阅读说明：本技术 往复移动割刀装置 (Reciprocating cutter device ) 是由 清水邦夫 于 2020-05-18 设计创作，主要内容包括：本发明提供一种调整机构,能够简易地进行往复移动割刀装置中的两片刀具的间隙调整。往复移动割刀装置具备：一对往复移动割刀,在厚度方向上相互重叠的状态下配置；支撑部件,将往复移动割刀支撑为沿长边方向往复移动自由；以及调整机构,在支撑部件的下表面侧调整往复移动割刀的间隙,调整机构具备：螺丝孔,设置于支撑部件；调整螺丝,具有通过设置于往复移动割刀的长孔而与螺丝孔螺合的外螺丝部；以及螺母,与向支撑部件的上表面侧突出的外螺丝部螺合而固定外螺丝部和支撑部件,在向支撑部件的上表面侧突出的外螺丝部设置有操作调整螺丝的旋转的被操作部。(The invention provides an adjusting mechanism which can simply adjust the clearance between two cutters in a reciprocating cutter device. The reciprocating cutting knife device is provided with: a pair of reciprocating cutters arranged in a state of being overlapped with each other in a thickness direction; a support member that supports the reciprocating cutter so as to be free to reciprocate in the longitudinal direction; and an adjusting mechanism for adjusting the clearance of the reciprocating cutting knife on the lower surface side of the supporting component, wherein the adjusting mechanism comprises: a screw hole provided in the support member; an adjusting screw having an outer screw portion screwed with the screw hole through a long hole provided in the reciprocating cutter; and a nut that is screwed to the male screw portion protruding toward the upper surface side of the support member to fix the male screw portion and the support member, wherein an operated portion that operates rotation of the adjustment screw is provided on the male screw portion protruding toward the upper surface side of the support member.)

1. A reciprocating cutting knife device is characterized by comprising:

a pair of reciprocating cutters arranged in a state of overlapping each other in a thickness direction;

a support member that supports the reciprocating cutter blade so as to be free to reciprocate in the longitudinal direction; and

an adjusting mechanism for adjusting the clearance of the reciprocating cutter on the lower surface side of the supporting member,

the adjustment mechanism includes:

a screw hole provided in the support member;

an adjusting screw having an outer screw portion screwed with the screw hole through a long hole provided in the reciprocating cutter; and

a nut screwed to the outer screw portion protruding toward the upper surface side of the support member to fix the outer screw portion and the support member,

an operated portion for operating rotation of the adjustment screw is provided on the male screw portion projecting toward the upper surface side of the support member.

2. The reciprocating cutter device as defined in claim 1,

the operated portion is a cutaway groove provided at the tip of the outer screw portion.

3. The reciprocating cutter device as defined in claim 1,

the operated portion is a hole portion provided at a distal end portion of the outer screw portion.

4. The reciprocating cutter device as defined in any one of claims 1 to 3,

a transmission housing in which the support member is independently mounted,

by detaching the adjustment screw, the reciprocating cutter can be detached from the support member in a state where the support member is attached to the transmission housing.

Technical Field

The invention relates to a reciprocating cutter device.

Background

As a device having a reciprocating cutting knife device provided with a reciprocating (so-called pusher) cutting knife, a harvester (hedge trimmer) is generally known which performs a cutting and trimming operation of branches and leaves (see patent document 1 below).

Further, since the reciprocating cutter blade has an advantage that it is difficult to generate scattered objects during operation as compared with a rotary blade and a nylon cutter used in a general trimmer, a trimmer has been proposed in which a reciprocating cutter blade device is provided at the tip of a hand-held operating lever to perform mowing operation on the ground surface, taking advantage of the advantage (see patent document 2 below).

One of the reciprocating cutters includes a flat-plate-shaped base portion extending in the longitudinal direction and a plurality of blade portions protruding from the base portion in a direction intersecting the longitudinal direction, and the two cutters are stacked in the thickness direction to form a pair of reciprocating cutters. The pair of reciprocating blades reciprocates in the longitudinal direction while sliding on the contact surfaces, thereby applying a cutting action to an object sandwiched between the blade portion of one blade and the blade portion of the other blade.

