JPH0344439Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pallet transfer device, and more particularly to a device for reciprocating a workpiece transfer pallet movably supported on a conveyor in a fixed stroke.

(Prior art) Conventionally, a pallet for conveying a workpiece for machining, etc. of the workpiece is sent to a work stage such as a cleaning stage installed near the conveyor, and a conveyor and a pallet are used to perform work on the workpiece or pallet. It is necessary to provide an idling conveyor between the stage and the pallet, and to reciprocate the pallets movably supported on the conveyor with a constant stroke using a pallet transfer device.

In conventional pallet transfer equipment,
-As shown in Publication No. 83322, the pallet is lifted and returned to the conveyor, and as shown in Figure 5, the left and right one
A piston rod 101 of a cylinder for constant stroke transfer is connected to a loader 100 guided and supported by a pair of guide rods 110, and pins 102 are provided on both sides of the loader 100 to engage and disengage from engaging portions 104 of a pallet 103. small cylinder 1
There was something like a forward and backward drive in 05.

In the above-mentioned conventional pallet transfer device, in addition to the fixed stroke transfer cylinder, a lift means and a pin 10 are used.
Not only are two cylinders 105 for four drives required, but also two cylinders 105 for the moving loader 100 are required.
5, the pneumatic system, hydraulic system, and control system are complicated, prone to failure, and expensive to manufacture.

(Purpose of the invention) The present invention was made in order to eliminate the above-mentioned drawbacks, and it is a pallet transfer device that has a simple mechanism but can also drive the engagement arm to open and close using a drive cylinder for constant stroke transfer. The purpose is to provide

(Structure of the invention) The pallet transfer device according to the present invention is a device for reciprocating a workpiece transfer pallet movably supported on a conveyor with a fixed stroke, and supports a movable body that moves along the movement direction of the pallet. The movable body is supported by a mechanism, and a pressing surface for the pallet is provided on the side facing the pallet of the movable body, and a pair of openable/closable arms are respectively pivotally supported on the movable body, and the movable body is provided with a pressing surface portion for the pallet, and the movable body has a pair of opening/closing arms that are pivoted on the movable body. The outer arms of the pallet can be freely switched between an engaged position where the outer arms are closed and engage with the engaging parts on both sides of the pallet and an open position where both outer arms are open. Elongated holes are provided at each end, and the pins inserted through both elongated holes are connected to the tip of the piston rod of the transfer drive cylinder, and the arm is swung to the desired position before the drive cylinder transfers the pallet in a fixed stroke. It is configured to switch.

(Effect of the invention) In the pallet transfer device of the invention, a pair of swinging open/close arms are provided on the movable body supported by the support mechanism as described above, and the inner ends of the inner arms of both arms are driven. Connected to the piston rod end of the cylinder,
Since the arm is oscillated to open and close before the drive cylinder moves the pallet in a fixed stroke, there is no need to provide a cylinder to drive both arms, and a single drive cylinder can move the pallet back and forth. The arm can be opened and closed.

Therefore, the pneumatic system, hydraulic system, and control system of the device are simplified, and the overall configuration of the device is simplified.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In this embodiment, as shown in FIG. 1, a pallet transport system is used in which a pallet 3 for transporting a workpiece is reciprocated by a fixed stroke S between a conveyor 1 for transporting pallets and a cleaning stage 2 provided on one side thereof. This is an example in which the present invention is applied to a device.

The pallet 3 on which the workpieces are placed and fixed is conveyed by the conveyor 1 from the processing stage and reaches the elevating conveyor 1A, where only the workpieces on the pallet 3 are transferred to the workpiece conveyor 4 above the cleaning stage 2. and transported to the next stage. Next, the elevating conveyor 1A is lowered to the same level as the cleaning stage 2, and the pallets 3 are moved to the cleaning chamber 2A.
After cleaning in the cleaning chamber 2A, the pallets are transferred to the elevating conveyor 1A again and transported to the pallet conveyor 5.
It is designed to be transported to the next stage.

In order to reciprocate the pallet 3 between the elevating conveyor 1A and the cleaning chamber 2A, a lifter-equipped conveyor is installed on the elevating conveyor 1A, the conveying surface of which rises and falls above and below the conveying surface of the conveyor rollers of the elevating conveyor 1A. A conveyor 7 having a conveyance surface on the same level as the floating conveyance surface of the conveyor 6 with a lifter is provided in the cleaning chamber 2A.

At the rear of the extended side of the conveyor 7, there is provided a pallet transfer device M that reciprocates the pallet 3 in a fixed stroke S while rolling on the conveyors 6 and 7.

The pallet transfer device M includes a pair of left and right horizontal and parallel guide rods 10 that are slidably inserted into a pair of left and right pushers 9a provided on the rear end wall 8 of the cleaning chamber 2A and project into the cleaning chamber 2A. , a movable main body 11 fixed to the tips of both guide rods 10 protruding into the cleaning chamber 2A, and a movable main body 11
A pair of left and right arms 13 are pivotally supported via vertical hinge pins 12 on the left and right sides of the cleaning chamber 2.
For constant stroke driving, the piston rod 14a is disposed parallel to the guide rod 10 at an intermediate position between the axes of both guide rods 10 outside A, and the piston rod 14a penetrates the pusher 15 of the rear end wall 8 and projects into the cleaning chamber 2A. It is composed of a double-acting air cylinder 14 and the like.

The air cylinder 14 is connected to the rear end wall 8 of the cleaning chamber 2A.
It is fixed to a support plate 15 extending rearward from the top.

Each guide rod 10 is slidably inserted through the pusher 9a and a pusher 9b provided on the support plate 15 behind the pusher 9a, and is guided and supported by these pushers 9a, 9b.

As shown in FIGS. 2 and 3, the movable main body 1
1 consists of two upper and lower plate members 11a and 11b superimposed on both the upper and lower surfaces of the guide rod 10, extending between the tips of both guide rods 10.
a and 11b are fixed to the guide rod 10 with screws 16.

Each arm 13 is composed of an outer arm portion 13a extending outward from the hinge pin 12 and an inner arm portion 13b extending inward from the hinge pin 12 and forming an opening angle of approximately 120° with respect to the outer arm portion 13a. 13 is
Each guide rod 10 held between the upper and lower plate members 11a, 11b is inserted into an opening 17 made horizontally, and in the opening 17, the upper and lower plate members 11a, 11b, the guide rod 10, and the arm 13 are inserted.
The outer arm portion 13a has an engagement hook 1 at its outer end.
3c, and upper and lower plate members 11a, 11
An elongated hole 18 extending in the length direction of the inner arm 13b is formed at the inner end of the inner arm 13b protruding into the space between the inner arms 13b and 13b.

The inner ends of the inner arm portions 13b of both arms 13 are loosely fitted into horizontal slits cut into the pivots 19 at the tips of the piston rods 14a of the air cylinder 14, and are inserted into both elongated holes 18. Both inner arm portions 13b are connected to the piston rod 14a by a vertical pin 20 that is inserted through and fixed to the pivot 19.

Furthermore, both upper and lower ends of the pin 20 extend outward through elongated holes 21 in the direction of the piston rod 14a formed in the upper and lower plate members 11a and 11b, respectively, and are prevented from coming off with washers or retaining rings.

The tips of both guide rods 10 are connected to the movable body 1.
Each guide rod 1 protrudes slightly from the front end of 1.
A bolt 22 is screwed onto the tip of the pallet 3, and the head surface of the bolt 22 becomes a contact portion that comes into contact with the rear side surface of the pallet 3.

When the pin 20 is positioned at the front end of the elongated hole 21, the outer arm portions 13a of both arms 13 are in the open position as shown by solid lines in FIG. Pin 2 while touching
0 is located at the rear end of the elongated hole 21, both arms 1
The outer arm portion 13a of the pallet 3 is closed and the engaging hook 13c thereof is in an engaged position in which it engages with the engaging portions 23 provided at the rear ends of the left and right sides of the pallet 3.

Next, the operation of the pallet transfer device M will be explained with reference to FIG.

When the piston rod 14a of the air cylinder 14 is extended while the pallet 3 is at a predetermined position on the elevating conveyor 1A, the sliding resistance between the guide rod 10 and the pushers 9a, 9b also acts, causing the movable body 11 Since the inertia force also acts on the pin 20, the pin 20 moves to the front end of the elongated hole 21, and the movable body 11
0 by the piston rod 14a, both arms 13 move forward while remaining open to the open position.
At approximately the full stroke position of the piston rod 10, the contact portions of the front ends of both arms 13 contact the rear side surface of the pallet 3.

When the piston rod 14a is moved rearward in this state, sliding resistance and inertia force act as described above, so the pin 20
is pulled back to the rear end position of the elongated hole 21 and both arms 1
3 is closed to the engagement position, and the engagement hook 13c engages with the engagement portion 23 of the pallet 3 (position of point A in the figure),
At the same time, the movable body 11 is connected to the piston rod 14 via both arms 13 or via the pin 20.
a, and is transferred to a predetermined position (indicated by a phantom line) in the cleaning chamber 2A.

After cleaning the pallet 3 in the cleaning chamber 2A, when the piston rod 14a is extended, the pin 20 moves to the front end of the elongated hole 21 due to the sliding resistance and the inertial force acting on the movable body 11 and the pallet 3. When the arm 13 is opened to the open position (point B in the figure), the contact parts at the tips of both guide rods 10 are in contact with the rear side of the pallet 3, so that the contact parts, the movable body 11, and the pin 20 are in contact with each other. The pallet 3 is pushed forward by the piston rod 14a.

As described above, the pallet 3 of the lifting conveyor 1A is moved by a fixed stroke into the rear side of the cleaning chamber 2, and after washing, the pallet 3 is moved by a fixed stroke from the cleaning chamber 2A onto the lifting conveyor 1A to proceed to the next stage. It can be transported.

Incidentally, the pallet transfer device M can be partially modified as follows.

First modification: the guide rod 10 and pushers 9a, 9b
is omitted, a idler is provided at the bottom of the movable body 11, and the movable body 1 is rolled on a rail through the idler.
1 to guide and support.

In this case, the contact portion is provided on the movable main body 11.

Second modification: The elongated hole 21 is omitted, and instead a stopper is provided on the movable body 11 to restrict the swinging limit of the arm 13.

According to the pallet transfer device of the above embodiment, the opening and closing of the arm 13 and the fixed stroke reciprocating movement of the pallet 3 can be carried out using a single air cylinder 14, so that the overall structure of the device is simplified and excellent in practicality.

[Brief explanation of the drawing]

Figures 1 to 4 of the drawings show an embodiment of the present invention, with Figure 1 being a partial cross-sectional plan view showing the cleaning stage and the surrounding conveyor, and Figure 2 showing the main parts of the pallet transfer device. Fig. 3 is a partially cutaway cross-sectional plan view of the same main part, Fig. 4 is a diagram illustrating the operation of the pallet transfer device, and Fig. 5 is a plan view of the main part of a conventional pallet transfer device. . M... Pallet transfer device, 3... Pallet,
6, 7... Conveyor, 9a, 9b... Pushpu,
10... Guide rod, 11... Movable body, 13
...Arm, 13a...Outer arm, 13b...Inner arm, 14...Hydraulic cylinder, 14a...Piston rod, 18...Elongated hole, 19...Pivot, 20...
...pin, 23...engaging portion.

Claims (1)

[Claims for Utility Model Registration] In a device that reciprocates a workpiece conveyance pallet movably supported on a conveyor with a fixed stroke, a movable body that moves along the moving direction of the pallet is supported by a support mechanism, A pressing surface for the pallet is provided on the side of the movable body that faces the pallet, and a pair of opening/closing arms are pivotally supported on the movable body, so that the outer arms on the outside of the pivot supports of both arms are closed. It can be freely switched between the engagement position where it engages with the engagement parts on both sides of the pallet and the open position where both outer arms are open, and each elongated hole is formed at the inner end of the inner arm that is inside the shaft support of both arms. A pin inserted through both elongated holes is connected to the tip of a piston rod of a drive cylinder for transfer, and the arm is oscillated to switch positions before the drive cylinder transfers the pallet in a fixed stroke. A pallet transfer device characterized by: