JP2002254403A - Jig saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To position a sleeve at an unlocked position by a simple structure in a jig saw which is equipped with a cramp device for changing a blade in an unlocked state or in a locked state by rotation of a sleeve. SOLUTION: The jig saw is equipped with a housing, a driving shaft, a cramp device 26, an operating component and a blade. The driving shaft is reciprocated to the housing. The cramp device 26 is attached to a tip of the driving shaft, which comprises a chuck 32 and a sleeve 33 being rotated around the chuck 32. The blade is freely detachably fixed to the chuck 32. The operating component is changed in an unlocked state wherein the blade is attached to or detached from the chuck 32, or in a locked state wherein the blade is fixed by rotating the sleeve 33. Then a position in the unlocked state of the sleeve 33 is determined because pivot of the sleeve 33 is controlled with the chuck 32. In the jig saw constituted as described above, the sleeve 33 can be positioned at an unlocked position only by raising a precision of the part wherein rotation of the sleeve 33 is controlled by the chuck 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a jigsaw, and more particularly to a technique for fixing a blade to a drive shaft.

[0002]

2. Description of the Related Art A jigsaw is used for cutting a wood plate, a mild steel plate or the like. In a jigsaw, in order to replace a blade (saw blade) that has become poorly cut or broken, a clamp device for detachably fixing the blade to the tip of a drive shaft is usually provided. As such a clamp device, for example, a device described in Japanese Patent Publication No. 7-102523 is known. The clamp device described in the above publication includes a chuck for fixing the blade, and a sleeve rotatable around the chuck. The sleeve can be rotated from an initial position (a position where the blade cannot be attached to and detached from the chuck) from an initial position (a position where the blade can be attached to and detached from the chuck) by operating a separately provided operating member. Further, the coil spring is urged to rotate from the unlock position to the initial position. Therefore, in order to replace the blade, the operating member is operated to rotate the sleeve to the unlock position against the urging force of the coil spring, and the blade is replaced in this state (unlocked state). When the operating member is returned to the original position after replacing the blade, the sleeve is rotated to the initial position side by the urging force of the coil spring, and the blade is fixed to the chuck (locked state).

[0003]

In the above-described clamp device, the blade can be replaced simply by operating the operating member, so that the blade replacement operation can be easily performed. However, it has the following problems. I was That is,
In the clamp device described above, the sleeve is positioned at the unlock position by regulating the movable range of the operation member. In other words, the sleeve itself can rotate beyond the unlock position, but when the sleeve is in the unlock position, it cannot be moved due to the operation member abutting against the stopper, and the sleeve is positioned at the unlock position. Had become. For this reason, in the clamp device, in order to position the sleeve at the unlock position, it is necessary to improve the accuracy of the relative positional relationship between the operating member and the sleeve. However, the relative positional relationship between the operating member and the sleeve is determined by many members (housing, drive shaft driving mechanism, operating member, clamp device, drive shaft, etc.) interposed between the operating member and the sleeve. Therefore, it has been difficult to improve the accuracy of the relative positional relationship between the operation member and the sleeve. Therefore, even if the operating member is rotated to the position where it comes into contact with the stopper, the sleeve cannot be located at the unlock position, that is, the position where the blade can be attached to and detached from the chuck, and the blade can be attached and detached smoothly. Did not.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a jigsaw that has a simple structure and can easily position a sleeve at an unlock position.

[0005]

Means for Solving the Problems, Functions and Effects In order to solve the above problems, a jigsaw according to claim 1 includes a housing, a drive shaft, a clamp device, an operation member, and a blade. ing. The drive shaft reciprocates with respect to the housing. The clamp device is attached to the tip of the drive shaft, and includes a chuck and a sleeve rotatable around the chuck. The blade is detachably fixed to the chuck. The operating member switches between an unlocked state in which the blade is attached to and detached from the chuck and a locked state in which the blade is fixed by rotating the sleeve. The position of the sleeve in the unlocked state is determined by the rotation of the sleeve being restricted by the chuck. In the above jigsaw, the position of the sleeve in the unlocked state (unlock position) is determined by the rotation of the sleeve being restricted by the chuck. That is, the sleeve can be accurately positioned at the unlock position only by adjusting the relative positional relationship between the sleeve and the chuck. Therefore, the operating member only has to perform the function of rotating the sleeve, and there is no need to precisely adjust the relative positional relationship between the operating member and the sleeve. For this reason, the sleeve can be easily positioned at the unlock position, and the blade can be replaced smoothly.

