Patent Publication Number: US-8522657-B2

Title: Slide-type cutting machine

Description:
TECHNICAL FIELD 
     The present invention relates to a slide-type cutting machine having a cutting section linearly move parallel to a base. 
     BACKGROUND ART 
     Cutting machines for cutting wood by rotating a blade such as a circular saw blade are known conventionally. Some of those have a slide mechanism for sliding the blade in parallel with the base, on which wood or the like is placed, so as to enable cutting of the wood even in a long cut length. 
     Patent Document 1: Japanese Patent Application Laid-open No. H11-156801 
     Patent Document 2: Japanese Patent Application Laid-open No. H09-300301 
     Patent Document 3: Japanese Patent Application Laid-open No. H07-276135 
     Patent Document 4: Japanese Patent Application Laid-open No. 2006-198868 
     Patent Document 5: Japanese Patent Application Laid-open No. H11-58302 
     The slide-type cutting machine described in the Patent Document 1 is provided with a linkage means including a first link having one end connected to a cutting section having a blade and the other end connected to a movable section, respectively, and a second link having one end connected to the first link and the other end connected to a linear guide unit. 
     In the slide-type cutting machine described in the Patent Document 1 having such structure, the cutting section including the blade moves toward one direction while being guided by the linear guide unit including the movable section, which moves toward a direction perpendicular to the above direction, and therefore the guide unit can be prevented from projecting toward the moving direction of the blade, and is suitable for cutting operation in a narrow site. 
     The slide-type cutting machine described in the Patent Document 2 has a constant load spring disposed between a cutting machine body and a worktable, and resilience of the constant load spring is used for slide operation. 
     The slide-type cutting machine described in the Patent Document 2 having such structure permits automatic return to a predetermined position by resilience of the constant load spring at the time of releasing the sliding operation in the cutting machine body. Further, since the cutting machine is operated by a constant power during the sliding operation, it is possible to carry out sliding operation to an operation start position and feeding operation during cutting work also at a constant power, improving sliding operability. 
     The slide-type cutting machine described in the Patent Document 3 includes a support member disposed to be inclinable with respect to a base portion, a shaft passing through the base portion and the support member, a cum shaft lever passing through a hole formed in the shaft, the cum shaft lever rotatably mounted to the support member, and a circular saw blade mounted to the support member by means of a circular saw blade support member, wherein an eccentric cum portion is located in the hole of the shaft and the rotating operation of the cum shaft lever is controlled beside a circular saw plate. 
     The slide-type cutting machine described in the Patent Document 3 having such structure permits easy control of the tilt angle of the circular saw blade without increasing a weight of the machine. 
     The slide-type cutting machine described in the Patent Document 4 has a carry handle provided on the blade portion. 
     The slide-type cutting machine described in the Patent Document 4 having such structure permits easy carrying with the carry handle held by hand at the time of transportation. 
     The slide-type cutting machine described in the Patent Document 5 uses a pull spring as an auxiliary power decreasing means for decreasing a high operation power to move the circular saw in the horizontal direction. Further, this machine has a damper mechanism for preventing an abrupt movement of the saw blade when the circular saw is not held by hand. 
     The slide-type cutting machine described in the Patent Document 5 having such structure permits the circular saw to be moved horizontally without requiring a great power and prevents an abrupt movement of the saw blade even when the circular saw is not held by hand in use of the slide-type cutting machine. 
     DISCLOSURE OF THE INVENTION 
     Problem to be solved by the Invention 
     According to the conventional slide-type cutting machine described above, however, in the slide-type cutting machine of the Patent Document 1, when the blade is moved to the front of an operator from a far position, the linear guide unit and the linkage means are moved downward and therefore when the operator takes off the hand from the cutting section, the cutting section is moved to the near side (operator side) by the own weight of the linear guide unit and the linkage means. Moreover, though the cutting section is provided with a guard, cut scraps or the like produced by cutting wood are stuck to a movable portion of the guard, sometimes obstructing normal operation of the guard. In such case, if the operator takes off the hand from the handle of the cutting section directly after finishing the cutting work, the cutting section would move toward the operator, inducing danger to the operator. Moreover, at the time of housing the slide-type cutting machine, it could be the most compact housing state if the blade is located at a far position from the operator (linear guide unit side). However, in the cutting machine of the Patent Document 1, if the cutting section is moved to such a position far from the operator, the linear guide unit is projected upward and therefore housing the cutting machine needs a large space. Moreover, in the slide-type cutting machine of the patent Document 2, since the slide mechanism is forced by a spiral load spring, an additional member to drive the cutting machine is needed, thus increasing cost and troublesome assembling operation. 
