US3177697A

US3177697A - Compressing device

Info

Publication number: US3177697A
Application number: US156615A
Authority: US
Inventors: William R Over
Original assignee: AMP Inc
Current assignee: TE Connectivity Corp
Priority date: 1961-12-04
Filing date: 1961-12-04
Publication date: 1965-04-13
Anticipated expiration: 1982-04-13
Also published as: NL131543C; NL286160A; GB946285A; CH399561A; BE625632A; DE1302967B

Description

April '13, 1965 w. R. OVER 3,177,697

COMPRES S ING DEVICE Filed Dec. 4, 1961 2 Sheets-Sheet 1 April 13, 1965 w. R. OVER COMPRESSING DEVICE 2 Sheets-Sheet 2 Filed Dec. 4, 1961 United States Patent 3,177,697 COMPRESSENG DEVKCE William R. (fiver, Union Deposit, Pa, assignor to AMP incorporated, Harrisburg, Pa. Filed Dec. 4-, 1961, Ser. No. 156,615 7 Claims. (Ci. 72-466) This invention relates to compressing devices such as hand tools or presses. The invention is herein disclosed in an embodiment comprising a tool having a C-shaped frame for crimping electrical connectors, but it will be apparent that the principles of the invention are applicable to other compressing devices such as larger hand held tools and small bench mounted presses.

Under ordinary circumstances, a hand tool, such as a wrench, is not required to have a high degree of precision and exactness as regards the movement of the jaws towards and away from each other and as regards deflection (i.e. elastic deformation) of the tool during use. If a part is gripped by the tool, as is the case where an adjustable wrench is used to tighten or loosen a nut, the jaws of the wrench need not be precisely aligned with each other and the deflection of the tool jaws is of no importance so long as the tool is capable of gripping the part being worked upon. There are circumstances, however, where hand tools are use for critical operations such as the crimping of electrical connectors and terminals. In most crimping operations, the crimping dies are designed with the intention that they will move along a substantially perfectly straight line path towards each other when they crimp a connector. If the dies move obliquely towards each other, inferior results are obtained even if the departure from rectilinear movement is slight. it follows that hand tools for such operations should be capable of moving the dies together along a substantially straight line path in a precise and exacting manner.

In the case of C-head or C-frame type tools and presses, the problem of achieving precise closing of electrical connector crimping dies has been particularly troublesome. Tools of this type usually have a fixed die mounted on one of the arms of the C and the other die mounted on a ram which is reciprocable in the other arm and across the gap of the frame. Where the fixed die is rigidly mounted on the one arm, it has been found that this arm will deflect under normal crimping forces and such deflection misaligns the dies with respect to each other. As a result, the crimping forces in the dies and applied to the connector become unbalanced and are partially wasted in that they by-pass the connector and are expended in stressing and deflecting the tool frame. The resulting crimped connection will he imperfect under such circumstances because of the assymmetrical application of crimping force. As a practical matter, this problem usually can not be completely avoided by making the frame stronger because of the manner in which the frame of a C-head type tool is stressed in use, that is, theforces are appliw in a manner which inherently tends to move the arms of the frame apart.

Other problems exist in conventional rigid frame C- head tools with rigid die mountings. For example, the frame, it cast or forged, must be machined for the ram guide and die mounting means in a precise and ex- 7 acting manner. Additionally, such tools are often ineflicient in that much of the force applied to the ram or movable die is Wasted in deflecting the arms and is not channeled through the part being compressed.

An object of the present invention is to provide an use. A still further object is to provide a C-frame type hand tool for crimping electrical connectors and having improved crimping, die holding and aligning means which is substantially independent of the tool frame. A further object is to provide a C-frame type tool of improved efflciency.

These and other objects are achieved in a preferred embodiment of the invention comprising a pair of generally C-shaped frame members having handle extensions on one end thereof. The C-shaped frame members are secured together in spaced apart side-by-side relationship by suitable fasteners and spacers. A block is mounted between corresponding arms of the frame members for pivotal motion about an axis extending normally of the plane of the frame members and a fixed crimping die is mounted on this block. A movable die is mounted on a die guide plate which slidably engages a guideway integral with the fixed die in order to guide the movable die rectilinearly towards and away from the fixed die. The movable die is reciprocated by means of a block which is contained between the frame members and guided for rectilinear motion by means of guide plates which cooperate with the spacers which secure the frame members together in spaced apart relationship. Amovable handle or lever is pivotally mounted to the frame of the tool and a suitable linkage is provided to move the movable block towards and away from the fixed block. By virture of the pivotal mounting of the fixed block, this fixed block and the fixed die swivel with respect to the frame in the event of deflection of the frame members during use so that the fixed die remains parallel with respect to the movable die.

