JPS5822317B2 - Gripping device for objects to be cut - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gripping device for gripping an object to be cut when using a cutting device.

Gripping devices of this type firmly hold the object to be cut (hereinafter a stack of paper is shown as an example) against a surface supporting this stack in the vicinity of the working surface of the cutting knife, so that the paper can be cut during cutting. This is to prevent the stack from changing its position and to ensure that a clean cut is made at the intended location.

It is known to cause a clamping motion of a gripping device together with a cutting motion of a cutting blade.

The cutter is generally moved by pressing down on a pivot lever to accomplish the cutting process.

It is known to start by lifting said lever to its raised top dead center position and to use the first stroke part of the downward tilting of the lever to produce a pressing movement of the gripping device. , in most cases the stack is not cut at all or only slightly in this part.

The gripping device, usually a depressing bar, is mostly moved into its pressing position by the first part of the tilting movement of the pivoting lever, and the remaining tilting movement of the pivoting lever mostly depresses the knife to carry out the cutting process. .

This type of gripping device operation is only suitable for paper cutters with a limited knife length.

This is because this operation limits the length of the lever as the required pivoting angle of the pivoting lever increases, making it impossible to maintain easy and convenient manual actuation of the lever.

Furthermore, it is also known to decouple the actuation of the gripping device from the actuation of the pivoting lever for carrying out the cutting process, and to actuate the gripping device by a separate foot-operated lever.

Prior to and throughout the cutting process, the foot-operated lever is depressed, thereby gripping the paper stack.

This makes it expensive to manufacture and is not suitable for all local circumstances.

Furthermore, it is also known to effect the pressing movement of the gripping device by means of a bow-shaped band lever.

In this case, both ends of the band lever are rotatable on the frame of the cutting device about an axis parallel to the longitudinal direction of the holding beam, and are held down from above against the action of two return springs. It is connected to two eccentric discs which are mounted to actuate the beam.

In this manner, the band lever must be pressed down step by step throughout the cutting process, requiring the operator to perform the actual cutting with only one hand, which is particularly disadvantageous when cutting thick stacks of paper.

According to the present invention, there is provided a gripping device for an object to be cut having the following configuration.

That is, a surface that supports the object to be cut, a pressing bar that extends above this surface and is movable in the direction of the surface to press and grip the object to be cut, and a pressing bar that supports the object. for a detent having an actuating lever actuated to move in the direction, a detent actuated to prevent said restraining bar from leaving said surface, and a relaxation means manually actuated to release said detent action; The detent ratchet mechanism has a plurality of locking pawls that engage with the ratchet teeth, the locking pawls being offset from each other in the direction of extension of the ratchet teeth, so that: The number of different possible detent positions of the ratchet is configured to be equal to the number of actual ratchet teeth times the number of staggered locking pawls.

This construction provides fine-pitch actuation of the complete detent ratchet mechanism.
ion), there is no need to increase the number of teeth and reduce the pitch of the ratchet teeth, and therefore no weakening of the individual ratchet teeth.

With this gripping device, the paper stacks to be cut are, in principle, of different thicknesses, but as long as the thickness is within the range that can be cut by the cutting device, a substantially uniform pressing force is applied to the stacks of different thicknesses. should be applicable to each country.

This fully satisfies the gripping conditions.

This also reflects the fundamental requirement that a detent ratchet mechanism must be fulfilled, namely that the detent mechanism is actuated with virtually no play, in other words that the detent bar moves into its final depressing position. Once transferred, it does not spring back over any substantial distance, meeting the requirement that the detent function be as reliable as possible.

Preferably, the locking flanks of the ratchet teeth are beveled at an acute angle with the corresponding locking surface of at least the tip of any one of the locking pawls with which it engages.

This has the advantage that undercuts do not occur in the locking flanks of the locking ratchet teeth, and each locking pawl can be easily removed from its engaged position.

Only partial engagement of the tip of the locking pawl with the ratchet teeth is sufficient to provide the detent action, thereby further achieving the desired optimum immobility of the detent action.

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

With reference to the drawings, a gripping device for a cutter as a cutting device is shown in the form of a frame 2 with a horizontal surface 1, which supports a stack of paper (not shown) to be cut. do.

