GB2116896A - A two-direction forming nut former - Google Patents

Abstract

A nut former comprises a body frame 12 in which is mounted an eccentric on a driven shaft 11, the frame 12 being mounted in the middle of the former body 20 and having extending in the horizontal direction from both sides, a ram (or sliding disk) 121 having a impact hammer 30 and a punch 31 at its outer lateral end, with the resultant force of both the reaction of the hammer impact force in one direction and the horizontal component force of the eccentric shaft being utilized to accomplish the operation of hammering and punching process in its opposite direction. <IMAGE>

Description

SPECIFICATION A two-direction forming nut former This invention generally relates to a nut former, and more particularly to a two-direction forming nut former without using a connecting rod.

For the conventional nut formers, when the impact hammer performs blanking operation the reaction force of impact is considerably large, and a major part of it is absorbed and borne by the crankshaft and its bearings, and the huge inertia action produced in the nut former during blanking and cutting causes frequently the whole machine in vibration; this is one of the main reasons that the conventional nut formers are not adapated to operated in highspeed production.

Furthermore, the transmission of conventional nut formers is all by means of a connecting rod to transmit the circumferential motion of a crankshaft to a sliding disk to perform blanking and cutting operations (please refer to Figure 1), once the connecting rod transforms the circumferential motion into a linear reciprocating motion the joint between the crankshaft and the sliding disk is frequently subject to the considerable action of a vertical component force P3 of the crankshaft's motion, thus, and the effective horizontal component of the action force P1 is reduced to P2, and the actual effective horizontal component is P2- F after taking account of the action of frictional force F, and further the frequences of actions by the vertical motion component are twice of that of the crankshaft's circumferential motion, this effect resulting in one of the fundamental reasons of worn sliding disk, having big influences on the stability and balance of horizontal motion of said sliding disk.

Summary of the invention Therefore, the primary object of the present invention is to provide a novel nut former of two-directional impact processes, in which, the course of impact is utilized with the reaction force of the impact action produced in one direction to serve as one of the power sources for blanking and punching in its opposite direction, making the crankshaft and bearings free from subjecting to the reaction of tremendous impact and the impact stress of its inertia action.

Another object of the present invention is to provide a two-directional forming type of nut former without using a connecting rod, wherein a body frame of crankshaft is adapted with its two horizontal sides directly connected to a ram mechanism (or sliding disk) at its two right and left sides as a whole unit.

A further object of the present invention is to provide a two-directional forming type of nut former without using a connecting rod, wherein the frictional resistance of vertical component produced during the circumferential motion of conventional crankshaft being transformed by a connecting rod into the linear reciprocating motion of a sliding disk can be greatly reduced to make the balance and stability of the movement of said ram or sliding disk practically perfect.

Still a further object of the present invention is to provide a kind of power source very valuable for impact processing with the machine body which is transformed from the reaction of impact force originally harmful to the machine body so as to greatly improve the balance and stability of a reciprocating movement between the ram mechanism (or sliding disk device) and the machine body, thus the production ofthe nut former can be increased more than 200%.

Still a further object of the present invention is to provide a two-directional forming type of nut former capable of using a ram mechanism or sliding disk of shorter lengths and obtaining a more stable work than conventional machines with long sliding disks.

Brief description of the drawing The above and other objects, advantages and features of the present invention will become more readily understood from a consideration of the following detailed description and accompanying drawings, in which: Figure 1 is a schematic view of the force analysis of sliding disk action of a conventional nut former; Figure 2 is a partial cross-sectional view for illustration of the present invention; Figure 3 is a schematic view of a preferable embodiment of the present invention; Figure 4 is a schematic explanatory diagram of a body frame according to the present invention.

Detailed description of the drawings As shown in Figure 2, the main feature of the present invention lies in the non-employment of a connecting rod and that a crank-shaft 11 is placed at the central hole of a sliding block 13, which can slide freely up and down inside a square body frame 12 (guided by guide rails 122) and further the two horizontal sides of said square body frame 12 are directly connected to the inner lateral end of the ram or sliding disk 121 to accomplish a two-direction forming of nuts.

To make more understanding of the present invention a preferable embodiment of the invention will be described as follows: Referring to Figure 3, basically, the two-directionforming nut former according to the present invention comprises a crank-shaft device 10 as mentioned above, two right and left horizontal rams (or sliding disk) 121, 121 of a body frame, directly connected to said crankshaft device 10 respectively, impact hammers 30, 30 and punches 31, 31 respectively fitted at the outer lateral ends of said rams 121, 121, and a machine body 20 used to support the whole body.

As mentioned above, the circumferential motion, shown by arrowhead C, of the crankshaft 11 in the invention makes its vertical componentforcetrans- form into an up and down motion of the sliding block 13 as shown by arrowheads U and D, and its horizontal component is applied to the operation of parts processed by the linear reciprocating motion enacted by pushing said rams (or sliding disk) 121 as shown by arrowheads Land R, and also the reaction force of horizontal impact force of punch 31 in impact hammer 30 of the ram (or sliding disk) 121 at its one direction is utilized to act as the impact force of the punch 31 on the impact hammer 30 of the ram (or sliding disk) 121 at its another (opposite) end.

