JPS63295144A - Work pallet for tact system assembly-line operation - Google Patents

Abstract

PURPOSE:To aim at the positive step of an intermittent driving conveyor belt at the specified position by conveying the belt in a way of holding it between a roller of a clamp device and that of an unclamp device, pressing the roller of the clamp device with a pressure at a working position, and releasing the pinch of the belt while positioning it. CONSTITUTION:An attachment 36 of an intermittent driving conveyor belt 17 is held between a roller 10 of a clamp receiving device 5 and a roller 12 of an unclamp device 7 in the clamp chamber 2 installed in the outside 1 of a work pallet P and thus conveyed. The receiving device 5 is a plate spring 6, pressed toward the unclamp device 7 all the time and given pinching force. In a working position, there is provided with a presser adjoining to the outside 1 of the work pallet P, and its pin is projected out whereby an unclamper 4 of the unclamp device 7 is pressed, therefore the clamp device 5 is pressed against a spring 6, thus the pinch is released. Simultaneously with this, the conical body formed in the pin of the presser is engaged with an input hole 18 of the unclamp device and positioned. Consequently, the pallet P is positively stoppable at the specified working position.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a work pallet used in a tact system-type assembly line operation in which the movement of the conveyance device is stopped during the operation, and the receiver is activated after the holding operation is completed. To provide an unclamp holding operation after a predetermined assembly work is completed and an unclamp release operation at the start of an assembly work to be omitted to improve production efficiency and to eliminate an accompanying unclamp holding operation device.

<Background of the Invention> In a general tact system-type assembly line conveyance device, a plate-shaped work pallet P is simply placed on a conveyance belt 17 made of a synthetic resin belt such as rubber and conveyed by friction. During the rainy season, the belt absorbs moisture and stretches, causing it to shift backward from each station S (that is, to the front without reaching each station S).

Conventionally, in order to prevent this backward shift and precisely align the center of the work pallet P with the center of each station S, the conveyor belt 17 is fed in a tact larger than the distance between the stations S, and the workpiece is In addition to preventing the pallet P from staying in front of each station S, the work pallet P that is about to be sent beyond the stage tongue S is stopped by a pallet stopping means attached to the center of two rubber belts. It is configured as follows.

However, the above conventional technology has the following problems.

(1) Because of the extra takt feeding, the takt time required for assembly line work itself is increased, resulting in a decrease in productivity.

(2) When the pallet stopping means stops receiving the work pallet P, since the speed of the pallet P is not 0,
The workpiece pallet P receives a stop impact, causing the workpiece to shift relative to the pallet P.

(3) If the conveyance speed or the weight of the work pallet P is high, there is a high possibility that the work pallet P will slide backward on the conveyance belt 17 due to static inertia and will not be able to accurately stop at a predetermined station S.

<Prior art> Therefore, the present applicant first proposed the invention related to Japanese Patent Application No. 1983-223336 (filed on September 19, 1988), and -
The above problems have been resolved.

That is, as shown in FIGS. 7 and 8, the prior art is a side part of a work pallet P for takt system assembly line work! A clamp chamber 2 is formed inside the clamp chamber 2, and a transfer clamp 3, an unclamp device 4, and an unclamp holding device too are provided in the clamp chamber 2. By applying pressure, the intermittent drive conveyance belt I7 of the assembly tact conveyance device 16 can be clamped and fixed between the clamp tool 5 and the receiver 7, and the unclamp device 4 can hold the clamp tool 5 against the suppression means 6. The unclamp holding device too is configured to be pressed toward the unclamp F side, and its unclamp operation input section ■8 faces the outer space of one side 1 of the work pallet P. The clamping tool 5 is configured to be pressed by the unclamp holding side K and engaged and fixed when it passes from the clamp position to the unclamp position and reaches the unclamp holding position, and is held at the unclamp holding position, and is held in the unclamp holding position. The unclamp holding/release operating section 102 of the device is configured so as to face the outer space of one side l of the work pallet P.

Therefore, since the work pallet P is integrally connected to the conveyance belt 17 using the tact system type flow (1) conveyance clamp 3, the conveyance belt 17 can The pallet P can be reliably moved along with the pallet P to prevent it from slipping upward.

Therefore, the work pallet P can be accurately positioned at the center of the station S, and the tact feeding length can be made equal to the distance between each station S, so that the tact feeding time can be shortened.

(2) When the work pallet P reaches each station S, the speed of the pallet P is 0, so that the stop shock caused by the pallet stop means can be eliminated.

<Problems to be Solved by the Invention> However, the above prior art has room for improvement in the following points.

(1) When the work pallet P that has completed the predetermined work comes to the terminal stage Jin Sn of the conveyance line, the clamp tool 5 is operated to the unclamp holding position by the external unclamp holding operation device 104, and the unclamp holding device 10
If the workpiece pallet P is not fixed in a free state from the conveyance belt 17 by holding the clamping tool 5 in this position at It cannot be returned to station S0.

