JP6772755B2 - Recording material binding device and recording material aftertreatment device - Google Patents

Description

The present invention relates to a recording material binding device and a recording material aftertreatment device.

There is known a recording material binding device in which a plurality of stacked recording materials are sandwiched between a pair of dentitions that mesh with each other and pressure is applied to deform them into a wavy shape and bond them to each other. In such a recording material binding device, the meshing height of each tooth of the meshing dentition has a value suitable for the thickness of the recording material bundle. When the recording material bundle is thin, the recording material can be deformed into a wavy shape even if the tooth engagement height is small. However, when trying to bind a thick recording material bundle with a dentition having a small meshing height, the recording material may not be sufficiently deformed until the recording materials are bonded to each other. When the recording material bundle is thick, it can be dealt with by using a dentition having a large meshing height. On the other hand, when trying to bind a thin recording material bundle with a dentition having a large meshing height, the recording material may be torn, and therefore the recording materials may not be bonded to each other.

In Patent Document 1 below, the thickness of the recording material bundle is different by providing two dentitions having different meshing heights between teeth, or by providing a portion having different meshing heights in one tooth. Corresponding devices are listed.

Japanese Unexamined Patent Publication No. 2016-79000

In order to cope with both the case where the recording material bundle is thin and the case where the recording material bundle is thick, a dentition having two types of meshing heights is provided, and in a recording material binding device that simultaneously sandwiches the recording material bundle, two types of dentition are provided. If the tooth tip widths are the same, the meshing height is small, so that the binding force may be weakened when a thin bundle of recording materials is bound.

An object of the present invention is to increase the binding force of a recording material bound by a tooth having a small meshing height as compared with a case where the tooth tip width of the tooth is the same as that of a tooth having a large meshing height.

The invention according to claim 1 is a first dentition composed of a plurality of teeth arranged in a tooth alignment direction and a second dentition composed of a plurality of teeth and meshing with the first dentition, which cooperates with the first dentition. Including the second dentition, which works to sandwich the recording material bundle and bind the recording material, the first dentition and the second dentition are in the teeth belonging to the first dentition and the second dentition in the tooth alignment direction. The first section in which the meshing height of the belonging teeth is the first meshing height and the width of the effective tooth tip is the first effective tooth tip width, and the second meshing height in which the meshing height is smaller than the first meshing height. It is a recording material binding device having a second section in which the width of the effective tooth tip is larger than the width of the first effective tooth tip and is the width of the second effective tooth tip.

The invention according to claim 2 is the recording material binding device according to claim 1, wherein at least the tip portion of each tooth has a trapezoidal shape extending from the tooth tip toward the tooth root side when viewed from the tooth alignment direction.

In the invention according to claim 3, the tooth length and tip width of the tooth in the first section and the tooth in the second section are different in at least one of the first dentition and the second dentition, and each belongs to the second section. The recording material binding device according to claim 2, wherein the two oblique sides of the tooth trapezoidal shape overlap the two oblique sides of the tooth trapezoidal shape belonging to the first section when viewed from the tooth alignment direction.

In the invention according to claim 4, the first dentition and the second dentition are related to the first side surface in which the first section is arranged at both ends in the tooth alignment direction and is the same side surface of the first dentition and the second dentition. In each of the above, when viewed from the tooth alignment direction, one oblique side of the trapezoidal shape of each tooth belonging to the second section overlaps with one oblique side of the trapezoidal shape of each tooth belonging to the first section, and the first tooth With respect to the row and the second side surface opposite the first side surface of the second dentition, the trapezoidal shape of each tooth belonging to the second section when viewed from the tooth alignment direction in at least one of the first dentition and the second dentition. The recording material binding device according to claim 2, wherein the other oblique side of the shape is located outside the other oblique side of the trapezoidal shape of each tooth belonging to the first section.

In the invention according to claim 5, the recording material to be bound is rectangular, the tooth alignment directions of the first and second dentitions are along the direction intersecting the sides of the recording material, and the first dentition and the second dentition The recording material binding device according to claim 4, wherein the second side surface of the dentition faces the corners of the recording material and sandwiches the corners of the recording material bundle.

The invention according to claim 6 is the recording material binding device according to any one of claims 2 to 5, wherein the angle of the hypotenuse of the trapezoidal shape of each tooth is 60 ° or more with respect to the height direction. ..

In the invention according to claim 7, the recording material accumulating portion in which a plurality of rectangular recording materials are accumulated to form a recording material bundle, and the first dentition and the second dentition face the corners of the recording material bundle. So that the tooth alignment directions of the first and second dentitions intersect the sides of the recording material bundle, and the second side surface of the first dentition and the second dentition is the recording material bundle. The recording material post-processing device comprising the recording material binding device according to claim 4, which is arranged with respect to the recording material accumulating portion so as to face a corner.

