JPH0138725B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pallet conveying device, and more specifically, a pallet conveying device that intermittently conveys a pallet on which a work is mounted in a working area, and intermittently conveys a pallet in other areas. This relates to an intermittent/free pallet conveying device that simply conveys pallets without any restrictions.

[Prior art and its problems] Conventionally, various devices have been used to stop and transport the pallet intermittently in a work area where a workpiece is placed on a pallet and the workpiece is processed. However, it was difficult to operate at high speed while maintaining the accuracy of the pallet stopping position. In FIG. 1, racks having triangular protrusions on the surfaces are fixed to the upper and lower surfaces of a pallet 1, one rack is used as a rack 2 for positioning the pallet 1, the other rack is used as a rack 3 for transporting the pallet 1,
The teeth of the positioning rack 2 stop and fix the pallet 1 by engaging with the tip of the plunger 5 engaged with the pneumatic or hydraulic cylinder 4, and the tip of the plunger 5 moves from the teeth of the positioning rack 2 to the tip of the cylinder 4. A pawl 8 engaged with a lever 7 that swings due to the rotation of a cam 6 transports the pallet 1 when the pallet 1 is separated by retreating. In FIG. 2, a rack 9 that engages with a pinion 10 is fixed to the lower surface of the pallet 1, and the pinion 10 is engaged with a sprocket 11 that is coaxially engaged with the pinion 10 and an output shaft of an indexing device 12 that serves as a drive source. The pallet 1 can be driven intermittently in synchronization with the rotation and stoppage of the drive source by means of a chain 14 suspended from a sprocket 13 which is stopped. However, in the former case, although the pallet 1 can be positioned accurately, it is difficult to increase the speed due to the influence of inertia when the pallet 1 is stopped, and in the latter case, the chain 14, pinion 10, and rack used in the drive system are Incorrect positioning of pallet 1 due to backlash of 9, pinion 1
There were disadvantages such as the difficulty of automatic firing between the 0 and Rack 9, and the complexity of the structure. Further, JP-A-54-155474 is known as a pallet conveyance device having an intermittent conveyance section and a free conveyance section, but in this invention, the intermittent conveyance section and the free conveyance section are opposite in direction. was also established as a separate route. In other words, the conveyance path on the side where the tooling unit (printing machine) operates is intermittent conveyance,
The conveyance path on the pallet return side is free conveyance. Furthermore, Japanese Patent Publication No. 55-36460 is known as a pallet conveying device having an intermittent conveyance section and a free conveyance section, but this invention is also disclosed in the above-mentioned Japanese Patent Publication No. 54-36460.
Similar to the 155474 publication, the conveyance path on the side where the tooling unit (station) operates is intermittent conveyance by a combination of large and small pallet conveyance stroke pitches, and the conveyance path on the pallet return side is free conveyance. In addition, as a system that synchronizes the work unit and the transport unit,
Publication No. 178237 (Utility Model Application No. 55-93435) is known, but this idea proposed a single multi-axis processing machine, and only a single unit with a drive source was synchronized. Ta. The aforementioned Japanese Patent Application Publication No. 1973-
In the 155474 publication as well, the driving sources for each intermittent conveying section and the first and second elevator sections are connected from the index through rods, links, etc., so the devices are integrated, resulting in less flexibility of the system.

In addition, in Japanese Patent Publication No. 55-36460, since the pallet feed pitch during operation of the touring unit and between sealing units (between stations) is specified, the pitch width of the pallet feed pitch between touring units (between stations) is specified. It had to be precise and the structure was complex.