Therefore, productivity decreases by the amount of unclamp holding operation required.

(2) Work pallet P is L starting end station controller S.

If the unclamp holding device 100 has been circulated to
7 cannot be clamped again.

Therefore, the productivity decreases by the amount of unclamp holding release operation required.

(3) The unclamp holding device 100 must be attached to the clamp chamber 2 of the work pallet P, making the structure of the pallet P complicated.

The present invention is an improvement on the above-mentioned prior art, and its technical problem is to improve production efficiency and simplify the structure of the work pallet P.

<Means for Solving the Problems> Means for achieving the above-mentioned problems will be described below using drawings corresponding to embodiments.

That is, in the present invention, a clamp chamber 2 is formed in one side l of a work pallet P for tact system assembly line work, and a transportation clamp 3 and an unclamp device 4 are installed in the clamp chamber 2.
The transporting clamp 3 holds the clamping tool 5 with a pressing means 6 to hold the receiving tool 7.
The clamping rollers 10 and 12 are rotatably supported by the clamping parts 8 and 8 of the clamping tool 5 and the receiving tool 7, respectively, and each clamping roller 10,
By orienting the rotation axes 14 and +5 of +2 substantially parallel to the conveyance movement direction A of the intermittent drive conveyance belt 17 of the assembly tact conveyance device 16, the intermittent drive conveyance belt I7 of the assembly tact conveyance bag ft16 is moved by the clamping tool 5 Clamping roller IO and clamping roller of receiver 7! 2, and the unclamping device 4 is configured to press the clamping tool 5 toward the unclamping F side against the pressing means 6, and the unclamping operation input section 18 is configured to be able to be clamped and fixed between the It is characterized by being constructed so as to face the outer space of one side I of the work pallet P.

(1) The work pallet P is transferred to the assembly tact conveyance device 16.
When the work pallet P reaches the start station S0 of the transport device 16, the work pallet P is moved by the transfer device
7 and clamps against the conveyor belt I7.

In this case, the transportation clamp 3 of the work pallet P continues to be in a clamped state, but when the work pallet P is pushed down by a dedicated push-down device after being transferred by the transfer device, the elastic force of the pushing means 6 This pushing down force is overcome and the conveyor belt 17 is pushed between the clamp rollers 10 and 12 that are in elastic contact, and the work pallet P is automatically moved onto the conveyor belt 17 without any unclamp release operation. be clamped.

Then, the work pallet P integrally clamped to the conveyance belt 17 is sequentially conveyed to each stage gin S11.

(2) Next, when the work pallet P comes to each mechanical work station S, an external unclamping operation device is transferred from the unclamping operation manual unit 18 to the unclamping device 4.
, the clamping tool 5 is pressed against the elastic force of the pressing means 6.
The clamping roller 10 of the receiver 7 is connected to the clamping roller 1 of the receiver 7.
2, and the work pallet P is released from the unclamped state with respect to the conveyance belt 17.

At the same time, the work pallet P is positioned at the center of the station S, and for example, in speaker assembly work, the workpieces on the pallet are glued, assembled, crimped, etc.
Perform mechanical work such as caulking.

(3) When the work pallet P that has completed the predetermined work arrives at the terminal stage Sn of the conveyance line, the workpieces on the pallet P are moved to the downstream assembly block by the workpiece transfer device, and the pallet P is transferred It is lifted up by the device, placed on the circulation conveyance device, and returned to the start end stage S0 of the assembly conveyance device 16 again.

In this case, the transporting clamp 3 of the work pallet P still continues to be in a clamped state, but when the work pallet I-P is pulled up by the transfer device, the clamping roller 10. Transport belt 1 from between 12
7 is pulled out, the work pallet P is automatically removed from the conveyor belt 17 without any unclamping operation.

(4) After that, the work pallet P passes through the circulation conveyance device to the tact conveyance device for assembly! If you return to the starting station S0 in step 6, you will return to the operation in (1) above, and perform the steps (1) to (4) above.
) will be repeated.

<Effects of the Invention> (1) The work pallet can be moved relative to the conveyance belt by omitting the work pallet unclamp holding operation at the terminal stage tongue and the work pallet unclamp release operation at the start stage tongue of the assembly conveyance device. Automatically pull up and press drafts! (In addition, in the present invention, instead of the conventional unclamp release operation, it is necessary to push down the work pallet against the conveyor belt, but this push-down operation can be performed more quickly than the unclamp release operation. )
, can improve the efficiency of assembly line work.

(2) Compared to the prior art, the unclamp holding device can be omitted from the work pallet, so the structure of the pallet can be simplified.

