JP6664290B2 - Desk calendar and its holder - Google Patents

Description

  The present invention relates to a desk calendar and its holder.

  Conventionally, various desk calendars have been used. One example is a holder comprising a rectangular back plate, two side plates connected to two opposite sides of the back plate, two table holding plates connected to the two side plates, a back plate and a table holding plate. It is a desk calendar consisting of a plurality of calendar pieces arranged between boards. The space between the back plate and the front holding plate is a calender piece receiving portion.

  The back plate often has support legs for holding the holder in a leaning state. Further, the side plate and the table holding plate are attached to the upper and lower sides of the back plate in a pair, or are attached to the right and left sides of the back plate in a pair. This holder is usually made of a plastic sheet.

  The holder needs to have a certain strength against bending and twisting in order to hold a calender piece of paper material. In order to maintain this strength, the conventional holder had to use a plastic sheet having a certain thickness.

  A holder made of a thick plastic sheet increases the material cost and the transportation cost.

  In addition, the conventional holder has insufficient fixing of the paper material calendar piece. That is, the holder fixes the calendar piece by sandwiching the calendar piece between the back plate and the front holding plate that constitute the calendar piece housing portion, but the holding force is not sufficient. Therefore, when the holder was tilted in the direction without the holding plate, the calendar piece slipped or slipped off from the calendar piece housing portion.

  With respect to the improvement of the fixing force of the calendar piece, a proposal has been made in which a pressing piece having a projection projecting into the frame is formed on the back plate of the holder by notch (for example, Patent Document 1). However, the holder according to the proposal requires time and effort to erect the holding piece, and it is unclear to what extent it should be erect (an angle of 90 degrees, 60 degrees or 30 degrees).

  Furthermore, in order to maintain the standing state of the holding piece constant, it is necessary to use a thick plastic sheet, and there is a dilemma that the use of the above-mentioned thick plastic sheet causes other problems. is not.

JP-A-10-329449

  An object of the present invention is to provide a calender holder having sufficient strength to hold calender pieces even when the thickness of a plastic sheet as a material is reduced. Still another object of the present invention is to provide a calendar holder in which the pinch holding force of the calendar piece is maintained even when the thickness of the plastic sheet as the material is reduced, and the adjustment of the pinch strength is unnecessary. .

  Another object of the present invention is to provide a desk calendar including a calendar holder and a calendar piece having sufficient strength to hold a calendar piece even when the thickness of a plastic sheet as a material is reduced.

  The present invention also provides a desk calendar comprising a calendar holder and a calendar piece, in which the pinch holding force of the calendar piece is maintained even when the thickness of the plastic sheet as the material is reduced, and the adjustment of the pinch holding strength is unnecessary. The task is to obtain

  Other objects of the present invention will become apparent from the description of the present invention.

  The means for solving the problem will be described below. For ease of understanding, description will be made with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited to the embodiments. In addition, numerals that are signs may indicate parts and the like collectively.

The holder according to one embodiment of the present invention includes:
A rectangular back plate (10), two side plates (31, 32) connected to two opposing sides (35, 36) of the back plate, and two tables connected to the two side plates, respectively; Holding plate (41, 42), a calendar piece receiving portion (63) for inserting a calendar piece sandwiched between the back plate and the 2 front holding plate,
The back plate has a crease (11-16), the crease is to valley-fold the back surface of the back plate, the crease is a straight line, and the length of the crease is OL, Assuming that the length of an imaginary extension line extending from both ends of the crease and extending to a point where the fold line intersects the side of the back plate is KL, Expression (1) is established.
1 / 2KL ≦ OL ≦ KL Equation (1)