     According to the above structure of the conventional slide type cutting machine, in the slide-type cutting machine of the Patent Document 1, since the linear guide unit and the linkage means are located rearward of the blade, when the cutting section is located at a position near the linear guide unit, the linear guide unit is projected upward and overlaps with the cutting section. This location causes a problem in disposition of a dust collector. Moreover, in the slide-type cutting machine of the Patent Document 1, since the tilt angle of the cutting section is fixed, the blade cannot be tilted against the work plane on which a workpiece is placed and therefore the workpiece cannot be cut with a desired angle. Moreover, in the slide-type cutting machine of the Patent Document 3, since the support member on which a tilting position controlling mechanism and a tilting stopper are disposed is substantially circular-shaped and therefore some size of space is needed to dispose such tilting mechanism, causing problem in decreasing the size of the slide type cutting machine. 
     According to the above structure of the conventional slide type cutting machine, in the slide-type cutting machine of the Patent Document 1, the slide-type cutting machine cannot be held in a good state when it is transported, involving great problem in transporting the machine. In addition, since the cutting machine of the Patent Document 1 does not have the tilting mechanism, the blade cannot be tilted to cut the workpiece obliquely. In the slide-type cutting machine of the Patent Document 4, the carry handle is mounted to the saw portion. At the time of carrying the slide-type cutting machine by holding the handle, both a slide mechanism for horizontally moving the saw portion and a swing mechanism for vertically moving the saw portion have to be fixed, involving troublesome preparation before carrying the cutting machine. 
     Moreover, according to the above structure of the conventional slide type cutting machine, in the cutting machine of Patent Document 1, a stopper S as a rod-shape member is used to halt the movement of the linear guide unit for the link not to be moved at the time of housing the cutting machine. More specifically, the linear guide unit includes the fix portion and the movable portion, the movement of which is fixed by using the stopper S so that the linear distance between the fix portion and the movable portion becomes the greatest. As having such structure, the stopper S becomes long, involving troublesome operation at the time of securing the linear guide unit. 
     Moreover, as mentioned above, the stopper S has such a long shape, involving a problem of how and where the stopper S is safe-kept when it is not in use, in other words, when the slide-type cutting machine is in use. 
     Moreover, according to the above structure of the conventional slide type cutting machine, in the cutting machine of Patent Document 1, the linear guide unit (slide shaft) and the linkage means (link) are moved downward when the saw portion is moved from the far position toward the near position of the operator. The linear guide unit (slide shaft) and the linkage means (link) have a heavy weight and when the operator takes off the hand from the cutting machine, the saw portion is moved nearer in front of the operator. Therefore, at the instant when the operator takes off the hand from the handle after finishing cut operation of wood piece, sometimes suddenly the saw portion runs close to the operator. 
     Moreover, in the cutting machine of the Patent Document 5, since the cutting machine needs the tensile spring as an operation power reducing means to assist the circular saw to move in the horizontal direction, involving problems of a high parts count, troublesome assembling operation, cost reduction and so on. 
     It is therefore an object of the invention to overcome the above problems and provide any of the slide-type cutting machines, which are: 
     a slide-type cutting machine that ensures safer operation for cutting wood or the like and permits compact housing thereof; 
     a slide-type cutting machine that enables efficient collection of cut scraps or the like scattered from workpiece during working operation, has a dust collector disposed not to interfere with a linear guide unit and a linkage means when the cutting section is sliding, and makes it possible to cut the workpiece with a desired cut angle without increasing the size of the slide-type cutting machine itself; 
     a slide-type cutting machine that is easily carried with a small number of securing positions and makes it possible to tilt the blade section to perform slant cutting; 
     a slide-type cutting machine that makes it possible to easily fix the linear guide unit when the cutting machine is housed and is designed not to lose the stopper; and 
     a slide-type cutting machine that is comprised of a low parts count and prevents the main body and the saw blade from an abrupt movement even when the operator takes off hand from the handle during the operation. 
     Means for solving the Problem 
     The invention is described below. To be noted, although the reference numbers in the accompanying drawings are added in the description for easier understanding of the invention, the invention is not restricted by the embodiments shown in the drawings. 
     A slide-type cutting machine  1  according to the invention includes: a base  2  having a plane  21  on which a workpiece is placed; a linear guide unit  3  mounted to the base  2 ; and a linkage means  5  mounted to a cutting section  4  having a blade  41   a , wherein the linear guide unit  3  and the linkage means  5  constitute a Scott-Russell mechanism in cooperation with each other and guide a linear movement of the cutting section  4 . The slide-type cutting machine is characterized in that the linear guide unit  3  includes a slide shaft  33  that moves in a direction perpendicular to the moving direction of the cutting section  4 , a first slide holder  31  for guiding the movement of the slide shaft  33 , and a second slide holder  34  located at a lower end of the slide shaft  33  and for restricting the movement of the slide shat  33  by abutting against the first slide holder  31 , and the linkage means  5  includes a first link  51  and a second link, the first link having one end connected to the cutting section  4  and the other end connected to the second slide holder  34 , the second link  52  having one end connected to the first slide holder  31  and the other end connected to the first link  51 . 
     Further, the slide-type cutting machine  1  of the invention may include an auxiliary link  53  having one end connected to the cutting section  4  and the other end connected to the second slide holder  34 . 
     Further, the slide-type cutting machine  1  of the invention may include a slide stopper  35  disposed on the upper end of the slide shaft  33  and for restricting the movement of the slide shaft  33  by abutting against the first slide holder  31 . 
     Further, in the slide-type cutting machine  1  of the invention, at least one of the linear guide unit  3  and the linkage means  5  may be located at a offset position vertically off from a plane including a rotation plane of the blade  41   a.    
     Further, in the slide-type cutting machine  1  of the invention, the linear guide unit  3  and the linkage means  5  may be disposed so as not to intersect the center axis of a dust collector  44  mounted to the cutting section  4 . 
     Further, in the slide-type cutting machine  1  of the invention, the cutting section  4  may include a blade section  41  having the blade  41   a  and a holding section  42  that connects the blade section  41  to the linkage means  5 , and the holding section  42  may be provided with a carry handle  43 . 
     Further, in the slide-type cutting machine  1  of the invention, the cutting section  4  may be secured to the linear guide unit  3 . 
     Further, in the slide-type cutting machine  1  of the invention, a second cutting section fixing portion  32  provided on the linear guide unit  3  and a first cutting section fixing portion  46  provided at the cutting section  4  may be fixed by means of a fixing member  32   a  to halt the movement of the cutting section  4 . 
     Further, in the slide-type cutting machine  1  of the invention, the fixing member  32   a  may be secured to the linear guide unit  3  not to be detachable. 
     Further, the slide-type cutting machine  1  of the invention may be provided with a plurality of links ( 51 ,  52 ,  53 ) including the second link  52 , one end of which is connected to the first slide holder  31  and the other end of which is connected to the second link  51 , and the plurality of links  51 ,  52 ,  53  have a link hole  54  and are connected to each other with a shaft  56  passing through the link hole  54 , and at least one of the plurality of links  51 ,  52 ,  53  may be provided on its inner periphery with a rotation control member  57  that is forced to the radial direction of the shaft  56 . 
     Further, in the slide-type cutting machine  1  of the invention, the rotation control member  57  may be formed of silicon rubber. 
     Further, in the slide-type cutting machine  1  of the invention, the rotation control member  57  may be forced by an elastic body  57   a.    
