JPH0712491B2 - A coin stamp press with means for guiding the stamp blank in all directions in the press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a coin stamping press according to the preamble of claim 1.

In high-speed coin stamping presses, it is necessary to protect stamped products from damage when the impact value rises and during operation of the press. The marking blank should be correctly abutted against the marking tool from the classifier to the marking range, in the marking range and from this range to the pick-up range or correctly guided between the marking tool and the conveying means after marking.

High-speed stamping presses, on the one hand, require a quick and short stroke of the ram and, on the other hand, require rapid replacement of the stamped product with the stamped product and the stamped blank.

(Prior Art) From the German patent specification 2346810 a coin stamping press is known which comprises a drive acting on the stamping punch, a supply of stamping blanks to the stamping tool and a discharge device for stamping goods. Is. The stamp drive has a torque lever drive with a rotary eccentric wheel, a connecting rod, and two toggle levers pivotally attached to it. The toggle lever is pivotally attached to the mount side via a pivot and drives the ram and the stamp punch during movement of the eccentric. The knockout stroke is performed as part of the stamp stroke of the stamp punch. Since the stamping process precedes the knockout process, the stamped product is knocked out in the remaining strokes of the stamping stroke, so that a sufficient stroke for knockout cannot be obtained, resulting in damage to the stamped product and incomplete knockout.

From the German patent specification 38701 is known a T-lever in the form of a three-arm lever driven by a crankshaft, in which both toggle levers are pivotally spaced axes of triangular levers and one toggle lever is mounted on a pedestal. Pivoted, the other toggle reba is pivoted to the ram. The need for a long stroke in the stamping phase of the ram makes it necessary to stop the machine for workpiece replacement.

From West German patent specification 1627977 there is known a knockout device of a mechanical press, which is provided with a knockout pin on a press ram and a press table, respectively, and since the knockout stroke is performed only by the movement of a connecting rod driven by an eccentric wheel, You cannot increase the knockout stroke.

The drawback of conventional devices is that they are driven by the same drive,
Since it is performed directly without using a connecting rod or the like, if it is attempted to increase both the stamping stroke by the stamping punch and the knockout stroke by the knockout punch, compared to the case where both punches are driven by separate driving devices and synchronized, The movement is abrupt and not smooth, and precise stamping, damage-free ejection of stamped items, and a sufficiently long stroke for knocking out stamped items will result in a very long waiting time before inserting the next stamp blank. What is required, and the knockout stroke is the same eccentric that drives the stamp punch, so that the stroke of the stamp punch cannot be performed during the knockout stroke.

(PROBLEM TO BE SOLVED BY THE INVENTION) The present invention is to create a coin stamping press capable of smoothly and reliably loading a stamping blank into a stamping mold and discharging a stamped product from the mold before and after stamping by a high-speed coin stamping press. Is an issue.

(Means for Solving the Problem) The problem to be solved by the present invention is solved by the constitution of the features of claim 1.

(Purpose of the Invention) In this marking drive device, the front pivot shaft, which makes one cycle of movement from the eccentric wheel through the connecting rod by one rotation of the crankshaft, has a short axis in the direction of the punch center axis with respect to the punch center axis. The relative distance between the eccentric and these pivots is specified so as to displace an elliptical orbit with a major axis in the vertical direction, the minor axis of this ellipse being the anterior pivot axis and hence the punch. Specify the moving distance in the direction of the center axis of the punch, the long axis of the ellipse specifies the moving distance in the vertical direction of the front pivot axis with respect to the punch axis, in which case the stamp blank before reaching the front dead center on the elliptical orbit. There is a long distance that gives sufficient time for the supply of the, the long distance that gives enough time for the ejection of the stamped product after reaching the front dead center, and the drive of the knockout punch is similar. By ram drive However, since the stamping punch is driven via a turning device separately from the driving of the stamping punch, a sufficiently long knockout stroke for knocking out is obtained from the mold of the stamped product by the knockout punch.

(Embodiment) According to FIG. 1, a crankshaft 3 having an eccentric ring 4 for supporting a lever 5 formed as a triangular lever integrally mounted on a base 2 of a coin stamping press 1 is driven by a motor. It is provided. The lever 5 also has a rear link 8 pivotally supported by a pivot shaft 9 fixed to the base 2 so as to be swingable. Similarly, the front pivot shaft 6 pivotally supported by the lever 5 is pivotally supported by the pivot shaft 19 of the ram 12 via the front link 11. The ram 12 faces the marking direction, is movable along the punch center line 15 of the gantry, and has a marking punch 16 at the end opposite to the pivot shaft 19. The stamp punch 16 cooperates with the knockout punch 17 which opposes the stamp punch 16 when the stamp blank 13 is in front of the knockout punch 17. The stamp blank 13 is guided in front of the stamping tool, for example via a supply dish 18, and after stamping the stamped product is discharged from this area. The supply dish 18 is rotatably supported about a shaft 44 and indexed by an indexing drive. The indexing feed can also be performed by a drive device of the press. The feed tray 18 is pivotably mounted in and out of the marking area for tool changes. The means for feeding the marking blanks 13 to the feed tray 18, the means for indexing and the means for knocking out the stamped articles from the feed tray 18 are not shown in detail but are constructed as known. be able to. Engraved position 27 is engraved blank 13
The set position and the marking position of the marking punch 16 are shown. Knockout punch 17 cooperates with knockout push rod 31 which operates in the direction of knockout guided along punch centerline 15 via the turning device. According to FIG. 4, the turning device of the knockout drive device comprises a first two-arm turning lever 20.
20 is supported by a pivot shaft 22 fixed to the pedestal 2. The first end of the two-arm turning lever 20 is pivotally supported on the ram 12 by a pivot shaft 24 and cooperates with the ram 12. The second end of the two-arm turning lever 20 has a pivot shaft 32, and the connecting rod 26 is pivotably supported on the pivot shaft 32. The pivots 22, 24 and 32 are on a central axis 29 common to them. The pedestal-side pivot shaft 22 is located at a position of 1/2 of the total stroke of the ram and on the vertical line with respect to the stroke direction of the ram 12. The pivots 24 and 32 are arranged at unequal distances from the pivot 22 of the two-arm turning lever 20. A second two-arm turning lever 21 is swingably supported on another pivot shaft 23 on the gantry side. The two-arm turning lever 21 has a long groove, and a sliding member 37 is fixed in the long groove so as to be vertically adjustable. The two-arm turning lever 20 is bent to support the fork member 36, which is used to form the pivot 33. A pivot shaft 33 is provided for the fork member 36 so as to abut the free end 28 of the knockout push rod 31.
It is adjustable via. The sliding member 37 is a two-arm turning lever 21.
A screw hole for adjusting the position of the pivot shaft 25 relative to and a pivot shaft 25 for the forked end of the connecting rod 26.
As a result, a slight gap between the stamp punch 16 and the knockout punch 17 for supporting the stamp blank 13 is adjusted, and the stamp blank 13 between both punches is carried out by the knockout punch 17 from the gap after stamping. It For this purpose, it is necessary to stop the stamp punch 16 together with the ram 12 within the range of the rear dead center Th of the ram 12. At that time, the driving of the ram 12 is not interrupted.

Such a possibility is shown in FIGS. 2 and 3. These figures show the marking phase of the marking product, which depends in particular on the rotational movement of the eccentric wheel 4. The pivot shaft 9 fixed to the gantry 2 is the punch center line
It is located on the opposite side of the crankshaft 3 with respect to 15.
The rear link 8 having the rear pivot shaft 7 pivotally supported at one end describes a circular orbit around the pivot shaft 9 fixed to the pedestal, the radius of curvature being the length of the rear link 8. The distance from the center of the rear pivot shaft 7 to the center of the eccentric ring 4 is measured on the line connecting the center of the eccentric ring 4 and the center of the rear pivot shaft 7, and the center of the eccentric ring 4 is punched. It is set to be larger than the maximum distance to the intersection with 15. The distance from the center of the front pivot shaft 6 to the center of the rear pivot shaft 7 and the distance from the center of the front pivot shaft 6 to the center of the eccentric ring 4 are such that
When occupying the position corresponding to the front dead center Tv of, the center of the front pivot shaft 6 is always set on the side to which the pivot shaft 9 fixed to the gantry belongs with respect to the punch center line 15. Lamb
At the position of the eccentric ring 4 corresponding to the rear dead center Th of 12, the center of the front pivot shaft 6 is located on the crankshaft 3 side with respect to the punch center line 15 (FIG. 2). In this way, the distance from the center of the front pivot shaft 6 to the center of the rear pivot shaft 7 and the distance from the center of the front pivot shaft 6 to the center of the eccentric ring 4 are specified. As a result, the rear link 8, lever 10,
By setting the length of the lever 5 and the positions of the centers of the eccentric ring 4 and the pivots 6 and 7, an elliptical orbit as a transition locus of the front pivot 6 is obtained. According to FIG. 3, in the elliptical orbit, the range from the point 41 to the point 40 and the range from the point 42 to the point 39 is a circular portion 43 with a constant radius of curvature.
43 extends across the punch centerline 15 (second
(Fig. 3, Fig. 3). The ram is on the left circular part 43 in FIG.
There are twelve front dead points Tv, and in the region of this circular portion 43 the pivot axis 6, and thus the ram 12, is braked or accelerated before and after the front dead center Tv to perform the forward / backward movement. In FIG. 3, there is a rear dead center Th of the pivot shaft 6 in the right circular portion 43, and as a result, the pivot shaft 6 is in the right circular portion 43 (from point 42 to point 39 in FIG. 3). The ram 12 does not move forwards or backwards in the direction of the punch center axis 15 and therefore does not change its position during its travel (range), so that during this time the transfer mechanism, the exchanging, removing and inserting of the stamped product by means of the supply pan 18 is carried out. Get enough time for. The forward / backward movement of the ram 12 in the direction of the central axis 15 of the punch is the points 39 to 41 adjacent to the front and rear of the circular portion on the elliptical orbit.
And in the transition range from point 40 to point 42. Point 39
From the point to the point 41, the movement of the pivot shaft 6 is accelerated, and from the point 40 to the point 42, the movement of the pivot shaft 6 is decelerated. At point 39, the ram 12 starts to accelerate,
At that time, stamp blank 16 for stamping tool by stamping punch 16
Is carried out, and the acceleration phase substantially ends at point 41. Forward dead center
The stamped product stamped with Tv, for example, coins or medals, is taken up by the supply dish 18 after passing through the front dead center Tv. The delivery of the stamped product to the supply dish 18 takes place during the gentle movement of the ram 12 up to the point 42. The displacement of the front pivot shaft 6 pivotally attached to the ram 12 via the rear link 11 is carried along with the ram 12 along the closed circular portion 43, and the knockout punch 17 causes at least the return movement of the ram 12. Through a turning device in the direction of knockout action, the stamped product is guided by a stamping punch 16 and a knockout punch 17.

FIG. 5 shows another embodiment of the turning device of the knockout driving device in the coin stamping press according to the present invention. Knockout punch 17 via a vertical adjustment device 35 which is an engaging member.
Contacting the free end 28 of the arm and as shown in FIG.
21 is urged by a connecting rod 45, and the connecting rod 45 is pivotally supported by a control lever 50 via a pivot shaft 46. The control lever 50 is rotatable about a pivot shaft 51 and abuts against a control cam 52 by a control roller 47 via a power storage device (not shown), and the control cam 52 is a cam curve 53 for adjusting the connecting rod 45. Have.
The control cam 52 is rotatably mounted and is driven by a drive disc 48 which is connected to a ram drive via a belt drive 49. The control cam 52 serves to control the knockout movement of the knockout punch 17 synchronized with the ram return movement.

(Effects of the Invention) The displacement trajectory of the pivot shaft pivotally supported by the ram driven by the ram drive device is specified, and the stamp blank is supplied to the stamping tool, loaded, stamped, and stamped during one revolution of the crankshaft. The phase for ejection is specified, in which case the ejection of the stamped product is carried out by the ram drive via the turning device separately from the stamping punch drive, so that the necessary and sufficient working time corresponding to each function is achieved. That is, the stamping punch 12 is almost stopped in the rear position between the ejection of the stamped product and the loading of the next stamping blank into the stamping tool, and the stamped punch 12 is braked to the necessary and sufficient extent. Precise marking is performed by the marking stroke, and knocking out of the marking product by necessary and sufficient stroke, that is, discharging of the marking product without damage is performed.

[Brief description of drawings]

1 is a partial view of a coin stamping press equipped with a ram drive, FIG. 2 is a drive phase diagram of an eccentric wheel / lever mechanism for stamping and knocking out strokes of a ram, and FIG. 3 is a part III of FIG. FIG. 4 shows an enlarged view of the displacement trajectory of the pivot shaft in front of the vehicle, and FIGS. 4 and 5 show the drive device for the knockout punch. In the figure, reference numeral 2 ... Stand 3 ... Crank shaft 4 ... Eccentric wheel 5 ... Lever 6 ... Front pivot shaft 7 ... Rear pivot shaft 8 ... Rear crank 9 ... Fixed to the stand Pivot 11 …… Front link 12 …… Ram 13 …… Stamp blank 15 …… Punch center axis 16 …… Stamp punch 17 …… Knockout punch 18 …… Stamp blank supply and discharge device Th …… Rear dead center Tv …… forward dead point

