JPH0428661Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has a pair of feed bars that can approach and separate in the X-axis direction and can reciprocate in the Y-axis direction. The present invention relates to an improvement in a transfer device for a press machine that can transfer a workpiece clamped by a pair of fingers in at least two dimensions.

[Background technology and its problems]

In order to efficiently operate a press machine, a transfer device is known that transfers a workpiece to be pressed two-dimensionally or three-dimensionally.

A conventional press machine and its transfer device will be explained with reference to FIG. 5. A bed 30, a column 34 facing each other with a bolster 31 on both sides of the bed 30, and a crown 37 provided on the upper side of the column 34. A press machine is formed of a slide 32 which is slidable in the Z-axis direction on a slide guide 33 above the bolster 31, and a drive mechanism 36 that includes a cam, a link lever, etc. housed in a crown 37. There is. There is a clamp-unclamp mechanism for moving the feed bar 20 toward and away from the X-axis direction in order to clamp and unclamp the workpiece, and a lift-down mechanism for moving the feed bar 20 up and down in the Z direction to lift down the workpiece. An advance return mechanism (not shown) that moves the feed bar 20 back and forth in the Y-axis direction on the slide guide 22 in order to advance the workpiece to be processed. is provided. The clamp-unclamp-lift-down mechanism 17 is connected to a drive mechanism 36 via rods 35, 35.
driven by. Here, by switching the workpiece, it is possible to transfer feed in a two-dimensional direction of the X-axis direction and the Y-axis direction or in a three-dimensional direction of the X-axis direction, the Y-axis direction, and the Z-axis direction.

Incidentally, such a multidimensional transfer feed is premised on accurate operation of the clamp/unclamp mechanism in the X-axis direction. Therefore, the entire sequence cannot proceed smoothly unless it is detected whether the fingers (not shown) provided on the feed bar 20 are reliably clamping the workpiece and the clamp signal is derived as an electric signal. I can't do it.

Conventionally, for this purpose, a limit switch attached to the feed bar 20 or finger was used to detect the clamp signal.

However, conventional limit switches have the following problems.

In other words, if the pushing distance of the detector to bring it into contact with the workpiece is large, that is, if the pressing force is large, the detector will push the workpiece when it is released from the finger, and the workpiece will be damaged. There was a problem in that the position of the mold, for example, caused center deviation with respect to the lower mold. This also causes the workpiece to rotate when the workpiece is clamped, resulting in a similar problem. Furthermore, since excessive pressure is applied to the limit switch from the detector side, there is a risk that the limit switch itself may be damaged. on the other hand,
When the pushing distance of the detector is small, that is, when the pressing force is small, there is a problem that a misclamp signal is output even though the sensor is clamped during the transfer feed.

In this way, in order to ensure that the transfer device of a press machine operates in accordance with the processing timing, it is important to be able to reliably detect the clamping state in order to achieve full automation. Setting and adjusting limit switches required a great deal of effort and time. Moreover, from the perspective of a central monitoring system,
The control panel into which the clamp signal from the limit switch is input is installed in a separate location from the movable mechanisms such as the feed bars 20 and 20, so when setting and adjusting the limits, please check the display on the control panel, etc. It was necessary to make adjustments while monitoring the situation, which was inefficient and sometimes required the cooperation of multiple people. Furthermore, when adjusting the limit switch, there was a problem in that it required skill to confirm whether it was clamped or unclamped by the sound of its operation.

[Purpose of invention]

The object of this invention is to eliminate the above-mentioned problems and to provide an excellent transfer device for a press machine with good work efficiency, which allows adjustment of the clamp confirmation means while visually confirming the clamp state on the spot.

[Means and actions for solving problems]

(Means) This invention has a pair of feed bars that can approach and separate in the X-axis direction and can reciprocate in the Y-axis direction, and the workpiece is clamped by a pair of fingers provided on these feed bars. A transfer device for a press machine capable of transferring an object in at least two dimensions, comprising: a rod extending from the feed bar side in the longitudinal direction of the finger; and the workpiece clamped by the finger. a spring that biases the rod toward the workpiece; a switch that operates when the tip of the rod comes into contact with the workpiece and is displaced against the biasing force of the spring; and a switch that operates when the switch is activated. a display means that lights up;
In order to achieve the above object, the apparatus is constructed to include a clamp confirmation means formed from the switch and a case body attached to the feed bar for accommodating the display means.

(Function) Since the present invention has the above configuration, when the fingers of the feed bar are configured to reliably clamp the workpiece at a predetermined position in the X-axis direction, the rod is processed by a pressing force within a predetermined range. When the switch is activated by contacting an object, this can be visually confirmed by the display means, so that the case body can be fixed to the feed bar in an optimal state. Moreover, since a spring is provided to bias the rod, the pushing distance of the rod can be selected as desired, thereby eliminating the inconvenience of rotating the workpiece or issuing a misclamp signal as in the past. It is possible to perform stable and reliable transfeed operation without causing any problems.

〔Example〕

A preferred embodiment of the transfer device for a press machine according to this invention will be described with reference to the drawings.
Components that are the same as those in the conventional example shown in FIG. 5 above will be given the same numbers, and descriptions of press machines and the like will be omitted.

(First Embodiment) This first embodiment is shown in FIGS. 1, 2, and 3. That is, the first embodiment has a pair of feed bars 20, 20 that can approach and leave in the X-axis direction and can reciprocate in the Y-axis direction, similar to that shown in FIG. 5 above. A pair of fingers 2 provided on these feed bars 20, 20
In the transfer device of a press machine, the workpiece 15 clamped by the feed bars 1 and 21 can be transferred in at least two-dimensional directions (X, Y). Fingers 21, 21, . . . having 23, 23, . . . are fixed. Both feed bars 20, 20 slide guides 22, 2
2, 22, 22, and a clamp/unclamp mechanism for moving the feed bars 20, 20 toward and away from each other in the X-axis direction and slide guides 22, 22, 2.
The lift-down mechanism for lifting down in the Z-axis direction via 2 and 22 is a clamp-unclamp-
It is provided integrally with the lift-down mechanism 17 and consists of a pair facing each other in the Y-axis direction in the figure. Further, advance return mechanisms 18, 18 for reciprocating both feed bars 20, 20 in the Y-axis direction on slide guides 22, 22, 22, 22
is provided. Therefore, the workpiece 15 can be transferred and fed in the X, Y and Z axis directions, that is, in three dimensions.

Here, each finger 21, 21, ... is connected to each corresponding feed bar 20, 20 at a position where the workpiece 15, 15, ... can be reliably clamped.
Fixed.

The clamp confirmation means 1 includes a case body 2 having a switch 7 consisting of a movable contact 5 and a fixed contact 6, a coil-shaped lamp 3 as a display means that lights up when the switch 7 is activated, and a case body 2 having a movable contact 5 and a fixed contact 6. A rod 14 extending in the longitudinal direction of the finger 21 which is integrally connected and slidably supported by the guide 13 in the middle, and a rod 14 interposed between the spring receiver 27 of this rod 14 and the guide 13 are processed. It is composed of a spring 26 that is always biased toward the object 15.

Therefore, the tip of the rod 14 is the finger 21,
The case body 2 is fixed to the feed bar 20 via the mounting plate 16 at an optimal position where it can be confirmed by the lighting of the lamp 3 that the case body 2 has come into contact with the workpiece 15 clamped by the case body 21 . In this embodiment, six workpieces 15 can be transferred three-dimensionally at the same time, so six sets of clamp confirmation means 1 are also provided.

Each case body 2, 2, . ... is connected to the power supply for lighting, and the operation of switches 7, 7... is controlled by the control panel 1.
9 side so that it can be detected as a clamp signal.

In the first embodiment configured as described above, when the clamp-unclamp mechanism of the clamp-unclamp-lift-down mechanism 17 is operated and both the feed bars 20, 20 come closest, both fingers 21, 21 are placed on the workpiece. Adjustments are made in advance so that the object 15 can be securely clamped.

At this point, hold the rod 14 and move it toward the left in FIG. 2 against the biasing force of the spring 26 until the tip of the rod 14 can come into contact with the workpiece 15 with a desired pushing distance, that is, with a constant pressure. , push the rod. In this state, while the tip of the rod 14 is in contact with the workpiece 15, the lamp 3 of the case body 2 is
Attach the case body 2 to the mounting plate 1 at the moment when the light turns on.
6 to the feed bar 20. Therefore,
If the clamp confirmation means 1 is set in this way, when the feed bars 20, 20 are once separated and the feed bars 20, 20 are brought close again to clamp the workpiece 15, the tip of the rod 14 will come into contact with the workpiece 15. While doing so, he is pushed back to the left in the figure. When the button is pushed back by a predetermined push distance, the lamp 3 is turned on and the control panel 19 is turned on.
can detect the clamp signal.

According to the first embodiment, a lamp 3 that lights up at the same time as the tip of the rod 14 comes into contact with the workpiece 15 and the switch 7 is activated is provided in the case body 2 together with the switch 7 to form the clamp confirmation means 1. ing. Therefore, the case body 2 can be installed in the optimal position by visually determining the clamping state using the lamp 3 while checking the clamping state, so there is no need to look at the display panel of the control panel 19 as in the conventional case. Adjustment work of the clamp confirmation means 1 can be performed without any trouble. This not only eliminates the need for a plurality of workers and requires skill, but also enables uniform adjustment of each clamp confirmation means 1, thereby dramatically improving work efficiency. Furthermore, in this embodiment, the conventionally used limit switch is not used, but instead, a movable contact 5 provided at the rear end of the rod 14 in the case body 2 and a movable contact 5 facing the movable contact 5 are used. By attaching the case body 2 to the feed bar 20 using the method described above, a spring is applied to the rod 14 in contact with the workpiece 15. Since the movable contact 5 and the fixed contact 6 come into contact when a predetermined pressure (relatively small pressure) from 26 is applied, the workpiece 15 is clamped by the fingers 21 of the two feed bars 20. When detecting this by contact between the movable contact 5 and the fixed contact 6, this detection can be performed without applying an excessive pressing force from the spring 26 to the workpiece 15, and as a result, the rod 14 and the workpiece 15 are abutment of,
It is possible to prevent center shift and rotational displacement of the workpiece 15 when detaching, and also prevent the switch 7 and the rod 1 from occurring.
4 can be prevented from being damaged.

