JP3842173B2 - punch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a punch for punching holes in a large number of papers, and more particularly to a punch that has a simple structure and is intended to reduce the punching operation force.
[0002]
[Prior art]
Conventionally, in order to bind a document, a punch for making two holes or multiple holes along the binding side edge is known. For example, a punch for punching two holes in a document has a pair of punching shafts attached to the mounting position of the operation handle that is rotatably attached to the base end of the operation handle. When rotated from the position, the punching shaft descends so that holes can be drilled by this action at two corresponding locations on the document.
[0003]
Among these, what is called a strong punch has a punching shaft that is hollow so that more than 100 sheets of paper can be punched. Regardless, the drilling operation can be performed with a substantially constant operation force.
[0004]
[Problems to be solved by the invention]
By the way, in general, in a two-hole type punch, the cutting edge of the punching shaft is positioned at the same height, and is configured to always operate synchronously. When punching holes in a large number of sheets, The operating force is equally distributed on the punching shaft. For this reason, in particular, when the operation handle stands up and the torque arm (that is, the horizontal distance of the handle) with respect to the push-down direction is short, a considerable operation force is required temporarily, and the operation burden becomes heavy. There is. On the other hand, in order to reduce the operating force, it is conceivable that the operating lever is set to be long, the length from the rotation center to the action point for applying the operating force is set to be long, or the operating handle is made heavy. If configured in this manner, the entire punch is disadvantageously increased in weight and weight.
[0005]
The present invention has been made paying attention to such a problem, and an object of the present invention is to provide a punch capable of effectively reducing the operation force required for drilling with a simple configuration. There is.
[0006]
[Means for Solving the Problems]
In order to achieve this object, the present invention employs the following configuration.
[0007]
That is, the punch of the present invention, a plurality Bei give a hollow body shaped punching axis, with which mutually made different holes drilled timing of their punching axis, by embedding the mat for receiving the cutting edge of the punching shaft on the base The punching shaft is set so that the cutting edge positions are different at the raised position and the cutting edge positions are aligned at the lowered position. It is characterized in that it is set so that the punching axis and the cutting edge position which are lowered with a slight rise are aligned .
[0008]
Unlike a solid punching tooth, this type of hollow punching tooth has a substantially constant punching load after the cutting edge is once cut into a bundle of paper. This is because paper scraps are not pushed out like solid punching teeth but are swallowed into the hollow portion, so that the perforation conditions are substantially constant regardless of the number of sheets. Therefore, after both punching shafts are cut into a bundle of paper, the punching load is almost equal to the sum of the punching loads of the punching shafts, and it seems that the meaning of making the punching timings different from each other seems to be scarce. It is. However, as the number of punches increases, the position of the operation handle when the cutting edge of the punching shaft is cut into the first sheet becomes closer to the upright position, and it becomes difficult to input the operation force. Therefore, if the torque arm in the push-down direction is short as described above, if the drilling timing is shifted, the initial stage of the operation can be in a state in which only the operation force corresponding to the punching load of one punching shaft is applied. Therefore, the initial operability can be improved effectively. When the operation handle rotates to some extent and the torque arm becomes large to some extent, an operation force corresponding to the sum of the punching loads on the punching shaft can be applied.
[0009]
Further, the punch of the present invention, buried mat for receiving the cutting edge of the punching axis on the base, but you are so as to Kirekoma part of the cutting edge to the mat for punching shaft can pierce the one end The punching shaft is set so that the cutting edge positions are different at the raised position and the cutting edge positions are aligned at the lowered position, so that the mat is deeply cut by the preceding punching teeth by shifting the drilling timing. Can be prevented.
[0010]
Furthermore, the punching shaft that has been lowered in advance is set so that the cutting edge position is substantially aligned with the punching shaft that has been lowered with a slight rise from the lowering end, so that the above-described effects can be suitably obtained.
[0011]
As a specific embodiment for providing such an operation, the punching shaft is attached to a mounting position deviated from the center of rotation of the operation handle that is rotatably mounted at the base end via a link. In other words, the punching shafts may have different mounting positions.
[0012]
More specifically, the punching shaft is moved to the lowest lowered position when the mounting direction line connecting the rotation center of the operating handle and the mounting position of the punching shaft by the link is aligned with the link axis. Within a predetermined rotation region of the handle, the mounting position of the punching shaft that descends in advance moves after the angle between the mounting direction line and the link axis is increased to 180 degrees, and then the angle decreases. the mounting position of the punching shaft descending Te is better to set so as to move while increasing the angle in a range not exceeding 180 degrees.