The invention according to claim 8 is described in any one of claims 1 to 3, wherein the invention has at least one of a first section and a second section, and the first section and the second section are arranged alternately. It is a recording material binding device.

The invention according to claim 9 is the recording material binding device according to claim 6, wherein first sections are arranged at both ends in the tooth alignment direction.

The invention according to claim 10 is the recording material binding device according to claim 9, wherein the center of each effective tooth tip in the tooth width direction is deviated in the tooth width direction between the first section and the second section.

In the invention according to claim 11, the recording material to be bound is rectangular, and the tooth alignment directions of the first and second dentitions are along the direction intersecting the sides of the recording material, and the teeth belong to the first section. The recording material binding according to claim 10, wherein the corner of the recording material bundle is sandwiched in a posture in which the deviation direction of the center of the effective tooth tip of the tooth belonging to the second section with respect to the center of the effective tooth tip faces the corner of the recording material. It is a device.

In the invention according to claim 12, the recording material accumulating portion in which a plurality of rectangular recording materials are accumulated to form a recording material bundle, and the first dentition and the second dentition face the corners of the recording material bundle. As such, so that the tooth alignment directions of the first and second dentitions intersect the sides of the recording material bundle, and toward the corners of the recording material bundle, the effective teeth of the teeth belonging to the first section. The recording material binding device according to claim 10, which is arranged with respect to the recording material accumulating portion so that the center of the effective tooth tip of the tooth belonging to the second section is deviated from the center of the tip. It is a recording material aftertreatment device.

The invention according to claim 13 is the recording material binding device according to any one of claims 1 to 6 and 8 to 11, wherein the tooth length and the tooth tip width of each tooth belonging to the first dentition are the same. Is.

According to the invention of claim 1, the binding force of the recording material bound by the tooth having a small meshing height is increased as compared with the case where the tooth tip width of this tooth is the same as that of a tooth having a large meshing height. be able to.

According to the inventions of claims 2 and 6, the stress concentration generated in the recording material by the corner portion of the tip portion can be relaxed as compared with the case where the tip portion of the tooth has a rectangular shape.

According to the invention of claim 3, the dentition can be easily processed as compared with the case where the two hypotenuses of each tooth in the first compartment and the two hypotenuses of each tooth in the second compartment do not overlap.

According to the invention of claim 4, when binding a rectangular recording material, the recording is performed as compared with the case where the two hypotenuses of each tooth in the first section and the two hypotenuses of each tooth in the second section overlap each other. If the second side surface is directed to the rectangular corner of the material, the space at the corner can be effectively used.

According to the invention of claim 5, when the second side surface is directed to the corner of the rectangular recording material, the two hypotenuses of each tooth in the first compartment and the two hypotenuses of each tooth in the second compartment overlap. Compared with the case, the space at the corner of the recording material can be effectively used.

According to the invention of claim 7, the space at the corner of the rectangular recording material is increased as compared with the case where the two hypotenuses of each tooth in the first compartment and the two hypotenuses of each tooth in the second compartment overlap each other. It can be used effectively.

According to the invention of claim 8, the drag force against the force for rotating the recording material in the plane of the recording material is larger than that in the case where both the first section and the second section are one.

According to the invention of claim 9, when binding a rectangular recording material, the space at the corner can be effectively used as compared with the case where the second section is located at both ends in the tooth alignment direction.

According to the invention of claim 10, when binding a rectangular recording material, the center of the effective tooth tip in the tooth width direction is the center as compared with the case where the first section and the second section are aligned in the tooth width direction. If the direction of deviation is directed toward the corner of the recording material, the binding position can be moved closer to the corner.

According to the invention of claim 11, if the direction of deviation of the center of the effective tooth tip is directed to the corner of the rectangular recording material, the center of the effective tooth tip in the tooth width direction is the tooth in the first section and the second section. The space at the corners can be used more effectively than when the teeth are aligned in the width direction.

According to the invention of claim 12, the space at the corner of the rectangular recording material is larger than that in the case where the center of the effective tooth tip in the tooth width direction is aligned in the tooth width direction in the first section and the second section. It can be used effectively.

According to the invention of claim 13, the processing of the first dentition is easier than in the case where the tooth length and the tooth tip width of each tooth belonging to the first dentition are not the same.

