JPH0593726U - Automatic press fitting device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an automatic press-fitting device having a simple structure, easy handling, and high work efficiency. [Structure] A device in which each set of a piece A and a ring B is automatically press-fitted and fitted using a pusher 10 for rolling down and moving (horizontal) between parts. As a drive source for pressing down the pusher 10 and for moving between parts, two cams 7 and 9 which are interlocked via a toothed transmission belt 6 and the like based on one common motor are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for automatically press-fitting parts, for example, two large and small annular objects are fitted to each other.

[0002]

[Prior Art]

 The press-fitting work of each set of multiple parts, such as fitting a seal ring (oil seal) inside the annular bearing material, is not so easy to automate by a machine. This is because it is necessary to push one part (or two or more parts) into the part to be press-fitted (or to the outside) and to move the part accurately to the position of the partner part. is there. However, if the number of parts (number of sets) is large, automation is indispensable to reduce the assembly cost and solve the labor shortage. In recent years, various automatic press-fitting devices have been put to practical use.

Generally, an automatic press-fitting device uses an object called a pusher (or press-fitting rod) for moving and fitting parts. The pusher has the function of moving between parts, that is, the function of holding one of the parts at the tip to move it to the position of the press-fitting partner, and the function of pressing, that is, pressing the held part to push it into the other part. It has two functions, and.

In the conventional automatic press-fitting device, the two functions of the pusher are performed by different actuators (power source devices such as motors), and for example, for moving between parts and for pressing down, respectively. A hydraulic cylinder is provided. Since each function has a completely different operation direction (usually 90 °), an actuator is provided for each direction. This also applies to the case where a general-purpose robot automatically press-fits, and the robot is also equipped with an actuator for moving between parts and an actuator for rolling down independently.

[0005]

[Problems to be solved by the device]

 Since the two operations of the pusher, that is, movement between parts and reduction are performed by separate actuators, the conventional automatic press-fitting device has the following disadvantages.

B) At least two actuators need to be provided, and the structure of the device is complicated.

(B) The pusher needs to be synchronized (matched in timing) with the movement between the parts and the reduction, such as performing a reduction when the pusher moves onto a specific part. However, the conventional automatic press-fitting device is Special means (such as control equipment) are required for synchronization, which further complicates the device configuration.

[0008] c) Due to the above a) and b), the cost of the device is high and the maintenance is not easy (the failure is likely to occur), and the burden on the user is not light.

(D) Regarding the above-mentioned (b), in a device of a system in which the position of movement between parts is detected by sensors and the pusher is pressed down, it takes time to control and it is difficult to improve work efficiency (higher cycle). ..

An object of the present invention is to provide an automatic press-fitting device having a simple structure, easy handling, and high work efficiency.

[0011]

[Means for Solving the Problems]

 The automatic press-fitting device of the present invention is a device for automatically press-fitting each set of a plurality of parts by using a pusher for pressing down and moving between parts, and a drive source for pressing down the pusher and moving between parts. As for two cams that are interlocked via power transmission means (belt, chain, gear or various shaft couplings) based on one common motor (rotary actuator such as electric motor, hydraulic motor, pneumatic motor). Each is deployed.

According to the second aspect of the present invention, the apparatus is provided with the individual feeding means and the feeding means driven by the cams or pushers in order to place the parts to be fitted in a predetermined position. Good.

Further, according to a third aspect of the present invention, a stopper is provided so that a part of the pusher hits and is positioned when moving between the parts, and the stopper is provided between the pusher and the cam for moving between parts. An elastic body (spring, rubber, etc.) that absorbs displacement in the moving direction may be provided.

[0014]

[Action]

 In the automatic press-fitting device of the present invention, the pressing of the pusher and the movement between the parts are driven by one of the above-mentioned cams, respectively, and these two cams are driven by a common motor through a power transmission means. Since they are linked to and interlocked with each other, the above-mentioned two movements of reduction and movement between parts are performed in synchronization. That is, the pusher is mechanically determined by each cam in each of two movements, and the timing of these movements is also mechanically synchronized by the power transmission means.

Compared to the case where a sensor or various control devices are used to define or synchronize each operation, such a mechanical means has a simple structure, so that there are few failures and maintenance is easy, and the operation is easy. Has the advantage of being easy to speed up. Needless to say, the fact that the above two operations can be performed by a single motor is also a great advantage of the device of the present invention.

In the press-fitting device according to a second aspect of the present invention, a predetermined position (each of the above-mentioned parts is a pusher) of a component to be fitted (a component to be held and moved by the pusher or a component to be press-fitted at the destination). The supply to the fixed position, which is supplied to receive the operation, is efficiently performed based on the simple configuration. That is, one of the stocked parts is delivered one by one by the individual delivery means, and the part is further delivered to the predetermined position by the delivery means. In this device, since the feeding means and the feeding means are mechanically moved by the above-mentioned cams or pushers, no special actuator is required for feeding the parts and the pusher can be accurately operated at high speed. It works together while synchronizing.

Further, in the press-fitting device according to the third aspect, even if the cam is worn, for example, the positioning accuracy related to the movement of the pusher between the parts does not decrease. That is, in this device, the pusher that has moved between the parts stops when it partially hits a stopper that is fixed to a predetermined position (a position within the range where the cam moves the pusher). The stop position is determined with high repeatability regardless of cam wear, etc., so that if the stopper is fixed properly, the pusher will always be in the correct position (for example, the tip of the pusher will be on the specified part). It will stop at the position). The displacement (and force) of the cam in the moving direction that tries to push the pusher that hits the stopper is absorbed by the elastic body arranged between the cam and the pusher.

[0018]

【Example】

 1 to 6 show an embodiment of the present invention. The illustrated device is a device for fitting the rubber seal ring B of (b) into the expanded diameter portion Aa of the synthetic resin bearing piece A shown in FIG. 6 (a) by press fitting. Since the ring B needs to be fitted in a so-called interference fit state so as not to fall off from the piece A, this device pushes it into the portion Aa.

The structure of this apparatus is generally as shown in FIG. 1, and a pusher 10 is provided on a support plate 2 on a base plate 1. This pusher 10 is provided with a push rod 11 in the center, and horizontally reciprocates (moves between parts) between the fixed positions P and Q shown in the drawing to which the piece A and the ring B are respectively supplied, based on the moving mechanism 20. And the function of pushing down (rolling down) onto the component at each position P and Q by the rolling-down mechanism 30. Further, the tip portion 11a of the push rod 11 has an outer diameter slightly larger than the inner diameter of the ring B. The pusher 10 first holds the ring B by frictional force on the tip portion 11a by lowering the rod 11 with respect to the ring B at the fixed position Q, and then, by holding the ring B at the fixed position of the piece A adjacent to the ring B 1. It carries the basic work of this device: transporting it to P (moving between parts) and then press-fitting (pressing down) it into the expanded diameter portion A a.

The structure of the pusher 10 itself is as shown in FIG. That is, the push rod 11 is provided so as to be movable up and down with respect to the spherical body 13 incorporated in the pusher block 12 via the slide bush 13b, and the rod 11 has a nut 11b at the upper end portion via a screw. Is attached, and a spring 11c is attached to the lower part. The block 12 including the rod 11 is passed through the plurality of guide rods 14 extending downward from the slide base 16 so as to be vertically movable via the sliding bush 14b, and the lower end of the rod 14 is moved. It is pushed up on the plate 15 by the spring 14a. Therefore, the rod 11 is normally located at the upper position together with the block 12 by the action of the spring 14a, but when the pin 13a of the spherical body 13 is pushed down from above by the pressing mechanism 30 (FIG. 1), the rod 11 descends, and at that time, the tip 11b. At this time, a reduction force acts via the spring 11c (and is therefore equal to the reaction force of the spring 11c). The pressing mechanism 30 is a mechanism in which two links 31 and 32 are connected to the bracket 2b on the support plate 2 as shown in FIG. 1 and is rotatably connected to the pin 13a.

