CA1210264A - Automatic key cutting machine - Google Patents
Automatic key cutting machineInfo
- Publication number
- CA1210264A CA1210264A CA000441928A CA441928A CA1210264A CA 1210264 A CA1210264 A CA 1210264A CA 000441928 A CA000441928 A CA 000441928A CA 441928 A CA441928 A CA 441928A CA 1210264 A CA1210264 A CA 1210264A
- Authority
- CA
- Canada
- Prior art keywords
- key
- carriage
- cutting machine
- rotary
- conversion means
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Milling Processes (AREA)
Abstract
ABSTRACT
An automatic key cutting machine having a key carriage can be pivotably moved by means of a torsion spring, and can be moved leftward and rightward along a guide rod by means of a reversible motor as well as a pair of microswitches in order to effect the key cutting automatically. A snap lock is provided on the key carriage for enabling the latter to be locked in such a position that the key blank is moved away from the milling cutter for the conveni-ance of releasing the key sample or securing the key blank on the key carriage.
An automatic key cutting machine having a key carriage can be pivotably moved by means of a torsion spring, and can be moved leftward and rightward along a guide rod by means of a reversible motor as well as a pair of microswitches in order to effect the key cutting automatically. A snap lock is provided on the key carriage for enabling the latter to be locked in such a position that the key blank is moved away from the milling cutter for the conveni-ance of releasing the key sample or securing the key blank on the key carriage.
Description
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The present invention relates to a key cutting machine, and more particularly to an improved atuomatic key cut-ting machine having a key carriage that can be pivotably moved by means of a torsion spring, and can be moved leftward and rightward along a guide rod by means of a reversible motor as well as a pair of microswitches in order to effect the key cut-ting automatically.
In a conventional automatic key cutting machine, the milling cutter and key carriage are driven by the same motor, hence cams should be used For obtaining reciprocal movement of the key carriage. However, the use of cams can only urge the key carriage to move forward for effecting the key cu-tting, and cannot urge the same to return to its original position. For effecting the next key cutting, it is necessary to have the key carriage pivotably moved by hand to such a degree that the key blank is moved away from the milling cutter and thus the key carriage can be moved back to its original position. This will decrease the cutting speed and its accuracy. Furthermore, it is impossible for the key carriage to change its moving direction and to make a stop during its moving period due to the use of cams.
The present invention provides an improved automatic key cutting machine comprising two motors, in which one of the motors is used for driving a milling cutter to ro-tate while the other motor is a reversible motor and used for driving key carriage which is moved leftward and rightward in conjunction with a pair of microswitches. The key carriage can make a stop during its moving period by means of a double pole, single throw switch.
According to the present invention there is provided an automatic key cutting machine comprising: a motor for rota-tably driving a milling cutter; a key carriage for holding a key sample to be copied and a key blank to be machined into the form ~tl~
A
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of a sample by the milliny cutter; a guide structure alony ~/hich the key carriage is lineraly movable; bias means for biasing th~
key carriage into a working position in which a key sample carried thereby is engaged by a guide secured on a frame of the 5 machine, and in which a key blank carried by the carriage is engaged by said milling cutter; a reversible rotary motor;
rotary-to-linear motion conversion means arranged to convert rotation of an output shaft of the reversible motor into linear movement, the key carriage being coupled to said conversion rneans such that operation of the reversible motor causes the key carriage to move along the guide structure in a direction dependent on the sense of rotation of said output shaft; and a limit arrangement means for automatically de-energizing said reversible motor to stop the key carriage when the cutting of a key blank is complete, said limit arrangement means including a pair of spaced switches connected into the energization circuit of the reversible motor and a switch-operating member linearly reciprocable movable by said conversion means between said switches whereby to operate the latter at respective predeter-20 mined lirnit positions of the carriage along its guide structure.