[Means for Solving the Problems] The present invention provides at least one pallet intermittent/free conveyance unit in which an intermittent/free conveyance section for sending pallets and a free conveyance return conveyor for returning the pallets are arranged vertically. The pallet intermittent/free conveyance device has a direction changer for changing the direction of the pallet at both ends of the pallet intermittent/free conveyance unit, wherein the pallet intermittent/free conveyance unit includes: an intermittent conveyance section that conveys the pallet intermittently in synchronization with the operation of a tooling unit disposed corresponding to the intermittent/free conveyance section; and a free conveyance section that conveys the pallet without being restricted by the operation of the tooling unit. The above-mentioned intermittent
a free conveyance section is disposed on the top surface of the free conveyance unit at least upstream of the intermittent conveyance section disposed at the middle part of the top surface of the intermittent/free conveyance unit with respect to the pallet feeding direction; and the direction changer;
The intermittent/free pallet conveying device is characterized in that the intermittent/free conveying section and the return conveyor each have a driving source.

[Examples] Examples of the present invention will be described below with reference to the drawings. FIG. 3 is a perspective view of the overall appearance of the present invention. FIG. 4 is a schematic diagram for explaining FIG. Four pallet intermittent/free conveyance units 19 each having a free conveyance section that freely conveys pallets and an intermittent conveyance section that intermittently convey pallets are connected, and the pallets 15 are transferred from the pallet carriage 17 of the intermittent/free conveyance units 19 to the return conveyor 16. A return lifter 20 serves as a direction change device for the pallet 15 to be transferred to the
are located side by side. FIG. 5 is a vertical cross-sectional view of essential parts of the starter lifter 18 and return lifter 20, and FIG. 6 is a side vertical cross-sectional view of FIG.
In the starter lifter 18, lifter guides 23, 23 are installed opposite to each other in the center of a base 22, and between the lifter guides 23, 23, there is a lower elevating platform 24 that engages with the lifter guides 23, 23 and moves up and down. A rod 26 of an air cylinder 25 is fixed to the air cylinder 25 by screwing or the like. Lifting platform 2
A geared motor 27 is disposed below one end of the geared motor 27, and a pulley 28 that is engaged with the output shaft of this geared motor 27 and a belt 29 of the lifting platform 24 are connected to each other.
A belt 32 is suspended between a pulley 30 that drives a pulley 30 and a pulley 31 that is coaxially locked. The belt 29 surrounds the pulleys 30, 33, and 34 and is driven by the pulley 30. Further, on one side of the starter lifter 18, auxiliary conveyors 35 and 36 are arranged corresponding to the lower and upper end stop positions of the lifting platform 24. The auxiliary conveyors 35 and 36 are used to transfer the auxiliary conveyor 35 to the lifting platform 24 or to transfer the pallet 15 from the lifting platform 24 to the intermittent/free conveyance unit 19, and are equipped with a geared motor 37 at the outer lower end. 38 is arranged and geared motor 3
Pulleys 39 and 4 locked to the output shafts of 7 and 38
0 and a pulley 4 that drives belts 41 and 42.
Pulleys 45 and 46 coaxially locked with 3 and 44
Belts 47 and 48 are suspended between the belts 4 and 4.
1 and 42 are suspended by pulleys 43 and 49, and 44 and 50, respectively. The lifter guide 2
3 and 23 have one end fixed to the base 22 and the other end fixed to the upper plate 51 by a supporting member 52 such as an angle member.

FIG. 7 is a partially cutaway perspective view of the pallet 15, in which a work holding member 53 for holding a work is fixed to the upper surface of the pallet 15 by screws or the like. This work holding member 53 is provided with a plurality of grooves 54 into which the work is inserted and held. The pallet 15 has a T-shaped cross section, and running rollers 56 are rotatably attached to the outer surfaces and lower end surfaces of the lower projections 55, 55 at both ends, respectively. Further, on one side of the central lower projection 57 of the pallet 15, a plurality of follower rollers 58 are rotatably provided at equal intervals and engage and disengage from parallel cams provided in the intermittent/free conveyance unit 19, which will be described later. A follower roller is located at a position opposite to the extension of the arrangement of the follower rollers 58 on one side, at the same interval as the arrangement interval of the follower rollers 58, and corresponding to the center position of the continuous arrangement of the follower rollers 58. 59 are rotatably provided.

8 and 9 are front and side vertical sectional views of the intermittent/free conveyance unit 19. FIG. frame 6
On the base 62 inside the 0, there are an electric motor 61 as a driving source, and an electromagnetic clutch 64 and an electromagnetic brake 65 for transmitting the rotation of a timing pulley 63 that is locked to the output shaft of the electric motor 61 to a parallel cam to be described later. A rotation transmitting section 66 having a rotation transmitting section 66 is arranged. A return conveyor 67 is disposed to pass through the lower part of the intermittent/free conveyance unit 19. A geared motor 68 is provided below one end of the return conveyor 67, and a chain 70 is connected to a sprocket provided coaxially with a pulley 69 at one end of the return conveyor 67 and a sprocket provided to the output shaft of the geared motor 68. is suspended. In addition, the return conveyor 67 has a conveyor belt 111 with pulleys 69 and 112,
It is suspended surrounding 112... Two pallet carriages 86, 86 are arranged in parallel on the frame 60. A roller 71 for carrying in pallets is rotatably supported at a pallet carrying part above the return conveyor 67 (upper right part in FIG. 8) by a lever 73 that swings about a fulcrum 72. Further, a tension spring 74 is locked between the frame and one end of the lever 73 on the side where the roller 71 is not supported. A chain 77 is connected to the sprocket provided on the output shaft of the roller 71 via sprockets provided on the respective output shafts of a high speed geared motor 75 and a low speed geared motor 76 that rotate the roller 71 at high or low speed. It is suspended. Further, in the pallet unloading section (upper left in FIG. 8), a roller 78 for transporting the pallet to the next unit is rotatably supported by a lever 80 that swings about a fulcrum 79. A tension spring 81 is locked between the end of the lever 80 on the side where the roller 78 is not pivotally supported when viewed from the fulcrum 79 and between the lever 80 and the frame. A chain 83 is suspended between a sprocket provided on the shaft of the roller 78 and a sprocket of a low-speed geared motor 82.
A lever 7 is located above the ends of the levers 73 and 80.
Stop pin 8 that limits the swing range of 3,80
4,85 are provided. The pallet 15 is mounted on the opposing upper portions of the pallet carriages 86, 86.
The running groove 8 into which the running roller 56 fits and runs
7 and 87 penetrate from the carry-in side to the conveyance side. A driving shaft 88 is rotatably attached to the pallet carriages 86, 86 via a bearing 89, penetrating through the pallet carriages 86, 86, at the center of the pallet carriages 86, 86. A timing pulley 92 on which a timing belt 91 is suspended between a timing pulley 90 attached to the output shaft of the rotation transmission section 66 is attached to one outer end of the pallet traveling platform 86 of the driving shaft 88, and a timing pulley 92 is attached to the other end of the pallet traveling platform 86 of the driving shaft 88. A spur gear 93 is attached. On both sides of this spur gear 93, there are spur gears 94 that mesh with and rotate with the spur gear 93,
95 are mounted on the outside of the pallet carriage 86 to cam shafts 96 and 97 which are located inside the pallet carriages 86 and 86, respectively, and rotate parallel cams to be described later. The reason why the cam shafts 96 and 97 are arranged on both sides of the driving shaft 88 is to secure an intermittent transfer area that is longer than the length of the pallet 15. One cam shaft is sufficient. It goes without saying that when there are two cam shafts, the shaft spacing is an integral multiple of the roller pitch. In addition, the cam shafts 96 and 97 have parallel cams 98 and 98, respectively.
is attached so as to slide in contact with two follower rollers 58 and 59. As a first embodiment, a parallel cam 9 is used in which the follower rollers 58 and 59 are fed one pitch with each 1/2 rotation of the cam shafts 96 and 97.
8 will be explained with reference to FIG. The parallel cam 98 is centered around the cam shaft 96, and has a feeding portion S on one side for transporting the follower rollers 58, 59 in the direction of arrow A, and a stop portion E for restricting the movement of the follower rollers 58, 59. The other side has a relief portion D during the movement of the follower rollers 58, 59. The parallel cam 98 is the cam shaft 9
The rollers 6 and 97 are respectively symmetrically secured to the follower rollers 58 and 59 of the pallet 15 at positions spaced apart from each other about the shafts 96 and 97 for the cam.

