JPS6140367B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing bones from a carcass of a bird or beast for meat, and particularly to a deboning method suitable for removing long bones from a divided carcass. .

For example, the deboning process of splitting a chicken leg at the thigh joint and cutting off the tip from the keizume was done by hand, making cuts with a knife and peeling it off by hand. In the case of livestock carcasses, it is also used to separate the meat from the bones by wrapping strong, thick thread around the bones and pulling it so that it slides along the bones. Since such deboning work requires a great deal of labor, various attempts have been made to reduce the labor and improve work efficiency, such as by using powered blades, but due to the special technical conditions of deboning work, The bones to be worked on are not geometrically shaped, especially in the joints, which are lump-like and intricately connected to the upper ligaments and cartilage, which poses the following technical difficulties.
That is, (a) When deboning is performed using a sharp, rigid power cutter, there is a risk that part of the bone will be scraped off by the cutter, and bone fragments may be mixed into the meat.

(b) In order to avoid the above-mentioned problems, the power cutter must be operated with care by the operator. If an automatic control device were to handle this adjustment, it would be rather uneconomical because the automatic control device would have to be equipped with a complicated and expensive feedback function.

(c) Even when a strong, thick thread or a linear material such as piano wire is wrapped around the bone to separate the meat from the bone, the worker must be careful. The reason for this will be explained below with reference to FIG.

This figure is a schematic illustration of the joints of a carcass. Two bones 1a and 1b face each other at a joint 2 and are connected by a ligament 3. 4 is the muscle and fat layer (hereinafter referred to as meat) covering this part.

Wrap the piano wire 5 around the bone 1a above and arrow A
When strongly pulled in the direction, the piano wire 5 slides along the surface of the bone 1a as shown by arrow B, and peels off the meat 4 from the bone 1a.

However, if the tension in the direction of arrow A is not relaxed when the piano wire 5 approaches the joint 2, the piano wire 5 will tear the ligament 3 as shown by the arrow C and enter the joint 2, causing the bone 1a Since the bone 1b is separated from the bone 1b, the deboning work cannot be carried out smoothly.

In order to prevent such troubles, if the tensile force A is manually manipulated by a worker, the number of man-hours required for this deboning work will increase, and automation and unmanned work will be hindered. Furthermore, if it is attempted to have an automatic control device perform the above-mentioned adjustments, the automatic control device must be constructed with a complicated and expensive feedback function, which is uneconomical.

The present invention was made in view of the above circumstances, and
A deboning method that is suitable for being carried out by an automatic mechanical device, does not require large amounts of power, and can easily remove bones from a carcass without requiring an automatic control device with a complicated feedback function. The purpose is to provide

In order to achieve the above object, the bone removal method of the present invention involves wrapping a belt-like flexible cutter around the bone at a substantially right angle, moving the belt-like cutter circumferentially along the surface of the bone, The cutter is also characterized in that, along with the circumferential movement, the cutter is moved in the longitudinal direction of the bone at a slower speed than the circumferential movement.

FIG. 2 is an explanatory diagram of the principle of the method of the present invention,
6 in the figure is a belt-shaped flexible cutter used in the method of the present invention. When carrying out the method of the present invention, the belt-shaped cutter 6 can be selected from various materials as described below, but in short, it is made of a flexible and strong material and has a width W larger than a thickness T. using an elongated member having a

The belt-shaped cutter 6 is wound around the bone 1a in a direction substantially perpendicular to the bone 1a, and the belt-shaped cutter 6 is moved in the circumferential direction (arrow R) along the surface of the bone 1a. In this case, the movement of the belt-shaped cutter 6 may be in a fixed direction as shown by the arrows E and E' in the figure.
It may also be in a reciprocating direction as shown by arrows F, F', G, and G' in the figure.

When the belt-shaped cutter 6 is moved in this way, it acts to make a cut between the bone and the meat, rather than the action of handling and peeling off the bone like the filament (for example, the piano wire 5) in the prior art. For this reason,
By sliding the belt-shaped cutter 6 in the longitudinal direction of the bone as shown by arrow B at a speed lower than the circumferential movement described above, the bone 1a and the meat etc. 4 can be separated with a relatively small force. .

