JP2000095322A - Work carrying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously carry works at every preset pitches by converting reciprocating movement by fluid pressure cylinders into the mutual approaching/ separating movement of two clampers to alternately carry the works with two clampers. SOLUTION: When driving-side rack members 15a, 15b engaging a driving-side gear 12 are reciprocatingly moved, two driven-side rack members 22a, 22b are reciprocatingly moved and two clamp cylinders 24a, 24b respectively provided thereon for alternately clamping works W are moved to approach/separate to/from each other. When the clamp cylinder 24a is moved forward in the condition that the work W is clamped by one clamp cylinder 24a, the works W are carried while the other clamp cylinder 24b is moved backward without clamping the works W. in this way, the works W can be carried during both forwarding and backwarding of the driving-side rack members 15a, 15b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work transfer device for transferring a work at regular intervals.

[0002]

2. Description of the Related Art When a belt-like work or the like is conveyed at a constant pitch or stroke, there is a conventional type in which a clamper for clamping the work is reciprocated by a pneumatic cylinder. In this case, when the clamper is moved forward by the pneumatic cylinder, the work is sandwiched by the clamper, and when the clamper is moved backward by the pneumatic cylinder, the clamper is opened.

[0003]

As described above, when the work is transported only when the clamper is moved forward by the pneumatic cylinder, the work is stopped and stands by when the clamper is moved backward, and the work is stopped. There is a problem that transport cannot be performed efficiently.

An object of the present invention is to convert a reciprocating motion by a hydraulic cylinder into a movement of two clampers approaching and moving away from each other.
An object of the present invention is to allow a workpiece to be continuously transported at a predetermined pitch by alternately transporting a workpiece by one clamper.

[0005]

According to a first aspect of the present invention, there is provided a workpiece transfer device which meshes with a driving cylinder which reciprocates a driving rack member which meshes with a driving gear in a linear direction, and a driven gear which is connected to the driving gear. A first clamp cylinder, which is provided on the first driven rack member and clamps a workpiece, and is provided on a second driven rack member extending in parallel with the first driven rack member and meshing with the driven gear. A second clamp cylinder that clamps the work, and a fluid pressure control unit that performs a clamp operation of one of the two clamp cylinders that moves in a direction in which the work is transported to release the operation of another clamp cylinder. The work cylinder is conveyed during both forward and backward movements of the drive-side rack member by the drive cylinder. The features.

When the drive-side rack member reciprocates in a linear direction by the drive cylinder, the work is clamped and conveyed by one clamp cylinder, and the other clamp cylinder prepares for the work transfer. In the backward movement, the work is clamped and conveyed by the other clamp cylinder, and one clamp cylinder prepares for the work conveyance. In this way, the workpiece is continuously and efficiently transported without being stopped.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing a basic structure of a work transfer device according to an embodiment of the present invention, and FIG. 2 shows an air pressure control means for controlling supply of air pressure to a cylinder provided in FIG. FIG. 3 is a process diagram showing a procedure for transporting a work.

[0009] A drive shaft 1 is provided in an apparatus body (not shown).
The drive shaft 11 is rotatably mounted. A drive pinion gear 12 is attached to one end of the drive shaft 11, and a driven pinion gear 13 is attached to the other end.

The apparatus main body includes a driving pinion gear 1.
A first drive-side rack member 15a having rack teeth 14a meshing with the second drive member 2 is provided to be reciprocally movable in the axial direction, and is reciprocated by a first drive cylinder 16a to drive the drive-side rack member 15a. Piston rod 17a
Are connected to the rack member 15a. Further, the second drive-side rack member 15b, on which rack teeth 14b meshing with the drive-side pinion gear 12, are formed, is connected to the first rack member 1.
A piston rod 17b is provided so as to be reciprocally movable in the axial direction in parallel with 5a, and reciprocated by a second drive cylinder 16b to drive the drive side rack member 15b.
Are connected to the rack member 15b. Thus, in the illustrated case, the two drive cylinders 16a and 16b are provided, but the drive shaft 11 may be rotationally driven by one drive cylinder.