A holder according to another aspect of the present invention,
It has a supporting leg (50) and a rectangular back plate (10), an upper plate (31) and a lower plate (32) connected to upper and lower sides of the back plate, respectively, and connected to the upper plate. An upper table holding plate (41) and a lower table holding plate (42) connected to the lower plate, and a calendar piece for inserting a calendar piece inserted between the back plate and the upper table holding plate and the lower table holding plate. With a storage section (63),
The back plate has a crease (11-16), the crease is to valley-fold the back surface of the back plate, the crease is a straight line, and the length of the crease is OL, Assuming that the length of an imaginary extension line extending from both ends of the crease and extending to a point where the fold line intersects the side of the back plate is KL, Expression (1) is established.
1 / 2KL ≦ OL ≦ KL Equation (1)

The holder according to the preferred embodiment of the present invention comprises:
The folding line comprises a right folding line (12) and a left folding line (13), which are two folding lines, and the right folding line and the left folding line are respectively an upper side and a lower side of the back plate. Is a straight line connecting
The right external fold is positioned within a distance of 10 mm from the right side (37) of the back plate and parallel to the right side, and the left external fold is within a distance of 10 mm from the left side (38) of the back plate and parallel to the left side. 3 is a holder according to the present invention,

A holder according to another preferred embodiment of the present invention comprises:
The folding line further includes a right internal folding line (14) and a left internal folding line (15), which are the two folding lines, and the right internal folding line and the left internal folding line define an upper side and a lower side of the back plate. It is a straight line that connects
The right internal fold is located within a distance of 10 mm to the left of the right external fold of the back plate and parallel to the right side, and the left internal fold is within a distance of 10 mm to the right of the left external fold of the back plate and The holder described above, which is positioned parallel to the left side.

A desk calendar according to another embodiment of the present invention includes:
Either holder according to the present invention and a calendar piece are provided.

  The present invention described above, the preferred embodiments of the present invention, and the components included therein can be implemented in combination as much as possible.

  Since the holder according to the present invention has a crease of a fixed length on the back plate, it interacts with other invention specific items, and the strength of holding the calendar piece against bending, twisting, etc. is improved. There are advantages. In addition, since the back plate is made to have a slight valley-folded shape due to the folding line, an appropriate pinching holding force is applied to the calender piece housing portion. The valley fold shape does not need to be formed by human power or the like, and is formed by forming a fold line. Further, the improvement of the holding strength and the provision of the holding force can be realized without increasing the thickness of the material.

  In the desk calendar according to the present invention, since the back plate of the holder constituting the desk calendar is provided with a crease of a fixed length, it interacts with the other specified matters of the invention to prevent bending and twisting of the calendar piece. There is an advantage that the strength of holding the table is improved, and the desk calendar has a stable feeling. In addition, since the back plate is hammered into a slight valley fold shape due to the folding line, the calender pieces accommodated in the calender piece accommodating portion are pushed from the back plate and pressed against the front holding plate. Therefore, the holding force of the calendar piece is improved. The valley fold shape does not need to be formed by human power or the like, and is formed by forming a fold line. Therefore, even when an unexpected force is applied, the calendar piece does not come off or fall out of the calendar piece housing portion. Further, the improvement of the holding strength and the provision of the holding force can be realized without increasing the thickness of the material.

FIG. 1 is a front view of the calendar holder according to the first embodiment. FIG. 2 is a plan view of the holder before folding. FIG. 3 is an explanatory cross-sectional view of the holder base material for explaining formation of the folding line and the folding line. FIG. 4 is a plan view of a calender holder before folding according to the second embodiment. FIG. 5 is a front view of the desk calendar according to the first embodiment. FIG. 6 is a side view of the desk calendar according to the first embodiment.

  Hereinafter, a desk calendar and a holder according to an embodiment of the present invention will be further described with reference to the drawings. Some of the drawings referred to in this specification are schematically illustrated, for example, by exaggerating some components in order to facilitate understanding of the present invention. For this reason, dimensions, ratios, and the like between the components may be different from the actual ones. Further, the dimensions, materials, shapes, relative positions, and the like of the members and portions described in the embodiments of the present invention are not intended to limit the scope of the present invention only to them unless otherwise specified. Rather, they are merely illustrative examples.

  FIG. 1 is a front view showing an example of the holder according to the first embodiment. In the front view, the upper table holding plate 41 and the lower table holding plate 42 overlap on the back plate 10, but members below the upper table holding plate 41 and the lower table holding plate 42 are indicated by broken lines. They are shown by solid lines and alternate long and short dash lines without expressing the vertical relationship. The same applies to the front view of FIG.

  FIG. 2 is a plan view of the holder before folding. The plan view corresponds to a development view of the holder. FIG. 5 is a front view of the desk calendar according to the first embodiment. FIG. 6 is a side view of the desk calendar according to the first embodiment, and is a cross-sectional view taken along line AB in FIG.

  The holder 6 has a back plate 10, an upper table holding plate 41 as a table holding plate, and a lower table holding plate 42 as a table holding plate. The back plate 10 has support legs 50.

  The back plate 10 is rectangular and is surrounded by an upper side 35, a lower side 36, a right side 37 and a left side 38. The holder 6 has an upper plate 31 connected to the upper side 35 of the back plate 10 and an upper table holding plate 41 connected to the upper plate 31. The upper plate 31 is a side plate.

  The line sandwiched between the back plate 10 and the upper plate 31 is the upper side and the upper plate fold line 35. In FIGS. 1 to 6, the fold line is shown by a dashed line. The line sandwiched between the upper plate 31 and the upper holding plate 41 is an upper holding plate fold line 45.

  The holder 6 has a lower plate 32 connected to the lower side 36 of the back plate 10 and a lower table holding plate 42 connected to the lower plate 32. The lower plate 32 is a side plate.

  The line sandwiched between the back plate 10 and the lower plate 32 is the lower side and the lower plate fold line 36. The line sandwiched between the lower plate 32 and the lower table holding plate 41 is a lower table holding plate fold line 46.

  The upper plate fold line 35 and the lower plate fold line 36 are fold lines of a valley fold on the surface of the back plate. The surface of the back plate is the upper surface of the paper in FIG. 6, the front side of the back plate 10 is indicated by an arrow 66.

  The upper plate fold line 35 of the holder substrate 7 raises the upper plate 31 at an angle of approximately 90 degrees, and the upper table holding plate fold line 45 raises the upper table holding plate 41 at an angle of approximately 90 degrees. The lower plate fold line 36 raises the lower plate 32 at an angle of approximately 90 degrees, and the lower table holding plate fold line 46 raises the lower table holding plate 42 at an angle of approximately 90 degrees.

  In this manner, the holder 6 having the calender piece housing portion 63 which is a flat rectangular parallelepiped space is formed. The calendar piece accommodating portion 63 is surrounded by the back plate 10, the upper plate 31, the lower plate 32, the upper table holding plate 41, and the lower table holding plate. There are no side plates on the right side 37 and left side 38, and these are the entrances for the calendar pieces.

  The back plate 10 has support legs 50. In the embodiment shown in FIGS. 1 and 2, a cut line and a fold line are provided in the holder base material 7 to be a member of the support leg 50. The members of the support leg 50 are a leg portion 51 having a locking portion 52 and a support portion 54.

  A leg fold line 53 that is likely to cause the leg 51 and support portion fold lines 55 and 56 that are likely to cause the support portion 54 are valley fold lines when viewed from the back surface of the back plate 10. is there. The back surface of the back plate 10 is the back surface of the paper in FIG. 1 and is the direction indicated by the arrow 67 in FIG.

  The leg 51 is raised at the leg crease line 53. The angle of raising is approximately 140 degrees. In addition, the support portion 54 is caused at the support portion fold lines 55 and 56. The angle of the raising is approximately 40 degrees. The distal end 58 of the support portion is inserted into the locking portion 52 to lock the distal end 58 to the locking portion 52. In this way, the leg portion 51 is fixed in the raised state, and the supporting leg is formed.