In such a reciprocating cutting knife, the gap between the two knives greatly affects the cutting performance (sharpness) of the cutting knife. In order to ensure a good cutting quality of the cutting blade, it is necessary to adjust the gap between the two cutters to an appropriate width. When the cutter is used to some extent, the cutter wears and the gap between the two cutters is enlarged, thereby reducing the cutting quality. A conventional reciprocating cutting knife device includes an adjustment mechanism that is capable of adjusting the gap between two knives in order to restore the sharpness of the cutting knife by abrasion of the knives (see patent document 1 below).

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2008-136370

Patent document 2: japanese patent laid-open publication No. 2016-49082

Disclosure of Invention

In a conventional adjusting mechanism having a structure in which two cutters are slidably supported in a state of being overlapped on a lower surface side of a support plate, an outer screw portion of an adjusting screw penetrating through a spacer and elongated holes of the two cutters is screwed to an inner screw portion provided in the support plate, the two cutters are disposed between the spacer and the support plate, and a clearance between the two cutters is adjusted by increasing or decreasing a screw state of the adjusting screw. Then, a nut is screwed to the outer screw portion of the adjusting screw protruding toward the upper surface side of the support plate to fix the outer screw portion and the support plate, and the adjusted gap is maintained.

When the clearance between the two cutters is adjusted by such an adjustment mechanism, the operator first loosens the nut on the upper surface side of the support plate and screws the adjustment screw (rotates the bolt) to the lower side of the two cutters. Then, in order to provide an appropriate gap between the two cutters, the adjusting screw is loosened by half a turn from the lower side of the two cutters. Thus, when an appropriate gap is secured, the adjusting screw is held by a tool from below the two cutters so as not to rotate, and the nut on the upper surface side of the support plate is tightened to fix the adjusted gap.

Accordingly, since the operator who performs adjustment performs the tightening and loosening of the nut on the upper surface side of the support plate and the tightening of the adjustment screw on the lower sides of the two cutters, the operator performs the operation while rotating the hand portions on the upper side and the lower side with respect to the cutters, respectively, and alternately visually checking the upper side and the lower side of the cutters, and the operation of constantly paying attention to the contact with the cutters becomes a problem, and the adjustment operation becomes troublesome.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an adjustment mechanism that can easily adjust the gap between two knives in a reciprocating cutter device.

In order to solve the above problem, the present invention has the following configuration.

A reciprocating cutting knife device is characterized by comprising: a pair of reciprocating cutters arranged in a state of overlapping each other in a thickness direction; a support member that supports the reciprocating cutter blade so as to be free to reciprocate in the longitudinal direction; and an adjustment mechanism that adjusts a gap of the reciprocating cutting blade on a lower surface side of the support member, the adjustment mechanism including: a screw hole provided in the support member; an adjusting screw having an outer screw portion screwed with the screw hole through a long hole provided in the reciprocating cutter; and a nut that is screwed to the outer screw portion protruding toward the upper surface side of the support member to fix the outer screw portion and the support member, wherein an operated portion that operates rotation of the adjustment screw is provided in the outer screw portion protruding toward the upper surface side of the support member.

Effects of the invention

According to the present invention having such a feature, the nut screwed with the external screw portion protruding to the upper side of the support member is loosened, the operated portion provided to the external screw portion protruding to the upper side of the support member is operated using the tool to rotate the adjustment screw, thereby adjusting the gap, and the nut screwed with the external screw portion can be fastened to the upper side of the support member to fix the external screw portion of the adjustment screw to the support member. Thus, the gap between the reciprocating cutting blades can be adjusted by only the operation of the upper side of the support member, and the gap between the two reciprocating cutting tools can be adjusted safely and easily.

Drawings

Fig. 1 is an explanatory view showing a main part of a reciprocating cutting knife device according to an embodiment of the present invention.

Fig. 2 is a sectional view showing a main part of the reciprocating cutting knife device according to the embodiment of the present invention.

