US 3916748 A
A punch is installed eccentrically at front end of the cylindrical portion of the punch holder, which is then firmly fixed by means of the crescent-formed seat or split-half hollow cylindrical seat and the clamping block to the inside hole which is furnished at the front end of the ram.
Description (OCR text may contain errors)
United States Patent 1 1 Lee [ Nov. 4, 1975 PUNCH ASSEMBLY  Inventor: Yuan-H0 Lee, No. 85, Jen H0 Road,
Tainan, China /Taiwan  Filed: May 29, 1974 21 Appl. No.: 474,219
 US. Cl. 83/699; 279/1 L  Int. Cl. B26F 1/14; B23B 31/06  Field of Search 83/561, 698, 699; 279/1 L,
 References Cited UNITED STATES PATENTS 1,174,309 3/1916 Clermont et al 279/6 3,544,117 12/1970 Bingham 279/1 L Primary ExaminerJ. M. Meister Assistant ExaminerFred A. Silverberg Attorney, Agent, or Firm-Strauch, Nolan, Neale, Nies & Kurz  ABSTRACT A punch is installed eccentrically at front end of the cylindrical portion of the punch holder, which is then firmly fixed by means of the crescent-formed seat or split-half hollow cylindrical seat and the clamping block to the inside hole which is furnished at the front end of the ram.
4 Claims, 5 Drawing Figures US. Patent Nov. 4, 1975 Sheet 1 of2 FIG. PRIOR ART PRIOR ART FIG.2
H .1 WEEEEEcEEEEw US. Patent Nov. 4, 1975 Sheet 2 of2 3,916,748
PUNCH ASSEMBLY BACKGROUND OF THE INVENTION This invention relates to a punch of which the aligning of the center is easily performed.
In the prior art, the punch used in a nut forming machine as shown in FIGS. 1 and 2 comprises a front end 1 of the ram, and a'punch holder 2.
Referring to FIGS. 1 and 2, the aligning of the respective punch and die center shall be carried out as follows:
First: the adjusting screws located at the right and the left sides of individual punch holder 501 and 502, 502 and 503, 503 and 504, together with the set screw 70] have to beloo sened slightly.
Second: when for the sake of adjusting the punch holder to downward direction, the following steps are necessary:
1. To loosen the screws 3 located at the central top side of punch holder 2; P
2. To turn both, in equal amount, the screws 401 and 402 at both sides of screws 3, until the punch holder 2 is lowered down to the desired position;
3. To tighten the screws 3, and complete the downward adjustment of the punch holder.
On the other hand, for the purpose of adjusting punch holder to upward direction, the following steps are required:
1. To loosen screws 40] and 402;
2. To tighten the screws 3, until the punch holder 2 is up to the desired position;
3. To tighten both screws 401 and 402 at both sides of screws 3, and complete the upward adjustment of the punch holder.
Furthermore, when adjusting the punch holder toward either the left side or right side, said punch holder 2 is to be moved to predetermined position, by means of either tightening or loosening the screws which are located in between two adjacent punch holders or in the gap between the punch holder and the flanged portion provided at front end of the ram.
Hence, the conventional punch mentioned above is considerably complicated in structure and ways of adjustment.
For instance, at least 96 different motions are required to adjust one punch at a desired position. Moreover, due to the mutual interaction existing among the individual movement of each related screw, repetitive motions are required to complete the adjustment. It takes even a skilled worker regularly at least twice work to perform a satisfactory result.
Thus one notes the following deficiencies in the conventional punch means:
1. It takes a lot of time to complete the adjustment of the punch;
2. The equal amount of displacement for each individual screw can hardly be obtained, which results in poor quality of products and low production efficiency.
The main object of this invention is to eliminate the deficiencies mentioned above. Other and further objects, features and advantages of the invention will appear more fully from the following description in ac companying with the drawings, in which:
FIG. 1 is a fragmentary perspective view partly in section of a punch holder used in the prior art;
FIG. 2 is a plan view of whole set of punch holder used in the prior art;
FIG. 3 is a perspective view of a punch holder of the present invention, with partial sectional view;
FIG. 4 is a front sectional view of the punch holder of the present invention, showing how to bring the center of punch up to top of the center of die;
FIG. 5 is the same as shown in FIG. 4, showing how to bring the center of punch down to coincide with the center of die.
Referring to FIG. 3, where 10 denotes front end of the ram, and 11 denotes the hole in the ram.
A crescent-formed seat (or split-half of flanged cylindrical seat) 40 is provided upon the bottom part of the hole 11, which comprises an inner and'outer arc. The center of each arc does not coincide with each other toward one point, and the flange 41, 42 are formed integrally with body at front end and the middle portion of said seat 40, respectively. Furthermore, the flange 41 is connected to the front end of the ram, and lower end of the screws 421, 421 which are threaded in from top side of the ram, are against the respective upper sides of the flange 42 which is located inside the middle portion of the ram. In this way, these screws 421, 421' give the seat a certain extent of tilt.
The cylindrical portion 21 of the punchholder 20, is inserted into the space confined in between hole 11 at front end of the ram and the said seat 40. The clamping block 50 is then mounted upon top of the cylindrical portion 21 as mentioned before. The inner surface of the said clamping block 50 has a properly prepared contour which can be fitted without error to the cylindrical portion 21, and two screws 521, 521' are being turned in from the top face of the ram, so as to push down the clamping block 50 against the cylindrical portion 21, and firmly set it up. Also, there is a flange 52 which is provided in front end of the clamping block 50, for proper contact with front surface of said ram. Furthermore, both sides 53, 53 of the clamping block 50 are being formed in the shape of arc, so as to maintain the fitting of the clamping block 50 to the cylindrical portion 21 during the oscillatory adjustment of the clamping block.
At front end of the cylindrical portion 21, the rectangular head 22, with its one side having exactly the same length as the diameter of the cylindrical portion 21, is made in a solid body. And yet, a punch 30 is provided at right middle portion of said rectangular head 22.
However, the hole 23 is provided for inserting the punch 30 into the rectangular head 22, but the center of the said punch 30 is deviated from that of the center of the cylindrical portion 21. On said rectangular head 22, a groove 24 is out along the horizontal direction at same position of said hole 23. The screws 25, 25 are provided for fastening said punch 30 which is inserted into the said hole 23, so as to secure the punch 30 and the punch holder 20 together.
The measures for aligning the center of punch to that of die, in the present invention will become apparent from the following description in reference with FIG. 4.
Referring to the notation in FIG. 4, wherein x denotes the centering position of die, while d denotes the center of either hole 11 or seat 40. The procedures of carrying out the aligning job in which the center a of punch 30 will be adjusted to fit with the center at of die, are illustrated below;
1. The screws 521, 521 are loosened;
2. The screw 421 is turned in counter-clockwise direction, and the screw 421 is turned in clockwise direction, respectively, so as to tilt the seat 40 to the position as shown in two-dot chain line.
it is quite evident that the center of punch holder is shifted to e, and the center of punch 30 will be displaced from a to b. Therefore, the first stage of operation, tilting of the seat 40 and bringing the center of punch 30 up to the center of dies x can be completed.
3. The punch holder 20 is rotated in an arrowhead direction as shown in FIG. 5. In this way, the punch holder 20 is holding its center at e constantly, and shifting the center of punch from b to 0 (x) so as to complete the alignment of the center of punch with that of die x The present invention as illustrated hereinbefore, wherein the additional excellent result can also be obtained through the embodiment of present invention.
1. Because each of seat 40 and punch holder 20 are given an individual center, which constitutes in eccentric way, so that merely by means of rotating them, the eccentricity of each solid body can be simultaneously adjusted, and resulted in completing the alignment of two centers at one time. Therefore, the advantages of the present invention: simplicity in construction, less damage, easy adjustment are readily achieved, and the adjusting job can be done properly by even an unskilled workman.
2. Only 33 different motions are necessary for completion of adjusting job in the present invention, so as to save working time by 96.698.3% in comparison with the motions required in the prior art.
3. By the embodiment of the present invention, steady and sturdy operation can be obtained. This will result in. increasing the production rate by 40% and the product quality.
It will be understood that although the description mentioned above is taking an example specifically used in a nut forming machine, it can also be applied to any other type of punch used other than nut former or heading forming machine.
The invention maybe embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and the scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and the range of equivalency of the claim are therefore intended to be embraced therein.
1. A punch mounting assembly and ram for use with a nut forming machine or the like comprising: a cylindrical bore formed in said ram; a semi-cylindrical seat rotatably mounted in said bore; means defining a semicylindrical cavity in said seat; the diameter of said semicylindrical cavity being less than that of said seat, the axes of said cavity and seat being essentially parallel but not coincident whereby said seat is crescent shaped in cross-section; a cylindrical punch holder mounted in said cavity, and means for mounting a punch on said punch holder on an axis essentially parallel to but noncoincident with said axes of said cavity and seat whereby said punch may be adjusted in said ram within a plane normal to the axes of said cavity and seat by independent rotation of said seat and said cylindrical punch holder.
2. The punch mounting assembly as claimed in claim 1 wherein said semi-cylindrical seat is mounted within a lower half of said cylindrical bore in said ram.
3. The punch mounting assembly as claimed in claim 1 further comprising clamping block means for firmly securing said cylindrical punch holder to said seat and said ram.
4. The punch mounting assembly as claimed in claim 1 further comprising screw means threaded in said ram for incrementally adjustably rotating said seat about its said axis.