JP2017006096A - Drawing device, belt, and drawing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drawing device which draws an object while transferring the object and which can deal with variations in size of the object before drawing without reducing manufacture efficiency and can maintain a fixed quality of the object after drawing.SOLUTION: A drawing device 1 includes: a belt 4 including a placement face 41 placing an object 2 thereon and wrapping the object 2 by causing the vicinity of both edges of the placement face 41 in a width direction to approach each other; and drawing means 5 drawing the object 2 wrapped by the belt 4 along a transfer direction of the belt 4 by repeating contact and separation with respect to an opposite face to the placement face 41 of the belt 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stretching apparatus that stretches an object while transporting the object, a belt for transporting the object, and a stretching method that stretches the object.

  Techniques for pressing and stretching an object are required in various fields. In the food processing field, for example, a technique for stretching shrimp is required when aligning a plurality of shrimp, which are objects, to a predetermined length.

  Shrimp can be stretched manually by the following procedure. First, put shrimp into the mold. Next, the shrimp in the mold is pressed with a pressing rod. Then remove the shrimp from the mold.

  In this procedure, the pressing force depends on the skill level of the person who performs the work manually. Moreover, when extending several shrimp, it takes time in each procedure. Therefore, the manual stretching of shrimp in the above procedure has a limit in stretching a large amount of shrimp. Further, the manual stretching of shrimp in the above procedure has a limit in improving the stability of the quality of the stretched shrimp. Furthermore, when the temperature rise of shrimp affects freshness, it is necessary to cool the shrimp before being put into the mold and the shrimp after being taken out of the mold with ice or the like.

  Patent Document 1 is an example of a stretching apparatus that can efficiently stretch a large number of objects to a certain length without depending on the skill level of a person who performs manually. The stretching apparatus of Patent Document 1 includes a molding member in which a fixed circular space is formed, and a flexible belt conveyor that is inserted into the circular space of the molding member while being deformed along the circular space. .

  The stretching device of Patent Document 1 has a regulating member attached to a belt conveyor at a predetermined interval in the running direction. The belt conveyor is deformed in a state where the object is placed between the regulating members moving back and forth in the traveling direction.

  The cross-sectional area of the regulating member is the same as the maximum cross-sectional area of the object after stretching. The interval between the regulating members moving back and forth in the traveling direction is the same as the maximum length in the traveling direction of the object after stretching.

JP 55-96085 A

  The stretching apparatus of Patent Document 1 cannot cope with variations in the size of an object. If the extending | stretching apparatus of patent document 1 extends the target object which has a big cross-sectional area with respect to the cross-sectional area of a control member, an excessive press may arise locally on a target object.

  The stretching apparatus disclosed in Patent Document 1 is not suitable for stretching an object having a portion whose hardness differs greatly, such as a shrimp body and a tail. In the stretching apparatus of Patent Document 1, the soft portion is stretched even after the hard portion comes into contact with the regulating member, and the hard portion may damage the soft portion, thereby deteriorating the quality.

  In the stretching apparatus of Patent Document 1, in order to cope with variations in the size of an object, it is necessary to change to a regulating member having a different cross-sectional area or to change the spacing of the regulating member. However, it is necessary to stop the stretching device for these changes, which may reduce the production efficiency.

  Therefore, from the above points, the present invention is capable of dealing with variations in the size of the object before stretching without reducing production efficiency, and capable of maintaining the quality of the object after stretching constant. An object of the present invention is to provide a stretching apparatus for stretching an object while transporting the object, a belt for transporting the object, and a stretching method.

  In order to solve the above-mentioned problem, the stretching apparatus according to claim 1 has a mounting surface on which an object is mounted, and approaches or abuts the vicinity of both edges in the width direction of the mounting surface to place the object. A belt to be wrapped; and stretching means for stretching the object wrapped in the belt along the transport direction of the belt by repeatedly contacting and separating from a surface opposite to the placement surface of the belt.

  According to the extending | stretching apparatus of Claim 1, a belt has a mounting surface in which a target object is mounted, and encloses a target object by making the vicinity of the both edges of the mounting surface approach or contact | abut. Accordingly, the object can be softly wrapped and stretched regardless of variations in the size of the object. In addition, since the object is stretched by repeating contact and separation on the surface opposite to the surface on which the belt is placed, it is possible to suppress the occurrence of excessive pressing locally on the object. Since the length of the object wrapped in the belt in the transport direction of the belt is not regulated, the object can be stretched without damaging the object having portions that differ greatly in hardness.

  The stretching apparatus according to claim 2 is the stretching apparatus according to claim 1, wherein the stretching means includes a pair of pivot shafts facing each other in the width direction, and a free roller that is freely rotatable around the pivot shaft. And one or more stretching rollers that can rotate around a rotation axis independent of the pivot shaft, and a holding member that is held by the rotation shaft of these stretching rollers and is fixed to the pivot shaft. The belt that wraps around the object passes between the pair of swiveling shafts in a state in which the vicinity of both edges in the width direction of the placement surface approaches or abuts, and the stretching roller wraps the object Contact and separation are repeated on the surface of the belt opposite to the mounting surface described above.

  According to the stretching apparatus of the second aspect, in addition to acting in the same manner as the stretching apparatus of the first aspect, the stretching roller repeatedly contacts and separates from the opposite surface of the belt on which the object is wrapped from both sides in the width direction. . Thereby, it can suppress more effectively than an excessive press generate | occur | produces locally on a target object.

  The stretching apparatus according to claim 3 is the stretching apparatus according to claim 2, wherein the rotation of the free roller is the same as the transport direction of the belt in a range where the free roller contacts the belt. There is a contact, and the rotation of the stretching roller is within the range where the stretching roller contacts the belt, and there is a contact where the tangential direction of the rotation is the same as the belt transfer direction. In the range where the drawing roller comes into contact with the belt, there exists a contact where the tangential direction of the rotation is opposite to the belt transfer direction.

  According to the stretching apparatus of the third aspect, in addition to acting in the same manner as the stretching apparatus of the second aspect, the tangential direction of the turning of the holding member at the contact point in the above range is opposite to the belt transfer direction. An object to be transferred in the transfer direction can be efficiently stretched. In addition, since the tangential direction of the rotation of the free roller and the stretching roller at the contact point in the above range is the same as the belt transport direction, the contact between the free roller and the stretching roller can minimize the resistance to the belt transport. Therefore, the stretching apparatus according to claim 2 can suppress the generation of friction between the belt, the free roller, and the stretching roller. Further, the suppression of the contact resistance of the roller can suppress an increase in the load of the power source for belt conveyance when the belt conveyance speed is increased, for example.

  A stretching apparatus according to a fourth aspect is the stretching apparatus according to the second or third aspect, wherein the stretching means can adjust the closest approach distance in the width direction of the stretching rollers provided on the pair of pivot shafts.

  According to the stretching device of the fourth aspect, in addition to acting in the same manner as the stretching device of the second or third aspect, the closest approach distance in the width direction of the stretching roller of each swiveling axis can be adjusted, so It can handle objects of size.

  A stretching apparatus according to a fifth aspect is the stretching apparatus according to any one of the second to fourth aspects, wherein a plurality of a pair of swiveling shafts having the free roller, the stretching roller, and a holding member are spaced apart in the belt transfer direction. Arranged.

  According to the stretching apparatus of the fifth aspect, in addition to acting similarly to the stretching apparatus of any one of the second to fourth aspects, the object can be stretched a plurality of times along the belt transfer direction. Thereby, the extending | stretching apparatus can extend | stretch a target object reliably.

  The stretching device according to claim 6 is the stretching device according to claim 5, wherein the stretching means is configured such that the stretching roller is provided on each of the pair of turning shafts from upstream to downstream in the belt transfer direction. The closest approach distance in the width direction is gradually shortened.

  According to the stretching apparatus of the sixth aspect, in addition to acting in the same manner as the stretching apparatus of the fifth aspect, the cross-sectional area of the object can be decreased stepwise and stretched. Thereby, the cross-sectional area of a target object can be reduced suddenly and it can prevent that an excessive press is added to a target object.

  The stretching apparatus according to a seventh aspect is the stretching apparatus according to any one of the second to sixth aspects, wherein the belt further includes two ridges extending in parallel to the belt transfer direction on a surface opposite to the placement surface. The two protrusions protrude in opposite directions in the width direction and are provided on the pair of swiveling shafts in a state in which the vicinity of both edges in the width direction of the mounting surface is approached or brought into contact with each other. Each of the ridges can be inserted into the roller when the belt enclosing the object passes between the pair of pivot shafts in a state in which the belt is close to or in contact with the vicinity of both edges in the width direction. Dents are formed.

