JPS6129285B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pallet direction changing device in a conveyor pallet transfer device.

Conventionally, changing the direction of pallets when transferring pallets between conveyors was performed using a separate drive, and the drive source had to be installed in the pallet storage device, making it difficult to take up structural space and requiring a separate control device. However, it also had the disadvantage of requiring a transmission tube for control.

The present invention solves the above-mentioned conventional drawbacks and provides a pallet direction changing device that changes the direction of a pallet using one drive source of the pallet transfer device.

An embodiment of the present invention will be described below based on the drawings. In Figures 1 to 4, reference numeral 1 denotes a pallet that is transferred from a first free flow conveyor 2 to a second free flow conveyor 3, which are arranged so that their conveying directions are perpendicular to each other. A detected object 4 is attached. Reference numeral 5 denotes a conveyance chain provided in the pallet storage and delivery direction on the pallet storage device main body 6, which is suspended between a conveyance sprocket 8 fixed to the drive shaft 7 and a separately provided driven sprocket 9, and is used to carry out the loading. It is guided and supported by a chain guide 10 that applies the load to the object and also serves as a guide. Reference numerals 11 and 12 denote first and second bevel gears provided on the drive shaft 7, each of which has a built-in one-way rotation clutch 13 so as to rotate the conveyance chain 5 only in the direction of arrow A. 14 is the bevel gear 11,
12, the bevel gear 1 is a drive bevel gear meshing with the bevel gear 1;
1, 12 and the one-way rotation clutch 13 constitute a one-way rotation mechanism. Reference numeral 15 denotes a stopper shaft that moves up and down within a stopper guide 16 provided in the main body 6 of the pallet storage device, and is located at a pallet stopping position where it is pushed upward by a spring 17 and prevents the passage of the pallet 1 during the first pallet storage. When the pallet storage device main body 6 turns 90 degrees (described later), its cam follower 18 engages with a cam 19 fixed to the base 20 and is pulled down against the spring 17 to move the pallet 1 to the pallet passing position. These components constitute a stopper lifting mechanism. Reference numeral 21 denotes a rotation center shaft attached to the base 20, and the shaft 21 is the center of rotation of the pallet storage device main body 6.
The pallet storage device main body 6 is supported via a bearing 23 of a housing 22 fixed to the
The pallet storage device main body 6 can pivot around the pivot shaft 21. 24 is base 2
The drive gear 25 rotated by the motor 24 is arranged concentrically with the rotation center shaft 21, and the drive gear 25 is connected to the drive shaft 21. gear 1
It is meshed with a planetary gear 27 that is slidably engaged with the rotating shaft 26 of No. 4 in the axial direction. Further, the rotating shaft 26 is rotatably supported by a bearing 28 fixed to the pallet storage device main body 6 via a bearing 29. Further, the lower surface of the bearing 28 is configured as a friction shoe 30, and a friction disk 31 is interposed between the lower surface of the bearing 28 and the upper surface of the planetary gear 27, and the planetary gear 27 has a friction torque adjustment nut screwed onto the tip of the rotating shaft 26. 32 is pressed against the friction disk 31 via a spring 33 in a settable pressing force, thereby forming a friction clutch. Therefore, if the drive gear 25 rotates forward or backward while the pallet storage device main body 6 is restricted in position by the stoppers at both end positions of direction change, the friction clutch slips and the planetary gear 27 rotates in the reverse or forward direction. Shaft 26
The driving gear 14 rotates in reverse or forward direction. However, in other cases, that is, when the planetary gear 27 receives a force due to forward or reverse rotation of the drive gear 25 on the side where the pallet storage device main body 6 is not subject to position restriction by the stopper, the planetary gear 27
7 is stopped from rotating by the frictional force of the friction clutch, and makes a planetary movement left and right as the drive gear 25 rotates, and as a result, the pallet storage device main body 6 is rotated left and right. Reference numerals 34 and 35 are shock absorbing devices provided at both end positions of the direction change for absorbing shock during turning and regulating the stop position, and correspond to the stoppers for the pallet storage device main body 6, for example, the pallet storage device main body 6. bearing 28
By this contact, the pallet storage device main body 6 is positioned at both ends of the direction change.

