Abstract:
A method for producing a food shaped as a continuous bar by placing a continuous inner material on a continuous strip of an outer layer material that is transferred on a former belt, comprising the steps of placing food material that includes the inner material placed on the strip of the outer layer material in a channel space defined by the former belt while it is running; and shaping part of the former belt that is located at the channel space as a sleeve by pushing and joining edges of the former belt by a pushing device to allow edges of the outer layer material to be joined.

Description:
FIELD OF THE INVENTION 
     This invention relates to a method and an apparatus for producing a piece of food shaped as a continuous bar that has an inner material such as jam or other filling and an outer layer material (e.g. dough) that surrounds the inner material. The invention also relates to a belt conveyor used for producing the continuous piece of food. 
     DESCRIPTION OF THE PRIOR ART 
     Japanese Patent 8-242750 A (prior art 1) and Japanese Patent 2896503 B (prior art 2) disclose such a method, apparatus, and belt conveyor. 
     In prior art 1, a continuous outer layer material is shaped as a strip and placed on an endless belt conveyor that runs horizontally, and a continuous inner material shaped as a bar, which is to be surrounded by the outer layer material, is placed on the strip of the outer layer at its center (center of its width). Both edges of the upper part of the endless, horizontal belt conveyor are then forced to curve upward by rollers so that the outer layer material surrounds the inner material. 
     Since in prior art 1 the horizontal belt conveyor is arranged so that both edges of its upper part are curved upward, the belt conveyor will be rather long in the direction that it runs, and the edges are subjected to great tension, thereby causing a problem in that the life of the belt conveyor is shortened. 
     Prior art 2 discloses a belt conveyor that comprises a V-shaped belt located at the center of the belt conveyor (center of Its width), a base belt disposed around the outer periphery of the V-shaped belt so that the base belt and the V-shaped belt form one body, and a plurality of strip belts disposed around the outer periphery of the base belt, which strip belts are arranged along the path in which the belt conveyor runs. In this belt conveyor the strip belts can be easily curved upward to wrap an inner material by an outer layer material that is placed on the belt conveyor. However, the structure of the belt conveyor is complicated. Further, part of the outer layer material or powder used or both may be caught between the strip belts and they may remain there. This requires troublesome cleaning of the strip belts. 
     The purpose of the present invention is to resolve this problem and those drawbacks of the prior art discussed above. 
     SUMMARY OF THE INVENTION 
     The method of the present invention for producing a piece of food shaped as a continuous bar by placing a continuous inner material on a continuous outer layer material that is shaped as a strip and transferred includes the steps of placing food material that includes the inner material placed on the strip of the outer layer material in a channel (or groove) space (or passage) defined by a former belt while it is running, and shaping the former belt into a sleeve such that both edges of the former belt are joined to shape the strip of the outer layer material as a sleeve that surrounds the inner material. 
     In one aspect of this invention the edges of the former belt are pressed together by pushing means or a plurality of especially-shaped guiding former members. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view showing a first embodiment of the apparatus of the present invention. 
         FIG. 2A  is a cross-sectional view taken along the cutting line A—A in  FIG. 1 . 
         FIG. 2B  is a cross-sectional view taken along the cutting line B—B in  FIG. 1 . 
         FIG. 2C  is a cross-sectional view taken along the cutting line C—C in  FIG. 1 . 
         FIG. 2D  is a cross-sectional view taken along the cutting line D—D in  FIG. 1 . 
         FIG. 3  is a perspective view showing a second embodiment of the apparatus of the present invention. 
         FIG. 4A  is a cross-sectional view corresponding to  FIG. 2A  of the first embodiment, showing the inner material, the outer layer material, and the conveyor in the second embodiment. 
         FIG. 4B  is a cross-sectional view corresponding to  FIG. 2B  of the first embodiment, showing the inner material, the outer layer material, and the conveyor in the second embodiment. 
         FIG. 4C  is a cross-sectional view corresponding to  FIG. 2C  of the first embodiment, showing pushing members in the second embodiment to join the edges of the former belt. 
         FIG. 4D  is a cross-sectional view similar to  FIG. 4C , showing the pushing members being moved away from the edges of the former belt. 
         FIG. 5A  is a cross-sectional view showing an alternative belt conveyer, which can be used in the first and second embodiments. 
         FIG. 5B  is a cross-sectional view of the alternative belt conveyer, showing guiding members for the belt conveyer. 
         FIGS. 6A ,  6 B, and  6 C are cross-sectional views showing the steps of the operation of alternative pushing members. 
         FIGS. 7A ,  7 B, and  7 C are cross-sectional views showing the steps of the operation of alternative pushing members. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Below the embodiments of the present invention are explained in detail by reference to the accompanying drawings. 