Next, the operation will be explained. When the entire power source (not shown) is turned on, the return conveyor 16 of the intermittent/free conveyance units 19, 19, . . . begins to transfer the pallet 15 from the return lifter 20 side to the starter lifter 18 side. When the power is turned on, the starter lifter 18
Auxiliary conveyors 35 and 36 on one side rotate in the directions of arrows, and the pallet 15 conveyed from the return conveyor 16 is transferred to the auxiliary conveyor 36. When the pallet 15 is transferred to the auxiliary conveyor 36, a detection signal from a photoelectric or limit switch detection means (not shown) causes the geared motor 27 attached to the lifting platform 24 to rotate, rotating the belt 29, and moving the pallet 15 on the auxiliary conveyor 36. The pallet 15 is transferred to the belt 29 of the lifting platform 24, and the belt 2 is moved by a detection signal from a photoelectric or limit switch (not shown) when the pallet 15 reaches a fixed position.
Stop the rotation of 9. When the belt 29 stops, the air cylinder 25 operates to raise the lifting platform 24, and in response to a detection signal from the upper end detection means (not shown) of the lifting platform 24, the operation of the air cylinder 25 is stopped and the lifting platform 24 stops rising. let Said lifting platform 2
4, the geared motor 27 attached to the lifting table 24 rotates in reverse, and the belt 29 transfers the pallet 15 onto the belt 41 of the auxiliary conveyor 35. A detection signal from a means (not shown) for detecting that the pallet 15 has reached a predetermined position on the belt 41 of the auxiliary conveyor 35 causes the air cylinder 25 to operate and lower the elevator platform 24, so that the elevator platform 24 reaches the lower end. The operation of the air cylinder 25 is stopped by a detection signal from a means (not shown) for detecting that the pallet has reached the next pallet 15, and the geared motor 38 of the auxiliary conveyor 36 is rotated to move the next pallet 15.
transfer. The starter lifter 18 repeats the above-described operation and transfers the pallet 15 to the working section of the intermittent/free conveyance unit 19.