Fig. 3 is a sectional view showing a main part of a reciprocating cutter device according to another embodiment of the present invention.

Fig. 4 is an external perspective view showing an example of an embodiment of the reciprocating cutting blade device.

Fig. 5 is an exploded perspective view showing an example of an embodiment of the reciprocating cutting knife device.

Fig. 6 is an explanatory diagram showing an example of a hand-held working machine including a reciprocating cutting blade device.

In the drawings, 1: a reciprocating cutter device,

2: reciprocating cutter (knife), 2A, 2B: a cutter,

20: base, 20A: long hole, 20B: recess, 21: a blade part,

3: support member, 3A: go up backup pad, 3B: a lower supporting plate,

30: spacer, 31: mounting screws, 31A: a screw hole,

32: fastening screw, 32A: a fastening part,

4: transmission housing, 4A: hole, 40A, 40B: a reciprocating movable body,

40 t: coupling part, 40 m: engagement hole, 40 n: a guide hole,

41: cam, 42: guide member, 42A: a guide sheet,

43: lever attachment portion, 43A: an angle adjusting mechanism,

10: handheld work apparatus, 11: operating lever, 12: a driving part,

13: operating handle, 13A: a holding part,

14: housing, 14A: rear handle, 14B: an operation switch,

15: a battery component,

100: adjustment mechanism, 101: screw hole, 102: adjusting screw, 102A: an external screw part,

103: nut, 104: a gasket,

200: operated unit, 200A: grooving section, 200B: a hole portion.

Detailed Description

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same reference numerals in different drawings denote the same functional parts, and the overlapping description in each drawing is appropriately omitted.

Fig. 1 and 2 show the main parts of the reciprocating cutting blade device of the present invention. The reciprocating cutting knife device 1 includes: a pair of reciprocating cutting blades (hereinafter, simply referred to as "blades") 2 arranged in a state of overlapping each other in the thickness direction; and a support member 3 for supporting the cutting blade 2 so as to be movable back and forth in the longitudinal direction, and an adjustment mechanism 100 for adjusting the gap between the pair of cutting blades 2 on the lower surface side of the support member 3.

The cutter blade 2 is disposed in a state where two blades 2A and 2B made of metal plates are overlapped with each other in the thickness direction (the Z direction in the figure). Each of the cutters 2A and 2B constituting the cutting blade 2 includes: a flat plate-like base portion 20 extending in the longitudinal direction (X direction in the figure); and a plurality of blade portions 21 projecting in a direction (Y direction in the figure) intersecting the longitudinal direction.

The base 20 of the blades 2A and 2B is supported by the support member 3, and a plurality of elongated holes 20A are provided along the longitudinal direction (X direction in the figure) of the blade 2. The blade portions 21 provided in the blades 2A and 2B may be provided on both sides in the Y direction as shown in the drawing, or may be provided only on one side. The blade portion 21 is a so-called clipper blade, and by sliding the two blades 2A and 2B in the longitudinal direction, a cutting action is exerted on grass or the like sandwiched between the blade portion 21 of one blade 2A and the blade portion 21 of the other blade 2B.

The support member 3 supports the base 20 of the pair of blades 2 (the tools 2A and 2B) so as to be movable in the longitudinal direction (the X direction in the figure). The support member 3 is a plate-like member disposed along the longitudinal direction of the cutting blade 2, and may support the pair of cutting blades 2 alone or may support the pair of cutting blades 2 so that the base 20 of the pair of cutting blades 2 is sandwiched between two plate-like members.

The adjustment mechanism 100 adjusts the gap between the pair of blades 2 on the lower surface side of the support member 3. Each of the cutters 2A (2B) is a thin and thick plate material, and does not have rigidity as a cutter in a single body, but rigidity as a cutter is obtained by overlapping two cutters 2A and 2B. In this case, the gap between the two is required to be small in the sliding resistance during the reciprocating movement, but if the gap is larger than necessary, the cutting performance (sharpness) is reduced.

When the blade portion 21, the base portion 20, or the upper and lower support plates 3A and 3B of the blade 2 are worn due to repeated use, the clearance between the two blades 2A and 2B becomes large and the cutting quality thereof becomes dull, and therefore, the adjustment of the clearance between the two blades 2A and 2B becomes important maintenance in order to maintain the cutting quality of the blade 2. When the cutting edges 2A and 2B become dull, the cutting edges are restored by adjusting the interval between the cutting edges 2A and 2B to an appropriate interval by the adjusting mechanism 100.

The adjustment mechanism 100 includes: a screw hole 101 provided in the support member 3; an adjusting screw 102 having an external screw portion 102A screwed into the screw hole 101 through a long hole 20A provided in the cutting blade 2; and a nut 103 that is screwed into an external thread portion 102A protruding toward the upper surface side of the support member 3 to fix the external thread portion 102A and the support member 3.

In the adjustment mechanism 100, an operated portion 200 for operating the rotation of the adjustment screw 102 is provided on a male screw portion 102A projecting toward the upper surface side of the support member 3. In the example shown in fig. 1 and 2, the operated portion 200 is a recessed groove portion 200A provided at the tip of the male screw portion 102A, and the adjusting screw 102 can be operated from the upper surface side of the support member 3 by engaging a tool such as a horizontal screwdriver with the recessed groove portion 200A.

In the illustrated example, the adjustment mechanism 100 adjusts the gap between the cutters 2A and 2B by passing an adjustment screw 102 through the elongated hole 20A from the lower side of the cutter blade 2 via a spacer 104, screwing a male screw portion 102A of the adjustment screw 102 into a screw hole 101 of the support member 3, and adjusting the gap between the spacer 104 and the support member 3.

When the clearance between the tools 2A and 2B is adjusted by the adjustment mechanism 100, first, the tool is engaged with the operated portion 200 of the adjustment screw 102 from above the support member 3 to prevent the rotation of the adjustment screw 102, and the nut 103 located above the support member 3 is loosened. Then, the gap adjustment is performed by turning the adjustment screw 102 from above the support member 3 using a tool engaged with the operated portion 200. Finally, in a state where the rotation of the adjustment screw 102 is prevented from the upper side of the support member 3 by using a tool engaged with the operated portion 200, the nut 103 positioned on the upper side of the support member 3 is tightened, and the adjustment screw 102 is fixed to the support member 3.

According to the adjustment mechanism 100, the operator can perform the adjustment operation while only visually checking the upper side of the cutting blade 2 without rotating the hand to operate the adjustment screw 102 on the lower surface side of the tools 2A and 2B. This enables the clearance between the tools 2A and 2B to be adjusted easily and safely.

Fig. 3 shows another example of the mode of the operated unit 200 in the adjustment mechanism 100. In this example, the operated portion 200 is configured by a hole 200B provided at the distal end of the male screw portion 102A of the adjusting screw 102. By inserting a pin-shaped tool into the hole 200B and operating the adjustment screw 102 in the same manner as in the above-described example, the operator can perform the adjustment operation while only visually checking the upper side of the cutting blade 2, and can easily and safely adjust the clearance between the cutters 2A and 2B.

Fig. 4 and 5 show an example of an embodiment of the reciprocating cutting knife device including the adjustment mechanism. Here, an example in which the cutting blade is arranged in a T-shape is described, but the mode of reciprocating the cutting blade device is not particularly limited to this.

The reciprocating cutting knife device 1 has a drive housing 4. The transmission housing 4 is provided with a transmission mechanism for reciprocating the cutting blade 2. The transmission mechanism converts rotation of a drive shaft (not shown) into reciprocating motion, and includes reciprocating bodies (connecting rods) 40(40A, 40B) and a cam 41 supported so as to be capable of reciprocating along the longitudinal direction (X direction shown) of the cutting blade 2.

