JPH0616960B2 - Pressure transmission element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is incorporated into a press or the like to manage and control a pressurizing load within an appropriate range in a fitting process of a precision component, a press-fitting process, and the like to apply a pressing force. The present invention relates to a pressure transmission element that accurately transmits the pressure in the axial direction.

<Prior Art> Conventionally, fitting of a turntable of a compact disc player, which is a precision component, and a motor shaft has been performed as follows using a press-fitting device as shown in FIG.
That is, the work support jig 62 is fixed to the work table 61b of the press 61, and the turntable 63 is attached to the motor shaft 64.
The motor 64 loosely fitted to a has its axis centered on the press 61.
Of the pressure head 61a is supported by the chassis 65 of the work supporting jig so as to be aligned with the central axis of the pressure head 61a.
Is lowered and the turntable 63 is pushed into the motor shaft 64a for tight fitting.

<Problems to be Solved by the Invention> However, the above-described conventional press-fitting device cannot adjust the press-fitting load within an appropriate range according to the machining conditions of the workpiece, and further, does not measure the press-fitting load at the same time as the press-fitting. ,
It is difficult to obtain the optimum fitting only by the skill of a skilled worker. If the press-fitting load is less than the lower limit value, the fitting is too loose, causing the turntable 63 to idle when used, and the press-fitting load value becomes the upper limit value. If it is above, the fitting is too tight and the motor shaft 64
There is a drawback in that the curve or inclination of a causes the surface wobbling or the center wobbling of the compact disc during use, and the performance of the player is significantly impaired. Further, as shown in FIG. 7 (b), the turntable 63 and the motor shaft 64a, which require a micrometer-order fitting accuracy, have their respective axes aligned with the central axis A of the pressure head 61a during press fitting. It is desirable that they match perfectly, and the allowable range of the angle of deviation of the shaft center is required to be within 0.01 ° from the viewpoint of assembly accuracy. However, the actual deviation angle θ reaches several tens of times the above allowable value due to the influence of rattling at the time of ascending and descending due to the unevenness of the sliding contact surface 61b of the pressure head 61a, and the motor shaft 64a at the time of press fitting. There is a drawback that bending and inclination occur at the same time, which similarly causes surface wobbling during use. In other words, no matter how the shaft diameter of the motor 64 and the press-fitting hole diameter of the turntable 63 are machined within the fitting accuracy, the compact disc player as a product will be defective due to the above-mentioned drawbacks. Further, there is a drawback that the load cell, which is the load detecting means of the press-fitting device, is expensive.

Therefore, an object of the present invention is to be incorporated in a pressurizing machine or the like with a simple and inexpensive structure, accurately transmit in the axial direction while controlling and controlling the pressing force within an arbitrary appropriate range, and at the same time outside the above-mentioned appropriate range. In the case of, it is possible to issue an alarm, press fit,
It is an object of the present invention to provide a pressure transmission element that can be effectively and widely applied to inspection and weighing processes.

<Means for Solving the Problems> In order to achieve the above object, in the pressure transmission element of the present invention, a spring support ring is screwed onto one end of the cylinder body so as to be able to advance and retract in the axial direction, while the endurance end of the cylinder body is A cylinder having a reference plate having a hole fixed thereto, an insulating sleeve attached to the hole of the reference plate and having a brim-shaped contact ring fixed to the outer end, and a piston portion arranged inside the cylinder. , A spring compressed between the piston part and the spring support ring, and a slidably inserted into the insulating sleeve while being connected to the piston part and having a flange-shaped stopper and a universal ball at the tip. It has a rod part.

<Operation> A spring support ring at one end of the cylinder body is connected to, for example, a working head of a press, and a tip of a rod portion slidably inserted into an insulating sleeve attached to the center of a reference plate at the other end of the cylinder body. The universal ball is brought into contact with the work to be fitted. Then, when the pressure head is lowered toward the work, the pressure force of the pressure head is transmitted to the rod portion through the spring support ring of the cylinder, the compressed spring, and the piston portion, and through the universal ball at the tip. And press the work. When the pressing force is gradually increased and becomes equal to or higher than the spring force (lower limit pressing force) of the compressed spring, the spring is compressed by the piston portion and the piston portion separates from the reference plate. When the pressing force further increases and reaches the upper limit pressing force, the flange-shaped stopper at the tip of the rod portion that is recessed in the cylinder comes into contact with the contact ring on the reference plate surface as the spring shortens. Therefore, if the contact / separation between the reference plate and the piston portion and the contact / separation between the contact ring and the stopper are taken out as, for example, electrical ON / OFF signals, an alarm is issued when the pressure is below the lower limit pressure or above the upper limit pressure. Further, the lower limit and the upper limit pressure can be adjusted by advancing and retracting the spring support ring in the axial direction to increase or decrease the spring force and expanding and contracting the rod portion. Further, since the pressing force is applied to the work through the universal ball, even if the shaft center of the pressing head and the shaft center of the work are not aligned with each other, the oblique press force does not act on the work.

