JPH0544075Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Technical field) The present invention relates to a cutting device for sheet-like members.

(Prior art) These continuous sheet-like members unwound from a roll of plain paper, photosensitive, heat-sensitive, pressure-sensitive paper, electrostatic recording paper, tracing paper, etc., or electronic copying machines, facsimile machines, printers, plotters, and microfilms. Reader printer, offset plate making machine,
In order to cut a large or long sheet-like member fed out from a packaging machine or the like into a predetermined size, a cutter 2 is installed in the width direction of the sheet-like member 1 as shown in FIG.
A transverse cutting device (the illustrated example shows a circle cutter) that moves back and forth, and a transverse cutting device that is disposed at a predetermined position in the width direction of the sheet-like member 1 and cuts the sheet-like member 1 in the feeding direction into a plurality of strip-like members. A longitudinal cutting device is used. This vertical cutting device usually consists of a pair of rotatable circle cutters 3 and 4 arranged above and below a sheet-like member 1, and the outer peripheral sides of both cutters are pressed against each other and the sheet is sandwiched between them. The shaped member 1 is cut in the feeding direction. Note that one of the pair of circle cutters 3 and 4 is fixedly disposed, but the other circle cutter is swung out in the width direction of the sheet-like member in case the sheet-like member is not cut. The circle cutter can be moved to a resting position away from the circle cutter.

(Problem to be solved by the invention) However, when cutting a sheet-like member in the conventional vertical cutting device of this type, the other circle cutter, which is swingable and movable, is biased by a spring to cut the other circle cutter. If the sheet-shaped member is thicker or harder than usual, the cutting resistance will increase and the other circle cutter will be pushed toward the rest position against its biasing spring. There was a possibility that problems such as the cutting line becoming crooked and the cut becoming dull due to the reduction in the pressure contact between the cutters.

(Purpose of the invention) The present invention was devised to effectively solve the above problems, and its purpose is to reduce the pressure contact force between the circle cutters when the sheet-like member is thick or hard. It is an object of the present invention to provide a cutting device that automatically increases a good cutting state and is always connected.

(Structure of the Device) In order to achieve the above object, the present invention connects the driven helical gear to the other circle cutter, and when the other circle cutter is in the operating position, the driven helical gear A driving helical gear is disposed in mesh with the driving helical gear, and the driving torque of the driving helical gear causes the other circle cutter to move in the direction of inclination of the tooth surfaces of the driving and driven helical gears. The direction is such that a thrust force is generated that is pressed toward the side of the circle cutter.

(Example) An example of the present invention will be described below based on the drawings. FIG. 1 shows a perspective view of a single unit of a longitudinal cutting device according to the present invention, and a plurality of the units are arranged at predetermined intervals in the width direction of a sheet-like member 1. In the figure, numeral 10 indicates a first circle cutter, and numeral 11 indicates a second circle cutter. Between these two cutters 10 and 11, the sheet-like member 1 is fed out in the direction of the arrow, and the blade 1 of the second circle cutter 11
1a is brought into pressure contact with the blade 10a of the first circle cutter 10, and the driven helical gear 19, which is integrated with the first circle cutter 10, is brought into mesh with the drive helical gear 18, so that both the blades 10a and 11a are brought into pressure contact and slide. When the cutting resistance of the sheet-like member 1 increases, the joint pressure between the helical gears 18 and 19 increases, and the diagonal inclination of the tooth surfaces increases the cutting resistance of the sheet-like member 1. The generated axial strite force causes the driven helical gear 19 to become the driving helical gear 18.
As a result, the blade 11a of the second circle cutter 11 is strongly pressed against the blade 10a of the first circle cutter 10, and this corresponds to the thickness, hardness, etc. of the sheet-like member. The optimum pressure welding force is automatically obtained, so a good cutting condition is always maintained. The present invention will be explained in more detail below.

The first circle cutter 10 is fixed to a first drive shaft 13 perpendicular to the feeding direction of the sheet-like member 1,
The second circle cutter 11 has a frame 15 which is rotatable around an axis 14 parallel to the feeding direction.
It is rotatably supported at one end. The other end of this frame 15 is connected to the plunger 6a of the electromagnetic actuator 16, and the electromagnetic actuator 16 is connected to the plunger 6a.
When the plunger 6a is turned ON and the plunger 6a is retracted, the second circle cutter 11 moves to the operating position where it comes into pressure contact with the first circle cutter 10, as shown in FIG. When projected, the second circle cutter 11 moves to a rest position separated from the first circle cutter 10, as shown in FIG. 3a. Note that the frame 15 is always urged toward the rest position by a spring (not shown).

The first circle cutter 10 has a cylindrical shape with a predetermined thickness and width, and a blade 10a is formed on one side of the periphery. On the other hand, the second circle cutter 11 has a thin disk shape, and a blade 11a is formed on the peripheral edge thereof. By sliding these pair of blades 10a, 11a overlapping each other with a predetermined width c as shown in FIG. 2, the sheet-like member 1 between them is cut.

A second drive shaft 17 parallel to the first drive shaft 13 is disposed near the second circle cutter 11, and a drive helical gear 18 is fixed to this drive shaft 17. The first and second drive shafts 13 and 17 are connected to each other via a transmission means such as a belt, and are driven by a common drive source. On the other hand, a driven helical gear 19 is coaxially fixed to one side of the second circle cutter 11.
When the blade is moved to the operating position for cutting, it is rotated in mesh with the drive helical gear 18. Here, as can be seen from FIG. 2, the direction of inclination of the tooth surfaces of the helical gears 18 and 19 is determined by the driving torque of the driving helical gear 18.
is pressed in a direction that increases the meshing width with the driving helical gear 18 (direction of arrow a in FIG. 2). Therefore, when the sheet-like member 1 has a thickness or hardness larger than usual, the joint pressure between the helical gears 18 and 19 increases in response to the increase in cutting resistance, and this force causes the second circle to The blade 11a of the cutter 11 is strongly pressed against the blade 10a of the first circle cutter 10.

The cutting device for the sheet-like member 1 is constructed as described above, and when the sheet-like member 1 is not cut in the feeding direction, the electromagnetic actuator 1 is used as shown in FIG.
6 is turned OFF and the second circle cutter 11 is swung out laterally and placed at the rest position. At this time, the first circle cutter 10 and the driving helical gear 18
is idling, and the second circle cutter 11 is stopped.

Next, when cutting the sheet-like member 1 in the feeding direction, the electromagnetic actuator 16 is turned on and the second circle cutter 1 is moved to the operating position as shown in FIG. 3b. When the second circle cutter 11 is moved into the operating position, the driven helical gear 19 coupled to the second circle cutter 11 meshes with the drive helical gear 18 and begins to rotate together with the second circle cutter 11. Also, the blade 11 of the second circle cutter 11
a slides in pressure contact with the blade 10a of the first circle cutter 10 and cuts the sheet-like member 1 sandwiched between the two blades 10a and 11a along the direction in which the sheet-like member 1 is fed out. At this time, when the thickness or hardness of the sheet-like member 1 becomes larger than normal and the cutting resistance increases, the conventional cutting device uses the force of the spring urging the second circle cutter 11 against the first circle cutter 10. In response, the second circle cutter 11 is pushed toward the rest position by the sheet-like member 1, and the pressing force between the two blades 10a and 11a is reduced, resulting in inconveniences such as the cutting line 20 being bent and becoming dull. There was a possibility that this would occur. However, in the present invention, when the cutting resistance increases, the blade 11a of the second circle cutter 11 automatically presses against the blade 10a of the first circle cutter 10 more strongly, so that the pressure bonding force between the two blades 10a and 11a is always maintained at an optimal level. Therefore, regardless of the type of sheet-like member 1, a good cutting condition is always maintained.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways. For example, in the above embodiment, an electromagnetic actuator is used as a means for moving the second circle cutter 11. Although 16 was used, it is also possible to use other combinations of motors and gears, or those using fluid pressure. Further, the direction of swinging out and feeding the second circle cutter 11 is not limited to the horizontal direction, but may also be the vertical direction. Furthermore, the driven helical gear 19
It is also possible to form a unit in which the helical gear 18 is meshed with the helical gear 18 that is constantly driven, and to move this unit integrally to press the first circle cutter 10 or to separate it from the first circle cutter 10. In this case, a backlash is formed so that the second circle cutter 11 or the driven helical gear 19 can move somewhat in the axial direction. Furthermore, in the above embodiment, the second circle cutter 11 is pressed against the first circle cutter 10 by the driving helical gear 18 attracting the driven helical gear 19;
On the contrary, the driving helical gear 18 pushes out the driven helical gear 9, thereby cutting off the second circle cutter 11.
may be crimped onto the first circle cutter 10. In this case, for example, the driven helical gear 19
The second circle cutter 11 may be attached to the opposite side of the gear, and the direction of inclination of the tooth surface of the gear may be reversed. Furthermore, the present invention allows cutting by moving the cutting device relative to the sheet-like member, and furthermore, the present cutting device can cut the sheet-like member not only in the horizontal direction but also in any direction such as the longitudinal direction. It is applicable.

(Effects of the invention) As mentioned above, in the present invention, the second circle cutter is driven via a helical gear, so if the cutting resistance increases due to the thickness or hardness of the sheet-like member, The blade of the second circle cutter automatically comes into stronger pressure contact with the blade of the first circle cutter due to the thrust force in the axial direction generated by the increase in the meshing pressure between the diagonal tooth surfaces of the helical gear. The pressing force is always maintained optimally in accordance with the cutting resistance of the sheet-like member, and therefore, a good cutting condition is always maintained regardless of the thickness, hardness, etc. of the sheet-like member.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a unit of a cutting device for sheet-like members according to the present invention, Fig. 2 is a front view of the same unit, and Fig. 3 a and b are diagrams for explaining the operation of the cutting device. FIG. 4 is a plan view showing an outline of the conventional cutting device. DESCRIPTION OF SYMBOLS 1... Sheet-like member, 10... First circle cutter, 11... Second circle cutter, 13... First drive shaft, 15... Frame, 16... Electromagnetic actuator, 17... Second drive shaft, 18... Drive helical gear, 19... Driven helical gear, 20...
cutting line.

Claims (1)

[Scope of utility model registration request] a rotatable first circle cutter disposed on one side of the sheet-like member to be relatively moved with its axis perpendicular to the moving direction; a rotatable first circle cutter disposed on the other side of the sheet-like member; a rotatable second circle cutter that sandwiches the sheet-shaped member and slides in pressure contact with the outer peripheral side surface of the first circle cutter to cut the sheet-shaped member in the moving direction; A sheet-shaped member cutting device comprising a moving means for moving the cutter from an operating position where the cutter slides in pressure contact with the cutter to a rest position separated from the first circle cutter, in which the second circle cutter is connected to a driven helical gear. At the same time, a driving helical gear is provided that meshes with the driven helical gear when the second circle cutter is in the operating position, and the direction of inclination of the tooth surfaces of the driving and driven helical gears is The drive torque of the drive helical gear causes the second circle cutter to move to the first position.
A cutting device for a sheet-like member, characterized in that the thrust force is generated in a direction in which the thrust force is pressed toward the side surface of the circle cutter.