JP3025879B2 - Scrap sheet processing machine in thermoforming equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing machine for finely cutting scrap sheets generated in a thermoforming apparatus.

[0002]

2. Description of the Related Art In a general continuous thermoforming apparatus, a continuous synthetic resin sheet wound in a roll shape is fed into a thermoforming apparatus one shot at a time to perform molding, and the molded sheet is trimmed by a trimming apparatus. Perform trimming. When a scrap sheet after trimming is used as a recycled material from the viewpoint of effective use of resources, the sheet is finely cut by a crusher. Japanese Patent Application Laid-Open No. 48-72752 discloses an example of such a crusher. The cutter used in the crusher has sharp teeth continuously formed on the outer periphery of a disk, cuts the scrap sheet fed by the teeth in the horizontal direction, and forms the teeth of adjacent cutters. It is structured to be cut vertically and narrowly by the bottom part.

[0003]

In the above-mentioned conventional crusher, when cutting a scrap sheet having a thickness of about 0.15 to 0.2 mm such as polypropylene or polyethylene resin which is easily stretched, the tooth of the cutter is used. Since a part of the sheet sandwiched between the bottom portions is stretched by entering into a small gap between the adjacent teeth, there is a possibility that a trouble occurs in which the sheet is elongated in an udon noodle shape and is not cut finely. For this reason, there has been a demand for the development of a processor capable of surely cutting such sheets.

[0004] It is an object of the present invention to provide a processing machine capable of surely and finely cutting even a stretchable and thin scrap sheet such as polypropylene or polyethylene resin.

[0005]

In order to achieve the above object, according to the present invention, a pair of rotary shafts are provided in a box frame in parallel, and a plurality of disk-shaped cutters are provided on each rotary shaft. Are provided with cutter groups arranged concentrically at regular intervals, and the cutters of one cutter group and the cutters of the other cutter group are provided so as to alternately enter, and the scrap sheet to be supplied is controlled by the cutter groups. A scrap sheet processing machine in a thermoforming apparatus configured to cut finely, wherein the cutter is configured so that acute-angled teeth and arc-shaped flat portions are sequentially arranged in a circumferential direction, and the thickness of the teeth is adjusted. A concave groove is provided on the front end surface in the direction, and the teeth of the cutters of one cutter group and the flat portions of the corresponding cutters of the other cutter group, and the flat portions of the cutters of one cutter group and the other cutter group Wherein the teeth of the corresponding cutter is configured to rotate synchronously with the rotary shaft to match respectively.

According to a first aspect of the present invention, in the scrap sheet processing machine of the thermoforming apparatus according to the first aspect, every other tooth of the cutter and a flat portion are sequentially arranged at an equal angle. It is characterized by the following.

[0007]

The cutters constituting both cutter groups are provided with sharp teeth and arc-shaped flat portions in this order, so that the sharp cutting edges are rotated by the rotation of the rotating shaft to make the scrap sheet. The sheet acts to gradually pull the sheet into the processing machine while biting into the surface of the sheet. Then, when the cutter group is further rotated and the root portion of the tooth coincides with the flat portion of the adjacent cutter, the scrap sheet is cut in the longitudinal direction without being stretched. Further, according to the scrap sheet processing machine provided with a cutter group in which every other tooth of the cutter and a flat portion are arranged in order at equal angles, the bite of the cutting edge into the scrap sheet and the cutting action are good, and the cutting is performed. Processing is performed more smoothly and quickly.

The scrap sheet processing machine has the advantage that various synthetic resin scrap sheets, including easily stretchable and thin scrap sheets made of polypropylene or polyethylene resin, can be reliably cut into small pieces. Have.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the processing machine, and FIG.
3 is a sectional view of a cutter group with a part omitted, FIG. 3 is an explanatory view of the cutter, FIG. 4 is a front view showing a main part of the cutter, and FIG. 5 is a sectional view taken along line AA of FIG.

As shown in FIG. 1, a scrap sheet processing machine C includes a pair of rotating shafts 3 and 4 in a box frame 1 having an opening 2 into which a synthetic resin scrap sheet s is inserted.
Are provided in parallel in the up-down direction, and a pair of cutter groups x and y in which a large number of disc-shaped cutters 10 are concentrically arranged at regular intervals on each of the rotating shafts 3 and 4 are provided. 5
Is a table attached to the front plate 1a of the box frame 1 so as to be flush with the lower guide plate 2a of the opening 2.

The cutter 10 has an outer diameter of 145 mm and a thickness of 4 m.
A mounting hole 12 is formed in the center of a disk-shaped main body 11 having a size of about m, and a pair of locking pieces 13 protruding inward of the hole 12 are formed (FIG. 3). In the circumferential direction of the main body 11, the acute teeth 14 and the arc-shaped flat portions 16 are formed so as to be arranged alternately at an equal angle via the tooth bottom portion 15 (FIGS. 3 and 4). ). As shown in FIG. 5, a V- or U-shaped concave groove 14a is provided on the tip end surface in the thickness direction of the tooth 14 except for a little end 14b on both sides.

As shown in FIG. 2, the left and right side plates 1 of the box frame 1
b, a plurality of the cutters 10 are inserted into the rotating shaft 3 supported by bearings 20 alternately via spacers 21, and screwed into a ring 22 fixedly fitted to the rotating shaft 3 from outside. The nuts 23 are tightened and the cutters 10 are pressed and fixed in the axial direction. Note that, in order to prevent the nut 23 from being loosened due to the operation of the processing machine C, a tightening structure in which the cutter 10 is pressurized using a spring member such as a disc spring may be used. Each cutter 10 is provided so as not to move in the rotation direction by fitting a locking piece 13 into a helical key groove 3 a formed in the rotating shaft 3. 24 is the cutter 1
Rotating shaft 3 to restrict 0 from moving in the axial direction
Reference numeral 25 denotes a gear fixed to the shaft end 3b of the rotary shaft 3. Reference numeral 26 denotes a baffle plate for removing the scraps of the scrap sheet s adhered to the cutter 10, and is interposed between the cutters 10 and has a horizontal axis 27.
28 and the rotating shaft 3 are loosely supported. As described above, one cutter group x is configured.

The other cutter group y has the cutter group x
The configuration is the same as described above. That is, on the rotating shaft 4 supported by the bearing 30, a large number of cutters 10 are inserted into every other via the spacer 31 with the locking pieces 13 fitted in the helical key grooves 4 a, and inserted into the rotating shaft 4. The nut 33 screwed from the outside to the ring 32 firmly fitted to the
Is fixed by pressing in the axial direction. Reference numeral 34 denotes a retaining ring similar to that described above, and reference numeral 35 denotes a drive gear fixed to the shaft end 4b of the rotating shaft 4 driven directly or indirectly by a motor device (not shown). 36 is sandwiched between the cutters 10 and the horizontal axis 3
The baffle plate is loosely supported by the rotation shafts 7 and 38.

As shown in FIG. 2, the cutters 10 of one cutter group x and the cutters 10 of the other cutter group y are arranged so as to be staggered, and the gear 25 and the driving gear 35 are engaged with each other. Thus, when the rotating shafts 3 and 4 rotate synchronously, the teeth 14 of one cutter 10 and the flat portion 16 of the other corresponding cutter 10, and the flat portion 16 of one cutter 10 and the other corresponding cutter 10 The teeth 14 are provided so as to match each other.

Next, the operation of the scrap sheet processor C in the thermoforming apparatus having such a configuration will be briefly described. When the scrap sheet s is put into the opening 2 of the processing machine C, each cutter 1 of the pair of cutter groups x and y
The zero sharp teeth 14 act to bite into the surface of the scrap sheet s and gradually pull the sheet s inward. Next, when the cutter groups x and y are further rotated and the roots 15 of the teeth 14 and the flat portions 16 of the adjacent cutters 10 coincide with each other, the scrap sheet s is cut in the vertical direction without being stretched. . As described above, each of the cutters 10 is locked in the helical key groove and is fixed with a slightly shifted phase in the radial direction.
Does not come into contact with the motor at the same time, so that no large load is generated on the motor device.

According to the scrap sheet processing machine,
Various synthetic resin scrap sheets, including easily stretchable and thin scrap sheets made of polypropylene or polyethylene resin, which could not be sufficiently crushed with conventional crushers, can be cut smoothly and reliably. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a processing machine.

FIG. 2 is a sectional view of a cutter group with a part omitted.

FIG. 3 is an explanatory view of a cutter.

FIG. 4 is a front view showing a main part of the cutter.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

[Explanation of symbols]

C → scrap sheet processing machine x → one cutter group y → the other cutter group s → scrap sheet 1 → box frame 3,4 → rotary shaft 10 → cutter 14 → tooth
14a → groove 15 → tooth bottom 16 → flat

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI B29K 105: 26 (56) References JP-A-55-123415 (JP, A) JP-A-7-246618 (JP, A) Kaihei 5-80535 (JP, U) Japanese Utility Model Hei 4-70146 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29B 13/10 B29B 17/00 B02C 18/00- 18/44

Claims (2)

(57) [Claims] 1. A cutter group in which a pair of rotating shafts are provided in parallel in a box frame, and a plurality of disk-shaped cutters are concentrically arranged on each rotating shaft at a constant interval. A scrap sheet processing machine in a thermoforming apparatus configured so that a group of cutters and a cutter of the other group of cutters are provided so as to alternately enter, and the supplied scrap sheet is cut into small pieces by the group of cutters. The cutter is configured by sequentially arranging acute-angled teeth and arc-shaped flat portions in the circumferential direction, providing a concave groove on a tip end surface in the thickness direction of the teeth, and forming the cutter teeth of one cutter group and the other. The rotating shafts are synchronously rotated so that the flat portions of the corresponding cutters in the group of cutters and the flat portions of the cutters in one group of cutters coincide with the teeth of the corresponding cutters in the other group of cutters. A scrap sheet processing machine in a thermoforming apparatus, characterized in that the scrap sheet processing apparatus is configured to rotate. 2. A scrap sheet processing machine according to claim 1, wherein every other tooth of the cutter and a flat portion are arranged at equal angles in order.