# Patent

## Title
Assembly device for assembling camshafts

## Abstract

A diagonal insertion apparatus of this invention inserts a shaft-like member into an insertion receiving component provided with a diagonal hole inclined with respect to a ground or horizontal plane and comprises a holding table or pallet for holding the insertion receiving component, an inclined positioning jig having a plurality of pins of different lengths to engage recess receivers in the bottom of the holding table and elevate and incline the holding table at a predetermined angular relationship to permit properly aligned insertion of the shaft-like member into the insertion receiving component.

## Background
This application is related to the subject matter set forth in copending application Ser. No. 07/520,514 filed May 8, 1990 and entitled "Diagonal Insertion Apparatus" in the name of T. Maruyama and assigned to the same assignee herein.

This invention relates generally to a structure of diagonal insertion apparatus used in the assembly of equipment and more particulary to diagonal insertion apparatus for the insertion of shaft-like members into holes of insertion receiving components in the process of assembling equipment.

In particular, this invention facilitates the easy alignment and insertion of shaft-like members into diagonal holes of components of equipment being assembled as accomplished with diagonal insertion apparatus used in the assembly process. The diagonal insertion apparatus of this invention has particular relevance in the assembly of equipment in the form of wire dot print heads. The equipment component in the process of being assembled is a print head wire guide and is supported on a holding table or pallet and has one or more diagonally aligned holes for receiving a shaft-like member, e.g., a dot print head dot wire, inserted therein by an actuator of the diagonal insertion apparatus. The holding table is aligned beneath the diagonal insertion apparatus and is elevated as well as inclined at an appropriate angle relative to a horizontal plane by a plurality of vertically extending pins having different lengths supported on a mounting plate which is aligned beneath the holding plate. Thus, the mounting plate is elevated from below the holding table to impose a predetermined tilting alignment to the holding table so that the center line of a diagonal hole is aligned with the axis of a shaft-like member held by the diagonal insertion apparatus for insertion into the diagonal hole.

Examples of such diagonal insertion apparatus of the prior art employed in the assembly of equipment are disclosed in FIGS. 5 and 6 wherein equipment component 16 is provided with a diagonal hole 16A inclined at an angle with respect to the horizontal plane and shaft-like member 15, held in a chuck 14 is inserted into hole 16A by means of actuator 13. As shown in FIGS. 5, actuator 13 is inclined by means of an inclined support stand 17 or, as shown in FIG. 6, actuator 13 is inclined by means of an adjustable mechanism 17A to axially align shaft-like member 15 relative to hole 16A.

However, in connection with the first configuration shown in FIG. 5, the mechanism employed to perform insertion, i.e., actuator 13, was constructed to be at the desired inclined angle for proper alignment of member 15 for insertion into hole 16A but the performed inclined angle for actuator 13 is not easily achieved because of lack machining accuracy of inclined surfaces determining the precise angle of required inclination. Furthermore, in the case of the second configuration shown in FIG. 6, the inability to see the inside of the diagonal hole made precision axial aligning adjustment extremely difficult, even in the case where a fine adjustment mechanism for positioning mechanism 17A was included with the apparatus.

Further, from the aspect of continual supply of the shaft-like members 15 for insertion into holes 16A, when the receiving components must be moved horizontally or rotated relative to their axis, the mechanism employed to move these components for alignment in a direction relative to the X, Y, Z and .theta. axes and incline them has little space for maneuverability resulting in the design of a complicated mechanism rendering continuous alignment accuracy difficult.

In addition, whenever the model or type of member 16 to receive inserted members 15 is changed and the angle of diagonal hole 16A is correspondingly changed, the angle of inclined stand 17 must also be readjusted or changed.

It is an object of the present invention to solve the foregoing described problems.

It is further object of this invention to offer a diagonal insertion apparatus that provides for the easy insertion shaft-like members into diagonal holes of components in an assembly line type environment by providing for easy axial alignment of the component holes relative to the shaft-like members.

According to this invention, the diagonal insertion apparatus of this invention inserts a shaft-like member into an insertion receiving component provided with a diagonal hole inclined with respect to a ground or horizontal plane and comprises a holding table or pallet for holding the insertion receiving component, and inclined positioning jig having a plurality of pins of different lengths to engage recess receivers in the bottom of the holding table and elevate and incline the holding table at a predetermined angular relationship to permit properly aligned insertion of the shaft-like member into the insertion receiving component.

