RU31189U1 - MANUAL CUTTING ELECTRIC SCISSORS - Google Patents

Description

MANUAL CUTTING ELECTRIC SCISSORS

The utility model relates to light industry and is intended for use mainly in dressmaking sewing production by manually cutting clothes directly on a person or on a mannequin.

Known manual cutting electric scissors and similar devices for cutting sheet materials (fabrics, rubber, linoleum, etc.), containing a body with a handle, a circular knife with an electric drive for its rotation, oporno-guiding foot (terminological options: sole, platform, base) with a nose sharpening and with a longitudinal groove (slot) for a circular knife mounted on the body by means of a rack (terminological options: holder, bracket), and a device for sharpening a knife. 1-6.

Closest to the claimed utility model for the intended purpose and the totality of essential design features are manual cutting electric scissors containing a body with a handle, a circular knife with a drive for its rotation, a supporting-guide foot with a nose pointed and with a longitudinal groove for a circular knife mounted on the housing by means of a stand and knife sharpener 7.

It does not contain any information about the presence of a counter knife (probably, the side edge of the mentioned groove is used as such), and the support-guide foot is fixed (rigid), and the outer (lower) surface of the foot is uniformly flat and smooth.

However, the prototype device does not have sufficiently high technical and operational characteristics: when cutting material directly on a person or mannequin, as well as on any supporting surface with a brightly colored A41 H 31/00; 26 V 25/00;

With a macro-relief, the foot does not “track the terrain and does not use the possibility of better cutting and, in addition, as the cutting edge of the disk knife is worn as a result of interaction with the material and, especially, as it is sharpened, the cutting conditions change and even if there is a counter knife, an increase the gap between the knives due to the specified wear is not compensated; In addition, knife jamming is not uncommon when cutting relatively thick and dense material.

The task to which the claimed utility model is directed is to expand the technical and operational capabilities of manual cutting scissors by providing the ability to "track the macro-relief of the supporting surface, within certain limits, with a foot (with the same or close to the same position of the body with the handle), and stabilization and self-regulation of the cutting mode for a material with the same properties and in the range of different properties, in particular different thickness (different number of layers).

The solution to this problem is achieved by the fact that manual cutting scissors containing a body with a handle, a circular knife with a drive for its rotation, a support-guide foot with a nose pointed and with a longitudinal groove for a circular knife mounted on the housing by means of a rack, and a device for sharpening a knife, equipped with an opposing knife mounted on the said rack and pressed against the disk knife, and the supporting-guide foot is installed with the possibility of elastic-return, at least two-sided roll with external forces m exposed to it.

The problem is also solved due to a number of additional sets of features of the device, based on the specified set of main features:

- the counter-cutting knife can be elastically pressed against the disk knife, which provides automatic compensation for the gap that occurs when adjusting the axial location of the disk knife as a result of sharpening and replacing it with a knife with a different cutting edge, as well as relative stability and self-regulation of the interaction force of the disk and counter knives when cutting materials with different properties and different thicknesses;

- the counter-cutting knife can be installed on the end of the leaf spring, its other end attached to the side surface of the rack and placed in the additional zone of the longitudinal groove under the circular knife to the side of it.

3

which is rational for reasons of compactness, reliability and structural simplicity of the device;

The support-guide foot can be connected to the stand by means of longitudinally oriented hinges and a flexural-elastic rod mounted transversally with its central part in the rack, while its ends are built into the foot nests provided on the additional lateral surfaces of its groove, which together leads to a compact and reliable connection of the foot with the rack with the realization of the possibility of elastic-return roll of the foot in a fairly wide range - up to ± 10-15 °;

-Lap can be equipped with support-guide rollers, thereby reducing the resistance to the forward movement of the foot on the base surface under the material being cut, and also yaw of the foot when moving along macro-irregularities and when asymmetric folds of clothing material or human skin under the foot are formed;

- one pair of support-guide rollers with a common axis offset from the contact point of both knives to the back of the foot can be provided, which, with the relative simplicity of the “roller design, facilitates the manual operational control of the angle of attack of the foot in the macro-relief of the base surface and unpredictable“ behavior of the cut material during the cutting process, especially during forced turns of the device along small radii.

The claimed device is presented in the drawings by examples of structural design:

in FIG. 1 shows a general view (in a perspective view) of manual cutting electric scissors, where A is the cutting direction, and f are the roll angles of the support-guide foot relative to its initial (horizontal) position;

in FIG. 2 shows an exploded cutter;

in FIG. 3 - diagram of the elastic-return roll of the foot with external force acting on it, where F is the active force (from the side of the hand holding the electric scissors), N is the reaction force in the contact of the support-guide foot with the base surface, M is the moment of forces F and N when they diverge along the axis of the disk knife;

in FIG. 4 is a side view of the design of the support-guide foot with a pair of support rollers integrated in its rear part;

Manual cutting scissors contain (see figure 1) the housing 1 with a handle 2, covering its rear part. On the head of the housing 1, on the side, on the axis 3, oriented horizontally and transversely with respect to the cutting direction A, a disk knife 4 is mounted. The latter is connected to its rotation drive, which primarily includes an electric motor 5 and a worm pair 6 ( see Fig. 2), electrically connected to the current source through the push-button switch 7. Behind the knife 4, the L-shaped rack 8 ("holder," bracket or other substitute term) is fixedly attached to the housing 1 so that it is located under the knife 4 , in a plane perpendicular to axis 3, t. . with longitudinal orientation (A). On the free end of the rack 8 is installed, with the same orientation (A) and with the possibility of an elastic-return, at least two-sided roll φ ± 1015 ° relative to the initial horizontal position when the force is applied to it - the moment M is a pair of forces F and N (cm Fig. 3), the support-guide foot 9 ("sole," platform, "plate," base or other substitute term) with a nasal sharpening and a flat external (that is, facing away from knife 4) surface. In the foot 9, a longitudinal groove 10 is provided under the knife 4 (more precisely, under its cutting edge 11). “At least - because trim in a narrow angular range is not excluded.

The stipulated possibility of an elastic-return roll of the foot 9 is provided in the rational constructive embodiment of FIG. 1,3, firstly, by the fact that the tab 9 is mounted on the stand 8 by means of longitudinally oriented hinges 12 and 13 (see Fig. 1) and, secondly, by the fact that it is connected to the stand 8 by means of a bending-elastic rod 14 mounted centrally in the strut 8 transversely (i.e. parallel to axis 3 and perpendicular to direction A), while the ends of the rod 14 are built into the slots 15, 16 of the tab 9 provided on the additional side surfaces of the groove 10.

In a preferred embodiment, the foot 9 is provided with support rollers, for the most part recessed under the external horizontal surface of the foot 9. The axes of their rotation are parallel to axis 3. A design with one pair of rollers, -17, 18, offset from the projection of the cutting zone of the scissors on a common plane, is recommended. the axes of these pairs (see Fig. 4,5). However, in some cases, the device with two pairs of rollers spaced relative to the above projection (not shown) has its advantages.

673

The electric shears are equipped with a counter knife 19 mounted on a stand 8 and pressed against a disk knife 4. A design with elastic pressing of the knife 19 against the knife 4 is advisable. In this case, the knife 19 is mounted on the end of the leaf spring 20, the other end of which is attached to the side surface of the rack 8 and placed in the additional zone of the groove 10 on the side of the cutting edge 11 of the knife 4 (see Fig. 1).

The structure of the electric scissors also includes a device for sharpening the knife 4: in the presented construction example, not shown in FIG. 1 abrasive element (grindstone) 21 (see Fig. 2) is mounted on the spring-loaded end 4 of the spring-loaded end (spring 22 in Fig. 2) in the axial direction of the pusher 23 mounted in the housing 1 parallel to axis 3 away from the spot contact of the knives 4 and 19 (in the cutting zone of the scissors), with the possibility of entering into interaction with the cutting edge of the knife 4 when pressing with a finger on the free end (at the base of the footnote line pos. 23 in Fig. 1), which can be arranged in button view.

The described structural example of the device does not exclude other possible options within the claimed combination of essential structural features.

The device operates as follows.

When cutting sheet material on a relief surface (mainly cutting fabric when making clothes directly on a mannequin or on a person), the electric scissors are held by the handle 2, turning the switch 7 on and off with their fingers, and lead (“manual driving of the electric scissors), generally changing the position in space, so that the outer flat surface of the foot 9 is adjacent to the base surface (the surface of the mannequin or the body of a person with or without clothes), and the material to be cut is located on the foot 9 and when the scissors move in the direction cutting (A) falls under the cutting edge 11 of the knife 4 at the point of contact of the latter with the opposing knife 19, along the line of preliminary marking.

The removal (deviation) of the initial position of the disk knife 4 along the axis 3 due to disassembly and assembly or other adjustments, replacing the knife 4 with another, and also as the device wears out during cutting and, especially, sharpening, 21-23, and the corresponding tendency to change the distance between knives 4, 19, is compensated by automatically pressing the knife 19 to the knife 4 with a spring 20.

In the absence of a shoulder between the active force F and the reaction N (see Fig. 3), the elastic rod 14 holds the tab 9 in the initial horizontal position (i.e. equidistant from the axis 3 of rotation of the knife 4). When a moment M occurs, a pair of forces F and N due to a change in the macrorelief of the base surface in the absence of a roll of the body 1 (for example, when cutting clothes in the area of female breasts or buttocks), tab 9 is rotated by the corresponding angle φ, i.e. according to the provided degree of freedom on the hinges 12, 13, while elastically bending the cantilever parts of the rod 14. Thus, the relief of the base surface “is tracked by the tab 9, at least in transverse planes, which improves the accuracy of cutting.

A similar picture will be observed when the thickness of the material changes in the place of the current section: “bursting of the material with an increase in its thickness is also an external force on the foot 9, generating moment M and, accordingly, the spring-back roll of the foot 9.

The longitudinally oriented hinges 12, 13 eliminate the passive yaw of the foot 9 and its elastic displacement up and down harmful to the cutting technology. The rollers 17, 18 reduce the friction of the tab 9 on the base surface and, when the surface is deformed, serve as additional longitudinal (in the direction A) guides. With the rear location of the pair of rollers 17, 18, manual adjustment of the angle of attack of the foot 9 is facilitated, when resting on the rollers.

If necessary, operational, in-place sharpening of the cutting edge 11 of the knife 4, use your finger to press on the free end of the pusher 23 (button), overcoming the force of the spring 22 and providing the required axial pressure force of the element 21 on the knife 4 (the finger is not released until the end of the sharpening or its stage).

Using the utility model allows to expand the technical and operational capabilities of the device by providing the possibility of “tracking the macro-relief of the supporting surface, within certain limits, with a foot (with the same or close to the same position of the body with the handle), as well as stabilization and self-regulation of the cutting mode for a material with the same properties and in a range of different properties, in particular different thicknesses (different number of layers).

SjOOb {G 5

Sources of information taken into account:

1.SU672017A1, B26V 25/00, 07/05/1979.

2.SU 710795 A1, V26V 25/00, 01/25/1980.

3.US 4662069, B26B 25/00, 1987.

4.SU 1666293 A1, B26D1 / 04, 02.23.1988.

5.SU 1581577 A1, B26B 25/00, 06/10/1988.

6.US 3602990, B26B 15/00, 1971.

7.SU1768384 A1, B26B 15/00, 25/00, 10/29/1990 (prototype).

Claims (6)

1. Manual cutting scissors containing a body with a handle, a circular knife with a drive for its rotation, a supporting guide foot with a nose pointed and with a longitudinal groove for a circular knife mounted on the housing by means of a stand, and a knife sharpener, characterized in that they are equipped an opposing knife mounted on the aforementioned stand and pressed against the disk knife, and the supporting-guide foot is installed with the possibility of elastic-return, at least two-sided roll with external force impact on it. 2. Electric shears according to claim 1, characterized in that the counter knife is elastically pressed against the disk knife. 3. Electric shears according to claim 2, characterized in that the counter knife is mounted on the end of the leaf spring, its other end attached to the side surface of the rack and located in the additional zone of the longitudinal groove under the circular knife to the side of it. 4. Electric scissors according to claim 1, characterized in that the support-guide foot is connected to the stand by means of longitudinally oriented hinges and a flexural-elastic rod mounted transversally with its central part in the rack, while its ends are built into the foot nests provided on additional side the surfaces of her groove. 5. Electric shears according to claim 1, characterized in that the foot is provided with support rollers. 6. Electric shears according to claim 5, characterized in that one pair of support-guide rollers is provided with a common axis offset from the contact spot of both knives to the back of the foot.