Traveling rollers 56 provided on both sides of the pallet 15 transferred from the auxiliary conveyor 35 to the intermittent/free conveyance unit 19 move the pallet traveling platform 8
6 and 86 to prevent the pallet 15 from floating up from the pallet carriage 86 and to make the movement of the pallet 15 smooth. Further, the traveling rollers 56 provided on the lower end surfaces of the lower projections 55 at both ends of the pallet 15 slide and rotate on the inner surface of the pallet traveling base 86 to prevent the pallet 15 from rolling. The pallet 15 transferred to the pallet carriage 86 is
Lever 73 urged upward by tension spring 74
The peripheral surface of the roller 71 provided on the pallet 15
It is frictionally engaged with the lower end surface of the central lower protrusion of and is freely conveyed by the rotation of the roller 71. roller 7
1 is configured such that its rotational speed can be changed by switching between a high-speed geared motor 75 and a low-speed geared motor 76, and the pallet 15 transferred to the pallet traveling table 86 is rotated at a relatively low speed by the rotation of the low-speed geared motor 76, and is rotated by a parallel cam 98. When the follower rollers 58 and 59 of the heparet 15 are in contact with each other, the drive of the low-speed geared motor 76 is released by a detection signal from a contact detection means (not shown) between the parallel cam 98 and the rollers 58 and 59, and the pallet is rotated. Due to the relative speed between the moving speed and the rotational speed of the parallel cam, a high-speed gear is set so that the roller 59 moves faster than the rotational speed of the cam 98 in order to avoid interference between the contact portion of the roller 59 and the cam 98. The drive of the motor 75 is started, the roller 71 moves at high speed, and the conveyance of the pallet 15 is regulated by the rotation of the parallel cam 98. This state will be explained with reference to FIG. 11A shows a state in which the pallet 15 is being conveyed in the direction of the parallel cam 98 by the low speed rotation of the roller 71, and FIG.
9 is in contact with the parallel cam 98, and FIG.
This figure shows the state in which it is engaged with the second parallel cam 98. The electric motor 61 (see FIG. 8) rotates at a constant speed when the power is turned on, and the rotation of the electric motor 61 is transmitted to the rotation transmission section 66 and brought into contact with the follower rollers 58 and 59 of the pallet 15. Up to this point, the electromagnetic brake 65 is operating and no signal is transmitted to the driving shaft 88. In response to the contact detection signal between the parallel cam 98 and the rollers 58 and 59, the operation of the electromagnetic brake 65 is released and the electromagnetic clutch 64 is operated to transmit the rotation of the electric motor 61 to the driving shaft 88. The rotation of the driving shaft 88 is caused by spur gears 93,9.
4 and 95 to the cam shafts 96 and 97. Here, the reference number of the parallel cam that comes into contact with the follower roller 58 is 98A, and the follower roller 59 is
The reference numeral 98B will be used to explain the parallel cam that comes into contact with the cam. Due to the contact between the parallel cam 98A and the follower roller 58, and the contact between the parallel cam 98B and the follower roller 59, the rotation of the roller 71 becomes high as described above, and the circumferential surface of the roller 71 and the central lower projection of the pallet 15 are brought into contact with each other. The lower end surface slips, and the follower rollers 58 and 59 are pressed by the parallel cams 98A and 98B, respectively, and the follower roller 5 is pressed by the rotation of the cam shaft 96 in the direction of the arrow.
8 and 59 move to the left in FIG. 11 while rotating the circumferential surfaces of the parallel cams 98A and 98B, and connect the follower rollers 58 and 59 and the parallel cams 98A and 98B.
engagement is completed. Incidentally, appropriate detection means is provided so that the rotation of the roller 71 is stopped when the engagement between the follower rollers 58, 59 of the pallet 15 and the parallel cams 98A, 98B is confirmed.

In FIG. 11, the follower roller 58 of the pallet 15,
59 and the parallel cams 98A, 98B engage, and when the parallel cams 98A, 98B further rotate, the pallet 15 is stopped because the follower roller 59A is sliding in contact with the stationary portion E of the parallel cam 98B. (See Figure 12A). parallel cam 98
When A and 98B continue to rotate and reach the position shown in FIG.
Pallet 15
begins to be transferred in the direction of the arrow. FIG. 12C shows a state in which the pallet 15 is being transferred, and the follower roller 58A is sliding in contact with the feeding portion S of the parallel cam 99A, and the pallet 15 is being moved in the direction of the arrow. FIG. 12D shows that the follower roller 58A has reached the relief portion D of the parallel cam 98A and the pallet 1
5 by one pitch, that is, the 12th pitch of the follower roller 58A.
The follower roller 59A moves to the position shown in Figure A, and the follower roller 58B slides into contact with the stationary portion E of the parallel cam 98A, completing the transfer of the pallet 15. The relationship between the follower roller 59 and the parallel cam 98B is also similar to that between the follower roller 58 and the parallel cam 98A.
It operates in the same manner as in the relationship between the pallets 15 and 15, and the pallets 15 are sequentially and intermittently transferred. A parallel cam 98 is attached to cam shafts 96 and 97 spaced apart in the same phase, and the cam shaft 97 is attached to a spur gear 93 attached to a driving shaft 88.
It rotates in the direction of the arrow by the spur gear 95 that meshes with.

The follower rollers 58, 59 and the parallel cam 9
When the engagement with the lever 80 is released, this release is detected by an appropriate detection means (not shown), and the detection signal causes the low-speed geared motor 82 to rotate, and the lever 80, which is urged upward by the tension spring 81, rotates. A roller 78 pivotally supported rotates, and the peripheral surface of this roller 78 slides against the lower end surface of the central lower projection of the pallet 15 to convey the pallet 15. The pallet 15 is made up of the appropriate number of intermittent/free conveyance units 19 mentioned above.
It reaches the return lifter 20 through the. The return lifter 20 is the starter lifter 1 described above.
8, but the path of the pallet 15 is reversed. The elevating table 24 is located at the upper end by an air cylinder 25, and the belt 29 of the elevating table 24 is in the same position as the belt 41 of the auxiliary conveyor 35. The pallet 15 is transferred from the roller 78 of the intermittent/free conveyance unit 19 onto the belt 41 of the auxiliary conveyor 35, and the pallet 15 is transferred to the belt 41 of the auxiliary conveyor 35 by appropriate detection means (not shown).
1, the geared motor 37 rotates based on the detection signal, and the belt 41 moves to the fifth position.
The pallet 15 is rotated in the direction of the arrow shown by the broken line in the figure, and the pallet 15 is transferred onto the belt 29 of the lifting table 24. Detecting that the pallet 15 has been transferred onto the belt 29 of the lifting table 24 by an appropriate detection means (not shown),
This detection signal causes the geared motor 27 attached to the lifting table 24 to rotate, the belt 29 to rotate, and the pallet 15 to be transferred onto the lifting table 24.
When the arrival of the pallet 15 at a predetermined position is detected by a suitable detection means (not shown), the rotation of the geared motor 27 is stopped, and the air cylinder 25 is operated to lower the elevator platform 24. Appropriate detection means (not shown) detects that the lifting platform 24 has reached the lower end, and the geared motor 2
7 and rotate the belt 29, pallet 1
5 onto the belt 42 of the auxiliary conveyor 36. The conveyance of the pallet 15 onto the belt 42 of the auxiliary conveyor 36 is detected by an appropriate detection means (not shown), and the geared motor 38 is rotated to rotate the belt 42 in the direction of the dashed arrow to intermittently transfer the pallet 15. -Transfer onto the return conveyor 67 of the free conveyance unit 19. Here, the geared motor 27 and the geared motor 38 are configured to stop their rotation in response to a detection signal from appropriate detection means (not shown) indicating that the pallet 15 has been transferred to the next conveyor. Lifting platform 2
4, when the pallet 15 is transferred from the belt 29 of the lifting table 24 onto the belt 42 of the auxiliary conveyor 36, the air cylinder 25 is operated and raised to wait for the transfer of the next pallet 15 at the upper end position. It is being done.

Although the path of the pallet 15 having the follower rollers 58 and 59 has been explained above, the intermittent and
An embodiment in which a writing instrument cap tightening tool is attached to the free conveying unit 19 as a tooling unit will be described with reference to FIG. Pallet traveling platform 8
A tooling device 99 is disposed on the same plane as the tool 6, and a hopper 101 for storing the writing instrument cap 100 and an air cylinder 1 for pushing out the writing instrument cap 100 are disposed on the upper surface of the tooling device 99.
02 rods 103 are arranged. A connecting rod 1 is attached to the end of the rod 103 of the air cylinder 102.
04 is attached so as to be connected to the end of a pusher 105 that pushes out the writing instrument caps 100 one by one from the hopper 101. The pusher 105 also has a guide hole 1 provided through the tooling device 99 to facilitate positioning.
It is designed to be able to fit loosely and slide inside 06.
Further, on the upper end surface of the pallet carriage 86 at a position far from the tooling device 99 (on the left side in FIG. 13), there is a receiving plate 108 with which the rear end of the writing instrument main body 107 comes into contact.
is installed. In this state, the follower roller 5
While the pallet 15 is stopped due to the contact and sliding movement between the cams 8 and 59 and the stationary portions D of the parallel cams 98A and 98B, the air cylinder 102 operates to fit the writing instrument cap 100 into the writing instrument main body 107, and press the pusher. 105 is operated to retreat to the retreat position. If the working time of the tooling unit is longer than the stopping time of the pallet 15 due to the rotation of the parallel cam 98, a signal indicating that the pallet 15 has reached the stop position is detected by an appropriate detection means (not shown), and an electromagnetic The clutch 64 is released and the electromagnetic brake 65 is operated to prevent the rotation of the electric motor 61 from being transmitted to the driving shaft 88, and the electromagnetic brake 65 is activated by the touring unit's work completion signal.
is released, the electromagnetic clutch 64 is operated, the rotation of the electric motor 61 is transmitted to the driving shaft 88, the rotation of the parallel cam 98 is restarted, and the pallet 1
It is also possible to continue the intermittent transfer of 5 times.