It is a schematic diagram which shows the schematic structure of the image formation system. It is a perspective view which shows the upper dentition and the lower dentition of the recording material binding apparatus of this embodiment. It is sectional drawing which shows the state in which the upper dentition and the lower dentition are meshed with each other. It is a figure which shows the shape seen from the tooth arrangement direction of the lower high tooth and the lower low tooth. It is a figure which shows the relationship between the upper tooth, the lower high tooth, and the lower low tooth. It is a figure which shows another example of the shape of the lower high tooth and the lower low tooth. It is a figure which shows still another example of the shape of the lower high tooth and the lower low tooth. It is a figure which shows still another example of the shape of the lower high tooth and the lower low tooth. It is a figure which shows still another example of the shape of the lower high tooth and the lower low tooth. It is a figure which shows the binding recording material. It is a figure which shows the recording area and the margin area of a recording material. It is an enlarged view of the corner part of the bound recording material. It is an enlarged view of the corner part of the bound recording material.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a schematic configuration of an image forming system 12 including the recording material binding device 10 of the present embodiment. The image forming system 12 includes, for example, an image forming apparatus 14 having a printing function and a copying function by an electrophotographic method, and a recording material after the image is formed by the image forming apparatus 14, for example, after drilling or binding. The recording material post-processing apparatus 16 for processing is provided. The recording material binding device 10 of the present embodiment can be mounted on the recording material post-processing device 16.

The image forming apparatus 14 has an image forming unit 18 that forms a toner image based on the acquired document information. The document information may be acquired by reading the document by the document reading unit 20 provided in the image forming apparatus 14, or may be acquired from an external device. The image forming apparatus 14 further includes a recording material feeding mechanism 22. The recording material to be sent is a sheet-shaped recording material cut into a rectangle, and the material is, for example, paper. The recording material feeding mechanism 22 includes a supply tray 24 for holding the stacked recording materials, and a transport path 28 for feeding the recording materials from the supply tray 24 to the discharge port 26. In the process of being fed through the transport path 28, the recording material receives the toner image formed by the image forming unit 18, and the toner image is fixed. The recording material sent out from the discharge port 26 is received by the recording material aftertreatment device 16.

In the recording material aftertreatment device 16, the received recording material is laminated on the accumulation tray 30 as needed to form a recording material bundle. If accumulation is not required, the recording material is delivered to the discharge tray 32. When a predetermined number of recording materials are accumulated on the accumulation tray 30, the recording material is bound by the recording material binding device 10. The recording material binding device 10 has two dentitions 34 and 36, each of which is a pair in which a plurality of teeth are arranged. In order to distinguish between the two dentitions, for convenience, the dentition located on the upper side is referred to as the upper dentition 34 and the dentition located on the lower side is referred to as the lower dentition 36 in FIG. The two dentitions 34 and 36 may be arranged so as to face each other with the recording material to be bound sandwiched between them, and may be arranged on the left and right sides, and the lower dentition 36 may be arranged with the upper dentition 34 down. May be placed on top.

One or both of the upper dentition 34 and the lower dentition 36 advance and retreat toward the other dentition by the drive mechanism, and when they advance, the dentitions mesh with each other. When the dentitions mesh with each other, the sandwiched recording material is deformed into a corrugated shape, and the recording materials are bonded to each other and bound. After binding, the recording material bundle is sent out to the discharge tray 32.

FIG. 2 is a perspective view showing the upper dentition 34 and the lower dentition 36. As shown in FIG. 2, the direction in which the teeth are lined up is defined as the "tooth alignment direction", the tooth height direction is defined as the "tooth height direction", and the direction orthogonal to the tooth alignment direction and the tooth height direction is defined as the "tooth width direction". This will be described below. Further, FIG. 3 is a view showing a cross section orthogonal to the tooth width direction in a state where the upper dentition 34 and the lower dentition 36 are meshed with each other.

As shown in FIG. 2A, the upper dentition 34 includes six upper teeth 38 having the same tooth length hu and tip width w. As shown in FIG. 2B, the lower dentition 36 has seven lower teeth 40, 42, more specifically four lower high teeth 40 and three lower teeth. It has low teeth 42. The upper teeth 38, the lower high teeth 40, and the lower low teeth 42 have a substantially isosceles trapezoidal shape when viewed in the tooth alignment direction. The tooth height hd2 of the lower low tooth 42 is smaller than the tooth height hd1 of the lower high tooth 40, and the tooth tip width wd2 of the lower low tooth 42 is larger than the tooth tip width wd1 of the lower high tooth 40. The tooth length hu of the upper tooth 38 is equal to the tooth height hd1 of the lower high tooth 40, and the tooth tip width ww is equal to or less than the tooth tip width wd1 of the lower high tooth 40. As shown in FIG. 3, the bottoms of the tooth grooves between the upper teeth 38 in the upper dentition 34 are at the same position in the tooth height direction. Similarly, in the lower dentition 36, the bottom of the tooth groove is in the same position. Two lower high teeth 40 are arranged on both sides of the three lower low teeth 42. The section in which the lower high teeth 40 are arranged is referred to as a high tooth section 44, and the section in which the lower low teeth 42 are arranged is referred to as a low tooth section 46.

