JPS5815302B2 - Restraint type clamping device for injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is disclosed in Japanese Patent Application No. 51-116816
-17699) This relates to an expanded improvement of the invention, and more specifically, the strong pressure mold clamping cylinder moves along the tie bar together with the movable plate, and the transmission rod connected to the cylinder body of the strong pressure mold clamping cylinder is transferred to the second fixed plate. This relates to a restraining type mold clamping device for an injection molding machine that applies a reaction force for strong pressure mold clamping by restraining the mold.

The purpose of this invention is to establish a restraining type mold clamping device of the above type as an expanded improvement of the invention of Japanese Patent Application No. 51-116816 (Japanese Patent Publication No. 55-17699). The essential features are that, for example, the strong pressure clamping cylinder is lightweight and compact, the hydraulic system capacity can be downgraded, and the structure of the strong pressure clamping cylinder can be simplified.

That is, in the restraint type mold clamping device according to the invention of Japanese Patent Application No. 51-116816, a strong pressure mold clamping cylinder is fixed on a bed, and a transmission rod connected to a movable plate is passed through the hollow part of the hollow piston of the strong pressure mold clamping cylinder. , at the front of the hollow piston,
Since the transmission rod is restrained or released from restraint by a restraint mechanism, there are the following disadvantages.

■ The piston stroke of the strong pressure mold clamping cylinder must be the sum of the thickness of one mold thickness adjustment mechanism and the distance it moves synchronously with the high speed movement cylinder. The dimensions in the moving direction become larger, the weight becomes heavier, and furthermore, the capacity of the hydraulic system has to be upgraded.

■ The piston of the high-pressure mold clamping cylinder must have a hollow structure, and the piston shaft of the hollow piston must protrude on both sides of the piston, and each must protrude the required length outward on both sides of the cylinder body. Therefore, in this sense as well, the dimension of the strong pressure mold clamping cylinder in the piston movement direction becomes quite large.

In addition, the structure of the high-pressure mold clamping cylinder is difficult, and oil seals are required for each piston shaft on both sides of the piston.In particular, the pressure receiving surface of the piston that receives hydraulic pressure during mold clamping is calculated by subtracting the piston shaft outside diameter from the piston outside diameter. Since the remaining area is limited and narrow, it is necessary to take measures such as increasing the outer diameter of the piston as much as possible or increasing the hydraulic pressure. It becomes heavier, or the hydraulic system capacity has to be upgraded.

Therefore, the ultimate objective of this invention is to provide a large-diameter, small-stroke, strong-pressure mold clamping cylinder whose cylinder body can move forward and backward along a tie bar, and whose front end of the piston is connected to a movable platen, and which has a movable platen. A high-speed moving cylinder with a small diameter and large stroke that moves forward and backward; a transmission rod that moves forward and backward within the hollow part of a second stationary plate whose front end is connected to the cylinder body of the strong pressure mold clamping cylinder and whose rear end is fixed on the bed; A restraint mechanism installed on the side of the fixed plate facing the cylinder body of the strong pressure mold clamping cylinder and causing a block-shaped restraint element to enter or retreat into a restraint element receiving part of the transmission rod to restrain or release the restraint of the transmission rod. A restraining type mold clamping device comprising: a fixed number of mold thickness adjustment pieces movable in the axial direction of the transmission rod and stored in series in the mold thickness adjustment piece storage portion of the transmission rod; A mold thickness adjustment mechanism is provided, and in the mold thickness adjustment mechanism, when the mold thickness adjustment piece storage parts are distributed to either end face side or both end face sides, the mold thickness adjustment piece storage parts A space between the end face of the mold thickness adjusting piece and the mold thickness adjusting piece or between one adjacent mold thickness adjusting mechanism is formed as a restraining element receiving part, and the mold thickness adjusting mechanism connects each mold thickness adjusting piece to the transmission rod. A restraint-type mold clamping device for an injection molding machine, which has a means for individually restraining the body, or the entire structure of the restraint-type mold clamping device described above is the main part, and the rear surface of the restrainer or the restraint receiver on one or both of the rear surfaces in the forward direction of the transmission rod forming the
A protrusion that allows each surface to partially collide is formed perpendicular to the forward and backward direction of the transmission rod.

An object of the present invention is to provide a restraining type mold clamping device for an injection molding machine, which is characterized by the following.

Next, the present invention will be explained with reference to illustrated embodiments.

Figures 1 and 2 show an injection molding machine to which a restraining mold clamping device is applied, which is an embodiment of the present invention. In particular, Figure 1 shows the restraining mold clamping state, and Figure 2 shows the movable platen retracted. This shows the state in which the

A second stationary plate 2' and a stationary plate 2 are fixed to the left and right sides of the bed 11 of the molding machine, and a tie bar i is installed horizontally between them.
A cylinder main body 6' of a strong pressure mold clamping cylinder 6 with a large diameter and a small stroke and a movable platen 3 are installed so as to be able to move forward and backward along the directions o and io, and the front end of a piston 7 is connected to the movable platen 3.

A plurality of small-diameter, large-stroke, high-speed moving cylinders 8, 8, which move the movable platen 3 forward and backward to open and close the mold, have their cylinder bodies 8' fixed to the second fixed platen 2', and move the tip of the piston rod 9. It is connected to plate 3'.

The movable mold 5 attached to the movable platen 3 is opened and closed with respect to the fixed mold 4 as the movable platen 3 moves back and forth.

In the figure, 1 indicates an ejection nozzle.

The transmission rod 12 has its front end (right end) connected to the strong clamping cylinder 6.
The rear end (left end) is connected to the second cylinder body 6'.
It passes through a hollow part 2a provided to pass through the fixed platen 2' in the left-right direction, and moves forward and backward within the hollow part 2a.

A mold thickness adjustment mechanism C is provided near the left end of the transmission rod 12 over a length range corresponding to the basic stroke necessary for mold thickness adjustment, and a groove-shaped restrainer receiving portion 25 is formed in a part of the mechanism C. There is.

On the other hand, a restraining mechanism for moving the block-shaped restraint 18 into or out of the restraint receiving part 25 and restraining or releasing the restraint on the transmission rod 12 is connected to the cylinder of the strong mold clamping cylinder 6 in the second stationary platen 2'. It is installed on the side facing the main body 6' (right side in the figure).

The restrainer 18 of the restraint mechanism enters the restrainer receiving portion 25 by the chuck cylinder 21 and restrains the transmission rod 12.

With the transmission rod 12 thus restrained, the strong pressure mold clamping cylinder 6 presses the movable platen 3 to clamp the molds 4 and 5.

The configuration of the mold thickness adjustment mechanism C, which sets the basic stroke according to the change in mold thickness during mold change, is as follows.

A concave mold thickness adjustment piece storage part is formed in a predetermined range of the transmission rod 12 by turning, leaving a small diameter part 22 with a cross-sectional area that can withstand mold peeling force (tensile force) (Figs. 4 to 6). ).

Therefore, the total length of the small diameter portion 22, that is, the length t of the mold thickness adjustment piece storage section minus the receiving width t1 (see Fig. 2) of the restrainer receiving portion 25 is the length of the mold thickness adjustment piece 15. This is the most basic stroke of the dog that can be adjusted by...

The small diameter portion 22 is provided with two smooth surfaces 14, 14 for moving the pieces, which are chamfered parallel to the longitudinal direction thereof (see FIGS. 4 and 7).
Figure A), and the piece moving smooth surfaces 14, 14 are approximately 9
At the part separated by 0°, one mold thickness adjustment piece 15 has a length t.
2. At the same pitch, stopper 16 of mold thickness adjustment piece 15
A stopper groove 73 into which the stopper is fitted is provided.

The depth of the stopper groove 13 is such that when viewed in the cross section shown in FIGS. 6 and 7, the smooth surfaces 14, 14 for moving the pieces form a substantially square cross section.

A constant number of mold thickness adjustment pieces 15 are arranged on the small diameter portion 22 of the transmission rod 12.
The transmission rod 12 is movable in the axial direction like a Hesoroban ball, and
They are arranged in series and cannot be removed, and are housed in the mold thickness adjustment piece housing.

Therefore, there is no need to prepare the required number of mold thickness adjustment pieces 15 each time the mold thickness adjustment work is performed, or to store, organize, and care for unnecessary pieces.

The shaft hole of the mold thickness adjustment piece 15 is completely circular, and its inner diameter is necessary to allow it to slide freely in the circumferential direction and axial direction of the small diameter part 22, similar to the Soroban ball, with respect to the outer diameter d of the small diameter part 22. I treat it like a dog.

The outer diameter of each mold thickness adjustment piece 15 is equal to the outer diameter D of the transmission rod 12).

As described above, the restrainer receiving section 25 can be used when each mold thickness adjustment piece 15 is distributed to either the left or right end surface side of the mold thickness adjustment river piece storage section or to both end surface sides. It can be formed as a space between the end face of the mold thickness adjustment piece storage section and the mold thickness adjustment piece 15, or between adjacent mold thickness adjustment pieces 15.

Therefore, the total length t of the small diameter portion 22 in the axial direction is an integral multiple of the thickness dimension t2 of the mold thickness adjustment piece 15.

When the relationship between the thickness dimension t2 of the mold thickness adjustment piece and the receiving width dimension t1 of the restrainer receiving portion 25 is, for example, t1-3t2, one mold thickness adjustment piece 15 is moved during mold thickness adjustment. This means that the basic stroke has been changed by a dimension equivalent to 1/3t1.

Therefore, the larger the multiple ratio between the two, the more finely the mold thickness can be adjusted.

Each mold thickness adjustment piece 15 is used to individually restrain the transmission rod 12, that is, to mechanically determine the position of the moved mold thickness adjustment piece 15, and in turn, to determine the position of the restrainer receiving portion 25. In order to ensure proper fixation, a stopper 16 that fits into the previously described stopper groove 13 is built-in.

As shown in FIGS. 5 to 7, the stopper 16 is built in so as to protrude toward the shaft hole of the mold thickness adjustment piece 15, and a suppression spring 17 is installed behind it to provide a protruding force. There is.

The stopper 16 built in the mold thickness adjustment piece 15 that participates in forming the restrainer receiving portion 25 normally fits into the stopper groove 13 as shown in FIG. 7A, and stops the mold thickness adjustment piece 15.

The diameter or thickness of the stopper 16 and the stopper groove 13
The groove width dimension is a configuration that does not cause any positional error of the mold thickness adjustment intermediate piece 15, which is finished and restrained with a fitting tolerance.

Note that the pressing spring 17 that constantly presses the stopper 16 toward the small diameter portion 22 can be replaced with a compressed gas suppressing action.

For example, as shown in FIG. 30A, a flexible container or hollow ball 50 filled with compressed gas is installed behind the stopper 51, or as shown in FIG. 30B, the stopper 52 is connected to a round rod. Similar effects can be expected by forming a piston structure in which a circumferential groove is provided on the circumferential surface and an O-ring 53 is installed in the structure, and compressed air is supplied to the cavity 54 behind the stopper 52. can.

This point is common to other mold thickness adjustment mechanisms described below.

Although not shown in the drawings, it is also possible to implement a configuration in which each mold thickness adjustment piece 15 has a built-in push screw as a different means for restraining the mold thickness adjustment piece 15.

In that case, it is convenient to provide a groove along the axial direction of the small diameter portion 22 of the transmission rod 12, through which the push screw advances and retreats.

A method of adjusting the mold thickness using the mold thickness adjusting mechanism described above and its operation will be explained.

When the stopper 16 is fitted into the stopper groove 13 of the small diameter portion 22 as shown in FIG. 7A, the mold thickness adjustment intermediate piece 15 is in a state where its rotation and movement in the axial direction are restrained.

Therefore, when the mold thickness adjustment intermediate piece 15 is taught the necessary strength of rotational force, the stopper 16 follows the change in the rotation radius of its tip surface and retreats while compressing the pressing spring 17, moving the stopper groove 13 in the rotation direction. Since it slides, the mold thickness adjustment middle piece 15 can be rotated.

FIG. 7B shows a state in which the mold thickness adjustment middle piece 15 has been rotated approximately 45 degrees.

FIG. 7C shows a state in which the mold thickness adjusting middle piece 15 is rotated by 90 degrees.

That is, the stopper 16 is connected to the piece moving smooth surface 1 of the small diameter portion 22.
4, the stopper 16 does not interfere with the movement of the small diameter portion 22 in the axial direction, so the middle die thickness adjustment piece 15 can be freely moved in the axial direction of the small diameter portion 22.

When the mold thickness adjustment middle piece 15 is moved by one piece, the restrainer receiving part 25
The position changes by the thickness dimension of 151 mold thickness adjustment mechanisms.

Therefore, the change in the basic stroke accompanying the mold change is achieved by moving the required number of mold thickness adjustment intermediate pieces 15 in the axial direction in the manner described above.

Then, the moved mold thickness adjustment intermediate piece 15 is rotated again by about 90 degrees in either direction at the arrival position.

Then, the mold thickness adjustment piece 15 has a built-in middle piece stopper 1.
6 fits into the stopper groove 13 at the relevant position, and as shown in FIG. 7A again, the rotation and movement in the axial direction are stopped.

As mentioned above, the necessary stroke of the piston 7 of the strong pressure mold clamping cylinder 6 in this mold thickness adjustment mechanism C is necessary if it is the same as the thickness t2 of one mold thickness adjustment piece 15. It is sufficient and no further large strokes are required.

In other words, regardless of whether the mold thickness change is more than or less than the thickness of one or more mold thickness adjusting pieces 15, if the fraction is compensated for by the stroke of the piston 7, the purpose of mold thickness adjustment can be completely achieved. This is because it reaches .

Therefore, the stroke can be made sufficiently small, and the size of the strong pressure mold clamping cylinder 6 can be reduced.

Next, the restraint mechanism will be explained.

The restraint mechanism moves the block-shaped restraint member 18 into or out of the restraint receiving part 25 formed by the mold thickness adjustment mechanism C in the Mitatsu rod 12, thereby restraining and releasing the restraint on the transmission rod 12. Yes, the opposite surface side (first
It is installed on the right side in Figure 2).

That is, a pair of upper and lower chuck cylinders 2L 21 is fixed to the right side of the second fixed plate 2' with the transmission rod 12 at the center, and the piston rod tip of this chuck cylinder 21 enters the restrainer receiving part 25. A block-shaped restrainer 18
is installed.

As shown in FIG. 3, the restrainer 18 is restrained on both sides by L-shaped guides 20, 20 fixed to the right side of the second stationary platen 2', and its movement is guided.

Details of the restrainer 18 are shown in FIG.

The thickness dimension t3 of the restraint element 18 is precisely finished with the smallest possible fitting tolerance to the limit of the freedom to move forward and backward relative to the bone width dimension t1 of the restraint element receiving part 25.

If the thickness dimension t3 of the restrainer 18 is considerably smaller than the bone width dimension t1 of the restrainer receiving portion, although the restraint 18 that has entered the restrainer receiving portion 25 serves the purpose of restraint, (1
This is because a loss in operation occurs due to the dimensional difference of 1-13).

As shown in FIGS. 8B and 8C, the distal end surface of the restrainer 18 is provided with a semicircular concave surface 18a having a radius equal to or slightly larger than the small diameter portion 22 of the mold thickness adjustment mechanism C, and a front surface 18e.
Approximately half of the thickness of the restrainer 18 from the side (however, this is not limited to this).

) is provided with an arcuate concave surface 18b having the same radius as the outer diameter of the transmission rod 12.

However, the four arcuate surfaces 18b do not necessarily have to be arcuate.

Thus, the shape of the distal end surface of the restrainer 18 is such that, as shown in FIG.
A step-like protrusion ζ is formed with respect to b, and thus a protrusion 18c is formed.

This protruding portion 18c extends in the forward and backward direction of the transmission rod 12 (see FIG.
The restrainer receiving portion 25 is formed as a portion that protrudes in a direction perpendicular to the left-right direction in FIG. 2 and includes the rear surface 18d of the restrainer 18 (FIG. 8A).

Rear side surface 25a of the transmission rod 12 in the forward direction (FIG. 9A)
As a result, the projection 18c completely restrains the transmission rod 12, thereby achieving the purpose of eliminating downtime in the molding operation of the entire molding machine.

The dimension range f is such that when the restrainer 18 is introduced into the restrainer receiving portion 25 during the mold closing process, the arcuate concave surface 18b of the restrainer 18 is first placed on the front side in the forward direction of the transmission rod 12 as shown in FIG. 9A. The mold thickness adjusting arm 15 (or the transmission rod 12 may also be used) forming the surface 25b (FIG. 9B).

) is designed to allow enough time for a two-step operation in which the protrusion 18c is brought into contact with or immediately before contact with the outer diameter surface of the restrainer receiving portion 25, and then the protrusion 18c is reliably and completely entered into the restrainer receiving portion 25. be done.

In the illustrated example, the restrainer 18 has a configuration consisting of a pair of upper and lower chuck cylinders 21, 21 driven by a pair of upper and lower chuck cylinders 21, but the restrainer 18 does not necessarily have to be provided as a pair of upper and lower parts. Not limited to.

For example, as shown in FIG. 28, a restrainer 18' may be formed of a single block having an inverted U-shaped notch 18a' deep enough to escape the small diameter portion 22.

However, in the case of the restrainer 18.18 consisting of a pair of upper and lower
This is excellent in the sense that the transmission and reception of force in relation to the transmission rod 12 is well-balanced and averaged throughout.

On the other hand, the restrainer 18' consisting of one hook is advantageous in terms of control since only one chuck cylinder 21 is required and only one forward position detection signal of the restrainer 18' needs to be checked. .

Next, the operation of the restraint mechanism to restrain or release the restraint on the transmission rod will be explained.

The mold closing process of aligning the movable mold 5 with the stationary mold 4 is performed mostly by the high-speed moving cylinder 8 at a moving speed of 50 I.
The mold is closed at a high speed of approximately 2.5 m/min, and at a stroke of approximately 70 mm just before the mold closing is completed, the mold is closed at a low speed of approximately 2.5 m/min.

At this time, the strong pressure mold clamping cylinder 6 remains stopped.

When the movable mold 5 moves in the mold closing direction, the strong pressure mold clamping cylinder 6 and the transmission rod 12 connected to the movable platen 3 also move together.

On the other hand, the restraint receiving part 25 in the mold thickness adjustment mechanism C of the transmission rod 12 approaches the restraint 18 which is stationary.
When the protruding portion 18c of the restrainer 18 reaches a position where it can enter into the restrainer receiving portion 25 (for example, the relative position shown in FIG. 9A), the position is detected in advance by a position detection mechanism (not shown) (such as a limit switch). Then, the chuck cylinder 21 is activated based on the position detection signal, and the arcuate concave surface 18 of the restrainer 18 is
The mold thickness adjusting arm 15 is advanced to a position just before or slightly in contact with the outer diameter surface of the mold thickness adjusting arm 15 (FIG. 9A).

The protruding portion 18c that has entered the restrainer receiving portion 25 thus remains stationary, and on the other hand, the restrainer receiving portion 25 moves forward together with the transmission rod 12, so that the rear surface 25a forming the restrainer receiving portion 25 is the protruding portion of the restrainer 18. This results in a collision with the rear surface 18d of 18c (Fig. 9B).

At the same time, the mold closing movement of the transmission rod 12 and the strong pressure mold clamping cylinder 6 is terminated by the force of the restrainer 18 restraining the rear surface 18d.

On the other hand, the high-pressure mold clamping cylinder 6 is still in a rest state, and both the front and rear chambers of the piston 7 have their hydraulic circuits open.

Therefore, the piston 7 follows the mold-closing movement of the movable platen 3 without much resistance to the movement of the movable platen 3 by a slight (nearly zero) remaining mold closing stroke.

The movement of the piston 7 is confirmed by a detection mechanism (limit switch, etc.), and based on the detection signal, the chuck cylinder 21 is activated again, the restraint member 18 is advanced deeper into the restraint member receiving portion 25, and the restraint member 18 and the restrainer receiving portion 25, that is, complete restraint of the transmission rod 12 by the restraint mechanism is achieved (FIG. 1).

On the other hand, in response to the completion signal of the restraint and the signal that the movable mold 5 has contacted the fixed mold 4, the strong pressure mold clamping cylinder 6 is activated.

As a result, the strong pressure mold clamping cylinder 6 performs the pressure increasing process and the strong pressure mold clamping process while applying a reaction force to the second stationary plate 2' through the transmission rod 12.

The high-speed moving cylinder 8 is stopped at the same time as the strong pressure mold clamping cylinder 6 is started.

When the strong pressure mold clamping process is finished, the process moves from a mold peeling process to a mold opening process to take out the molded product, and the operational modes of this process change can be roughly divided into three types.

In the first operation mode, the restrainer 18 is released from the restrainer receiving part 25 before the mold peeling process to release the restraint, and the mold peeling process and the mold opening process are performed only by the high-speed moving cylinder 8. In the second operation mode, the mold peeling process is performed by the strong pressure mold clamping cylinder 6, and the subsequent mold opening process is performed by switching to the high-speed moving cylinder 8, and immediately before the switching, the restraint element 18 is detached from the restraint element receiving part 25 at once. The third operation mode is the second operation mode, and as a method for disengaging the restrainer 18,
The content is to bring the force transfer relationship between the restraint element 18 and the restraint element receiving part 25 into an unloaded state and to separate them.

The first operation mode described above is a prerequisite that the high-speed moving cylinder 8 generates the force necessary for mold separation, and therefore the piston diameter becomes large and the moving speed is forced to decrease. The mold peeling process and the mold opening process can be performed only by controlling the hydraulic circuit of the moving cylinder 8, which is the simplest method.

However, in the case of the second operation mode, when the mold peeling signal is input, the piston 1 is placed in the right chamber of the piston of the high-pressure mold clamping cylinder 6.
High pressure oil corresponding to 1 separation force is supplied.

Therefore, the movable platen 3 moves to the left, and the mold is peeled off with the molded product attached to the movable mold 5 for a stroke of about 20 mtn.

When the end of the mold peeling process is detected and the strong pressure mold clamping cylinder 6 is stopped, the high-speed moving cylinder 8 switches to the opening process, and the restraint element 18 is removed from the restraint element receiving part 25 at once, and the restraint is released. becomes.

Here, the movement of the restraint mechanism to retreat the restraint element 18 from the restraint element receiving part 25 and release the restraint on the transmission rod 12 will be described in some detail.

When the strong pressure mold clamping cylinder 6 is stopped, the chambers before and after the piston 7 are communicated through the return oil passage of the switching valve (not shown), so the resistance to moving the piston 7 to the left is reduced by the piston 7. It can be said that there is only a sliding resistance between the cylinder body 6' and the cylinder body 6', and it is not very large.

This resistance force is the entire force transferred and received in the relationship between the restraint element 18 and the restraint element receiving part 25, and is the force that causes slip resistance when the restraint element 18 is released, but as mentioned above, it is a large force. Since it is not a force, the restrainer 18 can be easily removed with a slight force.

However, when the restraint element 18 is removed from the restraint element receiving part 25, the restraint element 18 that belongs to the side of the second fixed platen 2 and remains stationary;
As a sliding resistance force of the piston 7 pushed leftward by the high-speed moving cylinder 8, the cylinder body 6' and the transmission rod 12
Due to the force directed to the left in the figure transmitted through the front surface 18e of the restrainer 18 and the front surface 25b (
8, 9) are in contact with each other to transmit and receive the force, and therefore, at the final moment of detachment, the corner of the front surface 18e of the restrainer 18 and the restrainer receiving portion 25 front side 25
Strictly speaking, the corners of b are in the form of a line contact where they touch each other, and all of the force transferred and received as described above is concentratedly applied to both corners, and in some cases, both corners Some consideration must be given to the possibility of damage to the

On the other hand, the content of the third operation mode is as follows:
This eliminates the need to take into consideration the concentration of the load on the corner portions of both when the holder is released from the restrainer receiving portion 25. In other words, the signal input detects the end of the mold peeling process by the strong pressure mold clamping cylinder 6. Even if this occurs, the high-pressure mold clamping cylinder 6 continues to perform a low-speed mold opening process, and during this time, the first stage disengaging operation of the restrainer 18 is performed.

The first stage detachment operation here means that the arcuate concave surface 18b of the restrainer 18 is located outside the outer diameter surface of the transmission rod 12, and the protrusion 18c still remains in the restrainer receiving part 25 to transfer and receive force. means the operation up to the state where it continues.

In this case, for the mold opening process using the strong pressure mold clamping cylinder 6, the tensile reaction force is applied by the second fixed platen 2' through the transmission rod 12 and the restrainer 18 in the restrainer receiving part 25. That is, the rear surface 18d of the restraint element 18 and the rear surface 25a forming the restraint element receiving part 25 are in contact with each other to transmit and receive force.

Therefore, when the front surface 18e of the restraint element 18 comes out of the restraint element receiving part 25 as the first stage detachment operation, the restraint element receiving part 25
There is no problem of power transfer in relation to the front surface 25b of 5.

Upon receiving the signal input to complete the first stage detachment operation of the restrainer 18, the strong pressure mold clamping cylinder 6 is stopped and the high speed moving cylinder 8 is activated to switch to the mold opening process using the high speed moving cylinder 8. The release operation of the restrainer 18 is continued.

In this case, a relative displacement occurs between the stationary restraint member 18 and the leftward moving restraint member receiving portion 25, so that the front surface 25b of the restraint member receiving portion 25 approaches the stepped portion of the restraint member 18.

Relative displacement of the front surface 25b is allowed only within the dimensional range f of the arcuate concave surface 18b of the restrainer 18.

Therefore, if the protruding part 18c is controlled to completely separate from the restraining element receiving part 25 before the front surface 25b of the restraining element receiving part 25 collides with the protruding part 18C of the restraining element 18, the restraining element 18 (
! :Restrictor receiving portion 25 (!:) The transmission rod 12 is released from the restraint in a state where the force relationship is completely released and there is no load.

As a modification of the third operation mode, both the strong pressure mold clamping cylinder 6 and the high speed moving cylinder 8 are activated and used together from the beginning of the mold peeling process, and even after the mold peeling process is completed, the strong pressure mold clamping cylinder 6 continues to operate. 6 and the high-speed moving cylinder 8 move to a low-speed mold opening process using synchronous speeds.

At this stage, the restrainer 18 is caused to perform a first-stage detachment operation, and when a signal indicating completion of the first-stage detachment operation is received, the strong pressure mold clamping cylinder 6 is stopped.

Then, the high-speed moving cylinder 8, which is continuing the low-speed mold opening process,
, a relative displacement occurs between the restrainer 18 and the restrainer receiving part 25, and the front surface 25b of the restrainer receiving part 25 moves closer to the restrainer 18.
The relationship is such that it approaches the protrusion 18c.

Therefore, before the front surface 25b of the restrainer receiving part 25 collides with the protruding part 18c of the restraint child 18, the restraint child 18 is moved to the restraint child receiving part 2.
If the restraint member 18 and the restraint member receiving portion 25 are controlled to completely separate from the restraint member 5, the restraint will be released while the force relationship is completely released.

When implementing this operation mode, in the low-speed mold opening process, the high pressure mold clamping cylinder 6 and the

Although it is desirable to synchronously control the piston speed of the fast-moving cylinder 8, the speed of the strong-pressure mold-clamping cylinder 6 is set to be slightly faster than the speed of the high-speed moving cylinder 8, so that the rear surface 25a of the restrainer receiving part 25 By controlling the rear surface 18d to be pushed to some extent, the above purpose can be achieved even better.

In the case of the restraint type mold clamping device of this embodiment described above, the reaction force of the mold clamping force generated by the high pressure mold clamping cylinder 6 is applied through the area obtained by subtracting the cross sectional area of the small diameter portion 22 from the cross sectional area of the transmission rod 12. In other words, since the ratio of the effective area for transmitting the clamping reaction force to the total cross-sectional area of the transmission rod 12 is large, it is possible to make the transmission rod 12 relatively small in diameter.

The mold thickness adjustment mechanism C described above also includes a strong pressure mold clamping cylinder 6.
Because the stroke required for the piston 7 can be reduced,
As a result, the size of the strong pressure mold clamping cylinder 6 can be reduced.

Next, various examples of different configurations regarding the mold thickness adjustment mechanism will be explained.

