JPH0435296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a transfer machine for passing a large number of workpieces through a production line including machining.

(Prior Art) In factories where a large number of workpieces are passed through a production line that includes various processing stations, a dedicated transfer machine is installed in order to accurately transfer the workpieces along the line.

Such transfer machines are generally used to clamp and transport workpieces when work at a processing station involves tooling and it is desirable to transfer workpieces intermittently, such as in the automobile industry. A jig, a clamping station for clamping the workpiece to the transport jig, an unclamping station for unclamping the workpiece, or a workpiece loading/unloading station that performs both clamping and unclamping in one place, and a workpiece outside the processing station. and a guide rail for guiding the conveyance jig via such a clamp station, unclamp station, or workpiece attachment/detachment station. The conveyance jig usually consists of a pallet member supported and guided by a guide rail, and a clamp member that clamps a workpiece to the front side of the pallet member. Incidentally, the clamp members of the transport jig are normally arranged in an arrangement pattern depending on the size and number of the workpieces to be clamped.

Conventionally, in a transfer machine having such a configuration, as shown in Japanese Patent Publication No. 56-95557, etc., a tightening bolt for tightening the pallet member is applied to the clamp member of each transfer jig, while the clamp station or An elevating plate is provided on the unclamping station or workpiece loading/unloading station, and nut runners as fasteners are installed at each position corresponding to the tightening bolts, and these nut runners turn the nuts of each tightening bolt from the front side of the pallet member. Accordingly, the workpiece was to be clamped and unclamped.

(Problem to be solved by the invention) For this reason, in order to avoid interference between the top of the workpiece, the clamp member, or the tightening bolt and the nut runner,
The space on the front side of the pallet member is restricted, and the size of the workpiece has to be restricted accordingly. Furthermore, since the nut runners cannot be overlapped, the distance between the tightening bolts and, by extension, between the clamp members cannot be made very small. Moreover, each time the arrangement pattern of the clamp members differs, the fastener side must be replaced with a separate unit, resulting in a corresponding reduction in work efficiency and cost.

The present invention has been made to effectively solve the problems in the conventional transfer machine, and its purpose is to make the clamping operation of the workpiece and the tightening of the clamping member inseparable. By breaking away from the traditional concept of clamping and approaching the reality of clamps from a new perspective, we can eliminate the need for fasteners such as nut runners, solve space constraints on the front side of pallet members, and thereby reduce work size. In addition, there is no need to worry too much about the distance between clamp members, and even if the arrangement pattern of clamp members is different,
The goal is to provide a transfer machine that can be used as is.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a jig for clamping and transporting a workpiece, and a workpiece for clamping or unclamping the workpiece on the jig. In a transfer machine equipped with a workpiece loading/unloading station and a guide rail passing through the station, the workpiece loading/unloading station includes a pair of lifting cylinder units, a push plate integrally connected to the lifting cylinder unit, and a push plate connected integrally to the lifting cylinder unit. A toggle mechanism for regulating the upper limit position of the push plate is provided, a horizontal cylinder unit is integrally connected to the push plate, and a hook is provided on the cylinder rod. The jig also includes a pallet member running on the guide rail, a clamp arm disposed on the pallet member, a clamp rod coupled to the clamp arm, and an elastic member urging the clamp rod downward. The lower end of the clamp rod protrudes from the back side of the pallet member and faces the upper part of the push plate, and the lower end of the clamp rod is provided with a rotating shaft. The arm is fixed and connected by a link to a hook member provided at the rear end of the pallet member that can move forward and backward, and when this hook member engages with the hooking pawl and moves forward and backward, the clamp arm pivots and the pushbutton is moved back and forth. When the plate moves upward, the clamp arm is pushed up.

In addition, the work loading/unloading station is provided with a plurality of check plates to prevent the jig from lifting up.

(Function) According to the above means, the clamp arm and the clamp rod are urged downward by the elastic member, and this urging force presses and holds the workpiece. By moving the clamp arm and pushing up the clamp rod with the push plate, the pressing force on the workpiece by the clamp arm can be released. For example, the mechanism can be simplified by raising and lowering multiple clamp rods with a single push plate, and if the push plate has a certain size, the arrangement pattern of the clamp arms can be changed. However, this can be dealt with simply by changing the arrangement of the clamp rods, etc. on the pallet member side.
At this time, the position of the push plate is reliably held by the toggle mechanism at the uppermost position.

Further, a hook is provided on the horizontal cylinder unit attached to the push plate, and the hook member is moved forward and backward by the hook, and the swing arm is rotated via the rod and link plate connected to the hook member. The plurality of clamp rods and clamp arms fixed to this rotating arm can be rotated all at once, and each clamp arm can be retracted to a position where it will not interfere with the workpiece.

By providing such a workpiece clamping and unclamping mechanism on the back side of the pallet member, the space on the front side is not restricted and the overall structure can be simplified.

(Example) Hereinafter, a transfer machine with a workpiece loading/unloading station according to an example of the present invention will be described based on the accompanying drawings.

First, with reference to FIGS. 1 to 3, the structure of the transfer machine, particularly its workpiece loading/unloading station, will be explained.

FIG. 1 is a plan view of a workpiece loading/unloading station of a transfer machine, and FIGS. 2 and 3 are a longitudinal front view and a longitudinal side view of the workpiece loading/unloading station of the transfer machine, showing the state when a transfer jig is loaded.

In the figure, T is the entire transfer machine, C
denotes its work loading and unloading station, J denotes a transport jig, transfer machine T includes a guide rail R that goes around the production line including a machining line (not shown), and the station C provided in front of the machining line. and a workpiece transport jig J that is guided by a guide rail R and is intermittently transferred.
A return conveyor is provided at Rs.

The guide rail R is supported by suitable supports along the main line or branch line, such as left and right posts Pl and Pr for merging the input route Rs, and when looking at the station C, the input route Rs is the length of the jig J. A pair of rails Rsl and Rsr with an interval corresponding to the width dimension of the jig J enter from the return conveyor side (not shown), and at right angles thereto, a main line side rail Rl and Rr with an interval corresponding to the width dimension of the jig J enter the machining line. go out towards
On the machining line, the jig J is transported in a vertical position with the jig J tilted sideways at 90 degrees.

The jig J sent along the input path Rs from the return conveyor has a spring type pay-in arm Al,
Due to the action of Ar and intermediate guide rail Rm, the main line side rail Rl,
When it is placed on the rail Rr and settled in the position shown by the imaginary line in Fig. 1, the limit switch Ls ₁ provided on the rail Rr detects this, and during the clamping operation, the cylinder-driven stop arm Ac is machined. Spring-type stop arm Aa prevents escape to the line side, and prevents escape to the opposite side. When the workpiece clamping operation of the jig J is completed, the stop arm Ac is pulled down, and the spring-loaded push pawl Ps of the cylinder-driven pusher Rc pushes the jig J toward the machining line, and its forward position is controlled by the limit switch Ls. ₂ is now detected.

The station C above is Foundation F.
A box-shaped support base B is installed on top, and a pair of hydraulic lifting cylinders 1 and 2 are placed and fixed on the upper bottom part of the base B1, as seen from the machining line side, and a flat plate is placed on top of the piston rods 1a and 2a. At the same time as attaching the shaft plate 3 horizontally, as shown in FIG.
Place the limit switch 4 at a predetermined level along the bottom of a.
A hydraulic cylinder 6 is fixed horizontally to the rear end of the plate 3, and a hook 7 is attached to the piston rod 6a that projects rearward. .

In addition, push plate 3 and base upper bottom B1
In between, a toggle lock mechanism 8 is provided which functions at the upper limit position of the plate 3, and the unlocking and locking operations are performed by the back and forth movement of the piston rod 9a of the cylinder 9 which is hydraulically interlocked with the cylinder 2.

In addition, as the push plate 3 moves upward, the jig J
Since an upward force acts on the rail Rl, check plates 10 to 12 are provided as a reaction force source to prevent the rail Rl from lifting up.
It is installed horizontally on the upper surface of each intersection of the rail Rr and the opposite part of the input route Rs, so that the jig J can pass through without interference when paying from the input route Rs or moving along the main line R. .

Here, the structure of the workpiece conveyance jig J will be explained with reference to FIGS. 4 and 5.

Fig. 4 is a plan view of the transfer jig showing the state in which the workpiece is clamped, and Fig. 5 is a longitudinal cross-sectional view of the transfer jig taken along line 5-5 in Fig. 4, with the main parts further broken away. It is something.

The conveyance jig J has 1-2 speed and 3-speed as a workpiece.
Shift fork W1, W2, W3 for 4th and 5th speeds
(Hereinafter, referred to generically as W) is used to clamp and transport workpieces along the production line.
a clamp mechanism K for positioning and fixing on 0;
It consists of a link mechanism L for operating the clamp mechanism K from the back side of the pallet 20.

Workpieces W1 to W3 have main shaft portions a1 to a3, respectively.
and fork parts f1 to f3 formed on the sides thereof.
and protrusions p1 to p3, but as shown in the figure, the shapes thereof are different from each other.

The pallet 20 has a main body part 20a that is approximately flat and has a truncated pyramid shape with a gentle ridge line slope, input rail slide parts 20b and 20c located in the front and rear when viewed from the machining line side, and main rail slide parts located on the left and right sides. 20d, 20e, and a pair of front and rear pallet clamp insertion parts 20f and 20g located at the right and left corners.
The upper surface 20h of the surface 0a is finished with high precision to provide a basic level for positioning, and a recess M is formed on the back side to house the link mechanism L to prevent unnecessary interference.

The clamp mechanism K is for each work W1, W2, W3.
Reference seats N1..., N2..., N3 bolted to positions on the upper surface 20h suitable for three-point support of
..., clamp arms 21 to 28 disposed at locations suitable for clamping the workpiece W in cooperation with these reference seats N1 to N3, and arms 21 to 28.
Clamp rods 31 to 38 are fixed with bolts.
, substantially cylindrical rod holders 41 to 48 which are vertically fixed to the pallet main body part 20a from the back side and hold the corresponding rods 31 to 38 so as to be slidable and rotatable in the axial direction; and each of the holders 41 to 48. A square spring is compressed inside and constantly biases the corresponding rods 31 to 38 toward the back side of the pallet 20.
It consists of Sp... Arms 21 to 28 are dedicated to the works W1 and W2, two each, and one shared.
There are 3 dedicated arms for W3, 8 in total, and all of them can move forward and backward together with the corresponding rods 31-38.The common arm 23 is approximately rhombic, and the dedicated arms 21, 22, 24-28 are tapered. It has a planar shape similar to a nail. In the figure, 29 and 30 are natural locks that also serve as vertical cutting reaction force sources in the machining line for the workpieces W1 and W2, respectively.
40 is a jig for positioning the workpiece W3, and 49 is a fixing seat of an elastic clamp for positioning the protrusion p2 of the workpiece W2 from the back side of the pallet 20.

By the way, the above-mentioned clamp mechanism K has an arm 2 as a clamp member that takes charge of the clamping function.
1 to 28 are made to perform clamping/unclamping and evacuation/returning operations in the horizontal position of the pallet 1 shown in FIG.
- 38 is given by the vertical movement and the horizontal turning movement, of which the push plate 3 and the spring Sp share the vertical movement. The link mechanism L controls the turning movement.
The link movement is configured to correspond to the back and forth movement of the hooking pawl 7.

Here, the link mechanism L will be explained by comparing FIG. 6 with FIGS. 4 and 5. FIG. 6 is a plan view of the link mechanism.

The rods 31 to 38 have intermediate portions m... and lower portions 31a to 3, each having a smaller diameter than the upper portion u...
8a, and the lower end of the spring Sp pushed into the holder intermediate part h around each rod intermediate part m is fitted into the upper end of the lower rod parts 31a to 38a.
The rod rotating arm 5 is received at the stopper St of the lower parts 31a to 38a, and the rod is attached to the part of the lower part 31a to 38a that projects downward.
The base portions 51a to 58a of Nos. 1 to 58 are fitted and locked, and are fixed and integrated with the stopper St using screws V, and caps Cp are screwed onto the lower ends of the lower portions 31a to 38a and secured with screws.

Further, as shown in FIG. 4, a hook member 50 having a rectangular shape in plan view is placed between the pallet slide parts 20c and 20c, which also serves as guard blocks, and faces parallel to the rear edge of the pallet main body part 20a. ,
As shown in FIG. 5, a hook groove 50a is formed on the lower surface, and as shown in FIG. They are tightened and fixed and protrude in parallel, and are inserted into corresponding guide holes 20i, 20j, 20k on the rear surface of the pallet main body 20a so as to be slidable back and forth. And each rod 59-61
Tenons 59b to 61 with stepped gills at the tips.
b, into which the base end mortises 59'a to 61'a of the shift rods 59' to 61' are fitted;
The rods 59' to 61' are thus designed to be able to freely move up and down and push and pull back and forth.

In addition, the center rod 60' has a tip that is ``to'' in plan view.
A common connection portion 60'b shaped like a square is provided, and continuous connection portions 60'c and 60'd are formed on the front surface thereof.

Then, the tip portions 59'b,
61'b and the tip portions 51b, 52b of the swing arms 51, 52 are connected to link plates 62, 6, respectively.
3 to connect the first and second link motion L
1, L2, and furthermore, the left connecting portion 60'c of the center shift rod 60', one tip 53b of the pivot arm 53, the other tip 53c of the pivot arm 53, and one tip of the pivot arm 58. 58
b. The other tip 58c of the arm 58 and the tip 55b of the arm 55 are sequentially connected to the link plates 64 to 64.
At the same time, the right connecting part 60'd of the rod 60' and one tip 54b of the swing arm 54, the other tip 54c of the arm 54 and the tip 56b of the arm 56, and the tip 56b of the arm 56 and the tip end 57b of the arm 57 to the link plates 67-6.
9 to obtain third and fourth link motions L3 and L4, respectively, thereby forming a link mechanism L. In the figure, Pn represents a connecting pin.

Therefore, the clamp arms 21 to 28 are integrated with the rods 31 to 38, the stopper St, the cap Cp, and the swing arms 51 to 58, and are attached to the rod holder 4.
1 to 48, the rotating arm 5 moves forward and backward and rotates with respect to the reference seats N1 to N3 and the pallet 20.
1 to 58 are given turning positions corresponding one-to-one to the back and forth movement of the hook member 50, that is, the movement of the hooking pawl 7 engaged with the hook groove 50a, through the link motions L1 to L4. When the hook member 50 is in the forward position X in FIG. 6, the clamp arms 21 to 28 take the operating angular position shown by the solid line in FIG. I come to.

In addition, since each clamp arm 21 to 28 is biased toward the back side of the pallet by a spring Sp, the rotation angle position does not change except when the clamp arms 21 to 28 are forcibly moved up and down by the push plate 3. Regardless of whether it is in the operating position or in the retreat position, it is always at the lower bias limit position, and if we take the operating position in which the jig J holds the workpiece W as an example, the fifth At the clamp position shown in the figure, the lower end of the cap Cp is at the level of lc. In this regard, in the normal state of the jig J, that is, in a state in which it does not hold the workpiece W, its lower biasing limit position will be at a slightly lower level than lc even if it is in the operating position. Hereafter, it shall be represented by lc.

On the other hand, when the push plate 3 is raised and lowered, as the push plate 3 moves upward from the fixed position lo as its lowering limit, it first starts to interfere with the cap Cp at the level of lc, and the spring force of the spring Sp is increased. Therefore, if the clamp arms 21 to 28 are in the operating position, the degree of clamping on the workpiece W is gradually weakened, the workpiece W is unclamped at the level position lu, and the workpiece W is further moved slightly upward from the unclamped position lu. It rises to the upper limit level lh and stops moving here. In the case of the evacuation position side, arm 21~
The difference is that 28 does not interfere with the workpiece W. Then, the arms 21 to 28 are retracted or returned to the workpiece by the catch claw 7, and then the plate 3 starts descending from the upper limit level lh, and after the return rotation, the arms 21 to 28 move to the workpiece W at the level lu. , and completes the clamping at level lc, whereby plate 3 separates from cap Cp and returns to its home position lo.

Here, the structure of the natural lock 30 will be outlined with reference to FIG. Note that the natural lock 29 has the same structure as the natural lock 30, so a description thereof will be omitted.

FIG. 7 is a vertical cross-sectional view of the main part of the conveyance jig along the line 7-7 in FIG. 4.

Natural lock 30 is push plate 3
The lock mechanism 70 consists of a lock mechanism 70 that elastically locks or unlocks the work fork part f2 according to the vertical movement of the work fork part f2, and a housing H thereof.
a pressing pin 71 facing the fork part f2 from the right side;
a pin holder 72 that holds the pin 71 slidably in the axial direction; a horizontal spring 73 that biases the large diameter portion 71a of the pin 71 in the unlocking direction, that is, to the right;
A wedge 74 that comes into contact with the back slope 71b of the pin large diameter portion 71a and slides in the vertical direction, a vertical rod 75 that is integrated with the wedge 74, a rod holder 76 that holds the rod 75 so as to be slidable in the axial direction, and the rod 7.
The rod 75 projects downward from the pallet main body 20a.
Note that when the push plate 3 rises from the home position lo, the lower end 75b of the rod 75 starts to interfere with the plate 3 at the level 11, sets the pin 71 in the unlocked state at the level 12, and causes the plate 3 to move upward. When descending, clamp arm 2 at the level of lc.
After completing the clamp operations 1 to 28, the level l
2 starts the locking operation on pin 71, and the level l
1 completes the lock and leaves the plate 3, which returns to the home position lo.

Here, the operation of the transfer machine T at the station C will be explained with reference to FIGS. 1 to 7.

Now, as an initial state of the jig J, when the transfer cycle of the machine T starts and before the workpiece W is attached, the clamp arms 21 to 28 are still placed at the lower limit position at the angular position shown by the solid line in Fig. 4. think of.

Incidentally, at this time, the hook member 50 naturally
It is in the forward position, and the hooking pawl 7 is also in the corresponding normal position, that is, the rod 6a of the cylinder 6 is in the retracted position.

The jig J in this state is first transferred toward the station C along the input path Rs.

The jig J sent to the station C along the input path Rs is moved to the rails Rl, by the paying arms Al, Ar.
Rr, the corresponding edge slides under the check plates 10 to 12 and is located at the position indicated by the imaginary line in Fig. 1. The limit switch Lsl detects this and prevents the check plate from escaping in the front and rear direction using the stop arms Ac and As. blocked.

Next, hydraulic oil is sent to cylinders 1 and 2 of station C shown in FIG.
a and 2a begin to move upward. Along with this, the push plate 3 is moved to the fixed position lo shown in FIGS. 5 and 7.
It starts to rise more. Incidentally, the passage of oil to the cylinder 2 is carried out in such a manner that the hydraulic oil is removed from the cylinder 9, and therefore the piston rod 9a is retracted.

And at level 11, Natural Rock is 30.
Interference between the rod 75 and the plate 3 (same for 29) begins, and the clamp mechanism K at level lc.
Interference between the rod cap Cp and plate 3 begins. Thus, plate 3 reaches level lh,
The clamp arms 21 to 28 also rise to their upper limit positions, and the claws 7 fit into the hook grooves 50a. This is detected by the upper limit switch 4, and the cylinders 1, 2, and 9 stop operating, and the toggle lock mechanism 8 is activated. do. In the natural lock mechanism 70, the pin 71 moves to the right in FIG. 7 and returns to its home position.

Next, the action of the cylinder 6 displaces the claw 7 rearward, pushing the hook member 50 from the X position to the Y position in FIG. 6, and the action of the link mechanism L moves the arms 21 to 28 at their upper limit positions.
It rotates to the retracted position indicated by the imaginary line in FIG. 4, and thereby the workpiece can be attached to the jig J. In addition, since this explanation is about the time of starting up the transfer, here, the reference seats N1 to N1 of the pallet 20 will be explained.
The installation procedure is to set the workpiece W on N3, but as the cycle progresses, the jig J that unclamped the processed workpiece W is placed on the station C.
When the workpiece W is unclamped due to the retracting movement of the arms 21 to 28, the machined workpiece W is removed from the jig J, and
After that, it is clear that the procedure for attaching a new workpiece W will begin.

After the workpiece W is attached, the piston 9a starts moving forward, the toggle lock is released, and after a slight delay, the piston rods 1a and 2a start lowering, the push plate 3 starts moving downward from level lh, and along with it,
Arms 21 to 28 of clamp mechanism K are square springs Sp
It begins to descend due to the spring force of the natural lock 3.
The pressure pin 71 of 0 is connected to the spring 77 and the wedge 7.
Due to the action of 4, it moves to the left in Figure 7, and first, the level lu
The clamping operation of the workpiece W by the arms 21 to 28 starts at level lc, the clamping is completed at level lc, and the lower end of cap Cp remains in that position, and then the natural locking operation of the workpiece W by the locking mechanism 70 starts at level l2. is completed at level l1, the lower end 75b of the rod 75 remains at position l1, the push plate 3 moves down to the home position lo, and the claw 7 also moves down together with it and leaves the hook groove 50a. The limit switch 5 detects this.

When the workpiece W is clamped and locked in this way, the stop arm Ac is pulled down, the pusher claw Ps of the pusher PC pushes the jig J toward the machining line, and its forward position is set by the limit switch Ls2.
Detect with.

Then, the jig J is raised 90 degrees to take a vertical position, and at each processing station, the workpiece W is machined by an appropriate shaft head Hd. The workpiece is returned to the workpiece loading/unloading station C.

According to this embodiment, the clamp arms 21 to 28
Square spring Sp for biasing in the direction of clamping
Clamp rods 31 to 38 as movable members that integrally interlock with the arms 21 to 28 are provided on the conveyance jig J, while the rods 31 to 38 are attached to the pallet 2.
push plate 3 that unclamps the workpiece W from the arms 21 to 28 by moving up and down from the back side of the
Since this is provided on the workpiece loading/unloading station C, the workpiece W can be loaded and removed by simply moving the plate 3 up and down. Also, Rod 31-3
8 is moved from the back side of the pallet 20, the space on the front side of the pallet 20 can be used effectively, and the arrangement of the clamp arms can be selected at will.

(Effects of the Invention) As is clear from the above description, according to the present invention, in a conveyance jig equipped with a pallet member, a clamp mechanism, and a lock mechanism, the actuation mechanism for clamping and locking the workpiece is provided in the workpiece loading/unloading station. Since the clamp arm is provided and operated from the back side of the pallet member, the space on the front side of the pallet member can be fully utilized, increasing the degree of freedom in the arrangement pattern of the clamp arm and the like.

At this time, the mechanism is simplified because the plurality of clamp rods that press the workpiece are moved upward by pushing up one push plate, and the pressing force on the workpiece is released. Even when changing the arrangement of the arm and clamp rod, only the aspect of the pallet member side needs to be changed.

In addition, in order to retract the clamp arm to a position where it does not interfere with the workpiece, a link mechanism connected to the clamp rod is provided so that multiple clamp arms can be rotated at the same time by moving one hook member back and forth. The clamp arm retraction mechanism can be constructed easily and inexpensively.

[Brief explanation of drawings]

The drawings are of a transfer machine according to an embodiment of the present invention, and FIG. 1 is a plan view of a work loading/unloading station of the transfer machine, and FIGS. 2 and 3 are a vertical front view and a vertical side view thereof. Figure 4 is a plan view of the transport jig showing the state in which the workpiece is clamped, Figure 5 is a vertical sectional view taken along the line 5-5 in Figure 4, Figure 6 is a plan view of the link mechanism, and Figure 7 is FIG. 5 is a vertical cross-sectional view of a main part taken along line 7-7 in FIG. 4; In addition, in the drawing, 3 is a push plate, 20 is a pallet, 21 to 28 are clamp arms, and 31 to 3
8 is a clamp rod, C is a work loading/unloading station, J is a transfer jig, R is a guide rail, Sp is a square spring, T is a transfer machine, W1 to W3
indicates the workpiece.

Claims (1)

[Claims] 1. A jig for clamping and transporting a workpiece;
In the transfer machine, the workpiece loading/unloading station includes a workpiece loading/unloading station for clamping or unclamping the workpiece to the jig, and a guide rail passing through the station, and the workpiece loading/unloading station includes a pair of lifting/lowering cylinder units, and a lifting/lowering cylinder unit. A push plate is integrally connected to the cylinder unit, a toggle mechanism is provided to regulate the upper limit position of the push plate, a horizontal cylinder unit is integrally connected to the push plate, and a hook is provided on the cylinder rod. on the other hand,
The jig is provided with a pallet member running on the guide rail, a clamp arm disposed on the pallet member, a clamp rod coupled to the clamp arm, and an elastic member urging the clamp rod downward. , the clamp rod is movable vertically and horizontally, and the lower end of the clamp rod protrudes from the back side of the pallet member and faces the upper part of the push plate;
A swing arm is fixed to the lower end of the clamp rod, and is connected by a link to a hook member provided at the rear end of the pallet member that can move forward and backward, and when this hook member engages with the hooking claw and moves forward and backward, the clamp arm The transfer machine is characterized in that when the push plate rotates and the push plate moves upward, the clamp arm is pushed up. 2. The transfer machine according to claim 1, wherein the workpiece loading/unloading station is provided with a plurality of check plates for preventing the jig from rising as the push plate rises.