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Gujüntel Rie Diesel Eislingen Adlerstraße 52, Federal Republic of Germany 52 (72) Inventor Karl Toudium, Wesienbeuren Efel, Federal Republic of Germany -Fau biuren-straße 16 (56) Reference JP-A-50-118378 (JP, A) Actually developed JP-A-54-17567 (JP, U) US Patent 3661008 (US, A)

Claims (6)

[Claims] 1. A stamping drive for a ram (12) and a stamping punch (16), and a partially flexible knockout punch (17) capable of counteracting the ram when a stamping blank is inserted. , A knockout punch drive for knockout, and a device (18) for supplying a stamping blank (13) and for discharging the stamped product after the stamping, the stamping drive comprises a crankshaft ( 3) has a lever (5) driven via an eccentric wheel (4) integral therewith, the lever (5) being pivotally attached to the rear link (8) by its rear pivot shaft (7). And a ram through a rear link (8) to the pedestal side by a pivot shaft (9) fixed to the pedestal (2) and through a front link (11) by its front pivot shaft (6). It is pivotally attached to (12) and is fixed to the mount. The shaft (9) is located on the side opposite to the crankshaft (3) with respect to the punch center line (15), and is located between the center of the eccentric ring (4) and the center of the rear pivot shaft (7). Is the maximum distance from the center of the eccentric ring (4) to the intersection with the punch center line (15), measured on the line connecting the center of the eccentric ring (4) and the center of the rear pivot shaft (7). It is set larger than the distance, and at the position of the eccentric ring (4) corresponding to the front dead center (Tv) of the ram (12), the front pivot shaft (6) is mounted on the pedestal with respect to the punch center line (15). Eccentric ring (4) on the side of the fixed pivot (9) and corresponding to the rear dead center (Th) of the ram (12)
In the position of, the front pivot shaft (6) is located on the crankshaft (3) side with respect to the punch center line (15),
The distance from the center of the front pivot axis (6) to the center of the rear pivot axis (7) and the distance from the center of the front pivot axis (6) to the center of the eccentric ring (4) are specified. A coin stamping press characterized by being present. 2. A knockout punch driving device includes a first two-arm turning lever (20) and a second two-arm turning lever (21).
Each of the two-arm turning levers (20, 21) has a pivot shaft (22, 23) on the base (2) side and a connecting rod (26) at one end.
Has a pivot shaft (32, 25) for the ram, and the other end of the first two-arm turning lever (20) has a ram (12) through the pivot shaft (24).
The second end of the second two-arm turning lever (21) is in contact with the free end (28) of the knockout punch (17) opposite to the marking position (27). The currency stamp press described in paragraph. 3. A mount (2) for at least one two-arm turning lever (20, 21) of a turning device of a knockout punch drive.
From the pivot shaft (22, 23) on one side to the pivot shaft (32, 25) at one end of the two-arm turning lever (20, 21) and the pivot shaft on the gantry side (2
The coin stamping press according to claim 1, wherein the distances from the two, 23) to the other ends of the two-arm turning levers (20, 21) are different. 4. The turning device of the knockout punch drive device has a two-arm turning lever (21), and the two-arm turning lever (21) is for a pedestal-side pivot shaft (23) and a connecting rod (45). Pivot axis (2
5) and an engaging member (35) for contacting the knockout punch (17) with the free end (28) opposite to the stamped position (27).
And a control lever (50) rotatably supported around the pivot shaft (51), and the control lever (50) has a connecting rod (45).
Is rotatably supported at an end of the two-arm turning lever (21) opposite to the pivot shaft (25), and the control lever (50) is attached to a crank disk (52) driven by a ram drive. A coin stamping press according to claim 1, comprising a control roller (47) for abutting. 5. A pivot shaft (25) for pivotally attaching a connecting rod (26) to a second two-arm turning lever (21) of a turning device of a knockout punch drive device is fixed to a mount ( 23) is adjustable and the spindle (3
The coin stamping press according to any one of claims 2 to 4, which is lockable to the sliding member (37) via 4). 6. A pivot shaft (22, 22) fixed to the mount of each two-arm turning lever (20, 21) of the turning device of the knockout punch drive device.
23), a pivot shaft (32,
25) and the pivot shafts (24, 33) of the other ends are located on a common central axis (29, 30), and the central axes (29, 30) of the two-arm turning levers (20, 21) are mutual. The coin stamping press according to claim 2, which is parallel to.