As shown in FIG. 3, the slide base 16 is arranged on the lower surface of the support plate 2 via the slide rail 25 so as to be movable left and right in the figure. Horizontal rods 21, 22 and the like are provided as a moving mechanism 20 for moving the. The horizontal rod 21 is reciprocally passed through a guide 24 (with a sliding bush 24a) fixed to the support plate 2, and the horizontal rod 22 on the opposite side across the base 16 is integrated with the support plate 2. It is passed through the hole of the bracket 26 and is equipped with a spring 22a and is pushed to the left in the drawing. The moving mechanism 20 will be touched later.

Now, in this press-fitting device, the following constitutions 1) to 6) are provided as means for operating the pusher 10 (movement between components and reduction) and supplying components to fixed positions P and Q.

1) Driving Source of Pusher 10: In order to move and push down the pusher 10 between the parts through the moving mechanism 20 and the pressing mechanism 30 as described above, the cam 7 and the cam 9 are shown in FIGS. Was deployed in a linked state. That is, first, the cam 7 is attached to the shaft 7a supported by the frame 3 on the base plate 1, and the tip of the horizontal rod 21 is applied to the surface thereof, while the cam 9 is attached to the shaft 9a supported by the frame 4. The upper end of the link 32 against the front surface. Then, as shown in FIG. 2, the two shafts 7a and 9a are connected to one motor (electric motor) 5 via the toothed transmission belt 6 and the shaft coupling 8, respectively, so that the cam 7 and the cam 9 are in an interlocked state. To do. A rotary roller 21a is provided at the tip of the horizontal rod 21 which comes into contact with the cam 7 as shown in FIG. 1 in order to smooth the operation and suppress wear, and the upper end of the link 32 which comes into contact with one of the cams 9 is also rotated. The roller 32a is attached. Since the rod 21 is pushed by the spring 22a together with the slide base 16 and the like as shown in FIG. 3, the roller 21a (FIG. 1) at the tip does not separate from the surface of the cam 7. Similarly, the action of the spring 14a prevents the roller 32a on the link 32 from separating from the cam 9. As can be seen from FIG. 1, when the cam 7 makes one rotation, the pusher 10 together with the rod 21 (moving mechanism 20) makes one reciprocating movement between the parts, while when the cam 9 makes one rotation, the link 32 (compression mechanism 30). At the same time, the pusher 10 is pressed down and raised only once, but based on the tooth number ratio of the toothed pulleys 6a and 6b on which the belt 6 is wound, the rotational speed of the cam 9 is twice that of the cam 7.

2) Supplying means 40 for the seal ring B: Following a parts feeder (not shown) for feeding all the seal rings B in the same direction, as shown in FIG. It was placed on the top and a stopper 41a was attached to its tip. The position of the ring B that stops by hitting the stopper 41a is the above-mentioned fixed position Q, which corresponds to just below the moving end of the pusher 10 (push rod 11) moving between parts. If a large number of rings B are placed on the rail 41 starting from the fixed position Q, the rings B are supplied to the fixed position Q one after another as they are picked up one by one in the rod 11. Become.

3) Individual feeding means 50 for bearing piece A: In order to feed the bearing pieces A one by one to the fixed position P, first, means for feeding one out of a large number of pieces A, as shown in FIG. As described above, the rotary striker 51, the slide carrier 52, the stock rails 53, and the feeding rails 54 are configured. The striker 51 is provided with two protrusions 51a and 51b, and when the pusher 10 moves to the right, the protrusion 15a is pushed by the pin 15b which is integral with the plate 15 (FIG. 3) of the pusher 10 and rotates together with the striker 51. The protrusion 51b pushes the protrusion 52b of the carrier 52 by the rotational force. The carrier 52 is provided with a main body 52a integrally with a protrusion 52b on a straight guide track (not shown) so that only one piece A can be placed and slid in a direction perpendicular to the rails 53 and 54, and a protrusion 52b is provided by a spring 52c. It is drawn closer to 51b. The rails 53 and 54 have the same inclination as that of the rail 41, but they are connected by sandwiching the main body 52a as shown in the figure, and are displaced laterally by the slide stroke. There is. Such individual feeding means 50 moves the carrier 52 toward the rail 54 via the striker 51 each time the pusher 10 moves to the right in the drawings (FIGS. 1 and 4) during movement between parts, thereby causing the piece A to move. One by one is fed from the rail 53 to the rail 54 and moved to the left side of the drawing, that is, on the carrier 68 of the sending means 60. When the pusher 10 moves to the left, the force of the spring 52c causes the carrier 52 to return to the position near the rail 53, and receives only the next piece A.

