JP3652343B2 - Workpiece positioning mechanism of transfer device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a workpiece positioning mechanism of a transport device that transports a workpiece such as an automobile body. More specifically, the present invention can easily cope with different types of workpieces by changing the positioning height of the workpiece. The present invention relates to a workpiece positioning mechanism of a transfer device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, in a hanger of a transport device that transports a work such as an automobile body on a transport rail, a cable and a spring that prevent the work from being displaced by engaging the work in the vicinity of a work receiving portion constituting the hanger. Thus, a positioning pin that can be moved in and out is provided to position the hanger and the workpiece (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Examined Patent Publication No. 5-65391 (pages 2 to 3 and FIG. 3)
[0004]
[Problems to be solved by the invention]
However, in the above-described workpiece positioning mechanism of the transfer device, when positioning a workpiece of a different positioning height on the hanger, the positioning pin itself must be replaced with a pin having a different length each time the workpiece type changes. Therefore, versatility cannot be improved when positioning and processing the workpiece.
[0005]
The present invention has been made to solve the above-described problems, and provides a workpiece positioning mechanism for a transfer device that can easily cope with different types of workpieces by making the workpiece positioning height variable. The purpose is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a workpiece positioning mechanism that is provided in a transport device that transports a workpiece and includes a positioning pin for positioning the workpiece.
A positioning pin main body for positioning the workpiece placed on the transfer device;
A spring member that is provided on the positioning pin main body and relaxes the impact force of the positioning pin main body when the workpiece is placed;
A slide cam having cam surfaces of different heights;
A direction changing member that switches the positioning pin to a different height by engaging with the slide cam and displacing in a direction different from the sliding direction;
And the positioning pin main body moves integrally with the direction changing member to position the workpiece at different height positions with respect to different types of workpieces.
[0007]
In this case, it is preferable that the slide cam has a multistage cam surface that engages with the direction changing member. Moreover, it is preferable that the workpiece positioning mechanism further includes a drive mechanism that is installed at a specific position on the transfer path of the transfer device and that can switch the position of the cam surface of the slide cam.
[0008]
According to the present invention, when the positioning pin main body for positioning the workpiece on the hanger is switched to have a different height, the slide cam is displaced along the sliding direction of the workpiece to engage the direction changing member. As a result, the positioning pin main body that is integrally displaced with the direction changing member rises to reach the upper end position, and the workpiece is positioned at this position. On the other hand, if the slide cam is detached from the direction changing member, the positioning pin body can be lowered and positioned at the lower end position.
[0009]
In addition, if the cam surface of the slide cam is set in stages, the positioning pin body can be positioned at a predetermined stage even if different types of workpieces are placed on the hanger according to the number of stages. In addition, it is possible to efficiently perform a machining operation on the work on the hanger in a short time, and as a result, versatility can be improved.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a workpiece positioning mechanism of a transport apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
[0011]
FIG. 1 is a front view showing a workpiece positioning mechanism 10 of a transport apparatus according to an embodiment of the present invention and a positioning mechanism 24 installed on a transport path, and FIG. 2 is a work positioning of the transport apparatus shown in FIG. 3 is a perspective view of a main part of the mechanism 10. FIG.
[0012]
As shown in FIG. 1, in the workpiece positioning mechanism 10 of the transport apparatus according to the present invention, a body receiving portion 22 is installed on a placement portion (arm member) 16b of an arm 16 located on the left side of a hanger (not shown). A positioning mechanism 24 for preventing the displacement of the vehicle body 14 is disposed inside the body receiving portion 22.
[0013]
Further, the bed 12 installed at a specific position on the transport path is driven to move in the horizontal direction and the vertical direction (arrow C direction, arrow X direction, and arrow Y direction in FIG. 1) to operate the positioning mechanism 24. The mechanism 26 is fixed via a bracket 27.
[0014]
Further, the bed 12 has a front / rear direction stopper 18 (see FIG. 2) for restricting the position of the arm (arm member) 16 on which the vehicle body 14 is placed by a driving source (not shown). 1) is disposed.
[0015]
Furthermore, the bed 12 is provided with a width direction stopper 20 (see FIG. 1) that restricts the position of the arm 16 in the width direction (arrow C direction in FIG. 1) by a drive source (not shown).
[0016]
Reference numeral 31 denotes a displacement device that lowers the positioning mechanism 24, and the displacement device 31 includes an actuator 33, and the actuator 33 is fixed to the bed 12 and is attached to a bracket 31 a that extends above the positioning mechanism 24. It is fixed. The actuator 33 is actually a cylinder that moves back and forth in the up-and-down direction (arrow X direction and arrow Y direction in FIG. 1). A push plate 33 a is attached to the rod tip of the actuator 33.
[0017]
3 and 4 show a schematic structure of the positioning mechanism 24. FIG. A lateral plate 28 is fixed to the side surface (in the direction of arrow C in FIG. 1) of the mounting portion 16b of the arm 16. A set of spaced apart boss portions 28a, 28a are erected on the horizontal plate 28, and shaft pins 30, 30 are slidably inserted into the boss portions 28a, 28a. The connecting plates 32 and 34 are fixed to the upper and lower ends of the shaft pins 30 and 30 by screw members (not shown).
[0018]
A guide member 36 is attached to the horizontal plate 28 along the axial direction thereof, and a switching slide cam (slide cam) 38 is slidably inserted into the guide member 36. A curved end portion of the switching lever 40 is fitted into the concave portion of the switching slide cam 38.
[0019]
The switching slide cam 38 has a tapered surface (cam surface) 38 a at one end thereof, and the direction changing member 42 is fixed to the lower surface 32 a of the connecting plate 32. A taper surface (cam surface) 42 a that faces the taper surface 38 a of the switching slide cam 38 is provided at one end of the direction changing member 42.
[0020]
FIG. 5 shows a partial longitudinal sectional structure of the positioning pin means 44. A stepped cylindrical portion 46 b of the casing 46 is inserted from below into a hole 32 b provided in the connecting plate 32, and the stepped cylindrical portion 46 b is fixed to the connecting plate 32 with a screw member 49 through a spacer 47. ing.
[0021]
A guide sleeve 50 is slidably fitted into the hole 46 a of the casing 46, one end of the spring member 52 disposed in the hole 46 a is seated on the cap 48, and the other end is a hole of the guide sleeve 50. It sits on the end of the part 50a.
[0022]
Therefore, the guide sleeve 50 is always urged upward by the spring member 52 in FIG.
[0023]
Reference numeral 54 denotes a positioning pin body. The shaft portion of the positioning pin body 54 is inserted into the hole 50b of the guide sleeve 50 to have a guide function for the spring member 52, and its conical tip is a vehicle body. 14 (see FIG. 1) is inserted into a hole (not shown).
[0024]
The positioning pin main body 54 is fixed to the guide sleeve 50 by a screw member 56 with a flange 54 a provided around the tip of the positioning pin 54 abutting against one end surface of the guide sleeve 50.
[0025]
The elastic force of the spring member 52 is set to be greater than the weight of the guide sleeve 50 and the positioning pin main body 54, so that the lower end 50 c of the guide sleeve 50 is always on the upper end surface of the hole 46 a of the casing 46. It is in pressure contact.
[0026]
As is apparent from the above configuration, the guide sleeve 50 and the positioning pin main body 54 are always held in a floating state by the elastic force of the spring member 52. In this case, the spring member 52 functions as a cushioning material that alleviates the impact force of the positioning pin body 54 when the positioning pin body 54 comes into contact with the vehicle body 14 and is about to descend.
[0027]
As shown in FIG. 1, an actuator 62 that moves forward and backward in the vertical direction (arrow X direction and arrow Y direction in FIG. 2) of a bracket 27 (see FIG. 1) fixed to the bed 12 is attached. A plate 64 that is curved in an S shape is attached to 62a.
[0028]
An actuator 68 is fixed to the plate body 64, and a moving plate 66 is fixed to a rod 69 extending from the actuator 68. Accordingly, when the actuator 68 is energized, the moving plate 66 moves back and forth in the direction of the arrow AB.
[0029]
The moving plate 66 is provided with a pair of clamp claws 70a and 70b spaced apart by a predetermined distance. The clamp claws 70a and 70b are turned up in a backward direction (in the direction of arrow B in FIG. 2) via cams 72a and 72b that are rotatably attached to the moving plate 66, and the cams 72a and 72b are raised. When the support by the cams 72a and 72b is released by the rotation of the cam, it lies sideways in the forward direction (the direction of arrow A in FIG. 2). The cams 72a and 72b rotate in conjunction with a drive source (not shown).
[0030]
The workpiece positioning mechanism 10 of the transfer apparatus according to the embodiment of the present invention is basically configured as described above. Next, the operation and effect thereof will be described.
[0031]
First, the case where the positioning pin main body 54 is located at the lower end (shown by a solid line in FIG. 4) in the workpiece positioning mechanism 10 of the transfer device according to the embodiment of the present invention will be described.
[0032]
In this case, when the upper end position and the lower end position of the positioning pin main body 54 are detected by a detection device (not shown), it is preferable in relation to other control systems.
[0033]
For example, the actuator 62 is driven after confirming that the positioning pin main body 54 is located at the lower end by a detection device (not shown). As a result, the rod 62a of the actuator 62 is raised and the actuator 68 is raised integrally with the moving plate 66 via the plate body 64 fixed to the rod 62a, and the clamp claws 70a and 70b are moved to the side surface of the switching lever 40. Is displaced upward (in the direction of the arrow X in FIG. 2) to a position facing the.
[0034]
At this time, when the switching lever 40 is displaced along with the movement of the arm 16, the cam 72b is rotated by a drive source (not shown), and the clamp pawl 70b is laid down. This is to avoid interference with the switching lever 40.
[0035]
In this state, the vehicle body 14 placed at a predetermined position of the body receiving portion 22 is conveyed via a rail (not shown), and the arm 16 is stopped in a state where the vehicle body 14 is moved to the predetermined position.
[0036]
Next, under the biasing action of a drive source (not shown), the front / rear direction stopper 18 sandwiches the lower portion 16a of the arm 16, and the position of the arm 16 in the front / rear direction (arrow A direction and B direction in FIG. 2) is restricted. . Furthermore, the position of the arm 16 in the width direction (arrow C direction in FIG. 1) is regulated by pressing the side surface of the mounting portion 16b of the arm 16 by the width direction stopper 20 by a driving source (not shown).
[0037]
For this reason, the position of the arm 16 in the front-rear direction and the width direction is restricted, and the arm 16 is stopped at a predetermined position. In this case, the switching lever 40 is located between the clamp claws 70a and 70b. Therefore, the cams 72a and 72b are rotated under the action of a drive source (not shown), thereby raising the clamp claws 70a and 70b.
[0038]
Next, when the actuator 68 is actuated and the clamp claws 70a and 70b are raised by the moving plate 66 and displaced forward (in the direction of arrow A in FIG. 2), the clamp claws 70b come into contact with the switching lever 40 and the rod The switching lever 40 moves forward (in the direction of arrow A in FIG. 2) by the displacement operation of 69.
[0039]
As a result, the switching slide cam 38 is displaced in the forward direction via the switching lever 40, and the tapered surface 38 a engages with the tapered surface 42 a of the direction changing member 42, and the connecting plate fixed to the direction changing member 42. Raise 32. As a result, the positioning pin body 54 is displaced upward (in the direction of arrow X in FIG. 2) using the shaft pins 30 and 30 as a guide, and reaches the upper end thereof (see the two-dot chain line in FIG. 3).
[0040]
Eventually, the position of the positioning mechanism 24 is switched from the lower end to the upper end, the positioning pin main body 54 of the positioning pin means 44 enters a hole (not shown) of the vehicle body 14 (see FIG. 1), and the vehicle body 14 is in a predetermined position of the arm 16. Installed.
[0041]
Next, a case where the position of the positioning mechanism 24 is switched from the upper end to the lower end will be described.
[0042]
Actuator 68 is activated and rod 69 displaces moving plate 66. Based on this operation, the clamp claws 70 a and 70 b are displaced backward (in the direction of arrow B in FIG. 2), and the clamp claws 70 a abut against the switching lever 40. Further, the switching lever 40 is displaced in accordance with the movement of the clamp pawl 70a under the biasing action of the actuator 68, and the switching slide cam 38 is moved backward (in the direction of arrow B in FIG. 2) via the switching lever 40. .
[0043]
As a result, the tapered surface 38a of the switching slide cam 38 is detached from the tapered surface 42a of the direction changing member 42, and the engagement between the switching slide cam 38 and the direction changing member 42 is released.
[0044]
Next, under the action of the actuator 33, the push plate 33a presses the upper portion of the positioning mechanism 24, for example, the connecting plate 32, and the lower surface 32a of the connecting plate 32 comes into contact with the upper end surface of the boss portion 28a. The position switches from the upper end to the lower end.
[0045]
In the present embodiment, the switching slide cam 38 is engaged with the direction changing member 42 when the positioning mechanism 24 for positioning the vehicle body 14 on the arm 16 is switched to the lower end or the upper end position. Then, the positioning mechanism 24 is displaced via the connecting plate 32 fixed to the direction changing member 42.
[0046]
As is clear from the above, the positioning pin main body 54 constituting the positioning mechanism 24 can be displaced up and down with a simple configuration. For this reason, even when different vehicle bodies are conveyed, it is not necessary to manually adjust the position of the positioning pin main body 54 one by one, and therefore, it is possible to deal with various types of workpieces.
[0047]
FIG. 6 shows the shapes of the switching slide cams 58 and 60 according to another embodiment. In this case, the switching slide cam 58 includes two-stage engaging surfaces (cam surfaces) 58a and 58b that engage with the tapered surface 42a of the direction changing member 42, while the switching slide cam 60 is indicated by a chain line. As described above, three-stage engaging surfaces (cam surfaces) 60a, 60b, 60c that engage with the tapered surface 42a of the direction changing member 42 are provided.
[0048]
Accordingly, when the position of the positioning mechanism 24 is set stepwise in the upward direction (in the direction of the arrow X in FIGS. 2 and 4) depending on the type of vehicle body that is the work, if the switching slide cams 58 and 60 are selected and used, It is possible to deal with various types of vehicle bodies, for example, the vehicle bodies 14 and 14a, and it becomes easy to process the vehicle body under multi-model small-volume production, and versatility can be improved.
[0049]
【The invention's effect】
As described above, according to the present invention, when the positioning pin main body for positioning the workpiece is switched to a plurality of positions according to different workpieces, the positioning pin can be configured with a simple configuration and a simple switching operation by the slide cam and the direction changing member. It can be positioned at a predetermined height.
[0050]
In addition, since the position of the positioning mechanism can be set in multiple stages, even if different types of workpieces are transported, they can be positioned on the hangers efficiently in a short time, so they can handle different types of workpieces. Machining work can be performed quickly on the workpiece.
[Brief description of the drawings]
FIG. 1 is a front view showing a schematic structure of a workpiece positioning mechanism of a transport apparatus according to the present embodiment.
FIG. 2 is a perspective view of a main part of a workpiece positioning mechanism of the transport apparatus of FIG.
3 is a front view showing a schematic structure of a positioning mechanism that constitutes a workpiece positioning mechanism of the transport apparatus of FIG. 2; FIG.
4 is a side view of the positioning mechanism of FIG. 3;
5 is a schematic longitudinal sectional view of positioning pin means constituting a workpiece positioning mechanism of the transport apparatus of FIG.
6 is a schematic side view showing a modified example of the switching slide cam in the workpiece positioning mechanism of the transport apparatus shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Work positioning mechanism of conveying apparatus 12 ... Bed 14, 14a ... Vehicle body 16 ... Arm 18 ... Front / rear direction stopper 20 ... Width direction stopper 24 ... Positioning mechanism 26 ... Drive mechanism 30 ... Shaft pin 33, 62, 68 ... Actuator 38, 58, 60 ... switching slide cam 40 ... switching lever 42 ... direction changing member 44 ... positioning pin means 54 ... positioning pin body 70a, 70b ... clamp claws 72a, 72b ... cam

Claims (3)

In a workpiece positioning mechanism that is provided in a conveyance device that conveys a workpiece and includes a positioning pin for positioning the workpiece,
A positioning pin main body for positioning the workpiece placed on the transfer device;
A spring member that is provided on the positioning pin main body and relaxes the impact force of the positioning pin main body when the workpiece is placed;
A slide cam having cam surfaces of different heights;
A direction changing member that switches the positioning pin to a different height by engaging with the slide cam and displacing in a direction different from the sliding direction;
A workpiece positioning mechanism for a conveying apparatus, wherein the positioning pin main body moves integrally with the direction changing member to position the workpiece at different height positions with respect to different types of workpieces. In the workpiece positioning mechanism of the conveying apparatus according to claim 1,
It said slide cam, work positioning mechanism of the transport device characterized by having a multi-stage cam surfaces engaging said direction changing member. In the workpiece positioning mechanism of the conveying apparatus according to claim 1 or 2,
A work positioning mechanism for a transport apparatus, further comprising a drive mechanism that is installed at a specific position on the transport path of the transport apparatus and that allows the position of the cam surface of the slide cam to be switched.

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