Next, its operation will be explained. Assume that the main body 6 of the pallet storage device is now in the state shown in FIG. 1, in which the pallet 1 is stored from the conveyor 2. The state in which the bearing 28 is in contact with the shock absorbing device 34 at this time is shown in FIG. When the pallet 1 is fed from the free flow conveyor 2, the input signal causes the electric motor 24 with a reduction gear to rotate in the reverse direction, and the drive gear 25 rotates counterclockwise in the direction of arrow B. However, since the bearing 28 is in contact with the shock absorbing device 34, a torque greater than the set torque by the spring 33 acts on the planetary gear 27, causing the friction clutch to slip and disengage, causing the planetary gear 27 to rotate around its axis and rotate. The drive bevel gear 14 rotates in the clockwise direction of arrow D via the shaft 26. At this time, the driving bevel gear 1
Among the bevel gears 11 meshing with the bevel gears 4, only the rotation of the first bevel gear 11 is transmitted to the drive shaft 7 via the one-way rotating clutch 13, and the conveying chain 5 rotates in the direction of arrow A to store the pallet 1. . Also, at this time, since the stopper lifting mechanism cam follower 18 is detached from the cam 19, the stopper shaft 15 is returned by the spring 17 and is raised to the pallet stopping position shown in FIG. 3, so that it functions as a stopper.
Stop pallet 1. At the same time, the detector 36 detects the detected object 4, stops the electric motor 24 with a reduction gear, and rotates it in the forward direction. Therefore, the drive gear 25
rotates clockwise in the direction of arrow C. At this time, the friction clutch is activated and the planetary gear 27 makes a planetary motion in the direction of arrow C as the drive gear 25 rotates. Therefore, the pallet storage device main body 6 turns 90 degrees to the right, and at the end of the turn, the shock is absorbed by the shock absorbing device 35, and its position is regulated and it stops. During this time, the stopper lifting mechanism is in the middle of its rotation, and the stopper shaft 15 is lowered by the action of the cam 19, so that the pallet 1 is ready to be fed out. Furthermore, since the bearing 28 of the pallet storage device main body 6 is regulated in position by the shock absorbing device 35 at the end of the rotation, the friction clutch is disengaged as described above, the planetary gear 27 rotates around the axis, and the planetary gear 27 rotates through the rotating shaft 26. The drive bevel gear 14 rotates counterclockwise in the direction of arrow H. At this time, of the bevel gears meshing with the drive bevel gear 14, only the rotation of the second bevel gear 12 is caused by the unidirectional rotating clutch 13.
The conveyance chain 5 rotates in the direction of arrow A, which is the same direction as when storing the pallet, and sends the pallet 1 to the conveyor 3. Note that the bevel gear 11 is idly rotated by the one-way rotating clutch 13. Furthermore, when receiving a signal indicating that the pallet 1 has been reliably sent out, the electric motor 24 with a reduction gear stops and reverses, the planetary gear 27 makes a planetary motion in the direction of the arrow B, and the pallet storage device main body 6 moves in the opposite direction to that described above. The shock absorber 34 rotates and returns to the pallet storage state.
When the pallet storage device body 6 is stopped, the simultaneous detector 37 detects the return of the pallet storage device main body 6 and the electric motor 2 with a reduction gear is activated.
4 stops. During this time, the cam follower 18 of the stopper shaft 15 disengages from the cam 19 and rises, returning to the initial standby state.

In the above embodiment, the pallet is conveyed by a conveyance chain, but a belt may also be used, as long as it can convey the pallet in a free flow manner. Further, the direction change is not limited to 90 degrees.

As described above, according to the present invention, it is possible to store and send pallets and change direction with a single drive source, and the structure is simple in terms of mechanism and control.It is also economically advantageous and has a great effect on automation. It is something to do.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall plan view, FIG. 2 is a partially sectional plan view of main parts, and FIG.
The figure is a longitudinal sectional view of the main part, and FIG. 4 is a plan explanatory view of the turning mechanism. 1... Pallet, 2, 3... First and second free flow conveyor, 5... Conveyance chain, 6
...Pallet storage device main body, 11, 12...1st
and second bevel gear, 13... one-way rotation clutch, 14... drive bevel gear, 15... stopper shaft, 21... turning center shaft, 24... electric motor with reduction gear, 25... drive gear, 27... ...Planetary gear, 28...Bearing, 31...Friction disc, 34,3
5... Shock absorption device.

Claims (1)

[Claims] 1. A conveyance device that stores and sends out pallets for transferring pallets at the conveyance end of the first conveyor and the conveyance start end of the second conveyor, and a conveyance device that operates at a constant rate regardless of whether the electric motor rotates in the forward or reverse direction. a one-way rotation mechanism that allows the pallets to be conveyed in the same direction; a stopper lifting mechanism that stops the pallets fed by the conveyance device and descends after changing the direction to allow the pallets to pass; the conveyance device; the one-way rotation mechanism; and a parts storage device that has a built-in stopper lifting mechanism and can be rotated from side to side at a fixed angle around a bearing.
a drive gear having a center concentric with the bearing portion and rotated forward or reverse by an electric motor; a friction clutch whose friction transmission torque can be set using a spring; and a friction clutch which meshes with the drive gear and connects the friction clutch. When the friction clutch slips, the pallet storage device is rotated left and right around the drive gear, and when the friction clutch slips, a planetary gear that transmits rotation to the one-way rotation mechanism and a left and right rotation end of the pallet storage device are connected, respectively. 1. A pallet direction changing device comprising a shock absorbing device for absorbing shock and positioning the pallet.