When the belt-shaped cutter 6 approaches the joint 2, since the belt-shaped cutter 6 has a width W, it does not cut into the space between the bones 1a and 1b, as indicated by the arrow D. The bone is removed along the envelope of the bone, and the ligament 3 is removed from the bones 1a and 1b.
The meat 4 is separated from the bones 1a, 1b while remaining attached to the bones 1a, 1b.

According to the method of the present invention, the belt-shaped cutter 6 can be guided by the bones 1a and 1b and moved in the length direction thereof, so that the cutter 6 can be easily and efficiently moved without providing an automatic control device with a complicated feedback function. It can be deboned.

3 and 4 are perspective views of belt-shaped cutters 6' and 6'', respectively, constructed for carrying out the method of the present invention.

The belt-shaped cutter 6' illustrated in FIG. 3 is formed into an annular shape using hard polyurethane. The belt-shaped cutter 6' formed in an annular shape is conveniently wound around the drive pulley 7 and driven. 7a is a sprocket-like projection provided on the pulley 7, and 6a' is a hole provided in the belt-like cutter 6' so as to engage with the above-mentioned projection 7a. One edge 6'b of the belt-shaped cutter 6' is formed into an acute angle to form a blade. If the belt-shaped cutlet is made of a material that is softer than bone and harder than meat, such as hard polyurethane in this example, there is no risk of cutting into the bone and scraping off bone fragments, and moreover, it has good sharpness when separating the meat 4. is obtained. If the edge 6b' with the above-mentioned blade is formed with concavities and convexities 6c' as shown in the figure, the sharpness will be better.

The belt-shaped cutter 6'' illustrated in FIG. 4 is formed using a thin steel strip, and is configured to be gripped at both ends H and I and driven back and forth as shown by arrows E and E'. When a belt-shaped cutter is made of a material harder than bone, if the blade provided on the edge 6b'' is appropriately rounded to suppress sharpness, it is possible to remove bone without scraping off bone fragments.

FIG. 5 is an explanatory diagram of the unevenness provided on the belt-shaped cutters 6' and 6''.These unevenness may be formed in a rectangular shape as shown in FIG. 5J, or in a sawtooth shape as shown in FIG. It may be formed in a triangular wave shape as shown in the figure L, or in a continuous arc shape as shown in the figure M.Also, it may be formed straight without any unevenness as shown in the figure N. It's okay.

As described in detail above, the present invention wraps a belt-like flexible cutter around a bone at a substantially right angle, moves the belt-like cutter in the circumferential direction along the surface of the bone, and By moving the cutter in the longitudinal direction of the bone at a slower speed than the circumferential movement, large amounts of power are not required, and an automatic control device with a complicated feedback function is not required. , the bone can be easily removed from the carcass, and it greatly contributes to the automation and unmanned deboning equipment.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional deboning method, and FIG. 2 is an explanatory diagram of the principle of the deboning method of the present invention. 3 and 4 are respectively a perspective view of an example of a belt-shaped cutter constructed for carrying out the method of the present invention, and FIG.
The figure is an explanatory view of the unevenness provided on the belt-shaped cutter. 1a, 1b...Bone, 2...Joint, 3...Ligament,
4...meat, 5...piano wire, 6,6',6''...
Belt-shaped cutter, 6a'... hole, 6b', 6b''...
Edge, 6c', 6c''... Unevenness, 7... Drive pulley, 7
a... Sprocket-shaped protrusion.

Claims (1)

[Claims] 1. In a method for removing bone bones from a carcass, a belt-shaped flexible cutter is wound around the bone at a nearly right angle, the belt-shaped cutter is moved circumferentially along the surface of the bone, and the above-mentioned A method for deboning a carcass, comprising moving the cutter in the longitudinal direction of the bone at a slower speed than the circumferential movement.