FIG. 14 shows the relationship between the parallel cam 109 and the follower rollers 58 and 59 as an example in which the pallet 15 is moved two pitches (2P) with one rotation of the cam shaft. As another example, pallet 15 is made 3 pitches (3P) by 1/2 rotation of the cam shaft.
When moving the parallel cam 110 in FIG.
This is shown in relation to the follower rollers 58 and 59. By appropriately selecting the shape of the parallel cam as described above, the relative relationship between the rotation speed of the cam shaft and the pallet movement pitch can be selected.

[Effects] Since the present invention has the above configuration, intermittent pallet transfer can be performed with high precision and at high speed.
Since intermittent transfer and free transfer can be performed in the same unit, an appropriate number of intermittent and free transfer units can be connected in the overall configuration, and process changes can be easily handled. Furthermore, by making the conveyance path on the return side of the pallets free conveyance, the pallets can be returned at high speed.

[Brief explanation of drawings]

Figures 1 and 2 show a conventional intermittent transfer device, Figure 3 is a perspective view of the overall appearance, Figure 4 is an explanatory view of the whole, and Figure 5
Figure 6 is a vertical sectional view of the starter lifter and return lifter, Figure 7 is a partially cutaway perspective view of the pallet, Figures 8 and 9 are vertical sectional views of the intermittent/free conveyance unit, and Figure 10 is a vertical sectional view of the intermittent/free conveyance unit. An explanatory diagram of the parallel cam, Fig. 11 is an explanatory diagram of the initial engagement of the parallel cam and the follower roller, Fig. 12 is an explanatory diagram of the intermittent transfer between the parallel cam and the follower roller, and Fig. 13 is an intermittent/free conveyance unit. 14 and 15 show other embodiments of the parallel cam. 15... Pallet, 16... Return conveyor, 17, 86... Pallet traveling platform, 18... Starter lifter, 19... Intermittent/free conveyance unit, 20... Return lifter, 55... Lower projection, 56... Traveling roller, 57... central lower projection, 58, 59... follower roller, 71,
78...Roller, 73, 80...Lever, 87
... Running groove, 88 ... Driving shaft, 9
3,94,95...Spur gear, 96,97...Cam shaft, 98,98A,98B,109,1
10...Parallel cam.

Claims (1)

[Claims] 1 At least one pallet intermittent/free conveyance unit is arranged in which an intermittent/free conveyance section for sending pallets and a free conveyance return conveyor for returning the pallets are arranged vertically, and The pallet intermittent/free conveyance device has a direction changer for changing the direction of the pallet at both ends of the conveyance unit, and the pallet intermittent/free conveyance section corresponds to the pallet intermittent/free conveyance section. An intermittent conveyance section that intermittently conveys the pallet in synchronization with the operation of the disposed tooling unit, and a free conveyance section that conveys the pallet without being restricted by the operation of the tooling unit are connected to the upper surface of the intermittent/free conveyance unit. So, with respect to the pallet feeding direction,
The free conveyance section is arranged at least upstream of the intermittent conveyance section disposed at the middle part of the upper surface of the intermittent/free conveyance unit, and each of the direction changer, the intermittent/free conveyance section, and the return conveyor has a driving source. An intermittent/free pallet conveying device featuring: