JPH0439022Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a head (stamping unit assembly) of a stamping machine for stamping an identification symbol on the surface of a metal part.

(Prior Art) As shown in FIG. 5, a stamping machine for stamping the identification symbol or the like on the surface of a metal component generally includes a stamping character ring 2 having a marking 1 on its periphery, which is attached to a U-shaped head by a cylindrical shaft 3. The stamping head 5 supported on the main body 4 is attached to the tip of the piston rod 7 of the press cylinder 6, and the press cylinder 6 stamps at the specified location of the metal part W which is temporarily fixed to the opposing position of the head 5 with the fixtures 8 and 9. The printing head 5 is pressed against the marking 1 to form a stamp.

(Problem to be solved by the invention) However, in the conventional marking head described above, the two assembled parts (or separated during machining as shown in Fig. 5 - in the case of Fig. 5, the connecting rod main body W1 and the connecting rod body W1) When used to simultaneously print identification symbols on cap W2 (components attached to cap W2), the surface to be marked may be unprocessed due to machining errors or may be unprocessed.
There is a drawback that even if there is a slight difference in level between parts, the part on the lower side will not be engraved.

This is a stamping tool as shown in Japanese Utility Model Application Publication No. 58-96816, that is, a roller die (the stamped character ring) is supported by a cylindrical shaft on a U-shaped holding part (head body), and both ends of the roller die are supported. Since the amount of protrusion of the print is changed according to the change in the thickness of the print guide part, whose thickness is gradually changed in the circumferential direction, the amount of protrusion of the entire roller die is However, there is no difference in the amount of protrusion between the printing on the left and right sides of the roller die, and therefore the above problem is not solved.

The purpose of the present invention is to solve the above-mentioned problems and provide an engraving head that is capable of engraving even parts whose engraving surface has a step at the left and right ends of the roller die (engraved character ring). .

(Means for Solving the Problems) The present invention for achieving the above object will be explained with reference to FIGS. 1 to 4 corresponding to embodiments. This is an engraving head in which the axial center of a shaft 15 that holds an engraved character ring 13 therebetween is approximately the same as the inner diameter of the shaft hole 14 of the character ring 13, and tapers toward both ends. .

(Function) With the above configuration, the marking head of the present invention can be
As shown in the figure, attach the two parts 16 and 17 to the bolt nut 1.
The product 19 assembled by 8, the two parts 16,
17. When used for stamping, the central portion 15a of the shaft 15 is pressed against the product 19 side by the pressing cylinder 6, so that the center portion 15a of the shaft 15 is pressed against the stamped character ring 13. The inner wall of the shaft hole 14 is pressed, but among the prints 20 and 21 on the left and right ends of the engraved character ring 13, the print 20 is printed on the part 16.
After contacting the surface, the engraved character ring 13 is tilted with respect to the axis of the shaft 15, thereby causing the engraved character ring 13 to
1 is in contact with the surface of part 17, and both prints 20 and 21 are 2
The parts 16, 17 can be engraved.

(Example) In the figure, 10 is a U-shaped head main body, and a connecting part 10a with a piston rod 7 of a pressing cylinder 6 shown in FIG. 5 is formed at the base end, and both arm parts 11,
12 has shaft holes 11a, 1 for supporting the shaft 15.
2a is open.

Reference numeral 13 denotes an engraved character ring, which has gear-shaped printing parts 20 and 21 around both ends thereof, and a U-shaped character feed lever 23 arranged at both ends of the ring, which is loosely engaged with the shaft 15. The head 23 is disposed between both arm portions 11 and 12 of the U-shaped head main body 10 so as to have a gap C between the side surfaces thereof.

As shown in FIG. 1 in a cross section passing through the axis of the shaft 15, the inner diameter of the shaft hole 14 of the engraved character ring 13 is approximately the same at the center and both ends, but once toward both ends it becomes arcuate. The diameter is gradually becoming smaller.

Although the center and both ends of the shaft 15 are substantially the same as the inner diameter of the shaft hole 14 of the character ring 13,
The diameter may be reduced linearly from there toward both ends.

