JPH0976137A - Work clamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably position and hold a work in relation to a working machine by providing a clamp means for allowing the movement of an extending part in the specified range when a reference part is positioned and held on the other clamp means. SOLUTION: The whole frame for two-wheeled vehicle is positioned and held on a pallet by taking an axis of a head pipe part as a reference in collaboration with a head part end surface clamp means and a pivot part clamp means 200. If there is a dimensional error on the two-wheeled vehicle frame, the movement of main frame parts U is allowed by the suitable movement of float blocks 207R, 207L and clamp bolt 222R, 222L according to the dimensional error, and they are positioned and held without displacement and generation of internal stress on a part of the two-wheeled vehicle frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work having a reference portion and an extension portion extending from the reference portion,
The present invention relates to a work clamp device applied when processing the reference portion.

[0002]

2. Description of the Related Art For example, for a motorcycle frame having a columnar head pipe portion and a main frame portion extending from the peripheral surface of the head pipe portion, the inner peripheral surface of the head pipe portion is centered. When performing the boring process or the buffing process on the outer peripheral surface of the head pipe portion, a work clamp device is applied to perform these processes with high accuracy.

A work clamp device of this type is usually provided with a clamp means for holding the head pipe portion and the main frame portion, respectively, and the positioning of the motorcycle frame with respect to the processing machine by the operation of both clamp means. In addition, the movement of the head pipe portion and the main frame portion is prevented to prevent the displacement of the motorcycle frame during processing.

[0004]

By the way, in the above work clamp device, the relative clamp positions of the clamp means for holding the head pipe portion and the clamp means for holding the main frame portion cannot be changed. Therefore, for example, when there is a dimensional error in the motorcycle frame due to factors such as welding distortion, it is difficult to operate the other clamp means after activating one of the clamp means with respect to the motorcycle frame. There is a risk of becoming.

Further, when both clamp means are forcibly operated with respect to the motorcycle frame having a dimensional error, the processing is performed in a state where the motorcycle frame is deformed, There is a risk that the machining accuracy will be reduced and the machining tool will be damaged.

[0006]

SUMMARY OF THE INVENTION The present invention is a work clamp device applied to a workpiece having a reference portion and an extending portion extending from the reference portion, when the reference portion is processed. And a first clamp means for positioning and holding the reference portion with respect to the processing machine, and the extension portion movably held, and the extension portion when the reference portion is positioned and held by the first clamping means. And a second clamp means that allows the movement of the.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing one embodiment. 19 to 23
[Fig. 2] conceptually shows a work machining facility to which the work clamp device according to the present invention is applied. As shown in FIG. 1, the work processing equipment illustrated here has a cylindrical head pipe portion (reference portion) H and this head pipe portion H.
An iron frame for a motorcycle (hereinafter, simply referred to as a motorcycle frame W) having a main frame portion (extended portion) U extending from the peripheral surface of (1) is processed, and the head pipe portion H is used as a reference, In the buffing step B, after buffing the frame outer surface including the periphery of the pivot bearing portion P in the main frame portion U and the peripheral surface of the head pipe portion H, the boring process is performed based on the head pipe portion H. In the processing step N, for boring the inner peripheral surface of the central hole in the head pipe portion H, and for holding the motorcycle frame W in the work loading step T adjacent to the buffing step B. A plurality of pallets 10 are provided. Although not shown in the drawing, in this work processing equipment, the dimension of the motorcycle frame W is measured in a process preceding the work carrying-in step T, and the dimension error is 2-3 mm. Only those within the allowable range are loaded into the work loading step T.

As shown in FIG. 2, the pallet 10 has a pallet body 11 formed into a rectangular frame having a uniform thickness by appropriately combining a plurality of frame materials. The pallet body 1 is provided with pivot part clamping means (second clamping means) 200 at one end (hereinafter, referred to as rear side) end.
Head end face clamp means (first clamp means for buffing) at the other end (hereinafter referred to as the front side) of 1
30.

As shown in FIGS. 3 and 4, the pivot portion clamping means 200 is for holding a pair of pivot bearing portions P in the main frame portion U of the motorcycle frame W, respectively, and is used for the pallet body 11 Is provided with a base plate 201 on the upper surface thereof. The base plate 201 is in the form of a rectangular flat plate having a length longer than the mutual width of the pair of pivot bearing portions P in the main frame portion U, and faces the pivot bearing portions P in a manner to face the pallet body 11 Mount 2 protruding from the upper surface of the
It is attached to the upper end of 02, and each pivot bearing part P
A pair of left and right holders 203 are provided on the parts facing each other.
It holds R and 203L.

As shown in FIGS. 4 to 7, the holders 203R and 203L are holder bases 204R and 204L, respectively.
A pair of holder side walls 205R and 205L are erected from both ends of L to form a substantially U-shape.
R and 205L are arranged on both sides of the pivot bearing P, and are arranged side by side on the base plate 201 in such a manner that they open upward. As shown in FIGS. 5 and 6, the holders 203R and 203L hold stopper plates 206R and 206L at the upper ends of the holder side walls 205R and 205L, respectively, and the stopper plates 206R and 206L and the holder base portion 204R. , 204L, and a float block 207R configured to be smaller than the space.
207L are housed respectively.

The stopper plates 206R and 206L are
As shown in FIG. 4 to FIG. 7, the holders 203R, 20
3L has a rectangular flat plate shape having almost the same width, and protrudes from the upper ends of the holder side walls 205R, 205L inwardly toward each other. The upper end of each guide rod 208R, 208L Holding The guide rods 208R and 208L are used for the stopper plates 206
The stopper plates 206R and 206L are arranged so that they are perpendicular to the R and 206L and parallel to each other.
From the lower surface of the holder 203R, 203L toward the holder base portions 204R, 204L of the corresponding holders, and the lower end portions of the holders are embedded and held in the holder base portions 204R, 204L.

The float blocks 207R and 207L are
A pair of block side walls 210R and 210L are erected from both ends of the block bases 209R and 209L, respectively, and have a substantially U-shape. With the moving holes 211R and 211L, by inserting the guide rods 208R and 208L into the sliding holes 211R and 211L, respectively, with respect to the holder bases 204R and 204L of the holders 203R and 203L within a predetermined range. Can move toward and away from each other, and further, the lower surfaces of the block bases 209R and 209L and the holders 203R and 203R, respectively.
Float springs 212R and 21 interposed between the upper surfaces of the holder bases 204R and 204L in 203L.
With the pressing force of 2 L, the corresponding holder 203R, 203
The holder bases 204R and 204L of L are constantly pressed in a direction away from each other. The float block 20
Specifically, 7R and 207L can move within a range of 13 mm when the maximum outer shape of the pivot bearing portion P is 44 mm.

As is clear from FIG. 7, each of the float blocks 207R and 207L holds a pair of slide guides 213R and 213L at the front and rear edges between the individual block side walls 210R and 210L.
As shown in FIGS. 4 to 7, the slide guides 213R and 213L extend in parallel to each other in a manner along the width direction of each main frame portion U, and upper ends of the respective slide guides protrude inward from each other. The slide blocks 214R and 214L are supported between them.

The slide blocks 214R and 214L are
As shown in FIGS. 4 to 7, notches 215R and 215L for mounting and accommodating the corresponding pivot bearing portions P, respectively.
The block side walls 210R and 210L
Has a width narrower than the inner surface spacing of each of the slide guides 213R and 213L, and has engaging tongues 216R and 216L at the lower end portions facing the slide guides 213R and 213L, respectively. Guide 213
R and 213L, and as shown in FIG. 7 and FIG.
By interposing the flat needle bearings 218R and 218L between the 17L and the block bases 209R and 209L of the float blocks 207R and 207L, the float blocks 207 within a predetermined range.
It is possible to easily move along the extending direction of each slide guide 213R, 213L in a mode in which it slides on the R, 207L block bases 209R, 209L. Note that the slide blocks 214R and 214L are, in particular, when the width of the pivot bearing portion P is 48 mm,
It is possible to move to the one side within a range of 6 mm in total of 3 mm.

These slide blocks 214R, 214
As shown in FIGS. 4 to 6, L is a pair of leaf springs 219R and 219L interposed between the respective outer side surfaces and the inner surfaces of the block side walls 210R and 210L of the float blocks 207R and 207L, respectively. The pair of leaf springs 219 are pressed from the left and right directions.
By the cooperation of R and 219L, they are respectively occupied in the central portions of the slide guides 213R and 213L in the normal state.

Further, the pivot part clamping means 200 is provided.
As shown in FIGS. 4 to 6 and 9 to 11.
The holders 203R and 203L are provided with pivot clamp arms 220R and 220L, respectively. The pivot part clamp arms 220R, 220L face each other of the holders 203R, 203L via their respective center parts in a manner that the respective tip parts are moved toward and away from the notches 215R, 215L of the corresponding slide blocks 214R, 214L. Arm bracket 2 protruding from the outer surface
21R and 221L are swingably supported, and clamp bolts 222R and 222L are provided at the respective tip portions. The clamp bolts 222R and 222L include the sliding shaft portions 223R and 223L and the sliding shaft portions 223, respectively.
Large diameter clamp piece 2 fixed to the tip of R, 223L
24R and 224L, and the tip surfaces of the individual clamp pieces 224R and 224L are opposed to the cutouts 215R and 215L of the slide blocks 214R and 214L through the sliding shaft portions 223R and 223L. The pivot clamp arms 220R and 220L are provided so as to be able to move forward and backward. These clamp bolts 222
As shown in FIGS. 5 and 6, the R and 222L are pressed by the projecting springs 225R and 225L which are interposed between the base end surfaces of the clamp pieces 224R and 224L and the pivot part clamp arms 220R and 220L. The clamp pieces 224R and 224L are biased from the respective pivot part clamp arms 220R and 220L to the most protruding state.

Further, the pivot part clamping means 20 is provided.
0 is a pair of toggle levers 226R and 226R on one side of the base plate 201, as shown in FIGS.
It is equipped with 6L. These toggle levers 226R, 22
6L is swingably attached to lever brackets 227R and 227L supported by the base plate 201, and one of them is pivot part clamp arm 220R via toggle mechanism 228R and connecting rod 229R.
, And the other is connected to the pivot part clamp arm 220L via the toggle mechanism 228L, the connecting rod 229L and the reversing link arm 230L, and as shown by the solid lines in FIGS. When swinging, the clamp pieces 224R and 224L are cut into the cutouts 215R and 215 of the slide blocks 214R and 214L.
The clamp block 224R, 224L is slid to the slide block 214 when the clamp pieces 224R and 224L are moved downward as shown by the chain double-dashed lines in FIGS.
It serves to separate from the notches 215R and 215L of the R and 214L.

On the other hand, the above-mentioned head end face clamp means 30 is for holding the head pipe part H of the motorcycle frame W from both end faces thereof, and as shown in FIG. And a lower plate 31 and an upper plate 32.

As shown in FIGS. 2 and 12 to 14, the lower plate 31 has a substantially U-shaped flat plate shape having an opening at one end, and the opening of the pallet body 11 is directed toward the rear side. It is arranged along the upper surface and holds an adjusting bolt 33 at the center thereof. The adjusting bolt 33 is brought into contact with a base end portion of a head clamp arm 42, which will be described later, so that the head clamp arm 42 is brought into contact with the base clamp arm 42.
For defining the maximum closed position of the lower plate 31 and is screwed to the lower plate 31 so as to be able to move forward and backward.

As shown in FIGS. 12 and 13, the upper plate 32 is installed between the upper ends of the plate support brackets 34 which are erected from both sides of the lower plate 31, and the upper surface of the pallet body 11 is Incliningly arranged in a manner of gradually expanding toward the rear side, a pair of linear shafts 35 and a pair of opening / closing bolts 36 arranged side by side are provided, and a pair of link brackets 37, 38 are provided. There is.

The linear shafts 35 each have a columnar shape with a uniform outer diameter, and extend from the portions located on both sides of the upper plate 32 toward the lower plate 31 in a manner orthogonal to the upper plate 32. The individual tip portions are held by the lower plate 31.

The opening / closing bolt 36 is a shaft portion 3 having a cylindrical shape.
A hexagonal columnar head portion 36b is provided at the base end portion of 6a, a screw portion 36c is provided at the tip end portion of the shaft portion 36a, and each head portion 36b is directed upward and orthogonal to the upper plate 32. Is rotatably supported at a portion located inward of each linear shaft 35 via each shaft portion 36a, and the slide lever 3 is rotatably supported by each screw portion 36c.
It is equipped with 9,40.

As shown in FIG. 13, the slide levers 39 and 40 respectively extend along the upper plate 32, and the linear shaft 35 is inserted therethrough.
The slide portions 39a, 40a with which the screw portions 36c of the opening / closing bolts 36 are screwed, and the slide portions 39a, 40a are bent in directions opposite to each other from the inner side end portions of the slide portions 39a, 40a. It is configured by having link portions 39b and 40b extending in a parallel manner,
When the opening / closing bolts 36 rotate, the sliding portions 39a and 40a are moved by the action of the screws so that the linear shaft 3
5 moves in parallel along the extending direction of 5 and serves to appropriately change the occupied position with respect to the upper plate 32, as shown by the chain double-dashed line in FIG. The link portion 39b
In the slide lever 39 extending upward from the slide portion 39 a, the tip portion of the link portion 39 b is projected above the upper plate 32 through the opening 32 a formed in the upper plate 32.

As shown in FIG. 12, the link brackets 37 and 38 project from the central portion of the rear end of the upper plate 32 in a direction orthogonal to the upper plate 32 in such a manner that they are separated from each other. Head clamp arms 41 and 42 are provided at the tip. The head clamp arms 41 and 42 are provided with positioning pins 41a and 42a, which are fitted to the open ends of the head pipe parts H of the motorcycle frame W, at their tip ends, and the positioning pins 41a and 42a are expanded with respect to each other. The link brackets 37 and 38 are swingably supported in the opened state, and the base ends of the link brackets 37 and 38 are linked to the link parts 39b and 4 of the corresponding slide levers 39 and 40.
It is locked at 0b. Note that, as shown in FIG. 14, the pair of head clamp arms 41 and 42 have their respective positioning pins 41a and 42a when they are closed.
One of them, in the embodiment, the tip end of the head clamp arm (hereinafter, simply referred to as the upper head clamp arm 41) arranged above is bent appropriately so that the shaft center of the head clamp arm is arranged on the same shaft center. ing.

Further, as shown in FIG. 2, the pallet 10 has a cylindrical body 12 at a portion located on the rear side of the pivot clamp means 200 and at a portion located on the side of the head end surface clamp means 30, respectively. Is equipped with. As shown in FIG. 3, the tubular body 12 has a cylindrical shape having a flange 12a on the peripheral surface at one end, and is oriented vertically in the pallet body 11 with the flange 12a arranged downward. Installed.

When the motorcycle frame W is held by the pallet 10 constructed as described above, the pallet 10 is held in the clamp standby state as described below prior to this. That is, first, by appropriately screwing the adjusting bolt 33 arranged on the lower plate 31 of the head end face clamp means 30, the head clamp arm arranged below (hereinafter simply referred to as the lower head clamp arm 42). ) Of the maximum closed position. After the maximum closed position of the lower head clamp arm 42 is defined, the opening / closing bolt 36 corresponding to the lower head clamp arm 42 is appropriately rotated to arrange the lower head clamp arm 42 at the maximum closed position described above. And the other opening / closing bolt 36 is appropriately rotated, the upper head clamp arm 41
Is arranged at the most expanded position, and the toggle levers 226R and 226L of the pivot part clamping means 200 are further swung downward, so that each clamp bolt 222R as shown by the chain double-dashed line in FIGS. 5 and 6. , 222L
The clamp pieces 224R and 224L are placed at positions separated from the cutouts 215R and 215L of the slide blocks 214R and 214L.

In order to actually hold the motorcycle frame W on the pallet 10 from the above-described clamp standby state, one of the head pipe portions H is first fitted to the positioning pin 42a of the lower head portion clamp arm 42, and The motorcycle frame W is placed on the pallet 10 in such a manner that the pair of pivot bearing portions P are housed in the notches 215R and 215L of the corresponding slide blocks 214R and 214L, respectively.

At this time, according to the pallet 10, the slide block 214 of the pivot clamp means 200 is provided.
Since R and 214L can be easily moved with respect to the holders 203R and 203L and the base plate 201 in a mode along the extending direction of the slide guides 213R and 213L,
If there is a dimensional error in the motorcycle frame W,
Depending on the dimensional error, the slide block 214R,
By appropriately moving 214L, the main frame portion U is allowed to move, and it is possible to mount the main frame portion U on any portion of the motorcycle frame W without causing deformation or generation of internal stress. is there.

From this state, when the toggle levers 226R and 226L of the pivot clamp means 200 are swung upward, respectively, as shown by the solid lines in FIGS. 5 and 6, the clamp pieces of the clamp bolts 222R and 222L are clamped. 224R and 224L are slide blocks 214
It is arranged close to the notches 215R and 215L of R and 214L,
The pivot bearing portion P of the motorcycle frame W is attached to the clamp pieces 224R and 224L and the slide block 21 respectively.
It can be sandwiched and held between 4R and 214L.

Further, when the opening / closing bolt 36 corresponding to the upper head clamp arm 41 of the head end surface clamp means 30 is rotated from the above state to close and move the upper head clamp arm 41,
Positioning pin 4 of the upper head clamp arm 41
By fitting 1a into the head pipe portion H,
The head pipe portion H is held between the head portion clamp arms 41 and 42, and as a result, the head portion end surface clamp means 30 and the pivot portion clamp means 20.
By cooperating with 0, the entire motorcycle frame W can be positioned and held on the pallet 10 with the axis HC of the head pipe H as a reference.

At this time, according to the pallet 10, the float blocks 207R and 207L in the pivot portion clamping means 200 are respectively holders 203R and 203.
L and the base plate 201 can be moved toward and away from each other, and the clamp bolts 222R, 222
22L are pivot clamp arms 220R,
Since it can move back and forth with respect to 220L, if there is a dimensional error in the motorcycle frame W, the float blocks 207R, 207L and the clamp bolts 222R, 222L appropriately move in accordance with the dimensional error to cause the main frame to move. Since the movement of the portion U is allowed, it is possible to position and hold the frame W for a motorcycle without causing deformation or generation of internal stress in any part of the frame W.

The motorcycle frame W held on the pallet 10 has a pair of head clamp arms 41, 4
The shaft center HC of the head pipe portion H is moved to the pallet 10 by the action of the positioning pins 41a and 42a provided in the pallet 10.
With respect to the pallet body 11 on the center line in the width direction of the pallet body 11 in a required position at a required position.
Is inclined forward at an angle α with respect to the upper surface of the pallet, and the opening of the pallet body 11 is positioned on the extension line thereof.

The motorcycle frame W positioned and held on the pallet 10 by the above-described operation is shown in FIG.
As shown in, by driving the circulating conveyor CV,
The pallets 10 are sequentially transported downstream.

The circulating conveyer CV is formed in a substantially rectangular shape in plan view, and a portion corresponding to one long side of the rectangle is the work carrying-in step T, the buffing step B, and the preparation standby step S described above.
And the boring step N, the front end stopper means 50 and the rear end stopper means 6 are provided at the portions corresponding to these steps T, B, S, and N, respectively.
0, and pallet positioning means 70 and pallet holding means 80 are provided at the portions corresponding to the buffing process B and the boring process N, respectively.

The front end stopper means 50 is shown in FIGS.
As shown in FIG. 6, the stopper cylinder actuator 51 is arranged vertically upward at the downstream end of each of the steps T, B, S, and N described above, and the tip end of the operating rod in the stopper cylinder actuator 51 is provided. The front end stopper roller 52 is connected to the front end stopper roller 52. The operation of the stopper cylinder actuator 51 causes the front end stopper roller 52 to move in and out of the passage area of the pallet 10 on the circulating conveyor CV. To make.

The trailing end stopper means 60 is vertically swingable to the upstream end of each of the steps T, B, S, and N described above, and in the normal state, the downstream end thereof is the conveyor belt for circulation. The rear end stopper piece 61 is arranged so as to be inclined with respect to the passage area of the pallet 10 in the CV, and the front end portion of the pallet body 11 of the pallet 10 is located on the front end stopper roller 52. In the case of contact, the downstream end of the rear end stopper piece 61 is located at a position slightly upstream of the rear end of the pallet body 11.

As shown in FIGS. 24 and 30, the pallet positioning means 70 includes a positioning cylinder actuator 71 and a positioning cylinder actuator 71.
And a knock pin 72 connected to the operating rod 71a of the pallet body 11 and the pallet body 11 has the above-mentioned front end stopper means 50.
When disposed between the rear end stopper means 60 and the rear end stopper means 60, the knock pin 72 is occupying the portion corresponding to the cylindrical body 12 of the pallet 10 in a state in which the knock pin 72 is directed vertically upward. It is arranged so that it can appear in and out of the passage area of the pallet 10 in the circulating conveyor CV.

The pallet holding means 80 is shown in FIGS.
As shown in FIG. 9, the upper surface holding cylinder actuator 81 in which the operating rod 81a is arranged vertically upward
An upper surface holding piece 82 pivotally fixed to the operating rod 81a of the upper surface holding cylinder actuator 81, a link reference bracket 83 standing upright from a table CVT constituting the circulating conveyor CV, and the table CVT.
Clamp bracket 84 that is erected from a portion corresponding to the passage area of pallet 10 on the upper surface of the pallet, and cam shaft 8 that is rotatably inserted through the upper end of link reference bracket 83.
5 and the conveyor roller R of the circulating conveyor CV
Of the roller plate RP supporting the roller shaft RP is fixed to both ends of the cam shaft 85 so as to be in contact with the horizontal tongue piece RPZ.
5, a cam 86 that moves the roller plate RP in the vertical direction by rotating around the axis of 5, and one end fixed to the cam shaft 85 and the other end the upper surface holding piece 8
And a link piece 87 that is pivotally attached to the middle portion of the second.

When the cylinder actuator 81 for holding the upper surface is extended, the pallet holding means 80 moves the upper holding piece 82 in a closed manner with respect to the upper end surface of the clamp bracket 84, and at the same time, rotates the cam 86. The pallet body 11 is separated from the peripheral surface of the conveyor roller R by lowering the roller plate RP by the pallet body 11 in such a state.
Is sandwiched between the upper surface holding piece 82 and the clamp bracket 84, and both sides of the pallet body 11 when the pallet body 11 is disposed between the front end stopper means 50 and the rear end stopper means 60 described above. Three parts are provided at each of the parts located on one side.

Further, the circulating conveyer CV includes:
As shown in FIGS. 19 and 20, the pallet diverting means 90 is arranged at a portion corresponding to the boring step N described above. The pallet diverting means 90 is configured such that a portion corresponding to the boring processing step N of the circulating transfer conveyor CV is partially cut off, and as shown in FIGS. 24 to 26, the circulating transfer conveyor CV. And the deflection table 91 including the front end stopper means 50, the rear end stopper means 60, the pallet positioning means 70, and the pallet holding means 80 described above.

The turning table 91 has a rectangular plate shape slightly larger than the pallet 10 and has shaft holding plates 92 on the lower surfaces of both front and rear ends thereof. Revolving shafts 93 are held in the respective parts. The swivel shafts 93 extend in the transport direction of the circulating transport conveyor CV with their axes aligned with each other, and the respective outer ends of the pillow brackets 94 erected from the floor surface F. It is rotatably accommodated in the shaft insertion portion.

As is clear from FIGS. 25 and 26, one of the turning shafts 93 projects inwardly of the shaft holding plate 92 in such a manner that the shaft holding plate 92 is inserted therethrough, and this projecting end portion is formed. The swivel arm 95 is held by the. Swivel arm 95
Extends radially outward from the circumferential surface of the swivel shaft 93, and has a swiveling cylinder actuator 9 at the tip thereof.
6 working rods 96a are pivotally attached. The turning cylinder actuator 96 is supported on the floor surface F through the base end portion of the cylinder body 96b and is swingably arranged in the vertical direction. By rotating the deflection table 91 around the center, the upper surface of the deflection table 91 is horizontally arranged, and the conveyor connection position at which the above-mentioned transport path constituent elements match the circulating transport conveyor CV, and this deflection table. The upper surface of the 91 is vertically arranged to move the above-described transport path constituent elements between the circulating transport conveyor CV and a conveyor cutting position where the conveyor CV is cut. The pillow bracket 94 includes
Adjustable swivel stoppers 97, 98 for restricting the turning range of the deflection table 91 by abutting on the shaft holding plate 92 are provided.

On the other hand, in the work processing equipment, as shown in FIGS. 19 to 23, a pair of buffing robots 100 are provided in the buffing process B, and a pair of buffing robots N are provided in the boring process N. Boring machine 110 and head peripheral surface clamping means (first clamping means for boring)
120 are provided.

As shown in FIGS. 19 and 22, the buffing robot 100 is a multi-joint type that has been generally used as an industrial robot, and holds a buff tool 101 in each hand. One machine is arranged at each of the parts corresponding to each other across the circulating conveyor CV.

As shown in FIG. 23, the pair of boring machines 110 are installed on the slide table 111 so as to face each other, and are arranged so that they can approach and separate from each other by driving the slide table 111. FIG. 19, FIG.
As is clear from FIG. 0 and FIG. 23, in the pair of boring machines 110, when the pallet 10 is positioned and arranged on the turning table 91 which is occupied at the conveyor dividing position, the main axes MC of the pallets are In order to match the shaft center HC of the head pipe portion H in the motorcycle frame W (hereinafter, simply referred to as the motorcycle frame that is occupying the boring position) which is positioned and held on the pallet 10,
It is arranged horizontally and inclined so as to form an angle α with respect to the conveying direction of the circulating conveyer CV.

The head peripheral surface clamping means 120 is provided for positioning the head pipe portion H of the motorcycle frame W on the boring machine 110 by sandwiching the head pipe portion H from the peripheral surface thereof. Then, Figure 1
6 and FIG. 17, a pair of fixed clampers 12
1 and a pair of movable clampers 122.

The fixed clamper 121 has arc-shaped fixing recesses 121a at the respective tip portions that match the peripheral surface of the head pipe H, and these fixing recesses 121a.
a is arranged at a portion corresponding to the peripheral surface of the head pipe portion H of the motorcycle frame W occupying the boring position, respectively, with a distance from the upper surface of the fixed clamper holding table 123 provided on the floor surface F. It is erected.

The movable clamper 122, like the fixed clamper 121, has arc-shaped clamping recesses 122a formed at the respective tip end portions and conforming to the peripheral surface of the head pipe portion H, and the fixed clamps are provided between each other. The movable clamper holding table 124 is provided so as to project downward from the lower surface of the movable clamper holding table 124 with the same spacing as that of the clampers 121 being secured. The movable clamper holding table 124 is connected to an operating rod 126a of a clamp cylinder actuator 126 held by a cylinder holding plate 125,
By the operation of the clamp cylinder actuator 126, the clamp cylinder actuator 126 can be moved vertically while maintaining the horizontal state, and by the operation of the slide cylinder actuator 128, which will be described later, it can be moved along the horizontal direction together with the clamp cylinder actuator 126. And
The pair of movable clampers 122 are fixed clampers 1 respectively.
21 and the retracted position retracted from the upper region of the fixed clamper holding table 123.

The head peripheral surface clamping means 12 is also provided.
0 has a column plate 127 on the floor surface F. As shown in FIG. 19, the column plate 127 is erected vertically upward from a position close to the fixed clamper holding table 123 at an angle α with respect to the conveying direction of the circulating conveyer CV. As shown in FIGS. 16 and 17, while holding the slide cylinder actuator 128 at the outer end thereof,
A pair of rail members 1 is provided on a side surface (hereinafter, simply referred to as a facing side surface) facing the fixed clamper holding table 123.
Holds 29.

Cylinder actuator for slide 128
Is the cylinder body 12 as shown in FIGS.
8b is arranged outside the side surface of the column plate 127 facing the tongue bracket 13 protruding from the column plate 127 through the cylinder body 128b.
0 is mounted horizontally, and its operating rod 128a can move forward and backward along the extending direction within the opposite side surfaces of the column plate 127.

The pair of rail members 129 are horizontally arranged so as to be parallel to each other with the slide cylinder actuator 128 interposed therebetween, and hold the slide base 131 between them. Slide base 131
Has a rectangular flat plate shape having a width from the upper surface of the fixed clamper holding table 123 to the upper end portion of the column plate 127, and the rail member 129 extends in a manner parallel to the column plate 127. It is arranged so as to be movable along the direction, and the outer side end portion thereof is provided with the operating rod 128 of the slide cylinder actuator 128.
The cylinder holding plate 125 is connected to the outer peripheral side surface of the cylinder holding plate 125 via a bracket 132, and a pair of nut runners 140 is provided below the cylinder holding plate 125. There is.

The nut runners 140 are respectively provided with the end face clamp means 3 of the head portion of the pallet 10 via the sockets 142 formed at the tips of the slide shafts 141.
0 is for rotating a pair of opening / closing bolts 36, and when the pallet 10 is positioned and arranged on the turning table 91 which is occupied at the conveyor dividing position,
The pair of opening / closing bolts 36 are arranged in parallel with each other via the nut runner body 143 at the portions corresponding to the extension lines of the opening / closing bolts 36.
The heads 36b of the opening / closing bolts 36 are arranged at the positions where the heads 36b of the opening / closing bolts 36 are fitted into the sockets 142, respectively, when the extension operation of 8 is performed most. As shown in FIG. 18, the slide shaft 141 is housed through a bush 145 inside a cylindrical housing 144 attached to a nut runner body 143, and a connecting shaft 146 fitted to the base end portion thereof. It is linked to the drive shaft 147 via. As is clear from FIG. 18, the slide shaft 141 is operated by a prismatic portion 146a formed at the tip of the connecting shaft 146 so that the connecting shaft 146 can be operated.
Is connected to the shaft so that it can move forward and backward in the axial direction and cannot rotate around the shaft, and a pressing spring 148 interposed between the shaft and the connecting shaft 146 always urges it to project outward. Has been done.

In the work processing equipment constructed as described above, all the stopper cylinder actuators 51 of the front end stopper means 50 arranged on the circulating conveyor CV are retracted so that each front end stopper roller 52 is circulated. The knock pin 72 and each upper surface of the conveyor CV are retracted from the passage area of the pallet 10 and both the positioning cylinder actuator 71 of the pallet positioning means 70 and the upper surface holding cylinder actuator 81 of the pallet holding means 80 are retracted. Positioning on the pallet 10 in each of the above-described steps T, B, S, N is performed by driving the circulating transfer conveyor CV in a transportable state in which the holding piece 82 is retracted from the passage area of the pallet 10 on the circulating transfer conveyor CV. Two-wheeled vehicle frame W so that is conveyed to the downstream.

At this time, in the boring step N, the turning cylinder actuator 96 is extended, the deflection table 91 is arranged at the conveyor connecting position, and the pair of slide tables 111 are driven to drive a pair. The boring machines 110 are arranged at positions distant from each other, and further the clamp cylinder actuator 126 and the slide cylinder actuator 12 are arranged.
By decompressing each of the above, the upper region of the fixed clamper 121 is held open.

When the pallet 10 conveyed downstream passes through the position where the front end stopper roller 52 is arranged, all the stopper cylinder actuators 51 are immediately extended so that the front end stopper rollers of the respective steps T, B, S and N are extended. 52 respectively protrude into the passage area of the pallet 10,
The pallet 10 conveyed from the upstream side process comes into contact with the front end stopper roller 52 to sequentially stop in the next process.

At this time, the rear end stopper piece 61 of the rear end stopper means 60 appropriately swings according to the weight of the pallet 10 when it passes, and allows the pallet 10 to pass downstream while the pallet 10 is passed. Immediately after passing through, the pallet 10 returns to its normal state by its own weight and prevents the pallet 10 from moving to the upstream side.

The pallet 10 is the front end stopper roller 5
2 is confirmed to have been arranged between the rear end stopper piece 61 and the buffing step B and the boring step N described above, the positioning cylinder actuator 71 and the upper surface holding cylinder actuator. 81 sequentially expands, and each knock pin 72
After being fitted into the cylindrical body 12 of the pallet 10, the upper surface holding pieces 82 are closed and moved, whereby the pallet 10 is positioned and held in the respective processing steps B and N.

When the pallet 10 having the motorcycle frame W positioned and held therein is placed in the buffing process B, the pair of buffing robots 100 operate based on the teaching data previously taught, and the motorcycle frame is operated. Required buffing is sequentially performed on the outer surface of the frame including the periphery of the pivot bearing portion P of W and the peripheral surface of the head pipe portion H.

At this time, the motorcycle frame W is positioned and held on the pallet 10 with the axial center HC of the head pipe portion H as a reference, and is further positioned and held in the buffing process B via the pallet 10, so that the buffing process is performed. The processing robot 100 will perform accurate processing.

Moreover, in the buffing step B,
The motorcycle frame W is held on the pallet 10 via both end surfaces of the head pipe portion H and the pivot bearing portion P of the main frame portion U, and the frame outer portion including the periphery of the pivot bearing portion P and the peripheral surface of the head pipe portion H. Since all the surfaces are open, the motorcycle frame W can be buffed without any hindrance.

On the other hand, when the pallet 10 having the motorcycle frame W positioned and held therein is placed in the boring process N,
First, when the turning cylinder actuator 96 is retracted, the turning table 91 is arranged at the conveyor dividing position while holding the pallet 10 on its upper surface, and the motorcycle frame W positioned and held by the pallet 10 is positioned. The head pipe portion H is horizontally arranged in each fixing recess 121a of the fixed clamper 121, as shown by the chain double-dashed line in FIGS.

When it is confirmed that the head pipe portion H is disposed in the fixing recess 121a of the fixed clamper 121,
Next, the slide cylinder actuator 128 is extended, the pair of movable clampers 122 disposed on the movable clamper holding table 124 are arranged above the corresponding fixed clampers 121, and the sockets of the pair of nut runners 140 are arranged. Reference numerals 142 denote opening / closing bolts 3 corresponding to the head end surface clamping means 30.
6 is fitted to the head 36b.

The head 3 of the opening / closing bolt 36 to which the sockets 142 of the pair of nut runners 140 respectively correspond.
When it is confirmed that the movable clamper holding table 124 is fitted in the movable clamper holding table 124, the clamp cylinder actuator 126 is extended to move the movable clamper holding table 124 downward. The head pipe portion H of the motorcycle frame W is sandwiched between the clamper 122 and the pair of fixed clampers 121. Further, from this state, the pair of nut runners 140 is driven, and the pair of head portion clamp arms. Both ends of the head pipe portion H are opened by the expanding movement of 41 and 42.

Here, when the head pipe portion H of the motorcycle frame W is clamped between the pair of fixed clampers 121 and the pair of movable clampers 122, as described above, the sliding of the pivot portion clamping means 200 is performed. The blocks 214R and 214L are slide guides 213, respectively.
The holder 203 is arranged along the extending direction of R and 213L.
R, 203L and the base plate 201 can be easily moved, and the clamp bolts 222R, 22
2L is the pivot arm clamp arm 220R, 2L
The float blocks 207R and 207L can be moved forward and backward with respect to the 20L, and the holders 203R and 203L can be respectively moved.
Since it can move in the direction in which it approaches and separates from L and the base plate 201, even if there is a dimensional error in the motorcycle frame W, the slide blocks 214R, 214L, the clamp bolt 2 described above are corresponding to the dimensional error.
22R, 222L and float block 207R, 2
The respective 07L appropriately move to allow the main frame portion U to move, so that the shaft of the head pipe portion H can be prevented without causing deformation or generation of internal stress in any portion of the motorcycle frame W. The core HC can be positioned and held on the extension line of the main axis MC in the boring machine 110.

Moreover, in the motorcycle frame W, since both end surfaces of the head pipe portion H are open as described above, the slide table 111 is driven from this state to bring the boring machine 110 close to each other. If you place it,
Accurate boring can be performed on the inner peripheral surface of the head pipe portion H without any trouble, and there is no fear that machining accuracy will be reduced or the machining tool will be damaged. At this time, the boring machine 110 on one side performs boring processing on the inner peripheral surface of the head pipe portion H through the opening of the pallet body 11.

When boring of the inner peripheral surface of the head pipe portion H is completed, the actuator is operated in the reverse order of the above procedure, and the turning table is held with the motorcycle frame W held on the pallet 10 again. 91 is returned to the conveyor connection position. That is, first, the head pipe portion H is clamped by the closing movement of the pair of head clamp arms 41, 42 by driving the nut runner 140, and then the clamp cylinder actuator 126 is retracted to be fixed to the movable clamper 122. The clamped state of the head pipe portion H by the clamper 121 is released. Further, when the sliding cylinder actuator 128 is contracted and retracted, the upper region of the head pipe portion H is opened, and lastly, when the swing cylinder actuator 96 is expanded, the deflection table 91 holds the pallet 10 on its upper surface. Return to the conveyor connection position. Even in this case, the action of the pivot part clamping means 200 described above causes the motorcycle frame W to be transferred to the pallet 10 again without causing any deformation or internal stress in any part of the motorcycle frame W. It will be positioned and held.

After the buffing process B and the boring process N described above, the pallet 10 is transported further downstream after the motorcycle frame W has been unloaded in the work unloading process D, and then again in the work loading process T. The motorcycle frame W is to be mounted, while the processed motorcycle frame W unloaded from the pallet 10 in the work unloading process D is the next process (not shown) by the transport conveyor indicated by the symbol HCV in FIG. It will be transported to the facility.

After that, the above-described procedure is repeatedly performed, and the buffing and boring processing is sequentially and accurately applied to the motorcycle frame W.

As described above, according to the workpiece machining equipment, in both the buffing process B and the boring process N, when the head pipe portion H is positioned and held with respect to the machining machine, the pivot portion clamping means is used. Since 200 allows the main frame portion U to move due to the dimensional error of the motorcycle frame W, deformation or internal stress does not occur at any part of the motorcycle frame W, and the machining accuracy is reduced. There is no risk of damage to the machining tools.

In the above embodiment, the device for positioning and holding the head pipe portion of the iron frame in the motorcycle is exemplified, but it has the reference portion and the extension portion extending from the reference portion. As long as the reference part is processed, it can be applied to other works. In this case, the reference portion does not necessarily have to be cylindrical. Further, the apparatus for performing the buffing and the boring processing on the work is illustrated, but the processing is not limited to these.

Further, in the above embodiment, the movement of the extended portion within the predetermined range is allowed by the movement of the float block toward and away from the holder and the slide movement of the slide block with respect to the float block. It is not necessarily limited to these movement modes.

[0072]

As described above, according to the present invention,
When the first clamp means is actuated, the second clamp means allows the extension portion to move within a predetermined range,
Even if there is a dimensional error in the work, it can be reliably positioned and held on the processing machine without causing deformation or internal stress in the work, which reduces the processing accuracy and damages the processing tool. Will be able to prevent.

[Brief description of drawings]

FIG. 1 is a side view conceptually showing a pallet to which a work clamp device according to the present invention is applied.

FIG. 2 is a plan view of the pallet shown in FIG.

FIG. 3 is an enlarged view of a main part of the pallet shown in FIG.

FIG. 4 is a view on arrow IV in FIG.

5 is a sectional view taken along line VV in FIG.

6 is a sectional view taken along line VI-VI in FIG.

FIG. 7 is a sectional view taken along line VII-VII in FIG. 4;

8 is a perspective view conceptually showing a flat needle bearing included in the pallet shown in FIG.

9 is a sectional view taken along line IX-IX in FIG.

10 is a sectional view taken along line XX in FIG.

11 is a sectional view taken along line XI-XI in FIG.

FIG. 12 is an enlarged view of a main part of the pallet shown in FIG.

13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is a view taken along arrow XIV in FIG.

FIG. 15 is a plan view conceptually showing boring processing equipment for a motorcycle frame to which the pallet shown in FIG. 1 is applied.

16 is a side view of the boring process facility shown in FIG.

FIG. 17 is a view taken along arrow XVII in FIG.

FIG. 18 is a sectional view conceptually showing a main part of an end face opening means included in the boring process facility shown in FIG. 15.

19 is a plan view conceptually showing finishing processing equipment for a motorcycle frame including the boring processing equipment shown in FIG.

20 is a sectional view taken along line XX-XX in FIG.

FIG. 21 is an arrow XXI diagram in FIG. 20.

22 is a sectional view taken along line XXII-XXII in FIG.

23 is a sectional view taken along line XXIII-XXIII in FIG.

FIG. 24 is a plan view conceptually showing pallet deflecting means included in the boring process facility shown in FIG. 15.

FIG. 25 is a view taken along the line XXV in FIG. 24.

FIG. 26 is a view taken along the line XXVI in FIG. 25.

FIG. 27 is an enlarged side view showing a main part of the pallet deflecting means shown in FIG. 24.

FIG. 28 is a view taken along the arrow XXVIII in FIG. 27.

29 is an enlarged sectional view taken along line XXIX-XXIX in FIG. 25.

30 is an enlarged cross-sectional view taken along the line XXX-XXX in FIG.

[Explanation of symbols]

30 ... Head end face clamping means, 31 ... Lower plate, 32 ... Upper plate, 33 ... Adjustment bolt, 3
4 ... Plate support bracket, 35 ... Linear shaft,
36 ... Opening / closing bolts, 37, 38 ... Link brackets,
39, 40 ... Slide lever, 41, 42 ... Head clamp arm, 43, 44 ... Link, 120 ... Head peripheral surface clamping means, 121 ... Fixed clamper, 122 ... Movable clamper, 123 ... Fixed clamper holding table, 12
4 ... Movable clamper holding table, 125 ... Cylinder holding plate, 126 ... Clamping cylinder actuator, 127 ... Column plate, 128 ... Sliding cylinder actuator, 129 ... Rail member, 130 ... Tongue bracket, 131 ... Slide base, 132 ... Bracket, 200 ... Pivot part clamping means, 201 ... Base plate, 202 ... Mounting base, 203R, 203L ...
Holder, 206R, 206L ... Stopper plate, 20
7R, 207L ... Float block, 208R, 208
L ... Guide rod, 211R, 211L ... Sliding hole, 21
2R, 212L ... Float spring, 213R, 21
3L ... slide guide, 214R, 214L ... slide block, 215R, 215L ... notch, 216R, 21
6L ... engaging tongue 217R, 217L ... accommodating recess, 21
8R, 218L ... Flat needle bearing, 219
R, 219L ... Leaf spring, 220R, 220L ... Pivot part clamp arm, 221R, 221L ... Arm bracket, 222R, 222L ... Clamp bolt, 223
R, 223L ... Sliding shaft portion, 224R, 224L ... Clamp piece, 225R, 225L ... Projection spring, 22
6R, 226L ... Toggle lever, 227R, 227L ...
Lever bracket, 228R, 228L ... toggle mechanism,
229R, 229L ... Continuous rod, 230L ... Inverting link arm, H ... Head pipe part, U ... Main frame part, W ... Motorcycle frame.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 27, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

SUMMARY OF THE INVENTION The present invention is a work clamp device applied to a workpiece having a reference portion and an extending portion extending from the reference portion, when the reference portion is processed. A first clamp means for positioning and holding the reference portion with respect to the processing machine, and a second clamp means for holding the extension portion in a mode that allows the extension portion to move within a predetermined range. Is equipped with.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction contents]

From this state, when the opening / closing bolt 36 corresponding to the upper head clamp arm 41 of the head end surface clamp means 30 is rotated to move the upper head clamp arm 41 in a closed state, the upper head clamp is clamped. By fitting the positioning pin 41a of the arm 41 to the head pipe portion H, the head pipe portion H is held between the head portion clamp arms 41 and 42.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

Further, from the above state, the toggle levers 226R and 226L of the pivot part clamping means 200 are set.
When each of the clamp bolts 222R and 222L is swung upward, as shown by the solid lines in FIGS.
Clamp pieces 224R, 224L are arranged close to the cutouts 215R, 215L of the slide blocks 214R, 214L, and the pivot bearing portions P of the motorcycle frame W are clamped and held between the clamp pieces 224R, 224L and the slide blocks 214R, 214L, respectively. After all, the head end face clamp means 30 and the pivot portion clamp means 200 cooperate with each other, so that the entire frame W for the motorcycle is pallet 10 with the axial center HC of the head pipe portion H as a reference. Can be positioned and held at.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

At this time, according to the pallet 10, the float blocks 207R and 207L in the pivot portion clamping means 200 are respectively holders 203R and 203.
L and the base plate 201 can be moved toward and away from each other, and the clamp bolts 222R, 222
22L are pivot clamp arms 220R,
Since it can move back and forth with respect to 220L, if there is a dimensional error in the motorcycle frame W, the float blocks 207R, 207L and the clamp bolts 222R, 222L appropriately move in accordance with the dimensional error to cause the main frame to move. Since the movement of the portion U is allowed, it is possible to position and hold the frame W for a motorcycle without causing deformation or generation of internal stress in any part of the frame W.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction contents]

The motorcycle frame W held on the pallet 10 has a pair of head clamp arms 41, 4
The shaft center HC of the head pipe portion H is moved to the pallet 10 by the action of the positioning pins 41a and 42a provided in the pallet 10.
With respect to the pallet body 11 on the center line in the width direction of the pallet body 11 in a required position at a required position.
Is inclined forward at an angle α with respect to the upper surface of the pallet, and the opening of the pallet body 11 is positioned on the extension line thereof. Further, the head end face clamp means 30 is first operated, and then the pivot part clamp means 200 is operated. However, when these clamp means 30, 200 are operated in reverse, the same effect as above is obtained. Can be expected.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction contents]

The pallet holding means 80 is shown in FIGS.
As shown in FIG. 9, the upper surface holding cylinder actuator 81 in which the operating rod 81a is arranged vertically upward
An upper surface holding piece 82 pivotally fixed to the operating rod 81a of the upper surface holding cylinder actuator 81, a link reference bracket 83 standing upright from a table CVT constituting the circulating conveyor CV, and the table CVT.
Clamp bracket 84 that is erected from a portion corresponding to the passage area of pallet 10 on the upper surface of the pallet, and cam shaft 8 that is rotatably inserted through the upper end of link reference bracket 83.
5 and the conveyor roller R of the circulating conveyor CV
The roller plate RP that supports the roller plate RP is fixed to both ends of the cam shaft 85 so as to be in contact with the horizontal tongue RPZ of the roller plate RP, and is rotated around the axis of the cam shaft 85 to move the roller plate RP in the vertical direction. The cam 86 is provided with a link piece 87, one end of which is fixed to the cam shaft 85 and the other end of which is pivotally fixed to an intermediate portion of the upper surface holding piece 82.

[Procedure amendment 8]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

[Figure 3]

Claims (1)

[Claims] 1. A work clamp device applied to a workpiece having a reference portion and an extension portion extending from the reference portion when the reference portion is processed, the workpiece clamping device comprising: First for positioning and holding the reference part
Clamping means, and second clamping means that holds the extending portion movably and allows the extending portion to move within a predetermined range when the reference portion is positioned and held by the first clamping means. And a work clamp device.