JPH06515U - Marking tool - Google Patents

Abstract

(57) [Abstract] [Purpose] Even if the plate thickness of the processed product is changed, the optimum pressing force for marking can always be obtained without complicated adjustment. [Composition] One of a plurality of markings 23 is formed by a cam 27.
Project from the bottom surface of the marking tool 12. Lamb 1
When 0 is lowered, the tip of the protruding marking 23 is processed 15
The stamping is almost completed by the penetrating force of the punch holder 16. When the ram 10 further descends, the tongue 13 and the bolt 19 are resisted against the spring force of the coil spring 20.
Displaces downward together with. Since the coil spring 20 has a small spring coefficient, even if the ram 10 descends, only the tongue 13 and the bolt 19 descend, and almost no force acts on the punch holder 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a marking tool, and more particularly to an improved structure for marking a work piece.

[0002]

[Prior art]

 A conventional marking tool will be described with reference to FIG. A tongue 42 of a marking tool 41 is connected to a ram 40 of the press. A die 43 is located below the marking tool 41, and a plate-shaped processed product 44 imprinted by the marking tool 41 is placed on the die 43.

The tongue 42 is slidably inserted into an insertion hole 46 that penetrates the center of the punch holder 45. A bolt 47 is inserted from below the insertion hole 46 and is screwed to the tongue 42. The tongue 42 and the bolt 47 are biased upward by the coil spring 48 with respect to the punch holder 45.

At the bottom of the punch holder 45, a stamp holding ring 49 rotatable about the axis B of the punch holder 45 is provided. The stamp holding ring 49 holds a plurality of stamps 50 that can project from the bottom of the ring on the circumference around the axis B. Each stamp 50 is held by a urethane 51 having elasticity. A ball 53 is arranged in the cam hole 52 above each marking 50.

The press member 55 having the cam 54 inserted into the cam hole 52 is supported by urethane 56 having elasticity so as to be relatively displaceable with respect to the punch holder 45. A shim 57 is provided at the upper end of the pressing member 55, and a shaft 58 is slidably inserted into a sliding hole 55 a formed in the pressing member 55. A coil spring 59 is arranged between the press member 55 and the flange member 58b of the shaft 58, and the shaft 58 is biased upward. A shim 60 is arranged on the head 58 a of the shaft 58, and the amount of protrusion of the shaft head 58 a from the upper surface of the punch holder 45 can be adjusted by the thickness of the shim 60.

A plate retainer 61 is provided at the bottom of the marking tool 41. When the ram 40 descends and the plate retainer 61 contacts the workpiece 44, the punch holder 45 does not descend further. When the ram 40 further descends, the tongue 42 and the bolt 47 are displaced downward against the spring force of the coil spring 48. When the lower surface of the ram 40 comes into contact with the shaft head 58a, the shaft 58 descends against the spring force of the coil spring 59, and when the shaft flange 58b comes into contact with the shim 57, the press member 55 is displaced downward. To do. As a result, the cam 54 projects the marking 50 downward through the ball 53 and presses it against the workpiece 44, and the marking is made. When the ram 40 rises, the stamp 50 and the pressing member 55 are displaced upward by the elastic force of the urethanes 51 and 56, respectively.

[0007]

[Problems to be solved by the device]

 In this marking tool 41, assuming that the stroke of the ram 40 is constant, the protrusion amount of the marking 50, that is, the pressing force at the time of marking changes according to the plate thickness of the processed product 44. That is, as the plate thickness of the processed product 44 increases, the protrusion amount of the marking 50 increases and the pressing force increases. For this reason, printing cannot always be performed with the optimum pressing force.

Therefore, even if the thicknesses of the shims 57 and 60 are changed according to the thickness of the processed product 44 to change the thickness of the processed product 44, the protrusion amount of the marking 50 is kept substantially constant and the optimum pressing force is obtained. Can be considered.

However, it is complicated to replace the shims 57 and 60 with the optimum plate thickness according to the plate thickness of the processed product 44, and particularly to replace the shim 57 in the punch holder 45. Further, since the gap between the lower surface of the ram 40 and the shaft head portion 58a is narrow, there is a limit in increasing the thickness of the shim 60.

The present invention provides a marking tool that can always obtain an optimum pressing force for marking, without complicated thickness adjustment of the shim even if the thickness of the material to be stamped is changed. Is intended.

[0011]

[Means for Solving the Problems]

 The marking tool according to the present invention is capable of descending together with the first member connected to the ram of the press, the first member, and the relative displacement in the moving direction of the ram with respect to the first member, and the plurality of tools at the lower end. The marking tool is provided so that it can be selectively projected, and the marking tool descends when the ram descends, and the marking abuts the material to be engraved by the inertia force of the second member. It is characterized by that.

