JPS6221701B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet transport device, and particularly to a sheet transport device using synthetic resin, foamed polystyrene, or the like as a material.

For example, in a vacuum forming machine used for forming food packaging packs, etc., sheets are conventionally transferred by a sheet transfer device as shown in FIGS. 1 to 3. That is, in the same figure, 1, 2
are a pair of endless chains having parallel straight running parts 1' and 2', which are installed at symmetrical positions. The chains 1 and 2 have chain pieces 5 and 6 chained to both ends of a roller 4 loosely fitted to a shaft 3, with the lower end of the chain piece 5 and the upper end of the chain piece 6 facing outward. Bend it into an L shape and remove the protruding piece 5.
a, 5b and 6a, 6b are formed. A needle material 8 is protruded from the lower surface of the protruding piece 5a on the inner end side of the chain 1 via a mounting member 7, and a protruding piece 6 of the chain 2 facing the protruding piece 5a
A needle receiving pad 9 made of elastic material such as rubber is fixedly attached to the upper surface of a. Further, a spring 10 is attached to one of the protruding pieces and compressed between the other protruding pieces 5b and 6b of each chain 1, 2. 11 and 12 are chains 1 and 2
A pair of guide rails are provided above and below the linear running portions 1' and 2', and the chains run with the rollers 4 of the chains 1 and 2 in contact with these guide rails. 13 is a chain wheel, and 14 is a sheet made of synthetic resin or the like. Then,
Due to the spring force of the compression spring 10, the protruding piece 5
By applying a biasing force between a and 6a, the needle material 8 is inserted into the receiving pad 9, and the attachment member 7 is crimped onto the pad 9. As a result, the sheet 1
The sheet 14 is conveyed by holding both side edges of the sheet 14 as shown in FIG.

However, according to the above conventional sheet transport device, the spring force of the compression spring 10 causes the roller 4 to come into pressure contact with each guide rail 11, 12, and the repulsive force causes the edge end of the sheet 14 to be moved between the needle material 8, the mounting member 7, and the roller 4. Since the rollers 4 are sandwiched between the pads 9, a frictional force is generated between the rollers 4 and the guide rails 11 and 12. In particular, when the thickness of the sheet 14 becomes thicker, the spring 10 is further compressed and the spring force becomes stronger.
An extremely large frictional force is generated between the guide rails 11 and 12, and the tensile force on the seat 14 becomes large.
In addition to requiring a large motor with a large driving force, parts such as the roller 4 and guide rails 11 and 12 are subject to extremely high wear, resulting in poor durability and high cost. Furthermore, due to the constraints of the guide rails 11 and 12, the sheet 14 with a wall thickness above a certain level cannot be held between the mounting member 7 and the pad 9. In this case, another molding machine capable of holding and transporting even thick sheets is required, which is extremely uneconomical.

In addition, in the molding machine, a heating device for heating the sheet 14 is placed in the pre-process of the mold while the sheet is being transferred, but this heating device does not heat the chains 1 and 2 on the way back. Undesirable. That is, when the edges of the sheet 14 are held between the heated members of the chains 1 and 2, the edges of the sheet may be torn due to the heat, which may impede the molding of the sheet. Therefore, in order to avoid the chains 1 and 2 on their way back from being heated by the heating device, the chains 1 and 2 are circulated upward and downward in a large detour in a rectangular shape as shown in FIG.
Although only chain 1 is shown in the drawing,
The same applies to chain 2. However, if the chains 1 and 2 are made to make such a large detour, oil or dust, etc., attached to the chain 1 may fall onto the seat 14. Since the finished product molded by the molding machine is normally used as a food packaging pack without being washed, it is extremely inconvenient for oil etc. to fall onto the sheet 14 as described above. Moreover, if the chains 1 and 2 are made to take a large detour, the chains will become long and many parts will be required, resulting in extremely high costs.

Figure 4 shows another conventional example, which is
Fixed guide rail 16 with long grooves 15 formed on the bottom surface
and an endless chain 18 having a large number of needles 17 protruding from the upper surface thereof are respectively provided at symmetrical positions on both sides.
It is configured so that it runs. Then, the edge of the sheet 14 is inserted by the needle 17, and the edge is positioned between the lower end surface of the guide rail 16 and the upper surface of the chain 18, and the sheet 14 is transported. However, according to this, the edge end of the sheet 14 is not crimped and is simply held by the needle material 17, so the edge end is torn and the needle material 17 slips out.
This often causes problems in forming the sheet 14. In addition, if the sheet 14 is thick, a large needle material 17
However, when such a large needle material 17 is used, there is a drawback that the ear end becomes wide and loss occurs.

The present invention is an improvement made in view of the above-mentioned drawbacks, and the structure thereof will be described below with reference to embodiments shown in the drawings.

5 to 10, reference numerals 21 and 21 are a pair of endless chains having linear running parts 21' and 21' and circulating in the horizontal direction. It is arranged in parallel around the chain wheels 23, 23 supported in position, and is configured to move intermittently in circulation at every predetermined pitch. Each of the above chains 21, 21
chain pieces 25 and 26 are chained to the upper and lower ends of a roller 24 that is vertically supported in a rotatable manner, and a guide member 27 is provided along the chain running section between the chain wheels 23 and 23 at both ends.
The chains 21, 2 run in the guide groove 28 of the
1 is prevented from sagging. Numeral 29 is a large number of clips fixed in parallel on the upper end surface of each of the chains 21, 21, and 30 is a sheet made of synthetic resin or styrofoam. Transfer intermittently. The clip 29 is attached to the upper movable clamping piece 2.
9a and the lower fixed clamping piece 29b are rotatably supported by a pin 31, and a spring 32 is loosely fitted to the pin 31 to apply a spring force to the tip abutment part 33. The rear end portion of the fixed clamping piece 29b is attached and fixed to the upper end surface of each chain 21, 21 via, for example, a bracket 34 and a mounting member 35, and the fixed clamping piece 29b is horizontally projected and supported outward. A needle material 37 is fixedly protruded downward by nuts 36, 36 to the projecting piece 33a of the movable holding piece 29a constituting the abutting portion 33 of the clip 29, and the fixed holding piece 29b facing the projecting piece 33a is fixed. A needle receiving pad 38 made of elastic material such as rubber is attached and fixed to the upper surface of the protruding piece 33b.

39 is a turn portion 40 of each chain 21, 21
This is a clip opening/closing means provided at 40a and 40a. In this clip opening/closing means, reference numeral 41 is a U-shaped arm fixed at a predetermined position near the turn portions 40a and 40b, and 42 is a shaft 43 that is swingably supported at the tip of the arm 41 and is suspended. This is an inclined disk rotatably supported at a position above each chain wheel 23 in a posture inclined in the circumferential direction at a predetermined angle. It is constructed so that its inclination angle can be adjusted. The clip 29 is opened and closed by pressing and releasing the rear end portion of the movable holding piece 29a of the clip 29 at the outer peripheral edge of the lower surface of the inclined disc 42.

As shown in FIG. 10, the inclined disc 42 is inclined so that the side that overlaps with the running trajectory of the ear portion of the seat 30 is located below the running trajectory of the upper rear end of the movable holding piece 29a of the clip 29. , in FIG. 10, the abutting portions 33 are opened at positions c to f, and during this time the ears of the sheet 30 are introduced between the open abutting portions, and the abutting portions 33 are closed at position g. , for holding the sheet ears.

Therefore, when the sheet 30 is to be transferred in the direction of the arrow as shown in FIG. Rotate each chain 21, 2 synchronously in the direction of the arrow.
1 is moved intermittently in circulation. Then, the clip 29 fixed to each chain 21, 21 is moved to the turn portion 40a as the chains 21, 21 move intermittently, and
1', the inclined disc 42 is tilted in a predetermined posture as described above, so that the rear end portion of the movable holding piece 29a of the clip 29 touches the outer peripheral edge of the lower surface of the inclined disc 42. It starts to come into contact with the part.
As the clip 29 moves through each position b, c, d, e, and f, the rear end portion of the movable clamping piece 29a is pressed deeper into the inclined disc 42 against the spring force of the spring 32. As a result, the movable holding piece 29a rotates about the pin 31, and the end abutting portion 33 of the clip 29 gradually opens, and the amount of expansion becomes maximum at position f. At this time, since the inclined disk 42 is rotatably supported, as the clip 29 moves, the inclined disk 42 also moves together with the clip 29 while remaining in contact with the movable holding piece 29a of the clip. Rotate to . Therefore, the friction between the clip 29 and the inclined disk 42 can be minimized. Then, at the same time as the clip 29 passes through the maximum expansion amount position f, it reaches the clip closing position g, and as a result, the rear end portion of the movable clamping piece 29a comes off from the inclined disc 42, and its pressure is released. As a result, the clip 29 is instantaneously and suddenly closed by the spring force of the spring 32, and the needle 37 attached to the protrusion 33a is inserted into the receiving pad 38. The clip 29 thus closed reaches the turn portion 40b after moving through the straight running portions 21', 21'. Then, just before the clip 29 reaches the turn part 40b from the straight running part 21' or at the same time as the clip 29 reaches the turn part 40b, the rear end portion of the movable clamping piece 29a moves toward the inclined disc 40b.
This causes the clip 29 to gradually open. Furthermore, the clip 29 is connected to the turn portion 40.
The clip 29 gradually closes as the clip 29 moves along the slanted disk 42, and when it reaches a predetermined position in the circumferential direction, the clip 29 is completely closed. The clip 29 thus closed reaches the turn portion 40a again as each chain 21, 21 moves intermittently and repeats the same operation.

Then, the clip 29 is attached to the turn portion 40a.
On the side, since the sheet 30 starts to expand at the outer end position a from the transport path, the edge of the fed sheet 30 passes between the protrusions 33a and 33b of the clip 29, and the sheet 30 is not transported. When the clip 29 reaches the closing position g, the clip 29 closes instantaneously and sharply as described above, and the needle material 37 passes through the edge of the sheet 30 and connects to the pad 38.
and insert the sheet edge into the nut 36 and pad 38.
Crimp and clamp. In particular, since the movable holding pieces 29a and 29b of the clip 29 rotate about the pin 31 to open and close, the amount of expansion of the clip 29 is extremely large, and moreover, at the closed position g, the clip 29 opens and closes instantaneously and rapidly. , so sheet 3
Even if the wall thickness of the needle 0 is thick, the needle material 37 can easily penetrate the edge of the needle 37 and crimp it. Therefore, the clip 29 will not come off from the edge of the sheet 30 even during molding, for example, with a metal mold. When the predetermined shaping is completed, the sheet 30 is sent to the turn portion 40b side, and by the action of the inclined disk 42, the crimp clamping by the needle material 29 at the edge of the sheet is released, and the sheet 30 is sequentially sent to the process.

The present invention includes a pair of endless chains having a straight running part and arranged to run along a horizontal plane, with the straight running part spaced apart by a seat width, and a fixed chain fixed to the chain. A movable clamping piece is provided on the clamping piece, the tip of the movable clamping piece is pressed against the tip of the fixed clamping piece by an elastic member, a needle material is provided protruding from the tip of the movable clamping piece, and the above-mentioned needle material is attached to the tip of the fixed clamping piece. A receiving pad is fixedly attached to form an abutting part at the tip of both clamping pieces, and a large number of clips are provided at equal intervals around the entire circumference of the endless chain with the abutting part facing outward. An inclined disc is rotatably provided above the wheel and is inclined so that the side that overlaps with the travel trajectory of the seat ear portion is located below the travel trajectory of the upper rear end of the movable clamping piece of the clip. At the inclined part of the inclined disk, the abutting part of the clip passing through the part is opened and then closed, so any sheet can be used regardless of the thickness of the sheet. The edge ends can be crimped and clamped, and the crimping and clamping force can always be kept substantially constant. Also, the sheet is
Instead of being held by a total of 4 chains installed vertically and oppositely as in the past, it is configured to be held by clips fixed to a total of 2 left and right chains, so the frictional force generated when the chains are driven is extremely small.
Therefore, it is possible to use a small motor with a small driving force, and the wear of parts is small, durability can be improved, and costs can be reduced. Furthermore, since the chain moves horizontally, the chain on its way back will not be heated by a heating device or the like. Therefore, the circulating distance of the chain can be minimized, the length of the chain can be significantly shortened compared to conventional equipment, the number of parts can be reduced, and the manufacturing cost can be extremely reduced. Oil or dust attached to the chain does not fall onto the seat, and the conventional inconveniences can be solved, and the practical effects are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a side view of a conventional transfer device, Fig. 2 is a front sectional view thereof, Fig. 3 is a schematic perspective view showing how to install the chain, and Fig. 4 is a cross section showing another conventional example. It is an explanatory diagram. 5 to 10 show the device of the present invention, FIG. 5 is a schematic plan view thereof, FIG. 6 is a partially enlarged plan view of FIG. 5, and FIG. 7 is a front view with a partially omitted cross section. , FIG. 8 is a side explanatory view of the clip opening/closing means at the turn part of the chain,
FIG. 9 is a cross-sectional front view of the main part showing the state in which the clip is attached to the chain, and FIG. 10 is an explanatory diagram showing the procedure for opening and closing the clip at one turn of the chain. 21, 21... Endless chain, 21', 2
1'... Straight running part, 29... Clip, 30...
... Sheet, 32 ... Spring, 33 ... Tip abutting section, 37 ... Needle material, 38 ... Pad, 39 ...
Clip opening/closing means, 40a, 40b...Turn portion.

Claims (1)

[Claims] 1. A pair of endless chains having a straight running part and arranged to run along a horizontal plane, with the straight running part spaced apart by the seat width, and a fixed clamp piece fixed to the chain. A movable clamping piece is provided, the tip of the movable clamping piece is pressed against the tip of the fixed clamping piece by an elastic member, a needle material is protruded from the tip of the movable clamping piece, and a pad for receiving the needle material is provided at the tip of the fixed clamping piece. is fixed to form an abutting part at the tip of both clamping pieces, and with the abutting part facing outward, a large number of clips are provided at equal intervals around the entire circumference of the endless chain, and a large number of clips are attached to the upper part of the chain wheel. Rotatably installed in position,
The clip is provided with an inclined disc arranged so as to be inclined so that the side that overlaps with the traveling trajectory of the seat ear portion is located below the traveling trajectory of the upper rear end of the movable holding piece of the clip, and the inclined portion of the inclined disc is . A sheet transport device characterized in that the abutting portion of the clip passing through the region is opened and then closed.