In particular, the diagonal insertion apparatus provides means for inserting shaft-like members into insertion receiving components containing a plurality of diagonally aligned holes wherein an inclined positioning jig containing, for example, three pins of different heights or lengths is employed beneath a holding table or pallet supporting the insertion receiving component. The pin containing jig is elevated to, in turn, engage the bottom of the holding table via the ends of the three pins and elevate and incline the holding table so that axial alignment of the component hole relative to the shaft-like member is accurately achieved. Therefore, compared to diagonal insertion apparatus of the prior art which had to perform positioning in the four axial directions relative the X, Y, Z and .theta. axes, positioning of the component diagonal hole relative to axial alignment with the shaft-like member is simplified because angular relationships which are difficult to achieve, due to precise multidirectional adjustment, are replaced with the use of vertical pin lengths on the jig wherein the lengths of pins provide for easily and automatic aligned positioning of the hole containing component.

Other objects and attainments together with a fuller understanding of the invention will become apparent and appreciated by referring to the following description and claims taken in conjunction with the accompanying drawings.

FIG. 1 is an isometric view of a diagonal insertion apparatus comprising this present invention illustrated in a standby condition prior to insertion of a shaft-like member into an insertion receiving component.

FIG. 2 is an isometric view of the diagonal insertion apparatus of FIG. 1 illustrating the completion of positioning of the elevation and angular alignment of the insertion receiving component for proper alignment and reception of a shaft-like member.

FIG. 3 is a cross section configuration showing the angular relationship between the inclined positioning jig and the component holding table of FIG. 2.

FIG. 4 is a detailed cross section showing the relationship of the jig pins provided with rounded ends and their corresponding pin cone shaped receivers to bring about a precise centering action of the holding table.

FIG. 5 is a side elevation view of one type of a diagonal insertion apparatus of the prior art.

FIG. 6 is a side elevation view of another type of a diagonal insertion apparatus of the prior art.

A working example of the invention will now be explained relative to the assembly of equipment in the form of a wire dot print head for an impact dot matrix printer. Such heads include an insertion receiving component in the form of a wire guide having a plurality of angularly disposed and aligned holes through which shaft-like members in the form of dot wires must be first aligned relative thereto and then inserted therein during the head assembly process. For simplicity, only one such group of angularly aligned holes is illustrated for insertion of one such shaft-like member.

In this connection, reference is now made to FIG. 1 wherein there is shown diagonal insertion apparatus 1 of this invention comprising actuator 1A for performing the perpendicular insertion operation of wire or shaft-like member 3 held in chuck 2 of actuator 1A. A pallet or holding table 5 supports an insertion receiving component 4 comprising a wire dot print head wire guide. Wire guide 4 has a plurality of spatially aligned wire guide holes 9A, 9B, 9C, 9D and 9E which are aligned along axis A at an angle .theta. with respect to the flat surface or horizontal plane of pallet 5. Pallet 5 is moved along a pathway by means of a transport belt 6 and pallet 5 is aligned in a predetermined position beneath actuator 1A by means of bring stop member 11 which is introduced into the pathway of pallet 5. Pallet 5 includes a series of cone shaped receivers 12A, 12B and 12C on its bottom surface. Mounting plate 8 is position below and aligned with pallet 5 and comprises an inclined positioning jig on the surface of which is arranged pins 7A, 7B and 7C having different heights or lengths. Pins 7A-7C are arrange to be aligned with and engage cone shaped receivers 12A-12C in the bottom of pallet 5. Pins 7A-7C are also arranged in prescribed positions with respect to reference means in the form of reference holes 10A and 10B so that they will position wire guide center line A, which is the alignment axis for wire guide holes 9A, 9B, 9C, 9D and 9E in wire guide 4, perpendicular relative to the horizontal plane of pallet 5 as well as move pallet 5 in a predetermined position relative actuator 1A.

Thus, with respect to the arrangement illustrated in FIG. 1, chuck 2 supports wire 3 in a vertical or perpendicular standby position and pins 7A-7C on mounting plate 8 are at their lower standby position. In operation, wire guide 4 supported on pallet 5 is carried via transport belt 6 to the standby position of FIG. 1 wherein the forward motion of pallet 5 is terminated when pallet 5 engages pallet stopper 11 inserted into the pathway of pallet 5 on belt 6. Next, mounting plate 8 containing pins 7A-7C is elevated to the point wherein the ends of pins 7A-7C respectively engage corresponding cone shaped receivers 12A-12C and support pallet 5 above transport belt 6. When the rounded ends of pins 7A-7C enter cone shaped apertures of pin receivers 12 on the bottom of pallet 5, the apertures center on the rounded ends of pins 7A-7C in a manner exemplified in FIGS. 3 and 4 so that accurate positioning relative to the X, Y, Z and .theta. axis is automatically calculated in advance by the arrangement and height of pins 7A-7C and accurately achieved by the elevation of plate 8. This is explained as follows with particular reference to FIG. 4. Even when there is an aberration B between the center line 7' of pin 7 and the center line 12' of pin receiver 12, if aberration B is within the ambient of both rounded end 7" of pin 7 and cone shaped aperture 12" of pin receiver 12, upon engagement of pin 7 within receiver 12, pallet 5 will be automatically shifted laterally to become aligned with pin 7 when plate 8 is elevated causing rounded end 7" to slide into and center in cone shaped aperture 12". Thus, aberration B is effectively eliminated. Furthermore, the positional relationship of three pins 7A-7C together with their differences in height or length will cause pallet 5, along with wire guide 4, to angularly incline so that center line A of wire guide holes 9A-9E will become perpendicular and in vertical aligned relationship with wire 3 as best illustrated in FIG. 2.

