GB2132928A - An adjustable nip mechanism - Google Patents
An adjustable nip mechanism Download PDFInfo
- Publication number
- GB2132928A GB2132928A GB08232485A GB8232485A GB2132928A GB 2132928 A GB2132928 A GB 2132928A GB 08232485 A GB08232485 A GB 08232485A GB 8232485 A GB8232485 A GB 8232485A GB 2132928 A GB2132928 A GB 2132928A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nip
- adjustable
- working
- gap
- members
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/38—Cutting-out; Stamping-out
- B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
- B26F1/42—Cutting-out; Stamping-out using a press, e.g. of the ram type having a pressure roller
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Scissors And Nippers (AREA)
Abstract
An adjustable nip mechanism for a die cutting machine comprises upper and lower rollers 1,2 which define an adjustable nip therebetween. One roller 1 may be depressed against the force of compression springs 7. On depression, gaps are opened up into which inserts (19, Figure 3) may be inserted to provide a solid reaction support and maintain the roller in the depressed position for a die cutting operation. This facilitates the operation of the machine in permitting passage of workpieces in a cutting stroke through the nip and return passage of the workpiece in a non cutting stroke. <IMAGE>
Description
SPECIFICATION
An adjustable nip mechanism
The present invention relates to an adjustable nip mechanism intended particularly, but not exclusively, for a die cutting machine in which a blank to be cut is sent between members defining a nip in one direction in a first, working, pass and returned between the members after increasing the nip dimension in a second pass.
Mechanisms of this general type are known, but have tended in the past to be heavy and bulky in construction in order to provide a firm reaction base for the adjustable nip member when the nip members are in a working position. Such mechanisms are expensive to produce and house and difficult to install. Their operation may also impose undue working stresses on the fabric of a building in which they are housed.
According to the present invention, there is provided an adjustable nip mechanism comprising two nip members defining the nip at least one member of which is adjustable between a first position in which the members define a working nip gap and a second position in which the members define a nip gap larger than the working nip gap, means for moving the said one member between the first and second positions, and means for preventing movement of the said one member from the first position in a direction to enlarge the working nip gap.
A preferred embodiment of the invention may include any one or more of the following advantageous features:
(a) The said one nip member is resiliently mounted and the means for moving comprises means for urging the said one nip member against the force of the resilient mounting,
(b) The means for urging comprises a pressure fluid actuatable piston and cylinder device,
(c) The resilient mounting comprises a pair of slides in which opposite axial ends respectively of the said one nip member are mounted and which are respectively supported on compression springs tending to urge the said one nip member away from the other nip member.
(d) The means for preventing movement of the said one member comprises movable spports disposed at opposite axial ends of the member providing a solid connection between the respective end of the member and the frame of the mechanism preventing movement of the said one nip member away from the other nip member.
(e) The movable supports of (d) are disposed for insertion between the slides of the (c) and the respective parts of the frame in order to hold the said one nip member in a working position against the force of the compression springs.
(f) Means are provided for inserting the movable supports.
(g) The means for inserting comprises pressure fluid operable piston and cylinder devices.
(h) Means are provided for pasing workpieces in a first working direction through the nip and in a second non-working direction opposite to the first working direction through the nip.
(i) Control means are provided for controlling the adjustment of the members in order to adjust the gap in synchronism with the means for passing workpieces and in accordance with a predetermined sequence such that the means for passing are operative to feed forward in the working direction after adjustment of the nip to its working gap and to reverse direction and return after adjustment of the nip to a gap larger than the working gap.
(j) Drive means tor the the nip members comprises an electric motor through pulleys and belts and means are provided for maintaining the tension of the belt driving the adjustable member irrespective of the position of that member.
The invention also includes any machine incorporating a nip mechanism as defined above such as a die cutting machine.