FIG. 4 is a diagram showing a state in which the lower high teeth 40 and the lower low teeth 42 are viewed from the tooth alignment direction. The corners formed by the tooth tip 40t and the tooth side surface 40f of the lower high tooth 40 are rounded, and the tooth tip width wd1 is defined as the length of the tooth tip 40t without the round chamfer. That is, the left and right tooth side surfaces 40f and the tooth tip 40t are extended respectively, and the distance in the tooth width direction of each intersection is defined as the tooth tip width wd1. Similarly, the lower low tooth 42 also extends the left and right tooth side surfaces 42f and the tooth tip 42t, respectively, and the distance in the tooth width direction of each intersection is defined as the tooth tip width wd2. The center positions of the lower high tooth tip 40t and the lower low tooth tip 42t in the tooth width direction are the same. As shown in FIG. 4, the tooth tip 42t of the lower low tooth extends to the outside of each of the left and right tooth side surfaces 40f of the lower high tooth. As shown in FIG. 4, the tooth side surface 40f of the lower high tooth is inclined at an inclination angle θ1 with respect to the tooth height direction, and the tooth side surface 42f of the lower low tooth is inclined with respect to the tooth height direction θ2. Is leaning. These inclination angles θ1 and θ2 are equal in the recording material binding device 10.

FIG. 5 is a diagram showing the upper teeth 38 and the lower high teeth 40 and the lower low teeth 42 viewed from the tooth alignment direction in an overlapping manner. The tips of the upper teeth 38t and the tips of the lower high teeth 40t are aligned in the tooth width direction. The inclination of the tooth side surface 38f of the upper tooth is equal to the inclination of the tooth side surface 40f of the lower high tooth. The tooth tip 40t of the lower high tooth and the tooth tip 42t of the lower low tooth are contained within the tooth surface 38p of the upper tooth 38. That is, the tooth tips 40t and 42t are housed inside the left and right tooth side surfaces 38f of the upper tooth 38. In such a case, the entire tooth tip widths wd1 and wd2 contribute to the bonding of the recording material. That is, when the upper dentition 34 and the lower dentition 36 mesh with each other, the tooth tips 40t and 42t pull the recording material between the upper teeth 38 and press it against the tooth surface 38p of the upper tooth. As a result, the recording materials are bonded to each other. Therefore, in the lower high tooth 40, the tooth tip length wde1 that contributes to the bonding of the recording material coincides with the tooth tip width wd1. Further, also in the lower low tooth 42, the tooth tip length wde2 that contributes to the bonding of the recording material coincides with the tooth tip width wd2.

On the other hand, when the tooth tip 42t'protrudes from the tooth surface 38p of the upper tooth as in the lower low tooth 42'shown by the alternate long and short dash line in FIG. 5, the protruding portion does not contribute to the bonding of the recording material. .. Therefore, the tooth tip length wde2 that contributes to the bonding of the recording material in this case is smaller than the tooth tip width wd2'.

The tooth tip 38t of the upper tooth 38 is also contained within the tooth surfaces 40p and 42p of the lower high tooth and the lower low tooth, and the length wue of the tooth tip that contributes to the bonding of the recording material is the tooth tip width wu. Match.

In the upper teeth 38 and the lower teeth 40 and 42 that mesh with each other, the length of the tooth tip that greatly affects the bonding force of the recording material is the length of the longer tooth tip. Of the lengths of the tooth tips that contribute to the bonding of the recording materials of the meshing teeth, the longer one is referred to as "effective tooth tip" and the length is referred to as "effective tooth tip width we". That is, in the high tooth section 44, the tooth tip length wde1 that contributes to the bonding of the recording material of the lower high tooth 40 is equal to or greater than the tooth tip length wue that contributes to the bonding of the recording material of the upper tooth 38. , Let this be the high tooth section effective tooth tip width we1. In the low tooth section 46, the tooth tip length wde2 that contributes to the bonding of the recording material is defined as the low tooth section effective tooth tip width we2. As described above, when the tooth tip extends outward from the tooth side surface of the other tooth, the effective tooth tip width is determined by the range within the tooth surface of the other tooth.