In the jigsaw according to the first aspect, the sleeve is urged to rotate in a direction from the unlocked state to the locked state, and when the blade is not mounted on the clamp device, the sleeve is locked. It is preferable that rotation in a certain direction is restricted by the chuck (claim 2). In the above jigsaw, since the sleeve is urged to rotate from the unlocked state to the locked state, the blade is fixed to the clamp device (chuck) in a stable state. Further, even if the sleeve is urged in the direction to be in the locked state, the rotation of the sleeve in a state where the blade is not mounted on the clamp device is regulated by the chuck. It can be in a non-contact state. Therefore, according to the above jigsaw, even if the jigsaw is operated by mistake without attaching the blade to the clamp device, it is possible to prevent the operation member and the clamp device from being damaged.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The jigsaw according to the above-mentioned claims can be suitably implemented in the following forms. (Embodiment 1) The sleeve is urged by a coil spring in a direction in which the sleeve is locked. The coil spring and the sleeve are coaxially arranged and at least partially overlap in the axial direction of the drive shaft. Are located. In such a form, the sleeve and the coil spring that urges the sleeve in the locking state are arranged so that at least a part thereof overlaps in the axial direction of the drive shaft. For this reason, it is possible to prevent the clamp device from being lengthened in the axial direction of the drive shaft.

[0008]

EXAMPLES Regarding a jigsaw according to an example of the present invention,
This will be described with reference to the drawings. First, the configuration of the entire jigsaw will be briefly described with reference to FIG. Jigsaw 1
The housing 12 accommodates an electric motor as a drive source, a transmission mechanism that is constituted by gears, cams and the like and converts the rotation of the electric motor into reciprocating motion of the drive shaft 24 (the electric motor and the transmission mechanism). Are not shown). A power cord 16 for supplying power to the jigsaw 10 from the outside is attached to the rear end of the housing 12 (the right side of the jigsaw 10 shown in FIG. 1, the left side is the front, the upper side is the upper side, the lower side. Below, the same applies hereinafter). A plurality of air holes 12b through which air for cooling the inside is formed on a side surface of the housing 12, and an upper portion of the housing 12
Handle 12a for the user to operate the jigsaw 10
Is provided. A trigger switch 14 is mounted on the handle 12a at a position where the user can easily operate the handle 12a with his / her fingertip while holding the handle 12a. The trigger switch 14 is turned on when depressed with a finger, and returns to the original state and is turned off when the finger is released. This trigger switch 1
The on / off of 4 switches between energization and cutoff of electric power to the electric motor, whereby the operation and stop of the jigsaw 10 can be controlled.

A base 18 is fixed to a lower portion of the housing 12. The lower surface 18a of the base 18 is formed in a planar shape, and has a function of stabilizing the jigsaw 10 with respect to an object to be cut. When performing the cutting operation, the lower surface 18a of the base 18 is pressed against the surface of wood or the like to be cut, and the jigsaw 10 is moved forward. The base 18 is formed in a U-shape with an open front side.
The blade 22 reciprocates vertically through the opening. In the lower part of the housing 12 and near the blade 22,
A substantially cylindrical back roller 19 is rotatably mounted. The back roller 19 has a circumferential groove formed in its cylindrical surface, and the rear end of the blade 22 is inserted into this groove. With such a configuration, the backward force applied to the blade 22 when the cutting operation is performed is received by the back roller 19. Also,
A suction port 12 is provided near the blade 22 of the housing 12.
d is formed, and a dust collection hose mounting port 12 c is formed behind the housing 12. The suction port 12 d and the dust collection hose mounting port 12 c communicate with each other in the housing 12. Therefore, when the dust collecting hose arranged outside the jigsaw 10 is attached to the dust collecting hose mounting port 12c and operated, the chips generated during the cutting operation can be sucked from the suction port 12d.