The apparatus main body is provided with a first driven rack member 22a formed with rack teeth 21a meshing with the driven pinion 13 so as to be reciprocally movable in the axial direction. A first clamp cylinder 24a is mounted via 23a. Further, a second driven rack member 22b formed with rack teeth 21b meshing with the driven pinion 13 is provided in parallel with the first driven rack member 22a so as to be reciprocally movable in the axial direction. A second clamp cylinder 24b is connected to the driven rack member 22b via a bracket 23b.
Is attached.

Each clamp cylinder 24a, 24
b, the piston rods 25a and 25b reciprocating by
Work receiving portion 2 provided on rack members 22a and 22b
6a and 26b are opposed to each other, and a band-shaped work W is clamped between them. That is, a clamper is constituted by each piston rod and the work receiving portion.

Each cylinder 16a, 16b, 24
Reference numerals a and 24b denote pneumatic cylinders, and compressed air from an air pressure source 27 is supplied through an air pressure passage 28 as shown in FIG. Drive cylinder 16
A switching valve 31 is provided in the pneumatic pressure passage 28 to alternately supply compressed air to the clamp cylinders 24a and 24b. The air passage 28 is provided.

The switching valve 31 is an electromagnetic valve that is operated by an electric signal from the control unit 34. The switching valves 32 and 33 are provided with two push buttons 32a, 32b, 33a and 33b, respectively. The stoppers and the push buttons (not shown) provided on the apparatus body at the reciprocating stroke ends of the respective switching valves 32 and 33 are provided. , The switching valve 32,
Reference numeral 33 indicates a switching operation. However, these switching valves 32 and 33 may be electromagnetic valves that are activated by electric signals.

FIG. 2 shows a state in which compressed air is supplied to the drive cylinder 16a and the piston rod 17a is advanced, and the piston rod 25a of one clamp cylinder 24a hits the work W and the other clamp cylinder 24a This shows a state in which the piston rod 25b of the cylinder 24b is retracted and the clamp of the work W is released.

In FIG. 1 and FIG.
Is transported to the left in the drawing as shown by the arrow, as shown in FIG. 3A, the workpiece W is moved by the piston rod 25a by the air pressure supplied into the clamp cylinder 24a through the switching valve 32, as shown in FIG. In the clamped state, a signal is sent to the switching valve 31 to supply compressed air to the second drive cylinder 16b to drive the drive shaft 11.

As a result, the first driven rack member 22
1a moves leftward in FIG. 1, and the second driven rack member 22b moves rightward. Therefore, as shown in FIG. 3B, the two clamp cylinders 24a and 24b move closer to each other, and the work W is moved by the first clamp cylinder 24a that moves by the stroke S in the work W conveyance direction. Will be transported. At this time, the second clamp cylinder 24
b moves backward and prepares for the next work transfer.

When the two clamp cylinders 24a and 24b move close to a predetermined position in this way, the push buttons of the switching valves 32 and 33 for supplying compressed air to the respective clamp cylinders 24a and 24b are operated by stoppers. In operation, each of the switching valves 32 and 33 is operated as shown in FIG.
Is automatically switched from the position shown in FIG. Thereby, as shown in FIG. 3C, the second clamp cylinder 24b in the retracted state clamps the work W, and the clamp by the first clamp cylinder 24a is released.

In this state, when the switching valve 31 is de-energized, compressed air is supplied to the first drive cylinder 16a, and as shown in FIG. , 24b move in directions away from each other, and the workpiece W is transported by the second clamp cylinder 24b that moves forward in the direction of transporting the workpiece W. At this time, the first clamp cylinder 24a moves backward to prepare for the next work transfer.

As described above, by alternately clamping the two clamp cylinders for clamping the work W in both the forward movement direction and the backward movement direction of the drive-side rack members 15a and 15b that reciprocate in the linear direction, W can be transported continuously.