In addition to the above-mentioned dimensions in the tooth width direction, the bonding force between the recording materials also contributes to the dimensions in the tooth height direction. The overlapping dimension of the meshing teeth in the tooth height direction is defined as the meshing height he. The high tooth section meshing height he1, which is the meshing height of the high tooth section 44, is the distance between the tooth tip 38t of the upper tooth and the tooth tip 40t of the lower high tooth when meshing. Further, the low tooth section meshing height he2 is the distance between the tooth tip 38t of the upper tooth and the tooth tip 42t of the lower low tooth when meshed.

The dentitions 34 and 36 of the recording material binding device 10 have a high tooth section 44 and a low tooth section 46. The high tooth section 44 corresponds to a thick recording material bundle, and the low tooth section 46 corresponds to a thin recording material bundle. The thickness of the recording material bundle is determined by the number of recording materials constituting the bundle and the thickness of one recording material. For example, if the thickness of one recording material is equal, the larger the number of recording materials, the thicker the recording material bundle, and if the number of recording materials constituting the bundle is the same, the thicker the recording material, the thicker the recording material. The bundle gets thicker.

When the recording material bundle is thin, the recording material is mainly bonded by the low tooth section 46. The recording material is pulled in between the teeth (tooth grooves) of the upper teeth 38 on the mating side where the tooth tips 42t of the lower low teeth 42 mesh with each other, and at this time, the recording materials are bonded to each other and bound. In the high tooth section 44, since the lower high tooth 40 has a large tooth height, the recording material may be significantly deformed and torn. If it is torn, the bond at that portion cannot be expected, and in the case of a thin recording material bundle, the bond is mainly formed by the low tooth section 46. On the other hand, when the recording material bundle is thicker, the recording material is not sufficiently drawn into the tooth groove of the other party in the low tooth section 46, and the bonding force between the recording materials is insufficient. In the high tooth section 44, the tooth tip 40t of the lower high tooth 40 pulls the recording paper deeper into the tooth groove of the upper tooth 38, thereby increasing the coupling force.

The bonding force of the recording material is greater when the meshing height he is larger and when the effective tooth tip width we is larger. When the effective tooth tip width we of the high tooth section 44 and the low tooth section 46 is the same, the meshing height he of the low tooth section 46 is small, so that the binding force becomes small when binding a thin recording material bundle. In this recording material binding device 10, the low tooth section effective tooth tip width we2 is made larger than the high tooth section effective tooth tip width we1 in order to increase the coupling force in the low tooth section 46. As shown in FIG. 4, the tooth tip 42t of the lower low tooth extends outward beyond the tooth side surface 40f of the lower high tooth, and considering that the lower high tooth 40 is an isosceles trapezoid. , Low tooth section effective tooth tip width we2 is larger than high tooth section effective tooth tip width we1.

6-9 are views showing another example of the tooth tip width of the lower low tooth and the position of the tooth tip in the tooth width direction. The lower high tooth 40 and the upper tooth 38 have the same configuration as the above-mentioned example, and the tooth tip width and the position of the tooth tip of the lower low tooth 142, 242, 342, 442 are the same as those of the above-mentioned lower low tooth 42. It's different. Further, these lower low teeth also have an isosceles trapezoidal shape when viewed from the tooth alignment direction. In each example, the tooth length hd1 of the lower high tooth is larger than the tooth height hd2 of the lower low tooth, and the tooth tip width wd1 of the lower high tooth is larger than the tooth tip width wd2 of the lower low tooth. small. The lower high tooth tip 40t and the lower low tooth tip 142t, 242t, 342t, 442t fit within the tooth surface 38p of the upper tooth, and the tooth tip width ww of the upper tooth 38 is the tooth of the lower high tooth 40. If the tip width wd1 or less, the effective tooth tip width we2 of the low tooth section 46 is larger than the effective tooth tip width we1 of the high tooth section 44. In addition to the above specifications, that is, the lower high tooth tip 40t and the lower low tooth tip 142t, 242t, 342t, 442t fit within the tooth surface 38p of the upper tooth, and the tooth tip width of the upper tooth 38. Even if w is a specification other than the specification that the tooth tip width wd1 of the lower high tooth 40 or less, the effective tooth width we2 of the low tooth section 46 is larger than the effective tooth width we1 of the high tooth section 44. The original exists.

In the example shown in FIG. 6, the left end of the lower low tooth tip 142t is located inside the left tooth side surface 40f1 of the lower high tooth 40, while the right end of the tooth tip 142t is lower. It is located on the outer side beyond the tooth side surface 40f2 on the right side of the lateral high tooth 40. In this case, the center positions of the lower high tooth tip 40t and the lower low tooth tip 142t are deviated in the tooth width direction. In FIG. 7, both ends of the tooth tip 242t of the lower low tooth are located inside the tooth side surfaces 40f1 and 40f2 on both sides of the lower high tooth 40. In FIG. 7, the center positions of the lower high tooth tip 40t and the lower low tooth tip 242t are the same in the tooth width direction, but the center positions may be deviated.

In FIG. 8, the left tooth side surface 40f1 of the lower high tooth overlaps the left tooth side surface 342f1 of the lower low tooth, and the right tooth side surface 40f2 of the lower high tooth overlaps the right tooth side surface 42f2 of the lower low tooth. Overlaps on. In FIG. 9, the left tooth side surface 40f1 of the lower high tooth overlaps the left tooth side surface 442f1 of the lower low tooth, while the right tooth side surface 40f2 of the lower high tooth overlaps the right tooth side surface of the lower low tooth. It does not overlap with 442f2, and the right end of the tooth tip 442t of the lower low tooth is located outside beyond the tooth side surface 40f2 of the lower high tooth. In this case, the center positions of the lower high tooth tip 40t and the lower low tooth tip 442t are deviated in the tooth width direction. Further, the right end of the tooth tip 442t of the lower low tooth may be located inside the tooth side surface 40f2 of the lower high tooth. In this case as well, the center positions of the lower high tooth tip 40t and the lower low tooth tip 442t are out of alignment. When the tooth side surface of the lower high tooth and the tooth side surface of the lower low tooth overlap as in the cases of FIGS. 8 and 9, the tooth side surface on the same side can be processed at one time.

FIG. 10 is a diagram showing a recording material 48 and a bonding region 50 in which the recording materials 48 are bonded to each other by the recording material binding device 10. A coupling region 50 is formed by sandwiching a plurality of recording materials 48 stacked between the upper dentition 34 and the lower dentition 36 and deforming them into a wavy shape. The region deformed by the high tooth section 44 of the dentitions 34 and 36 has a large wave height when deformed into a wave shape, and this region is referred to as a high wave region 52. Further, the wave height is lowered in the region deformed by the low tooth section 46, and this region is referred to as a low wave region 54. The coupling region 50 is formed corresponding to the effective tooth tip, the width of the high wave region 52 corresponds to the effective tooth tip width we1 of the high tooth section, and the width of the low wave region 54 corresponds to the effective tooth tip width we2 of the low tooth section. To do. Similar to the arrangement of the low tooth section 46 and the high tooth section 44, the two high wave regions 52 are located so as to sandwich the low wave region 54. Since the two high wave regions 52 are separated from each other, the force against the force M that tends to rotate the recording materials 48 relative to each other in the paper surface becomes large with respect to the thick recording material bundle.

FIG. 11 is a diagram showing the relationship between the recording material 48 and the recording area 56. When the content of the original is recorded on the recording material 48 by printing or the like, a margin is provided around the recording material 48 for recording. The range where recording is expected is referred to as a recording area 56, and the area outside the recording area 56 where recording is not performed is referred to as a margin area 58. When the rectangular recording material 48 is bound at one place, it is bound at the rectangular corner 60, for example, the upper left corner in consideration of the ease of turning the recording material. The corner portion 60 is sandwiched between the upper dentition 34 and the lower dentition 36, and a coupling region 50 is formed in the corner portion 60.

12 and 13 are enlarged views of the corner 60 of the recording material 48 bound by the corner 60 and its surroundings. In FIG. 12, the recording material 48 is bound using the lower dentition 36 in which the centers of the effective tooth tips of the lower high teeth 40 and the lower low teeth 42 are aligned in the tooth width direction, and the upper dentition 34. The coupling region 50 at the time is shown. The center line C of the high wave region 52 and the low wave region 54 coincides with the center line connecting the centers of the effective tooth tips of the high tooth section 44 and the low tooth section 46, and intersects the upper side and the left side of the recording material 48. .. The crossing angle is, for example, 45 ° ± 5 °. By using the lower dentition 36 in which the low tooth section 46 having a long effective tooth width is sandwiched between the high tooth sections 44, the connecting region 50 in which the wide low wave region 54 is sandwiched between the narrow high wave regions 52 is formed. It is formed. The arrangement of the low wave region 54 and the high wave region 52 makes it easier to bring the coupling region 50 closer to the corner of the recording material 48 than the reverse arrangement, that is, the arrangement in which the high wave region 52 is sandwiched between the low wave regions 54, and from the recording region 56. It becomes easier to separate.

In order to form the coupling region 50 on the recording material 48 in this way, the arrangement of the recording material binding device 10 with respect to the accumulation tray 30 is such that the corners of the recording material 48 with respect to the recording material 48 accumulated in the accumulation tray 30. The center line facing the portion 60 and connecting the centers of the effective tooth tips of the high tooth section 44 and the low tooth section 46 is arranged so as to intersect the sides of the recording material 48.

In FIG. 13, the recording material 48 is bound using the lower dentition 36 in which the centers of the effective tooth tips of the lower high teeth 40 and the lower low teeth 42 are displaced in the tooth width direction, and the upper dentition 34. The coupling region 50 at the time is shown. The center line C1 of the high wave region 52 coincides with the center line connecting the centers of the effective tooth tips of the high tooth section 44, and the center line C2 of the low wave region 54 is the center connecting the centers of the effective tooth tips of the low tooth section 46. Match the line. The center line C2 of the low wave region 54 is deviated to the angle 62 side with respect to the center line C1 of the high wave region 52. Further, the center lines C1 and C2 intersect the upper side and the left side of the recording material 48. The crossing angle is, for example, 45 ° ± 5 °. Due to the deviation of the center lines C1 and C2, the portion of the recording material 48 closer to the corner 62 is connected to the recording material 48 as compared with the case where the center lines of the high wave region 52 and the low wave region 54 are aligned. It will be easier to use. Further, the bonding region 50 can be easily brought close to the corner of the recording material 48, and can be easily separated from the recording region 56.

In order to form the coupling region 50 on the recording material 48 in this way, the arrangement of the recording material binding device 10 with respect to the accumulation tray 30 is such that the corners of the recording material 48 with respect to the recording material 48 accumulated on the accumulation tray 30. The center line facing the portion 60 and connecting the centers of the effective tooth tips of each tooth in the high tooth section 44 and the center line connecting the centers of the effective tooth tips of each tooth in the low tooth section 46 intersect the sides of the recording material 48. Further, the deviation of the center line of the effective tooth tip of the low tooth section 46 with respect to the center line of the effective tooth tip of the high tooth section 44 is arranged toward the angle 62.

The meshing height of the high tooth section and the low tooth section can be set by the tooth heights of both the upper tooth and the lower tooth. For example, the meshing height of the upper tooth is set by adopting a tooth profile having a low tooth height and a wide tooth tip width as shown in FIG. 4 in the low tooth section. In this case, if the same meshing height is set, the tooth height of the lower teeth is larger than that when the meshing height is set only by the lower teeth. Both the upper and lower dentitions may have the two hypotenuses of the low teeth located outside the two hypotenuses of the high teeth as shown in FIG. 4, and the low and high teeth as shown in FIG. The two hypotenuses of the tooth may overlap each other. Further, one dentition may have two hypotenuses of low teeth located outside the two hypotenuses of high teeth, and the other dentition may have two hypotenuses overlapping.

The combination of two high-tooth sections and one low-tooth section is not limited, and a larger number of sections may be provided. The inclination of the tooth side surfaces of the lower high teeth 40 and the lower low teeth 42, that is, the inclination angles θ1 and θ2 of the hypotenuse of the isosceles trapezoid is, for example, 60 ° or more. When it is 60 ° or more, tearing of the recording material due to the corners at both ends of the tooth tip is suppressed. Further, the inclination angles θ1 and θ2 of the hypotenuses of the lower high teeth 40 and the lower low teeth 42 may be different. The inclination angles of the two hypotenuses of the upper teeth 38 may be the same as or different from the inclination angles of one of the lower high teeth 40 and the lower low teeth 42. Good. The shape of each tooth when viewed from the tooth alignment direction is not limited to an isosceles trapezoid, but may be a general trapezoid, a rectangle, a trapezoid on the tip side and a rectangle on the tooth root side.

10 Recording material binding device, 12 Image forming system, 14 Image forming device, 16 Recording material after-processing device, 18 Image forming unit, 20 Document reading unit, 22 Recording material feeding mechanism, 24 Supply tray, 26 Discharge port, 28 Transport path , 30 Accumulation tray, 32 Discharge tray, 34 Upper dentition, 36 Lower dentition, 38 Upper tooth, 38t Upper tooth tip, 38f Upper tooth side, 38p Upper tooth surface, 40 Lower high tooth (Lower tooth), 40t lower high tooth tip, 40f lower high tooth tooth side, 40p lower high tooth tooth surface, 42 lower low tooth (lower tooth), 42t lower low tooth Tooth tip, 42f lower low tooth side, 42p lower low tooth surface, 44 high tooth section, 46 low tooth section, 48 recording material, 50 coupling area, 52 high wave region, 54 low wave region, 56 recording Area, 58 margin area, 60 squares, 62 squares, hu upper tooth length, hd1 lower high tooth length, hd2 lower low tooth length, wu upper tooth tip width, wd1 lower tooth height Tooth tip width, wd2 lower low tooth tip width, wde1 lower high tooth tip length that contributes to the connection of recording material, wde2 lower low tooth tip that contributes to the connection of recording material Length, we effective tooth tip width, we1 high tooth section effective tooth tip width, we2 low tooth section effective tooth tip width, he meshing height, he1 high tooth section meshing height, he2 low tooth section meshing height.

Claims (13)

The first dentition consisting of multiple teeth arranged in the tooth alignment direction,
The second dentition, which consists of a plurality of teeth and meshes with the first dentition, sandwiches a bundle of recording materials in cooperation with the first dentition and binds the recording material.
Including
In the tooth alignment direction, in the first dentition and the second dentition, the meshing height of the teeth belonging to the first dentition and the teeth belonging to the second dentition is the first meshing height, and the width of the effective tooth tip is The first section, which is the width of the first effective tooth tip, and the second effective tooth tip, whose meshing height is smaller than the first meshing height and whose width of the effective tooth tip is larger than the width of the first effective tooth tip. Has a second section of width,
Recording material binding device. The recording material binding device according to claim 1, wherein at least the tip portion of each tooth has a trapezoidal shape that extends from the tooth tip toward the tooth root side when viewed from the tooth alignment direction. In at least one of the first dentition and the second dentition, the tooth length and tip width of the tooth in the first section and the tooth in the second section are different, and the two oblique sides of the trapezoidal shape of each tooth belonging to the second section. The recording material binding device according to claim 2, wherein each of the two diagonal sides of the trapezoidal shape of each tooth belonging to the first section overlaps when viewed from the tooth alignment direction. The first section is arranged at both ends in the tooth alignment direction,
Regarding the first side surface, which is the same side surface of the first dentition and the second dentition, in each of the first dentition and the second dentition, when viewed from the tooth alignment direction, each tooth belonging to the second section One oblique side of the trapezoidal shape overlaps one oblique side of the trapezoidal shape of each tooth belonging to the first section.
Regarding the first dentition and the second side surface opposite to the first side surface of the second dentition, at least one of the first dentition and the second dentition belongs to the second section when viewed from the tooth alignment direction. The other oblique side of the tooth trapezoidal shape is located outside the other oblique side of the tooth trapezoidal shape belonging to the first section.
The recording material binding device according to claim 2. The recording material to be bound is rectangular, the tooth alignment directions of the first and second dentitions are along the direction intersecting the sides of the recording material, and the second side surface of the first and second dentitions is recorded. The recording material binding device according to claim 4, wherein the corners of the recording material bundle are sandwiched in a posture facing the corners of the material. The recording material binding device according to any one of claims 2 to 5, wherein the angle of the hypotenuse of the trapezoidal shape of each tooth is 60 ° or more with respect to the height direction. A recording material accumulation part in which a plurality of rectangular recording materials are accumulated to form a recording material bundle,
The first dentition and the second dentition face the corners of the recording material bundle, and the tooth alignment directions of the first and second dentitions are along the direction intersecting the sides of the recording material bundle. The recording material binding device according to claim 4, which is arranged with respect to the recording material accumulating portion so that the second side surfaces of the first dentition and the second dentition face the corners of the recording material bundle.
Recording material aftertreatment device having. The recording material binding device according to any one of claims 1 to 3, which has at least one of a first section and a second section, and the first section and the second section are alternately arranged. The recording material binding device according to claim 6, wherein first sections are arranged at both ends in the tooth alignment direction. The recording material binding device according to claim 9, wherein the center of each effective tooth tip in the tooth width direction is deviated in the tooth width direction between the first section and the second section. The recording material to be bound is rectangular, the tooth alignment direction of the first and second dentitions is along the direction intersecting the sides of the recording material, and the second with respect to the center of the effective tooth tip of the tooth belonging to the first section. The recording material binding device according to claim 10, wherein the corner of the recording material bundle is sandwiched in a posture in which the deviation direction of the center of the effective tooth tip of the tooth belonging to the section faces the corner of the recording material. A recording material accumulation part in which a plurality of rectangular recording materials are accumulated to form a recording material bundle,
The first dentition and the second dentition face the corners of the recording material bundle, and the tooth alignment directions of the first dentition and the second dentition are along the direction intersecting the sides of the recording material bundle. In addition, the center of the effective tooth tip of the tooth belonging to the second section is deviated from the center of the effective tooth tip of the tooth belonging to the first section toward the corner of the recording material bundle with respect to the recording material accumulating portion. The recording material binding device according to claim 10, which is arranged in the same manner.
Recording material aftertreatment device having. The recording material binding device according to any one of claims 1 to 6 and 8 to 11, wherein the tooth length and the tooth tip width of each tooth belonging to the first dentition are the same.

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