<Examples> Hereinafter, the present invention will be described in detail with reference to illustrated examples.

1 and 2 are a longitudinal sectional view and an exploded perspective view showing an embodiment of the pressure transmitting element of the present invention. This pressure transmission element 2
Has a cup-shaped spring support ring 22 having a mounting screw 22a for the pressure head 1a (see FIG. 4) screwed onto the upper end of the cylinder body 21 so as to be able to advance and retract in the axial direction, while the lower end of the cylinder body 21 is Reference plate 23 having a circular hole 23a in the center
The insulating sleeve 24a, the collar-shaped insulating washer 24b, and the contact ring 2 are screwed into the central circular hole 23a of the reference plate.
A bearing cylinder 24 formed by integrating 4c is fitted in and fixed to the bearing cylinder 24, and a flange-shaped upper limit stopper 26 having a universal ball 25 from below, an upper limit sleeve 27 as a rod portion, an upper limit adjusting screw 28, A piston 30 formed by sequentially screwing or engaging a cup-shaped spring support sleeve 29 that contacts the inner surface of the reference plate 23 is slidably fitted in the axial direction, and further, the spring support ring 2
The coil spring 31 is contracted between the spring 2 and the spring support sleeve 29.

Then, as shown in FIGS. 1 and 3 (a), the piston 30 abutting against the work 8 through the universal ball 25 and the press-fitting head 4 (see FIG. 4) has a descending pressure head 1a ( (See FIG. 4), a pressing force is applied via the spring support ring 22 fixed thereto and the coil spring 31, and this pressing force becomes larger than the spring force of the coil spring 31 that is compressed, that is, the lower limit pressing force. , Coil spring 31
Contracts in the X direction, and the spring support sleeve 29 separates from the inner surface of the reference plate 23 as shown in FIG. 3 (b). Also,
When the coil spring 31 further contracts in the direction of the arrow X and the pressing force reaches the upper limit pressing force, before the upper limit adjusting screw 28 contacts the spring support ring 22, as shown in FIG. Comes into contact with the contact ring 24c of the bearing cylinder 24, and the pressure applied from the pressure head 1a is directly transmitted to the upper limit stopper 26 via the reference plate 23 of the cylinder body 21.
The spring force of the coil spring 31, that is, the lower limit pressure can be increased or decreased by advancing and retracting the spring support ring 22 in the axial direction, and the upper limit pressure can be increased by the upper limit sleeve 27 (see FIG. 1) engaged with the spring support sleeve 29. ), The upper limit sleeve 27 is projected and retracted in the axial direction, and the stroke S (see FIG. 3 (a)) can be changed to increase or decrease. A lock screw 32 is screwed onto the tip of the upper limit adjusting screw 28 of the piston 30, and the upper limit stopper 26 is constantly pressed by the lock screw 32 via a steel ball 33, whereby the upper limit stopper 26 is axially moved. In addition, the pressing force received by the spring support sleeve 29 is accurately transmitted to the center in the axial direction.

On the other hand, in the alarm device 10 shown in the circuit diagram of FIG. 1, the (+) side of the power source 34 in which the (−) side is connected to the point a of the upper limit stopper 26 is connected to the series resistor 35, the LED 36 and The cylinder body 21 is connected via a buzzer 37 that is in parallel with this.
Connected to the point b of, and the series resistor 38 and LED3
9 and a contact ring 24c of the bearing tube 24 insulated from the cylinder body 21 via a buzzer 40 arranged in parallel therewith
The cylinder body 21, the reference plate 23, and the piston 30 are made of a metal material that is a conductor. When the pressure applied from the pressure head 1a (see FIG. 4) is less than the lower limit pressure, the point b of the cylinder body 21 and the point a of the upper limit stopper 26 cause the reference plate 23 and the spring support sleeve 29 to contact each other. When it is conducted via the LED 36, the LED 36 lights up and the buzzer 37 sounds to notify that the applied pressure is too small. The applied pressure exceeds the upper limit applied pressure, and the contact ring 24c c
When the point and the point a of the upper limit stopper 26 come into contact and become conductive, L
The ED 39 lights up and the buzzer 40 sounds to notify that the applied pressure is excessive.