4) Feeding means 60 for bearing piece A: The pieces A fed out one by one as described above are placed at a fixed position P on the fixed position Q of the ring B, that is, at the moving end of the pusher 10, at the push rod 11 It is a means to send it to a position directly below. In this means 60, as shown in FIG. 3, a shift block 61, in which a shift arm 63 is extended on a carrier 68, is placed on a linear guide track 62, and this is provided on the horizontal rod 21 as shown in FIG. It is connected to the bracket 65 by a wire 64 that is also hung on a constant pulley 66. A spring 67 is also connected to the block 61 so that this and the wire 64 pull the block 61 in opposite directions. Reference numeral 66a in FIG. 4 is a bracket for mounting the constant pulley 66 on the column 2a of the support plate 2. In this feeding means 60, when the rod 21 moves to the left in FIG. 4 by the rotation of the cam 7, the wire 64 is pulled by the bracket 65 and the block 61 moves forward against the spring 67, whereby the feeding rail is moved. The arm 63 sends out one piece A transferred from 54 to the carrier 68 to a fixed position P. Then, when the rod 21 moves rightward in the drawing together with the pusher 10, the arm 63 together with the block 61 pulled by the spring 67 retracts to a position beyond the tip of the rail 54. A component retainer 69 is attached to the carrier 68 as shown in FIG. 3 in order to press the piece A after the ring B is press-fitted to separate it from the pusher 10 (push rod 11).

5) Positioning means 70 for the bearing piece A: A means for accurately maintaining the position of the piece A sent to the fixed position by the sending means 60, as shown in FIG. 5 (a). The piece A, which has come to the fixed position P, is surrounded by the positioning ring 71 in the same manner as in (b) while the ring B is press-fitted. Mechanically, as shown in (a), the pin 72a is placed at the tip of the swing arm 72 installed on the fulcrum 73 so that the upper surface of the carrier table 68 is at the same level and the fixed position P of the tip end thereof is surrounded. A positioning ring 71 is provided therethrough. When the pusher 10 descends and the projection 12a integral with the block 12 (FIG. 3) presses the rear portion 72b of the arm 72 as shown in FIG. 3B, the tip of the arm 72 rises and the ring 71 is raised. The position of the piece A is determined. When the pusher 10 rises and picks up the ring B at the fixed position Q and then moves it to the fixed position P again, the press-fitted piece A of the ring B is sent out as shown in FIG. The piece A carried by the 60 (arm 63) pushes it out from the fixed position P (the ring 71 is in the lowered state).

6) Measures for improving accuracy of movement of the pusher 10 between parts: The moving mechanism 20 of the pusher 10 is driven by the cam 7 of FIG. 1. However, even if the surface of the cam 7 is worn, the position of the pusher 10 can be adjusted. The following measures have been taken so that the accuracy (that is, the ability to stop exactly above the fixed positions P and Q) does not decrease. That is, first, the stoppers 26a and 26b are fixed to the support plate 2 in accordance with the position of the slide base 16 when the pusher 10 comes on the fixed positions P and Q, as shown in FIG. As a result, the position of the pusher 10 is determined not by the surface (curved surface) of the cam 7 but by the stoppers 26a and 26b thereof. Since these fixed positions are determined within the moving range of the base 16 by the cam 7, the cam 7 pushes the base 16 to the right in the figure via the horizontal rod 21 even after the base 16 hits the stopper 26a. As a matter of fact, a disc spring 21a is provided between the rod 21 and the base 16 so that the force at that time and the displacement of the rod 21 can be absorbed comfortably. Therefore, when pushing the base 16 of the pusher 10 to the right while the rod 21 is in contact with the cam 7, the base 16 first comes into contact with the stopper 26a and stops immediately above the fixed position Q, and thereafter, for a while (the pusher 10). (While pressing down), the spring 21a contracts by that amount, even though the rod 21 is further pushed by the cam 7. On the other hand, since the movement of the base 16 to the left in the figure is based on the reaction force of the spring 22a on the rod 22, the base 16 hits the stopper 26b (just above the fixed position P) without any special treatment. ) Stop without difficulty. In FIG. 3, reference numerals 16 a and 16 b are connecting rods between the base 16 and the rod 21 and between the base 16 and the rod 22, respectively, and reference numeral 21 b is a detent piece of the horizontal rod 21.

In this automatic press-fitting device configured as described above, press-fitting of each set of the bearing piece A and the sealing ring B is performed in the following procedure. The description will be given from the state where the press-fitted piece A of the ring B is in the fixed position P and the unpressurized ring B is in the fixed position Q.

The pusher 10 is moved between the parts to the fixed position Q by the cam 7 and the moving mechanism 20, and is positioned and stopped by the action of the stopper 26a. By the movement of the pusher 10 at this time, the individual feeding means 50 feeds only one piece A and feeds it onto the means 60.

The push rod 11 of the pusher 10 is lowered by the cam 9 and the pressing mechanism 30, and the tip portion 11a is inserted inside the ring B at the fixed position Q.

The rod 11 rises as the cam 9 rotates. At this time, the ring B is attached to the tip portion 11a of the rod 11 and lifted up by the elasticity and frictional force of the rubber. At the same time, the adjacent ring B enters the fixed position Q.

The pusher 10 moves between the parts to the fixed position P, is positioned by the stopper 26b, and stops. During this time, based on the movement of the horizontal rod 21 that moves the pusher 10, the unpressurized piece A fed by is sent out by the means 60 to the localization position P, and the previous piece A (the ring B is press-fitted) is sent out. Pay out. In the meantime, the carrier 52 of the feeding means 50 returns to its original position.

The push rod 11 is lowered by the cam 9 or the like, and the ring B held by the tip portion 11a is press-fitted and fitted into the expanded diameter portion Aa of the piece A. At this time, the piece A is not displaced from the fixed position P by the positioning means 70 which is also moved by the pusher 10. Since the rod 11 is pressed against the piece A and the ring B via the spring 11c mounted on the rod 11, even if there is a problem, the excessive pressing force may damage the piece A or a part of the device. Does not occur.

The cam 9 rotates and the rod 11 rises. Although the attachment force of the ring B 1 to the tip portion 11a is small, the ring B is fitted into the tight piece A by an interference fit, so that when the rod 11 rises, the piece A integrated with the ring B acts as the component retainer 69. Leaves the tip portion 11a and remains at the fixed position P. And then, the procedure from above is repeated.

Although one embodiment has been introduced above, the present invention can be implemented in various modes other than this. Some of them are

As can be easily imagined from the part (in parentheses) described in [Means for Solving the Problems], in addition to the above, the cam of the embodiment is of another type (including a so-called positive-acting cam). It is also possible to replace with. Even with regard to the pusher, if the target part to be held and moved is not an elastic one as in the example, a pusher with a magnet or claw at the tip or some kind of opening / closing mechanism should be used. is there. Further, since it is assumed that various pushers are used as described above, it goes without saying that there are various target parts of the device of the present invention other than those of the embodiment (any material, shape, etc.). Further, if the pusher is moved between the parts while stopping at three or more points and is pressed down at each point (this can be realized by changing the shapes of the two cams), the present invention has three or more points. It can also be configured as a device that fits the above parts into one set. The technical idea of the present invention can be applied not only to press fitting parts into each other but also to punch a part by punching.

[0037]

[Effect of the device]

 The automatic press-fitting device of the present invention mechanically presses the pusher and moves the parts between parts without using sensors or control equipment, using one motor as a power source and using two cams mechanically. Since the movement of the robot is mechanically synchronized by the power transmission means, it has the following effects.

1) Since the configuration is simple, the cost of the device is low, maintenance is easy, and there are few failures.

2) Since it is not necessary to send and receive a control signal, it is easy to increase the work cycle and improve the efficiency.

In addition to the above, the apparatus according to claim 2 can efficiently supply the parts to the predetermined position based on a simple configuration.

Further, in the apparatus according to the third aspect, the positioning accuracy with respect to the movement of the pusher between the parts is high, and the accuracy is not deteriorated even when the cam is worn or the like.

[Submission date] October 1, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

[Industrial applications]

This invention is, for example, two large and small cyclics the fitting together tailor - about automatically performing apparatus press-fitting of the parts the mechanic such

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

The structure of the pusher 10 itself is as shown in FIG. That is, the push rod 11 is provided so as to be movable up and down with respect to the spherical body 13 incorporated in the pusher block 12 via the sliding bush 13b, and the rod 11 has a nut 11b at the upper end portion via a screw. Is attached, and a spring 11c is attached to the lower part. The block 12 including the rod 11 is passed through the plurality of guide rods 14 extending downward from the slide base 16 so as to be vertically movable via the sliding bush 14b, and the lower end of the rod 14 is moved. It is pushed up on the plate 15 by the spring 14a. Thus rod 11 is normally in the action of the spring 14a is with block 12 in the upper position, descends and the pin 13a of the spherical body 13 is pushed down from above by the pressure under mechanism 30 (FIG. 1), then the front end portion 11a Then, a pressing force acts via the spring 11c (and is therefore equal to the reaction force of the spring 11c). As shown in FIG. 1, the pressing mechanism 30 is a mechanism in which two links 31 and 32 are connected to a bracket 2b on the support plate 2 and rotatably connected to the pin 13a.

[Brief description of drawings]

FIG. 1 is an overall front view of an automatic press-fitting device as an embodiment of the present invention.

2 is a plan view of the device of FIG. 1. FIG.

FIG. 3 is a partial front view of the device of FIG. 1 near the pusher.

4 is a partial plan view of the apparatus of FIG. 1 (a view taken along the line XX in FIG. 1).

5 is a partial side view of the apparatus of FIG. 1 (a view taken along the line YY in FIG. 4), where FIG. 5 (a) shows a natural state and FIG. 5 (b) shows an operating state.

6 is a cross-sectional view of the parts handled by the device of FIG.
Each of (a) and (b) shows a bearing piece and a seal ring to be fitted.

[Explanation of symbols]

 5 Motor 6 Toothed Belt (Power Transmission Means) 7.9 Cam 8 Shaft Coupling (Power Transmission Means) 10 Pusher 20 Moving Mechanism 21a Spring (Elastic Body) 26a / 26b Stopper 30 Pressing Mechanism 50 Individual Feeding Means 60 Sending Means

Claims (3)

[Scope of utility model registration request] 1. A device for automatically press-fitting and fitting each set of a plurality of parts by using a pusher for pressing down and moving between parts, wherein one common drive source is used for driving down the pusher and moving between parts. The automatic press-fitting device is provided with two cams that are interlocked with each other via a power transmission means based on the motor. 2. The automatic press-fitting device according to claim 1, further comprising individual feeding means and feeding means driven by the cams or pushers in order to place parts to be fitted in place. 3. A stopper is provided so that a part of the pusher hits and is positioned when the parts are moved, and a stopper is provided between the pusher and the cam for moving the parts.
The automatic press-fitting device according to claim 1 or 2, further comprising an elastic body that absorbs the displacement in the moving direction.