  According to the stretching apparatus of the seventh aspect, in addition to acting in the same manner as the stretching apparatus of any one of the second to sixth aspects, the two ridges of the belt are respectively inserted into the recesses of the free roller. Therefore, the belt can move the object in the belt transfer direction while maintaining the state in which the object is softly wrapped.

  The stretching apparatus according to claim 8 is the stretching apparatus according to any one of claims 1 to 7, wherein the belt further includes a central ridge extending in the transport direction of the belt at the center in the width direction on the surface opposite to the placement surface. And a receiving roller having a recess into which the central protrusion can be inserted.

  According to the stretching apparatus of the eighth aspect, the belt operates in the same manner as the stretching apparatus according to any one of the first to seventh aspects, and the belt is transported in the belt transport direction with the central protrusion inserted in the recess of the receiving roller. Therefore, the belt can be prevented from shifting in the width direction. Therefore, the position where the stretching means contacts the surface opposite to the surface on which the belt is placed is a fixed position, and the object can be stably stretched.

  The belt according to claim 9 is a belt that can be transported in a state of wrapping the object, and the belt is placed on a surface on which the object is placed and the surface opposite to the placement surface. Two ridges extending in parallel to the direction, approaching or contacting the vicinity of both edges in the width direction of the placement surface to wrap the object, and the width of the placement surface Two ridges protrude in opposite directions in the width direction with the vicinity of both edges in the direction approaching or in contact with each other, and can be guided while maintaining the state in which the ridges of the book protrude in opposite directions. It has become.

  The belt of claim 9 can be guided while maintaining the state in which the two ridges protrude in opposite directions. As a result, the belt can be transported while maintaining a state in which the object is softly wrapped regardless of variations in the size of the object.

  The stretching method according to claim 10, wherein an object is placed on a wide belt, and the belt is transported from the upstream side to the downstream side in the stretching method in which the object is stretched while being transported by the belt. A step in which the object is supplied to a surface, a step in which the vicinity of both edges in the width direction of the placement surface of the belt is approached or brought into contact with each other, and the object is wrapped. Stretching the object wrapped in the belt along the transport direction of the belt by repeatedly contacting and separating from the surface.

  In the stretching method according to the tenth aspect, the belt has a mounting surface on which the object is mounted, and the vicinity of both edges in the width direction of the mounting surface is brought close to or brought into contact with the belt to wrap the object. Accordingly, the object can be softly wrapped and stretched regardless of variations in the size of the object. In addition, since the object is stretched by repeating contact and separation on the surface opposite to the surface on which the belt is placed, it is possible to suppress the occurrence of excessive pressing locally on the object.

  The stretching apparatus according to any one of claims 1 to 8 has an effect that the object can be softly wrapped regardless of variation in the size of the object before stretching without lowering the production efficiency. Furthermore, the stretching apparatus according to any one of claims 1 to 8 has an effect that the quality of the object after stretching can be maintained constant. In addition, the belt according to claim 9 or the stretching method according to claim 10 has an effect that the object can be softly wrapped regardless of variations in the size of the object.

1 is a schematic side view showing a stretching apparatus according to an embodiment of the present invention. It is a plane schematic diagram of the extending | stretching apparatus of FIG. FIG. 2 is a schematic plan view of the stretching apparatus of FIG. 1, showing a state in which the closest approach distance in the width direction of the stretching roller is gradually shortened from upstream to downstream in the belt transfer direction. FIG. 4 is a schematic plan view of the stretching apparatus in FIG. 3, showing a state in which an upper portion of the stretching means is removed. FIG. 5 is a schematic cross-sectional view of a part of the stretching means taken along the line AA in FIG. FIG. 6 is a schematic side view illustrating the rotation direction of the left turning shaft, the free roller, the stretching roller, and the holding member in FIG. 5.

  A stretching apparatus 1 according to an embodiment of the present invention will be described with reference to the drawings. The belt transfer direction refers to the vertical direction of FIGS. The upstream side in the transfer direction refers to the upper side of FIGS. The downstream side in the transfer direction refers to the lower side of FIGS. The width direction refers to the left-right direction in FIGS.

  The stretching device 1 is a device that stretches the object 2 as shown in FIGS. 1 to 4. The stretching device 1 includes a belt conveyor 3 and stretching means 5.

  The belt conveyor 3 includes an endless annular belt 4 and a gantry 31 for circulating the belt 4.

