JP2009018378A - Formed sheet punch die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet punch die capable of securely holding a punch unit on a holding substrate and movably holding the punch unit according to a tray position of a formed sheet. <P>SOLUTION: A bolt 14a is inserted through a tubular member 8a, washer 18a and a mounting hole 15a to be mounted with a nut 19a. An inner diameter of the tubular member 8a is set to be larger than an outer diameter of the bolt 14a, an outer diameter of the tubular member 8a is set to be smaller than an inner diameter of the mounting hole 15a, and length of the tubular member 8a is set to be longer than depth of the mounting hole 15a. This enables the punch unit 20 to move in a horizontal surface even the nut 19a is fastened and the tubular member 8a is pressed/fixed to the holding substrate 13. At the time of punching a tray, when the formed sheet is pressed on the formed sheet punch die, positioning members 26a-26d follow a side surface of the tray, which is accompanied by displacement of the punching unit 20 to allow a punching blade 12 to cut the tray at a correct position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a molded sheet punching die, and more particularly, to a molded sheet punching die used for punching individual trays from a single large molded sheet obtained by molding food trays or the like in series.

  2. Description of the Related Art Conventionally, in supermarkets and the like, trays made of resin sheets such as styrofoam have been used to divide foods such as meat, fish, fruits and the like into small portions each having a predetermined weight. For these trays, those produced by vacuum forming, vacuum / pressure forming or the like are used. Such a tray is usually formed as one large molded sheet 10 as shown in the perspective view of FIG. The molded sheet 10 is punched into individual trays 11, 11.

  The above-described punching of the tray is performed by using a molded sheet punching die in which punching blades matched to the shape of the tray are arranged vertically and horizontally on the substrate. However, the dimensions of the sheet 10 in FIG. 4 are not always constant due to variations in the thermal shrinkage rate of the raw material resin, variations in manufacturing conditions, and the like, and there may be a dimensional error for each manufacturing lot. When such a dimensional error occurs, the tray is not punched at a predetermined position.

  A molded sheet punching die shown in FIG. 9 is used as a means for eliminating punching misalignment due to sheet dimensional errors (Patent Document 1). As shown in the figure, the molded sheet punching die has a large number of punching units 20 mounted on a mounting plate 9 so that the positions thereof can be individually adjusted. In this attachment, mounting holes 15A and 15B having a diameter larger than the diameter of the bolts 14a and 14b are provided on the bottom surface of the punching unit 20, and these mounting holes 15A and 15B are passed through the bolts 14a and 14b. After the position adjustment, the nuts 19a and 19b are tightened and fixed.

  However, when this molded sheet punching die is used, every time the dimensions of the sheet 10 change, the bolts 14a and 14b must be loosened and the positions of all the punching units 20 must be adjusted. It becomes.

As a sheet punching die that eliminates this point, a punching unit is known in which a punching unit is held in a state in which the punching unit can be moved planarly by an upper plate having holes corresponding to individual punching units (Patent Document 2). ). However, in this sheet punching die, in the case of a sheet punching die constituted by a large number of punching units, it is difficult to hold all the punching units with the upper plate, and in particular, the punching blades face downward. When used for the above, there is a problem that the punching unit cannot be held due to the bending of the upper plate.
Japanese Patent Laid-Open No. 9-47999 (Claims 1 and 2, FIG. 2) Japanese Utility Model Publication No. 4-29399 (the scope of claims for utility model registration, Fig. 1)

  The present invention has been made to solve such problems of the prior art, and an object of the present invention is to reliably hold a punching unit on a holding substrate, and to form a tray of molded sheets. It is to provide a sheet punching die holding a punching unit movably according to the position.

  The sheet punching die of the present invention is a molded sheet punching die for punching a formed sheet formed by connecting trays vertically and horizontally into individual trays, and has a holding substrate and a punching blade for punching each tray. A plurality of punching units held on the holding substrate by mounting holes, and holding means for holding the punching units on the holding substrate by the mounting holes, the holding means comprising the punching A tubular member that is loosely inserted into the mounting hole of the extraction unit and is longer than the depth of the mounting hole; a bolt that is formed on the holding substrate and is loosely inserted into the tubular member; and a washer that presses the tubular member onto the holding substrate. And a nut that engages with the bolt and presses the washer, and the nut engages with the bolt and the washer presses and fixes the tubular member to the holding substrate. The punching unit is characterized in that it is held by the holding board movably in accordance with the position of the tray of the molded sheet.

  With this configuration, when the formed sheet is pressed onto the sheet punching die, the punching unit moves following the position of the tray, thereby cutting the tray without causing misalignment at an accurate position on the formed sheet. It can be performed.

  In the above, the structure which provided the elastic body for pushing up the tray after punching may be added to the inner bottom part of the punching blade of the punching unit. Here, examples of the elastic body include sponges, rubbers, springs and the like obtained by firing a known resin.

  In addition, a positioning means for determining the position of the tray can be provided inside the punching blade of the punching unit.

  The positioning means adjusts the position of the tray by supporting a substrate provided on the inner bottom portion of the punching blade of the punching unit and a side surface of the tray along the inner side of the punching blade provided on the substrate. It can be set as the structure provided with the positioning member to determine.

  When the molded sheet is pressed onto the sheet punching die of the present invention, the punching unit moves following the position of the tray, and thus the tray can be cut without causing a positional shift. Accordingly, the tray can be cut at an accurate position even if a dimensional error occurs in the molded sheet due to variations in the thermal shrinkage of the raw material resin, manufacturing conditions, manufacturing lots, and the like. Further, since the position adjustment of the punching unit is not necessary, the work efficiency is improved at each stage.

  Embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

  FIG. 3 partially shows a perspective view of a molded sheet punching die according to an embodiment of the present invention. The molded sheet punching die of the present embodiment is for punching the shimeji tray 11 shown in FIG. 5 from the molded sheet 10 as shown in FIG. The shimeji tray 11 needs to completely block air when wrapped with a transparent film. Therefore, the molded sheet punching die of this embodiment is a tray without a burr 11a as shown in FIG. As shown in FIG. 6, the outer peripheral portion 11b of the upper edge portion of the tray 11 is flat, and is for punching out a tray to which the transparent film can adhere to the entire portion.

  As shown in FIG. 3, the molded sheet punching die of the present embodiment has a number of punching units 20, and each punching unit 20 is arranged vertically and horizontally on a holding substrate 13, as will be described later. 13 is held movably on the surface. As shown in FIG. 3, each punching unit 20 has a punching blade 12 fixed to a pedestal 17, and the shape of the punching blade 12 in plan view is the plan view of the outer periphery of the tray 11 in FIG. The shape is the same.

  Each punching unit 20 is mounted on the holding substrate 13 as shown in FIG. That is, a large number of two bolts 14a and 14b are provided on the holding substrate 13 at a predetermined interval, and the bolts 14a and 14b are larger in diameter than the bolts 14a and 14b. Tubular members 8a and 8b having an inner diameter are loosely inserted. Further, the bolts 14a and 14b and the tubular members 8a and 8b are loosely inserted into the two mounting holes 15a and 15b at the bottom of the punching unit 20, respectively. The mounting holes 15a and 15b of the punching unit 20 are provided at the same intervals as the bolts 14a and 14b. Washers 18a and 18b are passed through the bolts 14a and 14b passed through the tubular members 8a and 8b and the mounting holes 15a and 15b, respectively. The washers 18a and 18b are received in the recesses 16a and 16b provided in the upper portions of the mounting holes 15a and 15b. Further, nuts 19a and 19b are screwed into the bolts 14a and 14b, respectively, and the tubular members 8a and 8b are fixed to the holding substrate 13 by tightening the nuts 19a and 19b.

  FIG. 2 is a cross-sectional view showing a state in which the nut 19a is attached to the one bolt 14a in FIG. 1 through the tubular member 8a, the washer 18a, and the mounting hole 15a. In the present embodiment, as shown in FIG. 2, the inner diameter d of the tubular member 8a is set larger than the outer diameter δ of the bolt 14a. The outer diameter d 'of the tubular member 8a is set smaller than the inner diameter D of the mounting hole 15a. Furthermore, in the present embodiment, the length H of the tubular member 8a is set to be greater than the depth h of the mounting hole 15a. Therefore, by tightening the nut 19a screwed to the bolt 14a, the tubular member 8a is pressed and fixed to the holding substrate 13. Thereby, the punching unit 20 can be moved in a plane parallel to the surface of the holding substrate 13. Further, since the diameter of the nut 19a is sufficiently larger than the inner diameter D of the mounting hole 15a, the punching unit 20 does not fall off from the bolt 14a. The other bolt 14b, tubular member 8b, washer 18b, mounting hole 15b and nut 19b are the same as described above.

  When the tray 11 is punched using the above-described molded sheet punching die, the tray 11 punched inside the punching blade 12 is difficult to take out. In this embodiment, in order to facilitate the removal of the tray 11 after punching, As shown in FIG. 1, a cushion material 21 as an elastic body is placed on the bottom of the punching unit 20. The cushion material 21 is made of a sponge obtained by firing resin. The cushion material 21 is provided with notches 22a and 22b, and the presence of the notches 22a and 22b prevents the cushion material 21 from contacting the bolts 14a and 14b and the nuts 19a and 19b. By providing the notches 22a and 22b, the cushion material 21 is sufficiently compressed when the tray is punched, the tray can be completely punched, and the tray 11 after punching can be easily taken out. In the present embodiment, a slide paper 23 is attached to the upper surface of the cushion material 21 to reduce frictional resistance with a positioning unit 24 described later.

  Furthermore, the molded sheet punching die of this embodiment has a positioning unit 24 that functions as a positioning means so that the punching blade 12 punches the tray 11 at an accurate position. As shown in FIG. 1, the positioning unit 24 includes a substrate 25 placed on the upper surface of the slide paper 23 on the cushion material 21 placed on the inner bottom portion of the punching unit 20, and a positioning provided on the substrate 25. It is comprised by member 26a, 26b, 26c, 26d. Holes 27a and 27b are provided in portions of the substrate 25 corresponding to the bolts 14a and 14b and the nuts 19a and 19b. The diameters of the holes 27a and 27b are set larger than the diameters of the recesses 16a and 16b. The positioning members 26b and 26d are also provided with notches 28a and 28b (28a not shown) corresponding to the holes 27a and 27b.

  The positioning members 26a to 26d are attached to the substrate 25 so as to be along the inside of the punching blade 12 when the positioning unit 24 is placed in the bottom of the punching unit 20, and the side surface 11c (FIG. 4) of the tray 11 is viewed from the outside. It has a shape that can be supported. Further, the shape of the substrate 25 is set to be slightly smaller than the shape in plan view inside the punching blade 12 of the punching unit 20.

  When the tray 11 is punched, when the molded sheet 10 is pressed onto the molded sheet punching die of the present embodiment, the positioning members 26a to 26d follow the side surface 11c of the tray 11, and accordingly, the positioning unit 24 is moved to the holding substrate. 13, the punching unit 20 is pressed to a predetermined position as the positioning unit 24 moves. That is, as described above, the punching unit 20 is not fixed to the holding substrate 13 and can move to some extent within a plane parallel to the holding substrate 13, so that the punching unit 20 is moved along with the movement of the positioning unit 24. Will also move.

  After the tray 11 is punched out, the tray 11 is pushed up by the repulsion of the cushion material 21, so that the tray 11 can be easily taken out. In addition to the cushion material 21, a cushion material (not shown) such as a sponge may be placed on the substrate 25 of the positioning unit 24. If the cushion material is placed at the center of the upper surface of the substrate 25 and a part thereof is also positioned on the positioning members 26a to 26d, not only the tray 11 can be easily taken out after punching but also the lower portion of the tray 11 is It can also serve a protective function.

  In the molded sheet punching die according to the present embodiment, it is not necessary to finely adjust the positions of the individual punching units 20, and even when a dimensional error occurs in the molded sheet for punching out the tray 11, the burrs shown in FIG. The tray 11 can be punched without generating 11a. In addition, since the positioning unit 24 is provided in the present embodiment, the tray 11 can be punched more accurately, and the use of the cushion material 21 facilitates the removal of the tray 11 after punching. Further, if the tubular member 8a is changed to one having a different outer diameter, the gap between the tubular member 8a and the mounting hole 15a changes, so that the movable range of the punching unit 20 on the holding substrate 13 is changed. can do.

  In this embodiment, the case where two fixing bolts 14a and 14b and two mounting holes 15a and 15b are provided for one punching unit 20 has been described. However, the present invention is not limited to this. Alternatively, one punching unit 20 may be provided with one bolt and one mounting hole, or one punching unit 20 may be provided with three or more bolts and mounting holes. The number of fixing bolts and mounting holes may be determined according to the size of the punching unit.

  FIG. 8 partially shows a perspective view of a molded sheet punching die according to another embodiment of the present invention. The molded sheet punching die of this embodiment is for punching a relatively shallow tray, not the deep tray 11 shown in FIG. Therefore, in this embodiment, the punching unit 30 has a flat plate-like pedestal 38, and the punching blade 12 having a low height is mounted on the flat plate-like pedestal 38. Other components of the molded sheet punching die of the present embodiment have the same configuration as that of FIG. 1 described above except that the cushion material 21 and the positioning unit 24 are not included, and corresponding elements are included. Are given the same reference numerals. Further, the cross-sectional view when the nut 19a is attached to the one bolt 14a in FIG. 8 through the tubular member 8a, the washer 18a, and the mounting hole 15a is the same as FIG.

  Since the molded sheet punching die of the present embodiment does not have the positioning unit 24 as described above, the portion of the punching blade 12 follows the tray of the molded sheet. That is, when the tray is punched, when the molded sheet is pressed onto the molded sheet punching die of the present embodiment, the punching blade 12 follows the side of the tray, and accordingly, the punching unit 30 contacts the holding substrate 13. A pressing force is applied in a horizontal plane. As described above, the punching unit 30 is not fixed to the holding substrate 13 and can move to some extent within a plane horizontal to the holding substrate 13, so that the punching unit 30 is also moved with the movement of the punching blade 12. Will move.

  In the molded sheet punching die according to the present embodiment, it is not necessary to finely adjust the position of each punching unit 30, and even when a dimensional error occurs in the molded sheet for punching the tray, the tray is accurately positioned. Can be punched.

  In this embodiment, no cushion material is provided in the punching unit 30, but it goes without saying that a cushion material having a thickness that does not hinder tray punching may be provided inside the punching blade 12. .

  According to the molded sheet punching die of the present invention, the tray can be manufactured even if there is some dimensional error in the molded sheet, so that it can be used in the field of food packaging materials and the like.

FIG. 4 is an exploded perspective view showing a state in which the punching unit is mounted on the holding substrate 13. It is sectional drawing which shows a mode that the nut was attached to the volt | bolt in FIG. 1 through a tubular member, a washer, and an attachment hole. It is a figure which shows partially the perspective view of the shaping | molding sheet punching die which concerns on one Embodiment of this invention. FIG. 4 is a perspective view of a single molded sheet having trays arranged vertically and horizontally. It is a perspective view showing the tray for shimeji. It is a partially broken side view showing the tray without a burr | flash. It is a partially broken side view showing a tray with a burr | flash. FIG. 6 is an exploded perspective view partially showing a perspective view of a molded sheet punching die according to another embodiment of the present invention. It is a disassembled perspective view which shows the conventional molded sheet punching die.

Explanation of symbols

8a, 8b Tubular member
10 Molded sheet
11 trays
12 Punching blade
13 Holding substrate
14a, 14b bolt
15a, 15b Mounting hole
16a, 16b recess
17 pedestal
18a, 18b washer
19a, 19b nut
20, 30 punching unit
21 Cushion material
22a, 22b Notch
23 slide paper
24 Positioning unit
25 Substrate 26a, 26b, 26c, 26d Positioning member
27a, 27b holes
28a, 28b Notch

Claims (4)

A molded sheet punching die for punching molded sheets formed by connecting trays vertically and horizontally into individual trays,
A holding substrate;
A plurality of punching units each having a punching blade for punching the tray, and held by mounting holes on the holding substrate;
Holding means for holding each punching unit on the holding substrate by the mounting hole,
The holding means includes a tubular member that is loosely inserted into the attachment hole of the punching unit and is longer than the depth of the attachment hole, a bolt that is formed on the holding substrate and is loosely inserted into the tubular member, and the tubular member. A washer that presses onto the holding substrate, and a nut that is screwed into the bolt and presses the washer,
The nut is screwed onto the bolt and the washer presses and fixes the tubular member to the holding substrate, so that the punching unit is movable to the holding substrate according to the position of the tray of the molded sheet. Molded sheet punching die characterized by being held.   The molded sheet punching die according to claim 1, wherein an elastic body for pushing up the tray after punching is provided on an inner bottom portion of the punching blade of the punching unit.   The molded sheet punching die according to claim 1 or 2, wherein positioning means for determining the position of the tray is provided inside the punching blade of the punching unit.   The positioning means adjusts the position of the tray by supporting a substrate provided on an inner bottom portion of the punching blade of the punching unit and a side surface of the tray along the inner side of the punching blade provided on the substrate. 4. A molded sheet punching die according to claim 3, further comprising a positioning member to be determined.

Images