The salient feature of the invention is that the C-shaped frame is primarily a load carrying device and it is not relied upon entirely for precise location and guidance of the crimping dies, the dies being located in the frame and guided by the guide plates. This feature of the invention permits the use of a relatively light-weight frame and avoids the need for machining guideways in the frame for the movable die. In the case of one embodiment of the invention disclosed below, the frame can be made of relatively thin stampings rather than a heavy forging.

In the drawing:

FIGURE 1 is a perspective view of a tool in accordance with the invention.

FIGURE 2 is a perspective View illustrating the die guiding and aligning mechanism of the embodiment of FIGURE 1.

FIGURE 3 is a side view with parts broken away of the embodiment of FIGURE 1.

FIGURES 4, 5, and 6 are views taken along the lines 4-4, S-5, and 6-6 of FIGURE 3.

FIGURE 7 is a side view illustrating the manner in which deflection of the tool frame is compensated for during use.

FIGURE 8 is a fragmentary frontal view illustrating the manner in which tools in accordance with the invention permit the use of slightly warped frame plates,

:3 the warpage in this view being highly exaggerated for purposes of illustration.

The disclosed embodiment of the tool comprises a pair of frame plates 2 having C-shaped head portions with upper arms 4 and lower arms 6. Handle extensions 8 project from the lower arms 6 and a hand grip 10 is advantageously fitted over the ends of these extensions. A block 12 is mounted between the upper arms 41 by means of a fastener M which extends through the plates 2 and through an opening in the block. For reasons which will be apparent as the description proceeds, block 12 should be capable of pivotal motion about the axis of fastener M.

The opposed faces of the plates 2 bear against the sides of block 12 and against cylindrical spacers 21, 25, these spacers being located in the handle 3 and in the web of the head portion respectively and being held in place by rivets 2d, 24 which extend through the spacers. An additional rivet 22 is provided in the lower portions of the handle extensions 8 although this rivet need not perform a spacing function. A strap or plate 26 is secured to the surface of block 12 between the frame plates 2 and extends downwardly towards the gap of the tool head. At its lower end, this strap has an L-shaped bracket 28 secured thereto by means of a rivet 27 and a pair of upper or fixed crimping dies 3t 31 are secured to this bracket by a screw 35, one of these dies being provided to crimp the wire barrel portion of the connector while the other die is provided to crimp the insulation support portion of the connector.

A reciprocable block 32 is contained between the lower arms 4 of frame plates 2 and has a guide plate 34 on each side thereof secured to the block by means of a roll pin 33 and a pin 56. These guide plates each extend downwardly toward the handle extensions 8 and have slots 36 in their lower ends to permit their movement past a pin or rivet 18 which extends between the plates. The guide plates also have upper extensions which project inwardly towards the web of the tool head and these upper extensions are slotted at 4t) to permit movement of the plates past a pin or rivet 16 which also extends between the frame plates. The reciprocable block 32 is, thus, guided by means of the

pins

16, 18 and the

slots

36, 40 in the guide plates.

Advantageously, thin Teflon (polytetrafluorethylene) washers 39 are provided on

pins

16 and 18 between the surfaces of the guide plates 34 and the frame plates 2. These Washers constitute a bearing surface over which the guide plates move, Teflon being a preferred material for these washers because of its self lubricating property.

A .die guide member and die mounting plate 42 is contained between the frame plates 2 and clamped to the rear surface of the block 32 by means of a machine screw 46 and a slot 44 in the lower end of the die mounting plate, slot 44 being somewhat wider than the diameter of the screw to permit both axial and lateral adjustment for reasons explained below. An L-shaped bracket 43, similar to the bracket 28, is riveted to plate 42 at a location above the surface of block 32 and movable dies 41, 43 are mounted in this L-shaped bracket. The crimping dies shown are of the type which have bearing surfaces, as shown at 45, on each side of the surfaces which support and crimp the connector. In the case of dies of this type, these bearing surfaces should be parallel to and against each other when the dies reach their fully closed position as shown in FIGURE 3.

A screw 50 threaded into the upper surface of the block 32 has an enlarged head which supports the lower dies and transmits thrust thereto from the block 32. Screw is locked in position by a recessed head set screw 51 disposed in the tapped hole which receives screw 46. The screw 50 provides a convenient means of adjusting the tool to compensate for manufacturing variations in the sizes of the parts of the linkage and blocks 12, 32 as is discussed below.

The upper end of the plate 42 extends through a recess 29 in bracket 28 and is slotted at 54- to permit movement past the rivet 27 by means of which bracket 28 is secured to strap 26. This arrangement maintains the two dies in proper orientation with respect to each other and prevents lateral movement of either die out of the plane of the frame plates.

As shown in FIGURE 3, the rear face of block 12 has a recess for reception of the end 52 of the die guide plate, this recess being somewhat oversized with respect to the end of the die guide plate.

Any suitable type of linkage may be provided to reciprocate the block 32. In the disclosed embodiment the lower end of this block is slotted and pivotally connected at 56 to one link 58 of a toggle. Link 58 is pivoted at 5? to the other link 69 of the toggle mechanism which in turn is pivoted on a fixed axis at 18. Link 60 of the toggle has cars 62 extending on each side of the link 58 and a cam follower or roller 64 is rotatably mounted between the ends of these ears. This cam follower is en gaged by a contoured cam surface 66 of a block 68 which is mounted between a pair of handle levers 70 pivoted at their inner ends between the frame members 2 on pin 16. The lower ends of the lever formed by the plates 70 is advantageously provided with a hand grip '76 similar to the grip In) and these lower ends are maintained in proper spaced apart relationship by rivets 72, 74 having cylindrical spacers in surrounding relationship thereto. This type of linkage is more fully disclosed and is claimed in U.S. Patent No. 3,029,670.

Advantageously, a ratchet type device 78 is provided between the handles of the tool in order to ensure complete closure of the dies as is explained in U.S. Patent 2,618,993.

In use of the tool, an electrical connector is placed between the crimping dies and the handle 76 is moved relatively towards the handle lit) to straighten the toggle linkage and drive the block 32 and with it the movable die towards the fixed die. The toggle linkage is normally maintained in broken condition by a spring 61 connected at one end to a hook on link 6t and at its opposite end to a previously mentioned pin or rivet 20.

There are several advantages which can be achieved in tools made in accordance with the invention. In general, it can be stated that the practice of the invention will result in a tool which achieves perfect, or almost perfect, mating of the dies. The invention also results in the achievement of a tool having good efiiciency with respect to the utilization of the force developed by the handles and force multiplying linkage. A further advantage is that a tool in accordance with the invention can be made relatively light in weight and can be manufactured, if desired, with stamped or other low cost lightweight frame parts. A discussion of some of the more subtle aspects of the invention which contribute to the foregoing advantages will now be presented.

In virtually all C-frame type tools or presses, it can be expected that the arms of the frame (arms 4 and 6 of the disclosed embodiment) will deflect and move apart when the frame is stressed during use. If the fixed die is rigidly mounted in one of the arms and is in substantially perfect alignment with the movable die when the frame is not stressed, then the fixed die will be carried out of alignment when the frame is stressed. This effect can be highly detrimental in the case of electrical connector crimping dies designed to mate in substantially perfect alignment with each other.

FIGURE 7 illustrates the deflection of the upper arms 4 when the dies are closed, the amount of deflection being highly exaggerated for purposes of illustration. In FIG- URE 3, the upper arms 4 are not visibly deflected. It can be seen that deflection of the upper arm 4 does not result in misalignment of the dies for the reason that when the bearing surfaces of the dies come together, the upper block 12 will pivot about its axis 14 as deflection proceeds and alignment will be maintained. Pivoting of block 12 is,

brought about by the unbalanced forces (i.e. greater on the righthand bearing surfaces than on the left in FIG- URE 7) which develop as a result of the tendency toward misalignment. The dies are thus self-aligning and the amount of deflection in the arms 4 is of no significance. This feature permits tools in accordance with the invention to be made of relatively light-weight parts; for example,

. stampings rather than forgings although this feature can be incorporated into a tool having a forged or other unitary frame.

An additional feature of the invention is that compensation is made for warpage of the frame plates 2 of the tool. Where these frame plates are stamped from sheet stock and subsequently heat treated, it frequently happens that they will not be perfectly flat but will be bowed or warped as shown in FIGURE 8. The warpage may be present in the stock initially or it may be imparted thereto during stamping or heat treating. FIGURE 8 is a highly exaggerated frontal view showing a tool having its two frame plates 2 warped in the same direction so that they are substantially parallel to each other and have an arcuate profile. The dies are not shown in this view for reasons of clarity and because of the high degree of exaggeration of the warpage.