(Mold Thickness Adjustment Mechanism Part 2) The mold thickness adjustment mechanism shown in FIGS. 10A to 10F includes a transmission rod 12 that transfers a constant number of mold thickness adjustment middle pieces 15 to a small diameter portion 22 that forms a mold thickness adjustment middle piece storage portion. ..., each mold thickness adjustment middle piece 15 has a built-in stopper 16' pressed by a suppression spring 17', and the stopper groove 13a is a groove cut in the tangential direction of the small diameter part 22, and 22 is provided at a constant pitch in the axial direction, which is common to the configuration of the above embodiment.

The feature of this mold thickness adjustment mechanism is that each mold thickness adjustment piece 15, the stopper 16', the rear end 12' of the transmission rod 12, and the end face of the transmission rod on the right side of the small diameter part 22 have the same diameter through which the Kanzashi rod is passed. holes 12a, 12b, 15a, and 16a are provided respectively, and a single straight kanzashi stick 23 common to these holes is provided.
The point is in the structure that allows it to penetrate.

The tip of the Kanzashi stick 23 is a sharp end 23 that is sharpened into a conical shape.
It is set as a.

Hole 16a of stopper 16' fitted into stopper groove 13a
and the hole 15a of the mold thickness adjustment intermediate piece 15, the center position of each is eccentric to a greater extent than the depth at which the stopper 16' enters the stopper groove 13a, and each stopper 16' is offset from the pressure spring 17' at the rear. It is configured such that it is always pushed toward the small diameter portion 22 (FIG. 10A).

Therefore, when adjusting the mold thickness, when the needle rod 23 is inserted from the rear end 12' of the transmission rod, its sharp end 23a connects the hole 16a of the eccentric stopper 16' to the hole 15 of the mold thickness adjustment middle piece 15.
It advances while being pulled up to a position concentric with a, and finally all the stoppers 16' are pulled up to form the 10th-B shape.

That is, as is clear from the pairwise comparison between E and F in FIG.
3a, and all of the middle mold thickness adjustment pieces 15 can be freely moved in the axial direction of the small diameter portion 22.

Then, move the mold thickness adjustment middle piece 15 as desired (10th
Afterwards, when the bar 23 is pulled out, the stopper 16' fits into the stopper groove 13a again, and the mold thickness adjustment piece 15 is firmly stopped (Fig. 10D). In other words, this mold thickness adjustment mechanism In this case, there is no need to rotate the mold thickness adjustment piece 15 at all, and all the stoppers 16' can be pulled up at once by inserting the bar 23, which has the advantage of facilitating adjustment.

(Mold Thickness Adjustment Mechanism Part 3) The mold thickness adjustment mechanism shown in Figures 11A to D is a modification of the mold thickness adjustment mechanism shown in Figure 10, and requires the work of inserting and pulling out the Kanzashi stick each time the mold thickness is adjusted. This is an improved configuration that eliminates the need for

That is, the Kanzashi stick 23, the pieces 15 for adjusting the thickness of each mold at all times.
... and the stopper 16'... are attached to the transmission rod 12 in such a manner that they pass through them.

The stopper 16' is located in the stopper groove 1 on the bar 23'.
Notch 23a with a depth greater than the depth of entry into 3a
has been established.

Therefore, as shown in FIGS. 11A-C, the kanzashi stick 23'
When the notch 23a faces outward, the pressing spring 17
The upper part of the hole of the stopper 16' pushed into the notch 23a, and therefore the inner end of the stopper 16' fits into the stopper groove 1
3a, and thereby the mold thickness adjustment middle piece 15 is stopped.

The notches 23a are provided at the same pitch as the thickness of the mold thickness adjustment middle pieces 15 as shown in the example shown, and also when the cutouts 23a are provided at the same pitch as the thickness of the mold thickness adjustment middle pieces 15.
3' may be provided as a common plane continuous in the axial direction.

The restrainer 18 related to this mold thickness adjustment mechanism is used when restraining (the restrainer receiving part 2
It is necessary to provide a notch shaped to avoid interference with the Kanzashi stick 23' when entering the Kanzashi bar 23'.

A corner 23b to which a turning tool such as a box spanner can be attached is provided at the outer end of the bar 23'.

In order to adjust the mold thickness from the state shown in FIG. 11A using this mold thickness adjustment mechanism, first rotate the Kanzashi rod 23' by about 180 degrees.

Then, the notch 23a of the bar 23' faces downward, and the stopper 16' is pushed up, so that the position shown in FIG.
, D, the stopper 16' is connected to the stopper groove 13.
It is removed from the position a°, and the middle die thickness adjustment piece 15 can be moved in the axial direction of the small diameter portion 22.

(Mold Thickness Adjustment Mechanism No. 4) The mold thickness adjustment mechanism shown in FIG. 12 is similar to the one shown in FIG. The structure is characterized by using a tension spring 17'' instead of the pressure spring 17' shown in the figure.

That is, the tension spring 17' is placed behind the stopper 16' (7).
The bar 23' has a notch 233 as a common plane that continues in the axial direction.
' is provided.

In the case of this mold thickness adjustment mechanism, normally, as shown in FIGS. 12A and 12B, the Kanzashi bar 23' is in a state with its notch 23a' facing outward, and the bar 23' is placed in a state in which the notch 23a' is directed outward against the action of the tension spring 17''. The stopper 16' is pushed into the stopper groove 13a to stop the die thickness adjustment middle piece 15.

To adjust the mold thickness, first adjust the kanzashi stick 23' to approximately 18
Rotate 0° and insert the notch 233' into the small diameter part 2 of the transmission rod.
Point in two directions.

Then, each stopper 16' is pulled up by the tension spring 17' until it hits the notch 238'.

As a result, the inner end of the stopper 16' separates from the stopper groove 13a, and each mold thickness adjustment intermediate piece 15 can be moved in the axial direction of the small diameter portion 22.

(Mold Thickness Adjustment Mechanism Part 5) The mold thickness adjustment mechanism shown in FIGS.
The middle mold thickness adjustment pieces 15 are provided at the same pitch as the thickness dimension, and each mold thickness adjustment middle piece 15 is provided with a suppression spring 17 in its radial direction.
The present invention is characterized in that a pin-shaped stopper 16 is installed which is pressed by the pin-shaped stopper 16 and inserted into the stopper groove 13b.

The outer end of the pin-shaped stopper 16 is provided with a corner 16b to which a turning tool such as a box spanner can be attached, and the inner end is provided with a slope 16c for escape from the stopper groove 13b.

In this mold thickness adjustment mechanism, the mold thickness adjustment to change the position of the restrainer receiving part 25 from the position shown in FIG. 13A to the position shown in FIG. Rotate 16' by 180' (Fig. 13B),
Push the mold thickness adjustment middle piece 15 strongly in the direction of the arrow in FIG. 13C.

Then, the slope 16c of the pin-shaped stopper 16' overcomes the edge of the stopper groove 13b with relatively small resistance.
The mold thickness adjustment piece 15 can be moved in the direction of the arrow in the third middle piece.

Moreover, conveniently, the pin-shaped stopper 16' of the mold thickness adjustment middle piece 15 that has been moved to the target position? t. As shown in Figure 13, when moving in the opposite direction, the right angle part hits the edge of the stopper groove 13b, and it is impossible to move it as it is, that is, it is impossible to go back. never.

In order to smoothly move the mold thickness adjusting arm 15 and position and stop it by the pin-shaped stopper 16', the stopper groove 13
b is preferably provided at a position on the axial direction of the small diameter portion 22.

(Mold Thickness Adjustment Mechanism Part 6) The mold thickness adjustment mechanism shown in FIG. 14 is a modification of the mold thickness adjustment mechanism shown in FIG.
As shown in FIG. F, one end of the small diameter portion 22 in the tangential direction is provided in the shape of a key to be opened, and a stepped portion 13c' as a stopper is provided on the non-released side.

On the other hand, a pin-shaped stopper 16' is pressed by a pressing spring 17.
The tip part is formed as a simple right-angled part around its entire circumference.

In order to adjust the mold thickness with this mold thickness adjustment mechanism, a rotational force is applied to the mold thickness adjusting arm 15, and the pin-shaped stopper 16 is rotated in the direction of the open end of the stopper groove 13c (Fig. 4E).
(alpha direction) until it comes off.

When the pin type stopper comes off the 16 second stopper groove 13c,
The mold thickness adjustment piece 15 can be moved in the axial direction of the small diameter portion 22, and the mold thickness adjustment arm 15 that has been moved to the target position is now moved in the opposite direction (Fig. 14). In the β direction of E), the pin-shaped stopper 16' is inserted into the stopper groove 13c.
Rotate until it hits the stepped portion 13c'.

By repeating the same operation for the mold thickness adjustment arm 15, the position of the restrainer receiving part 25 can be adjusted, for example, to the first position.
The position shown in FIG. 4A-B can be changed to the position shown in FIG. 4C-D.

(Mold Thickness Adjustment Mechanism Part 7) The mold thickness adjustment mechanism shown in FIG.
2 is provided with a stopper groove 26 through the arcuate cam concave surface, and each die thickness adjusting arm 15 has an eccentric cam stopper 24 built into the stopper groove 26 that can move toward and away from the stopper groove 26.

The cam shaft 24a of the eccentric cam stopper 24 projects in the lateral direction of the mold thickness adjusting arm 15 (FIG. 15 EF), and its outer end is formed into a flat corner portion 24b to which a turning tool can be attached.

In the mold thickness adjusting arm 15, a space 24c having a size that allows the eccentric cam stopper 24 to rotate about the camshaft 24a is provided in the portion housing the eccentric cam stopper 24.

In the mold thickness adjustment mechanism described above, in order to change the position of the restrainer receiving portion 25 from FIG. 15A-B to FIG. 15C-D, first move the cam shaft 24a of the mold thickness adjustment arm 15 to be moved. Rotate approximately 180°.

Then, the eccentric cam stopper 24, which had been press-fitted to the stopper groove 26, separates from the stopper groove 26, and each mold thickness adjustment piece 15 becomes movable.

Then, after moving the necessary mold thickness adjusting arm 15 and moving the last mold thickness adjusting arm 15, the eccentric cam stopper 24 is moved into the stopper groove 2 by rotating its camshaft 24a and 180° in either direction. Crimp it inward.

In this way, all the intermediate mold thickness adjustment arms 15 that have been moved can be stopped in common.

In addition, in the case of the mold thickness adjustment mechanism shown in FIGS. 4 to 6 or shown in FIGS. 10 and 15, the stopper groove is a spherical groove with a relatively gentle curvature, and the stopper fitted therein is The same objective can be achieved by forming the fitting portion into a spherical shape corresponding to the groove.

(Mold Thickness Adjustment Mechanism No. 8) The mold thickness adjustment mechanism shown in FIG. A stopper groove 27 having a concave arcuate surface is provided, and each mold thickness adjusting arm 15 has a built-in disc stopper 28 that is press-fitted to the stopper groove 27.

The disk stopper 28 is housed in a space 28c provided in the radial direction of the mold thickness adjusting arm 15, and its shaft 28a is pushed toward the small diameter portion 22 by a compression spring 28b.

The shaft hole 28d that holds the shaft 28a is an elongated hole in the radial direction of the mold thickness adjusting arm 15, as shown in Figure 16.

In this mold thickness adjustment mechanism, in order to change the position of the restrainer receiving portion 25, first, a strong rotational force is applied to the mold thickness adjustment arm 15 to be moved and the arm is rotated.

Then, the disk stopper 28 built into the mold thickness adjusting arm 15 is displaced outward against the pressing spring 28b, and finally escapes from the stopper groove 27 as shown in FIG. 16C.

When the state shown in FIG. 16C is reached, each die thickness adjusting piece 15 can be freely moved in the axial direction of the small diameter movable member 2.

The mold thickness adjusting arm 15 that has been moved to the target position rotates again at that position.

Then, the disc stopper 28 moves into the stopper groove 27 at the relevant position.
He gets stuck in it and is stopped.

(Mold Thickness Adjustment Mechanism No. 9) The mold thickness adjustment mechanism shown in FIGS. 17A to 17D is characterized by having a configuration in which the mold thickness adjustment middle piece is stopped by a kanzashi bar.

That is, the middle piece 15 for adjusting the thickness of each mold is common, and the small diameter part is
A single Kanzashi stick 3 with a circular cross section that penetrates parallel to the
0 is rotatably supported by passing from the rear end 12 of the transmission rod to the end surface of the transmission rod on the right side of the small diameter portion 22.

The kanzashi rod 30 is immovable in its axial direction, and its left end protrudes leftward from the rear end 12' of the transmission rod 12, and is formed into a flat corner portion 30b to which a turning tool such as a spanner can be attached. .

On the Kanzashi bar 30, at a common position when viewed from a cross section perpendicular to the axis thereof, and at a position with the same pitch as the thickness dimension of the mold thickness adjustment middle pieces 15 in the axial direction of the Kanzashi bar 30, A large number of stopper grooves 30a are provided.

On the other hand, each mold thickness adjusting middle piece 15 is pushed by a compression spring 32 at the back, and a stopper 31 moves toward and away from the Kanzashi rod 30.
Built-in.

The built-in part of the stopper 31 is located in the stopper groove 3 of the kanzashi rod 30.
0a, and stops the mold thickness adjustment middle piece 15.

In this mold thickness adjustment mechanism, in order to change the position of the restrainer receiving portion 25 from the position shown in FIG. 17A to the position shown in FIG. 17, first, the bar 30 is turned about 180 degrees (FIG. 17B).

Then, the stopper groove 30a, which had been facing outward, now faces inward, and the stopper 31, which had been fitted in the stopper groove 30a, comes into contact with the circumferential surface of the Kanzashi stick 30 (FIGS. 17B-F). .

Therefore, the mold thickness adjusting intermediate piece 15 can be freely moved in the axial direction of the small diameter portion 22.

Therefore, each mold thickness adjustment middle piece 15 is set as shown in FIG. 17C.

After completing all the movements, the kanzashi stick 30 is turned 180° again.

Then, the stopper 31 of each middle mold thickness adjustment piece 15 is again fitted into the stopper groove 30a and stopped.

(Mold Thickness Adjustment Mechanism No. 10) The mold thickness adjustment mechanism shown in FIGS. 18A-B-C is also configured to restrain the mold thickness adjustment middle piece to the Kanzashi bar.

That is, each mold thickness adjustment middle piece 15 is used in common, and the small diameter portion 22
The Kanzashi rod 33 that penetrates in parallel with the transmission rod is connected to the rear end portion 1 of the transmission rod.
The two parts are installed so that they reach the end face of the transmission rod on the right side from the small diameter part 22.

The Kanzashi rod 33 is provided with stopper grooves 33a having a semicircular cross section in a ring shape that goes around the circumferential direction at positions having the same pitch as the thickness dimension of the mold thickness adjustment middle piece 15.

On the other hand, each mold thickness adjustment middle piece 15 is connected to the stopper groove 33a.
It has a built-in pole stopper 34 that is stopped by fitting into the pole.

The pole stopper 34 is pressed by a pressing spring 35 behind it.

In this mold thickness adjustment mechanism, in order to change the position of the restrainer receiving part 25, first, move the mold thickness adjustment middle piece 15 to be moved.
Push strongly in the moving direction (the axial direction of the small diameter portion 22).

Then, the pole stopper 34 pressed by the suppression spring 35 comes to overcome the stopper groove 33a of the Kanzashi rod 33 due to the force, and the mold thickness adjustment piece 15 can be easily moved to the target position.

Moreover, the pole stopper 34 is fitted into the stopper groove 33a at the arrival position, and the mold thickness adjustment middle piece 15 is again pressed against the bar 3.
It is stopped to 3.

(Mold Thickness Adjustment Mechanism No. 11) The mold thickness adjustment mechanism shown in FIGS. 19A, B, and C has a structure in which the movement and restraint of the mold thickness adjustment piece 15 can be performed by magnetic action and by remote control. This is a characteristic feature.

That is, coils 36 are provided on the outer peripheral surfaces of the transmission rod end surface 12' on the right side of the small diameter portion 22 and the rear end portion 12' on the left side thereof.
is wrapped around it to form an electromagnet.

Also. Each mold thickness adjustment piece 1 is movable along the small diameter portion 22
A coil 36 is also wound around the outer circumferential surface of each of the magnets 5, . . . to form an electromagnet.

In this embodiment, each mold thickness adjustment intermediate piece 15 is restrained by being distributed to the left and right to form the restraining element receiving part 25, so that the restraining element receiving part 25 is spaced apart and facing each other. Regarding the two mold thickness adjustment middle pieces 15.15 (the third and fourth from the left in Fig. 19A), the electromagnet polarity on the opposing surface side is the same, and for the other pieces, Adjacent electromagnets are controlled so that their polarities are different.

Then, the electromagnets facing each other with the restrainer receiving part 25 in between repel each other, and the other adjacent electromagnets attract each other, so that each die thickness adjustment intermediate piece 15 is firmly restrained as a whole.

The polarity of each electromagnet can be easily controlled by switching the current direction to each coil 36.

To change the position of the restrainer receiving part 25, first, each coil 3
The direction of energization to the electromagnets 6 is switched so that the polarity of each electromagnet becomes the same between adjacent electromagnets on opposing surfaces.

Then, due to magnetic repulsion, each mold thickness adjustment middle piece 15...
・ Adjacent ones are located a certain distance apart as shown in FIG. 19B.

Next, the mold thickness adjustment mechanism 15 is moved all to the right in order to form the restrainer receiving part 25 at the position shown in FIG. 19C,
In relation to the rear end portion 12' of the transmission rod, the restrainer receiving portion 2
The polarities of the electromagnets on the sides facing each other with 5 in between are controlled to be the same polarity, and the polarities of other adjacent electromagnets are controlled to be different polarities.

Then, due to the attractive force between the electromagnets with different polarities and the magnetic repulsion force between the electromagnets with the same polarity, all four mold thickness adjustment middle pieces 15 move to the right, forming the restrainer receiving part 25, At the same time, the mold thickness adjusting middle piece 15 is stopped at the arrival position.

Note that after stopping, it is preferable to lower the voltage applied to the coil 36.

(Mold Thickness Adjustment Mechanism No. 12) In the case of the mold thickness adjustment mechanism shown in FIG. 19, it is necessary to constantly energize the coil 36 in order to stop the mold thickness adjustment piece 15.

Therefore, the mold thickness adjustment mechanism No. 12 described here is an improvement plan as described above, and although not shown in the drawings, each of the mold thickness adjustment intermediate pieces 15 . . . around which the coil 36 shown in FIG. 1
This device is characterized by a configuration that employs a positioning and stopping mechanism as shown in FIG.

That is, each mold thickness adjustment middle piece 15 has a built-in pole stopper that is pressed by a pressure spring, and the small diameter part 22 or the first
As shown in FIG. 8, stopper grooves into which the pole stoppers are fitted are provided in the bar that passes through each mold thickness adjustment piece 15 at positions with the same pitch as the thickness dimension of the mold thickness adjustment piece 15.

Therefore, positioning and stopping of each mold thickness adjustment piece 15 is performed by a pole stopper fitted into the stopper groove, and movement of each mold thickness adjustment piece 15 is carried out by magnetically energizing each coil. This is done using repulsion and magnetic attraction.

Therefore, there is no need to energize the coil except when moving the mold thickness adjustment piece.

(Mold Thickness Adjustment Mechanism No. 13) The mold thickness adjustment mechanism shown in Figures 20A-L uses a kanzashi rod, and it is necessary to specify the position of the restrainer receiving part, and to move and restrain each mold thickness adjustment piece. This device is characterized by being configured such that it can be performed by operating a kanzashi stick.

That is, one Kanzashi rod 37 that passes through the four mold thickness adjustment middle pieces 15 installed in the small diameter part 22 which is the mold thickness adjustment middle piece storage part and in parallel with the small diameter part 22 is used. It passes through the shaft hole 40 penetrating the rear end portion 12' of the transmission rod to reach the shaft hole 39 provided at the right end surface of the transmission rod of the small diameter portion 22, and is rotatable and movable in the axial direction. It is installed in

The left end of the bar 37 is made to protrude sufficiently long to the left from the left end surface of the rear end portion 12', and is integrally connected to the piston 38' of a pressing cylinder 38 fixed to the left end surface of the rear end portion 12'. It is configured to also serve as a rondo.

Furthermore, a shaft is provided as an extension of the bar 37 and extends to the left through the suppression cylinder 38, and a flat corner part 41 to which a turning tool such as a spanner can be attached is formed at the left end of the shaft.

Each mold thickness adjustment middle piece 15 has a kanzashi rod 37 passing through it.
arm moving claw piece 4 that is constantly pushed by a compression spring 42 toward
3, and the outer end is in contact with the Kanzashi rod 37 and the inner end is the small diameter part 2
It has a built-in stopper 44 that contacts 2.

On the other hand, each mold thickness adjustment piece 15 on the outer peripheral surface of the Kanzashi stick 37
A groove 45 into which the arm moving claw piece 443 and the stopper 44 are fitted is provided in the area where it contacts.

As shown at L in FIG. 20, the groove 45 is
In the cross section of 7, a 2×4 (shaped Same number of thickness adjustment pieces) are provided.

Further, convex surface portions 46, 46 are formed at different symmetrical positions E, leaving the outer diameter surface of the Kanzashi stick 37 intact.

The end portions of the arm moving claw piece 43 and the stopper 44 that come into contact with the kanzashi bar 37 are formed as semicircular convex curved surfaces having approximately the same radius as the groove 45 (FIGS. 20G and 20H). .

Each groove 45 of the Kanzashi stick 37 has its starting point (left end) equally aligned, is parallel to the axial direction, and has a unique length, as shown in FIGS. It is shaped and formed as.

Regarding the length of the groove 45..., the symmetrical positions Rollo, Harbor,
212, Hoho's comrades are the same.

Further, the specific length of the groove 45 means the length in which the arm moving pawls 43 and stoppers 44 of the mold thickness adjusting middle pieces 15 can fit simultaneously.

For example, in Figure 20 J, the longest groove is the groove 45 at position E.
However, the groove 45 simultaneously engages all four pieces of piece moving claw pieces 43.
, the length is such that the stopper 44 fits (Fig. 20C).
reference).

The groove 45 at the shortest mouth position is long enough to fit only one piece moving claw piece 43 and a stopper 44 (see Figure 20).

C. The groove 45 at the second position is the piece moving claw piece 43 and the stopper 4.
It is said to be long enough to fit three and two 4's respectively.

A stopper groove 47 is provided on the outer circumferential surface of the small diameter portion 22 at a location where the stopper 44 comes into contact, at a pinch position that is the same as the thickness dimension of the mold thickness adjustment middle piece 15.

The stopper groove 47 is formed as an arcuate groove oriented perpendicular to the axis of the small diameter portion 22 .

On the other hand, the end surface of the stopper 44 that fits into the stopper groove 47 is formed into a semicircular convex surface having the same radius as the stopper groove 47.

Regarding the mold thickness adjustment mechanism, a case will be described in which the restrainer receiving portion 25 is changed from the position shown in FIG. 20A to the position shown in FIG. 20F.

The state shown in FIG.
The piece moving claw piece 43 and the stopper 44 are in contact with each other at the position shown in FIG. In Fig. 20G), the piece moving claw piece 43 can move the Kanzashi stick 37 in the axial direction.

Therefore, at the beginning of the mold change operation, the piston 38' of the pressing cylinder 38 is moved to the leftward limit position, and then the flat part 4
Attach the turning tool to 1.

Then, by turning the kanzashi stick 37, align the longest groove 45 (groove at the E position) in which the piece moving pawls 43 and stoppers 44 of all of the mold thickness adjustment middle pieces 15 can be fitted at the same time on the O-0 line in FIG. 20G. to be located.

Then, as shown in FIG. 20B, the three mold thickness adjustment middle pieces 15 on the left side are removed.

The piece moving claw pieces 43 fit into the outward grooves 45.

At the same time, an inward groove 45 symmetrical to the groove and a stopper 4
The relationship with 4 is off (see Figure 20C).

Thereafter, the piston 38' of the suppression cylinder 38 is moved to the rightward limit position.

Then, the three mold thickness adjustment middle pieces 15 on the left side (Fig. 20C)
(see) moves to the right together with the Kanzashi stick 37 via the moving claw piece 43 fitted in the outward groove 45.

At this time, the stopper 44 easily floats up from the stopper groove 47 due to the axial force applied to the mold thickness adjustment piece 15 and comes off.
This does not impede the movement of the mold thickness adjustment middle piece 15 in the axial direction.

When the piston 38' reaches the rightward movement limit position, the three mold thickness adjustment intermediate pieces 15 that have been moved come into close contact with the single mold thickness adjustable piece 15 on the right side (Fig. 20C). ,and,
Piece moving claw piece 43 of the mold thickness adjustment mechanism 15 on the right side
It also fits into the outward groove 45, while the stopper 44
and the inward groove 45 are out of relationship (FIG. 20C).

Next, move the 1-kanzashi stick 37 until the groove 45 at the roller position is located on the O-0 line in FIG. 20G (B).

Then, as shown in Figure 20, only the piece moving pawl piece 43 built into the leftmost mold thickness adjustment middle piece 15 fits into the outward groove 45, and at the same time, the piece moves into the inward groove 45 which is symmetrical to the groove. 4
5 is located directly above the stopper 44.

Therefore, this time, move the piston 38' of the pressing cylinder 38 to the leftward limit position, and move the mold thickness adjustment middle piece 1 at the left end.
5 is moved to the left all together with the Kanzashi rod 37 and brought into close contact with the rear end portion 12' of the transmission rod 12, and a restrainer receiving portion 25 is formed between it and the mold thickness adjustment middle piece 15 adjacent to the left (the 20th Figure E).

Finally, turn the Kanzashi stick 37 again, and turn the convex part 46 at the A position.
is located on the O-0 line in FIG. 20G.

(FIG. 20F) Then, as in the first FIG. 20A, the stopper 44 of each middle mold thickness adjustment piece 15 is pushed by the convex surface part 46 at the back, and is fitted into the stopper groove 47 so that the middle mold thickness adjustment piece 15... is achieved, and the purpose of changing the position of the restrainer receiving portion 25 is achieved.

In the case of this mold thickness adjustment mechanism, the restrainer receiving part 2
The position changing operation in step 5 is carried out in common up to the step shown in FIG. Depending on whether it matches the 0-0 line in G, the restraint receiving part 25
Kokichi can freely decide the position of.

In addition, in the state shown in FIG. 20C, if you turn the bar 37 and align the convex surface 46 with the 0-0 line in FIG. 20G, the position of the restrainer receiving part 25 will be the position shown in FIG. 20C. ,
In other words, all the middle mold thickness adjustment pieces 15... have been shifted to the right and moved to positions between them and the right end surface of the rear end 12' of the transmission rod 12.

Therefore, the position of each groove 45 is marked on the left end of the Kanzashi stick 37 so that the position of each groove 45 can be visually recognized.
It is extremely advantageous when rotating the Kanzashi stick 37 by hand to make a configuration in which the symbol (2) is engraved and the selected symbol matches the reference mark.

Furthermore, by numerically controlling the drive of the pressing cylinder 38 and the rotation of the kanzashi rod 37, full automation of the mold thickness adjustment operation is realized.

Next, regarding the restraint mechanism, various configuration examples of how the protrusion is formed in relation to the restraint element and the restraint element receiving part will be shown.

(Restraint Mechanism Part 2) FIG. 21 shows a pair of upper and lower block-shaped restrainers 1 for the restrainer receiver 251 formed in the mold thickness adjustment mechanism.
8L181 enters or leaves the transmission rod 121 to restrain or release the restraint, and instead of the arcuate concave surface 18a shown in FIGS. Rear surface (left side) 18 of restrainer 181
It is characterized by a configuration in which an inclined tapered concave surface 181a whose diameter gradually increases from 1c toward the front surface (right side surface) 181d is provided.

The outer diameter of the front surface (right side) 251b forming the restrainer receiving portion 251 is formed into a tapered surface 251c having the same shape as the tapered concave surface 181a of the restrainer 181.

As shown in FIGS. 22A and 22B, the details of the structure of the restrainer 181 are as follows.
It is formed as a semicircular concave surface 181ba having the same or slightly larger radius than the small diameter portion 221 of No. 21.

This restraint mechanism is an example in which a protrusion portion that partially collides with the rear surface 251a of the restraint element receiving portion 251 is formed on the rear surface 181c of the restraint element 181.

``To explain the effect of this restraint mechanism, in the low-speed mold closing process, first, the tapered concave surface 181a of the restrainer 181 is advanced until it lightly contacts the tapered surface 251c or just before contacting it.

The rear surface 251a of the restrainer receiving portion 251 of the transmission rod 121 moving forward in the direction of the arrow in the above figure collapses toward the rear surface 181c of the restrainer 181, and as a result, the restrainer 181 enters the restrainer receiving portion 257. This means that the appropriate front-back positional relationship has been aligned, and at the same time, the forward movement of the transmission rod 121 is stopped by the restrainer 18.
It is stopped at 1.

After that, when the restrainer 181 is completely inserted into the restrainer receiving part 251 using the chuck cylinder 21, the transmission rod 121
It is possible to easily completely restrain the molding machine, and there is no need to temporarily suspend the molding operation of the entire molding machine for the restraining operation, and such downtime can be reduced to zero.

(Restraint Mechanism Part 3) The restraint mechanism shown in FIG.
The rear surface (left side surface) 1 of the restrainer 182 protrudes beyond the outer diameter of the
This is an example in which a protrusion 152a that partially collides with 82a is formed.

That is, the front end surface of the restrainer 182 (the surface facing the outer diameter surface of the transmission rod 122 or the mold thickness adjustment middle piece 152) is
d to the rear surface 182a, and is formed in a plane parallel to the small diameter portion 222, and on the other hand, the restrainer receiving portion 252
The rear surface 252a has a protruding portion 152a relative to the front surface 252b forming the front surface 252b.

Therefore, in the operation of restraining or releasing the restraint of the transmission rod 122, the restraint member 182 is removed from the outer diameter surface of the front surface 252b forming the restraint member receiving portion 252 at its maximum at a position where its tip surface contacts or is close to the outer diameter surface of the front surface 252b forming the restraint member receiving portion 252. This is extremely advantageous in terms of control since the first step of entering or leaving the restraint mechanism as shown in FIG. 9 or FIG. 21 can be omitted.

The mold thickness adjustment mechanism to which this restraint mechanism is applied has four positions where each mold thickness adjustment intermediate piece 152 divides the circumference into four equal parts (however, this is not the case).

) has a protrusion 152a in FIG.
52 The protrusion 152a is the rear surface 182a of the restrainer 182.
Since the projections 152a of the other mold thickness adjustment middle pieces 152 need to be positioned at angles where they collide with each other and stopped at angles where they do not collide, a rotational direction positioning and stopping mechanism is provided.

A semicircular concave surface 182b into which the small diameter portion 222 fits is provided at the center of the distal end surface of the restrainer 182.

(Restraint Mechanism Part 4) The restraint mechanism shown in FIG.
A part of the outer diameter surface of 3 (including the left side surface thereof) is provided as a smooth surface 253c cut in the tangential direction, and relatively the rear surface 2
53a is characterized in that it has a protrusion.

Therefore, the first time in restraining or releasing the restraint of the transmission rod 123
When the restrainer 183 is brought into contact with the smooth surface 253C or brought close to the position just before the contact as a step of entering or exiting, the rear surface 253a forming the restrainer receiving part 253 is always connected to the restrainer. It partially collides with the rear surface 183a of 183.

In other words, a portion of the rear surface 253a is substantially formed into a protrusion.

(Restraint mechanism No. 5) The restraint mechanism shown in FIG. 25 is a modification based on the same technical idea as the restraint mechanism shown in FIG.
In place of c, the front surface 245b forming the restraint receiving part 253
A part of the outer diameter surface including the inner diameter part is formed as a medium diameter part 254C which is turned concentrically with the small diameter part 224, and the rear surface 254a has a relatively similar configuration to have a protrusion part that partially collides with the rear surface of the restrainer 184. It is characterized by the fact that

(Restraint Mechanism No. 6) The restraint mechanism shown in FIG. 26 includes a restraint receiving part 255 provided on the transmission rod 125, a restraint 185 that enters into the restraint receiving part 255, and a movable restraint included in the restraint 185. Piece 18
This is characterized in that 5a is configured as a protrusion.

The rear surface 255a on the left side in the figure, which forms the restrainer receiving part 255, collides with the rear surface 185a' on the left side in the figure of the movable piece 185a.

The movable piece 185a is supported by a dovetail structure with respect to the restrainer 185 so as to be slidable toward the small diameter portion 225, and the back thereof is pressed by a pressing spring 185b.

In the figure, 1850 is a stopper pin of the movable piece 185a,
It is fixed to the restrainer 185.

In the figure, 185d indicates a small diameter portion 22 on the distal end surface of the movable piece 185a.
It is a semicircular concave surface provided so that the number 5 fits into it.

In the case of this restraint mechanism, the first stage of the movement of the restraint member 185 is such that the distal end surface of the movable piece 185a is in contact with the outer diameter surface of the transmission rod 125 and is retracted by meshing the suppression spring 185b by a certain amount. Ru.

As the transmission rod 125 moves to the right in the figure, the restraint receiving part 2
55 approaches and reaches the position of the movable piece 185a,
The movable piece 185a pushed by the pressing spring 185b enters the restrainer receiving portion 255 and enters the state shown in FIG. 26B.

When the transmission rod 125 further moves, the rear surface 255a of the restrainer receiving portion 255 moves to the rear surface 1 of the movable piece 185a of the restrainer 185.
85a' and the transmission rod 125 is stopped by the movable piece 185a.

After that, the restrainer 185 is completely advanced, and the transmission rod 125 is
complete restraint.

Therefore, the first stage entry operation of the restrainer 185 is performed by the restrainer 1
There is no need to consider when the restrainer receiving section 255 will reach the position where the restrainer 85 is waiting, and the restrainer 185 can be
can be kept on standby while operating the first stage approach,
Therefore, it is possible to provide sufficient time when starting the chuck cylinder.

Further, the movement of the movable piece 185a into the restrainer receiving portion 255 is quick and advantageous.

(Restraint mechanism No. 7) The restraint mechanism shown in Fig. 27A-B-C is as shown in Fig. 26A-B.
This is an example in which a rotary member 186a is rotatably attached to the restrainer 18, and the rotary member 186a is configured as a protrusion, similar to the above.

That is, the rotating member 186a has its support pin 186b rotatably attached to the restraint element 186 at a position closer to the left side (rear surface) side of the restraint element 186.

The rotary member 186 has a rotational forward limit at a position parallel to the reciprocating direction of the restrainer 186, and when the rotary member 186 is at the rotational forward limit position, the distal end of the rotary member 186a is aligned with the distal end surface 18 of the restrainer 186.
6' (FIG. 27A).

The rotating member 186a rotates only in the clockwise direction from the forward rotation limit position in FIG. 27A, that is, in the backward direction of the transmission rod 126 (
It is possible to rotate only in the left direction (in the figure).

The support pin 186b extends to the power chamber 186c (FIG. 27B), and is applied with a rotational force in the counterclockwise direction indicated by the arrow in FIG. 27C by a power source such as a spiral spring (not shown). There is.

The right corner of the tip of the rotating member 186a is chamfered into an arc shape.

In the figure, 186d is a semicircular concave surface provided on the distal end surface of the rotating member 186a so that the small diameter portion 226 of the restrainer receiving portion 256 fits therein.

In the case of this restraint mechanism, the restraint member 186 is normally held at the position shown in FIG.

Therefore, the right corner of the chamfered tip of the rotating member 186a is in contact with the outer circumferential surface of the transmission rod 126, and during the mold closing process, the rotary member 186a moves to the right in the drawing together with the restraint element receiver. portion 256 approaches, rotating member 186
When reaching position a, the front rotating member 186a enters the restrainer receiving portion 256 while rotating, reaches the rotational advance limit position, and stops rotating, resulting in the state shown in FIG. 27A.

That is, the rotating member 186a becomes a protruding portion, and the rear surface (left side surface) 256a forming the restrainer receiving portion 256 collides with the rear surface (left side surface) 186a', and the transmission rod 126 is stopped.

Thereafter, the restrainer 186 performs a second stage of advancing operation, and the transmission rod 126 is restrained by complete connection.

On the other hand, in the mold opening process, the restrainer 186 is
If the condition is kept as shown in FIG.
56b catches up with the front surface of the rotating member 186a and collides with it, and then the rotating member 186a gradually rotates clockwise and escapes against the rotational force applied by a spiral spring or the like, and finally the restraining element receiving part Escape from 256 and the second
The state shown in Figure 7C is reached.

Therefore, this restraint mechanism is advantageous in terms of control because it can omit the first stage approach operation or the second stage backward movement of the restrainer.

Note that each of the restraint mechanisms described above has a structure in which the protrusion is formed only on either the restraint element or the restraint element receiving part, but this is not the case. It is also possible to have a configuration in which the restrainer receiving portions are formed on both sides.

(Effect of the invention) As explained above, the present invention provides the cylinder body 6'
is movable forward and backward along the tie bar 10, and a large-diameter, small-stroke strong-pressure mold clamping cylinder 6 is formed by joining the front end of seven pistons 7 to the movable platen 3.A small-diameter, large-stroke, high-speed movement that moves the movable platen 3 forward and backward. A cylinder 8, a second stationary plate 2b whose front end is connected to the cylinder body 6' of the strong mold clamping cylinder 6 and whose rear end is fixed on the bed 11, a transmission rod 12 that advances and retreats within the hollow part 2a, and a second stationary plate. 2', the hook-shaped restrainer 18 installed on the side facing the cylinder body 6' of the strong pressure mold clamping cylinder 6 is advanced into or retreated from the restrainer receiving part 25 of the transmission rod 12, thereby locking the transmission rod. A restraining type mold clamping device comprising a restraining mechanism for restraining or releasing the restraint, wherein a constant number of mold thickness adjustment pieces are arranged in a mold thickness adjustment piece storage portion of the transmission rod 12 so as to be movable in the axial direction of the transmission rod. , and a mold thickness adjustment mechanism is provided in which the mold thickness adjustment mechanism is stored in series, and in the mold thickness adjustment mechanism, each mold thickness adjustment medium piece storage section is distributed to one end side or both end surfaces side. A space between the end face of the mold thickness adjustment middle piece storage part and the mold thickness adjustment piece or between one adjacent mold thickness adjustment mechanism is formed as a restraining element receiving part, and the mold thickness adjustment mechanism is A restraint-type mold clamping device for an injection molding machine having means for individually restraining each mold thickness adjustment piece with respect to a transmission rod, or the entire structure of the above-mentioned restraint-type mold clamping device as a main part; A protrusion that enables partial collision of each surface is provided on either or both of the rear surface of the child or the rear surface in the forward direction of the transmission rod that forms the restraint child receiving part, at right angles to the forward and backward direction of the transmission rod. The gist of the present invention is a restraining type mold clamping device for an injection molding machine, which is characterized in that it is formed in the orientation of .

■ A restraining type injection molding machine in which the strong pressure mold clamping cylinder moves together with the movable platen, and the transmission rod connected to the cylinder body of the strong pressure mold clamping cylinder is restrained to the second fixed plate to provide the reaction force of the strong pressure mold clamping. As a mold clamping device, the essential feature of this type is that the piston stroke of the high pressure mold clamping cylinder can be made small by making it almost the same thickness as one mold thickness adjustment mechanism, and the dimension of the high pressure mold clamping cylinder in the piston movement direction can be reduced accordingly. It is possible to enjoy the effects of reducing weight and further downgrading the capacity of the hydraulic system.

Similarly, there is no need for the piston of the strong pressure mold clamping cylinder to have a hollow structure, and there is no need for the piston shaft to protrude on both sides of the piston and for the required length to protrude outward on both sides of the cylinder body. In other words, the structure of the high-pressure mold clamping cylinder can be made extremely simple and compact, and there is no need for an oil seal.In particular, the pressure receiving surface of the piston that receives hydraulic pressure during mold clamping can be made to cover the entire diameter of the piston. In this sense as well, it is possible to enjoy the effects of being able to make the strong pressure mold clamping cylinder lighter and smaller, and downgrading the configuration of the hydraulic pressure and hydraulic system.

■ In addition, as for the performance of the restraining type mold clamping device, firstly, by moving the mold thickness adjustment piece in the axial direction, the position of the restraining element receiving part can be changed freely, which is a basic feature in mold thickness adjustment accompanying mold change. To be able to easily, quickly and accurately set a new stroke.

Second, since there is no need to take the mold thickness adjusting piece in and out of the mold thickness adjusting mechanism when adjusting the mold thickness, there is no trouble in storing and managing the mold thickness adjusting piece.

Thirdly, it is possible to eliminate the downtime of the molding operation of the entire molding machine when the restraint mechanism is switched to restrain or release the restraint of the transmission rod. Expressed in terms of production quantity, production increased by 27 pieces per hour, which is actually 66 pieces when compared with full production in 24 hours.
It is possible to increase production by one unit.

Fourthly, this restraint-type mold clamping device causes a partial collision between the restrainer and the restrainer receiver by the protrusion, and then allows the restrainer to enter the restrainer receiver to complete the connection. The restraint operation is extremely safe and reliable as the restraint is completed.

Fifth, the control system of this restraint-type mold clamping device can be implemented using a very common technology that sequence-controls a hydraulic circuit based on the detection signal of a limit switch, and other effects can be expected.

[Brief explanation of the drawing]

1 and 2 are front views with main parts cut away showing the mold closing and mold opening states of a restraining type mold clamping device according to an embodiment of the present invention, and FIG. 3 is a front view showing the - ■Cross-sectional view, Figures 4 and 5
The figure is an enlarged view of the mold thickness adjustment mechanism, FIG. 6 is a sectional view taken along line I-1 in FIG. A-B-C are a cross-sectional view, a front view, and a perspective view of the restraint element. FIG. 9 A-B-C is an explanatory diagram of the operation of the restraint mechanism, and FIG. 10 A
-F, Figure 11 A-D, Figure 12 A-B, Figure 13 A-
E, Figure 14 A-F, Figure 15 A-F, Figure 16 A-D
, Figure 17A~. F, Figure 18 A-C, Figure 19 A-C1 Figure 20 A-L
are explanatory views showing examples of different configurations of the mold thickness adjustment mechanism, of which FIG. 12B is a sectional view taken along line dd, FIG. 12B is a sectional view taken along line bb in the same figure, FIG. e-
16B is a cross-sectional view taken along line b-b in the same figure, Figure 17 E-F is a cross-sectional view taken along line e and f in the same figure cc sectional view of Figure B, Figure 20 G-H
is a sectional view taken along line GG and hh in Figure A-B, Figure 20 ■ is a front view of the Kanzashi stick, Figure 20 J is a developed view of the same, and Figure 20
The figure shows a cross-sectional view of Figure 20.
It is a 1-1 sectional view of FIG. J. FIG. 21 is a front view showing an example of a different configuration of the restraint mechanism, and FIGS. 22A-B-C are a sectional view, a front view, and a perspective view showing a restraint element in the same previous restraint mechanism. 23A-B, 24A-B, 25A-B, and 26A-B are a sectional view and a front view, respectively, showing further different configurations of the restraining mechanism. 27A-B-C are a sectional view in the front direction showing an example of another configuration of the restraint mechanism, a Y arrow view of the restrainer in the same previous sectional view, and a sectional view in the front direction showing the operating status of the rotating member. It is a diagram. 28A-B show examples of other configurations of the restraint mechanism a-
They are a sectional view and a front view. FIGS. 29A and 29B are explanatory diagrams showing examples of different configurations of the restraining means of the mold thickness adjustment middle piece. 3... Movable platen, 6... Strong pressure mold clamping cylinder, 6'.
... Cylinder body, 7... Piston, 8... High-speed moving cylinder, 11... Bed, 2'... Second fixed plate, 12... Transmission rod, 18... Restrictor, 25 ...Restrictor receiving part, 15...Mold thickness adjustment middle piece, C...Mold thickness adjustment mechanism, 18C...Protrusion part, 21...Chuck cylinder, 22...Small diameter part, 23 ...Kanzashi stick.

Claims (1)

[Scope of Claims] 1. A large-diameter, small-stroke strong-pressure mold clamping cylinder whose cylinder body is freely movable forward and backward along tie bars, and whose front end of the piston is joined to a movable platen, and a small-diameter cylinder that moves the movable platen forward and backward. A high-speed moving cylinder with a large stroke, a transmission rod that advances and retreats in the hollow of a second fixed plate whose front end is connected to the cylinder body of the strong pressure mold clamping cylinder and whose rear end is fixed on the bed, and the strong pressure in the second fixed plate. A restraint type consisting of a restraint mechanism that is installed on the side of the mold clamping cylinder facing the cylinder body and causes a block-shaped restraint to enter or retreat into the restraint receiving part of the transmission rod to restrain or release the restraint of the transmission rod. (a) A mold thickness tightening device comprising: (a) a mold thickness adjustment piece in which a constant number of mold thickness adjustment pieces are movable in the axial direction of the transmission rod and stored in series in the mold thickness adjustment cylindrical storage portion of the transmission rod; (b) In the mold thickness adjustment mechanism, when each mold thickness adjustment piece is distributed to either one end face side or both end face sides of the mold thickness adjustment cylinder housing part, the mold thickness is adjusted. A space between the end face of the thickness adjustment cylindrical housing part and the mold thickness adjustment piece or between adjacent mold thickness adjustment pieces is formed as a restraining receiving part; It has means for individually restraining the mold thickness adjustment piece with respect to the transmission rod. A restraining type mold clamping device for an injection molding machine featuring the following features. 2. A strong pressure mold clamping cylinder with a large diameter and a small stroke, whose cylinder body can move forward and backward along a tie bar, and whose front end of the piston is joined to a movable plate; and a high-speed movement cylinder with a small diameter and a large stroke that moves the movable plate forward and backward. a transmission rod whose front end is connected to the cylinder body of the strong pressure mold clamping cylinder and whose rear end moves forward and backward within the hollow part of a second fixed plate fixed on the bed;
A block-shaped restrainer installed on the side facing the cylinder body of the strong pressure mold clamping cylinder in the second stationary platen is moved into or retreated from the restrainer receiving part of the transmission rod to restrain or release the restraint of the transmission rod. A restraining type device comprising a restraining mechanism, wherein (a) a constant number of mold thickness adjustment pieces are movable in the axial direction of the transmission rod and arranged in series in the mold thickness adjustment cylindrical storage part of the transmission rod; (b) In the mold thickness adjustment mechanism, each mold thickness adjustment piece is moved to either end face side or both end face sides of the mold thickness adjustment cylindrical housing part. 9. Between the end face of the mold thickness adjustment cylinder storage section and the mold thickness adjustment piece when sorted and brought together.9. Alternatively, the space between adjacent mold adjustment pieces is formed as a restraining element receiving part, and (c) the mold thickness adjustment mechanism has means for individually restraining each mold thickness adjustment piece with respect to the transmission rod. (2) A protrusion is installed on either or both of the rear surface of the restrainer or the rear surface in the forward direction of the transmission rod that forms the restraint receiving part to enable partial collision of each surface. A restraint-type mold clamping device for an injection molding machine, characterized in that the device is formed in a direction perpendicular to the advancing and retreating direction of the injection molding machine.