  The holder 6 is self-standing with the lower side 36 and the leg grounding side 57 in contact with the desk surface or the like. The specific mode of the support leg is not limited to the mode illustrated and described, but can be appropriately selected from those normally used as legs for standing the desk calendar and the holder. For example, a mode in which the support leg members are separately manufactured and attached to the back plate by means such as adhesion or welding may be employed.

  In the present invention, the “supporting leg” also includes a suspending handle for suspending a desk calendar. The hanging handle may have a hole and may have a hook shape.

  The holder 6 has a right outer fold line 12 as a fold line, a right inner fold line 14 as a fold line, a left outer fold line 13 as a fold line, and a left inner fold line 15 as a fold line. In FIGS. 1 to 6, the creases are indicated by alternate long and short dash lines.

  The right outer fold line 12 and the right inner fold line 14 are straight lines parallel to the right side 37 of the back plate 10 and have the same length as the right side 37. That is, the upper ends of the right outer fold line 12 and the right inner fold line 14 are upper sides and overlap the upper plate fold line 35, and the lower ends of the right outer fold line 12 and the right inner fold line 14 are lower sides and lower. It overlaps with the side plate fold line 36. However, since the process of forming the crease is performed, that the upper end and the lower end overlap with the upper side or the lower side, respectively, means that the upper end and the lower end of the respective upper and lower sides have a maximum distance of 2 mm from the upper side or the lower side. is there.

  The crease is formed by press-fitting a crease forming blade into the holder base material. 3A and 3B are explanatory views of the formation of the fold, FIG. 3A is an explanatory view of press-fitting of the fold forming blade, and FIG. 3B is a cross-sectional view of the fold.

  As shown in FIG. 3A, the crease forming blade 26 is press-fitted into the holder base 7. The folding line 11 thus formed is a groove-shaped concave portion. Depending on the depth gD of the groove, the strength against bending, twisting, and the like, and the angle of deformation to the valley folded state are affected. The preferred value of gD may be determined by trial and error.

  A guide for the depth gD of the groove is の of the thickness hD of the holder base material 7. The trial and error may be started from gD = (１ ／) hD. (1/2) hD is equal to 0.5hD. In this embodiment, a PET (polyethylene terephthalate) resin plate having a thickness (hD) of 0.4 mm was used as a holder base material, and the depth (gD) of the groove was set to 0.2 mm.

  The folding line can be formed at the same time as the formation of the leg fold lines 53 and the support portion fold lines 55 and 56, and in some cases, the cutting of the support leg cut lines. Fold formation does not require a single processing step.

  It is preferable that the distance between the right outer folding line 12 and the right side 37 be in a range of 2 mm or more and 10 mm or less. Similarly, it is preferable that the distance between the left outer folding line 13 and the left side 38 be in a range of 2 mm or more and 10 mm or less. When the thickness is in this range, the strength is improved at the peripheral portion of the back plate 10, and as a result, the strength of the back plate 10 as a whole is improved.

  It is preferable that the distance between the right internal fold line 14 and the right external fold line 12 is in the range of 2 mm or more and 10 mm or less. Similarly, it is preferable that the distance between the left internal fold line 15 and the left external fold line 13 be in the range of 2 mm or more and 10 mm or less. Within this range, the strength improving effect of the two folds, the outer fold and the inner fold, acts additively.

  Further, it is preferable that the direction of the crease is a direction orthogonal to the longitudinal direction of the flat holding plate having a flat rectangular shape. When applied to the present embodiment, the longitudinal direction of the upper table holding plate 41 is horizontal. The longitudinal direction of the lower table holding plate 42 is horizontal. The right external fold line 12, the left external fold line 13, the right internal fold line 14, and the left internal fold line 15 are straight lines extending in the vertical direction. By doing so, the strength is improved by forming the creases in the vertical direction of the back plate 10, and the strength originally possessed by the side plate fold line and the front holding plate fold line in the left and right direction of the back plate 10 is improved. Working, strength is improved up and down and left and right, the holder is stable.

