JP3694114B2 - Paper roll clamping device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a clamping device that is mounted on a lift truck and can handle two vertically stacked paper rolls.
[0002]
[Prior art]
This type of clamping device includes a short clamp arm assembly that is independently driven, and a pair of long clamp arms that are positioned opposite to each other and are individually driven. The purpose of driving the long clamp arms separately is to ensure that the vertically stacked paper rolls can be firmly gripped even if they have different diameters. When gripping a paper roll with a clamp device, a pair of long clamp arms are driven simultaneously and begin to close, but when a paper roll of a different diameter is encountered, first one of the long clamp arms strikes the larger paper roll and clamps it. Grasp in cooperation with the arm assembly, the other long clamp arm closes further and hits the smaller paper roll and grips it in cooperation with the short clamp arm as well as the long clamp arm. When the paper roll is released, the pair of long clamp arms are opened with a shift by the difference in the diameter of the gripped paper roll.
[0003]
[Problems to be solved by the invention]
If you try to access a vertically stacked paper roll for the next handling operation with the long clamp arms shifted from each other, the long clamp arm will hit the adjacent paper roll. Above, it is necessary to close beforehand to a position where the paper roll to be grasped can be accessed, i.e. close to the diameter of the paper roll. Such synchronization of the long clamp arm is impossible in the middle of its opening, and is achieved by driving the long clamp arm to the fully open position. However, if such a process is performed each time the paper roll is handled, the work efficiency is low, and the appearance of a clamping device having a simple mechanism for solving this problem has been strongly desired.
It is an object of the present invention to provide a clamping device that automatically and mechanically synchronizes long clamp arms that are offset from each other in the initial stage of the opening operation.
[0004]
[Means for Solving the Problems]
According to the present invention, a single short clamp arm assembly, a pair of long clamp arms that are individually driven opposite to the short clamp arm assembly, and the long clamp arms to each other to drive the pair of long clamp arms synchronously. A tuning unit that is releasably connected, and the tuning unit is located between a pair of long clamp arms and is mounted on a spring loaded follower means mounted on one long clamp arm and on the other long clamp arm, There is provided a clamping device comprising cam means cooperating with the follower means.
The follower means is an elongated housing fixed to one long clamp arm, a holder slidably received in the housing, and a roller follower rotatably mounted at the tip, and a housing that regulates the position of the outer of the holder And a coil spring that pushes the roller follower toward the cam means. The cap engages with the holder and the long clamp arm. The cam means is usually composed of a cam plate having a central valley portion that engages with the roller follower and a front and rear peak portion.
[0005]
[Action]
Since the pair of long clamp arms are connected via the tuning unit, they open and close together. When taking two paper rolls stacked vertically, if one encounters a paper roll with a different diameter, one long clamp arm first hits the paper roll with the larger diameter, and the other long clamp arm continues with the one with the smaller diameter. Hit the paper roll. At this time, both long clamp arms deviate from each other by the difference in diameter of the paper roll against the action of the coil spring, and the spring is accumulated by the interaction between the follower means and the cam means, and the pressure is accumulated when the paper roll is released. The long clamp arm that has been displaced by the action of the spring is quickly returned to the position that synchronizes with the other long clamp arm. Subsequently, both long clamp arms are driven in a synchronized state.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Referring to the drawings, in particular FIGS. 1 and 2, a clamping device 1 according to the present invention is mounted on a rotary assembly 3 of a carriage 2 that is supported in a liftable manner on a mast of a lift truck. More specifically, the clamping device 1 includes a single short clamp arm assembly 5 rotatably connected to the rotary assembly 3 by a pivot pin 4, and a rotary pin 3. A single short clamp arm assembly 5 is driven by a hydraulic cylinder 8 connected between the short clamp arm assembly and the rotary assembly. The long clamp arms 7 are individually driven by hydraulic cylinders 9 connected to the rotary assemblies of the long clamp arms.
The pair of long clamp arms 7 and 7 are releasably connected to each other by a tuning unit 10 so that they are driven in synchronization. The tuning unit 10 is located between a pair of long clamp arms, a follower means 11 attached to one long clamp arm 7, and a cam means 12 attached to the other long clamp arm 7 and cooperating with the follower means 11. Consists of. The follower means 11 is an elongated housing 13 fixed to one long clamp arm 7, a holder 15 slidably accommodated in the housing 13, and a roller follower 14 rotatably mounted at the tip, and an outer side of the holder 15 The cap 16 screwed to the front end of the housing 13 and the end are engaged with the holder 15 and the long clamp arm 7, so that the holder 15 and thus the roller follower 14 are moved toward the cam means 12. It consists of a coil spring 17 for pushing. The housing 13 and the holder 15 therein are both cylindrical and the holder 15 does not rotate relative to the housing 13 by engaging a dowel pin 19 secured to the housing 13 in a longitudinal groove 18 formed therein. So that the orientation of the roller follower 14 can be kept substantially parallel to the long clamp arm. The cam means 12 is generally composed of a cam plate 23 having a central valley 20 that engages with the roller follower 14 and crests 21 and 22 at the front and rear thereof.
[0007]
The short clamp arm assembly 5 is preset to an intended position by operating the hydraulic cylinder 8. The pair of long clamp arms 7, 7 are closed by operating the hydraulic cylinder 9 close to the diameter of the vertically stacked paper roll to be grasped. At this time, since both the long clamp arms 7 and 7 are connected by the tuning unit 10, they move together, that is, in synchronization. When the long clamp arms 7 and 7 are closed in order to bring the clamping device closer to and grip the paper roll, one long clamp arm (FIG. 5 and FIG. 5) is different, except when the diameter of the paper roll is the same. 6 on the left side (6) first hits the larger paper roll R1 and cooperates with the sheet clamp arm assembly 5 to grip it, and the other long clamp arm (left side in FIGS. 5 and 6) 7 is further closed. Then, it hits the smaller paper roll R2 and holds it in cooperation with the short clamp arm 5 in the same manner as the long clamp arm (FIGS. 3 and 4). At this time, since the cam plate 23 moves together with the other long clamp arm 7, the roller follower 14 rides on one peak portion 21, thereby accumulating the coil spring 17. When the other long clamp arm first encounters a paper roll having a large diameter, the roller follower 14 rides on the other peak portion 22, thereby accumulating the coil spring 17. In any case, in this embodiment, the roller follower 14 does not get over the peak portion 21 or 22 of the cam plate 23 as long as the paper roll diameter difference is within 50 mm.
[0008]
When releasing the paper roll, when the hydraulic system is switched, the roller follower 14 and the valley 20 are engaged with each other by the action of the accumulated coil spring 17, whereby the other long clamp arm 7 is engaged with the other long clamp arm 7. First, it is returned, or one long clamp arm 7 is first returned to the other long clamp arm. Thus, the two long clamp arms are connected to each other by the tuning unit 10 and then opened in a synchronized state to a desired open position by the operation of the hydraulic cylinder.
When the above-mentioned paper roll diameter difference exceeds 50 mm, the roller follower 14 rides over the peak portion 21 or 22, and accordingly, the follower means 11 and the cam means 12 of the tuning unit 10 are separated from each other, and the long clamp arm Each grips the paper roll in cooperation with the short clamp arm assembly. When releasing the paper roll in this manner, the long clamp arms are returned to the fully open position while being displaced from each other. The long clamp arm that has grasped the paper roll having the larger diameter first reaches the fully opened position, and then the long clamp arm that has grasped the paper roll having the smaller diameter approaches the fully opened position. At that time, the roller follower 14 And the ridges 21 or 22 of the cam plate meet each other, and the roller follower passes over the ridges and reaches the valley 20. Thus, the two long clamp arms 7 and 7 are synchronized by the engagement of the roller follower 14 and the valley 20.
[0009]
【The invention's effect】
According to the present invention, the clamping device of the present invention can of course be applied to a paper roll having a very large diameter difference. However, when the paper roll has a relatively small diameter difference. The long clamp arm can be automatically and mechanically synchronized at the beginning of opening of the long clamp arm when releasing the paper roll. Is good.
[Brief description of the drawings]
FIG. 1 is a plan view of a clamping device according to the present invention.
FIG. 2 is a front view of the clamping device according to the present invention as seen from the front.
FIG. 3 is a plan view of a clamping device according to the present invention showing a state in which a vertically stacked paper roll is gripped.
FIG. 4 is a view similar to FIG. 2 showing a state in which a vertically stacked paper roll is gripped.
FIG. 5 is a cross-sectional view showing details of a tuning unit for synchronizing a pair of long clamp arms of the clamping device according to the present invention.
FIG. 6 is a cross-sectional view of the tuning unit in a state in which a pair of long clamp arms of the clamping device according to the present invention is displaced due to a difference in diameter of the paper roll.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Clamp apparatus 5 Single short clamp arm assembly 7 A pair of long clamp arm 10 Tuning unit 11 Follower means 12 Cam means 13 Housing 14 Roller follower 15 Holder 16 Cap 17 Coil spring 20 Valley part 21 Mountain part 22 Mountain part 23 Cam plate

Claims (2)

  A single short clamp arm assembly, a pair of long clamp arms that are individually driven opposite to each other, and a tune that releasably couples the long clamp arms together to drive the pair of long clamp arms synchronously The tuning unit is between a pair of long clamp arms and is provided with a spring-loaded follower means attached to one long clamp arm, and is attached to the other long clamp arm and cooperates with the follower means. The follower means has a roller follower at the tip thereof, and the cam means usually comprises a cam plate having a central valley portion engaging with the roller follower of the follower means and a front and rear peak portions thereof. Due to the difference in paper roll diameter, one long clamp arm When displaced from the arm, the roller follower of the follower means engages with the peak portion of the cam plate to move the follower means so as to accumulate the coil spring, and by releasing the paper roll, the action of the accumulated spring causes the follower means to move. Clamp device that moves the roller follower to the valley of the cam plate and returns the long clamp arm to the original position.   The follower means regulates the outer position of the elongated housing fixed to one long clamp arm, a holder slidably accommodated in the housing, and rotatably mounted with the roller follower at the tip. And a cap screwed to the distal end of the housing, the coil spring engaging the holder and the long clamp arm and acting to push the roller follower toward the cam means. 2. The clamping device according to 1.

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