JPS62838Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lift-and-carry type conveying device.

Conventional conveying devices of this type have a structure in which workpieces are conveyed intermittently at equal pitches.
For this reason, if the conveyance pitch to the next machining station must be larger than the conveyance pitch between other stations due to the size of the processing equipment, a so-called idler station is installed between the two machining stations. The distance between the two processing positions is twice the conveyance pitch. However, if such an idler station is provided, extra workpieces will accumulate at the idler station, and as the number of idler stations increases, the number of workpieces that will stay will increase proportionally, which will increase waste. There were deficiencies.

In view of the above-mentioned drawbacks of the conventional device, the present invention aims to eliminate the idler station and prevent workpieces from accumulating in a location corresponding to the conventional idler station.

This invention uses two two-stage cylinder devices, one
After the pitch transfer operation, the height is lowered to allow one more pitch transfer operation, and the pitch between adjacent stations is larger than the pitch between other stations at the lowering end position of the transfer fiber. The gap in the height direction between the top surface of the workpiece holder that moves between the pitch sections and the top surface of the workpiece holder installed at the unloading station of the large pitch section,
The gist is that the distance between the top surface of the workpiece holder that moves between other stations and the top surface of the workpiece holder of the other station is made smaller.

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

Figures 1 to 4 show the configuration and operating conditions of an embodiment of the present invention. In these figures, a two-stage lift cylinder device 10 and a transfer cylinder are mounted on a fixed stand or base (not shown). The two-stage cylinder devices 20 are each fixed. Both cylinder devices 10, 20 consist of cylinders 11, 21, first pistons 12, 22, and second pistons 13, 23. . Inside the cylinders 11, 21 are chambers 14, 15, 24,
25 is formed, and other chambers 16, 1 are formed in the first pistons 12, 22 by the second pistons 13, 23.
7, 26, and 27 are formed, respectively. In addition, the cylinders 11 and 21 have small holes 11 which are the entrance and exit for hydraulic pressure.
1,112,113: 211, 212, 213 are bored, and the first pistons 12, 22 are also bored with small holes 121, 122: 221, 222, and at the same time, an annular chamber 123, 223 is formed. Piston rods 131, 231 are connected to the second pistons 13, 23, and the ends of the rods 131, 231 protrude outside the cylinders 11, 21.

An operating rod 30 is connected to the protruding end of the piston rod 131, and the lower ends of a plurality of swing arms 31 are pivotally connected to the operating rod 30. The swing arm 31 is configured to swing around the axis 0 of a pin 32, and a roller 33 is rotatably mounted on the upper end portion of the swing arm 31, which extends in a curved manner. The rolling surface of the roller 33 is always in contact with the lower surface of the transfer bar 34, so that when the swing arm 31 swings in the direction of arrow A, the transfer bar 34 is pushed upward.

The end of the transfer bar 34 is connected to the fixed pin 231a of the protruding end of the piston rod 231 described above.
is connected to via a long hole 35. The elongated hole 35 has a vertically elongated shape, so that when the piston rod 231 moves in the axial direction, the transfer bar 34 also moves in the same direction (transfer direction).

Workpiece holders 36 and 37 are fixed to the upper surface of the transfer bar 34. Received money 36,3
7, the height of the receiver 37 is made higher than the height of the other receivers 36 by h. Said money received 3
As shown in FIG. 2, a pair of workpiece supports 38 are arranged on both sides of the workpieces 6 and 37 (in the direction perpendicular to the plane of the paper in FIG. It is set up. Figures 1 and 2 show the pedestal 3
8 shows a state where the workpiece W is placed on the upper part of the workpiece 8, but if the transfer bar 34 and the support 37 rise between the two supports 38 in FIG. (showing the lowest position) receiver 36,
The work W is placed on each of the workpieces 37, and a gap may be formed between the workpiece W and the upper surface of the pedestal 38.

The interval (pitch) between the plurality of receivers 36, 37 is P or 2P as shown in FIG.
That is, the first processing station 1st and the second
If the pitch between the processing station 2st and the processing station 2st is P, the pitch up to the next processing station 3st may have to be larger than P due to reasons such as the processing equipment being large, so the large pitch section is set as 2P. There is. In this case, the receiver 37 is set at the station immediately before the pitch 2P, which is higher by the amount h described. As shown in Fig. 1, the fourth processing station 4st is located at a distance of P from the 3rd st, and a low-height receiver 36 is set, but the fifth processing station comes at a distance of 2P after 4st. If
A receiver 37 higher by h is set on the 4th st.

As a result, when the transfer bar 34 is located at the lower end, the upper surface of the workpiece holder 37 moving between the large pitch sections in which the pitch between adjacent stations is larger than the pitch between other stations, The distance in the height direction between the top surface of the workpiece holder 38 disposed at the unloading station in the pitch section is the same as the distance in the height direction between the top surface of the workpiece holder 36 that moves between other stations and the workpiece holder 3 of the other station.
8 is smaller than the distance from the top surface.