At this time, since pins 7A-7C are positioned with respect to reference holes 10A and 10B so that the center line A becomes positioned at a predetermined position, the center line A is likewise positioned at the prescribed X, Y, Z and .theta. axial positions, i.e., when the axis line of wire 3 and the center line of wire guide holes 9A-9E are brought into parallel relationship, they will also be in axial alignment as illustrated in FIG. 2. Next, wire 3, held by chuck 2, is inserted in wire guide 4 along center line A of guide holes 9A-9E by downward movement of chuck 2 via actuator 1A. Chuck 2 then releases wire 3 and thereafter is elevated by actuator 1A. Then, mounting plate 8 descends to its lower standby position permitting the return of pallet 5 to rest upon transport belt 6. Pallet 5 is then transported to the next station by transport belt 6 upon withdraw of stop member 11 from the pathway of pallet 5.

Reference holes 10A and 10B provide a means for determining in each case, the positional relationship of each of pins 7A-7C relative to each other as well as referenced to holes 10A and 10B themselves. Thus, in providing a different jig to accommodate a diffferent insertion receiving components having different angular axes A with respect to the horizontal or other reference plane, the positional relationship or pins 7A-7C relative to reference holes 10A and 10B can be established as the same in each case so that only changes in the height of pins 7A-7C need be changed to invoke a change in the desired angular axis A. Further, if it is necessary to change the distal and positional relation of pins 7A-7C relative to holes 10A and 10B, this can be also accomplished since reference holes 10A and 10B remain aligned relative to the stop postion for pallet 5 supported immediately above jig 8. In other words, by making reference holes 10A and 10B the key reference point for both the relative positional relationship of pins 7A-7C and corresponding receivers 12A-12C relative to each other as well as the distal and positional relationship of pins 7A-7C from holes 10A and 10B, changes in models or the type of insertion receiving component 4 can be easily accommodated without any additional adjustment and alignment by merely replacing jig 8 itself to accommodate the model change or pallet change a as required. Since the elevation of jig 8 is accomplished relative to reference holes 10A and 10B, proper alignment of jig pins 7A-7C is already accomplished without need for additional adjustment. Such jig alignment may be accomplished, for example, by vertical guide rods inserted through holes 10A and 10B during its elevation, although other forms of mechanical alignment or the use optical alignment are contemplated in the practice of this invention. As a result, down time of the assembly line operation due to model changes is materially reduced.

Also, alignment based upon the dimensional size of jig 8 is eliminated since accuracy in this type of alignment approach is, at best, not very acccurate compared to the case where all proper positional and alignment relationships are determined relative to holes 10A and 10B in jig 8. In this manner, proper positional and alignment relationships can be more accurately determined.

In summary, the alignment means of apparatus 1 is composed of the holding table or pallet 5 on which is supported wire guide 4 as well as mounting plate 8 having multiple pins 7A-7C of different lengths. The insertion means of apparatus 1 is composed of actuator 1A supporting wire chuck 2 for holding wire 3. By means of the diagonal insertion apparatus of this invention, positioning and alignment relative to the predetermined X, Y, Z and .theta. axial positions and insertion of wire 3 into wire guide holes 9A-9E are facilitated by arranging a plurality of pins 7A-7C of different lengths in predetermined positions with respect to reference holes 10A and 10B.

While the invention has been described in conjunction with several specific embodiments, it is evident to those skilled in the art that many further alternatives, modifications and variations will be apparent in light of the forgoing description. Thus, the invention described herein is intended to embrace at such alternatives, modifications, applications, variations as fall within the spirit and scope of the appended claims.

## Claims

1. A diagonal insertion apparatus for inserting a shaft-like member into an insertion receiving component having a diagonal hole inclined at an angle with respect to a reference plane and comprising pallet and having a plurality of vertical pins supported from a surface thereof, ends and concurrently elevate and incline said pallet relative to said reference plane in a fixed relationship relative to said jig so that the center line of said diagonal hole is positioned and aligned relative to the axis line of said shaft-like member for aligned insertion thereof.

2. The diagonal insertion apparatus according to claim 1 wherein said pin ends are rounded, a plurality of corresponding cone shaped receivers formed in the bottom surface of said pallet for receiving said rounded ends and automatically centering said pallet relative to the spatial relation of said pins on said positioning jig when said jig is elevated to releasably engage said pallet with said pin ends positioned in said cone shaped receivers.