JPH0349719B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is suitable for cutting bread, flour products such as castella and cakes, pastry products such as cheese and ham, or vegetables (hereinafter referred to as bread etc.). This invention relates to a reciprocating cutting device.

[Conventional technology]

As a cake cutting device, a turret with multiple cutting blades parallel to each other is equipped with a crank mechanism.
A reciprocating cutting device is known that cuts the cake by horizontally reciprocating the cutting blade in the length direction.
(Special Publication No. 56-28678).

[Problem that the invention seeks to solve]

The cutting blade of the above-mentioned cutting device slows down in the vicinity of its turning point (near the top dead center and bottom dead center of the crank) and stops momentarily at the turning point, so its cutting form is not sharp enough. There are problems in that the cut goes from a good cut to a forced cut, or something close to it, which impairs the sharpness, and the cut surface is not smooth, causing unevenness and lowering the commercial value.

[Means for solving problems]

In order to solve the above problems, the present invention provides a reciprocating cutting device that cuts an object to be cut, such as bread, by reciprocating the cutting blade in the longitudinal direction relative to the frame using a drive device. A convex cam with a middle part with a large radius of curvature between both ends with a small radius of curvature is installed on either side of the cutting blade.
A plurality of intermediate portions are provided to protrude in the direction of the cutting edge of the cutting blade, and the other of the frame and the cutting blade is guided by the guide surfaces on the front and back surfaces of the cam to cause the cutting blade to make a convex reciprocating motion in the direction of the cutting edge. A plurality of cam follower mechanisms are provided corresponding to the cams, respectively.

[Effect]

When the drive device is activated, the cutting blade reciprocates in its length direction. At this time, the cam follower mechanism moves the front and back sides of the cam, which has an intermediate part with a large radius of curvature between both ends with a small radius of curvature. Guided by the guide surface of the surface, it moves relative to the cam, causing the cutting blade to make a convex reciprocating motion in the direction of the cutting edge. In the above operating state, when the object to be cut, such as bread, is moved relative to the cutting edge of the cutting blade, the cutting blade will
The direction of movement is changed at one turning point, and when the turning point is turned back, the cutting edge is guided by one end of the cam with a small radius of curvature and rapidly approaches the uncut part of the workpiece. is guided by the middle part of the large cam and moves to cut the object. Thereafter, the cutting blade is guided by the other end of the cam with a small radius of curvature and retreats in the direction of relative movement of the workpiece at the same speed as the workpiece or faster than the workpiece, cutting the workpiece. The cutting point is brought into contact with the cutting point, or the cutting point is separated from the cutting point to reach the other folding point. Then, the direction of movement is changed again, and the object is cut in the same manner as described above.

〔Example〕

1 to 8 show one embodiment of the present invention, and this reciprocating cutting device includes a plurality of cutting blades 1, a tool rest that supports the cutting blades 1 in parallel to each other, and a turret that supports the cutting blades 1 in parallel with each other. A drive device 3 that reciprocates the tool rest 2 in the length direction of the cutting blade 1, a convex cam 4 that guides the tool rest 2, and a drive device 3 that moves the object W to be cut, such as bread, toward the cutting blade 1. The main body is a transfer device 5.

As shown in FIG.
One end of the slit 8a is fitted into the slit 8a formed in the slit 8a, and the fastening protrusion 6 is fitted into the groove 9a of the fastening fitting 9.The other end is fitted into the slit 10a formed in the other support member 10 of the tool post 2. The retaining protrusion 7 is fitted into the groove 11a of the spring plate 11, and is removably attached to the tool rest 2. The support member 8 is fixed to the frame 12 with fixing bolts 13,
The other support member 10 is adjustable in the left-right direction in FIG. 3 with an adjustment bolt 14 and is fixed to the frame 12 with a fixing bolt 15. The frame body 12
is integrally attached to a movable member 17 having two pairs of front and rear cam follower mechanisms 16 (FIG. 4) on its sides, and together with the movable member 17 and the support members 8 and 10, constitutes the tool post 2. There is.

As shown in FIG. 5, the cam 4 has an intermediate portion B with an infinite radius of curvature, that is, a straight line, between both end portions A and A with a small radius of curvature (large curvature), and guides the front and back surfaces. The surfaces 4a and 4b are attached to the upper and lower sides of the upper frame 18 with their intermediate portions B projecting in the direction of the cutting edge 1a of the cutting blade 1, that is, downward, and attached to the upper and lower sides of the cam follower mechanism 16. , 16b to the upper guide surface 4a and lower guide surface 4b, and then remove the tool rest 2.
is configured to guide the cutting blade 1 and cause the cutting blade 1 to reciprocate.

Here, the upper and lower guide surfaces 4a of the end A of the cam 4,
To explain the shape of 4b, the upper guide surface 4a
is formed into an arcuate surface with a radius Ra, and the lower guide surface 4b is formed at a distance D (= r _a
+r _b +t) Radius R _b centered on the lowered position Ob
It is formed on a circular arc surface of (=R _a −r _a −r _b ).

However, r _a is the radius of the cam follower 16a, r _b is the radius of the cam follower 16b, and t is the thickness of the cam 4 at a position perpendicular to the cam 4 from the center O _a .

In addition, the upper and lower guide surfaces 4a and 4b of the intermediate portion B are
They are formed parallel to each other at intervals of t.

In the above configuration, the pair of upper and lower cam followers 16
a, 16b are always the upper and lower guide surfaces 4 of the cam 4.
a, 4b to keep the posture of the tool rest 2 horizontal.

Further, the drive device 3 includes a continuously variable speed motor 20 provided on the lower frame 19, a pulley 21 on the motor 20, a transmission belt 22, and a pulley 23.
Crankshaft 24 (Fig. 7) communicated via
and a crank rod 25 having one end attached to the crankshaft 24. The other end of the crank rod 25 is connected to a horizontal pin 26 (sixth
) is connected to the movable member 17 of the tool rest 2 via a joint 27 and a vertical pin 28, and the rotation of the crankshaft 24 by the motor 20 moves the cutting blade 1 in the length direction through the tool rest 2. It is designed to be moved.

Furthermore, the transfer device 5 includes an upper frame 18
A lifting platform 31 that is moved up and down by a cylinder 30 along corner guides 29 provided on the lower frame 19 has a receiving member 32 for the workpiece W to be cut, and a pressing member 33 for holding down the workpiece W on the receiving member 32. is attached so that the object W to be cut can be raised toward the cutting blade 1. The receiving member 32 and the holding member 33 are wire-shaped or band-shaped, and are arranged in plural in parallel with a movement gap of the cutting blade 1 (not shown in FIG. 1). 32 is fixed to the lifting platform 31, and
The latter presser member 33 is attached to the rotating shaft 3 on the lifting table 31.
4, and is urged to rotate clockwise in FIG. 1 by an urging mechanism 35 using a spring or the like. Further, an operating lever 36 is attached to the rotation shaft 34, and when a push rod 37 provided on the lower frame 19 is pushed to the right in FIG. 1 against the elasticity of a return spring 38, the operating lever 36 is pushed, the presser member 33 falls to the left in FIG.
The structure is such that the object W to be cut can be placed on the receiving member 32 from above.

In addition to the above, this reciprocating cutting device includes a balance table 40 (Fig. 4) that absorbs the inertia of the vertical movement of the tool rest 2, and a crank rod 25 that absorbs the inertia of the tool rest 2 in the horizontal direction. In order to maintain the balance of the mass of the balance mechanism 41 (seventh
) is provided.

The balance table 40 has a pair of upper and lower cam followers 43, 43 in contact with the upper and lower surfaces of a balance cam 42 which has the same shape as the cams 4 and has a convex shape under each cam 4. It is connected to the vertical pin 28 and is connected to the tool rest 2.
It moves upside down and absorbs the vertical inertia of the tool post 2.

On the other hand, the balance mechanism 41 is formed to have the same diameter as the gear 44 attached to the crankshaft 24 and includes a balance weight 45.
A balance gear 46 meshed with the balance gear 46, a balance gear 48 formed to have the same diameter as the balance gear 46 and equipped with a balance weight 47, a balance gear 48 meshed with the balance gear 46, A balance gear 50 formed and provided with a balance weight 49 and meshed with the balance gear 46; and a balance gear 50 formed with the same diameter as the balance gear 50 and provided with a balance weight 51 and meshed with the balance gear 48. The gear 52 rotates in synchronization with the crankshaft 24 to absorb the lateral inertia of the tool rest 2 and to maintain the mass balance of the crank rod 25. Balance mechanism 4
1 is provided symmetrically around the crank rod 25, so that it does not generate a couple.

In addition, the reference numeral 53 in FIG. 6 is a spring that smooths the vertical movement of the tool rest 2 and the balance table 40, and the reference numeral 54 in FIGS. A presser spring that presses the side end surface of the object W,
Reference numeral 61 in FIG. 1 is a vibration-proof rubber.

Next, the operation of the reciprocating cutting device according to the present invention configured as described above will be explained.

From the state shown in FIG. 1, push the push rod 37 to the right, tilt the presser member 33 to the left, insert the object W to be cut through the insertion opening 39, and return the push rod 37 to its original position. 35 to make the object W to be cut erected and stabilized on the receiving member 32.

After the above operation is completed, the drive device 3 is operated to cause the cutting blade 1 to make a reciprocating downward convex movement along the cam 4, while extending the cylinder 30 to extend the workpiece W.
slowly rise towards the cutting blade 1. The cutting blade 1 is located at one end A of the cam 4 having a small radius of curvature.
When the cam 4 passes the turning point while being guided by the cam 4, it rapidly descends along the end A of the cam 4, and then moves straight along the straight intermediate part B to cut the object W. In this way, the cutting blade 1 that has moved in a straight line
is guided by the other end A of the cam 4 and rises faster than the workpiece W, moves away from the cutting part of the workpiece W, reaches the other turning point, and descends again to cut the workpiece W. disconnect. Therefore, when the moving speed is zero or a slow speed close to zero, the cutting blade 1 retreats upward, moves away from the cutting part of the object W, and does not directly participate in cutting, and only when the moving speed is fast. ,
This means that the cutting part of the object W to be cut is touched and cut, and the entire object W to be cut is cut by pulling.

Note that if the cam 4 is simply arc-shaped and does not have an intermediate portion B with a large radius of curvature, when the feed speed of the object W to be cut is the same as the retreating (rising) speed of the cutting blade 1, the cutting stroke of the cutting blade 1 Not only is the latter half completely wasted, but depending on the type of workpiece W, the cutting blade 1 may return to the place where the cut has been made and make a new cut, resulting in a striped pattern on the cut surface. However, in the present invention, only the end portions A, A of the cam 4 are formed in an arc shape with a small radius of curvature, and the middle portion B is approximately straight, so the above situation is avoided. At the same time, the effective cutting section becomes longer and high cutting efficiency can be obtained. The cut object W is taken out from above the cutting blade 1, but since the cutting edge 1a of the cutting blade 1 is directed downward, there is no danger and it is safe.

FIG. 9 shows an example in which three cam followers 16 are guided by the cam 4. In this case, since the member 56 provided with the cam followers 16 changes its posture as it moves, the tool rest 2 Front and rear members 5
6 and 56 with a pivot 57.

In addition, although the structure shown in the figure is such that the object W to be cut is raised while the cutting blade 1 is reciprocated in the horizontal direction, the direction of movement of the cutting blade 1 and the object W to be cut is limited to this. In addition, the object to be cut W is fixed at a predetermined position, and the object to be cut is cut by moving the cutting blade 1 in the direction of the cutting edge 1a while moving the cutting blade 1 back and forth in the length direction of the object. You can also. Also, the middle part B of the cam 4 in the figure
is linear, but it can also be substantially linear with a large radius of curvature. end A of the cam 4;
Even if the guide surfaces 4a and 4b of A and intermediate portion B are curved, they are not limited to circular arcs, and may also be involute curves or the like. A heater is usually attached to the cutting blade. Furthermore, in the above example, the retreating (ascent) speed of the cutting blade 1 near the turning point is faster than the transporting (ascending) speed of the object W to be cut. Even when the transport speed is the same as that of the object W to be cut, it is possible to avoid pushing the object W to the point of being cut, so the object W can be cut in this manner. Furthermore, instead of the cylinder 30 of the transfer device 5, it is rotated by a motor. Lifting platform 31 using ball screws and chains
The transfer device is not limited to the one shown. It goes without saying that the holding mechanism for the object W to be cut, the fixing mechanism for the cutting blade, etc. are not limited to those shown in the drawings, but are arbitrary.

〔Effect of the invention〕

As explained above, the reciprocating cutting device of the present invention is a reciprocating cutting device that cuts an object to be cut, such as bread, by reciprocating the cutting blade in the longitudinal direction relative to the frame by a drive device. A plurality of convex cams are provided on either one of the cutting blades and an intermediate portion with a large radius of curvature is provided between both ends with a small radius of curvature, with the intermediate portions protruding in the direction of the cutting edge of the cutting blade, A plurality of cam follower mechanisms are provided on the other side of the frame and the cutting blade, respectively corresponding to the cams, for causing the cutting blade to reciprocate convexly in the direction of the cutting edge by being guided by the guide surfaces on the front and back surfaces of the cam. The structure is such that the relative transport speed of the object to be cut with respect to the cutting edge of the cutting blade is adjusted appropriately, and when the cutting blade is near the turning point of reciprocating movement, the cutting blade moves backward and away from the cutting part of the object, and when the cutting blade is near the turning point of the reciprocating movement, When the speed of movement has increased sufficiently,
Since the blade can be brought into contact with the cut part of the object again and cut it, the cutting blade can exhibit sharpness, the cut surface can be made neatly, and the product value can be increased. In addition, since the middle part of the cam is almost linear, there is no risk of stripes forming on the cut surface, and the effective cutting area is longer than when the cam is simply arc-shaped, resulting in high cutting efficiency. There are advantages that can be obtained. In addition, there are fewer chips and the best sharpness is maintained for a long time, so there is no need to frequently sharpen the cutting blade, and cutting work can be carried out efficiently.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view of a bread cutting device according to the present invention, Fig. 2 is a plan view, Fig. 3 is a sectional view showing the attachment state of the cutting blade, and Fig. 4 is a guide for the tool rest and balance stand. A sectional view showing the structure, Fig. 5 is a front view showing the relationship between the cam and the cam follower, Fig. 6 is a sectional view showing how the turret and balance stand are connected to the joint, and Fig. 7 is the relationship between the crankshaft and gears, etc. FIG. 8 is a schematic view of the balance mechanism, and FIG. 9 is a front view showing another embodiment of the cam follower. 1... Cutting blade, 3... Drive device, 4... Cam,
4a, 4b...Guide surface, 16...Cam follower mechanism, 18...Frame, A...End portion, B...Intermediate portion, W...Object to be cut.

Claims (1)

[Claims] 1. In a reciprocating cutting device that cuts an object to be cut, such as bread, by reciprocating the cutting blade in the longitudinal direction relative to the frame by a drive device, either the frame or the cutting blade has both ends with a small radius of curvature. A plurality of convex cams each having a middle part with a large radius of curvature between the parts are provided with the middle part protruding in the direction of the cutting edge of the cutting blade. A reciprocating cutting device characterized in that a plurality of cam follower mechanisms are provided corresponding to the cams, respectively, for causing the cutting blade to reciprocate convexly in the direction of the cutting edge while being guided by two guide surfaces.