JPH0627303Y2 - Work equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a working apparatus having a plurality of working heads and capable of appropriately adjusting a distance between the working heads.

(Prior Art) For example, in a working device used to assemble a valve spring to a cylinder head, it is necessary to assemble a plurality of valve springs at the same time in order to efficiently perform the assembling work. Due to such requirements, it is customary to allow a plurality of working heads to simultaneously hold and assemble the valve spring.
On the other hand, when different types of cylinder heads are installed, the intervals between the valve spring housings where the valve springs should be installed are different. It will be necessary to adjust the interval appropriately.

In order to deal with the above demands, the actual development is 60-
As disclosed in Japanese Patent No. 165118, a plurality of movable units each having a work head are roller-engaged with a plurality of cam grooves formed on one axis, thereby adjusting the distance between the work heads. What has been made possible has already been proposed.

(Problems to be Solved by the Invention) In the case of the above-mentioned known example, although it can be applied to a work device that requires only the adjustment of the work head distance, it is necessary to adjust not only the work head distance but also the work direction. It is difficult to apply to things.

However, in the case of the working device used for the above-mentioned valve spring assembly, depending on the type of engine, there is a risk of interference with the bearing cap, etc., so it is not possible to assemble the valve spring from the vertical direction. Assembling work may be required with the work head being swung by a predetermined angle. Under such circumstances, it is an important issue to be solved to make it possible to smoothly adjust the distance between the working heads and the working direction of the working heads by a simple means.

The present invention has been made in view of the above points, and an object of the present invention is to make it possible to adjust the distance between a plurality of work heads and the work direction by using an extremely simple means.

(Means for Solving the Problems) In the present invention, as means for solving the above problems, a plurality of base units movably supported with respect to a guide frame and a moving direction interval between these base units are adjusted. And a work head pivotally supported on each base unit so as to be swingable with respect to each of the base units, the work device being provided corresponding to each of the base units. A single drive shaft supported in parallel with the moving direction of the base unit with respect to the guide frame is supported so as to be rotatable synchronously and relatively movable in the axial direction, and has a cam surface on the axial end face in the same direction. A plurality of cam members, driving means for rotating the drive shaft, and cam surfaces of the respective cam members, which are provided on the respective working heads. And an engaging member for holding each work head in a predetermined swing posture by engaging with each other, and between the respective cam members and the respective base units as the base unit moves in the pitch changing direction. Interlocking means for moving each cam member along the drive shaft and permitting rotation of the cam member when the drive shaft rotates.

(Operation) In the present invention, the following operations can be obtained by the above means.

That is, a single drive shaft is rotationally driven by the drive means to rotate the cam member provided on each base unit, whereby the cam surface of the cam member and the engagement member provided on each work head are separated. Each work head is held in a predetermined swing posture by the engagement, but since the cam member can be moved along the drive shaft along with the movement of the base unit in the pitch changing direction, the pitch changing means is used. The space between the base units can be easily and smoothly adjusted. That is, it is possible to maintain the posture of each work head in a predetermined swing posture by a single drive shaft regardless of the pitch change of each base unit.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

The working apparatus A of the present embodiment is used when simultaneously assembling a plurality of valve springs 3, 3 ... In the valve spring housings 2, 2 ... of the cylinder head 1 of four cylinders (see FIG. 1). ). In the cylinder head 1 to which the valve springs 3, 3, ... Are assembled by the working device of the present embodiment, the bearing caps 4 are provided at the positions adjacent to and above the respective valve spring accommodating portions 2 and The structure is such that it is difficult to assemble the valve spring 3 from the vertical direction. Reference numeral 5 is a valve stem.

As shown in FIG. 4, in the working device A, the workstock station S ₁ in which the valve springs 3, 3, ... Are prepared by the robot B and the cylinder head 1 carried in by the conveyor 7 are positioned and the valve spring It is configured to be able to reciprocate between the assembling station S ₂ and the assembling stations 3, 3.

As shown in FIGS. 1 to 3, the working device A includes four base units 9, 9, ... Slidably installed on guide rails 8, 8 provided on the guide frame 6.
Working heads 11, 11 ... that are swingably supported on the respective base units 9, 9.
It has and.

The base units 9, 9, ... Can be adjusted in their moving direction intervals by the pitch changing means 12.
The pitch changing means 12 is located between the base units 9, 9, ..., One end side of which is fixed to one base unit 9 and the other end side of which is movable back and forth with respect to the other base unit 9. , 13 and the base unit 9,
Spacers 14, 14, 14 that are located between each other and that determine the minimum pitch P ₁ of adjacent base units 9, 9 and the base unit 9, 9 And a horizontal cylinder 15 for Reference numeral 16 is a connecting member 13 in the base unit 9.
Is a stopper for regulating the movement amount of the. That is,
In this embodiment, the extension or contraction of the horizontal cylinder 15 causes the base units 9, 9 ...
The pitch can be changed to the minimum pitch P ₁ restricted by the distances 4, 14, ₁₄ or the maximum pitch P ₂ restricted by the engagement of the connecting members 13, 13, ... And the stoppers 16, 16, 16. (See Fig. 2). By changing the pitch of the base units 9, 9 ... In this way, it is possible to assemble the valve springs into the two types of cylinder heads 1 having different intervals between the valve spring accommodating portions 2, 2.

The work head 11 includes a base 17 pivotally attached to the swing shaft 10, a lift cylinder 19 attached to a bracket 18 provided on the base 17, and a lift cylinder 19. Chuck cylinder 20 provided at the lower end of the piston rod 19a of
It is composed of a pair of clamp claws 21 and 21 that can be opened and closed by means of (see FIG. 3). With this work head 11,
The valve spring 3 is clamped or unclamped from the inner diameter side by the opening / closing operation of the clamp claws 21, 21 by the chuck cylinder 20, and the valve spring 3 is picked up by the expansion / contraction operation of the elevating cylinder 19 and to the valve spring housing 2 in the cylinder head 1. The valve spring 3 is assembled.

Further, the base units 9, 9 ... Corresponding to the respective base units 9, 9 ,.
On the other hand, cam members 24, 24, ... Pivotally rotatably supported on a single drive shaft 22 supported in parallel with the moving direction of the base units 9, 9 ,. The respective cam members 24 have the same direction (in the case of this embodiment, as shown in FIG.
(The right side in FIG. 2), the first and the second described later on the axial end surface.
It has cam surfaces 25a and 25b, is co-rotatable with the drive shaft 22, and is relatively movable in the axial direction.

The cam member 24 and the base unit 9 are moved along with the pitch changing direction of the base unit 9 via the connecting pins 26, 26 engaging with the annular groove 32 formed on the outer periphery of each cam member 24. A cam member 24 is movably connected to the drive shaft 22. The drive shaft 22
When the cam member 24 rotates in accordance with the rotational driving of the connecting member 26, the connecting pins 26, 26 are guided by the annular groove 32, and the cam member 24 is allowed to rotate. That is, in the case of the present embodiment, the cam pins 24 are moved along the drive shaft 22 with the movement of the base unit 9 in the pitch changing direction by the connecting pins 26, 26 and the annular groove 32, and the drive shaft is rotated. In the above, the linkage means for allowing the rotation of the cam member 24 is configured.

A pin-shaped engaging member 27 protruding from the base 17 of the working head 11 is engaged with the first and second cam surfaces 25a, 25b of the cam member 24.
The first and second cam surfaces 25a, 25b and the engaging member 2
The engagement with 7 is maintained by the urging force of a spring 28 provided between the base 17 of the work head 11 and the base unit 9. Then, the first
In the state where the engagement member 27 is engaged with the cam surface 25a, the work head 11 is in the vertical posture, and when the engagement member 27 is engaged with the second cam surface 25b, the work is performed. The head 11 is adapted to have a swing posture inclining by a predetermined angle. And the drive shaft 2
By the rotation of the cam member 24 accompanying the rotation of 2, the engaging member 27 on the side of the work head 11 is moved to the first cam surface 25a or the second
By engaging with the cam surface 25b, the working head 1
1 can be a vertical posture or a swing posture.

The drive shaft 22 is connected via a gear mechanism 29 to a rotary shaft 23a of a reversible motor that functions as a drive means 23. Reference numeral 30 is a bearing, and 31 is a sensor for detecting the rotation angle of the drive shaft 22.

Next, a procedure for assembling the valve spring using the illustrated working device will be described.

First, the engagement member 27 and the cam member 24 of each work head 11
Engages with the first cam surface 25a of the
The valve spring 3 is picked up at the work stock station S ₁ without the vertical posture as shown by the chain line. Then, the working device A is moved to the assembly station S ₂ , and the reversible motor 23 is driven to rotate the cam member 24 by a predetermined rotation angle. Then, the first of the cam member 24
The engaging member 27 that is engaged with the cam surface 25a is the second
As it is engaged with the cam surface 25b (shown by the solid line in FIG. 1), the working head 11 is in a swing posture inclined by a predetermined angle about the swing shaft 10 as shown by the solid line in FIG. While maintaining this posture, the clamp claws 21, 2 are extended by the extension operation of the lifting cylinder 19 of each work head 11.
The valve springs 3 clamped at 1 are assembled in the valve spring housing portions 3 of the cylinder head 1. After the assembling, the clamp claws 21, 21 are brought into an unclamped state, and the work head 11 is returned by the contraction operation of the elevating cylinder 19. As described above, by assembling the valve springs with the respective working heads 11 in the swing posture, the bearing caps are provided at a position adjacent to the upper side of the valve spring accommodating portion 3 like the cylinder head 1 in this embodiment. Therefore, it is possible to easily adapt to the case where it is difficult to assemble the valve spring in the vertical direction.

When the type of the cylinder head 1 to which the valve spring 3 is to be mounted is changed, the pitch changing means 12 operates to change the pitch between the base units 9, 9 ,. Also at this time, the cam member 24, which is linked to each base unit 9 while being allowed to rotate, and the drive shaft 22 for rotating the cam member 24 are relatively movable in the axial direction. The posture of each work head 11 can be easily changed by the single drive shaft 22 regardless of the pitch change of each base unit 9.

In the above description, the working device used for assembling the valve springs to the cylinder head is taken as an example, but the working device of the present invention can change the pitch of a plurality of working heads even if the work is other than assembling the valve springs. Needless to say, the present invention can be applied to those requiring a change in the posture of each work head.

Further, the present invention is not limited to the configuration of the above-described embodiment, and it goes without saying that the design can be appropriately changed without departing from the scope of the invention.

(Advantages of the Invention) As described above, according to the present invention, a plurality of base units movably supported with respect to the guide frame, pitch changing means for adjusting the moving direction intervals of these base units, and In a working device including a work head pivotally supported by a swing shaft for each base unit, the working device is provided corresponding to each of the base units, and the base is provided with respect to the guide frame. A plurality of cam members that are synchronously rotatable on a single drive shaft that is supported in parallel with the moving direction of the unit, and that are relatively movable in the axial direction, and that each have a cam surface on the axial end face in the same direction; , Driving means for rotating the drive shaft, and the respective work heads provided on the respective work heads. An engaging member that holds the posture in a swing posture is additionally provided, and each cam member is provided along the drive shaft between each cam member and each base unit as the pitch changing direction of each base unit moves. Since the linkage means for moving and allowing the rotation of the cam member when the drive shaft is rotated is provided, each working head is swung by a single drive shaft regardless of the pitch change of each base unit. It is possible to hold the posture, and there is a practical effect that the interval adjustment of the plurality of work heads and the work direction adjustment can be surely and smoothly performed by an extremely simple means.

Further, a linking unit that moves each base unit and each cam member along the drive shaft in accordance with the movement of each base unit in the pitch changing direction and allows the cam member to rotate when the drive shaft rotates. Since the base unit and the posture of the work head due to the rotation of the cam member can be independently changed, the workability can be greatly improved. .

[Brief description of drawings]

FIG. 1 is a front view in which a part of a working device according to an embodiment of the present invention is shown in section, FIG. 2 is a plan view of the working device shown in FIG. 1, and FIG. 3 is a working device III shown in FIG. -III sectional view, FIG. 4 is a plan view showing an outline of a working apparatus according to an embodiment of the present invention. 6 ... Guide frame 9 ... Base unit 10 ... Oscillating shaft 11 ... Working head 12 ... Pitch changing means 22 ... Drive shaft 23 ... Driving means (reversible motor) 24 ... Cam members 25a, 25b ... ... Cam surface 26 ... Connecting pin 27 ... Engaging member 32 ... annular groove

Claims (1)

[Scope of utility model registration request] 1. A plurality of base units movably supported with respect to a guide frame, pitch changing means for adjusting a distance between the base units in a moving direction, and a swing shaft for each of the base units. And a work head pivotally supported so as to be swingable, the work device being provided so as to correspond to each of the base units, and supported in parallel with a moving direction of the base unit with respect to the guide frame. A plurality of cam members which are synchronously rotatable on a single drive shaft and are relatively movable in the axial direction, and each of which has a cam surface on an axial end face in the same direction, and a drive for rotationally driving the drive shaft. Means for engaging each of the work heads with a cam surface of each of the cam members to hold each work head in a predetermined swing posture. A member is additionally provided, and between each cam member and each base unit, each cam member is moved along the drive shaft as the pitch change direction of each base unit moves, and A working device characterized in that a linkage means is provided for allowing rotation of the cam member during rotation.