The reciprocating movable body 40(40A, 40B) includes a coupling portion 40t coupled to the base portion 20 of each of the tools 2A, 2B. The coupling portion 40t has a convex portion protruding in a direction (the illustrated Y direction) orthogonal to the longitudinal direction of the blade 2. A recess 20B, into which the coupling portion 40t (projection) engages, is provided in a coupled portion of the base portion 20 to which the coupling portion 40t is coupled.

In the illustrated example, the reciprocating movable bodies 40(40A, 40B) each include: an engaging hole 40m into which the cam 41 is engaged; and a guide hole 40n fitted to a guide piece 42A of a guide member 42 in the transmission housing 4. The guide holes 40n are provided in a pair on both left and right sides of the engagement hole 40m in the illustrated X direction.

The support member 3 is attached to the transmission housing 4, and supports the pair of cutting blades 2 (the tools 2A and 2B) so as to be movable in the longitudinal direction (the X direction in the figure) with the base portions 20 of the cutting blades 2 interposed therebetween. In the illustrated example, the support member 3 includes a pair of support plates (an upper support plate 3A and a lower support plate 3B) extending in the longitudinal direction (the illustrated X direction) of the cutting blade 2.

The upper support plate 3A and the lower support plate 3B of the support member 3 are fastened and coupled to each other with the spacer 30 interposed therebetween, so that a space for accommodating the pair of blades 2 is maintained, and the support member is attached to the transmission case 4 independently of the space. The pair of blades 2 are accommodated in the space and detachably attached to the support member 3.

The fastening, connecting and supporting structure of the cutting blade 2 and the supporting member 3 will be specifically described with reference to fig. 5. First, the upper support plate 3A of the support member 3 is mounted independently of the transmission case 4 by inserting the mounting screws 31 through the holes 4A of the transmission case 4 and screwing them into the screw holes 31A of the upper support plate 3A. On the other hand, the upper support plate 3A and the lower support plate 3B are fastened and connected by a fastening screw 32 at a fastening and connecting portion 32A that does not interfere with the pair of cutting blades 2. The fastening screw 32 is screwed into the fastening portion 32A of the upper support plate 3A through the hole of the lower support plate 3B and the spacer 30. Thereby, the upper support plate 3A and the lower support plate 3B are fastened and coupled with a thickness space of the spacer 30 secured therebetween, and are attached to the transmission housing 4 in this state.

The pair of blades 2 (cutters 2A and 2B) sandwiched between the upper support plate 3A and the lower support plate 3B are supported by the support member 3 so as to be able to reciprocate at a position different from the fastening position 32A by an adjustment screw 102. Here, two adjustment screws 102(a) and 102(d) of the four adjustment screws 102(a to d) are inserted into the spacer 104 as described above, screwed into the screw holes 101 of the upper support plate 3A through the long holes 20A of the pair of cutting blades 2, and fixed with the nuts 103. The other two adjustment screws 102(B) and 102(c) are inserted into holes of the lower support plate 3B, screwed into screw holes 101 of the upper support plate 3A through the long holes 20A of the pair of cutters 2, and fixed by nuts 103.

In this case, the adjusting screws 102(a) and 102(d) can adjust the gap between the two cutters 2A and 2B sandwiched therebetween by adjusting the gap between the spacer 104 and the upper support plate 3A, and the adjusting screws 102(B) and 102(c) can adjust the gap between the two cutters 2A and 2B sandwiched therebetween by adjusting the gap between the upper support plate 3A and the lower support plate 3B.

Here, the positions where the pair of blades 2 are supported by the support member 3 (upper support plate 3A) are located at different positions from the screw holes 31A where the support member 3 (upper support plate 3A) is mounted to the transmission case 4 by the mounting screws 31 by the adjustment screws 102(a to d). Thus, the pair of cutting blades 2 can be removed with the support member 3 attached to the transmission case 4 only by removing the adjustment screws 102(a to d).

The spacer 30 is interposed between the upper support plate 3A and the lower support plate 3B, but since the adjustment screws 102(B) and 102(c) are provided at a position different from the fastening position 32A where the upper support plate 3A and the lower support plate 3B are fastened via the spacer 30, the upper support plate 3A and the lower support plate 3B are elastically deformed by tightening the adjustment screws 102(B) and 102(c) to adjust the interval therebetween.

