JPH031336Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention enables the drive wheels of the transfer cart to be pressed against the rotational drive shaft so that it can run along the rails, and is used for peripheral conveyance equipment in automated warehouses or for production line conveyance. The present invention relates to a drive device for a transport cart used as a device.

[Conventional technology]

Generally, as described above, this type of drive device for a transfer cart is such that the drive wheel attached to the transfer cart is pressed against a rotational drive shaft arranged along a rail, and the drive wheel is frictionally driven to drive the transfer cart. It is set as.

As a conventional drive device for a transfer trolley, one having a structure as shown in FIGS. 6 and 7 is known (Utility Model Application No. 103362/1983). In this known drive device, a rotary drive shaft 1 rotated by a drive shaft drive device (not shown) is provided parallel to rails 2, and a transfer cart 4 placed on the rails 2 via running wheels 3 is provided with a rotary drive shaft 1 rotated by a drive shaft drive device (not shown). A drive wheel unit 5 having a drive wheel 6 that is pressed against the rotary drive wheel 1 and receives rotational force is attached. Further, as shown in FIG. 7, this drive wheel unit 5 has a housing 8 which is vertically disposed through the deck 7 of the transfer trolley 4 and is fixed to the lower surface of the deck 7. The drive wheel 6 is brought into pressure contact with the rotary drive shaft 1 by pushing the vertical pivot shaft 9 downward by a pressing spring 10 fitted into the housing 8 through the vertical pivot shaft 9 supporting the drive wheel 6. 11 is a cam roller, and 12 is a cam plate supported by an arm 13.

[Problem that the invention attempts to solve]

However, in the above-mentioned conventional transfer truck drive device, the overall height H of the drive wheel unit 5 is increased due to the configuration in which the push spring 10 in the housing 8 obtains the push force against the rotary drive shaft 1 of the drive wheel 6. ,
This increase in height is compensated for by, for example, making the housing 8 protrude above the deck 7 of the truck. Trolley 4
The protrusion of the housing 8 from the upper surface of the housing 8 is often a nuisance, and may not be applicable depending on the system.

Therefore, the present invention aims to reduce the total height of the drive wheel unit and the height of the truck to facilitate layout.

[Means for solving problems]

The present invention has a configuration in which a drive wheel supported by a transfer cart is pressed against a rotational drive shaft, and the drive wheel is frictionally driven by rotation of the rotational drive shaft.
A torsion bar with a radius arm having a required torsion angle is supported on the lower surface of the transfer trolley, the tip of the radius arm is connected to a housing that supports the drive wheel, and the connecting portion between the housing and the radius arm is connected to the housing. It has a configuration that allows it to rotate freely.

[Effect]

Since the drive wheel is pressed together with the housing against the rotary drive shaft via the radius arm by the torsion force of the torsion bar, the drive wheel is frictionally driven when the rotary drive shaft is rotated. The pressing force of the drive wheel can be adjusted by changing the effective length of the torsion bar and the length of the radius arm. In this case, since the arm and torsion bar extend in the lateral direction,
The height of the drive wheel unit is not affected.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

1 and 2 show an embodiment of the present invention, in which, like the conventional example shown in FIG. 6, a transport cart 4 is placed on rails 2 via running wheels 3, A rotary drive shaft 1 rotated by a drive shaft drive device is provided parallel to the rail 2, a drive wheel unit 5 is attached to the deck 7 of the transfer trolley 4, and a drive wheel 6 of the drive wheel unit is pressed against the drive shaft 1. By rotating the drive shaft 1, the drive wheel 6
In this configuration, the driving wheel 6 is rotatably rotated about the horizontal axis 14 by moving the transfer cart 4 by frictionally driving the transport cart 4, and changing the traveling speed by rotating the driving wheel 6 and changing its direction. 15, and a bearing 16 is attached to the pivot center of the upper part of the housing 15. On the other hand, transfer trolley 4
A torsion bar 17 with a radius arm 18 twisted at a required angle is supported on the lower surface of the deck 7 so that the radius arm 18 is parallel to the rotary drive shaft 1 and in a horizontal state.
A downwardly extending shaft 19 is provided at the tip of the radius arm 18 of No. 7, and the shaft 19 is connected to the housing 15.
A drive wheel unit 20 is configured such that it is rotatably fitted onto a bearing 16 inside the drive wheel unit 20 and applies a pressing force to the drive wheel 6 against the rotary drive shaft 1 by the torsion force of the torsion bar 17. Reference numeral 21 denotes a speed control cam roller supported by the housing 15, and when the transport cart hits the cam plate 22 while traveling, the housing 15
This is for rotating the drive wheel 6 at the same time to change the angle of the drive wheel 6 with respect to the drive shaft 1. 23 is a tension spring for holding the drive wheel 6 at a required angle with respect to the drive shaft 1 until the cam roller 21 hits the cam plate 22; It has been intervened. 24 is the tension spring 2 mentioned above.
This is a 45° position stopper for stopping the rotation of the housing 15 holding one end of the drive wheel 6 by the tension spring 23 at the 45° position.

In order for the drive wheels 6 to be frictionally driven by the rotation of the rotary drive shaft 1, a pressing force of the drive wheels 6 against the drive shaft 1 and free rotation of the drive wheels 6 are required. It is necessary for the drive wheels 6 to turn.

The pressing force is applied by the torsion bar 17 via the arm 18. Generally, the pressing force is
It is determined by the amount of deflection δ of the drive wheel 6 from the free state before the drive wheel 6 contacts the drive shaft 1, but the amount of deflection δ
It is required to reduce fluctuations in the pressing force R with respect to changes in the pressing force R.

R=Kδ K: Spring constant For this purpose, it is necessary to reduce K. When the pressing force is applied by a coil spring as in the conventional method, it is necessary to increase the number of windings in order to reduce the above-mentioned K, and the total height of the drive wheel unit becomes higher. In this regard, in the case of the present invention, the pressing force R
R=πGd ⁴ /32l ² s·δ, and πGd ⁴ /32·1/l ² s corresponds to the spring constant K. Here, l is the length of the arm 18, d is the diameter of the torsion bar 17, and s is the effective length of the torsion bar 17. Therefore, in the present invention, the spring constant can be adjusted by changing the length l of the arm 18 and the effective length s of the torsion bar 17. At this time, since the torsion bar 17 and the arm 18 extend in the lateral direction, the total height H of the drive wheel unit 20 does not increase.

3 and 4 show another embodiment of the present invention, in which the connection state between the arm 18 and the housing 15 is changed to further reduce the overall height H of the drive wheel unit 20. That is, in the above embodiment,
Although the shaft 19 at the tip of the arm 18 is inserted into the housing 15, the bearing 2 is inserted at the tip of the arm 18.
5 is installed inside the housing 15, and a shaft 26 is provided upwardly at the center of rotation on the upper surface of the housing 15, and this shaft 26 and the tip of the arm 18 are fitted through a bearing 25. The rest of the structure is the same as that of the embodiment shown in FIGS. 1 and 2.

FIG. 5 shows still another embodiment of the present invention, and in each of the embodiments shown in FIGS. 27, but instead of this method, a tapered shaft fastening device 28 can be used without using a key, and the torsion bar 1 can be fastened as needed.
7 can be twisted and rotated to change the driving wheel pressing force.

According to this embodiment, there is an advantage that it can be adjusted according to the usage environmental conditions (particularly, changes in the coefficient of friction between the drive wheels and the drive shaft). Regarding this point, in the conventional system, the only way was to remove the drive wheel unit 5 and replace the pressing spring 10, but this embodiment can easily deal with this problem and is easy to standardize.

[Effect of idea]

As described above, according to the drive device for the transfer trolley of the present invention, since the pressing force of the drive wheels that are brought into pressure contact with the rotary drive shaft is applied from the lateral direction by the laterally shifted torsion bar, the total height of the drive wheel unit can be reduced. It has the excellent effect of being able to be made low and easy to lay out (for example, there is no need to dig a pit in the floor).

[Brief explanation of the drawing]

Fig. 1 is a plan view of a drive wheel unit showing one embodiment of the device of the present invention, Fig. 2 is a cutaway side view of Fig. 1, and Fig. 3 is a diagram showing another embodiment of the device of the present invention. 1, FIG. 4 is a cutaway side view of FIG. 3, FIG. 5 is another embodiment of the present invention, FIG. 6 is a side view of the conventional device, and FIG. 7 is a side view of FIG. FIG. 7 is a sectional view of the drive wheel unit in FIG. 6; 1 is a rotary drive wheel, 2 is a rail, 4 is a transfer trolley, 6
is the drive wheel, 7 is the deck, 15 is the housing, 17
18 is a torsion bar, 18 is a radius arm, and 20 is a drive wheel unit.

Claims (1)

[Scope of utility model registration request] The drive wheel of the drive wheel unit attached to the transfer trolley that can run on the rail is pressed against the rotational drive shaft arranged parallel to the rail, and the drive wheel is frictionally driven by rotating the rotational drive shaft, thereby forming the transfer trolley. In a drive device for a transfer cart, the tip of a radius arm attached at a certain torsion angle to a torsion bar supported by the transfer cart is connected to the housing that supports the drive wheel, and A drive device for a transfer trolley, characterized in that the housing is rotatable.