[0012]

[Action]

 The lowering of the ram lowers the second member along with the first member. The penetrating force of the second member when the marking comes into contact with the stamped material causes the stamped material to be stamped. When the ram further descends after the stamp comes into contact with the stamped material, the first member is displaced relative to the second member.

[0013]

【Example】

 The present invention will be described below with reference to examples. Referring to FIG. 1, an upper portion 13a of a substantially cylindrical tongue 13 of a marking tool 12 is inserted in a stepped groove 11 formed in a bottom portion of a ram 10 of a press. The tongue upper portion 13a is formed as an enlarged step portion and is locked by the step portion of the stepped groove 11. A die 14 is located below the marking tool 12, and a plate-shaped processed product 15 to be engraved by the marking tool 12 is placed on the die 14.

The lower part of the tongue 13 is slidably inserted along the axis A of the insertion hole 17 into the insertion hole 17 penetrating the center of the punch holder 16, and the tongue 13 is pressed by the key 18. It does not rotate with respect to the punch holder 16. The bolt 19 is inserted from below the insertion hole 17, and the upper end of the bolt 19 is screwed into the bolt hole 13b formed in the tongue 13. The tongue 13 is biased upward with respect to the punch holder 16 by the coil spring 20 arranged in the insertion hole 17, whereby the head 19a of the bolt 19 is stepped in the insertion hole 17. It is locked to 17a. The lower end of the insertion hole 17 is closed by a closing plate 21.

Referring to FIGS. 1 and 2, the punch holder 16 is provided at the bottom thereof with an annular marking holding ring 22 rotatable about an axis A. The stamp holding ring 22 holds a plurality of stamps 23 that can project from the bottom of the stamp holding ring 22 on the circumference around the axis A. The side peripheral surface of each marking 23 is held by an elastic urethane 24, and a ball 26 placed in a cam hole 25 formed in the marking holding ring 22 is placed on the top of each marking 23. ing.

A single cam 27 that is inserted into the cam hole 25 is fixedly arranged on the bottom surface of the punch holder 16 that faces the top surface of the stamp holding ring 22. When the cam 27 is inserted into the cam hole 25, the marking 23 is lowered via the ball 26 against the elastic force of the urethane 24, and the tip of the marking 23 projects from the bottom surface of the marking tool 12. When the stamp holding ring 22 rotates and the cam 27 comes out of the cam hole 25, the stamp 23 is lifted by the elastic force of the urethane 24 and is housed in the stamp holding ring 22.

Next, the marking operation will be described with reference to FIG. When the ram 10 descends and the tip of the marking 23 protruding from the bottom surface of the marking tool 12 hits the upper surface of the workpiece 15, the marking is almost completed. The marking is performed by a penetrating force determined by almost the total weight of the marking tool 12 and the descending speed of the marking tool 12. Therefore, if the total weight and the descending speed of the marking tool 12 are set to optimum values, optimum marking can be performed regardless of the plate thickness of the workpiece 15.

When the ram 10 descends even after the tip of the stamp 23 hits the upper surface of the work piece 15, the tongue 13 and the bolt 19 are integrated and directed downward against the spring force of the coil spring 20. Displace. Since the spring coefficient of the coil spring 20 is set to a small value, even if the ram 10 descends, only the tongue 13 and the bolt 19 descend, and almost no force acts on the punch holder 16. Therefore, after the tip of the marking 23 first hits the upper surface of the workpiece 15, the marking is not performed by the descending of the ram 10.

As described above, according to the present embodiment, even if the plate thickness of the processed product 15 is changed, the optimum pressing force for engraving can be achieved without the need for complicated plate thickness adjustment of shims as in the conventional case. Can always be obtained.

The coil spring 20 is for securely engaging the tongue 13 and the bolt 19 with the punch holder 16, and is not always necessary.

[0021]

[Effect of device]

 As described above, according to the present invention, even if the plate thickness of the material to be engraved is changed, the optimum pressing force for engraving can always be obtained without the complicated thickness adjustment of the shim as in the past. The effect that can be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of a marking tool of the present invention.

2 is a schematic diagram showing an engraved retaining ring of the marking tool of FIG. 1. FIG.

FIG. 3 is a partial cross-sectional view of a conventional marking tool.

[Explanation of symbols]

 10 Ram 12 Marking tool 13 Tongue 15 Processed product 16 Punch holder 23 Engraved

Claims (1)

[Scope of utility model registration request] 1. A first member connected to a ram of a press,
A second member that can be lowered together with the first member and that can be displaced relative to the first member in the moving direction of the ram; The marking tool descends when it descends, and the marking comes into contact with the material to be engraved by the inertial force of the second member to engrave.