     Effect Of The Invention 
     According to the slide-type cutting machine of the invention, since the second holder disposed at the lower end of the slide shaft and the linkage means are linked to each other, when the operator takes off the hand from the handle after cutting operation, the slide shaft and the second slide holder move downward by own weight thereof. Then, ganged with the movement of the slide shaft and the second slide holder, the linkage means causes the cutting section to move to the side of the linear guide unit, namely, the cutting section does not move toward the operator, thus ensuring safety of the operator in cutting wood or the like. Furthermore, in the slide-type cutting machine of the invention, as mentioned above, the cutting section is stationed naturally at a position near side of the linear guide unit after moving there and in this condition, the slide shaft, which serves as the linear guide unit, projects downward. Therefore, it is possible to house the cutting machine without requiring a large space. 
     Further, since the slide-type cutting machine of the invention is provided with an auxiliary link having one end connected to the cutting section and the other end connected to the second slide holder, it is possible to prevent the cut section from rotating around the connecting portion between the first link and the cut section as a pivot, thus ensuring horizontally the linear movement of the cut section. 
     Furthermore, since the cutting machine of the invention has the slide stopper mounted to the upper end of the slide shaft so as to restrict the movement of the slide shaft by abutting against the first slide holder, it is possible to prevent the slide shaft from falling from the first slide holder when the cutting section moves to the side of the linear guide unit. 
     Still further, since at least one of the linear guide unit and the linkage means is vertically offset from a plane extending from a rotation plane of the blade, it is possible to prevent the linear guide unit and the linkage means from interfering with the dust collector if the linear guide unit projects upward. In addition, since the dust collector may be located at the rear of the cutting section, efficient dust collection can be ensured. Also, decreasing the size of the cutting machine can be attained. 
     Still furthermore, since the carry handle is secured to the holding section, which includes the cutting section to be guided by the Scott Russell mechanism, it is possible to carry the slide-type cutting machine without fixing the swing mechanism for vertically moving the blade section. 
     Still furthermore, since the link can be fixed at such a position that the linear distance between the linear guide unit and the cutting section becomes minimum, the housing state of the slide-type cutting machine can be improved with its housing space reduced. In addition, since the linear guide unit is secured using the fixing member, the fixing means can be minimized. Further, since the fixing member is mounted to the linear guide unit not to be detached, it is not necessary to take into consideration a housing spot and a housing manner for the fixing member not to be lost in use of the slide-type cutting machine. 
     Still furthermore, since the linkage means comprising the Scott Russell mechanism is provided with the rotation control member, it is possible to prevent an abrupt action of the linkage means, thus providing a safe slide-type cutting machine without a sudden movement of the cutting section toward the operator when the operator takes off the hand from the handle. 
     Still furthermore, since in the slide-type cutting machine of the invention, the rotation control member is mounted in a forced fashion between the link and the shaft, it is possible to constitute the rotation control mechanism by a low parts counts. 
     Still furthermore, since in the slide-type cutting machine of the invention, the rotation control member is forced using an elastic body, a power to control the rotation of the shaft can be easily changed by changing an elastic constant of the elastic body. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a side view showing the whole structure of the slide-type cutting machine. 
         FIG. 2  is a side view showing a state in which the cutting section is moved to the operator&#39;s side. 
         FIG. 3  is an enlarged view showing the linkage means of the slide-type cutting machine. 
         FIG. 4  is a top view of the whole structure of the slide-type cutting machine. 
         FIG. 5  is a back view showing a tilt mechanism of the linear guide unit of the slide-type cutting machine. 
         FIG. 6  is a section view taken along the line A-A in  FIG. 1 . 
     
    
    
     EXPLANATION OF REFERENCE NUMERALS 
       1 : slide-type cutting machine,  2 : base,  3 : linear guide unit,  4 : cutting section,  5 : linkage means,  6 : tilt mechanism,  21 : work plane on which workpiece is placed,  31 : first slide holder,  33 : slide shaft,  34 : second slide holder,  41 : blade portion,  41   a : blade,  41   b : fixing bolt,  41   c : handle,  41   d : switch,  41   e : blade surface,  42 : holding section,  43 : carry handle,  44 : dust collector,  51 : first link,  52 : second link,  54 : link hole,  53   a : recess portion,  55   a : reinforce portion,  56 : shaft,  57 : rotation control member,  57   a : spring,  57   b : adjustment screw 
     BEST MODE FOR CARRYING OUT THE INVENTION 
     Best modes for carrying out the invention are described below with reference to the drawings. To be noted, the embodiments below do not necessarily restrict the invention according the respective claims and do not necessarily require, as the means of solution, the combinations of the characteristics described in the embodiments. 
       FIG. 1  is a side view showing the whole structure of the slide-type cutting machine.  FIG. 2  is a side view showing a state in which the cutting section is moved to the operator&#39;s side.  FIG. 3  is an enlarged view showing the linkage means of the slide-type cutting machine.  FIG. 4  is a top view of the whole structure of the slide-type cutting machine.  FIG. 5  is a back view showing a tilt mechanism of the linear guide unit of the slide-type cutting machine.  FIG. 6  is a section view taken along the line A-A in  FIG. 1 . 
     Incidentally, for easier explanation, the right side of the drawings  FIGS. 1 and 2  indicates the front of the cutting machine and the left side indicates the rear of the cutting machine. In the description below, the inner structure of the cutting section is identical with that of a general slide-type cutting machine and therefore only a simple description is given here. 
     The slide-type cutting machine shown in  FIG. 1  comprises a base  2  provided with a plane  21  on which a workpiece such as wood is placed, a linear guide unit  3  mounted to the rearward of the base  2 , a linkage means  5  including a Scott Russell mechanism which connects the linear guide unit  3  and a cutting section  4 , and the cutting section  4  including a blade  41   a.    
     As shown in  FIG. 4 , the cutting section  4  has a housing in a confronted fashion so as to include a driving member such as a motor therein. Further, as shown in  FIG. 1 , the cutting section  4  includes a blade portion  41  having a blade  41   a  secured thereto and a holding portion  42  secured to the rearward of the blade portion  41  through a swing shaft  47  so as to allow the blade  41   a  to swing around a swing shaft  47  as a pivot. Incidentally, as shown in  FIGS. 3 and 4 , such swing mechanism for vertically swinging the blade  41   a  around the swing shaft  47  as a pivot can be fixed by a swing stopper  48   a , which is secured to the holding portion  42  not to be detached, in a manner that the swing stopper  48   a  is inserted through a swing fixing hole  48  formed in the holding portion  42  and through a blade portion fixing hole  49  formed in the blade portion  41 . In addition, the blade portion  41  has a handle  41   c  for the operator to hold the cutting machine to make the cutting section  4  linearly move back and forth while he cuts and works a workpiece. Further, the handle  41   c  has a switch  41   d . While holding the handle  41   c , the operator presses the switch  41   d  to actuate the motor linked to the blade  41   a , thus performing the cut and work operation. 
     The blade  41   a  is secured to the blade portion  41  by means of a fixing bolt  41   b . The operator may select a blade suitable for the type of workpiece by removing and mounting the fixing bolt  41   b . In the like manner, a worn blade  41   a  can be easily replaced with a new one by removing and securing the fixing bolt  41   b.    
     Further, at the rear side of the blade portion  41  is located a dust collecting tube  44 , an open end of which may be provided with a dust collecting bag so as to collect cut scraps and the like produced due to cutting workpiece. Here, as shown in  FIGS. 1 and 4 , since the center axis of the dust collecting pipe  44  is directed along the tangential line of the blade  41   a , the cut scraps or the like scattered due to rotation of the blade  41   a  can be efficiently collected. With an additional member like a sucking device mounted to the dust collector  44 , the dust-collecting action could be enhanced. 
     At the upper side of the holding portion  42  is located a carry handle  43 . When carrying the slide-type cutting machine  1  of this embodiment, the operator can easily carry the cutting machine by holding the carry handle  43 . 
     The rear of the carry handle  43  is provided with a first cutting section fixing hole  46 . The position of the holding portion  42  (cutting section  4 ) can be fixed on the side of the linear guide unit  3  in the manner that a fixing pin  32   a  is inserted through the first cutting section fixing hole  46  and through a second cutting section fixing hole  32  formed in the first slide holder  31 , so that the slide mechanism of the cutting section can be fixed. Incidentally, as shown in  FIG. 4 , a stopper ring  32   b  is secured to the fixing pin  32   a . By the engagement of the stopper ring  32   b  with the linear guide unit  3 , the fixing pin  32   a  is secured not to be removable from the first slide holder  31  and not to drop off from the second cutting portion fixing hole  32 . Thus, it is unnecessary to take account of accommodation of the fixing pin  32   a  in a case when the cutting machine is not fixed, and it is possible to prevent the fixing pin  32   a  from missing. 
     At the time of carrying the slide-type cutting machine  1  of the invention, it is possible to safely carry the slide-type cutting machine  1  by holding the carry handle  43  without fixing the blade portion  41  by the swing stopper  48   a  because the carry handle  43  can be fixed with regard to the base  2  in the manner that the cutting unit  4  is fixed using the fixing pin  32   a  as mentioned above. 
     Next, the linear guide unit  3  is described with reference to the drawings  FIGS. 1 to 3 . 
     As shown in  FIG. 1 , the linear guide unit  3  includes a slide shaft  33 , the first slide holder  31  provided with a sliding hole  31   a , through which the slide shaft  33  is slidably inserted, and a second slide holder  34  located at the lower end of the slide shaft  33 . 
     As shown in  FIG. 3 , the first slide holder  31  is provided with a slide hole  31   a , through which the slide shaft  33  is slidably inserted, and mounted to the rear end of the base  2  to be inclinable. The first slide holder  31  is also provided with a first slide holder link hole  31   b  to rotatably secure a second link  52  so that the first slide holder link hole  31   b  accepts one end of the second link  52 . 
     The slide shaft  33  has a rod shape and is inserted in the slide hole  31   a  slidably in a direction perpendicular to the moving direction of the cutting section  4 . Further, at the lower end of the slide shaft  33  is located a second slide holder  34 . The slide holder  33  is fixed to the second slide holder  34  with the lower end thereof pressed into the second slide holder. The second slide holder  34  moves upward together with the slide shaft  33  and as shown in  FIG. 2 , the upward movement of the slide shaft  33  is restricted by the abutment of the lower end of the first slide holder  31  against the upper end of the second slide holder  34 . 
     The upper end of the peripheral surface of the slide shaft  33  may be formed with a chamfering portion extending in the axial direction of the slide shaft, and a profile of the slide hole  31   a  may have almost a shape of ‘D’ in order to correspond to the chamfering portion. With such formation of the slide shaft  33  and the slide hole  31   a , easy positioning of the slide shaft  33  is possible at the time of inserting the slide shaft  33  into the slide hole  31   a . Also, at the time of assembling the linkage means  5  described later, easy and accurate alignment of those members is possible. 
     In addition, the lower end of the peripheral surface of the slide shaft  33  may also be formed with a chamfering portion extending in the axial direction of the slide shaft, and the second slide holder  34  may be provided with a press-fit hole having a shape of ‘D’ in order to correspond to the chamfering portion of the lower end of the slide shaft  33 . With such formation of the slide shaft  33  and the press-fit hole, easy positioning of the slide shaft  33  is possible at the time of press-fitting the slide shaft  33  into the second slide holder, and at the time of assembling the linkage means  5  described later, easy and accurate alignment of those members is possible. 
     At the upper end of the slide shaft  33  is located a stopper  35  and as shown in  FIG. 1 , the downward movement of the slide shaft  33  is restricted by the abutment of the upper end of the first slide holder  31  against the stopper  35 . 
     The second slide holder  34  is provided with a second slide holder link hole  34   a  for securing a first link  51  and a second slide holder auxiliary link hole  34   b  for securing an auxiliary link  53 . The first link  51  and the auxiliary link  53  are rotatably connected to the second slide holder link hole  34   a  and to the second slide holder auxiliary link hole  34   b , respectively. 
     Next, the linkage means  5  is described with reference to  FIG. 3 . 
     The linkage means  5  includes the first link  51 , the second link  52  and the auxiliary link  53 . The first link  51  has one end rotatably connected to a first holding section link hole  45   a  formed in a holding section  42  and the other end rotatably connected to the second slide holder link hole  34   a  formed in the second holder  34 . The second link  52  has one end rotatably connected to the slide holder link hole  31   b  formed in the first slide holder  31  and the other end rotatably connected to a link connection hole  55  formed in the first link  51 . The auxiliary link  53  has one end rotatably connected to a second holding section link hole  45   b  formed in the holding section  42  and the other end rotatably connected to the second slide holder auxiliary link hole  34   b  formed in the second slide holder  34 , and the auxiliary link  53  is disposed parallel with the first link  51 . 