Furthermore, in order to reduce the friction produced during up and down movement of said sliding block 13 in the inner walls of body frame 12 and completely eliminate the vertical component of the sliding friction of said ram or sliding disk, the entire body frame 12 of said crankshaft 11 is slightly canted toward the opposite direction of crankshaft's movement.Herewith, refer to Figure 4, when the sliding block 13 receives drive from the crankshaft 11 and is applied in an action force on the sliding disk 121, its horizontal component is A1 and vertical component is A2: as canting arrangement for the square frame 12, the linear movement of said sliding block 121 is influenced by canting of the pressurized face (square body frame) and deflected to produce an upward vertical component force F1, which, in designing, can contain and just offsets the downward vertical component force F2 produced by the movement of sliding disk 121, that is, the vertical component force F2 produced during the up and down, right and left movements of said crankshaft being transmitted to the ram or sliding disk can be completely eliminated.

Thus, not only the friction between said ram or sliding disk 121 and the machine body 20 is reduced prolonging the using life of machine parts, but also the stability and working efficiency of ram or sliding disk are greatly elevated; as for the canting angle of said block 121 depends on the magnitude of the frictional vertical component.

Now, in order to further prove the feasibility of the present invention, a more specific preferable embo dimentofthetwo-directional nut former according to the present invention as shown in Figure 5, is illustrated. As shown in Figure 5, the actual construction of the two-direction forming type of nut former according to the present invention includes a crankshaft device 10 driven by a flywheel 100 and drive device (not shown), said crankshaft consists of a crankshaft 11, an arbor fitted in the center of said crankshaft 11, a body frame 12 and a sliding block 13 sliding up and down in said body frame, as well as the right and left sliding disks 121, 121 connected respectively directly to said crankshaft device 10 horizontally, in the right and left of sliding disks 121, 121 are fitted respectively sliding disk adjustment plates 124, 124, and at the outer lateral end of said two sliding disks 121, 121 are fitted also necessary impact hammer and punch, blank transfer clamp means 50, 50 and knockout mechanism 40 as in conventional nut formers, as shown in the drawings, the drive sources of the two right and left blank transfer clamp means 50, 50 of the nut former according to the present invention come also from a cam 103 fitted on the crank-shaft arbor at a corresponding end oftheflywheel 100 through a connecting rod 125, sliding grooves (not shown in the drawings) and stock cutting slip tube 126, connected to the right hand blank transfer clamp means, while the left hand blank transfer clamp menas is fixed at a same power source via the connecting rod 127 with the ram.As the knock-out mechanism 40,40, they are also respectively connected from connecting rods 41,42 two a cam 105 on theflywheel arbor 11 so as to alternate the operation of the right and left knock-out mechanism and knock-out the products from the dies.

To make a further explanation, advantages of the present invention are summarized as follows: 1. During the course of impact the reaction of the impact force produced in one direction can be used as a power source needed for the impact operation in the opposite direction, and its crankshaft and bearings will have a two-fold efficacy.

2. No connecting rod is used; thus the distance between crankshaft and sliding disk can be greatly shortened.

3. The frictional resistance of vertical component force produced during the transformation of the circumferential motion of conventional crankshaft by means of connecting rod to a linear reciprocating motion of the sliding disk is completely eliminated, resulting in the balance and stability in operation, which can not only extend the using life of machine parts but also increase the working efficiency of the nut former.

4. All the parts, cost and length of the nut former according to the present invention increase only over the conventional by about twenty percent, but the operative function obtained will be equivalent to twice that of the conventional ones, and also having the economy of decreasing the plant floorspace.

It should be emphasized that in the foregoing descriptions the crankshaft device according to the present invention is only illustrated and applied as an example of the nut former. As a matter of fact, such a crankshaft device according to the present invention can also be applied widely to other blanking and cutting machine bodies; for example, screw head formers and the like and other hand tools, are all deemed as an equivalent application for the present invention.

Claims (4)

1. A nut former comprising a frame body, a driving source mounted at said body, a crankshaft means operatively connected to said driving source and slidably mounted at the middle portion of said frame body including a ram means (or sliding disk) directly connected at both horizontal side of said crankshaft and a impact hammer and a forming punch fixedly mounted at outer lateral ends of said ram (or sliding disk), when the driving source begins to operate, only the action impact force of its horizontal component is delivered to the ram (or sliding disk) to realize a stable and balanced blanking and cutting operation in the processed material; when the reaction of an impact force delivered to the work piece by said impact hammer on a lateral ram (or sliding disk) is added cooperatively with the horizontal component force derived from the crankshaft means and deliver an force onto a work piece in another lateral direction, making the bearings and crankshaft not subjected to the impact stress of the reaction of impact force, and hereby the reaction (force) of strike on the work piece capable of being repeatedly utilized in a blanking and cutting operation on the opposite side effectively to achieve a two-direction formation of nuts.

2. A nut former as claimed in Claim 1, wherein said crankshaft means includes a crankshaft, a sliding block rotationally fixed, with said crankshaft at its center, a body frame of sliding block being mounted in such way that said sliding block can move up and down within a constant distance, the horizontal lateral direction of said body frame is directly fitted connectionally with two rams (or sliding disks) at right and left sides respectively to form an entirety.

3. A nut former as claimed in Claim 1, wherein said body frame is positioned centrally and arranged slightly cantingly with respect to the opposite direction of the crankshaft's rotation.

4. A nut former as claimed in Claim 1 including the application of a two-directional forming device to a screw head former or similar gravity impact forming machines.