       FIG. 1  and  FIG. 2  ( FIGS. 2A–2D ) show the first embodiment of the apparatus  1  of the invention for producing a piece of food shaped as a continuous bar. In  FIG. 1  the apparatus  1  is located between a transfer conveyer system  9  (to the right in the drawing) and a cutting machine (not shown) that cuts a produced piece of food shaped as a continuous bar (to the left in the drawing). The conveyor system  9  includes a transfer conveyor  7  that carries a continuous strip of an outer layer material  3  (e.g., dough), which is supplied by a device (not shown) for supplying a continuous strip of an outer layer material, and a continuous food material  5  shaped as a bar (e.g., jam or other filling), which is continuously supplied by a device (not shown) for supplying an inner material. The bar-like food material  5  is used as an inner material to be surrounded by the outer material  3 . 
     As shown in  FIG. 1 , the apparatus  1  has a conveyor belt  17  comprising endless, two-layer belts, namely, a base belt (inner belt)  15  and a former belt (outer belt)  13 , which is disposed on or above the outer surface of the inner belt  15 . The conveyor belt  17  is supported and guided by a first guide roller  19  located at the upstream end (i.e., the starting end) of the conveyor belt  17  and a second guide roller  21  located at the downstream end (i.e., the turning end). Further, a plurality of intermediate rollers  23 A,  23 B, and  23 C, which are properly spaced apart from each other, are disposed between the first and second guide rollers  19 ,  21 . These intermediate rollers  23 A,  23 B, and  23 C guide the lower part of the endless conveyor belt  17 . By operating a controlling motor (not shown), the food materials (inner material  5  and outer layer material  3 ) are transferred to the left (in  FIG. 1 ). 
     The endless conveyor belt  17  is so arranged that the central parts of both the inner and outer belts are fixed to each other by using proper fixing tools or an adhesive. The outer, former belt  13  is made of flexible material, so that it can be deformed into a sleeve when both edges of it are joined in a line parallel to the centerline of the conveyor belt  17 . 
     A plurality of rollers  25  (e.g., 4 rollers, as shown in  FIG. 1 ), for depressing and guiding the upper part of the endless, inner belt  15  at its upper surface, are disposed between and at a lower level of the first and second guide rollers  19 ,  21 . These depressing rollers  25  are rotatably mounted on side frames (not shown) disposed at both sides of the conveyor belt  17 . Since the rollers  25  depress the inner belt  15 , they lower the central part of the upper part of the endless, outer belt  13  through the central part of the endless, inner belt  15 , which part is fixed to the corresponding central part of the outer belt  13 , thereby defining a channel (or groove) space in the upper part of the endless outer belt. 
     In the groove space the inner, base belt  15  is in a tensioned state due to the depressing rollers  25 , but the upper surfaces of both sides of the inner, former belt  13  are free from any depression. Thus they can be easily curved upward without applying a great tension. 
     Two pairs of vertical, former rollers (rolls)  27 ,  27  are rotatably supported on brackets that are disposed at both sides of the channel space. The former rollers  27 ,  27  are located between the two pairs of depressing rollers  25 ,  25 , with one pair ( 25 ,  25 ) located upstream and the other pair downstream of the channel space. Each former roller  27  has a curved outer surface  27 G (e.g., a semicircular cross section) so that the outer belt  13  will be deformed in the shape of a sleeve when it passes between the former rollers  27  and  27 , which are arranged at the sides of the channel space. The deformed outer belt  13  allows the outer layer material  3  to be wrapped around the inner material  5 . 
     The brackets (not shown), which carry the former rollers  27 , may be vibratingly moved in the right and left directions by actuators such as pneumatic actuators (not shown) such that the former rollers  27 ,  27 , located at the sides of the channel space, closely approach each other (thereby securing the edges of the outer belt  13  to each other) and move away from each other. By those vibrations, repeated forces are applied to the outer belt  13  and hence to the outer layer material  3 , so that the outer layer material  3  securely wraps the inner material  5 , and so that the edge surfaces  3 A ( FIG. 2C ) of the outer layer are joined. 
     Some steps of the operation of the apparatus explained above are shown in  FIGS. 2A–2D . 
       FIG. 2A  shows the bar-like inner material  5  and the strip of the outer layer material  3  carried on the endless belt conveyor  17  at the position shown by cutting line A—A. As the inner material  5  and the outer layer material  3  come to the position shown by cutting line B—B, the inner belt  15  is lowered by the depressing rollers  25 ,  25 , and thus the central part of the outer belt  13  is lowered by the inner belt  15 , so that the channel passage is formed in the outer belt  13 . 
     As in  FIG. 2C , when the materials  3  and  5  come to the position shown by cutting line C—C, the former rollers  27 ,  17  are laterally vibrated to be made to come close to or move away from each other to make the outer belt  13  be in the shape of a sleeve, and to allow the edges of the belt  13  to be joined. Thus, as previously explained, the outer layer material  3  is to be wrapped around the inner material  5 , and the edge surfaces  3 A of the outer layer material engage with each other. The produced continuous piece of food, which is shaped as a bar (Fig. D), Is then moved away by a conveyor such as a conveyor  9 B (shown in  FIG. 3 ). 
     Now, the second embodiment is explained with reference to  FIG. 3  and  FIG. 4  ( FIGS. 4A–4D ). Also, some alternative examples are explained in  FIGS. 5 ,  6 , and  7 . In these FIGS. ( 3 – 7 ) the same or similar numbers are used for the same or similar elements. 
     The apparatus  1  of the second embodiment shown in  FIGS. 3 and 4  is similar to the apparatus  1  of the first embodiment shown in  FIGS. 1 and 2  and differs in that it uses former rollers  28  and a pushing device  29  to make the outer layer material  3  be in the shape of a sleeve, instead of using the former rollers  27  that have a curved surface as in the first embodiment. Other elements function the same as those of the first embodiment. Thus no further explanation is made for those elements. 
     Each former roller  28  has a straight outer surface as shown in  FIGS. 3 and 4B . Thus, when the endless belt conveyor  17  shown in  FIG. 4A  comes to the groove passage, the outer, former belt  13  is bent like a “U” by the depressing rollers  25 ,  25 , the inner belt  15 , and the former rollers  28 ,  28 , as in  FIG. 4B . The edges of the outer belt  13  are then (preferably, repeatedly or vibratingly) pushed and joined together by pushing members  35 A,  35 B that are (preferably, vibratingly and) slantwise moved to join the edges. 
     The mechanism of the pushing device  29  that includes the pushing members  35 A,  35 B is now briefly explained. 
     The two pairs of pushing members  35 A,  35 B are symmetrically arranged at both sides of the groove passage and fixedly mounted on C-shaped frames  37   a ,  37 B through attaching bars  35 A. The C-shaped frames  37 A (located at one side of the groove passage) are connected to sliders  41 A, and the C-shaped frames  37 B, located at the other side, are connected to sliders  41 B. The sliders  41 A and  41 B are symmetrically slanted and are slidable in the notches  39 A and  39 B, respectively, which notches are formed in plates  31 A,  31 B. These plates are connected by bars  30  to form a frame  33 . 
     An actuator  47 , which is vertically moved, for example, by a servomotor, is disposed between the plates  31 A,  31 B. The actuator  47  operates to rotate crank members  49  to vertically move the sliders  41 A,  41 B through connecting rods  45  and guide members  43 . Since the sliders  41 A,  41 B move slantwise simultaneously in the same direction. C-shaped frames  37 A,  37 B and the pushing members  35 A,  35 B move slantwise and simultaneously in the same direction, as shown by slanted arrows in  FIGS. 3 ,  4 C, and  4 D. The forces applied slantwise to the outer layer material better secure the bonding of the edge surfaces of the outer layer material. 
     Since the width of inner belt  15  is less than that of the outer, former belt  13 , powder, if it is used, would not enter between the inner and outer belts. 
     Although in the first and second embodiments the conveyer belt  17  that has two-layer belts is used, a conveyer belt of a single layer may be used. In that case, the degree of the tension of the part of the single-layer conveyer belt between the rollers  19  and  21  is adjusted, and the former rollers  27  in the first embodiment or the former rollers  28  and the pushing device  29  are arranged to be located between the rollers  19  and  21 . 
       FIG. 5  shows an alternative example of the endless belt conveyer  17 . As shown in  FIG. 5A , the inner, base belt  15 , which is fixed to the outer, forming belt  13 , is narrow and in the shape of a trapezoid. As shown in  FIG. 5B , the trapeziform base belt  15  may be guided to a lower position by two guide members  25 A instead of the depressing rollers  25 , which guide members  25 A have a shape complementary to the shape of the base belt  15 . 
       FIG. 6  shows an alternative example of the pushing members  35 A,  35 B shown in  FIGS. 3 and 4 . As shown in  FIG. 6A , each of the pushing members  35 A,  35 B has two members, namely, an upper pushing member  35 U and a lower pushing member  35 L. The lower pushing member  35 L is located at the distal end of a plate member  35 P, and the upper pushing member  35 U is placed on the plate member  35 P. The upper pushing member  35 U is made of resilient material. 
     Thus, when the former belt  13  is deformed as a “U” as explained for the second embodiment, the pushing members  35 A,  35 B approach the edges of the former belt  13  to form the U-shaped belt  13  as a sleeve. During this operation the upper pushing members  35 U,  35 U first contact the edges of the former belt  13 , and then the lower pushing members  35 L,  35 L contact the parts of the belt  13  at the points just below the edges, as shown in  FIGS. 6A ,  6 B, and  6 C. This structure is advantageous in that the outer layer material will not escape from the closed former belt  13  shaped as a sleeve, since its edges are joined first, and then the lower parts of them are pushed together. 
       FIG. 7  shows an alternative example of the upper pushing member  35 U shown in  FIG. 6 . The upper pushing member  35 U of this alternative example has two members, namely, a distal, movable member  35 M provided with a spring S (e.g., a coil spring) at its rear and a proximal member (no number is assigned to it) held in the plate member  35 P. The distal, movable member  35 M is connected to the proximal member through the spring S. This structure of the pushing member functions the same as do the pushing members  35 A,  35 B shown in  FIG. 6 . 
     The embodiments and examples explained above are exemplary only, to explain the present invention. One skilled in the art will understand that other variations and modifications can be made without departing from the spirit of the present invention.