In order that the invention may be more clearly understood, one embodiment thereof will now be described, by way of example, with reference to the accompanying drawing, in which:
Figure 1 is a perspective partial view of the nip mechanism for a die cutting machine,
Figure 2 is an end elevational view of the upper of the rollers of the nip mechanism of Figure 1,
Figure 3 is a detailed perspective view of a wedge insertion device forming part of the mechanism of
Figure 1,
Figure 4 is a perspective view of a drive arrangement for the rollers of the nip mechanism of Figure 1,
Figure 5 shows a side elevational view in section of the support at one end of the upper of the rollers of the nip mechanism of Figure 1,
Figure 6 diag rammatically shows a pneumatici electric control circuit for the nip mechanism of
Figure 1, and
Figure 7 diagrammatically shows the disposition of switches forming part of the circuit of Figure 6 relative to the nip.
Referring to Figure 1,the nip mechanism comprises upper and lower rollers 1 and 2 mounted in respective self-aligning and self-lubricating bearings. The bearings at opposite ends respectively of the lower roller 1 are fixed in a fabricated frame 3 of the mechanism and the bearing at opposite ends respectively of the upper roller 2 (which are of the cartridge type) are fixed in slides 4 in the frame 3.
The slides 4 at one end of the upper roller 1 are shown in Figure 2 as are also the bearings 5 at that end of the upper roller 1. These bearings 5 are mounted at each end of the roller in respective blocks 6 which slide in respective slides 4. The blocks - 6 are supported on compression springs 7. A safety micro-switch is disposed beneath the roller 1 for a purpose to be described later. Two further microswitches and a photocell referenced A, B and C respectively in Figure 6 are provided to control operation of the mechanism also in a manner to be described later. Each block 6 abutts at its upper end a further block 8 which incorporates a thrust bearing 9.
This bearing 9 may be adjusted by means of an adjusting screw 10 in order to adjust the cutting pressure of the die cutting machine. The adjusting screw 10 extends through a block 11 which is connected by screws 12to the frame 3.
A space is defined between each pair of blocks 6 and 8 at opposite ends respectively of the upper roller 1. In the position shown in the dimension of the space is a minimum the upper roller 1 being urged into its uppermost position by the compression springs 7. The dimension of the nip is at a maximum for the given adjusted position of the block 8. In order to adjust the dimension of the nip to a working nip dimension, the roller 1 is depressed against the force of the compression springs 7 to open up gaps between the blocks 6 and corresponding blocks 8. Depression of the roller 1 is effected by means of two spaced levers 14 (only one is shown) pivotally connected at 15 to a longitudinal member of the frame 3.Each lever carries a nylon covered roller 16 which bears on the surface of the roller 1 and is connected to a pneumatic piston and cylinder device 17 at its end remote from the connection 15.
The connection of the device 17 to the lever 14 is pivotal and the device is supported on an adjustable support 18 which is connected to a longitudinal member of the frame 3. A fail safe sliding return arm 14a is also connected to the lever 14 in case the springs 7 break.
To maintain the roller in the depressed position and to provide a solid reaction support for the roller during a working pass of the mechanism with the nip set at its working gap an insert is introduced into each gap before the air pressure is released from the devices 17. One of these two inserts is shown in
Figure 3. It comprises a solid block of metal 19 housed in a metal housing 20 which is connected to a pneumatic piston and cylinder device 21. The front face 22 of the housing comprises a mounting plate which is connected to the corresponding plate 8. Six spring loaded adjusting screws 23 extend through the top of the housing. Above the block 19 within the housing 20 is disposed a shim plate 24. A taper pin 28 is disposed between the top of each block 8 and the frame.The insert and corresponding block 8 are connected to move up and down together so that different heights of nip can be catered for. A safety clearance is provided between the top of each recess into which the corresponding metal block 19 is to be inserted and the top of the block 19 itself so that the block 19 does not strike the corresponding block 8 on insertion. When a block 19 is in the inserted position and is trapped between the corresponding block 8 and slide 4, the corresponding bearing, springs, shim plate and block are compressed to give a solid and rigid cutting nip.