Next, the structure of the clamp device 26 to which the blade 22 is fixed, the operation member 52 for switching the clamp device 26 between the unlocked state and the locked state, and the like will be described. As shown in FIG. 2, a clamp device 26 for detachably fixing the blade 22 is attached to a lower end of the drive shaft 24. The upper end of the drive shaft 24 is connected to the end of the transmission mechanism built in the housing 12 so that the reciprocating motion of the end of the transmission mechanism is transmitted to the drive shaft 24. The clamp device 26 is composed of a chuck 32 and a sleeve 33 as shown in FIGS. 3 and 4 (FIGS. 3 and 4 show a state in which the blade 22 is not mounted on the clamp device 26. Shown). The chuck 32 includes a rod 37, a pin 42, a coil spring 44, and the like, which will be described later.

The sleeve 33 is formed in a shape in which large-diameter and small-diameter substantially cylindrical members are connected vertically, and the inner surface of the cylindrical shape is in contact with the outer periphery of the rod 37. Therefore, the sleeve 33 rotates around the rod 37 while contacting the outer periphery of the rod 37. As best shown in FIG. 3, a groove 33a is formed along the circumference on the inner surface of the cylinder above the sleeve 33, and a circlip 35 is fitted in the groove 33a. The lower surface of the circlip 35 contacts the upper surface of a flange 37k formed on the rod 37. A rubber cap 39 for dust prevention is press-fitted into the sleeve 33. On the other hand, at the lower end 33b of the sleeve 33, as shown in FIG. 11, a round hole 33k and a rectangular slit 33f are formed so as to straddle the round hole 33k. The upper surface of the lower end 33 b of the sleeve 33 contacts the lower end surface of the rod 37.
For this reason, the movement of the sleeve 33 in the axial direction is restricted, and the sleeve 33 is mounted on the rod 37. Also, the sleeve 33
Is formed with a protruding portion 33g protruding outward from the outer periphery thereof, and a hook-shaped hook portion 33h is formed at the tip of the protruding portion 33g. Further, a cam 33c is formed on the sleeve 33, as shown in FIG. The cam surface of the cam 33c is formed in a shape in which the distance from the rotation center of the sleeve 33 gradually changes according to the rotation angle of the sleeve 33. Also, at both ends of the cam 33c,
The contact portions 33d and 33e projecting in the axial center direction are formed.

As shown in FIGS. 3 and 4, the rod 37 is formed with a slit 37a which is deeply cut upward from the lower end thereof. The rod 37 is formed with a through hole 37b having a rectangular cross section penetrating from the outer surface to the slit 37a.
A pin 42 having a substantially rectangular parallelepiped shape, which is long in the vertical direction, is inserted. The head 42b of the pin 42 on the cam 33c side is
As shown in FIG. 2, pin contact portions 42a, 42a extending in the outer peripheral direction of the rod 37 are formed. The pin 42 has an inclined surface 42c. The slope portion 42c has a function of pushing the pin 42 back to the cam 33c when the blade 22 is inserted into the clamp device 26. A helix-shaped coil spring 44 is mounted around the rod 37 described above. As shown in FIGS. 3 and 4, one end 44a of the coil spring 44 is
g is inserted into a hole 33j formed in the rod 37, and the other end 44b is inserted into a hole 37d formed in the rod 37 in a biased state. For this reason, the sleeve 33 is urged in the direction of arrow 43 by the coil spring 44, and the contact portion 33d of the cam 33 and the pin contact portion 42a of the pin 42 come into contact with each other, whereby the rotation shown in FIG. The movement position is regulated (the position of the sleeve 33 is referred to as an “initial position”; the same applies hereinafter). In this state, the end 42d of the pin 42 projects into the slit 37a of the rod 37.