  The belt 4 is a flexible synthetic resin wide sheet and is formed in an endless annular shape. The outer peripheral surface of the belt 4 is a placement surface 41 on which the object 2 is placed. The object 2 is placed on the placement surface 41 of the belt 4 transferred from the upstream side to the downstream side. The object 2 is, for example, food.

  The mounting surface 41 of the belt 4 has minute irregularities formed on the surface. Due to the minute unevenness, an appropriate grip is generated between the object 2 and the belt 4 that wraps the object.

  The belt 4 further includes two ridges 43 and 43 and a central ridge 44 on the surface 42 opposite to the mounting surface 41. The two ridges 43, 43 extend in parallel with each other in the transport direction of the belt 4 at a predetermined interval in the width direction on the surface 42 opposite to the placement surface 41. The central ridge 44 is parallel to the two ridges 43 in the transport direction of the belt 4 between the two ridges 43, 43 on the surface 42 opposite to the mounting surface 41 and in the center in the width direction. Extend.

  The two ridges 43, 43 and the central ridge 44 are made of a material harder than the material constituting the mounting surface 41 that wraps the object 2.

  The gantry 31 is provided with an upstream pulley 32 that is rotatably supported at the upstream end, and a downstream pulley 33 that is rotatably supported at the downstream end. The downstream pulley 33 is driven to rotate by a motor not shown in the drawing. By driving the downstream pulley 33, the belt 4 can be circulated between the upstream side and the downstream side in the transfer direction of the belt 4.

  When the belt 4 moves from the upstream pulley 32 to the downstream pulley 33, the placement surface 41 of the belt 4 faces upward. The object 2 is placed on the upward placement surface 41 and transferred from the upstream side to the downstream side. On the other hand, when the belt 4 moves from the downstream pulley 33 to the upstream pulley 34, the placement surface 41 of the belt 4 faces downward.

  The gantry 31 is provided with a receiving roller 34 that contacts a surface 42 opposite to the mounting surface 41 of the belt 4 while the belt 4 is directed from the upstream pulley 32 to the downstream pulley 33. An auxiliary pulley 35 that contacts the belt 4 is provided while the belt 4 moves from the downstream pulley 33 toward the upstream pulley 32.

  As shown in FIG. 5, the receiving roller 34 is formed with a recess 34a into which the central protrusion 44 of the belt 4 protruding downward can be inserted. Since the central protrusion 44 is inserted into the recess 34a, the belt 4 can be prevented from shifting in the width direction during the transfer.

  As the belt 4 proceeds from the upstream pulley 32 to the downstream side in the belt 4 transfer direction, the belt 4 is gradually lifted so that both sides in the width direction of the belt 4 are vertically erected.

  As shown in FIG. 5, when the belt 4 reaches the stretching means 5, the vicinity of both edges in the width direction of the placement surface 41 approaches. The belt 4 wraps around the object 2 when the vicinity of both edges in the width direction of the mounting surface 41 approaches.

  In a state in which the vicinity of both edges in the width direction of the mounting surface 41 is approached, the two protrusions 43 and 43 protrude in opposite directions in the width direction. Even in the state in which the vicinity of both edges in the width direction of the mounting surface 41 is approached, the central protrusion 44 continues to protrude downward.

  The central ridge 44 also plays a role of preventing the space in which the mounting surface 41 wraps the object 2 from being collapsed more than necessary in the width direction in a state in which the vicinity of both edges in the width direction of the mounting surface 41 is approached.

  The central ridge 44 is made of a material harder than the placement surface 41. Since the central ridge 44 is inserted into the recess 34a, the belt 4 enclosing the object 2 is prevented from shifting in the width direction. Therefore, the extending force of the extending means 5 is efficiently transmitted to the object 2.

  The stretching means 5 is provided on the downstream side of the belt 4 in the transport direction from the position where the object 2 is supplied to the belt 4.

  The stretching means 5 includes a stretching means base 6, a shaft support plate 7, a shaft support plate adjusting mechanism 8, a pair of turning shafts 51a to 51e, a free roller 52, a stretching roller 53, and a holding member 54. .

  The stretching means base 6 is provided above the base 31. A rectangular hole 62 is formed in the center of the upper plate 61 of the stretching means mount 6. A pair of shaft support plates 7 and 7 are provided on the upper plate 61 so as to close the rectangular hole 62.

  As shown by an arrow α in FIG. 2, the shaft support plates 7 and 7 can be separated from and approach each other on the upstream side around a fulcrum 71 on the downstream side.

  The shaft support plate adjusting mechanism 8 adjusts the distance on the upstream side of the shaft support plates 7 and 7 that can be separated from each other. The shaft support plate adjusting mechanism 8 includes a support plate 81 provided on the upstream side of the upper plate 61 of the extending means base 6, a cutting bolt 82 rotatably supported by the support plate 81, and the cutting bolt 82. A nut portion 83 provided on both sides of the support plate 81 in the width direction, and threaded portions 84 and 84 which are screwed to both ends of the cutting bolt 82 and attached to the shaft support plates 7 and 7, respectively. Have

  The dimensioning bolt 82 and the nut portion 83 rotate together. When the nut portion 83 is rotated by hand or a spanner, the dimensioning bolt 82 is rotated. As the cutting bolt 82 rotates, the screwing portions 84 and 84 approach or separate in the width direction. When the screwing portions 84 and 84 approach or separate in the width direction, the interval on the upstream side of the shaft support plates 7 and 7 can be adjusted.

  The shaft support plates 7 and 7 respectively support the plurality of turning shafts 51 a to 51 e at intervals in the belt 4 transfer direction. The pivot shafts 51a to 51e that are pivotally supported by the respective shaft support plates 7 are a pair of pivot shafts in which the respective pivot shafts having the same sign face each other in the width direction.

  Each of the turning shafts 51a to 51e is turned by a driving device such as a motor not shown in the drawing.

  As shown in FIG. 1, each of the turning shafts 51 a to 51 e is provided below the shaft support plate 7 with a free roller 52 that is freely rotatable about the turning shafts 51 a to 51 e. As shown in FIG. 5, the free roller 52 has a recess 52a in the circumferential direction.

  Hereinafter, in FIG.5 and FIG.6, although the turning shaft 51e is demonstrated, the turning shafts 51a-51d also have the same structure, and have the same effect.

  As shown in FIG. 5, the recesses 52a of the free rollers 52 of the pair of turning shafts 51e and 51e face each other in the width direction at the closest position. As shown in FIG. 5, when the belt 4 wrapping the object 2 passes between a pair of turning shafts 51 e and 51 e in a state in which the vicinity of both edges in the width direction of the mounting surface 41 is approached, the ridge 43 Can be inserted into the recess 52a.

  The two ridges 43, 43 of the belt 4 are inserted into the recesses 52a of the free rollers 52 of the pair of turning shafts 51e, 51e facing each other in the width direction, so that the ridges 43, 43 protrude in opposite directions. The belt 4 is guided while maintaining the state.

  The belt 4 is a flexible synthetic resin as described above. Therefore, in the state where the vicinity of both edges in the width direction of the placement surface 41 is approached, the original placement surface 41 tries to return to a flat state. Therefore, it is urged | biased in the direction in which the width direction both edge vicinity of the mounting surface 41 leaves | separates. The two ridges 43 of the belt 4 are each biased in a direction to maintain the state of being inserted into the recess 52 a of the free roller 52.

  Since the central ridge 44 is made of a hard material, when the vicinity of both edges in the width direction of the mounting surface 41 is approached, a force for returning the original mounting surface 41 to a flat state is increased. Play a role.

  As shown in FIGS. 5 and 6, in each swivel shaft 51 e, below the free roller 52, four stretching rollers 53 that can rotate around a rotation shaft 53 a independent of each swivel shaft 51 e, and these Holding members 54 and 54 for holding the rotation shaft 53 a of each stretching roller 53 are provided above and below the four stretching rollers 53.

  As shown in FIGS. 5 and 6, the holding members 54 and 54 are fixed to the respective turning shafts 51 e. When each turning shaft 51e turns, the holding members 54 and 54 turn integrally with each turning shaft 51e.

  As shown in FIG. 5, the belt 4 wrapping the object 2 passes between the pair of turning shafts 51 e and 51 e in a state in which the vicinity of both edges in the width direction of the placement surface 41 is approached or brought into contact. Further, when the holding member 54 rotates, each stretching roller 53 repeats contact and separation with the surface 42 opposite to the placement surface 41 of the belt 4 that wraps the object 2. The object 2 is pressed by the contact of each stretching roller 53, and the object 2 can be stretched along the transfer direction of the belt 4.

  The turning shaft turning shaft 51e rotates in the direction of arrow β in FIG.

The free roller 52 rotates in the direction of arrow γ in FIG. In a range where the free roller 52 contacts the belt 4, the tangential direction of the rotation of the free roller 52 has a contact point that is the same as the transfer direction of the belt 4.

  The stretching roller 53 rotates in the direction of the arrow δ in FIG. In a range where the stretching roller 53 is in contact with the belt 4, the tangential direction of the rotation of the stretching roller 53 has a contact point that is the same as the transport direction of the belt 4.

  The holding member 54 turns in the direction of the arrow ε in FIG. In the range where the stretching roller 53 contacts the belt 4, the tangential direction of the rotation of the holding member 54 has a contact point that is opposite to the transport direction of the belt 4.

  Along with the turning of the holding member 54, the stretching roller 53 presses the object 2 while contacting the surface 42 opposite to the placement surface 41 of the belt 4 that wraps the object 2 from the downstream side to the upstream side. By such pressing by the stretching roller 53, the object 2 can be stretched from the downstream side toward the upstream side along the transfer direction of the belt 4.

  The target object 2 may have a part from which hardness differs greatly. Even in this case, by placing the hard portion on the downstream side in the transport direction, the soft portion can be extended from the downstream side toward the upstream side along the transport direction of the belt 4. Therefore, the object 2 can be stretched without damaging the soft part with the hard part.

  It is possible to adjust the closest distance in the width direction of the stretching roller 53 between the pivot shafts 51e and 51e. For example, the closest approach distance in the width direction of the stretching roller can be adjusted by replacing the stretching roller with a different diameter.

  As shown in FIGS. 3 and 4, the stretching means 5 is closest in the width direction of the stretching roller 52 provided on each of the pair of turning shafts 51 a to 51 e as it goes from upstream to downstream in the transport direction of the belt 4. The distance is getting shorter.

  As shown in FIGS. 3 and 4, the upstream space of the shaft support plates 7 and 7 can be adjusted by using the shaft support plate adjusting mechanism 8 described above. By this adjustment, the ratio at which the closest approach distance in the width direction of the stretching roller 52 becomes shorter as it goes from upstream to downstream in the transfer direction of the belt 4 can be freely changed.

  Hereinafter, a method for stretching an object by the stretching apparatus 1 will be described.

  First, the object 2 is supplied to the flat stacking surface 41 of the belt 4 transferred from the upstream pulley 32 to the downstream side.

  Next, the vicinity of both edges in the width direction of the placement surface 41 of the belt 4 is brought close to wrap the object 2. In a state in which the vicinity of both edges in the width direction of the mounting surface 41 is approached, the two protrusions 43 and 43 protrude in opposite directions in the width direction.

  Next, the belt 4 enclosing the object 2 passes between the pair of turning shafts 51a and 51a and between the pair of turning shafts 51e and 51e. In the stretching means 5, the belt 4 is guided while maintaining the state in which the two ridges 43, 43 protrude in opposite directions in the width direction by the recesses 52a of the free rollers 52, respectively. During this passage, the stretching roller 53 repeatedly contacts and separates from the surface 42 opposite to the mounting surface 41 of the belt 4, so that the object 2 wrapped in the belt 4 is stretched along the transport direction of the belt 4. Let

  Next, the belt 4 that has passed through the stretching means 5 gradually returns to the flat loading surface 41. The belt 4 heads toward the downstream pulley 33 in a state where the object 2 extended on the stacking surface 41 is placed.

  In the said embodiment, although the thing of the target object of FIG.2 and FIG.3 was displayed in the transfer direction, it is not limited to this. The stretching apparatus, belt, and stretching method of the present invention can be applied to objects having various shapes.

  Although the said embodiment demonstrated the case where the width direction both edge vicinity of the mounting surface 41 approached and encloses the target object 2, it is not limited to this. In the stretching apparatus, the belt, and the stretching method of the present invention, the vicinity of both edges in the width direction of the placement surface may come into contact to wrap the object.

  In the above embodiment, the case where the four extending rollers 53 are provided on each of the pivot shafts has been described. However, the present invention is not limited to this. In the stretching apparatus and the stretching method of the present invention, for example, a plurality of stretching rollers other than one or four may be provided on each pivot shaft.

DESCRIPTION OF SYMBOLS 1 Stretching apparatus 2 Object 3 Belt conveyor 4 Belt 5 Stretching means 6 Stretching means mount 7 Shaft support plate 8 Shaft support plate adjustment mechanism 31 Mount 32 Upstream pulley 33 Downstream pulley 34 Receiving roller 34a Recess 35 Auxiliary pulley 41 Placement surface 42 Surface opposite to the mounting surface 43 Projection 44 Central projection 51a to 51e Rotating shaft 52 Free roller 52a Free roller recess 53 Stretch roller 53a Rotating shaft 54 Holding member 81 Support plate 82 Cut bolt 83 Nut portion 84 Threaded Part

Claims (10)

A belt that wraps the target object, having a mounting surface for mounting the target object, approaching or contacting the vicinity of both edges in the width direction of the mounting surface;
The belt is provided with stretching means for stretching the object wrapped in the belt along the belt transfer direction by repeating contact and separation with a surface opposite to the placement surface of the belt. Stretching device. The stretching means is
A pair of pivots facing each other in the width direction;
A free roller provided so as to be freely rotatable around the pivot axis;
One or more stretching rollers rotatable around a rotation axis independent of the pivot axis;
Holding the rotary shaft of these stretching rollers, and holding member fixed to the pivot shaft,
The belt that wraps around the object passes between the pair of pivot shafts in a state in which the vicinity of both edges in the width direction of the mounting surface is approached or abutted,
The stretching apparatus according to claim 1, wherein the stretching roller repeats contact and separation on a surface opposite to the mounting surface of the belt that encloses the object. As for the rotation of the free roller, in the range where the free roller is in contact with the belt, there is a contact where the tangential direction of the rotation is the same as the transfer direction of the belt,
As for the rotation of the stretching roller, in the range where the stretching roller is in contact with the belt, there is a contact where the tangential direction of the rotation is the same as the transport direction of the belt,
3. The stretching according to claim 2, wherein the holding member is swung in a range in which the tangent direction of the swirling roller is in contact with the belt in a range in which the swiveling roller is in contact with the belt. apparatus.   4. The stretching apparatus according to claim 2, wherein the stretching means is capable of adjusting a closest approach distance in the width direction of the stretching rollers respectively provided on the pair of turning shafts.   The stretching according to any one of claims 2 to 4, wherein a plurality of a pair of swiveling shafts having the free roller, the stretching roller, and a holding member are disposed at intervals in the belt transfer direction. apparatus.   In the stretching means, the closest approach distance in the width direction of the stretching rollers respectively provided on the pair of turning shafts is gradually shortened from upstream to downstream in the belt transfer direction. The stretching apparatus according to claim 5. The belt further includes two ridges extending in parallel with the belt transfer direction on a surface opposite to the placement surface, and approaches or contacts the vicinity of both edges in the width direction of the placement surface. In the state, the two ridges protrude in opposite directions in the width direction,
A free roller provided on each of the pair of swiveling shafts has a gap between the pair of swiveling shafts in a state where the belt enclosing the object approaches or contacts the vicinity of both edges in the width direction of the mounting surface. The stretching device according to any one of claims 2 to 6, wherein a recess is formed into which each of the protrusions can be inserted when passing. The belt further has a central ridge extending in the transport direction of the belt at the center in the width direction on the surface opposite to the mounting surface,
The stretching apparatus according to any one of claims 1 to 7, further comprising a receiving roller in which a recess into which the central protrusion can be inserted is formed. A belt that can be transported in a state of wrapping an object,
A placement surface on which the object is placed;
On the surface opposite to the mounting surface, two ridges extending in parallel with the belt transfer direction,
Approaching or contacting the vicinity of both edges in the width direction of the placement surface, and enveloping the object,
In the state in which the vicinity of both edges in the width direction of the placement surface is approached or brought into contact, the two protrusions protrude in opposite directions in the width direction,
A belt capable of being guided while maintaining a state in which the two ridges protrude in opposite directions in the width direction. In a stretching method in which an object is placed on a wide belt and the object is stretched while being transferred by the belt,
A step of supplying the object to the placement surface of the belt transferred from the upstream side to the downstream side;
Wrapping the object by approaching or contacting the vicinity of both edges in the width direction of the placement surface of the belt, and
Stretching the object encased in the belt by repeatedly contacting and separating from the surface opposite to the placement surface of the belt, and stretching the object along the belt transfer direction. .

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