JPH088000Y2 - Crossbar shift device for transfer feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a crossbar shift device for a transfer feeder, which shifts the crossbar as the slide descends in order to avoid interference with the upper mold.

[Conventional technology]

Conventionally, transfer presses are equipped with transfer feeders that carry work in and out of each processing station.

Further, in the transfer feeder, a plurality of crossbars are provided horizontally between transfer bars arranged in parallel in the feed direction, and a work holding means such as a vacuum cup is provided on these crossbars to perform a two-dimensional operation of the transfer bar. In some cases, the work is held by the work holding means.

In the transfer feeder as described above, the cross bar b moves as shown by the trajectory a shown in FIG. 6, the work c is carried into the processing position d, and then the slide e descends and the cross f as shown by the trajectory f. The bar b returns, and the bar is temporarily saved at the position indicated by g.

Therefore, in the conventional transfer feeder, when the length of the arm i of the work holding means h provided on the crossbar b is increased, the stand-by work holding means h interferes with the upper die or the slide e descending together with the slide e. The distance A between the work holding means h could not be increased.

As a result, when a large-sized work c is adsorbed as shown in FIG. 7, the end of the work c hangs downward, the adsorbing force of the work holding means h is reduced, and a suction error occurs.
There was a problem that the work c could not be carried in smoothly because it drooped or the end of the work c interfered with the lower mold.

In order to improve the above-mentioned inconvenience, a crossbar shift device has been filed in which a segment cam is rotated by a plate cam to shift the crossbar to the upstream side to prevent the work from interfering with the upper die (for example, Jindaihei 1-1108
No. 33).

However, in the crossbar shift device of the above means, since the roller provided in the segment gear is constantly in pressure contact with the plate cam, the segment gear is rotated by the plate cam even in the advance process, and the crossbar acceleration increases,
As a result, there is a problem that the conveyance of the work becomes unstable.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a crossbar shift device for a transfer feeder in which the stability of a work being conveyed is improved.

[Means and Actions for Solving the Problems]

In order to achieve the above object, the present invention provides a carrier movably in a feed direction on a lift beam that is vertically movable by a lift mechanism, and a cross bar is horizontally installed between carriers facing each other. In a transfer feeder in which a plurality of work holding means is provided on these crossbars via arms, a subcarrier is provided on a carrier provided on the upstream side so as to be movable in the feed direction, and the subcarrier is laid in the feed direction. And a shift mechanism including a segmented cam that is rotated by the cam surface of the segmented cam via rollers and a transmission unit that transmits the rotation of the segmented gear to the sub-carrier, while shifting to the upstream side during the return process. , The air cylinder connected to the sub-carrier moves the sub-carrier to the downstream side during the advance process. By energizing, it is obtained so as to disengage the roller from the cam surface of the plate cam.

As a result, there is no influence of the plate cam during advancement, so that the work can be conveyed in a stable state.

〔Example〕

 The invention will be described in detail with reference to the drawings.

In the figure, reference numeral 1 denotes a press body, and a plurality of bolsters 2 are installed on a bed 1a, and a lower die 3 is placed on each of the processing stations W ₁ , W _2, ... On the bolster 2.

A slide 4 is provided above each bolster 2 so as to be vertically movable, and a work 6 is molded between an upper die 5 and a lower die 3 attached to the lower surface of the slide 4. ing.

On the other hand, 7 in the figure is a pair of lift beams arranged in parallel in the feed direction A, and is divided into an upstream side 7 ₁ and a downstream side 7 ₂ for each bolster 2 and the lower part of each lift beam 7 ₁ , 7 ₂ . Are supported by the lift mechanism 8.

A plurality of carriers 10 connected to each other by a transfer bar 9 are provided on the upper surfaces of the lift beams 7 ₁ and 7 ₂ .

These carriers 10 have rollers 12 which roll on guide rails 11 laid on the lift beam 7 in the lower part, are movable in the feed direction A along the guide rails 11, and each carrier 10 Tilt mechanism 13 on top
Are installed, crossbars 14 are laterally installed between the tilt mechanisms 13 facing each other, and a plurality of arms 15a are provided on these crossbars 14 at intervals in the longitudinal direction.

A work holding means 15 such as a vacuum cup is attached to the ends of these arms 15a.

On the other hand, of the above-mentioned crossbars 14, the crossbar 14 which is horizontally mounted between the upstream transfer bars 7 ₁ can be shifted by the shift mechanism 30.

In the shift mechanism 30, a sub-carrier 32 is supported by a guide rail 31 laid on the carrier 10 so as to be movable in the feed direction A, and the cross bar 14 is attached to the sub-carrier 32.
The tilt mechanism 13 is provided.

A rack 33 is laid on the bottom of the subcarrier 32, and a pinion 34 is meshed with the rack 33 to form a pinion.
The gear train 34 is meshed with a segment gear 36 formed in a fan shape via a gear train 35.

The segment gear 36 is fixed to a rotary shaft 37 rotatably supported on the carrier 10, and the base end of a lever 38 is also fixed to the rotary shaft 37. A roller provided at the tip of the lever 38. 39 is pressed against the cam surface 40a of the plate cam 40 from above.

The cam surface 40a of the plate cam 40 has a substantially valley shape,
It is the highest part advance end and return end on both ends, and the center lowest part is the middle return.

Further, a tip end of a piston rod 41a of an air cylinder 41 provided on the carrier 10 side is connected to the sub carrier 30, and the roller 39 is mounted on the plate cam 40 by the air cylinder 41.
The cam surface 40a is pressed or released.

On the other hand, reference numeral 18 in the drawing denotes a cam box installed on the downstream side in the feed direction A, and accommodates a feed cam 19 and a lift cam 20 which are rotated by the power taken out from the press body 1 by a power take-out device (not shown).

The feed cam 19 and the lift cam 20 are circumferentially contacted with a feed lever 21 and a lift lever 22 whose lower ends are axially supported, and the upper ends of the levers 21 and 22 are moved in the feed direction A as the cams 19 and 20 rotate. While being swung, the upper end of the feed lever 21 is connected to a feed carrier 24 via a link 23, and the feed carrier 24 and the most downstream carrier 10 are connected by a connecting rod 25.

The carrier 1 provided upstream the lift beam 7 ₁
0 and the carrier 10 provided on the most upstream side of the downstream lift beam 7 ₂ are connected by another connecting rod 26, and as the lift lever 21 swings, each lift beam 7 ₁ , 7 ₂
The carrier 10 is adapted to be moved at the same time.

Further, one end of a connecting rod 28 is connected to the upper end of the lift lever 22.

The other end of the connecting rod 28 extends upstream along the lift beam 7 and is connected to each lift mechanism 8,
The lift mechanism 8 is driven.

The operation will be described below. The feed cam 19 and the lift cam 20 provided in the cam box 18 swing the feed lever 21 and the lift lever 22 to move the lift beam 7 up and down, and the transfer bar 9 causes the lift beam 7 to move.
The work 6 which has been double-moved upward in the feed direction and carried in from the upstream side is sequentially carried to the processing stations W ₁ , W _2, ...

When the transfer of the work 6 is completed, each carrier 10 starts returning, but the sub-carrier 32 provided in the lift beam 7 ₁ on the upstream side returns and the shift mechanism 30.
Will shift to the upstream side as follows.

That is supplied air to the rod side 41 ₁ of the air cylinder 41 shown in FIG. 5 (b) together with the return start, thereby for subcarrier 32 is towed to the upstream side, the segment gear 36 and the lever which rotates together 38 is biased counterclockwise, and the roller 39 is pressed against the cam surface 40a of the plate cam 40 from above.

Then, as the carrier 10 moves upstream, the roller 39
Moves toward the lowest side of the cam surface 40a, the segment gear 36 is also rotated in the counterclockwise direction accordingly, and the rotation of the segment gear 36 is transmitted to the pinion 34 via the gear train 35. The sub carrier 32 is shifted to the upstream side through the rack 33 meshed with the gear 33 and reaches the middle return position.

As a result, when the carrier 10 reaches the middle return position, the subcarrier 32 is further shifted by S'to the upstream side as shown in FIG.

When the return process is further started from the middle return position, the cam surface 40a of the plate cam 40 rotates the lever 38 in the clockwise direction, so that the subcarrier 32 is shifted downstream and returned to its original position.

On the other hand, when the advance process is started again from the return end, air is supplied to the bottom side 41 ₂ of the air cylinder 41.

As a result, the sub carrier 32 is shifted further downstream until it comes into contact with the stopper 43, so that the roller 39 at the tip of the lever 38 is disengaged upward from the cam surface 40a of the plate cam 40.

Since the carrier 10 is advanced in this state, the sub-carrier 32 is not shifted with respect to the carrier 10 in the advance process, and is not affected by the plate cam 40.

[Effect of device]

As described in detail above, the present invention provides a shift mechanism on the carrier that is double-moved in the feed direction along the lift beam to shift the crossbar supported on the carrier when the carrier returns to the upstream side. By doing so, the length of the arm that supports the work holding means can be increased by the shift amount.

As a result, the distance between the work holding means can be made larger than that of the conventional one, so that even if a large work is picked up, the end of the work does not hang down. It is possible to solve the problem that the lowered work and the lower die interfere with each other and the smooth carry-in of the work is hindered.

Also, during advancement, the roller is disengaged from the plate cam so that the crossbar carrier is not shifted by the plate cam, so the crossbar acceleration does not increase under the influence of the plate cam. The work can be transported with.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is an overall plan view, Fig. 2 is the same front view, Fig. 3 is a view taken along the line III-III in Fig. 2, and Fig. 4 is FIGS. 5 (a) and 5 (b) are explanatory views of the operation of the shift mechanism, and FIGS. 6 and 7 are conventional explanatory views. 7 is a lift beam, 8 is a lift mechanism, 10 is a carrier, 14
Is a crossbar, 15 is a work holding means, 15a is an arm, 30
Is a shift mechanism, 32 is a sub carrier, 36 is a segment gear, 39 is a roller, 40 is a plate cam, 40a is a cam surface, 41 is an air cylinder, and A is a feed direction.

Claims (1)

[Scope of utility model registration request] 1. A carrier 10 is provided on a lift beam 7 which can be moved up and down by a lift mechanism 8 so as to be movable in a feed direction A, and a cross bar 14 is provided between the carriers 10 facing each other.
In a transfer feeder in which a plurality of work holding means 15 are provided on these crossbars 14 via arms 15a, a subcarrier 32 movably in the feed direction is provided on the carrier 10 provided on the upstream side. Also, the sub-carrier 32 is provided with a plate cam 40 laid in the feed direction A.
And the shift mechanism 30 including the segment gear 36 rotated by the cam surface 40a of the plate cam 40 via the roller 39 and the transmission means for transmitting the rotation of the segment gear 36 to the sub-carrier 32, the upstream side during the return process. Air cylinder connected to the sub-carrier 32 while shifting to
By urging the sub-carrier 32 toward the downstream side during the advance process by means of 41, the roller surface 39a of the plate cam 40 is rotated by the roller 39.
Crossbar shift device for transfer feeders.