off.

Further, in this embodiment, a support member 36 is provided between the pin posture holding member 32 and the pin pushing member 34, and the pin posture holding member 32 is moved up and down with respect to the pin pushing member 34 by the support member 36. By supporting possible,
By simply lowering the press ram 13 at a constant speed (single stroke), each contact pin 8 is held in each holding groove 33 as the first step, and each pushing plate 3 is held as the second step.
Since it is possible to perform a two-stage operation (double stroke) of pressing and press-fitting each contact pin 8 with 5, it is possible to use an inexpensive single-stroke press mechanism 11 and reduce the cost. Moreover, the operation can be facilitated and the workability can be improved.

Further, by providing each return spring 40 for urging the pin posture holding member 32 downward with respect to the pin pushing member 34, when the press-fitting mechanism 31 is in the standby state, each return spring 40 causes the pin to move. Since the posture holding member 32 can be reliably lowered to the lower limit position, the pin posture holding member 32 can be brought into a correct standby state at the time of the next press-fitting, and the holding grooves 33 and the contact pins 8 are displaced from each other. Can be prevented, continuous operation is possible, and productivity can be improved.

On the other hand, the pin sliding groove 3 is formed in the pin pushing member 34.
4G is provided, and a guide pin that slidably engages with the pin sliding groove 34G is fitted into the support cylinder 37 fixed to the pin attitude holding member 32. Therefore, the pin pushing member 3
4, it is possible to prevent the pin posture holding member 32 from being displaced in the circumferential direction, and each holding groove 33 and the pushing plate 3 can be prevented.
5 can be prevented from being caught and abnormal wear can be extended to extend the life.

In the above embodiment, the case where the two contact pins 8 are press-fitted into the respective pin holes 4 has been described as an example. However, for example, one or three or more contact pins are provided in corresponding pin holes. May be applied when press-fitting into
In this case, the pushing plates and the guide grooves may be provided as many as the number of contact pins.

Further, in the above embodiment, the plate-shaped pressing plates 35 are exemplified, but other shapes such as a rod-shaped body may be used as long as they can press and press the contact pins 8.

[0058]

As described above in detail, according to the invention of claim 1, the press-fitted member in which the pin is temporarily placed in the pin hole is attached to the positioning means, and the elevating member of the pressing means is lowered. The pin posture holding means holds the posture of the pin, and in this state, the pin pushing means can be moved downward in the pin posture holding means to push the pin held by the pin posture holding means downward. Therefore, it is possible to securely press fit into the pin hole by the pin pushing means while maintaining the pin posture by the pin posture holding means, prevent the press fitting failure due to the position shift of the pin at the time of press fitting, and improve the productivity and yield. Can be improved.

Further, according to the invention of claim 2, even when the elevating member of the pressing means is lowered at a constant speed (single stroke), first, the pin posture holding means holds the pin posture, and then the pin posture holding means holds the pin posture. Since a two-step press operation (double stroke) of pressing the pin by moving the pin pushing means in the pin posture holding means via the supporting means can be performed, an inexpensive single stroke press is used as the pressing means. Means can be used, the cost can be reduced, and the operation can be facilitated to improve workability.

Further, according to the third aspect of the invention, since the pin attitude holding means can be surely returned to the initial position by the return spring, the pin attitude holding means holds the pin attitude.
It is possible to reliably perform press-fitting of the pins by the pin pushing means as a continuous operation, prevent malfunctions, and improve productivity.

[Brief description of drawings]

FIG. 1 is a sectional view showing an overall configuration of a pin press-fitting device according to an embodiment of the present invention.

FIG. 2 is an enlarged bottom view of a pin posture holding member, push-in plates, etc. as seen from the direction of arrows II-II in FIG.

FIG. 3 is a sectional view similar to FIG. 1, showing the pin press-fitting device in which each contact pin is held by each holding groove of the pin attitude holding member.

FIG. 4 is a cross-sectional view similar to FIG. 1, showing a pin press-fitting device in which each contact pin is press-fitted into each pin hole by each pressing plate.

FIG. 5 is a vertical sectional view showing an oxygen sensor according to a conventional technique.

FIG. 6 is an enlarged vertical sectional view showing the insulating cover and each contact pin in FIG. 5 in an exploded state.

FIG. 7 is a sectional view showing an overall configuration of a pin press-fitting device according to a first conventional technique.

FIG. 8 is a sectional view showing an overall configuration of a pin press-fitting device according to a second conventional technique.

[Explanation of symbols]

 3 Insulation cover (press-fitted member) 4 Pin hole 8 Contact pin (pin) 11 Press mechanism (pressing means) 12 Press stand 13 Press ram (elevating member) 15 Positioning holder (positioning means) 32 Pin posture holding member (Pin posture holding means) ) 33 holding groove 34 pin pushing member (pin pushing means) 35 pushing plate 36 supporting member (supporting means) 40 return spring

Claims (3)

[Claims] 1. A press means comprising an elevating member provided to be able to ascend and descend with respect to a press stand, and a press stand of the press means for positioning a press-fitted member in which a pin is temporarily placed in a pin hole. And a pin attitude holding means that is attached to the elevating member of the pressing means and holds the attitude of the pin temporarily placed on the positioning means when the elevating member descends. A pin press-fitting device comprising a pin pushing means movably provided in the pin posture holding means for press-fitting the pin held by the pin into the pin hole of the press-fitted member. 2. A support means is provided between the pin posture holding means and the pin pushing means for supporting the pin posture holding means so as to be vertically movable with respect to the pin pushing means.
Pin press-fitting device described in. 3. The pin press-fitting device according to claim 2, wherein the support means is provided with a return spring that urges the pin attitude holding means downward to return it to the initial position.