JP3592022B2 - Variable pitch between shafts of multi-shaft nut runner - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a device for varying the pitch between shafts of a multi-shaft nut runner.
[0002]
[Prior art]
In a multi-product mass production assembling line (for example, an assembling line including tightening of a bolt for a bearing cap of a cylinder block), a plurality of types of tightening objects (work) having different pitches between nuts are combined into one multi-axis nut runner. When the nut is tightened, it is necessary to change the pitch between the nut runner shafts every time the pitch between the nuts of the work changes.
6 to 8 show a conventional multi-shaft nut runner. In the conventional apparatus, the nut runner 103 is held by a holding plate 102, and the holding plate 102 is fixed to a cylinder rod 105 of an air cylinder 104 attached to a unit base 101. Is to be moved. The moving width of the nut runner 103 is determined by two positions, a position corresponding to the fixed stopper 106A and a position corresponding to the fixed stopper 106, and the inter-axis pitch of the multi-shaft nut runner is variable only between these two positions.
[0003]
[Problems to be solved by the invention]
However, in order to make the inter-axis pitch of the conventional multi-shaft nut runner variable between the above-mentioned two positions and different positions, it is conventionally necessary to replace the entire apparatus, and the multi-shaft nut runner is increased each time the type of work increases. Additional equipment must be provided. This significantly increases equipment costs.
Further, for example, even if the position of the fixed stopper 106 is adjusted to cope with a change in the type of work flowing through the line, a great deal of time is required for the setup and adjustment, and it is not possible to keep up with the tact time of the work. A multi-shaft nut runner device must be prepared in advance and additionally provided.
Further, if it is attempted to change the pitch between the axes of the multi-shaft nut runner in both the X direction and the Y direction orthogonal thereto, a variable device is required in each direction, and the device becomes more complicated and larger.
An object of the present invention is to replace a part of the device only (with the same device) to cope with a change in the pitch between the axes of the nut runner, and the replacement is setup-free and does not require much time (in the work tact). It is an object of the present invention to provide a variable pitch device between shafts of a multi-shaft nut runner.
[0004]
[Means for Solving the Problems]
The present invention that achieves the above object is as follows.
Unit base,
Two Y-axis direction nut runner holding plates that can move relative to each other in the Y-axis direction parallel to the unit base;
An X-axis direction nut runner holding plate that is relatively movable in the X-axis direction orthogonal to the Y-axis direction with respect to each Y-axis direction nut runner holding plate;
An inter-axle pitch variable device of a multi-shaft nut runner provided in a multi-shaft nut runner unit having
A Y-axis direction stopper block attached to each Y-axis direction nut runner holding plate,
An X-axis direction stopper block attached to each X-axis direction nut runner holding plate,
A Y-axis direction stopper surface which is made of a single member detachable from the unit base and which variably determines the inter-axis pitch of the nut runner in the Y-axis direction by contacting the Y-axis direction stopper block; A stopper block formed on the single member with an X-axis direction stopper surface that variably determines an inter-axis pitch of the nut runner in the X-axis direction by contacting the stopper block;
Variable pitch device for multi-shaft nutrunners.
[0005]
In the variable inter-axle pitch device of the multi-axis nut runner of the present invention, the stopper surface for the Y-axis direction and the stopper surface for the X-axis direction of the stopper block are made different depending on each work, and the stopper block composed of a single block By changing the pitch between the axes. It is the stopper block that is replaced and the rest of the device is shared. In addition, when replacing the stopper block, the stopper block is positioned on the unit base, so that setup and adjustment are not required, and the replacement can be completed within the tact of the work. In addition, a single stopper block can variably oppose the pitch in the X-axis direction and the Y-axis direction, and it is not necessary to provide a variable pitch device in each of the X-axis direction and the Y-axis direction. It is detached.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 1 to 5 show a multi-axis nut runner inter-pitch variable device provided for a multi-axis nut runner unit according to an embodiment of the present invention.
The multi-axis nut runner unit includes a horizontally arranged unit base 2, two Y-axis direction nut runner holding plates 5 movable relative to each other in the Y-axis direction parallel to the unit base 2, and each Y-axis direction nut runner. And an X-axis direction nut runner holding plate 7 that can move relative to the holding plate 5 in the X-axis direction orthogonal to the Y-axis direction. A nut runner 13 is held by each of the Y-axis direction nut runner holding plates 5 and each of the X axis direction nut runner holding plates 7.
[0007]
A Y-axis direction air cylinder 8 is provided between the two Y-axis direction nut runner holding plates 5 and extends and contracts in the Y-axis direction. The cylinder portion of the Y-axis direction air cylinder 8 is one of the Y-axis direction nut runners. The Y-axis direction air cylinder rod 9 of the Y-axis direction air cylinder 8 connected to the holding plate 5 is connected to the other Y-axis direction nut runner holding plate 5. Then, by driving the Y-axis direction air cylinder 8, the two Y-axis direction nut runner holding plates 5 move relative to each other in the Y-axis direction, and the pitch between the nut runners 13 in the Y direction is changed. The movement of the Y-axis direction nut runner holding plate 5 is guided by a Y-axis direction LM (linear motion) guide 3.
[0008]
Each of the Y-axis direction nut runner holding plates 5 and the X-axis direction nut runner holding plate 7 which is movable relative to the Y-axis direction nut runner holding plate 5 expands and contracts in the X-axis direction. An air cylinder 10 for the X-axis direction is provided. The cylinder portion of the X-axis direction air cylinder 10 is connected to the Y-axis direction nut runner holding plate 5, and the X-axis direction air cylinder rod 11 of the X-axis direction air cylinder 10 is connected to the X-axis direction nut runner holding plate. 7. By driving the air cylinder 10 for the X-axis direction, the nut runner holding plate 5 for the Y-axis direction and the nut runner holding plate 7 for the X-axis direction on the nut runner holding plate 5 for the Y-axis direction are connected to the X-axis direction. , The pitch between the nut runners 13 in the X direction is changed. The movement of the X-axis direction nut runner holding plate 7 is guided by an X-axis direction LM (linear motion) guide 6.
[0009]
The multi-axis nut runner unit provided with the multi-axis nut runner unit includes an inter-axis pitch variable device, which comprises a Y-axis direction stopper block 4 attached to each Y-axis direction nut runner holding plate 5, and an X-axis direction nut An X-axis direction stopper block 12 attached to the runner holding plate 7 and a stopper block 1 made of a single member detachable from the unit base. The stopper block 1 contacts the Y-axis direction stopper block 4 and variably determines the inter-axis pitch of the nut runner 13 in the Y-axis direction. The Y-axis direction stopper surfaces 16 and 17 and the X-axis direction stopper block 12 And X-axis direction stopper surfaces 18 and 19 for variably determining the inter-axis pitch of the nut runner 13 in the X-axis direction. These stopper surfaces 16, 17, 18, 19 are formed on the stopper block 1, which is a single member, as shown particularly in FIG. In FIGS. 1 to 4, the stopper block 1 is hatched so that the arrangement position can be seen at a glance.
[0010]
The stopper block 1 is positioned and mounted on the unit base 2 from the lower surface side of the unit base 2, and the portion where the Y-axis direction stopper surfaces 16 and 17 and the X-axis direction stopper surfaces 18 and 19 are formed is formed on the unit base 2. It projects through the hole or notch to the upper surface side of the unit base 2, and the portion projecting toward the upper surface side of the unit base 2 hits the Y-axis direction stopper block 4 and the X-axis direction stopper block 12.
When the work is changed and the Y-axis direction stopper surfaces 16 and 17 and the X-axis direction stopper surfaces 18 and 19 are changed, only the stopper block 1 is replaced.
The stopper block 1 is automatically positioned on the unit base 2 by inserting a pin 15 fixed to the unit base 2 into a pin hole formed in the stopper block 1.
[0011]
In this state, the stopper block 1 is fixed to the unit base 2 by the clamper 14. The clamper 14 includes a shaft 20 extending downward from the unit base 2, an arm 22 that rotates around the shaft 20 and has a stopper block holding portion formed at one end and a handle 21 formed at the other end, and a spring 23 that urges the arm 22 upward. And FIG. 2 shows a state in which the clamper 14 fixes the stopper block 1 to the unit base 2. When the stopper block 1 is removed from the unit base 2, the arm 22 of the clamper 14 is rotated 90 ° in the horizontal plane direction. Then, the engagement between the arm 22 and the clamper 14 is released. The attachment and detachment of the stopper block 1 to and from the unit base 2 is performed by a simple operation of rotating the arm 22 of the clamper 14, so that the time required for attachment and detachment is sufficiently short, and can be performed within the tact time of the work flowing through the line. .
A handle 24 is attached to the stopper block 1 as shown in FIG. The drawing other than FIG. 3 shows the state in which the handle 24 is removed from the stopper block 1. The presence of the handle 24 facilitates handling when the stopper block 1 is attached to and detached from the unit base 2.
[0012]
Next, the operation will be described.
To change the pitch between the nut runners 13 in the Y-axis direction, the Y-axis direction air cylinder 8 is operated. As a result, the two Y-axis direction nut runner holding plates 5 move relatively to approach or separate from each other, and a pair of nut runners 13 on one of the Y-axis direction nut runner holding plates 5 (A and B in FIG. 1). And a pair of nut runners 13 (C, D in FIG. 1) on the other Y-axis direction nut runner holding plate 5 approach or separate from each other in the Y-axis direction, and are arranged in the Y-axis direction. The pitch between the axes of the runners 13 (A and C in FIG. 1) is changed, and the pitch between the axes of the two nut runners 13 (B and D in FIG. 1) is changed. In this case, the pitch between the nut runner shafts in the Y-axis direction is determined by the position where one end of the Y-axis direction stopper block 4 hits the stopper surface 17 of the stopper block 1 and the other end of the Y-axis direction stopper block 4. Of the stopper block 1 can be changed to two pitches, and a pitch determined by a position at which the stopper block 16 hits the stopper surface 16.