     Next, connecting manners of the links are described with reference to  FIG. 6 . As the connecting manners of the first link  51 , the second link  52 , and the auxiliary link  53  are identical, the connecting manner of the auxiliary link  53  is described as an example. 
     The auxiliary link  53  is provided with a link hole  54 , and a shaft  56  is inserted in the link hole  54  and a holding section link hole  45   b  to be secured by bolt fixing. 
     A rotating portion of the auxiliary link  53  having the shaft  56  as a rotation axis is provided with a bearing  58  for reducing a rotating friction. The bearings  58 ,  58  are fastened by a shaft fixing bolt  56   b  using a shaft head  56   a  and a washer  56   c . By pushing a ball (not shown) in the bearing  58  to one of the longitudinal directions of the shaft  56 , the bearing is free of axial play, preventing backlash. The link hole  54  is provided on its inner periphery with a rotation control member  57  forced to the radial direction of the shaft  56 . The rotation control member  57  is formed of silicone rubber, and forced to the radial direction of the shaft  56  by a spring  57   a  as an elastic body. Since the force applied by the spring  57   a  can be controlled by fastening an adjustment screw  57   b , the rotation controlling power can be controlled by adjusting the frictional resistance between the rotation control member  57  and the shaft  56 . Since the rotation control member  57  prevents the auxiliary link  53  from abruptly rotating around the shaft  56  as the rotation axis, it is possible to prevent the cutting section  4  from abruptly running when the operator takes off the hand from the cutting section. 
     To be noted, the rotation control member  57  may be well if it is provided at least at one of the links, in other words, all the links are not necessarily provided with the rotation control member. 
     Further, a shaft fixing screw  56   d  is secured to the holding section link hole  45   b  formed in the holding section  42  so as to abut against the shaft  56 , preventing a radial backlash of the shaft  56  and the holding section  42 . Being free of radial backlash of the shaft  56  and the holding section  42 , and free of radial backlash of the bearing between the shaft  56  and the auxiliary link  53 , high accurate movement of the auxiliary link  53  is possible. 
     The linkage means  5  constitutes the Scott Russell mechanism in cooperation with the linear guide unit  3 . The cutting section  4  can move linearly without swinging vertically owing to the linkage means  5 . 
     Further, the side face of the first link  51  is provided with a reinforcement portion  55   a  for increasing rigidity of a link connection hole  55 . 
     The auxiliary link  53  serves to allow the cutting section  4  to keep its posture while moving linearly. The upper end face of the auxiliary link  53  is provided with a recess portion  53   a  so as not to come in contact with the reinforcement portion  55   a  formed in the first link  51 . 
     With such structure of the slide-type cutting machine  1 , as shown in  FIGS. 1 and 2 , the cutting section  4  can be moved linearly with regard to the base  2 , from a natural state as shown in  FIG. 1 , till a state in which the slide shaft  33  is moved to the upward position and the linkage means  5  is stretched out, as shown in  FIG. 2 . 
     Next, manner of securing the linear guide unit  3  to the base  2  is described with reference to  FIG. 5 . 
     As shown in  FIG. 5 , the linear guide unit  5  is mounted to the base to be rotated around the bolt  37  as a rotation axis. Namely, the linear guide unit  5  is secured to the base  2 , with a securing arm  36  extending downward from the lower end of the first slide holder  31  secured to the base  2  by fastening a pin  62 . 
     Further, a securing portion of the linear guide unit  3  is provided with the tilting mechanism  6 . The tilting mechanism  6  includes a tilting plate  60  located at a tip of the securing arm  36 , an arc-shaped groove  61  formed in the tilting plate  60 , and the pin  62  engaged with the inner periphery of the arc-shaped groove  61 . Fastening the pin  62  allows the tilting plate  60  to be fixed to the base  2  through an operation of rotating a knob  65  linked with the pin  62 . 
     The linear guide unit  3  rotates around the bolt  37  as the center and the pin  62  engaged with the inner periphery of the arc-shaped groove  61  restricts a rotation range of the linear guide unit  3 . The operator may tilt the linear guide unit  3  to a desirable tilt position, and then rotate the knob  65  to fasten the pin  62 , thus allowing the linear guide unit  3  to be fixed at the desirable tilt angle. 
     The tilting plate  60  is provided with adjustment bolts  63   a  and  63   b , and the base  2  is provided with a stopper  64 . The stopper  64  and the adjustment bolt  63   a  abut against each other to make the linear guide unit  3  vertically stand on the base  2 , and the stopper  64  and the adjustment bolt  63   b  restrict a tilt range of the tilting plate  60 . By adjusting the adjustment bolts  63   a  and  63   b , the degree of verticality of the linear guide unit  3  with respect to the base  2  can be controlled and the tilt range of the tilting mechanism  6  can be controlled within the range of the groove  61 . 
     The tilting mechanism  6  allows the linear guide unit  3  to tilt at a predetermined angle α with respect to the base  2 . Tilting of the linear guide unit  3  allows the cutting section  4 , which is connected with the linear guide unit  3  through the linkage means, to be tilted, thus allowing a workpiece to be cut slantwise with respect to the work plane  21 . In this embodiment, the linear guide unit  3  is designed to tilt at an angle in the range of 45° to 90°. 
     As mentioned above, since the linear guide unit  3  is secured to the base  2  through the tilting mechanism  6 , the cutting section  4  can be tilted and fixed at an angle in a predetermined range with respect to the work plane  21 , on which a workpiece is placed. Thus, the workpiece can be cut at a desirable angle. Further, since the tilting plate  60  is substantially fan-shaped, the tilting plat  60  does not interfere with the linear guide unit  3 . Also, since the linear guide unit  3  can be located laterally to the tilting plate  60 , decreasing the size of the slide-type cutting machine  1 . 
     Further, as shown in  FIG. 5 , the linear guide unit  3  and the linkage means  5  are located at an offset position vertically off from a plane including a blade plane  41   e  as a rotating plane of the blade  41   a  by an offset of β. With such arrangement of the linear guide unit  3  and the linkage means  5  vertically offset from the plane including the blade plane  41   e , the size of the slide-type cutting machine  1  can be decreased, the center axis of the dust collecting tube  44  on a plane substantially flush with the plane including the blade plane  41   e  dose not intersect the linear guide unit  3  or the linkage means  5 , and a dust-collecting bag to be mounted to the open end of the dust collecting tube  44  does not obstruct the movement of the cutting section and the action of the linear guide unit  3  and the linkage means  5 , thus permitting smooth movement of the cutting section  4 . In addition, since the dust collecting tube  44  is located on the rearward side of the blade section  41 , at the offset position free from interfering with the linkage means  5  and the holding section  42 , the size of the slide-type cutting machine  1  can be decreased particularly in the fore-and-aft direction. While, in this embodiment, the linear guide unit  3  and the linkage means  5  are vertically offset from the plane including the blade plane  41   e  as the rotating plane of the blade  41   a  by the offset of β, one of the linear guide unit  3  and the linkage means  5  may be located at the offset position vertically off from the plane including the blade plane  41   e  as the rotating plane of the blade  41   a.    
     To be noted, the present invention is not necessarily limited to the above embodiment but may be carried out in various manners of embodiment. While, in this embodiment, one example where the auxiliary link is located at the lower side of the first link is described, the auxiliary link may well be located at the upper side of the first link. Also, while one example of fixing the holding section in which the holding section and the first slide holder are engaged with each other is described, the slide shaft and the first slide holder may well be fixed to each other. Further, while, in this embodiment, an embodiment where the rotation control member is mounted to the auxiliary link is described, the rotation control member may well be mounted to the first link and may also be mounted to the second link. Further, the rotation control member is not necessarily provided to one spot but also may be provided to two or more spots of the links. Furthermore, the embodiment in which the rotation control member is forced by a spring is described, the rotation control member may well be formed of a material having elasticity so as to be forced by resilience of the elastic material.