  If a crease is further formed, the holder base material is slightly deformed into a valley fold from the crease. In this way, deformation occurs in a state where the back plate 10 approaches the front holding plate in an area sandwiching the folding line, and the holding force of the calendar piece is improved.

  The folding line may form a groove on the back surface side of the back plate 10, or may form a groove on the front surface side of the back plate 10. It is preferable that the folding line forms a groove on the back surface side of the back plate 10. The back surface of the back plate 10 is the back side of the paper surface in FIG. 1 and is the direction indicated by the arrow 67 in FIG. By doing so, the right outer folding line 12 and the left outer folding line 13 are deformed into a valley fold when viewed from the rear surface, so that the distance between the right side 37 and the left side 38 with the front holding plates (41, 42) is increased. Therefore, it is easy for the right side 37 to insert and remove the calendar piece 61 from the left side 38 to the calendar piece storage portion 63.

  As the material of the holder, for example, a synthetic resin such as PET, polypropylene, hard PVC, or a biodegradable resin such as lactic acid resin can be used.

  Referring to FIGS. 5 and 6, desk calendar 1 includes holder 6 and calendar piece 61. There are a plurality of calendar pieces 61. Print a calendar for each month on only one side of one sheet of paper to make a calendar piece consisting of 12 sheets for one year (or 13 or 14 sheets including December for the previous year and / or January for the following year). Alternatively, calendars of different months can be printed on both sides of a single sheet of paper to make a total of six or seven calendar pieces.

  The calendar piece 61 is placed in the holder 6 to obtain the desk calendar 1. In the holder 6, the calendar piece 61 is accommodated in a calender piece accommodating portion 63 sandwiched between the back plate 10, the upper table holding plate 41, and the lower table holding plate 42.

  The calendar piece positioned on the outermost surface (October in FIG. 5) has most of its surface exposed. The size of the exposed portion is arbitrarily determined, but is usually determined so as to expose a day portion so as to be useful for writing a schedule or an event. Here, the exposed portion is a portion sandwiched between the upper side of the lower table holding plate 42 and the lower side of the upper table holding plate 41. There is no particular limitation on the size of the calendar piece. Practically, the size is set to B7 or more and A5 or less.

  A holder 6 according to a second embodiment will be described. FIG. 4 is a plan view of the holder according to the second embodiment before folding, and the plan view is equivalent to a developed view of the holder. In the second embodiment, the same parts and members as those of the holder according to the first embodiment are denoted by the same reference numerals.

  The holder 6 has an oblique fold line 16 as a fold line on the back plate 10. The oblique fold 16 is not parallel to the upper side 35 of the rectangular back plate 10 and is not parallel to the right side 37. The oblique folding line 16 is a straight line connecting the right end point 17 and the left end point 18.

  The oblique fold line 16 is extended rightward from the right end point 17 to draw a right extension line 19, and a point where the right extension line 19 intersects the right side 37 is defined as a right intersection 21. The oblique folding line 16 is extended leftward from the left end point 18 to draw a left extension line 20, and a point where the left extension line 20 intersects the left side 38 is defined as a left intersection point 22.

The length of the oblique folding line 16 is OL, and the distance between the right intersection 21 and the left intersection 22 is KL. Normally, OL satisfies equation (1).
1 / 2KL ≦ OL ≦ KL Equation (1)
More preferably, OL satisfies equation (2).
2 / 3KL ≦ OL ≦ KL Equation (2)

  The oblique folding line having the length OL in the above range has an effect of improving the strength of the back plate. In addition, such a skewed folding line improves the holding force of the calendar piece in the holder 6.

  It is sufficient that one or more skew folding lines 16 are provided in the single holder 6. Although the maximum number in a single holder 6 is not particularly limited, it is practically 10, more preferably 6, and still more preferably 4, practically.