The operation when the work is press-fitted by incorporating the pressure transmission element having the above-mentioned configuration into the press will be described below with reference to FIG.

The press 1 is an improvement of the conventional press 61 described in FIG. 6, in which the pressure transmitting element 2 is connected to the tip of the pressure head 1a similar to the conventional press, and the upper limit stopper at the lower end of this pressure transmitting element is connected. The connecting metal fitting 3 having a U-shaped cross section having a notch 3a is connected to 26, and the press-fitting head 4 is inserted into the notch 3a.
The press-fitting head 4 is inserted into the through hole 6a of the support arm 6 projecting from the work supporting jig 5 fixed on the work table 1b of the press while engaging the flange 4a at the upper end of the press head 1a. , Which is coaxial with the central axis A of the pressure transmission element 2 and slidably supported vertically. Further, the spring force of the coil spring 31 of the pressure transmission element 2 is exerted between the cylinder body 21 and the piston 30 by moving the spring support ring 22 (see FIG. 1) in the axial direction, and a lower limit of 8 kg, for example, is applied. The coil spring 31 contracts in the direction of the arrow X under pressure to adjust the spring support sleeve 29 away from the reference plate 23, while the protrusion amount S of the upper limit sleeve 27 is
By turning the upper limit adjusting screw 28, the cylinder body 2
It is adjusted so that the coil spring 31 contracts most and the upper limit stopper 26 comes into contact with the contact ring 24c of the bearing cylinder 24 under the upper limit pressure of 15 kg which acts between the pistons 30.

Now, on the work supporting jig 5 fixed to the press 1, the work in which the press-fitting hole of the turntable 8 is loosely fitted to the motor shaft 7a of the motor 7 is arranged so that their central axes coincide with the vertical line A. And is held and fixed by the chassis 9. Next, the press 1 is driven to lower the pressure head 1a, and the work is pressed toward the work table 1b via the pressure transmission element 2, the universal joint 3 and the press-fitting head 4.

At this time, the pressure of the pressure head 1a is 8 kg (lower limit pressure)
If less, b of the cylinder body 21 as shown in FIG.
The point and the point a of the upper limit stopper 26 are electrically connected to each other via the reference plate 23 and the spring support sleeve 29 that are in contact with each other, and the LED 3
Since 6 lights up and the buzzer 37 sounds, when the works 8 and 7a are press-fitted in such a state, the press-fitting is too small and the worktable is loosely fitted, causing the turntable 8 to idle when used. I can judge. If the pressure of the pressure head 1a exceeds 15 kg (upper limit pressure), the bearing tube 24
Since the point c of the contact ring 24c and the point a of the upper limit stopper 26 are brought into contact with each other, the LED 39 lights up and the buzzer 40 sounds, when the work 8 or 7a is press-fitted in such a state, press-fitting is performed. Is too large, the work is tightly fitted, the motor shaft 7a is bent, etc., and it can be determined that the surface wobbling of the disk or the like is caused during use. Needless to say, the above lower and upper limits can be adjusted freely. Further, the pressing force from the pressure head 1a is applied to the lock screw 3 in the pressure transmission element 2.
2. It is accurately transmitted to the axial center of the upper limit stopper 26 via the steel ball 33 without rattling, and further accurately transmitted to the axial center of the press-fitting head 4 via the universal ball 25. That is, in this embodiment, the universal ball 25 at the lower end of the upper limit stopper 26 always transmits the pressing force straightly on the vertical line A to the works 8 and 7a.
Since the oblique pressure input unlike the conventional example does not occur at all, it is possible to accurately manage and control the lower and upper limits of the pressure by the pressure transmitting element 2.

In the above-described embodiment, the work 8, 7a is mechanically separated from the press head 1a of the press 1 which has rattling associated with lifting and lowering mechanical accuracy and is vertically held by the support arm 6 through the press-fit head 4. Since the press-fitting head 4 operates smoothly, the press-fitting head 4 operates smoothly,
The lower and upper pressures can be accurately controlled and controlled by
There is an advantage that outflow of defective press-fitting can be eliminated. Further, the spring support ring 22 of the pressure transmission element 2 is advanced and retracted in the axial direction to increase or decrease the spring force of the coil spring 31 so that the lower limit pressure can be adjusted, and the reference plate 2 of the cylinder body 21 is adjusted.
3 and the spring support sleeve 29 of the piston 30 constitute a lower limit pressure detection means, while the upper limit sleeve 27 is rotated to retract the upper limit sleeve 27 in the axial direction so that the upper limit pressure can be adjusted. Since the contact between the contact ring 24c of the bearing tube 24 of the main body 21 and the upper limit stopper 26 of the piston 30 constitutes the upper limit pressure detection means, the pressure input can be controlled within the range of the lower limit and the upper limit pressure set arbitrarily. There is an advantage that it is possible to immediately know whether the pressure input is excessively small or excessive by the alarm means during the press-fitting work, and it is possible to eliminate the defective press-fitting. In addition, the pressure transmission element 2 of the present embodiment
Is advantageous in that the press-fitting load can be known at the same time as the press-fitting as compared with the conventional load cell, press-fitting device, etc., and the structure is simple and the manufacturing cost is 1/10 or less.