Thus according to the present invention the auto-matic key cutting machine comprises a motor arranged in con-junction with a toggle switch for driving a milling cutter to 25 rotate. A torsion spring arranged between a guide rod and a key carriage for biasing a key sample secured on the key carriage against a guide secured on a frame, and biasing a key blank secured on the key carriage against the milling cutter for cutting the key blank. In addition, the following members are provided; a lead screw slidably engaged with the guide rod; a reversible motor for driving the key carriage to move leftward and rightward; a small lead screw; a nut engaged with the small lead screw and having a protrusion protruding between a pair of microswitches for butting against the latter in order to enable the key carriage to make a stop when cutting of the key blank is completed; and a snap lock for locking the key carriage in such
The present invention relates to a key cutting machine, and more particularly to an improved atuomatic key cut-ting machine having a key carriage that can be pivotably moved by means of a torsion spring, and can be moved leftward and rightward along a guide rod by means of a reversible motor as well as a pair of microswitches in order to effect the key cut-ting automatically.
In a conventional automatic key cutting machine, the milling cutter and key carriage are driven by the same motor, hence cams should be used For obtaining reciprocal movement of the key carriage. However, the use of cams can only urge the key carriage to move forward for effecting the key cu-tting, and cannot urge the same to return to its original position. For effecting the next key cutting, it is necessary to have the key carriage pivotably moved by hand to such a degree that the key blank is moved away from the milling cutter and thus the key carriage can be moved back to its original position. This will decrease the cutting speed and its accuracy. Furthermore, it is impossible for the key carriage to change its moving direction and to make a stop during its moving period due to the use of cams.
The present invention provides an improved automatic key cutting machine comprising two motors, in which one of the motors is used for driving a milling cutter to ro-tate while the other motor is a reversible motor and used for driving key carriage which is moved leftward and rightward in conjunction with a pair of microswitches. The key carriage can make a stop during its moving period by means of a double pole, single throw switch.
According to the present invention there is provided an automatic key cutting machine comprising: a motor for rota-tably driving a milling cutter; a key carriage for holding a key sample to be copied and a key blank to be machined into the form ~tl~
A
~()Z6~L
of a sample by the milliny cutter; a guide structure alony ~/hich the key carriage is lineraly movable; bias means for biasing th~
key carriage into a working position in which a key sample carried thereby is engaged by a guide secured on a frame of the 5 machine, and in which a key blank carried by the carriage is engaged by said milling cutter; a reversible rotary motor;
rotary-to-linear motion conversion means arranged to convert rotation of an output shaft of the reversible motor into linear movement, the key carriage being coupled to said conversion rneans such that operation of the reversible motor causes the key carriage to move along the guide structure in a direction dependent on the sense of rotation of said output shaft; and a limit arrangement means for automatically de-energizing said reversible motor to stop the key carriage when the cutting of a key blank is complete, said limit arrangement means including a pair of spaced switches connected into the energization circuit of the reversible motor and a switch-operating member linearly reciprocable movable by said conversion means between said switches whereby to operate the latter at respective predeter-20 mined lirnit positions of the carriage along its guide structure.
Thus according to the present invention the auto-matic key cutting machine comprises a motor arranged in con-junction with a toggle switch for driving a milling cutter to 25 rotate. A torsion spring arranged between a guide rod and a key carriage for biasing a key sample secured on the key carriage against a guide secured on a frame, and biasing a key blank secured on the key carriage against the milling cutter for cutting the key blank. In addition, the following members are provided; a lead screw slidably engaged with the guide rod; a reversible motor for driving the key carriage to move leftward and rightward; a small lead screw; a nut engaged with the small lead screw and having a protrusion protruding between a pair of microswitches for butting against the latter in order to enable the key carriage to make a stop when cutting of the key blank is completed; and a snap lock for locking the key carriage in such
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a position that the key blank is moved away from the milling cutter for the convenience of releasing the key sample or securing a key blank on the key carr1age.
In one embodiment of the present invention said rotary-to-linear motion conversion means comprise respec-tive rotary-to-linear action conversion members for driving the key carriage and for driving the switch-operating member. Suitably said rotary-to-linear motion conversion means comprise a common rotary-to-linear motion conversion member for driving both the key carriage and the switch-operating member. Preferably the conversion means includes an output member linearly slidable along said guide structure and mounting the key carriage, the guide structure being in the form of a guide rod extending through an aperture in said output member and the key carriage being pivotal about the axis of the guide rod into its working position under the action of said bias means. Desirably said output member is a lead screw serving as a rack gear~ the lead screw being engaged by a pinion of the conversion means and having an axial aperture through which said guide rod passes.
More preferably the switch-operating member is provided with a pair of adjustable screws on opposite sides thereof for engaging respective ones of the said switches.
An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings, in which:-Figure l is a pictorial view of an embodiment of an automatic key cutting machine in accordance with the presentinvention;
Figure 2 is a top view oF the automatic key cutting machine of Figure l;
Figure 3 is a side view of the automatic key cutting 2a -)2~i~
machine of Figure l;
Figure 4 is a sectional view of a snap lock in accor-dance with the present invention; and Figure 5 shows one possible embodiment of the circuit of the present invention.
Referring now to Fig.s 1 to 4, the automatic key cut-ting machine of this invention includes a motor Ml secured on abase 5 for driving a pair of milling cutters 3 and 4 secured on an axis 2 rotatably secured on the base 5. A reversible motor A 2b -12~C~;26~
is also secured on the base 5 for driving a key carriage 6 to move leftward and rightward. A nut 10 is engaged with a small leader 9 rotatably secured on the base 5, and hav-ing a protrusion protruding between a pair of microswitches 15 and 16 for butting against the latter in order to cut off a circuit of the reversible motor M2, and urge the key carr-iage 6 to be stopped. The protrusion is also provided with a pair of regula-ting screws 14 at left and right sides there-of for serving as a punch rod for respectively butting against 10 microswitches 15 and 16. The nut 10 is fur-ther provided with an elonga-ted slot 11 for engagement with a rail 12 secured on the base in order to urge nut 10 to move leftward or right-ward along rail 12 when small lead screw 9 rotates in a clockwise or counter-clockwise direction.
The small lead screw 9 is driven by the reversible motor M2 by means of a bel-t gear 18 as well as a belt 5. A
bevel gear 17 is secured at one end of the small lead screw 9, and meshed with a bevel gear 17' secured on an axis 19 in order that the latter can be driven by the reversible motor M2. A worm gear 20 is secured on the axis 19, and meshed with a lead screw 7 for driving the lat-ter leftward or right-ward. The lead screw 7 is in a form of a worm, and slidably engaged with a guide rod 8. A key carriage 6 is secured on the lead screw 7 in order that the former can be moved together with the latter. A torsion spring 21 is arranged between the guide rod 8 and key carriage 6 for biasing a key sample (not shown) secured on the left end side of the key carriage 6 against a guide 22 secured on the base 5, and for biasing a key blank 23 secured on the right end key carriage 6 against the milling cutter 3 in order to urge the milling cutter to cut the key blank 23 for duplicating a key to be the same as the key sample (not shown) when the key carriage 6 is moved leftward and the key sample is moved along -the guide 22.
Referring now to Flg.s 3 and 4, the leader 7 and 12~6g~
guide rod 8 are respectively provided with an elongated slot (71,81) arranged in alignment one with the other for receiving a snap lock 24 in order to enable the key earriage 6 to be angularly moved and locked in a position away from the eutter guide for -the convenienee of releasing or seeuring the key sample and a key blank on the key earriage.
Now please turn to Fig. 5, when the toggle switch L is in its left side "ON" posi-tion, the movable plate will be moved to contacts B and D to form a circuit including motor Ml for driving the rnilling eutters 3 and 4 to rotate, and a circuit including the reversible motor M2 for driving key carriage 6 to move leftward for cutting a key blank, and driving nut 11 to move leftward. The circuit including the reversible motor M2 will be broken, and motors Ml and M2 will be stopped when the regulating serew 14 butted against miero-switeh 15. On the eontrary, when the toggle switch L is in its right side "ON" position, the movable plate will be moved to contacts A and C to form a eireuit ineluding Ml for driving the milling eutters 3 and 4 to ro-tate, and a eircuit including reversible motor M2 for driving key carriage 6 to move right-ward for cutting key blank, and driving nu-t 11 to move right-ward. The eireuit including the reversible motor M2 will be broken, and motors M1 and M2 will be stopped when the regulat-ing screw 14 abuts against the mieroswiteh 16. Obviously, the key earriage ean be moved leftward and rightward without moving the same away from milling eutter.
The above said eireuits may inelude a double pole, single throw switeh P for urging reversible motor M2 to be stopped when switeh P is opened, and motor Ml keeps rotating.
a position that the key blank is moved away from the milling cutter for the convenience of releasing the key sample or securing a key blank on the key carr1age.
In one embodiment of the present invention said rotary-to-linear motion conversion means comprise respec-tive rotary-to-linear action conversion members for driving the key carriage and for driving the switch-operating member. Suitably said rotary-to-linear motion conversion means comprise a common rotary-to-linear motion conversion member for driving both the key carriage and the switch-operating member. Preferably the conversion means includes an output member linearly slidable along said guide structure and mounting the key carriage, the guide structure being in the form of a guide rod extending through an aperture in said output member and the key carriage being pivotal about the axis of the guide rod into its working position under the action of said bias means. Desirably said output member is a lead screw serving as a rack gear~ the lead screw being engaged by a pinion of the conversion means and having an axial aperture through which said guide rod passes.
More preferably the switch-operating member is provided with a pair of adjustable screws on opposite sides thereof for engaging respective ones of the said switches.
An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings, in which:-Figure l is a pictorial view of an embodiment of an automatic key cutting machine in accordance with the presentinvention;
Figure 2 is a top view oF the automatic key cutting machine of Figure l;
Figure 3 is a side view of the automatic key cutting 2a -)2~i~
machine of Figure l;
Figure 4 is a sectional view of a snap lock in accor-dance with the present invention; and Figure 5 shows one possible embodiment of the circuit of the present invention.
Referring now to Fig.s 1 to 4, the automatic key cut-ting machine of this invention includes a motor Ml secured on abase 5 for driving a pair of milling cutters 3 and 4 secured on an axis 2 rotatably secured on the base 5. A reversible motor A 2b -12~C~;26~
is also secured on the base 5 for driving a key carriage 6 to move leftward and rightward. A nut 10 is engaged with a small leader 9 rotatably secured on the base 5, and hav-ing a protrusion protruding between a pair of microswitches 15 and 16 for butting against the latter in order to cut off a circuit of the reversible motor M2, and urge the key carr-iage 6 to be stopped. The protrusion is also provided with a pair of regula-ting screws 14 at left and right sides there-of for serving as a punch rod for respectively butting against 10 microswitches 15 and 16. The nut 10 is fur-ther provided with an elonga-ted slot 11 for engagement with a rail 12 secured on the base in order to urge nut 10 to move leftward or right-ward along rail 12 when small lead screw 9 rotates in a clockwise or counter-clockwise direction.
The small lead screw 9 is driven by the reversible motor M2 by means of a bel-t gear 18 as well as a belt 5. A
bevel gear 17 is secured at one end of the small lead screw 9, and meshed with a bevel gear 17' secured on an axis 19 in order that the latter can be driven by the reversible motor M2. A worm gear 20 is secured on the axis 19, and meshed with a lead screw 7 for driving the lat-ter leftward or right-ward. The lead screw 7 is in a form of a worm, and slidably engaged with a guide rod 8. A key carriage 6 is secured on the lead screw 7 in order that the former can be moved together with the latter. A torsion spring 21 is arranged between the guide rod 8 and key carriage 6 for biasing a key sample (not shown) secured on the left end side of the key carriage 6 against a guide 22 secured on the base 5, and for biasing a key blank 23 secured on the right end key carriage 6 against the milling cutter 3 in order to urge the milling cutter to cut the key blank 23 for duplicating a key to be the same as the key sample (not shown) when the key carriage 6 is moved leftward and the key sample is moved along -the guide 22.
Referring now to Flg.s 3 and 4, the leader 7 and 12~6g~
guide rod 8 are respectively provided with an elongated slot (71,81) arranged in alignment one with the other for receiving a snap lock 24 in order to enable the key earriage 6 to be angularly moved and locked in a position away from the eutter guide for -the convenienee of releasing or seeuring the key sample and a key blank on the key earriage.
Now please turn to Fig. 5, when the toggle switch L is in its left side "ON" posi-tion, the movable plate will be moved to contacts B and D to form a circuit including motor Ml for driving the rnilling eutters 3 and 4 to rotate, and a circuit including the reversible motor M2 for driving key carriage 6 to move leftward for cutting a key blank, and driving nut 11 to move leftward. The circuit including the reversible motor M2 will be broken, and motors Ml and M2 will be stopped when the regulating serew 14 butted against miero-switeh 15. On the eontrary, when the toggle switch L is in its right side "ON" position, the movable plate will be moved to contacts A and C to form a eireuit ineluding Ml for driving the milling eutters 3 and 4 to ro-tate, and a eircuit including reversible motor M2 for driving key carriage 6 to move right-ward for cutting key blank, and driving nu-t 11 to move right-ward. The eireuit including the reversible motor M2 will be broken, and motors M1 and M2 will be stopped when the regulat-ing screw 14 abuts against the mieroswiteh 16. Obviously, the key earriage ean be moved leftward and rightward without moving the same away from milling eutter.
The above said eireuits may inelude a double pole, single throw switeh P for urging reversible motor M2 to be stopped when switeh P is opened, and motor Ml keeps rotating.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An automatic key cutting machine comprising: a motor for rotatably driving a milling cutter; a key carriage for holding a key sample to be copied and a key blank to be machined into the form of the sample by the milling cutter; a guide structure along which the key carriage is linearly movable; bias means for biasing the key carriage into a working position in which a key sample carried thereby is engaged by a guide secured on a frame of the machine, and in which a key blank carried by the carriage is engaged by said milling cutter; a reversible rotary motor; rotary-to-linear motion conversion means arranged to convert rotation of an output shaft of the reversible motor into linear movement, the key carriage being coupled to said conversion means such that operation of the reversible motor causes the key carriage to move along the guide structure in a direction dependent on the sense of rotation of said output shaft; and a limit arrangement means for automatically de-energizing said reversible motor to stop the key carriage when the cutting of a key blank is complete, said limit arrangement means including a pair of spaced switches connected into the energization circuit of the reversible motor and a switch-operating member linearly reciprocable movable by said con-version means between said switches whereby to operate the latter at respective predetermined limit positions of the carriage along its guide structure.
2. A key cutting machine according to claim 1, wherein said rotary-to-linear motion conversion means comprise respective rotary-to-linear action conversion members for driv-ing the key carriage and for driving the switch-operating member.
3. A key cutting machine according to claim 1, wherein said rotary-to-linear motion conversion means comprise a common rotary-to-linear motion conversion member for driving both the key carriage and the switch-operating member.
4. A key cutting machine according to claim 1, where-in the conversion means includes an output member linearly slidable along said guide structure and mounting the key car-riage, the guide structure being in the form of a guide rod ex-tending through an aperture in said output member and the key carriage being pivotal about the axis of the guide rod into its working position under the action of said bias means.
5. A key cutting machine according to claim 4, where-in said output member is a lead screw serving as a rack gear, the lead screw being engaged by a pinion of the conversion means and having an axial aperture through which said guide rod passes.
6. A key cutting machine according to claim 1, where-in the switch-operating member is provided with a pair of adjus-table screws on opposite sides thereof for engaging respective ones of the said switches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000441928A CA1210264A (en) | 1983-11-25 | 1983-11-25 | Automatic key cutting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000441928A CA1210264A (en) | 1983-11-25 | 1983-11-25 | Automatic key cutting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1210264A true CA1210264A (en) | 1986-08-26 |
Family
ID=4126596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000441928A Expired CA1210264A (en) | 1983-11-25 | 1983-11-25 | Automatic key cutting machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1210264A (en) |
-
1983
- 1983-11-25 CA CA000441928A patent/CA1210264A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |