JP3057034U - Electric lift - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To lift the table up and down by simply vertically sliding the table with respect to the base without a pantograph, and to move the table up and down without rotating the motor in a circular motion without a ball screw.
An electric table lift device with a small head up to about 0 mm. A table (2) having a vertical slider in which a pair of side plate rails (5) vertically provided on the back surface of the table and a pair of angled guides (8) provided with a cam follower (9) are vertically installed such that the apexes of the members face each other. A base 3 having a pair of chevron rails 10 fixed vertically at the front and rear ends so that the vertices are outwardly facing each other, and a rotary arm 12 having a support roller 11 rotatably pivotally fixed to each end. The plurality of rotating shafts 13 and the supporting roller 11
And a connection drive mechanism 15 for maintaining and rotating the rotary arm 12 so that the upper surface thereof is horizontal.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an electric table lift apparatus having a simple mechanism without a pantograph and having a small head up to about 100 millimeters, which is used for raising and lowering various loads in a factory or the like.

[0002]

[Prior art]

 Conventionally, this type of electric table lift device has a structure like a screw type electric table lift 30 in FIG. 14 as described in, for example, Japanese Patent Application Laid-Open No. 6-9193. This has a pantograph in which an outer arm 28 and an inner arm 29 are connected in an X-shape between a table 26 and a base 27, and has a screw shaft 33 as a drive source for expanding and contracting the pantograph. Was. Here, the screw shafts of electric table lifts that are usually commercially available often have a ball screw as a main component. Further, as a conventional technique which is even earlier than the screw type electric table lift, a hydraulic cylinder is used as a driving source for expanding and contracting a pantograph in most cases as disclosed in Japanese Patent Publication No. 59-41920, for example. Was. Comparing the screw-type electric lift with the hydraulic table lift, the former has no drawbacks due to the latter, such as oil leakage and oil leakage, but the drive 32 from the motor 31 to the arms 28, 29 via the screw shaft 33. However, they have the disadvantage that they are complex as shown, for example, in FIG. 15 and are generally more expensive than the latter. Also, among the electric or hydraulic lifts incorporated in conveyor lines, etc., there is an X-shaped pantograph with a lifting range of up to about 100 mm, which has a leg opening capacity up to about 45 mm. Since the pantograph is used near the folded state, the pantograph cannot be fully utilized and the economic efficiency is low. In addition, the screw mechanism as a drive source for expanding and contracting the pantograph also had the disadvantage that most of the mechanisms that would be expensive even if the lift was small had to be used as they were, resulting in poor economic efficiency. In addition, hydraulic lifts with small heads have disadvantages caused by oil odor emission and oil leakage, etc.In addition, since the hydraulic cylinder of the drive source is used at a gentle inclination angle almost close to the lying state, the component of the force in the upward direction is low. There was a disadvantage that the mechanical efficiency was small.

[0003]

[Problems to be solved by the invention]

 There is a demand for an inexpensive electric lift that does not use a pantograph or a screw mechanism for a small-lift electric lift having a head up to about 100 mm. The function of the conventional pantograph is to translate the table perpendicular to the base, and the function of the screw is to change the rotational motion of the motor to linear motion once and raise and lower the table via a pantograph. . One of the problems of the present invention is to design a simple slide mechanism that allows the table to move parallel to the base only in the vertical direction without a pantograph, and the problem 2 is to convert the rotational motion of the motor into a linear motion. The purpose of the present invention is to provide a drive mechanism that directly raises and lowers the table without using a pantograph by means of a rotating mechanism that moves in an arc without conversion, and to provide a simple electric lift with a small head by combining the drive mechanisms. .

[0004]

[Means for Solving the Problems]

 As a condition for a simple table vertical slide mechanism, a method that can regulate front-back, left-right, and right-and-left movement only by arranging regulating members at both ends in the longitudinal direction of the base and that does not require processing accuracy became a specific issue. . Instead of the front-rear, left-right control, it was the same even if the movement in the two orthogonal directions rotated by 45 ° in the horizontal plane was the same, and the equilateral angle iron was erected at each of the front and rear parts on the base line of the base. Are arranged outward so that the two sides form a rail surface in a 45 ° direction. A slightly larger equilateral angle iron, which serves as a slider for fixing the lower surface of the table, is arranged inside each of the rails so that the sides are perpendicular to the sides of the rails. The movement in the horizontal plane was regulated by holding the robot in both directions. In addition, a slight gap is provided between the rail and the roller to solve a simple vertical slide mechanism that does not require strict machining accuracy. As a driving means for pushing up the table by turning, the table is pushed up by the circular motion of the support rollers provided at the tips of the four sets of rotary arms which are turned synchronously. The rotary arm is fixed to both ends of two sets of parallel rotation shafts supported on a base and driven by an electric motor. When the support roller directly presses the lower surface of the table, it is good if the support roller moves on the orbit of the upper half of the rotation axis that is the center of arm rotation, but if the lower half revolves, the support roller and the table collide. In order to solve this problem, the table was raised by attaching edges higher than the radius of rotation of the rotary arm to both ends of the table, and the support rollers pushed up the lower surface of the edge. A horizontal roller rolling guide surface is provided on the lower surface of the edge so that the table follows only the vertical component of the circular motion of the roller and slides horizontally. Further, as an additional means, in order to meet the demand for tables of various sizes, an enlarged table of various sizes is mounted on the same basic unit table. If an oversized table is used, an eccentric load is applied to the end of the table, causing the table to tip over. To prevent this, a reversal prevention guide that contacts the lower surface of the roller was provided.

[0005]

[Embodiment of the invention]

 It has a generally rectangular table 2 on which an object to be lifted is mounted and a fixed base 3, a lifting device 4 is interposed between the table 2 and the base 3, and a vertical slider 7 attached to the table 2. The cam follower 9 and the chevron rail 10 are fitted to each other to restrict the movement of the table 2 in two diagonal directions of 45 ° in the horizontal plane, and to allow the table 2 to slide only in the vertical direction. A table lift device 1 having a small head with a head height of about 100 mm, which raises the horizontal rolling guide surface 6 of the side plate rail 5 by the revolution of 11 and moves the table 2 up and down. The table 2 has a pair of side plate rails 5 which are provided at both edges of the back surface and have horizontal rolling guide surfaces 6 on the lower surface, and a pair of angled guides 8 provided with cam followers 9 on both sides with respect to the center line of the table. It has a vertical slider 7 disposed so as to face each other so that the vertices 21 of both sides are inwardly inward and bisecting the internal angle at 45 °, and are vertically suspended substantially at the front and rear ends of the table. The base 3 has a pair of chevron rails 10 which engage with the vertical slider 7 at the front and rear ends thereof so that the apexes 22 face each other outward, and both sides form a sliding surface orthogonal to each other in a 45 ° direction. And fix it vertically. Further, it has a mount 35 for the lifting device 4. The lifting device 4 has a plurality of rotating shafts 13 supported by the base 3 and a motor 14 provided in parallel in the width direction. A rotary arm 12 is fixed to both ends of each rotating shaft 13 in the same posture, and a support roller 11 is rotatably connected to a tip of the rotary arm 12 so as to be rotatable. At this time, the height of the support center of the rotary shaft 13 and the height of the side plate rail 5 are set to a height at which the support roller 11 can revolve. A gear train or a chain transmission or a link mechanism is used to form the motor 14 and the motor 14 in such a manner that the attitude of the rotary arm 12 is such that the upper surfaces of all the bearing rollers 11 are always horizontal with respect to a certain rotation angle of the motor 14. It has a drive connection mechanism 15 for connecting between the rotating shafts 13.

[0006]

【Example】

 Next, an embodiment of the present invention (hereinafter referred to as "the present embodiment") will be described with reference to FIGS. FIG. 1 is a front view of the table lift device 1 of the present example at a position where the lifting and lowering is substantially in the middle. In FIG. 1, a table lift apparatus 1 has a table 2 having a generally rectangular table surface for loading an object to be lifted and a fixed base 3, and a table 3 between the table 2 and the base 3 is shown in FIG. The lifting device 4 is interposed. Further, the cam follower 9 of the vertical slider 7 attached to the table 2 shown in FIG. 4 and the chevron rail 10 attached to the base 3 shown in FIG. 5 are fitted together as shown in FIG. 2 which is a plan view of this example. The movement of the table 2 in two directions at an angle of 45 ° in the horizontal plane is restricted so that it can slide only in the vertical direction. With this structure, the horizontal rolling guide surface 6 of the side plate rail 5 shown in FIGS. 1 and 3 is pushed up by the revolution of the bearing roller 11 of the lifting device 4 shown in FIG. 6, and the table 2 is moved up and down.

The table 2 will be described in detail with reference to FIGS. 1 and 2, FIG. 3 which is a side view of the present embodiment, and FIG. 4 which is a side view of the table 2 alone. The table 2 has a pair of side plate rails 5 that are vertically downwardly provided on both longitudinal edges of the table back surface, that is, on the lower surfaces of both long sides, and the lower surfaces of both side plate rails 5 are the same. A horizontal rolling guide surface 6 of a height is formed. The table 2 has a pair of chevron guides 8 formed by suspending equilateral angle steel at substantially the front and rear edges of the back surface of the table, that is, on the lower surfaces of both short sides as shown in FIG. A pair of cam followers 9 are provided to form a vertical slider 7 as shown in FIG.

[0008] The arrangement and structure of the vertical slider 7 will be described with reference to FIG. At the front and rear ends in the longitudinal direction of the table 2 represented by the virtual lines in this example, and on the approximate center line of the width, two angled guides 8 are placed so that the vertices 21 face each other and both sides are turned inward. Is erected on the back surface of the table 2 such that is at a 45 ° symmetrical angle with respect to the center line. A pair of cam followers 9 are provided at both ends of each chevron guide 8 and at positions equidistant from the apex 21 so as to be orthogonal to the sides. The two chevron guides 8 and the four cam followers 9 are attached to both sides of the two chevron rails 10 fixed to the base 3 inside the roller from the outside, so that the vertical sliding member of the table 2 is provided. That is, it becomes the vertical slider 7.

The structure and accessories of the base 3 will be described with reference to FIG. 5 which is a plan view of the fixed base 3. A pair of angled rails 10 made of equilateral angle iron are erected on the front and rear portions of the base 3 in the longitudinal direction and substantially on the center line of the width so that the vertices 22 face outward from each other. 10 is fixed to the base 3 so that the outer surfaces of the two sides are rail surfaces orthogonal to the 45 ° direction. As shown in FIG. 2, the interval between the front and rear chevron rails 10 is provided at a position where each rail surface and both inner side surfaces of the cam follower 9 of each of the vertical sliders 7 are in contact with each other. The table 2 is restricted by the four cam followers 9 of both sliders 7 from moving in two directions at an angle of 45 ° in the horizontal plane, and can slide freely only in the vertical direction without moving in the horizontal plane.

The base 3 is provided with bearing mounts 35 a, 35 b, 35 c, 35 d for mounting the elevating device 4 and a motor mount 36.

The structure of the lifting device 4 will be described with reference to FIG. 6 and FIGS. 1, 2 and 3 which are plan views of the lifting device 4. Two sets of rotating shafts 13 supported on bearing mounts 35a, 35b, 35c, 35d of the fixed base 3 via bearings 19a, 19b, 19c, 19d are arranged in the width direction of the base 3. Provide in parallel. Further, the rotors 12 are fixed to both ends of each rotating shaft 13 in the same posture. A bearing roller 11 is rotatably connected to one end of the rotary arm 12 and the other end is fixed to the rotation shaft 13. In addition, the motor 14 is installed on the motor mount 36 of the base 3 in parallel with the rotation shaft 13, and the motor 14 and the plurality of (two sets in this example) rotation shafts 13 are connected by the drive connection mechanism 15. The coupling mechanism 15 ensures that, for a certain rotation angle of the motor 14, the posture of the arm 12 in which the upper surfaces of all the support rollers 11 are always the same in a horizontal plane is obtained, that is, the rotation angle of all the rotation shafts 13 is changed. The motor 14 and all the rotating shafts 13 are connected by a chain transmission, a gear train, or a link mechanism so that they are the same regardless of the direction. In this example, the drive coupling mechanism 15 is a chain transmission using chains 18a and 18b, the two drive sprockets 16a and 16b fixed to the motor 14 are the same, and the driven sprockets 17a and 17b are The rotations of the two rotating shafts 13 are the same and the same angle is set in the same direction, and all the arms 12 are in the same posture. Therefore, the upper surfaces of all the bearing rollers 11 are all in the same horizontal plane.

FIG. 7 shows another embodiment of the lifting device 4 a of the present invention, in which a gear train 20, 21 a, 21 b is used for the drive connection mechanism 15, and one drive gear 20 has the same size. And the driven gears 21a and 21b are engaged with each other. Therefore, the rotations of the two rotating shafts 13 and 13 'are rotated by the same angle in directions opposite to each other with respect to the rotation of the motor 14. When the rotary arms 12a and 12c fixed to the other rotating shaft 13 'are mounted in a symmetrical posture with respect to the rotary arms 12b and 12d fixed to one of the rotating shafts 13, the total number of the upper surfaces of all the supporting rollers 11 is increased. Both are on the same horizontal plane.

FIG. 8 is a front view of the table lift device 1 placed near the table rising end with respect to the operation of the table lift device 1 and the interrelation of the table 2, the base 3, and the lifting device 4. This will be described with reference to FIG. 9 which is a front view of the table lift device 1 and FIG. 10 which is a side view thereof. As shown in FIGS. 9 and 10 near the lower end of the table, the table 2 is mounted on four bearing rollers 11 attached to the tip of a downward rotary arm 12. The edge height H1 of the side plate rail 5 and the support height H2 of the rotating shaft 13 are set at least higher than the maximum rotation radius R1 so that the rotary arm 12 can rotate and the bearing roller 11 can revolve. During rotation, the rotating object does not interfere with the ceiling on the back of the table 2 or the upper surface of the base 3. The width Ws of the rotary shaft 13 including the rotary arms 12 at both ends is smaller than the inner width interval Wi of the side plate rails 5 and the distance between the side plate rails 5 is always on the upper surface of the support roller 11. The rotary arm 12 does not contact the side plate rail 5 in the width direction, and the bearing roller 11 is always in contact with the horizontal rolling guide surface 6 and rolls during the revolution.

When the motor 14 is rotated in one direction or in a reciprocating manner, the bearing roller 11 rotates in one direction from the lowest point to the highest point in the orbital circular path 34 or reciprocates in a semicircle. In this structure in which the slider 7 and the angle rail 10 are fitted to each other to restrict the front-rear and left-right movements of the table 2 and the base 3, the table 2 follows only the vertical component of the circular motion of the support roller 11, The ascending and descending operation is performed without moving and following the movement. In FIG. 9 near the lower end of the table, since the vertical component of the circular motion is zero or very small because the rotary arm 12 is directed vertically downward, the table 2 becomes a slow ascending and descending operation, so that slow start and slow stop can be performed. Also in FIG. 8 near the table rising end, since the rotary arm 12 is directed vertically upward, the table 2 is also slowly lifted and lowered, thereby enabling slow start and slow stop.

Since the lift of this electric lift is about 100 mm, the arm radius is as short as about 50 mm, so that a heavy object can be lifted and lowered without employing a high-priced pantograph and a ball screw mechanism.

When the table lift device 1 of the present invention is requested to have various table sizes from the market, it is practically necessary to redesign and manufacture the table 2, the side plate rails 5 and the lifting device 4 each time. Since it is difficult, an application embodiment of this example using the enlarged table 23 has been devised as a solution. FIG. 11 is a front view of an enlarged table lift device 40 to which the embodiment of the present invention is applied. 12 and 13 are a plan view and a side view of the same device. In response to demands for various table sizes, the table lift device 1 of the present embodiment has a fixed size as a unit, and an enlarged table 23 according to the demand is mounted on the table 2. Further, as shown in FIG. 13, since the enlarged table 23 is oversized in the width direction than the distance between the two support rollers 11, when an eccentric load is applied near the end of the enlarged table 23, the side plate rail 5 on the opposite side of the load is lifted. Horizontal rolling plan A force acts to separate the inner surface 6 from the upper surface of the bearing roller 11. In order to prevent this, a reversal prevention guide 24 is provided, fixed to the side plate rail 5, the upper surface is a reversal prevention horizontal rolling guide surface 25, and is in contact with the lower surface of the support roller 11. This and the horizontal rolling guide surface 6 of the side plate rail 5 sandwich the bearing roller 11 to prevent reversal. According to this application example, it is only necessary to manufacture only the enlarged table 23 corresponding to the demand for various table sizes, so that a method that requires much less trouble than the size change of the entire table lift device 1 can be established. .

[0017]

【effect】

 According to the invention described in the claims, a vertical slide mechanism can be formed only by a combination of an equilateral angle iron and a cam follower, and the table can be directly moved up and down by circular motion without converting the rotational motion of the motor into linear motion. Therefore, the mechanism of the table lift device for small head can be simplified.

[Brief description of the drawings]

FIG. 1 is a front view of a table lift device near a center of a table lift according to an embodiment of the present invention.

FIG. 2 is a plan view of the table lift device.

FIG. 3 is a side view of the table lift device.

FIG. 4 is a side view of the main components of the table lift device, the table.

FIG. 5 is a plan view of a main component and a base of the table lift device.

FIG. 6 is a plan view of a main component of the table lift device and an elevating device.

FIG. 7 is a plan view showing the main components of a table lift device and a type of an embodiment of a lifting device.

FIG. 8 is a front view of the table lift device near a table rising end;

FIG. 9 is a front view of the table lift device near the table lower end.

FIG. 10 is a side view of the table lift device near the table lower end.

FIG. 11 is a front view of an enlarged table lift apparatus to which the embodiment of the present invention is applied.

FIG. 12 is a plan view of the enlarged table lift device.

FIG. 13 is a side view of the enlarged table lift device.

FIG. 14 is a front view of a conventional screw type electric table lift using a pantograph and a screw shaft.

FIG. 15 is a plan view of a driving device for a conventional screw-type electric table lift.

[Explanation of symbols]

1 Table lift device 2 Table 3 Base 4 Lifting device 5 Side plate rail 6 Horizontal rolling guide surface 7 Vertical slider 8 Angle guide 9・ Cam follower 10 ・ ・ Angle rail, 11 ・ Support roller, 12 ・ Rotary arm, 13 ・ Rotation axis, 14 ・ Motor, 15
Drive coupling mechanism 23 .. Enlarged table, 24 .. Inversion prevention guide 30. Conventional screw-type electric lift

Claims (1)

[Utility model registration claims] 1. A table lift device having a lifting device between a table and a fixed base for loading various objects to be lifted and lowered on a table, and moving up and down by rotation of a motor. A pair of side plates having a horizontal guide surface on the lower surface, and a pair of equilateral angle steel-shaped right-angled equilateral L-shaped members having rollers pivoted on both sides are formed such that the vertexes of both sides are inwardly inward with respect to the center line of the table. A table having a vertical slider which is disposed at the front and rear ends of the table so as to be equally divided into two at 45 °, and a pair of right-angled equilateral sides which engage with the vertical slider at front and rear ends of the base. A base having a rail fixed vertically and opposed to each other such that the vertices face each other so that the vertices face outward and the sides are orthogonal to each other in the direction of 45 °, and a support roller having the same diameter at the tip end. Connect the pivoted arms to both ends of each axis. A plurality of rotating shafts fixed in a posture, a motor serving as a drive source installed coaxially in parallel, and an arm posture rotating so that all the upper surfaces of all the bearing rollers always form a horizontal plane for the entire rotation range of the motor. A table lift device comprising an elevating device having a drive connection mechanism for moving the table.