[0013]
To change the pitch between the nut runners 13 in the X-axis direction, each X-axis direction air cylinder 10 is operated. As a result, each of the X-axis direction nut runner holding plates 7 relatively moves with respect to the Y-axis direction nut runner holding plate 5 supporting the same, and a pair of the one Y-axis direction nut runner holding plate 5 The nut runners 13 (A, B in FIG. 1) approach or separate in the X-axis direction, and the other pair of nut runners 13 (C, D in FIG. 1) on the other Y-axis direction nut runner holding plate 5 The pitch between the axes of the two nut runners 13 (A and B in FIG. 1) approaching or separating in the X-axis direction and being arranged in the X-axis direction is changed, and the two nut runners 13 (C and D in FIG. 1) are changed. Can be changed. In this case, the inter-axis pitch in the X-axis direction is determined by the pitch determined by the position where one end of the X-axis direction stopper block 12 hits the stopper surface 18 of the stopper block 1 and the other end of the X-axis direction stopper block 12 is defined by the stopper. The pitch can be changed to two pitches, that is, a pitch determined by a position where the block 1 hits the stopper surface 19.
[0014]
When it is necessary to change the pitch between the axes of the nut runner 13 due to a change in the type of the work flowing through the line, this is performed by replacing only the stopper block 1. By replacing the stopper block 1, it is possible to cope with a change in the pitch between the nut runners 13 within the range of the stroke of the air cylinder 8 for the Y-axis direction and the air cylinder 10 for the X-axis direction. In this case, there is no need to replace the entire apparatus as in the related art, and it is not necessary to prepare a plurality of entire apparatuses in advance. Therefore, it is only necessary to use one device and replace only the stopper block 1, which is a part of the device. As a result, the number of devices can be reduced, the devices can be simplified, the devices can be downsized, and equipment costs can be reduced.
[0015]
The replacement of the stopper block 1 can be performed by removing the stopper block 1 by the clamper 14, attaching a new stopper block 1, and fixing the new stopper block 1 by the clamper 14, and can be performed in a short time. It can be performed within the takt time of the workpiece flowing on the line. The positioning is automatically performed by the pin 15 at the time of mounting, so that no setup and adjustment time is required.
[0016]
【The invention's effect】
According to the inter-axle pitch variable device of the multi-shaft nut runner of the present invention, by replacing the stopper block consisting of a single block, it is possible to cope with the change in the inter-axle pitch of the nut runner, so only the stopper block needs to be replaced, Other parts of the device can be shared. In addition, when replacing the stopper block, the stopper block can be automatically positioned when the stopper block is mounted on the unit base, so that setup and adjustment are not required, and the replacement can be completed sufficiently within the work tact. In addition, a single stopper block can variably oppose the pitch in the X-axis direction and the Y-axis direction, and there is no need to provide a variable pitch device in each of the X-axis direction and the Y-axis direction. You can also measure.
[Brief description of the drawings]
FIG. 1 is a plan view of a multi-shaft nut runner having an inter-shaft pitch varying device according to one embodiment of the present invention.
FIG. 2 is a front view of the apparatus of FIG.
FIG. 3 is a left side view of the apparatus of FIG. 1;
FIG. 4 is a right side view of the apparatus of FIG. 1;
FIG. 5 is a plan view of a stopper block in the apparatus of FIG.
FIG. 6 is a plan view of a conventional multi-shaft nut runner having an inter-shaft pitch varying device.
FIG. 7 is a front view of the apparatus of FIG. 6;
FIG. 8 is a rear view of the apparatus of FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stopper block 2 Unit base 3 LM guide for Y axis direction 4 Stopper block for Y axis direction 5 Nut runner holding plate 6 for Y axis direction LM guide 7 for X axis direction Nut runner holding plate 8 for X axis direction For Y axis direction Air cylinder 9 Air cylinder rod for Y axis direction 10 Air cylinder for X axis direction 11 Air cylinder rod for X axis direction 12 Stopper block 13 for X axis direction Nut runner 14 Clamper 15 Pin 16, 17 Y axis direction stopper surface 18, 19 X-axis direction stopper surface 20 Axis 21 Handle 22 Arm 23 Spring 24 Handle

Claims (1)

Unit base,
Two Y-axis direction nut runner holding plates that can move relative to each other in the Y-axis direction parallel to the unit base;
An X-axis direction nut runner holding plate that is relatively movable in the X-axis direction orthogonal to the Y-axis direction with respect to each Y-axis direction nut runner holding plate;
An inter-axle pitch variable device of a multi-shaft nut runner provided in a multi-shaft nut runner unit having
A Y-axis direction stopper block attached to each Y-axis direction nut runner holding plate,
An X-axis direction stopper block attached to each X-axis direction nut runner holding plate,
A Y-axis direction stopper surface which is made of a single member detachable from the unit base and which variably determines the inter-axis pitch of the nut runner in the Y-axis direction by contacting the Y-axis direction stopper block; A stopper block formed on the single member with an X-axis direction stopper surface that variably determines an inter-axis pitch of the nut runner in the X-axis direction by contacting the stopper block;
Variable pitch device for multi-shaft nutrunners.

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