In tools in accordance with the instant invention, the crimping dies will move along a straight line towards and away from each other in spite of tool frame warpage for the following reasons. The lower (movable) dies are secured to the guide 42 by means of the L-shaped bracket 43 which is riveted to the guide. The upper end 52 of this guide plate is slidably received in the recess 29 which is only slightly wider than the guide plate itself so that the guide plate and the lower dies. are restricted to movement along a straight line path towards the fixed dies, this straight line path constituting a chord with respect to the curvature of frame plates 2.

Since the reciprocable block 32 is relatively remote from the block 12, it can not be aligned with the block 12 and the guide plate 42 because of the curvature of frame plates 2. The slot 44 in the lower end of guide plate 42 is wider than the diameter of screw 46 so that under the conditions of FIGURE 8, this screw is disposed on the lefthand side of the slot. In this view, it will be noted that the center line of the guide plate and the center line of block 32 extend angularly of each other, a condition which is brought about by the curvature of frame plates 2. It will also be apparent that the surface of set screw extends angularly of the underside of the lower die so that when the handle 76 is moved towards the handle ill, the lefthand side only of this set screw will initially transmit force to the lower die. As movement of the handle '74) continues, however, the block 32, is realigned with respect to the underside of the lower dies until the center line of block 32 is almost parallel to, but offset from, the center line of the guide plate. During alignment of block 32, the guide plates 34- are similarly cocked or aligned since these members are secured to the block by the pin 33.

in order to permit the dies, the die guide plate 42, the

blocks

12, 32 and the guide plates 3% to react to warped frame plates 2 in the manner described above and maintain their alignment with respect to each other, it is necessary that clearances be provided in some of these parts. For example, a clearance must be provided between the plates 34 and the sides of the frame plates 2 and between the block 32; and the sides of the frame plates. There must also be sufiicient clearance between the upper arms 4 of the frame plates and the upper end of the die guide plate In other words, moving partsmust not be so closely positioned between the frame plates that they might bind if the frame plates are Warped.

As stated above, the block 32 is realigned until its center line is almost parallel to, but offset from, the center line of the guide plate. Perfect parallelism of these two center lines is not necessarily achieved for the reason that some deflection (elastic deformation) of block 992, of set screw 5d, of the die guide plate 4-2 and other associated parts will take place and these deflections will contribute to the bringing of the two dies into alignment with each other. This deflection takes place for the reason that the parts are not axially and symmetrically stressed when the dies are moved relatively towards each other but tend to be stressed more on one side than on the other; for example, the set screw will be compressively stressed on its lefthand side as viewed in FIGURE 8 to a greater extent than on its right side. While deflection of these parts to some extent is inevitable and, in fact, beneficial, the realignment of the parts as previously explained is of greater importance in achieving alignment of the dies than is the deflection effect.

FIGURE 8 assumes the Worst possiblecondition of warpage of the frame plates 2. If these frame plates are warped in opposite directions, i.e. if each plate is warped inwardly or outwardly during manufacture, they will be brought into substantial parallelism when they are secured together by the

fasteners

16, 18 and spacers 21, 25 and by the block 12 which functions as a spacer. Under ideal conditions of manufacture, the frame plates will not be warped at all but such ideal conditions will not always obtain in stamping operations or other forming operations where thin plate-like members are being formed and manu facturing tolerances must, as a practical matter, be allowed. It is emphasized that FIGURE 8 is a highly exaggerated view. Where warpage is present in the frame plates 2, it will be very slight and would not be visible to the unaided eye.

As previously mentioned, screw 50 is provided for the purpose of adjusting the tool to achieve substantially perfect bottoming of the dies and optimum utilization of the toggle mechanism. To use the toggle mechanism to best advantage, the links 58, 6% should be in a straight line with respect to each other at the end of the stroke. To achieve this result, the bottoming surfaces of the dies should be against each other when the links are in alignment and the handles are fully closed. Because of manufacturing variations in the links and blocks 12, 32 and because of the deflection of the upper arms 4 of the frame members when the tool is used, perfect bottoming usually can not be achieved without adjustment of each individual tool. In the case of the preferred embodiment, the screw 59 is adjusted until the required spacing between the head of the screw and the underside of block 12 is obtained when the handles are closed, the links: are in alignment,

and a compressive force equal to the crimping force is being developed. This adjustment can be made With a gage. Under these conditions, the parts will be under their normal workingstresses and the upper arms 4 will be deflected.

An overall advantage achieved is that a C-head tool in accordance with the invention has :a higher efliciency than a rigid frame C-head tool or" the conventional type where both tools have the same type of actuating linkage and other factors are the same. The term efiiciency as used above refers to the handle pressure required by the tool operator to achieve a given compressive force onthe terminal being crimped, a low handle pressure being a desideratum. The reason for this advantageof the invention is that since the dies are substantially perfectly aligned with each other when they are closed, virtually all of the force applied to the dies is transmitted uniformly through the dies and the connector being crimpec. Thus, the force which causes the upper arms .4 to deflect is transmitted through the: dies and the connector while the abutting ,die bottoming surfaces are parallel to and against each other. In the case of a rigid frame tool having the upper die rigidly secured to the frame, on the other hand, any slight misalignment of the dies results in an unbalanced stress pattern in the dies with some of the applied force by-passing the connector itself.

'Under such circumstances, at least some of the applied force will be wasted since it causes deflection of the C-frame without being utilized to crimp the connector.

The precision of closure of the crimping dies is thus controlled by the elements shown in FIGURE 2, namely blocks 12, 32, by the straps and

plates

26, 42, by the

die holders

28, 48, and by the set screw 50. The path of reciprocation of the movable block 32 is determined entirely by the pins 1%, 16 and by the

slots

36, 40 in the guide plates. The precision of operation of the tool does not then depend upon the frame itself but by the pins 16, T18 and their location with reference to the pin M. Because of this arrangement, considerable manufacturing variations can be tolerated in the frame parts or in the linkage without sacrifice of precision in the operation of the tool.

It will be noted that the guide pins 16, 13 are relatively widely spaced apart and are remote from block 32. This arrangement minimizes arcuate movement of block 32 due to the clearances between the

pins

16, 18 and the

slots

40, 36. Since the plates move relatively past the pins, there must be a slight clearance between these parts. This clearance, however slight, permits arcuate motion of plates 34 and block 32 about either of the pins as a center. For a given clearance between the pins and slots, the amount of arcuate movement is reduced as the spacing between the pins is increased. It follows that wide spacing between the pins as in the disclosed embodiment is desirable.

It will be apparent that some features disclosed in the foregoing description can be employed independently of other features if desired. For example, the pivoted upper die arrangement can be used in a tool having a solid forged or machined frame and having a conventional ram which is movable in a guideway in the frame as disclosed in US. Patent No. 3,029,670. A tool of this type would have the advantage of self alignment of the upper die in the event of deflection of the C-frame but would otherwise be conventional. Alternatively, the disclosed arrangement of using the slotted guide plates 34 and the

pins

16, 18 to guide the movable die can be employed without necessarily having a pivoted upper die.

Changes in construction will occur to those skilled in the art and various apparently different modifications and embodiments may be made without departing from the scope of the invention. The matter set forth in the foregoing description and accompanying drawings is offered by way of illustration only. The actual scope of the invention is intended to be defined in the following claims when viewed in their proper perspective against the prior art.

I claim:

1. A compressing tool comprising, a C-shaped frame member, a fixed die pivotally mounted in one arm of said frame member on an axis extending normally of the plane thereof, a block reciprocable towards and away from said fixed die, a die guide member secured to said block, said guide member being adjustable towards and away from said fixed die, guideway means integral with said fixed die for slidable reception of said guide memher, a movable die secured to said die guide member intermediate the ends thereof, and adjustable thrust transmission means on said block in supporting relationship to said movable die, said fixed die being self alignable with respect to said movable die upon deflection of said frame member, and the shut height of said dies being adjustable upon adjustment of said thrust transmission means and said die guide member.

relationship, afixed die pivotally mounted between one pair of corresponding arms of said frame members on an axis extending normally of the planes thereof, a block contained between the other pair of corresponding arms of said frame member, said block being reciprocable towards and away from said fixed die, a die guide member secured to said block for adjustment towards and away from said fixed die and for lateral adjustment with respect to said block, guideway means integral with said fixed die for slidable guiding reception of said guide member, a movable die secured to said die guide member intermediate the ends thereof, and adjustable thrust transmission means on said block in supporting relationship to said movable die, the shut height of said dies being adjustable upon adjustment of said thrust transmission means and said die guide member parallel to the path of reciprocation of said block.

