JPH052489Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a walking beam conveying device.

[Prior art and its problems]

Relatively low-priced writing instruments such as ballpoint pens and markers are produced in large quantities, so automation of production equipment is progressing. Between processes, the writing instrument as a workpiece is transported by an automatic transport device, and a walking beam transport device is often used as the transport means. This walking beam conveyor has a moving beam with a similar structure placed between a pair of parallel fixed beams, each of which has a plurality of workpiece locking parts provided at equal intervals on its upper edge. When the parts move in a circular or rectangular manner,
This is a method in which rod-shaped workpieces placed on workpiece locking portions of a fixed beam are sequentially conveyed to adjacent workpiece locking portions, and is also referred to as ladder feeding.

Incidentally, it is necessary to increase the conveyance speed due to demands for improved productivity, and for this purpose it is necessary to increase the moving speed of the moving beam. However, when the speed of the moving beam is increased, a large impact is applied to the workpiece when it is transferred between the moving beam and the fixed beam, and this impact causes light workpieces such as writing instruments to stop at the workpiece locking area. It will become detached from the body and normal transportation will no longer be possible. For this reason, there is a limit to the conveyance speed, which has been an obstacle to increasing productivity.

[Purpose of invention]

Therefore, an object of the present invention is to provide a walking beam conveying device that can reliably convey a lightweight workpiece such as a writing instrument at a high speed.

[Structure of the idea]

The configuration of the present invention is that, in the above-mentioned walking beam conveying device, the uniform rotational motion of the drive source is transmitted to the moving beam via the globoidal cam index drive mechanism, and the workpiece is placed between the moving beam and the fixed beam. It is characterized by reducing the rotational speed of the moving beam when changing.

That is, the moving beam is caused to move in a non-uniform circular motion by a globoidal cam index drive mechanism,
When transferring workpieces, reduce the speed and reduce the impact.
When moving a workpiece, it is moved at high speed to increase the conveyance speed.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

The fixed beam 1 consists of a pair of parallel plate-shaped materials,
At its upper edge, V-shaped notches are formed at equal intervals of 30 mm, and these notches serve as workpiece locking portions 11. A writing instrument, which is a rod-shaped workpiece W, is placed on these workpiece locking portions 11 . A pair of movable beams 2 are disposed between a pair of fixed beams 1, and workpiece locking portions 21 with a pitch of 30 mm are also formed on the upper edge of the movable beams 2. A connecting plate 3 is attached below both ends of the moving beam 2, and the lower end of the connecting plate 3 is pivoted at a position offset from the center of rotation of the wheel 4. Therefore, when the wheel 4 rotates, the point on the moving beam 2 performs a rotational movement, but the locus of the workpiece locking part 21 of the moving beam 2 is as shown by the dashed-dotted line circle in FIG. 3, and the fixed beam 1 traverses two adjacent workpiece locking parts 11 from below and above. Therefore, the workpiece W placed on the workpiece locking part 11 is transferred to the workpiece locking part 21 of the rising starting beam 2, and transferred to the adjacent workpiece locking part 11 when descending, and this cycle is repeated. The workpiece W is transported.

Next, as shown in FIG.
1 and output from the output shaft 72. This globoidal cam index drive mechanism 7 is
Although the input shaft 71 and the output shaft 72 are arranged orthogonally,
A globoidal cam is fixed to the input shaft 71, and a turret in which cam followers are arranged radially is fixed to the output shaft 72. And input shaft 71
The globoilda cam has a cam with a predetermined displacement curve, and the cam follower rotates in line contact with the tapered rib of the cam. Therefore, if the input shaft 71 rotates at a constant speed, the output shaft 72 rotates at a non-uniform speed according to the displacement curve of the cam. Then, the non-uniform rotation of the output shaft 72 is caused by the timing belt 6 to rotate the wheel 4.
is transmitted to. Therefore, the workpiece locking portion 21 also rotates at a non-uniform speed, but as shown by the solid curve in FIG.
The circumferential speed of the fixed beam 1 when it crosses the workpiece locking portion 11 is instantaneously almost zero, and in the middle thereof it rotates at high speed. Therefore, when the workpiece W is transferred between the fixed beam 1 and the movable beam 2, almost no impact is applied to the workpiece W, and the transfer is ensured. Since the middle part is rotated at high speed, it is possible to increase the conveyance speed compared to the conventional low-speed constant rotation.
It can contribute to productivity improvement.

[Effect of idea]

As explained above, the present invention rotates the workpiece locking part of the moving beam at a non-uniform speed, decelerates when transferring the workpiece between the moving beam and the fixed beam, and rotates at high speed in the middle. Therefore, it is possible to provide a walking beam conveying device that can reliably convey a lightweight workpiece such as a writing instrument at a high speed.

[Brief explanation of drawings]

Fig. 1 is a front view, Fig. 2 is a side view, Fig. 3 is an explanatory diagram of the rotation locus of the moving beam, Fig. 4 is a plan view,
FIG. 5 each shows an explanatory diagram of the rotational speed of the moving beam. 1... Fixed beam, 2... Moving beam, 3...
Connecting plate, 4...Wheel, 5...Motor, 7...
Globoidal cam index drive mechanism, 1
1, 21...Work locking part, W...Work.

Claims (1)

[Scope of utility model registration request] It is equipped with a fixed beam with a plurality of workpiece locking parts provided at equal intervals on its upper edge and a moving beam with a similar structure. In a walking beam transport device that sequentially transports placed bar-shaped workpieces to adjacent workpiece locking parts, the uniform rotational motion of the drive source is transmitted to the moving beam via the globoidal cam index drive mechanism, and the moving beam and A walking beam conveyance device characterized by reducing the rotational speed of a moving beam when transferring a workpiece between it and a fixed beam.