As shown in FIG. 16, a leaf spring 62 (leaf spring) sandwiched between a circlip 35 and a flange 37k of the rod 37 is mounted in the slit 37a of the rod 37. ing. When the blade 22 is inserted into the slit 37a of the rod 37, the leaf spring 62
And urges the blade 22 downward.

The operation member 52 is formed of a transparent material, and is mounted on a lower front portion of the housing 12 as shown in FIG. As shown in FIGS. 11 and 15, the planar shape of the operation member 52 is formed in a substantially U shape, and a shaft hole 52a is formed at one end of the substantially U shape. The housing 12 is inserted into the shaft hole 52a.
The operating member 52 is attached to the housing 12 so as to be rotatable around the rod-shaped shaft 53 by inserting the rod-shaped shaft 53 fixed thereto. A coil spring 54 is mounted between the operation member 52 and the housing 12 while being wound around a shaft 53 as shown in FIG. Therefore, the operation member 52
Is urged by the coil spring 54 in a direction opposite to the arrow 56 (hereinafter, the direction of the arrow 56 is referred to as an opening direction and the opposite direction is referred to as a closing direction).

At the other end of the operation member 52, an operation portion 52b, a locking portion 52c, and a hook portion 52d are formed as shown in FIG. The operation portion 52b is formed to protrude outward so that the user can operate the operation member 52 to rotate the operation member 52 around the shaft 53. On the other hand, the hook portion 52d is formed so as to protrude in the direction (inside) opposite to the operation portion 52b, and has a hook-shaped hook portion 52e formed at its tip. The hook 52e of the hook 52d is
When the user rotates the operation member 52 in the opening direction, the operation member 52 is hooked on the hook 33h of the protrusion 33g of the sleeve 33, whereby the sleeve 33 rotates together with the operation member 52. The locking portion 52c of the operation member 52 is formed so as to protrude from the operation portion 52b of the operation member 52 toward the housing 12, and a hook portion 52f is formed at the tip thereof. On the other hand, a stopper 12e and a locking member 58 are provided on the housing 12, and a hook-shaped hook portion 58a is formed at the tip of the locking member 58. And the operation member 5
2 is not held by the user, the operating member 52 is urged by the coil spring 54 to rotate in the closing direction, and comes into contact with the stopper 12e formed on the housing 12, and at the same time, the hook of the locking member 58 The hook portion 52f of the operation member 52 climbs over the portion 58a, and the operation member 52
(Locking member 58). In order to release the locked state, it is necessary to apply a force to the operating member 52 that is greater than the urging force of the coil spring 54 and that can release the locked state between the hook 52f and the hook 58a. (Operation member 52
However, the position where the operation member 52 is in contact with the stopper 12 e is referred to as the “closed position” of the operation member 52. same as below).

FIG. 17 shows a side view of the blade 22. Thickness of blade 22 (in the direction perpendicular to the plane of the drawing)
The type (for example, 0.9 mm, 1.8 mm) that varies depending on the object to be cut (wood plate, mild steel plate, etc.) and the cutting method (high-speed cutting, turning cutting, etc.) is used. The blade 22 includes a plurality of blades 22a, and the blades 22a are pressed against a wood plate or the like to be cut while reciprocating to perform cutting. Upper end surface 22 of blade 22
d is formed in a trapezoidal shape. Further, a retaining projection 22b is formed on the upper end side of the blade 22, and when the blade 22 is mounted on the clamp device 26, the retaining projection 22b functions as a retaining (details will be described later). .

The configuration of the clamp device 26, the operation member 52, and the like has been described above. Next, operations for mounting, fixing, and removing the blade 22 to and from the clamp device 26 will be described with reference to the drawings. As described above, when the blade 22 is not mounted on the clamp device 26, the operation member 52 is locked in the closed position by the locking member 58 as shown in FIG. Also, as shown in FIG.
The rotation is restricted by the contact between the contact portion 33d of No. 3 and the pin contact portion 42a of the pin 42, and the pin is located at the initial position. For this reason, as shown in FIG. 11, the protrusion 33g of the sleeve 33 and the hook 52d of the operation member 52 at the initial position are arranged in a positional relationship with a gap.

When the blade 22 is mounted on the clamp device 26, a force is applied in the opening direction by operating the operation portion 52b of the operation member 52 with a finger. When a force in the opening direction is applied to the operating portion 52b, the locked state of the locking portion 52c of the operating member 52 and the locking member 58 fixed to the housing 12 is released, and the operating member 52 is moved in the opening direction. To rotate. When the operation member 52 rotates in the opening direction, the hook 5 of the operation member 52
The 2d and the protruding portion 33g of the sleeve 33 abut. Then, in a state where the hanging portion 52d and the protruding portion 33g are in contact with each other,
The operating member 52 applies a force greater than the urging force of the coil spring 44.
, The sleeve 33 rotates in the opening direction. Here, a hook portion 52e is formed on the hook portion 52d, and the projection 3
Since the hook portion 33h is formed in 3g, the sleeve 33
The contact between the hook portion 52d and the protruding portion 33g does not come off in the process of turning. When the sleeve 33 is further rotated, as shown in FIGS.
The contact portion 33e of the pin c contacts the pin contact portion 42a of the pin 42, and further rotation of the sleeve 33 is restricted. The rotational position of the sleeve 33 is a position (unlock position) where the blade 22 is attached to and detached from the clamp device 26. In a state where the sleeve 33 is located at the unlock position, the slit 33f of the sleeve 33 and the slit 37a of the rod 37 are aligned in the longitudinal direction, as is well shown in FIG. That is, the slit 33 f of the sleeve 33 is provided at both ends of the slit 37 a of the rod 37.
Is added to form a slit having a longer longitudinal length. The length of the slit formed by the rod 37 and the sleeve 33 in the longitudinal direction is equal to that of the blade 2 shown in FIG.
The second retaining projection 22b is formed to have a length slightly larger than the width 22c. Therefore, when the sleeve 33 is located at the unlock position, the blade 22 can be inserted into a slit formed by both the sleeve 33 and the rod 37. When the sleeve 33 is rotated from the initial position to the unlock position, the sleeve 3
The cam 33c formed on the cam 3 also rotates at the same time.
3c moves away from the head 42b of the pin 42. This state is shown in FIGS. When the blade 22 is inserted into the clamp device 26 in this state, the upper end surface 2 of the blade 22
2d contacts the slope 42c of the pin 42, and moves the pin 42 to the cam 33c side. When the blade 22 is further inserted, as shown in FIG.
The upper end surface 22 d of the rod 37 reaches the depth of the slit 37 a of the rod 37 while pushing up and deforming the leaf spring 62. In this state, the blade 22
The urging force of the leaf spring 62 that tries to push back is applied.

When the force applied to the operating member 52 is loosened after the blade 22 is inserted into the clamp device 26, the sleeve 33 rotates together with the operating member 52 in the initial position direction by the urging force of the coil spring 44. When the sleeve 33 rotates in the direction of the initial position, the matching sleeve 33
2 is displaced from the slit 33f of the rod 37, and as shown in FIG.
3b is brought into contact with the upper surface of the
Can not be pulled out from And sleeve 3
The cam 33c also rotates with the rotation of 3, and the cam 33c pushes the head 42b of the pin 42 toward the blade 22. Cam 33
When c pushes the pin 42 toward the blade 22, the blade 22
Is the end 42d of the pin 42 and the wall surface 37j of the slit 37a.
And fixed by being crimped. This state is shown in FIGS. Since the blade 22 is fixed in this way, the blade 22
There is no play between the clamp device 26 and the clamp device 26. For this reason, the jigsaw 10 can perform the cutting operation accurately.

