JP2970293B2 - Cutting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting apparatus for appropriately cutting a roll-shaped recording paper or the like used in an image forming apparatus such as a facsimile or a copying machine into a predetermined length.

[0002]

2. Description of the Related Art Conventionally, as a recording paper cutting apparatus of this type, as shown in FIG. 6, a longitudinal cutting edge of a lower blade unit 100 is sequentially arranged from one side (a cutting start end) to another side (a cutting start end). The upper blade unit 101 is mounted obliquely on the frame 102 with respect to the lower blade unit 100 so as to approach the upper blade unit 101 toward the cutting end portion, and the upper blade unit 101 is attached to a support shaft 105 described later. It comprises a scissors-type cutting section having a structure to be driven to rotate around, and a drive section having a motor and a gear for applying a rotational force thereto.

In this cutting apparatus, a lower blade unit 100 and an upper blade unit 101 are disposed between left and right side plate portions 102a and 102b of a frame 102, and are loosely fitted to one of pivot shafts 103 of the lower blade unit 100. Torsion coil spring 10
At 4, the blades of the two units 100 and 101 are urged so as to press against each other.

The upper blade unit 101 is connected to a frame 102
As means for rotatably supporting the left and right side plates 102a and 102b, as shown in FIG.
5 and the left and right sides of the upper blade unit 101 and the frame 1
02 so as to penetrate the left and right side plates 102a and 102b, and the retaining rings (snap rings) 106 and 106 are fitted so that the left and right ends of the support shaft 105 do not fall off the frame 102. .

A motor 110 and a gear drive system 120
130 is a side plate portion 102b of the frame 102
Attached to.

[0006]

However, in such a structure, the work of assembling and disassembling the upper blade unit 101 is troublesome, and the longer the length of the upper blade unit 101 becomes, the more the support shaft 105 becomes. There is also a problem that the length is increased, leading to an increase in weight and cost.

Further, since the drive system gear shaft 130 is fixed to the right side plate 102b by welding, caulking or the like, its position is different from the position of the hole for the pivot shaft 103 of the lower blade unit 100. Need to be provided, there is a problem with miniaturization,
This has led to higher costs.

An object of the present invention is to simplify the assembling and disassembling operations of this type of scissors-type cutting device and to reduce the size, weight, and cost.

[0009]

In order to achieve the above object, a cutting device according to the present invention has rotating shafts at both left and right ends, and is rotatably supported by a pair of left and right side plates, one of which is rotatable. A rotating blade body which is loosely fitted to one side plate of the pair of left and right side plates, and whose other rotating shaft has its upper surface side supported by a supporting portion provided on the other side plate, and has shafts at both left and right ends. A fixed blade body that is rotatably supported by the pair of left and right side plates, a spring body that presses both cutting edges of the rotating blade body and the fixed blade body, and the rotating blade body is rotated via a gear train. In a cutting device comprising a driving motor to be driven, the spring body is formed in a coil shape, and the other side plate of the fixed blade body is loosely fitted with a coil portion of the spring body on a side axis, and the side plate is mounted on the other side plate. Pressing the shaft of the gear train loosely fitted from the inside against the inner surface of the side plate,
The fixed blade is pressed against the inner surface of one side plate, and the other rotating shaft of the rotating blade is pressed and urged in the direction of the support of the side plate.

[0010]

In the cutting device of the present invention having the above-mentioned structure, the other side plate of the fixed blade is fixed to the rotary blade by the torsional action of the coil-shaped spring body loosely fitted on the shaft. The two blades of the blade body are brought into pressure contact with each other, and the pressing action of the coil portion presses the shaft of the gear train loosely fitted to the other side plate from the inside of the side plate against the inner side surface of the side plate, and the fixed blade body to one side. It also has a function of pressing against the inner surface of the side plate to prevent the lateral movement of the fixed blade body and the shaft of the gear train, thereby preventing the shaft from falling off.

[0011]

Next, an embodiment of the present invention will be described.

1 to 3, a cutting device 19 includes a fixed blade 37 having a left and right longitudinal cutting edge facing upward, and a rotating blade provided with a longitudinal cutting edge facing downward so as to face the longitudinal cutting edge of the fixed cutting blade 37. It comprises a moving blade body 38, gear trains 61 and 62 for transmitting a driving force to the rotating blade body 38, a driving motor 60, and a frame 36 supporting these.

The left pivot 40 of the lower blade frame 39 to which the fixed blade body 37 is attached is connected to the left side plate 3 of the frame 36.
6a, the right pivot shaft 41 of the lower blade frame 39 is fitted in a support hole 55 formed in the right side plate 36b of the frame 36. Each of the gear shafts 57 is rotatably supported by a support hole 59 provided at the center thereof. Short rotating shafts 44 provided on the left and right sides of the upper blade frame 43 to which the rotating blade body 38 is attached,
45, the left rotation shaft 44 is rotatably fitted into the round hole 46 of the left plate 36a, and the right rotation shaft 45 is
Dharma-shaped support hole 47 as a support portion formed in 6b
And the cutting edge of the fixed blade 37 and the rotating blade 38
The blades of the fixed blade 37 and the rotary blade 38 are arranged to be inclined at the shear angle θ so that the gap with the blade edge is larger on the left side plate 36a side and smaller on the right side plate 36b side. ing. Note that the anti-sticking piece 48 protruding upward from the end of the fixed blade body 37 comes into contact with the rotating blade body 38 on the side where the gap dimension is small.

The drive motor 60 is mounted on the right side of the frame 36, and the driving force from the drive motor 60 is inserted into the worm 61 mounted on the motor shaft and the right side plate 36b of the frame 36. Gear shaft 57
A helical gear (worm gear) 62 meshed with the worm 61 and rotatably fitted around a shaft 57, and further provided on the helical gear 62. The pin 65 and the right lever 5 of the upper blade frame 43
The upper lever frame 43 is pivoted about the axis of the rotation shaft 45 by rotating the right lever 50 of the upper blade frame 43 largely by fitting and coupling with a long hole-shaped pin operating hole 50a formed in the upper blade frame 43. Rotate.

The left and right rotating shafts 4 of the upper blade frame 43
4 and 45 are provided such that the free end of the right rotation shaft 45 projects toward the inside of the upper blade frame 43, and the left rotation shaft 44 projects outward from the upper blade frame 43. And, as a locking portion for preventing the right rotation shaft 45 from falling out of the daruma-shaped support hole 47,
An annular groove 53 is formed on the middle outer peripheral surface of the right rotation shaft 45.

In the present embodiment, as shown in FIGS. 2 and 3, the annular groove 53 is set so as to be rotatably fitted in the small diameter portion 47a on the upper side of the darma-shaped support hole 47.
As a result, the upper blade frame 43 and, consequently, the rotating blade body 38 are prevented from being displaced in the longitudinal direction of the fixed blade body 37.

The fixed blade 37 and the rotary blade 38
The torsion coil spring 49 as a spring body for urging the blades so that their both edges press against each other has its coil part loosely fitted to the right pivot shaft 41 and extends in the left-right direction of the coil part. The lower blade frame 39 is urged toward the left side plate 36a by the spring force to be applied, and the gear shaft 5
7 is urged in the direction of the other right side plate 36b, and one end locking portion 49a of the torsion coil spring 49 is pressed and locked to the back surface of the lower blade frame 39, and the torsion coil spring 49 is pressed.
The other end locking portion 49b of the upper blade frame 43 so as to be pressed upward from the lower surface side of the right rotation shaft 45,
The lower blade frame 3 is prevented from falling off from the small-diameter portion 47a in the darma-shaped support hole 47, and the fixed blade body 37 and the rotating blade body 38 are pressed against each other.
9 is given a rotational bias.

The left and right side plates 36a of the frame 36,
L1 is the distance between the inner surfaces of 36b, t is the thickness of each side plate 36a, 36b, T is the height of the flange portion of the shaft 57, and T is the distance between the bases of the left and right pivot shafts 40, 41 in the lower blade frame 39. L2, the distance between the tip of the left pivot shaft 40 and the root of the right pivot shaft 41 is L3, from the tip (free end) of the left rotary shaft 44 to the free end of the right rotary shaft 45 in the upper blade frame 43; Is L4, the relationship between these distances is as follows.

L1 + t <L4, L3 + (the contact length of the coil portion of the spring 49) <L1−T <L2 + (the free length of the coil portion of the spring 49) To assemble the cutting device 19 having the above configuration, first, The coil portion of the torsion coil spring 49 is loosely fitted to the right pivot shaft 41 of the lower blade frame 39, and the pivot shaft 41 is attached to the left plate 3
6b is inserted into the support hole 59 of the gear shaft 57 previously inserted into the support hole 55 of the gear 6b.
a into the support hole 42 of FIG. At this time, the lower blade frame 3
9 is pressed against the left side plate 36 a by the pressing force of the torsion coil spring 49, but the right pivot shaft 41 does not fall out of the support hole 59 of the gear shaft 57 inserted into the support hole 55 of the frame 36. Absent.

Next, after the helical gear 62 is inserted into the gear shaft 57 projecting outside the right side plate 36a, the left rotating shaft 44 of the upper blade frame 43 is inserted into the circular hole 46 from the inner side of the left side plate 36a. And the right rotation shaft 45 is attached to the right plate 36b.
From the outside, the pin 65 of the helical gear 62 is fitted into the long pin-shaped operation hole 50a of the right lever 50, and then slightly pushed upward. Thereby, the torsion coil spring 49 is positioned at the position where the annular groove 53 of the right rotation shaft 45 is fitted in the small diameter portion 47a.
When the other end locking portion 49b is brought into contact with the lower surface of the right rotation shaft 45 and the one end locking portion 49a is brought into contact with the back surface of the upper blade frame 43, the torsional reaction force of the torsion coil spring 49 causes The anti-sticking piece 48 and the rotating blade body 38 of the fixed blade body 37 are urged so as to press against each other, and the right rotation shaft 45
The small-diameter portion 47 of the support hole 47 that is also a support portion of the right side plate 36a.
It does not fall off from a.

FIGS. 4 and 5 show a second embodiment. In this embodiment, the right rotary shaft 4 of the upper blade frame 43 is provided.
5 is inserted into an elongate support hole (support portion) 77 of the right side plate 36b, and an annular groove 74 provided in the rotary shaft 45 is inserted.
However, the other end locking portion 49b of the torsion coil spring 49 is engaged in the annular groove 74 so as to be located on the inner surface side of the right side plate 36b. According to this aspect, when the rotation shaft 45 moves in the removal direction (right direction), the other end locking portion 49b contacts the inner surface of the right side plate 36b in a state where it is located in the annular groove 74. Can be prevented.

The one end locking portion 49a of the torsion coil spring 49 abuts on the front side of the lower blade frame 39 below the pivot 41 so that the fixed blade body 37 and the rotating blade body 3 are fixed.
A torsion force may be applied so that the two cutting edges 8 and 8 are pressed against each other.

[0023]

As described in detail above, according to the cutting device of the present invention, the length of the rotating shaft can be shortened regardless of the length of the rotating blade, and the rotating blade can be reduced. The body can be easily attached to the side plate, and the assembling and disassembling operations can be performed easily and quickly. By the action of the spring body, not only the fixed blade body and the rotating blade body are pressed against each other, but also the horizontal movement of the fixed blade body and the shaft of the gear train are prevented, so that both of them fall off. It also has the function of preventing. Therefore, there is no need to provide independent shaft support mechanisms on the side plates to support the shaft of the gear train and the shaft of the fixed blade body, and the size and weight of the entire apparatus can be reduced. In addition, since the shaft of the gear train is loosely fitted to the side plate and is pressed and supported by a spring body loosely fitted to the shaft of the fixed blade body, there is no need for welding or caulking or the like, so that it can be manufactured inexpensively and easily. Has excellent effects.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cutting apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the cutting device.

FIG. 3 is a side view seen from line AA of FIG. 2;

FIG. 4 is a sectional view of a main part of a cutting apparatus according to a second embodiment.

FIG. 5 is a side view as viewed from the line BB in FIG. 4;

FIG. 6 is a perspective view of a conventional cutting device.

[Explanation of symbols]

 Reference Signs List 14 recording paper 19 cutting device 36 frame 36a left side plate (one side plate) 36b right side plate (other side plate) 37 fixed blade body 38 rotating blade body 39 lower blade frame 40 left side pivot shaft (one side plate shaft) 41) Right pivot shaft (axis of the other side plate) 43 Upper blade frame 44 Left rotation shaft (one rotation shaft) 45 Right rotation shaft (the other rotation shaft) 46 Round hole 47, 77 Support hole (support portion) ) 47a Small diameter portion 49 Torsional coil spring (spring body) 49a, 49b Locking portion 50 Right lever 50a Pin operating hole 53, 74 Annular groove 55 Support hole 57 Gear shaft (gear train shaft) 59 Support hole 60 Drive motor 61 Worm 62 Helical gear 65 Pin

Claims (1)

(57) [Claims] 1. A rotating shaft is provided at both left and right ends, and is rotatably supported by a pair of left and right side plates. One rotating shaft is loosely fitted to one of the pair of left and right side plates, and the other rotating shaft. A rotating blade body whose upper surface is pressed and supported by a supporting portion provided on the other side plate, a fixed blade body having shafts at both left and right ends and rotatably supported by the pair of left and right side plates; A cutting device comprising: a spring body that presses both cutting edges of the rotating blade body and the fixed blade body; and a drive motor that rotationally drives the rotating blade body via a gear train, wherein the spring body has a coil shape. The other side plate of the fixed blade body is loosely fitted with a coil portion of a spring body on a shaft, and the shaft of the gear train loosely fitted on the other side plate from the inside of the side plate is pressed against the inner surface of the side plate. And presses the fixed blade against the inner surface of one of the side plates, and further presses the fixed blade against the other side of the rotating blade. Cutting apparatus, wherein a rotary shaft and configured to press urging the supporting portion direction of the side plate.