4. A compressing tool comprising, a pair of C-shaped frame members secured in spaced apart parallel relationship, a fixed die pivotally mounted between corresponding arms of said frame members on an axis extending normally of the planes thereof, a movable die reciprocable towards and away from said fixed die, a die guide member secured to said movable die and extending towards said fixed die, guideway means integral with said fixed die for slidable reception of said die guide member, guide plates for guiding said movable die along a rectilinear path, said guide plates being secured to said movable die on each side thereof and between said frame members, at least two slots in said guide plates, and guide means integral with said plates and extending into said slots to guide said plates along a rectilinear path.

5. A compressing tool comprising a pair of C-shaped frame members in parallel spaced apart relationship, at least two guide pin members extending between said frame members, a pair of guide plates disposed between said frame members, said guide plates having a pin-slot relationship to said guide pin members, a block secured to and held between said guide plates, a movable die on said block, a fixed die mounted on said frame for cooperation with said movable die, and means for reciprocating said block, said block being guided along a rectilinear path by said pin slot relationship between said guide pin members and said guide plates.

6. A compressing tool comprising, a pair of C-shaped frame members secured in parallel spaced apart relationship, said frame members having extensions on one end thereof forming a handle for said tool, a fixed die pivotally mounted between said frame members in the one arm thereof which is remote from said handle on an axis extending normally of the planes of said frame members, a reciprocable block disposed between the other arm of said frame members, a die guide plate adjustably secured to and extending from said reciprocable block to said fixed die, guideway means in said fixed die for reception of said die guide plate, a movable die on said die guide plate intermediate the ends thereof, thrust transmission means in said reciprocable block and supporting said movable die, said thrust transmission means being adjustable in the direction of reciprocation of said movable block thereby to permit adjustment of the shut height of said dies, said block having a guide plate secured thereto on each side thereof and between said frame members, at least two transverse guide members extending between said frame members and proximate to said guide plates, and slots in said guide plates for permitting movement thereof past said transverse guide members while guiding said guide plates and said reciprocable block along a rectilinear path.

7. A compressing device comprising, a hollow frame means, at least two guide pins extending through said frame means, a pair of guide plates disposed within said frame means and between the opposed sides thereof, said guide plates having a pin-slot relationship to said guide pins, a block secured to, and held between, said guide plates, a movable die mounted on said block, a fixed die $9 mounted on said frame means for cooperation with said 2,777,345 movable die, and means for reciprocating said block 2,800,642 along a rectilinear path determined by said pin-slot re- 2,903,929 lationship between said guide plates and said guide pins. r 2 J References Cited by the Examiner 0 3,074,458

UNITED STATES PATENTS 1,858,418 5/32 RoWley. 2,712,252 7/55 Landis.

1@ Reider. Demler. McVey. Evans et a1.

Stoltz 153-1 Evans.

WILLIAM FELDMAN, Primary Examiner.

10 WALTER A. SCHEEL, Examiner.

Claims

1. A COMPRESSING TOOL COMPRISING A C-SHAPED FRAME MEMBER, A FIXED DIE PIVOTALLY MOUNTED IN ONE ARM OF SAID FRAME MEMBER ON AN AXIS EXTENDING NORMALLY OF THE PLANE, THEREOF, A BLOCK RECIPROCABLE TOWARDS AND AWAY FROM SAID FIXED DIE, A DIE GUIDE MEMBER SECURED TO SAID BLOCK, SAID GUIDE MEMBER BEING ADJUSTABLE TOWARDS AND AWAY FROM SAID FIXED DIE, GUIDEWAY MEANS INTEGRAL WITH SAID FIXED DIE FOR SLIDABLE RECEPTION OF SAID GUIDE MEMBER, A MOVABLE DIE SECURED TO SAID DIE GUIDE MEMBER INTERMEDIATE THE ENDS THEREOF, AND ADJUSTABLE THRUST TRANSMISSION MEANS ON SAID BLOCK IN SUPPORTING RELATIONSHIP TO SAID MOVABLE DIE, SAID FIXED DIE BEING SELF ALIGNABLE WITH RESPECT TO SAID MOVABLE DIE UPON DEFLECTION OF SAID FRAME MEMBER, AND THE SHUT HEIGHT OF SAID DIES BEING ADJUSTABLE UPON ADJUSTMENT OF SAID THRUST TRANSMISSION MEANS AND SAID DIE GUIDE MEMBER.