As described above, the blade 22 is fixed to the clamp device 26 by being sandwiched between the end 42d of the pin 42 and the wall surface 37j of the slit 37a and pressed, so that the blade 22 having a different thickness is fixed. Can be. 7 and 8 show a state where a thin blade 22 (for example, 0.9 mm thick) is fixed, and FIGS. 9 and 10 show a state where a thick blade (for example, 1.8 mm thick) is fixed. The state is illustrated. In the state where the blade 22 is fixed, the head 42b of the pin 42 pressing the side surface of the blade 22 has a larger outer circumference of the rod 37 than the state where the sleeve 33 is located at the initial position (see FIG. 4). It is in a position protruding to the side. For this reason, the rotation of the sleeve 33 is restricted at a position where the head 42b of the pin 42 and the cam 33c of the sleeve 33 abut. Therefore, the sleeve 33 rotated in the initial position direction together with the operation member 52 is the same as that shown in FIGS.
The rotation is stopped at the position shown in FIG. 4 (FIG. 13 shows a state where the thick blade is fixed, and FIG. 14 shows a state where the thin blade is fixed). Since the operation member 52 is urged by the coil spring 54, the operation member 52 is further rotated from the position shown in FIGS. 13 and 14 to the closed position. Therefore, the sleeve 3
3 and the operating member 52 are in a non-contact state, and the clamping device 2
6 can reciprocate freely.

When the blade 22 is to be removed from the clamp device 26, the operating member 52 is operated to rotate the sleeve 33 toward the unlock position. When the sleeve 33 is rotated in the direction of the unlock position, the force of the cam 33c pushing the pin 42 is removed, and the blade is released from the locked state. When the sleeve 33 is further turned to the unlock position, the slit 33
f and the slit 37a of the rod 37 match in the longitudinal direction. Therefore, the retaining projection 22b of the blade 22 can be pulled out of the clamp device 26 through the matching slit. Further, since the urging force of the leaf spring 62 acts on the blade 22, the blade 22 is pushed out from the clamp device 26.

As is apparent from the above description, the jigsaw 10 of the present embodiment has the cam 33c formed on the sleeve 33.
The rotation of the sleeve 33 is restricted by the contact between the contact portion 33e of the sleeve 3 and the pin contact portion 42a of the pin 42.
The third slit 33f and the slit 37a of the rod 37 can be aligned in the longitudinal direction. Therefore, the sleeve 33 can be positioned at the unlocked position only by increasing the accuracy of the three members, the sleeve 33, the rod 37, and the pin 42. That is, when the sleeve 33 and the pin contact portion 42a of the pin 42 do not contact each other, a stopper for defining the open position of the operation member 52 is formed in the housing 12, and the stopper is used to position the operation member 52 at the open position. However, it is necessary to position the sleeve 33 at the unlock position by positioning the operation member 52 at the open position. In such a configuration, in order to position the sleeve 33 at the unlock position, the operation member 52 and the sleeve 3
It is necessary to improve the accuracy of the relative position of 3. However, in order to improve the accuracy of the relative position between the operation member 52 and the sleeve 33, many members (the housing 12 and the drive shaft 24 are reciprocated to determine the relative position relationship between the operation member 52 and the sleeve 33). The transmission mechanism, the operating member 52, the drive shaft 24, the clamp device 26, etc.) must be manufactured with high precision. In addition, since the sleeve 33 is urged by the coil spring 44 to push the operating member 52 back in the closed position direction, the operating member 52 is deformed unless the operating member 52 has high rigidity.
Cannot be accurately positioned in the unlock position.
In order to increase the rigidity of the operation member 52, it is necessary to increase its shape or to use a material having high rigidity, which causes an increase in cost. On the other hand, in the jigsaw 10 of the present embodiment, the sleeve 33, the rod 37, the pin 4
Since the unlock position of the sleeve 33 is determined by the three members 2, it is only necessary to increase the accuracy of these three members.

Further, in the jigsaw 10 of the present embodiment, even when the user accidentally presses the trigger switch 14 in a state where the blade 22 is not mounted on the clamp device 26, the operating member located at the closed position is provided. Since the sleeve 52 and the sleeve 33 located at the initial position are not in contact with each other, the operation member 52 and the clamp device 26 are not damaged. Furthermore, in the jigsaw 10 of the present embodiment, the operation member 5
2, the sleeve 33 can be rotated, and when the sleeve 33 is rotated to the unlock position with the blade 22 attached to the clamp device 26, the sleeve 33 is urged by the leaf spring 62 to
Is pushed out of the clamp device 26. Therefore, the blade can be attached / detached without directly touching the clamp device 26 and the blade 22 heated by the cutting heat. The operating member 52 is in the closed position in the clamp device 2.
6 are arranged. Accordingly, it is possible to prevent the jigsaw 10 from accidentally touching the clamp device 26 which is reciprocating during operation, and further prevent chips from scattering around. In addition, since the operation member is formed using a transparent material, when the user operates the jigsaw 10, the user can visually recognize the portion where the blade 22 is cutting wood or the like, and the cutting operation is easy. become.