The pair of cutting blades 2 can be easily attached and detached without disassembling the reciprocating cutting blade device 1 by detaching only the adjustment screw 102. That is, the adjustment screw 102 is pulled out by removing only the nut 103 from the adjustment screw 102 and removing the adjustment screw 102 from the screw hole 101 of the upper support plate 3A, and the relationship between the pair of blades 2 and the support member 3 (the upper support plate 3A and the lower support plate 3B) is free. In the illustrated example, the row of the adjustment screws 102 is set to be different from the row of the fastening screws 32 so that screws handled when detaching the pair of cutting blades 2 from the reciprocating cutting blade device 1 are not mistaken.

Since the coupling portion 40t of the reciprocating movable body 40 is coupled to the base portion 20 of the blade 2 and the convex portion protruding in the Y direction of the coupling portion 40t is engaged with the concave portion 20B recessed in the same direction as the base portion 20, the pair of blades 2 can be easily detached from the support member 3 by pulling out the pair of blades 2 in the Y direction.

Fig. 6 shows an example of a hand-held working machine including the reciprocating cutting blade device 1. The illustrated handheld work machine 10 includes an operation lever 11, and a distal end portion of the operation lever 11 is attached to an operation lever attachment portion 43 disposed in the transmission case 4. The operation lever attachment portion 43 is disposed on the transmission housing 4 via an angle adjustment mechanism 43A, and the rising angle of the operation lever 11 with respect to the working surface of the cutting blade 2 can be adjusted by the angle adjustment mechanism 43A.

A drive shaft (not shown) for transmitting power to the transmission mechanism is provided inside the operating lever 11. Further, a drive portion 12 for driving a drive shaft is disposed at the base end of the operation lever 11, and an operation knob 13 is provided at the base end side of the operation lever 11. The operating handle 13 has a grip portion 13A on the upper side of the operating lever 11.

The driving unit 12 drives the reciprocating cutting knife device 1 via a driving shaft in the operation lever 11, and includes a housing 14 in which a motor disposed substantially coaxially with the operation lever 11 is housed. The housing 14 is provided with a rear handle 14A having an operation switch 14B for opening and closing the reciprocating cutting blade device 1, and a battery pack 15 for supplying power to a motor in the housing 14 is provided outside.

The handheld working machine 10 is an electric trimmer including the reciprocating cutting blade device 1, and is arranged in a direction in which the longitudinal direction of the cutting blade 2 intersects the longitudinal direction of the operation lever 11, whereby the reciprocating cutting blade device 1 is arranged in a T-shape at the tip of the operation lever 11. The hand-held power tool 10 performs a cutting operation while driving the reciprocating cutting blade device 1 and moving the reciprocating cutting blade device 1 along the ground surface in a state where an operator holds the operation handle 13 and the rear handle 14A of the housing 14 in his/her hand and sets the operation lever 11 at a predetermined rising angle with respect to the ground surface.

According to the handheld work machine 10, even if the operation lever 11 is not swung to the left and right, the width of the cutting blade 2 of the reciprocating cutting blade device 1 in the longitudinal direction becomes the working width, and the operator can perform the trimming operation in the working width only by pressing the operation lever 11 forward. Therefore, the reciprocating cutting blade device 1 can be quickly moved forward and the work can be performed, and the trimming work with high work efficiency can be realized. Further, since the cutting operation is performed by moving the cutting blade repeatedly, the generation of scattered objects during the operation can be suppressed. This enables the trimming operation to be performed without damaging the assets of other people near the work site while ensuring the safety of the operator and the surroundings thereof.

Further, according to the handheld work machine 10, since the gap adjustment of the pair of cutting blades 2 can be performed easily and safely, a work machine with high maintainability can be provided for repeated work.

While the embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention is also encompassed by design changes and the like that do not depart from the scope of the present invention. In the above embodiments, the respective technologies can be combined along with each other as long as there is no particular contradiction or problem with the object, the structure, and the like.