The cutter has a cutting blade 3 with a pressure bar 4 extending in the vicinity of the plane of movement of the cutting blade 3 and extending parallel to this plane for gripping the stack of paper during cutting. ing.

For this purpose, the suppression bar 4 is pressed against the surface 1 of the frame 2 in the direction of the arrow 5 in FIG.

An anvil blade 6 is fixedly arranged on the frame 2 parallel to the restraint bar 4 to cooperate with the cutting blade 3 during the cutting operation.

A gripping bar 7 is provided below the anvil blade 6 to be used as a bundle during transportation.

The suppression bar 4 is mounted between the two holder side plates 8 of the frame 2, and can move forward and backward in the direction of the arrow 5.

The return movement opposite to the direction of arrow 5 is achieved by the action of springs acting on both ends of the pressure bar (details not shown).
caused.

The upper surface 9 of the pressing bar 4 is pressed by the circumferential surfaces of two eccentric disks 10 at both end regions of the pressing bar.

The eccentric disk 10 is circular and is mounted so that it can rotate eccentrically around an axis 12.

The shaft 12 is located below the center 11 of the disc 10 and is displaced towards the plane of movement of the cutting blade 3.

This shaft 12 extends parallel to the longitudinal direction of the press bar 4 and is fixed to the holder side plate 8.

The two eccentric discs 10, only one of which is shown, are connected to each other by an actuating arcuate member 13.

This member 13 is rotated downward in the direction of the arrow 14 and separated from the plane of movement of the cutting blade 3, causing each of the eccentric discs 10 to rotate around the axis 12, thereby exerting an eccentric action and suppressing Pressing the bar 4 in the direction of the arrow 5, ie in the direction of the horizontal plane 1 of the frame 2, results in a firm grip on the stack of paper located in the space 15.

A detent ratchet mechanism 16 is arranged between one holder side plate 8 and the eccentric disk 10 and prevents the pressure bar 4 from moving away from the surface 1.

The detent mechanism 16 has a ratchet, the mode of operation of which will be explained in more detail with reference to FIGS. 4 to 7.

The detent mechanism 16 consists of a ratchet segment 18 and a locking pawl, which ratchet segment 18 has ratchet teeth 17 and is rigidly connected to the eccentric disc 10, for example by a bolt 19, so that:
It is rotatable around the shaft 12.

The center of the pitch circle of the ratchet teeth 17 is the eccentric disk 10.
It is located at the axial center of the rotating shaft 12.

Above the ratchet segment 18 are four locking pawls 20 mounted side by side on the holder side plate 8.
2L 22, 23, which are moved in the longitudinal direction, ie in the direction of the arrow 5 relative to the ratchet 17, side by side.

Meanwhile, the pawls 20-23 are guided between guides formed by support bolts 24.

The support bolt 24 has locking claws 20 to 23 on its circumferential surface.
Since the side surface 25 in the longitudinal direction is slidably supported,
As a result, the locking pawl does not move sideways or tilt.

The play provided to the pawls by these support bolts 24 during their guiding action is such that the locking pawls 20-23 can fall onto the ratchet teeth 17 due to their weight.

The tips 26 to 29 of the locking pawls 20 to 23 are offset from each other in the direction of extension 30 of the ratchet teeth, and the tips of two adjacent locking pawls 20 to 23 are spaced apart in the direction of extension 30 of the ratchet teeth. Same interval 31
has.

The tips 26 to 29 of the locking claws 20 to 23 are the locking surfaces 3
2 to 35, and these surfaces are along the direction of arrow 5.

The spacing 31 between two adjacent surfaces 32 to 35 of the locking pawls 20 to 23 allows the pitch 36 of the ratchet teeth 17 to be adjusted to the mutually staggered tips 26 to 29 of the locking pawls. It is equal to the value divided by the number of locking surfaces 32 to 35 of the pawl.

The width 37 of the ratchet segment 18 with ratchet teeth 17 substantially corresponds to the sum of the stacks of adjacent locking pawls 20-23.

Locking pawl 26 in the direction of extension 30 of the ratchet teeth
The number of possible different detent positions as a result of staggered tips 29 is equal to the number of teeth 38 on ratchet teeth 17 multiplied by the number of staggered tips 26-29 of locking pawls. be equivalent to.

The pawl-opposed flanks 39 of the ratchet teeth 38 are configured to contact the locking pawl tips 26-29.

The locking flank 39 of the tooth 38 (which in the detented position contacts one of the locking surfaces 32-35) has a corresponding locking surface 32-35, at least the locking surface of the tip 26 of the distal-most locking pawl 23. and Eimyo 41.

As shown in FIG.
2, and is engaged with a movable member when desired to prevent the locking pawls 20-23 from automatically engaging with the ratchet teeth.

The movable member includes an eccentric member 47 that protrudes from the end of the shaft 48 and is rotatable about an axis parallel to the axis of the shaft 12.

The through holes 43 to 46 provided in the locking pawl 23 have a diameter that matches the diameter of the circle drawn by the eccentric member 47 as the shaft 48 rotates.

The illustrated eccentric member 47 is formed by an eccentric stamp cut off at the end of the rotating shaft 48, and this stamp is formed by cutting out more than half of the shaft cross section.

A complete detent ratchet mechanism formed by ratchet segments 18 and locking pawls 20-23 is arranged between eccentric disc 10 and holder side plate 8.

The actuating end 49 of the pivoting shaft 48 is located on the side of the holder side plate 8 remote from the detent mechanism 16 and is provided with a manual operating lever 50 that projects radially outward.

In order to press and grip the stack of paper, the operating member 13 is rotated in the direction of arrow 14.

At the same time, the eccentric disk 10 is rotated around the shaft 12.

During this rotation, the ratchet segment 18, which is rigidly connected to the eccentric disc 10, rotates with the disc.

Tooth 38 of the ratchet tooth at the front in the direction of rotation 14
The rear surface 51 of the locking pawls 20 to 23 have tips 26 to 2 of them.
It is sloped at such an angle that it can pass under 9 and slide unhindered by these.

In order to enable such unhindered sliding, the locking pawls 20-23 are provided with a rear surface 51 of the teeth 38 in the region of their back surface 52 adjacent to the tips 26-29 in the direction opposite to the arrow 14. Equipped with a flat slope corresponding to

As a result, when the eccentric member 47 is rotated toward its bottom dead center position, the back surface 51 of the tooth 38 is moved from the tip to the back surface 52.
By sliding along the locking pawl 2, the locking pawl 23 is displaced upward.

This displacement is easily achieved by the relationship between the diameters of the through holes 43-46 and the circumferential surface of the eccentric member 47.

After the tooth 3B of one ratchet tooth has slipped, each tip 26-29 of the raised locking pawl 20-23 falls into the space 40 between this tooth and the next tooth 38.

As a result of the acute angle 41, as the ratchet segment 18 is rotated further, the tip slides along the locking flank 39 of the passing tooth 38 and prevents a return rotation of the ratchet 17 from the very beginning of sliding.

The member 13 is rotated in the direction of the arrow 14 until the eccentric disk 10 is in a position where it can no longer be rotated further by normal forces, in which position the suppression bar 4 is already firmly pressing against the paper stack. There is.

Thereafter, even if the force applied to the member 13 is released, the return rotation of the eccentric disk 10 will prevent the locking pawls 20- 23, it is prevented with virtually no springback.

After the cutting process has been completed, when it is necessary to release the pressure gripping action on the paper stack, it is only necessary to pivot the actuating lever 50 upwards (FIG. 6).

This brings the eccentric member 47 to its top dead center position.

During this action, the eccentric member 47 pushes all the locking pawls 20-23 upwardly, opposite to the arrow 5, so that the tips 26-29 of the pawls that were preventing the return rotation of the ratchet teeth 17 is released from contact with the locking flank 39 of the tooth 38 of the locked ratchet tooth, and the eccentricity is caused by the pressure caused by the bulge of the paper stack and by the return spring pushing up the pressure bar 4 from below. Disc 10 and member 13
is returned to its starting position as shown in FIG.

If nothing is provided between the eccentric disk 10 and the top surface 9 of the pressing bar 4 to perform a locking function, the above-mentioned return operation will normally occur automatically.

Before starting the next gripping operation, the actuating lever 50 of the eccentric member 47 is again rotated into its lower, illustrated position, so that the tips 26-29 of the locking pawls 20-23, due to their weight, engage the ratchet teeth. It falls again into 17 teeth.

[Brief explanation of drawings]

1 is a perspective view of a paper cutting device equipped with a gripping device according to the invention, and FIG. 2 is a partial plan view taken along arrow H in FIG. 1, including a detent ratchet mechanism. 3 shows the eccentric disc of the gripping device, and FIG. 3 is a sectional view taken in the direction of the arrow ■ in FIG. The figure is the third
This is a cross-sectional view similar to the figure, showing only the main parts, and showing the detent mechanism in an unlocked state. 6 is a sectional view taken along the line ■--■ in FIG. 5, and FIG. 1 is a detailed view similar to FIG. 5, but with the detent mechanism unlocked. 1... Surface, 2... Frame, 3... Cutting blade, 4...
... Pressure bar, 10 ... Eccentric disk, 16 ... Ratchet mechanism for detent, 17 ... Ratchet tooth, 2
0-23...Lock pawl, 47...Eccentric member.

Claims (1)

[Scope of Claims] 1. A surface for supporting an object to be cut, a pressing bar extending above this surface and movable in the direction of the surface to press and grip the object to be cut, and a pressing bar for suppressing the object. an actuating lever operated to move the bar towards said surface; a detent operated to prevent said pusher bar from moving away from said surface; and a relaxation means manually operated to release said detent. The detent ratchet mechanism has a plurality of locking pawls that engage with the ratchet teeth, and the locking pawls are offset from each other in the direction in which the ratchet teeth extend. and thereby the number of possible different detent positions of the ratchet mechanism is equal to the number of actual ratchet teeth multiplied by the number of said staggered locking pawls. gripping device. 2. The locking flank of the ratchet tooth is also inclined so that the slight scoop of any one of the locking pawls that engages therewith forms an acute angle with the corresponding locking surface of the tip. A device according to scope 1. 3. The locking pawls are arranged side by side with each other, and the width of the ratchet teeth substantially coincides throughout the stack of adjacent locking pawls.
The device according to paragraph 1 or 2. 4. The effective spacing in the extending direction of the ratchet teeth between the locking surfaces of each locking pawl that continuously engages with the ratchet teeth is constant between each locking surface, and the number of locking pawls with different spacing between the ratchet teeth. 4. A device according to any one of claims 1 to 3, characterized in that the number is equal to the number divided by . 5. According to any one of claims 1 to 4, the locking pawl is slidably mounted on the ratchet and automatically falls onto the ratchet due to the weight of the pawl itself. equipment. 6. Each locking pawl is provided with a through hole extending in its direction arranged side by side, and the relaxation means are received in these through holes to prevent the locking pawl from engaging the ratchet teeth. 6. The device according to claim 1, further comprising a member that can be selectively placed in a preventing position. 7 The ratchet teeth form part of a ratchet segment which is rigidly connected to an eccentric disc, said eccentric disc being pivotable by a pivoting movement of the actuating lever acting on a pressure bar, so that the ratchet 7. The device according to claim 1, wherein the center of the arc of the tooth pitch circle is on the rotation axis of the eccentric disk. 8. The device according to claim 7, characterized in that the locking pawl is arranged on the holder side plate of the frame of the cutting device, and this side plate functions as a bearing for the pivot shaft of the eccentric disc. . 9. Device according to claim 8, characterized in that the ratchet segment and the locking pawl are arranged between the eccentric disc and the holder side plate. 10. Said member of the relaxation means is selectively adjusted in position by manually actuated means located on the side of the side plate remote from the ratchet. The device described. 11. Said member of the relaxation means received in the through-bore is an eccentric member connected to a pivotable shaft, and the through-hole is arranged so that when the pivotable shaft rotates, the said member of the relaxation means is 11. Device according to any one of claims 1 to 10, characterized in that it has a diameter that substantially corresponds to the diameter. 12. Device according to claim 11, characterized in that the eccentric member is formed by an eccentric stamp cut off at one end of the pivoting shaft. 13. Claim 1, characterized in that each locking pawl is slidable in the direction of the ratchet teeth independently of each other.
The apparatus according to any one of items 1 to 12.