JPH041135Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transfer device for sequentially conveying workpieces to a plurality of processing stations, and particularly relates to a transfer device suitable for installation in an automobile manufacturing process.

[Conventional technology]

For example, the final line of the automobile body manufacturing process is
Generally, it consists of more than 10 steps. Conventionally, the vehicle body was transported between these processes as shown in FIGS. 4 to 6.

In the figure, a car body 1 is placed on a truck 2, and this truck 2 is locked to a channel-shaped receiver 4 attached to a transfer bar 3. Only the distance will be sent.

This feeding is effected in only one direction by a device not shown, and when the transfer bar 3 moves in the opposite direction, the carriage 2 is stopped at that position. Further, the transfer bar 3 is driven by a gear 6 driven by a motor via a rack 5 fixed on the lower surface.
A reciprocating movement is performed. Furthermore, positioning pins 7 are provided at predetermined positions corresponding to the stations of each process, and are fitted into pin holes 8 provided in the carriage 2 to position the carriage 2. code 9
is a robot provided at each processing station 10, and only three processes are shown in the figure.

This type of transfer device was developed in 1985.
- As disclosed in Japanese Utility Model Application Publication No. 111744, a workpiece is clamped in conjunction with a lift mechanism that moves the transfer bar up and down; In this method, the stroke ratio of the two transfer rails can be increased by using a pinion with a small gear ratio, and as disclosed in Japanese Utility Model Application Publication No. 183742/1983, the stroke ratio of the two transfer rails can be increased. It is known that a supporting metal fitting provided on a connecting member to be connected is moved twice the pitch using an endless cable.

[Problem that the invention attempts to solve]

In the conventional transfer conveyance device described above, the transfer bar 3 for moving the trolley 2 is composed of one transfer bar 3, and the total length may reach approximately 70 m to 80 m.

On the other hand, the environmental temperature inside the factory where the transfer conveyance equipment is installed is approximately 30℃ to 40℃ in summer and winter.
Even if factory heating is done in winter,
It takes a considerable amount of time for heating to reach the entire factory. Therefore, the amount of elongation of the transfer fiber 3 due to thermal expansion is approximately 25 mm to 35 mm even by simple calculation.

In reality, the transfer transfer device is a complex facility, so the thermal expansion is slightly reduced, but even so, the shift in the stop position of the transfer bar 3 may be more than 10 mm, and the positioning pin 7 is not aligned with the pin hole 8 of the cart 2. There was a problem that the position of the trolley 2 could not be fixed.

In addition, none of the proposals in the three publications mentioned above took this problem into account.

The present invention has been made in view of the above circumstances, and aims to provide a transfer conveyance device that can prevent deviations in the stop position of the cart in each process due to environmental temperature differences and improve positioning accuracy. purpose.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a transfer apparatus comprising a transfer bar on which a workpiece is placed and sequentially conveyed to a plurality of processing stations that are connected to each other. The transfer bars are divided into two, and the transfer bars are connected by a connecting bar that is slidable relative to the transfer bars.

[Effect]

According to the configuration of the present invention, the length of the transfer fiber is divided and reduced to a fraction, so the amount of expansion and contraction due to thermal expansion is also reduced to a fraction, and the accuracy of the stopping position is improved several times. Furthermore, the connection bar can restrict the amount of movement of the transfer bar when it tries to separate for some reason.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a transfer conveying device according to the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 3.
In the figures, parts that are the same or equivalent to those of the conventional example shown in FIGS. 4 to 6 are denoted by the same reference numerals, and explanations thereof will be omitted.

The feature of this embodiment is that the transfer bar 3 is 3a,
It is located at the point where it is divided into two parts 3b and connected by a connecting bar 11. Racks 5a and 5b are fixed to the lower surfaces of the transfer bars 3a and 3b, respectively, and are reciprocated by constant strokes by gears 6a and 6b, respectively, driven by motors.

Transfer bars 3a and 3b in this embodiment are connected by a connecting bar 11 provided with stoppers 11a and 11b at both ends, and both ends of the connecting bar 11 are slidably connected to opposing surfaces of transfer bars 3a and 3b. has been done. A shock absorbing material 12 such as urethane is attached to this opposing surface. By this connecting bar 11, transfer bar 3a,
3b move away from each other for some reason, the amount of movement is regulated, and when they move toward each other, the shock absorbing material 12 protects the trolley 2 and car body 1 from impact. It's getting old.

According to this embodiment, the transfer bar 3 is
Since it is divided into two pieces, a and 3b, the length of each piece is halved, and the amount of expansion and contraction due to environmental temperature fluctuations is also halved. Therefore, the accuracy of the stopping position of the bogie 2 moved by the transfer bar 3 and the car body 1 placed on the bogie 2 is doubled, and the positioning pin 7 is placed on the bogie 2 due to positional deviation. Accidents in which the line does not fit into the formed pin hole 8 and stops are greatly reduced.

As a result, the position of the transfer bar 3 relative to the motor 6, which had conventionally been adjusted in response to changes in environmental temperature, becomes unnecessary. Further, since the transfer bar 3 is shortened, processing during manufacturing thereof becomes easier, and processing accuracy improves.

In this embodiment, the case where the transfer bar 3 is divided into two has been described, but the number of divisions is not limited to two, and the positioning accuracy improves as the number of divisions increases.

[Effect of idea]

As described above, according to the present invention, the transfer bar provided in the transfer conveyance device is divided into multiple pieces, so that the stopping position of the cart and the workpiece placed on the cart can be adjusted without being affected by thermal expansion. Accuracy can be improved, and position adjustment of the transfer bar relative to the motor due to changes in environmental temperature can be made unnecessary. Therefore, machining on the transfer bar becomes easy and machining accuracy can be improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing an embodiment of the transfer conveyance device according to the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is an enlarged view of the main part of FIG. 2, and FIG. The figure is a plan view schematically showing a conventional transfer transfer device, FIG. 5 is a front view of FIG. 4, and FIG. 6 is an enlarged view of the main part of FIG. 1... Vehicle body (workpiece), 3... Transfer bar, 10... Processing station, 11... Connection bar.

Claims (1)

[Claims for Utility Model Registration] (1) In a transfer device provided with a transfer bar on which a workpiece is placed and sequentially conveyed to a plurality of processing stations that are connected to each other, a plurality of said transfer bars are provided. divided into
A transfer device characterized in that the transfer bars are connected by a connecting bar that is slidable with respect to the transfer bars. (2) The transfer device according to claim 1, wherein the divided transfer bars are reciprocated by separate drive sources.