JPS6136443Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a conveyor pallet that runs on a conveyor frame, automatically stops at a predetermined position, and transports parts, jigs, etc. by loading and unloading them. The objective is to provide a pallet with high strength and excellent durability.

This type of conveyor pallet is installed so that it can run freely on a conveyor frame that makes up the pallet track, and a sprocket wheel that is rotatably attached to a fixed shaft provided at the bottom of the pallet via a clutch is connected to the conveyor frame. When running, the clutch is fixed and the sprocket wheel is fixed non-rotatably to the fixed shaft to transmit the propulsive force from the drive chain. The pallet is made to travel together with the pallet, the clutch is released at a predetermined position, the sprocket wheel is allowed to rotate freely relative to the fixed shaft, and the propulsion from the drive chain is cut off to stop the pallet from traveling. ing.

By the way, the clutches installed in the conventional pallets are those that utilize frictional force or those that utilize mechanical engagement. For example, in a pallet with a mechanical clutch, as shown in Fig. 1, parts, jigs, etc. are rotatably mounted on a fixed shaft e constructed on a support frame b of a mounting table a. Place the release lever e on the boss part a' of the wheel a,
One end of this is pivotally attached to the support frame b, and a return spring f is interposed between the upper surface of the free end side of the release lever e and the mounting table a, so that the release lever e is always given downward elasticity. It has a structure in which a stopper g, which is biased and attached to the lower surface of the release lever e, is engaged with a pawl h formed on the circumferential surface of a boss portion a' of a sprocket wheel a. This pallet is mounted on a conveyor frame (not shown) so that it can run freely, and is attached to a sprocket wheel a.
A portion of the conveyor is engaged with a drive chain i disposed along the conveyor frame. Normally, the pallet g is locked to the pawl h of the sprocket wheel a, and the sprocket wheel a is fixed non-rotatably to the fixed shaft c, and the propulsive force from the drive chain i is transmitted to the fixed shaft e. and the pallet moves.
When the tip of the release lever e is pushed up at a predetermined position and the pallet g is removed from the claw h, the sprocket wheel a rotates freely relative to the fixed shaft e, and the propulsive force from the drive chain i acts on the fixed shaft c. The pallet will stop.

In the pallet of the above configuration, the sprocket wheel a is reliably fixed by the engagement between the pallet g and pawl h as the release lever e swings, and the propulsion force transmission capacity is high, making it possible to transport heavy objects with large loads. However, with the clutch having the above structure, the clutch operation is performed by moving the pallet pawl g up and down to engage or disengage the pawl h, thereby transmitting and transmitting the propulsive force from the sprocket wheel a to the fixed shaft c. Since this is a device that causes non-transmission, even if the amount of swing of the release lever e is increased, the vertical movement of the stopper g is large, so the pallet g cannot be provided with a large protrusion, and the clutch operation of the pallet g is affected. Due to the accompanying wear, the locking on the pawl h became incomplete in a short period of time, making it impossible to fix the sprocket wheel a, which resulted in the drawback that it became possible to lower the sprocket wheel.

In view of the above-mentioned drawbacks of the prior art, this invention has been improved and eliminated, and the pallet is rotated in conjunction with the swinging of the release lever to perform the cracking action.

The configuration of this invention will be described below with reference to embodiments shown in the drawings.

In Figures 2 and 3, 1 is a mounting table on which parts, jigs, etc. are placed, 2 and 2 are parallel support frames that support the mounting table 1, and there is a space between both support frames 2 and 2. These rolling rollers 5, 5... are fixed with axles 3, 4 passing through them in the front and rear, and rolling rollers 5, 5... are attached to each protruding end so as to be able to roll freely via bearings 6, 6... are installed in the rail grooves 8, 8 of the parallel conveyor frames 7, 7 constituting the track, and roll within the rail grooves 8, 8, so that the pallet travels while being guided by the conveyor frames 7, 7. 9 is a fixed shaft suspended horizontally in the center between both support frames 2, 2; 10 is a sprocket wheel rotatably mounted on the fixed shaft 9 via a bearing 11; a part of the sprocket wheel is attached to the conveyor frame 7; It is connected to a drive chain 12 which is arranged in parallel along the line and circulates at a constant speed. Also, the boss portion 13 of the sprocket wheel 10
Several pawls 14 are integrally formed at equal intervals on the circumferential surface of the sprocket wheel 10 to engage with stoppers 15, which will be described later, to prevent the sprocket wheel 10 from rotating. 16
is a swinging arm that is disposed along the running direction between the mounting table 1 and the boss portion 13 of the sprocket wheel 10, and whose rear end is pivotably connected to the support frame 2. The first return spring 1 is compressed and interposed between the movable arm 16 and the free end side end.
7, the downward elastic force is constantly applied. Further, the lower surface of the swing arm 16 facing the boss portion 13 is cut out in an arc shape so that a large swing amount can be obtained without interfering with the boss portion 13 and the pawl 14.
Reference numeral 18 denotes a pivot provided protruding from the side surface of the central portion of the swing arm 16, and the stopper 15 is rotatably attached to this pivot 18. The stopper 15 integrally has arms 19, 20, 21 extending in three directions, and a stopper pawl 22 formed at the end of the arm 19 extending downward engages the pawl 14 of the boss portion 13 of the sprocket wheel 10.
The sprocket wheel 10 is stopped from rotating. Further, the arm 20 extending rearward comes into contact with the lower surface of the mounting table 1, and regulates the rotation range of the stopper 15.
The remaining arm 21 extending forward is free, and a second return spring 23 compressed between the upper surface side of the arm 21 and the mounting table 1 constantly applies rotational force in the counterclockwise direction (clutch fixing direction). The stopper pawl 22 is pressed against the boss portion 13 side and the pawl 14
and fix the sprocket wheel 10 to the fixed shaft 9.
fixed in a non-rotatable manner. In addition, stopper 1
The lengths of the two arms 19 and 20 of No. 5 are set so that when the stopper claw 22 comes into contact with the boss portion 13, the other arm 20 comes into contact with the lower surface of the mounting table 1. Reference numeral 24 designates a release lever for releasing a clutch, which is disposed at the lower part of the free end side of the swing arm 16 and whose rear end is swingably attached to the axle 3. A push lever 25 is attached to the front of the pivot point, and the lever 25 is attached to the rear of the lever. A third return spring 26 compressed between the end and the swinging lever 16 is always biased clockwise, so that the upper end of the push-up rod 25 is always in contact with the lower surface of the swinging lever 16. ing. When the tip of the release lever 24 is pushed upward and swung clockwise, the push-up rod 25 that is integrated therewith pushes up the free end side of the swing lever 16 against the first return spring 17. , along with this,
The pivot 18 rises, and the stopper 15
rotates clockwise against the second return spring 23, and the stopper pawl 22 engages the pawl 1 of the boss portion 13.
4, the boss portion 13 and sprocket wheel 10 rotate freely relative to the fixed shaft 9, and the propulsion force from the drive chain 12 is no longer transmitted. When the upward force on the release lever 24 is removed, the first
The return spring 17 causes the swing lever 16 and the release lever 24 to return to their swing, and the second return spring 23 returns the stopper 15.
The stopper pawl 22 engages with the pawl 14 of the boss portion 13,
The sprocket wheel 10 is fixed so as not to rotate, and the driving force from the drive chain 12 is transmitted to the fixed shaft 9, causing the pallet to travel. Note that the first return spring 17 is set so as to always overcome the elasticity of the third return spring 26.

To explain the operation of the pallet with the above configuration, in a normal state where no upward force is applied to the tip of the release lever 24, the swing lever 16 and the stopper 1
5 is held in the clutch fixed position by the first return spring 17 and the second return spring 23, and the stopper pawl 22 of the stopper 15 is engaged with the pawl 14 of the boss portion 13, and the sprocket wheel 1
0 is fixed non-rotatably to a stationary roller 9, and the pallet is guided by conveyor frames 7, 7 by transmitting the propulsive force from the drive chain 12, and conveys parts, jigs, etc. When the tip of the release lever 24 is pushed upward by a cam or the like at a predetermined position, the swing lever 16
and the stopper 15 is the first return spring 1
7 and the second return spring 23 in the clutch release direction, the stopper pawl 22 of the stopper 15 is disengaged from the locking pawl 14, the boss portion 13 becomes free, and the sprocket wheel 10 is released.
rotates freely relative to the fixed shaft 9, the propulsive force from the drive chain 12 is not transmitted to the fixed shaft 9, the pallet stops at that position, and parts and jigs on the mounting table 1 cannot be removed or transferred. etc. will be done. When the force to push up the release lever 24 disappears, the stopper pawl 22 of the stopper 15 engages with one of the pawls 14 of the rotating boss portion 13 again, preventing the rotation of the pawl 14 and causing the sprocket wheel 10 to move. The pallet is fixed so as not to rotate, and the driving force from the drive chain 12 is transmitted to make the pallet travel again.

With the pallet having the above configuration, the stopper pawl 22 of the stopper 15 is connected to the boss portion 13 when the clutch is fixed.
Since the rotation of the boss portion 13 is prevented by mechanically locking the stopper pawl 22 and the pawl 14, the fixing force is strong, and even if a large load is applied, no slipping occurs between the stopper pawl 22 and the pawl 14. Since the propulsion force from the drive chain 12 is reliably transmitted, heavy objects can also be transported.
Further, since the movement of the stopper 15 in conjunction with fixing or releasing the clutch is performed by rotating counterclockwise or clockwise around the pivot shaft 18, the rotation range of the stopper 15 is limited even if the amount of swing of the swing lever 16 is small. Since the stopper pawl 22 can be made larger and the stopper pawl 22 can be made longer, it can be used for a long period of time even if the stopper pawl 22 is worn out due to clutch operation.

Furthermore, in addition to pushing up the release lever 24,
When an unexpected external force or overload is applied, such as when an obstacle falls into the rail groove 8 and gets caught in the roller 5, causing the pallet to stop, the pawl 14 of the boss portion 13 of the sprocket wheel 10 Therefore, the stopper 15 and the swing arm 16 remain integrated and the first
and rotates upward against the second return springs 17 and 23, and due to the regulating action of the arm 20 of the stopper 15, the stopper 15 is rotated clockwise in FIG. 2 against the second return spring 23. This forces the stopper pawl 22 to engage the pawl 14 of the boss portion 13 of the sprocket wheel 10.
This operation is repeated to keep the sprocket wheel 10 spinning and protect the pallet and equipment from damage during overload. This overload amount is the first and second return springs 17, 2
It can be set by 3.

As explained above, this idea consists of a sprocket wheel rotatably mounted on a fixed shaft suspended between parallel support frames that support a mounting table on which parts, jigs, etc. are placed, and a sprocket wheel. A swinging arm is swingably attached to a support frame above the boss part with one end as a fulcrum, and is constantly biased toward the boss part via a first return spring, and a part of the swinging arm is Rotatably pivoted,
A part of it has a stopper pawl that engages and disengages with a pawl formed on the circumferential surface of the boss part of the sprocket wheel, and the other position is in contact with the lower surface of the mounting table so that the swinging arm can move around the sprocket wheel. The stopper has an arm portion that rotates the stopper pawl in the disengagement direction when it rotates in the direction away from the boss, and the stopper has a second return spring that presses and urges the stopper pawl in the engagement direction, and the swing arm has a free movement. It is pivotally attached to the support frame at the lower end side, and is always held at the return position by the action of the third return spring.
In this return state, a part of the swinging arm comes into contact with the swinging arm to restrict the swinging arm from rotating in a direction approaching the sprocket wheel boss, and at a predetermined time, the swinging arm is moved toward the sprocket wheel boss. Since it is equipped with a release lever that rotates the stopper pawl in the direction away from the stopper pawl in the disengagement direction, it is possible to increase the amount of engagement of the pawl clutch and improve durability. In addition to the stopping action by the lever, for example, when an obstacle or the like has fallen into the rail groove that serves as a guide path for the pallet to travel, and the rollers get caught in the obstacle or the like and the pallet is stopped by an unexpected external force, etc. The claw of the boss part of the sprocket wheel pushes up the swinging arm together with the stopper in a direction away from the boss part against the first and second return springs,
As a result, the stopper is rotated in the detachment direction by the action of the arm portion of the stopper that comes into contact with the lower surface of the mounting table, and this can be repeated to idle the sprocket wheel, thereby protecting the entire device from overload. This overload amount can be set using the first and second return springs. Therefore,
Pallets and equipment can be protected from damage.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the structure of a pawl clutch installed on a conventional pallet, Fig. 2 is a vertical side view showing the structure of the pawl clutch type pallet for conveyance according to the present invention, and Fig. 3 is a longitudinal sectional front view of the same pallet. It is. 1... Placement table, 2... Support frame, 9... Fixed shaft, 10... Sprocket wheel, 13...
Boss part, 14...Claw, 15...Stopper, 16...
... Swinging arm, 17... First return spring, 18... Pivot, 22... Stopper claw, 23...
...Second return spring, 24...Release lever, 26...Third return spring.

Claims (1)

[Scope of utility model registration request] A sprocket wheel is rotatably mounted on a fixed shaft suspended between parallel support frames that support a mounting table on which parts, jigs, etc. are placed, and a support frame above the boss of the sprocket wheel. A swinging arm is mounted so as to be swingable with one end as a fulcrum, and is constantly urged toward the boss via a first return spring; It has a stopper pawl that engages with and disengages from a pawl formed on the circumferential surface of the boss portion of the sprocket wheel, and has a stopper pawl that engages with and disengages from the pawl formed on the circumferential surface of the boss portion of the sprocket wheel, and the swing arm contacts the lower surface of the mounting table at another position so that the swinging arm engages with and disengages from the pawl formed on the circumferential surface of the boss portion of the sprocket wheel. The second
The stopper, which presses the stopper pawl in the engagement direction with a return spring, is pivotably pivoted to the support frame at the lower part of the free end of the swing arm, and is always returned to its original position by the action of a third return spring. When the sprocket wheel is held in this position and in this return state, a part thereof comes into contact with the swinging arm to restrict the swinging arm from rotating in the direction approaching the sprocket wheel boss portion;
A pawl clutch type pallet comprising a release lever that rotates a swinging arm in a direction away from a sprocket wheel boss portion to rotate a stopper pawl in a detaching direction at a predetermined time.