Bottom roller 2 is driven by a main direct coupling drive to which power is provided by means of a motor with belt drive and gearbox (not shown). The upper roller 1 is driven from the bottom roller 2 by means of the belt drive and gearing shown in Figure 4. This comprises a belt 30 driven by the motor and driving a pulley 31. Pulley 31 is connected through gearing comprising two equally sized gear wheels 32,33 mounted in a frame 34 to a further pulley 35. A belt 36 extends around pulley 35 and around a further pulley (not shown) connected to the upper roller 1 to transmit drive to the upper roller 1.A spring loaded planet pinion automatically maintains the working tension in the belt 36 when the position of the upper roller is altered in order to alter the nip gap and as the external diameter of the cutting matrix on the upper roller reduces due to wear thereby balancing the surface speeds of the upper and lower rollers. The pulleys 31 and 35 and the gearwheels 32 and 33 are mounted on the frame 34 through four fully adjustable self-lubricating selfaligning bearings 36.
The operation of the above described system will now be described with further reference to the electrolpneumatic circuit of Figure 6 and the diagram of Figure 7. When the motor driving rollers 1 and 2 is first switched on, air is autmatically supplied to devices 17 and 21. As a result, upper roller 1 is depressed by levers 14 through bearings 16 against the force of compression springs 7 and the metal blocks 19 of the inserts are inserted to prevent roller 1 rising beyond a predetermined cutting height.
Supply of air from a supply 39 to the cylinders of devices 17 and 21 is controlled by a pair of spring return solenoid valves 40 and 41. The nylon covering of the roller bearing 16 overcomes frictional resistance with the moving roller 1. These bearings 16 in fact bear against the end drive rings 1a of the roller 1 which also act as retaining rings for the cutting matrix on that roller 1. With the rollers 1 and 2 rotating in the working position defining a working nip gap (i.e. the metal blocks 19 in the inserted position between the blocks 6 and 8), a component to be cut or nipped is placed on a cutting form and both are fed by a conveyor to the nip in the direction of arrow F (see Figure 7) and carried through the nip by the rotation of the rollers so that the form cuts the component to a preset pattern.As the components form combination approaches the nip it activates microswitch A two exhaust devices 17 to permit inserted blocks 19 to be clamped. As the combination passes through the nip microswitch B is activated so that devices 17 remain exhausted or de-energised even after microswitch A is released by the combination. Further travel of the combination brings it over photocell C and releases microswitch
B. Release of microswitch B causes devices 17to be presurised and devices 21 to be exhausted thus in turn releasing the metal block 19 and withdrawing them. Photocell C maintains the devices 17 and 21 in this position. On return of the combination microswitch B is activated once again to exhaust devices 17 permitting roller 1 to adopt a clearance (i.e. non working) position for the return of the combination through the nip. In this direction of travel microswitch A takes over duty from microswitch B to maintain 17 and 21 exhausted. As travel of the component continues microswitch A is eventually released as a result of which devices 17 and 21 are repressurised ready for the cycle to be repeated.
Throughout the cycle the rollers 1 and 2 continue to rotate at the same speed and in the same direction. A safety micro-switch to be actuated by the upper roller 1 and wired into the circuit of the conveyor return feed is provided to prevent the conveyor from returning if the gap is still at its working dimension.
The dimensions of the mechanism may be varied as desired. In the particular example described above the pneumatic devices 17 are four inches in diameter with a one inch stroke and the pneumatic devices 21 are one inch in diameter with a threee inch stroke. The difference between the working and non-working nip gaps is 10mm.
It will be appreciated that the above embodiment has been described by way of example only and that many variations are possible without departing from the scope of the invention.
CLAIMS (filed on 14/11/83)
1. An adjustable nip mechanism comprising two nip members defining the nip at least one member of which is adjustable between a first position in which the members define a working nip gap and a second position in which the members define a nip gap larger than the working nip gap, means for moving the said one member between the first and second positions, and means for preventing movement of the said one member from the first position in a direction to enlarge the working nip gap.
2. An adjustable nip mechanism as claimed in claim 1, in which the said one nip member is resiliently mounted and the means for moving comprises means for urging the said one nip member against the force of the resilient mounting.
3. An adjustable nip mechanism as claimed in claim 1 or 2, in which the means for urging comprises a pressure fluid actuatable piston and cylinder device.
4. An adjustable nip mechanism as claimed in claim 2 or 3 when appendantto claim 2, in which the resilient mounting comprises a pair of slides in which opposite axial ends respectively of the said one nip member are mounted and which are respectively supported on compression springs tending to urge the said one nip member away from the other
nip member.
5. An adjustable nip mechanism as claimed in any preceding claim, in which the means for preventing movement of the said one member comprises movable supports disposed at opposite axial ends of the member providing a solid connection between the respective end of the member and the frame of the mechanism preventing movement of the said one nip member away from the other nip member.
6. An adjustable nip mechanism as claimed in
claim 5 when appendantto claim 3, in which the
movable supports are disposed for insertion be tween the slides of the mounting and the respective
parts of the frame in order to hold the said one nip
member in a working position against the force of the compression springs.
7. An adjustable nip mechanism as claimed in claim 5 or 6, in which means are provided for
inserting the movable supports.
8. An adjustable nip mechanism as claimed in
claim 7, in which the means for inserting comprises
pressure fluid operable piston and cylinder devices.
9. An adjustable nip mechanism as claimed in
any preceding claim, in which means are provided
for passing workpieces in a first working direction through the nip and in a second non-working direction opposite to the first working direction through the nip and in a second non-working direction opposite to the firt working direction through the nip.
10. An adjustable nip mechanism as claimed in claim 9, in which control means are provided for controlling the adjustment of the members in order to adjust the gap in synchronism with the means for passing workpieces and in accordance with a predetermined sequence such that the means for passing are operative to feed forward in the working direction after adjustment of the nip to its working gap and to reverse direction and return after adjustment of the nip to a gap larger than the working gap.
11. An adjustable nip mechanism as claimed in any preceding claim in which drive means for the nip members comprises an electric motor through pulleys and belts and means are provided for maintaining the tension of the belt driving the adjustable member irrespective of the position of the member.
12. An adjustable nip mechanism substantially as hereinbefore described with reference to the accompanying drawings.
13. A machine incorporating a nip mechanism as claimed in any preceding claim.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (13)
1. An adjustable nip mechanism comprising two nip members defining the nip at least one member of which is adjustable between a first position in which the members define a working nip gap and a second position in which the members define a nip gap larger than the working nip gap, means for moving the said one member between the first and second positions, and means for preventing movement of the said one member from the first position in a direction to enlarge the working nip gap.
2. An adjustable nip mechanism as claimed in claim 1, in which the said one nip member is resiliently mounted and the means for moving comprises means for urging the said one nip member against the force of the resilient mounting.
3. An adjustable nip mechanism as claimed in claim 1 or 2, in which the means for urging comprises a pressure fluid actuatable piston and cylinder device.
4. An adjustable nip mechanism as claimed in claim 2 or 3 when appendantto claim 2, in which the resilient mounting comprises a pair of slides in which opposite axial ends respectively of the said one nip member are mounted and which are respectively supported on compression springs tending to urge the said one nip member away from the other
nip member.
5. An adjustable nip mechanism as claimed in any preceding claim, in which the means for preventing movement of the said one member comprises movable supports disposed at opposite axial ends of the member providing a solid connection between the respective end of the member and the frame of the mechanism preventing movement of the said one nip member away from the other nip member.
6. An adjustable nip mechanism as claimed in
claim 5 when appendantto claim 3, in which the
movable supports are disposed for insertion be tween the slides of the mounting and the respective
parts of the frame in order to hold the said one nip
member in a working position against the force of the compression springs.
7. An adjustable nip mechanism as claimed in claim 5 or 6, in which means are provided for
inserting the movable supports.
8. An adjustable nip mechanism as claimed in
claim 7, in which the means for inserting comprises
pressure fluid operable piston and cylinder devices.
9. An adjustable nip mechanism as claimed in
any preceding claim, in which means are provided
for passing workpieces in a first working direction through the nip and in a second non-working direction opposite to the first working direction through the nip and in a second non-working direction opposite to the firt working direction through the nip.
10. An adjustable nip mechanism as claimed in claim 9, in which control means are provided for controlling the adjustment of the members in order to adjust the gap in synchronism with the means for passing workpieces and in accordance with a predetermined sequence such that the means for passing are operative to feed forward in the working direction after adjustment of the nip to its working gap and to reverse direction and return after adjustment of the nip to a gap larger than the working gap.
11. An adjustable nip mechanism as claimed in any preceding claim in which drive means for the nip members comprises an electric motor through pulleys and belts and means are provided for maintaining the tension of the belt driving the adjustable member irrespective of the position of the member.
12. An adjustable nip mechanism substantially as hereinbefore described with reference to the accompanying drawings.
13. A machine incorporating a nip mechanism as claimed in any preceding claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08232485A GB2132928B (en) | 1982-11-13 | 1982-11-13 | An adjustable nip mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08232485A GB2132928B (en) | 1982-11-13 | 1982-11-13 | An adjustable nip mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2132928A true GB2132928A (en) | 1984-07-18 |
| GB2132928B GB2132928B (en) | 1986-04-16 |
Family
ID=10534252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08232485A Expired GB2132928B (en) | 1982-11-13 | 1982-11-13 | An adjustable nip mechanism |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2132928B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2256163A (en) * | 1991-05-17 | 1992-12-02 | Focke & Co | Rotary die cutter. |
| CN103692486A (en) * | 2013-12-26 | 2014-04-02 | 苏州东福电子有限公司 | Adjustable die cutting machine |
| CN107738297A (en) * | 2017-11-15 | 2018-02-27 | 旺诠科技(昆山)有限公司 | A kind of compressed spring type division mechanism |
| CN109483645A (en) * | 2018-11-14 | 2019-03-19 | 安徽集友纸业包装有限公司 | Tipping paper die-cutting device |
-
1982
- 1982-11-13 GB GB08232485A patent/GB2132928B/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2256163A (en) * | 1991-05-17 | 1992-12-02 | Focke & Co | Rotary die cutter. |
| GB2256163B (en) * | 1991-05-17 | 1994-09-07 | Focke & Co | Apparatus for severing(collar)blanks from a web of material |
| CN103692486A (en) * | 2013-12-26 | 2014-04-02 | 苏州东福电子有限公司 | Adjustable die cutting machine |
| CN107738297A (en) * | 2017-11-15 | 2018-02-27 | 旺诠科技(昆山)有限公司 | A kind of compressed spring type division mechanism |
| CN107738297B (en) * | 2017-11-15 | 2023-10-13 | 旺诠科技(昆山)有限公司 | Pressure spring type dividing mechanism |
| CN109483645A (en) * | 2018-11-14 | 2019-03-19 | 安徽集友纸业包装有限公司 | Tipping paper die-cutting device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2132928B (en) | 1986-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3858432A (en) | Press structure | |
| US5072872A (en) | Device for transporting materials in strip, sheet, or filament form | |
| CA1135178A (en) | Cylinder operated swinging ram cutoff press | |
| US5775189A (en) | Cutting machine | |
| JPH0891696A (en) | Wire feeder | |
| US4765546A (en) | Jaw-type crushing apparatus | |
| KR930009401B1 (en) | Manipulator for forging machines in particular multi-punch forging machines | |
| GB2104424A (en) | Gear finishing machines | |
| US4462442A (en) | Veneer lathe hold-down rolls | |
| GB2132928A (en) | An adjustable nip mechanism | |
| US4813263A (en) | Forging machine | |
| GB1519247A (en) | Automatic strip feeder device particularly for dies | |
| US3215284A (en) | Workpiece distributors | |
| US5992722A (en) | Zero force roll release for high speed press feed units | |
| CA1119848A (en) | Impact press having a sleeve with a ram slidable therein | |
| US4364505A (en) | Double feed roll lift mechanism | |
| US2783593A (en) | Control mechanism for grinding belt | |
| US5755370A (en) | Press feed with infinitely variable stock material engagement spacing | |
| US3340756A (en) | Die accelerator | |
| US2547828A (en) | Braking system for intermittent feed apparatus | |
| CN212444429U (en) | Grinding equipment for manufacturing spring | |
| US5105925A (en) | Stop spindle attachment for automatic Swiss screw machines | |
| JP2847140B2 (en) | Work feed attachment and grinder | |
| US4192363A (en) | Automatic profile-copying device | |
| US3371820A (en) | Starter mechanism for thread rolling machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |