JPH0241840A - Work transfer device - Google Patents

Abstract

PURPOSE:To enable horizontal and vertical movements by a single driving means by interposing the 1st ad 2nd links making a transfer member movable horizontally and vertically on the base provided with the cam groove having the straight line part parallel to the work transfer direction and an inclination part and a driving link between the both links. CONSTITUTION:A cam groove 3 consisting of the straight line part 3a parallel to a work transfer direction and the inclination parts 3b, 3c to the lower part linking to the both ends thereof is provided on the side face of a base 2. The guide parts 51, 52 of the support member 50 detaching a work and fixing a transfer member are fitted freely slidably to the guide shafts 43, 44 which move the horizontal support shaft 4 located on this base 2 freely slidably. Moreover, the arms 14, 24 of the 1st, 2nd links 10, 20 moving the cam groove 3 are engaged with a pair of the pins 53, 54 erected on the side face of the guide parts 51, 52. The both links are moved by linking by interposing the driving link 30 interlocking with a single driving means 33 between these both links, the transfer member is moved horizontally at the horizontal part of the cam groove 3 and it is moved vertically at the inclination part.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a workpiece conveyance device that conveys a workpiece along a predetermined trajectory, and in particular, it is capable of performing six horizontal movements and eight vertical movements of a conveyance member by a single driving means. Concerning the conveyance device.

[Prior Art] In order to supply workpieces to a press machine, workpiece conveyance devices are usually arranged side by side. For example, when press working is performed by continuously supplying sheet steel plates, or when performing press working in multiple steps at the same time, it is necessary to transport the workpiece and place it in a predetermined position in synchronization with the operation of the press machine. Various conveyance devices are used. This type of well-known conveying device is configured such that a conveying member including a detachable member such as a vacuum cup or an electromagnet, or an engaging member such as a hook is driven by an electric motor or the like and moves along a predetermined trajectory. Then, the position of the workpiece is electrically detected and the electric motor etc. are controlled in accordance with the detection signal so that the workpiece is transported in synchronization with the operation of the press machine.

With the above-mentioned conveyance device, there is a problem that the timing of the operation of the press machine is misaligned due to noise, etc. To solve this problem, a conveyance device that is linked to the drive shaft of the press machine has been proposed. . For example, as described in Japanese Utility Model Application Publication No. 62-123325 filed by the present applicant, a camshaft connected to the crankshaft of a press machine is rotationally driven as the crankshaft rotates, and the camshaft There is an apparatus in which a conveying member is driven via a coupling mechanism by a cam member that rotates together with the transport member. Since this device is driven in synchronization with the press machine, it not only eliminates the above-mentioned timing deviation, but also has various advantages.

[Problems to be Solved by the Invention] However, in the above-mentioned conveyance device, a feed bar is provided as a specific aspect of the conveying member, and two levers driven by two cam members are provided as a specific aspect of the coupling mechanism. It has a complex structure, using a rack and pinion mechanism connected to a lever in the inner tree. In particular, a cam member and a lever are required for horizontal movement and vertical movement of the conveying member, and movement transmitting parts connected to these are also required. Furthermore, since the movement is transmitted by the cam member and the lever, the lever may not be able to follow the movement of the cam member, resulting in so-called cam skipping, and a predetermined conveyance operation may not be obtained.

SUMMARY OF THE INVENTION Accordingly, the present invention relates to a workpiece conveyance device that performs horizontal movement and vertical shifting of a conveyance member, and an object of the present invention is to provide a conveyance device that can be driven by a single drive means and that can reliably perform a predetermined conveyance operation. shall be.

[Means for Solving the Problems] In order to achieve the above object, the present invention adopts the following configuration.

That is, the workpiece conveyance device of the present invention includes a base provided with a positive guide means on the side surface having a straight line portion parallel to the workpiece conveyance direction and a downwardly inclined portion at both ends of the straight line portion; at least one guide member having a support shaft parallel to the straight portion of the positive guide means, a guide shaft slidably supported by the support shaft and extending downward; a support member that is movably supported and extends parallel to the support shaft, and has a pair of pins implanted therein extending in a direction perpendicular to the side surface of the base with a predetermined distance apart; a conveying member for attaching and detaching a work; a first link and a second link that move according to the positive guide means; A first link and a second link each having a pair of pins slidably fitted therein; a drive link interposed between the first link and the second link and rotatably connected to each; and a drive means for driving the drive link in a direction parallel to the support shaft.

[Function] In the workpiece conveying device configured as described above, when the first link and the second link are located in the straight line portion of the positive guide means, a pair of support members are placed at the tops of the elongated holes of the first link and the second link, respectively. When the pins are set to engage, the support member is held at its uppermost position because both elongated holes are mutually inclined downward. The transport member mounted on the support member is therefore also in its uppermost position.

Therefore, when the drive link is driven in a direction parallel to the support shaft by the drive means, the first link and the second link connected thereto are
Link also works in the same direction. Therefore, while the first link and the second link move along the straight portion of the positive guide means, the conveying member is held in its uppermost position and moved in parallel.

When either the first link or the second link enters the inclined portion of the positive guide means, the top of the elongated hole of either link rotates, and the top of the elongated hole of one of the links engages with this elongated hole. The downward component of the force transmitted to the pin acts on the support member to move it downward, and at the same time, the other pin engaged with the elongated hole of the other link moves downward 8 along the slope of the elongated hole. As a result, the support member moves eight times parallel to the support axis to a predetermined lowermost position.

When a workpiece is attached to the conveyance member and the drive link is driven in the opposite direction, the top of the elongated hole of one of the links rotates in the opposite direction, and connects to the support member via one of the pins. While transmitting the rising force, the other pin rises along the slope of the elongated hole of the other link. This results in
The conveyance member is lifted together with the workpiece, and is conveyed horizontally while the first link and the second link move along the straight portion of the positive guide means while being held at the uppermost position.

Then, when the other of the first link and the second link enters the inclined portion of the positive guide means, it moves downward in the same manner as described above, and the workpiece is removed at the lowest position.

After this, the first link and the second link are
The link returns to its initial position.

[Example] Hereinafter, an example of the workpiece conveyance device of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a workpiece conveyance device according to an embodiment of the present invention, which is installed in parallel with a press machine (not shown). This press machine performs two press processes at the same time, for example, by lowering a ram.A workpiece conveying device 1 is installed on the side of the press machine, and the workpiece to be processed is fed onto the bed from the side of the press machine, and is placed in a predetermined position. It is transported according to the process.

FIG. 1 is a front view of the workpiece conveyance device 1 in a plane parallel to the conveyance direction of the workpieces to be supplied to the press machine, and a cam groove 3 is formed in the side surface of the base 2 as shown.

The cam groove 3 has a straight portion 3a parallel to the workpiece conveyance direction, and an inclined portion 3b continuously formed at both ends thereof and inclined downward.
, 3c, and constitute the positive guide means referred to in the present invention.

Incidentally, it is preferable that the cam groove 3 has a U-shaped cross section as shown in FIG.

On the other hand 1. A support shaft 4 is installed above the base 2 in parallel with the straight portion of the cam groove 3. That is, a rod-shaped support shaft 4 is fixed between a fixed part 6 of the press machine and a column 5 that is erected at a certain distance. This support shaft 4 has
A cylindrical guide member 41 having a hollow portion through which the support shaft 4 is inserted.
．． 42 is slidably fitted. Guide member 41.4
2 are each provided with guide shafts 43, 44 extending downward, into which guide portions 51, 52 of the feed bar 50 are slidably fitted.

The feed bar 50, which is a support member referred to in the present invention, is a plate body with cylindrical guide portions 51 and 52 formed at both ends.
As shown in the figure, each guide part 51, 52 has a conveying member 61.6.
2 is fixed. The conveyor members 61,62 have a pair of removable members 65,66 extending in the direction of the press machine. That is, one end of the arm 63 and the other end of the arm 64 are fixed perpendicularly to the side surface of the feed bar 50, and detachable members 65.6 are attached to the other end of the arm 63 and 64, respectively.
In this embodiment, a vacuum cup is used as the 0 attachment/detachment member 65, 66 to which 6 is attached, but other suction devices such as electromagnets or engagement hooks may also be used. In addition, in FIG. 2, the guide portion 52 of the feed bar 50
Since the conveying member 62 fixed to the conveying member 61 overlaps with the conveying member 61, the reference numerals are given in parentheses.

Conveying member 61. of guide portion 51.52 of feed bar 50.
A pair of pins 53 and 54 extending in a direction perpendicular to the side surface of the base 2 are implanted on the surface opposite to the surface on which the base 2 is mounted. Then, the first
A link 10 and a second link 20 are supported on a base 2 so as to be movable six times.

The first link 10 includes a base 11 and an arm 14 integrated therewith.
Rollers 12 and 13 are rotatably provided at both ends of the base 11, and these rollers 12 and 13 are accommodated in the cam groove 3. As shown in FIG. 2, the rollers 12, 13 are formed with a flange, and this flange is accommodated in the cam groove 3 having a U-shaped cross section.
is supported so as not to fall off the side surface of the base 2.

As shown in FIG. 1, the arm 14 of the first link 10 is formed with a straight elongated hole 15 that slopes downward to the right, into which a pin 53 provided on the feed bar 50 can freely slide. They are mated.

Further, the roller 2 provided on the base 21 of the second link 20
2 and 23 are housed in the cam groove 3 like the first link 10, and the feed bar 50 is inserted into the elongated hole 25 formed in the arm 24.
A pin 54 is slidably fitted therein. The elongated hole 25 has a linear shape that is inclined downward to the left in FIG. 1, and therefore the elongated holes 15 and 25 are each inclined downwardly and inwardly. Then, the first link 10 and the second link 20
is in the straight portion 3a of the cam groove 3, the pins 53 and 54 provided on the feed bar 50 are inserted into the elongated holes 15 and 25, respectively.
As shown in FIG. 1, the feed bar 50 is held at its uppermost position.

In addition, the length of the elongated hole 15.25 is the length of the feed bar 50 described later.
It is set according to the required stroke.

Further, the first link 10 and the second link 20 are not limited to the shape shown in FIG. 1, but may be in the form of a plate in which the base 11 and the arm 14 and the base 21 and the arm 24 are integrated, respectively. It may also be configured as follows.

A driving link 3 is provided between the first link 10 and the second link 20.
0 is interposed and rotatably coupled to each of the first link 10 and the second link 20.

That is, one end of the substantially T-shaped plate is supported by the rotating shaft of the roller 13 of the first link 10, and the other end is supported by the rotating shaft of the roller 22 of the second link 20.

The upper end of the drive link 30 is pin-coupled between both ends of a U-shaped joint 31, and one end of a rod 32 is fixed to the center of the joint 31, and the other end of the rod 32 is fixed to a variable stroke cylinder 33. The variable stroke cylinder 33 is a driving means according to the present invention, and is configured to variably drive the eight strokes of the rod 32, and is supported by a column 34.

In the work transfer device 1 having the above configuration, the variable stroke cylinder 33 is driven in synchronization with the operation of the press machine.

Starting from the state in which the drive link 30 is located at the center of the linear portion 3a of the cam groove 3, the rod 32 is first moved to the left in FIG. 1 by driving the variable stroke cylinder 33.

Therefore, the drive link 30 connected by the joint 31 pushes the first link 10, and the first link 10 moves horizontally to the left in FIG. 1 while the rollers 12 and 13 rotate within the cam groove 3. . Similarly, the second link 20 connected to the drive link 30 also moves horizontally in the same direction while the rollers 22 and 23 rotate within the cam groove 3. Therefore, the first link 10
Feed bar 5 supported by pins 53 and 54 engaged at the top of elongated hole 15 of and the top of elongated hole 25 of second link 20
0 maintains its raised position and moves horizontally to the left in FIG. 1, resulting in the state shown in FIG. 1, and therefore the conveying members 61 and 62 fixed to the feed bar 50 move horizontally in the same direction.

When the drive link 30 is further pushed leftward from the state shown in FIG. 1 by the variable stroke cylinder 33, the roller 12 of the first link 10 enters the inclined portion 3b of the cam groove 3. As a result, the arm 14 of the first link 10 rotates and moves counterclockwise around the joint with the base 11, and a rotational force is applied to the pin 53 engaged with the top of the elongated hole 15, which guides the arm 14 of the first link 10. A component force in the direction of the shaft 43 applies a force to the guide portion 51 of the feed bar 50 to cause it to slide downward on the guide shaft 43 . Along with this, the pin 54 on the guide portion 52 side of the feed bar 50 slides downward within the elongated hole 25 of the second link 20, so that the entire feed bar 50 is in a positional relationship parallel to the support shaft 4. Move downward while holding the feed bar 50
The conveying members 61, 62 fixed to are also moved downwards.

FIG. 3 shows a state in which the rod 32 has moved to the left by a predetermined stroke, and in this state, the feed bar 50 and the conveying members 61 and 62 are at their lowest positions. Furthermore, the third
The position indicated by the dashed line in the figure corresponds to the state shown in FIG. 1, and the conveying members 61 and 62 have been lowered by a distance H. At this lowermost position, the attachment/detachment member 65.66 of the conveyance member 61.62
is activated, and a workpiece (not shown) is sucked by the vacuum.

Next, when a force is applied to the rod 32 by the variable stroke cylinder 33 to move it in the right direction in FIG. As the rising force is transmitted,
With this upward movement, a clockwise rotational force is applied to the pin 53 engaged with the top of the elongated hole 15 of the first link 10. As a result, the guide part 51 equipped with the pin 53 moves up the guide shaft 43, and at the same time, the pin 54 provided in the guide part 52 slides inside the elongated hole 25 and moves up. And feed bar 5
0 rises while moving parallel to the support shaft 4 until the pin 54 reaches the top of the elongated hole 25, that is, to the position shown by the dashed line in FIG. Therefore, the workpieces attracted to the transport members 61 and 62 are lifted.

When the rod 32 is further moved to the right, the feed bar 5
0 is held at the uppermost position and moves horizontally until the second link 20 reaches a position symmetrical to the first link 10 in FIG. That is, the workpieces attracted to the transport members 61 and 62 are transported. When the roller 23 enters the inclined portion 3c of the cam groove 3, the arm 24 of the second link 20 rotates and moves clockwise around the joint with the base 21, and moves into the elongated hole 25.
Rotational force is applied to the pin 54 engaged with the top of the guide shaft 4
Forces to move the feed bar 50 downward are applied to the guide portion 52 of the feed bar 50 by force components in four directions. Along with this, the pin 53 on the guide portion 51 side of the feed bar 50 moves downward within the elongated hole 15 of the first link 10, and the conveyance members 61 and 62 fixed to the feed bar 50 move downward a distance HfJ. do.

When the feed bar 50 reaches the lowest position, the rod 32 is stopped, and when the vacuum force is released, the detachable member 85.6
The workpiece is removed from 6 and placed at a predetermined position. Then, when the rod 32 is driven leftward again, the second link 2
0 is transmitted to the inclined portion 3C of the cam groove 3, and in response to the upward movement of the second link 20, a counterclockwise rotational force is applied to the pin 54 engaged with the top of the elongated hole 25 of the second link 20. is added. Therefore, at the same time as the guide part 52 rises, the guide part 51 also rises, and the feed bar 50 moves in parallel and rises to the uppermost position. The leftward movement of the rod 32 causes the feed bar 50 to return to its starting position while being held at the uppermost position.

In the above operation, the first link 10 and the second link 2
0 is supported by the rollers 12, 13 and 22, 23 housed in the cam groove 3, and is configured as a so-called positive cam, so that cam skipping as in conventional mountings does not occur.

In addition, since the feed bar 50 is connected to the feed bar 50 by engagement with the pin 53.54 and the elongated hole 15.25, the connection between the two will not come off. By using , a more reliable connection relationship can be ensured. Therefore, stable conveyance action can be ensured.

The vertical stroke of the conveying members 61 and 62, that is, the third
Since the distance 111iH in the figure can be made variable by adjusting the movement stroke of the rod 32, it can be appropriately set in relation to the press machine to which the workpiece conveyance device 1 is attached.

Further, the horizontal stroke of the conveying members 61 and 62 can also be made variable by expanding and contracting the linear portion 3a of the cam groove 3. For example, the support shaft 4 should have a sufficient length, and the base 2 It is also possible to have a configuration in which the is divided into two parts in the axial direction and the two parts are fitted together, and one part is placed close to or separated from the other as required.

In the above embodiment, a pair of guide members 41 and 42 are provided, but as shown in another embodiment in FIG. It is also possible to configure the guide member 41 to be supported in a cantilever manner by the guide shaft 43 of the guide member 41. In FIG. 4, the same parts as those in the embodiment shown in FIG. Since they are essentially the same, their explanation will be omitted.

In the above-mentioned embodiment, the cam groove 3 is used as the positive guide means, and the positive cam is constituted by the roller 12 etc. accommodated in the cam groove 3, but the present invention is not limited to this, and for example, Instead of the cam groove 3, a rail having a T-shaped cross section may be used, and a trolley having a U-shaped cross section may be placed across the rail. Furthermore, although the above-mentioned embodiment has been described as being placed side by side with a press machine, it can be applied to a wide range of uses as a conveying device that can be moved horizontally and vertically by a single drive means.

[Effects of the Invention] Since the workpiece conveying device of the present invention is configured as described above, it has the following effects.

That is, the driving means in the present invention is single, and the conveyance member is moved horizontally and vertically by simply moving the drive link in a direction parallel to the support shaft, so it is greatly simplified compared to the conventional device. , it is possible to create a small and lightweight workpiece conveyance device. Furthermore, since the conventional combination of a cam member and a lever is not required, and a positive guide means is used, a predetermined movement of the conveying member can be ensured.

Further, by adjusting the movement stroke of the drive link by the drive means, the stroke of the up and down movement of the conveying member can be made variable, so it can be set appropriately depending on the press machine etc. to which it is attached.

[Brief explanation of the drawing]

FIG. 1 is a front view of a workpiece conveyance device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG.
FIG. 4 is a front view showing the operating state of the workpiece conveyance device shown in FIG. 4. FIG. 4 is a front view of the workpiece conveyance device according to another embodiment of the present invention. 1... Workpiece conveyance device, 2... Base. 3... Cam groove (positive guide means), 3a... Straight portion. 3b, 3c... Slanted portion, 4... Support shaft. 10...First link, 15...Elongated hole. 20...Second link, 25...Elongated hole. 30... Drive link. 33...Variable stroke cylinder (driving means). 41.42... Guide member, 43.44... Guide shaft. 50.50a...Feed bar (support member). 53.54... Pin, 61.62... Conveyance member. 63.64...Arm, 65.68...Removable member Patent applicant: Kyoho Seisakusho Co., Ltd.

Claims (1)

[Claims] (1) A base provided with a positive guide means on the side surface having a straight line part parallel to the workpiece conveyance direction and a downwardly inclined part at both ends of the straight part, and a straight line of the positive guide means of the base. at least one guide member having a support shaft parallel to the section, a guide shaft slidably supported on the support shaft and extending downwardly; a support member having a pair of pins extending parallel to the support shaft and extending in a direction perpendicular to the side surface of the base at a predetermined distance; ,
A first link and a second link that move according to the positive guide means.
A first link and a second link, each of which has a straight elongated hole that is inclined downwardly and inwardly, and each of the pair of pins is slidably fitted into the elongated hole. and a drive link interposed between the first link and the second link and rotatably coupled to each, and a drive means for driving the drive link in a direction parallel to the support shaft. Workpiece conveyance device.