[0013]
In such a configuration, in order to ensure the deviation of the drilling timing, in the initial stage of rotation of the operation handle, the connecting position with the link of the punching shaft that descends in advance, the link of the punching shaft that descends later What is necessary is just to set below the connection position.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0015]
As shown in FIGS. 1 and 2, the punch of this embodiment includes a base 1, a holding structure 2 that rises integrally from the upper end (the direction in which the paper is inserted) of the base 1, and a holding structure 2. A shaft holder 4 that is accommodated so as to be able to move up and down and holds the punching shaft 3, an operation handle 5 that is rotatably supported on the upper end side of the holding structure 2, and an operation handle 5 in the holding structure 2. And an interlocking mechanism 6 that interlocks the ascending / descending operation of the shaft holder 4 with the rotational operation.
[0016]
The base 1 is a plate having sufficient rigidity to support the holding structure 2 and the operation handle 5 that is an accessory thereof, and has an upper surface as a paper mounting surface 1a and in the vicinity of its upper end. Resin circular mats 11 for receiving the cutting edge 3a of the punching shaft 3 are embedded at two locations corresponding to the pantin shaft 3 in the section with the upper surface being substantially flush with the mounting surface 1a.
[0017]
The holding structure 2 brings the storage portion of the shaft holder 4, the mounting portion of the operation handle 5, and the storage portion of the interlocking mechanism 6 forward (that is, on the mounting surface 1 a side) with respect to the portion that contacts the base 1. Therefore, the upper end side of the bundle of paper is inserted between the lower surface 2a of the overhanging portion and the upper surface 1a of the base 1. The housing portions of the shaft holder 4 and the interlocking mechanism 6 are set in a vertical groove 22 that opens forward in a block-like structure 21 that forms a pair on the left and right. Is opened on the lower surface 2 a and the upper surface 2 b of the above-described overhang portion of the structure portion 21, and has a guide function for guiding the lifting operation of the shaft holder 4. In the drawing, bolts and the like necessary for attaching each component part are omitted.
[0018]
The shaft holder 4 has a substantially rectangular parallelepiped shape having outer dimensions approximately corresponding to the width dimension and depth dimension of the groove 22 and is accommodated in the groove 22 so as to be slidable in the vertical direction. The punching shaft 3 attached to the shaft holder 4 is in the shape of a hollow pipe. The cutting edge 3a on the lower end side cuts into a bundle of paper so that the cut waste is taken into the hollow portion, and the pushed-up scraps are sequentially pushed up. It is made to discharge | emit from the site | part suitably upwards. For this purpose, the shaft holder 4 has at least a shaft hole 4a at the axial center position, and this vertical hole 4a continues to a discharge port 4b that opens to the front.
[0019]
The operation handle 5 is formed by bending a rigid handle lever 51 into a U shape so that the operation end side is expanded, and a resin handle operation portion 52 is attached to the operation end side. Are inserted in the vicinity of the upper end of the corresponding groove 22 and the part is rotatably attached to the structure part 21 via the horizontal shaft 53. The operation handle of the present embodiment is rotated approximately 110 ° from the rotation start end position of FIGS. 3 and 4 tilted backward by approximately 20 ° from the upright position, and reaches the rotation end position of FIG. 5 and FIG. The region is a rotation region, and at the rotation start end position, the rear edge of the handle lever 51 abuts against the groove bottom of the groove 22 of the support structure 2 and is held at that position, and at the rotation end position, the base end edge of the handle lever 51 is the support structure. It hits against the groove bottom of the second groove 22 and is held in that position. The term “operation handle” does not have a meaning of limiting the shape or function thereof, and a so-called operation lever is also included in the concept of this operation handle.
[0020]
The interlocking mechanism 6 is mainly composed of a link 61 and a pair of horizontal link pins 62 and 63 that connect a portion displaced from the rotation center m of the handle lever 51 and the upper end of the shaft holder 4. Thus, the lower link pin 63 always moves up and down at the axial center position of the shaft holder 4, whereas the upper link pin 62 has a constant radius of the rotation center m as the operating handle 5 is pushed down from the vicinity of the upright position. Descent with an arc on top.
[0021]
In such a configuration, the present embodiment is such that the left and right punching shafts 3 (hereinafter, the left punching shaft when viewed from the operation handle 5 side is represented as 3L, and the right punching shaft is represented as 3R as necessary). The timing of drilling is different from each other. Specifically, the punching shafts 3L and 3R have different blade edge positions as shown in FIGS. 3 and 4 at the raised position as shown in FIGS. 3 and 4, and each blade edge position as shown in FIGS. 5 and 6 at the lowered position. It is set so that it is almost aligned.
[0022]
Therefore, the mounting position of the link pin 62 on the upper side of the link 61 is different for each punching shaft 3L, 3R. That is, in this embodiment, the connecting position (see FIG. 3) of the right punching shaft 3R that descends in advance at the rotation start end position of the operation handle 5 is the left punching shaft that descends with a delay. The cutting edge position of the punching shaft 3R is set lower than the cutting edge position of the punching shaft 3L, and is set to be lower than the connection position (see FIG. 4) with the 3L link 6. On the other hand, in this embodiment, when the attachment direction line L1 connecting the rotation center of the operation handle 5 and the attachment position of the link pin 62 is aligned with the axis L2 of the link 61, the punching shaft 3 is moved to the lowest lowered position. The mounting position of the right punching shaft 3R that descends in advance within the predetermined rotation region of the operating handle 5 moves more than aligning the mounting direction line L1 and the axis line L2 ( The mounting position of the left punching shaft 3L, which descends with a delay, is set so that it moves to a position that makes them straight and ends (see FIG. 6). As a result, the right punching shaft 3R, which has been lowered in advance, is substantially aligned with the left punching shaft 3L, which has been lowered slightly after rising slightly from the lowering end.
[0023]
FIG. 7 shows the relationship between the mounting direction line L1 and the axis line L2 corresponding to the punching shafts 3R and 3L by rotating the operation handle 5 at a pitch of 10 °. FIG. Therefore, the rotation center m is shifted and written together.
[0024]
As described above, the punch according to the present embodiment includes two hollow punching shafts 3 and the punching timings of these punching shafts 3 are different from each other. When the cutting edge 3a hits the first sheet of paper and the punching is started, the position of the operation handle 5 approaches an upright position, and the torque arm (the length of the arm in the horizontal direction of the operation handle 5) in the push-down direction becomes smaller. However, since the drilling timing is shifted, it is sufficient to apply only the operation force corresponding to the drilling load of the right punching shaft 3R at the beginning of the operation. In FIG. 9, the horizontal axis represents the displacement of the punching shaft, the vertical axis represents the perforation load, and the state of change in perforation load per punching shaft is indicated by a, which corresponds to two conventional synchronously operated punching shafts. The state of change in the perforation load is indicated by b, and the state of change in the perforation load of the present embodiment in which the drilling timing is shifted is indicated by c. As apparent from this figure, although the total load applied to both punching shafts 3R, 3L is not different from that of the synchronous operation type, according to the present embodiment, the operation handle 5 is not yet fully rotated. In the operation stage, the necessary operation force is only required for the right punching shaft 3R, and the initial drilling load can be reduced, so that the operability related to the initial operation can be effectively improved. It becomes.
[0025]
Further, the punching shafts 3R and 3L of this embodiment are set so that the respective cutting edge positions are substantially aligned at the lowered position, while the respective cutting edge positions are different at the raised position. However, even if a part of the blade edge 3a is cut into the mat 11 located at the end of the track so that the last one can be punched, the mat 11 is deeply cut by the right punching shaft 3R that has been lowered. It is possible to effectively prevent rare defects.
[0026]
As a structure for that purpose, the right punching shaft 3R that has been lowered in advance is set so that the cutting edge position is substantially aligned with the left punching shaft 3L that has been lowered with a slight rise from the lowering end. The gap at the cutting edge position imparted to the blade 11 can be effectively halved by the folding operation, and the gap at the cutting edge position necessary at the initial stage of rotation can be sufficiently imparted without impairing the effectiveness of preventing the mat 11 from being damaged. .
[0027]
As a specific configuration, the punching shaft 3 is attached via a link 61 to an attachment position that is displaced from the rotation center of the operation handle 5 that is rotatably attached to the base end. Since only the mounting positions are different for each of 3R and 3L, the structure is extremely simple and the design can be easily performed.