FIGS. 4 to 6 are views showing an apparatus main body 40 in which the members shown in FIG. 1 are incorporated. Two guide rails 41 and 42 fixed in parallel to the apparatus main body 40 have two parts. Clamp cylinders 24a and 24b are respectively mounted so as to be reciprocally movable. As shown in FIG.
A stopper block 43 is attached to a central portion in the longitudinal direction of the cylinder, and stopper blocks 44 and 45 are attached to both ends of the clamp cylinders 24a and 24.
b, the reciprocating stroke S is restricted, and the push buttons 32a,
The switching operation of each switching valve is automatically performed upon hitting 32b, 33a, 33b.

Each clamp cylinder 24a, 24
b is fixed to one end of the driven side rack members 22a and 22b, and meshes with the driven side pinion gear 13.
The drive-side pinion gear 12 connected to the gear 13 via the drive shaft 11 and the drive-side rack members 15a, 15b meshing with the drive-side pinion gear 12, respectively.
The drive cylinders 16a and 16b for driving the respective drive-side rack members are also incorporated in the apparatus main body 40.

As shown in FIG. 6, the clamp cylinder 24
A clamp member 46 is attached to the piston rod 25b so as to face the workpiece receiving portion 26b integrated with the clamp member b, and the clamp cylinder 24a has the same structure. Thereby, the work W is clamped between the work receiving portion and the clamp member.

The work transfer device having the structure shown in FIGS. 4 to 6 transfers the work in the same manner as in the case of FIG. 1 showing the basic structure.

The present invention is not limited to the above embodiment, and it goes without saying that various changes can be made without departing from the spirit of the present invention.

For example, each cylinder is operated by air pressure in the case shown in the figure, but may be operated by hydraulic pressure. The illustrated work is a belt-like material such as a steel plate, but can transport various members such as a round bar and a prism. Further, as the material of the work to be conveyed, not only metal but also plastic, wood, woven fabric and the like can be conveyed.

[0027]

According to the present invention, the drive rack member which reciprocates in the linear direction by the drive cylinder is moved toward and away from the drive rack member by the pinion gear at both the forward movement and the backward movement. By alternately operating the two clamp cylinders, it is possible to continuously convey a workpiece at a predetermined pitch. Thereby, the work can be transported efficiently.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a basic structure of a work transfer device according to an embodiment of the present invention.

FIG. 2 is a pneumatic control circuit diagram showing pneumatic control means for controlling supply of pneumatic pressure to a cylinder provided in FIG.

FIG. 3 is a process chart showing a work transfer procedure.

FIG. 4 is a front view showing an apparatus main body into which the work transfer device having the basic structure shown in FIG. 1 is incorporated.

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is a right side view of FIG.

[Explanation of symbols]

 Reference Signs List 11 drive shaft 12 drive-side pinion gear 13 driven-side pinion gear 14a, 14b rack teeth 15a, 15b drive-side rack member 16a, 16b drive cylinder 17a, 17b piston rod 21a, 21b rack tooth 22a, 22b driven-side rack member 23a, 23b Brackets 24a, 24b Clamp cylinders 25a, 25b Piston rods 26a, 26b Work receiving part 27 Air pressure source 28 Air pressure flow path 31-33 Switching valve 34 Control part 40 Device body 41, 42 Guide rail 43-45 Stopper block 46 Clamp member

Claims (1)

[Claims] 1. A drive cylinder that reciprocates a drive-side rack member that meshes with a drive-side gear in a linear direction, and a first gear that meshes with a driven-side gear connected to the drive-side gear.
A first clamp cylinder that is provided on the driven side rack member and clamps the work; and is provided on a second driven side rack member that extends in parallel with the first driven side rack member and meshes with the driven side gear, A second clamp cylinder that clamps the work, and a fluid pressure control unit that performs a clamp operation of one of the two clamp cylinders that moves in a direction in which the work is transported to release the operation of another clamp cylinder. A work transfer device for transferring the work during both forward and backward movements of the drive-side rack member by the drive cylinder.