The operation of the apparatus of this embodiment constructed in this manner will be described next. Figure 1 shows piston rod 1
31 is at the rightmost position, that is, the transfer bar 34 is at the lowermost position, and at the same time, the other piston rod 231 and the transfer bar 34 are at the leftmost position. . In other words, in the conveyance cycle diagram of FIG. 3, the transfer bar 34 is located at the position . In this state, when hydraulic pressure is sent to the small hole 131 of the two-stage lift cylinder device 10, the second piston 13 is moved to the left by the hydraulic pressure from the small hole 122, and the first piston 1
It touches the left end inner wall of No.2. Also, the first piston 12
The right outer wall of the cylinder 11 moves to the left by the hydraulic pressure from the small hole 113 and comes into contact with the left inner wall of the cylinder 11 . Depending on the amount of leftward movement of the second piston 13 and the first piston 12, through the swinging of the swinging arm 31,
Transfer bar 34 is raised to its uppermost position (position 3 in FIG. 3). As a result of this rise, the workpieces W at each station are placed on the receivers 36 and 37 and lifted to the uppermost position.

Next, when hydraulic pressure is sent to the small hole 212 of the two-stage transfer cylinder device 20, the second piston 23 moves to the right due to the action of the hydraulic pressure sent from the small hole 221 to the chamber 26, and the first station 1st and The first piston 22 moves by a pitch P with respect to the second station 2st, and comes into contact with the inner wall of the right end of the first piston 22 and stops (the position shown in FIG. 3). Due to this operation, the transfer bar 34 moves to the right by an amount P integrally with the piston rod 231, and the work W on the supports 36 and 37 at each station is moved to the right.
are each moved to the right by P.

Next, while the hydraulic pressure is being sent from the small hole 113 as described above, when the hydraulic pressure is sent from another small hole 112, the second piston 13 is moved to the right inner wall of the first piston 12 by the hydraulic pressure flowing into the chamber 16. Move to the right until it touches. In this case, when the oil pressure value from the small hole 113 and the oil pressure value from the small hole 112 are the same, there is a difference in the area of the second piston 13 facing the chambers 17 and 16, respectively, so that the right However, the oil pressure value from the small hole 113 may be made slightly larger than the oil pressure value from the small hole 112.
The position where the first piston 12 stops and only the second piston 13 moves to the right in this way is referred to as an "intermediate stop position". In Figure 3, this is the position. The workpiece W and the receiver 36 at such an intermediate stop position,
The relationship between 37 and 37 is shown in FIG. That is, the workpiece W is placed on the receiver 37 located at the midpoint between the second station 2st and the third station 3st, but the workpiece W at the 2st station is placed on the receiver 38 and the receiver 36 is placed at the middle point between the second station 2st and the third station 3st. A gap t is generated between the upper end surface and the upper end surface. If the difference between the height of the receiver 37 and the height of the receiver 38 at the intermediate stop position is t', then t+t'=
There is a relationship like h.

Next, when hydraulic pressure is supplied to the small hole 211 with the hydraulic pressure being supplied to the small hole 212 of the two-stage transfer cylinder device 20, the first piston 22 moves to the right by P along with the piston 23. The amount of movement in this case is also P. As a result, the transfer bar 34 is moved to the right by 2P from the state shown in Fig. 1 (the position shown in Fig. 3), but as shown in Fig. A workpiece receiver 37 located in the middle and a second station
Between the workpiece W on the 2st workpiece pedestal 38,
Because there is a gap t', the workpiece W at the 2nd st remains in that position, and only the workpiece W on the receiver 37 located at the intermediate position between the 2nd and 3rd st.
It moves to the right and becomes the state shown by the two-dot chain line.

Next, in the two-stage lift cylinder device 10, when oil pressure is sent to the chamber 16 as described above, when oil pressure is further sent from the small hole 111, the first piston 12 moves to the right together with the second piston 13, as shown in the first figure. The state will be as follows. That is, the transfer bar 34 is further lowered from the intermediate stop position as shown in FIG. 4 to the state shown in FIG. In Figure 3, it is the position. As the transfer bar 34 is lowered in this manner, as shown in FIG.
The receiving money 37 in the 3rd st is the transfer bar 3.
4, so the workpiece W is placed on the 3st pedestal 38.
placed on top.

Finally, when hydraulic pressure is sent to the small hole 213 of the two-stage transfer cylinder device 20, the hydraulic pressure is transferred to the chamber 25.
Since the liquid flows into the chamber 27 through the small hole 222, both the first piston 22 and the second piston 23 move to the left and return to the state shown in FIG.

As a result, the transfer bar 34 repeats the lift-and-carry movement to move the plurality of workpieces W to the P.
Or, only 2P has been transported, and from then on, every time the processing process at each station is completed, the 3rd
The transport cycle shown in the figure will be repeated.

In the above embodiment, the height of the workpiece holders is different by h to prevent the workpiece W from staying in the middle position of the large pitch section, but the height of the workpiece holders is all the same and the workpiece It is also possible to make the heights of the pedestals different. FIGS. 5 and 6 show a second embodiment that embodies this point. Components that are the same as those in the previous embodiment are designated by the same reference numerals. In the previous embodiment shown in FIG. 1, when the transfer bar 34 is at the rearward end, the receiver 37 is installed at a position corresponding to the station just before the large pitch section, but in this embodiment A pedestal 38a whose height is lower by h is installed at the processing station immediately after the pitch section.

The operation of the second embodiment is similar to that of the first embodiment described above, and the two-stage lift cylinder device 10 and the two-stage transfer cylinder device 20 operate according to the transfer cycle shown in FIG. In this case, the state of the intermediate stop position shown in FIG. 3 is illustrated as shown in FIG. 6. That is, when the workpiece W descends from the uppermost position to the intermediate stop position, the workpiece W at the second station 2st is placed on the pedestal 38 of the second station 2st, and a gap t is created between it and the pedestal 36.
The workpiece W carried to the middle position of the large pitch section is still placed on the receiver 36 because no receiver is installed at that location. Next, when the two-stage transfer cylinder device 20 is activated and the transfer bar 34 is moved from the position shown in FIG. 3 to the position shown in FIG. The situation will be as shown by the chain double-dashed line at the third station 3st. Thereafter, when the two-stage lift cylinder device 10 is activated and the transfer bar 34 is lowered (→
), the 3rd workpiece W is placed on the low pedestal 38a.

In the case of the first embodiment, the 2st and 3rd cradle 3 in Fig. 4
Since the heights of the workpieces 8 and 8 are equal, the heights of the workpieces W after being placed are all the same, whereas in the second embodiment, the heights of the workpieces W
As shown in the figure, since the heights of the pedestals 38 and 38a differ by h, the height of the workpiece W after being placed on the pedestal 38a is lowered by h, and in this state, the workpiece W is clamped and processed. Ru.

As described above, the present invention is a lift-and-carry type transfer device in which a workpiece is transferred by reciprocating the transfer bar in the vertical direction and in the transfer direction. A two-stage lift cylinder device for moving the transfer bar up and down, a two-stage transfer cylinder device for reciprocating the transfer bar in the conveyance direction via another piston rod, and a workpiece fixedly provided at each processing station. A workpiece holder and a plurality of workpiece holders fixed on the transfer bar are provided, and the pitch between adjacent stations at the lowering end position of the transfer bar is larger than the pitch between other stations. Workpieces that are moved between other stations change the distance in the height direction between the top surface of a workpiece holder that is moved between pitch sections and the top surface of a workpiece holder that is disposed at the unloading station of the large pitch section. Since the distance between the top surface of the receiver and the top surface of the workpiece holders of other stations is made smaller, the workpieces do not stay in the idler station as in the conventional case, and waste can be avoided.
In addition, the device of the present invention is more resistant to chips than the corresponding type, which is equipped with a slider on the transfer bar and brought into contact with the stopper of the fixed part, and changes the conveyance pitch depending on the conveyance section. It is highly reliable and has a simple structure.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional front view of an embodiment of the device of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, Fig. 3 is a conveyance cycle diagram, and Fig. 4 is an intermediate stop position. FIG. 5 is a front view similar to FIG. 1 showing a second embodiment of the device of the present invention, and FIG. 6 is a partially enlarged view of FIG. 1 showing the device in FIG. FIG. 4 is a partially enlarged view similar to FIG. 10... Two-stage cylinder device for lift, 20...
Two-stage cylinder device for transfer, 12, 22...
...first piston, 13,23...second piston,
131, 231... Piston rod, 30... Operation rod, 31... Swinging arm, 34... Transfer bar, 36, 37... Workpiece holder, 3
8, 38a... Workpiece pedestal.

Claims (1)

[Scope of utility model registration request] In a lift-and-carry transfer device that transports a workpiece by reciprocating a transfer bar in the vertical and transport directions, the transfer bar is moved up and down via a swing arm by reciprocating a piston rod and an operating rod. a two-stage cylinder device for lifting, a two-stage cylinder device for transfer that reciprocates the transfer bar in the transport direction via another piston rod, and a workpiece holder fixedly provided at each processing station; a plurality of workpiece holders fixed on the transfer bar, and a large pitch section in which the pitch between adjacent stations is larger than the pitch between other stations at the lowering end position of the transfer bar; The distance in the height direction between the top surface of the workpiece holder that is being moved and the top surface of the workpiece holder installed at the unloading station in the large pitch section is the same as the top surface of the workpiece holder that is being moved between other stations. A transfer device characterized in that the distance between the station and the top surface of a workpiece holder of another station is smaller than that of the other station.