(3) When maintaining the work pallet, remove the work pallet from the conveyor belt without unclamping,
Alternatively, since it can be pushed back to the conveyance belt, the maintenance can be performed easily and quickly.

<Example> Hereinafter, an example of a work pallet of the present invention and a tact system-type circulation conveyance facility for assembly line work using the work pallet will be described based on the drawings.

Fig. 1 is a plan view of the work pallet, Fig. 2 is a partially cutaway front view of the work pallet, Fig. 3 is an exploded perspective view of the main parts of the work pallet, and Fig. 4 is a circulating conveyance of the work pallet for speaker manufacturing. It is a schematic plan view of the equipment, and the work pallet circulation transport equipment for speaker manufacturing includes an assembly tact transport device W16, an unloading transport device 20. It is composed of a return transport device 21 and a loading transport device 22.

The assembly tact conveyance device I6 has a chain 1 made of metal material.
7 is interlocked with the drive source 24 via the intermittent drive device j23,
The work pallet P placed on the chain 17 is intermittently conveyed between each station S and then stopped.

At this time, while the workpiece pallet P is tact-fed through the transport device I6, the workpieces W on the pallet P are assembled, and then moved to the assembly block on the downstream side.
.

At the same time, the empty pallet P is transferred to the device 2-3.
→4 and then circulated again to the conveying device I6 (see FIG. 4).

The work pallet P is constructed by removably fixing a substantially cylindrical upper pallet 25 to a substantially prismatic lower pallet 26 with screws, and has two positioning holes 27 in the bottom surface of the upper pallet 25.
is left open, and one side l of the lower pallet 26 is cut out in the shape of a rectangular parallelepiped to form a clamp chamber 2, and the clamp chamber 2 is provided with a transport clamp 3 and an unclamp device 4.

In addition, in the flesh wall near one side l of the lower pallet 26,
A vertically elongated chain guide groove 40 is formed along the transport direction A (see FIG. 3).

The conveying clamp 3 includes a clamping tool 5 pivotably supported on a support plate 28, a receiver 7 formed between the bases 30 on both sides, and pressing the clamping tool 5 toward the clamp side C. It is composed of a leaf spring 6.

The support plate 28 is arranged horizontally, and support arms 31 connected to both sides of the clamp tool 5 are pivoted to the support plate 28 via fulcrums 33 provided on the upper part 32 of the support arms 31 .

Further, the leaf spring 6 is bent into a substantially dogleg shape and the support plate 28
is fixed to the back surface of the clamping tool 5, and its tip 6a is brought into elastic contact with the clamping tool 5, and the clamping tool 5 is moved toward the receiving tool 7 (i.e., in the direction of arrow C).
to press.

Of the clamp tool 5, a U-shaped support groove 5a is formed across the support arms 3I on both sides of the clamp part 8 facing the receiving part 7, and the clamp roller 10 is formed along the support 71t5a.
are fitted in a rotatable state, and the arc portion of the roller 10 is caused to protrude from the smooth surface of the clamp portion 8.

On the other hand, a U-shaped support groove 7a is also formed in the clamp portion 8 of the receiver 7 facing the clamp tool 5,
The clamp roller 12 is rotatably fitted along the support groove 7a, and the arc portion of the roller 12 protrudes from the smooth surface of the clamp portion 8.
0 so that it can be contacted.

In this case, the rotation axes 14, 15 of the clamping rollers to, t2 are manually oriented in the conveyance movement direction A of the conveyance chain 17 (in addition, in the unclamped state, both rollers to , 12 are spaced apart, the separation distance is set so as to maintain a narrow enough distance that these rollers cannot be pulled out from the support groove 51.7a).

In addition, an input hole 18 for unclamping operation is provided in the center of the receiver 7.
, and the unclamp pin 4 is inserted into the manual hole 18 so as to be slidable forward and backward, so that it can come into contact with the clamp part 8 of the clamp tool 5.

The support plate 28 is arranged so as to be fitable between the inner sides of the bases 30 located on both sides of the receiver 7, and the clamp rollers 10.12 are brought into elastic contact with each other at the clamp portions 8.8.

Further, both sides of the base 30 are set to match the width of the clamp chamber 2, and the support plate 30. After the clamp tool 5 and the receiver 7 are assembled into the base 30, they are all housed in the clamp chamber 2.

At this time, a chain guide groove 35 is formed below the base 30, and a chain guide groove 40 formed in the lower pallet 26
These chain guide grooves 35.
40 is positioned along the clamping portion 8 that the clamping roller 10.12 faces.

As shown in FIGS. 1, 2, 5 and 6, one of the two metal chains 17 running along the chain guide groove 35, 40 is a normal chain 17a,
Chain 17b with attachment 36 on the other side
If the attachment 36 is clamped by the conveyor clamp 3, the work pallet P will be attached to the conveyor chain 1.
When the conveyance clamp 3 is unclamped by the unclamp pin 4 and the attachment 36 is separated, the work pallet P is released from the conveyance chain 17 in a free state.

The functions of this work pallet P when applied to a circulation conveyance facility for speaker manufacturing will be described below.

(1) The work pallet P is transported to the transport start station S by the transfer device. When the work pallet P is carried to the conveyance chain 17, a dedicated push-down device lowers the work pallet P toward the conveyance chain 17, and the attachment 36 protruding from the chain 17b is pushed against the pressing force of the leaf spring 6 to the clamping roller 1.
0.12 to clamp the work pallet P to the chain 17.

And the work pallet P integrated with the chain 17
is intermittently conveyed with a work W on it, and is stopped every time it is tact-fed to each station Sm (consisting of a work station where mechanical work or manual work is performed and a free station where no work is performed).

(2) Work pallet P is at mechanical work station 5I1
1, the tact feed is stopped, and at the same time, the unclamp operating device 50 is activated, and the operating pin 51 protruding forward enters the unclamping operation input hole 18 made in the work pallet P. Push the unclamp pin 4 in the unclamp direction F.

As a result, the unclamping pin 4 swings the clamping tool 5 in the direction of arrow F against the pressing force of the leaf spring 6, separating the clamping roller 10 from the clamping roller 12 of the receiver 7, and moving the work pallet P is released from the transport chain 17 to a free state.

In this case, the tip of the operating pin 51 is machined into a triangular shape so that it can engage with the input hole 18 for unclamping operation of the work pallet P, which is machined into a conical shape, and the input hole 18 is engaged with the positioning hole. It is also used as a matching hole.

Therefore, when the unclamping operation device 50 is operated on the unclamping operation input hole 18, the workpiece pallet P can be unclamped, and at the same time, the workpiece pallet P can be accurately transferred to the stage gin Sm of the assembly tact transfer device 16. It can be positioned and enables proper mechanical work such as gluing, crimping, caulking, and assembling.

(3) For example, if it is a circulation facility for field assembly work,
When the predetermined field assembly is completed and the work pallet P arrives at the transport terminal station Sn, the transfer device lifts the work pallet P.

At this time, the attachment 36 of the conveying chain 17b
Since the elastic clamping force of the clamping rollers 10 and 12 is overcome by the pulling force, the conveying clamp 3 releases the attachment 36, and the work pallet P is separated from the conveying chain 17 and transferred for unloading. Attire! ! It will be transferred to the 20th.

(4) After this, the work pallet P is transferred to the unloading conveyance device 20.
→ Return transport device 21 - Loading transport device 22 and then assembly tact transport device! Return to the starting station S0 of 6,
By returning to the operation in (1) above, the following (1) to (
The operation 4) will be repeated.

As described above, the present invention is a work pallet used in tact system assembly line work, and is not limited to manufacturing speakers as in the above embodiment, but is also applicable to home appliances such as watches, telephones, kettles, etc., or automobiles. It can be applied to any product that can be manufactured using a tact system, such as parts.

[Brief explanation of the drawing]

Figures 1 to 6 show embodiments of the present invention; Figure 1 is a plan view of a work pallet, Figure 2 is a partially cutaway front view of the work pallet, and Figure 3 is an exploded perspective view of the main parts of the work pallet. FIG. 4 is a schematic plan view of a work pallet circulation conveyance facility for speaker manufacturing, FIG. 5 is a plan view of main parts of a conveyance chain with an attachment, and FIG. FIG. 7 is a cross-sectional plan view of the main part of a work pallet showing the prior art, and FIG. 8 is a vertical cross-sectional front view of the main part of the work pallet.

Claims (1)

[Claims] 1. A clamp chamber 2 is formed in one side 1 of a work pallet P for tact system type assembly work, and a transfer clamp 3 and an unclamp device 4 are provided in the clamp chamber 2, and the transfer clamp 3 is a clamping tool. 5 is pressed against the receiver 7 side by a pressing means 6, and clamp rollers 10 and 12 are rotatably supported by the clamp parts 8 and 8 of the clamp tool 5 and the receiver 7, respectively, and each clamp roller 10, 12
A tact transfer device 16 for assembling the rotation axes 14 and 15 of
By orienting the intermittent drive conveyance belt 17 substantially parallel to the conveyance movement direction A, the intermittent drive conveyance belt 17 of the assembly tact conveyance device 16 is connected to the clamping roller 10 of the clamp tool 5 and the clamping roller 12 of the receiver 7. The unclamp device 4 is configured to press the clamp tool 5 toward the unclamp F side against the pressing means 6, and the unclamp operation input section 18 is connected to the work pallet. A tact system type workpiece pallet for assembly line work, characterized in that it is configured so as to face the outer space of one side 1 of P.