  The oblique fold line 16 is a general form, and a specific form thereof is a fold line formed parallel to a side of the back plate. Equation (1) also holds for the crease parallel to the side. The length of the crease parallel to the side is usually 以上 or more of the length of the side and is equal to or less than the length of the side, more preferably ２ or more of the length of the side and is equal to or less than the length of the side. It is.

  The method of forming the oblique fold line 16, the formation of the groove on the back surface of the back plate, and the like are the same as those of the right outer fold line and the other fold lines in the first embodiment.

  The holder 6 of the second embodiment illustrated in FIG. 4 includes a right table holding plate 43 and a left table holding plate 44 in addition to the lower side plate 32 and the lower table holding plate 42.

  That is, the right side plate 33 which is a side plate is connected to the right side fold line 37 on the right side of the back plate 10, and the right side plate 33 is sandwiched between the right side plate fold line 47 and the right side plate 33. 43 are connected. The left side plate 34 as a side plate is connected to the left side plate fold line 38 on the left side of the back plate 10, and the left table holding plate 44 as a table holding plate is sandwiched between the left side plate 34 and the left table holding plate fold line 48. It is articulated.

  The calender piece housing portion of the holder 6 is a flat rectangular parallelepiped sandwiched between the back plate 10, the right plate 33 and the right table holding plate 43, the left plate 34 and the left table holding plate 44, and the lower plate 32 and the lower table holding plate 42. It is. The calendar pieces are taken in and out from the upper side surface of the calendar piece storage section.

  One example of the preferred embodiment of the desk calendar according to the present invention described above is as follows.

  In the holder of the desk calendar according to the present invention, the support legs of the back plate, the back plate is cut out along a cutting line, the leg portion having a locking portion, and the support portion where the back plate is cut out along a cutting line. The support leg is configured such that the leg portion is erected from the back plate, the leg portion is erected from the back plate, and the support portion is locked to the locking portion.

  Further, the desk calendar according to the present invention may be implemented in the modes of items (1) to (4) listed below.

(1) A holder including a rectangular back plate, two side plates connected to two opposing sides of the back plate, two front holding plates connected to the two side plates, respectively, and the back plate And a calender piece arranged between the two table holding plates,
The holder is provided with a fold line on the back plate, the fold line is for valley-folding the back surface of the back plate, the fold line is straight, and the length of the fold line is A desk calendar that is a holder that satisfies the formula (1), where OL is the length of a virtual extension line extending from the both ends of the crease and extending to a point intersecting the side of the back plate.
1 / 2KL ≦ OL ≦ KL Equation (1)

(2) a rectangular back plate having supporting legs, an upper plate and a lower plate connected to upper and lower sides of the back plate, an upper table holding plate and the lower plate connected to the upper plate, respectively; A holder comprising a lower table holding plate connected, and a calender piece disposed between the back plate, the upper table holding plate and the lower table holding plate,
The holder is provided with a fold line on the back plate, the fold line is for valley-folding the back surface of the back plate, the fold line is straight, and the length of the fold line is A desk calendar that is a holder that satisfies the formula (1), where OL is the length of a virtual extension line extending from the both ends of the crease and extending to a point intersecting the side of the back plate.
1 / 2KL ≦ OL ≦ KL Equation (1)

(3) The holder comprises a right outer fold line and a left outer fold line, wherein the fold line is two fold lines, and the right outer fold line and the left outer fold line are respectively formed on the upper side of the back plate. It is a straight line connecting the lower side,
A holder in which the right outer folding line is positioned within a distance of 10 mm from the right side of the back plate and parallel to the right side, and the left outer folding line is located within a distance of 10 mm from the left side of the back plate and parallel to the left side. The desk calendar according to (2) above.

(4) The holder further includes a right internal fold line and a left internal fold line that are two of the fold lines, and the right internal fold line and the left internal fold line are straight lines connecting the upper side and the lower side of the back plate. Yes,
The right internal fold is located within 10 mm on the left side of the right external fold of the back plate and parallel to the right side, and the left internal fold is within 10 mm of the right side of the left external fold of the back plate The desk calendar according to the above (3), which is a holder positioned in parallel with the left side.

  Although the embodiments according to the present invention have been described with reference to the drawings, the specific configuration example is not limited to these embodiments, and there are design changes within the scope of the present invention. This is also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Desktop calendar 6 Holder 7 Holder base material 10 Back plate 11 Folding line 12 Right outer folding line which is a folding line 13 Left outer folding line which is a folding line 14 Right inner folding line which is a folding line 15 Left inner folding line which is a folding line Streaks 16 Oblique folds, which are folds 17 Right end point 18 Left end point 19 Right extension line 20 Left extension line 21 Right intersection 22 Left intersection 26 Fold formation streaks 31 Upper plate as side plate 32 Lower plate as side plate 33 With side plate A right side plate 34 A left side plate that is a side plate 35 An upper side and an upper side plate fold line 36 A lower side and a lower side plate fold line 37 A right side and a right side plate fold line 38 A left side and a left side plate fold line 41 Certain upper table holding plate 42 Lower table holding plate as a table holding plate 43 Right table holding plate as a table holding plate 44 Left table holding plate as a table holding plate 45 Upper table holding plate fold line 46 Lower table holding plate fold line 47 Right table holding plate fold line 48 Left table holding Fold Line 50 Support Leg 51 Leg as a Support Leg Component 52 Locking Part 53 Leg Fold Line 54 Support Part as a Support Leg Component 55 Support Fold Line 56 Support Fold Line 57 Leg Grounding Side 58 Tip 61 Calendar piece 63 Calendar piece accommodation part 66 Arrow showing front side of back plate 67 Arrow showing back side of back plate

Claims (5)

A rectangular back plate, two side plates connected to two opposing sides of the back plate, two table holding plates connected to the two side plates, respectively, and the back plate and two table holding plates With a calendar piece storage part for inserting a calendar piece sandwiched between
The back plate has a fold line, the fold line folds the back surface of the back plate valley, the fold line is straight, the length of the fold line is OL, and both ends of the fold line are provided. Where KL is the length of an imaginary extension line that is extended to a point that intersects with the side of the back plate, and a holder that satisfies Expression (1).
1 / 2KL ≦ OL ≦ KL Equation (1) A rectangular back plate having supporting legs, an upper plate and a lower plate connected to the upper side and the lower side of the back plate, respectively, and an upper table holding plate connected to the upper plate and the lower plate connected to the lower plate. A lower table holding plate, comprising a calendar piece receiving portion for inserting a calendar piece sandwiched between the back plate and the upper table holding plate and the lower table holding plate,
The back plate has a fold line, the fold line folds the back surface of the back plate valley, the fold line is straight, the length of the fold line is OL, and both ends of the fold line are provided. Where KL is the length of an imaginary extension line that is extended to a point that intersects with the side of the back plate, and a holder that satisfies Expression (1).
1 / 2KL ≦ OL ≦ KL Equation (1) The folding line comprises a right folding line and a left folding line which are two folding lines, and the right folding line and the left folding line are straight lines connecting the upper side and the lower side of the back plate, respectively.
The right outer folding line is positioned within a distance of 10 mm from the right side of the back plate and parallel to the right side, and the left outer folding line is located within a distance of 10 mm from the left side of the back plate and parallel to the left side, The holder according to claim 2. The folding line further includes a right internal folding line and a left internal folding line, which are the two folding lines, and the right internal folding line and the left internal folding line are straight lines connecting the upper side and the lower side of the back plate,
The right internal fold is located within a distance of 10 mm to the left of the right external fold of the back plate and parallel to the right side, and the left internal fold is within a distance of 10 mm to the right of the left external fold of the back plate and The holder according to claim 3, wherein the holder is positioned parallel to the left side.   A desk calendar comprising the holder according to any one of claims 1 to 4 and a calendar piece.

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