Further, according to this embodiment, since the lamp 3 and the switch 7 as the display means are both provided in the case body 2, maintenance work on these is easy to do, and they can be arranged effectively in a narrow space. can.

Furthermore, during automatic operation, no misclamp signal is generated due to vibrations of the machine, so stable and reliable transfer feed operation is guaranteed from this point of view as well.

In addition, in the transfer device of a press machine provided with this clamp confirmation means 1, all the fingers 21, 21,
It becomes possible to monitor the clamping state of each workpiece 15 with respect to...

(Second Embodiment) This second embodiment is shown in FIG. 4A and is similar to the first embodiment described above.
In the same configuration as the embodiment, a lamp 3 housed in a case body 2 is connected in parallel with a resistor 11 as a clamp confirmation means 1.

According to the second embodiment, not only can the same effects as in the first embodiment be obtained, but also the lamp 3 can be replaced without interrupting the clamp signal.

(Third Embodiment) The third embodiment is shown in FIG. 4B and has the same configuration as the first embodiment, but the lamp 3 housed in the case body 2 is colored red, and when the lamp 3 is in the unclamped state. It is equipped with a green lamp 4 that is turned on.

The lamp 4 is configured to be turned on by a signal from the control panel 19 when the switch 7 is inactive.

According to the third embodiment, in addition to obtaining the same effects as in the first embodiment, the clamp confirmation means 1
It is also possible to determine whether adjustments have not been completed or to monitor the state of excessive machine vibrations during automatic operation.

(Fourth Embodiment) The fourth embodiment is shown in FIG. 4C and has the same configuration as the first embodiment, but the lamp 3 housed in the case body 2 is colored red, and when the lamp 3 is in the unclamped state. A green lamp 4 that is lit is attached,
And the coil 12 connects the auxiliary relay 8 and the auxiliary contacts 9 and 1.
0 and both lamps 3, without going through the control panel 19.
4 can be lit.

According to the fourth embodiment, in addition to obtaining the same effects as the third embodiment, the clamp confirmation means 1
The adjustment, especially the clamp state, can be confirmed more quickly and reliably, so work efficiency can be further improved.

According to the embodiments described above, the position at which the case body 2 of the clamp confirmation means 1 is attached to the feed bar 20 is adjusted, but the length of the rod 14 is also made variable, either in conjunction with this or independently. Good too.

Further, the lamps 3 and 4 may be light emitting diodes or the like instead of the coil type.

[Effects of the invention] This invention allows for the selection of an arbitrary pushing distance and is also equipped with an integrated display means that allows visual judgment of the clamp status on the spot, thereby dramatically improving the adjustment work efficiency of the clamp confirmation means. This has the excellent effect of ensuring stable and reliable transfer feed operation.

[Brief explanation of drawings]

1 is a plan view showing a first embodiment of a transfer device for a press machine according to the present invention; FIG. 2 is a side sectional view taken along the − arrow line in FIG. 1;
The figure is also an explanatory diagram of the configuration of the switch etc. of the first embodiment, and FIG. C shows the third embodiment, C shows the fourth embodiment, and FIG. 5 is an overall view showing a conventional press machine and transfer device. 1... Clamp confirmation means, 2... Case body,
3...Lamp, 7...Switch, 15...Working object, 19...Control panel, 20...Field bar, 2
1...Finger, 26...Spring, 27...Spring receiver.

Claims (1)

[Claims for Utility Model Registration] A pair of feed bars that can be approached and separated in the X-axis direction and reciprocated in the Y-axis direction, and clamped by a pair of fingers provided on these feed bars. In a transfer device of a press machine that transfers a workpiece, the finger extends from the feed bar side in the longitudinal direction of the finger and is guided by a guide provided on the feed bar so as to be able to reciprocate in the longitudinal direction. a spring that is interposed between the guide and a spring receiver provided on the rod and biases the rod forward toward the workpiece clamped by the fingers; a switch that operates when the rod retreats against the biasing force of the spring due to the tip of the rod coming into contact with the workpiece; a display means that lights up when the switch is operated; and the switch and the display. a case body attached to the feed bar for accommodating the clamp confirmation means; the switch includes a movable contact provided at the rear end of the rod within the case body; and fixed contacts fixedly arranged in the case body to face each other. A transfer device for a press machine, characterized in that the transfer device is attached to the feed bar at a position where the movable contact and the fixed contact come into contact when actuated.