[0028]
That is, in the illustrated example, when the attachment direction line L1 connecting the rotation center of the operation handle 5 and the attachment position of the punching shafts 3R, 3L by the link 61 is aligned with the axis L2 of the link, the punching shafts 3R, 3L are Since it is moved to the lowest position, the mounting position of the right punching shaft 3R that descends in advance within the predetermined rotation region of the operation handle 5 is more than the straight line between the mounting direction line L1 and the axis line L2. The mounting position of the left punching shaft 3L, which moves and descends with a delay, only needs to be set so as to move to a position before making them straight, and the design standard becomes clear.
[0029]
In such a configuration, the deviation of the drilling timing is caused in the initial stage of rotation of the operation handle 5 by shifting the connecting position of the right punching shaft 3R, which is lowered in advance, with the link 61, and the left punching shaft 3L, which is lowered downward. It can be easily ensured simply by setting the position below the connection position with the link 61.
[0030]
The specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the punching shaft is attached to the position deviated from the rotation center of the operation handle by the link. However, the attachment state similar to the link can be realized by the long hole and the pin. Also, it is possible to effectively realize the deviation of the drilling timing.
[0031]
【The invention's effect】
As described above, according to the present invention, the punching load is substantially constant regardless of the number of sheets of paper, and even in a so-called strong punch that seems to have no room for improvement in operating force at first glance, a hole in the initial operation stage is used. By shifting the opening timing, it is possible to effectively reduce the initial operating force required for drilling with a simple configuration. Further, the punching shaft is set so that the respective blade edge positions are different at the raised position and the respective blade edge positions are aligned at the lowered position, so that the mat embedded in the base is advanced by shifting the drilling timing. It is possible to prevent deep cutting by the punching teeth.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of the present invention.
FIG. 2 is a side sectional view of the same embodiment.
FIG. 3 is a partially enlarged side sectional view showing a relationship between a right punching shaft and a link when an operation handle is at a rotation start end position.
FIG. 4 is a partially enlarged side sectional view showing a relationship between a left punching shaft and a link when an operation handle is at a rotation start end position.
FIG. 5 is a partially enlarged side sectional view showing the relationship between the right punching shaft and the link when the operation handle is at the rotation end position.
FIG. 6 is a partially enlarged side sectional view showing the relationship between the left punching shaft and the link when the operation handle is at the rotation end position.
FIG. 7 is a diagram showing in parallel the state of changes in the cutting edge positions of the left and right punching shafts accompanying the rotation of the operation handle.
FIG. 8 is a diagram in which the state of changes in the cutting edge positions of the left and right punching shafts accompanying the rotation of the operation handle are overlaid.
FIG. 9 is an operation explanatory diagram regarding a perforation load according to the embodiment;
[Explanation of symbols]
3a ... tooth tip 3R ... right punching shaft 3L ... left punching shaft 5 ... operation handle 61 ... link L1 ... mounting direction line L2 ... axis

Claims (4)

Multiple Bei give a hollow body shaped punching axis, with which mutually made different holes drilled timing of their punching axis, there is that embedded mat for receiving the cutting edge of the punching axis on the base,
The punching shafts are set so that each blade edge position is different at the raised position and each blade edge position is aligned at the lowered position,
2. A punch characterized in that the punching shaft that has been lowered in advance is set so that the position of the cutting edge is aligned with the punching shaft that has been lowered slightly after rising slightly from the lowering end . The punching shaft is attached via a link to a mounting position that is offset from the center of rotation of the operation handle that is rotatably mounted at the base end, and the mounting position is different for each punching shaft. The punch according to claim 1 . When the mounting direction line connecting the rotation center of the operating handle and the mounting position of the punching shaft by the link is aligned with the axis of the link, the punching shaft is moved to the lowest lowered position. The mounting position of the punching shaft that descends in advance is increased so that the angle formed by the mounting direction line and the axis of the link increases to 180 degrees, and then moves so that the angle decreases . The punch according to claim 2 , wherein the mounting position moves while increasing the angle within a range not exceeding 180 degrees . 4. The punch according to claim 3 , wherein, in the initial stage of rotation of the operation handle, the connecting position with the link of the punching shaft that descends in advance is lower than the connection position with the link of the punching shaft that descends later.

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