The character feed lever 23 is pulled upward by a spring 24 as shown in FIGS. 3 and 4, and has a feed pawl 26 inside thereof that is pressed against the engraved character ring 13 by a coiled spring 25. This nail 26
The engraved character ring 13 is rotated at the tip of the engraved character ring 13. 27 is a stop claw, engraved character ring 1
On the opposite side across the U-shaped head 10
The plate springs 28, 2 are rotatably attached to the plate springs 28, 2.
9 is pressed against the engraved character ring 13.

The main marking head 30 configured as described above
After attaching the connecting portion 10a to the tip of the piston rod 7 of the pressing cylinder 6 as shown in FIG. 5, first rotate the character feed lever 23 in the direction of the arrow,
The leaf spring 2 of the stop pawl 27 is caused by the feed pawl 26.
The stamped character ring 13 is rotated against the forces 8 and 29 to place the desired characters 20 and 21 in the position shown.

When the pressure cylinder 6 is actuated, the marking head 30 is advanced via the piston rod 7 toward the side of a preset metal product 19, for example, a connecting rod. At this time, if there is a step S on the side of the main body 16 of the cooking rod 19 and the cap 17, first print 2
0 comes into contact with the stove body 16, and when the marking head 30 moves further forward, the central part 1 of the shaft 15
Engraved character ring 13 pressed by 5a
is inclined as shown in Fig. 1 within the range of the gap C,
Since the print 21 contacts the cap 17, an average force is applied to both the prints 20 and 21 in this state, and a clear print is made on the stove body 16 and the cap 17. At this time, the height difference between the stove body 16 and the cap 17 is usually about 0.1 mm.
Since the maximum width is 0.2 mm, distortion of the stamp due to the inclination of the stamped character ring 13 is hardly a problem.

When the engraved character ring 13 is tilted, if the center 15a of the shaft 15 has an arcuate cross section as shown in FIG. Accordingly, it moves smoothly on the arc portion and applies an average force to the prints 20 and 21. Also, shaft 1
5, which tapers linearly from the center to both ends, is suitable for a case where the size of the step S is constant, and the straight portion of the shaft 15 and the shaft hole 14 of the engraved character ring 13 are in close contact with each other. Forces on the markings 20, 21 and especially from the shaft to the stamping character ring 1
3 is transmitted evenly and stress concentration is avoided.

(Effects) Since the present invention is constructed as described above, the center of the shaft that holds the engraved character ring in the axial direction is made to be approximately the same as the inner diameter of the shaft hole of the engraved character ring, and the shaft is oriented toward both ends. By making the ring thinner, even if there is a difference in level between the two assembled parts, the engraved character ring is inclined and the stamp can be evenly engraved between the two parts.

In addition, when the shaft has an arc-shaped cross section at the center, the engagement point of the engraved character ring with the shaft hole moves along the arc according to the size of the step, so that an average force can be applied to both types of printing.

In addition, if the shaft is tapered linearly from the center to both ends, the straight part of the shaft and the shaft hole of the engraved character ring will come into close contact, and the force for printing on both sides and the force from the shaft to the engraved character ring will be transmitted evenly. This has the effect of avoiding stress concentration.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the proposed head, Figure 2 is a view corresponding to the sectional view taken along line A-A in Figure 1, Figure 3 is a front view, and Figure 4 is a cross-sectional view of the proposed head.
The figure is a side view, and FIG. 5 is a plan view of a conventional marking head, an operating device for the marking head, a part to be stamped, and a fixing device therefor. 6...Press cylinder, 10...U-shaped head body, 13...Engraved character ring, 14...Shaft hole of the same ring, 15...Shaft, 19...Product or part to be engraved, 20, 21... Printing, 23...Character feed lever, 30...Engraving head.

Claims (1)

[Claims for Utility Model Registration] (1) If the center in the axial direction of the shaft that holds the engraved character ring between the arms of the U-shaped head body is approximately the same as the inner diameter of the axial center of the character ring. An engraving head that tapers toward both ends. (2) The stamping head according to claim 1 of the utility model registration claim, wherein the axial center of the shaft is substantially the same as the inner diameter of the shaft hole of the stamped character ring, and the cross section tapers into an arc shape toward both ends. . (3) The center of the shaft in the axial direction is approximately the same as the inner diameter of the shaft hole of the engraved character ring, and the shaft tapers linearly toward both ends.
Head for engraving as described in section.