JPH0712920B2 - Forklift split roll clamp - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a roll clamp for a forklift used for loading and unloading roll-shaped articles (hereinafter, simply referred to as roll paper) such as newsprint and kraft paper, More specifically, the present invention relates to a split type roll clamp in which a swing arm is divided into right and left so that it is effective for handling rolls of different diameters.

(Prior Art) A conventional split type roll clamp of this type has a structure in which two swing arms divided into left and right are individually rotated by a clamp cylinder, and the two clamp cylinders form one. It is designed to be activated by a control valve. However, the movement of both swing arms may not be aligned due to the difference in the load (frictional resistance, etc.) that acts on the swing arms. It is regulated. Specifically, the stopper mechanism is of a type in which a small-diameter pin provided on the other swing arm is loosely inserted into a cylindrical body provided on one swing arm between opposing side surfaces of both swing arms. It is general and allows the relative movement of the swing arm only within the range of the gap formed between the pin and the cylindrical body. As a split type roll clamp having two swing arms, for example, Japanese Utility Model Laid-Open No. 57-71198 can be cited.

(Problems to be Solved by the Invention) However, in the case of the stopper mechanism including the pin and the cylindrical body described above, since there is no synchronization function within the range of the gap in which relative movement is allowed, the range is within that range. Then, the irregular motion still occurs between the swing arms. Also, the relative movement amount allowed for the swing arm is the range of the gap set between the pin and the cylinder,
Specifically, since the limit is about several tens of mm, there is a problem that the range in which the different diameter roll paper can be handled is limited to a very narrow range.

Therefore, in view of the above problems, it is an object of the present invention to provide a split type roll clamp for a forklift capable of accurately synchronizing both swing arms and having a large handling range of roll paper of different diameters.

(Means for Solving the Problems) The present invention is configured as follows to solve the above problems.

The short arm is attached to one side of the clamp holder attached to the front surface of the lift bracket, and the swing arm is divided into left and right parts on the other side, and both swing arms are individually rotated by the clamp cylinder. In the split type roll clamp, one swing arm of the swing arms is provided with a cam member having an arcuate outer surface having a pivot point as a center and an engaging recess, and the other swing arm. The arm is provided with a lock member that releasably faces the engaging recess of the cam member and is constantly biased by a spring toward the engaging recess.

(Operation) According to the present invention configured as described above, the lock member is always engaged with the engagement concave portion of the cam member, and when the clamp cylinder is operated in this state, the left and right swing arms are It is rotated in synchronization. Therefore, when handling two rolls having the same diameter or one roll having a wide width, both swing arms can always rotate synchronously to clamp the roll.

Further, when the two different-diameter roll papers are clamped, if the clamp pad of one swing arm comes into contact with the large-diameter roll paper first, then the cam members that act on the lock member are pushed up from the engaging recesses. Due to the force, the lock member is disengaged from the engaging recess, and only the swing arm on the small diameter roll paper side is independently rotated. That is, two rolls of different diameters can be clamped regardless of the degree of different diameters.

(Example) Hereinafter, the Example of this invention is concretely described based on drawing. As shown in FIG. 3, a clamp holder 4 is mounted on the front surface of a lift bracket 2 that is moved up and down along a mast 1 of a forklift truck so as to be rotatable about a horizontal axis via a rotating body 3. On one side, two swing arms 5 divided into right and left are arranged, and on the other side, short arms 6 having a width corresponding to the widths of both swing arms are arranged to face each other.

As shown in FIG. 4, the two left and right swing arms 5 have their bases rotatably attached to the clamp holder 4 by a common shaft 7, and are individually rotated by the left and right clamp cylinders 8. And a clamp pad 9 is provided at each tip. The left and right clamp cylinders 8 are connected in a parallel circuit as shown in the hydraulic circuit diagram of FIG. 5, and are operated simultaneously by one clamp switching valve 10.

On the other hand, the base of the short arm 6 has the clamp holder 4
It is fixed by two shafts 11 and has a clamp pad 12 at its tip. The short arm 6 may be fixed by welding instead of the fixing method by the shaft 11, or may be integrally formed with the clamp holder 4.

Then, an arm synchronizing mechanism is assembled between the facing surfaces of the swing fulcrums of both swing arms 6, and this arm synchronizing mechanism is a so-called detent mechanism as shown in FIGS. 1 and 2. The swing member 5 includes a cam member 13 attached to one swing arm 5 and a lock member 15 attached to the other swing arm 5. Specifically, the cam member 13 is concentrically fixed to the center of rotation of the swing arm 5, and the arm mounting shaft 7 is provided.
Is a ring body having a hole for penetrating therethrough, and has one engaging recess 14 on the outer peripheral surface.

On the other hand, the lock member 15 is composed of a ball that can be engaged with and disengaged from the engagement recess 14 of the cam member 13, and is directed toward the cam member 13 by the spring 17 through the through hole 16a of the ball holder 16 fixed to the other swing arm 5. Pressed. And spring 17
The pressing force by the lock member 15, that is, the engaging force of the lock member 15 with respect to the engaging recess 14 of the cam member 13,
It is adjustable by means of an adjusting bolt 18 screwed in, which adjustment is retained by a lock nut 19.

The present embodiment is configured as described above, and the lock member 15 which is always a ball is engaged with the engagement recess 14 of the cam member 13, and both swing arms 5 are aligned at the same position. . Therefore, when the clamp cylinder 8 is operated in this state, the left and right swing arms 5 rotate in synchronization. That is, when handling two roll papers having the same diameter or a roll paper having a wide width, both swing arms 5 always maintain the aligned state, and the arm operation does not cause a non-uniform state. The operation for is simple.

On the other hand, in the case of handling two roll papers having different diameters, when the clamp pad 9 of one swing arm 5 contacts the roll paper on the large diameter side, the swing arm 5 is prevented from rotating. Therefore, after that, only the other swing arm 5 rotates, and relative movement occurs between the cam member 13 and the lock member 15. Therefore, as indicated by a phantom line in FIG. 1, the lock member 15 runs up against the spring 17 from the engagement recess 14 to the outer peripheral surface, and thereafter, the outer peripheral surface of the cam member 13 is moved along with the rotation of the swing arm 5. Roll around. That is, when the different-diameter roll paper is clamped, both swing arms 5 are released from the synchronous rotation, and each swing arm 5 can clamp the roll paper with a relative positional deviation corresponding to the diameter of the roll paper. is there.

Then, when the clamps are released, both clamp arms 5 individually rotate in the opening direction, but finally, at the stroke end of the arms, the lock member 15 and the engaging recess 14 of the cam member 13 coincide with each other, and the lock member 15 is released. Since it is engaged with the engaging recess 14,
It is possible to rotate the swing arms 5 again synchronously.

In the illustrated embodiment, the cam member 13 is a ring body, but it is sufficient if the cam member 13 has a part of the ring, that is, an arcuate outer surface having a predetermined length centered on the rotation center of the swing arm 5. Further, the lock member 15 is not limited to the illustrated ball, but may be a plunger.

(Effects of the Invention) As described in detail above, according to the split type roll clamp of the present invention, both swing arms can always be rotated synchronously to maintain the alignment position, so that the operation due to the non-uniform movement of both swing arms can be improved. This eliminates the hassle of the operation and provides good operability.In addition, for the clamping work of different diameter roll paper, the relative movement of both swing arms is different from the conventional stopper mechanism using a pin and a cylinder. Since there is no special restriction on the amount, the range of handling different diameter roll paper can be expanded.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a plan view showing an arm synchronizing mechanism, FIG. 2 is a side sectional view of the same, FIG. 3 is an overall side view of a roll clamp, and FIG. 5 is a hydraulic circuit diagram of the clamp cylinder. FIG. 1 ... Mast 2 ... Lift bracket 4 ... Clamp holder 5 ... Swing arm 6 ... Short arm 8 ... Clamp cylinder 13 ... Cam member 14 ... Engagement recess 15 ... Lock member 17 ... Spring

Claims (1)

[Claims] 1. A clamp holder mounted on the front surface of a lift bracket is provided with a short arm on one side and a swing arm divided into two parts on the other side, and both swing arms are individually rotated by a clamp cylinder. In the split type roll clamp configured to
While one swing arm is provided with a cam member having an arcuate outer surface centering on its pivot point and an engagement recess,
A split type roll clamp for a forklift having a lock member that is releasably opposed to the engaging recess of the cam member and is always biased toward the engaging recess by a spring on the other swing arm.