FIG. 5 shows an example in which the pressure transmitting element having the above-mentioned configuration is applied to the inspection work of office equipment. In this example, the pressure transmission element 2 is attached to the robot hand 51 of the industrial robot 50, and the key press inspection of the desktop computer 52 is performed with the universal ball (25) at the lower end of the piston (30) of the pressure transmission element. There is. The spring force of the coil spring 31 (see FIG. 1) of the pressure transmitting element 2 and the protrusion amount S of the upper limit sleeve 27 are appropriately set according to the structure of the key in the same manner as described above, and the key is pushed down below the lower limit pressing force. Alternatively, if the key is not pushed down even when the pressure exceeds the upper limit, it can be determined that the product is defective. As described above, according to the pressure transmission element of the present invention, it is possible to completely automate the key press inspection and the like, which conventionally depended on the experience and intuition of a skilled worker. Further, if the pressure transmitting element 2 is turned upside down and the weighing dish is attached to the tip of the piston 30 while the cylinder body 21 is fixed, the upper limit and the lower limit of the weight can be detected and an alarm can be issued. Weighing and sorting of products and agricultural products by weight can be realized by inexpensive means.

Needless to say, the present invention is not limited to the above-described embodiments and can be applied to various fields.

<Effects of the Invention> As is apparent from the above description, in the pressure transmission element of the present invention, the reference plate is fixed to the other end of the cylinder in which the spring support ring is screwed so as to advance and retreat in the axial direction. The insulating sleeve having a brim-shaped contact ring is attached to the hole of the plate, while the spring is compressed between the piston portion arranged in the cylinder and the spring support ring, and the rod portion is slidably inserted into the insulating sleeve. While the base end of is connected to the piston part, a flange-shaped stopper and a universal ball are provided at the tip of the rod part, so that the piston part moves relative to the cylinder under a desired lower limit pressure. If the stopper is adjusted so that the stopper abuts against the spring against the spring under the desired upper limit pressure, the piston part is separated from the cylinder. Also, the pressing force transmitted via the spring by the contact of the stopper with the cylinder can be appropriately managed and controlled to be above the lower limit pressing force and below the upper limit pressing force, and
With the above universal ball, it is possible to always apply a straight vertical force input to a workpiece etc., and with a simple and inexpensive structure, it is possible to transmit an appropriate range of pressing force while maintaining verticality, and press-fitting precision parts. The efficiency of work, press inspection, weighing work, etc. can be significantly improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a pressure transmission element of the present invention, FIG. 2 is an exploded perspective view of the above embodiment, FIG. 3 is a vertical sectional view showing the operation of the above embodiment, and FIG. Is a side view showing press-fitting work by a press incorporating the above-mentioned pressure transmitting element,
FIG. 6 is a perspective view showing a key press inspection by the pressure transmitting element, FIG. 6 is a view showing a conventional work press-fitting device, and FIG. 7 is a view showing a press-fitting state according to the conventional example. 2 ... Pressure transmitting element, 21 ... Cylinder body, 22 ... Spring support ring, 23 ... Reference plate, 23a ... Central circular hole, 24 ... Bearing tube, 24a ... Insulating sleeve, 24b ... Insulating washer , 24c ... contact ring, 25 ... universal ball, 26 ... upper limit stopper, 27 ... upper limit sleeve, 28 ... upper limit adjusting screw, 29 ... spring support sleeve, 30 ... piston, 31 ... coil spring.

Claims (1)

[Claims] 1. A cylinder in which a spring support ring is screwed onto one end of a cylinder body so as to be able to advance and retreat in the axial direction, and a reference plate having a hole is fixed to the other end of the cylinder body; An insulating sleeve attached to the hole and having a brim-shaped contact ring fixed to the outer end, a piston portion disposed inside the cylinder, and a spring compressed between the piston portion and the spring support ring, A pressure transmission element comprising a rod portion which is connected to the piston portion and is slidably inserted into the insulating sleeve, and has a flange-shaped stopper and a universal ball at the tip.