As described above, the jigsaw according to the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment at all, and the present invention can be variously modified and improved based on the knowledge of those skilled in the art. The embodiment can be implemented.

[Brief description of the drawings]

FIG. 1 is a side view of a jigsaw according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where the blade is fixed to the clamp device.

FIG. 3 is a cross-sectional view of the same clamp device (in a state where a blade is not mounted and a sleeve is at an initial position).

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a cross-sectional view of the same clamp device (in a state where the sleeve is rotated to an unlock position).

FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5;

FIG. 7 is a cross-sectional view of the same clamp device (with a thin blade fixed).

8 is a sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is a sectional view of the same clamp device (in a state where a thick blade is fixed).

FIG. 10 is a sectional view taken along line XX of FIG. 9;

FIG. 11 is a view taken in the direction of arrow A in FIG. 1 (in a state where the operation member is turned to the closed position);

FIG. 12 is a view taken in the direction of arrow A in FIG.

FIG. 13 is a view taken in the direction of arrow A in FIG. 1 (in a state where the operating member has been rotated to a sleeve position where the thick blade is fixed).

FIG. 14 is a view taken in the direction of arrow A in FIG. 1 (in a state where the operating member has been rotated to a sleeve position where the thin blade is fixed);

FIG. 15 is a perspective view of the operation member.

FIG. 16 is an enlarged view of the XVI part in FIG. 2;

FIG. 17 is a side view of the blade.

[Explanation of symbols]

10: Jigsaw 12: Housing, 12a: Handle, 12b: Air hole, 12c: Dust collection hose mounting port, 12d: Suction port,
12e: stopper 14: trigger switch 16: power cord 18: base, 18a: lower surface of base 19: back roller 22: blade, 22a: blade, 22b: retaining projection,
22c: width, 22d: upper end surface 24: drive shaft 26: clamping device 32: chuck 33: sleeve, 33a: groove, 33b: lower end, 33c:
Cam, 33d: contact portion, 33e: contact portion, 33f: slit, 33g: protrusion, 33h: hook, 33j: hole, 3
3k: round hole 35: circlip 37: rod, 37a: slit, 37b: through hole, 3
7d: hole, 37j: wall surface, 37k: flange 39: rubber cap 42: pin, 42a: pin contact portion, 42b: head, 42
c: slope portion, 42d: end portion 43: arrow 44: coil spring, 44a: one end, 44b: other end 52: operation member, 52a: shaft hole, 52b: operation portion, 52
c: locking portion, 52d: hook portion, 52e: hook portion, 52
f: hook 53: shaft 54: coil spring 56: arrow 58: locking member, 58a: hook 62: leaf spring

Claims (2)

[Claims] 1. A jigsaw including a housing, a drive shaft, a clamp device, an operation member, and a blade, wherein the drive shaft reciprocates with respect to the housing, and wherein the clamp device includes a drive unit. A chuck attached to a tip of a shaft, and a sleeve rotatable around the chuck; the blade is removably fixed to the chuck; and the operating member rotates the sleeve to rotate the chuck. The blade is switched between an unlocked state where the blade is attached and detached and a locked state where the blade is fixed. The position of the sleeve in the unlocked state is determined by the rotation of the sleeve being restricted by the chuck. A jigsaw characterized by the following. 2. The sleeve is urged to rotate from an unlocked state to a locked state, and in a state where the blade is not mounted on the clamp device, the sleeve moves in a direction to be locked. The jigsaw according to claim 1, wherein rotation is regulated by the chuck.